of_fdt.h (3478B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Definitions for working with the Flattened Device Tree data format 4 * 5 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp 6 * benh@kernel.crashing.org 7 */ 8 9#ifndef _LINUX_OF_FDT_H 10#define _LINUX_OF_FDT_H 11 12#include <linux/types.h> 13#include <linux/init.h> 14#include <linux/errno.h> 15 16/* Definitions used by the flattened device tree */ 17#define OF_DT_HEADER 0xd00dfeed /* marker */ 18 19#ifndef __ASSEMBLY__ 20 21#if defined(CONFIG_OF_FLATTREE) 22 23struct device_node; 24 25/* For scanning an arbitrary device-tree at any time */ 26extern void *of_fdt_unflatten_tree(const unsigned long *blob, 27 struct device_node *dad, 28 struct device_node **mynodes); 29 30/* TBD: Temporary export of fdt globals - remove when code fully merged */ 31extern int __initdata dt_root_addr_cells; 32extern int __initdata dt_root_size_cells; 33extern void *initial_boot_params; 34 35extern char __dtb_start[]; 36extern char __dtb_end[]; 37 38/* Other Prototypes */ 39extern u64 of_flat_dt_translate_address(unsigned long node); 40extern void of_fdt_limit_memory(int limit); 41#endif /* CONFIG_OF_FLATTREE */ 42 43#ifdef CONFIG_OF_EARLY_FLATTREE 44/* For scanning the flat device-tree at boot time */ 45extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, 46 int depth, void *data), 47 void *data); 48extern int of_scan_flat_dt_subnodes(unsigned long node, 49 int (*it)(unsigned long node, 50 const char *uname, 51 void *data), 52 void *data); 53extern int of_get_flat_dt_subnode_by_name(unsigned long node, 54 const char *uname); 55extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, 56 int *size); 57extern int of_flat_dt_is_compatible(unsigned long node, const char *name); 58extern unsigned long of_get_flat_dt_root(void); 59extern uint32_t of_get_flat_dt_phandle(unsigned long node); 60 61extern int early_init_dt_scan_chosen(char *cmdline); 62extern int early_init_dt_scan_memory(void); 63extern void early_init_dt_check_for_usable_mem_range(void); 64extern int early_init_dt_scan_chosen_stdout(void); 65extern void early_init_fdt_scan_reserved_mem(void); 66extern void early_init_fdt_reserve_self(void); 67extern void early_init_dt_add_memory_arch(u64 base, u64 size); 68extern u64 dt_mem_next_cell(int s, const __be32 **cellp); 69 70/* Early flat tree scan hooks */ 71extern int early_init_dt_scan_root(void); 72 73extern bool early_init_dt_scan(void *params); 74extern bool early_init_dt_verify(void *params); 75extern void early_init_dt_scan_nodes(void); 76 77extern const char *of_flat_dt_get_machine_name(void); 78extern const void *of_flat_dt_match_machine(const void *default_match, 79 const void * (*get_next_compat)(const char * const**)); 80 81/* Other Prototypes */ 82extern void unflatten_device_tree(void); 83extern void unflatten_and_copy_device_tree(void); 84extern void early_init_devtree(void *); 85extern void early_get_first_memblock_info(void *, phys_addr_t *); 86#else /* CONFIG_OF_EARLY_FLATTREE */ 87static inline void early_init_dt_check_for_usable_mem_range(void) {} 88static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; } 89static inline void early_init_fdt_scan_reserved_mem(void) {} 90static inline void early_init_fdt_reserve_self(void) {} 91static inline const char *of_flat_dt_get_machine_name(void) { return NULL; } 92static inline void unflatten_device_tree(void) {} 93static inline void unflatten_and_copy_device_tree(void) {} 94#endif /* CONFIG_OF_EARLY_FLATTREE */ 95 96#endif /* __ASSEMBLY__ */ 97#endif /* _LINUX_OF_FDT_H */