Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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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
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
25struct device_node;
26
27/* For scanning an arbitrary device-tree at any time */
28extern char *of_fdt_get_string(const void *blob, u32 offset);
29extern void *of_fdt_get_property(const void *blob,
30 unsigned long node,
31 const char *name,
32 int *size);
33extern int of_fdt_is_compatible(const void *blob,
34 unsigned long node,
35 const char *compat);
36extern bool of_fdt_is_big_endian(const void *blob,
37 unsigned long node);
38extern int of_fdt_match(const void *blob, unsigned long node,
39 const char *const *compat);
40extern 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 */
45extern int __initdata dt_root_addr_cells;
46extern int __initdata dt_root_size_cells;
47extern void *initial_boot_params;
48
49extern char __dtb_start[];
50extern char __dtb_end[];
51
52/* For scanning the flat device-tree at boot time */
53extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
54 int depth, void *data),
55 void *data);
56extern int of_get_flat_dt_subnode_by_name(unsigned long node,
57 const char *uname);
58extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
59 int *size);
60extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
61extern int of_flat_dt_match(unsigned long node, const char *const *matches);
62extern unsigned long of_get_flat_dt_root(void);
63extern int of_get_flat_dt_size(void);
64
65extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
66 int depth, void *data);
67extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
68 int depth, void *data);
69extern void early_init_fdt_scan_reserved_mem(void);
70extern void early_init_fdt_reserve_self(void);
71extern void early_init_dt_add_memory_arch(u64 base, u64 size);
72extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
73 bool no_map);
74extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
75extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
76
77/* Early flat tree scan hooks */
78extern int early_init_dt_scan_root(unsigned long node, const char *uname,
79 int depth, void *data);
80
81extern bool early_init_dt_scan(void *params);
82extern bool early_init_dt_verify(void *params);
83extern void early_init_dt_scan_nodes(void);
84
85extern const char *of_flat_dt_get_machine_name(void);
86extern const void *of_flat_dt_match_machine(const void *default_match,
87 const void * (*get_next_compat)(const char * const**));
88
89/* Other Prototypes */
90extern void unflatten_device_tree(void);
91extern void unflatten_and_copy_device_tree(void);
92extern void early_init_devtree(void *);
93extern void early_get_first_memblock_info(void *, phys_addr_t *);
94extern u64 of_flat_dt_translate_address(unsigned long node);
95extern void of_fdt_limit_memory(int limit);
96#else /* CONFIG_OF_FLATTREE */
97static inline void early_init_fdt_scan_reserved_mem(void) {}
98static inline void early_init_fdt_reserve_self(void) {}
99static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
100static inline void unflatten_device_tree(void) {}
101static inline void unflatten_and_copy_device_tree(void) {}
102#endif /* CONFIG_OF_FLATTREE */
103
104#endif /* __ASSEMBLY__ */
105#endif /* _LINUX_OF_FDT_H */