2022-05-09 03:39:43

by Martinez, Ricardo

[permalink] [raw]
Subject: [PATCH net-next v7 00/14] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem

t7xx is the PCIe host device driver for Intel 5G 5000 M.2 solution which
is based on MediaTek's T700 modem to provide WWAN connectivity.
The driver uses the WWAN framework infrastructure to create the following
control ports and network interfaces:
* /dev/wwan0mbim0 - Interface conforming to the MBIM protocol.
Applications like libmbim [1] or Modem Manager [2] from v1.16 onwards
with [3][4] can use it to enable data communication towards WWAN.
* /dev/wwan0at0 - Interface that supports AT commands.
* wwan0 - Primary network interface for IP traffic.

The main blocks in t7xx driver are:
* PCIe layer - Implements probe, removal, and power management callbacks.
* Port-proxy - Provides a common interface to interact with different types
of ports such as WWAN ports.
* Modem control & status monitor - Implements the entry point for modem
initialization, reset and exit, as well as exception handling.
* CLDMA (Control Layer DMA) - Manages the HW used by the port layer to send
control messages to the modem using MediaTek's CCCI (Cross-Core
Communication Interface) protocol.
* DPMAIF (Data Plane Modem AP Interface) - Controls the HW that provides
uplink and downlink queues for the data path. The data exchange takes
place using circular buffers to share data buffer addresses and metadata
to describe the packets.
* MHCCIF (Modem Host Cross-Core Interface) - Provides interrupt channels
for bidirectional event notification such as handshake, exception, PM and
port enumeration.

The compilation of the t7xx driver is enabled by the CONFIG_MTK_T7XX config
option which depends on CONFIG_WWAN.
This driver was originally developed by MediaTek. Intel adapted t7xx to
the WWAN framework, optimized and refactored the driver source code in close
collaboration with MediaTek. This will enable getting the t7xx driver on the
Approved Vendor List for interested OEM's and ODM's productization plans
with Intel 5G 5000 M.2 solution.

List of contributors:
Amir Hanania <[email protected]>
Andriy Shevchenko <[email protected]>
Chandrashekar Devegowda <[email protected]>
Dinesh Sharma <[email protected]>
Eliot Lee <[email protected]>
Haijun Liu <[email protected]>
M Chetan Kumar <[email protected]>
Mika Westerberg <[email protected]>
Moises Veleta <[email protected]>
Pierre-louis Bossart <[email protected]>
Chiranjeevi Rapolu <[email protected]>
Ricardo Martinez <[email protected]>
Madhusmita Sahu <[email protected]>
Muralidharan Sethuraman <[email protected]>
Soumya Prakash Mishra <[email protected]>
Sreehari Kancharla <[email protected]>
Suresh Nagaraj <[email protected]>

[1] https://www.freedesktop.org/software/libmbim/
[2] https://www.freedesktop.org/software/ModemManager/
[3] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/582
[4] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/523

V7:
- Delete unused macros.
- Avoid duplicated calls to le32_to_cpu().
- Fix 'out of bounds' compilation error.
- Rename port_number to port_count.
- Remove '!!' when the destination variable is a boolean.
- Remove unneeded spinlock around rx_length_th.
- Remove common field from union inside dpmaif_drb struct.
- Use 'goto' for the exit flow in t7xx_pci_enable_sleep().
- Merge CLDMA tgpd and rgpd structs.
- Add comments to clarify skb consumption by ports.
- Introduce skb_data_area_size() helper.
- Declare the port config array as constant.
- Update CLDMA_JUMBO_BUFF_SZ definition when ccci_header
is introduced by port-proxy patch.
- Update Reviewed-by tags.
- Simplify t7xx_dpmaif_tx_send_skb() and make t7xx_dpmaif_add_skb_to_ring()
report the tx queue full state early.

V6:
- Remove unneeded initializations and bit masks.
- Remove t7xx_common.h file.
- Add comment to circular linking in GPD list.
- Use min instead of min_t.
- Use int for local indexes instead of short or char.
- Update the commit message in CLDMA patch about dependencies on core patch.
- Add space between contributor name and email address.
- Rename registers with double negatives
e.g. DIS_ASPM_LOWPWR_CLR_0 -> ENABLE_ASPM_LOWPWR.
- Fix a race condition in pci sleep resource locking.
- Initialize interrupts with t7xx_pcie_mac_set_int() instead of 'clear'.
- Remove duplicate spin_lock_init(&md->exp_lock).
- Remove .ndo_select_queue callback due to singular TX queue.
- Remove call to deprecated netif_rx_any_context().
- Fix include guard name in t7xx_hif_dpmaif.h.
- Remove unused q_num parameter in DPMAIF functions.
- Do not serialize the drb_wr_idx write in t7xx_dpmaif_add_skb_to_ring()
and the read from t7xx_txq_drb_wr_available().
- Fix potential leak in t7xx_dpmaif_add_skb_to_ring().
- Unionize:
DRB structs: msg and pd.
PIT structs: msg and pd.
- Replace list_head & spinlock with skb_buff_head in dpmaif_tx_queue.
- Remove rx_length_th check in TX WWAN port flow.
- Remove wwan_remove_port() from the critical section in WWAN port uninit.
- Use skb_end_pointer() to avoid conditional compilation.
- Simplify the loop in t7xx_port_ctrl_tx() by checking the buffer offset
instead of calculating the number of required packets.
- Remove the code for unused channel PORT_CH_STATUS_RX.
- Remove bit flags from ports. Ports can check chan_enable instead of the
PORT_F_RX_ALLOW_DROP flag.
- Use INVALID_SEQ_NUM to identify the first seq number.
- Rename port_static to port_conf and ports_private to ports.
- Implement t7xx_port_send_skb() and t7xx_port_send_ctl_skb() in a layered
approach to reduce duplicated code and simplify the CCCI header handling.
- Move wwan_port_rx() call from port-proxy to WWAN port.
- Rename t7xx_port_recv_skb() to t7xx_port_enqueue_skb().
- Move control message parsing logic from port-proxy to control port,
preserve the endianness when parsing the message and make port-proxy
export a function to enable/disable ports.
- Use flexible arrays for:
port-proxy ports.
payload data in t7xx_fsm_event, port_msg, and mtk_runtime_feature.

v5:
- Update Intel's copyright years to 2021-2022.
- Remove circular dependency between DPMAIF HW (07) and HIF (08).
- Keep separate patches for CLDMA (02) and Core (03)
but improve the code split by decoupling CLDMA from
modem ops and cleaning up t7xx_common.h.
- Rename ID_CLDMA0/ID_CLDMA1 to CLDMA_ID_AP/CLDMA_ID_MD.
- Consistently use CLDMA's ring_lock to protect tr_ring.
- Free resources first and then print messages.
- Implement suggested name changes.
- Do not explicitly include dev_printk.h.
- Remove redundant dev_err()s.
- Fix possible memory leak during probe.
- Remove infrastructure for legacy interrupts.
- Remove unused macros and variables, including those that
can be replaced with constants.
- Remove PCIE_MAC_MSIX_MSK_SET macro which is duplicated code.
- Refactor __t7xx_pci_pm_suspend() for clarity.
- Refactor t7xx_cldma_rx_ring_init() and t7xx_cldma_tx_ring_init().
- Do not use & for function callbacks.
- Declare a structure to access skb->cb[] data.
- Use skb_put_data instead of memcpy.
- No need to use kfree_sensitive.
- Use dev_kfree_skb() instead of kfree_skb().
- Refactor t7xx_prepare_device_rt_data() to remove potential leaks,
avoid unneeded memset and keep rt_data and packet_size updates
inside the same 'if' block.
- Set port's rx_length_th back to 0 during uninit.
- Remove unneeded 'blocking' parameter from t7xx_cldma_send_skb().
- Return -EIO in t7xx_cldma_send_skb() if the queue is inactive.
- Refactor t7xx_cldma_qs_are_active() to use pci_device_is_present().
- Simplify t7xx_cldma_stop_q() and rename it to t7xx_cldma_stop_all_qs().
- Fix potential leaks in t7xx_cldma_init().
- Improve error handling in fsm_append_event and fsm_routine_starting().
- Propagate return codes from fsm_append_cmd() and t7xx_fsm_append_event().
- Refactor fsm_wait_for_event() to avoid unnecessary sleep.
- Create the WWAN ports and net device only after the modem is in
the ready state.
- Refactor t7xx_port_proxy_recv_skb() and port_recv_skb().
- Rename t7xx_port_check_rx_seq_num() as t7xx_port_next_rx_seq_num()
and fix the seq_num logic to handle overflows.
- Declare seq_nums as u16 instead of short.
- Use unsigned int for local indexes.
- Use min_t instead of the ternary operator.
- Refactor the loop in t7xx_dpmaif_rx_data_collect() to avoid a dead
condition check.
- Use a bitmap (bat_bitmap) instead of an array to keep track of
the DRB status. Used in t7xx_dpmaif_avail_pkt_bat_cnt().
- Refactor t7xx_dpmaif_tx_send_skb() to protect tx_submit_skb_cnt
with spinlock and remove the misleading tx_drb_available variable.
- Consolidate bit operations before endianness conversion.
- Use C bit fields in dpmaif_drb_skb struct which is not HW related.
- Add back the que_started check in t7xx_select_tx_queue().
- Create a helper function to get the DRB count.
- Simplify the use of 'usage' during t7xx_ccmni_close().
- Enforce CCMNI MTU selection with BUILD_BUG_ON() instead of a comment.
- Remove t7xx_ccmni_ctrl->capability parameter which remains constant.

v4:
- Implement list_prev_entry_circular() and list_next_entry_circular() macros.
- Remove inline from all c files.
- Define ioread32_poll_timeout_atomic() helper macro.
- Fix return code for WWAN port tx op.
- Allow AT commands fragmentation same as MBIM commands.
- Introduce t7xx_common.h file in the first patch.
- Rename functions and variables as suggested in v3.
- Reduce code duplication by creating fsm_wait_for_event() helper function.
- Remove unneeded dev_err in t7xx_fsm_clr_event().
- Remove unused variable last_state from struct t7xx_fsm_ctl.
- Remove unused variable txq_select_times from struct dpmaif_ctrl.
- Replace ETXTBSY with EBUSY.
- Refactor t7xx_dpmaif_rx_buf_alloc() to remove an unneeded allocation.
- Fix potential leak at t7xx_dpmaif_rx_frag_alloc().
- Simplify return value handling at t7xx_dpmaif_rx_start().
- Add a helper to handle the common part of CCCI header initialization.
- Make sure interrupts are enabled during PM resume.
- Add a parameter to t7xx_fsm_append_cmd() to tell if it is in interrupt context.

v3:
- Avoid unneeded ping-pong changes between patches.
- Use t7xx_ prefix in functions.
- Use t7xx_ prefix in generic structs where mtk_ or ccci prefix was used.
- Update Authors/Contributors header.
- Remove skb pools used for control path.
- Remove skb pools used for RX data path.
- Do not use dedicated TX queue for ACK-only packets.
- Remove __packed attribute from GPD structs.
- Remove the infrastructure for test and debug ports.
- Use the skb control buffer to store metadata.
- Get the IP packet type from RX PIT.
- Merge variable declaration and simple assignments.
- Use preferred coding patterns.
- Remove global variables.
- Declare HW facing structure members as little endian.
- Rename goto tags to describe what is going to be done.
- Do not use variable length arrays.
- Remove unneeded blank lines source code and kdoc headers.
- Use C99 initialization format for port-proxy ports.
- Clean up comments.
- Review included headers.
- Better use of 100 column limit.
- Remove unneeded mb() in CLDMA.
- Remove unneeded spin locks and atomics.
- Handle read_poll_timeout error.
- Use dev_err_ratelimited() where required.
- Fix resource leak when requesting IRQs.
- Use generic DEFAULT_TX_QUEUE_LEN instead custom macro.
- Use ETH_DATA_LEN instead of defining WWAN_DEFAULT_MTU.
- Use sizeof() instead of defines when the size of structures is required.
- Remove unneeded code from netdev:
No need to configure HW address length
No need to implement .ndo_change_mtu
Remove random address generation
- Code simplifications by using kernel provided functions and macros such as:
module_pci_driver
PTR_ERR_OR_ZERO
for_each_set_bit
pci_device_is_present
skb_queue_purge
list_prev_entry
__ffs64

v2:
- Replace pdev->driver->name with dev_driver_string(&pdev->dev).
- Replace random_ether_addr() with eth_random_addr().
- Update kernel-doc comment for enum data_policy.
- Indicate the driver is 'Supported' instead of 'Maintained'.
- Fix the Signed-of-by and Co-developed-by tags in the patches.
- Added authors and contributors in the top comment of the src files.

Ricardo Martinez (14):
list: Add list_next_entry_circular() and list_prev_entry_circular()
net: skb: introduce skb_data_area_size()
net: wwan: t7xx: Add control DMA interface
net: wwan: t7xx: Add core components
net: wwan: t7xx: Add port proxy infrastructure
net: wwan: t7xx: Add control port
net: wwan: t7xx: Add AT and MBIM WWAN ports
net: wwan: t7xx: Data path HW layer
net: wwan: t7xx: Add data path interface
net: wwan: t7xx: Add WWAN network interface
net: wwan: t7xx: Introduce power management
net: wwan: t7xx: Runtime PM
net: wwan: t7xx: Device deep sleep lock/unlock
net: wwan: t7xx: Add maintainers and documentation

.../networking/device_drivers/wwan/index.rst | 1 +
.../networking/device_drivers/wwan/t7xx.rst | 120 ++
MAINTAINERS | 11 +
drivers/net/wwan/Kconfig | 14 +
drivers/net/wwan/Makefile | 1 +
drivers/net/wwan/t7xx/Makefile | 20 +
drivers/net/wwan/t7xx/t7xx_cldma.c | 281 ++++
drivers/net/wwan/t7xx/t7xx_cldma.h | 180 +++
drivers/net/wwan/t7xx/t7xx_dpmaif.c | 1283 ++++++++++++++++
drivers/net/wwan/t7xx/t7xx_dpmaif.h | 179 +++
drivers/net/wwan/t7xx/t7xx_hif_cldma.c | 1340 +++++++++++++++++
drivers/net/wwan/t7xx/t7xx_hif_cldma.h | 127 ++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c | 574 +++++++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h | 206 +++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.c | 1245 +++++++++++++++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.h | 116 ++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c | 683 +++++++++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.h | 78 +
drivers/net/wwan/t7xx/t7xx_mhccif.c | 122 ++
drivers/net/wwan/t7xx/t7xx_mhccif.h | 37 +
drivers/net/wwan/t7xx/t7xx_modem_ops.c | 727 +++++++++
drivers/net/wwan/t7xx/t7xx_modem_ops.h | 88 ++
drivers/net/wwan/t7xx/t7xx_netdev.c | 423 ++++++
drivers/net/wwan/t7xx/t7xx_netdev.h | 55 +
drivers/net/wwan/t7xx/t7xx_pci.c | 761 ++++++++++
drivers/net/wwan/t7xx/t7xx_pci.h | 120 ++
drivers/net/wwan/t7xx/t7xx_pcie_mac.c | 262 ++++
drivers/net/wwan/t7xx/t7xx_pcie_mac.h | 31 +
drivers/net/wwan/t7xx/t7xx_port.h | 135 ++
drivers/net/wwan/t7xx/t7xx_port_ctrl_msg.c | 273 ++++
drivers/net/wwan/t7xx/t7xx_port_proxy.c | 512 +++++++
drivers/net/wwan/t7xx/t7xx_port_proxy.h | 98 ++
drivers/net/wwan/t7xx/t7xx_port_wwan.c | 176 +++
drivers/net/wwan/t7xx/t7xx_reg.h | 350 +++++
drivers/net/wwan/t7xx/t7xx_state_monitor.c | 550 +++++++
drivers/net/wwan/t7xx/t7xx_state_monitor.h | 135 ++
include/linux/list.h | 26 +
include/linux/skbuff.h | 5 +
38 files changed, 11345 insertions(+)
create mode 100644 Documentation/networking/device_drivers/wwan/t7xx.rst
create mode 100644 drivers/net/wwan/t7xx/Makefile
create mode 100644 drivers/net/wwan/t7xx/t7xx_cldma.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_cldma.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_dpmaif.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_dpmaif.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_cldma.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_cldma.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_mhccif.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_mhccif.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_modem_ops.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_modem_ops.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_netdev.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_netdev.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_pci.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_pci.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_pcie_mac.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_pcie_mac.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_port.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_port_ctrl_msg.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_port_proxy.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_port_proxy.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_port_wwan.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_reg.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_state_monitor.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_state_monitor.h

--
2.25.1



2022-05-09 06:04:37

by Martinez, Ricardo

[permalink] [raw]
Subject: [PATCH net-next v7 10/14] net: wwan: t7xx: Add WWAN network interface

From: Haijun Liu <[email protected]>

Creates the Cross Core Modem Network Interface (CCMNI) which implements
the wwan_ops for registration with the WWAN framework, CCMNI also
implements the net_device_ops functions used by the network device.
Network device operations include open, close, start transmission, TX
timeout and change MTU.

Signed-off-by: Haijun Liu <[email protected]>
Co-developed-by: Chandrashekar Devegowda <[email protected]>
Signed-off-by: Chandrashekar Devegowda <[email protected]>
Co-developed-by: Ricardo Martinez <[email protected]>
Signed-off-by: Ricardo Martinez <[email protected]>
Reviewed-by: Loic Poulain <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
---
drivers/net/wwan/t7xx/Makefile | 1 +
drivers/net/wwan/t7xx/t7xx_modem_ops.c | 11 +-
drivers/net/wwan/t7xx/t7xx_netdev.c | 423 +++++++++++++++++++++++++
drivers/net/wwan/t7xx/t7xx_netdev.h | 55 ++++
4 files changed, 489 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/wwan/t7xx/t7xx_netdev.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_netdev.h

diff --git a/drivers/net/wwan/t7xx/Makefile b/drivers/net/wwan/t7xx/Makefile
index 04a9ba50dc14..dc6a7d682c15 100644
--- a/drivers/net/wwan/t7xx/Makefile
+++ b/drivers/net/wwan/t7xx/Makefile
@@ -17,3 +17,4 @@ mtk_t7xx-y:= t7xx_pci.o \
t7xx_hif_dpmaif_tx.o \
t7xx_hif_dpmaif_rx.o \
t7xx_dpmaif.o \
+ t7xx_netdev.o
diff --git a/drivers/net/wwan/t7xx/t7xx_modem_ops.c b/drivers/net/wwan/t7xx/t7xx_modem_ops.c
index a1b60173d89d..1056ad9bf34f 100644
--- a/drivers/net/wwan/t7xx/t7xx_modem_ops.c
+++ b/drivers/net/wwan/t7xx/t7xx_modem_ops.c
@@ -35,6 +35,7 @@
#include "t7xx_hif_cldma.h"
#include "t7xx_mhccif.h"
#include "t7xx_modem_ops.h"
+#include "t7xx_netdev.h"
#include "t7xx_pci.h"
#include "t7xx_pcie_mac.h"
#include "t7xx_port.h"
@@ -670,10 +671,14 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
if (ret)
goto err_destroy_hswq;

- ret = t7xx_cldma_init(md->md_ctrl[CLDMA_ID_MD]);
+ ret = t7xx_ccmni_init(t7xx_dev);
if (ret)
goto err_uninit_fsm;

+ ret = t7xx_cldma_init(md->md_ctrl[CLDMA_ID_MD]);
+ if (ret)
+ goto err_uninit_ccmni;
+
ret = t7xx_port_proxy_init(md);
if (ret)
goto err_uninit_md_cldma;
@@ -692,6 +697,9 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
err_uninit_md_cldma:
t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);

+err_uninit_ccmni:
+ t7xx_ccmni_exit(t7xx_dev);
+
err_uninit_fsm:
t7xx_fsm_uninit(md);

@@ -713,6 +721,7 @@ void t7xx_md_exit(struct t7xx_pci_dev *t7xx_dev)
t7xx_fsm_append_cmd(md->fsm_ctl, FSM_CMD_PRE_STOP, FSM_CMD_FLAG_WAIT_FOR_COMPLETION);
t7xx_port_proxy_uninit(md->port_prox);
t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);
+ t7xx_ccmni_exit(t7xx_dev);
t7xx_fsm_uninit(md);
destroy_workqueue(md->handshake_wq);
}
diff --git a/drivers/net/wwan/t7xx/t7xx_netdev.c b/drivers/net/wwan/t7xx/t7xx_netdev.c
new file mode 100644
index 000000000000..c6b6547f2c6f
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_netdev.c
@@ -0,0 +1,423 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Chandrashekar Devegowda <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Andy Shevchenko <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/atomic.h>
+#include <linux/device.h>
+#include <linux/gfp.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/netdev_features.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <linux/wwan.h>
+#include <net/pkt_sched.h>
+
+#include "t7xx_hif_dpmaif_rx.h"
+#include "t7xx_hif_dpmaif_tx.h"
+#include "t7xx_netdev.h"
+#include "t7xx_pci.h"
+#include "t7xx_port_proxy.h"
+#include "t7xx_state_monitor.h"
+
+#define IP_MUX_SESSION_DEFAULT 0
+
+static int t7xx_ccmni_open(struct net_device *dev)
+{
+ struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
+
+ netif_carrier_on(dev);
+ netif_tx_start_all_queues(dev);
+ atomic_inc(&ccmni->usage);
+ return 0;
+}
+
+static int t7xx_ccmni_close(struct net_device *dev)
+{
+ struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
+
+ atomic_dec(&ccmni->usage);
+ netif_carrier_off(dev);
+ netif_tx_disable(dev);
+ return 0;
+}
+
+static int t7xx_ccmni_send_packet(struct t7xx_ccmni *ccmni, struct sk_buff *skb,
+ unsigned int txq_number)
+{
+ struct t7xx_ccmni_ctrl *ctlb = ccmni->ctlb;
+ struct t7xx_skb_cb *skb_cb = T7XX_SKB_CB(skb);
+
+ skb_cb->netif_idx = ccmni->index;
+
+ if (t7xx_dpmaif_tx_send_skb(ctlb->hif_ctrl, txq_number, skb))
+ return NETDEV_TX_BUSY;
+
+ return 0;
+}
+
+static int t7xx_ccmni_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
+ int skb_len = skb->len;
+
+ /* If MTU is changed or there is no headroom, drop the packet */
+ if (skb->len > dev->mtu || skb_headroom(skb) < sizeof(struct ccci_header)) {
+ dev_kfree_skb(skb);
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+
+ if (t7xx_ccmni_send_packet(ccmni, skb, DPMAIF_TX_DEFAULT_QUEUE))
+ return NETDEV_TX_BUSY;
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb_len;
+
+ return NETDEV_TX_OK;
+}
+
+static void t7xx_ccmni_tx_timeout(struct net_device *dev, unsigned int __always_unused txqueue)
+{
+ struct t7xx_ccmni *ccmni = netdev_priv(dev);
+
+ dev->stats.tx_errors++;
+
+ if (atomic_read(&ccmni->usage) > 0)
+ netif_tx_wake_all_queues(dev);
+}
+
+static const struct net_device_ops ccmni_netdev_ops = {
+ .ndo_open = t7xx_ccmni_open,
+ .ndo_stop = t7xx_ccmni_close,
+ .ndo_start_xmit = t7xx_ccmni_start_xmit,
+ .ndo_tx_timeout = t7xx_ccmni_tx_timeout,
+};
+
+static void t7xx_ccmni_start(struct t7xx_ccmni_ctrl *ctlb)
+{
+ struct t7xx_ccmni *ccmni;
+ int i;
+
+ for (i = 0; i < ctlb->nic_dev_num; i++) {
+ ccmni = ctlb->ccmni_inst[i];
+ if (!ccmni)
+ continue;
+
+ if (atomic_read(&ccmni->usage) > 0) {
+ netif_tx_start_all_queues(ccmni->dev);
+ netif_carrier_on(ccmni->dev);
+ }
+ }
+}
+
+static void t7xx_ccmni_pre_stop(struct t7xx_ccmni_ctrl *ctlb)
+{
+ struct t7xx_ccmni *ccmni;
+ int i;
+
+ for (i = 0; i < ctlb->nic_dev_num; i++) {
+ ccmni = ctlb->ccmni_inst[i];
+ if (!ccmni)
+ continue;
+
+ if (atomic_read(&ccmni->usage) > 0)
+ netif_tx_disable(ccmni->dev);
+ }
+}
+
+static void t7xx_ccmni_post_stop(struct t7xx_ccmni_ctrl *ctlb)
+{
+ struct t7xx_ccmni *ccmni;
+ int i;
+
+ for (i = 0; i < ctlb->nic_dev_num; i++) {
+ ccmni = ctlb->ccmni_inst[i];
+ if (!ccmni)
+ continue;
+
+ if (atomic_read(&ccmni->usage) > 0)
+ netif_carrier_off(ccmni->dev);
+ }
+}
+
+static void t7xx_ccmni_wwan_setup(struct net_device *dev)
+{
+ dev->hard_header_len += sizeof(struct ccci_header);
+
+ dev->mtu = ETH_DATA_LEN;
+ dev->max_mtu = CCMNI_MTU_MAX;
+ BUILD_BUG_ON(CCMNI_MTU_MAX > DPMAIF_HW_MTU_SIZE);
+
+ dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
+ dev->watchdog_timeo = CCMNI_NETDEV_WDT_TO;
+
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+
+ dev->features = NETIF_F_VLAN_CHALLENGED;
+
+ dev->features |= NETIF_F_SG;
+ dev->hw_features |= NETIF_F_SG;
+
+ dev->features |= NETIF_F_HW_CSUM;
+ dev->hw_features |= NETIF_F_HW_CSUM;
+
+ dev->features |= NETIF_F_RXCSUM;
+ dev->hw_features |= NETIF_F_RXCSUM;
+
+ dev->needs_free_netdev = true;
+
+ dev->type = ARPHRD_NONE;
+
+ dev->netdev_ops = &ccmni_netdev_ops;
+}
+
+static int t7xx_ccmni_wwan_newlink(void *ctxt, struct net_device *dev, u32 if_id,
+ struct netlink_ext_ack *extack)
+{
+ struct t7xx_ccmni_ctrl *ctlb = ctxt;
+ struct t7xx_ccmni *ccmni;
+ int ret;
+
+ if (if_id >= ARRAY_SIZE(ctlb->ccmni_inst))
+ return -EINVAL;
+
+ ccmni = wwan_netdev_drvpriv(dev);
+ ccmni->index = if_id;
+ ccmni->ctlb = ctlb;
+ ccmni->dev = dev;
+ atomic_set(&ccmni->usage, 0);
+ ctlb->ccmni_inst[if_id] = ccmni;
+
+ ret = register_netdevice(dev);
+ if (ret)
+ return ret;
+
+ netif_device_attach(dev);
+ return 0;
+}
+
+static void t7xx_ccmni_wwan_dellink(void *ctxt, struct net_device *dev, struct list_head *head)
+{
+ struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
+ struct t7xx_ccmni_ctrl *ctlb = ctxt;
+ u8 if_id = ccmni->index;
+
+ if (if_id >= ARRAY_SIZE(ctlb->ccmni_inst))
+ return;
+
+ if (WARN_ON(ctlb->ccmni_inst[if_id] != ccmni))
+ return;
+
+ unregister_netdevice(dev);
+}
+
+static const struct wwan_ops ccmni_wwan_ops = {
+ .priv_size = sizeof(struct t7xx_ccmni),
+ .setup = t7xx_ccmni_wwan_setup,
+ .newlink = t7xx_ccmni_wwan_newlink,
+ .dellink = t7xx_ccmni_wwan_dellink,
+};
+
+static int t7xx_ccmni_register_wwan(struct t7xx_ccmni_ctrl *ctlb)
+{
+ struct device *dev = ctlb->hif_ctrl->dev;
+ int ret;
+
+ if (ctlb->wwan_is_registered)
+ return 0;
+
+ /* WWAN core will create a netdev for the default IP MUX channel */
+ ret = wwan_register_ops(dev, &ccmni_wwan_ops, ctlb, IP_MUX_SESSION_DEFAULT);
+ if (ret < 0) {
+ dev_err(dev, "Unable to register WWAN ops, %d\n", ret);
+ return ret;
+ }
+
+ ctlb->wwan_is_registered = true;
+ return 0;
+}
+
+static int t7xx_ccmni_md_state_callback(enum md_state state, void *para)
+{
+ struct t7xx_ccmni_ctrl *ctlb = para;
+ struct device *dev;
+ int ret = 0;
+
+ dev = ctlb->hif_ctrl->dev;
+ ctlb->md_sta = state;
+
+ switch (state) {
+ case MD_STATE_READY:
+ ret = t7xx_ccmni_register_wwan(ctlb);
+ if (!ret)
+ t7xx_ccmni_start(ctlb);
+ break;
+
+ case MD_STATE_EXCEPTION:
+ case MD_STATE_STOPPED:
+ t7xx_ccmni_pre_stop(ctlb);
+
+ ret = t7xx_dpmaif_md_state_callback(ctlb->hif_ctrl, state);
+ if (ret < 0)
+ dev_err(dev, "DPMAIF md state callback err, state=%d\n", state);
+
+ t7xx_ccmni_post_stop(ctlb);
+ break;
+
+ case MD_STATE_WAITING_FOR_HS1:
+ case MD_STATE_WAITING_TO_STOP:
+ ret = t7xx_dpmaif_md_state_callback(ctlb->hif_ctrl, state);
+ if (ret < 0)
+ dev_err(dev, "DPMAIF md state callback err, state=%d\n", state);
+
+ break;
+
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static void init_md_status_notifier(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
+ struct t7xx_fsm_notifier *md_status_notifier;
+
+ md_status_notifier = &ctlb->md_status_notify;
+ INIT_LIST_HEAD(&md_status_notifier->entry);
+ md_status_notifier->notifier_fn = t7xx_ccmni_md_state_callback;
+ md_status_notifier->data = ctlb;
+
+ t7xx_fsm_notifier_register(t7xx_dev->md, md_status_notifier);
+}
+
+static void t7xx_ccmni_recv_skb(struct t7xx_pci_dev *t7xx_dev, struct sk_buff *skb)
+{
+ struct t7xx_skb_cb *skb_cb;
+ struct net_device *net_dev;
+ struct t7xx_ccmni *ccmni;
+ int pkt_type, skb_len;
+ u8 netif_id;
+
+ skb_cb = T7XX_SKB_CB(skb);
+ netif_id = skb_cb->netif_idx;
+ ccmni = t7xx_dev->ccmni_ctlb->ccmni_inst[netif_id];
+ if (!ccmni) {
+ dev_kfree_skb(skb);
+ return;
+ }
+
+ net_dev = ccmni->dev;
+ skb->dev = net_dev;
+
+ pkt_type = skb_cb->rx_pkt_type;
+ if (pkt_type == PKT_TYPE_IP6)
+ skb->protocol = htons(ETH_P_IPV6);
+ else
+ skb->protocol = htons(ETH_P_IP);
+
+ skb_len = skb->len;
+ netif_rx(skb);
+ net_dev->stats.rx_packets++;
+ net_dev->stats.rx_bytes += skb_len;
+}
+
+static void t7xx_ccmni_queue_tx_irq_notify(struct t7xx_ccmni_ctrl *ctlb, int qno)
+{
+ struct t7xx_ccmni *ccmni = ctlb->ccmni_inst[0];
+ struct netdev_queue *net_queue;
+
+ if (netif_running(ccmni->dev) && atomic_read(&ccmni->usage) > 0) {
+ net_queue = netdev_get_tx_queue(ccmni->dev, qno);
+ if (netif_tx_queue_stopped(net_queue))
+ netif_tx_wake_queue(net_queue);
+ }
+}
+
+static void t7xx_ccmni_queue_tx_full_notify(struct t7xx_ccmni_ctrl *ctlb, int qno)
+{
+ struct t7xx_ccmni *ccmni = ctlb->ccmni_inst[0];
+ struct netdev_queue *net_queue;
+
+ if (atomic_read(&ccmni->usage) > 0) {
+ netdev_err(ccmni->dev, "TX queue %d is full\n", qno);
+ net_queue = netdev_get_tx_queue(ccmni->dev, qno);
+ netif_tx_stop_queue(net_queue);
+ }
+}
+
+static void t7xx_ccmni_queue_state_notify(struct t7xx_pci_dev *t7xx_dev,
+ enum dpmaif_txq_state state, int qno)
+{
+ struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
+
+ if (ctlb->md_sta != MD_STATE_READY)
+ return;
+
+ if (!ctlb->ccmni_inst[0]) {
+ dev_warn(&t7xx_dev->pdev->dev, "No netdev registered yet\n");
+ return;
+ }
+
+ if (state == DMPAIF_TXQ_STATE_IRQ)
+ t7xx_ccmni_queue_tx_irq_notify(ctlb, qno);
+ else if (state == DMPAIF_TXQ_STATE_FULL)
+ t7xx_ccmni_queue_tx_full_notify(ctlb, qno);
+}
+
+int t7xx_ccmni_init(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct device *dev = &t7xx_dev->pdev->dev;
+ struct t7xx_ccmni_ctrl *ctlb;
+
+ ctlb = devm_kzalloc(dev, sizeof(*ctlb), GFP_KERNEL);
+ if (!ctlb)
+ return -ENOMEM;
+
+ t7xx_dev->ccmni_ctlb = ctlb;
+ ctlb->t7xx_dev = t7xx_dev;
+ ctlb->callbacks.state_notify = t7xx_ccmni_queue_state_notify;
+ ctlb->callbacks.recv_skb = t7xx_ccmni_recv_skb;
+ ctlb->nic_dev_num = NIC_DEV_DEFAULT;
+
+ ctlb->hif_ctrl = t7xx_dpmaif_hif_init(t7xx_dev, &ctlb->callbacks);
+ if (!ctlb->hif_ctrl)
+ return -ENOMEM;
+
+ init_md_status_notifier(t7xx_dev);
+ return 0;
+}
+
+void t7xx_ccmni_exit(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
+
+ t7xx_fsm_notifier_unregister(t7xx_dev->md, &ctlb->md_status_notify);
+
+ if (ctlb->wwan_is_registered) {
+ wwan_unregister_ops(&t7xx_dev->pdev->dev);
+ ctlb->wwan_is_registered = false;
+ }
+
+ t7xx_dpmaif_hif_exit(ctlb->hif_ctrl);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_netdev.h b/drivers/net/wwan/t7xx/t7xx_netdev.h
new file mode 100644
index 000000000000..f5ad49ca12a7
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_netdev.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ */
+
+#ifndef __T7XX_NETDEV_H__
+#define __T7XX_NETDEV_H__
+
+#include <linux/bits.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+
+#include "t7xx_hif_dpmaif.h"
+#include "t7xx_pci.h"
+#include "t7xx_state_monitor.h"
+
+#define RXQ_NUM DPMAIF_RXQ_NUM
+#define NIC_DEV_MAX 21
+#define NIC_DEV_DEFAULT 2
+
+#define CCMNI_NETDEV_WDT_TO (1 * HZ)
+#define CCMNI_MTU_MAX 3000
+
+struct t7xx_ccmni {
+ u8 index;
+ atomic_t usage;
+ struct net_device *dev;
+ struct t7xx_ccmni_ctrl *ctlb;
+};
+
+struct t7xx_ccmni_ctrl {
+ struct t7xx_pci_dev *t7xx_dev;
+ struct dpmaif_ctrl *hif_ctrl;
+ struct t7xx_ccmni *ccmni_inst[NIC_DEV_MAX];
+ struct dpmaif_callbacks callbacks;
+ unsigned int nic_dev_num;
+ unsigned int md_sta;
+ struct t7xx_fsm_notifier md_status_notify;
+ bool wwan_is_registered;
+};
+
+int t7xx_ccmni_init(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_ccmni_exit(struct t7xx_pci_dev *t7xx_dev);
+
+#endif /* __T7XX_NETDEV_H__ */
--
2.25.1


2022-05-09 06:37:23

by Martinez, Ricardo

[permalink] [raw]
Subject: [PATCH net-next v7 04/14] net: wwan: t7xx: Add core components

From: Haijun Liu <[email protected]>

Registers the t7xx device driver with the kernel. Setup all the core
components: PCIe layer, Modem Host Cross Core Interface (MHCCIF),
modem control operations, modem state machine, and build
infrastructure.

* PCIe layer code implements driver probe and removal.
* MHCCIF provides interrupt channels to communicate events
such as handshake, PM and port enumeration.
* Modem control implements the entry point for modem init,
reset and exit.
* The modem status monitor is a state machine used by modem control
to complete initialization and stop. It is used also to propagate
exception events reported by other components.

Signed-off-by: Haijun Liu <[email protected]>
Signed-off-by: Chandrashekar Devegowda <[email protected]>
Co-developed-by: Ricardo Martinez <[email protected]>
Signed-off-by: Ricardo Martinez <[email protected]>
Reviewed-by: Loic Poulain <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
---
drivers/net/wwan/Kconfig | 14 +
drivers/net/wwan/Makefile | 1 +
drivers/net/wwan/t7xx/Makefile | 12 +
drivers/net/wwan/t7xx/t7xx_mhccif.c | 102 ++++
drivers/net/wwan/t7xx/t7xx_mhccif.h | 37 ++
drivers/net/wwan/t7xx/t7xx_modem_ops.c | 498 +++++++++++++++++++
drivers/net/wwan/t7xx/t7xx_modem_ops.h | 85 ++++
drivers/net/wwan/t7xx/t7xx_pci.c | 225 +++++++++
drivers/net/wwan/t7xx/t7xx_pci.h | 64 +++
drivers/net/wwan/t7xx/t7xx_pcie_mac.c | 262 ++++++++++
drivers/net/wwan/t7xx/t7xx_pcie_mac.h | 31 ++
drivers/net/wwan/t7xx/t7xx_reg.h | 104 ++++
drivers/net/wwan/t7xx/t7xx_state_monitor.c | 540 +++++++++++++++++++++
drivers/net/wwan/t7xx/t7xx_state_monitor.h | 133 +++++
14 files changed, 2108 insertions(+)
create mode 100644 drivers/net/wwan/t7xx/Makefile
create mode 100644 drivers/net/wwan/t7xx/t7xx_mhccif.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_mhccif.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_modem_ops.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_modem_ops.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_pci.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_pci.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_pcie_mac.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_pcie_mac.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_state_monitor.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_state_monitor.h

diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig
index 609fd4a2c865..3486ffe94ac4 100644
--- a/drivers/net/wwan/Kconfig
+++ b/drivers/net/wwan/Kconfig
@@ -105,6 +105,20 @@ config IOSM

If unsure, say N.

