1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
13 #include <linux/libfdt.h>
14 #include <dm/device.h>
15 #include <dm/device-internal.h>
18 #include <dm/of_access.h>
19 #include <dm/platdata.h>
22 #include <dm/uclass.h>
24 #include <linux/list.h>
26 DECLARE_GLOBAL_DATA_PTR;
28 static const struct driver_info root_info = {
29 .name = "root_driver",
32 struct udevice *dm_root(void)
35 dm_warn("Virtual root driver does not exist!\n");
42 void dm_fixup_for_gd_move(struct global_data *new_gd)
44 /* The sentinel node has moved, so update things that point to it */
46 new_gd->uclass_root.next->prev = &new_gd->uclass_root;
47 new_gd->uclass_root.prev->next = &new_gd->uclass_root;
51 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
52 void fix_drivers(void)
55 ll_entry_start(struct driver, driver);
56 const int n_ents = ll_entry_count(struct driver, driver);
59 for (entry = drv; entry != drv + n_ents; entry++) {
61 entry->of_match = (const struct udevice_id *)
62 ((u32)entry->of_match + gd->reloc_off);
64 entry->bind += gd->reloc_off;
66 entry->probe += gd->reloc_off;
68 entry->remove += gd->reloc_off;
70 entry->unbind += gd->reloc_off;
71 if (entry->ofdata_to_platdata)
72 entry->ofdata_to_platdata += gd->reloc_off;
73 if (entry->child_post_bind)
74 entry->child_post_bind += gd->reloc_off;
75 if (entry->child_pre_probe)
76 entry->child_pre_probe += gd->reloc_off;
77 if (entry->child_post_remove)
78 entry->child_post_remove += gd->reloc_off;
79 /* OPS are fixed in every uclass post_probe function */
81 entry->ops += gd->reloc_off;
87 struct uclass_driver *uclass =
88 ll_entry_start(struct uclass_driver, uclass);
89 const int n_ents = ll_entry_count(struct uclass_driver, uclass);
90 struct uclass_driver *entry;
92 for (entry = uclass; entry != uclass + n_ents; entry++) {
94 entry->post_bind += gd->reloc_off;
95 if (entry->pre_unbind)
96 entry->pre_unbind += gd->reloc_off;
98 entry->pre_probe += gd->reloc_off;
99 if (entry->post_probe)
100 entry->post_probe += gd->reloc_off;
101 if (entry->pre_remove)
102 entry->pre_remove += gd->reloc_off;
103 if (entry->child_post_bind)
104 entry->child_post_bind += gd->reloc_off;
105 if (entry->child_pre_probe)
106 entry->child_pre_probe += gd->reloc_off;
108 entry->init += gd->reloc_off;
110 entry->destroy += gd->reloc_off;
111 /* FIXME maybe also need to fix these ops */
113 entry->ops += gd->reloc_off;
117 void fix_devices(void)
119 struct driver_info *dev =
120 ll_entry_start(struct driver_info, driver_info);
121 const int n_ents = ll_entry_count(struct driver_info, driver_info);
122 struct driver_info *entry;
124 for (entry = dev; entry != dev + n_ents; entry++) {
126 entry->platdata += gd->reloc_off;
132 int dm_init(bool of_live)
137 dm_warn("Virtual root driver already exists!\n");
140 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
142 #if defined(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 # if CONFIG_IS_ENABLED(OF_LIVE)
154 DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
157 DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
159 ret = device_probe(DM_ROOT_NON_CONST);
168 device_remove(dm_root(), DM_REMOVE_NORMAL);
169 device_unbind(dm_root());
175 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
176 int dm_remove_devices_flags(uint flags)
178 device_remove(dm_root(), flags);
184 int dm_scan_platdata(bool pre_reloc_only)
188 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
189 if (ret == -ENOENT) {
190 dm_warn("Some drivers were not found\n");
197 #if CONFIG_IS_ENABLED(OF_LIVE)
198 static int dm_scan_fdt_live(struct udevice *parent,
199 const struct device_node *node_parent,
202 struct device_node *np;
205 for (np = node_parent->child; np; np = np->sibling) {
206 /* "chosen" node isn't a device itself but may contain some: */
207 if (!strcmp(np->name, "chosen")) {
208 pr_debug("parsing subnodes of \"chosen\"\n");
210 err = dm_scan_fdt_live(parent, np, pre_reloc_only);
216 if (!of_device_is_available(np)) {
217 pr_debug(" - ignoring disabled device\n");
220 err = lists_bind_fdt(parent, np_to_ofnode(np), NULL,
224 debug("%s: ret=%d\n", np->name, ret);
229 dm_warn("Some drivers failed to bind\n");
233 #endif /* CONFIG_IS_ENABLED(OF_LIVE) */
235 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
237 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
239 * This scans the subnodes of a device tree node and and creates a driver
242 * @parent: Parent device for the devices that will be created
243 * @blob: Pointer to device tree blob
244 * @offset: Offset of node to scan
245 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
246 * flag. If false bind all drivers.
