patch-2.2.17 linux/drivers/sound/emu10k1/irqmgr.c

• Lines: 93
• Date: Mon Sep 4 18:39:21 2000
• Orig file: v2.2.16/drivers/sound/emu10k1/irqmgr.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --recursive --new-file v2.2.16/drivers/sound/emu10k1/irqmgr.c linux/drivers/sound/emu10k1/irqmgr.c
@@ -0,0 +1,92 @@
+
+/*
+ **********************************************************************
+ *     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, tmp;
+
+	if (!(irqstatus = emu10k1_readfn0(card, IPR)))
+		return;
+
+	DPD(4, "emu10k1_interrupt called, irq =  %u\n", 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
+	 */
+
+	do {
+		DPD(4, "irq status %x\n", irqstatus);
+
+		tmp = irqstatus;
+
+		if (irqstatus & IRQTYPE_TIMER) {
+			emu10k1_timer_irqhandler(card);
+			irqstatus &= ~IRQTYPE_TIMER;
+		}
+
+		if (irqstatus & IRQTYPE_MPUIN) {
+			emu10k1_mpuin_irqhandler(card);
+			irqstatus &= ~IRQTYPE_MPUIN;
+		}
+
+		if (irqstatus & IRQTYPE_MPUOUT) {
+			emu10k1_mpuout_irqhandler(card);
+			irqstatus &= ~IRQTYPE_MPUOUT;
+		}
+
+		if (irqstatus)
+			emu10k1_irq_disable(card, irqstatus);
+
+		emu10k1_writefn0(card, IPR, tmp);
+
+	} while ((irqstatus = emu10k1_readfn0(card, IPR)));
+
+	return;
+}
+