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 struct scmi_perf_domain_info { 101 char name[SCMI_MAX_STR_SIZE]; 102 bool set_perf; 103 }; 104 105 /** 106 * struct scmi_perf_proto_ops - represents the various operations provided 107 * by SCMI Performance Protocol 108 * 109 * @num_domains_get: gets the number of supported performance domains 110 * @info_get: get the information of a performance domain 111 * @limits_set: sets limits on the performance level of a domain 112 * @limits_get: gets limits on the performance level of a domain 113 * @level_set: sets the performance level of a domain 114 * @level_get: gets the performance level of a domain 115 * @device_domain_id: gets the scmi domain id for a given device 116 * @transition_latency_get: gets the DVFS transition latency for a given device 117 * @device_opps_add: adds all the OPPs for a given device 118 * @freq_set: sets the frequency for a given device using sustained frequency 119 * to sustained performance level mapping 120 * @freq_get: gets the frequency for a given device using sustained frequency 121 * to sustained performance level mapping 122 * @est_power_get: gets the estimated power cost for a given performance domain 123 * at a given frequency 124 * @fast_switch_possible: indicates if fast DVFS switching is possible or not 125 * for a given device 126 * @power_scale_mw_get: indicates if the power values provided are in milliWatts 127 * or in some other (abstract) scale 128 */ 129 struct scmi_perf_proto_ops { 130 int (*num_domains_get)(const struct scmi_protocol_handle *ph); 131 const struct scmi_perf_domain_info __must_check *(*info_get) 132 (const struct scmi_protocol_handle *ph, u32 domain); 133 int (*limits_set)(const struct scmi_protocol_handle *ph, u32 domain, 134 u32 max_perf, u32 min_perf); 135 int (*limits_get)(const struct scmi_protocol_handle *ph, u32 domain, 136 u32 *max_perf, u32 *min_perf); 137 int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain, 138 u32 level, bool poll); 139 int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain, 140 u32 *level, bool poll); 141 int (*device_domain_id)(struct device *dev); 142 int (*transition_latency_get)(const struct scmi_protocol_handle *ph, 143 struct device *dev); 144 int (*device_opps_add)(const struct scmi_protocol_handle *ph, 145 struct device *dev); 146 int (*freq_set)(const struct scmi_protocol_handle *ph, u32 domain, 147 unsigned long rate, bool poll); 148 int (*freq_get)(const struct scmi_protocol_handle *ph, u32 domain, 149 unsigned long *rate, bool poll); 150 int (*est_power_get)(const struct scmi_protocol_handle *ph, u32 domain, 151 unsigned long *rate, unsigned long *power); 152 bool (*fast_switch_possible)(const struct scmi_protocol_handle *ph, 153 struct device *dev); 154 enum scmi_power_scale (*power_scale_get)(const struct scmi_protocol_handle *ph); 155 }; 156 157 /** 158 * struct scmi_power_proto_ops - represents the various operations provided 159 * by SCMI Power Protocol 160 * 161 * @num_domains_get: get the count of power domains provided by SCMI 162 * @name_get: gets the name of a power domain 163 * @state_set: sets the power state of a power domain 164 * @state_get: gets the power state of a power domain 165 */ 166 struct scmi_power_proto_ops { 167 int (*num_domains_get)(const struct scmi_protocol_handle *ph); 168 const char *(*name_get)(const struct scmi_protocol_handle *ph, 169 u32 domain); 170 #define SCMI_POWER_STATE_TYPE_SHIFT 30 171 #define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1) 172 #define SCMI_POWER_STATE_PARAM(type, id) \ 173 ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \ 174 ((id) & SCMI_POWER_STATE_ID_MASK)) 175 #define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0) 176 #define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0) 177 int (*state_set)(const struct scmi_protocol_handle *ph, u32 domain, 178 u32 state); 179 int (*state_get)(const struct scmi_protocol_handle *ph, u32 domain, 180 u32 *state); 181 }; 182 183 /** 184 * struct scmi_sensor_reading - represent a timestamped read 185 * 186 * Used by @reading_get_timestamped method. 