To allow other devices know the SMMU HW IIDR, record the IIDR contents as the first member of the arm_smmu_device structure.
In storing as the first member, it saves exposing SMMU APIs, which are nicely self-contained today. Signed-off-by: John Garry <[email protected]> --- drivers/iommu/arm-smmu-v3.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 40f4757096c3..1ed3ef0f1ec3 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -70,6 +70,8 @@ #define IDR1_SSIDSIZE GENMASK(10, 6) #define IDR1_SIDSIZE GENMASK(5, 0) +#define ARM_SMMU_IIDR 0x18 + #define ARM_SMMU_IDR5 0x14 #define IDR5_STALL_MAX GENMASK(31, 16) #define IDR5_GRAN64K (1 << 6) @@ -546,6 +548,7 @@ struct arm_smmu_strtab_cfg { /* An SMMUv3 instance */ struct arm_smmu_device { + u32 iidr; /* must be first member */ struct device *dev; void __iomem *base; @@ -3153,6 +3156,8 @@ static int arm_smmu_device_probe(struct platform_device *pdev) iommu_device_set_ops(&smmu->iommu, &arm_smmu_ops); iommu_device_set_fwnode(&smmu->iommu, dev->fwnode); + smmu->iidr = readl(smmu->base + ARM_SMMU_IIDR); + ret = iommu_device_register(&smmu->iommu); if (ret) { dev_err(dev, "Failed to register iommu\n"); -- 2.17.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
