Rev 534 | Rev 1702 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 435 | jermar | 1 | /* |
| 2 | * Copyright (C) 2005 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | /** Interval Timer driver. */ |
||
| 30 | |||
| 31 | #include <arch/drivers/it.h> |
||
| 577 | palkovsky | 32 | #include <arch/ski/ski.h> |
| 435 | jermar | 33 | #include <arch/interrupt.h> |
| 34 | #include <arch/register.h> |
||
| 35 | #include <arch/asm.h> |
||
| 36 | #include <arch/barrier.h> |
||
| 37 | #include <time/clock.h> |
||
| 38 | |||
| 519 | vana | 39 | |
| 435 | jermar | 40 | /** Initialize Interval Timer. */ |
| 41 | void it_init(void) |
||
| 42 | { |
||
| 43 | cr_itv_t itv; |
||
| 44 | |||
| 45 | /* initialize Interval Timer external interrupt vector */ |
||
| 46 | itv.value = itv_read(); |
||
| 47 | itv.vector = INTERRUPT_TIMER; |
||
| 48 | itv.m = 0; |
||
| 49 | itv_write(itv.value); |
||
| 50 | |||
| 51 | /* set Interval Timer Counter to zero */ |
||
| 52 | itc_write(0); |
||
| 53 | |||
| 54 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
||
| 55 | itm_write(IT_DELTA); |
||
| 456 | jermar | 56 | |
| 57 | /* propagate changes */ |
||
| 435 | jermar | 58 | srlz_d(); |
| 59 | } |
||
| 60 | |||
| 61 | /** Process Interval Timer interrupt. */ |
||
| 62 | void it_interrupt(void) |
||
| 63 | { |
||
| 64 | eoi_write(EOI); |
||
| 65 | itm_write(itc_read() + IT_DELTA); /* program next interruption */ |
||
| 456 | jermar | 66 | srlz_d(); /* propagate changes */ |
| 435 | jermar | 67 | clock(); |
| 521 | vana | 68 | poll_keyboard(); |
| 435 | jermar | 69 | } |