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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Routines for Gravis UltraSound soundcards - Timers
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
* GUS have similar timers as AdLib (OPL2/OPL3 chips).
*/
#include <linux/time.h>
#include <sound/core.h>
#include <sound/gus.h>
/*
* Timer 1 - 80us
*/
static int snd_gf1_timer1_start(struct snd_timer * timer)
{
unsigned long flags;
unsigned char tmp;
unsigned int ticks;
struct snd_gus_card *gus;
gus = snd_timer_chip(timer);
spin_lock_irqsave(&gus->reg_lock, flags);
ticks = timer->sticks;
tmp = (gus->gf1.timer_enabled |= 4);
snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_1, 256 - ticks); /* timer 1 count */
snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* enable timer 1 IRQ */
snd_gf1_adlib_write(gus, 0x04, tmp >> 2); /* timer 2 start */
spin_unlock_irqrestore(&gus->reg_lock, flags);
return 0;
}
static int snd_gf1_timer1_stop(struct snd_timer * timer)
{
unsigned long flags;
unsigned char tmp;
struct snd_gus_card *gus;
gus = snd_timer_chip(timer);
spin_lock_irqsave(&gus->reg_lock, flags);
tmp = (gus->gf1.timer_enabled &= ~4);
snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* disable timer #1 */
spin_unlock_irqrestore(&gus->reg_lock, flags);
return 0;
}
/*
* Timer 2 - 320us
*/
static int snd_gf1_timer2_start(struct snd_timer * timer)
{
unsigned long flags;
unsigned char tmp;
unsigned int ticks;
struct snd_gus_card *gus;
gus = snd_timer_chip(timer);
spin_lock_irqsave(&gus->reg_lock, flags);
ticks = timer->sticks;
tmp = (gus->gf1.timer_enabled |= 8);
snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_2, 256 - ticks); /* timer 2 count */
snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* enable timer 2 IRQ */
snd_gf1_adlib_write(gus, 0x04, tmp >> 2); /* timer 2 start */
spin_unlock_irqrestore(&gus->reg_lock, flags);
return 0;
}
static int snd_gf1_timer2_stop(struct snd_timer * timer)
{
unsigned long flags;
unsigned char tmp;
struct snd_gus_card *gus;
gus = snd_timer_chip(timer);
spin_lock_irqsave(&gus->reg_lock, flags);
tmp = (gus->gf1.timer_enabled &= ~8);
snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* disable timer #1 */
spin_unlock_irqrestore(&gus->reg_lock, flags);
return 0;
}
/*
*/
static void snd_gf1_interrupt_timer1(struct snd_gus_card * gus)
{
struct snd_timer *timer = gus->gf1.timer1;
if (timer == NULL)
return;
snd_timer_interrupt(timer, timer->sticks);
}
static void snd_gf1_interrupt_timer2(struct snd_gus_card * gus)
{
struct snd_timer *timer = gus->gf1.timer2;
if (timer == NULL)
return;
snd_timer_interrupt(timer, timer->sticks);
}
/*
*/
static struct snd_timer_hardware snd_gf1_timer1 =
{
.flags = SNDRV_TIMER_HW_STOP,
.resolution = 80000,
.ticks = 256,
.start = snd_gf1_timer1_start,
.stop = snd_gf1_timer1_stop,
};
static struct snd_timer_hardware snd_gf1_timer2 =
{
.flags = SNDRV_TIMER_HW_STOP,
.resolution = 320000,
.ticks = 256,
.start = snd_gf1_timer2_start,
.stop = snd_gf1_timer2_stop,
};
static void snd_gf1_timer1_free(struct snd_timer *timer)
{
struct snd_gus_card *gus = timer->private_data;
gus->gf1.timer1 = NULL;
}
static void snd_gf1_timer2_free(struct snd_timer *timer)
{
struct snd_gus_card *gus = timer->private_data;
gus->gf1.timer2 = NULL;
}
void snd_gf1_timers_init(struct snd_gus_card * gus)
{
struct snd_timer *timer;
struct snd_timer_id tid;
if (gus->gf1.timer1 != NULL || gus->gf1.timer2 != NULL)
return;
gus->gf1.interrupt_handler_timer1 = snd_gf1_interrupt_timer1;
gus->gf1.interrupt_handler_timer2 = snd_gf1_interrupt_timer2;
tid.dev_class = SNDRV_TIMER_CLASS_CARD;
tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
tid.card = gus->card->number;
tid.device = gus->timer_dev;
tid.subdevice = 0;
if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
strcpy(timer->name, "GF1 timer #1");
timer->private_data = gus;
timer->private_free = snd_gf1_timer1_free;
timer->hw = snd_gf1_timer1;
}
gus->gf1.timer1 = timer;
tid.device++;
if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
strcpy(timer->name, "GF1 timer #2");
timer->private_data = gus;
timer->private_free = snd_gf1_timer2_free;
timer->hw = snd_gf1_timer2;
}
gus->gf1.timer2 = timer;
}
void snd_gf1_timers_done(struct snd_gus_card * gus)
{
snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_TIMER1 | SNDRV_GF1_HANDLER_TIMER2);
if (gus->gf1.timer1) {
snd_device_free(gus->card, gus->gf1.timer1);
gus->gf1.timer1 = NULL;
}
if (gus->gf1.timer2) {
snd_device_free(gus->card, gus->gf1.timer2);
gus->gf1.timer2 = NULL;
}
}
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