kernel/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/platform_data/gpio-rcar.h>
  17 #include <linux/usb/phy.h>
  18 #include "common.h"
  19 #include "rcar2.h"
  20
  21 static int usbhs_rcar2_hardware_init(struct platform_device *pdev)
  22 {
  23         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  24
  25         if (IS_ENABLED(CONFIG_GENERIC_PHY)) {
  26                 struct phy *phy = phy_get(&pdev->dev, "usb");
  27
  28                 if (IS_ERR(phy))
  29                         return PTR_ERR(phy);
  30
  31                 priv->phy = phy;
  32                 return 0;
  33         }
  34
  35         if (IS_ENABLED(CONFIG_USB_PHY)) {
  36                 struct usb_phy *usb_phy = usb_get_phy_dev(&pdev->dev, 0);
  37
  38                 if (IS_ERR(usb_phy))
  39                         return PTR_ERR(usb_phy);
  40
  41                 priv->usb_phy = usb_phy;
  42                 return 0;
  43         }
  44
  45         return -ENXIO;
  46 }
  47
  48 static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
  49 {
  50         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  51
  52         if (priv->phy) {
  53                 phy_put(priv->phy);
  54                 priv->phy = NULL;
  55         }
  56
  57         if (priv->usb_phy) {
  58                 usb_put_phy(priv->usb_phy);
  59                 priv->usb_phy = NULL;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
  66                                 void __iomem *base, int enable)
  67 {
  68         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  69         int retval = -ENODEV;
  70
  71         if (priv->phy) {
  72                 if (enable) {
  73                         retval = phy_init(priv->phy);
  74
  75                         if (!retval)
  76                                 retval = phy_power_on(priv->phy);
  77                 } else {
  78                         phy_power_off(priv->phy);
  79                         phy_exit(priv->phy);
  80                         retval = 0;
  81                 }
  82         }
  83
  84         if (priv->usb_phy) {
  85                 if (enable) {
  86                         retval = usb_phy_init(priv->usb_phy);
  87
  88                         if (!retval)
  89                                 retval = usb_phy_set_suspend(priv->usb_phy, 0);
  90                 } else {
  91                         usb_phy_set_suspend(priv->usb_phy, 1);
  92                         usb_phy_shutdown(priv->usb_phy);
  93                         retval = 0;
  94                 }
  95         }
  96
  97         return retval;
  98 }
  99
 100 static int usbhs_rcar2_get_id(struct platform_device *pdev)
 101 {
 102         return USBHS_GADGET;
 103 }
 104
 105 const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
 106         .hardware_init = usbhs_rcar2_hardware_init,
 107         .hardware_exit = usbhs_rcar2_hardware_exit,
 108         .power_ctrl = usbhs_rcar2_power_ctrl,
 109         .get_id = usbhs_rcar2_get_id,
 110 };