+config MTK_T7XX
+ tristate "MediaTek PCIe 5G WWAN modem T7xx device"
+ depends on PCI
+ help
+ Enables MediaTek PCIe based 5G WWAN modem (T7xx series) device.
+ Adapts WWAN framework and provides network interface like wwan0
+ and tty interfaces like wwan0at0 (AT protocol), wwan0mbim0
+ (MBIM protocol), etc.
+
+ To compile this driver as a module, choose M here: the module will be
+ called mtk_t7xx.
+
+ If unsure, say N.
+
endif # WWAN

endmenu
diff --git a/drivers/net/wwan/Makefile b/drivers/net/wwan/Makefile
index e722650bebea..3960c0ae2445 100644
--- a/drivers/net/wwan/Makefile
+++ b/drivers/net/wwan/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_MHI_WWAN_MBIM) += mhi_wwan_mbim.o
obj-$(CONFIG_QCOM_BAM_DMUX) += qcom_bam_dmux.o
obj-$(CONFIG_RPMSG_WWAN_CTRL) += rpmsg_wwan_ctrl.o
obj-$(CONFIG_IOSM) += iosm/
+obj-$(CONFIG_MTK_T7XX) += t7xx/
diff --git a/drivers/net/wwan/t7xx/Makefile b/drivers/net/wwan/t7xx/Makefile
new file mode 100644
index 000000000000..6a49013bc343
--- /dev/null
+++ b/drivers/net/wwan/t7xx/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+ccflags-y += -Werror
+
+obj-${CONFIG_MTK_T7XX} := mtk_t7xx.o
+mtk_t7xx-y:= t7xx_pci.o \
+ t7xx_pcie_mac.o \
+ t7xx_mhccif.o \
+ t7xx_state_monitor.o \
+ t7xx_modem_ops.o \
+ t7xx_cldma.o \
+ t7xx_hif_cldma.o \
diff --git a/drivers/net/wwan/t7xx/t7xx_mhccif.c b/drivers/net/wwan/t7xx/t7xx_mhccif.c
new file mode 100644
index 000000000000..5826e2d0b5a8
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_mhccif.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ */
+
+#include <linux/bits.h>
+#include <linux/completion.h>
+#include <linux/dev_printk.h>
+#include <linux/io.h>
+#include <linux/irqreturn.h>
+
+#include "t7xx_mhccif.h"
+#include "t7xx_modem_ops.h"
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_reg.h"
+
+static void t7xx_mhccif_clear_interrupts(struct t7xx_pci_dev *t7xx_dev, u32 mask)
+{
+ void __iomem *mhccif_pbase = t7xx_dev->base_addr.mhccif_rc_base;
+
+ /* Clear level 2 interrupt */
+ iowrite32(mask, mhccif_pbase + REG_EP2RC_SW_INT_ACK);
+ /* Ensure write is complete */
+ t7xx_mhccif_read_sw_int_sts(t7xx_dev);
+ /* Clear level 1 interrupt */
+ t7xx_pcie_mac_clear_int_status(t7xx_dev, MHCCIF_INT);
+}
+
+static irqreturn_t t7xx_mhccif_isr_thread(int irq, void *data)
+{
+ struct t7xx_pci_dev *t7xx_dev = data;
+ u32 int_status, val;
+
+ val = T7XX_L1_1_BIT(1) | T7XX_L1_2_BIT(1);
+ iowrite32(val, IREG_BASE(t7xx_dev) + DISABLE_ASPM_LOWPWR);
+
+ int_status = t7xx_mhccif_read_sw_int_sts(t7xx_dev);
+ if (int_status & D2H_SW_INT_MASK) {
+ int ret = t7xx_pci_mhccif_isr(t7xx_dev);
+
+ if (ret)
+ dev_err(&t7xx_dev->pdev->dev, "PCI MHCCIF ISR failure: %d", ret);
+ }
+
+ t7xx_mhccif_clear_interrupts(t7xx_dev, int_status);
+ t7xx_pcie_mac_set_int(t7xx_dev, MHCCIF_INT);
+ return IRQ_HANDLED;
+}
+
+u32 t7xx_mhccif_read_sw_int_sts(struct t7xx_pci_dev *t7xx_dev)
+{
+ return ioread32(t7xx_dev->base_addr.mhccif_rc_base + REG_EP2RC_SW_INT_STS);
+}
+
+void t7xx_mhccif_mask_set(struct t7xx_pci_dev *t7xx_dev, u32 val)
+{
+ iowrite32(val, t7xx_dev->base_addr.mhccif_rc_base + REG_EP2RC_SW_INT_EAP_MASK_SET);
+}
+
+void t7xx_mhccif_mask_clr(struct t7xx_pci_dev *t7xx_dev, u32 val)
+{
+ iowrite32(val, t7xx_dev->base_addr.mhccif_rc_base + REG_EP2RC_SW_INT_EAP_MASK_CLR);
+}
+
+u32 t7xx_mhccif_mask_get(struct t7xx_pci_dev *t7xx_dev)
+{
+ return ioread32(t7xx_dev->base_addr.mhccif_rc_base + REG_EP2RC_SW_INT_EAP_MASK);
+}
+
+static irqreturn_t t7xx_mhccif_isr_handler(int irq, void *data)
+{
+ return IRQ_WAKE_THREAD;
+}
+
+void t7xx_mhccif_init(struct t7xx_pci_dev *t7xx_dev)
+{
+ t7xx_dev->base_addr.mhccif_rc_base = t7xx_dev->base_addr.pcie_ext_reg_base +
+ MHCCIF_RC_DEV_BASE -
+ t7xx_dev->base_addr.pcie_dev_reg_trsl_addr;
+
+ t7xx_dev->intr_handler[MHCCIF_INT] = t7xx_mhccif_isr_handler;
+ t7xx_dev->intr_thread[MHCCIF_INT] = t7xx_mhccif_isr_thread;
+ t7xx_dev->callback_param[MHCCIF_INT] = t7xx_dev;
+}
+
+void t7xx_mhccif_h2d_swint_trigger(struct t7xx_pci_dev *t7xx_dev, u32 channel)
+{
+ void __iomem *mhccif_pbase = t7xx_dev->base_addr.mhccif_rc_base;
+
+ iowrite32(BIT(channel), mhccif_pbase + REG_RC2EP_SW_BSY);
+ iowrite32(channel, mhccif_pbase + REG_RC2EP_SW_TCHNUM);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_mhccif.h b/drivers/net/wwan/t7xx/t7xx_mhccif.h
new file mode 100644
index 000000000000..209b386bc088
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_mhccif.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ */
+
+#ifndef __T7XX_MHCCIF_H__
+#define __T7XX_MHCCIF_H__
+
+#include <linux/types.h>
+
+#include "t7xx_pci.h"
+#include "t7xx_reg.h"
+
+#define D2H_SW_INT_MASK (D2H_INT_EXCEPTION_INIT | \
+ D2H_INT_EXCEPTION_INIT_DONE | \
+ D2H_INT_EXCEPTION_CLEARQ_DONE | \
+ D2H_INT_EXCEPTION_ALLQ_RESET | \
+ D2H_INT_PORT_ENUM | \
+ D2H_INT_ASYNC_MD_HK)
+
+void t7xx_mhccif_mask_set(struct t7xx_pci_dev *t7xx_dev, u32 val);
+void t7xx_mhccif_mask_clr(struct t7xx_pci_dev *t7xx_dev, u32 val);
+u32 t7xx_mhccif_mask_get(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_mhccif_init(struct t7xx_pci_dev *t7xx_dev);
+u32 t7xx_mhccif_read_sw_int_sts(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_mhccif_h2d_swint_trigger(struct t7xx_pci_dev *t7xx_dev, u32 channel);
+
+#endif /*__T7XX_MHCCIF_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_modem_ops.c b/drivers/net/wwan/t7xx/t7xx_modem_ops.c
new file mode 100644
index 000000000000..30292e3f1c37
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_modem_ops.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+#include <linux/io.h>
+#include <linux/irqreturn.h>
+#include <linux/kthread.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_cldma.h"
+#include "t7xx_hif_cldma.h"
+#include "t7xx_mhccif.h"
+#include "t7xx_modem_ops.h"
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_reg.h"
+#include "t7xx_state_monitor.h"
+
+#define RGU_RESET_DELAY_MS 10
+#define PORT_RESET_DELAY_MS 2000
+#define EX_HS_TIMEOUT_MS 5000
+#define EX_HS_POLL_DELAY_MS 10
+
+static unsigned int t7xx_get_interrupt_status(struct t7xx_pci_dev *t7xx_dev)
+{
+ return t7xx_mhccif_read_sw_int_sts(t7xx_dev) & D2H_SW_INT_MASK;
+}
+
+/**
+ * t7xx_pci_mhccif_isr() - Process MHCCIF interrupts.
+ * @t7xx_dev: MTK device.
+ *
+ * Check the interrupt status and queue commands accordingly.
+ *
+ * Returns:
+ ** 0 - Success.
+ ** -EINVAL - Failure to get FSM control.
+ */
+int t7xx_pci_mhccif_isr(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_modem *md = t7xx_dev->md;
+ struct t7xx_fsm_ctl *ctl;
+ unsigned int int_sta;
+ int ret = 0;
+ u32 mask;
+
+ ctl = md->fsm_ctl;
+ if (!ctl) {
+ dev_err_ratelimited(&t7xx_dev->pdev->dev,
+ "MHCCIF interrupt received before initializing MD monitor\n");
+ return -EINVAL;
+ }
+
+ spin_lock_bh(&md->exp_lock);
+ int_sta = t7xx_get_interrupt_status(t7xx_dev);
+ md->exp_id |= int_sta;
+ if (md->exp_id & D2H_INT_EXCEPTION_INIT) {
+ if (ctl->md_state == MD_STATE_INVALID ||
+ ctl->md_state == MD_STATE_WAITING_FOR_HS1 ||
+ ctl->md_state == MD_STATE_WAITING_FOR_HS2 ||
+ ctl->md_state == MD_STATE_READY) {
+ md->exp_id &= ~D2H_INT_EXCEPTION_INIT;
+ ret = t7xx_fsm_recv_md_intr(ctl, MD_IRQ_CCIF_EX);
+ }
+ } else if (md->exp_id & D2H_INT_PORT_ENUM) {
+ md->exp_id &= ~D2H_INT_PORT_ENUM;
+
+ if (ctl->curr_state == FSM_STATE_INIT || ctl->curr_state == FSM_STATE_PRE_START ||
+ ctl->curr_state == FSM_STATE_STOPPED)
+ ret = t7xx_fsm_recv_md_intr(ctl, MD_IRQ_PORT_ENUM);
+ } else if (ctl->md_state == MD_STATE_WAITING_FOR_HS1) {
+ mask = t7xx_mhccif_mask_get(t7xx_dev);
+ if ((md->exp_id & D2H_INT_ASYNC_MD_HK) && !(mask & D2H_INT_ASYNC_MD_HK)) {
+ md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
+ queue_work(md->handshake_wq, &md->handshake_work);
+ }
+ }
+ spin_unlock_bh(&md->exp_lock);
+
+ return ret;
+}
+
+static void t7xx_clr_device_irq_via_pcie(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_addr_base *pbase_addr = &t7xx_dev->base_addr;
+ void __iomem *reset_pcie_reg;
+ u32 val;
+
+ reset_pcie_reg = pbase_addr->pcie_ext_reg_base + TOPRGU_CH_PCIE_IRQ_STA -
+ pbase_addr->pcie_dev_reg_trsl_addr;
+ val = ioread32(reset_pcie_reg);
+ iowrite32(val, reset_pcie_reg);
+}
+
+void t7xx_clear_rgu_irq(struct t7xx_pci_dev *t7xx_dev)
+{
+ /* Clear L2 */
+ t7xx_clr_device_irq_via_pcie(t7xx_dev);
+ /* Clear L1 */
+ t7xx_pcie_mac_clear_int_status(t7xx_dev, SAP_RGU_INT);
+}
+
+static int t7xx_acpi_reset(struct t7xx_pci_dev *t7xx_dev, char *fn_name)
+{
+#ifdef CONFIG_ACPI
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct device *dev = &t7xx_dev->pdev->dev;
+ acpi_status acpi_ret;
+ acpi_handle handle;
+
+ handle = ACPI_HANDLE(dev);
+ if (!handle) {
+ dev_err(dev, "ACPI handle not found\n");
+ return -EFAULT;
+ }
+
+ if (!acpi_has_method(handle, fn_name)) {
+ dev_err(dev, "%s method not found\n", fn_name);
+ return -EFAULT;
+ }
+
+ acpi_ret = acpi_evaluate_object(handle, fn_name, NULL, &buffer);
+ if (ACPI_FAILURE(acpi_ret)) {
+ dev_err(dev, "%s method fail: %s\n", fn_name, acpi_format_exception(acpi_ret));
+ return -EFAULT;
+ }
+
+#endif
+ return 0;
+}
+
+int t7xx_acpi_fldr_func(struct t7xx_pci_dev *t7xx_dev)
+{
+ return t7xx_acpi_reset(t7xx_dev, "_RST");
+}
+
+static void t7xx_reset_device_via_pmic(struct t7xx_pci_dev *t7xx_dev)
+{
+ u32 val;
+
+ val = ioread32(IREG_BASE(t7xx_dev) + T7XX_PCIE_MISC_DEV_STATUS);
+ if (val & MISC_RESET_TYPE_PLDR)
+ t7xx_acpi_reset(t7xx_dev, "MRST._RST");
+ else if (val & MISC_RESET_TYPE_FLDR)
+ t7xx_acpi_fldr_func(t7xx_dev);
+}
+
+static irqreturn_t t7xx_rgu_isr_thread(int irq, void *data)
+{
+ struct t7xx_pci_dev *t7xx_dev = data;
+
+ msleep(RGU_RESET_DELAY_MS);
+ t7xx_reset_device_via_pmic(t7xx_dev);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t t7xx_rgu_isr_handler(int irq, void *data)
+{
+ struct t7xx_pci_dev *t7xx_dev = data;
+ struct t7xx_modem *modem;
+
+ t7xx_clear_rgu_irq(t7xx_dev);
+ if (!t7xx_dev->rgu_pci_irq_en)
+ return IRQ_HANDLED;
+
+ modem = t7xx_dev->md;
+ modem->rgu_irq_asserted = true;
+ t7xx_pcie_mac_clear_int(t7xx_dev, SAP_RGU_INT);
+ return IRQ_WAKE_THREAD;
+}
+
+static void t7xx_pcie_register_rgu_isr(struct t7xx_pci_dev *t7xx_dev)
+{
+ /* Registers RGU callback ISR with PCIe driver */
+ t7xx_pcie_mac_clear_int(t7xx_dev, SAP_RGU_INT);
+ t7xx_pcie_mac_clear_int_status(t7xx_dev, SAP_RGU_INT);
+
+ t7xx_dev->intr_handler[SAP_RGU_INT] = t7xx_rgu_isr_handler;
+ t7xx_dev->intr_thread[SAP_RGU_INT] = t7xx_rgu_isr_thread;
+ t7xx_dev->callback_param[SAP_RGU_INT] = t7xx_dev;
+ t7xx_pcie_mac_set_int(t7xx_dev, SAP_RGU_INT);
+}
+
+/**
+ * t7xx_cldma_exception() - CLDMA exception handler.
+ * @md_ctrl: modem control struct.
+ * @stage: exception stage.
+ *
+ * Part of the modem exception recovery.
+ * Stages are one after the other as describe below:
+ * HIF_EX_INIT: Disable and clear TXQ.
+ * HIF_EX_CLEARQ_DONE: Disable RX, flush TX/RX workqueues and clear RX.
+ * HIF_EX_ALLQ_RESET: HW is back in safe mode for re-initialization and restart.
+ */
+
+/* Modem Exception Handshake Flow
+ *
+ * Modem HW Exception interrupt received
+ * (MD_IRQ_CCIF_EX)
+ * |
+ * +---------v--------+
+ * | HIF_EX_INIT | : Disable and clear TXQ
+ * +------------------+
+ * |
+ * +---------v--------+
+ * | HIF_EX_INIT_DONE | : Wait for the init to be done
+ * +------------------+
+ * |
+ * +---------v--------+
+ * |HIF_EX_CLEARQ_DONE| : Disable and clear RXQ
+ * +------------------+ : Flush TX/RX workqueues
+ * |
+ * +---------v--------+
+ * |HIF_EX_ALLQ_RESET | : Restart HW and CLDMA
+ * +------------------+
+ */
+static void t7xx_cldma_exception(struct cldma_ctrl *md_ctrl, enum hif_ex_stage stage)
+{
+ switch (stage) {
+ case HIF_EX_INIT:
+ t7xx_cldma_stop_all_qs(md_ctrl, MTK_TX);
+ t7xx_cldma_clear_all_qs(md_ctrl, MTK_TX);
+ break;
+
+ case HIF_EX_CLEARQ_DONE:
+ /* We do not want to get CLDMA IRQ when MD is
+ * resetting CLDMA after it got clearq_ack.
+ */
+ t7xx_cldma_stop_all_qs(md_ctrl, MTK_RX);
+ t7xx_cldma_stop(md_ctrl);
+
+ if (md_ctrl->hif_id == CLDMA_ID_MD)
+ t7xx_cldma_hw_reset(md_ctrl->t7xx_dev->base_addr.infracfg_ao_base);
+
+ t7xx_cldma_clear_all_qs(md_ctrl, MTK_RX);
+ break;
+
+ case HIF_EX_ALLQ_RESET:
+ t7xx_cldma_hw_init(&md_ctrl->hw_info);
+ t7xx_cldma_start(md_ctrl);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void t7xx_md_exception(struct t7xx_modem *md, enum hif_ex_stage stage)
+{
+ struct t7xx_pci_dev *t7xx_dev = md->t7xx_dev;
+
+ if (stage == HIF_EX_CLEARQ_DONE) {
+ /* Give DHL time to flush data */
+ msleep(PORT_RESET_DELAY_MS);
+ }
+
+ t7xx_cldma_exception(md->md_ctrl[CLDMA_ID_MD], stage);
+
+ if (stage == HIF_EX_INIT)
+ t7xx_mhccif_h2d_swint_trigger(t7xx_dev, H2D_CH_EXCEPTION_ACK);
+ else if (stage == HIF_EX_CLEARQ_DONE)
+ t7xx_mhccif_h2d_swint_trigger(t7xx_dev, H2D_CH_EXCEPTION_CLEARQ_ACK);
+}
+
+static int t7xx_wait_hif_ex_hk_event(struct t7xx_modem *md, int event_id)
+{
+ unsigned int waited_time_ms = 0;
+
+ do {
+ if (md->exp_id & event_id)
+ return 0;
+
+ waited_time_ms += EX_HS_POLL_DELAY_MS;
+ msleep(EX_HS_POLL_DELAY_MS);
+ } while (waited_time_ms < EX_HS_TIMEOUT_MS);
+
+ return -EFAULT;
+}
+
+static void t7xx_md_sys_sw_init(struct t7xx_pci_dev *t7xx_dev)
+{
+ /* Register the MHCCIF ISR for MD exception, port enum and
+ * async handshake notifications.
+ */
+ t7xx_mhccif_mask_set(t7xx_dev, D2H_SW_INT_MASK);
+ t7xx_mhccif_mask_clr(t7xx_dev, D2H_INT_PORT_ENUM);
+
+ /* Register RGU IRQ handler for sAP exception notification */
+ t7xx_dev->rgu_pci_irq_en = true;
+ t7xx_pcie_register_rgu_isr(t7xx_dev);
+}
+
+static void t7xx_md_hk_wq(struct work_struct *work)
+{
+ struct t7xx_modem *md = container_of(work, struct t7xx_modem, handshake_work);
+ struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
+
+ t7xx_cldma_switch_cfg(md->md_ctrl[CLDMA_ID_MD]);
+ t7xx_cldma_start(md->md_ctrl[CLDMA_ID_MD]);
+ t7xx_fsm_broadcast_state(ctl, MD_STATE_WAITING_FOR_HS2);
+ md->core_md.ready = true;
+ wake_up(&ctl->async_hk_wq);
+}
+
+void t7xx_md_event_notify(struct t7xx_modem *md, enum md_event_id evt_id)
+{
+ struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
+ void __iomem *mhccif_base;
+ unsigned int int_sta;
+ unsigned long flags;
+
+ switch (evt_id) {
+ case FSM_PRE_START:
+ t7xx_mhccif_mask_clr(md->t7xx_dev, D2H_INT_PORT_ENUM);
+ break;
+
+ case FSM_START:
+ t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_PORT_ENUM);
+
+ spin_lock_irqsave(&md->exp_lock, flags);
+ int_sta = t7xx_get_interrupt_status(md->t7xx_dev);
+ md->exp_id |= int_sta;
+ if (md->exp_id & D2H_INT_EXCEPTION_INIT) {
+ ctl->exp_flg = true;
+ md->exp_id &= ~D2H_INT_EXCEPTION_INIT;
+ md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
+ } else if (ctl->exp_flg) {
+ md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
+ } else if (md->exp_id & D2H_INT_ASYNC_MD_HK) {
+ queue_work(md->handshake_wq, &md->handshake_work);
+ md->exp_id &= ~D2H_INT_ASYNC_MD_HK;
+ mhccif_base = md->t7xx_dev->base_addr.mhccif_rc_base;
+ iowrite32(D2H_INT_ASYNC_MD_HK, mhccif_base + REG_EP2RC_SW_INT_ACK);
+ t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_ASYNC_MD_HK);
+ } else {
+ t7xx_mhccif_mask_clr(md->t7xx_dev, D2H_INT_ASYNC_MD_HK);
+ }
+ spin_unlock_irqrestore(&md->exp_lock, flags);
+
+ t7xx_mhccif_mask_clr(md->t7xx_dev,
+ D2H_INT_EXCEPTION_INIT |
+ D2H_INT_EXCEPTION_INIT_DONE |
+ D2H_INT_EXCEPTION_CLEARQ_DONE |
+ D2H_INT_EXCEPTION_ALLQ_RESET);
+ break;
+
+ case FSM_READY:
+ t7xx_mhccif_mask_set(md->t7xx_dev, D2H_INT_ASYNC_MD_HK);
+ break;
+
+ default:
+ break;
+ }
+}
+
+void t7xx_md_exception_handshake(struct t7xx_modem *md)
+{
+ struct device *dev = &md->t7xx_dev->pdev->dev;
+ int ret;
+
+ t7xx_md_exception(md, HIF_EX_INIT);
+ ret = t7xx_wait_hif_ex_hk_event(md, D2H_INT_EXCEPTION_INIT_DONE);
+ if (ret)
+ dev_err(dev, "EX CCIF HS timeout, RCH 0x%lx\n", D2H_INT_EXCEPTION_INIT_DONE);
+
+ t7xx_md_exception(md, HIF_EX_INIT_DONE);
+ ret = t7xx_wait_hif_ex_hk_event(md, D2H_INT_EXCEPTION_CLEARQ_DONE);
+ if (ret)
+ dev_err(dev, "EX CCIF HS timeout, RCH 0x%lx\n", D2H_INT_EXCEPTION_CLEARQ_DONE);
+
+ t7xx_md_exception(md, HIF_EX_CLEARQ_DONE);
+ ret = t7xx_wait_hif_ex_hk_event(md, D2H_INT_EXCEPTION_ALLQ_RESET);
+ if (ret)
+ dev_err(dev, "EX CCIF HS timeout, RCH 0x%lx\n", D2H_INT_EXCEPTION_ALLQ_RESET);
+
+ t7xx_md_exception(md, HIF_EX_ALLQ_RESET);
+}
+
+static struct t7xx_modem *t7xx_md_alloc(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct device *dev = &t7xx_dev->pdev->dev;
+ struct t7xx_modem *md;
+
+ md = devm_kzalloc(dev, sizeof(*md), GFP_KERNEL);
+ if (!md)
+ return NULL;
+
+ md->t7xx_dev = t7xx_dev;
+ t7xx_dev->md = md;
+ spin_lock_init(&md->exp_lock);
+ md->handshake_wq = alloc_workqueue("%s", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI,
+ 0, "md_hk_wq");
+ if (!md->handshake_wq)
+ return NULL;
+
+ INIT_WORK(&md->handshake_work, t7xx_md_hk_wq);
+ return md;
+}
+
+int t7xx_md_reset(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_modem *md = t7xx_dev->md;
+
+ md->md_init_finish = false;
+ md->exp_id = 0;
+ t7xx_fsm_reset(md);
+ t7xx_cldma_reset(md->md_ctrl[CLDMA_ID_MD]);
+ md->md_init_finish = true;
+ return 0;
+}
+
+/**
+ * t7xx_md_init() - Initialize modem.
+ * @t7xx_dev: MTK device.
+ *
+ * Allocate and initialize MD control block, and initialize data path.
+ * Register MHCCIF ISR and RGU ISR, and start the state machine.
+ *
+ * Return:
+ ** 0 - Success.
+ ** -ENOMEM - Allocation failure.
+ */
+int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_modem *md;
+ int ret;
+
+ md = t7xx_md_alloc(t7xx_dev);
+ if (!md)
+ return -ENOMEM;
+
+ ret = t7xx_cldma_alloc(CLDMA_ID_MD, t7xx_dev);
+ if (ret)
+ goto err_destroy_hswq;
+
+ ret = t7xx_fsm_init(md);
+ if (ret)
+ goto err_destroy_hswq;
+
+ ret = t7xx_cldma_init(md->md_ctrl[CLDMA_ID_MD]);
+ if (ret)
+ goto err_uninit_fsm;
+
+ ret = t7xx_fsm_append_cmd(md->fsm_ctl, FSM_CMD_START, 0);
+ if (ret) /* fsm_uninit flushes cmd queue */
+ goto err_uninit_md_cldma;
+
+ t7xx_md_sys_sw_init(t7xx_dev);
+ md->md_init_finish = true;
+ return 0;
+
+err_uninit_md_cldma:
+ t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);
+
+err_uninit_fsm:
+ t7xx_fsm_uninit(md);
+
+err_destroy_hswq:
+ destroy_workqueue(md->handshake_wq);
+ dev_err(&t7xx_dev->pdev->dev, "Modem init failed\n");
+ return ret;
+}
+
+void t7xx_md_exit(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_modem *md = t7xx_dev->md;
+
+ t7xx_pcie_mac_clear_int(t7xx_dev, SAP_RGU_INT);
+
+ if (!md->md_init_finish)
+ return;
+
+ t7xx_fsm_append_cmd(md->fsm_ctl, FSM_CMD_PRE_STOP, FSM_CMD_FLAG_WAIT_FOR_COMPLETION);
+ t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);
+ t7xx_fsm_uninit(md);
+ destroy_workqueue(md->handshake_wq);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_modem_ops.h b/drivers/net/wwan/t7xx/t7xx_modem_ops.h
new file mode 100644
index 000000000000..1fc286fa1a14
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_modem_ops.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_MODEM_OPS_H__
+#define __T7XX_MODEM_OPS_H__
+
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_hif_cldma.h"
+#include "t7xx_pci.h"
+
+#define FEATURE_COUNT 64
+
+/**
+ * enum hif_ex_stage - HIF exception handshake stages with the HW.
+ * @HIF_EX_INIT: Disable and clear TXQ.
+ * @HIF_EX_INIT_DONE: Polling for initialization to be done.
+ * @HIF_EX_CLEARQ_DONE: Disable RX, flush TX/RX workqueues and clear RX.
+ * @HIF_EX_ALLQ_RESET: HW is back in safe mode for re-initialization and restart.
+ */
+enum hif_ex_stage {
+ HIF_EX_INIT,
+ HIF_EX_INIT_DONE,
+ HIF_EX_CLEARQ_DONE,
+ HIF_EX_ALLQ_RESET,
+};
+
+struct mtk_runtime_feature {
+ u8 feature_id;
+ u8 support_info;
+ u8 reserved[2];
+ __le32 data_len;
+ __le32 data[];
+};
+
+enum md_event_id {
+ FSM_PRE_START,
+ FSM_START,
+ FSM_READY,
+};
+
+struct t7xx_sys_info {
+ bool ready;
+};
+
+struct t7xx_modem {
+ struct cldma_ctrl *md_ctrl[CLDMA_NUM];
+ struct t7xx_pci_dev *t7xx_dev;
+ struct t7xx_sys_info core_md;
+ bool md_init_finish;
+ bool rgu_irq_asserted;
+ struct workqueue_struct *handshake_wq;
+ struct work_struct handshake_work;
+ struct t7xx_fsm_ctl *fsm_ctl;
+ struct port_proxy *port_prox;
+ unsigned int exp_id;
+ spinlock_t exp_lock; /* Protects exception events */
+};
+
+void t7xx_md_exception_handshake(struct t7xx_modem *md);
+void t7xx_md_event_notify(struct t7xx_modem *md, enum md_event_id evt_id);
+int t7xx_md_reset(struct t7xx_pci_dev *t7xx_dev);
+int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_md_exit(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_clear_rgu_irq(struct t7xx_pci_dev *t7xx_dev);
+int t7xx_acpi_fldr_func(struct t7xx_pci_dev *t7xx_dev);
+int t7xx_pci_mhccif_isr(struct t7xx_pci_dev *t7xx_dev);
+
+#endif /* __T7XX_MODEM_OPS_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_pci.c b/drivers/net/wwan/t7xx/t7xx_pci.c
new file mode 100644
index 000000000000..8beb32a4185d
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_pci.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Andy Shevchenko <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ */
+
+#include <linux/atomic.h>
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/gfp.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "t7xx_mhccif.h"
+#include "t7xx_modem_ops.h"
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_reg.h"
+
+#define T7XX_PCI_IREG_BASE 0
+#define T7XX_PCI_EREG_BASE 2
+
+static int t7xx_request_irq(struct pci_dev *pdev)
+{
+ struct t7xx_pci_dev *t7xx_dev;
+ int ret, i;
+
+ t7xx_dev = pci_get_drvdata(pdev);
+
+ for (i = 0; i < EXT_INT_NUM; i++) {
+ const char *irq_descr;
+ int irq_vec;
+
+ if (!t7xx_dev->intr_handler[i])
+ continue;
+
+ irq_descr = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%d",
+ dev_driver_string(&pdev->dev), i);
+ if (!irq_descr) {
+ ret = -ENOMEM;
+ break;
+ }
+
+ irq_vec = pci_irq_vector(pdev, i);
+ ret = request_threaded_irq(irq_vec, t7xx_dev->intr_handler[i],
+ t7xx_dev->intr_thread[i], 0, irq_descr,
+ t7xx_dev->callback_param[i]);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request IRQ: %d\n", ret);
+ break;
+ }
+ }
+
+ if (ret) {
+ while (i--) {
+ if (!t7xx_dev->intr_handler[i])
+ continue;
+
+ free_irq(pci_irq_vector(pdev, i), t7xx_dev->callback_param[i]);
+ }
+ }
+
+ return ret;
+}
+
+static int t7xx_setup_msix(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct pci_dev *pdev = t7xx_dev->pdev;
+ int ret;
+
+ /* Only using 6 interrupts, but HW-design requires power-of-2 IRQs allocation */
+ ret = pci_alloc_irq_vectors(pdev, EXT_INT_NUM, EXT_INT_NUM, PCI_IRQ_MSIX);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to allocate MSI-X entry: %d\n", ret);
+ return ret;
+ }
+
+ ret = t7xx_request_irq(pdev);
+ if (ret) {
+ pci_free_irq_vectors(pdev);
+ return ret;
+ }
+
+ t7xx_pcie_set_mac_msix_cfg(t7xx_dev, EXT_INT_NUM);
+ return 0;
+}
+
+static int t7xx_interrupt_init(struct t7xx_pci_dev *t7xx_dev)
+{
+ int ret, i;
+
+ if (!t7xx_dev->pdev->msix_cap)
+ return -EINVAL;
+
+ ret = t7xx_setup_msix(t7xx_dev);
+ if (ret)
+ return ret;
+
+ /* IPs enable interrupts when ready */
+ for (i = 0; i < EXT_INT_NUM; i++)
+ t7xx_pcie_mac_set_int(t7xx_dev, i);
+
+ return 0;
+}
+
+static void t7xx_pci_infracfg_ao_calc(struct t7xx_pci_dev *t7xx_dev)
+{
+ t7xx_dev->base_addr.infracfg_ao_base = t7xx_dev->base_addr.pcie_ext_reg_base +
+ INFRACFG_AO_DEV_CHIP -
+ t7xx_dev->base_addr.pcie_dev_reg_trsl_addr;
+}
+
+static int t7xx_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct t7xx_pci_dev *t7xx_dev;
+ int ret;
+
+ t7xx_dev = devm_kzalloc(&pdev->dev, sizeof(*t7xx_dev), GFP_KERNEL);
+ if (!t7xx_dev)
+ return -ENOMEM;
+
+ pci_set_drvdata(pdev, t7xx_dev);
+ t7xx_dev->pdev = pdev;
+
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ pci_set_master(pdev);
+
+ ret = pcim_iomap_regions(pdev, BIT(T7XX_PCI_IREG_BASE) | BIT(T7XX_PCI_EREG_BASE),
+ pci_name(pdev));
+ if (ret) {
+ dev_err(&pdev->dev, "Could not request BARs: %d\n", ret);
+ return -ENOMEM;
+ }
+
+ ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+ if (ret) {
+ dev_err(&pdev->dev, "Could not set PCI DMA mask: %d\n", ret);
+ return ret;
+ }
+
+ ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
+ if (ret) {
+ dev_err(&pdev->dev, "Could not set consistent PCI DMA mask: %d\n", ret);
+ return ret;
+ }
+
+ IREG_BASE(t7xx_dev) = pcim_iomap_table(pdev)[T7XX_PCI_IREG_BASE];
+ t7xx_dev->base_addr.pcie_ext_reg_base = pcim_iomap_table(pdev)[T7XX_PCI_EREG_BASE];
+
+ t7xx_pcie_mac_atr_init(t7xx_dev);
+ t7xx_pci_infracfg_ao_calc(t7xx_dev);
+ t7xx_mhccif_init(t7xx_dev);
+
+ ret = t7xx_md_init(t7xx_dev);
+ if (ret)
+ return ret;
+
+ t7xx_pcie_mac_interrupts_dis(t7xx_dev);
+
+ ret = t7xx_interrupt_init(t7xx_dev);
+ if (ret) {
+ t7xx_md_exit(t7xx_dev);
+ return ret;
+ }
+
+ t7xx_pcie_mac_set_int(t7xx_dev, MHCCIF_INT);
+ t7xx_pcie_mac_interrupts_en(t7xx_dev);
+
+ return 0;
+}
+
+static void t7xx_pci_remove(struct pci_dev *pdev)
+{
+ struct t7xx_pci_dev *t7xx_dev;
+ int i;
+
+ t7xx_dev = pci_get_drvdata(pdev);
+ t7xx_md_exit(t7xx_dev);
+
+ for (i = 0; i < EXT_INT_NUM; i++) {
+ if (!t7xx_dev->intr_handler[i])
+ continue;
+
+ free_irq(pci_irq_vector(pdev, i), t7xx_dev->callback_param[i]);
+ }
+
+ pci_free_irq_vectors(t7xx_dev->pdev);
+}
+
+static const struct pci_device_id t7xx_pci_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_MEDIATEK, 0x4d75) },
+ { }
+};
+MODULE_DEVICE_TABLE(pci, t7xx_pci_table);
+
+static struct pci_driver t7xx_pci_driver = {
+ .name = "mtk_t7xx",
+ .id_table = t7xx_pci_table,
+ .probe = t7xx_pci_probe,
+ .remove = t7xx_pci_remove,
+};
+
+module_pci_driver(t7xx_pci_driver);
+
+MODULE_AUTHOR("MediaTek Inc");
+MODULE_DESCRIPTION("MediaTek PCIe 5G WWAN modem T7xx driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/wwan/t7xx/t7xx_pci.h b/drivers/net/wwan/t7xx/t7xx_pci.h
new file mode 100644
index 000000000000..dfd4a2f2095b
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_pci.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Moises Veleta <[email protected]>
+ */
+
+#ifndef __T7XX_PCI_H__
+#define __T7XX_PCI_H__
+
+#include <linux/irqreturn.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+
+#include "t7xx_reg.h"
+
+/* struct t7xx_addr_base - holds base addresses
+ * @pcie_mac_ireg_base: PCIe MAC register base
+ * @pcie_ext_reg_base: used to calculate base addresses for CLDMA, DPMA and MHCCIF registers
+ * @pcie_dev_reg_trsl_addr: used to calculate the register base address
+ * @infracfg_ao_base: base address used in CLDMA reset operations
+ * @mhccif_rc_base: host view of MHCCIF rc base addr
+ */
+struct t7xx_addr_base {
+ void __iomem *pcie_mac_ireg_base;
+ void __iomem *pcie_ext_reg_base;
+ u32 pcie_dev_reg_trsl_addr;
+ void __iomem *infracfg_ao_base;
+ void __iomem *mhccif_rc_base;
+};
+
+typedef irqreturn_t (*t7xx_intr_callback)(int irq, void *param);
+
+/* struct t7xx_pci_dev - MTK device context structure
+ * @intr_handler: array of handler function for request_threaded_irq
+ * @intr_thread: array of thread_fn for request_threaded_irq
+ * @callback_param: array of cookie passed back to interrupt functions
+ * @pdev: PCI device
+ * @base_addr: memory base addresses of HW components
+ * @md: modem interface
+ * @ccmni_ctlb: context structure used to control the network data path
+ * @rgu_pci_irq_en: RGU callback ISR registered and active
+ */
+struct t7xx_pci_dev {
+ t7xx_intr_callback intr_handler[EXT_INT_NUM];
+ t7xx_intr_callback intr_thread[EXT_INT_NUM];
+ void *callback_param[EXT_INT_NUM];
+ struct pci_dev *pdev;
+ struct t7xx_addr_base base_addr;
+ struct t7xx_modem *md;
+ struct t7xx_ccmni_ctrl *ccmni_ctlb;
+ bool rgu_pci_irq_en;
+};
+
+#endif /* __T7XX_PCI_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_pcie_mac.c b/drivers/net/wwan/t7xx/t7xx_pcie_mac.c
new file mode 100644
index 000000000000..76da4c15e3de
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_pcie_mac.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ */
+
+#include <linux/bits.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_reg.h"
+
+#define T7XX_PCIE_REG_BAR 2
+#define T7XX_PCIE_REG_PORT ATR_SRC_PCI_WIN0
+#define T7XX_PCIE_REG_TABLE_NUM 0
+#define T7XX_PCIE_REG_TRSL_PORT ATR_DST_AXIM_0
+
+#define T7XX_PCIE_DEV_DMA_PORT_START ATR_SRC_AXIS_0
+#define T7XX_PCIE_DEV_DMA_PORT_END ATR_SRC_AXIS_2
+#define T7XX_PCIE_DEV_DMA_TABLE_NUM 0
+#define T7XX_PCIE_DEV_DMA_TRSL_ADDR 0
+#define T7XX_PCIE_DEV_DMA_SRC_ADDR 0
+#define T7XX_PCIE_DEV_DMA_TRANSPARENT 1
+#define T7XX_PCIE_DEV_DMA_SIZE 0
+
+enum t7xx_atr_src_port {
+ ATR_SRC_PCI_WIN0,
+ ATR_SRC_PCI_WIN1,
+ ATR_SRC_AXIS_0,
+ ATR_SRC_AXIS_1,
+ ATR_SRC_AXIS_2,
+ ATR_SRC_AXIS_3,
+};
+
+enum t7xx_atr_dst_port {
+ ATR_DST_PCI_TRX,
+ ATR_DST_PCI_CONFIG,
+ ATR_DST_AXIM_0 = 4,
+ ATR_DST_AXIM_1,
+ ATR_DST_AXIM_2,
+ ATR_DST_AXIM_3,
+};
+
+struct t7xx_atr_config {
+ u64 src_addr;
+ u64 trsl_addr;
+ u64 size;
+ u32 port;
+ u32 table;
+ enum t7xx_atr_dst_port trsl_id;
+ u32 transparent;
+};
+
+static void t7xx_pcie_mac_atr_tables_dis(void __iomem *pbase, enum t7xx_atr_src_port port)
+{
+ void __iomem *reg;
+ int i, offset;
+
+ for (i = 0; i < ATR_TABLE_NUM_PER_ATR; i++) {
+ offset = ATR_PORT_OFFSET * port + ATR_TABLE_OFFSET * i;
+ reg = pbase + ATR_PCIE_WIN0_T0_ATR_PARAM_SRC_ADDR + offset;
+ iowrite64(0, reg);
+ }
+}
+
+static int t7xx_pcie_mac_atr_cfg(struct t7xx_pci_dev *t7xx_dev, struct t7xx_atr_config *cfg)
+{
+ struct device *dev = &t7xx_dev->pdev->dev;
+ void __iomem *pbase = IREG_BASE(t7xx_dev);
+ int atr_size, pos, offset;
+ void __iomem *reg;
+ u64 value;
+
+ if (cfg->transparent) {
+ /* No address conversion is performed */
+ atr_size = ATR_TRANSPARENT_SIZE;
+ } else {
+ if (cfg->src_addr & (cfg->size - 1)) {
+ dev_err(dev, "Source address is not aligned to size\n");
+ return -EINVAL;
+ }
+
+ if (cfg->trsl_addr & (cfg->size - 1)) {
+ dev_err(dev, "Translation address %llx is not aligned to size %llx\n",
+ cfg->trsl_addr, cfg->size - 1);
+ return -EINVAL;
+ }
+
+ pos = __ffs64(cfg->size);
+
+ /* HW calculates the address translation space as 2^(atr_size + 1) */
+ atr_size = pos - 1;
+ }
+
+ offset = ATR_PORT_OFFSET * cfg->port + ATR_TABLE_OFFSET * cfg->table;
+
+ reg = pbase + ATR_PCIE_WIN0_T0_TRSL_ADDR + offset;
+ value = cfg->trsl_addr & ATR_PCIE_WIN0_ADDR_ALGMT;
+ iowrite64(value, reg);
+
+ reg = pbase + ATR_PCIE_WIN0_T0_TRSL_PARAM + offset;
+ iowrite32(cfg->trsl_id, reg);
+
+ reg = pbase + ATR_PCIE_WIN0_T0_ATR_PARAM_SRC_ADDR + offset;
+ value = (cfg->src_addr & ATR_PCIE_WIN0_ADDR_ALGMT) | (atr_size << 1) | BIT(0);
+ iowrite64(value, reg);
+
+ /* Ensure ATR is set */
+ ioread64(reg);
+ return 0;
+}
+
+/**
+ * t7xx_pcie_mac_atr_init() - Initialize address translation.
+ * @t7xx_dev: MTK device.
+ *
+ * Setup ATR for ports & device.
+ */
+void t7xx_pcie_mac_atr_init(struct t7xx_pci_dev *t7xx_dev)
+{
+ struct t7xx_atr_config cfg;
+ u32 i;
+
+ /* Disable for all ports */
+ for (i = ATR_SRC_PCI_WIN0; i <= ATR_SRC_AXIS_3; i++)
+ t7xx_pcie_mac_atr_tables_dis(IREG_BASE(t7xx_dev), i);
+
+ memset(&cfg, 0, sizeof(cfg));
+ /* Config ATR for RC to access device's register */
+ cfg.src_addr = pci_resource_start(t7xx_dev->pdev, T7XX_PCIE_REG_BAR);
+ cfg.size = T7XX_PCIE_REG_SIZE_CHIP;
+ cfg.trsl_addr = T7XX_PCIE_REG_TRSL_ADDR_CHIP;
+ cfg.port = T7XX_PCIE_REG_PORT;
+ cfg.table = T7XX_PCIE_REG_TABLE_NUM;
+ cfg.trsl_id = T7XX_PCIE_REG_TRSL_PORT;
+ t7xx_pcie_mac_atr_tables_dis(IREG_BASE(t7xx_dev), cfg.port);
+ t7xx_pcie_mac_atr_cfg(t7xx_dev, &cfg);
+
+ t7xx_dev->base_addr.pcie_dev_reg_trsl_addr = T7XX_PCIE_REG_TRSL_ADDR_CHIP;
+
+ /* Config ATR for EP to access RC's memory */
+ for (i = T7XX_PCIE_DEV_DMA_PORT_START; i <= T7XX_PCIE_DEV_DMA_PORT_END; i++) {
+ cfg.src_addr = T7XX_PCIE_DEV_DMA_SRC_ADDR;
+ cfg.size = T7XX_PCIE_DEV_DMA_SIZE;
+ cfg.trsl_addr = T7XX_PCIE_DEV_DMA_TRSL_ADDR;
+ cfg.port = i;
+ cfg.table = T7XX_PCIE_DEV_DMA_TABLE_NUM;
+ cfg.trsl_id = ATR_DST_PCI_TRX;
+ cfg.transparent = T7XX_PCIE_DEV_DMA_TRANSPARENT;
+ t7xx_pcie_mac_atr_tables_dis(IREG_BASE(t7xx_dev), cfg.port);
+ t7xx_pcie_mac_atr_cfg(t7xx_dev, &cfg);
+ }
+}
+
+/**
+ * t7xx_pcie_mac_enable_disable_int() - Enable/disable interrupts.
+ * @t7xx_dev: MTK device.
+ * @enable: Enable/disable.
+ *
+ * Enable or disable device interrupts.
+ */
+static void t7xx_pcie_mac_enable_disable_int(struct t7xx_pci_dev *t7xx_dev, bool enable)
+{
+ u32 value;
+
+ value = ioread32(IREG_BASE(t7xx_dev) + ISTAT_HST_CTRL);
+
+ if (enable)
+ value &= ~ISTAT_HST_CTRL_DIS;
+ else
+ value |= ISTAT_HST_CTRL_DIS;
+
+ iowrite32(value, IREG_BASE(t7xx_dev) + ISTAT_HST_CTRL);
+}
+
+void t7xx_pcie_mac_interrupts_en(struct t7xx_pci_dev *t7xx_dev)
+{
+ t7xx_pcie_mac_enable_disable_int(t7xx_dev, true);
+}
+
+void t7xx_pcie_mac_interrupts_dis(struct t7xx_pci_dev *t7xx_dev)
+{
+ t7xx_pcie_mac_enable_disable_int(t7xx_dev, false);
+}
+
+/**
+ * t7xx_pcie_mac_clear_set_int() - Clear/set interrupt by type.
+ * @t7xx_dev: MTK device.
+ * @int_type: Interrupt type.
+ * @clear: Clear/set.
+ *
+ * Clear or set device interrupt by type.
+ */
+static void t7xx_pcie_mac_clear_set_int(struct t7xx_pci_dev *t7xx_dev,
+ enum t7xx_int int_type, bool clear)
+{
+ void __iomem *reg;
+ u32 val;
+
+ if (clear)
+ reg = IREG_BASE(t7xx_dev) + IMASK_HOST_MSIX_CLR_GRP0_0;
+ else
+ reg = IREG_BASE(t7xx_dev) + IMASK_HOST_MSIX_SET_GRP0_0;
+
+ val = BIT(EXT_INT_START + int_type);
+ iowrite32(val, reg);
+}
+
+void t7xx_pcie_mac_clear_int(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type)
+{
+ t7xx_pcie_mac_clear_set_int(t7xx_dev, int_type, true);
+}
+
+void t7xx_pcie_mac_set_int(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type)
+{
+ t7xx_pcie_mac_clear_set_int(t7xx_dev, int_type, false);
+}
+
+/**
+ * t7xx_pcie_mac_clear_int_status() - Clear interrupt status by type.
+ * @t7xx_dev: MTK device.
+ * @int_type: Interrupt type.
+ *
+ * Enable or disable device interrupts' status by type.
+ */
+void t7xx_pcie_mac_clear_int_status(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type)
+{
+ void __iomem *reg = IREG_BASE(t7xx_dev) + MSIX_ISTAT_HST_GRP0_0;
+ u32 val = BIT(EXT_INT_START + int_type);
+
+ iowrite32(val, reg);
+}
+
+/**
+ * t7xx_pcie_set_mac_msix_cfg() - Write MSIX control configuration.
+ * @t7xx_dev: MTK device.
+ * @irq_count: Number of MSIX IRQ vectors.
+ *
+ * Write IRQ count to device.
+ */
+void t7xx_pcie_set_mac_msix_cfg(struct t7xx_pci_dev *t7xx_dev, unsigned int irq_count)
+{
+ u32 val = ffs(irq_count) * 2 - 1;
+
+ iowrite32(val, IREG_BASE(t7xx_dev) + T7XX_PCIE_CFG_MSIX);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_pcie_mac.h b/drivers/net/wwan/t7xx/t7xx_pcie_mac.h
new file mode 100644
index 000000000000..50336fa7e8c2
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_pcie_mac.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ */
+
+#ifndef __T7XX_PCIE_MAC_H__
+#define __T7XX_PCIE_MAC_H__
+
+#include "t7xx_pci.h"
+#include "t7xx_reg.h"
+
+#define IREG_BASE(t7xx_dev) ((t7xx_dev)->base_addr.pcie_mac_ireg_base)
+
+void t7xx_pcie_mac_interrupts_en(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_pcie_mac_interrupts_dis(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_pcie_mac_atr_init(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_pcie_mac_clear_int(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type);
+void t7xx_pcie_mac_set_int(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type);
+void t7xx_pcie_mac_clear_int_status(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type);
+void t7xx_pcie_set_mac_msix_cfg(struct t7xx_pci_dev *t7xx_dev, unsigned int irq_count);
+
+#endif /* __T7XX_PCIE_MAC_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_reg.h b/drivers/net/wwan/t7xx/t7xx_reg.h
index 7dc6c77a59e3..ad2d30d03cf4 100644
--- a/drivers/net/wwan/t7xx/t7xx_reg.h
+++ b/drivers/net/wwan/t7xx/t7xx_reg.h
@@ -19,6 +19,110 @@
#ifndef __T7XX_REG_H__
#define __T7XX_REG_H__

