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 { } 70 }; 71 MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match); 72 73 static struct device_node * 74 tegra_xusb_find_pad_node(struct tegra_xusb_padctl *padctl, const char *name) 75 { 76 struct device_node *pads, *np; 77 78 pads = of_get_child_by_name(padctl->dev->of_node, "pads"); 79 if (!pads) 80 return NULL; 81 82 np = of_get_child_by_name(pads, name); 83 of_node_put(pads); 84 85 return np; 86 } 87 88 static struct device_node * 89 tegra_xusb_pad_find_phy_node(struct tegra_xusb_pad *pad, unsigned int index) 90 { 91 struct device_node *np, *lanes; 92 93 lanes = of_get_child_by_name(pad->dev.of_node, "lanes"); 94 if (!lanes) 95 return NULL; 96 97 np = of_get_child_by_name(lanes, pad->soc->lanes[index].name); 98 of_node_put(lanes); 99 100 return np; 101 } 102 103 int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane, 104 struct device_node *np) 105 { 106 struct device *dev = &lane->pad->dev; 107 const char *function; 108 int err; 109 110 err = of_property_read_string(np, "nvidia,function", &function); 111 if (err < 0) 112 return err; 113 114 err = match_string(lane->soc->funcs, lane->soc->num_funcs, function); 115 if (err < 0) { 116 dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n", 117 function, np); 118 return err; 119 } 120 121 lane->function = err; 122 123 return 0; 124 } 125 126 static void tegra_xusb_lane_destroy(struct phy *phy) 127 { 128 if (phy) { 129 struct tegra_xusb_lane *lane = phy_get_drvdata(phy); 130 131 lane->pad->ops->remove(lane); 132 phy_destroy(phy); 133 } 134 } 135 136 static void tegra_xusb_pad_release(struct device *dev) 137 { 138 struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev); 139 140 pad->soc->ops->remove(pad); 141 } 142 143 static struct device_type tegra_xusb_pad_type = { 144 .release = tegra_xusb_pad_release, 145 }; 146 147 int tegra_xusb_pad_init(struct tegra_xusb_pad *pad, 148 struct tegra_xusb_padctl *padctl, 149 struct device_node *np) 150 { 151 int err; 152 153 device_initialize(&pad->dev); 154 INIT_LIST_HEAD(&pad->list); 155 pad->dev.parent = padctl->dev; 156 pad->dev.type = &tegra_xusb_pad_type; 157 pad->dev.of_node = np; 158 pad->padctl = padctl; 159 160 err = dev_set_name(&pad->dev, "%s", pad->soc->name); 161 if (err < 0) 162 goto unregister; 163 164 err = device_add(&pad->dev); 165 if (err < 0) 166 goto unregister; 167 168 return 0; 169 170 unregister: 171 device_unregister(&pad->dev); 172 return err; 173 } 174 175 int tegra_xusb_pad_register(struct tegra_xusb_pad *pad, 176 const struct phy_ops *ops) 177 { 178 struct device_node *children; 179 struct phy *lane; 180 unsigned int i; 181 int err; 182 183 children = of_get_child_by_name(pad->dev.of_node, "lanes"); 184 if (!children) 185 return -ENODEV; 186 187 pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane), 188 GFP_KERNEL); 189 if (!pad->lanes) { 190 of_node_put(children); 191 return -ENOMEM; 192 } 193 194 for (i = 0; i < pad->soc->num_lanes; i++) { 195 struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i); 196 struct tegra_xusb_lane *lane; 197 198 /* skip disabled lanes */ 199 if (!np || !of_device_is_available(np)) { 200 of_node_put(np); 201 continue; 202 } 203 204 pad->lanes[i] = phy_create(&pad->dev, np, ops); 205 if (IS_ERR(pad->lanes[i])) { 206 err = PTR_ERR(pad->lanes[i]); 207 of_node_put(np); 208 goto remove; 209 } 210 211 lane = pad->ops->probe(pad, np, i); 