1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * SCMI Message Protocol driver header
5 * Copyright (C) 2018-2021 ARM Ltd.
8 #ifndef _LINUX_SCMI_PROTOCOL_H
9 #define _LINUX_SCMI_PROTOCOL_H
11 #include <linux/bitfield.h>
12 #include <linux/device.h>
13 #include <linux/notifier.h>
14 #include <linux/types.h>
16 #define SCMI_MAX_STR_SIZE 64
17 #define SCMI_SHORT_NAME_MAX_SIZE 16
18 #define SCMI_MAX_NUM_RATES 16
21 * struct scmi_revision_info - version information structure
23 * @major_ver: Major ABI version. Change here implies risk of backward
24 * compatibility break.
25 * @minor_ver: Minor ABI version. Change here implies new feature addition,
26 * or compatible change in ABI.
27 * @num_protocols: Number of protocols that are implemented, excluding the
29 * @num_agents: Number of agents in the system.
30 * @impl_ver: A vendor-specific implementation version.
31 * @vendor_id: A vendor identifier(Null terminated ASCII string)
32 * @sub_vendor_id: A sub-vendor identifier(Null terminated ASCII string)
34 struct scmi_revision_info {
40 char vendor_id[SCMI_SHORT_NAME_MAX_SIZE];
41 char sub_vendor_id[SCMI_SHORT_NAME_MAX_SIZE];
44 struct scmi_clock_info {
45 char name[SCMI_MAX_STR_SIZE];
46 unsigned int enable_latency;
48 bool rate_changed_notifications;
49 bool rate_change_requested_notifications;
53 u64 rates[SCMI_MAX_NUM_RATES];
63 enum scmi_power_scale {
65 SCMI_POWER_MILLIWATTS,
71 struct scmi_protocol_handle;
74 * struct scmi_clk_proto_ops - represents the various operations provided
75 * by SCMI Clock Protocol
77 * @count_get: get the count of clocks provided by SCMI
78 * @info_get: get the information of the specified clock
79 * @rate_get: request the current clock rate of a clock
80 * @rate_set: set the clock rate of a clock
81 * @enable: enables the specified clock
82 * @disable: disables the specified clock
84 struct scmi_clk_proto_ops {
85 int (*count_get)(const struct scmi_protocol_handle *ph);
87 const struct scmi_clock_info __must_check *(*info_get)
88 (const struct scmi_protocol_handle *ph, u32 clk_id);
89 int (*rate_get)(const struct scmi_protocol_handle *ph, u32 clk_id,
91 int (*rate_set)(const struct scmi_protocol_handle *ph, u32 clk_id,
93 int (*enable)(const struct scmi_protocol_handle *ph, u32 clk_id);
94 int (*disable)(const struct scmi_protocol_handle *ph, u32 clk_id);
95 int (*enable_atomic)(const struct scmi_protocol_handle *ph, u32 clk_id);
96 int (*disable_atomic)(const struct scmi_protocol_handle *ph,
101 * struct scmi_perf_proto_ops - represents the various operations provided
102 * by SCMI Performance Protocol
104 * @num_domains_get: gets the number of supported performance domains
105 * @limits_set: sets limits on the performance level of a domain
106 * @limits_get: gets limits on the performance level of a domain
107 * @level_set: sets the performance level of a domain
108 * @level_get: gets the performance level of a domain
109 * @device_domain_id: gets the scmi domain id for a given device
110 * @transition_latency_get: gets the DVFS transition latency for a given device
111 * @device_opps_add: adds all the OPPs for a given device
112 * @freq_set: sets the frequency for a given device using sustained frequency
113 * to sustained performance level mapping
114 * @freq_get: gets the frequency for a given device using sustained frequency
115 * to sustained performance level mapping
116 * @est_power_get: gets the estimated power cost for a given performance domain
117 * at a given frequency
118 * @fast_switch_possible: indicates if fast DVFS switching is possible or not
120 * @power_scale_mw_get: indicates if the power values provided are in milliWatts
121 * or in some other (abstract) scale
123 struct scmi_perf_proto_ops {
124 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
125 int (*limits_set)(const struct scmi_protocol_handle *ph, u32 domain,
126 u32 max_perf, u32 min_perf);
127 int (*limits_get)(const struct scmi_protocol_handle *ph, u32 domain,
