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/kref.h>
  21 #include <linux/mod_devicetable.h>
  22 #include <linux/spinlock.h>
  23
  24 #include <asm/byteorder.h>
  25
  26 typedef u32 phandle;
  27 typedef u32 ihandle;
  28
  29 struct property {
  30         char    *name;
  31         int     length;
  32         void    *value;
  33         struct property *next;
  34         unsigned long _flags;
  35         unsigned int unique_id;
  36 };
  37
  38 #if defined(CONFIG_SPARC)
  39 struct of_irq_controller;
  40 #endif
  41
  42 struct device_node {
  43         const char *name;
  44         const char *type;
  45         phandle phandle;
  46         char    *full_name;
  47
  48         struct  property *properties;
  49         struct  property *deadprops;    /* removed properties */
  50         struct  device_node *parent;
  51         struct  device_node *child;
  52         struct  device_node *sibling;
  53         struct  device_node *next;      /* next device of same type */
  54         struct  device_node *allnext;   /* next in list of all nodes */
  55         struct  proc_dir_entry *pde;    /* this node's proc directory */
  56         struct  kref kref;
  57         unsigned long _flags;
  58         void    *data;
  59 #if defined(CONFIG_SPARC)
  60         char    *path_component_name;
  61         unsigned int unique_id;
  62         struct of_irq_controller *irq_trans;
  63 #endif
  64 };
  65
  66 #ifdef CONFIG_OF
  67
  68 /* Pointer for first entry in chain of all nodes. */
  69 extern struct device_node *allnodes;
  70 extern struct device_node *of_chosen;
  71 extern rwlock_t devtree_lock;
  72
  73 static inline bool of_have_populated_dt(void)
  74 {
  75         return allnodes != NULL;
  76 }
  77
  78 static inline bool of_node_is_root(const struct device_node *node)
  79 {
  80         return node && (node->parent == NULL);
  81 }
  82
  83 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
  84 {
  85         return test_bit(flag, &n->_flags);
  86 }
  87
  88 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
  89 {
  90         set_bit(flag, &n->_flags);
  91 }
  92
  93 extern struct device_node *of_find_all_nodes(struct device_node *prev);
  94
  95 #if defined(CONFIG_SPARC)
  96 /* Dummy ref counting routines - to be implemented later */
  97 static inline struct device_node *of_node_get(struct device_node *node)
  98 {
  99         return node;
 100 }
 101 static inline void of_node_put(struct device_node *node)
 102 {
 103 }
 104
 105 #else
 106 extern struct device_node *of_node_get(struct device_node *node);
 107 extern void of_node_put(struct device_node *node);
 108 #endif
 109
 110 /*
 111  * OF address retrieval & translation
 112  */
 113
 114 /* Helper to read a big number; size is in cells (not bytes) */
 115 static inline u64 of_read_number(const __be32 *cell, int size)
 116 {
 117         u64 r = 0;
 118         while (size--)
 119                 r = (r << 32) | be32_to_cpu(*(cell++));
 120         return r;
 121 }
 122
 123 /* Like of_read_number, but we want an unsigned long result */
 124 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 125 {
 126         /* toss away upper bits if unsigned long is smaller than u64 */
 127         return of_read_number(cell, size);
 128 }
 129
 130 #include <asm/prom.h>
 131
 132 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 133 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 134 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 135 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 136 #endif
 137
 138 /* Default string compare functions, Allow arch asm/prom.h to override */
 139 #if !defined(of_compat_cmp)
 140 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 141 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 142 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 143 #endif
 144
 145 /* flag descriptions */
 146 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 147 #define OF_DETACHED     2 /* node has been detached from the device tree */
 148
 149 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 150 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 151
 152 #define OF_BAD_ADDR     ((u64)-1)
 153
 154 #ifndef of_node_to_nid
 155 static inline int of_node_to_nid(struct device_node *np) { return -1; }
 156 #define of_node_to_nid of_node_to_nid
 157 #endif
 158
 159 extern struct device_node *of_find_node_by_name(struct device_node *from,
 160         const char *name);
 161 #define for_each_node_by_name(dn, name) \
 162         for (dn = of_find_node_by_name(NULL, name); dn; \
 163              dn = of_find_node_by_name(dn, name))
 164 extern struct device_node *of_find_node_by_type(struct device_node *from,
 165         const char *type);
 166 #define for_each_node_by_type(dn, type) \
 167         for (dn = of_find_node_by_type(NULL, type); dn; \
 168              dn = of_find_node_by_type(dn, type))
 169 extern struct device_node *of_find_compatible_node(struct device_node *from,
 170         const char *type, const char *compat);