212 if (IS_ERR(lane)) { 213 phy_destroy(pad->lanes[i]); 214 err = PTR_ERR(lane); 215 goto remove; 216 } 217 218 list_add_tail(&lane->list, &pad->padctl->lanes); 219 phy_set_drvdata(pad->lanes[i], lane); 220 } 221 222 pad->provider = of_phy_provider_register_full(&pad->dev, children, 223 tegra_xusb_pad_of_xlate); 224 if (IS_ERR(pad->provider)) { 225 err = PTR_ERR(pad->provider); 226 goto remove; 227 } 228 229 return 0; 230 231 remove: 232 while (i--) 233 tegra_xusb_lane_destroy(pad->lanes[i]); 234 235 of_node_put(children); 236 237 return err; 238 } 239 240 void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad) 241 { 242 unsigned int i = pad->soc->num_lanes; 243 244 of_phy_provider_unregister(pad->provider); 245 246 while (i--) 247 tegra_xusb_lane_destroy(pad->lanes[i]); 248 249 device_unregister(&pad->dev); 250 } 251 252 static struct tegra_xusb_pad * 253 tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl, 254 const struct tegra_xusb_pad_soc *soc) 255 { 256 struct tegra_xusb_pad *pad; 257 struct device_node *np; 258 int err; 259 260 np = tegra_xusb_find_pad_node(padctl, soc->name); 261 if (!np || !of_device_is_available(np)) 262 return NULL; 263 264 pad = soc->ops->probe(padctl, soc, np); 265 if (IS_ERR(pad)) { 266 err = PTR_ERR(pad); 267 dev_err(padctl->dev, "failed to create pad %s: %d\n", 268 soc->name, err); 269 return ERR_PTR(err); 270 } 271 272 /* XXX move this into ->probe() to avoid string comparison */ 273 if (strcmp(soc->name, "pcie") == 0) 274 padctl->pcie = pad; 275 276 if (strcmp(soc->name, "sata") == 0) 277 padctl->sata = pad; 278 279 if (strcmp(soc->name, "usb2") == 0) 280 padctl->usb2 = pad; 281 282 if (strcmp(soc->name, "ulpi") == 0) 283 padctl->ulpi = pad; 284 285 if (strcmp(soc->name, "hsic") == 0) 286 padctl->hsic = pad; 287 288 return pad; 289 } 290 291 static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl) 292 { 293 struct tegra_xusb_pad *pad, *tmp; 294 295 list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) { 296 list_del(&pad->list); 297 tegra_xusb_pad_unregister(pad); 298 } 299 } 300 301 static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl) 302 { 303 mutex_lock(&padctl->lock); 304 __tegra_xusb_remove_pads(padctl); 305 mutex_unlock(&padctl->lock); 306 } 307 308 static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane) 309 { 310 struct tegra_xusb_padctl *padctl = lane->pad->padctl; 311 const struct tegra_xusb_lane_soc *soc = lane->soc; 312 u32 value; 313 314 /* skip single function lanes */ 315 if (soc->num_funcs < 2) 316 return; 317 318 /* choose function */ 319 value = padctl_readl(padctl, soc->offset); 320 value &= ~(soc->mask << soc->shift); 321 value |= lane->function << soc->shift; 322 padctl_writel(padctl, value, soc->offset); 323 } 324 325 static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad) 326 { 327 unsigned int i; 328 329 for (i = 0; i < pad->soc->num_lanes; i++) { 330 struct tegra_xusb_lane *lane; 331 332 if (pad->lanes[i]) { 333 lane = phy_get_drvdata(pad->lanes[i]); 334 tegra_xusb_lane_program(lane); 335 } 336 } 337 } 338 339 static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl) 340 { 341 struct tegra_xusb_pad *pad; 342 unsigned int i; 343 344 mutex_lock(&padctl->lock); 345 346 for (i = 0; i < padctl->soc->num_pads; i++) { 347 const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i]; 348 int err; 349 350 pad = tegra_xusb_pad_create(padctl, soc); 351 if (IS_ERR(pad)) { 352 err = PTR_ERR(pad); 353 dev_err(padctl->dev, "failed to create pad %s: %d\n", 354 soc->name, err); 355 __tegra_xusb_remove_pads(padctl); 356 mutex_unlock(&padctl->lock); 357 return err; 358 } 359 360 if (!pad) 361 continue; 362 363 list_add_tail(&pad->list, &padctl->pads); 364 } 365 366 list_for_each_entry(pad, &padctl->pads, list) 367 tegra_xusb_pad_program(pad); 368 369 mutex_unlock(&padctl->lock); 370 return 0; 371 } 372 373 static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane, 374 const char *function) 375 { 376 const char *func = lane->soc->funcs[lane->function]; 377 378 return strcmp(function, func) == 0; 379 } 380 381 struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl, 382 const char *type, 383 unsigned int index) 384 { 385 struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV); 386 char *name; 387 388 name = kasprintf(GFP_KERNEL, "%s-%u", type, index); 389 if (!name) 390 return ERR_PTR(-ENOMEM); 391 392 list_for_each_entry(lane, &padctl->lanes, list) { 393 if (strcmp(lane->soc->name, name) == 0) { 394 hit = lane; 395 break; 396 } 397 } 398 399 kfree(name); 400 return hit; 401 } 402 403 struct tegra_xusb_lane * 404 tegra_xusb_port_find_lane(struct tegra_xusb_port *port, 405 const struct tegra_xusb_lane_map *map, 406 const char *function) 407 { 408 struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV); 409 410 for (; map->type; map++) { 411 if (port->index != map->port) 412 continue; 413 414 lane = tegra_xusb_find_lane(port->padctl, map->type, 415 map->index); 416 if (IS_ERR(lane)) 417 continue; 418 419 if (!tegra_xusb_lane_check(lane, function)) 420 continue; 421 422 if (!IS_ERR(match)) 423 dev_err(&port->dev, "conflicting match: %s-%u / %s\n", 424 map->type, map->index, match->soc->name); 425 else 426 match = lane; 427 } 428 429 return match; 430 } 431 432 static struct device_node * 433 tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type, 434 unsigned int index) 435 { 436 struct device_node *ports, *np; 437 char *name; 438 439 ports = of_get_child_by_name(padctl->dev->of_node, "ports"); 440 if (!ports) 441 return NULL; 442 443 name = kasprintf(GFP_KERNEL, "%s-%u", type, index); 444 if (!name) { 445 of_node_put(ports); 446 return ERR_PTR(-ENOMEM); 447 } 448 np = of_get_child_by_name(ports, name); 449 kfree(name); 450 of_node_put(ports); 451 452 return np; 453 } 454 455 struct tegra_xusb_port * 456 tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type, 457 unsigned int index) 458 { 459 struct tegra_xusb_port *port; 460 struct device_node *np; 461 462 np = tegra_xusb_find_port_node(padctl, type, index); 463 if (!np) 464 return NULL; 465 466 list_for_each_entry(port, &padctl->ports, list) { 467 if (np == port->dev.of_node) { 468 of_node_put(np); 469 return port; 470 } 471 } 472 473 of_node_put(np); 474 475 return NULL; 476 } 477 478 struct tegra_xusb_usb2_port * 479 tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index) 480 { 481 struct tegra_xusb_port *port; 482 483 port = tegra_xusb_find_port(padctl, "usb2", index); 484 if (port) 485 return to_usb2_port(port); 486 487 return NULL; 488 } 489 490 struct tegra_xusb_usb3_port * 491 tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index) 492 { 493 struct tegra_xusb_port *port; 494 495 port = tegra_xusb_find_port(padctl, "usb3", index); 496 if (port) 497 return to_usb3_port(port); 498 499 return NULL; 500 } 501 502 static void