1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (c) 2013 Google, Inc 4 * 5 * (C) Copyright 2012 6 * Pavel Herrmann <morpheus.ibis@gmail.com> 7 */ 8 9 #include <common.h> 10 #include <dm.h> 11 #include <errno.h> 12 #include <malloc.h> 13 #include <dm/device.h> 14 #include <dm/device-internal.h> 15 #include <dm/lists.h> 16 #include <dm/uclass.h> 17 #include <dm/uclass-internal.h> 18 #include <dm/util.h> 19 20 DECLARE_GLOBAL_DATA_PTR; 21 22 struct uclass *uclass_find(enum uclass_id key) 23 { 24 struct uclass *uc; 25 26 if (!gd->dm_root) 27 return NULL; 28 /* 29 * TODO(sjg@chromium.org): Optimise this, perhaps moving the found 30 * node to the start of the list, or creating a linear array mapping 31 * id to node. 32 */ 33 list_for_each_entry(uc, &gd->uclass_root, sibling_node) { 34 if (uc->uc_drv->id == key) 35 return uc; 36 } 37 38 return NULL; 39 } 40 41 /** 42 * uclass_add() - Create new uclass in list 43 * @id: Id number to create 44 * @ucp: Returns pointer to uclass, or NULL on error 45 * @return 0 on success, -ve on error 46 * 47 * The new uclass is added to the list. There must be only one uclass for 48 * each id. 49 */ 50 static int uclass_add(enum uclass_id id, struct uclass **ucp) 51 { 52 struct uclass_driver *uc_drv; 53 struct uclass *uc; 54 int ret; 55 56 *ucp = NULL; 57 uc_drv = lists_uclass_lookup(id); 58 if (!uc_drv) { 59 debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n", 60 id); 61 /* 62 * Use a strange error to make this case easier to find. When 63 * a uclass is not available it can prevent driver model from 64 * starting up and this failure is otherwise hard to debug. 65 */ 66 return -EPFNOSUPPORT; 67 } 68 uc = calloc(1, sizeof(*uc)); 69 if (!uc) 70 return -ENOMEM; 71 if (uc_drv->priv_auto_alloc_size) { 72 uc->priv = calloc(1, uc_drv->priv_auto_alloc_size); 73 if (!uc->priv) { 74 ret = -ENOMEM; 75 goto fail_mem; 76 } 77 } 78 uc->uc_drv = uc_drv; 79 INIT_LIST_HEAD(&uc->sibling_node); 80 INIT_LIST_HEAD(&uc->dev_head); 81 list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST); 82 83 if (uc_drv->init) { 84 ret = uc_drv->init(uc); 85 if (ret) 86 goto fail; 87 } 88 89 *ucp = uc; 90 91 return 0; 92 fail: 93 if (uc_drv->priv_auto_alloc_size) { 94 free(uc->priv); 95 uc->priv = NULL; 96 } 97 list_del(&uc->sibling_node); 98 fail_mem: 99 free(uc); 100 101 return ret; 102 } 103 104 int uclass_destroy(struct uclass *uc) 105 { 106 struct uclass_driver *uc_drv; 107 struct udevice *dev; 108 int ret; 109 110 /* 111 * We cannot use list_for_each_entry_safe() here. If a device in this 112 * uclass has a child device also in this uclass, it will be also be 113 * unbound (by the recursion in the call to device_unbind() below). 114 * We can loop until the list is empty. 115 */ 116 while (!list_empty(&uc->dev_head)) { 117 dev = list_first_entry(&uc->dev_head, struct udevice, 118 uclass_node); 119 ret = device_remove(dev, DM_REMOVE_NORMAL); 120 if (ret) 121 return ret; 122 ret = device_unbind(dev); 123 if (ret) 124 return ret; 125 } 126 127 uc_drv = uc->uc_drv; 128 if (uc_drv->destroy) 129 uc_drv->destroy(uc); 130 list_del(&uc->sibling_node); 131 if (uc_drv->priv_auto_alloc_size) 132 free(uc->priv); 133 free(uc); 134 135 return 0; 136 } 137 138 int uclass_get(enum uclass_id id, struct