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