1 #ifndef _LINUX_OF_H 2 #define _LINUX_OF_H 3 /* 4 * Definitions for talking to the Open Firmware PROM on 5 * Power Macintosh and other computers. 6 * 7 * Copyright (C) 1996-2005 Paul Mackerras. 8 * 9 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp. 10 * Updates for SPARC64 by David S. Miller 11 * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp. 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License 15 * as published by the Free Software Foundation; either version 16 * 2 of the License, or (at your option) any later version. 17 */ 18 #include <linux/types.h> 19 #include <linux/bitops.h> 20 #include <linux/errno.h> 21 #include <linux/kref.h> 22 #include <linux/mod_devicetable.h> 23 #include <linux/spinlock.h> 24 #include <linux/topology.h> 25 #include <linux/notifier.h> 26 27 #include <asm/byteorder.h> 28 #include <asm/errno.h> 29 30 typedef u32 phandle; 31 typedef u32 ihandle; 32 33 struct property { 34 char *name; 35 int length; 36 void *value; 37 struct property *next; 38 unsigned long _flags; 39 unsigned int unique_id; 40 }; 41 42 #if defined(CONFIG_SPARC) 43 struct of_irq_controller; 44 #endif 45 46 struct device_node { 47 const char *name; 48 const char *type; 49 phandle phandle; 50 const char *full_name; 51 52 struct property *properties; 53 struct property *deadprops; /* removed properties */ 54 struct device_node *parent; 55 struct device_node *child; 56 struct device_node *sibling; 57 struct device_node *next; /* next device of same type */ 58 struct device_node *allnext; /* next in list of all nodes */ 59 struct proc_dir_entry *pde; /* this node's proc directory */ 60 struct kref kref; 61 unsigned long _flags; 62 void *data; 63 #if defined(CONFIG_SPARC) 64 const char *path_component_name; 65 unsigned int unique_id; 66 struct of_irq_controller *irq_trans; 67 #endif 68 }; 69 70 #define MAX_PHANDLE_ARGS 8 71 struct of_phandle_args { 72 struct device_node *np; 73 int args_count; 74 uint32_t args[MAX_PHANDLE_ARGS]; 75 }; 76 77 #ifdef CONFIG_OF_DYNAMIC 78 extern struct device_node *of_node_get(struct device_node *node); 79 extern void of_node_put(struct device_node *node); 80 #else /* CONFIG_OF_DYNAMIC */ 81 /* Dummy ref counting routines - to be implemented later */ 82 static inline struct device_node *of_node_get(struct device_node *node) 83 { 84 return node; 85 } 86 static inline void of_node_put(struct device_node *node) { } 87 #endif /* !CONFIG_OF_DYNAMIC */ 88 89 #ifdef CONFIG_OF 90 91 /* Pointer for first entry in chain of all nodes. */ 92 extern struct device_node *of_allnodes; 93 extern struct device_node *of_chosen; 94 extern struct device_node *of_aliases; 95 extern raw_spinlock_t devtree_lock; 96 97 static inline bool of_have_populated_dt(void) 98 { 99 return of_allnodes != NULL; 100 } 101 102 static inline bool of_node_is_root(const struct device_node *node) 103 { 104 return node && (node->parent == NULL); 105 } 106 107 static inline int of_node_check_flag(struct device_node *n, unsigned long flag) 108 { 109 return test_bit(flag, &n->_flags); 110 } 111 112 static inline void of_node_set_flag(struct device_node *n, unsigned long flag) 113 { 114 set_bit(flag, &n->_flags); 115 } 116 117 extern struct device_node *of_find_all_nodes(struct device_node *prev); 118 119 /* 120 * OF address retrieval & translation 121 */ 122 123 /* Helper to read a big number; size is in cells (not bytes) */ 124 static inline u64 of_read_number(const __be32 *cell, int size) 125 { 126 u64 r = 0; 127 while (size--) 128 r = (r << 32) | be32_to_cpu(*(cell++)); 129 return r; 130 } 131 132 /* Like of_read_number, but we want an unsigned long result */ 133 static inline unsigned long of_read_ulong(const __be32 *cell, int size) 134 { 135 /* toss away upper bits if unsigned long is smaller than u64 */ 136 return of_read_number(cell, size); 137 } 138 139 #if defined(CONFIG_SPARC) 140 #include <asm/prom.h> 141 #endif 142 143 /* Default #address and #size