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SubjectRe: [PATCH v10 1/4] can: m_can: Create a m_can platform framework
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Hello Dan,

checkpatch still reports one "line over 80 characters".

Am 15.03.19 um 18:02 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 <dmurphy@ti.com>
> ---
>
> v10 - Fixed misspelled peripheral, moved index declaration, and added back stop
> queue on TX_BUSY in hard_xmit - https://lore.kernel.org/patchwork/patch/1050487/
>
> v9 - Added back the CSR clearing as this is needed for TCAN device, fixed clean
> function to clean index for version > 30, removed extra skb free and fixed work
> handler to handle FIFO full for perpheral devices - https://lore.kernel.org/patchwork/patch/1050120/
> 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 | 735 +++++++++++++------------
> drivers/net/can/m_can/m_can.h | 110 ++++
> drivers/net/can/m_can/m_can_platform.c | 202 +++++++
> 5 files changed, 716 insertions(+), 345 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..14c5879f6a5f 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 <b29396@freescale.com>
> - *
> - * 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 <b29396@freescale.com>
> +// 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
> @@ -347,74 +320,86 @@ 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;
> u32 val = 0;
>
> + /* Clear the Clock stop request if it was set */
> + if (cccr & CCCR_CSR)
> + cccr &= ~CCCR_CSR;
> +
> if (enable) {
> + /* Clear the Clock stop request if it was set */
> + if (cccr & CCCR_CSR)
> + cccr &= ~CCCR_CSR;
> +
> /* enable m_can configuration */
> m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT);
> udelay(5);
> @@ -430,7 +415,7 @@ 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 +423,34 @@ 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) {
> + int putidx = 0;
> +
> + net->stats.tx_errors++;
> + if (priv->version > 30)
> + putidx = ((m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQPI_MASK)
> + >> TXFQS_TFQPI_SHIFT);
> +
> + can_free_echo_skb(priv->net, putidx);
> + 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 +635,12 @@ 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 +649,8 @@ 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 +817,8 @@ 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 +836,33 @@ 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_peripheral(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 +919,9 @@ 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 +930,10 @@ 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_peripheral)
> + napi_schedule(&priv->napi);
> + else
> + m_can_rx_peripheral(dev);
> }
>
> if (priv->version == 30) {
> @@ -1155,6 +1186,9 @@ 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 +1207,7 @@ 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 +1223,17 @@ 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 +1251,26 @@ 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 +1282,79 @@ 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_peripheral)
> + 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 +1373,18 @@ 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_peripheral)
> + napi_disable(&priv->napi);
> m_can_stop(dev);
> m_can_clk_stop(priv);
> free_irq(dev->irq, dev);
> +
> + if (priv->is_peripheral) {
> + 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 +1405,15 @@ 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) {
> @@ -1451,7 +1468,13 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> netif_stop_queue(dev);
> netdev_warn(dev,
> "TX queue active although FIFO is full.");
> - return NETDEV_TX_BUSY;
> + if (priv->is_peripheral) {
> + kfree_skb(skb);
> + dev->stats.tx_dropped++;
> + return NETDEV_TX_OK;
> + } else {
> + return NETDEV_TX_BUSY;
> + }
> }
>
> /* get put index for frame */
> @@ -1492,14 +1515,114 @@ 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);
> + m_can_tx_handler(priv);
> + 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_peripheral) {
> + 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 {

Could you please add a comment here about stopping the queue early. I
would also mention that an improved version may use an array of tx_skbs
to support queueing of outgoing messages.

> + 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;
> }

At the next respin, you can then add my

Acked-by: Wolfgang Grandegger <wg@grandegger.com>

to the Patch 1/1, 1/2 and 1/4.

Thanks for your contribution and patience.

Wolfgang

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