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/kobject.h> 22 #include <linux/mod_devicetable.h> 23 #include <linux/spinlock.h> 24 #include <linux/topology.h> 25 #include <linux/notifier.h> 26 #include <linux/property.h> 27 #include <linux/list.h> 28 29 #include <asm/byteorder.h> 30 #include <asm/errno.h> 31 32 typedef u32 phandle; 33 typedef u32 ihandle; 34 35 struct property { 36 char *name; 37 int length; 38 void *value; 39 struct property *next; 40 unsigned long _flags; 41 unsigned int unique_id; 42 struct bin_attribute attr; 43 }; 44 45 #if defined(CONFIG_SPARC) 46 struct of_irq_controller; 47 #endif 48 49 struct device_node { 50 const char *name; 51 const char *type; 52 phandle phandle; 53 const char *full_name; 54 struct fwnode_handle fwnode; 55 56 struct property *properties; 57 struct property *deadprops; /* removed properties */ 58 struct device_node *parent; 59 struct device_node *child; 60 struct device_node *sibling; 61 struct kobject kobj; 62 unsigned long _flags; 63 void *data; 64 #if defined(CONFIG_SPARC) 65 const char *path_component_name; 66 unsigned int unique_id; 67 struct of_irq_controller *irq_trans; 68 #endif 69 }; 70 71 #define MAX_PHANDLE_ARGS 16 72 struct of_phandle_args { 73 struct device_node *np; 74 int args_count; 75 uint32_t args[MAX_PHANDLE_ARGS]; 76 }; 77 78 struct of_phandle_iterator { 79 /* Common iterator information */ 80 const char *cells_name; 81 int cell_count; 82 const struct device_node *parent; 83 84 /* List size information */ 85 const __be32 *list_end; 86 const __be32 *phandle_end; 87 88 /* Current position state */ 89 const __be32 *cur; 90 uint32_t cur_count; 91 phandle phandle; 92 struct device_node *node; 93 }; 94 95 struct of_reconfig_data { 96 struct device_node *dn; 97 struct property *prop; 98 struct property *old_prop; 99 }; 100 101 /* initialize a node */ 102 extern struct kobj_type of_node_ktype; 103 extern const struct fwnode_operations of_fwnode_ops; 104 static inline void of_node_init(struct device_node *node) 105 { 106 kobject_init(&node->kobj, &of_node_ktype); 107 node->fwnode.ops = &of_fwnode_ops; 108 } 109 110 /* true when node is initialized */ 111 static inline int of_node_is_initialized(struct device_node *node) 112 { 113 return node && node->kobj.state_initialized; 114 } 115 116 /* true when node is attached (i.e. present on sysfs) */ 117 static inline int of_node_is_attached(struct device_node *node) 118 { 119 return node && node->kobj.state_in_sysfs; 120 } 121 122 #ifdef CONFIG_OF_DYNAMIC 123 extern struct device_node *of_node_get(struct device_node *node); 124 extern void of_node_put(struct device_node *node); 125 #else /* CONFIG_OF_DYNAMIC */ 126 /* Dummy ref counting routines - to be implemented later */ 127 static inline struct device_node *of_node_get(struct device_node *node) 128 { 129 return node; 130 } 131 static inline void of_node_put(struct device_node *node) { } 132 #endif /* !CONFIG_OF_DYNAMIC */ 133 134 /* Pointer for first entry in chain of all nodes. */ 135 extern struct device_node *of_root; 136 extern struct device_node *of_chosen; 137 extern struct device_node *of_aliases; 138 extern struct device_node *of_stdout; 139 extern raw_spinlock_t devtree_lock; 140 141 /* flag descriptions (need to be visible even when !CONFIG_OF) */ 142 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */ 143 #define OF_DETACHED 2 /* node has been detached from the device tree */ 144 #define OF_POPULATED 3 /* device already created for the node */ 145 #define OF_POPULATED_BUS 4 /* of_platform_populate recursed to children of this node */ 146 147 #define OF_BAD_ADDR ((u64)-1) 148 149 #ifdef CONFIG_OF 150 void of_core_init(void); 151 152 static inline bool is_of_node(const struct fwnode_handle *fwnode) 153 { 154 return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &of_fwnode_ops; 155 } 156 157 #define to_of_node(__fwnode) \ 158 ({ \ 159 typeof(__fwnode) __to_of_node_fwnode = (__fwnode); \ 160 \ 161 is_of_node(__to_of_node_fwnode) ? \ 162 container_of(__to_of_node_fwnode, \ 163 struct device_node, fwnode) : \ 164 NULL; \ 165 }) 166 167 #define of_fwnode_handle(node) \ 168 ({ \ 169 typeof(node) __of_fwnode_handle_node = (node); \ 170 \ 171 __of_fwnode_handle_node ? \ 172 &__of_fwnode_handle_node->fwnode : NULL; \ 173 }) 174 175 static inline bool of_have_populated_dt(void) 176 { 177 return of_root != NULL; 178 } 179 180 static inline bool of_node_is_root(const struct device_node *node) 181 { 182 return node && (node->parent == NULL); 183 } 184 185 static inline int of_node_check_flag(struct device_node *n, unsigned long flag) 186 { 187 return test_bit(flag, &n->_flags); 188 } 189 190 static inline int of_node_test_and_set_flag(struct device_node *n, 191 unsigned long flag) 192 { 193 return test_and_set_bit(flag, &n->_flags); 194 } 195 196 static inline void of_node_set_flag(struct device_node *n, unsigned long flag) 197 { 198 set_bit(flag, &n->_flags); 199 } 200 201 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag) 202 { 203 clear_bit(flag, &n->_flags); 204 } 205 206 static inline int of_property_check_flag(struct property *p, unsigned long flag) 207 { 208 return test_bit(flag, &p->_flags); 209 } 210 211 static inline void of_property_set_flag(struct property *p, unsigned long flag) 212 { 213 set_bit(flag, &p->_flags); 214 } 215 216 static inline void of_property_clear_flag(struct property *p, unsigned long flag) 217 { 218 clear_bit(flag, &p->_flags); 219 } 220 221 extern struct