text: /*
   *  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/driver.h>
  #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
  