drivers/phy/qualcomm/phy-qcom-ufs.c

   1 /*
   2  * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include "phy-qcom-ufs-i.h"
  16
  17 #define MAX_PROP_NAME              32
  18 #define VDDA_PHY_MIN_UV            1000000
  19 #define VDDA_PHY_MAX_UV            1000000
  20 #define VDDA_PLL_MIN_UV            1800000
  21 #define VDDA_PLL_MAX_UV            1800000
  22 #define VDDP_REF_CLK_MIN_UV        1200000
  23 #define VDDP_REF_CLK_MAX_UV        1200000
  24
  25 int ufs_qcom_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
  26                            struct ufs_qcom_phy_calibration *tbl_A,
  27                            int tbl_size_A,
  28                            struct ufs_qcom_phy_calibration *tbl_B,
  29                            int tbl_size_B, bool is_rate_B)
  30 {
  31         int i;
  32         int ret = 0;
  33
  34         if (!tbl_A) {
  35                 dev_err(ufs_qcom_phy->dev, "%s: tbl_A is NULL", __func__);
  36                 ret = EINVAL;
  37                 goto out;
  38         }
  39
  40         for (i = 0; i < tbl_size_A; i++)
  41                 writel_relaxed(tbl_A[i].cfg_value,
  42                                ufs_qcom_phy->mmio + tbl_A[i].reg_offset);
  43
  44         /*
  45          * In case we would like to work in rate B, we need
  46          * to override a registers that were configured in rate A table
  47          * with registers of rate B table.
  48          * table.
  49          */
  50         if (is_rate_B) {
  51                 if (!tbl_B) {
  52                         dev_err(ufs_qcom_phy->dev, "%s: tbl_B is NULL",
  53                                 __func__);
  54                         ret = EINVAL;
  55                         goto out;
  56                 }
  57
  58                 for (i = 0; i < tbl_size_B; i++)
  59                         writel_relaxed(tbl_B[i].cfg_value,
  60                                 ufs_qcom_phy->mmio + tbl_B[i].reg_offset);
  61         }
  62
  63         /* flush buffered writes */
  64         mb();
  65
  66 out:
  67         return ret;
  68 }
  69 EXPORT_SYMBOL_GPL(ufs_qcom_phy_calibrate);
  70
  71 /*
  72  * This assumes the embedded phy structure inside generic_phy is of type
  73  * struct ufs_qcom_phy. In order to function properly it's crucial
  74  * to keep the embedded struct "struct ufs_qcom_phy common_cfg"
  75  * as the first inside generic_phy.
  76  */
  77 struct ufs_qcom_phy *get_ufs_qcom_phy(struct phy *generic_phy)
  78 {
  79         return (struct ufs_qcom_phy *)phy_get_drvdata(generic_phy);
  80 }
  81 EXPORT_SYMBOL_GPL(get_ufs_qcom_phy);
  82
  83 static
  84 int ufs_qcom_phy_base_init(struct platform_device *pdev,
  85                            struct ufs_qcom_phy *phy_common)
  86 {
  87         struct device *dev = &pdev->dev;
  88         struct resource *res;
  89         int err = 0;
  90
  91         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_mem");
  92         phy_common->mmio = devm_ioremap_resource(dev, res);
  93         if (IS_ERR((void const *)phy_common->mmio)) {
  94                 err = PTR_ERR((void const *)phy_common->mmio);
  95                 phy_common->mmio = NULL;
  96                 dev_err(dev, "%s: ioremap for phy_mem resource failed %d\n",
  97                         __func__, err);
  98                 return err;
  99         }
 100
 101         /* "dev_ref_clk_ctrl_mem" is optional resource */
 102         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 103                                            "dev_ref_clk_ctrl_mem");
