at91timer.c

(1)基于部分u-boot代码自己调试的vxworks BSP (2)实现了nand/nor flash的tffs文件系统 (3)实现了对spi dataflash的访问 (4)实现了对启动参数

/*******************************************************************************
*
* sysTimestampEnable - initialize and enable the timestamp timer
*
* This routine connects interrupts, and enables the timer device
*
* RETURNS: TRUE always
*/

STATUS sysTimestampEnable(void)
{
    if (!sysTimestampRunning)
    {
        AT91C_BASE_RTC->RTC_CR &= ~(AT91C_RTC_UPDTIM | AT91C_RTC_UPDCAL);
        sysTimestampRunning = TRUE;
    }

    return OK;
}

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

UINT32 sysTimestampPeriod(void)
{
    return (1);
}

/*******************************************************************************
*
* sysTimestampFreq - get a timestamp timer clock frequency
*
* This routine gets the frequency of the timer clock, in ticks per second. The
* rate of the timestamp timer is set explicitly by the hardware and typically
* cannot be altered.
*
* RETURNS: The timestamp timer clock frequency, in ticks per second.
*/

UINT32 sysTimestampFreq(void)
{
    return (1);
}

/*******************************************************************************
*
* sysTimestamp - get a 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 it by the return of
* sysTimestampFreq().
*
* This routine should be called with interrupts locked. If interrupts are not
* locked, sysTimestampLock() should be used instead.
*
* RETURNS: The current timestamp timer tick count.
*
* SEE ALSO: sysTimestampFreq(), sysTimestampLock()
*/

UINT32 sysTimestamp(void)
{
    UINT32 runtime = 0;
    return (runtime);
}

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

UINT32 sysTimestampLock(void)
{
    return (1);
}
#endif  /* INCLUDE_TIMESTAMP */


#ifdef INCLUDE_TIMER_COUNTERS

LOCAL void TimerCounter0ISR(void)
{
	/*clear the interrupt  wurj*/
	AT91PS_TC tc = at91rm9200timercounter[TIMER_COUNTER0].TCRegBaseAddr;
	/*clear the interrupt */
	if(0 == ((tc->TC_SR) & AT91C_TC_CPCS))
	{
		return;
	}
#if 0
	/*clear the interrupt*/
	AT91F_AIC_ClearIt(AT91C_BASE_AIC, INT_LVL_TC0);
#endif/*this mode not been test*/

	if (at91rm9200timercounter[TIMER_COUNTER0].TimerCounterRoutine &&
		 at91rm9200timercounter[TIMER_COUNTER0].TimerCounterRunning)
	{
	    at91rm9200timercounter[TIMER_COUNTER0].TimerCounterRoutine(at91rm9200timercounter[TIMER_COUNTER0].TimerCounterArg);
	}      
}
LOCAL void TimerCounter1ISR(void)
{   
	/*clear the interrupt*/
	AT91PS_TC tc = at91rm9200timercounter[TIMER_COUNTER1].TCRegBaseAddr;

	if(0 == ((tc->TC_SR) & AT91C_TC_CPCS))
	{
		return;
	}
	if (at91rm9200timercounter[TIMER_COUNTER1].TimerCounterRoutine &&
		 at91rm9200timercounter[TIMER_COUNTER1].TimerCounterRunning)
	{        
	    at91rm9200timercounter[TIMER_COUNTER1].TimerCounterRoutine(at91rm9200timercounter[TIMER_COUNTER1].TimerCounterArg);
	}      
}
LOCAL void TimerCounter2ISR(void)
{
	/*clear the interrupt*/
	AT91PS_TC tc = at91rm9200timercounter[TIMER_COUNTER2].TCRegBaseAddr;

	if(0 == ((tc->TC_SR) & AT91C_TC_CPCS))
	{
		return;
	}
	if (at91rm9200timercounter[TIMER_COUNTER2].TimerCounterRoutine &&
		 at91rm9200timercounter[TIMER_COUNTER2].TimerCounterRunning)
	{
	    at91rm9200timercounter[TIMER_COUNTER2].TimerCounterRoutine(at91rm9200timercounter[TIMER_COUNTER2].TimerCounterArg);
	}      
}
LOCAL void TimerCounter3ISR(void)
{
	/*clear the interrupt*/
	AT91PS_TC tc = at91rm9200timercounter[TIMER_COUNTER3].TCRegBaseAddr;

	if(0 == ((tc->TC_SR) & AT91C_TC_CPCS))
	{
		return;
	}
	if (at91rm9200timercounter[TIMER_COUNTER3].TimerCounterRoutine &&
		 at91rm9200timercounter[TIMER_COUNTER3].TimerCounterRunning)
	{
	    at91rm9200timercounter[TIMER_COUNTER3].TimerCounterRoutine(at91rm9200timercounter[TIMER_COUNTER3].TimerCounterArg);
	}      
}
LOCAL void TimerCounter4ISR(void)
{
	/*clear the interrupt*/
	AT91PS_TC tc = at91rm9200timercounter[TIMER_COUNTER4].TCRegBaseAddr;

	if(0 == ((tc->TC_SR) & AT91C_TC_CPCS))
	{
		return;
	}
	if (at91rm9200timercounter[TIMER_COUNTER4].TimerCounterRoutine &&
		 at91rm9200timercounter[TIMER_COUNTER4].TimerCounterRunning)
	{
	    at91rm9200timercounter[TIMER_COUNTER4].TimerCounterRoutine(at91rm9200timercounter[TIMER_COUNTER4].TimerCounterArg);
	}      
} 

