From: charles <charles>
Date: Mon, 9 Feb 2009 03:20:33 +0000 (+0000)
Subject: Add experimental yaffs_nandif.[ch]
X-Git-Tag: pre-name-change~222
X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=commitdiff_plain;h=eec9a1ffcc9ff838440fe6e833d7205ecd8a64ea

Add experimental yaffs_nandif.[ch]
---

diff --git a/direct/yaffs_nandif.c b/direct/yaffs_nandif.c
new file mode 100644
index 0000000..6216b86
--- /dev/null
+++ b/direct/yaffs_nandif.c
@@ -0,0 +1,245 @@
+
+/*
+ * 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.
+ */
+
+
+
+
+#include "yportenv.h"
+#include "yaffs_guts.h"
+#include "devextras.h"
+
+
+#include "yaffs_nandif.h"
+#include "yaffs_packedtags2.h"
+
+
+#if 0
+
+
+static unsigned char *DevBufferIn(yaffs_Device *dev)
+{
+	yfsd_WinCEDevice *cedev = (yfsd_WinCEDevice *)(dev->genericDevice);
+	return cedev->bufferIn;
+}
+static unsigned char *DevBufferOut(yaffs_Device *dev)
+{
+	yfsd_WinCEDevice *cedev = (yfsd_WinCEDevice *)(dev->genericDevice);
+	return cedev->bufferOut;
+}
+
+static unsigned DevBufferSize(yaffs_Device *dev)
+{
+	yfsd_WinCEDevice *cedev = (yfsd_WinCEDevice *)(dev->genericDevice);
+	return cedev->bufferSize;
+}
+
+#endif
+
+/* NB For use with inband tags....
+ * We assume that the data buffer is of size totalBytersPerChunk so that we can also
+ * use it to load the tags.
+ */
+int ynandif_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
+				      const __u8 * data,
+				      const yaffs_ExtendedTags * tags)
+{
+
+	int retval = 0;
+	yaffs_PackedTags2 pt;
+	void *spare;
+	unsigned spareSize = 0;
+
+	unsigned char *bufferIn   = DevBufferIn(dev);
+	unsigned char *bufferOut  = DevBufferOut(dev);
+	unsigned       bufferSize = DevBufferSize(dev);
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
+	    TENDSTR), chunkInNAND, data, tags));
+	    
+
+	/* For yaffs2 writing there must be both data and tags.
+	 * If we're using inband tags, then the tags are stuffed into
+	 * the end of the data buffer.
+	 */
+
+	if(dev->inbandTags){
+		yaffs_PackedTags2TagsPart *pt2tp;
+		pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->nDataBytesPerChunk);
+		yaffs_PackTags2TagsPart(pt2tp,tags);
+		spare = NULL;
+		spareSize = 0;
+	}
+	else{
+		yaffs_PackTags2(&pt, tags);
+		spare = &pt;
+		spareSize = sizeof(yaffs_PackedTags2);
+	}
+	
+	yramsim_WritePage(chunkInNAND,
+					  data, dev->totalBytesPerChunk, spare, spareSize);
+
+	return YAFFS_OK;
+}
+
+int ynandif_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
+				       __u8 * data, yaffs_ExtendedTags * tags)
+{
+	yaffs_PackedTags2 pt;
+	int localData = 0;
+	void *spare = NULL;
+	unsigned spareSize;
+	int eccStatus; //0 = ok, 1 = fixed, -1 = unfixed
+
+	unsigned char *bufferIn   = DevBufferIn(dev);
+	unsigned char *bufferOut  = DevBufferOut(dev);
+	unsigned       bufferSize = DevBufferSize(dev);
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
+	    TENDSTR), chunkInNAND, data, tags));
+	    
+	if(!tags){
+		spare = NULL;
+		spareSize = 0;
+	}else if(dev->inbandTags){
+		
+		if(!data) {
+			localData = 1;
+			data = yaffs_GetTempBuffer(dev,__LINE__);
+		}
+		spare = NULL;
+		spareSize = 0;
+	}
+	else {
+		spare = &pt;
+		spareSize = sizeof(yaffs_PackedTags2);
+	}
+
+	yramsim_ReadPage(chunkInNAND,
+					 data,data ? dev->totalBytesPerChunk : 0,
+					 spare,spareSize,
+					 &eccStatus);
+
+
+
+	if(dev->inbandTags){
