[PATCH 00/16] Support for Eberspächer Flexcard DCAN function

[PATCH 00/16] Support for Eberspächer Flexcard DCAN function

[Benedikt Spranger]

The Eberspächer Flexcard is a multifunctional PCI Mezzanine Card. This
patch-series adds support for the DCAN function. The Flexcard supports
up too 8 CAN devices and has some CAN related special features:
- own FIFO per device
- DMA for receiving CAN frames
- Firmware tracks CAN echo packets

Benedikt Spranger (16):
  c_can_platform: add FlexCard D-CAN support
  c_can: add generic D-CAN RAM initialization support
  c_can: simplify arbitration register handling
  c_can: fix receive buffer configuration
  c_can: use 32 bit access for D_CAN
  c_can: consider set bittiming may fail
  c_can: reconfigre message objects after leaving init state
  c_can: Add FlexCard CAN TX fifo support
  c_can: expicit 32bit access on D_CAN to message buffer data register
  c_can: add 16bit align 32bit access functions
  c_can: stop netqueue if hardware is busy
  c_can: Add flag to disable automatic retransmission of CAN frames
  c_can: flexcard: add ioctl to reset FIFO message object
  flexcard: can: CAN local loopback using SKB pflags
  flexcard: can: Configure CAN loopback packages (TXACK)
  c_can: fix TX packet accounting

 drivers/net/can/c_can/c_can.c          | 383 ++++++++++++++++++++++++++-------
 drivers/net/can/c_can/c_can.h          |   8 +
 drivers/net/can/c_can/c_can_platform.c | 191 +++++++++++++++-
 include/uapi/linux/can/netlink.h       |   2 +
 include/uapi/linux/can/raw.h           |  20 ++
 net/can/raw.c                          |  22 +-
 6 files changed, 526 insertions(+), 100 deletions(-)

-- 
1.8.4.rc3

[PATCH 01/16] c_can_platform: add FlexCard D-CAN support

[Benedikt Spranger]

FlexCard supports up to 8 D-CAN devices with a shared DMA-capable receive
function. Add support for FlexCard D-CAN.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.h          |   1 +
 drivers/net/can/c_can/c_can_platform.c | 149 ++++++++++++++++++++++++++++++++-
 2 files changed, 148 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index d2e1c21..d2e2d20 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -148,6 +148,7 @@ enum c_can_dev_id {
 	BOSCH_C_CAN_PLATFORM,
 	BOSCH_C_CAN,
 	BOSCH_D_CAN,
+	BOSCH_D_CAN_FLEXCARD,
 };
 
 /* c_can private data structure */
diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index c6f838d..43a3e3f 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -32,6 +32,7 @@
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/flexcard.h>
 
 #include <linux/can/dev.h>
 
@@ -81,6 +82,112 @@ static void c_can_hw_raminit(const struct c_can_priv *priv, bool enable)
 	writel(val, priv->raminit_ctrlreg);
 }
 
+static int c_can_rx_pkt(void *p, void *data, size_t len)
+{
+	struct net_device *dev = p;
+	struct net_device_stats *stats = &dev->stats;
+	struct fc_packet_buf *pb = data;
+	union fc_packet_types *pt = &pb->packet;
+	struct can_frame *frame;
+	struct sk_buff *skb;
+	u32 flags, id, state, type;
+
+	switch (le32_to_cpu(pb->header.type)) {
+	case fc_packet_type_can:
+		skb = alloc_can_skb(dev, &frame);
+		if (!skb) {
+			stats->rx_dropped++;
+			return -ENOMEM;
+		}
+
+		id = le32_to_cpu(pt->can_packet.id);
+		flags = le32_to_cpu(pt->can_packet.flags);
+
+		if (id & BIT(29))
+			frame->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
+		else
+			frame->can_id = id & CAN_SFF_MASK;
+
+		if (flags & BIT(13))
+			frame->can_id |= CAN_RTR_FLAG;
+		frame->can_dlc = (flags >> 8) & 0xf;
+		memcpy(frame->data, pt->can_packet.data, frame->can_dlc);
+		netif_receive_skb(skb);
+
+		stats->rx_packets++;
+		stats->rx_bytes += frame->can_dlc;
+		break;
+
+	case fc_packet_type_can_error:
+		stats->rx_errors++;
+
+		skb = alloc_can_err_skb(dev, &frame);
+		if (!skb)
+			return -ENOMEM;
+
+		type = le32_to_cpu(pt->can_error_packet.type);
+		state = le32_to_cpu(pt->can_error_packet.state);
+
+		switch (state) {
+		case fc_can_state_warning:
+			frame->data[1] |= CAN_ERR_CRTL_RX_WARNING;
+			frame->data[1] |= CAN_ERR_CRTL_TX_WARNING;
+			frame->can_id |= CAN_ERR_CRTL;
+			break;
+		case fc_can_state_error_passive:
+			frame->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
+			frame->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
+			frame->can_id |= CAN_ERR_CRTL;
+			break;
+		case fc_can_state_bus_off:
+			frame->can_id |= CAN_ERR_BUSOFF;
+			break;
+		}
+
+		switch (type) {
+		case fc_can_error_stuff:
+			frame->data[2] |= CAN_ERR_PROT_STUFF;
+			frame->can_id |= CAN_ERR_PROT;
+			break;
+		case fc_can_error_form:
+			frame->data[2] |= CAN_ERR_PROT_FORM;
+			frame->can_id |= CAN_ERR_PROT;
+			break;
+		case fc_can_error_acknowledge:
+			frame->can_id |= CAN_ERR_ACK;
+			break;
+		case fc_can_error_bit1:
+			frame->data[2] |= CAN_ERR_PROT_BIT1;
+			frame->can_id |= CAN_ERR_PROT;
+			break;
+		case fc_can_error_bit0:
+			frame->data[2] |= CAN_ERR_PROT_BIT0;
+			frame->can_id |= CAN_ERR_PROT;
+			break;
+		case fc_can_error_crc:
+			frame->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
+			frame->can_id |= CAN_ERR_PROT;
+			break;
+		case fc_can_error_parity:
+			frame->data[1] |= CAN_ERR_PROT_UNSPEC;
+			frame->can_id |= CAN_ERR_CRTL;
+			break;
+		}
+		frame->data[5] = pt->can_error_packet.rx_error_counter;
+		frame->data[6] = pt->can_error_packet.tx_error_counter;
+
+		stats->rx_bytes += frame->can_dlc;
+		stats->rx_packets++;
+
+		netif_receive_skb(skb);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static struct platform_device_id c_can_id_table[] = {
 	[BOSCH_C_CAN_PLATFORM] = {
 		.name = KBUILD_MODNAME,
@@ -93,6 +200,10 @@ static struct platform_device_id c_can_id_table[] = {
 	[BOSCH_D_CAN] = {
 		.name = "d_can",
 		.driver_data = BOSCH_D_CAN,
+	},
+	[BOSCH_D_CAN_FLEXCARD] = {
+		.name = "flexcard-d_can",
+		.driver_data = BOSCH_D_CAN_FLEXCARD,
 	}, {
 	}
 };
@@ -108,7 +219,7 @@ MODULE_DEVICE_TABLE(of, c_can_of_table);
 static int c_can_plat_probe(struct platform_device *pdev)
 {
 	int ret;
-	void __iomem *addr;
+	void __iomem *addr, *reset_reg;
 	struct net_device *dev;
 	struct c_can_priv *priv;
 	const struct of_device_id *match;
@@ -167,6 +278,8 @@ static int c_can_plat_probe(struct platform_device *pdev)
 	}
 
 	priv = netdev_priv(dev);
+	priv->can.clock.freq = clk_get_rate(clk);
+
 	switch (id->driver_data) {
 	case BOSCH_C_CAN:
 		priv->regs = reg_map_c_can;
@@ -199,7 +312,26 @@ static int c_can_plat_probe(struct platform_device *pdev)
 			dev_info(&pdev->dev, "control memory is not used for raminit\n");
 		else
 			priv->raminit = c_can_hw_raminit;
+
 		break;
+	case BOSCH_D_CAN_FLEXCARD:
+		priv->regs = reg_map_d_can;
+		priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
+		priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
+		priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
+		priv->instance = pdev->id;
+
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		reset_reg = ioremap(res->start, resource_size(res));
+		if (!reset_reg || priv->instance < 0) {
+			dev_info(&pdev->dev, "Can't reset device.\n");
+		} else {
+			writel(1 << (4 + priv->instance), addr);
+			udelay(100);
+		}
+		iounmap(reset_reg);
+		priv->can.clock.freq = 16000000;
+
 	default:
 		ret = -EINVAL;
 		goto exit_free_device;
@@ -208,7 +340,6 @@ static int c_can_plat_probe(struct platform_device *pdev)
 	dev->irq = irq;
 	priv->base = addr;
 	priv->device = &pdev->dev;
-	priv->can.clock.freq = clk_get_rate(clk);
 	priv->priv = clk;
 	priv->type = id->driver_data;
 
@@ -222,10 +353,22 @@ static int c_can_plat_probe(struct platform_device *pdev)
 		goto exit_free_device;
 	}
 
+	if (id->driver_data == BOSCH_D_CAN_FLEXCARD) {
+		ret = fc_register_rx_pkt(FC_CANIF_OFFSET + pdev->id,
+				dev, c_can_rx_pkt);
+		if (ret) {
+			dev_err(&pdev->dev,
+					"registering RX-CB failed %d\n", ret);
+			goto exit_unregister_device;
+		}
+	}
+
 	dev_info(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
 		 KBUILD_MODNAME, priv->base, dev->irq);
 	return 0;
 
+exit_unregister_device:
+	unregister_c_can_dev(dev);
 exit_free_device:
 	free_c_can_dev(dev);
 exit_iounmap:
@@ -246,6 +389,8 @@ static int c_can_plat_remove(struct platform_device *pdev)
 	struct c_can_priv *priv = netdev_priv(dev);
 	struct resource *mem;
 
+	if (priv->type == BOSCH_D_CAN_FLEXCARD)
+		fc_unregister_rx_pkt(FC_CANIF_OFFSET + priv->instance);
 	unregister_c_can_dev(dev);
 
 	free_c_can_dev(dev);
-- 
1.8.4.rc3

Re: [PATCH 01/16] c_can_platform: add FlexCard D-CAN support

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 8463 bytes --]

On 09/09/2013 09:24 AM, Benedikt Spranger wrote:
> FlexCard supports up to 8 D-CAN devices with a shared DMA-capable receive
> function. Add support for FlexCard D-CAN.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>

What are the prerequisites for this series? This doesn't compile against
current net-next/master (e7d33bb lockref: add ability to mark lockrefs
"dead").

More Comments inline.
Marc

> ---
>  drivers/net/can/c_can/c_can.h          |   1 +
>  drivers/net/can/c_can/c_can_platform.c | 149 ++++++++++++++++++++++++++++++++-
>  2 files changed, 148 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
> index d2e1c21..d2e2d20 100644
> --- a/drivers/net/can/c_can/c_can.h
> +++ b/drivers/net/can/c_can/c_can.h
> @@ -148,6 +148,7 @@ enum c_can_dev_id {
>  	BOSCH_C_CAN_PLATFORM,
>  	BOSCH_C_CAN,
>  	BOSCH_D_CAN,
> +	BOSCH_D_CAN_FLEXCARD,
>  };
>  
>  /* c_can private data structure */
> diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
> index c6f838d..43a3e3f 100644
> --- a/drivers/net/can/c_can/c_can_platform.c
> +++ b/drivers/net/can/c_can/c_can_platform.c
> @@ -32,6 +32,7 @@
>  #include <linux/clk.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> +#include <linux/flexcard.h>
>  
>  #include <linux/can/dev.h>
>  
> @@ -81,6 +82,112 @@ static void c_can_hw_raminit(const struct c_can_priv *priv, bool enable)
>  	writel(val, priv->raminit_ctrlreg);
>  }
>  
> +static int c_can_rx_pkt(void *p, void *data, size_t len)
> +{

Why are the first two arguments a void *, why do we have len, that's
never used? Has the length already been checked, is it guaranteed >=
sizeof(struct fc_packet_buf)?

> +	struct net_device *dev = p;
> +	struct net_device_stats *stats = &dev->stats;
> +	struct fc_packet_buf *pb = data;
> +	union fc_packet_types *pt = &pb->packet;
> +	struct can_frame *frame;
> +	struct sk_buff *skb;
> +	u32 flags, id, state, type;
> +
> +	switch (le32_to_cpu(pb->header.type)) {
> +	case fc_packet_type_can:
> +		skb = alloc_can_skb(dev, &frame);
> +		if (!skb) {
> +			stats->rx_dropped++;
> +			return -ENOMEM;
> +		}
> +
> +		id = le32_to_cpu(pt->can_packet.id);
> +		flags = le32_to_cpu(pt->can_packet.flags);
> +
> +		if (id & BIT(29))
> +			frame->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
> +		else
> +			frame->can_id = id & CAN_SFF_MASK;
> +
> +		if (flags & BIT(13))
> +			frame->can_id |= CAN_RTR_FLAG;
> +		frame->can_dlc = (flags >> 8) & 0xf;

please use get_can_dlc((flags >> 8) & 0xf)

> +		memcpy(frame->data, pt->can_packet.data, frame->can_dlc);

Please don't copy data if you receive an RTR frame. What about the
endianess of the data?

