include/linux/mtd/partitions.h

   1 /*
   2  * MTD partitioning layer definitions
   3  *
   4  * (C) 2000 Nicolas Pitre <nico@cam.org>
   5  *
   6  * This code is GPL
   7  *
   8  * $Id: partitions.h,v 1.17 2005/11/07 11:14:55 gleixner Exp $
   9  */
  10
  11 #ifndef MTD_PARTITIONS_H
  12 #define MTD_PARTITIONS_H
  13
  14 #include <linux/types.h>
  15
  16
  17 /*
  18  * Partition definition structure:
  19  *
  20  * An array of struct partition is passed along with a MTD object to
  21  * add_mtd_partitions() to create them.
  22  *
  23  * For each partition, these fields are available:
  24  * name: string that will be used to label the partition's MTD device.
  25  * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
  26  *      will extend to the end of the master MTD device.
  27  * offset: absolute starting position within the master MTD device; if
  28  *      defined as MTDPART_OFS_APPEND, the partition will start where the
  29  *      previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block.
  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         char *name;                     /* identifier string */
  41         u_int32_t size;                 /* partition size */
  42         u_int32_t offset;               /* offset within the master MTD space */
  43         u_int32_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         struct mtd_info **mtdp;         /* pointer to store the MTD object */
  46 };
  47
  48 #define MTDPART_OFS_NXTBLK      (-2)
  49 #define MTDPART_OFS_APPEND      (-1)
  50 #define MTDPART_SIZ_FULL        (0)
  51
  52
  53 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
  54 int del_mtd_partitions(struct mtd_info *);
  55
  56 /*
  57  * Functions dealing with the various ways of partitioning the space
  58  */
  59
  60 struct mtd_part_parser {
  61         struct list_head list;
  62         struct module *owner;
  63         const char *name;
  64         int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
  65 };
  66
  67 extern int register_mtd_parser(struct mtd_part_parser *parser);
  68 extern int deregister_mtd_parser(struct mtd_part_parser *parser);
  69 extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
  70                                 struct mtd_partition **pparts, unsigned long origin);
  71
  72 #define put_partition_parser(p) do { module_put((p)->owner); } while(0)
  73
  74 #endif
  75