From: Haijun Liu <[email protected]>
Cross Layer DMA (CLDMA) Hardware interface (HIF) enables the control
path of Host-Modem data transfers. CLDMA HIF layer provides a common
interface to the Port Layer.
CLDMA manages 8 independent RX/TX physical channels with data flow
control in HW queues. CLDMA uses ring buffers of General Packet
Descriptors (GPD) for TX/RX. GPDs can represent multiple or single
data buffers (DB).
CLDMA HIF initializes GPD rings, registers ISR handlers for CLDMA
interrupts, and initializes CLDMA HW registers.
CLDMA TX flow:
1. Port Layer write
2. Get DB address
3. Configure GPD
4. Triggering processing via HW register write
CLDMA RX flow:
1. CLDMA HW sends a RX "done" to host
2. Driver starts thread to safely read GPD
3. DB is sent to Port layer
4. Create a new buffer for GPD ring
Note: This patch does not enable compilation since it has dependencies
such as t7xx_pcie_mac_clear_int()/t7xx_pcie_mac_set_int() and
struct t7xx_pci_dev which are added by the core patch.
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]>
---
drivers/net/wwan/t7xx/t7xx_cldma.c | 281 ++++++
drivers/net/wwan/t7xx/t7xx_cldma.h | 180 ++++
drivers/net/wwan/t7xx/t7xx_hif_cldma.c | 1192 ++++++++++++++++++++++++
drivers/net/wwan/t7xx/t7xx_hif_cldma.h | 126 +++
drivers/net/wwan/t7xx/t7xx_reg.h | 33 +
5 files changed, 1812 insertions(+)
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_hif_cldma.c
create mode 100644 drivers/net/wwan/t7xx/t7xx_hif_cldma.h
create mode 100644 drivers/net/wwan/t7xx/t7xx_reg.h
diff --git a/drivers/net/wwan/t7xx/t7xx_cldma.c b/drivers/net/wwan/t7xx/t7xx_cldma.c
new file mode 100644
index 000000000000..9f43f256db1d
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_cldma.c
@@ -0,0 +1,281 @@
+// 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]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Andy Shevchenko <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/types.h>
+
+#include "t7xx_cldma.h"
+
+#define ADDR_SIZE 8
+
+void t7xx_cldma_clear_ip_busy(struct t7xx_cldma_hw *hw_info)
+{
+ u32 val;
+
+ val = ioread32(hw_info->ap_pdn_base + REG_CLDMA_IP_BUSY);
+ val |= IP_BUSY_WAKEUP;
+ iowrite32(val, hw_info->ap_pdn_base + REG_CLDMA_IP_BUSY);
+}
+
+/**
+ * t7xx_cldma_hw_restore() - Restore CLDMA HW registers.
+ * @hw_info: Pointer to struct t7xx_cldma_hw.
+ *
+ * Restore HW after resume. Writes uplink configuration for CLDMA HW.
+ */
+void t7xx_cldma_hw_restore(struct t7xx_cldma_hw *hw_info)
+{
+ u32 ul_cfg;
+
+ ul_cfg = ioread32(hw_info->ap_pdn_base + REG_CLDMA_UL_CFG);
+ ul_cfg &= ~UL_CFG_BIT_MODE_MASK;
+
+ if (hw_info->hw_mode == MODE_BIT_64)
+ ul_cfg |= UL_CFG_BIT_MODE_64;
+ else if (hw_info->hw_mode == MODE_BIT_40)
+ ul_cfg |= UL_CFG_BIT_MODE_40;
+ else if (hw_info->hw_mode == MODE_BIT_36)
+ ul_cfg |= UL_CFG_BIT_MODE_36;
+
+ iowrite32(ul_cfg, hw_info->ap_pdn_base + REG_CLDMA_UL_CFG);
+ /* Disable TX and RX invalid address check */
+ iowrite32(UL_MEM_CHECK_DIS, hw_info->ap_pdn_base + REG_CLDMA_UL_MEM);
+ iowrite32(DL_MEM_CHECK_DIS, hw_info->ap_pdn_base + REG_CLDMA_DL_MEM);
+}
+
+void t7xx_cldma_hw_start_queue(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+ u32 val;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_pdn_base + REG_CLDMA_DL_START_CMD :
+ hw_info->ap_pdn_base + REG_CLDMA_UL_START_CMD;
+ val = qno == CLDMA_ALL_Q ? CLDMA_ALL_Q : BIT(qno);
+ iowrite32(val, reg);
+}
+
+void t7xx_cldma_hw_start(struct t7xx_cldma_hw *hw_info)
+{
+ /* Enable the TX & RX interrupts */
+ iowrite32(TXRX_STATUS_BITMASK, hw_info->ap_pdn_base + REG_CLDMA_L2TIMCR0);
+ iowrite32(TXRX_STATUS_BITMASK, hw_info->ap_ao_base + REG_CLDMA_L2RIMCR0);
+ /* Enable the empty queue interrupt */
+ iowrite32(EMPTY_STATUS_BITMASK, hw_info->ap_pdn_base + REG_CLDMA_L2TIMCR0);
+ iowrite32(EMPTY_STATUS_BITMASK, hw_info->ap_ao_base + REG_CLDMA_L2RIMCR0);
+}
+
+void t7xx_cldma_hw_reset(void __iomem *ao_base)
+{
+ u32 val;
+
+ val = ioread32(ao_base + REG_INFRA_RST2_SET);
+ val |= RST2_PMIC_SW_RST_SET;
+ iowrite32(val, ao_base + REG_INFRA_RST2_SET);
+ val = ioread32(ao_base + REG_INFRA_RST4_SET);
+ val |= RST4_CLDMA1_SW_RST_SET;
+ iowrite32(val, ao_base + REG_INFRA_RST4_SET);
+ udelay(1);
+
+ val = ioread32(ao_base + REG_INFRA_RST4_CLR);
+ val |= RST4_CLDMA1_SW_RST_CLR;
+ iowrite32(val, ao_base + REG_INFRA_RST4_CLR);
+ val = ioread32(ao_base + REG_INFRA_RST2_CLR);
+ val |= RST2_PMIC_SW_RST_CLR;
+ iowrite32(val, ao_base + REG_INFRA_RST2_CLR);
+}
+
+bool t7xx_cldma_tx_addr_is_set(struct t7xx_cldma_hw *hw_info, unsigned int qno)
+{
+ u32 offset = REG_CLDMA_UL_START_ADDRL_0 + qno * ADDR_SIZE;
+
+ return ioread64(hw_info->ap_pdn_base + offset);
+}
+
+void t7xx_cldma_hw_set_start_addr(struct t7xx_cldma_hw *hw_info, unsigned int qno, u64 address,
+ enum mtk_txrx tx_rx)
+{
+ u32 offset = qno * ADDR_SIZE;
+ void __iomem *reg;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_ao_base + REG_CLDMA_DL_START_ADDRL_0 :
+ hw_info->ap_pdn_base + REG_CLDMA_UL_START_ADDRL_0;
+ iowrite64(address, reg + offset);
+}
+
+void t7xx_cldma_hw_resume_queue(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx)
+{
+ void __iomem *base = hw_info->ap_pdn_base;
+
+ if (tx_rx == MTK_RX)
+ iowrite32(BIT(qno), base + REG_CLDMA_DL_RESUME_CMD);
+ else
+ iowrite32(BIT(qno), base + REG_CLDMA_UL_RESUME_CMD);
+}
+
+unsigned int t7xx_cldma_hw_queue_status(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+ u32 mask, val;
+
+ mask = qno == CLDMA_ALL_Q ? CLDMA_ALL_Q : BIT(qno);
+ reg = tx_rx == MTK_RX ? hw_info->ap_ao_base + REG_CLDMA_DL_STATUS :
+ hw_info->ap_pdn_base + REG_CLDMA_UL_STATUS;
+ val = ioread32(reg);
+
+ return val & mask;
+}
+
+void t7xx_cldma_hw_tx_done(struct t7xx_cldma_hw *hw_info, unsigned int bitmask)
+{
+ unsigned int ch_id;
+
+ ch_id = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L2TISAR0);
+ ch_id &= bitmask;
+ /* Clear the ch IDs in the TX interrupt status register */
+ iowrite32(ch_id, hw_info->ap_pdn_base + REG_CLDMA_L2TISAR0);
+ ioread32(hw_info->ap_pdn_base + REG_CLDMA_L2TISAR0);
+}
+
+void t7xx_cldma_hw_rx_done(struct t7xx_cldma_hw *hw_info, unsigned int bitmask)
+{
+ unsigned int ch_id;
+
+ ch_id = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L2RISAR0);
+ ch_id &= bitmask;
+ /* Clear the ch IDs in the RX interrupt status register */
+ iowrite32(ch_id, hw_info->ap_pdn_base + REG_CLDMA_L2RISAR0);
+ ioread32(hw_info->ap_pdn_base + REG_CLDMA_L2RISAR0);
+}
+
+unsigned int t7xx_cldma_hw_int_status(struct t7xx_cldma_hw *hw_info, unsigned int bitmask,
+ enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+ u32 val;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_pdn_base + REG_CLDMA_L2RISAR0 :
+ hw_info->ap_pdn_base + REG_CLDMA_L2TISAR0;
+ val = ioread32(reg);
+ return val & bitmask;
+}
+
+void t7xx_cldma_hw_irq_dis_txrx(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+ u32 val;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_ao_base + REG_CLDMA_L2RIMSR0 :
+ hw_info->ap_pdn_base + REG_CLDMA_L2TIMSR0;
+ val = qno == CLDMA_ALL_Q ? CLDMA_ALL_Q : BIT(qno);
+ iowrite32(val, reg);
+}
+
+void t7xx_cldma_hw_irq_dis_eq(struct t7xx_cldma_hw *hw_info, unsigned int qno, enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+ u32 val;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_ao_base + REG_CLDMA_L2RIMSR0 :
+ hw_info->ap_pdn_base + REG_CLDMA_L2TIMSR0;
+ val = qno == CLDMA_ALL_Q ? CLDMA_ALL_Q : BIT(qno);
+ iowrite32(val << EQ_STA_BIT_OFFSET, reg);
+}
+
+void t7xx_cldma_hw_irq_en_txrx(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+ u32 val;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_ao_base + REG_CLDMA_L2RIMCR0 :
+ hw_info->ap_pdn_base + REG_CLDMA_L2TIMCR0;
+ val = qno == CLDMA_ALL_Q ? CLDMA_ALL_Q : BIT(qno);
+ iowrite32(val, reg);
+}
+
+void t7xx_cldma_hw_irq_en_eq(struct t7xx_cldma_hw *hw_info, unsigned int qno, enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+ u32 val;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_ao_base + REG_CLDMA_L2RIMCR0 :
+ hw_info->ap_pdn_base + REG_CLDMA_L2TIMCR0;
+ val = qno == CLDMA_ALL_Q ? CLDMA_ALL_Q : BIT(qno);
+ iowrite32(val << EQ_STA_BIT_OFFSET, reg);
+}
+
+/**
+ * t7xx_cldma_hw_init() - Initialize CLDMA HW.