> +		netif_receive_skb(skb);
> +
> +		stats->rx_packets++;
> +		stats->rx_bytes += frame->can_dlc;
> +		break;
> +
> +	case fc_packet_type_can_error:
> +		stats->rx_errors++;
> +
> +		skb = alloc_can_err_skb(dev, &frame);
> +		if (!skb)
> +			return -ENOMEM;
> +
> +		type = le32_to_cpu(pt->can_error_packet.type);
> +		state = le32_to_cpu(pt->can_error_packet.state);
> +
> +		switch (state) {
> +		case fc_can_state_warning:
> +			frame->data[1] |= CAN_ERR_CRTL_RX_WARNING;
> +			frame->data[1] |= CAN_ERR_CRTL_TX_WARNING;
> +			frame->can_id |= CAN_ERR_CRTL;
> +			break;
> +		case fc_can_state_error_passive:
> +			frame->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
> +			frame->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
> +			frame->can_id |= CAN_ERR_CRTL;
> +			break;
> +		case fc_can_state_bus_off:
> +			frame->can_id |= CAN_ERR_BUSOFF;
> +			break;
> +		}
> +
> +		switch (type) {
> +		case fc_can_error_stuff:
> +			frame->data[2] |= CAN_ERR_PROT_STUFF;
> +			frame->can_id |= CAN_ERR_PROT;
> +			break;
> +		case fc_can_error_form:
> +			frame->data[2] |= CAN_ERR_PROT_FORM;
> +			frame->can_id |= CAN_ERR_PROT;
> +			break;
> +		case fc_can_error_acknowledge:
> +			frame->can_id |= CAN_ERR_ACK;
> +			break;
> +		case fc_can_error_bit1:
> +			frame->data[2] |= CAN_ERR_PROT_BIT1;
> +			frame->can_id |= CAN_ERR_PROT;
> +			break;
> +		case fc_can_error_bit0:
> +			frame->data[2] |= CAN_ERR_PROT_BIT0;
> +			frame->can_id |= CAN_ERR_PROT;
> +			break;
> +		case fc_can_error_crc:
> +			frame->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
> +			frame->can_id |= CAN_ERR_PROT;
> +			break;
> +		case fc_can_error_parity:
> +			frame->data[1] |= CAN_ERR_PROT_UNSPEC;
> +			frame->can_id |= CAN_ERR_CRTL;
> +			break;
> +		}
> +		frame->data[5] = pt->can_error_packet.rx_error_counter;
> +		frame->data[6] = pt->can_error_packet.tx_error_counter;
> +
> +		stats->rx_bytes += frame->can_dlc;
> +		stats->rx_packets++;
> +
> +		netif_receive_skb(skb);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static struct platform_device_id c_can_id_table[] = {
>  	[BOSCH_C_CAN_PLATFORM] = {
>  		.name = KBUILD_MODNAME,
> @@ -93,6 +200,10 @@ static struct platform_device_id c_can_id_table[] = {
>  	[BOSCH_D_CAN] = {
>  		.name = "d_can",
>  		.driver_data = BOSCH_D_CAN,
> +	},
> +	[BOSCH_D_CAN_FLEXCARD] = {
> +		.name = "flexcard-d_can",
> +		.driver_data = BOSCH_D_CAN_FLEXCARD,
>  	}, {
>  	}
>  };
> @@ -108,7 +219,7 @@ MODULE_DEVICE_TABLE(of, c_can_of_table);
>  static int c_can_plat_probe(struct platform_device *pdev)
>  {
>  	int ret;
> -	void __iomem *addr;
> +	void __iomem *addr, *reset_reg;
>  	struct net_device *dev;
>  	struct c_can_priv *priv;
>  	const struct of_device_id *match;
> @@ -167,6 +278,8 @@ static int c_can_plat_probe(struct platform_device *pdev)
>  	}
>  
>  	priv = netdev_priv(dev);
> +	priv->can.clock.freq = clk_get_rate(clk);
> +
>  	switch (id->driver_data) {
>  	case BOSCH_C_CAN:
>  		priv->regs = reg_map_c_can;
> @@ -199,7 +312,26 @@ static int c_can_plat_probe(struct platform_device *pdev)
>  			dev_info(&pdev->dev, "control memory is not used for raminit\n");
>  		else
>  			priv->raminit = c_can_hw_raminit;
> +

Please remove

>  		break;
> +	case BOSCH_D_CAN_FLEXCARD:
> +		priv->regs = reg_map_d_can;
> +		priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
> +		priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
> +		priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
> +		priv->instance = pdev->id;
> +
> +		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +		reset_reg = ioremap(res->start, resource_size(res));
> +		if (!reset_reg || priv->instance < 0) {

priv->instance in unsinged

> +			dev_info(&pdev->dev, "Can't reset device.\n");
> +		} else {
> +			writel(1 << (4 + priv->instance), addr);
> +			udelay(100);
> +		}
> +		iounmap(reset_reg);
> +		priv->can.clock.freq = 16000000;
> +
>  	default:
>  		ret = -EINVAL;
>  		goto exit_free_device;
> @@ -208,7 +340,6 @@ static int c_can_plat_probe(struct platform_device *pdev)
>  	dev->irq = irq;
>  	priv->base = addr;
>  	priv->device = &pdev->dev;
> -	priv->can.clock.freq = clk_get_rate(clk);
>  	priv->priv = clk;
>  	priv->type = id->driver_data;
>  
> @@ -222,10 +353,22 @@ static int c_can_plat_probe(struct platform_device *pdev)
>  		goto exit_free_device;
>  	}
>  
> +	if (id->driver_data == BOSCH_D_CAN_FLEXCARD) {
> +		ret = fc_register_rx_pkt(FC_CANIF_OFFSET + pdev->id,
> +				dev, c_can_rx_pkt);
> +		if (ret) {
> +			dev_err(&pdev->dev,
> +					"registering RX-CB failed %d\n", ret);
> +			goto exit_unregister_device;
> +		}
> +	}
> +
>  	dev_info(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
>  		 KBUILD_MODNAME, priv->base, dev->irq);
>  	return 0;
>  
> +exit_unregister_device:
> +	unregister_c_can_dev(dev);
>  exit_free_device:
>  	free_c_can_dev(dev);
>  exit_iounmap:
> @@ -246,6 +389,8 @@ static int c_can_plat_remove(struct platform_device *pdev)
>  	struct c_can_priv *priv = netdev_priv(dev);
>  	struct resource *mem;
>  
> +	if (priv->type == BOSCH_D_CAN_FLEXCARD)
> +		fc_unregister_rx_pkt(FC_CANIF_OFFSET + priv->instance);
>  	unregister_c_can_dev(dev);
>  
>  	free_c_can_dev(dev);
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 02/16] c_can: add generic D-CAN RAM initialization support

[Benedikt Spranger]

D-CAN provides an automatic RAM initialization. The initialization can be
executed while D-CAN is in the init state.

It should be checked if this is compatible with TI's d_can implementation
which does not have or does not use this bit which is here according to the
d_can specification.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 38 ++++++++++++++++++++++++++++++++++++--
 drivers/net/can/c_can/c_can.h |  2 ++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index a668cd4..081620b 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -68,6 +68,8 @@
 #define TEST_SILENT		BIT(3)
 #define TEST_BASIC		BIT(2)
 
+#define FUNC_RAMINIT		BIT(3)
+
 /* status register */
 #define STATUS_PDA		BIT(10)
 #define STATUS_BOFF		BIT(7)
@@ -573,6 +575,7 @@ static int c_can_set_bittiming(struct net_device *dev)
 	u32 ten_bit_brp;
 	struct c_can_priv *priv = netdev_priv(dev);
 	const struct can_bittiming *bt = &priv->can.bittiming;
+	int retry;
 
 	/* c_can provides a 6-bit brp and 4-bit brpe fields */
 	ten_bit_brp = bt->brp - 1;
@@ -590,11 +593,42 @@ static int c_can_set_bittiming(struct net_device *dev)
 		"setting BTR=%04x BRPE=%04x\n", reg_btr, reg_brpe);
 
 	ctrl_save = priv->read_reg(priv, C_CAN_CTRL_REG);
-	priv->write_reg(priv, C_CAN_CTRL_REG,
-			ctrl_save | CONTROL_CCE | CONTROL_INIT);
+	ctrl_save &= ~CONTROL_INIT;
+
+	priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_CCE | CONTROL_INIT);
+	retry = 1000;
+	while (!(priv->read_reg(priv, C_CAN_CTRL_REG) & CONTROL_INIT)) {
+		if (!retry) {
+			netdev_info(dev, "CCTRL: set CONTROL_INIT failed\n");
+			return -EIO;
+		}
+		udelay(10);
+		retry--;
+	}
 	priv->write_reg(priv, C_CAN_BTR_REG, reg_btr);
 	priv->write_reg(priv, C_CAN_BRPEXT_REG, reg_brpe);
+
+	priv->write_reg(priv, C_CAN_FUNC_REG, FUNC_RAMINIT);
+	retry = 1000;
+	while (priv->read_reg(priv, C_CAN_FUNC_REG) & FUNC_RAMINIT) {
+		if (!retry) {
+			netdev_info(dev, "CFR: FUNC_RAMINIT failed\n");
+			return -EIO;
+		}
+		udelay(10);
+		retry--;
+	}
+
 	priv->write_reg(priv, C_CAN_CTRL_REG, ctrl_save);
+	retry = 1000;
+	while (priv->read_reg(priv, C_CAN_CTRL_REG) & CONTROL_INIT) {
+		if (!retry) {
+			netdev_info(dev, "CCTRL: clear CONTROL_INIT failed\n");
+			return -EIO;
+		}
+		udelay(10);
+		retry--;
+	}
 
 	return 0;
 }
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index d2e2d20..9f0eda8 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -61,6 +61,7 @@ enum reg {
 	C_CAN_INTPND2_REG,
 	C_CAN_MSGVAL1_REG,
 	C_CAN_MSGVAL2_REG,
+	C_CAN_FUNC_REG,
 };
 
 static const u16 reg_map_c_can[] = {
@@ -112,6 +113,7 @@ static const u16 reg_map_d_can[] = {
 	[C_CAN_BRPEXT_REG]	= 0x0E,
 	[C_CAN_INT_REG]		= 0x10,
 	[C_CAN_TEST_REG]	= 0x14,
+	[C_CAN_FUNC_REG]	= 0x18,
 	[C_CAN_TXRQST1_REG]	= 0x88,
 	[C_CAN_TXRQST2_REG]	= 0x8A,
 	[C_CAN_NEWDAT1_REG]	= 0x9C,
-- 
1.8.4.rc3

Re: [PATCH 02/16] c_can: add generic D-CAN RAM initialization support

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 3760 bytes --]

On 09/09/2013 09:24 AM, Benedikt Spranger wrote:
> D-CAN provides an automatic RAM initialization. The initialization can be
> executed while D-CAN is in the init state.
> 
> It should be checked if this is compatible with TI's d_can implementation
> which does not have or does not use this bit which is here according to the
> d_can specification.

Added AnilKumar Ch to the loop, who contributed the d_can support for
TI. Bene please collect a Tested-by for this patch.

Marc

> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 38 ++++++++++++++++++++++++++++++++++++--
>  drivers/net/can/c_can/c_can.h |  2 ++
>  2 files changed, 38 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index a668cd4..081620b 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -68,6 +68,8 @@
>  #define TEST_SILENT		BIT(3)
>  #define TEST_BASIC		BIT(2)
>  
> +#define FUNC_RAMINIT		BIT(3)
> +
>  /* status register */
>  #define STATUS_PDA		BIT(10)
>  #define STATUS_BOFF		BIT(7)
> @@ -573,6 +575,7 @@ static int c_can_set_bittiming(struct net_device *dev)
>  	u32 ten_bit_brp;
>  	struct c_can_priv *priv = netdev_priv(dev);
>  	const struct can_bittiming *bt = &priv->can.bittiming;
> +	int retry;
>  
>  	/* c_can provides a 6-bit brp and 4-bit brpe fields */
>  	ten_bit_brp = bt->brp - 1;
> @@ -590,11 +593,42 @@ static int c_can_set_bittiming(struct net_device *dev)
>  		"setting BTR=%04x BRPE=%04x\n", reg_btr, reg_brpe);
>  
>  	ctrl_save = priv->read_reg(priv, C_CAN_CTRL_REG);
> -	priv->write_reg(priv, C_CAN_CTRL_REG,
> -			ctrl_save | CONTROL_CCE | CONTROL_INIT);
> +	ctrl_save &= ~CONTROL_INIT;
> +
> +	priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_CCE | CONTROL_INIT);
> +	retry = 1000;
> +	while (!(priv->read_reg(priv, C_CAN_CTRL_REG) & CONTROL_INIT)) {
> +		if (!retry) {
> +			netdev_info(dev, "CCTRL: set CONTROL_INIT failed\n");
> +			return -EIO;
> +		}
> +		udelay(10);
> +		retry--;
> +	}
>  	priv->write_reg(priv, C_CAN_BTR_REG, reg_btr);
>  	priv->write_reg(priv, C_CAN_BRPEXT_REG, reg_brpe);
> +
> +	priv->write_reg(priv, C_CAN_FUNC_REG, FUNC_RAMINIT);
> +	retry = 1000;
> +	while (priv->read_reg(priv, C_CAN_FUNC_REG) & FUNC_RAMINIT) {
> +		if (!retry) {
> +			netdev_info(dev, "CFR: FUNC_RAMINIT failed\n");
> +			return -EIO;
> +		}
> +		udelay(10);
> +		retry--;
> +	}
> +
>  	priv->write_reg(priv, C_CAN_CTRL_REG, ctrl_save);
> +	retry = 1000;
> +	while (priv->read_reg(priv, C_CAN_CTRL_REG) & CONTROL_INIT) {
> +		if (!retry) {
> +			netdev_info(dev, "CCTRL: clear CONTROL_INIT failed\n");
> +			return -EIO;
> +		}
> +		udelay(10);
> +		retry--;
> +	}
>  
>  	return 0;
>  }
> diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
> index d2e2d20..9f0eda8 100644
> --- a/drivers/net/can/c_can/c_can.h
> +++ b/drivers/net/can/c_can/c_can.h
> @@ -61,6 +61,7 @@ enum reg {
>  	C_CAN_INTPND2_REG,
>  	C_CAN_MSGVAL1_REG,
>  	C_CAN_MSGVAL2_REG,
> +	C_CAN_FUNC_REG,
>  };
>  
>  static const u16 reg_map_c_can[] = {
> @@ -112,6 +113,7 @@ static const u16 reg_map_d_can[] = {
>  	[C_CAN_BRPEXT_REG]	= 0x0E,
>  	[C_CAN_INT_REG]		= 0x10,
>  	[C_CAN_TEST_REG]	= 0x14,
> +	[C_CAN_FUNC_REG]	= 0x18,
>  	[C_CAN_TXRQST1_REG]	= 0x88,
>  	[C_CAN_TXRQST2_REG]	= 0x8A,
>  	[C_CAN_NEWDAT1_REG]	= 0x9C,
> 


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 03/16] c_can: simplify arbitration register handling

[Benedikt Spranger]

