1 /* 2 * Copyright (c) 2013 Google, Inc 3 * 4 * (C) Copyright 2012 5 * Pavel Herrmann <morpheus.ibis@gmail.com> 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <errno.h> 12 #include <fdtdec.h> 13 #include <malloc.h> 14 #include <linux/libfdt.h> 15 #include <dm/device.h> 16 #include <dm/device-internal.h> 17 #include <dm/lists.h> 18 #include <dm/of.h> 19 #include <dm/of_access.h> 20 #include <dm/platdata.h> 21 #include <dm/read.h> 22 #include <dm/root.h> 23 #include <dm/uclass.h> 24 #include <dm/util.h> 25 #include <linux/list.h> 26 27 DECLARE_GLOBAL_DATA_PTR; 28 29 struct root_priv { 30 fdt_addr_t translation_offset; /* optional translation offset */ 31 }; 32 33 static const struct driver_info root_info = { 34 .name = "root_driver", 35 }; 36 37 struct udevice *dm_root(void) 38 { 39 if (!gd->dm_root) { 40 dm_warn("Virtual root driver does not exist!\n"); 41 return NULL; 42 } 43 44 return gd->dm_root; 45 } 46 47 void dm_fixup_for_gd_move(struct global_data *new_gd) 48 { 49 /* The sentinel node has moved, so update things that point to it */ 50 if (gd->dm_root) { 51 new_gd->uclass_root.next->prev = &new_gd->uclass_root; 52 new_gd->uclass_root.prev->next = &new_gd->uclass_root; 53 } 54 } 55 56 fdt_addr_t dm_get_translation_offset(void) 57 { 58 struct udevice *root = dm_root(); 59 struct root_priv *priv = dev_get_priv(root); 60 61 return priv->translation_offset; 62 } 63 64 void dm_set_translation_offset(fdt_addr_t offs) 65 { 66 struct udevice *root = dm_root(); 67 struct root_priv *priv = dev_get_priv(root); 68 69 priv->translation_offset = offs; 70 } 71 72 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 73 void fix_drivers(void) 74 { 75 struct driver *drv = 76 ll_entry_start(struct driver, driver); 77 const int n_ents = ll_entry_count(struct driver, driver); 78 struct driver *entry; 79 80 for (entry = drv; entry != drv + n_ents; entry++) { 81 if (entry->of_match) 82 entry->of_match = (const struct udevice_id *) 83 ((u32)entry->of_match + gd->reloc_off); 84 if (entry->bind) 85 entry->bind += gd->reloc_off; 86 if (entry->probe) 87 entry->probe += gd->reloc_off; 88 if (entry->remove) 89 entry->remove += gd->reloc_off; 90 if (entry->unbind) 91 entry->unbind += gd->reloc_off; 92 if (entry->ofdata_to_platdata) 93 entry->ofdata_to_platdata += gd->reloc_off; 94 if (entry->child_post_bind) 95 entry->child_post_bind += gd->reloc_off; 96 if (entry->child_pre_probe) 97 entry->child_pre_probe += gd->reloc_off; 98 if (entry->child_post_remove) 99 entry->child_post_remove += gd->reloc_off; 100 /* OPS are fixed in every uclass post_probe function */ 101 if (entry->ops) 102 entry->ops += gd->reloc_off; 103 } 104 } 105 106 void fix_uclass(void) 107 { 108 struct uclass_driver *uclass = 109 ll_entry_start(struct uclass_driver, uclass); 110 const int n_ents = ll_entry_count(struct uclass_driver, uclass); 111 struct uclass_driver *entry; 112 113 for (entry = uclass; entry != uclass + n_ents; entry++) { 114 if (entry->post_bind) 115 entry->post_bind += gd->reloc_off; 116 if (entry->pre_unbind) 117 entry->pre_unbind += gd->reloc_off; 118 if (entry->pre_probe) 119 entry->pre_probe += gd->reloc_off; 120 if (entry->post_probe) 121 entry->post_probe += gd->reloc_off; 122 if (entry->pre_remove) 123 entry->pre_remove += gd->reloc_off; 124 if (entry->child_post_bind) 125 entry->child_post_bind += gd->reloc_off; 126 if (entry->child_pre_probe) 127 entry->child_pre_probe += gd->reloc_off; 128 if (entry->init) 129 entry->init += gd->reloc_off; 130 if (entry->destroy) 131 entry->destroy += gd->reloc_off; 132 /* FIXME maybe also need to fix these ops */ 133 if (entry->ops) 134 entry->ops += gd->reloc_off; 135 } 136 } 137 138 void fix_devices(void) 139 { 140 struct driver_info *dev = 141 ll_entry_start(struct driver_info, driver_info); 142 const int n_ents = ll_entry_count(struct driver_info, driver_info); 143 struct driver_info *entry; 144 145 for (entry = dev; entry != dev + n_ents; entry++) { 146 if (entry->platdata) 147 entry->platdata += gd->reloc_off; 148 } 149 } 150 151 #endif 152 153 int dm_init(bool of_live) 154 { 155 int ret; 156 157 if (gd->dm_root) { 158 dm_warn("Virtual root driver already exists!\n"); 159 return -EINVAL; 160 } 161 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST); 162 163 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 164 fix_drivers(); 165 fix_uclass(); 166 fix_devices(); 167 #endif 168 169 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST); 170 if (ret) 171 return ret; 172 #if CONFIG_IS_ENABLED(OF_CONTROL) 173 # if CONFIG_IS_ENABLED(OF_LIVE) 174 if (of_live) 175 DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root); 176 else 177 #endif 178 DM_ROOT_NON_CONST->node = offset_to_ofnode(0); 179 #endif 180 ret = device_probe(DM_ROOT_NON_CONST); 181 if (ret) 182 return ret; 183 184 return 0; 185 } 186 187 int dm_uninit(void) 188 { 189 device_remove(dm_root(), DM_REMOVE_NORMAL); 190 device_unbind(dm_root()); 191 192 return 0; 193 } 194 195 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 196 int dm_remove_devices_flags(uint flags) 197 { 198 device_remove(dm_root(), flags); 199 200 return 0; 201 } 202 #endif 203 204 int dm_scan_platdata(bool pre_reloc_only) 205 { 206 int ret; 207 208 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only); 209 if (ret == -ENOENT) { 210 dm_warn("Some drivers were not found\n"); 211 ret = 0; 212 } 213 214 return ret; 215 } 216 217 #if CONFIG_IS_ENABLED(OF_LIVE) 218 static int dm_scan_fdt_live(struct udevice *parent, 219 const struct device_node *node_parent, 220 bool pre_reloc_only) 221 { 222 struct device_node *np; 223 int ret = 0, err; 224 225 for (np = node_parent->child; np; np = np->sibling) { 226 if (pre_reloc_only && 227 !of_find_property(np, "u-boot,dm-pre-reloc", NULL)) 228 continue; 229 if (!of_device_is_available(np)) { 230 pr_debug(" - ignoring disabled device\n"); 231 continue; 232 } 233 err = lists_bind_fdt(parent, np_to_ofnode(np), NULL); 234 if (err && !ret) { 235 ret = err; 236 debug("%s: ret=%d\n", np->name, ret); 237 } 238 } 239 240 if (ret) 241 dm_warn("Some drivers failed to bind\n"); 242 243 return ret; 244 } 245 #endif /* CONFIG_IS_ENABLED(OF_LIVE) */ 246 247 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) 248 /** 249 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node 250 * 251 * This scans the subnodes of a device tree node and and creates a driver 252 * for each one. 253 * 254 * @parent: Parent device for the devices that will be created 255 * @blob: Pointer to device tree blob 256 * @offset: Offset of node to scan 257 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC 258 * flag. If false bind all drivers. 