1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
9 #define LOG_CATEGORY UCLASS_ROOT
15 #include <asm-generic/sections.h>
16 #include <asm/global_data.h>
17 #include <linux/libfdt.h>
19 #include <dm/device.h>
20 #include <dm/device-internal.h>
23 #include <dm/of_access.h>
24 #include <dm/platdata.h>
27 #include <dm/uclass.h>
28 #include <dm/uclass-internal.h>
30 #include <linux/list.h>
31 #include <linux/printk.h>
33 DECLARE_GLOBAL_DATA_PTR;
35 static struct driver_info root_info = {
36 .name = "root_driver",
39 struct udevice *dm_root(void)
42 dm_warn("Virtual root driver does not exist!\n");
49 void dm_fixup_for_gd_move(struct global_data *new_gd)
51 /* The sentinel node has moved, so update things that point to it */
53 new_gd->uclass_root->next->prev = new_gd->uclass_root;
54 new_gd->uclass_root->prev->next = new_gd->uclass_root;
58 static int dm_setup_inst(void)
60 DM_ROOT_NON_CONST = DM_DEVICE_GET(root);
62 if (CONFIG_IS_ENABLED(OF_PLATDATA_RT)) {
63 struct udevice_rt *urt;
70 /* Allocate the udevice_rt table */
71 each_size = dm_udevice_size();
72 start = ll_entry_start(struct udevice, udevice);
73 end = ll_entry_end(struct udevice, udevice);
75 n_ents = size / each_size;
76 urt = calloc(n_ents, sizeof(struct udevice_rt));
78 return log_msg_ret("urt", -ENOMEM);
79 gd_set_dm_udevice_rt(urt);
81 /* Now allocate space for the priv/plat data, and copy it in */
82 size = __priv_data_end - __priv_data_start;
84 base = calloc(1, size);
86 return log_msg_ret("priv", -ENOMEM);
87 memcpy(base, __priv_data_start, size);
88 gd_set_dm_priv_base(base);
94 int dm_init(bool of_live)
99 dm_warn("Virtual root driver already exists!\n");
102 if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
103 gd->uclass_root = &uclass_head;
105 gd->uclass_root = &DM_UCLASS_ROOT_S_NON_CONST;
106 INIT_LIST_HEAD(DM_UCLASS_ROOT_NON_CONST);
109 if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
110 ret = dm_setup_inst();
112 log_debug("dm_setup_inst() failed: %d\n", ret);
116 ret = device_bind_by_name(NULL, false, &root_info,
120 if (CONFIG_IS_ENABLED(OF_CONTROL))
121 dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
122 ret = device_probe(DM_ROOT_NON_CONST);
127 INIT_LIST_HEAD((struct list_head *)&gd->dmtag_list);
134 /* Remove non-vital devices first */
135 device_remove(dm_root(), DM_REMOVE_NON_VITAL);
136 device_remove(dm_root(), DM_REMOVE_NORMAL);
137 device_unbind(dm_root());
143 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
144 int dm_remove_devices_flags(uint flags)
146 device_remove(dm_root(), flags);
152 int dm_scan_plat(bool pre_reloc_only)
156 if (CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)) {
157 struct driver_rt *dyn;
160 n_ents = ll_entry_count(struct driver_info, driver_info);
161 dyn = calloc(n_ents, sizeof(struct driver_rt));
164 gd_set_dm_driver_rt(dyn);
167 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
168 if (ret == -ENOENT) {
169 dm_warn("Some drivers were not found\n");
176 #if CONFIG_IS_ENABLED(OF_REAL)
178 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
180 * This scans the subnodes of a device tree node and and creates a driver
183 * @parent: Parent device for the devices that will be created
184 * @node: Node to scan
185 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
186 * flag. If false bind all drivers.
