path: root/c/src/lib/libbsp/m68k/gen68360/timer/timer.c

/*
 * 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
 *
 *  $Id$
 */

/*
 *
 *  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.rtems.com/license/LICENSE.
 */

#include <rtems.h>
#include <bsp.h>
#include <rtems/m68k/m68360.h>

void
benchmark_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
benchmark_timer_read (void)
{
	return *(uint32_t*)&m360.tcn1;
}

void
benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
{
}