/** * MTD operation modes * * @MTD_OPS_PLACE_OOB: OOB data are placed at the given offset (default) * @MTD_OPS_AUTO_OOB: OOB data are automatically placed at the free areas * which are defined by the internal ecclayout * @MTD_OPS_RAW: data are transferred as-is, with no error correction; * this mode implies %MTD_OPS_PLACE_OOB * * These modes can be passed to ioctl(MEMWRITE) and ioctl(MEMREAD); they are * also used internally. See notes on "MTD file modes" for discussion on * %MTD_OPS_RAW vs. %MTD_FILE_MODE_RAW.
*/ enum {
MTD_OPS_PLACE_OOB = 0,
MTD_OPS_AUTO_OOB = 1,
MTD_OPS_RAW = 2,
};
/** * struct mtd_write_req - data structure for requesting a write operation * * @start: start address * @len: length of data buffer (only lower 32 bits are used) * @ooblen: length of OOB buffer (only lower 32 bits are used) * @usr_data: user-provided data buffer * @usr_oob: user-provided OOB buffer * @mode: MTD mode (see "MTD operation modes") * @padding: reserved, must be set to 0 * * This structure supports ioctl(MEMWRITE) operations, allowing data and/or OOB * writes in various modes. To write to OOB-only, set @usr_data == NULL, and to * write data-only, set @usr_oob == NULL. However, setting both @usr_data and * @usr_oob to NULL is not allowed.
*/ struct mtd_write_req {
__u64 start;
__u64 len;
__u64 ooblen;
__u64 usr_data;
__u64 usr_oob;
__u8 mode;
__u8 padding[7];
};
/** * struct mtd_read_req_ecc_stats - ECC statistics for a read operation * * @uncorrectable_errors: the number of uncorrectable errors that happened * during the read operation * @corrected_bitflips: the number of bitflips corrected during the read * operation * @max_bitflips: the maximum number of bitflips detected in any single ECC * step for the data read during the operation; this information * can be used to decide whether the data stored in a specific * region of the MTD device should be moved somewhere else to * avoid data loss.
*/ struct mtd_read_req_ecc_stats {
__u32 uncorrectable_errors;
__u32 corrected_bitflips;
__u32 max_bitflips;
};
/** * struct mtd_read_req - data structure for requesting a read operation * * @start: start address * @len: length of data buffer (only lower 32 bits are used) * @ooblen: length of OOB buffer (only lower 32 bits are used) * @usr_data: user-provided data buffer * @usr_oob: user-provided OOB buffer * @mode: MTD mode (see "MTD operation modes") * @padding: reserved, must be set to 0 * @ecc_stats: ECC statistics for the read operation * * This structure supports ioctl(MEMREAD) operations, allowing data and/or OOB * reads in various modes. To read from OOB-only, set @usr_data == NULL, and to * read data-only, set @usr_oob == NULL. However, setting both @usr_data and * @usr_oob to NULL is not allowed.
*/ struct mtd_read_req {
__u64 start;
__u64 len;
__u64 ooblen;
__u64 usr_data;
__u64 usr_oob;
__u8 mode;
__u8 padding[7]; struct mtd_read_req_ecc_stats ecc_stats;
};
/* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */ #define MTD_NANDECC_OFF 0 /* Switch off ECC (Not recommended) */ #define MTD_NANDECC_PLACE 1 /* Use the given placement in the structure (YAFFS1 legacy mode) */ #define MTD_NANDECC_AUTOPLACE 2 /* Use the default placement scheme */ #define MTD_NANDECC_PLACEONLY 3 /* Use the given placement in the structure (Do not store ecc result on read) */ #define MTD_NANDECC_AUTOPL_USR 4 /* Use the given autoplacement scheme rather than using the default */
struct mtd_info_user {
__u8 type;
__u32 flags;
__u32 size; /* Total size of the MTD */
__u32 erasesize;
__u32 writesize;
__u32 oobsize; /* Amount of OOB data per block (e.g. 16) */
__u64 padding; /* Old obsolete field; do not use */
};
struct region_info_user {
__u32 offset; /* At which this region starts,
* from the beginning of the MTD */
__u32 erasesize; /* For this region */
__u32 numblocks; /* Number of blocks in this region */
__u32 regionindex;
};
/* * Note, the following ioctl existed in the past and was removed: * #define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo) * Try to avoid adding a new ioctl with the same ioctl number.
