drivers/phy/tegra/xusb.c

   1 /*
   2  * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/io.h>
  16 #include <linux/mailbox_client.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/of_device.h>
  20 #include <linux/phy/phy.h>
  21 #include <linux/phy/tegra/xusb.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/reset.h>
  25 #include <linux/slab.h>
  26 #include <linux/workqueue.h>
  27
  28 #include <soc/tegra/fuse.h>
  29
  30 #include "xusb.h"
  31
  32 static struct phy *tegra_xusb_pad_of_xlate(struct device *dev,
  33                                            struct of_phandle_args *args)
  34 {
  35         struct tegra_xusb_pad *pad = dev_get_drvdata(dev);
  36         struct phy *phy = NULL;
  37         unsigned int i;
  38
  39         if (args->args_count != 0)
  40                 return ERR_PTR(-EINVAL);
  41
  42         for (i = 0; i < pad->soc->num_lanes; i++) {
  43                 if (!pad->lanes[i])
  44                         continue;
  45
  46                 if (pad->lanes[i]->dev.of_node == args->np) {
  47                         phy = pad->lanes[i];
  48                         break;
  49                 }
  50         }
  51
  52         if (phy == NULL)
  53                 phy = ERR_PTR(-ENODEV);
  54
  55         return phy;
  56 }
  57
  58 static const struct of_device_id tegra_xusb_padctl_of_match[] = {
  59 #if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC)
  60         {
  61                 .compatible = "nvidia,tegra124-xusb-padctl",
  62                 .data = &tegra124_xusb_padctl_soc,
  63         },
  64 #endif
  65 #if defined(CONFIG_ARCH_TEGRA_210_SOC)
  66         {
  67                 .compatible = "nvidia,tegra210-xusb-padctl",
  68                 .data = &tegra210_xusb_padctl_soc,
  69         },
  70 #endif
  71         { }
  72 };
  73 MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match);
  74
  75 static struct device_node *
  76 tegra_xusb_find_pad_node(struct tegra_xusb_padctl *padctl, const char *name)
  77 {
  78         struct device_node *pads, *np;
  79
  80         pads = of_get_child_by_name(padctl->dev->of_node, "pads");
  81         if (!pads)
  82                 return NULL;
  83
  84         np = of_get_child_by_name(pads, name);
  85         of_node_put(pads);
  86
  87         return np;
  88 }
  89
  90 static struct device_node *
  91 tegra_xusb_pad_find_phy_node(struct tegra_xusb_pad *pad, unsigned int index)
  92 {
  93         struct device_node *np, *lanes;
  94
  95         lanes = of_get_child_by_name(pad->dev.of_node, "lanes");
  96         if (!lanes)
  97                 return NULL;
  98
  99         np = of_get_child_by_name(lanes, pad->soc->lanes[index].name);
 100         of_node_put(lanes);
 101
 102         return np;
 103 }
 104
 105 int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
 106                              struct device_node *np)
 107 {
 108         struct device *dev = &lane->pad->dev;
 109         const char *function;
 110         int err;
 111
 112         err = of_property_read_string(np, "nvidia,function", &function);
 113         if (err < 0)
 114                 return err;
 115
 116         err = match_string(lane->soc->funcs, lane->soc->num_funcs, function);
 117         if (err < 0) {
 118                 dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n",
 119                         function, np);
 120                 return err;
 121         }
 122
 123         lane->function = err;
 124
 125         return 0;
 126 }
 127
 128 static void tegra_xusb_lane_destroy(struct phy *phy)
 129 {
 130         if (phy) {
 131                 struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
 132
 133                 lane->pad->ops->remove(lane);
 134                 phy_destroy(phy);
 135         }
 136 }
 137
 138 static void tegra_xusb_pad_release(struct device *dev)
 139 {
 140         struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev);
 141
 142         pad->soc->ops->remove(pad);
 143 }
 144
 145 static struct device_type tegra_xusb_pad_type = {
 146         .release = tegra_xusb_pad_release,
 147 };
 148
 149 int tegra_xusb_pad_init(struct tegra_xusb_pad *pad,
 150                         struct tegra_xusb_padctl *padctl,
 151                         struct device_node *np)
 152 {
 153         int err;
 154
 155         device_initialize(&pad->dev);
 156         INIT_LIST_HEAD(&pad->list);
 157         pad->dev.parent = padctl->dev;