cells. Allow arch asm/prom.h to override */ 144 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT) 145 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1 146 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1 147 #endif 148 149 /* Default string compare functions, Allow arch asm/prom.h to override */ 150 #if !defined(of_compat_cmp) 151 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2)) 152 #define of_prop_cmp(s1, s2) strcmp((s1), (s2)) 153 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2)) 154 #endif 155 156 /* flag descriptions */ 157 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */ 158 #define OF_DETACHED 2 /* node has been detached from the device tree */ 159 160 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags) 161 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags) 162 163 #define OF_BAD_ADDR ((u64)-1) 164 165 static inline const char *of_node_full_name(const struct device_node *np) 166 { 167 return np ? np->full_name : "<no-node>"; 168 } 169 170 extern struct device_node *of_find_node_by_name(struct device_node *from, 171 const char *name); 172 #define for_each_node_by_name(dn, name) \ 173 for (dn = of_find_node_by_name(NULL, name); dn; \ 174 dn = of_find_node_by_name(dn, name)) 175 extern struct device_node *of_find_node_by_type(struct device_node *from, 176 const char *type); 177 #define for_each_node_by_type(dn, type) \ 178 for (dn = of_find_node_by_type(NULL, type); dn; \ 179 dn = of_find_node_by_type(dn, type)) 180 extern struct device_node *of_find_compatible_node(struct device_node *from, 181 const char *type, const char *compat); 182 #define for_each_compatible_node(dn, type, compatible) \ 183 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \ 184 dn = of_find_compatible_node(dn, type, compatible)) 185 extern struct device_node *of_find_matching_node_and_match( 186 struct device_node *from, 187 const struct of_device_id *matches, 188 const struct of_device_id **match); 189 static inline struct device_node *of_find_matching_node( 190 struct device_node *from, 191 const struct of_device_id *matches) 192 { 193 return of_find_matching_node_and_match(from, matches, NULL); 194 } 195 #define for_each_matching_node(dn, matches) \ 196 for (dn = of_find_matching_node(NULL, matches); dn; \ 197 dn = of_find_matching_node(dn, matches)) 198 #define for_each_matching_node_and_match(dn, matches, match) \ 199 for (dn = of_find_matching_node_and_match(NULL, matches, match); \ 200 dn; dn = of_find_matching_node_and_match(dn, matches, match)) 201 extern struct device_node *of_find_node_by_path(const char *path); 202 extern struct device_node *of_find_node_by_phandle(phandle handle); 203 extern struct device_node *of_get_parent(const struct device_node *node); 204 extern struct device_node *of_get_next_parent(struct device_node *node); 205 extern struct device_node *of_get_next_child(const struct device_node *node, 206 struct device_node *prev); 207 extern struct device_node *of_get_next_available_child( 208 const struct device_node *node, struct device_node *prev); 209 210 extern struct device_node *of_get_child_by_name(const struct device_node *node, 211 const char *name); 212 #define for_each_child_of_node(parent, child) \ 213 for (child = of_get_next_child(parent, NULL); child != NULL; \ 214 child = of_get_next_child(parent, child)) 215 216 #define for_each_available_child_of_node(parent, child) \ 217 for (child = of_get_next_available_child(parent, NULL); child != NULL; \ 218 child = of_get_next_available_child(parent, child)) 219 220 static inline int of_get_child_count(const struct device_node *np) 221 { 222 struct device_node *child; 223 int num = 0; 224 225 for_each_child_of_node(np, child) 226 num++; 227 228 return num; 229 } 230 231 static inline int of_get_available_child_count(const struct device_node *np) 232 { 233 struct device_node *child; 234 int num = 0; 235 236 for_each_available_child_of_node(np, child) 