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         /*
  79          * of_find_node_by_name() drops a reference, so make sure to grab one.
  80          */
  81         struct device_node *np = of_node_get(padctl->dev->of_node);
  82
  83         np = of_find_node_by_name(np, "pads");
  84         if (np)
  85                 np = of_find_node_by_name(np, name);
  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         /*
  94          * of_find_node_by_name() drops a reference, so make sure to grab one.
  95          */
  96         struct device_node *np = of_node_get(pad->dev.of_node);
  97
  98         np = of_find_node_by_name(np, "lanes");
  99         if (!np)
 100                 return NULL;
 101
 102         return of_find_node_by_name(np, pad->soc->lanes[index].name);
 103 }
 104
 105 static int
 106 tegra_xusb_lane_lookup_function(struct tegra_xusb_lane *lane,
 107                                     const char *function)
 108 {
 109         unsigned int i;
 110
 111         for (i = 0; i < lane->soc->num_funcs; i++)
 112                 if (strcmp(function, lane->soc->funcs[i]) == 0)
 113                         return i;
 114
 115         return -EINVAL;
 116 }
 117
 118 int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
 119                              struct device_node *np)
 120 {
 121         struct device *dev = &lane->pad->dev;
 122         const char *function;
 123         int err;
 124
 125         err = of_property_read_string(np, "nvidia,function", &function);
 126         if (err < 0)
 127                 return err;
 128
 129         err = tegra_xusb_lane_lookup_function(lane, function);
 130         if (err < 0) {
 131                 dev_err(dev, "invalid function \"%s\" for lane \"%s\"\n",
 132                         function, np->name);
 133                 return err;
 134         }
 135
 136         lane->function = err;
 137
 138         return 0;
 139 }
 140
 141 static void tegra_xusb_lane_destroy(struct phy *phy)
 142 {
 143         if (phy) {
 144                 struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
 145
 146                 lane->pad->ops->remove(lane);
 147                 phy_destroy(phy);
 148         }
 149 }
 150
 151 static void tegra_xusb_pad_release(struct device *dev)
 152 {
 153         struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev);
 154
 155         pad->soc->ops->remove(pad);
 156 }
 157
 158 static struct device_type tegra_xusb_pad_type = {
 159         .release = tegra_xusb_pad_release,
 160 };
 161
 162 int tegra_xusb_pad_init(struct tegra_xusb_pad *pad,
 163                         struct tegra_xusb_padctl *padctl,
 164                         struct device_node *np)
 165 {
 166         int err;
 167
 168         device_initialize(&pad->dev);
 169         INIT_LIST_HEAD(&pad->list);
 170         pad->dev.parent = padctl->dev;
 171         pad->dev.type = &tegra_xusb_pad_type;
 172         pad->dev.of_node = np;
 173         pad->padctl = padctl;
 174
 175         err = dev_set_name(&pad->dev, "%s", pad->soc->name);
 176         if (err < 0)
 177                 goto unregister;
 178
 179         err = device_add(&pad->dev);
 180         if (err < 0)
 181                 goto unregister;
 182
 183         return 0;
 184
 185 unregister:
 186         device_unregister(&pad->dev);
 187         return err;
 188 }
 189
 190 int tegra_xusb_pad_register(struct tegra_xusb_pad *pad,
 191                             const struct phy_ops *ops)
 192 {
 193         struct device_node *children;
 194         struct phy *lane;
 195         unsigned int i;
 196         int err;
 197
 198         children = of_find_node_by_name(pad->dev.of_node, "lanes");
 199         if (!children)
 200                 return -ENODEV;
 201
 202         pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane),
 203                                   GFP_KERNEL);
 204         if (!pad->lanes) {
 205                 of_node_put(children);
 206                 return -ENOMEM;
 207         }
 208
 209         for (i = 0; i < pad->soc->num_lanes; i++) {
