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 #if defined(CONFIG_SPARC) || !defined(CONFIG_OF)
  76 /* Dummy ref counting routines - to be implemented later */
  77 static inline struct device_node *of_node_get(struct device_node *node)
  78 {
  79         return node;
  80 }
  81 static inline void of_node_put(struct device_node *node)
  82 {
  83 }
  84 #else
  85 extern struct device_node *of_node_get(struct device_node *node);
  86 extern void of_node_put(struct device_node *node);
  87 #endif
  88
  89 #ifdef CONFIG_OF
  90
  91 /* Pointer for first entry in chain of all nodes. */
  92 extern struct device_node *allnodes;
  93 extern struct device_node *of_chosen;
  94 extern struct device_node *of_aliases;
  95 extern rwlock_t devtree_lock;
  96
  97 static inline bool of_have_populated_dt(void)
  98 {
  99         return 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 #include <asm/prom.h>
 140
 141 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 142 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 143 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 144 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 145 #endif
 146
 147 /* Default string compare functions, Allow arch asm/prom.h to override */
 148 #if !defined(of_compat_cmp)
 149 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 150 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 151 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 152 #endif
 153
 154 /* flag descriptions */
 155 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 156 #define OF_DETACHED     2 /* node has been detached from the device tree */
 157
 158 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 159 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 160
 161 #define OF_BAD_ADDR     ((u64)-1)
 162
 163 #ifndef of_node_to_nid
 164 static inline int of_node_to_nid(struct device_node *np) { return -1; }
 165 #define of_node_to_nid of_node_to_nid
 166 #endif
 167
 168 extern struct device_node *of_find_node_by_name(struct device_node *from,
 169         const char *name);
 170 #define for_each_node_by_name(dn, name) \
 171         for (dn = of_find_node_by_name(NULL, name); dn; \
 172              dn = of_find_node_by_name(dn, name))
 173 extern struct device_node *of_find_node_by_type(struct device_node *from,
 174         const char *type);
 175 #define for_each_node_by_type(dn, type) \
 176         for (dn = of_find_node_by_type(NULL, type); dn; \
 177              dn = of_find_node_by_type(dn, type))
 178 extern struct device_node *of_find_compatible_node(struct device_node *from,
 179         const char *type, const char *compat);
 180 #define for_each_compatible_node(dn, type, compatible) \
 181         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 182              dn = of_find_compatible_node(dn, type, compatible))
 183 extern struct device_node *of_find_matching_node(struct device_node *from,
 184         const struct of_device_id *matches);
 185 #define for_each_matching_node(dn, matches) \
 186         for (dn = of_find_matching_node(NULL, matches); dn; \
 187              dn = of_find_matching_node(dn, matches))
 188 extern struct device_node *of_find_node_by_path(const char *path);
 189 extern struct device_node *of_find_node_by_phandle(phandle handle);
 190 extern struct device_node *of_get_parent(const struct device_node *node);
 191 extern struct device_node *of_get_next_parent(struct device_node *node);
 192 extern struct device_node *of_get_next_child(const struct device_node *node,
 193                                              struct device_node *prev);
 194 #define for_each_child_of_node(parent, child) \
 195         for (child = of_get_next_child(parent, NULL); child != NULL; \
 196              child = of_get_next_child(parent, child))
 197
 198 extern struct device_node *of_find_node_with_property(
 199         struct device_node *from, const char *prop_name);
 200 #define for_each_node_with_property(dn, prop_name) \
 201         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 202              dn = of_find_node_with_property(dn, prop_name))
 203
 204 extern struct property *of_find_property(const struct device_node *np,
 205                                          const char *name,
 206                                          int *lenp);
 207 extern int of_property_read_u32_array(const struct device_node *np,
 208                                       const char *propname,
 209                                       u32 *out_values,
 210                                       size_t sz);
 211 extern int of_property_read_u64(const struct device_node *np,
 212                                 const char *propname, u64 *out_value);
 213
 214 extern int of_property_read_string(struct device_node *np,
 215                                    const char *propname,
 216                                    const char **out_string);
 217 extern int of_property_read_string_index(struct device_node *np,
 218                                          const char *propname,
 219                                          int index, const char **output);
 220 extern int of_property_count_strings(struct device_node *np,
