Linux kernel mirror (for testing)
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linux
1/*
2 * Definitions for working with the Flattened Device Tree data format
3 *
4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
5 * benh@kernel.crashing.org
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 */
11
12#ifndef _LINUX_OF_FDT_H
13#define _LINUX_OF_FDT_H
14
15#include <linux/types.h>
16#include <linux/init.h>
17#include <linux/errno.h>
18
19/* Definitions used by the flattened device tree */
20#define OF_DT_HEADER 0xd00dfeed /* marker */
21
22#ifndef __ASSEMBLY__
23
24#if defined(CONFIG_OF_FLATTREE)
25
26struct device_node;
27
28/* For scanning an arbitrary device-tree at any time */
29extern char *of_fdt_get_string(const void *blob, u32 offset);
30extern void *of_fdt_get_property(const void *blob,
31 unsigned long node,
32 const char *name,
33 int *size);
34extern bool of_fdt_is_big_endian(const void *blob,
35 unsigned long node);
36extern int of_fdt_match(const void *blob, unsigned long node,
37 const char *const *compat);
38extern void *of_fdt_unflatten_tree(const unsigned long *blob,
39 struct device_node *dad,
40 struct device_node **mynodes);
41
42/* TBD: Temporary export of fdt globals - remove when code fully merged */
43extern int __initdata dt_root_addr_cells;
44extern int __initdata dt_root_size_cells;
45extern void *initial_boot_params;
46
47extern char __dtb_start[];
48extern char __dtb_end[];
49
50/* For scanning the flat device-tree at boot time */
51extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
52 int depth, void *data),
53 void *data);
54extern int of_scan_flat_dt_subnodes(unsigned long node,
55 int (*it)(unsigned long node,
56 const char *uname,
57 void *data),
58 void *data);
59extern int of_get_flat_dt_subnode_by_name(unsigned long node,
60 const char *uname);
61extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
62 int *size);
63extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
64extern int of_flat_dt_match(unsigned long node, const char *const *matches);
65extern unsigned long of_get_flat_dt_root(void);
66extern int of_get_flat_dt_size(void);
67extern uint32_t of_get_flat_dt_phandle(unsigned long node);
68
69extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
70 int depth, void *data);
71extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
72 int depth, void *data);
73extern int early_init_dt_scan_chosen_stdout(void);
74extern void early_init_fdt_scan_reserved_mem(void);
75extern void early_init_fdt_reserve_self(void);
76extern void early_init_dt_add_memory_arch(u64 base, u64 size);
77extern int early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size);
78extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
79 bool no_map);
80extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
81extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
82
83/* Early flat tree scan hooks */
84extern int early_init_dt_scan_root(unsigned long node, const char *uname,
85 int depth, void *data);
86
87extern bool early_init_dt_scan(void *params);
88extern bool early_init_dt_verify(void *params);
89extern void early_init_dt_scan_nodes(void);
90
91extern const char *of_flat_dt_get_machine_name(void);
92extern const void *of_flat_dt_match_machine(const void *default_match,
93 const void * (*get_next_compat)(const char * const**));
94
95/* Other Prototypes */
96extern void unflatten_device_tree(void);
97extern void unflatten_and_copy_device_tree(void);
98extern void early_init_devtree(void *);
99extern void early_get_first_memblock_info(void *, phys_addr_t *);
100extern u64 of_flat_dt_translate_address(unsigned long node);
101extern void of_fdt_limit_memory(int limit);
102#else /* CONFIG_OF_FLATTREE */
103static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
104static inline void early_init_fdt_scan_reserved_mem(void) {}
105static inline void early_init_fdt_reserve_self(void) {}
106static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
107static inline void unflatten_device_tree(void) {}
108static inline void unflatten_and_copy_device_tree(void) {}
109#endif /* CONFIG_OF_FLATTREE */
110
111#endif /* __ASSEMBLY__ */
112#endif /* _LINUX_OF_FDT_H */