#include <s3c2410.h>#include <init.h>#include <mmu.h>/* SDRAM 13個(gè)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				0x008e04f4,		//REFRESH,HCLK=12MHz:0x008e07a3,HCLK=100MHz:0x008e04f4				0x000000b2,		//BANKSIZE				0x00000030,		//MRSRB6				0x00000030,		//MRSRB7};/*上電后，WATCH DOG默認(rèn)是開(kāi)著的，要把它關(guān)掉 */void disable_watch_dog(void){	WTCON	= 0;}/**************************************************************************   * 設(shè)置控制SDRAM的13個(gè)寄存器* 含有數(shù)組的代碼，不是位置無(wú)關(guān)的，所以memsetup只能在連接位置執(zhí)行* 如果要使用位置無(wú)關(guān)代碼，請(qǐng)使用memsetup_2**************************************************************************/   void memsetup(void){	int 	i = 0;	unsigned long *p = (unsigned long *)MEM_CTL_BASE;	for(; i < 13; i++)		p[i] = mem_cfg_val[i];}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] = 0x008e04f4;		//REFRESH,HCLK=12MHz:0x008e07a3,HCLK=100MHz:0x008e04f4							p[10] = 0x000000b2;		//BANKSIZE	p[11] = 0x00000030;		//MRSRB6	p[12] = 0x00000030;		//MRSRB7}/* 在第一次實(shí)用NAND Flash前，復(fù)位一下NAND Flash */void reset_nand(void){	int i=0;	NFCONF &= ~0x800;	for(; i<10; i++);	NFCMD = 0xff;	//reset command	wait_idle();}/* 初始化NAND Flash */void init_nand(void){	NFCONF = 0xf830;	reset_nand();}/**************************************************************************	以下讀NAND Flash的代碼來(lái)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 ;}/**************************************************************************** 中斷向量起始虛擬地址為0xffff0000，段是1M對(duì)齊的，所以0xfff00000虛擬地址對(duì)應(yīng)* 0x33f00000(VECTORS_PHY_BASE),而虛擬地址0xffff0000則對(duì)應(yīng)0x33f00000+0xf0000***************************************************************************/void copy_vectors_from_nand_to_sdram(void){	nand_read_ll((unsigned char*)(VECTORS_PHY_BASE+0xf0000), 0x0, 512);	}void copy_process_from_nand_to_sdram(void){	nand_read_ll((unsigned char*)PROCESS0_BASE, 0x0, 0x100000-16*1024);//進(jìn)程0空間為1M-16K頁(yè)表//	nand_read_ll((unsigned char*)(0x30100000), 15*1024, 1024);//	nand_read_ll((unsigned char*)PROCESS2_BASE, 0x8000, 1024);	}#define EINT1		(2<<(1*2))#define EINT2		(2<<(2*2))#define EINT3		(2<<(3*2))#define EINT7		(2<<(7*2))void init_irq(void){//	GPFCON |= EINT1 | EINT2 | EINT3 | EINT7;//	GPFUP	 |= (1<<1) | (1<<2) | (1<<3) | (1<<7);	//	EINTMASK &= (~0x80);	//EINT7使能//	INTMSK	&= (~0x1e);	//EINT1-3、EINT7使能		INTMSK &= (~(1<<10));	//INT_TIMER0使能	//	PRIORITY &= (~0x03);	//設(shè)定優(yōu)先級(jí)}#define MPLL_200MHz	(0x5c << 12)|(0x04 << 4)|(0x00)/**************************************************************************** 對(duì)于MPLLCON寄存器，[19:12]為MDIV，[9:4]為PDIV，[1:0]為SDIV* 有如下計(jì)算公式：*	MPLL(FCLK) = (m * Fin)/(p * 2^s)*	其中: m = MDIV + 8, p = PDIV + 2* 對(duì)于本開(kāi)發(fā)板，F(xiàn)in = 12MHz,MPLLCON設(shè)為MPLL_200MHz，可以計(jì)算出FCLK=200MHz***************************************************************************/void clock_init(void){	LOCKTIME = 0x00ffffff;	CLKDIVN  = 0x03;	/*FCLK:HCLK:PCLK=1:2:4, HDIVN1=0,HDIVN=1,PDIVN=1 */	/*If HDIVN = 1,the CPU bus mode has to be changed from the fast bus mode	  to the asynchronous bus mod using following instructions.*/__asm__(	"mrc	p15, 0, r1, c1, c0, 0\n"		/* read ctrl register   */ 	"orr	r1, r1, #0xc0000000\n"		/* Asynchronous         */	"mcr	p15, 0, r1, c1, c0, 0\n"		/* write ctrl register  */	);	 MPLLCON = MPLL_200MHz;	/*現(xiàn)在，F(xiàn)CLK=200MHz,HCLK=100MHz,PCLK=50MHz*/	 }/************************************************************************** Timer input clock Frequency = PCLK / {prescaler value+1} / {divider value}* {prescaler value} = 0~255* {divider value} = 2, 4, 8, 16* 本實(shí)驗(yàn)的Timer0的時(shí)鐘頻率=50MHz/(49+1)/(16)=62500Hz* 設(shè)置Timer0 10ms觸發(fā)一次中斷：TCNTB0[15:0]=625*************************************************************************/void Timer0_init(void){	TCFG0 = 49;		//Prescaler0 = 49	  	 	TCFG1 = 0x03;	//Select MUX input for PWM Timer0:divider=16//	TCNTB0 = 62; 	//1ms觸發(fā)一次中斷	TCNTB0 = 625;	//10ms觸發(fā)一次中斷//	TCNTB0 = 62500;	//1s觸發(fā)一次中斷,用于調(diào)試		TCON |=  (1<<1);	//Timer 0 manual update	TCON = 0x09;	/*Timer 0 auto reload on			  Timer 0 output inverter off			  清"Timer 0 manual update"			  Timer 0 start */}