+#include <linux/bits.h>
+
+/* Device base address offset */
+#define MHCCIF_RC_DEV_BASE 0x10024000
+
+#define REG_RC2EP_SW_BSY 0x04
+#define REG_RC2EP_SW_INT_START 0x08
+
+#define REG_RC2EP_SW_TCHNUM 0x0c
+#define H2D_CH_EXCEPTION_ACK 1
+#define H2D_CH_EXCEPTION_CLEARQ_ACK 2
+#define H2D_CH_DS_LOCK 3
+/* Channels 4-8 are reserved */
+#define H2D_CH_SUSPEND_REQ 9
+#define H2D_CH_RESUME_REQ 10
+#define H2D_CH_SUSPEND_REQ_AP 11
+#define H2D_CH_RESUME_REQ_AP 12
+#define H2D_CH_DEVICE_RESET 13
+#define H2D_CH_DRM_DISABLE_AP 14
+
+#define REG_EP2RC_SW_INT_STS 0x10
+#define REG_EP2RC_SW_INT_ACK 0x14
+#define REG_EP2RC_SW_INT_EAP_MASK 0x20
+#define REG_EP2RC_SW_INT_EAP_MASK_SET 0x30
+#define REG_EP2RC_SW_INT_EAP_MASK_CLR 0x40
+
+#define D2H_INT_DS_LOCK_ACK BIT(0)
+#define D2H_INT_EXCEPTION_INIT BIT(1)
+#define D2H_INT_EXCEPTION_INIT_DONE BIT(2)
+#define D2H_INT_EXCEPTION_CLEARQ_DONE BIT(3)
+#define D2H_INT_EXCEPTION_ALLQ_RESET BIT(4)
+#define D2H_INT_PORT_ENUM BIT(5)
+/* Bits 6-10 are reserved */
+#define D2H_INT_SUSPEND_ACK BIT(11)
+#define D2H_INT_RESUME_ACK BIT(12)
+#define D2H_INT_SUSPEND_ACK_AP BIT(13)
+#define D2H_INT_RESUME_ACK_AP BIT(14)
+#define D2H_INT_ASYNC_SAP_HK BIT(15)
+#define D2H_INT_ASYNC_MD_HK BIT(16)
+
+/* Register base */
+#define INFRACFG_AO_DEV_CHIP 0x10001000
+
+/* ATR setting */
+#define T7XX_PCIE_REG_TRSL_ADDR_CHIP 0x10000000
+#define T7XX_PCIE_REG_SIZE_CHIP 0x00400000
+
+/* Reset Generic Unit (RGU) */
+#define TOPRGU_CH_PCIE_IRQ_STA 0x1000790c
+
+#define ATR_PORT_OFFSET 0x100
+#define ATR_TABLE_OFFSET 0x20
+#define ATR_TABLE_NUM_PER_ATR 8
+#define ATR_TRANSPARENT_SIZE 0x3f
+
+/* PCIE_MAC_IREG Register Definition */
+
+#define ISTAT_HST_CTRL 0x01ac
+#define ISTAT_HST_CTRL_DIS BIT(0)
+
+#define T7XX_PCIE_MISC_CTRL 0x0348
+#define T7XX_PCIE_MISC_MAC_SLEEP_DIS BIT(7)
+
+#define T7XX_PCIE_CFG_MSIX 0x03ec
+#define ATR_PCIE_WIN0_T0_ATR_PARAM_SRC_ADDR 0x0600
+#define ATR_PCIE_WIN0_T0_TRSL_ADDR 0x0608
+#define ATR_PCIE_WIN0_T0_TRSL_PARAM 0x0610
+#define ATR_PCIE_WIN0_ADDR_ALGMT GENMASK_ULL(63, 12)
+
+#define ATR_SRC_ADDR_INVALID 0x007f
+
+#define T7XX_PCIE_PM_RESUME_STATE 0x0d0c
+
+enum t7xx_pm_resume_state {
+ PM_RESUME_REG_STATE_L3,
+ PM_RESUME_REG_STATE_L1,
+ PM_RESUME_REG_STATE_INIT,
+ PM_RESUME_REG_STATE_EXP,
+ PM_RESUME_REG_STATE_L2,
+ PM_RESUME_REG_STATE_L2_EXP,
+};
+
+#define T7XX_PCIE_MISC_DEV_STATUS 0x0d1c
+#define MISC_STAGE_MASK GENMASK(2, 0)
+#define MISC_RESET_TYPE_PLDR BIT(26)
+#define MISC_RESET_TYPE_FLDR BIT(27)
+#define LINUX_STAGE 4
+
+#define T7XX_PCIE_RESOURCE_STATUS 0x0d28
+#define T7XX_PCIE_RESOURCE_STS_MSK GENMASK(4, 0)
+
+#define DISABLE_ASPM_LOWPWR 0x0e50
+#define ENABLE_ASPM_LOWPWR 0x0e54
+#define T7XX_L1_BIT(i) BIT((i) * 4 + 1)
+#define T7XX_L1_1_BIT(i) BIT((i) * 4 + 2)
+#define T7XX_L1_2_BIT(i) BIT((i) * 4 + 3)
+
+#define MSIX_ISTAT_HST_GRP0_0 0x0f00
+#define IMASK_HOST_MSIX_SET_GRP0_0 0x3000
+#define IMASK_HOST_MSIX_CLR_GRP0_0 0x3080
+#define EXT_INT_START 24
+#define EXT_INT_NUM 8
+#define MSIX_MSK_SET_ALL GENMASK(31, 24)
+
enum t7xx_int {
DPMAIF_INT,
CLDMA0_INT,
diff --git a/drivers/net/wwan/t7xx/t7xx_state_monitor.c b/drivers/net/wwan/t7xx/t7xx_state_monitor.c
new file mode 100644
index 000000000000..4b2e6913c45e
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_state_monitor.c
@@ -0,0 +1,540 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gfp.h>
+#include <linux/iopoll.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+
+#include "t7xx_hif_cldma.h"
+#include "t7xx_mhccif.h"
+#include "t7xx_modem_ops.h"
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_reg.h"
+#include "t7xx_state_monitor.h"
+
+#define FSM_DRM_DISABLE_DELAY_MS 200
+#define FSM_EVENT_POLL_INTERVAL_MS 20
+#define FSM_MD_EX_REC_OK_TIMEOUT_MS 10000
+#define FSM_MD_EX_PASS_TIMEOUT_MS 45000
+#define FSM_CMD_TIMEOUT_MS 2000
+
+void t7xx_fsm_notifier_register(struct t7xx_modem *md, struct t7xx_fsm_notifier *notifier)
+{
+ struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctl->notifier_lock, flags);
+ list_add_tail(&notifier->entry, &ctl->notifier_list);
+ spin_unlock_irqrestore(&ctl->notifier_lock, flags);
+}
+
+void t7xx_fsm_notifier_unregister(struct t7xx_modem *md, struct t7xx_fsm_notifier *notifier)
+{
+ struct t7xx_fsm_notifier *notifier_cur, *notifier_next;
+ struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctl->notifier_lock, flags);
+ list_for_each_entry_safe(notifier_cur, notifier_next, &ctl->notifier_list, entry) {
+ if (notifier_cur == notifier)
+ list_del(&notifier->entry);
+ }
+ spin_unlock_irqrestore(&ctl->notifier_lock, flags);
+}
+
+static void fsm_state_notify(struct t7xx_modem *md, enum md_state state)
+{
+ struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
+ struct t7xx_fsm_notifier *notifier;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctl->notifier_lock, flags);
+ list_for_each_entry(notifier, &ctl->notifier_list, entry) {
+ spin_unlock_irqrestore(&ctl->notifier_lock, flags);
+ if (notifier->notifier_fn)
+ notifier->notifier_fn(state, notifier->data);
+
+ spin_lock_irqsave(&ctl->notifier_lock, flags);
+ }
+ spin_unlock_irqrestore(&ctl->notifier_lock, flags);
+}
+
+void t7xx_fsm_broadcast_state(struct t7xx_fsm_ctl *ctl, enum md_state state)
+{
+ ctl->md_state = state;
+ fsm_state_notify(ctl->md, state);
+}
+
+static void fsm_finish_command(struct t7xx_fsm_ctl *ctl, struct t7xx_fsm_command *cmd, int result)
+{
+ if (cmd->flag & FSM_CMD_FLAG_WAIT_FOR_COMPLETION) {
+ *cmd->ret = result;
+ complete_all(cmd->done);
+ }
+
+ kfree(cmd);
+}
+
+static void fsm_del_kf_event(struct t7xx_fsm_event *event)
+{
+ list_del(&event->entry);
+ kfree(event);
+}
+
+static void fsm_flush_event_cmd_qs(struct t7xx_fsm_ctl *ctl)
+{
+ struct device *dev = &ctl->md->t7xx_dev->pdev->dev;
+ struct t7xx_fsm_event *event, *evt_next;
+ struct t7xx_fsm_command *cmd, *cmd_next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctl->command_lock, flags);
+ list_for_each_entry_safe(cmd, cmd_next, &ctl->command_queue, entry) {
+ dev_warn(dev, "Unhandled command %d\n", cmd->cmd_id);
+ list_del(&cmd->entry);
+ fsm_finish_command(ctl, cmd, -EINVAL);
+ }
+ spin_unlock_irqrestore(&ctl->command_lock, flags);
+
+ spin_lock_irqsave(&ctl->event_lock, flags);
+ list_for_each_entry_safe(event, evt_next, &ctl->event_queue, entry) {
+ dev_warn(dev, "Unhandled event %d\n", event->event_id);
+ fsm_del_kf_event(event);
+ }
+ spin_unlock_irqrestore(&ctl->event_lock, flags);
+}
+
+static void fsm_wait_for_event(struct t7xx_fsm_ctl *ctl, enum t7xx_fsm_event_state event_expected,
+ enum t7xx_fsm_event_state event_ignore, int retries)
+{
+ struct t7xx_fsm_event *event;
+ bool event_received = false;
+ unsigned long flags;
+ int cnt = 0;
+
+ while (cnt++ < retries && !event_received) {
+ bool sleep_required = true;
+
+ if (kthread_should_stop())
+ return;
+
+ spin_lock_irqsave(&ctl->event_lock, flags);
+ event = list_first_entry_or_null(&ctl->event_queue, struct t7xx_fsm_event, entry);
+ if (event) {
+ event_received = event->event_id == event_expected;
+ if (event_received || event->event_id == event_ignore) {
+ fsm_del_kf_event(event);
+ sleep_required = false;
+ }
+ }
+ spin_unlock_irqrestore(&ctl->event_lock, flags);
+
+ if (sleep_required)
+ msleep(FSM_EVENT_POLL_INTERVAL_MS);
+ }
+}
+
+static void fsm_routine_exception(struct t7xx_fsm_ctl *ctl, struct t7xx_fsm_command *cmd,
+ enum t7xx_ex_reason reason)
+{
+ struct device *dev = &ctl->md->t7xx_dev->pdev->dev;
+
+ if (ctl->curr_state != FSM_STATE_READY && ctl->curr_state != FSM_STATE_STARTING) {
+ if (cmd)
+ fsm_finish_command(ctl, cmd, -EINVAL);
+
+ return;
+ }
+
+ ctl->curr_state = FSM_STATE_EXCEPTION;
+
+ switch (reason) {
+ case EXCEPTION_HS_TIMEOUT:
+ dev_err(dev, "Boot Handshake failure\n");
+ break;
+
+ case EXCEPTION_EVENT:
+ dev_err(dev, "Exception event\n");
+ t7xx_fsm_broadcast_state(ctl, MD_STATE_EXCEPTION);
+ t7xx_md_exception_handshake(ctl->md);
+
+ fsm_wait_for_event(ctl, FSM_EVENT_MD_EX_REC_OK, FSM_EVENT_MD_EX,
+ FSM_MD_EX_REC_OK_TIMEOUT_MS / FSM_EVENT_POLL_INTERVAL_MS);
+ fsm_wait_for_event(ctl, FSM_EVENT_MD_EX_PASS, FSM_EVENT_INVALID,
+ FSM_MD_EX_PASS_TIMEOUT_MS / FSM_EVENT_POLL_INTERVAL_MS);
+ break;
+
+ default:
+ dev_err(dev, "Exception %d\n", reason);
+ break;
+ }
+
+ if (cmd)
+ fsm_finish_command(ctl, cmd, 0);
+}
+
+static int fsm_stopped_handler(struct t7xx_fsm_ctl *ctl)
+{
+ ctl->curr_state = FSM_STATE_STOPPED;
+
+ t7xx_fsm_broadcast_state(ctl, MD_STATE_STOPPED);
+ return t7xx_md_reset(ctl->md->t7xx_dev);
+}
+
+static void fsm_routine_stopped(struct t7xx_fsm_ctl *ctl, struct t7xx_fsm_command *cmd)
+{
+ if (ctl->curr_state == FSM_STATE_STOPPED) {
+ fsm_finish_command(ctl, cmd, -EINVAL);
+ return;
+ }
+
+ fsm_finish_command(ctl, cmd, fsm_stopped_handler(ctl));
+}
+
+static void fsm_routine_stopping(struct t7xx_fsm_ctl *ctl, struct t7xx_fsm_command *cmd)
+{
+ struct t7xx_pci_dev *t7xx_dev;
+ struct cldma_ctrl *md_ctrl;
+ int err;
+
+ if (ctl->curr_state == FSM_STATE_STOPPED || ctl->curr_state == FSM_STATE_STOPPING) {
+ fsm_finish_command(ctl, cmd, -EINVAL);
+ return;
+ }
+
+ md_ctrl = ctl->md->md_ctrl[CLDMA_ID_MD];
+ t7xx_dev = ctl->md->t7xx_dev;
+
+ ctl->curr_state = FSM_STATE_STOPPING;
+ t7xx_fsm_broadcast_state(ctl, MD_STATE_WAITING_TO_STOP);
+ t7xx_cldma_stop(md_ctrl);
+
+ if (!ctl->md->rgu_irq_asserted) {
+ t7xx_mhccif_h2d_swint_trigger(t7xx_dev, H2D_CH_DRM_DISABLE_AP);
+ /* Wait for the DRM disable to take effect */
+ msleep(FSM_DRM_DISABLE_DELAY_MS);
+
+ err = t7xx_acpi_fldr_func(t7xx_dev);
+ if (err)
+ t7xx_mhccif_h2d_swint_trigger(t7xx_dev, H2D_CH_DEVICE_RESET);
+ }
+
+ fsm_finish_command(ctl, cmd, fsm_stopped_handler(ctl));
+}
+
+static void t7xx_fsm_broadcast_ready_state(struct t7xx_fsm_ctl *ctl)
+{
+ if (ctl->md_state != MD_STATE_WAITING_FOR_HS2)
+ return;
+
+ ctl->md_state = MD_STATE_READY;
+
+ fsm_state_notify(ctl->md, MD_STATE_READY);
+}
+
+static void fsm_routine_ready(struct t7xx_fsm_ctl *ctl)
+{
+ struct t7xx_modem *md = ctl->md;
+
+ ctl->curr_state = FSM_STATE_READY;
+ t7xx_fsm_broadcast_ready_state(ctl);
+ t7xx_md_event_notify(md, FSM_READY);
+}
+
+static int fsm_routine_starting(struct t7xx_fsm_ctl *ctl)
+{
+ struct t7xx_modem *md = ctl->md;
+ struct device *dev;
+
+ ctl->curr_state = FSM_STATE_STARTING;
+
+ t7xx_fsm_broadcast_state(ctl, MD_STATE_WAITING_FOR_HS1);
+ t7xx_md_event_notify(md, FSM_START);
+
+ wait_event_interruptible_timeout(ctl->async_hk_wq, md->core_md.ready || ctl->exp_flg,
+ HZ * 60);
+ dev = &md->t7xx_dev->pdev->dev;
+
+ if (ctl->exp_flg)
+ dev_err(dev, "MD exception is captured during handshake\n");
+
+ if (!md->core_md.ready) {
+ dev_err(dev, "MD handshake timeout\n");
+ fsm_routine_exception(ctl, NULL, EXCEPTION_HS_TIMEOUT);
+ return -ETIMEDOUT;
+ }
+
+ fsm_routine_ready(ctl);
+ return 0;
+}
+
+static void fsm_routine_start(struct t7xx_fsm_ctl *ctl, struct t7xx_fsm_command *cmd)
+{
+ struct t7xx_modem *md = ctl->md;
+ u32 dev_status;
+ int ret;
+
+ if (!md)
+ return;
+
+ if (ctl->curr_state != FSM_STATE_INIT && ctl->curr_state != FSM_STATE_PRE_START &&
+ ctl->curr_state != FSM_STATE_STOPPED) {
+ fsm_finish_command(ctl, cmd, -EINVAL);
+ return;
+ }
+
+ ctl->curr_state = FSM_STATE_PRE_START;
+ t7xx_md_event_notify(md, FSM_PRE_START);
+
+ ret = read_poll_timeout(ioread32, dev_status,
+ (dev_status & MISC_STAGE_MASK) == LINUX_STAGE, 20000, 2000000,
+ false, IREG_BASE(md->t7xx_dev) + T7XX_PCIE_MISC_DEV_STATUS);
+ if (ret) {
+ struct device *dev = &md->t7xx_dev->pdev->dev;
+
+ fsm_finish_command(ctl, cmd, -ETIMEDOUT);
+ dev_err(dev, "Invalid device status 0x%lx\n", dev_status & MISC_STAGE_MASK);
+ return;
+ }
+
+ t7xx_cldma_hif_hw_init(md->md_ctrl[CLDMA_ID_MD]);
+ fsm_finish_command(ctl, cmd, fsm_routine_starting(ctl));
+}
+
+static int fsm_main_thread(void *data)
+{
+ struct t7xx_fsm_ctl *ctl = data;
+ struct t7xx_fsm_command *cmd;
+ unsigned long flags;
+
+ while (!kthread_should_stop()) {
+ if (wait_event_interruptible(ctl->command_wq, !list_empty(&ctl->command_queue) ||
+ kthread_should_stop()))
+ continue;
+
+ if (kthread_should_stop())
+ break;
+
+ spin_lock_irqsave(&ctl->command_lock, flags);
+ cmd = list_first_entry(&ctl->command_queue, struct t7xx_fsm_command, entry);
+ list_del(&cmd->entry);
+ spin_unlock_irqrestore(&ctl->command_lock, flags);
+
+ switch (cmd->cmd_id) {
+ case FSM_CMD_START:
+ fsm_routine_start(ctl, cmd);
+ break;
+
+ case FSM_CMD_EXCEPTION:
+ fsm_routine_exception(ctl, cmd, FIELD_GET(FSM_CMD_EX_REASON, cmd->flag));
+ break;
+
+ case FSM_CMD_PRE_STOP:
+ fsm_routine_stopping(ctl, cmd);
+ break;
+
+ case FSM_CMD_STOP:
+ fsm_routine_stopped(ctl, cmd);
+ break;
+
+ default:
+ fsm_finish_command(ctl, cmd, -EINVAL);
+ fsm_flush_event_cmd_qs(ctl);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+int t7xx_fsm_append_cmd(struct t7xx_fsm_ctl *ctl, enum t7xx_fsm_cmd_state cmd_id, unsigned int flag)
+{
+ DECLARE_COMPLETION_ONSTACK(done);
+ struct t7xx_fsm_command *cmd;
+ unsigned long flags;
+ int ret;
+
+ cmd = kzalloc(sizeof(*cmd), flag & FSM_CMD_FLAG_IN_INTERRUPT ? GFP_ATOMIC : GFP_KERNEL);
+ if (!cmd)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&cmd->entry);
+ cmd->cmd_id = cmd_id;
+ cmd->flag = flag;
+ if (flag & FSM_CMD_FLAG_WAIT_FOR_COMPLETION) {
+ cmd->done = &done;
+ cmd->ret = &ret;
+ }
+
+ spin_lock_irqsave(&ctl->command_lock, flags);
+ list_add_tail(&cmd->entry, &ctl->command_queue);
+ spin_unlock_irqrestore(&ctl->command_lock, flags);
+
+ wake_up(&ctl->command_wq);
+
+ if (flag & FSM_CMD_FLAG_WAIT_FOR_COMPLETION) {
+ unsigned long wait_ret;
+
+ wait_ret = wait_for_completion_timeout(&done,
+ msecs_to_jiffies(FSM_CMD_TIMEOUT_MS));
+ if (!wait_ret)
+ return -ETIMEDOUT;
+
+ return ret;
+ }
+
+ return 0;
+}
+
+int t7xx_fsm_append_event(struct t7xx_fsm_ctl *ctl, enum t7xx_fsm_event_state event_id,
+ unsigned char *data, unsigned int length)
+{
+ struct device *dev = &ctl->md->t7xx_dev->pdev->dev;
+ struct t7xx_fsm_event *event;
+ unsigned long flags;
+
+ if (event_id <= FSM_EVENT_INVALID || event_id >= FSM_EVENT_MAX) {
+ dev_err(dev, "Invalid event %d\n", event_id);
+ return -EINVAL;
+ }
+
+ event = kmalloc(sizeof(*event) + length, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+ if (!event)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&event->entry);
+ event->event_id = event_id;
+ event->length = length;
+
+ if (data && length)
+ memcpy(event->data, data, length);
+
+ spin_lock_irqsave(&ctl->event_lock, flags);
+ list_add_tail(&event->entry, &ctl->event_queue);
+ spin_unlock_irqrestore(&ctl->event_lock, flags);
+
+ wake_up_all(&ctl->event_wq);
+ return 0;
+}
+
+void t7xx_fsm_clr_event(struct t7xx_fsm_ctl *ctl, enum t7xx_fsm_event_state event_id)
+{
+ struct t7xx_fsm_event *event, *evt_next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctl->event_lock, flags);
+ list_for_each_entry_safe(event, evt_next, &ctl->event_queue, entry) {
+ if (event->event_id == event_id)
+ fsm_del_kf_event(event);
+ }
+ spin_unlock_irqrestore(&ctl->event_lock, flags);
+}
+
+enum md_state t7xx_fsm_get_md_state(struct t7xx_fsm_ctl *ctl)
+{
+ if (ctl)
+ return ctl->md_state;
+
+ return MD_STATE_INVALID;
+}
+
+unsigned int t7xx_fsm_get_ctl_state(struct t7xx_fsm_ctl *ctl)
+{
+ if (ctl)
+ return ctl->curr_state;
+
+ return FSM_STATE_STOPPED;
+}
+
+int t7xx_fsm_recv_md_intr(struct t7xx_fsm_ctl *ctl, enum t7xx_md_irq_type type)
+{
+ unsigned int cmd_flags = FSM_CMD_FLAG_IN_INTERRUPT;
+
+ if (type == MD_IRQ_PORT_ENUM) {
+ return t7xx_fsm_append_cmd(ctl, FSM_CMD_START, cmd_flags);
+ } else if (type == MD_IRQ_CCIF_EX) {
+ ctl->exp_flg = true;
+ wake_up(&ctl->async_hk_wq);
+ cmd_flags |= FIELD_PREP(FSM_CMD_EX_REASON, EXCEPTION_EVENT);
+ return t7xx_fsm_append_cmd(ctl, FSM_CMD_EXCEPTION, cmd_flags);
+ }
+
+ return -EINVAL;
+}
+
+void t7xx_fsm_reset(struct t7xx_modem *md)
+{
+ struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
+
+ fsm_flush_event_cmd_qs(ctl);
+ ctl->curr_state = FSM_STATE_STOPPED;
+ ctl->exp_flg = false;
+}
+
+int t7xx_fsm_init(struct t7xx_modem *md)
+{
+ struct device *dev = &md->t7xx_dev->pdev->dev;
+ struct t7xx_fsm_ctl *ctl;
+
+ ctl = devm_kzalloc(dev, sizeof(*ctl), GFP_KERNEL);
+ if (!ctl)
+ return -ENOMEM;
+
+ md->fsm_ctl = ctl;
+ ctl->md = md;
+ ctl->curr_state = FSM_STATE_INIT;
+ INIT_LIST_HEAD(&ctl->command_queue);
+ INIT_LIST_HEAD(&ctl->event_queue);
+ init_waitqueue_head(&ctl->async_hk_wq);
+ init_waitqueue_head(&ctl->event_wq);
+ INIT_LIST_HEAD(&ctl->notifier_list);
+ init_waitqueue_head(&ctl->command_wq);
+ spin_lock_init(&ctl->event_lock);
+ spin_lock_init(&ctl->command_lock);
+ ctl->exp_flg = false;
+ spin_lock_init(&ctl->notifier_lock);
+
+ ctl->fsm_thread = kthread_run(fsm_main_thread, ctl, "t7xx_fsm");
+ return PTR_ERR_OR_ZERO(ctl->fsm_thread);
+}
+
+void t7xx_fsm_uninit(struct t7xx_modem *md)
+{
+ struct t7xx_fsm_ctl *ctl = md->fsm_ctl;
+
+ if (!ctl)
+ return;
+
+ if (ctl->fsm_thread)
+ kthread_stop(ctl->fsm_thread);
+
+ fsm_flush_event_cmd_qs(ctl);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_state_monitor.h b/drivers/net/wwan/t7xx/t7xx_state_monitor.h
new file mode 100644
index 000000000000..a6041a51809e
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_state_monitor.h
@@ -0,0 +1,133 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ *
+ * Contributors:
+ * Eliot Lee <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_MONITOR_H__
+#define __T7XX_MONITOR_H__
+
+#include <linux/bits.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+
+#include "t7xx_modem_ops.h"
+
+enum t7xx_fsm_state {
+ FSM_STATE_INIT,
+ FSM_STATE_PRE_START,
+ FSM_STATE_STARTING,
+ FSM_STATE_READY,
+ FSM_STATE_EXCEPTION,
+ FSM_STATE_STOPPING,
+ FSM_STATE_STOPPED,
+};
+
+enum t7xx_fsm_event_state {
+ FSM_EVENT_INVALID,
+ FSM_EVENT_MD_EX,
+ FSM_EVENT_MD_EX_REC_OK,
+ FSM_EVENT_MD_EX_PASS,
+ FSM_EVENT_MAX
+};
+
+enum t7xx_fsm_cmd_state {
+ FSM_CMD_INVALID,
+ FSM_CMD_START,
+ FSM_CMD_EXCEPTION,
+ FSM_CMD_PRE_STOP,
+ FSM_CMD_STOP,
+};
+
+enum t7xx_ex_reason {
+ EXCEPTION_HS_TIMEOUT,
+ EXCEPTION_EVENT,
+};
+
+enum t7xx_md_irq_type {
+ MD_IRQ_WDT,
+ MD_IRQ_CCIF_EX,
+ MD_IRQ_PORT_ENUM,
+};
+
+enum md_state {
+ MD_STATE_INVALID,
+ MD_STATE_WAITING_FOR_HS1,
+ MD_STATE_WAITING_FOR_HS2,
+ MD_STATE_READY,
+ MD_STATE_EXCEPTION,
+ MD_STATE_WAITING_TO_STOP,
+ MD_STATE_STOPPED,
+};
+
+#define FSM_CMD_FLAG_WAIT_FOR_COMPLETION BIT(0)
+#define FSM_CMD_FLAG_FLIGHT_MODE BIT(1)
+#define FSM_CMD_FLAG_IN_INTERRUPT BIT(2)
+#define FSM_CMD_EX_REASON GENMASK(23, 16)
+
+struct t7xx_fsm_ctl {
+ struct t7xx_modem *md;
+ enum md_state md_state;
+ unsigned int curr_state;
+ struct list_head command_queue;
+ struct list_head event_queue;
+ wait_queue_head_t command_wq;
+ wait_queue_head_t event_wq;
+ wait_queue_head_t async_hk_wq;
+ spinlock_t event_lock; /* Protects event queue */
+ spinlock_t command_lock; /* Protects command queue */
+ struct task_struct *fsm_thread;
+ bool exp_flg;
+ spinlock_t notifier_lock; /* Protects notifier list */
+ struct list_head notifier_list;
+};
+
+struct t7xx_fsm_event {
+ struct list_head entry;
+ enum t7xx_fsm_event_state event_id;
+ unsigned int length;
+ unsigned char data[];
+};
+
+struct t7xx_fsm_command {
+ struct list_head entry;
+ enum t7xx_fsm_cmd_state cmd_id;
+ unsigned int flag;
+ struct completion *done;
+ int *ret;
+};
+
+struct t7xx_fsm_notifier {
+ struct list_head entry;
+ int (*notifier_fn)(enum md_state state, void *data);
+ void *data;
+};
+
+int t7xx_fsm_append_cmd(struct t7xx_fsm_ctl *ctl, enum t7xx_fsm_cmd_state cmd_id,
+ unsigned int flag);
+int t7xx_fsm_append_event(struct t7xx_fsm_ctl *ctl, enum t7xx_fsm_event_state event_id,
+ unsigned char *data, unsigned int length);
+void t7xx_fsm_clr_event(struct t7xx_fsm_ctl *ctl, enum t7xx_fsm_event_state event_id);
+void t7xx_fsm_broadcast_state(struct t7xx_fsm_ctl *ctl, enum md_state state);
+void t7xx_fsm_reset(struct t7xx_modem *md);
+int t7xx_fsm_init(struct t7xx_modem *md);
+void t7xx_fsm_uninit(struct t7xx_modem *md);
+int t7xx_fsm_recv_md_intr(struct t7xx_fsm_ctl *ctl, enum t7xx_md_irq_type type);
+enum md_state t7xx_fsm_get_md_state(struct t7xx_fsm_ctl *ctl);
+unsigned int t7xx_fsm_get_ctl_state(struct t7xx_fsm_ctl *ctl);
+void t7xx_fsm_notifier_register(struct t7xx_modem *md, struct t7xx_fsm_notifier *notifier);
+void t7xx_fsm_notifier_unregister(struct t7xx_modem *md, struct t7xx_fsm_notifier *notifier);
+
+#endif /* __T7XX_MONITOR_H__ */
--
2.25.1


2022-05-09 06:41:57

by Martinez, Ricardo

[permalink] [raw]
Subject: [PATCH net-next v7 08/14] net: wwan: t7xx: Data path HW layer

From: Haijun Liu <[email protected]>

Data Path Modem AP Interface (DPMAIF) HW layer provides HW abstraction
for the upper layer (DPMAIF HIF). It implements functions to do the HW
configuration, TX/RX control and interrupt handling.

