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 <[email protected]>
   6  * Copyright (C) 2018 BayLibre, SAS
   7  * Author: Neil Armstrong <[email protected]>
   8  */
   9
  10 #include <common.h>
  11 #include <malloc.h>
  12 #include <asm/io.h>
  13 #include <bitfield.h>
  14 #include <clk.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 <linux/printk.h>
  21 #include <linux/usb/otg.h>
  22
  23 #include <asm/arch/usb-gx.h>
  24
  25 #include <linux/bitops.h>
  26 #include <linux/compat.h>
  27
  28 /* bits [31:27] are read-only */
  29 #define U2P_R0                                                  0x0
  30         #define U2P_R0_BYPASS_SEL                               BIT(0)
  31         #define U2P_R0_BYPASS_DM_EN                             BIT(1)
  32         #define U2P_R0_BYPASS_DP_EN                             BIT(2)
  33         #define U2P_R0_TXBITSTUFF_ENH                           BIT(3)
  34         #define U2P_R0_TXBITSTUFF_EN                            BIT(4)
  35         #define U2P_R0_DM_PULLDOWN                              BIT(5)
  36         #define U2P_R0_DP_PULLDOWN                              BIT(6)
  37         #define U2P_R0_DP_VBUS_VLD_EXT_SEL                      BIT(7)
  38         #define U2P_R0_DP_VBUS_VLD_EXT                          BIT(8)
  39         #define U2P_R0_ADP_PRB_EN                               BIT(9)
  40         #define U2P_R0_ADP_DISCHARGE                            BIT(10)
  41         #define U2P_R0_ADP_CHARGE                               BIT(11)
  42         #define U2P_R0_DRV_VBUS                                 BIT(12)
  43         #define U2P_R0_ID_PULLUP                                BIT(13)
  44         #define U2P_R0_LOOPBACK_EN_B                            BIT(14)
  45         #define U2P_R0_OTG_DISABLE                              BIT(15)
  46         #define U2P_R0_COMMON_ONN                               BIT(16)
  47         #define U2P_R0_FSEL_MASK                                GENMASK(19, 17)
  48         #define U2P_R0_REF_CLK_SEL_MASK                         GENMASK(21, 20)
  49         #define U2P_R0_POWER_ON_RESET                           BIT(22)
  50         #define U2P_R0_V_ATE_TEST_EN_B_MASK                     GENMASK(24, 23)
  51         #define U2P_R0_ID_SET_ID_DQ                             BIT(25)
  52         #define U2P_R0_ATE_RESET                                BIT(26)
  53         #define U2P_R0_FSV_MINUS                                BIT(27)
  54         #define U2P_R0_FSV_PLUS                                 BIT(28)
  55         #define U2P_R0_BYPASS_DM_DATA                           BIT(29)
  56         #define U2P_R0_BYPASS_DP_DATA                           BIT(30)
  57
  58 #define U2P_R1                                                  0x4
  59         #define U2P_R1_BURN_IN_TEST                             BIT(0)
  60         #define U2P_R1_ACA_ENABLE                               BIT(1)
  61         #define U2P_R1_DCD_ENABLE                               BIT(2)
  62         #define U2P_R1_VDAT_SRC_EN_B                            BIT(3)
  63         #define U2P_R1_VDAT_DET_EN_B                            BIT(4)
  64         #define U2P_R1_CHARGES_SEL                              BIT(5)
  65         #define U2P_R1_TX_PREEMP_PULSE_TUNE                     BIT(6)
  66         #define U2P_R1_TX_PREEMP_AMP_TUNE_MASK                  GENMASK(8, 7)
  67         #define U2P_R1_TX_RES_TUNE_MASK                         GENMASK(10, 9)
  68         #define U2P_R1_TX_RISE_TUNE_MASK                        GENMASK(12, 11)
  69         #define U2P_R1_TX_VREF_TUNE_MASK                        GENMASK(16, 13)
  70         #define U2P_R1_TX_FSLS_TUNE_MASK                        GENMASK(20, 17)
  71         #define U2P_R1_TX_HSXV_TUNE_MASK                        GENMASK(22, 21)
  72         #define U2P_R1_OTG_TUNE_MASK                            GENMASK(25, 23)
  73         #define U2P_R1_SQRX_TUNE_MASK                           GENMASK(28, 26)
  74         #define U2P_R1_COMP_DIS_TUNE_MASK                       GENMASK(31, 29)
  75
  76 /* bits [31:14] are read-only */
  77 #define U2P_R2                                                  0x8
  78         #define U2P_R2_TESTDATA_IN_MASK                         GENMASK(7, 0)
  79         #define U2P_R2_TESTADDR_MASK                            GENMASK(11, 8)
  80         #define U2P_R2_TESTDATA_OUT_SEL                         BIT(12)
  81         #define U2P_R2_TESTCLK                                  BIT(13)
  82         #define U2P_R2_TESTDATA_OUT_MASK                        GENMASK(17, 14)
  83         #define U2P_R2_ACA_PIN_RANGE_C                          BIT(18)
  84         #define U2P_R2_ACA_PIN_RANGE_B                          BIT(19)
  85         #define U2P_R2_ACA_PIN_RANGE_A                          BIT(20)
  86         #define U2P_R2_ACA_PIN_GND                              BIT(21)
