/* 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               64
#define SCMI_SHORT_NAME_MAX_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_SHORT_NAME_MAX_SIZE];
        char sub_vendor_id[SCMI_SHORT_NAME_MAX_SIZE];
};

struct scmi_clock_info {
        char name[SCMI_MAX_STR_SIZE];
        unsigned int enable_latency;
        bool rate_discrete;
        bool rate_changed_notifications;
        bool rate_change_requested_notifications;
        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_device;
struct scmi_protocol_handle;

/**
 * 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
 */
struct scmi_clk_proto_ops {
        int (*count_get)(const struct scmi_protocol_handle *ph);

        const struct scmi_clock_info *(*info_get)
                (const struct scmi_protocol_handle *ph, u32 clk_id);
        int (*rate_get)(const struct scmi_protocol_handle *ph, u32 clk_id,
                        u64 *rate);
        int (*rate_set)(const struct scmi_protocol_handle *ph, u32 clk_id,
                        u64 rate);
        int (*enable)(const struct scmi_protocol_handle *ph, u32 clk_id);
        int (*disable)(const struct scmi_protocol_handle *ph, u32 clk_id);
        int (*enable_atomic)(const struct scmi_protocol_handle *ph, u32 clk_id);
        int (*disable_atomic)(const struct scmi_protocol_handle *ph,
                              u32 clk_id);
};

/**
 * struct scmi_perf_proto_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
 * @fast_switch_possible: indicates if fast DVFS switching is possible or not
 *      for a given device
 * @power_scale_mw_get: indicates if the power values provided are in milliWatts
 *      or in some other (abstract) scale
 */
struct scmi_perf_proto_ops {
        int (*limits_set)(const struct scmi_protocol_handle *ph, u32 domain,
                          u32 max_perf, u32 min_perf);
        int (*limits_get)(const struct scmi_protocol_handle *ph, u32 domain,
                          u32 *max_perf, u32 *min_perf);
        int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain,
                         u32 level, bool poll);
        int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain,
                         u32 *level, bool poll);
        int (*device_domain_id)(struct device *dev);
        int (*transition_latency_get)(const struct scmi_protocol_handle *ph,
                                      struct device *dev);
        int (*device_opps_add)(const struct scmi_protocol_handle *ph,
                               struct device *dev);
        int (*freq_set)(const struct scmi_protocol_handle *ph, u32 domain,
                        unsigned long rate, bool poll);
        int (*freq_get)(const struct scmi_protocol_handle *ph, u32 domain,
                        unsigned long *rate, bool poll);
        int (*est_power_get)(const struct scmi_protocol_handle *ph, u32 domain,
                             unsigned long *rate, unsigned long *power);
        bool (*fast_switch_possible)(const struct scmi_protocol_handle *ph,
                                     struct device *dev);
        bool (*power_scale_mw_get)(const struct scmi_protocol_handle *ph);
};

/**
 * 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 {
        int (*num_domains_get)(const struct scmi_protocol_handle *ph);
        const char *(*name_get)(const struct scmi_protocol_handle *ph,
                                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_protocol_handle *ph, u32 domain,
                         u32 state);
        int (*state_get)(const struct scmi_protocol_handle *ph, u32 domain,
                         u32 *state);
};

/**
 * 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 {
        long long value;
        unsigned long long timestamp;
};

/**
 * 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 {
        long long min_range;
        long long max_range;
};

/**
 * 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 {
        unsigned int id;
        unsigned int type;
        int scale;
        char name[SCMI_MAX_STR_SIZE];
        bool extended_attrs;
        unsigned int resolution;
        int exponent;
        struct scmi_range_attrs attrs;
};

/**
 * 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 {
        bool segmented;
        unsigned int count;
#define SCMI_SENS_INTVL_SEGMENT_LOW     0
#define SCMI_SENS_INTVL_SEGMENT_HIGH    1
#define SCMI_SENS_INTVL_SEGMENT_STEP    2
        unsigned int *desc;
#define SCMI_SENS_INTVL_GET_SECS(x)             FIELD_GET(GENMASK(20, 5), (x))
#define SCMI_SENS_INTVL_GET_EXP(x)                                      \
        ({                                                              \
                int __signed_exp = FIELD_GET(GENMASK(4, 0), (x));       \
                                                                        \
                if (__signed_exp & BIT(4))                              \
                        __signed_exp |= GENMASK(31, 5);                 \
                __signed_exp;                                           \
        })
#define SCMI_MAX_PREALLOC_POOL                  16
        unsigned int prealloc_pool[SCMI_MAX_PREALLOC_POOL];
};

