Re: [PATCH v4 2/4] can: m_can: Migrate the m_can code to use the framework

From: Dan Murphy
Date: Tue Jan 22 2019 - 08:38:02 EST

Wolfgang

On 1/22/19 3:35 AM, Wolfgang Grandegger wrote:
> Hello,
>
> Am 17.01.19 um 21:05 schrieb Dan Murphy:
>> Migrate the m_can code to use the m_can_platform framework
>> code.
>>
>> Signed-off-by: Dan Murphy <dmurphy@xxxxxx>
>> ---
>> drivers/net/can/m_can/Kconfig | 12 +
>> drivers/net/can/m_can/Makefile | 4 +-
>> drivers/net/can/m_can/m_can.c | 764 ++++++++++++-------------
>> drivers/net/can/m_can/m_can_platform.h | 2 +-
>> 4 files changed, 374 insertions(+), 408 deletions(-)
>>
>> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
>> index 04f20dd39007..b1a9358b7660 100644
>> --- a/drivers/net/can/m_can/Kconfig
>> +++ b/drivers/net/can/m_can/Kconfig
>> @@ -1,5 +1,17 @@
>> config CAN_M_CAN
>> + tristate "Bosch M_CAN support"
>> + ---help---
>> + Say Y here if you want to support for Bosch M_CAN controller.
>> +
>> +config CAN_M_CAN_CORE
>> + depends on CAN_M_CAN
>> + tristate "Bosch M_CAN Core support"
>> + ---help---
>> + Say Y here if you want to support for Bosch M_CAN controller.
>
> Do you need that extra config? I think "CAN_M_CAN" is just fine.
>

OK I can remove the CORE. That should be built if CAN_M_CAN is selected then

>> +config CAN_M_CAN_PLATFORM
>> depends on HAS_IOMEM
>> + depends on CAN_M_CAN_CORE
>> tristate "Bosch M_CAN devices"
>> ---help---
>> Say Y here if you want to support for Bosch M_CAN controller.
>> diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
>> index 8bbd7f24f5be..04f36947ac3b 100644
>> --- a/drivers/net/can/m_can/Makefile
>> +++ b/drivers/net/can/m_can/Makefile
>> @@ -2,4 +2,6 @@
>> # Makefile for the Bosch M_CAN controller driver.
>> #
>>
>> -obj-$(CONFIG_CAN_M_CAN) += m_can.o
>> +obj-$(CONFIG_CAN_M_CAN_CORE) += m_can.o
>> +obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
>> +obj-$(CONFIG_CAN_M_CAN_TCAN4X5X) += tcan4x5x.o
>
> This file is provided in a sub-sequent patched! The code *must* compile
> for every single patch applied for bisect'ing. Looking to your first
> patch, I just realize that this is also not the case!
>
> I think it makes sense to squash patch 1 and 2.
>

Well. Patch 1 should compile on its own I will check that.

Squashing patch 1 and patch 2 made the review even more impossible.
So I made patch 1 to create the io-mapped code (which probably will not compile when enabled) and then
patch 2 was the changes to the CORE to stitch in the io-mapped code.

Patch 4 was the addition of the peripherial.

I did this because there was a comment from the RFCs I sent in that there was to much change to review for a single patch
conversion. I can squash patch 1 and patch 2 after we finish the review process prior to merging it into the tree.

That was also the comment I received from an internal review.

>> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
>> index f817b28582e9..6da0ae26138e 100644
>> --- a/drivers/net/can/m_can/m_can.c
>> +++ b/drivers/net/can/m_can/m_can.c
>> @@ -28,87 +28,14 @@
>> #include <linux/can/dev.h>
>> #include <linux/pinctrl/consumer.h>
>>
>> +#include "m_can_platform.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,
>> -};
>
> Patch 1 should have already done that!
>

Will look at it.

