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
39 struct 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
53 struct mtd_info;
54 struct 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 */
62 struct 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
72 struct 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
80 extern void register_mtd_parser(struct mtd_part_parser *parser);
81 extern void deregister_mtd_parser(struct mtd_part_parser *parser);
82 #endif
83
84 int mtd_add_partition(struct mtd_info *master, const char *name,
85 long long offset, long long length);
86 int mtd_del_partition(struct mtd_info *master, int partno);
87 uint64_t mtd_get_device_size(const struct mtd_info *mtd);
88
89 #if defined(CONFIG_MTD_PARTITIONS)
90 int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
91 struct mtd_partition **_parts, int *_nparts);
92 void mtd_free_parsed_partitions(struct mtd_partition *parts,
93 unsigned int nparts);
94 #else
95 static inline int
mtd_parse_partitions(struct mtd_info * parent,const char ** _mtdparts,struct mtd_partition ** _parts,int * _nparts)96 mtd_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 }
103 static inline void
mtd_free_parsed_partitions(struct mtd_partition * parts,unsigned int nparts)104 mtd_free_parsed_partitions(struct mtd_partition *parts, unsigned int nparts)
105 {
106 return;
107 }
108 #endif /* defined(MTD_PARTITIONS) */
109
110 #endif
111