The IF1/2 Arbitration register of the C_CAN/D_CAN ip core is internaly
a 32bit register. Do not use two different 16bit variables to handle
the IF1/2 Arbitration register.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 081620b..bdb7bcd 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -117,9 +117,9 @@
 				IF_COMM_DATAA | IF_COMM_DATAB)
 
 /* IFx arbitration */
-#define IF_ARB_MSGVAL		BIT(15)
-#define IF_ARB_MSGXTD		BIT(14)
-#define IF_ARB_TRANSMIT		BIT(13)
+#define IF_ARB_MSGVAL		BIT(31)
+#define IF_ARB_MSGXTD		BIT(30)
+#define IF_ARB_TRANSMIT		BIT(29)
 
 /* IFx message control */
 #define IF_MCONT_NEWDAT		BIT(15)
@@ -133,6 +133,7 @@
 #define IF_MCONT_TXRQST		BIT(8)
 #define IF_MCONT_EOB		BIT(7)
 #define IF_MCONT_DLC_MASK	0xf
+#define IF_MCONT_DLC_MAX	8
 
 /*
  * IFx register masks:
@@ -336,7 +337,7 @@ static void c_can_write_msg_object(struct net_device *dev,
 			int iface, struct can_frame *frame, int objno)
 {
 	int i;
-	u16 flags = 0;
+	u32 flags = IF_ARB_MSGVAL;
 	unsigned int id;
 	struct c_can_priv *priv = netdev_priv(dev);
 
@@ -349,11 +350,11 @@ static void c_can_write_msg_object(struct net_device *dev,
 	} else
 		id = ((frame->can_id & CAN_SFF_MASK) << 18);
 
-	flags |= IF_ARB_MSGVAL;
+	id |= flags;
 
 	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
 				IFX_WRITE_LOW_16BIT(id));
-	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface), flags |
+	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
 				IFX_WRITE_HIGH_16BIT(id));
 
 	for (i = 0; i < frame->can_dlc; i += 2) {
@@ -439,7 +440,7 @@ static void c_can_handle_lost_msg_obj(struct net_device *dev,
 
 static int c_can_read_msg_object(struct net_device *dev, int iface, int ctrl)
 {
-	u16 flags, data;
+	u16 data;
 	int i;
 	unsigned int val;
 	struct c_can_priv *priv = netdev_priv(dev);
@@ -455,16 +456,15 @@ static int c_can_read_msg_object(struct net_device *dev, int iface, int ctrl)
 
 	frame->can_dlc = get_can_dlc(ctrl & 0x0F);
 
-	flags =	priv->read_reg(priv, C_CAN_IFACE(ARB2_REG, iface));
-	val = priv->read_reg(priv, C_CAN_IFACE(ARB1_REG, iface)) |
-		(flags << 16);
+	val = (priv->read_reg(priv, C_CAN_IFACE(ARB2_REG, iface)) << 16);
+	val |= priv->read_reg(priv, C_CAN_IFACE(ARB1_REG, iface));
 
-	if (flags & IF_ARB_MSGXTD)
+	if (val & IF_ARB_MSGXTD)
 		frame->can_id = (val & CAN_EFF_MASK) | CAN_EFF_FLAG;
 	else
 		frame->can_id = (val >> 18) & CAN_SFF_MASK;
 
-	if (flags & IF_ARB_TRANSMIT)
+	if (val & IF_ARB_TRANSMIT)
 		frame->can_id |= CAN_RTR_FLAG;
 	else {
 		for (i = 0; i < frame->can_dlc; i += 2) {
@@ -500,10 +500,11 @@ static void c_can_setup_receive_object(struct net_device *dev, int iface,
 	priv->write_reg(priv, C_CAN_IFACE(MASK2_REG, iface),
 			IFX_WRITE_HIGH_16BIT(mask) | BIT(13));
 
+	id |= IF_ARB_MSGVAL;
 	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
 			IFX_WRITE_LOW_16BIT(id));
 	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
-			(IF_ARB_MSGVAL | IFX_WRITE_HIGH_16BIT(id)));
+			(IFX_WRITE_HIGH_16BIT(id)));
 
 	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), mcont);
 	c_can_object_put(dev, iface, objno, IF_COMM_ALL & ~IF_COMM_TXRQST);
-- 
1.8.4.rc3

Re: [PATCH 03/16] c_can: simplify arbitration register handling

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 4042 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> The IF1/2 Arbitration register of the C_CAN/D_CAN ip core is internaly
> a 32bit register. Do not use two different 16bit variables to handle
> the IF1/2 Arbitration register.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>

Looks good, nitpit inline.

Marc
> ---
>  drivers/net/can/c_can/c_can.c | 27 ++++++++++++++-------------
>  1 file changed, 14 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 081620b..bdb7bcd 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -117,9 +117,9 @@
>  				IF_COMM_DATAA | IF_COMM_DATAB)
>  
>  /* IFx arbitration */
> -#define IF_ARB_MSGVAL		BIT(15)
> -#define IF_ARB_MSGXTD		BIT(14)
> -#define IF_ARB_TRANSMIT		BIT(13)
> +#define IF_ARB_MSGVAL		BIT(31)
> +#define IF_ARB_MSGXTD		BIT(30)
> +#define IF_ARB_TRANSMIT		BIT(29)
>  
>  /* IFx message control */
>  #define IF_MCONT_NEWDAT		BIT(15)
> @@ -133,6 +133,7 @@
>  #define IF_MCONT_TXRQST		BIT(8)
>  #define IF_MCONT_EOB		BIT(7)
>  #define IF_MCONT_DLC_MASK	0xf
> +#define IF_MCONT_DLC_MAX	8

It's not used, is it?

>  
>  /*
>   * IFx register masks:
> @@ -336,7 +337,7 @@ static void c_can_write_msg_object(struct net_device *dev,
>  			int iface, struct can_frame *frame, int objno)
>  {
>  	int i;
> -	u16 flags = 0;
> +	u32 flags = IF_ARB_MSGVAL;
>  	unsigned int id;
>  	struct c_can_priv *priv = netdev_priv(dev);
>  
> @@ -349,11 +350,11 @@ static void c_can_write_msg_object(struct net_device *dev,
>  	} else
>  		id = ((frame->can_id & CAN_SFF_MASK) << 18);
>  
> -	flags |= IF_ARB_MSGVAL;
> +	id |= flags;
>  
>  	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
>  				IFX_WRITE_LOW_16BIT(id));
> -	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface), flags |
> +	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
>  				IFX_WRITE_HIGH_16BIT(id));
>  
>  	for (i = 0; i < frame->can_dlc; i += 2) {
> @@ -439,7 +440,7 @@ static void c_can_handle_lost_msg_obj(struct net_device *dev,
>  
>  static int c_can_read_msg_object(struct net_device *dev, int iface, int ctrl)
>  {
> -	u16 flags, data;
> +	u16 data;
>  	int i;
>  	unsigned int val;
>  	struct c_can_priv *priv = netdev_priv(dev);
> @@ -455,16 +456,15 @@ static int c_can_read_msg_object(struct net_device *dev, int iface, int ctrl)
>  
>  	frame->can_dlc = get_can_dlc(ctrl & 0x0F);
>  
> -	flags =	priv->read_reg(priv, C_CAN_IFACE(ARB2_REG, iface));
> -	val = priv->read_reg(priv, C_CAN_IFACE(ARB1_REG, iface)) |
> -		(flags << 16);
> +	val = (priv->read_reg(priv, C_CAN_IFACE(ARB2_REG, iface)) << 16);
> +	val |= priv->read_reg(priv, C_CAN_IFACE(ARB1_REG, iface));
>  
> -	if (flags & IF_ARB_MSGXTD)
> +	if (val & IF_ARB_MSGXTD)
>  		frame->can_id = (val & CAN_EFF_MASK) | CAN_EFF_FLAG;
>  	else
>  		frame->can_id = (val >> 18) & CAN_SFF_MASK;
>  
> -	if (flags & IF_ARB_TRANSMIT)
> +	if (val & IF_ARB_TRANSMIT)
>  		frame->can_id |= CAN_RTR_FLAG;
>  	else {
>  		for (i = 0; i < frame->can_dlc; i += 2) {
> @@ -500,10 +500,11 @@ static void c_can_setup_receive_object(struct net_device *dev, int iface,
>  	priv->write_reg(priv, C_CAN_IFACE(MASK2_REG, iface),
>  			IFX_WRITE_HIGH_16BIT(mask) | BIT(13));
>  
> +	id |= IF_ARB_MSGVAL;
>  	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
>  			IFX_WRITE_LOW_16BIT(id));
>  	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
> -			(IF_ARB_MSGVAL | IFX_WRITE_HIGH_16BIT(id)));
> +			(IFX_WRITE_HIGH_16BIT(id)));
>  
>  	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), mcont);
>  	c_can_object_put(dev, iface, objno, IF_COMM_ALL & ~IF_COMM_TXRQST);
> 


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 04/16] c_can: fix receive buffer configuration

[Benedikt Spranger]

The former implementation lacks some initialization of receive buffer.
First the maximal buffer length was 0. The Buffer direction was not set
and the mask register a reserverd flag was cleared.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index bdb7bcd..886163f 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -116,6 +116,11 @@
 				IF_COMM_CONTROL | IF_COMM_TXRQST | \
 				IF_COMM_DATAA | IF_COMM_DATAB)
 
+/* IFx mask */
+#define IF_MASK_MXTD		BIT(31)
+#define IF_MASK_MDIR		BIT(30)
+#define IF_MASK_RES		BIT(29)
+
 /* IFx arbitration */
 #define IF_ARB_MSGVAL		BIT(31)
 #define IF_ARB_MSGXTD		BIT(30)
@@ -653,11 +658,15 @@ static void c_can_configure_msg_objects(struct net_device *dev)
 
 	/* setup receive message objects */
 	for (i = C_CAN_MSG_OBJ_RX_FIRST; i < C_CAN_MSG_OBJ_RX_LAST; i++)
-		c_can_setup_receive_object(dev, 0, i, 0, 0,
-			(IF_MCONT_RXIE | IF_MCONT_UMASK) & ~IF_MCONT_EOB);
-
-	c_can_setup_receive_object(dev, 0, C_CAN_MSG_OBJ_RX_LAST, 0, 0,
-			IF_MCONT_EOB | IF_MCONT_RXIE | IF_MCONT_UMASK);
+		c_can_setup_receive_object(dev, 0, i,
+					   IF_MASK_MDIR | IF_MASK_RES, 0,
+					   IF_MCONT_UMASK | IF_MCONT_RXIE |
+					   IF_MCONT_DLC_MAX);
+
+	c_can_setup_receive_object(dev, 0, C_CAN_MSG_OBJ_RX_LAST,
+				   IF_MASK_MDIR | IF_MASK_RES, 0,
+				   IF_MCONT_UMASK | IF_MCONT_EOB |
+				   IF_MCONT_RXIE | IF_MCONT_DLC_MAX);
 }
 
 /*
-- 
1.8.4.rc3

Re: [PATCH 04/16] c_can: fix receive buffer configuration

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 2132 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> The former implementation lacks some initialization of receive buffer.
> First the maximal buffer length was 0. The Buffer direction was not set
> and the mask register a reserverd flag was cleared.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index bdb7bcd..886163f 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -116,6 +116,11 @@
>  				IF_COMM_CONTROL | IF_COMM_TXRQST | \
>  				IF_COMM_DATAA | IF_COMM_DATAB)
>  
> +/* IFx mask */
> +#define IF_MASK_MXTD		BIT(31)
> +#define IF_MASK_MDIR		BIT(30)
> +#define IF_MASK_RES		BIT(29)
> +
>  /* IFx arbitration */
>  #define IF_ARB_MSGVAL		BIT(31)
>  #define IF_ARB_MSGXTD		BIT(30)
> @@ -653,11 +658,15 @@ static void c_can_configure_msg_objects(struct net_device *dev)
>  
>  	/* setup receive message objects */
>  	for (i = C_CAN_MSG_OBJ_RX_FIRST; i < C_CAN_MSG_OBJ_RX_LAST; i++)
> -		c_can_setup_receive_object(dev, 0, i, 0, 0,
> -			(IF_MCONT_RXIE | IF_MCONT_UMASK) & ~IF_MCONT_EOB);
> -
> -	c_can_setup_receive_object(dev, 0, C_CAN_MSG_OBJ_RX_LAST, 0, 0,
> -			IF_MCONT_EOB | IF_MCONT_RXIE | IF_MCONT_UMASK);
> +		c_can_setup_receive_object(dev, 0, i,
> +					   IF_MASK_MDIR | IF_MASK_RES, 0,
> +					   IF_MCONT_UMASK | IF_MCONT_RXIE |
> +					   IF_MCONT_DLC_MAX);

DLC_MAX should be added in this patch. not in 3.

