timer_fixedtick.c

S3C2443 WINCE6.0 BSP

	
	if ( dwCurrentMSec - dwPrevTotalTick100 > 100 )
	{
		dwPercentIdle100 = ((100*(dwCurrentIdleSec - dwPrevIdleTick100)) / (dwCurrentMSec - dwPrevTotalTick100));
		dwPrevTotalTick100 = dwCurrentMSec;
		dwPrevIdleTick100 = dwCurrentIdleSec;
		if ( dwPercentIdle100 < 20 )
		{
			if ( CurrentState == SlowActive)
			{
				if ( GetCurrentVoltage() != HIGHVOLTAGE )
				{
#ifdef UNDERSHOOT_WORKAROUND
	{	
	 	volatile int i;
		for(i=0;i<VOLTAGEDELAY;i++);
	}
#endif					
					// DVS OFF...
					ChangeVoltage(HIGHVOLTAGE);
					for(i=0; i < VOLTAGEDELAY; i++);
					RETAILMSG(0, (TEXT("H")));					
				}
				DVS_OFF();
				g_oalIoCtlClockSpeed = S3C2443_FCLK;

				CurrentState = Active;
				SlowCount = 0;

				RETAILMSG(0, (TEXT("-A-")));
			}

			if( CurrentState == LazyActive)		// Change state from SlowActive to Active...
			{
				if ( GetCurrentVoltage() != HIGHVOLTAGE )
				{
#ifdef UNDERSHOOT_WORKAROUND
	{	
	 	volatile int i;
		for(i=0;i<VOLTAGEDELAY;i++);
	}
#endif					
					// DVS OFF...
					ChangeVoltage(HIGHVOLTAGE);
					for(i=0; i < VOLTAGEDELAY; i++);
					RETAILMSG(0, (TEXT("H")));					
				}
				DVS_OFF();
				g_oalIoCtlClockSpeed = S3C2443_FCLK;
				
				HCLK_RECOVERYUP();

				CurrentState = Active;
				SlowCount = 0;

				RETAILMSG(0, (TEXT("-A-")));
			}
		}
	}
	if ( dwCurrentMSec - dwPrevTotalTick1000 > 1000 )
	{
		dwPercentIdle1000 = ((100*(dwCurrentIdleSec - dwPrevIdleTick1000)) / (dwCurrentMSec - dwPrevTotalTick1000));
		dwPrevTotalTick1000 = dwCurrentMSec;
		dwPrevIdleTick1000 = dwCurrentIdleSec;
		RETAILMSG(0, (TEXT("%d,%d "), dwPercentIdle100, CurrentState));
		if ( dwPercentIdle1000 > 70 )
		{
			if ( CurrentState == Active)
			{
				DVS_ON();				
				ChangeVoltage(MIDVOLTAGE);
				g_oalIoCtlClockSpeed = S3C2443_HCLK;
				CurrentState = SlowActive;
				RETAILMSG(0, (TEXT("-S-")));
			}
			else if ( CurrentState == SlowActive && SlowCount++ >= 2)
			{
				HCLK_DOWNTO_PCLK();
				g_oalIoCtlClockSpeed = S3C2443_PCLK;
				if (GetCurrentVoltage() == MIDVOLTAGE ){
					ChangeVoltage(LOWVOLTAGE);
					RETAILMSG(0, (TEXT("L")));
				}
				
				CurrentState = LazyActive;
				RETAILMSG(0, (TEXT("-L-")));
			}
		}
	}
}
#endif	// DVS_METHOD
#endif	// DVS_EN
//------------------------------------------------------------------------------
//
//  Function: OALTimerIntrHandler
//
//  This function implement timer interrupt handler. It is called from common
//  ARM interrupt handler.
//
UINT32 OALTimerIntrHandler()
{
    UINT32 sysIntr = SYSINTR_NOP;

    // Update high resolution counter
    g_oalTimer.curCounts += g_oalTimer.countsPerSysTick;
                             
    // Update the millisecond counter
    CurMSec += g_oalTimer.msecPerSysTick;


