s3c2510timer.c

S3c2510下的VXWORKS的BSP源代码（包括了以太网、串口、USB等等驱动）

/* s3c2510Timer.c - SAMSUNG S3C2500 timer driver */

/* Copyright 2002 SAMSUNG ELECTRONICS */

/*
modification history
--------------------
01a,08feb02,jmLee   created.
*/


#include "vxWorks.h"
#include "intLib.h"
#include "errno.h"
#include "drv/timer/timerDev.h"
#include "drv/timer/timestampDev.h"

#include "drv/multi/s3c2510.h"
#include "config.h"
#include "drv/intrCtl/s3c2510Intr.h"
#include "drv/timer/s3c2510Timer.h"


/* Local forward declarations */

LOCAL BOOL sysClkConnectFirstTime       = TRUE;
LOCAL FUNCPTR sysClkRoutine             = NULL;
LOCAL int sysClkArg                     = 0;
LOCAL int sysClkRunning                 = FALSE;
LOCAL int sysClkTicksPerSecond          = DEF_SYS_CLK_TICKS;

LOCAL BOOL sysAuxClkConnectFirstTime    = TRUE;
LOCAL FUNCPTR sysAuxClkRoutine          = NULL;
LOCAL int sysAuxClkArg                  = 0;
LOCAL int sysAuxClkRunning              = FALSE;
LOCAL int sysAuxClkTicksPerSecond       = DEF_SYS_AUX_CLK_TICKS;

#ifdef  INCLUDE_TIMESTAMP
LOCAL BOOL sysTimestampConnectFirstTime = TRUE;
LOCAL FUNCPTR sysTimestampRoutine       = NULL;
LOCAL int sysTimestampArg               = 0;
LOCAL BOOL sysTimestampRunning          = FALSE;
#endif  /* INCLUDE_TIMESTAMP */


/*******************************************************************************
*
* sysClkInt - clock interrupt handler
*
* This routine handles the clock interrupt on the S3C9500 architecture. It is
* attached to the TIMER5 vector by the routine sysClkConnect().
*
* RETURNS : N/A
*/

LOCAL void sysClkInt(void)
{
    /* Clear interrupt. */
    *S3C2510_TIC |= S3C2510_TIC_T5;

#ifdef INCLUDE_LED
    {
        static int count = 0;

        if (!(count % (sysClkRateGet() / 2)))
        {
            if (!(count % sysClkRateGet()))
            {
                LED_ON(LED1_MASK);
            }
            else
            {
                LED_OFF(LED1_MASK);
            }
        }

        if (!(count % (sysClkRateGet() / 10)))
        {
            LED_OFF(LED6_MASK | LED7_MASK | LED8_MASK);
        }

        count++;
    }
#endif  /* INCLUDE_LED */ 

    /* Call system clock service routine. */
    if (sysClkRoutine && sysClkRunning)
    {
        (*sysClkRoutine)(sysClkArg);
    }
}

/*******************************************************************************
*
* sysClkConnect - connect a routine to the system clock interrupt
*
* This routine specifies the interrupt service routine to be called at each
* clock interrupt. Normally, it is called from usrRoot() in usrConfig.c to
* connect usrClock() to the system clock interrupt.
*
* RETURNS: OK, or ERROR if the routine cannot be connected to the interrupt.
*
* SEE ALSO: intConnect(), usrClock(), sysClkEnable()
*/

STATUS sysClkConnect(
    FUNCPTR routine,                                        /* routine called at each clock interrupt */
    int arg                                                 /* argument to clock interrupt routine */
    )
{
    if (sysClkConnectFirstTime)
    {
        sysHwInit2();

        /* Enable peripheral clock. */
        *S3C2510_PCLKDIS &= ~S3C2510_PCLKDIS_TIMER5;

        /* Interval mode. */
        *S3C2510_TMOD &= ~S3C2510_TMOD_TMD5;

