1 files changed, 363 insertions, 0 deletions
diff --git a/fs/yaffs2/direct/yaffs_ramem2k.c b/fs/yaffs2/direct/yaffs_ramem2k.c
new file mode 100644
index 0000000..1ab053c
--- /dev/null
+++ b/fs/yaffs2/direct/yaffs_ramem2k.c
@@ -0,0 +1,363 @@
+/*
+ * 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.
+ */
+
+/*
+ * yaffs_ramem2k.c: RAM emulation in-kernel for 2K pages (YAFFS2)
+ */
+
+
+const char *yaffs_ramem2k_c_version = "$Id: yaffs_ramem2k.c,v 1.3 2007/02/14 01:09:06 wookey Exp $";
+
+#ifndef __KERNEL__
+#define CONFIG_YAFFS_RAM_ENABLED
+#else
+#include <linux/config.h>
+#endif
+
+#ifdef CONFIG_YAFFS_RAM_ENABLED
+
+#include "yportenv.h"
+
+#include "yaffs_nandemul2k.h"
+#include "yaffs_guts.h"
+#include "yaffsinterface.h"
+#include "devextras.h"
+#include "yaffs_packedtags2.h"
+
+
+
+#define EM_SIZE_IN_MEG (32)
+#define PAGE_DATA_SIZE  (2048)
+#define PAGE_SPARE_SIZE (64)
+#define PAGES_PER_BLOCK (64)
+
+
+
+#define EM_SIZE_IN_BYTES (EM_SIZE_IN_MEG * (1<<20))
+
+#define PAGE_TOTAL_SIZE (PAGE_DATA_SIZE+PAGE_SPARE_SIZE)
+
+#define BLOCK_TOTAL_SIZE (PAGES_PER_BLOCK * PAGE_TOTAL_SIZE)
+
+#define BLOCKS_PER_MEG ((1<<20)/(PAGES_PER_BLOCK * PAGE_DATA_SIZE))
+
+
+typedef struct 
+{
+	__u8 data[PAGE_TOTAL_SIZE]; // Data + spare
+	int empty;      // is this empty?
+} nandemul_Page;
+
+
+typedef struct
+{
+	nandemul_Page *page[PAGES_PER_BLOCK];
+	int damaged;	
+} nandemul_Block;
+
+
+
+typedef struct
+{
+	nandemul_Block**block;
+	int nBlocks;
+} nandemul_Device;
+
+static nandemul_Device ned;
+
+static int sizeInMB = EM_SIZE_IN_MEG;
+
+
+static void nandemul_yield(int n)
+{
+#ifdef __KERNEL__
+	if(n > 0) schedule_timeout(n);
+#endif
+
+}
+
+
+static void nandemul_ReallyEraseBlock(int blockNumber)
+{
+	int i;
+	
+	nandemul_Block *blk;
+	
+	if(blockNumber < 0 || blockNumber >= ned.nBlocks)
+	{
+		return;
+	}
+	
+	blk = ned.block[blockNumber];
+	
+	for(i = 0; i < PAGES_PER_BLOCK; i++)
+	{
+		memset(blk->page[i],0xff,sizeof(nandemul_Page));
+		blk->page[i]->empty = 1;
+	}
+	nandemul_yield(2);
+}
+
+
+static int nandemul2k_CalcNBlocks(void)
+{
+	return EM_SIZE_IN_MEG * BLOCKS_PER_MEG;
+}
+
+
+
+static int  CheckInit(void)
+{
+	static int initialised = 0;
+	
+	int i,j;
+	
+	int fail = 0;
+	int nBlocks; 
+
+	int nAllocated = 0;
+	
+	if(initialised) 
+	{
+		return YAFFS_OK;
+	}
+	
+	
+	ned.nBlocks = nBlocks = nandemul2k_CalcNBlocks();
+
+	
+	ned.block = YMALLOC(sizeof(nandemul_Block*) * nBlocks );
+	
+	if(!ned.block) return YAFFS_FAIL;
+	
+	
+	
+
+		
+	for(i=fail=0; i <nBlocks; i++)
+	{
+		
+		nandemul_Block *blk;
+		
+		if(!(blk = ned.block[i] = YMALLOC(sizeof(nandemul_Block))))
+		{
+		 fail = 1;
+		}  
+		else
+		{
+			for(j = 0; j < PAGES_PER_BLOCK; j++)
+			{
+				if((blk->page[j] = YMALLOC(sizeof(nandemul_Page))) == 0)
+				{
+					fail = 1;
+				}
+			}
+			nandemul_ReallyEraseBlock(i);
+			ned.block[i]->damaged = 0;
+			nAllocated++;
+		}
+	}
+	
+	if(fail)
+	{
+		//Todo thump pages
+		
+		for(i = 0; i < nAllocated; i++)
+		{
+			YFREE(ned.block[i]);
+		}
+		YFREE(ned.block);
+		
