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/slab.h>
   5 #include <linux/clk.h>
   6 #include <linux/of.h>
   7 #include <linux/of_address.h>
   8 #include <linux/regulator/consumer.h>
   9 #include <linux/usb/otg.h>
  10 #include <linux/usb/usb_phy_generic.h>
  11
  12 #include "am35x-phy-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 };
  20
  21 static int am335x_init(struct usb_phy *phy)
  22 {
  23         struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
  24
  25         usb_gen_phy_init(phy);
  26         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, 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, false);
  35         usb_gen_phy_shutdown(phy);
  36 }
  37
  38 static int am335x_phy_probe(struct platform_device *pdev)
  39 {
  40         struct am335x_phy *am_phy;
  41         struct device *dev = &pdev->dev;
  42         int ret;
  43
  44         am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
  45         if (!am_phy)
  46                 return -ENOMEM;
  47
  48         am_phy->phy_ctrl = am335x_get_phy_control(dev);
  49         if (!am_phy->phy_ctrl)
  50                 return -EPROBE_DEFER;
  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         ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
  58         if (ret)
  59                 return ret;
  60
  61         am_phy->usb_phy_gen.phy.init = am335x_init;
  62         am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
  63
  64         ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
  65         if (ret)
  66                 return ret;
  67
  68         platform_set_drvdata(pdev, am_phy);
  69         device_init_wakeup(dev, true);
  70
  71         /*
  72          * If we leave PHY wakeup enabled then AM33XX wakes up
  73          * immediately from DS0. To avoid this we mark dev->power.can_wakeup
  74          * to false. The same is checked in suspend routine to decide
  75          * on whether to enable PHY wakeup or not.
  76          * PHY wakeup works fine in standby mode, there by allowing us to
  77          * handle remote wakeup, wakeup on disconnect and connect.
  78          */
  79
  80         device_set_wakeup_enable(dev, false);
  81         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
  82
  83         return 0;
  84 }
  85
  86 static int am335x_phy_remove(struct platform_device *pdev)
  87 {
  88         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  89
  90         usb_remove_phy(&am_phy->usb_phy_gen.phy);
  91         return 0;
  92 }
  93
  94 #ifdef CONFIG_PM_SLEEP
  95 static int am335x_phy_suspend(struct device *dev)
  96 {
  97         struct platform_device  *pdev = to_platform_device(dev);
  98         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  99
 100         /*
 101          * Enable phy wakeup only if dev->power.can_wakeup is true.
 102          * Make sure to enable wakeup to support remote wakeup  in
 103          * standby mode ( same is not supported in OFF(DS0) mode).
 104          * Enable it by doing
 105          * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
 106          */
 107
 108         if (device_may_wakeup(dev))
 109                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
 110
 111         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
 112
 113         return 0;
 114 }
 115
 116 static int am335x_phy_resume(struct device *dev)
 117 {
 118         struct platform_device  *pdev = to_platform_device(dev);
 119         struct am335x_phy       *am_phy = platform_get_drvdata(pdev);
 120
 121         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
 122
 123         if (device_may_wakeup(dev))
 124                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
 125
 126         return 0;
 127 }
 128 #endif
 129
 130 static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
 131
 132 static const struct of_device_id am335x_phy_ids[] = {
 133         { .compatible = "ti,am335x-usb-phy" },
 134         { }
 135 };
 136 MODULE_DEVICE_TABLE(of, am335x_phy_ids);
 137
 138 static struct platform_driver am335x_phy_driver = {
 139         .probe          = am335x_phy_probe,
 140         .remove         = am335x_phy_remove,
 141         .driver         = {
 142                 .name   = "am335x-phy-driver",
 143                 .pm = &am335x_pm_ops,
 144                 .of_match_table = am335x_phy_ids,
 145         },
 146 };
 147
 148 module_platform_driver(am335x_phy_driver);
 149 MODULE_LICENSE("GPL v2");