LXR linux/drivers/usb/phy/phy-am335x.c

   1#include <linux/module.h>
   2#include <linux/platform_device.h>
   3#include <linux/dma-mapping.h>
   4#include <linux/usb/otg.h>
   5#include <linux/usb/usb_phy_generic.h>
   6#include <linux/slab.h>
   7#include <linux/clk.h>
   8#include <linux/of.h>
   9#include <linux/of_address.h>
  10#include <linux/usb/of.h>
  11
  12#include "phy-am335x-control.h"
  13#include "phy-generic.h"
  14
  15struct am335x_phy {
  16        struct usb_phy_generic usb_phy_gen;
  17        struct phy_control *phy_ctrl;
  18        int id;
  19        enum usb_dr_mode dr_mode;
  20};
  21
  22static int am335x_init(struct usb_phy *phy)
  23{
  24        struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
  25
  26        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
  27        return 0;
  28}
  29
  30static void am335x_shutdown(struct usb_phy *phy)
  31{
  32        struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
  33
  34        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
  35}
  36
  37static int am335x_phy_probe(struct platform_device *pdev)
  38{
  39        struct am335x_phy *am_phy;
  40        struct device *dev = &pdev->dev;
  41        int ret;
  42
  43        am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
  44        if (!am_phy)
  45                return -ENOMEM;
  46
  47        am_phy->phy_ctrl = am335x_get_phy_control(dev);
  48        if (!am_phy->phy_ctrl)
  49                return -EPROBE_DEFER;
  50
  51        am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
  52        if (am_phy->id < 0) {
  53                dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
  54                return am_phy->id;
  55        }
  56
  57        am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
  58
  59        ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
  60        if (ret)
  61                return ret;
  62
  63        ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
  64        if (ret)
  65                return ret;
  66        am_phy->usb_phy_gen.phy.init = am335x_init;
  67        am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
  68
  69        platform_set_drvdata(pdev, am_phy);
  70        device_init_wakeup(dev, true);
  71
  72        /*
  73         * If we leave PHY wakeup enabled then AM33XX wakes up
  74         * immediately from DS0. To avoid this we mark dev->power.can_wakeup
  75         * to false. The same is checked in suspend routine to decide
  76         * on whether to enable PHY wakeup or not.
  77         * PHY wakeup works fine in standby mode, there by allowing us to
  78         * handle remote wakeup, wakeup on disconnect and connect.
  79         */
  80
  81        device_set_wakeup_enable(dev, false);
  82        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
  83
  84        return 0;
  85}
  86
  87static int am335x_phy_remove(struct platform_device *pdev)
  88{
  89        struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  90
  91        usb_remove_phy(&am_phy->usb_phy_gen.phy);
  92        return 0;
  93}
  94
  95#ifdef CONFIG_PM_SLEEP
  96static int am335x_phy_suspend(struct device *dev)
  97{
  98        struct platform_device  *pdev = to_platform_device(dev);
  99        struct am335x_phy *am_phy = platform_get_drvdata(pdev);
 100
 101        /*
 102         * Enable phy wakeup only if dev->power.can_wakeup is true.
 103         * Make sure to enable wakeup to support remote wakeup  in
 104         * standby mode ( same is not supported in OFF(DS0) mode).
 105         * Enable it by doing
 106         * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
 107         */
 108
 109        if (device_may_wakeup(dev))
 110                phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
 111
 112        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
 113
 114        return 0;
 115}
 116
 117static int am335x_phy_resume(struct device *dev)
 118{
 119        struct platform_device  *pdev = to_platform_device(dev);
 120        struct am335x_phy       *am_phy = platform_get_drvdata(pdev);
 121
 122        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
 123
 124        if (device_may_wakeup(dev))
 125                phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
 126
 127        return 0;
 128}
 129#endif
 130
 131static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
 132
 133static const struct of_device_id am335x_phy_ids[] = {
 134        { .compatible = "ti,am335x-usb-phy" },
 135        { }
 136};
 137MODULE_DEVICE_TABLE(of, am335x_phy_ids);
 138
 139static struct platform_driver am335x_phy_driver = {
 140        .probe          = am335x_phy_probe,
 141        .remove         = am335x_phy_remove,
 142        .driver         = {
 143                .name   = "am335x-phy-driver",
 144                .pm = &am335x_pm_ops,
 145                .of_match_table = am335x_phy_ids,
 146        },
 147};
 148
 149module_platform_driver(am335x_phy_driver);
 150MODULE_LICENSE("GPL v2");
 151