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 <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); 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 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp) 161 { 162 struct uclass *uc; 163 struct udevice *dev; 164 int ret; 165 166 *devp = NULL; 167 ret = uclass_get(id, &uc); 168 if (ret) 169 return ret; 170 if (list_empty(&uc->dev_head)) 171 return -ENODEV; 172 173 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 174 if (!index--) { 175 *devp = dev; 176 return 0; 177 } 178 } 179 180 return -ENODEV; 181 } 182 183 int uclass_find_first_device(enum uclass_id id, struct udevice **devp) 184 { 185 struct uclass *uc; 186 int ret; 187 188 *devp = NULL; 189 ret = uclass_get(id, &uc); 190 if (ret) 191 return ret; 192 if (list_empty(&uc->dev_head)) 193 return 0; 194 195 *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node); 196 197 return 0; 198 } 199 200 int uclass_find_next_device(struct udevice **devp) 201 { 202 struct udevice *dev = *devp; 203 204 *devp = NULL; 205 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head)) 206 return 0; 207 208 *devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node); 209 210 return 0; 211 } 212 213 int uclass_find_device_by_name(enum uclass_id id, const char *name, 214 struct udevice **devp) 215 { 216 struct uclass *uc; 217 struct udevice *dev; 218 int ret; 219 220 *devp = NULL; 221 if (!name) 222 return -EINVAL; 223 ret = uclass_get(id, &uc); 224 if (ret) 225 return ret; 226 227 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 228 if (!strncmp(dev->name, name, strlen(name))) { 229 *devp = dev; 230 return 0; 231 } 232 } 233 234 return -ENODEV; 235 } 236 237 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq, 238 bool find_req_seq, struct udevice **devp) 239 { 240 struct uclass *uc; 241 struct udevice *dev; 242 int ret; 243 244 *devp = NULL; 245 debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq); 246 if (seq_or_req_seq == -1) 247 return -ENODEV; 248 ret = uclass_get(id, &uc); 249 if (ret) 250 return ret; 251 252 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 253 debug(" - %d %d\n", dev->req_seq, dev->seq); 254 if ((find_req_seq ? dev->req_seq : dev->seq) == 255 seq_or_req_seq) { 256 *devp = dev; 257 debug(" - found\n"); 258 return 0; 259 } 260 } 261 debug(" - not found\n"); 262 263 return -ENODEV; 264 } 265 266 int uclass_find_device_by_of_offset(enum uclass_id id, int node, 267 struct udevice **devp) 268 { 269 struct uclass *uc; 270 struct udevice *dev; 271 int ret; 272 273 *devp = NULL; 274 if (node < 0) 275 return -ENODEV; 276 ret = uclass_get(id, &uc); 277 if (ret) 278 return ret; 279 280 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 281 if (dev->of_offset == node) { 282 *devp = dev; 283 return 0; 284 } 285 } 286 287 return -ENODEV; 288 } 289 290 #if CONFIG_IS_ENABLED(OF_CONTROL) 291 static int uclass_find_device_by_phandle(enum uclass_id id, 292 struct udevice *parent, 293 const char *name, 294 struct udevice **devp) 295 { 296 struct udevice *dev; 297 struct uclass *uc; 298 int find_phandle; 299 int ret; 300 301 *devp = NULL; 302 find_phandle = fdtdec_get_int(gd->fdt_blob, parent->of_offset, name, 303 -1); 304 if (find_phandle <= 0) 305 return -ENOENT; 306 ret = uclass_get(id, &uc); 307 if (ret) 308 return ret; 309 310 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 311 uint phandle = fdt_get_phandle(gd->fdt_blob, dev->of_offset); 312 313 if (phandle == find_phandle) { 314 *devp = dev; 315 return 0; 316 } 317 } 318 319 return -ENODEV; 320 } 321 #endif 322 323 int uclass_get_device_by_driver(enum uclass_id id, 324 const struct driver *find_drv, 325 struct udevice **devp) 326 { 327 struct udevice *dev; 328 struct uclass *uc; 329 int ret; 330 331 ret = uclass_get(id, &uc); 332 if (ret) 333 return ret; 334 335 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 336 if (dev->driver == find_drv) 337 return uclass_get_device_tail(dev, 0, devp); 338 } 339 340 return -ENODEV; 341 } 342 343 int uclass_get_device_tail(struct udevice *dev, int ret, 344 struct udevice **devp) 345 { 346 if (ret) 347 return ret; 348 349 assert(dev); 350 ret = device_probe(dev); 351 if (ret) 352 return ret; 353 354 *devp = dev; 355 356 return 0; 357 } 358 359 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp) 360 { 361 struct udevice *dev; 362 int ret; 363 364 *devp = NULL; 365 ret = uclass_find_device(id, index, &dev); 366 return uclass_get_device_tail(dev, ret, devp); 367 } 368 369 int uclass_get_device_by_name(enum uclass_id id, const char *name, 370 struct udevice **devp) 371 { 372 struct udevice *dev; 373 int ret; 374 375 *devp = NULL; 376 ret = uclass_find_device_by_name(id, name, &dev); 377 return uclass_get_device_tail(dev, ret, devp); 378 } 379 380 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp) 381 { 382 struct udevice *dev; 383 int ret; 384 385 *devp = NULL; 386 ret = uclass_find_device_by_seq(id, seq, false, &dev); 387 if (ret == -ENODEV) { 388 /* 389 * We didn't find it in probed devices. See if there is one 390 * that will request this seq if probed. 