/* * 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. * */const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.9 2003/04/08 19:53:44 charles Exp $";#ifdef CONFIG_YAFFS_MTD_ENABLED #include "yportenv.h"#include "yaffs_mtdif.h"#include "linux/mtd/mtd.h"#include "linux/types.h"#include "linux/time.h"#ifndef	CONFIG_YAFFS_USE_OLD_MTD#include "linux/mtd/nand.h"#endifstruct nand_oobinfo yaffs_oobinfo = {	useecc: 1,	eccpos: {8, 9, 10, 13, 14, 15}};struct nand_oobinfo yaffs_noeccinfo = {	useecc: 0,};int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare){	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);	size_t dummy;    int retval = 0;		loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;		__u8 *spareAsBytes = (__u8 *)spare;#ifndef	CONFIG_YAFFS_USE_OLD_MTD	if(data && spare)	{		if(dev->useNANDECC)			mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);		else			mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);	}	else	{#endif	if(data)		retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);	if(spare)		retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);#ifndef	CONFIG_YAFFS_USE_OLD_MTD	}#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);	size_t dummy;    int retval = 0;		loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;		__u8 *spareAsBytes = (__u8 *)spare;	#ifndef	CONFIG_YAFFS_USE_OLD_MTD	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->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);            		}		else		{			retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);		}	}	else	{#endif	if(data)		retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);	if(spare)		retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);#ifndef	CONFIG_YAFFS_USE_OLD_MTD	}#endif    if (retval == 0)    	return YAFFS_OK;    else        return YAFFS_FAIL;}// Callback not needed for NAND#if 0static void nandmtd_EraseCallback(struct erase_info *ei){	yaffs_Device *dev = (yaffs_Device *)ei->priv;		up(&dev->sem);}#endifint nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber){	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);	__u32 addr = ((loff_t) blockNumber) * dev->nBytesPerChunk * dev->nChunksPerBlock;	struct erase_info ei;    int retval = 0;		ei.mtd = mtd;	ei.addr = addr;	ei.len = dev->nBytesPerChunk * 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);			//No need for callback 	// down(&dev->sem); // Wait for the erasure to complete    if (retval == 0)	    	return YAFFS_OK;    else        return YAFFS_FAIL;}int nandmtd_InitialiseNAND(yaffs_Device *dev){	return YAFFS_OK;}#endif // CONFIG_YAFFS_MTD_ENABLED