1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2013 Google, Inc
8 * Pavel Herrmann <morpheus.ibis@gmail.com>
15 #include <fdt_support.h>
17 #include <dm/device.h>
18 #include <dm/device-internal.h>
20 #include <dm/of_access.h>
21 #include <dm/pinctrl.h>
22 #include <dm/platdata.h>
24 #include <dm/uclass.h>
25 #include <dm/uclass-internal.h>
27 #include <linux/err.h>
28 #include <linux/list.h>
30 DECLARE_GLOBAL_DATA_PTR;
32 static int device_bind_common(struct udevice *parent, const struct driver *drv,
33 const char *name, void *platdata,
34 ulong driver_data, ofnode node,
35 uint of_platdata_size, struct udevice **devp)
46 ret = uclass_get(drv->id, &uc);
48 debug("Missing uclass for driver %s\n", drv->name);
52 dev = calloc(1, sizeof(struct udevice));
56 INIT_LIST_HEAD(&dev->sibling_node);
57 INIT_LIST_HEAD(&dev->child_head);
58 INIT_LIST_HEAD(&dev->uclass_node);
60 INIT_LIST_HEAD(&dev->devres_head);
62 dev->platdata = platdata;
63 dev->driver_data = driver_data;
72 if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
74 * Some devices, such as a SPI bus, I2C bus and serial ports
75 * are numbered using aliases.
77 * This is just a 'requested' sequence, and will be
78 * resolved (and ->seq updated) when the device is probed.
80 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
81 if (uc->uc_drv->name && ofnode_valid(node)) {
82 dev_read_alias_seq(dev, &dev->req_seq);
87 if (drv->platdata_auto_alloc_size) {
88 bool alloc = !platdata;
90 if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
91 if (of_platdata_size) {
92 dev->flags |= DM_FLAG_OF_PLATDATA;
93 if (of_platdata_size <
94 drv->platdata_auto_alloc_size)
99 dev->flags |= DM_FLAG_ALLOC_PDATA;
100 dev->platdata = calloc(1,
101 drv->platdata_auto_alloc_size);
102 if (!dev->platdata) {
106 if (CONFIG_IS_ENABLED(OF_PLATDATA) && platdata) {
107 memcpy(dev->platdata, platdata,
113 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
115 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
116 dev->uclass_platdata = calloc(1, size);
117 if (!dev->uclass_platdata) {
124 size = parent->driver->per_child_platdata_auto_alloc_size;
126 size = parent->uclass->uc_drv->
127 per_child_platdata_auto_alloc_size;
130 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
131 dev->parent_platdata = calloc(1, size);
132 if (!dev->parent_platdata) {
139 /* put dev into parent's successor list */
141 list_add_tail(&dev->sibling_node, &parent->child_head);
143 ret = uclass_bind_device(dev);
145 goto fail_uclass_bind;
147 /* if we fail to bind we remove device from successors and free it */
149 ret = drv->bind(dev);
153 if (parent && parent->driver->child_post_bind) {
154 ret = parent->driver->child_post_bind(dev);
156 goto fail_child_post_bind;
158 if (uc->uc_drv->post_bind) {
159 ret = uc->uc_drv->post_bind(dev);
161 goto fail_uclass_post_bind;
165 pr_debug("Bound device %s to %s\n", dev->name, parent->name);
169 dev->flags |= DM_FLAG_BOUND;
173 fail_uclass_post_bind:
174 /* There is no child unbind() method, so no clean-up required */
175 fail_child_post_bind:
176 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
177 if (drv->unbind && drv->unbind(dev)) {
178 dm_warn("unbind() method failed on dev '%s' on error path\n",
184 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
185 if (uclass_unbind_device(dev)) {
186 dm_warn("Failed to unbind dev '%s' on error path\n",
191 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
192 list_del(&dev->sibling_node);
193 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
194 free(dev->parent_platdata);
195 dev->parent_platdata = NULL;
199 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
200 free(dev->uclass_platdata);
201 dev->uclass_platdata = NULL;
204 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
206 dev->platdata = NULL;
209 devres_release_all(dev);
216 int device_bind_with_driver_data(struct udevice *parent,
217 const struct driver *drv, const char *name,
218 ulong driver_data, ofnode node,
219 struct udevice **devp)
221 return device_bind_common(parent, drv, name, NULL, driver_data, node,
225 int device_bind(struct udevice *parent, const struct driver *drv,
226 const char *name, void *platdata, int of_offset,
227 struct udevice **devp)
229 return device_bind_common(parent, drv, name, platdata, 0,
230 offset_to_ofnode(of_offset), 0, devp);
233 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
234 const struct driver_info *info, struct udevice **devp)
237 uint platdata_size = 0;
239 drv = lists_driver_lookup_name(info->name);
242 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
245 #if CONFIG_IS_ENABLED(OF_PLATDATA)
246 platdata_size = info->platdata_size;
248 return device_bind_common(parent, drv, info->name,
249 (void *)info->platdata, 0, ofnode_null(), platdata_size,
253 static void *alloc_priv(int size, uint flags)
257 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
258 size = ROUND(size, ARCH_DMA_MINALIGN);
259 priv = memalign(ARCH_DMA_MINALIGN, size);
261 memset(priv, '\0', size);
264 * Ensure that the zero bytes are flushed to memory.