+		if(tags){
+			yaffs_PackedTags2TagsPart * pt2tp;
+			pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];	
+			yaffs_UnpackTags2TagsPart(tags,pt2tp);
+		}
+	}
+	else {
+		if (tags){
+			yaffs_UnpackTags2(tags, &pt);
+		}
+	}
+
+	if(tags && tags->chunkUsed){
+		if(eccStatus == 0)
+			tags->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+		else if(eccStatus < 0)
+			tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
+		else
+			tags->eccResult = YAFFS_ECC_RESULT_FIXED;
+	}
+
+	if(localData)
+		yaffs_ReleaseTempBuffer(dev,data,__LINE__);
+	
+	return YAFFS_OK;
+}
+
+int ynandif_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockId)
+{
+
+	yramsim_MarkBlockBad(blockId);
+
+	return YAFFS_OK;
+}
+
+int ynandif_EraseBlockInNAND(struct yaffs_DeviceStruct *dev, int blockId)
+{
+
+	yramsim_EraseBlock(blockId);
+
+	return YAFFS_OK;
+}
+
+
+static int ynandif_IsBlockOk(struct yaffs_DeviceStruct *dev, int blockId)
+{
+	return yramsim_CheckBlockOk(blockId);
+}
+
+int ynandif_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockId, yaffs_BlockState *state, __u32 *sequenceNumber)
+{
+	unsigned chunkNo;
+	yaffs_ExtendedTags tags;
+
+	*sequenceNumber = 0;
+	
+	chunkNo = blockId * dev->nChunksPerBlock;
+	
+	if(!ynandif_IsBlockOk(dev,blockId)){
+		*state = YAFFS_BLOCK_STATE_DEAD;
+	} 
+	else 
+	{
+		ynandif_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
+
+		if(!tags.chunkUsed)
+		{
+			*state = YAFFS_BLOCK_STATE_EMPTY;
+		}
+		else 
+		{
+			*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+			*sequenceNumber = tags.sequenceNumber;
+		}
+	}
+
+	return YAFFS_OK;
+}
+
+
+int ynandif_GetGeometry(yaffs_Device *dev, ynandif_Geometry *geometry)
+{
+
+	yramsim_Geometry g;
+
+	yramsim_GetGeometry(&g);
+	geometry->startBlock = g.startBlock;
+	geometry->endBlock = g.endBlock;
+	geometry->dataSize = g.dataSize;
+	geometry->spareSize = g.spareSize;
+	geometry->pagesPerBlock = g.pagesPerBlock;
+	geometry->hasECC = g.hasECC;
+	geometry->inbandTags = g.inbandTags;
+	geometry->useYaffs2 = g.useYaffs2;
+
+	return YAFFS_OK;
+
+}
+
+int ynandif_InitialiseNAND(yaffs_Device *dev)
+{
+
+	yramsim_Initialise();
+
+	return YAFFS_OK;
+}
diff --git a/direct/yaffs_nandif.h b/direct/yaffs_nandif.h
new file mode 100644
index 0000000..1a17262
--- /dev/null
+++ b/direct/yaffs_nandif.h
@@ -0,0 +1,40 @@
+/*
+ * 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 Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YNANDIF_H__
+#define __YNANDIF_H__
+
+#include "yaffs_guts.h"
+
+typedef struct {
+		unsigned startBlock;
+		unsigned endBlock;
+		unsigned dataSize;		// Number of data bytes per page
+		unsigned spareSize;		// Number of spare bytes per chunk
+		unsigned pagesPerBlock;
+		unsigned hasECC;
+		unsigned inbandTags;	// Use inband tags on this device
+		unsigned useYaffs2;
+} ynandif_Geometry;
+
+int ynandif_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags);
+int ynandif_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int ynandif_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
+int ynandif_InitialiseNAND(yaffs_Device *dev);
+int ynandif_MarkNANDBlockBad(yaffs_Device *dev,int blockNumber);
+int ynandif_QueryNANDBlock(yaffs_Device *dev, int blockNo, yaffs_BlockState *state, __u32 *sequenceNumber);
+int ynandif_GetGeometry(yaffs_Device *dev, ynandif_Geometry *geometry);
+#endif