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Date: Thu, 28 Feb 2019 11:57:55 -0600
From: Dan Murphy <dmurphy@...com>
To: Wolfgang Grandegger <wg@...ndegger.com>, <mkl@...gutronix.de>,
<davem@...emloft.net>
CC: <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/5] can: m_can: Migrate the m_can code to use the
framework
Wolfgang
On 2/28/19 11:33 AM, Wolfgang Grandegger wrote:
> Am 14.02.19 um 19:27 schrieb Dan Murphy:
>> Migrate the m_can code to use the m_can_platform framework
>> code.
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> ---
>>
>> v5 - Updated copyright, change m_can_classdev to m_can_priv, removed extra
>> KCONFIG flag - https://lore.kernel.org/patchwork/patch/1033095/
>>
>> drivers/net/can/m_can/Kconfig | 8 +-
>> drivers/net/can/m_can/Makefile | 1 +
>> drivers/net/can/m_can/m_can.c | 745 ++++++++++++++++-----------------
>> 3 files changed, 367 insertions(+), 387 deletions(-)
>>
>> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
>> index 04f20dd39007..66e31022a5fa 100644
>> --- a/drivers/net/can/m_can/Kconfig
>> +++ b/drivers/net/can/m_can/Kconfig
>> @@ -1,5 +1,11 @@
>> config CAN_M_CAN
>> + tristate "Bosch M_CAN support"
>> + ---help---
>> + Say Y here if you want to support for Bosch M_CAN controller.
>
> Typo?
>
Maybe like you pointed out to update the help.
>> +
>> +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.
>
> Please update the help.
Ack
>
>> 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..2ceccb870557 100644
>> --- a/drivers/net/can/m_can/m_can.c
>> +++ b/drivers/net/can/m_can/m_can.c
>> @@ -1,20 +1,16 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// CAN bus driver for Bosch M_CAN controller
>> +// Copyright (C) 2014 Freescale Semiconductor, Inc.
>> +// Dong Aisheng <b29396@...escale.com>
>> +// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
>> +
>> /*
>> - * CAN bus driver for Bosch M_CAN controller
>> - *
>> - * Copyright (C) 2014 Freescale Semiconductor, Inc.
>> - * Dong Aisheng <b29396@...escale.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>
>> @@ -28,87 +24,14 @@
>> #include <linux/can/dev.h>
>> #include <linux/pinctrl/consumer.h>
>>
>> +#include "m_can.h"
>> +
>> /* napi related */
>> #define M_CAN_NAPI_WEIGHT 64
>>
>> /* message ram configuration data length */
>> #define MRAM_CFG_LEN 8
>>
>> -/* registers definition */
>> -enum m_can_reg {
>> - M_CAN_CREL = 0x0,
>> - M_CAN_ENDN = 0x4,
>> - M_CAN_CUST = 0x8,
>> - M_CAN_DBTP = 0xc,
>> - M_CAN_TEST = 0x10,
>> - M_CAN_RWD = 0x14,
>> - M_CAN_CCCR = 0x18,
>> - M_CAN_NBTP = 0x1c,
>> - M_CAN_TSCC = 0x20,
>> - M_CAN_TSCV = 0x24,
>> - M_CAN_TOCC = 0x28,
>> - M_CAN_TOCV = 0x2c,
>> - M_CAN_ECR = 0x40,
>> - M_CAN_PSR = 0x44,
>> -/* TDCR Register only available for version >=3.1.x */
>> - M_CAN_TDCR = 0x48,
>> - M_CAN_IR = 0x50,
>> - M_CAN_IE = 0x54,
>> - M_CAN_ILS = 0x58,
>> - M_CAN_ILE = 0x5c,
>> - M_CAN_GFC = 0x80,
>> - M_CAN_SIDFC = 0x84,
>> - M_CAN_XIDFC = 0x88,
>> - M_CAN_XIDAM = 0x90,
>> - M_CAN_HPMS = 0x94,
>> - M_CAN_NDAT1 = 0x98,
>> - M_CAN_NDAT2 = 0x9c,
>> - M_CAN_RXF0C = 0xa0,
>> - M_CAN_RXF0S = 0xa4,
>> - M_CAN_RXF0A = 0xa8,
>> - M_CAN_RXBC = 0xac,
>> - M_CAN_RXF1C = 0xb0,
>> - M_CAN_RXF1S = 0xb4,
>> - M_CAN_RXF1A = 0xb8,
>> - M_CAN_RXESC = 0xbc,
>> - M_CAN_TXBC = 0xc0,
>> - M_CAN_TXFQS = 0xc4,
>> - M_CAN_TXESC = 0xc8,
>> - M_CAN_TXBRP = 0xcc,