 158         pad->dev.type = &tegra_xusb_pad_type;
 159         pad->dev.of_node = np;
 160         pad->padctl = padctl;
 161
 162         err = dev_set_name(&pad->dev, "%s", pad->soc->name);
 163         if (err < 0)
 164                 goto unregister;
 165
 166         err = device_add(&pad->dev);
 167         if (err < 0)
 168                 goto unregister;
 169
 170         return 0;
 171
 172 unregister:
 173         device_unregister(&pad->dev);
 174         return err;
 175 }
 176
 177 int tegra_xusb_pad_register(struct tegra_xusb_pad *pad,
 178                             const struct phy_ops *ops)
 179 {
 180         struct device_node *children;
 181         struct phy *lane;
 182         unsigned int i;
 183         int err;
 184
 185         children = of_get_child_by_name(pad->dev.of_node, "lanes");
 186         if (!children)
 187                 return -ENODEV;
 188
 189         pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane),
 190                                   GFP_KERNEL);
 191         if (!pad->lanes) {
 192                 of_node_put(children);
 193                 return -ENOMEM;
 194         }
 195
 196         for (i = 0; i < pad->soc->num_lanes; i++) {
 197                 struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i);
 198                 struct tegra_xusb_lane *lane;
 199
 200                 /* skip disabled lanes */
 201                 if (!np || !of_device_is_available(np)) {
 202                         of_node_put(np);
 203                         continue;
 204                 }
 205
 206                 pad->lanes[i] = phy_create(&pad->dev, np, ops);
 207                 if (IS_ERR(pad->lanes[i])) {
 208                         err = PTR_ERR(pad->lanes[i]);
 209                         of_node_put(np);
 210                         goto remove;
 211                 }
 212
 213                 lane = pad->ops->probe(pad, np, i);
 214                 if (IS_ERR(lane)) {
 215                         phy_destroy(pad->lanes[i]);
 216                         err = PTR_ERR(lane);
 217                         goto remove;
 218                 }
 219
 220                 list_add_tail(&lane->list, &pad->padctl->lanes);
 221                 phy_set_drvdata(pad->lanes[i], lane);
 222         }
 223
 224         pad->provider = of_phy_provider_register_full(&pad->dev, children,
 225                                                       tegra_xusb_pad_of_xlate);
 226         if (IS_ERR(pad->provider)) {
 227                 err = PTR_ERR(pad->provider);
 228                 goto remove;
 229         }
 230
 231         return 0;
 232
 233 remove:
 234         while (i--)
 235                 tegra_xusb_lane_destroy(pad->lanes[i]);
 236
 237         of_node_put(children);
 238
 239         return err;
 240 }
 241
 242 void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad)
 243 {
 244         unsigned int i = pad->soc->num_lanes;
 245
 246         of_phy_provider_unregister(pad->provider);
 247
 248         while (i--)
 249                 tegra_xusb_lane_destroy(pad->lanes[i]);
 250
 251         device_unregister(&pad->dev);
 252 }
 253
 254 static struct tegra_xusb_pad *
 255 tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl,
 256                       const struct tegra_xusb_pad_soc *soc)
 257 {
 258         struct tegra_xusb_pad *pad;
 259         struct device_node *np;
 260         int err;
 261
 262         np = tegra_xusb_find_pad_node(padctl, soc->name);
 263         if (!np || !of_device_is_available(np))
 264                 return NULL;
 265
 266         pad = soc->ops->probe(padctl, soc, np);
 267         if (IS_ERR(pad)) {
 268                 err = PTR_ERR(pad);
 269                 dev_err(padctl->dev, "failed to create pad %s: %d\n",
 270                         soc->name, err);
 271                 return ERR_PTR(err);
 272         }
 273
 274         /* XXX move this into ->probe() to avoid string comparison */
 275         if (strcmp(soc->name, "pcie") == 0)
 276                 padctl->pcie = pad;
 277
 278         if (strcmp(soc->name, "sata") == 0)
 279                 padctl->sata = pad;
 280
 281         if (strcmp(soc->name, "usb2") == 0)
 282                 padctl->usb2 = pad;
 283
 284         if (strcmp(soc->name, "ulpi") == 0)
 285                 padctl->ulpi = pad;
 286
 287         if (strcmp(soc->name, "hsic") == 0)
 288                 padctl->hsic = pad;
 289
 290         return pad;
 291 }
 292
 293 static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
