Documentation/devicetree/bindings/arm/gic-v3.txt

   1 * ARM Generic Interrupt Controller, version 3
   2
   3 AArch64 SMP cores are often associated with a GICv3, providing Private
   4 Peripheral Interrupts (PPI), Shared Peripheral Interrupts (SPI),
   5 Software Generated Interrupts (SGI), and Locality-specific Peripheral
   6 Interrupts (LPI).
   7
   8 Main node required properties:
   9
  10 - compatible : should at least contain  "arm,gic-v3".
  11 - interrupt-controller : Identifies the node as an interrupt controller
  12 - #interrupt-cells : Specifies the number of cells needed to encode an
  13   interrupt source. Must be a single cell with a value of at least 3.
  14
  15   The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
  16   interrupts. Other values are reserved for future use.
  17
  18   The 2nd cell contains the interrupt number for the interrupt type.
  19   SPI interrupts are in the range [0-987]. PPI interrupts are in the
  20   range [0-15].
  21
  22   The 3rd cell is the flags, encoded as follows:
  23         bits[3:0] trigger type and level flags.
  24                 1 = edge triggered
  25                 4 = level triggered
  26
  27   Cells 4 and beyond are reserved for future use. When the 1st cell
  28   has a value of 0 or 1, cells 4 and beyond act as padding, and may be
  29   ignored. It is recommended that padding cells have a value of 0.
  30
  31 - reg : Specifies base physical address(s) and size of the GIC
  32   registers, in the following order:
  33   - GIC Distributor interface (GICD)
  34   - GIC Redistributors (GICR), one range per redistributor region
  35   - GIC CPU interface (GICC)
  36   - GIC Hypervisor interface (GICH)
  37   - GIC Virtual CPU interface (GICV)
  38
  39   GICC, GICH and GICV are optional.
  40
  41 - interrupts : Interrupt source of the VGIC maintenance interrupt.
  42
  43 Optional
  44
  45 - redistributor-stride : If using padding pages, specifies the stride
  46   of consecutive redistributors. Must be a multiple of 64kB.
  47
  48 - #redistributor-regions: The number of independent contiguous regions
  49   occupied by the redistributors. Required if more than one such
  50   region is present.
  51
  52 Sub-nodes:
  53
  54 GICv3 has one or more Interrupt Translation Services (ITS) that are
  55 used to route Message Signalled Interrupts (MSI) to the CPUs.
  56
  57 These nodes must have the following properties:
  58 - compatible : Should at least contain  "arm,gic-v3-its".
  59 - msi-controller : Boolean property. Identifies the node as an MSI controller
  60 - reg: Specifies the base physical address and size of the ITS
  61   registers.
  62
  63 The main GIC node must contain the appropriate #address-cells,
  64 #size-cells and ranges properties for the reg property of all ITS
  65 nodes.
  66
  67 Examples:
  68
  69         gic: interrupt-controller@2cf00000 {
  70                 compatible = "arm,gic-v3";
  71                 #interrupt-cells = <3>;
  72                 #address-cells = <2>;
  73                 #size-cells = <2>;
  74                 ranges;
  75                 interrupt-controller;
  76                 reg = <0x0 0x2f000000 0 0x10000>,       // GICD
  77                       <0x0 0x2f100000 0 0x200000>,      // GICR
  78                       <0x0 0x2c000000 0 0x2000>,        // GICC
  79                       <0x0 0x2c010000 0 0x2000>,        // GICH
  80                       <0x0 0x2c020000 0 0x2000>;        // GICV
  81                 interrupts = <1 9 4>;
  82
  83                 gic-its@2c200000 {
  84                         compatible = "arm,gic-v3-its";
  85                         msi-controller;
  86                         reg = <0x0 0x2c200000 0 0x200000>;
  87                 };
  88         };
  89
  90         gic: interrupt-controller@2c010000 {
  91                 compatible = "arm,gic-v3";
  92                 #interrupt-cells = <3>;
  93                 #address-cells = <2>;
  94                 #size-cells = <2>;
  95                 ranges;
  96                 interrupt-controller;
  97                 redistributor-stride = <0x0 0x40000>;   // 256kB stride
  98                 #redistributor-regions = <2>;
  99                 reg = <0x0 0x2c010000 0 0x10000>,       // GICD
 100                       <0x0 0x2d000000 0 0x800000>,      // GICR 1: CPUs 0-31
 101                       <0x0 0x2e000000 0 0x800000>;      // GICR 2: CPUs 32-63
 102                       <0x0 0x2c040000 0 0x2000>,        // GICC
 103                       <0x0 0x2c060000 0 0x2000>,        // GICH
 104                       <0x0 0x2c080000 0 0x2000>;        // GICV
 105                 interrupts = <1 9 4>;
 106
 107                 gic-its@2c200000 {
 108                         compatible = "arm,gic-v3-its";
 109                         msi-controller;
 110                         reg = <0x0 0x2c200000 0 0x200000>;
 111                 };
 112
 113                 gic-its@2c400000 {
 114                         compatible = "arm,gic-v3-its";
 115                         msi-controller;
 116                         reg = <0x0 0x2c400000 0 0x200000>;
 117                 };
 118         };