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 int of_fdt_match(const void *blob, unsigned long node, 37 const char *const *compat); 38 extern void of_fdt_unflatten_tree(unsigned long *blob, 39 struct device_node **mynodes); 40 41 /* TBD: Temporary export of fdt globals - remove when code fully merged */ 42 extern int __initdata dt_root_addr_cells; 43 extern int __initdata dt_root_size_cells; 44 extern void *initial_boot_params; 45 46 extern char __dtb_start[]; 47 extern char __dtb_end[]; 48 49 /* For scanning the flat device-tree at boot time */ 50 extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, 51 int depth, void *data), 52 void *data); 53 extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, 54 int *size); 55 extern int of_flat_dt_is_compatible(unsigned long node, const char *name); 56 extern int of_flat_dt_match(unsigned long node, const char *const *matches); 57 extern unsigned long of_get_flat_dt_root(void); 58 extern int of_get_flat_dt_size(void); 59 60 extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, 61 int depth, void *data); 62 extern int early_init_dt_scan_memory(unsigned long node, const char *uname, 63 int depth, void *data); 64 extern void early_init_fdt_scan_reserved_mem(void); 65 extern void early_init_dt_add_memory_arch(u64 base, u64 size); 66 extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size, 67 bool no_map); 68 extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align); 69 extern u64 dt_mem_next_cell(int s, const __be32 **cellp); 70 71 /* Early flat tree scan hooks */ 72 extern int early_init_dt_scan_root(unsigned long node, const char *uname, 73 int depth, void *data); 74 75 extern bool early_init_dt_scan(void *params); 76 extern bool early_init_dt_verify(void *params); 77 extern void early_init_dt_scan_nodes(void); 78 79 extern const char *of_flat_dt_get_machine_name(void); 80 extern const void *of_flat_dt_match_machine(const void *default_match, 81 const void * (*get_next_compat)(const char * const**)); 82 83 /* Other Prototypes */ 84 extern void unflatten_device_tree(void); 85 extern void unflatten_and_copy_device_tree(void); 86 extern void early_init_devtree(void *); 87 extern void early_get_first_memblock_info(void *, phys_addr_t *); 88 extern u64 fdt_translate_address(const void *blob, int node_offset); 89 extern void of_fdt_limit_memory(int limit); 90 #else /* CONFIG_OF_FLATTREE */ 91 static inline void early_init_fdt_scan_reserved_mem(void) {} 92 static inline const char *of_flat_dt_get_machine_name(void) { return NULL; } 93 static inline void unflatten_device_tree(void) {} 94 static inline void unflatten_and_copy_device_tree(void) {} 95 #endif /* CONFIG_OF_FLATTREE */ 96 97 #endif /* __ASSEMBLY__ */ 98 #endif /* _LINUX_OF_FDT_H */ 99