187 * 188 * @value: The signed value sensor read. 189 * @timestamp: An unsigned timestamp for the sensor read, as provided by 190 * SCMI platform. Set to zero when not available. 191 */ 192 struct scmi_sensor_reading { 193 long long value; 194 unsigned long long timestamp; 195 }; 196 197 /** 198 * struct scmi_range_attrs - specifies a sensor or axis values' range 199 * @min_range: The minimum value which can be represented by the sensor/axis. 200 * @max_range: The maximum value which can be represented by the sensor/axis. 201 */ 202 struct scmi_range_attrs { 203 long long min_range; 204 long long max_range; 205 }; 206 207 /** 208 * struct scmi_sensor_axis_info - describes one sensor axes 209 * @id: The axes ID. 210 * @type: Axes type. Chosen amongst one of @enum scmi_sensor_class. 211 * @scale: Power-of-10 multiplier applied to the axis unit. 212 * @name: NULL-terminated string representing axes name as advertised by 213 * SCMI platform. 214 * @extended_attrs: Flag to indicate the presence of additional extended 215 * attributes for this axes. 216 * @resolution: Extended attribute representing the resolution of the axes. 217 * Set to 0 if not reported by this axes. 218 * @exponent: Extended attribute representing the power-of-10 multiplier that 219 * is applied to the resolution field. Set to 0 if not reported by 220 * this axes. 221 * @attrs: Extended attributes representing minimum and maximum values 222 * measurable by this axes. Set to 0 if not reported by this sensor. 223 */ 224 struct scmi_sensor_axis_info { 225 unsigned int id; 226 unsigned int type; 227 int scale; 228 char name[SCMI_MAX_STR_SIZE]; 229 bool extended_attrs; 230 unsigned int resolution; 231 int exponent; 232 struct scmi_range_attrs attrs; 233 }; 234 235 /** 236 * struct scmi_sensor_intervals_info - describes number and type of available 237 * update intervals 238 * @segmented: Flag for segmented intervals' representation. When True there 239 * will be exactly 3 intervals in @desc, with each entry 240 * representing a member of a segment in this order: 241 * {lowest update interval, highest update interval, step size} 242 * @count: Number of intervals described in @desc. 243 * @desc: Array of @count interval descriptor bitmask represented as detailed in 244 * the SCMI specification: it can be accessed using the accompanying 245 * macros. 246 * @prealloc_pool: A minimal preallocated pool of desc entries used to avoid 247 * lesser-than-64-bytes dynamic allocation for small @count 248 * values. 249 */ 250 struct scmi_sensor_intervals_info { 251 bool segmented; 252 unsigned int count; 253 #define SCMI_SENS_INTVL_SEGMENT_LOW 0 254 #define SCMI_SENS_INTVL_SEGMENT_HIGH 1 255 #define SCMI_SENS_INTVL_SEGMENT_STEP 2 256 unsigned int *desc; 257 #define SCMI_SENS_INTVL_GET_SECS(x) FIELD_GET(GENMASK(20, 5), (x)) 258 #define SCMI_SENS_INTVL_GET_EXP(x) \ 259 ({ \ 260 int __signed_exp = FIELD_GET(GENMASK(4, 0), (x)); \ 261 \ 262 if (__signed_exp & BIT(4)) \ 263 __signed_exp |= GENMASK(31, 5); \ 264 __signed_exp; \ 265 }) 266 #define SCMI_MAX_PREALLOC_POOL 16 267 unsigned int prealloc_pool[SCMI_MAX_PREALLOC_POOL]; 268 }; 269 270 /** 271 * struct scmi_sensor_info - represents information related to one of the 272 * available sensors. 273 * @id: Sensor ID. 274 * @type: Sensor type. Chosen amongst one of @enum scmi_sensor_class. 275 * @scale: Power-of-10 multiplier applied to the sensor unit. 276 * @num_trip_points: Number of maximum configurable trip points. 277 * @async: Flag for asynchronous read support. 