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)
281 ret = device_probe(dev);
290 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
296 ret = uclass_find_device(id, index, &dev);
297 return uclass_get_device_tail(dev, ret, devp);
300 int uclass_get_device_by_name(enum uclass_id id, const char *name,
301 struct udevice **devp)
307 ret = uclass_find_device_by_name(id, name, &dev);
308 return uclass_get_device_tail(dev, ret, devp);
311 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
317 ret = uclass_find_device_by_seq(id, seq, false, &dev);
318 if (ret == -ENODEV) {
320 * We didn't find it in probed devices. See if there is one
321 * that will request this seq if probed.
323 ret = uclass_find_device_by_seq(id, seq, true, &dev);
325 return uclass_get_device_tail(dev, ret, devp);
328 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
329 struct udevice **devp)
335 ret = uclass_find_device_by_of_offset(id, node, &dev);
336 return uclass_get_device_tail(dev, ret, devp);
339 int uclass_first_device(enum uclass_id id, struct udevice **devp)
345 ret = uclass_find_first_device(id, &dev);
348 return uclass_get_device_tail(dev, ret, devp);
351 int uclass_next_device(struct udevice **devp)
353 struct udevice *dev = *devp;
357 ret = uclass_find_next_device(&dev);
360 return uclass_get_device_tail(dev, ret, devp);
363 int uclass_bind_device(struct udevice *dev)
369 list_add_tail(&dev->uclass_node, &uc->dev_head);
372 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
374 if (uc_drv->child_post_bind) {
375 ret = uc_drv->child_post_bind(dev);
380 if (uc->uc_drv->post_bind) {
381 ret = uc->uc_drv->post_bind(dev);
388 /* There is no need to undo the parent's post_bind call */
389 list_del(&dev->uclass_node);
394 #ifdef CONFIG_DM_DEVICE_REMOVE
395 int uclass_unbind_device(struct udevice *dev)
401 if (uc->uc_drv->pre_unbind) {
402 ret = uc->uc_drv->pre_unbind(dev);
407 list_del(&dev->uclass_node);
412 int uclass_resolve_seq(struct udevice *dev)
418 assert(dev->seq == -1);
419 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
422 dm_warn("Device '%s': seq %d is in use by '%s'\n",
423 dev->name, dev->req_seq, dup->name);
424 } else if (ret == -ENODEV) {
425 /* Our requested sequence number is available */
426 if (dev->req_seq != -1)
432 for (seq = 0; seq < DM_MAX_SEQ; seq++) {
433 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
443 int uclass_pre_probe_device(struct udevice *dev)
445 struct uclass_driver *uc_drv;
448 uc_drv = dev->uclass->uc_drv;
449 if (uc_drv->pre_probe) {
450 ret = uc_drv->pre_probe(dev);
457 uc_drv = dev->parent->uclass->uc_drv;
458 if (uc_drv->child_pre_probe)
459 return uc_drv->child_pre_probe(dev);
464 int uclass_post_probe_device(struct udevice *dev)
466 struct uclass_driver *uc_drv = dev->uclass->uc_drv;
468 if (uc_drv->post_probe)
469 return uc_drv->post_probe(dev);
474 #ifdef CONFIG_DM_DEVICE_REMOVE
475 int uclass_pre_remove_device(struct udevice *dev)
477 struct uclass_driver *uc_drv;
483 if (uc->uc_drv->pre_remove) {
484 ret = uc->uc_drv->pre_remove(dev);
488 if (uc_drv->per_device_auto_alloc_size) {
489 free(dev->uclass_priv);
490 dev->uclass_priv = NULL;