IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-2.6.git] / 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 }