1 /* 1 /*
2 * linux/arch/m68k/amiga/amisound.c 2 * linux/arch/m68k/amiga/amisound.c
3 * 3 *
4 * amiga sound driver for Linux/m68k 4 * amiga sound driver for Linux/m68k
5 * 5 *
6 * This file is subject to the terms and condi 6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main 7 * License. See the file COPYING in the main directory of this archive
8 * for more details. 8 * for more details.
9 */ 9 */
10 10
11 #include <linux/jiffies.h> 11 #include <linux/jiffies.h>
12 #include <linux/timer.h> 12 #include <linux/timer.h>
13 #include <linux/init.h> 13 #include <linux/init.h>
14 #include <linux/string.h> 14 #include <linux/string.h>
15 #include <linux/module.h> 15 #include <linux/module.h>
16 16
17 #include <asm/amigahw.h> 17 #include <asm/amigahw.h>
18 18
19 #include "amiga.h" 19 #include "amiga.h"
20 20
21 static unsigned short *snd_data; 21 static unsigned short *snd_data;
22 static const signed char sine_data[] = { 22 static const signed char sine_data[] = {
23 0, 39, 75, 103, 121, 127, 121, 23 0, 39, 75, 103, 121, 127, 121, 103, 75, 39,
24 0, -39, -75, -103, -121, -127, -121, - 24 0, -39, -75, -103, -121, -127, -121, -103, -75, -39
25 }; 25 };
26 #define DATA_SIZE ARRAY_SIZE(sine_data) 26 #define DATA_SIZE ARRAY_SIZE(sine_data)
27 27
28 #define custom amiga_custom 28 #define custom amiga_custom
29 29
30 /* 30 /*
31 * The minimum period for audio may be mod 31 * The minimum period for audio may be modified by the frame buffer
32 * device since it depends on htotal (for 32 * device since it depends on htotal (for OCS/ECS/AGA)
33 */ 33 */
34 34
35 volatile unsigned short amiga_audio_min_period 35 volatile unsigned short amiga_audio_min_period = 124; /* Default for pre-OCS */
36 EXPORT_SYMBOL(amiga_audio_min_period); 36 EXPORT_SYMBOL(amiga_audio_min_period);
37 37
38 #define MAX_PERIOD (65535) 38 #define MAX_PERIOD (65535)
39 39
40 40
41 /* 41 /*
42 * Current period (set by dmasound.c) 42 * Current period (set by dmasound.c)
43 */ 43 */
44 44
45 unsigned short amiga_audio_period = MAX_PERIOD 45 unsigned short amiga_audio_period = MAX_PERIOD;
46 EXPORT_SYMBOL(amiga_audio_period); 46 EXPORT_SYMBOL(amiga_audio_period);
47 47
48 static unsigned long clock_constant; 48 static unsigned long clock_constant;
49 49
50 void __init amiga_init_sound(void) 50 void __init amiga_init_sound(void)
51 { 51 {
52 static struct resource beep_res = { .n 52 static struct resource beep_res = { .name = "Beep" };
53 53
54 snd_data = amiga_chip_alloc_res(sizeof 54 snd_data = amiga_chip_alloc_res(sizeof(sine_data), &beep_res);
55 if (!snd_data) { 55 if (!snd_data) {
56 pr_crit("amiga init_sound: fai 56 pr_crit("amiga init_sound: failed to allocate chipmem\n");
57 return; 57 return;
58 } 58 }
59 memcpy (snd_data, sine_data, sizeof(si 59 memcpy (snd_data, sine_data, sizeof(sine_data));
60 60
61 /* setup divisor */ 61 /* setup divisor */
62 clock_constant = (amiga_colorclock+DAT 62 clock_constant = (amiga_colorclock+DATA_SIZE/2)/DATA_SIZE;
63 63
64 /* without amifb, turn video off and e 64 /* without amifb, turn video off and enable high quality sound */
65 #ifndef CONFIG_FB_AMIGA 65 #ifndef CONFIG_FB_AMIGA
66 amifb_video_off(); 66 amifb_video_off();
67 #endif 67 #endif
68 } 68 }
69 69
70 static void nosound(struct timer_list *unused) 70 static void nosound(struct timer_list *unused);
71 static DEFINE_TIMER(sound_timer, nosound); 71 static DEFINE_TIMER(sound_timer, nosound);
72 72
73 void amiga_mksound( unsigned int hz, unsigned 73 void amiga_mksound( unsigned int hz, unsigned int ticks )
74 { 74 {
75 unsigned long flags; 75 unsigned long flags;
76 76
77 if (!snd_data) 77 if (!snd_data)
78 return; 78 return;
79 79
80 local_irq_save(flags); 80 local_irq_save(flags);
81 del_timer( &sound_timer ); 81 del_timer( &sound_timer );
82 82
83 if (hz > 20 && hz < 32767) { 83 if (hz > 20 && hz < 32767) {
84 unsigned long period = (clock_ 84 unsigned long period = (clock_constant / hz);
85 85
86 if (period < amiga_audio_min_p 86 if (period < amiga_audio_min_period)
87 period = amiga_audio_m 87 period = amiga_audio_min_period;
88 if (period > MAX_PERIOD) 88 if (period > MAX_PERIOD)
89 period = MAX_PERIOD; 89 period = MAX_PERIOD;
90 90
91 /* setup pointer to data, peri 91 /* setup pointer to data, period, length and volume */
92 custom.aud[2].audlc = snd_data 92 custom.aud[2].audlc = snd_data;
93 custom.aud[2].audlen = sizeof( 93 custom.aud[2].audlen = sizeof(sine_data)/2;
94 custom.aud[2].audper = (unsign 94 custom.aud[2].audper = (unsigned short)period;
95 custom.aud[2].audvol = 32; /* 95 custom.aud[2].audvol = 32; /* 50% of maxvol */
96 96
97 if (ticks) { 97 if (ticks) {
98 sound_timer.expires = 98 sound_timer.expires = jiffies + ticks;
99 add_timer( &sound_time 99 add_timer( &sound_timer );
100 } 100 }
101 101
102 /* turn on DMA for audio chann 102 /* turn on DMA for audio channel 2 */
103 custom.dmacon = DMAF_SETCLR | 103 custom.dmacon = DMAF_SETCLR | DMAF_AUD2;
104 104
105 } else 105 } else
106 nosound( 0 ); 106 nosound( 0 );
107 107
108 local_irq_restore(flags); 108 local_irq_restore(flags);
109 } 109 }
110 110
111 111
112 static void nosound(struct timer_list *unused) 112 static void nosound(struct timer_list *unused)
113 { 113 {
114 /* turn off DMA for audio channel 2 */ 114 /* turn off DMA for audio channel 2 */
115 custom.dmacon = DMAF_AUD2; 115 custom.dmacon = DMAF_AUD2;
116 /* restore period to previous value af 116 /* restore period to previous value after beeping */
117 custom.aud[2].audper = amiga_audio_per 117 custom.aud[2].audper = amiga_audio_period;
118 } 118 }
119 119
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