>> /* Core Release Register (CREL) */
>> #define CREL_REL_SHIFT 28
>> #define CREL_REL_MASK (0xF << CREL_REL_SHIFT)
>> @@ -343,72 +270,81 @@ 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_classdev *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->read_reg)
>> + ret = priv->read_reg(priv, reg);
>>
>> -static inline u32 m_can_read(const struct m_can_priv *priv, enum m_can_reg reg)
>> + return ret;
>> +}
>> +
>> +static int m_can_write(struct m_can_classdev *priv, enum m_can_reg reg, u32 val)
>> {
>> - return readl(priv->base + reg);
>> + int ret = -EINVAL;
>> +
>> + if (priv->write_reg)
>> + ret = priv->write_reg(priv, reg, val);
>> +
>> + return ret;
>> }
>>
>> -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_classdev *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->read_fifo)
>> + ret = priv->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_classdev *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->write_fifo)
>> + ret = priv->write_fifo(priv, addr_offset, val);
>> +
>> + return ret;
>
> Why not just:
>
> if (priv->write_fifo)
> return priv->write_fifo(priv, addr_offset, val);
> else
> return -EINVAL;
>
> Here and below...
>

Ack.

>> }
>>
>> -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_classdev *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->write_fifo)
>> + ret = priv->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_classdev *priv, u32 fgi, u32 offset)
>> +{
>> + u32 addr_offset = priv->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE + offset;
>> + u32 ret = -EINVAL;
>> +
>> + if (priv->read_fifo)
>> + ret = priv->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_classdev *priv)
>> {
>> - return !!(m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQF);
>> + 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_classdev *priv, bool enable)
>> {
>> u32 cccr = m_can_read(priv, M_CAN_CCCR);
>> u32 timeout = 10;
>> @@ -433,7 +369,7 @@ 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--;
>> @@ -441,13 +377,13 @@ 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_classdev *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_classdev *priv)
>> {
>> m_can_write(priv, M_CAN_ILE, 0x0);
>> }
>> @@ -455,7 +391,7 @@ static inline void m_can_disable_all_interrupts(const struct m_can_priv *priv)
>> 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 *priv = netdev_priv(dev);
>> struct canfd_frame *cf;
>> struct sk_buff *skb;
>> u32 id, fgi, dlc;
>> @@ -512,7 +448,7 @@ 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 *priv = netdev_priv(dev);
>> u32 pkts = 0;
>> u32 rxfs;
>>
>> @@ -565,7 +501,7 @@ 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 *priv = netdev_priv(dev);
>> struct net_device_stats *stats = &dev->stats;
>> struct can_frame *cf;
>> struct sk_buff *skb;
>> @@ -622,7 +558,7 @@ 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 *priv = netdev_priv(dev);
>
> Back to the naming: You use "priv" here because I only wanted to see
> minimal changes to the m_can code. Why not also re-using "struct
> m_can_priv" for the moment and use:
>
> m_can_register(struct m_can_priv priv);
>
> Later-on, when the development has settled, we could introduce betetr
> names. What do you think?
>

m_can_classdev is the common struct for the devices that register.
m_can_priv is the private struct for the device itself. If you look at the m_can_priv
struct and the tcan_priv struct they contain very different variables.

This is why I changed this to the common class struct so that the m_can common code has a common
struct.

>> unsigned int ecr;
>>
>> ecr = m_can_read(priv, M_CAN_ECR);
>> @@ -632,28 +568,32 @@ static int __m_can_get_berr_counter(const struct net_device *dev,
>> return 0;
>> }
>>
>> -static int m_can_clk_start(struct m_can_priv *priv)
>> +static int m_can_clk_start(struct m_can_classdev *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;
>> }
>>
>> return 0;
>> }
>>
>> -static void m_can_clk_stop(struct m_can_priv *priv)
>> +static void m_can_clk_stop(struct m_can_classdev *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,
>> struct can_berr_counter *bec)
>> {
>> - struct m_can_priv *priv = netdev_priv(dev);
>> + struct m_can_classdev *priv = netdev_priv(dev);
>> int err;
>>
>> err = m_can_clk_start(priv);
>> @@ -670,7 +610,7 @@ 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 *priv = netdev_priv(dev);
>> struct net_device_stats *stats = &dev->stats;
>> struct can_frame *cf;
>> struct sk_buff *skb;
>> @@ -744,25 +684,22 @@ 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 *priv = netdev_priv(dev);
>> int work_done = 0;
>>
>> - if ((psr & PSR_EW) &&
>> - (priv->can.state != CAN_STATE_ERROR_WARNING)) {
>> + if ((psr & PSR_EW) && priv->can.state != CAN_STATE_ERROR_WARNING) {
>
> This is an unrelated cosmetic change. We should avoid them here.
> Could be done later-on with an extra patch.
>

