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 */ 113