From afa910a4edee0b2b76eb7fbcccde4c6185949bc6 Mon Sep 17 00:00:00 2001
From: tsutsui <tsutsui@NetBSD.org>
Date: Sat, 14 Jun 2003 19:11:40 +0000
Subject: [PATCH] Add isa_intr_alloc() for isapnp support.

---
 sys/arch/arc/include/isa_machdep.h |  4 ++-
 sys/arch/arc/isa/isabus.c          | 39 +++++++++++++++++++++++++++++-
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/sys/arch/arc/include/isa_machdep.h b/sys/arch/arc/include/isa_machdep.h
index 71137fd6c637..a5a669f5a730 100644
--- a/sys/arch/arc/include/isa_machdep.h
+++ b/sys/arch/arc/include/isa_machdep.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: isa_machdep.h,v 1.7 2003/05/09 23:51:26 fvdl Exp $	*/
+/*	$NetBSD: isa_machdep.h,v 1.8 2003/06/14 19:11:40 tsutsui Exp $	*/
 /*      $OpenBSD: isa_machdep.h,v 1.5 1997/04/19 17:20:00 pefo Exp $  */
 
 /*
@@ -119,6 +119,8 @@ struct arc_isa_bus {
 #define	isa_mappage(m, o, p)						\
 	_isa_mappage((m), (o), (p))
 
+int isa_intr_alloc(isa_chipset_tag_t, int, int, int *);
+
 void sysbeepstop(void *);
 void sysbeep(int, int);
 
diff --git a/sys/arch/arc/isa/isabus.c b/sys/arch/arc/isa/isabus.c
index 5aa19d2486ea..7dd9090a9c2e 100644
--- a/sys/arch/arc/isa/isabus.c
+++ b/sys/arch/arc/isa/isabus.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: isabus.c,v 1.20 2003/05/25 14:00:15 tsutsui Exp $	*/
+/*	$NetBSD: isabus.c,v 1.21 2003/06/14 19:11:41 tsutsui Exp $	*/
 /*	$OpenBSD: isabus.c,v 1.15 1998/03/16 09:38:46 pefo Exp $	*/
 /*	NetBSD: isa.c,v 1.33 1995/06/28 04:30:51 cgd Exp 	*/
 
@@ -488,3 +488,40 @@ sysbeep(pitch, period)
 	beeping = last_period = period;
 	callout_reset(&sysbeep_ch, period, sysbeepstop, NULL);
 }
+
+int
+isa_intr_alloc(isa_chipset_tag_t c, int mask, int type, int *irq_p)
+{
+	int irq;
+	int maybe_irq = -1;
+	int shared_depth = 0;
+	mask &= 0x8b28; /* choose from 3, 5, 8, 9, 11, 15 XXX */
+	for (irq = 0; mask != 0; mask >>= 1, irq++) {
+		if ((mask & 1) == 0)
+			continue;
+		if (intrtype[irq] == IST_NONE) {
+			*irq_p = irq;
+			return 0;
+		}
+		/* Level interrupts can be shared */
+		if (type == IST_LEVEL && intrtype[irq] == IST_LEVEL) {
+			struct intrhand *ih = intrhand[irq];
+			int depth;
+			if (maybe_irq == -1) {
+ 				maybe_irq = irq;
+				continue;
+			}
+			for (depth = 0; ih != NULL; ih = ih->ih_next)
+				depth++;
+			if (depth < shared_depth) {
+				maybe_irq = irq;
+				shared_depth = depth;
+			}
+		}
+	}
+	if (maybe_irq != -1) {
+		*irq_p = maybe_irq;
+		return 0;
+	}
+	return 1;
+}