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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* RTEMS generic mcf548x BSP
*
* The file contains the diagnostic timer code of generic MCF548x
* BSP.
*
* Parts of the code has been derived from the "dBUG source code"
* package Freescale is providing for M548X EVBs. The usage of
* the modified or unmodified code and it's integration into the
* generic mcf548x BSP has been done according to the Freescale
* license terms.
*
* The Freescale license terms can be reviewed in the file
*
* LICENSE.Freescale
*
* The generic mcf548x BSP has been developed on the basic
* structures and modules of the av5282 BSP.
*/
/*
* Copyright (c) 2007 embedded brains GmbH. All rights reserved.
*
* 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.
*/
/*
* Timer Init
*
* Use the second slice timer (SLT1) as the diagnostic timer.
*/
#include <rtems.h>
#include <rtems/btimer.h>
#include <bsp.h>
#include <mcf548x/mcf548x.h>
bool benchmark_timer_find_average_overhead;
static uint32_t microsecond_timer_value = 0;
void benchmark_timer_initialize(void)
{
MCF548X_SLT_SLTCNT1 = 0xFFFFFFFF;
MCF548X_SLT_SCR1 |= (MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN);
}
/*
* Return timer value in microsecond units
* XLB clock 100 MHz / 1us is equal to 100 counts
*/
uint32_t
benchmark_timer_read(void)
{
microsecond_timer_value = (0xFFFFFFFF - MCF548X_SLT_SCNT1)/100;
return microsecond_timer_value;
}
void
benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
{
benchmark_timer_find_average_overhead = find_flag;
}
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