include/uapi/mtd/mtd-abi.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
 /*
  * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
  */

 #ifndef __MTD_ABI_H__
 #define __MTD_ABI_H__

 #include <linux/types.h>

 struct erase_info_user {
 	__u32 start;
 	__u32 length;
 };

 struct erase_info_user64 {
 	__u64 start;
 	__u64 length;
 };

 struct mtd_oob_buf {
 	__u32 start;
 	__u32 length;
 	unsigned char __user *ptr;
 };

 struct mtd_oob_buf64 {
 	__u64 start;
 	__u32 pad;
 	__u32 length;
 	__u64 usr_ptr;
 };

 /**
  * 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;
 };

 #define MTD_ABSENT		0
 #define MTD_RAM			1
 #define MTD_ROM			2
 #define MTD_NORFLASH		3
 #define MTD_NANDFLASH		4	/* SLC NAND */
 #define MTD_DATAFLASH		6
 #define MTD_UBIVOLUME		7
 #define MTD_MLCNANDFLASH	8	/* MLC NAND (including TLC) */

 #define MTD_WRITEABLE		0x400	/* Device is writeable */
 #define MTD_BIT_WRITEABLE	0x800	/* Single bits can be flipped */
 #define MTD_NO_ERASE		0x1000	/* No erase necessary */
 #define MTD_POWERUP_LOCK	0x2000	/* Always locked after reset */
 #define MTD_SLC_ON_MLC_EMULATION 0x4000	/* Emulate SLC behavior on MLC NANDs */

 /* Some common devices / combinations of capabilities */
 #define MTD_CAP_ROM		0
 #define MTD_CAP_RAM		(MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
 #define MTD_CAP_NORFLASH	(MTD_WRITEABLE | MTD_BIT_WRITEABLE)
 #define MTD_CAP_NANDFLASH	(MTD_WRITEABLE)
 #define MTD_CAP_NVRAM		(MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)

 /* 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 */

 /* OTP mode selection */
 #define MTD_OTP_OFF		0
 #define MTD_OTP_FACTORY		1
 #define MTD_OTP_USER		2

 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;
 };

 struct otp_info {
 	__u32 start;
 	__u32 length;
 	__u32 locked;
 };

 /*
  * 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];
 };

 struct nand_oobfree {
 	__u32 offset;
 	__u32 length;
 };

 #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,
 };

 static inline int mtd_type_is_nand_user(const struct mtd_info_user *mtd)
 {
 	return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
 }

 #endif /* __MTD_ABI_H__ */
	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
	/*
	* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*
	*/

	#ifndef __MTD_ABI_H__
	#define __MTD_ABI_H__

	#include <linux/types.h>

	struct erase_info_user {
	__u32 start;
	__u32 length;
	};

	struct erase_info_user64 {
	__u64 start;
	__u64 length;
	};

	struct mtd_oob_buf {
	__u32 start;
	__u32 length;
	unsigned char __user *ptr;
	};

	struct mtd_oob_buf64 {
	__u64 start;
	__u32 pad;
	__u32 length;
	__u64 usr_ptr;
	};

	/**
	* 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;
	};

	#define MTD_ABSENT 0
	#define MTD_RAM 1
	#define MTD_ROM 2
	#define MTD_NORFLASH 3
	#define MTD_NANDFLASH 4 /* SLC NAND */
	#define MTD_DATAFLASH 6
	#define MTD_UBIVOLUME 7
	#define MTD_MLCNANDFLASH 8 /* MLC NAND (including TLC) */

	#define MTD_WRITEABLE 0x400 /* Device is writeable */
	#define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
	#define MTD_NO_ERASE 0x1000 /* No erase necessary */
	#define MTD_POWERUP_LOCK 0x2000 /* Always locked after reset */
	#define MTD_SLC_ON_MLC_EMULATION 0x4000 /* Emulate SLC behavior on MLC NANDs */

	/* Some common devices / combinations of capabilities */
	#define MTD_CAP_ROM 0
	#define MTD_CAP_RAM (MTD_WRITEABLE \| MTD_BIT_WRITEABLE \| MTD_NO_ERASE)
	#define MTD_CAP_NORFLASH (MTD_WRITEABLE \| MTD_BIT_WRITEABLE)
	#define MTD_CAP_NANDFLASH (MTD_WRITEABLE)
	#define MTD_CAP_NVRAM (MTD_WRITEABLE \| MTD_BIT_WRITEABLE \| MTD_NO_ERASE)

	/* 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 */

	/* OTP mode selection */
	#define MTD_OTP_OFF 0
	#define MTD_OTP_FACTORY 1
	#define MTD_OTP_USER 2

	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;
	};

	struct otp_info {
	__u32 start;
	__u32 length;
	__u32 locked;
	};

	/*
	* 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];
	};

	struct nand_oobfree {
	__u32 offset;
	__u32 length;
	};

	#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,
	};

	static inline int mtd_type_is_nand_user(const struct mtd_info_user *mtd)
	{
	return mtd->type == MTD_NANDFLASH \|\| mtd->type == MTD_MLCNANDFLASH;
	}

	#endif /* __MTD_ABI_H__ */