forked from Imagelibrary/rtems
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* RTEMS generic mcf548x BSP
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*
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* The file contains the diagnostic timer code of generic MCF548x
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* BSP.
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*
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* Parts of the code has been derived from the "dBUG source code"
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* package Freescale is providing for M548X EVBs. The usage of
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* the modified or unmodified code and it's integration into the
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* generic mcf548x BSP has been done according to the Freescale
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* license terms.
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*
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* The Freescale license terms can be reviewed in the file
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*
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* LICENSE.Freescale
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*
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* The generic mcf548x BSP has been developed on the basic
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* structures and modules of the av5282 BSP.
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*/
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/*
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* Copyright (c) 2007 embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Timer Init
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*
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* Use the second slice timer (SLT1) as the diagnostic timer.
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*/
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#include <rtems.h>
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#include <rtems/btimer.h>
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#include <bsp.h>
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#include <mcf548x/mcf548x.h>
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bool benchmark_timer_find_average_overhead;
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static uint32_t microsecond_timer_value = 0;
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void benchmark_timer_initialize(void)
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{
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MCF548X_SLT_SLTCNT1 = 0xFFFFFFFF;
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MCF548X_SLT_SCR1 |= (MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN);
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}
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/*
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* Return timer value in microsecond units
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* XLB clock 100 MHz / 1us is equal to 100 counts
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*/
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uint32_t
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benchmark_timer_read(void)
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{
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microsecond_timer_value = (0xFFFFFFFF - MCF548X_SLT_SCNT1)/100;
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return microsecond_timer_value;
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}
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void
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benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
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{
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benchmark_timer_find_average_overhead = find_flag;
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}
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