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