Create a m_can platform framework that peripherial
devices can register to and use common code and register sets.
The peripherial devices may provide read/write and configuration
support of the IP.
Signed-off-by: Dan Murphy <[email protected]>
---
v8 - Added a clean function for the tx_skb, cleaned up skb on BUS_OFF and on xmit
BUSY - https://lore.kernel.org/patchwork/patch/1047980/
v7 - Fixed remaining new checkpatch issues, removed CSR setting, fixed tx hard
start function to return tx_busy, and renamed device callbacks - https://lore.kernel.org/patchwork/patch/1047220/
v6 - Squashed platform patch to this patch for bissectablity, fixed coding style
issues, updated Kconfig help, placed mcan reg offsets back into c file, renamed
priv->skb to priv->tx_skb and cleared perp interrupts at ISR start -
Patch 1 comments - https://lore.kernel.org/patchwork/patch/1042446/
Patch 2 comments - https://lore.kernel.org/patchwork/patch/1042442/
drivers/net/can/m_can/Kconfig | 13 +-
drivers/net/can/m_can/Makefile | 1 +
drivers/net/can/m_can/m_can.c | 717 +++++++++++++------------
drivers/net/can/m_can/m_can.h | 110 ++++
drivers/net/can/m_can/m_can_platform.c | 202 +++++++
5 files changed, 699 insertions(+), 344 deletions(-)
create mode 100644 drivers/net/can/m_can/m_can.h
create mode 100644 drivers/net/can/m_can/m_can_platform.c
diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
index 04f20dd39007..f7119fd72df4 100644
--- a/drivers/net/can/m_can/Kconfig
+++ b/drivers/net/can/m_can/Kconfig
@@ -1,5 +1,14 @@
config CAN_M_CAN
+ tristate "Bosch M_CAN support"
+ ---help---
+ Say Y here if you want support for Bosch M_CAN controller framework.
+ This is common support for devices that embed the Bosch M_CAN IP.
+
+config CAN_M_CAN_PLATFORM
+ tristate "Bosch M_CAN support for io-mapped devices"
depends on HAS_IOMEM
- tristate "Bosch M_CAN devices"
+ depends on CAN_M_CAN
---help---
- Say Y here if you want to support for Bosch M_CAN controller.
+ Say Y here if you want support for IO Mapped Bosch M_CAN controller.
+ This support is for devices that have the Bosch M_CAN controller
+ IP embedded into the device and the IP is IO Mapped to the processor.
diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
index 8bbd7f24f5be..057bbcdb3c74 100644
--- a/drivers/net/can/m_can/Makefile
+++ b/drivers/net/can/m_can/Makefile
@@ -3,3 +3,4 @@
#
obj-$(CONFIG_CAN_M_CAN) += m_can.o
+obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 9b449400376b..f2231fb02525 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1,20 +1,14 @@
-/*
- * CAN bus driver for Bosch M_CAN controller
- *
- * Copyright (C) 2014 Freescale Semiconductor, Inc.
- * Dong Aisheng <[email protected]>
- *
- * Bosch M_CAN user manual can be obtained from:
+// SPDX-License-Identifier: GPL-2.0
+// CAN bus driver for Bosch M_CAN controller
+// Copyright (C) 2014 Freescale Semiconductor, Inc.
+// Dong Aisheng <[email protected]>
+// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
+
+/* Bosch M_CAN user manual can be obtained from:
* http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/
* mcan_users_manual_v302.pdf
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
*/
-#include <linux/clk.h>
-#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
@@ -28,11 +22,7 @@
#include <linux/can/dev.h>
#include <linux/pinctrl/consumer.h>
-/* napi related */
-#define M_CAN_NAPI_WEIGHT 64
-
-/* message ram configuration data length */
-#define MRAM_CFG_LEN 8
+#include "m_can.h"
/* registers definition */
enum m_can_reg {
@@ -86,28 +76,11 @@ enum m_can_reg {
M_CAN_TXEFA = 0xf8,
};
-/* m_can lec values */
-enum m_can_lec_type {
- LEC_NO_ERROR = 0,
- LEC_STUFF_ERROR,
- LEC_FORM_ERROR,
- LEC_ACK_ERROR,
- LEC_BIT1_ERROR,
- LEC_BIT0_ERROR,
- LEC_CRC_ERROR,
- LEC_UNUSED,
-};
+/* napi related */
+#define M_CAN_NAPI_WEIGHT 64
-enum m_can_mram_cfg {
- MRAM_SIDF = 0,
- MRAM_XIDF,
- MRAM_RXF0,
- MRAM_RXF1,
- MRAM_RXB,
- MRAM_TXE,
- MRAM_TXB,
- MRAM_CFG_NUM,
-};
+/* message ram configuration data length */
+#define MRAM_CFG_LEN 8
/* Core Release Register (CREL) */
#define CREL_REL_SHIFT 28
@@ -347,68 +320,72 @@ enum m_can_mram_cfg {
#define TX_EVENT_MM_SHIFT TX_BUF_MM_SHIFT
#define TX_EVENT_MM_MASK (0xff << TX_EVENT_MM_SHIFT)
-/* address offset and element number for each FIFO/Buffer in the Message RAM */
-struct mram_cfg {
- u16 off;
- u8 num;
-};
-
-/* m_can private data structure */
-struct m_can_priv {
- struct can_priv can; /* must be the first member */
- struct napi_struct napi;
- struct net_device *dev;
- struct device *device;
- struct clk *hclk;
- struct clk *cclk;
- void __iomem *base;
- u32 irqstatus;
- int version;
-
- /* message ram configuration */
- void __iomem *mram_base;
- struct mram_cfg mcfg[MRAM_CFG_NUM];
-};
+static u32 m_can_read(struct m_can_priv *priv, enum m_can_reg reg)
+{
+ if (priv->ops->read_reg)
+ return priv->ops->read_reg(priv, reg);
+ else
+ return -EINVAL;
+}
-static inline u32 m_can_read(const struct m_can_priv *priv, enum m_can_reg reg)
+static int m_can_write(struct m_can_priv *priv, enum m_can_reg reg, u32 val)
{
- return readl(priv->base + reg);
+ if (priv->ops->write_reg)
+ return priv->ops->write_reg(priv, reg, val);
+ else
+ return -EINVAL;
}
-static inline void m_can_write(const struct m_can_priv *priv,
- enum m_can_reg reg, u32 val)
+static u32 m_can_fifo_read(struct m_can_priv *priv,
+ u32 fgi, unsigned int offset)
{
- writel(val, priv->base + reg);
+ u32 addr_offset = priv->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE +
+ offset;
+
+ if (priv->ops->read_fifo)
+ return priv->ops->read_fifo(priv, addr_offset);
+ else
+ return -EINVAL;
}
-static inline u32 m_can_fifo_read(const struct m_can_priv *priv,
- u32 fgi, unsigned int offset)
+static u32 m_can_fifo_write(struct m_can_priv *priv,
+ u32 fpi, unsigned int offset, u32 val)
{
- return readl(priv->mram_base + priv->mcfg[MRAM_RXF0].off +
- fgi * RXF0_ELEMENT_SIZE + offset);
+ u32 addr_offset = priv->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE +
+ offset;
+
+ if (priv->ops->write_fifo)
+ return priv->ops->write_fifo(priv, addr_offset, val);
+ else
+ return -EINVAL;
}
-static inline void m_can_fifo_write(const struct m_can_priv *priv,
- u32 fpi, unsigned int offset, u32 val)
+static u32 m_can_fifo_write_no_off(struct m_can_priv *priv,
+ u32 fpi, u32 val)
{
- writel(val, priv->mram_base + priv->mcfg[MRAM_TXB].off +
- fpi * TXB_ELEMENT_SIZE + offset);
+ if (priv->ops->write_fifo)
+ return priv->ops->write_fifo(priv, fpi, val);
+ else
+ return 0;
}
-static inline u32 m_can_txe_fifo_read(const struct m_can_priv *priv,
- u32 fgi,
- u32 offset) {
- return readl(priv->mram_base + priv->mcfg[MRAM_TXE].off +
- fgi * TXE_ELEMENT_SIZE + offset);
+static u32 m_can_txe_fifo_read(struct m_can_priv *priv, u32 fgi, u32 offset)
+{
+ u32 addr_offset = priv->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE +
+ offset;
+
+ if (priv->ops->read_fifo)
+ return priv->ops->read_fifo(priv, addr_offset);
+ else
+ return -EINVAL;
}
-static inline bool m_can_tx_fifo_full(const struct m_can_priv *priv)
+static inline bool m_can_tx_fifo_full(struct m_can_priv *priv)
{
return !!(m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQF);
}
-static inline void m_can_config_endisable(const struct m_can_priv *priv,
- bool enable)
+void m_can_config_endisable(struct m_can_priv *priv, bool enable)
{
u32 cccr = m_can_read(priv, M_CAN_CCCR);
u32 timeout = 10;
@@ -430,7 +407,7 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
while ((m_can_read(priv, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) {
if (timeout == 0) {
- netdev_warn(priv->dev, "Failed to init module\n");
+ netdev_warn(priv->net, "Failed to init module\n");
return;
}
timeout--;
@@ -438,17 +415,29 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
}
}
-static inline void m_can_enable_all_interrupts(const struct m_can_priv *priv)
+static inline void m_can_enable_all_interrupts(struct m_can_priv *priv)
{
/* Only interrupt line 0 is used in this driver */
m_can_write(priv, M_CAN_ILE, ILE_EINT0);
}
-static inline void m_can_disable_all_interrupts(const struct m_can_priv *priv)
+static inline void m_can_disable_all_interrupts(struct m_can_priv *priv)
{
m_can_write(priv, M_CAN_ILE, 0x0);
}
+static void m_can_clean(struct net_device *net)
+{
+ struct m_can_priv *priv = netdev_priv(net);
+
+ if (priv->tx_skb) {
+ net->stats.tx_errors++;
+ dev_kfree_skb(priv->tx_skb);
+ can_free_echo_skb(priv->net, 0);
+ priv->tx_skb = NULL;
+ }
+}
+
static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
{
struct net_device_stats *stats = &dev->stats;
@@ -633,9 +622,12 @@ static int m_can_clk_start(struct m_can_priv *priv)
{
int err;
- err = pm_runtime_get_sync(priv->device);
+ if (priv->pm_clock_support == 0)
+ return 0;
+
+ err = pm_runtime_get_sync(priv->dev);
if (err < 0) {
- pm_runtime_put_noidle(priv->device);
+ pm_runtime_put_noidle(priv->dev);
return err;
}
@@ -644,7 +636,8 @@ static int m_can_clk_start(struct m_can_priv *priv)
static void m_can_clk_stop(struct m_can_priv *priv)
{
- pm_runtime_put_sync(priv->device);
+ if (priv->pm_clock_support)
+ pm_runtime_put_sync(priv->dev);
}
static int m_can_get_berr_counter(const struct net_device *dev,
@@ -811,9 +804,8 @@ static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
return work_done;
}
-static int m_can_poll(struct napi_struct *napi, int quota)
+static int m_can_rx_handler(struct net_device *dev, int quota)
{
- struct net_device *dev = napi->dev;
struct m_can_priv *priv = netdev_priv(dev);
int work_done = 0;
u32 irqstatus, psr;
@@ -831,13 +823,33 @@ static int m_can_poll(struct napi_struct *napi, int quota)
if (irqstatus & IR_RF0N)
work_done += m_can_do_rx_poll(dev, (quota - work_done));
+end:
+ return work_done;
+}
+
+static int m_can_rx_peripherial(struct net_device *dev)
+{
+ struct m_can_priv *priv = netdev_priv(dev);
+
+ m_can_rx_handler(dev, 1);
+
+ m_can_enable_all_interrupts(priv);
+ return 0;
+}
+
+static int m_can_poll(struct napi_struct *napi, int quota)
+{
+ struct net_device *dev = napi->dev;
+ struct m_can_priv *priv = netdev_priv(dev);
+ int work_done;
+
+ work_done = m_can_rx_handler(dev, quota);
if (work_done < quota) {
napi_complete_done(napi, work_done);
m_can_enable_all_interrupts(priv);
}
-end:
return work_done;
}
@@ -894,6 +906,9 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
if (ir & IR_ALL_INT)
m_can_write(priv, M_CAN_IR, ir);
+ if (priv->ops->clear_interrupts)
+ priv->ops->clear_interrupts(priv);
+
/* schedule NAPI in case of
* - rx IRQ
* - state change IRQ
@@ -902,7 +917,10 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
if ((ir & IR_RF0N) || (ir & IR_ERR_ALL_30X)) {
priv->irqstatus = ir;
m_can_disable_all_interrupts(priv);
- napi_schedule(&priv->napi);
+ if (!priv->is_peripherial)
+ napi_schedule(&priv->napi);
+ else
+ m_can_rx_peripherial(dev);
}
if (priv->version == 30) {
@@ -1155,6 +1173,9 @@ static void m_can_chip_config(struct net_device *dev)
m_can_set_bittiming(dev);
m_can_config_endisable(priv, false);
+
+ if (priv->ops->init)
+ priv->ops->init(priv);
}
static void m_can_start(struct net_device *dev)
@@ -1173,6 +1194,7 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
{
switch (mode) {
case CAN_MODE_START:
+ m_can_clean(dev);
m_can_start(dev);
netif_wake_queue(dev);
break;
@@ -1188,20 +1210,17 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
* else it returns the release and step coded as:
* return value = 10 * <release> + 1 * <step>
*/
-static int m_can_check_core_release(void __iomem *m_can_base)
+static int m_can_check_core_release(struct m_can_priv *priv)
{
u32 crel_reg;
u8 rel;
u8 step;
int res;
- struct m_can_priv temp_priv = {
- .base = m_can_base
- };
/* Read Core Release Version and split into version number
* Example: Version 3.2.1 => rel = 3; step = 2; substep = 1;
*/
- crel_reg = m_can_read(&temp_priv, M_CAN_CREL);
+ crel_reg = m_can_read(priv, M_CAN_CREL);
rel = (u8)((crel_reg & CREL_REL_MASK) >> CREL_REL_SHIFT);
step = (u8)((crel_reg & CREL_STEP_MASK) >> CREL_STEP_SHIFT);
@@ -1219,18 +1238,26 @@ static int m_can_check_core_release(void __iomem *m_can_base)
/* Selectable Non ISO support only in version 3.2.x
* This function checks if the bit is writable.
*/
-static bool m_can_niso_supported(const struct m_can_priv *priv)
+static bool m_can_niso_supported(struct m_can_priv *priv)
{
- u32 cccr_reg, cccr_poll;
- int niso_timeout;
+ u32 cccr_reg, cccr_poll = 0;
+ int niso_timeout = -ETIMEDOUT;
+ int i;
m_can_config_endisable(priv, true);
cccr_reg = m_can_read(priv, M_CAN_CCCR);
cccr_reg |= CCCR_NISO;
m_can_write(priv, M_CAN_CCCR, cccr_reg);
- niso_timeout = readl_poll_timeout((priv->base + M_CAN_CCCR), cccr_poll,
- (cccr_poll == cccr_reg), 0, 10);
+ for (i = 0; i <= 10; i++) {
+ cccr_poll = m_can_read(priv, M_CAN_CCCR);
+ if (cccr_poll == cccr_reg) {
+ niso_timeout = 0;
+ break;
+ }
+
+ usleep_range(1, 5);
+ }
/* Clear NISO */
cccr_reg &= ~(CCCR_NISO);
@@ -1242,107 +1269,79 @@ static bool m_can_niso_supported(const struct m_can_priv *priv)
return !niso_timeout;
}
-static int m_can_dev_setup(struct platform_device *pdev, struct net_device *dev,
- void __iomem *addr)
+static int m_can_dev_setup(struct m_can_priv *m_can_dev)
{
- struct m_can_priv *priv;
+ struct net_device *dev = m_can_dev->net;
int m_can_version;
- m_can_version = m_can_check_core_release(addr);
+ m_can_version = m_can_check_core_release(m_can_dev);
/* return if unsupported version */
if (!m_can_version) {
- dev_err(&pdev->dev, "Unsupported version number: %2d",
+ dev_err(m_can_dev->dev, "Unsupported version number: %2d",
m_can_version);
return -EINVAL;
}
- priv = netdev_priv(dev);
- netif_napi_add(dev, &priv->napi, m_can_poll, M_CAN_NAPI_WEIGHT);
+ if (!m_can_dev->is_peripherial)
+ netif_napi_add(dev, &m_can_dev->napi,
+ m_can_poll, M_CAN_NAPI_WEIGHT);
/* Shared properties of all M_CAN versions */
- priv->version = m_can_version;
- priv->dev = dev;
- priv->base = addr;
- priv->can.do_set_mode = m_can_set_mode;
- priv->can.do_get_berr_counter = m_can_get_berr_counter;
+ m_can_dev->version = m_can_version;
+ m_can_dev->can.do_set_mode = m_can_set_mode;
+ m_can_dev->can.do_get_berr_counter = m_can_get_berr_counter;
/* Set M_CAN supported operations */
- priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
+ m_can_dev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_BERR_REPORTING |
CAN_CTRLMODE_FD;
/* Set properties depending on M_CAN version */
- switch (priv->version) {
+ switch (m_can_dev->version) {
case 30:
/* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.x */
can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
- priv->can.bittiming_const = &m_can_bittiming_const_30X;
- priv->can.data_bittiming_const =
- &m_can_data_bittiming_const_30X;
+ m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
+ m_can_dev->bit_timing : &m_can_bittiming_const_30X;
+
+ m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
+ m_can_dev->data_timing :
+ &m_can_data_bittiming_const_30X;
break;
case 31:
/* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.1.x */
can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
- priv->can.bittiming_const = &m_can_bittiming_const_31X;
- priv->can.data_bittiming_const =
- &m_can_data_bittiming_const_31X;
+ m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
+ m_can_dev->bit_timing : &m_can_bittiming_const_31X;
+
+ m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
+ m_can_dev->data_timing :
+ &m_can_data_bittiming_const_31X;
break;
case 32:
- priv->can.bittiming_const = &m_can_bittiming_const_31X;
- priv->can.data_bittiming_const =
- &m_can_data_bittiming_const_31X;
- priv->can.ctrlmode_supported |= (m_can_niso_supported(priv)
+ m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
+ m_can_dev->bit_timing : &m_can_bittiming_const_31X;
+
+ m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
+ m_can_dev->data_timing :
+ &m_can_data_bittiming_const_31X;
+
+ m_can_dev->can.ctrlmode_supported |=
+ (m_can_niso_supported(m_can_dev)
? CAN_CTRLMODE_FD_NON_ISO
: 0);
break;
default:
- dev_err(&pdev->dev, "Unsupported version number: %2d",
- priv->version);
+ dev_err(m_can_dev->dev, "Unsupported version number: %2d",
+ m_can_dev->version);
return -EINVAL;
}
- return 0;
-}
-
-static int m_can_open(struct net_device *dev)
-{
- struct m_can_priv *priv = netdev_priv(dev);
- int err;
-
- err = m_can_clk_start(priv);
- if (err)
- return err;
-
- /* open the can device */
- err = open_candev(dev);
- if (err) {
- netdev_err(dev, "failed to open can device\n");
- goto exit_disable_clks;
- }
-
- /* register interrupt handler */
- err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
- dev);
- if (err < 0) {
- netdev_err(dev, "failed to request interrupt\n");
- goto exit_irq_fail;
- }
-
- /* start the m_can controller */
- m_can_start(dev);
-
- can_led_event(dev, CAN_LED_EVENT_OPEN);
- napi_enable(&priv->napi);
- netif_start_queue(dev);
+ if (m_can_dev->ops->init)
+ m_can_dev->ops->init(m_can_dev);
return 0;
-
-exit_irq_fail:
- close_candev(dev);
-exit_disable_clks:
- m_can_clk_stop(priv);
- return err;
}
static void m_can_stop(struct net_device *dev)
@@ -1361,10 +1360,18 @@ static int m_can_close(struct net_device *dev)
struct m_can_priv *priv = netdev_priv(dev);
netif_stop_queue(dev);
- napi_disable(&priv->napi);
+ if (!priv->is_peripherial)
+ napi_disable(&priv->napi);
m_can_stop(dev);
m_can_clk_stop(priv);
free_irq(dev->irq, dev);
+
+ if (priv->is_peripherial) {
+ priv->tx_skb = NULL;
+ destroy_workqueue(priv->tx_wq);
+ priv->tx_wq = NULL;
+ }
+
close_candev(dev);
can_led_event(dev, CAN_LED_EVENT_STOP);
@@ -1385,18 +1392,15 @@ static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx)
return !!priv->can.echo_skb[next_idx];
}
-static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
- struct net_device *dev)
+static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
{
- struct m_can_priv *priv = netdev_priv(dev);
- struct canfd_frame *cf = (struct canfd_frame *)skb->data;
+ struct canfd_frame *cf = (struct canfd_frame *)priv->tx_skb->data;
+ struct net_device *dev = priv->net;
+ struct sk_buff *skb = priv->tx_skb;
u32 id, cccr, fdflags;
int i;
int putidx;
- if (can_dropped_invalid_skb(dev, skb))
- return NETDEV_TX_OK;
-
/* Generate ID field for TX buffer Element */
/* Common to all supported M_CAN versions */
if (cf->can_id & CAN_EFF_FLAG) {
@@ -1492,14 +1496,117 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
m_can_write(priv, M_CAN_TXBAR, (1 << putidx));
/* stop network queue if fifo full */
- if (m_can_tx_fifo_full(priv) ||
- m_can_next_echo_skb_occupied(dev, putidx))
- netif_stop_queue(dev);
+ if (m_can_tx_fifo_full(priv) ||
+ m_can_next_echo_skb_occupied(dev, putidx))
+ netif_stop_queue(dev);
+ }
+
+ return NETDEV_TX_OK;
+}
+
+static void m_can_tx_work_queue(struct work_struct *ws)
+{
+ struct m_can_priv *priv = container_of(ws, struct m_can_priv,
+ tx_work);
+ netdev_tx_t ret;
+
+ ret = m_can_tx_handler(priv);
+ if (ret == NETDEV_TX_OK)
+ priv->tx_skb = NULL;
+}
+
+static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct m_can_priv *priv = netdev_priv(dev);
+
+ if (can_dropped_invalid_skb(dev, skb))
+ return NETDEV_TX_OK;
+
+ if (priv->is_peripherial) {
+ if (priv->tx_skb) {
+ netdev_err(dev, "hard_xmit called while tx busy\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ if (priv->can.state == CAN_STATE_BUS_OFF) {
+ m_can_clean(dev);
+ } else {
+ priv->tx_skb = skb;
+ netif_stop_queue(priv->net);
+ queue_work(priv->tx_wq, &priv->tx_work);
+ }
+ } else {
+ priv->tx_skb = skb;
+ return m_can_tx_handler(priv);
}
return NETDEV_TX_OK;
}
+static int m_can_open(struct net_device *dev)
+{
+ struct m_can_priv *priv = netdev_priv(dev);
+ int err;
+
+ err = m_can_clk_start(priv);
+ if (err)
+ return err;
+
+ /* open the can device */
+ err = open_candev(dev);
+ if (err) {
+ netdev_err(dev, "failed to open can device\n");
+ goto exit_disable_clks;
+ }
+
+ /* register interrupt handler */
+ if (priv->is_peripherial) {
+ priv->tx_skb = NULL;
+ priv->tx_wq = alloc_workqueue("mcan_wq",
+ WQ_FREEZABLE | WQ_MEM_RECLAIM, 0);
+ if (!priv->tx_wq) {
+ err = -ENOMEM;
+ goto out_wq_fail;
+ }
+
+ INIT_WORK(&priv->tx_work, m_can_tx_work_queue);
+
+ err = request_threaded_irq(dev->irq, NULL, m_can_isr,
+ IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
+ dev->name, dev);
+ } else {
+ err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
+ dev);
+ }
+
+ if (err < 0) {
+ netdev_err(dev, "failed to request interrupt\n");
+ goto exit_irq_fail;
+ }
+
+ /* start the m_can controller */
+ m_can_start(dev);
+
+ can_led_event(dev, CAN_LED_EVENT_OPEN);
+
+ if (!priv->is_peripherial)
+ napi_enable(&priv->napi);
+
+ netif_start_queue(dev);
+
+ return 0;
+
+exit_irq_fail:
+ if (priv->is_peripherial)
+ destroy_workqueue(priv->tx_wq);
+out_wq_fail:
+ close_candev(dev);
+exit_disable_clks:
+ m_can_clk_stop(priv);
+ return err;
+}
+
static const struct net_device_ops m_can_netdev_ops = {
.ndo_open = m_can_open,
.ndo_stop = m_can_close,
@@ -1515,20 +1622,6 @@ static int register_m_can_dev(struct net_device *dev)
return register_candev(dev);
}
-static void m_can_init_ram(struct m_can_priv *priv)
-{
- int end, i, start;
-
- /* initialize the entire Message RAM in use to avoid possible
- * ECC/parity checksum errors when reading an uninitialized buffer
- */
- start = priv->mcfg[MRAM_SIDF].off;
- end = priv->mcfg[MRAM_TXB].off +
- priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
- for (i = start; i < end; i += 4)
- writel(0x0, priv->mram_base + i);
-}
-
static void m_can_of_parse_mram(struct m_can_priv *priv,
const u32 *mram_config_vals)
{
@@ -1556,9 +1649,8 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
priv->mcfg[MRAM_TXB].num = mram_config_vals[7] &
(TXBC_NDTB_MASK >> TXBC_NDTB_SHIFT);
- dev_dbg(priv->device,
- "mram_base %p sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
- priv->mram_base,
+ dev_dbg(priv->dev,
+ "sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
priv->mcfg[MRAM_SIDF].off, priv->mcfg[MRAM_SIDF].num,
priv->mcfg[MRAM_XIDF].off, priv->mcfg[MRAM_XIDF].num,
priv->mcfg[MRAM_RXF0].off, priv->mcfg[MRAM_RXF0].num,
@@ -1566,63 +1658,55 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
priv->mcfg[MRAM_RXB].off, priv->mcfg[MRAM_RXB].num,
priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num,
priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num);
-
- m_can_init_ram(priv);
}
-static int m_can_plat_probe(struct platform_device *pdev)
+void m_can_init_ram(struct m_can_priv *priv)
{
- struct net_device *dev;
- struct m_can_priv *priv;
- struct resource *res;
- void __iomem *addr;
- void __iomem *mram_addr;
- struct clk *hclk, *cclk;
- int irq, ret;
- struct device_node *np;
- u32 mram_config_vals[MRAM_CFG_LEN];
- u32 tx_fifo_size;
-
- np = pdev->dev.of_node;
+ int end, i, start;
- hclk = devm_clk_get(&pdev->dev, "hclk");
- cclk = devm_clk_get(&pdev->dev, "cclk");
+ /* initialize the entire Message RAM in use to avoid possible
+ * ECC/parity checksum errors when reading an uninitialized buffer
+ */
