Openwrt/target/linux/generic-2.6/files-2.6.25/fs/yaffs2/yaffs_mtdif2.c
2008-06-06 12:52:39 +00:00

249 lines
5.9 KiB
C

/*
* 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.
*/
/* mtd interface for YAFFS2 */
const char *yaffs_mtdif2_c_version =
"$Id: yaffs_mtdif2.c,v 1.20 2008-05-05 07:58:58 charles Exp $";
#include "yportenv.h"
#include "yaffs_mtdif2.h"
#include "linux/mtd/mtd.h"
#include "linux/types.h"
#include "linux/time.h"
#include "yaffs_packedtags2.h"
/* NB For use with inband tags....
* We assume that the data buffer is of size totalBytersPerChunk so that we can also
* use it to load the tags.
*/
int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
const __u8 * data,
const yaffs_ExtendedTags * tags)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (MTD_VERSION_CODE > MTD_VERSION(2,6,17))
struct mtd_oob_ops ops;
#else
size_t dummy;
#endif
int retval = 0;
loff_t addr;
yaffs_PackedTags2 pt;
T(YAFFS_TRACE_MTD,
(TSTR
("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
TENDSTR), chunkInNAND, data, tags));
addr = ((loff_t) chunkInNAND) * dev->totalBytesPerChunk;
/* For yaffs2 writing there must be both data and tags.
* If we're using inband tags, then the tags are stuffed into
* the end of the data buffer.
*/
if(!data || !tags)
BUG();
else if(dev->inbandTags){
yaffs_PackedTags2TagsPart *pt2tp;
pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->nDataBytesPerChunk);
yaffs_PackTags2TagsPart(pt2tp,tags);
}
else
yaffs_PackTags2(&pt, tags);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
ops.mode = MTD_OOB_AUTO;
ops.ooblen = (dev->inbandTags) ? 0 : sizeof(pt);
ops.len = dev->totalBytesPerChunk;
ops.ooboffs = 0;
ops.datbuf = (__u8 *)data;
ops.oobbuf = (dev->inbandTags) ? NULL : (void *)&pt;
retval = mtd->write_oob(mtd, addr, &ops);
#else
if (!dev->inbandTags) {
retval =
mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data, (__u8 *) & pt, NULL);
} else {
retval =
mtd->write(mtd, addr, dev->totalBytesPerChunk, &dummy,
data);
}
#endif
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
__u8 * data, yaffs_ExtendedTags * tags)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (MTD_VERSION_CODE > MTD_VERSION(2,6,17))
struct mtd_oob_ops ops;
#endif
size_t dummy;
int retval = 0;
int localData = 0;
loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
yaffs_PackedTags2 pt;
T(YAFFS_TRACE_MTD,
(TSTR
("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
TENDSTR), chunkInNAND, data, tags));
if(dev->inbandTags){
if(!data) {
localData = 1;
data = yaffs_GetTempBuffer(dev,__LINE__);
}
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
if (dev->inbandTags || (data && !tags))
retval = mtd->read(mtd, addr, dev->totalBytesPerChunk,
&dummy, data);
else if (tags) {
ops.mode = MTD_OOB_AUTO;
ops.ooblen = sizeof(pt);
ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
ops.ooboffs = 0;
ops.datbuf = data;
ops.oobbuf = dev->spareBuffer;
retval = mtd->read_oob(mtd, addr, &ops);
}
#else
if (!dev->inbandTags && data && tags) {
retval = mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
&dummy, data, dev->spareBuffer,
NULL);
} else {
if (data)
retval =
mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
data);
if (!dev->inbandTags && tags)
retval =
mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
dev->spareBuffer);
}
#endif
if(dev->inbandTags){
if(tags){
yaffs_PackedTags2TagsPart * pt2tp;
pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
yaffs_UnpackTags2TagsPart(tags,pt2tp);
}
}
else {
if (tags){
memcpy(&pt, dev->spareBuffer, sizeof(pt));
yaffs_UnpackTags2(tags, &pt);
}
}
if(localData)
yaffs_ReleaseTempBuffer(dev,data,__LINE__);
if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
int retval;
T(YAFFS_TRACE_MTD,
(TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
retval =
mtd->block_markbad(mtd,
blockNo * dev->nChunksPerBlock *
dev->nDataBytesPerChunk);
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
yaffs_BlockState * state, int *sequenceNumber)
{
struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
int retval;
T(YAFFS_TRACE_MTD,
(TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
retval =
mtd->block_isbad(mtd,
blockNo * dev->nChunksPerBlock *
dev->nDataBytesPerChunk);
if (retval) {
T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
*state = YAFFS_BLOCK_STATE_DEAD;
*sequenceNumber = 0;
} else {
yaffs_ExtendedTags t;
nandmtd2_ReadChunkWithTagsFromNAND(dev,
blockNo *
dev->nChunksPerBlock, NULL,
&t);
if (t.chunkUsed) {
*sequenceNumber = t.sequenceNumber;
*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
} else {
*sequenceNumber = 0;
*state = YAFFS_BLOCK_STATE_EMPTY;
}
}
T(YAFFS_TRACE_MTD,
(TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
*state));
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}