timer.c

三星S3c2410 WinCE Bsp,内含(eBoot)代码

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this source code is subject to the terms of the Microsoft end-user
// license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
// If you did not accept the terms of the EULA, you are not authorized to use
// this source code. For a copy of the EULA, please see the LICENSE.RTF on your
// install media.
//
/*++
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.
Copyright (c) 2001. Samsung Electronics, co. ltd  All rights reserved.

Module Name:  

Abstract:

    Platform dependent PCMCIA initialization functions

rev:
	2002.4.11	: RTC function work (Hyojoon KIM, [e-mail])
	2002.4.3	: first S3C2410 version (SOC)
	
	2002.2.5	: timer related bug fixups (kwangyoon LEE, [e-mail])
				  prevent timer round-up
					- CPUSetSysTimerCount()
					- CPUClearSysTimerIRQ()
					- CPUGetSysTimerCountElapsed()
	2002.1.29	: bug fixups (kwangyoon LEE, [e-mail])
					- PerfCountFreq()
					- PerfCountSinceTick()
					- CPUSetSysTimerCount()
					- CPUClearSysTimerIRQ()
					- CPUGetSysTimerCountElapsed()
					- CPUGetSysTimerCountMax()
	2002.1.28	: CE.NET initial port (kwangyoon LEE, [e-mail])

Notes: 
--*/

#include <windows.h>
#include <nkintr.h>

#include <S2410.h>

extern DWORD CurMSec;
extern DWORD DiffMSec;
DWORD dwReschedIncrement;
DWORD OEMCount1ms;
static volatile DWORD dwCurReschedIncr;

unsigned __int64 RealTimeBias = 0;  // Number of 100-nanosecond intervals since
                                    // January 1, 1601. 
DWORD AlarmTime = 0;    			// Alarm Off at startup

volatile BOOL fInterruptFlag;
volatile BOOL fSlowInterruptFlag;
unsigned int saveREFRESH;

//------------------------------------------------------------------------------
//
// When this is called we will set up GPIO<1> to be a falling edge interrupt  
// InitClock sets up the OS timer to int via match reg 0 on the IRQ level
// an int is requested in 1ms from now.
//
// Interrupts are disable when this is called. check with Thomas.
//
//------------------------------------------------------------------------------
void 
InitClock(void) 
{
    volatile PWMreg *s2410PWM =(PWMreg *)PWM_BASE;
    volatile INTreg *s2410INT = (INTreg *)INT_BASE;  
    DWORD ttmp;  


	// Timer4 as OS tick and disable it first.
    s2410INT->rINTMSK |= BIT_TIMER4;		// Mask timer4 interrupt.
    s2410INT->rSRCPND = BIT_TIMER4;			// Clear pending bit
    s2410INT->rINTPND = BIT_TIMER4;

    // Operating clock : PCLK=101500000 (101.5 Mhz)    
	// IMPORTANT : MUST CHECK S2410.H DEFINITIONS !!!!
    s2410PWM->rTCFG0 &= ~(0xff << 8);		/* Prescaler 1's Value			*/
	s2410PWM->rTCFG0 |= (PRESCALER << 8);	// prescaler value=15

#if( SYS_TIMER_DIVIDER == D2 )
	  	s2410PWM->rTCFG1  |=  (D1_2   << 16);		/* 1/2							*/
#elif ( SYS_TIMER_DIVIDER == D4 )
		s2410PWM->rTCFG1  |=  (D1_4   << 16);		/* 1/4							*/
#elif ( SYS_TIMER_DIVIDER == D8 )
	  	s2410PWM->rTCFG1  |=  (D1_8   << 16);		/* 1/8							*/
#elif ( SYS_TIMER_DIVIDER == D16 )
	  	s2410PWM->rTCFG1  |=  (D1_16   << 16);		/* 1/16							*/
#endif
	s2410PWM->rTCNTB4 = RESCHED_INCREMENT;	//((RESCHED_PERIOD * OEM_CLOCK_FREQ) / 1000)  	
	ttmp = s2410PWM->rTCON & (~(0xf << 20));

	s2410PWM->rTCON = ttmp | (2 << 20);		/* update TCVNTB4, stop					*/
	s2410PWM->rTCON = ttmp | (1 << 20);		/* one-shot mode,  start				*/

