include/linux/of.h

   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
  26 #include <asm/byteorder.h>
  27 #include <asm/errno.h>
  28
  29 typedef u32 phandle;
  30 typedef u32 ihandle;
  31
  32 struct property {
  33         char    *name;
  34         int     length;
  35         void    *value;
  36         struct property *next;
  37         unsigned long _flags;
  38         unsigned int unique_id;
  39 };
  40
  41 #if defined(CONFIG_SPARC)
  42 struct of_irq_controller;
  43 #endif
  44
  45 struct device_node {
  46         const char *name;
  47         const char *type;
  48         phandle phandle;
  49         char    *full_name;
  50
  51         struct  property *properties;
  52         struct  property *deadprops;    /* removed properties */
  53         struct  device_node *parent;
  54         struct  device_node *child;
  55         struct  device_node *sibling;
  56         struct  device_node *next;      /* next device of same type */
  57         struct  device_node *allnext;   /* next in list of all nodes */
  58         struct  proc_dir_entry *pde;    /* this node's proc directory */
  59         struct  kref kref;
  60         unsigned long _flags;
  61         void    *data;
  62 #if defined(CONFIG_SPARC)
  63         char    *path_component_name;
  64         unsigned int unique_id;
  65         struct of_irq_controller *irq_trans;
  66 #endif
  67 };
  68
  69 #define MAX_PHANDLE_ARGS 8
  70 struct of_phandle_args {
  71         struct device_node *np;
  72         int args_count;
  73         uint32_t args[MAX_PHANDLE_ARGS];
  74 };
  75
  76 #ifdef CONFIG_OF_DYNAMIC
  77 extern struct device_node *of_node_get(struct device_node *node);
  78 extern void of_node_put(struct device_node *node);
  79 #else /* CONFIG_OF_DYNAMIC */
  80 /* Dummy ref counting routines - to be implemented later */
  81 static inline struct device_node *of_node_get(struct device_node *node)
  82 {
  83         return node;
  84 }
  85 static inline void of_node_put(struct device_node *node) { }
  86 #endif /* !CONFIG_OF_DYNAMIC */
  87
  88 #ifdef CONFIG_OF
  89
  90 /* Pointer for first entry in chain of all nodes. */
  91 extern struct device_node *allnodes;
  92 extern struct device_node *of_chosen;
  93 extern struct device_node *of_aliases;
  94 extern rwlock_t devtree_lock;
  95
  96 static inline bool of_have_populated_dt(void)
  97 {
  98         return allnodes != NULL;
  99 }
 100
 101 static inline bool of_node_is_root(const struct device_node *node)
 102 {
 103         return node && (node->parent == NULL);
 104 }
 105
 106 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
 107 {
 108         return test_bit(flag, &n->_flags);
 109 }
 110
 111 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
 112 {
 113         set_bit(flag, &n->_flags);
 114 }
 115
 116 extern struct device_node *of_find_all_nodes(struct device_node *prev);
 117
 118 /*
 119  * OF address retrieval & translation
 120  */
 121
 122 /* Helper to read a big number; size is in cells (not bytes) */
 123 static inline u64 of_read_number(const __be32 *cell, int size)
 124 {
 125         u64 r = 0;
 126         while (size--)
 127                 r = (r << 32) | be32_to_cpu(*(cell++));
 128         return r;
 129 }
 130
 131 /* Like of_read_number, but we want an unsigned long result */
 132 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 133 {
 134         /* toss away upper bits if unsigned long is smaller than u64 */
 135         return of_read_number(cell, size);
 136 }
 137
 138 #include <asm/prom.h>
 139
 140 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 141 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 142 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 143 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 144 #endif
 145
 146 /* Default string compare functions, Allow arch asm/prom.h to override */
 147 #if !defined(of_compat_cmp)
 148 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 149 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 150 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 151 #endif
 152
 153 /* flag descriptions */
 154 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 155 #define OF_DETACHED     2 /* node has been detached from the device tree */
 156
 157 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 158 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 159
 160 #define OF_BAD_ADDR     ((u64)-1)
 161
 162 static inline const char* of_node_full_name(struct device_node *np)
 163 {
 164         return np ? np->full_name : "<no-node>";
 165 }
 166
 167 extern struct device_node *of_find_node_by_name(struct device_node *from,
 168         const char *name);
 169 #define for_each_node_by_name(dn, name) \
 170         for (dn = of_find_node_by_name(NULL, name); dn; \
 171              dn = of_find_node_by_name(dn, name))
 172 extern struct device_node *of_find_node_by_type(struct device_node *from,
 173         const char *type);
 174 #define for_each_node_by_type(dn, type) \
 175         for (dn = of_find_node_by_type(NULL, type); dn; \
 176              dn = of_find_node_by_type(dn, type))
 177 extern struct device_node *of_find_compatible_node(struct device_node *from,
 178         const char *type, const char *compat);
 179 #define for_each_compatible_node(dn, type, compatible) \
 180         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 181              dn = of_find_compatible_node(dn, type, compatible))
 182 extern struct device_node *of_find_matching_node(struct device_node *from,
 183         const struct of_device_id *matches);
 184 #define for_each_matching_node(dn, matches) \
 185         for (dn = of_find_matching_node(NULL, matches); dn; \
 186              dn = of_find_matching_node(dn, matches))
 187 extern struct device_node *of_find_node_by_path(const char *path);
