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f7116eee20
Add AXI timer definitions and a BSP btimer implementation and install them in the microblaze_fpga BSP. Co-authored-by: Alex White <alex.white@oarcorp.com>
114 lines
4.2 KiB
C
114 lines
4.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2023 On-Line Applications Research Corporation (OAR)
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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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#include <bspopts.h>
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#include <bsp/microblaze-fdt-support.h>
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#include <bsp/microblaze-timer.h>
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#include <rtems.h>
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#include <rtems/btimer.h>
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static volatile Microblaze_Timer *mblaze_timer;
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bool benchmark_timer_find_average_overhead;
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void benchmark_timer_initialize ( void )
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{
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mblaze_timer = (volatile Microblaze_Timer *) try_get_prop_from_device_tree (
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"xlnx,xps-timer-1.00.a", "reg", BSP_MICROBLAZE_FPGA_TIMER_BASE );
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/* Set load register to 0 */
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mblaze_timer->tlr0 = 0;
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/* Reset the timer and interrupt */
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mblaze_timer->tcsr0 =
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MICROBLAZE_TIMER_TCSR0_T0INT | MICROBLAZE_TIMER_TCSR0_LOAD0;
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/* Release the reset */
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mblaze_timer->tcsr0 = 0;
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/*
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* Enable interrupt, auto reload mode, external interrupt signal,
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* and down counter
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*/
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mblaze_timer->tcsr0 =
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MICROBLAZE_TIMER_TCSR0_ARHT0 | MICROBLAZE_TIMER_TCSR0_ENIT0 |
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MICROBLAZE_TIMER_TCSR0_GENT0 | MICROBLAZE_TIMER_TCSR0_UDT0;
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uint64_t us_per_tick = rtems_configuration_get_microseconds_per_tick ();
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uint32_t counter_frequency_in_hz =
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try_get_prop_from_device_tree ( "xlnx,xps-timer-1.00.a",
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"clock-frequency",
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BSP_MICROBLAZE_FPGA_TIMER_FREQUENCY );
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uint32_t counter_ticks_per_clock_tick =
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( counter_frequency_in_hz * us_per_tick ) / 1000000;
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/* Set a reset value for the timer counter */
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mblaze_timer->tlr0 = counter_ticks_per_clock_tick;
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uint32_t control_status_reg = mblaze_timer->tcsr0;
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/* Load the reset value into the counter register */
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mblaze_timer->tcsr0 = MICROBLAZE_TIMER_TCSR0_LOAD0;
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/* Enable the timer */
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mblaze_timer->tcsr0 = control_status_reg | MICROBLAZE_TIMER_TCSR0_ENT0;
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}
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/*
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* The following controls the behavior of benchmark_timer_read().
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*
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* AVG_OVEREHAD is the overhead for starting and stopping the timer. It
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* is usually deducted from the number returned.
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*
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* LEAST_VALID is the lowest number this routine should trust. Numbers
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* below this are "noise" and zero is returned.
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*/
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#define AVG_OVERHEAD 0 /* It typically takes X.X microseconds */
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/* (Y countdowns) to start/stop the timer. */
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/* This value is in microseconds. */
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#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */
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benchmark_timer_t benchmark_timer_read ( void )
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{
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uint32_t ticks;
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uint32_t total;
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ticks = 1000000 - mblaze_timer->tcr0;
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total = ticks / ( BSP_MICROBLAZE_FPGA_TIMER_FREQUENCY / 1000000 );
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if ( benchmark_timer_find_average_overhead == true )
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return total; /* in XXX microsecond units */
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else
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{
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if ( total < LEAST_VALID )
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return 0; /* below timer resolution */
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return ( total - AVG_OVERHEAD );
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}
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}
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void 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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