> +
> +	c_can_setup_receive_object(dev, 0, C_CAN_MSG_OBJ_RX_LAST,
> +				   IF_MASK_MDIR | IF_MASK_RES, 0,
> +				   IF_MCONT_UMASK | IF_MCONT_EOB |
> +				   IF_MCONT_RXIE | IF_MCONT_DLC_MAX);
>  }
>  
>  /*
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 05/16] c_can: use 32 bit access for D_CAN

[Benedikt Spranger]

Other than the C_CAN 16 bit memory interface the D_CAN uses a 32bit memory
interface. This causes some trouble while accessing the IFxCMR register in
two 16bit chunks. Use 32bit access on D_CAN.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 56 +++++++++++++++++++++++++++----------------
 1 file changed, 35 insertions(+), 21 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 886163f..b3cfb85 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -262,11 +262,32 @@ static inline int get_tx_echo_msg_obj(const struct c_can_priv *priv)
 
 static u32 c_can_read_reg32(struct c_can_priv *priv, enum reg index)
 {
-	u32 val = priv->read_reg(priv, index);
-	val |= ((u32) priv->read_reg(priv, index + 1)) << 16;
+	u32 val;
+
+	if (priv->type == BOSCH_D_CAN || priv->type == BOSCH_D_CAN_FLEXCARD) {
+		val = readl(priv->base + priv->regs[index]);
+	} else {
+		val = priv->read_reg(priv, index);
+		val |= ((u32) priv->read_reg(priv, index + 1)) << 16;
+	}
 	return val;
 }
 
+static void c_can_writereg32(struct c_can_priv *priv, enum reg index,
+		u16 high, u16 low)
+{
+	u32 val;
+
+	if (priv->type == BOSCH_D_CAN || priv->type == BOSCH_D_CAN_FLEXCARD) {
+		val = high << 16;
+		val |= low;
+		writel(val, priv->base + priv->regs[index]);
+	} else {
+		priv->write_reg(priv, index + 1, high);
+		priv->write_reg(priv, index, low);
+	}
+}
+
 static void c_can_enable_all_interrupts(struct c_can_priv *priv,
 						int enable)
 {
@@ -309,10 +330,8 @@ static inline void c_can_object_get(struct net_device *dev,
 	 * register and message RAM must be complete in 6 CAN-CLK
 	 * period.
 	 */
-	priv->write_reg(priv, C_CAN_IFACE(COMMSK_REG, iface),
-			IFX_WRITE_LOW_16BIT(mask));
-	priv->write_reg(priv, C_CAN_IFACE(COMREQ_REG, iface),
-			IFX_WRITE_LOW_16BIT(objno));
+	c_can_writereg32(priv, C_CAN_IFACE(COMREQ_REG, iface),
+			IFX_WRITE_LOW_16BIT(mask), IFX_WRITE_LOW_16BIT(objno));
 
 	if (c_can_msg_obj_is_busy(priv, iface))
 		netdev_err(dev, "timed out in object get\n");
@@ -329,9 +348,8 @@ static inline void c_can_object_put(struct net_device *dev,
 	 * register and message RAM must be complete in 6 CAN-CLK
 	 * period.
 	 */
-	priv->write_reg(priv, C_CAN_IFACE(COMMSK_REG, iface),
-			(IF_COMM_WR | IFX_WRITE_LOW_16BIT(mask)));
-	priv->write_reg(priv, C_CAN_IFACE(COMREQ_REG, iface),
+	c_can_writereg32(priv, C_CAN_IFACE(COMREQ_REG, iface),
+			IF_COMM_WR | IFX_WRITE_LOW_16BIT(mask),
 			IFX_WRITE_LOW_16BIT(objno));
 
 	if (c_can_msg_obj_is_busy(priv, iface))
@@ -496,23 +514,19 @@ static void c_can_setup_receive_object(struct net_device *dev, int iface,
 {
 	struct c_can_priv *priv = netdev_priv(dev);
 
-	priv->write_reg(priv, C_CAN_IFACE(MASK1_REG, iface),
-			IFX_WRITE_LOW_16BIT(mask));
-
 	/* According to C_CAN documentation, the reserved bit
 	 * in IFx_MASK2 register is fixed 1
 	 */
-	priv->write_reg(priv, C_CAN_IFACE(MASK2_REG, iface),
-			IFX_WRITE_HIGH_16BIT(mask) | BIT(13));
-
+	c_can_writereg32(priv, C_CAN_IFACE(MASK1_REG, iface),
+			IFX_WRITE_HIGH_16BIT(mask) | BIT(13),
+			IFX_WRITE_LOW_16BIT(mask));
 	id |= IF_ARB_MSGVAL;
-	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
-			IFX_WRITE_LOW_16BIT(id));
-	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
-			(IFX_WRITE_HIGH_16BIT(id)));
+	c_can_writereg32(priv, C_CAN_IFACE(ARB1_REG, iface),
+			IFX_WRITE_HIGH_16BIT(id), IFX_WRITE_LOW_16BIT(id));
+	c_can_writereg32(priv, C_CAN_IFACE(MSGCTRL_REG, iface), 0, mcont);
 
-	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), mcont);
-	c_can_object_put(dev, iface, objno, IF_COMM_ALL & ~IF_COMM_TXRQST);
+	c_can_object_put(dev, iface, objno, IF_COMM_WR | IF_COMM_MASK |
+			 IF_COMM_ARB | IF_COMM_CONTROL | IF_COMM_CLR_INT_PND);
 
 	netdev_dbg(dev, "obj no:%d, msgval:0x%08x\n", objno,
 			c_can_read_reg32(priv, C_CAN_MSGVAL1_REG));
-- 
1.8.4.rc3

Re: [PATCH 05/16] c_can: use 32 bit access for D_CAN

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 5047 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> Other than the C_CAN 16 bit memory interface the D_CAN uses a 32bit memory
> interface. This causes some trouble while accessing the IFxCMR register in
> two 16bit chunks. Use 32bit access on D_CAN.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 56 +++++++++++++++++++++++++++----------------
>  1 file changed, 35 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 886163f..b3cfb85 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -262,11 +262,32 @@ static inline int get_tx_echo_msg_obj(const struct c_can_priv *priv)
>  
>  static u32 c_can_read_reg32(struct c_can_priv *priv, enum reg index)

What about introducing priv->{read,write}_reg32 function pointers?

>  {
> -	u32 val = priv->read_reg(priv, index);
> -	val |= ((u32) priv->read_reg(priv, index + 1)) << 16;
> +	u32 val;
> +
> +	if (priv->type == BOSCH_D_CAN || priv->type == BOSCH_D_CAN_FLEXCARD) {
> +		val = readl(priv->base + priv->regs[index]);
> +	} else {
> +		val = priv->read_reg(priv, index);
> +		val |= ((u32) priv->read_reg(priv, index + 1)) << 16;
> +	}
>  	return val;
>  }
>  
> +static void c_can_writereg32(struct c_can_priv *priv, enum reg index,
> +		u16 high, u16 low)
> +{

If we decide not to introduce read/write 32 bit function pointers,
please rename your function to c_can_write_reg32() to match the pattern
of the read_reg32() function.

As you have converted some of the potential users of write_reg32() to
work with a single 32 bit value instead of two 16 bits, I think it's
better to call this function with a single 32 bite value.

> +	u32 val;
> +
> +	if (priv->type == BOSCH_D_CAN || priv->type == BOSCH_D_CAN_FLEXCARD) {
> +		val = high << 16;
> +		val |= low;
> +		writel(val, priv->base + priv->regs[index]);
> +	} else {
> +		priv->write_reg(priv, index + 1, high);
> +		priv->write_reg(priv, index, low);
> +	}
> +}
> +
>  static void c_can_enable_all_interrupts(struct c_can_priv *priv,
>  						int enable)
>  {
> @@ -309,10 +330,8 @@ static inline void c_can_object_get(struct net_device *dev,
>  	 * register and message RAM must be complete in 6 CAN-CLK
>  	 * period.
>  	 */
> -	priv->write_reg(priv, C_CAN_IFACE(COMMSK_REG, iface),
> -			IFX_WRITE_LOW_16BIT(mask));
> -	priv->write_reg(priv, C_CAN_IFACE(COMREQ_REG, iface),
> -			IFX_WRITE_LOW_16BIT(objno));
> +	c_can_writereg32(priv, C_CAN_IFACE(COMREQ_REG, iface),
> +			IFX_WRITE_LOW_16BIT(mask), IFX_WRITE_LOW_16BIT(objno));
>  
>  	if (c_can_msg_obj_is_busy(priv, iface))
>  		netdev_err(dev, "timed out in object get\n");
> @@ -329,9 +348,8 @@ static inline void c_can_object_put(struct net_device *dev,
>  	 * register and message RAM must be complete in 6 CAN-CLK
>  	 * period.
>  	 */
> -	priv->write_reg(priv, C_CAN_IFACE(COMMSK_REG, iface),
> -			(IF_COMM_WR | IFX_WRITE_LOW_16BIT(mask)));
> -	priv->write_reg(priv, C_CAN_IFACE(COMREQ_REG, iface),
> +	c_can_writereg32(priv, C_CAN_IFACE(COMREQ_REG, iface),
> +			IF_COMM_WR | IFX_WRITE_LOW_16BIT(mask),
>  			IFX_WRITE_LOW_16BIT(objno));
>  
>  	if (c_can_msg_obj_is_busy(priv, iface))
> @@ -496,23 +514,19 @@ static void c_can_setup_receive_object(struct net_device *dev, int iface,
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
>  
> -	priv->write_reg(priv, C_CAN_IFACE(MASK1_REG, iface),
> -			IFX_WRITE_LOW_16BIT(mask));
> -
>  	/* According to C_CAN documentation, the reserved bit
>  	 * in IFx_MASK2 register is fixed 1
>  	 */
> -	priv->write_reg(priv, C_CAN_IFACE(MASK2_REG, iface),
> -			IFX_WRITE_HIGH_16BIT(mask) | BIT(13));
> -
> +	c_can_writereg32(priv, C_CAN_IFACE(MASK1_REG, iface),
> +			IFX_WRITE_HIGH_16BIT(mask) | BIT(13),
> +			IFX_WRITE_LOW_16BIT(mask));
>  	id |= IF_ARB_MSGVAL;
> -	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
> -			IFX_WRITE_LOW_16BIT(id));
> -	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
> -			(IFX_WRITE_HIGH_16BIT(id)));
> +	c_can_writereg32(priv, C_CAN_IFACE(ARB1_REG, iface),
> +			IFX_WRITE_HIGH_16BIT(id), IFX_WRITE_LOW_16BIT(id));
> +	c_can_writereg32(priv, C_CAN_IFACE(MSGCTRL_REG, iface), 0, mcont);
>  
> -	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), mcont);
> -	c_can_object_put(dev, iface, objno, IF_COMM_ALL & ~IF_COMM_TXRQST);
> +	c_can_object_put(dev, iface, objno, IF_COMM_WR | IF_COMM_MASK |
> +			 IF_COMM_ARB | IF_COMM_CONTROL | IF_COMM_CLR_INT_PND);

I think the last change is unrelated.

>  
>  	netdev_dbg(dev, "obj no:%d, msgval:0x%08x\n", objno,
>  			c_can_read_reg32(priv, C_CAN_MSGVAL1_REG));
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 06/16] c_can: consider set bittiming may fail

[Benedikt Spranger]

While setting the bittiming the C_CAN/D_CAN may fail. Do not bring up the
CAN interface in this case.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index b3cfb85..3fa5347 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -689,9 +689,10 @@ static void c_can_configure_msg_objects(struct net_device *dev)
  * - set operating mode
  * - configure message objects
  */
-static void c_can_chip_config(struct net_device *dev)
+static int c_can_chip_config(struct net_device *dev)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
+	int ret;
 
 	/* enable automatic retransmission */
 	priv->write_reg(priv, C_CAN_CTRL_REG,
@@ -726,15 +727,20 @@ static void c_can_chip_config(struct net_device *dev)
 	priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
 
 	/* set bittiming params */
-	c_can_set_bittiming(dev);
+	ret = c_can_set_bittiming(dev);
+
+	return ret;
 }
 
-static void c_can_start(struct net_device *dev)
+static int c_can_start(struct net_device *dev)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
+	int ret;
 
 	/* basic c_can configuration */
-	c_can_chip_config(dev);
+	ret = c_can_chip_config(dev);
+	if (ret)
+		goto out;
 
 	priv->can.state = CAN_STATE_ERROR_ACTIVE;
 
@@ -743,6 +749,9 @@ static void c_can_start(struct net_device *dev)
 
 	/* enable status change, error and module interrupts */
 	c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+
+out:
+	return ret;
 }
 
 static void c_can_stop(struct net_device *dev)
@@ -758,9 +767,15 @@ static void c_can_stop(struct net_device *dev)
 
 static int c_can_set_mode(struct net_device *dev, enum can_mode mode)
 {
+	int ret;
+
 	switch (mode) {
 	case CAN_MODE_START:
-		c_can_start(dev);
+		ret = c_can_start(dev);
+		if (ret) {
+			c_can_stop(dev);
+			return ret;
+		}
 		netif_wake_queue(dev);
 		break;
 	default:
-- 
1.8.4.rc3

Re: [PATCH 06/16] c_can: consider set bittiming may fail

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 2682 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> While setting the bittiming the C_CAN/D_CAN may fail. Do not bring up the
> CAN interface in this case.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 25 ++++++++++++++++++++-----
>  1 file changed, 20 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index b3cfb85..3fa5347 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -689,9 +689,10 @@ static void c_can_configure_msg_objects(struct net_device *dev)
>   * - set operating mode
>   * - configure message objects
>   */
> -static void c_can_chip_config(struct net_device *dev)
> +static int c_can_chip_config(struct net_device *dev)
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
> +	int ret;
>  
>  	/* enable automatic retransmission */
>  	priv->write_reg(priv, C_CAN_CTRL_REG,
> @@ -726,15 +727,20 @@ static void c_can_chip_config(struct net_device *dev)
>  	priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
>  
>  	/* set bittiming params */
> -	c_can_set_bittiming(dev);
> +	ret = c_can_set_bittiming(dev);
> +
> +	return ret;

Maybe just:
	return c_can_set_bittiming(dev);
>  }
>  
> -static void c_can_start(struct net_device *dev)
> +static int c_can_start(struct net_device *dev)
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
> +	int ret;
>  
>  	/* basic c_can configuration */
> -	c_can_chip_config(dev);
> +	ret = c_can_chip_config(dev);
> +	if (ret)
> +		goto out;

No need for a goto here, IMHO.

