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1da177e4 LT |
1 | /* |
2 | * MTD partitioning layer definitions | |
3 | * | |
2f82af08 | 4 | * (C) 2000 Nicolas Pitre <nico@fluxnic.net> |
1da177e4 LT |
5 | * |
6 | * This code is GPL | |
1da177e4 LT |
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: | |
61ecfa87 | 17 | * |
1da177e4 | 18 | * An array of struct partition is passed along with a MTD object to |
f5671ab3 | 19 | * mtd_device_register() to create them. |
1da177e4 LT |
20 | * |
21 | * For each partition, these fields are available: | |
22 | * name: string that will be used to label the partition's MTD device. | |
61ecfa87 | 23 | * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition |
1da177e4 | 24 | * will extend to the end of the master MTD device. |
61ecfa87 TG |
25 | * offset: absolute starting position within the master MTD device; if |
26 | * defined as MTDPART_OFS_APPEND, the partition will start where the | |
1a31368b DES |
27 | * previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block; |
28 | * if MTDPART_OFS_RETAIN, consume as much as possible, leaving size | |
29 | * after the end of partition. | |
61ecfa87 | 30 | * mask_flags: contains flags that have to be masked (removed) from the |
1da177e4 | 31 | * master MTD flag set for the corresponding MTD partition. |
61ecfa87 | 32 | * For example, to force a read-only partition, simply adding |
1da177e4 LT |
33 | * MTD_WRITEABLE to the mask_flags will do the trick. |
34 | * | |
61ecfa87 | 35 | * Note: writeable partitions require their size and offset be |
1da177e4 | 36 | * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK). |
61ecfa87 | 37 | */ |
1da177e4 LT |
38 | |
39 | struct mtd_partition { | |
40 | char *name; /* identifier string */ | |
69423d99 AH |
41 | uint64_t size; /* partition size */ |
42 | uint64_t offset; /* offset within the master MTD space */ | |
26cdb67c | 43 | uint32_t mask_flags; /* master MTD flags to mask out for this partition */ |
cc26c3cd | 44 | struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */ |
1da177e4 LT |
45 | }; |
46 | ||
1a31368b | 47 | #define MTDPART_OFS_RETAIN (-3) |
1da177e4 LT |
48 | #define MTDPART_OFS_NXTBLK (-2) |
49 | #define MTDPART_OFS_APPEND (-1) | |
50 | #define MTDPART_SIZ_FULL (0) | |
51 | ||
52 | ||
7699ad35 | 53 | struct mtd_info; |
d26c87d6 | 54 | struct device_node; |
7699ad35 | 55 | |
c7975330 DES |
56 | /** |
57 | * struct mtd_part_parser_data - used to pass data to MTD partition parsers. | |
58 | * @origin: for RedBoot, start address of MTD device | |
d26c87d6 | 59 | * @of_node: for OF parsers, device node containing partitioning information |
c7975330 DES |
60 | */ |
61 | struct mtd_part_parser_data { | |
62 | unsigned long origin; | |
d26c87d6 | 63 | struct device_node *of_node; |
c7975330 DES |
64 | }; |
65 | ||
66 | ||
1da177e4 LT |
67 | /* |
68 | * Functions dealing with the various ways of partitioning the space | |
69 | */ | |
70 | ||
71 | struct mtd_part_parser { | |
72 | struct list_head list; | |
73 | struct module *owner; | |
74 | const char *name; | |
c7975330 DES |
75 | int (*parse_fn)(struct mtd_info *, struct mtd_partition **, |
76 | struct mtd_part_parser_data *); | |
1da177e4 LT |
77 | }; |
78 | ||
79 | extern int register_mtd_parser(struct mtd_part_parser *parser); | |
80 | extern int deregister_mtd_parser(struct mtd_part_parser *parser); | |
1da177e4 | 81 | |
5dee4674 | 82 | int mtd_is_partition(const struct mtd_info *mtd); |
5daa7b21 RT |
83 | int mtd_add_partition(struct mtd_info *master, char *name, |
84 | long long offset, long long length); | |
85 | int mtd_del_partition(struct mtd_info *master, int partno); | |
62082e56 | 86 | uint64_t mtd_get_device_size(const struct mtd_info *mtd); |
5daa7b21 | 87 | |
9a310d21 | 88 | #endif |