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mtd-abi.h
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/* 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 *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__ */