 104         phy_common->dev_ref_clk_ctrl_mmio = devm_ioremap_resource(dev, res);
 105         if (IS_ERR((void const *)phy_common->dev_ref_clk_ctrl_mmio))
 106                 phy_common->dev_ref_clk_ctrl_mmio = NULL;
 107
 108         return 0;
 109 }
 110
 111 struct phy *ufs_qcom_phy_generic_probe(struct platform_device *pdev,
 112                                 struct ufs_qcom_phy *common_cfg,
 113                                 const struct phy_ops *ufs_qcom_phy_gen_ops,
 114                                 struct ufs_qcom_phy_specific_ops *phy_spec_ops)
 115 {
 116         int err;
 117         struct device *dev = &pdev->dev;
 118         struct phy *generic_phy = NULL;
 119         struct phy_provider *phy_provider;
 120
 121         err = ufs_qcom_phy_base_init(pdev, common_cfg);
 122         if (err) {
 123                 dev_err(dev, "%s: phy base init failed %d\n", __func__, err);
 124                 goto out;
 125         }
 126
 127         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 128         if (IS_ERR(phy_provider)) {
 129                 err = PTR_ERR(phy_provider);
 130                 dev_err(dev, "%s: failed to register phy %d\n", __func__, err);
 131                 goto out;
 132         }
 133
 134         generic_phy = devm_phy_create(dev, NULL, ufs_qcom_phy_gen_ops);
 135         if (IS_ERR(generic_phy)) {
 136                 err =  PTR_ERR(generic_phy);
 137                 dev_err(dev, "%s: failed to create phy %d\n", __func__, err);
 138                 generic_phy = NULL;
 139                 goto out;
 140         }
 141
 142         common_cfg->phy_spec_ops = phy_spec_ops;
 143         common_cfg->dev = dev;
 144
 145 out:
 146         return generic_phy;
 147 }
 148 EXPORT_SYMBOL_GPL(ufs_qcom_phy_generic_probe);
 149
 150 static int __ufs_qcom_phy_clk_get(struct device *dev,
 151                          const char *name, struct clk **clk_out, bool err_print)
 152 {
 153         struct clk *clk;
 154         int err = 0;
 155
 156         clk = devm_clk_get(dev, name);
 157         if (IS_ERR(clk)) {
 158                 err = PTR_ERR(clk);
 159                 if (err_print)
 160                         dev_err(dev, "failed to get %s err %d", name, err);
 161         } else {
 162                 *clk_out = clk;
 163         }
 164
 165         return err;
 166 }
 167
 168 static int ufs_qcom_phy_clk_get(struct device *dev,
 169                          const char *name, struct clk **clk_out)
 170 {
 171         return __ufs_qcom_phy_clk_get(dev, name, clk_out, true);
 172 }
 173
 174 int ufs_qcom_phy_init_clks(struct ufs_qcom_phy *phy_common)
 175 {
 176         int err;
 177
 178         if (of_device_is_compatible(phy_common->dev->of_node,
 179                                 "qcom,msm8996-ufs-phy-qmp-14nm"))
 180                 goto skip_txrx_clk;
 181
 182         err = ufs_qcom_phy_clk_get(phy_common->dev, "tx_iface_clk",
 183                                    &phy_common->tx_iface_clk);
 184         if (err)
 185                 goto out;
 186
 187         err = ufs_qcom_phy_clk_get(phy_common->dev, "rx_iface_clk",
 188                                    &phy_common->rx_iface_clk);
 189         if (err)
 190                 goto out;
 191
 192 skip_txrx_clk:
 193         err = ufs_qcom_phy_clk_get(phy_common->dev, "ref_clk_src",
 194                                    &phy_common->ref_clk_src);
 195         if (err)
 196                 goto out;
 197
 198         /*
 199          * "ref_clk_parent" is optional hence don't abort init if it's not
 200          * found.
