ae28ee13b4
Amancio. There is some SoundSource support here that is primitive and probably doesn't work, but I'll let the two submitters let me know how my integration of that was since I don't have this card to test. I've only tested this on my GUS MAX since it's all I have. This all probably needs to be re-done anyway since we're widely variant from the original VOXWARE source in the current layout. Submitted by: Amancio Hasty and Jim Lowe Obtained from: Hannu Savolainen
407 lines
8.2 KiB
C
407 lines
8.2 KiB
C
/*
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* sound/sound_timer.c
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*
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* Timer for the level 2 interface of the /dev/sequencer. Uses the
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* 80 and 320 usec timers of OPL-3 (PAS16 only) and GUS.
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#define SEQUENCER_C
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#include "sound_config.h"
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#ifdef CONFIGURE_SOUNDCARD
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#if !defined(EXCLUDE_SEQUENCER) && (!defined(EXCLUDE_GUS) || (!defined(EXCLUDE_PAS) && !defined(EXCLUDE_YM3812)))
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static volatile int initialized = 0, opened = 0, tmr_running = 0;
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static volatile time_t tmr_offs, tmr_ctr;
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static volatile unsigned long ticks_offs;
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static volatile int curr_tempo, curr_timebase;
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static volatile unsigned long curr_ticks;
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static volatile unsigned long next_event_time;
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static unsigned long prev_event_time;
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static volatile int select_addr, data_addr;
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static volatile int curr_timer = 0;
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static volatile unsigned long usecs_per_tmr; /* Length of the current interval */
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static void
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timer_command (unsigned int addr, unsigned int val)
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{
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int i;
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OUTB ((unsigned char) (addr & 0xff), select_addr);
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for (i = 0; i < 2; i++)
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INB (select_addr);
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OUTB ((unsigned char) (val & 0xff), data_addr);
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for (i = 0; i < 2; i++)
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INB (select_addr);
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}
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static void
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arm_timer (int timer, unsigned int interval)
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{
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curr_timer = timer;
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if (timer == 1)
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{
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gus_write8 (0x46, 256 - interval); /* Set counter for timer 1 */
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gus_write8 (0x45, 0x04); /* Enable timer 1 IRQ */
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timer_command (0x04, 0x01); /* Start timer 1 */
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}
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else
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{
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gus_write8 (0x47, 256 - interval); /* Set counter for timer 2 */
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gus_write8 (0x45, 0x08); /* Enable timer 2 IRQ */
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timer_command (0x04, 0x02); /* Start timer 2 */
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}
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}
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static unsigned long
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tmr2ticks (int tmr_value)
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{
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/*
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* Convert timer ticks to MIDI ticks
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*/
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unsigned long tmp;
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unsigned long scale;
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tmp = tmr_value * usecs_per_tmr; /* Convert to usecs */
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scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */
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return (tmp + (scale / 2)) / scale;
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}
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static void
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reprogram_timer (void)
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{
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unsigned long usecs_per_tick;
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int timer_no, resolution;
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int divisor;
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usecs_per_tick = (60 * 1000000) / (curr_tempo * curr_timebase);
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/*
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* Don't kill the system by setting too high timer rate
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*/
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if (usecs_per_tick < 2000)
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usecs_per_tick = 2000;
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if (usecs_per_tick > (256 * 80))
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{
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timer_no = 2;
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resolution = 320; /* usec */
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}
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else
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{
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timer_no = 1;
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resolution = 80; /* usec */
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}
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divisor = (usecs_per_tick + (resolution / 2)) / resolution;
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usecs_per_tmr = divisor * resolution;
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arm_timer (timer_no, divisor);
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}
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static void
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tmr_reset (void)
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{
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unsigned long flags;
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DISABLE_INTR (flags);
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tmr_offs = 0;
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ticks_offs = 0;
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tmr_ctr = 0;
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next_event_time = 0xffffffff;
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prev_event_time = 0;
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curr_ticks = 0;
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RESTORE_INTR (flags);
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}
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static int
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timer_open (int dev, int mode)
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{
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if (opened)
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return RET_ERROR (EBUSY);
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tmr_reset ();
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curr_tempo = 60;
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curr_timebase = HZ;
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opened = 1;
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reprogram_timer ();
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return 0;
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}
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static void
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timer_close (int dev)
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{
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opened = tmr_running = 0;
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gus_write8 (0x45, 0); /* Disable both timers */
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}
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static int
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timer_event (int dev, unsigned char *event)
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{
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unsigned char cmd = event[1];
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unsigned long parm = *(int *) &event[4];
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switch (cmd)
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{
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case TMR_WAIT_REL:
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parm += prev_event_time;
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case TMR_WAIT_ABS:
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if (parm > 0)
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{
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long time;
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if (parm <= curr_ticks) /* It's the time */
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return TIMER_NOT_ARMED;
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time = parm;
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next_event_time = prev_event_time = time;
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return TIMER_ARMED;
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}
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break;
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case TMR_START:
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tmr_reset ();
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tmr_running = 1;
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reprogram_timer ();
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break;
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case TMR_STOP:
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tmr_running = 0;
