drivers/core/uclass.c

   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 };