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  * @cap_set: set the CAP value for the specified domain to the provided value;
633  *	     if the domain supports setting the CAP with an asynchronous command
634  *	     this request will finally trigger an asynchronous transfer, but, if
635  *	     @ignore_dresp here is set to true, this call will anyway return
636  *	     immediately without waiting for the related delayed response.
637  * @pai_get: get the current PAI value for the specified domain.
638  * @pai_set: set the PAI value for the specified domain to the provided value.
639  * @measurements_get: retrieve the current average power measurements for the
640  *		      specified domain and the related PAI upon which is
641  *		      calculated.
642  * @measurements_threshold_set: set the desired low and high power thresholds
643  *				to be used when registering for notification
644  *				of type POWERCAP_MEASUREMENTS_NOTIFY with this
645  *				powercap domain.
646  *				Note that this must be called at least once
647  *				before registering any callback with the usual
648  *				@scmi_notify_ops; moreover, in case this method
649  *				is called with measurement notifications already
650  *				enabled it will also trigger, transparently, a
651  *				proper update of the power thresholds configured
652  *				in the SCMI backend server.
653  * @measurements_threshold_get: get the currently configured low and high power
654  *				thresholds used when registering callbacks for
655  *				notification POWERCAP_MEASUREMENTS_NOTIFY.
656  */
657 struct scmi_powercap_proto_ops {
658 	int (*num_domains_get)(const struct scmi_protocol_handle *ph);
659 	const struct scmi_powercap_info __must_check *(*info_get)
660 		(const struct scmi_protocol_handle *ph, u32 domain_id);
661 	int (*cap_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
662 		       u32 *power_cap);
663 	int (*cap_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
664 		       u32 power_cap, bool ignore_dresp);
665 	int (*pai_get)(const struct scmi_protocol_handle *ph, u32 domain_id,
666 		       u32 *pai);
667 	int (*pai_set)(const struct scmi_protocol_handle *ph, u32 domain_id,
668 		       u32 pai);
669 	int (*measurements_get)(const struct scmi_protocol_handle *ph,
670 				u32 domain_id, u32 *average_power, u32 *pai);
671 	int (*measurements_threshold_set)(const struct scmi_protocol_handle *ph,
672 					  u32 domain_id, u32 power_thresh_low,
673 					  u32 power_thresh_high);
674 	int (*measurements_threshold_get)(const struct scmi_protocol_handle *ph,
675 					  u32 domain_id, u32 *power_thresh_low,
676 					  u32 *power_thresh_high);
677 };
678 
679 /**
680  * struct scmi_notify_ops  - represents notifications' operations provided by
681  * SCMI core
682  * @devm_event_notifier_register: Managed registration of a notifier_block for
683  *				  the requested event
684  * @devm_event_notifier_unregister: Managed unregistration of a notifier_block
685  *				    for the requested event
686  * @event_notifier_register: Register a notifier_block for the requested event
687  * @event_notifier_unregister: Unregister a notifier_block for the requested
688  *			       event
689  *
690  * A user can register/unregister its own notifier_block against the wanted
691  * platform instance regarding the desired event identified by the
692  * tuple: (proto_id, evt_id, src_id) using the provided register/unregister
693  * interface where:
694  *
695  * @sdev: The scmi_device to use when calling the devres managed ops devm_
696  * @handle: The handle identifying the platform instance to use, when not
697  *	    calling the managed ops devm_
698  * @proto_id: The protocol ID as in SCMI Specification
699  * @evt_id: The message ID of the desired event as in SCMI Specification
700  * @src_id: A pointer to the desired source ID if different sources are
701  *	    possible for the protocol (like domain_id, sensor_id...etc)
702  *
703  * @src_id can be provided as NULL if it simply does NOT make sense for
704  * the protocol at hand, OR if the user is explicitly interested in
705  * receiving notifications from ANY existent source associated to the
706  * specified proto_id / evt_id.
707  *
708  * Received notifications are finally delivered to the registered users,
709  * invoking the callback provided with the notifier_block *nb as follows:
710  *
711  *	int user_cb(nb, evt_id, report)
712  *
713  * with:
714  *
715  * @nb: The notifier block provided by the user
716  * @evt_id: The message ID of the delivered event
717  * @report: A custom struct describing the specific event delivered
718  */
719 struct scmi_notify_ops {
720 	int (*devm_event_notifier_register)(struct scmi_device *sdev,
721 					    u8 proto_id, u8 evt_id,
722 					    const u32 *src_id,
723 					    struct notifier_block *nb);
724 	int (*devm_event_notifier_unregister)(struct scmi_device *sdev,
725 					      u8 proto_id, u8 evt_id,
726 					      const u32 *src_id,
727 					      struct notifier_block *nb);
728 	int (*event_notifier_register)(const struct scmi_handle *handle,
729 				       u8 proto_id, u8 evt_id,
730 				       const u32 *src_id,
731 				       struct notifier_block *nb);
732 	int (*event_notifier_unregister)(const struct scmi_handle *handle,
733 					 u8 proto_id, u8 evt_id,
734 					 const u32 *src_id,
735 					 struct notifier_block *nb);
736 };
737 
738 /**
739  * struct scmi_handle - Handle returned to ARM SCMI clients for usage.
