text: /*
   *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   *                   Creative Labs, Inc.
   *  Routines for IRQ control of EMU10K1 chips
   *
   *  BUGS:
   *    --
   *
   *  TODO:
   *    --
   *
   *   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 <linux/time.h>
  #include <sound/core.h>
  #include <sound/emu10k1.h>
  
  irqreturn_t snd_emu10k1_interrupt(int irq, void *dev_id)
  {
  	struct snd_emu10k1 *emu = dev_id;
  	unsigned int status, status2, orig_status, orig_status2;
  	int handled = 0;
  	int timeout = 0;
  
  	while (((status = inl(emu->port + IPR)) != 0) && (timeout < 1000)) {
  		timeout++;
  		orig_status = status;
  		handled = 1;
  		if ((status & 0xffffffff) == 0xffffffff) {
  			snd_printk(KERN_INFO "snd-emu10k1: Suspected sound card removal\n");
  			break;
  		}
  		if (status & IPR_PCIERROR) {
  			snd_printk(KERN_ERR "interrupt: PCI error\n");
  			snd_emu10k1_intr_disable(emu, INTE_PCIERRORENABLE);
  			status &= ~IPR_PCIERROR;
  		}
  		if (status & (IPR_VOLINCR|IPR_VOLDECR|IPR_MUTE)) {
  			if (emu->hwvol_interrupt)
  				emu->hwvol_interrupt(emu, status);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_VOLINCRENABLE|INTE_VOLDECRENABLE|INTE_MUTEENABLE);
  			status &= ~(IPR_VOLINCR|IPR_VOLDECR|IPR_MUTE);
  		}
  		if (status & IPR_CHANNELLOOP) {
  			int voice;
  			int voice_max = status & IPR_CHANNELNUMBERMASK;
  			u32 val;
  			struct snd_emu10k1_voice *pvoice = emu->voices;
  
  			val = snd_emu10k1_ptr_read(emu, CLIPL, 0);
  			for (voice = 0; voice <= voice_max; voice++) {
  				if (voice == 0x20)
  					val = snd_emu10k1_ptr_read(emu, CLIPH, 0);
  				if (val & 1) {
  					if (pvoice->use && pvoice->interrupt != NULL) {
  						pvoice->interrupt(emu, pvoice);
  						snd_emu10k1_voice_intr_ack(emu, voice);
  					} else {
  						snd_emu10k1_voice_intr_disable(emu, voice);
  					}
  				}
  				val >>= 1;
  				pvoice++;
  			}
  			val = snd_emu10k1_ptr_read(emu, HLIPL, 0);
  			for (voice = 0; voice <= voice_max; voice++) {
  				if (voice == 0x20)
  					val = snd_emu10k1_ptr_read(emu, HLIPH, 0);
  				if (val & 1) {
  					if (pvoice->use && pvoice->interrupt != NULL) {
  						pvoice->interrupt(emu, pvoice);
  						snd_emu10k1_voice_half_loop_intr_ack(emu, voice);
  					} else {
  						snd_emu10k1_voice_half_loop_intr_disable(emu, voice);
  					}
  				}
  				val >>= 1;
  				pvoice++;
  			}
  			status &= ~IPR_CHANNELLOOP;
  		}
  		status &= ~IPR_CHANNELNUMBERMASK;
  		if (status & (IPR_ADCBUFFULL|IPR_ADCBUFHALFFULL)) {
  			if (emu->capture_interrupt)
  				emu->capture_interrupt(emu, status);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_ADCBUFENABLE);
  			status &= ~(IPR_ADCBUFFULL|IPR_ADCBUFHALFFULL);
  		}
  		if (status & (IPR_MICBUFFULL|IPR_MICBUFHALFFULL)) {
  			if (emu->capture_mic_interrupt)
  				emu->capture_mic_interrupt(emu, status);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_MICBUFENABLE);
  			status &= ~(IPR_MICBUFFULL|IPR_MICBUFHALFFULL);
  		}
  		if (status & (IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL)) {
  			if (emu->capture_efx_interrupt)
  				emu->capture_efx_interrupt(emu, status);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_EFXBUFENABLE);
  			status &= ~(IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL);
  		}
  		if (status & (IPR_MIDITRANSBUFEMPTY|IPR_MIDIRECVBUFEMPTY)) {
  			if (emu->midi.interrupt)
  				emu->midi.interrupt(emu, status);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_MIDITXENABLE|INTE_MIDIRXENABLE);
  			status &= ~(IPR_MIDITRANSBUFEMPTY|IPR_MIDIRECVBUFEMPTY);
  		}
  		if (status & (IPR_A_MIDITRANSBUFEMPTY2|IPR_A_MIDIRECVBUFEMPTY2)) {
  			if (emu->midi2.interrupt)
  				emu->midi2.interrupt(emu, status);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_A_MIDITXENABLE2|INTE_A_MIDIRXENABLE2);
  			status &= ~(IPR_A_MIDITRANSBUFEMPTY2|IPR_A_MIDIRECVBUFEMPTY2);
  		}
  		if (status & IPR_INTERVALTIMER) {
  			if (emu->timer)
  				snd_timer_interrupt(emu->timer, emu->timer->sticks);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
  			status &= ~IPR_INTERVALTIMER;
  		}
  		if (status & (IPR_GPSPDIFSTATUSCHANGE|IPR_CDROMSTATUSCHANGE)) {
  			if (emu->spdif_interrupt)
  				emu->spdif_interrupt(emu, status);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_GPSPDIFENABLE|INTE_CDSPDIFENABLE);
  			status &= ~(IPR_GPSPDIFSTATUSCHANGE|IPR_CDROMSTATUSCHANGE);
  		}
  		if (status & IPR_FXDSP) {
  			if (emu->dsp_interrupt)
  				emu->dsp_interrupt(emu);
  			else
  				snd_emu10k1_intr_disable(emu, INTE_FXDSPENABLE);
  			status &= ~IPR_FXDSP;
  		}
  		if (status & IPR_P16V) {
  			while ((status2 = inl(emu->port + IPR2)) != 0) {
  				u32 mask = INTE2_PLAYBACK_CH_0_LOOP;  /* Full Loop */
  				struct snd_emu10k1_voice *pvoice = &(emu->p16v_voices[0]);
  				struct snd_emu10k1_voice *cvoice = &(emu->p16v_capture_voice);
  
