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
  15 struct 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
  22 static 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
  30 static 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
  37 static 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         am_phy->usb_phy_gen.phy.init = am335x_init;
  64         am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
  65
  66         platform_set_drvdata(pdev, am_phy);
  67         device_init_wakeup(dev, true);
  68
  69         /*
  70          * If we leave PHY wakeup enabled then AM33XX wakes up
  71          * immediately from DS0. To avoid this we mark dev->power.can_wakeup
  72          * to false. The same is checked in suspend routine to decide
  73          * on whether to enable PHY wakeup or not.
  74          * PHY wakeup works fine in standby mode, there by allowing us to
  75          * handle remote wakeup, wakeup on disconnect and connect.
  76          */
  77
  78         device_set_wakeup_enable(dev, false);
  79         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
  80
  81         return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
  82 }
  83
  84 static int am335x_phy_remove(struct platform_device *pdev)
  85 {
  86         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  87
  88         usb_remove_phy(&am_phy->usb_phy_gen.phy);
  89         return 0;
  90 }
  91
  92 #ifdef CONFIG_PM_SLEEP
  93 static int am335x_phy_suspend(struct device *dev)
  94 {
  95         struct platform_device  *pdev = to_platform_device(dev);
  96         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  97
  98         /*
  99          * Enable phy wakeup only if dev->power.can_wakeup is true.
 100          * Make sure to enable wakeup to support remote wakeup  in
 101          * standby mode ( same is not supported in OFF(DS0) mode).
 102          * Enable it by doing
 103          * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
 104          */
 105
 106         if (device_may_wakeup(dev))
 107                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
 108
 109         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
 110
 111         return 0;
 112 }
 113
 114 static int am335x_phy_resume(struct device *dev)
 115 {
 116         struct platform_device  *pdev = to_platform_device(dev);
 117         struct am335x_phy       *am_phy = platform_get_drvdata(pdev);
 118
 119         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
 120
 121         if (device_may_wakeup(dev))
 122                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
 123
 124         return 0;
 125 }
 126 #endif
 127
 128 static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
 129
 130 static const struct of_device_id am335x_phy_ids[] = {
 131         { .compatible = "ti,am335x-usb-phy" },
 132         { }
 133 };
 134 MODULE_DEVICE_TABLE(of, am335x_phy_ids);
 135
 136 static struct platform_driver am335x_phy_driver = {
 137         .probe          = am335x_phy_probe,
 138         .remove         = am335x_phy_remove,
 139         .driver         = {
 140                 .name   = "am335x-phy-driver",
 141                 .pm = &am335x_pm_ops,
 142                 .of_match_table = am335x_phy_ids,
 143         },
 144 };
 145
 146 module_platform_driver(am335x_phy_driver);
 147 MODULE_LICENSE("GPL v2");