237 num++; 238 239 return num; 240 } 241 242 /* cache lookup */ 243 extern struct device_node *of_find_next_cache_node(const struct device_node *); 244 extern struct device_node *of_find_node_with_property( 245 struct device_node *from, const char *prop_name); 246 #define for_each_node_with_property(dn, prop_name) \ 247 for (dn = of_find_node_with_property(NULL, prop_name); dn; \ 248 dn = of_find_node_with_property(dn, prop_name)) 249 250 extern struct property *of_find_property(const struct device_node *np, 251 const char *name, 252 int *lenp); 253 extern int of_property_read_u32_index(const struct device_node *np, 254 const char *propname, 255 u32 index, u32 *out_value); 256 extern int of_property_read_u8_array(const struct device_node *np, 257 const char *propname, u8 *out_values, size_t sz); 258 extern int of_property_read_u16_array(const struct device_node *np, 259 const char *propname, u16 *out_values, size_t sz); 260 extern int of_property_read_u32_array(const struct device_node *np, 261 const char *propname, 262 u32 *out_values, 263 size_t sz); 264 extern int of_property_read_u64(const struct device_node *np, 265 const char *propname, u64 *out_value); 266 267 extern int of_property_read_string(struct device_node *np, 268 const char *propname, 269 const char **out_string); 270 extern int of_property_read_string_index(struct device_node *np, 271 const char *propname, 272 int index, const char **output); 273 extern int of_property_match_string(struct device_node *np, 274 const char *propname, 275 const char *string); 276 extern int of_property_count_strings(struct device_node *np, 277 const char *propname); 278 extern int of_device_is_compatible(const struct device_node *device, 279 const char *); 280 extern int of_device_is_available(const struct device_node *device); 281 extern const void *of_get_property(const struct device_node *node, 282 const char *name, 283 int *lenp); 284 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread); 285 #define for_each_property_of_node(dn, pp) \ 286 for (pp = dn->properties; pp != NULL; pp = pp->next) 287 288 extern int of_n_addr_cells(struct device_node *np); 289 extern int of_n_size_cells(struct device_node *np); 290 extern const struct of_device_id *of_match_node( 291 const struct of_device_id *matches, const struct device_node *node); 292 extern int of_modalias_node(struct device_node *node, char *modalias, int len); 293 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args); 294 extern struct device_node *of_parse_phandle(const struct device_node *np, 295 const char *phandle_name, 296 int index); 297 extern int of_parse_phandle_with_args(const struct device_node *np, 298 const char *list_name, const char *cells_name, int index, 299 struct of_phandle_args *out_args); 300 extern int of_parse_phandle_with_fixed_args(const struct device_node *np, 301 const char *list_name, int cells_count, int index, 302 struct of_phandle_args *out_args); 303 extern int of_count_phandle_with_args(const struct device_node *np, 304 const char *list_name, const char *cells_name); 305 306 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align)); 307 extern int of_alias_get_id(struct device_node *np, const char *stem); 308 309 extern int of_machine_is_compatible(const char *compat); 310 311 extern int of_add_property(struct device_node *np, struct property *prop); 312 extern int of_remove_property(struct device_node *np, struct property *prop); 313 extern int of_update_property(struct device_node *np, struct property *newprop); 314 315 /* For updating the device tree at runtime */ 316 #define OF_RECONFIG_ATTACH_NODE 0x0001 317 #define OF_RECONFIG_DETACH_NODE 0x0002 318 #define OF_RECONFIG_ADD_PROPERTY 0x0003 319 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004 320 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005 321 322 struct of_prop_reconfig { 323 struct device_node *dn; 324 struct property *prop; 325 }; 326 327 extern int of_reconfig_notifier_register(struct notifier_block *); 328 extern int of_reconfig_notifier_unregister(struct notifier_block *); 329 extern int of_reconfig_notify(unsigned long, void *); 330 331 extern int of_attach_node(struct device_node *); 332 extern int of_detach_node(struct device_node *); 333 334 #define of_match_ptr(_ptr) (_ptr) 335 336 /* 337 * struct property *prop; 338 * const __be32 *p; 339 * u32 u; 340 * 341 * of_property_for_each_u32(np, "propname", prop, p, u) 342 * printk("U32 value: %x\n", u); 343 */ 344 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur, 345 u32 *pu); 346 /* 347 * struct property *prop; 348 * const char *s; 349 * 350 * of_property_for_each_string(np, "propname", prop, s) 351 * printk("String value: %s\n", s); 352 */ 353 const char *of_prop_next_string(struct property *prop, const char *cur); 354 355 int of_device_is_stdout_path(struct device_node *dn); 356 357 #else /* CONFIG_OF */ 358 359 static inline const char* of_node_full_name(struct device_node *np) 360 { 361 return "<no-node>"; 362 } 363 364 static inline struct device_node *of_find_node_by_name(struct device_node *from, 365 const char *name) 366 { 367 return NULL; 368 } 369 370 static inline struct device_node *of_get_parent(const struct device_node *node) 371 { 372 return NULL; 373 } 374 375 static inline bool of_have_populated_dt(void) 376 { 377 return false; 378 } 379 380 #define for_each_child_of_node(parent, child) \ 381 while (0) 382 383 #define for_each_available_child_of_node(parent, child) \ 384 while (0) 385 386 static inline struct device_node *of_get_child_by_name( 387 const struct device_node *node, 388 const char *name) 389 { 390 return NULL; 391 } 392 393 static inline int of_get_child_count(const struct device_node *np) 394 { 395 return 0; 396 } 397 398 static inline int of_get_available_child_count(const struct device_node *np) 399 { 400 return 0; 401 } 402 403 static inline int of_device_is_compatible(const struct device_node *device, 404 const char *name) 405 { 406 return 0; 407 } 408 409 static inline int of_device_is_available(const struct device_node *device) 410 { 411 return 0; 412 } 413 414 static inline struct property *of_find_property(const struct device_node *np, 415 const char *name, 416 int *lenp) 417 { 418 return NULL; 419 } 420 421 static inline struct device_node *of_find_compatible_node( 422 struct device_node *from, 423 const char *type, 424 const char *compat) 425 { 426 return NULL; 427 } 428 429 static inline int of_property_read_u32_index(const struct device_node *np, 430 const char *propname, u32 index, u32 *out_value) 431 { 432 return -ENOSYS; 433 } 434 435 static inline int of_property_read_u8_array(const struct device_node *np, 436 const char *propname, u8 *out_values, size_t sz) 437 { 438 return -ENOSYS; 439 } 440 441 static inline int of_property_read_u16_array(const struct device_node *np, 442 const char *propname, u16 *out_values, size_t sz) 443 { 444 return -ENOSYS; 445 } 446 447 static inline int of_property_read_u32_array(const struct device_node *np, 448 const char *propname, 449 u32 *out_values, size_t sz) 450 { 451 return -ENOSYS; 452 } 453 454 static inline int of_property_read_string(struct device_node *np, 455 const char *propname, 456 const char **out_string) 457 { 458 return -ENOSYS; 459 } 460 461 static inline int of_property_read_string_index(struct device_node *np, 462 const char *propname, int index, 463 const char **out_string) 464 { 465 return -ENOSYS; 466 } 467 468 static inline int of_property_count_strings(struct device_node *np, 469 const char *propname) 470 { 471 return -ENOSYS; 472 } 473 474 static inline const void *of_get_property(const struct device_node *node, 475 const char *name, 476 int *lenp) 477 { 478 return NULL; 479 } 480 481 static inline struct device_node *of_get_cpu_node(int cpu, 482 unsigned int *thread) 483 { 484 return NULL; 485 } 486 487 static inline