forked from Imagelibrary/rtems
226d48d826
Some register layout definitions for LEON3 reside in ambapp.h which does not really has anything to do with device registers. The register structures has been incorrectly named LEON3_*, the cores are not only used on LEON3 but on LEON4 and perhaps on LEON5 when that day comes. Some structures has been renamed according to the GRLIB core name instead, which CPU that actually use it is not relevant. Drivers has been updated with the new names. Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/* timer.c
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*
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* This file implements a benchmark timer using timer 2.
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*
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* COPYRIGHT (c) 1989-1998.
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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.com/license/LICENSE.
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*
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* Ported to LEON implementation of the SPARC by On-Line Applications
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* Research Corporation (OAR) under contract to the European Space
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* Agency (ESA).
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*
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* LEON modifications of respective RTEMS file: COPYRIGHT (c) 1995.
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* European Space Agency.
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*/
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#include <bsp.h>
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#include <rtems/btimer.h>
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#if defined(RTEMS_MULTIPROCESSING)
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#define LEON3_TIMER_INDEX \
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((rtems_configuration_get_user_multiprocessing_table()) ? \
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(rtems_configuration_get_user_multiprocessing_table()->node) - 1 : 1)
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#else
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#define LEON3_TIMER_INDEX 0
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#endif
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bool benchmark_timer_find_average_overhead;
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bool benchmark_timer_is_initialized = false;
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extern volatile struct gptimer_regs *LEON3_Timer_Regs;
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void benchmark_timer_initialize(void)
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{
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/*
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* Timer runs long and accurate enough not to require an interrupt.
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*/
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if (LEON3_Timer_Regs) {
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if ( benchmark_timer_is_initialized == false ) {
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/* approximately 1 us per countdown */
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LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].reload = 0xffffff;
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LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].value = 0xffffff;
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} else {
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benchmark_timer_is_initialized = true;
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}
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LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].ctrl = LEON3_GPTIMER_EN | LEON3_GPTIMER_LD;
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}
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}
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#define AVG_OVERHEAD 3 /* It typically takes 3.0 microseconds */
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/* to start/stop the timer. */
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#define LEAST_VALID 2 /* Don't trust a value lower than this */
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uint32_t benchmark_timer_read(void)
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{
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uint32_t total;
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if (LEON3_Timer_Regs) {
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total = LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].value;
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total = 0xffffff - total;
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if ( benchmark_timer_find_average_overhead == true )
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return total; /* in one microsecond units */
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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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return 0;
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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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