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         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
  87 static 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
  96 static 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
 117 static 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
 131 static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
 132
 133 static const struct of_device_id am335x_phy_ids[] = {
 134         { .compatible = "ti,am335x-usb-phy" },
 135         { }
 136 };
 137 MODULE_DEVICE_TABLE(of, am335x_phy_ids);
 138
 139 static 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
 149 module_platform_driver(am335x_phy_driver);
 150 MODULE_LICENSE("GPL v2");