463 lines
15 KiB
C
463 lines
15 KiB
C
/*
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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_MTD_H__
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#define __MTD_MTD_H__
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#include <linux/types.h>
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#include <linux/uio.h>
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#include <linux/notifier.h>
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#include <linux/device.h>
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#include <mtd/mtd-abi.h>
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#include <asm/div64.h>
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#define MTD_ERASE_PENDING 0x01
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#define MTD_ERASING 0x02
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#define MTD_ERASE_SUSPEND 0x04
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#define MTD_ERASE_DONE 0x08
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#define MTD_ERASE_FAILED 0x10
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#define MTD_FAIL_ADDR_UNKNOWN -1LL
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/*
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* If the erase fails, fail_addr might indicate exactly which block failed. If
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* fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level
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* or was not specific to any particular block.
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*/
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struct erase_info {
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struct mtd_info *mtd;
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uint64_t addr;
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uint64_t len;
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uint64_t fail_addr;
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u_long time;
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u_long retries;
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unsigned dev;
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unsigned cell;
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void (*callback) (struct erase_info *self);
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u_long priv;
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u_char state;
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struct erase_info *next;
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};
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struct mtd_erase_region_info {
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uint64_t offset; /* At which this region starts, from the beginning of the MTD */
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uint32_t erasesize; /* For this region */
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uint32_t numblocks; /* Number of blocks of erasesize in this region */
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unsigned long *lockmap; /* If keeping bitmap of locks */
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};
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/**
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* struct mtd_oob_ops - oob operation operands
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* @mode: operation mode
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*
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* @len: number of data bytes to write/read
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*
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* @retlen: number of data bytes written/read
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*
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* @ooblen: number of oob bytes to write/read
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* @oobretlen: number of oob bytes written/read
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* @ooboffs: offset of oob data in the oob area (only relevant when
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* mode = MTD_OPS_PLACE_OOB or MTD_OPS_RAW)
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* @datbuf: data buffer - if NULL only oob data are read/written
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* @oobbuf: oob data buffer
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*
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* Note, it is allowed to read more than one OOB area at one go, but not write.
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* The interface assumes that the OOB write requests program only one page's
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* OOB area.
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*/
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struct mtd_oob_ops {
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unsigned int mode;
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size_t len;
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size_t retlen;
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size_t ooblen;
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size_t oobretlen;
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uint32_t ooboffs;
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uint8_t *datbuf;
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uint8_t *oobbuf;
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};
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#define MTD_MAX_OOBFREE_ENTRIES_LARGE 32
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#define MTD_MAX_ECCPOS_ENTRIES_LARGE 640
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/**
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* struct mtd_oob_region - oob region definition
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* @offset: region offset
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* @length: region length
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*
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* This structure describes a region of the OOB area, and is used
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* to retrieve ECC or free bytes sections.
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* Each section is defined by an offset within the OOB area and a
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* length.
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*/
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struct mtd_oob_region {
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u32 offset;
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u32 length;
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};
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/*
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* struct mtd_ooblayout_ops - NAND OOB layout operations
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* @ecc: function returning an ECC region in the OOB area.
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* Should return -ERANGE if %section exceeds the total number of
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* ECC sections.
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* @free: function returning a free region in the OOB area.
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* Should return -ERANGE if %section exceeds the total number of
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* free sections.
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*/
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struct mtd_ooblayout_ops {
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int (*ecc)(struct mtd_info *mtd, int section,
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struct mtd_oob_region *oobecc);
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int (*free)(struct mtd_info *mtd, int section,
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struct mtd_oob_region *oobfree);
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};
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struct module; /* only needed for owner field in mtd_info */
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struct mtd_info {
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u_char type;
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uint32_t flags;
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uint64_t size; // Total size of the MTD
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/* "Major" erase size for the device. Naïve users may take this
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* to be the only erase size available, or may use the more detailed
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* information below if they desire
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*/
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uint32_t erasesize;
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/* Minimal writable flash unit size. In case of NOR flash it is 1 (even
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* though individual bits can be cleared), in case of NAND flash it is
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* one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
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* it is of ECC block size, etc. It is illegal to have writesize = 0.
