diff options
Diffstat (limited to 'include/linux/mtd/mtd.h')
| -rw-r--r-- | include/linux/mtd/mtd.h | 159 |
1 files changed, 142 insertions, 17 deletions
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 249e8d9bfbcd..7c58c44662b8 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -8,6 +8,7 @@ #include <linux/types.h> #include <linux/uio.h> +#include <linux/list.h> #include <linux/notifier.h> #include <linux/device.h> #include <linux/of.h> @@ -39,6 +40,12 @@ struct mtd_erase_region_info { unsigned long *lockmap; /* If keeping bitmap of locks */ }; +struct mtd_req_stats { + unsigned int uncorrectable_errors; + unsigned int corrected_bitflips; + unsigned int max_bitflips; +}; + /** * struct mtd_oob_ops - oob operation operands * @mode: operation mode @@ -69,10 +76,9 @@ struct mtd_oob_ops { uint32_t ooboffs; uint8_t *datbuf; uint8_t *oobbuf; + struct mtd_req_stats *stats; }; -#define MTD_MAX_OOBFREE_ENTRIES_LARGE 32 -#define MTD_MAX_ECCPOS_ENTRIES_LARGE 640 /** * struct mtd_oob_region - oob region definition * @offset: region offset @@ -189,15 +195,49 @@ struct module; /* only needed for owner field in mtd_info */ */ struct mtd_debug_info { struct dentry *dfs_dir; +}; + +/** + * struct mtd_part - MTD partition specific fields + * + * @node: list node used to add an MTD partition to the parent partition list + * @offset: offset of the partition relatively to the parent offset + * @size: partition size. Should be equal to mtd->size unless + * MTD_SLC_ON_MLC_EMULATION is set + * @flags: original flags (before the mtdpart logic decided to tweak them based + * on flash constraints, like eraseblock/pagesize alignment) + * + * This struct is embedded in mtd_info and contains partition-specific + * properties/fields. + */ +struct mtd_part { + struct list_head node; + u64 offset; + u64 size; + u32 flags; +}; - const char *partname; - const char *partid; +/** + * struct mtd_master - MTD master specific fields + * + * @partitions_lock: lock protecting accesses to the partition list. Protects + * not only the master partition list, but also all + * sub-partitions. + * @suspended: et to 1 when the device is suspended, 0 otherwise + * + * This struct is embedded in mtd_info and contains master-specific + * properties/fields. The master is the root MTD device from the MTD partition + * point of view. + */ +struct mtd_master { + struct mutex partitions_lock; + struct mutex chrdev_lock; + unsigned int suspended : 1; }; struct mtd_info { u_char type; uint32_t flags; - uint32_t orig_flags; /* Flags as before running mtd checks */ uint64_t size; // Total size of the MTD /* "Major" erase size for the device. Naïve users may take this @@ -296,9 +336,12 @@ struct mtd_info { int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to, - size_t len, size_t *retlen, u_char *buf); + size_t len, size_t *retlen, + const u_char *buf); int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len); + int (*_erase_user_prot_reg) (struct mtd_info *mtd, loff_t from, + size_t len); int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); void (*_sync) (struct mtd_info *mtd); @@ -339,8 +382,52 @@ struct mtd_info { int usecount; struct mtd_debug_info dbg; struct nvmem_device *nvmem; + struct nvmem_device *otp_user_nvmem; + struct nvmem_device *otp_factory_nvmem; + + /* + * Parent device from the MTD partition point of view. + * + * MTD masters do not have any parent, MTD partitions do. The parent + * MTD device can itself be a partition. + */ + struct mtd_info *parent; + + /* List of partitions attached to this MTD device */ + struct list_head partitions; + + struct mtd_part part; + struct mtd_master master; }; +static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd) +{ + while (mtd->parent) + mtd = mtd->parent; + + return mtd; +} + +static inline u64 mtd_get_master_ofs(struct mtd_info *mtd, u64 ofs) +{ + while (mtd->parent) { + ofs += mtd->part.offset; + mtd = mtd->parent; + } + + return ofs; +} + +static inline bool mtd_is_partition(const struct mtd_info *mtd) +{ + return mtd->parent; +} + +static inline bool mtd_has_partitions(const struct mtd_info *mtd) +{ + return !list_empty(&mtd->partitions); +} + int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, struct mtd_oob_region *oobecc); int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, @@ -392,13 +479,16 @@ static inline u32 mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops) static inline int mtd_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len) { - if (!mtd->_max_bad_blocks) + struct mtd_info *master = mtd_get_master(mtd); + + if (!master->_max_bad_blocks) return -ENOTSUPP; if (mtd->size < (len + ofs) || ofs < 0) return -EINVAL; - return mtd->_max_bad_blocks(mtd, ofs, len); + return master->_max_bad_blocks(master, mtd_get_master_ofs(mtd, ofs), + len); } int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit, @@ -431,16 +521,19 @@ int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, - size_t *retlen, u_char *buf); + size_t *retlen, const u_char *buf); int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len); +int mtd_erase_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len); int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); static inline void mtd_sync(struct mtd_info *mtd) { - if (mtd->_sync) - mtd->_sync(mtd); + struct mtd_info *master = mtd_get_master(mtd); + + if (master->_sync) + master->_sync(master); } int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); @@ -452,13 +545,31 @@ int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs); static inline int mtd_suspend(struct mtd_info *mtd) { - return mtd->_suspend ? mtd->_suspend(mtd) : 0; + struct mtd_info *master = mtd_get_master(mtd); + int ret; + + if (master->master.suspended) + return 0; + + ret = master->_suspend ? master->_suspend(master) : 0; + if (ret) + return ret; + + master->master.suspended = 1; + return 0; } static inline void mtd_resume(struct mtd_info *mtd) { - if (mtd->_resume) - mtd->_resume(mtd); + struct mtd_info *master = mtd_get_master(mtd); + + if (!master->master.suspended) + return; + + if (master->_resume) + master->_resume(master); + + master->master.suspended = 0; } static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd) @@ -521,7 +632,9 @@ static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd) static inline int mtd_wunit_per_eb(struct mtd_info *mtd) { - return mtd->erasesize / mtd->writesize; + struct mtd_info *master = mtd_get_master(mtd); + + return master->erasesize / mtd->writesize; } static inline int mtd_offset_to_wunit(struct mtd_info *mtd, loff_t offs) @@ -538,7 +651,9 @@ static inline loff_t mtd_wunit_to_offset(struct mtd_info *mtd, loff_t base, static inline int mtd_has_oob(const struct mtd_info *mtd) { - return mtd->_read_oob && mtd->_write_oob; + struct mtd_info *master = mtd_get_master((struct mtd_info *)mtd); + + return master->_read_oob && master->_write_oob; } static inline int mtd_type_is_nand(const struct mtd_info *mtd) @@ -548,7 +663,9 @@ static inline int mtd_type_is_nand(const struct mtd_info *mtd) static inline int mtd_can_have_bb(const struct mtd_info *mtd) { - return !!mtd->_block_isbad; + struct mtd_info *master = mtd_get_master((struct mtd_info *)mtd); + + return !!master->_block_isbad; } /* Kernel-side ioctl definitions */ @@ -567,6 +684,7 @@ extern int mtd_device_unregister(struct mtd_info *master); extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); extern int __get_mtd_device(struct mtd_info *mtd); extern void __put_mtd_device(struct mtd_info *mtd); +extern struct mtd_info *of_get_mtd_device_by_node(struct device_node *np); extern struct mtd_info *get_mtd_device_nm(const char *name); extern void put_mtd_device(struct mtd_info *mtd); @@ -596,4 +714,11 @@ static inline int mtd_is_bitflip_or_eccerr(int err) { unsigned mtd_mmap_capabilities(struct mtd_info *mtd); +#ifdef CONFIG_DEBUG_FS +bool mtd_check_expert_analysis_mode(void); +#else +static inline bool mtd_check_expert_analysis_mode(void) { return false; } +#endif + + #endif /* __MTD_MTD_H__ */ |