]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/core/uclass.c
2 * Copyright (c) 2013 Google, Inc
5 * Pavel Herrmann <morpheus.ibis@gmail.com>
7 * SPDX-License-Identifier: GPL-2.0+
14 #include <dm/device.h>
15 #include <dm/device-internal.h>
17 #include <dm/uclass.h>
18 #include <dm/uclass-internal.h>
21 DECLARE_GLOBAL_DATA_PTR
;
23 struct uclass
*uclass_find(enum uclass_id key
)
30 * TODO(sjg@chromium.org): Optimise this, perhaps moving the found
31 * node to the start of the list, or creating a linear array mapping
34 list_for_each_entry(uc
, &gd
->uclass_root
, sibling_node
) {
35 if (uc
->uc_drv
->id
== key
)
43 * uclass_add() - Create new uclass in list
44 * @id: Id number to create
45 * @ucp: Returns pointer to uclass, or NULL on error
46 * @return 0 on success, -ve on error
48 * The new uclass is added to the list. There must be only one uclass for
51 static int uclass_add(enum uclass_id id
, struct uclass
**ucp
)
53 struct uclass_driver
*uc_drv
;
58 uc_drv
= lists_uclass_lookup(id
);
60 debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
63 * Use a strange error to make this case easier to find. When
64 * a uclass is not available it can prevent driver model from
65 * starting up and this failure is otherwise hard to debug.
69 uc
= calloc(1, sizeof(*uc
));
72 if (uc_drv
->priv_auto_alloc_size
) {
73 uc
->priv
= calloc(1, uc_drv
->priv_auto_alloc_size
);
80 INIT_LIST_HEAD(&uc
->sibling_node
);
81 INIT_LIST_HEAD(&uc
->dev_head
);
82 list_add(&uc
->sibling_node
, &DM_UCLASS_ROOT_NON_CONST
);
85 ret
= uc_drv
->init(uc
);
94 if (uc_drv
->priv_auto_alloc_size
) {
98 list_del(&uc
->sibling_node
);
105 int uclass_destroy(struct uclass
*uc
)
107 struct uclass_driver
*uc_drv
;
112 * We cannot use list_for_each_entry_safe() here. If a device in this
113 * uclass has a child device also in this uclass, it will be also be
114 * unbound (by the recursion in the call to device_unbind() below).
115 * We can loop until the list is empty.
117 while (!list_empty(&uc
->dev_head
)) {
118 dev
= list_first_entry(&uc
->dev_head
, struct udevice
,
120 ret
= device_remove(dev
, DM_REMOVE_NORMAL
);
123 ret
= device_unbind(dev
);
131 list_del(&uc
->sibling_node
);
132 if (uc_drv
->priv_auto_alloc_size
)
139 int uclass_get(enum uclass_id id
, struct uclass
**ucp
)
144 uc
= uclass_find(id
);
146 return uclass_add(id
, ucp
);
152 const char *uclass_get_name(enum uclass_id id
)
156 if (uclass_get(id
, &uc
))
158 return uc
->uc_drv
->name
;
161 int uclass_find_device(enum uclass_id id
, int index
, struct udevice
**devp
)
168 ret
= uclass_get(id
, &uc
);
171 if (list_empty(&uc
->dev_head
))
174 list_for_each_entry(dev
, &uc
->dev_head
, uclass_node
) {
184 int uclass_find_first_device(enum uclass_id id
, struct udevice
**devp
)
190 ret
= uclass_get(id
, &uc
);
193 if (list_empty(&uc
->dev_head
))
196 *devp
= list_first_entry(&uc
->dev_head
, struct udevice
, uclass_node
);
201 int uclass_find_next_device(struct udevice