247 * @return 0 if OK, -ve on error
249 static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
250 int offset, bool pre_reloc_only)
254 for (offset = fdt_first_subnode(blob, offset);
256 offset = fdt_next_subnode(blob, offset)) {
257 const char *node_name = fdt_get_name(blob, offset, NULL);
260 * The "chosen" and "firmware" nodes aren't devices
261 * themselves but may contain some:
263 if (!strcmp(node_name, "chosen") ||
264 !strcmp(node_name, "firmware")) {
265 pr_debug("parsing subnodes of \"%s\"\n", node_name);
267 err = dm_scan_fdt_node(parent, blob, offset,
274 if (!fdtdec_get_is_enabled(blob, offset)) {
275 pr_debug(" - ignoring disabled device\n");
278 err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL,
282 debug("%s: ret=%d\n", node_name, ret);
287 dm_warn("Some drivers failed to bind\n");
292 int dm_scan_fdt_dev(struct udevice *dev)
294 if (!dev_of_valid(dev))
297 #if CONFIG_IS_ENABLED(OF_LIVE)
298 if (of_live_active())
299 return dm_scan_fdt_live(dev, dev_np(dev),
300 gd->flags & GD_FLG_RELOC ? false : true);
303 return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
304 gd->flags & GD_FLG_RELOC ? false : true);
307 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
309 #if CONFIG_IS_ENABLED(OF_LIVE)
310 if (of_live_active())
311 return dm_scan_fdt_live(gd->dm_root, gd->of_root,
315 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
318 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
322 node = ofnode_path(path);
323 if (!ofnode_valid(node))
326 #if CONFIG_IS_ENABLED(OF_LIVE)
327 if (of_live_active())
328 return dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only);
330 return dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset,
334 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
338 ret = dm_scan_fdt(blob, pre_reloc_only);
340 debug("dm_scan_fdt() failed: %d\n", ret);
344 ret = dm_scan_fdt_ofnode_path("/clocks", pre_reloc_only);
346 debug("scan for /clocks failed: %d\n", ret);
350 ret = dm_scan_fdt_ofnode_path("/firmware", pre_reloc_only);
352 debug("scan for /firmware failed: %d\n", ret);
358 __weak int dm_scan_other(bool pre_reloc_only)
363 int dm_init_and_scan(bool pre_reloc_only)
367 ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
369 debug("dm_init() failed: %d\n", ret);
372 ret = dm_scan_platdata(pre_reloc_only);
374 debug("dm_scan_platdata() failed: %d\n", ret);
378 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
379 ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
381 debug("dm_extended_scan_dt() failed: %d\n", ret);
386 ret = dm_scan_other(pre_reloc_only);
393 /* This is the root driver - all drivers are children of this */
394 U_BOOT_DRIVER(root_driver) = {
395 .name = "root_driver",
399 /* This is the root uclass */
400 UCLASS_DRIVER(root) = {