/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright © 1999-2010 David Woodhouse et al. * */ #ifndef __MTD_MTD_H__ #define __MTD_MTD_H__ #ifndef __UBOOT__ #include #include #include #include #include #include #else #include #include #include #include #include #if IS_ENABLED(CONFIG_DM) #include #endif #define MAX_MTD_DEVICES 32 #endif #define MTD_ERASE_PENDING 0x01 #define MTD_ERASING 0x02 #define MTD_ERASE_SUSPEND 0x04 #define MTD_ERASE_DONE 0x08 #define MTD_ERASE_FAILED 0x10 #define MTD_FAIL_ADDR_UNKNOWN -1LL /* * If the erase fails, fail_addr might indicate exactly which block failed. If * fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level * or was not specific to any particular block. */ struct erase_info { struct mtd_info *mtd; uint64_t addr; uint64_t len; uint64_t fail_addr; u_long time; u_long retries; unsigned dev; unsigned cell; void (*callback) (struct erase_info *self); u_long priv; u_char state; struct erase_info *next; int scrub; }; struct mtd_erase_region_info { uint64_t offset; /* At which this region starts, from the beginning of the MTD */ uint32_t erasesize; /* For this region */ uint32_t numblocks; /* Number of blocks of erasesize in this region */ unsigned long *lockmap; /* If keeping bitmap of locks */ }; /** * struct mtd_oob_ops - oob operation operands * @mode: operation mode * * @len: number of data bytes to write/read * * @retlen: number of data bytes written/read * * @ooblen: number of oob bytes to write/read * @oobretlen: number of oob bytes written/read * @ooboffs: offset of oob data in the oob area (only relevant when * mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW) * @datbuf: data buffer - if NULL only oob data are read/written * @oobbuf: oob data buffer */ struct mtd_oob_ops { unsigned int mode; size_t len; size_t retlen; size_t ooblen; size_t oobretlen; uint32_t ooboffs; uint8_t *datbuf; uint8_t *oobbuf; }; #ifdef CONFIG_SYS_NAND_MAX_OOBFREE #define MTD_MAX_OOBFREE_ENTRIES_LARGE CONFIG_SYS_NAND_MAX_OOBFREE #else #define MTD_MAX_OOBFREE_ENTRIES_LARGE 32 #endif #ifdef CONFIG_SYS_NAND_MAX_ECCPOS #define MTD_MAX_ECCPOS_ENTRIES_LARGE CONFIG_SYS_NAND_MAX_ECCPOS #else #define MTD_MAX_ECCPOS_ENTRIES_LARGE 680 #endif /** * struct mtd_oob_region - oob region definition * @offset: region offset * @length: region length * * This structure describes a region of the OOB area, and is used * to retrieve ECC or free bytes sections. * Each section is defined by an offset within the OOB area and a * length. */ struct mtd_oob_region { u32 offset; u32 length; }; /* * struct mtd_ooblayout_ops - NAND OOB layout operations * @ecc: function returning an ECC region in the OOB area. * Should return -ERANGE if %section exceeds the total number of * ECC sections. * @free: function returning a free region in the OOB area. * Should return -ERANGE if %section exceeds the total number of * free sections. */ struct mtd_ooblayout_ops { int (*ecc)(struct mtd_info *mtd, int section, struct mtd_oob_region *oobecc); int (*free)(struct mtd_info *mtd, int section, struct mtd_oob_region *oobfree); }; /* * Internal ECC layout control structure. For historical reasons, there is a * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained * for export to user-space via the ECCGETLAYOUT ioctl. * nand_ecclayout should be expandable in the future simply by the above macros. */ struct nand_ecclayout { __u32 eccbytes; __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE]; __u32 oobavail; struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE]; }; struct module; /* only needed for owner field in mtd_info */ struct mtd_info { u_char type; uint32_t flags; uint64_t size; // Total size of the MTD /* "Major" erase size for the device. Naïve users may take this * to be the only erase size available, or may use the more detailed * information below if they desire */ uint32_t erasesize; /* Minimal writable flash unit size. In case of NOR flash it is 1 (even * though individual bits can be cleared), in case of NAND flash it is * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR * it is of ECC block size, etc. It is illegal to have writesize = 0. * Any driver registering a struct mtd_info must ensure a writesize of * 1 or larger. */ uint32_t writesize; /* * Size of the write buffer used by the MTD. MTD devices having a write * buffer can write multiple writesize chunks at a time. E.g. while * writing 4 * writesize bytes to a device with 2 * writesize bytes * buffer the MTD driver can (but doesn't have to) do 2 writesize * operations, but not 4. Currently, all NANDs have writebufsize * equivalent to writesize (NAND page size). Some NOR flashes do have * writebufsize greater than writesize. */ uint32_t writebufsize; uint32_t oobsize; // Amount of OOB data per block (e.g. 16) uint32_t oobavail; // Available OOB bytes per block /* * If erasesize is a power of 2 then the shift is stored in * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize. */ unsigned int erasesize_shift; unsigned int