[PATCH] of/address: Add of_iomap_nocache
From: David Brown <hidden>
Date: 2011-08-04 09:54:00
Also in:
linux-arm-msm, lkml
Subsystem:
open firmware and flattened device tree, the rest · Maintainers:
Rob Herring, Saravana Kannan, Linus Torvalds
Add uncached mappings from devicetree nodes similar to regular io mappings. Signed-off-by: David Brown <redacted> --- drivers/of/address.c | 19 +++++++++++++++++++ include/linux/of_address.h | 1 + 2 files changed, 20 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..3ce1277 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h@@ -12,6 +12,7 @@ extern struct device_node *of_find_matching_node_by_address( const struct of_device_id *matches, u64 base_address); extern void __iomem *of_iomap(struct device_node *device, int index); +extern void __iomem *of_iomap_nocache(struct device_node *device, int index); /* Extract an address from a device, returns the region size and * the address space flags too. The PCI version uses a BAR number
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