+ * @hw_info: Pointer to struct t7xx_cldma_hw.
+ *
+ * Write uplink and downlink configuration to CLDMA HW.
+ */
+void t7xx_cldma_hw_init(struct t7xx_cldma_hw *hw_info)
+{
+ u32 ul_cfg, dl_cfg;
+
+ ul_cfg = ioread32(hw_info->ap_pdn_base + REG_CLDMA_UL_CFG);
+ dl_cfg = ioread32(hw_info->ap_ao_base + REG_CLDMA_DL_CFG);
+ /* Configure the DRAM address mode */
+ ul_cfg &= ~UL_CFG_BIT_MODE_MASK;
+ dl_cfg &= ~DL_CFG_BIT_MODE_MASK;
+
+ if (hw_info->hw_mode == MODE_BIT_64) {
+ ul_cfg |= UL_CFG_BIT_MODE_64;
+ dl_cfg |= DL_CFG_BIT_MODE_64;
+ } else if (hw_info->hw_mode == MODE_BIT_40) {
+ ul_cfg |= UL_CFG_BIT_MODE_40;
+ dl_cfg |= DL_CFG_BIT_MODE_40;
+ } else if (hw_info->hw_mode == MODE_BIT_36) {
+ ul_cfg |= UL_CFG_BIT_MODE_36;
+ dl_cfg |= DL_CFG_BIT_MODE_36;
+ }
+
+ iowrite32(ul_cfg, hw_info->ap_pdn_base + REG_CLDMA_UL_CFG);
+ dl_cfg |= DL_CFG_UP_HW_LAST;
+ iowrite32(dl_cfg, hw_info->ap_ao_base + REG_CLDMA_DL_CFG);
+ iowrite32(0, hw_info->ap_ao_base + REG_CLDMA_INT_MASK);
+ iowrite32(BUSY_MASK_MD, hw_info->ap_ao_base + REG_CLDMA_BUSY_MASK);
+ iowrite32(UL_MEM_CHECK_DIS, hw_info->ap_pdn_base + REG_CLDMA_UL_MEM);
+ iowrite32(DL_MEM_CHECK_DIS, hw_info->ap_pdn_base + REG_CLDMA_DL_MEM);
+}
+
+void t7xx_cldma_hw_stop_all_qs(struct t7xx_cldma_hw *hw_info, enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_pdn_base + REG_CLDMA_DL_STOP_CMD :
+ hw_info->ap_pdn_base + REG_CLDMA_UL_STOP_CMD;
+ iowrite32(CLDMA_ALL_Q, reg);
+}
+
+void t7xx_cldma_hw_stop(struct t7xx_cldma_hw *hw_info, enum mtk_txrx tx_rx)
+{
+ void __iomem *reg;
+
+ reg = tx_rx == MTK_RX ? hw_info->ap_ao_base + REG_CLDMA_L2RIMSR0 :
+ hw_info->ap_pdn_base + REG_CLDMA_L2TIMSR0;
+ iowrite32(TXRX_STATUS_BITMASK, reg);
+ iowrite32(EMPTY_STATUS_BITMASK, reg);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_cldma.h b/drivers/net/wwan/t7xx/t7xx_cldma.h
new file mode 100644
index 000000000000..8949e8377fb0
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_cldma.h
@@ -0,0 +1,180 @@
+/* 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]>
+ * Ricardo Martinez <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Andy Shevchenko <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_CLDMA_H__
+#define __T7XX_CLDMA_H__
+
+#include <linux/bits.h>
+#include <linux/types.h>
+
+#define CLDMA_TXQ_NUM 8
+#define CLDMA_RXQ_NUM 8
+#define CLDMA_ALL_Q GENMASK(7, 0)
+
+/* Interrupt status bits */
+#define EMPTY_STATUS_BITMASK GENMASK(15, 8)
+#define TXRX_STATUS_BITMASK GENMASK(7, 0)
+#define EQ_STA_BIT_OFFSET 8
+#define L2_INT_BIT_COUNT 16
+#define EQ_STA_BIT(index) (BIT((index) + EQ_STA_BIT_OFFSET) & EMPTY_STATUS_BITMASK)
+
+#define TQ_ERR_INT_BITMASK GENMASK(23, 16)
+#define TQ_ACTIVE_START_ERR_INT_BITMASK GENMASK(31, 24)
+
+#define RQ_ERR_INT_BITMASK GENMASK(23, 16)
+#define RQ_ACTIVE_START_ERR_INT_BITMASK GENMASK(31, 24)
+
+#define CLDMA0_AO_BASE 0x10049000
+#define CLDMA0_PD_BASE 0x1021d000
+#define CLDMA1_AO_BASE 0x1004b000
+#define CLDMA1_PD_BASE 0x1021f000
+
+#define CLDMA_R_AO_BASE 0x10023000
+#define CLDMA_R_PD_BASE 0x1023d000
+
+/* CLDMA TX */
+#define REG_CLDMA_UL_START_ADDRL_0 0x0004
+#define REG_CLDMA_UL_START_ADDRH_0 0x0008
+#define REG_CLDMA_UL_CURRENT_ADDRL_0 0x0044
+#define REG_CLDMA_UL_CURRENT_ADDRH_0 0x0048
+#define REG_CLDMA_UL_STATUS 0x0084
+#define REG_CLDMA_UL_START_CMD 0x0088
+#define REG_CLDMA_UL_RESUME_CMD 0x008c
+#define REG_CLDMA_UL_STOP_CMD 0x0090
+#define REG_CLDMA_UL_ERROR 0x0094
+#define REG_CLDMA_UL_CFG 0x0098
+#define UL_CFG_BIT_MODE_36 BIT(5)
+#define UL_CFG_BIT_MODE_40 BIT(6)
+#define UL_CFG_BIT_MODE_64 BIT(7)
+#define UL_CFG_BIT_MODE_MASK GENMASK(7, 5)
+
+#define REG_CLDMA_UL_MEM 0x009c
+#define UL_MEM_CHECK_DIS BIT(0)
+
+/* CLDMA RX */
+#define REG_CLDMA_DL_START_CMD 0x05bc
+#define REG_CLDMA_DL_RESUME_CMD 0x05c0
+#define REG_CLDMA_DL_STOP_CMD 0x05c4
+#define REG_CLDMA_DL_MEM 0x0508
+#define DL_MEM_CHECK_DIS BIT(0)
+
+#define REG_CLDMA_DL_CFG 0x0404
+#define DL_CFG_UP_HW_LAST BIT(2)
+#define DL_CFG_BIT_MODE_36 BIT(10)
+#define DL_CFG_BIT_MODE_40 BIT(11)
+#define DL_CFG_BIT_MODE_64 BIT(12)
+#define DL_CFG_BIT_MODE_MASK GENMASK(12, 10)
+
+#define REG_CLDMA_DL_START_ADDRL_0 0x0478
+#define REG_CLDMA_DL_START_ADDRH_0 0x047c
+#define REG_CLDMA_DL_CURRENT_ADDRL_0 0x04b8
+#define REG_CLDMA_DL_CURRENT_ADDRH_0 0x04bc
+#define REG_CLDMA_DL_STATUS 0x04f8
+
+/* CLDMA MISC */
+#define REG_CLDMA_L2TISAR0 0x0810
+#define REG_CLDMA_L2TISAR1 0x0814
+#define REG_CLDMA_L2TIMR0 0x0818
+#define REG_CLDMA_L2TIMR1 0x081c
+#define REG_CLDMA_L2TIMCR0 0x0820
+#define REG_CLDMA_L2TIMCR1 0x0824
+#define REG_CLDMA_L2TIMSR0 0x0828
+#define REG_CLDMA_L2TIMSR1 0x082c
+#define REG_CLDMA_L3TISAR0 0x0830
+#define REG_CLDMA_L3TISAR1 0x0834
+#define REG_CLDMA_L2RISAR0 0x0850
+#define REG_CLDMA_L2RISAR1 0x0854
+#define REG_CLDMA_L3RISAR0 0x0870
+#define REG_CLDMA_L3RISAR1 0x0874
+#define REG_CLDMA_IP_BUSY 0x08b4
+#define IP_BUSY_WAKEUP BIT(0)
+#define CLDMA_L2TISAR0_ALL_INT_MASK GENMASK(15, 0)
+#define CLDMA_L2RISAR0_ALL_INT_MASK GENMASK(15, 0)
+
+/* CLDMA MISC */
+#define REG_CLDMA_L2RIMR0 0x0858
+#define REG_CLDMA_L2RIMR1 0x085c
+#define REG_CLDMA_L2RIMCR0 0x0860
+#define REG_CLDMA_L2RIMCR1 0x0864
+#define REG_CLDMA_L2RIMSR0 0x0868
+#define REG_CLDMA_L2RIMSR1 0x086c
+#define REG_CLDMA_BUSY_MASK 0x0954
+#define BUSY_MASK_PCIE BIT(0)
+#define BUSY_MASK_AP BIT(1)
+#define BUSY_MASK_MD BIT(2)
+
+#define REG_CLDMA_INT_MASK 0x0960
+
+/* CLDMA RESET */
+#define REG_INFRA_RST4_SET 0x0730
+#define RST4_CLDMA1_SW_RST_SET BIT(20)
+
+#define REG_INFRA_RST4_CLR 0x0734
+#define RST4_CLDMA1_SW_RST_CLR BIT(20)
+
+#define REG_INFRA_RST2_SET 0x0140
+#define RST2_PMIC_SW_RST_SET BIT(18)
+
+#define REG_INFRA_RST2_CLR 0x0144
+#define RST2_PMIC_SW_RST_CLR BIT(18)
+
+enum mtk_txrx {
+ MTK_TX,
+ MTK_RX,
+};
+
+enum t7xx_hw_mode {
+ MODE_BIT_32,
+ MODE_BIT_36,
+ MODE_BIT_40,
+ MODE_BIT_64,
+};
+
+struct t7xx_cldma_hw {
+ enum t7xx_hw_mode hw_mode;
+ void __iomem *ap_ao_base;
+ void __iomem *ap_pdn_base;
+ u32 phy_interrupt_id;
+};
+
+void t7xx_cldma_hw_irq_dis_txrx(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_irq_dis_eq(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_irq_en_txrx(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_irq_en_eq(struct t7xx_cldma_hw *hw_info, unsigned int qno, enum mtk_txrx tx_rx);
+unsigned int t7xx_cldma_hw_queue_status(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_init(struct t7xx_cldma_hw *hw_info);
+void t7xx_cldma_hw_resume_queue(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_start(struct t7xx_cldma_hw *hw_info);
+void t7xx_cldma_hw_start_queue(struct t7xx_cldma_hw *hw_info, unsigned int qno,
+ enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_tx_done(struct t7xx_cldma_hw *hw_info, unsigned int bitmask);
+void t7xx_cldma_hw_rx_done(struct t7xx_cldma_hw *hw_info, unsigned int bitmask);
