xref: /openbmc/u-boot/include/linux/mtd/partitions.h (revision 2e0c1c7d)
1 /*
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 1.17 2005/11/07 11:14:55 gleixner 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 
39 struct mtd_partition {
40 	char *name;			/* identifier string */
41 	uint64_t size;			/* partition size */
42 	uint64_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 */
46 };
47 
48 #define MTDPART_OFS_NXTBLK	(-2)
49 #define MTDPART_OFS_APPEND	(-1)
50 #define MTDPART_SIZ_FULL	(0)
51 
52 
53 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
54 int del_mtd_partitions(struct mtd_info *);
55 
56 #if 0
57 /*
58  * Functions dealing with the various ways of partitioning the space
59  */
60 
61 struct mtd_part_parser {
62 	struct list_head list;
63 	struct module *owner;
64 	const char *name;
65 	int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
66 };
67 
68 extern int register_mtd_parser(struct mtd_part_parser *parser);
69 extern int deregister_mtd_parser(struct mtd_part_parser *parser);
70 extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
71 				struct mtd_partition **pparts, unsigned long origin);
72 
73 #define put_partition_parser(p) do { module_put((p)->owner); } while(0)
74 
75 struct device;
76 struct device_node;
77 
78 int __devinit of_mtd_parse_partitions(struct device *dev,
79 				      struct mtd_info *mtd,
80 				      struct device_node *node,
81 				      struct mtd_partition **pparts);
82 #endif
83 
84 #endif
85