 294 {
 295         struct tegra_xusb_pad *pad, *tmp;
 296
 297         list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) {
 298                 list_del(&pad->list);
 299                 tegra_xusb_pad_unregister(pad);
 300         }
 301 }
 302
 303 static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
 304 {
 305         mutex_lock(&padctl->lock);
 306         __tegra_xusb_remove_pads(padctl);
 307         mutex_unlock(&padctl->lock);
 308 }
 309
 310 static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
 311 {
 312         struct tegra_xusb_padctl *padctl = lane->pad->padctl;
 313         const struct tegra_xusb_lane_soc *soc = lane->soc;
 314         u32 value;
 315
 316         /* choose function */
 317         value = padctl_readl(padctl, soc->offset);
 318         value &= ~(soc->mask << soc->shift);
 319         value |= lane->function << soc->shift;
 320         padctl_writel(padctl, value, soc->offset);
 321 }
 322
 323 static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad)
 324 {
 325         unsigned int i;
 326
 327         for (i = 0; i < pad->soc->num_lanes; i++) {
 328                 struct tegra_xusb_lane *lane;
 329
 330                 if (pad->lanes[i]) {
 331                         lane = phy_get_drvdata(pad->lanes[i]);
 332                         tegra_xusb_lane_program(lane);
 333                 }
 334         }
 335 }
 336
 337 static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl)
 338 {
 339         struct tegra_xusb_pad *pad;
 340         unsigned int i;
 341
 342         mutex_lock(&padctl->lock);
 343
 344         for (i = 0; i < padctl->soc->num_pads; i++) {
 345                 const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i];
 346                 int err;
 347
 348                 pad = tegra_xusb_pad_create(padctl, soc);
 349                 if (IS_ERR(pad)) {
 350                         err = PTR_ERR(pad);
 351                         dev_err(padctl->dev, "failed to create pad %s: %d\n",
 352                                 soc->name, err);
 353                         __tegra_xusb_remove_pads(padctl);
 354                         mutex_unlock(&padctl->lock);
 355                         return err;
 356                 }
 357
 358                 if (!pad)
 359                         continue;
 360
 361                 list_add_tail(&pad->list, &padctl->pads);
 362         }
 363
 364         list_for_each_entry(pad, &padctl->pads, list)
 365                 tegra_xusb_pad_program(pad);
 366
 367         mutex_unlock(&padctl->lock);
 368         return 0;
 369 }
 370
 371 static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane,
 372                                   const char *function)
 373 {
 374         const char *func = lane->soc->funcs[lane->function];
 375
 376         return strcmp(function, func) == 0;
 377 }
 378
 379 struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl,
 380                                              const char *type,
 381                                              unsigned int index)
 382 {
 383         struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV);
 384         char *name;
 385
 386         name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
 387         if (!name)
 388                 return ERR_PTR(-ENOMEM);
 389
 390         list_for_each_entry(lane, &padctl->lanes, list) {
 391                 if (strcmp(lane->soc->name, name) == 0) {
 392                         hit = lane;
 393                         break;
 394                 }
 395         }
 396
 397         kfree(name);
 398         return hit;
 399 }
 400
 401 struct tegra_xusb_lane *
 402 tegra_xusb_port_find_lane(struct tegra_xusb_port *port,
 403                           const struct tegra_xusb_lane_map *map,
 404                           const char *function)
 405 {
 406         struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV);
 407
 408         for (; map->type; map++) {
 409                 if (port->index != map->port)
 410                         continue;
 411
 412                 lane = tegra_xusb_find_lane(port->padctl, map->type,
 413                                             map->index);
 414                 if (IS_ERR(lane))
 415                         continue;
 416
 417                 if (!tegra_xusb_lane_check(lane, function))
 418                         continue;
 419
 420                 if (!IS_ERR(match))
