partitions.h 2.4 KB

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  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 1.1.1.1 2007/06/12 07:27:16 eyryu Exp $
  9. */
  10. #ifndef MTD_PARTITIONS_H
  11. #define MTD_PARTITIONS_H
  12. #include <linux/types.h>
  13. /*
  14. * Partition definition structure:
  15. *
  16. * An array of struct partition is passed along with a MTD object to
  17. * add_mtd_partitions() to create them.
  18. *
  19. * For each partition, these fields are available:
  20. * name: string that will be used to label the partition's MTD device.
  21. * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
  22. * will extend to the end of the master MTD device.
  23. * offset: absolute starting position within the master MTD device; if
  24. * defined as MTDPART_OFS_APPEND, the partition will start where the
  25. * previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block.
  26. * mask_flags: contains flags that have to be masked (removed) from the
  27. * master MTD flag set for the corresponding MTD partition.
  28. * For example, to force a read-only partition, simply adding
  29. * MTD_WRITEABLE to the mask_flags will do the trick.
  30. *
  31. * Note: writeable partitions require their size and offset be
  32. * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
  33. */
  34. struct mtd_partition {
  35. char *name; /* identifier string */
  36. u_int32_t size; /* partition size */
  37. u_int32_t offset; /* offset within the master MTD space */
  38. u_int32_t mask_flags; /* master MTD flags to mask out for this partition */
  39. struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only)*/
  40. struct mtd_info **mtdp; /* pointer to store the MTD object */
  41. };
  42. #define MTDPART_OFS_NXTBLK (-2)
  43. #define MTDPART_OFS_APPEND (-1)
  44. #define MTDPART_SIZ_FULL (0)
  45. int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
  46. int del_mtd_partitions(struct mtd_info *);
  47. /*
  48. * Functions dealing with the various ways of partitioning the space
  49. */
  50. struct mtd_part_parser {
  51. struct list_head list;
  52. struct module *owner;
  53. const char *name;
  54. int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
  55. };
  56. extern int register_mtd_parser(struct mtd_part_parser *parser);
  57. extern int deregister_mtd_parser(struct mtd_part_parser *parser);
  58. extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
  59. struct mtd_partition **pparts, unsigned long origin);
  60. #define put_partition_parser(p) do { module_put((p)->owner); } while(0)
  61. #endif