of_fdt.h
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/* 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);
/*
* early_init_dt_scan_chosen - scan the device tree for ramdisk and bootargs
*
* The boot arguments will be placed into the memory pointed to by @data.
* That memory should be COMMAND_LINE_SIZE big and initialized to be a valid
* (possibly empty) string. Logic for what will be in @data after this
* function finishes:
*
* - CONFIG_CMDLINE_FORCE=true
* CONFIG_CMDLINE
* - CONFIG_CMDLINE_EXTEND=true, @data is non-empty string
* @data + dt bootargs (even if dt bootargs are empty)
* - CONFIG_CMDLINE_EXTEND=true, @data is empty string
* CONFIG_CMDLINE + dt bootargs (even if dt bootargs are empty)
* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=non-empty:
* dt bootargs
* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is non-empty string
* @data is left unchanged
* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is empty string
* CONFIG_CMDLINE (or "" if that's not defined)
*/
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 */