 188 extern struct device_node *of_find_node_by_phandle(phandle handle);
 189 extern struct device_node *of_get_parent(const struct device_node *node);
 190 extern struct device_node *of_get_next_parent(struct device_node *node);
 191 extern struct device_node *of_get_next_child(const struct device_node *node,
 192                                              struct device_node *prev);
 193 extern struct device_node *of_get_next_available_child(
 194         const struct device_node *node, struct device_node *prev);
 195
 196 extern struct device_node *of_get_child_by_name(const struct device_node *node,
 197                                         const char *name);
 198 #define for_each_child_of_node(parent, child) \
 199         for (child = of_get_next_child(parent, NULL); child != NULL; \
 200              child = of_get_next_child(parent, child))
 201
 202 #define for_each_available_child_of_node(parent, child) \
 203         for (child = of_get_next_available_child(parent, NULL); child != NULL; \
 204              child = of_get_next_available_child(parent, child))
 205
 206 static inline int of_get_child_count(const struct device_node *np)
 207 {
 208         struct device_node *child;
 209         int num = 0;
 210
 211         for_each_child_of_node(np, child)
 212                 num++;
 213
 214         return num;
 215 }
 216
 217 extern struct device_node *of_find_node_with_property(
 218         struct device_node *from, const char *prop_name);
 219 #define for_each_node_with_property(dn, prop_name) \
 220         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 221              dn = of_find_node_with_property(dn, prop_name))
 222
 223 extern struct property *of_find_property(const struct device_node *np,
 224                                          const char *name,
 225                                          int *lenp);
 226 extern int of_property_read_u32_array(const struct device_node *np,
 227                                       const char *propname,
 228                                       u32 *out_values,
 229                                       size_t sz);
 230 extern int of_property_read_u64(const struct device_node *np,
 231                                 const char *propname, u64 *out_value);
 232
 233 extern int of_property_read_string(struct device_node *np,
 234                                    const char *propname,
 235                                    const char **out_string);
 236 extern int of_property_read_string_index(struct device_node *np,
 237                                          const char *propname,
 238                                          int index, const char **output);
 239 extern int of_property_match_string(struct device_node *np,
 240                                     const char *propname,
 241                                     const char *string);
 242 extern int of_property_count_strings(struct device_node *np,
 243                                      const char *propname);
 244 extern int of_device_is_compatible(const struct device_node *device,
 245                                    const char *);
 246 extern int of_device_is_available(const struct device_node *device);
 247 extern const void *of_get_property(const struct device_node *node,
 248                                 const char *name,
 249                                 int *lenp);
 250 #define for_each_property_of_node(dn, pp) \
 251         for (pp = dn->properties; pp != NULL; pp = pp->next)
 252
 253 extern int of_n_addr_cells(struct device_node *np);
 254 extern int of_n_size_cells(struct device_node *np);
 255 extern const struct of_device_id *of_match_node(
 256         const struct of_device_id *matches, const struct device_node *node);
 257 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 258 extern struct device_node *of_parse_phandle(struct device_node *np,
 259                                             const char *phandle_name,
 260                                             int index);
 261 extern int of_parse_phandle_with_args(struct device_node *np,
 262         const char *list_name, const char *cells_name, int index,
 263         struct of_phandle_args *out_args);
 264
 265 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
 266 extern int of_alias_get_id(struct device_node *np, const char *stem);
 267
 268 extern int of_machine_is_compatible(const char *compat);
 269
 270 extern int prom_add_property(struct device_node* np, struct property* prop);
 271 extern int prom_remove_property(struct device_node *np, struct property *prop);
 272 extern int prom_update_property(struct device_node *np,
 273                                 struct property *newprop);
 274
 275 #if defined(CONFIG_OF_DYNAMIC)
 276 /* For updating the device tree at runtime */
 277 extern void of_attach_node(struct device_node *);
 278 extern void of_detach_node(struct device_node *);
 279 #endif
 280
 281 #define of_match_ptr(_ptr)      (_ptr)
 282
 283 /*
 284  * struct property *prop;
 285  * const __be32 *p;
 286  * u32 u;
 287  *
 288  * of_property_for_each_u32(np, "propname", prop, p, u)
 289  *         printk("U32 value: %x\n", u);
 290  */
 291 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
 292                                u32 *pu);
 293 #define of_property_for_each_u32(np, propname, prop, p, u)      \
 294         for (prop = of_find_property(np, propname, NULL),       \
 295                 p = of_prop_next_u32(prop, NULL, &u);           \
 296                 p;                                              \
 297                 p = of_prop_next_u32(prop, p, &u))
 298
 299 /*
 300  * struct property *prop;
 301  * const char *s;
 302  *
 303  * of_property_for_each_string(np, "propname", prop, s)
 304  *         printk("String value: %s\n", s);
 305  */
