[290da88f] | 1 | /* |
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[08311cc3] | 2 | * COPYRIGHT (c) 1989-1999. |
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[28fa54d9] | 3 | * On-Line Applications Research Corporation (OAR). |
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| 4 | * |
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[98e4ebf5] | 5 | * The license and distribution terms for this file may be |
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| 6 | * found in the file LICENSE in this distribution or at |
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[c499856] | 7 | * http://www.rtems.org/license/LICENSE. |
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[28fa54d9] | 8 | * |
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| 9 | * MVME147 port for TNI - Telecom Bretagne |
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| 10 | * by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr) |
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| 11 | * May 1996 |
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| 12 | */ |
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| 13 | |
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[26c17377] | 14 | #include <rtems/btimer.h> |
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[28fa54d9] | 15 | #include <bsp.h> |
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| 16 | |
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| 17 | #define TIMER_INT_LEVEL 6 |
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| 18 | |
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| 19 | #define COUNTDOWN_VALUE 0 |
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| 20 | /* Allows 0.4096 second delay betwin ints */ |
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| 21 | /* Each tick is 6.25 us */ |
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| 22 | |
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| 23 | int Ttimer_val; |
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[907bf4b8] | 24 | bool benchmark_timer_find_average_overhead; |
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[28fa54d9] | 25 | |
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[a89e5002] | 26 | rtems_isr_entry timerisr(rtems_vector_number); |
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[28fa54d9] | 27 | |
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[25c62b0] | 28 | void benchmark_timer_initialize(void) |
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[28fa54d9] | 29 | { |
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| 30 | (void) set_vector(timerisr, TIMER_1_VECTOR, 0); /* install ISR */ |
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| 31 | |
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| 32 | Ttimer_val = 0; /* clear timer ISR count */ |
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| 33 | pcc->timer1_int_control = 0x00; /* Disable T1 Interr. */ |
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| 34 | pcc->timer1_preload = COUNTDOWN_VALUE; |
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| 35 | /* write countdown preload value */ |
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| 36 | pcc->timer1_control = 0x00; /* load preload value */ |
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| 37 | pcc->timer1_control = 0x07; /* clear T1 overflow counter, enable counter */ |
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[6128a4a] | 38 | pcc->timer1_int_control = TIMER_INT_LEVEL|0x08; |
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[28fa54d9] | 39 | /* Enable Timer 1 and set its int. level */ |
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[6128a4a] | 40 | |
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[28fa54d9] | 41 | } |
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| 42 | |
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| 43 | #define AVG_OVERHEAD 0 /* No need to start/stop the timer to read |
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| 44 | its value on the MVME147 PCC: reads are not |
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| 45 | synchronized whith the counter updates*/ |
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| 46 | #define LEAST_VALID 10 /* Don't trust a value lower than this */ |
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| 47 | |
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[8fbe2e6] | 48 | benchmark_timer_t benchmark_timer_read(void) |
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[28fa54d9] | 49 | { |
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[24282451] | 50 | uint32_t total; |
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| 51 | uint16_t counter_value; |
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[28fa54d9] | 52 | |
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| 53 | counter_value = pcc->timer1_count; /* read the counter value */ |
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| 54 | |
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| 55 | total = ((Ttimer_val * 0x10000) + counter_value); /* in 6.25 us units */ |
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| 56 | /* DC note : just look at the assembly generated |
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| 57 | to see gcc's impressive optimization ! */ |
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| 58 | return total; |
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| 59 | |
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| 60 | } |
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| 61 | |
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[25c62b0] | 62 | void benchmark_timer_disable_subtracting_average_overhead( |
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[907bf4b8] | 63 | bool find_flag |
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[28fa54d9] | 64 | ) |
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| 65 | { |
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[25c62b0] | 66 | benchmark_timer_find_average_overhead = find_flag; |
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[28fa54d9] | 67 | } |
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