sys/i386/isa/sound/gus_card.c


/*
 * linux/kernel/chr_drv/sound/gus_card.c
 *
 * Detection routine for the Gravis Ultrasound.
 *
 * (C) 1993  Hannu Savolainen (hsavolai@cs.helsinki.fi) See COPYING for further
 * details. Should be distributed with this file.
 */

#include "sound_config.h"

#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_GUS)

#include "gus_hw.h"

void            gusintr (int);

int             gus_base, gus_irq, gus_dma;

static int
set_gus_irq (int interrupt_level)
{
  int             retcode;

#ifdef linux
  struct sigaction sa;

  sa.sa_handler = gusintr;

#ifdef SND_SA_INTERRUPT
  sa.sa_flags = SA_INTERRUPT;
#else
  sa.sa_flags = 0;
#endif

  sa.sa_mask = 0;
  sa.sa_restorer = NULL;

  retcode = irqaction (interrupt_level, &sa);

  if (retcode < 0)
    {
      printk ("GUS: IRQ%d already in use\n", interrupt_level);
    }

#else
  /* #  error Unimplemented for this OS  */
#endif
  return retcode;
}

int
gus_set_midi_irq (int interrupt_level)
{
  int             retcode;

#ifdef linux
  struct sigaction sa;

  sa.sa_handler = gus_midi_interrupt;

#ifdef SND_SA_INTERRUPT
  sa.sa_flags = SA_INTERRUPT;
#else
  sa.sa_flags = 0;
#endif

  sa.sa_mask = 0;
  sa.sa_restorer = NULL;

  retcode = irqaction (interrupt_level, &sa);

  if (retcode < 0)
    {
      printk ("GUS: IRQ%d already in use\n", interrupt_level);
    }

#else
  /* #  error Unimplemented for this OS  */
#endif
  return retcode;
}

long
attach_gus_card (long mem_start, struct address_info *hw_config)
{
  int             io_addr;

  set_gus_irq (hw_config->irq);

  if (gus_wave_detect (hw_config->io_base))     /* Try first the default */
    {
      mem_start = gus_wave_init (mem_start, hw_config->irq, hw_config->dma);
#ifndef EXCLUDE_MIDI
      mem_start = gus_midi_init (mem_start);
#endif
      return mem_start;
    }

#ifndef EXCLUDE_GUS_IODETECT

  /*
   * Look at the possible base addresses (0x2X0, X=1, 2, 3, 4, 5, 6)
   */

  for (io_addr = 0x210; io_addr <= 0x260; io_addr += 0x10)
    if (io_addr != hw_config->io_base)  /* Already tested */
      if (gus_wave_detect (io_addr))
        {
          printk (" WARNING! GUS found at %03x, config was %03x ", io_addr, hw_config->io_base);
          mem_start = gus_wave_init (mem_start, hw_config->irq, hw_config->dma);
#ifndef EXCLUDE_MIDI
          mem_start = gus_midi_init (mem_start);
#endif
          return mem_start;
        }

#endif

  return mem_start;             /* Not detected */
}

int
probe_gus (struct address_info *hw_config)
{
  int             io_addr;

  if (gus_wave_detect (hw_config->io_base))
    return 1;

#ifndef EXCLUDE_GUS_IODETECT

  /*
   * Look at the possible base addresses (0x2X0, X=1, 2, 3, 4, 5, 6)
   */

  for (io_addr = 0x210; io_addr <= 0x260; io_addr += 0x10)
    if (io_addr != hw_config->io_base)  /* Already tested */
      if (gus_wave_detect (io_addr))
        return 1;

#endif

  return 0;
}

void
gusintr (int unit)
{
  unsigned char   src;
  unsigned long   flags;

  while (1)
    {
      if (!(src = INB (u_IrqStatus)))
        return;

      if (src & DMA_TC_IRQ)
        {
          guswave_dma_irq ();
        }

      if (src & (MIDI_TX_IRQ | MIDI_RX_IRQ))
        {
#ifndef EXCLUDE_MIDI
          gus_midi_interrupt (0);
#endif
        }

      if (src & (GF1_TIMER1_IRQ | GF1_TIMER2_IRQ))
        {
          printk ("T");
          gus_write8 (0x45, 0); /* Timer control */
        }

      if (src & (WAVETABLE_IRQ | ENVELOPE_IRQ))
        {
          DISABLE_INTR (flags);
          gus_voice_irq ();
          RESTORE_INTR (flags);
        }
    }
}

#endif