128 u32 *max_perf, u32 *min_perf);
129 int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain,
130 u32 level, bool poll);
131 int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain,
132 u32 *level, bool poll);
133 int (*device_domain_id)(struct device *dev);
134 int (*transition_latency_get)(const struct scmi_protocol_handle *ph,
136 int (*device_opps_add)(const struct scmi_protocol_handle *ph,
138 int (*freq_set)(const struct scmi_protocol_handle *ph, u32 domain,
139 unsigned long rate, bool poll);
140 int (*freq_get)(const struct scmi_protocol_handle *ph, u32 domain,
141 unsigned long *rate, bool poll);
142 int (*est_power_get)(const struct scmi_protocol_handle *ph, u32 domain,
143 unsigned long *rate, unsigned long *power);
144 bool (*fast_switch_possible)(const struct scmi_protocol_handle *ph,
146 enum scmi_power_scale (*power_scale_get)(const struct scmi_protocol_handle *ph);
150 * struct scmi_power_proto_ops - represents the various operations provided
151 * by SCMI Power Protocol
153 * @num_domains_get: get the count of power domains provided by SCMI
154 * @name_get: gets the name of a power domain
155 * @state_set: sets the power state of a power domain
156 * @state_get: gets the power state of a power domain
158 struct scmi_power_proto_ops {
159 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
160 const char *(*name_get)(const struct scmi_protocol_handle *ph,
162 #define SCMI_POWER_STATE_TYPE_SHIFT 30
163 #define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1)
164 #define SCMI_POWER_STATE_PARAM(type, id) \
165 ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \
166 ((id) & SCMI_POWER_STATE_ID_MASK))
167 #define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0)
168 #define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0)
169 int (*state_set)(const struct scmi_protocol_handle *ph, u32 domain,
171 int (*state_get)(const struct scmi_protocol_handle *ph, u32 domain,
176 * struct scmi_sensor_reading - represent a timestamped read
178 * Used by @reading_get_timestamped method.
180 * @value: The signed value sensor read.
181 * @timestamp: An unsigned timestamp for the sensor read, as provided by
182 * SCMI platform. Set to zero when not available.
184 struct scmi_sensor_reading {
186 unsigned long long timestamp;
190 * struct scmi_range_attrs - specifies a sensor or axis values' range
191 * @min_range: The minimum value which can be represented by the sensor/axis.
192 * @max_range: The maximum value which can be represented by the sensor/axis.
194 struct scmi_range_attrs {
200 * struct scmi_sensor_axis_info - describes one sensor axes
202 * @type: Axes type. Chosen amongst one of @enum scmi_sensor_class.
203 * @scale: Power-of-10 multiplier applied to the axis unit.
204 * @name: NULL-terminated string representing axes name as advertised by
206 * @extended_attrs: Flag to indicate the presence of additional extended
207 * attributes for this axes.
208 * @resolution: Extended attribute representing the resolution of the axes.
209 * Set to 0 if not reported by this axes.
210 * @exponent: Extended attribute representing the power-of-10 multiplier that
211 * is applied to the resolution field. Set to 0 if not reported by
213 * @attrs: Extended attributes representing minimum and maximum values
214 * measurable by this axes. Set to 0 if not reported by this sensor.
216 struct scmi_sensor_axis_info {
220 char name[SCMI_MAX_STR_SIZE];
222 unsigned int resolution;
224 struct scmi_range_attrs attrs;
228 * struct scmi_sensor_intervals_info - describes number and type of available
230 * @segmented: Flag for segmented intervals' representation. When True there
231 * will be exactly 3 intervals in @desc, with each entry
232 * representing a member of a segment in this order:
233 * {lowest update interval, highest update interval, step size}
234 * @count: Number of intervals described in @desc.