Ack

>> 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)) {
>> + if ((psr & PSR_EP) && priv->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)) {
>> + if ((psr & PSR_BO) && priv->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);
>> @@ -797,7 +734,7 @@ 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 *priv = netdev_priv(dev);
>> int work_done = 0;
>>
>> if (irqstatus & IR_RF0L)
>> @@ -814,10 +751,9 @@ 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);
>> + struct m_can_classdev *priv = netdev_priv(dev);
>> int work_done = 0;
>> u32 irqstatus, psr;
>>
>> @@ -834,13 +770,33 @@ 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(struct net_device *dev)
>
> m_can_rx_peripheral ?
>

Ack

>> +{
>> + struct m_can_classdev *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_classdev *priv = netdev_priv(dev);
>> + int work_done = 0;
>> +
>> + 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;
>> }
>>
>> @@ -852,7 +808,7 @@ 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 *priv = netdev_priv(dev);
>> struct net_device_stats *stats = &dev->stats;
>>
>> /* read tx event fifo status */
>> @@ -885,7 +841,7 @@ 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 *priv = netdev_priv(dev);
>> struct net_device_stats *stats = &dev->stats;
>> u32 ir;
>>
>> @@ -905,7 +861,10 @@ 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(dev);
>> }
>>
>> if (priv->version == 30) {
>> @@ -927,6 +886,9 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
>> }
>> }
>>
>> + if (priv->clr_dev_interrupts)
>> + priv->clr_dev_interrupts(priv);
>> +
>> return IRQ_HANDLED;
>> }
>>
>> @@ -980,7 +942,7 @@ 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);
>> + struct m_can_classdev *priv = netdev_priv(dev);
>> const struct can_bittiming *bt = &priv->can.bittiming;
>> const struct can_bittiming *dbt = &priv->can.data_bittiming;
>> u16 brp, sjw, tseg1, tseg2;
>> @@ -1053,7 +1015,7 @@ 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 *priv = netdev_priv(dev);
>> u32 cccr, test;
>>
>> m_can_config_endisable(priv, true);
>> @@ -1165,7 +1127,7 @@ static void m_can_chip_config(struct net_device *dev)
>>
>> static void m_can_start(struct net_device *dev)
>> {
>> - struct m_can_priv *priv = netdev_priv(dev);
>> + struct m_can_classdev *priv = netdev_priv(dev);
>>
>> /* basic m_can configuration */
>> m_can_chip_config(dev);
>> @@ -1194,20 +1156,17 @@ 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_classdev *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);
>>
>> @@ -1225,18 +1184,22 @@ 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_classdev *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;
>> + }
>
> This change is also unrelated. Should be done in an extra patch.
>

Actually it is not. readl_poll_timeout is not supported in peripherial devices.
I had to re-write this to poll the periherial devices. It worked fine for io-mapped devices.

>> /* Clear NISO */
>> cccr_reg &= ~(CCCR_NISO);
>> @@ -1248,112 +1211,100 @@ 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_classdev *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;
>
> Should'nt that go to m_can_platform.c?
>

No. This is the original code. I added the ability for the peripherials to over ride
the default bit timings provided.

I had to do this because TCAN needed different bit and data timings.

>> 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;
>
>> 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)
>
> This function has been moved around making it difficult to understand
> the diffs.
>

Yes it had to be broken up as some of the calls needed to be done in the
peripherial and some are common and can be done here.

