diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/efi68k/timer/timer.c')
-rw-r--r-- | c/src/lib/libbsp/m68k/efi68k/timer/timer.c | 141 |
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; -} |