1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved. 4 */ 5 6 #include <linux/delay.h> 7 #include <linux/io.h> 8 #include <linux/mailbox_client.h> 9 #include <linux/module.h> 10 #include <linux/of.h> 11 #include <linux/of_device.h> 12 #include <linux/phy/phy.h> 13 #include <linux/phy/tegra/xusb.h> 14 #include <linux/platform_device.h> 15 #include <linux/regulator/consumer.h> 16 #include <linux/reset.h> 17 #include <linux/slab.h> 18 #include <linux/workqueue.h> 19 20 #include <soc/tegra/fuse.h> 21 22 #include "xusb.h" 23 24 static struct phy *tegra_xusb_pad_of_xlate(struct device *dev, 25 struct of_phandle_args *args) 26 { 27 struct tegra_xusb_pad *pad = dev_get_drvdata(dev); 28 struct phy *phy = NULL; 29 unsigned int i; 30 31 if (args->args_count != 0) 32 return ERR_PTR(-EINVAL); 33 34 for (i = 0; i < pad->soc->num_lanes; i++) { 35 if (!pad->lanes[i]) 36 continue; 37 38 if (pad->lanes[i]->dev.of_node == args->np) { 39 phy = pad->lanes[i]; 40 break; 41 } 42 } 43 44 if (phy == NULL) 45 phy = ERR_PTR(-ENODEV); 46 47 return phy; 48 } 49 50 static const struct of_device_id tegra_xusb_padctl_of_match[] = { 51 #if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC) 52 { 53 .compatible = "nvidia,tegra124-xusb-padctl", 54 .data = &tegra124_xusb_padctl_soc, 55 }, 56 #endif 57 #if defined(CONFIG_ARCH_TEGRA_210_SOC) 58 { 59 .compatible = "nvidia,tegra210-xusb-padctl", 60 .data = &tegra210_xusb_padctl_soc, 61 }, 62 #endif 63 #if defined(CONFIG_ARCH_TEGRA_186_SOC) 64 { 65 .compatible = "nvidia,tegra186-xusb-padctl", 66 .data = &tegra186_xusb_padctl_soc, 67 }, 68 #endif 69 #if defined(CONFIG_ARCH_TEGRA_194_SOC) 70 { 71 .compatible = "nvidia,tegra194-xusb-padctl", 72 .data = &tegra194_xusb_padctl_soc, 73 }, 74 #endif 75 { } 76 }; 77 MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match); 78 79 static struct device_node * 80 tegra_xusb_find_pad_node(struct tegra_xusb_padctl *padctl, const char *name) 81 { 82 struct device_node *pads, *np; 83 84 pads = of_get_child_by_name(padctl->dev->of_node, "pads"); 85 if (!pads) 86 return NULL; 87 88 np = of_get_child_by_name(pads, name); 89 of_node_put(pads); 90 91 return np; 92 } 93 94 static struct device_node * 95 tegra_xusb_pad_find_phy_node(struct tegra_xusb_pad *pad, unsigned int index) 96 { 97 struct device_node *np, *lanes; 98 99 lanes = of_get_child_by_name(pad->dev.of_node, "lanes"); 100 if (!lanes) 101 return NULL; 102 103 np = of_get_child_by_name(lanes, pad->soc->lanes[index].name); 104 of_node_put(lanes); 105 106 return np; 107 } 108 109 int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane, 110 struct device_node *np) 111 { 112 struct device *dev = &lane->pad->dev; 113 const char *function; 114 int err; 115 116 err = of_property_read_string(np, "nvidia,function", &function); 117 if (err < 0) 118 return err; 119 120 err = match_string(lane->soc->funcs, lane->soc->num_funcs, function); 121 if (err < 0) { 122 dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n", 123 function, np); 124 return err; 125 } 126 127 lane->function = err; 128 129 return 0; 130 } 131 132 static void tegra_xusb_lane_destroy(struct phy *phy) 133 { 134 if (phy) { 135 struct tegra_xusb_lane *lane = phy_get_drvdata(phy); 136 137 lane->pad->ops->remove(lane); 138 phy_destroy(phy); 139 } 140 } 141 142 static void tegra_xusb_pad_release(struct device *dev) 143 { 144 struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev); 145 146 pad->soc->ops->remove(pad); 147 } 148 149 static struct device_type tegra_xusb_pad_type = { 150 .release = tegra_xusb_pad_release, 151 }; 152 153 int tegra_xusb_pad_init(struct tegra_xusb_pad *pad, 154 struct tegra_xusb_padctl *padctl, 155 struct device_node *np) 156 { 157 int err; 158 159 device_initialize(&pad->dev); 160 INIT_LIST_HEAD(&pad->list); 161 pad->dev.parent = padctl->dev; 162 pad->dev.type = &tegra_xusb_pad_type; 163 pad->dev.of_node = np; 164 pad->padctl = padctl; 165 166 err = dev_set_name(&pad->dev, "%s", pad->soc->name); 167 if (err < 0) 168 goto unregister; 169 170 err = device_add(&pad->dev); 171 if (err < 0) 172 goto unregister; 173 174 return 0; 175 176 unregister: 177 device_unregister(&pad->dev); 178 return err; 179 } 180 181 int tegra_xusb_pad_register(struct tegra_xusb_pad *pad, 182 const struct phy_ops *ops) 183 { 184 struct device_node *children; 185 struct phy *lane; 186 unsigned int i; 187 int err; 188 189 children = of_get_child_by_name(pad->dev.of_node, "lanes"); 190 if (!children) 191 return -ENODEV; 192 193 pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane), 194 GFP_KERNEL); 195 if (!pad->lanes) { 196 of_node_put(children); 197 return -ENOMEM; 198 } 199 200 for (i = 0; i < pad->soc->num_lanes; i++) { 201 struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i); 202 struct tegra_xusb_lane *lane; 203 204 /* skip disabled lanes */ 205 if (!np || !of_device_is_available(np)) { 206 of_node_put(np); 207 continue; 208 } 209 210 pad->lanes[i] = phy_create(&pad->dev, np, ops); 211 if (IS_ERR(pad->lanes[i])) { 212 err = PTR_ERR(pad->lanes[i]); 213 of_node_put(np); 214 goto remove; 215 } 216 217 lane = pad->ops->probe(pad, np, i); 218 if (IS_ERR(lane)) { 219 phy_destroy(pad->lanes[i]); 220 err = PTR_ERR(lane); 221 goto remove; 222 } 223 224 list_add_tail(&lane->list, &pad->padctl->lanes); 225 phy_set_drvdata(pad->lanes[i], lane); 226 } 227 228 pad->provider = of_phy_provider_register_full(&pad->dev, children, 229 tegra_xusb_pad_of_xlate); 230 if (IS_ERR(pad->provider)) { 231 err = PTR_ERR(pad->provider); 232 goto remove; 233 } 234 235 return 0; 236 237 remove: 238 while (i--) 239 tegra_xusb_lane_destroy(pad->lanes[i]); 240 241 of_node_put(children); 242 243 return err; 244 } 245 246 void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad) 247 { 248 unsigned int i = pad->soc->num_lanes; 249 250 of_phy_provider_unregister(pad->provider); 251 252 while (i--) 253 tegra_xusb_lane_destroy(pad->lanes[i]); 254 255 device_unregister(&pad->dev); 256 } 257 258 static struct tegra_xusb_pad * 259 tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl, 260 const struct tegra_xusb_pad_soc *soc) 261 { 262 struct tegra_xusb_pad *pad; 263 struct device_node *np; 264 int err; 265 266 np = tegra_xusb_find_pad_node(padctl, soc->name); 267 if (!np || !of_device_is_available(np)) 268 return NULL; 269 270 pad = soc->ops->probe(padctl, soc, np); 271 if (IS_ERR(pad)) { 272 err = PTR_ERR(pad); 273 dev_err(padctl->dev, "failed to create pad %s: %d\n", 274 soc->name, err); 275 return ERR_PTR(err); 276 } 277 278 /* XXX move this into ->probe() to avoid string comparison */ 279 if (strcmp(soc->name, "pcie") == 0) 280 padctl->pcie = pad; 281 282 if (strcmp(soc->name, "sata") == 0) 283 padctl->sata = pad; 284 285 if (strcmp(soc->name, "usb2") == 0) 286 padctl->usb2 = pad; 287 288 if (strcmp(soc->name, "ulpi") == 0) 289 padctl->ulpi = pad; 290 291 if (strcmp(soc->name, "hsic") == 0) 292 padctl->hsic = pad; 293 294 return pad; 295 } 296 297 static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl) 298 { 299 struct tegra_xusb_pad *pad, *tmp; 300 301 list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) { 302 list_del(&pad->list); 303 tegra_xusb_pad_unregister(pad); 304 } 305 } 306 307 static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl) 308 { 309 mutex_lock(&padctl->lock); 310 __tegra_xusb_remove_pads(padctl); 311 mutex_unlock(&padctl->lock); 312 } 313 314 static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane) 315 { 316 struct tegra_xusb_padctl *padctl = lane->pad->padctl; 317 const struct tegra_xusb_lane_soc *soc = lane->soc; 318 u32 value; 319 320 /* skip single function lanes */ 321 if (soc->num_funcs < 2) 322 return; 323 324 /* choose function */ 325 value = padctl_readl(padctl, soc->offset); 326 value &= ~(soc->mask << soc->shift); 327 value |= lane->function << soc->shift; 328 padctl_writel(padctl, value, soc->offset); 329 } 330 331 static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad) 332 { 333 unsigned int i; 334 335 for (i = 0; i < pad->soc->num_lanes; i++) { 336 struct tegra_xusb_lane *lane; 337 338 if (pad->lanes[i]) { 339 lane = phy_get_drvdata(pad->lanes[i]); 340 tegra_xusb_lane_program(lane); 341 } 342 } 343 } 344 345 static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl) 346 { 347 struct tegra_xusb_pad *pad; 348 unsigned int i; 349 350 mutex_lock(&padctl->lock); 351 352 for (i = 0; i < padctl->soc->num_pads; i++) { 353 const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i]; 354 int err; 355 356 pad = tegra_xusb_pad_create(padctl, soc); 357 if (IS_ERR(pad)) { 358 err = PTR_ERR(pad); 359 dev_err(padctl->dev, "failed to create pad %s: %d\n", 360 soc->name, err); 361 __tegra_xusb_remove_pads(padctl); 362 mutex_unlock(&padctl->lock); 363 return err; 364 } 365 366 if (!pad) 367 continue; 368 369 list_add_tail(&pad->list, &padctl->pads); 370 } 371 372 list_for_each_entry(pad, &padctl->pads, list) 373 tegra_xusb_pad_program(pad); 374 375 mutex_unlock(&padctl->lock); 376 return 0; 377 } 378 379 