/* * YAFFS: Yet another FFS. A NAND-flash specific file system.  * yaffs_mtdif.c  NAND mtd wrapper functions. * * Copyright (C) 2002 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 1.10 2005/12/07 22:00:38 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"int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,				      const __u8 * data,				      const yaffs_ExtendedTags * tags){	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);	size_t dummy;	int retval = 0;	loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;	yaffs_PackedTags2 pt;	T(YAFFS_TRACE_MTD,	  (TSTR	   ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"	    TENDSTR), chunkInNAND, data, tags));	if (tags) {		yaffs_PackTags2(&pt, tags);	}	if (data && tags) {		if (dev->useNANDECC)			retval =			    mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,					   &dummy, data, (__u8 *) & pt, NULL);		else			retval =			    mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,					   &dummy, data, (__u8 *) & pt, NULL);	} else {		if (data)			retval =			    mtd->write(mtd, addr, dev->nBytesPerChunk, &dummy,				       data);		if (tags)			retval =			    mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,					   (__u8 *) & pt);	}	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);	size_t dummy;	int retval = 0;	loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;	yaffs_PackedTags2 pt;	T(YAFFS_TRACE_MTD,	  (TSTR	   ("nandmtd2_ReadChunkWithTagsToNAND chunk %d data %p tags %p"	    TENDSTR), chunkInNAND, data, tags));	if (data && tags) {		if (dev->useNANDECC) {			retval =			    mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,					  &dummy, data, dev->spareBuffer,					  NULL);		} else {			retval =			    mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,					  &dummy, data, dev->spareBuffer,					  NULL);		}	} else {		if (data)			retval =			    mtd->read(mtd, addr, dev->nBytesPerChunk, &dummy,				      data);		if (tags)			retval =			    mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,					  dev->spareBuffer);	}	memcpy(&pt, dev->spareBuffer, sizeof(pt));	if (tags)		yaffs_UnpackTags2(tags, &pt);	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->nBytesPerChunk);	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->nBytesPerChunk);	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;}