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/pinctrl.h>
19 #include <dm/platdata.h>
20 #include <dm/uclass.h>
21 #include <dm/uclass-internal.h>
23 #include <linux/err.h>
24 #include <linux/list.h>
26 DECLARE_GLOBAL_DATA_PTR;
28 int device_bind(struct udevice *parent, const struct driver *drv,
29 const char *name, void *platdata, int of_offset,
30 struct udevice **devp)
41 ret = uclass_get(drv->id, &uc);
45 dev = calloc(1, sizeof(struct udevice));
49 INIT_LIST_HEAD(&dev->sibling_node);
50 INIT_LIST_HEAD(&dev->child_head);
51 INIT_LIST_HEAD(&dev->uclass_node);
53 INIT_LIST_HEAD(&dev->devres_head);
55 dev->platdata = platdata;
57 dev->of_offset = of_offset;
64 if (CONFIG_IS_ENABLED(OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
66 * Some devices, such as a SPI bus, I2C bus and serial ports
67 * are numbered using aliases.
69 * This is just a 'requested' sequence, and will be
70 * resolved (and ->seq updated) when the device is probed.
72 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
73 if (uc->uc_drv->name && of_offset != -1) {
74 fdtdec_get_alias_seq(gd->fdt_blob,
75 uc->uc_drv->name, of_offset,
81 if (!dev->platdata && drv->platdata_auto_alloc_size) {
82 dev->flags |= DM_FLAG_ALLOC_PDATA;
83 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
90 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
92 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
93 dev->uclass_platdata = calloc(1, size);
94 if (!dev->uclass_platdata) {
101 size = parent->driver->per_child_platdata_auto_alloc_size;
103 size = parent->uclass->uc_drv->
104 per_child_platdata_auto_alloc_size;
107 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
108 dev->parent_platdata = calloc(1, size);
109 if (!dev->parent_platdata) {
116 /* put dev into parent's successor list */
118 list_add_tail(&dev->sibling_node, &parent->child_head);
120 ret = uclass_bind_device(dev);
122 goto fail_uclass_bind;
124 /* if we fail to bind we remove device from successors and free it */
126 ret = drv->bind(dev);
130 if (parent && parent->driver->child_post_bind) {
131 ret = parent->driver->child_post_bind(dev);
133 goto fail_child_post_bind;
137 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
141 dev->flags |= DM_FLAG_BOUND;
145 fail_child_post_bind:
146 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
147 if (drv->unbind && drv->unbind(dev)) {
148 dm_warn("unbind() method failed on dev '%s' on error path\n",
154 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
155 if (uclass_unbind_device(dev)) {
156 dm_warn("Failed to unbind dev '%s' on error path\n",
161 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
162 list_del(&dev->sibling_node);
163 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
164 free(dev->parent_platdata);
165 dev->parent_platdata = NULL;
169 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
170 free(dev->uclass_platdata);
171 dev->uclass_platdata = NULL;
174 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
176 dev->platdata = NULL;
179 devres_release_all(dev);
186 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
187 const struct driver_info *info, struct udevice **devp)
191 drv = lists_driver_lookup_name(info->name);
194 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
197 return device_bind(parent, drv, info->name, (void *)info->platdata,
201 static void *alloc_priv(int size, uint flags)
205 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
206 priv = memalign(ARCH_DMA_MINALIGN, size);
208 memset(priv, '\0', size);
210 priv = calloc(1, size);
216 int device_probe_child(struct udevice *dev, void *parent_priv)
218 const struct driver *drv;
226 if (dev->flags & DM_FLAG_ACTIVATED)
232 /* Allocate private data if requested and not reentered */
233 if (drv->priv_auto_alloc_size && !dev->priv) {
234 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
240 /* Allocate private data if requested and not reentered */
241 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
242 if (size && !dev->uclass_priv) {
243 dev->uclass_priv = calloc(1, size);
244 if (!dev->uclass_priv) {
250 /* Ensure all parents are probed */
252 size = dev->parent->driver->per_child_auto_alloc_size;
254 size = dev->parent->uclass->uc_drv->
255 per_child_auto_alloc_size;
257 if (size && !dev->parent_priv) {
258 dev->parent_priv = alloc_priv(size, drv->flags);
259 if (!dev->parent_priv) {
264 memcpy(dev->parent_priv, parent_priv, size);
267 ret = device_probe(dev->parent);
272 * The device might have already been probed during
273 * the call to device_probe() on its parent device
274 * (e.g. PCI bridge devices). Test the flags again
275 * so that we don't mess up the device.
