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1/*
2 * MTD partitioning layer definitions
3 *
4 * (C) 2000 Nicolas Pitre <nico@fluxnic.net>
5 *
6 * This code is GPL
7 */
8
9#ifndef MTD_PARTITIONS_H
10#define MTD_PARTITIONS_H
11
12#include <linux/types.h>
13
14
15/*
16 * Partition definition structure:
17 *
18 * An array of struct partition is passed along with a MTD object to
19 * mtd_device_register() to create them.
20 *
21 * For each partition, these fields are available:
22 * name: string that will be used to label the partition's MTD device.
23 * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
24 * will extend to the end of the master MTD device.
25 * offset: absolute starting position within the master MTD device; if
26 * defined as MTDPART_OFS_APPEND, the partition will start where the
27 * previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block.
28 * mask_flags: contains flags that have to be masked (removed) from the
29 * master MTD flag set for the corresponding MTD partition.
30 * For example, to force a read-only partition, simply adding
31 * MTD_WRITEABLE to the mask_flags will do the trick.
32 *
33 * Note: writeable partitions require their size and offset be
34 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
35 */
36
37struct mtd_partition {
38 char *name; /* identifier string */
39 uint64_t size; /* partition size */
40 uint64_t offset; /* offset within the master MTD space */
41 uint32_t mask_flags; /* master MTD flags to mask out for this partition */
42 struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */
43};
44
45#define MTDPART_OFS_NXTBLK (-2)
46#define MTDPART_OFS_APPEND (-1)
47#define MTDPART_SIZ_FULL (0)
48
49
50struct mtd_info;
51
52/*
53 * Functions dealing with the various ways of partitioning the space
54 */
55
56struct mtd_part_parser {
57 struct list_head list;
58 struct module *owner;
59 const char *name;
60 int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
61};
62
63extern int register_mtd_parser(struct mtd_part_parser *parser);
64extern int deregister_mtd_parser(struct mtd_part_parser *parser);
65extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
66 struct mtd_partition **pparts, unsigned long origin);
67
68#define put_partition_parser(p) do { module_put((p)->owner); } while(0)
69
70struct device;
71struct device_node;
72
73#ifdef CONFIG_MTD_OF_PARTS
74int __devinit of_mtd_parse_partitions(struct device *dev,
75 struct device_node *node,
76 struct mtd_partition **pparts);
77#else
78static inline int of_mtd_parse_partitions(struct device *dev,
79 struct device_node *node,
80 struct mtd_partition **pparts)
81{
82 return 0;
83}
84#endif
85
86#ifdef CONFIG_MTD_CMDLINE_PARTS
87static inline int mtd_has_cmdlinepart(void) { return 1; }
88#else
89static inline int mtd_has_cmdlinepart(void) { return 0; }
90#endif
91
92int mtd_is_partition(struct mtd_info *mtd);
93int mtd_add_partition(struct mtd_info *master, char *name,
94 long long offset, long long length);
95int mtd_del_partition(struct mtd_info *master, int partno);
96
97#endif