>> - M_CAN_TXBAR = 0xd0,
>> - M_CAN_TXBCR = 0xd4,
>> - M_CAN_TXBTO = 0xd8,
>> - M_CAN_TXBCF = 0xdc,
>> - M_CAN_TXBTIE = 0xe0,
>> - M_CAN_TXBCIE = 0xe4,
>> - M_CAN_TXEFC = 0xf0,
>> - M_CAN_TXEFS = 0xf4,
>> - 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,
>> -};
>> -
>> -enum m_can_mram_cfg {
>> - MRAM_SIDF = 0,
>> - MRAM_XIDF,
>> - MRAM_RXF0,
>> - MRAM_RXF1,
>> - MRAM_RXB,
>> - MRAM_TXE,
>> - MRAM_TXB,
>> - MRAM_CFG_NUM,
>> -};
>> -
>> /* Core Release Register (CREL) */
>> #define CREL_REL_SHIFT 28
>> #define CREL_REL_MASK (0xF << CREL_REL_SHIFT)
>> @@ -343,77 +266,89 @@ enum m_can_mram_cfg {
>> #define TX_BUF_MM_MASK (0xff << TX_BUF_MM_SHIFT)
>>
>> /* Tx event FIFO Element */
>> -/* E1 */
>> #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;
>> -};
>> +static u32 m_can_read(struct m_can_priv *priv, enum m_can_reg reg)
>> +{
>> + u32 ret = -EINVAL;
>>
>> -/* 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];
>> -};
>> + if (priv->ops->read_reg)
>> + ret = priv->ops->read_reg(priv, reg);
>> +
>> + return ret;
>> +}
>>
>> -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);
>> + int ret = -EINVAL;
>> +
>> + if (priv->ops->write_reg)
>> + ret = priv->ops->write_reg(priv, reg, val);
>> +
>> + return ret;
>
> Why not just:
>
> if (priv->ops->write_reg)
> return priv->ops->write_reg(priv, reg, val);
> else
> return -EINVAL;
>
> Here and below.
>
ACK
>> }
>>
>> -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;
>> + u32 ret = -EINVAL;
>> +
>> + if (priv->ops->read_fifo)
>> + ret = priv->ops->read_fifo(priv, addr_offset);
>> +
>> + return ret;
>> }
>>
>> -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;
>> + u32 ret = -EINVAL;
>> +
>> + if (priv->ops->write_fifo)
>> + ret = priv->ops->write_fifo(priv, addr_offset, val);
>> +
>> + return ret;
>> }
>>
>> -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);
>> + u32 ret = 0;
>> +
>> + if (priv->ops->write_fifo)
>> + ret = priv->ops->write_fifo(priv, fpi, val);
>> +
>> + return ret;
>> }
>>
>> -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;
>> + u32 ret = -EINVAL;
>> +
>> + if (priv->ops->read_fifo)
>> + ret = priv->ops->read_fifo(priv, addr_offset);
>> +
>> + return ret;
>> }
>>
>> -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;
>>
>> + if (cccr & CCCR_CSR)
>> + cccr &= ~CCCR_CSR;
>> +
>> if (enable) {
>> /* enable m_can configuration */
>> m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT);
>> @@ -430,7 +365,7 @@ 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--;
>> @@ -438,13 +373,13 @@ 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);
>> }
>> @@ -633,9 +568,12 @@ 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 +582,8 @@ 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 +750,8 @@ 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 +769,33 @@ 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 = 0;
>
> Is the pre-initialization needed?
>
No when I copied the function the work_done was pre-initialized.
I can remove it.
>>
>> + 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;
>> }
>>
>> @@ -902,7 +860,10 @@ 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) {
>> @@ -924,6 +885,9 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
>> }
>> }
>>
>> + if (priv->ops->clr_dev_interrupts)
>> + priv->ops->clr_dev_interrupts(priv);
>
> post_irq _handler?
