diff options
Diffstat (limited to 'sound/isa/gus/gus_timer.c')
| -rw-r--r-- | sound/isa/gus/gus_timer.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/sound/isa/gus/gus_timer.c b/sound/isa/gus/gus_timer.c new file mode 100644 index 00000000..c5372714 --- /dev/null +++ b/sound/isa/gus/gus_timer.c @@ -0,0 +1,203 @@ +/* + * Routines for Gravis UltraSound soundcards - Timers + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * + * GUS have similar timers as AdLib (OPL2/OPL3 chips). + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#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; + } +} |