LOCAL void TimerCounter5ISR(void)
{
	/*clear the interrupt*/
	AT91PS_TC tc = at91rm9200timercounter[TIMER_COUNTER5].TCRegBaseAddr;

	if(0 == ((tc->TC_SR) & AT91C_TC_CPCS))
	{
		return;
	}
	if (at91rm9200timercounter[TIMER_COUNTER5].TimerCounterRoutine &&
		 at91rm9200timercounter[TIMER_COUNTER5].TimerCounterRunning)
	{
	    at91rm9200timercounter[TIMER_COUNTER5].TimerCounterRoutine(at91rm9200timercounter[TIMER_COUNTER5].TimerCounterArg);
	}      
}

STATUS TimerCounterConnect(
	UINT32 timercounternum,
    FUNCPTR routine,          /* routine called at each auxiliary clock interrupt */
    int arg                   /* argument to auxiliary clock interrupt routine */
    )
{
    AT91PS_TC tc = NULL;

    if (timercounternum > 5)
	    return ERROR;	
		
    tc = at91rm9200timercounter[timercounternum].TCRegBaseAddr;
	
    if (at91rm9200timercounter[timercounternum].TimerCounterConnectFirstTime)    
    {
        /* enables TC clock */
        *AT91C_PMC_PCER = 1 << (AT91C_ID_TC0 + timercounternum);  /* enable clock */
        
        /* TC0 register init */
        tc->TC_CCR = AT91C_TC_CLKDIS;
        tc->TC_IDR = ~0ul;
        tc->TC_SR;
        
        /* TC global configuration register init */
        *AT91C_TCB0_BCR = 0;
        *AT91C_TCB0_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_NONE | AT91C_TCB_TC2XC2S_NONE;
        *AT91C_TCB1_BCR = 0;
        *AT91C_TCB1_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_NONE | AT91C_TCB_TC2XC2S_NONE;
              
        tc->TC_CMR = AT91C_TC_TIMER_DIV4_CLOCK | AT91C_TC_CPCTRG;		
        
        tc->TC_RC = AT91C_TIMER_CLOCK4/at91rm9200timercounter[timercounternum].TimerCounterTicksPerSecond;
        
        /* we enalbe the clock and use software trigget to start the clock */
        tc->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
        
        /* Connect and enable interrupt.*/ 
        intConnect(INUM_TO_IVEC(INT_LVL_TC0 + timercounternum), 
                   (VOIDFUNCPTR)at91rm9200timercounter[timercounternum].TimerCounterISR, 
                   0);
        intEnable(INT_LVL_TC0 + timercounternum);

		at91rm9200timercounter[timercounternum].TimerCounterConnectFirstTime = FALSE;
    }
	
    at91rm9200timercounter[timercounternum].TimerCounterRoutine    = routine;
    at91rm9200timercounter[timercounternum].TimerCounterArg        = arg;
	
    return OK;
}

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

STATUS TimerCounterDisable(UINT32 timercounternum)
{
    AT91PS_TC tc = NULL;

    if (timercounternum > 5)
	    return ERROR;	
		
    tc = at91rm9200timercounter[timercounternum].TCRegBaseAddr;
	
    if (at91rm9200timercounter[timercounternum].TimerCounterRunning)
    {
        tc->TC_IDR = AT91C_TC_CPCS ;        
        at91rm9200timercounter[timercounternum].TimerCounterRunning = FALSE;
    }

	return OK;
}

/*******************************************************************************
*
* sysAuxClkEnable - turn on auxiliary clock interrupts
*
* This routine enables auxiliary clock interrupts. The timer is used in
* "reference mode" i.e. a value is programmed into the reference register and an
* interrupt occurs when the timer reaches that value. 
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkConnect(), sysAuxClkDisable(), sysAuxClkRateSet()
*/

STATUS TimerCounterEnable(UINT32 timercounternum)
{
    AT91PS_TC tc = NULL;

    if (timercounternum > 5)
	    return ERROR;	
		
    tc = at91rm9200timercounter[timercounternum].TCRegBaseAddr;
	
    if (!at91rm9200timercounter[timercounternum].TimerCounterRunning)
    {
        tc->TC_CCR = AT91C_TC_SWTRG;
        tc->TC_IER = AT91C_TC_CPCS ;
		at91rm9200timercounter[timercounternum].TimerCounterRunning = TRUE;
    }

	return OK;
}

/*******************************************************************************
*
* 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 TimerCounterRateGet(UINT32 timercounternum)
{
    return (at91rm9200timercounter[timercounternum].TimerCounterTicksPerSecond);
}

/*******************************************************************************
*
* 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 TimerCounterRateSet(
    UINT32 timercounternum,
    int ticksPerSecond                                      /* number of clock interrupts per second */
    )
{
    AT91PS_TC tc = NULL;

    if (timercounternum > 5)
	    return ERROR;			
	
    if ((ticksPerSecond < TIMER_COUNTER_RATE_MIN) || (ticksPerSecond > TIMER_COUNTER_RATE_MAX))
    {
        return ERROR;
    }
	
    tc = at91rm9200timercounter[timercounternum].TCRegBaseAddr;

    at91rm9200timercounter[timercounternum].TimerCounterTicksPerSecond = ticksPerSecond;

    if (at91rm9200timercounter[timercounternum].TimerCounterRunning)
    {
        TimerCounterDisable(timercounternum);        
    }

    tc->TC_RC = AT91C_TIMER_CLOCK4/ticksPerSecond;

    TimerCounterEnable(timercounternum);

    return OK;
}

#endif /* INCLUDE_TIMER_COUNTERS */