Add uncached mappings from devicetree nodes similar to regular io
mappings.

SPARC is coherent, so there this call is the same as regular of_iomap.

Cc: David Miller <davem@davemloft.net>
Signed-off-by: David Brown <redacted>
---
v2 - Add implementation for SPARC

drivers/of/address.c       |   19 +++++++++++++++++++
include/linux/of_address.h |   10 ++++++++++
2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 72c33fb..9bee7f8 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c

@@ -613,3 +613,22 @@ void __iomem *of_iomap(struct device_node *np, int index)

	return ioremap(res.start, resource_size(&res));
}
EXPORT_SYMBOL(of_iomap);
+
+/**
+ * of_iomap_nocache - Maps the memory mapped IO for a given
+ *                    device_node, using ioremap_nocache.
+ * @device:	the device whose io range will be mapped
+ * @index:	index of the io range
+ *
+ * Returns a pointer to the mapped memory
+ */
+void __iomem *of_iomap_nocache(struct device_node *np, int index)
+{
+	struct resource res;
+
+	if (of_address_to_resource(np, index, &res))
+		return NULL;
+
+	return ioremap_nocache(res.start, 1 + res.end - res.start);
+}
+EXPORT_SYMBOL(of_iomap_nocache);

diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index 3118623..0e4734b 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h

@@ -13,6 +13,16 @@ extern struct device_node *of_find_matching_node_by_address(

					u64 base_address);
extern void __iomem *of_iomap(struct device_node *device, int index);

+#ifndef SPARC
+extern void __iomem *of_iomap_nocache(struct device_node *device, int index);
+#else
+static inline void __iomem *of_iomap_nocache(struct device_node *device,
+		int index)
+{
+	return of_iomap(device, index);
+}
+#endif
+