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Date: Wed, 7 Jun 2017 09:11:31 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Palmer Dabbelt <palmer@...belt.com>
Cc: Linux-Arch <linux-arch@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
albert@...ive.com, patches@...ups.riscv.org,
"Wesley W. Terpstra" <wesley@...ive.com>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <Marc.Zyngier@....com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 08/17] dts: include documentation for the RISC-V interrupt controllers
CC irqchip and devicetree folks
On Wed, Jun 7, 2017 at 12:59 AM, Palmer Dabbelt <palmer@...belt.com> wrote:
> From: "Wesley W. Terpstra" <wesley@...ive.com>
>
> Signed-off-by: Palmer Dabbelt <palmer@...belt.com>
> ---
> .../interrupt-controller/riscv,cpu-intc.txt | 46 ++++++++++++++++++++++
> .../bindings/interrupt-controller/riscv,plic0.txt | 44 +++++++++++++++++++++
> 2 files changed, 90 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
> create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,plic0.txt
>
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
> new file mode 100644
> index 000000000000..62f02e834ff9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,cpu-intc.txt
> @@ -0,0 +1,46 @@
> +RISC-V Hart-Level Interrupt Controller (HLIC)
> +---------------------------------------------
> +
> +RISC-V cores include Control Status Registers (CSRs) which are local to each
> +hart and can be read or written by software. Some of these CSRs are used to
> +control local interrupts connected to the core.
> +
> +Typical examples of local interrupts on a RISC-V core include: software IPI
> +interrupts, timer interrupts, and a link to the PLIC interrupt controller.
> +
> +Required properties:
> +- compatible : "riscv,cpu-intc"
> +- #interrupt-cells : should be <1>
> +- interrupt-controller : Identifies the node as an interrupt controller
> +
> +Furthermore, this interrupt-controller MUST be embedded inside the cpu
> +definition of the hart whose CSRs control these local interrupts.
> +
> +Example:
> +
> + cpu1: cpu@1 {
> + clock-frequency = <1600000000>;
> + compatible = "riscv";
> + d-cache-block-size = <64>;
> + d-cache-sets = <64>;
> + d-cache-size = <16384>;
> + d-tlb-sets = <1>;
> + d-tlb-size = <32>;
> + device_type = "cpu";
> + i-cache-block-size = <64>;
> + i-cache-sets = <64>;
> + i-cache-size = <16384>;
> + i-tlb-sets = <1>;
> + i-tlb-size = <32>;
> + mmu-type = "riscv,sv39";
> + next-level-cache = <&L2>;
> + reg = <1>;
> + riscv,isa = "rv64imac";
> + status = "okay";
> + tlb-split;
> + cpu1-intc: interrupt-controller {
> + #interrupt-cells = <1>;
> + compatible = "riscv,cpu-intc";
> + interrupt-controller;
> + };
> + };
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,plic0.txt b/Documentation/devicetree/bindings/interrupt-controller/riscv,plic0.txt
> new file mode 100644
> index 000000000000..c05b5806f7d2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,plic0.txt
> @@ -0,0 +1,44 @@
> +RISC-V Platform-Level Interrupt Controller (PLIC)
> +-------------------------------------------------
> +
> +RISC-V cores typically include a PLIC, which route interrupts from multiple
> +devices to multiple hart contexts. The PLIC is connected to the interrupt
> +controller embedded in a RISC-V core via the interrupt-related CSRs.
> +
> +A hart context is a priviledge 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 priviledge 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 firs. 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.
> +
> +Required properties:
> +- compatible : "riscv,plic0"
> +- #address-cells : should be <0>
> +- #interrupt-cells : should be <1>
> +- interrupt-controller : Identifies the node as an interrupt controller
> +- reg : Should contain 1 register range (address and length)
> +- riscv,ndev : Specifies the number of interrupts attached to the PLIC
> +- interrupts-extended : Specifies which contexts are connected to the PLIC
> +
> +Example:
> +
> + plic: interrupt-controller@...0000 {
> + #address-cells = <0>;
> + #interrupt-cells = <1>;
> + compatible = "riscv,plic0";
> + 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>;
> + };
> --
> 2.13.0
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