| 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 **mynodes); |
| 42 | |
| 43 | /* TBD: Temporary export of fdt globals - remove when code fully merged */ |
| 44 | extern int __initdata dt_root_addr_cells; |
| 45 | extern int __initdata dt_root_size_cells; |
| 46 | extern void *initial_boot_params; |
| 47 | |
| 48 | extern char __dtb_start[]; |
| 49 | extern char __dtb_end[]; |
| 50 | |
| 51 | /* For scanning the flat device-tree at boot time */ |
| 52 | extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, |
| 53 | int depth, void *data), |
| 54 | void *data); |
| 55 | extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, |
| 56 | int *size); |
| 57 | extern int of_flat_dt_is_compatible(unsigned long node, const char *name); |
| 58 | extern int of_flat_dt_match(unsigned long node, const char *const *matches); |
| 59 | extern unsigned long of_get_flat_dt_root(void); |
| 60 | extern int of_get_flat_dt_size(void); |
| 61 | |
| 62 | extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, |
| 63 | int depth, void *data); |
| 64 | extern int early_init_dt_scan_memory(unsigned long node, const char *uname, |
| 65 | int depth, void *data); |
| 66 | extern void early_init_fdt_scan_reserved_mem(void); |
| 67 | extern void early_init_fdt_reserve_self(void); |
| 68 | extern void early_init_dt_add_memory_arch(u64 base, u64 size); |
| 69 | extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size, |
| 70 | bool no_map); |
| 71 | extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align); |
| 72 | extern u64 dt_mem_next_cell(int s, const __be32 **cellp); |
| 73 | |
| 74 | /* Early flat tree scan hooks */ |
| 75 | extern int early_init_dt_scan_root(unsigned long node, const char *uname, |
| 76 | int depth, void *data); |
| 77 | |
| 78 | extern bool early_init_dt_scan(void *params); |
| 79 | extern bool early_init_dt_verify(void *params); |
| 80 | extern void early_init_dt_scan_nodes(void); |
| 81 | |
| 82 | extern const char *of_flat_dt_get_machine_name(void); |
| 83 | extern const void *of_flat_dt_match_machine(const void *default_match, |
| 84 | const void * (*get_next_compat)(const char * const**)); |
| 85 | |
| 86 | /* Other Prototypes */ |
| 87 | extern void unflatten_device_tree(void); |
| 88 | extern void unflatten_and_copy_device_tree(void); |
| 89 | extern void early_init_devtree(void *); |
| 90 | extern void early_get_first_memblock_info(void *, phys_addr_t *); |
| 91 | extern u64 of_flat_dt_translate_address(unsigned long node); |
| 92 | extern void of_fdt_limit_memory(int limit); |
| 93 | #else /* CONFIG_OF_FLATTREE */ |
| 94 | static inline void early_init_fdt_scan_reserved_mem(void) {} |
| 95 | static inline void early_init_fdt_reserve_self(void) {} |
| 96 | static inline const char *of_flat_dt_get_machine_name(void) { return NULL; } |
| 97 | static inline void unflatten_device_tree(void) {} |
| 98 | static inline void unflatten_and_copy_device_tree(void) {} |
| 99 | #endif /* CONFIG_OF_FLATTREE */ |
| 100 | |
| 101 | #endif /* __ASSEMBLY__ */ |
| 102 | #endif /* _LINUX_OF_FDT_H */ |