  87         #define U2P_R2_ACA_PIN_FLOAT                            BIT(22)
  88         #define U2P_R2_CHARGE_DETECT                            BIT(23)
  89         #define U2P_R2_DEVICE_SESSION_VALID                     BIT(24)
  90         #define U2P_R2_ADP_PROBE                                BIT(25)
  91         #define U2P_R2_ADP_SENSE                                BIT(26)
  92         #define U2P_R2_SESSION_END                              BIT(27)
  93         #define U2P_R2_VBUS_VALID                               BIT(28)
  94         #define U2P_R2_B_VALID                                  BIT(29)
  95         #define U2P_R2_A_VALID                                  BIT(30)
  96         #define U2P_R2_ID_DIG                                   BIT(31)
  97
  98 #define U2P_R3                                                  0xc
  99
 100 #define RESET_COMPLETE_TIME                             500
 101
 102 struct phy_meson_gxl_usb2_priv {
 103         struct regmap           *regmap;
 104 #if CONFIG_IS_ENABLED(CLK)
 105         struct clk              clk;
 106 #endif
 107 };
 108
 109 static void phy_meson_gxl_usb2_reset(struct phy_meson_gxl_usb2_priv *priv)
 110 {
 111         uint val;
 112
 113         regmap_read(priv->regmap, U2P_R0, &val);
 114
 115         /* reset the PHY and wait until settings are stabilized */
 116         val |= U2P_R0_POWER_ON_RESET;
 117         regmap_write(priv->regmap, U2P_R0, val);
 118         udelay(RESET_COMPLETE_TIME);
 119
 120         val &= ~U2P_R0_POWER_ON_RESET;
 121         regmap_write(priv->regmap, U2P_R0, val);
 122         udelay(RESET_COMPLETE_TIME);
 123 }
 124
 125 void phy_meson_gxl_usb2_set_mode(struct phy *phy, enum usb_dr_mode mode)
 126 {
 127         struct udevice *dev = phy->dev;
 128         struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
 129         uint val;
 130
 131         regmap_read(priv->regmap, U2P_R0, &val);
 132
 133         switch (mode) {
 134         case USB_DR_MODE_UNKNOWN:
 135         case USB_DR_MODE_HOST:
 136         case USB_DR_MODE_OTG:
 137                 val |= U2P_R0_DM_PULLDOWN;
 138                 val |= U2P_R0_DP_PULLDOWN;
 139                 val &= ~U2P_R0_ID_PULLUP;
 140                 break;
 141
 142         case USB_DR_MODE_PERIPHERAL:
 143                 val &= ~U2P_R0_DM_PULLDOWN;
 144                 val &= ~U2P_R0_DP_PULLDOWN;
 145                 val |= U2P_R0_ID_PULLUP;
 146                 break;
 147         }
 148
 149         regmap_write(priv->regmap, U2P_R0, val);
 150
 151         phy_meson_gxl_usb2_reset(priv);
 152 }
 153
 154 static int phy_meson_gxl_usb2_power_on(struct phy *phy)
 155 {
 156         struct udevice *dev = phy->dev;
 157         struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
 158         uint val;
 159
 160         regmap_read(priv->regmap, U2P_R0, &val);
 161         /* power on the PHY by taking it out of reset mode */
 162         val &= ~U2P_R0_POWER_ON_RESET;
 163         regmap_write(priv->regmap, U2P_R0, val);
 164
 165         phy_meson_gxl_usb2_set_mode(phy, USB_DR_MODE_HOST);
 166
 167         return 0;
 168 }
 169
 170 static int phy_meson_gxl_usb2_power_off(struct phy *phy)
 171 {
 172         struct udevice *dev = phy->dev;
 173         struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
 174         uint val;
 175
 176         regmap_read(priv->regmap, U2P_R0, &val);
 177         /* power off the PHY by putting it into reset mode */
 178         val |= U2P_R0_POWER_ON_RESET;
 179         regmap_write(priv->regmap, U2P_R0, val);
 180
 181         return 0;
 182 }
 183
 184 struct phy_ops meson_gxl_usb2_phy_ops = {
 185         .power_on = phy_meson_gxl_usb2_power_on,
 186         .power_off = phy_meson_gxl_usb2_power_off,
 187 };
 188
 189 int meson_gxl_usb2_phy_probe(struct udevice *dev)
 190 {
 191         struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
 192         int ret;
 193
 194         ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
 195         if (ret)
 196                 return ret;
 197
 198 #if CONFIG_IS_ENABLED(CLK)
 199         ret = clk_get_by_index(dev, 0, &priv->clk);
 200         if (ret < 0)
 201                 return ret;
 202
 203         ret = clk_enable(&priv->clk);
 204         if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
 205                 pr_err("failed to enable PHY clock\n");
 206                 return ret;
 207         }
 208 #endif
 209
 210         return 0;
 211 }
 212
 213 static const struct udevice_id meson_gxl_usb2_phy_ids[] = {
 214         { .compatible = "amlogic,meson-gxl-usb2-phy" },
 215         { }
 216 };
 217
 218 U_BOOT_DRIVER(meson_gxl_usb2_phy) = {
 219         .name = "meson_gxl_usb2_phy",
 220         .id = UCLASS_PHY,
 221         .of_match = meson_gxl_usb2_phy_ids,
 222         .probe = meson_gxl_usb2_phy_probe,
 223         .ops = &meson_gxl_usb2_phy_ops,
 224         .priv_auto      = sizeof(struct phy_meson_gxl_usb2_priv),
 225 };