device_node *__of_find_all_nodes(struct device_node *prev); 222 extern struct device_node *of_find_all_nodes(struct device_node *prev); 223 224 /* 225 * OF address retrieval & translation 226 */ 227 228 /* Helper to read a big number; size is in cells (not bytes) */ 229 static inline u64 of_read_number(const __be32 *cell, int size) 230 { 231 u64 r = 0; 232 while (size--) 233 r = (r << 32) | be32_to_cpu(*(cell++)); 234 return r; 235 } 236 237 /* Like of_read_number, but we want an unsigned long result */ 238 static inline unsigned long of_read_ulong(const __be32 *cell, int size) 239 { 240 /* toss away upper bits if unsigned long is smaller than u64 */ 241 return of_read_number(cell, size); 242 } 243 244 #if defined(CONFIG_SPARC) 245 #include <asm/prom.h> 246 #endif 247 248 /* Default #address and #size cells. Allow arch asm/prom.h to override */ 249 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT) 250 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1 251 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1 252 #endif 253 254 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags) 255 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags) 256 257 static inline const char *of_node_full_name(const struct device_node *np) 258 { 259 return np ? np->full_name : "<no-node>"; 260 } 261 262 #define for_each_of_allnodes_from(from, dn) \ 263 for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn)) 264 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn) 265 extern struct device_node *of_find_node_by_name(struct device_node *from, 266 const char *name); 267 extern struct device_node *of_find_node_by_type(struct device_node *from, 268 const char *type); 269 extern struct device_node *of_find_compatible_node(struct device_node *from, 270 const char *type, const char *compat); 271 extern struct device_node *of_find_matching_node_and_match( 272 struct device_node *from, 273 const struct of_device_id *matches, 274 const struct of_device_id **match); 275 276 extern struct device_node *of_find_node_opts_by_path(const char *path, 277 const char **opts); 278 static inline struct device_node *of_find_node_by_path(const char *path) 279 { 280 return of_find_node_opts_by_path(path, NULL); 281 } 282 283 extern struct device_node *of_find_node_by_phandle(phandle handle); 284 extern struct device_node *of_get_parent(const struct device_node *node); 285 extern struct device_node *of_get_next_parent(struct device_node *node); 286 extern struct device_node *of_get_next_child(const struct device_node *node, 287 struct device_node *prev); 288 extern struct device_node *of_get_next_available_child( 289 const struct device_node *node, struct device_node *prev); 290 291 extern struct device_node *of_get_child_by_name(const struct device_node *node, 292 const char *name); 293 294 /* cache lookup */ 295 extern struct device_node *of_find_next_cache_node(const struct device_node *); 296 extern int of_find_last_cache_level(unsigned int cpu); 297 extern struct device_node *of_find_node_with_property( 298 struct device_node *from, const char *prop_name); 299 300 extern struct property *of_find_property(const struct device_node *np, 301 const char *name, 302 int *lenp); 303 extern int of_property_count_elems_of_size(const struct device_node *np, 304 const char *propname, int elem_size); 305 extern int of_property_read_u32_index(const struct device_node *np, 306 const char *propname, 307 u32 index, u32 *out_value); 308 extern int of_property_read_u64_index(const struct device_node *np, 309 const char *propname, 310 u32 index, u64 *out_value); 311 extern int of_property_read_variable_u8_array(const struct device_node *np, 312 const char *propname, u8 *out_values, 313 size_t sz_min, size_t sz_max); 314 extern int of_property_read_variable_u16_array(const struct device_node *np, 315 const char *propname, u16 *out_values, 316 size_t sz_min, size_t sz_max); 317 extern int of_property_read_variable_u32_array(const struct device_node *np, 318 const char *propname, 319 u32 *out_values, 320 size_t sz_min, 321 size_t sz_max); 322 extern int of_property_read_u64(const struct device_node *np, 323 const char *propname, u64 *out_value); 324 extern int of_property_read_variable_u64_array(const struct device_node *np, 325 const char *propname, 326 u64 *out_values, 327 size_t sz_min, 328 size_t sz_max); 329 330 extern int of_property_read_string(const struct device_node *np, 331 const char *propname, 332 const char **out_string); 333 extern int of_property_match_string(const struct device_node *np, 334 const char *propname, 335 const char *string); 336 extern int of_property_read_string_helper(const struct device_node *np, 337 const char *propname, 338 const char **out_strs, size_t sz, int index); 339 extern int of_device_is_compatible(const struct device_node *device, 340 const char *); 341 extern int of_device_compatible_match(struct device_node *device, 342 const char *const *compat); 343 extern bool of_device_is_available(const struct device_node *device); 344 extern bool of_device_is_big_endian(const struct device_node *device); 345 extern const void *of_get_property(const struct device_node *node, 346 const char *name, 347 int *lenp); 348 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread); 349 #define for_each_property_of_node(dn, pp) \ 350 for (pp = dn->properties; pp != NULL; pp = pp->next) 351 352 extern int of_n_addr_cells(struct device_node *np); 353 extern int