1 /* 2 * MTD partitioning layer definitions 3 * 4 * (C) 2000 Nicolas Pitre <nico (at) 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 76