235 * @desc: Array of @count interval descriptor bitmask represented as detailed in
236 * the SCMI specification: it can be accessed using the accompanying
238 * @prealloc_pool: A minimal preallocated pool of desc entries used to avoid
239 * lesser-than-64-bytes dynamic allocation for small @count
242 struct scmi_sensor_intervals_info {
245 #define SCMI_SENS_INTVL_SEGMENT_LOW 0
246 #define SCMI_SENS_INTVL_SEGMENT_HIGH 1
247 #define SCMI_SENS_INTVL_SEGMENT_STEP 2
249 #define SCMI_SENS_INTVL_GET_SECS(x) FIELD_GET(GENMASK(20, 5), (x))
250 #define SCMI_SENS_INTVL_GET_EXP(x) \
252 int __signed_exp = FIELD_GET(GENMASK(4, 0), (x)); \
254 if (__signed_exp & BIT(4)) \
255 __signed_exp |= GENMASK(31, 5); \
258 #define SCMI_MAX_PREALLOC_POOL 16
259 unsigned int prealloc_pool[SCMI_MAX_PREALLOC_POOL];
263 * struct scmi_sensor_info - represents information related to one of the
266 * @type: Sensor type. Chosen amongst one of @enum scmi_sensor_class.
267 * @scale: Power-of-10 multiplier applied to the sensor unit.
268 * @num_trip_points: Number of maximum configurable trip points.
269 * @async: Flag for asynchronous read support.
270 * @update: Flag for continuouos update notification support.
271 * @timestamped: Flag for timestamped read support.
272 * @tstamp_scale: Power-of-10 multiplier applied to the sensor timestamps to
273 * represent it in seconds.
274 * @num_axis: Number of supported axis if any. Reported as 0 for scalar sensors.
275 * @axis: Pointer to an array of @num_axis descriptors.
276 * @intervals: Descriptor of available update intervals.
277 * @sensor_config: A bitmask reporting the current sensor configuration as
278 * detailed in the SCMI specification: it can accessed and
279 * modified through the accompanying macros.
280 * @name: NULL-terminated string representing sensor name as advertised by
282 * @extended_scalar_attrs: Flag to indicate the presence of additional extended
283 * attributes for this sensor.
284 * @sensor_power: Extended attribute representing the average power
285 * consumed by the sensor in microwatts (uW) when it is active.
286 * Reported here only for scalar sensors.
287 * Set to 0 if not reported by this sensor.
288 * @resolution: Extended attribute representing the resolution of the sensor.
289 * Reported here only for scalar sensors.
290 * Set to 0 if not reported by this sensor.
291 * @exponent: Extended attribute representing the power-of-10 multiplier that is
292 * applied to the resolution field.
293 * Reported here only for scalar sensors.
294 * Set to 0 if not reported by this sensor.
295 * @scalar_attrs: Extended attributes representing minimum and maximum
296 * measurable values by this sensor.
297 * Reported here only for scalar sensors.
298 * Set to 0 if not reported by this sensor.
300 struct scmi_sensor_info {
304 unsigned int num_trip_points;
309 unsigned int num_axis;
310 struct scmi_sensor_axis_info *axis;
311 struct scmi_sensor_intervals_info intervals;
312 unsigned int sensor_config;
313 #define SCMI_SENS_CFG_UPDATE_SECS_MASK GENMASK(31, 16)
314 #define SCMI_SENS_CFG_GET_UPDATE_SECS(x) \
315 FIELD_GET(SCMI_SENS_CFG_UPDATE_SECS_MASK, (x))
317 #define SCMI_SENS_CFG_UPDATE_EXP_MASK GENMASK(15, 11)
318 #define SCMI_SENS_CFG_GET_UPDATE_EXP(x) \
321 FIELD_GET(SCMI_SENS_CFG_UPDATE_EXP_MASK, (x)); \
323 if (__signed_exp & BIT(4)) \
324 __signed_exp |= GENMASK(31, 5); \
328 #define SCMI_SENS_CFG_ROUND_MASK GENMASK(10, 9)
329 #define SCMI_SENS_CFG_ROUND_AUTO 2
330 #define SCMI_SENS_CFG_ROUND_UP 1
331 #define SCMI_SENS_CFG_ROUND_DOWN 0
333 #define SCMI_SENS_CFG_TSTAMP_ENABLED_MASK BIT(1)
334 #define SCMI_SENS_CFG_TSTAMP_ENABLE 1
