s3c2410xtimer.c

sumsung 公司arm9控制器S3c2410x的BSP.

/* s3c2410xTimer.c - s3c2410x timer library */

/* Copyright 2004 HITSAT, Inc. */

/*
DESCRIPTION

This driver provides 3 main functions:
	system clock support;
	timestamp timer support.

If necessary, each function may be conditioned by a separate INCLUDE_ macro.
The timestamp function is always conditional upon the INCLUDE_TIMESTAMP macro.

The macros:
	SYS_CLK_RATE_MIN;
	SYS_CLK_RATE_MAX;
Must be defined to provide parameter checking for the sys[Aux]ClkRateSet() routines.

*/

/* includes */

#include "vxWorks.h"
#include "config.h"
#include "drv/timer/timerDev.h"
#include "drv/timer/timestampDev.h"

/* defines */
#undef SYS_CLK_RATE_MIN
#undef SYS_CLK_RATE_MAX

#define SYS_CLK_RATE_MIN 1
#define SYS_CLK_RATE_MAX 12000

#undef AUX_CLK_RATE_MAX
#undef AUX_CLK_RATE_MIN
#undef INCLUDE_AUX_CLK

#define INCLUDE_AUX_CLK
#define AUX_CLK_RATE_MIN 1
#define AUX_CLK_RATE_MAX 12000

/* The default is to assume memory mapped I/O */
#ifndef s3c2410x_IO_READ
	#define s3c2410x_IO_READ(reg,result) ((result)=*(volatile UINT32 *)(reg))
#endif

#ifndef s3c2410x_IO_WRITE
	#define s3c2410x_IO_WRITE(reg, data) (*((volatile UINT32 *)(reg))=(data))
#endif


/* locals */
LOCAL FUNCPTR sysClkRoutine	= NULL; /* routine to call on clock tick */
LOCAL int sysClkArg		= (int)NULL; /* its argument */
LOCAL BOOL sysClkRunning	= FALSE;
LOCAL int sysClkConnected      = FALSE;
LOCAL int sysClkTicksPerSecond	= 10000;

LOCAL FUNCPTR sysAuxClkRoutine	= NULL;
LOCAL int sysAuxClkArg		= 0;
LOCAL BOOL sysAuxClkRunning	= FALSE;
LOCAL int sysAuxClkConnected      = FALSE;
LOCAL int sysAuxClkTicksPerSecond = 10000;


IMPORT STATUS	s3c2410xIntLvlVecChk (int*, int*);
IMPORT STATUS	s3c2410xIntLvlEnable (int);
IMPORT STATUS	s3c2410xIntLvlDisable (int);

/*
 * sysClkInt - interrupt level processing for system clock
 *
 * This routine handles an auxiliary clock interrupt.  It acknowledges the
 * interrupt and calls the routine installed by sysClkConnect().
 */
void sysClkInt (void)
{
	/* call system clock service routine */
	if(sysClkRoutine != NULL) 
	{
		(*sysClkRoutine)(sysClkArg);
	}

	/* clear the srcpend of sysclk, and enable this level. */
	/* s3c2410x_INT_REG_WRITE(s3c2410x_INT_CSR_SRCPND, 1<<SYS_TIMER_INT_LVL); 
	s3c2410xIntLvlEnable(SYS_TIMER_INT_LVL);*/

	return;
}

/*
 * sysClkConnect - connect a routine to the system clock interrupt
 *
 * This routine specifies the interrupt service routine to be called at each
 * clock interrupt.  Normally, it is called from usrRoot() in usrConfig.c to 
 * connect usrClock() to the system clock interrupt.
 *
 * RETURN: OK, or ERROR if the routine cannot be connected to the interrupt.
 *
 * SEE ALSO: intConnect(), usrClock(), sysClkEnable()
 */
STATUS sysClkConnect
	(
		FUNCPTR routine,	/* routine to be called at each clock interrupt */
		int arg			/* argument with which to call routine */
	)
{
	if(sysClkConnected == FALSE)
	{
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCFG0), TCFG0_INIT_VALUE);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCFG1), TCFG1_INIT_VALUE);

		sysHwInit2();
		sysClkConnected = TRUE;
	}
	
	sysClkRoutine	= NULL;
	sysClkArg	= arg;
#if ((CPU_FAMILY == ARM) && ARM_THUMB)
	/* set b0 so that sysClkConnect() can be used from shell */
	sysClkRoutine = (FUNCPTR)((UINT32)routine | 1);
#else
	sysClkRoutine = routine;
#endif /* CPU_FAMILY == ARM */

	return (OK);
}

/*
 * sysClkDisable - turn off system clock interrupts
 *
 * This routine disables system clock interrupts.
 *
 * RETURNS: N/A
 *
 * SEE ALSO: sysClkEnable()
 */
void sysClkDisable (void)
{
	UINT32 tempUINT32;
	if(sysClkRunning)
	{
		/* Disable system timer interrupts */
		s3c2410xIntLvlDisable(SYS_TIMER_INT_LVL);

