[41c9282] | 1 | /* timer.c |
---|
| 2 | * |
---|
| 3 | * This file implements a benchmark timer using timer 2. |
---|
| 4 | * |
---|
| 5 | * COPYRIGHT (c) 1989-1998. |
---|
| 6 | * On-Line Applications Research Corporation (OAR). |
---|
| 7 | * |
---|
| 8 | * The license and distribution terms for this file may be |
---|
| 9 | * found in the file LICENSE in this distribution or at |
---|
| 10 | * http://www.rtems.com/license/LICENSE. |
---|
| 11 | * |
---|
| 12 | * Ported to LEON implementation of the SPARC by On-Line Applications |
---|
| 13 | * Research Corporation (OAR) under contract to the European Space |
---|
| 14 | * Agency (ESA). |
---|
| 15 | * |
---|
| 16 | * LEON modifications of respective RTEMS file: COPYRIGHT (c) 1995. |
---|
| 17 | * European Space Agency. |
---|
| 18 | * |
---|
| 19 | * $Id$ |
---|
| 20 | */ |
---|
| 21 | |
---|
| 22 | |
---|
| 23 | #include <bsp.h> |
---|
| 24 | |
---|
[7f3c6ce] | 25 | #if defined(RTEMS_MULTIPROCESSING) |
---|
| 26 | #define LEON3_TIMER_INDEX \ |
---|
[2088669] | 27 | ((rtems_configuration_get_user_multiprocessing_table()) ? \ |
---|
[7f3c6ce] | 28 | (rtems_configuration_get_user_multiprocessing_table()->node) - 1 : 1) |
---|
| 29 | #else |
---|
| 30 | #define LEON3_TIMER_INDEX 0 |
---|
| 31 | #endif |
---|
[0b83afe9] | 32 | |
---|
[41c9282] | 33 | rtems_boolean Timer_driver_Find_average_overhead; |
---|
| 34 | |
---|
| 35 | rtems_boolean Timer_driver_Is_initialized = FALSE; |
---|
| 36 | |
---|
| 37 | extern volatile LEON3_Timer_Regs_Map *LEON3_Timer_Regs; |
---|
| 38 | |
---|
[292f01c] | 39 | void Timer_initialize(void) |
---|
[41c9282] | 40 | { |
---|
| 41 | /* |
---|
| 42 | * Timer runs long and accurate enough not to require an interrupt. |
---|
| 43 | */ |
---|
| 44 | if (LEON3_Timer_Regs) { |
---|
| 45 | if ( Timer_driver_Is_initialized == FALSE ) { |
---|
| 46 | /* approximately 1 us per countdown */ |
---|
[0b83afe9] | 47 | LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].reload = 0xffffff; |
---|
| 48 | LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].value = 0xffffff; |
---|
[41c9282] | 49 | } else { |
---|
| 50 | Timer_driver_Is_initialized = TRUE; |
---|
| 51 | } |
---|
[0b83afe9] | 52 | LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].conf = LEON3_GPTIMER_EN | LEON3_GPTIMER_LD; |
---|
[41c9282] | 53 | } |
---|
| 54 | } |
---|
| 55 | |
---|
| 56 | #define AVG_OVERHEAD 3 /* It typically takes 3.0 microseconds */ |
---|
| 57 | /* to start/stop the timer. */ |
---|
| 58 | #define LEAST_VALID 2 /* Don't trust a value lower than this */ |
---|
| 59 | |
---|
[292f01c] | 60 | int Read_timer(void) |
---|
[41c9282] | 61 | { |
---|
[1408ea8d] | 62 | uint32_t total; |
---|
[41c9282] | 63 | |
---|
| 64 | if (LEON3_Timer_Regs) { |
---|
[0b83afe9] | 65 | total = LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].value; |
---|
[41c9282] | 66 | |
---|
| 67 | total = 0xffffff - total; |
---|
| 68 | |
---|
| 69 | if ( Timer_driver_Find_average_overhead == 1 ) |
---|
| 70 | return total; /* in one microsecond units */ |
---|
| 71 | |
---|
| 72 | if ( total < LEAST_VALID ) |
---|
| 73 | return 0; /* below timer resolution */ |
---|
[0b83afe9] | 74 | |
---|
[41c9282] | 75 | return total - AVG_OVERHEAD; |
---|
| 76 | } |
---|
| 77 | return 0; |
---|
| 78 | } |
---|
| 79 | |
---|
| 80 | rtems_status_code Empty_function( void ) |
---|
| 81 | { |
---|
| 82 | return RTEMS_SUCCESSFUL; |
---|
| 83 | } |
---|
| 84 | |
---|
| 85 | void Set_find_average_overhead( |
---|
| 86 | rtems_boolean find_flag |
---|
| 87 | ) |
---|
| 88 | { |
---|
| 89 | Timer_driver_Find_average_overhead = find_flag; |
---|
| 90 | } |
---|