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Instead of collecting partitions in a flat list, create a hierarchy within the mtd_info structure: use a partitions list to keep track of the partitions of an MTD device (which might be itself a partition of another MTD device), a pointer to the parent device (NULL when the MTD device is the root one, not a partition). By also saving directly in mtd_info the offset of the partition, we can get rid of the mtd_part structure. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/*
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* MTD partitioning layer definitions
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*
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* (C) 2000 Nicolas Pitre <nico@fluxnic.net>
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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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* 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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*
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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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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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struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */
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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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#ifndef __UBOOT__
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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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* @of_node: for OF parsers, device node containing partitioning information
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*/
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struct mtd_part_parser_data {
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unsigned long origin;
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struct device_node *of_node;
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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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int (*parse_fn)(struct mtd_info *, struct mtd_partition **,
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struct mtd_part_parser_data *);
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};
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extern void register_mtd_parser(struct mtd_part_parser *parser);
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extern void deregister_mtd_parser(struct mtd_part_parser *parser);
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#endif
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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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#if defined(CONFIG_MTD_PARTITIONS)
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int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
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struct mtd_partition **_parts, int *_nparts);
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void mtd_free_parsed_partitions(struct mtd_partition *parts,
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unsigned int nparts);
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#else
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static inline int
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mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
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struct mtd_partition **_parts, int *_nparts)
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{
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*_nparts = 0;
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return 0;
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}
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static inline void
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mtd_free_parsed_partitions(struct mtd_partition *parts, unsigned int nparts)
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{
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return;
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}
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#endif /* defined(MTD_PARTITIONS) */
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#endif
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