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TOMOYO Linux Cross Reference
Linux/include/linux/mtd/partitions.h

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  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 };
 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 
 52 struct mtd_info;
 53 struct device_node;
 54 
 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  */
 59 struct mtd_part_parser_data {
 60         unsigned long origin;
 61 };
 62 
 63 
 64 /*
 65  * Functions dealing with the various ways of partitioning the space
 66  */
 67 
 68 struct mtd_part_parser {
 69         struct list_head list;
 70         struct module *owner;
 71         const char *name;
 72         int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
 73                         struct mtd_part_parser_data *);
 74         void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
 75 };
 76 
 77 /* Container for passing around a set of parsed partitions */
 78 struct mtd_partitions {
 79         const struct mtd_partition *parts;
 80         int nr_parts;
 81         const struct mtd_part_parser *parser;
 82 };
 83 
 84 extern int __register_mtd_parser(struct mtd_part_parser *parser,
 85                                  struct module *owner);
 86 #define register_mtd_parser(parser) __register_mtd_parser(parser, THIS_MODULE)
 87 
 88 extern void deregister_mtd_parser(struct mtd_part_parser *parser);
 89 
 90 /*
 91  * module_mtd_part_parser() - Helper macro for MTD partition parsers that don't
 92  * do anything special in module init/exit. Each driver may only use this macro
 93  * once, and calling it replaces module_init() and module_exit().
 94  */
 95 #define module_mtd_part_parser(__mtd_part_parser) \
 96         module_driver(__mtd_part_parser, register_mtd_parser, \
 97                       deregister_mtd_parser)
 98 
 99 int mtd_is_partition(const struct mtd_info *mtd);
100 int mtd_add_partition(struct mtd_info *master, const char *name,
101                       long long offset, long long length);
102 int mtd_del_partition(struct mtd_info *master, int partno);
103 uint64_t mtd_get_device_size(const struct mtd_info *mtd);
104 
105 #endif
106 

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