335 #define SCMI_SENS_CFG_TSTAMP_DISABLE 0
336 #define SCMI_SENS_CFG_IS_TSTAMP_ENABLED(x) \
337 FIELD_GET(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, (x))
339 #define SCMI_SENS_CFG_SENSOR_ENABLED_MASK BIT(0)
340 #define SCMI_SENS_CFG_SENSOR_ENABLE 1
341 #define SCMI_SENS_CFG_SENSOR_DISABLE 0
342 char name[SCMI_MAX_STR_SIZE];
343 #define SCMI_SENS_CFG_IS_ENABLED(x) FIELD_GET(BIT(0), (x))
344 bool extended_scalar_attrs;
345 unsigned int sensor_power;
346 unsigned int resolution;
348 struct scmi_range_attrs scalar_attrs;
352 * Partial list from Distributed Management Task Force (DMTF) specification:
353 * DSP0249 (Platform Level Data Model specification)
355 enum scmi_sensor_class {
425 NEWTON_METERS = 0x45,
436 CORRECTED_ERRS = 0x50,
437 UNCORRECTABLE_ERRS = 0x51,
445 METERS_SEC_SQUARED = 0x59,
447 CUBIC_METERS_SEC = 0x5B,
449 RADIANS_SEC_SQUARED = 0x5D,
454 * struct scmi_sensor_proto_ops - represents the various operations provided
455 * by SCMI Sensor Protocol
457 * @count_get: get the count of sensors provided by SCMI
458 * @info_get: get the information of the specified sensor
459 * @trip_point_config: selects and configures a trip-point of interest
460 * @reading_get: gets the current value of the sensor
461 * @reading_get_timestamped: gets the current value and timestamp, when
462 * available, of the sensor. (as of v3.0 spec)
463 * Supports multi-axis sensors for sensors which
464 * supports it and if the @reading array size of
465 * @count entry equals the sensor num_axis
466 * @config_get: Get sensor current configuration
467 * @config_set: Set sensor current configuration
469 struct scmi_sensor_proto_ops {
470 int (*count_get)(const struct scmi_protocol_handle *ph);
471 const struct scmi_sensor_info __must_check *(*info_get)
472 (const struct scmi_protocol_handle *ph, u32 sensor_id);
473 int (*trip_point_config)(const struct scmi_protocol_handle *ph,
474 u32 sensor_id, u8 trip_id, u64 trip_value);
475 int (*reading_get)(const struct scmi_protocol_handle *ph, u32 sensor_id,
477 int (*reading_get_timestamped)(const struct scmi_protocol_handle *ph,
478 u32 sensor_id, u8 count,
479 struct scmi_sensor_reading *readings);
480 int (*config_get)(const struct scmi_protocol_handle *ph,
481 u32 sensor_id, u32 *sensor_config);
482 int (*config_set)(const struct scmi_protocol_handle *ph,
483 u32 sensor_id, u32 sensor_config);
487 * struct scmi_reset_proto_ops - represents the various operations provided
488 * by SCMI Reset Protocol
490 * @num_domains_get: get the count of reset domains provided by SCMI
491 * @name_get: gets the name of a reset domain
492 * @latency_get: gets the reset latency for the specified reset domain
493 * @reset: resets the specified reset domain
494 * @assert: explicitly assert reset signal of the specified reset domain
495 * @deassert: explicitly deassert reset signal of the specified reset domain
497 struct scmi_reset_proto_ops {
498 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
499 const char *(*name_get)(const struct scmi_protocol_handle *ph,
501 int (*latency_get)(const struct scmi_protocol_handle *ph, u32 domain);
502 int (*reset)(const struct scmi_protocol_handle *ph, u32 domain);
503 int (*assert)(const struct scmi_protocol_handle *ph, u32 domain);
504 int (*deassert)(const struct scmi_protocol_handle *ph, u32 domain);
507 enum scmi_voltage_level_mode {
508 SCMI_VOLTAGE_LEVEL_SET_AUTO,
509 SCMI_VOLTAGE_LEVEL_SET_SYNC,
513 * struct scmi_voltage_info - describe one available SCMI Voltage Domain
515 * @id: the domain ID as advertised by the platform
516 * @segmented: defines the layout of the entries of array @levels_uv.
