arch/arm/mach-exynos/setup-usb-phy.c

   1 /*
   2  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   3  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/err.h>
  15 #include <linux/io.h>
  16 #include <linux/platform_device.h>
  17 #include <mach/regs-pmu.h>
  18 #include <mach/regs-usb-phy.h>
  19 #include <plat/cpu.h>
  20 #include <plat/usb-phy.h>
  21
  22 static atomic_t host_usage;
  23
  24 static int exynos4_usb_host_phy_is_on(void)
  25 {
  26         return (readl(EXYNOS4_PHYPWR) & PHY1_STD_ANALOG_POWERDOWN) ? 0 : 1;
  27 }
  28
  29 static void exynos4210_usb_phy_clkset(struct platform_device *pdev)
  30 {
  31         struct clk *xusbxti_clk;
  32         u32 phyclk;
  33
  34         xusbxti_clk = clk_get(&pdev->dev, "xusbxti");
  35         if (xusbxti_clk && !IS_ERR(xusbxti_clk)) {
  36                 if (soc_is_exynos4210()) {
  37                         /* set clock frequency for PLL */
  38                         phyclk = readl(EXYNOS4_PHYCLK) & ~EXYNOS4210_CLKSEL_MASK;
  39
  40                         switch (clk_get_rate(xusbxti_clk)) {
  41                         case 12 * MHZ:
  42                                 phyclk |= EXYNOS4210_CLKSEL_12M;
  43                                 break;
  44                         case 48 * MHZ:
  45                                 phyclk |= EXYNOS4210_CLKSEL_48M;
  46                                 break;
  47                         default:
  48                         case 24 * MHZ:
  49                                 phyclk |= EXYNOS4210_CLKSEL_24M;
  50                                 break;
  51                         }
  52                         writel(phyclk, EXYNOS4_PHYCLK);
  53                 } else if (soc_is_exynos4212() || soc_is_exynos4412()) {
  54                         /* set clock frequency for PLL */
  55                         phyclk = readl(EXYNOS4_PHYCLK) & ~EXYNOS4X12_CLKSEL_MASK;
  56
  57                         switch (clk_get_rate(xusbxti_clk)) {
  58                         case 9600 * KHZ:
  59                                 phyclk |= EXYNOS4X12_CLKSEL_9600K;
  60                                 break;
  61                         case 10 * MHZ:
  62                                 phyclk |= EXYNOS4X12_CLKSEL_10M;
  63                                 break;
  64                         case 12 * MHZ:
  65                                 phyclk |= EXYNOS4X12_CLKSEL_12M;
  66                                 break;
  67                         case 19200 * KHZ:
  68                                 phyclk |= EXYNOS4X12_CLKSEL_19200K;
  69                                 break;
  70                         case 20 * MHZ:
  71                                 phyclk |= EXYNOS4X12_CLKSEL_20M;
  72                                 break;
  73                         default:
  74                         case 24 * MHZ:
  75                                 /* default reference clock */
  76                                 phyclk |= EXYNOS4X12_CLKSEL_24M;
  77                                 break;
  78                         }
  79                         writel(phyclk, EXYNOS4_PHYCLK);
  80                 }
  81                 clk_put(xusbxti_clk);
  82         }
  83 }
  84
  85 static int exynos4210_usb_phy0_init(struct platform_device *pdev)
  86 {
  87         u32 rstcon;
  88
  89         writel(readl(S5P_USBDEVICE_PHY_CONTROL) | S5P_USBDEVICE_PHY_ENABLE,
  90                         S5P_USBDEVICE_PHY_CONTROL);
  91
  92         exynos4210_usb_phy_clkset(pdev);
  93
  94         /* set to normal PHY0 */
  95         writel((readl(EXYNOS4_PHYPWR) & ~PHY0_NORMAL_MASK), EXYNOS4_PHYPWR);
  96
  97         /* reset PHY0 and Link */
  98         rstcon = readl(EXYNOS4_RSTCON) | PHY0_SWRST_MASK;
  99         writel(rstcon, EXYNOS4_RSTCON);
 100         udelay(10);
 101
 102         rstcon &= ~PHY0_SWRST_MASK;
 103         writel(rstcon, EXYNOS4_RSTCON);