265 * This prevents problems if the driver uses this as
266 * both an input and an output buffer:
268 * 1. Zeroes written to buffer (here) and sit in the
270 * 2. Driver issues a read command to DMA
271 * 3. CPU runs out of cache space and evicts some cache
272 * data in the buffer, writing zeroes to RAM from
275 * 5. Buffer now has some DMA data and some zeroes
276 * 6. Data being read is now incorrect
278 * To prevent this, ensure that the cache is clean
279 * within this range at the start. The driver can then
280 * use normal flush-after-write, invalidate-before-read
283 * TODO(sjg@chromium.org): Drop this microblaze
286 #ifndef CONFIG_MICROBLAZE
287 flush_dcache_range((ulong)priv, (ulong)priv + size);
291 priv = calloc(1, size);
297 int device_probe(struct udevice *dev)
299 const struct driver *drv;
307 if (dev->flags & DM_FLAG_ACTIVATED)
313 /* Allocate private data if requested and not reentered */
314 if (drv->priv_auto_alloc_size && !dev->priv) {
315 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
321 /* Allocate private data if requested and not reentered */
322 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
323 if (size && !dev->uclass_priv) {
324 dev->uclass_priv = calloc(1, size);
325 if (!dev->uclass_priv) {
331 /* Ensure all parents are probed */
333 size = dev->parent->driver->per_child_auto_alloc_size;
335 size = dev->parent->uclass->uc_drv->
336 per_child_auto_alloc_size;
338 if (size && !dev->parent_priv) {
339 dev->parent_priv = alloc_priv(size, drv->flags);
340 if (!dev->parent_priv) {
346 ret = device_probe(dev->parent);
351 * The device might have already been probed during
352 * the call to device_probe() on its parent device
353 * (e.g. PCI bridge devices). Test the flags again
354 * so that we don't mess up the device.
356 if (dev->flags & DM_FLAG_ACTIVATED)
360 seq = uclass_resolve_seq(dev);
367 dev->flags |= DM_FLAG_ACTIVATED;
370 * Process pinctrl for everything except the root device, and
371 * continue regardless of the result of pinctrl. Don't process pinctrl
372 * settings for pinctrl devices since the device may not yet be
375 if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
376 pinctrl_select_state(dev, "default");
378 ret = uclass_pre_probe_device(dev);
382 if (dev->parent && dev->parent->driver->child_pre_probe) {
383 ret = dev->parent->driver->child_pre_probe(dev);
388 if (drv->ofdata_to_platdata && dev_has_of_node(dev)) {
389 ret = drv->ofdata_to_platdata(dev);
394 /* Process 'assigned-{clocks/clock-parents/clock-rates}' properties */
395 ret = clk_set_defaults(dev);
400 ret = drv->probe(dev);
402 dev->flags &= ~DM_FLAG_ACTIVATED;
407 ret = uclass_post_probe_device(dev);
411 if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
412 pinctrl_select_state(dev, "default");
416 if (device_remove(dev, DM_REMOVE_NORMAL)) {
417 dm_warn("%s: Device '%s' failed to remove on error path\n",
418 __func__, dev->name);
421 dev->flags &= ~DM_FLAG_ACTIVATED;
429 void *dev_get_platdata(struct udevice *dev)
432 dm_warn("%s: null device\n", __func__);
436 return dev->platdata;
439 void *dev_get_parent_platdata(struct udevice *dev)
442 dm_warn("%s: null device\n", __func__);
446 return dev->parent_platdata;
449 void *dev_get_uclass_platdata(struct udevice *dev)
452 dm_warn("%s: null device\n", __func__);
456 return dev->uclass_platdata;
459 void *dev_get_priv(struct udevice *dev)
462 dm_warn("%s: null device\n", __func__);
469 void *dev_get_uclass_priv(struct udevice *dev)
472 dm_warn("%s: null device\n", __func__);
476 return dev->uclass_priv;
479 void *dev_get_parent_priv(struct udevice *dev)
482 dm_warn("%s: null device\n", __func__);