/**
 * 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 {
        unsigned int id;
        unsigned int type;
        int scale;
        unsigned int num_trip_points;
        bool async;
        bool update;
        bool timestamped;
        int tstamp_scale;
        unsigned int num_axis;
        struct scmi_sensor_axis_info *axis;
        struct scmi_sensor_intervals_info intervals;
        unsigned int sensor_config;
#define SCMI_SENS_CFG_UPDATE_SECS_MASK          GENMASK(31, 16)
#define SCMI_SENS_CFG_GET_UPDATE_SECS(x)                                \
        FIELD_GET(SCMI_SENS_CFG_UPDATE_SECS_MASK, (x))

#define SCMI_SENS_CFG_UPDATE_EXP_MASK           GENMASK(15, 11)
#define SCMI_SENS_CFG_GET_UPDATE_EXP(x)                                 \
        ({                                                              \
                int __signed_exp =                                      \
                        FIELD_GET(SCMI_SENS_CFG_UPDATE_EXP_MASK, (x));  \
                                                                        \
                if (__signed_exp & BIT(4))                              \
                        __signed_exp |= GENMASK(31, 5);                 \
                __signed_exp;                                           \
        })

#define SCMI_SENS_CFG_ROUND_MASK                GENMASK(10, 9)
#define SCMI_SENS_CFG_ROUND_AUTO                2
#define SCMI_SENS_CFG_ROUND_UP                  1
#define SCMI_SENS_CFG_ROUND_DOWN                0

#define SCMI_SENS_CFG_TSTAMP_ENABLED_MASK       BIT(1)
#define SCMI_SENS_CFG_TSTAMP_ENABLE             1
#define SCMI_SENS_CFG_TSTAMP_DISABLE            0
#define SCMI_SENS_CFG_IS_TSTAMP_ENABLED(x)                              \
        FIELD_GET(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, (x))

#define SCMI_SENS_CFG_SENSOR_ENABLED_MASK       BIT(0)
#define SCMI_SENS_CFG_SENSOR_ENABLE             1
#define SCMI_SENS_CFG_SENSOR_DISABLE            0
        char name[SCMI_MAX_STR_SIZE];
#define SCMI_SENS_CFG_IS_ENABLED(x)             FIELD_GET(BIT(0), (x))
        bool extended_scalar_attrs;
        unsigned int sensor_power;
        unsigned int resolution;
        int exponent;
        struct scmi_range_attrs scalar_attrs;
};

/*
 * Partial list from Distributed Management Task Force (DMTF) specification:
 * DSP0249 (Platform Level Data Model specification)
 */
enum scmi_sensor_class {
        NONE = 0x0,
        UNSPEC = 0x1,
        TEMPERATURE_C = 0x2,
        TEMPERATURE_F = 0x3,
        TEMPERATURE_K = 0x4,
        VOLTAGE = 0x5,
        CURRENT = 0x6,
        POWER = 0x7,
        ENERGY = 0x8,
        CHARGE = 0x9,
        VOLTAMPERE = 0xA,
        NITS = 0xB,
        LUMENS = 0xC,
        LUX = 0xD,
        CANDELAS = 0xE,
        KPA = 0xF,
        PSI = 0x10,
        NEWTON = 0x11,
        CFM = 0x12,
        RPM = 0x13,
        HERTZ = 0x14,
        SECS = 0x15,
        MINS = 0x16,
        HOURS = 0x17,
        DAYS = 0x18,
        WEEKS = 0x19,
        MILS = 0x1A,
        INCHES = 0x1B,
        FEET = 0x1C,
        CUBIC_INCHES = 0x1D,
        CUBIC_FEET = 0x1E,
        METERS = 0x1F,
        CUBIC_CM = 0x20,
        CUBIC_METERS = 0x21,
        LITERS = 0x22,
        FLUID_OUNCES = 0x23,
        RADIANS = 0x24,
        STERADIANS = 0x25,
        REVOLUTIONS = 0x26,
        CYCLES = 0x27,
        GRAVITIES = 0x28,
        OUNCES = 0x29,
        POUNDS = 0x2A,
        FOOT_POUNDS = 0x2B,
        OUNCE_INCHES = 0x2C,
        GAUSS = 0x2D,
        GILBERTS = 0x2E,
        HENRIES = 0x2F,
        FARADS = 0x30,
        OHMS = 0x31,
        SIEMENS = 0x32,
        MOLES = 0x33,
        BECQUERELS = 0x34,
        PPM = 0x35,
        DECIBELS = 0x36,
        DBA = 0x37,
        DBC = 0x38,
        GRAYS = 0x39,
        SIEVERTS = 0x3A,
        COLOR_TEMP_K = 0x3B,
        BITS = 0x3C,
        BYTES = 0x3D,
        WORDS = 0x3E,
        DWORDS = 0x3F,
        QWORDS = 0x40,
        PERCENTAGE = 0x41,
        PASCALS = 0x42,
        COUNTS = 0x43,
        GRAMS = 0x44,
        NEWTON_METERS = 0x45,
        HITS = 0x46,
        MISSES = 0x47,
        RETRIES = 0x48,
        OVERRUNS = 0x49,
        UNDERRUNS = 0x4A,
        COLLISIONS = 0x4B,
        PACKETS = 0x4C,
        MESSAGES = 0x4D,
        CHARS = 0x4E,
        ERRORS = 0x4F,
        CORRECTED_ERRS = 0x50,
        UNCORRECTABLE_ERRS = 0x51,
        SQ_MILS = 0x52,
        SQ_INCHES = 0x53,
        SQ_FEET = 0x54,
        SQ_CM = 0x55,
        SQ_METERS = 0x56,
        RADIANS_SEC = 0x57,
        BPM = 0x58,
        METERS_SEC_SQUARED = 0x59,
        METERS_SEC = 0x5A,
        CUBIC_METERS_SEC = 0x5B,
        MM_MERCURY = 0x5C,
        RADIANS_SEC_SQUARED = 0x5D,
        OEM_UNIT = 0xFF
};

