[457b6ae] | 1 | /* |
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| 2 | * Timer_init() |
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| 3 | * |
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| 4 | * Use TIMER 1 and TIMER 2 for Timing Test Suite |
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| 5 | * |
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| 6 | * The hardware on the MC68360 makes these routines very simple. |
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| 7 | * |
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| 8 | * Based on the `gen68302' board support package, and covered by the |
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| 9 | * original distribution terms. |
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| 10 | * |
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| 11 | * W. Eric Norum |
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| 12 | * Saskatchewan Accelerator Laboratory |
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| 13 | * University of Saskatchewan |
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| 14 | * Saskatoon, Saskatchewan, CANADA |
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| 15 | * eric@skatter.usask.ca |
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| 16 | * |
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| 17 | * $Id$ |
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| 18 | */ |
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| 19 | |
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| 20 | /* |
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| 21 | * |
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| 22 | * Input parameters: NONE |
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| 23 | * |
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| 24 | * Output parameters: NONE |
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| 25 | * |
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| 26 | * NOTE: It is important that the timer start/stop overhead be |
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| 27 | * determined when porting or modifying this code. |
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| 28 | * |
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| 29 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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| 30 | * On-Line Applications Research Corporation (OAR). |
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| 31 | * All rights assigned to U.S. Government, 1994. |
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| 32 | * |
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| 33 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 34 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 35 | * notice must appear in all copies of this file and its derivatives. |
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| 36 | */ |
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| 37 | |
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| 38 | #include <rtems.h> |
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| 39 | #include <bsp.h> |
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[bdf531ee] | 40 | #include "m68360.h" |
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[457b6ae] | 41 | |
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| 42 | void |
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| 43 | Timer_initialize (void) |
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| 44 | { |
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| 45 | /* |
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| 46 | * Reset timers 1 and 2 |
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| 47 | */ |
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| 48 | m360.tgcr &= ~0x00FF; |
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| 49 | m360.tcn1 = 0; |
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| 50 | m360.tcn2 = 0; |
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| 51 | m360.ter1 = 0xFFFF; |
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| 52 | m360.ter2 = 0xFFFF; |
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| 53 | |
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| 54 | /* |
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| 55 | * Cascade timers 1 and 2 |
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| 56 | */ |
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| 57 | m360.tgcr |= 0x0080; |
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| 58 | |
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| 59 | /* |
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| 60 | * Configure timers 1 and 2 to a single 32-bit, 1 MHz timer. |
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| 61 | * HARDWARE: |
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| 62 | * Change the `25' to match your processor clock |
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| 63 | */ |
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| 64 | m360.tmr2 = ((25-1) << 8) | 0x2; |
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| 65 | m360.tmr1 = 0; |
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| 66 | |
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| 67 | /* |
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| 68 | * Start the timers |
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| 69 | */ |
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| 70 | m360.tgcr |= 0x0011; |
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| 71 | } |
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| 72 | |
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| 73 | /* |
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| 74 | * Return timer value in microsecond units |
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| 75 | */ |
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| 76 | int |
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| 77 | Read_timer (void) |
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| 78 | { |
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| 79 | return *(rtems_unsigned32 *)&m360.tcn1; |
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| 80 | } |
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| 81 | |
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| 82 | /* |
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| 83 | * Empty function call used in loops to measure basic cost of looping |
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| 84 | * in Timing Test Suite. |
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| 85 | */ |
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| 86 | rtems_status_code |
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| 87 | Empty_function (void) |
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| 88 | { |
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| 89 | return RTEMS_SUCCESSFUL; |
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| 90 | } |
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| 91 | |
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| 92 | void |
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| 93 | Set_find_average_overhead(rtems_boolean find_flag) |
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| 94 | { |
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| 95 | } |
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