1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
13 #include <dm/device.h>
14 #include <dm/device-internal.h>
16 #include <dm/uclass.h>
17 #include <dm/uclass-internal.h>
20 DECLARE_GLOBAL_DATA_PTR;
22 struct uclass *uclass_find(enum uclass_id key)
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
33 list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
34 if (uc->uc_drv->id == key)
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
47 * The new uclass is added to the list. There must be only one uclass for
50 static int uclass_add(enum uclass_id id, struct uclass **ucp)
52 struct uclass_driver *uc_drv;
57 uc_drv = lists_uclass_lookup(id);
59 debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
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.
68 uc = calloc(1, sizeof(*uc));
71 if (uc_drv->priv_auto_alloc_size) {
72 uc->priv = calloc(1, uc_drv->priv_auto_alloc_size);
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);
84 ret = uc_drv->init(uc);
93 if (uc_drv->priv_auto_alloc_size) {
97 list_del(&uc->sibling_node);
104 int uclass_destroy(struct uclass *uc)
106 struct uclass_driver *uc_drv;
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.
116 while (!list_empty(&uc->dev_head)) {
117 dev = list_first_entry(&uc->dev_head, struct udevice,
119 ret = device_remove(dev, DM_REMOVE_NORMAL);
122 ret = device_unbind(dev);
130 list_del(&uc->sibling_node);
131 if (uc_drv->priv_auto_alloc_size)
138 int uclass_get(enum uclass_id id, struct uclass **ucp)
143 uc = uclass_find(id);
145 return uclass_add(id, ucp);
151 const char *uclass_get_name(enum uclass_id id)
155 if (uclass_get(id, &uc))
157 return uc->uc_drv->name;
160 enum uclass_id uclass_get_by_name(const char *name)
164 for (i = 0; i < UCLASS_COUNT; i++) {
165 struct uclass_driver *uc_drv = lists_uclass_lookup(i);
167 if (uc_drv && !strcmp(uc_drv->name, name))
171 return UCLASS_INVALID;
174 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
181 ret = uclass_get(id, &uc);
184 if (list_empty(&uc->dev_head))
187 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
197 int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
203 ret = uclass_get(id, &uc);
206 if (list_empty(&uc->dev_head))
209 *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
214 int uclass_find_next_device(struct udevice **devp)
216 struct udevice *dev = *devp;
219 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
222 *devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
227 int uclass_find_device_by_name(enum uclass_id id, const char *name,
228 struct udevice **devp)
237 ret = uclass_get(id, &uc);
241 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
242 if (!strncmp(dev->name, name, strlen(name))) {
251 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
252 bool find_req_seq, struct udevice **devp)
259 debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq);
260 if (seq_or_req_seq == -1)
262 ret = uclass_get(id, &uc);
266 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
267 debug(" - %d %d '%s'\n", dev->req_seq, dev->seq, dev->name);
268 if ((find_req_seq ? dev->req_seq : dev->seq) ==
275 debug(" - not found\n");
280 int uclass_find_device_by_of_offset(enum uclass_id id, int node,
281 struct udevice **devp)
290 ret = uclass_get(id, &uc);
294 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
295 if (dev_of_offset(dev) == node) {
304 int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
305 struct udevice **devp)
312 if (!ofnode_valid(node))
314 ret = uclass_get(id, &uc);
318 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
319 if (ofnode_equal(dev_ofnode(dev), node)) {
328 #if CONFIG_IS_ENABLED(OF_CONTROL)
329 static int uclass_find_device_by_phandle(enum uclass_id id,
330 struct udevice *parent,
332 struct udevice **devp)
340 find_phandle = dev_read_u32_default(parent, name, -1);
341 if (find_phandle <= 0)
343 ret = uclass_get(id, &uc);
347 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
350 phandle = dev_read_phandle(dev);
352 if (phandle == find_phandle) {
362 int uclass_get_device_by_driver(enum uclass_id id,
363 const struct driver *find_drv,
364 struct udevice **devp)
370 ret = uclass_get(id, &uc);
374 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
375 if (dev->driver == find_drv)
376 return uclass_get_device_tail(dev, 0, devp);
382 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp)
388 ret = device_probe(dev);
397 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
403 ret = uclass_find_device(id, index, &dev);
404 return uclass_get_device_tail(dev, ret, devp);
407 int uclass_get_device_by_name(enum uclass_id id, const char *name,
408 struct udevice **devp)
414 ret = uclass_find_device_by_name(id, name, &dev);
415 return uclass_get_device_tail(dev, ret, devp);
418 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
424 ret = uclass_find_device_by_seq(id, seq, false, &dev);
425 if (ret == -ENODEV) {
427 * We didn't find it in probed devices. See if there is one
428 * that will request this seq if probed.