+void t7xx_cldma_hw_stop_all_qs(struct t7xx_cldma_hw *hw_info, enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_set_start_addr(struct t7xx_cldma_hw *hw_info,
+ unsigned int qno, u64 address, enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_reset(void __iomem *ao_base);
+void t7xx_cldma_hw_stop(struct t7xx_cldma_hw *hw_info, enum mtk_txrx tx_rx);
+unsigned int t7xx_cldma_hw_int_status(struct t7xx_cldma_hw *hw_info, unsigned int bitmask,
+ enum mtk_txrx tx_rx);
+void t7xx_cldma_hw_restore(struct t7xx_cldma_hw *hw_info);
+void t7xx_cldma_clear_ip_busy(struct t7xx_cldma_hw *hw_info);
+bool t7xx_cldma_tx_addr_is_set(struct t7xx_cldma_hw *hw_info, unsigned int qno);
+#endif
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
new file mode 100644
index 000000000000..c756b1d0b519
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
@@ -0,0 +1,1192 @@
+// 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]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Andy Shevchenko <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ */
+
+#include <linux/bits.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-direction.h>
+#include <linux/gfp.h>
+#include <linux/io.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/iopoll.h>
+#include <linux/irqreturn.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_cldma.h"
+#include "t7xx_hif_cldma.h"
+#include "t7xx_mhccif.h"
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_reg.h"
+#include "t7xx_state_monitor.h"
+
+#define MAX_TX_BUDGET 16
+#define MAX_RX_BUDGET 16
+
+#define CHECK_Q_STOP_TIMEOUT_US 1000000
+#define CHECK_Q_STOP_STEP_US 10000
+
+#define CLDMA_JUMBO_BUFF_SZ 64528 /* 63kB + CCCI header */
+
+static void md_cd_queue_struct_reset(struct cldma_queue *queue, struct cldma_ctrl *md_ctrl,
+ enum mtk_txrx tx_rx, unsigned int index)
+{
+ queue->dir = tx_rx;
+ queue->index = index;
+ queue->md_ctrl = md_ctrl;
+ queue->tr_ring = NULL;
+ queue->tr_done = NULL;
+ queue->tx_next = NULL;
+}
+
+static void md_cd_queue_struct_init(struct cldma_queue *queue, struct cldma_ctrl *md_ctrl,
+ enum mtk_txrx tx_rx, unsigned int index)
+{
+ md_cd_queue_struct_reset(queue, md_ctrl, tx_rx, index);
+ init_waitqueue_head(&queue->req_wq);
+ spin_lock_init(&queue->ring_lock);
+}
+
+static void t7xx_cldma_gpd_set_data_ptr(struct cldma_gpd *gpd, dma_addr_t data_ptr)
+{
+ gpd->data_buff_bd_ptr_h = cpu_to_le32(upper_32_bits(data_ptr));
+ gpd->data_buff_bd_ptr_l = cpu_to_le32(lower_32_bits(data_ptr));
+}
+
+static void t7xx_cldma_gpd_set_next_ptr(struct cldma_gpd *gpd, dma_addr_t next_ptr)
+{
+ gpd->next_gpd_ptr_h = cpu_to_le32(upper_32_bits(next_ptr));
+ gpd->next_gpd_ptr_l = cpu_to_le32(lower_32_bits(next_ptr));
+}
+
+static int t7xx_cldma_alloc_and_map_skb(struct cldma_ctrl *md_ctrl, struct cldma_request *req,
+ size_t size)
+{
+ req->skb = __dev_alloc_skb(size, GFP_KERNEL);
+ if (!req->skb)
+ return -ENOMEM;
+
+ req->mapped_buff = dma_map_single(md_ctrl->dev, req->skb->data,
+ skb_data_area_size(req->skb), DMA_FROM_DEVICE);
+ if (dma_mapping_error(md_ctrl->dev, req->mapped_buff)) {
+ dev_kfree_skb_any(req->skb);
+ req->skb = NULL;
+ req->mapped_buff = 0;
+ dev_err(md_ctrl->dev, "DMA mapping failed\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int t7xx_cldma_gpd_rx_from_q(struct cldma_queue *queue, int budget, bool *over_budget)
+{
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+ unsigned int hwo_polling_count = 0;
+ struct t7xx_cldma_hw *hw_info;
+ bool rx_not_done = true;
+ unsigned long flags;
+ int count = 0;
+
+ hw_info = &md_ctrl->hw_info;
+
+ do {
+ struct cldma_request *req;
+ struct cldma_gpd *gpd;
+ struct sk_buff *skb;
+ int ret;
+
+ req = queue->tr_done;
+ if (!req)
+ return -ENODATA;
+
+ gpd = req->gpd;
+ if ((gpd->flags & GPD_FLAGS_HWO) || !req->skb) {
+ dma_addr_t gpd_addr;
+
+ if (!pci_device_is_present(to_pci_dev(md_ctrl->dev))) {
+ dev_err(md_ctrl->dev, "PCIe Link disconnected\n");
+ return -ENODEV;
+ }
+
+ gpd_addr = ioread64(hw_info->ap_pdn_base + REG_CLDMA_DL_CURRENT_ADDRL_0 +
+ queue->index * sizeof(u64));
+ if (req->gpd_addr == gpd_addr || hwo_polling_count++ >= 100)
+ return 0;
+
+ udelay(1);
+ continue;
+ }
+
+ hwo_polling_count = 0;
+ skb = req->skb;
+
+ if (req->mapped_buff) {
+ dma_unmap_single(md_ctrl->dev, req->mapped_buff,
+ skb_data_area_size(skb), DMA_FROM_DEVICE);
+ req->mapped_buff = 0;
+ }
+
+ skb->len = 0;
+ skb_reset_tail_pointer(skb);
+ skb_put(skb, le16_to_cpu(gpd->data_buff_len));
+
+ ret = md_ctrl->recv_skb(queue, skb);
+ /* Break processing, will try again later */
+ if (ret < 0)
+ return ret;
+
+ req->skb = NULL;
+ t7xx_cldma_gpd_set_data_ptr(gpd, 0);
+
+ spin_lock_irqsave(&queue->ring_lock, flags);
+ queue->tr_done = list_next_entry_circular(req, &queue->tr_ring->gpd_ring, entry);
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+ req = queue->rx_refill;
+
+ ret = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, queue->tr_ring->pkt_size);
+ if (ret)
+ return ret;
+
+ gpd = req->gpd;
+ t7xx_cldma_gpd_set_data_ptr(gpd, req->mapped_buff);
+ gpd->data_buff_len = 0;
+ gpd->flags = GPD_FLAGS_IOC | GPD_FLAGS_HWO;
+
+ spin_lock_irqsave(&queue->ring_lock, flags);
+ queue->rx_refill = list_next_entry_circular(req, &queue->tr_ring->gpd_ring, entry);
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+
+ rx_not_done = ++count < budget || !need_resched();
+ } while (rx_not_done);
+
+ *over_budget = true;
+ return 0;
+}
+
+static int t7xx_cldma_gpd_rx_collect(struct cldma_queue *queue, int budget)
+{
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+ struct t7xx_cldma_hw *hw_info;
+ unsigned int pending_rx_int;
+ bool over_budget = false;
+ unsigned long flags;
+ int ret;
+
+ hw_info = &md_ctrl->hw_info;
+
+ do {
+ ret = t7xx_cldma_gpd_rx_from_q(queue, budget, &over_budget);
+ if (ret == -ENODATA)
+ return 0;
+ else if (ret)
+ return ret;
+
+ pending_rx_int = 0;
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ if (md_ctrl->rxq_active & BIT(queue->index)) {
+ if (!t7xx_cldma_hw_queue_status(hw_info, queue->index, MTK_RX))
+ t7xx_cldma_hw_resume_queue(hw_info, queue->index, MTK_RX);
+
+ pending_rx_int = t7xx_cldma_hw_int_status(hw_info, BIT(queue->index),
+ MTK_RX);
+ if (pending_rx_int) {
+ t7xx_cldma_hw_rx_done(hw_info, pending_rx_int);
+
+ if (over_budget) {
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+ return -EAGAIN;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+ } while (pending_rx_int);
+
+ return 0;
+}
+
+static void t7xx_cldma_rx_done(struct work_struct *work)
+{
+ struct cldma_queue *queue = container_of(work, struct cldma_queue, cldma_work);
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+ int value;
+
+ value = t7xx_cldma_gpd_rx_collect(queue, queue->budget);
+ if (value && md_ctrl->rxq_active & BIT(queue->index)) {