>  
>  	priv->can.state = CAN_STATE_ERROR_ACTIVE;
>  
> @@ -743,6 +749,9 @@ static void c_can_start(struct net_device *dev)
>  
>  	/* enable status change, error and module interrupts */
>  	c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
> +
> +out:
> +	return ret;
>  }
>  
>  static void c_can_stop(struct net_device *dev)
> @@ -758,9 +767,15 @@ static void c_can_stop(struct net_device *dev)
>  
>  static int c_can_set_mode(struct net_device *dev, enum can_mode mode)
>  {
> +	int ret;
> +
>  	switch (mode) {
>  	case CAN_MODE_START:
> -		c_can_start(dev);
> +		ret = c_can_start(dev);
> +		if (ret) {
> +			c_can_stop(dev);
> +			return ret;
> +		}
>  		netif_wake_queue(dev);
>  		break;
>  	default:
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 07/16] c_can: reconfigre message objects after leaving init state

[Benedikt Spranger]

The D_CAN controler invalidates the message buffer objects while leaving init.
Reconfigure the message buffer objects after leaving init.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 3fa5347..39e2bb0 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -662,13 +662,15 @@ static int c_can_set_bittiming(struct net_device *dev)
  * See user guide document for further details on configuring message
  * objects.
  */
-static void c_can_configure_msg_objects(struct net_device *dev)
+static void c_can_configure_msg_objects(struct net_device *dev, int invalidate)
 {
 	int i;
 
-	/* first invalidate all message objects */
-	for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_NO_OF_OBJECTS; i++)
-		c_can_inval_msg_object(dev, 0, i);
+	if (invalidate) {
+		/* first invalidate all message objects */
+		for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_NO_OF_OBJECTS; i++)
+			c_can_inval_msg_object(dev, 0, i);
+	}
 
 	/* setup receive message objects */
 	for (i = C_CAN_MSG_OBJ_RX_FIRST; i < C_CAN_MSG_OBJ_RX_LAST; i++)
@@ -721,7 +723,7 @@ static int c_can_chip_config(struct net_device *dev)
 				CONTROL_EIE | CONTROL_SIE | CONTROL_IE);
 
 	/* configure message objects */
-	c_can_configure_msg_objects(dev);
+	c_can_configure_msg_objects(dev, 1);
 
 	/* set a `lec` value so that we can check for updates later */
 	priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
@@ -729,6 +731,9 @@ static int c_can_chip_config(struct net_device *dev)
 	/* set bittiming params */
 	ret = c_can_set_bittiming(dev);
 
+	/* reconfigure message objects */
+	c_can_configure_msg_objects(dev, 0);
+
 	return ret;
 }
 
-- 
1.8.4.rc3

[PATCH 08/16] c_can: Add FlexCard CAN TX fifo support

[Benedikt Spranger]

The FlexCard DCAN implementation contains a specialized TX fifo function.
Add the TX support for this function.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 77 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 65 insertions(+), 12 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 39e2bb0..4b94f2d 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -41,6 +41,7 @@
 #include <linux/can/error.h>
 #include <linux/can/led.h>
 
+#include <linux/flexcard.h>
 #include "c_can.h"
 
 /* Number of interface registers */
@@ -566,24 +567,60 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 	u32 msg_obj_no;
 	struct c_can_priv *priv = netdev_priv(dev);
 	struct can_frame *frame = (struct can_frame *)skb->data;
+	int tx_fifo;
 
 	if (can_dropped_invalid_skb(dev, skb))
 		return NETDEV_TX_OK;
 
-	msg_obj_no = get_tx_next_msg_obj(priv);
+	tx_fifo = frame->can_dlc & FC_TXFIFO_FLAG;
+	frame->can_dlc &= FC_TXFIFO_DLC_MASK;
 
-	/* prepare message object for transmission */
-	c_can_write_msg_object(dev, 0, frame, msg_obj_no);
-	can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
+	if (tx_fifo) {
+		u32 id, *data, ctrl;
 
-	/*
-	 * we have to stop the queue in case of a wrap around or
-	 * if the next TX message object is still in use
-	 */
-	priv->tx_next++;
-	if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv)) ||
-			(priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0)
-		netif_stop_queue(dev);
+		if (readl(priv->base + FC_TXFIFO_STAT) &
+				FC_TXFIFO_STAT_FULL) {
+			netif_stop_queue(dev);
+			return NETDEV_TX_BUSY;
+		}
+
+		if (frame->can_id & CAN_EFF_FLAG) {
+			id = frame->can_id & CAN_EFF_MASK;
+			id |= FC_TXFIFO_MSGID_EXT;
+		} else {
+			id = frame->can_id & CAN_SFF_MASK;
+			/* StdID is left alligned */
+			id <<= FC_TXFIFO_MSGID_STDID_SHIFT;
+		}
+
+		writel(id, priv->base + FC_TXFIFO_MSGID);
+		writel(frame->can_dlc, priv->base + FC_TXFIFO_MSGCTRL);
+
+		if (frame->can_dlc) {
+			data = (u32 *) frame->data;
+			writel(data[0], priv->base + FC_TXFIFO_MSGDA);
+			writel(data[1], priv->base + FC_TXFIFO_MSGDB);
+		}
+
+		ctrl = readl(priv->base + FC_TXFIFO_CTRL);
+		ctrl |= FC_TXFIFO_CTRL_REQ;
+		writel(ctrl, priv->base + FC_TXFIFO_CTRL);
+		kfree_skb(skb);
+	} else {
+		msg_obj_no = get_tx_next_msg_obj(priv);
+
+		/* prepare message object for transmission */
+		c_can_write_msg_object(dev, 0, frame, msg_obj_no);
+		priv->tx_next++;
+
+		can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
+		/* we have to stop the queue in case of a wrap around or
+		 * if the next TX message object is still in use
+		 */
+		if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv))
+			|| ((priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0))
+			netif_stop_queue(dev);
+	}
 
 	return NETDEV_TX_OK;
 }
@@ -683,6 +720,8 @@ static void c_can_configure_msg_objects(struct net_device *dev, int invalidate)
 				   IF_MASK_MDIR | IF_MASK_RES, 0,
 				   IF_MCONT_UMASK | IF_MCONT_EOB |
 				   IF_MCONT_RXIE | IF_MCONT_DLC_MAX);
+
+	c_can_inval_msg_object(dev, 0, FC_TXFIFO_MO);
 }
 
 /*
@@ -740,8 +779,13 @@ static int c_can_chip_config(struct net_device *dev)
 static int c_can_start(struct net_device *dev)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
+	u32 conf;
 	int ret;
 
+	conf = readl(priv->base + FC_TXFIFO_CONF);
+	conf |= FC_TXFIFO_CONF_EN;
+	writel(conf, priv->base + FC_TXFIFO_CONF);
+
 	/* basic c_can configuration */
 	ret = c_can_chip_config(dev);
 	if (ret)
@@ -762,6 +806,11 @@ out:
 static void c_can_stop(struct net_device *dev)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
+	u32 conf;
+
+	conf = readl(priv->base + FC_TXFIFO_CONF);
+	conf &= ~FC_TXFIFO_CONF_EN;
+	writel(conf, priv->base + FC_TXFIFO_CONF);
 
 	/* disable all interrupts */
 	c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
@@ -1350,6 +1399,8 @@ int register_c_can_dev(struct net_device *dev)
 	struct c_can_priv *priv = netdev_priv(dev);
 	int err;
 
+	writel(0, priv->base + FC_TXFIFO_CONF);
+
 	c_can_pm_runtime_enable(priv);
 
 	dev->flags |= IFF_ECHO;	/* we support local echo */
@@ -1369,6 +1420,8 @@ void unregister_c_can_dev(struct net_device *dev)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
 
+	writel(0, priv->base + FC_TXFIFO_CONF);
+
 	unregister_candev(dev);
 
 	c_can_pm_runtime_disable(priv);
-- 
1.8.4.rc3

Re: [PATCH 08/16] c_can: Add FlexCard CAN TX fifo support

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 5416 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> The FlexCard DCAN implementation contains a specialized TX fifo function.
> Add the TX support for this function.

This patch looks a bit fishy. Is this compatible with existing
c_can/d_can hardware. It looks like you "use" frame->dlc to transport
some information.

> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 77 ++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 65 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 39e2bb0..4b94f2d 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -41,6 +41,7 @@
>  #include <linux/can/error.h>
>  #include <linux/can/led.h>
>  
> +#include <linux/flexcard.h>
>  #include "c_can.h"
>  
>  /* Number of interface registers */
> @@ -566,24 +567,60 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  	u32 msg_obj_no;
>  	struct c_can_priv *priv = netdev_priv(dev);
>  	struct can_frame *frame = (struct can_frame *)skb->data;
> +	int tx_fifo;
>  
>  	if (can_dropped_invalid_skb(dev, skb))
>  		return NETDEV_TX_OK;
>  
> -	msg_obj_no = get_tx_next_msg_obj(priv);
> +	tx_fifo = frame->can_dlc & FC_TXFIFO_FLAG;

Can you describe what you have encoded into to frame->can_dlc?

> +	frame->can_dlc &= FC_TXFIFO_DLC_MASK;
>  
> -	/* prepare message object for transmission */
> -	c_can_write_msg_object(dev, 0, frame, msg_obj_no);
> -	can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
> +	if (tx_fifo) {
> +		u32 id, *data, ctrl;
>  
> -	/*
> -	 * we have to stop the queue in case of a wrap around or
> -	 * if the next TX message object is still in use
> -	 */
> -	priv->tx_next++;
> -	if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv)) ||
> -			(priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0)
> -		netif_stop_queue(dev);
> +		if (readl(priv->base + FC_TXFIFO_STAT) &
> +				FC_TXFIFO_STAT_FULL) {
> +			netif_stop_queue(dev);
> +			return NETDEV_TX_BUSY;
> +		}
> +
> +		if (frame->can_id & CAN_EFF_FLAG) {
> +			id = frame->can_id & CAN_EFF_MASK;
> +			id |= FC_TXFIFO_MSGID_EXT;
> +		} else {
> +			id = frame->can_id & CAN_SFF_MASK;
> +			/* StdID is left alligned */
> +			id <<= FC_TXFIFO_MSGID_STDID_SHIFT;
> +		}
> +
> +		writel(id, priv->base + FC_TXFIFO_MSGID);
> +		writel(frame->can_dlc, priv->base + FC_TXFIFO_MSGCTRL);
> +
> +		if (frame->can_dlc) {
> +			data = (u32 *) frame->data;
> +			writel(data[0], priv->base + FC_TXFIFO_MSGDA);
> +			writel(data[1], priv->base + FC_TXFIFO_MSGDB);
> +		}
> +
> +		ctrl = readl(priv->base + FC_TXFIFO_CTRL);
> +		ctrl |= FC_TXFIFO_CTRL_REQ;
> +		writel(ctrl, priv->base + FC_TXFIFO_CTRL);
> +		kfree_skb(skb);
> +	} else {
> +		msg_obj_no = get_tx_next_msg_obj(priv);
> +
> +		/* prepare message object for transmission */
> +		c_can_write_msg_object(dev, 0, frame, msg_obj_no);
> +		priv->tx_next++;
> +
> +		can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
> +		/* we have to stop the queue in case of a wrap around or
> +		 * if the next TX message object is still in use
> +		 */
> +		if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv))
> +			|| ((priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0))
> +			netif_stop_queue(dev);
> +	}
>  
>  	return NETDEV_TX_OK;
>  }
> @@ -683,6 +720,8 @@ static void c_can_configure_msg_objects(struct net_device *dev, int invalidate)
>  				   IF_MASK_MDIR | IF_MASK_RES, 0,
>  				   IF_MCONT_UMASK | IF_MCONT_EOB |
>  				   IF_MCONT_RXIE | IF_MCONT_DLC_MAX);
> +
> +	c_can_inval_msg_object(dev, 0, FC_TXFIFO_MO);
>  }
>  
>  /*
> @@ -740,8 +779,13 @@ static int c_can_chip_config(struct net_device *dev)
>  static int c_can_start(struct net_device *dev)
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
> +	u32 conf;
>  	int ret;
>  
> +	conf = readl(priv->base + FC_TXFIFO_CONF);
> +	conf |= FC_TXFIFO_CONF_EN;
> +	writel(conf, priv->base + FC_TXFIFO_CONF);
> +
>  	/* basic c_can configuration */
>  	ret = c_can_chip_config(dev);
>  	if (ret)
> @@ -762,6 +806,11 @@ out:
>  static void c_can_stop(struct net_device *dev)
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
> +	u32 conf;
> +
> +	conf = readl(priv->base + FC_TXFIFO_CONF);
> +	conf &= ~FC_TXFIFO_CONF_EN;
> +	writel(conf, priv->base + FC_TXFIFO_CONF);
>  
>  	/* disable all interrupts */
>  	c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
> @@ -1350,6 +1399,8 @@ int register_c_can_dev(struct net_device *dev)
>  	struct c_can_priv *priv = netdev_priv(dev);
>  	int err;
>  
> +	writel(0, priv->base + FC_TXFIFO_CONF);
> +
>  	c_can_pm_runtime_enable(priv);
>  
>  	dev->flags |= IFF_ECHO;	/* we support local echo */
> @@ -1369,6 +1420,8 @@ void unregister_c_can_dev(struct net_device *dev)
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
>  
> +	writel(0, priv->base + FC_TXFIFO_CONF);
> +
>  	unregister_candev(dev);
>  
>  	c_can_pm_runtime_disable(priv);
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 09/16] c_can: expicit 32bit access on D_CAN to message buffer data register

[Benedikt Spranger]

change the 16bit access of ARB1_REG and DATA1/2_REG to a 32bit access.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 4b94f2d..c573399 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -360,7 +360,6 @@ static inline void c_can_object_put(struct net_device *dev,
 static void c_can_write_msg_object(struct net_device *dev,
 			int iface, struct can_frame *frame, int objno)
 {
-	int i;
 	u32 flags = IF_ARB_MSGVAL;
 	unsigned int id;
 	struct c_can_priv *priv = netdev_priv(dev);
@@ -376,15 +375,17 @@ static void c_can_write_msg_object(struct net_device *dev,
 
 	id |= flags;
 
-	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
-				IFX_WRITE_LOW_16BIT(id));
-	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
-				IFX_WRITE_HIGH_16BIT(id));
+	c_can_writereg32(priv, C_CAN_IFACE(ARB1_REG, iface),
+			IFX_WRITE_HIGH_16BIT(id),
+			IFX_WRITE_LOW_16BIT(id));
+
+	c_can_writereg32(priv, C_CAN_IFACE(DATA1_REG, iface),
+			 frame->data[2] | frame->data[3] << 8,
+			 frame->data[0] | frame->data[1] << 8);
 
-	for (i = 0; i < frame->can_dlc; i += 2) {
-		priv->write_reg(priv, C_CAN_IFACE(DATA1_REG, iface) + i / 2,
-				frame->data[i] | (frame->data[i + 1] << 8));
-	}
+	c_can_writereg32(priv, C_CAN_IFACE(DATA3_REG, iface),
+			 frame->data[6] | frame->data[7] << 8,
+			 frame->data[4] | frame->data[5] << 8);
 
 	/* enable interrupt for this message object */
 	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface),
-- 
1.8.4.rc3

Re: [PATCH 09/16] c_can: expicit 32bit access on D_CAN to message buffer data register

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 2170 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> change the 16bit access of ARB1_REG and DATA1/2_REG to a 32bit access.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 4b94f2d..c573399 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -360,7 +360,6 @@ static inline void c_can_object_put(struct net_device *dev,
>  static void c_can_write_msg_object(struct net_device *dev,
>  			int iface, struct can_frame *frame, int objno)
>  {
> -	int i;
>  	u32 flags = IF_ARB_MSGVAL;
>  	unsigned int id;
>  	struct c_can_priv *priv = netdev_priv(dev);
> @@ -376,15 +375,17 @@ static void c_can_write_msg_object(struct net_device *dev,
>  
>  	id |= flags;
>  
> -	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
> -				IFX_WRITE_LOW_16BIT(id));
> -	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
> -				IFX_WRITE_HIGH_16BIT(id));
> +	c_can_writereg32(priv, C_CAN_IFACE(ARB1_REG, iface),
> +			IFX_WRITE_HIGH_16BIT(id),
> +			IFX_WRITE_LOW_16BIT(id));
> +
> +	c_can_writereg32(priv, C_CAN_IFACE(DATA1_REG, iface),
> +			 frame->data[2] | frame->data[3] << 8,
> +			 frame->data[0] | frame->data[1] << 8);

You can use something like beXX_to_cpup((__be32 *)&cf->data[0]) here.

