1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * SCMI Message Protocol driver header
4 *
5 * Copyright (C) 2018-2021 ARM Ltd.
6 */
7
8 #ifndef _LINUX_SCMI_PROTOCOL_H
9 #define _LINUX_SCMI_PROTOCOL_H
10
11 #include <linux/bitfield.h>
12 #include <linux/device.h>
13 #include <linux/notifier.h>
14 #include <linux/types.h>
15
16 #define SCMI_MAX_STR_SIZE 64
17 #define SCMI_SHORT_NAME_MAX_SIZE 16
18 #define SCMI_MAX_NUM_RATES 16
19
20 /**
21 * struct scmi_revision_info - version information structure
22 *
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
28 * base protocol.
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)
33 */
34 struct scmi_revision_info {
35 u16 major_ver;
36 u16 minor_ver;
37 u8 num_protocols;
38 u8 num_agents;
39 u32 impl_ver;
40 char vendor_id[SCMI_SHORT_NAME_MAX_SIZE];
41 char sub_vendor_id[SCMI_SHORT_NAME_MAX_SIZE];
42 };
43
44 struct scmi_clock_info {
45 char name[SCMI_MAX_STR_SIZE];
46 unsigned int enable_latency;
47 bool rate_discrete;
48 bool rate_changed_notifications;
49 bool rate_change_requested_notifications;
50 union {
51 struct {
52 int num_rates;
53 u64 rates[SCMI_MAX_NUM_RATES];
54 } list;
55 struct {
56 u64 min_rate;
57 u64 max_rate;
58 u64 step_size;
59 } range;
60 };
61 };
62
63 enum scmi_power_scale {
64 SCMI_POWER_BOGOWATTS,
65 SCMI_POWER_MILLIWATTS,
66 SCMI_POWER_MICROWATTS
67 };
68
69 struct scmi_handle;
70 struct scmi_device;
71 struct scmi_protocol_handle;
72
73 /**
74 * struct scmi_clk_proto_ops - represents the various operations provided
75 * by SCMI Clock Protocol
76 *
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
83 */
84 struct scmi_clk_proto_ops {
85 int (*count_get)(const struct scmi_protocol_handle *ph);
86
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,
90 u64 *rate);
91 int (*rate_set)(const struct scmi_protocol_handle *ph, u32 clk_id,
92 u64 rate);
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,
97 u32 clk_id);
98 };
99
100 /**
101 * struct scmi_perf_proto_ops - represents the various operations provided
102 * by SCMI Performance Protocol
103 *
104 * @limits_set: sets limits on the performance level of a domain
105 * @limits_get: gets limits on the performance level of a domain
106 * @level_set: sets the performance level of a domain
107 * @level_get: gets the performance level of a domain
108 * @device_domain_id: gets the scmi domain id for a given device
109 * @transition_latency_get: gets the DVFS transition latency for a given device
110 * @device_opps_add: adds all the OPPs for a given device
111 * @freq_set: sets the frequency for a given device using sustained frequency
112 * to sustained performance level mapping
113 * @freq_get: gets the frequency for a given device using sustained frequency
114 * to sustained performance level mapping
115 * @est_power_get: gets the estimated power cost for a given performance domain
116 * at a given frequency
117 * @fast_switch_possible: indicates if fast DVFS switching is possible or not
118 * for a given device
119 * @power_scale_mw_get: indicates if the power values provided are in milliWatts
120 * or in some other (abstract) scale
121 */
122 struct scmi_perf_proto_ops {
123 int (*limits_set)(const struct scmi_protocol_handle *ph, u32 domain,
124 u32 max_perf, u32 min_perf);
125 int (*limits_get)(const struct scmi_protocol_handle *ph, u32 domain,
126 u32 *max_perf, u32 *min_perf);
127 int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain,
128 u32 level, bool poll);
129 int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain,
130 u32 *level, bool poll);
131 int (*device_domain_id)(struct device *dev);
132 int (*transition_latency_get)(const struct scmi_protocol_handle *ph,
133 struct device *dev);
134 int (*device_opps_add)(const struct scmi_protocol_handle *ph,
135 struct device *dev);
136 int (*freq_set)(const struct scmi_protocol_handle *ph, u32 domain,
137 unsigned long rate, bool poll);
138 int (*freq_get)(const struct scmi_protocol_handle *ph, u32 domain,
139 unsigned long *rate, bool poll);
140 int (*est_power_get)(const struct scmi_protocol_handle *ph, u32 domain,
141 unsigned long *rate, unsigned long *power);
142 bool (*fast_switch_possible)(const struct scmi_protocol_handle *ph,
143 struct device *dev);
144 enum scmi_power_scale (*power_scale_get)(const struct scmi_protocol_handle *ph);
145 };
146
147 /**
148 * struct scmi_power_proto_ops - represents the various operations provided
149 * by SCMI Power Protocol
150 *
151 * @num_domains_get: get the count of power domains provided by SCMI
152 * @name_get: gets the name of a power domain
153 * @state_set: sets the power state of a power domain
154 * @state_get: gets the power state of a power domain
155 */
156 struct scmi_power_proto_ops {
157 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
158 const char *(*name_get)(const struct scmi_protocol_handle *ph,
159 u32 domain);
160 #define SCMI_POWER_STATE_TYPE_SHIFT 30
161 #define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1)
162 #define SCMI_POWER_STATE_PARAM(type, id) \
163 ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \
164 ((id) & SCMI_POWER_STATE_ID_MASK))
165 #define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0)
166 #define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0)
167 int (*state_set)(const struct scmi_protocol_handle *ph, u32 domain,
168 u32 state);
169 int (*state_get)(const struct scmi_protocol_handle *ph, u32 domain,
170 u32 *state);
171 };
172
173 /**
174 * struct scmi_sensor_reading - represent a timestamped read
175 *
176 * Used by @reading_get_timestamped method.
