forked from Imagelibrary/rtems
93f4a90651
* at91rm9200/clock/clock.c, at91rm9200/dbgu/dbgu.c, at91rm9200/include/at91rm9200.h, at91rm9200/include/at91rm9200_dbgu.h, at91rm9200/include/at91rm9200_emac.h, at91rm9200/include/at91rm9200_gpio.h, at91rm9200/include/at91rm9200_mem.h, at91rm9200/include/at91rm9200_pmc.h, at91rm9200/include/bits.h, at91rm9200/irq/bsp_irq_asm.S, at91rm9200/irq/bsp_irq_init.c, at91rm9200/irq/irq.c, at91rm9200/irq/irq.h, at91rm9200/pmc/pmc.c, at91rm9200/timer/timer.c, mc9328mxl/clock/clockdrv.c, mc9328mxl/include/mc9328mxl.h, mc9328mxl/irq/bsp_irq_asm.S, mc9328mxl/irq/bsp_irq_init.c, mc9328mxl/irq/irq.c, mc9328mxl/irq/irq.h, mc9328mxl/timer/timer.c, s3c2400/clock/clockdrv.c, s3c2400/timer/timer.c: Correct license URL and/or fix mistake in copyright notice. Both of these mistakes appear to be from code submitted after these changes were made previously.
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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* Cogent CSB336 Timer driver
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*
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* This uses timer 2 for timing measurments.
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*
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* Copyright (c) 2004 Cogent Computer Systems
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* Written by Jay Monkman <jtm@lopingdog.com>
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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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*
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* http://www.rtems.com/license/LICENSE.
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*
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* Notes:
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* This file manages the benchmark timer used by the RTEMS Timing Test
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* Suite. Each measured time period is demarcated by calls to
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* Timer_initialize() and Read_timer(). Read_timer() usually returns
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* the number of microseconds since Timer_initialize() exitted.
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*
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* It is important that the timer start/stop overhead be determined
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* when porting or modifying this code.
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*
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* timer.c,v 1.1 2002/11/13 17:55:09 joel Exp
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*/
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#include <rtems.h>
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#include <bsp.h>
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#include <mc9328mxl.h>
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uint32_t g_start;
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uint32_t g_freq;
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rtems_boolean Timer_driver_Find_average_overhead;
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/*
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* Set up Timer 1
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*/
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void Timer_initialize( void )
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{
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MC9328MXL_TMR2_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 |
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MC9328MXL_TMR_TCTL_FRR |
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MC9328MXL_TMR_TCTL_TEN);
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/* set prescaler to 1 (register value + 1) */ \
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MC9328MXL_TMR2_TPRER = 0;
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/* get freq of counter in KHz */
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g_freq = get_perclk1_freq() / 1000;
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g_start = MC9328MXL_TMR2_TCN;
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}
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/*
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* The following controls the behavior of Read_timer().
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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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int Read_timer( void )
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{
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uint32_t t;
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unsigned long long total;
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t = MC9328MXL_TMR2_TCN;
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/*
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* Total is calculated by taking into account the number of timer overflow
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* interrupts since the timer was initialized and clicks since the last
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* interrupts.
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*/
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total = (t - g_start);
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/* convert to nanoseconds */
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total = (total * 1000)/ g_freq;
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if ( Timer_driver_Find_average_overhead == 1 ) {
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return (int) total;
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} else if ( total < LEAST_VALID ) {
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return 0;
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}
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/*
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* Somehow convert total into microseconds
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*/
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return (total - AVG_OVERHEAD);
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}
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/*
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* Empty function call used in loops to measure basic cost of looping
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* in Timing Test Suite.
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*/
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rtems_status_code Empty_function( void )
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{
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return RTEMS_SUCCESSFUL;
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}
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void Set_find_average_overhead(
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rtems_boolean find_flag
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)
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{
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Timer_driver_Find_average_overhead = find_flag;
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}
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