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

From: Wolfgang Grandegger
Date: Tue Jan 22 2019 - 09:34:11 EST

Hello Dan,

Am 22.01.19 um 14:37 schrieb Dan Murphy:
> 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 1 just changes two small locations of "m_can.c". It does not use
the new interface or even include "m_can_platform.h". Patch 2 is
well readable, especially the common code. It would be even better if
"struct can_priv" would be kept and all the functions in the original
order. That's why I suggested to do so.

> 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.

Sorry, if I confused you! My concern was about the common code in m_can.c.

>>> 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.

As I said above. Patch 1 did *not* touch "m_can.c". Therefore the
definitions above are in both files, m_can.c *and* m_can_platform.h.

>
>>> /* 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.

I know and I agree that the old "stuct m_can_priv" is not a good name.
The only reason why I suggest to keep it for the moment is to make the
changes to the common code minimal, esepcially to get rid of:

- struct m_can_priv *priv = netdev_priv(dev);
+ struct m_can_classdev *priv = netdev_priv(dev);

Well, just leave it as it is now! I can follow the changes.

>>> 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.

OK.

>>> /* 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.

OK.

>>> 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

Even if the io-mapped does not use it? Ah, you mean it does use it...
which is a bad solution, I think. This adds extra latency!

>
>>
>>> + 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.

OK.

>>>
>>> - 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

Not too bad!

Thanks,

Wolfgang.