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author | Arnd Bergmann <arnd@arndb.de> | 2012-09-04 15:01:37 +0200 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2012-09-04 15:01:37 +0200 |
commit | 863e99a8c1ea2b0391491904297f57a0f6a1fdd6 (patch) | |
tree | 0e7789f83c0ba3a1bc3c19d3ccf5ea6f84f19db6 /Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt | |
parent | dd9bf78040fa0da4cecc228e1682b9682b8cb180 (diff) | |
parent | a849088aa1552b1a28eea3daff599ee22a734ae3 (diff) |
Merge commit 'a849088aa1' from rmk/fixes into cleanup/io-pci
As Stephen Rothwell reports, a849088aa155 ("ARM: Fix ioremap() of
address zero") from the arm-current tree and commit c2794437091a ("ARM:
Add fixed PCI i/o mapping") from the arm-soc tree conflict in
a nontrivial way in arch/arm/mm/mmu.c.
Rob Herring explains:
The PCI i/o reserved area has a dummy physical address of 0 and
needs to be skipped by ioremap searches. So we don't set
VM_ARM_STATIC_MAPPING to prevent matches by ioremap. The vm_struct
settings don't really matter when we do the real mapping of the
i/o space.
Since commit a849088aa155 is at the start of the fixes branch
in the arm tree, we can merge it into the branch that contains
the other ioremap changes.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt')
-rw-r--r-- | Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt new file mode 100644 index 00000000000..89fb5434b73 --- /dev/null +++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt @@ -0,0 +1,21 @@ +NVIDIA Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit) + +Required properties: +- compatible : "nvidia,tegra30-smmu" +- reg : Should contain 3 register banks(address and length) for each + of the SMMU register blocks. +- interrupts : Should contain MC General interrupt. +- nvidia,#asids : # of ASIDs +- dma-window : IOVA start address and length. +- nvidia,ahb : phandle to the ahb bus connected to SMMU. + +Example: + smmu { + compatible = "nvidia,tegra30-smmu"; + reg = <0x7000f010 0x02c + 0x7000f1f0 0x010 + 0x7000f228 0x05c>; + nvidia,#asids = <4>; /* # of ASIDs */ + dma-window = <0 0x40000000>; /* IOVA start & length */ + nvidia,ahb = <&ahb>; + }; |