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);
51 INIT_LIST_HEAD(&dev->devres_head);
53 dev->platdata = platdata;
55 dev->of_offset = of_offset;
62 if (CONFIG_IS_ENABLED(OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
64 * Some devices, such as a SPI bus, I2C bus and serial ports
65 * are numbered using aliases.
67 * This is just a 'requested' sequence, and will be
68 * resolved (and ->seq updated) when the device is probed.
70 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
71 if (uc->uc_drv->name && of_offset != -1) {
72 fdtdec_get_alias_seq(gd->fdt_blob,
73 uc->uc_drv->name, of_offset,
79 if (!dev->platdata && drv->platdata_auto_alloc_size) {
80 dev->flags |= DM_FLAG_ALLOC_PDATA;
81 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
88 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
90 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
91 dev->uclass_platdata = calloc(1, size);
92 if (!dev->uclass_platdata) {
99 size = parent->driver->per_child_platdata_auto_alloc_size;
101 size = parent->uclass->uc_drv->
102 per_child_platdata_auto_alloc_size;
105 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
106 dev->parent_platdata = calloc(1, size);
107 if (!dev->parent_platdata) {
114 /* put dev into parent's successor list */
116 list_add_tail(&dev->sibling_node, &parent->child_head);
118 ret = uclass_bind_device(dev);
120 goto fail_uclass_bind;
122 /* if we fail to bind we remove device from successors and free it */
124 ret = drv->bind(dev);
128 if (parent && parent->driver->child_post_bind) {
129 ret = parent->driver->child_post_bind(dev);
131 goto fail_child_post_bind;
135 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
138 dev->flags |= DM_FLAG_BOUND;
142 fail_child_post_bind:
143 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
144 if (drv->unbind && drv->unbind(dev)) {
145 dm_warn("unbind() method failed on dev '%s' on error path\n",
151 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
152 if (uclass_unbind_device(dev)) {
153 dm_warn("Failed to unbind dev '%s' on error path\n",
158 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
159 list_del(&dev->sibling_node);
160 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
161 free(dev->parent_platdata);
162 dev->parent_platdata = NULL;
166 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
167 free(dev->uclass_platdata);
168 dev->uclass_platdata = NULL;
171 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
173 dev->platdata = NULL;
176 devres_release_all(dev);
183 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
184 const struct driver_info *info, struct udevice **devp)
188 drv = lists_driver_lookup_name(info->name);
191 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
194 return device_bind(parent, drv, info->name, (void *)info->platdata,
198 static void *alloc_priv(int size, uint flags)
202 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
203 priv = memalign(ARCH_DMA_MINALIGN, size);
205 memset(priv, '\0', size);
207 priv = calloc(1, size);
213 int device_probe_child(struct udevice *dev, void *parent_priv)
215 const struct driver *drv;
223 if (dev->flags & DM_FLAG_ACTIVATED)
229 /* Allocate private data if requested */
230 if (drv->priv_auto_alloc_size) {
231 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
237 /* Allocate private data if requested */
238 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
240 dev->uclass_priv = calloc(1, size);
241 if (!dev->uclass_priv) {
247 /* Ensure all parents are probed */
249 size = dev->parent->driver->per_child_auto_alloc_size;
251 size = dev->parent->uclass->uc_drv->
252 per_child_auto_alloc_size;
255 dev->parent_priv = alloc_priv(size, drv->flags);
256 if (!dev->parent_priv) {
261 memcpy(dev->parent_priv, parent_priv, size);
264 ret = device_probe(dev->parent);
269 seq = uclass_resolve_seq(dev);
276 dev->flags |= DM_FLAG_ACTIVATED;
278 ret = uclass_pre_probe_device(dev);
282 if (dev->parent && dev->parent->driver->child_pre_probe) {
283 ret = dev->parent->driver->child_pre_probe(dev);
288 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
289 ret = drv->ofdata_to_platdata(dev);
295 ret = drv->probe(dev);
297 dev->flags &= ~DM_FLAG_ACTIVATED;
302 ret = uclass_post_probe_device(dev);
308 if (device_remove(dev)) {
309 dm_warn("%s: Device '%s' failed to remove on error path\n",
310 __func__, dev->name);