/**
 * 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 {
        int (*count_get)(const struct scmi_protocol_handle *ph);
        const struct scmi_sensor_info *(*info_get)
                (const struct scmi_protocol_handle *ph, u32 sensor_id);
        int (*trip_point_config)(const struct scmi_protocol_handle *ph,
                                 u32 sensor_id, u8 trip_id, u64 trip_value);
        int (*reading_get)(const struct scmi_protocol_handle *ph, u32 sensor_id,
                           u64 *value);
        int (*reading_get_timestamped)(const struct scmi_protocol_handle *ph,
                                       u32 sensor_id, u8 count,
                                       struct scmi_sensor_reading *readings);
        int (*config_get)(const struct scmi_protocol_handle *ph,
                          u32 sensor_id, u32 *sensor_config);
        int (*config_set)(const struct scmi_protocol_handle *ph,
                          u32 sensor_id, u32 sensor_config);
};

/**
 * 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 {
        int (*num_domains_get)(const struct scmi_protocol_handle *ph);
        const char *(*name_get)(const struct scmi_protocol_handle *ph,
                                u32 domain);
        int (*latency_get)(const struct scmi_protocol_handle *ph, u32 domain);
        int (*reset)(const struct scmi_protocol_handle *ph, u32 domain);
        int (*assert)(const struct scmi_protocol_handle *ph, u32 domain);
        int (*deassert)(const struct scmi_protocol_handle *ph, u32 domain);
};

enum scmi_voltage_level_mode {
        SCMI_VOLTAGE_LEVEL_SET_AUTO,
        SCMI_VOLTAGE_LEVEL_SET_SYNC,
};

/**
 * 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 {
        unsigned int id;
        bool segmented;
        bool negative_volts_allowed;
        bool async_level_set;
        char name[SCMI_MAX_STR_SIZE];
        unsigned int num_levels;
#define SCMI_VOLTAGE_SEGMENT_LOW        0
#define SCMI_VOLTAGE_SEGMENT_HIGH       1
#define SCMI_VOLTAGE_SEGMENT_STEP       2
        int *levels_uv;
};

/**
 * 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 {
        int (*num_domains_get)(const struct scmi_protocol_handle *ph);
        const struct scmi_voltage_info __must_check *(*info_get)
                (const struct scmi_protocol_handle *ph, u32 domain_id);
        int (*config_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
                          u32 config);
#define SCMI_VOLTAGE_ARCH_STATE_OFF             0x0
#define SCMI_VOLTAGE_ARCH_STATE_ON              0x7
        int (*config_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
                          u32 *config);
        int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
                         enum scmi_voltage_level_mode mode, s32 volt_uV);
        int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
                         s32 *volt_uV);
};

