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 <dm/device.h>
17 #include <dm/device-internal.h>
19 #include <dm/uclass.h>
20 #include <dm/uclass-internal.h>
23 DECLARE_GLOBAL_DATA_PTR;
25 struct uclass *uclass_find(enum uclass_id key)
32 * TODO(sjg@chromium.org): Optimise this, perhaps moving the found
33 * node to the start of the list, or creating a linear array mapping
36 list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
37 if (uc->uc_drv->id == key)
45 * uclass_add() - Create new uclass in list
46 * @id: Id number to create
47 * @ucp: Returns pointer to uclass, or NULL on error
48 * @return 0 on success, -ve on error
50 * The new uclass is added to the list. There must be only one uclass for
53 static int uclass_add(enum uclass_id id, struct uclass **ucp)
55 struct uclass_driver *uc_drv;
60 uc_drv = lists_uclass_lookup(id);
62 debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
65 * Use a strange error to make this case easier to find. When
66 * a uclass is not available it can prevent driver model from
67 * starting up and this failure is otherwise hard to debug.
71 uc = calloc(1, sizeof(*uc));
74 if (uc_drv->priv_auto) {
75 uc->priv = calloc(1, uc_drv->priv_auto);
82 INIT_LIST_HEAD(&uc->sibling_node);
83 INIT_LIST_HEAD(&uc->dev_head);
84 list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST);
87 ret = uc_drv->init(uc);
96 if (uc_drv->priv_auto) {
100 list_del(&uc->sibling_node);
107 int uclass_destroy(struct uclass *uc)
109 struct uclass_driver *uc_drv;
114 * We cannot use list_for_each_entry_safe() here. If a device in this
115 * uclass has a child device also in this uclass, it will be also be
116 * unbound (by the recursion in the call to device_unbind() below).
117 * We can loop until the list is empty.
119 while (!list_empty(&uc->dev_head)) {
120 dev = list_first_entry(&uc->dev_head, struct udevice,
122 ret = device_remove(dev, DM_REMOVE_NORMAL | DM_REMOVE_NO_PD);
124 return log_msg_ret("remove", ret);
125 ret = device_unbind(dev);
127 return log_msg_ret("unbind", ret);
133 list_del(&uc->sibling_node);
134 if (uc_drv->priv_auto)
141 int uclass_get(enum uclass_id id, struct uclass **ucp)
146 uc = uclass_find(id);
148 return uclass_add(id, ucp);
154 const char *uclass_get_name(enum uclass_id id)
158 if (uclass_get(id, &uc))
160 return uc->uc_drv->name;
163 enum uclass_id uclass_get_by_name(const char *name)
167 for (i = 0; i < UCLASS_COUNT; i++) {
168 struct uclass_driver *uc_drv = lists_uclass_lookup(i);
170 if (uc_drv && !strcmp(uc_drv->name, name))
174 return UCLASS_INVALID;
177 int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp)
179 struct udevice *iter;
180 struct uclass *uc = dev->uclass;
183 if (list_empty(&uc->dev_head))
186 uclass_foreach_dev(iter, uc) {
198 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
205 ret = uclass_get(id, &uc);
208 if (list_empty(&uc->dev_head))
211 uclass_foreach_dev(dev, uc) {
221 int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
227 ret = uclass_get(id, &uc);
230 if (list_empty(&uc->dev_head))
233 *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
238 int uclass_find_next_device(struct udevice **devp)
240 struct udevice *dev = *devp;
243 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
246 *devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
251 int uclass_find_device_by_name(enum uclass_id id, const char *name,
252 struct udevice **devp)
261 ret = uclass_get(id, &uc);
265 uclass_foreach_dev(dev, uc) {
266 if (!strcmp(dev->name, name)) {
275 int uclass_find_next_free_req_seq(struct uclass *uc)
280 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
281 if ((dev->req_seq != -1) && (dev->req_seq > max))
291 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
292 bool find_req_seq, struct udevice **devp)
299 log_debug("%d %d\n", find_req_seq, seq_or_req_seq);
300 if (seq_or_req_seq == -1)
302 ret = uclass_get(id, &uc);
306 uclass_foreach_dev(dev, uc) {
307 log_debug(" - %d %d '%s'\n",
308 dev->req_seq, dev_seq(dev), dev->name);
309 if (dev_seq(dev) == seq_or_req_seq) {
311 log_debug(" - found\n");
315 log_debug(" - not found\n");
320 int uclass_find_device_by_of_offset(enum uclass_id id, int node,
321 struct udevice **devp)
330 ret = uclass_get(id, &uc);
334 uclass_foreach_dev(dev, uc) {
335 if (dev_of_offset(dev) == node) {
344 int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
345 struct udevice **devp)
351 log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
353 if (!ofnode_valid(node))
355 ret = uclass_get(id, &uc);
359 uclass_foreach_dev(dev, uc) {
360 log(LOGC_DM, LOGL_DEBUG_CONTENT, " - checking %s\n",
362 if (ofnode_equal(dev_ofnode(dev), node)) {
370 log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
371 ofnode_get_name(node), *devp ? (*devp)->name : "(none)", ret);
375 #if CONFIG_IS_ENABLED(OF_CONTROL)
376 int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent,
377 const char *name, struct udevice **devp)
385 find_phandle = dev_read_u32_default(parent, name, -1);
386 if (find_phandle <= 0)
388 ret = uclass_get(id, &uc);
392 uclass_foreach_dev(dev, uc) {
395 phandle = dev_read_phandle(dev);
397 if (phandle == find_phandle) {
407 int uclass_get_device_by_driver(enum uclass_id id,
408 const struct driver *find_drv,
409 struct udevice **devp)
415 ret = uclass_get(id, &uc);
419 uclass_foreach_dev(dev, uc) {
420 if (dev->driver == find_drv)
421 return uclass_get_device_tail(dev, 0, devp);
427 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp)
433 ret = device_probe(dev);
442 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
448 ret = uclass_find_device(id, index, &dev);
449 return uclass_get_device_tail(dev, ret, devp);
452 int uclass_get_device_by_name(enum uclass_id id, const char *name,
453 struct udevice **devp)
459 ret = uclass_find_device_by_name(id, name, &dev);
460 return uclass_get_device_tail(dev, ret, devp);
463 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
469 ret = uclass_find_device_by_seq(id, seq, false, &dev);
470 if (ret == -ENODEV) {
472 * We didn't find it in probed devices. See if there is one
473 * that will request this seq if probed.