uclass **ucp) 139 { 140 struct uclass *uc; 141 142 *ucp = NULL; 143 uc = uclass_find(id); 144 if (!uc) 145 return uclass_add(id, ucp); 146 *ucp = uc; 147 148 return 0; 149 } 150 151 const char *uclass_get_name(enum uclass_id id) 152 { 153 struct uclass *uc; 154 155 if (uclass_get(id, &uc)) 156 return NULL; 157 return uc->uc_drv->name; 158 } 159 160 enum uclass_id uclass_get_by_name(const char *name) 161 { 162 int i; 163 164 for (i = 0; i < UCLASS_COUNT; i++) { 165 struct uclass_driver *uc_drv = lists_uclass_lookup(i); 166 167 if (uc_drv && !strcmp(uc_drv->name, name)) 168 return i; 169 } 170 171 return UCLASS_INVALID; 172 } 173 174 int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp) 175 { 176 struct udevice *iter; 177 struct uclass *uc = dev->uclass; 178 int i = 0; 179 180 if (list_empty(&uc->dev_head)) 181 return -ENODEV; 182 183 uclass_foreach_dev(iter, uc) { 184 if (iter == dev) { 185 if (ucp) 186 *ucp = uc; 187 return i; 188 } 189 i++; 190 } 191 192 return -ENODEV; 193 } 194 195 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp) 196 { 197 struct uclass *uc; 198 struct udevice *dev; 199 int ret; 200 201 *devp = NULL; 202 ret = uclass_get(id, &uc); 203 if (ret) 204 return ret; 205 if (list_empty(&uc->dev_head)) 206 return -ENODEV; 207 208 uclass_foreach_dev(dev, uc) { 209 if (!index--) { 210 *devp = dev; 211 return 0; 212 } 213 } 214 215 return -ENODEV; 216 } 217 218 int uclass_find_first_device(enum uclass_id id, struct udevice **devp) 219 { 220 struct uclass *uc; 221 int ret; 222 223 *devp = NULL; 224 ret = uclass_get(id, &uc); 225 if (ret) 226 return ret; 227 if (list_empty(&uc->dev_head)) 228 return -ENODEV; 229 230 *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node); 231 232 return 0; 233 } 234 235 int uclass_find_next_device(struct udevice **devp) 236 { 237 struct udevice *dev = *devp; 238 239 *devp = NULL; 240 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head)) 241 return 0; 242 243 *devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node); 244 245 return 0; 246 } 247 248 int uclass_find_device_by_name(enum uclass_id id, const char *name, 249 struct udevice **devp) 250 { 251 struct uclass *uc; 252 struct udevice *dev; 253 int ret; 254 255 *devp = NULL; 256 if (!name) 257 return -EINVAL; 258 ret = uclass_get(id, &uc); 259 if (ret) 260 return ret; 261 262 uclass_foreach_dev(dev, uc) { 263 if (!strncmp(dev->name, name, strlen(name))) { 264 *devp = dev; 265 return 0; 266 } 267 } 268 269 return -ENODEV; 270 } 271 272 #if !CONFIG_IS_ENABLED(OF_CONTROL) || CONFIG_IS_ENABLED(OF_PLATDATA) 273 int uclass_find_next_free_req_seq(enum uclass_id id) 274 { 275 struct uclass *uc; 276 struct udevice *dev; 277 int ret; 278 int max = -1; 279 280 ret = uclass_get(id, &uc); 281 if (ret) 282 return ret; 283 284 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 285 if ((dev->req_seq != -1) && (dev->req_seq > max)) 286 max = dev->req_seq; 287 } 288 289 if (max == -1) 290 return 0; 291 292 return max + 1; 293 } 294 #endif 295 296 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq, 297 bool find_req_seq, struct udevice **devp) 298 { 299 struct uclass *uc; 300 struct udevice *dev; 301 int ret; 302 303 *devp = NULL; 304 debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq); 