 171 #define for_each_compatible_node(dn, type, compatible) \
 172         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 173              dn = of_find_compatible_node(dn, type, compatible))
 174 extern struct device_node *of_find_matching_node(struct device_node *from,
 175         const struct of_device_id *matches);
 176 #define for_each_matching_node(dn, matches) \
 177         for (dn = of_find_matching_node(NULL, matches); dn; \
 178              dn = of_find_matching_node(dn, matches))
 179 extern struct device_node *of_find_node_by_path(const char *path);
 180 extern struct device_node *of_find_node_by_phandle(phandle handle);
 181 extern struct device_node *of_get_parent(const struct device_node *node);
 182 extern struct device_node *of_get_next_parent(struct device_node *node);
 183 extern struct device_node *of_get_next_child(const struct device_node *node,
 184                                              struct device_node *prev);
 185 #define for_each_child_of_node(parent, child) \
 186         for (child = of_get_next_child(parent, NULL); child != NULL; \
 187              child = of_get_next_child(parent, child))
 188
 189 extern struct device_node *of_find_node_with_property(
 190         struct device_node *from, const char *prop_name);
 191 #define for_each_node_with_property(dn, prop_name) \
 192         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 193              dn = of_find_node_with_property(dn, prop_name))
 194
 195 extern struct property *of_find_property(const struct device_node *np,
 196                                          const char *name,
 197                                          int *lenp);
 198 extern int of_property_read_u32_array(const struct device_node *np,
 199                                       const char *propname,
 200                                       u32 *out_values,
 201                                       size_t sz);
 202
 203 extern int of_property_read_string(struct device_node *np,
 204                                    const char *propname,
 205                                    const char **out_string);
 206 extern int of_device_is_compatible(const struct device_node *device,
 207                                    const char *);
 208 extern int of_device_is_available(const struct device_node *device);
 209 extern const void *of_get_property(const struct device_node *node,
 210                                 const char *name,
 211                                 int *lenp);
 212 extern int of_n_addr_cells(struct device_node *np);
 213 extern int of_n_size_cells(struct device_node *np);
 214 extern const struct of_device_id *of_match_node(
 215         const struct of_device_id *matches, const struct device_node *node);
 216 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 217 extern struct device_node *of_parse_phandle(struct device_node *np,
 218                                             const char *phandle_name,
 219                                             int index);
 220 extern int of_parse_phandles_with_args(struct device_node *np,
 221         const char *list_name, const char *cells_name, int index,
 222         struct device_node **out_node, const void **out_args);
 223
 224 extern int of_machine_is_compatible(const char *compat);
 225
 226 extern int prom_add_property(struct device_node* np, struct property* prop);
 227 extern int prom_remove_property(struct device_node *np, struct property *prop);
 228 extern int prom_update_property(struct device_node *np,
 229                                 struct property *newprop,
 230                                 struct property *oldprop);
 231
 232 #if defined(CONFIG_OF_DYNAMIC)
 233 /* For updating the device tree at runtime */
 234 extern void of_attach_node(struct device_node *);
 235 extern void of_detach_node(struct device_node *);
 236 #endif
 237
 238 #else /* CONFIG_OF */
 239
 240 static inline bool of_have_populated_dt(void)
 241 {
 242         return false;
 243 }
 244
 245 static inline int of_property_read_u32_array(const struct device_node *np,
 246                                              const char *propname,
 247                                              u32 *out_values, size_t sz)
 248 {
 249         return -ENOSYS;
 250 }
 251
 252 static inline int of_property_read_string(struct device_node *np,
 253                                           const char *propname,
 254                                           const char **out_string)
 255 {
 256         return -ENOSYS;
 257 }
 258
 259 static inline const void *of_get_property(const struct device_node *node,
 260                                 const char *name,
 261                                 int *lenp)
 262 {
 263         return NULL;
 264 }
 265
 266 #endif /* CONFIG_OF */
 267
 268 static inline int of_property_read_u32(const struct device_node *np,
 269                                        const char *propname,
 270                                        u32 *out_value)
 271 {
 272         return of_property_read_u32_array(np, propname, out_value, 1);
 273 }
 274
 275 #endif /* _LINUX_OF_H */