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u-boot/drivers/firmware/scmi/Kconfig
Etienne Carriere 48108f3a6a firmware: scmi: Add OP-TEE transport
This change implements an SCMI transport for agent interfacing the
OP-TEE SCMI service. OP-TEE provides an SCMI PTA (Pseudo-TA) for
non-secure world to send SCMI messages over an identified channel.
The driver implemented here uses a SMT shared memory for passing
messages between client and server.

The implementation opens and releases channel resources for each
passed SCMI message so that resources allocated (sessions) or
registered (shared memory areas) in OP-TEE firmware are released for
example before relocation as the driver will likely allocate/register
them back when probed after relocation.

The integration of the driver using dedicated config switch
CONFIG_SCMI_AGENT_OPTEE is designed on the model posted to the
U-Boot ML by Patrick Delaunay [1].

Link: [1] https://lore.kernel.org/all/20211028191222.v3.4.Ib2e58ee67f4d023823d8b5404332dc4d7e847277@changeid/
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: Wolfgang Denk <wd@denx.de>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2021-11-23 13:54:43 -05:00

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config SCMI_FIRMWARE
bool "Enable SCMI support"
select FIRMWARE
select OF_TRANSLATE
depends on SANDBOX || DM_MAILBOX || ARM_SMCCC || OPTEE
help
System Control and Management Interface (SCMI) is a communication
protocol that defines standard interfaces for power, performance
and system management. The SCMI specification is available at
https://developer.arm.com/architectures/system-architectures/software-standards/scmi
An SCMI agent communicates with a related SCMI server firmware
located in another sub-system, as a companion micro controller
or a companion host in the CPU system.
Communications between agent (client) and the SCMI server are
based on message exchange. Messages can be exchanged over transport
channels as a mailbox device or an Arm SMCCC service with some
piece of identified shared memory.
config SCMI_AGENT_MAILBOX
bool "Enable SCMI agent mailbox"
depends on SCMI_FIRMWARE && DM_MAILBOX
default y
help
Enable the SCMI communication channel based on mailbox
for compatible "arm,scmi".
config SCMI_AGENT_SMCCC
bool "Enable SCMI agent SMCCC"
depends on SCMI_FIRMWARE && ARM_SMCCC
default y
help
Enable the SCMI communication channel based on Arm SMCCC service for
compatible "arm,scmi-smc".
config SCMI_AGENT_OPTEE
bool "Enable SCMI agent OP-TEE"
depends on SCMI_FIRMWARE && OPTEE
default y
help
Enable the SCMI communication channel based on OP-TEE transport
for compatible "linaro,scmi-optee".