740  *
741  * @dev: pointer to the SCMI device
742  * @version: pointer to the structure containing SCMI version information
743  * @devm_protocol_acquire: devres managed method to get hold of a protocol,
744  *			   causing its initialization and related resource
745  *			   accounting
746  * @devm_protocol_get: devres managed method to acquire a protocol and get specific
747  *		       operations and a dedicated protocol handler
748  * @devm_protocol_put: devres managed method to release a protocol
749  * @is_transport_atomic: method to check if the underlying transport for this
750  *			 instance handle is configured to support atomic
751  *			 transactions for commands.
752  *			 Some users of the SCMI stack in the upper layers could
753  *			 be interested to know if they can assume SCMI
754  *			 command transactions associated to this handle will
755  *			 never sleep and act accordingly.
756  *			 An optional atomic threshold value could be returned
757  *			 where configured.
758  * @notify_ops: pointer to set of notifications related operations
759  */
760 struct scmi_handle {
761 	struct device *dev;
762 	struct scmi_revision_info *version;
763 
764 	int __must_check (*devm_protocol_acquire)(struct scmi_device *sdev,
765 						  u8 proto);
766 	const void __must_check *
767 		(*devm_protocol_get)(struct scmi_device *sdev, u8 proto,
768 				     struct scmi_protocol_handle **ph);
769 	void (*devm_protocol_put)(struct scmi_device *sdev, u8 proto);
770 	bool (*is_transport_atomic)(const struct scmi_handle *handle,
771 				    unsigned int *atomic_threshold);
772 
773 	const struct scmi_notify_ops *notify_ops;
774 };
775 
776 enum scmi_std_protocol {
777 	SCMI_PROTOCOL_BASE = 0x10,
778 	SCMI_PROTOCOL_POWER = 0x11,
779 	SCMI_PROTOCOL_SYSTEM = 0x12,
780 	SCMI_PROTOCOL_PERF = 0x13,
781 	SCMI_PROTOCOL_CLOCK = 0x14,
782 	SCMI_PROTOCOL_SENSOR = 0x15,
783 	SCMI_PROTOCOL_RESET = 0x16,
784 	SCMI_PROTOCOL_VOLTAGE = 0x17,
785 	SCMI_PROTOCOL_POWERCAP = 0x18,
786 };
787 
788 enum scmi_system_events {
789 	SCMI_SYSTEM_SHUTDOWN,
790 	SCMI_SYSTEM_COLDRESET,
791 	SCMI_SYSTEM_WARMRESET,
792 	SCMI_SYSTEM_POWERUP,
793 	SCMI_SYSTEM_SUSPEND,
794 	SCMI_SYSTEM_MAX
795 };
796 
797 struct scmi_device {
798 	u32 id;
799 	u8 protocol_id;
800 	const char *name;
801 	struct device dev;
802 	struct scmi_handle *handle;
803 };
804 
805 #define to_scmi_dev(d) container_of(d, struct scmi_device, dev)
806 
807 struct scmi_device *
808 scmi_device_create(struct device_node *np, struct device *parent, int protocol,
809 		   const char *name);
810 void scmi_device_destroy(struct scmi_device *scmi_dev);
811 
812 struct scmi_device_id {
813 	u8 protocol_id;
814 	const char *name;
815 };
816 
817 struct scmi_driver {
818 	const char *name;
819 	int (*probe)(struct scmi_device *sdev);
820 	void (*remove)(struct scmi_device *sdev);
821 	const struct scmi_device_id *id_table;
822 
823 	struct device_driver driver;
824 };
825 
826 #define to_scmi_driver(d) container_of(d, struct scmi_driver, driver)
827 
828 #if IS_REACHABLE(CONFIG_ARM_SCMI_PROTOCOL)
829 int scmi_driver_register(struct scmi_driver *driver,
830 			 struct module *owner, const char *mod_name);
831 void scmi_driver_unregister(struct scmi_driver *driver);
832 #else
833 static inline int
scmi_driver_register(struct scmi_driver * driver,struct module * owner,const char * mod_name)834 scmi_driver_register(struct scmi_driver *driver, struct module *owner,
835 		     const char *mod_name)
836 {
837 	return -EINVAL;
838 }
839 
scmi_driver_unregister(struct scmi_driver * driver)840 static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
841 #endif /* CONFIG_ARM_SCMI_PROTOCOL */
842 
843 #define scmi_register(driver) \
844 	scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
845 #define scmi_unregister(driver) \
846 	scmi_driver_unregister(driver)
847 
848 /**
849  * module_scmi_driver() - Helper macro for registering a scmi driver
850  * @__scmi_driver: scmi_driver structure
851  *
852  * Helper macro for scmi drivers to set up proper module init / exit
853  * functions.  Replaces module_init() and module_exit() and keeps people from
854  * printing pointless things to the kernel log when their driver is loaded.