475 ret = uclass_find_device_by_seq(id, seq, true, &dev);
477 return uclass_get_device_tail(dev, ret, devp);
480 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
481 struct udevice **devp)
487 ret = uclass_find_device_by_of_offset(id, node, &dev);
488 return uclass_get_device_tail(dev, ret, devp);
491 int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
492 struct udevice **devp)
497 log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
499 ret = uclass_find_device_by_ofnode(id, node, &dev);
500 log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
501 ofnode_get_name(node), dev ? dev->name : "(none)", ret);
503 return uclass_get_device_tail(dev, ret, devp);
506 #if CONFIG_IS_ENABLED(OF_CONTROL)
507 int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
508 struct udevice **devp)
515 ret = uclass_get(id, &uc);
519 uclass_foreach_dev(dev, uc) {
522 phandle = dev_read_phandle(dev);
524 if (phandle == phandle_id) {
526 return uclass_get_device_tail(dev, ret, devp);
533 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
534 const char *name, struct udevice **devp)
540 ret = uclass_find_device_by_phandle(id, parent, name, &dev);
541 return uclass_get_device_tail(dev, ret, devp);
545 int uclass_first_device(enum uclass_id id, struct udevice **devp)
551 ret = uclass_find_first_device(id, &dev);
554 return uclass_get_device_tail(dev, ret, devp);
557 int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
561 ret = uclass_first_device(id, devp);
570 int uclass_next_device(struct udevice **devp)
572 struct udevice *dev = *devp;
576 ret = uclass_find_next_device(&dev);
579 return uclass_get_device_tail(dev, ret, devp);
582 int uclass_next_device_err(struct udevice **devp)
586 ret = uclass_next_device(devp);
595 int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
600 ret = uclass_find_first_device(id, devp);
606 return device_probe(*devp);
609 int uclass_next_device_check(struct udevice **devp)
613 ret = uclass_find_next_device(devp);
619 return device_probe(*devp);
622 int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data,
623 struct udevice **devp)
628 uclass_id_foreach_dev(id, dev, uc) {
629 if (dev_get_driver_data(dev) == driver_data) {
632 return device_probe(dev);
639 int uclass_bind_device(struct udevice *dev)
645 list_add_tail(&dev->uclass_node, &uc->dev_head);
648 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
650 if (uc_drv->child_post_bind) {
651 ret = uc_drv->child_post_bind(dev);
659 /* There is no need to undo the parent's post_bind call */
660 list_del(&dev->uclass_node);
665 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
666 int uclass_unbind_device(struct udevice *dev)
672 if (uc->uc_drv->pre_unbind) {
673 ret = uc->uc_drv->pre_unbind(dev);
678 list_del(&dev->uclass_node);
683 int uclass_resolve_seq(struct udevice *dev)
685 struct uclass *uc = dev->uclass;
686 struct uclass_driver *uc_drv = uc->uc_drv;
691 assert(dev_seq(dev) == -1);
692 ret = uclass_find_device_by_seq(uc_drv->id, dev->req_seq, false, &dup);
694 /* Do nothing here for now */
695 } else if (ret == -ENODEV) {
696 /* Our requested sequence number is available */
697 if (dev->req_seq != -1)
703 if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
704 (uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS)) {
706 * dev_read_alias_highest_id() will return -1 if there no
707 * alias. Thus we can always add one.
709 seq = dev_read_alias_highest_id(uc_drv->name) + 1;
712 for (; seq < DM_MAX_SEQ; seq++) {
713 ret = uclass_find_device_by_seq(uc_drv->id, seq, false, &dup);
722 int uclass_pre_probe_device(struct udevice *dev)
724 struct uclass_driver *uc_drv;
727 uc_drv = dev->uclass->uc_drv;
728 if (uc_drv->pre_probe) {
729 ret = uc_drv->pre_probe(dev);
736 uc_drv = dev->parent->uclass->uc_drv;
737 if (uc_drv->child_pre_probe) {
738 ret = uc_drv->child_pre_probe(dev);
746 int uclass_post_probe_device(struct udevice *dev)
748 struct uclass_driver *uc_drv;
752 uc_drv = dev->parent->uclass->uc_drv;
753 if (uc_drv->child_post_probe) {
754 ret = uc_drv->child_post_probe(dev);
760 uc_drv = dev->uclass->uc_drv;
761 if (uc_drv->post_probe) {
762 ret = uc_drv->post_probe(dev);
770 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
771 int uclass_pre_remove_device(struct udevice *dev)
777 if (uc->uc_drv->pre_remove) {
778 ret = uc->uc_drv->pre_remove(dev);
787 UCLASS_DRIVER(nop) = {