177 *
178 * @value: The signed value sensor read.
179 * @timestamp: An unsigned timestamp for the sensor read, as provided by
180 * SCMI platform. Set to zero when not available.
181 */
182 struct scmi_sensor_reading {
183 long long value;
184 unsigned long long timestamp;
185 };
186
187 /**
188 * struct scmi_range_attrs - specifies a sensor or axis values' range
189 * @min_range: The minimum value which can be represented by the sensor/axis.
190 * @max_range: The maximum value which can be represented by the sensor/axis.
191 */
192 struct scmi_range_attrs {
193 long long min_range;
194 long long max_range;
195 };
196
197 /**
198 * struct scmi_sensor_axis_info - describes one sensor axes
199 * @id: The axes ID.
200 * @type: Axes type. Chosen amongst one of @enum scmi_sensor_class.
201 * @scale: Power-of-10 multiplier applied to the axis unit.
202 * @name: NULL-terminated string representing axes name as advertised by
203 * SCMI platform.
204 * @extended_attrs: Flag to indicate the presence of additional extended
205 * attributes for this axes.
206 * @resolution: Extended attribute representing the resolution of the axes.
207 * Set to 0 if not reported by this axes.
208 * @exponent: Extended attribute representing the power-of-10 multiplier that
209 * is applied to the resolution field. Set to 0 if not reported by
210 * this axes.
211 * @attrs: Extended attributes representing minimum and maximum values
212 * measurable by this axes. Set to 0 if not reported by this sensor.
213 */
214 struct scmi_sensor_axis_info {
215 unsigned int id;
216 unsigned int type;
217 int scale;
218 char name[SCMI_MAX_STR_SIZE];
219 bool extended_attrs;
220 unsigned int resolution;
221 int exponent;
222 struct scmi_range_attrs attrs;
223 };
224
225 /**
226 * struct scmi_sensor_intervals_info - describes number and type of available
227 * update intervals
228 * @segmented: Flag for segmented intervals' representation. When True there
229 * will be exactly 3 intervals in @desc, with each entry
230 * representing a member of a segment in this order:
231 * {lowest update interval, highest update interval, step size}
232 * @count: Number of intervals described in @desc.
233 * @desc: Array of @count interval descriptor bitmask represented as detailed in
234 * the SCMI specification: it can be accessed using the accompanying
235 * macros.
236 * @prealloc_pool: A minimal preallocated pool of desc entries used to avoid
237 * lesser-than-64-bytes dynamic allocation for small @count
238 * values.
239 */
240 struct scmi_sensor_intervals_info {
241 bool segmented;
242 unsigned int count;
243 #define SCMI_SENS_INTVL_SEGMENT_LOW 0
244 #define SCMI_SENS_INTVL_SEGMENT_HIGH 1
245 #define SCMI_SENS_INTVL_SEGMENT_STEP 2
246 unsigned int *desc;
247 #define SCMI_SENS_INTVL_GET_SECS(x) FIELD_GET(GENMASK(20, 5), (x))
248 #define SCMI_SENS_INTVL_GET_EXP(x) \
249 ({ \
250 int __signed_exp = FIELD_GET(GENMASK(4, 0), (x)); \
251 \
252 if (__signed_exp & BIT(4)) \
253 __signed_exp |= GENMASK(31, 5); \
254 __signed_exp; \
255 })
256 #define SCMI_MAX_PREALLOC_POOL 16
257 unsigned int prealloc_pool[SCMI_MAX_PREALLOC_POOL];
258 };
259
260 /**
261 * struct scmi_sensor_info - represents information related to one of the
262 * available sensors.
263 * @id: Sensor ID.
264 * @type: Sensor type. Chosen amongst one of @enum scmi_sensor_class.
265 * @scale: Power-of-10 multiplier applied to the sensor unit.
266 * @num_trip_points: Number of maximum configurable trip points.
267 * @async: Flag for asynchronous read support.
268 * @update: Flag for continuouos update notification support.
269 * @timestamped: Flag for timestamped read support.
270 * @tstamp_scale: Power-of-10 multiplier applied to the sensor timestamps to
271 * represent it in seconds.
272 * @num_axis: Number of supported axis if any. Reported as 0 for scalar sensors.
