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Diffstat (limited to 'include/linux/of_fdt.h')
| -rw-r--r-- | include/linux/of_fdt.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h new file mode 100644 index 00000000..ed136ad6 --- /dev/null +++ b/include/linux/of_fdt.h @@ -0,0 +1,125 @@ +/* + * Definitions for working with the Flattened Device Tree data format + * + * Copyright 2009 Benjamin Herrenschmidt, IBM Corp + * benh@kernel.crashing.org + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + */ + +#ifndef _LINUX_OF_FDT_H +#define _LINUX_OF_FDT_H + +#include <linux/types.h> +#include <linux/init.h> + +/* Definitions used by the flattened device tree */ +#define OF_DT_HEADER 0xd00dfeed /* marker */ +#define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */ +#define OF_DT_END_NODE 0x2 /* End node */ +#define OF_DT_PROP 0x3 /* Property: name off, size, + * content */ +#define OF_DT_NOP 0x4 /* nop */ +#define OF_DT_END 0x9 + +#define OF_DT_VERSION 0x10 + +#ifndef __ASSEMBLY__ +/* + * This is what gets passed to the kernel by prom_init or kexec + * + * The dt struct contains the device tree structure, full pathes and + * property contents. The dt strings contain a separate block with just + * the strings for the property names, and is fully page aligned and + * self contained in a page, so that it can be kept around by the kernel, + * each property name appears only once in this page (cheap compression) + * + * the mem_rsvmap contains a map of reserved ranges of physical memory, + * passing it here instead of in the device-tree itself greatly simplifies + * the job of everybody. It's just a list of u64 pairs (base/size) that + * ends when size is 0 + */ +struct boot_param_header { + __be32 magic; /* magic word OF_DT_HEADER */ + __be32 totalsize; /* total size of DT block */ + __be32 off_dt_struct; /* offset to structure */ + __be32 off_dt_strings; /* offset to strings */ + __be32 off_mem_rsvmap; /* offset to memory reserve map */ + __be32 version; /* format version */ + __be32 last_comp_version; /* last compatible version */ + /* version 2 fields below */ + __be32 boot_cpuid_phys; /* Physical CPU id we're booting on */ + /* version 3 fields below */ + __be32 dt_strings_size; /* size of the DT strings block */ + /* version 17 fields below */ + __be32 dt_struct_size; /* size of the DT structure block */ +}; + +#if defined(CONFIG_OF_FLATTREE) + +struct device_node; + +/* For scanning an arbitrary device-tree at any time */ +extern char *of_fdt_get_string(struct boot_param_header *blob, u32 offset); +extern void *of_fdt_get_property(struct boot_param_header *blob, + unsigned long node, + const char *name, + unsigned long *size); +extern int of_fdt_is_compatible(struct boot_param_header *blob, + unsigned long node, + const char *compat); +extern int of_fdt_match(struct boot_param_header *blob, unsigned long node, + const char *const *compat); +extern void of_fdt_unflatten_tree(unsigned long *blob, + 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 struct boot_param_header *initial_boot_params; + +/* For scanning the flat device-tree at boot time */ +extern char *find_flat_dt_string(u32 offset); +extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, + int depth, void *data), + void *data); +extern void *of_get_flat_dt_prop(unsigned long node, const char *name, + unsigned long *size); +extern int of_flat_dt_is_compatible(unsigned long node, const char *name); +extern int of_flat_dt_match(unsigned long node, const char *const *matches); +extern unsigned long of_get_flat_dt_root(void); + +extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, + int depth, void *data); +extern void early_init_dt_check_for_initrd(unsigned long node); +extern int early_init_dt_scan_memory(unsigned long node, const char *uname, + int depth, void *data); +extern void early_init_dt_add_memory_arch(u64 base, u64 size); +extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align); +extern u64 dt_mem_next_cell(int s, __be32 **cellp); + +/* + * If BLK_DEV_INITRD, the fdt early init code will call this function, + * to be provided by the arch code. start and end are specified as + * physical addresses. + */ +#ifdef CONFIG_BLK_DEV_INITRD +extern void early_init_dt_setup_initrd_arch(unsigned long start, + unsigned long end); +#endif + +/* Early flat tree scan hooks */ +extern int early_init_dt_scan_root(unsigned long node, const char *uname, + int depth, void *data); + +/* Other Prototypes */ +extern void unflatten_device_tree(void); +extern void early_init_devtree(void *); +#else /* CONFIG_OF_FLATTREE */ +static inline void unflatten_device_tree(void) {} +#endif /* CONFIG_OF_FLATTREE */ + +#endif /* __ASSEMBLY__ */ +#endif /* _LINUX_OF_FDT_H */ |