391 */ 392 ret = uclass_find_device_by_seq(id, seq, true, &dev); 393 } 394 return uclass_get_device_tail(dev, ret, devp); 395 } 396 397 int uclass_get_device_by_of_offset(enum uclass_id id, int node, 398 struct udevice **devp) 399 { 400 struct udevice *dev; 401 int ret; 402 403 *devp = NULL; 404 ret = uclass_find_device_by_of_offset(id, node, &dev); 405 return uclass_get_device_tail(dev, ret, devp); 406 } 407 408 #if CONFIG_IS_ENABLED(OF_CONTROL) 409 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent, 410 const char *name, struct udevice **devp) 411 { 412 struct udevice *dev; 413 int ret; 414 415 *devp = NULL; 416 ret = uclass_find_device_by_phandle(id, parent, name, &dev); 417 return uclass_get_device_tail(dev, ret, devp); 418 } 419 #endif 420 421 int uclass_first_device(enum uclass_id id, struct udevice **devp) 422 { 423 struct udevice *dev; 424 int ret; 425 426 *devp = NULL; 427 ret = uclass_find_first_device(id, &dev); 428 if (!dev) 429 return 0; 430 return uclass_get_device_tail(dev, ret, devp); 431 } 432 433 int uclass_first_device_err(enum uclass_id id, struct udevice **devp) 434 { 435 int ret; 436 437 ret = uclass_first_device(id, devp); 438 if (ret) 439 return ret; 440 else if (!*devp) 441 return -ENODEV; 442 443 return 0; 444 } 445 446 int uclass_next_device(struct udevice **devp) 447 { 448 struct udevice *dev = *devp; 449 int ret; 450 451 *devp = NULL; 452 ret = uclass_find_next_device(&dev); 453 if (!dev) 454 return 0; 455 return uclass_get_device_tail(dev, ret, devp); 456 } 457 458 int uclass_bind_device(struct udevice *dev) 459 { 460 struct uclass *uc; 461 int ret; 462 463 uc = dev->uclass; 464 list_add_tail(&dev->uclass_node, &uc->dev_head); 465 466 if (dev->parent) { 467 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv; 468 469 if (uc_drv->child_post_bind) { 470 ret = uc_drv->child_post_bind(dev); 471 if (ret) 472 goto err; 473 } 474 } 475 476 return 0; 477 err: 478 /* There is no need to undo the parent's post_bind call */ 479 list_del(&dev->uclass_node); 480 481 return ret; 482 } 483 484 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 485 int uclass_unbind_device(struct udevice *dev) 486 { 487 struct uclass *uc; 488 int ret; 489 490 uc = dev->uclass; 491 if (uc->uc_drv->pre_unbind) { 492 ret = uc->uc_drv->pre_unbind(dev); 493 if (ret) 494 return ret; 495 } 496 497 list_del(&dev->uclass_node); 498 return 0; 499 } 500 #endif 501 502 int uclass_resolve_seq(struct udevice *dev) 503 { 504 struct udevice *dup; 505 int seq; 506 int ret; 507 508 assert(dev->seq == -1); 509 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq, 510 false, &dup); 511 if (!ret) { 512 dm_warn("Device '%s': seq %d is in use by '%s'\n", 513 dev->name, dev->req_seq, dup->name); 514 } else if (ret == -ENODEV) { 515 /* Our requested sequence number is available */ 516 if (dev->req_seq != -1) 517 return dev->req_seq; 518 } else { 519 return ret; 520 } 521 522 for (seq = 0; seq < DM_MAX_SEQ; seq++) { 523 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq, 524 false, &dup); 525 if (ret == -ENODEV) 526 break; 527 if (ret) 528 return ret; 529 } 530 return seq; 531 } 532 533 int uclass_pre_probe_device(struct udevice *dev) 534 { 535 struct uclass_driver *uc_drv; 536 int ret; 537 538 uc_drv = dev->uclass->uc_drv; 539 if (uc_drv->pre_probe) { 540 ret = uc_drv->pre_probe(dev); 541 if (ret) 542 return ret; 543 } 544 545 if (!dev->parent) 546 return 0; 547 uc_drv = dev->parent->uclass->uc_drv; 548 if (uc_drv->child_pre_probe) 549 return uc_drv->child_pre_probe(dev); 550 551 return 0; 552 } 553 554 int uclass_post_probe_device(struct udevice *dev) 555 { 556 struct uclass_driver *uc_drv = dev->uclass->uc_drv; 557 558 if (uc_drv->post_probe) 559 return uc_drv->post_probe(dev); 560 561 return 0; 562 } 563 564 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 565 int uclass_pre_remove_device(struct udevice *dev) 566 { 567 struct uclass *uc; 568 int ret; 569 570 uc = dev->uclass; 571 if (uc->uc_drv->pre_remove) { 572 ret = uc->uc_drv->pre_remove(dev); 573 if (ret) 574 return ret; 575 } 576 577 return 0; 578 } 579 #endif 580