irqmgr.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:3k
- /*
- **********************************************************************
- * irqmgr.c - IRQ manager for emu10k1 driver
- * Copyright 1999, 2000 Creative Labs, Inc.
- *
- **********************************************************************
- *
- * Date Author Summary of changes
- * ---- ------ ------------------
- * October 20, 1999 Bertrand Lee base code release
- *
- **********************************************************************
- *
- * 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., 675 Mass Ave, Cambridge, MA 02139,
- * USA.
- *
- **********************************************************************
- */
- #include "hwaccess.h"
- #include "8010.h"
- #include "cardmi.h"
- #include "cardmo.h"
- #include "irqmgr.h"
- /* Interrupt handler */
- void emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
- {
- struct emu10k1_card *card = (struct emu10k1_card *) dev_id;
- u32 irqstatus, irqstatus_tmp;
- DPD(4, "emu10k1_interrupt called, irq = %un", irq);
- /*
- ** NOTE :
- ** We do a 'while loop' here cos on certain machines, with both
- ** playback and recording going on at the same time, IRQs will
- ** stop coming in after a while. Checking IPND indeed shows that
- ** there are interrupts pending but the PIC says no IRQs pending.
- ** I suspect that some boards need edge-triggered IRQs but are not
- ** getting that condition if we don't completely clear the IPND
- ** (make sure no more interrupts are pending).
- ** - Eric
- */
- while ((irqstatus = inl(card->iobase + IPR))) {
- DPD(4, "irq status %#xn", irqstatus);
- irqstatus_tmp = irqstatus;
- if (irqstatus & IRQTYPE_TIMER) {
- emu10k1_timer_irqhandler(card);
- irqstatus &= ~IRQTYPE_TIMER;
- }
- if (irqstatus & IRQTYPE_DSP) {
- emu10k1_dsp_irqhandler(card);
- irqstatus &= ~IRQTYPE_DSP;
- }
- if (irqstatus & IRQTYPE_MPUIN) {
- emu10k1_mpuin_irqhandler(card);
- irqstatus &= ~IRQTYPE_MPUIN;
- }
- if (irqstatus & IRQTYPE_MPUOUT) {
- emu10k1_mpuout_irqhandler(card);
- irqstatus &= ~IRQTYPE_MPUOUT;
- }
- if (irqstatus & IPR_MUTE) {
- emu10k1_mute_irqhandler(card);
- irqstatus &=~IPR_MUTE;
- }
- if (irqstatus & IPR_VOLINCR) {
- emu10k1_volincr_irqhandler(card);
- irqstatus &=~IPR_VOLINCR;
- }
- if (irqstatus & IPR_VOLDECR) {
- emu10k1_voldecr_irqhandler(card);
- irqstatus &=~IPR_VOLDECR;
- }
- if (irqstatus){
- printk(KERN_ERR "emu10k1: Warning, unhandled interrupt: %#08xn", irqstatus);
- //make sure any interrupts we don't handle are disabled:
- emu10k1_irq_disable(card, ~(INTE_MIDIRXENABLE | INTE_MIDITXENABLE | INTE_INTERVALTIMERENB |
- INTE_VOLDECRENABLE | INTE_VOLINCRENABLE | INTE_MUTEENABLE |
- INTE_FXDSPENABLE));
- }
- /* acknowledge interrupt */
- outl(irqstatus_tmp, card->iobase + IPR);
- }
- }