forked from Imagelibrary/rtems
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*===============================================================*\
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| Project: RTEMS TQM8xx BSP |
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+-----------------------------------------------------------------+
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| This file has been adapted to MPC8xx by |
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| Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> |
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| Copyright (c) 2008 |
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| Embedded Brains GmbH |
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| Obere Lagerstr. 30 |
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| D-82178 Puchheim |
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| Germany |
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| rtems@embedded-brains.de |
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| See the other copyright notice below for the original parts. |
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+-----------------------------------------------------------------+
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| The license and distribution terms for this file may be |
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| found in the file LICENSE in this distribution or at |
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| |
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| http://www.rtems.org/license/LICENSE. |
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+-----------------------------------------------------------------+
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| this file contains the console driver |
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\*===============================================================*/
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/*
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* benchmark_timer_initialize()
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*
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* Use TIMER 1 and TIMER 2 for Timing Test Suite
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*
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* this is derived from "timer.c" available in the m68k/gen68360 BSP
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* adapted by Thomas Doerfler <Thomas.Doerfler@embedded-brains.de>
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*/
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/*
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*
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* Input parameters: NONE
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*
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* Output parameters: NONE
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*
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* NOTE: It is important that the timer start/stop overhead be
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* determined when porting or modifying this code.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <rtems.h>
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#include <bsp.h>
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#include <rtems/btimer.h>
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#include <mpc8xx.h>
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bool benchmark_timer_find_average_overhead;
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void
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benchmark_timer_initialize (void)
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{
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/*
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* Reset timers 1 and 2
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*/
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m8xx.tgcr &= ~0x00FF;
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m8xx.tcn1 = 0;
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m8xx.tcn2 = 0;
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m8xx.ter1 = 0xFFFF;
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m8xx.ter2 = 0xFFFF;
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/*
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* Cascade timers 1 and 2
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*/
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m8xx.tgcr |= M8xx_TGCR_CAS2;
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/*
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* Configure timers 1 and 2 to a single 32-bit, BUS_clock timer.
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*/
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m8xx.tmr2 = (0 << 8) | 0x2;
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m8xx.tmr1 = 0;
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/*
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* Start the timers
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*/
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m8xx.tgcr |= 0x0011;
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}
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/*
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* Return timer value in microsecond units
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*/
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benchmark_timer_t benchmark_timer_read(void)
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{
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uint32_t retval;
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retval = *(uint32_t*)&m8xx.tcn1;
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retval = retval * 1000000LL / BSP_bus_frequency;
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return retval;
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}
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void benchmark_timer_disable_subtracting_average_overhead(
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bool find_flag
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)
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{
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benchmark_timer_find_average_overhead = find_flag;
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}
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