drivers/phy/tegra/xusb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014-2016, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #include <linux/delay.h>
   7 #include <linux/io.h>
   8 #include <linux/mailbox_client.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/phy/phy.h>
  13 #include <linux/phy/tegra/xusb.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/reset.h>
  17 #include <linux/slab.h>
  18 #include <linux/workqueue.h>
  19
  20 #include <soc/tegra/fuse.h>
  21
  22 #include "xusb.h"
  23
  24 static struct phy *tegra_xusb_pad_of_xlate(struct device *dev,
  25                                            struct of_phandle_args *args)
  26 {
  27         struct tegra_xusb_pad *pad = dev_get_drvdata(dev);
  28         struct phy *phy = NULL;
  29         unsigned int i;
  30
  31         if (args->args_count != 0)
  32                 return ERR_PTR(-EINVAL);
  33
  34         for (i = 0; i < pad->soc->num_lanes; i++) {
  35                 if (!pad->lanes[i])
  36                         continue;
  37
  38                 if (pad->lanes[i]->dev.of_node == args->np) {
  39                         phy = pad->lanes[i];
  40                         break;
  41                 }
  42         }
  43
  44         if (phy == NULL)
  45                 phy = ERR_PTR(-ENODEV);
  46
  47         return phy;
  48 }
  49
  50 static const struct of_device_id tegra_xusb_padctl_of_match[] = {
  51 #if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC)
  52         {
  53                 .compatible = "nvidia,tegra124-xusb-padctl",
  54                 .data = &tegra124_xusb_padctl_soc,
  55         },
  56 #endif
  57 #if defined(CONFIG_ARCH_TEGRA_210_SOC)
  58         {
  59                 .compatible = "nvidia,tegra210-xusb-padctl",
  60                 .data = &tegra210_xusb_padctl_soc,
  61         },
  62 #endif
  63 #if defined(CONFIG_ARCH_TEGRA_186_SOC)
  64         {
  65                 .compatible = "nvidia,tegra186-xusb-padctl",
  66                 .data = &tegra186_xusb_padctl_soc,
  67         },
  68 #endif
  69 #if defined(CONFIG_ARCH_TEGRA_194_SOC)
  70         {
  71                 .compatible = "nvidia,tegra194-xusb-padctl",
  72                 .data = &tegra194_xusb_padctl_soc,
  73         },
  74 #endif
  75         { }
  76 };
  77 MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match);
  78
  79 static struct device_node *
  80 tegra_xusb_find_pad_node(struct tegra_xusb_padctl *padctl, const char *name)
  81 {
  82         struct device_node *pads, *np;
  83
  84         pads = of_get_child_by_name(padctl->dev->of_node, "pads");
  85         if (!pads)
  86                 return NULL;
  87
  88         np = of_get_child_by_name(pads, name);
  89         of_node_put(pads);
  90
  91         return np;
  92 }
  93
  94 static struct device_node *
  95 tegra_xusb_pad_find_phy_node(struct tegra_xusb_pad *pad, unsigned int index)
  96 {
  97         struct device_node *np, *lanes;
  98
  99         lanes = of_get_child_by_name(pad->dev.of_node, "lanes");
 100         if (!lanes)
 101                 return NULL;
 102
 103         np = of_get_child_by_name(lanes, pad->soc->lanes[index].name);
 104         of_node_put(lanes);
 105
 106         return np;
 107 }
 108
 109 int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
 110                              struct device_node *np)
 111 {
 112         struct device *dev = &lane->pad->dev;
 113         const char *function;
 114         int err;
 115
 116         err = of_property_read_string(np, "nvidia,function", &function);
 117         if (err < 0)
 118                 return err;
 119
 120         err = match_string(lane->soc->funcs, lane->soc->num_funcs, function);
 121         if (err < 0) {
 122                 dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n",
 123                         function, np);
 124                 return err;
 125         }
 126
 127         lane->function = err;
 128
 129         return 0;
 130 }
 131
 132 static void tegra_xusb_lane_destroy(struct phy *phy)
 133 {
 134         if (phy) {
 135                 struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
 136
 137                 lane->pad->ops->remove(lane);
 138                 phy_destroy(phy);
 139         }
 140 }
 141
 142 static void tegra_xusb_pad_release(struct device *dev)
 143 {
 144         struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev);
 145
 146         pad->soc->ops->remove(pad);
 147 }
 148
 149 static const struct device_type tegra_xusb_pad_type = {
 150         .release = tegra_xusb_pad_release,
 151 };
 152
 153 int tegra_xusb_pad_init(struct tegra_xusb_pad *pad,
 154                         struct tegra_xusb_padctl *padctl,
 155                         struct device_node *np)
 156 {
 157         int err;
 158
 159         device_initialize(&pad->dev);
 160         INIT_LIST_HEAD(&pad->list);
 161         pad->dev.parent = padctl->dev;
 162         pad->dev.type = &tegra_xusb_pad_type;
 163         pad->dev.of_node = np;
 164         pad->padctl = padctl;
 165
 166         err = dev_set_name(&pad->dev, "%s", pad->soc->name);
 167         if (err < 0)
 168                 goto unregister;
 169
 170         err = device_add(&pad->dev);
 171         if (err < 0)
 172                 goto unregister;
 173
 174         return 0;
 175
 176 unregister:
 177         device_unregister(&pad->dev);
 178         return err;
 179 }
 180
 181 int tegra_xusb_pad_register(struct tegra_xusb_pad *pad,
 182                             const struct phy_ops *ops)
 183 {
 184         struct device_node *children;
 185         struct phy *lane;
 186         unsigned int i;
 187         int err;
 188
 189         children = of_get_child_by_name(pad->dev.of_node, "lanes");