305 if (seq_or_req_seq == -1) 306 return -ENODEV; 307 ret = uclass_get(id, &uc); 308 if (ret) 309 return ret; 310 311 uclass_foreach_dev(dev, uc) { 312 debug(" - %d %d '%s'\n", dev->req_seq, dev->seq, dev->name); 313 if ((find_req_seq ? dev->req_seq : dev->seq) == 314 seq_or_req_seq) { 315 *devp = dev; 316 debug(" - found\n"); 317 return 0; 318 } 319 } 320 debug(" - not found\n"); 321 322 return -ENODEV; 323 } 324 325 int uclass_find_device_by_of_offset(enum uclass_id id, int node, 326 struct udevice **devp) 327 { 328 struct uclass *uc; 329 struct udevice *dev; 330 int ret; 331 332 *devp = NULL; 333 if (node < 0) 334 return -ENODEV; 335 ret = uclass_get(id, &uc); 336 if (ret) 337 return ret; 338 339 uclass_foreach_dev(dev, uc) { 340 if (dev_of_offset(dev) == node) { 341 *devp = dev; 342 return 0; 343 } 344 } 345 346 return -ENODEV; 347 } 348 349 int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node, 350 struct udevice **devp) 351 { 352 struct uclass *uc; 353 struct udevice *dev; 354 int ret; 355 356 log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node)); 357 *devp = NULL; 358 if (!ofnode_valid(node)) 359 return -ENODEV; 360 ret = uclass_get(id, &uc); 361 if (ret) 362 return ret; 363 364 uclass_foreach_dev(dev, uc) { 365 log(LOGC_DM, LOGL_DEBUG_CONTENT, " - checking %s\n", 366 dev->name); 367 if (ofnode_equal(dev_ofnode(dev), node)) { 368 *devp = dev; 369 goto done; 370 } 371 } 372 ret = -ENODEV; 373 374 done: 375 log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n", 376 ofnode_get_name(node), *devp ? (*devp)->name : "(none)", ret); 377 return ret; 378 } 379 380 #if CONFIG_IS_ENABLED(OF_CONTROL) 381 int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent, 382 const char *name, struct udevice **devp) 383 { 384 struct udevice *dev; 385 struct uclass *uc; 386 int find_phandle; 387 int ret; 388 389 *devp = NULL; 390 find_phandle = dev_read_u32_default(parent, name, -1); 391 if (find_phandle <= 0) 392 return -ENOENT; 393 ret = uclass_get(id, &uc); 394 if (ret) 395 return ret; 396 397 uclass_foreach_dev(dev, uc) { 398 uint phandle; 399 400 phandle = dev_read_phandle(dev); 401 402 if (phandle == find_phandle) { 403 *devp = dev; 404 return 0; 405 } 406 } 407 408 return -ENODEV; 409 } 410 #endif 411 412 int uclass_get_device_by_driver(enum uclass_id id, 413 const struct driver *find_drv, 414 struct udevice **devp) 415 { 416 struct udevice *dev; 417 struct uclass *uc; 418 int ret; 419 420 ret = uclass_get(id, &uc); 421 if (ret) 422 return ret; 423 424 uclass_foreach_dev(dev, uc) { 425 if (dev->driver == find_drv) 426 return uclass_get_device_tail(dev, 0, devp); 427 } 428 429 return -ENODEV; 430 } 431 432 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp) 433 { 434 if (ret) 435 return ret; 436 437 assert(dev); 438 ret = device_probe(dev); 439 if (ret) 440 return ret; 441 442 *devp = dev; 443 444 return 0; 445 } 446 447 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp) 448 { 449 struct udevice *dev; 450 int ret; 451 452 *devp = NULL; 453 ret = uclass_find_device(id, index, &dev); 454 return uclass_get_device_tail(dev, ret, devp); 455 } 456 457 int uclass_get_device_by_name(enum uclass_id id, const char *name, 458 struct udevice **devp) 459 { 460 struct udevice *dev; 461 int ret; 462 463 *devp = NULL; 464 ret = uclass_find_device_by_name(id, name, &dev); 465 return uclass_get_device_tail(dev, ret, devp); 466 } 467 468 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp) 469 { 470 struct udevice *dev; 471 int ret; 472 473 *devp = NULL; 474 ret = uclass_find_device_by_seq(id, seq, false, &dev); 475 if (ret == -ENODEV) { 476 /* 477 * We didn't find it in probed devices. See if there is one 478 * that will request this seq if probed. 