* Hiroshi Doyu wrote: > From: Hiroshi DOYU <[email protected]> > > Add device tree support for Tegra30 IOMMU(SMMU). > > Signed-off-by: Hiroshi DOYU <[email protected]> > --- > .../devicetree/bindings/arm/tegra/tegra30-smmu.txt | 19 +++++++++++++++++++ > arch/arm/boot/dts/tegra30.dtsi | 10 ++++++++++ > 2 files changed, 29 insertions(+), 0 deletions(-) > > diff --git a/Documentation/devicetree/bindings/arm/tegra/tegra30-smmu.txt > b/Documentation/devicetree/bindings/arm/tegra/tegra30-smmu.txt > new file mode 100644 > index 0000000..4bd8cd0 > --- /dev/null > +++ b/Documentation/devicetree/bindings/arm/tegra/tegra30-smmu.txt > @@ -0,0 +1,19 @@ > +NVIDIA Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit) > + > +Required properties: > +- compatible : "nvidia,tegra30-smmu" > +- reg : Should contain MC registers location and length > +- reg : Should contain AHB Arbitration registers and length > +- reg : Should contain virtual address space range > +- interrupts : Should contain MC General interrupt > + > +Example: > + smmu: smmu@7000f000 { > + compatible = "nvidia,tegra30-smmu"; > + reg = < 0x7000f000 0x400 /* controller registers */ > + 0x6000c000 0x150 /* AHB Arbitration registers */ > + 0x00001000 0x3ffff000 >;/* Virtual address space range > + * Exclude the 1st & last page > + */ > + interrupts = < 0 13 0x40 >; > + }; > diff --git a/arch/arm/boot/dts/tegra30.dtsi b/arch/arm/boot/dts/tegra30.dtsi > index 62a7b39..c640a5b 100644 > --- a/arch/arm/boot/dts/tegra30.dtsi > +++ b/arch/arm/boot/dts/tegra30.dtsi > @@ -183,4 +183,14 @@ > reg = < 0x70000868 0xd0 /* Pad control registers */ > 0x70003000 0x3e0 >; /* Mux registers */ > }; > + > + smmu: smmu@7000f000 { > + compatible = "nvidia,tegra30-smmu"; > + reg = < 0x7000f000 0x400 /* controller registers */ > + 0x6000c000 0x150 /* AHB Arbitration registers */ > + 0x00001000 0x3ffff000 >;/* Virtual address space range > + * Exclude the 1st & last page > + */ > + interrupts = < 0 13 0x40 >; > + }; > };
Why is the virtual address space range limited to 1 GiB? What is the reason for the exclusion of the first and last pages? Thierry
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