iommu/mediatek: Add iova_region structure

Add a new structure for the iova_region. Each a region will be a
independent iommu domain.

For the previous SoC, there is single iova region(0~4G). For the SoC
that need support multi-domains, there will be several regions.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-27-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index a9b79e118f02..118170af1974 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -45,10 +45,15 @@ enum mtk_iommu_plat {
 	M4U_MT8183,
 };
 
+struct mtk_iommu_iova_region;
+
 struct mtk_iommu_plat_data {
 	enum mtk_iommu_plat m4u_plat;
 	u32                 flags;
 	u32                 inv_sel_reg;
+
+	unsigned int				iova_region_nr;
+	const struct mtk_iommu_iova_region	*iova_region;
 	unsigned char       larbid_remap[MTK_LARB_COM_MAX][MTK_LARB_SUBCOM_MAX];
 };