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1/*2 * MTD partitioning layer definitions3 *4 * (C) 2000 Nicolas Pitre <nico@fluxnic.net>5 *6 * This code is GPL7 */8 9#ifndef MTD_PARTITIONS_H10#define MTD_PARTITIONS_H11 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 to19 * 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 * types: some partitions can be containers using specific format to describe24 * embedded subpartitions / volumes. E.g. many home routers use "firmware"25 * partition that contains at least kernel and rootfs. In such case an26 * extra parser is needed that will detect these dynamic partitions and27 * report them to the MTD subsystem. If set this property stores an array28 * of parser names to use when looking for subpartitions.29 * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition30 * will extend to the end of the master MTD device.31 * offset: absolute starting position within the master MTD device; if32 * defined as MTDPART_OFS_APPEND, the partition will start where the33 * previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block;34 * if MTDPART_OFS_RETAIN, consume as much as possible, leaving size35 * after the end of partition.36 * mask_flags: contains flags that have to be masked (removed) from the37 * master MTD flag set for the corresponding MTD partition.38 * For example, to force a read-only partition, simply adding39 * MTD_WRITEABLE to the mask_flags will do the trick.40 * add_flags: contains flags to add to the parent flags41 *42 * Note: writeable partitions require their size and offset be43 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).44 */45 46struct mtd_partition {47 const char *name; /* identifier string */48 const char *const *types; /* names of parsers to use if any */49 uint64_t size; /* partition size */50 uint64_t offset; /* offset within the master MTD space */51 uint32_t mask_flags; /* master MTD flags to mask out for this partition */52 uint32_t add_flags; /* flags to add to the partition */53 struct device_node *of_node;54};55 56#define MTDPART_OFS_RETAIN (-3)57#define MTDPART_OFS_NXTBLK (-2)58#define MTDPART_OFS_APPEND (-1)59#define MTDPART_SIZ_FULL (0)60 61 62struct mtd_info;63struct device_node;64 65/**66 * struct mtd_part_parser_data - used to pass data to MTD partition parsers.67 * @origin: for RedBoot, start address of MTD device68 */69struct mtd_part_parser_data {70 unsigned long origin;71};72 73 74/*75 * Functions dealing with the various ways of partitioning the space76 */77 78struct mtd_part_parser {79 struct list_head list;80 struct module *owner;81 const char *name;82 const struct of_device_id *of_match_table;83 int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,84 struct mtd_part_parser_data *);85 void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);86};87 88/* Container for passing around a set of parsed partitions */89struct mtd_partitions {90 const struct mtd_partition *parts;91 int nr_parts;92 const struct mtd_part_parser *parser;93};94 95extern int __register_mtd_parser(struct mtd_part_parser *parser,96 struct module *owner);97#define register_mtd_parser(parser) __register_mtd_parser(parser, THIS_MODULE)98 99extern void deregister_mtd_parser(struct mtd_part_parser *parser);100 101/*102 * module_mtd_part_parser() - Helper macro for MTD partition parsers that don't103 * do anything special in module init/exit. Each driver may only use this macro104 * once, and calling it replaces module_init() and module_exit().105 */106#define module_mtd_part_parser(__mtd_part_parser) \107 module_driver(__mtd_part_parser, register_mtd_parser, \108 deregister_mtd_parser)109 110int mtd_add_partition(struct mtd_info *master, const char *name,111 long long offset, long long length);112int mtd_del_partition(struct mtd_info *master, int partno);113uint64_t mtd_get_device_size(const struct mtd_info *mtd);114 115#endif116