 104
 105         return 0;
 106 }
 107
 108 static int exynos4210_usb_phy0_exit(struct platform_device *pdev)
 109 {
 110         writel((readl(EXYNOS4_PHYPWR) | PHY0_ANALOG_POWERDOWN |
 111                                 PHY0_OTG_DISABLE), EXYNOS4_PHYPWR);
 112
 113         writel(readl(S5P_USBDEVICE_PHY_CONTROL) & ~S5P_USBDEVICE_PHY_ENABLE,
 114                         S5P_USBDEVICE_PHY_CONTROL);
 115
 116         return 0;
 117 }
 118
 119 static int exynos4210_usb_phy1_init(struct platform_device *pdev)
 120 {
 121         struct clk *otg_clk;
 122         u32 rstcon;
 123         int err;
 124
 125         atomic_inc(&host_usage);
 126
 127         otg_clk = clk_get(&pdev->dev, "otg");
 128         if (IS_ERR(otg_clk)) {
 129                 dev_err(&pdev->dev, "Failed to get otg clock\n");
 130                 return PTR_ERR(otg_clk);
 131         }
 132
 133         err = clk_enable(otg_clk);
 134         if (err) {
 135                 clk_put(otg_clk);
 136                 return err;
 137         }
 138
 139         if (exynos4_usb_host_phy_is_on())
 140                 return 0;
 141
 142         writel(readl(S5P_USBHOST_PHY_CONTROL) | S5P_USBHOST_PHY_ENABLE,
 143                         S5P_USBHOST_PHY_CONTROL);
 144
 145         exynos4210_usb_phy_clkset(pdev);
 146
 147         /* floating prevention logic: disable */
 148         writel((readl(EXYNOS4_PHY1CON) | FPENABLEN), EXYNOS4_PHY1CON);
 149
 150         /* set to normal HSIC 0 and 1 of PHY1 */
 151         writel((readl(EXYNOS4_PHYPWR) & ~PHY1_HSIC_NORMAL_MASK),
 152                         EXYNOS4_PHYPWR);
 153
 154         /* set to normal standard USB of PHY1 */
 155         writel((readl(EXYNOS4_PHYPWR) & ~PHY1_STD_NORMAL_MASK), EXYNOS4_PHYPWR);
 156
 157         /* reset all ports of both PHY and Link */
 158         rstcon = readl(EXYNOS4_RSTCON) | HOST_LINK_PORT_SWRST_MASK |
 159                 PHY1_SWRST_MASK;
 160         writel(rstcon, EXYNOS4_RSTCON);
 161         udelay(10);
 162
 163         rstcon &= ~(HOST_LINK_PORT_SWRST_MASK | PHY1_SWRST_MASK);
 164         writel(rstcon, EXYNOS4_RSTCON);
 165         udelay(80);
 166
 167         clk_disable(otg_clk);
 168         clk_put(otg_clk);
 169
 170         return 0;
 171 }
 172
 173 static int exynos4210_usb_phy1_exit(struct platform_device *pdev)
 174 {
 175         struct clk *otg_clk;
 176         int err;
 177
 178         if (atomic_dec_return(&host_usage) > 0)
 179                 return 0;
 180
 181         otg_clk = clk_get(&pdev->dev, "otg");
 182         if (IS_ERR(otg_clk)) {
 183                 dev_err(&pdev->dev, "Failed to get otg clock\n");
 184                 return PTR_ERR(otg_clk);
 185         }
 186
 187         err = clk_enable(otg_clk);
 188         if (err) {
 189                 clk_put(otg_clk);
 190                 return err;
 191         }
 192
 193         writel((readl(EXYNOS4_PHYPWR) | PHY1_STD_ANALOG_POWERDOWN),
 194                         EXYNOS4_PHYPWR);
 195
 196         writel(readl(S5P_USBHOST_PHY_CONTROL) & ~S5P_USBHOST_PHY_ENABLE,
 197                         S5P_USBHOST_PHY_CONTROL);
 198
 199         clk_disable(otg_clk);
 200         clk_put(otg_clk);
 201
 202         return 0;
 203 }
 204
 205 int s5p_usb_phy_init(struct platform_device *pdev, int type)
 206 {
 207         if (type == S5P_USB_PHY_DEVICE)
 208                 return exynos4210_usb_phy0_init(pdev);
 209         else if (type == S5P_USB_PHY_HOST)
 210                 return exynos4210_usb_phy1_init(pdev);
 211
 212         return -EINVAL;
 213 }
 214
 215 int s5p_usb_phy_exit(struct platform_device *pdev, int type)
 216 {
 217         if (type == S5P_USB_PHY_DEVICE)
 218                 return exynos4210_usb_phy0_exit(pdev);
 219         else if (type == S5P_USB_PHY_HOST)
 220                 return exynos4210_usb_phy1_exit(pdev);
 221
 222         return -EINVAL;
 223 }