This series adds support for the "hardware message box" in sun8i, sun9i, and sun50i SoCs, used for communication with the ARISC management processor (the platform's equivalent of the ARM SCP). The end goal is to use the arm_scpi driver as a client, communicating with firmware running on the AR100 CPU, or to use the mailbox to forward NMIs that the firmware picks up from R_INTC. Unfortunately, the ARM SCPI client no longer works with this driver since it now exposes all 8 hardware FIFOs individually. The SCPI client could be made to work (and I posted proof-of-concept code to that effect with v1 of this series), but that is a low priority, as Linux does not directly use SCPI with the current firmware version; all SCPI use goes through ATF via PSCI. An example usage is included at the end of this patch series. The IRQ forwarding code is WIP and not even RFC quality yet, but it does work. To build the firmware component, run: git clone https://github.com/crust-firmware/meta meta git clone https://github.com/smaeul/crust -b linux-mailbox-example meta/crust cd meta make That will by default produce a U-Boot + ATF + SCP firmware image in [meta/]build/pinebook/u-boot-sunxi-with-spl.bin. See the top-level README.md for more information (like cross-compiler setup). The IRQ-forwarding mailbox server is implemented in [meta/crust/]common/irqf.c. With that firmware and the full patch series here (on top of torvalds/master), Linux boots and is able to receive NMIs from the PMIC (i.e. use `showkey` to see that the power button works, and see that /proc/interrupts updates). As an added bonus, suspend/resume also mostly works :) Changes from v2: - Merge patches 1-3 - Add a comment in the code explaining the CLK_IS_CRITICAL usage - Add a patch to mark the AR100 clocks as critical - Use YAML for the device tree binding - Include a not-for-merge example usage of the mailbox. Changes from v1: - Marked message box clocks as critical instead of hacks in the driver - 8 unidirectional channels instead of 4 bidirectional pairs - Use per-SoC compatible strings and an A31 fallback compatible - Dropped the mailbox framework patch - Include DT patches for SoCs that document the message box Samuel Holland (15): clk: sunxi-ng: Mark msgbox clocks as critical clk: sunxi-ng: Mark AR100 clocks as critical dt-bindings: mailbox: Add a sunxi message box binding mailbox: sunxi-msgbox: Add a new mailbox driver ARM: dts: sunxi: a80: Add msgbox node ARM: dts: sunxi: a83t: Add msgbox node ARM: dts: sunxi: h3/h5: Add msgbox node arm64: dts: allwinner: a64: Add msgbox node arm64: dts: allwinner: h6: Add msgbox node [NOT FOR MERGE] clk: sunxi-ng: sun8i: Avoid turning off unused PRCM gates [NOT FOR MERGE] dt-bindings: Add a binding for a mailbox-backed interrupt controller [NOT FOR MERGE] irqchip/mbox: Introduce a mailbox-backed irqchip driver [NOT FOR MERGE] arm64: dts: allwinner: a64: Add interrupt controller node [NOT FOR MERGE] arm64: dts: allwinner: a64: Convert DTS to use msgbox_intc [NOT FOR MERGE] arm64: dts: allwinner: a64: Remove unused r_intc .../interrupt-controller/mbox-intc.txt | 33 ++ .../mailbox/allwinner,sunxi-msgbox.yaml | 79 +++++ arch/arm/boot/dts/sun8i-a83t.dtsi | 10 + arch/arm/boot/dts/sun9i-a80.dtsi | 10 + arch/arm/boot/dts/sunxi-h3-h5.dtsi | 10 + .../allwinner/sun50i-a64-amarula-relic.dts | 4 +- .../dts/allwinner/sun50i-a64-bananapi-m64.dts | 4 +- .../dts/allwinner/sun50i-a64-nanopi-a64.dts | 4 +- .../dts/allwinner/sun50i-a64-olinuxino.dts | 4 +- .../dts/allwinner/sun50i-a64-orangepi-win.dts | 4 +- .../boot/dts/allwinner/sun50i-a64-pine64.dts | 4 +- .../dts/allwinner/sun50i-a64-pinebook.dts | 4 +- .../boot/dts/allwinner/sun50i-a64-sopine.dtsi | 4 +- .../boot/dts/allwinner/sun50i-a64-teres-i.dts | 4 +- arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 27 +- arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 10 + drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 3 +- drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c | 2 +- drivers/clk/sunxi-ng/ccu-sun50i-h6.c | 3 +- drivers/clk/sunxi-ng/ccu-sun8i-a23.c | 3 +- drivers/clk/sunxi-ng/ccu-sun8i-a33.c | 3 +- drivers/clk/sunxi-ng/ccu-sun8i-a83t.c | 3 +- drivers/clk/sunxi-ng/ccu-sun8i-h3.c | 3 +- drivers/clk/sunxi-ng/ccu-sun8i-r.c | 20 +- drivers/clk/sunxi-ng/ccu-sun9i-a80.c | 3 +- drivers/irqchip/Kconfig | 9 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-mbox.c | 199 +++++++++++ drivers/mailbox/Kconfig | 11 + drivers/mailbox/Makefile | 2 + drivers/mailbox/sunxi-msgbox.c | 315 ++++++++++++++++++ 31 files changed, 750 insertions(+), 45 deletions(-) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt create mode 100644 Documentation/devicetree/bindings/mailbox/allwinner,sunxi-msgbox.yaml create mode 100644 drivers/irqchip/irq-mbox.c create mode 100644 drivers/mailbox/sunxi-msgbox.c -- 2.19.2
