drivers/phy/amlogic/phy-meson8b-usb2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Meson8, Meson8b and GXBB USB2 PHY driver
   4  *
   5  * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/delay.h>
  10 #include <linux/io.h>
  11 #include <linux/module.h>
  12 #include <linux/of_device.h>
  13 #include <linux/property.h>
  14 #include <linux/regmap.h>
  15 #include <linux/reset.h>
  16 #include <linux/phy/phy.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/usb/of.h>
  19
  20 #define REG_CONFIG                                      0x00
  21         #define REG_CONFIG_CLK_EN                       BIT(0)
  22         #define REG_CONFIG_CLK_SEL_MASK                 GENMASK(3, 1)
  23         #define REG_CONFIG_CLK_DIV_MASK                 GENMASK(10, 4)
  24         #define REG_CONFIG_CLK_32k_ALTSEL               BIT(15)
  25         #define REG_CONFIG_TEST_TRIG                    BIT(31)
  26
  27 #define REG_CTRL                                        0x04
  28         #define REG_CTRL_SOFT_PRST                      BIT(0)
  29         #define REG_CTRL_SOFT_HRESET                    BIT(1)
  30         #define REG_CTRL_SS_SCALEDOWN_MODE_MASK         GENMASK(3, 2)
  31         #define REG_CTRL_CLK_DET_RST                    BIT(4)
  32         #define REG_CTRL_INTR_SEL                       BIT(5)
  33         #define REG_CTRL_CLK_DETECTED                   BIT(8)
  34         #define REG_CTRL_SOF_SENT_RCVD_TGL              BIT(9)
  35         #define REG_CTRL_SOF_TOGGLE_OUT                 BIT(10)
  36         #define REG_CTRL_POWER_ON_RESET                 BIT(15)
  37         #define REG_CTRL_SLEEPM                         BIT(16)
  38         #define REG_CTRL_TX_BITSTUFF_ENN_H              BIT(17)
  39         #define REG_CTRL_TX_BITSTUFF_ENN                BIT(18)
  40         #define REG_CTRL_COMMON_ON                      BIT(19)
  41         #define REG_CTRL_REF_CLK_SEL_MASK               GENMASK(21, 20)
  42         #define REG_CTRL_REF_CLK_SEL_SHIFT              20
  43         #define REG_CTRL_FSEL_MASK                      GENMASK(24, 22)
  44         #define REG_CTRL_FSEL_SHIFT                     22
  45         #define REG_CTRL_PORT_RESET                     BIT(25)
  46         #define REG_CTRL_THREAD_ID_MASK                 GENMASK(31, 26)
  47
  48 #define REG_ENDP_INTR                                   0x08
  49
  50 /* bits [31:26], [24:21] and [15:3] seem to be read-only */
  51 #define REG_ADP_BC                                      0x0c
  52         #define REG_ADP_BC_VBUS_VLD_EXT_SEL             BIT(0)
  53         #define REG_ADP_BC_VBUS_VLD_EXT                 BIT(1)
  54         #define REG_ADP_BC_OTG_DISABLE                  BIT(2)
  55         #define REG_ADP_BC_ID_PULLUP                    BIT(3)
  56         #define REG_ADP_BC_DRV_VBUS                     BIT(4)
  57         #define REG_ADP_BC_ADP_PRB_EN                   BIT(5)
  58         #define REG_ADP_BC_ADP_DISCHARGE                BIT(6)
  59         #define REG_ADP_BC_ADP_CHARGE                   BIT(7)
  60         #define REG_ADP_BC_SESS_END                     BIT(8)
  61         #define REG_ADP_BC_DEVICE_SESS_VLD              BIT(9)
  62         #define REG_ADP_BC_B_VALID                      BIT(10)
  63         #define REG_ADP_BC_A_VALID                      BIT(11)
  64         #define REG_ADP_BC_ID_DIG                       BIT(12)
  65         #define REG_ADP_BC_VBUS_VALID                   BIT(13)
  66         #define REG_ADP_BC_ADP_PROBE                    BIT(14)
  67         #define REG_ADP_BC_ADP_SENSE                    BIT(15)
  68         #define REG_ADP_BC_ACA_ENABLE                   BIT(16)
  69         #define REG_ADP_BC_DCD_ENABLE                   BIT(17)
  70         #define REG_ADP_BC_VDAT_DET_EN_B                BIT(18)
  71         #define REG_ADP_BC_VDAT_SRC_EN_B                BIT(19)
