4 * Definitions for talking to the Open Firmware PROM on
5 * Power Macintosh and other computers.
7 * Copyright (C) 1996-2005 Paul Mackerras.
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.
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.
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 #include <linux/topology.h>
25 #include <linux/notifier.h>
27 #include <asm/byteorder.h>
28 #include <asm/errno.h>
37 struct property *next;
39 unsigned int unique_id;
42 #if defined(CONFIG_SPARC)
43 struct of_irq_controller;
50 const char *full_name;
52 struct property *properties;
53 struct property *deadprops; /* removed properties */
54 struct device_node *parent;
55 struct device_node *child;
56 struct device_node *sibling;
57 struct device_node *next; /* next device of same type */
58 struct device_node *allnext; /* next in list of all nodes */
59 struct proc_dir_entry *pde; /* this node's proc directory */
63 #if defined(CONFIG_SPARC)
64 const char *path_component_name;
65 unsigned int unique_id;
66 struct of_irq_controller *irq_trans;
70 #define MAX_PHANDLE_ARGS 8
71 struct of_phandle_args {
72 struct device_node *np;
74 uint32_t args[MAX_PHANDLE_ARGS];
77 #ifdef CONFIG_OF_DYNAMIC
78 extern struct device_node *of_node_get(struct device_node *node);
79 extern void of_node_put(struct device_node *node);
80 #else /* CONFIG_OF_DYNAMIC */
81 /* Dummy ref counting routines - to be implemented later */
82 static inline struct device_node *of_node_get(struct device_node *node)
86 static inline void of_node_put(struct device_node *node) { }
87 #endif /* !CONFIG_OF_DYNAMIC */
91 /* Pointer for first entry in chain of all nodes. */
92 extern struct device_node *of_allnodes;
93 extern struct device_node *of_chosen;
94 extern struct device_node *of_aliases;
95 extern raw_spinlock_t devtree_lock;
97 static inline bool of_have_populated_dt(void)
99 return of_allnodes != NULL;
102 static inline bool of_node_is_root(const struct device_node *node)
104 return node && (node->parent == NULL);
107 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
109 return test_bit(flag, &n->_flags);
112 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
114 set_bit(flag, &n->_flags);
117 extern struct device_node *of_find_all_nodes(struct device_node *prev);
120 * OF address retrieval & translation
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)
128 r = (r << 32) | be32_to_cpu(*(cell++));
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)
135 /* toss away upper bits if unsigned long is smaller than u64 */
136 return of_read_number(cell, size);
139 #if defined(CONFIG_SPARC)
140 #include <asm/prom.h>
143 /* Default #address and #size cells. Allow arch asm/prom.h to override */
144 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
145 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
146 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
149 /* Default string compare functions, Allow arch asm/prom.h to override */
150 #if !defined(of_compat_cmp)
151 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
152 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
153 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
156 /* flag descriptions */
157 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
158 #define OF_DETACHED 2 /* node has been detached from the device tree */
160 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
161 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
163 #define OF_BAD_ADDR ((u64)-1)
165 static inline const char *of_node_full_name(const struct device_node *np)
167 return np ? np->full_name : "<no-node>";
170 extern struct device_node *of_find_node_by_name(struct device_node *from,
172 #define for_each_node_by_name(dn, name) \
173 for (dn = of_find_node_by_name(NULL, name); dn; \
174 dn = of_find_node_by_name(dn, name))
175 extern struct device_node *of_find_node_by_type(struct device_node *from,
177 #define for_each_node_by_type(dn, type) \
178 for (dn = of_find_node_by_type(NULL, type); dn; \
179 dn = of_find_node_by_type(dn, type))
180 extern struct device_node *of_find_compatible_node(struct device_node *from,
181 const char *type, const char *compat);
182 #define for_each_compatible_node(dn, type, compatible) \
183 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
184 dn = of_find_compatible_node(dn, type, compatible))
185 extern struct device_node *of_find_matching_node_and_match(
186 struct device_node *from,
187 const struct of_device_id *matches,
188 const struct of_device_id **match);
189 static inline struct device_node *of_find_matching_node(
190 struct device_node *from,
191 const struct of_device_id *matches)
193 return of_find_matching_node_and_match(from, matches, NULL);
195 #define for_each_matching_node(dn, matches) \
196 for (dn = of_find_matching_node(NULL, matches); dn; \
197 dn = of_find_matching_node(dn, matches))
198 #define for_each_matching_node_and_match(dn, matches, match) \
199 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
200 dn; dn = of_find_matching_node_and_match(dn, matches, match))
201 extern struct device_node *of_find_node_by_path(const char *path);
202 extern struct device_node *of_find_node_by_phandle(phandle handle);
203 extern struct device_node *of_get_parent(const struct device_node *node);
204 extern struct device_node *of_get_next_parent(struct device_node *node);
