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marcus.erl |
/*
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* MTD partitioning layer definitions
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*
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* (C) 2000 Nicolas Pitre <nico@cam.org>
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*
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* This code is GPL
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*
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* $Id: partitions.h,v 1.17 2005/11/07 11:14:55 gleixner Exp $
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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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* add_mtd_partitions() 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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* 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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* 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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char *name; /* identifier string */
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u_int32_t size; /* partition size */
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u_int32_t offset; /* offset within the master MTD space */
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u_int32_t mask_flags; /* master MTD flags to mask out for this partition */
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struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only)*/
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struct mtd_info **mtdp; /* pointer to store the MTD object */
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};
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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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int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
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int del_mtd_partitions(struct mtd_info *);
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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 *, struct mtd_partition **, unsigned long);
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};
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extern int register_mtd_parser(struct mtd_part_parser *parser);
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extern int deregister_mtd_parser(struct mtd_part_parser *parser);
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extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
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struct mtd_partition **pparts, unsigned long origin);
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#define put_partition_parser(p) do { module_put((p)->owner); } while(0)
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#endif
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