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 */
of_node_get(struct device_node * node)80 static inline struct device_node *of_node_get(struct device_node *node)
81 {
82 return node;
83 }
of_node_put(struct device_node * node)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
of_have_populated_dt(void)95 static inline bool of_have_populated_dt(void)
96 {
97 return allnodes != NULL;
98 }
99
of_node_is_root(const struct device_node * node)100 static inline bool of_node_is_root(const struct device_node *node)
101 {
102 return node && (node->parent == NULL);
103 }
104
of_node_check_flag(struct device_node * n,unsigned long flag)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
of_node_set_flag(struct device_node * n,unsigned long flag)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) */
of_read_number(const __be32 * cell,int size)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 */
of_read_ulong(const __be32 * cell,int size)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
of_node_to_nid(struct device_node * np)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
of_have_populated_dt(void)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
of_device_is_compatible(const struct device_node * device,const char * name)272 static inline int of_device_is_compatible(const struct device_node *device,
273 const char *name)
274 {
275 return 0;
276 }
277
of_find_property(const struct device_node * np,const char * name,int * lenp)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
of_find_compatible_node(struct device_node * from,const char * type,const char * compat)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
of_property_read_u32_array(const struct device_node * np,const char * propname,u32 * out_values,size_t sz)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
of_property_read_string(struct device_node * np,const char * propname,const char ** out_string)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
of_property_read_string_index(struct device_node * np,const char * propname,int index,const char ** out_string)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
of_property_count_strings(struct device_node * np,const char * propname)314 static inline int of_property_count_strings(struct device_node *np,
315 const char *propname)
316 {
317 return -ENOSYS;
318 }
319
of_get_property(const struct device_node * node,const char * name,int * lenp)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
of_property_read_u64(const struct device_node * np,const char * propname,u64 * out_value)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
of_parse_phandle(struct device_node * np,const char * phandle_name,int index)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
of_alias_get_id(struct device_node * np,const char * stem)340 static inline int of_alias_get_id(struct device_node *np, const char *stem)
341 {
342 return -ENOSYS;
343 }
344
of_machine_is_compatible(const char * compat)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 */
of_property_read_bool(const struct device_node * np,const char * propname)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
of_property_read_u32(const struct device_node * np,const char * propname,u32 * out_value)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 */
378