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