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# SPDX-License-Identifier: GPL-2.0-only
menu "ARM System Control and Management Interface Protocol"
config ARM_SCMI_PROTOCOL
tristate "ARM System Control and Management Interface (SCMI) Message Protocol"
depends on ARM || ARM64 || COMPILE_TEST
help
ARM System Control and Management Interface (SCMI) protocol is a
set of operating system-independent software interfaces that are
used in system management. SCMI is extensible and currently provides
interfaces for: Discovery and self-description of the interfaces
it supports, Power domain management which is the ability to place
a given device or domain into the various power-saving states that
it supports, Performance management which is the ability to control
the performance of a domain that is composed of compute engines
such as application processors and other accelerators, Clock
management which is the ability to set and inquire rates on platform
managed clocks and Sensor management which is the ability to read
sensor data, and be notified of sensor value.
This protocol library provides interface for all the client drivers
making use of the features offered by the SCMI.
if ARM_SCMI_PROTOCOL
config ARM_SCMI_HAVE_TRANSPORT
bool
help
This declares whether at least one SCMI transport has been configured.
Used to trigger a build bug when trying to build SCMI without any
configured transport.
config ARM_SCMI_HAVE_SHMEM
bool
help
This declares whether a shared memory based transport for SCMI is
available.
config ARM_SCMI_HAVE_MSG
bool
help
This declares whether a message passing based transport for SCMI is
available.
config ARM_SCMI_TRANSPORT_MAILBOX
bool "SCMI transport based on Mailbox"
depends on MAILBOX
select ARM_SCMI_HAVE_TRANSPORT
select ARM_SCMI_HAVE_SHMEM
default y
help
Enable mailbox based transport for SCMI.
If you want the ARM SCMI PROTOCOL stack to include support for a
transport based on mailboxes, answer Y.
config ARM_SCMI_TRANSPORT_OPTEE
bool "SCMI transport based on OP-TEE service"
depends on OPTEE=y || OPTEE=ARM_SCMI_PROTOCOL
select ARM_SCMI_HAVE_TRANSPORT
select ARM_SCMI_HAVE_SHMEM
select ARM_SCMI_HAVE_MSG
default y
help
This enables the OP-TEE service based transport for SCMI.
If you want the ARM SCMI PROTOCOL stack to include support for a
transport based on OP-TEE SCMI service, answer Y.
config ARM_SCMI_TRANSPORT_SMC
bool "SCMI transport based on SMC"
depends on HAVE_ARM_SMCCC_DISCOVERY
select ARM_SCMI_HAVE_TRANSPORT
select ARM_SCMI_HAVE_SHMEM
default y
help
Enable SMC based transport for SCMI.
If you want the ARM SCMI PROTOCOL stack to include support for a
transport based on SMC, answer Y.
config ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE
bool "Enable atomic mode support for SCMI SMC transport"
depends on ARM_SCMI_TRANSPORT_SMC
help
Enable support of atomic operation for SCMI SMC based transport.
If you want the SCMI SMC based transport to operate in atomic
mode, avoiding any kind of sleeping behaviour for selected
transactions on the TX path, answer Y.
Enabling atomic mode operations allows any SCMI driver using this
transport to optionally ask for atomic SCMI transactions and operate
in atomic context too, at the price of using a number of busy-waiting
primitives all over instead. If unsure say N.
config ARM_SCMI_TRANSPORT_VIRTIO
bool "SCMI transport based on VirtIO"
depends on VIRTIO=y || VIRTIO=ARM_SCMI_PROTOCOL
select ARM_SCMI_HAVE_TRANSPORT
select ARM_SCMI_HAVE_MSG
help
This enables the virtio based transport for SCMI.
If you want the ARM SCMI PROTOCOL stack to include support for a
transport based on VirtIO, answer Y.
config ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE
bool "SCMI VirtIO transport Version 1 compliance"
depends on ARM_SCMI_TRANSPORT_VIRTIO
default y
help
This enforces strict compliance with VirtIO Version 1 specification.
If you want the ARM SCMI VirtIO transport layer to refuse to work
with Legacy VirtIO backends and instead support only VirtIO Version 1
devices (or above), answer Y.
If you want instead to support also old Legacy VirtIO backends (like
the ones implemented by kvmtool) and let the core Kernel VirtIO layer
take care of the needed conversions, say N.
config ARM_SCMI_TRANSPORT_VIRTIO_ATOMIC_ENABLE
bool "Enable atomic mode for SCMI VirtIO transport"
depends on ARM_SCMI_TRANSPORT_VIRTIO
help
Enable support of atomic operation for SCMI VirtIO based transport.
If you want the SCMI VirtIO based transport to operate in atomic
mode, avoiding any kind of sleeping behaviour for selected
transactions on the TX path, answer Y.
Enabling atomic mode operations allows any SCMI driver using this
transport to optionally ask for atomic SCMI transactions and operate
in atomic context too, at the price of using a number of busy-waiting
primitives all over instead. If unsure say N.
endif #ARM_SCMI_PROTOCOL
config ARM_SCMI_POWER_DOMAIN
tristate "SCMI power domain driver"
depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF)
default y
select PM_GENERIC_DOMAINS if PM
help
This enables support for the SCMI power domains which can be
enabled or disabled via the SCP firmware
This driver can also be built as a module. If so, the module
will be called scmi_pm_domain. Note this may needed early in boot
before rootfs may be available.
endmenu
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