2 * MTD partitioning layer definitions
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
8 * $Id: partitions.h,v 1.17 2005/11/07 11:14:55 gleixner Exp $
11 #ifndef MTD_PARTITIONS_H
12 #define MTD_PARTITIONS_H
14 #include <linux/types.h>
18 * Partition definition structure:
20 * An array of struct partition is passed along with a MTD object to
21 * add_mtd_partitions() to create them.
23 * For each partition, these fields are available:
24 * name: string that will be used to label the partition's MTD device.
25 * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
26 * will extend to the end of the master MTD device.
27 * offset: absolute starting position within the master MTD device; if
28 * defined as MTDPART_OFS_APPEND, the partition will start where the
29 * previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block.
30 * mask_flags: contains flags that have to be masked (removed) from the
31 * master MTD flag set for the corresponding MTD partition.
32 * For example, to force a read-only partition, simply adding
33 * MTD_WRITEABLE to the mask_flags will do the trick.
35 * Note: writeable partitions require their size and offset be
36 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
39 struct mtd_partition {
40 char *name; /* identifier string */
41 u_int32_t size; /* partition size */
42 u_int32_t offset; /* offset within the master MTD space */
43 u_int32_t mask_flags; /* master MTD flags to mask out for this partition */
44 struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only)*/
45 struct mtd_info **mtdp; /* pointer to store the MTD object */
48 #define MTDPART_OFS_NXTBLK (-2)
49 #define MTDPART_OFS_APPEND (-1)
50 #define MTDPART_SIZ_FULL (0)
53 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
54 int del_mtd_partitions(struct mtd_info *);
57 * Functions dealing with the various ways of partitioning the space
60 struct mtd_part_parser {
61 struct list_head list;
64 int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
67 extern int register_mtd_parser(struct mtd_part_parser *parser);
68 extern int deregister_mtd_parser(struct mtd_part_parser *parser);
69 extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
70 struct mtd_partition **pparts, unsigned long origin);
72 #define put_partition_parser(p) do { module_put((p)->owner); } while(0)