>  
> -	for (i = 0; i < frame->can_dlc; i += 2) {
> -		priv->write_reg(priv, C_CAN_IFACE(DATA1_REG, iface) + i / 2,
> -				frame->data[i] | (frame->data[i + 1] << 8));
> -	}
> +	c_can_writereg32(priv, C_CAN_IFACE(DATA3_REG, iface),
> +			 frame->data[6] | frame->data[7] << 8,
> +			 frame->data[4] | frame->data[5] << 8);

You write here the upper 32 bit unconditionally, the original code doesn't.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 10/16] c_can: add 16bit align 32bit access functions

[Benedikt Spranger]

The FlexCard only allows 32bit access to DCAN registers, otherwise the
register value can be wraped up. Add a new helper function to access
registers 16bit aligned but 32bit access.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c          |  1 +
 drivers/net/can/c_can/c_can.h          |  1 +
 drivers/net/can/c_can/c_can_platform.c | 38 ++++++++++++++++++++++++++++++++--
 3 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index c573399..46d741d 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -1305,6 +1305,7 @@ struct net_device *alloc_c_can_dev(void)
 	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
 					CAN_CTRLMODE_LISTENONLY |
 					CAN_CTRLMODE_BERR_REPORTING;
+	spin_lock_init(&priv->lock);
 
 	return dev;
 }
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 9f0eda8..beea437 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -175,6 +175,7 @@ struct c_can_priv {
 	u32 __iomem *raminit_ctrlreg;
 	unsigned int instance;
 	void (*raminit) (const struct c_can_priv *priv, bool enable);
+	spinlock_t lock;
 };
 
 struct net_device *alloc_c_can_dev(void);
diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 43a3e3f..c6c1eb4 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -58,6 +58,40 @@ static void c_can_plat_write_reg_aligned_to_16bit(struct c_can_priv *priv,
 	writew(val, priv->base + priv->regs[index]);
 }
 
+#define ALIGN_DOWN(p, a)	((typeof(p))round_down((unsigned long)(p), (a)))
+
+static u16 c_can_plat_read_16bit_align_32bit_access(struct c_can_priv *priv,
+						    enum reg index)
+{
+	void *addr = priv->base + priv->regs[index];
+	u32 reg;
+	reg = readl(ALIGN_DOWN(addr, 4));
+
+	return IS_ALIGNED((unsigned long)addr, 4) ?
+			reg & 0xffff :
+			reg >> 16;
+}
+
+static void c_can_plat_write_16bit_align_32bit_access(struct c_can_priv *priv,
+						      enum reg index, u16 val)
+{
+	unsigned long flags;
+	void *addr = priv->base + priv->regs[index];
+	u32 reg;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	reg = readl(ALIGN_DOWN(addr, 4));
+	if (IS_ALIGNED((unsigned long)addr, 4)) {
+		reg &= 0xffff0000;
+		reg |= val;
+	} else {
+		reg &= 0xffff;
+		reg |= val << 16;
+	}
+	writel(reg, ALIGN_DOWN(addr, 4));
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
 static u16 c_can_plat_read_reg_aligned_to_32bit(struct c_can_priv *priv,
 						enum reg index)
 {
@@ -317,8 +351,8 @@ static int c_can_plat_probe(struct platform_device *pdev)
 	case BOSCH_D_CAN_FLEXCARD:
 		priv->regs = reg_map_d_can;
 		priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
-		priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
-		priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
+		priv->read_reg = c_can_plat_read_16bit_align_32bit_access;
+		priv->write_reg = c_can_plat_write_16bit_align_32bit_access;
 		priv->instance = pdev->id;
 
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-- 
1.8.4.rc3

Re: [PATCH 10/16] c_can: add 16bit align 32bit access functions

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 3941 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> The FlexCard only allows 32bit access to DCAN registers, otherwise the
> register value can be wraped up. Add a new helper function to access
> registers 16bit aligned but 32bit access.

You are modifying code you have previously added. You should shuffle
your patches that this is not necessary.

> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c          |  1 +
>  drivers/net/can/c_can/c_can.h          |  1 +
>  drivers/net/can/c_can/c_can_platform.c | 38 ++++++++++++++++++++++++++++++++--
>  3 files changed, 38 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index c573399..46d741d 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -1305,6 +1305,7 @@ struct net_device *alloc_c_can_dev(void)
>  	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
>  					CAN_CTRLMODE_LISTENONLY |
>  					CAN_CTRLMODE_BERR_REPORTING;
> +	spin_lock_init(&priv->lock);
>  
>  	return dev;
>  }
> diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
> index 9f0eda8..beea437 100644
> --- a/drivers/net/can/c_can/c_can.h
> +++ b/drivers/net/can/c_can/c_can.h
> @@ -175,6 +175,7 @@ struct c_can_priv {
>  	u32 __iomem *raminit_ctrlreg;
>  	unsigned int instance;
>  	void (*raminit) (const struct c_can_priv *priv, bool enable);
> +	spinlock_t lock;
>  };
>  
>  struct net_device *alloc_c_can_dev(void);
> diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
> index 43a3e3f..c6c1eb4 100644
> --- a/drivers/net/can/c_can/c_can_platform.c
> +++ b/drivers/net/can/c_can/c_can_platform.c
> @@ -58,6 +58,40 @@ static void c_can_plat_write_reg_aligned_to_16bit(struct c_can_priv *priv,
>  	writew(val, priv->base + priv->regs[index]);
>  }
>  
> +#define ALIGN_DOWN(p, a)	((typeof(p))round_down((unsigned long)(p), (a)))
> +
> +static u16 c_can_plat_read_16bit_align_32bit_access(struct c_can_priv *priv,
> +						    enum reg index)
> +{
> +	void *addr = priv->base + priv->regs[index];

Please compile with C=2. Should be void __iomem *.

> +	u32 reg;
> +	reg = readl(ALIGN_DOWN(addr, 4));
> +
> +	return IS_ALIGNED((unsigned long)addr, 4) ?
> +			reg & 0xffff :
> +			reg >> 16;
> +}
> +
> +static void c_can_plat_write_16bit_align_32bit_access(struct c_can_priv *priv,
> +						      enum reg index, u16 val)
> +{
> +	unsigned long flags;
> +	void *addr = priv->base + priv->regs[index];

dito

> +	u32 reg;
> +
> +	spin_lock_irqsave(&priv->lock, flags);
> +	reg = readl(ALIGN_DOWN(addr, 4));
> +	if (IS_ALIGNED((unsigned long)addr, 4)) {
> +		reg &= 0xffff0000;
> +		reg |= val;
> +	} else {
> +		reg &= 0xffff;
> +		reg |= val << 16;
> +	}
> +	writel(reg, ALIGN_DOWN(addr, 4));
> +	spin_unlock_irqrestore(&priv->lock, flags);
> +}
> +
>  static u16 c_can_plat_read_reg_aligned_to_32bit(struct c_can_priv *priv,
>  						enum reg index)
>  {
> @@ -317,8 +351,8 @@ static int c_can_plat_probe(struct platform_device *pdev)
>  	case BOSCH_D_CAN_FLEXCARD:
>  		priv->regs = reg_map_d_can;
>  		priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
> -		priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
> -		priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
> +		priv->read_reg = c_can_plat_read_16bit_align_32bit_access;
> +		priv->write_reg = c_can_plat_write_16bit_align_32bit_access;
>  		priv->instance = pdev->id;
>  
>  		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 11/16] c_can: stop netqueue if hardware is busy

[Benedikt Spranger]

Unlike other network devices the FlexCard do not support interrupts on TX.
Emulate the TX interrupt by polling the MOTRX registers and restart the
netqueue if one or more message object is available for transtition of CAN
frames.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 61 ++++++++++++++++++++++++++++++++++++++++---
 drivers/net/can/c_can/c_can.h |  4 +++
 2 files changed, 62 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 46d741d..02f7c89 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -550,18 +550,66 @@ static void c_can_inval_msg_object(struct net_device *dev, int iface, int objno)
 
 static inline int c_can_is_next_tx_obj_busy(struct c_can_priv *priv, int objno)
 {
-	int val = c_can_read_reg32(priv, C_CAN_TXRQST1_REG);
+	int val = c_can_read_reg32(priv, C_CAN_TXRQST1_REG + (objno / 32) * 4);
 
 	/*
 	 * as transmission request register's bit n-1 corresponds to
 	 * message object n, we need to handle the same properly.
 	 */
-	if (val & (1 << (objno - 1)))
+	if (val & (1 << ((objno % 32) - 1)))
 		return 1;
 
 	return 0;
 }
 
+static void c_can_motrx_add_timer(struct net_device *dev)
+{
+	struct c_can_priv *priv = netdev_priv(dev);
+
+	priv->timer.expires = round_jiffies_relative(1);
+	add_timer(&priv->timer);
+}
+
+static void c_can_motrx_poll(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct c_can_priv *priv = netdev_priv(dev);
+	u32 val, empty = 0;
+	int i;
+
+	for (i = 0; i < C_CAN_MOTRX_NR; i++) {
+		val = c_can_read_reg32(priv, C_CAN_TXRQST1_REG + i * 4);
+
+		if (val < priv->motrx[i]) {
+			netif_wake_queue(dev);
+			return;
+		}
+
+		empty |= val;
+	}
+
+	if (!empty) {
+		netif_wake_queue(dev);
+		return;
+	}
+
+	c_can_motrx_add_timer(dev);
+}
+
+static void c_can_motrx_monitor(struct net_device *dev)
+{
+	struct c_can_priv *priv = netdev_priv(dev);
+	int i;
+
+	if (priv->type != BOSCH_D_CAN_FLEXCARD)
+		return;
+
+	for (i = 0; i < C_CAN_MOTRX_NR; i++)
+		priv->motrx[i] = c_can_read_reg32(priv,
+				C_CAN_TXRQST1_REG + i * 4);
+	c_can_motrx_add_timer(dev);
+}
+
 static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 					struct net_device *dev)
 {
@@ -582,6 +630,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 		if (readl(priv->base + FC_TXFIFO_STAT) &
 				FC_TXFIFO_STAT_FULL) {
 			netif_stop_queue(dev);
+			c_can_motrx_monitor(dev);
 			return NETDEV_TX_BUSY;
 		}
 
@@ -619,8 +668,10 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 		 * if the next TX message object is still in use
 		 */
 		if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv))
-			|| ((priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0))
+			|| ((priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0)) {
 			netif_stop_queue(dev);
+			c_can_motrx_monitor(dev);
+		}
 	}
 
 	return NETDEV_TX_OK;
@@ -1272,6 +1323,7 @@ static int c_can_close(struct net_device *dev)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
 
+	del_timer_sync(&priv->timer);
 	netif_stop_queue(dev);
 	napi_disable(&priv->napi);
 	c_can_stop(dev);
@@ -1306,6 +1358,9 @@ struct net_device *alloc_c_can_dev(void)
 					CAN_CTRLMODE_LISTENONLY |
 					CAN_CTRLMODE_BERR_REPORTING;
 	spin_lock_init(&priv->lock);
+	priv->timer.function = c_can_motrx_poll;
+	priv->timer.data = (unsigned long) dev;
+	init_timer_deferrable(&priv->timer);
 
 	return dev;
 }
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index beea437..6d0f805 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -153,6 +153,8 @@ enum c_can_dev_id {
 	BOSCH_D_CAN_FLEXCARD,
 };
 