 421                         dev_err(&port->dev, "conflicting match: %s-%u / %s\n",
 422                                 map->type, map->index, match->soc->name);
 423                 else
 424                         match = lane;
 425         }
 426
 427         return match;
 428 }
 429
 430 static struct device_node *
 431 tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type,
 432                           unsigned int index)
 433 {
 434         struct device_node *ports, *np;
 435         char *name;
 436
 437         ports = of_get_child_by_name(padctl->dev->of_node, "ports");
 438         if (!ports)
 439                 return NULL;
 440
 441         name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
 442         if (!name) {
 443                 of_node_put(ports);
 444                 return ERR_PTR(-ENOMEM);
 445         }
 446         np = of_get_child_by_name(ports, name);
 447         kfree(name);
 448         of_node_put(ports);
 449
 450         return np;
 451 }
 452
 453 struct tegra_xusb_port *
 454 tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type,
 455                      unsigned int index)
 456 {
 457         struct tegra_xusb_port *port;
 458         struct device_node *np;
 459
 460         np = tegra_xusb_find_port_node(padctl, type, index);
 461         if (!np)
 462                 return NULL;
 463
 464         list_for_each_entry(port, &padctl->ports, list) {
 465                 if (np == port->dev.of_node) {
 466                         of_node_put(np);
 467                         return port;
 468                 }
 469         }
 470
 471         of_node_put(np);
 472
 473         return NULL;
 474 }
 475
 476 struct tegra_xusb_usb2_port *
 477 tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index)
 478 {
 479         struct tegra_xusb_port *port;
 480
 481         port = tegra_xusb_find_port(padctl, "usb2", index);
 482         if (port)
 483                 return to_usb2_port(port);
 484
 485         return NULL;
 486 }
 487
 488 struct tegra_xusb_usb3_port *
 489 tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index)
 490 {
 491         struct tegra_xusb_port *port;
 492
 493         port = tegra_xusb_find_port(padctl, "usb3", index);
 494         if (port)
 495                 return to_usb3_port(port);
 496
 497         return NULL;
 498 }
 499
 500 static void tegra_xusb_port_release(struct device *dev)
 501 {
 502 }
 503
 504 static struct device_type tegra_xusb_port_type = {
 505         .release = tegra_xusb_port_release,
 506 };
 507
 508 static int tegra_xusb_port_init(struct tegra_xusb_port *port,
 509                                 struct tegra_xusb_padctl *padctl,
 510                                 struct device_node *np,
 511                                 const char *name,
 512                                 unsigned int index)
 513 {
 514         int err;
 515
 516         INIT_LIST_HEAD(&port->list);
 517         port->padctl = padctl;
 518         port->index = index;
 519
 520         device_initialize(&port->dev);
 521         port->dev.type = &tegra_xusb_port_type;
 522         port->dev.of_node = of_node_get(np);
 523         port->dev.parent = padctl->dev;
 524
 525         err = dev_set_name(&port->dev, "%s-%u", name, index);
 526         if (err < 0)
 527                 goto unregister;
 528
 529         err = device_add(&port->dev);
 530         if (err < 0)
 531                 goto unregister;
 532
 533         return 0;
 534
 535 unregister:
 536         device_unregister(&port->dev);
 537         return err;
 538 }
 539
 540 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
 541 {
 542         device_unregister(&port->dev);
 543 }
 544
 545 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
 546 {
 547         struct tegra_xusb_port *port = &usb2->base;
 548         struct device_node *np = port->dev.of_node;
 549
 550         usb2->internal = of_property_read_bool(np, "nvidia,internal");
 551
 552         usb2->supply = devm_regulator_get(&port->dev, "vbus");
 553         return PTR_ERR_OR_ZERO(usb2->supply);
 554 }
 555
 556 static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl,
 557                                     unsigned int index)
 558 {
 559         struct tegra_xusb_usb2_port *usb2;
 560         struct device_node *np;
 561         int err = 0;
 562
 563         /*
 564          * USB2 ports don't require additional properties, but if the port is
 565          * marked as disabled there is no reason to register it.