277 if (dev->flags & DM_FLAG_ACTIVATED)
281 seq = uclass_resolve_seq(dev);
288 dev->flags |= DM_FLAG_ACTIVATED;
290 /* continue regardless of the result of pinctrl */
291 pinctrl_select_state(dev, "default");
293 ret = uclass_pre_probe_device(dev);
297 if (dev->parent && dev->parent->driver->child_pre_probe) {
298 ret = dev->parent->driver->child_pre_probe(dev);
303 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
304 ret = drv->ofdata_to_platdata(dev);
310 ret = drv->probe(dev);
312 dev->flags &= ~DM_FLAG_ACTIVATED;
317 ret = uclass_post_probe_device(dev);
323 if (device_remove(dev)) {
324 dm_warn("%s: Device '%s' failed to remove on error path\n",
325 __func__, dev->name);
328 dev->flags &= ~DM_FLAG_ACTIVATED;
336 int device_probe(struct udevice *dev)
338 return device_probe_child(dev, NULL);
341 void *dev_get_platdata(struct udevice *dev)
344 dm_warn("%s: null device\n", __func__);
348 return dev->platdata;
351 void *dev_get_parent_platdata(struct udevice *dev)
354 dm_warn("%s: null device\n", __func__);
358 return dev->parent_platdata;
361 void *dev_get_uclass_platdata(struct udevice *dev)
364 dm_warn("%s: null device\n", __func__);
368 return dev->uclass_platdata;
371 void *dev_get_priv(struct udevice *dev)
374 dm_warn("%s: null device\n", __func__);
381 void *dev_get_uclass_priv(struct udevice *dev)
384 dm_warn("%s: null device\n", __func__);
388 return dev->uclass_priv;
391 void *dev_get_parentdata(struct udevice *dev)
394 dm_warn("%s: null device\n", __func__);
398 return dev->parent_priv;
401 static int device_get_device_tail(struct udevice *dev, int ret,
402 struct udevice **devp)
407 ret = device_probe(dev);
416 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
420 list_for_each_entry(dev, &parent->child_head, sibling_node) {
422 return device_get_device_tail(dev, 0, devp);
428 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
429 bool find_req_seq, struct udevice **devp)
434 if (seq_or_req_seq == -1)
437 list_for_each_entry(dev, &parent->child_head, sibling_node) {
438 if ((find_req_seq ? dev->req_seq : dev->seq) ==
448 int device_get_child_by_seq(struct udevice *parent, int seq,
449 struct udevice **devp)
455 ret = device_find_child_by_seq(parent, seq, false, &dev);
456 if (ret == -ENODEV) {
458 * We didn't find it in probed devices. See if there is one
459 * that will request this seq if probed.
461 ret = device_find_child_by_seq(parent, seq, true, &dev);
463 return device_get_device_tail(dev, ret, devp);
466 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
467 struct udevice **devp)
473 list_for_each_entry(dev, &parent->child_head, sibling_node) {
474 if (dev->of_offset == of_offset) {
483 int device_get_child_by_of_offset(struct udevice *parent, int node,
484 struct udevice **devp)
490 ret = device_find_child_by_of_offset(parent, node, &dev);
491 return device_get_device_tail(dev, ret, devp);
494 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
497 struct udevice *dev, *found;
499 if (parent->of_offset == of_offset)
502 list_for_each_entry(dev, &parent->child_head, sibling_node) {
503 found = _device_find_global_by_of_offset(dev, of_offset);
511 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
515 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
516 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
519 int device_find_first_child(struct udevice *parent, struct udevice **devp)
521 if (list_empty(&parent->child_head)) {
524 *devp = list_first_entry(&parent->child_head, struct udevice,
531 int device_find_next_child(struct udevice **devp)
533 struct udevice *dev = *devp;
534 struct udevice *parent = dev->parent;
536 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
539 *devp = list_entry(dev->sibling_node.next, struct udevice,
546 struct udevice *dev_get_parent(struct udevice *child)
548 return child->parent;
551 ulong dev_get_driver_data(struct udevice *dev)
553 return dev->driver_data;
556 const void *dev_get_driver_ops(struct udevice *dev)
558 if (!dev || !dev->driver->ops)
561 return dev->driver->ops;
564 enum uclass_id device_get_uclass_id(struct udevice *dev)
566 return dev->uclass->uc_drv->id;
569 const char *dev_get_uclass_name(struct udevice *dev)
574 return dev->uclass->uc_drv->name;
577 fdt_addr_t dev_get_addr(struct udevice *dev)
579 #if CONFIG_IS_ENABLED(OF_CONTROL)
582 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
583 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
584 if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS)
585 addr = simple_bus_translate(dev->parent, addr);
590 return FDT_ADDR_T_NONE;
594 bool device_has_children(struct udevice *dev)
596 return !list_empty(&dev->child_head);
599 bool device_has_active_children(struct udevice *dev)
601 struct udevice *child;
603 for (device_find_first_child(dev, &child);
605 device_find_next_child(&child)) {
606 if (device_active(child))
613 bool device_is_last_sibling(struct udevice *dev)
615 struct udevice *parent = dev->parent;
619 return list_is_last(&dev->sibling_node, &parent->child_head);
622 int device_set_name(struct udevice *dev, const char *name)