drivers/usb/renesas_usbhs/rza2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Renesas USB driver RZ/A2 initialization and power control
   4  *
   5  * Copyright (C) 2019 Chris Brandt
   6  * Copyright (C) 2019 Renesas Electronics Corporation
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/io.h>
  11 #include <linux/phy/phy.h>
  12 #include "common.h"
  13 #include "rza.h"
  14
  15 static int usbhs_rza2_hardware_init(struct platform_device *pdev)
  16 {
  17         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  18         struct phy *phy = phy_get(&pdev->dev, "usb");
  19
  20         if (IS_ERR(phy))
  21                 return PTR_ERR(phy);
  22
  23         priv->phy = phy;
  24         return 0;
  25 }
  26
  27 static int usbhs_rza2_hardware_exit(struct platform_device *pdev)
  28 {
  29         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  30
  31         phy_put(&pdev->dev, priv->phy);
  32         priv->phy = NULL;
  33
  34         return 0;
  35 }
  36
  37 static int usbhs_rza2_power_ctrl(struct platform_device *pdev,
  38                                 void __iomem *base, int enable)
  39 {
  40         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  41         int retval = 0;
  42
  43         if (!priv->phy)
  44                 return -ENODEV;
  45
  46         if (enable) {
  47                 retval = phy_init(priv->phy);
  48                 usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM);
  49                 udelay(100);    /* Wait for PLL to become stable */
  50                 if (!retval)
  51                         retval = phy_power_on(priv->phy);
  52         } else {
  53                 usbhs_bset(priv, SUSPMODE, SUSPM, 0);
  54                 phy_power_off(priv->phy);
  55                 phy_exit(priv->phy);
  56         }
  57
  58         return retval;
  59 }
  60
  61 const struct renesas_usbhs_platform_info usbhs_rza2_plat_info = {
  62         .platform_callback = {
  63                 .hardware_init = usbhs_rza2_hardware_init,
  64                 .hardware_exit = usbhs_rza2_hardware_exit,
  65                 .power_ctrl = usbhs_rza2_power_ctrl,
  66                 .get_id = usbhs_get_id_as_gadget,
  67         },
  68         .driver_param = {
  69                 .has_cnen = 1,
  70                 .cfifo_byte_addr = 1,
  71                 .has_new_pipe_configs = 1,
  72         },
  73 };