285 lines
9.4 KiB
C
285 lines
9.4 KiB
C
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/*
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* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef __MTD_ABI_H__
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#define __MTD_ABI_H__
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#include <linux/types.h>
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struct erase_info_user {
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__u32 start;
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__u32 length;
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};
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struct erase_info_user64 {
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__u64 start;
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__u64 length;
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};
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struct mtd_oob_buf {
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__u32 start;
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__u32 length;
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unsigned char __user *ptr;
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};
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struct mtd_oob_buf64 {
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__u64 start;
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__u32 pad;
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__u32 length;
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__u64 usr_ptr;
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};
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/**
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* MTD operation modes
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*
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* @MTD_OPS_PLACE_OOB: OOB data are placed at the given offset (default)
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* @MTD_OPS_AUTO_OOB: OOB data are automatically placed at the free areas
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* which are defined by the internal ecclayout
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* @MTD_OPS_RAW: data are transferred as-is, with no error correction;
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* this mode implies %MTD_OPS_PLACE_OOB
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*
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* These modes can be passed to ioctl(MEMWRITE) and are also used internally.
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* See notes on "MTD file modes" for discussion on %MTD_OPS_RAW vs.
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* %MTD_FILE_MODE_RAW.
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*/
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enum {
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MTD_OPS_PLACE_OOB = 0,
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MTD_OPS_AUTO_OOB = 1,
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MTD_OPS_RAW = 2,
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};
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/**
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* struct mtd_write_req - data structure for requesting a write operation
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*
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* @start: start address
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* @len: length of data buffer
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* @ooblen: length of OOB buffer
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* @usr_data: user-provided data buffer
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* @usr_oob: user-provided OOB buffer
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* @mode: MTD mode (see "MTD operation modes")
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* @padding: reserved, must be set to 0
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*
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* This structure supports ioctl(MEMWRITE) operations, allowing data and/or OOB
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* writes in various modes. To write to OOB-only, set @usr_data == NULL, and to
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* write data-only, set @usr_oob == NULL. However, setting both @usr_data and
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* @usr_oob to NULL is not allowed.
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*/
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struct mtd_write_req {
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__u64 start;
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__u64 len;
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__u64 ooblen;
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__u64 usr_data;
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__u64 usr_oob;
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__u8 mode;
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__u8 padding[7];
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};
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#define MTD_ABSENT 0
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#define MTD_RAM 1
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#define MTD_ROM 2
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#define MTD_NORFLASH 3
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#define MTD_NANDFLASH 4 /* SLC NAND */
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#define MTD_DATAFLASH 6
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#define MTD_UBIVOLUME 7
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#define MTD_MLCNANDFLASH 8 /* MLC NAND (including TLC) */
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#define MTD_WRITEABLE 0x400 /* Device is writeable */
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#define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
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#define MTD_NO_ERASE 0x1000 /* No erase necessary */
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#define MTD_POWERUP_LOCK 0x2000 /* Always locked after reset */
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/* Some common devices / combinations of capabilities */
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#define MTD_CAP_ROM 0
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#define MTD_CAP_RAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
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#define MTD_CAP_NORFLASH (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
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#define MTD_CAP_NANDFLASH (MTD_WRITEABLE)
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#define MTD_CAP_NVRAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
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/* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */
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#define MTD_NANDECC_OFF 0 // Switch off ECC (Not recommended)
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#define MTD_NANDECC_PLACE 1 // Use the given placement in the structure (YAFFS1 legacy mode)
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#define MTD_NANDECC_AUTOPLACE 2 // Use the default placement scheme
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#define MTD_NANDECC_PLACEONLY 3 // Use the given placement in the structure (Do not store ecc result on read)
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#define MTD_NANDECC_AUTOPL_USR 4 // Use the given autoplacement scheme rather than using the default
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/* OTP mode selection */
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#define MTD_OTP_OFF 0
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#define MTD_OTP_FACTORY 1
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#define MTD_OTP_USER 2
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struct mtd_info_user {
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__u8 type;
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__u32 flags;
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__u32 size; /* Total size of the MTD */
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__u32 erasesize;
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__u32 writesize;
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__u32 oobsize; /* Amount of OOB data per block (e.g. 16) */
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__u64 padding; /* Old obsolete field; do not use */
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};
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struct region_info_user {
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__u32 offset; /* At which this region starts,
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* from the beginning of the MTD */
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__u32 erasesize; /* For this region */
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__u32 numblocks; /* Number of blocks in this region */
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__u32 regionindex;
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};
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struct otp_info {
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__u32 start;
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__u32 length;
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__u32 locked;
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};
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/*
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* Note, the following ioctl existed in the past and was removed:
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* #define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo)
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* Try to avoid adding a new ioctl with the same ioctl number.