		/* Stop timer0 */
		s3c2410x_IO_READ((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);
		tempUINT32 &= ~(BIT_SYS_TIMER_EN);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);

		sysClkRunning = FALSE;
	}
}

/*
 * sysClkEnable - turn on system clock interrupts
 *
 * This routine enables system clock interrupts.
 *
 * RETURNS: N/A
 *
 * SEE ALSO: sysClkConnect(), sysClkDisable(), sysClkRateSet()
 */
void sysClkEnable (void)
{
	UINT32 tempUINT32;
	static BOOL connected = FALSE;

	if(!connected)
	{
		/* TODO - connect sysClkInt to appropriate interrupt */
		sysClkInt();

		connected = TRUE;
	}

	if(!sysClkRunning)
	{
		/* 12207 = PCLK/(255*16); */
		s3c2410x_IO_WRITE((SYS_TIMER_BASE+OFFSET_TCNTB), ((s3c2410x_PCLK/(2*250))/sysClkTicksPerSecond));
		s3c2410x_IO_WRITE((SYS_TIMER_BASE+OFFSET_TCMPB), ((s3c2410x_PCLK/(2*250))/(sysClkTicksPerSecond*2)));

		/* Set manual update bit and reload bit, clear enable bit. */
		s3c2410x_IO_READ((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);
		tempUINT32 |= BIT_SYS_TIMER_MU;
		tempUINT32 &= ~(BIT_SYS_TIMER_EN|BIT_SYS_TIMER_RE);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);

		/* Set enable bit and reload bit, clear manual update bit. */
		s3c2410x_IO_READ((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);
		tempUINT32 &= ~(BIT_SYS_TIMER_MU);
		tempUINT32 |= (BIT_SYS_TIMER_EN|BIT_SYS_TIMER_RE);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);

		/* Enable interrupt for system timer. */
		s3c2410xIntLvlEnable(SYS_TIMER_INT_LVL);

		sysClkRunning = TRUE;
	}
}


/*
 * sysClkRateGet - get the system clock rate
 *
 * This routine returns the system clock rate.
 *
 * RETURNS: The number of ticks per second of the system clock.
 *
 * SEE ALSO: sysClkEnable(), sysClkRateSet()
 */
int sysClkRateGet (void)
{
	return sysClkTicksPerSecond;
}

/*
 * sysClkRateSet - set the system clock rate
 *
 * This routine sets the interrupt rate of the system clock.
 * It is called by usrRoot() in usrConfig.c.
 *
 * RETURNS: OK, or ERROR if the tick rate is invalid or the timer cannot be set.
 *
 * SEE ALSO: sysClkEnable(), sysClkRateGet()
 */
STATUS sysClkRateSet
	(
		int ticksPerSecond	    /* number of clock interrupts per second */
	)
{
	/* TODO - return ERROR if rate is not supported */
	if((ticksPerSecond > SYS_CLK_RATE_MAX) ||(ticksPerSecond < SYS_CLK_RATE_MIN))
	{
		return ERROR;
	}
	else
	{
		sysClkTicksPerSecond = ticksPerSecond;

		if(sysClkRunning)
		{
			sysClkDisable();
			sysClkEnable();
		}
		return (OK);
	}
}
/*
 * sysAuxClkInt - interrupt level processing for auxiliary clock
 *
 * This routine handles an auxiliary clock interrupt.  It acknowledges the
 * interrupt and calls the routine installed by sysAuxClkConnect().
 */
void sysAuxClkInt (void)
{
	/* call auxiliary clock service routine */
	if(sysAuxClkRoutine != NULL) 
	{
		(*sysAuxClkRoutine)(sysAuxClkArg);
	}

	/* clear the srcpend of auxclk, and enable this level. */
	s3c2410x_INT_REG_WRITE(s3c2410x_INT_CSR_SRCPND, 1<<AUX_TIMER_INT_LVL);
	s3c2410xIntLvlEnable(AUX_TIMER_INT_LVL);

	return;
}

/*
 * sysAuxClkConnect - connect a routine to the auxiliary clock interrupt
 *
 * This routine specifies the interrupt service routine to be called at each
 * clock interrupt.  Normally, it is called from usrRoot() in usrConfig.c to 
 * connect usrClock() to the auxiliary clock interrupt.
 *
 * RETURN: OK, or ERROR if the routine cannot be connected to the interrupt.
 *
 * SEE ALSO: intConnect(), usrClock(), sysClkEnable()
 */
STATUS sysAuxClkConnect
	(
		FUNCPTR routine,	/* routine to be called at each clock interrupt */
		int arg			/* argument with which to call routine */
	)
{
	if(sysAuxClkConnected == FALSE)
	{
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCFG0), TCFG0_INIT_VALUE);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCFG1), TCFG1_INIT_VALUE);