 566          */
 567         np = tegra_xusb_find_port_node(padctl, "usb2", index);
 568         if (!np || !of_device_is_available(np))
 569                 goto out;
 570
 571         usb2 = devm_kzalloc(padctl->dev, sizeof(*usb2), GFP_KERNEL);
 572         if (!usb2) {
 573                 err = -ENOMEM;
 574                 goto out;
 575         }
 576
 577         err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index);
 578         if (err < 0)
 579                 goto out;
 580
 581         usb2->base.ops = padctl->soc->ports.usb2.ops;
 582
 583         usb2->base.lane = usb2->base.ops->map(&usb2->base);
 584         if (IS_ERR(usb2->base.lane)) {
 585                 err = PTR_ERR(usb2->base.lane);
 586                 goto out;
 587         }
 588
 589         err = tegra_xusb_usb2_port_parse_dt(usb2);
 590         if (err < 0) {
 591                 tegra_xusb_port_unregister(&usb2->base);
 592                 goto out;
 593         }
 594
 595         list_add_tail(&usb2->base.list, &padctl->ports);
 596
 597 out:
 598         of_node_put(np);
 599         return err;
 600 }
 601
 602 static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi)
 603 {
 604         struct tegra_xusb_port *port = &ulpi->base;
 605         struct device_node *np = port->dev.of_node;
 606
 607         ulpi->internal = of_property_read_bool(np, "nvidia,internal");
 608
 609         return 0;
 610 }
 611
 612 static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl,
 613                                     unsigned int index)
 614 {
 615         struct tegra_xusb_ulpi_port *ulpi;
 616         struct device_node *np;
 617         int err = 0;
 618
 619         np = tegra_xusb_find_port_node(padctl, "ulpi", index);
 620         if (!np || !of_device_is_available(np))
 621                 goto out;
 622
 623         ulpi = devm_kzalloc(padctl->dev, sizeof(*ulpi), GFP_KERNEL);
 624         if (!ulpi) {
 625                 err = -ENOMEM;
 626                 goto out;
 627         }
 628
 629         err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index);
 630         if (err < 0)
 631                 goto out;
 632
 633         ulpi->base.ops = padctl->soc->ports.ulpi.ops;
 634
 635         ulpi->base.lane = ulpi->base.ops->map(&ulpi->base);
 636         if (IS_ERR(ulpi->base.lane)) {
 637                 err = PTR_ERR(ulpi->base.lane);
 638                 goto out;
 639         }
 640
 641         err = tegra_xusb_ulpi_port_parse_dt(ulpi);
 642         if (err < 0) {
 643                 tegra_xusb_port_unregister(&ulpi->base);
 644                 goto out;
 645         }
 646
 647         list_add_tail(&ulpi->base.list, &padctl->ports);
 648
 649 out:
 650         of_node_put(np);
 651         return err;
 652 }
 653
 654 static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic)
 655 {
 656         /* XXX */
 657         return 0;
 658 }
 659
 660 static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl,
 661                                     unsigned int index)
 662 {
 663         struct tegra_xusb_hsic_port *hsic;
 664         struct device_node *np;
 665         int err = 0;
 666
 667         np = tegra_xusb_find_port_node(padctl, "hsic", index);
 668         if (!np || !of_device_is_available(np))
 669                 goto out;
 670
 671         hsic = devm_kzalloc(padctl->dev, sizeof(*hsic), GFP_KERNEL);
 672         if (!hsic) {
 673                 err = -ENOMEM;
 674                 goto out;
 675         }
 676
 677         err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index);
 678         if (err < 0)
 679                 goto out;
 680
 681         hsic->base.ops = padctl->soc->ports.hsic.ops;
 682
 683         hsic->base.lane = hsic->base.ops->map(&hsic->base);
 684         if (IS_ERR(hsic->base.lane)) {
 685                 err = PTR_ERR(hsic->base.lane);
 686                 goto out;
 687         }
 688
 689         err = tegra_xusb_hsic_port_parse_dt(hsic);
 690         if (err < 0) {
 691                 tegra_xusb_port_unregister(&hsic->base);
 692                 goto out;
 693         }
 694
 695         list_add_tail(&hsic->base.list, &padctl->ports);
 696
 697 out:
 698         of_node_put(np);
 699         return err;
 700 }
 701
 702 static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3)
 703 {
 704         struct tegra_xusb_port *port = &usb3->base;
 705         struct device_node *np = port->dev.of_node;
 706         u32 value;
 707         int err;
 708
 709         err = of_property_read_u32(np, "nvidia,usb2-companion", &value);
 710         if (err < 0) {
 711                 dev_err(&port->dev, "failed to read port: %d\n", err);
 712                 return err;
 713         }
 714
 715         usb3->port = value;
 716
 717         usb3->internal = of_property_read_bool(np, "nvidia,internal");
 718
 719         usb3->supply = devm_regulator_get(&port->dev, "vbus");
 720         return PTR_ERR_OR_ZERO(usb3->supply);
 721 }
 722
 723 static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl,
 724                                     unsigned int index)
 725 {
 726         struct tegra_xusb_usb3_port *usb3;
 727         struct device_node *np;
 728         int err = 0;
 729
 730         /*
 731          * If there is no supplemental configuration in the device tree the
 732          * port is unusable. But it is valid to configure only a single port,
 733          * hence return 0 instead of an error to allow ports to be optional.
