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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Routines for Gravis UltraSound soundcards - Timers
- * Copyright (c) by Jaroslav Kysela <[email protected]>
- *
- * 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 const 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 const 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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