drivers/phy/meson-gxl-usb2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Meson GXL and GXM USB2 PHY driver
   4  *
   5  * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   6  * Copyright (C) 2018 BayLibre, SAS
   7  * Author: Neil Armstrong <narmstron@baylibre.com>
   8  */
   9
  10 #include <common.h>
  11 #include <malloc.h>
  12 #include <asm/io.h>
  13 #include <bitfield.h>
  14 #include <dm.h>
  15 #include <errno.h>
  16 #include <generic-phy.h>
  17 #include <regmap.h>
  18 #include <power/regulator.h>
  19 #include <clk.h>
  20
  21 #include <linux/bitops.h>
  22 #include <linux/compat.h>
  23
  24 /* bits [31:27] are read-only */
  25 #define U2P_R0                                                  0x0
  26         #define U2P_R0_BYPASS_SEL                               BIT(0)
  27         #define U2P_R0_BYPASS_DM_EN                             BIT(1)
  28         #define U2P_R0_BYPASS_DP_EN                             BIT(2)
  29         #define U2P_R0_TXBITSTUFF_ENH                           BIT(3)
  30         #define U2P_R0_TXBITSTUFF_EN                            BIT(4)
  31         #define U2P_R0_DM_PULLDOWN                              BIT(5)
  32         #define U2P_R0_DP_PULLDOWN                              BIT(6)
  33         #define U2P_R0_DP_VBUS_VLD_EXT_SEL                      BIT(7)
  34         #define U2P_R0_DP_VBUS_VLD_EXT                          BIT(8)
  35         #define U2P_R0_ADP_PRB_EN                               BIT(9)
  36         #define U2P_R0_ADP_DISCHARGE                            BIT(10)
  37         #define U2P_R0_ADP_CHARGE                               BIT(11)
  38         #define U2P_R0_DRV_VBUS                                 BIT(12)
  39         #define U2P_R0_ID_PULLUP                                BIT(13)
  40         #define U2P_R0_LOOPBACK_EN_B                            BIT(14)
  41         #define U2P_R0_OTG_DISABLE                              BIT(15)
  42         #define U2P_R0_COMMON_ONN                               BIT(16)
  43         #define U2P_R0_FSEL_MASK                                GENMASK(19, 17)
  44         #define U2P_R0_REF_CLK_SEL_MASK                         GENMASK(21, 20)
  45         #define U2P_R0_POWER_ON_RESET                           BIT(22)
  46         #define U2P_R0_V_ATE_TEST_EN_B_MASK                     GENMASK(24, 23)
  47         #define U2P_R0_ID_SET_ID_DQ                             BIT(25)
  48         #define U2P_R0_ATE_RESET                                BIT(26)
  49         #define U2P_R0_FSV_MINUS                                BIT(27)
  50         #define U2P_R0_FSV_PLUS                                 BIT(28)
  51         #define U2P_R0_BYPASS_DM_DATA                           BIT(29)
  52         #define U2P_R0_BYPASS_DP_DATA                           BIT(30)
  53
  54 #define U2P_R1                                                  0x4
  55         #define U2P_R1_BURN_IN_TEST                             BIT(0)
  56         #define U2P_R1_ACA_ENABLE                               BIT(1)
  57         #define U2P_R1_DCD_ENABLE                               BIT(2)
  58         #define U2P_R1_VDAT_SRC_EN_B                            BIT(3)
  59         #define U2P_R1_VDAT_DET_EN_B                            BIT(4)
  60         #define U2P_R1_CHARGES_SEL                              BIT(5)
  61         #define U2P_R1_TX_PREEMP_PULSE_TUNE                     BIT(6)
  62         #define U2P_R1_TX_PREEMP_AMP_TUNE_MASK                  GENMASK(8, 7)
  63         #define U2P_R1_TX_RES_TUNE_MASK                         GENMASK(10, 9)
  64         #define U2P_R1_TX_RISE_TUNE_MASK                        GENMASK(12, 11)
  65         #define U2P_R1_TX_VREF_TUNE_MASK                        GENMASK(16, 13)
  66         #define U2P_R1_TX_FSLS_TUNE_MASK                        GENMASK(20, 17)
  67         #define U2P_R1_TX_HSXV_TUNE_MASK                        GENMASK(22, 21)
  68         #define U2P_R1_OTG_TUNE_MASK                            GENMASK(25, 23)
  69         #define U2P_R1_SQRX_TUNE_MASK                           GENMASK(28, 26)
  70         #define U2P_R1_COMP_DIS_TUNE_MASK                       GENMASK(31, 29)
  71
  72 /* bits [31:14] are read-only */
  73 #define U2P_R2                                                  0x8
  74         #define U2P_R2_TESTDATA_IN_MASK                         GENMASK(7, 0)
  75         #define U2P_R2_TESTADDR_MASK                            GENMASK(11, 8)
  76         #define U2P_R2_TESTDATA_OUT_SEL                         BIT(12)
  77         #define U2P_R2_TESTCLK                                  BIT(13)
  78         #define U2P_R2_TESTDATA_OUT_MASK                        GENMASK(17, 14)
  79         #define U2P_R2_ACA_PIN_RANGE_C                          BIT(18)
  80         #define U2P_R2_ACA_PIN_RANGE_B                          BIT(19)
  81         #define U2P_R2_ACA_PIN_RANGE_A                          BIT(20)
  82         #define U2P_R2_ACA_PIN_GND                              BIT(21)
  83         #define U2P_R2_ACA_PIN_FLOAT                            BIT(22)
  84         #define U2P_R2_CHARGE_DETECT                            BIT(23)
  85         #define U2P_R2_DEVICE_SESSION_VALID                     BIT(24)
  86         #define U2P_R2_ADP_PROBE                                BIT(25)
