timer_vartick.c

SMDK2416_BSP

				
				CurrentState = LazyActive;
				RETAILMSG(0, (TEXT("-L-")));
			}
		}
	}
}
#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;

#if (BSP_TYPE == BSP_SMDK2443)
#if 1// for WFI

        OUTREG32(&g_pIntrRegs->SRCPND, 1 << IRQ_TIMER4);
        OUTREG32(&g_pIntrRegs->INTPND, 1 << IRQ_TIMER4);
#endif	
#elif (BSP_TYPE == BSP_SMDK2450)
    static DWORD HeartBeatCnt, HeartBeatStat;  //LED4 is used for heart beat	
        // Clear the interrupt
        OUTREG32(&g_pIntrRegs->SRCPND1, 1 << IRQFORTIMER);
        OUTREG32(&g_pIntrRegs->INTPND1, 1 << IRQFORTIMER);
#ifndef DVS_EN
		if (++HeartBeatCnt > 100)
		{
			HeartBeatCnt   = 0;
			HeartBeatStat ^= 1;
			g_pPortRegs->GPCCON = (g_pPortRegs->GPCCON & ~(3<<14)) | (1<<14); 
			if (HeartBeatStat) 
			{
				g_pPortRegs->GPCDAT &= ~(1<<7); // LED 4 Off
			}
			else
			{
				g_pPortRegs->GPCDAT |=  (1<<7); // LED 4 On
			}
		}
#endif
#endif	
    // Update high resolution counter
    g_oalTimer.curCounts += g_oalTimer.countsPerSysTick*g_idleMSec;
                             
    // Update the millisecond counter
    CurMSec += g_idleMSec;

	OALTimerUpdate(g_oalTimer.countsPerSysTick, g_oalTimer.countsMargin);
	g_idleMSec = 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
	ChangeSystemStateDVS();
#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 (INREG32(&g_pPWMRegs->TCNTB4) - 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 | (0x1 << 20) );

	return (ret);
}

//------------------------------------------------------------------------------
//
//  Function:     OEMIdle
//
//  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.
//
//
VOID OALCPUIdle()
{
#if (BSP_TYPE == BSP_SMDK2443)
    volatile S3C2450_CLKPWR_REG *s2450CLKPWR = (S3C2450_CLKPWR_REG *)OALPAtoVA(S3C2450_BASE_REG_PA_CLOCK_POWER, FALSE);
    volatile S3C2450_INTR_REG *s2450INTR = (S3C2450_INTR_REG *)OALPAtoVA(S3C2450_BASE_REG_PA_INTR, FALSE);
    volatile S3C2450_IOPORT_REG *s2450IOPORT = (S3C2450_IOPORT_REG *)OALPAtoVA(S3C2450_BASE_REG_PA_IOPORT, FALSE);


     UINT32 sysIntr;
	
	s2450IOPORT->GPFDAT |= ( 1<< 5);    // GPF5 output data, turn LED on
	s2450CLKPWR->PWRMODE |=  (1 << 17);
	
	MMU_WaitForInterrupt();


	s2450CLKPWR->PWRMODE &=  ~(1 << 17);
	s2450IOPORT->GPFDAT &= ~(1 << 5);    // GPF5 output data, turn LED off
	
	if(g_pIntrRegs->SRCPND & (1<< IRQ_TIMER4))
		sysIntr = OALTimerIntrHandler();
#elif (BSP_TYPE == BSP_SMDK2450)
#ifndef DVS_EN
	g_pPortRegs->GPCCON &= ~(3<< 0);
	g_pPortRegs->GPCCON |= ( 1<< 0);    
	g_pPortRegs->GPCDAT |= ( 1<< 0);    
#endif
//	g_pClkpwrRegs->PWRCFG = g_pClkpwrRegs->PWRCFG&~(0x3<<0)|(0x1<<0);
//	g_pClkpwrRegs->PWRCFG |= (1<<17);  
//	g_pClkpwrRegs->PWRCFG &=~(0x3<<5);
	g_pClkpwrRegs->PWRMODE |=  (1 << 17);
	
	MMU_WaitForInterrupt();

	g_pClkpwrRegs->PWRMODE &=  ~(1 << 17);
	
	if((g_pIntrRegs->SRCPND1 & (1<<IRQFORTIMER)) != 0)
	{
		OALTimerIntrHandler();		
	}
#ifndef DVS_EN	
	g_pPortRegs->GPCDAT &= ~(1 << 0);   
#endif
#endif

}