1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
9 #define LOG_CATEGORY LOGC_DM
16 #include <asm/global_data.h>
17 #include <dm/device.h>
18 #include <dm/device-internal.h>
20 #include <dm/uclass.h>
21 #include <dm/uclass-internal.h>
24 DECLARE_GLOBAL_DATA_PTR;
26 struct uclass *uclass_find(enum uclass_id key)
33 * TODO(sjg@chromium.org): Optimise this, perhaps moving the found
34 * node to the start of the list, or creating a linear array mapping
37 list_for_each_entry(uc, gd->uclass_root, sibling_node) {
38 if (uc->uc_drv->id == key)
46 * uclass_add() - Create new uclass in list
47 * @id: Id number to create
48 * @ucp: Returns pointer to uclass, or NULL on error
49 * @return 0 on success, -ve on error
51 * The new uclass is added to the list. There must be only one uclass for
54 static int uclass_add(enum uclass_id id, struct uclass **ucp)
56 struct uclass_driver *uc_drv;
61 uc_drv = lists_uclass_lookup(id);
63 debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
66 * Use a strange error to make this case easier to find. When
67 * a uclass is not available it can prevent driver model from
68 * starting up and this failure is otherwise hard to debug.
72 uc = calloc(1, sizeof(*uc));
75 if (uc_drv->priv_auto) {
78 ptr = calloc(1, uc_drv->priv_auto);
83 uclass_set_priv(uc, ptr);
86 INIT_LIST_HEAD(&uc->sibling_node);
87 INIT_LIST_HEAD(&uc->dev_head);
88 list_add(&uc->sibling_node, DM_UCLASS_ROOT_NON_CONST);
91 ret = uc_drv->init(uc);
100 if (uc_drv->priv_auto) {
101 free(uclass_get_priv(uc));
102 uclass_set_priv(uc, NULL);
104 list_del(&uc->sibling_node);
111 int uclass_destroy(struct uclass *uc)
113 struct uclass_driver *uc_drv;
118 * We cannot use list_for_each_entry_safe() here. If a device in this
119 * uclass has a child device also in this uclass, it will be also be
120 * unbound (by the recursion in the call to device_unbind() below).
121 * We can loop until the list is empty.
123 while (!list_empty(&uc->dev_head)) {
124 dev = list_first_entry(&uc->dev_head, struct udevice,
126 ret = device_remove(dev, DM_REMOVE_NORMAL | DM_REMOVE_NO_PD);
128 return log_msg_ret("remove", ret);
129 ret = device_unbind(dev);
131 return log_msg_ret("unbind", ret);
137 list_del(&uc->sibling_node);
138 if (uc_drv->priv_auto)
139 free(uclass_get_priv(uc));
145 int uclass_get(enum uclass_id id, struct uclass **ucp)
150 uc = uclass_find(id);
152 return uclass_add(id, ucp);
158 const char *uclass_get_name(enum uclass_id id)
162 if (uclass_get(id, &uc))
164 return uc->uc_drv->name;
167 void *uclass_get_priv(const struct uclass *uc)
172 void uclass_set_priv(struct uclass *uc, void *priv)
177 enum uclass_id uclass_get_by_name(const char *name)
181 for (i = 0; i < UCLASS_COUNT; i++) {
182 struct uclass_driver *uc_drv = lists_uclass_lookup(i);
184 if (uc_drv && !strcmp(uc_drv->name, name))
188 return UCLASS_INVALID;
191 int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp)
193 struct udevice *iter;
194 struct uclass *uc = dev->uclass;
197 if (list_empty(&uc->dev_head))
200 uclass_foreach_dev(iter, uc) {
212 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
219 ret = uclass_get(id, &uc);
222 if (list_empty(&uc->dev_head))
225 uclass_foreach_dev(dev, uc) {
235 int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
241 ret = uclass_get(id, &uc);
244 if (list_empty(&uc->dev_head))
247 *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
252 int uclass_find_next_device(struct udevice **devp)
254 struct udevice *dev = *devp;
257 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
260 *devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
265 int uclass_find_device_by_name(enum uclass_id id, const char *name,
266 struct udevice **devp)
275 ret = uclass_get(id, &uc);
279 uclass_foreach_dev(dev, uc) {
280 if (!strcmp(dev->name, name)) {
289 int uclass_find_next_free_seq(struct uclass *uc)
294 /* If using aliases, start with the highest alias value */
295 if (CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
296 (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS))
297 max = dev_read_alias_highest_id(uc->uc_drv->name);
299 /* Avoid conflict with existing devices */
300 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
305 * At this point, max will be -1 if there are no existing aliases or
312 int uclass_find_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
319 log_debug("%d\n", seq);
322 ret = uclass_get(id, &uc);
326 uclass_foreach_dev(dev, uc) {
327 log_debug(" - %d '%s'\n", dev->seq_, dev->name);
328 if (dev->seq_ == seq) {
330 log_debug(" - found\n");
334 log_debug(" - not found\n");
339 int uclass_find_device_by_of_offset(enum uclass_id id, int node,
340 struct udevice **devp)
349 ret = uclass_get(id, &uc);
353 uclass_foreach_dev(dev, uc) {
354 if (dev_of_offset(dev) == node) {
363 int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
364 struct udevice **devp)
370 log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
372 if (!ofnode_valid(node))
374 ret = uclass_get(id, &uc);
378 uclass_foreach_dev(dev, uc) {
379 log(LOGC_DM, LOGL_DEBUG_CONTENT, " - checking %s\n",