 190         if (!children)
 191                 return -ENODEV;
 192
 193         pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane),
 194                                   GFP_KERNEL);
 195         if (!pad->lanes) {
 196                 of_node_put(children);
 197                 return -ENOMEM;
 198         }
 199
 200         for (i = 0; i < pad->soc->num_lanes; i++) {
 201                 struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i);
 202                 struct tegra_xusb_lane *lane;
 203
 204                 /* skip disabled lanes */
 205                 if (!np || !of_device_is_available(np)) {
 206                         of_node_put(np);
 207                         continue;
 208                 }
 209
 210                 pad->lanes[i] = phy_create(&pad->dev, np, ops);
 211                 if (IS_ERR(pad->lanes[i])) {
 212                         err = PTR_ERR(pad->lanes[i]);
 213                         of_node_put(np);
 214                         goto remove;
 215                 }
 216
 217                 lane = pad->ops->probe(pad, np, i);
 218                 if (IS_ERR(lane)) {
 219                         phy_destroy(pad->lanes[i]);
 220                         err = PTR_ERR(lane);
 221                         goto remove;
 222                 }
 223
 224                 list_add_tail(&lane->list, &pad->padctl->lanes);
 225                 phy_set_drvdata(pad->lanes[i], lane);
 226         }
 227
 228         pad->provider = of_phy_provider_register_full(&pad->dev, children,
 229                                                       tegra_xusb_pad_of_xlate);
 230         if (IS_ERR(pad->provider)) {
 231                 err = PTR_ERR(pad->provider);
 232                 goto remove;
 233         }
 234
 235         return 0;
 236
 237 remove:
 238         while (i--)
 239                 tegra_xusb_lane_destroy(pad->lanes[i]);
 240
 241         of_node_put(children);
 242
 243         return err;
 244 }
 245
 246 void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad)
 247 {
 248         unsigned int i = pad->soc->num_lanes;
 249
 250         of_phy_provider_unregister(pad->provider);
 251
 252         while (i--)
 253                 tegra_xusb_lane_destroy(pad->lanes[i]);
 254
 255         device_unregister(&pad->dev);
 256 }
 257
 258 static struct tegra_xusb_pad *
 259 tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl,
 260                       const struct tegra_xusb_pad_soc *soc)
 261 {
 262         struct tegra_xusb_pad *pad;
 263         struct device_node *np;
 264         int err;
 265
 266         np = tegra_xusb_find_pad_node(padctl, soc->name);
 267         if (!np || !of_device_is_available(np))
 268                 return NULL;
 269
 270         pad = soc->ops->probe(padctl, soc, np);
 271         if (IS_ERR(pad)) {
 272                 err = PTR_ERR(pad);
 273                 dev_err(padctl->dev, "failed to create pad %s: %d\n",
 274                         soc->name, err);
 275                 return ERR_PTR(err);
 276         }
 277
 278         /* XXX move this into ->probe() to avoid string comparison */
 279         if (strcmp(soc->name, "pcie") == 0)
 280                 padctl->pcie = pad;
 281
 282         if (strcmp(soc->name, "sata") == 0)
 283                 padctl->sata = pad;
 284
 285         if (strcmp(soc->name, "usb2") == 0)
 286                 padctl->usb2 = pad;
 287
 288         if (strcmp(soc->name, "ulpi") == 0)
 289                 padctl->ulpi = pad;
 290
 291         if (strcmp(soc->name, "hsic") == 0)
 292                 padctl->hsic = pad;
 293
 294         return pad;
 295 }
 296
 297 static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
 298 {
 299         struct tegra_xusb_pad *pad, *tmp;
 300
 301         list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) {
 302                 list_del(&pad->list);
 303                 tegra_xusb_pad_unregister(pad);
 304         }
 305 }
 306
 307 static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
 308 {
 309         mutex_lock(&padctl->lock);
 310         __tegra_xusb_remove_pads(padctl);
 311         mutex_unlock(&padctl->lock);
 312 }
 313
 314 static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
 315 {
 316         struct tegra_xusb_padctl *padctl = lane->pad->padctl;
 317         const struct tegra_xusb_lane_soc *soc = lane->soc;
 318         u32 value;
 319
 320         /* skip single function lanes */
 321         if (soc->num_funcs < 2)
 322                 return;
 323
 324         /* choose function */
 325         value = padctl_readl(padctl, soc->offset);
 326         value &= ~(soc->mask << soc->shift);
 327         value |= lane->function << soc->shift;
 328         padctl_writel(padctl, value, soc->offset);
 329 }
 330
 331 static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad)
 332 {
 333         unsigned int i;
 334
 335         for (i = 0; i < pad->soc->num_lanes; i++) {
 336                 struct tegra_xusb_lane *lane;
 337
 338                 if (pad->lanes[i]) {
 339                         lane = phy_get_drvdata(pad->lanes[i]);
 340                         tegra_xusb_lane_program(lane);
 341                 }
 342         }
 343 }
 344
 345 static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl)
 346 {
 347         struct tegra_xusb_pad *pad;
 348         unsigned int i;
 349
 350         mutex_lock(&padctl->lock);
 351
 352         for (i = 0; i < padctl->soc->num_pads; i++) {
 353                 const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i];
 354                 int err;
 355
 356                 pad = tegra_xusb_pad_create(padctl, soc);
 357                 if (IS_ERR(pad)) {
 358                         err = PTR_ERR(pad);
