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/of_device.h>
  12 #include <linux/phy/phy.h>
  13 #include "common.h"
  14 #include "rza.h"
  15
  16 static int usbhs_rza2_hardware_init(struct platform_device *pdev)
  17 {
  18         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  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 static int usbhs_rza2_hardware_exit(struct platform_device *pdev)
  29 {
  30         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  31
  32         phy_put(&pdev->dev, priv->phy);
  33         priv->phy = NULL;
  34
  35         return 0;
  36 }
  37
  38 static int usbhs_rza2_power_ctrl(struct platform_device *pdev,
  39                                 void __iomem *base, int enable)
  40 {
  41         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  42         int retval = 0;
  43
  44         if (!priv->phy)
  45                 return -ENODEV;
  46
  47         if (enable) {
  48                 retval = phy_init(priv->phy);
  49                 usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM);
  50                 udelay(100);    /* Wait for PLL to become stable */
  51                 if (!retval)
  52                         retval = phy_power_on(priv->phy);
  53         } else {
  54                 usbhs_bset(priv, SUSPMODE, SUSPM, 0);
  55                 phy_power_off(priv->phy);
  56                 phy_exit(priv->phy);
  57         }
  58
  59         return retval;
  60 }
  61
  62 const struct renesas_usbhs_platform_info usbhs_rza2_plat_info = {
  63         .platform_callback = {
  64                 .hardware_init = usbhs_rza2_hardware_init,
  65                 .hardware_exit = usbhs_rza2_hardware_exit,
  66                 .power_ctrl = usbhs_rza2_power_ctrl,
  67                 .get_id = usbhs_get_id_as_gadget,
  68         },
  69         .driver_param = {
  70                 .has_cnen = 1,
  71                 .cfifo_byte_addr = 1,
  72                 .has_new_pipe_configs = 1,
  73         },
  74 };