  72         #define REG_ADP_BC_CHARGE_SEL                   BIT(20)
  73         #define REG_ADP_BC_CHARGE_DETECT                BIT(21)
  74         #define REG_ADP_BC_ACA_PIN_RANGE_C              BIT(22)
  75         #define REG_ADP_BC_ACA_PIN_RANGE_B              BIT(23)
  76         #define REG_ADP_BC_ACA_PIN_RANGE_A              BIT(24)
  77         #define REG_ADP_BC_ACA_PIN_GND                  BIT(25)
  78         #define REG_ADP_BC_ACA_PIN_FLOAT                BIT(26)
  79
  80 #define REG_DBG_UART                                    0x10
  81         #define REG_DBG_UART_BYPASS_SEL                 BIT(0)
  82         #define REG_DBG_UART_BYPASS_DM_EN               BIT(1)
  83         #define REG_DBG_UART_BYPASS_DP_EN               BIT(2)
  84         #define REG_DBG_UART_BYPASS_DM_DATA             BIT(3)
  85         #define REG_DBG_UART_BYPASS_DP_DATA             BIT(4)
  86         #define REG_DBG_UART_FSV_MINUS                  BIT(5)
  87         #define REG_DBG_UART_FSV_PLUS                   BIT(6)
  88         #define REG_DBG_UART_FSV_BURN_IN_TEST           BIT(7)
  89         #define REG_DBG_UART_LOOPBACK_EN_B              BIT(8)
  90         #define REG_DBG_UART_SET_IDDQ                   BIT(9)
  91         #define REG_DBG_UART_ATE_RESET                  BIT(10)
  92
  93 #define REG_TEST                                        0x14
  94         #define REG_TEST_DATA_IN_MASK                   GENMASK(3, 0)
  95         #define REG_TEST_EN_MASK                        GENMASK(7, 4)
  96         #define REG_TEST_ADDR_MASK                      GENMASK(11, 8)
  97         #define REG_TEST_DATA_OUT_SEL                   BIT(12)
  98         #define REG_TEST_CLK                            BIT(13)
  99         #define REG_TEST_VA_TEST_EN_B_MASK              GENMASK(15, 14)
 100         #define REG_TEST_DATA_OUT_MASK                  GENMASK(19, 16)
 101         #define REG_TEST_DISABLE_ID_PULLUP              BIT(20)
 102
 103 #define REG_TUNE                                        0x18
 104         #define REG_TUNE_TX_RES_TUNE_MASK               GENMASK(1, 0)
 105         #define REG_TUNE_TX_HSXV_TUNE_MASK              GENMASK(3, 2)
 106         #define REG_TUNE_TX_VREF_TUNE_MASK              GENMASK(7, 4)
 107         #define REG_TUNE_TX_RISE_TUNE_MASK              GENMASK(9, 8)
 108         #define REG_TUNE_TX_PREEMP_PULSE_TUNE           BIT(10)
 109         #define REG_TUNE_TX_PREEMP_AMP_TUNE_MASK        GENMASK(12, 11)
 110         #define REG_TUNE_TX_FSLS_TUNE_MASK              GENMASK(16, 13)
 111         #define REG_TUNE_SQRX_TUNE_MASK                 GENMASK(19, 17)
 112         #define REG_TUNE_OTG_TUNE                       GENMASK(22, 20)
 113         #define REG_TUNE_COMP_DIS_TUNE                  GENMASK(25, 23)
 114         #define REG_TUNE_HOST_DM_PULLDOWN               BIT(26)
 115         #define REG_TUNE_HOST_DP_PULLDOWN               BIT(27)
 116
 117 #define RESET_COMPLETE_TIME                             500
 118 #define ACA_ENABLE_COMPLETE_TIME                        50
 119
 120 struct phy_meson8b_usb2_match_data {
 121         bool                    host_enable_aca;
 122 };
 123
 124 struct phy_meson8b_usb2_priv {
 125         struct regmap                                   *regmap;
 126         enum usb_dr_mode                                dr_mode;
 127         struct clk                                      *clk_usb_general;
 128         struct clk                                      *clk_usb;
 129         struct reset_control                            *reset;
 130         const struct phy_meson8b_usb2_match_data        *match;
 131 };
 132
 133 static const struct regmap_config phy_meson8b_usb2_regmap_conf = {
 134         .reg_bits = 8,
 135         .val_bits = 32,
 136         .reg_stride = 4,
 137         .max_register = REG_TUNE,
 138 };
 139