381 if (ofnode_equal(dev_ofnode(dev), node)) {
389 log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
390 ofnode_get_name(node), *devp ? (*devp)->name : "(none)", ret);
394 #if CONFIG_IS_ENABLED(OF_CONTROL)
395 int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent,
396 const char *name, struct udevice **devp)
404 find_phandle = dev_read_u32_default(parent, name, -1);
405 if (find_phandle <= 0)
407 ret = uclass_get(id, &uc);
411 uclass_foreach_dev(dev, uc) {
414 phandle = dev_read_phandle(dev);
416 if (phandle == find_phandle) {
426 int uclass_get_device_by_driver(enum uclass_id id,
427 const struct driver *find_drv,
428 struct udevice **devp)
434 ret = uclass_get(id, &uc);
438 uclass_foreach_dev(dev, uc) {
439 if (dev->driver == find_drv)
440 return uclass_get_device_tail(dev, 0, devp);
446 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp)
452 ret = device_probe(dev);
461 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
467 ret = uclass_find_device(id, index, &dev);
468 return uclass_get_device_tail(dev, ret, devp);
471 int uclass_get_device_by_name(enum uclass_id id, const char *name,
472 struct udevice **devp)
478 ret = uclass_find_device_by_name(id, name, &dev);
479 return uclass_get_device_tail(dev, ret, devp);
482 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
488 ret = uclass_find_device_by_seq(id, seq, &dev);
490 return uclass_get_device_tail(dev, ret, devp);
493 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
494 struct udevice **devp)
500 ret = uclass_find_device_by_of_offset(id, node, &dev);
501 return uclass_get_device_tail(dev, ret, devp);
504 int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
505 struct udevice **devp)
510 log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
512 ret = uclass_find_device_by_ofnode(id, node, &dev);
513 log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
514 ofnode_get_name(node), dev ? dev->name : "(none)", ret);
516 return uclass_get_device_tail(dev, ret, devp);
519 #if CONFIG_IS_ENABLED(OF_CONTROL)
520 int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
521 struct udevice **devp)
528 ret = uclass_get(id, &uc);
532 uclass_foreach_dev(dev, uc) {
535 phandle = dev_read_phandle(dev);
537 if (phandle == phandle_id) {
539 return uclass_get_device_tail(dev, ret, devp);
546 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
547 const char *name, struct udevice **devp)
553 ret = uclass_find_device_by_phandle(id, parent, name, &dev);
554 return uclass_get_device_tail(dev, ret, devp);
558 int uclass_first_device(enum uclass_id id, struct udevice **devp)
564 ret = uclass_find_first_device(id, &dev);
567 return uclass_get_device_tail(dev, ret, devp);
570 int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
574 ret = uclass_first_device(id, devp);
583 int uclass_next_device(struct udevice **devp)
585 struct udevice *dev = *devp;
589 ret = uclass_find_next_device(&dev);
592 return uclass_get_device_tail(dev, ret, devp);
595 int uclass_next_device_err(struct udevice **devp)
599 ret = uclass_next_device(devp);
608 int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
613 ret = uclass_find_first_device(id, devp);
619 return device_probe(*devp);
622 int uclass_next_device_check(struct udevice **devp)
626 ret = uclass_find_next_device(devp);
632 return device_probe(*devp);
635 int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data,
636 struct udevice **devp)
641 uclass_id_foreach_dev(id, dev, uc) {
642 if (dev_get_driver_data(dev) == driver_data) {
645 return device_probe(dev);
652 int uclass_bind_device(struct udevice *dev)
658 list_add_tail(&dev->uclass_node, &uc->dev_head);
661 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
663 if (uc_drv->child_post_bind) {
664 ret = uc_drv->child_post_bind(dev);
672 /* There is no need to undo the parent's post_bind call */
673 list_del(&dev->uclass_node);
678 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
679 int uclass_unbind_device(struct udevice *dev)
685 if (uc->uc_drv->pre_unbind) {
686 ret = uc->uc_drv->pre_unbind(dev);
691 list_del(&dev->uclass_node);
696 int uclass_pre_probe_device(struct udevice *dev)
698 struct uclass_driver *uc_drv;
701 uc_drv = dev->uclass->uc_drv;
702 if (uc_drv->pre_probe) {
703 ret = uc_drv->pre_probe(dev);
710 uc_drv = dev->parent->uclass->uc_drv;
711 if (uc_drv->child_pre_probe) {
712 ret = uc_drv->child_pre_probe(dev);
720 int uclass_post_probe_device(struct udevice *dev)
722 struct uclass_driver *uc_drv;
726 uc_drv = dev->parent->uclass->uc_drv;
727 if (uc_drv->child_post_probe) {
728 ret = uc_drv->child_post_probe(dev);
734 uc_drv = dev->uclass->uc_drv;
735 if (uc_drv->post_probe) {
736 ret = uc_drv->post_probe(dev);
744 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
745 int uclass_pre_remove_device(struct udevice *dev)
751 if (uc->uc_drv->pre_remove) {
752 ret = uc->uc_drv->pre_remove(dev);
761 int uclass_probe_all(enum uclass_id id)
766 ret = uclass_first_device(id, &dev);
770 /* Scanning uclass to probe all devices */
772 ret = uclass_next_device(&dev);
780 UCLASS_DRIVER(nop) = {