4 * Copyright (c) 2013 Google, Inc
9 * SPDX-License-Identifier: GPL-2.0+
14 #include <fdt_support.h>
16 #include <dm/device.h>
17 #include <dm/device-internal.h>
19 #include <dm/pinctrl.h>
20 #include <dm/platdata.h>
21 #include <dm/uclass.h>
22 #include <dm/uclass-internal.h>
24 #include <linux/err.h>
25 #include <linux/list.h>
27 DECLARE_GLOBAL_DATA_PTR;
29 int device_bind(struct udevice *parent, const struct driver *drv,
30 const char *name, void *platdata, int of_offset,
31 struct udevice **devp)
42 ret = uclass_get(drv->id, &uc);
44 debug("Missing uclass for driver %s\n", drv->name);
48 dev = calloc(1, sizeof(struct udevice));
52 INIT_LIST_HEAD(&dev->sibling_node);
53 INIT_LIST_HEAD(&dev->child_head);
54 INIT_LIST_HEAD(&dev->uclass_node);
56 INIT_LIST_HEAD(&dev->devres_head);
58 dev->platdata = platdata;
60 dev->of_offset = of_offset;
67 if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
69 * Some devices, such as a SPI bus, I2C bus and serial ports
70 * are numbered using aliases.
72 * This is just a 'requested' sequence, and will be
73 * resolved (and ->seq updated) when the device is probed.
75 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
76 if (uc->uc_drv->name && of_offset != -1) {
77 fdtdec_get_alias_seq(gd->fdt_blob,
78 uc->uc_drv->name, of_offset,
84 if (!dev->platdata && drv->platdata_auto_alloc_size) {
85 dev->flags |= DM_FLAG_ALLOC_PDATA;
86 dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
93 size = uc->uc_drv->per_device_platdata_auto_alloc_size;
95 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
96 dev->uclass_platdata = calloc(1, size);
97 if (!dev->uclass_platdata) {
104 size = parent->driver->per_child_platdata_auto_alloc_size;
106 size = parent->uclass->uc_drv->
107 per_child_platdata_auto_alloc_size;
110 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
111 dev->parent_platdata = calloc(1, size);
112 if (!dev->parent_platdata) {
119 /* put dev into parent's successor list */
121 list_add_tail(&dev->sibling_node, &parent->child_head);
123 ret = uclass_bind_device(dev);
125 goto fail_uclass_bind;
127 /* if we fail to bind we remove device from successors and free it */
129 ret = drv->bind(dev);
133 if (parent && parent->driver->child_post_bind) {
134 ret = parent->driver->child_post_bind(dev);
136 goto fail_child_post_bind;
140 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
144 dev->flags |= DM_FLAG_BOUND;
148 fail_child_post_bind:
149 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
150 if (drv->unbind && drv->unbind(dev)) {
151 dm_warn("unbind() method failed on dev '%s' on error path\n",
157 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
158 if (uclass_unbind_device(dev)) {
159 dm_warn("Failed to unbind dev '%s' on error path\n",
164 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
165 list_del(&dev->sibling_node);
166 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
167 free(dev->parent_platdata);
168 dev->parent_platdata = NULL;
172 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
173 free(dev->uclass_platdata);
174 dev->uclass_platdata = NULL;
177 if (dev->flags & DM_FLAG_ALLOC_PDATA) {
179 dev->platdata = NULL;
182 devres_release_all(dev);
189 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
190 const struct driver_info *info, struct udevice **devp)
194 drv = lists_driver_lookup_name(info->name);
197 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
200 return device_bind(parent, drv, info->name, (void *)info->platdata,
204 static void *alloc_priv(int size, uint flags)
208 if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
209 priv = memalign(ARCH_DMA_MINALIGN, size);
211 memset(priv, '\0', size);
213 priv = calloc(1, size);
219 int device_probe_child(struct udevice *dev, void *parent_priv)
221 const struct driver *drv;
229 if (dev->flags & DM_FLAG_ACTIVATED)
235 /* Allocate private data if requested and not reentered */
236 if (drv->priv_auto_alloc_size && !dev->priv) {
237 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
243 /* Allocate private data if requested and not reentered */
244 size = dev->uclass->uc_drv->per_device_auto_alloc_size;
245 if (size && !dev->uclass_priv) {
246 dev->uclass_priv = calloc(1, size);
247 if (!dev->uclass_priv) {
253 /* Ensure all parents are probed */
255 size = dev->parent->driver->per_child_auto_alloc_size;
257 size = dev->parent->uclass->uc_drv->
258 per_child_auto_alloc_size;
260 if (size && !dev->parent_priv) {
261 dev->parent_priv = alloc_priv(size, drv->flags);
262 if (!dev->parent_priv) {
267 memcpy(dev->parent_priv, parent_priv, size);
270 ret = device_probe(dev->parent);
275 * The device might have already been probed during
276 * the call to device_probe() on its parent device
277 * (e.g. PCI bridge devices). Test the flags again
278 * so that we don't mess up the device.
280 if (dev->flags & DM_FLAG_ACTIVATED)
284 seq = uclass_resolve_seq(dev);
291 dev->flags |= DM_FLAG_ACTIVATED;
294 * Process pinctrl for everything except the root device, and
295 * continue regardless of the result of pinctrl.
