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 bool of_node_is_root(const struct device_node *node)
  74 {
  75         return node && (node->parent == NULL);
  76 }
  77
  78 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
  79 {
  80         return test_bit(flag, &n->_flags);
  81 }
  82
  83 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
  84 {
  85         set_bit(flag, &n->_flags);
  86 }
  87
  88 extern struct device_node *of_find_all_nodes(struct device_node *prev);
  89
  90 #if defined(CONFIG_SPARC)
  91 /* Dummy ref counting routines - to be implemented later */
  92 static inline struct device_node *of_node_get(struct device_node *node)
  93 {
  94         return node;
  95 }
  96 static inline void of_node_put(struct device_node *node)
  97 {
  98 }
  99
 100 #else
 101 extern struct device_node *of_node_get(struct device_node *node);
 102 extern void of_node_put(struct device_node *node);
 103 #endif
 104
 105 /*
 106  * OF address retreival & translation
 107  */
 108
 109 /* Helper to read a big number; size is in cells (not bytes) */
 110 static inline u64 of_read_number(const __be32 *cell, int size)
 111 {
 112         u64 r = 0;
 113         while (size--)
 114                 r = (r << 32) | be32_to_cpu(*(cell++));
 115         return r;
 116 }
 117
 118 /* Like of_read_number, but we want an unsigned long result */
 119 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 120 {
 121         /* toss away upper bits if unsigned long is smaller than u64 */
 122         return of_read_number(cell, size);
 123 }
 124
 125 #include <asm/prom.h>
 126
 127 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 128 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 129 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 130 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 131 #endif
 132
 133 /* Default string compare functions, Allow arch asm/prom.h to override */
 134 #if !defined(of_compat_cmp)
 135 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 136 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 137 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 138 #endif
 139
 140 /* flag descriptions */
 141 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 142 #define OF_DETACHED     2 /* node has been detached from the device tree */
 143
 144 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 145 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 146
 147 #define OF_BAD_ADDR     ((u64)-1)
 148
 149 #ifndef of_node_to_nid
 150 static inline int of_node_to_nid(struct device_node *np) { return -1; }
 151 #define of_node_to_nid of_node_to_nid
 152 #endif
 153
 154 extern struct device_node *of_find_node_by_name(struct device_node *from,
 155         const char *name);
 156 #define for_each_node_by_name(dn, name) \
 157         for (dn = of_find_node_by_name(NULL, name); dn; \
 158              dn = of_find_node_by_name(dn, name))
 159 extern struct device_node *of_find_node_by_type(struct device_node *from,
 160         const char *type);
 161 #define for_each_node_by_type(dn, type) \
 162         for (dn = of_find_node_by_type(NULL, type); dn; \
 163              dn = of_find_node_by_type(dn, type))
 164 extern struct device_node *of_find_compatible_node(struct device_node *from,
 165         const char *type, const char *compat);
 166 #define for_each_compatible_node(dn, type, compatible) \
 167         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 168              dn = of_find_compatible_node(dn, type, compatible))
 169 extern struct device_node *of_find_matching_node(struct device_node *from,
 170         const struct of_device_id *matches);
 171 #define for_each_matching_node(dn, matches) \
 172         for (dn = of_find_matching_node(NULL, matches); dn; \
 173              dn = of_find_matching_node(dn, matches))
 174 extern struct device_node *of_find_node_by_path(const char *path);
 175 extern struct device_node *of_find_node_by_phandle(phandle handle);
 176 extern struct device_node *of_get_parent(const struct device_node *node);
 177 extern struct device_node *of_get_next_parent(struct device_node *node);
 178 extern struct device_node *of_get_next_child(const struct device_node *node,
 179                                              struct device_node *prev);
 180 #define for_each_child_of_node(parent, child) \
 181         for (child = of_get_next_child(parent, NULL); child != NULL; \
 182              child = of_get_next_child(parent, child))
 183
 184 extern struct device_node *of_find_node_with_property(
 185         struct device_node *from, const char *prop_name);
 186 #define for_each_node_with_property(dn, prop_name) \
 187         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 188              dn = of_find_node_with_property(dn, prop_name))
 189
 190 extern struct property *of_find_property(const struct device_node *np,
 191                                          const char *name,
 192                                          int *lenp);
 193 extern int of_device_is_compatible(const struct device_node *device,
 194                                    const char *);
 195 extern int of_device_is_available(const struct device_node *device);
 196 extern const void *of_get_property(const struct device_node *node,
 197                                 const char *name,
 198                                 int *lenp);
 199 extern int of_n_addr_cells(struct device_node *np);
 200 extern int of_n_size_cells(struct device_node *np);
 201 extern const struct of_device_id *of_match_node(
 202         const struct of_device_id *matches, const struct device_node *node);
 203 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 204 extern struct device_node *of_parse_phandle(struct device_node *np,
 205                                             const char *phandle_name,
 206                                             int index);
 207 extern int of_parse_phandles_with_args(struct device_node *np,
 208         const char *list_name, const char *cells_name, int index,
 209         struct device_node **out_node, const void **out_args);
 210
 211 extern int of_machine_is_compatible(const char *compat);
 212
 213 extern int prom_add_property(struct device_node* np, struct property* prop);
 214 extern int prom_remove_property(struct device_node *np, struct property *prop);
 215 extern int prom_update_property(struct device_node *np,
 216                                 struct property *newprop,
 217                                 struct property *oldprop);
 218
 219 #if defined(CONFIG_OF_DYNAMIC)
 220 /* For updating the device tree at runtime */
 221 extern void of_attach_node(struct device_node *);
 222 extern void of_detach_node(struct device_node *);
 223 #endif
 224
 225 #endif /* CONFIG_OF */
 226 #endif /* _LINUX_OF_H */