 359                         dev_err(padctl->dev, "failed to create pad %s: %d\n",
 360                                 soc->name, err);
 361                         __tegra_xusb_remove_pads(padctl);
 362                         mutex_unlock(&padctl->lock);
 363                         return err;
 364                 }
 365
 366                 if (!pad)
 367                         continue;
 368
 369                 list_add_tail(&pad->list, &padctl->pads);
 370         }
 371
 372         list_for_each_entry(pad, &padctl->pads, list)
 373                 tegra_xusb_pad_program(pad);
 374
 375         mutex_unlock(&padctl->lock);
 376         return 0;
 377 }
 378
 379 static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane,
 380                                   const char *function)
 381 {
 382         const char *func = lane->soc->funcs[lane->function];
 383
 384         return strcmp(function, func) == 0;
 385 }
 386
 387 struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl,
 388                                              const char *type,
 389                                              unsigned int index)
 390 {
 391         struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV);
 392         char *name;
 393
 394         name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
 395         if (!name)
 396                 return ERR_PTR(-ENOMEM);
 397
 398         list_for_each_entry(lane, &padctl->lanes, list) {
 399                 if (strcmp(lane->soc->name, name) == 0) {
 400                         hit = lane;
 401                         break;
 402                 }
 403         }
 404
 405         kfree(name);
 406         return hit;
 407 }
 408
 409 struct tegra_xusb_lane *
 410 tegra_xusb_port_find_lane(struct tegra_xusb_port *port,
 411                           const struct tegra_xusb_lane_map *map,
 412                           const char *function)
 413 {
 414         struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV);
 415
 416         for (; map->type; map++) {
 417                 if (port->index != map->port)
 418                         continue;
 419
 420                 lane = tegra_xusb_find_lane(port->padctl, map->type,
 421                                             map->index);
 422                 if (IS_ERR(lane))
 423                         continue;
 424
 425                 if (!tegra_xusb_lane_check(lane, function))
 426                         continue;
 427
 428                 if (!IS_ERR(match))
 429                         dev_err(&port->dev, "conflicting match: %s-%u / %s\n",
 430                                 map->type, map->index, match->soc->name);
 431                 else
 432                         match = lane;
 433         }
 434
 435         return match;
 436 }
 437
 438 static struct device_node *
 439 tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type,
 440                           unsigned int index)
 441 {
 442         struct device_node *ports, *np;
 443         char *name;
 444
 445         ports = of_get_child_by_name(padctl->dev->of_node, "ports");
 446         if (!ports)
 447                 return NULL;
 448
 449         name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
 450         if (!name) {
 451                 of_node_put(ports);
 452                 return ERR_PTR(-ENOMEM);
 453         }
 454         np = of_get_child_by_name(ports, name);
 455         kfree(name);
 456         of_node_put(ports);
 457
 458         return np;
 459 }
 460
 461 struct tegra_xusb_port *
 462 tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type,
 463                      unsigned int index)
 464 {
 465         struct tegra_xusb_port *port;
 466         struct device_node *np;
 467
 468         np = tegra_xusb_find_port_node(padctl, type, index);
 469         if (!np)
 470                 return NULL;
 471
 472         list_for_each_entry(port, &padctl->ports, list) {
 473                 if (np == port->dev.of_node) {
 474                         of_node_put(np);
 475                         return port;
 476                 }
 477         }
 478
 479         of_node_put(np);
 480
 481         return NULL;
 482 }
 483
 484 struct tegra_xusb_usb2_port *
 485 tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index)
 486 {
 487         struct tegra_xusb_port *port;
 488
 489         port = tegra_xusb_find_port(padctl, "usb2", index);
 490         if (port)
 491                 return to_usb2_port(port);
 492
 493         return NULL;
 494 }
 495
 496 struct tegra_xusb_usb3_port *
 497 tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index)
 498 {
 499         struct tegra_xusb_port *port;
 500
 501         port = tegra_xusb_find_port(padctl, "usb3", index);
 502         if (port)
 503                 return to_usb3_port(port);
 504
 505         return NULL;
 506 }
 507
 508 static void tegra_xusb_port_release(struct device *dev)
 509 {
 510         struct tegra_xusb_port *port = to_tegra_xusb_port(dev);
 511
 512         if (port->ops->release)
 513                 port->ops->release(port);
 514 }
 515
 516 static const struct device_type tegra_xusb_port_type = {
 517         .release = tegra_xusb_port_release,
 518 };
 519
 520 static int tegra_xusb_port_init(struct tegra_xusb_port *port,
 521                                 struct tegra_xusb_padctl *padctl,
 522                                 struct device_node *np,
 523                                 const char *name,
 524                                 unsigned int index)
 525 {
 526         int err;
 527
 528         INIT_LIST_HEAD(&port->list);
 529         port->padctl = padctl;
 530         port->index = index;
 531
 532         device_initialize(&port->dev);
