4 * Copyright (c) 2013 Google, Inc
7 * Pavel Herrmann <morpheus.ibis@gmail.com>
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>
22 #include <dm/uclass.h>
23 #include <dm/uclass-internal.h>
25 #include <linux/err.h>
26 #include <linux/list.h>
28 DECLARE_GLOBAL_DATA_PTR;
30 static int device_bind_common(struct udevice *parent, const struct driver *drv,
31 const char *name, void *platdata,
32 ulong driver_data, int of_offset,
33 uint of_platdata_size, struct udevice **devp)
44 ret = uclass_get(drv->id, &uc);
46 debug("Missing uclass for driver %s\n", drv->name);
50 dev = calloc(1, sizeof(struct udevice));
54 INIT_LIST_HEAD(&dev->sibling_node);
55 INIT_LIST_HEAD(&dev->child_head);
56 INIT_LIST_HEAD(&dev->uclass_node);
58 INIT_LIST_HEAD(&dev->devres_head);
60 dev->platdata = platdata;
61 dev->driver_data = driver_data;
63 dev->node = offset_to_ofnode(of_offset);
70 if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
72 * Some devices, such as a SPI bus, I2C bus and serial ports
73 * are numbered using aliases.
75 * This is just a 'requested' sequence, and will be
76 * resolved (and ->seq updated) when the device is probed.
78 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
79 if (uc->uc_drv->name && of_offset != -1) {
80 fdtdec_get_alias_seq(gd->fdt_blob,
81 uc->uc_drv->name, of_offset,
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 dm_dbg("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, int of_offset,
219 struct udevice **devp)
221 return device_bind_common(parent, drv, name, NULL, driver_data,
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, of_offset, 0,
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, -1, platdata_size, devp);
252 static void *alloc_priv(int size, uint flags)
256 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
257 priv = memalign(ARCH_DMA_MINALIGN, size);
259 memset(priv, '\0', size);
262 * Ensure that the zero bytes are flushed to memory.
263 * This prevents problems if the driver uses this as
264 * both an input and an output buffer:
266 * 1. Zeroes written to buffer (here) and sit in the
268 * 2. Driver issues a read command to DMA
269 * 3. CPU runs out of cache space and evicts some cache
270 * data in the buffer, writing zeroes to RAM from
273 * 5. Buffer now has some DMA data and some zeroes
274 * 6. Data being read is now incorrect
276 * To prevent this, ensure that the cache is clean
277 * within this range at the start. The driver can then
278 * use normal flush-after-write, invalidate-before-read
281 * TODO(sjg@chromium.org): Drop this microblaze
284 #ifndef CONFIG_MICROBLAZE
285 flush_dcache_range((ulong)priv, (ulong)priv + size);
289 priv = calloc(1, size);
295 int device_probe(struct udevice *dev)
297 const struct driver *drv;
305 if (dev->flags & DM_FLAG_ACTIVATED)
311 /* Allocate private data if requested and not reentered */
312 if (drv->priv_auto_alloc_size && !dev->priv) {
313 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
319 /* Allocate private data if requested and not reentered */
320 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
321 if (size && !dev->uclass_priv) {
322 dev->uclass_priv = calloc(1, size);
323 if (!dev->uclass_priv) {
329 /* Ensure all parents are probed */
331 size = dev->parent->driver->per_child_auto_alloc_size;
333 size = dev->parent->uclass->uc_drv->
334 per_child_auto_alloc_size;
336 if (size && !dev->parent_priv) {
337 dev->parent_priv = alloc_priv(size, drv->flags);
338 if (!dev->parent_priv) {
344 ret = device_probe(dev->parent);
349 * The device might have already been probed during
350 * the call to device_probe() on its parent device
351 * (e.g. PCI bridge devices). Test the flags again
352 * so that we don't mess up the device.
