Commit 3ecc0985 authored by Marc Kleine-Budde's avatar Marc Kleine-Budde
Browse files

can: at91_can: add CAN transceiver support 

Add support for Linux-PHY based CAN transceivers.

Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-16-9987d53600e0@pengutronix.de


Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 99f4ff41

drivers/net/can/at91_can.c

+26 −6
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/module.h>

#include <linux/netdevice.h>

#include <linux/of.h>

#include <linux/phy/phy.h>

#include <linux/platform_device.h>

#include <linux/rtnetlink.h>

#include <linux/skbuff.h>
@@ -150,6 +151,7 @@ struct at91_devtype_data { 
struct at91_priv {

	struct can_priv can;		/* must be the first member! */

	struct napi_struct napi;

	struct phy *transceiver;



	void __iomem *reg_base;
@@ -1118,20 +1120,24 @@ static int at91_open(struct net_device *dev) 
	struct at91_priv *priv = netdev_priv(dev);

	int err;



	err = clk_prepare_enable(priv->clk);

	err = phy_power_on(priv->transceiver);

	if (err)

		return err;



	/* check or determine and set bittime */

	err = open_candev(dev);

	if (err)

		goto out;

		goto out_phy_power_off;



	err = clk_prepare_enable(priv->clk);

	if (err)

		goto out_close_candev;



	/* register interrupt handler */

	err = request_irq(dev->irq, at91_irq, IRQF_SHARED,

			  dev->name, dev);

	if (err)

		goto out_close;

		goto out_clock_disable_unprepare;



	/* start chip and queuing */

	at91_chip_start(dev);
@@ -1140,10 +1146,12 @@ static int at91_open(struct net_device *dev) 


	return 0;



 out_close:

	close_candev(dev);

 out:

 out_clock_disable_unprepare:

	clk_disable_unprepare(priv->clk);

 out_close_candev:

	close_candev(dev);

 out_phy_power_off:

	phy_power_off(priv->transceiver);



	return err;

}
@@ -1160,6 +1168,7 @@ static int at91_close(struct net_device *dev) 


	free_irq(dev->irq, dev);

	clk_disable_unprepare(priv->clk);

	phy_power_off(priv->transceiver);



	close_candev(dev);
@@ -1284,6 +1293,7 @@ static const struct at91_devtype_data *at91_can_get_driver_data(struct platform_ 
static int at91_can_probe(struct platform_device *pdev)

{

	const struct at91_devtype_data *devtype_data;

	struct phy *transceiver;

	struct net_device *dev;

	struct at91_priv *priv;

	struct resource *res;
@@ -1332,6 +1342,13 @@ static int at91_can_probe(struct platform_device *pdev) 
		goto exit_iounmap;

	}



	transceiver = devm_phy_optional_get(&pdev->dev, NULL);

	if (IS_ERR(transceiver)) {

		err = PTR_ERR(transceiver);

		dev_err_probe(&pdev->dev, err, "failed to get phy\n");

		goto exit_iounmap;

	}



	dev->netdev_ops	= &at91_netdev_ops;

	dev->ethtool_ops = &at91_ethtool_ops;

	dev->irq = irq;
@@ -1352,6 +1369,9 @@ static int at91_can_probe(struct platform_device *pdev) 


	netif_napi_add_weight(dev, &priv->napi, at91_poll, get_mb_rx_num(priv));



	if (transceiver)

		priv->can.bitrate_max = transceiver->attrs.max_link_rate;



	if (at91_is_sam9263(priv))

		dev->sysfs_groups[0] = &at91_sysfs_attr_group;