278 * @update: Flag for continuouos update notification support. 279 * @timestamped: Flag for timestamped read support. 280 * @tstamp_scale: Power-of-10 multiplier applied to the sensor timestamps to 281 * represent it in seconds. 282 * @num_axis: Number of supported axis if any. Reported as 0 for scalar sensors. 283 * @axis: Pointer to an array of @num_axis descriptors. 284 * @intervals: Descriptor of available update intervals. 285 * @sensor_config: A bitmask reporting the current sensor configuration as 286 * detailed in the SCMI specification: it can accessed and 287 * modified through the accompanying macros. 288 * @name: NULL-terminated string representing sensor name as advertised by 289 * SCMI platform. 290 * @extended_scalar_attrs: Flag to indicate the presence of additional extended 291 * attributes for this sensor. 292 * @sensor_power: Extended attribute representing the average power 293 * consumed by the sensor in microwatts (uW) when it is active. 294 * Reported here only for scalar sensors. 295 * Set to 0 if not reported by this sensor. 296 * @resolution: Extended attribute representing the resolution of the sensor. 297 * Reported here only for scalar sensors. 298 * Set to 0 if not reported by this sensor. 299 * @exponent: Extended attribute representing the power-of-10 multiplier that is 300 * applied to the resolution field. 301 * Reported here only for scalar sensors. 302 * Set to 0 if not reported by this sensor. 303 * @scalar_attrs: Extended attributes representing minimum and maximum 304 * measurable values by this sensor. 305 * Reported here only for scalar sensors. 306 * Set to 0 if not reported by this sensor. 307 */ 308 struct scmi_sensor_info { 309 unsigned int id; 310 unsigned int type; 311 int scale; 312 unsigned int num_trip_points; 313 bool async; 314 bool update; 315 bool timestamped; 316 int tstamp_scale; 317 unsigned int num_axis; 318 struct scmi_sensor_axis_info *axis; 319 struct scmi_sensor_intervals_info intervals; 320 unsigned int sensor_config; 321 #define SCMI_SENS_CFG_UPDATE_SECS_MASK GENMASK(31, 16) 322 #define SCMI_SENS_CFG_GET_UPDATE_SECS(x) \ 323 FIELD_GET(SCMI_SENS_CFG_UPDATE_SECS_MASK, (x)) 324 325 #define SCMI_SENS_CFG_UPDATE_EXP_MASK GENMASK(15, 11) 326 #define SCMI_SENS_CFG_GET_UPDATE_EXP(x) \ 327 ({ \ 328 int __signed_exp = \ 329 FIELD_GET(SCMI_SENS_CFG_UPDATE_EXP_MASK, (x)); \ 330 \ 331 if (__signed_exp & BIT(4)) \ 332 __signed_exp |= GENMASK(31, 5); \ 333 __signed_exp; \ 334 }) 335 336 #define SCMI_SENS_CFG_ROUND_MASK GENMASK(10, 9) 337 #define SCMI_SENS_CFG_ROUND_AUTO 2 338 #define SCMI_SENS_CFG_ROUND_UP 1 339 #define SCMI_SENS_CFG_ROUND_DOWN 0 340 341 #define SCMI_SENS_CFG_TSTAMP_ENABLED_MASK BIT(1) 342 #define SCMI_SENS_CFG_TSTAMP_ENABLE 1 343 #define SCMI_SENS_CFG_TSTAMP_DISABLE 0 344 #define SCMI_SENS_CFG_IS_TSTAMP_ENABLED(x) \ 345 FIELD_GET(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, (x)) 346 347 #define SCMI_SENS_CFG_SENSOR_ENABLED_MASK BIT(0) 348 #define SCMI_SENS_CFG_SENSOR_ENABLE 1 349 #define SCMI_SENS_CFG_SENSOR_DISABLE 0 350 char name[SCMI_MAX_STR_SIZE]; 351 #define SCMI_SENS_CFG_IS_ENABLED(x) FIELD_GET(BIT(0), (x)) 352 bool extended_scalar_attrs; 353 unsigned int sensor_power; 354 unsigned int resolution; 355 int exponent; 356 struct scmi_range_attrs scalar_attrs; 357 }; 358 359 /* 360 * Partial list from Distributed Management Task Force (DMTF) specification: 361 * DSP0249 (Platform Level Data Model specification) 362 */ 363 enum scmi_sensor_class { 364 NONE = 0x0, 365 UNSPEC = 0x1, 366 TEMPERATURE_C = 0x2, 367 TEMPERATURE_F = 0x3, 368 TEMPERATURE_K = 0x4, 369 VOLTAGE = 0x5, 370 CURRENT = 0x6, 371 POWER = 0x7, 372 ENERGY = 0x8, 373 CHARGE = 0x9, 374 VOLTAMPERE = 0xA, 375 NITS = 0xB, 376 LUMENS = 0xC, 377 LUX = 0xD, 378 CANDELAS = 0xE, 379 KPA = 0xF, 380 PSI = 0x10, 381 NEWTON = 0x11, 382 CFM = 0x12, 383 RPM = 0x13, 384 HERTZ = 0x14, 385 SECS = 0x15, 386 MINS = 0x16, 387 HOURS = 0x17, 388 DAYS = 0x18, 389 WEEKS = 0x19, 390 MILS = 0x1A, 391 INCHES = 0x1B, 392 FEET = 0x1C, 393 CUBIC_INCHES = 0x1D, 394 CUBIC_FEET = 0x1E, 395 METERS = 0x1F, 396 CUBIC_CM = 0x20, 397 CUBIC_METERS = 0x21, 398 LITERS = 0x22, 399 FLUID_OUNCES = 0x23, 400 RADIANS = 0x24, 401 STERADIANS = 0x25, 402 REVOLUTIONS = 0x26, 403 CYCLES = 0x27, 404 GRAVITIES = 0x28, 405 OUNCES = 0x29, 406 POUNDS = 0x2A, 407 FOOT_POUNDS = 0x2B, 408 OUNCE_INCHES = 0x2C, 409 GAUSS = 0x2D, 410 GILBERTS = 0x2E, 411 HENRIES = 0x2F, 412 FARADS = 0x30, 413 OHMS = 0x31, 414 SIEMENS = 0x32, 415 MOLES = 0x33, 416 BECQUERELS = 0x34, 417 PPM = 0x35, 418 DECIBELS = 0x36, 419 DBA = 0x37, 420 DBC = 0x38, 421 GRAYS = 0x39, 422 SIEVERTS = 0x3A, 423 COLOR_TEMP_K = 0x3B, 424 BITS = 0x3C, 425 BYTES = 0x3D, 426 WORDS = 0x3E, 427 DWORDS = 0x3F, 428 QWORDS = 0x40, 429 PERCENTAGE = 0x41, 430 PASCALS = 0x42, 431 COUNTS = 0x43, 432 GRAMS = 0x44, 433 NEWTON_METERS = 0x45, 434 HITS = 0x46, 435 MISSES = 0x47, 436 RETRIES = 0x48, 437 OVERRUNS = 0x49, 438 UNDERRUNS = 0x4A, 439 COLLISIONS = 0x4B, 440 PACKETS = 0x4C, 441 MESSAGES = 0x4D, 442 CHARS = 0x4E, 443 ERRORS = 0x4F, 444 CORRECTED_ERRS = 0x50, 445 UNCORRECTABLE_ERRS = 0x51, 446 SQ_MILS = 0x52, 447 SQ_INCHES = 0x53, 448 SQ_FEET = 0x54, 449 SQ_CM = 0x55, 450 SQ_METERS = 0x56, 451 RADIANS_SEC = 0x57, 452 BPM = 0x58, 453 METERS_SEC_SQUARED = 0x59, 454 METERS_SEC = 0x5A, 455 CUBIC_METERS_SEC = 0x5B, 456 MM_MERCURY = 0x5C, 457 RADIANS_SEC_SQUARED = 0x5D, 458 OEM_UNIT = 0xFF 459 }; 460 461 /** 462 * struct scmi_sensor_proto_ops - represents the various operations provided 463 * by SCMI Sensor Protocol 464 * 465 * @count_get: get the count of sensors provided by SCMI 466 * @info_get: get the information of the specified sensor 467 * @trip_point_config: selects and configures a trip-point of interest 468 * @reading_get: gets the current value of the sensor 469 * @reading_get_timestamped: gets the current value and timestamp, when 470 * available, of the sensor. (as of v3.0 spec) 471 * Supports multi-axis sensors for sensors which 472 * supports it and if the @reading array size of 473 * @count entry equals the sensor num_axis 474 * @config_get: Get sensor current configuration 475 * @config_set: Set sensor current configuration 476 */ 477 struct scmi_sensor_proto_ops { 478 int (*count_get)(const struct scmi_protocol_handle *ph); 479 const struct scmi_sensor_info __must_check *(*info_get) 480 (const struct scmi_protocol_handle *ph, u32 sensor_id); 481 int (*trip_point_config)(const struct scmi_protocol_handle *ph, 482 u32 sensor_id, u8 trip_id, u64 trip_value); 483 int (*reading_get)(const struct scmi_protocol_handle *ph, u32 sensor_id, 484 u64 *value); 485 int (*reading_get_timestamped)(const struct scmi_protocol_handle *ph, 486 u32 sensor_id, u8 count, 487 struct scmi_sensor_reading *readings); 488 int (*config_get)(const struct scmi_protocol_handle *ph, 489 u32 sensor_id, u32 *sensor_config); 490 int (*config_set)(const struct scmi_protocol_handle *ph, 491 u32 sensor_id, u32 sensor_config); 492 }; 493 494 /** 495 * struct scmi_reset_proto_ops - represents the various operations provided 496 * by SCMI Reset Protocol 497 * 498 * @num_domains_get: get the count of reset domains provided by SCMI 499 * @name_get: gets the name of a reset domain 500 * @latency_get: gets the reset latency for the specified reset domain 501 * @reset: resets the specified reset domain 502 * @assert: explicitly assert reset signal of the specified reset domain 503 * @deassert: explicitly deassert reset signal of the specified reset domain 504 */ 505 struct scmi_reset_proto_ops { 506 int (*num_domains_get)(const struct scmi_protocol_handle *ph); 507 const char *(*name_get)(const