From 818f49fc98b179fdcdcdda84c11ff6f1eabeaee6 Mon Sep 17 00:00:00 2001
From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sat, 4 Jan 2014 20:59:03 +0000
Subject: [PATCH] Implement OFW_BUS_MAP_INTR() in terms of the FDT PIC table,
 which will become an ARM-specific quirk.

---
 sys/arm/arm/nexus.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/sys/arm/arm/nexus.c b/sys/arm/arm/nexus.c
index 94f3c379361..5c02e2aa3c7 100644
--- a/sys/arm/arm/nexus.c
+++ b/sys/arm/arm/nexus.c
@@ -64,7 +64,9 @@ __FBSDID("$FreeBSD$");
 
 #ifdef FDT
 #include <dev/ofw/ofw_nexus.h>
+#include <dev/fdt/fdt_common.h>
 #include <machine/fdt.h>
+#include "ofw_bus_if.h"
 #else
 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
 
@@ -94,6 +96,11 @@ static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
     int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
 
+#ifdef FDT
+static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent,
+    int irq);
+#endif
+
 static device_method_t nexus_methods[] = {
 #ifndef FDT
 	/* Device interface */
@@ -109,6 +116,9 @@ static device_method_t nexus_methods[] = {
 	DEVMETHOD(bus_deactivate_resource,	nexus_deactivate_resource),
 	DEVMETHOD(bus_setup_intr,	nexus_setup_intr),
 	DEVMETHOD(bus_teardown_intr,	nexus_teardown_intr),
+#ifdef FDT
+	DEVMETHOD(ofw_bus_map_intr,	nexus_ofw_map_intr),
+#endif
 	{ 0, 0 }
 };
 
@@ -300,3 +310,33 @@ nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
 	return (rman_deactivate_resource(res));
 }
 
+#ifdef FDT
+static int
+nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int irq)
+{
+	pcell_t intr[2];
+	fdt_pic_decode_t intr_decode;
+	phandle_t intr_offset;
+	int i, rv, interrupt, trig, pol;
+
+	intr_offset = OF_xref_phandle(iparent);
+	intr[0] = cpu_to_fdt32(irq);
+
+	for (i = 0; fdt_pic_table[i] != NULL; i++) {
+		intr_decode = fdt_pic_table[i];
+		rv = intr_decode(intr_offset, intr, &interrupt, &trig, &pol);
+
+		if (rv == 0) {
+			/* This was recognized as our PIC and decoded. */
+			interrupt = FDT_MAP_IRQ(intr_parent, interrupt);
+			return (interrupt);
+		}
+	}
+
+	/* Not in table, so guess */
+	interrupt = FDT_MAP_IRQ(intr_parent, fdt32_to_cpu(*intr));
+
+	return (interrupt);
+}
+#endif
+