drivers/phy/freescale/phy-fsl-imx8mq-usb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (c) 2017 NXP. */
   3
   4 #include <linux/bitfield.h>
   5 #include <linux/clk.h>
   6 #include <linux/delay.h>
   7 #include <linux/io.h>
   8 #include <linux/module.h>
   9 #include <linux/of.h>
  10 #include <linux/phy/phy.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regulator/consumer.h>
  13
  14 #define PHY_CTRL0                       0x0
  15 #define PHY_CTRL0_REF_SSP_EN            BIT(2)
  16 #define PHY_CTRL0_FSEL_MASK             GENMASK(10, 5)
  17 #define PHY_CTRL0_FSEL_24M              0x2a
  18
  19 #define PHY_CTRL1                       0x4
  20 #define PHY_CTRL1_RESET                 BIT(0)
  21 #define PHY_CTRL1_COMMONONN             BIT(1)
  22 #define PHY_CTRL1_ATERESET              BIT(3)
  23 #define PHY_CTRL1_VDATSRCENB0           BIT(19)
  24 #define PHY_CTRL1_VDATDETENB0           BIT(20)
  25
  26 #define PHY_CTRL2                       0x8
  27 #define PHY_CTRL2_TXENABLEN0            BIT(8)
  28 #define PHY_CTRL2_OTG_DISABLE           BIT(9)
  29
  30 #define PHY_CTRL3                       0xc
  31 #define PHY_CTRL3_COMPDISTUNE_MASK      GENMASK(2, 0)
  32 #define PHY_CTRL3_TXPREEMP_TUNE_MASK    GENMASK(16, 15)
  33 #define PHY_CTRL3_TXRISE_TUNE_MASK      GENMASK(21, 20)
  34 #define PHY_CTRL3_TXVREF_TUNE_MASK      GENMASK(25, 22)
  35 #define PHY_CTRL3_TX_VBOOST_LEVEL_MASK  GENMASK(31, 29)
  36
  37 #define PHY_CTRL4                       0x10
  38 #define PHY_CTRL4_PCS_TX_DEEMPH_3P5DB_MASK      GENMASK(20, 15)
  39
  40 #define PHY_CTRL5                       0x14
  41 #define PHY_CTRL5_DMPWD_OVERRIDE_SEL    BIT(23)
  42 #define PHY_CTRL5_DMPWD_OVERRIDE        BIT(22)
  43 #define PHY_CTRL5_DPPWD_OVERRIDE_SEL    BIT(21)
  44 #define PHY_CTRL5_DPPWD_OVERRIDE        BIT(20)
  45 #define PHY_CTRL5_PCS_TX_SWING_FULL_MASK        GENMASK(6, 0)
  46
  47 #define PHY_CTRL6                       0x18
  48 #define PHY_CTRL6_ALT_CLK_EN            BIT(1)
  49 #define PHY_CTRL6_ALT_CLK_SEL           BIT(0)
  50
  51 #define PHY_TUNE_DEFAULT                0xffffffff
  52
  53 struct imx8mq_usb_phy {
  54         struct phy *phy;
  55         struct clk *clk;
  56         void __iomem *base;
  57         struct regulator *vbus;
  58         u32 pcs_tx_swing_full;
  59         u32 pcs_tx_deemph_3p5db;
  60         u32 tx_vref_tune;
  61         u32 tx_rise_tune;
  62         u32 tx_preemp_amp_tune;
  63         u32 tx_vboost_level;
  64         u32 comp_dis_tune;
  65 };
  66
  67 static u32 phy_tx_vref_tune_from_property(u32 percent)
  68 {
  69         percent = clamp(percent, 94U, 124U);
  70
  71         return DIV_ROUND_CLOSEST(percent - 94U, 2);
  72 }
  73
  74 static u32 phy_tx_rise_tune_from_property(u32 percent)
  75 {
  76         switch (percent) {
  77         case 0 ... 98:
  78                 return 3;
  79         case 99:
  80                 return 2;
  81         case 100 ... 101:
  82                 return 1;
  83         default:
  84                 return 0;
  85         }
  86 }
  87
  88 static u32 phy_tx_preemp_amp_tune_from_property(u32 microamp)
  89 {
  90         microamp = min(microamp, 1800U);
  91
  92         return microamp / 600;
  93 }
  94
  95 static u32 phy_tx_vboost_level_from_property(u32 microvolt)
  96 {
  97         switch (microvolt) {
  98         case 0 ... 960:
  99                 return 0;
 100         case 961 ... 1160:
 101                 return 2;
 102         default:
 103                 return 3;
 104         }
 105 }
 106
 107 static u32 phy_pcs_tx_deemph_3p5db_from_property(u32 decibel)
 108 {
 109         return min(decibel, 36U);
 110 }
 111
 112 static u32 phy_comp_dis_tune_from_property(u32 percent)
 113 {
 114         switch (percent) {
 115         case 0 ... 92:
 116                 return 0;
 117         case 93 ... 95:
 118                 return 1;
 119         case 96 ... 97:
 120                 return 2;
 121         case 98 ... 102:
 122                 return 3;
