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670310dfba
Pull irq core updates from Thomas Gleixner:
"A rather large update for the interrupt core code and the irq chip drivers:
- Add a new bitmap matrix allocator and supporting changes, which is
used to replace the x86 vector allocator which comes with separate
pull request. This allows to replace the convoluted nested loop
allocation function in x86 with a facility which supports the
recently added property of managed interrupts proper and allows to
switch to a best effort vector reservation scheme, which addresses
problems with vector exhaustion.
- A large update to the ARM GIC-V3-ITS driver adding support for
range selectors.
- New interrupt controllers:
- Meson and Meson8 GPIO
- BCM7271 L2
- Socionext EXIU
If you expected that this will stop at some point, I have to
disappoint you. There are new ones posted already. Sigh!
- STM32 interrupt controller support for new platforms.
- A pile of fixes, cleanups and updates to the MIPS GIC driver
- The usual small fixes, cleanups and updates all over the place.
Most visible one is to move the irq chip drivers Kconfig switches
into a separate Kconfig menu"
* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits)
genirq: Fix type of shifting literal 1 in __setup_irq()
irqdomain: Drop pointless NULL check in virq_debug_show_one
genirq/proc: Return proper error code when irq_set_affinity() fails
irq/work: Use llist_for_each_entry_safe
irqchip: mips-gic: Print warning if inherited GIC base is used
irqchip/mips-gic: Add pr_fmt and reword pr_* messages
irqchip/stm32: Move the wakeup on interrupt mask
irqchip/stm32: Fix initial values
irqchip/stm32: Add stm32h7 support
dt-bindings/interrupt-controllers: Add compatible string for stm32h7
irqchip/stm32: Add multi-bank management
irqchip/stm32: Select GENERIC_IRQ_CHIP
irqchip/exiu: Add support for Socionext Synquacer EXIU controller
dt-bindings: Add description of Socionext EXIU interrupt controller
irqchip/gic-v3-its: Fix VPE activate callback return value
irqchip: mips-gic: Make IPI bitmaps static
irqchip: mips-gic: Share register writes in gic_set_type()
irqchip: mips-gic: Remove gic_vpes variable
irqchip: mips-gic: Use num_possible_cpus() to reserve IPIs
irqchip: mips-gic: Configure EIC when CPUs come online
...
157 lines
4.8 KiB
Plaintext
157 lines
4.8 KiB
Plaintext
* ARM Generic Interrupt Controller, version 3
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AArch64 SMP cores are often associated with a GICv3, providing Private
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Peripheral Interrupts (PPI), Shared Peripheral Interrupts (SPI),
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Software Generated Interrupts (SGI), and Locality-specific Peripheral
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Interrupts (LPI).
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Main node required properties:
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- compatible : should at least contain "arm,gic-v3".
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- interrupt-controller : Identifies the node as an interrupt controller
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- #interrupt-cells : Specifies the number of cells needed to encode an
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interrupt source. Must be a single cell with a value of at least 3.
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If the system requires describing PPI affinity, then the value must
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be at least 4.
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The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
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interrupts. Other values are reserved for future use.
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The 2nd cell contains the interrupt number for the interrupt type.
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SPI interrupts are in the range [0-987]. PPI interrupts are in the
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range [0-15].
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The 3rd cell is the flags, encoded as follows:
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bits[3:0] trigger type and level flags.
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1 = edge triggered
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4 = level triggered
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The 4th cell is a phandle to a node describing a set of CPUs this
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interrupt is affine to. The interrupt must be a PPI, and the node
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pointed must be a subnode of the "ppi-partitions" subnode. For
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interrupt types other than PPI or PPIs that are not partitionned,
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this cell must be zero. See the "ppi-partitions" node description
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below.
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Cells 5 and beyond are reserved for future use and must have a value
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of 0 if present.
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- reg : Specifies base physical address(s) and size of the GIC
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registers, in the following order:
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- GIC Distributor interface (GICD)
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- GIC Redistributors (GICR), one range per redistributor region
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- GIC CPU interface (GICC)
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- GIC Hypervisor interface (GICH)
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- GIC Virtual CPU interface (GICV)
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GICC, GICH and GICV are optional.
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- interrupts : Interrupt source of the VGIC maintenance interrupt.
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Optional
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- redistributor-stride : If using padding pages, specifies the stride
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of consecutive redistributors. Must be a multiple of 64kB.
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- #redistributor-regions: The number of independent contiguous regions
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occupied by the redistributors. Required if more than one such
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region is present.
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Sub-nodes:
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PPI affinity can be expressed as a single "ppi-partitions" node,
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containing a set of sub-nodes, each with the following property:
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- affinity: Should be a list of phandles to CPU nodes (as described in
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Documentation/devicetree/bindings/arm/cpus.txt).
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GICv3 has one or more Interrupt Translation Services (ITS) that are
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used to route Message Signalled Interrupts (MSI) to the CPUs.
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These nodes must have the following properties:
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- compatible : Should at least contain "arm,gic-v3-its".
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- msi-controller : Boolean property. Identifies the node as an MSI controller
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- #msi-cells: Must be <1>. The single msi-cell is the DeviceID of the device
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which will generate the MSI.
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- reg: Specifies the base physical address and size of the ITS
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registers.
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Optional:
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- socionext,synquacer-pre-its: (u32, u32) tuple describing the untranslated
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address and size of the pre-ITS window.
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The main GIC node must contain the appropriate #address-cells,
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#size-cells and ranges properties for the reg property of all ITS
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nodes.
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Examples:
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gic: interrupt-controller@2cf00000 {
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compatible = "arm,gic-v3";
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#interrupt-cells = <3>;
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#address-cells = <2>;
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#size-cells = <2>;
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ranges;
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interrupt-controller;
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reg = <0x0 0x2f000000 0 0x10000>, // GICD
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<0x0 0x2f100000 0 0x200000>, // GICR
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<0x0 0x2c000000 0 0x2000>, // GICC
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<0x0 0x2c010000 0 0x2000>, // GICH
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<0x0 0x2c020000 0 0x2000>; // GICV
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interrupts = <1 9 4>;
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gic-its@2c200000 {
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compatible = "arm,gic-v3-its";
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msi-controller;
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#msi-cells = <1>;
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reg = <0x0 0x2c200000 0 0x20000>;
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};
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};
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gic: interrupt-controller@2c010000 {
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compatible = "arm,gic-v3";
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#interrupt-cells = <4>;
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#address-cells = <2>;
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#size-cells = <2>;
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ranges;
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interrupt-controller;
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redistributor-stride = <0x0 0x40000>; // 256kB stride
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#redistributor-regions = <2>;
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reg = <0x0 0x2c010000 0 0x10000>, // GICD
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<0x0 0x2d000000 0 0x800000>, // GICR 1: CPUs 0-31
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<0x0 0x2e000000 0 0x800000>; // GICR 2: CPUs 32-63
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<0x0 0x2c040000 0 0x2000>, // GICC
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<0x0 0x2c060000 0 0x2000>, // GICH
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<0x0 0x2c080000 0 0x2000>; // GICV
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interrupts = <1 9 4>;
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gic-its@2c200000 {
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compatible = "arm,gic-v3-its";
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msi-controller;
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#msi-cells = <1>;
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reg = <0x0 0x2c200000 0 0x20000>;
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};
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gic-its@2c400000 {
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compatible = "arm,gic-v3-its";
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msi-controller;
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#msi-cells = <1>;
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reg = <0x0 0x2c400000 0 0x20000>;
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};
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ppi-partitions {
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part0: interrupt-partition-0 {
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affinity = <&cpu0 &cpu2>;
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};
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part1: interrupt-partition-1 {
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affinity = <&cpu1 &cpu3>;
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};
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};
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};
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device@0 {
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reg = <0 0 0 4>;
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interrupts = <1 1 4 &part0>;
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};
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