This patch adds implementation of of_xlate callback, which prepares
masters device for attaching to IOMMU. This callback is called during
creating devices from device tree.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/iommu/exynos-iommu.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 0d304c62956e..6b8fe57d17f2 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1077,6 +1077,33 @@ static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain,
return phys;
}
+static int exynos_iommu_of_xlate(struct device *dev,
+ struct of_phandle_args *spec)
+{
+ struct exynos_iommu_owner *owner = dev->archdata.iommu;
+ struct platform_device *sysmmu = of_find_device_by_node(spec->np);
+ struct sysmmu_drvdata *data;
+
+ if (!sysmmu)
+ return 0;
+
+ data = platform_get_drvdata(sysmmu);
+ if (!data)
+ return 0;
+
+ if (!owner) {
+ owner = kzalloc(sizeof(*owner), GFP_KERNEL);
+ if (!owner)
+ return 0;
+
+ INIT_LIST_HEAD(&owner->clients);
+ dev->archdata.iommu = owner;
+ }
+
+ list_add_tail(&data->owner_node, &owner->clients);
+ return 1;
+}
+
static const struct iommu_ops exynos_iommu_ops = {
.domain_init = exynos_iommu_domain_init,
.domain_destroy = exynos_iommu_domain_destroy,
@@ -1086,6 +1113,7 @@ static const struct iommu_ops exynos_iommu_ops = {
.unmap = exynos_iommu_unmap,
.iova_to_phys = exynos_iommu_iova_to_phys,
.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
+ .of_xlate = exynos_iommu_of_xlate,
};
static int init_done;
--
1.9.2
--
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