 210                 struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i);
 211                 struct tegra_xusb_lane *lane;
 212
 213                 /* skip disabled lanes */
 214                 if (!np || !of_device_is_available(np)) {
 215                         of_node_put(np);
 216                         continue;
 217                 }
 218
 219                 pad->lanes[i] = phy_create(&pad->dev, np, ops);
 220                 if (IS_ERR(pad->lanes[i])) {
 221                         err = PTR_ERR(pad->lanes[i]);
 222                         of_node_put(np);
 223                         goto remove;
 224                 }
 225
 226                 lane = pad->ops->probe(pad, np, i);
 227                 if (IS_ERR(lane)) {
 228                         phy_destroy(pad->lanes[i]);
 229                         err = PTR_ERR(lane);
 230                         goto remove;
 231                 }
 232
 233                 list_add_tail(&lane->list, &pad->padctl->lanes);
 234                 phy_set_drvdata(pad->lanes[i], lane);
 235         }
 236
 237         pad->provider = of_phy_provider_register_full(&pad->dev, children,
 238                                                       tegra_xusb_pad_of_xlate);
 239         if (IS_ERR(pad->provider)) {
 240                 err = PTR_ERR(pad->provider);
 241                 goto remove;
 242         }
 243
 244         return 0;
 245
 246 remove:
 247         while (i--)
 248                 tegra_xusb_lane_destroy(pad->lanes[i]);
 249
 250         of_node_put(children);
 251
 252         return err;
 253 }
 254
 255 void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad)
 256 {
 257         unsigned int i = pad->soc->num_lanes;
 258
 259         of_phy_provider_unregister(pad->provider);
 260
 261         while (i--)
 262                 tegra_xusb_lane_destroy(pad->lanes[i]);
 263
 264         device_unregister(&pad->dev);
 265 }
 266
 267 static struct tegra_xusb_pad *
 268 tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl,
 269                       const struct tegra_xusb_pad_soc *soc)
 270 {
 271         struct tegra_xusb_pad *pad;
 272         struct device_node *np;
 273         int err;
 274
 275         np = tegra_xusb_find_pad_node(padctl, soc->name);
 276         if (!np || !of_device_is_available(np))
 277                 return NULL;
 278
 279         pad = soc->ops->probe(padctl, soc, np);
 280         if (IS_ERR(pad)) {
 281                 err = PTR_ERR(pad);
 282                 dev_err(padctl->dev, "failed to create pad %s: %d\n",
 283                         soc->name, err);
 284                 return ERR_PTR(err);
 285         }
 286
 287         /* XXX move this into ->probe() to avoid string comparison */
 288         if (strcmp(soc->name, "pcie") == 0)
 289                 padctl->pcie = pad;
 290
 291         if (strcmp(soc->name, "sata") == 0)
 292                 padctl->sata = pad;
 293
 294         if (strcmp(soc->name, "usb2") == 0)
 295                 padctl->usb2 = pad;
 296
 297         if (strcmp(soc->name, "ulpi") == 0)
 298                 padctl->ulpi = pad;
 299
 300         if (strcmp(soc->name, "hsic") == 0)
 301                 padctl->hsic = pad;
 302
 303         return pad;
 304 }
 305
 306 static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
 307 {
 308         struct tegra_xusb_pad *pad, *tmp;
 309
 310         list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) {
 311                 list_del(&pad->list);
 312                 tegra_xusb_pad_unregister(pad);
 313         }
 314 }
 315
 316 static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
 317 {
 318         mutex_lock(&padctl->lock);
 319         __tegra_xusb_remove_pads(padctl);
 320         mutex_unlock(&padctl->lock);
 321 }
 322
 323 static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
 324 {
 325         struct tegra_xusb_padctl *padctl = lane->pad->padctl;
 326         const struct tegra_xusb_lane_soc *soc = lane->soc;
 327         u32 value;
 328
 329         /* choose function */
 330         value = padctl_readl(padctl, soc->offset);
 331         value &= ~(soc->mask << soc->shift);
