timer_vartick.c

2443 wince5.0 bsp, source code

//
//  This function is called by the kernel when there are no threads ready to 
//  run. The CPU should be put into a reduced power mode if possible and halted. 
//  It is important to be able to resume execution quickly upon receiving an 
//  interrupt.
//
//  Interrupts are disabled when OEMIdle is called and when it returns.
//
//  Note that system timer must be running when CPU/SoC is moved to reduced
//  power mode.
//
void OEMIdle(DWORD idleParam)
{
    UINT32 baseMSec, idleMSec, idleSysTicks;
    INT32 usedCounts, idleCounts;
    ULARGE_INTEGER idle;
    // Get current system timer counter
    baseMSec = CurMSec;

    // Compute the remaining idle time
    idleMSec = dwReschedTime - baseMSec;
//	RETAILMSG(1,(TEXT("(%d)"), idleMSec));
    
    // Idle time has expired - we need to return
    if ((INT32)idleMSec <= 0) return;

	// Limit the maximum idle time to what is supported.  
	// Counter size is the limiting parameter.  When kernel 
	// profiler or interrupt latency timing is active it is set
	// to one system tick.
	if (idleMSec > g_oalTimer.maxPeriodMSec) {
		idleMSec = g_oalTimer.maxPeriodMSec;
	}

	// We can wait only full systick
	idleSysTicks = idleMSec/g_oalTimer.msecPerSysTick;

	// This is idle time in hi-res ticks
	idleCounts = idleSysTicks * g_oalTimer.countsPerSysTick;

    // Find how many hi-res ticks was already used
    usedCounts = OALTimerCountsSinceSysTick();

	if (usedCounts == g_oalTimer.countsPerSysTick)
	{
		return;
	}

    // Prolong beat period to idle time -- don't do it idle time isn't
    // longer than one system tick. Even if OALTimerExtendSysTick function
    // should accept this value it can cause problems if kernel profiler
    // or interrupt latency timing is active.
    if (idleSysTicks > 1) {
        // Extend timer period
        OALTimerUpdate(idleCounts-usedCounts, g_oalTimer.countsMargin);
        // Update value for timer interrupt which wakeup from idle
        g_oalTimer.actualMSecPerSysTick = idleMSec;
        g_oalTimer.actualCountsPerSysTick = idleCounts;
    }

	g_idleMSec = idleMSec;

    // Move SoC/CPU to idle mode
    OALCPUIdle();

    // Return system tick period back to original. Don't call when idle
    // time was one system tick. See comment above.
    if (idleSysTicks > 1) {
        // If there wasn't timer interrupt we have to update CurMSec&curCounts
        if (CurMSec == baseMSec) {
			// Return system tick period back to original
			idleCounts = OALTimerUpdate(g_oalTimer.countsPerSysTick, g_oalTimer.countsMargin)+usedCounts;

			g_idleMSec = g_oalTimer.msecPerSysTick;
//			RETAILMSG(1,(TEXT("(%x)"), idleSysTicks));

            // Restore original values
			g_oalTimer.actualMSecPerSysTick = g_oalTimer.msecPerSysTick;
			g_oalTimer.actualCountsPerSysTick = g_oalTimer.countsPerSysTick;

            // Fix system tick counters & idle counter
			CurMSec += idleCounts/g_oalTimer.countsPerMSec;
			//idleCounts = idleSysTicks * g_oalTimer.actualCountsPerSysTick;
			g_oalTimer.curCounts += idleCounts;
			idleCounts += OALTimerCountsSinceSysTick();
			usedCounts = 0;
        }
    } else {
        if (CurMSec == baseMSec) {
			// Update actual idle counts, if there wasn't timer interrupt
			idleCounts = OALTimerCountsSinceSysTick();
			usedCounts = 0;
        }
    }

    // Get real idle value. If result is negative we didn't idle at all.
    idleCounts -= usedCounts;

    if (idleCounts < 0) idleCounts = 0;

//	RETAILMSG(1,(TEXT("(%x, %x)"), idleCounts, (CurMSec - baseMSec)*g_oalTimer.countsPerSysTick));