of_n_size_cells(struct device_node *np); 354 extern const struct of_device_id *of_match_node( 355 const struct of_device_id *matches, const struct device_node *node); 356 extern int of_modalias_node(struct device_node *node, char *modalias, int len); 357 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args); 358 extern struct device_node *of_parse_phandle(const struct device_node *np, 359 const char *phandle_name, 360 int index); 361 extern int of_parse_phandle_with_args(const struct device_node *np, 362 const char *list_name, const char *cells_name, int index, 363 struct of_phandle_args *out_args); 364 extern int of_parse_phandle_with_fixed_args(const struct device_node *np, 365 const char *list_name, int cells_count, int index, 366 struct of_phandle_args *out_args); 367 extern int of_count_phandle_with_args(const struct device_node *np, 368 const char *list_name, const char *cells_name); 369 370 /* phandle iterator functions */ 371 extern int of_phandle_iterator_init(struct of_phandle_iterator *it, 372 const struct device_node *np, 373 const char *list_name, 374 const char *cells_name, 375 int cell_count); 376 377 extern int of_phandle_iterator_next(struct of_phandle_iterator *it); 378 extern int of_phandle_iterator_args(struct of_phandle_iterator *it, 379 uint32_t *args, 380 int size); 381 382 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align)); 383 extern int of_alias_get_id(struct device_node *np, const char *stem); 384 extern int of_alias_get_highest_id(const char *stem); 385 386 extern int of_machine_is_compatible(const char *compat); 387 388 extern int of_add_property(struct device_node *np, struct property *prop); 389 extern int of_remove_property(struct device_node *np, struct property *prop); 390 extern int of_update_property(struct device_node *np, struct property *newprop); 391 392 /* For updating the device tree at runtime */ 393 #define OF_RECONFIG_ATTACH_NODE 0x0001 394 #define OF_RECONFIG_DETACH_NODE 0x0002 395 #define OF_RECONFIG_ADD_PROPERTY 0x0003 396 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004 397 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005 398 399 extern int of_attach_node(struct device_node *); 400 extern int of_detach_node(struct device_node *); 401 402 #define of_match_ptr(_ptr) (_ptr) 403 404 /** 405 * of_property_read_u8_array - Find and read an array of u8 from a property. 406 * 407 * @np: device node from which the property value is to be read. 408 * @propname: name of the property to be searched. 409 * @out_values: pointer to return value, modified only if return value is 0. 410 * @sz: number of array elements to read 411 * 412 * Search for a property in a device node and read 8-bit value(s) from 413 * it. Returns 0 on success, -EINVAL if the property does not exist, 414 * -ENODATA if property does not have a value, and -EOVERFLOW if the 415 * property data isn't large enough. 416 * 417 * dts entry of array should be like: 418 * property = /bits/ 8 <0x50 0x60 0x70>; 419 * 420 * The out_values is modified only if a valid u8 value can be decoded. 421 */ 422 static inline int of_property_read_u8_array(const struct device_node *np, 423 const char *propname, 424 u8 *out_values, size_t sz) 425 { 426 int ret = of_property_read_variable_u8_array(np, propname, out_values, 427 sz, 0); 428 if (ret >= 0) 429 return 0; 430 else 431 return ret; 432 } 433 434 /** 435 * of_property_read_u16_array - Find and read an array of u16 from a property. 436 * 437 * @np: device node from which the property value is to be read. 438 * @propname: name of the property to be searched. 439 * @out_values: pointer to return value, modified only if return value is 0. 440 * @sz: number of array elements to read 441 * 442 * Search for a property in a device node and read 16-bit value(s) from 443 * it. Returns 0 on success, -EINVAL if the property does not exist, 444 * -ENODATA if property does not have a value, and -EOVERFLOW if the 445 * property data isn't large enough. 446 * 447 * dts entry of array should be like: 448 * property = /bits/ 16 <0x5000 0x6000 0x7000>; 449 * 450 * The out_values is modified only if a valid u16 value can be decoded. 451 */ 452 static inline int of_property_read_u16_array(const struct device_node *np, 453 const char *propname, 454 u16 *out_values, size_t sz) 455 { 456 int ret = of_property_read_variable_u16_array(np, propname, out_values, 457 sz, 0); 458 if (ret >= 0) 459 return 0; 460 else 461 return ret; 462 } 463 464 /** 465 * of_property_read_u32_array - Find and read an array of 32 bit integers 466 * from a property. 467 * 468 * @np: device node from which the property value is to be read. 469 * @propname: name of the property to be searched. 470 * @out_values: pointer to return value, modified only if return value is 0. 471 * @sz: number of array elements to read 472 * 473 * Search for a property in a device node and read 32-bit value(s) from 474 * it. Returns 0 on success, -EINVAL if the property does not exist, 475 * -ENODATA if property does not have a value, and -EOVERFLOW if the 476 * property data isn't large enough. 477 * 478 * The out_values is modified only if a valid u32 value can be decoded. 479 */ 480 static inline int of_property_read_u32_array(const struct device_node *np, 481 const char *propname, 482 u32 *out_values, size_t sz) 483 { 484 int ret = of_property_read_variable_u32_array(np, propname, out_values, 485 sz, 0); 486 if (ret >= 0) 487 return 0; 488 else 489 return ret; 490 } 491 492 /** 493 * of_property_read_u64_array - Find and read an array of 64 bit integers 494 * from a property. 