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Diffstat (limited to 'include/linux/of_fdt.h')
| -rw-r--r-- | include/linux/of_fdt.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h new file mode 100644 index 000000000..d69ad5bb1 --- /dev/null +++ b/include/linux/of_fdt.h @@ -0,0 +1,97 @@ +/* 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(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 *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 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 */ |