[mirror_ubuntu-bionic-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/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) {
		pr_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(struct timer_list *unused);
static DEFINE_TIMER(sound_timer, nosound);

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(struct timer_list *unused)
{
	/* 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	16
1da177e4 LT	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	};
b9e5e119	24	#define DATA_SIZE ARRAY_SIZE(sine_data)
1da177e4	25
b4290a23 AV	26	#define custom amiga_custom
b4290a23 AV	27
1da177e4 LT	28	/*
	29	* The minimum period for audio may be modified by the frame buffer
	30	* device since it depends on htotal (for OCS/ECS/AGA)
	31	*/
	32
	33	volatile unsigned short amiga_audio_min_period = 124; /* Default for pre-OCS */
8b169fa2	34	EXPORT_SYMBOL(amiga_audio_min_period);
1da177e4 LT	35
	36	#define MAX_PERIOD (65535)
	37
	38
	39	/*
	40	* Current period (set by dmasound.c)
	41	*/
	42
	43	unsigned short amiga_audio_period = MAX_PERIOD;
8b169fa2	44	EXPORT_SYMBOL(amiga_audio_period);
1da177e4 LT	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) {
f296401b	54	pr_crit("amiga init_sound: failed to allocate chipmem\n");
1da177e4 LT	55	return;
	56	}
	57	memcpy (snd_data, sine_data, sizeof(sine_data));
	58
	59	/* setup divisor */
	60	clock_constant = (amiga_colorclock+DATA_SIZE/2)/DATA_SIZE;
	61
	62	/* without amifb, turn video off and enable high quality sound */
	63	#ifndef CONFIG_FB_AMIGA
	64	amifb_video_off();
	65	#endif
	66	}
	67
24ed960a	68	static void nosound(struct timer_list *unused);
1d27e3e2	69	static DEFINE_TIMER(sound_timer, nosound);
1da177e4 LT	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	/* setup pointer to data, period, length and volume */
	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; /* 50% of maxvol */
	94
	95	if (ticks) {
	96	sound_timer.expires = jiffies + ticks;
	97	add_timer( &sound_timer );
	98	}
	99
	100	/* turn on DMA for audio channel 2 */
	101	custom.dmacon = DMAF_SETCLR \| DMAF_AUD2;
	102
	103	} else
	104	nosound( 0 );
	105
	106	local_irq_restore(flags);
	107	}
	108
	109
24ed960a	110	static void nosound(struct timer_list *unused)
1da177e4 LT	111	{
	112	/* turn off DMA for audio channel 2 */
	113	custom.dmacon = DMAF_AUD2;
	114	/* restore period to previous value after beeping */
	115	custom.aud[2].audper = amiga_audio_period;
	116	}