| | 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 | #include <linux/errno.h> |
| | 18 | |
| | 19 | /* Definitions used by the flattened device tree */ |
| | 20 | #define OF_DT_HEADER 0xd00dfeed /* marker */ |
| | 21 | |
| | 22 | #ifndef __ASSEMBLY__ |
| | 23 | |
| | 24 | #if defined(CONFIG_OF_FLATTREE) |
| | 25 | |
| | 26 | struct device_node; |
| | 27 | |
| | 28 | /* For scanning an arbitrary device-tree at any time */ |
| | 29 | extern char *of_fdt_get_string(const void *blob, u32 offset); |
| | 30 | extern void *of_fdt_get_property(const void *blob, |
| | 31 | unsigned long node, |
| | 32 | const char *name, |
| | 33 | int *size); |
| | 34 | extern bool of_fdt_is_big_endian(const void *blob, |
| | 35 | unsigned long node); |
| | 36 | extern int of_fdt_match(const void *blob, unsigned long node, |
| | 37 | const char *const *compat); |
| | 38 | extern void *of_fdt_unflatten_tree(const unsigned long *blob, |
| | 39 | struct device_node *dad, |
| | 40 | struct device_node **mynodes); |
| | 41 | |
| | 42 | /* TBD: Temporary export of fdt globals - remove when code fully merged */ |
| | 43 | extern int __initdata dt_root_addr_cells; |
| | 44 | extern int __initdata dt_root_size_cells; |
| | 45 | extern void *initial_boot_params; |
| | 46 | |
| | 47 | extern char __dtb_start[]; |
| | 48 | extern char __dtb_end[]; |
| | 49 | |
| | 50 | /* For scanning the flat device-tree at boot time */ |
| | 51 | extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, |
| | 52 | int depth, void *data), |
| | 53 | void *data); |
| | 54 | extern int of_scan_flat_dt_subnodes(unsigned long node, |
| | 55 | int (*it)(unsigned long node, |
| | 56 | const char *uname, |
| | 57 | void *data), |
| | 58 | void *data); |
| | 59 | extern int of_get_flat_dt_subnode_by_name(unsigned long node, |
| | 60 | const char *uname); |
| | 61 | extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, |
| | 62 | int *size); |
| | 63 | extern int of_flat_dt_is_compatible(unsigned long node, const char *name); |
| | 64 | extern int of_flat_dt_match(unsigned long node, const char *const *matches); |
| | 65 | extern unsigned long of_get_flat_dt_root(void); |
| | 66 | extern int of_get_flat_dt_size(void); |
| | 67 | extern uint32_t of_get_flat_dt_phandle(unsigned long node); |
| | 68 | |
| | 69 | extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, |
| | 70 | int depth, void *data); |
| | 71 | extern int early_init_dt_scan_memory(unsigned long node, const char *uname, |
| | 72 | int depth, void *data); |
| | 73 | extern int early_init_dt_scan_chosen_stdout(void); |
| | 74 | extern void early_init_fdt_scan_reserved_mem(void); |
| | 75 | extern void early_init_fdt_reserve_self(void); |
| | 76 | extern void early_init_dt_add_memory_arch(u64 base, u64 size); |
| | 77 | extern int early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size); |
| | 78 | extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size, |
| | 79 | bool no_map); |
| | 80 | extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align); |
| | 81 | extern u64 dt_mem_next_cell(int s, const __be32 **cellp); |
| | 82 | |
| | 83 | /* Early flat tree scan hooks */ |
| | 84 | extern int early_init_dt_scan_root(unsigned long node, const char *uname, |
| | 85 | int depth, void *data); |
| | 86 | |
| | 87 | extern bool early_init_dt_scan(void *params); |
| | 88 | extern bool early_init_dt_verify(void *params); |
| | 89 | extern void early_init_dt_scan_nodes(void); |
| | 90 | |
| | 91 | extern const char *of_flat_dt_get_machine_name(void); |
| | 92 | extern const void *of_flat_dt_match_machine(const void *default_match, |
| | 93 | const void * (*get_next_compat)(const char * const**)); |
| | 94 | |
| | 95 | /* Other Prototypes */ |
| | 96 | extern void unflatten_device_tree(void); |
| | 97 | extern void unflatten_and_copy_device_tree(void); |
| | 98 | extern void early_init_devtree(void *); |
| | 99 | extern void early_get_first_memblock_info(void *, phys_addr_t *); |
| | 100 | extern u64 of_flat_dt_translate_address(unsigned long node); |
| | 101 | extern void of_fdt_limit_memory(int limit); |
| | 102 | #else /* CONFIG_OF_FLATTREE */ |
| | 103 | static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; } |
| | 104 | static inline void early_init_fdt_scan_reserved_mem(void) {} |
| | 105 | static inline void early_init_fdt_reserve_self(void) {} |
| | 106 | static inline const char *of_flat_dt_get_machine_name(void) { return NULL; } |
| | 107 | static inline void unflatten_device_tree(void) {} |
| | 108 | static inline void unflatten_and_copy_device_tree(void) {} |
| | 109 | #endif /* CONFIG_OF_FLATTREE */ |
| | 110 | |
| | 111 | #endif /* __ASSEMBLY__ */ |
| | 112 | #endif /* _LINUX_OF_FDT_H */ |
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