ixdp2400timer.c

ixp2400 bsp for vxworks

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

    sysAuxClkRoutine   = routine;
    sysAuxClkArg   = arg;

    if (!sysAuxClkConnected )
	{
			
	intConnect (INUM_TO_IVEC (AUX_TIMER_INT_LVL), sysAuxClkInt, 0);
	sysAuxClkConnected  = TRUE;
	}

   	return (OK);
    }

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

void sysAuxClkDisable (void)
    {
     FAST int locKey;
	 volatile unsigned dummy;
    
     if (sysAuxClkRunning)
     {
    /* Lock Interrupts */
     locKey = intLock();

     /* disable auxiliary timer interrupts at the interrupt contrl*/
     IXP2400_REG_WRITE(IXP2400_IRQ_ENABLE_CLR_REG, IXP2400_INT_VEC_T3 );
			
	/*de-activate the timer itself*/
	 IXP2400_REG_WRITE(IXP2400_TIMER3_CONTROL, 0x0 );
	 /* read back to make sure that write is completed */
	 IXP2400_REG_READ(IXP2400_TIMER3_CONTROL, dummy);
            
     /* UnLock Interrupts */
      intUnlock (locKey);
	  sysAuxClkRunning = FALSE;
      }
      }

/*******************************************************************************
*
* sysAuxClkEnable - turn on auxiliary clock interrupts
*
* This routine enables auxiliary clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkConnect(), sysAuxClkDisable(), sysAuxClkRateSet()
*/

void sysAuxClkEnable (void)
    {
    	
	UINT32 tc;
    FAST int locKey;
	volatile unsigned dummy;
	
   	if (!sysAuxClkRunning)
    {
	/* Lock Interrupts */
    locKey = intLock();
        
 	/* Set up timer - divide clock input by 1, enable timer */
	IXP2400_REG_WRITE(IXP2400_TIMER3_CONTROL, IXP2400_TIMER_ACTIVATE);
		
	/*
	 * Calculate the timer value
	 * Note that it may take some ticks to reload the counter
	 * so counter value = (clock rate / sysAuxClkTicksPerSecond) - num_ticks
	 */
	
#ifdef RELOAD_TICKS
     		tc = (AUX_TIMER_CLK/sysAuxClkTicksPerSecond) - IXP2400_RELOAD_TICKS;
#else
     		tc = (AUX_TIMER_CLK/sysAuxClkTicksPerSecond);
#endif
			
	/* Load Timer Reload value into Timer registers */
	IXP2400_REG_WRITE (IXP2400_TIMER3_LOAD, tc);
	/* read back to make sure that write is completed */
	IXP2400_REG_READ(IXP2400_TIMER3_LOAD, dummy);
 
    /* UnLock Interrupts */
    intUnlock (locKey);

    intEnable(AUX_TIMER_INT_LVL);
	
	sysAuxClkRunning = TRUE;
	}
    }

/*******************************************************************************
*
* sysAuxClkRateGet - get the auxiliary clock rate
*
* This routine returns the interrupt rate of the auxiliary clock.
*
* RETURNS: The number of ticks per second of the auxiliary clock.
*
* SEE ALSO: sysAuxClkEnable(), sysAuxClkRateSet()
*/

int sysAuxClkRateGet (void)
    {
    return (sysAuxClkTicksPerSecond);
    }

/*******************************************************************************
*
* sysAuxClkRateSet - set the auxiliary clock rate
*
* This routine sets the interrupt rate of the auxiliary clock.  It does not
* enable auxiliary clock interrupts.
*
* RETURNS: OK, or ERROR if the tick rate is invalid or the timer cannot be set.
*
* SEE ALSO: sysAuxClkEnable(), sysAuxClkRateGet()
*/

STATUS sysAuxClkRateSet
    (
    int ticksPerSecond  /* number of clock interrupts per second */
    )
    {
    if (ticksPerSecond < AUX_CLK_RATE_MIN || ticksPerSecond > AUX_CLK_RATE_MAX)
    return (ERROR);

	sysAuxClkTicksPerSecond = ticksPerSecond;    
	if (sysAuxClkRunning)
	{
	sysAuxClkDisable ();
	sysAuxClkEnable ();
	}

	return (OK);
   	}



#ifdef  INCLUDE_TIMESTAMP
/*******************************************************************************
*
* sysTimestampInt - timestamp timer interrupt handler
*
* This rountine handles the timestamp timer interrupt.  A user routine is
* called, if one was connected by sysTimestampConnect().time stamp usee the TIMER1
*
* RETURNS: N/A
*
* SEE ALSO: sysTimestampConnect()
*/

void sysTimestampInt (void)
    {
   	if (sysTimestampRunning && sysTimestampRoutine != NULL)
		(*sysTimestampRoutine)(sysTimestampArg);
    }

