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can: at91_can: add CAN transceiver support

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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: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2023-05-01 18:14:41 +02:00
parent 99f4ff41bb
commit 3ecc09856a
1 changed files with 26 additions and 6 deletions
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32
drivers/net/can/at91_can.c
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@ -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;