+ start = priv->mcfg[MRAM_SIDF].off;
+ end = priv->mcfg[MRAM_TXB].off +
+ priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
- if (IS_ERR(hclk) || IS_ERR(cclk)) {
- dev_err(&pdev->dev, "no clock found\n");
- ret = -ENODEV;
- goto failed_ret;
- }
+ for (i = start; i < end; i += 4)
+ m_can_fifo_write_no_off(priv, i, 0x0);
+}
+EXPORT_SYMBOL_GPL(m_can_init_ram);
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
- addr = devm_ioremap_resource(&pdev->dev, res);
- irq = platform_get_irq_byname(pdev, "int0");
+int m_can_class_get_clocks(struct m_can_priv *m_can_dev)
+{
+ int ret = 0;
- if (IS_ERR(addr) || irq < 0) {
- ret = -EINVAL;
- goto failed_ret;
- }
+ m_can_dev->hclk = devm_clk_get(m_can_dev->dev, "hclk");
+ m_can_dev->cclk = devm_clk_get(m_can_dev->dev, "cclk");
- /* message ram could be shared */
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
- if (!res) {
+ if (IS_ERR(m_can_dev->cclk)) {
+ dev_err(m_can_dev->dev, "no clock found\n");
ret = -ENODEV;
- goto failed_ret;
}
- mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
- if (!mram_addr) {
- ret = -ENOMEM;
- goto failed_ret;
- }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(m_can_class_get_clocks);
- /* get message ram configuration */
- ret = of_property_read_u32_array(np, "bosch,mram-cfg",
- mram_config_vals,
- sizeof(mram_config_vals) / 4);
+struct m_can_priv *m_can_class_allocate_dev(struct device *dev)
+{
+ struct m_can_priv *class_dev = NULL;
+ u32 mram_config_vals[MRAM_CFG_LEN];
+ struct net_device *net_dev;
+ u32 tx_fifo_size;
+ int ret;
+
+ ret = fwnode_property_read_u32_array(dev_fwnode(dev),
+ "bosch,mram-cfg",
+ mram_config_vals,
+ sizeof(mram_config_vals) / 4);
if (ret) {
- dev_err(&pdev->dev, "Could not get Message RAM configuration.");
- goto failed_ret;
+ dev_err(dev, "Could not get Message RAM configuration.");
+ goto out;
}
/* Get TX FIFO size
@@ -1631,66 +1715,74 @@ static int m_can_plat_probe(struct platform_device *pdev)
tx_fifo_size = mram_config_vals[7];
/* allocate the m_can device */
- dev = alloc_candev(sizeof(*priv), tx_fifo_size);
- if (!dev) {
- ret = -ENOMEM;
- goto failed_ret;
+ net_dev = alloc_candev(sizeof(*class_dev), tx_fifo_size);
+ if (!net_dev) {
+ dev_err(dev, "Failed to allocate CAN device");
+ goto out;
+ }
+
+ class_dev = netdev_priv(net_dev);
+ if (!class_dev) {
+ dev_err(dev, "Failed to init netdev private");
+ goto out;
}
- priv = netdev_priv(dev);
- dev->irq = irq;
- priv->device = &pdev->dev;
- priv->hclk = hclk;
- priv->cclk = cclk;
- priv->can.clock.freq = clk_get_rate(cclk);
- priv->mram_base = mram_addr;
+ class_dev->net = net_dev;
+ class_dev->dev = dev;
+ SET_NETDEV_DEV(net_dev, dev);
- platform_set_drvdata(pdev, dev);
- SET_NETDEV_DEV(dev, &pdev->dev);
+ m_can_of_parse_mram(class_dev, mram_config_vals);
+out:
+ return class_dev;
+}
+EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);
- /* Enable clocks. Necessary to read Core Release in order to determine
- * M_CAN version
- */
- pm_runtime_enable(&pdev->dev);
- ret = m_can_clk_start(priv);
- if (ret)
- goto pm_runtime_fail;
+int m_can_class_register(struct m_can_priv *m_can_dev)
+{
+ int ret;
+
+ if (m_can_dev->pm_clock_support) {
+ pm_runtime_enable(m_can_dev->dev);
+ ret = m_can_clk_start(m_can_dev);
+ if (ret)
+ goto pm_runtime_fail;
+ }
- ret = m_can_dev_setup(pdev, dev, addr);
+ ret = m_can_dev_setup(m_can_dev);
if (ret)
goto clk_disable;
- ret = register_m_can_dev(dev);
+ ret = register_m_can_dev(m_can_dev->net);
if (ret) {
- dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
- KBUILD_MODNAME, ret);
+ dev_err(m_can_dev->dev, "registering %s failed (err=%d)\n",
+ m_can_dev->net->name, ret);
goto clk_disable;
}
- m_can_of_parse_mram(priv, mram_config_vals);
+ devm_can_led_init(m_can_dev->net);
- devm_can_led_init(dev);
+ of_can_transceiver(m_can_dev->net);
- of_can_transceiver(dev);
-
- dev_info(&pdev->dev, "%s device registered (irq=%d, version=%d)\n",
- KBUILD_MODNAME, dev->irq, priv->version);
+ dev_info(m_can_dev->dev, "%s device registered (irq=%d, version=%d)\n",
+ KBUILD_MODNAME, m_can_dev->net->irq, m_can_dev->version);
/* Probe finished
* Stop clocks. They will be reactivated once the M_CAN device is opened
*/
clk_disable:
- m_can_clk_stop(priv);
+ m_can_clk_stop(m_can_dev);
pm_runtime_fail:
if (ret) {
- pm_runtime_disable(&pdev->dev);
- free_candev(dev);
+ if (m_can_dev->pm_clock_support)
+ pm_runtime_disable(m_can_dev->dev);
+ free_candev(m_can_dev->net);
}
-failed_ret:
+
return ret;
}
+EXPORT_SYMBOL_GPL(m_can_class_register);
-static __maybe_unused int m_can_suspend(struct device *dev)
+int m_can_class_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct m_can_priv *priv = netdev_priv(ndev);
@@ -1708,8 +1800,9 @@ static __maybe_unused int m_can_suspend(struct device *dev)
return 0;
}
+EXPORT_SYMBOL_GPL(m_can_class_suspend);
-static __maybe_unused int m_can_resume(struct device *dev)
+int m_can_class_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct m_can_priv *priv = netdev_priv(ndev);
@@ -1733,79 +1826,19 @@ static __maybe_unused int m_can_resume(struct device *dev)
return 0;
}
+EXPORT_SYMBOL_GPL(m_can_class_resume);
-static void unregister_m_can_dev(struct net_device *dev)
-{
- unregister_candev(dev);
-}
-
-static int m_can_plat_remove(struct platform_device *pdev)
-{
- struct net_device *dev = platform_get_drvdata(pdev);
-
- unregister_m_can_dev(dev);
-
- pm_runtime_disable(&pdev->dev);
-
- platform_set_drvdata(pdev, NULL);
-
- free_candev(dev);
-
- return 0;
-}
-
-static int __maybe_unused m_can_runtime_suspend(struct device *dev)
+void m_can_class_unregister(struct m_can_priv *m_can_dev)
{
- struct net_device *ndev = dev_get_drvdata(dev);
- struct m_can_priv *priv = netdev_priv(ndev);
+ unregister_candev(m_can_dev->net);
- clk_disable_unprepare(priv->cclk);
- clk_disable_unprepare(priv->hclk);
+ m_can_clk_stop(m_can_dev);
- return 0;
+ free_candev(m_can_dev->net);
}
-
-static int __maybe_unused m_can_runtime_resume(struct device *dev)
-{
- struct net_device *ndev = dev_get_drvdata(dev);
- struct m_can_priv *priv = netdev_priv(ndev);
- int err;
-
- err = clk_prepare_enable(priv->hclk);
- if (err)
- return err;
-
- err = clk_prepare_enable(priv->cclk);
- if (err)
- clk_disable_unprepare(priv->hclk);
-
- return err;
-}
-
-static const struct dev_pm_ops m_can_pmops = {
- SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
- m_can_runtime_resume, NULL)
- SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
-};
-
-static const struct of_device_id m_can_of_table[] = {
- { .compatible = "bosch,m_can", .data = NULL },
- { /* sentinel */ },
-};
-MODULE_DEVICE_TABLE(of, m_can_of_table);
-
-static struct platform_driver m_can_plat_driver = {
- .driver = {
- .name = KBUILD_MODNAME,
- .of_match_table = m_can_of_table,
- .pm = &m_can_pmops,
- },
- .probe = m_can_plat_probe,
- .remove = m_can_plat_remove,
-};
-
-module_platform_driver(m_can_plat_driver);
+EXPORT_SYMBOL_GPL(m_can_class_unregister);
MODULE_AUTHOR("Dong Aisheng <[email protected]>");
+MODULE_AUTHOR("Dan Murphy <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller");
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
new file mode 100644
index 000000000000..b60f27dd9f33
--- /dev/null
+++ b/drivers/net/can/m_can/m_can.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* CAN bus driver for Bosch M_CAN controller
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#ifndef _CAN_M_CAN_H_
+#define _CAN_M_CAN_H_
+
+#include <linux/can/core.h>
+#include <linux/can/led.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/freezer.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/iopoll.h>
+#include <linux/can/dev.h>
+#include <linux/pinctrl/consumer.h>
+
+/* m_can lec values */
+enum m_can_lec_type {
+ LEC_NO_ERROR = 0,
+ LEC_STUFF_ERROR,
+ LEC_FORM_ERROR,
+ LEC_ACK_ERROR,
+ LEC_BIT1_ERROR,
+ LEC_BIT0_ERROR,
+ LEC_CRC_ERROR,
+ LEC_UNUSED,
+};
+
+enum m_can_mram_cfg {
+ MRAM_SIDF = 0,
+ MRAM_XIDF,
+ MRAM_RXF0,
+ MRAM_RXF1,
+ MRAM_RXB,
+ MRAM_TXE,
+ MRAM_TXB,
+ MRAM_CFG_NUM,
+};
+
+/* address offset and element number for each FIFO/Buffer in the Message RAM */
+struct mram_cfg {
+ u16 off;
+ u8 num;
+};
+
+struct m_can_priv;
+struct m_can_ops {
+ /* Device specific call backs */
+ int (*clear_interrupts)(struct m_can_priv *m_can_class);
+ u32 (*read_reg)(struct m_can_priv *m_can_class, int reg);
+ int (*write_reg)(struct m_can_priv *m_can_class, int reg, int val);
+ u32 (*read_fifo)(struct m_can_priv *m_can_class, int addr_offset);
+ int (*write_fifo)(struct m_can_priv *m_can_class, int addr_offset,
+ int val);
+ int (*init)(struct m_can_priv *m_can_class);
+};
+
+struct m_can_priv {
+ struct can_priv can;
+ struct napi_struct napi;
+ struct net_device *net;
+ struct device *dev;
+ struct clk *hclk;
+ struct clk *cclk;
+
+ struct workqueue_struct *tx_wq;
+ struct work_struct tx_work;
+ struct sk_buff *tx_skb;
+
+ struct can_bittiming_const *bit_timing;
+ struct can_bittiming_const *data_timing;
+
+ struct m_can_ops *ops;
+
+ void *device_data;
+
+ int version;
+ int freq;
+ u32 irqstatus;
+
+ int pm_clock_support;
+ int is_peripherial;
+
+ struct mram_cfg mcfg[MRAM_CFG_NUM];
+};
+
+struct m_can_priv *m_can_class_allocate_dev(struct device *dev);
+int m_can_class_register(struct m_can_priv *m_can_dev);
+void m_can_class_unregister(struct m_can_priv *m_can_dev);
+int m_can_class_get_clocks(struct m_can_priv *m_can_dev);
+void m_can_init_ram(struct m_can_priv *priv);
+void m_can_config_endisable(struct m_can_priv *priv, bool enable);
+
+int m_can_class_suspend(struct device *dev);
+int m_can_class_resume(struct device *dev);
+#endif /* _CAN_M_H_ */
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
new file mode 100644
index 000000000000..b02d49f9ee4c
--- /dev/null
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0
+// IOMapped CAN bus driver for Bosch M_CAN controller
+// Copyright (C) 2014 Freescale Semiconductor, Inc.
+// Dong Aisheng <[email protected]>
+//
+// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
+
+#include <linux/platform_device.h>
+
+#include "m_can.h"
+
+struct m_can_plat_priv {
+ void __iomem *base;
+ void __iomem *mram_base;
+};
+
+static u32 iomap_read_reg(struct m_can_priv *cdev, int reg)
+{
+ struct m_can_plat_priv *priv =
+ (struct m_can_plat_priv *)cdev->device_data;
+
+ return readl(priv->base + reg);
+}
+
+static u32 iomap_read_fifo(struct m_can_priv *cdev, int offset)
+{
+ struct m_can_plat_priv *priv =
+ (struct m_can_plat_priv *)cdev->device_data;
+
+ return readl(priv->mram_base + offset);
+}
+
+static int iomap_write_reg(struct m_can_priv *cdev, int reg, int val)
+{
+ struct m_can_plat_priv *priv =
+ (struct m_can_plat_priv *)cdev->device_data;
+
+ writel(val, priv->base + reg);
+
+ return 0;
+}
+
+static int iomap_write_fifo(struct m_can_priv *cdev, int offset, int val)
+{
+ struct m_can_plat_priv *priv =
+ (struct m_can_plat_priv *)cdev->device_data;
+
+ writel(val, priv->mram_base + offset);
+
+ return 0;
+}
+
+static struct m_can_ops m_can_plat_ops = {
+ .read_reg = iomap_read_reg,
+ .write_reg = iomap_write_reg,
+ .write_fifo = iomap_write_fifo,
+ .read_fifo = iomap_read_fifo,
+};
+
+static int m_can_plat_probe(struct platform_device *pdev)
+{
+ struct m_can_priv *mcan_class;
+ struct m_can_plat_priv *priv;
+ struct resource *res;
+ void __iomem *addr;
+ void __iomem *mram_addr;
+ int irq, ret = 0;
+
+ mcan_class = m_can_class_allocate_dev(&pdev->dev);
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ mcan_class->device_data = priv;
+
+ m_can_class_get_clocks(mcan_class);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
+ addr = devm_ioremap_resource(&pdev->dev, res);
+ irq = platform_get_irq_byname(pdev, "int0");
+ if (IS_ERR(addr) || irq < 0) {
+ ret = -EINVAL;
+ goto failed_ret;
+ }
+
+ /* message ram could be shared */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
+ if (!res) {
+ ret = -ENODEV;
+ goto failed_ret;
+ }
+
+ mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!mram_addr) {
+ ret = -ENOMEM;
+ goto failed_ret;
+ }
+
+ priv->base = addr;
+ priv->mram_base = mram_addr;
+
+ mcan_class->net->irq = irq;
+ mcan_class->pm_clock_support = 1;
+ mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk);
+ mcan_class->dev = &pdev->dev;
+
+ mcan_class->ops = &m_can_plat_ops;
+
+ mcan_class->is_peripherial = false;
+
+ platform_set_drvdata(pdev, mcan_class->dev);
+
+ m_can_init_ram(mcan_class);
+
+ ret = m_can_class_register(mcan_class);
+
+failed_ret:
+ return ret;
+}
+
+static __maybe_unused int m_can_suspend(struct device *dev)
+{
+ return m_can_class_suspend(dev);
+}
+
+static __maybe_unused int m_can_resume(struct device *dev)
+{
+ return m_can_class_resume(dev);
+}
+
+static int m_can_plat_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct m_can_priv *mcan_class = netdev_priv(dev);
+
+ m_can_class_unregister(mcan_class);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static int __maybe_unused m_can_runtime_suspend(struct device *dev)
+{
+ struct net_device *ndev = dev_get_drvdata(dev);
+ struct m_can_priv *mcan_class = netdev_priv(ndev);
+
+ m_can_class_suspend(dev);
+
+ clk_disable_unprepare(mcan_class->cclk);
+ clk_disable_unprepare(mcan_class->hclk);
+
+ return 0;
+}
+
+static int __maybe_unused m_can_runtime_resume(struct device *dev)
+{
+ struct net_device *ndev = dev_get_drvdata(dev);
+ struct m_can_priv *mcan_class = netdev_priv(ndev);
+ int err;
+
+ err = clk_prepare_enable(mcan_class->hclk);
+ if (err)
+ return err;
+
+ err = clk_prepare_enable(mcan_class->cclk);
+ if (err)
+ clk_disable_unprepare(mcan_class->hclk);
+
+ m_can_class_resume(dev);
+
+ return err;
+}
+
+static const struct dev_pm_ops m_can_pmops = {
+ SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
+ m_can_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
+};
+
+static const struct of_device_id m_can_of_table[] = {
+ { .compatible = "bosch,m_can", .data = NULL },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, m_can_of_table);
+
+static struct platform_driver m_can_plat_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = m_can_of_table,
+ .pm = &m_can_pmops,
+ },
+ .probe = m_can_plat_probe,
+ .remove = m_can_plat_remove,
+};
+
+module_platform_driver(m_can_plat_driver);
+
+MODULE_AUTHOR("Dong Aisheng <[email protected]>");
+MODULE_AUTHOR("Dan Murphy <[email protected]>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("M_CAN driver for IO Mapped Bosch controllers");
--
2.20.1.390.gb5101f9297
DT binding documentation for TI TCAN4x5x driver.
Signed-off-by: Dan Murphy <[email protected]>
---
v8 - No Changes - https://lore.kernel.org/patchwork/patch/1047981/
v7 - Made device state optional - https://lore.kernel.org/patchwork/patch/1047218/
v6 - No changes - https://lore.kernel.org/patchwork/patch/1042445/
.../devicetree/bindings/net/can/tcan4x5x.txt | 37 +++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/can/tcan4x5x.txt
diff --git a/Documentation/devicetree/bindings/net/can/tcan4x5x.txt b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
new file mode 100644
index 000000000000..c388f7d9feb1
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
@@ -0,0 +1,37 @@
+Texas Instruments TCAN4x5x CAN Controller
+================================================
+
+This file provides device node information for the TCAN4x5x interface contains.
+
+Required properties:
+ - compatible: "ti,tcan4x5x"
+ - reg: 0
+ - #address-cells: 1
+ - #size-cells: 0
+ - spi-max-frequency: Maximum frequency of the SPI bus the chip can
+ operate at should be less than or equal to 18 MHz.
+ - data-ready-gpios: Interrupt GPIO for data and error reporting.
+ - device-wake-gpios: Wake up GPIO to wake up the TCAN device.
+
+See Documentation/devicetree/bindings/net/can/m_can.txt for additional
+required property details.
+
+Optional properties:
+ - reset-gpios: Hardwired output GPIO. If not defined then software
+ reset.
+ - device-state-gpios: Input GPIO that indicates if the device is in
+ a sleep state or if the device is active.
+
+Example:
+tcan4x5x: tcan4x5x@0 {
+ compatible = "ti,tcan4x5x";
+ reg = <0>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ spi-max-frequency = <10000000>;
+ bosch,mram-cfg = <0x0 0 0 32 0 0 1 1>;
+ data-ready-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
+ device-state-gpios = <&gpio3 21 GPIO_ACTIVE_HIGH>;
+ device-wake-gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>;
+ reset-gpios = <&gpio1 27 GPIO_ACTIVE_LOW>;
+};
--
2.20.1.390.gb5101f9297
Rename the common m_can_priv class structure to
m_can_classdev as this is more descriptive.
Signed-off-by: Dan Murphy <[email protected]>
---
v8 - Made additional changes on new code to make priv->cdev, and updated the
header file class_dev variable to be consistent. - https://lore.kernel.org/patchwork/patch/1047979/
v7 - Fixed remaining checkpatch issues, renamed priv to cdev - https://lore.kernel.org/patchwork/patch/1047219/
v6 - No changes only rebase changes possibly can squash into the first patch -
https://lore.kernel.org/patchwork/patch/1042444/
drivers/net/can/m_can/m_can.c | 536 ++++++++++++-------------
drivers/net/can/m_can/m_can.h | 28 +-
drivers/net/can/m_can/m_can_platform.c | 16 +-
3 files changed, 290 insertions(+), 290 deletions(-)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index f2231fb02525..760f19f62aac 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -320,94 +320,94 @@ enum m_can_reg {
#define TX_EVENT_MM_SHIFT TX_BUF_MM_SHIFT
#define TX_EVENT_MM_MASK (0xff << TX_EVENT_MM_SHIFT)
-static u32 m_can_read(struct m_can_priv *priv, enum m_can_reg reg)
+static u32 m_can_read(struct m_can_classdev *cdev, enum m_can_reg reg)
{
- if (priv->ops->read_reg)
- return priv->ops->read_reg(priv, reg);
+ if (cdev->ops->read_reg)
+ return cdev->ops->read_reg(cdev, reg);
else
return -EINVAL;
}
-static int m_can_write(struct m_can_priv *priv, enum m_can_reg reg, u32 val)
+static int m_can_write(struct m_can_classdev *cdev, enum m_can_reg reg, u32 val)
{
- if (priv->ops->write_reg)
- return priv->ops->write_reg(priv, reg, val);
+ if (cdev->ops->write_reg)
+ return cdev->ops->write_reg(cdev, reg, val);
else
return -EINVAL;
}
-static u32 m_can_fifo_read(struct m_can_priv *priv,
+static u32 m_can_fifo_read(struct m_can_classdev *cdev,
u32 fgi, unsigned int offset)
{
- u32 addr_offset = priv->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE +
+ u32 addr_offset = cdev->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE +
offset;
- if (priv->ops->read_fifo)
- return priv->ops->read_fifo(priv, addr_offset);
+ if (cdev->ops->read_fifo)
+ return cdev->ops->read_fifo(cdev, addr_offset);
else
return -EINVAL;
}
-static u32 m_can_fifo_write(struct m_can_priv *priv,
+static u32 m_can_fifo_write(struct m_can_classdev *cdev,
u32 fpi, unsigned int offset, u32 val)
{
- u32 addr_offset = priv->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE +
+ u32 addr_offset = cdev->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE +
offset;
- if (priv->ops->write_fifo)
- return priv->ops->write_fifo(priv, addr_offset, val);
+ if (cdev->ops->write_fifo)
+ return cdev->ops->write_fifo(cdev, addr_offset, val);
else
return -EINVAL;
}
-static u32 m_can_fifo_write_no_off(struct m_can_priv *priv,
+static u32 m_can_fifo_write_no_off(struct m_can_classdev *cdev,
u32 fpi, u32 val)
{
- if (priv->ops->write_fifo)
- return priv->ops->write_fifo(priv, fpi, val);
+ if (cdev->ops->write_fifo)
+ return cdev->ops->write_fifo(cdev, fpi, val);
else
return 0;
}
-static u32 m_can_txe_fifo_read(struct m_can_priv *priv, u32 fgi, u32 offset)
+static u32 m_can_txe_fifo_read(struct m_can_classdev *cdev, u32 fgi, u32 offset)
{
- u32 addr_offset = priv->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE +
+ u32 addr_offset = cdev->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE +
offset;
- if (priv->ops->read_fifo)
- return priv->ops->read_fifo(priv, addr_offset);
+ if (cdev->ops->read_fifo)
+ return cdev->ops->read_fifo(cdev, addr_offset);
else
return -EINVAL;
}
-static inline bool m_can_tx_fifo_full(struct m_can_priv *priv)
+static inline bool m_can_tx_fifo_full(struct m_can_classdev *cdev)
{
- return !!(m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQF);
+ return !!(m_can_read(cdev, M_CAN_TXFQS) & TXFQS_TFQF);
}
-void m_can_config_endisable(struct m_can_priv *priv, bool enable)
+void m_can_config_endisable(struct m_can_classdev *cdev, bool enable)
{
- u32 cccr = m_can_read(priv, M_CAN_CCCR);
+ u32 cccr = m_can_read(cdev, M_CAN_CCCR);
u32 timeout = 10;
u32 val = 0;
if (enable) {
/* enable m_can configuration */
- m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT);
+ m_can_write(cdev, M_CAN_CCCR, cccr | CCCR_INIT);
udelay(5);
/* CCCR.CCE can only be set/reset while CCCR.INIT = '1' */
- m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT | CCCR_CCE);
+ m_can_write(cdev, M_CAN_CCCR, cccr | CCCR_INIT | CCCR_CCE);
} else {
- m_can_write(priv, M_CAN_CCCR, cccr & ~(CCCR_INIT | CCCR_CCE));
+ m_can_write(cdev, M_CAN_CCCR, cccr & ~(CCCR_INIT | CCCR_CCE));
}
/* there's a delay for module initialization */
if (enable)
val = CCCR_INIT | CCCR_CCE;
- while ((m_can_read(priv, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) {
+ while ((m_can_read(cdev, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) {
if (timeout == 0) {
- netdev_warn(priv->net, "Failed to init module\n");
+ netdev_warn(cdev->net, "Failed to init module\n");
return;
}
timeout--;
@@ -415,33 +415,33 @@ void m_can_config_endisable(struct m_can_priv *priv, bool enable)
}
}
-static inline void m_can_enable_all_interrupts(struct m_can_priv *priv)
+static inline void m_can_enable_all_interrupts(struct m_can_classdev *cdev)
{
/* Only interrupt line 0 is used in this driver */
- m_can_write(priv, M_CAN_ILE, ILE_EINT0);
+ m_can_write(cdev, M_CAN_ILE, ILE_EINT0);
}
-static inline void m_can_disable_all_interrupts(struct m_can_priv *priv)
+static inline void m_can_disable_all_interrupts(struct m_can_classdev *cdev)
{
- m_can_write(priv, M_CAN_ILE, 0x0);
+ m_can_write(cdev, M_CAN_ILE, 0x0);
}
static void m_can_clean(struct net_device *net)
{
- struct m_can_priv *priv = netdev_priv(net);
+ struct m_can_classdev *cdev = netdev_priv(net);
- if (priv->tx_skb) {
+ if (cdev->tx_skb) {
net->stats.tx_errors++;
- dev_kfree_skb(priv->tx_skb);
- can_free_echo_skb(priv->net, 0);
- priv->tx_skb = NULL;
+ dev_kfree_skb(cdev->tx_skb);
+ can_free_echo_skb(cdev->net, 0);
+ cdev->tx_skb = NULL;
}
}
static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
{
struct net_device_stats *stats = &dev->stats;
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
struct canfd_frame *cf;
struct sk_buff *skb;
u32 id, fgi, dlc;
@@ -449,7 +449,7 @@ static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
/* calculate the fifo get index for where to read data */
fgi = (rxfs & RXFS_FGI_MASK) >> RXFS_FGI_SHIFT;
- dlc = m_can_fifo_read(priv, fgi, M_CAN_FIFO_DLC);
+ dlc = m_can_fifo_read(cdev, fgi, M_CAN_FIFO_DLC);
if (dlc & RX_BUF_FDF)
skb = alloc_canfd_skb(dev, &cf);
else
