Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / usb / phy / phy-am335x.c

diff --git a/kernel/drivers/usb/phy/phy-am335x.c b/kernel/drivers/usb/phy/phy-am335x.c
new file mode 100644 (file)
index 0000000..90b67a4
--- /dev/null
+++ b/kernel/drivers/usb/phy/phy-am335x.c
@@ -0,0 +1,146 @@
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/usb_phy_generic.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/regulator/consumer.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "am35x-phy-control.h"
+#include "phy-generic.h"
+
+struct am335x_phy {
+       struct usb_phy_generic usb_phy_gen;
+       struct phy_control *phy_ctrl;
+       int id;
+};
+
+static int am335x_init(struct usb_phy *phy)
+{
+       struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
+
+       phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
+       return 0;
+}
+
+static void am335x_shutdown(struct usb_phy *phy)
+{
+       struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
+
+       phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
+}
+
+static int am335x_phy_probe(struct platform_device *pdev)
+{
+       struct am335x_phy *am_phy;
+       struct device *dev = &pdev->dev;
+       int ret;
+
+       am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
+       if (!am_phy)
+               return -ENOMEM;
+
+       am_phy->phy_ctrl = am335x_get_phy_control(dev);
+       if (!am_phy->phy_ctrl)
+               return -EPROBE_DEFER;
+       am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
+       if (am_phy->id < 0) {
+               dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
+               return am_phy->id;
+       }
+
+       ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
+       if (ret)
+               return ret;
+
+       ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
+       if (ret)
+               return ret;
+       am_phy->usb_phy_gen.phy.init = am335x_init;
+       am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
+
+       platform_set_drvdata(pdev, am_phy);
+       device_init_wakeup(dev, true);
+
+       /*
+        * If we leave PHY wakeup enabled then AM33XX wakes up
+        * immediately from DS0. To avoid this we mark dev->power.can_wakeup
+        * to false. The same is checked in suspend routine to decide
+        * on whether to enable PHY wakeup or not.
+        * PHY wakeup works fine in standby mode, there by allowing us to
+        * handle remote wakeup, wakeup on disconnect and connect.
+        */
+
+       device_set_wakeup_enable(dev, false);
+       phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
+
+       return 0;
+}
+
+static int am335x_phy_remove(struct platform_device *pdev)
+{
+       struct am335x_phy *am_phy = platform_get_drvdata(pdev);
+
+       usb_remove_phy(&am_phy->usb_phy_gen.phy);
+       return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int am335x_phy_suspend(struct device *dev)
+{
+       struct platform_device  *pdev = to_platform_device(dev);
+       struct am335x_phy *am_phy = platform_get_drvdata(pdev);
+
+       /*
+        * Enable phy wakeup only if dev->power.can_wakeup is true.
+        * Make sure to enable wakeup to support remote wakeup  in
+        * standby mode ( same is not supported in OFF(DS0) mode).
+        * Enable it by doing
+        * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
+        */
+
+       if (device_may_wakeup(dev))
+               phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
+
+       phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
+
+       return 0;
+}
+
+static int am335x_phy_resume(struct device *dev)
+{
+       struct platform_device  *pdev = to_platform_device(dev);
+       struct am335x_phy       *am_phy = platform_get_drvdata(pdev);
+
+       phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
+
+       if (device_may_wakeup(dev))
+               phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
+
+       return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
+
+static const struct of_device_id am335x_phy_ids[] = {
+       { .compatible = "ti,am335x-usb-phy" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, am335x_phy_ids);
+
+static struct platform_driver am335x_phy_driver = {
+       .probe          = am335x_phy_probe,
+       .remove         = am335x_phy_remove,
+       .driver         = {
+               .name   = "am335x-phy-driver",
+               .pm = &am335x_pm_ops,
+               .of_match_table = am335x_phy_ids,
+       },
+};
+
+module_platform_driver(am335x_phy_driver);
+MODULE_LICENSE("GPL v2");