drivers/usb/renesas_usbhs/rcar2.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * Renesas USB driver R-Car Gen. 2 initialization and power control
   4  *
   5  * Copyright (C) 2014 Ulrich Hecht
   6  */
   7
   8 #include <linux/gpio.h>
   9 #include <linux/of_gpio.h>
  10 #include <linux/phy/phy.h>
  11 #include "common.h"
  12 #include "rcar2.h"
  13
  14 static int usbhs_rcar2_hardware_init(struct platform_device *pdev)
  15 {
  16         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  17
  18         if (IS_ENABLED(CONFIG_GENERIC_PHY)) {
  19                 struct phy *phy = phy_get(&pdev->dev, "usb");
  20
  21                 if (IS_ERR(phy))
  22                         return PTR_ERR(phy);
  23
  24                 priv->phy = phy;
  25                 return 0;
  26         }
  27
  28         return -ENXIO;
  29 }
  30
  31 static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
  32 {
  33         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  34
  35         if (priv->phy) {
  36                 phy_put(priv->phy);
  37                 priv->phy = NULL;
  38         }
  39
  40         return 0;
  41 }
  42
  43 static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
  44                                 void __iomem *base, int enable)
  45 {
  46         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  47         int retval = -ENODEV;
  48
  49         if (priv->phy) {
  50                 if (enable) {
  51                         retval = phy_init(priv->phy);
  52
  53                         if (!retval)
  54                                 retval = phy_power_on(priv->phy);
  55                 } else {
  56                         phy_power_off(priv->phy);
  57                         phy_exit(priv->phy);
  58                         retval = 0;
  59                 }
  60         }
  61
  62         return retval;
  63 }
  64
  65 static int usbhs_rcar2_get_id(struct platform_device *pdev)
  66 {
  67         return USBHS_GADGET;
  68 }
  69
  70 const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
  71         .hardware_init = usbhs_rcar2_hardware_init,
  72         .hardware_exit = usbhs_rcar2_hardware_exit,
  73         .power_ctrl = usbhs_rcar2_power_ctrl,
  74         .get_id = usbhs_rcar2_get_id,
  75 };