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90ef117b68
To use YAFFS2 define CONFIG_YAFFS2 Signed-off-by: William Juul <william.juul@tandberg.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
219 lines
3.7 KiB
C
219 lines
3.7 KiB
C
/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2007 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* This provides a YAFFS nand emulation on a file.
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* This is only intended as test code to test persistence etc.
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*/
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/* XXX U-BOOT XXX */
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#include <common.h>
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const char *yaffs_flashif_c_version = "$Id: yaffs_fileem.c,v 1.3 2007/02/14 01:09:06 wookey Exp $";
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#include "yportenv.h"
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#include "yaffs_flashif.h"
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#include "yaffs_guts.h"
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#include "devextras.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define SIZE_IN_MB 16
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#define BLOCK_SIZE (32 * 528)
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#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
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typedef struct
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{
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__u8 data[528]; // Data + spare
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} yflash_Page;
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typedef struct
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{
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yflash_Page page[32]; // The pages in the block
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} yflash_Block;
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typedef struct
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{
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int handle;
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int nBlocks;
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} yflash_Device;
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static yflash_Device filedisk;
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static int CheckInit(yaffs_Device *dev)
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{
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static int initialised = 0;
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int i;
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int fSize;
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int written;
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yflash_Page p;
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if(initialised)
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{
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return YAFFS_OK;
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}
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initialised = 1;
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filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
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filedisk.handle = open("yaffsemfile", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
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if(filedisk.handle < 0)
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{
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perror("Failed to open yaffs emulation file");
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return YAFFS_FAIL;
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}
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fSize = lseek(filedisk.handle,0,SEEK_END);
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if(fSize < SIZE_IN_MB * 1024 * 1024)
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{
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printf("Creating yaffs emulation file\n");
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lseek(filedisk.handle,0,SEEK_SET);
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memset(&p,0xff,sizeof(yflash_Page));
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for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
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{
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written = write(filedisk.handle,&p,sizeof(yflash_Page));
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if(written != sizeof(yflash_Page))
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{
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printf("Write failed\n");
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return YAFFS_FAIL;
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}
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}
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}
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return 1;
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}
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int yflash_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
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{
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int written;
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CheckInit(dev);
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if(data)
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{
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lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
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written = write(filedisk.handle,data,512);
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if(written != 512) return YAFFS_FAIL;
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}
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if(spare)
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{
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lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
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written = write(filedisk.handle,spare,16);
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if(written != 16) return YAFFS_FAIL;
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}
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return YAFFS_OK;
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}
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int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
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{
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int nread;
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CheckInit(dev);
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if(data)
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{
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lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
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nread = read(filedisk.handle,data,512);
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if(nread != 512) return YAFFS_FAIL;
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}
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if(spare)
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{
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lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
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nread= read(filedisk.handle,spare,16);
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if(nread != 16) return YAFFS_FAIL;
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}
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return YAFFS_OK;
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}
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int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
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{
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int i;
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CheckInit(dev);
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if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
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{
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T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
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return YAFFS_FAIL;
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}
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else
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{
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yflash_Page pg;
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memset(&pg,0xff,sizeof(yflash_Page));
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lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
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for(i = 0; i < 32; i++)
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{
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write(filedisk.handle,&pg,528);
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}
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return YAFFS_OK;
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}
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}
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int yflash_InitialiseNAND(yaffs_Device *dev)
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{
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dev->useNANDECC = 1; // force on useNANDECC which gets faked.
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// This saves us doing ECC checks.
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return YAFFS_OK;
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}
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