struct scmi_protocol_handle *ph, 508 u32 domain); 509 int (*latency_get)(const struct scmi_protocol_handle *ph, u32 domain); 510 int (*reset)(const struct scmi_protocol_handle *ph, u32 domain); 511 int (*assert)(const struct scmi_protocol_handle *ph, u32 domain); 512 int (*deassert)(const struct scmi_protocol_handle *ph, u32 domain); 513 }; 514 515 enum scmi_voltage_level_mode { 516 SCMI_VOLTAGE_LEVEL_SET_AUTO, 517 SCMI_VOLTAGE_LEVEL_SET_SYNC, 518 }; 519 520 /** 521 * struct scmi_voltage_info - describe one available SCMI Voltage Domain 522 * 523 * @id: the domain ID as advertised by the platform 524 * @segmented: defines the layout of the entries of array @levels_uv. 525 * - when True the entries are to be interpreted as triplets, 526 * each defining a segment representing a range of equally 527 * space voltages: <lowest_volts>, <highest_volt>, <step_uV> 528 * - when False the entries simply represent a single discrete 529 * supported voltage level 530 * @negative_volts_allowed: True if any of the entries of @levels_uv represent 531 * a negative voltage. 532 * @async_level_set: True when the voltage domain supports asynchronous level 533 * set commands. 534 * @name: name assigned to the Voltage Domain by platform 535 * @num_levels: number of total entries in @levels_uv. 536 * @levels_uv: array of entries describing the available voltage levels for 537 * this domain. 538 */ 539 struct scmi_voltage_info { 540 unsigned int id; 541 bool segmented; 542 bool negative_volts_allowed; 543 bool async_level_set; 544 char name[SCMI_MAX_STR_SIZE]; 545 unsigned int num_levels; 546 #define SCMI_VOLTAGE_SEGMENT_LOW 0 547 #define SCMI_VOLTAGE_SEGMENT_HIGH 1 548 #define SCMI_VOLTAGE_SEGMENT_STEP 2 549 int *levels_uv; 550 }; 551 552 /** 553 * struct scmi_voltage_proto_ops - represents the various operations provided 554 * by SCMI Voltage Protocol 555 * 556 * @num_domains_get: get the count of voltage domains provided by SCMI 557 * @info_get: get the information of the specified domain 558 * @config_set: set the config for the specified domain 559 * @config_get: get the config of the specified domain 560 * @level_set: set the voltage level for the specified domain 561 * @level_get: get the voltage level of the specified domain 562 */ 563 struct scmi_voltage_proto_ops { 564 int (*num_domains_get)(const struct scmi_protocol_handle *ph); 565 const struct scmi_voltage_info __must_check *(*info_get) 566 (const struct scmi_protocol_handle *ph, u32 domain_id); 567 int (*config_set)(const struct scmi_protocol_handle *ph, u32 domain_id, 568 u32 config); 569 #define SCMI_VOLTAGE_ARCH_STATE_OFF 0x0 570 #define SCMI_VOLTAGE_ARCH_STATE_ON 0x7 571 int (*config_get)(const struct scmi_protocol_handle *ph, u32 domain_id, 572 u32 *config); 573 int (*level_set)(const struct scmi_protocol_handle *ph, u32 domain_id, 574 enum scmi_voltage_level_mode mode, s32 volt_uV); 575 int (*level_get)(const struct scmi_protocol_handle *ph, u32 domain_id, 576 s32 *volt_uV); 577 }; 578 579 /** 580 * struct scmi_powercap_info - Describe one available Powercap domain 581 * 582 * @id: Domain ID as advertised by the platform. 583 * @notify_powercap_cap_change: CAP change notification support. 584 * @notify_powercap_measurement_change: MEASUREMENTS change notifications 585 * support. 586 * @async_powercap_cap_set: Asynchronous CAP set support. 587 * @powercap_cap_config: CAP configuration support. 588 * @powercap_monitoring: Monitoring (measurements) support. 589 * @powercap_pai_config: PAI configuration support. 590 * @powercap_scale_mw: Domain reports power data in milliwatt units. 591 * @powercap_scale_uw: Domain reports power data in microwatt units. 592 * Note that, when both @powercap_scale_mw and 593 * @powercap_scale_uw are set to false, the domain 594 * reports power data on an abstract linear scale. 