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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * MTD partitioning layer definitions
3 *
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
5 *
6 * This code is GPL
7 *
8 * $Id: partitions.h,v 1.16 2004/11/16 18:34:40 dwmw2 Exp $
9 */
10
11#ifndef MTD_PARTITIONS_H
12#define MTD_PARTITIONS_H
13
14#include <linux/types.h>
15
16
17/*
18 * Partition definition structure:
19 *
20 * An array of struct partition is passed along with a MTD object to
21 * add_mtd_partitions() to create them.
22 *
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.
34 *
35 * Note: writeable partitions require their size and offset be
36 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
37 */
38
39struct 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_oobinfo *oobsel; /* out of band layout for this partition (NAND only)*/
45 struct mtd_info **mtdp; /* pointer to store the MTD object */
46};
47
48#define MTDPART_OFS_NXTBLK (-2)
49#define MTDPART_OFS_APPEND (-1)
50#define MTDPART_SIZ_FULL (0)
51
52
53int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
54int del_mtd_partitions(struct mtd_info *);
55
56/*
57 * Functions dealing with the various ways of partitioning the space
58 */
59
60struct mtd_part_parser {
61 struct list_head list;
62 struct module *owner;
63 const char *name;
64 int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
65};
66
67extern int register_mtd_parser(struct mtd_part_parser *parser);
68extern int deregister_mtd_parser(struct mtd_part_parser *parser);
69extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
70 struct mtd_partition **pparts, unsigned long origin);
71
72#define put_partition_parser(p) do { module_put((p)->owner); } while(0)
73
74#endif
75