| /* 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 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(unsigned long node, const char *uname, |
| int depth, void *data); |
| extern int early_init_dt_scan_memory(unsigned long node, const char *uname, |
| int depth, void *data); |
| 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 __init early_init_dt_scan_chosen_arch(unsigned long node); |
| extern void early_init_dt_add_memory_arch(u64 base, u64 size); |
| extern int early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size); |
| extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size, |
| bool no_map); |
| extern u64 dt_mem_next_cell(int s, const __be32 **cellp); |
| |
| /* Early flat tree scan hooks */ |
| extern int early_init_dt_scan_root(unsigned long node, const char *uname, |
| int depth, void *data); |
| |
| extern bool early_init_dt_scan(void *params); |
| extern bool early_init_dt_verify(void *params); |
| 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 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 */ |