595 * @name: name assigned to the Powercap Domain by platform. 596 * @min_pai: Minimum configurable PAI. 597 * @max_pai: Maximum configurable PAI. 598 * @pai_step: Step size between two consecutive PAI values. 599 * @min_power_cap: Minimum configurable CAP. 600 * @max_power_cap: Maximum configurable CAP. 601 * @power_cap_step: Step size between two consecutive CAP values. 602 * @sustainable_power: Maximum sustainable power consumption for this domain 603 * under normal conditions. 604 * @accuracy: The accuracy with which the power is measured and reported in 605 * integral multiples of 0.001 percent. 606 * @parent_id: Identifier of the containing parent power capping domain, or the 607 * value 0xFFFFFFFF if this powercap domain is a root domain not 608 * contained in any other domain. 609 */ 610 struct scmi_powercap_info { 611 unsigned int id; 612 bool notify_powercap_cap_change; 613 bool notify_powercap_measurement_change; 614 bool async_powercap_cap_set; 615 bool powercap_cap_config; 616 bool powercap_monitoring; 617 bool powercap_pai_config; 618 bool powercap_scale_mw; 619 bool powercap_scale_uw; 620 bool fastchannels; 621 char name[SCMI_MAX_STR_SIZE]; 622 unsigned int min_pai; 623 unsigned int max_pai; 624 unsigned int pai_step; 625 unsigned int min_power_cap; 626 unsigned int max_power_cap; 627 unsigned int power_cap_step; 628 unsigned int sustainable_power; 629 unsigned int accuracy; 630 #define SCMI_POWERCAP_ROOT_ZONE_ID 0xFFFFFFFFUL 631 unsigned int parent_id; 632 struct scmi_fc_info *fc_info; 633 }; 634 635 /** 636 * struct scmi_powercap_proto_ops - represents the various operations provided 637 * by SCMI Powercap Protocol 638 * 639 * @num_domains_get: get the count of powercap domains provided by SCMI. 640 * @info_get: get the information for the specified domain. 641 * @cap_get: get the current CAP value for the specified domain. 642 * On SCMI platforms supporting powercap zone disabling, this could 643 * report a zero value for a zone where powercapping is disabled. 644 * @cap_set: set the CAP value for the specified domain to the provided value; 645 * if the domain supports setting the CAP with an asynchronous command 646 * this request will finally trigger an asynchronous transfer, but, if 647 * @ignore_dresp here is set to true, this call will anyway return 648 * immediately without waiting for the related delayed response. 649 * Note that the powercap requested value must NOT be zero, even if 650 * the platform supports disabling a powercap by setting its cap to 651 * zero (since SCMI v3.2): there are dedicated operations that should 652 * be used for that. (@cap_enable_set/get) 653 * @cap_enable_set: enable or disable the powercapping on the specified domain, 654 * if supported by the SCMI platform implementation. 655 * Note that, by the SCMI specification, the platform can 656 * silently ignore our disable request and decide to enforce 657 * anyway some other powercap value requested by another agent 658 * on the system: for this reason @cap_get and @cap_enable_get 659 * will always report the final platform view of the powercaps. 660 * @cap_enable_get: get the current CAP enable status for the specified domain. 661 * @pai_get: get the current PAI value for the specified domain. 662 * @pai_set: set the PAI value for the specified domain to the provided value. 663 * @measurements_get: retrieve the current average power measurements for the 664 * specified domain and the related PAI upon which is 665 * calculated. 666 * @measurements_threshold_set: set the desired low and high power thresholds 667 * to be used when registering for notification 668 * of type POWERCAP_MEASUREMENTS_NOTIFY with this 669 * powercap domain. 