Subversion Repositories openrisc_2011-10-31

/*

 * Timer_init()

 *

 * Use TIMER 1 and TIMER 2 for Timing Test Suite

 *

 * The hardware on the MC68360 makes these routines very simple.

 *

 * Based on the `gen68302' board support package, and covered by the

 * original distribution terms.

 *

 * W. Eric Norum

 * Saskatchewan Accelerator Laboratory

 * University of Saskatchewan

 * Saskatoon, Saskatchewan, CANADA

 * eric@skatter.usask.ca

 *

 *  $Id: timer.c,v 1.2 2001-09-27 12:00:08 chris Exp $

 */

/*

 *

 *  Input parameters:  NONE

 *

 *  Output parameters:  NONE

 *

 *  NOTE: It is important that the timer start/stop overhead be

 *        determined when porting or modifying this code.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 */

#include <rtems.h>

#include <bsp.h>

#include "m68360.h"

void

Timer_initialize (void)

{

        /*

         * Reset timers 1 and 2

         */

        m360.tgcr &= ~0x00FF;

        m360.tcn1 = 0;

        m360.tcn2 = 0;

        m360.ter1 = 0xFFFF;

        m360.ter2 = 0xFFFF;

        /*

         * Cascade timers 1 and 2

         */

        m360.tgcr |= 0x0080;

        /*

         * Configure timers 1 and 2 to a single 32-bit, 1 MHz timer.

         * HARDWARE:

         *      Change the `25' to match your processor clock

         */

        m360.tmr2 = ((25-1) << 8) | 0x2;

        m360.tmr1 = 0;

        /*

         * Start the timers

         */

        m360.tgcr |=  0x0011;

}

/*

 * Return timer value in microsecond units

 */

int

Read_timer (void)

{

        return *(rtems_unsigned32 *)&m360.tcn1;

}

/*

 * Empty function call used in loops to measure basic cost of looping

 * in Timing Test Suite.

 */

rtems_status_code

Empty_function (void)

{

        return RTEMS_SUCCESSFUL;

}

void

Set_find_average_overhead(rtems_boolean find_flag)

{

}