From ac22e2be433298054c835baf9d09bec8e1434654 Mon Sep 17 00:00:00 2001
From: Mark Kettenis <kettenis@cvs.openbsd.org>
Date: Sun, 19 Apr 2009 15:13:07 +0000
Subject: Fix interrupt mapping for devices behind PCI-PCI bridges.

ok miod@
---
 sys/arch/sgi/pci/macepcibridge.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

(limited to 'sys/arch')

diff --git a/sys/arch/sgi/pci/macepcibridge.c b/sys/arch/sgi/pci/macepcibridge.c
index 338312a4397..9b140e68855 100644
--- a/sys/arch/sgi/pci/macepcibridge.c
+++ b/sys/arch/sgi/pci/macepcibridge.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: macepcibridge.c,v 1.19 2009/04/18 19:26:16 miod Exp $ */
+/*	$OpenBSD: macepcibridge.c,v 1.20 2009/04/19 15:13:06 kettenis Exp $ */
 
 /*
  * Copyright (c) 2001-2004 Opsycon AB (www.opsycon.se)
@@ -46,6 +46,7 @@
 
 #include <dev/pci/pcireg.h>
 #include <dev/pci/pcivar.h>
+#include <dev/pci/ppbreg.h>
 
 #include <mips64/archtype.h>
 #include <sgi/localbus/crimebus.h>
@@ -397,7 +398,7 @@ mace_pcibr_conf_write(cpv, tag, offset, data)
 int
 mace_pcibr_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
 {
-	int bus, device, pirq;
+	int bus, dev, pin = pa->pa_rawintrpin;
 	static const signed char intrmap[][PCI_INTERRUPT_PIN_MAX] = {
 		{ -1, -1, -1, -1 },
 		{ 9, -1, -1, -1 },	/* ahc0 */
@@ -409,25 +410,30 @@ mace_pcibr_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
 
 	*ihp = -1;
 
-	if (pa->pa_intrpin == 0) {
+	if (pin == 0) {
 		/* No IRQ used. */
 		return 1;
 	}
 #ifdef DIAGNOSTIC
-	if (pa->pa_intrpin > 4) {
-		printf("mace_pcibr_intr_map: bad interrupt pin %d\n", pa->pa_intrpin);
+	if (pin > PCI_INTERRUPT_PIN_MAX) {
+		printf("mace_pcibr_intr_map: bad interrupt pin %d\n", pin);
 		return 1;
 	}
 #endif
 
-	pci_decompose_tag(pa->pa_pc, pa->pa_intrtag, &bus, &device, NULL);
+	pci_decompose_tag(pa->pa_pc, pa->pa_tag, &bus, &dev, NULL);
 
-	pirq = -1;
-	if ((unsigned int)device < sizeof(intrmap) / PCI_INTERRUPT_PIN_MAX)
-		pirq = intrmap[device][pa->pa_intrpin - PCI_INTERRUPT_PIN_A];
+	if (pa->pa_bridgetag) {
+		pin = PPB_INTERRUPT_SWIZZLE(pin, dev);
+		*ihp = pa->pa_bridgeih[pin - PCI_INTERRUPT_PIN_A];
 
-	*ihp = pirq;
-	return pirq >= 0 ? 0 : 1;
+		return ((*ihp == -1) ? 1 : 0);
+	}
+
+	if (dev < nitems(intrmap))
+		*ihp = intrmap[dev][pin - PCI_INTERRUPT_PIN_A];
+
+	return ((*ihp == -1) ? 1 : 0);
 }
 
 const char *
-- 
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