+ queue_work(queue->worker, &queue->cldma_work);
+ return;
+ }
+
+ t7xx_cldma_clear_ip_busy(&md_ctrl->hw_info);
+ t7xx_cldma_hw_irq_en_txrx(&md_ctrl->hw_info, queue->index, MTK_RX);
+ t7xx_cldma_hw_irq_en_eq(&md_ctrl->hw_info, queue->index, MTK_RX);
+}
+
+static int t7xx_cldma_gpd_tx_collect(struct cldma_queue *queue)
+{
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+ unsigned int dma_len, count = 0;
+ struct cldma_request *req;
+ struct cldma_gpd *gpd;
+ unsigned long flags;
+ dma_addr_t dma_free;
+ struct sk_buff *skb;
+
+ while (!kthread_should_stop()) {
+ spin_lock_irqsave(&queue->ring_lock, flags);
+ req = queue->tr_done;
+ if (!req) {
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+ break;
+ }
+ gpd = req->gpd;
+ if ((gpd->flags & GPD_FLAGS_HWO) || !req->skb) {
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+ break;
+ }
+ queue->budget++;
+ dma_free = req->mapped_buff;
+ dma_len = le16_to_cpu(gpd->data_buff_len);
+ skb = req->skb;
+ req->skb = NULL;
+ queue->tr_done = list_next_entry_circular(req, &queue->tr_ring->gpd_ring, entry);
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+
+ count++;
+ dma_unmap_single(md_ctrl->dev, dma_free, dma_len, DMA_TO_DEVICE);
+ dev_kfree_skb_any(skb);
+ }
+
+ if (count)
+ wake_up_nr(&queue->req_wq, count);
+
+ return count;
+}
+
+static void t7xx_cldma_txq_empty_hndl(struct cldma_queue *queue)
+{
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+ struct cldma_request *req;
+ dma_addr_t ul_curr_addr;
+ unsigned long flags;
+ bool pending_gpd;
+
+ if (!(md_ctrl->txq_active & BIT(queue->index)))
+ return;
+
+ spin_lock_irqsave(&queue->ring_lock, flags);
+ req = list_prev_entry_circular(queue->tx_next, &queue->tr_ring->gpd_ring, entry);
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+
+ pending_gpd = (req->gpd->flags & GPD_FLAGS_HWO) && req->skb;
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ if (pending_gpd) {
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+
+ /* Check current processing TGPD, 64-bit address is in a table by Q index */
+ ul_curr_addr = ioread64(hw_info->ap_pdn_base + REG_CLDMA_UL_CURRENT_ADDRL_0 +
+ queue->index * sizeof(u64));
+ if (req->gpd_addr != ul_curr_addr) {
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+ dev_err(md_ctrl->dev, "CLDMA%d queue %d is not empty\n",
+ md_ctrl->hif_id, queue->index);
+ return;
+ }
+
+ t7xx_cldma_hw_resume_queue(hw_info, queue->index, MTK_TX);
+ }
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+}
+
+static void t7xx_cldma_tx_done(struct work_struct *work)
+{
+ struct cldma_queue *queue = container_of(work, struct cldma_queue, cldma_work);
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+ struct t7xx_cldma_hw *hw_info;
+ unsigned int l2_tx_int;
+ unsigned long flags;
+
+ hw_info = &md_ctrl->hw_info;
+ t7xx_cldma_gpd_tx_collect(queue);
+ l2_tx_int = t7xx_cldma_hw_int_status(hw_info, BIT(queue->index) | EQ_STA_BIT(queue->index),
+ MTK_TX);
+ if (l2_tx_int & EQ_STA_BIT(queue->index)) {
+ t7xx_cldma_hw_tx_done(hw_info, EQ_STA_BIT(queue->index));
+ t7xx_cldma_txq_empty_hndl(queue);
+ }
+
+ if (l2_tx_int & BIT(queue->index)) {
+ t7xx_cldma_hw_tx_done(hw_info, BIT(queue->index));
+ queue_work(queue->worker, &queue->cldma_work);
+ return;
+ }
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ if (md_ctrl->txq_active & BIT(queue->index)) {
+ t7xx_cldma_clear_ip_busy(hw_info);
+ t7xx_cldma_hw_irq_en_eq(hw_info, queue->index, MTK_TX);
+ t7xx_cldma_hw_irq_en_txrx(hw_info, queue->index, MTK_TX);
+ }
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+}
+
+static void t7xx_cldma_ring_free(struct cldma_ctrl *md_ctrl,
+ struct cldma_ring *ring, enum dma_data_direction tx_rx)
+{
+ struct cldma_request *req_cur, *req_next;
+
+ list_for_each_entry_safe(req_cur, req_next, &ring->gpd_ring, entry) {
+ if (req_cur->mapped_buff && req_cur->skb) {
+ dma_unmap_single(md_ctrl->dev, req_cur->mapped_buff,
+ skb_data_area_size(req_cur->skb), tx_rx);
+ req_cur->mapped_buff = 0;
+ }
+
+ dev_kfree_skb_any(req_cur->skb);
+
+ if (req_cur->gpd)
+ dma_pool_free(md_ctrl->gpd_dmapool, req_cur->gpd, req_cur->gpd_addr);
+
+ list_del(&req_cur->entry);
+ kfree(req_cur);
+ }
+}
+
+static struct cldma_request *t7xx_alloc_rx_request(struct cldma_ctrl *md_ctrl, size_t pkt_size)
+{
+ struct cldma_request *req;
+ int val;
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return NULL;
+
+ req->gpd = dma_pool_zalloc(md_ctrl->gpd_dmapool, GFP_KERNEL, &req->gpd_addr);
+ if (!req->gpd)
+ goto err_free_req;
+
+ val = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, pkt_size);
+ if (val)
+ goto err_free_pool;
+
+ return req;
+
+err_free_pool:
+ dma_pool_free(md_ctrl->gpd_dmapool, req->gpd, req->gpd_addr);
+
+err_free_req:
+ kfree(req);
+
+ return NULL;
+}
+
+static int t7xx_cldma_rx_ring_init(struct cldma_ctrl *md_ctrl, struct cldma_ring *ring)
+{
+ struct cldma_request *req;
+ struct cldma_gpd *gpd;
+ int i;
+
+ INIT_LIST_HEAD(&ring->gpd_ring);
+ ring->length = MAX_RX_BUDGET;
+
+ for (i = 0; i < ring->length; i++) {
+ req = t7xx_alloc_rx_request(md_ctrl, ring->pkt_size);
+ if (!req) {
+ t7xx_cldma_ring_free(md_ctrl, ring, DMA_FROM_DEVICE);
+ return -ENOMEM;
+ }
+
+ gpd = req->gpd;
+ t7xx_cldma_gpd_set_data_ptr(gpd, req->mapped_buff);
+ gpd->rx_data_allow_len = cpu_to_le16(ring->pkt_size);
+ gpd->flags = GPD_FLAGS_IOC | GPD_FLAGS_HWO;
+ INIT_LIST_HEAD(&req->entry);
+ list_add_tail(&req->entry, &ring->gpd_ring);
+ }
+
+ /* Link previous GPD to next GPD, circular */
+ list_for_each_entry(req, &ring->gpd_ring, entry) {
+ t7xx_cldma_gpd_set_next_ptr(gpd, req->gpd_addr);
+ gpd = req->gpd;
+ }
+
+ return 0;
+}
+
+static struct cldma_request *t7xx_alloc_tx_request(struct cldma_ctrl *md_ctrl)
+{
+ struct cldma_request *req;
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return NULL;
+
+ req->gpd = dma_pool_zalloc(md_ctrl->gpd_dmapool, GFP_KERNEL, &req->gpd_addr);
+ if (!req->gpd) {
+ kfree(req);
+ return NULL;
+ }
+
+ return req;
+}
+
+static int t7xx_cldma_tx_ring_init(struct cldma_ctrl *md_ctrl, struct cldma_ring *ring)
+{
+ struct cldma_request *req;
+ struct cldma_gpd *gpd;
+ int i;
+
+ INIT_LIST_HEAD(&ring->gpd_ring);
+ ring->length = MAX_TX_BUDGET;
+
+ for (i = 0; i < ring->length; i++) {
+ req = t7xx_alloc_tx_request(md_ctrl);
+ if (!req) {
+ t7xx_cldma_ring_free(md_ctrl, ring, DMA_TO_DEVICE);
+ return -ENOMEM;
+ }
+
+ gpd = req->gpd;
+ gpd->flags = GPD_FLAGS_IOC;
+ INIT_LIST_HEAD(&req->entry);
+ list_add_tail(&req->entry, &ring->gpd_ring);
+ }
+
+ /* Link previous GPD to next GPD, circular */
+ list_for_each_entry(req, &ring->gpd_ring, entry) {
+ t7xx_cldma_gpd_set_next_ptr(gpd, req->gpd_addr);
+ gpd = req->gpd;
+ }
+
+ return 0;
+}
+
+/**
+ * t7xx_cldma_q_reset() - Reset CLDMA request pointers to their initial values.
