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 <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 if (pre_reloc_only && 270 !dm_fdt_pre_reloc(blob, offset)) 271 continue; 272 if (!fdtdec_get_is_enabled(blob, offset)) { 273 pr_debug(" - ignoring disabled device\n"); 274 continue; 275 } 276 err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL); 277 if (err && !ret) { 278 ret = err; 279 debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL), 280 ret); 281 } 282 } 283 284 if (ret) 285 dm_warn("Some drivers failed to bind\n"); 286 287 return ret; 288 } 289 290 int dm_scan_fdt_dev(struct udevice *dev) 291 { 292 if (!dev_of_valid(dev)) 293 return 0; 294 295 #if CONFIG_IS_ENABLED(OF_LIVE) 296 if (of_live_active()) 297 return dm_scan_fdt_live(dev, dev_np(dev), 298 gd->flags & GD_FLG_RELOC ? false : true); 299 else 300 #endif 301 return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev), 302 gd->flags & GD_FLG_RELOC ? false : true); 303 } 304 305 int dm_scan_fdt(const void *blob, bool pre_reloc_only) 306 { 307 #if CONFIG_IS_ENABLED(OF_LIVE) 308 if (of_live_active()) 309 return dm_scan_fdt_live(gd->dm_root, gd->of_root, 310 pre_reloc_only); 311 else 312 #endif 313 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); 314 } 315 #else 316 static int dm_scan_fdt_node(struct udevice *parent, const void *blob, 317 int offset, bool pre_reloc_only) 318 { 319 return 0; 320 } 321 #endif 322 323 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only) 324 { 325 int node, ret; 326 327 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); 328 if (ret) { 329 debug("dm_scan_fdt() failed: %d\n", ret); 330 return ret; 331 } 332 333 /* bind fixed-clock */ 334 node = ofnode_to_offset(ofnode_path("/clocks")); 335 /* if no DT "clocks" node, no need to go further */ 336 if (node < 0) 337 return ret; 338 339 ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node, 340 pre_reloc_only); 341 if (ret) 342 debug("dm_scan_fdt_node() failed: %d\n", ret); 343 344 return ret; 345 } 346 347 __weak int dm_scan_other(bool pre_reloc_only) 348 { 349 return 0; 350 } 351 352 int dm_init_and_scan(bool pre_reloc_only) 353 { 354 int ret; 355 356 ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE)); 357 if (ret) { 358 debug("dm_init() failed: %d\n", ret); 359 return ret; 360 } 361 ret = dm_scan_platdata(pre_reloc_only); 362 if (ret) { 363 debug("dm_scan_platdata() failed: %d\n", ret); 364 return ret; 365 } 366 367 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) { 368 ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only); 369 if (ret) { 370 debug("dm_extended_scan_dt() failed: %d\n", ret); 371 return ret; 372 } 373 } 374 375 ret = dm_scan_other(pre_reloc_only); 376 if (ret) 377 return ret; 378 379 return 0; 380 } 381 382 /* This is the root driver - all drivers are children of this */ 383 U_BOOT_DRIVER(root_driver) = { 384 .name = "root_driver", 385 .id = UCLASS_ROOT, 386 .priv_auto_alloc_size = sizeof(struct root_priv), 387 }; 388 389 /* This is the root uclass */ 390 UCLASS_DRIVER(root) = { 391 .name = "root", 392 .id = UCLASS_ROOT, 393 }; 394