 332         value |= lane->function << soc->shift;
 333         padctl_writel(padctl, value, soc->offset);
 334 }
 335
 336 static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad)
 337 {
 338         unsigned int i;
 339
 340         for (i = 0; i < pad->soc->num_lanes; i++) {
 341                 struct tegra_xusb_lane *lane;
 342
 343                 if (pad->lanes[i]) {
 344                         lane = phy_get_drvdata(pad->lanes[i]);
 345                         tegra_xusb_lane_program(lane);
 346                 }
 347         }
 348 }
 349
 350 static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl)
 351 {
 352         struct tegra_xusb_pad *pad;
 353         unsigned int i;
 354
 355         mutex_lock(&padctl->lock);
 356
 357         for (i = 0; i < padctl->soc->num_pads; i++) {
 358                 const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i];
 359                 int err;
 360
 361                 pad = tegra_xusb_pad_create(padctl, soc);
 362                 if (IS_ERR(pad)) {
 363                         err = PTR_ERR(pad);
 364                         dev_err(padctl->dev, "failed to create pad %s: %d\n",
 365                                 soc->name, err);
 366                         __tegra_xusb_remove_pads(padctl);
 367                         mutex_unlock(&padctl->lock);
 368                         return err;
 369                 }
 370
 371                 if (!pad)
 372                         continue;
 373
 374                 list_add_tail(&pad->list, &padctl->pads);
 375         }
 376
 377         list_for_each_entry(pad, &padctl->pads, list)
 378                 tegra_xusb_pad_program(pad);
 379
 380         mutex_unlock(&padctl->lock);
 381         return 0;
 382 }
 383
 384 static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane,
 385                                   const char *function)
 386 {
 387         const char *func = lane->soc->funcs[lane->function];
 388
 389         return strcmp(function, func) == 0;
 390 }
 391
 392 struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl,
 393                                              const char *type,
 394                                              unsigned int index)
 395 {
 396         struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV);
 397         char *name;
 398
 399         name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
 400         if (!name)
 401                 return ERR_PTR(-ENOMEM);
 402
 403         list_for_each_entry(lane, &padctl->lanes, list) {
 404                 if (strcmp(lane->soc->name, name) == 0) {
 405                         hit = lane;
 406                         break;
 407                 }
 408         }
 409
 410         kfree(name);
 411         return hit;
 412 }
 413
 414 struct tegra_xusb_lane *
 415 tegra_xusb_port_find_lane(struct tegra_xusb_port *port,
 416                           const struct tegra_xusb_lane_map *map,
 417                           const char *function)
 418 {
 419         struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV);
 420
 421         for (map = map; map->type; map++) {
 422                 if (port->index != map->port)
 423                         continue;
 424
 425                 lane = tegra_xusb_find_lane(port->padctl, map->type,
 426                                             map->index);
 427                 if (IS_ERR(lane))
 428                         continue;
 429
 430                 if (!tegra_xusb_lane_check(lane, function))
 431                         continue;
 432
 433                 if (!IS_ERR(match))
 434                         dev_err(&port->dev, "conflicting match: %s-%u / %s\n",
 435                                 map->type, map->index, match->soc->name);
 436                 else
 437                         match = lane;
 438         }
 439
 440         return match;
 441 }
 442
 443 static struct device_node *
 444 tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type,
 445                           unsigned int index)
 446 {
 447         /*
 448          * of_find_node_by_name() drops a reference, so make sure to grab one.
