iommu/qcom: Add qcom_iommu (0ae349a0) · Commits · 戴 / test

An iommu driver for Qualcomm "B" family devices which do implement the ARM SMMU spec, but not in a way that is compatible with how the arm-smmu driver is designed. It seems SMMU_SCR1.GASRAE=1 so the global register space is not accessible. This means it needs to get configuration from devicetree instead of setting it up dynamically. In the end, other than register definitions, there is not much code to share with arm-smmu (other than what has already been refactored out into the pgtable helpers). Signed-off-by:

Rob Clark <robdclark@gmail.com> Tested-by:

Riku Voipio <riku.voipio@linaro.org> Signed-off-by:

Joerg Roedel <jroedel@suse.de>

drivers/iommu/Kconfig

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Original line number	Diff line number	Diff line
		@@ -367,4 +367,14 @@ config MTK_IOMMU_V1

		if unsure, say N here.

		config QCOM_IOMMU
		# Note: iommu drivers cannot (yet?) be built as modules
		bool "Qualcomm IOMMU Support"
		depends on ARCH_QCOM \|\| COMPILE_TEST
		select IOMMU_API
		select IOMMU_IO_PGTABLE_LPAE
		select ARM_DMA_USE_IOMMU
		help
		Support for IOMMU on certain Qualcomm SoCs.

		endif # IOMMU_SUPPORT

drivers/iommu/Makefile

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Original line number	Diff line number	Diff line
		@@ -27,3 +27,4 @@ obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
		obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
		obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o
		obj-$(CONFIG_S390_IOMMU) += s390-iommu.o
		obj-$(CONFIG_QCOM_IOMMU) += qcom_iommu.o

drivers/iommu/qcom_iommu.c

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File added.

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