    // Update idle counters
    idle.LowPart = curridlelow;
    idle.HighPart = curridlehigh;
    idle.QuadPart += idleCounts;
    curridlelow  = idle.LowPart;
    curridlehigh = idle.HighPart;

#ifdef DVS_EN
	dwCurrentidle = (DWORD)(idle.QuadPart/idleconv);
#endif
}


//------------------------------------------------------------------------------
//
//  Function:   OALCPUIdle
//
//  This Idle function implements a busy idle. It is intend to be used only
//  in development (when CPU doesn't support idle mode it is better to stub
//  OEMIdle function instead use this busy loop). The busy wait is cleared by
//  an interrupt from interrupt handler setting the g_oalLastSysIntr.
//
//
extern void Nop(void);
//extern void MMU_WaitForInterrupt();
VOID OALCPUIdle()
{
    volatile S3C2443_CLKPWR_REG *s2443CLKPWR = (S3C2443_CLKPWR_REG *)OALPAtoVA(S3C2443_BASE_REG_PA_CLOCK_POWER, FALSE);
    volatile S3C2443_INTR_REG *s2443INT = (S3C2443_INTR_REG *)OALPAtoVA(S3C2443_BASE_REG_PA_INTR, FALSE);
    volatile S3C2443_IOPORT_REG *s2443IOPORT = (S3C2443_IOPORT_REG *)OALPAtoVA(S3C2443_BASE_REG_PA_IOPORT, FALSE);

#ifdef DVS_EN
		volatile S3C2443_LCD_REG    *s2443LCD = (S3C2443_LCD_REG *)OALPAtoVA(S3C2443_BASE_REG_PA_LCD, FALSE);
#if(DVS_METHOD == 1)
{

	if ( CurrStateIdle == TRUE )
	{
		s2443INT->INTSUBMSK |= (1 << IRQ_SUB_LCD3);		// masking LCD3 sub interrupt					
		s2443INT->INTMSK |= (1 << IRQ_LCD);		// maksing LCD interrupt
		s2443LCD->VIDINTCON &= ~(0x1);	// disable LCD interrupt
	}
	else
	{
		s2443INT->INTSUBMSK &= ~(1 << IRQ_SUB_LCD3);		// unmasking LCD3 sub interrupt			
		s2443INT->INTMSK &= ~(1 << IRQ_LCD);		// unmasking LCD interrupt
		s2443LCD->VIDINTCON |= (0x1);	// enable LCD interrupt	
	}

	if  ( s2443INT->SUBSRCPND & (1 << IRQ_SUB_LCD3) ) s2443INT->SUBSRCPND = (1 << IRQ_SUB_LCD3);
	if  ( s2443INT->SRCPND & (1 << IRQ_LCD)) s2443INT->SRCPND = (1 << IRQ_LCD);
	if  ( s2443INT->INTPND & (1 << IRQ_LCD)) s2443INT->INTPND = (1 << IRQ_LCD);


	b_oalInterruptFlag = FALSE;
	IDLEflag = TRUE;


	#if IDLELED_ACTIVATE==TRUE
	s2443IOPORT->GPFDAT |= ( 1<< 5);    // GPF5 output data, turn LED on
	#endif
				
	s2443CLKPWR->PWRMODE |=  (1 << 17);
//	MMU_WaitForInterrupt();
	INTERRUPTS_ON();
	while (!b_oalInterruptFlag)	{}
	INTERRUPTS_OFF();
	s2443CLKPWR->PWRMODE &=  ~(1 << 17);

	
	IDLEflag = FALSE;