 201          */
 202         __ufs_qcom_phy_clk_get(phy_common->dev, "ref_clk_parent",
 203                                    &phy_common->ref_clk_parent, false);
 204
 205         err = ufs_qcom_phy_clk_get(phy_common->dev, "ref_clk",
 206                                    &phy_common->ref_clk);
 207
 208 out:
 209         return err;
 210 }
 211 EXPORT_SYMBOL_GPL(ufs_qcom_phy_init_clks);
 212
 213 static int ufs_qcom_phy_init_vreg(struct device *dev,
 214                                   struct ufs_qcom_phy_vreg *vreg,
 215                                   const char *name)
 216 {
 217         int err = 0;
 218
 219         char prop_name[MAX_PROP_NAME];
 220
 221         vreg->name = name;
 222         vreg->reg = devm_regulator_get(dev, name);
 223         if (IS_ERR(vreg->reg)) {
 224                 err = PTR_ERR(vreg->reg);
 225                 dev_err(dev, "failed to get %s, %d\n", name, err);
 226                 goto out;
 227         }
 228
 229         if (dev->of_node) {
 230                 snprintf(prop_name, MAX_PROP_NAME, "%s-max-microamp", name);
 231                 err = of_property_read_u32(dev->of_node,
 232                                         prop_name, &vreg->max_uA);
 233                 if (err && err != -EINVAL) {
 234                         dev_err(dev, "%s: failed to read %s\n",
 235                                         __func__, prop_name);
 236                         goto out;
 237                 } else if (err == -EINVAL || !vreg->max_uA) {
 238                         if (regulator_count_voltages(vreg->reg) > 0) {
 239                                 dev_err(dev, "%s: %s is mandatory\n",
 240                                                 __func__, prop_name);
 241                                 goto out;
 242                         }
 243                         err = 0;
 244                 }
 245         }
 246
 247         if (!strcmp(name, "vdda-pll")) {
 248                 vreg->max_uV = VDDA_PLL_MAX_UV;
 249                 vreg->min_uV = VDDA_PLL_MIN_UV;
 250         } else if (!strcmp(name, "vdda-phy")) {
 251                 vreg->max_uV = VDDA_PHY_MAX_UV;
 252                 vreg->min_uV = VDDA_PHY_MIN_UV;
 253         } else if (!strcmp(name, "vddp-ref-clk")) {
 254                 vreg->max_uV = VDDP_REF_CLK_MAX_UV;
 255                 vreg->min_uV = VDDP_REF_CLK_MIN_UV;
 256         }
 257
 258 out:
 259         return err;
 260 }
 261
 262 int ufs_qcom_phy_init_vregulators(struct ufs_qcom_phy *phy_common)
 263 {
 264         int err;
 265
 266         err = ufs_qcom_phy_init_vreg(phy_common->dev, &phy_common->vdda_pll,
 267                 "vdda-pll");
 268         if (err)
 269                 goto out;
 270
 271         err = ufs_qcom_phy_init_vreg(phy_common->dev, &phy_common->vdda_phy,
 272                 "vdda-phy");
 273
 274         if (err)
 275                 goto out;
 276
 277         err = ufs_qcom_phy_init_vreg(phy_common->dev, &phy_common->vddp_ref_clk,
 278                                      "vddp-ref-clk");
 279
 280 out:
 281         return err;
 282 }
 283 EXPORT_SYMBOL_GPL(ufs_qcom_phy_init_vregulators);
 284
 285 static int ufs_qcom_phy_cfg_vreg(struct device *dev,
 286                           struct ufs_qcom_phy_vreg *vreg, bool on)
 287 {
 288         int ret = 0;
 289         struct regulator *reg = vreg->reg;
 290         const char *name = vreg->name;
 291         int min_uV;
 292         int uA_load;
 293
 294         if (regulator_count_voltages(reg) > 0) {
 295                 min_uV = on ? vreg->min_uV : 0;
 296                 ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);
 297                 if (ret) {
 298                         dev_err(dev, "%s: %s set voltage failed, err=%d\n",
 299                                         __func__, name, ret);
 300                         goto out;
 301                 }
 302                 uA_load = on ? vreg->max_uA : 0;
 303                 ret = regulator_set_load(reg, uA_load);
 304                 if (ret >= 0) {
 305                         /*
 306                          * regulator_set_load() returns new regulator
 307                          * mode upon success.
