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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 | #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 | |
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 { |
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 */ |
52 | /* version 2 fields below */ |
53 | __be32 boot_cpuid_phys; /* Physical CPU id we're booting on */ |
54 | /* version 3 fields below */ |
55 | __be32 dt_strings_size; /* size of the DT strings block */ |
56 | /* version 17 fields below */ |
57 | __be32 dt_struct_size; /* size of the DT structure block */ |
58 | }; |
59 | |
60 | #if defined(CONFIG_OF_FLATTREE) |
61 | |
62 | struct device_node; |
63 | |
64 | /* For scanning an arbitrary device-tree at any time */ |
65 | extern char *of_fdt_get_string(struct boot_param_header *blob, u32 offset); |
66 | extern void *of_fdt_get_property(struct boot_param_header *blob, |
67 | unsigned long node, |
68 | const char *name, |
69 | unsigned long *size); |
70 | extern int of_fdt_is_compatible(struct boot_param_header *blob, |
71 | unsigned long node, |
72 | const char *compat); |
73 | extern int of_fdt_match(struct boot_param_header *blob, unsigned long node, |
74 | const char *const *compat); |
75 | extern void of_fdt_unflatten_tree(unsigned long *blob, |
76 | struct device_node **mynodes); |
77 | |
78 | /* TBD: Temporary export of fdt globals - remove when code fully merged */ |
79 | extern int __initdata dt_root_addr_cells; |
80 | extern int __initdata dt_root_size_cells; |
81 | extern struct boot_param_header *initial_boot_params; |
82 | |
83 | /* For scanning the flat device-tree at boot time */ |
84 | extern char *find_flat_dt_string(u32 offset); |
85 | extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, |
86 | int depth, void *data), |
87 | void *data); |
88 | extern void *of_get_flat_dt_prop(unsigned long node, const char *name, |
89 | unsigned long *size); |
90 | extern int of_flat_dt_is_compatible(unsigned long node, const char *name); |
91 | extern int of_flat_dt_match(unsigned long node, const char *const *matches); |
92 | extern unsigned long of_get_flat_dt_root(void); |
93 | |
94 | extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, |
95 | int depth, void *data); |
96 | extern void early_init_dt_check_for_initrd(unsigned long node); |
97 | extern int early_init_dt_scan_memory(unsigned long node, const char *uname, |
98 | int depth, void *data); |
99 | extern void early_init_dt_add_memory_arch(u64 base, u64 size); |
100 | extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align); |
101 | extern u64 dt_mem_next_cell(int s, __be32 **cellp); |
102 | |
103 | /* |
104 | * If BLK_DEV_INITRD, the fdt early init code will call this function, |
105 | * to be provided by the arch code. start and end are specified as |
106 | * physical addresses. |
107 | */ |
108 | #ifdef CONFIG_BLK_DEV_INITRD |
109 | extern void early_init_dt_setup_initrd_arch(unsigned long start, |
110 | unsigned long end); |
111 | #endif |
112 | |
113 | /* Early flat tree scan hooks */ |
114 | extern int early_init_dt_scan_root(unsigned long node, const char *uname, |
115 | int depth, void *data); |
116 | |
117 | /* Other Prototypes */ |
118 | extern void unflatten_device_tree(void); |
119 | extern void early_init_devtree(void *); |
120 | #else /* CONFIG_OF_FLATTREE */ |
121 | static inline void unflatten_device_tree(void) {} |
122 | #endif /* CONFIG_OF_FLATTREE */ |
123 | |
124 | #endif /* __ASSEMBLY__ */ |
125 | #endif /* _LINUX_OF_FDT_H */ |
126 |
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