1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
9 #define LOG_CATEGORY UCLASS_ROOT
16 #include <asm-generic/sections.h>
17 #include <asm/global_data.h>
18 #include <linux/libfdt.h>
20 #include <dm/device.h>
21 #include <dm/device-internal.h>
24 #include <dm/of_access.h>
25 #include <dm/platdata.h>
28 #include <dm/uclass.h>
30 #include <linux/list.h>
32 DECLARE_GLOBAL_DATA_PTR;
34 static struct driver_info root_info = {
35 .name = "root_driver",
38 struct udevice *dm_root(void)
41 dm_warn("Virtual root driver does not exist!\n");
48 void dm_fixup_for_gd_move(struct global_data *new_gd)
50 /* The sentinel node has moved, so update things that point to it */
52 new_gd->uclass_root->next->prev = new_gd->uclass_root;
53 new_gd->uclass_root->prev->next = new_gd->uclass_root;
57 void fix_drivers(void)
60 ll_entry_start(struct driver, driver);
61 const int n_ents = ll_entry_count(struct driver, driver);
64 for (entry = drv; entry != drv + n_ents; entry++) {
66 entry->of_match = (const struct udevice_id *)
67 ((ulong)entry->of_match + gd->reloc_off);
69 entry->bind += gd->reloc_off;
71 entry->probe += gd->reloc_off;
73 entry->remove += gd->reloc_off;
75 entry->unbind += gd->reloc_off;
76 if (entry->of_to_plat)
77 entry->of_to_plat += gd->reloc_off;
78 if (entry->child_post_bind)
79 entry->child_post_bind += gd->reloc_off;
80 if (entry->child_pre_probe)
81 entry->child_pre_probe += gd->reloc_off;
82 if (entry->child_post_remove)
83 entry->child_post_remove += gd->reloc_off;
84 /* OPS are fixed in every uclass post_probe function */
86 entry->ops += gd->reloc_off;
92 struct uclass_driver *uclass =
93 ll_entry_start(struct uclass_driver, uclass_driver);
94 const int n_ents = ll_entry_count(struct uclass_driver, uclass_driver);
95 struct uclass_driver *entry;
97 for (entry = uclass; entry != uclass + n_ents; entry++) {
99 entry->post_bind += gd->reloc_off;
100 if (entry->pre_unbind)
101 entry->pre_unbind += gd->reloc_off;
102 if (entry->pre_probe)
103 entry->pre_probe += gd->reloc_off;
104 if (entry->post_probe)
105 entry->post_probe += gd->reloc_off;
106 if (entry->pre_remove)
107 entry->pre_remove += gd->reloc_off;
108 if (entry->child_post_bind)
109 entry->child_post_bind += gd->reloc_off;
110 if (entry->child_pre_probe)
111 entry->child_pre_probe += gd->reloc_off;
113 entry->init += gd->reloc_off;
115 entry->destroy += gd->reloc_off;
116 /* FIXME maybe also need to fix these ops */
118 entry->ops += gd->reloc_off;
122 void fix_devices(void)
124 struct driver_info *dev =
125 ll_entry_start(struct driver_info, driver_info);
126 const int n_ents = ll_entry_count(struct driver_info, driver_info);
127 struct driver_info *entry;
129 for (entry = dev; entry != dev + n_ents; entry++) {
131 entry->plat += gd->reloc_off;
135 static int dm_setup_inst(void)
137 DM_ROOT_NON_CONST = DM_DEVICE_GET(root);
139 if (CONFIG_IS_ENABLED(OF_PLATDATA_RT)) {
140 struct udevice_rt *urt;
145 /* Allocate the udevice_rt table */
146 n_ents = ll_entry_count(struct udevice, udevice);
147 urt = calloc(n_ents, sizeof(struct udevice_rt));
149 return log_msg_ret("urt", -ENOMEM);
150 gd_set_dm_udevice_rt(urt);
152 /* Now allocate space for the priv/plat data, and copy it in */
153 size = __priv_data_end - __priv_data_start;
155 base = calloc(1, size);
157 return log_msg_ret("priv", -ENOMEM);
158 memcpy(base, __priv_data_start, size);
159 gd_set_dm_priv_base(base);
165 int dm_init(bool of_live)
170 dm_warn("Virtual root driver already exists!\n");
173 if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
174 gd->uclass_root = &uclass_head;
176 gd->uclass_root = &DM_UCLASS_ROOT_S_NON_CONST;
177 INIT_LIST_HEAD(DM_UCLASS_ROOT_NON_CONST);
180 if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)) {
186 if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
187 ret = dm_setup_inst();
189 log_debug("dm_setup_inst() failed: %d\n", ret);
193 ret = device_bind_by_name(NULL, false, &root_info,
197 if (CONFIG_IS_ENABLED(OF_CONTROL))
198 dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
199 ret = device_probe(DM_ROOT_NON_CONST);
209 /* Remove non-vital devices first */
210 device_remove(dm_root(), DM_REMOVE_NON_VITAL);
211 device_remove(dm_root(), DM_REMOVE_NORMAL);
212 device_unbind(dm_root());
218 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
219 int dm_remove_devices_flags(uint flags)
221 device_remove(dm_root(), flags);
227 int dm_scan_plat(bool pre_reloc_only)
231 if (CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)) {
232 struct driver_rt *dyn;
235 n_ents = ll_entry_count(struct driver_info, driver_info);
236 dyn = calloc(n_ents, sizeof(struct driver_rt));
239 gd_set_dm_driver_rt(dyn);
242 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
243 if (ret == -ENOENT) {
244 dm_warn("Some drivers were not found\n");
251 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
253 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
255 * This scans the subnodes of a device tree node and and creates a driver
258 * @parent: Parent device for the devices that will be created
259 * @node: Node to scan
260 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
261 * flag. If false bind all drivers.
