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| Rev | Author | Line No. | Line |
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| 435 | jermar | 1 | /* |
| 2 | * Copyright (C) 2005 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** Interval Timer driver. */ |
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| 30 | |||
| 31 | #include <arch/drivers/it.h> |
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| 32 | #include <arch/interrupt.h> |
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| 33 | #include <arch/register.h> |
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| 34 | #include <arch/asm.h> |
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| 35 | #include <arch/barrier.h> |
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| 36 | #include <time/clock.h> |
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| 37 | |||
| 38 | /** Initialize Interval Timer. */ |
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| 39 | void it_init(void) |
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| 40 | { |
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| 41 | cr_itv_t itv; |
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| 42 | |||
| 43 | /* initialize Interval Timer external interrupt vector */ |
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| 44 | itv.value = itv_read(); |
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| 45 | itv.vector = INTERRUPT_TIMER; |
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| 46 | itv.m = 0; |
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| 47 | itv_write(itv.value); |
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| 48 | |||
| 49 | /* set Interval Timer Counter to zero */ |
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| 50 | itc_write(0); |
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| 51 | |||
| 52 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
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| 53 | itm_write(IT_DELTA); |
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| 456 | jermar | 54 | |
| 55 | /* propagate changes */ |
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| 435 | jermar | 56 | srlz_d(); |
| 57 | } |
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| 58 | |||
| 59 | /** Process Interval Timer interrupt. */ |
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| 60 | void it_interrupt(void) |
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| 61 | { |
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| 62 | eoi_write(EOI); |
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| 63 | itm_write(itc_read() + IT_DELTA); /* program next interruption */ |
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| 456 | jermar | 64 | srlz_d(); /* propagate changes */ |
| 435 | jermar | 65 | clock(); |
| 66 | } |