gen68360/btimer/btimer.c

0001 /*
0002  * Use TIMER 1 and TIMER 2 for Timing Test Suite
0003  * The hardware on the MC68360 makes these routines very simple.
0004  *
0005  *  NOTE: It is important that the timer start/stop overhead be
0006  *        determined when porting or modifying this code.
0007  *
0008  */
0009
0010 /*
0011  * Based on the `gen68302' board support package, and covered by the
0012  * original distribution terms.
0013  *
0014  * Copyright (c) 1996 Eric Norum <eric@norum.ca>
0015  *
0016  * COPYRIGHT (c) 1989-1999.
0017  * On-Line Applications Research Corporation (OAR).
0018  *
0019  * The license and distribution terms for this file may be
0020  * found in the file LICENSE in this distribution or at
0021  * http://www.rtems.org/license/LICENSE.
0022  */
0023
0024 #include <rtems.h>
0025 #include <rtems/btimer.h>
0026 #include <bsp.h>
0027 #include <rtems/m68k/m68360.h>
0028
0029 void
0030 benchmark_timer_initialize (void)
0031 {
0032     /*
0033      * Reset timers 1 and 2
0034      */
0035     m360.tgcr &= ~0x00FF;
0036     m360.tcn1 = 0;
0037     m360.tcn2 = 0;
0038     m360.ter1 = 0xFFFF;
0039     m360.ter2 = 0xFFFF;
0040
0041     /*
0042      * Cascade timers 1 and 2
0043      */
0044     m360.tgcr |= 0x0080;
0045
0046     /*
0047      * Configure timers 1 and 2 to a single 32-bit, 1 MHz timer.
0048      * HARDWARE:
0049      *  Change the `25' to match your processor clock
0050      */
0051     m360.tmr2 = ((25-1) << 8) | 0x2;
0052     m360.tmr1 = 0;
0053
0054     /*
0055      * Start the timers
0056      */
0057     m360.tgcr |=  0x0011;
0058 }
0059
0060 /*
0061  * Return timer value in microsecond units
0062  */
0063 uint32_t
0064 benchmark_timer_read (void)
0065 {
0066     unsigned short val;
0067
0068     val = m360.tcn1;
0069     return val;
0070 }
0071
0072 void
0073 benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
0074 {
0075 }