4 * Copyright (c) 2013 Google, Inc
7 * Pavel Herrmann <morpheus.ibis@gmail.com>
9 * SPDX-License-Identifier: GPL-2.0+
15 #include <dm/device.h>
16 #include <dm/device-internal.h>
18 #include <dm/platdata.h>
19 #include <dm/uclass.h>
20 #include <dm/uclass-internal.h>
22 #include <linux/err.h>
23 #include <linux/list.h>
25 DECLARE_GLOBAL_DATA_PTR;
27 int device_bind(struct udevice *parent, const struct driver *drv,
28 const char *name, void *platdata, int of_offset,
29 struct udevice **devp)
39 ret = uclass_get(drv->id, &uc);
43 dev = calloc(1, sizeof(struct udevice));
47 INIT_LIST_HEAD(&dev->sibling_node);
48 INIT_LIST_HEAD(&dev->child_head);
49 INIT_LIST_HEAD(&dev->uclass_node);
50 INIT_LIST_HEAD(&dev->devres_head);
51 dev->platdata = platdata;
53 dev->of_offset = of_offset;
60 if (IS_ENABLED(CONFIG_OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
62 * Some devices, such as a SPI bus, I2C bus and serial ports
63 * are numbered using aliases.
65 * This is just a 'requested' sequence, and will be
66 * resolved (and ->seq updated) when the device is probed.
68 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
69 if (uc->uc_drv->name && of_offset != -1) {
70 fdtdec_get_alias_seq(gd->fdt_blob,
71 uc->uc_drv->name, of_offset,
77 if (!dev->platdata && drv->platdata_auto_alloc_size) {
78 dev->flags |= DM_FLAG_ALLOC_PDATA;
79 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
86 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
88 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
89 dev->uclass_platdata = calloc(1, size);
90 if (!dev->uclass_platdata) {
97 size = parent->driver->per_child_platdata_auto_alloc_size;
99 size = parent->uclass->uc_drv->
100 per_child_platdata_auto_alloc_size;
103 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
104 dev->parent_platdata = calloc(1, size);
105 if (!dev->parent_platdata) {
112 /* put dev into parent's successor list */
114 list_add_tail(&dev->sibling_node, &parent->child_head);
116 ret = uclass_bind_device(dev);
118 goto fail_uclass_bind;
120 /* if we fail to bind we remove device from successors and free it */
122 ret = drv->bind(dev);
126 if (parent && parent->driver->child_post_bind) {
127 ret = parent->driver->child_post_bind(dev);
129 goto fail_child_post_bind;
133 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
136 dev->flags |= DM_FLAG_BOUND;
140 fail_child_post_bind:
141 if (IS_ENABLED(CONFIG_DM_DEVICE_REMOVE)) {
142 if (drv->unbind && drv->unbind(dev)) {
143 dm_warn("unbind() method failed on dev '%s' on error path\n",
149 if (IS_ENABLED(CONFIG_DM_DEVICE_REMOVE)) {
150 if (uclass_unbind_device(dev)) {
151 dm_warn("Failed to unbind dev '%s' on error path\n",
156 if (IS_ENABLED(CONFIG_DM_DEVICE_REMOVE)) {
157 list_del(&dev->sibling_node);
158 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
159 free(dev->parent_platdata);
160 dev->parent_platdata = NULL;
164 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
165 free(dev->uclass_platdata);
166 dev->uclass_platdata = NULL;
169 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
171 dev->platdata = NULL;
174 devres_release_all(dev);
181 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
182 const struct driver_info *info, struct udevice **devp)
186 drv = lists_driver_lookup_name(info->name);
189 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
192 return device_bind(parent, drv, info->name, (void *)info->platdata,
196 static void *alloc_priv(int size, uint flags)
200 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
201 priv = memalign(ARCH_DMA_MINALIGN, size);
203 memset(priv, '\0', size);
205 priv = calloc(1, size);
211 int device_probe_child(struct udevice *dev, void *parent_priv)
213 const struct driver *drv;
221 if (dev->flags & DM_FLAG_ACTIVATED)
227 /* Allocate private data if requested */
228 if (drv->priv_auto_alloc_size) {
229 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
235 /* Allocate private data if requested */
236 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
238 dev->uclass_priv = calloc(1, size);
239 if (!dev->uclass_priv) {
245 /* Ensure all parents are probed */
247 size = dev->parent->driver->per_child_auto_alloc_size;
249 size = dev->parent->uclass->uc_drv->
250 per_child_auto_alloc_size;
253 dev->parent_priv = alloc_priv(size, drv->flags);
254 if (!dev->parent_priv) {
259 memcpy(dev->parent_priv, parent_priv, size);
262 ret = device_probe(dev->parent);
267 seq = uclass_resolve_seq(dev);
274 dev->flags |= DM_FLAG_ACTIVATED;
276 ret = uclass_pre_probe_device(dev);
280 if (dev->parent && dev->parent->driver->child_pre_probe) {
281 ret = dev->parent->driver->child_pre_probe(dev);
