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x86: Add support for ACPI general-purpose events

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ACPI GPEs are used to signal interrupts from peripherals that are accessed
via ACPI. In U-Boot these are modelled as interrupts using a separate
interrupt controller. Configuration is via the device tree.

Add a simple driver for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-02-06 09:55:01 -07:00 • committed by Bin Meng
parent 025543554c
commit e85cbe8b34
4 changed files with 149 additions and 0 deletions
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30
doc/device-tree-bindings/interrupt-controller/intel,acpi-gpe.txt Normal file
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* Intel Advanced Configuration and Power Interface General Purpose Events
This describes an interrupt controller which provides access to GPEs supported
by the SoC.
Required properties:
- compatible : "intel,acpi-gpe"
- interrupt-controller : Identifies the node as an interrupt controller
- #interrupt-cells : The number of cells to define the interrupts. Must be 2:
cell 0: interrupt number (normally >=32 since GPEs below that are reserved)
cell 1: 0 (flags, but none are currently defined)
- reg : The register bank for the controller (set this to the ACPI base).
Example:
general-purpose-events {
reg = <IOMAP_ACPI_BASE IOMAP_ACPI_SIZE>;
compatible = "intel,acpi-gpe";
interrupt-controller;
#interrupt-cells = <2>;
};
...
tpm@50 {
reg = <0x50>;
compatible = "google,cr50";
ready-gpio = <&gpio_n 0x1c GPIO_ACTIVE_LOW>;
interrupts-extended = <&acpi_gpe 0x3c 0>;
};