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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2005 Jakub Jermar |
2 | * Copyright (C) 2005 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | /** @addtogroup ia64 |
29 | /** @addtogroup ia64 |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | /** @file |
32 | /** @file |
| 33 | */ |
33 | */ |
| 34 | 34 | ||
| 35 | /** Interval Timer driver. */ |
35 | /** Interval Timer driver. */ |
| 36 | 36 | ||
| 37 | #include <arch/drivers/it.h> |
37 | #include <arch/drivers/it.h> |
| 38 | #include <arch/ski/ski.h> |
38 | #include <arch/ski/ski.h> |
| 39 | #include <arch/interrupt.h> |
39 | #include <arch/interrupt.h> |
| 40 | #include <arch/register.h> |
40 | #include <arch/register.h> |
| 41 | #include <arch/asm.h> |
41 | #include <arch/asm.h> |
| 42 | #include <arch/barrier.h> |
42 | #include <arch/barrier.h> |
| 43 | #include <time/clock.h> |
43 | #include <time/clock.h> |
| - | 44 | #include <ddi/irq.h> |
|
| - | 45 | #include <ddi/device.h> |
|
| 44 | #include <arch.h> |
46 | #include <arch.h> |
| 45 | 47 | ||
| 46 | - | ||
| 47 | #define IT_SERVICE_CLOCKS 64 |
48 | #define IT_SERVICE_CLOCKS 64 |
| 48 | 49 | ||
| - | 50 | static irq_t it_irq; |
|
| - | 51 | ||
| - | 52 | static irq_ownership_t it_claim(void); |
|
| - | 53 | static void it_interrupt(irq_t *irq, void *arg, ...); |
|
| - | 54 | ||
| 49 | /** Initialize Interval Timer. */ |
55 | /** Initialize Interval Timer. */ |
| 50 | void it_init(void) |
56 | void it_init(void) |
| 51 | { |
57 | { |
| 52 | cr_itv_t itv; |
58 | cr_itv_t itv; |
| 53 | 59 | ||
| - | 60 | irq_initialize(&it_irq); |
|
| - | 61 | it_irq.inr = INTERRUPT_TIMER; |
|
| - | 62 | it_irq.devno = device_assign_devno(); |
|
| - | 63 | it_irq.claim = it_claim; |
|
| - | 64 | it_irq.handler = it_interrupt; |
|
| - | 65 | irq_register(&it_irq); |
|
| - | 66 | ||
| 54 | /* initialize Interval Timer external interrupt vector */ |
67 | /* initialize Interval Timer external interrupt vector */ |
| 55 | itv.value = itv_read(); |
68 | itv.value = itv_read(); |
| 56 | itv.vector = INTERRUPT_TIMER; |
69 | itv.vector = INTERRUPT_TIMER; |
| 57 | itv.m = 0; |
70 | itv.m = 0; |
| 58 | itv_write(itv.value); |
71 | itv_write(itv.value); |
| 59 | 72 | ||
| 60 | /* set Interval Timer Counter to zero */ |
73 | /* set Interval Timer Counter to zero */ |
| 61 | itc_write(0); |
74 | itc_write(0); |
| 62 | 75 | ||
| 63 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
76 | /* generate first Interval Timer interrupt in IT_DELTA ticks */ |
| 64 | itm_write(IT_DELTA); |
77 | itm_write(IT_DELTA); |
| 65 | 78 | ||
| 66 | /* propagate changes */ |
79 | /* propagate changes */ |
| 67 | srlz_d(); |
80 | srlz_d(); |
| 68 | } |
81 | } |
| 69 | 82 | ||
| - | 83 | /** Always claim ownership for this IRQ. |
|
| - | 84 | * |
|
| - | 85 | * Other devices are responsible to avoid using INR 0. |
|
| - | 86 | * |
|
| - | 87 | * @return Always IRQ_ACCEPT. |
|
| - | 88 | */ |
|
| - | 89 | irq_ownership_t it_claim(void) |
|
| - | 90 | { |
|
| - | 91 | return IRQ_ACCEPT; |
|
| - | 92 | } |
|
| 70 | 93 | ||
| 71 | /** Process Interval Timer interrupt. */ |
94 | /** Process Interval Timer interrupt. */ |
| 72 | void it_interrupt(void) |
95 | void it_interrupt(irq_t *irq, void *arg, ...) |
| 73 | { |
96 | { |
| 74 | int64_t c; |
97 | int64_t c; |
| 75 | int64_t m; |
98 | int64_t m; |
| 76 | 99 | ||
| 77 | eoi_write(EOI); |
100 | eoi_write(EOI); |
| 78 | 101 | ||
| 79 | m = itm_read(); |
102 | m = itm_read(); |
| 80 | 103 | ||
| 81 | while (1) { |
104 | while (1) { |
| 82 | c = itc_read(); |
105 | c = itc_read(); |
| 83 | c += IT_SERVICE_CLOCKS; |
106 | c += IT_SERVICE_CLOCKS; |
| 84 | 107 | ||
| 85 | m += IT_DELTA; |
108 | m += IT_DELTA; |
| 86 | if (m-c<0) |
109 | if (m - c < 0) |
| 87 | CPU->missed_clock_ticks++; |
110 | CPU->missed_clock_ticks++; |
| 88 | else |
111 | else |
| 89 | break; |
112 | break; |
| 90 | } |
113 | } |
| 91 | 114 | ||
| 92 | itm_write(m); |
115 | itm_write(m); |
| 93 | srlz_d(); /* propagate changes */ |
116 | srlz_d(); /* propagate changes */ |
| 94 | 117 | ||
| 95 | clock(); |
118 | clock(); |
| - | 119 | ||
| - | 120 | /* |
|
| - | 121 | * This one is a good candidate for moving to a separate |
|
| - | 122 | * kernel thread private to ski.c |
|
| - | 123 | */ |
|
| 96 | poll_keyboard(); |
124 | poll_keyboard(); |
| 97 | } |
125 | } |
| 98 | 126 | ||
| 99 | /** @} |
127 | /** @} |
| 100 | */ |
128 | */ |
| 101 | 129 | ||