init.c

基于dragon_MX1_ads的装载启动代码armboot

#include "../Include/type.h"
#include "../Include/mx1.h"

// To set the iA bit and the nF bit of CP15 register 1.
void SetAsynchMode(void)
{
	__asm__(
    	"mrc p15,0,r0,c1,c0,0\n\t"
    	"mov r2, #0xC0000000\n\t"
    	"orr r0,r2,r0\n\t"
    	"mcr p15,0,r0,c1,c0,0\n\t"
	);
}

void init()
{
	U32 dummy;


	// IO pad driving strength
	_reg_SYS_GPCR = 0x000003AB;
	
	// Sync-flash initialization
	dummy = _reg_SDRC_SDCTL1;       // read control register
	_reg_SDRC_SDCTL1 = 0x81020300;  // set normal mode
	_reg_SDRC_SDCTL1 = 0xB1020300;  // set load mode register
	dummy = *((U32 *)0x0C08CC00);   // special read to FLASH
	_reg_SDRC_SDCTL1 = 0x91020300;  // set pre-charge mode
	dummy = *((U32 *)0x0C100000);   // special read to FLASH
	_reg_SDRC_SDCTL1 = 0x81020300;  // set normal mode
	
	// SRAM initialization
	_reg_CS1_CTRLH = 0x00000A00;
	_reg_CS1_CTRLL = 0x11110601;

	// set FCLK to 150 MHz, BCLK to 48 MHz
	_reg_CCM_CSCR = 0xAF008403;
	// Set PD=0, MFD=99, MFI=6, MFN=10 150M
	_reg_CCM_MPCTL0 = 0x04632410;
	// Trigger the restart bit(bit 21)
	_reg_CCM_CSCR |= 0x00200000;
	// Program PRESC bit(bit 15) to 0 to divide-by-1
	_reg_CCM_CSCR &= 0xFFFF7FFF;
	SetAsynchMode();

	// all sources selected as normal interrupt
	_reg_AITC_INTTYPEH = 0;
	_reg_AITC_INTTYPEL = 0;
    
	// set PERCLKs
	dummy = _reg_CCM_PCDR;
	dummy &= ~0x000000FF;
	dummy |= 0x00000055;
	_reg_CCM_PCDR = dummy;	
	// PERCLK3 is only used by SSI so the SSI driver can set it any value it likes
	// PERCLK1 and PERCLK2 are shared so DO NOT change it in any other place	
	// all sources selected as normal interrupt
}

void cs8900MX1Init(void)
{
	volatile U16 tmp;

	// assume ext UART 20MHz max access time with no wait states
	// set up wait state of CS4
	//_reg_CS4_CTRLL |= 0x00001B01;	// Data port sized is D[7:0], EBC set	
	//_reg_CS4_CTRLH |= 0x00000500;	// if HCLK(BCLK) is 96MHz, add 5 wait states

	// set up the GPIO muxing to use Chip Select 4
	//_reg_PTA_GIUS &= 0xFF3FFFFF;
	//_reg_PTA_GPR  &= 0xFF3FFFFF;

	*(volatile P_U32)(0x00220020)  = 0x00000F00;
	*(volatile P_U32)(0x00220024)  = 0x00001501;
	
	*(volatile P_U32)(0x0021C020) &= 0xFF3FFFFF;
	*(volatile P_U32)(0x0021C038) &= 0xFF3FFFFF;
	
	tmp = *(P_U16)(0x1500000C);
}