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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml')
-rw-r--r-- | Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml new file mode 100644 index 000000000..b9a61c9f7 --- /dev/null +++ b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml @@ -0,0 +1,97 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +# Copyright (C) 2020 SiFive, Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/interrupt-controller/sifive,plic-1.0.0.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: SiFive Platform-Level Interrupt Controller (PLIC) + +description: + SiFive SOCs include an implementation of the Platform-Level Interrupt Controller + (PLIC) high-level specification in the RISC-V Privileged Architecture + specification. The PLIC connects all external interrupts in the system to all + hart contexts in the system, via the external interrupt source in each hart. + + A hart context is a privilege mode in a hardware execution thread. For example, + in an 4 core system with 2-way SMT, you have 8 harts and probably at least two + privilege modes per hart; machine mode and supervisor mode. + + Each interrupt can be enabled on per-context basis. Any context can claim + a pending enabled interrupt and then release it once it has been handled. + + Each interrupt has a configurable priority. Higher priority interrupts are + serviced first. Each context can specify a priority threshold. Interrupts + with priority below this threshold will not cause the PLIC to raise its + interrupt line leading to the context. + + While the PLIC supports both edge-triggered and level-triggered interrupts, + interrupt handlers are oblivious to this distinction and therefore it is not + specified in the PLIC device-tree binding. + + While the RISC-V ISA doesn't specify a memory layout for the PLIC, the + "sifive,plic-1.0.0" device is a concrete implementation of the PLIC that + contains a specific memory layout, which is documented in chapter 8 of the + SiFive U5 Coreplex Series Manual <https://static.dev.sifive.com/U54-MC-RVCoreIP.pdf>. + +maintainers: + - Sagar Kadam <sagar.kadam@sifive.com> + - Paul Walmsley <paul.walmsley@sifive.com> + - Palmer Dabbelt <palmer@dabbelt.com> + +properties: + compatible: + items: + - const: sifive,fu540-c000-plic + - const: sifive,plic-1.0.0 + + reg: + maxItems: 1 + + '#address-cells': + const: 0 + + '#interrupt-cells': + const: 1 + + interrupt-controller: true + + interrupts-extended: + minItems: 1 + description: + Specifies which contexts are connected to the PLIC, with "-1" specifying + that a context is not present. Each node pointed to should be a + riscv,cpu-intc node, which has a riscv node as parent. + + riscv,ndev: + $ref: "/schemas/types.yaml#/definitions/uint32" + description: + Specifies how many external interrupts are supported by this controller. + +required: + - compatible + - '#address-cells' + - '#interrupt-cells' + - interrupt-controller + - reg + - interrupts-extended + - riscv,ndev + +additionalProperties: false + +examples: + - | + plic: interrupt-controller@c000000 { + #address-cells = <0>; + #interrupt-cells = <1>; + compatible = "sifive,fu540-c000-plic", "sifive,plic-1.0.0"; + interrupt-controller; + interrupts-extended = < + &cpu0_intc 11 + &cpu1_intc 11 &cpu1_intc 9 + &cpu2_intc 11 &cpu2_intc 9 + &cpu3_intc 11 &cpu3_intc 9 + &cpu4_intc 11 &cpu4_intc 9>; + reg = <0xc000000 0x4000000>; + riscv,ndev = <10>; + }; |