@@ -464,7 +464,7 @@ static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
else
cf->len = get_can_dlc((dlc >> 16) & 0x0F);
- id = m_can_fifo_read(priv, fgi, M_CAN_FIFO_ID);
+ id = m_can_fifo_read(cdev, fgi, M_CAN_FIFO_ID);
if (id & RX_BUF_XTD)
cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
@@ -483,12 +483,12 @@ static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
for (i = 0; i < cf->len; i += 4)
*(u32 *)(cf->data + i) =
- m_can_fifo_read(priv, fgi,
+ m_can_fifo_read(cdev, fgi,
M_CAN_FIFO_DATA(i / 4));
}
/* acknowledge rx fifo 0 */
- m_can_write(priv, M_CAN_RXF0A, fgi);
+ m_can_write(cdev, M_CAN_RXF0A, fgi);
stats->rx_packets++;
stats->rx_bytes += cf->len;
@@ -498,11 +498,11 @@ static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
static int m_can_do_rx_poll(struct net_device *dev, int quota)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
u32 pkts = 0;
u32 rxfs;
- rxfs = m_can_read(priv, M_CAN_RXF0S);
+ rxfs = m_can_read(cdev, M_CAN_RXF0S);
if (!(rxfs & RXFS_FFL_MASK)) {
netdev_dbg(dev, "no messages in fifo0\n");
return 0;
@@ -516,7 +516,7 @@ static int m_can_do_rx_poll(struct net_device *dev, int quota)
quota--;
pkts++;
- rxfs = m_can_read(priv, M_CAN_RXF0S);
+ rxfs = m_can_read(cdev, M_CAN_RXF0S);
}
if (pkts)
@@ -551,12 +551,12 @@ static int m_can_handle_lost_msg(struct net_device *dev)
static int m_can_handle_lec_err(struct net_device *dev,
enum m_can_lec_type lec_type)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
- priv->can.can_stats.bus_error++;
+ cdev->can.can_stats.bus_error++;
stats->rx_errors++;
/* propagate the error condition to the CAN stack */
@@ -608,51 +608,51 @@ static int m_can_handle_lec_err(struct net_device *dev,
static int __m_can_get_berr_counter(const struct net_device *dev,
struct can_berr_counter *bec)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
unsigned int ecr;
- ecr = m_can_read(priv, M_CAN_ECR);
+ ecr = m_can_read(cdev, M_CAN_ECR);
bec->rxerr = (ecr & ECR_REC_MASK) >> ECR_REC_SHIFT;
bec->txerr = (ecr & ECR_TEC_MASK) >> ECR_TEC_SHIFT;
return 0;
}
-static int m_can_clk_start(struct m_can_priv *priv)
+static int m_can_clk_start(struct m_can_classdev *cdev)
{
int err;
- if (priv->pm_clock_support == 0)
+ if (cdev->pm_clock_support == 0)
return 0;
- err = pm_runtime_get_sync(priv->dev);
+ err = pm_runtime_get_sync(cdev->dev);
if (err < 0) {
- pm_runtime_put_noidle(priv->dev);
+ pm_runtime_put_noidle(cdev->dev);
return err;
}
return 0;
}
-static void m_can_clk_stop(struct m_can_priv *priv)
+static void m_can_clk_stop(struct m_can_classdev *cdev)
{
- if (priv->pm_clock_support)
- pm_runtime_put_sync(priv->dev);
+ if (cdev->pm_clock_support)
+ pm_runtime_put_sync(cdev->dev);
}
static int m_can_get_berr_counter(const struct net_device *dev,
struct can_berr_counter *bec)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
int err;
- err = m_can_clk_start(priv);
+ err = m_can_clk_start(cdev);
if (err)
return err;
__m_can_get_berr_counter(dev, bec);
- m_can_clk_stop(priv);
+ m_can_clk_stop(cdev);
return 0;
}
@@ -660,7 +660,7 @@ static int m_can_get_berr_counter(const struct net_device *dev,
static int m_can_handle_state_change(struct net_device *dev,
enum can_state new_state)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
@@ -670,19 +670,19 @@ static int m_can_handle_state_change(struct net_device *dev,
switch (new_state) {
case CAN_STATE_ERROR_ACTIVE:
/* error warning state */
- priv->can.can_stats.error_warning++;
- priv->can.state = CAN_STATE_ERROR_WARNING;
+ cdev->can.can_stats.error_warning++;
+ cdev->can.state = CAN_STATE_ERROR_WARNING;
break;
case CAN_STATE_ERROR_PASSIVE:
/* error passive state */
- priv->can.can_stats.error_passive++;
- priv->can.state = CAN_STATE_ERROR_PASSIVE;
+ cdev->can.can_stats.error_passive++;
+ cdev->can.state = CAN_STATE_ERROR_PASSIVE;
break;
case CAN_STATE_BUS_OFF:
/* bus-off state */
- priv->can.state = CAN_STATE_BUS_OFF;
- m_can_disable_all_interrupts(priv);
- priv->can.can_stats.bus_off++;
+ cdev->can.state = CAN_STATE_BUS_OFF;
+ m_can_disable_all_interrupts(cdev);
+ cdev->can.can_stats.bus_off++;
can_bus_off(dev);
break;
default:
@@ -709,7 +709,7 @@ static int m_can_handle_state_change(struct net_device *dev,
case CAN_STATE_ERROR_PASSIVE:
/* error passive state */
cf->can_id |= CAN_ERR_CRTL;
- ecr = m_can_read(priv, M_CAN_ECR);
+ ecr = m_can_read(cdev, M_CAN_ECR);
if (ecr & ECR_RP)
cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
if (bec.txerr > 127)
@@ -734,25 +734,25 @@ static int m_can_handle_state_change(struct net_device *dev,
static int m_can_handle_state_errors(struct net_device *dev, u32 psr)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
int work_done = 0;
if ((psr & PSR_EW) &&
- (priv->can.state != CAN_STATE_ERROR_WARNING)) {
+ (cdev->can.state != CAN_STATE_ERROR_WARNING)) {
netdev_dbg(dev, "entered error warning state\n");
work_done += m_can_handle_state_change(dev,
CAN_STATE_ERROR_WARNING);
}
if ((psr & PSR_EP) &&
- (priv->can.state != CAN_STATE_ERROR_PASSIVE)) {
+ (cdev->can.state != CAN_STATE_ERROR_PASSIVE)) {
netdev_dbg(dev, "entered error passive state\n");
work_done += m_can_handle_state_change(dev,
CAN_STATE_ERROR_PASSIVE);
}
if ((psr & PSR_BO) &&
- (priv->can.state != CAN_STATE_BUS_OFF)) {
+ (cdev->can.state != CAN_STATE_BUS_OFF)) {
netdev_dbg(dev, "entered error bus off state\n");
work_done += m_can_handle_state_change(dev,
CAN_STATE_BUS_OFF);
@@ -787,14 +787,14 @@ static inline bool is_lec_err(u32 psr)
static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
u32 psr)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
int work_done = 0;
if (irqstatus & IR_RF0L)
work_done += m_can_handle_lost_msg(dev);
/* handle lec errors on the bus */
- if ((priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) &&
+ if ((cdev->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) &&
is_lec_err(psr))
work_done += m_can_handle_lec_err(dev, psr & LEC_UNUSED);
@@ -806,15 +806,15 @@ static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
static int m_can_rx_handler(struct net_device *dev, int quota)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
int work_done = 0;
u32 irqstatus, psr;
- irqstatus = priv->irqstatus | m_can_read(priv, M_CAN_IR);
+ irqstatus = cdev->irqstatus | m_can_read(cdev, M_CAN_IR);
if (!irqstatus)
goto end;
- psr = m_can_read(priv, M_CAN_PSR);
+ psr = m_can_read(cdev, M_CAN_PSR);
if (irqstatus & IR_ERR_STATE)
work_done += m_can_handle_state_errors(dev, psr);
@@ -829,11 +829,11 @@ static int m_can_rx_handler(struct net_device *dev, int quota)
static int m_can_rx_peripherial(struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
m_can_rx_handler(dev, 1);
- m_can_enable_all_interrupts(priv);
+ m_can_enable_all_interrupts(cdev);
return 0;
}
@@ -841,13 +841,13 @@ static int m_can_rx_peripherial(struct net_device *dev)
static int m_can_poll(struct napi_struct *napi, int quota)
{
struct net_device *dev = napi->dev;
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
int work_done;
work_done = m_can_rx_handler(dev, quota);
if (work_done < quota) {
napi_complete_done(napi, work_done);
- m_can_enable_all_interrupts(priv);
+ m_can_enable_all_interrupts(cdev);
}
return work_done;
@@ -861,11 +861,11 @@ static void m_can_echo_tx_event(struct net_device *dev)
int i = 0;
unsigned int msg_mark;
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
/* read tx event fifo status */
- m_can_txefs = m_can_read(priv, M_CAN_TXEFS);
+ m_can_txefs = m_can_read(cdev, M_CAN_TXEFS);
/* Get Tx Event fifo element count */
txe_count = (m_can_txefs & TXEFS_EFFL_MASK)
@@ -874,15 +874,15 @@ static void m_can_echo_tx_event(struct net_device *dev)
/* Get and process all sent elements */
for (i = 0; i < txe_count; i++) {
/* retrieve get index */
- fgi = (m_can_read(priv, M_CAN_TXEFS) & TXEFS_EFGI_MASK)
+ fgi = (m_can_read(cdev, M_CAN_TXEFS) & TXEFS_EFGI_MASK)
>> TXEFS_EFGI_SHIFT;
/* get message marker */
- msg_mark = (m_can_txe_fifo_read(priv, fgi, 4) &
+ msg_mark = (m_can_txe_fifo_read(cdev, fgi, 4) &
TX_EVENT_MM_MASK) >> TX_EVENT_MM_SHIFT;
/* ack txe element */
- m_can_write(priv, M_CAN_TXEFA, (TXEFA_EFAI_MASK &
+ m_can_write(cdev, M_CAN_TXEFA, (TXEFA_EFAI_MASK &
(fgi << TXEFA_EFAI_SHIFT)));
/* update stats */
@@ -894,20 +894,20 @@ static void m_can_echo_tx_event(struct net_device *dev)
static irqreturn_t m_can_isr(int irq, void *dev_id)
{
struct net_device *dev = (struct net_device *)dev_id;
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
u32 ir;
- ir = m_can_read(priv, M_CAN_IR);
+ ir = m_can_read(cdev, M_CAN_IR);
if (!ir)
return IRQ_NONE;
/* ACK all irqs */
if (ir & IR_ALL_INT)
- m_can_write(priv, M_CAN_IR, ir);
+ m_can_write(cdev, M_CAN_IR, ir);
- if (priv->ops->clear_interrupts)
- priv->ops->clear_interrupts(priv);
+ if (cdev->ops->clear_interrupts)
+ cdev->ops->clear_interrupts(cdev);
/* schedule NAPI in case of
* - rx IRQ
@@ -915,15 +915,15 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
* - bus error IRQ and bus error reporting
*/
if ((ir & IR_RF0N) || (ir & IR_ERR_ALL_30X)) {
- priv->irqstatus = ir;
- m_can_disable_all_interrupts(priv);
- if (!priv->is_peripherial)
- napi_schedule(&priv->napi);
+ cdev->irqstatus = ir;
+ m_can_disable_all_interrupts(cdev);
+ if (!cdev->is_peripherial)
+ napi_schedule(&cdev->napi);
else
m_can_rx_peripherial(dev);
}
- if (priv->version == 30) {
+ if (cdev->version == 30) {
if (ir & IR_TC) {
/* Transmission Complete Interrupt*/
stats->tx_bytes += can_get_echo_skb(dev, 0);
@@ -937,7 +937,7 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
m_can_echo_tx_event(dev);
can_led_event(dev, CAN_LED_EVENT_TX);
if (netif_queue_stopped(dev) &&
- !m_can_tx_fifo_full(priv))
+ !m_can_tx_fifo_full(cdev))
netif_wake_queue(dev);
}
}
@@ -995,9 +995,9 @@ static const struct can_bittiming_const m_can_data_bittiming_const_31X = {
static int m_can_set_bittiming(struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
- const struct can_bittiming *bt = &priv->can.bittiming;
- const struct can_bittiming *dbt = &priv->can.data_bittiming;
+ struct m_can_classdev *cdev = netdev_priv(dev);
+ const struct can_bittiming *bt = &cdev->can.bittiming;
+ const struct can_bittiming *dbt = &cdev->can.data_bittiming;
u16 brp, sjw, tseg1, tseg2;
u32 reg_btp;
@@ -1007,9 +1007,9 @@ static int m_can_set_bittiming(struct net_device *dev)
tseg2 = bt->phase_seg2 - 1;
reg_btp = (brp << NBTP_NBRP_SHIFT) | (sjw << NBTP_NSJW_SHIFT) |
(tseg1 << NBTP_NTSEG1_SHIFT) | (tseg2 << NBTP_NTSEG2_SHIFT);
- m_can_write(priv, M_CAN_NBTP, reg_btp);
+ m_can_write(cdev, M_CAN_NBTP, reg_btp);
- if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
+ if (cdev->can.ctrlmode & CAN_CTRLMODE_FD) {
reg_btp = 0;
brp = dbt->brp - 1;
sjw = dbt->sjw - 1;
@@ -1031,7 +1031,7 @@ static int m_can_set_bittiming(struct net_device *dev)
/* Equation based on Bosch's M_CAN User Manual's
* Transmitter Delay Compensation Section
*/
- tdco = (priv->can.clock.freq / 1000) *
+ tdco = (cdev->can.clock.freq / 1000) *
ssp / dbt->bitrate;
/* Max valid TDCO value is 127 */
@@ -1042,7 +1042,7 @@ static int m_can_set_bittiming(struct net_device *dev)
}
reg_btp |= DBTP_TDC;
- m_can_write(priv, M_CAN_TDCR,
+ m_can_write(cdev, M_CAN_TDCR,
tdco << TDCR_TDCO_SHIFT);
}
@@ -1051,7 +1051,7 @@ static int m_can_set_bittiming(struct net_device *dev)
(tseg1 << DBTP_DTSEG1_SHIFT) |
(tseg2 << DBTP_DTSEG2_SHIFT);
- m_can_write(priv, M_CAN_DBTP, reg_btp);
+ m_can_write(cdev, M_CAN_DBTP, reg_btp);
}
return 0;
@@ -1068,63 +1068,63 @@ static int m_can_set_bittiming(struct net_device *dev)
*/
static void m_can_chip_config(struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
u32 cccr, test;
- m_can_config_endisable(priv, true);
+ m_can_config_endisable(cdev, true);
/* RX Buffer/FIFO Element Size 64 bytes data field */
- m_can_write(priv, M_CAN_RXESC, M_CAN_RXESC_64BYTES);
+ m_can_write(cdev, M_CAN_RXESC, M_CAN_RXESC_64BYTES);
/* Accept Non-matching Frames Into FIFO 0 */
- m_can_write(priv, M_CAN_GFC, 0x0);
+ m_can_write(cdev, M_CAN_GFC, 0x0);
- if (priv->version == 30) {
+ if (cdev->version == 30) {
/* only support one Tx Buffer currently */
- m_can_write(priv, M_CAN_TXBC, (1 << TXBC_NDTB_SHIFT) |
- priv->mcfg[MRAM_TXB].off);
+ m_can_write(cdev, M_CAN_TXBC, (1 << TXBC_NDTB_SHIFT) |
+ cdev->mcfg[MRAM_TXB].off);
} else {
/* TX FIFO is used for newer IP Core versions */
- m_can_write(priv, M_CAN_TXBC,
- (priv->mcfg[MRAM_TXB].num << TXBC_TFQS_SHIFT) |
- (priv->mcfg[MRAM_TXB].off));
+ m_can_write(cdev, M_CAN_TXBC,
+ (cdev->mcfg[MRAM_TXB].num << TXBC_TFQS_SHIFT) |
+ (cdev->mcfg[MRAM_TXB].off));
}
/* support 64 bytes payload */
- m_can_write(priv, M_CAN_TXESC, TXESC_TBDS_64BYTES);
+ m_can_write(cdev, M_CAN_TXESC, TXESC_TBDS_64BYTES);
/* TX Event FIFO */
- if (priv->version == 30) {
- m_can_write(priv, M_CAN_TXEFC, (1 << TXEFC_EFS_SHIFT) |
- priv->mcfg[MRAM_TXE].off);
+ if (cdev->version == 30) {
+ m_can_write(cdev, M_CAN_TXEFC, (1 << TXEFC_EFS_SHIFT) |
+ cdev->mcfg[MRAM_TXE].off);
} else {
/* Full TX Event FIFO is used */
- m_can_write(priv, M_CAN_TXEFC,
- ((priv->mcfg[MRAM_TXE].num << TXEFC_EFS_SHIFT)
+ m_can_write(cdev, M_CAN_TXEFC,
+ ((cdev->mcfg[MRAM_TXE].num << TXEFC_EFS_SHIFT)
& TXEFC_EFS_MASK) |
- priv->mcfg[MRAM_TXE].off);
+ cdev->mcfg[MRAM_TXE].off);
}
/* rx fifo configuration, blocking mode, fifo size 1 */
- m_can_write(priv, M_CAN_RXF0C,
- (priv->mcfg[MRAM_RXF0].num << RXFC_FS_SHIFT) |
- priv->mcfg[MRAM_RXF0].off);
+ m_can_write(cdev, M_CAN_RXF0C,
+ (cdev->mcfg[MRAM_RXF0].num << RXFC_FS_SHIFT) |
+ cdev->mcfg[MRAM_RXF0].off);
- m_can_write(priv, M_CAN_RXF1C,
- (priv->mcfg[MRAM_RXF1].num << RXFC_FS_SHIFT) |
- priv->mcfg[MRAM_RXF1].off);
+ m_can_write(cdev, M_CAN_RXF1C,
+ (cdev->mcfg[MRAM_RXF1].num << RXFC_FS_SHIFT) |
+ cdev->mcfg[MRAM_RXF1].off);
- cccr = m_can_read(priv, M_CAN_CCCR);
- test = m_can_read(priv, M_CAN_TEST);
+ cccr = m_can_read(cdev, M_CAN_CCCR);
+ test = m_can_read(cdev, M_CAN_TEST);
test &= ~TEST_LBCK;
- if (priv->version == 30) {
+ if (cdev->version == 30) {
/* Version 3.0.x */
cccr &= ~(CCCR_TEST | CCCR_MON |
(CCCR_CMR_MASK << CCCR_CMR_SHIFT) |
(CCCR_CME_MASK << CCCR_CME_SHIFT));
- if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
+ if (cdev->can.ctrlmode & CAN_CTRLMODE_FD)
cccr |= CCCR_CME_CANFD_BRS << CCCR_CME_SHIFT;
} else {
@@ -1133,61 +1133,61 @@ static void m_can_chip_config(struct net_device *dev)
CCCR_NISO);
/* Only 3.2.x has NISO Bit implemented */
- if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
+ if (cdev->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
cccr |= CCCR_NISO;
- if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
+ if (cdev->can.ctrlmode & CAN_CTRLMODE_FD)
cccr |= (CCCR_BRSE | CCCR_FDOE);
}
/* Loopback Mode */
- if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
+ if (cdev->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
cccr |= CCCR_TEST | CCCR_MON;
test |= TEST_LBCK;
}
/* Enable Monitoring (all versions) */
- if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
+ if (cdev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
cccr |= CCCR_MON;
/* Write config */
- m_can_write(priv, M_CAN_CCCR, cccr);
- m_can_write(priv, M_CAN_TEST, test);
+ m_can_write(cdev, M_CAN_CCCR, cccr);
+ m_can_write(cdev, M_CAN_TEST, test);
/* Enable interrupts */
- m_can_write(priv, M_CAN_IR, IR_ALL_INT);
- if (!(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
- if (priv->version == 30)
- m_can_write(priv, M_CAN_IE, IR_ALL_INT &
+ m_can_write(cdev, M_CAN_IR, IR_ALL_INT);
+ if (!(cdev->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
+ if (cdev->version == 30)
+ m_can_write(cdev, M_CAN_IE, IR_ALL_INT &
~(IR_ERR_LEC_30X));
else
- m_can_write(priv, M_CAN_IE, IR_ALL_INT &
+ m_can_write(cdev, M_CAN_IE, IR_ALL_INT &
~(IR_ERR_LEC_31X));
else
- m_can_write(priv, M_CAN_IE, IR_ALL_INT);
+ m_can_write(cdev, M_CAN_IE, IR_ALL_INT);
/* route all interrupts to INT0 */
- m_can_write(priv, M_CAN_ILS, ILS_ALL_INT0);
+ m_can_write(cdev, M_CAN_ILS, ILS_ALL_INT0);
/* set bittiming params */
m_can_set_bittiming(dev);
- m_can_config_endisable(priv, false);
+ m_can_config_endisable(cdev, false);
- if (priv->ops->init)
- priv->ops->init(priv);
+ if (cdev->ops->init)
+ cdev->ops->init(cdev);
}
static void m_can_start(struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
/* basic m_can configuration */
m_can_chip_config(dev);
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
+ cdev->can.state = CAN_STATE_ERROR_ACTIVE;
- m_can_enable_all_interrupts(priv);
+ m_can_enable_all_interrupts(cdev);
}
static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
@@ -1210,7 +1210,7 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
* else it returns the release and step coded as:
* return value = 10 * <release> + 1 * <step>
*/
-static int m_can_check_core_release(struct m_can_priv *priv)
+static int m_can_check_core_release(struct m_can_classdev *cdev)
{
u32 crel_reg;
u8 rel;
@@ -1220,7 +1220,7 @@ static int m_can_check_core_release(struct m_can_priv *priv)
/* Read Core Release Version and split into version number
* Example: Version 3.2.1 => rel = 3; step = 2; substep = 1;
*/
- crel_reg = m_can_read(priv, M_CAN_CREL);
+ crel_reg = m_can_read(cdev, M_CAN_CREL);
rel = (u8)((crel_reg & CREL_REL_MASK) >> CREL_REL_SHIFT);
step = (u8)((crel_reg & CREL_STEP_MASK) >> CREL_STEP_SHIFT);
@@ -1238,19 +1238,19 @@ static int m_can_check_core_release(struct m_can_priv *priv)
/* Selectable Non ISO support only in version 3.2.x
* This function checks if the bit is writable.
*/
-static bool m_can_niso_supported(struct m_can_priv *priv)
+static bool m_can_niso_supported(struct m_can_classdev *cdev)
{
u32 cccr_reg, cccr_poll = 0;
int niso_timeout = -ETIMEDOUT;
int i;
- m_can_config_endisable(priv, true);
- cccr_reg = m_can_read(priv, M_CAN_CCCR);
+ m_can_config_endisable(cdev, true);
+ cccr_reg = m_can_read(cdev, M_CAN_CCCR);
cccr_reg |= CCCR_NISO;
- m_can_write(priv, M_CAN_CCCR, cccr_reg);
+ m_can_write(cdev, M_CAN_CCCR, cccr_reg);
for (i = 0; i <= 10; i++) {
- cccr_poll = m_can_read(priv, M_CAN_CCCR);
+ cccr_poll = m_can_read(cdev, M_CAN_CCCR);
if (cccr_poll == cccr_reg) {
niso_timeout = 0;
break;
@@ -1261,15 +1261,15 @@ static bool m_can_niso_supported(struct m_can_priv *priv)
/* Clear NISO */
cccr_reg &= ~(CCCR_NISO);
- m_can_write(priv, M_CAN_CCCR, cccr_reg);
+ m_can_write(cdev, M_CAN_CCCR, cccr_reg);
- m_can_config_endisable(priv, false);
+ m_can_config_endisable(cdev, false);
/* return false if time out (-ETIMEDOUT), else return true */
return !niso_timeout;
}
-static int m_can_dev_setup(struct m_can_priv *m_can_dev)
+static int m_can_dev_setup(struct m_can_classdev *m_can_dev)
{
struct net_device *dev = m_can_dev->net;
int m_can_version;
@@ -1346,30 +1346,30 @@ static int m_can_dev_setup(struct m_can_priv *m_can_dev)
static void m_can_stop(struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
/* disable all interrupts */
- m_can_disable_all_interrupts(priv);
+ m_can_disable_all_interrupts(cdev);
/* set the state as STOPPED */
- priv->can.state = CAN_STATE_STOPPED;
+ cdev->can.state = CAN_STATE_STOPPED;
}
static int m_can_close(struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
netif_stop_queue(dev);
- if (!priv->is_peripherial)
- napi_disable(&priv->napi);
+ if (!cdev->is_peripherial)
+ napi_disable(&cdev->napi);
m_can_stop(dev);
- m_can_clk_stop(priv);
+ m_can_clk_stop(cdev);
free_irq(dev->irq, dev);
- if (priv->is_peripherial) {
- priv->tx_skb = NULL;
- destroy_workqueue(priv->tx_wq);
- priv->tx_wq = NULL;
+ if (cdev->is_peripherial) {
+ cdev->tx_skb = NULL;
+ destroy_workqueue(cdev->tx_wq);
+ cdev->tx_wq = NULL;
}
close_candev(dev);
@@ -1380,23 +1380,23 @@ static int m_can_close(struct net_device *dev)
static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
/*get wrap around for loopback skb index */
- unsigned int wrap = priv->can.echo_skb_max;
+ unsigned int wrap = cdev->can.echo_skb_max;
int next_idx;
/* calculate next index */
next_idx = (++putidx >= wrap ? 0 : putidx);
/* check if occupied */
- return !!priv->can.echo_skb[next_idx];
+ return !!cdev->can.echo_skb[next_idx];
}
-static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
+static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev)
{
- struct canfd_frame *cf = (struct canfd_frame *)priv->tx_skb->data;
- struct net_device *dev = priv->net;
- struct sk_buff *skb = priv->tx_skb;
+ struct canfd_frame *cf = (struct canfd_frame *)cdev->tx_skb->data;
+ struct net_device *dev = cdev->net;
+ struct sk_buff *skb = cdev->tx_skb;
u32 id, cccr, fdflags;
int i;
int putidx;
@@ -1413,23 +1413,23 @@ static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
if (cf->can_id & CAN_RTR_FLAG)
id |= TX_BUF_RTR;
- if (priv->version == 30) {
+ if (cdev->version == 30) {
netif_stop_queue(dev);
/* message ram configuration */
- m_can_fifo_write(priv, 0, M_CAN_FIFO_ID, id);
- m_can_fifo_write(priv, 0, M_CAN_FIFO_DLC,
+ m_can_fifo_write(cdev, 0, M_CAN_FIFO_ID, id);
+ m_can_fifo_write(cdev, 0, M_CAN_FIFO_DLC,
can_len2dlc(cf->len) << 16);
for (i = 0; i < cf->len; i += 4)
- m_can_fifo_write(priv, 0,
+ m_can_fifo_write(cdev, 0,
M_CAN_FIFO_DATA(i / 4),
*(u32 *)(cf->data + i));
can_put_echo_skb(skb, dev, 0);
- if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
- cccr = m_can_read(priv, M_CAN_CCCR);
+ if (cdev->can.ctrlmode & CAN_CTRLMODE_FD) {
+ cccr = m_can_read(cdev, M_CAN_CCCR);
cccr &= ~(CCCR_CMR_MASK << CCCR_CMR_SHIFT);
if (can_is_canfd_skb(skb)) {
if (cf->flags & CANFD_BRS)
@@ -1441,16 +1441,16 @@ static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
} else {
cccr |= CCCR_CMR_CAN << CCCR_CMR_SHIFT;
}
- m_can_write(priv, M_CAN_CCCR, cccr);
+ m_can_write(cdev, M_CAN_CCCR, cccr);
}
- m_can_write(priv, M_CAN_TXBTIE, 0x1);
- m_can_write(priv, M_CAN_TXBAR, 0x1);
+ m_can_write(cdev, M_CAN_TXBTIE, 0x1);
+ m_can_write(cdev, M_CAN_TXBAR, 0x1);
/* End of xmit function for version 3.0.x */
} else {
/* Transmit routine for version >= v3.1.x */
/* Check if FIFO full */
- if (m_can_tx_fifo_full(priv)) {
+ if (m_can_tx_fifo_full(cdev)) {
/* This shouldn't happen */
netif_stop_queue(dev);
netdev_warn(dev,
@@ -1459,10 +1459,10 @@ static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
}
/* get put index for frame */
- putidx = ((m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQPI_MASK)
+ putidx = ((m_can_read(cdev, M_CAN_TXFQS) & TXFQS_TFQPI_MASK)
>> TXFQS_TFQPI_SHIFT);
/* Write ID Field to FIFO Element */
- m_can_fifo_write(priv, putidx, M_CAN_FIFO_ID, id);
+ m_can_fifo_write(cdev, putidx, M_CAN_FIFO_ID, id);
/* get CAN FD configuration of frame */
fdflags = 0;
@@ -1477,14 +1477,14 @@ static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
* it is used in TX interrupt for
* sending the correct echo frame
*/
- m_can_fifo_write(priv, putidx, M_CAN_FIFO_DLC,
+ m_can_fifo_write(cdev, putidx, M_CAN_FIFO_DLC,
((putidx << TX_BUF_MM_SHIFT) &
TX_BUF_MM_MASK) |
(can_len2dlc(cf->len) << 16) |
fdflags | TX_BUF_EFC);
for (i = 0; i < cf->len; i += 4)
- m_can_fifo_write(priv, putidx, M_CAN_FIFO_DATA(i / 4),
+ m_can_fifo_write(cdev, putidx, M_CAN_FIFO_DATA(i / 4),
*(u32 *)(cf->data + i));
/* Push loopback echo.
