m68360timer.c

IXP425的BSP代码

/* m68360Timer.c - Motorola MC68360 timer library */

/* Copyright 1984-1997 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
01f,13may97,map  updated *Enable(), and *Disable() to use STP bits [SPR# 8473]
                 fixed prescaler use in sysTimestamp*() [SPR# 8433]
01e,31oct96,wlf  doc: cleanup.
01d,28may96,dat  fixed SPR #5430, fixed clearing of status flags
01c,12nov94,kdl	 made include of timestampDev.h conditional on INCLUDE_TIMESTAMP
01b,10jun94,jds	 included timestamp driver functionality
01a,01aug93,dzb  derived from version 01c of timer/m68302Timer.c.
*/

/*
DESCRIPTION
This library contains routines to manipulate the timer functions on the
Motorola MC68360.  This library handles both the system clock and the auxiliary
clock functions.

The macros SYS_CLK_RATE_MIN, SYS_CLK_RATE_MAX, AUX_CLK_RATE_MIN, and
AUX_CLK_RATE_MAX must be defined to provide parameter checking for the
sys[Aux]ClkRateSet() routines.
*/


/* locals */

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

LOCAL FUNCPTR sysAuxClkRoutine	= NULL; /* routine to call on clock interrupt */
LOCAL int sysAuxClkArg		= NULL; /* its argument */
LOCAL int sysAuxClkRunning	= FALSE;
LOCAL int auxClkConnected	= FALSE;
LOCAL int auxClkTicksPerSecond	= 60;

#ifdef  INCLUDE_TIMESTAMP

#include "drv/timer/timestampDev.h"

LOCAL BOOL    sysTimestampRunning  = FALSE;     /* if running - TRUE */
LOCAL FUNCPTR sysTimestampRoutine  = NULL;      /* user rollover routine */
LOCAL int     sysTimestampArg      = NULL;      /* arg to user routine */

#endif  /* INCLUDE_TIMESTAMP */

/*******************************************************************************
*
* sysClkInt - system clock interrupt handler
*
* This routine handles the system clock interrupt.  It calls a user routine
* if one was specified by the routine sysClkConnect().
*/

LOCAL void sysClkInt (void)
    {
    *M360_CPM_TER1(SYS_TMR_BASE) |= TMR_TER_REF;     /* clear event register */
    *M360_CPM_CISR(SYS_TMR_BASE) = CPIC_CIXR_TMR1;  /* clear in-service bit */

    if (sysClkRoutine != NULL)
        (*sysClkRoutine) (sysClkArg);
    }

/*******************************************************************************
*
* sysAuxClkInt - auxiliary clock interrupt handler
*
* This routine handles the auxiliary clock interrupt.  It calls a user routine
* if one was specified by the routine sysAuxClkConnect().
*/

LOCAL void sysAuxClkInt (void)
    {
    *M360_CPM_TER2(AUX_TMR_BASE) |= TMR_TER_REF;     /* clear event register */
    *M360_CPM_CISR(AUX_TMR_BASE) = CPIC_CIXR_TMR2;  /* clear in-service bit */

    if (sysAuxClkRoutine != NULL)
        (*sysAuxClkRoutine) (sysAuxClkArg);
    }

/*******************************************************************************
*
* 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          */
    )
    {
    sysHwInit2 ();	/* XXX for now -- needs to be in usrConfig.c */

    sysClkRoutine   = routine;
    sysClkArg       = arg;
    sysClkConnected = TRUE;

    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)
	{
	*M360_CPM_CIMR(SYS_TMR_BASE) &= ~CPIC_CIXR_TMR1; /* disable interrupt */
	*M360_CPM_TGCR(SYS_TMR_BASE) |= TMR_TGCR_STP1;	 /* stop the timer */

	sysClkRunning = FALSE;			/* clock is no longer running */
	}
    }

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

void sysClkEnable (void)
    {
    UINT32  tempDiv = SYS_CPU_FREQ / (sysClkTicksPerSecond << 8);

    if ((!sysClkRunning) && (tempDiv <= USHRT_MAX * 16))
	{
        /* start, reset, but disable timer 1 */
        
        *M360_CPM_TGCR(SYS_TMR_BASE) &= ~(TMR_TGCR_RST1 | TMR_TGCR_STP1);

        *M360_CPM_TCN1(SYS_TMR_BASE) = 0x0;		/* reset timer count */

	if (tempDiv <= USHRT_MAX)
	    {
            *M360_CPM_TRR1(SYS_TMR_BASE) = (UINT16) tempDiv;
            *M360_CPM_TMR1(SYS_TMR_BASE) = TMR_TMR_ICLK_CLK | TMR_TMR_ORI |
                                           TMR_TMR_FRR | (TMR_TMR_PS & 0xff00);
	    }
	else
	    {
            *M360_CPM_TRR1(SYS_TMR_BASE) = (UINT16) (tempDiv / 16);
            *M360_CPM_TMR1(SYS_TMR_BASE) = TMR_TMR_ICLK_CLK16 | TMR_TMR_ORI |
                                           TMR_TMR_FRR | (TMR_TMR_PS & 0xff00);
	    }
 
        *M360_CPM_TER1(SYS_TMR_BASE) = 0xffff;		/* clear event */
        *M360_CPM_CIMR(SYS_TMR_BASE) |= CPIC_CIXR_TMR1; /* unmask interupt */

        *M360_CPM_TGCR(SYS_TMR_BASE) |= TMR_TGCR_RST1;	/* enable timer 1 */

	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 does not
* enable system clock interrupts.  Normally, 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);
    }

/*******************************************************************************
*
* 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   = routine;
    sysAuxClkArg       = arg;
    auxClkConnected    = TRUE;

    return (OK);
    }

/*******************************************************************************
*
* sysAuxClkDisable - turn off auxiliary clock interrupts
*
* This routine disables auxiliary clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkEnable()
*/

void sysAuxClkDisable (void)
    {
    if (sysAuxClkRunning)
	{
	*M360_CPM_CIMR(AUX_TMR_BASE) &= ~CPIC_CIXR_TMR2; /* disable interrupt */
	*M360_CPM_TGCR(AUX_TMR_BASE) |= TMR_TGCR_STP2;	 /* stop the timer */

	sysAuxClkRunning = FALSE;		/* clock is no longer running */
	}
    }

/*******************************************************************************
*
* sysAuxClkEnable - turn on auxiliary clock interrupts
*
* This routine enables auxiliary clock interrupts.
*
* RETURNS: N/A