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/*
* 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_ramdisk.c: yaffs ram disk component
* This provides a ram disk under yaffs.
* NB this is not intended for NAND emulation.
* Use this with dev->useNANDECC enabled, then ECC overheads are not required.
*/
const char *yaffs_ramdisk_c_version = "$Id: yaffs_ramdisk.c,v 1.4 2007/02/14 01:09:06 wookey Exp $";
#include "yportenv.h"
#include "yaffs_ramdisk.h"
#include "yaffs_guts.h"
#include "devextras.h"
#include "yaffs_packedtags1.h"
#define SIZE_IN_MB 2
#define BLOCK_SIZE (32 * 528)
#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
typedef struct
{
__u8 data[528]; // Data + spare
} yramdisk_Page;
typedef struct
{
yramdisk_Page page[32]; // The pages in the block
} yramdisk_Block;
typedef struct
{
yramdisk_Block **block;
int nBlocks;
} yramdisk_Device;
static yramdisk_Device ramdisk;
static int CheckInit(yaffs_Device *dev)
{
static int initialised = 0;
int i;
int fail = 0;
//int nBlocks;
int nAllocated = 0;
if(initialised)
{
return YAFFS_OK;
}
initialised = 1;
ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
ramdisk.block = YMALLOC(sizeof(yramdisk_Block *) * ramdisk.nBlocks);
if(!ramdisk.block) return 0;
for(i=0; i <ramdisk.nBlocks; i++)
{
ramdisk.block[i] = NULL;
}
for(i=0; i <ramdisk.nBlocks && !fail; i++)
{
if((ramdisk.block[i] = YMALLOC(sizeof(yramdisk_Block))) == 0)
{
fail = 1;
}
else
{
yramdisk_EraseBlockInNAND(dev,i);
nAllocated++;
}
}
if(fail)
{
for(i = 0; i < nAllocated; i++)
{
YFREE(ramdisk.block[i]);
}
YFREE(ramdisk.block);
T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
nAllocated/64,ramdisk.nBlocks * 528));
return 0;
}
return 1;
}
int yramdisk_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
{
int blk;
int pg;
CheckInit(dev);
blk = chunkInNAND/32;
pg = chunkInNAND%32;
if(data)
{
memcpy(ramdisk.block[blk]->page[pg].data,data,512);
}
if(tags)
{
yaffs_PackedTags1 pt;
yaffs_PackTags1(&pt,tags);
memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
}
return YAFFS_OK;
}
int yramdisk_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
{
int blk;
int pg;
CheckInit(dev);
blk = chunkInNAND/32;
pg = chunkInNAND%32;
if(data)
{
memcpy(data,ramdisk.block[blk]->page[pg].data,512);
}
if(tags)
{
yaffs_PackedTags1 pt;
memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(pt));
yaffs_UnpackTags1(tags,&pt);
}
return YAFFS_OK;
}
int yramdisk_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
{
int blk;
int pg;
int i;
CheckInit(dev);
blk = chunkInNAND/32;
pg = chunkInNAND%32;
for(i = 0; i < 528; i++)
{
if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
{
return YAFFS_FAIL;
}
}
return YAFFS_OK;
}
int yramdisk_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
{
CheckInit(dev);
if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
{
T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
return YAFFS_FAIL;
}
else
{
memset(ramdisk.block[blockNumber],0xFF,sizeof(yramdisk_Block));
return YAFFS_OK;
}
}
int yramdisk_InitialiseNAND(yaffs_Device *dev)
{
//dev->useNANDECC = 1; // force on useNANDECC which gets faked.
// This saves us doing ECC checks.
return YAFFS_OK;
}
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