From 5f90f189a052f6fc46048f6ce29a37b709548b81 Mon Sep 17 00:00:00 2001 From: Etienne Carriere Date: Thu, 28 Oct 2021 16:00:09 +0200 Subject: firmware: arm_scmi: Add optee transport Add a new transport channel to the SCMI firmware interface driver for SCMI message exchange based on optee transport channel. The optee transport is realized by connecting and invoking OP-TEE SCMI service interface PTA. Optee transport support (CONFIG_ARM_SCMI_TRANSPORT_OPTEE) is default enabled when optee driver (CONFIG_OPTEE) is enabled. Effective optee transport is setup upon OP-TEE SCMI service discovery at optee device initialization. For this SCMI UUID is registered to the optee bus for probing. This is done from the link_supplier operator of the SCMI optee transport. The optee transport can use a statically defined shared memory in which case SCMI device tree node defines it using an "arm,scmi-shmem" compatible phandle through property shmem. Alternatively, optee transport allocates the shared memory buffer from the optee driver when no shmem property is defined. The protocol used to exchange SCMI message over that shared memory is negotiated between optee transport driver and the OP-TEE service through capabilities exchange. OP-TEE SCMI service is integrated in OP-TEE since its release tag 3.13.0. The service interface is published in [1]. Link: [1] https://github.com/OP-TEE/optee_os/blob/3.13.0/lib/libutee/include/pta_scmi_client.h Link: https://lore.kernel.org/r/20211028140009.23331-2-etienne.carriere@linaro.org Cc: Cristian Marussi Cc: Sudeep Holla Reviewed-by: Cristian Marussi Signed-off-by: Etienne Carriere Signed-off-by: Sudeep Holla --- drivers/firmware/arm_scmi/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/firmware/arm_scmi/Kconfig') diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig index 3d7081e84853..da1daa593204 100644 --- a/drivers/firmware/arm_scmi/Kconfig +++ b/drivers/firmware/arm_scmi/Kconfig @@ -54,6 +54,18 @@ config ARM_SCMI_TRANSPORT_MAILBOX 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 + 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 -- cgit v1.2.3