Signed-off-by: Haijun Liu <[email protected]>
Signed-off-by: Chandrashekar Devegowda <[email protected]>
Co-developed-by: Ricardo Martinez <[email protected]>
Signed-off-by: Ricardo Martinez <[email protected]>
Reviewed-by: Loic Poulain <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
---
drivers/net/wwan/t7xx/t7xx_dpmaif.c | 1283 +++++++++++++++++++++++++++
drivers/net/wwan/t7xx/t7xx_dpmaif.h | 179 ++++
drivers/net/wwan/t7xx/t7xx_reg.h | 213 +++++
3 files changed, 1675 insertions(+)
create mode 100644 drivers/net/wwan/t7xx/t7xx_dpmaif.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_dpmaif.h

diff --git a/drivers/net/wwan/t7xx/t7xx_dpmaif.c b/drivers/net/wwan/t7xx/t7xx_dpmaif.c
new file mode 100644
index 000000000000..c8bf6929af51
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_dpmaif.c
@@ -0,0 +1,1283 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Andy Shevchenko <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/types.h>
+
+#include "t7xx_dpmaif.h"
+#include "t7xx_reg.h"
+
+#define ioread32_poll_timeout_atomic(addr, val, cond, delay_us, timeout_us) \
+ readx_poll_timeout_atomic(ioread32, addr, val, cond, delay_us, timeout_us)
+
+static int t7xx_dpmaif_init_intr(struct dpmaif_hw_info *hw_info)
+{
+ struct dpmaif_isr_en_mask *isr_en_msk = &hw_info->isr_en_mask;
+ u32 value, ul_intr_enable, dl_intr_enable;
+ int ret;
+
+ ul_intr_enable = DP_UL_INT_ERR_MSK | DP_UL_INT_QDONE_MSK;
+ isr_en_msk->ap_ul_l2intr_en_msk = ul_intr_enable;
+ iowrite32(DPMAIF_AP_ALL_L2TISAR0_MASK, hw_info->pcie_base + DPMAIF_AP_L2TISAR0);
+
+ /* Set interrupt enable mask */
+ iowrite32(ul_intr_enable, hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMCR0);
+ iowrite32(~ul_intr_enable, hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMSR0);
+
+ /* Check mask status */
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMR0,
+ value, (value & ul_intr_enable) != ul_intr_enable, 0,
+ DPMAIF_CHECK_INIT_TIMEOUT_US);
+ if (ret)
+ return ret;
+
+ dl_intr_enable = DP_DL_INT_PITCNT_LEN_ERR | DP_DL_INT_BATCNT_LEN_ERR;
+ isr_en_msk->ap_dl_l2intr_err_en_msk = dl_intr_enable;
+ ul_intr_enable = DPMAIF_DL_INT_DLQ0_QDONE | DPMAIF_DL_INT_DLQ0_PITCNT_LEN |
+ DPMAIF_DL_INT_DLQ1_QDONE | DPMAIF_DL_INT_DLQ1_PITCNT_LEN;
+ isr_en_msk->ap_ul_l2intr_en_msk = ul_intr_enable;
+ iowrite32(DPMAIF_AP_APDL_ALL_L2TISAR0_MASK, hw_info->pcie_base + DPMAIF_AP_APDL_L2TISAR0);
+
+ /* Set DL ISR PD enable mask */
+ iowrite32(~ul_intr_enable, hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMSR0);
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMR0,
+ value, (value & ul_intr_enable) != ul_intr_enable, 0,
+ DPMAIF_CHECK_INIT_TIMEOUT_US);
+ if (ret)
+ return ret;
+
+ isr_en_msk->ap_udl_ip_busy_en_msk = DPMAIF_UDL_IP_BUSY;
+ iowrite32(DPMAIF_AP_IP_BUSY_MASK, hw_info->pcie_base + DPMAIF_AP_IP_BUSY);
+ iowrite32(isr_en_msk->ap_udl_ip_busy_en_msk,
+ hw_info->pcie_base + DPMAIF_AO_AP_DLUL_IP_BUSY_MASK);
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_UL_AP_L1TIMR0);
+ value |= DPMAIF_DL_INT_Q2APTOP | DPMAIF_DL_INT_Q2TOQ1;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_UL_AP_L1TIMR0);
+ iowrite32(DPMA_HPC_ALL_INT_MASK, hw_info->pcie_base + DPMAIF_HPC_INTR_MASK);
+
+ return 0;
+}
+
+static void t7xx_dpmaif_mask_ulq_intr(struct dpmaif_hw_info *hw_info, unsigned int q_num)
+{
+ struct dpmaif_isr_en_mask *isr_en_msk;
+ u32 value, ul_int_que_done;
+ int ret;
+
+ isr_en_msk = &hw_info->isr_en_mask;
+ ul_int_que_done = BIT(q_num + DP_UL_INT_DONE_OFFSET) & DP_UL_INT_QDONE_MSK;
+ isr_en_msk->ap_ul_l2intr_en_msk &= ~ul_int_que_done;
+ iowrite32(ul_int_que_done, hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMSR0);
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMR0,
+ value, (value & ul_int_que_done) == ul_int_que_done, 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (ret)
+ dev_err(hw_info->dev,
+ "Could not mask the UL interrupt. DPMAIF_AO_UL_AP_L2TIMR0 is 0x%x\n",
+ value);
+}
+
+void t7xx_dpmaif_unmask_ulq_intr(struct dpmaif_hw_info *hw_info, unsigned int q_num)
+{
+ struct dpmaif_isr_en_mask *isr_en_msk;
+ u32 value, ul_int_que_done;
+ int ret;
+
+ isr_en_msk = &hw_info->isr_en_mask;
+ ul_int_que_done = BIT(q_num + DP_UL_INT_DONE_OFFSET) & DP_UL_INT_QDONE_MSK;
+ isr_en_msk->ap_ul_l2intr_en_msk |= ul_int_que_done;
+ iowrite32(ul_int_que_done, hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMCR0);
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMR0,
+ value, (value & ul_int_que_done) != ul_int_que_done, 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (ret)
+ dev_err(hw_info->dev,
+ "Could not unmask the UL interrupt. DPMAIF_AO_UL_AP_L2TIMR0 is 0x%x\n",
+ value);
+}
+
+void t7xx_dpmaif_dl_unmask_batcnt_len_err_intr(struct dpmaif_hw_info *hw_info)
+{
+ hw_info->isr_en_mask.ap_dl_l2intr_en_msk |= DP_DL_INT_BATCNT_LEN_ERR;
+ iowrite32(DP_DL_INT_BATCNT_LEN_ERR, hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMCR0);
+}
+
+void t7xx_dpmaif_dl_unmask_pitcnt_len_err_intr(struct dpmaif_hw_info *hw_info)
+{
+ hw_info->isr_en_mask.ap_dl_l2intr_en_msk |= DP_DL_INT_PITCNT_LEN_ERR;
+ iowrite32(DP_DL_INT_PITCNT_LEN_ERR, hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMCR0);
+}
+
+static u32 t7xx_update_dlq_intr(struct dpmaif_hw_info *hw_info, u32 q_done)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMR0);
+ iowrite32(q_done, hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMSR0);
+ return value;
+}
+
+static int t7xx_mask_dlq_intr(struct dpmaif_hw_info *hw_info, unsigned int qno)
+{
+ u32 value, q_done;
+ int ret;
+
+ q_done = qno == DPF_RX_QNO0 ? DPMAIF_DL_INT_DLQ0_QDONE : DPMAIF_DL_INT_DLQ1_QDONE;
+ iowrite32(q_done, hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMSR0);
+
+ ret = read_poll_timeout_atomic(t7xx_update_dlq_intr, value, value & q_done,
+ 0, DPMAIF_CHECK_TIMEOUT_US, false, hw_info, q_done);
+ if (ret) {
+ dev_err(hw_info->dev,
+ "Could not mask the DL interrupt. DPMAIF_AO_UL_AP_L2TIMR0 is 0x%x\n",
+ value);
+ return -ETIMEDOUT;
+ }
+
+ hw_info->isr_en_mask.ap_dl_l2intr_en_msk &= ~q_done;
+ return 0;
+}
+
+void t7xx_dpmaif_dlq_unmask_rx_done(struct dpmaif_hw_info *hw_info, unsigned int qno)
+{
+ u32 mask;
+
+ mask = qno == DPF_RX_QNO0 ? DPMAIF_DL_INT_DLQ0_QDONE : DPMAIF_DL_INT_DLQ1_QDONE;
+ iowrite32(mask, hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMCR0);
+ hw_info->isr_en_mask.ap_dl_l2intr_en_msk |= mask;
+}
+
+void t7xx_dpmaif_clr_ip_busy_sts(struct dpmaif_hw_info *hw_info)
+{
+ u32 ip_busy_sts;
+
+ ip_busy_sts = ioread32(hw_info->pcie_base + DPMAIF_AP_IP_BUSY);
+ iowrite32(ip_busy_sts, hw_info->pcie_base + DPMAIF_AP_IP_BUSY);
+}
+
+static void t7xx_dpmaif_dlq_mask_rx_pitcnt_len_err_intr(struct dpmaif_hw_info *hw_info,
+ unsigned int qno)
+{
+ if (qno == DPF_RX_QNO0)
+ iowrite32(DPMAIF_DL_INT_DLQ0_PITCNT_LEN,
+ hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMSR0);
+ else
+ iowrite32(DPMAIF_DL_INT_DLQ1_PITCNT_LEN,
+ hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMSR0);
+}
+
+void t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(struct dpmaif_hw_info *hw_info,
+ unsigned int qno)
+{
+ if (qno == DPF_RX_QNO0)
+ iowrite32(DPMAIF_DL_INT_DLQ0_PITCNT_LEN,
+ hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMCR0);
+ else
+ iowrite32(DPMAIF_DL_INT_DLQ1_PITCNT_LEN,
+ hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMCR0);
+}
+
+void t7xx_dpmaif_ul_clr_all_intr(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_AP_ALL_L2TISAR0_MASK, hw_info->pcie_base + DPMAIF_AP_L2TISAR0);
+}
+
+void t7xx_dpmaif_dl_clr_all_intr(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_AP_APDL_ALL_L2TISAR0_MASK, hw_info->pcie_base + DPMAIF_AP_APDL_L2TISAR0);
+}
+
+static void t7xx_dpmaif_set_intr_para(struct dpmaif_hw_intr_st_para *para,
+ enum dpmaif_hw_intr_type intr_type, unsigned int intr_queue)
+{
+ para->intr_types[para->intr_cnt] = intr_type;
+ para->intr_queues[para->intr_cnt] = intr_queue;
+ para->intr_cnt++;
+}
+
+/* The para->intr_cnt counter is set to zero before this function is called.
+ * It does not check for overflow as there is no risk of overflowing intr_types or intr_queues.
+ */
+static void t7xx_dpmaif_hw_check_tx_intr(struct dpmaif_hw_info *hw_info,
+ unsigned int intr_status,
+ struct dpmaif_hw_intr_st_para *para)
+{
+ unsigned long value;
+
+ value = FIELD_GET(DP_UL_INT_QDONE_MSK, intr_status);
+ if (value) {
+ unsigned int index;
+
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_UL_DONE, value);
+
+ for_each_set_bit(index, &value, DPMAIF_TXQ_NUM)
+ t7xx_dpmaif_mask_ulq_intr(hw_info, index);
+ }
+
+ value = FIELD_GET(DP_UL_INT_EMPTY_MSK, intr_status);
+ if (value)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_UL_DRB_EMPTY, value);
+
+ value = FIELD_GET(DP_UL_INT_MD_NOTREADY_MSK, intr_status);
+ if (value)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_UL_MD_NOTREADY, value);
+
+ value = FIELD_GET(DP_UL_INT_MD_PWR_NOTREADY_MSK, intr_status);
+ if (value)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_UL_MD_PWR_NOTREADY, value);
+
+ value = FIELD_GET(DP_UL_INT_ERR_MSK, intr_status);
+ if (value)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_UL_LEN_ERR, value);
+
+ /* Clear interrupt status */
+ iowrite32(intr_status, hw_info->pcie_base + DPMAIF_AP_L2TISAR0);
+}
+
+/* The para->intr_cnt counter is set to zero before this function is called.
+ * It does not check for overflow as there is no risk of overflowing intr_types or intr_queues.
+ */
+static void t7xx_dpmaif_hw_check_rx_intr(struct dpmaif_hw_info *hw_info,
+ unsigned int intr_status,
+ struct dpmaif_hw_intr_st_para *para, int qno)
+{
+ if (qno == DPF_RX_QNO_DFT) {
+ if (intr_status & DP_DL_INT_SKB_LEN_ERR)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_SKB_LEN_ERR, DPF_RX_QNO_DFT);
+
+ if (intr_status & DP_DL_INT_BATCNT_LEN_ERR) {
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_BATCNT_LEN_ERR, DPF_RX_QNO_DFT);
+ hw_info->isr_en_mask.ap_dl_l2intr_en_msk &= ~DP_DL_INT_BATCNT_LEN_ERR;
+ iowrite32(DP_DL_INT_BATCNT_LEN_ERR,
+ hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMSR0);
+ }
+
+ if (intr_status & DP_DL_INT_PITCNT_LEN_ERR) {
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_PITCNT_LEN_ERR, DPF_RX_QNO_DFT);
+ hw_info->isr_en_mask.ap_dl_l2intr_en_msk &= ~DP_DL_INT_PITCNT_LEN_ERR;
+ iowrite32(DP_DL_INT_PITCNT_LEN_ERR,
+ hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMSR0);
+ }
+
+ if (intr_status & DP_DL_INT_PKT_EMPTY_MSK)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_PKT_EMPTY_SET, DPF_RX_QNO_DFT);
+
+ if (intr_status & DP_DL_INT_FRG_EMPTY_MSK)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_FRG_EMPTY_SET, DPF_RX_QNO_DFT);
+
+ if (intr_status & DP_DL_INT_MTU_ERR_MSK)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_MTU_ERR, DPF_RX_QNO_DFT);
+
+ if (intr_status & DP_DL_INT_FRG_LEN_ERR_MSK)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_FRGCNT_LEN_ERR, DPF_RX_QNO_DFT);
+
+ if (intr_status & DP_DL_INT_Q0_PITCNT_LEN_ERR) {
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_Q0_PITCNT_LEN_ERR, BIT(qno));
+ t7xx_dpmaif_dlq_mask_rx_pitcnt_len_err_intr(hw_info, qno);
+ }
+
+ if (intr_status & DP_DL_INT_HPC_ENT_TYPE_ERR)
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_HPC_ENT_TYPE_ERR,
+ DPF_RX_QNO_DFT);
+
+ if (intr_status & DP_DL_INT_Q0_DONE) {
+ /* Mask RX done interrupt immediately after it occurs, do not clear
+ * the interrupt if the mask operation fails.
+ */
+ if (!t7xx_mask_dlq_intr(hw_info, qno))
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_Q0_DONE, BIT(qno));
+ else
+ intr_status &= ~DP_DL_INT_Q0_DONE;
+ }
+ } else {
+ if (intr_status & DP_DL_INT_Q1_PITCNT_LEN_ERR) {
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_Q1_PITCNT_LEN_ERR, BIT(qno));
+ t7xx_dpmaif_dlq_mask_rx_pitcnt_len_err_intr(hw_info, qno);
+ }
+
+ if (intr_status & DP_DL_INT_Q1_DONE) {
+ if (!t7xx_mask_dlq_intr(hw_info, qno))
+ t7xx_dpmaif_set_intr_para(para, DPF_INTR_DL_Q1_DONE, BIT(qno));
+ else
+ intr_status &= ~DP_DL_INT_Q1_DONE;
+ }
+ }
+
+ intr_status |= DP_DL_INT_BATCNT_LEN_ERR;
+ /* Clear interrupt status */
+ iowrite32(intr_status, hw_info->pcie_base + DPMAIF_AP_APDL_L2TISAR0);
+}
+
+/**
+ * t7xx_dpmaif_hw_get_intr_cnt() - Reads interrupt status and count from HW.
+ * @hw_info: Pointer to struct hw_info.
+ * @para: Pointer to struct dpmaif_hw_intr_st_para.
+ * @qno: Queue number.
+ *
+ * Reads RX/TX interrupt status from HW and clears UL/DL status as needed.
+ *
+ * Return: Interrupt count.
+ */
+int t7xx_dpmaif_hw_get_intr_cnt(struct dpmaif_hw_info *hw_info,
+ struct dpmaif_hw_intr_st_para *para, int qno)
+{
+ u32 rx_intr_status, tx_intr_status = 0;
+ u32 rx_intr_qdone, tx_intr_qdone = 0;
+
+ rx_intr_status = ioread32(hw_info->pcie_base + DPMAIF_AP_APDL_L2TISAR0);
+ rx_intr_qdone = ioread32(hw_info->pcie_base + DPMAIF_AO_UL_APDL_L2TIMR0);
+
+ /* TX interrupt status */
+ if (qno == DPF_RX_QNO_DFT) {
+ /* All ULQ and DLQ0 interrupts use the same source no need to check ULQ interrupts
+ * when a DLQ1 interrupt has occurred.
+ */
+ tx_intr_status = ioread32(hw_info->pcie_base + DPMAIF_AP_L2TISAR0);
+ tx_intr_qdone = ioread32(hw_info->pcie_base + DPMAIF_AO_UL_AP_L2TIMR0);
+ }
+
+ t7xx_dpmaif_clr_ip_busy_sts(hw_info);
+
+ if (qno == DPF_RX_QNO_DFT) {
+ /* Do not schedule bottom half again or clear UL interrupt status when we
+ * have already masked it.
+ */
+ tx_intr_status &= ~tx_intr_qdone;
+ if (tx_intr_status)
+ t7xx_dpmaif_hw_check_tx_intr(hw_info, tx_intr_status, para);
+ }
+
+ if (rx_intr_status) {
+ if (qno == DPF_RX_QNO0) {
+ rx_intr_status &= DP_DL_Q0_STATUS_MASK;
+ if (rx_intr_qdone & DPMAIF_DL_INT_DLQ0_QDONE)
+ /* Do not schedule bottom half again or clear DL
+ * queue done interrupt status when we have already masked it.
+ */
+ rx_intr_status &= ~DP_DL_INT_Q0_DONE;
+ } else {
+ rx_intr_status &= DP_DL_Q1_STATUS_MASK;
+ if (rx_intr_qdone & DPMAIF_DL_INT_DLQ1_QDONE)
+ rx_intr_status &= ~DP_DL_INT_Q1_DONE;
+ }
+
+ if (rx_intr_status)
+ t7xx_dpmaif_hw_check_rx_intr(hw_info, rx_intr_status, para, qno);
+ }
+
+ return para->intr_cnt;
+}
+
+static int t7xx_dpmaif_sram_init(struct dpmaif_hw_info *hw_info)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AP_MEM_CLR);
+ value |= DPMAIF_MEM_CLR;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AP_MEM_CLR);
+
+ return ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_AP_MEM_CLR,
+ value, !(value & DPMAIF_MEM_CLR), 0,
+ DPMAIF_CHECK_INIT_TIMEOUT_US);
+}
+
+static void t7xx_dpmaif_hw_reset(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_AP_AO_RST_BIT, hw_info->pcie_base + DPMAIF_AP_AO_RGU_ASSERT);
+ udelay(2);
+ iowrite32(DPMAIF_AP_RST_BIT, hw_info->pcie_base + DPMAIF_AP_RGU_ASSERT);
+ udelay(2);
+ iowrite32(DPMAIF_AP_AO_RST_BIT, hw_info->pcie_base + DPMAIF_AP_AO_RGU_DEASSERT);
+ udelay(2);
+ iowrite32(DPMAIF_AP_RST_BIT, hw_info->pcie_base + DPMAIF_AP_RGU_DEASSERT);
+ udelay(2);
+}
+
+static int t7xx_dpmaif_hw_config(struct dpmaif_hw_info *hw_info)
+{
+ u32 ap_port_mode;
+ int ret;
+
+ t7xx_dpmaif_hw_reset(hw_info);
+
+ ret = t7xx_dpmaif_sram_init(hw_info);
+ if (ret)
+ return ret;
+
+ ap_port_mode = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+ ap_port_mode |= DPMAIF_PORT_MODE_PCIE;
+ iowrite32(ap_port_mode, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+ iowrite32(DPMAIF_CG_EN, hw_info->pcie_base + DPMAIF_AP_CG_EN);
+ return 0;
+}
+
+static void t7xx_dpmaif_pcie_dpmaif_sign(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_PCIE_MODE_SET_VALUE, hw_info->pcie_base + DPMAIF_UL_RESERVE_AO_RW);
+}
+
+static void t7xx_dpmaif_dl_performance(struct dpmaif_hw_info *hw_info)
+{
+ u32 enable_bat_cache, enable_pit_burst;
+
+ enable_bat_cache = ioread32(hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+ enable_bat_cache |= DPMAIF_DL_BAT_CACHE_PRI;
+ iowrite32(enable_bat_cache, hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+
+ enable_pit_burst = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+ enable_pit_burst |= DPMAIF_DL_BURST_PIT_EN;
+ iowrite32(enable_pit_burst, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+}
+
+ /* DPMAIF DL DLQ part HW setting */
+
+static void t7xx_dpmaif_hw_hpc_cntl_set(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = DPMAIF_HPC_DLQ_PATH_MODE | DPMAIF_HPC_ADD_MODE_DF << 2;
+ value |= DPMAIF_HASH_PRIME_DF << 4;
+ value |= DPMAIF_HPC_TOTAL_NUM << 8;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_HPC_CNTL);
+}
+
+static void t7xx_dpmaif_hw_agg_cfg_set(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = DPMAIF_AGG_MAX_LEN_DF | DPMAIF_AGG_TBL_ENT_NUM_DF << 16;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_DLQ_AGG_CFG);
+}
+
+static void t7xx_dpmaif_hw_hash_bit_choose_set(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_DLQ_HASH_BIT_CHOOSE_DF,
+ hw_info->pcie_base + DPMAIF_AO_DL_DLQPIT_INIT_CON5);
+}
+
+static void t7xx_dpmaif_hw_mid_pit_timeout_thres_set(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_MID_TIMEOUT_THRES_DF, hw_info->pcie_base + DPMAIF_AO_DL_DLQPIT_TIMEOUT0);
+}
+
+static void t7xx_dpmaif_hw_dlq_timeout_thres_set(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value, i;
+
+ /* Each register holds two DLQ threshold timeout values */
+ for (i = 0; i < DPMAIF_HPC_MAX_TOTAL_NUM / 2; i++) {
+ value = FIELD_PREP(DPMAIF_DLQ_LOW_TIMEOUT_THRES_MKS, DPMAIF_DLQ_TIMEOUT_THRES_DF);
+ value |= FIELD_PREP(DPMAIF_DLQ_HIGH_TIMEOUT_THRES_MSK,
+ DPMAIF_DLQ_TIMEOUT_THRES_DF);
+ iowrite32(value,
+ hw_info->pcie_base + DPMAIF_AO_DL_DLQPIT_TIMEOUT1 + sizeof(u32) * i);
+ }
+}
+
+static void t7xx_dpmaif_hw_dlq_start_prs_thres_set(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_DLQ_PRS_THRES_DF, hw_info->pcie_base + DPMAIF_AO_DL_DLQPIT_TRIG_THRES);
+}
+
+static void t7xx_dpmaif_dl_dlq_hpc_hw_init(struct dpmaif_hw_info *hw_info)
+{
+ t7xx_dpmaif_hw_hpc_cntl_set(hw_info);
+ t7xx_dpmaif_hw_agg_cfg_set(hw_info);
+ t7xx_dpmaif_hw_hash_bit_choose_set(hw_info);
+ t7xx_dpmaif_hw_mid_pit_timeout_thres_set(hw_info);
+ t7xx_dpmaif_hw_dlq_timeout_thres_set(hw_info);
+ t7xx_dpmaif_hw_dlq_start_prs_thres_set(hw_info);
+}
+
+static int t7xx_dpmaif_dl_bat_init_done(struct dpmaif_hw_info *hw_info, bool frg_en)
+{
+ u32 value, dl_bat_init = 0;
+ int ret;
+
+ if (frg_en)
+ dl_bat_init = DPMAIF_DL_BAT_FRG_INIT;
+
+ dl_bat_init |= DPMAIF_DL_BAT_INIT_ALLSET;
+ dl_bat_init |= DPMAIF_DL_BAT_INIT_EN;
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_BAT_INIT,
+ value, !(value & DPMAIF_DL_BAT_INIT_NOT_READY), 0,
+ DPMAIF_CHECK_INIT_TIMEOUT_US);
+ if (ret) {
+ dev_err(hw_info->dev, "Data plane modem DL BAT is not ready\n");
+ return ret;
+ }
+
+ iowrite32(dl_bat_init, hw_info->pcie_base + DPMAIF_DL_BAT_INIT);
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_BAT_INIT,
+ value, !(value & DPMAIF_DL_BAT_INIT_NOT_READY), 0,
+ DPMAIF_CHECK_INIT_TIMEOUT_US);
+ if (ret)
+ dev_err(hw_info->dev, "Data plane modem DL BAT initialization failed\n");
+
+ return ret;
+}
+
+static void t7xx_dpmaif_dl_set_bat_base_addr(struct dpmaif_hw_info *hw_info,
+ dma_addr_t addr)
+{
+ iowrite32(lower_32_bits(addr), hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON0);
+ iowrite32(upper_32_bits(addr), hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON3);
+}
+
+static void t7xx_dpmaif_dl_set_bat_size(struct dpmaif_hw_info *hw_info, unsigned int size)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+ value &= ~DPMAIF_BAT_SIZE_MSK;
+ value |= size & DPMAIF_BAT_SIZE_MSK;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+}
+
+static void t7xx_dpmaif_dl_bat_en(struct dpmaif_hw_info *hw_info, bool enable)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+
+ if (enable)
+ value |= DPMAIF_BAT_EN_MSK;
+ else
+ value &= ~DPMAIF_BAT_EN_MSK;
+
+ iowrite32(value, hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+}
+
+static void t7xx_dpmaif_dl_set_ao_bid_maxcnt(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON0);
+ value &= ~DPMAIF_BAT_BID_MAXCNT_MSK;
+ value |= FIELD_PREP(DPMAIF_BAT_BID_MAXCNT_MSK, DPMAIF_HW_PKT_BIDCNT);
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON0);
+}
+
+static void t7xx_dpmaif_dl_set_ao_mtu(struct dpmaif_hw_info *hw_info)
+{
+ iowrite32(DPMAIF_HW_MTU_SIZE, hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON1);
+}
+
+static void t7xx_dpmaif_dl_set_ao_pit_chknum(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON2);
+ value &= ~DPMAIF_PIT_CHK_NUM_MSK;
+ value |= FIELD_PREP(DPMAIF_PIT_CHK_NUM_MSK, DPMAIF_HW_CHK_PIT_NUM);
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON2);
+}
+
+static void t7xx_dpmaif_dl_set_ao_remain_minsz(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON0);
+ value &= ~DPMAIF_BAT_REMAIN_MINSZ_MSK;
+ value |= FIELD_PREP(DPMAIF_BAT_REMAIN_MINSZ_MSK,
+ DPMAIF_HW_BAT_REMAIN / DPMAIF_BAT_REMAIN_SZ_BASE);
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON0);
+}
+
+static void t7xx_dpmaif_dl_set_ao_bat_bufsz(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON2);
+ value &= ~DPMAIF_BAT_BUF_SZ_MSK;
+ value |= FIELD_PREP(DPMAIF_BAT_BUF_SZ_MSK,
+ DPMAIF_HW_BAT_PKTBUF / DPMAIF_BAT_BUFFER_SZ_BASE);
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON2);
+}
+
+static void t7xx_dpmaif_dl_set_ao_bat_rsv_length(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON2);
+ value &= ~DPMAIF_BAT_RSV_LEN_MSK;
+ value |= DPMAIF_HW_BAT_RSVLEN;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_PKTINFO_CON2);
+}
+
+static void t7xx_dpmaif_dl_set_pkt_alignment(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+ value &= ~DPMAIF_PKT_ALIGN_MSK;
+ value |= DPMAIF_PKT_ALIGN_EN;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+}
+
+static void t7xx_dpmaif_dl_set_pkt_checksum(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+ value |= DPMAIF_DL_PKT_CHECKSUM_EN;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+}
+
+static void t7xx_dpmaif_dl_set_ao_frg_check_thres(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_FRG_THRES);
+ value &= ~DPMAIF_FRG_CHECK_THRES_MSK;
+ value |= DPMAIF_HW_CHK_FRG_NUM;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_FRG_THRES);
+}
+
+static void t7xx_dpmaif_dl_set_ao_frg_bufsz(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_FRG_THRES);
+ value &= ~DPMAIF_FRG_BUF_SZ_MSK;
+ value |= FIELD_PREP(DPMAIF_FRG_BUF_SZ_MSK,
+ DPMAIF_HW_FRG_PKTBUF / DPMAIF_FRG_BUFFER_SZ_BASE);
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_FRG_THRES);
+}
+
+static void t7xx_dpmaif_dl_frg_ao_en(struct dpmaif_hw_info *hw_info, bool enable)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_FRG_THRES);
+
+ if (enable)
+ value |= DPMAIF_FRG_EN_MSK;
+ else
+ value &= ~DPMAIF_FRG_EN_MSK;
+
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_FRG_THRES);
+}
+
+static void t7xx_dpmaif_dl_set_ao_bat_check_thres(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+ value &= ~DPMAIF_BAT_CHECK_THRES_MSK;
+ value |= FIELD_PREP(DPMAIF_BAT_CHECK_THRES_MSK, DPMAIF_HW_CHK_BAT_NUM);
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_RDY_CHK_THRES);
+}
+
+static void t7xx_dpmaif_dl_set_pit_seqnum(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PIT_SEQ_END);
+ value &= ~DPMAIF_DL_PIT_SEQ_MSK;
+ value |= DPMAIF_DL_PIT_SEQ_VALUE;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_DL_PIT_SEQ_END);
+}
+
+static void t7xx_dpmaif_dl_set_dlq_pit_base_addr(struct dpmaif_hw_info *hw_info,
+ dma_addr_t addr)
+{
+ iowrite32(lower_32_bits(addr), hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON0);
+ iowrite32(upper_32_bits(addr), hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON4);
+}
+
+static void t7xx_dpmaif_dl_set_dlq_pit_size(struct dpmaif_hw_info *hw_info, unsigned int size)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON1);
+ value &= ~DPMAIF_PIT_SIZE_MSK;
+ value |= size & DPMAIF_PIT_SIZE_MSK;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON1);
+ iowrite32(0, hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON2);
+ iowrite32(0, hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON3);
+ iowrite32(0, hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON5);
+ iowrite32(0, hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON6);
+}
+
+static void t7xx_dpmaif_dl_dlq_pit_en(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON3);
+ value |= DPMAIF_DLQPIT_EN_MSK;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT_CON3);
+}
+
+static void t7xx_dpmaif_dl_dlq_pit_init_done(struct dpmaif_hw_info *hw_info,
+ unsigned int pit_idx)
+{
+ unsigned int dl_pit_init;
+ int timeout;
+ u32 value;
+
+ dl_pit_init = DPMAIF_DL_PIT_INIT_ALLSET;
+ dl_pit_init |= (pit_idx << DPMAIF_DLQPIT_CHAN_OFS);
+ dl_pit_init |= DPMAIF_DL_PIT_INIT_EN;
+
+ timeout = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT,
+ value, !(value & DPMAIF_DL_PIT_INIT_NOT_READY),
+ DPMAIF_CHECK_DELAY_US,
+ DPMAIF_CHECK_INIT_TIMEOUT_US);
+ if (timeout) {
+ dev_err(hw_info->dev, "Data plane modem DL PIT is not ready\n");
+ return;
+ }
+
+ iowrite32(dl_pit_init, hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT);
+ timeout = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_DLQPIT_INIT,
+ value, !(value & DPMAIF_DL_PIT_INIT_NOT_READY),
+ DPMAIF_CHECK_DELAY_US,
+ DPMAIF_CHECK_INIT_TIMEOUT_US);
+ if (timeout)
+ dev_err(hw_info->dev, "Data plane modem DL PIT initialization failed\n");
+}
+
+static void t7xx_dpmaif_config_dlq_pit_hw(struct dpmaif_hw_info *hw_info, unsigned int q_num,
+ struct dpmaif_dl *dl_que)
+{
+ t7xx_dpmaif_dl_set_dlq_pit_base_addr(hw_info, dl_que->pit_base);
+ t7xx_dpmaif_dl_set_dlq_pit_size(hw_info, dl_que->pit_size_cnt);
+ t7xx_dpmaif_dl_dlq_pit_en(hw_info);
+ t7xx_dpmaif_dl_dlq_pit_init_done(hw_info, q_num);
+}
+
+static void t7xx_dpmaif_config_all_dlq_hw(struct dpmaif_hw_info *hw_info)
+{
+ int i;
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++)
+ t7xx_dpmaif_config_dlq_pit_hw(hw_info, i, &hw_info->dl_que[i]);
+}
+
+static void t7xx_dpmaif_dl_all_q_en(struct dpmaif_hw_info *hw_info, bool enable)
+{
+ u32 dl_bat_init, value;
+ int timeout;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+
+ if (enable)
+ value |= DPMAIF_BAT_EN_MSK;
+ else
+ value &= ~DPMAIF_BAT_EN_MSK;
+
+ iowrite32(value, hw_info->pcie_base + DPMAIF_DL_BAT_INIT_CON1);
+ dl_bat_init = DPMAIF_DL_BAT_INIT_ONLY_ENABLE_BIT;
+ dl_bat_init |= DPMAIF_DL_BAT_INIT_EN;
+
+ timeout = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_BAT_INIT,
+ value, !(value & DPMAIF_DL_BAT_INIT_NOT_READY), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (timeout)
+ dev_err(hw_info->dev, "Timeout updating BAT setting to HW\n");
+
+ iowrite32(dl_bat_init, hw_info->pcie_base + DPMAIF_DL_BAT_INIT);
+ timeout = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_BAT_INIT,
+ value, !(value & DPMAIF_DL_BAT_INIT_NOT_READY), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (timeout)
+ dev_err(hw_info->dev, "Data plane modem DL BAT is not ready\n");
+}
+
+static int t7xx_dpmaif_config_dlq_hw(struct dpmaif_hw_info *hw_info)
+{
+ struct dpmaif_dl *dl_que;
+ int ret;
+
+ t7xx_dpmaif_dl_dlq_hpc_hw_init(hw_info);
+
+ dl_que = &hw_info->dl_que[0]; /* All queues share one BAT/frag BAT table */
+ if (!dl_que->que_started)
+ return -EBUSY;
+
+ t7xx_dpmaif_dl_set_ao_remain_minsz(hw_info);
+ t7xx_dpmaif_dl_set_ao_bat_bufsz(hw_info);
+ t7xx_dpmaif_dl_set_ao_frg_bufsz(hw_info);
+ t7xx_dpmaif_dl_set_ao_bat_rsv_length(hw_info);
+ t7xx_dpmaif_dl_set_ao_bid_maxcnt(hw_info);
+ t7xx_dpmaif_dl_set_pkt_alignment(hw_info);
+ t7xx_dpmaif_dl_set_pit_seqnum(hw_info);
+ t7xx_dpmaif_dl_set_ao_mtu(hw_info);
+ t7xx_dpmaif_dl_set_ao_pit_chknum(hw_info);
+ t7xx_dpmaif_dl_set_ao_bat_check_thres(hw_info);
+ t7xx_dpmaif_dl_set_ao_frg_check_thres(hw_info);
+ t7xx_dpmaif_dl_frg_ao_en(hw_info, true);
+
+ t7xx_dpmaif_dl_set_bat_base_addr(hw_info, dl_que->frg_base);
+ t7xx_dpmaif_dl_set_bat_size(hw_info, dl_que->frg_size_cnt);
+ t7xx_dpmaif_dl_bat_en(hw_info, true);
+
+ ret = t7xx_dpmaif_dl_bat_init_done(hw_info, true);
+ if (ret)
+ return ret;
+
+ t7xx_dpmaif_dl_set_bat_base_addr(hw_info, dl_que->bat_base);
+ t7xx_dpmaif_dl_set_bat_size(hw_info, dl_que->bat_size_cnt);
+ t7xx_dpmaif_dl_bat_en(hw_info, false);
+
+ ret = t7xx_dpmaif_dl_bat_init_done(hw_info, false);
+ if (ret)
+ return ret;
+
+ /* Init PIT (two PIT table) */
+ t7xx_dpmaif_config_all_dlq_hw(hw_info);
+ t7xx_dpmaif_dl_all_q_en(hw_info, true);
+ t7xx_dpmaif_dl_set_pkt_checksum(hw_info);
+ return 0;
+}
+
+static void t7xx_dpmaif_ul_update_drb_size(struct dpmaif_hw_info *hw_info,
+ unsigned int q_num, unsigned int size)
+{
+ unsigned int value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_UL_DRBSIZE_ADDRH_n(q_num));
+ value &= ~DPMAIF_DRB_SIZE_MSK;
+ value |= size & DPMAIF_DRB_SIZE_MSK;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_UL_DRBSIZE_ADDRH_n(q_num));
+}
+
+static void t7xx_dpmaif_ul_update_drb_base_addr(struct dpmaif_hw_info *hw_info,
+ unsigned int q_num, dma_addr_t addr)
+{
+ iowrite32(lower_32_bits(addr), hw_info->pcie_base + DPMAIF_ULQSAR_n(q_num));
+ iowrite32(upper_32_bits(addr), hw_info->pcie_base + DPMAIF_UL_DRB_ADDRH_n(q_num));
+}
+
+static void t7xx_dpmaif_ul_rdy_en(struct dpmaif_hw_info *hw_info,
+ unsigned int q_num, bool ready)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_UL_CHNL_ARB0);
+
+ if (ready)
+ value |= BIT(q_num);
+ else
+ value &= ~BIT(q_num);
+
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_UL_CHNL_ARB0);
+}
+
+static void t7xx_dpmaif_ul_arb_en(struct dpmaif_hw_info *hw_info,
+ unsigned int q_num, bool enable)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_UL_CHNL_ARB0);
+
+ if (enable)
+ value |= BIT(q_num + 8);
+ else
+ value &= ~BIT(q_num + 8);
+
+ iowrite32(value, hw_info->pcie_base + DPMAIF_AO_UL_CHNL_ARB0);
+}
+
+static void t7xx_dpmaif_config_ulq_hw(struct dpmaif_hw_info *hw_info)
+{
+ struct dpmaif_ul *ul_que;
+ int i;
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+ ul_que = &hw_info->ul_que[i];
+ if (ul_que->que_started) {
+ t7xx_dpmaif_ul_update_drb_size(hw_info, i, ul_que->drb_size_cnt *
+ DPMAIF_UL_DRB_SIZE_WORD);
+ t7xx_dpmaif_ul_update_drb_base_addr(hw_info, i, ul_que->drb_base);
+ t7xx_dpmaif_ul_rdy_en(hw_info, i, true);
+ t7xx_dpmaif_ul_arb_en(hw_info, i, true);
+ } else {
+ t7xx_dpmaif_ul_arb_en(hw_info, i, false);
+ }
+ }
+}
+
+static int t7xx_dpmaif_hw_init_done(struct dpmaif_hw_info *hw_info)
+{
+ u32 ap_cfg;
+ int ret;
+
+ ap_cfg = ioread32(hw_info->pcie_base + DPMAIF_AP_OVERWRITE_CFG);
+ ap_cfg |= DPMAIF_SRAM_SYNC;
+ iowrite32(ap_cfg, hw_info->pcie_base + DPMAIF_AP_OVERWRITE_CFG);
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_AP_OVERWRITE_CFG,
+ ap_cfg, !(ap_cfg & DPMAIF_SRAM_SYNC), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (ret)
+ return ret;
+
+ iowrite32(DPMAIF_UL_INIT_DONE, hw_info->pcie_base + DPMAIF_AO_UL_INIT_SET);
+ iowrite32(DPMAIF_DL_INIT_DONE, hw_info->pcie_base + DPMAIF_AO_DL_INIT_SET);
+ return 0;
+}
+
+static bool t7xx_dpmaif_dl_idle_check(struct dpmaif_hw_info *hw_info)
+{
+ u32 dpmaif_dl_is_busy = ioread32(hw_info->pcie_base + DPMAIF_DL_CHK_BUSY);
+
+ return !(dpmaif_dl_is_busy & DPMAIF_DL_IDLE_STS);
+}
+
+static void t7xx_dpmaif_ul_all_q_en(struct dpmaif_hw_info *hw_info, bool enable)
+{
+ u32 ul_arb_en = ioread32(hw_info->pcie_base + DPMAIF_AO_UL_CHNL_ARB0);
+
+ if (enable)
+ ul_arb_en |= DPMAIF_UL_ALL_QUE_ARB_EN;
+ else
+ ul_arb_en &= ~DPMAIF_UL_ALL_QUE_ARB_EN;
+
+ iowrite32(ul_arb_en, hw_info->pcie_base + DPMAIF_AO_UL_CHNL_ARB0);
+}
+
+static bool t7xx_dpmaif_ul_idle_check(struct dpmaif_hw_info *hw_info)
+{
+ u32 dpmaif_ul_is_busy = ioread32(hw_info->pcie_base + DPMAIF_UL_CHK_BUSY);
+
+ return !(dpmaif_ul_is_busy & DPMAIF_UL_IDLE_STS);
+}
+
+void t7xx_dpmaif_ul_update_hw_drb_cnt(struct dpmaif_hw_info *hw_info, unsigned int q_num,
+ unsigned int drb_entry_cnt)
+{
+ u32 ul_update, value;
+ int err;
+
+ ul_update = drb_entry_cnt & DPMAIF_UL_ADD_COUNT_MASK;
+ ul_update |= DPMAIF_UL_ADD_UPDATE;
+
+ err = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_ULQ_ADD_DESC_CH_n(q_num),
+ value, !(value & DPMAIF_UL_ADD_NOT_READY), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (err) {
+ dev_err(hw_info->dev, "UL add is not ready\n");
+ return;
+ }
+
+ iowrite32(ul_update, hw_info->pcie_base + DPMAIF_ULQ_ADD_DESC_CH_n(q_num));
+
+ err = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_ULQ_ADD_DESC_CH_n(q_num),
+ value, !(value & DPMAIF_UL_ADD_NOT_READY), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (err)
+ dev_err(hw_info->dev, "Timeout updating UL add\n");
+}
+
+unsigned int t7xx_dpmaif_ul_get_rd_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num)
+{
+ unsigned int value = ioread32(hw_info->pcie_base + DPMAIF_ULQ_STA0_n(q_num));
+
+ return FIELD_GET(DPMAIF_UL_DRB_RIDX_MSK, value) / DPMAIF_UL_DRB_SIZE_WORD;
+}
+
+int t7xx_dpmaif_dlq_add_pit_remain_cnt(struct dpmaif_hw_info *hw_info, unsigned int dlq_pit_idx,
+ unsigned int pit_remain_cnt)
+{
+ u32 dl_update, value;
+ int ret;
+
+ dl_update = pit_remain_cnt & DPMAIF_PIT_REM_CNT_MSK;
+ dl_update |= DPMAIF_DL_ADD_UPDATE | (dlq_pit_idx << DPMAIF_ADD_DLQ_PIT_CHAN_OFS);
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_DLQPIT_ADD,
+ value, !(value & DPMAIF_DL_ADD_NOT_READY), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (ret) {
+ dev_err(hw_info->dev, "Data plane modem is not ready to add dlq\n");
+ return ret;
+ }
+
+ iowrite32(dl_update, hw_info->pcie_base + DPMAIF_DL_DLQPIT_ADD);
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_DLQPIT_ADD,
+ value, !(value & DPMAIF_DL_ADD_NOT_READY), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ if (ret) {
+ dev_err(hw_info->dev, "Data plane modem add dlq failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+unsigned int t7xx_dpmaif_dl_dlq_pit_get_wr_idx(struct dpmaif_hw_info *hw_info,
+ unsigned int dlq_pit_idx)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_DLQ_WR_IDX +
+ dlq_pit_idx * DLQ_PIT_IDX_SIZE);
+ return value & DPMAIF_DL_RD_WR_IDX_MSK;
+}
+
+static bool t7xx_dl_add_timedout(struct dpmaif_hw_info *hw_info)
+{
+ u32 value;
+ int ret;
+
+ ret = ioread32_poll_timeout_atomic(hw_info->pcie_base + DPMAIF_DL_BAT_ADD,
+ value, !(value & DPMAIF_DL_ADD_NOT_READY), 0,
+ DPMAIF_CHECK_TIMEOUT_US);
+ return ret;
+}
+
+int t7xx_dpmaif_dl_snd_hw_bat_cnt(struct dpmaif_hw_info *hw_info, unsigned int bat_entry_cnt)
+{
+ unsigned int value;
+
+ if (t7xx_dl_add_timedout(hw_info)) {
+ dev_err(hw_info->dev, "DL add BAT not ready\n");
+ return -EBUSY;
+ }
+
+ value = bat_entry_cnt & DPMAIF_DL_ADD_COUNT_MASK;
+ value |= DPMAIF_DL_ADD_UPDATE;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_DL_BAT_ADD);
+
+ if (t7xx_dl_add_timedout(hw_info)) {
+ dev_err(hw_info->dev, "DL add BAT timeout\n");
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+unsigned int t7xx_dpmaif_dl_get_bat_rd_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_BAT_RD_IDX);
+ return value & DPMAIF_DL_RD_WR_IDX_MSK;
+}
+
+unsigned int t7xx_dpmaif_dl_get_bat_wr_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_BAT_WR_IDX);
+ return value & DPMAIF_DL_RD_WR_IDX_MSK;
+}
+
+int t7xx_dpmaif_dl_snd_hw_frg_cnt(struct dpmaif_hw_info *hw_info, unsigned int frg_entry_cnt)
+{
+ unsigned int value;
+
+ if (t7xx_dl_add_timedout(hw_info)) {
+ dev_err(hw_info->dev, "Data plane modem is not ready to add frag DLQ\n");
+ return -EBUSY;
+ }
+
+ value = frg_entry_cnt & DPMAIF_DL_ADD_COUNT_MASK;
+ value |= DPMAIF_DL_FRG_ADD_UPDATE | DPMAIF_DL_ADD_UPDATE;
+ iowrite32(value, hw_info->pcie_base + DPMAIF_DL_BAT_ADD);
+
+ if (t7xx_dl_add_timedout(hw_info)) {
+ dev_err(hw_info->dev, "Data plane modem add frag DLQ failed");
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+unsigned int t7xx_dpmaif_dl_get_frg_rd_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num)
+{
+ u32 value;
+
+ value = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_FRGBAT_RD_IDX);
+ return value & DPMAIF_DL_RD_WR_IDX_MSK;
+}
+
+static void t7xx_dpmaif_set_queue_property(struct dpmaif_hw_info *hw_info,
+ struct dpmaif_hw_params *init_para)
+{
+ struct dpmaif_dl *dl_que;
+ struct dpmaif_ul *ul_que;
+ int i;
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
+ dl_que = &hw_info->dl_que[i];
+ dl_que->bat_base = init_para->pkt_bat_base_addr[i];
+ dl_que->bat_size_cnt = init_para->pkt_bat_size_cnt[i];
+ dl_que->pit_base = init_para->pit_base_addr[i];
+ dl_que->pit_size_cnt = init_para->pit_size_cnt[i];
+ dl_que->frg_base = init_para->frg_bat_base_addr[i];
+ dl_que->frg_size_cnt = init_para->frg_bat_size_cnt[i];
+ dl_que->que_started = true;
+ }
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+ ul_que = &hw_info->ul_que[i];
+ ul_que->drb_base = init_para->drb_base_addr[i];
+ ul_que->drb_size_cnt = init_para->drb_size_cnt[i];
+ ul_que->que_started = true;
+ }
+}
+
+/**
+ * t7xx_dpmaif_hw_stop_all_txq() - Stop all TX queues.
+ * @hw_info: Pointer to struct hw_info.
+ *
+ * Disable HW UL queues. Checks busy UL queues to go to idle
+ * with an attempt count of 1000000.
+ *
+ * Return:
+ * * 0 - Success
+ * * -ETIMEDOUT - Timed out checking busy queues
+ */
+int t7xx_dpmaif_hw_stop_all_txq(struct dpmaif_hw_info *hw_info)
+{
+ int count = 0;
+
+ t7xx_dpmaif_ul_all_q_en(hw_info, false);
+ while (t7xx_dpmaif_ul_idle_check(hw_info)) {
+ if (++count >= DPMAIF_MAX_CHECK_COUNT) {
+ dev_err(hw_info->dev, "Failed to stop TX, status: 0x%x\n",
+ ioread32(hw_info->pcie_base + DPMAIF_UL_CHK_BUSY));
+ return -ETIMEDOUT;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * t7xx_dpmaif_hw_stop_all_rxq() - Stop all RX queues.
+ * @hw_info: Pointer to struct hw_info.
+ *
+ * Disable HW DL queue. Checks busy UL queues to go to idle
+ * with an attempt count of 1000000.
+ * Check that HW PIT write index equals read index with the same
+ * attempt count.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ETIMEDOUT - Timed out checking busy queues.
+ */
+int t7xx_dpmaif_hw_stop_all_rxq(struct dpmaif_hw_info *hw_info)
+{
+ unsigned int wr_idx, rd_idx;
+ int count = 0;
+
+ t7xx_dpmaif_dl_all_q_en(hw_info, false);
+ while (t7xx_dpmaif_dl_idle_check(hw_info)) {
+ if (++count >= DPMAIF_MAX_CHECK_COUNT) {
+ dev_err(hw_info->dev, "Failed to stop RX, status: 0x%x\n",
+ ioread32(hw_info->pcie_base + DPMAIF_DL_CHK_BUSY));
+ return -ETIMEDOUT;
+ }
+ }
+
+ /* Check middle PIT sync done */
+ count = 0;
+ do {
+ wr_idx = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PIT_WR_IDX);
+ wr_idx &= DPMAIF_DL_RD_WR_IDX_MSK;
+ rd_idx = ioread32(hw_info->pcie_base + DPMAIF_AO_DL_PIT_RD_IDX);
+ rd_idx &= DPMAIF_DL_RD_WR_IDX_MSK;
+
+ if (wr_idx == rd_idx)
+ return 0;
+ } while (++count < DPMAIF_MAX_CHECK_COUNT);
+
+ dev_err(hw_info->dev, "Check middle PIT sync fail\n");
+ return -ETIMEDOUT;
+}
+
+void t7xx_dpmaif_start_hw(struct dpmaif_hw_info *hw_info)
+{
+ t7xx_dpmaif_ul_all_q_en(hw_info, true);
+ t7xx_dpmaif_dl_all_q_en(hw_info, true);
+}
+
+/**
+ * t7xx_dpmaif_hw_init() - Initialize HW data path API.
+ * @hw_info: Pointer to struct hw_info.
+ * @init_param: Pointer to struct dpmaif_hw_params.
+ *
+ * Configures port mode, clock config, HW interrupt initialization, and HW queue.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ERROR - Error code from failure sub-initializations.
+ */
+int t7xx_dpmaif_hw_init(struct dpmaif_hw_info *hw_info, struct dpmaif_hw_params *init_param)
+{
+ int ret;
+
+ ret = t7xx_dpmaif_hw_config(hw_info);
+ if (ret) {
+ dev_err(hw_info->dev, "DPMAIF HW config failed\n");
+ return ret;
+ }
+
+ ret = t7xx_dpmaif_init_intr(hw_info);
+ if (ret) {
+ dev_err(hw_info->dev, "DPMAIF HW interrupts init failed\n");
+ return ret;
+ }
+
+ t7xx_dpmaif_set_queue_property(hw_info, init_param);
+ t7xx_dpmaif_pcie_dpmaif_sign(hw_info);
+ t7xx_dpmaif_dl_performance(hw_info);
+
+ ret = t7xx_dpmaif_config_dlq_hw(hw_info);
+ if (ret) {
+ dev_err(hw_info->dev, "DPMAIF HW dlq config failed\n");
+ return ret;
+ }
+
+ t7xx_dpmaif_config_ulq_hw(hw_info);
+
+ ret = t7xx_dpmaif_hw_init_done(hw_info);
+ if (ret)
+ dev_err(hw_info->dev, "DPMAIF HW queue init failed\n");
+
+ return ret;
+}
+
+bool t7xx_dpmaif_ul_clr_done(struct dpmaif_hw_info *hw_info, unsigned int qno)
+{
+ u32 intr_status;
+
+ intr_status = ioread32(hw_info->pcie_base + DPMAIF_AP_L2TISAR0);
+ intr_status &= BIT(DP_UL_INT_DONE_OFFSET + qno);
+ if (intr_status) {
+ iowrite32(intr_status, hw_info->pcie_base + DPMAIF_AP_L2TISAR0);
+ return true;
+ }
+
+ return false;
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_dpmaif.h b/drivers/net/wwan/t7xx/t7xx_dpmaif.h
new file mode 100644
index 000000000000..ae292355a33d
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_dpmaif.h
@@ -0,0 +1,179 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_DPMAIF_H__
+#define __T7XX_DPMAIF_H__
+
+#include <linux/bits.h>
+#include <linux/types.h>
+
+#define DPMAIF_DL_PIT_SEQ_VALUE 251
+#define DPMAIF_UL_DRB_SIZE_WORD 4
+
+#define DPMAIF_MAX_CHECK_COUNT 1000000
+#define DPMAIF_CHECK_TIMEOUT_US 10000
+#define DPMAIF_CHECK_INIT_TIMEOUT_US 100000
+#define DPMAIF_CHECK_DELAY_US 10
+
+#define DPMAIF_RXQ_NUM 2
+#define DPMAIF_TXQ_NUM 5
+
+struct dpmaif_isr_en_mask {
+ unsigned int ap_ul_l2intr_en_msk;
+ unsigned int ap_dl_l2intr_en_msk;
+ unsigned int ap_udl_ip_busy_en_msk;
+ unsigned int ap_dl_l2intr_err_en_msk;
+};
+
+struct dpmaif_ul {
+ bool que_started;
+ unsigned char reserved[3];
+ dma_addr_t drb_base;
+ unsigned int drb_size_cnt;
+};
+
+struct dpmaif_dl {
+ bool que_started;
+ unsigned char reserved[3];
+ dma_addr_t pit_base;
+ unsigned int pit_size_cnt;
+ dma_addr_t bat_base;
+ unsigned int bat_size_cnt;
+ dma_addr_t frg_base;
+ unsigned int frg_size_cnt;
+ unsigned int pit_seq;
+};
+
+struct dpmaif_hw_info {
+ struct device *dev;
+ void __iomem *pcie_base;
+ struct dpmaif_dl dl_que[DPMAIF_RXQ_NUM];
+ struct dpmaif_ul ul_que[DPMAIF_TXQ_NUM];
+ struct dpmaif_isr_en_mask isr_en_mask;
+};
+
+/* DPMAIF HW Initialization parameter structure */
+struct dpmaif_hw_params {
+ /* UL part */
+ dma_addr_t drb_base_addr[DPMAIF_TXQ_NUM];
+ unsigned int drb_size_cnt[DPMAIF_TXQ_NUM];
+ /* DL part */
+ dma_addr_t pkt_bat_base_addr[DPMAIF_RXQ_NUM];
+ unsigned int pkt_bat_size_cnt[DPMAIF_RXQ_NUM];
+ dma_addr_t frg_bat_base_addr[DPMAIF_RXQ_NUM];
+ unsigned int frg_bat_size_cnt[DPMAIF_RXQ_NUM];
+ dma_addr_t pit_base_addr[DPMAIF_RXQ_NUM];
+ unsigned int pit_size_cnt[DPMAIF_RXQ_NUM];
+};
+
+enum dpmaif_hw_intr_type {
+ DPF_INTR_INVALID_MIN,
+ DPF_INTR_UL_DONE,
+ DPF_INTR_UL_DRB_EMPTY,
+ DPF_INTR_UL_MD_NOTREADY,
+ DPF_INTR_UL_MD_PWR_NOTREADY,
+ DPF_INTR_UL_LEN_ERR,
+ DPF_INTR_DL_DONE,
+ DPF_INTR_DL_SKB_LEN_ERR,
+ DPF_INTR_DL_BATCNT_LEN_ERR,
+ DPF_INTR_DL_PITCNT_LEN_ERR,
+ DPF_INTR_DL_PKT_EMPTY_SET,
+ DPF_INTR_DL_FRG_EMPTY_SET,
+ DPF_INTR_DL_MTU_ERR,
+ DPF_INTR_DL_FRGCNT_LEN_ERR,
+ DPF_INTR_DL_Q0_PITCNT_LEN_ERR,
+ DPF_INTR_DL_Q1_PITCNT_LEN_ERR,
+ DPF_INTR_DL_HPC_ENT_TYPE_ERR,
+ DPF_INTR_DL_Q0_DONE,
+ DPF_INTR_DL_Q1_DONE,
+ DPF_INTR_INVALID_MAX
+};
+
+#define DPF_RX_QNO0 0
+#define DPF_RX_QNO1 1
+#define DPF_RX_QNO_DFT DPF_RX_QNO0
+
+struct dpmaif_hw_intr_st_para {
+ unsigned int intr_cnt;
+ enum dpmaif_hw_intr_type intr_types[DPF_INTR_INVALID_MAX - 1];
+ unsigned int intr_queues[DPF_INTR_INVALID_MAX - 1];
+};
+
+#define DPMAIF_HW_BAT_REMAIN 64
+#define DPMAIF_HW_BAT_PKTBUF (128 * 28)
+#define DPMAIF_HW_FRG_PKTBUF 128
+#define DPMAIF_HW_BAT_RSVLEN 64
+#define DPMAIF_HW_PKT_BIDCNT 1
+#define DPMAIF_HW_MTU_SIZE (3 * 1024 + 8)
+#define DPMAIF_HW_CHK_BAT_NUM 62
+#define DPMAIF_HW_CHK_FRG_NUM 3
+#define DPMAIF_HW_CHK_PIT_NUM (2 * DPMAIF_HW_CHK_BAT_NUM)
+
+#define DP_UL_INT_DONE_OFFSET 0
+#define DP_UL_INT_QDONE_MSK GENMASK(4, 0)
+#define DP_UL_INT_EMPTY_MSK GENMASK(9, 5)
+#define DP_UL_INT_MD_NOTREADY_MSK GENMASK(14, 10)
+#define DP_UL_INT_MD_PWR_NOTREADY_MSK GENMASK(19, 15)
+#define DP_UL_INT_ERR_MSK GENMASK(24, 20)
+
+#define DP_DL_INT_QDONE_MSK BIT(0)
+#define DP_DL_INT_SKB_LEN_ERR BIT(1)
+#define DP_DL_INT_BATCNT_LEN_ERR BIT(2)
+#define DP_DL_INT_PITCNT_LEN_ERR BIT(3)
+#define DP_DL_INT_PKT_EMPTY_MSK BIT(4)
+#define DP_DL_INT_FRG_EMPTY_MSK BIT(5)
+#define DP_DL_INT_MTU_ERR_MSK BIT(6)
+#define DP_DL_INT_FRG_LEN_ERR_MSK BIT(7)
+#define DP_DL_INT_Q0_PITCNT_LEN_ERR BIT(8)
+#define DP_DL_INT_Q1_PITCNT_LEN_ERR BIT(9)
+#define DP_DL_INT_HPC_ENT_TYPE_ERR BIT(10)
+#define DP_DL_INT_Q0_DONE BIT(13)
+#define DP_DL_INT_Q1_DONE BIT(14)
+
+#define DP_DL_Q0_STATUS_MASK (DP_DL_INT_Q0_PITCNT_LEN_ERR | DP_DL_INT_Q0_DONE)
+#define DP_DL_Q1_STATUS_MASK (DP_DL_INT_Q1_PITCNT_LEN_ERR | DP_DL_INT_Q1_DONE)
+
+int t7xx_dpmaif_hw_init(struct dpmaif_hw_info *hw_info, struct dpmaif_hw_params *init_param);
+int t7xx_dpmaif_hw_stop_all_txq(struct dpmaif_hw_info *hw_info);
+int t7xx_dpmaif_hw_stop_all_rxq(struct dpmaif_hw_info *hw_info);
+void t7xx_dpmaif_start_hw(struct dpmaif_hw_info *hw_info);
+int t7xx_dpmaif_hw_get_intr_cnt(struct dpmaif_hw_info *hw_info,
+ struct dpmaif_hw_intr_st_para *para, int qno);
+void t7xx_dpmaif_unmask_ulq_intr(struct dpmaif_hw_info *hw_info, unsigned int q_num);
+void t7xx_dpmaif_ul_update_hw_drb_cnt(struct dpmaif_hw_info *hw_info, unsigned int q_num,
+ unsigned int drb_entry_cnt);
+int t7xx_dpmaif_dl_snd_hw_bat_cnt(struct dpmaif_hw_info *hw_info, unsigned int bat_entry_cnt);
+int t7xx_dpmaif_dl_snd_hw_frg_cnt(struct dpmaif_hw_info *hw_info, unsigned int frg_entry_cnt);
+int t7xx_dpmaif_dlq_add_pit_remain_cnt(struct dpmaif_hw_info *hw_info, unsigned int dlq_pit_idx,
+ unsigned int pit_remain_cnt);
+void t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(struct dpmaif_hw_info *hw_info,
+ unsigned int qno);
+void t7xx_dpmaif_dlq_unmask_rx_done(struct dpmaif_hw_info *hw_info, unsigned int qno);
+bool t7xx_dpmaif_ul_clr_done(struct dpmaif_hw_info *hw_info, unsigned int qno);
+void t7xx_dpmaif_ul_clr_all_intr(struct dpmaif_hw_info *hw_info);
+void t7xx_dpmaif_dl_clr_all_intr(struct dpmaif_hw_info *hw_info);
+void t7xx_dpmaif_clr_ip_busy_sts(struct dpmaif_hw_info *hw_info);
+void t7xx_dpmaif_dl_unmask_batcnt_len_err_intr(struct dpmaif_hw_info *hw_info);
+void t7xx_dpmaif_dl_unmask_pitcnt_len_err_intr(struct dpmaif_hw_info *hw_info);
+unsigned int t7xx_dpmaif_ul_get_rd_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num);
+unsigned int t7xx_dpmaif_dl_get_bat_rd_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num);
+unsigned int t7xx_dpmaif_dl_get_bat_wr_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num);
+unsigned int t7xx_dpmaif_dl_get_frg_rd_idx(struct dpmaif_hw_info *hw_info, unsigned int q_num);
+unsigned int t7xx_dpmaif_dl_dlq_pit_get_wr_idx(struct dpmaif_hw_info *hw_info,
+ unsigned int dlq_pit_idx);
+
+#endif /* __T7XX_DPMAIF_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_reg.h b/drivers/net/wwan/t7xx/t7xx_reg.h
index ad2d30d03cf4..7c1b81091a0f 100644
--- a/drivers/net/wwan/t7xx/t7xx_reg.h
+++ b/drivers/net/wwan/t7xx/t7xx_reg.h
@@ -134,4 +134,217 @@ enum t7xx_int {
CLDMA3_INT,
};

