114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/*
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* MTD partitioning layer definitions
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*
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* (C) 2000 Nicolas Pitre <nico@fluxnic.net>
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*
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* This code is GPL
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*/
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#ifndef MTD_PARTITIONS_H
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#define MTD_PARTITIONS_H
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#include <linux/types.h>
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/*
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* Partition definition structure:
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*
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* An array of struct partition is passed along with a MTD object to
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* mtd_device_register() to create them.
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*
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* For each partition, these fields are available:
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* name: string that will be used to label the partition's MTD device.
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* types: some partitions can be containers using specific format to describe
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* embedded subpartitions / volumes. E.g. many home routers use "firmware"
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* partition that contains at least kernel and rootfs. In such case an
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* extra parser is needed that will detect these dynamic partitions and
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* report them to the MTD subsystem. If set this property stores an array
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* of parser names to use when looking for subpartitions.
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* size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
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* will extend to the end of the master MTD device.
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* offset: absolute starting position within the master MTD device; if
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* defined as MTDPART_OFS_APPEND, the partition will start where the
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* previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block;
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* if MTDPART_OFS_RETAIN, consume as much as possible, leaving size
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* after the end of partition.
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* mask_flags: contains flags that have to be masked (removed) from the
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* master MTD flag set for the corresponding MTD partition.
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* For example, to force a read-only partition, simply adding
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* MTD_WRITEABLE to the mask_flags will do the trick.
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*
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* Note: writeable partitions require their size and offset be
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* erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
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*/
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struct mtd_partition {
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const char *name; /* identifier string */
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const char *const *types; /* names of parsers to use if any */
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uint64_t size; /* partition size */
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uint64_t offset; /* offset within the master MTD space */
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uint32_t mask_flags; /* master MTD flags to mask out for this partition */
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struct device_node *of_node;
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};
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#define MTDPART_OFS_RETAIN (-3)
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#define MTDPART_OFS_NXTBLK (-2)
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#define MTDPART_OFS_APPEND (-1)
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#define MTDPART_SIZ_FULL (0)
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struct mtd_info;
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struct device_node;
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/**
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* struct mtd_part_parser_data - used to pass data to MTD partition parsers.
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* @origin: for RedBoot, start address of MTD device
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*/
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struct mtd_part_parser_data {
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unsigned long origin;
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};
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/*
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* Functions dealing with the various ways of partitioning the space
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*/
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struct mtd_part_parser {
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struct list_head list;
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struct module *owner;
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const char *name;
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int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
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struct mtd_part_parser_data *);
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void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
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};
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/* Container for passing around a set of parsed partitions */
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struct mtd_partitions {
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const struct mtd_partition *parts;
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int nr_parts;
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const struct mtd_part_parser *parser;
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};
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extern int __register_mtd_parser(struct mtd_part_parser *parser,
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struct module *owner);
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#define register_mtd_parser(parser) __register_mtd_parser(parser, THIS_MODULE)
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extern void deregister_mtd_parser(struct mtd_part_parser *parser);
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/*
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* module_mtd_part_parser() - Helper macro for MTD partition parsers that don't
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* do anything special in module init/exit. Each driver may only use this macro
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* once, and calling it replaces module_init() and module_exit().
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*/
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#define module_mtd_part_parser(__mtd_part_parser) \
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module_driver(__mtd_part_parser, register_mtd_parser, \
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deregister_mtd_parser)
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int mtd_is_partition(const struct mtd_info *mtd);
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int mtd_add_partition(struct mtd_info *master, const char *name,
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long long offset, long long length);
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int mtd_del_partition(struct mtd_info *master, int partno);
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uint64_t mtd_get_device_size(const struct mtd_info *mtd);
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#endif
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