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 #include <asm/prom.h>
141 /* Default #address and #size cells. Allow arch asm/prom.h to override */
142 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
143 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
144 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
147 /* Default string compare functions, Allow arch asm/prom.h to override */
148 #if !defined(of_compat_cmp)
149 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
150 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
151 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
154 /* flag descriptions */
155 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
156 #define OF_DETACHED 2 /* node has been detached from the device tree */
158 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
159 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
161 #define OF_BAD_ADDR ((u64)-1)
163 static inline const char *of_node_full_name(const struct device_node *np)
165 return np ? np->full_name : "<no-node>";
168 extern struct device_node *of_find_node_by_name(struct device_node *from,
170 #define for_each_node_by_name(dn, name) \
171 for (dn = of_find_node_by_name(NULL, name); dn; \
172 dn = of_find_node_by_name(dn, name))
173 extern struct device_node *of_find_node_by_type(struct device_node *from,
175 #define for_each_node_by_type(dn, type) \
176 for (dn = of_find_node_by_type(NULL, type); dn; \
177 dn = of_find_node_by_type(dn, type))
178 extern struct device_node *of_find_compatible_node(struct device_node *from,
179 const char *type, const char *compat);
180 #define for_each_compatible_node(dn, type, compatible) \
181 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
182 dn = of_find_compatible_node(dn, type, compatible))
183 extern struct device_node *of_find_matching_node_and_match(
184 struct device_node *from,
185 const struct of_device_id *matches,
186 const struct of_device_id **match);
187 static inline struct device_node *of_find_matching_node(
188 struct device_node *from,
189 const struct of_device_id *matches)
191 return of_find_matching_node_and_match(from, matches, NULL);
193 #define for_each_matching_node(dn, matches) \
194 for (dn = of_find_matching_node(NULL, matches); dn; \
195 dn = of_find_matching_node(dn, matches))
196 #define for_each_matching_node_and_match(dn, matches, match) \
197 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
198 dn; dn = of_find_matching_node_and_match(dn, matches, match))
199 extern struct device_node *of_find_node_by_path(const char *path);
200 extern struct device_node *of_find_node_by_phandle(phandle handle);
201 extern struct device_node *of_get_parent(const struct device_node *node);
202 extern struct device_node *of_get_next_parent(struct device_node *node);
203 extern struct device_node *of_get_next_child(const struct device_node *node,
204 struct device_node *prev);
205 extern struct device_node *of_get_next_available_child(
206 const struct device_node *node, struct device_node *prev);
208 extern struct device_node *of_get_child_by_name(const struct device_node *node,
210 #define for_each_child_of_node(parent, child) \
211 for (child = of_get_next_child(parent, NULL); child != NULL; \
212 child = of_get_next_child(parent, child))
214 #define for_each_available_child_of_node(parent, child) \
215 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
216 child = of_get_next_available_child(parent, child))
218 static inline int of_get_child_count(const struct device_node *np)
220 struct device_node *child;
223 for_each_child_of_node(np, child)
229 extern struct device_node *of_find_node_with_property(
230 struct device_node *from, const char *prop_name);
231 #define for_each_node_with_property(dn, prop_name) \
232 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
233 dn = of_find_node_with_property(dn, prop_name))
235 extern struct property *of_find_property(const struct device_node *np,
238 extern int of_property_read_u32_index(const struct device_node *np,
239 const char *propname,
240 u32 index, u32 *out_value);
242 extern int of_property_read_u8_array_tp(const struct device_node *np,
243 const char *propname, u8 *out_values, size_t sz);
245 extern int of_property_read_u8_array(const struct device_node *np,
246 const char *propname, u8 *out_values, size_t sz);
247 extern int of_property_read_u16_array(const struct device_node *np,
248 const char *propname, u16 *out_values, size_t sz);
249 extern int of_property_read_u32_array(const struct device_node *np,
250 const char *propname,
253 extern int of_property_read_u64(const struct device_node *np,
254 const char *propname, u64 *out_value);
256 extern int of_property_read_string(struct device_node *np,
257 const char *propname,
258 const char **out_string);
259 extern int of_property_match_string(struct device_node *np,
260 const char *propname,
262 extern int of_property_read_string_helper(struct device_node *np,
263 const char *propname,
264 const char **out_strs, size_t sz, int index);
265 extern int of_device_is_compatible(const struct device_node *device,
