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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.
*/
/*
* This provides a YAFFS nand emulation on a file.
* This is only intended as test code to test persistence etc.
*/
const char *yaffs_flashif_c_version = "$Id: yaffs_fileem.c,v 1.3 2007/02/14 01:09:06 wookey Exp $";
#include "yportenv.h"
#include "yaffs_flashif.h"
#include "yaffs_guts.h"
#include "devextras.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define SIZE_IN_MB 16
#define BLOCK_SIZE (32 * 528)
#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
typedef struct
{
__u8 data[528]; // Data + spare
} yflash_Page;
typedef struct
{
yflash_Page page[32]; // The pages in the block
} yflash_Block;
typedef struct
{
int handle;
int nBlocks;
} yflash_Device;
static yflash_Device filedisk;
static int CheckInit(yaffs_Device *dev)
{
static int initialised = 0;
int i;
int fSize;
int written;
yflash_Page p;
if(initialised)
{
return YAFFS_OK;
}
initialised = 1;
filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
filedisk.handle = open("yaffsemfile", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
if(filedisk.handle < 0)
{
perror("Failed to open yaffs emulation file");
return YAFFS_FAIL;
}
fSize = lseek(filedisk.handle,0,SEEK_END);
if(fSize < SIZE_IN_MB * 1024 * 1024)
{
printf("Creating yaffs emulation file\n");
lseek(filedisk.handle,0,SEEK_SET);
memset(&p,0xff,sizeof(yflash_Page));
for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
{
written = write(filedisk.handle,&p,sizeof(yflash_Page));
if(written != sizeof(yflash_Page))
{
printf("Write failed\n");
return YAFFS_FAIL;
}
}
}
return 1;
}
int yflash_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
{
int written;
CheckInit(dev);
if(data)
{
lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
written = write(filedisk.handle,data,512);
if(written != 512) return YAFFS_FAIL;
}
if(spare)
{
lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
written = write(filedisk.handle,spare,16);
if(written != 16) return YAFFS_FAIL;
}
return YAFFS_OK;
}
int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
{
int nread;
CheckInit(dev);
if(data)
{
lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
nread = read(filedisk.handle,data,512);
if(nread != 512) return YAFFS_FAIL;
}
if(spare)
{
lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
nread= read(filedisk.handle,spare,16);
if(nread != 16) return YAFFS_FAIL;
}
return YAFFS_OK;
}
int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
{
int i;
CheckInit(dev);
if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
{
T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
return YAFFS_FAIL;
}
else
{
yflash_Page pg;
memset(&pg,0xff,sizeof(yflash_Page));
lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
for(i = 0; i < 32; i++)
{
write(filedisk.handle,&pg,528);
}
return YAFFS_OK;
}
}
int yflash_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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