 734          */
 735         np = tegra_xusb_find_port_node(padctl, "usb3", index);
 736         if (!np || !of_device_is_available(np))
 737                 goto out;
 738
 739         usb3 = devm_kzalloc(padctl->dev, sizeof(*usb3), GFP_KERNEL);
 740         if (!usb3) {
 741                 err = -ENOMEM;
 742                 goto out;
 743         }
 744
 745         err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index);
 746         if (err < 0)
 747                 goto out;
 748
 749         usb3->base.ops = padctl->soc->ports.usb3.ops;
 750
 751         usb3->base.lane = usb3->base.ops->map(&usb3->base);
 752         if (IS_ERR(usb3->base.lane)) {
 753                 err = PTR_ERR(usb3->base.lane);
 754                 goto out;
 755         }
 756
 757         err = tegra_xusb_usb3_port_parse_dt(usb3);
 758         if (err < 0) {
 759                 tegra_xusb_port_unregister(&usb3->base);
 760                 goto out;
 761         }
 762
 763         list_add_tail(&usb3->base.list, &padctl->ports);
 764
 765 out:
 766         of_node_put(np);
 767         return err;
 768 }
 769
 770 static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
 771 {
 772         struct tegra_xusb_port *port, *tmp;
 773
 774         list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) {
 775                 list_del(&port->list);
 776                 tegra_xusb_port_unregister(port);
 777         }
 778 }
 779
 780 static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl)
 781 {
 782         struct tegra_xusb_port *port;
 783         unsigned int i;
 784         int err = 0;
 785
 786         mutex_lock(&padctl->lock);
 787
 788         for (i = 0; i < padctl->soc->ports.usb2.count; i++) {
 789                 err = tegra_xusb_add_usb2_port(padctl, i);
 790                 if (err < 0)
 791                         goto remove_ports;
 792         }
 793
 794         for (i = 0; i < padctl->soc->ports.ulpi.count; i++) {
 795                 err = tegra_xusb_add_ulpi_port(padctl, i);
 796                 if (err < 0)
 797                         goto remove_ports;
 798         }
 799
 800         for (i = 0; i < padctl->soc->ports.hsic.count; i++) {
 801                 err = tegra_xusb_add_hsic_port(padctl, i);
 802                 if (err < 0)
 803                         goto remove_ports;
 804         }
 805
 806         for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
 807                 err = tegra_xusb_add_usb3_port(padctl, i);
 808                 if (err < 0)
 809                         goto remove_ports;
 810         }
 811
 812         list_for_each_entry(port, &padctl->ports, list) {
 813                 err = port->ops->enable(port);
 814                 if (err < 0)
 815                         dev_err(padctl->dev, "failed to enable port %s: %d\n",
 816                                 dev_name(&port->dev), err);
 817         }
 818
 819         goto unlock;
 820
 821 remove_ports:
 822         __tegra_xusb_remove_ports(padctl);
 823 unlock:
 824         mutex_unlock(&padctl->lock);
 825         return err;
 826 }
 827
 828 static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
 829 {
 830         mutex_lock(&padctl->lock);
 831         __tegra_xusb_remove_ports(padctl);
 832         mutex_unlock(&padctl->lock);
 833 }
 834
 835 static int tegra_xusb_padctl_probe(struct platform_device *pdev)
 836 {
 837         struct device_node *np = pdev->dev.of_node;
 838         const struct tegra_xusb_padctl_soc *soc;
 839         struct tegra_xusb_padctl *padctl;
 840         const struct of_device_id *match;
 841         struct resource *res;
 842         int err;
 843
 844         /* for backwards compatibility with old device trees */
 845         np = of_get_child_by_name(np, "pads");
 846         if (!np) {
 847                 dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n");
 848                 return tegra_xusb_padctl_legacy_probe(pdev);
 849         }
 850
 851         of_node_put(np);
 852
 853         match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node);
 854         soc = match->data;
 855
 856         padctl = soc->ops->probe(&pdev->dev, soc);
 857         if (IS_ERR(padctl))
 858                 return PTR_ERR(padctl);
 859
 860         platform_set_drvdata(pdev, padctl);
 861         INIT_LIST_HEAD(&padctl->ports);
 862         INIT_LIST_HEAD(&padctl->lanes);
 863         INIT_LIST_HEAD(&padctl->pads);
 864         mutex_init(&padctl->lock);
 865
 866         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 867         padctl->regs = devm_ioremap_resource(&pdev->dev, res);
 868         if (IS_ERR(padctl->regs)) {
 869                 err = PTR_ERR(padctl->regs);