int of_property_read_u64(const struct device_node *np, 488 const char *propname, u64 *out_value) 489 { 490 return -ENOSYS; 491 } 492 493 static inline int of_property_match_string(struct device_node *np, 494 const char *propname, 495 const char *string) 496 { 497 return -ENOSYS; 498 } 499 500 static inline struct device_node *of_parse_phandle(const struct device_node *np, 501 const char *phandle_name, 502 int index) 503 { 504 return NULL; 505 } 506 507 static inline int of_parse_phandle_with_args(struct device_node *np, 508 const char *list_name, 509 const char *cells_name, 510 int index, 511 struct of_phandle_args *out_args) 512 { 513 return -ENOSYS; 514 } 515 516 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np, 517 const char *list_name, int cells_count, int index, 518 struct of_phandle_args *out_args) 519 { 520 return -ENOSYS; 521 } 522 523 static inline int of_count_phandle_with_args(struct device_node *np, 524 const char *list_name, 525 const char *cells_name) 526 { 527 return -ENOSYS; 528 } 529 530 static inline int of_alias_get_id(struct device_node *np, const char *stem) 531 { 532 return -ENOSYS; 533 } 534 535 static inline int of_machine_is_compatible(const char *compat) 536 { 537 return 0; 538 } 539 540 static inline int of_device_is_stdout_path(struct device_node *dn) 541 { 542 return 0; 543 } 544 545 static inline const __be32 *of_prop_next_u32(struct property *prop, 546 const __be32 *cur, u32 *pu) 547 { 548 return NULL; 549 } 550 551 static inline const char *of_prop_next_string(struct property *prop, 552 const char *cur) 553 { 554 return NULL; 555 } 556 557 #define of_match_ptr(_ptr) NULL 558 #define of_match_node(_matches, _node) NULL 559 #endif /* CONFIG_OF */ 560 561 #if defined(CONFIG_OF) && defined(CONFIG_NUMA) 562 extern int of_node_to_nid(struct device_node *np); 563 #else 564 static inline int of_node_to_nid(struct device_node *device) { return 0; } 565 #endif 566 567 /** 568 * of_property_read_bool - Findfrom a property 569 * @np: device node from which the property value is to be read. 570 * @propname: name of the property to be searched. 571 * 572 * Search for a property in a device node. 573 * Returns true if the property exist false otherwise. 574 */ 575 static inline bool of_property_read_bool(const struct device_node *np, 576 const char *propname) 577 { 578 struct property *prop = of_find_property(np, propname, NULL); 579 580 return prop ? true : false; 581 } 582 583 static inline int of_property_read_u8(const struct device_node *np, 584 const char *propname, 585 u8 *out_value) 586 { 587 return of_property_read_u8_array(np, propname, out_value, 1); 588 } 589 590 static inline int of_property_read_u16(const struct device_node *np, 591 const char *propname, 592 u16 *out_value) 593 { 594 return of_property_read_u16_array(np, propname, out_value, 1); 595 } 596 597 static inline int of_property_read_u32(const struct device_node *np, 598 const char *propname, 599 u32 *out_value) 600 { 601 return of_property_read_u32_array(np, propname, out_value, 1); 602 } 603 604 #define of_property_for_each_u32(np, propname, prop, p, u) \ 605 for (prop = of_find_property(np, propname, NULL), \ 606 p = of_prop_next_u32(prop, NULL, &u); \ 607 p; \ 608 p = of_prop_next_u32(prop, p, &u)) 609 610 #define of_property_for_each_string(np, propname, prop, s) \ 611 for (prop = of_find_property(np, propname, NULL), \ 612 s = of_prop_next_string(prop, NULL); \ 613 s; \ 614 s = of_prop_next_string(prop, s)) 615 616 #if defined(CONFIG_PROC_FS) && defined(CONFIG_PROC_DEVICETREE) 617 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *); 618 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop); 619 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde, 620 struct property *prop); 621 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde, 622 struct property *newprop, 623 struct property *oldprop); 624 #endif 625 626 #endif /* _LINUX_OF_H */ 627