4 * Copyright (c) 2013 Google, Inc
9 * SPDX-License-Identifier: GPL-2.0+
15 #include <fdt_support.h>
17 #include <dm/device.h>
18 #include <dm/device-internal.h>
20 #include <dm/pinctrl.h>
21 #include <dm/platdata.h>
23 #include <dm/uclass.h>
24 #include <dm/uclass-internal.h>
26 #include <linux/err.h>
27 #include <linux/list.h>
29 DECLARE_GLOBAL_DATA_PTR;
31 static int device_bind_common(struct udevice *parent, const struct driver *drv,
32 const char *name, void *platdata,
33 ulong driver_data, ofnode node,
34 uint of_platdata_size, struct udevice **devp)
45 ret = uclass_get(drv->id, &uc);
47 debug("Missing uclass for driver %s\n", drv->name);
51 dev = calloc(1, sizeof(struct udevice));
55 INIT_LIST_HEAD(&dev->sibling_node);
56 INIT_LIST_HEAD(&dev->child_head);
57 INIT_LIST_HEAD(&dev->uclass_node);
59 INIT_LIST_HEAD(&dev->devres_head);
61 dev->platdata = platdata;
62 dev->driver_data = driver_data;
71 if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
73 * Some devices, such as a SPI bus, I2C bus and serial ports
74 * are numbered using aliases.
76 * This is just a 'requested' sequence, and will be
77 * resolved (and ->seq updated) when the device is probed.
79 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
80 if (uc->uc_drv->name && ofnode_valid(node)) {
81 dev_read_alias_seq(dev, &dev->req_seq);
86 if (drv->platdata_auto_alloc_size) {
87 bool alloc = !platdata;
89 if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
90 if (of_platdata_size) {
91 dev->flags |= DM_FLAG_OF_PLATDATA;
92 if (of_platdata_size <
93 drv->platdata_auto_alloc_size)
98 dev->flags |= DM_FLAG_ALLOC_PDATA;
99 dev->platdata = calloc(1,
100 drv->platdata_auto_alloc_size);
101 if (!dev->platdata) {
105 if (CONFIG_IS_ENABLED(OF_PLATDATA) && platdata) {
106 memcpy(dev->platdata, platdata,
112 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
114 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
115 dev->uclass_platdata = calloc(1, size);
116 if (!dev->uclass_platdata) {
123 size = parent->driver->per_child_platdata_auto_alloc_size;
125 size = parent->uclass->uc_drv->
126 per_child_platdata_auto_alloc_size;
129 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
130 dev->parent_platdata = calloc(1, size);
131 if (!dev->parent_platdata) {
138 /* put dev into parent's successor list */
140 list_add_tail(&dev->sibling_node, &parent->child_head);
142 ret = uclass_bind_device(dev);
144 goto fail_uclass_bind;
146 /* if we fail to bind we remove device from successors and free it */
148 ret = drv->bind(dev);
152 if (parent && parent->driver->child_post_bind) {
153 ret = parent->driver->child_post_bind(dev);
155 goto fail_child_post_bind;
157 if (uc->uc_drv->post_bind) {
158 ret = uc->uc_drv->post_bind(dev);
160 goto fail_uclass_post_bind;
164 pr_debug("Bound device %s to %s\n", dev->name, parent->name);
168 dev->flags |= DM_FLAG_BOUND;
172 fail_uclass_post_bind:
173 /* There is no child unbind() method, so no clean-up required */
174 fail_child_post_bind:
175 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
176 if (drv->unbind && drv->unbind(dev)) {
177 dm_warn("unbind() method failed on dev '%s' on error path\n",
183 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
184 if (uclass_unbind_device(dev)) {
185 dm_warn("Failed to unbind dev '%s' on error path\n",
190 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
191 list_del(&dev->sibling_node);
192 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
193 free(dev->parent_platdata);
194 dev->parent_platdata = NULL;
198 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
199 free(dev->uclass_platdata);
200 dev->uclass_platdata = NULL;
203 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
205 dev->platdata = NULL;
208 devres_release_all(dev);
215 int device_bind_with_driver_data(struct udevice *parent,
216 const struct driver *drv, const char *name,
217 ulong driver_data, ofnode node,
218 struct udevice **devp)
220 return device_bind_common(parent, drv, name, NULL, driver_data, node,
224 int device_bind(struct udevice *parent, const struct driver *drv,
225 const char *name, void *platdata, int of_offset,
226 struct udevice **devp)
228 return device_bind_common(parent, drv, name, platdata, 0,
229 offset_to_ofnode(of_offset), 0, devp);
232 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
233 const struct driver_info *info, struct udevice **devp)
236 uint platdata_size = 0;
238 drv = lists_driver_lookup_name(info->name);
241 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
244 #if CONFIG_IS_ENABLED(OF_PLATDATA)
245 platdata_size = info->platdata_size;
247 return device_bind_common(parent, drv, info->name,
248 (void *)info->platdata, 0, ofnode_null(), platdata_size,
252 static void *alloc_priv(int size, uint flags)
256 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
257 size = ROUND(size, ARCH_DMA_MINALIGN);
258 priv = memalign(ARCH_DMA_MINALIGN, size);
260 memset(priv, '\0', size);
263 * Ensure that the zero bytes are flushed to memory.