517 * - when True the entries are to be interpreted as triplets,
518 * each defining a segment representing a range of equally
519 * space voltages: <lowest_volts>, <highest_volt>, <step_uV>
520 * - when False the entries simply represent a single discrete
521 * supported voltage level
522 * @negative_volts_allowed: True if any of the entries of @levels_uv represent
523 * a negative voltage.
524 * @async_level_set: True when the voltage domain supports asynchronous level
526 * @name: name assigned to the Voltage Domain by platform
527 * @num_levels: number of total entries in @levels_uv.
528 * @levels_uv: array of entries describing the available voltage levels for
531 struct scmi_voltage_info {
534 bool negative_volts_allowed;
535 bool async_level_set;
536 char name[SCMI_MAX_STR_SIZE];
537 unsigned int num_levels;
538 #define SCMI_VOLTAGE_SEGMENT_LOW 0
539 #define SCMI_VOLTAGE_SEGMENT_HIGH 1
540 #define SCMI_VOLTAGE_SEGMENT_STEP 2
545 * struct scmi_voltage_proto_ops - represents the various operations provided
546 * by SCMI Voltage Protocol
548 * @num_domains_get: get the count of voltage domains provided by SCMI
549 * @info_get: get the information of the specified domain
550 * @config_set: set the config for the specified domain
551 * @config_get: get the config of the specified domain
552 * @level_set: set the voltage level for the specified domain
553 * @level_get: get the voltage level of the specified domain
555 struct scmi_voltage_proto_ops {
556 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
557 const struct scmi_voltage_info __must_check *(*info_get)
558 (const struct scmi_protocol_handle *ph, u32 domain_id);
559 int (*config_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
561 #define SCMI_VOLTAGE_ARCH_STATE_OFF 0x0
562 #define SCMI_VOLTAGE_ARCH_STATE_ON 0x7
563 int (*config_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
565 int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
566 enum scmi_voltage_level_mode mode, s32 volt_uV);
567 int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
572 * struct scmi_powercap_info - Describe one available Powercap domain
574 * @id: Domain ID as advertised by the platform.
575 * @notify_powercap_cap_change: CAP change notification support.
576 * @notify_powercap_measurement_change: MEASUREMENTS change notifications
578 * @async_powercap_cap_set: Asynchronous CAP set support.
579 * @powercap_cap_config: CAP configuration support.
580 * @powercap_monitoring: Monitoring (measurements) support.
581 * @powercap_pai_config: PAI configuration support.
582 * @powercap_scale_mw: Domain reports power data in milliwatt units.
583 * @powercap_scale_uw: Domain reports power data in microwatt units.
584 * Note that, when both @powercap_scale_mw and
585 * @powercap_scale_uw are set to false, the domain
586 * reports power data on an abstract linear scale.
587 * @name: name assigned to the Powercap Domain by platform.
588 * @min_pai: Minimum configurable PAI.
589 * @max_pai: Maximum configurable PAI.
590 * @pai_step: Step size between two consecutive PAI values.
591 * @min_power_cap: Minimum configurable CAP.
592 * @max_power_cap: Maximum configurable CAP.
593 * @power_cap_step: Step size between two consecutive CAP values.
594 * @sustainable_power: Maximum sustainable power consumption for this domain
595 * under normal conditions.
596 * @accuracy: The accuracy with which the power is measured and reported in
597 * integral multiples of 0.001 percent.
598 * @parent_id: Identifier of the containing parent power capping domain, or the
599 * value 0xFFFFFFFF if this powercap domain is a root domain not
600 * contained in any other domain.
602 struct scmi_powercap_info {
604 bool notify_powercap_cap_change;
605 bool notify_powercap_measurement_change;
606 bool async_powercap_cap_set;
607 bool powercap_cap_config;
608 bool powercap_monitoring;
609 bool powercap_pai_config;
610 bool powercap_scale_mw;
611 bool powercap_scale_uw;
613 char name[SCMI_MAX_STR_SIZE];
614 unsigned int min_pai;
615 unsigned int max_pai;
616 unsigned int pai_step;
617 unsigned int min_power_cap;
618 unsigned int max_power_cap;
619 unsigned int power_cap_step;
620 unsigned int sustainable_power;
621 unsigned int accuracy;
622 #define SCMI_POWERCAP_ROOT_ZONE_ID 0xFFFFFFFFUL
623 unsigned int parent_id;
624 struct scmi_fc_info *fc_info;
628 * struct scmi_powercap_proto_ops - represents the various operations provided
629 * by SCMI Powercap Protocol
631 * @num_domains_get: get the count of powercap domains provided by SCMI.
