arm64: Add a driver for the Arm PL031 RTC

It is a simple RTC found in some Arm SoCs, e.g. the Arm Juno.

Reviewed by: manu
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D4

arm64: Add a driver for the Arm PL031 RTC

It is a simple RTC found in some Arm SoCs, e.g. the Arm Juno.

Reviewed by: manu
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D41267

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arm64: Move device scmi to std.arm

The scmi driver in its current form requires the arm_doorbell
driver to communicate with the firmware.
The arm_doorbell is only found in ARM Juno reference board (

arm64: Move device scmi to std.arm

The scmi driver in its current form requires the arm_doorbell
driver to communicate with the firmware.
The arm_doorbell is only found in ARM Juno reference board (and
apparently on Morello too).
If we want to use scmi on other platform (like some rockchip or imx
soc), the driver needs to be updated to support svc/shmem communication
with the firmware.
For now since it can be only used with arm_doorbell move the device to
std.arm otherwise kernel configs like ALLWINNER or ROCKCHIP fails to build.

Reviewed by: br, imp
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D37953

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Add support for ARM System Control and Management Interface (SCMI) v3.1.

The SCMI specification describes a set of standard interfaces for power,
performance and system management.

SCMI is extensib

Add support for ARM System Control and Management Interface (SCMI) v3.1.

The SCMI specification describes a set of standard interfaces for power,
performance and system management.

SCMI is extensible and provides interfaces to access functions which are
often implemented in firmwares in the System Control Processor (SCP).

This implements Shared Memory-based transfer, which is one of the ways on
how messages are exchanged between agents and the platform.

This includes a driver for ARM Message Handling Unit (MHU) Doorbell, which
is a mechanism that the caller can use to alert the callee of the presence
of a message.

The support implements clock management interface. For instance this allows
us to control HDMI pixel clock on ARM Morello Board.

Tested on ARM Morello Board.

Obtained from: CheriBSD
Differential Revision: https://reviews.freebsd.org/D37316
Reviewed by: manu
Sponsored by: UKRI

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arm64: Add per SoC family kernel config

There is multiple reason for this :
- This makes it easier to see which driver is needed for each SoC
- This makes it easier to create a custom config for one

arm64: Add per SoC family kernel config

There is multiple reason for this :
- This makes it easier to see which driver is needed for each SoC
- This makes it easier to create a custom config for one SoC
- This really reduce boot time (which some people might want)

Some explaination about the files :
- std.arm64 contains all standard kernel option
- std.dev contains all the standard kernel devices
- std.<soc> contains all drivers needed to boot on this SoC family
- <SOC> includes std.arm64, std.dev and std.<soc>
- GENERIC includes std.arm64, std.dev and all std.<soc>

Sponsored by: Diablotin Systems
MFC After: 2 months
Reviewed by: mmel, cognet, imp
Differential Revision: https://reviews.freebsd.org/D30474

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