diff options
Diffstat (limited to 'include/linux/of_fdt.h')
| -rw-r--r-- | include/linux/of_fdt.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h new file mode 100644 index 000000000000..a1ca92ccb0ff --- /dev/null +++ b/include/linux/of_fdt.h | |||
| @@ -0,0 +1,103 @@ | |||
| 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 | #define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */ | ||
| 21 | #define OF_DT_END_NODE 0x2 /* End node */ | ||
| 22 | #define OF_DT_PROP 0x3 /* Property: name off, size, | ||
| 23 | * content */ | ||
| 24 | #define OF_DT_NOP 0x4 /* nop */ | ||
| 25 | #define OF_DT_END 0x9 | ||
| 26 | |||
| 27 | #define OF_DT_VERSION 0x10 | ||
| 28 | |||
| 29 | #ifndef __ASSEMBLY__ | ||
| 30 | /* | ||
| 31 | * This is what gets passed to the kernel by prom_init or kexec | ||
| 32 | * | ||
| 33 | * The dt struct contains the device tree structure, full pathes and | ||
| 34 | * property contents. The dt strings contain a separate block with just | ||
| 35 | * the strings for the property names, and is fully page aligned and | ||
| 36 | * self contained in a page, so that it can be kept around by the kernel, | ||
| 37 | * each property name appears only once in this page (cheap compression) | ||
| 38 | * | ||
| 39 | * the mem_rsvmap contains a map of reserved ranges of physical memory, | ||
| 40 | * passing it here instead of in the device-tree itself greatly simplifies | ||
| 41 | * the job of everybody. It's just a list of u64 pairs (base/size) that | ||
| 42 | * ends when size is 0 | ||
| 43 | */ | ||
| 44 | struct boot_param_header { | ||
| 45 | __be32 magic; /* magic word OF_DT_HEADER */ | ||
| 46 | __be32 totalsize; /* total size of DT block */ | ||
| 47 | __be32 off_dt_struct; /* offset to structure */ | ||
| 48 | __be32 off_dt_strings; /* offset to strings */ | ||
| 49 | __be32 off_mem_rsvmap; /* offset to memory reserve map */ | ||
| 50 | __be32 version; /* format version */ | ||
| 51 | __be32 last_comp_version; /* last compatible version */ | ||
| 52 | /* version 2 fields below */ | ||
| 53 | __be32 boot_cpuid_phys; /* Physical CPU id we're booting on */ | ||
| 54 | /* version 3 fields below */ | ||
| 55 | __be32 dt_strings_size; /* size of the DT strings block */ | ||
| 56 | /* version 17 fields below */ | ||
| 57 | __be32 dt_struct_size; /* size of the DT structure block */ | ||
| 58 | }; | ||
| 59 | |||
| 60 | /* TBD: Temporary export of fdt globals - remove when code fully merged */ | ||
| 61 | extern int __initdata dt_root_addr_cells; | ||
| 62 | extern int __initdata dt_root_size_cells; | ||
| 63 | extern struct boot_param_header *initial_boot_params; | ||
| 64 | |||
| 65 | /* For scanning the flat device-tree at boot time */ | ||
| 66 | extern char *find_flat_dt_string(u32 offset); | ||
| 67 | extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, | ||
| 68 | int depth, void *data), | ||
| 69 | void *data); | ||
| 70 | extern void *of_get_flat_dt_prop(unsigned long node, const char *name, | ||
| 71 | unsigned long *size); | ||
| 72 | extern int of_flat_dt_is_compatible(unsigned long node, const char *name); | ||
| 73 | extern unsigned long of_get_flat_dt_root(void); | ||
| 74 | extern void early_init_dt_scan_chosen_arch(unsigned long node); | ||
| 75 | extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, | ||
| 76 | int depth, void *data); | ||
| 77 | extern void early_init_dt_check_for_initrd(unsigned long node); | ||
| 78 | extern int early_init_dt_scan_memory(unsigned long node, const char *uname, | ||
| 79 | int depth, void *data); | ||
| 80 | extern void early_init_dt_add_memory_arch(u64 base, u64 size); | ||
| 81 | extern u64 early_init_dt_alloc_memory_arch(u64 size, u64 align); | ||
| 82 | extern u64 dt_mem_next_cell(int s, __be32 **cellp); | ||
| 83 | |||
| 84 | /* | ||
| 85 | * If BLK_DEV_INITRD, the fdt early init code will call this function, | ||
| 86 | * to be provided by the arch code. start and end are specified as | ||
| 87 | * physical addresses. | ||
| 88 | */ | ||
| 89 | #ifdef CONFIG_BLK_DEV_INITRD | ||
| 90 | extern void early_init_dt_setup_initrd_arch(unsigned long start, | ||
| 91 | unsigned long end); | ||
| 92 | #endif | ||
| 93 | |||
| 94 | /* Early flat tree scan hooks */ | ||
| 95 | extern int early_init_dt_scan_root(unsigned long node, const char *uname, | ||
| 96 | int depth, void *data); | ||
| 97 | |||
| 98 | /* Other Prototypes */ | ||
| 99 | extern void unflatten_device_tree(void); | ||
| 100 | extern void early_init_devtree(void *); | ||
| 101 | |||
| 102 | #endif /* __ASSEMBLY__ */ | ||
| 103 | #endif /* _LINUX_OF_FDT_H */ | ||