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 dev->platdata = platdata;
52 dev->of_offset = of_offset;
59 if (IS_ENABLED(CONFIG_OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
61 * Some devices, such as a SPI bus, I2C bus and serial ports
62 * are 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,
70 uc->uc_drv->name, of_offset,
76 if (!dev->platdata && drv->platdata_auto_alloc_size) {
77 dev->flags |= DM_FLAG_ALLOC_PDATA;
78 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
85 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
87 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
88 dev->uclass_platdata = calloc(1, size);
89 if (!dev->uclass_platdata) {
96 size = parent->driver->per_child_platdata_auto_alloc_size;
98 size = parent->uclass->uc_drv->
99 per_child_platdata_auto_alloc_size;
102 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
103 dev->parent_platdata = calloc(1, size);
104 if (!dev->parent_platdata) {
111 /* put dev into parent's successor list */
113 list_add_tail(&dev->sibling_node, &parent->child_head);
115 ret = uclass_bind_device(dev);
117 goto fail_uclass_bind;
119 /* if we fail to bind we remove device from successors and free it */
121 ret = drv->bind(dev);
125 if (parent && parent->driver->child_post_bind) {
126 ret = parent->driver->child_post_bind(dev);
128 goto fail_child_post_bind;
132 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
135 dev->flags |= DM_FLAG_BOUND;
139 fail_child_post_bind:
140 if (IS_ENABLED(CONFIG_DM_DEVICE_REMOVE)) {
141 if (drv->unbind && drv->unbind(dev)) {
142 dm_warn("unbind() method failed on dev '%s' on error path\n",
148 if (IS_ENABLED(CONFIG_DM_DEVICE_REMOVE)) {
149 if (uclass_unbind_device(dev)) {
150 dm_warn("Failed to unbind dev '%s' on error path\n",
155 if (IS_ENABLED(CONFIG_DM_DEVICE_REMOVE)) {
156 list_del(&dev->sibling_node);
157 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
158 free(dev->parent_platdata);
159 dev->parent_platdata = NULL;
163 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
164 free(dev->uclass_platdata);
165 dev->uclass_platdata = NULL;
168 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
170 dev->platdata = NULL;
178 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
179 const struct driver_info *info, struct udevice **devp)
183 drv = lists_driver_lookup_name(info->name);
186 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
189 return device_bind(parent, drv, info->name, (void *)info->platdata,
193 static void *alloc_priv(int size, uint flags)
197 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
198 priv = memalign(ARCH_DMA_MINALIGN, size);
200 memset(priv, '\0', size);
202 priv = calloc(1, size);
208 int device_probe_child(struct udevice *dev, void *parent_priv)
210 const struct driver *drv;
218 if (dev->flags & DM_FLAG_ACTIVATED)
224 /* Allocate private data if requested */
225 if (drv->priv_auto_alloc_size) {
226 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
232 /* Allocate private data if requested */
233 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
235 dev->uclass_priv = calloc(1, size);
236 if (!dev->uclass_priv) {
242 /* Ensure all parents are probed */
244 size = dev->parent->driver->per_child_auto_alloc_size;
246 size = dev->parent->uclass->uc_drv->
247 per_child_auto_alloc_size;
250 dev->parent_priv = alloc_priv(size, drv->flags);
251 if (!dev->parent_priv) {
256 memcpy(dev->parent_priv, parent_priv, size);
259 ret = device_probe(dev->parent);
264 seq = uclass_resolve_seq(dev);
271 dev->flags |= DM_FLAG_ACTIVATED;
273 ret = uclass_pre_probe_device(dev);
277 if (dev->parent && dev->parent->driver->child_pre_probe) {
278 ret = dev->parent->driver->child_pre_probe(dev);
283 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
284 ret = drv->ofdata_to_platdata(dev);
290 ret = drv->probe(dev);
292 dev->flags &= ~DM_FLAG_ACTIVATED;
297 ret = uclass_post_probe_device(dev);
303 if (device_remove(dev)) {
304 dm_warn("%s: Device '%s' failed to remove on error path\n",
305 __func__, dev->name);
308 dev->flags &= ~DM_FLAG_ACTIVATED;
316 int device_probe(struct udevice *dev)
318 return device_probe_child(dev, NULL);