>
I can clear them on entry as well
>> +
>> return IRQ_HANDLED;
>> }
>>
>> @@ -1155,6 +1119,9 @@ static void m_can_chip_config(struct net_device *dev)
>> m_can_set_bittiming(dev);
>>
>> m_can_config_endisable(priv, false);
>> +
>> + if (priv->ops->device_init)
>> + priv->ops->device_init(priv);
>> }
>>
>> static void m_can_start(struct net_device *dev)
>> @@ -1188,20 +1155,17 @@ 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 +1183,22 @@ 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;
>> + }
>
> There is no break and delay in the loop? What was the reason why you
> can't use readl_poll_timeout()?
>
OK a break if NISO is supported then and probably could add a 1us delay original code on
line 1232 had no delay but timeout at 10us.
readl_poll_timeout is for iomapped devices. How would this work for peripherial devices?
>>
>> /* Clear NISO */
>> cccr_reg &= ~(CCCR_NISO);
>> @@ -1242,107 +1210,95 @@ 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 =
>> + if (m_can_dev->bit_timing)
>> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing;
>> + else
>> + m_can_dev->can.bittiming_const =
>> + &m_can_bittiming_const_30X;
>> + if (m_can_dev->data_timing)
>> + m_can_dev->can.data_bittiming_const =
>> + m_can_dev->data_timing;
>> + else
>> + m_can_dev->can.data_bittiming_const =
>> &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 =
>> + if (m_can_dev->bit_timing)
>> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing;
>> + else
>> + m_can_dev->can.bittiming_const =
>> + &m_can_bittiming_const_31X;
>> + if (m_can_dev->data_timing)
>> + m_can_dev->can.data_bittiming_const =
>> + m_can_dev->data_timing;
>> + else
>> + m_can_dev->can.data_bittiming_const =
>> &m_can_data_bittiming_const_31X;
>> break;
>> case 32:
>> - priv->can.bittiming_const = &m_can_bittiming_const_31X;
>> - priv->can.data_bittiming_const =
>> + if (m_can_dev->bit_timing)
>> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing;
>> + else
>> + m_can_dev->can.bittiming_const =
>> + &m_can_bittiming_const_31X;
>> +
>> + if (m_can_dev->data_timing)
>> + m_can_dev->can.data_bittiming_const =
>> + m_can_dev->data_timing;
>> + else
>> + m_can_dev->can.data_bittiming_const =
>> &m_can_data_bittiming_const_31X;
>> - priv->can.ctrlmode_supported |= (m_can_niso_supported(priv)
>> +
>> + m_can_dev->can.ctrlmode_supported |=
>> + (m_can_niso_supported(m_can_dev)
>> ? CAN_CTRLMODE_FD_NON_ISO
>> : 0);
>
> if (m_can_niso_supported(m_can_dev))
> m_can_dev->can.ctrlmode_supported |=
> CAN_CTRLMODE_FD_NON_ISO;
>
This would be a change from original source line 1295. Attempted to minimize deltas from original.
>> 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->device_init)
>> + m_can_dev->ops->device_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 +1317,17 @@ 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) {
>> + destroy_workqueue(priv->wq);
>> + priv->wq = NULL;
>> + }
>> +
>> close_candev(dev);
>> can_led_event(dev, CAN_LED_EVENT_STOP);
>>
>> @@ -1385,18 +1348,15 @@ 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 void 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->skb->data;
>> + struct net_device *dev = priv->net;
>> + struct sk_buff *skb = priv->skb;
>
> Maybe "tx_skb" is a clearer member name..
Again this was named skb to minimize deltas from original code.
skb was passed into the start_xmit function and used throughout the function.
Since there was little delta in this function I opt'd to keep the names as is.
>
>> 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 +1411,7 @@ 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;
>> + return;
>> }
>>
>> /* get put index for frame */
>> @@ -1492,14 +1452,101 @@ 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);
>> + }
>> +}
>> +
>> +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);
>> +}
>> +
>> +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;
>> +
>> + priv->skb = skb;
>> + if (priv->is_peripherial) {
>> + netif_stop_queue(priv->net);
>> + queue_work(priv->wq, &priv->tx_work);
>
> s/wq/tx_wq/ ?
This is fine.
Dan
<snip>>>
>
> Wolfgang
>
--
------------------
Dan Murphy
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