@@ -1493,10 +1493,10 @@ static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
can_put_echo_skb(skb, dev, putidx);
/* Enable TX FIFO element to start transfer */
- m_can_write(priv, M_CAN_TXBAR, (1 << putidx));
+ m_can_write(cdev, M_CAN_TXBAR, (1 << putidx));
/* stop network queue if fifo full */
- if (m_can_tx_fifo_full(priv) ||
+ if (m_can_tx_fifo_full(cdev) ||
m_can_next_echo_skb_occupied(dev, putidx))
netif_stop_queue(dev);
}
@@ -1506,39 +1506,39 @@ static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
static void m_can_tx_work_queue(struct work_struct *ws)
{
- struct m_can_priv *priv = container_of(ws, struct m_can_priv,
+ struct m_can_classdev *cdev = container_of(ws, struct m_can_classdev,
tx_work);
netdev_tx_t ret;
- ret = m_can_tx_handler(priv);
+ ret = m_can_tx_handler(cdev);
if (ret == NETDEV_TX_OK)
- priv->tx_skb = NULL;
+ cdev->tx_skb = NULL;
}
static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
- if (priv->is_peripherial) {
- if (priv->tx_skb) {
+ if (cdev->is_peripherial) {
+ if (cdev->tx_skb) {
netdev_err(dev, "hard_xmit called while tx busy\n");
return NETDEV_TX_BUSY;
}
- if (priv->can.state == CAN_STATE_BUS_OFF) {
+ if (cdev->can.state == CAN_STATE_BUS_OFF) {
m_can_clean(dev);
} else {
- priv->tx_skb = skb;
- netif_stop_queue(priv->net);
- queue_work(priv->tx_wq, &priv->tx_work);
+ cdev->tx_skb = skb;
+ netif_stop_queue(cdev->net);
+ queue_work(cdev->tx_wq, &cdev->tx_work);
}
} else {
- priv->tx_skb = skb;
- return m_can_tx_handler(priv);
+ cdev->tx_skb = skb;
+ return m_can_tx_handler(cdev);
}
return NETDEV_TX_OK;
@@ -1546,10 +1546,10 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
static int m_can_open(struct net_device *dev)
{
- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *cdev = netdev_priv(dev);
int err;
- err = m_can_clk_start(priv);
+ err = m_can_clk_start(cdev);
if (err)
return err;
@@ -1561,16 +1561,16 @@ static int m_can_open(struct net_device *dev)
}
/* register interrupt handler */
- if (priv->is_peripherial) {
- priv->tx_skb = NULL;
- priv->tx_wq = alloc_workqueue("mcan_wq",
+ if (cdev->is_peripherial) {
+ cdev->tx_skb = NULL;
+ cdev->tx_wq = alloc_workqueue("mcan_wq",
WQ_FREEZABLE | WQ_MEM_RECLAIM, 0);
- if (!priv->tx_wq) {
+ if (!cdev->tx_wq) {
err = -ENOMEM;
goto out_wq_fail;
}
- INIT_WORK(&priv->tx_work, m_can_tx_work_queue);
+ INIT_WORK(&cdev->tx_work, m_can_tx_work_queue);
err = request_threaded_irq(dev->irq, NULL, m_can_isr,
IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
@@ -1590,20 +1590,20 @@ static int m_can_open(struct net_device *dev)
can_led_event(dev, CAN_LED_EVENT_OPEN);
- if (!priv->is_peripherial)
- napi_enable(&priv->napi);
+ if (!cdev->is_peripherial)
+ napi_enable(&cdev->napi);
netif_start_queue(dev);
return 0;
exit_irq_fail:
- if (priv->is_peripherial)
- destroy_workqueue(priv->tx_wq);
+ if (cdev->is_peripherial)
+ destroy_workqueue(cdev->tx_wq);
out_wq_fail:
close_candev(dev);
exit_disable_clks:
- m_can_clk_stop(priv);
+ m_can_clk_stop(cdev);
return err;
}
@@ -1622,61 +1622,61 @@ static int register_m_can_dev(struct net_device *dev)
return register_candev(dev);
}
-static void m_can_of_parse_mram(struct m_can_priv *priv,
+static void m_can_of_parse_mram(struct m_can_classdev *cdev,
const u32 *mram_config_vals)
{
- priv->mcfg[MRAM_SIDF].off = mram_config_vals[0];
- priv->mcfg[MRAM_SIDF].num = mram_config_vals[1];
- priv->mcfg[MRAM_XIDF].off = priv->mcfg[MRAM_SIDF].off +
- priv->mcfg[MRAM_SIDF].num * SIDF_ELEMENT_SIZE;
- priv->mcfg[MRAM_XIDF].num = mram_config_vals[2];
- priv->mcfg[MRAM_RXF0].off = priv->mcfg[MRAM_XIDF].off +
- priv->mcfg[MRAM_XIDF].num * XIDF_ELEMENT_SIZE;
- priv->mcfg[MRAM_RXF0].num = mram_config_vals[3] &
+ cdev->mcfg[MRAM_SIDF].off = mram_config_vals[0];
+ cdev->mcfg[MRAM_SIDF].num = mram_config_vals[1];
+ cdev->mcfg[MRAM_XIDF].off = cdev->mcfg[MRAM_SIDF].off +
+ cdev->mcfg[MRAM_SIDF].num * SIDF_ELEMENT_SIZE;
+ cdev->mcfg[MRAM_XIDF].num = mram_config_vals[2];
+ cdev->mcfg[MRAM_RXF0].off = cdev->mcfg[MRAM_XIDF].off +
+ cdev->mcfg[MRAM_XIDF].num * XIDF_ELEMENT_SIZE;
+ cdev->mcfg[MRAM_RXF0].num = mram_config_vals[3] &
(RXFC_FS_MASK >> RXFC_FS_SHIFT);
- priv->mcfg[MRAM_RXF1].off = priv->mcfg[MRAM_RXF0].off +
- priv->mcfg[MRAM_RXF0].num * RXF0_ELEMENT_SIZE;
- priv->mcfg[MRAM_RXF1].num = mram_config_vals[4] &
+ cdev->mcfg[MRAM_RXF1].off = cdev->mcfg[MRAM_RXF0].off +
+ cdev->mcfg[MRAM_RXF0].num * RXF0_ELEMENT_SIZE;
+ cdev->mcfg[MRAM_RXF1].num = mram_config_vals[4] &
(RXFC_FS_MASK >> RXFC_FS_SHIFT);
- priv->mcfg[MRAM_RXB].off = priv->mcfg[MRAM_RXF1].off +
- priv->mcfg[MRAM_RXF1].num * RXF1_ELEMENT_SIZE;
- priv->mcfg[MRAM_RXB].num = mram_config_vals[5];
- priv->mcfg[MRAM_TXE].off = priv->mcfg[MRAM_RXB].off +
- priv->mcfg[MRAM_RXB].num * RXB_ELEMENT_SIZE;
- priv->mcfg[MRAM_TXE].num = mram_config_vals[6];
- priv->mcfg[MRAM_TXB].off = priv->mcfg[MRAM_TXE].off +
- priv->mcfg[MRAM_TXE].num * TXE_ELEMENT_SIZE;
- priv->mcfg[MRAM_TXB].num = mram_config_vals[7] &
+ cdev->mcfg[MRAM_RXB].off = cdev->mcfg[MRAM_RXF1].off +
+ cdev->mcfg[MRAM_RXF1].num * RXF1_ELEMENT_SIZE;
+ cdev->mcfg[MRAM_RXB].num = mram_config_vals[5];
+ cdev->mcfg[MRAM_TXE].off = cdev->mcfg[MRAM_RXB].off +
+ cdev->mcfg[MRAM_RXB].num * RXB_ELEMENT_SIZE;
+ cdev->mcfg[MRAM_TXE].num = mram_config_vals[6];
+ cdev->mcfg[MRAM_TXB].off = cdev->mcfg[MRAM_TXE].off +
+ cdev->mcfg[MRAM_TXE].num * TXE_ELEMENT_SIZE;
+ cdev->mcfg[MRAM_TXB].num = mram_config_vals[7] &
(TXBC_NDTB_MASK >> TXBC_NDTB_SHIFT);
- dev_dbg(priv->dev,
+ dev_dbg(cdev->dev,
"sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
- priv->mcfg[MRAM_SIDF].off, priv->mcfg[MRAM_SIDF].num,
- priv->mcfg[MRAM_XIDF].off, priv->mcfg[MRAM_XIDF].num,
- priv->mcfg[MRAM_RXF0].off, priv->mcfg[MRAM_RXF0].num,
- priv->mcfg[MRAM_RXF1].off, priv->mcfg[MRAM_RXF1].num,
- priv->mcfg[MRAM_RXB].off, priv->mcfg[MRAM_RXB].num,
- priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num,
- priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num);
+ cdev->mcfg[MRAM_SIDF].off, cdev->mcfg[MRAM_SIDF].num,
+ cdev->mcfg[MRAM_XIDF].off, cdev->mcfg[MRAM_XIDF].num,
+ cdev->mcfg[MRAM_RXF0].off, cdev->mcfg[MRAM_RXF0].num,
+ cdev->mcfg[MRAM_RXF1].off, cdev->mcfg[MRAM_RXF1].num,
+ cdev->mcfg[MRAM_RXB].off, cdev->mcfg[MRAM_RXB].num,
+ cdev->mcfg[MRAM_TXE].off, cdev->mcfg[MRAM_TXE].num,
+ cdev->mcfg[MRAM_TXB].off, cdev->mcfg[MRAM_TXB].num);
}
-void m_can_init_ram(struct m_can_priv *priv)
+void m_can_init_ram(struct m_can_classdev *cdev)
{
int end, i, start;
/* initialize the entire Message RAM in use to avoid possible
* ECC/parity checksum errors when reading an uninitialized buffer
*/
- start = priv->mcfg[MRAM_SIDF].off;
- end = priv->mcfg[MRAM_TXB].off +
- priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
+ start = cdev->mcfg[MRAM_SIDF].off;
+ end = cdev->mcfg[MRAM_TXB].off +
+ cdev->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
for (i = start; i < end; i += 4)
- m_can_fifo_write_no_off(priv, i, 0x0);
+ m_can_fifo_write_no_off(cdev, i, 0x0);
}
EXPORT_SYMBOL_GPL(m_can_init_ram);
-int m_can_class_get_clocks(struct m_can_priv *m_can_dev)
+int m_can_class_get_clocks(struct m_can_classdev *m_can_dev)
{
int ret = 0;
@@ -1692,9 +1692,9 @@ int m_can_class_get_clocks(struct m_can_priv *m_can_dev)
}
EXPORT_SYMBOL_GPL(m_can_class_get_clocks);
-struct m_can_priv *m_can_class_allocate_dev(struct device *dev)
+struct m_can_classdev *m_can_class_allocate_dev(struct device *dev)
{
- struct m_can_priv *class_dev = NULL;
+ struct m_can_classdev *class_dev = NULL;
u32 mram_config_vals[MRAM_CFG_LEN];
struct net_device *net_dev;
u32 tx_fifo_size;
@@ -1723,7 +1723,7 @@ struct m_can_priv *m_can_class_allocate_dev(struct device *dev)
class_dev = netdev_priv(net_dev);
if (!class_dev) {
- dev_err(dev, "Failed to init netdev private");
+ dev_err(dev, "Failed to init netdev cdevate");
goto out;
}
@@ -1737,7 +1737,7 @@ struct m_can_priv *m_can_class_allocate_dev(struct device *dev)
}
EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);
-int m_can_class_register(struct m_can_priv *m_can_dev)
+int m_can_class_register(struct m_can_classdev *m_can_dev)
{
int ret;
@@ -1785,18 +1785,18 @@ EXPORT_SYMBOL_GPL(m_can_class_register);
int m_can_class_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
- struct m_can_priv *priv = netdev_priv(ndev);
+ struct m_can_classdev *cdev = netdev_priv(ndev);
if (netif_running(ndev)) {
netif_stop_queue(ndev);
netif_device_detach(ndev);
m_can_stop(ndev);
- m_can_clk_stop(priv);
+ m_can_clk_stop(cdev);
}
pinctrl_pm_select_sleep_state(dev);
- priv->can.state = CAN_STATE_SLEEPING;
+ cdev->can.state = CAN_STATE_SLEEPING;
return 0;
}
@@ -1805,20 +1805,20 @@ EXPORT_SYMBOL_GPL(m_can_class_suspend);
int m_can_class_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
- struct m_can_priv *priv = netdev_priv(ndev);
+ struct m_can_classdev *cdev = netdev_priv(ndev);
pinctrl_pm_select_default_state(dev);
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
+ cdev->can.state = CAN_STATE_ERROR_ACTIVE;
if (netif_running(ndev)) {
int ret;
- ret = m_can_clk_start(priv);
+ ret = m_can_clk_start(cdev);
if (ret)
return ret;
- m_can_init_ram(priv);
+ m_can_init_ram(cdev);
m_can_start(ndev);
netif_device_attach(ndev);
netif_start_queue(ndev);
@@ -1828,7 +1828,7 @@ int m_can_class_resume(struct device *dev)
}
EXPORT_SYMBOL_GPL(m_can_class_resume);
-void m_can_class_unregister(struct m_can_priv *m_can_dev)
+void m_can_class_unregister(struct m_can_classdev *m_can_dev)
{
unregister_candev(m_can_dev->net);
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index b60f27dd9f33..b4f88553f228 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -57,19 +57,19 @@ struct mram_cfg {
u8 num;
};
-struct m_can_priv;
+struct m_can_classdev;
struct m_can_ops {
/* Device specific call backs */
- int (*clear_interrupts)(struct m_can_priv *m_can_class);
- u32 (*read_reg)(struct m_can_priv *m_can_class, int reg);
- int (*write_reg)(struct m_can_priv *m_can_class, int reg, int val);
- u32 (*read_fifo)(struct m_can_priv *m_can_class, int addr_offset);
- int (*write_fifo)(struct m_can_priv *m_can_class, int addr_offset,
+ int (*clear_interrupts)(struct m_can_classdev *cdev);
+ u32 (*read_reg)(struct m_can_classdev *cdev, int reg);
+ int (*write_reg)(struct m_can_classdev *cdev, int reg, int val);
+ u32 (*read_fifo)(struct m_can_classdev *cdev, int addr_offset);
+ int (*write_fifo)(struct m_can_classdev *cdev, int addr_offset,
int val);
- int (*init)(struct m_can_priv *m_can_class);
+ int (*init)(struct m_can_classdev *cdev);
};
-struct m_can_priv {
+struct m_can_classdev {
struct can_priv can;
struct napi_struct napi;
struct net_device *net;
@@ -98,12 +98,12 @@ struct m_can_priv {
struct mram_cfg mcfg[MRAM_CFG_NUM];
};
-struct m_can_priv *m_can_class_allocate_dev(struct device *dev);
-int m_can_class_register(struct m_can_priv *m_can_dev);
-void m_can_class_unregister(struct m_can_priv *m_can_dev);
-int m_can_class_get_clocks(struct m_can_priv *m_can_dev);
-void m_can_init_ram(struct m_can_priv *priv);
-void m_can_config_endisable(struct m_can_priv *priv, bool enable);
+struct m_can_classdev *m_can_class_allocate_dev(struct device *dev);
+int m_can_class_register(struct m_can_classdev *cdev);
+void m_can_class_unregister(struct m_can_classdev *cdev);
+int m_can_class_get_clocks(struct m_can_classdev *cdev);
+void m_can_init_ram(struct m_can_classdev *priv);
+void m_can_config_endisable(struct m_can_classdev *priv, bool enable);
int m_can_class_suspend(struct device *dev);
int m_can_class_resume(struct device *dev);
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index b02d49f9ee4c..601be42b9a4b 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -14,7 +14,7 @@ struct m_can_plat_priv {
void __iomem *mram_base;
};
-static u32 iomap_read_reg(struct m_can_priv *cdev, int reg)
+static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_priv *)cdev->device_data;
@@ -22,7 +22,7 @@ static u32 iomap_read_reg(struct m_can_priv *cdev, int reg)
return readl(priv->base + reg);
}
-static u32 iomap_read_fifo(struct m_can_priv *cdev, int offset)
+static u32 iomap_read_fifo(struct m_can_classdev *cdev, int offset)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_priv *)cdev->device_data;
@@ -30,7 +30,7 @@ static u32 iomap_read_fifo(struct m_can_priv *cdev, int offset)
return readl(priv->mram_base + offset);
}
-static int iomap_write_reg(struct m_can_priv *cdev, int reg, int val)
+static int iomap_write_reg(struct m_can_classdev *cdev, int reg, int val)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_priv *)cdev->device_data;
@@ -40,7 +40,7 @@ static int iomap_write_reg(struct m_can_priv *cdev, int reg, int val)
return 0;
}
-static int iomap_write_fifo(struct m_can_priv *cdev, int offset, int val)
+static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, int val)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_priv *)cdev->device_data;
@@ -59,7 +59,7 @@ static struct m_can_ops m_can_plat_ops = {
static int m_can_plat_probe(struct platform_device *pdev)
{
- struct m_can_priv *mcan_class;
+ struct m_can_classdev *mcan_class;
struct m_can_plat_priv *priv;
struct resource *res;
void __iomem *addr;
@@ -131,7 +131,7 @@ static __maybe_unused int m_can_resume(struct device *dev)
static int m_can_plat_remove(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
- struct m_can_priv *mcan_class = netdev_priv(dev);
+ struct m_can_classdev *mcan_class = netdev_priv(dev);
m_can_class_unregister(mcan_class);
@@ -143,7 +143,7 @@ static int m_can_plat_remove(struct platform_device *pdev)
static int __maybe_unused m_can_runtime_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
- struct m_can_priv *mcan_class = netdev_priv(ndev);
+ struct m_can_classdev *mcan_class = netdev_priv(ndev);
m_can_class_suspend(dev);
@@ -156,7 +156,7 @@ static int __maybe_unused m_can_runtime_suspend(struct device *dev)
static int __maybe_unused m_can_runtime_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
- struct m_can_priv *mcan_class = netdev_priv(ndev);
+ struct m_can_classdev *mcan_class = netdev_priv(ndev);
int err;
err = clk_prepare_enable(mcan_class->hclk);
--
2.20.1.390.gb5101f9297
Add the TCAN4x5x SPI CAN driver. This device uses the
Bosch MCAN IP core along with a SPI interface map.
Register to the MCAN common core code to manage the MCAN IP.
This device has a special method to indicate a write/read
operation on the data payload.
Signed-off-by: Dan Murphy <[email protected]>
---
v8 - No changes - https://lore.kernel.org/patchwork/patch/1047978/
v7 - Fixed remaining checkpatch issues and renamed callbacks for m_can change -
https://lore.kernel.org/patchwork/patch/1047221/
v6 - Updated Kconfig help and added REGMAP_SPI dependency, fixed coding style issues,
removed setting GPIO high in wake routine, change -EIO to return ret in init and
setup functions - https://lore.kernel.org/patchwork/patch/1042443/
drivers/net/can/m_can/Kconfig | 9 +
drivers/net/can/m_can/Makefile | 1 +
drivers/net/can/m_can/tcan4x5x.c | 533 +++++++++++++++++++++++++++++++
3 files changed, 543 insertions(+)
create mode 100644 drivers/net/can/m_can/tcan4x5x.c
diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
index f7119fd72df4..cf4f32765efa 100644
--- a/drivers/net/can/m_can/Kconfig
+++ b/drivers/net/can/m_can/Kconfig
@@ -12,3 +12,12 @@ config CAN_M_CAN_PLATFORM
Say Y here if you want support for IO Mapped Bosch M_CAN controller.
This support is for devices that have the Bosch M_CAN controller
IP embedded into the device and the IP is IO Mapped to the processor.
+
+config CAN_M_CAN_TCAN4X5X
+ depends on CAN_M_CAN
+ depends on REGMAP_SPI
+ tristate "TCAN4X5X M_CAN device"
+ ---help---
+ Say Y here if you want support for Texas Instruments TCAN4x5x
+ M_CAN controller. This device is a peripherial device that uses the
+ SPI bus for communication.
diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
index 057bbcdb3c74..e77f0eccff97 100644
--- a/drivers/net/can/m_can/Makefile
+++ b/drivers/net/can/m_can/Makefile
@@ -4,3 +4,4 @@
obj-$(CONFIG_CAN_M_CAN) += m_can.o
obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
+obj-$(CONFIG_CAN_M_CAN_TCAN4X5X) += tcan4x5x.o
diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
new file mode 100644
index 000000000000..9f52b298fdbf
--- /dev/null
+++ b/drivers/net/can/m_can/tcan4x5x.c
@@ -0,0 +1,533 @@
+// SPDX-License-Identifier: GPL-2.0
+// SPI to CAN driver for the Texas Instruments TCAN4x5x
+// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
+
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
+
+#include "m_can.h"
+
+#define DEVICE_NAME "tcan4x5x"
+#define TCAN4X5X_EXT_CLK_DEF 40000000
+
+#define TCAN4X5X_DEV_ID0 0x00
+#define TCAN4X5X_DEV_ID1 0x04
+#define TCAN4X5X_REV 0x08
+#define TCAN4X5X_STATUS 0x0C
+#define TCAN4X5X_ERROR_STATUS 0x10
+#define TCAN4X5X_CONTROL 0x14
+
+#define TCAN4X5X_CONFIG 0x800
+#define TCAN4X5X_TS_PRESCALE 0x804
+#define TCAN4X5X_TEST_REG 0x808
+#define TCAN4X5X_INT_FLAGS 0x820
+#define TCAN4X5X_MCAN_INT_REG 0x824
+#define TCAN4X5X_INT_EN 0x830
+
+/* Interrupt bits */
+#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30)
+#define TCAN4X5X_CANHCANL_INT_EN BIT(29)
+#define TCAN4X5X_CANHBAT_INT_EN BIT(28)
+#define TCAN4X5X_CANLGND_INT_EN BIT(27)
+#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26)
+#define TCAN4X5X_CANBUSGND_INT_EN BIT(25)
+#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24)
+#define TCAN4X5X_UVSUP_INT_EN BIT(22)
+#define TCAN4X5X_UVIO_INT_EN BIT(21)
+#define TCAN4X5X_TSD_INT_EN BIT(19)
+#define TCAN4X5X_ECCERR_INT_EN BIT(16)
+#define TCAN4X5X_CANINT_INT_EN BIT(15)
+#define TCAN4X5X_LWU_INT_EN BIT(14)
+#define TCAN4X5X_CANSLNT_INT_EN BIT(10)
+#define TCAN4X5X_CANDOM_INT_EN BIT(8)
+#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5)
+#define TCAN4X5X_BUS_FAULT BIT(4)
+#define TCAN4X5X_MCAN_INT BIT(1)
+#define TCAN4X5X_ENABLE_TCAN_INT (TCAN4X5X_MCAN_INT | \
+ TCAN4X5X_BUS_FAULT | \
+ TCAN4X5X_CANBUS_ERR_INT_EN | \
+ TCAN4X5X_CANINT_INT_EN)
+
+/* MCAN Interrupt bits */
+#define TCAN4X5X_MCAN_IR_ARA BIT(29)
+#define TCAN4X5X_MCAN_IR_PED BIT(28)
+#define TCAN4X5X_MCAN_IR_PEA BIT(27)
+#define TCAN4X5X_MCAN_IR_WD BIT(26)
+#define TCAN4X5X_MCAN_IR_BO BIT(25)
+#define TCAN4X5X_MCAN_IR_EW BIT(24)
+#define TCAN4X5X_MCAN_IR_EP BIT(23)
+#define TCAN4X5X_MCAN_IR_ELO BIT(22)
+#define TCAN4X5X_MCAN_IR_BEU BIT(21)
+#define TCAN4X5X_MCAN_IR_BEC BIT(20)
+#define TCAN4X5X_MCAN_IR_DRX BIT(19)
+#define TCAN4X5X_MCAN_IR_TOO BIT(18)
+#define TCAN4X5X_MCAN_IR_MRAF BIT(17)
+#define TCAN4X5X_MCAN_IR_TSW BIT(16)
+#define TCAN4X5X_MCAN_IR_TEFL BIT(15)
+#define TCAN4X5X_MCAN_IR_TEFF BIT(14)
+#define TCAN4X5X_MCAN_IR_TEFW BIT(13)
+#define TCAN4X5X_MCAN_IR_TEFN BIT(12)
+#define TCAN4X5X_MCAN_IR_TFE BIT(11)
+#define TCAN4X5X_MCAN_IR_TCF BIT(10)
+#define TCAN4X5X_MCAN_IR_TC BIT(9)
+#define TCAN4X5X_MCAN_IR_HPM BIT(8)
+#define TCAN4X5X_MCAN_IR_RF1L BIT(7)
+#define TCAN4X5X_MCAN_IR_RF1F BIT(6)
+#define TCAN4X5X_MCAN_IR_RF1W BIT(5)
+#define TCAN4X5X_MCAN_IR_RF1N BIT(4)
+#define TCAN4X5X_MCAN_IR_RF0L BIT(3)
+#define TCAN4X5X_MCAN_IR_RF0F BIT(2)
+#define TCAN4X5X_MCAN_IR_RF0W BIT(1)
+#define TCAN4X5X_MCAN_IR_RF0N BIT(0)
+#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \
+ TCAN4X5X_MCAN_IR_RF0N | \
+ TCAN4X5X_MCAN_IR_RF1N | \
+ TCAN4X5X_MCAN_IR_RF0F | \
+ TCAN4X5X_MCAN_IR_RF1F)
+#define TCAN4X5X_MRAM_START 0x8000
+#define TCAN4X5X_MCAN_OFFSET 0x1000
+#define TCAN4X5X_MAX_REGISTER 0x8fff
+
+#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff
+#define TCAN4X5X_SET_ALL_INT 0xffffffff
+
+#define TCAN4X5X_WRITE_CMD (0x61 << 24)
+#define TCAN4X5X_READ_CMD (0x41 << 24)
+
+#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6))
+#define TCAN4X5X_MODE_SLEEP 0x00
+#define TCAN4X5X_MODE_STANDBY BIT(6)
+#define TCAN4X5X_MODE_NORMAL BIT(7)
+
+#define TCAN4X5X_SW_RESET BIT(2)
+
+#define TCAN4X5X_MCAN_CONFIGURED BIT(5)
+#define TCAN4X5X_WATCHDOG_EN BIT(3)
+#define TCAN4X5X_WD_60_MS_TIMER 0
+#define TCAN4X5X_WD_600_MS_TIMER BIT(28)
+#define TCAN4X5X_WD_3_S_TIMER BIT(29)
+#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29))
+
+struct tcan4x5x_priv {
+ struct regmap *regmap;
+ struct spi_device *spi;
+ struct mutex tcan4x5x_lock; /* SPI device lock */
+
+ struct m_can_classdev *mcan_dev;
+
+ struct gpio_desc *reset_gpio;
+ struct gpio_desc *interrupt_gpio;
+ struct gpio_desc *device_wake_gpio;
+ struct gpio_desc *device_state_gpio;
+ struct regulator *power;
+
+ /* Register based ip */
+ int mram_start;
+ int reg_offset;
+};
+
+static struct can_bittiming_const tcan4x5x_bittiming_const = {
+ .name = DEVICE_NAME,
+ .tseg1_min = 2,
+ .tseg1_max = 31,
+ .tseg2_min = 2,
+ .tseg2_max = 16,
+ .sjw_max = 16,
+ .brp_min = 1,
+ .brp_max = 32,
+ .brp_inc = 1,
+};
+
+static struct can_bittiming_const tcan4x5x_data_bittiming_const = {
+ .name = DEVICE_NAME,
+ .tseg1_min = 1,
+ .tseg1_max = 32,
+ .tseg2_min = 1,
+ .tseg2_max = 16,
+ .sjw_max = 16,
+ .brp_min = 1,
+ .brp_max = 32,
+ .brp_inc = 1,
+};
+
+static void tcan4x5x_check_wake(struct tcan4x5x_priv *priv)
+{
+ int wake_state = 0;
+
+ if (priv->device_state_gpio)
+ wake_state = gpiod_get_value(priv->device_state_gpio);
+
+ if (priv->device_wake_gpio && wake_state) {
+ gpiod_set_value(priv->device_wake_gpio, 0);
+ usleep_range(5, 50);
+ gpiod_set_value(priv->device_wake_gpio, 1);
+ }
+}
+
+static int regmap_spi_gather_write(void *context, const void *reg,
+ size_t reg_len, const void *val,
+ size_t val_len)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+ struct spi_message m;
+ u32 addr;
+ struct spi_transfer t[2] = {
+ { .tx_buf = &addr, .len = reg_len, .cs_change = 0,},
+ { .tx_buf = val, .len = val_len, },
+ };
+
+ addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 3;
+
+ spi_message_init(&m);
+ spi_message_add_tail(&t[0], &m);
+ spi_message_add_tail(&t[1], &m);
+
+ return spi_sync(spi, &m);
+}
+
+static int tcan4x5x_regmap_write(void *context, const void *data, size_t count)
+{
+ u16 *reg = (u16 *)(data);
+ const u32 *val = data + 4;
+
+ return regmap_spi_gather_write(context, reg, 4, val, count);
+}
+
+static int regmap_spi_async_write(void *context,
+ const void *reg, size_t reg_len,
+ const void *val, size_t val_len,
+ struct regmap_async *a)
+{
+ return -ENOTSUPP;
+}
+
+static struct regmap_async *regmap_spi_async_alloc(void)
+{
+ return NULL;
+}
+
+static int tcan4x5x_regmap_read(void *context,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+
+ u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2;
+
+ return spi_write_then_read(spi, &addr, reg_size, (u32 *)val, val_size);
+}
+
+static struct regmap_bus tcan4x5x_bus = {
+ .write = tcan4x5x_regmap_write,
+ .gather_write = regmap_spi_gather_write,
+ .async_write = regmap_spi_async_write,
+ .async_alloc = regmap_spi_async_alloc,
+ .read = tcan4x5x_regmap_read,
+ .read_flag_mask = 0x00,
+ .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
+ .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+};
+
+static u32 tcan4x5x_read_reg(struct m_can_classdev *cdev, int reg)
+{
+ struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)cdev->device_data;
+ u32 val;
+
+ tcan4x5x_check_wake(priv);
+
+ regmap_read(priv->regmap, priv->reg_offset + reg, &val);
+
+ return val;
+}
+
+static u32 tcan4x5x_read_fifo(struct m_can_classdev *cdev, int addr_offset)
+{
+ struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)cdev->device_data;
+ u32 val;
+
+ tcan4x5x_check_wake(priv);
+
+ regmap_read(priv->regmap, priv->mram_start + addr_offset, &val);
+
+ return val;
+}
+
+static int tcan4x5x_write_reg(struct m_can_classdev *cdev, int reg, int val)
+{
+ struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)cdev->device_data;
+
+ tcan4x5x_check_wake(priv);
+
+ return regmap_write(priv->regmap, priv->reg_offset + reg, val);
+}
+
+static int tcan4x5x_write_fifo(struct m_can_classdev *cdev,
+ int addr_offset, int val)
+{
+ struct tcan4x5x_priv *priv =
+ (struct tcan4x5x_priv *)cdev->device_data;
+
+ tcan4x5x_check_wake(priv);
+
+ return regmap_write(priv->regmap, priv->mram_start + addr_offset, val);
+}
+
+static int tcan4x5x_power_enable(struct regulator *reg, int enable)
+{
+ if (IS_ERR_OR_NULL(reg))
+ return 0;
+
+ if (enable)
+ return regulator_enable(reg);
+ else
+ return regulator_disable(reg);
+}
+
+static int tcan4x5x_write_tcan_reg(struct m_can_classdev *cdev,
+ int reg, int val)
+{
+ struct tcan4x5x_priv *priv =
+ (struct tcan4x5x_priv *)cdev->device_data;
+
+ tcan4x5x_check_wake(priv);
+
+ return regmap_write(priv->regmap, reg, val);
+}
+
+static int tcan4x5x_clear_interrupts(struct m_can_classdev *cdev)
+{
+ struct tcan4x5x_priv *tcan4x5x =
+ (struct tcan4x5x_priv *)cdev->device_data;
+ int ret;
+
+ tcan4x5x_check_wake(tcan4x5x);
+
+ ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_STATUS,
+ TCAN4X5X_CLEAR_ALL_INT);
+ if (ret)
+ return ret;
+
+ ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_MCAN_INT_REG,
+ TCAN4X5X_ENABLE_MCAN_INT);
+ if (ret)
+ return ret;
+
+ ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_FLAGS,
+ TCAN4X5X_CLEAR_ALL_INT);
+ if (ret)
+ return ret;
+
+ ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_ERROR_STATUS,
+ TCAN4X5X_CLEAR_ALL_INT);
+ if (ret)
+ return ret;
+
+ return ret;
+}
+
+static int tcan4x5x_init(struct m_can_classdev *cdev)
+{
+ struct tcan4x5x_priv *tcan4x5x =
+ (struct tcan4x5x_priv *)cdev->device_data;
+ int ret;
+
+ tcan4x5x_check_wake(tcan4x5x);
+
+ ret = tcan4x5x_clear_interrupts(cdev);
+ if (ret)
+ return ret;
+
+ ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_EN,
+ TCAN4X5X_ENABLE_TCAN_INT);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
+ TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL);
+ if (ret)
+ return ret;
+
+ /* Zero out the MCAN buffers */
+ m_can_init_ram(cdev);
+
+ return ret;
+}
+
+static int tcan4x5x_parse_config(struct m_can_classdev *cdev)
+{
+ struct tcan4x5x_priv *tcan4x5x =
+ (struct tcan4x5x_priv *)cdev->device_data;
+
+ tcan4x5x->interrupt_gpio = devm_gpiod_get(cdev->dev, "data-ready",
+ GPIOD_IN);
+ if (IS_ERR(tcan4x5x->interrupt_gpio)) {
+ dev_err(cdev->dev, "data-ready gpio not defined\n");
+ return -EINVAL;
+ }
+
+ tcan4x5x->device_wake_gpio = devm_gpiod_get(cdev->dev, "device-wake",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(tcan4x5x->device_wake_gpio)) {
+ dev_err(cdev->dev, "device-wake gpio not defined\n");
+ return -EINVAL;
+ }
+
+ tcan4x5x->reset_gpio = devm_gpiod_get_optional(cdev->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(tcan4x5x->reset_gpio))
+ tcan4x5x->reset_gpio = NULL;
+
+ tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev,
+ "device-state",
+ GPIOD_IN);
+ if (IS_ERR(tcan4x5x->device_state_gpio))
+ tcan4x5x->device_state_gpio = NULL;
+
+ cdev->net->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio);
+
+ tcan4x5x->power = devm_regulator_get_optional(cdev->dev,
+ "vsup");
+ if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ return 0;
+}
+
+static const struct regmap_config tcan4x5x_regmap = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .cache_type = REGCACHE_NONE,
+ .max_register = TCAN4X5X_MAX_REGISTER,
+};
+
+static struct m_can_ops tcan4x5x_ops = {
+ .init = tcan4x5x_init,
+ .read_reg = tcan4x5x_read_reg,
+ .write_reg = tcan4x5x_write_reg,
+ .write_fifo = tcan4x5x_write_fifo,
+ .read_fifo = tcan4x5x_read_fifo,
+ .clear_interrupts = tcan4x5x_clear_interrupts,
+};
+
+static int tcan4x5x_can_probe(struct spi_device *spi)
+{
+ struct tcan4x5x_priv *priv;
+ struct m_can_classdev *mcan_class;
+ int freq, ret;
+
+ mcan_class = m_can_class_allocate_dev(&spi->dev);
+ priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ mcan_class->device_data = priv;
+
+ m_can_class_get_clocks(mcan_class);
+ if (IS_ERR(mcan_class->cclk)) {
+ dev_err(&spi->dev, "no CAN clock source defined\n");
+ freq = TCAN4X5X_EXT_CLK_DEF;
+ } else {
+ freq = clk_get_rate(mcan_class->cclk);
+ }
+
+ /* Sanity check */
+ if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF)
+ return -ERANGE;
+
+ priv->reg_offset = TCAN4X5X_MCAN_OFFSET;
+ priv->mram_start = TCAN4X5X_MRAM_START;
+ priv->spi = spi;
+ priv->mcan_dev = mcan_class;
+
+ mcan_class->pm_clock_support = 0;
+ mcan_class->can.clock.freq = freq;
+ mcan_class->dev = &spi->dev;
+ mcan_class->ops = &tcan4x5x_ops;
+ mcan_class->is_peripherial = true;
+ mcan_class->bit_timing = &tcan4x5x_bittiming_const;
+ mcan_class->data_timing = &tcan4x5x_data_bittiming_const;
+
+ spi_set_drvdata(spi, priv);
+
+ ret = tcan4x5x_parse_config(mcan_class);
+ if (ret)
+ goto out_clk;
+
+ /* Configure the SPI bus */
+ spi->bits_per_word = 32;
+ ret = spi_setup(spi);
+ if (ret)
+ goto out_clk;
+
+ priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus,
+ &spi->dev, &tcan4x5x_regmap);
+
+ mutex_init(&priv->tcan4x5x_lock);
+
+ tcan4x5x_power_enable(priv->power, 1);
+
+ ret = m_can_class_register(mcan_class);
+ if (ret)
+ goto out_power;
+
+ netdev_info(mcan_class->net, "TCAN4X5X successfully initialized.\n");
+ return 0;
+
+out_power:
+ tcan4x5x_power_enable(priv->power, 0);
+out_clk:
+ if (!IS_ERR(mcan_class->cclk)) {
+ clk_disable_unprepare(mcan_class->cclk);
+ clk_disable_unprepare(mcan_class->hclk);
+ }
+
+ dev_err(&spi->dev, "Probe failed, err=%d\n", ret);
+ return ret;
+}
+
+static int tcan4x5x_can_remove(struct spi_device *spi)
+{
+ struct tcan4x5x_priv *priv = spi_get_drvdata(spi);
+
+ tcan4x5x_power_enable(priv->power, 0);
+
+ m_can_class_unregister(priv->mcan_dev);
+
+ return 0;
+}
+
+static const struct of_device_id tcan4x5x_of_match[] = {
+ { .compatible = "ti,tcan4x5x", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tcan4x5x_of_match);
+
+static const struct spi_device_id tcan4x5x_id_table[] = {
+ {
+ .name = "tcan4x5x",
+ .driver_data = 0,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table);
+
+static struct spi_driver tcan4x5x_can_driver = {
+ .driver = {
+ .name = DEVICE_NAME,
+ .of_match_table = tcan4x5x_of_match,
+ .pm = NULL,
+ },
+ .id_table = tcan4x5x_id_table,
+ .probe = tcan4x5x_can_probe,
+ .remove = tcan4x5x_can_remove,
+};
+module_spi_driver(tcan4x5x_can_driver);
+
+MODULE_AUTHOR("Dan Murphy <[email protected]>");
+MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver");
+MODULE_LICENSE("GPL v2");
--
2.20.1.390.gb5101f9297
Hello Dan,
Am 12.03.19 um 13:12 schrieb Dan Murphy:
> Create a m_can platform framework that peripherial
> devices can register to and use common code and register sets.