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break;
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case TMR_CONTINUE:
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tmr_running = 1;
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reprogram_timer ();
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break;
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case TMR_TEMPO:
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if (parm)
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{
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if (parm < 8)
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parm = 8;
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if (parm > 250)
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parm = 250;
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tmr_offs = tmr_ctr;
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ticks_offs += tmr2ticks (tmr_ctr);
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tmr_ctr = 0;
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curr_tempo = parm;
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reprogram_timer ();
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}
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break;
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case TMR_ECHO:
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seq_copy_to_input (event, 8);
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break;
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default:;
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}
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return TIMER_NOT_ARMED;
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}
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static unsigned long
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timer_get_time (int dev)
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{
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if (!opened)
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return 0;
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return curr_ticks;
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}
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static int
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timer_ioctl (int dev,
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unsigned int cmd, unsigned int arg)
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{
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switch (cmd)
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{
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case SNDCTL_TMR_SOURCE:
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return IOCTL_OUT (arg, TMR_INTERNAL);
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break;
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case SNDCTL_TMR_START:
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tmr_reset ();
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tmr_running = 1;
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return 0;
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break;
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case SNDCTL_TMR_STOP:
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tmr_running = 0;
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return 0;
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break;
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case SNDCTL_TMR_CONTINUE:
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tmr_running = 1;
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return 0;
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break;
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case SNDCTL_TMR_TIMEBASE:
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{
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int val = IOCTL_IN (arg);
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if (val)
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{
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if (val < 1)
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val = 1;
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if (val > 1000)
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val = 1000;
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curr_timebase = val;
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}
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return IOCTL_OUT (arg, curr_timebase);
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}
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break;
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case SNDCTL_TMR_TEMPO:
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{
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int val = IOCTL_IN (arg);
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if (val)
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{
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if (val < 8)
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val = 8;
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if (val > 250)
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val = 250;
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tmr_offs = tmr_ctr;
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ticks_offs += tmr2ticks (tmr_ctr);
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tmr_ctr = 0;
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curr_tempo = val;
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reprogram_timer ();
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}
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return IOCTL_OUT (arg, curr_tempo);
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}
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break;
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case SNDCTL_SEQ_CTRLRATE:
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if (IOCTL_IN (arg) != 0) /* Can't change */
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return RET_ERROR (EINVAL);
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return IOCTL_OUT (arg, ((curr_tempo * curr_timebase) + 30) / 60);
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break;
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case SNDCTL_TMR_METRONOME:
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/* NOP */
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break;
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default:
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}
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return RET_ERROR (EINVAL);
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}
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static void
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timer_arm (int dev, long time)
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{
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if (time < 0)
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time = curr_ticks + 1;
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else if (time <= curr_ticks) /* It's the time */
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return;
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next_event_time = prev_event_time = time;
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return;
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}
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static struct sound_timer_operations sound_timer =
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{
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{"OPL-3/GUS Timer", 0},
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1, /* Priority */
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0, /* Local device link */
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timer_open,
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timer_close,
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timer_event,
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timer_get_time,
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timer_ioctl,
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timer_arm
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};
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void
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sound_timer_interrupt (void)
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{
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gus_write8 (0x45, 0); /* Ack IRQ */
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timer_command (4, 0x80); /* Reset IRQ flags */
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if (!opened)
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return;
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if (curr_timer == 1)
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gus_write8 (0x45, 0x04); /* Start timer 1 again */
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else
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gus_write8 (0x45, 0x08); /* Start timer 2 again */
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if (!tmr_running)
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return;
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tmr_ctr++;
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curr_ticks = ticks_offs + tmr2ticks (tmr_ctr);
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if (curr_ticks >= next_event_time)
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{
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next_event_time = 0xffffffff;
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sequencer_timer ();
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}
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}
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void
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sound_timer_init (int io_base)
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{
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int n;
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if (initialized)
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return; /* There is already a similar timer */
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select_addr = io_base;
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data_addr = io_base + 1;
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initialized = 1;
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#if 1
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if (num_sound_timers >= MAX_TIMER_DEV)
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n = 0; /* Overwrite the system timer */
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else
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n = num_sound_timers++;
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#else
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n = 0;
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#endif
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sound_timer_devs[n] = &sound_timer;
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}
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#endif
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#endif
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