    // Number of timer counts for reschedule interval
    dwReschedIncrement = RESCHED_INCREMENT;

	// Set OEM timer count for 1 ms
    OEMCount1ms = OEM_COUNT_1MS;
    
    // Set OEM clock frequency
    OEMClockFreq = OEM_CLOCK_FREQ;

    s2410INT->rINTMSK &= ~BIT_TIMER4;		

    return;
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
DWORD 
GetTimerPeriod(void) 
{
    return RESCHED_PERIOD;
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
#define FROM_BCD(n)		((((n) >> 4) * 10) + ((n) & 0xf))

// NOTE: The RTC on the SMDK2410 isn't battery-backed so RTC settings will be lost
// when power is removed.
//
BOOL 
OEMGetRealTime(LPSYSTEMTIME lpst) 
{
	volatile RTCreg *s2410RTC = (RTCreg *)RTC_BASE;

	do
	{
		lpst->wYear			= FROM_BCD(s2410RTC->rBCDYEAR) + 2000 ;
		lpst->wMonth		= FROM_BCD(s2410RTC->rBCDMON   & 0x1f);
		lpst->wDay			= FROM_BCD(s2410RTC->rBCDDAY   & 0x3f);

		lpst->wDayOfWeek	= (s2410RTC->rBCDDATE - 1);
	
		lpst->wHour			= FROM_BCD(s2410RTC->rBCDHOUR  & 0x3f);
		lpst->wMinute		= FROM_BCD(s2410RTC->rBCDMIN   & 0x7f);
		lpst->wSecond		= FROM_BCD(s2410RTC->rBCDSEC   & 0x7f);
		lpst->wMilliseconds	= 0;
	}
	while(!(lpst->wSecond));

	return(TRUE);
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
#define TO_BCD(n)		((((n) / 10) << 4) | ((n) % 10))

// NOTE: The RTC on the SMDK2410 isn't battery-backed so RTC settings will be lost
// when power is removed.
//
BOOL
OEMSetRealTime(LPSYSTEMTIME lpst) 
{
	volatile RTCreg *s2410RTC = (RTCreg *)RTC_BASE;
 
	// Enable RTC control.
	//
	s2410RTC->rRTCCON |= 1;

	s2410RTC->rBCDSEC  = (unsigned char)TO_BCD(lpst->wSecond );
	s2410RTC->rBCDMIN  = (unsigned char)TO_BCD(lpst->wMinute );
	s2410RTC->rBCDHOUR = (unsigned char)TO_BCD(lpst->wHour   );

	s2410RTC->rBCDDATE = (unsigned char)(lpst->wDayOfWeek + 1);

	s2410RTC->rBCDDAY  = (unsigned char)TO_BCD(lpst->wDay    );
	s2410RTC->rBCDMON  = (unsigned char)TO_BCD(lpst->wMonth  );
	s2410RTC->rBCDYEAR = (unsigned char)TO_BCD((lpst->wYear % 100));

	RETAILMSG(1,(TEXT("OEMSetRealTime: Year: %x, Month: %x, Day: %x, Hour: %x, Minute: %x, second: %x rcnr=%Xh\n"), \
   		s2410RTC->rBCDYEAR, s2410RTC->rBCDMON,s2410RTC->rBCDDAY, s2410RTC->rBCDHOUR, s2410RTC->rBCDMIN,s2410RTC->rBCDSEC,s2410RTC->rRTCCON));

	// Disable RTC control.
	//
	s2410RTC->rRTCCON &= ~1;
	
	return(TRUE);
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
BOOL 
OEMSetAlarmTime(LPSYSTEMTIME lpst) 
{
    volatile RTCreg *s2410RTC = (RTCreg *)RTC_BASE;
    
    s2410RTC->rRTCCON = (1 << 0);					/* RTC Control Enable 			*/
    
    s2410RTC->rALMSEC  = (unsigned char)TO_BCD(lpst->wSecond );
    s2410RTC->rALMMIN  = (unsigned char)TO_BCD(lpst->wMinute );
    s2410RTC->rALMHOUR = (unsigned char)TO_BCD(lpst->wHour   );

    s2410RTC->rALMDAY  = (unsigned char)TO_BCD(lpst->wDay    );
    s2410RTC->rALMMON  = (unsigned char)TO_BCD(lpst->wMonth  );
    s2410RTC->rALMYEAR = (unsigned char)TO_BCD((lpst->wYear % 100));

	s2410RTC->rRTCCON = (0 << 0);					/* RTC Control Disable			*/

	
    return TRUE;
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
DWORD
PerfCountFreq()
{
    return (OEMClockFreq);
}



