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| -rw-r--r-- | Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt | 173 |
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diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt new file mode 100644 index 000000000..3ea78c4ef --- /dev/null +++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt @@ -0,0 +1,173 @@ +* ARM Generic Interrupt Controller, version 3 + +AArch64 SMP cores are often associated with a GICv3, providing Private +Peripheral Interrupts (PPI), Shared Peripheral Interrupts (SPI), +Software Generated Interrupts (SGI), and Locality-specific Peripheral +Interrupts (LPI). + +Main node required properties: + +- compatible : should at least contain "arm,gic-v3". +- interrupt-controller : Identifies the node as an interrupt controller +- #interrupt-cells : Specifies the number of cells needed to encode an + interrupt source. Must be a single cell with a value of at least 3. + If the system requires describing PPI affinity, then the value must + be at least 4. + + The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI + interrupts. Other values are reserved for future use. + + The 2nd cell contains the interrupt number for the interrupt type. + SPI interrupts are in the range [0-987]. PPI interrupts are in the + range [0-15]. + + The 3rd cell is the flags, encoded as follows: + bits[3:0] trigger type and level flags. + 1 = edge triggered + 4 = level triggered + + The 4th cell is a phandle to a node describing a set of CPUs this + interrupt is affine to. The interrupt must be a PPI, and the node + pointed must be a subnode of the "ppi-partitions" subnode. For + interrupt types other than PPI or PPIs that are not partitionned, + this cell must be zero. See the "ppi-partitions" node description + below. + + Cells 5 and beyond are reserved for future use and must have a value + of 0 if present. + +- reg : Specifies base physical address(s) and size of the GIC + registers, in the following order: + - GIC Distributor interface (GICD) + - GIC Redistributors (GICR), one range per redistributor region + - GIC CPU interface (GICC) + - GIC Hypervisor interface (GICH) + - GIC Virtual CPU interface (GICV) + + GICC, GICH and GICV are optional. + +- interrupts : Interrupt source of the VGIC maintenance interrupt. + +Optional + +- redistributor-stride : If using padding pages, specifies the stride + of consecutive redistributors. Must be a multiple of 64kB. + +- #redistributor-regions: The number of independent contiguous regions + occupied by the redistributors. Required if more than one such + region is present. + +- msi-controller: Boolean property. Identifies the node as an MSI + controller. Only present if the Message Based Interrupt + functionnality is being exposed by the HW, and the mbi-ranges + property present. + +- mbi-ranges: A list of pairs <intid span>, where "intid" is the first + SPI of a range that can be used an MBI, and "span" the size of that + range. Multiple ranges can be provided. Requires "msi-controller" to + be set. + +- mbi-alias: Address property. Base address of an alias of the GICD + region containing only the {SET,CLR}SPI registers to be used if + isolation is required, and if supported by the HW. + +Sub-nodes: + +PPI affinity can be expressed as a single "ppi-partitions" node, +containing a set of sub-nodes, each with the following property: +- affinity: Should be a list of phandles to CPU nodes (as described in +Documentation/devicetree/bindings/arm/cpus.txt). + +GICv3 has one or more Interrupt Translation Services (ITS) that are +used to route Message Signalled Interrupts (MSI) to the CPUs. + +These nodes must have the following properties: +- compatible : Should at least contain "arm,gic-v3-its". +- msi-controller : Boolean property. Identifies the node as an MSI controller +- #msi-cells: Must be <1>. The single msi-cell is the DeviceID of the device + which will generate the MSI. +- reg: Specifies the base physical address and size of the ITS + registers. + +Optional: +- socionext,synquacer-pre-its: (u32, u32) tuple describing the untranslated + address and size of the pre-ITS window. + +The main GIC node must contain the appropriate #address-cells, +#size-cells and ranges properties for the reg property of all ITS +nodes. + +Examples: + + gic: interrupt-controller@2cf00000 { + compatible = "arm,gic-v3"; + #interrupt-cells = <3>; + #address-cells = <2>; + #size-cells = <2>; + ranges; + interrupt-controller; + reg = <0x0 0x2f000000 0 0x10000>, // GICD + <0x0 0x2f100000 0 0x200000>, // GICR + <0x0 0x2c000000 0 0x2000>, // GICC + <0x0 0x2c010000 0 0x2000>, // GICH + <0x0 0x2c020000 0 0x2000>; // GICV + interrupts = <1 9 4>; + + msi-controller; + mbi-ranges = <256 128>; + + gic-its@2c200000 { + compatible = "arm,gic-v3-its"; + msi-controller; + #msi-cells = <1>; + reg = <0x0 0x2c200000 0 0x20000>; + }; + }; + + gic: interrupt-controller@2c010000 { + compatible = "arm,gic-v3"; + #interrupt-cells = <4>; + #address-cells = <2>; + #size-cells = <2>; + ranges; + interrupt-controller; + redistributor-stride = <0x0 0x40000>; // 256kB stride + #redistributor-regions = <2>; + reg = <0x0 0x2c010000 0 0x10000>, // GICD + <0x0 0x2d000000 0 0x800000>, // GICR 1: CPUs 0-31 + <0x0 0x2e000000 0 0x800000>; // GICR 2: CPUs 32-63 + <0x0 0x2c040000 0 0x2000>, // GICC + <0x0 0x2c060000 0 0x2000>, // GICH + <0x0 0x2c080000 0 0x2000>; // GICV + interrupts = <1 9 4>; + + gic-its@2c200000 { + compatible = "arm,gic-v3-its"; + msi-controller; + #msi-cells = <1>; + reg = <0x0 0x2c200000 0 0x20000>; + }; + + gic-its@2c400000 { + compatible = "arm,gic-v3-its"; + msi-controller; + #msi-cells = <1>; + reg = <0x0 0x2c400000 0 0x20000>; + }; + + ppi-partitions { + part0: interrupt-partition-0 { + affinity = <&cpu0 &cpu2>; + }; + + part1: interrupt-partition-1 { + affinity = <&cpu1 &cpu3>; + }; + }; + }; + + + device@0 { + reg = <0 0 0 4>; + interrupts = <1 1 4 &part0>; + }; |