 533         port->dev.type = &tegra_xusb_port_type;
 534         port->dev.of_node = of_node_get(np);
 535         port->dev.parent = padctl->dev;
 536
 537         err = dev_set_name(&port->dev, "%s-%u", name, index);
 538         if (err < 0)
 539                 goto unregister;
 540
 541         err = device_add(&port->dev);
 542         if (err < 0)
 543                 goto unregister;
 544
 545         return 0;
 546
 547 unregister:
 548         device_unregister(&port->dev);
 549         return err;
 550 }
 551
 552 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
 553 {
 554         if (!IS_ERR_OR_NULL(port->usb_role_sw)) {
 555                 of_platform_depopulate(&port->dev);
 556                 usb_role_switch_unregister(port->usb_role_sw);
 557                 cancel_work_sync(&port->usb_phy_work);
 558                 usb_remove_phy(&port->usb_phy);
 559         }
 560
 561         if (port->ops->remove)
 562                 port->ops->remove(port);
 563
 564         device_unregister(&port->dev);
 565 }
 566
 567 static const char *const modes[] = {
 568         [USB_DR_MODE_UNKNOWN] = "",
 569         [USB_DR_MODE_HOST] = "host",
 570         [USB_DR_MODE_PERIPHERAL] = "peripheral",
 571         [USB_DR_MODE_OTG] = "otg",
 572 };
 573
 574 static const char * const usb_roles[] = {
 575         [USB_ROLE_NONE]         = "none",
 576         [USB_ROLE_HOST]         = "host",
 577         [USB_ROLE_DEVICE]       = "device",
 578 };
 579
 580 static enum usb_phy_events to_usb_phy_event(enum usb_role role)
 581 {
 582         switch (role) {
 583         case USB_ROLE_DEVICE:
 584                 return USB_EVENT_VBUS;
 585
 586         case USB_ROLE_HOST:
 587                 return USB_EVENT_ID;
 588
 589         default:
 590                 return USB_EVENT_NONE;
 591         }
 592 }
 593
 594 static void tegra_xusb_usb_phy_work(struct work_struct *work)
 595 {
 596         struct tegra_xusb_port *port = container_of(work,
 597                                                     struct tegra_xusb_port,
 598                                                     usb_phy_work);
 599         enum usb_role role = usb_role_switch_get_role(port->usb_role_sw);
 600
 601         usb_phy_set_event(&port->usb_phy, to_usb_phy_event(role));
 602
 603         dev_dbg(&port->dev, "%s(): calling notifier for role %s\n", __func__,
 604                 usb_roles[role]);
 605
 606         atomic_notifier_call_chain(&port->usb_phy.notifier, 0, &port->usb_phy);
 607 }
 608
 609 static int tegra_xusb_role_sw_set(struct usb_role_switch *sw,
 610                                   enum usb_role role)
 611 {
 612         struct tegra_xusb_port *port = usb_role_switch_get_drvdata(sw);
 613
 614         dev_dbg(&port->dev, "%s(): role %s\n", __func__, usb_roles[role]);
 615
 616         schedule_work(&port->usb_phy_work);
 617
 618         return 0;
 619 }
 620
 621 static int tegra_xusb_set_peripheral(struct usb_otg *otg,
 622                                      struct usb_gadget *gadget)
 623 {
 624         struct tegra_xusb_port *port = container_of(otg->usb_phy,
 625                                                     struct tegra_xusb_port,
 626                                                     usb_phy);
 627
 628         if (gadget != NULL)
 629                 schedule_work(&port->usb_phy_work);
 630
 631         return 0;
 632 }
 633
 634 static int tegra_xusb_set_host(struct usb_otg *otg, struct usb_bus *host)
 635 {
 636         struct tegra_xusb_port *port = container_of(otg->usb_phy,
 637                                                     struct tegra_xusb_port,
 638                                                     usb_phy);
 639
 640         if (host != NULL)
 641                 schedule_work(&port->usb_phy_work);
 642
 643         return 0;
 644 }
 645
 646
 647 static int tegra_xusb_setup_usb_role_switch(struct tegra_xusb_port *port)
 648 {
 649         struct tegra_xusb_lane *lane;
 650         struct usb_role_switch_desc role_sx_desc = {
 651                 .fwnode = dev_fwnode(&port->dev),
 652                 .set = tegra_xusb_role_sw_set,
 653         };
 654         int err = 0;
 655
 656         /*
 657          * USB role switch driver needs parent driver owner info. This is a
 658          * suboptimal solution. TODO: Need to revisit this in a follow-up patch
 659          * where an optimal solution is possible with changes to USB role
 660          * switch driver.
 661          */
 662         port->dev.driver = devm_kzalloc(&port->dev,
 663                                         sizeof(struct device_driver),
 664                                         GFP_KERNEL);
 665         port->dev.driver->owner  = THIS_MODULE;
 666
 667         port->usb_role_sw = usb_role_switch_register(&port->dev,
 668                                                      &role_sx_desc);
 669         if (IS_ERR(port->usb_role_sw)) {
 670                 err = PTR_ERR(port->usb_role_sw);
 671                 dev_err(&port->dev, "failed to register USB role switch: %d",
 672                         err);
 673                 return err;
 674         }
 675
 676         INIT_WORK(&port->usb_phy_work, tegra_xusb_usb_phy_work);
 677         usb_role_switch_set_drvdata(port->usb_role_sw, port);
 678
 679         port->usb_phy.otg = devm_kzalloc(&port->dev, sizeof(struct usb_otg),
 680                                          GFP_KERNEL);
 681         if (!port->usb_phy.otg)
 682                 return -ENOMEM;
 683
 684         lane = tegra_xusb_find_lane(port->padctl, "usb2", port->index);
 685
 686         /*
 687          * Assign phy dev to usb-phy dev. Host/device drivers can use phy
 688          * reference to retrieve usb-phy details.
