LXR linux/include/linux/mtd/partitions.h

   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 * add_mtd_partitions() 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 * mask_flags: contains flags that have to be masked (removed) from the
  29 *      master MTD flag set for the corresponding MTD partition.
  30 *      For example, to force a read-only partition, simply adding
  31 *      MTD_WRITEABLE to the mask_flags will do the trick.
  32 *
  33 * Note: writeable partitions require their size and offset be
  34 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
  35 */
  36
  37struct mtd_partition {
  38        char *name;                     /* identifier string */
  39        uint64_t size;                  /* partition size */
  40        uint64_t offset;                /* offset within the master MTD space */
  41        uint32_t mask_flags;            /* master MTD flags to mask out for this partition */
  42        struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only) */
  43};
  44
  45#define MTDPART_OFS_NXTBLK      (-2)
  46#define MTDPART_OFS_APPEND      (-1)
  47#define MTDPART_SIZ_FULL        (0)
  48
  49
  50struct mtd_info;
  51
  52int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
  53int del_mtd_partitions(struct mtd_info *);
  54
  55/*
  56 * Functions dealing with the various ways of partitioning the space
  57 */
  58
  59struct mtd_part_parser {
  60        struct list_head list;
  61        struct module *owner;
  62        const char *name;
  63        int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
  64};
  65
  66extern int register_mtd_parser(struct mtd_part_parser *parser);
  67extern int deregister_mtd_parser(struct mtd_part_parser *parser);
  68extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
  69                                struct mtd_partition **pparts, unsigned long origin);
  70
  71#define put_partition_parser(p) do { module_put((p)->owner); } while(0)
  72
  73struct device;
  74struct device_node;
  75
  76int __devinit of_mtd_parse_partitions(struct device *dev,
  77                                      struct device_node *node,
  78                                      struct mtd_partition **pparts);
  79
  80#ifdef CONFIG_MTD_PARTITIONS
  81static inline int mtd_has_partitions(void) { return 1; }
  82#else
  83static inline int mtd_has_partitions(void) { return 0; }
  84#endif
  85
  86#ifdef CONFIG_MTD_CMDLINE_PARTS
  87static inline int mtd_has_cmdlinepart(void) { return 1; }
  88#else
  89static inline int mtd_has_cmdlinepart(void) { return 0; }
  90#endif
  91
  92int mtd_is_partition(struct mtd_info *mtd);
  93int mtd_add_partition(struct mtd_info *master, char *name,
  94                      long long offset, long long length);
  95int mtd_del_partition(struct mtd_info *master, int partno);
  96
  97#endif
  98