include/linux/of_fdt.h

   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
  25 struct device_node;
  26
  27 /* For scanning an arbitrary device-tree at any time */
  28 extern char *of_fdt_get_string(const void *blob, u32 offset);
  29 extern void *of_fdt_get_property(const void *blob,
  30                                  unsigned long node,
  31                                  const char *name,
  32                                  int *size);
  33 extern int of_fdt_is_compatible(const void *blob,
  34                                 unsigned long node,
  35                                 const char *compat);
  36 extern bool of_fdt_is_big_endian(const void *blob,
  37                                  unsigned long node);
  38 extern int of_fdt_match(const void *blob, unsigned long node,
  39                         const char *const *compat);
  40 extern 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 */
  44 extern int __initdata dt_root_addr_cells;
  45 extern int __initdata dt_root_size_cells;
  46 extern void *initial_boot_params;
  47
  48 extern char __dtb_start[];
  49 extern char __dtb_end[];
  50
  51 /* For scanning the flat device-tree at boot time */
  52 extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
  53                                      int depth, void *data),
  54                            void *data);
  55 extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
  56                                        int *size);
  57 extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
  58 extern int of_flat_dt_match(unsigned long node, const char *const *matches);
  59 extern unsigned long of_get_flat_dt_root(void);
  60 extern int of_get_flat_dt_size(void);
  61
  62 extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
  63                                      int depth, void *data);
  64 extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
  65                                      int depth, void *data);
  66 extern void early_init_fdt_scan_reserved_mem(void);
  67 extern void early_init_fdt_reserve_self(void);
  68 extern void early_init_dt_add_memory_arch(u64 base, u64 size);
  69 extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
  70                                              bool no_map);
  71 extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
  72 extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
  73
  74 /* Early flat tree scan hooks */
  75 extern int early_init_dt_scan_root(unsigned long node, const char *uname,
  76                                    int depth, void *data);
  77
  78 extern bool early_init_dt_scan(void *params);
  79 extern bool early_init_dt_verify(void *params);
  80 extern void early_init_dt_scan_nodes(void);
  81
  82 extern const char *of_flat_dt_get_machine_name(void);
  83 extern const void *of_flat_dt_match_machine(const void *default_match,
  84                 const void * (*get_next_compat)(const char * const**));
  85
  86 /* Other Prototypes */
  87 extern void unflatten_device_tree(void);
  88 extern void unflatten_and_copy_device_tree(void);
  89 extern void early_init_devtree(void *);
  90 extern void early_get_first_memblock_info(void *, phys_addr_t *);
  91 extern u64 of_flat_dt_translate_address(unsigned long node);
  92 extern void of_fdt_limit_memory(int limit);
  93 #else /* CONFIG_OF_FLATTREE */
  94 static inline void early_init_fdt_scan_reserved_mem(void) {}
  95 static inline void early_init_fdt_reserve_self(void) {}
  96 static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
  97 static inline void unflatten_device_tree(void) {}
  98 static inline void unflatten_and_copy_device_tree(void) {}
  99 #endif /* CONFIG_OF_FLATTREE */
 100
 101 #endif /* __ASSEMBLY__ */
 102 #endif /* _LINUX_OF_FDT_H */