sound/isa/gus/gus_timer.c

   1 /*
   2  *  Routines for Gravis UltraSound soundcards - Timers
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *  GUS have similar timers as AdLib (OPL2/OPL3 chips).
   6  *
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  *
  22  */
  23
  24 #include <linux/time.h>
  25 #include <sound/core.h>
  26 #include <sound/gus.h>
  27
  28 /*
  29  *  Timer 1 - 80us
  30  */
  31
  32 static int snd_gf1_timer1_start(struct snd_timer * timer)
  33 {
  34         unsigned long flags;
  35         unsigned char tmp;
  36         unsigned int ticks;
  37         struct snd_gus_card *gus;
  38
  39         gus = snd_timer_chip(timer);
  40         spin_lock_irqsave(&gus->reg_lock, flags);
  41         ticks = timer->sticks;
  42         tmp = (gus->gf1.timer_enabled |= 4);
  43         snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_1, 256 - ticks);   /* timer 1 count */
  44         snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* enable timer 1 IRQ */
  45         snd_gf1_adlib_write(gus, 0x04, tmp >> 2);       /* timer 2 start */
  46         spin_unlock_irqrestore(&gus->reg_lock, flags);
  47         return 0;
  48 }
  49
  50 static int snd_gf1_timer1_stop(struct snd_timer * timer)
  51 {
  52         unsigned long flags;
  53         unsigned char tmp;
  54         struct snd_gus_card *gus;
  55
  56         gus = snd_timer_chip(timer);
  57         spin_lock_irqsave(&gus->reg_lock, flags);
  58         tmp = (gus->gf1.timer_enabled &= ~4);
  59         snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* disable timer #1 */
  60         spin_unlock_irqrestore(&gus->reg_lock, flags);
  61         return 0;
  62 }
  63
  64 /*
  65  *  Timer 2 - 320us
  66  */
  67
  68 static int snd_gf1_timer2_start(struct snd_timer * timer)
  69 {
  70         unsigned long flags;
  71         unsigned char tmp;
  72         unsigned int ticks;
  73         struct snd_gus_card *gus;
  74
  75         gus = snd_timer_chip(timer);
  76         spin_lock_irqsave(&gus->reg_lock, flags);
  77         ticks = timer->sticks;
  78         tmp = (gus->gf1.timer_enabled |= 8);
  79         snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_2, 256 - ticks);   /* timer 2 count */
  80         snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* enable timer 2 IRQ */
  81         snd_gf1_adlib_write(gus, 0x04, tmp >> 2);       /* timer 2 start */
  82         spin_unlock_irqrestore(&gus->reg_lock, flags);
  83         return 0;
  84 }
  85
  86 static int snd_gf1_timer2_stop(struct snd_timer * timer)
  87 {
  88         unsigned long flags;
  89         unsigned char tmp;
  90         struct snd_gus_card *gus;
  91
  92         gus = snd_timer_chip(timer);
  93         spin_lock_irqsave(&gus->reg_lock, flags);
  94         tmp = (gus->gf1.timer_enabled &= ~8);
  95         snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* disable timer #1 */
  96         spin_unlock_irqrestore(&gus->reg_lock, flags);
  97         return 0;
  98 }
  99
 100 /*
 101
 102  */
 103
 104 static void snd_gf1_interrupt_timer1(struct snd_gus_card * gus)
 105 {
 106         struct snd_timer *timer = gus->gf1.timer1;
 107
 108         if (timer == NULL)
 109                 return;
 110         snd_timer_interrupt(timer, timer->sticks);
 111 }
 112
 113 static void snd_gf1_interrupt_timer2(struct snd_gus_card * gus)
 114 {
 115         struct snd_timer *timer = gus->gf1.timer2;
 116
 117         if (timer == NULL)
 118                 return;
 119         snd_timer_interrupt(timer, timer->sticks);
 120 }
 121
 122 /*
 123
 124  */
 125
 126 static struct snd_timer_hardware snd_gf1_timer1 =
 127 {
 128         .flags =        SNDRV_TIMER_HW_STOP,
 129         .resolution =   80000,
 130         .ticks =        256,
 131         .start =        snd_gf1_timer1_start,
 132         .stop =         snd_gf1_timer1_stop,
 133 };
 134
 135 static struct snd_timer_hardware snd_gf1_timer2 =
 136 {
 137         .flags =        SNDRV_TIMER_HW_STOP,
 138         .resolution =   320000,
 139         .ticks =        256,
 140         .start =        snd_gf1_timer2_start,
 141         .stop =         snd_gf1_timer2_stop,
 142 };
 143
 144 static void snd_gf1_timer1_free(struct snd_timer *timer)
 145 {
 146         struct snd_gus_card *gus = timer->private_data;
 147         gus->gf1.timer1 = NULL;
 148 }
 149
 150 static void snd_gf1_timer2_free(struct snd_timer *timer)
 151 {
 152         struct snd_gus_card *gus = timer->private_data;
 153         gus->gf1.timer2 = NULL;
 154 }
 155
 156 void snd_gf1_timers_init(struct snd_gus_card * gus)
 157 {
 158         struct snd_timer *timer;
 159         struct snd_timer_id tid;
 160
 161         if (gus->gf1.timer1 != NULL || gus->gf1.timer2 != NULL)
 162                 return;
 163
 164         gus->gf1.interrupt_handler_timer1 = snd_gf1_interrupt_timer1;
 165         gus->gf1.interrupt_handler_timer2 = snd_gf1_interrupt_timer2;
 166
 167         tid.dev_class = SNDRV_TIMER_CLASS_CARD;
 168         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 169         tid.card = gus->card->number;
 170         tid.device = gus->timer_dev;
 171         tid.subdevice = 0;
 172
 173         if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
 174                 strcpy(timer->name, "GF1 timer #1");
 175                 timer->private_data = gus;
 176                 timer->private_free = snd_gf1_timer1_free;
 177                 timer->hw = snd_gf1_timer1;
 178         }
 179         gus->gf1.timer1 = timer;
 180
 181         tid.device++;
 182
 183         if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
 184                 strcpy(timer->name, "GF1 timer #2");
 185                 timer->private_data = gus;
 186                 timer->private_free = snd_gf1_timer2_free;
 187                 timer->hw = snd_gf1_timer2;
 188         }
 189         gus->gf1.timer2 = timer;
 190 }
 191
 192 void snd_gf1_timers_done(struct snd_gus_card * gus)
 193 {
 194         snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_TIMER1 | SNDRV_GF1_HANDLER_TIMER2);
 195         if (gus->gf1.timer1) {
 196                 snd_device_free(gus->card, gus->gf1.timer1);
 197                 gus->gf1.timer1 = NULL;
 198         }
 199         if (gus->gf1.timer2) {
 200                 snd_device_free(gus->card, gus->gf1.timer2);
 201                 gus->gf1.timer2 = NULL;
 202         }
 203 }