+ * @queue: Pointer to the queue structure.
+ *
+ * Called with ring_lock (unless called during initialization phase)
+ */
+static void t7xx_cldma_q_reset(struct cldma_queue *queue)
+{
+ struct cldma_request *req;
+
+ req = list_first_entry(&queue->tr_ring->gpd_ring, struct cldma_request, entry);
+ queue->tr_done = req;
+ queue->budget = queue->tr_ring->length;
+
+ if (queue->dir == MTK_TX)
+ queue->tx_next = req;
+ else
+ queue->rx_refill = req;
+}
+
+static void t7xx_cldma_rxq_init(struct cldma_queue *queue)
+{
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+
+ queue->dir = MTK_RX;
+ queue->tr_ring = &md_ctrl->rx_ring[queue->index];
+ t7xx_cldma_q_reset(queue);
+}
+
+static void t7xx_cldma_txq_init(struct cldma_queue *queue)
+{
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+
+ queue->dir = MTK_TX;
+ queue->tr_ring = &md_ctrl->tx_ring[queue->index];
+ t7xx_cldma_q_reset(queue);
+}
+
+static void t7xx_cldma_enable_irq(struct cldma_ctrl *md_ctrl)
+{
+ t7xx_pcie_mac_set_int(md_ctrl->t7xx_dev, md_ctrl->hw_info.phy_interrupt_id);
+}
+
+static void t7xx_cldma_disable_irq(struct cldma_ctrl *md_ctrl)
+{
+ t7xx_pcie_mac_clear_int(md_ctrl->t7xx_dev, md_ctrl->hw_info.phy_interrupt_id);
+}
+
+static void t7xx_cldma_irq_work_cb(struct cldma_ctrl *md_ctrl)
+{
+ unsigned long l2_tx_int_msk, l2_rx_int_msk, l2_tx_int, l2_rx_int, val;
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ int i;
+
+ /* L2 raw interrupt status */
+ l2_tx_int = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L2TISAR0);
+ l2_rx_int = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L2RISAR0);
+ l2_tx_int_msk = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L2TIMR0);
+ l2_rx_int_msk = ioread32(hw_info->ap_ao_base + REG_CLDMA_L2RIMR0);
+ l2_tx_int &= ~l2_tx_int_msk;
+ l2_rx_int &= ~l2_rx_int_msk;
+
+ if (l2_tx_int) {
+ if (l2_tx_int & (TQ_ERR_INT_BITMASK | TQ_ACTIVE_START_ERR_INT_BITMASK)) {
+ /* Read and clear L3 TX interrupt status */
+ val = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L3TISAR0);
+ iowrite32(val, hw_info->ap_pdn_base + REG_CLDMA_L3TISAR0);
+ val = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L3TISAR1);
+ iowrite32(val, hw_info->ap_pdn_base + REG_CLDMA_L3TISAR1);
+ }
+
+ t7xx_cldma_hw_tx_done(hw_info, l2_tx_int);
+ if (l2_tx_int & (TXRX_STATUS_BITMASK | EMPTY_STATUS_BITMASK)) {
+ for_each_set_bit(i, &l2_tx_int, L2_INT_BIT_COUNT) {
+ if (i < CLDMA_TXQ_NUM) {
+ t7xx_cldma_hw_irq_dis_eq(hw_info, i, MTK_TX);
+ t7xx_cldma_hw_irq_dis_txrx(hw_info, i, MTK_TX);
+ queue_work(md_ctrl->txq[i].worker,
+ &md_ctrl->txq[i].cldma_work);
+ } else {
+ t7xx_cldma_txq_empty_hndl(&md_ctrl->txq[i - CLDMA_TXQ_NUM]);
+ }
+ }
+ }
+ }
+
+ if (l2_rx_int) {
+ if (l2_rx_int & (RQ_ERR_INT_BITMASK | RQ_ACTIVE_START_ERR_INT_BITMASK)) {
+ /* Read and clear L3 RX interrupt status */
+ val = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L3RISAR0);
+ iowrite32(val, hw_info->ap_pdn_base + REG_CLDMA_L3RISAR0);
+ val = ioread32(hw_info->ap_pdn_base + REG_CLDMA_L3RISAR1);
+ iowrite32(val, hw_info->ap_pdn_base + REG_CLDMA_L3RISAR1);
+ }
+
+ t7xx_cldma_hw_rx_done(hw_info, l2_rx_int);
+ if (l2_rx_int & (TXRX_STATUS_BITMASK | EMPTY_STATUS_BITMASK)) {
+ l2_rx_int |= l2_rx_int >> CLDMA_RXQ_NUM;
+ for_each_set_bit(i, &l2_rx_int, CLDMA_RXQ_NUM) {
+ t7xx_cldma_hw_irq_dis_eq(hw_info, i, MTK_RX);
+ t7xx_cldma_hw_irq_dis_txrx(hw_info, i, MTK_RX);
+ queue_work(md_ctrl->rxq[i].worker, &md_ctrl->rxq[i].cldma_work);
+ }
+ }
+ }
+}
+
+static bool t7xx_cldma_qs_are_active(struct cldma_ctrl *md_ctrl)
+{
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ unsigned int tx_active;
+ unsigned int rx_active;
+
+ if (!pci_device_is_present(to_pci_dev(md_ctrl->dev)))
+ return false;
+
+ tx_active = t7xx_cldma_hw_queue_status(hw_info, CLDMA_ALL_Q, MTK_TX);
+ rx_active = t7xx_cldma_hw_queue_status(hw_info, CLDMA_ALL_Q, MTK_RX);
+
+ return tx_active || rx_active;
+}
+
+/**
+ * t7xx_cldma_stop() - Stop CLDMA.
+ * @md_ctrl: CLDMA context structure.
+ *
+ * Stop TX and RX queues. Disable L1 and L2 interrupts.
+ * Clear status registers.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ERROR - Error code from polling cldma_queues_active.
+ */
+int t7xx_cldma_stop(struct cldma_ctrl *md_ctrl)
+{
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ bool active;
+ int i, ret;
+
+ md_ctrl->rxq_active = 0;
+ t7xx_cldma_hw_stop_all_qs(hw_info, MTK_RX);
+ md_ctrl->txq_active = 0;
+ t7xx_cldma_hw_stop_all_qs(hw_info, MTK_TX);
+ md_ctrl->txq_started = 0;
+ t7xx_cldma_disable_irq(md_ctrl);
+ t7xx_cldma_hw_stop(hw_info, MTK_RX);
+ t7xx_cldma_hw_stop(hw_info, MTK_TX);
+ t7xx_cldma_hw_tx_done(hw_info, CLDMA_L2TISAR0_ALL_INT_MASK);
+ t7xx_cldma_hw_rx_done(hw_info, CLDMA_L2RISAR0_ALL_INT_MASK);
+
+ if (md_ctrl->is_late_init) {
+ for (i = 0; i < CLDMA_TXQ_NUM; i++)
+ flush_work(&md_ctrl->txq[i].cldma_work);
+
+ for (i = 0; i < CLDMA_RXQ_NUM; i++)
+ flush_work(&md_ctrl->rxq[i].cldma_work);
+ }
+
+ ret = read_poll_timeout(t7xx_cldma_qs_are_active, active, !active, CHECK_Q_STOP_STEP_US,
+ CHECK_Q_STOP_TIMEOUT_US, true, md_ctrl);
+ if (ret)
+ dev_err(md_ctrl->dev, "Could not stop CLDMA%d queues", md_ctrl->hif_id);
+
+ return ret;
+}
+
+static void t7xx_cldma_late_release(struct cldma_ctrl *md_ctrl)
+{
+ int i;
+
+ if (!md_ctrl->is_late_init)
+ return;
+
+ for (i = 0; i < CLDMA_TXQ_NUM; i++)
+ t7xx_cldma_ring_free(md_ctrl, &md_ctrl->tx_ring[i], DMA_TO_DEVICE);
+
+ for (i = 0; i < CLDMA_RXQ_NUM; i++)
+ t7xx_cldma_ring_free(md_ctrl, &md_ctrl->rx_ring[i], DMA_FROM_DEVICE);
+
+ dma_pool_destroy(md_ctrl->gpd_dmapool);
+ md_ctrl->gpd_dmapool = NULL;
+ md_ctrl->is_late_init = false;
+}
+
+void t7xx_cldma_reset(struct cldma_ctrl *md_ctrl)
+{
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ md_ctrl->txq_active = 0;
+ md_ctrl->rxq_active = 0;
+ t7xx_cldma_disable_irq(md_ctrl);
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+
+ for (i = 0; i < CLDMA_TXQ_NUM; i++) {
+ cancel_work_sync(&md_ctrl->txq[i].cldma_work);
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ md_cd_queue_struct_reset(&md_ctrl->txq[i], md_ctrl, MTK_TX, i);
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+ }
+
+ for (i = 0; i < CLDMA_RXQ_NUM; i++) {
+ cancel_work_sync(&md_ctrl->rxq[i].cldma_work);
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ md_cd_queue_struct_reset(&md_ctrl->rxq[i], md_ctrl, MTK_RX, i);
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+ }
+
+ t7xx_cldma_late_release(md_ctrl);
+}
+
+/**
+ * t7xx_cldma_start() - Start CLDMA.
