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115 lines
3.9 KiB
115 lines
3.9 KiB
/* |
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* MTD partitioning layer definitions |
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* |
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* (C) 2000 Nicolas Pitre <[email protected]> |
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* |
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* This code is GPL |
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*/ |
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#ifndef MTD_PARTITIONS_H |
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#define MTD_PARTITIONS_H |
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#include <linux/types.h> |
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/* |
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* Partition definition structure: |
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* |
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* An array of struct partition is passed along with a MTD object to |
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* mtd_device_register() to create them. |
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* |
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* For each partition, these fields are available: |
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* name: string that will be used to label the partition's MTD device. |
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* types: some partitions can be containers using specific format to describe |
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* embedded subpartitions / volumes. E.g. many home routers use "firmware" |
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* partition that contains at least kernel and rootfs. In such case an |
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* extra parser is needed that will detect these dynamic partitions and |
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* report them to the MTD subsystem. If set this property stores an array |
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* of parser names to use when looking for subpartitions. |
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* size: the partition size; if defined as MTDPART_SIZ_FULL, the partition |
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* will extend to the end of the master MTD device. |
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* offset: absolute starting position within the master MTD device; if |
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* defined as MTDPART_OFS_APPEND, the partition will start where the |
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* previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block; |
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* if MTDPART_OFS_RETAIN, consume as much as possible, leaving size |
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* after the end of partition. |
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* mask_flags: contains flags that have to be masked (removed) from the |
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* master MTD flag set for the corresponding MTD partition. |
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* For example, to force a read-only partition, simply adding |
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* MTD_WRITEABLE to the mask_flags will do the trick. |
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* add_flags: contains flags to add to the parent flags |
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* |
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* Note: writeable partitions require their size and offset be |
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* erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK). |
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*/ |
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struct mtd_partition { |
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const char *name; /* identifier string */ |
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const char *const *types; /* names of parsers to use if any */ |
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uint64_t size; /* partition size */ |
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uint64_t offset; /* offset within the master MTD space */ |
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uint32_t mask_flags; /* master MTD flags to mask out for this partition */ |
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uint32_t add_flags; /* flags to add to the partition */ |
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struct device_node *of_node; |
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}; |
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#define MTDPART_OFS_RETAIN (-3) |
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#define MTDPART_OFS_NXTBLK (-2) |
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#define MTDPART_OFS_APPEND (-1) |
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#define MTDPART_SIZ_FULL (0) |
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struct mtd_info; |
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struct device_node; |
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/** |
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* struct mtd_part_parser_data - used to pass data to MTD partition parsers. |
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* @origin: for RedBoot, start address of MTD device |
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*/ |
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struct mtd_part_parser_data { |
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unsigned long origin; |
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}; |
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/* |
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* Functions dealing with the various ways of partitioning the space |
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*/ |
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struct mtd_part_parser { |
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struct list_head list; |
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struct module *owner; |
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const char *name; |
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const struct of_device_id *of_match_table; |
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int (*parse_fn)(struct mtd_info *, const struct mtd_partition **, |
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struct mtd_part_parser_data *); |
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void (*cleanup)(const struct mtd_partition *pparts, int nr_parts); |
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}; |
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/* Container for passing around a set of parsed partitions */ |
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struct mtd_partitions { |
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const struct mtd_partition *parts; |
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int nr_parts; |
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const struct mtd_part_parser *parser; |
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}; |
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extern int __register_mtd_parser(struct mtd_part_parser *parser, |
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struct module *owner); |
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#define register_mtd_parser(parser) __register_mtd_parser(parser, THIS_MODULE) |
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extern void deregister_mtd_parser(struct mtd_part_parser *parser); |
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/* |
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* module_mtd_part_parser() - Helper macro for MTD partition parsers that don't |
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* do anything special in module init/exit. Each driver may only use this macro |
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* once, and calling it replaces module_init() and module_exit(). |
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*/ |
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#define module_mtd_part_parser(__mtd_part_parser) \ |
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module_driver(__mtd_part_parser, register_mtd_parser, \ |
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deregister_mtd_parser) |
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int mtd_add_partition(struct mtd_info *master, const char *name, |
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long long offset, long long length); |
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int mtd_del_partition(struct mtd_info *master, int partno); |
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uint64_t mtd_get_device_size(const struct mtd_info *mtd); |
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#endif
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