uclass.c 15 KB

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