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Commit a0fddb68 authored by Patrick Daly's avatar Patrick Daly
Browse files

iommu: arm-smmu: Read TCU hardware version 



Read the hw version from a register so that any workarounds for a
particular revision can be applied.

Change-Id: Ie4a43a21da40d239a9e51f21e4615ba4b89a7d99
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent 6b290f1e

Documentation/devicetree/bindings/iommu/arm,smmu.txt

+2 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ conditions. 


- reg           : Base address and size of the SMMU.



- reg-names	: For the "qcom,qsmmu-v500" device "tcu-base" is expected.



- #global-interrupts : The number of global interrupts exposed by the

                       device.

arch/arm64/boot/dts/qcom/msm-arm-smmu-sdm845.dtsi

+3 −1
Original line number Diff line number Diff line
@@ -49,7 +49,9 @@ 


	apps_smmu: apps-smmu@0x15000000 {

		compatible = "qcom,qsmmu-v500";

		reg = <0x15000000 0x80000>;

		reg = <0x15000000 0x80000>,

			<0x150c2000 0x20>;

		reg-names = "base", "tcu-base";

		#iommu-cells = <1>;

		qcom,skip-init;

		#global-interrupts = <1>;

drivers/iommu/arm-smmu.c

+14 −0
Original line number Diff line number Diff line
@@ -3946,6 +3946,8 @@ IOMMU_OF_DECLARE(arm_mmu401, "arm,mmu-401", arm_smmu_of_init); 
IOMMU_OF_DECLARE(arm_mmu500, "arm,mmu-500", arm_smmu_of_init);

IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2", arm_smmu_of_init);



#define TCU_HW_VERSION_HLOS1		(0x18)



#define DEBUG_SID_HALT_REG		0x0

#define DEBUG_SID_HALT_VAL		(0x1 << 16)
@@ -3956,6 +3958,8 @@ IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2", arm_smmu_of_init); 


struct qsmmuv500_archdata {

	struct list_head		tbus;

	void __iomem			*tcu_base;

	u32				version;

};



struct qsmmuv500_tbu_device {
@@ -4130,8 +4134,10 @@ static int qsmmuv500_tbu_register(struct device *dev, void *data) 


static int qsmmuv500_arch_init(struct arm_smmu_device *smmu)

{

	struct resource *res;

	struct device *dev = smmu->dev;

	struct qsmmuv500_archdata *data;

	struct platform_device *pdev;

	int ret;



	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
@@ -4139,6 +4145,14 @@ static int qsmmuv500_arch_init(struct arm_smmu_device *smmu) 
		return -ENOMEM;



	INIT_LIST_HEAD(&data->tbus);



	pdev = container_of(dev, struct platform_device, dev);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tcu-base");

	data->tcu_base = devm_ioremap_resource(dev, res);

	if (IS_ERR(data->tcu_base))

		return PTR_ERR(data->tcu_base);



	data->version = readl_relaxed(data->tcu_base + TCU_HW_VERSION_HLOS1);

	smmu->archdata = data;



	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);