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 #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 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
85 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
86 dev->uclass_platdata = calloc(1, size);
87 if (!dev->uclass_platdata) {
94 size = parent->driver->per_child_platdata_auto_alloc_size;
96 size = parent->uclass->uc_drv->
97 per_child_platdata_auto_alloc_size;
100 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
101 dev->parent_platdata = calloc(1, size);
102 if (!dev->parent_platdata) {
109 /* put dev into parent's successor list */
111 list_add_tail(&dev->sibling_node, &parent->child_head);
113 ret = uclass_bind_device(dev);
115 goto fail_uclass_bind;
117 /* if we fail to bind we remove device from successors and free it */
119 ret = drv->bind(dev);
123 if (parent && parent->driver->child_post_bind) {
124 ret = parent->driver->child_post_bind(dev);
126 goto fail_child_post_bind;
130 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
135 fail_child_post_bind:
136 if (drv->unbind && drv->unbind(dev)) {
137 dm_warn("unbind() method failed on dev '%s' on error path\n",
142 if (uclass_unbind_device(dev)) {
143 dm_warn("Failed to unbind dev '%s' on error path\n",
147 list_del(&dev->sibling_node);
148 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
149 free(dev->parent_platdata);
150 dev->parent_platdata = NULL;
153 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
154 free(dev->uclass_platdata);
155 dev->uclass_platdata = NULL;
158 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
160 dev->platdata = NULL;
168 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
169 const struct driver_info *info, struct udevice **devp)
173 drv = lists_driver_lookup_name(info->name);
176 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
179 return device_bind(parent, drv, info->name, (void *)info->platdata,
183 static void *alloc_priv(int size, uint flags)
187 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
188 priv = memalign(ARCH_DMA_MINALIGN, size);
190 memset(priv, '\0', size);
192 priv = calloc(1, size);
198 int device_probe_child(struct udevice *dev, void *parent_priv)
200 const struct driver *drv;
208 if (dev->flags & DM_FLAG_ACTIVATED)
214 /* Allocate private data if requested */
215 if (drv->priv_auto_alloc_size) {
216 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
222 /* Allocate private data if requested */
223 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
225 dev->uclass_priv = calloc(1, size);
226 if (!dev->uclass_priv) {
232 /* Ensure all parents are probed */
234 size = dev->parent->driver->per_child_auto_alloc_size;
236 size = dev->parent->uclass->uc_drv->
237 per_child_auto_alloc_size;
240 dev->parent_priv = alloc_priv(size, drv->flags);
241 if (!dev->parent_priv) {
246 memcpy(dev->parent_priv, parent_priv, size);
249 ret = device_probe(dev->parent);
254 seq = uclass_resolve_seq(dev);
261 dev->flags |= DM_FLAG_ACTIVATED;
263 ret = uclass_pre_probe_device(dev);
267 if (dev->parent && dev->parent->driver->child_pre_probe) {
268 ret = dev->parent->driver->child_pre_probe(dev);
273 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
274 ret = drv->ofdata_to_platdata(dev);
279 dev->flags |= DM_FLAG_ACTIVATED;
281 ret = drv->probe(dev);
283 dev->flags &= ~DM_FLAG_ACTIVATED;
288 ret = uclass_post_probe_device(dev);
294 if (device_remove(dev)) {
295 dm_warn("%s: Device '%s' failed to remove on error path\n",
296 __func__, dev->name);
299 dev->flags &= ~DM_FLAG_ACTIVATED;
307 int device_probe(struct udevice *dev)
309 return device_probe_child(dev, NULL);
312 void *dev_get_platdata(struct udevice *dev)
315 dm_warn("%s: null device\n", __func__);
319 return dev->platdata;
322 void *dev_get_parent_platdata(struct udevice *dev)
325 dm_warn("%s: null device", __func__);
329 return dev->parent_platdata;
332 void *dev_get_uclass_platdata(struct udevice *dev)
335 dm_warn("%s: null device", __func__);
339 return dev->uclass_platdata;
342 void *dev_get_priv(struct udevice *dev)
345 dm_warn("%s: null device\n", __func__);
352 void *dev_get_uclass_priv(struct udevice *dev)
355 dm_warn("%s: null device\n", __func__);
359 return dev->uclass_priv;
362 void *dev_get_parentdata(struct udevice *dev)
365 dm_warn("%s: null device\n", __func__);
369 return dev->parent_priv;
372 static int device_get_device_tail(struct udevice *dev, int ret,
373 struct udevice **devp)
378 ret = device_probe(dev);
387 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
391 list_for_each_entry(dev, &parent->child_head, sibling_node) {
393 return device_get_device_tail(dev, 0, devp);
399 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
400 bool find_req_seq, struct udevice **devp)
405 if (seq_or_req_seq == -1)
408 list_for_each_entry(dev, &parent->child_head, sibling_node) {
409 if ((find_req_seq ? dev->req_seq : dev->seq) ==
419 int device_get_child_by_seq(struct udevice *parent, int seq,
420 struct udevice **devp)
426 ret = device_find_child_by_seq(parent, seq, false, &dev);
427 if (ret == -ENODEV) {
429 * We didn't find it in probed devices. See if there is one
430 * that will request this seq if probed.
432 ret = device_find_child_by_seq(parent, seq, true, &dev);
434 return device_get_device_tail(dev, ret, devp);
437 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
438 struct udevice **devp)
444 list_for_each_entry(dev, &parent->child_head, sibling_node) {
445 if (dev->of_offset == of_offset) {
454 int device_get_child_by_of_offset(struct udevice *parent, int seq,
455 struct udevice **devp)
461 ret = device_find_child_by_of_offset(parent, seq, &dev);
462 return device_get_device_tail(dev, ret, devp);
465 int device_find_first_child(struct udevice *parent, struct udevice **devp)
467 if (list_empty(&parent->child_head)) {
470 *devp = list_first_entry(&parent->child_head, struct udevice,
477 int device_find_next_child(struct udevice **devp)
479 struct udevice *dev = *devp;
480 struct udevice *parent = dev->parent;
482 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
485 *devp = list_entry(dev->sibling_node.next, struct udevice,
492 struct udevice *dev_get_parent(struct udevice *child)
494 return child->parent;
497 ulong dev_get_driver_data(struct udevice *dev)
499 return dev->driver_data;
502 const void *dev_get_driver_ops(struct udevice *dev)
504 if (!dev || !dev->driver->ops)
507 return dev->driver->ops;
510 enum uclass_id device_get_uclass_id(struct udevice *dev)
512 return dev->uclass->uc_drv->id;
515 #ifdef CONFIG_OF_CONTROL
516 fdt_addr_t dev_get_addr(struct udevice *dev)
518 return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
521 fdt_addr_t dev_get_addr(struct udevice *dev)
523 return FDT_ADDR_T_NONE;
527 bool device_has_children(struct udevice *dev)
529 return !list_empty(&dev->child_head);
532 bool device_has_active_children(struct udevice *dev)
534 struct udevice *child;
536 for (device_find_first_child(dev, &child);
538 device_find_next_child(&child)) {
539 if (device_active(child))
546 bool device_is_last_sibling(struct udevice *dev)
548 struct udevice *parent = dev->parent;
552 return list_is_last(&dev->sibling_node, &parent->child_head);