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)
40 ret = uclass_get(drv->id, &uc);
44 dev = calloc(1, sizeof(struct udevice));
48 INIT_LIST_HEAD(&dev->sibling_node);
49 INIT_LIST_HEAD(&dev->child_head);
50 INIT_LIST_HEAD(&dev->uclass_node);
52 INIT_LIST_HEAD(&dev->devres_head);
54 dev->platdata = platdata;
56 dev->of_offset = of_offset;
63 if (CONFIG_IS_ENABLED(OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
65 * Some devices, such as a SPI bus, I2C bus and serial ports
66 * are numbered using aliases.
68 * This is just a 'requested' sequence, and will be
69 * resolved (and ->seq updated) when the device is probed.
71 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
72 if (uc->uc_drv->name && of_offset != -1) {
73 fdtdec_get_alias_seq(gd->fdt_blob,
74 uc->uc_drv->name, of_offset,
80 if (!dev->platdata && drv->platdata_auto_alloc_size) {
81 dev->flags |= DM_FLAG_ALLOC_PDATA;
82 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
89 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
91 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
92 dev->uclass_platdata = calloc(1, size);
93 if (!dev->uclass_platdata) {
100 size = parent->driver->per_child_platdata_auto_alloc_size;
102 size = parent->uclass->uc_drv->
103 per_child_platdata_auto_alloc_size;
106 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
107 dev->parent_platdata = calloc(1, size);
108 if (!dev->parent_platdata) {
115 /* put dev into parent's successor list */
117 list_add_tail(&dev->sibling_node, &parent->child_head);
119 ret = uclass_bind_device(dev);
121 goto fail_uclass_bind;
123 /* if we fail to bind we remove device from successors and free it */
125 ret = drv->bind(dev);
129 if (parent && parent->driver->child_post_bind) {
130 ret = parent->driver->child_post_bind(dev);
132 goto fail_child_post_bind;
136 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
140 dev->flags |= DM_FLAG_BOUND;
144 fail_child_post_bind:
145 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
146 if (drv->unbind && drv->unbind(dev)) {
147 dm_warn("unbind() method failed on dev '%s' on error path\n",
153 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
154 if (uclass_unbind_device(dev)) {
155 dm_warn("Failed to unbind dev '%s' on error path\n",
160 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
161 list_del(&dev->sibling_node);
162 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
163 free(dev->parent_platdata);
164 dev->parent_platdata = NULL;
168 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
169 free(dev->uclass_platdata);
170 dev->uclass_platdata = NULL;
173 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
175 dev->platdata = NULL;
178 devres_release_all(dev);
185 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
186 const struct driver_info *info, struct udevice **devp)
190 drv = lists_driver_lookup_name(info->name);
193 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
196 return device_bind(parent, drv, info->name, (void *)info->platdata,
200 static void *alloc_priv(int size, uint flags)
204 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
205 priv = memalign(ARCH_DMA_MINALIGN, size);
207 memset(priv, '\0', size);
209 priv = calloc(1, size);
215 int device_probe_child(struct udevice *dev, void *parent_priv)
217 const struct driver *drv;
225 if (dev->flags & DM_FLAG_ACTIVATED)
231 /* Allocate private data if requested and not reentered */
232 if (drv->priv_auto_alloc_size && !dev->priv) {
233 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
239 /* Allocate private data if requested and not reentered */
240 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
241 if (size && !dev->uclass_priv) {
242 dev->uclass_priv = calloc(1, size);
243 if (!dev->uclass_priv) {
249 /* Ensure all parents are probed */
251 size = dev->parent->driver->per_child_auto_alloc_size;
253 size = dev->parent->uclass->uc_drv->
254 per_child_auto_alloc_size;
256 if (size && !dev->parent_priv) {
257 dev->parent_priv = alloc_priv(size, drv->flags);
258 if (!dev->parent_priv) {
263 memcpy(dev->parent_priv, parent_priv, size);
266 ret = device_probe(dev->parent);
271 * The device might have already been probed during
272 * the call to device_probe() on its parent device
273 * (e.g. PCI bridge devices). Test the flags again
274 * so that we don't mess up the device.