321 void *dev_get_platdata(struct udevice *dev)
324 dm_warn("%s: null device\n", __func__);
328 return dev->platdata;
331 void *dev_get_parent_platdata(struct udevice *dev)
334 dm_warn("%s: null device\n", __func__);
338 return dev->parent_platdata;
341 void *dev_get_uclass_platdata(struct udevice *dev)
344 dm_warn("%s: null device\n", __func__);
348 return dev->uclass_platdata;
351 void *dev_get_priv(struct udevice *dev)
354 dm_warn("%s: null device\n", __func__);
361 void *dev_get_uclass_priv(struct udevice *dev)
364 dm_warn("%s: null device\n", __func__);
368 return dev->uclass_priv;
371 void *dev_get_parentdata(struct udevice *dev)
374 dm_warn("%s: null device\n", __func__);
378 return dev->parent_priv;
381 static int device_get_device_tail(struct udevice *dev, int ret,
382 struct udevice **devp)
387 ret = device_probe(dev);
396 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
400 list_for_each_entry(dev, &parent->child_head, sibling_node) {
402 return device_get_device_tail(dev, 0, devp);
408 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
409 bool find_req_seq, struct udevice **devp)
414 if (seq_or_req_seq == -1)
417 list_for_each_entry(dev, &parent->child_head, sibling_node) {
418 if ((find_req_seq ? dev->req_seq : dev->seq) ==
428 int device_get_child_by_seq(struct udevice *parent, int seq,
429 struct udevice **devp)
435 ret = device_find_child_by_seq(parent, seq, false, &dev);
436 if (ret == -ENODEV) {
438 * We didn't find it in probed devices. See if there is one
439 * that will request this seq if probed.
441 ret = device_find_child_by_seq(parent, seq, true, &dev);
443 return device_get_device_tail(dev, ret, devp);
446 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
447 struct udevice **devp)
453 list_for_each_entry(dev, &parent->child_head, sibling_node) {
454 if (dev->of_offset == of_offset) {
463 int device_get_child_by_of_offset(struct udevice *parent, int node,
464 struct udevice **devp)
470 ret = device_find_child_by_of_offset(parent, node, &dev);
471 return device_get_device_tail(dev, ret, devp);
474 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
477 struct udevice *dev, *found;
479 if (parent->of_offset == of_offset)
482 list_for_each_entry(dev, &parent->child_head, sibling_node) {
483 found = _device_find_global_by_of_offset(dev, of_offset);
491 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
495 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
496 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
499 int device_find_first_child(struct udevice *parent, struct udevice **devp)
501 if (list_empty(&parent->child_head)) {
504 *devp = list_first_entry(&parent->child_head, struct udevice,
511 int device_find_next_child(struct udevice **devp)
513 struct udevice *dev = *devp;
514 struct udevice *parent = dev->parent;
516 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
519 *devp = list_entry(dev->sibling_node.next, struct udevice,
526 struct udevice *dev_get_parent(struct udevice *child)
528 return child->parent;
531 ulong dev_get_driver_data(struct udevice *dev)
533 return dev->driver_data;
536 const void *dev_get_driver_ops(struct udevice *dev)
538 if (!dev || !dev->driver->ops)
541 return dev->driver->ops;
544 enum uclass_id device_get_uclass_id(struct udevice *dev)
546 return dev->uclass->uc_drv->id;
549 const char *dev_get_uclass_name(struct udevice *dev)
554 return dev->uclass->uc_drv->name;
557 fdt_addr_t dev_get_addr(struct udevice *dev)
559 #ifdef CONFIG_OF_CONTROL
562 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
563 if (addr != FDT_ADDR_T_NONE) {
564 if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS)
565 addr = simple_bus_translate(dev->parent, addr);
570 return FDT_ADDR_T_NONE;
574 bool device_has_children(struct udevice *dev)
576 return !list_empty(&dev->child_head);
579 bool device_has_active_children(struct udevice *dev)
581 struct udevice *child;
583 for (device_find_first_child(dev, &child);
585 device_find_next_child(&child)) {
586 if (device_active(child))
593 bool device_is_last_sibling(struct udevice *dev)
595 struct udevice *parent = dev->parent;
599 return list_is_last(&dev->sibling_node, &parent->child_head);