 140 static int phy_meson8b_usb2_power_on(struct phy *phy)
 141 {
 142         struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
 143         u32 reg;
 144         int ret;
 145
 146         if (!IS_ERR_OR_NULL(priv->reset)) {
 147                 ret = reset_control_reset(priv->reset);
 148                 if (ret) {
 149                         dev_err(&phy->dev, "Failed to trigger USB reset\n");
 150                         return ret;
 151                 }
 152         }
 153
 154         ret = clk_prepare_enable(priv->clk_usb_general);
 155         if (ret) {
 156                 dev_err(&phy->dev, "Failed to enable USB general clock\n");
 157                 return ret;
 158         }
 159
 160         ret = clk_prepare_enable(priv->clk_usb);
 161         if (ret) {
 162                 dev_err(&phy->dev, "Failed to enable USB DDR clock\n");
 163                 clk_disable_unprepare(priv->clk_usb_general);
 164                 return ret;
 165         }
 166
 167         regmap_update_bits(priv->regmap, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,
 168                            REG_CONFIG_CLK_32k_ALTSEL);
 169
 170         regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
 171                            0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
 172
 173         regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_FSEL_MASK,
 174                            0x5 << REG_CTRL_FSEL_SHIFT);
 175
 176         /* reset the PHY */
 177         regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,
 178                            REG_CTRL_POWER_ON_RESET);
 179         udelay(RESET_COMPLETE_TIME);
 180         regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);
 181         udelay(RESET_COMPLETE_TIME);
 182
 183         regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
 184                            REG_CTRL_SOF_TOGGLE_OUT);
 185
 186         if (priv->dr_mode == USB_DR_MODE_HOST) {
 187                 regmap_update_bits(priv->regmap, REG_DBG_UART,
 188                                    REG_DBG_UART_SET_IDDQ, 0);
 189
 190                 if (priv->match->host_enable_aca) {
 191                         regmap_update_bits(priv->regmap, REG_ADP_BC,
 192                                            REG_ADP_BC_ACA_ENABLE,
 193                                            REG_ADP_BC_ACA_ENABLE);
 194
 195                         udelay(ACA_ENABLE_COMPLETE_TIME);
 196
 197                         regmap_read(priv->regmap, REG_ADP_BC, &reg);
 198                         if (reg & REG_ADP_BC_ACA_PIN_FLOAT) {
 199                                 dev_warn(&phy->dev, "USB ID detect failed!\n");
 200                                 clk_disable_unprepare(priv->clk_usb);
 201                                 clk_disable_unprepare(priv->clk_usb_general);
 202                                 return -EINVAL;
 203                         }
 204                 }
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int phy_meson8b_usb2_power_off(struct phy *phy)
 211 {
 212         struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
 213
 214         if (priv->dr_mode == USB_DR_MODE_HOST)
 215                 regmap_update_bits(priv->regmap, REG_DBG_UART,
 216                                    REG_DBG_UART_SET_IDDQ,
 217                                    REG_DBG_UART_SET_IDDQ);
 218
 219         clk_disable_unprepare(priv->clk_usb);
 220         clk_disable_unprepare(priv->clk_usb_general);
 221
 222         /* power off the PHY by putting it into reset mode */
 223         regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,
 224                            REG_CTRL_POWER_ON_RESET);
 225
 226         return 0;
 227 }
 228
 229 static const struct phy_ops phy_meson8b_usb2_ops = {
 230         .power_on       = phy_meson8b_usb2_power_on,
 231         .power_off      = phy_meson8b_usb2_power_off,