479 */ 480 ret = uclass_find_device_by_seq(id, seq, true, &dev); 481 } 482 return uclass_get_device_tail(dev, ret, devp); 483 } 484 485 int uclass_get_device_by_of_offset(enum uclass_id id, int node, 486 struct udevice **devp) 487 { 488 struct udevice *dev; 489 int ret; 490 491 *devp = NULL; 492 ret = uclass_find_device_by_of_offset(id, node, &dev); 493 return uclass_get_device_tail(dev, ret, devp); 494 } 495 496 int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node, 497 struct udevice **devp) 498 { 499 struct udevice *dev; 500 int ret; 501 502 log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node)); 503 *devp = NULL; 504 ret = uclass_find_device_by_ofnode(id, node, &dev); 505 log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n", 506 ofnode_get_name(node), dev ? dev->name : "(none)", ret); 507 508 return uclass_get_device_tail(dev, ret, devp); 509 } 510 511 #if CONFIG_IS_ENABLED(OF_CONTROL) 512 int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id, 513 struct udevice **devp) 514 { 515 struct udevice *dev; 516 struct uclass *uc; 517 int ret; 518 519 *devp = NULL; 520 ret = uclass_get(id, &uc); 521 if (ret) 522 return ret; 523 524 uclass_foreach_dev(dev, uc) { 525 uint phandle; 526 527 phandle = dev_read_phandle(dev); 528 529 if (phandle == phandle_id) { 530 *devp = dev; 531 return uclass_get_device_tail(dev, ret, devp); 532 } 533 } 534 535 return -ENODEV; 536 } 537 538 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent, 539 const char *name, struct udevice **devp) 540 { 541 struct udevice *dev; 542 int ret; 543 544 *devp = NULL; 545 ret = uclass_find_device_by_phandle(id, parent, name, &dev); 546 return uclass_get_device_tail(dev, ret, devp); 547 } 548 #endif 549 550 int uclass_first_device(enum uclass_id id, struct udevice **devp) 551 { 552 struct udevice *dev; 553 int ret; 554 555 *devp = NULL; 556 ret = uclass_find_first_device(id, &dev); 557 if (!dev) 558 return 0; 559 return uclass_get_device_tail(dev, ret, devp); 560 } 561 562 int uclass_first_device_err(enum uclass_id id, struct udevice **devp) 563 { 564 int ret; 565 566 ret = uclass_first_device(id, devp); 567 if (ret) 568 return ret; 569 else if (!*devp) 570 return -ENODEV; 571 572 return 0; 573 } 574 575 int uclass_next_device(struct udevice **devp) 576 { 577 struct udevice *dev = *devp; 578 int ret; 579 580 *devp = NULL; 581 ret = uclass_find_next_device(&dev); 582 if (!dev) 583 return 0; 584 return uclass_get_device_tail(dev, ret, devp); 585 } 586 587 int uclass_next_device_err(struct udevice **devp) 588 { 589 int ret; 590 591 ret = uclass_next_device(devp); 592 if (ret) 593 return ret; 594 else if (!*devp) 595 return -ENODEV; 596 597 return 0; 598 } 599 600 int uclass_first_device_check(enum uclass_id id, struct udevice **devp) 601 { 602 int ret; 603 604 *devp = NULL; 605 ret = uclass_find_first_device(id, devp); 606 if (ret) 607 return ret; 608 if (!