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*/
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/* Get basic MTD characteristics info (better to use sysfs) */
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#define MEMGETINFO _IOR('M', 1, struct mtd_info_user)
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/* Erase segment of MTD */
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#define MEMERASE _IOW('M', 2, struct erase_info_user)
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/* Write out-of-band data from MTD */
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#define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
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/* Read out-of-band data from MTD */
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#define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)
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/* Lock a chip (for MTD that supports it) */
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#define MEMLOCK _IOW('M', 5, struct erase_info_user)
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/* Unlock a chip (for MTD that supports it) */
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#define MEMUNLOCK _IOW('M', 6, struct erase_info_user)
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/* Get the number of different erase regions */
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#define MEMGETREGIONCOUNT _IOR('M', 7, int)
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/* Get information about the erase region for a specific index */
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#define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user)
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/* Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface */
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#define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo)
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/* Check if an eraseblock is bad */
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#define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t)
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/* Mark an eraseblock as bad */
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#define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t)
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/* Set OTP (One-Time Programmable) mode (factory vs. user) */
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#define OTPSELECT _IOR('M', 13, int)
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/* Get number of OTP (One-Time Programmable) regions */
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#define OTPGETREGIONCOUNT _IOW('M', 14, int)
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/* Get all OTP (One-Time Programmable) info about MTD */
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#define OTPGETREGIONINFO _IOW('M', 15, struct otp_info)
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/* Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
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#define OTPLOCK _IOR('M', 16, struct otp_info)
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/* Get ECC layout (deprecated) */
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#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user)
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/* Get statistics about corrected/uncorrected errors */
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#define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
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/* Set MTD mode on a per-file-descriptor basis (see "MTD file modes") */
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#define MTDFILEMODE _IO('M', 19)
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/* Erase segment of MTD (supports 64-bit address) */
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#define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
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/* Write data to OOB (64-bit version) */
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#define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64)
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/* Read data from OOB (64-bit version) */
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#define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
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/* Check if chip is locked (for MTD that supports it) */
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#define MEMISLOCKED _IOR('M', 23, struct erase_info_user)
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/*
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* Most generic write interface; can write in-band and/or out-of-band in various
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* modes (see "struct mtd_write_req"). This ioctl is not supported for flashes
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* without OOB, e.g., NOR flash.
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*/
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#define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
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/*
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* Obsolete legacy interface. Keep it in order not to break userspace
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* interfaces
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*/
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struct nand_oobinfo {
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__u32 useecc;
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__u32 eccbytes;
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__u32 oobfree[8][2];
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__u32 eccpos[32];
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};
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struct nand_oobfree {
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__u32 offset;
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__u32 length;
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};
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#define MTD_MAX_OOBFREE_ENTRIES 8
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#define MTD_MAX_ECCPOS_ENTRIES 64
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/*
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* OBSOLETE: ECC layout control structure. Exported to user-space via ioctl
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* ECCGETLAYOUT for backwards compatbility and should not be mistaken as a
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* complete set of ECC information. The ioctl truncates the larger internal
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* structure to retain binary compatibility with the static declaration of the
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* ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
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* the user struct, not the MAX size of the internal OOB layout representation.
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*/
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struct nand_ecclayout_user {
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__u32 eccbytes;
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__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
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__u32 oobavail;
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struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
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};
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/**
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* struct mtd_ecc_stats - error correction stats
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*
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* @corrected: number of corrected bits
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* @failed: number of uncorrectable errors
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* @badblocks: number of bad blocks in this partition
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* @bbtblocks: number of blocks reserved for bad block tables
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*/
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struct mtd_ecc_stats {
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__u32 corrected;
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__u32 failed;
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__u32 badblocks;
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__u32 bbtblocks;
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};
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/*
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* MTD file modes - for read/write access to MTD
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*
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* @MTD_FILE_MODE_NORMAL: OTP disabled, ECC enabled
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* @MTD_FILE_MODE_OTP_FACTORY: OTP enabled in factory mode
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* @MTD_FILE_MODE_OTP_USER: OTP enabled in user mode
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* @MTD_FILE_MODE_RAW: OTP disabled, ECC disabled
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*
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* These modes can be set via ioctl(MTDFILEMODE). The mode mode will be retained
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* separately for each open file descriptor.
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*
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* Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW -
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* raw access to the flash, without error correction or autoplacement schemes.
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* Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode
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* (e.g., when using ioctl(MEMWRITE)), but in some cases, the MTD_FILE_MODE is
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* used out of necessity (e.g., `write()', ioctl(MEMWRITEOOB64)).
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*/
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enum mtd_file_modes {
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MTD_FILE_MODE_NORMAL = MTD_OTP_OFF,
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MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
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MTD_FILE_MODE_OTP_USER = MTD_OTP_USER,
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MTD_FILE_MODE_RAW,
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};
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static inline int mtd_type_is_nand_user(const struct mtd_info_user *mtd)
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{
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return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
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}
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#endif /* __MTD_ABI_H__ */
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