> The peripherial devices may provide read/write and configuration
> support of the IP.
>
> Signed-off-by: Dan Murphy <[email protected]>
> ---
>
> v8 - Added a clean function for the tx_skb, cleaned up skb on BUS_OFF and on xmit
> BUSY - https://lore.kernel.org/patchwork/patch/1047980/
>
> v7 - Fixed remaining new checkpatch issues, removed CSR setting, fixed tx hard
> start function to return tx_busy, and renamed device callbacks - https://lore.kernel.org/patchwork/patch/1047220/
> v6 - Squashed platform patch to this patch for bissectablity, fixed coding style
> issues, updated Kconfig help, placed mcan reg offsets back into c file, renamed
> priv->skb to priv->tx_skb and cleared perp interrupts at ISR start -
> Patch 1 comments - https://lore.kernel.org/patchwork/patch/1042446/
> Patch 2 comments - https://lore.kernel.org/patchwork/patch/1042442/
>
> drivers/net/can/m_can/Kconfig | 13 +-
> drivers/net/can/m_can/Makefile | 1 +
> drivers/net/can/m_can/m_can.c | 717 +++++++++++++------------
> drivers/net/can/m_can/m_can.h | 110 ++++
> drivers/net/can/m_can/m_can_platform.c | 202 +++++++
> 5 files changed, 699 insertions(+), 344 deletions(-)
> create mode 100644 drivers/net/can/m_can/m_can.h
> create mode 100644 drivers/net/can/m_can/m_can_platform.c
>
> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
> index 04f20dd39007..f7119fd72df4 100644
> --- a/drivers/net/can/m_can/Kconfig
> +++ b/drivers/net/can/m_can/Kconfig
> @@ -1,5 +1,14 @@
> config CAN_M_CAN
> + tristate "Bosch M_CAN support"
> + ---help---
> + Say Y here if you want support for Bosch M_CAN controller framework.
> + This is common support for devices that embed the Bosch M_CAN IP.
> +
> +config CAN_M_CAN_PLATFORM
> + tristate "Bosch M_CAN support for io-mapped devices"
> depends on HAS_IOMEM
> - tristate "Bosch M_CAN devices"
> + depends on CAN_M_CAN
> ---help---
> - Say Y here if you want to support for Bosch M_CAN controller.
> + Say Y here if you want support for IO Mapped Bosch M_CAN controller.
> + This support is for devices that have the Bosch M_CAN controller
> + IP embedded into the device and the IP is IO Mapped to the processor.
> diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
> index 8bbd7f24f5be..057bbcdb3c74 100644
> --- a/drivers/net/can/m_can/Makefile
> +++ b/drivers/net/can/m_can/Makefile
> @@ -3,3 +3,4 @@
> #
>
> obj-$(CONFIG_CAN_M_CAN) += m_can.o
> +obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
... snip ...
> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> -static int m_can_dev_setup(struct platform_device *pdev, struct net_device *dev,
> - void __iomem *addr)
> +static int m_can_dev_setup(struct m_can_priv *m_can_dev)
> {
> - struct m_can_priv *priv;
> + struct net_device *dev = m_can_dev->net;
> int m_can_version;
>
> - m_can_version = m_can_check_core_release(addr);
> + m_can_version = m_can_check_core_release(m_can_dev);
What is m_can_version for the tcan4x5x?
... snip ...
Wolfgang.
Wolfgang
On 3/12/19 7:43 AM, Wolfgang Grandegger wrote:
> Hello Dan,
>
> Am 12.03.19 um 13:12 schrieb Dan Murphy:
>> Create a m_can platform framework that peripherial
>> devices can register to and use common code and register sets.
>> The peripherial devices may provide read/write and configuration
>> support of the IP.
>>
>> Signed-off-by: Dan Murphy <[email protected]>
>> ---
>>
>> v8 - Added a clean function for the tx_skb, cleaned up skb on BUS_OFF and on xmit
>> BUSY - https://lore.kernel.org/patchwork/patch/1047980/
>>
>> v7 - Fixed remaining new checkpatch issues, removed CSR setting, fixed tx hard
>> start function to return tx_busy, and renamed device callbacks - https://lore.kernel.org/patchwork/patch/1047220/
>> v6 - Squashed platform patch to this patch for bissectablity, fixed coding style
>> issues, updated Kconfig help, placed mcan reg offsets back into c file, renamed
>> priv->skb to priv->tx_skb and cleared perp interrupts at ISR start -
>> Patch 1 comments - https://lore.kernel.org/patchwork/patch/1042446/
>> Patch 2 comments - https://lore.kernel.org/patchwork/patch/1042442/
>>
>> drivers/net/can/m_can/Kconfig | 13 +-
>> drivers/net/can/m_can/Makefile | 1 +
>> drivers/net/can/m_can/m_can.c | 717 +++++++++++++------------
>> drivers/net/can/m_can/m_can.h | 110 ++++
>> drivers/net/can/m_can/m_can_platform.c | 202 +++++++
>> 5 files changed, 699 insertions(+), 344 deletions(-)
>> create mode 100644 drivers/net/can/m_can/m_can.h
>> create mode 100644 drivers/net/can/m_can/m_can_platform.c
>>
>> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
>> index 04f20dd39007..f7119fd72df4 100644
>> --- a/drivers/net/can/m_can/Kconfig
>> +++ b/drivers/net/can/m_can/Kconfig
>> @@ -1,5 +1,14 @@
>> config CAN_M_CAN
>> + tristate "Bosch M_CAN support"
>> + ---help---
>> + Say Y here if you want support for Bosch M_CAN controller framework.
>> + This is common support for devices that embed the Bosch M_CAN IP.
>> +
>> +config CAN_M_CAN_PLATFORM
>> + tristate "Bosch M_CAN support for io-mapped devices"
>> depends on HAS_IOMEM
>> - tristate "Bosch M_CAN devices"
>> + depends on CAN_M_CAN
>> ---help---
>> - Say Y here if you want to support for Bosch M_CAN controller.
>> + Say Y here if you want support for IO Mapped Bosch M_CAN controller.
>> + This support is for devices that have the Bosch M_CAN controller
>> + IP embedded into the device and the IP is IO Mapped to the processor.
>> diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
>> index 8bbd7f24f5be..057bbcdb3c74 100644
>> --- a/drivers/net/can/m_can/Makefile
>> +++ b/drivers/net/can/m_can/Makefile
>> @@ -3,3 +3,4 @@
>> #
>>
>> obj-$(CONFIG_CAN_M_CAN) += m_can.o
>> +obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
>
> ... snip ...
>
>> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
>> -static int m_can_dev_setup(struct platform_device *pdev, struct net_device *dev,
>> - void __iomem *addr)
>> +static int m_can_dev_setup(struct m_can_priv *m_can_dev)
>> {
>> - struct m_can_priv *priv;
>> + struct net_device *dev = m_can_dev->net;
>> int m_can_version;
>>
>> - m_can_version = m_can_check_core_release(addr);
>> + m_can_version = m_can_check_core_release(m_can_dev);
>
> What is m_can_version for the tcan4x5x?
>
I believe it is Bosch M-CAN Revision 3.2.1.1
> ... snip ...
>
> Wolfgang.
>
--
------------------
Dan Murphy
Hello Dan,
in the previous email you said that the tcan4x5x uses:
Bosch M-CAN Revision 3.2.1.1
This means "cdev->version == 32", hence it's using FIFOs...
Am 12.03.19 um 13:12 schrieb Dan Murphy:
> Create a m_can platform framework that peripherial
> devices can register to and use common code and register sets.
> The peripherial devices may provide read/write and configuration
> support of the IP.
>
> Signed-off-by: Dan Murphy <[email protected]>
> ---
>
> v8 - Added a clean function for the tx_skb, cleaned up skb on BUS_OFF and on xmit
> BUSY - https://lore.kernel.org/patchwork/patch/1047980/
>
> v7 - Fixed remaining new checkpatch issues, removed CSR setting, fixed tx hard
> start function to return tx_busy, and renamed device callbacks - https://lore.kernel.org/patchwork/patch/1047220/
> v6 - Squashed platform patch to this patch for bissectablity, fixed coding style
> issues, updated Kconfig help, placed mcan reg offsets back into c file, renamed
> priv->skb to priv->tx_skb and cleared perp interrupts at ISR start -
> Patch 1 comments - https://lore.kernel.org/patchwork/patch/1042446/
> Patch 2 comments - https://lore.kernel.org/patchwork/patch/1042442/
>
> drivers/net/can/m_can/Kconfig | 13 +-
> drivers/net/can/m_can/Makefile | 1 +
> drivers/net/can/m_can/m_can.c | 717 +++++++++++++------------
> drivers/net/can/m_can/m_can.h | 110 ++++
> drivers/net/can/m_can/m_can_platform.c | 202 +++++++
> 5 files changed, 699 insertions(+), 344 deletions(-)
> create mode 100644 drivers/net/can/m_can/m_can.h
> create mode 100644 drivers/net/can/m_can/m_can_platform.c
>
> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
> index 04f20dd39007..f7119fd72df4 100644
> --- a/drivers/net/can/m_can/Kconfig
> +++ b/drivers/net/can/m_can/Kconfig
> @@ -1,5 +1,14 @@
> config CAN_M_CAN
> + tristate "Bosch M_CAN support"
> + ---help---
> + Say Y here if you want support for Bosch M_CAN controller framework.
> + This is common support for devices that embed the Bosch M_CAN IP.
> +
> +config CAN_M_CAN_PLATFORM
> + tristate "Bosch M_CAN support for io-mapped devices"
> depends on HAS_IOMEM
> - tristate "Bosch M_CAN devices"
> + depends on CAN_M_CAN
> ---help---
> - Say Y here if you want to support for Bosch M_CAN controller.
> + Say Y here if you want support for IO Mapped Bosch M_CAN controller.
> + This support is for devices that have the Bosch M_CAN controller
> + IP embedded into the device and the IP is IO Mapped to the processor.
> diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
> index 8bbd7f24f5be..057bbcdb3c74 100644
> --- a/drivers/net/can/m_can/Makefile
> +++ b/drivers/net/can/m_can/Makefile
> @@ -3,3 +3,4 @@
> #
>
> obj-$(CONFIG_CAN_M_CAN) += m_can.o
> +obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> index 9b449400376b..f2231fb02525 100644
> --- a/drivers/net/can/m_can/m_can.c
> +++ b/drivers/net/can/m_can/m_can.c
> @@ -1,20 +1,14 @@
> -/*
> - * CAN bus driver for Bosch M_CAN controller
> - *
> - * Copyright (C) 2014 Freescale Semiconductor, Inc.
> - * Dong Aisheng <[email protected]>
> - *
> - * Bosch M_CAN user manual can be obtained from:
> +// SPDX-License-Identifier: GPL-2.0
> +// CAN bus driver for Bosch M_CAN controller
> +// Copyright (C) 2014 Freescale Semiconductor, Inc.
> +// Dong Aisheng <[email protected]>
> +// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
> +
> +/* Bosch M_CAN user manual can be obtained from:
> * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/
> * mcan_users_manual_v302.pdf
> - *
> - * This file is licensed under the terms of the GNU General Public
> - * License version 2. This program is licensed "as is" without any
> - * warranty of any kind, whether express or implied.
> */
>
> -#include <linux/clk.h>
> -#include <linux/delay.h>
> #include <linux/interrupt.h>
> #include <linux/io.h>
> #include <linux/kernel.h>
> @@ -28,11 +22,7 @@
> #include <linux/can/dev.h>
> #include <linux/pinctrl/consumer.h>
>
> -/* napi related */
> -#define M_CAN_NAPI_WEIGHT 64
> -
> -/* message ram configuration data length */
> -#define MRAM_CFG_LEN 8
> +#include "m_can.h"
>
> /* registers definition */
> enum m_can_reg {
> @@ -86,28 +76,11 @@ enum m_can_reg {
> M_CAN_TXEFA = 0xf8,
> };
>
> -/* m_can lec values */
> -enum m_can_lec_type {
> - LEC_NO_ERROR = 0,
> - LEC_STUFF_ERROR,
> - LEC_FORM_ERROR,
> - LEC_ACK_ERROR,
> - LEC_BIT1_ERROR,
> - LEC_BIT0_ERROR,
> - LEC_CRC_ERROR,
> - LEC_UNUSED,
> -};
> +/* napi related */
> +#define M_CAN_NAPI_WEIGHT 64
>
> -enum m_can_mram_cfg {
> - MRAM_SIDF = 0,
> - MRAM_XIDF,
> - MRAM_RXF0,
> - MRAM_RXF1,
> - MRAM_RXB,
> - MRAM_TXE,
> - MRAM_TXB,
> - MRAM_CFG_NUM,
> -};
> +/* message ram configuration data length */
> +#define MRAM_CFG_LEN 8
>
> /* Core Release Register (CREL) */
> #define CREL_REL_SHIFT 28
> @@ -347,68 +320,72 @@ enum m_can_mram_cfg {
> #define TX_EVENT_MM_SHIFT TX_BUF_MM_SHIFT
> #define TX_EVENT_MM_MASK (0xff << TX_EVENT_MM_SHIFT)
>
> -/* address offset and element number for each FIFO/Buffer in the Message RAM */
> -struct mram_cfg {
> - u16 off;
> - u8 num;
> -};
> -
> -/* m_can private data structure */
> -struct m_can_priv {
> - struct can_priv can; /* must be the first member */
> - struct napi_struct napi;
> - struct net_device *dev;
> - struct device *device;
> - struct clk *hclk;
> - struct clk *cclk;
> - void __iomem *base;
> - u32 irqstatus;
> - int version;
> -
> - /* message ram configuration */
> - void __iomem *mram_base;
> - struct mram_cfg mcfg[MRAM_CFG_NUM];
> -};
> +static u32 m_can_read(struct m_can_priv *priv, enum m_can_reg reg)
> +{
> + if (priv->ops->read_reg)
> + return priv->ops->read_reg(priv, reg);
> + else
> + return -EINVAL;
> +}
>
> -static inline u32 m_can_read(const struct m_can_priv *priv, enum m_can_reg reg)
> +static int m_can_write(struct m_can_priv *priv, enum m_can_reg reg, u32 val)
> {
> - return readl(priv->base + reg);
> + if (priv->ops->write_reg)
> + return priv->ops->write_reg(priv, reg, val);
> + else
> + return -EINVAL;
> }
>
> -static inline void m_can_write(const struct m_can_priv *priv,
> - enum m_can_reg reg, u32 val)
> +static u32 m_can_fifo_read(struct m_can_priv *priv,
> + u32 fgi, unsigned int offset)
> {
> - writel(val, priv->base + reg);
> + u32 addr_offset = priv->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE +
> + offset;
> +
> + if (priv->ops->read_fifo)
> + return priv->ops->read_fifo(priv, addr_offset);
> + else
> + return -EINVAL;
> }
>
> -static inline u32 m_can_fifo_read(const struct m_can_priv *priv,
> - u32 fgi, unsigned int offset)
> +static u32 m_can_fifo_write(struct m_can_priv *priv,
> + u32 fpi, unsigned int offset, u32 val)
> {
> - return readl(priv->mram_base + priv->mcfg[MRAM_RXF0].off +
> - fgi * RXF0_ELEMENT_SIZE + offset);
> + u32 addr_offset = priv->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE +
> + offset;
> +
> + if (priv->ops->write_fifo)
> + return priv->ops->write_fifo(priv, addr_offset, val);
> + else
> + return -EINVAL;
> }
>
> -static inline void m_can_fifo_write(const struct m_can_priv *priv,
> - u32 fpi, unsigned int offset, u32 val)
> +static u32 m_can_fifo_write_no_off(struct m_can_priv *priv,
> + u32 fpi, u32 val)
> {
> - writel(val, priv->mram_base + priv->mcfg[MRAM_TXB].off +
> - fpi * TXB_ELEMENT_SIZE + offset);
> + if (priv->ops->write_fifo)
> + return priv->ops->write_fifo(priv, fpi, val);
> + else
> + return 0;
> }
>
> -static inline u32 m_can_txe_fifo_read(const struct m_can_priv *priv,
> - u32 fgi,
> - u32 offset) {
> - return readl(priv->mram_base + priv->mcfg[MRAM_TXE].off +
> - fgi * TXE_ELEMENT_SIZE + offset);
> +static u32 m_can_txe_fifo_read(struct m_can_priv *priv, u32 fgi, u32 offset)
> +{
> + u32 addr_offset = priv->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE +
> + offset;
> +
> + if (priv->ops->read_fifo)
> + return priv->ops->read_fifo(priv, addr_offset);
> + else
> + return -EINVAL;
> }
>
> -static inline bool m_can_tx_fifo_full(const struct m_can_priv *priv)
> +static inline bool m_can_tx_fifo_full(struct m_can_priv *priv)
> {
> return !!(m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQF);
> }
>
> -static inline void m_can_config_endisable(const struct m_can_priv *priv,
> - bool enable)
> +void m_can_config_endisable(struct m_can_priv *priv, bool enable)
> {
> u32 cccr = m_can_read(priv, M_CAN_CCCR);
> u32 timeout = 10;
> @@ -430,7 +407,7 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
>
> while ((m_can_read(priv, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) {
> if (timeout == 0) {
> - netdev_warn(priv->dev, "Failed to init module\n");
> + netdev_warn(priv->net, "Failed to init module\n");
> return;
> }
> timeout--;
> @@ -438,17 +415,29 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
> }
> }
>
> -static inline void m_can_enable_all_interrupts(const struct m_can_priv *priv)
> +static inline void m_can_enable_all_interrupts(struct m_can_priv *priv)
> {
> /* Only interrupt line 0 is used in this driver */
> m_can_write(priv, M_CAN_ILE, ILE_EINT0);
> }
>
> -static inline void m_can_disable_all_interrupts(const struct m_can_priv *priv)
> +static inline void m_can_disable_all_interrupts(struct m_can_priv *priv)
> {
> m_can_write(priv, M_CAN_ILE, 0x0);
> }
>
> +static void m_can_clean(struct net_device *net)
> +{
> + struct m_can_priv *priv = netdev_priv(net);
> +
> + if (priv->tx_skb) {
> + net->stats.tx_errors++;
> + dev_kfree_skb(priv->tx_skb);
> + can_free_echo_skb(priv->net, 0);
I think this frees the skb twice!
Also, the index depends on "cdev->version"! If > 30, the last used index
should be selected.
> + priv->tx_skb = NULL;
> + }
> +}
> +
> static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
> {
> struct net_device_stats *stats = &dev->stats;
> @@ -633,9 +622,12 @@ static int m_can_clk_start(struct m_can_priv *priv)
> {
> int err;
>
> - err = pm_runtime_get_sync(priv->device);
> + if (priv->pm_clock_support == 0)
> + return 0;
> +
> + err = pm_runtime_get_sync(priv->dev);
> if (err < 0) {
> - pm_runtime_put_noidle(priv->device);
> + pm_runtime_put_noidle(priv->dev);
> return err;
> }
>
> @@ -644,7 +636,8 @@ static int m_can_clk_start(struct m_can_priv *priv)
>
> static void m_can_clk_stop(struct m_can_priv *priv)
> {
> - pm_runtime_put_sync(priv->device);
> + if (priv->pm_clock_support)
> + pm_runtime_put_sync(priv->dev);
> }
>
> static int m_can_get_berr_counter(const struct net_device *dev,
> @@ -811,9 +804,8 @@ static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
> return work_done;
> }
>
> -static int m_can_poll(struct napi_struct *napi, int quota)
> +static int m_can_rx_handler(struct net_device *dev, int quota)
> {
> - struct net_device *dev = napi->dev;
> struct m_can_priv *priv = netdev_priv(dev);
> int work_done = 0;
> u32 irqstatus, psr;
> @@ -831,13 +823,33 @@ static int m_can_poll(struct napi_struct *napi, int quota)
>
> if (irqstatus & IR_RF0N)
> work_done += m_can_do_rx_poll(dev, (quota - work_done));
> +end:
> + return work_done;
> +}
> +
> +static int m_can_rx_peripherial(struct net_device *dev)
> +{
> + struct m_can_priv *priv = netdev_priv(dev);
> +
> + m_can_rx_handler(dev, 1);
> +
> + m_can_enable_all_interrupts(priv);
>
> + return 0;
> +}
> +
> +static int m_can_poll(struct napi_struct *napi, int quota)
> +{
> + struct net_device *dev = napi->dev;
> + struct m_can_priv *priv = netdev_priv(dev);
> + int work_done;
> +
> + work_done = m_can_rx_handler(dev, quota);
> if (work_done < quota) {
> napi_complete_done(napi, work_done);
> m_can_enable_all_interrupts(priv);
> }
>
> -end:
> return work_done;
> }
>
> @@ -894,6 +906,9 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
> if (ir & IR_ALL_INT)
> m_can_write(priv, M_CAN_IR, ir);
>
> + if (priv->ops->clear_interrupts)
> + priv->ops->clear_interrupts(priv);
> +
> /* schedule NAPI in case of
> * - rx IRQ
> * - state change IRQ
> @@ -902,7 +917,10 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
> if ((ir & IR_RF0N) || (ir & IR_ERR_ALL_30X)) {
> priv->irqstatus = ir;
> m_can_disable_all_interrupts(priv);
> - napi_schedule(&priv->napi);
> + if (!priv->is_peripherial)
> + napi_schedule(&priv->napi);
> + else
> + m_can_rx_peripherial(dev);
> }
>
> if (priv->version == 30) {
> @@ -1155,6 +1173,9 @@ static void m_can_chip_config(struct net_device *dev)
> m_can_set_bittiming(dev);
>
> m_can_config_endisable(priv, false);
> +
> + if (priv->ops->init)
> + priv->ops->init(priv);
> }
>
> static void m_can_start(struct net_device *dev)
> @@ -1173,6 +1194,7 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
> {
> switch (mode) {
> case CAN_MODE_START:
> + m_can_clean(dev);
> m_can_start(dev);
> netif_wake_queue(dev);
> break;
> @@ -1188,20 +1210,17 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
> * else it returns the release and step coded as:
> * return value = 10 * <release> + 1 * <step>
> */
> -static int m_can_check_core_release(void __iomem *m_can_base)
> +static int m_can_check_core_release(struct m_can_priv *priv)
> {
> u32 crel_reg;
> u8 rel;
> u8 step;
> int res;
> - struct m_can_priv temp_priv = {
> - .base = m_can_base
> - };
>
> /* Read Core Release Version and split into version number
> * Example: Version 3.2.1 => rel = 3; step = 2; substep = 1;
> */
> - crel_reg = m_can_read(&temp_priv, M_CAN_CREL);
> + crel_reg = m_can_read(priv, M_CAN_CREL);
> rel = (u8)((crel_reg & CREL_REL_MASK) >> CREL_REL_SHIFT);
> step = (u8)((crel_reg & CREL_STEP_MASK) >> CREL_STEP_SHIFT);
>
> @@ -1219,18 +1238,26 @@ static int m_can_check_core_release(void __iomem *m_can_base)
> /* Selectable Non ISO support only in version 3.2.x
> * This function checks if the bit is writable.
