drivers/phy/phy-exynos4210-usb2.c

   1 /*
   2  * Samsung SoC USB 1.1/2.0 PHY driver - Exynos 4210 support
   3  *
   4  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   5  * Author: 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 <linux/regmap.h>
  16 #include "phy-samsung-usb2.h"
  17
  18 /* Exynos USB PHY registers */
  19
  20 /* PHY power control */
  21 #define EXYNOS_4210_UPHYPWR                     0x0
  22
  23 #define EXYNOS_4210_UPHYPWR_PHY0_SUSPEND        BIT(0)
  24 #define EXYNOS_4210_UPHYPWR_PHY0_PWR            BIT(3)
  25 #define EXYNOS_4210_UPHYPWR_PHY0_OTG_PWR        BIT(4)
  26 #define EXYNOS_4210_UPHYPWR_PHY0_SLEEP          BIT(5)
  27 #define EXYNOS_4210_UPHYPWR_PHY0        ( \
  28         EXYNOS_4210_UPHYPWR_PHY0_SUSPEND | \
  29         EXYNOS_4210_UPHYPWR_PHY0_PWR | \
  30         EXYNOS_4210_UPHYPWR_PHY0_OTG_PWR | \
  31         EXYNOS_4210_UPHYPWR_PHY0_SLEEP)
  32
  33 #define EXYNOS_4210_UPHYPWR_PHY1_SUSPEND        BIT(6)
  34 #define EXYNOS_4210_UPHYPWR_PHY1_PWR            BIT(7)
  35 #define EXYNOS_4210_UPHYPWR_PHY1_SLEEP          BIT(8)
  36 #define EXYNOS_4210_UPHYPWR_PHY1 ( \
  37         EXYNOS_4210_UPHYPWR_PHY1_SUSPEND | \
  38         EXYNOS_4210_UPHYPWR_PHY1_PWR | \
  39         EXYNOS_4210_UPHYPWR_PHY1_SLEEP)
  40
  41 #define EXYNOS_4210_UPHYPWR_HSIC0_SUSPEND       BIT(9)
  42 #define EXYNOS_4210_UPHYPWR_HSIC0_SLEEP         BIT(10)
  43 #define EXYNOS_4210_UPHYPWR_HSIC0 ( \
  44         EXYNOS_4210_UPHYPWR_HSIC0_SUSPEND | \
  45         EXYNOS_4210_UPHYPWR_HSIC0_SLEEP)
  46
  47 #define EXYNOS_4210_UPHYPWR_HSIC1_SUSPEND       BIT(11)
  48 #define EXYNOS_4210_UPHYPWR_HSIC1_SLEEP         BIT(12)
  49 #define EXYNOS_4210_UPHYPWR_HSIC1 ( \
  50         EXYNOS_4210_UPHYPWR_HSIC1_SUSPEND | \
  51         EXYNOS_4210_UPHYPWR_HSIC1_SLEEP)
  52
  53 /* PHY clock control */
  54 #define EXYNOS_4210_UPHYCLK                     0x4
  55
  56 #define EXYNOS_4210_UPHYCLK_PHYFSEL_MASK        (0x3 << 0)
  57 #define EXYNOS_4210_UPHYCLK_PHYFSEL_OFFSET      0
  58 #define EXYNOS_4210_UPHYCLK_PHYFSEL_48MHZ       (0x0 << 0)
  59 #define EXYNOS_4210_UPHYCLK_PHYFSEL_24MHZ       (0x3 << 0)
  60 #define EXYNOS_4210_UPHYCLK_PHYFSEL_12MHZ       (0x2 << 0)
  61
  62 #define EXYNOS_4210_UPHYCLK_PHY0_ID_PULLUP      BIT(2)
  63 #define EXYNOS_4210_UPHYCLK_PHY0_COMMON_ON      BIT(4)
  64 #define EXYNOS_4210_UPHYCLK_PHY1_COMMON_ON      BIT(7)
  65
  66 /* PHY reset control */
  67 #define EXYNOS_4210_UPHYRST                     0x8
  68
  69 #define EXYNOS_4210_URSTCON_PHY0                BIT(0)
  70 #define EXYNOS_4210_URSTCON_OTG_HLINK           BIT(1)
  71 #define EXYNOS_4210_URSTCON_OTG_PHYLINK         BIT(2)
  72 #define EXYNOS_4210_URSTCON_PHY1_ALL            BIT(3)
  73 #define EXYNOS_4210_URSTCON_PHY1_P0             BIT(4)
  74 #define EXYNOS_4210_URSTCON_PHY1_P1P2           BIT(5)
  75 #define EXYNOS_4210_URSTCON_HOST_LINK_ALL       BIT(6)
  76 #define EXYNOS_4210_URSTCON_HOST_LINK_P0        BIT(7)
  77 #define EXYNOS_4210_URSTCON_HOST_LINK_P1        BIT(8)
  78 #define EXYNOS_4210_URSTCON_HOST_LINK_P2        BIT(9)
  79
  80 /* Isolation, configured in the power management unit */
  81 #define EXYNOS_4210_USB_ISOL_DEVICE_OFFSET      0x704
  82 #define EXYNOS_4210_USB_ISOL_DEVICE             BIT(0)
  83 #define EXYNOS_4210_USB_ISOL_HOST_OFFSET        0x708
  84 #define EXYNOS_4210_USB_ISOL_HOST               BIT(0)
  85
