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, struct driver *drv, const char *name,
28 void *platdata, int of_offset, struct udevice **devp)
38 ret = uclass_get(drv->id, &uc);
42 dev = calloc(1, sizeof(struct udevice));
46 INIT_LIST_HEAD(&dev->sibling_node);
47 INIT_LIST_HEAD(&dev->child_head);
48 INIT_LIST_HEAD(&dev->uclass_node);
49 dev->platdata = platdata;
51 dev->of_offset = of_offset;
58 #ifdef CONFIG_OF_CONTROL
60 * Some devices, such as a SPI bus, I2C bus and serial ports are
61 * numbered using aliases.
63 * This is just a 'requested' sequence, and will be
64 * resolved (and ->seq updated) when the device is probed.
66 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
67 if (uc->uc_drv->name && of_offset != -1) {
68 fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name,
69 of_offset, &dev->req_seq);
73 if (!dev->platdata && drv->platdata_auto_alloc_size) {
74 dev->flags |= DM_FLAG_ALLOC_PDATA;
75 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
82 int size = parent->driver->per_child_platdata_auto_alloc_size;
85 size = parent->uclass->uc_drv->
86 per_child_platdata_auto_alloc_size;
89 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
90 dev->parent_platdata = calloc(1, size);
91 if (!dev->parent_platdata) {
98 /* put dev into parent's successor list */
100 list_add_tail(&dev->sibling_node, &parent->child_head);
102 ret = uclass_bind_device(dev);
104 goto fail_uclass_bind;
106 /* if we fail to bind we remove device from successors and free it */
108 ret = drv->bind(dev);
112 if (parent && parent->driver->child_post_bind) {
113 ret = parent->driver->child_post_bind(dev);
115 goto fail_child_post_bind;
119 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
124 fail_child_post_bind:
125 if (drv->unbind && drv->unbind(dev)) {
126 dm_warn("unbind() method failed on dev '%s' on error path\n",
131 if (uclass_unbind_device(dev)) {
132 dm_warn("Failed to unbind dev '%s' on error path\n",
136 list_del(&dev->sibling_node);
137 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
138 free(dev->parent_platdata);
139 dev->parent_platdata = NULL;
142 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
144 dev->platdata = NULL;
152 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
153 const struct driver_info *info, struct udevice **devp)
157 drv = lists_driver_lookup_name(info->name);
160 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
163 return device_bind(parent, drv, info->name, (void *)info->platdata,
167 static void *alloc_priv(int size, uint flags)
171 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
172 priv = memalign(ARCH_DMA_MINALIGN, size);
174 memset(priv, '\0', size);
176 priv = calloc(1, size);
182 int device_probe_child(struct udevice *dev, void *parent_priv)
192 if (dev->flags & DM_FLAG_ACTIVATED)
198 /* Allocate private data if requested */
199 if (drv->priv_auto_alloc_size) {
200 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
206 /* Allocate private data if requested */
207 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
209 dev->uclass_priv = calloc(1, size);
210 if (!dev->uclass_priv) {
216 /* Ensure all parents are probed */
218 size = dev->parent->driver->per_child_auto_alloc_size;
220 size = dev->parent->uclass->uc_drv->
221 per_child_auto_alloc_size;
224 dev->parent_priv = alloc_priv(size, drv->flags);
225 if (!dev->parent_priv) {
230 memcpy(dev->parent_priv, parent_priv, size);
233 ret = device_probe(dev->parent);
238 seq = uclass_resolve_seq(dev);
245 ret = uclass_pre_probe_device(dev);
249 if (dev->parent && dev->parent->driver->child_pre_probe) {
250 ret = dev->parent->driver->child_pre_probe(dev);
255 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
256 ret = drv->ofdata_to_platdata(dev);
261 dev->flags |= DM_FLAG_ACTIVATED;
263 ret = drv->probe(dev);
265 dev->flags &= ~DM_FLAG_ACTIVATED;
270 ret = uclass_post_probe_device(dev);
272 dev->flags &= ~DM_FLAG_ACTIVATED;
278 if (device_remove(dev)) {
279 dm_warn("%s: Device '%s' failed to remove on error path\n",
280 __func__, dev->name);
289 int device_probe(struct udevice *dev)
291 return device_probe_child(dev, NULL);
294 void *dev_get_platdata(struct udevice *dev)
297 dm_warn("%s: null device\n", __func__);
301 return dev->platdata;
304 void *dev_get_parent_platdata(struct udevice *dev)
307 dm_warn("%s: null device", __func__);
311 return dev->parent_platdata;
314 void *dev_get_priv(struct udevice *dev)
317 dm_warn("%s: null device\n", __func__);
324 void *dev_get_uclass_priv(struct udevice *dev)
327 dm_warn("%s: null device\n", __func__);
331 return dev->uclass_priv;
334 void *dev_get_parentdata(struct udevice *dev)
337 dm_warn("%s: null device\n", __func__);
341 return dev->parent_priv;
344 static int device_get_device_tail(struct udevice *dev, int ret,
345 struct udevice **devp)
350 ret = device_probe(dev);
359 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
363 list_for_each_entry(dev, &parent->child_head, sibling_node) {
365 return device_get_device_tail(dev, 0, devp);
371 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
372 bool find_req_seq, struct udevice **devp)
377 if (seq_or_req_seq == -1)
380 list_for_each_entry(dev, &parent->child_head, sibling_node) {
381 if ((find_req_seq ? dev->req_seq : dev->seq) ==
391 int device_get_child_by_seq(struct udevice *parent, int seq,
392 struct udevice **devp)
398 ret = device_find_child_by_seq(parent, seq, false, &dev);
399 if (ret == -ENODEV) {
401 * We didn't find it in probed devices. See if there is one
402 * that will request this seq if probed.
404 ret = device_find_child_by_seq(parent, seq, true, &dev);
406 return device_get_device_tail(dev, ret, devp);
409 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
410 struct udevice **devp)
416 list_for_each_entry(dev, &parent->child_head, sibling_node) {
417 if (dev->of_offset == of_offset) {
426 int device_get_child_by_of_offset(struct udevice *parent, int seq,
427 struct udevice **devp)
433 ret = device_find_child_by_of_offset(parent, seq, &dev);
434 return device_get_device_tail(dev, ret, devp);
437 int device_find_first_child(struct udevice *parent, struct udevice **devp)
439 if (list_empty(&parent->child_head)) {
442 *devp = list_first_entry(&parent->child_head, struct udevice,
449 int device_find_next_child(struct udevice **devp)
451 struct udevice *dev = *devp;
452 struct udevice *parent = dev->parent;
454 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
457 *devp = list_entry(dev->sibling_node.next, struct udevice,
464 struct udevice *dev_get_parent(struct udevice *child)
466 return child->parent;
469 ulong dev_get_of_data(struct udevice *dev)
471 return dev->of_id->data;
474 enum uclass_id device_get_uclass_id(struct udevice *dev)
476 return dev->uclass->uc_drv->id;
479 #ifdef CONFIG_OF_CONTROL
480 fdt_addr_t dev_get_addr(struct udevice *dev)
482 return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
485 fdt_addr_t dev_get_addr(struct udevice *dev)
487 return FDT_ADDR_T_NONE;