1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
14 #include <linux/libfdt.h>
16 #include <dm/device.h>
17 #include <dm/device-internal.h>
20 #include <dm/of_access.h>
21 #include <dm/platdata.h>
24 #include <dm/uclass.h>
26 #include <linux/list.h>
28 DECLARE_GLOBAL_DATA_PTR;
30 static struct driver_info root_info = {
31 .name = "root_driver",
34 struct udevice *dm_root(void)
37 dm_warn("Virtual root driver does not exist!\n");
44 void dm_fixup_for_gd_move(struct global_data *new_gd)
46 /* The sentinel node has moved, so update things that point to it */
48 new_gd->uclass_root.next->prev = &new_gd->uclass_root;
49 new_gd->uclass_root.prev->next = &new_gd->uclass_root;
53 void fix_drivers(void)
56 ll_entry_start(struct driver, driver);
57 const int n_ents = ll_entry_count(struct driver, driver);
60 for (entry = drv; entry != drv + n_ents; entry++) {
62 entry->of_match = (const struct udevice_id *)
63 ((ulong)entry->of_match + gd->reloc_off);
65 entry->bind += gd->reloc_off;
67 entry->probe += gd->reloc_off;
69 entry->remove += gd->reloc_off;
71 entry->unbind += gd->reloc_off;
72 if (entry->ofdata_to_platdata)
73 entry->ofdata_to_platdata += gd->reloc_off;
74 if (entry->child_post_bind)
75 entry->child_post_bind += gd->reloc_off;
76 if (entry->child_pre_probe)
77 entry->child_pre_probe += gd->reloc_off;
78 if (entry->child_post_remove)
79 entry->child_post_remove += gd->reloc_off;
80 /* OPS are fixed in every uclass post_probe function */
82 entry->ops += gd->reloc_off;
88 struct uclass_driver *uclass =
89 ll_entry_start(struct uclass_driver, uclass);
90 const int n_ents = ll_entry_count(struct uclass_driver, uclass);
91 struct uclass_driver *entry;
93 for (entry = uclass; entry != uclass + n_ents; entry++) {
95 entry->post_bind += gd->reloc_off;
96 if (entry->pre_unbind)
97 entry->pre_unbind += gd->reloc_off;
99 entry->pre_probe += gd->reloc_off;
100 if (entry->post_probe)
101 entry->post_probe += gd->reloc_off;
102 if (entry->pre_remove)
103 entry->pre_remove += gd->reloc_off;
104 if (entry->child_post_bind)
105 entry->child_post_bind += gd->reloc_off;
106 if (entry->child_pre_probe)
107 entry->child_pre_probe += gd->reloc_off;
109 entry->init += gd->reloc_off;
111 entry->destroy += gd->reloc_off;
112 /* FIXME maybe also need to fix these ops */
114 entry->ops += gd->reloc_off;
118 void fix_devices(void)
120 struct driver_info *dev =
121 ll_entry_start(struct driver_info, driver_info);
122 const int n_ents = ll_entry_count(struct driver_info, driver_info);
123 struct driver_info *entry;
125 for (entry = dev; entry != dev + n_ents; entry++) {
127 entry->platdata += gd->reloc_off;
131 int dm_init(bool of_live)
136 dm_warn("Virtual root driver already exists!\n");
139 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
141 if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)) {
147 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
150 if (CONFIG_IS_ENABLED(OF_CONTROL))
151 DM_ROOT_NON_CONST->node = ofnode_root();
152 ret = device_probe(DM_ROOT_NON_CONST);
161 device_remove(dm_root(), DM_REMOVE_NORMAL);
162 device_unbind(dm_root());
168 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
169 int dm_remove_devices_flags(uint flags)
171 device_remove(dm_root(), flags);
177 int dm_scan_platdata(bool pre_reloc_only)
181 if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
182 struct driver_rt *dyn;
185 n_ents = ll_entry_count(struct driver_info, driver_info);
186 dyn = calloc(n_ents, sizeof(struct driver_rt));
189 gd_set_dm_driver_rt(dyn);
192 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
193 if (ret == -ENOENT) {
194 dm_warn("Some drivers were not found\n");
201 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
203 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
205 * This scans the subnodes of a device tree node and and creates a driver
208 * @parent: Parent device for the devices that will be created
209 * @node: Node to scan
210 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
211 * flag. If false bind all drivers.
212 * @return 0 if OK, -ve on error
214 static int dm_scan_fdt_node(struct udevice *parent, ofnode parent_node,
220 if (!ofnode_valid(parent_node))
223 for (node = ofnode_first_subnode(parent_node);
225 node = ofnode_next_subnode(node)) {
226 const char *node_name = ofnode_get_name(node);
228 if (!ofnode_is_enabled(node)) {
229 pr_debug(" - ignoring disabled device\n");
232 err = lists_bind_fdt(parent, node, NULL, pre_reloc_only);
235 debug("%s: ret=%d\n", node_name, ret);
240 dm_warn("Some drivers failed to bind\n");
245 int dm_scan_fdt_dev(struct udevice *dev)
247 return dm_scan_fdt_node(dev, dev_ofnode(dev),
248 gd->flags & GD_FLG_RELOC ? false : true);
251 int dm_scan_fdt(bool pre_reloc_only)
253 return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
256 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
260 node = ofnode_path(path);
262 return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
265 int dm_extended_scan(bool pre_reloc_only)
268 const char * const nodes[] = {
274 ret = dm_scan_fdt(pre_reloc_only);
276 debug("dm_scan_fdt() failed: %d\n", ret);
280 /* Some nodes aren't devices themselves but may contain some */
281 for (i = 0; i < ARRAY_SIZE(nodes); i++) {
282 ret = dm_scan_fdt_ofnode_path(nodes[i], pre_reloc_only);
284 debug("dm_scan_fdt() scan for %s failed: %d\n",
294 __weak int dm_scan_other(bool pre_reloc_only)
299 int dm_init_and_scan(bool pre_reloc_only)
303 if (CONFIG_IS_ENABLED(OF_PLATDATA))
304 dm_populate_phandle_data();
306 ret = dm_init(CONFIG_IS_ENABLED(OF_LIVE));
308 debug("dm_init() failed: %d\n", ret);
311 ret = dm_scan_platdata(pre_reloc_only);
313 debug("dm_scan_platdata() failed: %d\n", ret);
317 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
318 ret = dm_extended_scan(pre_reloc_only);
320 debug("dm_extended_scan() failed: %d\n", ret);
325 ret = dm_scan_other(pre_reloc_only);
332 #ifdef CONFIG_ACPIGEN
333 static int root_acpi_get_name(const struct udevice *dev, char *out_name)
335 return acpi_copy_name(out_name, "\\_SB");
338 struct acpi_ops root_acpi_ops = {
339 .get_name = root_acpi_get_name,
343 /* This is the root driver - all drivers are children of this */
344 U_BOOT_DRIVER(root_driver) = {
345 .name = "root_driver",
347 ACPI_OPS_PTR(&root_acpi_ops)
350 /* This is the root uclass */
351 UCLASS_DRIVER(root) = {