+/* DPMA definitions */
+
+#define DPMAIF_PD_BASE 0x1022d000
+#define BASE_DPMAIF_UL DPMAIF_PD_BASE
+#define BASE_DPMAIF_DL (DPMAIF_PD_BASE + 0x100)
+#define BASE_DPMAIF_AP_MISC (DPMAIF_PD_BASE + 0x400)
+#define BASE_DPMAIF_MMW_HPC (DPMAIF_PD_BASE + 0x600)
+#define BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX (DPMAIF_PD_BASE + 0x900)
+#define BASE_DPMAIF_PD_SRAM_DL (DPMAIF_PD_BASE + 0xc00)
+#define BASE_DPMAIF_PD_SRAM_UL (DPMAIF_PD_BASE + 0xd00)
+
+#define DPMAIF_AO_BASE 0x10014000
+#define BASE_DPMAIF_AO_UL DPMAIF_AO_BASE
+#define BASE_DPMAIF_AO_DL (DPMAIF_AO_BASE + 0x400)
+
+#define DPMAIF_UL_ADD_DESC (BASE_DPMAIF_UL + 0x00)
+#define DPMAIF_UL_CHK_BUSY (BASE_DPMAIF_UL + 0x88)
+#define DPMAIF_UL_RESERVE_AO_RW (BASE_DPMAIF_UL + 0xac)
+#define DPMAIF_UL_ADD_DESC_CH0 (BASE_DPMAIF_UL + 0xb0)
+
+#define DPMAIF_DL_BAT_INIT (BASE_DPMAIF_DL + 0x00)
+#define DPMAIF_DL_BAT_ADD (BASE_DPMAIF_DL + 0x04)
+#define DPMAIF_DL_BAT_INIT_CON0 (BASE_DPMAIF_DL + 0x08)
+#define DPMAIF_DL_BAT_INIT_CON1 (BASE_DPMAIF_DL + 0x0c)
+#define DPMAIF_DL_BAT_INIT_CON2 (BASE_DPMAIF_DL + 0x10)
+#define DPMAIF_DL_BAT_INIT_CON3 (BASE_DPMAIF_DL + 0x50)
+#define DPMAIF_DL_CHK_BUSY (BASE_DPMAIF_DL + 0xb4)
+
+#define DPMAIF_AP_L2TISAR0 (BASE_DPMAIF_AP_MISC + 0x00)
+#define DPMAIF_AP_APDL_L2TISAR0 (BASE_DPMAIF_AP_MISC + 0x50)
+#define DPMAIF_AP_IP_BUSY (BASE_DPMAIF_AP_MISC + 0x60)
+#define DPMAIF_AP_CG_EN (BASE_DPMAIF_AP_MISC + 0x68)
+#define DPMAIF_AP_OVERWRITE_CFG (BASE_DPMAIF_AP_MISC + 0x90)
+#define DPMAIF_AP_MEM_CLR (BASE_DPMAIF_AP_MISC + 0x94)
+#define DPMAIF_AP_ALL_L2TISAR0_MASK GENMASK(31, 0)
+#define DPMAIF_AP_APDL_ALL_L2TISAR0_MASK GENMASK(31, 0)
+#define DPMAIF_AP_IP_BUSY_MASK GENMASK(31, 0)
+
+#define DPMAIF_AO_UL_INIT_SET (BASE_DPMAIF_AO_UL + 0x0)
+#define DPMAIF_AO_UL_CHNL_ARB0 (BASE_DPMAIF_AO_UL + 0x1c)
+#define DPMAIF_AO_UL_AP_L2TIMR0 (BASE_DPMAIF_AO_UL + 0x80)
+#define DPMAIF_AO_UL_AP_L2TIMCR0 (BASE_DPMAIF_AO_UL + 0x84)
+#define DPMAIF_AO_UL_AP_L2TIMSR0 (BASE_DPMAIF_AO_UL + 0x88)
+#define DPMAIF_AO_UL_AP_L1TIMR0 (BASE_DPMAIF_AO_UL + 0x8c)
+#define DPMAIF_AO_UL_APDL_L2TIMR0 (BASE_DPMAIF_AO_UL + 0x90)
+#define DPMAIF_AO_UL_APDL_L2TIMCR0 (BASE_DPMAIF_AO_UL + 0x94)
+#define DPMAIF_AO_UL_APDL_L2TIMSR0 (BASE_DPMAIF_AO_UL + 0x98)
+#define DPMAIF_AO_AP_DLUL_IP_BUSY_MASK (BASE_DPMAIF_AO_UL + 0x9c)
+
+#define DPMAIF_AO_UL_CHNL0_CON0 (BASE_DPMAIF_PD_SRAM_UL + 0x10)
+#define DPMAIF_AO_UL_CHNL0_CON1 (BASE_DPMAIF_PD_SRAM_UL + 0x14)
+#define DPMAIF_AO_UL_CHNL0_CON2 (BASE_DPMAIF_PD_SRAM_UL + 0x18)
+#define DPMAIF_AO_UL_CH0_STA (BASE_DPMAIF_PD_SRAM_UL + 0x70)
+
+#define DPMAIF_AO_DL_INIT_SET (BASE_DPMAIF_AO_DL + 0x00)
+#define DPMAIF_AO_DL_IRQ_MASK (BASE_DPMAIF_AO_DL + 0x0c)
+#define DPMAIF_AO_DL_DLQPIT_INIT_CON5 (BASE_DPMAIF_AO_DL + 0x28)
+#define DPMAIF_AO_DL_DLQPIT_TRIG_THRES (BASE_DPMAIF_AO_DL + 0x34)
+
+#define DPMAIF_AO_DL_PKTINFO_CON0 (BASE_DPMAIF_PD_SRAM_DL + 0x00)
+#define DPMAIF_AO_DL_PKTINFO_CON1 (BASE_DPMAIF_PD_SRAM_DL + 0x04)
+#define DPMAIF_AO_DL_PKTINFO_CON2 (BASE_DPMAIF_PD_SRAM_DL + 0x08)
+#define DPMAIF_AO_DL_RDY_CHK_THRES (BASE_DPMAIF_PD_SRAM_DL + 0x0c)
+#define DPMAIF_AO_DL_RDY_CHK_FRG_THRES (BASE_DPMAIF_PD_SRAM_DL + 0x10)
+
+#define DPMAIF_AO_DL_DLQ_AGG_CFG (BASE_DPMAIF_PD_SRAM_DL + 0x20)
+#define DPMAIF_AO_DL_DLQPIT_TIMEOUT0 (BASE_DPMAIF_PD_SRAM_DL + 0x24)
+#define DPMAIF_AO_DL_DLQPIT_TIMEOUT1 (BASE_DPMAIF_PD_SRAM_DL + 0x28)
+#define DPMAIF_AO_DL_HPC_CNTL (BASE_DPMAIF_PD_SRAM_DL + 0x38)
+#define DPMAIF_AO_DL_PIT_SEQ_END (BASE_DPMAIF_PD_SRAM_DL + 0x40)
+
+#define DPMAIF_AO_DL_BAT_RD_IDX (BASE_DPMAIF_PD_SRAM_DL + 0xd8)
+#define DPMAIF_AO_DL_BAT_WR_IDX (BASE_DPMAIF_PD_SRAM_DL + 0xdc)
+#define DPMAIF_AO_DL_PIT_RD_IDX (BASE_DPMAIF_PD_SRAM_DL + 0xec)
+#define DPMAIF_AO_DL_PIT_WR_IDX (BASE_DPMAIF_PD_SRAM_DL + 0x60)
+#define DPMAIF_AO_DL_FRGBAT_RD_IDX (BASE_DPMAIF_PD_SRAM_DL + 0x78)
+#define DPMAIF_AO_DL_DLQ_WR_IDX (BASE_DPMAIF_PD_SRAM_DL + 0xa4)
+
+#define DPMAIF_HPC_INTR_MASK (BASE_DPMAIF_MMW_HPC + 0x0f4)
+#define DPMA_HPC_ALL_INT_MASK GENMASK(15, 0)
+
+#define DPMAIF_HPC_DLQ_PATH_MODE 3
+#define DPMAIF_HPC_ADD_MODE_DF 0
+#define DPMAIF_HPC_TOTAL_NUM 8
+#define DPMAIF_HPC_MAX_TOTAL_NUM 8
+
+#define DPMAIF_DL_DLQPIT_INIT (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x00)
+#define DPMAIF_DL_DLQPIT_ADD (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x10)
+#define DPMAIF_DL_DLQPIT_INIT_CON0 (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x14)
+#define DPMAIF_DL_DLQPIT_INIT_CON1 (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x18)
+#define DPMAIF_DL_DLQPIT_INIT_CON2 (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x1c)
+#define DPMAIF_DL_DLQPIT_INIT_CON3 (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x20)
+#define DPMAIF_DL_DLQPIT_INIT_CON4 (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x24)
+#define DPMAIF_DL_DLQPIT_INIT_CON5 (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x28)
+#define DPMAIF_DL_DLQPIT_INIT_CON6 (BASE_DPMAIF_DL_DLQ_REMOVEAO_IDX + 0x2c)
+
+#define DPMAIF_ULQSAR_n(q) (DPMAIF_AO_UL_CHNL0_CON0 + 0x10 * (q))
+#define DPMAIF_UL_DRBSIZE_ADDRH_n(q) (DPMAIF_AO_UL_CHNL0_CON1 + 0x10 * (q))
+#define DPMAIF_UL_DRB_ADDRH_n(q) (DPMAIF_AO_UL_CHNL0_CON2 + 0x10 * (q))
+#define DPMAIF_ULQ_STA0_n(q) (DPMAIF_AO_UL_CH0_STA + 0x04 * (q))
+#define DPMAIF_ULQ_ADD_DESC_CH_n(q) (DPMAIF_UL_ADD_DESC_CH0 + 0x04 * (q))
+
+#define DPMAIF_UL_DRB_RIDX_MSK GENMASK(31, 16)
+
+#define DPMAIF_AP_RGU_ASSERT 0x10001150
+#define DPMAIF_AP_RGU_DEASSERT 0x10001154
+#define DPMAIF_AP_RST_BIT BIT(2)
+
+#define DPMAIF_AP_AO_RGU_ASSERT 0x10001140
+#define DPMAIF_AP_AO_RGU_DEASSERT 0x10001144
+#define DPMAIF_AP_AO_RST_BIT BIT(6)
+
+/* DPMAIF init/restore */
+#define DPMAIF_UL_ADD_NOT_READY BIT(31)
+#define DPMAIF_UL_ADD_UPDATE BIT(31)
+#define DPMAIF_UL_ADD_COUNT_MASK GENMASK(15, 0)
+#define DPMAIF_UL_ALL_QUE_ARB_EN GENMASK(11, 8)
+
+#define DPMAIF_DL_ADD_UPDATE BIT(31)
+#define DPMAIF_DL_ADD_NOT_READY BIT(31)
+#define DPMAIF_DL_FRG_ADD_UPDATE BIT(16)
+#define DPMAIF_DL_ADD_COUNT_MASK GENMASK(15, 0)
+
+#define DPMAIF_DL_BAT_INIT_ALLSET BIT(0)
+#define DPMAIF_DL_BAT_FRG_INIT BIT(16)
+#define DPMAIF_DL_BAT_INIT_EN BIT(31)
+#define DPMAIF_DL_BAT_INIT_NOT_READY BIT(31)
+#define DPMAIF_DL_BAT_INIT_ONLY_ENABLE_BIT 0
+
+#define DPMAIF_DL_PIT_INIT_ALLSET BIT(0)
+#define DPMAIF_DL_PIT_INIT_EN BIT(31)
+#define DPMAIF_DL_PIT_INIT_NOT_READY BIT(31)
+
+#define DPMAIF_BAT_REMAIN_SZ_BASE 16
+#define DPMAIF_BAT_BUFFER_SZ_BASE 128
+#define DPMAIF_FRG_BUFFER_SZ_BASE 128
+
+#define DLQ_PIT_IDX_SIZE 0x20
+
+#define DPMAIF_PIT_SIZE_MSK GENMASK(17, 0)
+
+#define DPMAIF_PIT_REM_CNT_MSK GENMASK(17, 0)
+
+#define DPMAIF_BAT_EN_MSK BIT(16)
+#define DPMAIF_FRG_EN_MSK BIT(28)
+#define DPMAIF_BAT_SIZE_MSK GENMASK(15, 0)
+
+#define DPMAIF_BAT_BID_MAXCNT_MSK GENMASK(31, 16)
+#define DPMAIF_BAT_REMAIN_MINSZ_MSK GENMASK(15, 8)
+#define DPMAIF_PIT_CHK_NUM_MSK GENMASK(31, 24)
+#define DPMAIF_BAT_BUF_SZ_MSK GENMASK(16, 8)
+#define DPMAIF_FRG_BUF_SZ_MSK GENMASK(16, 8)
+#define DPMAIF_BAT_RSV_LEN_MSK GENMASK(7, 0)
+#define DPMAIF_PKT_ALIGN_MSK GENMASK(23, 22)
+
+#define DPMAIF_BAT_CHECK_THRES_MSK GENMASK(21, 16)
+#define DPMAIF_FRG_CHECK_THRES_MSK GENMASK(7, 0)
+
+#define DPMAIF_PKT_ALIGN_EN BIT(23)
+
+#define DPMAIF_DRB_SIZE_MSK GENMASK(15, 0)
+
+#define DPMAIF_DL_RD_WR_IDX_MSK GENMASK(17, 0)
+
+/* DPMAIF_UL_CHK_BUSY */
+#define DPMAIF_UL_IDLE_STS BIT(11)
+/* DPMAIF_DL_CHK_BUSY */
+#define DPMAIF_DL_IDLE_STS BIT(23)
+/* DPMAIF_AO_DL_RDY_CHK_THRES */
+#define DPMAIF_DL_PKT_CHECKSUM_EN BIT(31)
+#define DPMAIF_PORT_MODE_PCIE BIT(30)
+#define DPMAIF_DL_BURST_PIT_EN BIT(13)
+/* DPMAIF_DL_BAT_INIT_CON1 */
+#define DPMAIF_DL_BAT_CACHE_PRI BIT(22)
+/* DPMAIF_AP_MEM_CLR */
+#define DPMAIF_MEM_CLR BIT(0)
+/* DPMAIF_AP_OVERWRITE_CFG */
+#define DPMAIF_SRAM_SYNC BIT(0)
+/* DPMAIF_AO_UL_INIT_SET */
+#define DPMAIF_UL_INIT_DONE BIT(0)
+/* DPMAIF_AO_DL_INIT_SET */
+#define DPMAIF_DL_INIT_DONE BIT(0)
+/* DPMAIF_AO_DL_PIT_SEQ_END */
+#define DPMAIF_DL_PIT_SEQ_MSK GENMASK(7, 0)
+/* DPMAIF_UL_RESERVE_AO_RW */
+#define DPMAIF_PCIE_MODE_SET_VALUE 0x55
+/* DPMAIF_AP_CG_EN */
+#define DPMAIF_CG_EN 0x7f
+
+#define DPMAIF_UDL_IP_BUSY BIT(0)
+#define DPMAIF_DL_INT_DLQ0_QDONE BIT(8)
+#define DPMAIF_DL_INT_DLQ1_QDONE BIT(9)
+#define DPMAIF_DL_INT_DLQ0_PITCNT_LEN BIT(10)
+#define DPMAIF_DL_INT_DLQ1_PITCNT_LEN BIT(11)
+#define DPMAIF_DL_INT_Q2TOQ1 BIT(24)
+#define DPMAIF_DL_INT_Q2APTOP BIT(25)
+
+#define DPMAIF_DLQ_LOW_TIMEOUT_THRES_MKS GENMASK(15, 0)
+#define DPMAIF_DLQ_HIGH_TIMEOUT_THRES_MSK GENMASK(31, 16)
+
+/* DPMAIF DLQ HW configure */
+#define DPMAIF_AGG_MAX_LEN_DF 65535
+#define DPMAIF_AGG_TBL_ENT_NUM_DF 50
+#define DPMAIF_HASH_PRIME_DF 13
+#define DPMAIF_MID_TIMEOUT_THRES_DF 100
+#define DPMAIF_DLQ_TIMEOUT_THRES_DF 100
+#define DPMAIF_DLQ_PRS_THRES_DF 10
+#define DPMAIF_DLQ_HASH_BIT_CHOOSE_DF 0
+
+#define DPMAIF_DLQPIT_EN_MSK BIT(20)
+#define DPMAIF_DLQPIT_CHAN_OFS 16
+#define DPMAIF_ADD_DLQ_PIT_CHAN_OFS 20
+
#endif /* __T7XX_REG_H__ */
--
2.25.1


2022-05-09 07:19:02

by Martinez, Ricardo

[permalink] [raw]
Subject: Re: [PATCH net-next v7 00/14] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem


On 5/6/2022 6:43 AM, Sergey Ryazanov wrote:
> Hello Ricardo,
>
> On Fri, May 6, 2022 at 4:16 AM Ricardo Martinez
> <[email protected]> wrote:
>> t7xx is the PCIe host device driver for Intel 5G 5000 M.2 solution which
>> is based on MediaTek's T700 modem to provide WWAN connectivity.
>> The driver uses the WWAN framework infrastructure to create the following
>> control ports and network interfaces:
>> * /dev/wwan0mbim0 - Interface conforming to the MBIM protocol.
>> Applications like libmbim [1] or Modem Manager [2] from v1.16 onwards
>> with [3][4] can use it to enable data communication towards WWAN.
>> * /dev/wwan0at0 - Interface that supports AT commands.
>> * wwan0 - Primary network interface for IP traffic.
>>
>> The main blocks in t7xx driver are:
>> * PCIe layer - Implements probe, removal, and power management callbacks.
>> * Port-proxy - Provides a common interface to interact with different types
>> of ports such as WWAN ports.
>> * Modem control & status monitor - Implements the entry point for modem
>> initialization, reset and exit, as well as exception handling.
>> * CLDMA (Control Layer DMA) - Manages the HW used by the port layer to send
>> control messages to the modem using MediaTek's CCCI (Cross-Core
>> Communication Interface) protocol.
>> * DPMAIF (Data Plane Modem AP Interface) - Controls the HW that provides
>> uplink and downlink queues for the data path. The data exchange takes
>> place using circular buffers to share data buffer addresses and metadata
>> to describe the packets.
>> * MHCCIF (Modem Host Cross-Core Interface) - Provides interrupt channels
>> for bidirectional event notification such as handshake, exception, PM and
>> port enumeration.
>>
>> The compilation of the t7xx driver is enabled by the CONFIG_MTK_T7XX config
>> option which depends on CONFIG_WWAN.
>> This driver was originally developed by MediaTek. Intel adapted t7xx to
>> the WWAN framework, optimized and refactored the driver source code in close
>> collaboration with MediaTek. This will enable getting the t7xx driver on the
>> Approved Vendor List for interested OEM's and ODM's productization plans
>> with Intel 5G 5000 M.2 solution.
>>
>> List of contributors:
>> Amir Hanania <[email protected]>
>> Andriy Shevchenko <[email protected]>
>> Chandrashekar Devegowda <[email protected]>
>> Dinesh Sharma <[email protected]>
>> Eliot Lee <[email protected]>
>> Haijun Liu <[email protected]>
>> M Chetan Kumar <[email protected]>
>> Mika Westerberg <[email protected]>
>> Moises Veleta <[email protected]>
>> Pierre-louis Bossart <[email protected]>
>> Chiranjeevi Rapolu <[email protected]>
>> Ricardo Martinez <[email protected]>
>> Madhusmita Sahu <[email protected]>
>> Muralidharan Sethuraman <[email protected]>
>> Soumya Prakash Mishra <[email protected]>
>> Sreehari Kancharla <[email protected]>
>> Suresh Nagaraj <[email protected]>
>>
>> [1] https://www.freedesktop.org/software/libmbim/
>> [2] https://www.freedesktop.org/software/ModemManager/
>> [3] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/582
>> [4] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/523
> Now the driver looks really nice. Good job!

Thanks Sergey.