/*******************************************************************************
*
* sysTimestampConnect - connect a user routine to the timestamp timer interrupt
*
* This routine specifies the user interrupt routine to be called at each
* timestamp timer interrupt.  It does not enable the timestamp timer itself.
*
* RETURNS: OK, or ERROR if sysTimestampInt() interrupt handler is not used.
*/

STATUS sysTimestampConnect
    (
    FUNCPTR routine,    /* routine called at each timestamp timer interrupt */
    int arg     /* argument with which to call routine */
    )
    {
		/*We use the sysclock to generate the timestamp and hence there is no
		 *separate ISR for timestamp.
		 */
    	return ERROR;
    }

/*******************************************************************************
*
* sysTimestampEnable - initialize and enable the timestamp timer
*
* This routine connects the timestamp timer interrupt and initializes the
* counter registers.  If the timestamp timer is already running, this routine
* merely resets the timer counter.
*
* The rate of the timestamp timer should be set explicitly within the BSP,
* in the sysHwInit() routine.  This routine does not intialize the timer
* rate.
*
* RETURNS: OK, or ERROR if hardware cannot be enabled.
*/

STATUS sysTimestampEnable (void)
    {
   	if (!sysTimestampRunning)
	{
    	sysTimestampRunning = TRUE;
	}
   	return (OK);
    }

/*******************************************************************************
*
* sysTimestampDisable - disable the timestamp timer
*
* This routine disables the timestamp timer.  Interrupts are not disabled,
* although the tick counter will not increment after the timestamp timer
* is disabled, thus interrupts will no longer be generated.
*
* RETURNS: OK, or ERROR if timer cannot be disabled.
*/

STATUS sysTimestampDisable (void)
    {
    if (sysTimestampRunning)
      	sysTimestampRunning = FALSE;

	return (OK);
    }

/*******************************************************************************
*
* sysTimestampPeriod - get the timestamp timer period
*
* This routine returns the period of the timestamp timer in ticks.
* The period, or terminal count, is the number of ticks to which the timestamp
* timer will count before rolling over and restarting the counting process.
*
* RETURNS: The period of the timestamp timer in counter ticks.
*/

UINT32 sysTimestampPeriod (void)
    {
    	/*Since the timestamp is derived form the sysclk, 
		 *its period is dependent on the sysClk rate
		 */

  	return ((UINT32)(TIMESTAMP_HZ/sysClkTicksPerSecond));
	

    }

/*******************************************************************************
*
* sysTimestampFreq - get the timestamp timer clock frequency
*
* This routine returns the frequency of the timer clock, in ticks per second.
*
* RETURNS: The timestamp timer clock frequency, in ticks per second.
*/

UINT32 sysTimestampFreq (void)
    {
    	
   		return (TIMESTAMP_HZ);
    }

/*******************************************************************************
*
* sysTimestamp - get the timestamp timer tick count
*
* This routine returns the current value of the timestamp timer tick counter.
* The tick count can be converted to seconds by dividing by the return of
* sysTimestampFreq().
*
* This routine should be called with interrupts locked.  If interrupts are
* not already locked, sysTimestampLock() should be used instead.
*
* RETURNS: The current timestamp timer tick count.
*
* SEE ALSO: sysTimestampLock()
*/

UINT32 sysTimestamp (void)
    {
    	UINT32 count = 0;
		
    	if (sysTimestampRunning)
    	{
    	/* read the timestamp timer value which is same a sthe sysClk timer */
	IXP2400_REG_READ(IXP2400_TIMER2_STATUS, count);

        /* counts down to zero */
        count = (sysClkPeriod-count);
	}
    	return ( count); 

    }

/*******************************************************************************
*
* sysTimestampLock - get the timestamp timer tick count
*
* This routine returns the current value of the timestamp timer tick counter.
* The tick count can be converted to seconds by dividing by the return of
* sysTimestampFreq().
*
* This routine locks interrupts for cases where it is necessary to stop the
* tick counter in order to read it, or when two independent counters must
* be read.  If interrupts are already locked, sysTimestamp() should be
* used instead.
*
* RETURNS: The current timestamp timer tick count.
*
* SEE ALSO: sysTimestamp()
*/

UINT32 sysTimestampLock (void)
    {
    UINT32 result=0;
    FAST int locKey;

    if (sysTimestampRunning)
    {
    locKey = intLock ();

    /* read the timestamp timer value which is same as the sysClk timer */
    IXP2400_REG_READ(IXP2400_TIMER2_STATUS, result);

    /* counts down to zero */
    result = (sysClkPeriod-result);

    intUnlock (locKey);
    }

    return (result);
    }

#endif  /* INCLUDE_TIMESTAMP */