sh7615timer.c

IXP425的BSP代码

/* sh7615Timer.c - template timer library */

/* Copyright 1984-2001 Wind River Systems, Inc. */

/*
modification history
--------------------
01g,21feb02,h_k  fixed timestamp interrupt enable (SPR #73506).
                 removed sysTimestampPeriodValue to avoid compile warning.
01f,02nov01,zl   corrected NULL usage.
01e,06oct00,zl   corrected vectors for AUX and timestamp drivers.
01d,16sep00,zl   timestamp to use maximum period.
01c,30aug00,zl   fixed INTC_IPRD modification.
01b,20aug00,csi  added AUX clock and timestamp.
01a,11aug00,zl   written.
*/


/*
DESCRIPTION
This library contains routines to manipulate the timer functions on the
SH7615 on-chip timer unit (TPU) with a board-independant interface.
This library handles the system clock, auxiliary clock, and timestamp
timer facilities.

The macros SYS_CLK_RATE_MIN, SYS_CLK_RATE_MAX, AUX_CLK_RATE_MIN, and
AUX_CLK_RATE_MAX must be defined to provide parameter checking for the
sys[Aux]ClkRateSet() routines.

To include the timestamp timer facility, the macro INCLUDE_TIMESTAMP must be
defined.  The macro TIMESTAMP_LEVEL must be defined to provide the timestamp
timer's interrupt level.

INCLUDES:
timestampDev.h
*/

/* includes */

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


/* select tick frequency */

#define TICK_FREQ	(SYS_PCLK_FREQ / 64)
#define TCR_DIVIDE	TCR_DIV64

/* The default is to assume memory mapped I/O */

#ifndef SH7615TPU_READ
#define SH7615TPU_READ(reg, result) \
	((result) = *(reg))
#endif /* SH7615TPU_READ */

#ifndef SH7615TPU_WRITE
#define SH7615TPU_WRITE(reg, data) \
	(*(reg) = (data))
#endif /* SH7615TPU_WRITE */

#ifndef SH7615TPU_SET
#define SH7615TPU_SET(reg, data) \
	(*(reg) |= (data))
#endif /* SH7615TPU_SET */

#ifndef SH7615TPU_CLEAR
#define SH7615TPU_CLEAR(reg, data) \
	(*(reg) &= ~(data))
#endif /* SH7615TPU_CLEAR */


/* locals */

LOCAL FUNCPTR sysClkRoutine	= NULL; /* routine to call on clock tick */
LOCAL int sysClkArg		= 0; /* its argument */
LOCAL int sysClkRunning		= FALSE;
LOCAL int sysClkTicksPerSecond	= 60;

LOCAL FUNCPTR sysAuxClkRoutine	= NULL;
LOCAL int sysAuxClkArg		= 0;
LOCAL int sysAuxClkRunning	= FALSE;
LOCAL int sysAuxClkTicksPerSecond = 100;

#ifdef INCLUDE_TIMESTAMP

LOCAL BOOL	sysTimestampRunning	= FALSE; /* running flag */
LOCAL FUNCPTR	sysTimestampRoutine	= NULL;  /* routine to call on intr */
LOCAL int	sysTimestampArg		= 0;     /* arg for routine */
      void	sysTimestampInt (void);		 /* forward declaration */

#endif  /* INCLUDE_TIMESTAMP */


/*******************************************************************************
*
* 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)
    {
    UINT8 value;

    if (SH7615TPU_READ (TPU_TSR0, value), (value & TSR_TGFA) == TSR_TGFA)
	{
	/* clear the interrupt */

	SH7615TPU_WRITE (TPU_TSR0, (value & ~TSR_TGFA));
	