273 * @axis: Pointer to an array of @num_axis descriptors.
274 * @intervals: Descriptor of available update intervals.
275 * @sensor_config: A bitmask reporting the current sensor configuration as
276 * detailed in the SCMI specification: it can accessed and
277 * modified through the accompanying macros.
278 * @name: NULL-terminated string representing sensor name as advertised by
279 * SCMI platform.
280 * @extended_scalar_attrs: Flag to indicate the presence of additional extended
281 * attributes for this sensor.
282 * @sensor_power: Extended attribute representing the average power
283 * consumed by the sensor in microwatts (uW) when it is active.
284 * Reported here only for scalar sensors.
285 * Set to 0 if not reported by this sensor.
286 * @resolution: Extended attribute representing the resolution of the sensor.
287 * Reported here only for scalar sensors.
288 * Set to 0 if not reported by this sensor.
289 * @exponent: Extended attribute representing the power-of-10 multiplier that is
290 * applied to the resolution field.
291 * Reported here only for scalar sensors.
292 * Set to 0 if not reported by this sensor.
293 * @scalar_attrs: Extended attributes representing minimum and maximum
294 * measurable values by this sensor.
295 * Reported here only for scalar sensors.
296 * Set to 0 if not reported by this sensor.
297 */
298 struct scmi_sensor_info {
299 unsigned int id;
300 unsigned int type;
301 int scale;
302 unsigned int num_trip_points;
303 bool async;
304 bool update;
305 bool timestamped;
306 int tstamp_scale;
307 unsigned int num_axis;
308 struct scmi_sensor_axis_info *axis;
309 struct scmi_sensor_intervals_info intervals;
310 unsigned int sensor_config;
311 #define SCMI_SENS_CFG_UPDATE_SECS_MASK GENMASK(31, 16)
312 #define SCMI_SENS_CFG_GET_UPDATE_SECS(x) \
313 FIELD_GET(SCMI_SENS_CFG_UPDATE_SECS_MASK, (x))
314
315 #define SCMI_SENS_CFG_UPDATE_EXP_MASK GENMASK(15, 11)
316 #define SCMI_SENS_CFG_GET_UPDATE_EXP(x) \
317 ({ \
318 int __signed_exp = \
319 FIELD_GET(SCMI_SENS_CFG_UPDATE_EXP_MASK, (x)); \
320 \
321 if (__signed_exp & BIT(4)) \
322 __signed_exp |= GENMASK(31, 5); \
323 __signed_exp; \
324 })
325
326 #define SCMI_SENS_CFG_ROUND_MASK GENMASK(10, 9)
327 #define SCMI_SENS_CFG_ROUND_AUTO 2
328 #define SCMI_SENS_CFG_ROUND_UP 1
329 #define SCMI_SENS_CFG_ROUND_DOWN 0
330
331 #define SCMI_SENS_CFG_TSTAMP_ENABLED_MASK BIT(1)
332 #define SCMI_SENS_CFG_TSTAMP_ENABLE 1
333 #define SCMI_SENS_CFG_TSTAMP_DISABLE 0
334 #define SCMI_SENS_CFG_IS_TSTAMP_ENABLED(x) \
335 FIELD_GET(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, (x))
336
337 #define SCMI_SENS_CFG_SENSOR_ENABLED_MASK BIT(0)
338 #define SCMI_SENS_CFG_SENSOR_ENABLE 1
339 #define SCMI_SENS_CFG_SENSOR_DISABLE 0
340 char name[SCMI_MAX_STR_SIZE];
341 #define SCMI_SENS_CFG_IS_ENABLED(x) FIELD_GET(BIT(0), (x))
342 bool extended_scalar_attrs;
343 unsigned int sensor_power;
344 unsigned int resolution;
345 int exponent;
346 struct scmi_range_attrs scalar_attrs;
347 };
348
349 /*
350 * Partial list from Distributed Management Task Force (DMTF) specification:
351 * DSP0249 (Platform Level Data Model specification)
352 */
353 enum scmi_sensor_class {
354 NONE = 0x0,
355 UNSPEC = 0x1,
356 TEMPERATURE_C = 0x2,
357 TEMPERATURE_F = 0x3,
358 TEMPERATURE_K = 0x4,
359 VOLTAGE = 0x5,
360 CURRENT = 0x6,
361 POWER = 0x7,
362 ENERGY = 0x8,
363 CHARGE = 0x9,
364 VOLTAMPERE = 0xA,
365 NITS = 0xB,
366 LUMENS = 0xC,
367 LUX = 0xD,
368 CANDELAS = 0xE,
369 KPA = 0xF,
370 PSI = 0x10,
371 NEWTON = 0x11,
372 CFM = 0x12,
373 RPM = 0x13,
374 HERTZ = 0x14,
375 SECS = 0x15,
376 MINS = 0x16,
377 HOURS = 0x17,
378 DAYS = 0x18,
379 WEEKS = 0x19,
380 MILS = 0x1A,
381 INCHES = 0x1B,
382 FEET = 0x1C,
383 CUBIC_INCHES = 0x1D,
384 CUBIC_FEET = 0x1E,
385 METERS = 0x1F,
386 CUBIC_CM = 0x20,
387 CUBIC_METERS = 0x21,
388 LITERS = 0x22,
389 FLUID_OUNCES = 0x23,
390 RADIANS = 0x24,
391 STERADIANS = 0x25,
392 REVOLUTIONS = 0x26,
393 CYCLES = 0x27,
394 GRAVITIES = 0x28,
395 OUNCES = 0x29,
