#include "s3c2410.h"/* SDRAM 13個寄存器的值 */unsigned long  const	mem_cfg_val[]={	0x22111110,		//BWSCON				0x00000700,		//BANKCON0				0x00000700,		//BANKCON1				0x00000700,		//BANKCON2				0x00000700,		//BANKCON3					0x00000700,		//BANKCON4				0x00000700,		//BANKCON5				0x00018005,		//BANKCON6				0x00018005,		//BANKCON7				0x008e07a3,		//REFRESH				0x000000b2,		//BANKSIZE				0x00000030,		//MRSRB6				0x00000030,		//MRSRB7				 }; void disable_watch_dog(void);void memsetup(void);void reset_nand(void);void init_nand(void);inline void wait_idle(void);void nand_read_ll(unsigned char *buf, unsigned long start_addr, int size);/*上電后，WATCH DOG默認是開著的，要把它關掉 */void disable_watch_dog(){	WTCON	= 0;}/* 設置控制SDRAM的13個寄存器 */void memsetup(){	int 	i = 0;	unsigned long *p = (unsigned long *)MEM_CTL_BASE;	for(; i < 13; i++)		p[i] = mem_cfg_val[i];}/**************************************************************************   * 設置控制SDRAM的13個寄存器* 使用位置無關代碼**************************************************************************/   void memsetup_2(void){	unsigned long *p = (unsigned long *)MEM_CTL_BASE;		p[0] = 0x22111110;		//BWSCON	p[1] = 0x00000700;		//BANKCON0	p[2] = 0x00000700;		//BANKCON1	p[3] = 0x00000700;		//BANKCON2	p[4] = 0x00000700;		//BANKCON3		p[5] = 0x00000700;		//BANKCON4	p[6] = 0x00000700;		//BANKCON5	p[7] = 0x00018005;		//BANKCON6	p[8] = 0x00018005;		//BANKCON7	p[9] = 0x008e07a3;		//REFRESH,HCLK=12MHz:0x008e07a3,HCLK=100MHz:0x008e04f4	p[10] = 0x000000b2;		//BANKSIZE	p[11] = 0x00000030;		//MRSRB6	p[12] = 0x00000030;		//MRSRB7}/* 在第一次實用NAND Flash前，復位一下NAND Flash */void reset_nand(){	int i=0;	NFCONF &= ~0x800;    	for(; i<10; i++);	NFCMD = 0xff;	//reset command	wait_idle();}/* * bit[15]:Enable Nand Flash Controller * bit[12]:Initialize ECC * bit[11]:Nand Flash nFCE = HIGH(inactive) * bit[10:8]:TACLS,Duration = HCLK*(TACLS+1) * bit[6:4]:TWRPH0,Duration = HCLK*(TWRPH0+1) * bit[2:0]:TWRPH1,Duration = HCLK*(TWRPH1+1)  *///#define	NANDCONFIGVAL	((1<<15)|(1<<12)|(1<<11)|(0x0<<8)|(0x3<<4)|(0x0))#define	NANDCONFIGVAL	((1<<15)|(1<<12)|(1<<11)|(0x7<<8)|(0x7<<4)|(0x7))/* 初始化NAND Flash */void init_nand(){	NFCONF = NANDCONFIGVAL;	reset_nand();}/**************************************************************************	以下讀NAND Flash的代碼來自mizi公司的bootloader vivi*************************************************************************/#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 */void nand_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 ;	/* 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 ;}