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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 | ||
18 | /* Definitions used by the flattened device tree */ | |
19 | #define OF_DT_HEADER 0xd00dfeed /* marker */ | |
20 | ||
21 | #ifndef __ASSEMBLY__ | |
22 | ||
23 | #if defined(CONFIG_OF_FLATTREE) | |
24 | ||
25 | struct device_node; | |
26 | ||
27 | /* For scanning an arbitrary device-tree at any time */ | |
28 | extern char *of_fdt_get_string(const void *blob, u32 offset); | |
29 | extern void *of_fdt_get_property(const void *blob, | |
30 | unsigned long node, | |
31 | const char *name, | |
32 | int *size); | |
33 | extern int of_fdt_is_compatible(const void *blob, | |
34 | unsigned long node, | |
35 | const char *compat); | |
36 | extern bool of_fdt_is_big_endian(const void *blob, | |
37 | unsigned long node); | |
38 | extern int of_fdt_match(const void *blob, unsigned long node, | |
39 | const char *const *compat); | |
40 | extern void *of_fdt_unflatten_tree(const unsigned long *blob, | |
41 | struct device_node *dad, | |
42 | struct device_node **mynodes); | |
43 | ||
44 | /* TBD: Temporary export of fdt globals - remove when code fully merged */ | |
45 | extern int __initdata dt_root_addr_cells; | |
46 | extern int __initdata dt_root_size_cells; | |
47 | extern void *initial_boot_params; | |
48 | ||
49 | extern char __dtb_start[]; | |
50 | extern char __dtb_end[]; | |
51 | ||
52 | /* For scanning the flat device-tree at boot time */ | |
53 | extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, | |
54 | int depth, void *data), | |
55 | void *data); | |
56 | extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, | |
57 | int *size); | |
58 | extern int of_flat_dt_is_compatible(unsigned long node, const char *name); | |
59 | extern int of_flat_dt_match(unsigned long node, const char *const *matches); | |
60 | extern unsigned long of_get_flat_dt_root(void); | |
61 | extern int of_get_flat_dt_size(void); | |
62 | ||
63 | extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, | |
64 | int depth, void *data); | |
65 | extern int early_init_dt_scan_memory(unsigned long node, const char *uname, | |
66 | int depth, void *data); | |
67 | extern void early_init_fdt_scan_reserved_mem(void); | |
68 | extern void early_init_fdt_reserve_self(void); | |
69 | extern void early_init_dt_add_memory_arch(u64 base, u64 size); | |
70 | extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size, | |
71 | bool no_map); | |
72 | extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align); | |
73 | extern u64 dt_mem_next_cell(int s, const __be32 **cellp); | |
74 | ||
75 | /* Early flat tree scan hooks */ | |
76 | extern int early_init_dt_scan_root(unsigned long node, const char *uname, | |
77 | int depth, void *data); | |
78 | ||
79 | extern bool early_init_dt_scan(void *params); | |
80 | extern bool early_init_dt_verify(void *params); | |
81 | extern void early_init_dt_scan_nodes(void); | |
82 | ||
83 | extern const char *of_flat_dt_get_machine_name(void); | |
84 | extern const void *of_flat_dt_match_machine(const void *default_match, | |
85 | const void * (*get_next_compat)(const char * const**)); | |
86 | ||
87 | /* Other Prototypes */ | |
88 | extern void unflatten_device_tree(void); | |
89 | extern void unflatten_and_copy_device_tree(void); | |
90 | extern void early_init_devtree(void *); | |
91 | extern void early_get_first_memblock_info(void *, phys_addr_t *); | |
92 | extern u64 of_flat_dt_translate_address(unsigned long node); | |
93 | extern void of_fdt_limit_memory(int limit); | |
94 | #else /* CONFIG_OF_FLATTREE */ | |
95 | static inline void early_init_fdt_scan_reserved_mem(void) {} | |
96 | static inline void early_init_fdt_reserve_self(void) {} | |
97 | static inline const char *of_flat_dt_get_machine_name(void) { return NULL; } | |
98 | static inline void unflatten_device_tree(void) {} | |
99 | static inline void unflatten_and_copy_device_tree(void) {} | |
100 | #endif /* CONFIG_OF_FLATTREE */ | |
101 | ||
102 | #endif /* __ASSEMBLY__ */ | |
103 | #endif /* _LINUX_OF_FDT_H */ |