drivers: scmi-msg: support performance domains for DVFS

Implement some of the SCMI performance domain management messages
in scmi-msg drivers to support basic DVFS scenario.

Co-developed-by: Etienn

drivers: scmi-msg: support performance domains for DVFS

Implement some of the SCMI performance domain management messages
in scmi-msg drivers to support basic DVFS scenario.

Co-developed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Pascal Paillet <p.paillet@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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scmi-msg: fix voltage domains inline comment header file

Fix voltage domains inline comment header file.

Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carrie

scmi-msg: fix voltage domains inline comment header file

Fix voltage domains inline comment header file.

Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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core: fix header file guard names

Fixes header file guards macro name prefix (mostly missing occurrences)
that should reflect the file base directory sub-path where applicable.

Reviewed-by: Jens Wi

core: fix header file guard names

Fixes header file guards macro name prefix (mostly missing occurrences)
that should reflect the file base directory sub-path where applicable.

Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: scmi-msg: add support for clock using generic clock framework

Integrating the clock framework with SCMI allows to avoid boilerplate
code to do so in platform specific files. This patch adds

drivers: scmi-msg: add support for clock using generic clock framework

Integrating the clock framework with SCMI allows to avoid boilerplate
code to do so in platform specific files. This patch adds a generic
layer that uses the generic clock framework to access and expose clocks.
SCMI clocks can be added from platform code using scmi_clk_add().
A new CFG_SCMI_MSG_USE_CLK configuration option is added to enable
this generic clock support.

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Signed-off-by: Thomas Perrot <thomas.perrot@bootlin.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: Propagate errors from platform voltd_get_level

plat_scmi_voltd_get_level is refactored to return an SCMI error code and
retrieve the voltage via an out parameter. This allows erro

drivers: scmi-msg: Propagate errors from platform voltd_get_level

plat_scmi_voltd_get_level is refactored to return an SCMI error code and
retrieve the voltage via an out parameter. This allows errors from the
platform SCMI server implementation to be propagated to the REE.

The implementation for stm32mp1 is updated to handle at least some
possible errors.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Anton Eliasson <anton.eliasson@axis.com>

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drivers: scmi-msg: add SCMI MSG message protocol

Implements MSG header protocol to handle SCMI messages. MSG header
protocol was introduced in Linux kernel v5.15 [1]. It relies on normal
cached shar

drivers: scmi-msg: add SCMI MSG message protocol

Implements MSG header protocol to handle SCMI messages. MSG header
protocol was introduced in Linux kernel v5.15 [1]. It relies on normal
cached shared memory buffer using a 32bit header followed by the SCMI
message payload.

To support this message interface, the SCMI PTA defines a new capability
and a new command. Capability PTA_SCMI_CAPS_MSG_HEADER allows client and
service to negotiate the desired transport configuration. Command
PTA_SCMI_CMD_PROCESS_MSG_CHANNEL allows client to request processing
of a message sent based on that message exchange protocol.

Platforms shall enable configuration switch CFG_SCMI_MSG_SHM_MSG to have
their SCMI service supporting that communication protocol.

Link: [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f301bba0ca7392d16a6ea4f1d264a91f1fadea1a
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: correct inline description

Fixes inline description comment of plat_scmi_clock_rates_array()
and scmi_smt_init_agent_channel().

Acked-by: Jens Wiklander <jens.wiklander@linaro.or

drivers: scmi-msg: correct inline description

Fixes inline description comment of plat_scmi_clock_rates_array()
and scmi_smt_init_agent_channel().

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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core/include/*/*.h: use U() for unsigned constants

Updates with the U() macro as described in the recently updated coding
guidelines.

Acked-by: Ruchika Gupta <ruchika.gupta@linaro.org>
Acked-by: Je

core/include/*/*.h: use U() for unsigned constants

Updates with the U() macro as described in the recently updated coding
guidelines.

Acked-by: Ruchika Gupta <ruchika.gupta@linaro.org>
Acked-by: Jerome Forissier <jerome@forissier.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

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drivers: scmi-msg: introduce scmi_smt_channel_handle()

New API function for scmi-msg drivers: sub channel ID to handle
conversion for consistency in SCMI PTA.

