^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * linux/arch/m68k/amiga/amisound.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * amiga sound driver for Linux/m68k
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * License. See the file COPYING in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/amigahw.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static unsigned short *snd_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static const signed char sine_data[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 0, 39, 75, 103, 121, 127, 121, 103, 75, 39,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 0, -39, -75, -103, -121, -127, -121, -103, -75, -39
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define DATA_SIZE ARRAY_SIZE(sine_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define custom amiga_custom
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * The minimum period for audio may be modified by the frame buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * device since it depends on htotal (for OCS/ECS/AGA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) volatile unsigned short amiga_audio_min_period = 124; /* Default for pre-OCS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) EXPORT_SYMBOL(amiga_audio_min_period);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define MAX_PERIOD (65535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Current period (set by dmasound.c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned short amiga_audio_period = MAX_PERIOD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) EXPORT_SYMBOL(amiga_audio_period);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static unsigned long clock_constant;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) void __init amiga_init_sound(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static struct resource beep_res = { .name = "Beep" };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) snd_data = amiga_chip_alloc_res(sizeof(sine_data), &beep_res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (!snd_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) pr_crit("amiga init_sound: failed to allocate chipmem\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) memcpy (snd_data, sine_data, sizeof(sine_data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* setup divisor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) clock_constant = (amiga_colorclock+DATA_SIZE/2)/DATA_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* without amifb, turn video off and enable high quality sound */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #ifndef CONFIG_FB_AMIGA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) amifb_video_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static void nosound(struct timer_list *unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static DEFINE_TIMER(sound_timer, nosound);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) void amiga_mksound( unsigned int hz, unsigned int ticks )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (!snd_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) del_timer( &sound_timer );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (hz > 20 && hz < 32767) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned long period = (clock_constant / hz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (period < amiga_audio_min_period)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) period = amiga_audio_min_period;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (period > MAX_PERIOD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) period = MAX_PERIOD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* setup pointer to data, period, length and volume */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) custom.aud[2].audlc = snd_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) custom.aud[2].audlen = sizeof(sine_data)/2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) custom.aud[2].audper = (unsigned short)period;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) custom.aud[2].audvol = 32; /* 50% of maxvol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (ticks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) sound_timer.expires = jiffies + ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) add_timer( &sound_timer );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* turn on DMA for audio channel 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) custom.dmacon = DMAF_SETCLR | DMAF_AUD2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) nosound( 0 );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static void nosound(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* turn off DMA for audio channel 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) custom.dmacon = DMAF_AUD2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* restore period to previous value after beeping */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) custom.aud[2].audper = amiga_audio_period;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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