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 #ifdef CONFIG_OF
  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 /* 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 int of_node_check_flag(struct device_node *n, unsigned long flag)
  74 {
  75         return test_bit(flag, &n->_flags);
  76 }
  77
  78 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
  79 {
  80         set_bit(flag, &n->_flags);
  81 }
  82
  83 extern struct device_node *of_find_all_nodes(struct device_node *prev);
  84
  85 #if defined(CONFIG_SPARC)
  86 /* Dummy ref counting routines - to be implemented later */
  87 static inline struct device_node *of_node_get(struct device_node *node)
  88 {
  89         return node;
  90 }
  91 static inline void of_node_put(struct device_node *node)
  92 {
  93 }
  94
  95 #else
  96 extern struct device_node *of_node_get(struct device_node *node);
  97 extern void of_node_put(struct device_node *node);
  98 #endif
  99
 100 /*
 101  * OF address retreival & translation
 102  */
 103
 104 /* Helper to read a big number; size is in cells (not bytes) */
 105 static inline u64 of_read_number(const __be32 *cell, int size)
 106 {
 107         u64 r = 0;
 108         while (size--)
 109                 r = (r << 32) | be32_to_cpu(*(cell++));
 110         return r;
 111 }
 112
 113 /* Like of_read_number, but we want an unsigned long result */
 114 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 115 {
 116         /* toss away upper bits if unsigned long is smaller than u64 */
 117         return of_read_number(cell, size);
 118 }
 119
 120 #include <asm/prom.h>
 121
 122 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 123 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 124 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 125 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 126 #endif
 127
 128 /* Default string compare functions, Allow arch asm/prom.h to override */
 129 #if !defined(of_compat_cmp)
 130 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 131 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 132 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 133 #endif
 134
 135 /* flag descriptions */
 136 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 137 #define OF_DETACHED     2 /* node has been detached from the device tree */
 138
 139 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 140 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 141
 142 #define OF_BAD_ADDR     ((u64)-1)
 143
 144 extern struct device_node *of_find_node_by_name(struct device_node *from,
 145         const char *name);
 146 #define for_each_node_by_name(dn, name) \
 147         for (dn = of_find_node_by_name(NULL, name); dn; \
 148              dn = of_find_node_by_name(dn, name))
 149 extern struct device_node *of_find_node_by_type(struct device_node *from,
 150         const char *type);
 151 #define for_each_node_by_type(dn, type) \
 152         for (dn = of_find_node_by_type(NULL, type); dn; \
 153              dn = of_find_node_by_type(dn, type))
 154 extern struct device_node *of_find_compatible_node(struct device_node *from,
 155         const char *type, const char *compat);
 156 #define for_each_compatible_node(dn, type, compatible) \
 157         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 158              dn = of_find_compatible_node(dn, type, compatible))
 159 extern struct device_node *of_find_matching_node(struct device_node *from,
 160         const struct of_device_id *matches);
 161 #define for_each_matching_node(dn, matches) \
 162         for (dn = of_find_matching_node(NULL, matches); dn; \
 163              dn = of_find_matching_node(dn, matches))
 164 extern struct device_node *of_find_node_by_path(const char *path);
 165 extern struct device_node *of_find_node_by_phandle(phandle handle);
 166 extern struct device_node *of_get_parent(const struct device_node *node);
 167 extern struct device_node *of_get_next_parent(struct device_node *node);
 168 extern struct device_node *of_get_next_child(const struct device_node *node,
 169                                              struct device_node *prev);
 170 #define for_each_child_of_node(parent, child) \
 171         for (child = of_get_next_child(parent, NULL); child != NULL; \
 172              child = of_get_next_child(parent, child))
 173
 174 extern struct device_node *of_find_node_with_property(
 175         struct device_node *from, const char *prop_name);
 176 #define for_each_node_with_property(dn, prop_name) \
 177         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 178              dn = of_find_node_with_property(dn, prop_name))
 179
 180 extern struct property *of_find_property(const struct device_node *np,
 181                                          const char *name,
 182                                          int *lenp);
 183 extern int of_device_is_compatible(const struct device_node *device,
 184                                    const char *);
 185 extern int of_device_is_available(const struct device_node *device);
 186 extern const void *of_get_property(const struct device_node *node,
 187                                 const char *name,
 188                                 int *lenp);
 189 extern int of_n_addr_cells(struct device_node *np);
 190 extern int of_n_size_cells(struct device_node *np);
 191 extern const struct of_device_id *of_match_node(
 192         const struct of_device_id *matches, const struct device_node *node);
 193 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 194 extern struct device_node *of_parse_phandle(struct device_node *np,
 195                                             const char *phandle_name,
 196                                             int index);
 197 extern int of_parse_phandles_with_args(struct device_node *np,
 198         const char *list_name, const char *cells_name, int index,
 199         struct device_node **out_node, const void **out_args);
 200
 201 extern int of_machine_is_compatible(const char *compat);
 202
 203 extern int prom_add_property(struct device_node* np, struct property* prop);
 204 extern int prom_remove_property(struct device_node *np, struct property *prop);
 205 extern int prom_update_property(struct device_node *np,
 206                                 struct property *newprop,
 207                                 struct property *oldprop);
 208
 209 #if defined(CONFIG_OF_DYNAMIC)
 210 /* For updating the device tree at runtime */
 211 extern void of_attach_node(struct device_node *);
 212 extern void of_detach_node(struct device_node *);
 213 #endif
 214
 215 #endif /* CONFIG_OF */
 216 #endif /* _LINUX_OF_H */