313 dev->flags &= ~DM_FLAG_ACTIVATED;
321 int device_probe(struct udevice *dev)
323 return device_probe_child(dev, NULL);
326 void *dev_get_platdata(struct udevice *dev)
329 dm_warn("%s: null device\n", __func__);
333 return dev->platdata;
336 void *dev_get_parent_platdata(struct udevice *dev)
339 dm_warn("%s: null device\n", __func__);
343 return dev->parent_platdata;
346 void *dev_get_uclass_platdata(struct udevice *dev)
349 dm_warn("%s: null device\n", __func__);
353 return dev->uclass_platdata;
356 void *dev_get_priv(struct udevice *dev)
359 dm_warn("%s: null device\n", __func__);
366 void *dev_get_uclass_priv(struct udevice *dev)
369 dm_warn("%s: null device\n", __func__);
373 return dev->uclass_priv;
376 void *dev_get_parentdata(struct udevice *dev)
379 dm_warn("%s: null device\n", __func__);
383 return dev->parent_priv;
386 static int device_get_device_tail(struct udevice *dev, int ret,
387 struct udevice **devp)
392 ret = device_probe(dev);
401 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
405 list_for_each_entry(dev, &parent->child_head, sibling_node) {
407 return device_get_device_tail(dev, 0, devp);
413 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
414 bool find_req_seq, struct udevice **devp)
419 if (seq_or_req_seq == -1)
422 list_for_each_entry(dev, &parent->child_head, sibling_node) {
423 if ((find_req_seq ? dev->req_seq : dev->seq) ==
433 int device_get_child_by_seq(struct udevice *parent, int seq,
434 struct udevice **devp)
440 ret = device_find_child_by_seq(parent, seq, false, &dev);
441 if (ret == -ENODEV) {
443 * We didn't find it in probed devices. See if there is one
444 * that will request this seq if probed.
446 ret = device_find_child_by_seq(parent, seq, true, &dev);
448 return device_get_device_tail(dev, ret, devp);
451 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
452 struct udevice **devp)
458 list_for_each_entry(dev, &parent->child_head, sibling_node) {
459 if (dev->of_offset == of_offset) {
468 int device_get_child_by_of_offset(struct udevice *parent, int node,
469 struct udevice **devp)
475 ret = device_find_child_by_of_offset(parent, node, &dev);
476 return device_get_device_tail(dev, ret, devp);
479 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
482 struct udevice *dev, *found;
484 if (parent->of_offset == of_offset)
487 list_for_each_entry(dev, &parent->child_head, sibling_node) {
488 found = _device_find_global_by_of_offset(dev, of_offset);
496 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
500 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
501 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
504 int device_find_first_child(struct udevice *parent, struct udevice **devp)
506 if (list_empty(&parent->child_head)) {
509 *devp = list_first_entry(&parent->child_head, struct udevice,
516 int device_find_next_child(struct udevice **devp)
518 struct udevice *dev = *devp;
519 struct udevice *parent = dev->parent;
521 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
524 *devp = list_entry(dev->sibling_node.next, struct udevice,
531 struct udevice *dev_get_parent(struct udevice *child)
533 return child->parent;
536 ulong dev_get_driver_data(struct udevice *dev)
538 return dev->driver_data;
541 const void *dev_get_driver_ops(struct udevice *dev)
543 if (!dev || !dev->driver->ops)
546 return dev->driver->ops;
549 enum uclass_id device_get_uclass_id(struct udevice *dev)
551 return dev->uclass->uc_drv->id;
554 const char *dev_get_uclass_name(struct udevice *dev)
559 return dev->uclass->uc_drv->name;
562 fdt_addr_t dev_get_addr(struct udevice *dev)
564 #if CONFIG_IS_ENABLED(OF_CONTROL)
567 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
568 if (addr != FDT_ADDR_T_NONE) {
569 if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS)
570 addr = simple_bus_translate(dev->parent, addr);
575 return FDT_ADDR_T_NONE;
579 bool device_has_children(struct udevice *dev)
581 return !list_empty(&dev->child_head);
584 bool device_has_active_children(struct udevice *dev)
586 struct udevice *child;
588 for (device_find_first_child(dev, &child);
590 device_find_next_child(&child)) {
591 if (device_active(child))
598 bool device_is_last_sibling(struct udevice *dev)
600 struct udevice *parent = dev->parent;
604 return list_is_last(&dev->sibling_node, &parent->child_head);
607 int device_set_name(struct udevice *dev, const char *name)