  86 /* USBYPHY1 Floating prevention */
  87 #define EXYNOS_4210_UPHY1CON                    0x34
  88 #define EXYNOS_4210_UPHY1CON_FLOAT_PREVENTION   0x1
  89
  90 /* Mode switching SUB Device <-> Host */
  91 #define EXYNOS_4210_MODE_SWITCH_OFFSET          0x21c
  92 #define EXYNOS_4210_MODE_SWITCH_MASK            1
  93 #define EXYNOS_4210_MODE_SWITCH_DEVICE          0
  94 #define EXYNOS_4210_MODE_SWITCH_HOST            1
  95
  96 enum exynos4210_phy_id {
  97         EXYNOS4210_DEVICE,
  98         EXYNOS4210_HOST,
  99         EXYNOS4210_HSIC0,
 100         EXYNOS4210_HSIC1,
 101         EXYNOS4210_NUM_PHYS,
 102 };
 103
 104 /*
 105  * exynos4210_rate_to_clk() converts the supplied clock rate to the value that
 106  * can be written to the phy register.
 107  */
 108 static int exynos4210_rate_to_clk(unsigned long rate, u32 *reg)
 109 {
 110         switch (rate) {
 111         case 12 * MHZ:
 112                 *reg = EXYNOS_4210_UPHYCLK_PHYFSEL_12MHZ;
 113                 break;
 114         case 24 * MHZ:
 115                 *reg = EXYNOS_4210_UPHYCLK_PHYFSEL_24MHZ;
 116                 break;
 117         case 48 * MHZ:
 118                 *reg = EXYNOS_4210_UPHYCLK_PHYFSEL_48MHZ;
 119                 break;
 120         default:
 121                 return -EINVAL;
 122         }
 123
 124         return 0;
 125 }
 126
 127 static void exynos4210_isol(struct samsung_usb2_phy_instance *inst, bool on)
 128 {
 129         struct samsung_usb2_phy_driver *drv = inst->drv;
 130         u32 offset;
 131         u32 mask;
 132
 133         switch (inst->cfg->id) {
 134         case EXYNOS4210_DEVICE:
 135                 offset = EXYNOS_4210_USB_ISOL_DEVICE_OFFSET;
 136                 mask = EXYNOS_4210_USB_ISOL_DEVICE;
 137                 break;
 138         case EXYNOS4210_HOST:
 139                 offset = EXYNOS_4210_USB_ISOL_HOST_OFFSET;
 140                 mask = EXYNOS_4210_USB_ISOL_HOST;
 141                 break;
 142         default:
 143                 return;
 144         }
 145
 146         regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 : mask);
 147 }
 148
 149 static void exynos4210_phy_pwr(struct samsung_usb2_phy_instance *inst, bool on)
 150 {
 151         struct samsung_usb2_phy_driver *drv = inst->drv;
 152         u32 rstbits = 0;
 153         u32 phypwr = 0;
 154         u32 rst;
 155         u32 pwr;
 156         u32 clk;
 157
 158         switch (inst->cfg->id) {
 159         case EXYNOS4210_DEVICE:
 160                 phypwr =        EXYNOS_4210_UPHYPWR_PHY0;
 161                 rstbits =       EXYNOS_4210_URSTCON_PHY0;
 162                 break;
 163         case EXYNOS4210_HOST:
 164                 phypwr =        EXYNOS_4210_UPHYPWR_PHY1;
 165                 rstbits =       EXYNOS_4210_URSTCON_PHY1_ALL |
 166                                 EXYNOS_4210_URSTCON_PHY1_P0 |
 167                                 EXYNOS_4210_URSTCON_PHY1_P1P2 |
 168                                 EXYNOS_4210_URSTCON_HOST_LINK_ALL |
 169                                 EXYNOS_4210_URSTCON_HOST_LINK_P0;
 170                 writel(on, drv->reg_phy + EXYNOS_4210_UPHY1CON);
 171                 break;
 172         case EXYNOS4210_HSIC0:
 173                 phypwr =        EXYNOS_4210_UPHYPWR_HSIC0;
 174                 rstbits =       EXYNOS_4210_URSTCON_PHY1_P1P2 |
 175                                 EXYNOS_4210_URSTCON_HOST_LINK_P1;