2022-05-09 07:55:04

by Sergey Ryazanov

[permalink] [raw]
Subject: Re: [PATCH net-next v7 00/14] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem

Hello Ricardo,

On Fri, May 6, 2022 at 4:16 AM Ricardo Martinez
<[email protected]> wrote:
> t7xx is the PCIe host device driver for Intel 5G 5000 M.2 solution which
> is based on MediaTek's T700 modem to provide WWAN connectivity.
> The driver uses the WWAN framework infrastructure to create the following
> control ports and network interfaces:
> * /dev/wwan0mbim0 - Interface conforming to the MBIM protocol.
> Applications like libmbim [1] or Modem Manager [2] from v1.16 onwards
> with [3][4] can use it to enable data communication towards WWAN.
> * /dev/wwan0at0 - Interface that supports AT commands.
> * wwan0 - Primary network interface for IP traffic.
>
> The main blocks in t7xx driver are:
> * PCIe layer - Implements probe, removal, and power management callbacks.
> * Port-proxy - Provides a common interface to interact with different types
> of ports such as WWAN ports.
> * Modem control & status monitor - Implements the entry point for modem
> initialization, reset and exit, as well as exception handling.
> * CLDMA (Control Layer DMA) - Manages the HW used by the port layer to send
> control messages to the modem using MediaTek's CCCI (Cross-Core
> Communication Interface) protocol.
> * DPMAIF (Data Plane Modem AP Interface) - Controls the HW that provides
> uplink and downlink queues for the data path. The data exchange takes
> place using circular buffers to share data buffer addresses and metadata
> to describe the packets.
> * MHCCIF (Modem Host Cross-Core Interface) - Provides interrupt channels
> for bidirectional event notification such as handshake, exception, PM and
> port enumeration.
>
> The compilation of the t7xx driver is enabled by the CONFIG_MTK_T7XX config
> option which depends on CONFIG_WWAN.
> This driver was originally developed by MediaTek. Intel adapted t7xx to
> the WWAN framework, optimized and refactored the driver source code in close
> collaboration with MediaTek. This will enable getting the t7xx driver on the
> Approved Vendor List for interested OEM's and ODM's productization plans
> with Intel 5G 5000 M.2 solution.
>
> List of contributors:
> Amir Hanania <[email protected]>
> Andriy Shevchenko <[email protected]>
> Chandrashekar Devegowda <[email protected]>
> Dinesh Sharma <[email protected]>
> Eliot Lee <[email protected]>
> Haijun Liu <[email protected]>
> M Chetan Kumar <[email protected]>
> Mika Westerberg <[email protected]>
> Moises Veleta <[email protected]>
> Pierre-louis Bossart <[email protected]>
> Chiranjeevi Rapolu <[email protected]>
> Ricardo Martinez <[email protected]>
> Madhusmita Sahu <[email protected]>
> Muralidharan Sethuraman <[email protected]>
> Soumya Prakash Mishra <[email protected]>
> Sreehari Kancharla <[email protected]>
> Suresh Nagaraj <[email protected]>
>
> [1] https://www.freedesktop.org/software/libmbim/
> [2] https://www.freedesktop.org/software/ModemManager/
> [3] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/582
> [4] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/523

Now the driver looks really nice. Good job!

--
Sergey

2022-05-09 08:02:09

by Martinez, Ricardo

[permalink] [raw]
Subject: [PATCH net-next v7 07/14] net: wwan: t7xx: Add AT and MBIM WWAN ports

From: Chandrashekar Devegowda <[email protected]>

Adds AT and MBIM ports to the port proxy infrastructure.
The initialization method is responsible for creating the corresponding
ports using the WWAN framework infrastructure. The implemented WWAN port
operations are start, stop, and TX.

Signed-off-by: Chandrashekar Devegowda <[email protected]>
Co-developed-by: Ricardo Martinez <[email protected]>
Signed-off-by: Ricardo Martinez <[email protected]>
Reviewed-by: Loic Poulain <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
---
drivers/net/wwan/t7xx/Makefile | 1 +
drivers/net/wwan/t7xx/t7xx_port_proxy.c | 20 +++
drivers/net/wwan/t7xx/t7xx_port_proxy.h | 1 +
drivers/net/wwan/t7xx/t7xx_port_wwan.c | 176 ++++++++++++++++++++++++
4 files changed, 198 insertions(+)
create mode 100644 drivers/net/wwan/t7xx/t7xx_port_wwan.c

diff --git a/drivers/net/wwan/t7xx/Makefile b/drivers/net/wwan/t7xx/Makefile
index 63e1c67b82b5..9eec2e2472fb 100644
--- a/drivers/net/wwan/t7xx/Makefile
+++ b/drivers/net/wwan/t7xx/Makefile
@@ -12,3 +12,4 @@ mtk_t7xx-y:= t7xx_pci.o \
t7xx_hif_cldma.o \
t7xx_port_proxy.o \
t7xx_port_ctrl_msg.o \
+ t7xx_port_wwan.o \
diff --git a/drivers/net/wwan/t7xx/t7xx_port_proxy.c b/drivers/net/wwan/t7xx/t7xx_port_proxy.c
index 55f932d2c126..7d2c0e81e33d 100644
--- a/drivers/net/wwan/t7xx/t7xx_port_proxy.c
+++ b/drivers/net/wwan/t7xx/t7xx_port_proxy.c
@@ -50,6 +50,26 @@

static const struct t7xx_port_conf t7xx_md_port_conf[] = {
{
+ .tx_ch = PORT_CH_UART2_TX,
+ .rx_ch = PORT_CH_UART2_RX,
+ .txq_index = Q_IDX_AT_CMD,
+ .rxq_index = Q_IDX_AT_CMD,
+ .txq_exp_index = 0xff,
+ .rxq_exp_index = 0xff,
+ .path_id = CLDMA_ID_MD,
+ .ops = &wwan_sub_port_ops,
+ .name = "AT",
+ .port_type = WWAN_PORT_AT,
+ }, {
+ .tx_ch = PORT_CH_MBIM_TX,
+ .rx_ch = PORT_CH_MBIM_RX,
+ .txq_index = Q_IDX_MBIM,
+ .rxq_index = Q_IDX_MBIM,
+ .path_id = CLDMA_ID_MD,
+ .ops = &wwan_sub_port_ops,
+ .name = "MBIM",
+ .port_type = WWAN_PORT_MBIM,
+ }, {
.tx_ch = PORT_CH_CONTROL_TX,
.rx_ch = PORT_CH_CONTROL_RX,
.txq_index = Q_IDX_CTRL,
diff --git a/drivers/net/wwan/t7xx/t7xx_port_proxy.h b/drivers/net/wwan/t7xx/t7xx_port_proxy.h
index 23f6af0ba3eb..bc1ff5c6c700 100644
--- a/drivers/net/wwan/t7xx/t7xx_port_proxy.h
+++ b/drivers/net/wwan/t7xx/t7xx_port_proxy.h
@@ -84,6 +84,7 @@ struct ctrl_msg_header {
#define PORT_ENUM_VER_MISMATCH 0x00657272

/* Port operations mapping */
+extern struct port_ops wwan_sub_port_ops;
extern struct port_ops ctl_port_ops;

void t7xx_port_proxy_reset(struct port_proxy *port_prox);
diff --git a/drivers/net/wwan/t7xx/t7xx_port_wwan.c b/drivers/net/wwan/t7xx/t7xx_port_wwan.c
new file mode 100644
index 000000000000..33931bfd78fd
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_port_wwan.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Chandrashekar Devegowda <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Andy Shevchenko <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/gfp.h>
+#include <linux/minmax.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/wwan.h>
+
+#include "t7xx_port.h"
+#include "t7xx_port_proxy.h"
+#include "t7xx_state_monitor.h"
+
+static int t7xx_port_ctrl_start(struct wwan_port *port)
+{
+ struct t7xx_port *port_mtk = wwan_port_get_drvdata(port);
+
+ if (atomic_read(&port_mtk->usage_cnt))
+ return -EBUSY;
+
+ atomic_inc(&port_mtk->usage_cnt);
+ return 0;
+}
+
+static void t7xx_port_ctrl_stop(struct wwan_port *port)
+{
+ struct t7xx_port *port_mtk = wwan_port_get_drvdata(port);
+
+ atomic_dec(&port_mtk->usage_cnt);
+}
+
+static int t7xx_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
+{
+ struct t7xx_port *port_private = wwan_port_get_drvdata(port);
+ size_t len, offset, chunk_len = 0, txq_mtu = CLDMA_MTU;
+ const struct t7xx_port_conf *port_conf;
+ struct t7xx_fsm_ctl *ctl;
+ enum md_state md_state;
+
+ len = skb->len;
+ if (!len || !port_private->chan_enable)
+ return -EINVAL;
+
+ port_conf = port_private->port_conf;
+ ctl = port_private->t7xx_dev->md->fsm_ctl;
+ md_state = t7xx_fsm_get_md_state(ctl);
+ if (md_state == MD_STATE_WAITING_FOR_HS1 || md_state == MD_STATE_WAITING_FOR_HS2) {
+ dev_warn(port_private->dev, "Cannot write to %s port when md_state=%d\n",
+ port_conf->name, md_state);
+ return -ENODEV;
+ }
+
+ for (offset = 0; offset < len; offset += chunk_len) {
+ struct sk_buff *skb_ccci;
+ int ret;
+
+ chunk_len = min(len - offset, txq_mtu - sizeof(struct ccci_header));
+ skb_ccci = t7xx_port_alloc_skb(chunk_len);
+ if (!skb_ccci)
+ return -ENOMEM;
+
+ skb_put_data(skb_ccci, skb->data + offset, chunk_len);
+ ret = t7xx_port_send_skb(port_private, skb_ccci, 0, 0);
+ if (ret) {
+ dev_kfree_skb_any(skb_ccci);
+ dev_err(port_private->dev, "Write error on %s port, %d\n",
+ port_conf->name, ret);
+ return ret;
+ }
+ }
+
+ dev_kfree_skb(skb);
+ return 0;
+}
+
+static const struct wwan_port_ops wwan_ops = {
+ .start = t7xx_port_ctrl_start,
+ .stop = t7xx_port_ctrl_stop,
+ .tx = t7xx_port_ctrl_tx,
+};
+
+static int t7xx_port_wwan_init(struct t7xx_port *port)
+{
+ port->rx_length_th = RX_QUEUE_MAXLEN;
+ return 0;
+}
+
+static void t7xx_port_wwan_uninit(struct t7xx_port *port)
+{
+ if (!port->wwan_port)
+ return;
+
+ port->rx_length_th = 0;
+ wwan_remove_port(port->wwan_port);
+ port->wwan_port = NULL;
+}
+
+static int t7xx_port_wwan_recv_skb(struct t7xx_port *port, struct sk_buff *skb)
+{
+ if (!atomic_read(&port->usage_cnt) || !port->chan_enable) {
+ const struct t7xx_port_conf *port_conf = port->port_conf;
+
+ dev_kfree_skb_any(skb);
+ dev_err_ratelimited(port->dev, "Port %s is not opened, drop packets\n",
+ port_conf->name);
+ /* Dropping skb, caller should not access skb.*/
+ return 0;
+ }
+
+ wwan_port_rx(port->wwan_port, skb);
+ return 0;
+}
+
+static int t7xx_port_wwan_enable_chl(struct t7xx_port *port)
+{
+ spin_lock(&port->port_update_lock);
+ port->chan_enable = true;
+ spin_unlock(&port->port_update_lock);
+
+ return 0;
+}
+
+static int t7xx_port_wwan_disable_chl(struct t7xx_port *port)
+{
+ spin_lock(&port->port_update_lock);
+ port->chan_enable = false;
+ spin_unlock(&port->port_update_lock);
+
+ return 0;
+}
+
+static void t7xx_port_wwan_md_state_notify(struct t7xx_port *port, unsigned int state)
+{
+ const struct t7xx_port_conf *port_conf = port->port_conf;
+
+ if (state != MD_STATE_READY)
+ return;
+
+ if (!port->wwan_port) {
+ port->wwan_port = wwan_create_port(port->dev, port_conf->port_type,
+ &wwan_ops, port);
+ if (IS_ERR(port->wwan_port))
+ dev_err(port->dev, "Unable to create WWWAN port %s", port_conf->name);
+ }
+}
+
+struct port_ops wwan_sub_port_ops = {
+ .init = t7xx_port_wwan_init,
+ .recv_skb = t7xx_port_wwan_recv_skb,
+ .uninit = t7xx_port_wwan_uninit,
+ .enable_chl = t7xx_port_wwan_enable_chl,
+ .disable_chl = t7xx_port_wwan_disable_chl,
+ .md_state_notify = t7xx_port_wwan_md_state_notify,
+};
--
2.25.1


2022-05-09 09:16:51

by Martinez, Ricardo

[permalink] [raw]
Subject: [PATCH net-next v7 09/14] net: wwan: t7xx: Add data path interface

From: Haijun Liu <[email protected]>

Data Path Modem AP Interface (DPMAIF) HIF layer provides methods
for initialization, ISR, control and event handling of TX/RX flows.

DPMAIF TX
Exposes the 'dmpaif_tx_send_skb' function which can be used by the
network device to transmit packets.
The uplink data management uses a Descriptor Ring Buffer (DRB).
First DRB entry is a message type that will be followed by 1 or more
normal DRB entries. Message type DRB will hold the skb information
and each normal DRB entry holds a pointer to the skb payload.

DPMAIF RX
The downlink buffer management uses Buffer Address Table (BAT) and
Packet Information Table (PIT) rings.
The BAT ring holds the address of skb data buffer for the HW to use,
while the PIT contains metadata about a whole network packet including
a reference to the BAT entry holding the data buffer address.
The driver reads the PIT and BAT entries written by the modem, when
reaching a threshold, the driver will reload the PIT and BAT rings.

Signed-off-by: Haijun Liu <[email protected]>
Signed-off-by: Chandrashekar Devegowda <[email protected]>
Co-developed-by: Ricardo Martinez <[email protected]>
Signed-off-by: Ricardo Martinez <[email protected]>
Reviewed-by: Loic Poulain <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
---
drivers/net/wwan/t7xx/Makefile | 4 +
drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c | 484 ++++++++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h | 205 ++++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.c | 1220 ++++++++++++++++++++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.h | 116 ++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c | 651 +++++++++++
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.h | 78 ++
7 files changed, 2758 insertions(+)
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.h