262 * @return 0 if OK, -ve on error
264 static int dm_scan_fdt_node(struct udevice *parent, ofnode parent_node,
267 int ret = 0, err = 0;
270 if (!ofnode_valid(parent_node))
273 for (node = ofnode_first_subnode(parent_node);
275 node = ofnode_next_subnode(node)) {
276 const char *node_name = ofnode_get_name(node);
278 if (!ofnode_is_enabled(node)) {
279 pr_debug(" - ignoring disabled device\n");
282 err = lists_bind_fdt(parent, node, NULL, pre_reloc_only);
285 debug("%s: ret=%d\n", node_name, ret);
290 dm_warn("Some drivers failed to bind\n");
295 int dm_scan_fdt_dev(struct udevice *dev)
297 return dm_scan_fdt_node(dev, dev_ofnode(dev),
298 gd->flags & GD_FLG_RELOC ? false : true);
301 int dm_scan_fdt(bool pre_reloc_only)
303 return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
306 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
310 node = ofnode_path(path);
312 return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
315 int dm_extended_scan(bool pre_reloc_only)
318 const char * const nodes[] = {
324 ret = dm_scan_fdt(pre_reloc_only);
326 debug("dm_scan_fdt() failed: %d\n", ret);
330 /* Some nodes aren't devices themselves but may contain some */
331 for (i = 0; i < ARRAY_SIZE(nodes); i++) {
332 ret = dm_scan_fdt_ofnode_path(nodes[i], pre_reloc_only);
334 debug("dm_scan_fdt() scan for %s failed: %d\n",
344 __weak int dm_scan_other(bool pre_reloc_only)
349 #if CONFIG_IS_ENABLED(OF_PLATDATA_INST) && CONFIG_IS_ENABLED(READ_ONLY)
350 void *dm_priv_to_rw(void *priv)
352 long offset = priv - (void *)__priv_data_start;
354 return gd_dm_priv_base() + offset;
359 * dm_scan() - Scan tables to bind devices
361 * Runs through the driver_info tables and binds the devices it finds. Then runs
362 * through the devicetree nodes. Finally calls dm_scan_other() to add any
365 * @pre_reloc_only: If true, bind only nodes with special devicetree properties,
366 * or drivers with the DM_FLAG_PRE_RELOC flag. If false bind all drivers.
368 static int dm_scan(bool pre_reloc_only)
372 ret = dm_scan_plat(pre_reloc_only);
374 debug("dm_scan_plat() failed: %d\n", ret);
378 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
379 ret = dm_extended_scan(pre_reloc_only);
381 debug("dm_extended_scan() failed: %d\n", ret);
386 ret = dm_scan_other(pre_reloc_only);
393 int dm_init_and_scan(bool pre_reloc_only)
397 ret = dm_init(CONFIG_IS_ENABLED(OF_LIVE));
399 debug("dm_init() failed: %d\n", ret);
402 if (!CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
403 ret = dm_scan(pre_reloc_only);
405 log_debug("dm_scan() failed: %d\n", ret);
413 #ifdef CONFIG_ACPIGEN
414 static int root_acpi_get_name(const struct udevice *dev, char *out_name)
416 return acpi_copy_name(out_name, "\\_SB");
419 struct acpi_ops root_acpi_ops = {
420 .get_name = root_acpi_get_name,
424 /* This is the root driver - all drivers are children of this */
425 U_BOOT_DRIVER(root_driver) = {
426 .name = "root_driver",
428 ACPI_OPS_PTR(&root_acpi_ops)
431 /* This is the root uclass */
432 UCLASS_DRIVER(root) = {