 308                          */
 309                         ret = 0;
 310                 } else {
 311                         dev_err(dev, "%s: %s set optimum mode(uA_load=%d) failed, err=%d\n",
 312                                         __func__, name, uA_load, ret);
 313                         goto out;
 314                 }
 315         }
 316 out:
 317         return ret;
 318 }
 319
 320 static int ufs_qcom_phy_enable_vreg(struct device *dev,
 321                              struct ufs_qcom_phy_vreg *vreg)
 322 {
 323         int ret = 0;
 324
 325         if (!vreg || vreg->enabled)
 326                 goto out;
 327
 328         ret = ufs_qcom_phy_cfg_vreg(dev, vreg, true);
 329         if (ret) {
 330                 dev_err(dev, "%s: ufs_qcom_phy_cfg_vreg() failed, err=%d\n",
 331                         __func__, ret);
 332                 goto out;
 333         }
 334
 335         ret = regulator_enable(vreg->reg);
 336         if (ret) {
 337                 dev_err(dev, "%s: enable failed, err=%d\n",
 338                                 __func__, ret);
 339                 goto out;
 340         }
 341
 342         vreg->enabled = true;
 343 out:
 344         return ret;
 345 }
 346
 347 static int ufs_qcom_phy_enable_ref_clk(struct ufs_qcom_phy *phy)
 348 {
 349         int ret = 0;
 350
 351         if (phy->is_ref_clk_enabled)
 352                 goto out;
 353
 354         /*
 355          * reference clock is propagated in a daisy-chained manner from
 356          * source to phy, so ungate them at each stage.
 357          */
 358         ret = clk_prepare_enable(phy->ref_clk_src);
 359         if (ret) {
 360                 dev_err(phy->dev, "%s: ref_clk_src enable failed %d\n",
 361                                 __func__, ret);
 362                 goto out;
 363         }
 364
 365         /*
 366          * "ref_clk_parent" is optional clock hence make sure that clk reference
 367          * is available before trying to enable the clock.
 368          */
 369         if (phy->ref_clk_parent) {
 370                 ret = clk_prepare_enable(phy->ref_clk_parent);
 371                 if (ret) {
 372                         dev_err(phy->dev, "%s: ref_clk_parent enable failed %d\n",
 373                                         __func__, ret);
 374                         goto out_disable_src;
 375                 }
 376         }
 377
 378         ret = clk_prepare_enable(phy->ref_clk);
 379         if (ret) {
 380                 dev_err(phy->dev, "%s: ref_clk enable failed %d\n",
 381                                 __func__, ret);
 382                 goto out_disable_parent;
 383         }
 384
 385         phy->is_ref_clk_enabled = true;
 386         goto out;
 387
 388 out_disable_parent:
 389         if (phy->ref_clk_parent)
 390                 clk_disable_unprepare(phy->ref_clk_parent);
 391 out_disable_src:
 392         clk_disable_unprepare(phy->ref_clk_src);
 393 out:
 394         return ret;
 395 }
 396
 397 static int ufs_qcom_phy_disable_vreg(struct device *dev,
 398                               struct ufs_qcom_phy_vreg *vreg)
 399 {
 400         int ret = 0;
 401
 402         if (!vreg || !vreg->enabled)
 403                 goto out;
 404
 405         ret = regulator_disable(vreg->reg);
 406
 407         if (!ret) {
 408                 /* ignore errors on applying disable config */
 409                 ufs_qcom_phy_cfg_vreg(dev, vreg, false);
 410                 vreg->enabled = false;
 411         } else {
 412                 dev_err(dev, "%s: %s disable failed, err=%d\n",
 413                                 __func__, vreg->name, ret);
 414         }
 415 out:
 416         return ret;
 417 }
 418
 419 static void ufs_qcom_phy_disable_ref_clk(struct ufs_qcom_phy *phy)
 420 {
 421         if (phy->is_ref_clk_enabled) {
 422                 clk_disable_unprepare(phy->ref_clk);
 423                 /*
 424                  * "ref_clk_parent" is optional clock hence make sure that clk
 425                  * reference is available before trying to disable the clock.