/**
 * 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 {
        int (*devm_event_notifier_register)(struct scmi_device *sdev,
                                            u8 proto_id, u8 evt_id,
                                            const u32 *src_id,
                                            struct notifier_block *nb);
        int (*devm_event_notifier_unregister)(struct scmi_device *sdev,
                                              u8 proto_id, u8 evt_id,
                                              const u32 *src_id,
                                              struct notifier_block *nb);
        int (*event_notifier_register)(const struct scmi_handle *handle,
                                       u8 proto_id, u8 evt_id,
                                       const u32 *src_id,
                                       struct notifier_block *nb);
        int (*event_notifier_unregister)(const struct scmi_handle *handle,
                                         u8 proto_id, u8 evt_id,
                                         const u32 *src_id,
                                         struct notifier_block *nb);
};

/**
 * 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_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 {
        struct device *dev;
        struct scmi_revision_info *version;

        const void __must_check *
                (*devm_protocol_get)(struct scmi_device *sdev, u8 proto,
                                     struct scmi_protocol_handle **ph);
        void (*devm_protocol_put)(struct scmi_device *sdev, u8 proto);
        bool (*is_transport_atomic)(const struct scmi_handle *handle,
                                    unsigned int *atomic_threshold);

        const struct scmi_notify_ops *notify_ops;
};

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,
        SCMI_PROTOCOL_VOLTAGE = 0x17,
};

enum scmi_system_events {
        SCMI_SYSTEM_SHUTDOWN,
        SCMI_SYSTEM_COLDRESET,
        SCMI_SYSTEM_WARMRESET,
        SCMI_SYSTEM_POWERUP,
        SCMI_SYSTEM_SUSPEND,
        SCMI_SYSTEM_MAX
};

struct scmi_device {
        u32 id;
        u8 protocol_id;
        const char *name;
        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,
                   const char *name);
void scmi_device_destroy(struct scmi_device *scmi_dev);

struct scmi_device_id {
        u8 protocol_id;
        const char *name;
};

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)

#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) \
        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)

/**
 * 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)   \
        module_driver(__scmi_protocol,          \
                      scmi_protocol_register, scmi_protocol_unregister)

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 {
        SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
        SCMI_EVENT_CLOCK_RATE_CHANGED = 0x0,
        SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED = 0x1,
        SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
        SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
        SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
        SCMI_EVENT_SENSOR_UPDATE = 0x1,
        SCMI_EVENT_RESET_ISSUED = 0x0,
        SCMI_EVENT_BASE_ERROR_EVENT = 0x0,
        SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER = 0x0,
};

struct scmi_power_state_changed_report {
        ktime_t         timestamp;
        unsigned int    agent_id;
        unsigned int    domain_id;
        unsigned int    power_state;
};

struct scmi_clock_rate_notif_report {
        ktime_t                 timestamp;
        unsigned int            agent_id;
        unsigned int            clock_id;
        unsigned long long      rate;
};

struct scmi_system_power_state_notifier_report {
        ktime_t         timestamp;
        unsigned int    agent_id;
        unsigned int    flags;
        unsigned int    system_state;
};

struct scmi_perf_limits_report {
        ktime_t         timestamp;
        unsigned int    agent_id;
        unsigned int    domain_id;
        unsigned int    range_max;
        unsigned int    range_min;
};

struct scmi_perf_level_report {
        ktime_t         timestamp;
        unsigned int    agent_id;
        unsigned int    domain_id;
        unsigned int    performance_level;
};

struct scmi_sensor_trip_point_report {
        ktime_t         timestamp;
        unsigned int    agent_id;
        unsigned int    sensor_id;
        unsigned int    trip_point_desc;
};

struct scmi_sensor_update_report {
        ktime_t                         timestamp;
        unsigned int                    agent_id;
        unsigned int                    sensor_id;
        unsigned int                    readings_count;
        struct scmi_sensor_reading      readings[];
};

struct scmi_reset_issued_report {
        ktime_t         timestamp;
        unsigned int    agent_id;
        unsigned int    domain_id;
        unsigned int    reset_state;
};

struct scmi_base_error_report {
        ktime_t                 timestamp;
        unsigned int            agent_id;
        bool                    fatal;
        unsigned int            cmd_count;
        unsigned long long      reports[];
};

#endif /* _LINUX_SCMI_PROTOCOL_H */