205 extern struct device_node *of_get_next_child(const struct device_node *node,
206 struct device_node *prev);
207 extern struct device_node *of_get_next_available_child(
208 const struct device_node *node, struct device_node *prev);
210 extern struct device_node *of_get_child_by_name(const struct device_node *node,
212 #define for_each_child_of_node(parent, child) \
213 for (child = of_get_next_child(parent, NULL); child != NULL; \
214 child = of_get_next_child(parent, child))
216 #define for_each_available_child_of_node(parent, child) \
217 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
218 child = of_get_next_available_child(parent, child))
220 static inline int of_get_child_count(const struct device_node *np)
222 struct device_node *child;
225 for_each_child_of_node(np, child)
231 static inline int of_get_available_child_count(const struct device_node *np)
233 struct device_node *child;
236 for_each_available_child_of_node(np, child)
243 extern struct device_node *of_find_next_cache_node(const struct device_node *);
244 extern struct device_node *of_find_node_with_property(
245 struct device_node *from, const char *prop_name);
246 #define for_each_node_with_property(dn, prop_name) \
247 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
248 dn = of_find_node_with_property(dn, prop_name))
250 extern struct property *of_find_property(const struct device_node *np,
253 extern int of_property_read_u32_index(const struct device_node *np,
254 const char *propname,
255 u32 index, u32 *out_value);
256 extern int of_property_read_u8_array(const struct device_node *np,
257 const char *propname, u8 *out_values, size_t sz);
258 extern int of_property_read_u16_array(const struct device_node *np,
259 const char *propname, u16 *out_values, size_t sz);
260 extern int of_property_read_u32_array(const struct device_node *np,
261 const char *propname,
264 extern int of_property_read_u64(const struct device_node *np,
265 const char *propname, u64 *out_value);
267 extern int of_property_read_string(struct device_node *np,
268 const char *propname,
269 const char **out_string);
270 extern int of_property_read_string_index(struct device_node *np,
271 const char *propname,
272 int index, const char **output);
273 extern int of_property_match_string(struct device_node *np,
274 const char *propname,
276 extern int of_property_count_strings(struct device_node *np,
277 const char *propname);
278 extern int of_device_is_compatible(const struct device_node *device,
280 extern int of_device_is_available(const struct device_node *device);
281 extern const void *of_get_property(const struct device_node *node,
284 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
285 #define for_each_property_of_node(dn, pp) \
286 for (pp = dn->properties; pp != NULL; pp = pp->next)
288 extern int of_n_addr_cells(struct device_node *np);
289 extern int of_n_size_cells(struct device_node *np);
290 extern const struct of_device_id *of_match_node(
291 const struct of_device_id *matches, const struct device_node *node);
292 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
293 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
294 extern struct device_node *of_parse_phandle(const struct device_node *np,
295 const char *phandle_name,
297 extern int of_parse_phandle_with_args(const struct device_node *np,
298 const char *list_name, const char *cells_name, int index,
299 struct of_phandle_args *out_args);
300 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
301 const char *list_name, int cells_count, int index,
302 struct of_phandle_args *out_args);
303 extern int of_count_phandle_with_args(const struct device_node *np,
304 const char *list_name, const char *cells_name);
306 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
307 extern int of_alias_get_id(struct device_node *np, const char *stem);
309 extern int of_machine_is_compatible(const char *compat);
311 extern int of_add_property(struct device_node *np, struct property *prop);
312 extern int of_remove_property(struct device_node *np, struct property *prop);
313 extern int of_update_property(struct device_node *np, struct property *newprop);
315 /* For updating the device tree at runtime */
316 #define OF_RECONFIG_ATTACH_NODE 0x0001
317 #define OF_RECONFIG_DETACH_NODE 0x0002
318 #define OF_RECONFIG_ADD_PROPERTY 0x0003
319 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
320 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
322 struct of_prop_reconfig {
323 struct device_node *dn;
324 struct property *prop;
327 extern int of_reconfig_notifier_register(struct notifier_block *);
328 extern int of_reconfig_notifier_unregister(struct notifier_block *);
329 extern int of_reconfig_notify(unsigned long, void *);
331 extern int of_attach_node(struct device_node *);
332 extern int of_detach_node(struct device_node *);
334 #define of_match_ptr(_ptr) (_ptr)
337 * struct property *prop;
341 * of_property_for_each_u32(np, "propname", prop, p, u)
342 * printk("U32 value: %x\n", u);
344 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
347 * struct property *prop;
350 * of_property_for_each_string(np, "propname", prop, s)
351 * printk("String value: %s\n", s);
353 const char *of_prop_next_string(struct property *prop, const char *cur);
355 int of_device_is_stdout_path(struct device_node *dn);
