1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
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->of_to_plat)
73 entry->of_to_plat += 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_driver);
90 const int n_ents = ll_entry_count(struct uclass_driver, uclass_driver);
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->plat += gd->reloc_off;
131 int dm_init(bool of_live)
136 dm_warn("Virtual root driver already exists!\n");
139 gd->uclass_root = &DM_UCLASS_ROOT_S_NON_CONST;
140 INIT_LIST_HEAD(DM_UCLASS_ROOT_NON_CONST);
142 if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)) {
148 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
151 if (CONFIG_IS_ENABLED(OF_CONTROL))
152 dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
153 ret = device_probe(DM_ROOT_NON_CONST);
162 device_remove(dm_root(), DM_REMOVE_NORMAL);
163 device_unbind(dm_root());
169 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
170 int dm_remove_devices_flags(uint flags)
172 device_remove(dm_root(), flags);
178 int dm_scan_plat(bool pre_reloc_only)
182 if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
183 struct driver_rt *dyn;
186 n_ents = ll_entry_count(struct driver_info, driver_info);
187 dyn = calloc(n_ents, sizeof(struct driver_rt));
190 gd_set_dm_driver_rt(dyn);
193 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
194 if (ret == -ENOENT) {
195 dm_warn("Some drivers were not found\n");
202 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
204 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
206 * This scans the subnodes of a device tree node and and creates a driver
209 * @parent: Parent device for the devices that will be created
210 * @node: Node to scan
211 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
212 * flag. If false bind all drivers.
213 * @return 0 if OK, -ve on error
215 static int dm_scan_fdt_node(struct udevice *parent, ofnode parent_node,
221 if (!ofnode_valid(parent_node))
224 for (node = ofnode_first_subnode(parent_node);
226 node = ofnode_next_subnode(node)) {
227 const char *node_name = ofnode_get_name(node);
229 if (!ofnode_is_enabled(node)) {
230 pr_debug(" - ignoring disabled device\n");
233 err = lists_bind_fdt(parent, node, NULL, pre_reloc_only);
236 debug("%s: ret=%d\n", node_name, ret);
241 dm_warn("Some drivers failed to bind\n");
246 int dm_scan_fdt_dev(struct udevice *dev)
248 return dm_scan_fdt_node(dev, dev_ofnode(dev),
249 gd->flags & GD_FLG_RELOC ? false : true);
252 int dm_scan_fdt(bool pre_reloc_only)
254 return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
257 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
261 node = ofnode_path(path);
263 return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
266 int dm_extended_scan(bool pre_reloc_only)
269 const char * const nodes[] = {
275 ret = dm_scan_fdt(pre_reloc_only);
277 debug("dm_scan_fdt() failed: %d\n", ret);
281 /* Some nodes aren't devices themselves but may contain some */
282 for (i = 0; i < ARRAY_SIZE(nodes); i++) {
283 ret = dm_scan_fdt_ofnode_path(nodes[i], pre_reloc_only);
285 debug("dm_scan_fdt() scan for %s failed: %d\n",
295 __weak int dm_scan_other(bool pre_reloc_only)
301 * dm_scan() - Scan tables to bind devices
303 * Runs through the driver_info tables and binds the devices it finds. Then runs
304 * through the devicetree nodes. Finally calls dm_scan_other() to add any
307 * @pre_reloc_only: If true, bind only nodes with special devicetree properties,
308 * or drivers with the DM_FLAG_PRE_RELOC flag. If false bind all drivers.
310 static int dm_scan(bool pre_reloc_only)
314 ret = dm_scan_plat(pre_reloc_only);
316 debug("dm_scan_plat() failed: %d\n", ret);
320 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
321 ret = dm_extended_scan(pre_reloc_only);
323 debug("dm_extended_scan() failed: %d\n", ret);
328 ret = dm_scan_other(pre_reloc_only);
335 int dm_init_and_scan(bool pre_reloc_only)
339 ret = dm_init(CONFIG_IS_ENABLED(OF_LIVE));
341 debug("dm_init() failed: %d\n", ret);
344 ret = dm_scan(pre_reloc_only);
346 log_debug("dm_scan() failed: %d\n", ret);
353 #ifdef CONFIG_ACPIGEN
354 static int root_acpi_get_name(const struct udevice *dev, char *out_name)
356 return acpi_copy_name(out_name, "\\_SB");
359 struct acpi_ops root_acpi_ops = {
360 .get_name = root_acpi_get_name,
364 /* This is the root driver - all drivers are children of this */
365 U_BOOT_DRIVER(root_driver) = {
366 .name = "root_driver",
368 ACPI_OPS_PTR(&root_acpi_ops)
371 /* This is the root uclass */
372 UCLASS_DRIVER(root) = {