> */
> -static bool m_can_niso_supported(const struct m_can_priv *priv)
> +static bool m_can_niso_supported(struct m_can_priv *priv)
> {
> - u32 cccr_reg, cccr_poll;
> - int niso_timeout;
> + u32 cccr_reg, cccr_poll = 0;
> + int niso_timeout = -ETIMEDOUT;
> + int i;
>
> m_can_config_endisable(priv, true);
> cccr_reg = m_can_read(priv, M_CAN_CCCR);
> cccr_reg |= CCCR_NISO;
> m_can_write(priv, M_CAN_CCCR, cccr_reg);
>
> - niso_timeout = readl_poll_timeout((priv->base + M_CAN_CCCR), cccr_poll,
> - (cccr_poll == cccr_reg), 0, 10);
> + for (i = 0; i <= 10; i++) {
> + cccr_poll = m_can_read(priv, M_CAN_CCCR);
> + if (cccr_poll == cccr_reg) {
> + niso_timeout = 0;
> + break;
> + }
> +
> + usleep_range(1, 5);
> + }
>
> /* Clear NISO */
> cccr_reg &= ~(CCCR_NISO);
> @@ -1242,107 +1269,79 @@ static bool m_can_niso_supported(const struct m_can_priv *priv)
> return !niso_timeout;
> }
>
> -static int m_can_dev_setup(struct platform_device *pdev, struct net_device *dev,
> - void __iomem *addr)
> +static int m_can_dev_setup(struct m_can_priv *m_can_dev)
> {
> - struct m_can_priv *priv;
> + struct net_device *dev = m_can_dev->net;
> int m_can_version;
>
> - m_can_version = m_can_check_core_release(addr);
> + m_can_version = m_can_check_core_release(m_can_dev);
> /* return if unsupported version */
> if (!m_can_version) {
> - dev_err(&pdev->dev, "Unsupported version number: %2d",
> + dev_err(m_can_dev->dev, "Unsupported version number: %2d",
> m_can_version);
> return -EINVAL;
> }
>
> - priv = netdev_priv(dev);
> - netif_napi_add(dev, &priv->napi, m_can_poll, M_CAN_NAPI_WEIGHT);
> + if (!m_can_dev->is_peripherial)
> + netif_napi_add(dev, &m_can_dev->napi,
> + m_can_poll, M_CAN_NAPI_WEIGHT);
>
> /* Shared properties of all M_CAN versions */
> - priv->version = m_can_version;
> - priv->dev = dev;
> - priv->base = addr;
> - priv->can.do_set_mode = m_can_set_mode;
> - priv->can.do_get_berr_counter = m_can_get_berr_counter;
> + m_can_dev->version = m_can_version;
> + m_can_dev->can.do_set_mode = m_can_set_mode;
> + m_can_dev->can.do_get_berr_counter = m_can_get_berr_counter;
>
> /* Set M_CAN supported operations */
> - priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
> + m_can_dev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
> CAN_CTRLMODE_LISTENONLY |
> CAN_CTRLMODE_BERR_REPORTING |
> CAN_CTRLMODE_FD;
>
> /* Set properties depending on M_CAN version */
> - switch (priv->version) {
> + switch (m_can_dev->version) {
> case 30:
> /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.x */
> can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
> - priv->can.bittiming_const = &m_can_bittiming_const_30X;
> - priv->can.data_bittiming_const =
> - &m_can_data_bittiming_const_30X;
> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
> + m_can_dev->bit_timing : &m_can_bittiming_const_30X;
> +
> + m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
> + m_can_dev->data_timing :
> + &m_can_data_bittiming_const_30X;
> break;
> case 31:
> /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.1.x */
> can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
> - priv->can.bittiming_const = &m_can_bittiming_const_31X;
> - priv->can.data_bittiming_const =
> - &m_can_data_bittiming_const_31X;
> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
> + m_can_dev->bit_timing : &m_can_bittiming_const_31X;
> +
> + m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
> + m_can_dev->data_timing :
> + &m_can_data_bittiming_const_31X;
> break;
> case 32:
> - priv->can.bittiming_const = &m_can_bittiming_const_31X;
> - priv->can.data_bittiming_const =
> - &m_can_data_bittiming_const_31X;
> - priv->can.ctrlmode_supported |= (m_can_niso_supported(priv)
> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
> + m_can_dev->bit_timing : &m_can_bittiming_const_31X;
> +
> + m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
> + m_can_dev->data_timing :
> + &m_can_data_bittiming_const_31X;
> +
> + m_can_dev->can.ctrlmode_supported |=
> + (m_can_niso_supported(m_can_dev)
> ? CAN_CTRLMODE_FD_NON_ISO
> : 0);
> break;
> default:
> - dev_err(&pdev->dev, "Unsupported version number: %2d",
> - priv->version);
> + dev_err(m_can_dev->dev, "Unsupported version number: %2d",
> + m_can_dev->version);
> return -EINVAL;
> }
>
> - return 0;
> -}
> -
> -static int m_can_open(struct net_device *dev)
> -{
> - struct m_can_priv *priv = netdev_priv(dev);
> - int err;
> -
> - err = m_can_clk_start(priv);
> - if (err)
> - return err;
> -
> - /* open the can device */
> - err = open_candev(dev);
> - if (err) {
> - netdev_err(dev, "failed to open can device\n");
> - goto exit_disable_clks;
> - }
> -
> - /* register interrupt handler */
> - err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
> - dev);
> - if (err < 0) {
> - netdev_err(dev, "failed to request interrupt\n");
> - goto exit_irq_fail;
> - }
> -
> - /* start the m_can controller */
> - m_can_start(dev);
> -
> - can_led_event(dev, CAN_LED_EVENT_OPEN);
> - napi_enable(&priv->napi);
> - netif_start_queue(dev);
> + if (m_can_dev->ops->init)
> + m_can_dev->ops->init(m_can_dev);
>
> return 0;
> -
> -exit_irq_fail:
> - close_candev(dev);
> -exit_disable_clks:
> - m_can_clk_stop(priv);
> - return err;
> }
>
> static void m_can_stop(struct net_device *dev)
> @@ -1361,10 +1360,18 @@ static int m_can_close(struct net_device *dev)
> struct m_can_priv *priv = netdev_priv(dev);
>
> netif_stop_queue(dev);
> - napi_disable(&priv->napi);
> + if (!priv->is_peripherial)
> + napi_disable(&priv->napi);
> m_can_stop(dev);
> m_can_clk_stop(priv);
> free_irq(dev->irq, dev);
> +
> + if (priv->is_peripherial) {
> + priv->tx_skb = NULL;
> + destroy_workqueue(priv->tx_wq);
> + priv->tx_wq = NULL;
> + }
> +
> close_candev(dev);
> can_led_event(dev, CAN_LED_EVENT_STOP);
>
> @@ -1385,18 +1392,15 @@ static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx)
> return !!priv->can.echo_skb[next_idx];
> }
>
> -static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> - struct net_device *dev)
> +static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> - struct canfd_frame *cf = (struct canfd_frame *)skb->data;
> + struct canfd_frame *cf = (struct canfd_frame *)priv->tx_skb->data;
> + struct net_device *dev = priv->net;
> + struct sk_buff *skb = priv->tx_skb;
> u32 id, cccr, fdflags;
> int i;
> int putidx;
>
> - if (can_dropped_invalid_skb(dev, skb))
> - return NETDEV_TX_OK;
> -
> /* Generate ID field for TX buffer Element */
> /* Common to all supported M_CAN versions */
> if (cf->can_id & CAN_EFF_FLAG) {
> @@ -1492,14 +1496,117 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> m_can_write(priv, M_CAN_TXBAR, (1 << putidx));
>
> /* stop network queue if fifo full */
> - if (m_can_tx_fifo_full(priv) ||
> - m_can_next_echo_skb_occupied(dev, putidx))
> - netif_stop_queue(dev);
> + if (m_can_tx_fifo_full(priv) ||
> + m_can_next_echo_skb_occupied(dev, putidx))
> + netif_stop_queue(dev);
> + }
> +
> + return NETDEV_TX_OK;
> +}
> +
> +static void m_can_tx_work_queue(struct work_struct *ws)
> +{
> + struct m_can_priv *priv = container_of(ws, struct m_can_priv,
> + tx_work);
> + netdev_tx_t ret;
> +
> + ret = m_can_tx_handler(priv);
> + if (ret == NETDEV_TX_OK)
> + priv->tx_skb = NULL;
What happens to the "tx_skb" if this funtions returns with
NETDEV_TX_BUSY? Will it be freed?
> +}
> +
> +static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> + struct net_device *dev)
> +{
> + struct m_can_priv *priv = netdev_priv(dev);
> +
> + if (can_dropped_invalid_skb(dev, skb))
> + return NETDEV_TX_OK;
> +
> + if (priv->is_peripherial) {
> + if (priv->tx_skb) {
> + netdev_err(dev, "hard_xmit called while tx busy\n");
> + return NETDEV_TX_BUSY;
> + }
> +
> + if (priv->can.state == CAN_STATE_BUS_OFF) {
> + m_can_clean(dev);
> + } else {
> + priv->tx_skb = skb;
> + netif_stop_queue(priv->net);
You stop the queue immediately, even if fifos are used. Is this by purpose?
> + queue_work(priv->tx_wq, &priv->tx_work);
> + }
> + } else {
> + priv->tx_skb = skb;
> + return m_can_tx_handler(priv);
> }
>
> return NETDEV_TX_OK;
> }
>
> +static int m_can_open(struct net_device *dev)
> +{
> + struct m_can_priv *priv = netdev_priv(dev);
> + int err;
> +
> + err = m_can_clk_start(priv);
> + if (err)
> + return err;
> +
> + /* open the can device */
> + err = open_candev(dev);
> + if (err) {
> + netdev_err(dev, "failed to open can device\n");
> + goto exit_disable_clks;
> + }
> +
> + /* register interrupt handler */
> + if (priv->is_peripherial) {
> + priv->tx_skb = NULL;
> + priv->tx_wq = alloc_workqueue("mcan_wq",
> + WQ_FREEZABLE | WQ_MEM_RECLAIM, 0);
> + if (!priv->tx_wq) {
> + err = -ENOMEM;
> + goto out_wq_fail;
> + }
> +
> + INIT_WORK(&priv->tx_work, m_can_tx_work_queue);
> +
> + err = request_threaded_irq(dev->irq, NULL, m_can_isr,
> + IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
> + dev->name, dev);
> + } else {
> + err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
> + dev);
> + }
> +
> + if (err < 0) {
> + netdev_err(dev, "failed to request interrupt\n");
> + goto exit_irq_fail;
> + }
> +
> + /* start the m_can controller */
> + m_can_start(dev);
> +
> + can_led_event(dev, CAN_LED_EVENT_OPEN);
> +
> + if (!priv->is_peripherial)
> + napi_enable(&priv->napi);
> +
> + netif_start_queue(dev);
> +
> + return 0;
> +
> +exit_irq_fail:
> + if (priv->is_peripherial)
> + destroy_workqueue(priv->tx_wq);
> +out_wq_fail:
> + close_candev(dev);
> +exit_disable_clks:
> + m_can_clk_stop(priv);
> + return err;
> +}
> +
> static const struct net_device_ops m_can_netdev_ops = {
> .ndo_open = m_can_open,
> .ndo_stop = m_can_close,
> @@ -1515,20 +1622,6 @@ static int register_m_can_dev(struct net_device *dev)
> return register_candev(dev);
> }
>
> -static void m_can_init_ram(struct m_can_priv *priv)
> -{
> - int end, i, start;
> -
> - /* initialize the entire Message RAM in use to avoid possible
> - * ECC/parity checksum errors when reading an uninitialized buffer
> - */
> - start = priv->mcfg[MRAM_SIDF].off;
> - end = priv->mcfg[MRAM_TXB].off +
> - priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
> - for (i = start; i < end; i += 4)
> - writel(0x0, priv->mram_base + i);
> -}
> -
> static void m_can_of_parse_mram(struct m_can_priv *priv,
> const u32 *mram_config_vals)
> {
> @@ -1556,9 +1649,8 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
> priv->mcfg[MRAM_TXB].num = mram_config_vals[7] &
> (TXBC_NDTB_MASK >> TXBC_NDTB_SHIFT);
>
> - dev_dbg(priv->device,
> - "mram_base %p sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
> - priv->mram_base,
> + dev_dbg(priv->dev,
> + "sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
> priv->mcfg[MRAM_SIDF].off, priv->mcfg[MRAM_SIDF].num,
> priv->mcfg[MRAM_XIDF].off, priv->mcfg[MRAM_XIDF].num,
> priv->mcfg[MRAM_RXF0].off, priv->mcfg[MRAM_RXF0].num,
> @@ -1566,63 +1658,55 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
> priv->mcfg[MRAM_RXB].off, priv->mcfg[MRAM_RXB].num,
> priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num,
> priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num);
> -
> - m_can_init_ram(priv);
> }
>
> -static int m_can_plat_probe(struct platform_device *pdev)
> +void m_can_init_ram(struct m_can_priv *priv)
> {
> - struct net_device *dev;
> - struct m_can_priv *priv;
> - struct resource *res;
> - void __iomem *addr;
> - void __iomem *mram_addr;
> - struct clk *hclk, *cclk;
> - int irq, ret;
> - struct device_node *np;
> - u32 mram_config_vals[MRAM_CFG_LEN];
> - u32 tx_fifo_size;
> -
> - np = pdev->dev.of_node;
> + int end, i, start;
>
> - hclk = devm_clk_get(&pdev->dev, "hclk");
> - cclk = devm_clk_get(&pdev->dev, "cclk");
> + /* initialize the entire Message RAM in use to avoid possible
> + * ECC/parity checksum errors when reading an uninitialized buffer
> + */
> + start = priv->mcfg[MRAM_SIDF].off;
> + end = priv->mcfg[MRAM_TXB].off +
> + priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
>
> - if (IS_ERR(hclk) || IS_ERR(cclk)) {
> - dev_err(&pdev->dev, "no clock found\n");
> - ret = -ENODEV;
> - goto failed_ret;
> - }
> + for (i = start; i < end; i += 4)
> + m_can_fifo_write_no_off(priv, i, 0x0);
> +}
> +EXPORT_SYMBOL_GPL(m_can_init_ram);
>
> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
> - addr = devm_ioremap_resource(&pdev->dev, res);
> - irq = platform_get_irq_byname(pdev, "int0");
> +int m_can_class_get_clocks(struct m_can_priv *m_can_dev)
> +{
> + int ret = 0;
>
> - if (IS_ERR(addr) || irq < 0) {
> - ret = -EINVAL;
> - goto failed_ret;
> - }
> + m_can_dev->hclk = devm_clk_get(m_can_dev->dev, "hclk");
> + m_can_dev->cclk = devm_clk_get(m_can_dev->dev, "cclk");
>
> - /* message ram could be shared */
> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
> - if (!res) {
> + if (IS_ERR(m_can_dev->cclk)) {
> + dev_err(m_can_dev->dev, "no clock found\n");
> ret = -ENODEV;
> - goto failed_ret;
> }
>
> - mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> - if (!mram_addr) {
> - ret = -ENOMEM;
> - goto failed_ret;
> - }
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(m_can_class_get_clocks);
>
> - /* get message ram configuration */
> - ret = of_property_read_u32_array(np, "bosch,mram-cfg",
> - mram_config_vals,
> - sizeof(mram_config_vals) / 4);
> +struct m_can_priv *m_can_class_allocate_dev(struct device *dev)
> +{
> + struct m_can_priv *class_dev = NULL;
> + u32 mram_config_vals[MRAM_CFG_LEN];
> + struct net_device *net_dev;
> + u32 tx_fifo_size;
> + int ret;
> +
> + ret = fwnode_property_read_u32_array(dev_fwnode(dev),
> + "bosch,mram-cfg",
> + mram_config_vals,
> + sizeof(mram_config_vals) / 4);
> if (ret) {
> - dev_err(&pdev->dev, "Could not get Message RAM configuration.");
> - goto failed_ret;
> + dev_err(dev, "Could not get Message RAM configuration.");
> + goto out;
> }
>
> /* Get TX FIFO size
> @@ -1631,66 +1715,74 @@ static int m_can_plat_probe(struct platform_device *pdev)
> tx_fifo_size = mram_config_vals[7];
>
> /* allocate the m_can device */
> - dev = alloc_candev(sizeof(*priv), tx_fifo_size);
> - if (!dev) {
> - ret = -ENOMEM;
> - goto failed_ret;
> + net_dev = alloc_candev(sizeof(*class_dev), tx_fifo_size);
> + if (!net_dev) {
> + dev_err(dev, "Failed to allocate CAN device");
> + goto out;
> + }
> +
> + class_dev = netdev_priv(net_dev);
> + if (!class_dev) {
> + dev_err(dev, "Failed to init netdev private");
> + goto out;
> }
>
> - priv = netdev_priv(dev);
> - dev->irq = irq;
> - priv->device = &pdev->dev;
> - priv->hclk = hclk;
> - priv->cclk = cclk;
> - priv->can.clock.freq = clk_get_rate(cclk);
> - priv->mram_base = mram_addr;
> + class_dev->net = net_dev;
> + class_dev->dev = dev;
> + SET_NETDEV_DEV(net_dev, dev);
>
> - platform_set_drvdata(pdev, dev);
> - SET_NETDEV_DEV(dev, &pdev->dev);
> + m_can_of_parse_mram(class_dev, mram_config_vals);
> +out:
> + return class_dev;
> +}
> +EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);
>
> - /* Enable clocks. Necessary to read Core Release in order to determine
> - * M_CAN version
> - */
> - pm_runtime_enable(&pdev->dev);
> - ret = m_can_clk_start(priv);
> - if (ret)
> - goto pm_runtime_fail;
> +int m_can_class_register(struct m_can_priv *m_can_dev)
> +{
> + int ret;
> +
> + if (m_can_dev->pm_clock_support) {
> + pm_runtime_enable(m_can_dev->dev);
> + ret = m_can_clk_start(m_can_dev);
> + if (ret)
> + goto pm_runtime_fail;
> + }
>
> - ret = m_can_dev_setup(pdev, dev, addr);
> + ret = m_can_dev_setup(m_can_dev);
> if (ret)
> goto clk_disable;
>
> - ret = register_m_can_dev(dev);
> + ret = register_m_can_dev(m_can_dev->net);
> if (ret) {
> - dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
> - KBUILD_MODNAME, ret);
> + dev_err(m_can_dev->dev, "registering %s failed (err=%d)\n",
> + m_can_dev->net->name, ret);
> goto clk_disable;
> }
>
> - m_can_of_parse_mram(priv, mram_config_vals);
> + devm_can_led_init(m_can_dev->net);
>
> - devm_can_led_init(dev);
> + of_can_transceiver(m_can_dev->net);
>
> - of_can_transceiver(dev);
> -
> - dev_info(&pdev->dev, "%s device registered (irq=%d, version=%d)\n",
> - KBUILD_MODNAME, dev->irq, priv->version);
> + dev_info(m_can_dev->dev, "%s device registered (irq=%d, version=%d)\n",
> + KBUILD_MODNAME, m_can_dev->net->irq, m_can_dev->version);
>
> /* Probe finished
> * Stop clocks. They will be reactivated once the M_CAN device is opened
> */
> clk_disable:
> - m_can_clk_stop(priv);
> + m_can_clk_stop(m_can_dev);
> pm_runtime_fail:
> if (ret) {
> - pm_runtime_disable(&pdev->dev);
> - free_candev(dev);
> + if (m_can_dev->pm_clock_support)
> + pm_runtime_disable(m_can_dev->dev);
> + free_candev(m_can_dev->net);
> }
> -failed_ret:
> +
> return ret;
> }
> +EXPORT_SYMBOL_GPL(m_can_class_register);
>
> -static __maybe_unused int m_can_suspend(struct device *dev)
> +int m_can_class_suspend(struct device *dev)
> {
> struct net_device *ndev = dev_get_drvdata(dev);
> struct m_can_priv *priv = netdev_priv(ndev);
> @@ -1708,8 +1800,9 @@ static __maybe_unused int m_can_suspend(struct device *dev)
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(m_can_class_suspend);
>
> -static __maybe_unused int m_can_resume(struct device *dev)
> +int m_can_class_resume(struct device *dev)
> {
> struct net_device *ndev = dev_get_drvdata(dev);
> struct m_can_priv *priv = netdev_priv(ndev);
> @@ -1733,79 +1826,19 @@ static __maybe_unused int m_can_resume(struct device *dev)
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(m_can_class_resume);
>
> -static void unregister_m_can_dev(struct net_device *dev)
> -{
> - unregister_candev(dev);
> -}
> -
> -static int m_can_plat_remove(struct platform_device *pdev)
> -{
> - struct net_device *dev = platform_get_drvdata(pdev);
> -
> - unregister_m_can_dev(dev);
> -
> - pm_runtime_disable(&pdev->dev);
> -
> - platform_set_drvdata(pdev, NULL);
> -
> - free_candev(dev);
> -
> - return 0;
> -}
> -
> -static int __maybe_unused m_can_runtime_suspend(struct device *dev)
> +void m_can_class_unregister(struct m_can_priv *m_can_dev)
> {
> - struct net_device *ndev = dev_get_drvdata(dev);
> - struct m_can_priv *priv = netdev_priv(ndev);
> + unregister_candev(m_can_dev->net);
>
> - clk_disable_unprepare(priv->cclk);
> - clk_disable_unprepare(priv->hclk);
> + m_can_clk_stop(m_can_dev);
>
> - return 0;
> + free_candev(m_can_dev->net);
> }
> -
> -static int __maybe_unused m_can_runtime_resume(struct device *dev)
> -{
> - struct net_device *ndev = dev_get_drvdata(dev);
> - struct m_can_priv *priv = netdev_priv(ndev);
> - int err;
> -
> - err = clk_prepare_enable(priv->hclk);
> - if (err)
> - return err;
> -
> - err = clk_prepare_enable(priv->cclk);
> - if (err)
> - clk_disable_unprepare(priv->hclk);
> -
> - return err;
> -}
> -
> -static const struct dev_pm_ops m_can_pmops = {
> - SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
> - m_can_runtime_resume, NULL)
> - SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
> -};
> -
> -static const struct of_device_id m_can_of_table[] = {
> - { .compatible = "bosch,m_can", .data = NULL },
> - { /* sentinel */ },
> -};
> -MODULE_DEVICE_TABLE(of, m_can_of_table);
> -
> -static struct platform_driver m_can_plat_driver = {
> - .driver = {
> - .name = KBUILD_MODNAME,
> - .of_match_table = m_can_of_table,
> - .pm = &m_can_pmops,
> - },
> - .probe = m_can_plat_probe,
> - .remove = m_can_plat_remove,
> -};
> -
> -module_platform_driver(m_can_plat_driver);
> +EXPORT_SYMBOL_GPL(m_can_class_unregister);
>
> MODULE_AUTHOR("Dong Aisheng <[email protected]>");
> +MODULE_AUTHOR("Dan Murphy <[email protected]>");
> MODULE_LICENSE("GPL v2");
> MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller");
> diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
> new file mode 100644
> index 000000000000..b60f27dd9f33
> --- /dev/null
> +++ b/drivers/net/can/m_can/m_can.h
> @@ -0,0 +1,110 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* CAN bus driver for Bosch M_CAN controller
> + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
> + */
> +
> +#ifndef _CAN_M_CAN_H_
> +#define _CAN_M_CAN_H_
> +
> +#include <linux/can/core.h>
> +#include <linux/can/led.h>
> +#include <linux/completion.h>
> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/freezer.h>
> +#include <linux/slab.h>
> +#include <linux/uaccess.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/netdevice.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/iopoll.h>
> +#include <linux/can/dev.h>
> +#include <linux/pinctrl/consumer.h>
> +
> +/* m_can lec values */
> +enum m_can_lec_type {
> + LEC_NO_ERROR = 0,
> + LEC_STUFF_ERROR,
> + LEC_FORM_ERROR,
> + LEC_ACK_ERROR,
> + LEC_BIT1_ERROR,
> + LEC_BIT0_ERROR,
> + LEC_CRC_ERROR,
> + LEC_UNUSED,
> +};
> +
> +enum m_can_mram_cfg {
> + MRAM_SIDF = 0,
> + MRAM_XIDF,
> + MRAM_RXF0,
> + MRAM_RXF1,
> + MRAM_RXB,
> + MRAM_TXE,
> + MRAM_TXB,
> + MRAM_CFG_NUM,
> +};
> +
> +/* address offset and element number for each FIFO/Buffer in the Message RAM */
> +struct mram_cfg {
> + u16 off;
> + u8 num;
> +};
> +
> +struct m_can_priv;
> +struct m_can_ops {
> + /* Device specific call backs */
> + int (*clear_interrupts)(struct m_can_priv *m_can_class);
> + u32 (*read_reg)(struct m_can_priv *m_can_class, int reg);
> + int (*write_reg)(struct m_can_priv *m_can_class, int reg, int val);
> + u32 (*read_fifo)(struct m_can_priv *m_can_class, int addr_offset);
> + int (*write_fifo)(struct m_can_priv *m_can_class, int addr_offset,
> + int val);
> + int (*init)(struct m_can_priv *m_can_class);
> +};
> +
> +struct m_can_priv {
> + struct can_priv can;
> + struct napi_struct napi;
> + struct net_device *net;
> + struct device *dev;
> + struct clk *hclk;
> + struct clk *cclk;
> +
> + struct workqueue_struct *tx_wq;
> + struct work_struct tx_work;
> + struct sk_buff *tx_skb;
> +
> + struct can_bittiming_const *bit_timing;
> + struct can_bittiming_const *data_timing;
> +
> + struct m_can_ops *ops;
> +
> + void *device_data;
> +
> + int version;
> + int freq;
> + u32 irqstatus;
> +
> + int pm_clock_support;
> + int is_peripherial;
> +
> + struct mram_cfg mcfg[MRAM_CFG_NUM];
> +};
> +
> +struct m_can_priv *m_can_class_allocate_dev(struct device *dev);
> +int m_can_class_register(struct m_can_priv *m_can_dev);
> +void m_can_class_unregister(struct m_can_priv *m_can_dev);
> +int m_can_class_get_clocks(struct m_can_priv *m_can_dev);
> +void m_can_init_ram(struct m_can_priv *priv);
> +void m_can_config_endisable(struct m_can_priv *priv, bool enable);
> +
> +int m_can_class_suspend(struct device *dev);
> +int m_can_class_resume(struct device *dev);
> +#endif /* _CAN_M_H_ */
> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
> new file mode 100644
> index 000000000000..b02d49f9ee4c
> --- /dev/null
> +++ b/drivers/net/can/m_can/m_can_platform.c
> @@ -0,0 +1,202 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// IOMapped CAN bus driver for Bosch M_CAN controller
> +// Copyright (C) 2014 Freescale Semiconductor, Inc.
