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iommu/arm-smmu: Allow client devices to select direct mapping

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Some client devices want to directly map the IOMMU themselves instead
of using the DMA domain. Allow those devices to opt in to direct
mapping by way of a list of compatible strings.

Co-developed-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/7cf1f64167b5545b7f42275395be1f1e2ea3a6ac.1587407458.git.saiprakash.ranjan@codeaurora.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jordan Crouse 2020-04-21 00:03:51 +05:30 committed by Will Deacon
parent 232c5ae8a3
commit 0e764a0101
1 changed files with 19 additions and 0 deletions
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19
drivers/iommu/arm-smmu-qcom.c
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@ -3,6 +3,7 @@
* Copyright (c) 2019, The Linux Foundation. All rights reserved.
*/
#include <linux/of_device.h>
#include <linux/qcom_scm.h>
#include "arm-smmu.h"
@ -11,6 +12,23 @@ struct qcom_smmu {
struct arm_smmu_device smmu;
};
static const struct of_device_id qcom_smmu_client_of_match[] = {
{ .compatible = "qcom,adreno" },
{ .compatible = "qcom,mdp4" },
{ .compatible = "qcom,mdss" },
{ .compatible = "qcom,sc7180-mdss" },
{ .compatible = "qcom,sdm845-mdss" },
{ }
};
static int qcom_smmu_def_domain_type(struct device *dev)
{
const struct of_device_id *match =
of_match_device(qcom_smmu_client_of_match, dev);
return match ? IOMMU_DOMAIN_IDENTITY : 0;
}
static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu)
{
int ret;
@ -41,6 +59,7 @@ static int qcom_smmu500_reset(struct arm_smmu_device *smmu)
}
static const struct arm_smmu_impl qcom_smmu_impl = {
.def_domain_type = qcom_smmu_def_domain_type,
.reset = qcom_smmu500_reset,
};