Commit | Line | Data |
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d8678b58 GL |
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 | ||
8482f568 GL |
15 | #include <linux/types.h> |
16 | #include <linux/init.h> | |
17 | ||
d8678b58 GL |
18 | /* Definitions used by the flattened device tree */ |
19 | #define OF_DT_HEADER 0xd00dfeed /* marker */ | |
20 | #define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */ | |
21 | #define OF_DT_END_NODE 0x2 /* End node */ | |
22 | #define OF_DT_PROP 0x3 /* Property: name off, size, | |
23 | * content */ | |
24 | #define OF_DT_NOP 0x4 /* nop */ | |
25 | #define OF_DT_END 0x9 | |
26 | ||
27 | #define OF_DT_VERSION 0x10 | |
28 | ||
d45d94f6 GL |
29 | #ifndef __ASSEMBLY__ |
30 | /* | |
31 | * This is what gets passed to the kernel by prom_init or kexec | |
32 | * | |
33 | * The dt struct contains the device tree structure, full pathes and | |
34 | * property contents. The dt strings contain a separate block with just | |
35 | * the strings for the property names, and is fully page aligned and | |
36 | * self contained in a page, so that it can be kept around by the kernel, | |
37 | * each property name appears only once in this page (cheap compression) | |
38 | * | |
39 | * the mem_rsvmap contains a map of reserved ranges of physical memory, | |
40 | * passing it here instead of in the device-tree itself greatly simplifies | |
41 | * the job of everybody. It's just a list of u64 pairs (base/size) that | |
42 | * ends when size is 0 | |
43 | */ | |
44 | struct boot_param_header { | |
087f79c4 JK |
45 | __be32 magic; /* magic word OF_DT_HEADER */ |
46 | __be32 totalsize; /* total size of DT block */ | |
47 | __be32 off_dt_struct; /* offset to structure */ | |
48 | __be32 off_dt_strings; /* offset to strings */ | |
49 | __be32 off_mem_rsvmap; /* offset to memory reserve map */ | |
50 | __be32 version; /* format version */ | |
51 | __be32 last_comp_version; /* last compatible version */ | |
d45d94f6 | 52 | /* version 2 fields below */ |
087f79c4 | 53 | __be32 boot_cpuid_phys; /* Physical CPU id we're booting on */ |
d45d94f6 | 54 | /* version 3 fields below */ |
087f79c4 | 55 | __be32 dt_strings_size; /* size of the DT strings block */ |
d45d94f6 | 56 | /* version 17 fields below */ |
087f79c4 | 57 | __be32 dt_struct_size; /* size of the DT structure block */ |
d45d94f6 GL |
58 | }; |
59 | ||
e169cfbe | 60 | /* TBD: Temporary export of fdt globals - remove when code fully merged */ |
f00abd94 GL |
61 | extern int __initdata dt_root_addr_cells; |
62 | extern int __initdata dt_root_size_cells; | |
e169cfbe GL |
63 | extern struct boot_param_header *initial_boot_params; |
64 | ||
8482f568 | 65 | /* For scanning the flat device-tree at boot time */ |
e169cfbe | 66 | extern char *find_flat_dt_string(u32 offset); |
31a6a87d GL |
67 | extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, |
68 | int depth, void *data), | |
69 | void *data); | |
70 | extern void *of_get_flat_dt_prop(unsigned long node, const char *name, | |
71 | unsigned long *size); | |
72 | extern int of_flat_dt_is_compatible(unsigned long node, const char *name); | |
73 | extern unsigned long of_get_flat_dt_root(void); | |
86e03221 GL |
74 | extern void early_init_dt_scan_chosen_arch(unsigned long node); |
75 | extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, | |
76 | int depth, void *data); | |
f7b3a835 | 77 | extern void early_init_dt_check_for_initrd(unsigned long node); |
51975db0 GL |
78 | extern int early_init_dt_scan_memory(unsigned long node, const char *uname, |
79 | int depth, void *data); | |
80 | extern void early_init_dt_add_memory_arch(u64 base, u64 size); | |
4ef7b373 | 81 | extern u64 early_init_dt_alloc_memory_arch(u64 size, u64 align); |
2e89e685 | 82 | extern u64 dt_mem_next_cell(int s, __be32 **cellp); |
8482f568 | 83 | |
1406bc2f JK |
84 | /* |
85 | * If BLK_DEV_INITRD, the fdt early init code will call this function, | |
86 | * to be provided by the arch code. start and end are specified as | |
87 | * physical addresses. | |
88 | */ | |
89 | #ifdef CONFIG_BLK_DEV_INITRD | |
90 | extern void early_init_dt_setup_initrd_arch(unsigned long start, | |
91 | unsigned long end); | |
92 | #endif | |
93 | ||
f00abd94 GL |
94 | /* Early flat tree scan hooks */ |
95 | extern int early_init_dt_scan_root(unsigned long node, const char *uname, | |
96 | int depth, void *data); | |
97 | ||
82b2928c | 98 | /* Other Prototypes */ |
82b2928c GL |
99 | extern void unflatten_device_tree(void); |
100 | extern void early_init_devtree(void *); | |
82b2928c | 101 | |
d45d94f6 | 102 | #endif /* __ASSEMBLY__ */ |
d8678b58 | 103 | #endif /* _LINUX_OF_FDT_H */ |