267 extern int of_device_is_available(const struct device_node *device);
268 extern const void *of_get_property(const struct device_node *node,
271 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
272 #define for_each_property_of_node(dn, pp) \
273 for (pp = dn->properties; pp != NULL; pp = pp->next)
275 extern int of_n_addr_cells(struct device_node *np);
276 extern int of_n_size_cells(struct device_node *np);
277 extern const struct of_device_id *of_match_node(
278 const struct of_device_id *matches, const struct device_node *node);
279 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
280 extern struct device_node *of_parse_phandle(const struct device_node *np,
281 const char *phandle_name,
283 extern int of_parse_phandle_with_args(const struct device_node *np,
284 const char *list_name, const char *cells_name, int index,
285 struct of_phandle_args *out_args);
286 extern int of_count_phandle_with_args(const struct device_node *np,
287 const char *list_name, const char *cells_name);
289 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
290 extern int of_alias_get_id(struct device_node *np, const char *stem);
292 extern int of_machine_is_compatible(const char *compat);
294 extern int of_add_property(struct device_node *np, struct property *prop);
295 extern int of_remove_property(struct device_node *np, struct property *prop);
296 extern int of_update_property(struct device_node *np, struct property *newprop);
298 /* For updating the device tree at runtime */
299 #define OF_RECONFIG_ATTACH_NODE 0x0001
300 #define OF_RECONFIG_DETACH_NODE 0x0002
301 #define OF_RECONFIG_ADD_PROPERTY 0x0003
302 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
303 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
305 struct of_prop_reconfig {
306 struct device_node *dn;
307 struct property *prop;
310 extern int of_reconfig_notifier_register(struct notifier_block *);
311 extern int of_reconfig_notifier_unregister(struct notifier_block *);
312 extern int of_reconfig_notify(unsigned long, void *);
314 extern int of_attach_node(struct device_node *);
315 extern int of_detach_node(struct device_node *);
317 #define of_match_ptr(_ptr) (_ptr)
320 * struct property *prop;
324 * of_property_for_each_u32(np, "propname", prop, p, u)
325 * printk("U32 value: %x\n", u);
327 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
329 #define of_property_for_each_u32(np, propname, prop, p, u) \
330 for (prop = of_find_property(np, propname, NULL), \
331 p = of_prop_next_u32(prop, NULL, &u); \
333 p = of_prop_next_u32(prop, p, &u))
336 * struct property *prop;
339 * of_property_for_each_string(np, "propname", prop, s)
340 * printk("String value: %s\n", s);
342 const char *of_prop_next_string(struct property *prop, const char *cur);
343 #define of_property_for_each_string(np, propname, prop, s) \
344 for (prop = of_find_property(np, propname, NULL), \
345 s = of_prop_next_string(prop, NULL); \
347 s = of_prop_next_string(prop, s))
349 int of_device_is_stdout_path(struct device_node *dn);
351 #else /* CONFIG_OF */
353 static inline const char* of_node_full_name(struct device_node *np)
358 static inline struct device_node *of_find_node_by_name(struct device_node *from,
364 static inline struct device_node *of_get_parent(const struct device_node *node)
369 static inline bool of_have_populated_dt(void)
374 #define for_each_child_of_node(parent, child) \
377 static inline struct device_node *of_get_child_by_name(
378 const struct device_node *node,
384 static inline int of_get_child_count(const struct device_node *np)
389 static inline int of_device_is_compatible(const struct device_node *device,
395 static inline int of_device_is_available(const struct device_node *device)
400 static inline struct property *of_find_property(const struct device_node *np,
407 static inline struct device_node *of_find_compatible_node(
408 struct device_node *from,
416 static inline int of_property_read_u32_index(const struct device_node *np,
417 const char *propname, u32 index, u32 *out_value)
422 static inline int of_property_read_u8_array_tp(const struct device_node *np,
423 const char *propname, u8 *out_values, size_t sz)
430 static inline int of_property_read_u8_array(const struct device_node *np,
431 const char *propname, u8 *out_values, size_t sz)
436 static inline int of_property_read_u16_array(const struct device_node *np,
437 const char *propname, u16 *out_values, size_t sz)
442 static inline int of_property_read_u32_array(const struct device_node *np,
443 const char *propname,
444 u32 *out_values, size_t sz)
449 static inline int of_property_read_string(struct device_node *np,
450 const char *propname,
451 const char **out_string)
456 static inline int of_property_read_string_helper(struct device_node *np,
457 const char *propname,
458 const char **out_strs, size_t sz, int index)
463 static inline const void *of_get_property(const struct device_node *node,
470 static inline struct device_node *of_get_cpu_node(int cpu,
471 unsigned int *thread)
476 static inline int of_property_read_u64(const struct device_node *np,