 689          */
 690         port->usb_phy.dev = &lane->pad->lanes[port->index]->dev;
 691         port->usb_phy.dev->driver = port->dev.driver;
 692         port->usb_phy.otg->usb_phy = &port->usb_phy;
 693         port->usb_phy.otg->set_peripheral = tegra_xusb_set_peripheral;
 694         port->usb_phy.otg->set_host = tegra_xusb_set_host;
 695
 696         err = usb_add_phy_dev(&port->usb_phy);
 697         if (err < 0) {
 698                 dev_err(&port->dev, "Failed to add USB PHY: %d\n", err);
 699                 return err;
 700         }
 701
 702         /* populate connector entry */
 703         of_platform_populate(port->dev.of_node, NULL, NULL, &port->dev);
 704
 705         return err;
 706 }
 707
 708 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
 709 {
 710         struct tegra_xusb_port *port = &usb2->base;
 711         struct device_node *np = port->dev.of_node;
 712         const char *mode;
 713         int err;
 714
 715         usb2->internal = of_property_read_bool(np, "nvidia,internal");
 716
 717         if (!of_property_read_string(np, "mode", &mode)) {
 718                 int err = match_string(modes, ARRAY_SIZE(modes), mode);
 719                 if (err < 0) {
 720                         dev_err(&port->dev, "invalid value %s for \"mode\"\n",
 721                                 mode);
 722                         usb2->mode = USB_DR_MODE_UNKNOWN;
 723                 } else {
 724                         usb2->mode = err;
 725                 }
 726         } else {
 727                 usb2->mode = USB_DR_MODE_HOST;
 728         }
 729
 730         /* usb-role-switch property is mandatory for OTG/Peripheral modes */
 731         if (usb2->mode == USB_DR_MODE_PERIPHERAL ||
 732             usb2->mode == USB_DR_MODE_OTG) {
 733                 if (of_property_read_bool(np, "usb-role-switch")) {
 734                         err = tegra_xusb_setup_usb_role_switch(port);
 735                         if (err < 0)
 736                                 return err;
 737                 } else {
 738                         dev_err(&port->dev, "usb-role-switch not found for %s mode",
 739                                 modes[usb2->mode]);
 740                         return -EINVAL;
 741                 }
 742         }
 743
 744         usb2->supply = regulator_get(&port->dev, "vbus");
 745         return PTR_ERR_OR_ZERO(usb2->supply);
 746 }
 747
 748 static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl,
 749                                     unsigned int index)
 750 {
 751         struct tegra_xusb_usb2_port *usb2;
 752         struct device_node *np;
 753         int err = 0;
 754
 755         /*
 756          * USB2 ports don't require additional properties, but if the port is
 757          * marked as disabled there is no reason to register it.
 758          */
 759         np = tegra_xusb_find_port_node(padctl, "usb2", index);
 760         if (!np || !of_device_is_available(np))
 761                 goto out;
 762
 763         usb2 = kzalloc(sizeof(*usb2), GFP_KERNEL);
 764         if (!usb2) {
 765                 err = -ENOMEM;
 766                 goto out;
 767         }
 768
 769         err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index);
 770         if (err < 0)
 771                 goto out;
 772
 773         usb2->base.ops = padctl->soc->ports.usb2.ops;
 774
 775         usb2->base.lane = usb2->base.ops->map(&usb2->base);
 776         if (IS_ERR(usb2->base.lane)) {
 777                 err = PTR_ERR(usb2->base.lane);
 778                 goto out;
 779         }
 780
 781         err = tegra_xusb_usb2_port_parse_dt(usb2);
 782         if (err < 0) {
 783                 tegra_xusb_port_unregister(&usb2->base);
 784                 goto out;
 785         }
 786
 787         list_add_tail(&usb2->base.list, &padctl->ports);
 788
 789 out:
 790         of_node_put(np);
 791         return err;
 792 }
 793
 794 void tegra_xusb_usb2_port_release(struct tegra_xusb_port *port)
 795 {
 796         struct tegra_xusb_usb2_port *usb2 = to_usb2_port(port);
 797
 798         kfree(usb2);
 799 }
 800
 801 void tegra_xusb_usb2_port_remove(struct tegra_xusb_port *port)
 802 {
 803         struct tegra_xusb_usb2_port *usb2 = to_usb2_port(port);
 804
 805         regulator_put(usb2->supply);
 806 }
 807
 808 static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi)
 809 {
 810         struct tegra_xusb_port *port = &ulpi->base;
 811         struct device_node *np = port->dev.of_node;
 812
 813         ulpi->internal = of_property_read_bool(np, "nvidia,internal");
 814
 815         return 0;
 816 }
 817
 818 static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl,
 819                                     unsigned int index)
 820 {
 821         struct tegra_xusb_ulpi_port *ulpi;
 822         struct device_node *np;
 823         int err = 0;
 824
 825         np = tegra_xusb_find_port_node(padctl, "ulpi", index);
 826         if (!np || !of_device_is_available(np))
 827                 goto out;
 828
 829         ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL);
 830         if (!ulpi) {
 831                 err = -ENOMEM;
 832                 goto out;
 833         }
 834
 835         err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index);
 836         if (err < 0)
 837                 goto out;
 838
 839         ulpi->base.ops = padctl->soc->ports.ulpi.ops;
 840
 841         ulpi->base.lane = ulpi->base.ops->map(&ulpi->base);
 842         if (IS_ERR(ulpi->base.lane)) {
 843                 err = PTR_ERR(ulpi->base.lane);
 844                 goto out;
 845         }
 846
 847         err = tegra_xusb_ulpi_port_parse_dt(ulpi);
 848         if (err < 0) {
 849                 tegra_xusb_port_unregister(&ulpi->base);
 850                 goto out;
 851         }
 852
 853         list_add_tail(&ulpi->base.list, &padctl->ports);
 854
 855 out:
 856         of_node_put(np);
 857         return err;
 858 }
 859
 860 void tegra_xusb_ulpi_port_release(struct tegra_xusb_port *port)
 861 {
 862         struct tegra_xusb_ulpi_port *ulpi = to_ulpi_port(port);
 863
 864         kfree(ulpi);
 865 }
 866
 867 static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic)
 868 {
