| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, struct pt_regs *regs) |
| 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 | } |