 232         .owner          = THIS_MODULE,
 233 };
 234
 235 static int phy_meson8b_usb2_probe(struct platform_device *pdev)
 236 {
 237         struct phy_meson8b_usb2_priv *priv;
 238         struct phy *phy;
 239         struct phy_provider *phy_provider;
 240         void __iomem *base;
 241
 242         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 243         if (!priv)
 244                 return -ENOMEM;
 245
 246         base = devm_platform_ioremap_resource(pdev, 0);
 247         if (IS_ERR(base))
 248                 return PTR_ERR(base);
 249
 250         priv->match = device_get_match_data(&pdev->dev);
 251         if (!priv->match)
 252                 return -ENODEV;
 253
 254         priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
 255                                              &phy_meson8b_usb2_regmap_conf);
 256         if (IS_ERR(priv->regmap))
 257                 return PTR_ERR(priv->regmap);
 258
 259         priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general");
 260         if (IS_ERR(priv->clk_usb_general))
 261                 return PTR_ERR(priv->clk_usb_general);
 262
 263         priv->clk_usb = devm_clk_get(&pdev->dev, "usb");
 264         if (IS_ERR(priv->clk_usb))
 265                 return PTR_ERR(priv->clk_usb);
 266
 267         priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
 268         if (PTR_ERR(priv->reset) == -EPROBE_DEFER)
 269                 return PTR_ERR(priv->reset);
 270
 271         priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
 272         if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
 273                 dev_err(&pdev->dev,
 274                         "missing dual role configuration of the controller\n");
 275                 return -EINVAL;
 276         }
 277
 278         phy = devm_phy_create(&pdev->dev, NULL, &phy_meson8b_usb2_ops);
 279         if (IS_ERR(phy)) {
 280                 return dev_err_probe(&pdev->dev, PTR_ERR(phy),
 281                                      "failed to create PHY\n");
 282         }
 283
 284         phy_set_drvdata(phy, priv);
 285
 286         phy_provider =
 287                 devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
 288
 289         return PTR_ERR_OR_ZERO(phy_provider);
 290 }
 291
 292 static const struct phy_meson8b_usb2_match_data phy_meson8_usb2_match_data = {
 293         .host_enable_aca = false,
 294 };
 295
 296 static const struct phy_meson8b_usb2_match_data phy_meson8b_usb2_match_data = {
 297         .host_enable_aca = true,
 298 };
 299
 300 static const struct of_device_id phy_meson8b_usb2_of_match[] = {
 301         {
 302                 .compatible = "amlogic,meson8-usb2-phy",
 303                 .data = &phy_meson8_usb2_match_data
 304         },
 305         {
 306                 .compatible = "amlogic,meson8b-usb2-phy",
 307                 .data = &phy_meson8b_usb2_match_data
 308         },
 309         {
 310                 .compatible = "amlogic,meson8m2-usb2-phy",
 311                 .data = &phy_meson8b_usb2_match_data
 312         },
 313         {
 314                 .compatible = "amlogic,meson-gxbb-usb2-phy",
 315                 .data = &phy_meson8b_usb2_match_data
 316         },
 317         { /* sentinel */ }
 318 };
 319 MODULE_DEVICE_TABLE(of, phy_meson8b_usb2_of_match);
 320
 321 static struct platform_driver phy_meson8b_usb2_driver = {
 322         .probe  = phy_meson8b_usb2_probe,
 323         .driver = {
 324                 .name           = "phy-meson-usb2",
 325                 .of_match_table = phy_meson8b_usb2_of_match,
 326         },
 327 };
 328 module_platform_driver(phy_meson8b_usb2_driver);
 329
 330 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
 331 MODULE_DESCRIPTION("Meson8, Meson8b, Meson8m2 and GXBB USB2 PHY driver");
 332 MODULE_LICENSE("GPL");