 869         /* XXX */
 870         return 0;
 871 }
 872
 873 static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl,
 874                                     unsigned int index)
 875 {
 876         struct tegra_xusb_hsic_port *hsic;
 877         struct device_node *np;
 878         int err = 0;
 879
 880         np = tegra_xusb_find_port_node(padctl, "hsic", index);
 881         if (!np || !of_device_is_available(np))
 882                 goto out;
 883
 884         hsic = kzalloc(sizeof(*hsic), GFP_KERNEL);
 885         if (!hsic) {
 886                 err = -ENOMEM;
 887                 goto out;
 888         }
 889
 890         err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index);
 891         if (err < 0)
 892                 goto out;
 893
 894         hsic->base.ops = padctl->soc->ports.hsic.ops;
 895
 896         hsic->base.lane = hsic->base.ops->map(&hsic->base);
 897         if (IS_ERR(hsic->base.lane)) {
 898                 err = PTR_ERR(hsic->base.lane);
 899                 goto out;
 900         }
 901
 902         err = tegra_xusb_hsic_port_parse_dt(hsic);
 903         if (err < 0) {
 904                 tegra_xusb_port_unregister(&hsic->base);
 905                 goto out;
 906         }
 907
 908         list_add_tail(&hsic->base.list, &padctl->ports);
 909
 910 out:
 911         of_node_put(np);
 912         return err;
 913 }
 914
 915 void tegra_xusb_hsic_port_release(struct tegra_xusb_port *port)
 916 {
 917         struct tegra_xusb_hsic_port *hsic = to_hsic_port(port);
 918
 919         kfree(hsic);
 920 }
 921
 922 static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3)
 923 {
 924         struct tegra_xusb_port *port = &usb3->base;
 925         struct device_node *np = port->dev.of_node;
 926         enum usb_device_speed maximum_speed;
 927         u32 value;
 928         int err;
 929
 930         err = of_property_read_u32(np, "nvidia,usb2-companion", &value);
 931         if (err < 0) {
 932                 dev_err(&port->dev, "failed to read port: %d\n", err);
 933                 return err;
 934         }
 935
 936         usb3->port = value;
 937
 938         usb3->internal = of_property_read_bool(np, "nvidia,internal");
 939
 940         if (device_property_present(&port->dev, "maximum-speed")) {
 941                 maximum_speed =  usb_get_maximum_speed(&port->dev);
 942                 if (maximum_speed == USB_SPEED_SUPER)
 943                         usb3->disable_gen2 = true;
 944                 else if (maximum_speed == USB_SPEED_SUPER_PLUS)
 945                         usb3->disable_gen2 = false;
 946                 else
 947                         return -EINVAL;
 948         }
 949
 950         usb3->supply = regulator_get(&port->dev, "vbus");
 951         return PTR_ERR_OR_ZERO(usb3->supply);
 952 }
 953
 954 static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl,
 955                                     unsigned int index)
 956 {
 957         struct tegra_xusb_usb3_port *usb3;
 958         struct device_node *np;
 959         int err = 0;
 960
 961         /*
 962          * If there is no supplemental configuration in the device tree the
 963          * port is unusable. But it is valid to configure only a single port,
 964          * hence return 0 instead of an error to allow ports to be optional.
 965          */
 966         np = tegra_xusb_find_port_node(padctl, "usb3", index);
 967         if (!np || !of_device_is_available(np))
 968                 goto out;
 969
 970         usb3 = kzalloc(sizeof(*usb3), GFP_KERNEL);
 971         if (!usb3) {
 972                 err = -ENOMEM;
 973                 goto out;
 974         }
 975
 976         err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index);
 977         if (err < 0)
 978                 goto out;
 979
 980         usb3->base.ops = padctl->soc->ports.usb3.ops;
 981
 982         usb3->base.lane = usb3->base.ops->map(&usb3->base);
 983         if (IS_ERR(usb3->base.lane)) {
 984                 err = PTR_ERR(usb3->base.lane);
 985                 goto out;
 986         }
 987
 988         err = tegra_xusb_usb3_port_parse_dt(usb3);
 989         if (err < 0) {
 990                 tegra_xusb_port_unregister(&usb3->base);
 991                 goto out;
 992         }
 993
 994         list_add_tail(&usb3->base.list, &padctl->ports);
 995
 996 out:
 997         of_node_put(np);
 998         return err;
 999 }
1000
1001 void tegra_xusb_usb3_port_release(struct tegra_xusb_port *port)
1002 {
1003         struct tegra_xusb_usb3_port *usb3 = to_usb3_port(port);
1004
1005         kfree(usb3);
1006 }
1007
1008 void tegra_xusb_usb3_port_remove(struct tegra_xusb_port *port)
1009 {
1010         struct tegra_xusb_usb3_port *usb3 = to_usb3_port(port);
1011
1012         regulator_put(usb3->supply);
1013 }
1014
1015 static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
1016 {
1017         struct tegra_xusb_port *port, *tmp;
1018
1019         list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) {
1020                 list_del(&port->list);
1021                 tegra_xusb_port_unregister(port);
1022         }
1023 }
1024
1025 static int tegra_xusb_find_unused_usb3_port(struct tegra_xusb_padctl *padctl)
1026 {
1027         struct device_node *np;
1028         unsigned int i;
1029
1030         for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
1031                 np = tegra_xusb_find_port_node(padctl, "usb3", i);
1032                 if (!np || !of_device_is_available(np))
1033                         return i;
1034         }
1035
1036         return -ENODEV;
1037 }
1038
1039 static bool tegra_xusb_port_is_companion(struct tegra_xusb_usb2_port *usb2)
1040 {
1041         unsigned int i;
1042         struct tegra_xusb_usb3_port *usb3;
1043         struct tegra_xusb_padctl *padctl = usb2->base.padctl;
1044
1045         for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
1046                 usb3 = tegra_xusb_find_usb3_port(padctl, i);
1047                 if (usb3 && usb3->port == usb2->base.index)
1048                         return true;
1049         }
1050
1051         return false;
1052 }
1053
1054 static int tegra_xusb_update_usb3_fake_port(struct tegra_xusb_usb2_port *usb2)
1055 {
