source: svn/trunk/newcon3bcm2_21bu/toolchain/mips-linux-uclibc/include/linux/mtd/partitions.h

/*
 * MTD partitioning layer definitions
 *
 * (C) 2000 Nicolas Pitre <nico@cam.org>
 *
 * This code is GPL
 *
 */

#ifndef MTD_PARTITIONS_H
#define MTD_PARTITIONS_H

#include <linux/types.h>


/*
 * Partition definition structure:
 * 
 * An array of struct partition is passed along with a MTD object to
 * add_mtd_partitions() to create them.
 *
 * For each partition, these fields are available:
 * name: string that will be used to label the partition's MTD device.
 * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition 
 *      will extend to the end of the master MTD device.
 * offset: absolute starting position within the master MTD device; if 
 *      defined as MTDPART_OFS_APPEND, the partition will start where the 
 *      previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block.
 * mask_flags: contains flags that have to be masked (removed) from the 
 *      master MTD flag set for the corresponding MTD partition.
 *      For example, to force a read-only partition, simply adding 
 *      MTD_WRITEABLE to the mask_flags will do the trick.
 *
 * Note: writeable partitions require their size and offset be 
 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
 */ 

struct mtd_partition {
        char *name;                     /* identifier string */
        u_int32_t size;                 /* partition size */
        u_int32_t offset;               /* offset within the master MTD space */
        u_int32_t mask_flags;           /* master MTD flags to mask out for this partition */
        struct nand_oobinfo *oobsel;    /* out of band layout for this partition (NAND only)*/
        struct mtd_info **mtdp;         /* pointer to store the MTD object */
};

#define MTDPART_OFS_NXTBLK      (-2)
#define MTDPART_OFS_APPEND      (-1)
#define MTDPART_SIZ_FULL        (0)


int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
int del_mtd_partitions(struct mtd_info *);

/*
 * Functions dealing with the various ways of partitioning the space
 */

struct mtd_part_parser {
        struct list_head list;
        struct module *owner;
        const char *name;
        int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
};

extern int register_mtd_parser(struct mtd_part_parser *parser);
extern int deregister_mtd_parser(struct mtd_part_parser *parser);
extern int parse_mtd_partitions(struct mtd_info *master, const char **types, 
                                struct mtd_partition **pparts, unsigned long origin);

#define put_partition_parser(p) do { module_put((p)->owner); } while(0)

#endif