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gus_irq.c

/*
 *  Routine for IRQ handling from GF1/InterWave chip
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#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;
      // snd_printk("IRQ: status = 0x%x\n", status);
      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
                  printk("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)
{
      struct snd_info_entry *entry;

      if (! snd_card_proc_new(gus->card, "gusirq", &entry))
            snd_info_set_text_ops(entry, gus, snd_gus_irq_info_read);
}

#endif

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