Signed-off-by: Etienne Carriere <etien

drivers: scmi-msg: introduce scmi_smt_channel_handle()

New API function for scmi-msg drivers: sub channel ID to handle
conversion for consistency in SCMI PTA.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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drivers: scmi-msg: add scmi_smt_set_shared_buffer()

Dynamically set/release SCMI SMT shared buffer reference. This can be
used when the caller passes the SCMI SMT shared memory reference as part
of

drivers: scmi-msg: add scmi_smt_set_shared_buffer()

Dynamically set/release SCMI SMT shared buffer reference. This can be
used when the caller passes the SCMI SMT shared memory reference as part
of OP-TEE invocation parameters instead of using a statically allocated
buffer.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome@forissier.org>

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drivers: scmi-msg: stub exported API functions

Stub exported API functions from SCMI message drivers to make
the implementation more flexible.

Signed-off-by: Etienne Carriere <etienne.carriere@lina

drivers: scmi-msg: stub exported API functions

Stub exported API functions from SCMI message drivers to make
the implementation more flexible.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome@forissier.org>

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drivers: scmi-msg: remove unused SCMI channel agent name

Remove field agent_name from struct scmi_msg_channel since unused.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by

drivers: scmi-msg: remove unused SCMI channel agent name

Remove field agent_name from struct scmi_msg_channel since unused.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome@forissier.org>

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drivers: scmi-msg: fix header file inline comments

Fix inline comments for scmi-msg API functions description.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Fori

drivers: scmi-msg: fix header file inline comments

Fix inline comments for scmi-msg API functions description.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome@forissier.org>

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drivers: scmi-msg: rename agent_id to channel_id

Rename agent_id reference to channel_id to avoid confusion with the
agent identifiers used in SCMI protocol to identify agent, whereas
the drivers on

drivers: scmi-msg: rename agent_id to channel_id

Rename agent_id reference to channel_id to avoid confusion with the
agent identifiers used in SCMI protocol to identify agent, whereas
the drivers only reference an SCMI channel, whatever the agent ID
associated with the channel and knowing that an SCMI agent can have
several channels to communicate with the SCMI platform/server.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jerome Forissier <jerome@forissier.org>

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plat-stm32mp1: scmi: prepare platform SCMI voltage regulators

Define generic resources for stm32mp1 platform to support voltage
regulators exposed to SCMI agents through the voltage domain protocol.

plat-stm32mp1: scmi: prepare platform SCMI voltage regulators

Define generic resources for stm32mp1 platform to support voltage
regulators exposed to SCMI agents through the voltage domain protocol.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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drivers: scmi-msg: add SCMI Voltage Domain protocol

SCMI Voltage Domain protocol in defined in the SCMI specification
since its version 3 [1]. This protocol allows a SCMI server to expose
voltage re

drivers: scmi-msg: add SCMI Voltage Domain protocol

SCMI Voltage Domain protocol in defined in the SCMI specification
since its version 3 [1]. This protocol allows a SCMI server to expose
voltage regulator control services. The current specification defines
services to discover the exposed regulators, to enable/disable them
and to set/get the regulator voltage level.

The protocol driver is embedded upon configuration switch
CFG_SCMI_MSG_VOLTAGE_DOMAIN.

Link: [1] https://developer.arm.com/documentation/den0056/c
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jerome Forissier <jerome@forissier.org>

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drivers: scmi-msg: fix clock rates query

Fix implementation of the clock rate query platform functions to
consider rates start index which was missing.

Fixes: a7a9e3ba71dd ("drivers/scmi-msg: suppo

drivers: scmi-msg: fix clock rates query

Fix implementation of the clock rate query platform functions to
consider rates start index which was missing.