//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
DWORD
PerfCountSinceTick()
{
    volatile PWMreg *s2410PWM;
    DWORD dwCount;

    s2410PWM = (PWMreg *)PWM_BASE;

    dwCount= ((DWORD)s2410PWM->rTCNTO4);
    
    // Note: if dwCount is negative, the counter went past the match point.  The math
	// still works since it accounts for the dwReschedIncr time plus the time past
	// the match.
    return dwCurReschedIncr - dwCount;
}


//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
void
CPUSetSysTimerCount(
    DWORD dwCountdownMSec
    )
{
	DWORD dwMatch, ttmp;
	volatile PWMreg *s2410PWM;

    s2410PWM = (PWMreg *)PWM_BASE;
	
    dwCurReschedIncr = dwCountdownMSec * OEMCount1ms;
    dwMatch = dwCurReschedIncr;

	s2410PWM->rTCNTB4 = dwMatch;

	ttmp = s2410PWM->rTCON & (~(0xf << 20));

	s2410PWM->rTCON = ttmp | (2 << 20);		/* update TCVNTB4, stop					*/
	s2410PWM->rTCON = ttmp | (1 << 20);		/* one-shot mode,  start				*/
}


//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
BOOL
CPUClearSysTimerIRQ(
    void
    )
{
	volatile INTreg *s2410INT; 
	BOOL fPending;
	DWORD intstatus;
	    
	s2410INT = (INTreg *)INT_BASE;
		
	intstatus = s2410INT->rSRCPND;

	if ((intstatus & (BIT_TIMER4)) != 0) {
		s2410INT->rSRCPND = BIT_TIMER4;        
		s2410INT->rINTPND = BIT_TIMER4;
		fPending = TRUE;
	} else {
		fPending = FALSE;
	}
	
    return fPending;	
}


//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
DWORD
CPUGetSysTimerCountElapsed(
    DWORD dwTimerCountdownMSec,
    volatile DWORD *pCurMSec,
    DWORD *pPartialCurMSec,
    volatile ULARGE_INTEGER *pCurTicks
    )
{
    volatile PWMreg *s2410PWM;
	DWORD dwTick, dwCount;

    s2410PWM = (PWMreg *)PWM_BASE;
    dwTick = dwTimerCountdownMSec * OEMCount1ms;

    // If timer IRQ pending, a full resched period elapsed
    if (CPUClearSysTimerIRQ( )) {
        *pCurMSec += dwTimerCountdownMSec;
        pCurTicks->QuadPart += dwTick;
        return dwTimerCountdownMSec;
    }

    // No timer IRQ pending, calculate how much time has elapsed
	dwCount= ((DWORD)s2410PWM->rTCNTO4);	
	
    if (dwCount > dwTick) {
        // This is an error case.  Recover gracefully.
        dwCount = dwTick;
    } else {
        dwCount = dwTick - dwCount;
    }

    pCurTicks->QuadPart += dwCount;

    dwCount += *pPartialCurMSec;
    *pPartialCurMSec = dwCount % OEMCount1ms;
    *pCurMSec += (dwCount /= OEMCount1ms);

    return dwCount;
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
extern void CPUEnterIdleMode(void);

extern void OEMWriteDebugLED(WORD wIndex, DWORD dwPattern);

void
CPUEnterIdle()
{
	static volatile CLKPWRreg * s2410CLKPW = (CLKPWRreg *)CLKPWR_BASE;
	static volatile IOPreg    * s2410IOP   = (IOPreg    *)IOP_BASE;
	static volatile UART0reg    * s2410UART0   = (UART0reg    *)UART0_BASE;
	static volatile UART2reg    * s2410UART2   = (UART2reg    *)UART2_BASE;
	
	fInterruptFlag = FALSE;
	INTERRUPTS_ON();

