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Index: head/sys/arm/arm/nexus.c
===================================================================
--- head/sys/arm/arm/nexus.c
+++ head/sys/arm/arm/nexus.c
@@ -62,6 +62,8 @@
#include <machine/resource.h>
#include <machine/intr.h>
+#include <arm/arm/nexusvar.h>
+
#ifdef FDT
#include <machine/fdt.h>
#include <dev/ofw/ofw_bus_subr.h>
@@ -87,6 +89,7 @@
static int nexus_activate_resource(device_t, device_t, int, int,
struct resource *);
static bus_space_tag_t nexus_get_bus_tag(device_t, device_t);
+static bus_dma_tag_t nexus_get_dma_tag(device_t dev, device_t child);
#ifdef INTRNG
#ifdef SMP
static int nexus_bind_intr(device_t, device_t, struct resource *, int);
@@ -112,6 +115,13 @@
int icells, pcell_t *intr);
#endif
+/*
+ * Normally NULL (which results in defaults which are handled in
+ * busdma_machdep), platform init code can use nexus_set_dma_tag() to set this
+ * to a tag that will be inherited by all busses and devices on the platform.
+ */
+static bus_dma_tag_t nexus_dma_tag;
+
static device_method_t nexus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, nexus_probe),
@@ -127,6 +137,7 @@
DEVMETHOD(bus_setup_intr, nexus_setup_intr),
DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag),
+ DEVMETHOD(bus_get_dma_tag, nexus_get_dma_tag),
#ifdef INTRNG
DEVMETHOD(bus_describe_intr, nexus_describe_intr),
#ifdef SMP
@@ -273,6 +284,20 @@
#else
return((void *)1);
#endif
+}
+
+static bus_dma_tag_t
+nexus_get_dma_tag(device_t dev, device_t child)
+{
+
+ return nexus_dma_tag;
+}
+
+void
+nexus_set_dma_tag(bus_dma_tag_t tag)
+{
+
+ nexus_dma_tag = tag;
}
static int
Index: head/sys/arm/arm/nexusvar.h
===================================================================
--- head/sys/arm/arm/nexusvar.h
+++ head/sys/arm/arm/nexusvar.h
@@ -0,0 +1,36 @@
+/*-
+ * Copyright (c) 2017 Ian Lepore <ian@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _ARM_ARM_NEXUSVAR_H_
+#define _ARM_ARM_NEXUSVAR_H_
+
+/* Set a platform busdma tag to be inherited by all busses and devices. */
+void nexus_set_dma_tag(bus_dma_tag_t _tag);
+
+#endif
+

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