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/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2007 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
const char *yaffs_mtdif_c_version =
"$Id: yaffs_mtdif.c,v 1.19 2007-02-14 01:09:06 wookey Exp $";
#include "yportenv.h"
#include "yaffs_mtdif.h"
#include "linux/mtd/mtd.h"
#include "linux/types.h"
#include "linux/time.h"
#include "linux/mtd/nand.h"
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
static struct nand_oobinfo yaffs_oobinfo = {
.useecc = 1,
.eccbytes = 6,
.eccpos = {8, 9, 10, 13, 14, 15}
};
static struct nand_oobinfo yaffs_noeccinfo = {
.useecc = 0,
};
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
{
oob[0] = spare->tagByte0;
oob[1] = spare->tagByte1;
oob[2] = spare->tagByte2;
oob[3] = spare->tagByte3;
oob[4] = spare->tagByte4;
oob[5] = spare->tagByte5 & 0x3f;
oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
oob[6] = spare->tagByte6;
oob[7] = spare->tagByte7;
}
static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
{
struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
spare->tagByte0 = oob[0];
spare->tagByte1 = oob[1];
spare->tagByte2 = oob[2];
spare->tagByte3 = oob[3];
spare->tagByte4 = oob[4];
spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
spare->tagByte6 = oob[6];
spare->tagByte7 = oob[7];
spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
}
#endif
int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
const __u8 * data, const yaffs_Spare * spare)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
struct mtd_oob_ops ops;
#endif
size_t dummy;
int retval = 0;
loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
__u8 spareAsBytes[8]; /* OOB */
if (data && !spare)
retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data);
else if (spare) {
if (dev->useNANDECC) {
translate_spare2oob(spare, spareAsBytes);
ops.mode = MTD_OOB_AUTO;
ops.ooblen = 8; /* temp hack */
} else {
ops.mode = MTD_OOB_RAW;
ops.ooblen = YAFFS_BYTES_PER_SPARE;
}
ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
ops.datbuf = (u8 *)data;
ops.ooboffs = 0;
ops.oobbuf = spareAsBytes;
retval = mtd->write_oob(mtd, addr, &ops);
}
#else
__u8 *spareAsBytes = (__u8 *) spare;
if (data && spare) {
if (dev->useNANDECC)
retval =
mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data, spareAsBytes,
&yaffs_oobinfo);
else
retval =
mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data, spareAsBytes,
&yaffs_noeccinfo);
} else {
if (data)
retval =
mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
data);
if (spare)
retval =
mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
&dummy, spareAsBytes);
}
#endif
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
yaffs_Spare * spare)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
struct mtd_oob_ops ops;
#endif
size_t dummy;
int retval = 0;
loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
__u8 spareAsBytes[8]; /* OOB */
if (data && !spare)
retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data);
else if (spare) {
if (dev->useNANDECC) {
ops.mode = MTD_OOB_AUTO;
ops.ooblen = 8; /* temp hack */
} else {
ops.mode = MTD_OOB_RAW;
ops.ooblen = YAFFS_BYTES_PER_SPARE;
}
ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
ops.datbuf = data;
ops.ooboffs = 0;
ops.oobbuf = spareAsBytes;
retval = mtd->read_oob(mtd, addr, &ops);
if (dev->useNANDECC)
translate_oob2spare(spare, spareAsBytes);
}
#else
__u8 *spareAsBytes = (__u8 *) spare;
if (data && spare) {
if (dev->useNANDECC) {
/* Careful, this call adds 2 ints */
/* to the end of the spare data. Calling function */
/* should allocate enough memory for spare, */
/* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
retval =
mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data, spareAsBytes,
&yaffs_oobinfo);
} else {
retval =
mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data, spareAsBytes,
&yaffs_noeccinfo);
}
} else {
if (data)
retval =
mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
data);
if (spare)
retval =
mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
&dummy, spareAsBytes);
}
#endif
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
__u32 addr =
((loff_t) blockNumber) * dev->nDataBytesPerChunk
* dev->nChunksPerBlock;
struct erase_info ei;
int retval = 0;
ei.mtd = mtd;
ei.addr = addr;
ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
ei.time = 1000;
ei.retries = 2;
ei.callback = NULL;
ei.priv = (u_long) dev;
/* Todo finish off the ei if required */
sema_init(&dev->sem, 0);
retval = mtd->erase(mtd, &ei);
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd_InitialiseNAND(yaffs_Device * dev)
{
return YAFFS_OK;
}
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