//------------------------------------------------------------------------------
//
// 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.
//
// This implementation doesn't change system tick. It is intend to be used
// with variable tick implementation. However it should work with fixed
// variable tick implementation also (with lower efficiency because maximal
// idle time is 1 ms).
//
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();
// 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;
}
//------------------------------------------------------------------------------
//
// 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)
{
#if (BSP_TYPE == BSP_SMDK2443)
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);
#elif (BSP_TYPE == BSP_SMDK2450)
#if 0 // Fixed Tick do not Update TImer
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);
#else
return 0;
#endif
#endif
}
//------------------------------------------------------------------------------
//
// Function: OALTimerIntrHandler
//
// This function implement timer interrupt handler. It is called from common
// ARM interrupt handler.
//
UINT32 OALTimerIntrHandler()
{
UINT32 sysIntr = SYSINTR_NOP;
LastTimerMatch = g_XllpOSTHandle.pOSTRegs->osmr0;
#ifdef OAL_ILTIMING
if (g_oalILT.active) {
g_oalILT.isrTime1 = OALTimerCountsSinceSysTick();
}
#endif
// g_LastPartialCounts represents fractional milliseconds which will
// be added to CurMSec once they add up to one MSec.
g_TotalPartialCounts += g_LastPartialCounts;
g_LastPartialCounts = 0;
if ((g_TotalPartialCounts > g_oalTimer.countsPerMSec))
{
CurMSec++;
g_TotalPartialCounts -= g_oalTimer.countsPerMSec;
}
// Update the millisecond and high resolution counters
CurMSec += g_oalTimer.actualMSecPerSysTick;
g_oalTimer.curCounts += g_oalTimer.actualCountsPerSysTick;
//Re-schedule?
if ((INT32)(CurMSec - dwReschedTime) >= 0) {
sysIntr = SYSINTR_RESCHED;
// Recharge timer with the maximum period possible from now. Kernel will call
// OALTimerUpdateRescheduleTime to set it to the correct value it wants.
RechargeTimer(CurMSec + g_oalTimer.maxPeriodMSec);
}
else {
RechargeTimer(dwReschedTime);
}
// Update LEDs.
// (Right shift by 10 instead of expensive division by 1000. This will
// cause the LEDs to update every 1.024 seconds instead every 1 second,
// which is okay as this is just a notification and not a measurement of any sort)
OEMWriteDebugLED(0, CurMSec >> 10);
#ifdef OAL_ILTIMING
if (g_oalILT.active) {
g_oalILT.counter--;
if (g_oalILT.counter == 0) {
sysIntr = SYSINTR_TIMING;
g_oalILT.counter = g_oalILT.counterSet;
g_oalILT.isrTime2 = OALTimerCountsSinceSysTick();
}
}
#endif
return (sysIntr);
}
//------------------------------------------------------------------------------
//
// Function: OALTimerUpdateRescheduleTime
//
// This function is called by kernel to set next reschedule time.
//
VOID OALTimerUpdateRescheduleTime(DWORD time)
{
UINT32 baseMSec;
INT32 counts;
// Get current system timer counter
baseMSec = CurMSec;
// Return if we are already setup correctly
if (time == (baseMSec + g_oalTimer.actualMSecPerSysTick)) goto cleanUp;
// How far we are from next tick
counts = g_oalTimer.actualCountsPerSysTick - OALTimerCountsSinceSysTick();
// If timer interrupts occurs, or we are within 1 ms of the scheduled
// interrupt, just return - timer ISR will take care of it.
if (baseMSec != CurMSec || counts < (INT32)g_oalTimer.countsPerMSec) {
goto cleanUp;
}
//Note: We are going to assume that RechargeTimer will not take more than 1 ms and since we have already
// checked above that there is at least 1 ms before the next timer interrupt, no timer interrupts
// can occur during RechargeTimer execution (thus we satisfy the condition imposed by RechargeTimer)
RechargeTimer(time);
cleanUp:
return;
}
//------------------------------------------------------------------------------
//
// 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
//[david.modify] 2008-09-09 17:30
// GPF4在4.3INCH项目上用做MENU_KEY
#if 0
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
#endif
// 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
ChangeSystemStateDVS();
#endif
return sysIntr;
}