 123         case 103 ... 105:
 124                 return 4;
 125         case 106 ... 109:
 126                 return 5;
 127         case 110 ... 113:
 128                 return 6;
 129         default:
 130                 return 7;
 131         }
 132 }
 133 static u32 phy_pcs_tx_swing_full_from_property(u32 percent)
 134 {
 135         percent = min(percent, 100U);
 136
 137         return (percent * 127) / 100;
 138 }
 139
 140 static void imx8m_get_phy_tuning_data(struct imx8mq_usb_phy *imx_phy)
 141 {
 142         struct device *dev = imx_phy->phy->dev.parent;
 143
 144         if (device_property_read_u32(dev, "fsl,phy-tx-vref-tune-percent",
 145                                      &imx_phy->tx_vref_tune))
 146                 imx_phy->tx_vref_tune = PHY_TUNE_DEFAULT;
 147         else
 148                 imx_phy->tx_vref_tune =
 149                         phy_tx_vref_tune_from_property(imx_phy->tx_vref_tune);
 150
 151         if (device_property_read_u32(dev, "fsl,phy-tx-rise-tune-percent",
 152                                      &imx_phy->tx_rise_tune))
 153                 imx_phy->tx_rise_tune = PHY_TUNE_DEFAULT;
 154         else
 155                 imx_phy->tx_rise_tune =
 156                         phy_tx_rise_tune_from_property(imx_phy->tx_rise_tune);
 157
 158         if (device_property_read_u32(dev, "fsl,phy-tx-preemp-amp-tune-microamp",
 159                                      &imx_phy->tx_preemp_amp_tune))
 160                 imx_phy->tx_preemp_amp_tune = PHY_TUNE_DEFAULT;
 161         else
 162                 imx_phy->tx_preemp_amp_tune =
 163                         phy_tx_preemp_amp_tune_from_property(imx_phy->tx_preemp_amp_tune);
 164
 165         if (device_property_read_u32(dev, "fsl,phy-tx-vboost-level-microvolt",
 166                                      &imx_phy->tx_vboost_level))
 167                 imx_phy->tx_vboost_level = PHY_TUNE_DEFAULT;
 168         else
 169                 imx_phy->tx_vboost_level =
 170                         phy_tx_vboost_level_from_property(imx_phy->tx_vboost_level);
 171
 172         if (device_property_read_u32(dev, "fsl,phy-comp-dis-tune-percent",
 173                                      &imx_phy->comp_dis_tune))
 174                 imx_phy->comp_dis_tune = PHY_TUNE_DEFAULT;
 175         else
 176                 imx_phy->comp_dis_tune =
 177                         phy_comp_dis_tune_from_property(imx_phy->comp_dis_tune);
 178
 179         if (device_property_read_u32(dev, "fsl,pcs-tx-deemph-3p5db-attenuation-db",
 180                                      &imx_phy->pcs_tx_deemph_3p5db))
 181                 imx_phy->pcs_tx_deemph_3p5db = PHY_TUNE_DEFAULT;
 182         else
 183                 imx_phy->pcs_tx_deemph_3p5db =
 184                         phy_pcs_tx_deemph_3p5db_from_property(imx_phy->pcs_tx_deemph_3p5db);
 185
 186         if (device_property_read_u32(dev, "fsl,phy-pcs-tx-swing-full-percent",
 187                                      &imx_phy->pcs_tx_swing_full))
 188                 imx_phy->pcs_tx_swing_full = PHY_TUNE_DEFAULT;
 189         else
 190                 imx_phy->pcs_tx_swing_full =
 191                         phy_pcs_tx_swing_full_from_property(imx_phy->pcs_tx_swing_full);
 192 }
 193
 194 static void imx8m_phy_tune(struct imx8mq_usb_phy *imx_phy)
 195 {
 196         u32 value;
 197
 198         /* PHY tuning */
 199         if (imx_phy->pcs_tx_deemph_3p5db != PHY_TUNE_DEFAULT) {
 200                 value = readl(imx_phy->base + PHY_CTRL4);
 201                 value &= ~PHY_CTRL4_PCS_TX_DEEMPH_3P5DB_MASK;
 202                 value |= FIELD_PREP(PHY_CTRL4_PCS_TX_DEEMPH_3P5DB_MASK,
 203                                    imx_phy->pcs_tx_deemph_3p5db);
 204                 writel(value, imx_phy->base + PHY_CTRL4);
 205         }
 206
 207         if (imx_phy->pcs_tx_swing_full != PHY_TUNE_DEFAULT) {
 208                 value = readl(imx_phy->base + PHY_CTRL5);
 209                 value |= FIELD_PREP(PHY_CTRL5_PCS_TX_SWING_FULL_MASK,
