[PATCH 2.6] ia64 support for PCI link devices

[Chris McDermott <lcm-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

This patch enables correct enablement of interrupts described by
PCI link device entries in the DSDT.

The current ia64 implementation ignores link entries and therefore
prevents such interrupts from being configured correctly.

Comments?

thanks,
-- 
Chris McDermott


--- orig/arch/ia64/kernel/iosapic.c	2004-03-31 16:19:20.000000000 -0800
+++ new/arch/ia64/kernel/iosapic.c	2004-04-05 10:29:11.668281924 -0700
@@ -688,15 +688,23 @@ iosapic_parse_prt (void)
 	char pci_id[16];
 	struct hw_interrupt_type *irq_type = &irq_type_iosapic_level;
 	irq_desc_t *idesc;
+	int trigger = IOSAPIC_LEVEL;
+	int polarity = IOSAPIC_POL_LOW;
 
 	list_for_each(node, &acpi_prt.entries) {
 		entry = list_entry(node, struct acpi_prt_entry, node);
 
-		/* We're only interested in static (non-link) entries.  */
-		if (entry->link.handle)
-			continue;
+		/* Check for dynamic (PCI link) entry. */
+		if (entry->link.handle) {
+			gsi = acpi_pci_link_get_irq(entry->link.handle, entry->link.index, &trigger, &polarity);
+			if (!gsi)
+				continue;
 
-		gsi = entry->link.index;
+			if (trigger == IOSAPIC_EDGE)
+				irq_type = &irq_type_iosapic_edge;
+		} else {
+			gsi = entry->link.index;
+		}
 
 		vector = gsi_to_vector(gsi);
 		if (vector < 0) {
@@ -710,8 +718,12 @@ iosapic_parse_prt (void)
 				/* new GSI; allocate a vector for it */
 				vector = ia64_alloc_vector();
 
-			register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, IOSAPIC_POL_LOW,
-				      IOSAPIC_LEVEL);
+			if (entry->link.handle)
+				register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, polarity,
+					      trigger);
+			else
+				register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, IOSAPIC_POL_LOW,
+					      IOSAPIC_LEVEL);
 		}
 		entry->irq = vector;
 		snprintf(pci_id, sizeof(pci_id), "%02x:%02x:%02x[%c]",
@@ -723,8 +735,8 @@ iosapic_parse_prt (void)
 		 */
 		idesc = irq_descp(vector);
 		if (idesc->handler != irq_type)
-			register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, IOSAPIC_POL_LOW,
-				      IOSAPIC_LEVEL);
+			register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, polarity,
+				      trigger);
 
 	}
 }


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