Quelle  gus_irq.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Routine for IRQ handling from GF1/InterWave chip
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 */

#include <sound/core.h>
#include <sound/info.h>
#include <sound/gus.h>

#ifdef CONFIG_SND_DEBUG
#define STAT_ADD(x) ((x)++)
#else
#define STAT_ADD(x) while (0) { ; }
#endif

irqreturn_t snd_gus_interrupt(int irq, void *dev_id)
{
 struct snd_gus_card * gus = dev_id;
 unsigned char status;
 int loop = 100;
 int handled = 0;

__again:
 status = inb(gus->gf1.reg_irqstat);
 if (status == 0)
  return IRQ_RETVAL(handled);
 handled = 1;
 if (status & 0x02) {
  STAT_ADD(gus->gf1.interrupt_stat_midi_in);
  if (gus->gf1.interrupt_handler_midi_in)
   gus->gf1.interrupt_handler_midi_in(gus);
 }
 if (status & 0x01) {
  STAT_ADD(gus->gf1.interrupt_stat_midi_out);
  if (gus->gf1.interrupt_handler_midi_out)
   gus->gf1.interrupt_handler_midi_out(gus);
 }
 if (status & (0x20 | 0x40)) {
  unsigned int already, _current_;
  unsigned char voice_status, voice;
  struct snd_gus_voice *pvoice;

  already = 0;
  while (((voice_status = snd_gf1_i_read8(gus, SNDRV_GF1_GB_VOICES_IRQ)) & 0xc0) != 0xc0) {
   voice = voice_status & 0x1f;
   _current_ = 1 << voice;
   if (already & _current_)
    continue; /* multi request */
   already |= _current_; /* mark request */
#if 0
   dev_dbg(gus->card->dev,
    "voice = %i, voice_status = 0x%x, voice_verify = %i\n",
    voice, voice_status, inb(GUSP(gus, GF1PAGE)));
#endif
   pvoice = &gus->gf1.voices[voice]; 
   if (pvoice->use) {
    if (!(voice_status & 0x80)) { /* voice position IRQ */
     STAT_ADD(pvoice->interrupt_stat_wave);
     pvoice->handler_wave(gus, pvoice);
    }
    if (!(voice_status & 0x40)) { /* volume ramp IRQ */
     STAT_ADD(pvoice->interrupt_stat_volume);
     pvoice->handler_volume(gus, pvoice);
    }
   } else {
    STAT_ADD(gus->gf1.interrupt_stat_voice_lost);
    snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
    snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
   }
  }
 }
 if (status & 0x04) {
  STAT_ADD(gus->gf1.interrupt_stat_timer1);
  if (gus->gf1.interrupt_handler_timer1)
   gus->gf1.interrupt_handler_timer1(gus);
 }
 if (status & 0x08) {
  STAT_ADD(gus->gf1.interrupt_stat_timer2);
  if (gus->gf1.interrupt_handler_timer2)
   gus->gf1.interrupt_handler_timer2(gus);
 }
 if (status & 0x80) {
  if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) {
   STAT_ADD(gus->gf1.interrupt_stat_dma_write);
   if (gus->gf1.interrupt_handler_dma_write)
    gus->gf1.interrupt_handler_dma_write(gus);
  }
  if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL) & 0x40) {
   STAT_ADD(gus->gf1.interrupt_stat_dma_read);
   if (gus->gf1.interrupt_handler_dma_read)
    gus->gf1.interrupt_handler_dma_read(gus);
  }
 }
 if (--loop > 0)
  goto __again;
 return IRQ_NONE;
}

#ifdef CONFIG_SND_DEBUG
static void snd_gus_irq_info_read(struct snd_info_entry *entry, 
      struct snd_info_buffer *buffer)
{
 struct snd_gus_card *gus;
 struct snd_gus_voice *pvoice;
 int idx;

 gus = entry->private_data;
 snd_iprintf(buffer, "midi out = %u\n", gus->gf1.interrupt_stat_midi_out);
 snd_iprintf(buffer, "midi in = %u\n", gus->gf1.interrupt_stat_midi_in);
 snd_iprintf(buffer, "timer1 = %u\n", gus->gf1.interrupt_stat_timer1);
 snd_iprintf(buffer, "timer2 = %u\n", gus->gf1.interrupt_stat_timer2);
 snd_iprintf(buffer, "dma write = %u\n", gus->gf1.interrupt_stat_dma_write);
 snd_iprintf(buffer, "dma read = %u\n", gus->gf1.interrupt_stat_dma_read);
 snd_iprintf(buffer, "voice lost = %u\n", gus->gf1.interrupt_stat_voice_lost);
 for (idx = 0; idx < 32; idx++) {
  pvoice = &gus->gf1.voices[idx];
  snd_iprintf(buffer, "voice %i: wave = %u, volume = %u\n",
     idx,
     pvoice->interrupt_stat_wave,
     pvoice->interrupt_stat_volume);
 }
}

void snd_gus_irq_profile_init(struct snd_gus_card *gus)
{
 snd_card_ro_proc_new(gus->card, "gusirq", gus, snd_gus_irq_info_read);
}

#endif