| // 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; |
| } |
| } |