drivers/phy/meson-g12a-usb2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Meson G12A USB2 PHY driver
   4  *
   5  * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   6  * Copyright (C) 2019 BayLibre, SAS
   7  * Author: Neil Armstrong <narmstron@baylibre.com>
   8  */
   9
  10 #include <common.h>
  11 #include <log.h>
  12 #include <malloc.h>
  13 #include <asm/io.h>
  14 #include <bitfield.h>
  15 #include <dm.h>
  16 #include <errno.h>
  17 #include <generic-phy.h>
  18 #include <regmap.h>
  19 #include <linux/delay.h>
  20 #include <power/regulator.h>
  21 #include <reset.h>
  22 #include <clk.h>
  23
  24 #include <linux/bitops.h>
  25 #include <linux/compat.h>
  26
  27 #define PHY_CTRL_R0                                             0x0
  28 #define PHY_CTRL_R1                                             0x4
  29 #define PHY_CTRL_R2                                             0x8
  30 #define PHY_CTRL_R3                                             0xc
  31 #define PHY_CTRL_R4                                             0x10
  32 #define PHY_CTRL_R5                                             0x14
  33 #define PHY_CTRL_R6                                             0x18
  34 #define PHY_CTRL_R7                                             0x1c
  35 #define PHY_CTRL_R8                                             0x20
  36 #define PHY_CTRL_R9                                             0x24
  37 #define PHY_CTRL_R10                                            0x28
  38 #define PHY_CTRL_R11                                            0x2c
  39 #define PHY_CTRL_R12                                            0x30
  40 #define PHY_CTRL_R13                                            0x34
  41 #define PHY_CTRL_R14                                            0x38
  42 #define PHY_CTRL_R15                                            0x3c
  43 #define PHY_CTRL_R16                                            0x40
  44 #define PHY_CTRL_R17                                            0x44
  45 #define PHY_CTRL_R18                                            0x48
  46 #define PHY_CTRL_R19                                            0x4c
  47 #define PHY_CTRL_R20                                            0x50
  48 #define PHY_CTRL_R21                                            0x54
  49 #define PHY_CTRL_R22                                            0x58
  50 #define PHY_CTRL_R23                                            0x5c
  51
  52 #define RESET_COMPLETE_TIME                                     1000
  53 #define PLL_RESET_COMPLETE_TIME                                 100
  54
  55 struct phy_meson_g12a_usb2_priv {
  56         struct regmap           *regmap;
  57 #if CONFIG_IS_ENABLED(DM_REGULATOR)
  58         struct udevice          *phy_supply;
  59 #endif
  60 #if CONFIG_IS_ENABLED(CLK)
  61         struct clk              clk;
  62 #endif
  63         struct reset_ctl        reset;
  64 };
  65
  66
  67 static int phy_meson_g12a_usb2_power_on(struct phy *phy)
  68 {
  69 #if CONFIG_IS_ENABLED(DM_REGULATOR)
  70         struct udevice *dev = phy->dev;
  71         struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
  72
  73         if (priv->phy_supply) {
  74                 int ret = regulator_set_enable(priv->phy_supply, true);
  75                 if (ret)
  76                         return ret;
  77         }
  78 #endif
  79
  80         return 0;
  81 }
  82
  83 static int phy_meson_g12a_usb2_power_off(struct phy *phy)
  84 {
  85 #if CONFIG_IS_ENABLED(DM_REGULATOR)
  86         struct udevice *dev = phy->dev;
  87         struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
  88
  89         if (priv->phy_supply) {
  90                 int ret = regulator_set_enable(priv->phy_supply, false);
  91                 if (ret) {
  92                         pr_err("Error disabling PHY supply\n");
  93                         return ret;
  94                 }
  95         }
  96 #endif
  97
  98         return 0;
