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 *dad,
  42                                    struct device_node **mynodes);
  43
  44 /* TBD: Temporary export of fdt globals - remove when code fully merged */
  45 extern int __initdata dt_root_addr_cells;
  46 extern int __initdata dt_root_size_cells;
  47 extern void *initial_boot_params;
  48
  49 extern char __dtb_start[];
  50 extern char __dtb_end[];
  51
  52 /* For scanning the flat device-tree at boot time */
  53 extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
  54                                      int depth, void *data),
  55                            void *data);
  56 extern int of_get_flat_dt_subnode_by_name(unsigned long node,
  57                                           const char *uname);
  58 extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
  59                                        int *size);
  60 extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
  61 extern int of_flat_dt_match(unsigned long node, const char *const *matches);
  62 extern unsigned long of_get_flat_dt_root(void);
  63 extern int of_get_flat_dt_size(void);
  64
  65 extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
  66                                      int depth, void *data);
  67 extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
  68                                      int depth, void *data);
  69 extern void early_init_fdt_scan_reserved_mem(void);
  70 extern void early_init_fdt_reserve_self(void);
  71 extern void early_init_dt_add_memory_arch(u64 base, u64 size);
  72 extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
  73                                              bool no_map);
  74 extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
  75 extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
  76
  77 /* Early flat tree scan hooks */
  78 extern int early_init_dt_scan_root(unsigned long node, const char *uname,
  79                                    int depth, void *data);
  80
  81 extern bool early_init_dt_scan(void *params);
  82 extern bool early_init_dt_verify(void *params);
  83 extern void early_init_dt_scan_nodes(void);
  84
  85 extern const char *of_flat_dt_get_machine_name(void);
  86 extern const void *of_flat_dt_match_machine(const void *default_match,
  87                 const void * (*get_next_compat)(const char * const**));
  88
  89 /* Other Prototypes */
  90 extern void unflatten_device_tree(void);
  91 extern void unflatten_and_copy_device_tree(void);
  92 extern void early_init_devtree(void *);
  93 extern void early_get_first_memblock_info(void *, phys_addr_t *);
  94 extern u64 of_flat_dt_translate_address(unsigned long node);
  95 extern void of_fdt_limit_memory(int limit);
  96 #else /* CONFIG_OF_FLATTREE */
  97 static inline void early_init_fdt_scan_reserved_mem(void) {}
  98 static inline void early_init_fdt_reserve_self(void) {}
  99 static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
 100 static inline void unflatten_device_tree(void) {}
 101 static inline void unflatten_and_copy_device_tree(void) {}
 102 #endif /* CONFIG_OF_FLATTREE */
 103
 104 #endif /* __ASSEMBLY__ */
 105 #endif /* _LINUX_OF_FDT_H */