summaryrefslogtreecommitdiff
path: root/sound/isa/gus/gus_timer.c
blob: c53727147a1ac6c9fae64513f7d6ae63ecb91919 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
/*
 *  Routines for Gravis UltraSound soundcards - Timers
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *  GUS have similar timers as AdLib (OPL2/OPL3 chips).
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/time.h>
#include <sound/core.h>
#include <sound/gus.h>

/*
 *  Timer 1 - 80us
 */

static int snd_gf1_timer1_start(struct snd_timer * timer)
{
	unsigned long flags;
	unsigned char tmp;
	unsigned int ticks;
	struct snd_gus_card *gus;

	gus = snd_timer_chip(timer);
	spin_lock_irqsave(&gus->reg_lock, flags);
	ticks = timer->sticks;
	tmp = (gus->gf1.timer_enabled |= 4);
	snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_1, 256 - ticks);	/* timer 1 count */
	snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);	/* enable timer 1 IRQ */
	snd_gf1_adlib_write(gus, 0x04, tmp >> 2);	/* timer 2 start */
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return 0;
}

static int snd_gf1_timer1_stop(struct snd_timer * timer)
{
	unsigned long flags;
	unsigned char tmp;
	struct snd_gus_card *gus;

	gus = snd_timer_chip(timer);
	spin_lock_irqsave(&gus->reg_lock, flags);
	tmp = (gus->gf1.timer_enabled &= ~4);
	snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);	/* disable timer #1 */
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return 0;
}

/*
 *  Timer 2 - 320us
 */

static int snd_gf1_timer2_start(struct snd_timer * timer)
{
	unsigned long flags;
	unsigned char tmp;
	unsigned int ticks;
	struct snd_gus_card *gus;

	gus = snd_timer_chip(timer);
	spin_lock_irqsave(&gus->reg_lock, flags);
	ticks = timer->sticks;
	tmp = (gus->gf1.timer_enabled |= 8);
	snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_2, 256 - ticks);	/* timer 2 count */
	snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);	/* enable timer 2 IRQ */
	snd_gf1_adlib_write(gus, 0x04, tmp >> 2);	/* timer 2 start */
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return 0;
}

static int snd_gf1_timer2_stop(struct snd_timer * timer)
{
	unsigned long flags;
	unsigned char tmp;
	struct snd_gus_card *gus;

	gus = snd_timer_chip(timer);
	spin_lock_irqsave(&gus->reg_lock, flags);
	tmp = (gus->gf1.timer_enabled &= ~8);
	snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);	/* disable timer #1 */
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return 0;
}

/*

 */

static void snd_gf1_interrupt_timer1(struct snd_gus_card * gus)
{
	struct snd_timer *timer = gus->gf1.timer1;

	if (timer == NULL)
		return;
	snd_timer_interrupt(timer, timer->sticks);
}

static void snd_gf1_interrupt_timer2(struct snd_gus_card * gus)
{
	struct snd_timer *timer = gus->gf1.timer2;

	if (timer == NULL)
		return;
	snd_timer_interrupt(timer, timer->sticks);
}

/*

 */

static struct snd_timer_hardware snd_gf1_timer1 =
{
	.flags =	SNDRV_TIMER_HW_STOP,
	.resolution =	80000,
	.ticks =	256,
	.start =	snd_gf1_timer1_start,
	.stop =		snd_gf1_timer1_stop,
};

static struct snd_timer_hardware snd_gf1_timer2 =
{
	.flags =	SNDRV_TIMER_HW_STOP,
	.resolution =	320000,
	.ticks =	256,
	.start =	snd_gf1_timer2_start,
	.stop =		snd_gf1_timer2_stop,
};

static void snd_gf1_timer1_free(struct snd_timer *timer)
{
	struct snd_gus_card *gus = timer->private_data;
	gus->gf1.timer1 = NULL;
}

static void snd_gf1_timer2_free(struct snd_timer *timer)
{
	struct snd_gus_card *gus = timer->private_data;
	gus->gf1.timer2 = NULL;
}

void snd_gf1_timers_init(struct snd_gus_card * gus)
{
	struct snd_timer *timer;
	struct snd_timer_id tid;

	if (gus->gf1.timer1 != NULL || gus->gf1.timer2 != NULL)
		return;

	gus->gf1.interrupt_handler_timer1 = snd_gf1_interrupt_timer1;
	gus->gf1.interrupt_handler_timer2 = snd_gf1_interrupt_timer2;

	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
	tid.card = gus->card->number;
	tid.device = gus->timer_dev;
	tid.subdevice = 0;

	if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
		strcpy(timer->name, "GF1 timer #1");
		timer->private_data = gus;
		timer->private_free = snd_gf1_timer1_free;
		timer->hw = snd_gf1_timer1;
	}
	gus->gf1.timer1 = timer;

	tid.device++;

	if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
		strcpy(timer->name, "GF1 timer #2");
		timer->private_data = gus;
		timer->private_free = snd_gf1_timer2_free;
		timer->hw = snd_gf1_timer2;
	}
	gus->gf1.timer2 = timer;
}

void snd_gf1_timers_done(struct snd_gus_card * gus)
{
	snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_TIMER1 | SNDRV_GF1_HANDLER_TIMER2);
	if (gus->gf1.timer1) {
		snd_device_free(gus->card, gus->gf1.timer1);
		gus->gf1.timer1 = NULL;
	}
	if (gus->gf1.timer2) {
		snd_device_free(gus->card, gus->gf1.timer2);
		gus->gf1.timer2 = NULL;
	}
}