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SubjectRe: [PATCH v9 1/4] can: m_can: Create a m_can platform framework
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Hello

On 3/14/19 2:26 AM, Wolfgang Grandegger wrote:
> Hello Dan,
>
> we are close...
>
> Am 13.03.19 um 17:26 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>
>> ---
>>
>> 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 | 733 +++++++++++++------------
>> drivers/net/can/m_can/m_can.h | 110 ++++
>> drivers/net/can/m_can/m_can_platform.c | 202 +++++++
>> 5 files changed, 714 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..56336aefc567 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 +423,33 @@ 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);
>> + int putidx = 0;
>
> Can you please move this declaration in the if block below.
>

Ack.

>> +
>> + if (priv->tx_skb) {
>> + 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 +634,12 @@ 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 +648,8 @@ 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 +816,8 @@ 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 +835,33 @@ 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 +918,9 @@ 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 +929,10 @@ 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 +1185,9 @@ 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 +1206,7 @@ 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 +1222,17 @@ 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 +1250,26 @@ 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 +1281,79 @@ 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 +1372,18 @@ 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 +1404,15 @@ 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 +1467,13 @@ 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_peripherial) {
>> + kfree_skb(skb);
>> + dev->stats.tx_dropped++;
>> + return NETDEV_TX_OK;
>> + } else {
>> + return NETDEV_TX_BUSY;
>> + }
>> }
>>
>> /* get put index for frame */
>> @@ -1492,14 +1514,113 @@ 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_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;
>> + queue_work(priv->tx_wq, &priv->tx_work);
>
> You removed "netif_stop_queue(cdev->net)" here. Does that work with just
> *one* "tx_skb"? I think you need an array then!? I'm afraid, this will
> require quite some changes and you should also measure the benefit of
> queuing outgoing messages first. For the time being, it would be fine
> for me to stop the queue here and add an appropriate comment.
>

Yes I removed this in favor of allowing the work handler to stop the queue.

If the version is < 30 then the queue is stopped immediately. If the version > 30 then the queue is
only stopped if FIFO is full.

I did see the message "tcan4x5x spi1.0 can0: hard_xmit called while tx busy"
more with no gap and no polling in the cangen request.

> BTW, how big is the FIFO size on your system:
>

This value is set to 1.

> tx_fifo_size = mram_config_vals[7];
>


Dan
<snip>
>
> Wolfgang
>


--
------------------
Dan Murphy

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