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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Definitions for working with the Flattened Device Tree data format4 *5 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp6 * benh@kernel.crashing.org7 */8 9#ifndef _LINUX_OF_FDT_H10#define _LINUX_OF_FDT_H11 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_FLATTREE44/* 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 */98