release/src-rt-6.x/linux/linux-2.6/sound/oss/emu10k1/irqmgr.c

   1 /*
   2  **********************************************************************
   3  *     irqmgr.c - IRQ manager for emu10k1 driver
   4  *     Copyright 1999, 2000 Creative Labs, Inc.
   5  *
   6  **********************************************************************
   7  *
   8  *     Date                 Author          Summary of changes
   9  *     ----                 ------          ------------------
  10  *     October 20, 1999     Bertrand Lee    base code release
  11  *
  12  **********************************************************************
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     This program is distributed in the hope that it will be useful,
  20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *     GNU General Public License for more details.
  23  *
  24  *     You should have received a copy of the GNU General Public
  25  *     License along with this program; if not, write to the Free
  26  *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
  27  *     USA.
  28  *
  29  **********************************************************************
  30  */
  31
  32 #include "hwaccess.h"
  33 #include "8010.h"
  34 #include "cardmi.h"
  35 #include "cardmo.h"
  36 #include "irqmgr.h"
  37
  38 /* Interrupt handler */
  39
  40 irqreturn_t emu10k1_interrupt(int irq, void *dev_id)
  41 {
  42         struct emu10k1_card *card = (struct emu10k1_card *) dev_id;
  43         u32 irqstatus, irqstatus_tmp;
  44         int handled = 0;
  45
  46         DPD(4, "emu10k1_interrupt called, irq =  %u\n", irq);
  47
  48         /*
  49          ** NOTE :
  50          ** We do a 'while loop' here cos on certain machines, with both
  51          ** playback and recording going on at the same time, IRQs will
  52          ** stop coming in after a while. Checking IPND indeed shows that
  53          ** there are interrupts pending but the PIC says no IRQs pending.
  54          ** I suspect that some boards need edge-triggered IRQs but are not
  55          ** getting that condition if we don't completely clear the IPND
  56          ** (make sure no more interrupts are pending).
  57          ** - Eric
  58          */
  59
  60         while ((irqstatus = inl(card->iobase + IPR))) {
  61                 DPD(4, "irq status %#x\n", irqstatus);
  62
  63                 irqstatus_tmp = irqstatus;
  64
  65                 if (irqstatus & IRQTYPE_TIMER) {
  66                         emu10k1_timer_irqhandler(card);
  67                         irqstatus &= ~IRQTYPE_TIMER;
  68                 }
  69
  70                 if (irqstatus & IRQTYPE_DSP) {
  71                         emu10k1_dsp_irqhandler(card);
  72                         irqstatus &= ~IRQTYPE_DSP;
  73                 }
  74
  75                 if (irqstatus & IRQTYPE_MPUIN) {
  76                         emu10k1_mpuin_irqhandler(card);
  77                         irqstatus &= ~IRQTYPE_MPUIN;
  78                 }
  79
  80                 if (irqstatus & IRQTYPE_MPUOUT) {
  81                         emu10k1_mpuout_irqhandler(card);
  82                         irqstatus &= ~IRQTYPE_MPUOUT;
  83                 }
  84
  85                 if (irqstatus & IPR_MUTE) {
  86                         emu10k1_mute_irqhandler(card);
  87                         irqstatus &=~IPR_MUTE;
  88                 }
  89
  90                 if (irqstatus & IPR_VOLINCR) {
  91                         emu10k1_volincr_irqhandler(card);
  92                         irqstatus &=~IPR_VOLINCR;
  93                 }
  94
  95                 if (irqstatus & IPR_VOLDECR) {
  96                         emu10k1_voldecr_irqhandler(card);
  97                         irqstatus &=~IPR_VOLDECR;
  98                 }
  99
 100                 if (irqstatus){
 101                         printk(KERN_ERR "emu10k1: Warning, unhandled interrupt: %#08x\n", irqstatus);
 102                         //make sure any interrupts we don't handle are disabled:
 103                         emu10k1_irq_disable(card, ~(INTE_MIDIRXENABLE | INTE_MIDITXENABLE | INTE_INTERVALTIMERENB |
 104                                                 INTE_VOLDECRENABLE | INTE_VOLINCRENABLE | INTE_MUTEENABLE |
 105                                                 INTE_FXDSPENABLE));
 106                 }
 107
 108                 /* acknowledge interrupt */
 109                 outl(irqstatus_tmp, card->iobase + IPR);
 110                 handled = 1;
 111         }
 112         return IRQ_RETVAL(handled);
 113 }