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