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;
102 struct udevice *dev, *tmp;
105 list_for_each_entry_safe(dev, tmp, &uc->dev_head, uclass_node) {
106 ret = device_remove(dev);
109 ret = device_unbind(dev);
117 list_del(&uc->sibling_node);
118 if (uc_drv->priv_auto_alloc_size)
125 int uclass_get(enum uclass_id id, struct uclass **ucp)
130 uc = uclass_find(id);
132 return uclass_add(id, ucp);
138 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
145 ret = uclass_get(id, &uc);
149 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
159 int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
165 ret = uclass_get(id, &uc);
168 if (list_empty(&uc->dev_head))
171 *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
176 int uclass_find_next_device(struct udevice **devp)
178 struct udevice *dev = *devp;
181 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
184 *devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
189 int uclass_find_device_by_name(enum uclass_id id, const char *name,
190 struct udevice **devp)
199 ret = uclass_get(id, &uc);
203 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
204 if (!strncmp(dev->name, name, strlen(name))) {
213 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
214 bool find_req_seq, struct udevice **devp)
221 debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq);
222 if (seq_or_req_seq == -1)
224 ret = uclass_get(id, &uc);
228 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
229 debug(" - %d %d\n", dev->req_seq, dev->seq);
230 if ((find_req_seq ? dev->req_seq : dev->seq) ==
237 debug(" - not found\n");
242 static int uclass_find_device_by_of_offset(enum uclass_id id, int node,
243 struct udevice **devp)
252 ret = uclass_get(id, &uc);
256 list_for_each_entry(dev, &uc->dev_head, uclass_node) {
257 if (dev->of_offset == node) {
267 * uclass_get_device_tail() - handle the end of a get_device call
269 * This handles returning an error or probing a device as needed.
271 * @dev: Device that needs to be probed
272 * @ret: Error to return. If non-zero then the device is not probed
273 * @devp: Returns the value of 'dev' if there is no error
274 * @return ret, if non-zero, else the result of the device_probe() call
276 static int uclass_get_device_tail(struct udevice *dev, int ret,
277 struct udevice **devp)
282 ret = device_probe(dev);
291 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
297 ret = uclass_find_device(id, index, &dev);
298 return uclass_get_device_tail(dev, ret, devp);
301 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
307 ret = uclass_find_device_by_seq(id, seq, false, &dev);
308 if (ret == -ENODEV) {
310 * We didn't find it in probed devices. See if there is one
311 * that will request this seq if probed.
313 ret = uclass_find_device_by_seq(id, seq, true, &dev);
315 return uclass_get_device_tail(dev, ret, devp);
318 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
319 struct udevice **devp)
325 ret = uclass_find_device_by_of_offset(id, node, &dev);
326 return uclass_get_device_tail(dev, ret, devp);
329 int uclass_first_device(enum uclass_id id, struct udevice **devp)
335 ret = uclass_find_first_device(id, &dev);
336 return uclass_get_device_tail(dev, ret, devp);
339 int uclass_next_device(struct udevice **devp)
341 struct udevice *dev = *devp;
345 ret = uclass_find_next_device(&dev);
346 return uclass_get_device_tail(dev, ret, devp);
349 int uclass_bind_device(struct udevice *dev)
355 list_add_tail(&dev->uclass_node, &uc->dev_head);
358 struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
360 if (uc_drv->child_post_bind) {
361 ret = uc_drv->child_post_bind(dev);
366 if (uc->uc_drv->post_bind) {
367 ret = uc->uc_drv->post_bind(dev);
374 /* There is no need to undo the parent's post_bind call */
375 list_del(&dev->uclass_node);
380 int uclass_unbind_device(struct udevice *dev)
386 if (uc->uc_drv->pre_unbind) {
387 ret = uc->uc_drv->pre_unbind(dev);
392 list_del(&dev->uclass_node);
396 int uclass_resolve_seq(struct udevice *dev)
402 assert(dev->seq == -1);
403 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
406 dm_warn("Device '%s': seq %d is in use by '%s'\n",
407 dev->name, dev->req_seq, dup->name);
408 } else if (ret == -ENODEV) {
409 /* Our requested sequence number is available */
410 if (dev->req_seq != -1)
416 for (seq = 0; seq < DM_MAX_SEQ; seq++) {
417 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
427 int uclass_pre_probe_device(struct udevice *dev)
429 struct uclass_driver *uc_drv;
432 uc_drv = dev->uclass->uc_drv;
433 if (uc_drv->pre_probe) {
434 ret = uc_drv->pre_probe(dev);
441 uc_drv = dev->parent->uclass->uc_drv;
442 if (uc_drv->child_pre_probe)
443 return uc_drv->child_pre_probe(dev);
448 int uclass_post_probe_device(struct udevice *dev)
450 struct uclass_driver *uc_drv = dev->uclass->uc_drv;
452 if (uc_drv->post_probe)
453 return uc_drv->post_probe(dev);
458 int uclass_pre_remove_device(struct udevice *dev)
460 struct uclass_driver *uc_drv;
466 if (uc->uc_drv->pre_remove) {
467 ret = uc->uc_drv->pre_remove(dev);
471 if (uc_drv->per_device_auto_alloc_size) {
472 free(dev->uclass_priv);
473 dev->uclass_priv = NULL;