drivers/phy/phy-s5pv210-usb2.c

   1 /*
   2  * Samsung SoC USB 1.1/2.0 PHY driver - S5PV210 support
   3  *
   4  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   5  * Authors: Kamil Debski <k.debski@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/io.h>
  14 #include <linux/phy/phy.h>
  15 #include "phy-samsung-usb2.h"
  16
  17 /* Exynos USB PHY registers */
  18
  19 /* PHY power control */
  20 #define S5PV210_UPHYPWR                 0x0
  21
  22 #define S5PV210_UPHYPWR_PHY0_SUSPEND    BIT(0)
  23 #define S5PV210_UPHYPWR_PHY0_PWR        BIT(3)
  24 #define S5PV210_UPHYPWR_PHY0_OTG_PWR    BIT(4)
  25 #define S5PV210_UPHYPWR_PHY0    ( \
  26         S5PV210_UPHYPWR_PHY0_SUSPEND | \
  27         S5PV210_UPHYPWR_PHY0_PWR | \
  28         S5PV210_UPHYPWR_PHY0_OTG_PWR)
  29
  30 #define S5PV210_UPHYPWR_PHY1_SUSPEND    BIT(6)
  31 #define S5PV210_UPHYPWR_PHY1_PWR        BIT(7)
  32 #define S5PV210_UPHYPWR_PHY1 ( \
  33         S5PV210_UPHYPWR_PHY1_SUSPEND | \
  34         S5PV210_UPHYPWR_PHY1_PWR)
  35
  36 /* PHY clock control */
  37 #define S5PV210_UPHYCLK                 0x4
  38
  39 #define S5PV210_UPHYCLK_PHYFSEL_MASK    (0x3 << 0)
  40 #define S5PV210_UPHYCLK_PHYFSEL_48MHZ   (0x0 << 0)
  41 #define S5PV210_UPHYCLK_PHYFSEL_24MHZ   (0x3 << 0)
  42 #define S5PV210_UPHYCLK_PHYFSEL_12MHZ   (0x2 << 0)
  43
  44 #define S5PV210_UPHYCLK_PHY0_ID_PULLUP  BIT(2)
  45 #define S5PV210_UPHYCLK_PHY0_COMMON_ON  BIT(4)
  46 #define S5PV210_UPHYCLK_PHY1_COMMON_ON  BIT(7)
  47
  48 /* PHY reset control */
  49 #define S5PV210_UPHYRST                 0x8
  50
  51 #define S5PV210_URSTCON_PHY0            BIT(0)
  52 #define S5PV210_URSTCON_OTG_HLINK       BIT(1)
  53 #define S5PV210_URSTCON_OTG_PHYLINK     BIT(2)
  54 #define S5PV210_URSTCON_PHY1_ALL        BIT(3)
  55 #define S5PV210_URSTCON_HOST_LINK_ALL   BIT(4)
  56
  57 /* Isolation, configured in the power management unit */
  58 #define S5PV210_USB_ISOL_OFFSET         0x680c
  59 #define S5PV210_USB_ISOL_DEVICE         BIT(0)
  60 #define S5PV210_USB_ISOL_HOST           BIT(1)
  61
  62
  63 enum s5pv210_phy_id {
  64         S5PV210_DEVICE,
  65         S5PV210_HOST,
  66         S5PV210_NUM_PHYS,
  67 };
  68
  69 /*
  70  * s5pv210_rate_to_clk() converts the supplied clock rate to the value that
  71  * can be written to the phy register.