static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane, 380 const char *function) 381 { 382 const char *func = lane->soc->funcs[lane->function]; 383 384 return strcmp(function, func) == 0; 385 } 386 387 struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl, 388 const char *type, 389 unsigned int index) 390 { 391 struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV); 392 char *name; 393 394 name = kasprintf(GFP_KERNEL, "%s-%u", type, index); 395 if (!name) 396 return ERR_PTR(-ENOMEM); 397 398 list_for_each_entry(lane, &padctl->lanes, list) { 399 if (strcmp(lane->soc->name, name) == 0) { 400 hit = lane; 401 break; 402 } 403 } 404 405 kfree(name); 406 return hit; 407 } 408 409 struct tegra_xusb_lane * 410 tegra_xusb_port_find_lane(struct tegra_xusb_port *port, 411 const struct tegra_xusb_lane_map *map, 412 const char *function) 413 { 414 struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV); 415 416 for (; map->type; map++) { 417 if (port->index != map->port) 418 continue; 419 420 lane = tegra_xusb_find_lane(port->padctl, map->type, 421 map->index); 422 if (IS_ERR(lane)) 423 continue; 424 425 if (!tegra_xusb_lane_check(lane, function)) 426 continue; 427 428 if (!IS_ERR(match)) 429 dev_err(&port->dev, "conflicting match: %s-%u / %s\n", 430 map->type, map->index, match->soc->name); 431 else 432 match = lane; 433 } 434 435 return match; 436 } 437 438 static struct device_node * 439 tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type, 440 unsigned int index) 441 { 442 struct device_node *ports, *np; 443 char *name; 444 445 ports = of_get_child_by_name(padctl->dev->of_node, "ports"); 446 if (!ports) 447 return NULL; 448 449 name = kasprintf(GFP_KERNEL, "%s-%u", type, index); 450 if (!name) { 451 of_node_put(ports); 452 return ERR_PTR(-ENOMEM); 453 } 454 np = of_get_child_by_name(ports, name); 455 kfree(name); 456 of_node_put(ports); 457 458 return np; 459 } 460 461 struct tegra_xusb_port * 462 tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type, 463 unsigned int index) 464 { 465 struct tegra_xusb_port *port; 466 struct device_node *np; 467 468 np = tegra_xusb_find_port_node(padctl, type, index); 469 if (!np) 470 return NULL; 471 472 list_for_each_entry(port, &padctl->ports, list) { 473 if (np == port->dev.of_node) { 474 of_node_put(np); 475 return port; 476 } 477 } 478 479 of_node_put(np); 480 481 return NULL; 482 } 483 484 struct tegra_xusb_usb2_port * 485 tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index) 486 { 487 struct tegra_xusb_port *port; 488 489 port = tegra_xusb_find_port(padctl, "usb2", index); 490 if (port) 491 return to_usb2_port(port); 492 493 return NULL; 494 } 495 496 struct tegra_xusb_usb3_port * 497 tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index) 498 { 499 struct tegra_xusb_port *port; 500 501 port = tegra_xusb_find_port(padctl, "usb3", index); 502 if (port) 503 return to_usb3_port(port); 504 505 return NULL; 506 } 507 508 static void tegra_xusb_port_release(struct device *dev) 509 { 510 struct tegra_xusb_port *port = to_tegra_xusb_port(dev); 511 512 if (port->ops->release) 513 port->ops->release(port); 514 } 515 516 static struct device_type tegra_xusb_port_type = { 517 .release = tegra_xusb_port_release, 518 }; 519 520 static int tegra_xusb_port_init(struct tegra_xusb_port *port, 521 struct tegra_xusb_padctl *padctl, 522 struct device_node *np, 523 const char *name, 524 unsigned int index) 525 { 526 int err; 527 528 INIT_LIST_HEAD(&port->list); 529 port->padctl = padctl; 530 port->index = index; 531 532 device_initialize(&port->dev); 533 port->dev.type = &tegra_xusb_port_type; 534 port->dev.of_node = of_node_get(np); 535 port->dev.parent = padctl->dev; 536 537 err = dev_set_name(&port->dev, "%s-%u", name, index); 538 if (err < 0) 539 goto unregister; 540 541 err = device_add(&port->dev); 542 if (err < 0) 543 goto unregister; 544 545 return 0; 546 547 unregister: 548 device_unregister(&port->dev); 549 return err; 550 } 551 552 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port) 553 { 554 if (!IS_ERR_OR_NULL(port->usb_role_sw)) { 555 of_platform_depopulate(&port->dev); 556 usb_role_switch_unregister(port->usb_role_sw); 557 cancel_work_sync(&port->usb_phy_work); 558 usb_remove_phy(&port->usb_phy); 559 } 560 561 if (port->ops->remove) 562 port->ops->remove(port); 563 564 device_unregister(&port->dev); 565 } 566 567 static const char *const modes[] = { 568 [USB_DR_MODE_UNKNOWN] = "", 569 [USB_DR_MODE_HOST] = "host", 570 [USB_DR_MODE_PERIPHERAL] = "peripheral", 571 [USB_DR_MODE_OTG] = "otg", 572 }; 573 574 static const char * const usb_roles[] = { 575 [USB_ROLE_NONE] = "none", 576 [USB_ROLE_HOST] = "host", 577 [USB_ROLE_DEVICE] = "device", 578 }; 579 580 static enum usb_phy_events to_usb_phy_event(enum usb_role role) 581 { 582 switch (role) { 583 case USB_ROLE_DEVICE: 584 return USB_EVENT_VBUS; 585 586 case USB_ROLE_HOST: 587 return USB_EVENT_ID; 588 589 default: 590 return USB_EVENT_NONE; 591 } 592 } 593 594 static void tegra_xusb_usb_phy_work(struct work_struct *work) 595 { 596 struct tegra_xusb_port *port = container_of(work, 597 struct tegra_xusb_port, 598 usb_phy_work); 599 enum usb_role role = usb_role_switch_get_role(port->usb_role_sw); 600 601 usb_phy_set_event(&port->usb_phy, to_usb_phy_event(role)); 602 603 dev_dbg(&port->dev, "%s(): calling notifier for role %s\n", __func__, 604 usb_roles[role]); 605 606 atomic_notifier_call_chain(&port->usb_phy.notifier, 0, &port->usb_phy); 607 } 608 609 static int tegra_xusb_role_sw_set(struct usb_role_switch *sw, 610 enum usb_role role) 611 { 612 struct tegra_xusb_port *port = usb_role_switch_get_drvdata(sw); 613 614 dev_dbg(&port->dev, "%s(): role %s\n", __func__, usb_roles[role]); 615 616 schedule_work(&port->usb_phy_work); 617 618 return 0; 619 } 620 621 static int tegra_xusb_set_peripheral(struct usb_otg *otg, 622 struct usb_gadget *gadget) 623 { 624 struct tegra_xusb_port *port = container_of(otg->usb_phy, 625 struct tegra_xusb_port, 626 usb_phy); 627 628 if (gadget != NULL) 629 schedule_work(&port->usb_phy_work); 630 631 return 0; 632 } 633 634 static int tegra_xusb_set_host(struct usb_otg *otg, struct usb_bus *host) 635 { 636 struct tegra_xusb_port *port = container_of(otg->usb_phy, 637 struct tegra_xusb_port, 638 usb_phy); 639 640 if (host != NULL) 641 schedule_work(&port->usb_phy_work); 642 643 return 0; 644 } 645 646 647 static int tegra_xusb_setup_usb_role_switch(struct tegra_xusb_port *port) 648 { 649 struct tegra_xusb_lane *lane; 650 struct usb_role_switch_desc role_sx_desc = { 651 .fwnode = dev_fwnode(&port->dev), 652 .set = tegra_xusb_role_sw_set, 653 }; 654 int err = 0; 655 656 /* 657 * USB role switch driver needs parent driver owner info. This is a 658 * suboptimal solution. TODO: Need to revisit this in a follow-up patch 659 * where an optimal solution is possible with changes to USB role 660 * switch driver. 661 */ 662 port->dev.driver = devm_kzalloc(&port->dev, 663 sizeof(struct device_driver), 664 GFP_KERNEL); 665 port->dev.driver->owner = THIS_MODULE; 666 667 port->usb_role_sw = usb_role_switch_register(&port->dev, 668 &role_sx_desc); 669 if (IS_ERR(port->usb_role_sw)) { 670 err = PTR_ERR(port->usb_role_sw); 671 dev_err(&port->dev, "failed to register USB role switch: %d", 672 err); 673 return err; 674 } 675 676 INIT_WORK(&port->usb_phy_work, tegra_xusb_usb_phy_work); 677 usb_role_switch_set_drvdata(port->usb_role_sw, port); 678 679 port->usb_phy.otg = devm_kzalloc(&port->dev, sizeof(struct usb_otg), 680 GFP_KERNEL); 681 if (!port->usb_phy.otg) 682 return -ENOMEM; 683 684 lane = tegra_xusb_find_lane(port->padctl, "usb2", port->index); 685 686 /* 687 * Assign phy dev to usb-phy dev. Host/device drivers can use phy 688 * reference to retrieve usb-phy details. 689 */ 690 port->usb_phy.dev = &lane->pad->lanes[port->index]->dev; 691 port->usb_phy.dev->driver = port->padctl->dev->driver; 692 port->usb_phy.otg->usb_phy = &port->usb_phy; 693 port->usb_phy.otg->set_peripheral = tegra_xusb_set_peripheral; 694 port->usb_phy.otg->set_host = tegra_xusb_set_host; 695 696 err = usb_add_phy_dev(&port->usb_phy); 697 if (err < 0) { 698 dev_err(&port->dev, "Failed to add USB PHY: %d\n", err); 699 return err; 700 } 701 702 /* populate connector entry */ 703 of_platform_populate(port->dev.of_node, NULL, NULL, &port->dev); 704 705 return err; 706 } 707 708 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2) 709 { 710 struct tegra_xusb_port *port = &usb2->base; 711 struct device_node *np = port->dev.of_node; 712 const char *mode; 713 int err; 714 715 usb2->internal = of_property_read_bool(np, "nvidia,internal"); 716 717 if (!of_property_read_string(np, "mode", &mode)) { 718 int err = match_string(modes, ARRAY_SIZE(modes), mode); 719 if (err < 0) { 720 dev_err(&port->dev, "invalid value %s for \"mode\"\n", 721 mode); 722 usb2->mode = USB_DR_MODE_UNKNOWN; 723 } else { 724 usb2->mode = err; 725 } 726 } else { 727 usb2->mode = USB_DR_MODE_HOST; 728 } 729 730 /* usb-role-switch property