*/
/* Get basic MTD characteristics info (better to use sysfs) */ #define MEMGETINFO _IOR('M', 1, struct mtd_info_user) /* Erase segment of MTD */ #define MEMERASE _IOW('M', 2, struct erase_info_user) /* Write out-of-band data from MTD */ #define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf) /* Read out-of-band data from MTD */ #define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf) /* Lock a chip (for MTD that supports it) */ #define MEMLOCK _IOW('M', 5, struct erase_info_user) /* Unlock a chip (for MTD that supports it) */ #define MEMUNLOCK _IOW('M', 6, struct erase_info_user) /* Get the number of different erase regions */ #define MEMGETREGIONCOUNT _IOR('M', 7, int) /* Get information about the erase region for a specific index */ #define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user) /* Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface */ #define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo) /* Check if an eraseblock is bad */ #define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t) /* Mark an eraseblock as bad */ #define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t) /* Set OTP (One-Time Programmable) mode (factory vs. user) */ #define OTPSELECT _IOR('M', 13, int) /* Get number of OTP (One-Time Programmable) regions */ #define OTPGETREGIONCOUNT _IOW('M', 14, int) /* Get all OTP (One-Time Programmable) info about MTD */ #define OTPGETREGIONINFO _IOW('M', 15, struct otp_info) /* Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */ #define OTPLOCK _IOR('M', 16, struct otp_info) /* Get ECC layout (deprecated) */ #define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user) /* Get statistics about corrected/uncorrected errors */ #define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats) /* Set MTD mode on a per-file-descriptor basis (see "MTD file modes") */ #define MTDFILEMODE _IO('M', 19) /* Erase segment of MTD (supports 64-bit address) */ #define MEMERASE64 _IOW('M', 20, struct erase_info_user64) /* Write data to OOB (64-bit version) */ #define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64) /* Read data from OOB (64-bit version) */ #define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64) /* Check if chip is locked (for MTD that supports it) */ #define MEMISLOCKED _IOR('M', 23, struct erase_info_user) /* * Most generic write interface; can write in-band and/or out-of-band in various * modes (see "struct mtd_write_req"). This ioctl is not supported for flashes * without OOB, e.g., NOR flash.
*/ #define MEMWRITE _IOWR('M', 24, struct mtd_write_req) /* Erase a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */ #define OTPERASE _IOW('M', 25, struct otp_info) /* * Most generic read interface; can read in-band and/or out-of-band in various * modes (see "struct mtd_read_req"). This ioctl is not supported for flashes * without OOB, e.g., NOR flash.
*/ #define MEMREAD _IOWR('M', 26, struct mtd_read_req)
/* * Obsolete legacy interface. Keep it in order not to break userspace * interfaces
*/ struct nand_oobinfo {
__u32 useecc;
__u32 eccbytes;
__u32 oobfree[8][2];
__u32 eccpos[32];
};
#define MTD_MAX_OOBFREE_ENTRIES 8 #define MTD_MAX_ECCPOS_ENTRIES 64 /* * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a * complete set of ECC information. The ioctl truncates the larger internal * structure to retain binary compatibility with the static declaration of the * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of * the user struct, not the MAX size of the internal OOB layout representation.
*/ struct nand_ecclayout_user {
__u32 eccbytes;
__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
__u32 oobavail; struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
};
/** * struct mtd_ecc_stats - error correction stats * * @corrected: number of corrected bits * @failed: number of uncorrectable errors * @badblocks: number of bad blocks in this partition * @bbtblocks: number of blocks reserved for bad block tables
*/ struct mtd_ecc_stats {
__u32 corrected;
__u32 failed;
__u32 badblocks;
__u32 bbtblocks;
};
/* * MTD file modes - for read/write access to MTD * * @MTD_FILE_MODE_NORMAL: OTP disabled, ECC enabled * @MTD_FILE_MODE_OTP_FACTORY: OTP enabled in factory mode * @MTD_FILE_MODE_OTP_USER: OTP enabled in user mode * @MTD_FILE_MODE_RAW: OTP disabled, ECC disabled * * These modes can be set via ioctl(MTDFILEMODE). The mode will be retained * separately for each open file descriptor. * * Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW - * raw access to the flash, without error correction or autoplacement schemes. * Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode * (e.g., when using ioctl(MEMWRITE) or ioctl(MEMREAD)), but in some cases, the * MTD_FILE_MODE is used out of necessity (e.g., `write()', * ioctl(MEMWRITEOOB64)).
*/ enum mtd_file_modes {
MTD_FILE_MODE_NORMAL = MTD_OTP_OFF,
MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
MTD_FILE_MODE_OTP_USER = MTD_OTP_USER,
MTD_FILE_MODE_RAW,
};
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