 449          */
 450         struct device_node *np = of_node_get(padctl->dev->of_node);
 451
 452         np = of_find_node_by_name(np, "ports");
 453         if (np) {
 454                 char *name;
 455
 456                 name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
 457                 if (!name)
 458                         return ERR_PTR(-ENOMEM);
 459                 np = of_find_node_by_name(np, name);
 460                 kfree(name);
 461         }
 462
 463         return np;
 464 }
 465
 466 struct tegra_xusb_port *
 467 tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type,
 468                      unsigned int index)
 469 {
 470         struct tegra_xusb_port *port;
 471         struct device_node *np;
 472
 473         np = tegra_xusb_find_port_node(padctl, type, index);
 474         if (!np)
 475                 return NULL;
 476
 477         list_for_each_entry(port, &padctl->ports, list) {
 478                 if (np == port->dev.of_node) {
 479                         of_node_put(np);
 480                         return port;
 481                 }
 482         }
 483
 484         of_node_put(np);
 485
 486         return NULL;
 487 }
 488
 489 struct tegra_xusb_usb2_port *
 490 tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index)
 491 {
 492         struct tegra_xusb_port *port;
 493
 494         port = tegra_xusb_find_port(padctl, "usb2", index);
 495         if (port)
 496                 return to_usb2_port(port);
 497
 498         return NULL;
 499 }
 500
 501 struct tegra_xusb_usb3_port *
 502 tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index)
 503 {
 504         struct tegra_xusb_port *port;
 505
 506         port = tegra_xusb_find_port(padctl, "usb3", index);
 507         if (port)
 508                 return to_usb3_port(port);
 509
 510         return NULL;
 511 }
 512
 513 static void tegra_xusb_port_release(struct device *dev)
 514 {
 515 }
 516
 517 static struct device_type tegra_xusb_port_type = {
 518         .release = tegra_xusb_port_release,
 519 };
 520
 521 static int tegra_xusb_port_init(struct tegra_xusb_port *port,
 522                                 struct tegra_xusb_padctl *padctl,
 523                                 struct device_node *np,
 524                                 const char *name,
 525                                 unsigned int index)
 526 {
 527         int err;
 528
 529         INIT_LIST_HEAD(&port->list);
 530         port->padctl = padctl;
 531         port->index = index;
 532
 533         device_initialize(&port->dev);
 534         port->dev.type = &tegra_xusb_port_type;
 535         port->dev.of_node = of_node_get(np);
 536         port->dev.parent = padctl->dev;
 537
 538         err = dev_set_name(&port->dev, "%s-%u", name, index);
 539         if (err < 0)
 540                 goto unregister;
 541
 542         err = device_add(&port->dev);
 543         if (err < 0)
 544                 goto unregister;
 545
 546         return 0;
 547
 548 unregister:
 549         device_unregister(&port->dev);
 550         return err;
 551 }
 552
 553 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
 554 {
 555         device_unregister(&port->dev);
 556 }
 557
 558 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
 559 {
 560         struct tegra_xusb_port *port = &usb2->base;
 561         struct device_node *np = port->dev.of_node;
 562
 563         usb2->internal = of_property_read_bool(np, "nvidia,internal");
 564
 565         usb2->supply = devm_regulator_get(&port->dev, "vbus");
 566         return PTR_ERR_OR_ZERO(usb2->supply);
 567 }
 568
 569 static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl,
 570                                     unsigned int index)
 571 {
 572         struct tegra_xusb_usb2_port *usb2;
 573         struct device_node *np;
 574         int err = 0;
 575
 576         /*
 577          * USB2 ports don't require additional properties, but if the port is
 578          * marked as disabled there is no reason to register it.
 579          */
 580         np = tegra_xusb_find_port_node(padctl, "usb2", index);
 581         if (!np || !of_device_is_available(np))
 582                 goto out;
 583
 584         usb2 = devm_kzalloc(padctl->dev, sizeof(*usb2), GFP_KERNEL);
 585         if (!usb2) {
 586                 err = -ENOMEM;
 587                 goto out;
 588         }
 589
 590         err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index);
 591         if (err < 0)
 592                 goto out;
 593
 594         usb2->base.ops = padctl->soc->ports.usb2.ops;
 595
 596         usb2->base.lane = usb2->base.ops->map(&usb2->base);
 597         if (IS_ERR(usb2->base.lane)) {
 598                 err = PTR_ERR(usb2->base.lane);
