summaryrefslogtreecommitdiffstats
path: root/c/src/lib/libbsp/m68k/efi68k/timer/timer.c
diff options
context:
space:
mode:
Diffstat (limited to 'c/src/lib/libbsp/m68k/efi68k/timer/timer.c')
-rw-r--r--c/src/lib/libbsp/m68k/efi68k/timer/timer.c141
1 files changed, 0 insertions, 141 deletions
diff --git a/c/src/lib/libbsp/m68k/efi68k/timer/timer.c b/c/src/lib/libbsp/m68k/efi68k/timer/timer.c
deleted file mode 100644
index 3eb81fdefb..0000000000
--- a/c/src/lib/libbsp/m68k/efi68k/timer/timer.c
+++ /dev/null
@@ -1,141 +0,0 @@
-/* Timer_init()
- *
- * This routine initializes a timer in efi68k's DP8570A TCP
- *
- * Input parameters: NONE
- *
- * Output parameters: NONE
- *
- * NOTE: It is important that the timer start/stop overhead be
- * determined when porting or modifying this code.
- *
- * COPYRIGHT (c) 1989-1999.
- * On-Line Applications Research Corporation (OAR).
- *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rtems.com/license/LICENSE.
- *
- * $Id$
- */
-
-
-#include <bsp.h>
-#include <DP8570A.h>
-
-rtems_boolean Timer_driver_Find_average_overhead;
-
-extern rtems_isr Clock_isr();
-
-void Timer_initialize( void )
-{
- /* stop counter */
- *MSR = 0;
- *T0CR = 0;
-
- /*
- * Make sure isr is installed
- */
-
- set_vector( Clock_isr, TCP_ISR_LEVEL+24, 1);
-
- /* clear timer ISR count */
- Timer_interrupts = 0;
-
- /* load count (count down timer) */
- *MSR = 0;
- *T0_MSB = 0xff;
- *T0_LSB = 0xff;
-
- /* clear old interrupts */
- *MSR = T0;
-
- /* enable timer 0 interrupt */
- *MSR = RS;
- *ICR0 |= T0E;
-
- /*
- TSS = 1 starts the timer (timer resets on start)
- M1/0 = 0/1 rate generator
- C2/1/0 = 0/0/0 external clock (8MHz) (1/8 usec resolution)
- RD = 0 read data (latchs count)
- CHG = 0 hold
- */
- *MSR = 0;
- *T0CR = (TSS | M0);
-}
-
-/*
- * The following controls the behavior of Read_timer().
- *
- * FIND_AVG_OVERHEAD * instructs the routine to return the "raw" count.
- *
- * AVG_OVEREHAD is the overhead for starting and stopping the timer. It
- * is usually deducted from the number returned.
- *
- * LEAST_VALID is the lowest number this routine should trust. Numbers
- * below this are "noise" and zero is returned.
- */
-
-#define AVG_OVERHEAD 0 /* It typically takes X.X microseconds */
- /* (Y countdowns) to start/stop the timer. */
- /* This value is in microseconds. */
-#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */
-
-/*
- * Return timer value in 1/2-microsecond units
- */
-int Read_timer( void )
-{
- rtems_unsigned16 clicks;
- rtems_unsigned32 total;
- rtems_unsigned32 msb, lsb;
-
-
- /*
- * Read the timer and see how many clicks it has been since counter
- * rolled over.
- */
-
- *MSR = 0;
- *T0CR |= RD;
- /* must read MSB first */
- msb = *T0_MSB;
- lsb = *T0_LSB;
- clicks = 0xffff - ((msb << 8) | lsb);
-
- /*
- * Total is calculated by taking into account the number of timer overflow
- * interrupts since the timer was initialized and clicks since the last
- * interrupts.
- */
-
- total = (Timer_interrupts * 0x10000 + clicks + 4)/8; /* in micoseconds */
- /* ^^^ round to nearest int */
-
- if ( Timer_driver_Find_average_overhead == 1 )
- return total; /* in XXX microsecond units */
-
- if ( total < LEAST_VALID )
- return 0; /* below timer resolution */
-
- return (total - AVG_OVERHEAD);
-}
-
-
-/*
- * Empty function call used in loops to measure basic cost of looping
- * in Timing Test Suite.
- */
-
-rtems_status_code Empty_function(void)
-{
- return RTEMS_SUCCESSFUL;
-}
-
-void Set_find_average_overhead(
- rtems_boolean find_flag
-)
-{
- Timer_driver_Find_average_overhead = find_flag;
-}