**devp
)
203 struct udevice
*dev
= *devp
;
206 if (list_is_last(&dev
->uclass_node
, &dev
->uclass
->dev_head
))
209 *devp
= list_entry(dev
->uclass_node
.next
, struct udevice
, uclass_node
);
214 int uclass_find_device_by_name(enum uclass_id id
, const char *name
,
215 struct udevice
**devp
)
224 ret
= uclass_get(id
, &uc
);
228 list_for_each_entry(dev
, &uc
->dev_head
, uclass_node
) {
229 if (!strncmp(dev
->name
, name
, strlen(name
))) {
238 int uclass_find_device_by_seq(enum uclass_id id
, int seq_or_req_seq
,
239 bool find_req_seq
, struct udevice
**devp
)
246 debug("%s: %d %d\n", __func__
, find_req_seq
, seq_or_req_seq
);
247 if (seq_or_req_seq
== -1)
249 ret
= uclass_get(id
, &uc
);
253 list_for_each_entry(dev
, &uc
->dev_head
, uclass_node
) {
254 debug(" - %d %d '%s'\n", dev
->req_seq
, dev
->seq
, dev
->name
);
255 if ((find_req_seq
? dev
->req_seq
: dev
->seq
) ==
262 debug(" - not found\n");
267 int uclass_find_device_by_of_offset(enum uclass_id id
, int node
,
268 struct udevice
**devp
)
277 ret
= uclass_get(id
, &uc
);
281 list_for_each_entry(dev
, &uc
->dev_head
, uclass_node
) {
282 if (dev_of_offset(dev
) == node
) {
291 int uclass_find_device_by_ofnode(enum uclass_id id
, ofnode node
,
292 struct udevice
**devp
)
299 if (!ofnode_valid(node
))
301 ret
= uclass_get(id
, &uc
);
305 list_for_each_entry(dev
, &uc
->dev_head
, uclass_node
) {
306 if (ofnode_equal(dev_ofnode(dev
), node
)) {
315 #if CONFIG_IS_ENABLED(OF_CONTROL)
316 static int uclass_find_device_by_phandle(enum uclass_id id
,
317 struct udevice
*parent
,
319 struct udevice
**devp
)
327 find_phandle
= dev_read_u32_default(parent
, name
, -1);
328 if (find_phandle
<= 0)
330 ret
= uclass_get(id
, &uc
);
334 list_for_each_entry(dev
, &uc
->dev_head
, uclass_node
) {
337 phandle
= dev_read_phandle(dev
);
339 if (phandle
== find_phandle
) {
349 int uclass_get_device_by_driver(enum uclass_id id
,
350 const struct driver
*find_drv
,
351 struct udevice
**devp
)
357 ret
= uclass_get(id
, &uc
);
361 list_for_each_entry(dev
, &uc
->dev_head
, uclass_node
) {
362 if (dev
->driver
== find_drv
)
363 return uclass_get_device_tail(dev
, 0, devp
);
369 int uclass_get_device_tail(struct udevice
*dev
, int ret
, struct udevice
**devp
)
375 ret
= device_probe(dev
);
384 int uclass_get_device(enum uclass_id id
, int index
, struct udevice
**devp
)
390 ret
= uclass_find_device(id
, index
, &dev
);
391 return uclass_get_device_tail(dev
, ret
, devp
);
394 int uclass_get_device_by_name(enum uclass_id id
, const char *name
,
395 struct udevice
**devp
)
401 ret
= uclass_find_device_by_name(id
, name
, &dev
);
402 return uclass_get_device_tail(dev
, ret
, devp
);
405 int uclass_get_device_by_seq(enum uclass_id id
, int seq
, struct udevice
**devp
)
411 ret
= uclass_find_device_by_seq(id
, seq
, false, &dev
);
412 if (ret
== -ENODEV
) {
414 * We didn't find it in probed devices. See if there is one
415 * that will request this seq if probed.