286 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
287 ret = drv->ofdata_to_platdata(dev);
293 ret = drv->probe(dev);
295 dev->flags &= ~DM_FLAG_ACTIVATED;
300 ret = uclass_post_probe_device(dev);
306 if (device_remove(dev)) {
307 dm_warn("%s: Device '%s' failed to remove on error path\n",
308 __func__, dev->name);
311 dev->flags &= ~DM_FLAG_ACTIVATED;
319 int device_probe(struct udevice *dev)
321 return device_probe_child(dev, NULL);
324 void *dev_get_platdata(struct udevice *dev)
327 dm_warn("%s: null device\n", __func__);
331 return dev->platdata;
334 void *dev_get_parent_platdata(struct udevice *dev)
337 dm_warn("%s: null device\n", __func__);
341 return dev->parent_platdata;
344 void *dev_get_uclass_platdata(struct udevice *dev)
347 dm_warn("%s: null device\n", __func__);
351 return dev->uclass_platdata;
354 void *dev_get_priv(struct udevice *dev)
357 dm_warn("%s: null device\n", __func__);
364 void *dev_get_uclass_priv(struct udevice *dev)
367 dm_warn("%s: null device\n", __func__);
371 return dev->uclass_priv;
374 void *dev_get_parentdata(struct udevice *dev)
377 dm_warn("%s: null device\n", __func__);
381 return dev->parent_priv;
384 static int device_get_device_tail(struct udevice *dev, int ret,
385 struct udevice **devp)
390 ret = device_probe(dev);
399 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
403 list_for_each_entry(dev, &parent->child_head, sibling_node) {
405 return device_get_device_tail(dev, 0, devp);
411 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
412 bool find_req_seq, struct udevice **devp)
417 if (seq_or_req_seq == -1)
420 list_for_each_entry(dev, &parent->child_head, sibling_node) {
421 if ((find_req_seq ? dev->req_seq : dev->seq) ==
431 int device_get_child_by_seq(struct udevice *parent, int seq,
432 struct udevice **devp)
438 ret = device_find_child_by_seq(parent, seq, false, &dev);
439 if (ret == -ENODEV) {
441 * We didn't find it in probed devices. See if there is one
442 * that will request this seq if probed.
444 ret = device_find_child_by_seq(parent, seq, true, &dev);
446 return device_get_device_tail(dev, ret, devp);
449 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
450 struct udevice **devp)
456 list_for_each_entry(dev, &parent->child_head, sibling_node) {
457 if (dev->of_offset == of_offset) {
466 int device_get_child_by_of_offset(struct udevice *parent, int node,
467 struct udevice **devp)
473 ret = device_find_child_by_of_offset(parent, node, &dev);
474 return device_get_device_tail(dev, ret, devp);
477 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
480 struct udevice *dev, *found;
482 if (parent->of_offset == of_offset)
485 list_for_each_entry(dev, &parent->child_head, sibling_node) {
486 found = _device_find_global_by_of_offset(dev, of_offset);
494 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
498 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
499 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
502 int device_find_first_child(struct udevice *parent, struct udevice **devp)
504 if (list_empty(&parent->child_head)) {
507 *devp = list_first_entry(&parent->child_head, struct udevice,
514 int device_find_next_child(struct udevice **devp)
516 struct udevice *dev = *devp;
517 struct udevice *parent = dev->parent;
519 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
522 *devp = list_entry(dev->sibling_node.next, struct udevice,
529 struct udevice *dev_get_parent(struct udevice *child)
531 return child->parent;
534 ulong dev_get_driver_data(struct udevice *dev)
536 return dev->driver_data;
539 const void *dev_get_driver_ops(struct udevice *dev)
541 if (!dev || !dev->driver->ops)
544 return dev->driver->ops;
547 enum uclass_id device_get_uclass_id(struct udevice *dev)
549 return dev->uclass->uc_drv->id;
552 const char *dev_get_uclass_name(struct udevice *dev)
557 return dev->uclass->uc_drv->name;
560 fdt_addr_t dev_get_addr(struct udevice *dev)
562 #ifdef CONFIG_OF_CONTROL
565 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
566 if (addr != FDT_ADDR_T_NONE) {
567 if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS)
568 addr = simple_bus_translate(dev->parent, addr);
573 return FDT_ADDR_T_NONE;
577 bool device_has_children(struct udevice *dev)
579 return !list_empty(&dev->child_head);
582 bool device_has_active_children(struct udevice *dev)
584 struct udevice *child;
586 for (device_find_first_child(dev, &child);
588 device_find_next_child(&child)) {
589 if (device_active(child))
596 bool device_is_last_sibling(struct udevice *dev)
598 struct udevice *parent = dev->parent;
602 return list_is_last(&dev->sibling_node, &parent->child_head);