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

[Dan Murphy <dmurphy@ti.com>]

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@ti.com>
>> ---
>>  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@freescale.com>");
>>  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