is mandatory for OTG/Peripheral modes */ 731 if (usb2->mode == USB_DR_MODE_PERIPHERAL || 732 usb2->mode == USB_DR_MODE_OTG) { 733 if (of_property_read_bool(np, "usb-role-switch")) { 734 err = tegra_xusb_setup_usb_role_switch(port); 735 if (err < 0) 736 return err; 737 } else { 738 dev_err(&port->dev, "usb-role-switch not found for %s mode", 739 modes[usb2->mode]); 740 return -EINVAL; 741 } 742 } 743 744 usb2->supply = regulator_get(&port->dev, "vbus"); 745 return PTR_ERR_OR_ZERO(usb2->supply); 746 } 747 748 static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl, 749 unsigned int index) 750 { 751 struct tegra_xusb_usb2_port *usb2; 752 struct device_node *np; 753 int err = 0; 754 755 /* 756 * USB2 ports don't require additional properties, but if the port is 757 * marked as disabled there is no reason to register it. 758 */ 759 np = tegra_xusb_find_port_node(padctl, "usb2", index); 760 if (!np || !of_device_is_available(np)) 761 goto out; 762 763 usb2 = kzalloc(sizeof(*usb2), GFP_KERNEL); 764 if (!usb2) { 765 err = -ENOMEM; 766 goto out; 767 } 768 769 err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index); 770 if (err < 0) 771 goto out; 772 773 usb2->base.ops = padctl->soc->ports.usb2.ops; 774 775 usb2->base.lane = usb2->base.ops->map(&usb2->base); 776 if (IS_ERR(usb2->base.lane)) { 777 err = PTR_ERR(usb2->base.lane); 778 goto out; 779 } 780 781 err = tegra_xusb_usb2_port_parse_dt(usb2); 782 if (err < 0) { 783 tegra_xusb_port_unregister(&usb2->base); 784 goto out; 785 } 786 787 list_add_tail(&usb2->base.list, &padctl->ports); 788 789 out: 790 of_node_put(np); 791 return err; 792 } 793 794 void tegra_xusb_usb2_port_release(struct tegra_xusb_port *port) 795 { 796 struct tegra_xusb_usb2_port *usb2 = to_usb2_port(port); 797 798 kfree(usb2); 799 } 800 801 void tegra_xusb_usb2_port_remove(struct tegra_xusb_port *port) 802 { 803 struct tegra_xusb_usb2_port *usb2 = to_usb2_port(port); 804 805 regulator_put(usb2->supply); 806 } 807 808 static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi) 809 { 810 struct tegra_xusb_port *port = &ulpi->base; 811 struct device_node *np = port->dev.of_node; 812 813 ulpi->internal = of_property_read_bool(np, "nvidia,internal"); 814 815 return 0; 816 } 817 818 static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl, 819 unsigned int index) 820 { 821 struct tegra_xusb_ulpi_port *ulpi; 822 struct device_node *np; 823 int err = 0; 824 825 np = tegra_xusb_find_port_node(padctl, "ulpi", index); 826 if (!np || !of_device_is_available(np)) 827 goto out; 828 829 ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL); 830 if (!ulpi) { 831 err = -ENOMEM; 832 goto out; 833 } 834 835 err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index); 836 if (err < 0) 837 goto out; 838 839 ulpi->base.ops = padctl->soc->ports.ulpi.ops; 840 841 ulpi->base.lane = ulpi->base.ops->map(&ulpi->base); 842 if (IS_ERR(ulpi->base.lane)) { 843 err = PTR_ERR(ulpi->base.lane); 844 goto out; 845 } 846 847 err = tegra_xusb_ulpi_port_parse_dt(ulpi); 848 if (err < 0) { 849 tegra_xusb_port_unregister(&ulpi->base); 850 goto out; 851 } 852 853 list_add_tail(&ulpi->base.list, &padctl->ports); 854 855 out: 856 of_node_put(np); 857 return err; 858 } 859 860 void tegra_xusb_ulpi_port_release(struct tegra_xusb_port *port) 861 { 862 struct tegra_xusb_ulpi_port *ulpi = to_ulpi_port(port); 863 864 kfree(ulpi); 865 } 866 867 static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic) 868 { 869 /* XXX */ 870 return 0; 871 } 872 873 static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl, 874 unsigned int index) 875 { 876 struct tegra_xusb_hsic_port *hsic; 877 struct device_node *np; 878 int err = 0; 879 880 np = tegra_xusb_find_port_node(padctl, "hsic", index); 881 if (!np || !of_device_is_available(np)) 882 goto out; 883 884 hsic = kzalloc(sizeof(*hsic), GFP_KERNEL); 885 if (!hsic) { 886 err = -ENOMEM; 887 goto out; 888 } 889 890 err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index); 891 if (err < 0) 892 goto out; 893 894 hsic->base.ops = padctl->soc->ports.hsic.ops; 895 896 hsic->base.lane = hsic->base.ops->map(&hsic->base); 897 if (IS_ERR(hsic->base.lane)) { 898 err = PTR_ERR(hsic->base.lane); 899 goto out; 900 } 901 902 err = tegra_xusb_hsic_port_parse_dt(hsic); 903 if (err < 0) { 904 tegra_xusb_port_unregister(&hsic->base); 905 goto out; 906 } 907 908 list_add_tail(&hsic->base.list, &padctl->ports); 909 910 out: 911 of_node_put(np); 912 return err; 913 } 914 915 void