iommu/exynos: Add callback for initializing devices from device tree
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@samsung.com>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 0fb40ee9..97c41b8 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1146,6 +1146,33 @@
iommu_group_remove_device(dev);
}
+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 -ENODEV;
+
+ data = platform_get_drvdata(sysmmu);
+ if (!data)
+ return -ENODEV;
+
+ if (!owner) {
+ owner = kzalloc(sizeof(*owner), GFP_KERNEL);
+ if (!owner)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&owner->controllers);
+ dev->archdata.iommu = owner;
+ }
+
+ list_add_tail(&data->owner_node, &owner->controllers);
+ return 0;
+}
+
static struct iommu_ops exynos_iommu_ops = {
.domain_alloc = exynos_iommu_domain_alloc,
.domain_free = exynos_iommu_domain_free,
@@ -1158,6 +1185,7 @@
.add_device = exynos_iommu_add_device,
.remove_device = exynos_iommu_remove_device,
.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
+ .of_xlate = exynos_iommu_of_xlate,
};
static bool init_done;
