iommu: arm-smmu-impl: Convert to a generic reset implementation

Currently the QCOM specific smmu reset implementation is very
specific to SDM845 SoC and has a wait-for-safe logic which
may not be required for other SoCs. So move the SDM845 specific
logic to its specific reset function. Also add SC7180 SMMU
compatible for calling into QCOM specific implementation.

Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/d24a0278021bc0b2732636c5728efe55e7318a8b.1587407458.git.saiprakash.ranjan@codeaurora.org
Signed-off-by: Will Deacon <will@kernel.org>

drivers/iommu/arm-smmu-impl.c

@@ -150,6 +150,8 @@ static const struct arm_smmu_impl arm_mmu500_impl = {
 
 struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
 {
+	const struct device_node *np = smmu->dev->of_node;
+
 	/*
 	 * We will inevitably have to combine model-specific implementation
 	 * quirks with platform-specific integration quirks, but everything
@@ -166,11 +168,11 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
 		break;
 	}
 
-	if (of_property_read_bool(smmu->dev->of_node,
-				  "calxeda,smmu-secure-config-access"))
+	if (of_property_read_bool(np, "calxeda,smmu-secure-config-access"))
 		smmu->impl = &calxeda_impl;
 
-	if (of_device_is_compatible(smmu->dev->of_node, "qcom,sdm845-smmu-500"))
+	if (of_device_is_compatible(np, "qcom,sdm845-smmu-500") ||
+	    of_device_is_compatible(np, "qcom,sc7180-smmu-500"))
 		return qcom_smmu_impl_init(smmu);
 
 	return smmu;

drivers/iommu/arm-smmu-qcom.c

@@ -15,8 +15,6 @@ static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu)
 {
 	int ret;
 
-	arm_mmu500_reset(smmu);
-
 	/*
 	 * To address performance degradation in non-real time clients,
 	 * such as USB and UFS, turn off wait-for-safe on sdm845 based boards,
@@ -30,8 +28,20 @@ static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu)
 	return ret;
 }
 
+static int qcom_smmu500_reset(struct arm_smmu_device *smmu)
+{
+	const struct device_node *np = smmu->dev->of_node;
+
+	arm_mmu500_reset(smmu);
+
+	if (of_device_is_compatible(np, "qcom,sdm845-smmu-500"))
+		return qcom_sdm845_smmu500_reset(smmu);
+
+	return 0;
+}
+
 static const struct arm_smmu_impl qcom_smmu_impl = {
-	.reset = qcom_sdm845_smmu500_reset,
+	.reset = qcom_smmu500_reset,
 };
 
 struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu)