iommu: Add Allwinner H6 IOMMU driver

The Allwinner H6 has introduced an IOMMU for a few DMA controllers, mostly video related: the display engine, the video decoders / encoders, the camera capture controller, etc. The design is pretty simple compared to other IOMMUs found in SoCs: there's a single instance, controlling all the masters, with a single address space. It also features a performance monitoring unit that allows to retrieve various informations (per-master and global TLB accesses, hits and misses, access latency, etc) that isn't supported at the moment. Signed-off-by: Maxime Ripard <[email protected]> Link: https://lore.kernel.org/r/d122a8670361e36fc26b4ce2674a2223d30dc4cc.1589378833.git-series.maxime@cerno.tech Signed-off-by: Joerg Roedel <[email protected]>
torvalds · May 14, 2020 · 4100b8c · 4100b8c
1 parent db7d3cb
commit 4100b8c
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diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
@@ -303,6 +303,15 @@ config ROCKCHIP_IOMMU
 	  Say Y here if you are using a Rockchip SoC that includes an IOMMU
 	  device.
 
+config SUN50I_IOMMU
+	bool "Allwinner H6 IOMMU Support"
+	depends on ARCH_SUNXI || COMPILE_TEST
+	select ARM_DMA_USE_IOMMU
+	select IOMMU_API
+	select IOMMU_DMA
+	help
+	  Support for the IOMMU introduced in the Allwinner H6 SoCs.
+
 config TEGRA_IOMMU_GART
 	bool "Tegra GART IOMMU Support"
 	depends on ARCH_TEGRA_2x_SOC

diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_MTK_IOMMU_V1) += mtk_iommu_v1.o
 obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o
 obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
 obj-$(CONFIG_ROCKCHIP_IOMMU) += rockchip-iommu.o
+obj-$(CONFIG_SUN50I_IOMMU) += sun50i-iommu.o
 obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
 obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
 obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o