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Subject[RFC 3/5] ARM: OMAP: iommu: declare a private iommu binding struct
Date
Declare an omap iommu private struct, which binds an iommu user
to its iommu device. This struct should be placed at the iommu user's
dev_archdata so generic IOMMU API can be used without having to
utilize omap-specific plumbing anymore.

While at it, provide an accessor method to ease the retrieval of the
omap_iommu handle from a user device.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
---
arch/arm/plat-omap/include/plat/iommu.h | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/include/plat/iommu.h b/arch/arm/plat-omap/include/plat/iommu.h
index a1d79ee..fa11ee2 100644
--- a/arch/arm/plat-omap/include/plat/iommu.h
+++ b/arch/arm/plat-omap/include/plat/iommu.h
@@ -111,6 +111,32 @@ struct iommu_platform_data {
u32 da_end;
};

+/**
+ * struct iommu_arch_data - omap iommu private data
+ * @name: name of the iommu device
+ * @iommu_dev: handle of the iommu device
+ *
+ * This is an omap iommu private data object, which binds an iommu user
+ * to its iommu device. This object should be placed at the iommu user's
+ * dev_archdata so generic IOMMU API can be used without having to
+ * utilize omap-specific plumbing anymore.
+ */
+struct omap_iommu_arch_data {
+ const char *name;
+ struct omap_iommu *iommu_dev;
+};
+
+/**
+ * dev_to_omap_iommu() - retrieves an omap iommu object from a user device
+ * @dev: iommu client device
+ */
+static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
+{
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+
+ return arch_data->iommu_dev;
+}
+
/* IOMMU errors */
#define OMAP_IOMMU_ERR_TLB_MISS (1 << 0)
#define OMAP_IOMMU_ERR_TRANS_FAULT (1 << 1)
--
1.7.4.1


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