LXR linux/include/linux/of

   1/*
   2 * Definitions for working with the Flattened Device Tree data format
   3 *
   4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
   5 * benh@kernel.crashing.org
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * version 2 as published by the Free Software Foundation.
  10 */
  11
  12#ifndef _LINUX_OF_FDT_H
  13#define _LINUX_OF_FDT_H
  14
  15#include <linux/types.h>
  16#include <linux/init.h>
  17
  18/* Definitions used by the flattened device tree */
  19#define OF_DT_HEADER            0xd00dfeed      /* marker */
  20
  21#ifndef __ASSEMBLY__
  22
  23#if defined(CONFIG_OF_FLATTREE)
  24
  25struct device_node;
  26
  27/* For scanning an arbitrary device-tree at any time */
  28extern char *of_fdt_get_string(const void *blob, u32 offset);
  29extern void *of_fdt_get_property(const void *blob,
  30                                 unsigned long node,
  31                                 const char *name,
  32                                 int *size);
  33extern int of_fdt_is_compatible(const void *blob,
  34                                unsigned long node,
  35                                const char *compat);
  36extern bool of_fdt_is_big_endian(const void *blob,
  37                                 unsigned long node);
  38extern int of_fdt_match(const void *blob, unsigned long node,
  39                        const char *const *compat);
  40extern void of_fdt_unflatten_tree(const unsigned long *blob,
  41                               struct device_node **mynodes);
  42
  43/* TBD: Temporary export of fdt globals - remove when code fully merged */
  44extern int __initdata dt_root_addr_cells;
  45extern int __initdata dt_root_size_cells;
  46extern void *initial_boot_params;
  47
  48extern char __dtb_start[];
  49extern char __dtb_end[];
  50
  51/* For scanning the flat device-tree at boot time */
  52extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
  53                                     int depth, void *data),
  54                           void *data);
  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 int of_flat_dt_match(unsigned long node, const char *const *matches);
  59extern unsigned long of_get_flat_dt_root(void);
  60extern int of_get_flat_dt_size(void);
  61
  62extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
  63                                     int depth, void *data);
  64extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
  65                                     int depth, void *data);
  66extern void early_init_fdt_scan_reserved_mem(void);
  67extern void early_init_fdt_reserve_self(void);
  68extern void early_init_dt_add_memory_arch(u64 base, u64 size);
  69extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
  70                                             bool no_map);
  71extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
  72extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
  73
  74/* Early flat tree scan hooks */
  75extern int early_init_dt_scan_root(unsigned long node, const char *uname,
  76                                   int depth, void *data);
  77
  78extern bool early_init_dt_scan(void *params);
  79extern bool early_init_dt_verify(void *params);
  80extern void early_init_dt_scan_nodes(void);
  81
  82extern const char *of_flat_dt_get_machine_name(void);
  83extern const void *of_flat_dt_match_machine(const void *default_match,
  84                const void * (*get_next_compat)(const char * const**));
  85
  86/* Other Prototypes */
  87extern void unflatten_device_tree(void);
  88extern void unflatten_and_copy_device_tree(void);
  89extern void early_init_devtree(void *);
  90extern void early_get_first_memblock_info(void *, phys_addr_t *);
  91extern u64 of_flat_dt_translate_address(unsigned long node);
  92extern void of_fdt_limit_memory(int limit);
  93#else /* CONFIG_OF_FLATTREE */
  94static inline void early_init_fdt_scan_reserved_mem(void) {}
  95static inline void early_init_fdt_reserve_self(void) {}
  96static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
  97static inline void unflatten_device_tree(void) {}
  98static inline void unflatten_and_copy_device_tree(void) {}
  99#endif /* CONFIG_OF_FLATTREE */
 100
 101#endif /* __ASSEMBLY__ */
 102#endif /* _LINUX_OF_FDT_H */
 103