Fixes: a7a9e3ba71dd ("drivers/scmi-msg: support for clock protocol")
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jerome Forissier <jerome@forissier.org>

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core: scmi-msg: minor cleanup

Remove useless local headers file inclusion as "common.h" is included.
Remove a useless inclusion of speculation_barrier.h.
Use BIT() in clock.h.
Refine inline descript

core: scmi-msg: minor cleanup

Remove useless local headers file inclusion as "common.h" is included.
Remove a useless inclusion of speculation_barrier.h.
Use BIT() in clock.h.
Refine inline description of scmi_msg_channel::agent_name in scmi-msg.h.
Fix typo in scmi_smt_fastcall_smc_entry() description inline comment.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome@forissier.org>

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drivers/scmi-msg: smt entry points for incoming messages

This change implements SCMI channels for reading a SCMI message from a
shared memory and call the SCMI message drivers to route the message
t

drivers/scmi-msg: smt entry points for incoming messages

This change implements SCMI channels for reading a SCMI message from a
shared memory and call the SCMI message drivers to route the message
to the target platform services.

SMT refers to the shared memory management protocol which is used
to get/put message/response in shared memory. SMT is a 28byte header
stating shared memory state and exchanged protocol data.

The processing entry for a SCMI message can be a secure interrupt
(CFG_SCMI_MSG_SMT_INTERRUPT_ENTRY=y), and fastcall SMC
(CFG_SCMI_MSG_SMT_FASTCALL_ENTRY=y) or a threaded execution
context entry (CFG_SCMI_MSG_SMT_THREAD_ENTRY=y).

SMT description in this implementation is based on the SCP-firmware
implementation [1].

Link: [1] https://github.com/ARM-software/SCP-firmware.git

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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drivers/scmi-msg: support for reset domain protocol

Adds SCMI reset domain protocol support in the SCMI message drivers
as defined in SCMI specification v2.0 [1]. Not all the messages
defined in the

drivers/scmi-msg: support for reset domain protocol

Adds SCMI reset domain protocol support in the SCMI message drivers
as defined in SCMI specification v2.0 [1]. Not all the messages
defined in the specification are supported.

Embedded upon CFG_SCMI_MSG_RESET_DOMAIN=y.

scmi_msg_get_rd_handler() sanitizes the message_id value
against any speculative use of reset domain ID as a index since by
SCMI specification, IDs are indices.

SCMI resource in this implementation are dumped or inspired by the
SCP-firmware implementation [2] of the SCMI protocol, server side.

Link: [1] http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf
Link: [2] https://github.com/ARM-software/SCP-firmware.git

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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drivers/scmi-msg: support for clock protocol

Adds SCMI clock protocol support in the SCMI message drivers as
defined in SCMI specification v2.0 [1]. Not all the messages
defined in the specification

drivers/scmi-msg: support for clock protocol

Adds SCMI clock protocol support in the SCMI message drivers as
defined in SCMI specification v2.0 [1]. Not all the messages
defined in the specification are supported.

Embedded upon CFG_SCMI_MSG_CLOCK=y.

Platform can provide one of the plat_scmi_clock_*() handler for the
supported operations set/get state/rate and others.

scmi_msg_get_clock_handler() sanitizes the message_id value
against any speculative use of clock ID as a index since by
SCMI specification, IDs are indices.

SCMI resource in this implementation are dumped or inspired by the
SCP-firmware implementation [2] of the SCMI protocol, server side.

Link: [1] http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf
Link: [2] https://github.com/ARM-software/SCP-firmware.git

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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drivers/scmi-msg: driver for processing scmi messages

This change introduces drivers to allow a platform to create a SCMI
service and register handlers for client request (SCMI agent) on
system reso

drivers/scmi-msg: driver for processing scmi messages

This change introduces drivers to allow a platform to create a SCMI
service and register handlers for client request (SCMI agent) on
system resources. This is the first piece of the drivers: an entry
function, the SCMI base protocol support and helpers for create
the response message.

With this change, scmi_process_message() is the entry function to
process an incoming SCMI message. The function expect the message
is already copied from shared memory into secure memory. The message
structure stores message reference and output buffer reference where
response message shall be stored.

scmi_process_message() calls the SCMI protocol driver according to
the protocol ID in the message. The SCMI protocol driver will call
defined platform handlers according to the message content.

This change introduces only the SCMI base protocol as defined in
SCMI specification v2.0 [1]. Not all the messages defined
in the specification are supported.

SCMI resource in this implementation are dumped or inspired by the
SCP-firmware implementation [2] of the SCMI protocol, server side.

Link: [1] http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf
Link: [2] https://github.com/ARM-software/SCP-firmware.git

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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