264 * This prevents problems if the driver uses this as
265 * both an input and an output buffer:
267 * 1. Zeroes written to buffer (here) and sit in the
269 * 2. Driver issues a read command to DMA
270 * 3. CPU runs out of cache space and evicts some cache
271 * data in the buffer, writing zeroes to RAM from
274 * 5. Buffer now has some DMA data and some zeroes
275 * 6. Data being read is now incorrect
277 * To prevent this, ensure that the cache is clean
278 * within this range at the start. The driver can then
279 * use normal flush-after-write, invalidate-before-read
285 #ifndef CONFIG_MICROBLAZE
286 flush_dcache_range((ulong)priv, (ulong)priv + size);
290 priv = calloc(1, size);
296 int device_probe(struct udevice *dev)
298 const struct driver *drv;
306 if (dev->flags & DM_FLAG_ACTIVATED)
312 /* Allocate private data if requested and not reentered */
313 if (drv->priv_auto_alloc_size && !dev->priv) {
314 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
320 /* Allocate private data if requested and not reentered */
321 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
322 if (size && !dev->uclass_priv) {
323 dev->uclass_priv = calloc(1, size);
324 if (!dev->uclass_priv) {
330 /* Ensure all parents are probed */
332 size = dev->parent->driver->per_child_auto_alloc_size;
334 size = dev->parent->uclass->uc_drv->
335 per_child_auto_alloc_size;
337 if (size && !dev->parent_priv) {
338 dev->parent_priv = alloc_priv(size, drv->flags);
339 if (!dev->parent_priv) {
345 ret = device_probe(dev->parent);
350 * The device might have already been probed during
351 * the call to device_probe() on its parent device
352 * (e.g. PCI bridge devices). Test the flags again
353 * so that we don't mess up the device.
355 if (dev->flags & DM_FLAG_ACTIVATED)
359 seq = uclass_resolve_seq(dev);
366 dev->flags |= DM_FLAG_ACTIVATED;
369 * Process pinctrl for everything except the root device, and
370 * continue regardless of the result of pinctrl. Don't process pinctrl
371 * settings for pinctrl devices since the device may not yet be
374 if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
375 pinctrl_select_state(dev, "default");
377 ret = uclass_pre_probe_device(dev);
381 if (dev->parent && dev->parent->driver->child_pre_probe) {
382 ret = dev->parent->driver->child_pre_probe(dev);
387 if (drv->ofdata_to_platdata && dev_has_of_node(dev)) {
388 ret = drv->ofdata_to_platdata(dev);
394 ret = drv->probe(dev);
396 dev->flags &= ~DM_FLAG_ACTIVATED;
401 ret = uclass_post_probe_device(dev);
405 if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
406 pinctrl_select_state(dev, "default");
410 if (device_remove(dev, DM_REMOVE_NORMAL)) {
411 dm_warn("%s: Device '%s' failed to remove on error path\n",
412 __func__, dev->name);
415 dev->flags &= ~DM_FLAG_ACTIVATED;
423 void *dev_get_platdata(struct udevice *dev)
426 dm_warn("%s: null device\n", __func__);
430 return dev->platdata;
433 void *dev_get_parent_platdata(struct udevice *dev)
436 dm_warn("%s: null device\n", __func__);
440 return dev->parent_platdata;
443 void *dev_get_uclass_platdata(struct udevice *dev)
446 dm_warn("%s: null device\n", __func__);
450 return dev->uclass_platdata;
453 void *dev_get_priv(struct udevice *dev)
456 dm_warn("%s: null device\n", __func__);
463 void *dev_get_uclass_priv(struct udevice *dev)
466 dm_warn("%s: null device\n", __func__);
470 return dev->uclass_priv;
473 void *dev_get_parent_priv(struct udevice *dev)
476 dm_warn("%s: null device\n", __func__);
480 return dev->parent_priv;
483 static int device_get_device_tail(struct udevice *dev, int ret,