396 POUNDS = 0x2A,
397 FOOT_POUNDS = 0x2B,
398 OUNCE_INCHES = 0x2C,
399 GAUSS = 0x2D,
400 GILBERTS = 0x2E,
401 HENRIES = 0x2F,
402 FARADS = 0x30,
403 OHMS = 0x31,
404 SIEMENS = 0x32,
405 MOLES = 0x33,
406 BECQUERELS = 0x34,
407 PPM = 0x35,
408 DECIBELS = 0x36,
409 DBA = 0x37,
410 DBC = 0x38,
411 GRAYS = 0x39,
412 SIEVERTS = 0x3A,
413 COLOR_TEMP_K = 0x3B,
414 BITS = 0x3C,
415 BYTES = 0x3D,
416 WORDS = 0x3E,
417 DWORDS = 0x3F,
418 QWORDS = 0x40,
419 PERCENTAGE = 0x41,
420 PASCALS = 0x42,
421 COUNTS = 0x43,
422 GRAMS = 0x44,
423 NEWTON_METERS = 0x45,
424 HITS = 0x46,
425 MISSES = 0x47,
426 RETRIES = 0x48,
427 OVERRUNS = 0x49,
428 UNDERRUNS = 0x4A,
429 COLLISIONS = 0x4B,
430 PACKETS = 0x4C,
431 MESSAGES = 0x4D,
432 CHARS = 0x4E,
433 ERRORS = 0x4F,
434 CORRECTED_ERRS = 0x50,
435 UNCORRECTABLE_ERRS = 0x51,
436 SQ_MILS = 0x52,
437 SQ_INCHES = 0x53,
438 SQ_FEET = 0x54,
439 SQ_CM = 0x55,
440 SQ_METERS = 0x56,
441 RADIANS_SEC = 0x57,
442 BPM = 0x58,
443 METERS_SEC_SQUARED = 0x59,
444 METERS_SEC = 0x5A,
445 CUBIC_METERS_SEC = 0x5B,
446 MM_MERCURY = 0x5C,
447 RADIANS_SEC_SQUARED = 0x5D,
448 OEM_UNIT = 0xFF
449 };
450
451 /**
452 * struct scmi_sensor_proto_ops - represents the various operations provided
453 * by SCMI Sensor Protocol
454 *
455 * @count_get: get the count of sensors provided by SCMI
456 * @info_get: get the information of the specified sensor
457 * @trip_point_config: selects and configures a trip-point of interest
458 * @reading_get: gets the current value of the sensor
459 * @reading_get_timestamped: gets the current value and timestamp, when
460 * available, of the sensor. (as of v3.0 spec)
461 * Supports multi-axis sensors for sensors which
462 * supports it and if the @reading array size of
463 * @count entry equals the sensor num_axis
464 * @config_get: Get sensor current configuration
465 * @config_set: Set sensor current configuration
466 */
467 struct scmi_sensor_proto_ops {
468 int (*count_get)(const struct scmi_protocol_handle *ph);
469 const struct scmi_sensor_info __must_check *(*info_get)
470 (const struct scmi_protocol_handle *ph, u32 sensor_id);
471 int (*trip_point_config)(const struct scmi_protocol_handle *ph,
472 u32 sensor_id, u8 trip_id, u64 trip_value);
473 int (*reading_get)(const struct scmi_protocol_handle *ph, u32 sensor_id,
474 u64 *value);
475 int (*reading_get_timestamped)(const struct scmi_protocol_handle *ph,
476 u32 sensor_id, u8 count,
477 struct scmi_sensor_reading *readings);
478 int (*config_get)(const struct scmi_protocol_handle *ph,
479 u32 sensor_id, u32 *sensor_config);
480 int (*config_set)(const struct scmi_protocol_handle *ph,
481 u32 sensor_id, u32 sensor_config);
482 };
483
484 /**
485 * struct scmi_reset_proto_ops - represents the various operations provided
486 * by SCMI Reset Protocol
487 *
488 * @num_domains_get: get the count of reset domains provided by SCMI
489 * @name_get: gets the name of a reset domain
490 * @latency_get: gets the reset latency for the specified reset domain
491 * @reset: resets the specified reset domain
492 * @assert: explicitly assert reset signal of the specified reset domain
493 * @deassert: explicitly deassert reset signal of the specified reset domain
494 */
495 struct scmi_reset_proto_ops {
496 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
497 const char *(*name_get)(const struct scmi_protocol_handle *ph,
498 u32 domain);
499 int (*latency_get)(const struct scmi_protocol_handle *ph, u32 domain);
500 int (*reset)(const struct scmi_protocol_handle *ph, u32 domain);
501 int (*assert)(const struct scmi_protocol_handle *ph, u32 domain);
502 int (*deassert)(const struct scmi_protocol_handle *ph, u32 domain);
503 };
504
505 enum scmi_voltage_level_mode {
506 SCMI_VOLTAGE_LEVEL_SET_AUTO,
507 SCMI_VOLTAGE_LEVEL_SET_SYNC,
508 };
509
510 /**
511 * struct scmi_voltage_info - describe one available SCMI Voltage Domain
512 *
513 * @id: the domain ID as advertised by the platform
514 * @segmented: defines the layout of the entries of array @levels_uv.
