4 * Copyright (c) 2013 Google, Inc
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 dev->platdata = platdata;
52 dev->of_offset = of_offset;
59 #ifdef CONFIG_OF_CONTROL
61 * Some devices, such as a SPI bus, I2C bus and serial ports are
62 * numbered using aliases.
64 * This is just a 'requested' sequence, and will be
65 * resolved (and ->seq updated) when the device is probed.
67 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
68 if (uc->uc_drv->name && of_offset != -1) {
69 fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name,
70 of_offset, &dev->req_seq);
74 if (!dev->platdata && drv->platdata_auto_alloc_size) {
75 dev->flags |= DM_FLAG_ALLOC_PDATA;
76 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
83 int size = parent->driver->per_child_platdata_auto_alloc_size;
86 size = parent->uclass->uc_drv->
87 per_child_platdata_auto_alloc_size;
90 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
91 dev->parent_platdata = calloc(1, size);
92 if (!dev->parent_platdata) {
99 /* put dev into parent's successor list */
101 list_add_tail(&dev->sibling_node, &parent->child_head);
103 ret = uclass_bind_device(dev);
105 goto fail_uclass_bind;
107 /* if we fail to bind we remove device from successors and free it */
109 ret = drv->bind(dev);
113 if (parent && parent->driver->child_post_bind) {
114 ret = parent->driver->child_post_bind(dev);
116 goto fail_child_post_bind;
120 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
125 fail_child_post_bind:
126 if (drv->unbind && drv->unbind(dev)) {
127 dm_warn("unbind() method failed on dev '%s' on error path\n",
132 if (uclass_unbind_device(dev)) {
133 dm_warn("Failed to unbind dev '%s' on error path\n",
137 list_del(&dev->sibling_node);
138 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
139 free(dev->parent_platdata);
140 dev->parent_platdata = NULL;
143 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
145 dev->platdata = NULL;
153 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
154 const struct driver_info *info, struct udevice **devp)
158 drv = lists_driver_lookup_name(info->name);
161 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
164 return device_bind(parent, drv, info->name, (void *)info->platdata,
168 static void *alloc_priv(int size, uint flags)
172 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
173 priv = memalign(ARCH_DMA_MINALIGN, size);
175 memset(priv, '\0', size);
177 priv = calloc(1, size);
183 int device_probe_child(struct udevice *dev, void *parent_priv)
185 const struct driver *drv;
193 if (dev->flags & DM_FLAG_ACTIVATED)
199 /* Allocate private data if requested */
200 if (drv->priv_auto_alloc_size) {
201 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
207 /* Allocate private data if requested */
208 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
210 dev->uclass_priv = calloc(1, size);
211 if (!dev->uclass_priv) {
217 /* Ensure all parents are probed */
219 size = dev->parent->driver->per_child_auto_alloc_size;
221 size = dev->parent->uclass->uc_drv->
222 per_child_auto_alloc_size;
225 dev->parent_priv = alloc_priv(size, drv->flags);
226 if (!dev->parent_priv) {
231 memcpy(dev->parent_priv, parent_priv, size);
234 ret = device_probe(dev->parent);
239 seq = uclass_resolve_seq(dev);
246 ret = uclass_pre_probe_device(dev);
250 if (dev->parent && dev->parent->driver->child_pre_probe) {
251 ret = dev->parent->driver->child_pre_probe(dev);
256 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
257 ret = drv->ofdata_to_platdata(dev);
262 dev->flags |= DM_FLAG_ACTIVATED;
264 ret = drv->probe(dev);
266 dev->flags &= ~DM_FLAG_ACTIVATED;
271 ret = uclass_post_probe_device(dev);
273 dev->flags &= ~DM_FLAG_ACTIVATED;
279 if (device_remove(dev)) {
280 dm_warn("%s: Device '%s' failed to remove on error path\n",
281 __func__, dev->name);
290 int device_probe(struct udevice *dev)
292 return device_probe_child(dev, NULL);
295 void *dev_get_platdata(struct udevice *dev)
298 dm_warn("%s: null device\n", __func__);
302 return dev->platdata;
305 void *dev_get_parent_platdata(struct udevice *dev)
308 dm_warn("%s: null device", __func__);
312 return dev->parent_platdata;
315 void *dev_get_priv(struct udevice *dev)
318 dm_warn("%s: null device\n", __func__);
325 void *dev_get_uclass_priv(struct udevice *dev)
328 dm_warn("%s: null device\n", __func__);
332 return dev->uclass_priv;
335 void *dev_get_parentdata(struct udevice *dev)
338 dm_warn("%s: null device\n", __func__);
342 return dev->parent_priv;
345 static int device_get_device_tail(struct udevice *dev, int ret,
346 struct udevice **devp)
351 ret = device_probe(dev);
360 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
364 list_for_each_entry(dev, &parent->child_head, sibling_node) {
366 return device_get_device_tail(dev, 0, devp);
372 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
373 bool find_req_seq, struct udevice **devp)
378 if (seq_or_req_seq == -1)
381 list_for_each_entry(dev, &parent->child_head, sibling_node) {
382 if ((find_req_seq ? dev->req_seq : dev->seq) ==
392 int device_get_child_by_seq(struct udevice *parent, int seq,
393 struct udevice **devp)
399 ret = device_find_child_by_seq(parent, seq, false, &dev);
400 if (ret == -ENODEV) {
402 * We didn't find it in probed devices. See if there is one
403 * that will request this seq if probed.
405 ret = device_find_child_by_seq(parent, seq, true, &dev);
407 return device_get_device_tail(dev, ret, devp);
410 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
411 struct udevice **devp)
417 list_for_each_entry(dev, &parent->child_head, sibling_node) {
418 if (dev->of_offset == of_offset) {
427 int device_get_child_by_of_offset(struct udevice *parent, int seq,
428 struct udevice **devp)
434 ret = device_find_child_by_of_offset(parent, seq, &dev);
435 return device_get_device_tail(dev, ret, devp);
438 int device_find_first_child(struct udevice *parent, struct udevice **devp)
440 if (list_empty(&parent->child_head)) {
443 *devp = list_first_entry(&parent->child_head, struct udevice,
450 int device_find_next_child(struct udevice **devp)
452 struct udevice *dev = *devp;
453 struct udevice *parent = dev->parent;
455 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
458 *devp = list_entry(dev->sibling_node.next, struct udevice,
465 struct udevice *dev_get_parent(struct udevice *child)
467 return child->parent;
470 ulong dev_get_of_data(struct udevice *dev)
472 return dev->of_id->data;
475 enum uclass_id device_get_uclass_id(struct udevice *dev)
477 return dev->uclass->uc_drv->id;
480 #ifdef CONFIG_OF_CONTROL
481 fdt_addr_t dev_get_addr(struct udevice *dev)
483 return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
486 fdt_addr_t dev_get_addr(struct udevice *dev)
488 return FDT_ADDR_T_NONE;