iommu: add Unisoc IOMMU basic driver

This IOMMU module can be used by Unisoc's multimedia devices, such as
display, Image codec(jpeg) and a few signal processors, including
VSP(video), GSP(graphic), ISP(image), and CPP(camera pixel processor), etc.

Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Link: https://lore.kernel.org/r/20210305093216.201897-3-zhang.lyra@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/Kconfig

@@ -408,4 +408,16 @@ config VIRTIO_IOMMU
 
 	  Say Y here if you intend to run this kernel as a guest.
 
+config SPRD_IOMMU
+	tristate "Unisoc IOMMU Support"
+	depends on ARCH_SPRD || COMPILE_TEST
+	select IOMMU_API
+	help
+	  Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by
+	  Unisoc's multimedia devices, such as display, Image codec(jpeg)
+	  and a few signal processors, including VSP(video), GSP(graphic),
+	  ISP(image), and CPP(camera pixel processor), etc.
+
+	  Say Y here if you want to use the multimedia devices listed above.
+
 endif # IOMMU_SUPPORT

drivers/iommu/Makefile

@@ -28,3 +28,4 @@ obj-$(CONFIG_S390_IOMMU) += s390-iommu.o
 obj-$(CONFIG_HYPERV_IOMMU) += hyperv-iommu.o
 obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu.o
 obj-$(CONFIG_IOMMU_SVA_LIB) += iommu-sva-lib.o
+obj-$(CONFIG_SPRD_IOMMU) += sprd-iommu.o