187 * Return: 0 if OK, -ve on error
189 static int dm_scan_fdt_node(struct udevice *parent, ofnode parent_node,
192 int ret = 0, err = 0;
195 if (!ofnode_valid(parent_node))
198 for (node = ofnode_first_subnode(parent_node);
200 node = ofnode_next_subnode(node)) {
201 const char *node_name = ofnode_get_name(node);
203 if (!ofnode_is_enabled(node)) {
204 pr_debug(" - ignoring disabled device\n");
207 err = lists_bind_fdt(parent, node, NULL, NULL, pre_reloc_only);
210 dm_warn("%s: ret=%d\n", node_name, ret);
215 dm_warn("Some drivers failed to bind\n");
220 int dm_scan_fdt_dev(struct udevice *dev)
222 return dm_scan_fdt_node(dev, dev_ofnode(dev),
223 gd->flags & GD_FLG_RELOC ? false : true);
226 int dm_scan_fdt(bool pre_reloc_only)
228 return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
231 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
235 node = ofnode_path(path);
237 return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
240 int dm_extended_scan(bool pre_reloc_only)
243 const char * const nodes[] = {
250 ret = dm_scan_fdt(pre_reloc_only);
252 dm_warn("dm_scan_fdt() failed: %d\n", ret);
256 /* Some nodes aren't devices themselves but may contain some */
257 for (i = 0; i < ARRAY_SIZE(nodes); i++) {
258 ret = dm_scan_fdt_ofnode_path(nodes[i], pre_reloc_only);
260 dm_warn("dm_scan_fdt() scan for %s failed: %d\n",
270 __weak int dm_scan_other(bool pre_reloc_only)
275 #if CONFIG_IS_ENABLED(OF_PLATDATA_INST) && CONFIG_IS_ENABLED(READ_ONLY)
276 void *dm_priv_to_rw(void *priv)
278 long offset = priv - (void *)__priv_data_start;
280 return gd_dm_priv_base() + offset;
284 static int dm_probe_devices(struct udevice *dev, bool pre_reloc_only)
286 ofnode node = dev_ofnode(dev);
287 struct udevice *child;
290 if (pre_reloc_only &&
291 (!ofnode_valid(node) || !ofnode_pre_reloc(node)) &&
292 !(dev->driver->flags & DM_FLAG_PRE_RELOC))
295 if (dev_get_flags(dev) & DM_FLAG_PROBE_AFTER_BIND) {
296 ret = device_probe(dev);
302 list_for_each_entry(child, &dev->child_head, sibling_node)
303 dm_probe_devices(child, pre_reloc_only);
309 * dm_scan() - Scan tables to bind devices
311 * Runs through the driver_info tables and binds the devices it finds. Then runs
312 * through the devicetree nodes. Finally calls dm_scan_other() to add any
315 * @pre_reloc_only: If true, bind only nodes with special devicetree properties,
316 * or drivers with the DM_FLAG_PRE_RELOC flag. If false bind all drivers.
318 static int dm_scan(bool pre_reloc_only)
322 ret = dm_scan_plat(pre_reloc_only);
324 dm_warn("dm_scan_plat() failed: %d\n", ret);
328 if (CONFIG_IS_ENABLED(OF_REAL)) {
329 ret = dm_extended_scan(pre_reloc_only);
331 dm_warn("dm_extended_scan() failed: %d\n", ret);
336 ret = dm_scan_other(pre_reloc_only);
340 return dm_probe_devices(gd->dm_root, pre_reloc_only);
343 int dm_init_and_scan(bool pre_reloc_only)
347 ret = dm_init(CONFIG_IS_ENABLED(OF_LIVE));
349 dm_warn("dm_init() failed: %d\n", ret);
352 if (!CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
353 ret = dm_scan(pre_reloc_only);
355 log_debug("dm_scan() failed: %d\n", ret);
359 if (CONFIG_IS_ENABLED(DM_EVENT)) {
360 ret = event_notify_null(gd->flags & GD_FLG_RELOC ?
364 return log_msg_ret("ev", ret);
370 void dm_get_stats(int *device_countp, int *uclass_countp)
372 *device_countp = device_get_decendent_count(gd->dm_root);
373 *uclass_countp = uclass_get_count();
376 void dev_collect_stats(struct dm_stats *stats, const struct udevice *parent)
378 const struct udevice *dev;
382 stats->dev_size += sizeof(struct udevice);
383 stats->dev_name_size += strlen(parent->name) + 1;
384 for (i = 0; i < DM_TAG_ATTACH_COUNT; i++) {
385 int size = dev_get_attach_size(parent, i);
388 (i == DM_TAG_DRIVER_DATA && parent->driver_data)) {
389 stats->attach_count[i]++;
390 stats->attach_size[i] += size;
391 stats->attach_count_total++;
392 stats->attach_size_total += size;
396 list_for_each_entry(dev, &parent->child_head, sibling_node)
397 dev_collect_stats(stats, dev);
400 void uclass_collect_stats(struct dm_stats *stats)
404 list_for_each_entry(uc, gd->uclass_root, sibling_node) {
408 stats->uc_size += sizeof(struct uclass);
409 size = uc->uc_drv->priv_auto;
411 stats->uc_attach_count++;
412 stats->uc_attach_size += size;
417 void dm_get_mem(struct dm_stats *stats)
419 memset(stats, '\0', sizeof(*stats));
420 dev_collect_stats(stats, gd->dm_root);
421 uclass_collect_stats(stats);
422 dev_tag_collect_stats(stats);
424 stats->total_size = stats->dev_size + stats->uc_size +
425 stats->attach_size_total + stats->uc_attach_size +
429 #if CONFIG_IS_ENABLED(ACPIGEN)
430 static int root_acpi_get_name(const struct udevice *dev, char *out_name)
432 return acpi_copy_name(out_name, "\\_SB");
435 struct acpi_ops root_acpi_ops = {
436 .get_name = root_acpi_get_name,
440 /* This is the root driver - all drivers are children of this */
441 U_BOOT_DRIVER(root_driver) = {
442 .name = "root_driver",
444 ACPI_OPS_PTR(&root_acpi_ops)
447 /* This is the root uclass */
448 UCLASS_DRIVER(root) = {