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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* MVME147 port for TNI - Telecom Bretagne
* by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr)
* May 1996
*/
#include <rtems/btimer.h>
#include <bsp.h>
#define TIMER_INT_LEVEL 6
#define COUNTDOWN_VALUE 0
/* Allows 0.4096 second delay betwin ints */
/* Each tick is 6.25 us */
int Ttimer_val;
bool benchmark_timer_find_average_overhead;
rtems_isr timerisr(rtems_vector_number);
void benchmark_timer_initialize(void)
{
(void) set_vector(timerisr, TIMER_1_VECTOR, 0); /* install ISR */
Ttimer_val = 0; /* clear timer ISR count */
pcc->timer1_int_control = 0x00; /* Disable T1 Interr. */
pcc->timer1_preload = COUNTDOWN_VALUE;
/* write countdown preload value */
pcc->timer1_control = 0x00; /* load preload value */
pcc->timer1_control = 0x07; /* clear T1 overflow counter, enable counter */
pcc->timer1_int_control = TIMER_INT_LEVEL|0x08;
/* Enable Timer 1 and set its int. level */
}
#define AVG_OVERHEAD 0 /* No need to start/stop the timer to read
its value on the MVME147 PCC: reads are not
synchronized whith the counter updates*/
#define LEAST_VALID 10 /* Don't trust a value lower than this */
benchmark_timer_t benchmark_timer_read(void)
{
uint32_t total;
uint16_t counter_value;
counter_value = pcc->timer1_count; /* read the counter value */
total = ((Ttimer_val * 0x10000) + counter_value); /* in 6.25 us units */
/* DC note : just look at the assembly generated
to see gcc's impressive optimization ! */
return total;
}
void benchmark_timer_disable_subtracting_average_overhead(
bool find_flag
)
{
benchmark_timer_find_average_overhead = find_flag;
}
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