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- | 1 | /* |
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- | 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/drivers/keyboard.h> |
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- | 33 | #include <arch/interrupt.h> |
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- | 34 | #include <arch/register.h> |
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- | 35 | #include <arch/asm.h> |
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- | 36 | #include <arch/barrier.h> |
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- | 37 | #include <time/clock.h> |
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- | 38 | ||
- | 39 | ||
- | 40 | /** Initialize Interval Timer. */ |
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- | 41 | void it_init(void) |
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- | 42 | { |
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- | 43 | cr_itv_t itv; |
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- | 44 | ||
- | 45 | /* initialize Interval Timer external interrupt vector */ |
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- | 46 | itv.value = itv_read(); |
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- | 47 | itv.vector = INTERRUPT_TIMER; |
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- | 48 | itv.m = 0; |
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- | 49 | itv_write(itv.value); |
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- | 50 | ||
- | 51 | /* set Interval Timer Counter to zero */ |
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- | 52 | itc_write(0); |
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- | 53 | ||
- | 54 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
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- | 55 | itm_write(IT_DELTA); |
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- | 56 | ||
- | 57 | /* propagate changes */ |
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- | 58 | srlz_d(); |
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- | 59 | } |
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- | 60 | ||
- | 61 | /** Process Interval Timer interrupt. */ |
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- | 62 | void it_interrupt(void) |
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- | 63 | { |
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- | 64 | eoi_write(EOI); |
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- | 65 | itm_write(itc_read() + IT_DELTA); /* program next interruption */ |
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- | 66 | srlz_d(); /* propagate changes */ |
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- | 67 | clock(); |
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- | 68 | poll_keyboard(); |
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- | 69 | } |