tegra_xusb_port_release(struct device *dev) 503 { 504 } 505 506 static struct device_type tegra_xusb_port_type = { 507 .release = tegra_xusb_port_release, 508 }; 509 510 static int tegra_xusb_port_init(struct tegra_xusb_port *port, 511 struct tegra_xusb_padctl *padctl, 512 struct device_node *np, 513 const char *name, 514 unsigned int index) 515 { 516 int err; 517 518 INIT_LIST_HEAD(&port->list); 519 port->padctl = padctl; 520 port->index = index; 521 522 device_initialize(&port->dev); 523 port->dev.type = &tegra_xusb_port_type; 524 port->dev.of_node = of_node_get(np); 525 port->dev.parent = padctl->dev; 526 527 err = dev_set_name(&port->dev, "%s-%u", name, index); 528 if (err < 0) 529 goto unregister; 530 531 err = device_add(&port->dev); 532 if (err < 0) 533 goto unregister; 534 535 return 0; 536 537 unregister: 538 device_unregister(&port->dev); 539 return err; 540 } 541 542 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port) 543 { 544 device_unregister(&port->dev); 545 } 546 547 static const char *const modes[] = { 548 [USB_DR_MODE_UNKNOWN] = "", 549 [USB_DR_MODE_HOST] = "host", 550 [USB_DR_MODE_PERIPHERAL] = "peripheral", 551 [USB_DR_MODE_OTG] = "otg", 552 }; 553 554 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2) 555 { 556 struct tegra_xusb_port *port = &usb2->base; 557 struct device_node *np = port->dev.of_node; 558 const char *mode; 559 560 usb2->internal = of_property_read_bool(np, "nvidia,internal"); 561 562 if (!of_property_read_string(np, "mode", &mode)) { 563 int err = match_string(modes, ARRAY_SIZE(modes), mode); 564 if (err < 0) { 565 dev_err(&port->dev, "invalid value %s for \"mode\"\n", 566 mode); 567 usb2->mode = USB_DR_MODE_UNKNOWN; 568 } else { 569 usb2->mode = err; 570 } 571 } else { 572 usb2->mode = USB_DR_MODE_HOST; 573 } 574 575 usb2->supply = devm_regulator_get(&port->dev, "vbus"); 576 return PTR_ERR_OR_ZERO(usb2->supply); 577 } 578 579 static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl, 580 unsigned int index) 581 { 582 struct tegra_xusb_usb2_port *usb2; 583 struct device_node *np; 584 int err = 0; 585 586 /* 587 * USB2 ports don't require additional properties, but if the port is 588 * marked as disabled there is no reason to register it. 589 */ 590 np = tegra_xusb_find_port_node(padctl, "usb2", index); 591 if (!np || !of_device_is_available(np)) 592 goto out; 593 594 usb2 = devm_kzalloc(padctl->dev, sizeof(*usb2), GFP_KERNEL); 595 if (!usb2) { 596 err = -ENOMEM; 597 goto out; 598 } 599 600 err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index); 601 if (err < 0) 602 goto out; 603 604 usb2->base.ops = padctl->soc->ports.usb2.ops; 605 606 usb2->base.lane = usb2->base.ops->map(&usb2->base); 607 if (IS_ERR(usb2->base.lane)) { 608 err = PTR_ERR(usb2->base.lane); 609 goto out; 610 } 611 612 err = tegra_xusb_usb2_port_parse_dt(usb2); 613 if (err < 0) { 614 tegra_xusb_port_unregister(&usb2->base); 615 goto out; 616 } 617 618 list_add_tail(&usb2->base.list, &padctl->ports); 619 620 out: 621 of_node_put(np); 622 return err; 623 } 624 625 static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi) 626 { 627 struct tegra_xusb_port *port = &ulpi->base; 628 struct device_node *np = port->dev.of_node; 629 630 ulpi->internal = of_property_read_bool(np, "nvidia,internal"); 631 632 return 0; 633 } 634 635 static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl, 636 unsigned int index) 637 { 638 struct tegra_xusb_ulpi_port *ulpi; 639 struct device_node *np; 640 int err = 0; 641 642 np = tegra_xusb_find_port_node(padctl, "ulpi", index); 643 if (!np || !of_device_is_available(np)) 644 goto out; 645 646 ulpi = devm_kzalloc(padctl->dev, sizeof(*ulpi), GFP_KERNEL); 647 if (!ulpi) { 648 err = -ENOMEM; 649 goto out; 650 } 651 652 err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index); 653 if (err < 0) 654 goto out; 655 656 ulpi->base.ops = padctl->soc->ports.ulpi.ops; 657 658 ulpi->base.lane = ulpi->base.ops->map(&ulpi->base); 659 if (IS_ERR(ulpi->base.lane)) { 660 err = PTR_ERR(ulpi->base.lane); 661 goto out; 662 } 663 664 err = tegra_xusb_ulpi_port_parse_dt(ulpi); 665 if (err < 0) { 666 tegra_xusb_port_unregister(&ulpi->base); 667 goto out; 668 } 669 670 list_add_tail(&ulpi->base.list, &padctl->ports); 671 672 out: 673 of_node_put(np); 674 return err; 675 } 676 677 static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic) 678 { 679 /* XXX */ 680 return 0; 681 } 682 683 static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl, 684 unsigned int index) 685 { 686 struct tegra_xusb_hsic_port *hsic; 687 struct device_node *np; 688 int err = 0; 689 690 np = tegra_xusb_find_port_node(padctl, "hsic", index); 691 if (!np || !of_device_is_available(np)) 692 goto out; 693 694 hsic = devm_kzalloc(padctl->dev, sizeof(*hsic), GFP_KERNEL); 695 if (!hsic) { 696 err = -ENOMEM; 697 goto out; 698 } 699 700 err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index); 701 if (err < 0) 702 goto out; 703 704 hsic->base.ops = padctl->soc->ports.hsic.ops; 705 706 hsic->base.lane = hsic->base.ops->map(&hsic->base); 707 if (IS_ERR(hsic->base.lane)) { 708 err = PTR_ERR(hsic->base.lane); 709 goto out; 710 } 711 712 err = tegra_xusb_hsic_port_parse_dt(hsic); 713 if (err < 0) { 714 tegra_xusb_port_unregister(&hsic->base); 715 goto out; 716 } 717 718 list_add_tail(&hsic->base.list, &padctl->ports); 719 720 out: 721 of_node_put(np); 722 return err; 723 } 724 725 static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3) 726 { 727 struct tegra_xusb_port *port = &usb3->base; 728 struct device_node *np = port->dev.of_node; 729 u32 value; 730 int err; 731 732 err = of_property_read_u32(np, "nvidia,usb2-companion", &value); 733 if (err < 0) { 734 dev_err(&port->dev, "failed to read port: %d\n", err); 735 return err; 736 } 737 738 usb3->port = value; 739 740 usb3->internal = of_property_read_bool(np, "nvidia,internal"); 741 742 usb3->supply = devm_regulator_get(&port->dev, "vbus"); 743 return PTR_ERR_OR_ZERO(usb3->supply); 744 } 745 746 static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl, 747 unsigned int index) 748 { 749 struct tegra_xusb_usb3_port *usb3; 750 struct device_node *np; 751 int err = 0; 752 753 /* 754 * If there is no supplemental configuration in the device tree the 755 * port is unusable. But it is valid to configure only a single port, 756 * hence return 0 instead of an error to allow ports to be optional. 