495 * 496 * @np: device node from which the property value is to be read. 497 * @propname: name of the property to be searched. 498 * @out_values: pointer to return value, modified only if return value is 0. 499 * @sz: number of array elements to read 500 * 501 * Search for a property in a device node and read 64-bit value(s) from 502 * it. Returns 0 on success, -EINVAL if the property does not exist, 503 * -ENODATA if property does not have a value, and -EOVERFLOW if the 504 * property data isn't large enough. 505 * 506 * The out_values is modified only if a valid u64 value can be decoded. 507 */ 508 static inline int of_property_read_u64_array(const struct device_node *np, 509 const char *propname, 510 u64 *out_values, size_t sz) 511 { 512 int ret = of_property_read_variable_u64_array(np, propname, out_values, 513 sz, 0); 514 if (ret >= 0) 515 return 0; 516 else 517 return ret; 518 } 519 520 /* 521 * struct property *prop; 522 * const __be32 *p; 523 * u32 u; 524 * 525 * of_property_for_each_u32(np, "propname", prop, p, u) 526 * printk("U32 value: %x\n", u); 527 */ 528 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur, 529 u32 *pu); 530 /* 531 * struct property *prop; 532 * const char *s; 533 * 534 * of_property_for_each_string(np, "propname", prop, s) 535 * printk("String value: %s\n", s); 536 */ 537 const char *of_prop_next_string(struct property *prop, const char *cur); 538 539 bool of_console_check(struct device_node *dn, char *name, int index); 540 541 #else /* CONFIG_OF */ 542 543 static inline void of_core_init(void) 544 { 545 } 546 547 static inline bool is_of_node(const struct fwnode_handle *fwnode) 548 { 549 return false; 550 } 551 552 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode) 553 { 554 return NULL; 555 } 556 557 static inline const char* of_node_full_name(const struct device_node *np) 558 { 559 return "<no-node>"; 560 } 561 562 static inline struct device_node *of_find_node_by_name(struct device_node *from, 563 const char *name) 564 { 565 return NULL; 566 } 567 568 static inline struct device_node *of_find_node_by_type(struct device_node *from, 569 const char *type) 570 { 571 return NULL; 572 } 573 574 static inline struct device_node *of_find_matching_node_and_match( 575 struct device_node *from, 576 const struct of_device_id *matches, 577 const struct of_device_id **match) 578 { 579 return NULL; 580 } 581 582 static inline struct device_node *of_find_node_by_path(const char *path) 583 { 584 return NULL; 585 } 586 587 static inline struct device_node *of_find_node_opts_by_path(const char *path, 588 const char **opts) 589 { 590 return NULL; 591 } 592 593 static inline struct device_node *of_find_node_by_phandle(phandle handle) 594 { 595 return NULL; 596 } 597 598 static inline struct device_node *of_get_parent(const struct device_node *node) 599 { 600 return NULL; 601 } 602 603 static inline struct device_node *of_get_next_child( 604 const struct device_node *node, struct device_node *prev) 605 { 606 return NULL; 607 } 608 609 static inline struct device_node *of_get_next_available_child( 610 const struct device_node *node, struct device_node *prev) 611 { 612 return NULL; 613 } 614 615 static inline struct device_node *of_find_node_with_property( 616 struct device_node *from, const char *prop_name) 617 { 618 return NULL; 619 } 620 621 #define of_fwnode_handle(node) NULL 622 623 static inline bool of_have_populated_dt(void) 624 { 625 return false; 626 } 627 628 static inline struct device_node *of_get_child_by_name( 629 const struct device_node *node, 630 const char *name) 631 { 632 return NULL; 633 } 634 635 static inline int of_device_is_compatible(const struct device_node *device, 636 const char *name) 637 { 638 return 0; 639 } 640 641 static inline int of_device_compatible_match(struct device_node *device, 642 const char *const *compat) 643 { 644 return 0; 645 } 646 647 static inline bool of_device_is_available(const struct device_node *device) 648 { 649 return false; 650 } 651 652 static inline bool of_device_is_big_endian(const struct device_node *device) 653 { 654 return false; 655 } 656 657 static inline struct property *of_find_property(const struct device_node *np, 658 const char *name, 659 int *lenp) 660 { 661 return NULL; 662 } 663 664 static inline struct device_node *of_find_compatible_node( 665 struct device_node *from, 666 const char *type, 667 const char *compat) 668 { 669 return NULL; 670 } 671 672 static inline int of_property_count_elems_of_size(const struct device_node *np, 673 const char *propname, int elem_size) 674 { 675 return -ENOSYS; 676 } 677 678 static inline int of_property_read_u8_array(const struct device_node *np, 679 const char *propname, u8 *out_values, size_t sz) 680 { 681 return -ENOSYS; 682 } 683 684 static inline int of_property_read_u16_array(const struct device_node *np, 685 const char *propname, u16 *out_values, size_t sz) 686 { 687 return -ENOSYS; 688 } 689 690 static inline int of_property_read_u32_array(const struct device_node *np, 691 const char *propname, 692 u32 *out_values, size_t sz) 693 { 694 return -ENOSYS; 695 } 696 697 static inline int of_property_read_u64_array(const struct device_node *np, 698 const char *propname, 699 u64 *out_values, size_t sz) 700 { 701 return -ENOSYS; 702 } 703 704 static inline int of_property_read_u32_index(const struct device_node *np, 705 const char *propname, u32 index, u32 *out_value) 706 { 707 return -ENOSYS; 708 } 709 710 static inline int of_property_read_u64_index(const struct device_node *np, 711 const char *propname, u32 index, u64 *out_value) 712 { 713 return -ENOSYS; 714 } 715 716 static inline const void *of_get_property(const struct device_node *node, 717 const char *name, 718 int *lenp) 719 { 720 return NULL; 721 } 722 723 static inline struct device_node *of_get_cpu_node(int cpu, 724 unsigned int *thread) 725 { 726 return NULL; 727 } 728 729 static inline int of_n_addr_cells(struct device_node *np) 730 { 731 return 0; 732 733 } 734 static inline int of_n_size_cells(struct device_node *np) 735 { 736 return 0; 737 } 738 739 static inline int of_property_read_variable_u8_array(const struct device_node *np, 740 const char *propname, u8 *out_values, 741 size_t sz_min, size_t sz_max) 742 { 743 return -ENOSYS; 744 } 745 746 static inline int of_property_read_variable_u16_array(const struct device_node *np, 747 const char *propname, u16 *out_values, 748 size_t sz_min, size_t sz_max) 749 { 750 return -ENOSYS; 751 } 752 753 static inline int of_property_read_variable_u32_array(const struct device_node *np, 754 const char *propname, 755 u32 *out_values, 756 size_t sz_min, 757 size_t sz_max) 758 { 759 return -ENOSYS; 760 } 761 762 static inline int of_property_read_u64(const struct device_node *np, 763 const char *propname, u64 *out_value) 764 { 765 return -ENOSYS; 766 } 767 768 static inline int of_property_read_variable_u64_array(const struct device_node *np, 769 const char *propname, 770 u64 *out_values, 771 size_t sz_min, 772 size_t sz_max) 773 { 774 return -ENOSYS; 775 } 776 777 static inline int of_property_read_string(const struct device_node *np, 778 const char *propname, 779 const char **out_string) 780 { 781 return -ENOSYS; 782 } 783 784 static inline int of_property_match_string(const struct device_node *np, 785 const char *propname, 786 const char *string) 787 { 788 return -ENOSYS; 789 } 790 791 static inline int of_property_read_string_helper(const struct device_node *np, 792 const char *propname, 793 const char **out_strs, size_t sz, int index) 794 { 795 return -ENOSYS; 796 } 797 798 static inline struct device_node *of_parse_phandle(const struct device_node *np, 799 const char *phandle_name, 800 int index) 801 { 802 return NULL; 803 } 804 805 static inline int of_parse_phandle_with_args(const struct device_node *np, 806 const char *list_name, 807 const char *cells_name, 808 int index, 809 struct of_phandle_args *out_args) 810 { 811 return -ENOSYS; 812 } 813 814 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np, 815 const char *list_name, int cells_count, int index, 816 struct of_phandle_args *out_args) 817 { 818 return -ENOSYS; 819 } 820 821 static inline int of_count_phandle_with_args(struct device_node *np, 822 const char *list_name, 823 const char *cells_name) 824 { 825 return -ENOSYS; 826 } 827 828 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it, 829 const struct device_node *np, 830 const char *list_name, 831 const char *cells_name, 832 int cell_count) 833 { 834 return -ENOSYS; 835 } 836 837 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it) 838 { 839 return -ENOSYS; 840 } 841 842 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it, 843 uint32_t *args, 844 int size) 845 { 846 return 0; 847 } 848 849 static inline int of_alias_get_id(struct device_node *np, const char *stem) 850 { 851 return -ENOSYS; 852 } 853 854 static inline int of_alias_get_highest_id(const char *stem) 855 { 856 return -ENOSYS; 857 } 858 859 static inline int of_machine_is_compatible(const char *compat) 860 { 861 return 0; 862 } 863 864 static inline bool of_console_check(const struct device_node *dn, const char *name, int index) 865 { 866 return false; 867 } 868 869 static inline const __be32 *of_prop_next_u32(struct property *prop, 870 const __be32 *cur, u32 *pu) 871 { 872 return NULL; 873 } 874 875 static inline const char *of_prop_next_string(struct property *prop, 876 const char *cur) 877 { 878 return NULL; 879 } 880 881 static inline int of_node_check_flag(struct device_node *n, unsigned long flag) 882 { 883 return 0; 884 } 885 886 static inline int of_node_test_and_set_flag(struct device_node *n, 887 unsigned long flag) 888 { 889 return 0; 890 } 891 892 static inline void of_node_set_flag(struct device_node *n, unsigned long flag) 893 { 894 } 895 896 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag) 897 { 898 } 899 900 static inline int of_property_check_flag(struct property *p, unsigned long flag) 901 { 902 return 0; 903 } 904 905 static inline void of_property_set_flag(struct property *p, unsigned long flag) 906 { 907 } 908 909 static inline void of_property_clear_flag(struct property *p, unsigned long flag) 910 { 911 } 912 913 #define of_match_ptr(_ptr) NULL 914 #define of_match_node(_matches, _node) NULL 915 #endif /* CONFIG_OF */ 916 917 /* Default string compare functions, Allow arch asm/prom.h to override */ 918 #if !defined(of_compat_cmp) 919 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2)) 920 #define of_prop_cmp(s1, s2) strcmp((s1), (s2)) 921 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2)) 922 #endif 923 924 #if defined(CONFIG_OF) && defined(CONFIG_NUMA) 925 extern int of_node_to_nid(struct device_node *np); 926 #else 927 static inline int of_node_to_nid(struct device_node *device) 928 { 929 return NUMA_NO_NODE; 930 } 931 #endif 932 933 #ifdef CONFIG_OF_NUMA 934 extern int of_numa_init(void); 935 #else 936 static inline int of_numa_init(void) 937 { 938 return -ENOSYS; 939 } 940 #endif 941 942 static inline struct device_node *of_find_matching_node( 943 struct device_node *from, 944 const struct of_device_id *matches) 945 { 946 return of_find_matching_node_and_match(from, matches, NULL); 947 } 948 949 /** 950 * of_property_count_u8_elems - Count the number of u8 elements in a property 951 * 952 * @np: device node from which the property value is to be read. 953 * @propname: name of the property to be searched. 