+ * @md_ctrl: CLDMA context structure.
+ *
+ * Set TX/RX start address.
+ * Start all RX queues and enable L2 interrupt.
+ */
+void t7xx_cldma_start(struct cldma_ctrl *md_ctrl)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ if (md_ctrl->is_late_init) {
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ int i;
+
+ t7xx_cldma_enable_irq(md_ctrl);
+
+ for (i = 0; i < CLDMA_TXQ_NUM; i++) {
+ if (md_ctrl->txq[i].tr_done)
+ t7xx_cldma_hw_set_start_addr(hw_info, i,
+ md_ctrl->txq[i].tr_done->gpd_addr,
+ MTK_TX);
+ }
+
+ for (i = 0; i < CLDMA_RXQ_NUM; i++) {
+ if (md_ctrl->rxq[i].tr_done)
+ t7xx_cldma_hw_set_start_addr(hw_info, i,
+ md_ctrl->rxq[i].tr_done->gpd_addr,
+ MTK_RX);
+ }
+
+ /* Enable L2 interrupt */
+ t7xx_cldma_hw_start_queue(hw_info, CLDMA_ALL_Q, MTK_RX);
+ t7xx_cldma_hw_start(hw_info);
+ md_ctrl->txq_started = 0;
+ md_ctrl->txq_active |= TXRX_STATUS_BITMASK;
+ md_ctrl->rxq_active |= TXRX_STATUS_BITMASK;
+ }
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+}
+
+static void t7xx_cldma_clear_txq(struct cldma_ctrl *md_ctrl, int qnum)
+{
+ struct cldma_queue *txq = &md_ctrl->txq[qnum];
+ struct cldma_request *req;
+ struct cldma_gpd *gpd;
+ unsigned long flags;
+
+ spin_lock_irqsave(&txq->ring_lock, flags);
+ t7xx_cldma_q_reset(txq);
+ list_for_each_entry(req, &txq->tr_ring->gpd_ring, entry) {
+ gpd = req->gpd;
+ gpd->flags &= ~GPD_FLAGS_HWO;
+ t7xx_cldma_gpd_set_data_ptr(gpd, 0);
+ gpd->data_buff_len = 0;
+ dev_kfree_skb_any(req->skb);
+ req->skb = NULL;
+ }
+ spin_unlock_irqrestore(&txq->ring_lock, flags);
+}
+
+static int t7xx_cldma_clear_rxq(struct cldma_ctrl *md_ctrl, int qnum)
+{
+ struct cldma_queue *rxq = &md_ctrl->rxq[qnum];
+ struct cldma_request *req;
+ struct cldma_gpd *gpd;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&rxq->ring_lock, flags);
+ t7xx_cldma_q_reset(rxq);
+ list_for_each_entry(req, &rxq->tr_ring->gpd_ring, entry) {
+ gpd = req->gpd;
+ gpd->flags = GPD_FLAGS_IOC | GPD_FLAGS_HWO;
+ gpd->data_buff_len = 0;
+
+ if (req->skb) {
+ req->skb->len = 0;
+ skb_reset_tail_pointer(req->skb);
+ }
+ }
+
+ list_for_each_entry(req, &rxq->tr_ring->gpd_ring, entry) {
+ if (req->skb)
+ continue;
+
+ ret = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, rxq->tr_ring->pkt_size);
+ if (ret)
+ break;
+
+ t7xx_cldma_gpd_set_data_ptr(req->gpd, req->mapped_buff);
+ }
+ spin_unlock_irqrestore(&rxq->ring_lock, flags);
+
+ return ret;
+}
+
+void t7xx_cldma_clear_all_qs(struct cldma_ctrl *md_ctrl, enum mtk_txrx tx_rx)
+{
+ int i;
+
+ if (tx_rx == MTK_TX) {
+ for (i = 0; i < CLDMA_TXQ_NUM; i++)
+ t7xx_cldma_clear_txq(md_ctrl, i);
+ } else {
+ for (i = 0; i < CLDMA_RXQ_NUM; i++)
+ t7xx_cldma_clear_rxq(md_ctrl, i);
+ }
+}
+
+void t7xx_cldma_stop_all_qs(struct cldma_ctrl *md_ctrl, enum mtk_txrx tx_rx)
+{
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ unsigned long flags;
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ t7xx_cldma_hw_irq_dis_eq(hw_info, CLDMA_ALL_Q, tx_rx);
+ t7xx_cldma_hw_irq_dis_txrx(hw_info, CLDMA_ALL_Q, tx_rx);
+ if (tx_rx == MTK_RX)
+ md_ctrl->rxq_active &= ~TXRX_STATUS_BITMASK;
+ else
+ md_ctrl->txq_active &= ~TXRX_STATUS_BITMASK;
+ t7xx_cldma_hw_stop_all_qs(hw_info, tx_rx);
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+}
+
+static int t7xx_cldma_gpd_handle_tx_request(struct cldma_queue *queue, struct cldma_request *tx_req,
+ struct sk_buff *skb)
+{
+ struct cldma_ctrl *md_ctrl = queue->md_ctrl;
+ struct cldma_gpd *gpd = tx_req->gpd;
+ unsigned long flags;
+
+ /* Update GPD */
+ tx_req->mapped_buff = dma_map_single(md_ctrl->dev, skb->data, skb->len, DMA_TO_DEVICE);
+
+ if (dma_mapping_error(md_ctrl->dev, tx_req->mapped_buff)) {
+ dev_err(md_ctrl->dev, "DMA mapping failed\n");
+ return -ENOMEM;
+ }
+
+ t7xx_cldma_gpd_set_data_ptr(gpd, tx_req->mapped_buff);
+ gpd->data_buff_len = cpu_to_le16(skb->len);
+
+ /* This lock must cover TGPD setting, as even without a resume operation,
+ * CLDMA can send next HWO=1 if last TGPD just finished.
+ */
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ if (md_ctrl->txq_active & BIT(queue->index))
+ gpd->flags |= GPD_FLAGS_HWO;
+
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+
+ tx_req->skb = skb;
+ return 0;
+}
+
+/* Called with cldma_lock */
+static void t7xx_cldma_hw_start_send(struct cldma_ctrl *md_ctrl, int qno,
+ struct cldma_request *prev_req)
+{
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+
+ /* Check whether the device was powered off (CLDMA start address is not set) */
+ if (!t7xx_cldma_tx_addr_is_set(hw_info, qno)) {
+ t7xx_cldma_hw_init(hw_info);
+ t7xx_cldma_hw_set_start_addr(hw_info, qno, prev_req->gpd_addr, MTK_TX);
+ md_ctrl->txq_started &= ~BIT(qno);
+ }
+
+ if (!t7xx_cldma_hw_queue_status(hw_info, qno, MTK_TX)) {
+ if (md_ctrl->txq_started & BIT(qno))
+ t7xx_cldma_hw_resume_queue(hw_info, qno, MTK_TX);
+ else
+ t7xx_cldma_hw_start_queue(hw_info, qno, MTK_TX);
+
+ md_ctrl->txq_started |= BIT(qno);
+ }
+}
+
+/**
+ * t7xx_cldma_set_recv_skb() - Set the callback to handle RX packets.
+ * @md_ctrl: CLDMA context structure.
+ * @recv_skb: Receiving skb callback.
+ */
+void t7xx_cldma_set_recv_skb(struct cldma_ctrl *md_ctrl,
+ int (*recv_skb)(struct cldma_queue *queue, struct sk_buff *skb))
+{
+ md_ctrl->recv_skb = recv_skb;
+}
+
+/**
+ * t7xx_cldma_send_skb() - Send control data to modem.
+ * @md_ctrl: CLDMA context structure.
+ * @qno: Queue number.
+ * @skb: Socket buffer.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ENOMEM - Allocation failure.
+ * * -EINVAL - Invalid queue request.
+ * * -EIO - Queue is not active.
+ * * -ETIMEDOUT - Timeout waiting for the device to wake up.