tegra_xusb_hsic_port_release(struct tegra_xusb_port *port) 916 { 917 struct tegra_xusb_hsic_port *hsic = to_hsic_port(port); 918 919 kfree(hsic); 920 } 921 922 static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3) 923 { 924 struct tegra_xusb_port *port = &usb3->base; 925 struct device_node *np = port->dev.of_node; 926 enum usb_device_speed maximum_speed; 927 u32 value; 928 int err; 929 930 err = of_property_read_u32(np, "nvidia,usb2-companion", &value); 931 if (err < 0) { 932 dev_err(&port->dev, "failed to read port: %d\n", err); 933 return err; 934 } 935 936 usb3->port = value; 937 938 usb3->internal = of_property_read_bool(np, "nvidia,internal"); 939 940 if (device_property_present(&port->dev, "maximum-speed")) { 941 maximum_speed = usb_get_maximum_speed(&port->dev); 942 if (maximum_speed == USB_SPEED_SUPER) 943 usb3->disable_gen2 = true; 944 else if (maximum_speed == USB_SPEED_SUPER_PLUS) 945 usb3->disable_gen2 = false; 946 else 947 return -EINVAL; 948 } 949 950 usb3->supply = regulator_get(&port->dev, "vbus"); 951 return PTR_ERR_OR_ZERO(usb3->supply); 952 } 953 954 static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl, 955 unsigned int index) 956 { 957 struct tegra_xusb_usb3_port *usb3; 958 struct device_node *np; 959 int err = 0; 960 961 /* 962 * If there is no supplemental configuration in the device tree the 963 * port is unusable. But it is valid to configure only a single port, 964 * hence return 0 instead of an error to allow ports to be optional. 965 */ 966 np = tegra_xusb_find_port_node(padctl, "usb3", index); 967 if (!np || !of_device_is_available(np)) 968 goto out; 969 970 usb3 = kzalloc(sizeof(*usb3), GFP_KERNEL); 971 if (!usb3) { 972 err = -ENOMEM; 973 goto out; 974 } 975 976 err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index); 977 if (err < 0) 978 goto out; 979 980 usb3->base.ops = padctl->soc->ports.usb3.ops; 981 982 usb3->base.lane = usb3->base.ops->map(&usb3->base); 983 if (IS_ERR(usb3->base.lane)) { 984 err = PTR_ERR(usb3->base.lane); 985 goto out; 986 } 987 988 err = tegra_xusb_usb3_port_parse_dt(usb3); 989 if (err < 0) { 990 tegra_xusb_port_unregister(&usb3->base); 991 goto out; 992 } 993 994 list_add_tail(&usb3->base.list, &padctl->ports); 995 996 out: 997 of_node_put(np); 998 return err; 999 } 1000 1001 void tegra_xusb_usb3_port_release(struct tegra_xusb_port *port) 1002 { 1003 struct tegra_xusb_usb3_port *usb3 = to_usb3_port(port); 1004 1005 kfree(usb3); 1006 } 1007 1008 void tegra_xusb_usb3_port_remove(struct tegra_xusb_port *port) 1009 { 1010 struct tegra_xusb_usb3_port *usb3 = to_usb3_port(port); 1011 1012 regulator_put(usb3->supply); 1013 } 1014 1015 static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl) 1016 { 1017 struct tegra_xusb_port *port, *tmp; 1018 1019 list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) { 1020 list_del(&port->list); 1021 tegra_xusb_port_unregister(port); 1022 } 1023 } 1024 1025 static int tegra_xusb_find_unused_usb3_port(struct tegra_xusb_padctl *padctl) 1026 { 1027 struct device_node *np; 1028 unsigned int i; 1029 1030 for (i = 0; i < padctl->soc->ports.usb3.count; i++) { 1031 np = tegra_xusb_find_port_node(padctl, "usb3", i); 1032 if (!np || !of_device_is_available(np)) 1033 return i; 1034 } 1035 1036 return -ENODEV; 1037 } 1038 1039 static bool tegra_xusb_port_is_companion(struct tegra_xusb_usb2_port *usb2) 1040 { 1041 unsigned int i; 1042 struct tegra_xusb_usb3_port *usb3; 1043 struct tegra_xusb_padctl *padctl = usb2->base.padctl; 1044 1045 for (i = 0; i < padctl->soc->ports.usb3.count; i++) { 1046 usb3 = tegra_xusb_find_usb3_port(padctl, i); 1047 if (usb3 && usb3->port == usb2->base.index) 1048 return true; 1049 } 1050 1051 return false; 1052 } 1053 1054 static int tegra_xusb_update_usb3_fake_port(struct tegra_xusb_usb2_port *usb2) 1055 { 1056 int fake; 1057 1058 /* Disable usb3_port_fake usage by default and assign if needed */ 1059 usb2->usb3_port_fake = -1; 1060 1061 if ((usb2->mode == USB_DR_MODE_OTG || 1062 usb2->mode == USB_DR_MODE_PERIPHERAL) && 1063 !tegra_xusb_port_is_companion(usb2)) { 1064 fake = tegra_xusb_find_unused_usb3_port(usb2->base.padctl); 1065 if (fake < 0) { 1066 dev_err(&usb2->base.dev, "no unused USB3 ports available\n"); 1067 return -ENODEV; 1068 } 1069 1070 dev_dbg(&usb2->base.dev, "Found unused usb3 port: %d\n", fake); 1071 usb2->usb3_port_fake = fake; 1072 } 1073 1074 return 0; 1075 } 1076 1077 static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl) 1078 { 1079 struct tegra_xusb_port *port; 