	/* call system clock service routine */

	if (sysClkRoutine != NULL)
	    (* sysClkRoutine) (sysClkArg);
	}
    }


/*******************************************************************************
*
* 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 */
    )
    {
    static BOOL beenHere = FALSE;

    if (!beenHere)
	{
	beenHere = TRUE;
	sysHwInit2 ();	/* XXX for now -- needs to be in usrConfig.c */
	}

    sysClkRoutine   = NULL;
    sysClkArg	    = arg;
    sysClkRoutine   = routine;

    return (OK);
    }


/*******************************************************************************
*
* sysClkDisable - turn off system clock interrupts
*
* This routine disables system clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysClkEnable()
*/

void sysClkDisable (void)
    {
    if (sysClkRunning)
	{
	/* disable system timer interrupts */

	SH7615TPU_WRITE (TPU_TIER0, 0);

	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)
    {
    static BOOL connected = FALSE;

    if (!connected)
	{
	UINT16 tmp;

	/* Disable interrupt and clear the status register */

	SH7615TPU_WRITE (TPU_TIER0, 0);
	SH7615TPU_READ  (TPU_TSR0, tmp);
	SH7615TPU_WRITE (TPU_TSR0, 0);

	/* connect handler */

	intConnect(IV_TPU_TGI0A, sysClkInt, 0);

	/* Set system clock interrupt priority */
    
	SH7615TPU_READ  (INTC_IPRD, tmp);
	SH7615TPU_WRITE (INTC_IPRD, (tmp & 0x0fff) | (INT_LVL_SYSCLK << 12));

	sysClkRunning = FALSE;
	connected = TRUE;
	}

    if (!sysClkRunning)
	{
	/* select counter at F/64 , clear with TGRA */

	SH7615TPU_WRITE (TPU_TCR0, TCR_DIVIDE | TCR_TGRA);

	/* set period */

	SH7615TPU_WRITE (TPU_TGR0A, (TICK_FREQ / sysClkTicksPerSecond));

	/* Reset counter */

	SH7615TPU_WRITE (TPU_TCNT0, 0);

	/* enable interrupt */

	SH7615TPU_WRITE (TPU_TIER0, TIER_TGIEA);
	
	/* start counter */

	SH7615TPU_SET (TPU_TSTR, TSTR_CST0);

	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 */
    )
    {
    if (ticksPerSecond < SYS_CLK_RATE_MIN || ticksPerSecond > SYS_CLK_RATE_MAX)
	return (ERROR);

    sysClkTicksPerSecond = ticksPerSecond;

    if (sysClkRunning)
	{
	sysClkDisable ();
	sysClkEnable ();
	}

    return (OK);
    }

/*******************************************************************************
*
* sysAuxClkInt - handle an auxiliary clock interrupt
*
* This routine handles an auxiliary clock interrupt.  It acknowledges the
* interrupt and calls the routine installed by sysAuxClkConnect().
*
* RETURNS: N/A
*/

void sysAuxClkInt (void)
    {
    UINT8 value;

    /* acknowledge the interrupt if needed */

    if (SH7615TPU_READ (TPU_TSR1, value), (value & TSR_TGFA) == TSR_TGFA)
        {
        /* clear the interrupt */

        SH7615TPU_WRITE (TPU_TSR1, (value & ~TSR_TGFA));

        /* call auxiliary clock service routine */

        if (sysAuxClkRoutine != NULL)
	    (*sysAuxClkRoutine) (sysAuxClkArg);
        }
    }

/*******************************************************************************
*
* sysAuxClkConnect - connect a routine to the auxiliary clock interrupt
*
* This routine specifies the interrupt service routine to be called at each
* auxiliary clock interrupt.  It does not enable auxiliary clock interrupts.
*
* RETURNS: OK, or ERROR if the routine cannot be connected to the interrupt.
*
* SEE ALSO: intConnect(), sysAuxClkEnable()
*/

STATUS sysAuxClkConnect
    (
    FUNCPTR routine,    /* routine called at each aux clock interrupt */
    int arg             /* argument to auxiliary clock interrupt routine */
    )
    {
    sysAuxClkRoutine	= NULL;
    sysAuxClkArg	= arg;
    sysAuxClkRoutine	= routine;

    return (OK);
    }

/*******************************************************************************
*
* sysAuxClkDisable - turn off auxiliary clock interrupts
*
* This routine disables auxiliary clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkEnable()
*/