+		T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
+		   nAllocated/64,sizeInMB));
+		return 0;
+	}
+	
+	ned.nBlocks = nBlocks;
+	
+	initialised = 1;
+	
+	return 1;
+}
+
+int nandemul2k_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
+{
+	int blk;
+	int pg;
+	int i;
+	
+	__u8 *x;
+
+	
+	blk = chunkInNAND/PAGES_PER_BLOCK;
+	pg = chunkInNAND%PAGES_PER_BLOCK;
+	
+	
+	if(data)
+	{
+		x = ned.block[blk]->page[pg]->data;
+		
+		for(i = 0; i < PAGE_DATA_SIZE; i++)
+		{
+			x[i] &=data[i];
+		}
+
+		ned.block[blk]->page[pg]->empty = 0;
+	}
+	
+	
+	if(tags)
+	{
+		x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
+		
+		yaffs_PackTags2((yaffs_PackedTags2 *)x,tags);
+			
+	}
+	
+	if(tags || data)
+	{
+		nandemul_yield(1);
+	}
+
+	return YAFFS_OK;
+}
+
+
+int nandemul2k_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
+{
+	int blk;
+	int pg;
+	
+	__u8 *x;
+
+	
+	
+	blk = chunkInNAND/PAGES_PER_BLOCK;
+	pg = chunkInNAND%PAGES_PER_BLOCK;
+	
+	
+	if(data)
+	{
+		memcpy(data,ned.block[blk]->page[pg]->data,PAGE_DATA_SIZE);
+	}
+	
+	
+	if(tags)
+	{
+		x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
+		
+		yaffs_UnpackTags2(tags,(yaffs_PackedTags2 *)x);
+	}
+
+	return YAFFS_OK;
+}
+
+
+static int nandemul2k_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
+{
+	int blk;
+	int pg;
+	int i;
+
+	
+	
+	blk = chunkInNAND/PAGES_PER_BLOCK;
+	pg = chunkInNAND%PAGES_PER_BLOCK;
+	
+	
+	for(i = 0; i < PAGE_TOTAL_SIZE; i++)
+	{
+		if(ned.block[blk]->page[pg]->data[i] != 0xFF)
+		{
+			return YAFFS_FAIL;
+		}
+	}
+
+	return YAFFS_OK;
+
+}
+
+int nandemul2k_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+	
+	
+	if(blockNumber < 0 || blockNumber >= ned.nBlocks)
+	{
+		T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
+	}
+	else if(ned.block[blockNumber]->damaged)
+	{
+		T(YAFFS_TRACE_ALWAYS,("Attempt to erase damaged block %d\n",blockNumber));
+	}
+	else
+	{
+		nandemul_ReallyEraseBlock(blockNumber);
+	}
+	
+	return YAFFS_OK;
+}
+
+int nandemul2k_InitialiseNAND(yaffs_Device *dev)
+{
+	CheckInit();
+	return YAFFS_OK;
+}
+ 
+int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+{
+	
+	__u8 *x;
+	
+	x = &ned.block[blockNo]->page[0]->data[PAGE_DATA_SIZE];
+	
+	memset(x,0,sizeof(yaffs_PackedTags2));
+	
+	
+	return YAFFS_OK;
+	
+}
+
+int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
+{
+	yaffs_ExtendedTags tags;
+	int chunkNo;
+
+	*sequenceNumber = 0;
+	
+	chunkNo = blockNo * dev->nChunksPerBlock;
+	
+	nandemul2k_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
+	if(tags.blockBad)
+	{
+		*state = YAFFS_BLOCK_STATE_DEAD;
+	}
+	else if(!tags.chunkUsed)
+	{
+		*state = YAFFS_BLOCK_STATE_EMPTY;
+	}
+	else if(tags.chunkUsed)
+	{
+		*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+		*sequenceNumber = tags.sequenceNumber;
+	}
+	return YAFFS_OK;
+}
+
+int nandemul2k_GetBytesPerChunk(void) { return PAGE_DATA_SIZE;}
+
+int nandemul2k_GetChunksPerBlock(void) { return PAGES_PER_BLOCK; }
+int nandemul2k_GetNumberOfBlocks(void) {return nandemul2k_CalcNBlocks();}
+
+
+#endif //YAFFS_RAM_ENABLED
+