477 const char *propname, u64 *out_value)
482 static inline int of_property_match_string(struct device_node *np,
483 const char *propname,
489 static inline struct device_node *of_parse_phandle(const struct device_node *np,
490 const char *phandle_name,
496 static inline int of_parse_phandle_with_args(struct device_node *np,
497 const char *list_name,
498 const char *cells_name,
500 struct of_phandle_args *out_args)
505 static inline int of_count_phandle_with_args(struct device_node *np,
506 const char *list_name,
507 const char *cells_name)
512 static inline int of_alias_get_id(struct device_node *np, const char *stem)
517 static inline int of_machine_is_compatible(const char *compat)
522 static inline int of_device_is_stdout_path(struct device_node *dn)
527 #define of_match_ptr(_ptr) NULL
528 #define of_match_node(_matches, _node) NULL
529 #define of_property_for_each_u32(np, propname, prop, p, u) \
531 #define of_property_for_each_string(np, propname, prop, s) \
533 #endif /* CONFIG_OF */
535 #ifndef of_node_to_nid
536 static inline int of_node_to_nid(struct device_node *np)
538 return numa_node_id();
541 #define of_node_to_nid of_node_to_nid
545 * of_property_read_string_array() - Read an array of strings from a multiple
547 * @np: device node from which the property value is to be read.
548 * @propname: name of the property to be searched.
549 * @out_strs: output array of string pointers.
550 * @sz: number of array elements to read.
552 * Search for a property in a device tree node and retrieve a list of
553 * terminated string values (pointer to data, not a copy) in that property.
555 * If @out_strs is NULL, the number of strings in the property is returned.
557 static inline int of_property_read_string_array(struct device_node *np,
558 const char *propname, const char **out_strs,
561 return of_property_read_string_helper(np, propname, out_strs, sz, 0);
565 * of_property_count_strings() - Find and return the number of strings from a
566 * multiple strings property.
567 * @np: device node from which the property value is to be read.
568 * @propname: name of the property to be searched.
570 * Search for a property in a device tree node and retrieve the number of null
571 * terminated string contain in it. Returns the number of strings on
572 * success, -EINVAL if the property does not exist, -ENODATA if property
573 * does not have a value, and -EILSEQ if the string is not null-terminated
574 * within the length of the property data.
576 static inline int of_property_count_strings(struct device_node *np,
577 const char *propname)
579 return of_property_read_string_helper(np, propname, NULL, 0, 0);
583 * of_property_read_string_index() - Find and read a string from a multiple
585 * @np: device node from which the property value is to be read.
586 * @propname: name of the property to be searched.
587 * @index: index of the string in the list of strings
588 * @out_string: pointer to null terminated return string, modified only if
591 * Search for a property in a device tree node and retrieve a null
592 * terminated string value (pointer to data, not a copy) in the list of strings
593 * contained in that property.
594 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
595 * property does not have a value, and -EILSEQ if the string is not
596 * null-terminated within the length of the property data.
598 * The out_string pointer is modified only if a valid string can be decoded.
600 static inline int of_property_read_string_index(struct device_node *np,
601 const char *propname,
602 int index, const char **output)
604 int rc = of_property_read_string_helper(np, propname, output, 1, index);
605 return rc < 0 ? rc : 0;
609 * of_property_read_bool - Findfrom a property
610 * @np: device node from which the property value is to be read.
611 * @propname: name of the property to be searched.
613 * Search for a property in a device node.
614 * Returns true if the property exist false otherwise.
616 static inline bool of_property_read_bool(const struct device_node *np,
617 const char *propname)
619 struct property *prop = of_find_property(np, propname, NULL);
621 return prop ? true : false;
624 static inline int of_property_read_u8(const struct device_node *np,
625 const char *propname,
628 return of_property_read_u8_array(np, propname, out_value, 1);
631 static inline int of_property_read_u16(const struct device_node *np,
632 const char *propname,
635 return of_property_read_u16_array(np, propname, out_value, 1);
638 static inline int of_property_read_u32(const struct device_node *np,
639 const char *propname,
642 return of_property_read_u32_array(np, propname, out_value, 1);
645 #if defined(CONFIG_PROC_FS) && defined(CONFIG_PROC_DEVICETREE)
646 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
647 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
648 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
649 struct property *prop);
650 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
651 struct property *newprop,
652 struct property *oldprop);
655 #endif /* _LINUX_OF_H */