 599                 goto out;
 600         }
 601
 602         err = tegra_xusb_usb2_port_parse_dt(usb2);
 603         if (err < 0) {
 604                 tegra_xusb_port_unregister(&usb2->base);
 605                 goto out;
 606         }
 607
 608         list_add_tail(&usb2->base.list, &padctl->ports);
 609
 610 out:
 611         of_node_put(np);
 612         return err;
 613 }
 614
 615 static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi)
 616 {
 617         struct tegra_xusb_port *port = &ulpi->base;
 618         struct device_node *np = port->dev.of_node;
 619
 620         ulpi->internal = of_property_read_bool(np, "nvidia,internal");
 621
 622         return 0;
 623 }
 624
 625 static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl,
 626                                     unsigned int index)
 627 {
 628         struct tegra_xusb_ulpi_port *ulpi;
 629         struct device_node *np;
 630         int err = 0;
 631
 632         np = tegra_xusb_find_port_node(padctl, "ulpi", index);
 633         if (!np || !of_device_is_available(np))
 634                 goto out;
 635
 636         ulpi = devm_kzalloc(padctl->dev, sizeof(*ulpi), GFP_KERNEL);
 637         if (!ulpi) {
 638                 err = -ENOMEM;
 639                 goto out;
 640         }
 641
 642         err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index);
 643         if (err < 0)
 644                 goto out;
 645
 646         ulpi->base.ops = padctl->soc->ports.ulpi.ops;
 647
 648         ulpi->base.lane = ulpi->base.ops->map(&ulpi->base);
 649         if (IS_ERR(ulpi->base.lane)) {
 650                 err = PTR_ERR(ulpi->base.lane);
 651                 goto out;
 652         }
 653
 654         err = tegra_xusb_ulpi_port_parse_dt(ulpi);
 655         if (err < 0) {
 656                 tegra_xusb_port_unregister(&ulpi->base);
 657                 goto out;
 658         }
 659
 660         list_add_tail(&ulpi->base.list, &padctl->ports);
 661
 662 out:
 663         of_node_put(np);
 664         return err;
 665 }
 666
 667 static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic)
 668 {
 669         /* XXX */
 670         return 0;
 671 }
 672
 673 static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl,
 674                                     unsigned int index)
 675 {
 676         struct tegra_xusb_hsic_port *hsic;
 677         struct device_node *np;
 678         int err = 0;
 679
 680         np = tegra_xusb_find_port_node(padctl, "hsic", index);
 681         if (!np || !of_device_is_available(np))
 682                 goto out;
 683
 684         hsic = devm_kzalloc(padctl->dev, sizeof(*hsic), GFP_KERNEL);
 685         if (!hsic) {
 686                 err = -ENOMEM;
 687                 goto out;
 688         }
 689
 690         err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index);
 691         if (err < 0)
 692                 goto out;
 693
 694         hsic->base.ops = padctl->soc->ports.hsic.ops;
 695
 696         hsic->base.lane = hsic->base.ops->map(&hsic->base);
 697         if (IS_ERR(hsic->base.lane)) {
 698                 err = PTR_ERR(hsic->base.lane);
 699                 goto out;
 700         }
 701
 702         err = tegra_xusb_hsic_port_parse_dt(hsic);
 703         if (err < 0) {
 704                 tegra_xusb_port_unregister(&hsic->base);
 705                 goto out;
 706         }
 707
 708         list_add_tail(&hsic->base.list, &padctl->ports);
 709
 710 out:
 711         of_node_put(np);
 712         return err;
 713 }
 714
 715 static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3)
 716 {
 717         struct tegra_xusb_port *port = &usb3->base;
 718         struct device_node *np = port->dev.of_node;
 719         u32 value;
 720         int err;
 721
 722         err = of_property_read_u32(np, "nvidia,usb2-companion", &value);
 723         if (err < 0) {
 724                 dev_err(&port->dev, "failed to read port: %d\n", err);
 725                 return err;
 726         }
 727
 728         usb3->port = value;
 729
 730         usb3->internal = of_property_read_bool(np, "nvidia,internal");
 731
 732         usb3->supply = devm_regulator_get(&port->dev, "vbus");
 733         return PTR_ERR_OR_ZERO(usb3->supply);
 734 }
 735
 736 static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl,
 737                                     unsigned int index)
 738 {
 739         struct tegra_xusb_usb3_port *usb3;
 740         struct device_node *np;
 741         int err = 0;
 742
 743         /*
 744          * If there is no supplemental configuration in the device tree the
 745          * port is unusable. But it is valid to configure only a single port,
 746          * hence return 0 instead of an error to allow ports to be optional.