*devp) 609 return 0; 610 611 return device_probe(*devp); 612 } 613 614 int uclass_next_device_check(struct udevice **devp) 615 { 616 int ret; 617 618 ret = uclass_find_next_device(devp); 619 if (ret) 620 return ret; 621 if (!*devp) 622 return 0; 623 624 return device_probe(*devp); 625 } 626 627 int uclass_bind_device(struct udevice *dev) 628 { 629 struct uclass *uc; 630 int ret; 631 632 uc = dev->uclass; 633 list_add_tail(&dev->uclass_node, &uc->dev_head); 634 635 if (dev->parent) { 636 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv; 637 638 if (uc_drv->child_post_bind) { 639 ret = uc_drv->child_post_bind(dev); 640 if (ret) 641 goto err; 642 } 643 } 644 645 return 0; 646 err: 647 /* There is no need to undo the parent's post_bind call */ 648 list_del(&dev->uclass_node); 649 650 return ret; 651 } 652 653 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 654 int uclass_unbind_device(struct udevice *dev) 655 { 656 struct uclass *uc; 657 int ret; 658 659 uc = dev->uclass; 660 if (uc->uc_drv->pre_unbind) { 661 ret = uc->uc_drv->pre_unbind(dev); 662 if (ret) 663 return ret; 664 } 665 666 list_del(&dev->uclass_node); 667 return 0; 668 } 669 #endif 670 671 int uclass_resolve_seq(struct udevice *dev) 672 { 673 struct udevice *dup; 674 int seq; 675 int ret; 676 677 assert(dev->seq == -1); 678 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq, 679 false, &dup); 680 if (!ret) { 681 dm_warn("Device '%s': seq %d is in use by '%s'\n", 682 dev->name, dev->req_seq, dup->name); 683 } else if (ret == -ENODEV) { 684 /* Our requested sequence number is available */ 685 if (dev->req_seq != -1) 686 return dev->req_seq; 687 } else { 688 return ret; 689 } 690 691 for (seq = 0; seq < DM_MAX_SEQ; seq++) { 692 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq, 693 false, &dup); 694 if (ret == -ENODEV) 695 break; 696 if (ret) 697 return ret; 698 } 699 return seq; 700 } 701 702 int uclass_pre_probe_device(struct udevice *dev) 703 { 704 struct uclass_driver *uc_drv; 705 int ret; 706 707 uc_drv = dev->uclass->uc_drv; 708 if (uc_drv->pre_probe) { 709 ret = uc_drv->pre_probe(dev); 710 if (ret) 711 return ret; 712 } 713 714 if (!dev->parent) 715 return 0; 716 uc_drv = dev->parent->uclass->uc_drv; 717 if (uc_drv->child_pre_probe) 718 return uc_drv->child_pre_probe(dev); 719 720 return 0; 721 } 722 723 int uclass_post_probe_device(struct udevice *dev) 724 { 725 struct uclass_driver *uc_drv; 726 int ret; 727 728 if (dev->parent) { 729 uc_drv = dev->parent->uclass->uc_drv; 730 if (uc_drv->child_post_probe) { 731 ret = uc_drv->child_post_probe(dev); 732 if (ret) 733 return ret; 734 } 735 } 736 737 uc_drv = dev->uclass->uc_drv; 738 if (uc_drv->post_probe) 739 return uc_drv->post_probe(dev); 740 741 return 0; 742 } 743 744 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 745 int uclass_pre_remove_device(struct udevice *dev) 746 { 747 struct uclass *uc; 748 int ret; 749 750 uc = dev->uclass; 751 if (uc->uc_drv->pre_remove) { 752 ret = uc->uc_drv->pre_remove(dev); 753 if (ret) 754 return ret; 755 } 756 757 return 0; 758 } 759 #endif 760 761 UCLASS_DRIVER(nop) = { 762 .id = UCLASS_NOP, 763 .name = "nop", 764 }; 765