[mirror_ubuntu-jammy-kernel.git] / arch / m68k / amiga / amisound.c

/*
 * linux/arch/m68k/amiga/amisound.c
 *
 * amiga sound driver for Linux/m68k
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/module.h>

#include <asm/system.h>
#include <asm/amigahw.h>

static unsigned short *snd_data;
static const signed char sine_data[] = {
	0,  39,  75,  103,  121,  127,  121,  103,  75,  39,
	0, -39, -75, -103, -121, -127, -121, -103, -75, -39
};
#define DATA_SIZE	ARRAY_SIZE(sine_data)

#define custom amiga_custom

    /*
     * The minimum period for audio may be modified by the frame buffer
     * device since it depends on htotal (for OCS/ECS/AGA)
     */

volatile unsigned short amiga_audio_min_period = 124; /* Default for pre-OCS */
EXPORT_SYMBOL(amiga_audio_min_period);

#define MAX_PERIOD	(65535)


    /*
     *	Current period (set by dmasound.c)
     */

unsigned short amiga_audio_period = MAX_PERIOD;
EXPORT_SYMBOL(amiga_audio_period);

static unsigned long clock_constant;

void __init amiga_init_sound(void)
{
	static struct resource beep_res = { .name = "Beep" };

	snd_data = amiga_chip_alloc_res(sizeof(sine_data), &beep_res);
	if (!snd_data) {
		printk (KERN_CRIT "amiga init_sound: failed to allocate chipmem\n");
		return;
	}
	memcpy (snd_data, sine_data, sizeof(sine_data));

	/* setup divisor */
	clock_constant = (amiga_colorclock+DATA_SIZE/2)/DATA_SIZE;

	/* without amifb, turn video off and enable high quality sound */
#ifndef CONFIG_FB_AMIGA
	amifb_video_off();
#endif
}

static void nosound( unsigned long ignored );
static DEFINE_TIMER(sound_timer, nosound, 0, 0);

void amiga_mksound( unsigned int hz, unsigned int ticks )
{
	unsigned long flags;

	if (!snd_data)
		return;

	local_irq_save(flags);
	del_timer( &sound_timer );

	if (hz > 20 && hz < 32767) {
		unsigned long period = (clock_constant / hz);

		if (period < amiga_audio_min_period)
			period = amiga_audio_min_period;
		if (period > MAX_PERIOD)
			period = MAX_PERIOD;

		/* setup pointer to data, period, length and volume */
		custom.aud[2].audlc = snd_data;
		custom.aud[2].audlen = sizeof(sine_data)/2;
		custom.aud[2].audper = (unsigned short)period;
		custom.aud[2].audvol = 32; /* 50% of maxvol */

		if (ticks) {
			sound_timer.expires = jiffies + ticks;
			add_timer( &sound_timer );
		}

		/* turn on DMA for audio channel 2 */
		custom.dmacon = DMAF_SETCLR | DMAF_AUD2;

	} else
		nosound( 0 );

	local_irq_restore(flags);
}


static void nosound( unsigned long ignored )
{
	/* turn off DMA for audio channel 2 */
	custom.dmacon = DMAF_AUD2;
	/* restore period to previous value after beeping */
	custom.aud[2].audper = amiga_audio_period;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m68k/amiga/amisound.c
	3	*
	4	* amiga sound driver for Linux/m68k
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file COPYING in the main directory of this archive
	8	* for more details.
	9	*/
	10
1da177e4 LT	11	#include <linux/jiffies.h>
	12	#include <linux/timer.h>
	13	#include <linux/init.h>
	14	#include <linux/string.h>
8b169fa2	15	#include <linux/module.h>
1da177e4 LT	16
	17	#include <asm/system.h>
	18	#include <asm/amigahw.h>
	19
	20	static unsigned short *snd_data;
	21	static const signed char sine_data[] = {
	22	0, 39, 75, 103, 121, 127, 121, 103, 75, 39,
	23	0, -39, -75, -103, -121, -127, -121, -103, -75, -39
	24	};
b9e5e119	25	#define DATA_SIZE ARRAY_SIZE(sine_data)
1da177e4	26
b4290a23 AV	27	#define custom amiga_custom
b4290a23 AV	28
1da177e4 LT	29	/*
	30	* The minimum period for audio may be modified by the frame buffer
	31	* device since it depends on htotal (for OCS/ECS/AGA)
	32	*/
	33
	34	volatile unsigned short amiga_audio_min_period = 124; /* Default for pre-OCS */
8b169fa2	35	EXPORT_SYMBOL(amiga_audio_min_period);
1da177e4 LT	36
	37	#define MAX_PERIOD (65535)
	38
	39
	40	/*
	41	* Current period (set by dmasound.c)
	42	*/
	43
	44	unsigned short amiga_audio_period = MAX_PERIOD;
8b169fa2	45	EXPORT_SYMBOL(amiga_audio_period);
1da177e4 LT	46
	47	static unsigned long clock_constant;
	48
	49	void __init amiga_init_sound(void)
	50	{
	51	static struct resource beep_res = { .name = "Beep" };
	52
	53	snd_data = amiga_chip_alloc_res(sizeof(sine_data), &beep_res);
	54	if (!snd_data) {
	55	printk (KERN_CRIT "amiga init_sound: failed to allocate chipmem\n");
	56	return;
	57	}
	58	memcpy (snd_data, sine_data, sizeof(sine_data));
	59
	60	/* setup divisor */
	61	clock_constant = (amiga_colorclock+DATA_SIZE/2)/DATA_SIZE;
	62
	63	/* without amifb, turn video off and enable high quality sound */
	64	#ifndef CONFIG_FB_AMIGA
	65	amifb_video_off();
	66	#endif
	67	}
	68
	69	static void nosound( unsigned long ignored );
8d06afab	70	static DEFINE_TIMER(sound_timer, nosound, 0, 0);
1da177e4 LT	71
	72	void amiga_mksound( unsigned int hz, unsigned int ticks )
	73	{
	74	unsigned long flags;
	75
	76	if (!snd_data)
	77	return;
	78
	79	local_irq_save(flags);
	80	del_timer( &sound_timer );
	81
	82	if (hz > 20 && hz < 32767) {
	83	unsigned long period = (clock_constant / hz);
	84
	85	if (period < amiga_audio_min_period)
	86	period = amiga_audio_min_period;
	87	if (period > MAX_PERIOD)
	88	period = MAX_PERIOD;
	89
	90	/* setup pointer to data, period, length and volume */
	91	custom.aud[2].audlc = snd_data;
	92	custom.aud[2].audlen = sizeof(sine_data)/2;
	93	custom.aud[2].audper = (unsigned short)period;
	94	custom.aud[2].audvol = 32; /* 50% of maxvol */
	95
	96	if (ticks) {
	97	sound_timer.expires = jiffies + ticks;
	98	add_timer( &sound_timer );
	99	}
	100
	101	/* turn on DMA for audio channel 2 */
	102	custom.dmacon = DMAF_SETCLR \| DMAF_AUD2;
	103
	104	} else
	105	nosound( 0 );
	106
	107	local_irq_restore(flags);
	108	}
	109
	110
	111	static void nosound( unsigned long ignored )
	112	{
	113	/* turn off DMA for audio channel 2 */
	114	custom.dmacon = DMAF_AUD2;
	115	/* restore period to previous value after beeping */
	116	custom.aud[2].audper = amiga_audio_period;
	117	}