 870                 goto remove;
 871         }
 872
 873         padctl->rst = devm_reset_control_get(&pdev->dev, NULL);
 874         if (IS_ERR(padctl->rst)) {
 875                 err = PTR_ERR(padctl->rst);
 876                 goto remove;
 877         }
 878
 879         err = reset_control_deassert(padctl->rst);
 880         if (err < 0)
 881                 goto remove;
 882
 883         err = tegra_xusb_setup_pads(padctl);
 884         if (err < 0) {
 885                 dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
 886                 goto reset;
 887         }
 888
 889         err = tegra_xusb_setup_ports(padctl);
 890         if (err) {
 891                 dev_err(&pdev->dev, "failed to setup XUSB ports: %d\n", err);
 892                 goto remove_pads;
 893         }
 894
 895         return 0;
 896
 897 remove_pads:
 898         tegra_xusb_remove_pads(padctl);
 899 reset:
 900         reset_control_assert(padctl->rst);
 901 remove:
 902         soc->ops->remove(padctl);
 903         return err;
 904 }
 905
 906 static int tegra_xusb_padctl_remove(struct platform_device *pdev)
 907 {
 908         struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
 909         int err;
 910
 911         tegra_xusb_remove_ports(padctl);
 912         tegra_xusb_remove_pads(padctl);
 913
 914         err = reset_control_assert(padctl->rst);
 915         if (err < 0)
 916                 dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
 917
 918         padctl->soc->ops->remove(padctl);
 919
 920         return err;
 921 }
 922
 923 static struct platform_driver tegra_xusb_padctl_driver = {
 924         .driver = {
 925                 .name = "tegra-xusb-padctl",
 926                 .of_match_table = tegra_xusb_padctl_of_match,
 927         },
 928         .probe = tegra_xusb_padctl_probe,
 929         .remove = tegra_xusb_padctl_remove,
 930 };
 931 module_platform_driver(tegra_xusb_padctl_driver);
 932
 933 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev)
 934 {
 935         struct tegra_xusb_padctl *padctl;
 936         struct platform_device *pdev;
 937         struct device_node *np;
 938
 939         np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0);
 940         if (!np)
 941                 return ERR_PTR(-EINVAL);
 942
 943         /*
 944          * This is slightly ugly. A better implementation would be to keep a
 945          * registry of pad controllers, but since there will almost certainly
 946          * only ever be one per SoC that would be a little overkill.
 947          */
 948         pdev = of_find_device_by_node(np);
 949         if (!pdev) {
 950                 of_node_put(np);
 951                 return ERR_PTR(-ENODEV);
 952         }
 953
 954         of_node_put(np);
 955
 956         padctl = platform_get_drvdata(pdev);
 957         if (!padctl) {
 958                 put_device(&pdev->dev);
 959                 return ERR_PTR(-EPROBE_DEFER);
 960         }
 961
 962         return padctl;
 963 }
 964 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get);
 965
 966 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl)
 967 {
 968         if (padctl)
 969                 put_device(padctl->dev);
 970 }
 971 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put);
 972
 973 int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl,
 974                                         unsigned int port)
 975 {
 976         if (padctl->soc->ops->usb3_save_context)
 977                 return padctl->soc->ops->usb3_save_context(padctl, port);
 978
 979         return -ENOSYS;
 980 }
 981 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context);
 982
 983 int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
 984                                     unsigned int port, bool idle)
 985 {
 986         if (padctl->soc->ops->hsic_set_idle)
 987                 return padctl->soc->ops->hsic_set_idle(padctl, port, idle);
 988
 989         return -ENOSYS;
 990 }
 991 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);
 992
 993 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
 994                                            unsigned int port, bool enable)
 995 {
 996         if (padctl->soc->ops->usb3_set_lfps_detect)
 997                 return padctl->soc->ops->usb3_set_lfps_detect(padctl, port,
 998                                                               enable);
 999
1000         return -ENOSYS;
1001 }
1002 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);
1003
1004 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
1005 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
1006 MODULE_LICENSE("GPL v2");