 747          */
 748         np = tegra_xusb_find_port_node(padctl, "usb3", index);
 749         if (!np || !of_device_is_available(np))
 750                 goto out;
 751
 752         usb3 = devm_kzalloc(padctl->dev, sizeof(*usb3), GFP_KERNEL);
 753         if (!usb3) {
 754                 err = -ENOMEM;
 755                 goto out;
 756         }
 757
 758         err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index);
 759         if (err < 0)
 760                 goto out;
 761
 762         usb3->base.ops = padctl->soc->ports.usb3.ops;
 763
 764         usb3->base.lane = usb3->base.ops->map(&usb3->base);
 765         if (IS_ERR(usb3->base.lane)) {
 766                 err = PTR_ERR(usb3->base.lane);
 767                 goto out;
 768         }
 769
 770         err = tegra_xusb_usb3_port_parse_dt(usb3);
 771         if (err < 0) {
 772                 tegra_xusb_port_unregister(&usb3->base);
 773                 goto out;
 774         }
 775
 776         list_add_tail(&usb3->base.list, &padctl->ports);
 777
 778 out:
 779         of_node_put(np);
 780         return err;
 781 }
 782
 783 static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
 784 {
 785         struct tegra_xusb_port *port, *tmp;
 786
 787         list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) {
 788                 list_del(&port->list);
 789                 tegra_xusb_port_unregister(port);
 790         }
 791 }
 792
 793 static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl)
 794 {
 795         struct tegra_xusb_port *port;
 796         unsigned int i;
 797         int err = 0;
 798
 799         mutex_lock(&padctl->lock);
 800
 801         for (i = 0; i < padctl->soc->ports.usb2.count; i++) {
 802                 err = tegra_xusb_add_usb2_port(padctl, i);
 803                 if (err < 0)
 804                         goto remove_ports;
 805         }
 806
 807         for (i = 0; i < padctl->soc->ports.ulpi.count; i++) {
 808                 err = tegra_xusb_add_ulpi_port(padctl, i);
 809                 if (err < 0)
 810                         goto remove_ports;
 811         }
 812
 813         for (i = 0; i < padctl->soc->ports.hsic.count; i++) {
 814                 err = tegra_xusb_add_hsic_port(padctl, i);
 815                 if (err < 0)
 816                         goto remove_ports;
 817         }
 818
 819         for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
 820                 err = tegra_xusb_add_usb3_port(padctl, i);
 821                 if (err < 0)
 822                         goto remove_ports;
 823         }
 824
 825         list_for_each_entry(port, &padctl->ports, list) {
 826                 err = port->ops->enable(port);
 827                 if (err < 0)
 828                         dev_err(padctl->dev, "failed to enable port %s: %d\n",
 829                                 dev_name(&port->dev), err);
 830         }
 831
 832         goto unlock;
 833
 834 remove_ports:
 835         __tegra_xusb_remove_ports(padctl);
 836 unlock:
 837         mutex_unlock(&padctl->lock);
 838         return err;
 839 }
 840
 841 static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
 842 {
 843         mutex_lock(&padctl->lock);
 844         __tegra_xusb_remove_ports(padctl);
 845         mutex_unlock(&padctl->lock);
 846 }
 847
 848 static int tegra_xusb_padctl_probe(struct platform_device *pdev)
 849 {
 850         struct device_node *np = of_node_get(pdev->dev.of_node);
 851         const struct tegra_xusb_padctl_soc *soc;
 852         struct tegra_xusb_padctl *padctl;
 853         const struct of_device_id *match;
 854         struct resource *res;
 855         int err;
 856
 857         /* for backwards compatibility with old device trees */
 858         np = of_find_node_by_name(np, "pads");
 859         if (!np) {
 860                 dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n");
 861                 return tegra_xusb_padctl_legacy_probe(pdev);
 862         }
 863
 864         of_node_put(np);
 865
 866         match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node);
 867         soc = match->data;
 868
 869         padctl = soc->ops->probe(&pdev->dev, soc);
 870         if (IS_ERR(padctl))
 871                 return PTR_ERR(padctl);
 872
 873         platform_set_drvdata(pdev, padctl);
 874         INIT_LIST_HEAD(&padctl->ports);
 875         INIT_LIST_HEAD(&padctl->lanes);
 876         INIT_LIST_HEAD(&padctl->pads);
 877         mutex_init(&padctl->lock);
 878
 879         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 880         padctl->regs = devm_ioremap_resource(&pdev->dev, res);
 881         if (IS_ERR(padctl->regs)) {