		sysHwInit2();
		sysAuxClkConnected = TRUE;
	}
	
	sysAuxClkRoutine	= NULL;
	sysAuxClkArg	= arg;
#if ((CPU_FAMILY == ARM) && ARM_THUMB)
	/* set b0 so that sysClkConnect() can be used from shell */
	sysAuxClkRoutine = (FUNCPTR)((UINT32)routine | 1);
#else
	sysAuxClkRoutine = routine;
#endif /* CPU_FAMILY == ARM */

	return (OK);
}

/*
 * sysClkDisable - turn off system clock interrupts
 *
 * This routine disables system clock interrupts.
 *
 * RETURNS: N/A
 *
 * SEE ALSO: sysClkEnable()
 */
void sysAuxClkDisable(void)
{
	UINT32 tempUINT32;
	if(sysAuxClkRunning)
	{
		/* Disable system timer interrupts */
		s3c2410xIntLvlDisable(AUX_TIMER_INT_LVL);

		/* Stop timer0 */
		s3c2410x_IO_READ((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);
		tempUINT32 &= ~(BIT_AUX_TIMER_EN);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);

		sysAuxClkRunning = FALSE;
	}
}

/*
 * sysClkEnable - turn on system clock interrupts
 *
 * This routine enables system clock interrupts.
 *
 * RETURNS: N/A
 *
 * SEE ALSO: sysClkConnect(), sysClkDisable(), sysClkRateSet()
 */
void sysAuxClkEnable(void)
{
	UINT32 tempUINT32;
	static BOOL connected = FALSE;

	if(!connected)
	{
		intConnect(INUM_TO_IVEC(AUX_TIMER_INT_VEC), sysAuxClkInt, 0);

		connected = TRUE;
	}

	if(!sysAuxClkRunning)
	{
		/* 12207 = PCLK/(255*16); */
		s3c2410x_IO_WRITE((AUX_TIMER_BASE+OFFSET_TCNTB), ((s3c2410x_PCLK/(2*250))/sysAuxClkTicksPerSecond));
		s3c2410x_IO_WRITE((AUX_TIMER_BASE+OFFSET_TCMPB), ((s3c2410x_PCLK/(2*250))/(sysAuxClkTicksPerSecond*2)));

		/* Set manual update bit and reload bit, clear enable bit. */
		s3c2410x_IO_READ((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);
		tempUINT32 |= BIT_AUX_TIMER_MU;
		tempUINT32 &= ~(BIT_AUX_TIMER_EN|BIT_AUX_TIMER_RE);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);

		/* Set enable bit and reload bit, clear manual update bit. */
		s3c2410x_IO_READ((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);
		tempUINT32 &= ~(BIT_AUX_TIMER_MU);
		tempUINT32 |= (BIT_AUX_TIMER_EN|BIT_AUX_TIMER_RE);
		s3c2410x_IO_WRITE((MASTER_TIMER_BASE+OFFSET_TCON), tempUINT32);

		/* Enable interrupt for system timer. */
		s3c2410xIntLvlEnable(AUX_TIMER_INT_LVL);

		sysAuxClkRunning = TRUE;
	}
}


/*
 * sysClkRateGet - get the system clock rate
 *
 * This routine returns the system clock rate.
 *
 * RETURNS: The number of ticks per second of the system clock.
 *
 * SEE ALSO: sysClkEnable(), sysClkRateSet()
 */
int sysAuxClkRateGet (void)
{
	return sysAuxClkTicksPerSecond;
}

/*
 * sysClkRateSet - set the system clock rate
 *
 * This routine sets the interrupt rate of the system clock.
 * It is called by usrRoot() in usrConfig.c.
 *
 * RETURNS: OK, or ERROR if the tick rate is invalid or the timer cannot be set.
 *
 * SEE ALSO: sysClkEnable(), sysClkRateGet()
 */
STATUS sysAuxClkRateSet
	(
		int ticksPerSecond	    /* number of clock interrupts per second */
	)
{
	/* TODO - return ERROR if rate is not supported */
	if((ticksPerSecond > AUX_CLK_RATE_MAX) ||(ticksPerSecond < AUX_CLK_RATE_MIN))
	{
		return ERROR;
	}
	else
	{
		sysAuxClkTicksPerSecond = ticksPerSecond;

		if(sysAuxClkRunning)
		{
			sysAuxClkDisable();
			sysAuxClkEnable();
		}
		return (OK);
	}
}