	#if IDLELED_ACTIVATE==TRUE
	s2443IOPORT->GPFDAT &= ~(1 << 5);    // GPF5 output data, turn LED off		
	#endif

	if ( CurrStateIdle == FALSE ){
		s2443INT->INTSUBMSK |= (1 << IRQ_SUB_LCD3);		// masking LCD3 sub interrupt					
		s2443INT->INTMSK |= (1 << IRQ_LCD);		// maksing LCD interrupt
		s2443LCD->VIDINTCON &= ~(0x1);	// disable LCD interrupt
	}
	else
	{
		s2443INT->INTSUBMSK &= ~(1 << IRQ_SUB_LCD3);		// unmasking LCD3 sub interrupt			
		s2443INT->INTMSK &= ~(1 << IRQ_LCD);		// unmasking LCD interrupt
		s2443LCD->VIDINTCON |= (0x1);	// enable LCD interrupt	
	}

	if  ( s2443INT->SUBSRCPND & (1 << IRQ_SUB_LCD3) ) 
	{
		s2443INT->SUBSRCPND = (1 << IRQ_SUB_LCD3);
	}
	if  ( s2443INT->SRCPND & (1 << IRQ_LCD))
	{	
		s2443INT->SRCPND = (1 << IRQ_LCD);
	}
	if  ( s2443INT->INTPND & (1 << IRQ_LCD))
	{
		s2443INT->INTPND = (1 << IRQ_LCD);
	}
}
#elif (DVS_METHOD == 2)
/**
 *	DVS_ON : Sync FCLK to HCLK
 *	Change voltage to lower
 *	set system mode to idle
 *	Wait for interrupt
 *	Change voltage to high
 *	Wait for recovering voltage to high
 *	DVS_OFF : restore FCLK
 */
//	RETAILMSG(1, (TEXT("I")));
	DVS_ON();		// FCLK to 133?
	g_oalIoCtlClockSpeed = S3C2443_HCLK;
	ChangeVoltage(LOWVOLTAGE);
	//g_oalLastSysIntr = FALSE;
  b_oalInterruptFlag = FALSE;



	#if IDLELED_ACTIVATE==TRUE
	s2443IOPORT->GPFDAT |= ( 1<< 5);    // GPF5 output data, turn LED on
	#endif

	s2443CLKPWR->PWRMODE |=  (1 << 17);
//	MMU_WaitForInterrupt();

	INTERRUPTS_ON();
	while (!b_oalInterruptFlag)	{}
	INTERRUPTS_OFF();
	
	s2443CLKPWR->PWRMODE &=  ~(1 << 17);	


	#if IDLELED_ACTIVATE==TRUE
	s2443IOPORT->GPFDAT &= ~(1 << 5);    // GPF5 output data, turn LED off		
	#endif

	ChangeVoltage(HIGHVOLTAGE);
	{	
		// Voltage Difference : 0.55V needs 100usec --> in 133MHZ, 13300 cycles
	 	volatile int i;
		for(i=0;i<VOLTAGEDELAY*2;i++)
		{
			INREG32(&s2443IOPORT->GPFDAT);  // for loop operation, just read.
		}	
	}
		DVS_OFF();
		g_oalIoCtlClockSpeed = S3C2443_FCLK;
//		RETAILMSG(1, (TEXT("O")));	
#elif (DVS_METHOD == 3)
	if ( CurrentState == Active )	// Active -> Idle
	{
		#if IDLELED_ACTIVATE==TRUE
		s2443IOPORT->GPFDAT &= ~(1 << 5);    // GPF5 output data, turn LED off		
		#endif	

		DVS_ON();
		g_oalIoCtlClockSpeed = S3C2443_HCLK;
		ChangeVoltage(MIDVOLTAGE);

		b_oalInterruptFlag = FALSE;
		IDLEflag = TRUE;
//		RETAILMSG(1, (TEXT("-I-")));


		s2443CLKPWR->PWRMODE |=  (1 << 17);
//		MMU_WaitForInterrupt();
		INTERRUPTS_ON();
		while (!b_oalInterruptFlag)	{}
		INTERRUPTS_OFF();
		s2443CLKPWR->PWRMODE &=  ~(1 << 17);
	

