1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2019, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/of_device.h>
7 #include <linux/qcom_scm.h>
8
9 #include "arm-smmu.h"
10
11 struct qcom_smmu {
12 struct arm_smmu_device smmu;
13 };
14
15 static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
16 { .compatible = "qcom,adreno" },
17 { .compatible = "qcom,mdp4" },
18 { .compatible = "qcom,mdss" },
19 { .compatible = "qcom,sc7180-mdss" },
20 { .compatible = "qcom,sc7180-mss-pil" },
21 { .compatible = "qcom,sdm845-mdss" },
22 { .compatible = "qcom,sdm845-mss-pil" },
23 { }
24 };
25
qcom_smmu_def_domain_type(struct device * dev)26 static int qcom_smmu_def_domain_type(struct device *dev)
27 {
28 const struct of_device_id *match =
29 of_match_device(qcom_smmu_client_of_match, dev);
30
31 return match ? IOMMU_DOMAIN_IDENTITY : 0;
32 }
33
qcom_sdm845_smmu500_reset(struct arm_smmu_device * smmu)34 static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu)
35 {
36 int ret;
37
38 /*
39 * To address performance degradation in non-real time clients,
40 * such as USB and UFS, turn off wait-for-safe on sdm845 based boards,
41 * such as MTP and db845, whose firmwares implement secure monitor
42 * call handlers to turn on/off the wait-for-safe logic.
43 */
44 ret = qcom_scm_qsmmu500_wait_safe_toggle(0);
45 if (ret)
46 dev_warn(smmu->dev, "Failed to turn off SAFE logic\n");
47
48 return ret;
49 }
50
qcom_smmu500_reset(struct arm_smmu_device * smmu)51 static int qcom_smmu500_reset(struct arm_smmu_device *smmu)
52 {
53 const struct device_node *np = smmu->dev->of_node;
54
55 arm_mmu500_reset(smmu);
56
57 if (of_device_is_compatible(np, "qcom,sdm845-smmu-500"))
58 return qcom_sdm845_smmu500_reset(smmu);
59
60 return 0;
61 }
62
63 static const struct arm_smmu_impl qcom_smmu_impl = {
64 .def_domain_type = qcom_smmu_def_domain_type,
65 .reset = qcom_smmu500_reset,
66 };
67
qcom_smmu_impl_init(struct arm_smmu_device * smmu)68 struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu)
69 {
70 struct qcom_smmu *qsmmu;
71
72 /* Check to make sure qcom_scm has finished probing */
73 if (!qcom_scm_is_available())
74 return ERR_PTR(-EPROBE_DEFER);
75
76 qsmmu = devm_kzalloc(smmu->dev, sizeof(*qsmmu), GFP_KERNEL);
77 if (!qsmmu)
78 return ERR_PTR(-ENOMEM);
79
80 qsmmu->smmu = *smmu;
81
82 qsmmu->smmu.impl = &qcom_smmu_impl;
83 devm_kfree(smmu->dev, smmu);
84
85 return &qsmmu->smmu;
86 }
87