 882                 err = PTR_ERR(padctl->regs);
 883                 goto remove;
 884         }
 885
 886         padctl->rst = devm_reset_control_get(&pdev->dev, NULL);
 887         if (IS_ERR(padctl->rst)) {
 888                 err = PTR_ERR(padctl->rst);
 889                 goto remove;
 890         }
 891
 892         err = reset_control_deassert(padctl->rst);
 893         if (err < 0)
 894                 goto remove;
 895
 896         err = tegra_xusb_setup_pads(padctl);
 897         if (err < 0) {
 898                 dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
 899                 goto reset;
 900         }
 901
 902         err = tegra_xusb_setup_ports(padctl);
 903         if (err) {
 904                 dev_err(&pdev->dev, "failed to setup XUSB ports: %d\n", err);
 905                 goto remove_pads;
 906         }
 907
 908         return 0;
 909
 910 remove_pads:
 911         tegra_xusb_remove_pads(padctl);
 912 reset:
 913         reset_control_assert(padctl->rst);
 914 remove:
 915         soc->ops->remove(padctl);
 916         return err;
 917 }
 918
 919 static int tegra_xusb_padctl_remove(struct platform_device *pdev)
 920 {
 921         struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
 922         int err;
 923
 924         tegra_xusb_remove_ports(padctl);
 925         tegra_xusb_remove_pads(padctl);
 926
 927         err = reset_control_assert(padctl->rst);
 928         if (err < 0)
 929                 dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
 930
 931         padctl->soc->ops->remove(padctl);
 932
 933         return err;
 934 }
 935
 936 static struct platform_driver tegra_xusb_padctl_driver = {
 937         .driver = {
 938                 .name = "tegra-xusb-padctl",
 939                 .of_match_table = tegra_xusb_padctl_of_match,
 940         },
 941         .probe = tegra_xusb_padctl_probe,
 942         .remove = tegra_xusb_padctl_remove,
 943 };
 944 module_platform_driver(tegra_xusb_padctl_driver);
 945
 946 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev)
 947 {
 948         struct tegra_xusb_padctl *padctl;
 949         struct platform_device *pdev;
 950         struct device_node *np;
 951
 952         np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0);
 953         if (!np)
 954                 return ERR_PTR(-EINVAL);
 955
 956         /*
 957          * This is slightly ugly. A better implementation would be to keep a
 958          * registry of pad controllers, but since there will almost certainly
 959          * only ever be one per SoC that would be a little overkill.
 960          */
 961         pdev = of_find_device_by_node(np);
 962         if (!pdev) {
 963                 of_node_put(np);
 964                 return ERR_PTR(-ENODEV);
 965         }
 966
 967         of_node_put(np);
 968
 969         padctl = platform_get_drvdata(pdev);
 970         if (!padctl) {
 971                 put_device(&pdev->dev);
 972                 return ERR_PTR(-EPROBE_DEFER);
 973         }
 974
 975         return padctl;
 976 }
 977 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get);
 978
 979 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl)
 980 {
 981         if (padctl)
 982                 put_device(padctl->dev);
 983 }
 984 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put);
 985
 986 int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl,
 987                                         unsigned int port)
 988 {
 989         if (padctl->soc->ops->usb3_save_context)
 990                 return padctl->soc->ops->usb3_save_context(padctl, port);
 991
 992         return -ENOSYS;
 993 }
 994 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context);
 995
 996 int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
 997                                     unsigned int port, bool idle)
 998 {
 999         if (padctl->soc->ops->hsic_set_idle)
1000                 return padctl->soc->ops->hsic_set_idle(padctl, port, idle);
1001
1002         return -ENOSYS;
1003 }
1004 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);
1005
1006 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
1007                                            unsigned int port, bool enable)
1008 {
1009         if (padctl->soc->ops->usb3_set_lfps_detect)
1010                 return padctl->soc->ops->usb3_set_lfps_detect(padctl, port,
1011                                                               enable);
1012
1013         return -ENOSYS;
1014 }
1015 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);
1016
1017 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
1018 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
1019 MODULE_LICENSE("GPL v2");