gpt.c

最近在國外網站抓到的作業系統 以Arm為基礎去開發的

/************************************************************************
* MODIFICATION HISTORY
*        2002/3/13        Pessia       Delete unwanted prototypes of functions
************************************************************************/
#include "M68328.h"
#include <string.h>
#include "hardware.h"

#define IRQ_NR	255
#define TIMER_IRQ_NR 64

/* Prototype of  Static Functions */
void boot(void);
void dummy(void);
void zero_div(void);
void addr_exp(void);
void ENT_INT_GPT(void);

/* Prototype of  Extern Functions */
extern void sys_clk( void );
extern void ret_int( void );
extern void int_rtc( void );
extern void int_key( void );
//extern void int_touch_panel( void );
//extern void int_rtc_and_uart( void );
extern void PWM_isr(void);
//extern void key_isr( void );


/* functions for init */
extern void main( void );

/*******************************************************************************
 * dummy
 *   Type :	void
 *   Ret val :	none
 *   Argument :	void
 *   Function :	Dummy interrupt program.
 *******************************************************************************/
void dummy(void)
{
INT_LOOP:
	goto	INT_LOOP;
}

void zero_div(void)
{
INT_LOOP:
	goto	INT_LOOP;
}

void addr_exp(void)
{
INT_LOOP:
	goto	INT_LOOP;
}

static void timer_isr( void )
{
	volatile U32 clear_int;
	
	
	sys_clk();
	
#ifdef GIII	
	if ( (read_reg(GPT1_STAT) & 0x1)  == 1)     //camparement interrupt
		write_reg(GPT1_STAT, 1);	//clear the comp int	
#else
	if(*(RP)(GPT1_MSR) & 0x01)
		clear_int = *(RP)(GPT1_SCR);
#endif
}

/*
  * System Timer Interrupt & Audio Interrupt:
  */
void ENT_INT_GPT( void )
{
	ent_int();

	mask_irq(INT_GPT);
	//ENABLE_INT;
	
	timer_isr();
	
	//DISABLE_INT;
	unmask_irq(INT_GPT);

	ret_int();
}

#if 0
void int_key( void )
{
	EXTEND_PSR_TO_32;
	PUSH_ALL_COMM_REG;
	ent_int();
	
	key_isr();
	
	ret_int();
}
#endif		//gfd

void int_control_ini( void )
{
	IVR = 0x40;
	
}

void timer_ini( void )
{
#ifdef GIII
     *(RP)GPT1_CNTL = 0X007;     //0-select gpt
                                                                //;0-disable software reset
                                                                //;0-restar mode
                                                                //;11-cancel catch the rising edge and falling edge and send a int signal function
                                                                //;0-comparament irq disable
                                                        		//;01-sysclk/16 to prescaler
                                                                //;1-gpt disable

	*(RP)GPT1_SCAL = 0X07;      //set prescaler regment

	*(RP)GPT1_COMP = 0X186a0;               ////set count value,10ms ,70MHZ
	
	*(RP)GPT1_CNTL = 0X17;     //interrupt enable
#else
	*(RP)GPT1_LCR = 0xAAE60*5/7;			//10ms under 70MHz
	
	*(RP)GPT1_CR = 0x03;					//normal work and interrupt enable
#endif
	unmask_irq(INT_GPT);

	return;
}