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;
29 fdt_addr_t translation_offset; /* optional translation offset */
32 static const struct driver_info root_info = {
33 .name = "root_driver",
36 struct udevice *dm_root(void)
39 dm_warn("Virtual root driver does not exist!\n");
46 void dm_fixup_for_gd_move(struct global_data *new_gd)
48 /* The sentinel node has moved, so update things that point to it */
50 new_gd->uclass_root.next->prev = &new_gd->uclass_root;
51 new_gd->uclass_root.prev->next = &new_gd->uclass_root;
55 fdt_addr_t dm_get_translation_offset(void)
57 struct udevice *root = dm_root();
58 struct root_priv *priv = dev_get_priv(root);
60 return priv->translation_offset;
63 void dm_set_translation_offset(fdt_addr_t offs)
65 struct udevice *root = dm_root();
66 struct root_priv *priv = dev_get_priv(root);
68 priv->translation_offset = offs;
71 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
72 void fix_drivers(void)
75 ll_entry_start(struct driver, driver);
76 const int n_ents = ll_entry_count(struct driver, driver);
79 for (entry = drv; entry != drv + n_ents; entry++) {
81 entry->of_match = (const struct udevice_id *)
82 ((u32)entry->of_match + gd->reloc_off);
84 entry->bind += gd->reloc_off;
86 entry->probe += gd->reloc_off;
88 entry->remove += gd->reloc_off;
90 entry->unbind += gd->reloc_off;
91 if (entry->ofdata_to_platdata)
92 entry->ofdata_to_platdata += gd->reloc_off;
93 if (entry->child_post_bind)
94 entry->child_post_bind += gd->reloc_off;
95 if (entry->child_pre_probe)
96 entry->child_pre_probe += gd->reloc_off;
97 if (entry->child_post_remove)
98 entry->child_post_remove += gd->reloc_off;
99 /* OPS are fixed in every uclass post_probe function */
101 entry->ops += gd->reloc_off;
105 void fix_uclass(void)
107 struct uclass_driver *uclass =
108 ll_entry_start(struct uclass_driver, uclass);
109 const int n_ents = ll_entry_count(struct uclass_driver, uclass);
110 struct uclass_driver *entry;
112 for (entry = uclass; entry != uclass + n_ents; entry++) {
113 if (entry->post_bind)
114 entry->post_bind += gd->reloc_off;
115 if (entry->pre_unbind)
116 entry->pre_unbind += gd->reloc_off;
117 if (entry->pre_probe)
118 entry->pre_probe += gd->reloc_off;
119 if (entry->post_probe)
120 entry->post_probe += gd->reloc_off;
121 if (entry->pre_remove)
122 entry->pre_remove += gd->reloc_off;
123 if (entry->child_post_bind)
124 entry->child_post_bind += gd->reloc_off;
125 if (entry->child_pre_probe)
126 entry->child_pre_probe += gd->reloc_off;
128 entry->init += gd->reloc_off;
130 entry->destroy += gd->reloc_off;
131 /* FIXME maybe also need to fix these ops */
133 entry->ops += gd->reloc_off;
137 void fix_devices(void)
139 struct driver_info *dev =
140 ll_entry_start(struct driver_info, driver_info);
141 const int n_ents = ll_entry_count(struct driver_info, driver_info);
142 struct driver_info *entry;
144 for (entry = dev; entry != dev + n_ents; entry++) {
146 entry->platdata += gd->reloc_off;
152 int dm_init(bool of_live)
157 dm_warn("Virtual root driver already exists!\n");
160 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
162 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
168 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
171 #if CONFIG_IS_ENABLED(OF_CONTROL)
172 # if CONFIG_IS_ENABLED(OF_LIVE)
174 DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
177 DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
179 ret = device_probe(DM_ROOT_NON_CONST);
188 device_remove(dm_root(), DM_REMOVE_NORMAL);
189 device_unbind(dm_root());
195 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
196 int dm_remove_devices_flags(uint flags)
198 device_remove(dm_root(), flags);
204 int dm_scan_platdata(bool pre_reloc_only)
208 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
209 if (ret == -ENOENT) {
210 dm_warn("Some drivers were not found\n");
217 #if CONFIG_IS_ENABLED(OF_LIVE)
218 static int dm_scan_fdt_live(struct udevice *parent,
219 const struct device_node *node_parent,
222 struct device_node *np;
225 for (np = node_parent->child; np; np = np->sibling) {
226 /* "chosen" node isn't a device itself but may contain some: */
227 if (!strcmp(np->name, "chosen")) {
228 pr_debug("parsing subnodes of \"chosen\"\n");
230 err = dm_scan_fdt_live(parent, np, pre_reloc_only);
236 if (!of_device_is_available(np)) {
237 pr_debug(" - ignoring disabled device\n");
240 err = lists_bind_fdt(parent, np_to_ofnode(np), NULL,
244 debug("%s: ret=%d\n", np->name, ret);
249 dm_warn("Some drivers failed to bind\n");
253 #endif /* CONFIG_IS_ENABLED(OF_LIVE) */
255 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
257 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
259 * This scans the subnodes of a device tree node and and creates a driver
262 * @parent: Parent device for the devices that will be created
263 * @blob: Pointer to device tree blob
264 * @offset: Offset of node to scan
265 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
266 * flag. If false bind all drivers.
