This source file includes following definitions.
- amiga_init_sound
- amiga_mksound
- nosound
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11 #include <linux/jiffies.h>
12 #include <linux/timer.h>
13 #include <linux/init.h>
14 #include <linux/string.h>
15 #include <linux/module.h>
16
17 #include <asm/amigahw.h>
18
19 static unsigned short *snd_data;
20 static const signed char sine_data[] = {
21 0, 39, 75, 103, 121, 127, 121, 103, 75, 39,
22 0, -39, -75, -103, -121, -127, -121, -103, -75, -39
23 };
24 #define DATA_SIZE ARRAY_SIZE(sine_data)
25
26 #define custom amiga_custom
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33 volatile unsigned short amiga_audio_min_period = 124;
34 EXPORT_SYMBOL(amiga_audio_min_period);
35
36 #define MAX_PERIOD (65535)
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43 unsigned short amiga_audio_period = MAX_PERIOD;
44 EXPORT_SYMBOL(amiga_audio_period);
45
46 static unsigned long clock_constant;
47
48 void __init amiga_init_sound(void)
49 {
50 static struct resource beep_res = { .name = "Beep" };
51
52 snd_data = amiga_chip_alloc_res(sizeof(sine_data), &beep_res);
53 if (!snd_data) {
54 pr_crit("amiga init_sound: failed to allocate chipmem\n");
55 return;
56 }
57 memcpy (snd_data, sine_data, sizeof(sine_data));
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60 clock_constant = (amiga_colorclock+DATA_SIZE/2)/DATA_SIZE;
61
62
63 #ifndef CONFIG_FB_AMIGA
64 amifb_video_off();
65 #endif
66 }
67
68 static void nosound(struct timer_list *unused);
69 static DEFINE_TIMER(sound_timer, nosound);
70
71 void amiga_mksound( unsigned int hz, unsigned int ticks )
72 {
73 unsigned long flags;
74
75 if (!snd_data)
76 return;
77
78 local_irq_save(flags);
79 del_timer( &sound_timer );
80
81 if (hz > 20 && hz < 32767) {
82 unsigned long period = (clock_constant / hz);
83
84 if (period < amiga_audio_min_period)
85 period = amiga_audio_min_period;
86 if (period > MAX_PERIOD)
87 period = MAX_PERIOD;
88
89
90 custom.aud[2].audlc = snd_data;
91 custom.aud[2].audlen = sizeof(sine_data)/2;
92 custom.aud[2].audper = (unsigned short)period;
93 custom.aud[2].audvol = 32;
94
95 if (ticks) {
96 sound_timer.expires = jiffies + ticks;
97 add_timer( &sound_timer );
98 }
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101 custom.dmacon = DMAF_SETCLR | DMAF_AUD2;
102
103 } else
104 nosound( 0 );
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106 local_irq_restore(flags);
107 }
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110 static void nosound(struct timer_list *unused)
111 {
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113 custom.dmacon = DMAF_AUD2;
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115 custom.aud[2].audper = amiga_audio_period;
116 }