		IDLEflag = FALSE;
		#if IDLELED_ACTIVATE==TRUE
		s2443IOPORT->GPFDAT |= ( 1<< 5);    // GPF5 output data, turn LED on		
		#endif
	}
	else if ( CurrentState == SlowActive )	// Slow Active -> Deep Idle
	{
		#if IDLELED_ACTIVATE==TRUE
		s2443IOPORT->GPFDAT &= ~(1 << 5);    // GPF5 output data, turn LED off		
		#endif	

		if ( CurrStateIdle == TRUE )
		{
			s2443INT->INTSUBMSK |= (1 << IRQ_SUB_LCD3);		// masking LCD3 sub interrupt					
			s2443INT->INTMSK |= (1 << IRQ_LCD);		// maksing LCD interrupt
			s2443LCD->VIDINTCON &= ~(0x1);	// disable LCD interrupt
		}
		else
		{
			s2443INT->INTSUBMSK &= ~(1 << IRQ_SUB_LCD3);		// unmasking LCD3 sub interrupt			
			s2443INT->INTMSK &= ~(1 << IRQ_LCD);		// unmasking LCD interrupt
			s2443LCD->VIDINTCON |= (0x1);	// enable LCD interrupt	
		}

		if  ( s2443INT->SUBSRCPND & (1 << IRQ_SUB_LCD3) ) s2443INT->SUBSRCPND = (1<<IRQ_SUB_LCD3);
		if  ( s2443INT->SRCPND & (1 << IRQ_LCD)) s2443INT->SRCPND = (1 << IRQ_LCD);
		if  ( s2443INT->INTPND & (1 << IRQ_LCD)) s2443INT->INTPND = (1 << IRQ_LCD);
		

		b_oalInterruptFlag = FALSE;
		IDLEflag = TRUE;
//		RETAILMSG(1, (TEXT("-D-")));


		s2443CLKPWR->PWRMODE |=  (1 << 17);
//		MMU_WaitForInterrupt();
		INTERRUPTS_ON();
		while (!b_oalInterruptFlag)	{}
		INTERRUPTS_OFF();
		s2443CLKPWR->PWRMODE &=  ~(1 << 17);


		IDLEflag = FALSE;
		#if IDLELED_ACTIVATE==TRUE
		s2443IOPORT->GPFDAT |= ( 1<< 5);    // GPF5 output data, turn LED on
		#endif

		if  ( s2443INT->SUBSRCPND & (1 << IRQ_SUB_LCD3) ) s2443INT->SUBSRCPND = (1<<IRQ_SUB_LCD3);
		if  ( s2443INT->SRCPND & (1 << IRQ_LCD)) s2443INT->SRCPND = (1 << IRQ_LCD);
		if  ( s2443INT->INTPND & (1 << IRQ_LCD)) s2443INT->INTPND = (1 << IRQ_LCD);

		if ( CurrStateIdle == FALSE ){
			s2443INT->INTSUBMSK |= (1 << IRQ_SUB_LCD3);		// masking LCD3 sub interrupt					
			s2443INT->INTMSK |= (1 << IRQ_LCD);		// maksing LCD interrupt
			s2443LCD->VIDINTCON &= ~(0x1);	// disable LCD interrupt
		}
		else
		{
			s2443INT->INTSUBMSK &= ~(1 << IRQ_SUB_LCD3);		// unmasking LCD3 sub interrupt			
			s2443INT->INTMSK &= ~(1 << IRQ_LCD);		// unmasking LCD interrupt
			s2443LCD->VIDINTCON |= (0x1);	// enable LCD interrupt	
		}
	}
#endif //DVS_METHOD
#else
    
	// Clear last SYSINTR global value
	//g_oalLastSysIntr = SYSINTR_NOP;
	b_oalInterruptFlag = FALSE;

	

	s2443IOPORT->GPFDAT |= ( 1<< 5);    // GPF5 output data, turn LED on
	s2443CLKPWR->PWRMODE |=  (1 << 17);
	
	//MMU_WaitForInterrupt();
	INTERRUPTS_ON();
	while (!b_oalInterruptFlag)	{}
	INTERRUPTS_OFF();
	s2443CLKPWR->PWRMODE &=  ~(1 << 17);

	s2443IOPORT->GPFDAT &= ~(1 << 5);    // GPF5 output data, turn LED off
	
#endif //DVS_EN	
}