diff --git a/drivers/net/wwan/t7xx/Makefile b/drivers/net/wwan/t7xx/Makefile
index 9eec2e2472fb..04a9ba50dc14 100644
--- a/drivers/net/wwan/t7xx/Makefile
+++ b/drivers/net/wwan/t7xx/Makefile
@@ -13,3 +13,7 @@ mtk_t7xx-y:= t7xx_pci.o \
t7xx_port_proxy.o \
t7xx_port_ctrl_msg.o \
t7xx_port_wwan.o \
+ t7xx_hif_dpmaif.o \
+ t7xx_hif_dpmaif_tx.o \
+ t7xx_hif_dpmaif_rx.o \
+ t7xx_dpmaif.o \
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c
new file mode 100644
index 000000000000..2e9a8d7ba693
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c
@@ -0,0 +1,484 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/device.h>
+#include <linux/gfp.h>
+#include <linux/irqreturn.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_dpmaif.h"
+#include "t7xx_hif_dpmaif.h"
+#include "t7xx_hif_dpmaif_rx.h"
+#include "t7xx_hif_dpmaif_tx.h"
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_state_monitor.h"
+
+unsigned int t7xx_ring_buf_get_next_wr_idx(unsigned int buf_len, unsigned int buf_idx)
+{
+ buf_idx++;
+
+ return buf_idx < buf_len ? buf_idx : 0;
+}
+
+unsigned int t7xx_ring_buf_rd_wr_count(unsigned int total_cnt, unsigned int rd_idx,
+ unsigned int wr_idx, enum dpmaif_rdwr rd_wr)
+{
+ int pkt_cnt;
+
+ if (rd_wr == DPMAIF_READ)
+ pkt_cnt = wr_idx - rd_idx;
+ else
+ pkt_cnt = rd_idx - wr_idx - 1;
+
+ if (pkt_cnt < 0)
+ pkt_cnt += total_cnt;
+
+ return (unsigned int)pkt_cnt;
+}
+
+static void t7xx_dpmaif_enable_irq(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct dpmaif_isr_para *isr_para;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dpmaif_ctrl->isr_para); i++) {
+ isr_para = &dpmaif_ctrl->isr_para[i];
+ t7xx_pcie_mac_set_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
+ }
+}
+
+static void t7xx_dpmaif_disable_irq(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct dpmaif_isr_para *isr_para;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dpmaif_ctrl->isr_para); i++) {
+ isr_para = &dpmaif_ctrl->isr_para[i];
+ t7xx_pcie_mac_clear_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
+ }
+}
+
+static void t7xx_dpmaif_irq_cb(struct dpmaif_isr_para *isr_para)
+{
+ struct dpmaif_ctrl *dpmaif_ctrl = isr_para->dpmaif_ctrl;
+ struct dpmaif_hw_intr_st_para intr_status;
+ struct device *dev = dpmaif_ctrl->dev;
+ struct dpmaif_hw_info *hw_info;
+ int i;
+
+ memset(&intr_status, 0, sizeof(intr_status));
+ hw_info = &dpmaif_ctrl->hw_info;
+
+ if (t7xx_dpmaif_hw_get_intr_cnt(hw_info, &intr_status, isr_para->dlq_id) < 0) {
+ dev_err(dev, "Failed to get HW interrupt count\n");
+ return;
+ }
+
+ t7xx_pcie_mac_clear_int_status(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
+
+ for (i = 0; i < intr_status.intr_cnt; i++) {
+ switch (intr_status.intr_types[i]) {
+ case DPF_INTR_UL_DONE:
+ t7xx_dpmaif_irq_tx_done(dpmaif_ctrl, intr_status.intr_queues[i]);
+ break;
+
+ case DPF_INTR_UL_DRB_EMPTY:
+ case DPF_INTR_UL_MD_NOTREADY:
+ case DPF_INTR_UL_MD_PWR_NOTREADY:
+ /* No need to log an error for these */
+ break;
+
+ case DPF_INTR_DL_BATCNT_LEN_ERR:
+ dev_err_ratelimited(dev, "DL interrupt: packet BAT count length error\n");
+ t7xx_dpmaif_dl_unmask_batcnt_len_err_intr(hw_info);
+ break;
+
+ case DPF_INTR_DL_PITCNT_LEN_ERR:
+ dev_err_ratelimited(dev, "DL interrupt: PIT count length error\n");
+ t7xx_dpmaif_dl_unmask_pitcnt_len_err_intr(hw_info);
+ break;
+
+ case DPF_INTR_DL_Q0_PITCNT_LEN_ERR:
+ dev_err_ratelimited(dev, "DL interrupt: DLQ0 PIT count length error\n");
+ t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(hw_info, DPF_RX_QNO_DFT);
+ break;
+
+ case DPF_INTR_DL_Q1_PITCNT_LEN_ERR:
+ dev_err_ratelimited(dev, "DL interrupt: DLQ1 PIT count length error\n");
+ t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(hw_info, DPF_RX_QNO1);
+ break;
+
+ case DPF_INTR_DL_DONE:
+ case DPF_INTR_DL_Q0_DONE:
+ case DPF_INTR_DL_Q1_DONE:
+ t7xx_dpmaif_irq_rx_done(dpmaif_ctrl, intr_status.intr_queues[i]);
+ break;
+
+ default:
+ dev_err_ratelimited(dev, "DL interrupt error: unknown type : %d\n",
+ intr_status.intr_types[i]);
+ }
+ }
+}
+
+static irqreturn_t t7xx_dpmaif_isr_handler(int irq, void *data)
+{
+ struct dpmaif_isr_para *isr_para = data;
+ struct dpmaif_ctrl *dpmaif_ctrl;
+
+ dpmaif_ctrl = isr_para->dpmaif_ctrl;
+ if (dpmaif_ctrl->state != DPMAIF_STATE_PWRON) {
+ dev_err(dpmaif_ctrl->dev, "Interrupt received before initializing DPMAIF\n");
+ return IRQ_HANDLED;
+ }
+
+ t7xx_pcie_mac_clear_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
+ t7xx_dpmaif_irq_cb(isr_para);
+ t7xx_pcie_mac_set_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int);
+ return IRQ_HANDLED;
+}
+
+static void t7xx_dpmaif_isr_parameter_init(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct dpmaif_isr_para *isr_para;
+ unsigned char i;
+
+ dpmaif_ctrl->rxq_int_mapping[DPF_RX_QNO0] = DPMAIF_INT;
+ dpmaif_ctrl->rxq_int_mapping[DPF_RX_QNO1] = DPMAIF2_INT;
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
+ isr_para = &dpmaif_ctrl->isr_para[i];
+ isr_para->dpmaif_ctrl = dpmaif_ctrl;
+ isr_para->dlq_id = i;
+ isr_para->pcie_int = dpmaif_ctrl->rxq_int_mapping[i];
+ }
+}
+
+static void t7xx_dpmaif_register_pcie_irq(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct t7xx_pci_dev *t7xx_dev = dpmaif_ctrl->t7xx_dev;
+ struct dpmaif_isr_para *isr_para;
+ enum t7xx_int int_type;
+ int i;
+
+ t7xx_dpmaif_isr_parameter_init(dpmaif_ctrl);
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
+ isr_para = &dpmaif_ctrl->isr_para[i];
+ int_type = isr_para->pcie_int;
+ t7xx_pcie_mac_clear_int(t7xx_dev, int_type);
+
+ t7xx_dev->intr_handler[int_type] = t7xx_dpmaif_isr_handler;
+ t7xx_dev->intr_thread[int_type] = NULL;
+ t7xx_dev->callback_param[int_type] = isr_para;
+
+ t7xx_pcie_mac_clear_int_status(t7xx_dev, int_type);
+ t7xx_pcie_mac_set_int(t7xx_dev, int_type);
+ }
+}
+
+static int t7xx_dpmaif_rxtx_sw_allocs(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct dpmaif_rx_queue *rx_q;
+ struct dpmaif_tx_queue *tx_q;
+ int ret, rx_idx, tx_idx, i;
+
+ ret = t7xx_dpmaif_bat_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_req, BAT_TYPE_NORMAL);
+ if (ret) {
+ dev_err(dpmaif_ctrl->dev, "Failed to allocate normal BAT table: %d\n", ret);
+ return ret;
+ }
+
+ ret = t7xx_dpmaif_bat_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_frag, BAT_TYPE_FRAG);
+ if (ret) {
+ dev_err(dpmaif_ctrl->dev, "Failed to allocate frag BAT table: %d\n", ret);
+ goto err_free_normal_bat;
+ }
+
+ for (rx_idx = 0; rx_idx < DPMAIF_RXQ_NUM; rx_idx++) {
+ rx_q = &dpmaif_ctrl->rxq[rx_idx];
+ rx_q->index = rx_idx;
+ rx_q->dpmaif_ctrl = dpmaif_ctrl;
+ ret = t7xx_dpmaif_rxq_init(rx_q);
+ if (ret)
+ goto err_free_rxq;
+ }
+
+ for (tx_idx = 0; tx_idx < DPMAIF_TXQ_NUM; tx_idx++) {
+ tx_q = &dpmaif_ctrl->txq[tx_idx];
+ tx_q->index = tx_idx;
+ tx_q->dpmaif_ctrl = dpmaif_ctrl;
+ ret = t7xx_dpmaif_txq_init(tx_q);
+ if (ret)
+ goto err_free_txq;
+ }
+
+ ret = t7xx_dpmaif_tx_thread_init(dpmaif_ctrl);
+ if (ret) {
+ dev_err(dpmaif_ctrl->dev, "Failed to start TX thread\n");
+ goto err_free_txq;
+ }
+
+ ret = t7xx_dpmaif_bat_rel_wq_alloc(dpmaif_ctrl);
+ if (ret)
+ goto err_thread_rel;
+
+ return 0;
+
+err_thread_rel:
+ t7xx_dpmaif_tx_thread_rel(dpmaif_ctrl);
+
+err_free_txq:
+ for (i = 0; i < tx_idx; i++) {
+ tx_q = &dpmaif_ctrl->txq[i];
+ t7xx_dpmaif_txq_free(tx_q);
+ }
+
+err_free_rxq:
+ for (i = 0; i < rx_idx; i++) {
+ rx_q = &dpmaif_ctrl->rxq[i];
+ t7xx_dpmaif_rxq_free(rx_q);
+ }
+
+ t7xx_dpmaif_bat_free(dpmaif_ctrl, &dpmaif_ctrl->bat_frag);
+
+err_free_normal_bat:
+ t7xx_dpmaif_bat_free(dpmaif_ctrl, &dpmaif_ctrl->bat_req);
+
+ return ret;
+}
+
+static void t7xx_dpmaif_sw_release(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct dpmaif_rx_queue *rx_q;
+ struct dpmaif_tx_queue *tx_q;
+ int i;
+
+ t7xx_dpmaif_tx_thread_rel(dpmaif_ctrl);
+ t7xx_dpmaif_bat_wq_rel(dpmaif_ctrl);
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+ tx_q = &dpmaif_ctrl->txq[i];
+ t7xx_dpmaif_txq_free(tx_q);
+ }
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
+ rx_q = &dpmaif_ctrl->rxq[i];
+ t7xx_dpmaif_rxq_free(rx_q);
+ }
+}
+
+static int t7xx_dpmaif_start(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct dpmaif_hw_info *hw_info = &dpmaif_ctrl->hw_info;
+ struct dpmaif_hw_params hw_init_para;
+ struct dpmaif_rx_queue *rxq;
+ struct dpmaif_tx_queue *txq;
+ unsigned int buf_cnt;
+ int i, ret = 0;
+
+ if (dpmaif_ctrl->state == DPMAIF_STATE_PWRON)
+ return -EFAULT;
+
+ memset(&hw_init_para, 0, sizeof(hw_init_para));
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
+ rxq = &dpmaif_ctrl->rxq[i];
+ rxq->que_started = true;
+ rxq->index = i;
+ rxq->budget = rxq->bat_req->bat_size_cnt - 1;
+
+ hw_init_para.pkt_bat_base_addr[i] = rxq->bat_req->bat_bus_addr;
+ hw_init_para.pkt_bat_size_cnt[i] = rxq->bat_req->bat_size_cnt;
+ hw_init_para.pit_base_addr[i] = rxq->pit_bus_addr;
+ hw_init_para.pit_size_cnt[i] = rxq->pit_size_cnt;
+ hw_init_para.frg_bat_base_addr[i] = rxq->bat_frag->bat_bus_addr;
+ hw_init_para.frg_bat_size_cnt[i] = rxq->bat_frag->bat_size_cnt;
+ }
+
+ bitmap_zero(dpmaif_ctrl->bat_req.bat_bitmap, dpmaif_ctrl->bat_req.bat_size_cnt);
+ buf_cnt = dpmaif_ctrl->bat_req.bat_size_cnt - 1;
+ ret = t7xx_dpmaif_rx_buf_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_req, 0, buf_cnt, true);
+ if (ret) {
+ dev_err(dpmaif_ctrl->dev, "Failed to allocate RX buffer: %d\n", ret);
+ return ret;
+ }
+
+ buf_cnt = dpmaif_ctrl->bat_frag.bat_size_cnt - 1;
+ ret = t7xx_dpmaif_rx_frag_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_frag, buf_cnt, true);
+ if (ret) {
+ dev_err(dpmaif_ctrl->dev, "Failed to allocate frag RX buffer: %d\n", ret);
+ goto err_free_normal_bat;
+ }
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+ txq = &dpmaif_ctrl->txq[i];
+ txq->que_started = true;
+
+ hw_init_para.drb_base_addr[i] = txq->drb_bus_addr;
+ hw_init_para.drb_size_cnt[i] = txq->drb_size_cnt;
+ }
+
+ ret = t7xx_dpmaif_hw_init(hw_info, &hw_init_para);
+ if (ret) {
+ dev_err(dpmaif_ctrl->dev, "Failed to initialize DPMAIF HW: %d\n", ret);
+ goto err_free_frag_bat;
+ }
+
+ ret = t7xx_dpmaif_dl_snd_hw_bat_cnt(hw_info, rxq->bat_req->bat_size_cnt - 1);
+ if (ret)
+ goto err_free_frag_bat;
+
+ ret = t7xx_dpmaif_dl_snd_hw_frg_cnt(hw_info, rxq->bat_frag->bat_size_cnt - 1);
+ if (ret)
+ goto err_free_frag_bat;
+
+ t7xx_dpmaif_ul_clr_all_intr(hw_info);
+ t7xx_dpmaif_dl_clr_all_intr(hw_info);
+ dpmaif_ctrl->state = DPMAIF_STATE_PWRON;
+ t7xx_dpmaif_enable_irq(dpmaif_ctrl);
+ wake_up(&dpmaif_ctrl->tx_wq);
+ return 0;
+
+err_free_frag_bat:
+ t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_frag);
+
+err_free_normal_bat:
+ t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_req);
+
+ return ret;
+}
+
+static void t7xx_dpmaif_stop_sw(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ t7xx_dpmaif_tx_stop(dpmaif_ctrl);
+ t7xx_dpmaif_rx_stop(dpmaif_ctrl);
+}
+
+static void t7xx_dpmaif_stop_hw(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ t7xx_dpmaif_hw_stop_all_txq(&dpmaif_ctrl->hw_info);
+ t7xx_dpmaif_hw_stop_all_rxq(&dpmaif_ctrl->hw_info);
+}
+
+static int t7xx_dpmaif_stop(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ if (!dpmaif_ctrl->dpmaif_sw_init_done) {
+ dev_err(dpmaif_ctrl->dev, "dpmaif SW init fail\n");
+ return -EFAULT;
+ }
+
+ if (dpmaif_ctrl->state == DPMAIF_STATE_PWROFF)
+ return -EFAULT;
+
+ t7xx_dpmaif_disable_irq(dpmaif_ctrl);
+ dpmaif_ctrl->state = DPMAIF_STATE_PWROFF;
+ t7xx_dpmaif_stop_sw(dpmaif_ctrl);
+ t7xx_dpmaif_tx_clear(dpmaif_ctrl);
+ t7xx_dpmaif_rx_clear(dpmaif_ctrl);
+ return 0;
+}
+
+int t7xx_dpmaif_md_state_callback(struct dpmaif_ctrl *dpmaif_ctrl, enum md_state state)
+{
+ int ret = 0;
+
+ switch (state) {
+ case MD_STATE_WAITING_FOR_HS1:
+ ret = t7xx_dpmaif_start(dpmaif_ctrl);
+ break;
+
+ case MD_STATE_EXCEPTION:
+ ret = t7xx_dpmaif_stop(dpmaif_ctrl);
+ break;
+
+ case MD_STATE_STOPPED:
+ ret = t7xx_dpmaif_stop(dpmaif_ctrl);
+ break;
+
+ case MD_STATE_WAITING_TO_STOP:
+ t7xx_dpmaif_stop_hw(dpmaif_ctrl);
+ break;
+
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * t7xx_dpmaif_hif_init() - Initialize data path.
+ * @t7xx_dev: MTK context structure.
+ * @callbacks: Callbacks implemented by the network layer to handle RX skb and
+ * event notifications.
+ *
+ * Allocate and initialize datapath control block.
+ * Register datapath ISR, TX and RX resources.
+ *
+ * Return:
+ * * dpmaif_ctrl pointer - Pointer to DPMAIF context structure.
+ * * NULL - In case of error.
+ */
+struct dpmaif_ctrl *t7xx_dpmaif_hif_init(struct t7xx_pci_dev *t7xx_dev,
+ struct dpmaif_callbacks *callbacks)
+{
+ struct device *dev = &t7xx_dev->pdev->dev;
+ struct dpmaif_ctrl *dpmaif_ctrl;
+ int ret;
+
+ if (!callbacks)
+ return NULL;
+
+ dpmaif_ctrl = devm_kzalloc(dev, sizeof(*dpmaif_ctrl), GFP_KERNEL);
+ if (!dpmaif_ctrl)
+ return NULL;
+
+ dpmaif_ctrl->t7xx_dev = t7xx_dev;
+ dpmaif_ctrl->callbacks = callbacks;
+ dpmaif_ctrl->dev = dev;
+ dpmaif_ctrl->dpmaif_sw_init_done = false;
+ dpmaif_ctrl->hw_info.dev = dev;
+ dpmaif_ctrl->hw_info.pcie_base = t7xx_dev->base_addr.pcie_ext_reg_base -
+ t7xx_dev->base_addr.pcie_dev_reg_trsl_addr;
+
+ t7xx_dpmaif_register_pcie_irq(dpmaif_ctrl);
+ t7xx_dpmaif_disable_irq(dpmaif_ctrl);
+
+ ret = t7xx_dpmaif_rxtx_sw_allocs(dpmaif_ctrl);
+ if (ret) {
+ dev_err(dev, "Failed to allocate RX/TX SW resources: %d\n", ret);
+ return NULL;
+ }
+
+ dpmaif_ctrl->dpmaif_sw_init_done = true;
+ return dpmaif_ctrl;
+}
+
+void t7xx_dpmaif_hif_exit(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ if (dpmaif_ctrl->dpmaif_sw_init_done) {
+ t7xx_dpmaif_stop(dpmaif_ctrl);
+ t7xx_dpmaif_sw_release(dpmaif_ctrl);
+ dpmaif_ctrl->dpmaif_sw_init_done = false;
+ }
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h
new file mode 100644
index 000000000000..1d5de7ceeeca
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.h
@@ -0,0 +1,205 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_HIF_DPMAIF_H__
+#define __T7XX_HIF_DPMAIF_H__
+
+#include <linux/bitmap.h>
+#include <linux/mm_types.h>
+#include <linux/sched.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_dpmaif.h"
+#include "t7xx_pci.h"
+#include "t7xx_state_monitor.h"
+
+/* SKB control buffer */
+struct t7xx_skb_cb {
+ u8 netif_idx;
+ u8 txq_number;
+ u8 rx_pkt_type;
+};
+
+#define T7XX_SKB_CB(__skb) ((struct t7xx_skb_cb *)(__skb)->cb)
+
+enum dpmaif_rdwr {
+ DPMAIF_READ,
+ DPMAIF_WRITE,
+};
+
+/* Structure of DL BAT */
+struct dpmaif_cur_rx_skb_info {
+ bool msg_pit_received;
+ struct sk_buff *cur_skb;
+ unsigned int cur_chn_idx;
+ unsigned int check_sum;
+ unsigned int pit_dp;
+ unsigned int pkt_type;
+ int err_payload;
+};
+
+struct dpmaif_bat {
+ unsigned int p_buffer_addr;
+ unsigned int buffer_addr_ext;
+};
+
+struct dpmaif_bat_skb {
+ struct sk_buff *skb;
+ dma_addr_t data_bus_addr;
+ unsigned int data_len;
+};
+
+struct dpmaif_bat_page {
+ struct page *page;
+ dma_addr_t data_bus_addr;
+ unsigned int offset;
+ unsigned int data_len;
+};
+
+enum bat_type {
+ BAT_TYPE_NORMAL,
+ BAT_TYPE_FRAG,
+};
+
+struct dpmaif_bat_request {
+ void *bat_base;
+ dma_addr_t bat_bus_addr;
+ unsigned int bat_size_cnt;
+ unsigned int bat_wr_idx;
+ unsigned int bat_release_rd_idx;
+ void *bat_skb;
+ unsigned int pkt_buf_sz;
+ unsigned long *bat_bitmap;
+ atomic_t refcnt;
+ spinlock_t mask_lock; /* Protects BAT mask */
+ enum bat_type type;
+};
+
+struct dpmaif_rx_queue {
+ unsigned int index;
+ bool que_started;
+ unsigned int budget;
+
+ void *pit_base;
+ dma_addr_t pit_bus_addr;
+ unsigned int pit_size_cnt;
+
+ unsigned int pit_rd_idx;
+ unsigned int pit_wr_idx;
+ unsigned int pit_release_rd_idx;
+
+ struct dpmaif_bat_request *bat_req;
+ struct dpmaif_bat_request *bat_frag;
+
+ wait_queue_head_t rx_wq;
+ struct task_struct *rx_thread;
+ struct sk_buff_head skb_list;
+ unsigned int skb_list_max_len;
+
+ struct workqueue_struct *worker;
+ struct work_struct dpmaif_rxq_work;
+
+ atomic_t rx_processing;
+
+ struct dpmaif_ctrl *dpmaif_ctrl;
+ unsigned int expect_pit_seq;
+ unsigned int pit_remain_release_cnt;
+ struct dpmaif_cur_rx_skb_info rx_data_info;
+};
+
+struct dpmaif_tx_queue {
+ unsigned int index;
+ bool que_started;
+ atomic_t tx_budget;
+ void *drb_base;
+ dma_addr_t drb_bus_addr;
+ unsigned int drb_size_cnt;
+ unsigned int drb_wr_idx;
+ unsigned int drb_rd_idx;
+ unsigned int drb_release_rd_idx;
+ void *drb_skb_base;
+ wait_queue_head_t req_wq;
+ struct workqueue_struct *worker;
+ struct work_struct dpmaif_tx_work;
+ spinlock_t tx_lock; /* Protects txq DRB */
+ atomic_t tx_processing;
+
+ struct dpmaif_ctrl *dpmaif_ctrl;
+ struct sk_buff_head tx_skb_head;
+};
+
+struct dpmaif_isr_para {
+ struct dpmaif_ctrl *dpmaif_ctrl;
+ unsigned char pcie_int;
+ unsigned char dlq_id;
+};
+
+enum dpmaif_state {
+ DPMAIF_STATE_MIN,
+ DPMAIF_STATE_PWROFF,
+ DPMAIF_STATE_PWRON,
+ DPMAIF_STATE_EXCEPTION,
+ DPMAIF_STATE_MAX
+};
+
+enum dpmaif_txq_state {
+ DMPAIF_TXQ_STATE_IRQ,
+ DMPAIF_TXQ_STATE_FULL,
+};
+
+struct dpmaif_callbacks {
+ void (*state_notify)(struct t7xx_pci_dev *t7xx_dev,
+ enum dpmaif_txq_state state, int txq_number);
+ void (*recv_skb)(struct t7xx_pci_dev *t7xx_dev, struct sk_buff *skb);
+};
+
+struct dpmaif_ctrl {
+ struct device *dev;
+ struct t7xx_pci_dev *t7xx_dev;
+ enum dpmaif_state state;
+ bool dpmaif_sw_init_done;
+ struct dpmaif_hw_info hw_info;
+ struct dpmaif_tx_queue txq[DPMAIF_TXQ_NUM];
+ struct dpmaif_rx_queue rxq[DPMAIF_RXQ_NUM];
+
+ unsigned char rxq_int_mapping[DPMAIF_RXQ_NUM];
+ struct dpmaif_isr_para isr_para[DPMAIF_RXQ_NUM];
+
+ struct dpmaif_bat_request bat_req;
+ struct dpmaif_bat_request bat_frag;
+ struct workqueue_struct *bat_release_wq;
+ struct work_struct bat_release_work;
+
+ wait_queue_head_t tx_wq;
+ struct task_struct *tx_thread;
+
+ struct dpmaif_callbacks *callbacks;
+};
+
+struct dpmaif_ctrl *t7xx_dpmaif_hif_init(struct t7xx_pci_dev *t7xx_dev,
+ struct dpmaif_callbacks *callbacks);
+void t7xx_dpmaif_hif_exit(struct dpmaif_ctrl *dpmaif_ctrl);
+int t7xx_dpmaif_md_state_callback(struct dpmaif_ctrl *dpmaif_ctrl, enum md_state state);
+unsigned int t7xx_ring_buf_get_next_wr_idx(unsigned int buf_len, unsigned int buf_idx);
+unsigned int t7xx_ring_buf_rd_wr_count(unsigned int total_cnt, unsigned int rd_idx,
+ unsigned int wr_idx, enum dpmaif_rdwr);
+
+#endif /* __T7XX_HIF_DPMAIF_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.c b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.c
new file mode 100644
index 000000000000..d110f7edf56b
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.c
@@ -0,0 +1,1220 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Andy Shevchenko <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/dma-direction.h>
+#include <linux/dma-mapping.h>
+#include <linux/gfp.h>
+#include <linux/err.h>
+#include <linux/iopoll.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/minmax.h>
+#include <linux/mm.h>
+#include <linux/netdevice.h>
+#include <linux/sched.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_dpmaif.h"
+#include "t7xx_hif_dpmaif.h"
+#include "t7xx_hif_dpmaif_rx.h"
+#include "t7xx_pci.h"
+
+#define DPMAIF_BAT_COUNT 8192
+#define DPMAIF_FRG_COUNT 4814
+#define DPMAIF_PIT_COUNT (DPMAIF_BAT_COUNT * 2)
+
+#define DPMAIF_BAT_CNT_THRESHOLD 30
+#define DPMAIF_PIT_CNT_THRESHOLD 60
+#define DPMAIF_RX_PUSH_THRESHOLD_MASK GENMASK(2, 0)
+#define DPMAIF_NOTIFY_RELEASE_COUNT 128
+#define DPMAIF_POLL_PIT_TIME_US 20
+#define DPMAIF_POLL_PIT_MAX_TIME_US 2000
+#define DPMAIF_WQ_TIME_LIMIT_MS 2
+#define DPMAIF_CS_RESULT_PASS 0
+
+/* Packet type */
+#define DES_PT_PD 0
+#define DES_PT_MSG 1
+/* Buffer type */
+#define PKT_BUF_FRAG 1
+
+static unsigned int t7xx_normal_pit_bid(const struct dpmaif_pit *pit_info)
+{
+ u32 value;
+
+ value = FIELD_GET(PD_PIT_H_BID, le32_to_cpu(pit_info->pd.footer));
+ value <<= 13;
+ value += FIELD_GET(PD_PIT_BUFFER_ID, le32_to_cpu(pit_info->header));
+ return value;
+}
+
+static int t7xx_dpmaif_net_rx_push_thread(void *arg)
+{
+ struct dpmaif_rx_queue *q = arg;
+ struct dpmaif_ctrl *hif_ctrl;
+ struct dpmaif_callbacks *cb;
+
+ hif_ctrl = q->dpmaif_ctrl;
+ cb = hif_ctrl->callbacks;
+
+ while (!kthread_should_stop()) {
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ if (skb_queue_empty(&q->skb_list)) {
+ if (wait_event_interruptible(q->rx_wq,
+ !skb_queue_empty(&q->skb_list) ||
+ kthread_should_stop()))
+ continue;
+
+ if (kthread_should_stop())
+ break;
+ }
+
+ spin_lock_irqsave(&q->skb_list.lock, flags);
+ skb = __skb_dequeue(&q->skb_list);
+ spin_unlock_irqrestore(&q->skb_list.lock, flags);
+
+ if (!skb)
+ continue;
+
+ cb->recv_skb(hif_ctrl->t7xx_dev, skb);
+ cond_resched();
+ }
+
+ return 0;
+}
+
+static int t7xx_dpmaif_update_bat_wr_idx(struct dpmaif_ctrl *dpmaif_ctrl,
+ const unsigned int q_num, const unsigned int bat_cnt)
+{
+ struct dpmaif_rx_queue *rxq = &dpmaif_ctrl->rxq[q_num];
+ struct dpmaif_bat_request *bat_req = rxq->bat_req;
+ unsigned int old_rl_idx, new_wr_idx, old_wr_idx;
+
+ if (!rxq->que_started) {
+ dev_err(dpmaif_ctrl->dev, "RX queue %d has not been started\n", rxq->index);
+ return -EINVAL;
+ }
+
+ old_rl_idx = bat_req->bat_release_rd_idx;
+ old_wr_idx = bat_req->bat_wr_idx;
+ new_wr_idx = old_wr_idx + bat_cnt;
+
+ if (old_rl_idx > old_wr_idx && new_wr_idx >= old_rl_idx)
+ goto err_flow;
+
+ if (new_wr_idx >= bat_req->bat_size_cnt) {
+ new_wr_idx -= bat_req->bat_size_cnt;
+ if (new_wr_idx >= old_rl_idx)
+ goto err_flow;
+ }
+
+ bat_req->bat_wr_idx = new_wr_idx;
+ return 0;
+
+err_flow:
+ dev_err(dpmaif_ctrl->dev, "RX BAT flow check fail\n");
+ return -EINVAL;
+}
+
+static bool t7xx_alloc_and_map_skb_info(const struct dpmaif_ctrl *dpmaif_ctrl,
+ const unsigned int size, struct dpmaif_bat_skb *cur_skb)
+{
+ dma_addr_t data_bus_addr;
+ struct sk_buff *skb;
+ size_t data_len;
+
+ skb = __dev_alloc_skb(size, GFP_KERNEL);
+ if (!skb)
+ return false;
+
+ data_len = skb_data_area_size(skb);
+ data_bus_addr = dma_map_single(dpmaif_ctrl->dev, skb->data, data_len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dpmaif_ctrl->dev, data_bus_addr)) {
+ dev_err_ratelimited(dpmaif_ctrl->dev, "DMA mapping error\n");
+ dev_kfree_skb_any(skb);
+ return false;
+ }
+
+ cur_skb->skb = skb;
+ cur_skb->data_bus_addr = data_bus_addr;
+ cur_skb->data_len = data_len;
+
+ return true;
+}
+
+static void t7xx_unmap_bat_skb(struct device *dev, struct dpmaif_bat_skb *bat_skb_base,
+ unsigned int index)
+{
+ struct dpmaif_bat_skb *bat_skb = bat_skb_base + index;
+
+ if (bat_skb->skb) {
+ dma_unmap_single(dev, bat_skb->data_bus_addr, bat_skb->data_len, DMA_FROM_DEVICE);
+ dev_kfree_skb(bat_skb->skb);
+ bat_skb->skb = NULL;
+ }
+}
+
+/**
+ * t7xx_dpmaif_rx_buf_alloc() - Allocate buffers for the BAT ring.
+ * @dpmaif_ctrl: Pointer to DPMAIF context structure.
+ * @bat_req: Pointer to BAT request structure.
+ * @q_num: Queue number.
+ * @buf_cnt: Number of buffers to allocate.
+ * @initial: Indicates if the ring is being populated for the first time.
+ *
+ * Allocate skb and store the start address of the data buffer into the BAT ring.
+ * If this is not the initial call, notify the HW about the new entries.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ERROR - Error code.
+ */
+int t7xx_dpmaif_rx_buf_alloc(struct dpmaif_ctrl *dpmaif_ctrl,
+ const struct dpmaif_bat_request *bat_req,
+ const unsigned int q_num, const unsigned int buf_cnt,
+ const bool initial)
+{
+ unsigned int i, bat_cnt, bat_max_cnt, bat_start_idx;
+ int ret;
+
+ if (!buf_cnt || buf_cnt > bat_req->bat_size_cnt)
+ return -EINVAL;
+
+ /* Check BAT buffer space */
+ bat_max_cnt = bat_req->bat_size_cnt;
+
+ bat_cnt = t7xx_ring_buf_rd_wr_count(bat_max_cnt, bat_req->bat_release_rd_idx,
+ bat_req->bat_wr_idx, DPMAIF_WRITE);
+ if (buf_cnt > bat_cnt)
+ return -ENOMEM;
+
+ bat_start_idx = bat_req->bat_wr_idx;
+
+ for (i = 0; i < buf_cnt; i++) {
+ unsigned int cur_bat_idx = bat_start_idx + i;
+ struct dpmaif_bat_skb *cur_skb;
+ struct dpmaif_bat *cur_bat;
+
+ if (cur_bat_idx >= bat_max_cnt)
+ cur_bat_idx -= bat_max_cnt;
+
+ cur_skb = (struct dpmaif_bat_skb *)bat_req->bat_skb + cur_bat_idx;
+ if (!cur_skb->skb &&
+ !t7xx_alloc_and_map_skb_info(dpmaif_ctrl, bat_req->pkt_buf_sz, cur_skb))
+ break;
+
+ cur_bat = (struct dpmaif_bat *)bat_req->bat_base + cur_bat_idx;
+ cur_bat->buffer_addr_ext = upper_32_bits(cur_skb->data_bus_addr);
+ cur_bat->p_buffer_addr = lower_32_bits(cur_skb->data_bus_addr);
+ }
+
+ if (!i)
+ return -ENOMEM;
+
+ ret = t7xx_dpmaif_update_bat_wr_idx(dpmaif_ctrl, q_num, i);
+ if (ret)
+ goto err_unmap_skbs;
+
+ if (!initial) {
+ unsigned int hw_wr_idx;
+
+ ret = t7xx_dpmaif_dl_snd_hw_bat_cnt(&dpmaif_ctrl->hw_info, i);
+ if (ret)
+ goto err_unmap_skbs;
+
+ hw_wr_idx = t7xx_dpmaif_dl_get_bat_wr_idx(&dpmaif_ctrl->hw_info,
+ DPF_RX_QNO_DFT);
+ if (hw_wr_idx != bat_req->bat_wr_idx) {
+ ret = -EFAULT;
+ dev_err(dpmaif_ctrl->dev, "Write index mismatch in RX ring\n");
+ goto err_unmap_skbs;
+ }
+ }
+
+ return 0;
+
+err_unmap_skbs:
+ while (--i > 0)
+ t7xx_unmap_bat_skb(dpmaif_ctrl->dev, bat_req->bat_skb, i);
+
+ return ret;
+}
+
+static int t7xx_dpmaifq_release_pit_entry(struct dpmaif_rx_queue *rxq,
+ const unsigned int rel_entry_num)
+{
+ struct dpmaif_hw_info *hw_info = &rxq->dpmaif_ctrl->hw_info;
+ unsigned int old_rel_idx, new_rel_idx, hw_wr_idx;
+ int ret;
+
+ if (!rxq->que_started)
+ return 0;
+
+ if (rel_entry_num >= rxq->pit_size_cnt) {
+ dev_err(rxq->dpmaif_ctrl->dev, "Invalid PIT release index\n");
+ return -EINVAL;
+ }
+
+ old_rel_idx = rxq->pit_release_rd_idx;
+ new_rel_idx = old_rel_idx + rel_entry_num;
+ hw_wr_idx = rxq->pit_wr_idx;
+ if (hw_wr_idx < old_rel_idx && new_rel_idx >= rxq->pit_size_cnt)
+ new_rel_idx -= rxq->pit_size_cnt;
+
+ ret = t7xx_dpmaif_dlq_add_pit_remain_cnt(hw_info, rxq->index, rel_entry_num);
+ if (ret) {
+ dev_err(rxq->dpmaif_ctrl->dev, "PIT release failure: %d\n", ret);
+ return ret;
+ }
+
+ rxq->pit_release_rd_idx = new_rel_idx;
+ return 0;
+}
+
+static void t7xx_dpmaif_set_bat_mask(struct dpmaif_bat_request *bat_req, unsigned int idx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&bat_req->mask_lock, flags);
+ set_bit(idx, bat_req->bat_bitmap);
+ spin_unlock_irqrestore(&bat_req->mask_lock, flags);
+}
+
+static int t7xx_frag_bat_cur_bid_check(struct dpmaif_rx_queue *rxq,
+ const unsigned int cur_bid)
+{
+ struct dpmaif_bat_request *bat_frag = rxq->bat_frag;
+ struct dpmaif_bat_page *bat_page;
+
+ if (cur_bid >= DPMAIF_FRG_COUNT)
+ return -EINVAL;
+
+ bat_page = bat_frag->bat_skb + cur_bid;
+ if (!bat_page->page)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void t7xx_unmap_bat_page(struct device *dev, struct dpmaif_bat_page *bat_page_base,
+ unsigned int index)
+{
+ struct dpmaif_bat_page *bat_page = bat_page_base + index;
+
+ if (bat_page->page) {
+ dma_unmap_page(dev, bat_page->data_bus_addr, bat_page->data_len, DMA_FROM_DEVICE);
+ put_page(bat_page->page);
+ bat_page->page = NULL;
+ }
+}
+
+/**
+ * t7xx_dpmaif_rx_frag_alloc() - Allocates buffers for the Fragment BAT ring.
+ * @dpmaif_ctrl: Pointer to DPMAIF context structure.
+ * @bat_req: Pointer to BAT request structure.
+ * @buf_cnt: Number of buffers to allocate.
+ * @initial: Indicates if the ring is being populated for the first time.
+ *
+ * Fragment BAT is used when the received packet does not fit in a normal BAT entry.
+ * This function allocates a page fragment and stores the start address of the page
+ * into the Fragment BAT ring.
+ * If this is not the initial call, notify the HW about the new entries.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ERROR - Error code.
+ */
+int t7xx_dpmaif_rx_frag_alloc(struct dpmaif_ctrl *dpmaif_ctrl, struct dpmaif_bat_request *bat_req,
+ const unsigned int buf_cnt, const bool initial)
+{
+ unsigned int buf_space, cur_bat_idx = bat_req->bat_wr_idx;
+ struct dpmaif_bat_page *bat_skb = bat_req->bat_skb;
+ int ret = 0, i;
+
+ if (!buf_cnt || buf_cnt > bat_req->bat_size_cnt)
+ return -EINVAL;
+
+ buf_space = t7xx_ring_buf_rd_wr_count(bat_req->bat_size_cnt,
+ bat_req->bat_release_rd_idx, bat_req->bat_wr_idx,
+ DPMAIF_WRITE);
+ if (buf_cnt > buf_space) {
+ dev_err(dpmaif_ctrl->dev,
+ "Requested more buffers than the space available in RX frag ring\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < buf_cnt; i++) {
+ struct dpmaif_bat_page *cur_page = bat_skb + cur_bat_idx;
+ struct dpmaif_bat *cur_bat;
+ dma_addr_t data_base_addr;
+
+ if (!cur_page->page) {
+ unsigned long offset;
+ struct page *page;
+ void *data;
+
+ data = netdev_alloc_frag(bat_req->pkt_buf_sz);
+ if (!data)
+ break;
+
+ page = virt_to_head_page(data);
+ offset = data - page_address(page);
+
+ data_base_addr = dma_map_page(dpmaif_ctrl->dev, page, offset,
+ bat_req->pkt_buf_sz, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dpmaif_ctrl->dev, data_base_addr)) {
+ put_page(virt_to_head_page(data));
+ dev_err(dpmaif_ctrl->dev, "DMA mapping fail\n");
+ break;
+ }
+
+ cur_page->page = page;
+ cur_page->data_bus_addr = data_base_addr;
+ cur_page->offset = offset;
+ cur_page->data_len = bat_req->pkt_buf_sz;
+ }
+
+ data_base_addr = cur_page->data_bus_addr;
+ cur_bat = (struct dpmaif_bat *)bat_req->bat_base + cur_bat_idx;
+ cur_bat->buffer_addr_ext = upper_32_bits(data_base_addr);
+ cur_bat->p_buffer_addr = lower_32_bits(data_base_addr);
+ cur_bat_idx = t7xx_ring_buf_get_next_wr_idx(bat_req->bat_size_cnt, cur_bat_idx);
+ }
+
+ bat_req->bat_wr_idx = cur_bat_idx;
+
+ if (!initial)
+ t7xx_dpmaif_dl_snd_hw_frg_cnt(&dpmaif_ctrl->hw_info, i);
+
+ if (i < buf_cnt) {
+ ret = -ENOMEM;
+ if (initial) {
+ while (--i > 0)
+ t7xx_unmap_bat_page(dpmaif_ctrl->dev, bat_req->bat_skb, i);
+ }
+ }
+
+ return ret;
+}
+
+static int t7xx_dpmaif_set_frag_to_skb(const struct dpmaif_rx_queue *rxq,
+ const struct dpmaif_pit *pkt_info,
+ struct sk_buff *skb)
+{
+ unsigned long long data_bus_addr, data_base_addr;
+ struct device *dev = rxq->dpmaif_ctrl->dev;
+ struct dpmaif_bat_page *page_info;
+ unsigned int data_len;
+ int data_offset;
+
+ page_info = rxq->bat_frag->bat_skb;
+ page_info += t7xx_normal_pit_bid(pkt_info);
+ dma_unmap_page(dev, page_info->data_bus_addr, page_info->data_len, DMA_FROM_DEVICE);
+
+ if (!page_info->page)
+ return -EINVAL;
+
+ data_bus_addr = le32_to_cpu(pkt_info->pd.data_addr_h);
+ data_bus_addr = (data_bus_addr << 32) + le32_to_cpu(pkt_info->pd.data_addr_l);
+ data_base_addr = page_info->data_bus_addr;
+ data_offset = data_bus_addr - data_base_addr;
+ data_offset += page_info->offset;
+ data_len = FIELD_GET(PD_PIT_DATA_LEN, le32_to_cpu(pkt_info->header));
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page_info->page,
+ data_offset, data_len, page_info->data_len);
+
+ page_info->page = NULL;
+ page_info->offset = 0;
+ page_info->data_len = 0;
+ return 0;
+}
+
+static int t7xx_dpmaif_get_frag(struct dpmaif_rx_queue *rxq,
+ const struct dpmaif_pit *pkt_info,
+ const struct dpmaif_cur_rx_skb_info *skb_info)
+{
+ unsigned int cur_bid = t7xx_normal_pit_bid(pkt_info);
+ int ret;
+
+ ret = t7xx_frag_bat_cur_bid_check(rxq, cur_bid);
+ if (ret < 0)
+ return ret;
+
+ ret = t7xx_dpmaif_set_frag_to_skb(rxq, pkt_info, skb_info->cur_skb);
+ if (ret < 0) {
+ dev_err(rxq->dpmaif_ctrl->dev, "Failed to set frag data to skb: %d\n", ret);
+ return ret;
+ }
+
+ t7xx_dpmaif_set_bat_mask(rxq->bat_frag, cur_bid);
+ return 0;
+}
+
+static int t7xx_bat_cur_bid_check(struct dpmaif_rx_queue *rxq, const unsigned int cur_bid)
+{
+ struct dpmaif_bat_skb *bat_skb = rxq->bat_req->bat_skb;
+
+ bat_skb += cur_bid;
+ if (cur_bid >= DPMAIF_BAT_COUNT || !bat_skb->skb)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int t7xx_dpmaif_read_pit_seq(const struct dpmaif_pit *pit)
+{
+ return FIELD_GET(PD_PIT_PIT_SEQ, le32_to_cpu(pit->pd.footer));
+}
+
+static int t7xx_dpmaif_check_pit_seq(struct dpmaif_rx_queue *rxq,
+ const struct dpmaif_pit *pit)
+{
+ unsigned int cur_pit_seq, expect_pit_seq = rxq->expect_pit_seq;
+
+ if (read_poll_timeout_atomic(t7xx_dpmaif_read_pit_seq, cur_pit_seq,
+ cur_pit_seq == expect_pit_seq, DPMAIF_POLL_PIT_TIME_US,
+ DPMAIF_POLL_PIT_MAX_TIME_US, false, pit))
+ return -EFAULT;
+
+ rxq->expect_pit_seq++;
+ if (rxq->expect_pit_seq >= DPMAIF_DL_PIT_SEQ_VALUE)
+ rxq->expect_pit_seq = 0;
+
+ return 0;
+}
+
+static unsigned int t7xx_dpmaif_avail_pkt_bat_cnt(struct dpmaif_bat_request *bat_req)
+{
+ unsigned int zero_index;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bat_req->mask_lock, flags);
+
+ zero_index = find_next_zero_bit(bat_req->bat_bitmap, bat_req->bat_size_cnt,
+ bat_req->bat_release_rd_idx);
+
+ if (zero_index < bat_req->bat_size_cnt) {
+ spin_unlock_irqrestore(&bat_req->mask_lock, flags);
+ return zero_index - bat_req->bat_release_rd_idx;
+ }
+
+ /* limiting the search till bat_release_rd_idx */
+ zero_index = find_first_zero_bit(bat_req->bat_bitmap, bat_req->bat_release_rd_idx);
+ spin_unlock_irqrestore(&bat_req->mask_lock, flags);
+ return bat_req->bat_size_cnt - bat_req->bat_release_rd_idx + zero_index;
+}
+
+static int t7xx_dpmaif_release_bat_entry(const struct dpmaif_rx_queue *rxq,
+ const unsigned int rel_entry_num,
+ const enum bat_type buf_type)
+{
+ struct dpmaif_hw_info *hw_info = &rxq->dpmaif_ctrl->hw_info;
+ unsigned int old_rel_idx, new_rel_idx, hw_rd_idx, i;
+ struct dpmaif_bat_request *bat;
+ unsigned long flags;
+
+ if (!rxq->que_started || !rel_entry_num)
+ return -EINVAL;
+
+ if (buf_type == BAT_TYPE_FRAG) {
+ bat = rxq->bat_frag;
+ hw_rd_idx = t7xx_dpmaif_dl_get_frg_rd_idx(hw_info, rxq->index);
+ } else {
+ bat = rxq->bat_req;
+ hw_rd_idx = t7xx_dpmaif_dl_get_bat_rd_idx(hw_info, rxq->index);
+ }
+
+ if (rel_entry_num >= bat->bat_size_cnt)
+ return -EINVAL;
+
+ old_rel_idx = bat->bat_release_rd_idx;
+ new_rel_idx = old_rel_idx + rel_entry_num;
+
+ /* Do not need to release if the queue is empty */
+ if (bat->bat_wr_idx == old_rel_idx)
+ return 0;
+
+ if (hw_rd_idx >= old_rel_idx) {
+ if (new_rel_idx > hw_rd_idx)
+ return -EINVAL;
+ }
+
+ if (new_rel_idx >= bat->bat_size_cnt) {
+ new_rel_idx -= bat->bat_size_cnt;
+ if (new_rel_idx > hw_rd_idx)
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&bat->mask_lock, flags);
+ for (i = 0; i < rel_entry_num; i++) {
+ unsigned int index = bat->bat_release_rd_idx + i;
+
+ if (index >= bat->bat_size_cnt)
+ index -= bat->bat_size_cnt;
+
+ clear_bit(index, bat->bat_bitmap);
+ }
+ spin_unlock_irqrestore(&bat->mask_lock, flags);
+
+ bat->bat_release_rd_idx = new_rel_idx;
+ return rel_entry_num;
+}
+
+static int t7xx_dpmaif_pit_release_and_add(struct dpmaif_rx_queue *rxq)
+{
+ int ret;
+
+ if (rxq->pit_remain_release_cnt < DPMAIF_PIT_CNT_THRESHOLD)
+ return 0;
+
+ ret = t7xx_dpmaifq_release_pit_entry(rxq, rxq->pit_remain_release_cnt);
+ if (ret)
+ return ret;
+
+ rxq->pit_remain_release_cnt = 0;
+ return 0;
+}
+
+static int t7xx_dpmaif_bat_release_and_add(const struct dpmaif_rx_queue *rxq)
+{
+ unsigned int bid_cnt;
+ int ret;
+
+ bid_cnt = t7xx_dpmaif_avail_pkt_bat_cnt(rxq->bat_req);
+ if (bid_cnt < DPMAIF_BAT_CNT_THRESHOLD)
+ return 0;
+
+ ret = t7xx_dpmaif_release_bat_entry(rxq, bid_cnt, BAT_TYPE_NORMAL);
+ if (ret <= 0) {
+ dev_err(rxq->dpmaif_ctrl->dev, "Release PKT BAT failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = t7xx_dpmaif_rx_buf_alloc(rxq->dpmaif_ctrl, rxq->bat_req, rxq->index, bid_cnt, false);
+ if (ret < 0)
+ dev_err(rxq->dpmaif_ctrl->dev, "Allocate new RX buffer failed: %d\n", ret);
+
+ return ret;
+}
+
+static int t7xx_dpmaif_frag_bat_release_and_add(const struct dpmaif_rx_queue *rxq)
+{
+ unsigned int bid_cnt;
+ int ret;
+
+ bid_cnt = t7xx_dpmaif_avail_pkt_bat_cnt(rxq->bat_frag);
+ if (bid_cnt < DPMAIF_BAT_CNT_THRESHOLD)
+ return 0;
+
+ ret = t7xx_dpmaif_release_bat_entry(rxq, bid_cnt, BAT_TYPE_FRAG);
+ if (ret <= 0) {
+ dev_err(rxq->dpmaif_ctrl->dev, "Release BAT entry failed: %d\n", ret);
+ return ret;
+ }
+
+ return t7xx_dpmaif_rx_frag_alloc(rxq->dpmaif_ctrl, rxq->bat_frag, bid_cnt, false);
+}
+
+static void t7xx_dpmaif_parse_msg_pit(const struct dpmaif_rx_queue *rxq,
+ const struct dpmaif_pit *msg_pit,
+ struct dpmaif_cur_rx_skb_info *skb_info)
+{
+ int header = le32_to_cpu(msg_pit->header);
+
+ skb_info->cur_chn_idx = FIELD_GET(MSG_PIT_CHANNEL_ID, header);
+ skb_info->check_sum = FIELD_GET(MSG_PIT_CHECKSUM, header);
+ skb_info->pit_dp = FIELD_GET(MSG_PIT_DP, header);
+ skb_info->pkt_type = FIELD_GET(MSG_PIT_IP, le32_to_cpu(msg_pit->msg.params_3));
+}
+
+static int t7xx_dpmaif_set_data_to_skb(const struct dpmaif_rx_queue *rxq,
+ const struct dpmaif_pit *pkt_info,
+ struct dpmaif_cur_rx_skb_info *skb_info)
+{
+ unsigned long long data_bus_addr, data_base_addr;
+ struct device *dev = rxq->dpmaif_ctrl->dev;
+ struct dpmaif_bat_skb *bat_skb;
+ unsigned int data_len;
+ struct sk_buff *skb;
+ int data_offset;
+
+ bat_skb = rxq->bat_req->bat_skb;
+ bat_skb += t7xx_normal_pit_bid(pkt_info);
+ dma_unmap_single(dev, bat_skb->data_bus_addr, bat_skb->data_len, DMA_FROM_DEVICE);
+
+ data_bus_addr = le32_to_cpu(pkt_info->pd.data_addr_h);
+ data_bus_addr = (data_bus_addr << 32) + le32_to_cpu(pkt_info->pd.data_addr_l);
+ data_base_addr = bat_skb->data_bus_addr;
+ data_offset = data_bus_addr - data_base_addr;
+ data_len = FIELD_GET(PD_PIT_DATA_LEN, le32_to_cpu(pkt_info->header));
+ skb = bat_skb->skb;
+ skb->len = 0;
+ skb_reset_tail_pointer(skb);
+ skb_reserve(skb, data_offset);
+
+ if (skb->tail + data_len > skb->end) {
+ dev_err(dev, "No buffer space available\n");
+ return -ENOBUFS;
+ }
+
+ skb_put(skb, data_len);
+ skb_info->cur_skb = skb;
+ bat_skb->skb = NULL;
+ return 0;
+}
+
+static int t7xx_dpmaif_get_rx_pkt(struct dpmaif_rx_queue *rxq,
+ const struct dpmaif_pit *pkt_info,
+ struct dpmaif_cur_rx_skb_info *skb_info)
+{
+ unsigned int cur_bid = t7xx_normal_pit_bid(pkt_info);
+ int ret;
+
+ ret = t7xx_bat_cur_bid_check(rxq, cur_bid);
+ if (ret < 0)
+ return ret;
+
+ ret = t7xx_dpmaif_set_data_to_skb(rxq, pkt_info, skb_info);
+ if (ret < 0) {