298 pinctrl_select_state(dev, "default");
300 ret = uclass_pre_probe_device(dev);
304 if (dev->parent && dev->parent->driver->child_pre_probe) {
305 ret = dev->parent->driver->child_pre_probe(dev);
310 if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
311 ret = drv->ofdata_to_platdata(dev);
317 ret = drv->probe(dev);
319 dev->flags &= ~DM_FLAG_ACTIVATED;
324 ret = uclass_post_probe_device(dev);
330 if (device_remove(dev)) {
331 dm_warn("%s: Device '%s' failed to remove on error path\n",
332 __func__, dev->name);
335 dev->flags &= ~DM_FLAG_ACTIVATED;
343 int device_probe(struct udevice *dev)
345 return device_probe_child(dev, NULL);
348 void *dev_get_platdata(struct udevice *dev)
351 dm_warn("%s: null device\n", __func__);
355 return dev->platdata;
358 void *dev_get_parent_platdata(struct udevice *dev)
361 dm_warn("%s: null device\n", __func__);
365 return dev->parent_platdata;
368 void *dev_get_uclass_platdata(struct udevice *dev)
371 dm_warn("%s: null device\n", __func__);
375 return dev->uclass_platdata;
378 void *dev_get_priv(struct udevice *dev)
381 dm_warn("%s: null device\n", __func__);
388 void *dev_get_uclass_priv(struct udevice *dev)
391 dm_warn("%s: null device\n", __func__);
395 return dev->uclass_priv;
398 void *dev_get_parent_priv(struct udevice *dev)
401 dm_warn("%s: null device\n", __func__);
405 return dev->parent_priv;
408 static int device_get_device_tail(struct udevice *dev, int ret,
409 struct udevice **devp)
414 ret = device_probe(dev);
423 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
427 list_for_each_entry(dev, &parent->child_head, sibling_node) {
429 return device_get_device_tail(dev, 0, devp);
435 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
436 bool find_req_seq, struct udevice **devp)
441 if (seq_or_req_seq == -1)
444 list_for_each_entry(dev, &parent->child_head, sibling_node) {
445 if ((find_req_seq ? dev->req_seq : dev->seq) ==
455 int device_get_child_by_seq(struct udevice *parent, int seq,
456 struct udevice **devp)
462 ret = device_find_child_by_seq(parent, seq, false, &dev);
463 if (ret == -ENODEV) {
465 * We didn't find it in probed devices. See if there is one
466 * that will request this seq if probed.
468 ret = device_find_child_by_seq(parent, seq, true, &dev);
470 return device_get_device_tail(dev, ret, devp);
473 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
474 struct udevice **devp)
480 list_for_each_entry(dev, &parent->child_head, sibling_node) {
481 if (dev->of_offset == of_offset) {
490 int device_get_child_by_of_offset(struct udevice *parent, int node,
491 struct udevice **devp)
497 ret = device_find_child_by_of_offset(parent, node, &dev);
498 return device_get_device_tail(dev, ret, devp);
501 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
504 struct udevice *dev, *found;
506 if (parent->of_offset == of_offset)
509 list_for_each_entry(dev, &parent->child_head, sibling_node) {
510 found = _device_find_global_by_of_offset(dev, of_offset);
518 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
522 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
523 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
526 int device_find_first_child(struct udevice *parent, struct udevice **devp)
528 if (list_empty(&parent->child_head)) {
531 *devp = list_first_entry(&parent->child_head, struct udevice,
538 int device_find_next_child(struct udevice **devp)
540 struct udevice *dev = *devp;
541 struct udevice *parent = dev->parent;
543 if (list_is_last(&dev->sibling_node, &parent->child_head)) {
546 *devp = list_entry(dev->sibling_node.next, struct udevice,
553 struct udevice *dev_get_parent(struct udevice *child)
555 return child->parent;
558 ulong dev_get_driver_data(struct udevice *dev)
560 return dev->driver_data;
563 const void *dev_get_driver_ops(struct udevice *dev)
565 if (!dev || !dev->driver->ops)
568 return dev->driver->ops;
571 enum uclass_id device_get_uclass_id(struct udevice *dev)
573 return dev->uclass->uc_drv->id;
576 const char *dev_get_uclass_name(struct udevice *dev)
581 return dev->uclass->uc_drv->name;
584 fdt_addr_t dev_get_addr_index(struct udevice *dev, int index)
586 #if CONFIG_IS_ENABLED(OF_CONTROL)
589 if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
594 na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
596 debug("bad #address-cells\n");
597 return FDT_ADDR_T_NONE;
600 ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
602 debug("bad #size-cells\n");
603 return FDT_ADDR_T_NONE;
606 reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len);
607 if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
608 debug("Req index out of range\n");
609 return FDT_ADDR_T_NONE;
612 reg += index * (na + ns);
615 * Use the full-fledged translate function for complex
618 addr = fdt_translate_address((void *)gd->fdt_blob,
619 dev->of_offset, reg);
622 * Use the "simple" translate function for less complex
625 addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
626 dev->parent->of_offset,
627 dev->of_offset, "reg",
629 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
630 if (device_get_uclass_id(dev->parent) ==
632 addr = simple_bus_translate(dev->parent, addr);
637 * Some platforms need a special address translation. Those
638 * platforms (e.g. mvebu in SPL) can configure a translation
639 * offset in the DM by calling dm_set_translation_offset() that
640 * will get added to all addresses returned by dev_get_addr().
642 addr += dm_get_translation_offset();
646 return FDT_ADDR_T_NONE;
650 fdt_addr_t dev_get_addr(struct udevice *dev)
652 return dev_get_addr_index(dev, 0);
655 bool device_has_children(struct udevice *dev)
657 return !list_empty(&dev->child_head);
660 bool device_has_active_children(struct udevice *dev)
662 struct udevice *child;
664 for (device_find_first_child(dev, &child);
666 device_find_next_child(&child)) {
667 if (device_active(child))
674 bool device_is_last_sibling(struct udevice *dev)
676 struct udevice *parent = dev->parent;
680 return list_is_last(&dev->sibling_node, &parent->child_head);
683 int device_set_name(struct udevice *dev, const char *name)