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/* SPDX-License-Identifier: GPL-2.0-only / / * SCMI Message Protocol driver header * * Copyright (C) 2018 ARM Ltd. / #include <linux/device.h> #include <linux/types.h> #define SCMI_MAX_STR_SIZE 16 #define SCMI_MAX_NUM_RATES 16 /* * 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 { u16 major_ver; u16 minor_ver; u8 num_protocols; u8 num_agents; u32 impl_ver; char vendor_id[SCMI_MAX_STR_SIZE]; char sub_vendor_id[SCMI_MAX_STR_SIZE]; }; struct scmi_clock_info { char name[SCMI_MAX_STR_SIZE]; bool rate_discrete; union { struct { int num_rates; u64 rates[SCMI_MAX_NUM_RATES]; } list; struct { u64 min_rate; u64 max_rate; u64 step_size; } range; }; }; struct scmi_handle; /* * struct scmi_clk_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 / struct scmi_clk_ops { int (count_get)(const struct scmi_handle handle); const struct scmi_clock_info (info_get) (const struct scmi_handle handle, u32 clk_id); int (rate_get)(const struct scmi_handle handle, u32 clk_id, u64 rate); int (rate_set)(const struct scmi_handle handle, u32 clk_id, u64 rate); int (enable)(const struct scmi_handle handle, u32 clk_id); int (disable)(const struct scmi_handle handle, u32 clk_id); }; /* * struct scmi_perf_ops - represents the various operations provided * by SCMI Performance Protocol * * @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 * @device_domain_id: gets the scmi domain id for a given device * @transition_latency_get: gets the DVFS transition latency for a given device * @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 / struct scmi_perf_ops { int (limits_set)(const struct scmi_handle handle, u32 domain, u32 max_perf, u32 min_perf); int (limits_get)(const struct scmi_handle handle, u32 domain, u32 max_perf, u32 min_perf); int (level_set)(const struct scmi_handle handle, u32 domain, u32 level, bool poll); int (level_get)(const struct scmi_handle handle, u32 domain, u32 level, bool poll); int (device_domain_id)(struct device dev); int (transition_latency_get)(const struct scmi_handle handle, struct device dev); int (device_opps_add)(const struct scmi_handle handle, struct device dev); int (freq_set)(const struct scmi_handle handle, u32 domain, unsigned long rate, bool poll); int (freq_get)(const struct scmi_handle handle, u32 domain, unsigned long rate, bool poll); int (est_power_get)(const struct scmi_handle handle, u32 domain, unsigned long rate, unsigned long power); }; /* * struct scmi_power_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_ops { int (num_domains_get)(const struct scmi_handle handle); char (name_get)(const struct scmi_handle handle, u32 domain); #define SCMI_POWER_STATE_TYPE_SHIFT 30 #define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1) #define SCMI_POWER_STATE_PARAM(type, id) \ ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) \| \ ((id) & SCMI_POWER_STATE_ID_MASK)) #define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0) #define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0) int (state_set)(const struct scmi_handle handle, u32 domain, u32 state); int (state_get)(const struct scmi_handle handle, u32 domain, u32 state); }; struct scmi_sensor_info { u32 id; u8 type; s8 scale; u8 num_trip_points; bool async; char name[SCMI_MAX_STR_SIZE]; }; / * Partial list from Distributed Management Task Force (DMTF) specification: * DSP0249 (Platform Level Data Model specification) / enum scmi_sensor_class { NONE = 0x0, TEMPERATURE_C = 0x2, VOLTAGE = 0x5, CURRENT = 0x6, POWER = 0x7, ENERGY = 0x8, }; /* * struct scmi_sensor_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_notify: control notifications on cross-over events for * the trip-points * @trip_point_config: selects and configures a trip-point of interest * @reading_get: gets the current value of the sensor / struct scmi_sensor_ops { int (count_get)(const struct scmi_handle handle); const struct scmi_sensor_info (info_get) (const struct scmi_handle handle, u32 sensor_id); int (trip_point_notify)(const struct scmi_handle handle, u32 sensor_id, bool enable); int (trip_point_config)(const struct scmi_handle handle, u32 sensor_id, u8 trip_id, u64 trip_value); int (reading_get)(const struct scmi_handle handle, u32 sensor_id, u64 value); }; /* * struct scmi_reset_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_ops { int (num_domains_get)(const struct scmi_handle handle); char (name_get)(const struct scmi_handle handle, u32 domain); int (latency_get)(const struct scmi_handle handle, u32 domain); int (reset)(const struct scmi_handle handle, u32 domain); int (assert)(const struct scmi_handle handle, u32 domain); int (deassert)(const struct scmi_handle handle, u32 domain); }; /** * 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 * @power_ops: pointer to set of power protocol operations * @perf_ops: pointer to set of performance protocol operations * @clk_ops: pointer to set of clock protocol operations * @sensor_ops: pointer to set of sensor protocol operations * @reset_ops: pointer to set of reset protocol operations * @perf_priv: pointer to private data structure specific to performance * protocol(for internal use only) * @clk_priv: pointer to private data structure specific to clock * protocol(for internal use only) * @power_priv: pointer to private data structure specific to power * protocol(for internal use only) * @sensor_priv: pointer to private data structure specific to sensors * protocol(for internal use only) * @reset_priv: pointer to private data structure specific to reset * protocol(for internal use only) / struct scmi_handle { struct device dev; struct scmi_revision_info version; struct scmi_perf_ops perf_ops; struct scmi_clk_ops clk_ops; struct scmi_power_ops power_ops; struct scmi_sensor_ops sensor_ops; struct scmi_reset_ops reset_ops; /* for protocol internal use / void perf_priv; void clk_priv; void power_priv; void sensor_priv; void reset_priv; }; enum scmi_std_protocol { SCMI_PROTOCOL_BASE = 0x10, SCMI_PROTOCOL_POWER = 0x11, SCMI_PROTOCOL_SYSTEM = 0x12, SCMI_PROTOCOL_PERF = 0x13, SCMI_PROTOCOL_CLOCK = 0x14, SCMI_PROTOCOL_SENSOR = 0x15, SCMI_PROTOCOL_RESET = 0x16, }; struct scmi_device { u32 id; u8 protocol_id; struct device dev; struct scmi_handle handle; }; #define to_scmi_dev(d) container_of(d, struct scmi_device, dev) struct scmi_device scmi_device_create(struct device_node np, struct device parent, int protocol); void scmi_device_destroy(struct scmi_device scmi_dev); struct scmi_device_id { u8 protocol_id; }; struct scmi_driver { const char name; int (probe)(struct scmi_device sdev); void (remove)(struct scmi_device sdev); const struct scmi_device_id id_table; struct device_driver driver; }; #define to_scmi_driver(d) container_of(d, struct scmi_driver, driver) #ifdef 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) \ scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME) #define scmi_unregister(driver) \ scmi_driver_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_driver(__scmi_driver, scmi_register, scmi_unregister) typedef int (scmi_prot_init_fn_t)(struct scmi_handle *); int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn); void scmi_protocol_unregister(int protocol_id);

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