1056         int fake;
1057
1058         /* Disable usb3_port_fake usage by default and assign if needed */
1059         usb2->usb3_port_fake = -1;
1060
1061         if ((usb2->mode == USB_DR_MODE_OTG ||
1062              usb2->mode == USB_DR_MODE_PERIPHERAL) &&
1063                 !tegra_xusb_port_is_companion(usb2)) {
1064                 fake = tegra_xusb_find_unused_usb3_port(usb2->base.padctl);
1065                 if (fake < 0) {
1066                         dev_err(&usb2->base.dev, "no unused USB3 ports available\n");
1067                         return -ENODEV;
1068                 }
1069
1070                 dev_dbg(&usb2->base.dev, "Found unused usb3 port: %d\n", fake);
1071                 usb2->usb3_port_fake = fake;
1072         }
1073
1074         return 0;
1075 }
1076
1077 static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl)
1078 {
1079         struct tegra_xusb_port *port;
1080         struct tegra_xusb_usb2_port *usb2;
1081         unsigned int i;
1082         int err = 0;
1083
1084         mutex_lock(&padctl->lock);
1085
1086         for (i = 0; i < padctl->soc->ports.usb2.count; i++) {
1087                 err = tegra_xusb_add_usb2_port(padctl, i);
1088                 if (err < 0)
1089                         goto remove_ports;
1090         }
1091
1092         for (i = 0; i < padctl->soc->ports.ulpi.count; i++) {
1093                 err = tegra_xusb_add_ulpi_port(padctl, i);
1094                 if (err < 0)
1095                         goto remove_ports;
1096         }
1097
1098         for (i = 0; i < padctl->soc->ports.hsic.count; i++) {
1099                 err = tegra_xusb_add_hsic_port(padctl, i);
1100                 if (err < 0)
1101                         goto remove_ports;
1102         }
1103
1104         for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
1105                 err = tegra_xusb_add_usb3_port(padctl, i);
1106                 if (err < 0)
1107                         goto remove_ports;
1108         }
1109
1110         if (padctl->soc->need_fake_usb3_port) {
1111                 for (i = 0; i < padctl->soc->ports.usb2.count; i++) {
1112                         usb2 = tegra_xusb_find_usb2_port(padctl, i);
1113                         if (!usb2)
1114                                 continue;
1115
1116                         err = tegra_xusb_update_usb3_fake_port(usb2);
1117                         if (err < 0)
1118                                 goto remove_ports;
1119                 }
1120         }
1121
1122         list_for_each_entry(port, &padctl->ports, list) {
1123                 err = port->ops->enable(port);
1124                 if (err < 0)
1125                         dev_err(padctl->dev, "failed to enable port %s: %d\n",
1126                                 dev_name(&port->dev), err);
1127         }
1128
1129         goto unlock;
1130
1131 remove_ports:
1132         __tegra_xusb_remove_ports(padctl);
1133 unlock:
1134         mutex_unlock(&padctl->lock);
1135         return err;
1136 }
1137
1138 static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
1139 {
1140         mutex_lock(&padctl->lock);
1141         __tegra_xusb_remove_ports(padctl);
1142         mutex_unlock(&padctl->lock);
1143 }
1144
1145 static int tegra_xusb_padctl_probe(struct platform_device *pdev)
1146 {
1147         struct device_node *np = pdev->dev.of_node;
1148         const struct tegra_xusb_padctl_soc *soc;
1149         struct tegra_xusb_padctl *padctl;
1150         const struct of_device_id *match;
1151         int err;
1152
1153         /* for backwards compatibility with old device trees */
1154         np = of_get_child_by_name(np, "pads");
1155         if (!np) {
1156                 dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n");
1157                 return tegra_xusb_padctl_legacy_probe(pdev);
1158         }
1159
1160         of_node_put(np);
1161
1162         match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node);
1163         soc = match->data;
1164
1165         padctl = soc->ops->probe(&pdev->dev, soc);
1166         if (IS_ERR(padctl))
1167                 return PTR_ERR(padctl);
1168
1169         platform_set_drvdata(pdev, padctl);
1170         INIT_LIST_HEAD(&padctl->ports);
1171         INIT_LIST_HEAD(&padctl->lanes);
1172         INIT_LIST_HEAD(&padctl->pads);
1173         mutex_init(&padctl->lock);
1174
1175         padctl->regs = devm_platform_ioremap_resource(pdev, 0);
1176         if (IS_ERR(padctl->regs)) {
1177                 err = PTR_ERR(padctl->regs);
1178                 goto remove;
1179         }
1180
1181         padctl->rst = devm_reset_control_get(&pdev->dev, NULL);
1182         if (IS_ERR(padctl->rst)) {
1183                 err = PTR_ERR(padctl->rst);
1184                 goto remove;
1185         }
1186
1187         padctl->supplies = devm_kcalloc(&pdev->dev, padctl->soc->num_supplies,
1188                                         sizeof(*padctl->supplies), GFP_KERNEL);
1189         if (!padctl->supplies) {
1190                 err = -ENOMEM;
1191                 goto remove;
1192         }
1193
1194         regulator_bulk_set_supply_names(padctl->supplies,
1195                                         padctl->soc->supply_names,
1196                                         padctl->soc->num_supplies);
1197
1198         err = devm_regulator_bulk_get(&pdev->dev, padctl->soc->num_supplies,
1199                                       padctl->supplies);
1200         if (err < 0) {
1201                 dev_err_probe(&pdev->dev, err, "failed to get regulators\n");
1202                 goto remove;
1203         }
1204
1205         err = reset_control_deassert(padctl->rst);
1206         if (err < 0)
1207                 goto remove;
1208
1209         err = regulator_bulk_enable(padctl->soc->num_supplies,
1210                                     padctl->supplies);
1211         if (err < 0) {
1212                 dev_err(&pdev->dev, "failed to enable supplies: %d\n", err);
1213                 goto reset;
1214         }
1215
1216         err = tegra_xusb_setup_pads(padctl);
1217         if (err < 0) {
1218                 dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
1219                 goto power_down;
1220         }
1221
1222         err = tegra_xusb_setup_ports(padctl);