276 if (dev->flags & DM_FLAG_ACTIVATED)
280 seq = uclass_resolve_seq(dev);
287 dev->flags |= DM_FLAG_ACTIVATED;
289 ret = uclass_pre_probe_device(dev);
293 if (dev->parent && dev->parent->driver->child_pre_probe) {
294 ret = dev->parent->driver->child_pre_probe(dev);
299 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
300 ret = drv->ofdata_to_platdata(dev);
306 ret = drv->probe(dev);
308 dev->flags &= ~DM_FLAG_ACTIVATED;
313 ret = uclass_post_probe_device(dev);
319 if (device_remove(dev)) {
320 dm_warn("%s: Device '%s' failed to remove on error path\n",
321 __func__, dev->name);
324 dev->flags &= ~DM_FLAG_ACTIVATED;
332 int device_probe(struct udevice *dev)
334 return device_probe_child(dev, NULL);
337 void *dev_get_platdata(struct udevice *dev)
340 dm_warn("%s: null device\n", __func__);
344 return dev->platdata;
347 void *dev_get_parent_platdata(struct udevice *dev)
350 dm_warn("%s: null device\n", __func__);
354 return dev->parent_platdata;
357 void *dev_get_uclass_platdata(struct udevice *dev)
360 dm_warn("%s: null device\n", __func__);
364 return dev->uclass_platdata;
367 void *dev_get_priv(struct udevice *dev)
370 dm_warn("%s: null device\n", __func__);
377 void *dev_get_uclass_priv(struct udevice *dev)
380 dm_warn("%s: null device\n", __func__);
384 return dev->uclass_priv;
387 void *dev_get_parentdata(struct udevice *dev)
390 dm_warn("%s: null device\n", __func__);
394 return dev->parent_priv;
397 static int device_get_device_tail(struct udevice *dev, int ret,
398 struct udevice **devp)
403 ret = device_probe(dev);
412 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
416 list_for_each_entry(dev, &parent->child_head, sibling_node) {
418 return device_get_device_tail(dev, 0, devp);
424 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
425 bool find_req_seq, struct udevice **devp)
430 if (seq_or_req_seq == -1)
433 list_for_each_entry(dev, &parent->child_head, sibling_node) {
434 if ((find_req_seq ? dev->req_seq : dev->seq) ==
444 int device_get_child_by_seq(struct udevice *parent, int seq,
445 struct udevice **devp)
451 ret = device_find_child_by_seq(parent, seq, false, &dev);
452 if (ret == -ENODEV) {
454 * We didn't find it in probed devices. See if there is one
455 * that will request this seq if probed.
457 ret = device_find_child_by_seq(parent, seq, true, &dev);
459 return device_get_device_tail(dev, ret, devp);
462 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
463 struct udevice **devp)
469 list_for_each_entry(dev, &parent->child_head, sibling_node) {
470 if (dev->of_offset == of_offset) {
479 int device_get_child_by_of_offset(struct udevice *parent, int node,
480 struct udevice **devp)
486 ret = device_find_child_by_of_offset(parent, node, &dev);
487 return device_get_device_tail(dev, ret, devp);
490 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
493 struct udevice *dev, *found;
495 if (parent->of_offset == of_offset)
498 list_for_each_entry(dev, &parent->child_head, sibling_node) {
499 found = _device_find_global_by_of_offset(dev, of_offset);
507 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
511 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
512 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
515 int device_find_first_child(struct udevice *parent, struct udevice **devp)
517 if (list_empty(&parent->child_head)) {
520 *devp = list_first_entry(&parent->child_head, struct udevice,
527 int device_find_next_child(struct udevice **devp)
529 struct udevice *dev = *devp;
530 struct udevice *parent = dev->parent;
532 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
535 *devp = list_entry(dev->sibling_node.next, struct udevice,
542 struct udevice *dev_get_parent(struct udevice *child)
544 return child->parent;
547 ulong dev_get_driver_data(struct udevice *dev)
549 return dev->driver_data;
552 const void *dev_get_driver_ops(struct udevice *dev)
554 if (!dev || !dev->driver->ops)
557 return dev->driver->ops;
560 enum uclass_id device_get_uclass_id(struct udevice *dev)
562 return dev->uclass->uc_drv->id;
565 const char *dev_get_uclass_name(struct udevice *dev)
570 return dev->uclass->uc_drv->name;
573 fdt_addr_t dev_get_addr(struct udevice *dev)
575 #if CONFIG_IS_ENABLED(OF_CONTROL)
578 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
579 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
580 if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS)
581 addr = simple_bus_translate(dev->parent, addr);
586 return FDT_ADDR_T_NONE;
590 bool device_has_children(struct udevice *dev)
592 return !list_empty(&dev->child_head);
595 bool device_has_active_children(struct udevice *dev)
597 struct udevice *child;
599 for (device_find_first_child(dev, &child);
601 device_find_next_child(&child)) {
602 if (device_active(child))
609 bool device_is_last_sibling(struct udevice *dev)
611 struct udevice *parent = dev->parent;
615 return list_is_last(&dev->sibling_node, &parent->child_head);
618 int device_set_name(struct udevice *dev, const char *name)