1080 struct tegra_xusb_usb2_port *usb2; 1081 unsigned int i; 1082 int err = 0; 1083 1084 mutex_lock(&padctl->lock); 1085 1086 for (i = 0; i < padctl->soc->ports.usb2.count; i++) { 1087 err = tegra_xusb_add_usb2_port(padctl, i); 1088 if (err < 0) 1089 goto remove_ports; 1090 } 1091 1092 for (i = 0; i < padctl->soc->ports.ulpi.count; i++) { 1093 err = tegra_xusb_add_ulpi_port(padctl, i); 1094 if (err < 0) 1095 goto remove_ports; 1096 } 1097 1098 for (i = 0; i < padctl->soc->ports.hsic.count; i++) { 1099 err = tegra_xusb_add_hsic_port(padctl, i); 1100 if (err < 0) 1101 goto remove_ports; 1102 } 1103 1104 for (i = 0; i < padctl->soc->ports.usb3.count; i++) { 1105 err = tegra_xusb_add_usb3_port(padctl, i); 1106 if (err < 0) 1107 goto remove_ports; 1108 } 1109 1110 if (padctl->soc->need_fake_usb3_port) { 1111 for (i = 0; i < padctl->soc->ports.usb2.count; i++) { 1112 usb2 = tegra_xusb_find_usb2_port(padctl, i); 1113 if (!usb2) 1114 continue; 1115 1116 err = tegra_xusb_update_usb3_fake_port(usb2); 1117 if (err < 0) 1118 goto remove_ports; 1119 } 1120 } 1121 1122 list_for_each_entry(port, &padctl->ports, list) { 1123 err = port->ops->enable(port); 1124 if (err < 0) 1125 dev_err(padctl->dev, "failed to enable port %s: %d\n", 1126 dev_name(&port->dev), err); 1127 } 1128 1129 goto unlock; 1130 1131 remove_ports: 1132 __tegra_xusb_remove_ports(padctl); 1133 unlock: 1134 mutex_unlock(&padctl->lock); 1135 return err; 1136 } 1137 1138 static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl) 1139 { 1140 mutex_lock(&padctl->lock); 1141 __tegra_xusb_remove_ports(padctl); 1142 mutex_unlock(&padctl->lock); 1143 } 1144 1145 static int tegra_xusb_padctl_probe(struct platform_device *pdev) 1146 { 1147 struct device_node *np = pdev->dev.of_node; 1148 const struct tegra_xusb_padctl_soc *soc; 1149 struct tegra_xusb_padctl *padctl; 1150 const struct of_device_id *match; 1151 struct resource *res; 1152 int err; 1153 1154 /* for backwards compatibility with old device trees */ 1155 np = of_get_child_by_name(np, "pads"); 1156 if (!np) { 1157 dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n"); 1158 return tegra_xusb_padctl_legacy_probe(pdev); 1159 } 1160 1161 of_node_put(np); 1162 1163 match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node); 1164 soc = match->data; 1165 1166 padctl = soc->ops->probe(&pdev->dev, soc); 1167 if (IS_ERR(padctl)) 1168 return PTR_ERR(padctl); 1169 1170 platform_set_drvdata(pdev, padctl); 1171 INIT_LIST_HEAD(&padctl->ports); 1172 INIT_LIST_HEAD(&padctl->lanes); 1173 INIT_LIST_HEAD(&padctl->pads); 1174 mutex_init(&padctl->lock); 1175 1176 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1177 padctl->regs = devm_ioremap_resource(&pdev->dev, res); 1178 if (IS_ERR(padctl->regs)) { 1179 err = PTR_ERR(padctl->regs); 1180 goto remove; 1181 } 1182 1183 padctl->rst = devm_reset_control_get(&pdev->dev, NULL); 1184 if (IS_ERR(padctl->rst)) { 1185 err = PTR_ERR(padctl->rst); 1186 goto remove; 1187 } 1188 1189 padctl->supplies = devm_kcalloc(&pdev->dev, padctl->soc->num_supplies, 1190 sizeof(*padctl->supplies), GFP_KERNEL); 1191 if (!padctl->supplies) { 1192 err = -ENOMEM; 1193 goto remove; 1194 } 1195 1196 regulator_bulk_set_supply_names(padctl->supplies, 1197 padctl->soc->supply_names, 1198 padctl->soc->num_supplies); 1199 1200 err = devm_regulator_bulk_get(&pdev->dev, padctl->soc->num_supplies, 1201 padctl->supplies); 1202 if (err < 0) { 1203 dev_err(&pdev->dev, "failed to get regulators: %d\n", err); 1204 goto remove; 1205 } 1206 1207 err = reset_control_deassert(padctl->rst); 1208 if (err < 0) 1209 goto remove; 1210 1211 err = regulator_bulk_enable(padctl->soc->num_supplies, 1212 padctl->supplies); 1213 if (err < 0) { 1214 dev_err(&pdev->dev, "failed to enable supplies: %d\n", err); 1215 goto reset; 1216 } 1217 1218 err = tegra_xusb_setup_pads(padctl); 1219 if (err < 0) { 1220 dev_err(&pdev->dev, "failed to setup pads: %d\n", err); 1221 goto power_down; 1222 } 1223 1224 err = tegra_xusb_setup_ports(padctl); 1225 if (err) { 1226 const char *level = KERN_ERR; 1227 1228 if (err == -EPROBE_DEFER) 1229 level = KERN_DEBUG; 1230 1231 dev_printk(level, &pdev->dev, 1232 dev_fmt("failed to setup XUSB ports: %d\n"), err); 1233 goto remove_pads; 1234 } 1235 1236 return 0; 1237 1238 remove_pads: 1239 tegra_xusb_remove_pads(padctl); 1240 power_down: 1241 regulator_bulk_disable(padctl->soc->num_supplies, padctl->supplies); 1242 reset: 1243 reset_control_assert(padctl->rst); 1244 remove: 1245 soc->ops->remove(padctl); 