        /* Connect and enable interrupt. */
        intConnect(INT_VEC_TIMER5, (VOIDFUNCPTR)sysClkInt, 0);
        intEnable(INT_LVL_TIMER5);

        sysClkConnectFirstTime = FALSE;
   }

    sysClkRoutine   = routine;
    sysClkArg       = arg;

    return OK;
}

/*******************************************************************************
*
* sysClkDisable - turn off system clock interrupts
*
* This routine disables system clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysClkEnable()
*/

void sysClkDisable(void)
{
    if (sysClkRunning)
    {
        /* Disable timer. */
        *S3C2510_TMOD &= ~S3C2510_TMOD_TE5;

        sysClkRunning = FALSE;
    }
}

/*******************************************************************************
*
* sysClkEnable - turn on system clock interrupts
*
* This routine enables system clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysClkConnect(), sysClkDisable(), sysClkRateSet()
*/

void sysClkEnable(void)
{
    if (!sysClkRunning)
    {
        /* Calculate the timer interval. */
        *S3C2510_TDATA5 = SPLL_FREQ * 1000 * 1000 / sysClkTicksPerSecond - 1;

        /* Enable timer. */
        *S3C2510_TMOD |= S3C2510_TMOD_TE5;

        sysClkRunning = TRUE;
    }
}

/*******************************************************************************
*
* sysClkRateGet - get the system clock rate
*
* This routine returns the system clock rate.
*
* RETURNS: The number of ticks per second of the system clock.
*
* SEE ALSO: sysClkEnable(), sysClkRateSet()
*/

int sysClkRateGet(void)
{
    return (sysClkTicksPerSecond);
}


/*******************************************************************************
*
* sysClkRateSet - set the system clock rate
*
* This routine sets the interrupt rate of the system clock. It is called by
* usrRoot() in usrConfig.c.
*
* RETURNS: OK, or ERROR if the tick rate is invalid or the timer cannot be set.
*
* SEE ALSO: sysClkEnable(), sysClkRateGet()
*/

STATUS sysClkRateSet(
    int ticksPerSecond                                      /* number of clock interrupts per second */
    )
{
    if ((ticksPerSecond < SYS_CLK_RATE_MIN) || (ticksPerSecond > SYS_CLK_RATE_MAX))
    {
        return ERROR;
    }

    sysClkTicksPerSecond = ticksPerSecond;

    if (sysClkRunning)
    {
        sysClkDisable();
        sysClkEnable();
    }
    
    LED_ON(LED8_MASK);
    
    return OK;
}

/*******************************************************************************
*
* sysAuxClkInt - auxiliary clock interrupt handler
*
* This routine handles the auxiliary clock interrupton the S3C9500 architecture.
* It is attached to the TIMER5 vector by the routine sysAuxClkConnect().
*
* RETURNS : N/A
*/

LOCAL void sysAuxClkInt(void)
{
    /* Clear interrupt. */
    *S3C2510_TIC |= S3C2510_TIC_T4;

    /* Call auxiliary clock service routine. */
    if (sysAuxClkRoutine && sysAuxClkRunning)
    {
        (*sysAuxClkRoutine)(sysAuxClkArg);
    }
}

/*******************************************************************************
*
* sysAuxClkConnect - connect a routine to the auxiliary clock interrupt
*
* This routine specifies the interrupt service routine to be called at each
* auxiliary clock interrupt. It does not enable auxiliary clock interrupts.
*
* RETURNS: OK, or ERROR if the routine cannot be connected to the interrupt.
*
* SEE ALSO: intConnect(), sysAuxClkEnable()
*/

STATUS sysAuxClkConnect(
    FUNCPTR routine,                                        /* routine called at each auxiliary clock interrupt */
    int arg                                                 /* argument to auxiliary clock interrupt routine */
    )
{
    if (sysAuxClkConnectFirstTime)
    {
        /* Enable peripheral clock. */
        *S3C2510_PCLKDIS &= ~S3C2510_PCLKDIS_TIMER4;

        /* Interval mode. */
        *S3C2510_TMOD &= ~S3C2510_TMOD_TMD4;

        /* Connect and enable interrupt. */
        intConnect(INT_VEC_TIMER4, (VOIDFUNCPTR)sysAuxClkInt, 0);
        intEnable(INT_LVL_TIMER4);

        sysAuxClkConnectFirstTime = FALSE;
    }

    sysAuxClkRoutine    = routine;
    sysAuxClkArg        = arg;

    return OK;