s3c44b0xtimer.c

VxWorks BSP for S3C44B0X

/* s3c44b0xTimer.c - Samsung KS32C timer library */

/* Copyright 1984-2001 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
01a,12apr01,m_h  created from snds100 template.
*/

/*
DESCRIPTION
*/

/* includes */

#include "vxWorks.h"
#include "config.h"
#include "drv/timer/timerDev.h"
#include "drv/timer/timestampDev.h"
#include "s3c44b0xTimer.h"

/* defines */

/* The default is to assume memory mapped I/O */

/* locals */

LOCAL FUNCPTR sysClkRoutine    = NULL; /* routine to call on clock tick */
LOCAL int sysClkArg            = (int)NULL; /* its argument */
LOCAL int sysClkRunning        = FALSE;
LOCAL int sysClkConnected      = FALSE;
LOCAL int sysClkTicksPerSecond = 60;

LOCAL FUNCPTR sysAuxClkRoutine    = NULL;
LOCAL int sysAuxClkArg            = (int)NULL;
LOCAL int sysAuxClkRunning        = FALSE;
LOCAL int sysAuxClkTicksPerSecond = 100;
LOCAL int sysAuxClkTicks;

#ifdef INCLUDE_TIMESTAMP

LOCAL BOOL      sysTimestampRunning     = FALSE;         /* running flag */
LOCAL FUNCPTR   sysTimestampRoutine     = NULL;          /* routine to call on intr */
LOCAL int       sysTimestampArg         = 0;             /* arg for routine */
      void      sysTimestampInt (void);                  /* forward declaration */

#endif  /* INCLUDE_TIMESTAMP */

/*******************************************************************************
*
* sysClkInt - interrupt level processing for system clock
*
* This routine handles a system clock interrupt.  It acknowledges the
* interrupt and calls the routine installed by sysClkConnect().
*/

void sysClkInt (void)
    {

    /* call system clock service routine */

    if (sysClkRoutine != NULL)
        (* 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.
*
* RETURN: OK, or ERROR if the routine cannot be connected to the interrupt.
*
* SEE ALSO: intConnect(), usrClock(), sysClkEnable()
*/

STATUS sysClkConnect
    (
    FUNCPTR routine,    /* routine to be called at each clock interrupt */
    int arg        /* argument with which to call routine */
    )
    {

    if (sysClkConnected == FALSE)
        {
        int  buf;
        S3C44B0X_REG_READ32(S3C44B0X_TCON,buf);
        buf &= ~(0x07 << 24);
        S3C44B0X_REG_WRITE32(S3C44B0X_TCON,buf);

        S3C44B0X_REG_READ32(S3C44B0X_TCFG0,buf);
        buf  = (buf & ~(0x0ff << 16)) | (PRESCALER2 << 16);
        S3C44B0X_REG_WRITE32(S3C44B0X_TCFG0,buf);

        S3C44B0X_REG_READ32(S3C44B0X_TCFG1,buf);
        buf  = (buf & ~(0x0f  << 20)) | (MUX5 << 20);
        S3C44B0X_REG_WRITE32(S3C44B0X_TCFG1,buf);

        sysHwInit2 ();
        sysClkConnected = TRUE;
        }

    sysClkRoutine   = NULL;
    sysClkArg        = arg;

#if ((CPU_FAMILY == ARM) && ARM_THUMB)
    /* set b0 so that sysClkConnect() can be used from shell */
    sysClkRoutine = (FUNCPTR)((UINT32)routine | 1);
#else
    sysClkRoutine = routine;
#endif /* CPU_FAMILY == ARM */

    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)
        {
        int  buf;

        S3C44B0X_REG_READ32(S3C44B0X_TCON,buf);
        buf &= ~(0x07 << 24);
        S3C44B0X_REG_WRITE32(S3C44B0X_TCON,buf);

        /* disable timer interrupt in the interrupt controller */

        intDisable (SYS_TIMER_INT_LVL);

        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)
        {

        /*
         * Load the match register with a new value calculated by
         * adding the ticks per interrupt to the current value of the
         * counter register.  Note that this may wraparound to a value
         * less than the current counter value but thats OK.
         */

        int  buf;

        S3C44B0X_REG_WRITE32 (S3C44B0X_TCNTB5, COUNT / sysClkTicksPerSecond);
        S3C44B0X_REG_READ32 (S3C44B0X_TCON, buf);
        buf |= (0x06 << 24);
        S3C44B0X_REG_WRITE32 (S3C44B0X_TCON, buf);
        S3C44B0X_REG_READ32 (S3C44B0X_TCON, buf);
        buf |= (buf & ~(1 << 25)) | (1 << 24);
        S3C44B0X_REG_WRITE32 (S3C44B0X_TCON, buf);

        /* enable clock interrupt in interrupt controller */
        intEnable (SYS_TIMER_INT_LVL);
        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 ();
        }

    return (OK);
    }

/*******************************************************************************
*
* sysAuxClkInt - handle an auxiliary clock interrupt
*
* This routine handles an auxiliary clock interrupt.  It acknowledges the
* interrupt and calls the routine installed by sysAuxClkConnect().
*
* RETURNS: N/A
*/

void sysAuxClkInt (void)
    {
    /* call auxiliary clock service routine */

    if (sysAuxClkRoutine != NULL)
        (*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 aux clock interrupt */
    int arg             /* argument to auxiliary clock interrupt routine */
    )
    {
    sysAuxClkRoutine    = NULL;
    sysAuxClkArg        = arg;

#if ((CPU_FAMILY == ARM) && ARM_THUMB)
    /* set b0 so that sysClkConnect() can be used from shell */
    sysAuxClkRoutine = (FUNCPTR)((UINT32)routine | 1);
#else
    sysAuxClkRoutine = routine;
#endif /* CPU_FAMILY == ARM */

    return (OK);
    }

/*******************************************************************************
*
* sysAuxClkDisable - turn off auxiliary clock interrupts
*
* This routine disables auxiliary clock interrupts.
*
* RETURNS: N/A
*