| Message ID | 20180727070224.23966-5-vivek.gautam@codeaurora.org (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | iommu/arm-smmu: Add runtime pm/sleep support | expand |
On 27/07/18 08:02, Vivek Gautam wrote: > 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@codeaurora.org> > Reviewed-by: Rob Herring <robh@kernel.org> > Reviewed-by: Tomasz Figa <tfiga@chromium.org> > --- > > Change since v13: > - No change. > > .../devicetree/bindings/iommu/arm,smmu.txt | 42 ++++++++++++++++++++++ > drivers/iommu/arm-smmu.c | 13 +++++++ > 2 files changed, 55 insertions(+) > > diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt > index 8a6ffce12af5..7c71a6ed465a 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. As demonstrated in the GPU thread, this proves a bit too vague for a useful binding. Provided Qcom folks can reach a consensus on what a given SoC is actually called, I'd rather just unambiguously list whatever sets of fully-defined strings we need. Robin. > + 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 +80,22 @@ conditions. > or using stream matching with #iommu-cells = <2>, and > may be ignored if present in such cases. > > +- clock-names: List of the names of clocks input to the device. The > + required list depends on particular implementation and > + is as follows: > + - for "qcom,smmu-v2": > + - "bus": clock required for downstream bus access and > + for the smmu ptw, > + - "iface": clock required to access smmu's registers > + through the TCU's programming interface. > + - unspecified for other implementations. > + > +- clocks: Specifiers for all clocks listed in the clock-names property, > + as per generic clock bindings. > + > +- power-domains: Specifiers for power domains required to be powered on for > + the SMMU to operate, as per generic power domain bindings. > + > ** Deprecated properties: > > - mmu-masters (deprecated in favour of the generic "iommus" binding) : > @@ -137,3 +162,20 @@ 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 e558abf1ecfc..2b4edba188a5 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 { > @@ -1971,6 +1972,17 @@ ARM_SMMU_MATCH_DATA(arm_mmu401, ARM_SMMU_V1_64K, GENERIC_SMMU); > 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 }, > @@ -1978,6 +1990,7 @@ static const struct of_device_id arm_smmu_of_match[] = { > { .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); >
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt index 8a6ffce12af5..7c71a6ed465a 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 +80,22 @@ conditions. or using stream matching with #iommu-cells = <2>, and may be ignored if present in such cases. +- clock-names: List of the names of clocks input to the device. The + required list depends on particular implementation and + is as follows: + - for "qcom,smmu-v2": + - "bus": clock required for downstream bus access and + for the smmu ptw, + - "iface": clock required to access smmu's registers + through the TCU's programming interface. + - unspecified for other implementations. + +- clocks: Specifiers for all clocks listed in the clock-names property, + as per generic clock bindings. + +- power-domains: Specifiers for power domains required to be powered on for + the SMMU to operate, as per generic power domain bindings. + ** Deprecated properties: - mmu-masters (deprecated in favour of the generic "iommus" binding) : @@ -137,3 +162,20 @@ 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 e558abf1ecfc..2b4edba188a5 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 { @@ -1971,6 +1972,17 @@ ARM_SMMU_MATCH_DATA(arm_mmu401, ARM_SMMU_V1_64K, GENERIC_SMMU); 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 }, @@ -1978,6 +1990,7 @@ static const struct of_device_id arm_smmu_of_match[] = { { .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);