 221                                      const char *propname);
 222 extern int of_device_is_compatible(const struct device_node *device,
 223                                    const char *);
 224 extern int of_device_is_available(const struct device_node *device);
 225 extern const void *of_get_property(const struct device_node *node,
 226                                 const char *name,
 227                                 int *lenp);
 228 #define for_each_property_of_node(dn, pp) \
 229         for (pp = dn->properties; pp != NULL; pp = pp->next)
 230
 231 extern int of_n_addr_cells(struct device_node *np);
 232 extern int of_n_size_cells(struct device_node *np);
 233 extern const struct of_device_id *of_match_node(
 234         const struct of_device_id *matches, const struct device_node *node);
 235 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 236 extern struct device_node *of_parse_phandle(struct device_node *np,
 237                                             const char *phandle_name,
 238                                             int index);
 239 extern int of_parse_phandle_with_args(struct device_node *np,
 240         const char *list_name, const char *cells_name, int index,
 241         struct of_phandle_args *out_args);
 242
 243 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
 244 extern int of_alias_get_id(struct device_node *np, const char *stem);
 245
 246 extern int of_machine_is_compatible(const char *compat);
 247
 248 extern int prom_add_property(struct device_node* np, struct property* prop);
 249 extern int prom_remove_property(struct device_node *np, struct property *prop);
 250 extern int prom_update_property(struct device_node *np,
 251                                 struct property *newprop,
 252                                 struct property *oldprop);
 253
 254 #if defined(CONFIG_OF_DYNAMIC)
 255 /* For updating the device tree at runtime */
 256 extern void of_attach_node(struct device_node *);
 257 extern void of_detach_node(struct device_node *);
 258 #endif
 259
 260 #define of_match_ptr(_ptr)      (_ptr)
 261 #else /* CONFIG_OF */
 262
 263 static inline bool of_have_populated_dt(void)
 264 {
 265         return false;
 266 }
 267
 268 #define for_each_child_of_node(parent, child) \
 269         while (0)
 270
 271 static inline int of_device_is_compatible(const struct device_node *device,
 272                                           const char *name)
 273 {
 274         return 0;
 275 }
 276
 277 static inline struct property *of_find_property(const struct device_node *np,
 278                                                 const char *name,
 279                                                 int *lenp)
 280 {
 281         return NULL;
 282 }
 283
 284 static inline int of_property_read_u32_array(const struct device_node *np,
 285                                              const char *propname,
 286                                              u32 *out_values, size_t sz)
 287 {
 288         return -ENOSYS;
 289 }
 290
 291 static inline int of_property_read_string(struct device_node *np,
 292                                           const char *propname,
 293                                           const char **out_string)
 294 {
 295         return -ENOSYS;
 296 }
 297
 298 static inline int of_property_read_string_index(struct device_node *np,
 299                                                 const char *propname, int index,
 300                                                 const char **out_string)
 301 {
 302         return -ENOSYS;
 303 }
 304
 305 static inline int of_property_count_strings(struct device_node *np,
 306                                             const char *propname)
 307 {
 308         return -ENOSYS;
 309 }
 310
 311 static inline const void *of_get_property(const struct device_node *node,
 312                                 const char *name,
 313                                 int *lenp)
 314 {
 315         return NULL;
 316 }
 317
 318 static inline int of_property_read_u64(const struct device_node *np,
 319                                        const char *propname, u64 *out_value)
 320 {
 321         return -ENOSYS;
 322 }
 323
 324 static inline struct device_node *of_parse_phandle(struct device_node *np,
 325                                                    const char *phandle_name,
 326                                                    int index)
 327 {
 328         return NULL;
 329 }
 330
 331 static inline int of_alias_get_id(struct device_node *np, const char *stem)
 332 {
 333         return -ENOSYS;
 334 }
 335
 336 static inline int of_machine_is_compatible(const char *compat)
 337 {
 338         return 0;
 339 }
 340
 341 #define of_match_ptr(_ptr)      NULL
 342 #define of_match_node(_matches, _node)  NULL
 343 #endif /* CONFIG_OF */
 344
 345 static inline int of_property_read_u32(const struct device_node *np,
 346                                        const char *propname,
 347                                        u32 *out_value)
 348 {
 349         return of_property_read_u32_array(np, propname, out_value, 1);
 350 }
 351
 352 #endif /* _LINUX_OF_H */