259 * @return 0 if OK, -ve on error 260 */ 261 static int dm_scan_fdt_node(struct udevice *parent, const void *blob, 262 int offset, bool pre_reloc_only) 263 { 264 int ret = 0, err; 265 266 for (offset = fdt_first_subnode(blob, offset); 267 offset > 0; 268 offset = fdt_next_subnode(blob, offset)) { 269 /* "chosen" node isn't a device itself but may contain some: */ 270 if (!strcmp(fdt_get_name(blob, offset, NULL), "chosen")) { 271 pr_debug("parsing subnodes of \"chosen\"\n"); 272 273 err = dm_scan_fdt_node(parent, blob, offset, 274 pre_reloc_only); 275 if (err && !ret) 276 ret = err; 277 continue; 278 } 279 280 if (pre_reloc_only && 281 !dm_fdt_pre_reloc(blob, offset)) 282 continue; 283 if (!fdtdec_get_is_enabled(blob, offset)) { 284 pr_debug(" - ignoring disabled device\n"); 285 continue; 286 } 287 err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL); 288 if (err && !ret) { 289 ret = err; 290 debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL), 291 ret); 292 } 293 } 294 295 if (ret) 296 dm_warn("Some drivers failed to bind\n"); 297 298 return ret; 299 } 300 301 int dm_scan_fdt_dev(struct udevice *dev) 302 { 303 if (!dev_of_valid(dev)) 304 return 0; 305 306 #if CONFIG_IS_ENABLED(OF_LIVE) 307 if (of_live_active()) 308 return dm_scan_fdt_live(dev, dev_np(dev), 309 gd->flags & GD_FLG_RELOC ? false : true); 310 else 311 #endif 312 return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev), 313 gd->flags & GD_FLG_RELOC ? false : true); 314 } 315 316 int dm_scan_fdt(const void *blob, bool pre_reloc_only) 317 { 318 #if CONFIG_IS_ENABLED(OF_LIVE) 319 if (of_live_active()) 320 return dm_scan_fdt_live(gd->dm_root, gd->of_root, 321 pre_reloc_only); 322 else 323 #endif 324 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); 325 } 326 #else 327 static int dm_scan_fdt_node(struct udevice *parent, const void *blob, 328 int offset, bool pre_reloc_only) 329 { 330 return 0; 331 } 332 #endif 333 334 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only) 335 { 336 int node, ret; 337 338 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); 339 if (ret) { 340 debug("dm_scan_fdt() failed: %d\n", ret); 341 return ret; 342 } 343 344 /* bind fixed-clock */ 345 node = ofnode_to_offset(ofnode_path("/clocks")); 346 /* if no DT "clocks" node, no need to go further */ 347 if (node < 0) 348 return ret; 349 350 ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node, 351 pre_reloc_only); 352 if (ret) 353 debug("dm_scan_fdt_node() failed: %d\n", ret); 354 355 return ret; 356 } 357 358 __weak int dm_scan_other(bool pre_reloc_only) 359 { 360 return 0; 361 } 362 363 int dm_init_and_scan(bool pre_reloc_only) 364 { 365 int ret; 366 367 ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE)); 368 if (ret) { 369 debug("dm_init() failed: %d\n", ret); 370 return ret; 371 } 372 ret = dm_scan_platdata(pre_reloc_only); 373 if (ret) { 374 debug("dm_scan_platdata() failed: %d\n", ret); 375 return ret; 376 } 377 378 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) { 379 ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only); 380 if (ret) { 381 debug("dm_extended_scan_dt() failed: %d\n", ret); 382 return ret; 383 } 384 } 385 386 ret = dm_scan_other(pre_reloc_only); 387 if (ret) 388 return ret; 389 390 return 0; 391 } 392 393 /* This is the root driver - all drivers are children of this */ 394 U_BOOT_DRIVER(root_driver) = { 395 .name = "root_driver", 396 .id = UCLASS_ROOT, 397 .priv_auto_alloc_size = sizeof(struct root_priv), 398 }; 399 400 /* This is the root uclass */ 401 UCLASS_DRIVER(root) = { 402 .name = "root", 403 .id = UCLASS_ROOT, 404 }; 405