 210                                    imx_phy->pcs_tx_swing_full);
 211                 writel(value, imx_phy->base + PHY_CTRL5);
 212         }
 213
 214         if ((imx_phy->tx_vref_tune & imx_phy->tx_rise_tune &
 215              imx_phy->tx_preemp_amp_tune & imx_phy->comp_dis_tune &
 216              imx_phy->tx_vboost_level) == PHY_TUNE_DEFAULT)
 217                 /* If all are the default values, no need update. */
 218                 return;
 219
 220         value = readl(imx_phy->base + PHY_CTRL3);
 221
 222         if (imx_phy->tx_vref_tune != PHY_TUNE_DEFAULT) {
 223                 value &= ~PHY_CTRL3_TXVREF_TUNE_MASK;
 224                 value |= FIELD_PREP(PHY_CTRL3_TXVREF_TUNE_MASK,
 225                                    imx_phy->tx_vref_tune);
 226         }
 227
 228         if (imx_phy->tx_rise_tune != PHY_TUNE_DEFAULT) {
 229                 value &= ~PHY_CTRL3_TXRISE_TUNE_MASK;
 230                 value |= FIELD_PREP(PHY_CTRL3_TXRISE_TUNE_MASK,
 231                                     imx_phy->tx_rise_tune);
 232         }
 233
 234         if (imx_phy->tx_preemp_amp_tune != PHY_TUNE_DEFAULT) {
 235                 value &= ~PHY_CTRL3_TXPREEMP_TUNE_MASK;
 236                 value |= FIELD_PREP(PHY_CTRL3_TXPREEMP_TUNE_MASK,
 237                                 imx_phy->tx_preemp_amp_tune);
 238         }
 239
 240         if (imx_phy->comp_dis_tune != PHY_TUNE_DEFAULT) {
 241                 value &= ~PHY_CTRL3_COMPDISTUNE_MASK;
 242                 value |= FIELD_PREP(PHY_CTRL3_COMPDISTUNE_MASK,
 243                                     imx_phy->comp_dis_tune);
 244         }
 245
 246         if (imx_phy->tx_vboost_level != PHY_TUNE_DEFAULT) {
 247                 value &= ~PHY_CTRL3_TX_VBOOST_LEVEL_MASK;
 248                 value |= FIELD_PREP(PHY_CTRL3_TX_VBOOST_LEVEL_MASK,
 249                                     imx_phy->tx_vboost_level);
 250         }
 251
 252         writel(value, imx_phy->base + PHY_CTRL3);
 253 }
 254
 255 static int imx8mq_usb_phy_init(struct phy *phy)
 256 {
 257         struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
 258         u32 value;
 259
 260         value = readl(imx_phy->base + PHY_CTRL1);
 261         value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0 |
 262                    PHY_CTRL1_COMMONONN);
 263         value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
 264         writel(value, imx_phy->base + PHY_CTRL1);
 265
 266         value = readl(imx_phy->base + PHY_CTRL0);
 267         value |= PHY_CTRL0_REF_SSP_EN;
 268         writel(value, imx_phy->base + PHY_CTRL0);
 269
 270         value = readl(imx_phy->base + PHY_CTRL2);
 271         value |= PHY_CTRL2_TXENABLEN0;
 272         writel(value, imx_phy->base + PHY_CTRL2);
 273
 274         value = readl(imx_phy->base + PHY_CTRL1);
 275         value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
 276         writel(value, imx_phy->base + PHY_CTRL1);
 277
 278         return 0;
 279 }
 280
 281 static int imx8mp_usb_phy_init(struct phy *phy)
 282 {
 283         struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
 284         u32 value;
 285
 286         /* USB3.0 PHY signal fsel for 24M ref */
 287         value = readl(imx_phy->base + PHY_CTRL0);
 288         value &= ~PHY_CTRL0_FSEL_MASK;
 289         value |= FIELD_PREP(PHY_CTRL0_FSEL_MASK, PHY_CTRL0_FSEL_24M);
 290         writel(value, imx_phy->base + PHY_CTRL0);
 291
 292         /* Disable alt_clk_en and use internal MPLL clocks */
 293         value = readl(imx_phy->base + PHY_CTRL6);
 294         value &= ~(PHY_CTRL6_ALT_CLK_SEL | PHY_CTRL6_ALT_CLK_EN);
 295         writel(value, imx_phy->base + PHY_CTRL6);
 296
 297         value = readl(imx_phy->base + PHY_CTRL1);
 298         value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0);
 299         value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
 300         writel(value, imx_phy->base + PHY_CTRL1);
 301
 302         value = readl(imx_phy->base + PHY_CTRL0);