515 * - when True the entries are to be interpreted as triplets,
516 * each defining a segment representing a range of equally
517 * space voltages: <lowest_volts>, <highest_volt>, <step_uV>
518 * - when False the entries simply represent a single discrete
519 * supported voltage level
520 * @negative_volts_allowed: True if any of the entries of @levels_uv represent
521 * a negative voltage.
522 * @async_level_set: True when the voltage domain supports asynchronous level
523 * set commands.
524 * @name: name assigned to the Voltage Domain by platform
525 * @num_levels: number of total entries in @levels_uv.
526 * @levels_uv: array of entries describing the available voltage levels for
527 * this domain.
528 */
529 struct scmi_voltage_info {
530 unsigned int id;
531 bool segmented;
532 bool negative_volts_allowed;
533 bool async_level_set;
534 char name[SCMI_MAX_STR_SIZE];
535 unsigned int num_levels;
536 #define SCMI_VOLTAGE_SEGMENT_LOW 0
537 #define SCMI_VOLTAGE_SEGMENT_HIGH 1
538 #define SCMI_VOLTAGE_SEGMENT_STEP 2
539 int *levels_uv;
540 };
541
542 /**
543 * struct scmi_voltage_proto_ops - represents the various operations provided
544 * by SCMI Voltage Protocol
545 *
546 * @num_domains_get: get the count of voltage domains provided by SCMI
547 * @info_get: get the information of the specified domain
548 * @config_set: set the config for the specified domain
549 * @config_get: get the config of the specified domain
550 * @level_set: set the voltage level for the specified domain
551 * @level_get: get the voltage level of the specified domain
552 */
553 struct scmi_voltage_proto_ops {
554 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
555 const struct scmi_voltage_info __must_check *(*info_get)
556 (const struct scmi_protocol_handle *ph, u32 domain_id);
557 int (*config_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
558 u32 config);
559 #define SCMI_VOLTAGE_ARCH_STATE_OFF 0x0
560 #define SCMI_VOLTAGE_ARCH_STATE_ON 0x7
561 int (*config_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
562 u32 *config);
563 int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
564 enum scmi_voltage_level_mode mode, s32 volt_uV);
565 int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
566 s32 *volt_uV);
567 };
568
569 /**
570 * struct scmi_powercap_info - Describe one available Powercap domain
571 *
572 * @id: Domain ID as advertised by the platform.
573 * @notify_powercap_cap_change: CAP change notification support.
574 * @notify_powercap_measurement_change: MEASUREMENTS change notifications
575 * support.
576 * @async_powercap_cap_set: Asynchronous CAP set support.
577 * @powercap_cap_config: CAP configuration support.
578 * @powercap_monitoring: Monitoring (measurements) support.
579 * @powercap_pai_config: PAI configuration support.
580 * @powercap_scale_mw: Domain reports power data in milliwatt units.
581 * @powercap_scale_uw: Domain reports power data in microwatt units.
582 * Note that, when both @powercap_scale_mw and
583 * @powercap_scale_uw are set to false, the domain
584 * reports power data on an abstract linear scale.
585 * @name: name assigned to the Powercap Domain by platform.
586 * @min_pai: Minimum configurable PAI.
587 * @max_pai: Maximum configurable PAI.
588 * @pai_step: Step size between two consecutive PAI values.
589 * @min_power_cap: Minimum configurable CAP.
590 * @max_power_cap: Maximum configurable CAP.
591 * @power_cap_step: Step size between two consecutive CAP values.
592 * @sustainable_power: Maximum sustainable power consumption for this domain
593 * under normal conditions.
594 * @accuracy: The accuracy with which the power is measured and reported in
595 * integral multiples of 0.001 percent.
596 * @parent_id: Identifier of the containing parent power capping domain, or the
597 * value 0xFFFFFFFF if this powercap domain is a root domain not
598 * contained in any other domain.