 306 const char *of_prop_next_string(struct property *prop, const char *cur);
 307 #define of_property_for_each_string(np, propname, prop, s)      \
 308         for (prop = of_find_property(np, propname, NULL),       \
 309                 s = of_prop_next_string(prop, NULL);            \
 310                 s;                                              \
 311                 s = of_prop_next_string(prop, s))
 312
 313 #else /* CONFIG_OF */
 314
 315 static inline const char* of_node_full_name(struct device_node *np)
 316 {
 317         return "<no-node>";
 318 }
 319
 320 static inline struct device_node *of_find_node_by_name(struct device_node *from,
 321         const char *name)
 322 {
 323         return NULL;
 324 }
 325
 326 static inline bool of_have_populated_dt(void)
 327 {
 328         return false;
 329 }
 330
 331 #define for_each_child_of_node(parent, child) \
 332         while (0)
 333
 334 static inline int of_get_child_count(const struct device_node *np)
 335 {
 336         return 0;
 337 }
 338
 339 static inline int of_device_is_compatible(const struct device_node *device,
 340                                           const char *name)
 341 {
 342         return 0;
 343 }
 344
 345 static inline struct property *of_find_property(const struct device_node *np,
 346                                                 const char *name,
 347                                                 int *lenp)
 348 {
 349         return NULL;
 350 }
 351
 352 static inline struct device_node *of_find_compatible_node(
 353                                                 struct device_node *from,
 354                                                 const char *type,
 355                                                 const char *compat)
 356 {
 357         return NULL;
 358 }
 359
 360 static inline int of_property_read_u32_array(const struct device_node *np,
 361                                              const char *propname,
 362                                              u32 *out_values, size_t sz)
 363 {
 364         return -ENOSYS;
 365 }
 366
 367 static inline int of_property_read_string(struct device_node *np,
 368                                           const char *propname,
 369                                           const char **out_string)
 370 {
 371         return -ENOSYS;
 372 }
 373
 374 static inline int of_property_read_string_index(struct device_node *np,
 375                                                 const char *propname, int index,
 376                                                 const char **out_string)
 377 {
 378         return -ENOSYS;
 379 }
 380
 381 static inline int of_property_count_strings(struct device_node *np,
 382                                             const char *propname)
 383 {
 384         return -ENOSYS;
 385 }
 386
 387 static inline const void *of_get_property(const struct device_node *node,
 388                                 const char *name,
 389                                 int *lenp)
 390 {
 391         return NULL;
 392 }
 393
 394 static inline int of_property_read_u64(const struct device_node *np,
 395                                        const char *propname, u64 *out_value)
 396 {
 397         return -ENOSYS;
 398 }
 399
 400 static inline int of_property_match_string(struct device_node *np,
 401                                            const char *propname,
 402                                            const char *string)
 403 {
 404         return -ENOSYS;
 405 }
 406
 407 static inline struct device_node *of_parse_phandle(struct device_node *np,
 408                                                    const char *phandle_name,
 409                                                    int index)
 410 {
 411         return NULL;
 412 }
 413
 414 static inline int of_parse_phandle_with_args(struct device_node *np,
 415                                              const char *list_name,
 416                                              const char *cells_name,
 417                                              int index,
 418                                              struct of_phandle_args *out_args)
 419 {
 420         return -ENOSYS;
 421 }
 422
 423 static inline int of_alias_get_id(struct device_node *np, const char *stem)
 424 {
 425         return -ENOSYS;
 426 }
 427
 428 static inline int of_machine_is_compatible(const char *compat)
 429 {
 430         return 0;
 431 }
 432
 433 #define of_match_ptr(_ptr)      NULL
 434 #define of_match_node(_matches, _node)  NULL
 435 #define of_property_for_each_u32(np, propname, prop, p, u) \
 436         while (0)
 437 #define of_property_for_each_string(np, propname, prop, s) \
 438         while (0)
 439 #endif /* CONFIG_OF */
 440
 441 #ifndef of_node_to_nid
 442 static inline int of_node_to_nid(struct device_node *np)
 443 {
 444         return numa_node_id();
 445 }
 446
 447 #define of_node_to_nid of_node_to_nid
 448 #endif
 449
 450 /**
 451  * of_property_read_bool - Findfrom a property
 452  * @np:         device node from which the property value is to be read.
 453  * @propname:   name of the property to be searched.
 454  *
 455  * Search for a property in a device node.
 456  * Returns true if the property exist false otherwise.
 457  */
 458 static inline bool of_property_read_bool(const struct device_node *np,
 459                                          const char *propname)
 460 {
 461         struct property *prop = of_find_property(np, propname, NULL);
 462
 463         return prop ? true : false;
 464 }
 465
 466 static inline int of_property_read_u32(const struct device_node *np,
 467                                        const char *propname,
 468                                        u32 *out_value)
 469 {
 470         return of_property_read_u32_array(np, propname, out_value, 1);
 471 }
 472
 473 #endif /* _LINUX_OF_H */