> +// Dong Aisheng <[email protected]>
> +//
> +// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
> +
> +#include <linux/platform_device.h>
> +
> +#include "m_can.h"
> +
> +struct m_can_plat_priv {
> + void __iomem *base;
> + void __iomem *mram_base;
> +};
> +
> +static u32 iomap_read_reg(struct m_can_priv *cdev, int reg)
> +{
> + struct m_can_plat_priv *priv =
> + (struct m_can_plat_priv *)cdev->device_data;
> +
> + return readl(priv->base + reg);
> +}
> +
> +static u32 iomap_read_fifo(struct m_can_priv *cdev, int offset)
> +{
> + struct m_can_plat_priv *priv =
> + (struct m_can_plat_priv *)cdev->device_data;
> +
> + return readl(priv->mram_base + offset);
> +}
> +
> +static int iomap_write_reg(struct m_can_priv *cdev, int reg, int val)
> +{
> + struct m_can_plat_priv *priv =
> + (struct m_can_plat_priv *)cdev->device_data;
> +
> + writel(val, priv->base + reg);
> +
> + return 0;
> +}
> +
> +static int iomap_write_fifo(struct m_can_priv *cdev, int offset, int val)
> +{
> + struct m_can_plat_priv *priv =
> + (struct m_can_plat_priv *)cdev->device_data;
> +
> + writel(val, priv->mram_base + offset);
> +
> + return 0;
> +}
> +
> +static struct m_can_ops m_can_plat_ops = {
> + .read_reg = iomap_read_reg,
> + .write_reg = iomap_write_reg,
> + .write_fifo = iomap_write_fifo,
> + .read_fifo = iomap_read_fifo,
> +};
> +
> +static int m_can_plat_probe(struct platform_device *pdev)
> +{
> + struct m_can_priv *mcan_class;
> + struct m_can_plat_priv *priv;
> + struct resource *res;
> + void __iomem *addr;
> + void __iomem *mram_addr;
> + int irq, ret = 0;
> +
> + mcan_class = m_can_class_allocate_dev(&pdev->dev);
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + mcan_class->device_data = priv;
> +
> + m_can_class_get_clocks(mcan_class);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
> + addr = devm_ioremap_resource(&pdev->dev, res);
> + irq = platform_get_irq_byname(pdev, "int0");
> + if (IS_ERR(addr) || irq < 0) {
> + ret = -EINVAL;
> + goto failed_ret;
> + }
> +
> + /* message ram could be shared */
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
> + if (!res) {
> + ret = -ENODEV;
> + goto failed_ret;
> + }
> +
> + mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> + if (!mram_addr) {
> + ret = -ENOMEM;
> + goto failed_ret;
> + }
> +
> + priv->base = addr;
> + priv->mram_base = mram_addr;
> +
> + mcan_class->net->irq = irq;
> + mcan_class->pm_clock_support = 1;
> + mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk);
> + mcan_class->dev = &pdev->dev;
> +
> + mcan_class->ops = &m_can_plat_ops;
> +
> + mcan_class->is_peripherial = false;
> +
> + platform_set_drvdata(pdev, mcan_class->dev);
> +
> + m_can_init_ram(mcan_class);
> +
> + ret = m_can_class_register(mcan_class);
> +
> +failed_ret:
> + return ret;
> +}
> +
> +static __maybe_unused int m_can_suspend(struct device *dev)
> +{
> + return m_can_class_suspend(dev);
> +}
> +
> +static __maybe_unused int m_can_resume(struct device *dev)
> +{
> + return m_can_class_resume(dev);
> +}
> +
> +static int m_can_plat_remove(struct platform_device *pdev)
> +{
> + struct net_device *dev = platform_get_drvdata(pdev);
> + struct m_can_priv *mcan_class = netdev_priv(dev);
> +
> + m_can_class_unregister(mcan_class);
> +
> + platform_set_drvdata(pdev, NULL);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused m_can_runtime_suspend(struct device *dev)
> +{
> + struct net_device *ndev = dev_get_drvdata(dev);
> + struct m_can_priv *mcan_class = netdev_priv(ndev);
> +
> + m_can_class_suspend(dev);
> +
> + clk_disable_unprepare(mcan_class->cclk);
> + clk_disable_unprepare(mcan_class->hclk);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused m_can_runtime_resume(struct device *dev)
> +{
> + struct net_device *ndev = dev_get_drvdata(dev);
> + struct m_can_priv *mcan_class = netdev_priv(ndev);
> + int err;
> +
> + err = clk_prepare_enable(mcan_class->hclk);
> + if (err)
> + return err;
> +
> + err = clk_prepare_enable(mcan_class->cclk);
> + if (err)
> + clk_disable_unprepare(mcan_class->hclk);
> +
> + m_can_class_resume(dev);
> +
> + return err;
> +}
> +
> +static const struct dev_pm_ops m_can_pmops = {
> + SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
> + m_can_runtime_resume, NULL)
> + SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
> +};
> +
> +static const struct of_device_id m_can_of_table[] = {
> + { .compatible = "bosch,m_can", .data = NULL },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, m_can_of_table);
> +
> +static struct platform_driver m_can_plat_driver = {
> + .driver = {
> + .name = KBUILD_MODNAME,
> + .of_match_table = m_can_of_table,
> + .pm = &m_can_pmops,
> + },
> + .probe = m_can_plat_probe,
> + .remove = m_can_plat_remove,
> +};
> +
> +module_platform_driver(m_can_plat_driver);
> +
> +MODULE_AUTHOR("Dong Aisheng <[email protected]>");
> +MODULE_AUTHOR("Dan Murphy <[email protected]>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("M_CAN driver for IO Mapped Bosch controllers");
Wolfgang.
Wolfgang
On 3/12/19 9:42 AM, Wolfgang Grandegger wrote:
> Hello Dan,
>
> in the previous email you said that the tcan4x5x uses:
>
> Bosch M-CAN Revision 3.2.1.1
>
> This means "cdev->version == 32", hence it's using FIFOs...
>
> Am 12.03.19 um 13:12 schrieb Dan Murphy:
>> Create a m_can platform framework that peripherial
>> devices can register to and use common code and register sets.
>> The peripherial devices may provide read/write and configuration
>> support of the IP.
>>
>> Signed-off-by: Dan Murphy <[email protected]>
>> ---
>>
>> v8 - Added a clean function for the tx_skb, cleaned up skb on BUS_OFF and on xmit
>> BUSY - https://lore.kernel.org/patchwork/patch/1047980/
>>
>> v7 - Fixed remaining new checkpatch issues, removed CSR setting, fixed tx hard
>> start function to return tx_busy, and renamed device callbacks - https://lore.kernel.org/patchwork/patch/1047220/
>> v6 - Squashed platform patch to this patch for bissectablity, fixed coding style
>> issues, updated Kconfig help, placed mcan reg offsets back into c file, renamed
>> priv->skb to priv->tx_skb and cleared perp interrupts at ISR start -
>> Patch 1 comments - https://lore.kernel.org/patchwork/patch/1042446/
>> Patch 2 comments - https://lore.kernel.org/patchwork/patch/1042442/
>>
>> drivers/net/can/m_can/Kconfig | 13 +-
>> drivers/net/can/m_can/Makefile | 1 +
>> drivers/net/can/m_can/m_can.c | 717 +++++++++++++------------
>> drivers/net/can/m_can/m_can.h | 110 ++++
>> drivers/net/can/m_can/m_can_platform.c | 202 +++++++
>> 5 files changed, 699 insertions(+), 344 deletions(-)
>> create mode 100644 drivers/net/can/m_can/m_can.h
>> create mode 100644 drivers/net/can/m_can/m_can_platform.c
>>
>> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
>> index 04f20dd39007..f7119fd72df4 100644
>> --- a/drivers/net/can/m_can/Kconfig
>> +++ b/drivers/net/can/m_can/Kconfig
>> @@ -1,5 +1,14 @@
>> config CAN_M_CAN
>> + tristate "Bosch M_CAN support"
>> + ---help---
>> + Say Y here if you want support for Bosch M_CAN controller framework.
>> + This is common support for devices that embed the Bosch M_CAN IP.
>> +
>> +config CAN_M_CAN_PLATFORM
>> + tristate "Bosch M_CAN support for io-mapped devices"
>> depends on HAS_IOMEM
>> - tristate "Bosch M_CAN devices"
>> + depends on CAN_M_CAN
>> ---help---
>> - Say Y here if you want to support for Bosch M_CAN controller.
>> + Say Y here if you want support for IO Mapped Bosch M_CAN controller.
>> + This support is for devices that have the Bosch M_CAN controller
>> + IP embedded into the device and the IP is IO Mapped to the processor.
>> diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
>> index 8bbd7f24f5be..057bbcdb3c74 100644
>> --- a/drivers/net/can/m_can/Makefile
>> +++ b/drivers/net/can/m_can/Makefile
>> @@ -3,3 +3,4 @@
>> #
>>
>> obj-$(CONFIG_CAN_M_CAN) += m_can.o
>> +obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
>> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
>> index 9b449400376b..f2231fb02525 100644
>> --- a/drivers/net/can/m_can/m_can.c
>> +++ b/drivers/net/can/m_can/m_can.c
>> @@ -1,20 +1,14 @@
>> -/*
>> - * CAN bus driver for Bosch M_CAN controller
>> - *
>> - * Copyright (C) 2014 Freescale Semiconductor, Inc.
>> - * Dong Aisheng <[email protected]>
>> - *
>> - * Bosch M_CAN user manual can be obtained from:
>> +// SPDX-License-Identifier: GPL-2.0
>> +// CAN bus driver for Bosch M_CAN controller
>> +// Copyright (C) 2014 Freescale Semiconductor, Inc.
>> +// Dong Aisheng <[email protected]>
>> +// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
>> +
>> +/* Bosch M_CAN user manual can be obtained from:
>> * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/
>> * mcan_users_manual_v302.pdf
>> - *
>> - * This file is licensed under the terms of the GNU General Public
>> - * License version 2. This program is licensed "as is" without any
>> - * warranty of any kind, whether express or implied.
>> */
>>
>> -#include <linux/clk.h>
>> -#include <linux/delay.h>
>> #include <linux/interrupt.h>
>> #include <linux/io.h>
>> #include <linux/kernel.h>
>> @@ -28,11 +22,7 @@
>> #include <linux/can/dev.h>
>> #include <linux/pinctrl/consumer.h>
>>
>> -/* napi related */
>> -#define M_CAN_NAPI_WEIGHT 64
>> -
>> -/* message ram configuration data length */
>> -#define MRAM_CFG_LEN 8
>> +#include "m_can.h"
>>
>> /* registers definition */
>> enum m_can_reg {
>> @@ -86,28 +76,11 @@ enum m_can_reg {
>> M_CAN_TXEFA = 0xf8,
>> };
>>
>> -/* m_can lec values */
>> -enum m_can_lec_type {
>> - LEC_NO_ERROR = 0,
>> - LEC_STUFF_ERROR,
>> - LEC_FORM_ERROR,
>> - LEC_ACK_ERROR,
>> - LEC_BIT1_ERROR,
>> - LEC_BIT0_ERROR,
>> - LEC_CRC_ERROR,
>> - LEC_UNUSED,
>> -};
>> +/* napi related */
>> +#define M_CAN_NAPI_WEIGHT 64
>>
>> -enum m_can_mram_cfg {
>> - MRAM_SIDF = 0,
>> - MRAM_XIDF,
>> - MRAM_RXF0,
>> - MRAM_RXF1,
>> - MRAM_RXB,
>> - MRAM_TXE,
>> - MRAM_TXB,
>> - MRAM_CFG_NUM,
>> -};
>> +/* message ram configuration data length */
>> +#define MRAM_CFG_LEN 8
>>
>> /* Core Release Register (CREL) */
>> #define CREL_REL_SHIFT 28
>> @@ -347,68 +320,72 @@ enum m_can_mram_cfg {
>> #define TX_EVENT_MM_SHIFT TX_BUF_MM_SHIFT
>> #define TX_EVENT_MM_MASK (0xff << TX_EVENT_MM_SHIFT)
>>
>> -/* address offset and element number for each FIFO/Buffer in the Message RAM */
>> -struct mram_cfg {
>> - u16 off;
>> - u8 num;
>> -};
>> -
>> -/* m_can private data structure */
>> -struct m_can_priv {
>> - struct can_priv can; /* must be the first member */
>> - struct napi_struct napi;
>> - struct net_device *dev;
>> - struct device *device;
>> - struct clk *hclk;
>> - struct clk *cclk;
>> - void __iomem *base;
>> - u32 irqstatus;
>> - int version;
>> -
>> - /* message ram configuration */
>> - void __iomem *mram_base;
>> - struct mram_cfg mcfg[MRAM_CFG_NUM];
>> -};
>> +static u32 m_can_read(struct m_can_priv *priv, enum m_can_reg reg)
>> +{
>> + if (priv->ops->read_reg)
>> + return priv->ops->read_reg(priv, reg);
>> + else
>> + return -EINVAL;
>> +}
>>
>> -static inline u32 m_can_read(const struct m_can_priv *priv, enum m_can_reg reg)
>> +static int m_can_write(struct m_can_priv *priv, enum m_can_reg reg, u32 val)
>> {
>> - return readl(priv->base + reg);
>> + if (priv->ops->write_reg)
>> + return priv->ops->write_reg(priv, reg, val);
>> + else
>> + return -EINVAL;
>> }
>>
>> -static inline void m_can_write(const struct m_can_priv *priv,
>> - enum m_can_reg reg, u32 val)
>> +static u32 m_can_fifo_read(struct m_can_priv *priv,
>> + u32 fgi, unsigned int offset)
>> {
>> - writel(val, priv->base + reg);
>> + u32 addr_offset = priv->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE +
>> + offset;
>> +
>> + if (priv->ops->read_fifo)
>> + return priv->ops->read_fifo(priv, addr_offset);
>> + else
>> + return -EINVAL;
>> }
>>
>> -static inline u32 m_can_fifo_read(const struct m_can_priv *priv,
>> - u32 fgi, unsigned int offset)
>> +static u32 m_can_fifo_write(struct m_can_priv *priv,
>> + u32 fpi, unsigned int offset, u32 val)
>> {
>> - return readl(priv->mram_base + priv->mcfg[MRAM_RXF0].off +
>> - fgi * RXF0_ELEMENT_SIZE + offset);
>> + u32 addr_offset = priv->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE +
>> + offset;
>> +
>> + if (priv->ops->write_fifo)
>> + return priv->ops->write_fifo(priv, addr_offset, val);
>> + else
>> + return -EINVAL;
>> }
>>
>> -static inline void m_can_fifo_write(const struct m_can_priv *priv,
>> - u32 fpi, unsigned int offset, u32 val)
>> +static u32 m_can_fifo_write_no_off(struct m_can_priv *priv,
>> + u32 fpi, u32 val)
>> {
>> - writel(val, priv->mram_base + priv->mcfg[MRAM_TXB].off +
>> - fpi * TXB_ELEMENT_SIZE + offset);
>> + if (priv->ops->write_fifo)
>> + return priv->ops->write_fifo(priv, fpi, val);
>> + else
>> + return 0;
>> }
>>
>> -static inline u32 m_can_txe_fifo_read(const struct m_can_priv *priv,
>> - u32 fgi,
>> - u32 offset) {
>> - return readl(priv->mram_base + priv->mcfg[MRAM_TXE].off +
>> - fgi * TXE_ELEMENT_SIZE + offset);
>> +static u32 m_can_txe_fifo_read(struct m_can_priv *priv, u32 fgi, u32 offset)
>> +{
>> + u32 addr_offset = priv->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE +
>> + offset;
>> +
>> + if (priv->ops->read_fifo)
>> + return priv->ops->read_fifo(priv, addr_offset);
>> + else
>> + return -EINVAL;
>> }
>>
>> -static inline bool m_can_tx_fifo_full(const struct m_can_priv *priv)
>> +static inline bool m_can_tx_fifo_full(struct m_can_priv *priv)
>> {
>> return !!(m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQF);
>> }
>>
>> -static inline void m_can_config_endisable(const struct m_can_priv *priv,
>> - bool enable)
>> +void m_can_config_endisable(struct m_can_priv *priv, bool enable)
>> {
>> u32 cccr = m_can_read(priv, M_CAN_CCCR);
>> u32 timeout = 10;
>> @@ -430,7 +407,7 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
>>
>> while ((m_can_read(priv, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) {
>> if (timeout == 0) {
>> - netdev_warn(priv->dev, "Failed to init module\n");
>> + netdev_warn(priv->net, "Failed to init module\n");
>> return;
>> }
>> timeout--;
>> @@ -438,17 +415,29 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
>> }
>> }
>>
>> -static inline void m_can_enable_all_interrupts(const struct m_can_priv *priv)
>> +static inline void m_can_enable_all_interrupts(struct m_can_priv *priv)
>> {
>> /* Only interrupt line 0 is used in this driver */
>> m_can_write(priv, M_CAN_ILE, ILE_EINT0);
>> }
>>
>> -static inline void m_can_disable_all_interrupts(const struct m_can_priv *priv)
>> +static inline void m_can_disable_all_interrupts(struct m_can_priv *priv)
>> {
>> m_can_write(priv, M_CAN_ILE, 0x0);
>> }
>>
>> +static void m_can_clean(struct net_device *net)
>> +{
>> + struct m_can_priv *priv = netdev_priv(net);
>> +
>> + if (priv->tx_skb) {
>> + net->stats.tx_errors++;
>> + dev_kfree_skb(priv->tx_skb);
>> + can_free_echo_skb(priv->net, 0);
>
> I think this frees the skb twice!
>
It appears so. I will fix it up.
> Also, the index depends on "cdev->version"! If > 30, the last used index
> should be selected.
>
OK I will need to look into that.
>> + priv->tx_skb = NULL;
>> + }
>> +}
>> +
>> static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
>> {
>> struct net_device_stats *stats = &dev->stats;
>> @@ -633,9 +622,12 @@ static int m_can_clk_start(struct m_can_priv *priv)
>> {
>> int err;
>>
>> - err = pm_runtime_get_sync(priv->device);
>> + if (priv->pm_clock_support == 0)
>> + return 0;
>> +
>> + err = pm_runtime_get_sync(priv->dev);
>> if (err < 0) {
>> - pm_runtime_put_noidle(priv->device);
>> + pm_runtime_put_noidle(priv->dev);
>> return err;
>> }
>>
>> @@ -644,7 +636,8 @@ static int m_can_clk_start(struct m_can_priv *priv)
>>
>> static void m_can_clk_stop(struct m_can_priv *priv)
>> {
>> - pm_runtime_put_sync(priv->device);
>> + if (priv->pm_clock_support)
>> + pm_runtime_put_sync(priv->dev);
>> }
>>
>> static int m_can_get_berr_counter(const struct net_device *dev,
>> @@ -811,9 +804,8 @@ static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
>> return work_done;
>> }
>>
>> -static int m_can_poll(struct napi_struct *napi, int quota)
>> +static int m_can_rx_handler(struct net_device *dev, int quota)
>> {
>> - struct net_device *dev = napi->dev;
>> struct m_can_priv *priv = netdev_priv(dev);
>> int work_done = 0;
>> u32 irqstatus, psr;
>> @@ -831,13 +823,33 @@ static int m_can_poll(struct napi_struct *napi, int quota)
>>
>> if (irqstatus & IR_RF0N)
>> work_done += m_can_do_rx_poll(dev, (quota - work_done));
>> +end:
>> + return work_done;
>> +}
>> +
>> +static int m_can_rx_peripherial(struct net_device *dev)
>> +{
>> + struct m_can_priv *priv = netdev_priv(dev);
>> +
>> + m_can_rx_handler(dev, 1);
>> +
>> + m_can_enable_all_interrupts(priv);
>>
>> + return 0;
>> +}
>> +
>> +static int m_can_poll(struct napi_struct *napi, int quota)
>> +{
>> + struct net_device *dev = napi->dev;
>> + struct m_can_priv *priv = netdev_priv(dev);
>> + int work_done;
>> +
>> + work_done = m_can_rx_handler(dev, quota);
>> if (work_done < quota) {
>> napi_complete_done(napi, work_done);
>> m_can_enable_all_interrupts(priv);
>> }
>>
>> -end:
>> return work_done;
>> }
>>
>> @@ -894,6 +906,9 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
>> if (ir & IR_ALL_INT)
>> m_can_write(priv, M_CAN_IR, ir);
>>
>> + if (priv->ops->clear_interrupts)
>> + priv->ops->clear_interrupts(priv);
>> +
>> /* schedule NAPI in case of
>> * - rx IRQ
>> * - state change IRQ
>> @@ -902,7 +917,10 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
>> if ((ir & IR_RF0N) || (ir & IR_ERR_ALL_30X)) {
>> priv->irqstatus = ir;
>> m_can_disable_all_interrupts(priv);
>> - napi_schedule(&priv->napi);
>> + if (!priv->is_peripherial)
>> + napi_schedule(&priv->napi);
>> + else
>> + m_can_rx_peripherial(dev);
>> }
>>
>> if (priv->version == 30) {
>> @@ -1155,6 +1173,9 @@ static void m_can_chip_config(struct net_device *dev)
>> m_can_set_bittiming(dev);
>>
>> m_can_config_endisable(priv, false);
>> +
>> + if (priv->ops->init)
>> + priv->ops->init(priv);
>> }
>>
>> static void m_can_start(struct net_device *dev)
>> @@ -1173,6 +1194,7 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
>> {
>> switch (mode) {
>> case CAN_MODE_START:
>> + m_can_clean(dev);
>> m_can_start(dev);
>> netif_wake_queue(dev);
>> break;
>> @@ -1188,20 +1210,17 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
>> * else it returns the release and step coded as:
>> * return value = 10 * <release> + 1 * <step>
>> */
>> -static int m_can_check_core_release(void __iomem *m_can_base)
>> +static int m_can_check_core_release(struct m_can_priv *priv)
>> {
>> u32 crel_reg;
>> u8 rel;
>> u8 step;
>> int res;
>> - struct m_can_priv temp_priv = {
>> - .base = m_can_base
>> - };
>>
>> /* Read Core Release Version and split into version number
>> * Example: Version 3.2.1 => rel = 3; step = 2; substep = 1;
>> */
>> - crel_reg = m_can_read(&temp_priv, M_CAN_CREL);
>> + crel_reg = m_can_read(priv, M_CAN_CREL);
>> rel = (u8)((crel_reg & CREL_REL_MASK) >> CREL_REL_SHIFT);
>> step = (u8)((crel_reg & CREL_STEP_MASK) >> CREL_STEP_SHIFT);
>>
>> @@ -1219,18 +1238,26 @@ static int m_can_check_core_release(void __iomem *m_can_base)
>> /* Selectable Non ISO support only in version 3.2.x
>> * This function checks if the bit is writable.
>> */
>> -static bool m_can_niso_supported(const struct m_can_priv *priv)
>> +static bool m_can_niso_supported(struct m_can_priv *priv)
>> {
>> - u32 cccr_reg, cccr_poll;
>> - int niso_timeout;
>> + u32 cccr_reg, cccr_poll = 0;
>> + int niso_timeout = -ETIMEDOUT;
>> + int i;
>>
>> m_can_config_endisable(priv, true);
>> cccr_reg = m_can_read(priv, M_CAN_CCCR);
>> cccr_reg |= CCCR_NISO;
>> m_can_write(priv, M_CAN_CCCR, cccr_reg);
>>
>> - niso_timeout = readl_poll_timeout((priv->base + M_CAN_CCCR), cccr_poll,
>> - (cccr_poll == cccr_reg), 0, 10);
>> + for (i = 0; i <= 10; i++) {
>> + cccr_poll = m_can_read(priv, M_CAN_CCCR);
>> + if (cccr_poll == cccr_reg) {
>> + niso_timeout = 0;
>> + break;
>> + }
>> +
>> + usleep_range(1, 5);
>> + }
>>
>> /* Clear NISO */
>> cccr_reg &= ~(CCCR_NISO);
>> @@ -1242,107 +1269,79 @@ static bool m_can_niso_supported(const struct m_can_priv *priv)
>> return !niso_timeout;
>> }
>>
>> -static int m_can_dev_setup(struct platform_device *pdev, struct net_device *dev,
>> - void __iomem *addr)
>> +static int m_can_dev_setup(struct m_can_priv *m_can_dev)
>> {
>> - struct m_can_priv *priv;
>> + struct net_device *dev = m_can_dev->net;
>> int m_can_version;
>>
>> - m_can_version = m_can_check_core_release(addr);
>> + m_can_version = m_can_check_core_release(m_can_dev);
>> /* return if unsupported version */
>> if (!m_can_version) {
>> - dev_err(&pdev->dev, "Unsupported version number: %2d",
>> + dev_err(m_can_dev->dev, "Unsupported version number: %2d",
>> m_can_version);
>> return -EINVAL;
>> }
>>
>> - priv = netdev_priv(dev);
>> - netif_napi_add(dev, &priv->napi, m_can_poll, M_CAN_NAPI_WEIGHT);
>> + if (!m_can_dev->is_peripherial)
>> + netif_napi_add(dev, &m_can_dev->napi,
>> + m_can_poll, M_CAN_NAPI_WEIGHT);
>>
>> /* Shared properties of all M_CAN versions */
>> - priv->version = m_can_version;
>> - priv->dev = dev;
>> - priv->base = addr;
>> - priv->can.do_set_mode = m_can_set_mode;
>> - priv->can.do_get_berr_counter = m_can_get_berr_counter;
>> + m_can_dev->version = m_can_version;
>> + m_can_dev->can.do_set_mode = m_can_set_mode;
>> + m_can_dev->can.do_get_berr_counter = m_can_get_berr_counter;
>>
>> /* Set M_CAN supported operations */
>> - priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
>> + m_can_dev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
>> CAN_CTRLMODE_LISTENONLY |
>> CAN_CTRLMODE_BERR_REPORTING |
>> CAN_CTRLMODE_FD;
>>
>> /* Set properties depending on M_CAN version */
>> - switch (priv->version) {
>> + switch (m_can_dev->version) {
>> case 30:
>> /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.x */
>> can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
>> - priv->can.bittiming_const = &m_can_bittiming_const_30X;
>> - priv->can.data_bittiming_const =
>> - &m_can_data_bittiming_const_30X;
>> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
>> + m_can_dev->bit_timing : &m_can_bittiming_const_30X;
>> +
>> + m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
>> + m_can_dev->data_timing :
>> + &m_can_data_bittiming_const_30X;
>> break;
>> case 31:
>> /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.1.x */
>> can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
>> - priv->can.bittiming_const = &m_can_bittiming_const_31X;
>> - priv->can.data_bittiming_const =
>> - &m_can_data_bittiming_const_31X;
>> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
>> + m_can_dev->bit_timing : &m_can_bittiming_const_31X;
>> +
>> + m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
>> + m_can_dev->data_timing :
>> + &m_can_data_bittiming_const_31X;
>> break;
>> case 32:
>> - priv->can.bittiming_const = &m_can_bittiming_const_31X;
>> - priv->can.data_bittiming_const =
>> - &m_can_data_bittiming_const_31X;
>> - priv->can.ctrlmode_supported |= (m_can_niso_supported(priv)
>> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing ?
>> + m_can_dev->bit_timing : &m_can_bittiming_const_31X;
>> +
>> + m_can_dev->can.data_bittiming_const = m_can_dev->data_timing ?
>> + m_can_dev->data_timing :
>> + &m_can_data_bittiming_const_31X;
>> +
>> + m_can_dev->can.ctrlmode_supported |=
>> + (m_can_niso_supported(m_can_dev)
>> ? CAN_CTRLMODE_FD_NON_ISO
>> : 0);
>> break;
>> default:
>> - dev_err(&pdev->dev, "Unsupported version number: %2d",
>> - priv->version);
>> + dev_err(m_can_dev->dev, "Unsupported version number: %2d",
>> + m_can_dev->version);
>> return -EINVAL;
>> }
>>
>> - return 0;
>> -}
>> -
>> -static int m_can_open(struct net_device *dev)
>> -{
>> - struct m_can_priv *priv = netdev_priv(dev);
>> - int err;
>> -
>> - err = m_can_clk_start(priv);
>> - if (err)
>> - return err;
>> -
>> - /* open the can device */
>> - err = open_candev(dev);
>> - if (err) {
>> - netdev_err(dev, "failed to open can device\n");
>> - goto exit_disable_clks;
>> - }
>> -
>> - /* register interrupt handler */
>> - err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
>> - dev);
>> - if (err < 0) {
>> - netdev_err(dev, "failed to request interrupt\n");
>> - goto exit_irq_fail;
>> - }
>> -
>> - /* start the m_can controller */
>> - m_can_start(dev);
>> -
>> - can_led_event(dev, CAN_LED_EVENT_OPEN);
>> - napi_enable(&priv->napi);
>> - netif_start_queue(dev);
>> + if (m_can_dev->ops->init)
>> + m_can_dev->ops->init(m_can_dev);
>>
>> return 0;
>> -
>> -exit_irq_fail:
>> - close_candev(dev);
>> -exit_disable_clks:
>> - m_can_clk_stop(priv);
>> - return err;
>> }
>>
>> static void m_can_stop(struct net_device *dev)
>> @@ -1361,10 +1360,18 @@ static int m_can_close(struct net_device *dev)
>> struct m_can_priv *priv = netdev_priv(dev);
>>
>> netif_stop_queue(dev);
>> - napi_disable(&priv->napi);
>> + if (!priv->is_peripherial)
>> + napi_disable(&priv->napi);
>> m_can_stop(dev);
>> m_can_clk_stop(priv);
>> free_irq(dev->irq, dev);
>> +
>> + if (priv->is_peripherial) {
>> + priv->tx_skb = NULL;
>> + destroy_workqueue(priv->tx_wq);
>> + priv->tx_wq = NULL;
>> + }
>> +
>> close_candev(dev);
>> can_led_event(dev, CAN_LED_EVENT_STOP);
>>
>> @@ -1385,18 +1392,15 @@ static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx)
>> return !!priv->can.echo_skb[next_idx];
>> }
>>
>> -static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
>> - struct net_device *dev)
>> +static netdev_tx_t m_can_tx_handler(struct m_can_priv *priv)
>> {
>> - struct m_can_priv *priv = netdev_priv(dev);
>> - struct canfd_frame *cf = (struct canfd_frame *)skb->data;
>> + struct canfd_frame *cf = (struct canfd_frame *)priv->tx_skb->data;
>> + struct net_device *dev = priv->net;
>> + struct sk_buff *skb = priv->tx_skb;
>> u32 id, cccr, fdflags;
>> int i;
>> int putidx;
>>
>> - if (can_dropped_invalid_skb(dev, skb))
>> - return NETDEV_TX_OK;
>> -
>> /* Generate ID field for TX buffer Element */
>> /* Common to all supported M_CAN versions */
>> if (cf->can_id & CAN_EFF_FLAG) {
>> @@ -1492,14 +1496,117 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
>> m_can_write(priv, M_CAN_TXBAR, (1 << putidx));
>>
>> /* stop network queue if fifo full */
>> - if (m_can_tx_fifo_full(priv) ||
>> - m_can_next_echo_skb_occupied(dev, putidx))
>> - netif_stop_queue(dev);
>> + if (m_can_tx_fifo_full(priv) ||
>> + m_can_next_echo_skb_occupied(dev, putidx))
>> + netif_stop_queue(dev);
>> + }
>> +
>> + return NETDEV_TX_OK;
>> +}
>> +
>> +static void m_can_tx_work_queue(struct work_struct *ws)
>> +{
>> + struct m_can_priv *priv = container_of(ws, struct m_can_priv,
>> + tx_work);
>> + netdev_tx_t ret;
>> +
>> + ret = m_can_tx_handler(priv);
>> + if (ret == NETDEV_TX_OK)
>> + priv->tx_skb = NULL;
>
> What happens to the "tx_skb" if this funtions returns with
> NETDEV_TX_BUSY? Will it be freed?