430 ret = uclass_find_device_by_seq(id, seq, true, &dev);
432 return uclass_get_device_tail(dev, ret, devp);
435 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
436 struct udevice **devp)
442 ret = uclass_find_device_by_of_offset(id, node, &dev);
443 return uclass_get_device_tail(dev, ret, devp);
446 int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
447 struct udevice **devp)
453 ret = uclass_find_device_by_ofnode(id, node, &dev);
455 return uclass_get_device_tail(dev, ret, devp);
458 #if CONFIG_IS_ENABLED(OF_CONTROL)
459 int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
460 struct udevice **devp)
467 ret = uclass_get(id, &uc);
471 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
474 phandle = dev_read_phandle(dev);
476 if (phandle == phandle_id) {
478 return uclass_get_device_tail(dev, ret, devp);
485 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
486 const char *name, struct udevice **devp)
492 ret = uclass_find_device_by_phandle(id, parent, name, &dev);
493 return uclass_get_device_tail(dev, ret, devp);
497 int uclass_first_device(enum uclass_id id, struct udevice **devp)
503 ret = uclass_find_first_device(id, &dev);
506 return uclass_get_device_tail(dev, ret, devp);
509 int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
513 ret = uclass_first_device(id, devp);
522 int uclass_next_device(struct udevice **devp)
524 struct udevice *dev = *devp;
528 ret = uclass_find_next_device(&dev);
531 return uclass_get_device_tail(dev, ret, devp);
534 int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
539 ret = uclass_find_first_device(id, devp);
545 return device_probe(*devp);
548 int uclass_next_device_check(struct udevice **devp)
552 ret = uclass_find_next_device(devp);
558 return device_probe(*devp);
561 int uclass_bind_device(struct udevice *dev)
567 list_add_tail(&dev->uclass_node, &uc->dev_head);
570 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
572 if (uc_drv->child_post_bind) {
573 ret = uc_drv->child_post_bind(dev);
581 /* There is no need to undo the parent's post_bind call */
582 list_del(&dev->uclass_node);
587 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
588 int uclass_unbind_device(struct udevice *dev)
594 if (uc->uc_drv->pre_unbind) {
595 ret = uc->uc_drv->pre_unbind(dev);
600 list_del(&dev->uclass_node);
605 int uclass_resolve_seq(struct udevice *dev)
611 assert(dev->seq == -1);
612 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
615 dm_warn("Device '%s': seq %d is in use by '%s'\n",
616 dev->name, dev->req_seq, dup->name);
617 } else if (ret == -ENODEV) {
618 /* Our requested sequence number is available */
619 if (dev->req_seq != -1)
625 for (seq = 0; seq < DM_MAX_SEQ; seq++) {
626 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
636 int uclass_pre_probe_device(struct udevice *dev)
638 struct uclass_driver *uc_drv;
641 uc_drv = dev->uclass->uc_drv;
642 if (uc_drv->pre_probe) {
643 ret = uc_drv->pre_probe(dev);
650 uc_drv = dev->parent->uclass->uc_drv;
651 if (uc_drv->child_pre_probe)
652 return uc_drv->child_pre_probe(dev);
657 int uclass_post_probe_device(struct udevice *dev)
659 struct uclass_driver *uc_drv = dev->uclass->uc_drv;
661 if (uc_drv->post_probe)
662 return uc_drv->post_probe(dev);
667 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
668 int uclass_pre_remove_device(struct udevice *dev)
674 if (uc->uc_drv->pre_remove) {
675 ret = uc->uc_drv->pre_remove(dev);