220 lines
3.7 KiB
C
220 lines
3.7 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* XXX U-BOOT XXX */
|
|
#include <common.h>
|
|
|
|
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;
|
|
}
|