drivers/usb/renesas_usbhs/rcar2.c

   1 /*
   2  * Renesas USB driver R-Car Gen. 2 initialization and power control
   3  *
   4  * Copyright (C) 2014 Ulrich Hecht
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  */
  12
  13 #include <linux/gpio.h>
  14 #include <linux/of_gpio.h>
  15 #include <linux/phy/phy.h>
  16 #include <linux/usb/phy.h>
  17 #include "common.h"
  18 #include "rcar2.h"
  19
  20 static int usbhs_rcar2_hardware_init(struct platform_device *pdev)
  21 {
  22         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  23
  24         if (IS_ENABLED(CONFIG_GENERIC_PHY)) {
  25                 struct phy *phy = phy_get(&pdev->dev, "usb");
  26
  27                 if (IS_ERR(phy))
  28                         return PTR_ERR(phy);
  29
  30                 priv->phy = phy;
  31                 return 0;
  32         }
  33
  34         if (IS_ENABLED(CONFIG_USB_PHY)) {
  35                 struct usb_phy *usb_phy = usb_get_phy_dev(&pdev->dev, 0);
  36
  37                 if (IS_ERR(usb_phy))
  38                         return PTR_ERR(usb_phy);
  39
  40                 priv->usb_phy = usb_phy;
  41                 return 0;
  42         }
  43
  44         return -ENXIO;
  45 }
  46
  47 static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
  48 {
  49         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  50
  51         if (priv->phy) {
  52                 phy_put(priv->phy);
  53                 priv->phy = NULL;
  54         }
  55
  56         if (priv->usb_phy) {
  57                 usb_put_phy(priv->usb_phy);
  58                 priv->usb_phy = NULL;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
  65                                 void __iomem *base, int enable)
  66 {
  67         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  68         int retval = -ENODEV;
  69
  70         if (priv->phy) {
  71                 if (enable) {
  72                         retval = phy_init(priv->phy);
  73
  74                         if (!retval)
  75                                 retval = phy_power_on(priv->phy);
  76                 } else {
  77                         phy_power_off(priv->phy);
  78                         phy_exit(priv->phy);
  79                         retval = 0;
  80                 }
  81         }
  82
  83         if (priv->usb_phy) {
  84                 if (enable) {
  85                         retval = usb_phy_init(priv->usb_phy);
  86
  87                         if (!retval)
  88                                 retval = usb_phy_set_suspend(priv->usb_phy, 0);
  89                 } else {
  90                         usb_phy_set_suspend(priv->usb_phy, 1);
  91                         usb_phy_shutdown(priv->usb_phy);
  92                         retval = 0;
  93                 }
  94         }
  95
  96         return retval;
  97 }
  98
  99 static int usbhs_rcar2_get_id(struct platform_device *pdev)
 100 {
 101         return USBHS_GADGET;
 102 }
 103
 104 const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
 105         .hardware_init = usbhs_rcar2_hardware_init,
 106         .hardware_exit = usbhs_rcar2_hardware_exit,
 107         .power_ctrl = usbhs_rcar2_power_ctrl,
 108         .get_id = usbhs_rcar2_get_id,
 109 };