iommu/arm-smmu-v3: Implement shutdown method

The shutdown method disables the SMMU to avoid corrupting a new kernel
started with kexec.
Signed-off-by: NNate Watterson <nwatters@codeaurora.org>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

drivers/iommu/arm-smmu-v3.c

@@ -2852,9 +2852,15 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
 
 	arm_smmu_device_disable(smmu);
+
 	return 0;
 }
 
+static void arm_smmu_device_shutdown(struct platform_device *pdev)
+{
+	arm_smmu_device_remove(pdev);
+}
+
 static const struct of_device_id arm_smmu_of_match[] = {
 	{ .compatible = "arm,smmu-v3", },
 	{ },
@@ -2868,6 +2874,7 @@ static struct platform_driver arm_smmu_driver = {
 	},
 	.probe	= arm_smmu_device_probe,
 	.remove	= arm_smmu_device_remove,
+	.shutdown = arm_smmu_device_shutdown,
 };
 module_platform_driver(arm_smmu_driver);
 

drivers/iommu/arm-smmu.c

@@ -2329,6 +2329,11 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void arm_smmu_device_shutdown(struct platform_device *pdev)
+{
+	arm_smmu_device_remove(pdev);
+}
+
 static struct platform_driver arm_smmu_driver = {
 	.driver	= {
 		.name		= "arm-smmu",
@@ -2336,6 +2341,7 @@ static struct platform_driver arm_smmu_driver = {
 	},
 	.probe	= arm_smmu_device_probe,
 	.remove	= arm_smmu_device_remove,
+	.shutdown = arm_smmu_device_shutdown,
 };
 module_platform_driver(arm_smmu_driver);