599 */
600 struct scmi_powercap_info {
601 unsigned int id;
602 bool notify_powercap_cap_change;
603 bool notify_powercap_measurement_change;
604 bool async_powercap_cap_set;
605 bool powercap_cap_config;
606 bool powercap_monitoring;
607 bool powercap_pai_config;
608 bool powercap_scale_mw;
609 bool powercap_scale_uw;
610 bool fastchannels;
611 char name[SCMI_MAX_STR_SIZE];
612 unsigned int min_pai;
613 unsigned int max_pai;
614 unsigned int pai_step;
615 unsigned int min_power_cap;
616 unsigned int max_power_cap;
617 unsigned int power_cap_step;
618 unsigned int sustainable_power;
619 unsigned int accuracy;
620 #define SCMI_POWERCAP_ROOT_ZONE_ID 0xFFFFFFFFUL
621 unsigned int parent_id;
622 struct scmi_fc_info *fc_info;
623 };
624
625 /**
626 * struct scmi_powercap_proto_ops - represents the various operations provided
627 * by SCMI Powercap Protocol
628 *
629 * @num_domains_get: get the count of powercap domains provided by SCMI.
630 * @info_get: get the information for the specified domain.
631 * @cap_get: get the current CAP value for the specified domain.
632 * On SCMI platforms supporting powercap zone disabling, this could
633 * report a zero value for a zone where powercapping is disabled.
634 * @cap_set: set the CAP value for the specified domain to the provided value;
635 * if the domain supports setting the CAP with an asynchronous command
636 * this request will finally trigger an asynchronous transfer, but, if
637 * @ignore_dresp here is set to true, this call will anyway return
638 * immediately without waiting for the related delayed response.
639 * Note that the powercap requested value must NOT be zero, even if
640 * the platform supports disabling a powercap by setting its cap to
641 * zero (since SCMI v3.2): there are dedicated operations that should
642 * be used for that. (@cap_enable_set/get)
643 * @cap_enable_set: enable or disable the powercapping on the specified domain,
644 * if supported by the SCMI platform implementation.
645 * Note that, by the SCMI specification, the platform can
646 * silently ignore our disable request and decide to enforce
647 * anyway some other powercap value requested by another agent
648 * on the system: for this reason @cap_get and @cap_enable_get
649 * will always report the final platform view of the powercaps.
650 * @cap_enable_get: get the current CAP enable status for the specified domain.
651 * @pai_get: get the current PAI value for the specified domain.
652 * @pai_set: set the PAI value for the specified domain to the provided value.
653 * @measurements_get: retrieve the current average power measurements for the
654 * specified domain and the related PAI upon which is
655 * calculated.
656 * @measurements_threshold_set: set the desired low and high power thresholds
657 * to be used when registering for notification
658 * of type POWERCAP_MEASUREMENTS_NOTIFY with this
659 * powercap domain.
660 * Note that this must be called at least once
661 * before registering any callback with the usual
662 * @scmi_notify_ops; moreover, in case this method
663 * is called with measurement notifications already
664 * enabled it will also trigger, transparently, a
665 * proper update of the power thresholds configured
666 * in the SCMI backend server.
667 * @measurements_threshold_get: get the currently configured low and high power
668 * thresholds used when registering callbacks for
669 * notification POWERCAP_MEASUREMENTS_NOTIFY.
670 */
671 struct scmi_powercap_proto_ops {
672 int (*num_domains_get)(const struct scmi_protocol_handle *ph);
673 const struct scmi_powercap_info __must_check *(*info_get)
674 (const struct scmi_protocol_handle *ph, u32 domain_id);
675 int (*cap_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
676 u32 *power_cap);
677 int (*cap_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
678 u32 power_cap, bool ignore_dresp);
679 int (*cap_enable_set)(const struct scmi_protocol_handle *ph,
680 u32 domain_id, bool enable);
681 int (*cap_enable_get)(const struct scmi_protocol_handle *ph,
682 u32 domain_id, bool *enable);
683 int (*pai_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
684 u32 *pai);
685 int (*pai_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
686 u32 pai);
687 int (*measurements_get)(const struct scmi_protocol_handle *ph,
688 u32 domain_id, u32 *average_power, u32 *pai);
689 int (*measurements_threshold_set)(const struct scmi_protocol_handle *ph,
690 u32 domain_id, u32 power_thresh_low,
691 u32 power_thresh_high);
692 int (*measurements_threshold_get)(const struct scmi_protocol_handle *ph,
693 u32 domain_id, u32 *power_thresh_low,
694 u32 *power_thresh_high);
695 };
696
697 /**
698 * struct scmi_notify_ops - represents notifications' operations provided by
699 * SCMI core
700 * @devm_event_notifier_register: Managed registration of a notifier_block for
701 * the requested event
702 * @devm_event_notifier_unregister: Managed unregistration of a notifier_block
703 * for the requested event
704 * @event_notifier_register: Register a notifier_block for the requested event
705 * @event_notifier_unregister: Unregister a notifier_block for the requested
706 * event
707 *
708 * A user can register/unregister its own notifier_block against the wanted
709 * platform instance regarding the desired event identified by the
710 * tuple: (proto_id, evt_id, src_id) using the provided register/unregister
711 * interface where:
712 *
713 * @sdev: The scmi_device to use when calling the devres managed ops devm_
714 * @handle: The handle identifying the platform instance to use, when not
715 * calling the managed ops devm_
716 * @proto_id: The protocol ID as in SCMI Specification
717 * @evt_id: The message ID of the desired event as in SCMI Specification
718 * @src_id: A pointer to the desired source ID if different sources are
719 * possible for the protocol (like domain_id, sensor_id...etc)
720 *
721 * @src_id can be provided as NULL if it simply does NOT make sense for
722 * the protocol at hand, OR if the user is explicitly interested in
723 * receiving notifications from ANY existent source associated to the
724 * specified proto_id / evt_id.