+#define C_CAN_MOTRX_NR	1
+
 /* c_can private data structure */
 struct c_can_priv {
 	struct can_priv can;	/* must be the first member */
@@ -176,6 +178,8 @@ struct c_can_priv {
 	unsigned int instance;
 	void (*raminit) (const struct c_can_priv *priv, bool enable);
 	spinlock_t lock;
+	struct timer_list timer;
+	u32 motrx[C_CAN_MOTRX_NR];
 };
 
 struct net_device *alloc_c_can_dev(void);
-- 
1.8.4.rc3

Re: [PATCH 11/16] c_can: stop netqueue if hardware is busy

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 4985 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> Unlike other network devices the FlexCard do not support interrupts on TX.
> Emulate the TX interrupt by polling the MOTRX registers and restart the
> netqueue if one or more message object is available for transtition of CAN
> frames.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 61 ++++++++++++++++++++++++++++++++++++++++---
>  drivers/net/can/c_can/c_can.h |  4 +++
>  2 files changed, 62 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 46d741d..02f7c89 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -550,18 +550,66 @@ static void c_can_inval_msg_object(struct net_device *dev, int iface, int objno)
>  
>  static inline int c_can_is_next_tx_obj_busy(struct c_can_priv *priv, int objno)
>  {
> -	int val = c_can_read_reg32(priv, C_CAN_TXRQST1_REG);
> +	int val = c_can_read_reg32(priv, C_CAN_TXRQST1_REG + (objno / 32) * 4);
>  
>  	/*
>  	 * as transmission request register's bit n-1 corresponds to
>  	 * message object n, we need to handle the same properly.
>  	 */
> -	if (val & (1 << (objno - 1)))
> +	if (val & (1 << ((objno % 32) - 1)))
>  		return 1;
>  
>  	return 0;
>  }
>  
> +static void c_can_motrx_add_timer(struct net_device *dev)
> +{
> +	struct c_can_priv *priv = netdev_priv(dev);
> +
> +	priv->timer.expires = round_jiffies_relative(1);
> +	add_timer(&priv->timer);
> +}
> +
> +static void c_can_motrx_poll(unsigned long data)
> +{
> +	struct net_device *dev = (struct net_device *)data;
> +	struct c_can_priv *priv = netdev_priv(dev);
> +	u32 val, empty = 0;
> +	int i;
> +
> +	for (i = 0; i < C_CAN_MOTRX_NR; i++) {
> +		val = c_can_read_reg32(priv, C_CAN_TXRQST1_REG + i * 4);
> +
> +		if (val < priv->motrx[i]) {
> +			netif_wake_queue(dev);
> +			return;
> +		}
> +
> +		empty |= val;
> +	}
> +
> +	if (!empty) {
> +		netif_wake_queue(dev);
> +		return;
> +	}
> +
> +	c_can_motrx_add_timer(dev);
> +}
> +
> +static void c_can_motrx_monitor(struct net_device *dev)
> +{
> +	struct c_can_priv *priv = netdev_priv(dev);
> +	int i;
> +
> +	if (priv->type != BOSCH_D_CAN_FLEXCARD)
> +		return;
> +
> +	for (i = 0; i < C_CAN_MOTRX_NR; i++)
> +		priv->motrx[i] = c_can_read_reg32(priv,
> +				C_CAN_TXRQST1_REG + i * 4);
> +	c_can_motrx_add_timer(dev);
> +}
> +
>  static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  					struct net_device *dev)
>  {
> @@ -582,6 +630,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  		if (readl(priv->base + FC_TXFIFO_STAT) &
>  				FC_TXFIFO_STAT_FULL) {
>  			netif_stop_queue(dev);
> +			c_can_motrx_monitor(dev);
>  			return NETDEV_TX_BUSY;
>  		}
>  
> @@ -619,8 +668,10 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  		 * if the next TX message object is still in use
>  		 */
>  		if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv))
> -			|| ((priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0))
> +			|| ((priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0)) {
>  			netif_stop_queue(dev);
> +			c_can_motrx_monitor(dev);
> +		}
>  	}
>  
>  	return NETDEV_TX_OK;
> @@ -1272,6 +1323,7 @@ static int c_can_close(struct net_device *dev)
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
>  
> +	del_timer_sync(&priv->timer);
>  	netif_stop_queue(dev);
>  	napi_disable(&priv->napi);
>  	c_can_stop(dev);
> @@ -1306,6 +1358,9 @@ struct net_device *alloc_c_can_dev(void)
>  					CAN_CTRLMODE_LISTENONLY |
>  					CAN_CTRLMODE_BERR_REPORTING;
>  	spin_lock_init(&priv->lock);
> +	priv->timer.function = c_can_motrx_poll;
> +	priv->timer.data = (unsigned long) dev;
> +	init_timer_deferrable(&priv->timer);
>  
>  	return dev;
>  }
> diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
> index beea437..6d0f805 100644
> --- a/drivers/net/can/c_can/c_can.h
> +++ b/drivers/net/can/c_can/c_can.h
> @@ -153,6 +153,8 @@ enum c_can_dev_id {
>  	BOSCH_D_CAN_FLEXCARD,
>  };
>  
> +#define C_CAN_MOTRX_NR	1

Are there reasons to have C_CAN_MOTRX_NR != 1? If not, please remove the
array and make code more clean.

>  /* c_can private data structure */
>  struct c_can_priv {
>  	struct can_priv can;	/* must be the first member */
> @@ -176,6 +178,8 @@ struct c_can_priv {
>  	unsigned int instance;
>  	void (*raminit) (const struct c_can_priv *priv, bool enable);
>  	spinlock_t lock;
> +	struct timer_list timer;
> +	u32 motrx[C_CAN_MOTRX_NR];
>  };
>  
>  struct net_device *alloc_c_can_dev(void);
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

Re: [PATCH 11/16] c_can: stop netqueue if hardware is busy

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 796 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> Unlike other network devices the FlexCard do not support interrupts on TX.
> Emulate the TX interrupt by polling the MOTRX registers and restart the
> netqueue if one or more message object is available for transtition of CAN
> frames.
> 
> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>

It's not onlynetif_wake_queue() that you have to call on TX-complete.
Have a look at c_can_do_tx(), better call it, or trigger napi from your
timer.

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 12/16] c_can: Add flag to disable automatic retransmission of CAN frames

[Benedikt Spranger]

The C_CAN/D_CAN controler can automatic retransmit CAN after arbitration loss.
Add a flag to CAN ctrlmode set the appropiate behaivior of this feature.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c    | 16 +++++++++-------
 include/uapi/linux/can/netlink.h |  2 ++
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 02f7c89..51ca2a6 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -785,33 +785,35 @@ static void c_can_configure_msg_objects(struct net_device *dev, int invalidate)
 static int c_can_chip_config(struct net_device *dev)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
+	u16 reg;
 	int ret;
 
-	/* enable automatic retransmission */
-	priv->write_reg(priv, C_CAN_CTRL_REG,
-			CONTROL_ENABLE_AR);
+	if (priv->can.ctrlmode & CAN_CTRLMODE_DAR)
+		reg = CONTROL_DISABLE_AR;
+	else
+		reg = CONTROL_ENABLE_AR;
 
 	if ((priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) &&
 	    (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)) {
 		/* loopback + silent mode : useful for hot self-test */
 		priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_EIE |
-				CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
+				reg | CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
 		priv->write_reg(priv, C_CAN_TEST_REG,
 				TEST_LBACK | TEST_SILENT);
 	} else if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
 		/* loopback mode : useful for self-test function */
 		priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_EIE |
-				CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
+				reg | CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
 		priv->write_reg(priv, C_CAN_TEST_REG, TEST_LBACK);
 	} else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
 		/* silent mode : bus-monitoring mode */
 		priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_EIE |
-				CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
+				reg | CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
 		priv->write_reg(priv, C_CAN_TEST_REG, TEST_SILENT);
 	} else
 		/* normal mode*/
 		priv->write_reg(priv, C_CAN_CTRL_REG,
-				CONTROL_EIE | CONTROL_SIE | CONTROL_IE);
+				reg | CONTROL_EIE | CONTROL_SIE | CONTROL_IE);
 
 	/* configure message objects */
 	c_can_configure_msg_objects(dev, 1);
diff --git a/include/uapi/linux/can/netlink.h b/include/uapi/linux/can/netlink.h
index 14966dd..fdce5af 100644
--- a/include/uapi/linux/can/netlink.h
+++ b/include/uapi/linux/can/netlink.h
@@ -88,6 +88,8 @@ struct can_ctrlmode {
 #define CAN_CTRLMODE_3_SAMPLES		0x04	/* Triple sampling mode */
 #define CAN_CTRLMODE_ONE_SHOT		0x08	/* One-Shot mode */
 #define CAN_CTRLMODE_BERR_REPORTING	0x10	/* Bus-error reporting */
+#define CAN_CTRLMODE_DAR		0x20	/* Disable Automatic
+						 * Retransmission */
 
 /*
  * CAN device statistics
-- 
1.8.4.rc3

Re: [PATCH 12/16] c_can: Add flag to disable automatic retransmission of CAN frames

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 3408 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> The C_CAN/D_CAN controler can automatic retransmit CAN after arbitration loss.
> Add a flag to CAN ctrlmode set the appropiate behaivior of this feature.

We already have this flag, it's called CAN_CTRLMODE_ONE_SHOT.

Marc

> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c    | 16 +++++++++-------
>  include/uapi/linux/can/netlink.h |  2 ++
>  2 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 02f7c89..51ca2a6 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -785,33 +785,35 @@ static void c_can_configure_msg_objects(struct net_device *dev, int invalidate)
>  static int c_can_chip_config(struct net_device *dev)
>  {
>  	struct c_can_priv *priv = netdev_priv(dev);
> +	u16 reg;
>  	int ret;
>  
> -	/* enable automatic retransmission */
> -	priv->write_reg(priv, C_CAN_CTRL_REG,
> -			CONTROL_ENABLE_AR);
> +	if (priv->can.ctrlmode & CAN_CTRLMODE_DAR)
> +		reg = CONTROL_DISABLE_AR;
> +	else
> +		reg = CONTROL_ENABLE_AR;
>  
>  	if ((priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) &&
>  	    (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)) {
>  		/* loopback + silent mode : useful for hot self-test */
>  		priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_EIE |
> -				CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
> +				reg | CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
>  		priv->write_reg(priv, C_CAN_TEST_REG,
>  				TEST_LBACK | TEST_SILENT);
>  	} else if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
>  		/* loopback mode : useful for self-test function */
>  		priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_EIE |
> -				CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
> +				reg | CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
>  		priv->write_reg(priv, C_CAN_TEST_REG, TEST_LBACK);
>  	} else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
>  		/* silent mode : bus-monitoring mode */
>  		priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_EIE |
> -				CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
> +				reg | CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
>  		priv->write_reg(priv, C_CAN_TEST_REG, TEST_SILENT);
>  	} else
>  		/* normal mode*/
>  		priv->write_reg(priv, C_CAN_CTRL_REG,
> -				CONTROL_EIE | CONTROL_SIE | CONTROL_IE);
> +				reg | CONTROL_EIE | CONTROL_SIE | CONTROL_IE);
>  
>  	/* configure message objects */
>  	c_can_configure_msg_objects(dev, 1);
> diff --git a/include/uapi/linux/can/netlink.h b/include/uapi/linux/can/netlink.h
> index 14966dd..fdce5af 100644
> --- a/include/uapi/linux/can/netlink.h
> +++ b/include/uapi/linux/can/netlink.h
> @@ -88,6 +88,8 @@ struct can_ctrlmode {
>  #define CAN_CTRLMODE_3_SAMPLES		0x04	/* Triple sampling mode */
>  #define CAN_CTRLMODE_ONE_SHOT		0x08	/* One-Shot mode */
>  #define CAN_CTRLMODE_BERR_REPORTING	0x10	/* Bus-error reporting */
> +#define CAN_CTRLMODE_DAR		0x20	/* Disable Automatic
> +						 * Retransmission */
>  
>  /*
>   * CAN device statistics
> 


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

Re: [PATCH 12/16] c_can: Add flag to disable automatic retransmission of CAN frames

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 718 bytes --]

On 09/09/2013 12:21 PM, Marc Kleine-Budde wrote:
> On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
>> The C_CAN/D_CAN controler can automatic retransmit CAN after arbitration loss.
>> Add a flag to CAN ctrlmode set the appropiate behaivior of this feature.
> 
> We already have this flag, it's called CAN_CTRLMODE_ONE_SHOT.

BTW: Have a look at commit:

    ee6f098 can: c_can: disable one shot mode until driver is fixed

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 13/16] c_can: flexcard: add ioctl to reset FIFO message object

[Benedikt Spranger]

The FlexCard FIFO reset implementation did not reset the FIFO message object.
Since the FIFO configuration is done from userspace a function to reset the
FIFO message object is needed. Add an ioctl to reset the FIFO message object
from userspace.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 51ca2a6..670a6b1 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -1447,7 +1447,21 @@ void free_c_can_dev(struct net_device *dev)
 }
 EXPORT_SYMBOL_GPL(free_c_can_dev);
 
+static int c_can_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	switch (cmd) {
+	case SIOCDEVPRIVATE:
+		c_can_inval_msg_object(dev, 0, FC_TXFIFO_MO);
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return 0;
+}
+
 static const struct net_device_ops c_can_netdev_ops = {
+	.ndo_do_ioctl = c_can_ioctl,
 	.ndo_open = c_can_open,
 	.ndo_stop = c_can_close,
 	.ndo_start_xmit = c_can_start_xmit,
-- 
1.8.4.rc3

Re: [PATCH 13/16] c_can: flexcard: add ioctl to reset FIFO message object

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 1638 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> The FlexCard FIFO reset implementation did not reset the FIFO message object.
> Since the FIFO configuration is done from userspace a function to reset the
> FIFO message object is needed. Add an ioctl to reset the FIFO message object
> from userspace.

Can you elaborate this a bit.

> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
>
> ---
>  drivers/net/can/c_can/c_can.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 51ca2a6..670a6b1 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -1447,7 +1447,21 @@ void free_c_can_dev(struct net_device *dev)
>  }
>  EXPORT_SYMBOL_GPL(free_c_can_dev);
>  
> +static int c_can_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
> +{
> +	switch (cmd) {
> +	case SIOCDEVPRIVATE:
> +		c_can_inval_msg_object(dev, 0, FC_TXFIFO_MO);
> +		break;

What happens if you call this ioctl on non flexcard HW?

> +	default:
> +		return -ENOIOCTLCMD;
> +	}
> +
> +	return 0;
> +}
> +
>  static const struct net_device_ops c_can_netdev_ops = {
> +	.ndo_do_ioctl = c_can_ioctl,
>  	.ndo_open = c_can_open,
>  	.ndo_stop = c_can_close,
>  	.ndo_start_xmit = c_can_start_xmit,
> 

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
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[PATCH 14/16] flexcard: can: CAN local loopback using SKB pflags

[Benedikt Spranger]

Flexcard receives CAN local loopback in hardware. Include the direction
information from the raw CAN message (DMA) in the pflags of SKB and use it
later in the CAN raw layer.

