dga001timer.c

IXP425的BSP代码

/* dga001Timer.c - DGA-001 Timer library */

/* Copyright 1994-1998 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
01o,23apr98,hk   added tkt's counter glitch filter to sysTimestamp{Lock}.
01n,09dec97,hk   changed TICK_FREQ to DGA_TICK_FREQ. added sys{Aux}ClkDisable()
                 in sys{Aux}ClkConnect(). reviewed timestamp driver code.
01m,12jul97,hk   changed inclusion of multi/dga001.h to timer/dga001Timer.h.
01l,06may97,hk   added TSTAMP_USE_DGA001_TT1. added default TIMESTAMP_LEVEL.
01k,04may97,hk   merged in timestamp driver.
01f,18apr97,st   moved initialization of Timerstamp-Timer in
                 sysTimestampConnect() to sysTimestampEnable().
01i,06mar97,st   added support for timestamp function for windview
01h,10nov95,hk   followed dga001.h-01j macro name changes.
01g,09nov95,hk   added more type casting. followed dga001.h 01i.
01f,08nov95,hk   changed dga001.h directory to drv/multi/.
01e,08jun95,hk   changed sysClkInt/sysAuxClkInt for CSR20 header mod.
01d,06jun95,hk   renamed timer select macros.
01c,28feb95,hk   changed sysClkConnect() and sysAuxClkConnect() to conform the
		 corrected IV_ defines in ivSh.h-01e. copyright 1995.
01b,09nov94,sa   fixed.
01a,08nov94,sa   derived from 01f of sh7604Timer.c.
*/

/*
DESCRIPTION
This library contains routines to manipulate the timer functions on the
DGA-001 chip with a board-independant interface.  This library handles both
the system clock, auxiliary clock, and timestamp timer facilities.

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.

To include the timestamp timer facility, the macro INCLUDE_TIMESTAMP must be
defined.  The macro TIMESTAMP_LEVEL must be defined to provide the timestamp
timer's interrupt level.
*/

#include "drv/timer/timerDev.h"
#include "drv/timer/timestampDev.h"
#include "drv/timer/dga001Timer.h"
#include "config.h"

/* Locals */ 

#define DGA_TICK_FREQ	1000000			/* 1MHz */

#ifdef	SYSCLK_USE_DGA001_TT0
LOCAL int     sysClkTicksPerSecond = 60; 
LOCAL BOOL    sysClkRunning        = FALSE; 
LOCAL FUNCPTR sysClkRoutine        = NULL; 
LOCAL int     sysClkArg            = NULL; 
LOCAL BOOL    sysClkConnected      = FALSE; 
#endif

#ifdef	AUXCLK_USE_DGA001_TT1
LOCAL int     auxClkTicksPerSecond = 60; 
LOCAL BOOL    sysAuxClkRunning     = FALSE; 
LOCAL FUNCPTR sysAuxClkRoutine     = NULL; 
LOCAL int     sysAuxClkArg         = NULL;
LOCAL BOOL    auxClkConnected      = FALSE; 
#endif

#if defined(INCLUDE_TIMESTAMP) && defined(TSTAMP_USE_DGA001_TT1)
LOCAL BOOL    sysTimestampRunning  = FALSE;	/* running flag */
LOCAL FUNCPTR sysTimestampRoutine  = NULL;	/* user rollover routine */
LOCAL int     sysTimestampArg      = NULL;	/* arg to user routine */
#ifndef	TIMESTAMP_LEVEL
#error TIMESTAMP_LEVEL is not defined
#endif /* ! TIMESTAMP_LEVEL */
#endif /* INCLUDE_TIMESTAMP && TSTAMP_USE_DGA001_TT1 */

#ifdef	SYSCLK_USE_DGA001_TT0
/*******************************************************************************
*
* sysClkInt - handle system clock interrupts
*
* This routine handles system clock interrupts.
*/

LOCAL void sysClkInt (void)
    {
    if ( !(*DGA_CSR20 & CSR20_TT0IRQ))
	return;

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

    *DGA_CSR23 = (UINT32)CSR23_TT0ICL;		/* clear interrupt */
    }

/*******************************************************************************
*
* 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 called at each system clock interrupt */
    int arg             /* argument with which to call routine           */
    )
    {
    sysHwInit2 ();      /* XXX for now -- needs to be in usrConfig.c */

    sysClkDisable ();

    if (intConnect (INT_VEC_TT0, sysClkInt, NULL) != OK)
	return (ERROR);

    sysClkConnected = TRUE;
    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)
	{
	*DGA_CSR21 &= (UINT32) ~CSR21_TT0IEN;	/* disable interrupt */
	*DGA_CSR12 &= (UINT32) ~CSR12_TT0CEN;	/* stop timer */

	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)
	{
	*DGA_CSR12  = (UINT32) NULL;		/* stop timer */
	*DGA_CSR13  = (UINT32) NULL;		/* clear count */
	*DGA_CSR23  = (UINT32) CSR23_TT0ICL;	/* clear interrupt */
	*DGA_CSR21 |= (UINT32) CSR21_TT0IEN;	/* enable interrupt */

	/* load compare register with the number of micro seconds and 
         * start the counter.
	 */
	*DGA_CSR12 = (UINT32)((DGA_TICK_FREQ / sysClkTicksPerSecond - 1) | 
				CSR12_TT0CEN);
	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);
    }
#endif	/* SYSCLK_USE_DGA001_TT0 */

#ifdef	AUXCLK_USE_DGA001_TT1
/*******************************************************************************
*
* sysAuxClkInt - handle auxiliary clock interrupts
*/
 
LOCAL void sysAuxClkInt (void)
    {
    if ( !(*DGA_CSR20 & CSR20_TT1IRQ))
	return;

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

    *DGA_CSR23 = (UINT32)CSR23_TT1ICL;		/* reset clock interrupt */
    }

/*******************************************************************************
*
* 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 */
    )
    {
    sysAuxClkDisable ();

    if (intConnect (INT_VEC_TT1, sysAuxClkInt, NULL) != OK)
	return (ERROR);

    auxClkConnected  = TRUE;
    sysAuxClkRoutine = routine;
    sysAuxClkArg     = arg;
 
    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)
	{
	*DGA_CSR21 &= (UINT32) ~CSR21_TT1IEN;	/* disable interrupt */
	*DGA_CSR14 &= (UINT32) ~CSR14_TT1CEN;	/* stop timer */

	sysAuxClkRunning = FALSE;
	}
    }

/*******************************************************************************
*