757 */ 758 np = tegra_xusb_find_port_node(padctl, "usb3", index); 759 if (!np || !of_device_is_available(np)) 760 goto out; 761 762 usb3 = devm_kzalloc(padctl->dev, sizeof(*usb3), GFP_KERNEL); 763 if (!usb3) { 764 err = -ENOMEM; 765 goto out; 766 } 767 768 err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index); 769 if (err < 0) 770 goto out; 771 772 usb3->base.ops = padctl->soc->ports.usb3.ops; 773 774 usb3->base.lane = usb3->base.ops->map(&usb3->base); 775 if (IS_ERR(usb3->base.lane)) { 776 err = PTR_ERR(usb3->base.lane); 777 goto out; 778 } 779 780 err = tegra_xusb_usb3_port_parse_dt(usb3); 781 if (err < 0) { 782 tegra_xusb_port_unregister(&usb3->base); 783 goto out; 784 } 785 786 list_add_tail(&usb3->base.list, &padctl->ports); 787 788 out: 789 of_node_put(np); 790 return err; 791 } 792 793 static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl) 794 { 795 struct tegra_xusb_port *port, *tmp; 796 797 list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) { 798 list_del(&port->list); 799 tegra_xusb_port_unregister(port); 800 } 801 } 802 803 static int tegra_xusb_find_unused_usb3_port(struct tegra_xusb_padctl *padctl) 804 { 805 struct device_node *np; 806 unsigned int i; 807 808 for (i = 0; i < padctl->soc->ports.usb3.count; i++) { 809 np = tegra_xusb_find_port_node(padctl, "usb3", i); 810 if (!np || !of_device_is_available(np)) 811 return i; 812 } 813 814 return -ENODEV; 815 } 816 817 static bool tegra_xusb_port_is_companion(struct tegra_xusb_usb2_port *usb2) 818 { 819 unsigned int i; 820 struct tegra_xusb_usb3_port *usb3; 821 struct tegra_xusb_padctl *padctl = usb2->base.padctl; 822 823 for (i = 0; i < padctl->soc->ports.usb3.count; i++) { 824 usb3 = tegra_xusb_find_usb3_port(padctl, i); 825 if (usb3 && usb3->port == usb2->base.index) 826 return true; 827 } 828 829 return false; 830 } 831 832 static int tegra_xusb_update_usb3_fake_port(struct tegra_xusb_usb2_port *usb2) 833 { 834 int fake; 835 836 /* Disable usb3_port_fake usage by default and assign if needed */ 837 usb2->usb3_port_fake = -1; 838 839 if ((usb2->mode == USB_DR_MODE_OTG || 840 usb2->mode == USB_DR_MODE_PERIPHERAL) && 841 !tegra_xusb_port_is_companion(usb2)) { 842 fake = tegra_xusb_find_unused_usb3_port(usb2->base.padctl); 843 if (fake < 0) { 844 dev_err(&usb2->base.dev, "no unused USB3 ports available\n"); 845 return -ENODEV; 846 } 847 848 dev_dbg(&usb2->base.dev, "Found unused usb3 port: %d\n", fake); 849 usb2->usb3_port_fake = fake; 850 } 851 852 return 0; 853 } 854 855 static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl) 856 { 857 struct tegra_xusb_port *port; 858 struct tegra_xusb_usb2_port *usb2; 859 unsigned int i; 860 int err = 0; 861 862 mutex_lock(&padctl->lock); 863 864 for (i = 0; i < padctl->soc->ports.usb2.count; i++) { 865 err = tegra_xusb_add_usb2_port(padctl, i); 866 if (err < 0) 867 goto remove_ports; 868 } 869 870 for (i = 0; i < padctl->soc->ports.ulpi.count; i++) { 871 err = tegra_xusb_add_ulpi_port(padctl, i); 872 if (err < 0) 873 goto remove_ports; 874 } 875 876 for (i = 0; i < padctl->soc->ports.hsic.count; i++) { 877 err = tegra_xusb_add_hsic_port(padctl, i); 878 if (err < 0) 879 goto remove_ports; 880 } 881 882 for (i = 0; i < padctl->soc->ports.usb3.count; i++) { 883 err = tegra_xusb_add_usb3_port(padctl, i); 884 if (err < 0) 885 goto remove_ports; 886 } 887 888 if (padctl->soc->need_fake_usb3_port) { 889 for (i = 0; i < padctl->soc->ports.usb2.count; i++) { 890 usb2 = tegra_xusb_find_usb2_port(padctl, i); 891 if (!usb2) 892 continue; 893 894 err = tegra_xusb_update_usb3_fake_port(usb2); 895 if (err < 0) 896 goto remove_ports; 897 } 898 } 899 900 list_for_each_entry(port, &padctl->ports, list) { 901 err = port->ops->enable(port); 902 if (err < 0) 903 dev_err(padctl->dev, "failed to enable port %s: %d\n", 904 dev_name(&port->dev), err); 905 } 906 907 goto unlock; 908 909 remove_ports: 910 __tegra_xusb_remove_ports(padctl); 911 unlock: 912 mutex_unlock(&padctl->lock); 913 return err; 914 } 915 916 static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl) 917 { 918 mutex_lock(&padctl->lock); 919 __tegra_xusb_remove_ports(padctl); 920 mutex_unlock(&padctl->lock); 921 } 922 923 static int tegra_xusb_padctl_probe(struct platform_device *pdev) 924 { 925 struct device_node *np = pdev->dev.of_node; 926 const struct tegra_xusb_padctl_soc *soc; 927 struct tegra_xusb_padctl *padctl; 928 const struct of_device_id *match; 929 struct resource *res; 930 int err; 931 932 /* for backwards compatibility with old device trees */ 933 np = of_get_child_by_name(np, "pads"); 934 if (!np) { 935 dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n"); 936 return tegra_xusb_padctl_legacy_probe(pdev); 937 } 938 939 of_node_put(np); 940 941 match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node); 942 soc = match->data; 943 944 padctl = soc->ops->probe(&pdev->dev, soc); 945 if (IS_ERR(padctl)) 946 return PTR_ERR(padctl); 947 948 platform_set_drvdata(pdev, padctl); 949 INIT_LIST_HEAD(&padctl->ports); 950 INIT_LIST_HEAD(&padctl->lanes); 951 INIT_LIST_HEAD(&padctl->pads); 952 mutex_init(&padctl->lock); 953 954 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 955 padctl->regs = devm_ioremap_resource(&pdev->dev, res); 956 if (IS_ERR(padctl->regs)) { 957 err = PTR_ERR(padctl->regs); 958 goto remove; 959 } 960 961 padctl->rst = devm_reset_control_get(&pdev->dev, NULL); 962 if (IS_ERR(padctl->rst)) { 963 err = PTR_ERR(padctl->rst); 964 goto remove; 965 } 966 967 padctl->supplies = devm_kcalloc(&pdev->dev, padctl->soc->num_supplies, 968 sizeof(*padctl->supplies), GFP_KERNEL); 969 if (!padctl->supplies) { 970 err = -ENOMEM; 971 goto remove; 972 } 973 974 regulator_bulk_set_supply_names(padctl->supplies, 975 padctl->soc->supply_names, 976 padctl->soc->num_supplies); 977 978 err = devm_regulator_bulk_get(&pdev->dev, padctl->soc->num_supplies, 979 padctl->supplies); 980 if (err < 0) { 981 dev_err(&pdev->dev, "failed to get regulators: %d\n", err); 982 goto remove; 983 } 984 985 err = reset_control_deassert(padctl->rst); 986 if (err < 0) 987 goto remove; 988 989 err = regulator_bulk_enable(padctl->soc->num_supplies, 990 padctl->supplies); 991 if (err < 0) { 992 dev_err(&pdev->dev, "failed to enable supplies: %d\n", err); 993 goto reset; 994 } 995 996 err = tegra_xusb_setup_pads(padctl); 997 if (err < 0) { 998 dev_err(&pdev->dev, "failed to setup pads: %d\n", err); 999 goto power_down; 1000 } 1001 1002 err = tegra_xusb_setup_ports(padctl); 1003 if (err) { 1004 dev_err(&pdev->dev, "failed to setup XUSB ports: %d\n", err); 1005 goto remove_pads; 1006 } 1007 1008 return 0; 1009 1010 remove_pads: 1011 tegra_xusb_remove_pads(padctl); 1012 power_down: 1013 regulator_bulk_disable(padctl->soc->num_supplies, padctl->supplies); 1014 reset: 1015 reset_control_assert(padctl->rst); 1016 remove: 1017 soc->ops->remove(padctl); 1018 return err; 1019 } 1020 1021 static int tegra_xusb_padctl_remove(struct platform_device *pdev) 1022 { 1023 struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev); 1024 int err; 1025 1026 tegra_xusb_remove_ports(padctl); 1027 tegra_xusb_remove_pads(padctl); 1028 1029 err = regulator_bulk_disable(padctl->soc->num_supplies, 1030 padctl->supplies); 1031 if (err < 0) 1032 dev_err(&pdev->dev, "failed to disable supplies: %d\n", err); 1033 1034 err = reset_control_assert(padctl->rst); 1035 if (err < 0) 1036 dev_err(&pdev->dev, "failed to assert reset: %d\n", err); 1037 1038 padctl->soc->ops->remove(padctl); 1039 1040 return err; 1041 } 1042 1043 static struct platform_driver tegra_xusb_padctl_driver = { 1044 .driver = { 1045 .name = "tegra-xusb-padctl", 1046 .of_match_table = tegra_xusb_padctl_of_match, 1047 }, 1048 .probe = tegra_xusb_padctl_probe, 1049 .remove = tegra_xusb_padctl_remove, 1050 }; 1051 module_platform_driver(tegra_xusb_padctl_driver); 1052 1053 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev) 1054 { 1055 struct tegra_xusb_padctl *padctl; 1056 struct platform_device *pdev; 1057 struct device_node *np; 1058 1059 np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0); 1060 if (!np) 1061 return ERR_PTR(-EINVAL); 1062 1063 /* 1064 * This is slightly ugly. A better implementation would be to keep a 1065 * registry of pad controllers, but since there will almost certainly 1066 * only ever be one per SoC that would be a little overkill. 1067 */ 1068 pdev = of_find_device_by_node(np); 1069 if (!pdev) { 1070 of_node_put(np); 1071 return ERR_PTR(-ENODEV); 1072 } 1073 1074 of_node_put(np); 1075 1076 padctl = platform_get_drvdata(pdev); 1077 if (!padctl) { 1078 put_device(&pdev->dev); 1079 return ERR_PTR(-EPROBE_DEFER); 1080 } 1081 1082 return padctl; 1083 } 1084 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get); 1085 1086 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl) 1087 { 1088 if (padctl) 1089 put_device(padctl->dev); 1090 } 1091 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put); 1092 1093 int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl, 1094 unsigned int port) 1095 { 1096 if (padctl->soc->ops->usb3_save_context) 1097 return padctl->soc->ops->usb3_save_context(padctl, port); 1098 1099 return -ENOSYS; 1100 } 1101 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context); 1102 1103 int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl, 1104 unsigned int port, bool idle) 1105 { 1106 if (padctl->soc->ops->hsic_set_idle) 1107 return padctl->soc->ops->hsic_set_idle(padctl, port, idle); 1108 1109 return -ENOSYS; 1110 } 1111 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle); 1112 1113 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl, 1114 unsigned int port, bool enable) 1115 { 1116 if (padctl->soc->ops->usb3_set_lfps_detect) 1117 return padctl->soc->ops->usb3_set_lfps_detect(padctl, port, 1118 enable); 1119 1120 return -ENOSYS; 1121 } 1122 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect); 1123 1124 int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl, 1125 bool val) 1126 { 1127 if (padctl->soc->ops->vbus_override) 1128 return padctl->soc->ops->vbus_override(padctl, val); 1129 1130 return -ENOTSUPP; 1131 } 1132 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_set_vbus_override); 1133 1134 int tegra_phy_xusb_utmi_port_reset(struct phy *phy) 1135 { 1136 struct tegra_xusb_lane *lane = phy_get_drvdata(phy); 1137 struct tegra_xusb_padctl *padctl = lane->pad->padctl; 1138 1139 if (padctl->soc->ops->utmi_port_reset) 1140 return padctl->soc->ops->utmi_port_reset(phy); 1141 1142 return -ENOTSUPP; 1143 } 1144 EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset); 1145 1146 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); 1147 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver"); 1148 MODULE_LICENSE("GPL v2"); 1149