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_gen_xceiv.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_gen_xceiv 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,
  56                         USB_PHY_TYPE_USB2, 0, false);
  57         if (ret)
  58                 return ret;
  59
  60         ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
  61         if (ret)
  62                 return ret;
  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
  68         return 0;
  69
  70         return ret;
  71 }
  72
  73 static int am335x_phy_remove(struct platform_device *pdev)
  74 {
  75         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  76
  77         usb_remove_phy(&am_phy->usb_phy_gen.phy);
  78         return 0;
  79 }
  80
  81 #ifdef CONFIG_PM_RUNTIME
  82
  83 static int am335x_phy_runtime_suspend(struct device *dev)
  84 {
  85         struct platform_device  *pdev = to_platform_device(dev);
  86         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  87
  88         if (device_may_wakeup(dev))
  89                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
  90         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
  91         return 0;
  92 }
  93
  94 static int am335x_phy_runtime_resume(struct device *dev)
  95 {
  96         struct platform_device  *pdev = to_platform_device(dev);
  97         struct am335x_phy       *am_phy = platform_get_drvdata(pdev);
  98
  99         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
 100         if (device_may_wakeup(dev))
 101                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
 102         return 0;
 103 }
 104
 105 static const struct dev_pm_ops am335x_pm_ops = {
 106         SET_RUNTIME_PM_OPS(am335x_phy_runtime_suspend,
 107                         am335x_phy_runtime_resume, NULL)
 108 };
 109
 110 #define DEV_PM_OPS      (&am335x_pm_ops)
 111 #else
 112 #define DEV_PM_OPS      NULL
 113 #endif
 114
 115 static const struct of_device_id am335x_phy_ids[] = {
 116         { .compatible = "ti,am335x-usb-phy" },
 117         { }
 118 };
 119 MODULE_DEVICE_TABLE(of, am335x_phy_ids);
 120
 121 static struct platform_driver am335x_phy_driver = {
 122         .probe          = am335x_phy_probe,
 123         .remove         = am335x_phy_remove,
 124         .driver         = {
 125                 .name   = "am335x-phy-driver",
 126                 .owner  = THIS_MODULE,
 127                 .pm = DEV_PM_OPS,
 128                 .of_match_table = am335x_phy_ids,
 129         },
 130 };
 131
 132 module_platform_driver(am335x_phy_driver);
 133 MODULE_LICENSE("GPL v2");