486 return dev->parent_priv;
489 static int device_get_device_tail(struct udevice *dev, int ret,
490 struct udevice **devp)
495 ret = device_probe(dev);
504 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
508 list_for_each_entry(dev, &parent->child_head, sibling_node) {
510 return device_get_device_tail(dev, 0, devp);
516 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
517 bool find_req_seq, struct udevice **devp)
522 if (seq_or_req_seq == -1)
525 list_for_each_entry(dev, &parent->child_head, sibling_node) {
526 if ((find_req_seq ? dev->req_seq : dev->seq) ==
536 int device_get_child_by_seq(struct udevice *parent, int seq,
537 struct udevice **devp)
543 ret = device_find_child_by_seq(parent, seq, false, &dev);
544 if (ret == -ENODEV) {
546 * We didn't find it in probed devices. See if there is one
547 * that will request this seq if probed.
549 ret = device_find_child_by_seq(parent, seq, true, &dev);
551 return device_get_device_tail(dev, ret, devp);
554 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
555 struct udevice **devp)
561 list_for_each_entry(dev, &parent->child_head, sibling_node) {
562 if (dev_of_offset(dev) == of_offset) {
571 int device_get_child_by_of_offset(struct udevice *parent, int node,
572 struct udevice **devp)
578 ret = device_find_child_by_of_offset(parent, node, &dev);
579 return device_get_device_tail(dev, ret, devp);
582 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
585 struct udevice *dev, *found;
587 if (dev_of_offset(parent) == of_offset)
590 list_for_each_entry(dev, &parent->child_head, sibling_node) {
591 found = _device_find_global_by_of_offset(dev, of_offset);
599 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
603 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
604 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
607 int device_find_first_child(struct udevice *parent, struct udevice **devp)
609 if (list_empty(&parent->child_head)) {
612 *devp = list_first_entry(&parent->child_head, struct udevice,
619 int device_find_next_child(struct udevice **devp)
621 struct udevice *dev = *devp;
622 struct udevice *parent = dev->parent;
624 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
627 *devp = list_entry(dev->sibling_node.next, struct udevice,
634 struct udevice *dev_get_parent(struct udevice *child)
636 return child->parent;
639 ulong dev_get_driver_data(struct udevice *dev)
641 return dev->driver_data;
644 const void *dev_get_driver_ops(struct udevice *dev)
646 if (!dev || !dev->driver->ops)
649 return dev->driver->ops;
652 enum uclass_id device_get_uclass_id(struct udevice *dev)
654 return dev->uclass->uc_drv->id;
657 const char *dev_get_uclass_name(struct udevice *dev)
662 return dev->uclass->uc_drv->name;
665 bool device_has_children(struct udevice *dev)
667 return !list_empty(&dev->child_head);
670 bool device_has_active_children(struct udevice *dev)
672 struct udevice *child;
674 for (device_find_first_child(dev, &child);
676 device_find_next_child(&child)) {
677 if (device_active(child))
684 bool device_is_last_sibling(struct udevice *dev)
686 struct udevice *parent = dev->parent;
690 return list_is_last(&dev->sibling_node, &parent->child_head);
693 void device_set_name_alloced(struct udevice *dev)
695 dev->flags |= DM_FLAG_NAME_ALLOCED;
698 int device_set_name(struct udevice *dev, const char *name)
704 device_set_name_alloced(dev);
709 bool device_is_compatible(struct udevice *dev, const char *compat)
711 return ofnode_device_is_compatible(dev_ofnode(dev), compat);
714 bool of_machine_is_compatible(const char *compat)
716 const void *fdt = gd->fdt_blob;
718 return !fdt_node_check_compatible(fdt, 0, compat);