/*  * 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: 2002/08/14 10:26:47 $ * * $Revision: 1.6 $ * $Id: param.c,v 1.9 2002/07/11 06:17:20 nandy Exp  * * History * * 2002-05-xx: Hwang, Chideok <hwang@mizi.com> *    - 瞪芭扼絆 抄叼俊霸 淋. * * 2002-05-xx: Chan Gyun Jeong <cgjeong@mizi.com> *    - 抄叼狼 何毆闌 罐絆 力措肺 悼累竅檔廢 薦瀝. * * 2002-08-10: Yong-iL Joh <tolkien@mizi.com> *    - SECTOR_SIZE啊 512牢 仇籃 促 佬檔廢 薦瀝 * */#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 NFCMD		__REGb(NF_BASE + 0x4)#define NFADDR		__REGb(NF_BASE + 0x8)#define NFDATA		__REGb(NF_BASE + 0xc)#define NFSTAT		__REGb(NF_BASE + 0x10)#define BUSY 1inline void wait_idle(void) {    int i;    while(!(NFSTAT & BUSY))      for(i=0; i<10; i++);}#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 */    }    /* chip Enable */    NFCONF &= ~0x800;    for(i=0; i<10; i++);    for(i=start_addr; i < (start_addr + size);) {      /* READ0 */      NFCMD = 0;      /* Write Address */      NFADDR = i & 0xff;      NFADDR = (i >> 9) & 0xff;      NFADDR = (i >> 17) & 0xff;      NFADDR = (i >> 25) & 0xff;      wait_idle();      for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {	*buf = (NFDATA & 0xff);	buf++;      }    }    /* chip Disable */    NFCONF |= 0x800;	/* chip disable */    return 0;}