954 * 955 * Search for a property in a device node and count the number of u8 elements 956 * in it. Returns number of elements on sucess, -EINVAL if the property does 957 * not exist or its length does not match a multiple of u8 and -ENODATA if the 958 * property does not have a value. 959 */ 960 static inline int of_property_count_u8_elems(const struct device_node *np, 961 const char *propname) 962 { 963 return of_property_count_elems_of_size(np, propname, sizeof(u8)); 964 } 965 966 /** 967 * of_property_count_u16_elems - Count the number of u16 elements in a property 968 * 969 * @np: device node from which the property value is to be read. 970 * @propname: name of the property to be searched. 971 * 972 * Search for a property in a device node and count the number of u16 elements 973 * in it. Returns number of elements on sucess, -EINVAL if the property does 974 * not exist or its length does not match a multiple of u16 and -ENODATA if the 975 * property does not have a value. 976 */ 977 static inline int of_property_count_u16_elems(const struct device_node *np, 978 const char *propname) 979 { 980 return of_property_count_elems_of_size(np, propname, sizeof(u16)); 981 } 982 983 /** 984 * of_property_count_u32_elems - Count the number of u32 elements in a property 985 * 986 * @np: device node from which the property value is to be read. 987 * @propname: name of the property to be searched. 988 * 989 * Search for a property in a device node and count the number of u32 elements 990 * in it. Returns number of elements on sucess, -EINVAL if the property does 991 * not exist or its length does not match a multiple of u32 and -ENODATA if the 992 * property does not have a value. 993 */ 994 static inline int of_property_count_u32_elems(const struct device_node *np, 995 const char *propname) 996 { 997 return of_property_count_elems_of_size(np, propname, sizeof(u32)); 998 } 999 1000 /** 1001 * of_property_count_u64_elems - Count the number of u64 elements in a property 1002 * 1003 * @np: device node from which the property value is to be read. 1004 * @propname: name of the property to be searched. 1005 * 1006 * Search for a property in a device node and count the number of u64 elements 1007 * in it. Returns number of elements on sucess, -EINVAL if the property does 1008 * not exist or its length does not match a multiple of u64 and -ENODATA if the 1009 * property does not have a value. 1010 */ 1011 static inline int of_property_count_u64_elems(const struct device_node *np, 1012 const char *propname) 1013 { 1014 return of_property_count_elems_of_size(np, propname, sizeof(u64)); 1015 } 1016 1017 /** 1018 * of_property_read_string_array() - Read an array of strings from a multiple 1019 * strings property. 1020 * @np: device node from which the property value is to be read. 1021 * @propname: name of the property to be searched. 1022 * @out_strs: output array of string pointers. 1023 * @sz: number of array elements to read. 1024 * 1025 * Search for a property in a device tree node and retrieve a list of 1026 * terminated string values (pointer to data, not a copy) in that property. 1027 * 1028 * If @out_strs is NULL, the number of strings in the property is returned. 1029 */ 1030 static inline int of_property_read_string_array(const struct device_node *np, 1031 const char *propname, const char **out_strs, 1032 size_t sz) 1033 { 1034 return of_property_read_string_helper(np, propname, out_strs, sz, 0); 1035 } 1036 1037 /** 1038 * of_property_count_strings() - Find and return the number of strings from a 1039 * multiple strings property. 1040 * @np: device node from which the property value is to be read. 1041 * @propname: name of the property to be searched. 1042 * 1043 * Search for a property in a device tree node and retrieve the number of null 1044 * terminated string contain in it. Returns the number of strings on 1045 * success, -EINVAL if the property does not exist, -ENODATA if property 1046 * does not have a value, and -EILSEQ if the string is not null-terminated 1047 * within the length of the property data. 1048 */ 1049 static inline int of_property_count_strings(const struct device_node *np, 1050 const char *propname) 1051 { 1052 return of_property_read_string_helper(np, propname, NULL, 0, 0); 1053 } 1054 1055 /** 1056 * of_property_read_string_index() - Find and read a string from a multiple 1057 * strings property. 1058 * @np: device node from which the property value is to be read. 1059 * @propname: name of the property to be searched. 1060 * @index: index of the string in the list of strings 1061 * @out_string: pointer to null terminated return string, modified only if 1062 * return value is 0. 1063 * 1064 * Search for a property in a device tree node and retrieve a null 1065 * terminated string value (pointer to data, not a copy) in the list of strings 1066 * contained in that property. 