Commit 67b65a3f authored by Robin Murphy's avatar Robin Murphy Committed by Will Deacon
Browse files

iommu/arm-smmu: Differentiate specific implementations 



As the inevitable reality of implementation-specific errata workarounds
begin to accrue alongside our integration quirk handling, it's about
time the driver had a decent way of keeping track. Extend the per-SMMU
data so we can identify specific implementations in an efficient and
firmware-agnostic manner.

Acked-by: default avatarTirumalesh Chalamarla <tchalamarla@caviumnetworks.com>
Signed-off-by: default avatarRobin Murphy <robin.murphy@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 1bd37a68

drivers/iommu/arm-smmu.c

+26 −7
Original line number Diff line number Diff line
@@ -278,6 +278,10 @@ enum arm_smmu_arch_version { 
	ARM_SMMU_V2,

};



enum arm_smmu_implementation {

	GENERIC_SMMU,

};



struct arm_smmu_smr {

	u8				idx;

	u16				mask;
@@ -315,6 +319,7 @@ struct arm_smmu_device { 
#define ARM_SMMU_OPT_SECURE_CFG_ACCESS (1 << 0)

	u32				options;

	enum arm_smmu_arch_version	version;

	enum arm_smmu_implementation	model;



	u32				num_context_banks;

	u32				num_s2_context_banks;
@@ -1735,13 +1740,24 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu) 
	return 0;

}



struct arm_smmu_match_data {

	enum arm_smmu_arch_version version;

	enum arm_smmu_implementation model;

};



#define ARM_SMMU_MATCH_DATA(name, ver, imp)	\

static struct arm_smmu_match_data name = { .version = ver, .model = imp }



ARM_SMMU_MATCH_DATA(smmu_generic_v1, ARM_SMMU_V1, GENERIC_SMMU);

ARM_SMMU_MATCH_DATA(smmu_generic_v2, ARM_SMMU_V2, GENERIC_SMMU);



static const struct of_device_id arm_smmu_of_match[] = {

	{ .compatible = "arm,smmu-v1", .data = (void *)ARM_SMMU_V1 },

	{ .compatible = "arm,smmu-v2", .data = (void *)ARM_SMMU_V2 },

	{ .compatible = "arm,mmu-400", .data = (void *)ARM_SMMU_V1 },

	{ .compatible = "arm,mmu-401", .data = (void *)ARM_SMMU_V1 },

	{ .compatible = "arm,mmu-500", .data = (void *)ARM_SMMU_V2 },

	{ .compatible = "cavium,smmu-v2", .data = (void *)ARM_SMMU_V2 },

	{ .compatible = "arm,smmu-v1", .data = &smmu_generic_v1 },

	{ .compatible = "arm,smmu-v2", .data = &smmu_generic_v2 },

	{ .compatible = "arm,mmu-400", .data = &smmu_generic_v1 },

	{ .compatible = "arm,mmu-401", .data = &smmu_generic_v1 },

	{ .compatible = "arm,mmu-500", .data = &smmu_generic_v2 },

	{ .compatible = "cavium,smmu-v2", .data = &smmu_generic_v2 },

	{ },

};

MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
@@ -1749,6 +1765,7 @@ MODULE_DEVICE_TABLE(of, arm_smmu_of_match); 
static int arm_smmu_device_dt_probe(struct platform_device *pdev)

{

	const struct of_device_id *of_id;

	const struct arm_smmu_match_data *data;

	struct resource *res;

	struct arm_smmu_device *smmu;

	struct device *dev = &pdev->dev;
@@ -1764,7 +1781,9 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev) 
	smmu->dev = dev;



	of_id = of_match_node(arm_smmu_of_match, dev->of_node);

	smmu->version = (enum arm_smmu_arch_version)of_id->data;

	data = of_id->data;

	smmu->version = data->version;

	smmu->model = data->model;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	smmu->base = devm_ioremap_resource(dev, res);

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