    // Reschedule?
    if ((int)(CurMSec - dwReschedTime) >= 0) sysIntr = SYSINTR_RESCHED;

#ifdef OAL_ILTIMING
    if (g_oalILT.active) {
        if (--g_oalILT.counter == 0) {
            sysIntr = SYSINTR_TIMING;
            g_oalILT.counter = g_oalILT.counterSet;
            g_oalILT.isrTime2 = OALTimerCountsSinceSysTick();
        }
    }
#endif

#ifdef DVS_EN
#if (DVS_METHOD == 4 || DVS_METHOD == 5)
	ChangeSystemStateDVS();
#endif
#endif
    return sysIntr;
}


//------------------------------------------------------------------------------
//
//  Function: OALTimerCountsSinceSysTick
//
//  This function return count of hi res ticks since system tick.
//
//  Timer 4 counts down, so we should substract actual value from 
//  system tick period.
//

INT32 OALTimerCountsSinceSysTick()
{
	return (g_oalTimer.countsPerSysTick - INREG32(&g_pPWMRegs->TCNTO4));
}

//------------------------------------------------------------------------------
//
//  Function: OALTimerUpdate
//
//  This function is called to change length of actual system timer period.
//  If end of actual period is closer than margin period isn't changed (so
//  original period elapse). Function returns time which already expires
//  in new period length units. If end of new period is closer to actual time
//  than margin period end is shifted by margin (but next period should fix
//  this shift - this is reason why OALTimerRecharge doesn't read back 
//  compare register and it uses saved value instead).
//
UINT32 OALTimerUpdate(UINT32 period, UINT32 margin)
{
	UINT32 tcon, ret;
	
	ret = OALTimerCountsSinceSysTick();

	OUTREG32(&g_pPWMRegs->TCNTB4, period);
    tcon = INREG32(&g_pPWMRegs->TCON) & ~(0x0F << 20);
    OUTREG32(&g_pPWMRegs->TCON, tcon | (0x2 << 20) );
    OUTREG32(&g_pPWMRegs->TCON, tcon | (0x5 << 20) );

	return (ret);
}
//------------------------------------------------------------------------------
//
//  Function:   OEMIdle
//
//  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.
//

//
void OEMIdle(DWORD idleParam)
{
   UINT32 baseMSec;
    INT32 usedCounts, idleCounts;
    ULARGE_INTEGER idle;

    // Get current system timer counter
    baseMSec = CurMSec;
    
    // Find how many hi-res ticks was already used
    usedCounts = OALTimerCountsSinceSysTick();
	if (usedCounts == g_oalTimer.countsPerSysTick)
	{
		return;
	}
    // We should wait this time
    idleCounts = g_oalTimer.actualCountsPerSysTick;
    
    // Move SoC/CPU to idle mode
    OALCPUIdle();

    // When there wasn't timer interrupt modify idle time
    if (CurMSec == baseMSec) {
        idleCounts = OALTimerCountsSinceSysTick();
    }

    // Get real idle value. If result is negative we didn't idle at all.
    idleCounts -= usedCounts;
    if (idleCounts < 0) idleCounts = 0;

    // 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.
//

VOID OALCPUIdle()
{
    volatile S3C2443_CLKPWR_REG *s2443CLKPWR = (S3C2443_CLKPWR_REG *)OALPAtoVA(S3C2443_BASE_REG_PA_CLOCK_POWER, FALSE);
    volatile S3C2443_IOPORT_REG *s2443IOPORT = (S3C2443_IOPORT_REG *)OALPAtoVA(S3C2443_BASE_REG_PA_IOPORT, FALSE);
    
    // 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);

    // Wait until interrupt handler set interrupt flag
	INTERRUPTS_ON();
	while (!b_oalInterruptFlag)	{};
	INTERRUPTS_OFF();
	s2443CLKPWR->PWRMODE &= ~(1 << 17);
	s2443IOPORT->GPFDAT &= ~(1 << 5);    // GPF5 output data, turn LED off
    
}