nand.c

某培训中心的实验代码

#include "def.h"
#include "2410addr.h"
#include "2410lib.h" 

#define	EnNandFlash()	(rNFCONF |= 0x8000)
#define	DsNandFlash()	(rNFCONF &= ~0x8000)
#define	InitEcc()		(rNFCONF |= 0x1000)
#define	NoEcc()			(rNFCONF &= ~0x1000)
#define	NFChipEn()		(rNFCONF &= ~0x800)
#define	NFChipDs()		(rNFCONF |= 0x800)

#define	WrNFCmd(cmd)	(rNFCMD = (cmd))
#define	WrNFAddr(addr)	(rNFADDR = (addr))
#define	WrNFDat(dat)	(rNFDATA = (dat))
#define	RdNFDat()		(rNFDATA)
#define	RdNFStat()		(rNFSTAT)
#define	NFIsBusy()		(!(rNFSTAT&1))
#define	NFIsReady()		(rNFSTAT&1)

//#define	WIAT_BUSY_HARD	1
//#define	ER_BAD_BLK_TEST
//#define	WR_BAD_BLK_TEST

#define	READCMD0	0
#define	READCMD1	1
#define	READCMD2	0x50
#define	ERASECMD0	0x60
#define	ERASECMD1	0xd0
#define	PROGCMD0	0x80
#define	PROGCMD1	0x10
#define	QUERYCMD	0x70
#define	RdIDCMD		0x90



void InitNandCfg(void)
{
	//enable nand flash control, initilize ecc, chip disable,
	rNFCONF = (1<<15)|(1<<12)|(1<<11)|(7<<8)|(7<<4)|(7);	
}

#ifdef	WIAT_BUSY_HARD
#define	WaitNFBusy()	while(NFIsBusy())
#else
static U32 WaitNFBusy(void)	// R/B 未接好?
{
	U8 stat;
	
	WrNFCmd(QUERYCMD);
	do {
		stat = RdNFDat();
		//Uart_Printf("%x\n", stat);
	}while(!(stat&0x40));
	WrNFCmd(READCMD0);
	return stat&1;
}
#endif

U32 ReadChipId(void)
{
	U32 id;
	
	NFChipEn();	
	WrNFCmd(RdIDCMD);
	WrNFAddr(0);
	while(NFIsBusy());	
	id  = RdNFDat()<<8;
	id |= RdNFDat();		
	NFChipDs();		
	
	return id;
}

static U16 ReadStatus(void)
{
	U16 stat;
	
	NFChipEn();	
	WrNFCmd(QUERYCMD);		
	stat = RdNFDat();	
	NFChipDs();
	
	return stat;
}

U32 EraseBlock(U32 addr)
{
	U8 stat;

	//addr &= ~0x1f;
		
	NFChipEn();	
	WrNFCmd(ERASECMD0);		
	WrNFAddr(addr);
	WrNFAddr(addr>>8);
	WrNFAddr(addr>>16);
	WrNFCmd(ERASECMD1);		
	stat = WaitNFBusy();
	NFChipDs();	

		
	return stat;
}

//addr = page address
void ReadPage(U32 addr, U8 *buf)
{
	U16 i;
	
	NFChipEn();
	WrNFCmd(READCMD0);
	WrNFAddr(0);
	WrNFAddr(addr);
	WrNFAddr(addr>>8);
	WrNFAddr(addr>>16);
	InitEcc();
	WaitNFBusy();
	for(i=0; i<512; i++)
		buf[i] = RdNFDat();
	NFChipDs();
}

U32 WritePage(U32 addr, U8 *buf)
{
	U16 i;
	U8 stat, tmp[3];
	
	NFChipEn();
	WrNFCmd(PROGCMD0);
	WrNFAddr(0);
	WrNFAddr(addr);
	WrNFAddr(addr>>8);
	WrNFAddr(addr>>16);
	InitEcc();	
	for(i=0; i<512; i++)
		WrNFDat(buf[i]);
		
	tmp[0] = rNFECC0;
    tmp[1] = rNFECC1;
    tmp[2] = rNFECC2;
    	
	WrNFDat(tmp[0]);
	WrNFDat(tmp[1]);
	WrNFDat(tmp[2]);
    	
	WrNFCmd(PROGCMD1);
	stat = WaitNFBusy();
	NFChipDs();

		
	if(stat)
		Uart_Printf("Write nand flash 0x%x fail\n", addr);
	else {	
		U8 RdDat[512];
		
		ReadPage(addr, RdDat);		
		for(i=0; i<512; i++)
			if(RdDat[i]!=buf[i]) {
				Uart_Printf("Check data at page 0x%x, offset 0x%x fail\n", addr, i);
				stat = 1;
				break;
			}
	}
		
	return stat;	
}

static void MarkBadBlk(U32 addr)
{
	addr &= ~0x1f;
	
	NFChipEn();
	
	WrNFCmd(READCMD2);	//point to area c
	
	WrNFCmd(PROGCMD0);
	WrNFAddr(4);		//mark offset 4,5,6,7
	WrNFAddr(addr);
	WrNFAddr(addr>>8);
	WrNFAddr(addr>>16);
	WrNFDat(0);			//mark with 0
	WrNFDat(0);
	WrNFDat(0);			//mark with 0
	WrNFDat(0);
	WrNFCmd(PROGCMD1);
	WaitNFBusy();		//needn't check return status
	
	WrNFCmd(READCMD0);	//point to area a
		
	NFChipDs();
}

static int CheckBadBlk(U32 addr)
{
	U8 dat;
	
	addr &= ~0x1f;
	
	NFChipEn();
	
	WrNFCmd(READCMD2);	//point to area c
	WrNFAddr(5);		//mark offset 4,5,6,7
	WrNFAddr(addr);
	WrNFAddr(addr>>8);
	WrNFAddr(addr>>16);
	WaitNFBusy();
	dat = RdNFDat();
	
	WrNFCmd(READCMD0);	//point to area a
	
	NFChipDs();

	return (dat!=0xff);
}