632 * @info_get: get the information for the specified domain.
633 * @cap_get: get the current CAP value for the specified domain.
634 * On SCMI platforms supporting powercap zone disabling, this could
635 * report a zero value for a zone where powercapping is disabled.
636 * @cap_set: set the CAP value for the specified domain to the provided value;
637 * if the domain supports setting the CAP with an asynchronous command
638 * this request will finally trigger an asynchronous transfer, but, if
639 * @ignore_dresp here is set to true, this call will anyway return
640 * immediately without waiting for the related delayed response.
641 * Note that the powercap requested value must NOT be zero, even if
642 * the platform supports disabling a powercap by setting its cap to
643 * zero (since SCMI v3.2): there are dedicated operations that should
644 * be used for that. (@cap_enable_set/get)
645 * @cap_enable_set: enable or disable the powercapping on the specified domain,
646 * if supported by the SCMI platform implementation.
647 * Note that, by the SCMI specification, the platform can
648 * silently ignore our disable request and decide to enforce
649 * anyway some other powercap value requested by another agent
650 * on the system: for this reason @cap_get and @cap_enable_get
651 * will always report the final platform view of the powercaps.
652 * @cap_enable_get: get the current CAP enable status for the specified domain.
653 * @pai_get: get the current PAI value for the specified domain.
654 * @pai_set: set the PAI value for the specified domain to the provided value.
655 * @measurements_get: retrieve the current average power measurements for the
656 * specified domain and the related PAI upon which is
658 * @measurements_threshold_set: set the desired low and high power thresholds
659 * to be used when registering for notification
660 * of type POWERCAP_MEASUREMENTS_NOTIFY with this
662 * Note that this must be called at least once
663 * before registering any callback with the usual
664 * @scmi_notify_ops; moreover, in case this method
665 * is called with measurement notifications already
666 * enabled it will also trigger, transparently, a
667 * proper update of the power thresholds configured
668 * in the SCMI backend server.
669 * @measurements_threshold_get: get the currently configured low and high power
670 * thresholds used when registering callbacks for
671 * notification POWERCAP_MEASUREMENTS_NOTIFY.
673 struct scmi_powercap_proto_ops {
674 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
675 const struct scmi_powercap_info __must_check *(*info_get)
676 (const struct scmi_protocol_handle *ph, u32 domain_id);
677 int (*cap_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
679 int (*cap_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
680 u32 power_cap, bool ignore_dresp);
681 int (*cap_enable_set)(const struct scmi_protocol_handle *ph,
682 u32 domain_id, bool enable);
683 int (*cap_enable_get)(const struct scmi_protocol_handle *ph,
684 u32 domain_id, bool *enable);
685 int (*pai_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
687 int (*pai_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
689 int (*measurements_get)(const struct scmi_protocol_handle *ph,
690 u32 domain_id, u32 *average_power, u32 *pai);
691 int (*measurements_threshold_set)(const struct scmi_protocol_handle *ph,
692 u32 domain_id, u32 power_thresh_low,
693 u32 power_thresh_high);
694 int (*measurements_threshold_get)(const struct scmi_protocol_handle *ph,
695 u32 domain_id, u32 *power_thresh_low,
696 u32 *power_thresh_high);
700 * struct scmi_notify_ops - represents notifications' operations provided by
702 * @devm_event_notifier_register: Managed registration of a notifier_block for
703 * the requested event
704 * @devm_event_notifier_unregister: Managed unregistration of a notifier_block
705 * for the requested event
706 * @event_notifier_register: Register a notifier_block for the requested event
707 * @event_notifier_unregister: Unregister a notifier_block for the requested
710 * A user can register/unregister its own notifier_block against the wanted
711 * platform instance regarding the desired event identified by the
712 * tuple: (proto_id, evt_id, src_id) using the provided register/unregister
715 * @sdev: The scmi_device to use when calling the devres managed ops devm_
716 * @handle: The handle identifying the platform instance to use, when not
717 * calling the managed ops devm_
718 * @proto_id: The protocol ID as in SCMI Specification
719 * @evt_id: The message ID of the desired event as in SCMI Specification
720 * @src_id: A pointer to the desired source ID if different sources are
721 * possible for the protocol (like domain_id, sensor_id...etc)
723 * @src_id can be provided as NULL if it simply does NOT make sense for
724 * the protocol at hand, OR if the user is explicitly interested in
725 * receiving notifications from ANY existent source associated to the
726 * specified proto_id / evt_id.