 303         value |= PHY_CTRL0_REF_SSP_EN;
 304         writel(value, imx_phy->base + PHY_CTRL0);
 305
 306         value = readl(imx_phy->base + PHY_CTRL2);
 307         value |= PHY_CTRL2_TXENABLEN0 | PHY_CTRL2_OTG_DISABLE;
 308         writel(value, imx_phy->base + PHY_CTRL2);
 309
 310         udelay(10);
 311
 312         value = readl(imx_phy->base + PHY_CTRL1);
 313         value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
 314         writel(value, imx_phy->base + PHY_CTRL1);
 315
 316         imx8m_phy_tune(imx_phy);
 317
 318         return 0;
 319 }
 320
 321 static int imx8mq_phy_power_on(struct phy *phy)
 322 {
 323         struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
 324         int ret;
 325
 326         ret = regulator_enable(imx_phy->vbus);
 327         if (ret)
 328                 return ret;
 329
 330         return clk_prepare_enable(imx_phy->clk);
 331 }
 332
 333 static int imx8mq_phy_power_off(struct phy *phy)
 334 {
 335         struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
 336
 337         clk_disable_unprepare(imx_phy->clk);
 338         regulator_disable(imx_phy->vbus);
 339
 340         return 0;
 341 }
 342
 343 static const struct phy_ops imx8mq_usb_phy_ops = {
 344         .init           = imx8mq_usb_phy_init,
 345         .power_on       = imx8mq_phy_power_on,
 346         .power_off      = imx8mq_phy_power_off,
 347         .owner          = THIS_MODULE,
 348 };
 349
 350 static const struct phy_ops imx8mp_usb_phy_ops = {
 351         .init           = imx8mp_usb_phy_init,
 352         .power_on       = imx8mq_phy_power_on,
 353         .power_off      = imx8mq_phy_power_off,
 354         .owner          = THIS_MODULE,
 355 };
 356
 357 static const struct of_device_id imx8mq_usb_phy_of_match[] = {
 358         {.compatible = "fsl,imx8mq-usb-phy",
 359          .data = &imx8mq_usb_phy_ops,},
 360         {.compatible = "fsl,imx8mp-usb-phy",
 361          .data = &imx8mp_usb_phy_ops,},
 362         { }
 363 };
 364 MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
 365
 366 static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 367 {
 368         struct phy_provider *phy_provider;
 369         struct device *dev = &pdev->dev;
 370         struct imx8mq_usb_phy *imx_phy;
 371         const struct phy_ops *phy_ops;
 372
 373         imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
 374         if (!imx_phy)
 375                 return -ENOMEM;
 376
 377         imx_phy->clk = devm_clk_get(dev, "phy");
 378         if (IS_ERR(imx_phy->clk)) {
 379                 dev_err(dev, "failed to get imx8mq usb phy clock\n");
 380                 return PTR_ERR(imx_phy->clk);
 381         }
 382
 383         imx_phy->base = devm_platform_ioremap_resource(pdev, 0);
 384         if (IS_ERR(imx_phy->base))
 385                 return PTR_ERR(imx_phy->base);
 386
 387         phy_ops = of_device_get_match_data(dev);
 388         if (!phy_ops)
 389                 return -EINVAL;
 390
 391         imx_phy->phy = devm_phy_create(dev, NULL, phy_ops);
 392         if (IS_ERR(imx_phy->phy))
 393                 return PTR_ERR(imx_phy->phy);
 394
 395         imx_phy->vbus = devm_regulator_get(dev, "vbus");
 396         if (IS_ERR(imx_phy->vbus))
 397                 return dev_err_probe(dev, PTR_ERR(imx_phy->vbus), "failed to get vbus\n");
 398
 399         phy_set_drvdata(imx_phy->phy, imx_phy);
 400
 401         imx8m_get_phy_tuning_data(imx_phy);
 402
 403         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 404
 405         return PTR_ERR_OR_ZERO(phy_provider);
 406 }
 407
 408 static struct platform_driver imx8mq_usb_phy_driver = {
 409         .probe  = imx8mq_usb_phy_probe,
 410         .driver = {
 411                 .name   = "imx8mq-usb-phy",
 412                 .of_match_table = imx8mq_usb_phy_of_match,
 413         }
 414 };
 415 module_platform_driver(imx8mq_usb_phy_driver);
 416
 417 MODULE_DESCRIPTION("FSL IMX8MQ USB PHY driver");
 418 MODULE_LICENSE("GPL");