1067 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if 1068 * property does not have a value, and -EILSEQ if the string is not 1069 * null-terminated within the length of the property data. 1070 * 1071 * The out_string pointer is modified only if a valid string can be decoded. 1072 */ 1073 static inline int of_property_read_string_index(const struct device_node *np, 1074 const char *propname, 1075 int index, const char **output) 1076 { 1077 int rc = of_property_read_string_helper(np, propname, output, 1, index); 1078 return rc < 0 ? rc : 0; 1079 } 1080 1081 /** 1082 * of_property_read_bool - Findfrom a property 1083 * @np: device node from which the property value is to be read. 1084 * @propname: name of the property to be searched. 1085 * 1086 * Search for a property in a device node. 1087 * Returns true if the property exists false otherwise. 1088 */ 1089 static inline bool of_property_read_bool(const struct device_node *np, 1090 const char *propname) 1091 { 1092 struct property *prop = of_find_property(np, propname, NULL); 1093 1094 return prop ? true : false; 1095 } 1096 1097 static inline int of_property_read_u8(const struct device_node *np, 1098 const char *propname, 1099 u8 *out_value) 1100 { 1101 return of_property_read_u8_array(np, propname, out_value, 1); 1102 } 1103 1104 static inline int of_property_read_u16(const struct device_node *np, 1105 const char *propname, 1106 u16 *out_value) 1107 { 1108 return of_property_read_u16_array(np, propname, out_value, 1); 1109 } 1110 1111 static inline int of_property_read_u32(const struct device_node *np, 1112 const char *propname, 1113 u32 *out_value) 1114 { 1115 return of_property_read_u32_array(np, propname, out_value, 1); 1116 } 1117 1118 static inline int of_property_read_s32(const struct device_node *np, 1119 const char *propname, 1120 s32 *out_value) 1121 { 1122 return of_property_read_u32(np, propname, (u32*) out_value); 1123 } 1124 1125 #define of_for_each_phandle(it, err, np, ln, cn, cc) \ 1126 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \ 1127 err = of_phandle_iterator_next(it); \ 1128 err == 0; \ 1129 err = of_phandle_iterator_next(it)) 1130 1131 #define of_property_for_each_u32(np, propname, prop, p, u) \ 1132 for (prop = of_find_property(np, propname, NULL), \ 1133 p = of_prop_next_u32(prop, NULL, &u); \ 1134 p; \ 1135 p = of_prop_next_u32(prop, p, &u)) 1136 1137 #define of_property_for_each_string(np, propname, prop, s) \ 1138 for (prop = of_find_property(np, propname, NULL), \ 1139 s = of_prop_next_string(prop, NULL); \ 1140 s; \ 1141 s = of_prop_next_string(prop, s)) 1142 1143 #define for_each_node_by_name(dn, name) \ 1144 for (dn = of_find_node_by_name(NULL, name); dn; \ 1145 dn = of_find_node_by_name(dn, name)) 1146 #define for_each_node_by_type(dn, type) \ 1147 for (dn = of_find_node_by_type(NULL, type); dn; \ 1148 dn = of_find_node_by_type(dn, type)) 1149 #define for_each_compatible_node(dn, type, compatible) \ 1150 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \ 1151 dn = of_find_compatible_node(dn, type, compatible)) 1152 #define for_each_matching_node(dn, matches) \ 1153 for (dn = of_find_matching_node(NULL, matches); dn; \ 1154 dn = of_find_matching_node(dn, matches)) 1155 #define for_each_matching_node_and_match(dn, matches, match) \ 1156 for (dn = of_find_matching_node_and_match(NULL, matches, match); \ 1157 dn; dn = of_find_matching_node_and_match(dn, matches, match)) 1158 1159 #define for_each_child_of_node(parent, child) \ 1160 for (child = of_get_next_child(parent, NULL); child != NULL; \ 1161 child = of_get_next_child(parent, child)) 1162 #define for_each_available_child_of_node(parent, child) \ 1163 for (child = of_get_next_available_child(parent, NULL); child != NULL; \ 1164 child = of_get_next_available_child(parent, child)) 1165 1166 #define for_each_node_with_property(dn, prop_name) \ 1167 for (dn = of_find_node_with_property(NULL, prop_name); dn; \ 1168 dn = of_find_node_with_property(dn, prop_name)) 1169 1170 static inline int of_get_child_count(const struct device_node *np) 1171 { 1172 struct device_node *child; 1173 int num = 0; 1174 1175 for_each_child_of_node(np, child) 1176 num++; 1177 1178 return num; 1179 } 1180 1181 static inline int of_get_available_child_count(const struct device_node *np) 1182 { 1183 struct device_node *child; 1184 int num = 0; 1185 1186 for_each_available_child_of_node(np, child) 1187 num++; 1188 1189 return num; 1190 } 1191 1192 #if defined(CONFIG_OF) && !defined(MODULE) 1193 #define _OF_DECLARE(table, name, compat, fn, fn_type) \ 1194 static const struct of_device_id __of_table_##name \ 1195 __used __section(__##table##_of_table) \ 1196 = { .compatible = compat, \ 1197 .data = (fn == (fn_type)NULL) ? fn : fn } 1198 #else 1199 #define _OF_DECLARE(table, name, compat, fn, fn_type) \ 1200 static const struct of_device_id __of_table_##name \ 1201 __attribute__((unused)) \ 1202 = { .compatible = compat, \ 1203 .data = (fn == (fn_type)NULL) ? fn : fn } 1204 #endif 1205 1206 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *); 1207 typedef int (*of_init_fn_1_ret)(struct device_node *); 1208 typedef void (*of_init_fn_1)(struct device_node *); 1209 1210 #define OF_DECLARE_1(table, name, compat, fn) \ 1211 _OF_DECLARE(table, name, compat, fn, of_init_fn_1) 1212 #define OF_DECLARE_1_RET(table, name, compat, fn) \ 1213 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret) 1214 #define OF_DECLARE_2(table, name, compat, fn) \ 1215 _OF_DECLARE(table, name, compat, fn, of_init_fn_2) 1216 1217 /** 1218 * struct of_changeset_entry - Holds a changeset entry 1219 * 1220 * @node: list_head for the log list 1221 * @action: notifier action 1222 * @np: pointer to the device node affected 1223 * @prop: pointer to the property affected 1224 * @old_prop: hold a pointer to the original property 1225 * 1226 * Every modification of the device tree during a changeset 1227 * is held in a list of of_changeset_entry structures. 