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authorLinu Cherian <linu.cherian@cavium.com>2017-06-22 15:05:37 +0300
committerWill Deacon <will.deacon@arm.com>2017-06-23 19:58:03 +0300
commite5b829de053d9994dfc8652ce558e90e3406c578 (patch)
tree6215ecb21bf1ebad7ff0e5a123369d1cb69d764d /Documentation/devicetree/bindings/iommu
parent403e8c7c5bcaff3291a2c7012fe80f707a854d10 (diff)
downloadlinux-e5b829de053d9994dfc8652ce558e90e3406c578.tar.xz
iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #74
Cavium ThunderX2 SMMU implementation doesn't support page 1 register space and PAGE0_REGS_ONLY option is enabled as an errata workaround. This option when turned on, replaces all page 1 offsets used for EVTQ_PROD/CONS, PRIQ_PROD/CONS register access with page 0 offsets. SMMU resource size checks are now based on SMMU option PAGE0_REGS_ONLY, since resource size can be either 64k/128k. For this, arm_smmu_device_dt_probe/acpi_probe has been moved before platform_get_resource call, so that SMMU options are set beforehand. Signed-off-by: Linu Cherian <linu.cherian@cavium.com> Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'Documentation/devicetree/bindings/iommu')
-rw-r--r--Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
index be57550e14e4..e7855cf6038e 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
@@ -49,6 +49,12 @@ the PCIe specification.
- hisilicon,broken-prefetch-cmd
: Avoid sending CMD_PREFETCH_* commands to the SMMU.
+- cavium,cn9900-broken-page1-regspace
+ : Replaces all page 1 offsets used for EVTQ_PROD/CONS,
+ PRIQ_PROD/CONS register access with page 0 offsets.
+ Set for Cavium ThunderX2 silicon that doesn't support
+ SMMU page1 register space.
+
** Example
smmu@2b400000 {