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* 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" or either
"qcom,msm8996-gic-v3", "arm,gic-v3" for msm8996 SoCs
to address SoC specific bugs/quirks
- 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.yaml).
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>;
};
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