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 * Partition definition structure:
16 *
17 * An array of struct partition is passed along with a MTD object to
18 * mtd_device_register() to create them.
19 *
20 * For each partition, these fields are available:
21 * name: string that will be used to label the partition's MTD device.
22 * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
23 * will extend to the end of the master MTD device.
24 * offset: absolute starting position within the master MTD device; if
25 * defined as MTDPART_OFS_APPEND, the partition will start where the
26 * previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block;
27 * if MTDPART_OFS_RETAIN, consume as much as possible, leaving size
28 * after the end of partition.
29 * mask_flags: contains flags that have to be masked (removed) from the
30 * master MTD flag set for the corresponding MTD partition.
31 * For example, to force a read-only partition, simply adding
32 * MTD_WRITEABLE to the mask_flags will do the trick.
33 *
34 * Note: writeable partitions require their size and offset be
35 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
36 */
37
38 struct mtd_partition {
39 const char *name; /* identifier string */
40 uint64_t size; /* partition size */
41 uint64_t offset; /* offset within the master MTD space */
42 uint32_t mask_flags; /* master MTD flags to mask out for this partition */
43 struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */
44 };
45
46 #define MTDPART_OFS_RETAIN (-3)
47 #define MTDPART_OFS_NXTBLK (-2)
48 #define MTDPART_OFS_APPEND (-1)
49 #define MTDPART_SIZ_FULL (0)
50
51 struct mtd_info;
52 struct device_node;
53
54 #ifndef __UBOOT__
55 /**
56 * struct mtd_part_parser_data - used to pass data to MTD partition parsers.
57 * @origin: for RedBoot, start address of MTD device
58 * @of_node: for OF parsers, device node containing partitioning information
59 */
60 struct mtd_part_parser_data {
61 unsigned long origin;
62 struct device_node *of_node;
63 };
64
65 /*
66 * Functions dealing with the various ways of partitioning the space
67 */
68
69 struct mtd_part_parser {
70 struct list_head list;
71 struct module *owner;
72 const char *name;
73 int (*parse_fn)(struct mtd_info *, struct mtd_partition **,
74 struct mtd_part_parser_data *);
75 };
76
77 extern void register_mtd_parser(struct mtd_part_parser *parser);
78 extern void deregister_mtd_parser(struct mtd_part_parser *parser);
79 #endif
80
81 int mtd_add_partition(struct mtd_info *master, const char *name,
82 long long offset, long long length);
83 int mtd_del_partition(struct mtd_info *master, int partno);
84 uint64_t mtd_get_device_size(const struct mtd_info *mtd);
85
86 #if defined(CONFIG_MTD_PARTITIONS)
87 int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
88 struct mtd_partition **_parts, int *_nparts);
89 void mtd_free_parsed_partitions(struct mtd_partition *parts,
90 unsigned int nparts);
91 #else
92 static inline int
mtd_parse_partitions(struct mtd_info * parent,const char ** _mtdparts,struct mtd_partition ** _parts,int * _nparts)93 mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
94 struct mtd_partition **_parts, int *_nparts)
95 {
96 *_nparts = 0;
97
98 return 0;
99 }
100 static inline void
mtd_free_parsed_partitions(struct mtd_partition * parts,unsigned int nparts)101 mtd_free_parsed_partitions(struct mtd_partition *parts, unsigned int nparts)
102 {
103 return;
104 }
105 #endif /* defined(MTD_PARTITIONS) */
106
107 #endif
108