  87         #define U2P_R2_ADP_SENSE                                BIT(26)
  88         #define U2P_R2_SESSION_END                              BIT(27)
  89         #define U2P_R2_VBUS_VALID                               BIT(28)
  90         #define U2P_R2_B_VALID                                  BIT(29)
  91         #define U2P_R2_A_VALID                                  BIT(30)
  92         #define U2P_R2_ID_DIG                                   BIT(31)
  93
  94 #define U2P_R3                                                  0xc
  95
  96 #define RESET_COMPLETE_TIME                             500
  97
  98 struct phy_meson_gxl_usb2_priv {
  99         struct regmap           *regmap;
 100 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 101         struct udevice          *phy_supply;
 102 #endif
 103 #if CONFIG_IS_ENABLED(CLK)
 104         struct clk              clk;
 105 #endif
 106 };
 107
 108 static void phy_meson_gxl_usb2_reset(struct phy_meson_gxl_usb2_priv *priv)
 109 {
 110         uint val;
 111
 112         regmap_read(priv->regmap, U2P_R0, &val);
 113
 114         /* reset the PHY and wait until settings are stabilized */
 115         val |= U2P_R0_POWER_ON_RESET;
 116         regmap_write(priv->regmap, U2P_R0, val);
 117         udelay(RESET_COMPLETE_TIME);
 118
 119         val &= ~U2P_R0_POWER_ON_RESET;
 120         regmap_write(priv->regmap, U2P_R0, val);
 121         udelay(RESET_COMPLETE_TIME);
 122 }
 123
 124 static void
 125 phy_meson_gxl_usb2_set_host_mode(struct phy_meson_gxl_usb2_priv *priv)
 126 {
 127         uint val;
 128
 129         regmap_read(priv->regmap, U2P_R0, &val);
 130         val |= U2P_R0_DM_PULLDOWN;
 131         val |= U2P_R0_DP_PULLDOWN;
 132         val &= ~U2P_R0_ID_PULLUP;
 133         regmap_write(priv->regmap, U2P_R0, val);
 134
 135         phy_meson_gxl_usb2_reset(priv);
 136 }
 137
 138 static int phy_meson_gxl_usb2_power_on(struct phy *phy)
 139 {
 140         struct udevice *dev = phy->dev;
 141         struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
 142         uint val;
 143
 144         regmap_read(priv->regmap, U2P_R0, &val);
 145         /* power on the PHY by taking it out of reset mode */
 146         val &= ~U2P_R0_POWER_ON_RESET;
 147         regmap_write(priv->regmap, U2P_R0, val);
 148
 149         phy_meson_gxl_usb2_set_host_mode(priv);
 150
 151 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 152         if (priv->phy_supply) {
 153                 int ret = regulator_set_enable(priv->phy_supply, true);
 154                 if (ret)
 155                         return ret;
 156         }
 157 #endif
 158
 159         return 0;
 160 }
 161
 162 static int phy_meson_gxl_usb2_power_off(struct phy *phy)
 163 {
 164         struct udevice *dev = phy->dev;
 165         struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
 166         uint val;
 167
 168         regmap_read(priv->regmap, U2P_R0, &val);
 169         /* power off the PHY by putting it into reset mode */
 170         val |= U2P_R0_POWER_ON_RESET;
 171         regmap_write(priv->regmap, U2P_R0, val);
 172
 173 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 174         if (priv->phy_supply) {
 175                 int ret = regulator_set_enable(priv->phy_supply, false);
 176                 if (ret) {
 177                         pr_err("Error disabling PHY supply\n");
 178                         return ret;
 179                 }
 180         }
 181 #endif
 182
 183         return 0;
 184 }
 185
 186 struct phy_ops meson_gxl_usb2_phy_ops = {
 187         .power_on = phy_meson_gxl_usb2_power_on,
 188         .power_off = phy_meson_gxl_usb2_power_off,
 189 };
 190
 191 int meson_gxl_usb2_phy_probe(struct udevice *dev)
 192 {
 193         struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
 194         int ret;
 195
 196         ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
 197         if (ret)
 198                 return ret;
 199
 200 #if CONFIG_IS_ENABLED(CLK)
 201         ret = clk_get_by_index(dev, 0, &priv->clk);
 202         if (ret < 0)
 203                 return ret;
 204
 205         ret = clk_enable(&priv->clk);
 206         if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
 207                 pr_err("failed to enable PHY clock\n");
 208                 clk_free(&priv->clk);
 209                 return ret;
 210         }
 211 #endif
 212
 213 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 214         ret = device_get_supply_regulator(dev, "phy-supply", &priv->phy_supply);
 215         if (ret && ret != -ENOENT) {
 216                 pr_err("Failed to get PHY regulator\n");
 217                 return ret;
 218         }
 219 #endif
 220
 221         return 0;
 222 }
 223
 224 static const struct udevice_id meson_gxl_usb2_phy_ids[] = {
 225         { .compatible = "amlogic,meson-gxl-usb2-phy" },
 226         { }
 227 };
 228
 229 U_BOOT_DRIVER(meson_gxl_usb2_phy) = {
 230         .name = "meson_gxl_usb2_phy",
 231         .id = UCLASS_PHY,
 232         .of_match = meson_gxl_usb2_phy_ids,
 233         .probe = meson_gxl_usb2_phy_probe,
 234         .ops = &meson_gxl_usb2_phy_ops,
 235         .priv_auto_alloc_size = sizeof(struct phy_meson_gxl_usb2_priv),
 236 };