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* Any driver registering a struct mtd_info must ensure a writesize of
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* 1 or larger.
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*/
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uint32_t writesize;
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/*
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* Size of the write buffer used by the MTD. MTD devices having a write
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* buffer can write multiple writesize chunks at a time. E.g. while
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* writing 4 * writesize bytes to a device with 2 * writesize bytes
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* buffer the MTD driver can (but doesn't have to) do 2 writesize
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* operations, but not 4. Currently, all NANDs have writebufsize
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* equivalent to writesize (NAND page size). Some NOR flashes do have
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* writebufsize greater than writesize.
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*/
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uint32_t writebufsize;
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uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
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uint32_t oobavail; // Available OOB bytes per block
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/*
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* If erasesize is a power of 2 then the shift is stored in
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* erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
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*/
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unsigned int erasesize_shift;
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unsigned int writesize_shift;
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/* Masks based on erasesize_shift and writesize_shift */
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unsigned int erasesize_mask;
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unsigned int writesize_mask;
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/*
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* read ops return -EUCLEAN if max number of bitflips corrected on any
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* one region comprising an ecc step equals or exceeds this value.
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* Settable by driver, else defaults to ecc_strength. User can override
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* in sysfs. N.B. The meaning of the -EUCLEAN return code has changed;
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* see Documentation/ABI/testing/sysfs-class-mtd for more detail.
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*/
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unsigned int bitflip_threshold;
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// Kernel-only stuff starts here.
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const char *name;
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int index;
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/* OOB layout description */
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const struct mtd_ooblayout_ops *ooblayout;
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/* the ecc step size. */
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unsigned int ecc_step_size;
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/* max number of correctible bit errors per ecc step */
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unsigned int ecc_strength;
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/* Data for variable erase regions. If numeraseregions is zero,
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* it means that the whole device has erasesize as given above.
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*/
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int numeraseregions;
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struct mtd_erase_region_info *eraseregions;
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/*
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* Do not call via these pointers, use corresponding mtd_*()
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* wrappers instead.
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*/
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int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
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int (*_point) (struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, void **virt, resource_size_t *phys);
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int (*_unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
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unsigned long (*_get_unmapped_area) (struct mtd_info *mtd,
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unsigned long len,
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unsigned long offset,
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unsigned long flags);
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int (*_read) (struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf);
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int (*_write) (struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf);
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int (*_panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf);
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int (*_read_oob) (struct mtd_info *mtd, loff_t from,
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struct mtd_oob_ops *ops);
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int (*_write_oob) (struct mtd_info *mtd, loff_t to,
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struct mtd_oob_ops *ops);
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int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf);
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int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf);
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int (*_get_user_prot_info) (struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf);
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int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf);
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int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
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size_t len, size_t *retlen, u_char *buf);
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int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
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size_t len);
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int (*_writev) (struct mtd_info *mtd, const struct kvec *vecs,
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unsigned long count, loff_t to, size_t *retlen);
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void (*_sync) (struct mtd_info *mtd);
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int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
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int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
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int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
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int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
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int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
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int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
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int (*_suspend) (struct mtd_info *mtd);
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void (*_resume) (struct mtd_info *mtd);
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void (*_reboot) (struct mtd_info *mtd);
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/*
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* If the driver is something smart, like UBI, it may need to maintain
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* its own reference counting. The below functions are only for driver.
