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Message-Id: <1518173826-11759-1-git-send-email-vivek.gautam@codeaurora.org>
Date: Fri, 9 Feb 2018 16:27:06 +0530
From: Vivek Gautam <vivek.gautam@...eaurora.org>
To: joro@...tes.org, robh+dt@...nel.org, mark.rutland@....com,
rjw@...ysocki.net, robin.murphy@....com, will.deacon@....com,
robdclark@...il.com, iommu@...ts.linux-foundation.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org
Cc: alex.williamson@...hat.com, gregkh@...uxfoundation.org,
sboyd@...eaurora.org, sricharan@...eaurora.org,
m.szyprowski@...sung.com, architt@...eaurora.org, airlied@...ux.ie,
linux-arm-msm@...r.kernel.org, vivek.gautam@...eaurora.org
Subject: [PATCH v8 5/6] iommu/arm-smmu: Add support for qcom,smmu-v2 variant
qcom,smmu-v2 is an arm,smmu-v2 implementation with specific
clock and power requirements. This smmu core is used with
multiple masters on msm8996, viz. mdss, video, etc.
Add bindings for the same.
Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
Reviewed-by: Rob Herring <robh@...nel.org>
---
Changes in v8:
- Added the missing IOMMU_OF_DECLARE declaration for "qcom,smmu-v2"
.../devicetree/bindings/iommu/arm,smmu.txt | 43 ++++++++++++++++++++++
drivers/iommu/arm-smmu.c | 14 +++++++
2 files changed, 57 insertions(+)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
index 8a6ffce12af5..169222ae2706 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
@@ -17,10 +17,19 @@ conditions.
"arm,mmu-401"
"arm,mmu-500"
"cavium,smmu-v2"
+ "qcom,<soc>-smmu-v2", "qcom,smmu-v2"
depending on the particular implementation and/or the
version of the architecture implemented.
+ A number of Qcom SoCs use qcom,smmu-v2 version of the IP.
+ "qcom,<soc>-smmu-v2" represents a soc specific compatible
+ string that should be present along with the "qcom,smmu-v2"
+ to facilitate SoC specific clocks/power connections and to
+ address specific bug fixes.
+ An example string would be -
+ "qcom,msm8996-smmu-v2", "qcom,smmu-v2".
+
- reg : Base address and size of the SMMU.
- #global-interrupts : The number of global interrupts exposed by the
@@ -71,6 +80,23 @@ conditions.
or using stream matching with #iommu-cells = <2>, and
may be ignored if present in such cases.
+- clock-names: Should be "bus", and "iface" for "qcom,smmu-v2"
+ implementation.
+
+ "bus" clock for "qcom,smmu-v2" is required for downstream
+ bus access and for the smmu ptw.
+
+ "iface" clock is required to access smmu's registers through
+ the TCU's programming interface.
+
+- clocks: Phandles for respective clocks described by clock-names.
+
+- power-domains: Phandles to SMMU's power domain specifier. This is
+ required even if SMMU belongs to the master's power
+ domain, as the SMMU will have to be enabled and
+ accessed before master gets enabled and linked to its
+ SMMU.
+
** Deprecated properties:
- mmu-masters (deprecated in favour of the generic "iommus" binding) :
@@ -137,3 +163,20 @@ conditions.
iommu-map = <0 &smmu3 0 0x400>;
...
};
+
+ /* Qcom's arm,smmu-v2 implementation */
+ smmu4: iommu {
+ compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
+ reg = <0xd00000 0x10000>;
+
+ #global-interrupts = <1>;
+ interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>;
+ #iommu-cells = <1>;
+ power-domains = <&mmcc MDSS_GDSC>;
+
+ clocks = <&mmcc SMMU_MDP_AXI_CLK>,
+ <&mmcc SMMU_MDP_AHB_CLK>;
+ clock-names = "bus", "iface";
+ };
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index c7e924d553bd..40da3f251acf 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -119,6 +119,7 @@ enum arm_smmu_implementation {
GENERIC_SMMU,
ARM_MMU500,
CAVIUM_SMMUV2,
+ QCOM_SMMUV2,
};
struct arm_smmu_s2cr {
@@ -1950,6 +1951,17 @@ struct arm_smmu_match_data {
ARM_SMMU_MATCH_DATA(arm_mmu500, ARM_SMMU_V2, ARM_MMU500);
ARM_SMMU_MATCH_DATA(cavium_smmuv2, ARM_SMMU_V2, CAVIUM_SMMUV2);
+static const char * const qcom_smmuv2_clks[] = {
+ "bus", "iface",
+};
+
+static const struct arm_smmu_match_data qcom_smmuv2 = {
+ .version = ARM_SMMU_V2,
+ .model = QCOM_SMMUV2,
+ .clks = qcom_smmuv2_clks,
+ .num_clks = ARRAY_SIZE(qcom_smmuv2_clks),
+};
+
static const struct of_device_id arm_smmu_of_match[] = {
{ .compatible = "arm,smmu-v1", .data = &smmu_generic_v1 },
{ .compatible = "arm,smmu-v2", .data = &smmu_generic_v2 },
@@ -1957,6 +1969,7 @@ struct arm_smmu_match_data {
{ .compatible = "arm,mmu-401", .data = &arm_mmu401 },
{ .compatible = "arm,mmu-500", .data = &arm_mmu500 },
{ .compatible = "cavium,smmu-v2", .data = &cavium_smmuv2 },
+ { .compatible = "qcom,smmu-v2", .data = &qcom_smmuv2 },
{ },
};
MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
@@ -2319,6 +2332,7 @@ static int __maybe_unused arm_smmu_runtime_suspend(struct device *dev)
IOMMU_OF_DECLARE(arm_mmu401, "arm,mmu-401");
IOMMU_OF_DECLARE(arm_mmu500, "arm,mmu-500");
IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2");
+IOMMU_OF_DECLARE(qcom_smmuv2, "qcom,smmu-v2");
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
MODULE_AUTHOR("Will Deacon <will.deacon@....com>");
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
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