diff options
Diffstat (limited to 'drivers/iommu/arm-smmu-impl.c')
| -rw-r--r-- | drivers/iommu/arm-smmu-impl.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c index efeb6d78da17..0657c85580cb 100644 --- a/drivers/iommu/arm-smmu-impl.c +++ b/drivers/iommu/arm-smmu-impl.c @@ -4,10 +4,54 @@ #define pr_fmt(fmt) "arm-smmu: " fmt +#include <linux/of.h> + #include "arm-smmu.h" +static int arm_smmu_gr0_ns(int offset) +{ + switch(offset) { + case ARM_SMMU_GR0_sCR0: + case ARM_SMMU_GR0_sACR: + case ARM_SMMU_GR0_sGFSR: + case ARM_SMMU_GR0_sGFSYNR0: + case ARM_SMMU_GR0_sGFSYNR1: + case ARM_SMMU_GR0_sGFSYNR2: + return offset + 0x400; + default: + return offset; + } +} + +static u32 arm_smmu_read_ns(struct arm_smmu_device *smmu, int page, + int offset) +{ + if (page == ARM_SMMU_GR0) + offset = arm_smmu_gr0_ns(offset); + return readl_relaxed(arm_smmu_page(smmu, page) + offset); +} + +static void arm_smmu_write_ns(struct arm_smmu_device *smmu, int page, + int offset, u32 val) +{ + if (page == ARM_SMMU_GR0) + offset = arm_smmu_gr0_ns(offset); + writel_relaxed(val, arm_smmu_page(smmu, page) + offset); +} + +/* Since we don't care for sGFAR, we can do without 64-bit accessors */ +const struct arm_smmu_impl calxeda_impl = { + .read_reg = arm_smmu_read_ns, + .write_reg = arm_smmu_write_ns, +}; + + struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu) { + if (of_property_read_bool(smmu->dev->of_node, + "calxeda,smmu-secure-config-access")) + smmu->impl = &calxeda_impl; + return smmu; } |