 176                 break;
 177         case EXYNOS4210_HSIC1:
 178                 phypwr =        EXYNOS_4210_UPHYPWR_HSIC1;
 179                 rstbits =       EXYNOS_4210_URSTCON_PHY1_P1P2 |
 180                                 EXYNOS_4210_URSTCON_HOST_LINK_P2;
 181                 break;
 182         }
 183
 184         if (on) {
 185                 clk = readl(drv->reg_phy + EXYNOS_4210_UPHYCLK);
 186                 clk &= ~EXYNOS_4210_UPHYCLK_PHYFSEL_MASK;
 187                 clk |= drv->ref_reg_val << EXYNOS_4210_UPHYCLK_PHYFSEL_OFFSET;
 188                 writel(clk, drv->reg_phy + EXYNOS_4210_UPHYCLK);
 189
 190                 pwr = readl(drv->reg_phy + EXYNOS_4210_UPHYPWR);
 191                 pwr &= ~phypwr;
 192                 writel(pwr, drv->reg_phy + EXYNOS_4210_UPHYPWR);
 193
 194                 rst = readl(drv->reg_phy + EXYNOS_4210_UPHYRST);
 195                 rst |= rstbits;
 196                 writel(rst, drv->reg_phy + EXYNOS_4210_UPHYRST);
 197                 udelay(10);
 198                 rst &= ~rstbits;
 199                 writel(rst, drv->reg_phy + EXYNOS_4210_UPHYRST);
 200                 /* The following delay is necessary for the reset sequence to be
 201                  * completed */
 202                 udelay(80);
 203         } else {
 204                 pwr = readl(drv->reg_phy + EXYNOS_4210_UPHYPWR);
 205                 pwr |= phypwr;
 206                 writel(pwr, drv->reg_phy + EXYNOS_4210_UPHYPWR);
 207         }
 208 }
 209
 210 static int exynos4210_power_on(struct samsung_usb2_phy_instance *inst)
 211 {
 212         /* Order of initialisation is important - first power then isolation */
 213         exynos4210_phy_pwr(inst, 1);
 214         exynos4210_isol(inst, 0);
 215
 216         return 0;
 217 }
 218
 219 static int exynos4210_power_off(struct samsung_usb2_phy_instance *inst)
 220 {
 221         exynos4210_isol(inst, 1);
 222         exynos4210_phy_pwr(inst, 0);
 223
 224         return 0;
 225 }
 226
 227
 228 static const struct samsung_usb2_common_phy exynos4210_phys[] = {
 229         {
 230                 .label          = "device",
 231                 .id             = EXYNOS4210_DEVICE,
 232                 .power_on       = exynos4210_power_on,
 233                 .power_off      = exynos4210_power_off,
 234         },
 235         {
 236                 .label          = "host",
 237                 .id             = EXYNOS4210_HOST,
 238                 .power_on       = exynos4210_power_on,
 239                 .power_off      = exynos4210_power_off,
 240         },
 241         {
 242                 .label          = "hsic0",
 243                 .id             = EXYNOS4210_HSIC0,
 244                 .power_on       = exynos4210_power_on,
 245                 .power_off      = exynos4210_power_off,
 246         },
 247         {
 248                 .label          = "hsic1",
 249                 .id             = EXYNOS4210_HSIC1,
 250                 .power_on       = exynos4210_power_on,
 251                 .power_off      = exynos4210_power_off,
 252         },
 253 };
 254
 255 const struct samsung_usb2_phy_config exynos4210_usb2_phy_config = {
 256         .has_mode_switch        = 0,
 257         .num_phys               = EXYNOS4210_NUM_PHYS,
 258         .phys                   = exynos4210_phys,
 259         .rate_to_clk            = exynos4210_rate_to_clk,
 260 };