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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Routines for Gravis UltraSound soundcards - Timers4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>5 *6 * GUS have similar timers as AdLib (OPL2/OPL3 chips).7 */8 9#include <linux/time.h>10#include <sound/core.h>11#include <sound/gus.h>12 13/*14 * Timer 1 - 80us15 */16 17static int snd_gf1_timer1_start(struct snd_timer * timer)18{19 unsigned long flags;20 unsigned char tmp;21 unsigned int ticks;22 struct snd_gus_card *gus;23 24 gus = snd_timer_chip(timer);25 spin_lock_irqsave(&gus->reg_lock, flags);26 ticks = timer->sticks;27 tmp = (gus->gf1.timer_enabled |= 4);28 snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_1, 256 - ticks); /* timer 1 count */29 snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* enable timer 1 IRQ */30 snd_gf1_adlib_write(gus, 0x04, tmp >> 2); /* timer 2 start */31 spin_unlock_irqrestore(&gus->reg_lock, flags);32 return 0;33}34 35static int snd_gf1_timer1_stop(struct snd_timer * timer)36{37 unsigned long flags;38 unsigned char tmp;39 struct snd_gus_card *gus;40 41 gus = snd_timer_chip(timer);42 spin_lock_irqsave(&gus->reg_lock, flags);43 tmp = (gus->gf1.timer_enabled &= ~4);44 snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* disable timer #1 */45 spin_unlock_irqrestore(&gus->reg_lock, flags);46 return 0;47}48 49/*50 * Timer 2 - 320us51 */52 53static int snd_gf1_timer2_start(struct snd_timer * timer)54{55 unsigned long flags;56 unsigned char tmp;57 unsigned int ticks;58 struct snd_gus_card *gus;59 60 gus = snd_timer_chip(timer);61 spin_lock_irqsave(&gus->reg_lock, flags);62 ticks = timer->sticks;63 tmp = (gus->gf1.timer_enabled |= 8);64 snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_2, 256 - ticks); /* timer 2 count */65 snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* enable timer 2 IRQ */66 snd_gf1_adlib_write(gus, 0x04, tmp >> 2); /* timer 2 start */67 spin_unlock_irqrestore(&gus->reg_lock, flags);68 return 0;69}70 71static int snd_gf1_timer2_stop(struct snd_timer * timer)72{73 unsigned long flags;74 unsigned char tmp;75 struct snd_gus_card *gus;76 77 gus = snd_timer_chip(timer);78 spin_lock_irqsave(&gus->reg_lock, flags);79 tmp = (gus->gf1.timer_enabled &= ~8);80 snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp); /* disable timer #1 */81 spin_unlock_irqrestore(&gus->reg_lock, flags);82 return 0;83}84 85/*86 87 */88 89static void snd_gf1_interrupt_timer1(struct snd_gus_card * gus)90{91 struct snd_timer *timer = gus->gf1.timer1;92 93 if (timer == NULL)94 return;95 snd_timer_interrupt(timer, timer->sticks);96}97 98static void snd_gf1_interrupt_timer2(struct snd_gus_card * gus)99{100 struct snd_timer *timer = gus->gf1.timer2;101 102 if (timer == NULL)103 return;104 snd_timer_interrupt(timer, timer->sticks);105}106 107/*108 109 */110 111static const struct snd_timer_hardware snd_gf1_timer1 =112{113 .flags = SNDRV_TIMER_HW_STOP,114 .resolution = 80000,115 .ticks = 256,116 .start = snd_gf1_timer1_start,117 .stop = snd_gf1_timer1_stop,118};119 120static const struct snd_timer_hardware snd_gf1_timer2 =121{122 .flags = SNDRV_TIMER_HW_STOP,123 .resolution = 320000,124 .ticks = 256,125 .start = snd_gf1_timer2_start,126 .stop = snd_gf1_timer2_stop,127};128 129static void snd_gf1_timer1_free(struct snd_timer *timer)130{131 struct snd_gus_card *gus = timer->private_data;132 gus->gf1.timer1 = NULL;133}134 135static void snd_gf1_timer2_free(struct snd_timer *timer)136{137 struct snd_gus_card *gus = timer->private_data;138 gus->gf1.timer2 = NULL;139}140 141void snd_gf1_timers_init(struct snd_gus_card * gus)142{143 struct snd_timer *timer;144 struct snd_timer_id tid;145 146 if (gus->gf1.timer1 != NULL || gus->gf1.timer2 != NULL)147 return;148 149 gus->gf1.interrupt_handler_timer1 = snd_gf1_interrupt_timer1;150 gus->gf1.interrupt_handler_timer2 = snd_gf1_interrupt_timer2;151 152 tid.dev_class = SNDRV_TIMER_CLASS_CARD;153 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;154 tid.card = gus->card->number;155 tid.device = gus->timer_dev;156 tid.subdevice = 0;157 158 if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {159 strcpy(timer->name, "GF1 timer #1");160 timer->private_data = gus;161 timer->private_free = snd_gf1_timer1_free;162 timer->hw = snd_gf1_timer1;163 }164 gus->gf1.timer1 = timer;165 166 tid.device++;167 168 if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {169 strcpy(timer->name, "GF1 timer #2");170 timer->private_data = gus;171 timer->private_free = snd_gf1_timer2_free;172 timer->hw = snd_gf1_timer2;173 }174 gus->gf1.timer2 = timer;175}176 177void snd_gf1_timers_done(struct snd_gus_card * gus)178{179 snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_TIMER1 | SNDRV_GF1_HANDLER_TIMER2);180 if (gus->gf1.timer1) {181 snd_device_free(gus->card, gus->gf1.timer1);182 gus->gf1.timer1 = NULL;183 }184 if (gus->gf1.timer2) {185 snd_device_free(gus->card, gus->gf1.timer2);186 gus->gf1.timer2 = NULL;187 }188}189