partitions.h 3.2 KB

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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. #ifndef MTD_PARTITIONS_H
  9. #define MTD_PARTITIONS_H
  10. #include <linux/types.h>
  11. /*
  12. * Partition definition structure:
  13. *
  14. * An array of struct partition is passed along with a MTD object to
  15. * mtd_device_register() to create them.
  16. *
  17. * For each partition, these fields are available:
  18. * name: string that will be used to label the partition's MTD device.
  19. * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
  20. * will extend to the end of the master MTD device.
  21. * offset: absolute starting position within the master MTD device; if
  22. * defined as MTDPART_OFS_APPEND, the partition will start where the
  23. * previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block;
  24. * if MTDPART_OFS_RETAIN, consume as much as possible, leaving size
  25. * after the end of partition.
  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. const char *name; /* identifier string */
  36. uint64_t size; /* partition size */
  37. uint64_t offset; /* offset within the master MTD space */
  38. uint32_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. };
  41. #define MTDPART_OFS_RETAIN (-3)
  42. #define MTDPART_OFS_NXTBLK (-2)
  43. #define MTDPART_OFS_APPEND (-1)
  44. #define MTDPART_SIZ_FULL (0)
  45. struct mtd_info;
  46. struct device_node;
  47. #ifndef __UBOOT__
  48. /**
  49. * struct mtd_part_parser_data - used to pass data to MTD partition parsers.
  50. * @origin: for RedBoot, start address of MTD device
  51. * @of_node: for OF parsers, device node containing partitioning information
  52. */
  53. struct mtd_part_parser_data {
  54. unsigned long origin;
  55. struct device_node *of_node;
  56. };
  57. /*
  58. * Functions dealing with the various ways of partitioning the space
  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 **,
  65. struct mtd_part_parser_data *);
  66. };
  67. extern void register_mtd_parser(struct mtd_part_parser *parser);
  68. extern void deregister_mtd_parser(struct mtd_part_parser *parser);
  69. #endif
  70. int mtd_add_partition(struct mtd_info *master, const char *name,
  71. long long offset, long long length);
  72. int mtd_del_partition(struct mtd_info *master, int partno);
  73. uint64_t mtd_get_device_size(const struct mtd_info *mtd);
  74. #if defined(CONFIG_MTD_PARTITIONS)
  75. int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
  76. struct mtd_partition **_parts, int *_nparts);
  77. void mtd_free_parsed_partitions(struct mtd_partition *parts,
  78. unsigned int nparts);
  79. #else
  80. static inline int
  81. mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
  82. struct mtd_partition **_parts, int *_nparts)
  83. {
  84. *_nparts = 0;
  85. return 0;
  86. }
  87. static inline void
  88. mtd_free_parsed_partitions(struct mtd_partition *parts, unsigned int nparts)
  89. {
  90. return;
  91. }
  92. #endif /* defined(MTD_PARTITIONS) */
  93. #endif