/*  * vivi/s3c2410/nand_read.c: Simple NAND read functions for booting from NAND * * Copyright (C) 2002 MIZI Research, Inc. * * Author: Hwang, Chideok <hwang@mizi.com> * Date  : $Date: 2004/02/04 06:22:24 $ * * $Revision: 1.1.1.1 $ * $Id: param.c,v 1.9 2002/07/11 06:17:20 nandy Exp  * * History * * 2002-05-xx: Hwang, Chideok <hwang@mizi.com> * * 2002-05-xx: Chan Gyun Jeong <cgjeong@mizi.com> * * 2002-08-10: Yong-iL Joh <tolkien@mizi.com> * */#include <config.h>#define __REGb(x)	(*(volatile unsigned char *)(x))#define __REGi(x)	(*(volatile unsigned int *)(x))#define NF_BASE		0x4e000000#define NFCONF		__REGi(NF_BASE + 0x0)#define NFCONT		__REGi(NF_BASE + 0x4)#define NFCMD		__REGb(NF_BASE + 0x8)#define NFADDR		__REGb(NF_BASE + 0xC)#define NFDATA		__REGb(NF_BASE + 0x10)#define NFSTAT		__REGb(NF_BASE + 0x20)//#define GPDAT		__REGi(GPIO_CTL_BASE+oGPIO_F+oGPIO_DAT)#define NAND_CHIP_ENABLE  (NFCONT &= ~(1<<1))#define NAND_CHIP_DISABLE (NFCONT |=  (1<<1))#define NAND_CLEAR_RB	  (NFSTAT |=  (1<<2))#define NAND_DETECT_RB	  { while(! (NFSTAT&(1<<2)) );}#define BUSY 4inline void wait_idle(void) {	while(!(NFSTAT & BUSY));	NFSTAT |= BUSY;}#define NAND_SECTOR_SIZE	512#define NAND_BLOCK_MASK		(NAND_SECTOR_SIZE - 1)/* low level nand read function */intnand_read_ll(unsigned char *buf, unsigned long start_addr, int size){	int i, j;	if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {		return -1;	/* invalid alignment */	}	NAND_CHIP_ENABLE;	for(i=start_addr; i < (start_addr + size);) {		/* READ0 */		NAND_CLEAR_RB;	    		NFCMD = 0;		/* Write Address */		NFADDR = i & 0xff;		NFADDR = (i >> 9) & 0xff;		NFADDR = (i >> 17) & 0xff;		NFADDR = (i >> 25) & 0xff;		NAND_DETECT_RB;		for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {			*buf = (NFDATA & 0xff);			buf++;		}	}	NAND_CHIP_DISABLE;	return 0;}