+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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.
- */
-
-#include "yportenv.h"
-#include "yaffs_trace.h"
-
-#include "yaffs_flashif.h"
-#include "yaffs_guts.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(struct yaffs_dev *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("emfile-512-0", 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(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_spare *spare)
-{
- int written;
-
- CheckInit(dev);
-
-
-
- if(data)
- {
- lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
- written = write(filedisk.handle,data,512);
-
- if(written != 512) return YAFFS_FAIL;
- }
-
- if(spare)
- {
- lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
- written = write(filedisk.handle,spare,16);
-
- if(written != 16) return YAFFS_FAIL;
- }
-
-
- return YAFFS_OK;
-
-}
-
-
-int yflash_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_spare *spare)
-{
- int nread;
-
- CheckInit(dev);
-
-
-
- if(data)
- {
- lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
- nread = read(filedisk.handle,data,512);
-
- if(nread != 512) return YAFFS_FAIL;
- }
-
- if(spare)
- {
- lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
- nread= read(filedisk.handle,spare,16);
-
- if(nread != 16) return YAFFS_FAIL;
- }
-
-
- return YAFFS_OK;
-
-}
-
-
-int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
-{
-
- int i;
-
- CheckInit(dev);
-
- if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
- {
- yaffs_trace(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(struct yaffs_dev *dev)
-{
-
- return YAFFS_OK;
-}
-
-
projects / yaffs2.git / blobdiff