/* SPDX-License-Identifier: GPL-2.0-only */ /* * SCMI Message Protocol driver header * * Copyright (C) 2018-2021 ARM Ltd. */ #ifndef _LINUX_SCMI_PROTOCOL_H #define _LINUX_SCMI_PROTOCOL_H #include <linux/bitfield.h> #include <linux/device.h> #include <linux/notifier.h> #include <linux/types.h> #define SCMI_MAX_STR_SIZE … #define SCMI_SHORT_NAME_MAX_SIZE … #define SCMI_MAX_NUM_RATES … /** * struct scmi_revision_info - version information structure * * @major_ver: Major ABI version. Change here implies risk of backward * compatibility break. * @minor_ver: Minor ABI version. Change here implies new feature addition, * or compatible change in ABI. * @num_protocols: Number of protocols that are implemented, excluding the * base protocol. * @num_agents: Number of agents in the system. * @impl_ver: A vendor-specific implementation version. * @vendor_id: A vendor identifier(Null terminated ASCII string) * @sub_vendor_id: A sub-vendor identifier(Null terminated ASCII string) */ struct scmi_revision_info { … }; struct scmi_clock_info { … }; enum scmi_power_scale { … }; struct scmi_handle; struct scmi_device; struct scmi_protocol_handle; enum scmi_clock_oem_config { … }; /** * struct scmi_clk_proto_ops - represents the various operations provided * by SCMI Clock Protocol * * @count_get: get the count of clocks provided by SCMI * @info_get: get the information of the specified clock * @rate_get: request the current clock rate of a clock * @rate_set: set the clock rate of a clock * @enable: enables the specified clock * @disable: disables the specified clock * @state_get: get the status of the specified clock * @config_oem_get: get the value of an OEM specific clock config * @config_oem_set: set the value of an OEM specific clock config * @parent_get: get the parent id of a clk * @parent_set: set the parent of a clock */ struct scmi_clk_proto_ops { … }; struct scmi_perf_domain_info { … }; /** * struct scmi_perf_proto_ops - represents the various operations provided * by SCMI Performance Protocol * * @num_domains_get: gets the number of supported performance domains * @info_get: get the information of a performance domain * @limits_set: sets limits on the performance level of a domain * @limits_get: gets limits on the performance level of a domain * @level_set: sets the performance level of a domain * @level_get: gets the performance level of a domain * @transition_latency_get: gets the DVFS transition latency for a given device * @rate_limit_get: gets the minimum time (us) required between successive * requests * @device_opps_add: adds all the OPPs for a given device * @freq_set: sets the frequency for a given device using sustained frequency * to sustained performance level mapping * @freq_get: gets the frequency for a given device using sustained frequency * to sustained performance level mapping * @est_power_get: gets the estimated power cost for a given performance domain * at a given frequency * @fast_switch_possible: indicates if fast DVFS switching is possible or not * for a given device * @fast_switch_rate_limit: gets the minimum time (us) required between * successive fast_switching requests * @power_scale_mw_get: indicates if the power values provided are in milliWatts * or in some other (abstract) scale */ struct scmi_perf_proto_ops { … }; /** * struct scmi_power_proto_ops - represents the various operations provided * by SCMI Power Protocol * * @num_domains_get: get the count of power domains provided by SCMI * @name_get: gets the name of a power domain * @state_set: sets the power state of a power domain * @state_get: gets the power state of a power domain */ struct scmi_power_proto_ops { … }; /** * struct scmi_sensor_reading - represent a timestamped read * * Used by @reading_get_timestamped method. * * @value: The signed value sensor read. * @timestamp: An unsigned timestamp for the sensor read, as provided by * SCMI platform. Set to zero when not available. */ struct scmi_sensor_reading { … }; /** * struct scmi_range_attrs - specifies a sensor or axis values' range * @min_range: The minimum value which can be represented by the sensor/axis. * @max_range: The maximum value which can be represented by the sensor/axis. */ struct scmi_range_attrs { … }; /** * struct scmi_sensor_axis_info - describes one sensor axes * @id: The axes ID. * @type: Axes type. Chosen amongst one of @enum scmi_sensor_class. * @scale: Power-of-10 multiplier applied to the axis unit. * @name: NULL-terminated string representing axes name as advertised by * SCMI platform. * @extended_attrs: Flag to indicate the presence of additional extended * attributes for this axes. * @resolution: Extended attribute representing the resolution of the axes. * Set to 0 if not reported by this axes. * @exponent: Extended attribute representing the power-of-10 multiplier that * is applied to the resolution field. Set to 0 if not reported by * this axes. * @attrs: Extended attributes representing minimum and maximum values * measurable by this axes. Set to 0 if not reported by this sensor. */ struct scmi_sensor_axis_info { … }; /** * struct scmi_sensor_intervals_info - describes number and type of available * update intervals * @segmented: Flag for segmented intervals' representation. When True there * will be exactly 3 intervals in @desc, with each entry * representing a member of a segment in this order: * {lowest update interval, highest update interval, step size} * @count: Number of intervals described in @desc. * @desc: Array of @count interval descriptor bitmask represented as detailed in * the SCMI specification: it can be accessed using the accompanying * macros. * @prealloc_pool: A minimal preallocated pool of desc entries used to avoid * lesser-than-64-bytes dynamic allocation for small @count * values. */ struct scmi_sensor_intervals_info { … }; /** * struct scmi_sensor_info - represents information related to one of the * available sensors. * @id: Sensor ID. * @type: Sensor type. Chosen amongst one of @enum scmi_sensor_class. * @scale: Power-of-10 multiplier applied to the sensor unit. * @num_trip_points: Number of maximum configurable trip points. * @async: Flag for asynchronous read support. * @update: Flag for continuouos update notification support. * @timestamped: Flag for timestamped read support. * @tstamp_scale: Power-of-10 multiplier applied to the sensor timestamps to * represent it in seconds. * @num_axis: Number of supported axis if any. Reported as 0 for scalar sensors. * @axis: Pointer to an array of @num_axis descriptors. * @intervals: Descriptor of available update intervals. * @sensor_config: A bitmask reporting the current sensor configuration as * detailed in the SCMI specification: it can accessed and * modified through the accompanying macros. * @name: NULL-terminated string representing sensor name as advertised by * SCMI platform. * @extended_scalar_attrs: Flag to indicate the presence of additional extended * attributes for this sensor. * @sensor_power: Extended attribute representing the average power * consumed by the sensor in microwatts (uW) when it is active. * Reported here only for scalar sensors. * Set to 0 if not reported by this sensor. * @resolution: Extended attribute representing the resolution of the sensor. * Reported here only for scalar sensors. * Set to 0 if not reported by this sensor. * @exponent: Extended attribute representing the power-of-10 multiplier that is * applied to the resolution field. * Reported here only for scalar sensors. * Set to 0 if not reported by this sensor. * @scalar_attrs: Extended attributes representing minimum and maximum * measurable values by this sensor. * Reported here only for scalar sensors. * Set to 0 if not reported by this sensor. */ struct scmi_sensor_info { … }; /* * Partial list from Distributed Management Task Force (DMTF) specification: * DSP0249 (Platform Level Data Model specification) */ enum scmi_sensor_class { … }; /** * struct scmi_sensor_proto_ops - represents the various operations provided * by SCMI Sensor Protocol * * @count_get: get the count of sensors provided by SCMI * @info_get: get the information of the specified sensor * @trip_point_config: selects and configures a trip-point of interest * @reading_get: gets the current value of the sensor * @reading_get_timestamped: gets the current value and timestamp, when * available, of the sensor. (as of v3.0 spec) * Supports multi-axis sensors for sensors which * supports it and if the @reading array size of * @count entry equals the sensor num_axis * @config_get: Get sensor current configuration * @config_set: Set sensor current configuration */ struct scmi_sensor_proto_ops { … }; /** * struct scmi_reset_proto_ops - represents the various operations provided * by SCMI Reset Protocol * * @num_domains_get: get the count of reset domains provided by SCMI * @name_get: gets the name of a reset domain * @latency_get: gets the reset latency for the specified reset domain * @reset: resets the specified reset domain * @assert: explicitly assert reset signal of the specified reset domain * @deassert: explicitly deassert reset signal of the specified reset domain */ struct scmi_reset_proto_ops { … }; enum scmi_voltage_level_mode { … }; /** * struct scmi_voltage_info - describe one available SCMI Voltage Domain * * @id: the domain ID as advertised by the platform * @segmented: defines the layout of the entries of array @levels_uv. * - when True the entries are to be interpreted as triplets, * each defining a segment representing a range of equally * space voltages: <lowest_volts>, <highest_volt>, <step_uV> * - when False the entries simply represent a single discrete * supported voltage level * @negative_volts_allowed: True if any of the entries of @levels_uv represent * a negative voltage. * @async_level_set: True when the voltage domain supports asynchronous level * set commands. * @name: name assigned to the Voltage Domain by platform * @num_levels: number of total entries in @levels_uv. * @levels_uv: array of entries describing the available voltage levels for * this domain. */ struct scmi_voltage_info { … }; /** * struct scmi_voltage_proto_ops - represents the various operations provided * by SCMI Voltage Protocol * * @num_domains_get: get the count of voltage domains provided by SCMI * @info_get: get the information of the specified domain * @config_set: set the config for the specified domain * @config_get: get the config of the specified domain * @level_set: set the voltage level for the specified domain * @level_get: get the voltage level of the specified domain */ struct scmi_voltage_proto_ops { … }; /** * struct scmi_powercap_info - Describe one available Powercap domain * * @id: Domain ID as advertised by the platform. * @notify_powercap_cap_change: CAP change notification support. * @notify_powercap_measurement_change: MEASUREMENTS change notifications * support. * @async_powercap_cap_set: Asynchronous CAP set support. * @powercap_cap_config: CAP configuration support. * @powercap_monitoring: Monitoring (measurements) support. * @powercap_pai_config: PAI configuration support. * @powercap_scale_mw: Domain reports power data in milliwatt units. * @powercap_scale_uw: Domain reports power data in microwatt units. * Note that, when both @powercap_scale_mw and * @powercap_scale_uw are set to false, the domain * reports power data on an abstract linear scale. * @name: name assigned to the Powercap Domain by platform. * @min_pai: Minimum configurable PAI. * @max_pai: Maximum configurable PAI. * @pai_step: Step size between two consecutive PAI values. * @min_power_cap: Minimum configurable CAP. * @max_power_cap: Maximum configurable CAP. * @power_cap_step: Step size between two consecutive CAP values. * @sustainable_power: Maximum sustainable power consumption for this domain * under normal conditions. * @accuracy: The accuracy with which the power is measured and reported in * integral multiples of 0.001 percent. * @parent_id: Identifier of the containing parent power capping domain, or the * value 0xFFFFFFFF if this powercap domain is a root domain not * contained in any other domain. */ struct scmi_powercap_info { … }; /** * struct scmi_powercap_proto_ops - represents the various operations provided * by SCMI Powercap Protocol * * @num_domains_get: get the count of powercap domains provided by SCMI. * @info_get: get the information for the specified domain. * @cap_get: get the current CAP value for the specified domain. * On SCMI platforms supporting powercap zone disabling, this could * report a zero value for a zone where powercapping is disabled. * @cap_set: set the CAP value for the specified domain to the provided value; * if the domain supports setting the CAP with an asynchronous command * this request will finally trigger an asynchronous transfer, but, if * @ignore_dresp here is set to true, this call will anyway return * immediately without waiting for the related delayed response. * Note that the powercap requested value must NOT be zero, even if * the platform supports disabling a powercap by setting its cap to * zero (since SCMI v3.2): there are dedicated operations that should * be used for that. (@cap_enable_set/get) * @cap_enable_set: enable or disable the powercapping on the specified domain, * if supported by the SCMI platform implementation. * Note that, by the SCMI specification, the platform can * silently ignore our disable request and decide to enforce * anyway some other powercap value requested by another agent * on the system: for this reason @cap_get and @cap_enable_get * will always report the final platform view of the powercaps. * @cap_enable_get: get the current CAP enable status for the specified domain. * @pai_get: get the current PAI value for the specified domain. * @pai_set: set the PAI value for the specified domain to the provided value. * @measurements_get: retrieve the current average power measurements for the * specified domain and the related PAI upon which is * calculated. * @measurements_threshold_set: set the desired low and high power thresholds * to be used when registering for notification * of type POWERCAP_MEASUREMENTS_NOTIFY with this * powercap domain. * Note that this must be called at least once * before registering any callback with the usual * @scmi_notify_ops; moreover, in case this method * is called with measurement notifications already * enabled it will also trigger, transparently, a * proper update of the power thresholds configured * in the SCMI backend server. * @measurements_threshold_get: get the currently configured low and high power * thresholds used when registering callbacks for * notification POWERCAP_MEASUREMENTS_NOTIFY. */ struct scmi_powercap_proto_ops { … }; enum scmi_pinctrl_selector_type { … }; enum scmi_pinctrl_conf_type { … }; /** * struct scmi_pinctrl_proto_ops - represents the various operations provided * by SCMI Pinctrl Protocol * * @count_get: returns count of the registered elements in given type * @name_get: returns name by index of given type * @group_pins_get: returns the set of pins, assigned to the specified group * @function_groups_get: returns the set of groups, assigned to the specified * function * @mux_set: set muxing function for groups of pins * @settings_get_one: returns one configuration parameter for pin or group * specified by config_type * @settings_get_all: returns all configuration parameters for pin or group * @settings_conf: sets the configuration parameter for pin or group * @pin_request: aquire pin before selecting mux setting * @pin_free: frees pin, acquired by request_pin call */ struct scmi_pinctrl_proto_ops { … }; /** * struct scmi_notify_ops - represents notifications' operations provided by * SCMI core * @devm_event_notifier_register: Managed registration of a notifier_block for * the requested event * @devm_event_notifier_unregister: Managed unregistration of a notifier_block * for the requested event * @event_notifier_register: Register a notifier_block for the requested event * @event_notifier_unregister: Unregister a notifier_block for the requested * event * * A user can register/unregister its own notifier_block against the wanted * platform instance regarding the desired event identified by the * tuple: (proto_id, evt_id, src_id) using the provided register/unregister * interface where: * * @sdev: The scmi_device to use when calling the devres managed ops devm_ * @handle: The handle identifying the platform instance to use, when not * calling the managed ops devm_ * @proto_id: The protocol ID as in SCMI Specification * @evt_id: The message ID of the desired event as in SCMI Specification * @src_id: A pointer to the desired source ID if different sources are * possible for the protocol (like domain_id, sensor_id...etc) * * @src_id can be provided as NULL if it simply does NOT make sense for * the protocol at hand, OR if the user is explicitly interested in * receiving notifications from ANY existent source associated to the * specified proto_id / evt_id. * * Received notifications are finally delivered to the registered users, * invoking the callback provided with the notifier_block *nb as follows: * * int user_cb(nb, evt_id, report) * * with: * * @nb: The notifier block provided by the user * @evt_id: The message ID of the delivered event * @report: A custom struct describing the specific event delivered */ struct scmi_notify_ops { … }; /** * struct scmi_handle - Handle returned to ARM SCMI clients for usage. * * @dev: pointer to the SCMI device * @version: pointer to the structure containing SCMI version information * @devm_protocol_acquire: devres managed method to get hold of a protocol, * causing its initialization and related resource * accounting * @devm_protocol_get: devres managed method to acquire a protocol and get specific * operations and a dedicated protocol handler * @devm_protocol_put: devres managed method to release a protocol * @is_transport_atomic: method to check if the underlying transport for this * instance handle is configured to support atomic * transactions for commands. * Some users of the SCMI stack in the upper layers could * be interested to know if they can assume SCMI * command transactions associated to this handle will * never sleep and act accordingly. * An optional atomic threshold value could be returned * where configured. * @notify_ops: pointer to set of notifications related operations */ struct scmi_handle { … }; enum scmi_std_protocol { … }; enum scmi_system_events { … }; struct scmi_device { … }; #define to_scmi_dev(d) … struct scmi_device_id { … }; struct scmi_driver { … }; #define to_scmi_driver(d) … #if IS_REACHABLE(CONFIG_ARM_SCMI_PROTOCOL) int scmi_driver_register(struct scmi_driver *driver, struct module *owner, const char *mod_name); void scmi_driver_unregister(struct scmi_driver *driver); #else static inline int scmi_driver_register(struct scmi_driver *driver, struct module *owner, const char *mod_name) { return -EINVAL; } static inline void scmi_driver_unregister(struct scmi_driver *driver) {} #endif /* CONFIG_ARM_SCMI_PROTOCOL */ #define scmi_register(driver) … #define scmi_unregister(driver) … /** * module_scmi_driver() - Helper macro for registering a scmi driver * @__scmi_driver: scmi_driver structure * * Helper macro for scmi drivers to set up proper module init / exit * functions. Replaces module_init() and module_exit() and keeps people from * printing pointless things to the kernel log when their driver is loaded. */ #define module_scmi_driver(__scmi_driver) … /** * module_scmi_protocol() - Helper macro for registering a scmi protocol * @__scmi_protocol: scmi_protocol structure * * Helper macro for scmi drivers to set up proper module init / exit * functions. Replaces module_init() and module_exit() and keeps people from * printing pointless things to the kernel log when their driver is loaded. */ #define module_scmi_protocol(__scmi_protocol) … struct scmi_protocol; int scmi_protocol_register(const struct scmi_protocol *proto); void scmi_protocol_unregister(const struct scmi_protocol *proto); /* SCMI Notification API - Custom Event Reports */ enum scmi_notification_events { … }; struct scmi_power_state_changed_report { … }; struct scmi_clock_rate_notif_report { … }; struct scmi_system_power_state_notifier_report { … }; struct scmi_perf_limits_report { … }; struct scmi_perf_level_report { … }; struct scmi_sensor_trip_point_report { … }; struct scmi_sensor_update_report { … }; struct scmi_reset_issued_report { … }; struct scmi_base_error_report { … }; struct scmi_powercap_cap_changed_report { … }; struct scmi_powercap_meas_changed_report { … }; #endif /* _LINUX_SCMI_PROTOCOL_H */
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