1223         if (err) {
1224                 const char *level = KERN_ERR;
1225
1226                 if (err == -EPROBE_DEFER)
1227                         level = KERN_DEBUG;
1228
1229                 dev_printk(level, &pdev->dev,
1230                            dev_fmt("failed to setup XUSB ports: %d\n"), err);
1231                 goto remove_pads;
1232         }
1233
1234         return 0;
1235
1236 remove_pads:
1237         tegra_xusb_remove_pads(padctl);
1238 power_down:
1239         regulator_bulk_disable(padctl->soc->num_supplies, padctl->supplies);
1240 reset:
1241         reset_control_assert(padctl->rst);
1242 remove:
1243         platform_set_drvdata(pdev, NULL);
1244         soc->ops->remove(padctl);
1245         return err;
1246 }
1247
1248 static int tegra_xusb_padctl_remove(struct platform_device *pdev)
1249 {
1250         struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
1251         int err;
1252
1253         tegra_xusb_remove_ports(padctl);
1254         tegra_xusb_remove_pads(padctl);
1255
1256         err = regulator_bulk_disable(padctl->soc->num_supplies,
1257                                      padctl->supplies);
1258         if (err < 0)
1259                 dev_err(&pdev->dev, "failed to disable supplies: %d\n", err);
1260
1261         err = reset_control_assert(padctl->rst);
1262         if (err < 0)
1263                 dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
1264
1265         padctl->soc->ops->remove(padctl);
1266
1267         return err;
1268 }
1269
1270 static struct platform_driver tegra_xusb_padctl_driver = {
1271         .driver = {
1272                 .name = "tegra-xusb-padctl",
1273                 .of_match_table = tegra_xusb_padctl_of_match,
1274         },
1275         .probe = tegra_xusb_padctl_probe,
1276         .remove = tegra_xusb_padctl_remove,
1277 };
1278 module_platform_driver(tegra_xusb_padctl_driver);
1279
1280 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev)
1281 {
1282         struct tegra_xusb_padctl *padctl;
1283         struct platform_device *pdev;
1284         struct device_node *np;
1285
1286         np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0);
1287         if (!np)
1288                 return ERR_PTR(-EINVAL);
1289
1290         /*
1291          * This is slightly ugly. A better implementation would be to keep a
1292          * registry of pad controllers, but since there will almost certainly
1293          * only ever be one per SoC that would be a little overkill.
1294          */
1295         pdev = of_find_device_by_node(np);
1296         if (!pdev) {
1297                 of_node_put(np);
1298                 return ERR_PTR(-ENODEV);
1299         }
1300
1301         of_node_put(np);
1302
1303         padctl = platform_get_drvdata(pdev);
1304         if (!padctl) {
1305                 put_device(&pdev->dev);
1306                 return ERR_PTR(-EPROBE_DEFER);
1307         }
1308
1309         return padctl;
1310 }
1311 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get);
1312
1313 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl)
1314 {
1315         if (padctl)
1316                 put_device(padctl->dev);
1317 }
1318 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put);
1319
1320 int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl,
1321                                         unsigned int port)
1322 {
1323         if (padctl->soc->ops->usb3_save_context)
1324                 return padctl->soc->ops->usb3_save_context(padctl, port);
1325
1326         return -ENOSYS;
1327 }
1328 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context);
1329
1330 int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
1331                                     unsigned int port, bool idle)
1332 {
1333         if (padctl->soc->ops->hsic_set_idle)
1334                 return padctl->soc->ops->hsic_set_idle(padctl, port, idle);
1335
1336         return -ENOSYS;
1337 }
1338 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);
1339
1340 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
1341                                            unsigned int port, bool enable)
1342 {
1343         if (padctl->soc->ops->usb3_set_lfps_detect)
1344                 return padctl->soc->ops->usb3_set_lfps_detect(padctl, port,
1345                                                               enable);
1346
1347         return -ENOSYS;
1348 }
1349 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);
1350
1351 int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl,
1352                                                         bool val)
1353 {
1354         if (padctl->soc->ops->vbus_override)
1355                 return padctl->soc->ops->vbus_override(padctl, val);
1356
1357         return -ENOTSUPP;
1358 }
1359 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_set_vbus_override);
1360
1361 int tegra_phy_xusb_utmi_port_reset(struct phy *phy)
1362 {
1363         struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
1364         struct tegra_xusb_padctl *padctl = lane->pad->padctl;
1365
1366         if (padctl->soc->ops->utmi_port_reset)
1367                 return padctl->soc->ops->utmi_port_reset(phy);
1368
1369         return -ENOTSUPP;
1370 }
1371 EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset);
1372
1373 int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
1374                                     unsigned int port)
1375 {
1376         struct tegra_xusb_usb2_port *usb2;
1377         struct tegra_xusb_usb3_port *usb3;
1378         int i;
1379
1380         usb2 = tegra_xusb_find_usb2_port(padctl, port);
1381         if (!usb2)
1382                 return -EINVAL;
1383
1384         for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
1385                 usb3 = tegra_xusb_find_usb3_port(padctl, i);
1386                 if (usb3 && usb3->port == usb2->base.index)
1387                         return usb3->base.index;
1388         }
1389
1390         return -ENODEV;
1391 }
1392 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_usb3_companion);
1393
1394 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
1395 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
1396 MODULE_LICENSE("GPL v2");