357 #else /* CONFIG_OF */
359 static inline const char* of_node_full_name(struct device_node *np)
364 static inline struct device_node *of_find_node_by_name(struct device_node *from,
370 static inline struct device_node *of_get_parent(const struct device_node *node)
375 static inline bool of_have_populated_dt(void)
380 #define for_each_child_of_node(parent, child) \
383 #define for_each_available_child_of_node(parent, child) \
386 static inline struct device_node *of_get_child_by_name(
387 const struct device_node *node,
393 static inline int of_get_child_count(const struct device_node *np)
398 static inline int of_get_available_child_count(const struct device_node *np)
403 static inline int of_device_is_compatible(const struct device_node *device,
409 static inline int of_device_is_available(const struct device_node *device)
414 static inline struct property *of_find_property(const struct device_node *np,
421 static inline struct device_node *of_find_compatible_node(
422 struct device_node *from,
429 static inline int of_property_read_u32_index(const struct device_node *np,
430 const char *propname, u32 index, u32 *out_value)
435 static inline int of_property_read_u8_array(const struct device_node *np,
436 const char *propname, u8 *out_values, size_t sz)
441 static inline int of_property_read_u16_array(const struct device_node *np,
442 const char *propname, u16 *out_values, size_t sz)
447 static inline int of_property_read_u32_array(const struct device_node *np,
448 const char *propname,
449 u32 *out_values, size_t sz)
454 static inline int of_property_read_string(struct device_node *np,
455 const char *propname,
456 const char **out_string)
461 static inline int of_property_read_string_index(struct device_node *np,
462 const char *propname, int index,
463 const char **out_string)
468 static inline int of_property_count_strings(struct device_node *np,
469 const char *propname)
474 static inline const void *of_get_property(const struct device_node *node,
481 static inline struct device_node *of_get_cpu_node(int cpu,
482 unsigned int *thread)
487 static inline int of_property_read_u64(const struct device_node *np,
488 const char *propname, u64 *out_value)
493 static inline int of_property_match_string(struct device_node *np,
494 const char *propname,
500 static inline struct device_node *of_parse_phandle(const struct device_node *np,
501 const char *phandle_name,
507 static inline int of_parse_phandle_with_args(struct device_node *np,
508 const char *list_name,
509 const char *cells_name,
511 struct of_phandle_args *out_args)
516 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
517 const char *list_name, int cells_count, int index,
518 struct of_phandle_args *out_args)
523 static inline int of_count_phandle_with_args(struct device_node *np,
524 const char *list_name,
525 const char *cells_name)
530 static inline int of_alias_get_id(struct device_node *np, const char *stem)
535 static inline int of_machine_is_compatible(const char *compat)
540 static inline int of_device_is_stdout_path(struct device_node *dn)
545 static inline const __be32 *of_prop_next_u32(struct property *prop,
546 const __be32 *cur, u32 *pu)
551 static inline const char *of_prop_next_string(struct property *prop,
557 #define of_match_ptr(_ptr) NULL
558 #define of_match_node(_matches, _node) NULL
559 #endif /* CONFIG_OF */
561 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
562 extern int of_node_to_nid(struct device_node *np);
564 static inline int of_node_to_nid(struct device_node *device) { return 0; }
568 * of_property_read_bool - Findfrom a property
569 * @np: device node from which the property value is to be read.
570 * @propname: name of the property to be searched.
572 * Search for a property in a device node.
573 * Returns true if the property exist false otherwise.
575 static inline bool of_property_read_bool(const struct device_node *np,
576 const char *propname)
578 struct property *prop = of_find_property(np, propname, NULL);
580 return prop ? true : false;
583 static inline int of_property_read_u8(const struct device_node *np,
584 const char *propname,
587 return of_property_read_u8_array(np, propname, out_value, 1);
590 static inline int of_property_read_u16(const struct device_node *np,
591 const char *propname,
594 return of_property_read_u16_array(np, propname, out_value, 1);
597 static inline int of_property_read_u32(const struct device_node *np,
598 const char *propname,
601 return of_property_read_u32_array(np, propname, out_value, 1);
604 #define of_property_for_each_u32(np, propname, prop, p, u) \
605 for (prop = of_find_property(np, propname, NULL), \
606 p = of_prop_next_u32(prop, NULL, &u); \
608 p = of_prop_next_u32(prop, p, &u))
610 #define of_property_for_each_string(np, propname, prop, s) \
611 for (prop = of_find_property(np, propname, NULL), \
612 s = of_prop_next_string(prop, NULL); \
614 s = of_prop_next_string(prop, s))
616 #if defined(CONFIG_PROC_FS) && defined(CONFIG_PROC_DEVICETREE)
617 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
618 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
619 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
620 struct property *prop);
621 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
622 struct property *newprop,
623 struct property *oldprop);
626 #endif /* _LINUX_OF_H */