+ */
+int t7xx_cldma_send_skb(struct cldma_ctrl *md_ctrl, int qno, struct sk_buff *skb)
+{
+ struct cldma_request *tx_req;
+ struct cldma_queue *queue;
+ unsigned long flags;
+ int ret;
+
+ if (qno >= CLDMA_TXQ_NUM)
+ return -EINVAL;
+
+ queue = &md_ctrl->txq[qno];
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ if (!(md_ctrl->txq_active & BIT(qno))) {
+ ret = -EIO;
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+ goto allow_sleep;
+ }
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+
+ do {
+ spin_lock_irqsave(&queue->ring_lock, flags);
+ tx_req = queue->tx_next;
+ if (queue->budget > 0 && !tx_req->skb) {
+ struct list_head *gpd_ring = &queue->tr_ring->gpd_ring;
+
+ queue->budget--;
+ t7xx_cldma_gpd_handle_tx_request(queue, tx_req, skb);
+ queue->tx_next = list_next_entry_circular(tx_req, gpd_ring, entry);
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+
+ /* Protect the access to the modem for queues operations (resume/start)
+ * which access shared locations by all the queues.
+ * cldma_lock is independent of ring_lock which is per queue.
+ */
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ t7xx_cldma_hw_start_send(md_ctrl, qno, tx_req);
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+
+ break;
+ }
+ spin_unlock_irqrestore(&queue->ring_lock, flags);
+
+ if (!t7xx_cldma_hw_queue_status(&md_ctrl->hw_info, qno, MTK_TX)) {
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ t7xx_cldma_hw_resume_queue(&md_ctrl->hw_info, qno, MTK_TX);
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+ }
+
+ ret = wait_event_interruptible_exclusive(queue->req_wq, queue->budget > 0);
+ } while (!ret);
+
+allow_sleep:
+ return ret;
+}
+
+static int t7xx_cldma_late_init(struct cldma_ctrl *md_ctrl)
+{
+ char dma_pool_name[32];
+ int i, j, ret;
+
+ if (md_ctrl->is_late_init) {
+ dev_err(md_ctrl->dev, "CLDMA late init was already done\n");
+ return -EALREADY;
+ }
+
+ snprintf(dma_pool_name, sizeof(dma_pool_name), "cldma_req_hif%d", md_ctrl->hif_id);
+
+ md_ctrl->gpd_dmapool = dma_pool_create(dma_pool_name, md_ctrl->dev,
+ sizeof(struct cldma_gpd), GPD_DMAPOOL_ALIGN, 0);
+ if (!md_ctrl->gpd_dmapool) {
+ dev_err(md_ctrl->dev, "DMA pool alloc fail\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < CLDMA_TXQ_NUM; i++) {
+ ret = t7xx_cldma_tx_ring_init(md_ctrl, &md_ctrl->tx_ring[i]);
+ if (ret) {
+ dev_err(md_ctrl->dev, "control TX ring init fail\n");
+ goto err_free_tx_ring;
+ }
+ }
+
+ for (j = 0; j < CLDMA_RXQ_NUM; j++) {
+ md_ctrl->rx_ring[j].pkt_size = CLDMA_MTU;
+
+ if (j == CLDMA_RXQ_NUM - 1)
+ md_ctrl->rx_ring[j].pkt_size = CLDMA_JUMBO_BUFF_SZ;
+
+ ret = t7xx_cldma_rx_ring_init(md_ctrl, &md_ctrl->rx_ring[j]);
+ if (ret) {
+ dev_err(md_ctrl->dev, "Control RX ring init fail\n");
+ goto err_free_rx_ring;
+ }
+ }
+
+ for (i = 0; i < CLDMA_TXQ_NUM; i++)
+ t7xx_cldma_txq_init(&md_ctrl->txq[i]);
+
+ for (j = 0; j < CLDMA_RXQ_NUM; j++)
+ t7xx_cldma_rxq_init(&md_ctrl->rxq[j]);
+
+ md_ctrl->is_late_init = true;
+ return 0;
+
+err_free_rx_ring:
+ while (j--)
+ t7xx_cldma_ring_free(md_ctrl, &md_ctrl->rx_ring[j], DMA_FROM_DEVICE);
+
+err_free_tx_ring:
+ while (i--)
+ t7xx_cldma_ring_free(md_ctrl, &md_ctrl->tx_ring[i], DMA_TO_DEVICE);
+
+ return ret;
+}
+
+static void __iomem *t7xx_pcie_addr_transfer(void __iomem *addr, u32 addr_trs1, u32 phy_addr)
+{
+ return addr + phy_addr - addr_trs1;
+}
+
+static void t7xx_hw_info_init(struct cldma_ctrl *md_ctrl)
+{
+ struct t7xx_addr_base *pbase = &md_ctrl->t7xx_dev->base_addr;
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ u32 phy_ao_base, phy_pd_base;
+
+ if (md_ctrl->hif_id != CLDMA_ID_MD)
+ return;
+
+ phy_ao_base = CLDMA1_AO_BASE;
+ phy_pd_base = CLDMA1_PD_BASE;
+ hw_info->phy_interrupt_id = CLDMA1_INT;
+ hw_info->hw_mode = MODE_BIT_64;
+ hw_info->ap_ao_base = t7xx_pcie_addr_transfer(pbase->pcie_ext_reg_base,
+ pbase->pcie_dev_reg_trsl_addr, phy_ao_base);
+ hw_info->ap_pdn_base = t7xx_pcie_addr_transfer(pbase->pcie_ext_reg_base,
+ pbase->pcie_dev_reg_trsl_addr, phy_pd_base);
+}
+
+static int t7xx_cldma_default_recv_skb(struct cldma_queue *queue, struct sk_buff *skb)
+{
+ dev_kfree_skb_any(skb);
+ return 0;
+}
+
+int t7xx_cldma_alloc(enum cldma_id hif_id, struct t7xx_pci_dev *t7xx_dev)
+{
+ struct device *dev = &t7xx_dev->pdev->dev;
+ struct cldma_ctrl *md_ctrl;
+
+ md_ctrl = devm_kzalloc(dev, sizeof(*md_ctrl), GFP_KERNEL);
+ if (!md_ctrl)
+ return -ENOMEM;
+
+ md_ctrl->t7xx_dev = t7xx_dev;
+ md_ctrl->dev = dev;
+ md_ctrl->hif_id = hif_id;
+ md_ctrl->recv_skb = t7xx_cldma_default_recv_skb;
+ t7xx_hw_info_init(md_ctrl);
+ t7xx_dev->md->md_ctrl[hif_id] = md_ctrl;
+ return 0;
+}
+
+void t7xx_cldma_hif_hw_init(struct cldma_ctrl *md_ctrl)
+{
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ unsigned long flags;
+
+ spin_lock_irqsave(&md_ctrl->cldma_lock, flags);
+ t7xx_cldma_hw_stop(hw_info, MTK_TX);
+ t7xx_cldma_hw_stop(hw_info, MTK_RX);
+ t7xx_cldma_hw_rx_done(hw_info, EMPTY_STATUS_BITMASK | TXRX_STATUS_BITMASK);
+ t7xx_cldma_hw_tx_done(hw_info, EMPTY_STATUS_BITMASK | TXRX_STATUS_BITMASK);
+ t7xx_cldma_hw_init(hw_info);
+ spin_unlock_irqrestore(&md_ctrl->cldma_lock, flags);
+}
+
+static irqreturn_t t7xx_cldma_isr_handler(int irq, void *data)
+{
+ struct cldma_ctrl *md_ctrl = data;
+ u32 interrupt;
+
+ interrupt = md_ctrl->hw_info.phy_interrupt_id;
+ t7xx_pcie_mac_clear_int(md_ctrl->t7xx_dev, interrupt);
+ t7xx_cldma_irq_work_cb(md_ctrl);
+ t7xx_pcie_mac_clear_int_status(md_ctrl->t7xx_dev, interrupt);
+ t7xx_pcie_mac_set_int(md_ctrl->t7xx_dev, interrupt);
+ return IRQ_HANDLED;
+}
+
+static void t7xx_cldma_destroy_wqs(struct cldma_ctrl *md_ctrl)
+{
+ int i;
+
+ for (i = 0; i < CLDMA_TXQ_NUM; i++) {
+ if (md_ctrl->txq[i].worker) {
+ destroy_workqueue(md_ctrl->txq[i].worker);
+ md_ctrl->txq[i].worker = NULL;
+ }
+ }
+
+ for (i = 0; i < CLDMA_RXQ_NUM; i++) {
+ if (md_ctrl->rxq[i].worker) {
+ destroy_workqueue(md_ctrl->rxq[i].worker);
+ md_ctrl->rxq[i].worker = NULL;
+ }
+ }
+}
+
+/**
+ * t7xx_cldma_init() - Initialize CLDMA.
+ * @md_ctrl: CLDMA context structure.
+ *
+ * Initialize HIF TX/RX queue structure.
+ * Register CLDMA callback ISR with PCIe driver.
+ *
+ * Return:
+ * * 0 - Success.
+ * * -ERROR - Error code from failure sub-initializations.