Signed-off-by: Holger Dengler <dengler@linutronix.de>
---
 drivers/net/can/c_can/c_can_platform.c | 14 +++++++++++---
 include/uapi/linux/can/raw.h           | 20 ++++++++++++++++++++
 net/can/raw.c                          | 22 ++++++----------------
 3 files changed, 37 insertions(+), 19 deletions(-)

diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index c6c1eb4..d8b99b5 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -35,6 +35,7 @@
 #include <linux/flexcard.h>
 
 #include <linux/can/dev.h>
+#include <linux/can/raw.h>
 
 #include "c_can.h"
 
@@ -125,6 +126,7 @@ static int c_can_rx_pkt(void *p, void *data, size_t len)
 	struct can_frame *frame;
 	struct sk_buff *skb;
 	u32 flags, id, state, type;
+	unsigned int *pflags;
 
 	switch (le32_to_cpu(pb->header.type)) {
 	case fc_packet_type_can:
@@ -142,14 +144,20 @@ static int c_can_rx_pkt(void *p, void *data, size_t len)
 		else
 			frame->can_id = id & CAN_SFF_MASK;
 
+		if (flags & BIT(12)) {
+			pflags = can_raw_flags(skb);
+			*pflags |= CAN_RAW_TX_ECHO;
+		} else {
+			/* No accounting for local echo packages */
+			stats->rx_packets++;
+			stats->rx_bytes += frame->can_dlc;
+		}
+
 		if (flags & BIT(13))
 			frame->can_id |= CAN_RTR_FLAG;
 		frame->can_dlc = (flags >> 8) & 0xf;
 		memcpy(frame->data, pt->can_packet.data, frame->can_dlc);
 		netif_receive_skb(skb);
-
-		stats->rx_packets++;
-		stats->rx_bytes += frame->can_dlc;
 		break;
 
 	case fc_packet_type_can_error:
diff --git a/include/uapi/linux/can/raw.h b/include/uapi/linux/can/raw.h
index a814062..188738c 100644
--- a/include/uapi/linux/can/raw.h
+++ b/include/uapi/linux/can/raw.h
@@ -27,4 +27,24 @@ enum {
 	CAN_RAW_FD_FRAMES,	/* allow CAN FD frames (default:off) */
 };
 
+#ifdef __KERNEL__
+
+#define CAN_RAW_TX_ECHO	0x00000001	/* CAN hardware TX echo packet */
+
+/*
+ * Return pointer to store the extra msg flags for raw_recvmsg().
+ * We use the space of one unsigned int beyond the 'struct sockaddr_can'
+ * in skb->cb.
+ */
+static inline unsigned int *can_raw_flags(struct sk_buff *skb)
+{
+	BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) +
+					 sizeof(unsigned int)));
+
+	/* return pointer after struct sockaddr_can */
+	return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
+}
+
+#endif /* __KERNEL__ */
+
 #endif
diff --git a/net/can/raw.c b/net/can/raw.c
index 641e1c8..80498cf 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -90,20 +90,6 @@ struct raw_sock {
 	can_err_mask_t err_mask;
 };
 
-/*
- * Return pointer to store the extra msg flags for raw_recvmsg().
- * We use the space of one unsigned int beyond the 'struct sockaddr_can'
- * in skb->cb.
- */
-static inline unsigned int *raw_flags(struct sk_buff *skb)
-{
-	BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) +
-					 sizeof(unsigned int)));
-
-	/* return pointer after struct sockaddr_can */
-	return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
-}
-
 static inline struct raw_sock *raw_sk(const struct sock *sk)
 {
 	return (struct raw_sock *)sk;
@@ -117,6 +103,10 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
 	struct sk_buff *skb;
 	unsigned int *pflags;
 
+	pflags = can_raw_flags(oskb);
+	if (*pflags & CAN_RAW_TX_ECHO)
+		oskb->sk = sk;
+
 	/* check the received tx sock reference */
 	if (!ro->recv_own_msgs && oskb->sk == sk)
 		return;
@@ -148,7 +138,7 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
 	addr->can_ifindex = skb->dev->ifindex;
 
 	/* add CAN specific message flags for raw_recvmsg() */
-	pflags = raw_flags(skb);
+	pflags = can_raw_flags(skb);
 	*pflags = 0;
 	if (oskb->sk)
 		*pflags |= MSG_DONTROUTE;
@@ -780,7 +770,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
 	}
 
 	/* assign the flags that have been recorded in raw_rcv() */
-	msg->msg_flags |= *(raw_flags(skb));
+	msg->msg_flags |= *(can_raw_flags(skb));
 
 	skb_free_datagram(sk, skb);
 
-- 
1.8.4.rc3

[PATCH 15/16] flexcard: can: Configure CAN loopback packages (TXACK)

[Benedikt Spranger]

Signed-off-by: Holger Dengler <dengler@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 670a6b1..92c1444 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -358,11 +358,13 @@ static inline void c_can_object_put(struct net_device *dev,
 }
 
 static void c_can_write_msg_object(struct net_device *dev,
-			int iface, struct can_frame *frame, int objno)
+			int iface, struct can_frame *frame, int objno,
+			int txie_off)
 {
 	u32 flags = IF_ARB_MSGVAL;
 	unsigned int id;
 	struct c_can_priv *priv = netdev_priv(dev);
+	u32 int_en;
 
 	if (!(frame->can_id & CAN_RTR_FLAG))
 		flags |= IF_ARB_TRANSMIT;
@@ -388,9 +390,10 @@ static void c_can_write_msg_object(struct net_device *dev,
 			 frame->data[4] | frame->data[5] << 8);
 
 	/* enable interrupt for this message object */
-	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface),
-			IF_MCONT_TXIE | IF_MCONT_TXRQST | IF_MCONT_EOB |
-			frame->can_dlc);
+	int_en = frame->can_dlc;
+	if (!txie_off)
+		int_en |= IF_MCONT_TXIE | IF_MCONT_TXRQST | IF_MCONT_EOB;
+	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), int_en);
 	c_can_object_put(dev, iface, objno, IF_COMM_ALL);
 }
 
@@ -616,16 +619,17 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 	u32 msg_obj_no;
 	struct c_can_priv *priv = netdev_priv(dev);
 	struct can_frame *frame = (struct can_frame *)skb->data;
-	int tx_fifo;
+	int tx_fifo, txie_off;
 
 	if (can_dropped_invalid_skb(dev, skb))
 		return NETDEV_TX_OK;
 
 	tx_fifo = frame->can_dlc & FC_TXFIFO_FLAG;
+	txie_off = frame->can_dlc & FC_TXACKOFF_FLAG;
 	frame->can_dlc &= FC_TXFIFO_DLC_MASK;
 
 	if (tx_fifo) {
-		u32 id, *data, ctrl;
+		u32 id, *data, ctrl, conf;
 
 		if (readl(priv->base + FC_TXFIFO_STAT) &
 				FC_TXFIFO_STAT_FULL) {
@@ -652,6 +656,11 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 			writel(data[1], priv->base + FC_TXFIFO_MSGDB);
 		}
 
+		conf = readl(priv->base + FC_TXFIFO_CONF);
+		conf &= ~FC_TXFIFO_CONF_TXACK;
+		conf |= (txie_off ? 0 : FC_TXFIFO_CONF_TXACK);
+		writel(conf, priv->base + FC_TXFIFO_CONF);
+
 		ctrl = readl(priv->base + FC_TXFIFO_CTRL);
 		ctrl |= FC_TXFIFO_CTRL_REQ;
 		writel(ctrl, priv->base + FC_TXFIFO_CTRL);
@@ -660,7 +669,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 		msg_obj_no = get_tx_next_msg_obj(priv);
 
 		/* prepare message object for transmission */
-		c_can_write_msg_object(dev, 0, frame, msg_obj_no);
+		c_can_write_msg_object(dev, 0, frame, msg_obj_no, txie_off);
 		priv->tx_next++;
 
 		can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
-- 
1.8.4.rc3

Re: [PATCH 15/16] flexcard: can: Configure CAN loopback packages (TXACK)

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 3416 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> Signed-off-by: Holger Dengler <dengler@linutronix.de>

I'm missing your S-o-b and a patch description. I'm finding some
uncommon use of frame->can_dlc.

Marc

> ---
>  drivers/net/can/c_can/c_can.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 670a6b1..92c1444 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -358,11 +358,13 @@ static inline void c_can_object_put(struct net_device *dev,
>  }
>  
>  static void c_can_write_msg_object(struct net_device *dev,
> -			int iface, struct can_frame *frame, int objno)
> +			int iface, struct can_frame *frame, int objno,
> +			int txie_off)
>  {
>  	u32 flags = IF_ARB_MSGVAL;
>  	unsigned int id;
>  	struct c_can_priv *priv = netdev_priv(dev);
> +	u32 int_en;
>  
>  	if (!(frame->can_id & CAN_RTR_FLAG))
>  		flags |= IF_ARB_TRANSMIT;
> @@ -388,9 +390,10 @@ static void c_can_write_msg_object(struct net_device *dev,
>  			 frame->data[4] | frame->data[5] << 8);
>  
>  	/* enable interrupt for this message object */
> -	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface),
> -			IF_MCONT_TXIE | IF_MCONT_TXRQST | IF_MCONT_EOB |
> -			frame->can_dlc);
> +	int_en = frame->can_dlc;
> +	if (!txie_off)
> +		int_en |= IF_MCONT_TXIE | IF_MCONT_TXRQST | IF_MCONT_EOB;
> +	priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), int_en);
>  	c_can_object_put(dev, iface, objno, IF_COMM_ALL);
>  }
>  
> @@ -616,16 +619,17 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  	u32 msg_obj_no;
>  	struct c_can_priv *priv = netdev_priv(dev);
>  	struct can_frame *frame = (struct can_frame *)skb->data;
> -	int tx_fifo;
> +	int tx_fifo, txie_off;
>  
>  	if (can_dropped_invalid_skb(dev, skb))
>  		return NETDEV_TX_OK;
>  
>  	tx_fifo = frame->can_dlc & FC_TXFIFO_FLAG;
> +	txie_off = frame->can_dlc & FC_TXACKOFF_FLAG;
>  	frame->can_dlc &= FC_TXFIFO_DLC_MASK;
>  
>  	if (tx_fifo) {
> -		u32 id, *data, ctrl;
> +		u32 id, *data, ctrl, conf;
>  
>  		if (readl(priv->base + FC_TXFIFO_STAT) &
>  				FC_TXFIFO_STAT_FULL) {
> @@ -652,6 +656,11 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  			writel(data[1], priv->base + FC_TXFIFO_MSGDB);
>  		}
>  
> +		conf = readl(priv->base + FC_TXFIFO_CONF);
> +		conf &= ~FC_TXFIFO_CONF_TXACK;
> +		conf |= (txie_off ? 0 : FC_TXFIFO_CONF_TXACK);
> +		writel(conf, priv->base + FC_TXFIFO_CONF);
> +
>  		ctrl = readl(priv->base + FC_TXFIFO_CTRL);
>  		ctrl |= FC_TXFIFO_CTRL_REQ;
>  		writel(ctrl, priv->base + FC_TXFIFO_CTRL);
> @@ -660,7 +669,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  		msg_obj_no = get_tx_next_msg_obj(priv);
>  
>  		/* prepare message object for transmission */
> -		c_can_write_msg_object(dev, 0, frame, msg_obj_no);
> +		c_can_write_msg_object(dev, 0, frame, msg_obj_no, txie_off);
>  		priv->tx_next++;
>  
>  		can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
> 


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

[PATCH 16/16] c_can: fix TX packet accounting

[Benedikt Spranger]

Due to the integration of the FlexCard support the TX stats accounting got
lost. Readd the accounting.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
---
 drivers/net/can/c_can/c_can.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 92c1444..b409cf2 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -619,6 +619,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 	u32 msg_obj_no;
 	struct c_can_priv *priv = netdev_priv(dev);
 	struct can_frame *frame = (struct can_frame *)skb->data;
+	struct net_device_stats *stats = &dev->stats;
 	int tx_fifo, txie_off;
 
 	if (can_dropped_invalid_skb(dev, skb))
@@ -664,6 +665,9 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 		ctrl = readl(priv->base + FC_TXFIFO_CTRL);
 		ctrl |= FC_TXFIFO_CTRL_REQ;
 		writel(ctrl, priv->base + FC_TXFIFO_CTRL);
+
+		stats->tx_bytes += frame->can_dlc;
+		stats->tx_packets++;
 		kfree_skb(skb);
 	} else {
 		msg_obj_no = get_tx_next_msg_obj(priv);
@@ -672,6 +676,8 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 		c_can_write_msg_object(dev, 0, frame, msg_obj_no, txie_off);
 		priv->tx_next++;
 
+		stats->tx_bytes += frame->can_dlc;
+		stats->tx_packets++;
 		can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
 		/* we have to stop the queue in case of a wrap around or
 		 * if the next TX message object is still in use
-- 
1.8.4.rc3

Re: [PATCH 16/16] c_can: fix TX packet accounting

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 1980 bytes --]

On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> Due to the integration of the FlexCard support the TX stats accounting got
> lost. Readd the accounting.

Please squash into the appropriate patch.

Marc

> Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
> ---
>  drivers/net/can/c_can/c_can.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 92c1444..b409cf2 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -619,6 +619,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  	u32 msg_obj_no;
>  	struct c_can_priv *priv = netdev_priv(dev);
>  	struct can_frame *frame = (struct can_frame *)skb->data;
> +	struct net_device_stats *stats = &dev->stats;
>  	int tx_fifo, txie_off;
>  
>  	if (can_dropped_invalid_skb(dev, skb))
> @@ -664,6 +665,9 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  		ctrl = readl(priv->base + FC_TXFIFO_CTRL);
>  		ctrl |= FC_TXFIFO_CTRL_REQ;
>  		writel(ctrl, priv->base + FC_TXFIFO_CTRL);
> +
> +		stats->tx_bytes += frame->can_dlc;
> +		stats->tx_packets++;
>  		kfree_skb(skb);
>  	} else {
>  		msg_obj_no = get_tx_next_msg_obj(priv);
> @@ -672,6 +676,8 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
>  		c_can_write_msg_object(dev, 0, frame, msg_obj_no, txie_off);
>  		priv->tx_next++;
>  
> +		stats->tx_bytes += frame->can_dlc;
> +		stats->tx_packets++;
>  		can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
>  		/* we have to stop the queue in case of a wrap around or
>  		 * if the next TX message object is still in use
> 


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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Re: [PATCH 00/16] Support for Eberspächer Flexcard DCAN function

[Marc Kleine-Budde]

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Hey Bene,

On 09/09/2013 09:24 AM, Benedikt Spranger wrote:
> The Eberspächer Flexcard is a multifunctional PCI Mezzanine Card. This
> patch-series adds support for the DCAN function. The Flexcard supports
> up too 8 CAN devices and has some CAN related special features:
> - own FIFO per device
> - DMA for receiving CAN frames
> - Firmware tracks CAN echo packets

Please include linux-can@vger.kernel.org when posting CAN related patches.

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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