 426                  */
 427                 if (phy->ref_clk_parent)
 428                         clk_disable_unprepare(phy->ref_clk_parent);
 429                 clk_disable_unprepare(phy->ref_clk_src);
 430                 phy->is_ref_clk_enabled = false;
 431         }
 432 }
 433
 434 #define UFS_REF_CLK_EN  (1 << 5)
 435
 436 static void ufs_qcom_phy_dev_ref_clk_ctrl(struct phy *generic_phy, bool enable)
 437 {
 438         struct ufs_qcom_phy *phy = get_ufs_qcom_phy(generic_phy);
 439
 440         if (phy->dev_ref_clk_ctrl_mmio &&
 441             (enable ^ phy->is_dev_ref_clk_enabled)) {
 442                 u32 temp = readl_relaxed(phy->dev_ref_clk_ctrl_mmio);
 443
 444                 if (enable)
 445                         temp |= UFS_REF_CLK_EN;
 446                 else
 447                         temp &= ~UFS_REF_CLK_EN;
 448
 449                 /*
 450                  * If we are here to disable this clock immediately after
 451                  * entering into hibern8, we need to make sure that device
 452                  * ref_clk is active atleast 1us after the hibern8 enter.
 453                  */
 454                 if (!enable)
 455                         udelay(1);
 456
 457                 writel_relaxed(temp, phy->dev_ref_clk_ctrl_mmio);
 458                 /* ensure that ref_clk is enabled/disabled before we return */
 459                 wmb();
 460                 /*
 461                  * If we call hibern8 exit after this, we need to make sure that
 462                  * device ref_clk is stable for atleast 1us before the hibern8
 463                  * exit command.
 464                  */
 465                 if (enable)
 466                         udelay(1);
 467
 468                 phy->is_dev_ref_clk_enabled = enable;
 469         }
 470 }
 471
 472 void ufs_qcom_phy_enable_dev_ref_clk(struct phy *generic_phy)
 473 {
 474         ufs_qcom_phy_dev_ref_clk_ctrl(generic_phy, true);
 475 }
 476 EXPORT_SYMBOL_GPL(ufs_qcom_phy_enable_dev_ref_clk);
 477
 478 void ufs_qcom_phy_disable_dev_ref_clk(struct phy *generic_phy)
 479 {
 480         ufs_qcom_phy_dev_ref_clk_ctrl(generic_phy, false);
 481 }
 482 EXPORT_SYMBOL_GPL(ufs_qcom_phy_disable_dev_ref_clk);
 483
 484 /* Turn ON M-PHY RMMI interface clocks */
 485 static int ufs_qcom_phy_enable_iface_clk(struct ufs_qcom_phy *phy)
 486 {
 487         int ret = 0;
 488
 489         if (phy->is_iface_clk_enabled)
 490                 goto out;
 491
 492         ret = clk_prepare_enable(phy->tx_iface_clk);
 493         if (ret) {
 494                 dev_err(phy->dev, "%s: tx_iface_clk enable failed %d\n",
 495                                 __func__, ret);
 496                 goto out;
 497         }
 498         ret = clk_prepare_enable(phy->rx_iface_clk);
 499         if (ret) {
 500                 clk_disable_unprepare(phy->tx_iface_clk);
 501                 dev_err(phy->dev, "%s: rx_iface_clk enable failed %d. disabling also tx_iface_clk\n",
 502                                 __func__, ret);
 503                 goto out;
 504         }
 505         phy->is_iface_clk_enabled = true;
 506
 507 out:
 508         return ret;
 509 }
 510
 511 /* Turn OFF M-PHY RMMI interface clocks */
 512 void ufs_qcom_phy_disable_iface_clk(struct ufs_qcom_phy *phy)
 513 {
 514         if (phy->is_iface_clk_enabled) {
 515                 clk_disable_unprepare(phy->tx_iface_clk);
 516                 clk_disable_unprepare(phy->rx_iface_clk);
 517                 phy->is_iface_clk_enabled = false;