+ */
+int t7xx_cldma_init(struct cldma_ctrl *md_ctrl)
+{
+ struct t7xx_cldma_hw *hw_info = &md_ctrl->hw_info;
+ int i;
+
+ md_ctrl->txq_active = 0;
+ md_ctrl->rxq_active = 0;
+ md_ctrl->is_late_init = false;
+
+ spin_lock_init(&md_ctrl->cldma_lock);
+
+ for (i = 0; i < CLDMA_TXQ_NUM; i++) {
+ md_cd_queue_struct_init(&md_ctrl->txq[i], md_ctrl, MTK_TX, i);
+ md_ctrl->txq[i].worker =
+ alloc_workqueue("md_hif%d_tx%d_worker",
+ WQ_UNBOUND | WQ_MEM_RECLAIM | (i ? 0 : WQ_HIGHPRI),
+ 1, md_ctrl->hif_id, i);
+ if (!md_ctrl->txq[i].worker)
+ goto err_workqueue;
+
+ INIT_WORK(&md_ctrl->txq[i].cldma_work, t7xx_cldma_tx_done);
+ }
+
+ for (i = 0; i < CLDMA_RXQ_NUM; i++) {
+ md_cd_queue_struct_init(&md_ctrl->rxq[i], md_ctrl, MTK_RX, i);
+ INIT_WORK(&md_ctrl->rxq[i].cldma_work, t7xx_cldma_rx_done);
+
+ md_ctrl->rxq[i].worker = alloc_workqueue("md_hif%d_rx%d_worker",
+ WQ_UNBOUND | WQ_MEM_RECLAIM,
+ 1, md_ctrl->hif_id, i);
+ if (!md_ctrl->rxq[i].worker)
+ goto err_workqueue;
+ }
+
+ t7xx_pcie_mac_clear_int(md_ctrl->t7xx_dev, hw_info->phy_interrupt_id);
+ md_ctrl->t7xx_dev->intr_handler[hw_info->phy_interrupt_id] = t7xx_cldma_isr_handler;
+ md_ctrl->t7xx_dev->intr_thread[hw_info->phy_interrupt_id] = NULL;
+ md_ctrl->t7xx_dev->callback_param[hw_info->phy_interrupt_id] = md_ctrl;
+ t7xx_pcie_mac_clear_int_status(md_ctrl->t7xx_dev, hw_info->phy_interrupt_id);
+ return 0;
+
+err_workqueue:
+ t7xx_cldma_destroy_wqs(md_ctrl);
+ return -ENOMEM;
+}
+
+void t7xx_cldma_switch_cfg(struct cldma_ctrl *md_ctrl)
+{
+ t7xx_cldma_late_release(md_ctrl);
+ t7xx_cldma_late_init(md_ctrl);
+}
+
+void t7xx_cldma_exit(struct cldma_ctrl *md_ctrl)
+{
+ t7xx_cldma_stop(md_ctrl);
+ t7xx_cldma_late_release(md_ctrl);
+ t7xx_cldma_destroy_wqs(md_ctrl);
+}
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_cldma.h b/drivers/net/wwan/t7xx/t7xx_hif_cldma.h
new file mode 100644
index 000000000000..deb239e4f803
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_cldma.h
@@ -0,0 +1,126 @@
+/* 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]>
+ * Ricardo Martinez <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ * Eliot Lee <[email protected]>
+ */
+
+#ifndef __T7XX_HIF_CLDMA_H__
+#define __T7XX_HIF_CLDMA_H__
+
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/dmapool.h>
+#include <linux/pci.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/types.h>
+
+#include "t7xx_cldma.h"
+#include "t7xx_pci.h"
+
+/**
+ * enum cldma_id - Identifiers for CLDMA HW units.
+ * @CLDMA_ID_MD: Modem control channel.
+ * @CLDMA_ID_AP: Application Processor control channel (not used at the moment).
+ * @CLDMA_NUM: Number of CLDMA HW units available.
+ */
+enum cldma_id {
+ CLDMA_ID_MD,
+ CLDMA_ID_AP,
+ CLDMA_NUM
+};
+
+struct cldma_gpd {
+ u8 flags;
+ u8 not_used1;
+ __le16 rx_data_allow_len;
+ __le32 next_gpd_ptr_h;
+ __le32 next_gpd_ptr_l;
+ __le32 data_buff_bd_ptr_h;
+ __le32 data_buff_bd_ptr_l;
+ __le16 data_buff_len;
+ __le16 not_used2;
+};
+
+struct cldma_request {
+ struct cldma_gpd *gpd; /* Virtual address for CPU */
+ dma_addr_t gpd_addr; /* Physical address for DMA */
+ struct sk_buff *skb;
+ dma_addr_t mapped_buff;
+ struct list_head entry;
+};
+
+struct cldma_ring {
+ struct list_head gpd_ring; /* Ring of struct cldma_request */
+ unsigned int length; /* Number of struct cldma_request */
+ int pkt_size;
+};
+
+struct cldma_queue {
+ struct cldma_ctrl *md_ctrl;
+ enum mtk_txrx dir;
+ unsigned int index;
+ struct cldma_ring *tr_ring;
+ struct cldma_request *tr_done;
+ struct cldma_request *rx_refill;
+ struct cldma_request *tx_next;
+ int budget; /* Same as ring buffer size by default */
+ spinlock_t ring_lock;
+ wait_queue_head_t req_wq; /* Only for TX */
+ struct workqueue_struct *worker;
+ struct work_struct cldma_work;
+};
+
+struct cldma_ctrl {
+ enum cldma_id hif_id;
+ struct device *dev;
+ struct t7xx_pci_dev *t7xx_dev;
+ struct cldma_queue txq[CLDMA_TXQ_NUM];
+ struct cldma_queue rxq[CLDMA_RXQ_NUM];
+ unsigned short txq_active;
+ unsigned short rxq_active;
+ unsigned short txq_started;
+ spinlock_t cldma_lock; /* Protects CLDMA structure */
+ /* Assumes T/R GPD/BD/SPD have the same size */
+ struct dma_pool *gpd_dmapool;
+ struct cldma_ring tx_ring[CLDMA_TXQ_NUM];
+ struct cldma_ring rx_ring[CLDMA_RXQ_NUM];
+ struct t7xx_cldma_hw hw_info;
+ bool is_late_init;
+ int (*recv_skb)(struct cldma_queue *queue, struct sk_buff *skb);
+};
+
+#define GPD_FLAGS_HWO BIT(0)
+#define GPD_FLAGS_IOC BIT(7)
+#define GPD_DMAPOOL_ALIGN 16
+
+#define CLDMA_MTU 3584 /* 3.5kB */
+
+int t7xx_cldma_alloc(enum cldma_id hif_id, struct t7xx_pci_dev *t7xx_dev);
+void t7xx_cldma_hif_hw_init(struct cldma_ctrl *md_ctrl);
+int t7xx_cldma_init(struct cldma_ctrl *md_ctrl);
+void t7xx_cldma_exit(struct cldma_ctrl *md_ctrl);
+void t7xx_cldma_switch_cfg(struct cldma_ctrl *md_ctrl);
+void t7xx_cldma_start(struct cldma_ctrl *md_ctrl);
+int t7xx_cldma_stop(struct cldma_ctrl *md_ctrl);
+void t7xx_cldma_reset(struct cldma_ctrl *md_ctrl);
+void t7xx_cldma_set_recv_skb(struct cldma_ctrl *md_ctrl,
+ int (*recv_skb)(struct cldma_queue *queue, struct sk_buff *skb));
+int t7xx_cldma_send_skb(struct cldma_ctrl *md_ctrl, int qno, struct sk_buff *skb);
+void t7xx_cldma_stop_all_qs(struct cldma_ctrl *md_ctrl, enum mtk_txrx tx_rx);
+void t7xx_cldma_clear_all_qs(struct cldma_ctrl *md_ctrl, enum mtk_txrx tx_rx);
+
+#endif /* __T7XX_HIF_CLDMA_H__ */
diff --git a/drivers/net/wwan/t7xx/t7xx_reg.h b/drivers/net/wwan/t7xx/t7xx_reg.h
new file mode 100644
index 000000000000..7dc6c77a59e3
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_reg.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ * Haijun Liu <[email protected]>
+ * Chiranjeevi Rapolu <[email protected]>
+ *
+ * Contributors:
+ * Amir Hanania <[email protected]>
+ * Andy Shevchenko <[email protected]>
+ * Eliot Lee <[email protected]>
+ * Moises Veleta <[email protected]>
+ * Ricardo Martinez <[email protected]>
+ * Sreehari Kancharla <[email protected]>
+ */
+
+#ifndef __T7XX_REG_H__
+#define __T7XX_REG_H__
+
+enum t7xx_int {
+ DPMAIF_INT,
+ CLDMA0_INT,
+ CLDMA1_INT,
+ CLDMA2_INT,
+ MHCCIF_INT,
+ DPMAIF2_INT,
+ SAP_RGU_INT,
+ CLDMA3_INT,
+};
+
+#endif /* __T7XX_REG_H__ */
--
2.25.1
On Fri, May 6, 2022 at 4:16 AM Ricardo Martinez
<[email protected]> wrote:
> Cross Layer DMA (CLDMA) Hardware interface (HIF) enables the control
> path of Host-Modem data transfers. CLDMA HIF layer provides a common
> interface to the Port Layer.
>
> CLDMA manages 8 independent RX/TX physical channels with data flow
> control in HW queues. CLDMA uses ring buffers of General Packet
> Descriptors (GPD) for TX/RX. GPDs can represent multiple or single
> data buffers (DB).
>
> CLDMA HIF initializes GPD rings, registers ISR handlers for CLDMA
> interrupts, and initializes CLDMA HW registers.
>
> CLDMA TX flow:
> 1. Port Layer write
> 2. Get DB address
> 3. Configure GPD
> 4. Triggering processing via HW register write
>
> CLDMA RX flow:
> 1. CLDMA HW sends a RX "done" to host
> 2. Driver starts thread to safely read GPD
> 3. DB is sent to Port layer
> 4. Create a new buffer for GPD ring
>
> Note: This patch does not enable compilation since it has dependencies
> such as t7xx_pcie_mac_clear_int()/t7xx_pcie_mac_set_int() and
> struct t7xx_pci_dev which are added by the core patch.
>
> 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]>