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);
137 fail_child_post_bind:
138 if (IS_ENABLED(DM_DEVICE_REMOVE)) {
139 if (drv->unbind && drv->unbind(dev)) {
140 dm_warn("unbind() method failed on dev '%s' on error path\n",
146 if (IS_ENABLED(DM_DEVICE_REMOVE)) {
147 if (uclass_unbind_device(dev)) {
148 dm_warn("Failed to unbind dev '%s' on error path\n",
153 if (IS_ENABLED(DM_DEVICE_REMOVE)) {
154 list_del(&dev->sibling_node);
155 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
156 free(dev->parent_platdata);
157 dev->parent_platdata = NULL;
161 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
162 free(dev->uclass_platdata);
163 dev->uclass_platdata = NULL;
166 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
168 dev->platdata = NULL;
176 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
177 const struct driver_info *info, struct udevice **devp)
181 drv = lists_driver_lookup_name(info->name);
184 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
187 return device_bind(parent, drv, info->name, (void *)info->platdata,
191 static void *alloc_priv(int size, uint flags)
195 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
196 priv = memalign(ARCH_DMA_MINALIGN, size);
198 memset(priv, '\0', size);
200 priv = calloc(1, size);
206 int device_probe_child(struct udevice *dev, void *parent_priv)
208 const struct driver *drv;
216 if (dev->flags & DM_FLAG_ACTIVATED)
222 /* Allocate private data if requested */
223 if (drv->priv_auto_alloc_size) {
224 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
230 /* Allocate private data if requested */
231 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
233 dev->uclass_priv = calloc(1, size);
234 if (!dev->uclass_priv) {
240 /* Ensure all parents are probed */
242 size = dev->parent->driver->per_child_auto_alloc_size;
244 size = dev->parent->uclass->uc_drv->
245 per_child_auto_alloc_size;
248 dev->parent_priv = alloc_priv(size, drv->flags);
249 if (!dev->parent_priv) {
254 memcpy(dev->parent_priv, parent_priv, size);
257 ret = device_probe(dev->parent);
262 seq = uclass_resolve_seq(dev);
269 dev->flags |= DM_FLAG_ACTIVATED;
271 ret = uclass_pre_probe_device(dev);
275 if (dev->parent && dev->parent->driver->child_pre_probe) {
276 ret = dev->parent->driver->child_pre_probe(dev);
281 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
282 ret = drv->ofdata_to_platdata(dev);
287 dev->flags |= DM_FLAG_ACTIVATED;
289 ret = drv->probe(dev);
291 dev->flags &= ~DM_FLAG_ACTIVATED;
296 ret = uclass_post_probe_device(dev);
302 if (device_remove(dev)) {
303 dm_warn("%s: Device '%s' failed to remove on error path\n",
304 __func__, dev->name);
307 dev->flags &= ~DM_FLAG_ACTIVATED;
315 int device_probe(struct udevice *dev)
317 return device_probe_child(dev, NULL);
320 void *dev_get_platdata(struct udevice *dev)
323 dm_warn("%s: null device\n", __func__);
327 return dev->platdata;
330 void *dev_get_parent_platdata(struct udevice *dev)
333 dm_warn("%s: null device", __func__);
337 return dev->parent_platdata;
340 void *dev_get_uclass_platdata(struct udevice *dev)
343 dm_warn("%s: null device", __func__);
347 return dev->uclass_platdata;
350 void *dev_get_priv(struct udevice *dev)
353 dm_warn("%s: null device\n", __func__);
360 void *dev_get_uclass_priv(struct udevice *dev)
363 dm_warn("%s: null device\n", __func__);
367 return dev->uclass_priv;
370 void *dev_get_parentdata(struct udevice *dev)
373 dm_warn("%s: null device\n", __func__);
377 return dev->parent_priv;
380 static int device_get_device_tail(struct udevice *dev, int ret,
381 struct udevice **devp)
386 ret = device_probe(dev);
395 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
399 list_for_each_entry(dev, &parent->child_head, sibling_node) {
401 return device_get_device_tail(dev, 0, devp);
407 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
408 bool find_req_seq, struct udevice **devp)
413 if (seq_or_req_seq == -1)
416 list_for_each_entry(dev, &parent->child_head, sibling_node) {
417 if ((find_req_seq ? dev->req_seq : dev->seq) ==
427 int device_get_child_by_seq(struct udevice *parent, int seq,
428 struct udevice **devp)
434 ret = device_find_child_by_seq(parent, seq, false, &dev);
435 if (ret == -ENODEV) {
437 * We didn't find it in probed devices. See if there is one
438 * that will request this seq if probed.
440 ret = device_find_child_by_seq(parent, seq, true, &dev);
442 return device_get_device_tail(dev, ret, devp);
445 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
446 struct udevice **devp)
452 list_for_each_entry(dev, &parent->child_head, sibling_node) {
453 if (dev->of_offset == of_offset) {
462 int device_get_child_by_of_offset(struct udevice *parent, int seq,
463 struct udevice **devp)
469 ret = device_find_child_by_of_offset(parent, seq, &dev);
470 return device_get_device_tail(dev, ret, devp);
473 int device_find_first_child(struct udevice *parent, struct udevice **devp)
475 if (list_empty(&parent->child_head)) {
478 *devp = list_first_entry(&parent->child_head, struct udevice,
485 int device_find_next_child(struct udevice **devp)
487 struct udevice *dev = *devp;
488 struct udevice *parent = dev->parent;
490 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
493 *devp = list_entry(dev->sibling_node.next, struct udevice,
500 struct udevice *dev_get_parent(struct udevice *child)
502 return child->parent;
505 ulong dev_get_driver_data(struct udevice *dev)
507 return dev->driver_data;
510 const void *dev_get_driver_ops(struct udevice *dev)
512 if (!dev || !dev->driver->ops)
515 return dev->driver->ops;
518 enum uclass_id device_get_uclass_id(struct udevice *dev)
520 return dev->uclass->uc_drv->id;
523 const char *dev_get_uclass_name(struct udevice *dev)
528 return dev->uclass->uc_drv->name;
531 #ifdef CONFIG_OF_CONTROL
532 fdt_addr_t dev_get_addr(struct udevice *dev)
534 return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
537 fdt_addr_t dev_get_addr(struct udevice *dev)
539 return FDT_ADDR_T_NONE;
543 bool device_has_children(struct udevice *dev)
545 return !list_empty(&dev->child_head);
548 bool device_has_active_children(struct udevice *dev)
550 struct udevice *child;
552 for (device_find_first_child(dev, &child);
554 device_find_next_child(&child)) {
555 if (device_active(child))
562 bool device_is_last_sibling(struct udevice *dev)
564 struct udevice *parent = dev->parent;
568 return list_is_last(&dev->sibling_node, &parent->child_head);