yaffs_flashif.c

Atmel 91系列ARM的boot loader启动代码

/*
 * YAFFS: Yet another FFS. A NAND-flash specific file system. 
 * yaffs_mtdif.c  NAND mtd wrapper functions.
 *
 * Copyright (C) 2002 Aleph One Ltd.
 *   for Toby Churchill Ltd and Brightstar Engineering
 *
 * Created by Charles Manning <[e-mail]>
 *
 * 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.
 *
 */

//#if (CONFIG_COMMANDS & CFG_CMD_YAFFS)
 
//#include "yportenv.h"

#include "yaffs_flashif.h"

//#include "linux/mtd/mtd.h"
#include "linux/types.h"
//#include "linux/time.h"
#include "linux/mtd/nand.h"

extern int nand_read_ecc(struct nand_chip *nand, size_t start, size_t len,
		 size_t * retlen, u_char *buf, u_char *ecc_code);
extern int nand_read_oob(struct nand_chip* nand, size_t ofs, size_t len,
		 size_t * retlen, u_char * buf);
                 
#if 0
int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
	size_t dummy;
    int retval = 0;
	
	loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
	
	__u8 *spareAsBytes = (__u8 *)spare;

#ifndef	CONFIG_YAFFS_USE_OLD_MTD
	if(data && spare)
	{
		if(dev->useNANDECC)
			mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
		else
			mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
	}
	else
	{
#endif
	if(data)
		retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
	if(spare)
		retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
#ifndef	CONFIG_YAFFS_USE_OLD_MTD
	}
#endif

    if (retval == 0)
    	return YAFFS_OK;
    else
        return YAFFS_FAIL;
}
#endif
int ReadChunkFromNAND(yaffs_Device *dev, int chunkInNAND, __u8 *data, yaffs_Spare *spare)
{
	struct nand_chip *nand = (struct nand_chip *)(dev->genericDevice);
	size_t dummy;
        int retval = 0;
        static __u8 ecc_dummy[3];
	
	loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
	
	__u8 *spareAsBytes = (__u8 *)spare;
	
	if(data)
		retval = nand_read_ecc(nand,addr,dev->nBytesPerChunk,&dummy,data,ecc_dummy);
	if(spare)
		retval = nand_read_oob(nand,addr,YAFFS_BYTES_PER_SPARE,&dummy,spare);

    if (retval == 0)
    	return YAFFS_OK;
    else
        return YAFFS_FAIL;
}

// Callback not needed for NAND
#if 0
static void nandmtd_EraseCallback(struct erase_info *ei)
{
	yaffs_Device *dev = (yaffs_Device *)ei->priv;	
	up(&dev->sem);
}
#endif

#if 0
int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
	__u32 addr = ((loff_t) blockNumber) * dev->nBytesPerChunk * dev->nChunksPerBlock;
	struct erase_info ei;
    int retval = 0;
	
	ei.mtd = mtd;
	ei.addr = addr;
	ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
	ei.time = 1000;
	ei.retries = 2;
	ei.callback = NULL;
	ei.priv = (u_long)dev;
	
	// Todo finish off the ei if required
	
	sema_init(&dev->sem,0);

	retval = mtd->erase(mtd,&ei);	
	
	//No need for callback 
	// down(&dev->sem); // Wait for the erasure to complete

    if (retval == 0)	
    	return YAFFS_OK;
    else
        return YAFFS_FAIL;
}
#endif
int InitialiseNAND(yaffs_Device *dev)
{
	return YAFFS_OK;
}

//#endif // CONFIG_YAFFS_MTD_ENABLED