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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>
This commit is contained in:
Marek Szyprowski 2015-05-19 15:20:37 +02:00 committed by Joerg Roedel
parent 8ed55c812f
commit aa759fd376
1 changed files with 28 additions and 0 deletions
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28
drivers/iommu/exynos-iommu.c
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@ -1146,6 +1146,33 @@ static void exynos_iommu_remove_device(struct device *dev)
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 @@ static struct iommu_ops exynos_iommu_ops = {
.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;