1228 * That way we can recover from a partial application, or we can 1229 * revert the changeset 1230 */ 1231 struct of_changeset_entry { 1232 struct list_head node; 1233 unsigned long action; 1234 struct device_node *np; 1235 struct property *prop; 1236 struct property *old_prop; 1237 }; 1238 1239 /** 1240 * struct of_changeset - changeset tracker structure 1241 * 1242 * @entries: list_head for the changeset entries 1243 * 1244 * changesets are a convenient way to apply bulk changes to the 1245 * live tree. In case of an error, changes are rolled-back. 1246 * changesets live on after initial application, and if not 1247 * destroyed after use, they can be reverted in one single call. 1248 */ 1249 struct of_changeset { 1250 struct list_head entries; 1251 }; 1252 1253 enum of_reconfig_change { 1254 OF_RECONFIG_NO_CHANGE = 0, 1255 OF_RECONFIG_CHANGE_ADD, 1256 OF_RECONFIG_CHANGE_REMOVE, 1257 }; 1258 1259 #ifdef CONFIG_OF_DYNAMIC 1260 extern int of_reconfig_notifier_register(struct notifier_block *); 1261 extern int of_reconfig_notifier_unregister(struct notifier_block *); 1262 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd); 1263 extern int of_reconfig_get_state_change(unsigned long action, 1264 struct of_reconfig_data *arg); 1265 1266 extern void of_changeset_init(struct of_changeset *ocs); 1267 extern void of_changeset_destroy(struct of_changeset *ocs); 1268 extern int of_changeset_apply(struct of_changeset *ocs); 1269 extern int of_changeset_revert(struct of_changeset *ocs); 1270 extern int of_changeset_action(struct of_changeset *ocs, 1271 unsigned long action, struct device_node *np, 1272 struct property *prop); 1273 1274 static inline int of_changeset_attach_node(struct of_changeset *ocs, 1275 struct device_node *np) 1276 { 1277 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL); 1278 } 1279 1280 static inline int of_changeset_detach_node(struct of_changeset *ocs, 1281 struct device_node *np) 1282 { 1283 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL); 1284 } 1285 1286 static inline int of_changeset_add_property(struct of_changeset *ocs, 1287 struct device_node *np, struct property *prop) 1288 { 1289 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop); 1290 } 1291 1292 static inline int of_changeset_remove_property(struct of_changeset *ocs, 1293 struct device_node *np, struct property *prop) 1294 { 1295 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop); 1296 } 1297 1298 static inline int of_changeset_update_property(struct of_changeset *ocs, 1299 struct device_node *np, struct property *prop) 1300 { 1301 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop); 1302 } 1303 #else /* CONFIG_OF_DYNAMIC */ 1304 static inline int of_reconfig_notifier_register(struct notifier_block *nb) 1305 { 1306 return -EINVAL; 1307 } 1308 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb) 1309 { 1310 return -EINVAL; 1311 } 1312 static inline int of_reconfig_notify(unsigned long action, 1313 struct of_reconfig_data *arg) 1314 { 1315 return -EINVAL; 1316 } 1317 static inline int of_reconfig_get_state_change(unsigned long action, 1318 struct of_reconfig_data *arg) 1319 { 1320 return -EINVAL; 1321 } 1322 #endif /* CONFIG_OF_DYNAMIC */ 1323 1324 /* CONFIG_OF_RESOLVE api */ 1325 extern int of_resolve_phandles(struct device_node *tree); 1326 1327 /** 1328 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node 1329 * @np: Pointer to the given device_node 1330 * 1331 * return true if present false otherwise 1332 */ 1333 static inline bool of_device_is_system_power_controller(const struct device_node *np) 1334 { 1335 return of_property_read_bool(np, "system-power-controller"); 1336 } 1337 1338 /** 1339 * Overlay support 1340 */ 1341 1342 enum of_overlay_notify_action { 1343 OF_OVERLAY_PRE_APPLY, 1344 OF_OVERLAY_POST_APPLY, 1345 OF_OVERLAY_PRE_REMOVE, 1346 OF_OVERLAY_POST_REMOVE, 1347 }; 1348 1349 struct of_overlay_notify_data { 1350 struct device_node *overlay; 1351 struct device_node *target; 1352 }; 1353 1354 #ifdef CONFIG_OF_OVERLAY 1355 1356 /* ID based overlays; the API for external users */ 1357 int of_overlay_create(struct device_node *tree); 1358 int of_overlay_destroy(int id); 1359 int of_overlay_destroy_all(void); 1360 1361 int of_overlay_notifier_register(struct notifier_block *nb); 1362 int of_overlay_notifier_unregister(struct notifier_block *nb); 1363 1364 #else 1365 1366 static inline int of_overlay_create(struct device_node *tree) 1367 { 1368 return -ENOTSUPP; 1369 } 1370 1371 static inline int of_overlay_destroy(int id) 1372 { 1373 return -ENOTSUPP; 1374 } 1375 1376 static inline int of_overlay_destroy_all(void) 1377 { 1378 return -ENOTSUPP; 1379 } 1380 1381 static inline int of_overlay_notifier_register(struct notifier_block *nb) 1382 { 1383 return 0; 1384 } 1385 1386 static inline int of_overlay_notifier_unregister(struct notifier_block *nb) 1387 { 1388 return 0; 1389 } 1390 1391 #endif 1392 1393 #endif /* _LINUX_OF_H */ 1394