/*
 * 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 1.1 2004/12/17 04:39:04 charles Exp $";

#include <linux/config.h>

#ifdef CONFIG_YAFFS_MTD_ENABLED
 
#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 %8p tags %8p\n"),
				chunkInNAND, data, tags));	

	if(tags)
		yaffs_PackTags2(&pt,tags);

#ifndef	CONFIG_YAFFS_USE_OLD_MTD
	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 {
#endif
		if(data)
			retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
		if(tags)
			retval = mtd->write_oob(mtd,addr,mtd->oobsize,&dummy,(__u8 *)&pt);
		
#ifndef	CONFIG_YAFFS_USE_OLD_MTD
	}
#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);
	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 %8p tags %8p\n"),
				chunkInNAND, data, tags));	

#ifndef	CONFIG_YAFFS_USE_OLD_MTD
	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 {
#endif
		if(data)
			retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
		if(tags)
			retval = mtd->read_oob(mtd,addr,mtd->oobsize,&dummy,dev->spareBuffer);
#ifndef	CONFIG_YAFFS_USE_OLD_MTD
	}
#endif

    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\n"),blockNo));	
	
	retval = mtd->block_markbad(mtd,blockNo);

	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\n"),blockNo));	
	retval = mtd->block_isbad(mtd,blockNo);
	
	if(retval) {
		T(YAFFS_TRACE_MTD,(TSTR("block is bad\n")));
	
		*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\n"), *sequenceNumber,*state));

	if (retval == 0)
    		return YAFFS_OK;
	else
	       	return YAFFS_FAIL;
}

#endif