1246 return err; 1247 } 1248 1249 static int tegra_xusb_padctl_remove(struct platform_device *pdev) 1250 { 1251 struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev); 1252 int err; 1253 1254 tegra_xusb_remove_ports(padctl); 1255 tegra_xusb_remove_pads(padctl); 1256 1257 err = regulator_bulk_disable(padctl->soc->num_supplies, 1258 padctl->supplies); 1259 if (err < 0) 1260 dev_err(&pdev->dev, "failed to disable supplies: %d\n", err); 1261 1262 err = reset_control_assert(padctl->rst); 1263 if (err < 0) 1264 dev_err(&pdev->dev, "failed to assert reset: %d\n", err); 1265 1266 padctl->soc->ops->remove(padctl); 1267 1268 return err; 1269 } 1270 1271 static struct platform_driver tegra_xusb_padctl_driver = { 1272 .driver = { 1273 .name = "tegra-xusb-padctl", 1274 .of_match_table = tegra_xusb_padctl_of_match, 1275 }, 1276 .probe = tegra_xusb_padctl_probe, 1277 .remove = tegra_xusb_padctl_remove, 1278 }; 1279 module_platform_driver(tegra_xusb_padctl_driver); 1280 1281 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev) 1282 { 1283 struct tegra_xusb_padctl *padctl; 1284 struct platform_device *pdev; 1285 struct device_node *np; 1286 1287 np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0); 1288 if (!np) 1289 return ERR_PTR(-EINVAL); 1290 1291 /* 1292 * This is slightly ugly. A better implementation would be to keep a 1293 * registry of pad controllers, but since there will almost certainly 1294 * only ever be one per SoC that would be a little overkill. 1295 */ 1296 pdev = of_find_device_by_node(np); 1297 if (!pdev) { 1298 of_node_put(np); 1299 return ERR_PTR(-ENODEV); 1300 } 1301 1302 of_node_put(np); 1303 1304 padctl = platform_get_drvdata(pdev); 1305 if (!padctl) { 1306 put_device(&pdev->dev); 1307 return ERR_PTR(-EPROBE_DEFER); 1308 } 1309 1310 return padctl; 1311 } 1312 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get); 1313 1314 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl) 1315 { 1316 if (padctl) 1317 put_device(padctl->dev); 1318 } 1319 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put); 1320 1321 int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl, 1322 unsigned int port) 1323 { 1324 if (padctl->soc->ops->usb3_save_context) 1325 return padctl->soc->ops->usb3_save_context(padctl, port); 1326 1327 return -ENOSYS; 1328 } 1329 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context); 1330 1331 int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl, 1332 unsigned int port, bool idle) 1333 { 1334 if (padctl->soc->ops->hsic_set_idle) 1335 return padctl->soc->ops->hsic_set_idle(padctl, port, idle); 1336 1337 return -ENOSYS; 1338 } 1339 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle); 1340 1341 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl, 1342 unsigned int port, bool enable) 1343 { 1344 if (padctl->soc->ops->usb3_set_lfps_detect) 1345 return padctl->soc->ops->usb3_set_lfps_detect(padctl, port, 1346 enable); 1347 1348 return -ENOSYS; 1349 } 1350 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect); 1351 1352 int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl, 1353 bool val) 1354 { 1355 if (padctl->soc->ops->vbus_override) 1356 return padctl->soc->ops->vbus_override(padctl, val); 1357 1358 return -ENOTSUPP; 1359 } 1360 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_set_vbus_override); 1361 1362 int tegra_phy_xusb_utmi_port_reset(struct phy *phy) 1363 { 1364 struct tegra_xusb_lane *lane = phy_get_drvdata(phy); 1365 struct tegra_xusb_padctl *padctl = lane->pad->padctl; 1366 1367 if (padctl->soc->ops->utmi_port_reset) 1368 return padctl->soc->ops->utmi_port_reset(phy); 1369 1370 return -ENOTSUPP; 1371 } 1372 EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset); 1373 1374 int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl, 1375 unsigned int port) 1376 { 1377 struct tegra_xusb_usb2_port *usb2; 1378 struct tegra_xusb_usb3_port *usb3; 1379 int i; 1380 1381 usb2 = tegra_xusb_find_usb2_port(padctl, port); 1382 if (!usb2) 1383 return -EINVAL; 1384 1385 for (i = 0; i < padctl->soc->ports.usb3.count; i++) { 1386 usb3 = tegra_xusb_find_usb3_port(padctl, i); 1387 if (usb3 && usb3->port == usb2->base.index) 1388 return usb3->base.index; 1389 } 1390 1391 return -ENODEV; 1392 } 1393 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_usb3_companion); 1394 1395 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); 1396 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver"); 1397 MODULE_LICENSE("GPL v2"); 1398