1 /*
2 * MTD partitioning layer definitions
3 *
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
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 * add_mtd_partitions() 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
37 struct 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
50 struct mtd_info;
51
52 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
53 int del_mtd_partitions(struct mtd_info *);
54
55 /*
56 * Functions dealing with the various ways of partitioning the space
57 */
58
59 struct mtd_part_parser {
60 struct list_head list;
61 struct module *owner;
62 const char *name;
63 int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
64 };
65
66 extern int register_mtd_parser(struct mtd_part_parser *parser);
67 extern int deregister_mtd_parser(struct mtd_part_parser *parser);
68 extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
69 struct mtd_partition **pparts, unsigned long origin);
70
71 #define put_partition_parser(p) do { module_put((p)->owner); } while(0)
72
73 struct device;
74 struct device_node;
75
76 int __devinit of_mtd_parse_partitions(struct device *dev,
77 struct device_node *node,
78 struct mtd_partition **pparts);
79
80 #ifdef CONFIG_MTD_PARTITIONS
81 static inline int mtd_has_partitions(void) { return 1; }
82 #else
83 static inline int mtd_has_partitions(void) { return 0; }
84 #endif
85
86 #ifdef CONFIG_MTD_CMDLINE_PARTS
87 static inline int mtd_has_cmdlinepart(void) { return 1; }
88 #else
89 static inline int mtd_has_cmdlinepart(void) { return 0; }
90 #endif
91
92 #endif
93
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