>> -{
>> - 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->device_init)
>> + m_can_dev->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)
>> {
>> - struct m_can_priv *priv = netdev_priv(dev);
>> + struct m_can_classdev *priv = netdev_priv(dev);
>>
>> /* disable all interrupts */
>> m_can_disable_all_interrupts(priv);
>> @@ -1364,13 +1315,16 @@ static void m_can_stop(struct net_device *dev)
>>
>> static int m_can_close(struct net_device *dev)
>> {
>> - struct m_can_priv *priv = netdev_priv(dev);
>> + struct m_can_classdev *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);
>> + destroy_workqueue(priv->wq);
>
> if (priv->is_peripherial) ?

This workqueue is created for both peripherial and io-mapped

>
>> + priv->wq = NULL;
>> close_candev(dev);
>> can_led_event(dev, CAN_LED_EVENT_STOP);
>>
>> @@ -1379,7 +1333,7 @@ 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 *priv = netdev_priv(dev);
>> /*get wrap around for loopback skb index */
>> unsigned int wrap = priv->can.echo_skb_max;
>> int next_idx;
>> @@ -1391,18 +1345,17 @@ 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)
> Ditto
>

Same as above

>
>> +static void m_can_tx_work_handler(struct work_struct *ws)
>
> I think you need a common function to do the tx.
>

This is the common function that was in the original code.

>
>> {
>> - struct m_can_priv *priv = netdev_priv(dev);
>> - struct canfd_frame *cf = (struct canfd_frame *)skb->data;
>> + struct m_can_classdev *priv = container_of(ws, struct m_can_classdev,
>> + tx_work);
>> + struct canfd_frame *cf = (struct canfd_frame *)priv->skb->data;
>> + struct net_device *dev = priv->net;
>> + struct sk_buff *skb = priv->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) {
>> @@ -1431,7 +1384,8 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
>> can_put_echo_skb(skb, dev, 0);
>>
>> if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
>> - cccr = m_can_read(priv, M_CAN_CCCR);
>> + /*cccr = m_can_read(priv, M_CAN_CCCR);*/
>> + cccr = 0;
>
> Unrelated change.
>

Ah yes debug code. Can be removed.

>> cccr &= ~(CCCR_CMR_MASK << CCCR_CMR_SHIFT);
>> if (can_is_canfd_skb(skb)) {
>> if (cf->flags & CANFD_BRS)
>> @@ -1457,7 +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 */
>> @@ -1498,14 +1452,87 @@ 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 netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
>> + struct net_device *dev)
>> +{
>> + struct m_can_classdev *priv = netdev_priv(dev);
>> +
>> + if (can_dropped_invalid_skb(dev, skb))
>> + return NETDEV_TX_BUSY;
>> +
>> + netif_stop_queue(dev);
>
> if (!priv->is_peripheral) {
> m_can_tx(priv, skb);
> } else {
> netif_stop_queue(dev);
> priv->skb = skb;
> queue_work(priv->wq, &priv->tx_work);
> }
>
> I think stopping the queue here is still experimental.
>
>> return NETDEV_TX_OK;
>> }
>>
>> +static int m_can_open(struct net_device *dev)
>> +{
>> + struct m_can_classdev *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;
>> + }
>> +
>
> if (priv->is_peripheral) {
>

Not here this is needed. It is original code

>> + priv->wq = alloc_workqueue("mcan_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM,
>> + 0);
>> + if (!priv->wq) {
>> + err = -ENOMEM;
>> + goto out_wq_fail;
>> + }
>> +
>> + INIT_WORK(&priv->tx_work, m_can_tx_work_handler);
>
> }
>
>> + /* register interrupt handler */
>> + if (priv->is_peripherial)
>> + 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:
>> + destroy_workqueue(priv->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,
>> @@ -1521,21 +1548,7 @@ 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,
>> +static void m_can_of_parse_mram(struct m_can_classdev *priv,
>> const u32 *mram_config_vals)
>> {
>> priv->mcfg[MRAM_SIDF].off = mram_config_vals[0];
>> @@ -1562,9 +1575,8 @@ 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,
>> @@ -1572,63 +1584,55 @@ 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_classdev *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_core_get_clocks(struct m_can_classdev *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_core_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_classdev *m_can_core_allocate_dev(struct device *dev)
>> +{
>> + struct m_can_classdev *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
>> @@ -1637,69 +1641,77 @@ 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");
>
> No error message in case of ENOMEM. It makes it worse. Also, it's an
> unrelated change.
>

Most likely a copy and paste from original code.