267 * @return 0 if OK, -ve on error
269 static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
270 int offset, bool pre_reloc_only)
274 for (offset = fdt_first_subnode(blob, offset);
276 offset = fdt_next_subnode(blob, offset)) {
277 const char *node_name = fdt_get_name(blob, offset, NULL);
280 * The "chosen" and "firmware" nodes aren't devices
281 * themselves but may contain some:
283 if (!strcmp(node_name, "chosen") ||
284 !strcmp(node_name, "firmware")) {
285 pr_debug("parsing subnodes of \"%s\"\n", node_name);
287 err = dm_scan_fdt_node(parent, blob, offset,
294 if (!fdtdec_get_is_enabled(blob, offset)) {
295 pr_debug(" - ignoring disabled device\n");
298 err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL,
302 debug("%s: ret=%d\n", node_name, ret);
307 dm_warn("Some drivers failed to bind\n");
312 int dm_scan_fdt_dev(struct udevice *dev)
314 if (!dev_of_valid(dev))
317 #if CONFIG_IS_ENABLED(OF_LIVE)
318 if (of_live_active())
319 return dm_scan_fdt_live(dev, dev_np(dev),
320 gd->flags & GD_FLG_RELOC ? false : true);
323 return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
324 gd->flags & GD_FLG_RELOC ? false : true);
327 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
329 #if CONFIG_IS_ENABLED(OF_LIVE)
330 if (of_live_active())
331 return dm_scan_fdt_live(gd->dm_root, gd->of_root,
335 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
338 static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
339 int offset, bool pre_reloc_only)
345 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
349 node = ofnode_path(path);
350 if (!ofnode_valid(node))
353 #if CONFIG_IS_ENABLED(OF_LIVE)
354 if (of_live_active())
355 return dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only);
357 return dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset,
361 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
365 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
367 debug("dm_scan_fdt() failed: %d\n", ret);
371 ret = dm_scan_fdt_ofnode_path("/clocks", pre_reloc_only);
373 debug("scan for /clocks failed: %d\n", ret);
377 ret = dm_scan_fdt_ofnode_path("/firmware", pre_reloc_only);
379 debug("scan for /firmware failed: %d\n", ret);
384 __weak int dm_scan_other(bool pre_reloc_only)
389 int dm_init_and_scan(bool pre_reloc_only)
393 ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
395 debug("dm_init() failed: %d\n", ret);
398 ret = dm_scan_platdata(pre_reloc_only);
400 debug("dm_scan_platdata() failed: %d\n", ret);
404 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
405 ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
407 debug("dm_extended_scan_dt() failed: %d\n", ret);
412 ret = dm_scan_other(pre_reloc_only);
419 /* This is the root driver - all drivers are children of this */
420 U_BOOT_DRIVER(root_driver) = {
421 .name = "root_driver",
423 .priv_auto_alloc_size = sizeof(struct root_priv),
426 /* This is the root uclass */
427 UCLASS_DRIVER(root) = {