725 *
726 * Received notifications are finally delivered to the registered users,
727 * invoking the callback provided with the notifier_block *nb as follows:
728 *
729 * int user_cb(nb, evt_id, report)
730 *
731 * with:
732 *
733 * @nb: The notifier block provided by the user
734 * @evt_id: The message ID of the delivered event
735 * @report: A custom struct describing the specific event delivered
736 */
737 struct scmi_notify_ops {
738 int (*devm_event_notifier_register)(struct scmi_device *sdev,
739 u8 proto_id, u8 evt_id,
740 const u32 *src_id,
741 struct notifier_block *nb);
742 int (*devm_event_notifier_unregister)(struct scmi_device *sdev,
743 u8 proto_id, u8 evt_id,
744 const u32 *src_id,
745 struct notifier_block *nb);
746 int (*event_notifier_register)(const struct scmi_handle *handle,
747 u8 proto_id, u8 evt_id,
748 const u32 *src_id,
749 struct notifier_block *nb);
750 int (*event_notifier_unregister)(const struct scmi_handle *handle,
751 u8 proto_id, u8 evt_id,
752 const u32 *src_id,
753 struct notifier_block *nb);
754 };
755
756 /**
757 * struct scmi_handle - Handle returned to ARM SCMI clients for usage.
758 *
759 * @dev: pointer to the SCMI device
760 * @version: pointer to the structure containing SCMI version information
761 * @devm_protocol_acquire: devres managed method to get hold of a protocol,
762 * causing its initialization and related resource
763 * accounting
764 * @devm_protocol_get: devres managed method to acquire a protocol and get specific
765 * operations and a dedicated protocol handler
766 * @devm_protocol_put: devres managed method to release a protocol
767 * @is_transport_atomic: method to check if the underlying transport for this
768 * instance handle is configured to support atomic
769 * transactions for commands.
770 * Some users of the SCMI stack in the upper layers could
771 * be interested to know if they can assume SCMI
772 * command transactions associated to this handle will
773 * never sleep and act accordingly.
774 * An optional atomic threshold value could be returned
775 * where configured.
776 * @notify_ops: pointer to set of notifications related operations
777 */
778 struct scmi_handle {
779 struct device *dev;
780 struct scmi_revision_info *version;
781
782 int __must_check (*devm_protocol_acquire)(struct scmi_device *sdev,
783 u8 proto);
784 const void __must_check *
785 (*devm_protocol_get)(struct scmi_device *sdev, u8 proto,
786 struct scmi_protocol_handle **ph);
787 void (*devm_protocol_put)(struct scmi_device *sdev, u8 proto);
788 bool (*is_transport_atomic)(const struct scmi_handle *handle,
789 unsigned int *atomic_threshold);
790
791 const struct scmi_notify_ops *notify_ops;
792 };
793
794 enum scmi_std_protocol {
795 SCMI_PROTOCOL_BASE = 0x10,
796 SCMI_PROTOCOL_POWER = 0x11,
797 SCMI_PROTOCOL_SYSTEM = 0x12,
798 SCMI_PROTOCOL_PERF = 0x13,
799 SCMI_PROTOCOL_CLOCK = 0x14,
800 SCMI_PROTOCOL_SENSOR = 0x15,
801 SCMI_PROTOCOL_RESET = 0x16,
802 SCMI_PROTOCOL_VOLTAGE = 0x17,
803 SCMI_PROTOCOL_POWERCAP = 0x18,
804 };
805
806 enum scmi_system_events {
807 SCMI_SYSTEM_SHUTDOWN,
808 SCMI_SYSTEM_COLDRESET,
809 SCMI_SYSTEM_WARMRESET,
810 SCMI_SYSTEM_POWERUP,
811 SCMI_SYSTEM_SUSPEND,
812 SCMI_SYSTEM_MAX
813 };
814
815 struct scmi_device {
816 u32 id;
817 u8 protocol_id;
818 const char *name;
819 struct device dev;
820 struct scmi_handle *handle;
821 };
822
823 #define to_scmi_dev(d) container_of(d, struct scmi_device, dev)
824
825 struct scmi_device_id {
826 u8 protocol_id;
827 const char *name;
828 };
829
830 struct scmi_driver {
831 const char *name;
832 int (*probe)(struct scmi_device *sdev);
833 void (*remove)(struct scmi_device *sdev);
834 const struct scmi_device_id *id_table;
835
836 struct device_driver driver;
837 };
838
839 #define to_scmi_driver(d) container_of(d, struct scmi_driver, driver)
840
841 #if IS_REACHABLE(CONFIG_ARM_SCMI_PROTOCOL)
842 int scmi_driver_register(struct scmi_driver *driver,
843 struct module *owner, const char *mod_name);
844 void scmi_driver_unregister(struct scmi_driver *driver);
845 #else
846 static inline int
scmi_driver_register(struct scmi_driver * driver,struct module * owner,const char * mod_name)847 scmi_driver_register(struct scmi_driver *driver, struct module *owner,
848 const char *mod_name)
849 {
850 return -EINVAL;
851 }
852
scmi_driver_unregister(struct scmi_driver * driver)853 static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
854 #endif /* CONFIG_ARM_SCMI_PROTOCOL */
855
856 #define scmi_register(driver) \
857 scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
858 #define scmi_unregister(driver) \
859 scmi_driver_unregister(driver)
860
861 /**
862 * module_scmi_driver() - Helper macro for registering a scmi driver
863 * @__scmi_driver: scmi_driver structure
864 *
865 * Helper macro for scmi drivers to set up proper module init / exit
866 * functions. Replaces module_init() and module_exit() and keeps people from
867 * printing pointless things to the kernel log when their driver is loaded.