728 * Received notifications are finally delivered to the registered users,
729 * invoking the callback provided with the notifier_block *nb as follows:
731 * int user_cb(nb, evt_id, report)
735 * @nb: The notifier block provided by the user
736 * @evt_id: The message ID of the delivered event
737 * @report: A custom struct describing the specific event delivered
739 struct scmi_notify_ops {
740 int (*devm_event_notifier_register)(struct scmi_device *sdev,
741 u8 proto_id, u8 evt_id,
743 struct notifier_block *nb);
744 int (*devm_event_notifier_unregister)(struct scmi_device *sdev,
745 u8 proto_id, u8 evt_id,
747 struct notifier_block *nb);
748 int (*event_notifier_register)(const struct scmi_handle *handle,
749 u8 proto_id, u8 evt_id,
751 struct notifier_block *nb);
752 int (*event_notifier_unregister)(const struct scmi_handle *handle,
753 u8 proto_id, u8 evt_id,
755 struct notifier_block *nb);
759 * struct scmi_handle - Handle returned to ARM SCMI clients for usage.
761 * @dev: pointer to the SCMI device
762 * @version: pointer to the structure containing SCMI version information
763 * @devm_protocol_acquire: devres managed method to get hold of a protocol,
764 * causing its initialization and related resource
766 * @devm_protocol_get: devres managed method to acquire a protocol and get specific
767 * operations and a dedicated protocol handler
768 * @devm_protocol_put: devres managed method to release a protocol
769 * @is_transport_atomic: method to check if the underlying transport for this
770 * instance handle is configured to support atomic
771 * transactions for commands.
772 * Some users of the SCMI stack in the upper layers could
773 * be interested to know if they can assume SCMI
774 * command transactions associated to this handle will
775 * never sleep and act accordingly.
776 * An optional atomic threshold value could be returned
778 * @notify_ops: pointer to set of notifications related operations
782 struct scmi_revision_info *version;
784 int __must_check (*devm_protocol_acquire)(struct scmi_device *sdev,
786 const void __must_check *
787 (*devm_protocol_get)(struct scmi_device *sdev, u8 proto,
788 struct scmi_protocol_handle **ph);
789 void (*devm_protocol_put)(struct scmi_device *sdev, u8 proto);
790 bool (*is_transport_atomic)(const struct scmi_handle *handle,
791 unsigned int *atomic_threshold);
793 const struct scmi_notify_ops *notify_ops;
796 enum scmi_std_protocol {
797 SCMI_PROTOCOL_BASE = 0x10,
798 SCMI_PROTOCOL_POWER = 0x11,
799 SCMI_PROTOCOL_SYSTEM = 0x12,
800 SCMI_PROTOCOL_PERF = 0x13,
801 SCMI_PROTOCOL_CLOCK = 0x14,
802 SCMI_PROTOCOL_SENSOR = 0x15,
803 SCMI_PROTOCOL_RESET = 0x16,
804 SCMI_PROTOCOL_VOLTAGE = 0x17,
805 SCMI_PROTOCOL_POWERCAP = 0x18,
808 enum scmi_system_events {
809 SCMI_SYSTEM_SHUTDOWN,
810 SCMI_SYSTEM_COLDRESET,
811 SCMI_SYSTEM_WARMRESET,
822 struct scmi_handle *handle;
825 #define to_scmi_dev(d) container_of(d, struct scmi_device, dev)
827 struct scmi_device_id {
834 int (*probe)(struct scmi_device *sdev);
835 void (*remove)(struct scmi_device *sdev);
836 const struct scmi_device_id *id_table;
838 struct device_driver driver;
841 #define to_scmi_driver(d) container_of(d, struct scmi_driver, driver)
843 #if IS_REACHABLE(CONFIG_ARM_SCMI_PROTOCOL)
844 int scmi_driver_register(struct scmi_driver *driver,
845 struct module *owner, const char *mod_name);
846 void scmi_driver_unregister(struct scmi_driver *driver);
849 scmi_driver_register(struct scmi_driver *driver, struct module *owner,
850 const char *mod_name)
855 static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
856 #endif /* CONFIG_ARM_SCMI_PROTOCOL */
858 #define scmi_register(driver) \
859 scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
860 #define scmi_unregister(driver) \
861 scmi_driver_unregister(driver)
864 * module_scmi_driver() - Helper macro for registering a scmi driver
865 * @__scmi_driver: scmi_driver structure
867 * Helper macro for scmi drivers to set up proper module init / exit
868 * functions. Replaces module_init() and module_exit() and keeps people from
869 * printing pointless things to the kernel log when their driver is loaded.
