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 37 struct 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 50 struct mtd_info; 51 52 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int); 53 int del_mtd_partitions(struct mtd_info *); 54 55 /* 56 * Functions dealing with the various ways of partitioning the space 57 */ 58 59 struct 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 66 extern int register_mtd_parser(struct mtd_part_parser *parser); 67 extern int deregister_mtd_parser(struct mtd_part_parser *parser); 68 extern 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 73 struct device; 74 struct device_node; 75 76 int __devinit of_mtd_parse_partitions(struct device *dev, 77 struct device_node *node, 78 struct mtd_partition **pparts); 79 80 #ifdef CONFIG_MTD_PARTITIONS 81 static inline int mtd_has_partitions(void) { return 1; } 82 #else 83 static inline int mtd_has_partitions(void) { return 0; } 84 #endif 85 86 #ifdef CONFIG_MTD_CMDLINE_PARTS 87 static inline int mtd_has_cmdlinepart(void) { return 1; } 88 #else 89 static inline int mtd_has_cmdlinepart(void) { return 0; } 90 #endif 91 92 int mtd_is_master(struct mtd_info *mtd); 93 int mtd_add_partition(struct mtd_info *master, char *name, 94 long long offset, long long length); 95 int mtd_del_partition(struct mtd_info *master, int partno); 96 97 #endif 98