868 */
869 #define module_scmi_driver(__scmi_driver) \
870 module_driver(__scmi_driver, scmi_register, scmi_unregister)
871
872 /**
873 * module_scmi_protocol() - Helper macro for registering a scmi protocol
874 * @__scmi_protocol: scmi_protocol structure
875 *
876 * Helper macro for scmi drivers to set up proper module init / exit
877 * functions. Replaces module_init() and module_exit() and keeps people from
878 * printing pointless things to the kernel log when their driver is loaded.
879 */
880 #define module_scmi_protocol(__scmi_protocol) \
881 module_driver(__scmi_protocol, \
882 scmi_protocol_register, scmi_protocol_unregister)
883
884 struct scmi_protocol;
885 int scmi_protocol_register(const struct scmi_protocol *proto);
886 void scmi_protocol_unregister(const struct scmi_protocol *proto);
887
888 /* SCMI Notification API - Custom Event Reports */
889 enum scmi_notification_events {
890 SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
891 SCMI_EVENT_CLOCK_RATE_CHANGED = 0x0,
892 SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED = 0x1,
893 SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
894 SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
895 SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
896 SCMI_EVENT_SENSOR_UPDATE = 0x1,
897 SCMI_EVENT_RESET_ISSUED = 0x0,
898 SCMI_EVENT_BASE_ERROR_EVENT = 0x0,
899 SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER = 0x0,
900 SCMI_EVENT_POWERCAP_CAP_CHANGED = 0x0,
901 SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED = 0x1,
902 };
903
904 struct scmi_power_state_changed_report {
905 ktime_t timestamp;
906 unsigned int agent_id;
907 unsigned int domain_id;
908 unsigned int power_state;
909 };
910
911 struct scmi_clock_rate_notif_report {
912 ktime_t timestamp;
913 unsigned int agent_id;
914 unsigned int clock_id;
915 unsigned long long rate;
916 };
917
918 struct scmi_system_power_state_notifier_report {
919 ktime_t timestamp;
920 unsigned int agent_id;
921 #define SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(flags) ((flags) & BIT(0))
922 unsigned int flags;
923 unsigned int system_state;
924 unsigned int timeout;
925 };
926
927 struct scmi_perf_limits_report {
928 ktime_t timestamp;
929 unsigned int agent_id;
930 unsigned int domain_id;
931 unsigned int range_max;
932 unsigned int range_min;
933 };
934
935 struct scmi_perf_level_report {
936 ktime_t timestamp;
937 unsigned int agent_id;
938 unsigned int domain_id;
939 unsigned int performance_level;
940 };
941
942 struct scmi_sensor_trip_point_report {
943 ktime_t timestamp;
944 unsigned int agent_id;
945 unsigned int sensor_id;
946 unsigned int trip_point_desc;
947 };
948
949 struct scmi_sensor_update_report {
950 ktime_t timestamp;
951 unsigned int agent_id;
952 unsigned int sensor_id;
953 unsigned int readings_count;
954 struct scmi_sensor_reading readings[];
955 };
956
957 struct scmi_reset_issued_report {
958 ktime_t timestamp;
959 unsigned int agent_id;
960 unsigned int domain_id;
961 unsigned int reset_state;
962 };
963
964 struct scmi_base_error_report {
965 ktime_t timestamp;
966 unsigned int agent_id;
967 bool fatal;
968 unsigned int cmd_count;
969 unsigned long long reports[];
970 };
971
972 struct scmi_powercap_cap_changed_report {
973 ktime_t timestamp;
974 unsigned int agent_id;
975 unsigned int domain_id;
976 unsigned int power_cap;
977 unsigned int pai;
978 };
979
980 struct scmi_powercap_meas_changed_report {
981 ktime_t timestamp;
982 unsigned int agent_id;
983 unsigned int domain_id;
984 unsigned int power;
985 };
986 #endif /* _LINUX_SCMI_PROTOCOL_H */
987