855  */
856 #define module_scmi_driver(__scmi_driver)	\
857 	module_driver(__scmi_driver, scmi_register, scmi_unregister)
858 
859 /**
860  * module_scmi_protocol() - Helper macro for registering a scmi protocol
861  * @__scmi_protocol: scmi_protocol structure
862  *
863  * Helper macro for scmi drivers to set up proper module init / exit
864  * functions.  Replaces module_init() and module_exit() and keeps people from
865  * printing pointless things to the kernel log when their driver is loaded.
866  */
867 #define module_scmi_protocol(__scmi_protocol)	\
868 	module_driver(__scmi_protocol,		\
869 		      scmi_protocol_register, scmi_protocol_unregister)
870 
871 struct scmi_protocol;
872 int scmi_protocol_register(const struct scmi_protocol *proto);
873 void scmi_protocol_unregister(const struct scmi_protocol *proto);
874 
875 /* SCMI Notification API - Custom Event Reports */
876 enum scmi_notification_events {
877 	SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
878 	SCMI_EVENT_CLOCK_RATE_CHANGED = 0x0,
879 	SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED = 0x1,
880 	SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
881 	SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
882 	SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
883 	SCMI_EVENT_SENSOR_UPDATE = 0x1,
884 	SCMI_EVENT_RESET_ISSUED = 0x0,
885 	SCMI_EVENT_BASE_ERROR_EVENT = 0x0,
886 	SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER = 0x0,
887 	SCMI_EVENT_POWERCAP_CAP_CHANGED = 0x0,
888 	SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED = 0x1,
889 };
890 
891 struct scmi_power_state_changed_report {
892 	ktime_t		timestamp;
893 	unsigned int	agent_id;
894 	unsigned int	domain_id;
895 	unsigned int	power_state;
896 };
897 
898 struct scmi_clock_rate_notif_report {
899 	ktime_t			timestamp;
900 	unsigned int		agent_id;
901 	unsigned int		clock_id;
902 	unsigned long long	rate;
903 };
904 
905 struct scmi_system_power_state_notifier_report {
906 	ktime_t		timestamp;
907 	unsigned int	agent_id;
908 #define SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(flags)	((flags) & BIT(0))
909 	unsigned int	flags;
910 	unsigned int	system_state;
911 	unsigned int	timeout;
912 };
913 
914 struct scmi_perf_limits_report {
915 	ktime_t		timestamp;
916 	unsigned int	agent_id;
917 	unsigned int	domain_id;
918 	unsigned int	range_max;
919 	unsigned int	range_min;
920 };
921 
922 struct scmi_perf_level_report {
923 	ktime_t		timestamp;
924 	unsigned int	agent_id;
925 	unsigned int	domain_id;
926 	unsigned int	performance_level;
927 };
928 
929 struct scmi_sensor_trip_point_report {
930 	ktime_t		timestamp;
931 	unsigned int	agent_id;
932 	unsigned int	sensor_id;
933 	unsigned int	trip_point_desc;
934 };
935 
936 struct scmi_sensor_update_report {
937 	ktime_t				timestamp;
938 	unsigned int			agent_id;
939 	unsigned int			sensor_id;
940 	unsigned int			readings_count;
941 	struct scmi_sensor_reading	readings[];
942 };
943 
944 struct scmi_reset_issued_report {
945 	ktime_t		timestamp;
946 	unsigned int	agent_id;
947 	unsigned int	domain_id;
948 	unsigned int	reset_state;
949 };
950 
951 struct scmi_base_error_report {
952 	ktime_t			timestamp;
953 	unsigned int		agent_id;
954 	bool			fatal;
955 	unsigned int		cmd_count;
956 	unsigned long long	reports[];
957 };
958 
959 struct scmi_powercap_cap_changed_report {
960 	ktime_t		timestamp;
961 	unsigned int	agent_id;
962 	unsigned int	domain_id;
963 	unsigned int	power_cap;
964 	unsigned int	pai;
965 };
966 
967 struct scmi_powercap_meas_changed_report {
968 	ktime_t		timestamp;
969 	unsigned int	agent_id;
970 	unsigned int	domain_id;
971 	unsigned int	power;
972 };
973 #endif /* _LINUX_SCMI_PROTOCOL_H */
974