9cf075f865
Make sure that the retlen is set to 0 in case of error. This harmonizes drivers - some set it to 0 in some error cases and do not write anything in other error cases. Now we can do this consistently for all drivers. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
513 lines
15 KiB
C
513 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_CHAR_MAJOR 90
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#define MTD_BLOCK_MAJOR 31
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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 448
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/*
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* Internal ECC layout control structure. For historical reasons, there is a
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* similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
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* for export to user-space via the ECCGETLAYOUT ioctl.
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* nand_ecclayout should be expandable in the future simply by the above macros.
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*/
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struct nand_ecclayout {
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__u32 eccbytes;
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__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
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__u32 oobavail;
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struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
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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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// Kernel-only stuff starts here.
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const char *name;
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int index;
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/* ECC layout structure pointer - read only! */
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struct nand_ecclayout *ecclayout;
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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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void (*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, struct otp_info *buf,
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size_t len);
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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, struct otp_info *buf,
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size_t len);
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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, size_t len,
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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_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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/*
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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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/*
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* Erase is an asynchronous operation. Device drivers are supposed
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* to call instr->callback() whenever the operation completes, even
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* if it completes with a failure.
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* Callers are supposed to pass a callback function and wait for it
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* to be called before writing to the block.
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*/
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static inline int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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return mtd->erase(mtd, instr);
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}
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/*
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* This stuff for eXecute-In-Place. phys is optional and may be set to NULL.
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*/
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static inline int mtd_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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{
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*retlen = 0;
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return mtd->point(mtd, from, len, retlen, virt, phys);
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}
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/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
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static inline void mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
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{
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return mtd->unpoint(mtd, from, len);
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}
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/*
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* Allow NOMMU mmap() to directly map the device (if not NULL)
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* - return the address to which the offset maps
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* - return -ENOSYS to indicate refusal to do the mapping
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*/
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static inline unsigned long mtd_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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{
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return mtd->get_unmapped_area(mtd, len, offset, flags);
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}
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static inline int mtd_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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{
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return mtd->read(mtd, from, len, retlen, buf);
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}
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static inline int mtd_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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{
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*retlen = 0;
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return mtd->write(mtd, to, len, retlen, buf);
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}
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/*
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* In blackbox flight recorder like scenarios we want to make successful writes
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* in interrupt context. panic_write() is only intended to be called when its
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* known the kernel is about to panic and we need the write to succeed. Since
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* the kernel is not going to be running for much longer, this function can
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* break locks and delay to ensure the write succeeds (but not sleep).
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*/
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static inline int mtd_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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{
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*retlen = 0;
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return mtd->panic_write(mtd, to, len, retlen, buf);
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}
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static inline int mtd_read_oob(struct mtd_info *mtd, loff_t from,
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struct mtd_oob_ops *ops)
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{
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ops->retlen = ops->oobretlen = 0;
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return mtd->read_oob(mtd, from, ops);
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}
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static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to,
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struct mtd_oob_ops *ops)
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{
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ops->retlen = ops->oobretlen = 0;
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return mtd->write_oob(mtd, to, ops);
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}
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/*
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* Method to access the protection register area, present in some flash
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* devices. The user data is one time programmable but the factory data is read
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* only.
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*/
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static inline int mtd_get_fact_prot_info(struct mtd_info *mtd,
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struct otp_info *buf, size_t len)
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{
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return mtd->get_fact_prot_info(mtd, buf, len);
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}
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static inline int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen,
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u_char *buf)
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{
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*retlen = 0;
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return mtd->read_fact_prot_reg(mtd, from, len, retlen, buf);
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}
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static inline int mtd_get_user_prot_info(struct mtd_info *mtd,
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struct otp_info *buf,
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size_t len)
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{
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return mtd->get_user_prot_info(mtd, buf, len);
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}
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static inline int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen,
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u_char *buf)
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{
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*retlen = 0;
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return mtd->read_user_prot_reg(mtd, from, len, retlen, buf);
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}
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static inline int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to,
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size_t len, size_t *retlen,
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u_char *buf)
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{
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*retlen = 0;
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return mtd->write_user_prot_reg(mtd, to, len, retlen, buf);
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}
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static inline int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len)
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{
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return mtd->lock_user_prot_reg(mtd, from, len);
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}
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/*
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* kvec-based read/write method. NB: The 'count' parameter is the number of
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* _vectors_, each of which contains an (ofs, len) tuple.
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*/
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static inline 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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{
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*retlen = 0;
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return mtd->writev(mtd, vecs, count, to, retlen);
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}
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static inline void mtd_sync(struct mtd_info *mtd)
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{
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mtd->sync(mtd);
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}
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/* Chip-supported device locking */
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static inline int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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return mtd->lock(mtd, ofs, len);
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}
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static inline int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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return mtd->unlock(mtd, ofs, len);
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}
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static inline int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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return mtd->is_locked(mtd, ofs, len);
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}
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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);
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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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mtd->resume(mtd);
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}
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static inline int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
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{
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return mtd->block_isbad(mtd, ofs);
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}
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static inline int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
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{
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return mtd->block_markbad(mtd, ofs);
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}
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static inline struct mtd_info *dev_to_mtd(struct device *dev)
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{
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return dev ? dev_get_drvdata(dev) : NULL;
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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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/* 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 **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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int default_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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int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
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unsigned long count, loff_t from, size_t *retlen);
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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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#endif /* __MTD_MTD_H__ */
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