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authorHiroshi Doyu <hdoyu@nvidia.com>2012-06-25 15:23:54 +0400
committerJoerg Roedel <joerg.roedel@amd.com>2012-06-25 15:50:28 +0400
commit4e0ee78f2af96676c9dca898c13250f62c513058 (patch)
treeb6851b6678d8a99a6c158a18f210442e545f78c3 /include/linux/of_iommu.h
parent485802a6c524e62b5924849dd727ddbb1497cc71 (diff)
downloadlinux-4e0ee78f2af96676c9dca898c13250f62c513058.tar.xz
iommu: Add DMA window parser, of_get_dma_window()
This code was based on: "arch/microblaze/kernel/prom_parse.c" "arch/powerpc/kernel/prom_parse.c" Can replace "of_parse_dma_window()" in the above. This supports different formats flexibly. "prefix" can be configured if any. "busno" and "index" are optionally specified. Set NULL and 0 if not used. Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux/of_iommu.h')
-rw-r--r--include/linux/of_iommu.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
new file mode 100644
index 000000000000..51a560f34bca
--- /dev/null
+++ b/include/linux/of_iommu.h
@@ -0,0 +1,21 @@
+#ifndef __OF_IOMMU_H
+#define __OF_IOMMU_H
+
+#ifdef CONFIG_OF_IOMMU
+
+extern int of_get_dma_window(struct device_node *dn, const char *prefix,
+ int index, unsigned long *busno, dma_addr_t *addr,
+ size_t *size);
+
+#else
+
+static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
+ int index, unsigned long *busno, dma_addr_t *addr,
+ size_t *size)
+{
+ return -EINVAL;
+}
+
+#endif /* CONFIG_OF_IOMMU */
+
+#endif /* __OF_IOMMU_H */