drivers/usb/renesas_usbhs/rcar3.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Renesas USB driver R-Car Gen. 3 initialization and power control
   4  *
   5  * Copyright (C) 2016 Renesas Electronics Corporation
   6  */
   7
   8 #include <linux/delay.h>
   9 #include <linux/io.h>
  10 #include "common.h"
  11 #include "rcar3.h"
  12
  13 #define LPSTS           0x102
  14 #define UGCTRL          0x180   /* 32-bit register */
  15 #define UGCTRL2         0x184   /* 32-bit register */
  16 #define UGSTS           0x188   /* 32-bit register */
  17
  18 /* Low Power Status register (LPSTS) */
  19 #define LPSTS_SUSPM     0x4000
  20
  21 /* R-Car D3 only: USB General control register (UGCTRL) */
  22 #define UGCTRL_PLLRESET         0x00000001
  23 #define UGCTRL_CONNECT          0x00000004
  24
  25 /*
  26  * USB General control register 2 (UGCTRL2)
  27  * Remarks: bit[31:11] and bit[9:6] should be 0
  28  */
  29 #define UGCTRL2_RESERVED_3      0x00000001      /* bit[3:0] should be B'0001 */
  30 #define UGCTRL2_USB0SEL_HSUSB   0x00000020
  31 #define UGCTRL2_USB0SEL_OTG     0x00000030
  32 #define UGCTRL2_VBUSSEL         0x00000400
  33
  34 /* R-Car D3 only: USB General status register (UGSTS) */
  35 #define UGSTS_LOCK              0x00000100
  36
  37 static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
  38 {
  39         iowrite32(data, priv->base + reg);
  40 }
  41
  42 static u32 usbhs_read32(struct usbhs_priv *priv, u32 reg)
  43 {
  44         return ioread32(priv->base + reg);
  45 }
  46
  47 static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
  48                                 void __iomem *base, int enable)
  49 {
  50         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  51
  52         usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 | UGCTRL2_USB0SEL_OTG |
  53                       UGCTRL2_VBUSSEL);
  54
  55         if (enable) {
  56                 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
  57                 /* The controller on R-Car Gen3 needs to wait up to 45 usec */
  58                 udelay(45);
  59         } else {
  60                 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
  61         }
  62
  63         return 0;
  64 }
  65
  66 /* R-Car D3 needs to release UGCTRL.PLLRESET */
  67 static int usbhs_rcar3_power_and_pll_ctrl(struct platform_device *pdev,
  68                                           void __iomem *base, int enable)
  69 {
  70         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
  71         u32 val;
  72         int timeout = 1000;
  73
  74         if (enable) {
  75                 usbhs_write32(priv, UGCTRL, 0); /* release PLLRESET */
  76                 usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 |
  77                               UGCTRL2_USB0SEL_HSUSB);
  78
  79                 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
  80                 do {
  81                         val = usbhs_read32(priv, UGSTS);
  82                         udelay(1);
  83                 } while (!(val & UGSTS_LOCK) && timeout--);
  84                 usbhs_write32(priv, UGCTRL, UGCTRL_CONNECT);
  85         } else {
  86                 usbhs_write32(priv, UGCTRL, 0);
  87                 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
  88                 usbhs_write32(priv, UGCTRL, UGCTRL_PLLRESET);
  89         }
  90
  91         return 0;
  92 }
  93
  94 static int usbhs_rcar3_get_id(struct platform_device *pdev)
  95 {
  96         return USBHS_GADGET;
  97 }
  98
  99 const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
 100         .power_ctrl = usbhs_rcar3_power_ctrl,
 101         .get_id = usbhs_rcar3_get_id,
 102 };
 103
 104 const struct renesas_usbhs_platform_callback usbhs_rcar3_with_pll_ops = {
 105         .power_ctrl = usbhs_rcar3_power_and_pll_ctrl,
 106         .get_id = usbhs_rcar3_get_id,
 107 };