/* * YAFFS: Yet another FFS. A NAND-flash specific file system.  * * 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 1.2 2007/03/07 08:05:58 colin 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"void nandmtd2_pt2buf(yaffs_Device *dev, yaffs_PackedTags2 *pt, int is_raw){	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);	__u8 *ptab = (__u8 *)pt; /* packed tags as bytes */		int	i, j = 0, k, n;	/* Pack buffer with 0xff */	for (i = 0; i < mtd->oobsize; i++)		dev->spareBuffer[i] = 0xff;			if(!is_raw){		memcpy(dev->spareBuffer,pt,sizeof(yaffs_PackedTags2));	} else {		j = 0;		k = mtd->oobinfo.oobfree[j][0];		n = mtd->oobinfo.oobfree[j][1];		if (n == 0) {			T(YAFFS_TRACE_ERROR, (TSTR("No OOB space for tags" TENDSTR)));			YBUG();		}		for (i = 0; i < sizeof(yaffs_PackedTags2); i++) {			if (n == 0) {				j++;				k = mtd->oobinfo.oobfree[j][0];				n = mtd->oobinfo.oobfree[j][1];				if (n == 0) {					T(YAFFS_TRACE_ERROR, (TSTR("No OOB space for tags" TENDSTR)));					YBUG();				}			}			dev->spareBuffer[k] = ptab[i];			k++;			n--;		}	}}void nandmtd2_buf2pt(yaffs_Device *dev, yaffs_PackedTags2 *pt, int is_raw){	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);	int	i, j = 0, k, n;	__u8 *ptab = (__u8 *)pt; /* packed tags as bytes */	if (!is_raw) {			memcpy(pt,dev->spareBuffer,sizeof(yaffs_PackedTags2));	} else {		j = 0;		k = mtd->oobinfo.oobfree[j][0];		n = mtd->oobinfo.oobfree[j][1];		if (n == 0) {			T(YAFFS_TRACE_ERROR, (TSTR("No space in OOB for tags" TENDSTR)));			YBUG();		}		for (i = 0; i < sizeof(yaffs_PackedTags2); i++) {			if (n == 0) {				j++;				k = mtd->oobinfo.oobfree[j][0];				n = mtd->oobinfo.oobfree[j][1];				if (n == 0) {					T(YAFFS_TRACE_ERROR, (TSTR("No space in OOB for tags" TENDSTR)));					YBUG();				}			}			ptab[i] = dev->spareBuffer[k];			k++;			n--;		}	}		}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) {	                nandmtd2_pt2buf(dev, &pt, 0);			retval =			    mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,					   &dummy, data, dev->spareBuffer,					   NULL);	} else {			T(YAFFS_TRACE_ALWAYS,		  (TSTR		  ("Write chunk with null tags or data!" TENDSTR)));		YBUG(); 	}	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 (0 && data && tags) {			retval =			    mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,					  &dummy, data, dev->spareBuffer,					  NULL);			nandmtd2_buf2pt(dev, &pt, 0);	} 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);			nandmtd2_buf2pt(dev, &pt, 1);		}	}	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 OK seq %d state %d" TENDSTR), *sequenceNumber,		   *state));	}	if (retval == 0)		return YAFFS_OK;	else		return YAFFS_FAIL;}