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