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*/
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int (*_get_device) (struct mtd_info *mtd);
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void (*_put_device) (struct mtd_info *mtd);
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/* Backing device capabilities for this device
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* - provides mmap capabilities
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*/
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struct backing_dev_info *backing_dev_info;
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struct notifier_block reboot_notifier; /* default mode before reboot */
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/* ECC status information */
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struct mtd_ecc_stats ecc_stats;
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/* Subpage shift (NAND) */
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int subpage_sft;
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void *priv;
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struct module *owner;
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struct device dev;
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int usecount;
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};
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int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
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struct mtd_oob_region *oobecc);
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int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
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int *section,
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struct mtd_oob_region *oobregion);
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int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
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const u8 *oobbuf, int start, int nbytes);
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int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
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u8 *oobbuf, int start, int nbytes);
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int mtd_ooblayout_free(struct mtd_info *mtd, int section,
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struct mtd_oob_region *oobfree);
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int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
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const u8 *oobbuf, int start, int nbytes);
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int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
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u8 *oobbuf, int start, int nbytes);
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int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
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int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
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static inline void mtd_set_ooblayout(struct mtd_info *mtd,
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const struct mtd_ooblayout_ops *ooblayout)
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{
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mtd->ooblayout = ooblayout;
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}
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static inline void mtd_set_of_node(struct mtd_info *mtd,
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struct device_node *np)
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{
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mtd->dev.of_node = np;
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}
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static inline struct device_node *mtd_get_of_node(struct mtd_info *mtd)
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{
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return mtd->dev.of_node;
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}
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static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
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{
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return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
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}
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int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
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int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
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void **virt, resource_size_t *phys);
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int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
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unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
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unsigned long offset, unsigned long flags);
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int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
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u_char *buf);
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int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
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const u_char *buf);
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int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
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const u_char *buf);
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int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops);
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int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops);
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int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
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struct otp_info *buf);
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int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf);
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int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
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struct otp_info *buf);
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int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf);
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int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, u_char *buf);
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int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
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int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
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unsigned long count, loff_t to, size_t *retlen);
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static inline void mtd_sync(struct mtd_info *mtd)
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{
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if (mtd->_sync)
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mtd->_sync(mtd);
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}
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int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
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int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
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int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
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int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
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int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
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int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
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static inline int mtd_suspend(struct mtd_info *mtd)
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{
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return mtd->_suspend ? mtd->_suspend(mtd) : 0;
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}
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static inline void mtd_resume(struct mtd_info *mtd)
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{
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if (mtd->_resume)
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mtd->_resume(mtd);
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}
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static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->erasesize_shift)
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return sz >> mtd->erasesize_shift;
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do_div(sz, mtd->erasesize);
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return sz;
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}
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static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->erasesize_shift)
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return sz & mtd->erasesize_mask;
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return do_div(sz, mtd->erasesize);
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}
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static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->writesize_shift)
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return sz >> mtd->writesize_shift;
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do_div(sz, mtd->writesize);
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return sz;
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}
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static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->writesize_shift)
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return sz & mtd->writesize_mask;
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return do_div(sz, mtd->writesize);
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}
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static inline int mtd_has_oob(const struct mtd_info *mtd)
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{
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return mtd->_read_oob && mtd->_write_oob;
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}
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static inline int mtd_type_is_nand(const struct mtd_info *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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static inline int mtd_can_have_bb(const struct mtd_info *mtd)
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{
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return !!mtd->_block_isbad;
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}
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/* Kernel-side ioctl definitions */
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struct mtd_partition;
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struct mtd_part_parser_data;
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extern int mtd_device_parse_register(struct mtd_info *mtd,
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const char * const *part_probe_types,
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struct mtd_part_parser_data *parser_data,
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const struct mtd_partition *defparts,
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int defnr_parts);
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#define mtd_device_register(master, parts, nr_parts) \
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mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
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extern int mtd_device_unregister(struct mtd_info *master);
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extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
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extern int __get_mtd_device(struct mtd_info *mtd);
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extern void __put_mtd_device(struct mtd_info *mtd);
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extern struct mtd_info *get_mtd_device_nm(const char *name);
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extern void put_mtd_device(struct mtd_info *mtd);
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struct mtd_notifier {
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void (*add)(struct mtd_info *mtd);
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void (*remove)(struct mtd_info *mtd);
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struct list_head list;
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};
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extern void register_mtd_user (struct mtd_notifier *new);
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extern int unregister_mtd_user (struct mtd_notifier *old);
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void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
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void mtd_erase_callback(struct erase_info *instr);
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static inline int mtd_is_bitflip(int err) {
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return err == -EUCLEAN;
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}
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static inline int mtd_is_eccerr(int err) {
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return err == -EBADMSG;
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}
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static inline int mtd_is_bitflip_or_eccerr(int err) {
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return mtd_is_bitflip(err) || mtd_is_eccerr(err);
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}
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unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
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#endif /* __MTD_MTD_H__ */
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