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 *	if MTDPART_OFS_RETAIN, consume as much as possible, leaving size
29 *	after the end of partition.
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	const char *name;		/* identifier string */
41	uint64_t size;			/* partition size */
42	uint64_t offset;		/* offset within the master MTD space */
43	uint32_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};
46
47#define MTDPART_OFS_RETAIN	(-3)
48#define MTDPART_OFS_NXTBLK	(-2)
49#define MTDPART_OFS_APPEND	(-1)
50#define MTDPART_SIZ_FULL	(0)
51
52
53struct mtd_info;
54struct device_node;
55
56#ifndef __UBOOT__
57/**
58 * struct mtd_part_parser_data - used to pass data to MTD partition parsers.
59 * @origin: for RedBoot, start address of MTD device
60 * @of_node: for OF parsers, device node containing partitioning information
61 */
62struct mtd_part_parser_data {
63	unsigned long origin;
64	struct device_node *of_node;
65};
66
67
68/*
69 * Functions dealing with the various ways of partitioning the space
70 */
71
72struct mtd_part_parser {
73	struct list_head list;
74	struct module *owner;
75	const char *name;
76	int (*parse_fn)(struct mtd_info *, struct mtd_partition **,
77			struct mtd_part_parser_data *);
78};
79
80extern void register_mtd_parser(struct mtd_part_parser *parser);
81extern void deregister_mtd_parser(struct mtd_part_parser *parser);
82#endif
83
84int mtd_add_partition(struct mtd_info *master, const char *name,
85		      long long offset, long long length);
86int mtd_del_partition(struct mtd_info *master, int partno);
87uint64_t mtd_get_device_size(const struct mtd_info *mtd);
88
89#if defined(CONFIG_MTD_PARTITIONS)
90int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
91			 struct mtd_partition **_parts, int *_nparts);
92void mtd_free_parsed_partitions(struct mtd_partition *parts,
93				unsigned int nparts);
94#else
95static inline int
96mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
97		     struct mtd_partition **_parts, int *_nparts)
98{
99	*_nparts = 0;
100
101	return 0;
102}
103static inline void
104mtd_free_parsed_partitions(struct mtd_partition *parts, unsigned int nparts)
105{
106	return;
107}
108#endif /* defined(MTD_PARTITIONS) */
109
110#endif
111