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/platform_data/gpio-rcar.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_USB_PHY)) {
  25                 struct usb_phy *usb_phy = usb_get_phy_dev(&pdev->dev, 0);
  26
  27                 if (IS_ERR(usb_phy))
  28                         return PTR_ERR(usb_phy);
  29
  30                 priv->usb_phy = usb_phy;
  31                 return 0;
  32         }
  33
  34         return -ENXIO;
  35 }
  36
  37 static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
  38 {
  39         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  40
  41         if (priv->usb_phy) {
  42                 usb_put_phy(priv->usb_phy);
  43                 priv->usb_phy = NULL;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
  50                                 void __iomem *base, int enable)
  51 {
  52         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  53         int retval = -ENODEV;
  54
  55         if (priv->usb_phy) {
  56                 if (enable) {
  57                         retval = usb_phy_init(priv->usb_phy);
  58
  59                         if (!retval)
  60                                 retval = usb_phy_set_suspend(priv->usb_phy, 0);
  61                 } else {
  62                         usb_phy_set_suspend(priv->usb_phy, 1);
  63                         usb_phy_shutdown(priv->usb_phy);
  64                         retval = 0;
  65                 }
  66         }
  67
  68         return retval;
  69 }
  70
  71 static int usbhs_rcar2_get_id(struct platform_device *pdev)
  72 {
  73         return USBHS_GADGET;
  74 }
  75
  76 const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
  77         .hardware_init = usbhs_rcar2_hardware_init,
  78         .hardware_exit = usbhs_rcar2_hardware_exit,
  79         .power_ctrl = usbhs_rcar2_power_ctrl,
  80         .get_id = usbhs_rcar2_get_id,
  81 };