1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (c) 2013 Google, Inc 4 * 5 * (C) Copyright 2012 6 * Pavel Herrmann <morpheus.ibis@gmail.com> 7 */ 8 9 #include <common.h> 10 #include <errno.h> 11 #include <fdtdec.h> 12 #include <malloc.h> 13 #include <linux/libfdt.h> 14 #include <dm/device.h> 15 #include <dm/device-internal.h> 16 #include <dm/lists.h> 17 #include <dm/of.h> 18 #include <dm/of_access.h> 19 #include <dm/platdata.h> 20 #include <dm/read.h> 21 #include <dm/root.h> 22 #include <dm/uclass.h> 23 #include <dm/util.h> 24 #include <linux/list.h> 25 26 DECLARE_GLOBAL_DATA_PTR; 27 28 struct root_priv { 29 fdt_addr_t translation_offset; /* optional translation offset */ 30 }; 31 32 static const struct driver_info root_info = { 33 .name = "root_driver", 34 }; 35 36 struct udevice *dm_root(void) 37 { 38 if (!gd->dm_root) { 39 dm_warn("Virtual root driver does not exist!\n"); 40 return NULL; 41 } 42 43 return gd->dm_root; 44 } 45 46 void dm_fixup_for_gd_move(struct global_data *new_gd) 47 { 48 /* The sentinel node has moved, so update things that point to it */ 49 if (gd->dm_root) { 50 new_gd->uclass_root.next->prev = &new_gd->uclass_root; 51 new_gd->uclass_root.prev->next = &new_gd->uclass_root; 52 } 53 } 54 55 fdt_addr_t dm_get_translation_offset(void) 56 { 57 struct udevice *root = dm_root(); 58 struct root_priv *priv = dev_get_priv(root); 59 60 return priv->translation_offset; 61 } 62 63 void dm_set_translation_offset(fdt_addr_t offs) 64 { 65 struct udevice *root = dm_root(); 66 struct root_priv *priv = dev_get_priv(root); 67 68 priv->translation_offset = offs; 69 } 70 71 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 72 void fix_drivers(void) 73 { 74 struct driver *drv = 75 ll_entry_start(struct driver, driver); 76 const int n_ents = ll_entry_count(struct driver, driver); 77 struct driver *entry; 78 79 for (entry = drv; entry != drv + n_ents; entry++) { 80 if (entry->of_match) 81 entry->of_match = (const struct udevice_id *) 82 ((u32)entry->of_match + gd->reloc_off); 83 if (entry->bind) 84 entry->bind += gd->reloc_off; 85 if (entry->probe) 86 entry->probe += gd->reloc_off; 87 if (entry->remove) 88 entry->remove += gd->reloc_off; 89 if (entry->unbind) 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 */ 100 if (entry->ops) 101 entry->ops += gd->reloc_off; 102 } 103 } 104 105 void fix_uclass(void) 106 { 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; 111 112 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; 127 if (entry->init) 128 entry->init += gd->reloc_off; 129 if (entry->destroy) 130 entry->destroy += gd->reloc_off; 131 /* FIXME maybe also need to fix these ops */ 132 if (entry->ops) 133 entry->ops += gd->reloc_off; 134 } 135 } 136 137 void fix_devices(void) 138 { 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; 143 144 for (entry = dev; entry != dev + n_ents; entry++) { 145 if (entry->platdata) 146 entry->platdata += gd->reloc_off; 147 } 148 } 149 150 #endif 151 152 int dm_init(bool of_live) 153 { 154 int ret; 155 156 if (gd->dm_root) { 157 dm_warn("Virtual root driver already exists!\n"); 158 return -EINVAL; 159 } 160 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST); 161 162 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 163 fix_drivers(); 164 fix_uclass(); 165 fix_devices(); 166 #endif 167 168 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST); 169 if (ret) 170 return ret; 171 #if CONFIG_IS_ENABLED(OF_CONTROL) 172 # if CONFIG_IS_ENABLED(OF_LIVE) 173 if (of_live) 174 DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root); 175 else 176 #endif 177 DM_ROOT_NON_CONST->node = offset_to_ofnode(0); 178 #endif 179 ret = device_probe(DM_ROOT_NON_CONST); 180 if (ret) 181 return ret; 182 183 return 0; 184 } 185 186 int dm_uninit(void) 187 { 188 device_remove(dm_root(), DM_REMOVE_NORMAL); 189 device_unbind(dm_root()); 190 191 return 0; 192 } 193 194 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 195 int dm_remove_devices_flags(uint flags) 196 { 197 device_remove(dm_root(), flags); 198 199 return 0; 200 } 201 #endif 202 203 int dm_scan_platdata(bool pre_reloc_only) 204 { 205 int ret; 206 207 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only); 208 if (ret == -ENOENT) { 209 dm_warn("Some drivers were not found\n"); 210 ret = 0; 211 } 212 213 return ret; 214 } 215 216 #if CONFIG_IS_ENABLED(OF_LIVE) 217 static int dm_scan_fdt_live(struct udevice *parent, 218 const struct device_node *node_parent, 219 bool pre_reloc_only) 220 { 221 struct device_node *np; 222 int ret = 0, err; 223 224 for (np = node_parent->child; np; np = np->sibling) { 225 /* "chosen" node isn't a device itself but may contain some: */ 226 if (!strcmp(np->name, "chosen")) { 227 pr_debug("parsing subnodes of \"chosen\"\n"); 228 229 err = dm_scan_fdt_live(parent, np, pre_reloc_only); 230 if (err && !ret) 231 ret = err; 232 continue; 233 } 234 235 if (!of_device_is_available(np)) { 236 pr_debug(" - ignoring disabled device\n"); 237 continue; 238 } 239 err = lists_bind_fdt(parent, np_to_ofnode(np), NULL, 240 pre_reloc_only); 241 if (err && !ret) { 242 ret = err; 243 debug("%s: ret=%d\n", np->name, ret); 244 } 245 } 246 247 if (ret) 248 dm_warn("Some drivers failed to bind\n"); 249 250 return ret; 251 } 252 #endif /* CONFIG_IS_ENABLED(OF_LIVE) */ 253 254 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) 255 /** 256 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node 257 * 258 * This scans the subnodes of a device tree node and and creates a driver 259 * for each one. 260 * 261 * @parent: Parent device for the devices that will be created 262 * @blob: Pointer to device tree blob 263 * @offset: Offset of node to scan 264 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC 265 * flag. If false bind all drivers. 266 * @return 0 if OK, -ve on error 267 */ 268 static int dm_scan_fdt_node(struct udevice *parent, const void *blob, 269 int offset, bool pre_reloc_only) 270 { 271 int ret = 0, err; 272 273 for (offset = fdt_first_subnode(blob, offset); 274 offset > 0; 275 offset = fdt_next_subnode(blob, offset)) { 276 const char *node_name = fdt_get_name(blob, offset, NULL); 277 278 /* 279 * The "chosen" and "firmware" nodes aren't devices 280 * themselves but may contain some: 281 */ 282 if (!strcmp(node_name, "chosen") || 283 !strcmp(node_name, "firmware")) { 284 pr_debug("parsing subnodes of \"%s\"\n", node_name); 285 286 err = dm_scan_fdt_node(parent, blob, offset, 287 pre_reloc_only); 288 if (err && !ret) 289 ret = err; 290 continue; 291 } 292 293 if (!fdtdec_get_is_enabled(blob, offset)) { 294 pr_debug(" - ignoring disabled device\n"); 295 continue; 296 } 297 err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL, 298 pre_reloc_only); 299 if (err && !ret) { 300 ret = err; 301 debug("%s: ret=%d\n", node_name, ret); 302 } 303 } 304 305 if (ret) 306 dm_warn("Some drivers failed to bind\n"); 307 308 return ret; 309 } 310 311 int dm_scan_fdt_dev(struct udevice *dev) 312 { 313 if (!dev_of_valid(dev)) 314 return 0; 315 316 #if CONFIG_IS_ENABLED(OF_LIVE) 317 if (of_live_active()) 318 return dm_scan_fdt_live(dev, dev_np(dev), 319 gd->flags & GD_FLG_RELOC ? false : true); 320 else 321 #endif 322 return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev), 323 gd->flags & GD_FLG_RELOC ? false : true); 324 } 325 326 int dm_scan_fdt(const void *blob, bool pre_reloc_only) 327 { 328 #if CONFIG_IS_ENABLED(OF_LIVE) 329 if (of_live_active()) 330 return dm_scan_fdt_live(gd->dm_root, gd->of_root, 331 pre_reloc_only); 332 else 333 #endif 334 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); 335 } 336 #else 337 static int dm_scan_fdt_node(struct udevice *parent, const void *blob, 338 int offset, bool pre_reloc_only) 339 { 340 return 0; 341 } 342 #endif 343 344 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only) 345 { 346 ofnode node; 347 348 node = ofnode_path(path); 349 if (!ofnode_valid(node)) 350 return 0; 351 352 #if CONFIG_IS_ENABLED(OF_LIVE) 353 if (of_live_active()) 354 return dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only); 355 #endif 356 return dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset, 357 pre_reloc_only); 358 } 359 360 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only) 361 { 362 int ret; 363 364 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); 365 if (ret) { 366 debug("dm_scan_fdt() failed: %d\n", ret); 367 return ret; 368 } 369 370 ret = dm_scan_fdt_ofnode_path("/clocks", pre_reloc_only); 371 if (ret) { 372 debug("scan for /clocks failed: %d\n", ret); 373 return ret; 374 } 375 376 ret = dm_scan_fdt_ofnode_path("/firmware", pre_reloc_only); 377 if (ret) 378 debug("scan for /firmware failed: %d\n", ret); 379 380 return ret; 381 } 382 383 __weak int dm_scan_other(bool pre_reloc_only) 384 { 385 return 0; 386 } 387 388 int dm_init_and_scan(bool pre_reloc_only) 389 { 390 int ret; 391 392 ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE)); 393 if (ret) { 394 debug("dm_init() failed: %d\n", ret); 395 return ret; 396 } 397 ret = dm_scan_platdata(pre_reloc_only); 398 if (ret) { 399 debug("dm_scan_platdata() failed: %d\n", ret); 400 return ret; 401 } 402 403 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) { 404 ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only); 405 if (ret) { 406 debug("dm_extended_scan_dt() failed: %d\n", ret); 407 return ret; 408 } 409 } 410 411 ret = dm_scan_other(pre_reloc_only); 412 if (ret) 413 return ret; 414 415 return 0; 416 } 417 418 /* This is the root driver - all drivers are children of this */ 419 U_BOOT_DRIVER(root_driver) = { 420 .name = "root_driver", 421 .id = UCLASS_ROOT, 422 .priv_auto_alloc_size = sizeof(struct root_priv), 423 }; 424 425 /* This is the root uclass */ 426 UCLASS_DRIVER(root) = { 427 .name = "root", 428 .id = UCLASS_ROOT, 429 }; 430