/* SPDX-License-Identifier: GPL-2.0 */ /* * Definitions for working with the Flattened Device Tree data format * * Copyright 2009 Benjamin Herrenschmidt, IBM Corp * benh@kernel.crashing.org #ifndef _LINUX_OF_FDT_H#define _LINUX_OF_FDT_H#include <linux/types.h>#include <linux/init.h>#include <linux/errno.h>/* Definitions used by the flattened device tree */ #define OF_DT_HEADER 0xd00dfeed /* marker */ #ifndef __ASSEMBLY__#if defined (CONFIG_OF_FLATTREE)struct device_node;/* For scanning an arbitrary device-tree at any time */ extern void *of_fdt_unflatten_tree(const unsigned long *blob,struct device_node *dad,struct device_node **mynodes);/* TBD: Temporary export of fdt globals - remove when code fully merged */ extern int __initdata dt_root_addr_cells;extern int __initdata dt_root_size_cells;extern void *initial_boot_params;extern phys_addr_t initial_boot_params_pa;extern char __dtb_start[];extern char __dtb_end[];/* Other Prototypes */ extern u64 of_flat_dt_translate_address(unsigned long node);extern void of_fdt_limit_memory(int limit);#endif /* CONFIG_OF_FLATTREE */ #ifdef CONFIG_OF_EARLY_FLATTREE/* For scanning the flat device-tree at boot time */ extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,int depth, void *data),void *data);extern int of_scan_flat_dt_subnodes(unsigned long node,int (*it)(unsigned long node,const char *uname,void *data),void *data);extern int of_get_flat_dt_subnode_by_name(unsigned long node,const char *uname);extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,int *size);extern int of_flat_dt_is_compatible(unsigned long node, const char *name);extern unsigned long of_get_flat_dt_root(void );extern uint32_t of_get_flat_dt_phandle(unsigned long node);extern int early_init_dt_scan_chosen(char *cmdline);extern int early_init_dt_scan_memory(void );extern void early_init_dt_check_for_usable_mem_range(void );extern int early_init_dt_scan_chosen_stdout(void );extern void early_init_fdt_scan_reserved_mem(void );extern void early_init_fdt_reserve_self(void );extern void early_init_dt_add_memory_arch(u64 base, u64 size);extern u64 dt_mem_next_cell(int s, const __be32 **cellp);/* Early flat tree scan hooks */ extern int early_init_dt_scan_root(void );extern bool early_init_dt_scan(void *dt_virt, phys_addr_t dt_phys);extern bool early_init_dt_verify(void *dt_virt, phys_addr_t dt_phys);extern void early_init_dt_scan_nodes(void );extern const char *of_flat_dt_get_machine_name(void );extern const void *of_flat_dt_match_machine(const void *default_match,const void * (*get_next_compat)(const char * const **));/* Other Prototypes */ extern void unflatten_device_tree(void );extern void unflatten_and_copy_device_tree(void );extern void early_init_devtree(void *);extern void early_get_first_memblock_info(void *, phys_addr_t *);#else /* CONFIG_OF_EARLY_FLATTREE */ static inline void early_init_dt_check_for_usable_mem_range(void ) {}static inline int early_init_dt_scan_chosen_stdout(void ) { return -ENODEV; }static inline void early_init_fdt_scan_reserved_mem(void ) {}static inline void early_init_fdt_reserve_self(void ) {}static inline const char *of_flat_dt_get_machine_name(void ) { return NULL; }static inline void unflatten_device_tree(void ) {}static inline void unflatten_and_copy_device_tree(void ) {}#endif /* CONFIG_OF_EARLY_FLATTREE */ #endif /* __ASSEMBLY__ */ #endif /* _LINUX_OF_FDT_H */ quality 93%
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