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1da177e4 LT |
1 | |
2 | /* | |
3 | ********************************************************************** | |
4 | * timer.c | |
5 | * Copyright (C) 1999, 2000 Creative Labs, inc. | |
6 | * | |
7 | ********************************************************************** | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation; either version 2 of | |
12 | * the License, or (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public | |
20 | * License along with this program; if not, write to the Free | |
21 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, | |
22 | * USA. | |
23 | * | |
24 | ********************************************************************** | |
25 | */ | |
26 | ||
27 | /* 3/6/2000 Improved support for different timer delays Rui Sousa */ | |
28 | ||
29 | /* 4/3/2000 Implemented timer list using list.h Rui Sousa */ | |
30 | ||
31 | #include "hwaccess.h" | |
32 | #include "8010.h" | |
33 | #include "irqmgr.h" | |
34 | #include "timer.h" | |
35 | ||
36 | /* Try to schedule only once per fragment */ | |
37 | ||
38 | void emu10k1_timer_irqhandler(struct emu10k1_card *card) | |
39 | { | |
40 | struct emu_timer *t; | |
41 | struct list_head *entry; | |
42 | ||
43 | spin_lock(&card->timer_lock); | |
44 | ||
45 | list_for_each(entry, &card->timers) { | |
46 | t = list_entry(entry, struct emu_timer, list); | |
47 | ||
48 | if (t->state & TIMER_STATE_ACTIVE) { | |
49 | t->count++; | |
50 | if (t->count == t->count_max) { | |
51 | t->count = 0; | |
52 | tasklet_hi_schedule(&t->tasklet); | |
53 | } | |
54 | } | |
55 | } | |
56 | ||
57 | spin_unlock(&card->timer_lock); | |
58 | ||
59 | return; | |
60 | } | |
61 | ||
62 | void emu10k1_timer_install(struct emu10k1_card *card, struct emu_timer *timer, u16 delay) | |
63 | { | |
64 | struct emu_timer *t; | |
65 | struct list_head *entry; | |
66 | unsigned long flags; | |
67 | ||
68 | if (delay < 5) | |
69 | delay = 5; | |
70 | ||
71 | timer->delay = delay; | |
72 | timer->state = TIMER_STATE_INSTALLED; | |
73 | ||
74 | spin_lock_irqsave(&card->timer_lock, flags); | |
75 | ||
76 | timer->count_max = timer->delay / (card->timer_delay < 1024 ? card->timer_delay : 1024); | |
77 | timer->count = timer->count_max - 1; | |
78 | ||
79 | list_add(&timer->list, &card->timers); | |
80 | ||
81 | if (card->timer_delay > delay) { | |
82 | if (card->timer_delay == TIMER_STOPPED) | |
83 | emu10k1_irq_enable(card, INTE_INTERVALTIMERENB); | |
84 | ||
85 | card->timer_delay = delay; | |
86 | delay = (delay < 1024 ? delay : 1024); | |
87 | ||
88 | emu10k1_timer_set(card, delay); | |
89 | ||
90 | list_for_each(entry, &card->timers) { | |
91 | t = list_entry(entry, struct emu_timer, list); | |
92 | ||
93 | t->count_max = t->delay / delay; | |
94 | /* don't want to think much, just force scheduling | |
95 | on the next interrupt */ | |
96 | t->count = t->count_max - 1; | |
97 | } | |
98 | ||
99 | DPD(2, "timer rate --> %u\n", delay); | |
100 | } | |
101 | ||
102 | spin_unlock_irqrestore(&card->timer_lock, flags); | |
103 | ||
104 | return; | |
105 | } | |
106 | ||
107 | void emu10k1_timer_uninstall(struct emu10k1_card *card, struct emu_timer *timer) | |
108 | { | |
109 | struct emu_timer *t; | |
110 | struct list_head *entry; | |
111 | u16 delay = TIMER_STOPPED; | |
112 | unsigned long flags; | |
113 | ||
114 | if (timer->state == TIMER_STATE_UNINSTALLED) | |
115 | return; | |
116 | ||
117 | spin_lock_irqsave(&card->timer_lock, flags); | |
118 | ||
119 | list_del(&timer->list); | |
120 | ||
121 | list_for_each(entry, &card->timers) { | |
122 | t = list_entry(entry, struct emu_timer, list); | |
123 | ||
124 | if (t->delay < delay) | |
125 | delay = t->delay; | |
126 | } | |
127 | ||
128 | if (card->timer_delay != delay) { | |
129 | card->timer_delay = delay; | |
130 | ||
131 | if (delay == TIMER_STOPPED) | |
132 | emu10k1_irq_disable(card, INTE_INTERVALTIMERENB); | |
133 | else { | |
134 | delay = (delay < 1024 ? delay : 1024); | |
135 | ||
136 | emu10k1_timer_set(card, delay); | |
137 | ||
138 | list_for_each(entry, &card->timers) { | |
139 | t = list_entry(entry, struct emu_timer, list); | |
140 | ||
141 | t->count_max = t->delay / delay; | |
142 | t->count = t->count_max - 1; | |
143 | } | |
144 | } | |
145 | ||
146 | DPD(2, "timer rate --> %u\n", delay); | |
147 | } | |
148 | ||
149 | spin_unlock_irqrestore(&card->timer_lock, flags); | |
150 | ||
151 | timer->state = TIMER_STATE_UNINSTALLED; | |
152 | ||
153 | return; | |
154 | } | |
155 | ||
156 | void emu10k1_timer_enable(struct emu10k1_card *card, struct emu_timer *timer) | |
157 | { | |
158 | unsigned long flags; | |
159 | ||
160 | spin_lock_irqsave(&card->timer_lock, flags); | |
161 | timer->state |= TIMER_STATE_ACTIVE; | |
162 | spin_unlock_irqrestore(&card->timer_lock, flags); | |
163 | ||
164 | return; | |
165 | } | |
166 | ||
167 | void emu10k1_timer_disable(struct emu10k1_card *card, struct emu_timer *timer) | |
168 | { | |
169 | unsigned long flags; | |
170 | ||
171 | spin_lock_irqsave(&card->timer_lock, flags); | |
172 | timer->state &= ~TIMER_STATE_ACTIVE; | |
173 | spin_unlock_irqrestore(&card->timer_lock, flags); | |
174 | ||
175 | return; | |
176 | } |