  72  */
  73 static int s5pv210_rate_to_clk(unsigned long rate, u32 *reg)
  74 {
  75         switch (rate) {
  76         case 12 * MHZ:
  77                 *reg = S5PV210_UPHYCLK_PHYFSEL_12MHZ;
  78                 break;
  79         case 24 * MHZ:
  80                 *reg = S5PV210_UPHYCLK_PHYFSEL_24MHZ;
  81                 break;
  82         case 48 * MHZ:
  83                 *reg = S5PV210_UPHYCLK_PHYFSEL_48MHZ;
  84                 break;
  85         default:
  86                 return -EINVAL;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static void s5pv210_isol(struct samsung_usb2_phy_instance *inst, bool on)
  93 {
  94         struct samsung_usb2_phy_driver *drv = inst->drv;
  95         u32 mask;
  96
  97         switch (inst->cfg->id) {
  98         case S5PV210_DEVICE:
  99                 mask = S5PV210_USB_ISOL_DEVICE;
 100                 break;
 101         case S5PV210_HOST:
 102                 mask = S5PV210_USB_ISOL_HOST;
 103                 break;
 104         default:
 105                 return;
 106         };
 107
 108         regmap_update_bits(drv->reg_pmu, S5PV210_USB_ISOL_OFFSET,
 109                                                         mask, on ? 0 : mask);
 110 }
 111
 112 static void s5pv210_phy_pwr(struct samsung_usb2_phy_instance *inst, bool on)
 113 {
 114         struct samsung_usb2_phy_driver *drv = inst->drv;
 115         u32 rstbits = 0;
 116         u32 phypwr = 0;
 117         u32 rst;
 118         u32 pwr;
 119
 120         switch (inst->cfg->id) {
 121         case S5PV210_DEVICE:
 122                 phypwr =        S5PV210_UPHYPWR_PHY0;
 123                 rstbits =       S5PV210_URSTCON_PHY0;
 124                 break;
 125         case S5PV210_HOST:
 126                 phypwr =        S5PV210_UPHYPWR_PHY1;
 127                 rstbits =       S5PV210_URSTCON_PHY1_ALL |
 128                                 S5PV210_URSTCON_HOST_LINK_ALL;
 129                 break;
 130         };
 131
 132         if (on) {
 133                 writel(drv->ref_reg_val, drv->reg_phy + S5PV210_UPHYCLK);
 134
 135                 pwr = readl(drv->reg_phy + S5PV210_UPHYPWR);
 136                 pwr &= ~phypwr;
 137                 writel(pwr, drv->reg_phy + S5PV210_UPHYPWR);
 138
 139                 rst = readl(drv->reg_phy + S5PV210_UPHYRST);
 140                 rst |= rstbits;
 141                 writel(rst, drv->reg_phy + S5PV210_UPHYRST);
 142                 udelay(10);
 143                 rst &= ~rstbits;
 144                 writel(rst, drv->reg_phy + S5PV210_UPHYRST);
 145                 /* The following delay is necessary for the reset sequence to be
 146                  * completed
 147                  */
 148                 udelay(80);
 149         } else {
 150                 pwr = readl(drv->reg_phy + S5PV210_UPHYPWR);
 151                 pwr |= phypwr;
 152                 writel(pwr, drv->reg_phy + S5PV210_UPHYPWR);
 153         }
 154 }
 155
 156 static int s5pv210_power_on(struct samsung_usb2_phy_instance *inst)
 157 {
 158         s5pv210_isol(inst, 0);
 159         s5pv210_phy_pwr(inst, 1);
 160
 161         return 0;
 162 }
 163
 164 static int s5pv210_power_off(struct samsung_usb2_phy_instance *inst)
 165 {
 166         s5pv210_phy_pwr(inst, 0);
 167         s5pv210_isol(inst, 1);
 168
 169         return 0;
 170 }
 171
 172 static const struct samsung_usb2_common_phy s5pv210_phys[S5PV210_NUM_PHYS] = {
 173         [S5PV210_DEVICE] = {
 174                 .label          = "device",
 175                 .id             = S5PV210_DEVICE,
 176                 .power_on       = s5pv210_power_on,
 177                 .power_off      = s5pv210_power_off,
 178         },
 179         [S5PV210_HOST] = {
 180                 .label          = "host",
 181                 .id             = S5PV210_HOST,
 182                 .power_on       = s5pv210_power_on,
 183                 .power_off      = s5pv210_power_off,
 184         },
 185 };
 186
 187 const struct samsung_usb2_phy_config s5pv210_usb2_phy_config = {
 188         .num_phys       = ARRAY_SIZE(s5pv210_phys),
 189         .phys           = s5pv210_phys,
 190         .rate_to_clk    = s5pv210_rate_to_clk,
 191 };