871 #define module_scmi_driver(__scmi_driver) \
872 module_driver(__scmi_driver, scmi_register, scmi_unregister)
875 * module_scmi_protocol() - Helper macro for registering a scmi protocol
876 * @__scmi_protocol: scmi_protocol structure
878 * Helper macro for scmi drivers to set up proper module init / exit
879 * functions. Replaces module_init() and module_exit() and keeps people from
880 * printing pointless things to the kernel log when their driver is loaded.
882 #define module_scmi_protocol(__scmi_protocol) \
883 module_driver(__scmi_protocol, \
884 scmi_protocol_register, scmi_protocol_unregister)
886 struct scmi_protocol;
887 int scmi_protocol_register(const struct scmi_protocol *proto);
888 void scmi_protocol_unregister(const struct scmi_protocol *proto);
890 /* SCMI Notification API - Custom Event Reports */
891 enum scmi_notification_events {
892 SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
893 SCMI_EVENT_CLOCK_RATE_CHANGED = 0x0,
894 SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED = 0x1,
895 SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
896 SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
897 SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
898 SCMI_EVENT_SENSOR_UPDATE = 0x1,
899 SCMI_EVENT_RESET_ISSUED = 0x0,
900 SCMI_EVENT_BASE_ERROR_EVENT = 0x0,
901 SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER = 0x0,
902 SCMI_EVENT_POWERCAP_CAP_CHANGED = 0x0,
903 SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED = 0x1,
906 struct scmi_power_state_changed_report {
908 unsigned int agent_id;
909 unsigned int domain_id;
910 unsigned int power_state;
913 struct scmi_clock_rate_notif_report {
915 unsigned int agent_id;
916 unsigned int clock_id;
917 unsigned long long rate;
920 struct scmi_system_power_state_notifier_report {
922 unsigned int agent_id;
923 #define SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(flags) ((flags) & BIT(0))
925 unsigned int system_state;
926 unsigned int timeout;
929 struct scmi_perf_limits_report {
931 unsigned int agent_id;
932 unsigned int domain_id;
933 unsigned int range_max;
934 unsigned int range_min;
937 struct scmi_perf_level_report {
939 unsigned int agent_id;
940 unsigned int domain_id;
941 unsigned int performance_level;
944 struct scmi_sensor_trip_point_report {
946 unsigned int agent_id;
947 unsigned int sensor_id;
948 unsigned int trip_point_desc;
951 struct scmi_sensor_update_report {
953 unsigned int agent_id;
954 unsigned int sensor_id;
955 unsigned int readings_count;
956 struct scmi_sensor_reading readings[];
959 struct scmi_reset_issued_report {
961 unsigned int agent_id;
962 unsigned int domain_id;
963 unsigned int reset_state;
966 struct scmi_base_error_report {
968 unsigned int agent_id;
970 unsigned int cmd_count;
971 unsigned long long reports[];
974 struct scmi_powercap_cap_changed_report {
976 unsigned int agent_id;
977 unsigned int domain_id;
978 unsigned int power_cap;
982 struct scmi_powercap_meas_changed_report {
984 unsigned int agent_id;
985 unsigned int domain_id;
988 #endif /* _LINUX_SCMI_PROTOCOL_H */