	if ( !(s2410UART0->rUFSTAT & 0x3ff) || !(s2410UART2->rUFSTAT & 0x3ff) )		/* Check UART FIFO */
	{
//		if (!fSlowInterruptFlag)
//		{
//			s2410IOP->rGPFDAT &= ~(1 << 5);
//			s2410CLKPW->rCLKCON |=  (1 << 2);		/* Enter IDLE Mode                              */
//		}

		while (!fInterruptFlag) {}					/* Wait until S3C2410X enters IDLE mode         */
//		if (!fSlowInterruptFlag)
//		{
//			s2410CLKPW->rCLKCON &= ~(1 << 2);		/* turn-off IDLE bit.                           */
//													/* Any interrupt will wake up from IDLE mode    */
//			s2410IOP->rGPFDAT |= (1 << 5);
//		}
	}
	else
	{
		while (!fInterruptFlag) {}					/* Wait until S3C2410X enters IDLE mode         */
	}
}


// Maximum idle is fixed a 1 ms because the PIT has to count down to 0 before reloading
// the new countdown value.
#define IDLE_MAX_MS  100
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
DWORD
CPUGetSysTimerCountMax(
    DWORD dwIdleMSecRequested
    )
{
    if (dwIdleMSecRequested > IDLE_MAX_MS) {
        return IDLE_MAX_MS;
    }
    return dwIdleMSecRequested;
}

void EnterSlowMode()
{
	static volatile CLKPWRreg * s2410CLKPW  = (CLKPWRreg *)CLKPWR_BASE;
	static volatile IOPreg    * s2410IOP    = (IOPreg    *)IOP_BASE;
	static volatile MEMreg	  * s2410MemReg = (MEMreg      *)MEMCTRL_BASE;

	RETAILMSG(1,(TEXT("EnterSlowMode \r\n")));
	fSlowInterruptFlag = TRUE;
	s2410IOP->rGPFDAT &= ~(1 << 7);

	//FCLK=FIN/1, SLOW mode, MPLL=off, UPLL=off
	s2410CLKPW->rCLKSLOW |= (1<<4)|(1<<5)|(1<<7);
	saveREFRESH = s2410MemReg->rREFRESH;
	s2410MemReg->rREFRESH=(1<<23)|(unsigned int)(2048+1-12*15.6);
	//Trp=2clk, Trc=4clk
}

void ExitSlowMode()
{
	static volatile CLKPWRreg * s2410CLKPW  = (CLKPWRreg *)CLKPWR_BASE;
	static volatile IOPreg    * s2410IOP    = (IOPreg    *)IOP_BASE;
	static volatile MEMreg	  * s2410MemReg = (MEMreg      *)MEMCTRL_BASE;
	int i;

	RETAILMSG(1,(TEXT("ExitSlowMode \r\n")));
	fSlowInterruptFlag = FALSE;

	s2410CLKPW->rCLKSLOW = 0|(1<<4)|(0<<5);// PLL on, MPLL=on
	for ( i = 0; i < 2048; i++); //S/W MPLL lock-time
	s2410CLKPW->rCLKSLOW = 0|(0<<4)|(0<<5);// NORMAL mode, PLL=on, MPLL=on
	s2410MemReg->rREFRESH = saveREFRESH;

	s2410IOP->rGPFDAT |= (1 << 7);
}


void SetSysTimerInterval(DWORD dwTicks)
{
    volatile PWMreg *s2410PWM = (PWMreg *)PWM_BASE;
    volatile INTreg *s2410INT = (INTreg *)INT_BASE;  
    DWORD dwTimerTemp;  

	// Mask and clear timer interrupt.
	//
    s2410INT->rINTMSK |= BIT_TIMER4;
    s2410INT->rSRCPND  = BIT_TIMER4;
    s2410INT->rINTPND  = BIT_TIMER4;

	// Change number of timer ticks in the period.
	//
	s2410PWM->rTCNTB4 = dwTicks;
	dwTimerTemp = s2410PWM->rTCON & (~(0xf << 20));

	s2410PWM->rTCON = dwTimerTemp | (2 << 20);	// Update TCVNTB4 and stop.
	s2410PWM->rTCON = dwTimerTemp | (1 << 20);	// One-shot mode and start.

	// Unmask the timer interrupt.
	//
    s2410INT->rINTMSK &= ~BIT_TIMER4;		
}