484 struct udevice **devp)
489 ret = device_probe(dev);
498 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
502 list_for_each_entry(dev, &parent->child_head, sibling_node) {
504 return device_get_device_tail(dev, 0, devp);
510 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
511 bool find_req_seq, struct udevice **devp)
516 if (seq_or_req_seq == -1)
519 list_for_each_entry(dev, &parent->child_head, sibling_node) {
520 if ((find_req_seq ? dev->req_seq : dev->seq) ==
530 int device_get_child_by_seq(struct udevice *parent, int seq,
531 struct udevice **devp)
537 ret = device_find_child_by_seq(parent, seq, false, &dev);
538 if (ret == -ENODEV) {
540 * We didn't find it in probed devices. See if there is one
541 * that will request this seq if probed.
543 ret = device_find_child_by_seq(parent, seq, true, &dev);
545 return device_get_device_tail(dev, ret, devp);
548 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
549 struct udevice **devp)
555 list_for_each_entry(dev, &parent->child_head, sibling_node) {
556 if (dev_of_offset(dev) == of_offset) {
565 int device_get_child_by_of_offset(struct udevice *parent, int node,
566 struct udevice **devp)
572 ret = device_find_child_by_of_offset(parent, node, &dev);
573 return device_get_device_tail(dev, ret, devp);
576 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
579 struct udevice *dev, *found;
581 if (dev_of_offset(parent) == of_offset)
584 list_for_each_entry(dev, &parent->child_head, sibling_node) {
585 found = _device_find_global_by_of_offset(dev, of_offset);
593 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
597 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
598 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
601 int device_find_first_child(struct udevice *parent, struct udevice **devp)
603 if (list_empty(&parent->child_head)) {
606 *devp = list_first_entry(&parent->child_head, struct udevice,
613 int device_find_next_child(struct udevice **devp)
615 struct udevice *dev = *devp;
616 struct udevice *parent = dev->parent;
618 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
621 *devp = list_entry(dev->sibling_node.next, struct udevice,
628 struct udevice *dev_get_parent(struct udevice *child)
630 return child->parent;
633 ulong dev_get_driver_data(struct udevice *dev)
635 return dev->driver_data;
638 const void *dev_get_driver_ops(struct udevice *dev)
640 if (!dev || !dev->driver->ops)
643 return dev->driver->ops;
646 enum uclass_id device_get_uclass_id(struct udevice *dev)
648 return dev->uclass->uc_drv->id;
651 const char *dev_get_uclass_name(struct udevice *dev)
656 return dev->uclass->uc_drv->name;
659 bool device_has_children(struct udevice *dev)
661 return !list_empty(&dev->child_head);
664 bool device_has_active_children(struct udevice *dev)
666 struct udevice *child;
668 for (device_find_first_child(dev, &child);
670 device_find_next_child(&child)) {
671 if (device_active(child))
678 bool device_is_last_sibling(struct udevice *dev)
680 struct udevice *parent = dev->parent;
684 return list_is_last(&dev->sibling_node, &parent->child_head);
687 void device_set_name_alloced(struct udevice *dev)
689 dev->flags |= DM_FLAG_NAME_ALLOCED;
692 int device_set_name(struct udevice *dev, const char *name)
698 device_set_name_alloced(dev);
703 bool device_is_compatible(struct udevice *dev, const char *compat)
705 const void *fdt = gd->fdt_blob;
707 return !fdt_node_check_compatible(fdt, dev_of_offset(dev), compat);
710 bool of_machine_is_compatible(const char *compat)
712 const void *fdt = gd->fdt_blob;
714 return !fdt_node_check_compatible(fdt, 0, compat);