600 lines
19 KiB
C
600 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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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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#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 <linux/of.h>
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#include <linux/nvmem-provider.h>
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#include <mtd/mtd-abi.h>
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#include <asm/div64.h>
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#define MTD_FAIL_ADDR_UNKNOWN -1LL
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struct mtd_info;
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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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uint64_t addr;
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uint64_t len;
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uint64_t fail_addr;
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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, some MTD drivers do not allow you to write more than one OOB area at
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* one go. If you try to do that on such an MTD device, -EINVAL will be
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* returned. If you want to make your implementation portable on all kind of MTD
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* devices you should split the write request into several sub-requests when the
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* request crosses a page boundary.
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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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/**
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* struct mtd_pairing_info - page pairing information
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*
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* @pair: pair id
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* @group: group id
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*
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* The term "pair" is used here, even though TLC NANDs might group pages by 3
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* (3 bits in a single cell). A pair should regroup all pages that are sharing
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* the same cell. Pairs are then indexed in ascending order.
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*
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* @group is defining the position of a page in a given pair. It can also be
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* seen as the bit position in the cell: page attached to bit 0 belongs to
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* group 0, page attached to bit 1 belongs to group 1, etc.
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*
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* Example:
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* The H27UCG8T2BTR-BC datasheet describes the following pairing scheme:
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*
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* group-0 group-1
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*
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* pair-0 page-0 page-4
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* pair-1 page-1 page-5
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* pair-2 page-2 page-8
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* ...
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* pair-127 page-251 page-255
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*
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*
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* Note that the "group" and "pair" terms were extracted from Samsung and
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* Hynix datasheets, and might be referenced under other names in other
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* datasheets (Micron is describing this concept as "shared pages").
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*/
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struct mtd_pairing_info {
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int pair;
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int group;
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};
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/**
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* struct mtd_pairing_scheme - page pairing scheme description
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*
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* @ngroups: number of groups. Should be related to the number of bits
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* per cell.
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* @get_info: converts a write-unit (page number within an erase block) into
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* mtd_pairing information (pair + group). This function should
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* fill the info parameter based on the wunit index or return
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* -EINVAL if the wunit parameter is invalid.
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* @get_wunit: converts pairing information into a write-unit (page) number.
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* This function should return the wunit index pointed by the
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* pairing information described in the info argument. It should
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* return -EINVAL, if there's no wunit corresponding to the
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* passed pairing information.
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*
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* See mtd_pairing_info documentation for a detailed explanation of the
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* pair and group concepts.
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*
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* The mtd_pairing_scheme structure provides a generic solution to represent
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* NAND page pairing scheme. Instead of exposing two big tables to do the
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* write-unit <-> (pair + group) conversions, we ask the MTD drivers to
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* implement the ->get_info() and ->get_wunit() functions.
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*
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* MTD users will then be able to query these information by using the
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* mtd_pairing_info_to_wunit() and mtd_wunit_to_pairing_info() helpers.
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*
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* @ngroups is here to help MTD users iterating over all the pages in a
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* given pair. This value can be retrieved by MTD users using the
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* mtd_pairing_groups() helper.
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*
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* Examples are given in the mtd_pairing_info_to_wunit() and
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* mtd_wunit_to_pairing_info() documentation.
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*/
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struct mtd_pairing_scheme {
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int ngroups;
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int (*get_info)(struct mtd_info *mtd, int wunit,
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struct mtd_pairing_info *info);
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int (*get_wunit)(struct mtd_info *mtd,
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const struct mtd_pairing_info *info);
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};
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struct module; /* only needed for owner field in mtd_info */
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/**
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* struct mtd_debug_info - debugging information for an MTD device.
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*
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* @dfs_dir: direntry object of the MTD device debugfs directory
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*/
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struct mtd_debug_info {
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struct dentry *dfs_dir;
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const char *partname;
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const char *partid;
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};
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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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uint32_t orig_flags; /* Flags as before running mtd checks */
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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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/* NAND pairing scheme, only provided for MLC/TLC NANDs */
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const struct mtd_pairing_scheme *pairing;
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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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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 (*_max_bad_blocks) (struct mtd_info *mtd, loff_t ofs, size_t len);
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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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/*
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* flag indicates a panic write, low level drivers can take appropriate
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* action if required to ensure writes go through
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*/
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bool oops_panic_write;
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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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struct mtd_debug_info dbg;
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struct nvmem_device *nvmem;
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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_pairing_scheme(struct mtd_info *mtd,
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const struct mtd_pairing_scheme *pairing)
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{
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mtd->pairing = pairing;
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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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if (!mtd->name)
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of_property_read_string(np, "label", &mtd->name);
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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 dev_of_node(&mtd->dev);
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}
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static inline u32 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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static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
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loff_t ofs, size_t len)
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{
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if (!mtd->_max_bad_blocks)
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return -ENOTSUPP;
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if (mtd->size < (len + ofs) || ofs < 0)
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return -EINVAL;
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return mtd->_max_bad_blocks(mtd, ofs, len);
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}
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int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
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struct mtd_pairing_info *info);
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int mtd_pairing_info_to_wunit(struct mtd_info *mtd,
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const struct mtd_pairing_info *info);
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int mtd_pairing_groups(struct mtd_info *mtd);
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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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|
|
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int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
|
|
unsigned long count, loff_t to, size_t *retlen);
|
|
|
|
static inline void mtd_sync(struct mtd_info *mtd)
|
|
{
|
|
if (mtd->_sync)
|
|
mtd->_sync(mtd);
|
|
}
|
|
|
|
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
|
|
int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
|
|
int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
|
|
int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs);
|
|
int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
|
|
int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
|
|
|
|
static inline int mtd_suspend(struct mtd_info *mtd)
|
|
{
|
|
return mtd->_suspend ? mtd->_suspend(mtd) : 0;
|
|
}
|
|
|
|
static inline void mtd_resume(struct mtd_info *mtd)
|
|
{
|
|
if (mtd->_resume)
|
|
mtd->_resume(mtd);
|
|
}
|
|
|
|
static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
|
|
{
|
|
if (mtd->erasesize_shift)
|
|
return sz >> mtd->erasesize_shift;
|
|
do_div(sz, mtd->erasesize);
|
|
return sz;
|
|
}
|
|
|
|
static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
|
|
{
|
|
if (mtd->erasesize_shift)
|
|
return sz & mtd->erasesize_mask;
|
|
return do_div(sz, mtd->erasesize);
|
|
}
|
|
|
|
/**
|
|
* mtd_align_erase_req - Adjust an erase request to align things on eraseblock
|
|
* boundaries.
