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 * mtd_device_register() 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 * if MTDPART_OFS_RETAIN, consume as much as possible, leaving size 29 * after the end of partition. 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 const char *name; /* identifier string */ 41 uint64_t size; /* partition size */ 42 uint64_t offset; /* offset within the master MTD space */ 43 uint32_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 }; 46 47 #define MTDPART_OFS_RETAIN (-3) 48 #define MTDPART_OFS_NXTBLK (-2) 49 #define MTDPART_OFS_APPEND (-1) 50 #define MTDPART_SIZ_FULL (0) 51 52 53 struct mtd_info; 54 struct device_node; 55 56 #ifndef __UBOOT__ 57 /** 58 * struct mtd_part_parser_data - used to pass data to MTD partition parsers. 59 * @origin: for RedBoot, start address of MTD device 60 * @of_node: for OF parsers, device node containing partitioning information 61 */ 62 struct mtd_part_parser_data { 63 unsigned long origin; 64 struct device_node *of_node; 65 }; 66 67 68 /* 69 * Functions dealing with the various ways of partitioning the space 70 */ 71 72 struct mtd_part_parser { 73 struct list_head list; 74 struct module *owner; 75 const char *name; 76 int (*parse_fn)(struct mtd_info *, struct mtd_partition **, 77 struct mtd_part_parser_data *); 78 }; 79 80 extern void register_mtd_parser(struct mtd_part_parser *parser); 81 extern void deregister_mtd_parser(struct mtd_part_parser *parser); 82 #endif 83 84 int mtd_add_partition(struct mtd_info *master, const char *name, 85 long long offset, long long length); 86 int mtd_del_partition(struct mtd_info *master, int partno); 87 uint64_t mtd_get_device_size(const struct mtd_info *mtd); 88 89 #if defined(CONFIG_MTD_PARTITIONS) 90 int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts, 91 struct mtd_partition **_parts, int *_nparts); 92 void mtd_free_parsed_partitions(struct mtd_partition *parts, 93 unsigned int nparts); 94 #else 95 static inline int 96 mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts, 97 struct mtd_partition **_parts, int *_nparts) 98 { 99 *_nparts = 0; 100 101 return 0; 102 } 103 static inline void 104 mtd_free_parsed_partitions(struct mtd_partition *parts, unsigned int nparts) 105 { 106 return; 107 } 108 #endif /* defined(MTD_PARTITIONS) */ 109 110 #endif 111