I am missing the change I put in to free this.
It must have been lost when rebasing the patch set
I will add it back and fix this up
>
>> +}
>> +
>> +static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
>> + struct net_device *dev)
>> +{
>> + struct m_can_priv *priv = netdev_priv(dev);
>> +
>> + if (can_dropped_invalid_skb(dev, skb))
>> + return NETDEV_TX_OK;
>> +
>> + if (priv->is_peripherial) {
>> + if (priv->tx_skb) {
>> + netdev_err(dev, "hard_xmit called while tx busy\n");
>> + return NETDEV_TX_BUSY;
>> + }
>> +
>> + if (priv->can.state == CAN_STATE_BUS_OFF) {
>> + m_can_clean(dev);
>> + } else {
>> + priv->tx_skb = skb;
>> + netif_stop_queue(priv->net);
>
> You stop the queue immediately, even if fifos are used. Is this by purpose?
>
Good catch. I should let the work queue handle this. I see that < 3.0 stops the queue immedidately
but > 3.0 does not.
I don't know what version of core the hi or mcp parts are using it looks to be 3.0.
I believe thats where I pulled the stop from.
I will remove it.
>> + queue_work(priv->tx_wq, &priv->tx_work);
>> + }
>> + } else {
>> + priv->tx_skb = skb;
>> + return m_can_tx_handler(priv);
>> }
>>
>> return NETDEV_TX_OK;
>> }
>>
>> +static int m_can_open(struct net_device *dev)
>> +{
>> + struct m_can_priv *priv = netdev_priv(dev);
>> + int err;
>> +
>> + err = m_can_clk_start(priv);
>> + if (err)
>> + return err;
>> +
>> + /* open the can device */
>> + err = open_candev(dev);
>> + if (err) {
>> + netdev_err(dev, "failed to open can device\n");
>> + goto exit_disable_clks;
>> + }
>> +
>> + /* register interrupt handler */
>> + if (priv->is_peripherial) {
>> + priv->tx_skb = NULL;
>> + priv->tx_wq = alloc_workqueue("mcan_wq",
>> + WQ_FREEZABLE | WQ_MEM_RECLAIM, 0);
>> + if (!priv->tx_wq) {
>> + err = -ENOMEM;
>> + goto out_wq_fail;
>> + }
>> +
>> + INIT_WORK(&priv->tx_work, m_can_tx_work_queue);
>> +
>> + err = request_threaded_irq(dev->irq, NULL, m_can_isr,
>> + IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
>> + dev->name, dev);
>> + } else {
>> + err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
>> + dev);
>> + }
>> +
>> + if (err < 0) {
>> + netdev_err(dev, "failed to request interrupt\n");
>> + goto exit_irq_fail;
>> + }
>> +
>> + /* start the m_can controller */
>> + m_can_start(dev);
>> +
>> + can_led_event(dev, CAN_LED_EVENT_OPEN);
>> +
>> + if (!priv->is_peripherial)
>> + napi_enable(&priv->napi);
>> +
>> + netif_start_queue(dev);
>> +
>> + return 0;
>> +
>> +exit_irq_fail:
>> + if (priv->is_peripherial)
>> + destroy_workqueue(priv->tx_wq);
>> +out_wq_fail:
>> + close_candev(dev);
>> +exit_disable_clks:
>> + m_can_clk_stop(priv);
>> + return err;
>> +}
>> +
>> static const struct net_device_ops m_can_netdev_ops = {
>> .ndo_open = m_can_open,
>> .ndo_stop = m_can_close,
>> @@ -1515,20 +1622,6 @@ static int register_m_can_dev(struct net_device *dev)
>> return register_candev(dev);
>> }
>>
>> -static void m_can_init_ram(struct m_can_priv *priv)
>> -{
>> - int end, i, start;
>> -
>> - /* initialize the entire Message RAM in use to avoid possible
>> - * ECC/parity checksum errors when reading an uninitialized buffer
>> - */
>> - start = priv->mcfg[MRAM_SIDF].off;
>> - end = priv->mcfg[MRAM_TXB].off +
>> - priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
>> - for (i = start; i < end; i += 4)
>> - writel(0x0, priv->mram_base + i);
>> -}
>> -
>> static void m_can_of_parse_mram(struct m_can_priv *priv,
>> const u32 *mram_config_vals)
>> {
>> @@ -1556,9 +1649,8 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
>> priv->mcfg[MRAM_TXB].num = mram_config_vals[7] &
>> (TXBC_NDTB_MASK >> TXBC_NDTB_SHIFT);
>>
>> - dev_dbg(priv->device,
>> - "mram_base %p sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
>> - priv->mram_base,
>> + dev_dbg(priv->dev,
>> + "sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
>> priv->mcfg[MRAM_SIDF].off, priv->mcfg[MRAM_SIDF].num,
>> priv->mcfg[MRAM_XIDF].off, priv->mcfg[MRAM_XIDF].num,
>> priv->mcfg[MRAM_RXF0].off, priv->mcfg[MRAM_RXF0].num,
>> @@ -1566,63 +1658,55 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
>> priv->mcfg[MRAM_RXB].off, priv->mcfg[MRAM_RXB].num,
>> priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num,
>> priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num);
>> -
>> - m_can_init_ram(priv);
>> }
>>
>> -static int m_can_plat_probe(struct platform_device *pdev)
>> +void m_can_init_ram(struct m_can_priv *priv)
>> {
>> - struct net_device *dev;
>> - struct m_can_priv *priv;
>> - struct resource *res;
>> - void __iomem *addr;
>> - void __iomem *mram_addr;
>> - struct clk *hclk, *cclk;
>> - int irq, ret;
>> - struct device_node *np;
>> - u32 mram_config_vals[MRAM_CFG_LEN];
>> - u32 tx_fifo_size;
>> -
>> - np = pdev->dev.of_node;
>> + int end, i, start;
>>
>> - hclk = devm_clk_get(&pdev->dev, "hclk");
>> - cclk = devm_clk_get(&pdev->dev, "cclk");
>> + /* initialize the entire Message RAM in use to avoid possible
>> + * ECC/parity checksum errors when reading an uninitialized buffer
>> + */
>> + start = priv->mcfg[MRAM_SIDF].off;
>> + end = priv->mcfg[MRAM_TXB].off +
>> + priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
>>
>> - if (IS_ERR(hclk) || IS_ERR(cclk)) {
>> - dev_err(&pdev->dev, "no clock found\n");
>> - ret = -ENODEV;
>> - goto failed_ret;
>> - }
>> + for (i = start; i < end; i += 4)
>> + m_can_fifo_write_no_off(priv, i, 0x0);
>> +}
>> +EXPORT_SYMBOL_GPL(m_can_init_ram);
>>
>> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
>> - addr = devm_ioremap_resource(&pdev->dev, res);
>> - irq = platform_get_irq_byname(pdev, "int0");
>> +int m_can_class_get_clocks(struct m_can_priv *m_can_dev)
>> +{
>> + int ret = 0;
>>
>> - if (IS_ERR(addr) || irq < 0) {
>> - ret = -EINVAL;
>> - goto failed_ret;
>> - }
>> + m_can_dev->hclk = devm_clk_get(m_can_dev->dev, "hclk");
>> + m_can_dev->cclk = devm_clk_get(m_can_dev->dev, "cclk");
>>
>> - /* message ram could be shared */
>> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
>> - if (!res) {
>> + if (IS_ERR(m_can_dev->cclk)) {
>> + dev_err(m_can_dev->dev, "no clock found\n");
>> ret = -ENODEV;
>> - goto failed_ret;
>> }
>>
>> - mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
>> - if (!mram_addr) {
>> - ret = -ENOMEM;
>> - goto failed_ret;
>> - }
>> + return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(m_can_class_get_clocks);
>>
>> - /* get message ram configuration */
>> - ret = of_property_read_u32_array(np, "bosch,mram-cfg",
>> - mram_config_vals,
>> - sizeof(mram_config_vals) / 4);
>> +struct m_can_priv *m_can_class_allocate_dev(struct device *dev)
>> +{
>> + struct m_can_priv *class_dev = NULL;
>> + u32 mram_config_vals[MRAM_CFG_LEN];
>> + struct net_device *net_dev;
>> + u32 tx_fifo_size;
>> + int ret;
>> +
>> + ret = fwnode_property_read_u32_array(dev_fwnode(dev),
>> + "bosch,mram-cfg",
>> + mram_config_vals,
>> + sizeof(mram_config_vals) / 4);
>> if (ret) {
>> - dev_err(&pdev->dev, "Could not get Message RAM configuration.");
>> - goto failed_ret;
>> + dev_err(dev, "Could not get Message RAM configuration.");
>> + goto out;
>> }
>>
>> /* Get TX FIFO size
>> @@ -1631,66 +1715,74 @@ static int m_can_plat_probe(struct platform_device *pdev)
>> tx_fifo_size = mram_config_vals[7];
>>
>> /* allocate the m_can device */
>> - dev = alloc_candev(sizeof(*priv), tx_fifo_size);
>> - if (!dev) {
>> - ret = -ENOMEM;
>> - goto failed_ret;
>> + net_dev = alloc_candev(sizeof(*class_dev), tx_fifo_size);
>> + if (!net_dev) {
>> + dev_err(dev, "Failed to allocate CAN device");
>> + goto out;
>> + }
>> +
>> + class_dev = netdev_priv(net_dev);
>> + if (!class_dev) {
>> + dev_err(dev, "Failed to init netdev private");
>> + goto out;
>> }
>>
>> - priv = netdev_priv(dev);
>> - dev->irq = irq;
>> - priv->device = &pdev->dev;
>> - priv->hclk = hclk;
>> - priv->cclk = cclk;
>> - priv->can.clock.freq = clk_get_rate(cclk);
>> - priv->mram_base = mram_addr;
>> + class_dev->net = net_dev;
>> + class_dev->dev = dev;
>> + SET_NETDEV_DEV(net_dev, dev);
>>
>> - platform_set_drvdata(pdev, dev);
>> - SET_NETDEV_DEV(dev, &pdev->dev);
>> + m_can_of_parse_mram(class_dev, mram_config_vals);
>> +out:
>> + return class_dev;
>> +}
>> +EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);
>>
>> - /* Enable clocks. Necessary to read Core Release in order to determine
>> - * M_CAN version
>> - */
>> - pm_runtime_enable(&pdev->dev);
>> - ret = m_can_clk_start(priv);
>> - if (ret)
>> - goto pm_runtime_fail;
>> +int m_can_class_register(struct m_can_priv *m_can_dev)
>> +{
>> + int ret;
>> +
>> + if (m_can_dev->pm_clock_support) {
>> + pm_runtime_enable(m_can_dev->dev);
>> + ret = m_can_clk_start(m_can_dev);
>> + if (ret)
>> + goto pm_runtime_fail;
>> + }
>>
>> - ret = m_can_dev_setup(pdev, dev, addr);
>> + ret = m_can_dev_setup(m_can_dev);
>> if (ret)
>> goto clk_disable;
>>
>> - ret = register_m_can_dev(dev);
>> + ret = register_m_can_dev(m_can_dev->net);
>> if (ret) {
>> - dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
>> - KBUILD_MODNAME, ret);
>> + dev_err(m_can_dev->dev, "registering %s failed (err=%d)\n",
>> + m_can_dev->net->name, ret);
>> goto clk_disable;
>> }
>>
>> - m_can_of_parse_mram(priv, mram_config_vals);
>> + devm_can_led_init(m_can_dev->net);
>>
>> - devm_can_led_init(dev);
>> + of_can_transceiver(m_can_dev->net);
>>
>> - of_can_transceiver(dev);
>> -
>> - dev_info(&pdev->dev, "%s device registered (irq=%d, version=%d)\n",
>> - KBUILD_MODNAME, dev->irq, priv->version);
>> + dev_info(m_can_dev->dev, "%s device registered (irq=%d, version=%d)\n",
>> + KBUILD_MODNAME, m_can_dev->net->irq, m_can_dev->version);
>>
>> /* Probe finished
>> * Stop clocks. They will be reactivated once the M_CAN device is opened
>> */
>> clk_disable:
>> - m_can_clk_stop(priv);
>> + m_can_clk_stop(m_can_dev);
>> pm_runtime_fail:
>> if (ret) {
>> - pm_runtime_disable(&pdev->dev);
>> - free_candev(dev);
>> + if (m_can_dev->pm_clock_support)
>> + pm_runtime_disable(m_can_dev->dev);
>> + free_candev(m_can_dev->net);
>> }
>> -failed_ret:
>> +
>> return ret;
>> }
>> +EXPORT_SYMBOL_GPL(m_can_class_register);
>>
>> -static __maybe_unused int m_can_suspend(struct device *dev)
>> +int m_can_class_suspend(struct device *dev)
>> {
>> struct net_device *ndev = dev_get_drvdata(dev);
>> struct m_can_priv *priv = netdev_priv(ndev);
>> @@ -1708,8 +1800,9 @@ static __maybe_unused int m_can_suspend(struct device *dev)
>>
>> return 0;
>> }
>> +EXPORT_SYMBOL_GPL(m_can_class_suspend);
>>
>> -static __maybe_unused int m_can_resume(struct device *dev)
>> +int m_can_class_resume(struct device *dev)
>> {
>> struct net_device *ndev = dev_get_drvdata(dev);
>> struct m_can_priv *priv = netdev_priv(ndev);
>> @@ -1733,79 +1826,19 @@ static __maybe_unused int m_can_resume(struct device *dev)
>>
>> return 0;
>> }
>> +EXPORT_SYMBOL_GPL(m_can_class_resume);
>>
>> -static void unregister_m_can_dev(struct net_device *dev)
>> -{
>> - unregister_candev(dev);
>> -}
>> -
>> -static int m_can_plat_remove(struct platform_device *pdev)
>> -{
>> - struct net_device *dev = platform_get_drvdata(pdev);
>> -
>> - unregister_m_can_dev(dev);
>> -
>> - pm_runtime_disable(&pdev->dev);
>> -
>> - platform_set_drvdata(pdev, NULL);
>> -
>> - free_candev(dev);
>> -
>> - return 0;
>> -}
>> -
>> -static int __maybe_unused m_can_runtime_suspend(struct device *dev)
>> +void m_can_class_unregister(struct m_can_priv *m_can_dev)
>> {
>> - struct net_device *ndev = dev_get_drvdata(dev);
>> - struct m_can_priv *priv = netdev_priv(ndev);
>> + unregister_candev(m_can_dev->net);
>>
>> - clk_disable_unprepare(priv->cclk);
>> - clk_disable_unprepare(priv->hclk);
>> + m_can_clk_stop(m_can_dev);
>>
>> - return 0;
>> + free_candev(m_can_dev->net);
>> }
>> -
>> -static int __maybe_unused m_can_runtime_resume(struct device *dev)
>> -{
>> - struct net_device *ndev = dev_get_drvdata(dev);
>> - struct m_can_priv *priv = netdev_priv(ndev);
>> - int err;
>> -
>> - err = clk_prepare_enable(priv->hclk);
>> - if (err)
>> - return err;
>> -
>> - err = clk_prepare_enable(priv->cclk);
>> - if (err)
>> - clk_disable_unprepare(priv->hclk);
>> -
>> - return err;
>> -}
>> -
>> -static const struct dev_pm_ops m_can_pmops = {
>> - SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
>> - m_can_runtime_resume, NULL)
>> - SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
>> -};
>> -
>> -static const struct of_device_id m_can_of_table[] = {
>> - { .compatible = "bosch,m_can", .data = NULL },
>> - { /* sentinel */ },
>> -};
>> -MODULE_DEVICE_TABLE(of, m_can_of_table);
>> -
>> -static struct platform_driver m_can_plat_driver = {
>> - .driver = {
>> - .name = KBUILD_MODNAME,
>> - .of_match_table = m_can_of_table,
>> - .pm = &m_can_pmops,
>> - },
>> - .probe = m_can_plat_probe,
>> - .remove = m_can_plat_remove,
>> -};
>> -
>> -module_platform_driver(m_can_plat_driver);
>> +EXPORT_SYMBOL_GPL(m_can_class_unregister);
>>
>> MODULE_AUTHOR("Dong Aisheng <[email protected]>");
>> +MODULE_AUTHOR("Dan Murphy <[email protected]>");
>> MODULE_LICENSE("GPL v2");
>> MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller");
>> diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
>> new file mode 100644
>> index 000000000000..b60f27dd9f33
>> --- /dev/null
>> +++ b/drivers/net/can/m_can/m_can.h
>> @@ -0,0 +1,110 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* CAN bus driver for Bosch M_CAN controller
>> + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
>> + */
>> +
>> +#ifndef _CAN_M_CAN_H_
>> +#define _CAN_M_CAN_H_
>> +
>> +#include <linux/can/core.h>
>> +#include <linux/can/led.h>
>> +#include <linux/completion.h>
>> +#include <linux/device.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/freezer.h>
>> +#include <linux/slab.h>
>> +#include <linux/uaccess.h>
>> +#include <linux/clk.h>
>> +#include <linux/delay.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/netdevice.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/can/dev.h>
>> +#include <linux/pinctrl/consumer.h>
>> +
>> +/* m_can lec values */
>> +enum m_can_lec_type {
>> + LEC_NO_ERROR = 0,
>> + LEC_STUFF_ERROR,
>> + LEC_FORM_ERROR,
>> + LEC_ACK_ERROR,
>> + LEC_BIT1_ERROR,
>> + LEC_BIT0_ERROR,
>> + LEC_CRC_ERROR,
>> + LEC_UNUSED,
>> +};
>> +
>> +enum m_can_mram_cfg {
>> + MRAM_SIDF = 0,
>> + MRAM_XIDF,
>> + MRAM_RXF0,
>> + MRAM_RXF1,
>> + MRAM_RXB,
>> + MRAM_TXE,
>> + MRAM_TXB,
>> + MRAM_CFG_NUM,
>> +};
>> +
>> +/* address offset and element number for each FIFO/Buffer in the Message RAM */
>> +struct mram_cfg {
>> + u16 off;
>> + u8 num;
>> +};
>> +
>> +struct m_can_priv;
>> +struct m_can_ops {
>> + /* Device specific call backs */
>> + int (*clear_interrupts)(struct m_can_priv *m_can_class);
>> + u32 (*read_reg)(struct m_can_priv *m_can_class, int reg);
>> + int (*write_reg)(struct m_can_priv *m_can_class, int reg, int val);
>> + u32 (*read_fifo)(struct m_can_priv *m_can_class, int addr_offset);
>> + int (*write_fifo)(struct m_can_priv *m_can_class, int addr_offset,
>> + int val);
>> + int (*init)(struct m_can_priv *m_can_class);
>> +};
>> +
>> +struct m_can_priv {
>> + struct can_priv can;
>> + struct napi_struct napi;
>> + struct net_device *net;
>> + struct device *dev;
>> + struct clk *hclk;
>> + struct clk *cclk;
>> +
>> + struct workqueue_struct *tx_wq;
>> + struct work_struct tx_work;
>> + struct sk_buff *tx_skb;
>> +
>> + struct can_bittiming_const *bit_timing;
>> + struct can_bittiming_const *data_timing;
>> +
>> + struct m_can_ops *ops;
>> +
>> + void *device_data;
>> +
>> + int version;
>> + int freq;
>> + u32 irqstatus;
>> +
>> + int pm_clock_support;
>> + int is_peripherial;
>> +
>> + struct mram_cfg mcfg[MRAM_CFG_NUM];
>> +};
>> +
>> +struct m_can_priv *m_can_class_allocate_dev(struct device *dev);
>> +int m_can_class_register(struct m_can_priv *m_can_dev);
>> +void m_can_class_unregister(struct m_can_priv *m_can_dev);
>> +int m_can_class_get_clocks(struct m_can_priv *m_can_dev);
>> +void m_can_init_ram(struct m_can_priv *priv);
>> +void m_can_config_endisable(struct m_can_priv *priv, bool enable);
>> +
>> +int m_can_class_suspend(struct device *dev);
>> +int m_can_class_resume(struct device *dev);
>> +#endif /* _CAN_M_H_ */
>> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
>> new file mode 100644
>> index 000000000000..b02d49f9ee4c
>> --- /dev/null
>> +++ b/drivers/net/can/m_can/m_can_platform.c
>> @@ -0,0 +1,202 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// IOMapped CAN bus driver for Bosch M_CAN controller
>> +// Copyright (C) 2014 Freescale Semiconductor, Inc.
>> +// Dong Aisheng <[email protected]>
>> +//
>> +// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
>> +
>> +#include <linux/platform_device.h>
>> +
>> +#include "m_can.h"
>> +
>> +struct m_can_plat_priv {
>> + void __iomem *base;
>> + void __iomem *mram_base;
>> +};
>> +
>> +static u32 iomap_read_reg(struct m_can_priv *cdev, int reg)
>> +{
>> + struct m_can_plat_priv *priv =
>> + (struct m_can_plat_priv *)cdev->device_data;
>> +
>> + return readl(priv->base + reg);
>> +}
>> +
>> +static u32 iomap_read_fifo(struct m_can_priv *cdev, int offset)
>> +{
>> + struct m_can_plat_priv *priv =
>> + (struct m_can_plat_priv *)cdev->device_data;
>> +
>> + return readl(priv->mram_base + offset);
>> +}
>> +
>> +static int iomap_write_reg(struct m_can_priv *cdev, int reg, int val)
>> +{
>> + struct m_can_plat_priv *priv =
>> + (struct m_can_plat_priv *)cdev->device_data;
>> +
>> + writel(val, priv->base + reg);
>> +
>> + return 0;
>> +}
>> +
>> +static int iomap_write_fifo(struct m_can_priv *cdev, int offset, int val)
>> +{
>> + struct m_can_plat_priv *priv =
>> + (struct m_can_plat_priv *)cdev->device_data;
>> +
>> + writel(val, priv->mram_base + offset);
>> +
>> + return 0;
>> +}
>> +
>> +static struct m_can_ops m_can_plat_ops = {
>> + .read_reg = iomap_read_reg,
>> + .write_reg = iomap_write_reg,
>> + .write_fifo = iomap_write_fifo,
>> + .read_fifo = iomap_read_fifo,
>> +};
>> +
>> +static int m_can_plat_probe(struct platform_device *pdev)
>> +{
>> + struct m_can_priv *mcan_class;
>> + struct m_can_plat_priv *priv;
>> + struct resource *res;
>> + void __iomem *addr;
>> + void __iomem *mram_addr;
>> + int irq, ret = 0;
>> +
>> + mcan_class = m_can_class_allocate_dev(&pdev->dev);
>> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>> + if (!priv)
>> + return -ENOMEM;
>> +
>> + mcan_class->device_data = priv;
>> +
>> + m_can_class_get_clocks(mcan_class);
>> +
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
>> + addr = devm_ioremap_resource(&pdev->dev, res);
>> + irq = platform_get_irq_byname(pdev, "int0");
>> + if (IS_ERR(addr) || irq < 0) {
>> + ret = -EINVAL;
>> + goto failed_ret;
>> + }
>> +
>> + /* message ram could be shared */
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
>> + if (!res) {
>> + ret = -ENODEV;
>> + goto failed_ret;
>> + }
>> +
>> + mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
>> + if (!mram_addr) {
>> + ret = -ENOMEM;
>> + goto failed_ret;
>> + }
>> +
>> + priv->base = addr;
>> + priv->mram_base = mram_addr;
>> +
>> + mcan_class->net->irq = irq;
>> + mcan_class->pm_clock_support = 1;
>> + mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk);
>> + mcan_class->dev = &pdev->dev;
>> +
>> + mcan_class->ops = &m_can_plat_ops;
>> +
>> + mcan_class->is_peripherial = false;
>> +
>> + platform_set_drvdata(pdev, mcan_class->dev);
>> +
>> + m_can_init_ram(mcan_class);
>> +
>> + ret = m_can_class_register(mcan_class);
>> +
>> +failed_ret:
>> + return ret;
>> +}
>> +
>> +static __maybe_unused int m_can_suspend(struct device *dev)
>> +{
>> + return m_can_class_suspend(dev);
>> +}
>> +
>> +static __maybe_unused int m_can_resume(struct device *dev)
>> +{
>> + return m_can_class_resume(dev);
>> +}
>> +
>> +static int m_can_plat_remove(struct platform_device *pdev)
>> +{
>> + struct net_device *dev = platform_get_drvdata(pdev);
>> + struct m_can_priv *mcan_class = netdev_priv(dev);
>> +
>> + m_can_class_unregister(mcan_class);
>> +
>> + platform_set_drvdata(pdev, NULL);
>> +
>> + return 0;
>> +}
>> +
>> +static int __maybe_unused m_can_runtime_suspend(struct device *dev)
>> +{
>> + struct net_device *ndev = dev_get_drvdata(dev);
>> + struct m_can_priv *mcan_class = netdev_priv(ndev);
>> +
>> + m_can_class_suspend(dev);
>> +
>> + clk_disable_unprepare(mcan_class->cclk);
>> + clk_disable_unprepare(mcan_class->hclk);
>> +
>> + return 0;
>> +}
>> +
>> +static int __maybe_unused m_can_runtime_resume(struct device *dev)
>> +{
>> + struct net_device *ndev = dev_get_drvdata(dev);
>> + struct m_can_priv *mcan_class = netdev_priv(ndev);
>> + int err;
>> +
>> + err = clk_prepare_enable(mcan_class->hclk);
>> + if (err)
>> + return err;
>> +
>> + err = clk_prepare_enable(mcan_class->cclk);
>> + if (err)
>> + clk_disable_unprepare(mcan_class->hclk);
>> +
>> + m_can_class_resume(dev);
>> +
>> + return err;
>> +}
>> +
>> +static const struct dev_pm_ops m_can_pmops = {
>> + SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
>> + m_can_runtime_resume, NULL)
>> + SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
>> +};
>> +
>> +static const struct of_device_id m_can_of_table[] = {
>> + { .compatible = "bosch,m_can", .data = NULL },
>> + { /* sentinel */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, m_can_of_table);
>> +
>> +static struct platform_driver m_can_plat_driver = {
>> + .driver = {
>> + .name = KBUILD_MODNAME,
>> + .of_match_table = m_can_of_table,
>> + .pm = &m_can_pmops,
>> + },
>> + .probe = m_can_plat_probe,
>> + .remove = m_can_plat_remove,
>> +};
>> +
>> +module_platform_driver(m_can_plat_driver);
>> +
>> +MODULE_AUTHOR("Dong Aisheng <[email protected]>");
>> +MODULE_AUTHOR("Dan Murphy <[email protected]>");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DESCRIPTION("M_CAN driver for IO Mapped Bosch controllers");
>
> Wolfgang.
>
--
------------------
Dan Murphy