|
|
* @mtd: the MTD device this erase request applies on
|
|
* @req: the erase request to adjust
|
|
*
|
|
* This function will adjust @req->addr and @req->len to align them on
|
|
* @mtd->erasesize. Of course we expect @mtd->erasesize to be != 0.
|
|
*/
|
|
static inline void mtd_align_erase_req(struct mtd_info *mtd,
|
|
struct erase_info *req)
|
|
{
|
|
u32 mod;
|
|
|
|
if (WARN_ON(!mtd->erasesize))
|
|
return;
|
|
|
|
mod = mtd_mod_by_eb(req->addr, mtd);
|
|
if (mod) {
|
|
req->addr -= mod;
|
|
req->len += mod;
|
|
}
|
|
|
|
mod = mtd_mod_by_eb(req->addr + req->len, mtd);
|
|
if (mod)
|
|
req->len += mtd->erasesize - mod;
|
|
}
|
|
|
|
static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
|
|
{
|
|
if (mtd->writesize_shift)
|
|
return sz >> mtd->writesize_shift;
|
|
do_div(sz, mtd->writesize);
|
|
return sz;
|
|
}
|
|
|
|
static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
|
|
{
|
|
if (mtd->writesize_shift)
|
|
return sz & mtd->writesize_mask;
|
|
return do_div(sz, mtd->writesize);
|
|
}
|
|
|
|
static inline int mtd_wunit_per_eb(struct mtd_info *mtd)
|
|
{
|
|
return mtd->erasesize / mtd->writesize;
|
|
}
|
|
|
|
static inline int mtd_offset_to_wunit(struct mtd_info *mtd, loff_t offs)
|
|
{
|
|
return mtd_div_by_ws(mtd_mod_by_eb(offs, mtd), mtd);
|
|
}
|
|
|
|
static inline loff_t mtd_wunit_to_offset(struct mtd_info *mtd, loff_t base,
|
|
int wunit)
|
|
{
|
|
return base + (wunit * mtd->writesize);
|
|
}
|
|
|
|
|
|
static inline int mtd_has_oob(const struct mtd_info *mtd)
|
|
{
|
|
return mtd->_read_oob && mtd->_write_oob;
|
|
}
|
|
|
|
static inline int mtd_type_is_nand(const struct mtd_info *mtd)
|
|
{
|
|
return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
|
|
}
|
|
|
|
static inline int mtd_can_have_bb(const struct mtd_info *mtd)
|
|
{
|
|
return !!mtd->_block_isbad;
|
|
}
|
|
|
|
/* Kernel-side ioctl definitions */
|
|
|
|
struct mtd_partition;
|
|
struct mtd_part_parser_data;
|
|
|
|
extern int mtd_device_parse_register(struct mtd_info *mtd,
|
|
const char * const *part_probe_types,
|
|
struct mtd_part_parser_data *parser_data,
|
|
const struct mtd_partition *defparts,
|
|
int defnr_parts);
|
|
#define mtd_device_register(master, parts, nr_parts) \
|
|
mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
|
|
extern int mtd_device_unregister(struct mtd_info *master);
|
|
extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
|
|
extern int __get_mtd_device(struct mtd_info *mtd);
|
|
extern void __put_mtd_device(struct mtd_info *mtd);
|
|
extern struct mtd_info *get_mtd_device_nm(const char *name);
|
|
extern void put_mtd_device(struct mtd_info *mtd);
|
|
|
|
|
|
struct mtd_notifier {
|
|
void (*add)(struct mtd_info *mtd);
|
|
void (*remove)(struct mtd_info *mtd);
|
|
struct list_head list;
|
|
};
|
|
|
|
|
|
extern void register_mtd_user (struct mtd_notifier *new);
|
|
extern int unregister_mtd_user (struct mtd_notifier *old);
|
|
void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
|
|
|
|
static inline int mtd_is_bitflip(int err) {
|
|
return err == -EUCLEAN;
|
|
}
|
|
|
|
static inline int mtd_is_eccerr(int err) {
|
|
return err == -EBADMSG;
|
|
}
|
|
|
|
static inline int mtd_is_bitflip_or_eccerr(int err) {
|
|
return mtd_is_bitflip(err) || mtd_is_eccerr(err);
|
|
}
|
|
|
|
unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
|
|
|
|
#endif /* __MTD_MTD_H__ */
|