114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
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/*
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**********************************************************************
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* irqmgr.c - IRQ manager for emu10k1 driver
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* Copyright 1999, 2000 Creative Labs, Inc.
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*
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**********************************************************************
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*
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* Date Author Summary of changes
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* ---- ------ ------------------
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* October 20, 1999 Bertrand Lee base code release
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*
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**********************************************************************
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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**********************************************************************
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*/
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#include "hwaccess.h"
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#include "8010.h"
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#include "cardmi.h"
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#include "cardmo.h"
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#include "irqmgr.h"
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/* Interrupt handler */
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irqreturn_t emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct emu10k1_card *card = (struct emu10k1_card *) dev_id;
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u32 irqstatus, irqstatus_tmp;
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int handled = 0;
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DPD(4, "emu10k1_interrupt called, irq = %u\n", irq);
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/*
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** NOTE :
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** We do a 'while loop' here cos on certain machines, with both
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** playback and recording going on at the same time, IRQs will
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** stop coming in after a while. Checking IPND indeed shows that
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** there are interrupts pending but the PIC says no IRQs pending.
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** I suspect that some boards need edge-triggered IRQs but are not
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** getting that condition if we don't completely clear the IPND
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** (make sure no more interrupts are pending).
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** - Eric
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*/
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while ((irqstatus = inl(card->iobase + IPR))) {
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DPD(4, "irq status %#x\n", irqstatus);
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irqstatus_tmp = irqstatus;
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if (irqstatus & IRQTYPE_TIMER) {
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emu10k1_timer_irqhandler(card);
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irqstatus &= ~IRQTYPE_TIMER;
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}
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if (irqstatus & IRQTYPE_DSP) {
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emu10k1_dsp_irqhandler(card);
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irqstatus &= ~IRQTYPE_DSP;
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}
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if (irqstatus & IRQTYPE_MPUIN) {
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emu10k1_mpuin_irqhandler(card);
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irqstatus &= ~IRQTYPE_MPUIN;
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}
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if (irqstatus & IRQTYPE_MPUOUT) {
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emu10k1_mpuout_irqhandler(card);
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irqstatus &= ~IRQTYPE_MPUOUT;
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}
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if (irqstatus & IPR_MUTE) {
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emu10k1_mute_irqhandler(card);
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irqstatus &=~IPR_MUTE;
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}
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if (irqstatus & IPR_VOLINCR) {
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emu10k1_volincr_irqhandler(card);
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irqstatus &=~IPR_VOLINCR;
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}
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if (irqstatus & IPR_VOLDECR) {
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emu10k1_voldecr_irqhandler(card);
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irqstatus &=~IPR_VOLDECR;
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}
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if (irqstatus){
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printk(KERN_ERR "emu10k1: Warning, unhandled interrupt: %#08x\n", irqstatus);
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//make sure any interrupts we don't handle are disabled:
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emu10k1_irq_disable(card, ~(INTE_MIDIRXENABLE | INTE_MIDITXENABLE | INTE_INTERVALTIMERENB |
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INTE_VOLDECRENABLE | INTE_VOLINCRENABLE | INTE_MUTEENABLE |
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INTE_FXDSPENABLE));
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}
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/* acknowledge interrupt */
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outl(irqstatus_tmp, card->iobase + IPR);
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handled = 1;
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}
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return IRQ_RETVAL(handled);
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}
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