writesize_shift; /* Masks based on erasesize_shift and writesize_shift */ unsigned int erasesize_mask; unsigned int writesize_mask; /* * read ops return -EUCLEAN if max number of bitflips corrected on any * one region comprising an ecc step equals or exceeds this value. * Settable by driver, else defaults to ecc_strength. User can override * in sysfs. N.B. The meaning of the -EUCLEAN return code has changed; * see Documentation/ABI/testing/sysfs-class-mtd for more detail. */ unsigned int bitflip_threshold; // Kernel-only stuff starts here. #ifndef __UBOOT__ const char *name; #else char *name; #endif int index; /* OOB layout description */ const struct mtd_ooblayout_ops *ooblayout; /* ECC layout structure pointer - read only! */ struct nand_ecclayout *ecclayout; /* the ecc step size. */ unsigned int ecc_step_size; /* max number of correctible bit errors per ecc step */ unsigned int ecc_strength; /* Data for variable erase regions. If numeraseregions is zero, * it means that the whole device has erasesize as given above. */ int numeraseregions; struct mtd_erase_region_info *eraseregions; /* * Do not call via these pointers, use corresponding mtd_*() * wrappers instead. */ int (*_erase) (struct mtd_info *mtd, struct erase_info *instr); #ifndef __UBOOT__ int (*_point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, void **virt, resource_size_t *phys); int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len); #endif unsigned long (*_get_unmapped_area) (struct mtd_info *mtd, unsigned long len, unsigned long offset, unsigned long flags); int (*_read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); int (*_read_oob) (struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops); int (*_write_oob) (struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops); int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf); int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf); 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); int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len); #ifndef __UBOOT__ int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); #endif void (*_sync) (struct mtd_info *mtd); int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len); int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len); int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len); int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs); int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs); int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs); #ifndef __UBOOT__ int (*_suspend) (struct mtd_info *mtd); void (*_resume) (struct mtd_info *mtd); void (*_reboot) (struct mtd_info *mtd); #endif /* * If the driver is something smart, like UBI, it may need to maintain * its own reference counting. The below functions are only for driver. */ int (*_get_device) (struct mtd_info *mtd); void (*_put_device) (struct mtd_info *mtd); #ifndef __UBOOT__ /* Backing device capabilities for this device * - provides mmap capabilities */ struct backing_dev_info *backing_dev_info; struct notifier_block reboot_notifier; /* default mode before reboot */ #endif /* ECC status information */ struct mtd_ecc_stats ecc_stats; /* Subpage shift (NAND) */ int subpage_sft; void *priv; struct module *owner; #ifndef __UBOOT__ struct device dev; #else struct udevice *dev; #endif int usecount; /* MTD devices do not have any parent. MTD partitions do. */ struct mtd_info *parent; /* * Offset of the partition relatively to the parent offset. * Is 0 for real MTD devices (ie. not partitions). */ u64 offset; /* * List node used to add an MTD partition to the parent * partition list. */ struct list_head node; /* * List of partitions attached to this MTD device (the parent * MTD device can itself be a partition). */ struct list_head partitions; }; #if IS_ENABLED(CONFIG_DM) static inline void mtd_set_of_node(struct mtd_info *mtd, const struct device_node *np) { mtd->dev->node.np = np; } static inline const struct device_node *mtd_get_of_node(struct mtd_info *mtd) { return mtd->dev->node.np; } #else struct device_node; static inline void mtd_set_of_node(struct mtd_info *mtd, const struct device_node *np) { } static inline const struct device_node *mtd_get_of_node(struct mtd_info *mtd) { return NULL; } #endif 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, int *section, struct mtd_oob_region *oobregion); int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, const u8 *oobbuf, int start, int nbytes); int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, u8 *oobbuf, int start, int nbytes); int mtd_ooblayout_free(struct mtd_info *mtd, int section, struct mtd_oob_region *oobfree); int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, const u8 *oobbuf, int start, int nbytes); int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, u8 *oobbuf, int start, int nbytes); int mtd_ooblayout_count_freebytes(struct mtd_info *mtd); int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd); static inline void