  99 }
 100
 101 static int phy_meson_g12a_usb2_init(struct phy *phy)
 102 {
 103         struct udevice *dev = phy->dev;
 104         struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
 105         int ret;
 106
 107         ret = reset_assert(&priv->reset);
 108         udelay(1);
 109         ret |= reset_deassert(&priv->reset);
 110         if (ret)
 111                 return ret;
 112
 113         udelay(RESET_COMPLETE_TIME);
 114
 115         /* usb2_otg_aca_en == 0 */
 116         regmap_update_bits(priv->regmap, PHY_CTRL_R21, BIT(2), 0);
 117
 118         /* PLL Setup : 24MHz * 20 / 1 = 480MHz */
 119         regmap_write(priv->regmap, PHY_CTRL_R16, 0x39400414);
 120         regmap_write(priv->regmap, PHY_CTRL_R17, 0x927e0000);
 121         regmap_write(priv->regmap, PHY_CTRL_R18, 0xac5f49e5);
 122
 123         udelay(PLL_RESET_COMPLETE_TIME);
 124
 125         /* UnReset PLL */
 126         regmap_write(priv->regmap, PHY_CTRL_R16, 0x19400414);
 127
 128         /* PHY Tuning */
 129         regmap_write(priv->regmap, PHY_CTRL_R20, 0xfe18);
 130         regmap_write(priv->regmap, PHY_CTRL_R4, 0x8000fff);
 131
 132         /* Tuning Disconnect Threshold */
 133         regmap_write(priv->regmap, PHY_CTRL_R3, 0x34);
 134
 135         /* Analog Settings */
 136         regmap_write(priv->regmap, PHY_CTRL_R14, 0);
 137         regmap_write(priv->regmap, PHY_CTRL_R13, 0x78000);
 138
 139         return 0;
 140 }
 141
 142 static int phy_meson_g12a_usb2_exit(struct phy *phy)
 143 {
 144         struct udevice *dev = phy->dev;
 145         struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
 146         int ret;
 147
 148         ret = reset_assert(&priv->reset);
 149         if (ret)
 150                 return ret;
 151
 152         return 0;
 153 }
 154
 155 struct phy_ops meson_g12a_usb2_phy_ops = {
 156         .init = phy_meson_g12a_usb2_init,
 157         .exit = phy_meson_g12a_usb2_exit,
 158         .power_on = phy_meson_g12a_usb2_power_on,
 159         .power_off = phy_meson_g12a_usb2_power_off,
 160 };
 161
 162 int meson_g12a_usb2_phy_probe(struct udevice *dev)
 163 {
 164         struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev);
 165         int ret;
 166
 167         ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
 168         if (ret)
 169                 return ret;
 170
 171         ret = reset_get_by_index(dev, 0, &priv->reset);
 172         if (ret == -ENOTSUPP)
 173                 return 0;
 174         else if (ret)
 175                 return ret;
 176
 177         ret = reset_deassert(&priv->reset);
 178         if (ret) {
 179                 reset_release_all(&priv->reset, 1);
 180                 return ret;
 181         }
 182
 183 #if CONFIG_IS_ENABLED(CLK)
 184         ret = clk_get_by_index(dev, 0, &priv->clk);
 185         if (ret < 0)
 186                 return ret;
 187
 188         ret = clk_enable(&priv->clk);
 189         if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
 190                 pr_err("failed to enable PHY clock\n");
 191                 clk_free(&priv->clk);
 192                 return ret;
 193         }
 194 #endif
 195
 196 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 197         ret = device_get_supply_regulator(dev, "phy-supply", &priv->phy_supply);
 198         if (ret && ret != -ENOENT) {
 199                 pr_err("Failed to get PHY regulator\n");
 200                 return ret;
 201         }
 202 #endif
 203
 204         return 0;
 205 }
 206
 207 static const struct udevice_id meson_g12a_usb2_phy_ids[] = {
 208         { .compatible = "amlogic,g12a-usb2-phy" },
 209         { }
 210 };
 211
 212 U_BOOT_DRIVER(meson_g12a_usb2_phy) = {
 213         .name = "meson_g12a_usb2_phy",
 214         .id = UCLASS_PHY,
 215         .of_match = meson_g12a_usb2_phy_ids,
 216         .probe = meson_g12a_usb2_phy_probe,
 217         .ops = &meson_g12a_usb2_phy_ops,
 218         .priv_auto      = sizeof(struct phy_meson_g12a_usb2_priv),
 219 };