/* * 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 1.21 2007/12/13 15:35:18 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 (MTD_VERSION_CODE < MTD_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 (MTD_VERSION_CODE > MTD_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 */}#endifint nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,			     const __u8 * data, const yaffs_Spare * spare){	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;	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;#if (MTD_VERSION_CODE > MTD_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 (MTD_VERSION_CODE > MTD_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 (MTD_VERSION_CODE > MTD_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;}