2 * Copyright (c) 2013 Google, Inc
5 * Pavel Herrmann <morpheus.ibis@gmail.com>
7 * SPDX-License-Identifier: GPL-2.0+
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 dm_warn("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
63 uc = calloc(1, sizeof(*uc));
66 if (uc_drv->priv_auto_alloc_size) {
67 uc->priv = calloc(1, uc_drv->priv_auto_alloc_size);
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);
79 ret = uc_drv->init(uc);
88 if (uc_drv->priv_auto_alloc_size) {
92 list_del(&uc->sibling_node);
99 int uclass_destroy(struct uclass *uc)
101 struct uclass_driver *uc_drv;
106 * We cannot use list_for_each_entry_safe() here. If a device in this
107 * uclass has a child device also in this uclass, it will be also be
108 * unbound (by the recursion in the call to device_unbind() below).
109 * We can loop until the list is empty.
111 while (!list_empty(&uc->dev_head)) {
112 dev = list_first_entry(&uc->dev_head, struct udevice,
114 ret = device_remove(dev);
117 ret = device_unbind(dev);
125 list_del(&uc->sibling_node);
126 if (uc_drv->priv_auto_alloc_size)
133 int uclass_get(enum uclass_id id, struct uclass **ucp)
138 uc = uclass_find(id);
140 return uclass_add(id, ucp);
146 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
153 ret = uclass_get(id, &uc);
157 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
167 int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
173 ret = uclass_get(id, &uc);
176 if (list_empty(&uc->dev_head))
179 *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
184 int uclass_find_next_device(struct udevice **devp)
186 struct udevice *dev = *devp;
189 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
192 *devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
197 int uclass_find_device_by_name(enum uclass_id id, const char *name,
198 struct udevice **devp)
207 ret = uclass_get(id, &uc);
211 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
212 if (!strncmp(dev->name, name, strlen(name))) {
221 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
222 bool find_req_seq, struct udevice **devp)
229 debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq);
230 if (seq_or_req_seq == -1)
232 ret = uclass_get(id, &uc);
236 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
237 debug(" - %d %d\n", dev->req_seq, dev->seq);
238 if ((find_req_seq ? dev->req_seq : dev->seq) ==
245 debug(" - not found\n");
250 static int uclass_find_device_by_of_offset(enum uclass_id id, int node,
251 struct udevice **devp)
260 ret = uclass_get(id, &uc);
264 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
265 if (dev->of_offset == node) {
274 int uclass_get_device_tail(struct udevice *dev, int ret,
275 struct udevice **devp)
280 ret = device_probe(dev);
289 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
295 ret = uclass_find_device(id, index, &dev);
296 return uclass_get_device_tail(dev, ret, devp);
299 int uclass_get_device_by_name(enum uclass_id id, const char *name,
300 struct udevice **devp)
306 ret = uclass_find_device_by_name(id, name, &dev);
307 return uclass_get_device_tail(dev, ret, devp);
310 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
316 ret = uclass_find_device_by_seq(id, seq, false, &dev);
317 if (ret == -ENODEV) {
319 * We didn't find it in probed devices. See if there is one
320 * that will request this seq if probed.
322 ret = uclass_find_device_by_seq(id, seq, true, &dev);
324 return uclass_get_device_tail(dev, ret, devp);
327 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
328 struct udevice **devp)
334 ret = uclass_find_device_by_of_offset(id, node, &dev);
335 return uclass_get_device_tail(dev, ret, devp);
338 int uclass_first_device(enum uclass_id id, struct udevice **devp)
344 ret = uclass_find_first_device(id, &dev);
345 return uclass_get_device_tail(dev, ret, devp);
348 int uclass_next_device(struct udevice **devp)
350 struct udevice *dev = *devp;
354 ret = uclass_find_next_device(&dev);
355 return uclass_get_device_tail(dev, ret, devp);
358 int uclass_bind_device(struct udevice *dev)
364 list_add_tail(&dev->uclass_node, &uc->dev_head);
367 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
369 if (uc_drv->child_post_bind) {
370 ret = uc_drv->child_post_bind(dev);
375 if (uc->uc_drv->post_bind) {
376 ret = uc->uc_drv->post_bind(dev);
383 /* There is no need to undo the parent's post_bind call */
384 list_del(&dev->uclass_node);
389 #ifdef CONFIG_DM_DEVICE_REMOVE
390 int uclass_unbind_device(struct udevice *dev)
396 if (uc->uc_drv->pre_unbind) {
397 ret = uc->uc_drv->pre_unbind(dev);
402 list_del(&dev->uclass_node);
407 int uclass_resolve_seq(struct udevice *dev)
413 assert(dev->seq == -1);
414 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
417 dm_warn("Device '%s': seq %d is in use by '%s'\n",
418 dev->name, dev->req_seq, dup->name);
419 } else if (ret == -ENODEV) {
420 /* Our requested sequence number is available */
421 if (dev->req_seq != -1)
427 for (seq = 0; seq < DM_MAX_SEQ; seq++) {
428 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
438 int uclass_pre_probe_device(struct udevice *dev)
440 struct uclass_driver *uc_drv;
443 uc_drv = dev->uclass->uc_drv;
444 if (uc_drv->pre_probe) {
445 ret = uc_drv->pre_probe(dev);
452 uc_drv = dev->parent->uclass->uc_drv;
453 if (uc_drv->child_pre_probe)
454 return uc_drv->child_pre_probe(dev);
459 int uclass_post_probe_device(struct udevice *dev)
461 struct uclass_driver *uc_drv = dev->uclass->uc_drv;
463 if (uc_drv->post_probe)
464 return uc_drv->post_probe(dev);
469 #ifdef CONFIG_DM_DEVICE_REMOVE
470 int uclass_pre_remove_device(struct udevice *dev)
472 struct uclass_driver *uc_drv;
478 if (uc->uc_drv->pre_remove) {
479 ret = uc->uc_drv->pre_remove(dev);
483 if (uc_drv->per_device_auto_alloc_size) {
484 free(dev->uclass_priv);
485 dev->uclass_priv = NULL;