>> + 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 = netdev_priv(net_dev);
>> + if (!class_dev) {
>> + dev_err(dev, "Failed to init netdev private");
>> + goto out;
>> + }
>
> WARN_ON_ONECE() ?
>
That would be an unrelated change this is a copy/paste from original code.

>>
>> - platform_set_drvdata(pdev, dev);
>> - SET_NETDEV_DEV(dev, &pdev->dev);
>> + class_dev->net = net_dev;
>> + class_dev->dev = dev;
>> + SET_NETDEV_DEV(net_dev, 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;
>> + m_can_of_parse_mram(class_dev, mram_config_vals);
>> +out:
>> + return class_dev;
>> +}
>> +EXPORT_SYMBOL_GPL(m_can_core_allocate_dev);
>> +
>> +int m_can_core_register(struct m_can_classdev *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(dev);
>> + devm_can_led_init(m_can_dev->net);
>>
>> - of_can_transceiver(dev);
>> + of_can_transceiver(m_can_dev->net);
>>
>> - 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_core_register);
>>
>> -static __maybe_unused int m_can_suspend(struct device *dev)
>> +int m_can_core_suspend(struct device *dev)
>> {
>> struct net_device *ndev = dev_get_drvdata(dev);
>> - struct m_can_priv *priv = netdev_priv(ndev);
>> + struct m_can_classdev *priv = netdev_priv(ndev);
>>
>> if (netif_running(ndev)) {
>> netif_stop_queue(ndev);
>> @@ -1714,11 +1726,12 @@ static __maybe_unused int m_can_suspend(struct device *dev)
>>
>> return 0;
>> }
>> +EXPORT_SYMBOL_GPL(m_can_core_suspend);
>>
>> -static __maybe_unused int m_can_resume(struct device *dev)
>> +int m_can_core_resume(struct device *dev)
>> {
>> struct net_device *ndev = dev_get_drvdata(dev);
>> - struct m_can_priv *priv = netdev_priv(ndev);
>> + struct m_can_classdev *priv = netdev_priv(ndev);
>>
>> pinctrl_pm_select_default_state(dev);
>>
>> @@ -1739,78 +1752,17 @@ static __maybe_unused int m_can_resume(struct device *dev)
>>
>> return 0;
>> }
>> +EXPORT_SYMBOL_GPL(m_can_core_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_core_unregister(struct m_can_classdev *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_core_unregister);
>>
>> MODULE_AUTHOR("Dong Aisheng <b29396@xxxxxxxxxxxxx>");
>> MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/net/can/m_can/m_can_platform.h b/drivers/net/can/m_can/m_can_platform.h
>> index 97e90dd79613..c3dd301756ba 100644
>> --- a/drivers/net/can/m_can/m_can_platform.h
>> +++ b/drivers/net/can/m_can/m_can_platform.h
>> @@ -156,7 +156,7 @@ int m_can_core_register(struct m_can_classdev *m_can_dev);
>> void m_can_core_unregister(struct m_can_classdev *m_can_dev);
>> int m_can_core_get_clocks(struct m_can_classdev *m_can_dev);
>> void m_can_init_ram(struct m_can_classdev *priv);
>> -void m_can_config_endisable(const struct m_can_classdev *priv, bool enable);
>> +void m_can_config_endisable(struct m_can_classdev *priv, bool enable);
>>
>> int m_can_core_suspend(struct device *dev);
>> int m_can_core_resume(struct device *dev);
>
> If you fix the issues with "is_peripheral" and the TX function, it
> should already work on standard M_CAN devices as before... at least in
> theory!
>

It does work on the io-mapped devices. There may be some issues but we did run the test
and it at least did not bug check.

Still testing the io-mapped code though

> Wolfgang.
>


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