| 1 | /* $Id: irqmgr.c 142 2000-04-23 14:55:46Z ktk $ */
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| 2 |
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| 3 |
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| 4 | /*
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| 5 | **********************************************************************
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| 6 | * irqmgr.c - IRQ manager for emu10k1 driver
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| 7 | * Copyright 1999, 2000 Creative Labs, Inc.
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| 8 | *
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| 9 | **********************************************************************
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| 10 | *
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| 11 | * Date Author Summary of changes
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| 12 | * ---- ------ ------------------
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| 13 | * October 20, 1999 Bertrand Lee base code release
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| 14 | *
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| 15 | **********************************************************************
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| 16 | *
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| 17 | * This program is free software; you can redistribute it and/or
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| 18 | * modify it under the terms of the GNU General Public License as
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| 19 | * published by the Free Software Foundation; either version 2 of
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| 20 | * the License, or (at your option) any later version.
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| 21 | *
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| 22 | * This program is distributed in the hope that it will be useful,
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| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 25 | * GNU General Public License for more details.
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| 26 | *
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| 27 | * You should have received a copy of the GNU General Public
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| 28 | * License along with this program; if not, write to the Free
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| 29 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
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| 30 | * USA.
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| 31 | *
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| 32 | **********************************************************************
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| 33 | */
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| 34 |
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| 35 | #include "hwaccess.h"
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| 36 | #include "cardmi.h"
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| 37 | #include "cardmo.h"
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| 38 | #include "irqmgr.h"
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| 39 |
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| 40 | /* Interrupt handler */
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| 41 |
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| 42 | void emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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| 43 | {
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| 44 | struct emu10k1_card *card = (struct emu10k1_card *) dev_id;
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| 45 | u32 irqstatus, ptr, tmp;
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| 46 | #ifdef TARGET_OS2
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| 47 | int fOurIrq = FALSE;
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| 48 | #endif
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| 49 |
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| 50 | if (!(irqstatus = sblive_readfn0(card, IPR)))
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| 51 | return;
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| 52 |
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| 53 | DPD(4, "emu10k1_interrupt called, irq = %u\n", irq);
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| 54 |
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| 55 | /* Preserve PTR register */
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| 56 | ptr = sblive_readfn0(card, PTR);
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| 57 |
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| 58 | /*
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| 59 | ** NOTE :
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| 60 | ** We do a 'while loop' here cos on certain machines, with both
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| 61 | ** playback and recording going on at the same time, IRQs will
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| 62 | ** stop coming in after a while. Checking IPND indeed shows that
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| 63 | ** there are interrupts pending but the PIC says no IRQs pending.
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| 64 | ** I suspect that some boards need edge-triggered IRQs but are not
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| 65 | ** getting that condition if we don't completely clear the IPND
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| 66 | ** (make sure no more interrupts are pending).
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| 67 | ** - Eric
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| 68 | */
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| 69 |
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| 70 | do {
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| 71 | DPD(4, "irq status %x\n", irqstatus);
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| 72 |
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| 73 | tmp = irqstatus;
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| 74 |
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| 75 | #ifdef TARGET_OS2
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| 76 | if (irqstatus & (IRQTYPE_PCIBUSERROR|IRQTYPE_MIXERBUTTON|IRQTYPE_VOICE|IRQTYPE_RECORD|IRQTYPE_MPUIN|IRQTYPE_TIMER|IRQTYPE_MPUOUT|IRQTYPE_DSP|IRQTYPE_SPDIF))
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| 77 | {
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| 78 | fOurIrq = TRUE;
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| 79 | }
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| 80 | #endif
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| 81 |
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| 82 | if (irqstatus & IRQTYPE_TIMER) {
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| 83 | emu10k1_timer_irqhandler(card);
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| 84 | irqstatus &= ~IRQTYPE_TIMER;
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| 85 | }
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| 86 |
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| 87 | if (irqstatus & IRQTYPE_MPUIN) {
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| 88 | emu10k1_mpuin_irqhandler(card);
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| 89 | irqstatus &= ~IRQTYPE_MPUIN;
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| 90 | }
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| 91 |
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| 92 | if (irqstatus & IRQTYPE_MPUOUT) {
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| 93 | emu10k1_mpuout_irqhandler(card);
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| 94 | irqstatus &= ~IRQTYPE_MPUOUT;
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| 95 | }
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| 96 |
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| 97 | if (irqstatus)
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| 98 | emu10k1_irq_disable(card, irqstatus);
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| 99 |
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| 100 | sblive_writefn0(card, IPR, tmp);
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| 101 |
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| 102 | } while ((irqstatus = sblive_readfn0(card, IPR)));
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| 103 |
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| 104 | #ifdef TARGET_OS2
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| 105 | if (fOurIrq) {
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| 106 | eoi_irq(irq);
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| 107 | }
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| 108 | #endif //TARGET_OS2
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| 109 | sblive_writefn0(card, PTR, ptr);
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| 110 |
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| 111 | return;
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| 112 | }
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| 113 |
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| 114 | /* Enables the specified irq service */
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| 115 |
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| 116 | int emu10k1_irq_enable(struct emu10k1_card *card, u32 irqtype)
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| 117 | {
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| 118 | /*
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| 119 | * TODO :
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| 120 | * put protection here so that we don't accidentally
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| 121 | * screw-up another cardxxx objects irqs
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| 122 | */
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| 123 |
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| 124 | DPD(4, "emu10k1_irq_enable %x\n", irqtype);
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| 125 | sblive_wrtmskfn0(card, INTE, irqtype, ENABLE);
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| 126 |
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| 127 | return CTSTATUS_SUCCESS;
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| 128 | }
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| 129 |
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| 130 | /* Disables the specified irq service */
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| 131 |
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| 132 | int emu10k1_irq_disable(struct emu10k1_card *card, u32 irqtype)
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| 133 | {
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| 134 | /*
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| 135 | * TODO :
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| 136 | * put protection here so that we don't accidentally
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| 137 | * screw-up another cardxxx objects irqs
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| 138 | */
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| 139 |
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| 140 | DPD(4, "emu10k1_irq_disable %x\n", irqtype);
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| 141 | sblive_wrtmskfn0(card, INTE, irqtype, DISABLE);
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| 142 |
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| 143 | return CTSTATUS_SUCCESS;
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| 144 | }
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