 518         }
 519 }
 520
 521 int ufs_qcom_phy_start_serdes(struct phy *generic_phy)
 522 {
 523         struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
 524         int ret = 0;
 525
 526         if (!ufs_qcom_phy->phy_spec_ops->start_serdes) {
 527                 dev_err(ufs_qcom_phy->dev, "%s: start_serdes() callback is not supported\n",
 528                         __func__);
 529                 ret = -ENOTSUPP;
 530         } else {
 531                 ufs_qcom_phy->phy_spec_ops->start_serdes(ufs_qcom_phy);
 532         }
 533
 534         return ret;
 535 }
 536 EXPORT_SYMBOL_GPL(ufs_qcom_phy_start_serdes);
 537
 538 int ufs_qcom_phy_set_tx_lane_enable(struct phy *generic_phy, u32 tx_lanes)
 539 {
 540         struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
 541         int ret = 0;
 542
 543         if (!ufs_qcom_phy->phy_spec_ops->set_tx_lane_enable) {
 544                 dev_err(ufs_qcom_phy->dev, "%s: set_tx_lane_enable() callback is not supported\n",
 545                         __func__);
 546                 ret = -ENOTSUPP;
 547         } else {
 548                 ufs_qcom_phy->phy_spec_ops->set_tx_lane_enable(ufs_qcom_phy,
 549                                                                tx_lanes);
 550         }
 551
 552         return ret;
 553 }
 554 EXPORT_SYMBOL_GPL(ufs_qcom_phy_set_tx_lane_enable);
 555
 556 void ufs_qcom_phy_save_controller_version(struct phy *generic_phy,
 557                                           u8 major, u16 minor, u16 step)
 558 {
 559         struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
 560
 561         ufs_qcom_phy->host_ctrl_rev_major = major;
 562         ufs_qcom_phy->host_ctrl_rev_minor = minor;
 563         ufs_qcom_phy->host_ctrl_rev_step = step;
 564 }
 565 EXPORT_SYMBOL_GPL(ufs_qcom_phy_save_controller_version);
 566
 567 int ufs_qcom_phy_calibrate_phy(struct phy *generic_phy, bool is_rate_B)
 568 {
 569         struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
 570         int ret = 0;
 571
 572         if (!ufs_qcom_phy->phy_spec_ops->calibrate_phy) {
 573                 dev_err(ufs_qcom_phy->dev, "%s: calibrate_phy() callback is not supported\n",
 574                         __func__);
 575                 ret = -ENOTSUPP;
 576         } else {
 577                 ret = ufs_qcom_phy->phy_spec_ops->
 578                                 calibrate_phy(ufs_qcom_phy, is_rate_B);
 579                 if (ret)
 580                         dev_err(ufs_qcom_phy->dev, "%s: calibrate_phy() failed %d\n",
 581                                 __func__, ret);
 582         }
 583
 584         return ret;
 585 }
 586 EXPORT_SYMBOL_GPL(ufs_qcom_phy_calibrate_phy);
 587
 588 int ufs_qcom_phy_is_pcs_ready(struct phy *generic_phy)
 589 {
 590         struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
 591
 592         if (!ufs_qcom_phy->phy_spec_ops->is_physical_coding_sublayer_ready) {
 593                 dev_err(ufs_qcom_phy->dev, "%s: is_physical_coding_sublayer_ready() callback is not supported\n",
 594                         __func__);
 595                 return -ENOTSUPP;
 596         }
 597
 598         return ufs_qcom_phy->phy_spec_ops->
 599                         is_physical_coding_sublayer_ready(ufs_qcom_phy);
 600 }
 601 EXPORT_SYMBOL_GPL(ufs_qcom_phy_is_pcs_ready);
 602
 603 int ufs_qcom_phy_power_on(struct phy *generic_phy)
 604 {
 605         struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
