sound/isa/gus/gus_timer.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Routines for Gravis UltraSound soundcards - Timers
   4  *  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 - 80us
  15  */
  16
  17 static 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
  35 static 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 - 320us
  51  */
  52
  53 static 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
  71 static 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
  89 static 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
  98 static 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
 111 static 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
 120 static 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
 129 static 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
 135 static 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
 141 void 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
 177 void 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 }