+ dev_err(rxq->dpmaif_ctrl->dev, "RX set data to skb failed: %d\n", ret);
+ return ret;
+ }
+
+ t7xx_dpmaif_set_bat_mask(rxq->bat_req, cur_bid);
+ return 0;
+}
+
+static int t7xx_dpmaifq_rx_notify_hw(struct dpmaif_rx_queue *rxq)
+{
+ struct dpmaif_ctrl *dpmaif_ctrl = rxq->dpmaif_ctrl;
+ int ret;
+
+ queue_work(dpmaif_ctrl->bat_release_wq, &dpmaif_ctrl->bat_release_work);
+
+ ret = t7xx_dpmaif_pit_release_and_add(rxq);
+ if (ret < 0)
+ dev_err(dpmaif_ctrl->dev, "RXQ%u update PIT failed: %d\n", rxq->index, ret);
+
+ return ret;
+}
+
+static void t7xx_dpmaif_rx_skb_enqueue(struct dpmaif_rx_queue *rxq, struct sk_buff *skb)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&rxq->skb_list.lock, flags);
+ if (rxq->skb_list.qlen < rxq->skb_list_max_len)
+ __skb_queue_tail(&rxq->skb_list, skb);
+ else
+ dev_kfree_skb_any(skb);
+ spin_unlock_irqrestore(&rxq->skb_list.lock, flags);
+}
+
+static void t7xx_dpmaif_rx_skb(struct dpmaif_rx_queue *rxq,
+ struct dpmaif_cur_rx_skb_info *skb_info)
+{
+ struct sk_buff *skb = skb_info->cur_skb;
+ struct t7xx_skb_cb *skb_cb;
+ u8 netif_id;
+
+ skb_info->cur_skb = NULL;
+
+ if (skb_info->pit_dp) {
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
+ skb->ip_summed = skb_info->check_sum == DPMAIF_CS_RESULT_PASS ? CHECKSUM_UNNECESSARY :
+ CHECKSUM_NONE;
+ netif_id = FIELD_GET(NETIF_MASK, skb_info->cur_chn_idx);
+ skb_cb = T7XX_SKB_CB(skb);
+ skb_cb->netif_idx = netif_id;
+ skb_cb->rx_pkt_type = skb_info->pkt_type;
+ t7xx_dpmaif_rx_skb_enqueue(rxq, skb);
+}
+
+static int t7xx_dpmaif_rx_start(struct dpmaif_rx_queue *rxq, const unsigned int pit_cnt,
+ const unsigned long timeout)
+{
+ unsigned int cur_pit, pit_len, rx_cnt, recv_skb_cnt = 0;
+ struct device *dev = rxq->dpmaif_ctrl->dev;
+ struct dpmaif_cur_rx_skb_info *skb_info;
+ int ret = 0;
+
+ pit_len = rxq->pit_size_cnt;
+ skb_info = &rxq->rx_data_info;
+ cur_pit = rxq->pit_rd_idx;
+
+ for (rx_cnt = 0; rx_cnt < pit_cnt; rx_cnt++) {
+ struct dpmaif_pit *pkt_info;
+ u32 val;
+
+ if (!skb_info->msg_pit_received && time_after_eq(jiffies, timeout))
+ break;
+
+ pkt_info = (struct dpmaif_pit *)rxq->pit_base + cur_pit;
+ if (t7xx_dpmaif_check_pit_seq(rxq, pkt_info)) {
+ dev_err_ratelimited(dev, "RXQ%u checks PIT SEQ fail\n", rxq->index);
+ return -EAGAIN;
+ }
+
+ val = FIELD_GET(PD_PIT_PACKET_TYPE, le32_to_cpu(pkt_info->header));
+ if (val == DES_PT_MSG) {
+ if (skb_info->msg_pit_received)
+ dev_err(dev, "RXQ%u received repeated PIT\n", rxq->index);
+
+ skb_info->msg_pit_received = true;
+ t7xx_dpmaif_parse_msg_pit(rxq, pkt_info, skb_info);
+ } else { /* DES_PT_PD */
+ val = FIELD_GET(PD_PIT_BUFFER_TYPE, le32_to_cpu(pkt_info->header));
+ if (val != PKT_BUF_FRAG)
+ ret = t7xx_dpmaif_get_rx_pkt(rxq, pkt_info, skb_info);
+ else if (!skb_info->cur_skb)
+ ret = -EINVAL;
+ else
+ ret = t7xx_dpmaif_get_frag(rxq, pkt_info, skb_info);
+
+ if (ret < 0) {
+ skb_info->err_payload = 1;
+ dev_err_ratelimited(dev, "RXQ%u error payload\n", rxq->index);
+ }
+
+ val = FIELD_GET(PD_PIT_CONT, le32_to_cpu(pkt_info->header));
+ if (!val) {
+ if (!skb_info->err_payload) {
+ t7xx_dpmaif_rx_skb(rxq, skb_info);
+ } else if (skb_info->cur_skb) {
+ dev_kfree_skb_any(skb_info->cur_skb);
+ skb_info->cur_skb = NULL;
+ }
+
+ memset(skb_info, 0, sizeof(*skb_info));
+
+ recv_skb_cnt++;
+ if (!(recv_skb_cnt & DPMAIF_RX_PUSH_THRESHOLD_MASK)) {
+ wake_up_all(&rxq->rx_wq);
+ recv_skb_cnt = 0;
+ }
+ }
+ }
+
+ cur_pit = t7xx_ring_buf_get_next_wr_idx(pit_len, cur_pit);
+ rxq->pit_rd_idx = cur_pit;
+ rxq->pit_remain_release_cnt++;
+
+ if (rx_cnt > 0 && !(rx_cnt % DPMAIF_NOTIFY_RELEASE_COUNT)) {
+ ret = t7xx_dpmaifq_rx_notify_hw(rxq);
+ if (ret < 0)
+ break;
+ }
+ }
+
+ if (recv_skb_cnt)
+ wake_up_all(&rxq->rx_wq);
+
+ if (!ret)
+ ret = t7xx_dpmaifq_rx_notify_hw(rxq);
+
+ if (ret)
+ return ret;
+
+ return rx_cnt;
+}
+
+static unsigned int t7xx_dpmaifq_poll_pit(struct dpmaif_rx_queue *rxq)
+{
+ unsigned int hw_wr_idx, pit_cnt;
+
+ if (!rxq->que_started)
+ return 0;
+
+ hw_wr_idx = t7xx_dpmaif_dl_dlq_pit_get_wr_idx(&rxq->dpmaif_ctrl->hw_info, rxq->index);
+ pit_cnt = t7xx_ring_buf_rd_wr_count(rxq->pit_size_cnt, rxq->pit_rd_idx, hw_wr_idx,
+ DPMAIF_READ);
+ rxq->pit_wr_idx = hw_wr_idx;
+ return pit_cnt;
+}
+
+static int t7xx_dpmaif_rx_data_collect(struct dpmaif_ctrl *dpmaif_ctrl,
+ const unsigned int q_num, const unsigned int budget)
+{
+ struct dpmaif_rx_queue *rxq = &dpmaif_ctrl->rxq[q_num];
+ unsigned long time_limit;
+ unsigned int cnt;
+
+ time_limit = jiffies + msecs_to_jiffies(DPMAIF_WQ_TIME_LIMIT_MS);
+
+ while ((cnt = t7xx_dpmaifq_poll_pit(rxq))) {
+ unsigned int rd_cnt;
+ int real_cnt;
+
+ rd_cnt = min(cnt, budget);
+
+ real_cnt = t7xx_dpmaif_rx_start(rxq, rd_cnt, time_limit);
+ if (real_cnt < 0)
+ return real_cnt;
+
+ if (real_cnt < cnt)
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+static void t7xx_dpmaif_do_rx(struct dpmaif_ctrl *dpmaif_ctrl, struct dpmaif_rx_queue *rxq)
+{
+ struct dpmaif_hw_info *hw_info = &dpmaif_ctrl->hw_info;
+ int ret;
+
+ ret = t7xx_dpmaif_rx_data_collect(dpmaif_ctrl, rxq->index, rxq->budget);
+ if (ret < 0) {
+ /* Try one more time */
+ queue_work(rxq->worker, &rxq->dpmaif_rxq_work);
+ t7xx_dpmaif_clr_ip_busy_sts(hw_info);
+ } else {
+ t7xx_dpmaif_clr_ip_busy_sts(hw_info);
+ t7xx_dpmaif_dlq_unmask_rx_done(hw_info, rxq->index);
+ }
+}
+
+static void t7xx_dpmaif_rxq_work(struct work_struct *work)
+{
+ struct dpmaif_rx_queue *rxq = container_of(work, struct dpmaif_rx_queue, dpmaif_rxq_work);
+ struct dpmaif_ctrl *dpmaif_ctrl = rxq->dpmaif_ctrl;
+
+ atomic_set(&rxq->rx_processing, 1);
+ /* Ensure rx_processing is changed to 1 before actually begin RX flow */
+ smp_mb();
+
+ if (!rxq->que_started) {
+ atomic_set(&rxq->rx_processing, 0);
+ dev_err(dpmaif_ctrl->dev, "Work RXQ: %d has not been started\n", rxq->index);
+ return;
+ }
+
+ t7xx_dpmaif_do_rx(dpmaif_ctrl, rxq);
+ atomic_set(&rxq->rx_processing, 0);
+}
+
+void t7xx_dpmaif_irq_rx_done(struct dpmaif_ctrl *dpmaif_ctrl, const unsigned int que_mask)
+{
+ struct dpmaif_rx_queue *rxq;
+ int qno;
+
+ qno = ffs(que_mask) - 1;
+ if (qno < 0 || qno > DPMAIF_RXQ_NUM - 1) {
+ dev_err(dpmaif_ctrl->dev, "Invalid RXQ number: %u\n", qno);
+ return;
+ }
+
+ rxq = &dpmaif_ctrl->rxq[qno];
+ queue_work(rxq->worker, &rxq->dpmaif_rxq_work);
+}
+
+static void t7xx_dpmaif_base_free(const struct dpmaif_ctrl *dpmaif_ctrl,
+ const struct dpmaif_bat_request *bat_req)
+{
+ if (bat_req->bat_base)
+ dma_free_coherent(dpmaif_ctrl->dev,
+ bat_req->bat_size_cnt * sizeof(struct dpmaif_bat),
+ bat_req->bat_base, bat_req->bat_bus_addr);
+}
+
+/**
+ * t7xx_dpmaif_bat_alloc() - Allocate the BAT ring buffer.
+ * @dpmaif_ctrl: Pointer to DPMAIF context structure.
+ * @bat_req: Pointer to BAT request structure.
+ * @buf_type: BAT ring type.
+ *
+ * This function allocates the BAT ring buffer shared with the HW device, also allocates
+ * a buffer used to store information about the BAT skbs for further release.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ERROR - Error code.
+ */
+int t7xx_dpmaif_bat_alloc(const struct dpmaif_ctrl *dpmaif_ctrl, struct dpmaif_bat_request *bat_req,
+ const enum bat_type buf_type)
+{
+ int sw_buf_size;
+
+ if (buf_type == BAT_TYPE_FRAG) {
+ sw_buf_size = sizeof(struct dpmaif_bat_page);
+ bat_req->bat_size_cnt = DPMAIF_FRG_COUNT;
+ bat_req->pkt_buf_sz = DPMAIF_HW_FRG_PKTBUF;
+ } else {
+ sw_buf_size = sizeof(struct dpmaif_bat_skb);
+ bat_req->bat_size_cnt = DPMAIF_BAT_COUNT;
+ bat_req->pkt_buf_sz = DPMAIF_HW_BAT_PKTBUF;
+ }
+
+ bat_req->type = buf_type;
+ bat_req->bat_wr_idx = 0;
+ bat_req->bat_release_rd_idx = 0;
+
+ bat_req->bat_base = dma_alloc_coherent(dpmaif_ctrl->dev,
+ bat_req->bat_size_cnt * sizeof(struct dpmaif_bat),
+ &bat_req->bat_bus_addr, GFP_KERNEL | __GFP_ZERO);
+ if (!bat_req->bat_base)
+ return -ENOMEM;
+
+ /* For AP SW to record skb information */
+ bat_req->bat_skb = devm_kzalloc(dpmaif_ctrl->dev, bat_req->bat_size_cnt * sw_buf_size,
+ GFP_KERNEL);
+ if (!bat_req->bat_skb)
+ goto err_free_dma_mem;
+
+ bat_req->bat_bitmap = bitmap_zalloc(bat_req->bat_size_cnt, GFP_KERNEL);
+ if (!bat_req->bat_bitmap)
+ goto err_free_dma_mem;
+
+ spin_lock_init(&bat_req->mask_lock);
+ atomic_set(&bat_req->refcnt, 0);
+ return 0;
+
+err_free_dma_mem:
+ t7xx_dpmaif_base_free(dpmaif_ctrl, bat_req);
+
+ return -ENOMEM;
+}
+
+void t7xx_dpmaif_bat_free(const struct dpmaif_ctrl *dpmaif_ctrl, struct dpmaif_bat_request *bat_req)
+{
+ if (!bat_req || !atomic_dec_and_test(&bat_req->refcnt))
+ return;
+
+ bitmap_free(bat_req->bat_bitmap);
+ bat_req->bat_bitmap = NULL;
+
+ if (bat_req->bat_skb) {
+ unsigned int i;
+
+ for (i = 0; i < bat_req->bat_size_cnt; i++) {
+ if (bat_req->type == BAT_TYPE_FRAG)
+ t7xx_unmap_bat_page(dpmaif_ctrl->dev, bat_req->bat_skb, i);
+ else
+ t7xx_unmap_bat_skb(dpmaif_ctrl->dev, bat_req->bat_skb, i);
+ }
+ }
+
+ t7xx_dpmaif_base_free(dpmaif_ctrl, bat_req);
+}
+
+static int t7xx_dpmaif_rx_alloc(struct dpmaif_rx_queue *rxq)
+{
+ rxq->pit_size_cnt = DPMAIF_PIT_COUNT;
+ rxq->pit_rd_idx = 0;
+ rxq->pit_wr_idx = 0;
+ rxq->pit_release_rd_idx = 0;
+ rxq->expect_pit_seq = 0;
+ rxq->pit_remain_release_cnt = 0;
+ memset(&rxq->rx_data_info, 0, sizeof(rxq->rx_data_info));
+
+ rxq->pit_base = dma_alloc_coherent(rxq->dpmaif_ctrl->dev,
+ rxq->pit_size_cnt * sizeof(struct dpmaif_pit),
+ &rxq->pit_bus_addr, GFP_KERNEL | __GFP_ZERO);
+ if (!rxq->pit_base)
+ return -ENOMEM;
+
+ rxq->bat_req = &rxq->dpmaif_ctrl->bat_req;
+ atomic_inc(&rxq->bat_req->refcnt);
+
+ rxq->bat_frag = &rxq->dpmaif_ctrl->bat_frag;
+ atomic_inc(&rxq->bat_frag->refcnt);
+ return 0;
+}
+
+static void t7xx_dpmaif_rx_buf_free(const struct dpmaif_rx_queue *rxq)
+{
+ if (!rxq->dpmaif_ctrl)
+ return;
+
+ t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_req);
+ t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_frag);
+
+ if (rxq->pit_base)
+ dma_free_coherent(rxq->dpmaif_ctrl->dev,
+ rxq->pit_size_cnt * sizeof(struct dpmaif_pit),
+ rxq->pit_base, rxq->pit_bus_addr);
+}
+
+int t7xx_dpmaif_rxq_init(struct dpmaif_rx_queue *queue)
+{
+ int ret;
+
+ ret = t7xx_dpmaif_rx_alloc(queue);
+ if (ret < 0) {
+ dev_err(queue->dpmaif_ctrl->dev, "Failed to allocate RX buffers: %d\n", ret);
+ return ret;
+ }
+
+ INIT_WORK(&queue->dpmaif_rxq_work, t7xx_dpmaif_rxq_work);
+
+ queue->worker = alloc_workqueue("dpmaif_rx%d_worker",
+ WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI, 1, queue->index);
+ if (!queue->worker) {
+ ret = -ENOMEM;
+ goto err_free_rx_buffer;
+ }
+
+ init_waitqueue_head(&queue->rx_wq);
+ skb_queue_head_init(&queue->skb_list);
+ queue->skb_list_max_len = queue->bat_req->pkt_buf_sz;
+ queue->rx_thread = kthread_run(t7xx_dpmaif_net_rx_push_thread,
+ queue, "dpmaif_rx%d_push", queue->index);
+
+ ret = PTR_ERR_OR_ZERO(queue->rx_thread);
+ if (ret)
+ goto err_free_workqueue;
+
+ return 0;
+
+err_free_workqueue:
+ destroy_workqueue(queue->worker);
+
+err_free_rx_buffer:
+ t7xx_dpmaif_rx_buf_free(queue);
+
+ return ret;
+}
+
+void t7xx_dpmaif_rxq_free(struct dpmaif_rx_queue *queue)
+{
+ if (queue->worker)
+ destroy_workqueue(queue->worker);
+
+ if (queue->rx_thread)
+ kthread_stop(queue->rx_thread);
+
+ skb_queue_purge(&queue->skb_list);
+ t7xx_dpmaif_rx_buf_free(queue);
+}
+
+static void t7xx_dpmaif_bat_release_work(struct work_struct *work)
+{
+ struct dpmaif_ctrl *dpmaif_ctrl = container_of(work, struct dpmaif_ctrl, bat_release_work);
+ struct dpmaif_rx_queue *rxq;
+
+ /* ALL RXQ use one BAT table, so choose DPF_RX_QNO_DFT */
+ rxq = &dpmaif_ctrl->rxq[DPF_RX_QNO_DFT];
+ t7xx_dpmaif_bat_release_and_add(rxq);
+ t7xx_dpmaif_frag_bat_release_and_add(rxq);
+}
+
+int t7xx_dpmaif_bat_rel_wq_alloc(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ dpmaif_ctrl->bat_release_wq = alloc_workqueue("dpmaif_bat_release_work_queue",
+ WQ_MEM_RECLAIM, 1);
+ if (!dpmaif_ctrl->bat_release_wq)
+ return -ENOMEM;
+
+ INIT_WORK(&dpmaif_ctrl->bat_release_work, t7xx_dpmaif_bat_release_work);
+ return 0;
+}
+
+void t7xx_dpmaif_bat_wq_rel(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ flush_work(&dpmaif_ctrl->bat_release_work);
+
+ if (dpmaif_ctrl->bat_release_wq) {
+ destroy_workqueue(dpmaif_ctrl->bat_release_wq);
+ dpmaif_ctrl->bat_release_wq = NULL;
+ }
+}
+
+/**
+ * t7xx_dpmaif_rx_stop() - Suspend RX flow.
+ * @dpmaif_ctrl: Pointer to data path control struct dpmaif_ctrl.
+ *
+ * Wait for all the RX work to finish executing and mark the RX queue as paused.
+ */
+void t7xx_dpmaif_rx_stop(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ unsigned int i;
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++) {
+ struct dpmaif_rx_queue *rxq = &dpmaif_ctrl->rxq[i];
+ int timeout, value;
+
+ flush_work(&rxq->dpmaif_rxq_work);
+
+ timeout = readx_poll_timeout_atomic(atomic_read, &rxq->rx_processing, value,
+ !value, 0, DPMAIF_CHECK_INIT_TIMEOUT_US);
+ if (timeout)
+ dev_err(dpmaif_ctrl->dev, "Stop RX SW failed\n");
+
+ /* Ensure RX processing has stopped before we set rxq->que_started to false */
+ smp_mb();
+ rxq->que_started = false;
+ }
+}
+
+static void t7xx_dpmaif_stop_rxq(struct dpmaif_rx_queue *rxq)
+{
+ int cnt, j = 0;
+
+ flush_work(&rxq->dpmaif_rxq_work);
+ rxq->que_started = false;
+
+ do {
+ cnt = t7xx_ring_buf_rd_wr_count(rxq->pit_size_cnt, rxq->pit_rd_idx,
+ rxq->pit_wr_idx, DPMAIF_READ);
+
+ if (++j >= DPMAIF_MAX_CHECK_COUNT) {
+ dev_err(rxq->dpmaif_ctrl->dev, "Stop RX SW failed, %d\n", cnt);
+ break;
+ }
+ } while (cnt);
+
+ memset(rxq->pit_base, 0, rxq->pit_size_cnt * sizeof(struct dpmaif_pit));
+ memset(rxq->bat_req->bat_base, 0, rxq->bat_req->bat_size_cnt * sizeof(struct dpmaif_bat));
+ bitmap_zero(rxq->bat_req->bat_bitmap, rxq->bat_req->bat_size_cnt);
+ memset(&rxq->rx_data_info, 0, sizeof(rxq->rx_data_info));
+
+ rxq->pit_rd_idx = 0;
+ rxq->pit_wr_idx = 0;
+ rxq->pit_release_rd_idx = 0;
+ rxq->expect_pit_seq = 0;
+ rxq->pit_remain_release_cnt = 0;
+ rxq->bat_req->bat_release_rd_idx = 0;
+ rxq->bat_req->bat_wr_idx = 0;
+ rxq->bat_frag->bat_release_rd_idx = 0;
+ rxq->bat_frag->bat_wr_idx = 0;
+}
+
+void t7xx_dpmaif_rx_clear(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ int i;
+
+ for (i = 0; i < DPMAIF_RXQ_NUM; i++)
+ t7xx_dpmaif_stop_rxq(&dpmaif_ctrl->rxq[i]);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.h b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.h
new file mode 100644
index 000000000000..182f62dfe398
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_rx.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_HIF_DPMA_RX_H__
+#define __T7XX_HIF_DPMA_RX_H__
+
+#include <linux/bits.h>
+#include <linux/types.h>
+
+#include "t7xx_hif_dpmaif.h"
+
+#define NETIF_MASK GENMASK(4, 0)
+
+#define PKT_TYPE_IP4 0
+#define PKT_TYPE_IP6 1
+
+/* Structure of DL PIT */
+struct dpmaif_pit {
+ __le32 header;
+ union {
+ struct {
+ __le32 data_addr_l;
+ __le32 data_addr_h;
+ __le32 footer;
+ } pd;
+ struct {
+ __le32 params_1;
+ __le32 params_2;
+ __le32 params_3;
+ } msg;
+ };
+};
+
+/* PIT header fields */
+#define PD_PIT_DATA_LEN GENMASK(31, 16)
+#define PD_PIT_BUFFER_ID GENMASK(15, 3)
+#define PD_PIT_BUFFER_TYPE BIT(2)
+#define PD_PIT_CONT BIT(1)
+#define PD_PIT_PACKET_TYPE BIT(0)
+/* PIT footer fields */
+#define PD_PIT_DLQ_DONE GENMASK(31, 30)
+#define PD_PIT_ULQ_DONE GENMASK(29, 24)
+#define PD_PIT_HEADER_OFFSET GENMASK(23, 19)
+#define PD_PIT_BI_F GENMASK(18, 17)
+#define PD_PIT_IG BIT(16)
+#define PD_PIT_RES GENMASK(15, 11)
+#define PD_PIT_H_BID GENMASK(10, 8)
+#define PD_PIT_PIT_SEQ GENMASK(7, 0)
+
+#define MSG_PIT_DP BIT(31)
+#define MSG_PIT_RES GENMASK(30, 27)
+#define MSG_PIT_NETWORK_TYPE GENMASK(26, 24)
+#define MSG_PIT_CHANNEL_ID GENMASK(23, 16)
+#define MSG_PIT_RES2 GENMASK(15, 12)
+#define MSG_PIT_HPC_IDX GENMASK(11, 8)
+#define MSG_PIT_SRC_QID GENMASK(7, 5)
+#define MSG_PIT_ERROR_BIT BIT(4)
+#define MSG_PIT_CHECKSUM GENMASK(3, 2)
+#define MSG_PIT_CONT BIT(1)
+#define MSG_PIT_PACKET_TYPE BIT(0)
+
+#define MSG_PIT_HP_IDX GENMASK(31, 27)
+#define MSG_PIT_CMD GENMASK(26, 24)
+#define MSG_PIT_RES3 GENMASK(23, 21)
+#define MSG_PIT_FLOW GENMASK(20, 16)
+#define MSG_PIT_COUNT GENMASK(15, 0)
+
+#define MSG_PIT_HASH GENMASK(31, 24)
+#define MSG_PIT_RES4 GENMASK(23, 18)
+#define MSG_PIT_PRO GENMASK(17, 16)
+#define MSG_PIT_VBID GENMASK(15, 3)
+#define MSG_PIT_RES5 GENMASK(2, 0)
+
+#define MSG_PIT_DLQ_DONE GENMASK(31, 30)
+#define MSG_PIT_ULQ_DONE GENMASK(29, 24)
+#define MSG_PIT_IP BIT(23)
+#define MSG_PIT_RES6 BIT(22)
+#define MSG_PIT_MR GENMASK(21, 20)
+#define MSG_PIT_RES7 GENMASK(19, 17)
+#define MSG_PIT_IG BIT(16)
+#define MSG_PIT_RES8 GENMASK(15, 11)
+#define MSG_PIT_H_BID GENMASK(10, 8)
+#define MSG_PIT_PIT_SEQ GENMASK(7, 0)
+
+int t7xx_dpmaif_rxq_init(struct dpmaif_rx_queue *queue);
+void t7xx_dpmaif_rx_clear(struct dpmaif_ctrl *dpmaif_ctrl);
+int t7xx_dpmaif_bat_rel_wq_alloc(struct dpmaif_ctrl *dpmaif_ctrl);
+int t7xx_dpmaif_rx_buf_alloc(struct dpmaif_ctrl *dpmaif_ctrl,
+ const struct dpmaif_bat_request *bat_req,
+ const unsigned int q_num, const unsigned int buf_cnt,
+ const bool initial);
+int t7xx_dpmaif_rx_frag_alloc(struct dpmaif_ctrl *dpmaif_ctrl, struct dpmaif_bat_request *bat_req,
+ const unsigned int buf_cnt, const bool first_time);
+void t7xx_dpmaif_rx_stop(struct dpmaif_ctrl *dpmaif_ctrl);
+void t7xx_dpmaif_irq_rx_done(struct dpmaif_ctrl *dpmaif_ctrl, const unsigned int que_mask);
+void t7xx_dpmaif_rxq_free(struct dpmaif_rx_queue *queue);
+void t7xx_dpmaif_bat_wq_rel(struct dpmaif_ctrl *dpmaif_ctrl);
+int t7xx_dpmaif_bat_alloc(const struct dpmaif_ctrl *dpmaif_ctrl, struct dpmaif_bat_request *bat_req,
+ const enum bat_type buf_type);
+void t7xx_dpmaif_bat_free(const struct dpmaif_ctrl *dpmaif_ctrl,
+ struct dpmaif_bat_request *bat_req);
+
+#endif /* __T7XX_HIF_DPMA_RX_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c
new file mode 100644
index 000000000000..e8435a871842
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c
@@ -0,0 +1,651 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Amir Hanania <[email protected]>
+ * Haijun Liu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Chiranjeevi Rapolu <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-direction.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/minmax.h>
+#include <linux/netdevice.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_dpmaif.h"
+#include "t7xx_hif_dpmaif.h"
+#include "t7xx_hif_dpmaif_tx.h"
+#include "t7xx_pci.h"
+
+#define DPMAIF_SKB_TX_BURST_CNT 5
+#define DPMAIF_DRB_LIST_LEN 6144
+
+/* DRB dtype */
+#define DES_DTYP_PD 0
+#define DES_DTYP_MSG 1
+
+static unsigned int t7xx_dpmaif_update_drb_rd_idx(struct dpmaif_ctrl *dpmaif_ctrl,
+ unsigned int q_num)
+{
+ struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num];
+ unsigned int old_sw_rd_idx, new_hw_rd_idx, drb_cnt;
+ unsigned long flags;
+
+ if (!txq->que_started)
+ return 0;
+
+ old_sw_rd_idx = txq->drb_rd_idx;
+ new_hw_rd_idx = t7xx_dpmaif_ul_get_rd_idx(&dpmaif_ctrl->hw_info, q_num);
+ if (new_hw_rd_idx >= DPMAIF_DRB_LIST_LEN) {
+ dev_err(dpmaif_ctrl->dev, "Out of range read index: %u\n", new_hw_rd_idx);
+ return 0;
+ }
+
+ if (old_sw_rd_idx <= new_hw_rd_idx)
+ drb_cnt = new_hw_rd_idx - old_sw_rd_idx;
+ else
+ drb_cnt = txq->drb_size_cnt - old_sw_rd_idx + new_hw_rd_idx;
+
+ spin_lock_irqsave(&txq->tx_lock, flags);
+ txq->drb_rd_idx = new_hw_rd_idx;
+ spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+ return drb_cnt;
+}
+
+static unsigned int t7xx_dpmaif_release_tx_buffer(struct dpmaif_ctrl *dpmaif_ctrl,
+ unsigned int q_num, unsigned int release_cnt)
+{
+ struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num];
+ struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks;
+ struct dpmaif_drb_skb *cur_drb_skb, *drb_skb_base;
+ struct dpmaif_drb *cur_drb, *drb_base;
+ unsigned int drb_cnt, i, cur_idx;
+ unsigned long flags;
+
+ drb_skb_base = txq->drb_skb_base;
+ drb_base = txq->drb_base;
+
+ spin_lock_irqsave(&txq->tx_lock, flags);
+ drb_cnt = txq->drb_size_cnt;
+ cur_idx = txq->drb_release_rd_idx;
+ spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+ for (i = 0; i < release_cnt; i++) {
+ cur_drb = drb_base + cur_idx;
+ if (FIELD_GET(DRB_HDR_DTYP, le32_to_cpu(cur_drb->header)) == DES_DTYP_PD) {
+ cur_drb_skb = drb_skb_base + cur_idx;
+ if (!cur_drb_skb->is_msg)
+ dma_unmap_single(dpmaif_ctrl->dev, cur_drb_skb->bus_addr,
+ cur_drb_skb->data_len, DMA_TO_DEVICE);
+
+ if (!FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header))) {
+ if (!cur_drb_skb->skb) {
+ dev_err(dpmaif_ctrl->dev,
+ "txq%u: DRB check fail, invalid skb\n", q_num);
+ continue;
+ }
+
+ dev_kfree_skb_any(cur_drb_skb->skb);
+ }
+
+ cur_drb_skb->skb = NULL;
+ }
+
+ spin_lock_irqsave(&txq->tx_lock, flags);
+ cur_idx = t7xx_ring_buf_get_next_wr_idx(drb_cnt, cur_idx);
+ txq->drb_release_rd_idx = cur_idx;
+ spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+ if (atomic_inc_return(&txq->tx_budget) > txq->drb_size_cnt / 8)
+ cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_IRQ, txq->index);
+ }
+
+ if (FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header)))
+ dev_err(dpmaif_ctrl->dev, "txq%u: DRB not marked as the last one\n", q_num);
+
+ return i;
+}
+
+static int t7xx_dpmaif_tx_release(struct dpmaif_ctrl *dpmaif_ctrl,
+ unsigned int q_num, unsigned int budget)
+{
+ struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num];
+ unsigned int rel_cnt, real_rel_cnt;
+
+ /* Update read index from HW */
+ t7xx_dpmaif_update_drb_rd_idx(dpmaif_ctrl, q_num);
+
+ rel_cnt = t7xx_ring_buf_rd_wr_count(txq->drb_size_cnt, txq->drb_release_rd_idx,
+ txq->drb_rd_idx, DPMAIF_READ);
+
+ real_rel_cnt = min_not_zero(budget, rel_cnt);
+ if (real_rel_cnt)
+ real_rel_cnt = t7xx_dpmaif_release_tx_buffer(dpmaif_ctrl, q_num, real_rel_cnt);
+
+ return real_rel_cnt < rel_cnt ? -EAGAIN : 0;
+}
+
+static bool t7xx_dpmaif_drb_ring_not_empty(struct dpmaif_tx_queue *txq)
+{
+ return !!t7xx_dpmaif_update_drb_rd_idx(txq->dpmaif_ctrl, txq->index);
+}
+
+static void t7xx_dpmaif_tx_done(struct work_struct *work)
+{
+ struct dpmaif_tx_queue *txq = container_of(work, struct dpmaif_tx_queue, dpmaif_tx_work);
+ struct dpmaif_ctrl *dpmaif_ctrl = txq->dpmaif_ctrl;
+ struct dpmaif_hw_info *hw_info;
+ int ret;
+
+ hw_info = &dpmaif_ctrl->hw_info;
+ ret = t7xx_dpmaif_tx_release(dpmaif_ctrl, txq->index, txq->drb_size_cnt);
+ if (ret == -EAGAIN ||
+ (t7xx_dpmaif_ul_clr_done(hw_info, txq->index) &&
+ t7xx_dpmaif_drb_ring_not_empty(txq))) {
+ queue_work(dpmaif_ctrl->txq[txq->index].worker,
+ &dpmaif_ctrl->txq[txq->index].dpmaif_tx_work);
+ /* Give the device time to enter the low power state */
+ t7xx_dpmaif_clr_ip_busy_sts(hw_info);
+ } else {
+ t7xx_dpmaif_clr_ip_busy_sts(hw_info);
+ t7xx_dpmaif_unmask_ulq_intr(hw_info, txq->index);
+ }
+}
+
+static void t7xx_setup_msg_drb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num,
+ unsigned int cur_idx, unsigned int pkt_len, unsigned int count_l,
+ unsigned int channel_id)
+{
+ struct dpmaif_drb *drb_base = dpmaif_ctrl->txq[q_num].drb_base;
+ struct dpmaif_drb *drb = drb_base + cur_idx;
+
+ drb->header = cpu_to_le32(FIELD_PREP(DRB_HDR_DTYP, DES_DTYP_MSG) |
+ FIELD_PREP(DRB_HDR_CONT, 1) |
+ FIELD_PREP(DRB_HDR_DATA_LEN, pkt_len));
+
+ drb->msg.msg_hdr = cpu_to_le32(FIELD_PREP(DRB_MSG_COUNT_L, count_l) |
+ FIELD_PREP(DRB_MSG_CHANNEL_ID, channel_id) |
+ FIELD_PREP(DRB_MSG_L4_CHK, 1));
+}
+
+static void t7xx_setup_payload_drb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num,
+ unsigned int cur_idx, dma_addr_t data_addr,
+ unsigned int pkt_size, bool last_one)
+{
+ struct dpmaif_drb *drb_base = dpmaif_ctrl->txq[q_num].drb_base;
+ struct dpmaif_drb *drb = drb_base + cur_idx;
+ u32 header;
+
+ header = FIELD_PREP(DRB_HDR_DTYP, DES_DTYP_PD) | FIELD_PREP(DRB_HDR_DATA_LEN, pkt_size);
+ if (!last_one)
+ header |= FIELD_PREP(DRB_HDR_CONT, 1);
+
+ drb->header = cpu_to_le32(header);
+ drb->pd.data_addr_l = cpu_to_le32(lower_32_bits(data_addr));
+ drb->pd.data_addr_h = cpu_to_le32(upper_32_bits(data_addr));
+}
+
+static void t7xx_record_drb_skb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num,
+ unsigned int cur_idx, struct sk_buff *skb, bool is_msg,
+ bool is_frag, bool is_last_one, dma_addr_t bus_addr,
+ unsigned int data_len)
+{
+ struct dpmaif_drb_skb *drb_skb_base = dpmaif_ctrl->txq[q_num].drb_skb_base;
+ struct dpmaif_drb_skb *drb_skb = drb_skb_base + cur_idx;
+
+ drb_skb->skb = skb;
+ drb_skb->bus_addr = bus_addr;
+ drb_skb->data_len = data_len;
+ drb_skb->index = cur_idx;
+ drb_skb->is_msg = is_msg;
+ drb_skb->is_frag = is_frag;
+ drb_skb->is_last = is_last_one;
+}
+
+static int t7xx_dpmaif_add_skb_to_ring(struct dpmaif_ctrl *dpmaif_ctrl, struct sk_buff *skb)
+{
+ struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks;
+ unsigned int wr_cnt, send_cnt, payload_cnt;
+ unsigned int cur_idx, drb_wr_idx_backup;
+ struct skb_shared_info *shinfo;
+ struct dpmaif_tx_queue *txq;
+ struct t7xx_skb_cb *skb_cb;
+ unsigned long flags;
+
+ skb_cb = T7XX_SKB_CB(skb);
+ txq = &dpmaif_ctrl->txq[skb_cb->txq_number];
+ if (!txq->que_started || dpmaif_ctrl->state != DPMAIF_STATE_PWRON)
+ return -ENODEV;
+
+ atomic_set(&txq->tx_processing, 1);
+ /* Ensure tx_processing is changed to 1 before actually begin TX flow */
+ smp_mb();
+
+ shinfo = skb_shinfo(skb);
+ if (shinfo->frag_list)
+ dev_warn_ratelimited(dpmaif_ctrl->dev, "frag_list not supported\n");
+
+ payload_cnt = shinfo->nr_frags + 1;
+ /* nr_frags: frag cnt, 1: skb->data, 1: msg DRB */
+ send_cnt = payload_cnt + 1;
+
+ spin_lock_irqsave(&txq->tx_lock, flags);
+ cur_idx = txq->drb_wr_idx;
+ drb_wr_idx_backup = cur_idx;
+ txq->drb_wr_idx += send_cnt;
+ if (txq->drb_wr_idx >= txq->drb_size_cnt)
+ txq->drb_wr_idx -= txq->drb_size_cnt;
+ t7xx_setup_msg_drb(dpmaif_ctrl, txq->index, cur_idx, skb->len, 0, skb_cb->netif_idx);
+ t7xx_record_drb_skb(dpmaif_ctrl, txq->index, cur_idx, skb, true, 0, 0, 0, 0);
+ spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+ for (wr_cnt = 0; wr_cnt < payload_cnt; wr_cnt++) {
+ bool is_frag, is_last_one = wr_cnt == payload_cnt - 1;
+ unsigned int data_len;
+ dma_addr_t bus_addr;
+ void *data_addr;
+
+ if (!wr_cnt) {
+ data_len = skb_headlen(skb);
+ data_addr = skb->data;
+ is_frag = false;
+ } else {
+ skb_frag_t *frag = shinfo->frags + wr_cnt - 1;
+
+ data_len = skb_frag_size(frag);
+ data_addr = skb_frag_address(frag);
+ is_frag = true;
+ }
+
+ bus_addr = dma_map_single(dpmaif_ctrl->dev, data_addr, data_len, DMA_TO_DEVICE);
+ if (dma_mapping_error(dpmaif_ctrl->dev, bus_addr))
+ goto unmap_buffers;
+
+ cur_idx = t7xx_ring_buf_get_next_wr_idx(txq->drb_size_cnt, cur_idx);
+
+ spin_lock_irqsave(&txq->tx_lock, flags);
+ t7xx_setup_payload_drb(dpmaif_ctrl, txq->index, cur_idx, bus_addr, data_len,
+ is_last_one);
+ t7xx_record_drb_skb(dpmaif_ctrl, txq->index, cur_idx, skb, false, is_frag,
+ is_last_one, bus_addr, data_len);
+ spin_unlock_irqrestore(&txq->tx_lock, flags);
+ }
+
+ if (atomic_sub_return(send_cnt, &txq->tx_budget) <= (MAX_SKB_FRAGS + 2))
+ cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_FULL, txq->index);
+
+ atomic_set(&txq->tx_processing, 0);
+
+ return 0;
+
+unmap_buffers:
+ while (wr_cnt--) {
+ struct dpmaif_drb_skb *drb_skb = txq->drb_skb_base;
+
+ cur_idx = cur_idx ? cur_idx - 1 : txq->drb_size_cnt - 1;
+ drb_skb += cur_idx;
+ dma_unmap_single(dpmaif_ctrl->dev, drb_skb->bus_addr,
+ drb_skb->data_len, DMA_TO_DEVICE);
+ }
+
+ txq->drb_wr_idx = drb_wr_idx_backup;
+ atomic_set(&txq->tx_processing, 0);
+
+ return -ENOMEM;
+}
+
+static bool t7xx_tx_lists_are_all_empty(const struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ int i;
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+ if (!skb_queue_empty(&dpmaif_ctrl->txq[i].tx_skb_head))
+ return false;
+ }
+
+ return true;
+}
+
+/* Currently, only the default TX queue is used */
+static struct dpmaif_tx_queue *t7xx_select_tx_queue(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ struct dpmaif_tx_queue *txq;
+
+ txq = &dpmaif_ctrl->txq[DPMAIF_TX_DEFAULT_QUEUE];
+ if (!txq->que_started)
+ return NULL;
+
+ return txq;
+}
+
+static unsigned int t7xx_txq_drb_wr_available(struct dpmaif_tx_queue *txq)
+{
+ return t7xx_ring_buf_rd_wr_count(txq->drb_size_cnt, txq->drb_release_rd_idx,
+ txq->drb_wr_idx, DPMAIF_WRITE);
+}
+
+static unsigned int t7xx_skb_drb_cnt(struct sk_buff *skb)
+{
+ /* Normal DRB (frags data + skb linear data) + msg DRB */
+ return skb_shinfo(skb)->nr_frags + 2;
+}
+
+static int t7xx_txq_burst_send_skb(struct dpmaif_tx_queue *txq)
+{
+ unsigned int drb_remain_cnt, i;
+ unsigned int send_drb_cnt;
+ int drb_cnt = 0;
+ int ret = 0;
+
+ drb_remain_cnt = t7xx_txq_drb_wr_available(txq);
+
+ for (i = 0; i < DPMAIF_SKB_TX_BURST_CNT; i++) {
+ struct sk_buff *skb;
+
+ skb = skb_peek(&txq->tx_skb_head);
+ if (!skb)
+ break;
+
+ send_drb_cnt = t7xx_skb_drb_cnt(skb);
+ if (drb_remain_cnt < send_drb_cnt) {
+ drb_remain_cnt = t7xx_txq_drb_wr_available(txq);
+ continue;
+ }
+
+ drb_remain_cnt -= send_drb_cnt;
+
+ ret = t7xx_dpmaif_add_skb_to_ring(txq->dpmaif_ctrl, skb);
+ if (ret < 0) {
+ dev_err(txq->dpmaif_ctrl->dev,
+ "Failed to add skb to device's ring: %d\n", ret);
+ break;
+ }
+
+ drb_cnt += send_drb_cnt;
+ skb_unlink(skb, &txq->tx_skb_head);
+ }
+
+ if (drb_cnt > 0)
+ return drb_cnt;
+
+ return ret;
+}
+
+static void t7xx_do_tx_hw_push(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ do {
+ struct dpmaif_tx_queue *txq;
+ int drb_send_cnt;
+
+ txq = t7xx_select_tx_queue(dpmaif_ctrl);
+ if (!txq)
+ return;
+
+ drb_send_cnt = t7xx_txq_burst_send_skb(txq);
+ if (drb_send_cnt <= 0) {
+ usleep_range(10, 20);
+ cond_resched();
+ continue;
+ }
+
+ t7xx_dpmaif_ul_update_hw_drb_cnt(&dpmaif_ctrl->hw_info, txq->index,
+ drb_send_cnt * DPMAIF_UL_DRB_SIZE_WORD);
+
+ cond_resched();
+ } while (!t7xx_tx_lists_are_all_empty(dpmaif_ctrl) && !kthread_should_stop() &&
+ (dpmaif_ctrl->state == DPMAIF_STATE_PWRON));
+}
+
+static int t7xx_dpmaif_tx_hw_push_thread(void *arg)
+{
+ struct dpmaif_ctrl *dpmaif_ctrl = arg;
+
+ while (!kthread_should_stop()) {
+ if (t7xx_tx_lists_are_all_empty(dpmaif_ctrl) ||
+ dpmaif_ctrl->state != DPMAIF_STATE_PWRON) {
+ if (wait_event_interruptible(dpmaif_ctrl->tx_wq,
+ (!t7xx_tx_lists_are_all_empty(dpmaif_ctrl) &&
+ dpmaif_ctrl->state == DPMAIF_STATE_PWRON) ||
+ kthread_should_stop()))
+ continue;
+
+ if (kthread_should_stop())
+ break;
+ }
+
+ t7xx_do_tx_hw_push(dpmaif_ctrl);
+ }
+
+ return 0;
+}
+
+int t7xx_dpmaif_tx_thread_init(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ init_waitqueue_head(&dpmaif_ctrl->tx_wq);
+ dpmaif_ctrl->tx_thread = kthread_run(t7xx_dpmaif_tx_hw_push_thread,
+ dpmaif_ctrl, "dpmaif_tx_hw_push");
+ return PTR_ERR_OR_ZERO(dpmaif_ctrl->tx_thread);
+}
+
+void t7xx_dpmaif_tx_thread_rel(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ if (dpmaif_ctrl->tx_thread)
+ kthread_stop(dpmaif_ctrl->tx_thread);
+}
+
+/**
+ * t7xx_dpmaif_tx_send_skb() - Add skb to the transmit queue.
+ * @dpmaif_ctrl: Pointer to struct dpmaif_ctrl.
+ * @txq_number: Queue number to xmit on.
+ * @skb: Pointer to the skb to transmit.
+ *
+ * Add the skb to the queue of the skbs to be transmit.
+ * Wake up the thread that push the skbs from the queue to the HW.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -EBUSY - Tx budget exhausted.
+ * In normal circumstances t7xx_dpmaif_add_skb_to_ring() must report the txq full
+ * state to prevent this error condition.
+ */
+int t7xx_dpmaif_tx_send_skb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int txq_number,
+ struct sk_buff *skb)
+{
+ struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[txq_number];
+ struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks;
+ struct t7xx_skb_cb *skb_cb;
+
+ if (atomic_read(&txq->tx_budget) <= t7xx_skb_drb_cnt(skb)) {
+ cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_FULL, txq_number);
+ return -EBUSY;
+ }
+
+ skb_cb = T7XX_SKB_CB(skb);
+ skb_cb->txq_number = txq_number;
+ skb_queue_tail(&txq->tx_skb_head, skb);
+ wake_up(&dpmaif_ctrl->tx_wq);
+
+ return 0;
+}
+
+void t7xx_dpmaif_irq_tx_done(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int que_mask)
+{
+ int i;
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+ if (que_mask & BIT(i))
+ queue_work(dpmaif_ctrl->txq[i].worker, &dpmaif_ctrl->txq[i].dpmaif_tx_work);
+ }
+}
+
+static int t7xx_dpmaif_tx_drb_buf_init(struct dpmaif_tx_queue *txq)
+{
+ size_t brb_skb_size, brb_pd_size;
+
+ brb_pd_size = DPMAIF_DRB_LIST_LEN * sizeof(struct dpmaif_drb);
+ brb_skb_size = DPMAIF_DRB_LIST_LEN * sizeof(struct dpmaif_drb_skb);
+
+ txq->drb_size_cnt = DPMAIF_DRB_LIST_LEN;
+
+ /* For HW && AP SW */
+ txq->drb_base = dma_alloc_coherent(txq->dpmaif_ctrl->dev, brb_pd_size,
+ &txq->drb_bus_addr, GFP_KERNEL | __GFP_ZERO);
+ if (!txq->drb_base)
+ return -ENOMEM;
+
+ /* For AP SW to record the skb information */
+ txq->drb_skb_base = devm_kzalloc(txq->dpmaif_ctrl->dev, brb_skb_size, GFP_KERNEL);
+ if (!txq->drb_skb_base) {
+ dma_free_coherent(txq->dpmaif_ctrl->dev, brb_pd_size,
+ txq->drb_base, txq->drb_bus_addr);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void t7xx_dpmaif_tx_free_drb_skb(struct dpmaif_tx_queue *txq)
+{
+ struct dpmaif_drb_skb *drb_skb, *drb_skb_base = txq->drb_skb_base;
+ unsigned int i;
+
+ if (!drb_skb_base)
+ return;
+
+ for (i = 0; i < txq->drb_size_cnt; i++) {
+ drb_skb = drb_skb_base + i;
+ if (!drb_skb->skb)
+ continue;
+
+ if (!drb_skb->is_msg)
+ dma_unmap_single(txq->dpmaif_ctrl->dev, drb_skb->bus_addr,
+ drb_skb->data_len, DMA_TO_DEVICE);
+
+ if (drb_skb->is_last) {
+ dev_kfree_skb(drb_skb->skb);
+ drb_skb->skb = NULL;
+ }
+ }
+}
+
+static void t7xx_dpmaif_tx_drb_buf_rel(struct dpmaif_tx_queue *txq)
+{
+ if (txq->drb_base)
+ dma_free_coherent(txq->dpmaif_ctrl->dev,
+ txq->drb_size_cnt * sizeof(struct dpmaif_drb),
+ txq->drb_base, txq->drb_bus_addr);
+
+ t7xx_dpmaif_tx_free_drb_skb(txq);
+}
+
+/**
+ * t7xx_dpmaif_txq_init() - Initialize TX queue.
+ * @txq: Pointer to struct dpmaif_tx_queue.
+ *
+ * Initialize the TX queue data structure and allocate memory for it to use.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ERROR - Error code from failure sub-initializations.
+ */
+int t7xx_dpmaif_txq_init(struct dpmaif_tx_queue *txq)
+{
+ int ret;
+
+ skb_queue_head_init(&txq->tx_skb_head);
+ init_waitqueue_head(&txq->req_wq);
+ atomic_set(&txq->tx_budget, DPMAIF_DRB_LIST_LEN);
+
+ ret = t7xx_dpmaif_tx_drb_buf_init(txq);
+ if (ret) {
+ dev_err(txq->dpmaif_ctrl->dev, "Failed to initialize DRB buffers: %d\n", ret);
+ return ret;
+ }
+
+ txq->worker = alloc_workqueue("md_dpmaif_tx%d_worker", WQ_UNBOUND | WQ_MEM_RECLAIM |
+ (txq->index ? 0 : WQ_HIGHPRI), 1, txq->index);
+ if (!txq->worker)
+ return -ENOMEM;
+
+ INIT_WORK(&txq->dpmaif_tx_work, t7xx_dpmaif_tx_done);
+ spin_lock_init(&txq->tx_lock);
+
+ return 0;
+}
+
+void t7xx_dpmaif_txq_free(struct dpmaif_tx_queue *txq)
+{
+ if (txq->worker)
+ destroy_workqueue(txq->worker);
+
+ skb_queue_purge(&txq->tx_skb_head);
+ t7xx_dpmaif_tx_drb_buf_rel(txq);
+}
+
+void t7xx_dpmaif_tx_stop(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ int i;
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+ struct dpmaif_tx_queue *txq;
+ int count = 0;
+
+ txq = &dpmaif_ctrl->txq[i];
+ txq->que_started = false;
+ /* Make sure TXQ is disabled */
+ smp_mb();
+
+ /* Wait for active Tx to be done */
+ while (atomic_read(&txq->tx_processing)) {
+ if (++count >= DPMAIF_MAX_CHECK_COUNT) {
+ dev_err(dpmaif_ctrl->dev, "TX queue stop failed\n");
+ break;
+ }
+ }
+ }
+}
+
+static void t7xx_dpmaif_txq_flush_rel(struct dpmaif_tx_queue *txq)
+{
+ txq->que_started = false;
+
+ cancel_work_sync(&txq->dpmaif_tx_work);
+ flush_work(&txq->dpmaif_tx_work);
+ t7xx_dpmaif_tx_free_drb_skb(txq);
+
+ txq->drb_rd_idx = 0;
+ txq->drb_wr_idx = 0;
+ txq->drb_release_rd_idx = 0;
+}
+
+void t7xx_dpmaif_tx_clear(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+ int i;
+
+ for (i = 0; i < DPMAIF_TXQ_NUM; i++)
+ t7xx_dpmaif_txq_flush_rel(&dpmaif_ctrl->txq[i]);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.h b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.h
new file mode 100644
index 000000000000..ca9b9ea2da8b
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_HIF_DPMA_TX_H__
+#define __T7XX_HIF_DPMA_TX_H__
+
+#include <linux/bits.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+
+#include "t7xx_hif_dpmaif.h"
+
+#define DPMAIF_TX_DEFAULT_QUEUE 0
+
+struct dpmaif_drb {
+ __le32 header;
+ union {
+ struct {
+ __le32 data_addr_l;
+ __le32 data_addr_h;
+ } pd;
+ struct {
+ __le32 msg_hdr;
+ __le32 reserved1;
+ } msg;
+ };
+ __le32 reserved2;
+};
+
+/* Header fields */
+#define DRB_HDR_DATA_LEN GENMASK(31, 16)
+#define DRB_HDR_RESERVED GENMASK(15, 3)
+#define DRB_HDR_CONT BIT(2)
+#define DRB_HDR_DTYP GENMASK(1, 0)
+
+#define DRB_MSG_DW2_RES GENMASK(31, 30)
+#define DRB_MSG_L4_CHK BIT(29)
+#define DRB_MSG_IP_CHK BIT(28)
+#define DRB_MSG_RESERVED BIT(27)
+#define DRB_MSG_NETWORK_TYPE GENMASK(26, 24)
+#define DRB_MSG_CHANNEL_ID GENMASK(23, 16)
+#define DRB_MSG_COUNT_L GENMASK(15, 0)
+
+struct dpmaif_drb_skb {
+ struct sk_buff *skb;
+ dma_addr_t bus_addr;
+ unsigned int data_len;
+ u16 index:13;
+ u16 is_msg:1;
+ u16 is_frag:1;
+ u16 is_last:1;
+};
+
+int t7xx_dpmaif_tx_send_skb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int txq_number,
+ struct sk_buff *skb);
+void t7xx_dpmaif_tx_thread_rel(struct dpmaif_ctrl *dpmaif_ctrl);
+int t7xx_dpmaif_tx_thread_init(struct dpmaif_ctrl *dpmaif_ctrl);
+void t7xx_dpmaif_txq_free(struct dpmaif_tx_queue *txq);
+void t7xx_dpmaif_irq_tx_done(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int que_mask);
+int t7xx_dpmaif_txq_init(struct dpmaif_tx_queue *txq);
+void t7xx_dpmaif_tx_stop(struct dpmaif_ctrl *dpmaif_ctrl);
+void t7xx_dpmaif_tx_clear(struct dpmaif_ctrl *dpmaif_ctrl);
+
+#endif /* __T7XX_HIF_DPMA_TX_H__ */
--
2.25.1