 606         struct device *dev = phy_common->dev;
 607         int err;
 608
 609         if (phy_common->is_powered_on)
 610                 return 0;
 611
 612         err = ufs_qcom_phy_enable_vreg(dev, &phy_common->vdda_phy);
 613         if (err) {
 614                 dev_err(dev, "%s enable vdda_phy failed, err=%d\n",
 615                         __func__, err);
 616                 goto out;
 617         }
 618
 619         phy_common->phy_spec_ops->power_control(phy_common, true);
 620
 621         /* vdda_pll also enables ref clock LDOs so enable it first */
 622         err = ufs_qcom_phy_enable_vreg(dev, &phy_common->vdda_pll);
 623         if (err) {
 624                 dev_err(dev, "%s enable vdda_pll failed, err=%d\n",
 625                         __func__, err);
 626                 goto out_disable_phy;
 627         }
 628
 629         err = ufs_qcom_phy_enable_iface_clk(phy_common);
 630         if (err) {
 631                 dev_err(dev, "%s enable phy iface clock failed, err=%d\n",
 632                         __func__, err);
 633                 goto out_disable_pll;
 634         }
 635
 636         err = ufs_qcom_phy_enable_ref_clk(phy_common);
 637         if (err) {
 638                 dev_err(dev, "%s enable phy ref clock failed, err=%d\n",
 639                         __func__, err);
 640                 goto out_disable_iface_clk;
 641         }
 642
 643         /* enable device PHY ref_clk pad rail */
 644         if (phy_common->vddp_ref_clk.reg) {
 645                 err = ufs_qcom_phy_enable_vreg(dev,
 646                                                &phy_common->vddp_ref_clk);
 647                 if (err) {
 648                         dev_err(dev, "%s enable vddp_ref_clk failed, err=%d\n",
 649                                 __func__, err);
 650                         goto out_disable_ref_clk;
 651                 }
 652         }
 653
 654         phy_common->is_powered_on = true;
 655         goto out;
 656
 657 out_disable_ref_clk:
 658         ufs_qcom_phy_disable_ref_clk(phy_common);
 659 out_disable_iface_clk:
 660         ufs_qcom_phy_disable_iface_clk(phy_common);
 661 out_disable_pll:
 662         ufs_qcom_phy_disable_vreg(dev, &phy_common->vdda_pll);
 663 out_disable_phy:
 664         ufs_qcom_phy_disable_vreg(dev, &phy_common->vdda_phy);
 665 out:
 666         return err;
 667 }
 668 EXPORT_SYMBOL_GPL(ufs_qcom_phy_power_on);
 669
 670 int ufs_qcom_phy_power_off(struct phy *generic_phy)
 671 {
 672         struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
 673
 674         if (!phy_common->is_powered_on)
 675                 return 0;
 676
 677         phy_common->phy_spec_ops->power_control(phy_common, false);
 678
 679         if (phy_common->vddp_ref_clk.reg)
 680                 ufs_qcom_phy_disable_vreg(phy_common->dev,
 681                                           &phy_common->vddp_ref_clk);
 682         ufs_qcom_phy_disable_ref_clk(phy_common);
 683         ufs_qcom_phy_disable_iface_clk(phy_common);
 684
 685         ufs_qcom_phy_disable_vreg(phy_common->dev, &phy_common->vdda_pll);
 686         ufs_qcom_phy_disable_vreg(phy_common->dev, &phy_common->vdda_phy);
 687         phy_common->is_powered_on = false;
 688
 689         return 0;
 690 }
 691 EXPORT_SYMBOL_GPL(ufs_qcom_phy_power_off);
 692
 693 MODULE_AUTHOR("Yaniv Gardi <ygardi@codeaurora.org>");
 694 MODULE_AUTHOR("Vivek Gautam <vivek.gautam@codeaurora.org>");
 695 MODULE_DESCRIPTION("Universal Flash Storage (UFS) QCOM PHY");
 696 MODULE_LICENSE("GPL v2");