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can: m_can: Add PM Support
Add support for CONFIG_PM which is the new way to handle managing clocks. Move the clock management to pm_runtime_resume() and pm_runtime_suspend() callbacks for the driver. CONFIG_PM is required by OMAP based devices to handle clock management. Therefore, this allows future Texas Instruments SoCs that have the MCAN IP to work with this driver. Signed-off-by: Faiz Abbas <faiz_abbas@ti.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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@ -23,6 +23,7 @@
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/iopoll.h>
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#include <linux/can/dev.h>
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@ -631,21 +632,16 @@ static int m_can_clk_start(struct m_can_priv *priv)
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{
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int err;
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err = clk_prepare_enable(priv->hclk);
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err = pm_runtime_get_sync(priv->device);
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if (err)
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return err;
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err = clk_prepare_enable(priv->cclk);
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if (err)
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clk_disable_unprepare(priv->hclk);
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pm_runtime_put_noidle(priv->device);
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return err;
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}
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static void m_can_clk_stop(struct m_can_priv *priv)
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{
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clk_disable_unprepare(priv->cclk);
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clk_disable_unprepare(priv->hclk);
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pm_runtime_put_sync(priv->device);
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}
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static int m_can_get_berr_counter(const struct net_device *dev,
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@ -1594,37 +1590,26 @@ static int m_can_plat_probe(struct platform_device *pdev)
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goto failed_ret;
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}
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/* Enable clocks. Necessary to read Core Release in order to determine
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* M_CAN version
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*/
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ret = clk_prepare_enable(hclk);
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if (ret)
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goto disable_hclk_ret;
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ret = clk_prepare_enable(cclk);
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if (ret)
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goto disable_cclk_ret;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
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addr = devm_ioremap_resource(&pdev->dev, res);
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irq = platform_get_irq_byname(pdev, "int0");
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if (IS_ERR(addr) || irq < 0) {
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ret = -EINVAL;
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goto disable_cclk_ret;
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goto failed_ret;
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}
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/* message ram could be shared */
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
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if (!res) {
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ret = -ENODEV;
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goto disable_cclk_ret;
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goto failed_ret;
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}
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mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
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if (!mram_addr) {
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ret = -ENOMEM;
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goto disable_cclk_ret;
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goto failed_ret;
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}
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/* get message ram configuration */
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@ -1633,7 +1618,7 @@ static int m_can_plat_probe(struct platform_device *pdev)
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sizeof(mram_config_vals) / 4);
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if (ret) {
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dev_err(&pdev->dev, "Could not get Message RAM configuration.");
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goto disable_cclk_ret;
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goto failed_ret;
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}
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/* Get TX FIFO size
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@ -1645,13 +1630,9 @@ static int m_can_plat_probe(struct platform_device *pdev)
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dev = alloc_candev(sizeof(*priv), tx_fifo_size);
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if (!dev) {
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ret = -ENOMEM;
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goto disable_cclk_ret;
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goto failed_ret;
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}
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ret = m_can_dev_setup(pdev, dev, addr);
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if (ret)
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goto failed_free_dev;
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priv = netdev_priv(dev);
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dev->irq = irq;
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priv->device = &pdev->dev;
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@ -1665,11 +1646,23 @@ static int m_can_plat_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, dev);
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SET_NETDEV_DEV(dev, &pdev->dev);
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/* Enable clocks. Necessary to read Core Release in order to determine
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* M_CAN version
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*/
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pm_runtime_enable(&pdev->dev);
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ret = m_can_clk_start(priv);
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if (ret)
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goto pm_runtime_fail;
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ret = m_can_dev_setup(pdev, dev, addr);
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if (ret)
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goto clk_disable;
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ret = register_m_can_dev(dev);
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if (ret) {
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dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
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KBUILD_MODNAME, ret);
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goto failed_free_dev;
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goto clk_disable;
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}
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devm_can_led_init(dev);
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@ -1680,15 +1673,13 @@ static int m_can_plat_probe(struct platform_device *pdev)
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/* Probe finished
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* Stop clocks. They will be reactivated once the M_CAN device is opened
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*/
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goto disable_cclk_ret;
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failed_free_dev:
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free_candev(dev);
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disable_cclk_ret:
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clk_disable_unprepare(cclk);
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disable_hclk_ret:
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clk_disable_unprepare(hclk);
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clk_disable:
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m_can_clk_stop(priv);
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pm_runtime_fail:
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if (ret) {
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pm_runtime_disable(&pdev->dev);
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free_candev(dev);
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}
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failed_ret:
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return ret;
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}
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@ -1746,6 +1737,9 @@ static int m_can_plat_remove(struct platform_device *pdev)
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struct net_device *dev = platform_get_drvdata(pdev);
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unregister_m_can_dev(dev);
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pm_runtime_disable(&pdev->dev);
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platform_set_drvdata(pdev, NULL);
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free_candev(dev);
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@ -1753,7 +1747,37 @@ static int m_can_plat_remove(struct platform_device *pdev)
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return 0;
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}
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static int m_can_runtime_suspend(struct device *dev)
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{
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struct net_device *ndev = dev_get_drvdata(dev);
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struct m_can_priv *priv = netdev_priv(ndev);
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clk_disable_unprepare(priv->cclk);
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clk_disable_unprepare(priv->hclk);
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return 0;
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}
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static int m_can_runtime_resume(struct device *dev)
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{
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struct net_device *ndev = dev_get_drvdata(dev);
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struct m_can_priv *priv = netdev_priv(ndev);
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int err;
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err = clk_prepare_enable(priv->hclk);
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if (err)
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return err;
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err = clk_prepare_enable(priv->cclk);
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if (err)
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clk_disable_unprepare(priv->hclk);
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return err;
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}
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static const struct dev_pm_ops m_can_pmops = {
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SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
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m_can_runtime_resume, NULL)
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SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
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};
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