417 ret
= uclass_find_device_by_seq(id
, seq
, true, &dev
);
419 return uclass_get_device_tail(dev
, ret
, devp
);
422 int uclass_get_device_by_of_offset(enum uclass_id id
, int node
,
423 struct udevice
**devp
)
429 ret
= uclass_find_device_by_of_offset(id
, node
, &dev
);
430 return uclass_get_device_tail(dev
, ret
, devp
);
433 int uclass_get_device_by_ofnode(enum uclass_id id
, ofnode node
,
434 struct udevice
**devp
)
440 ret
= uclass_find_device_by_ofnode(id
, node
, &dev
);
442 return uclass_get_device_tail(dev
, ret
, devp
);
445 #if CONFIG_IS_ENABLED(OF_CONTROL)
446 int uclass_get_device_by_phandle(enum uclass_id id
, struct udevice
*parent
,
447 const char *name
, struct udevice
**devp
)
453 ret
= uclass_find_device_by_phandle(id
, parent
, name
, &dev
);
454 return uclass_get_device_tail(dev
, ret
, devp
);
458 int uclass_first_device(enum uclass_id id
, struct udevice
**devp
)
464 ret
= uclass_find_first_device(id
, &dev
);
467 return uclass_get_device_tail(dev
, ret
, devp
);
470 int uclass_first_device_err(enum uclass_id id
, struct udevice
**devp
)
474 ret
= uclass_first_device(id
, devp
);
483 int uclass_next_device(struct udevice
**devp
)
485 struct udevice
*dev
= *devp
;
489 ret
= uclass_find_next_device(&dev
);
492 return uclass_get_device_tail(dev
, ret
, devp
);
495 int uclass_first_device_check(enum uclass_id id
, struct udevice
**devp
)
500 ret
= uclass_find_first_device(id
, devp
);
506 return device_probe(*devp
);
509 int uclass_next_device_check(struct udevice
**devp
)
513 ret
= uclass_find_next_device(devp
);
519 return device_probe(*devp
);
522 int uclass_bind_device(struct udevice
*dev
)
528 list_add_tail(&dev
->uclass_node
, &uc
->dev_head
);
531 struct uclass_driver
*uc_drv
= dev
->parent
->uclass
->uc_drv
;
533 if (uc_drv
->child_post_bind
) {
534 ret
= uc_drv
->child_post_bind(dev
);
542 /* There is no need to undo the parent's post_bind call */
543 list_del(&dev
->uclass_node
);
548 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
549 int uclass_unbind_device(struct udevice
*dev
)
555 if (uc
->uc_drv
->pre_unbind
) {
556 ret
= uc
->uc_drv
->pre_unbind(dev
);
561 list_del(&dev
->uclass_node
);
566 int uclass_resolve_seq(struct udevice
*dev
)
572 assert(dev
->seq
== -1);
573 ret
= uclass_find_device_by_seq(dev
->uclass
->uc_drv
->id
, dev
->req_seq
,
576 dm_warn("Device '%s': seq %d is in use by '%s'\n",
577 dev
->name
, dev
->req_seq
, dup
->name
);
578 } else if (ret
== -ENODEV
) {
579 /* Our requested sequence number is available */
580 if (dev
->req_seq
!= -1)
586 for (seq
= 0; seq
< DM_MAX_SEQ
; seq
++) {
587 ret
= uclass_find_device_by_seq(dev
->uclass
->uc_drv
->id
, seq
,
597 int uclass_pre_probe_device(struct udevice
*dev
)
599 struct uclass_driver
*uc_drv
;
602 uc_drv
= dev
->uclass
->uc_drv
;
603 if (uc_drv
->pre_probe
) {
604 ret
= uc_drv
->pre_probe(dev
);
611 uc_drv
= dev
->parent
->uclass
->uc_drv
;
612 if (uc_drv
->child_pre_probe
)
613 return uc_drv
->child_pre_probe(dev
);
618 int uclass_post_probe_device(struct udevice
*dev
)
620 struct uclass_driver
*uc_drv
= dev
->uclass
->uc_drv
;
622 if (uc_drv
->post_probe
)
623 return uc_drv
->post_probe(dev
);
628 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
629 int uclass_pre_remove_device(struct udevice
*dev
)
635 if (uc
->uc_drv
->pre_remove
) {
636 ret
= uc
->uc_drv
->pre_remove(dev
);