mtd_set_ooblayout(struct mtd_info *mtd, const struct mtd_ooblayout_ops *ooblayout) { mtd->ooblayout = ooblayout; } static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops) { return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize; } int mtd_erase(struct mtd_info *mtd, struct erase_info *instr); #ifndef __UBOOT__ int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, void **virt, resource_size_t *phys); int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len); #endif unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, unsigned long offset, unsigned long flags); int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops); int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops); int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf); int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf); 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); int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len); #ifndef __UBOOT__ int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen); #endif static inline void mtd_sync(struct mtd_info *mtd) { if (mtd->_sync) mtd->_sync(mtd); } int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len); int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len); int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs); int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs); int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs); #ifndef __UBOOT__ static inline int mtd_suspend(struct mtd_info *mtd) { return mtd->_suspend ? mtd->_suspend(mtd) : 0; } static inline void mtd_resume(struct mtd_info *mtd) { if (mtd->_resume) mtd->_resume(mtd); } #endif static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd) { if (mtd->erasesize_shift) return sz >> mtd->erasesize_shift; do_div(sz, mtd->erasesize); return sz; } static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd) { if (mtd->erasesize_shift) return sz & mtd->erasesize_mask; return do_div(sz, mtd->erasesize); } static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd) { if (mtd->writesize_shift) return sz >> mtd->writesize_shift; do_div(sz, mtd->writesize); return sz; } static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd) { if (mtd->writesize_shift) return sz & mtd->writesize_mask; return do_div(sz, mtd->writesize); } static inline int mtd_has_oob(const struct mtd_info *mtd) { return mtd->_read_oob && mtd->_write_oob; } static inline int mtd_type_is_nand(const struct mtd_info *mtd) { return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH; } static inline int mtd_can_have_bb(const struct mtd_info *mtd) { return !!mtd->_block_isbad; } /* Kernel-side ioctl definitions */ struct mtd_partition; struct mtd_part_parser_data; extern int mtd_device_parse_register(struct mtd_info *mtd, const char * const *part_probe_types, struct mtd_part_parser_data *parser_data, const struct mtd_partition *defparts, int defnr_parts); #define mtd_device_register(master, parts, nr_parts) \ mtd_device_parse_register(master, NULL, NULL, parts, nr_parts) 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 *get_mtd_device_nm(const char *name); extern void put_mtd_device(struct mtd_info *mtd); #ifndef __UBOOT__ struct mtd_notifier { void (*add)(struct mtd_info *mtd); void (*remove)(struct mtd_info *mtd); struct list_head list; }; extern void register_mtd_user (struct mtd_notifier *new); extern int unregister_mtd_user (struct mtd_notifier *old); #endif void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size); #ifdef CONFIG_MTD_PARTITIONS void mtd_erase_callback(struct erase_info *instr); #else static inline void mtd_erase_callback(struct erase_info *instr) { if (instr->callback) instr->callback(instr); } #endif static inline int mtd_is_bitflip(int err) { return err == -EUCLEAN; } static inline int mtd_is_eccerr(int err) { return err == -EBADMSG; } static inline int mtd_is_bitflip_or_eccerr(int err) { return mtd_is_bitflip(err) || mtd_is_eccerr(err); } unsigned mtd_mmap_capabilities(struct mtd_info *mtd); #ifdef __UBOOT__ /* drivers/mtd/mtdcore.h */ int add_mtd_device(struct mtd_info *mtd); int del_mtd_device(struct mtd_info *mtd); int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int); int del_mtd_partitions(struct mtd_info *); struct mtd_info *__mtd_next_device(int i); #define mtd_for_each_device(mtd) \ for ((mtd) = __mtd_next_device(0); \ (mtd) != NULL; \ (mtd) = __mtd_next_device(mtd->index + 1)) int mtd_arg_off(const char *arg, int *idx, loff_t *off, loff_t *size, loff_t *maxsize, int devtype, uint64_t chipsize); int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off, loff_t *size, loff_t *maxsize, int devtype, uint64_t chipsize); /* drivers/mtd/mtdcore.c */ void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset, const uint64_t length, uint64_t *len_incl_bad, int *truncated); bool mtd_dev_list_updated(void); /* drivers/mtd/mtd_uboot.c */ int mtd_search_alternate_name(const char *mtdname, char *altname, unsigned int max_len); #endif #endif /* __MTD_MTD_H__ */