diff options
| -rw-r--r-- | drivers/net/can/xilinx_can.c | 176 |
1 files changed, 101 insertions, 75 deletions
diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c index fc55e8e0351d..ad3806542d33 100644 --- a/drivers/net/can/xilinx_can.c +++ b/drivers/net/can/xilinx_can.c @@ -32,6 +32,7 @@ #include <linux/can/dev.h> #include <linux/can/error.h> #include <linux/can/led.h> +#include <linux/pm_runtime.h> #define DRIVER_NAME "xilinx_can" @@ -138,7 +139,7 @@ struct xcan_priv { u32 (*read_reg)(const struct xcan_priv *priv, enum xcan_reg reg); void (*write_reg)(const struct xcan_priv *priv, enum xcan_reg reg, u32 val); - struct net_device *dev; + struct device *dev; void __iomem *reg_base; unsigned long irq_flags; struct clk *bus_clk; @@ -843,6 +844,13 @@ static int xcan_open(struct net_device *ndev) struct xcan_priv *priv = netdev_priv(ndev); int ret; + ret = pm_runtime_get_sync(priv->dev); + if (ret < 0) { + netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n", + __func__, ret); + return ret; + } + ret = request_irq(ndev->irq, xcan_interrupt, priv->irq_flags, ndev->name, ndev); if (ret < 0) { @@ -850,29 +858,17 @@ static int xcan_open(struct net_device *ndev) goto err; } - ret = clk_prepare_enable(priv->can_clk); - if (ret) { - netdev_err(ndev, "unable to enable device clock\n"); - goto err_irq; - } - - ret = clk_prepare_enable(priv->bus_clk); - if (ret) { - netdev_err(ndev, "unable to enable bus clock\n"); - goto err_can_clk; - } - /* Set chip into reset mode */ ret = set_reset_mode(ndev); if (ret < 0) { netdev_err(ndev, "mode resetting failed!\n"); - goto err_bus_clk; + goto err_irq; } /* Common open */ ret = open_candev(ndev); if (ret) - goto err_bus_clk; + goto err_irq; ret = xcan_chip_start(ndev); if (ret < 0) { @@ -888,13 +884,11 @@ static int xcan_open(struct net_device *ndev) err_candev: close_candev(ndev); -err_bus_clk: - clk_disable_unprepare(priv->bus_clk); -err_can_clk: - clk_disable_unprepare(priv->can_clk); err_irq: free_irq(ndev->irq, ndev); err: + pm_runtime_put(priv->dev); + return ret; } @@ -911,12 +905,11 @@ static int xcan_close(struct net_device *ndev) netif_stop_queue(ndev); napi_disable(&priv->napi); xcan_chip_stop(ndev); - clk_disable_unprepare(priv->bus_clk); - clk_disable_unprepare(priv->can_clk); free_irq(ndev->irq, ndev); close_candev(ndev); can_led_event(ndev, CAN_LED_EVENT_STOP); + pm_runtime_put(priv->dev); return 0; } @@ -935,27 +928,20 @@ static int xcan_get_berr_counter(const struct net_device *ndev, struct xcan_priv *priv = netdev_priv(ndev); int ret; - ret = clk_prepare_enable(priv->can_clk); - if (ret) - goto err; - - ret = clk_prepare_enable(priv->bus_clk); - if (ret) - goto err_clk; + ret = pm_runtime_get_sync(priv->dev); + if (ret < 0) { + netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n", + __func__, ret); + return ret; + } bec->txerr = priv->read_reg(priv, XCAN_ECR_OFFSET) & XCAN_ECR_TEC_MASK; bec->rxerr = ((priv->read_reg(priv, XCAN_ECR_OFFSET) & XCAN_ECR_REC_MASK) >> XCAN_ESR_REC_SHIFT); - clk_disable_unprepare(priv->bus_clk); - clk_disable_unprepare(priv->can_clk); + pm_runtime_put(priv->dev); return 0; - -err_clk: - clk_disable_unprepare(priv->can_clk); -err: - return ret; } @@ -968,15 +954,45 @@ static const struct net_device_ops xcan_netdev_ops = { /** * xcan_suspend - Suspend method for the driver - * @dev: Address of the platform_device structure + * @dev: Address of the device structure * * Put the driver into low power mode. - * Return: 0 always + * Return: 0 on success and failure value on error */ static int __maybe_unused xcan_suspend(struct device *dev) { - struct platform_device *pdev = dev_get_drvdata(dev); - struct net_device *ndev = platform_get_drvdata(pdev); + if (!device_may_wakeup(dev)) + return pm_runtime_force_suspend(dev); + + return 0; +} + +/** + * xcan_resume - Resume from suspend + * @dev: Address of the device structure + * + * Resume operation after suspend. + * Return: 0 on success and failure value on error + */ +static int __maybe_unused xcan_resume(struct device *dev) +{ + if (!device_may_wakeup(dev)) + return pm_runtime_force_resume(dev); + + return 0; + +} + +/** + * xcan_runtime_suspend - Runtime suspend method for the driver + * @dev: Address of the device structure + * + * Put the driver into low power mode. + * Return: 0 always + */ +static int __maybe_unused xcan_runtime_suspend(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); struct xcan_priv *priv = netdev_priv(ndev); if (netif_running(ndev)) { @@ -987,43 +1003,55 @@ static int __maybe_unused xcan_suspend(struct device *dev) priv->write_reg(priv, XCAN_MSR_OFFSET, XCAN_MSR_SLEEP_MASK); priv->can.state = CAN_STATE_SLEEPING; - clk_disable(priv->bus_clk); - clk_disable(priv->can_clk); + clk_disable_unprepare(priv->bus_clk); + clk_disable_unprepare(priv->can_clk); return 0; } /** - * xcan_resume - Resume from suspend - * @dev: Address of the platformdevice structure + * xcan_runtime_resume - Runtime resume from suspend + * @dev: Address of the device structure * * Resume operation after suspend. * Return: 0 on success and failure value on error */ -static int __maybe_unused xcan_resume(struct device *dev) +static int __maybe_unused xcan_runtime_resume(struct device *dev) { - struct platform_device *pdev = dev_get_drvdata(dev); - struct net_device *ndev = platform_get_drvdata(pdev); + struct net_device *ndev = dev_get_drvdata(dev); struct xcan_priv *priv = netdev_priv(ndev); int ret; + u32 isr, status; - ret = clk_enable(priv->bus_clk); + ret = clk_prepare_enable(priv->bus_clk); if (ret) { dev_err(dev, "Cannot enable clock.\n"); return ret; } - ret = clk_enable(priv->can_clk); + ret = clk_prepare_enable(priv->can_clk); if (ret) { dev_err(dev, "Cannot enable clock.\n"); clk_disable_unprepare(priv->bus_clk); return ret; } - priv->write_reg(priv, XCAN_MSR_OFFSET, 0); - priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_CEN_MASK); - priv->can.state = CAN_STATE_ERROR_ACTIVE; + priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_RESET_MASK); + isr = priv->read_reg(priv, XCAN_ISR_OFFSET); + status = priv->read_reg(priv, XCAN_SR_OFFSET); if (netif_running(ndev)) { + if (isr & XCAN_IXR_BSOFF_MASK) { + priv->can.state = CAN_STATE_BUS_OFF; + priv->write_reg(priv, XCAN_SRR_OFFSET, + XCAN_SRR_RESET_MASK); + } else if ((status & XCAN_SR_ESTAT_MASK) == + XCAN_SR_ESTAT_MASK) { + priv->can.state = CAN_STATE_ERROR_PASSIVE; + } else if (status & XCAN_SR_ERRWRN_MASK) { + priv->can.state = CAN_STATE_ERROR_WARNING; + } else { + priv->can.state = CAN_STATE_ERROR_ACTIVE; + } netif_device_attach(ndev); netif_start_queue(ndev); } @@ -1031,7 +1059,10 @@ static int __maybe_unused xcan_resume(struct device *dev) return 0; } -static SIMPLE_DEV_PM_OPS(xcan_dev_pm_ops, xcan_suspend, xcan_resume); +static const struct dev_pm_ops xcan_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(xcan_suspend, xcan_resume) + SET_RUNTIME_PM_OPS(xcan_runtime_suspend, xcan_runtime_resume, NULL) +}; /** * xcan_probe - Platform registration call @@ -1072,7 +1103,7 @@ static int xcan_probe(struct platform_device *pdev) return -ENOMEM; priv = netdev_priv(ndev); - priv->dev = ndev; + priv->dev = &pdev->dev; priv->can.bittiming_const = &xcan_bittiming_const; priv->can.do_set_mode = xcan_do_set_mode; priv->can.do_get_berr_counter = xcan_get_berr_counter; @@ -1114,21 +1145,17 @@ static int xcan_probe(struct platform_device *pdev) } } - ret = clk_prepare_enable(priv->can_clk); - if (ret) { - dev_err(&pdev->dev, "unable to enable device clock\n"); - goto err_free; - } - - ret = clk_prepare_enable(priv->bus_clk); - if (ret) { - dev_err(&pdev->dev, "unable to enable bus clock\n"); - goto err_unprepare_disable_dev; - } - priv->write_reg = xcan_write_reg_le; priv->read_reg = xcan_read_reg_le; + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n", + __func__, ret); + goto err_pmdisable; + } + if (priv->read_reg(priv, XCAN_SR_OFFSET) != XCAN_SR_CONFIG_MASK) { priv->write_reg = xcan_write_reg_be; priv->read_reg = xcan_read_reg_be; @@ -1141,22 +1168,23 @@ static int xcan_probe(struct platform_device *pdev) ret = register_candev(ndev); if (ret) { dev_err(&pdev->dev, "fail to register failed (err=%d)\n", ret); - goto err_unprepare_disable_busclk; + goto err_disableclks; } devm_can_led_init(ndev); - clk_disable_unprepare(priv->bus_clk); - clk_disable_unprepare(priv->can_clk); + + pm_runtime_put(&pdev->dev); + netdev_dbg(ndev, "reg_base=0x%p irq=%d clock=%d, tx fifo depth:%d\n", priv->reg_base, ndev->irq, priv->can.clock.freq, priv->tx_max); return 0; -err_unprepare_disable_busclk: - clk_disable_unprepare(priv->bus_clk); -err_unprepare_disable_dev: - clk_disable_unprepare(priv->can_clk); +err_disableclks: + pm_runtime_put(priv->dev); +err_pmdisable: + pm_runtime_disable(&pdev->dev); err_free: free_candev(ndev); err: @@ -1175,10 +1203,8 @@ static int xcan_remove(struct platform_device *pdev) struct net_device *ndev = platform_get_drvdata(pdev); struct xcan_priv *priv = netdev_priv(ndev); - if (set_reset_mode(ndev) < 0) - netdev_err(ndev, "mode resetting failed!\n"); - unregister_candev(ndev); + pm_runtime_disable(&pdev->dev); netif_napi_del(&priv->napi); free_candev(ndev); |