  				//printk(KERN_INFO "status2=0x%x\n", status2);
  				orig_status2 = status2;
  				if(status2 & mask) {
  					if(pvoice->use) {
  						snd_pcm_period_elapsed(pvoice->epcm->substream);
  					} else { 
  						snd_printk(KERN_ERR "p16v: status: 0x%08x, mask=0x%08x, pvoice=%p, use=%d\n", status2, mask, pvoice, pvoice->use);
  					}
  				}
  				if(status2 & 0x110000) {
  					//printk(KERN_INFO "capture int found\n");
  					if(cvoice->use) {
  						//printk(KERN_INFO "capture period_elapsed\n");
  						snd_pcm_period_elapsed(cvoice->epcm->substream);
  					}
  				}
  				outl(orig_status2, emu->port + IPR2); /* ack all */
  			}
  			status &= ~IPR_P16V;
  		}
  
  		if (status) {
  			unsigned int bits;
  			snd_printk(KERN_ERR "emu10k1: unhandled interrupt: 0x%08x\n", status);
  			//make sure any interrupts we don't handle are disabled:
  			bits = INTE_FXDSPENABLE |
  				INTE_PCIERRORENABLE |
  				INTE_VOLINCRENABLE |
  				INTE_VOLDECRENABLE |
  				INTE_MUTEENABLE |
  				INTE_MICBUFENABLE |
  				INTE_ADCBUFENABLE |
  				INTE_EFXBUFENABLE |
  				INTE_GPSPDIFENABLE |
  				INTE_CDSPDIFENABLE |
  				INTE_INTERVALTIMERENB |
  				INTE_MIDITXENABLE |
  				INTE_MIDIRXENABLE;
  			if (emu->audigy)
  				bits |= INTE_A_MIDITXENABLE2 | INTE_A_MIDIRXENABLE2;
  			snd_emu10k1_intr_disable(emu, bits);
  		}
  		outl(orig_status, emu->port + IPR); /* ack all */
  	}
  	if (timeout == 1000)
  		snd_printk(KERN_INFO "emu10k1 irq routine failure\n");
  
  	return IRQ_RETVAL(handled);
  }
  