354 if (dev->flags & DM_FLAG_ACTIVATED)
358 seq = uclass_resolve_seq(dev);
365 dev->flags |= DM_FLAG_ACTIVATED;
368 * Process pinctrl for everything except the root device, and
369 * continue regardless of the result of pinctrl. Don't process pinctrl
370 * settings for pinctrl devices since the device may not yet be
373 if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
374 pinctrl_select_state(dev, "default");
376 ret = uclass_pre_probe_device(dev);
380 if (dev->parent && dev->parent->driver->child_pre_probe) {
381 ret = dev->parent->driver->child_pre_probe(dev);
386 if (drv->ofdata_to_platdata && dev_of_offset(dev) >= 0) {
387 ret = drv->ofdata_to_platdata(dev);
393 ret = drv->probe(dev);
395 dev->flags &= ~DM_FLAG_ACTIVATED;
400 ret = uclass_post_probe_device(dev);
404 if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
405 pinctrl_select_state(dev, "default");
409 if (device_remove(dev, DM_REMOVE_NORMAL)) {
410 dm_warn("%s: Device '%s' failed to remove on error path\n",
411 __func__, dev->name);
414 dev->flags &= ~DM_FLAG_ACTIVATED;
422 void *dev_get_platdata(struct udevice *dev)
425 dm_warn("%s: null device\n", __func__);
429 return dev->platdata;
432 void *dev_get_parent_platdata(struct udevice *dev)
435 dm_warn("%s: null device\n", __func__);
439 return dev->parent_platdata;
442 void *dev_get_uclass_platdata(struct udevice *dev)
445 dm_warn("%s: null device\n", __func__);
449 return dev->uclass_platdata;
452 void *dev_get_priv(struct udevice *dev)
455 dm_warn("%s: null device\n", __func__);
462 void *dev_get_uclass_priv(struct udevice *dev)
465 dm_warn("%s: null device\n", __func__);
469 return dev->uclass_priv;
472 void *dev_get_parent_priv(struct udevice *dev)
475 dm_warn("%s: null device\n", __func__);
479 return dev->parent_priv;
482 static int device_get_device_tail(struct udevice *dev, int ret,
483 struct udevice **devp)
488 ret = device_probe(dev);
497 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
501 list_for_each_entry(dev, &parent->child_head, sibling_node) {
503 return device_get_device_tail(dev, 0, devp);
509 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
510 bool find_req_seq, struct udevice **devp)
515 if (seq_or_req_seq == -1)
518 list_for_each_entry(dev, &parent->child_head, sibling_node) {
519 if ((find_req_seq ? dev->req_seq : dev->seq) ==
529 int device_get_child_by_seq(struct udevice *parent, int seq,
530 struct udevice **devp)
536 ret = device_find_child_by_seq(parent, seq, false, &dev);
537 if (ret == -ENODEV) {
539 * We didn't find it in probed devices. See if there is one
540 * that will request this seq if probed.
542 ret = device_find_child_by_seq(parent, seq, true, &dev);
544 return device_get_device_tail(dev, ret, devp);
547 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
548 struct udevice **devp)
554 list_for_each_entry(dev, &parent->child_head, sibling_node) {
555 if (dev_of_offset(dev) == of_offset) {
564 int device_get_child_by_of_offset(struct udevice *parent, int node,
565 struct udevice **devp)
571 ret = device_find_child_by_of_offset(parent, node, &dev);
572 return device_get_device_tail(dev, ret, devp);
575 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
578 struct udevice *dev, *found;
580 if (dev_of_offset(parent) == of_offset)
583 list_for_each_entry(dev, &parent->child_head, sibling_node) {
584 found = _device_find_global_by_of_offset(dev, of_offset);
592 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
596 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
597 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
600 int device_find_first_child(struct udevice *parent, struct udevice **devp)
602 if (list_empty(&parent->child_head)) {
605 *devp = list_first_entry(&parent->child_head, struct udevice,
612 int device_find_next_child(struct udevice **devp)
614 struct udevice *dev = *devp;
615 struct udevice *parent = dev->parent;
617 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
620 *devp = list_entry(dev->sibling_node.next, struct udevice,
627 struct udevice *dev_get_parent(struct udevice *child)
629 return child->parent;
632 ulong dev_get_driver_data(struct udevice *dev)
634 return dev->driver_data;
637 const void *dev_get_driver_ops(struct udevice *dev)
639 if (!dev || !dev->driver->ops)
642 return dev->driver->ops;
645 enum uclass_id device_get_uclass_id(struct udevice *dev)
647 return dev->uclass->uc_drv->id;
650 const char *dev_get_uclass_name(struct udevice *dev)
655 return dev->uclass->uc_drv->name;
658 bool device_has_children(struct udevice *dev)
660 return !list_empty(&dev->child_head);
663 bool device_has_active_children(struct udevice *dev)
665 struct udevice *child;
667 for (device_find_first_child(dev, &child);
669 device_find_next_child(&child)) {
670 if (device_active(child))
677 bool device_is_last_sibling(struct udevice *dev)
679 struct udevice *parent = dev->parent;
683 return list_is_last(&dev->sibling_node, &parent->child_head);
686 void device_set_name_alloced(struct udevice *dev)
688 dev->flags |= DM_FLAG_NAME_ALLOCED;
691 int device_set_name(struct udevice *dev, const char *name)
697 device_set_name_alloced(dev);
702 bool of_device_is_compatible(struct udevice *dev, const char *compat)
704 const void *fdt = gd->fdt_blob;
706 return !fdt_node_check_compatible(fdt, dev_of_offset(dev), compat);
709 bool of_machine_is_compatible(const char *compat)
711 const void *fdt = gd->fdt_blob;
713 return !fdt_node_check_compatible(fdt, 0, compat);