670 * Note that this must be called at least once 671 * before registering any callback with the usual 672 * @scmi_notify_ops; moreover, in case this method 673 * is called with measurement notifications already 674 * enabled it will also trigger, transparently, a 675 * proper update of the power thresholds configured 676 * in the SCMI backend server. 677 * @measurements_threshold_get: get the currently configured low and high power 678 * thresholds used when registering callbacks for 679 * notification POWERCAP_MEASUREMENTS_NOTIFY. 680 */ 681 struct scmi_powercap_proto_ops { 682 int (*num_domains_get)(const struct scmi_protocol_handle *ph); 683 const struct scmi_powercap_info __must_check *(*info_get) 684 (const struct scmi_protocol_handle *ph, u32 domain_id); 685 int (*cap_get)(const struct scmi_protocol_handle *ph, u32 domain_id, 686 u32 *power_cap); 687 int (*cap_set)(const struct scmi_protocol_handle *ph, u32 domain_id, 688 u32 power_cap, bool ignore_dresp); 689 int (*cap_enable_set)(const struct scmi_protocol_handle *ph, 690 u32 domain_id, bool enable); 691 int (*cap_enable_get)(const struct scmi_protocol_handle *ph, 692 u32 domain_id, bool *enable); 693 int (*pai_get)(const struct scmi_protocol_handle *ph, u32 domain_id, 694 u32 *pai); 695 int (*pai_set)(const struct scmi_protocol_handle *ph, u32 domain_id, 696 u32 pai); 697 int (*measurements_get)(const struct scmi_protocol_handle *ph, 698 u32 domain_id, u32 *average_power, u32 *pai); 699 int (*measurements_threshold_set)(const struct scmi_protocol_handle *ph, 700 u32 domain_id, u32 power_thresh_low, 701 u32 power_thresh_high); 702 int (*measurements_threshold_get)(const struct scmi_protocol_handle *ph, 703 u32 domain_id, u32 *power_thresh_low, 704 u32 *power_thresh_high); 705 }; 706 707 /** 708 * struct scmi_notify_ops - represents notifications' operations provided by 709 * SCMI core 710 * @devm_event_notifier_register: Managed registration of a notifier_block for 711 * the requested event 712 * @devm_event_notifier_unregister: Managed unregistration of a notifier_block 713 * for the requested event 714 * @event_notifier_register: Register a notifier_block for the requested event 715 * @event_notifier_unregister: Unregister a notifier_block for the requested 716 * event 717 * 718 * A user can register/unregister its own notifier_block against the wanted 719 * platform instance regarding the desired event identified by the 720 * tuple: (proto_id, evt_id, src_id) using the provided register/unregister 721 * interface where: 722 * 723 * @sdev: The scmi_device to use when calling the devres managed ops devm_ 724 * @handle: The handle identifying the platform instance to use, when not 725 * calling the managed ops devm_ 726 * @proto_id: The protocol ID as in SCMI Specification 727 * @evt_id: The message ID of the desired event as in SCMI Specification 728 * @src_id: A pointer to the desired source ID if different sources are 729 * possible for the protocol (like domain_id, sensor_id...etc) 730 * 731 * @src_id can be provided as NULL if it simply does NOT make sense for 732 * the protocol at hand, OR if the user is explicitly interested in 733 * receiving notifications from ANY existent source associated to the 734 * specified proto_id / evt_id. 735 * 736 * Received notifications are finally delivered to the registered users, 737 * invoking the callback provided with the notifier_block *nb as follows: 738 * 739 * int user_cb(nb, evt_id, report) 740 * 741 * with: 742 * 743 * @nb: The notifier block provided by the user 744 * @evt_id: The message ID of the delivered event 745 * @report: A custom struct describing the specific event delivered 746 */ 747 struct scmi_notify_ops { 748 int (*devm_event_notifier_register)(struct scmi_device *sdev, 749 u8 proto_id, u8 evt_id, 750 const u32 *src_id, 751 struct notifier_block *nb); 752 int (*devm_event_notifier_unregister)(struct scmi_device *sdev, 753 u8 proto_id, u8 evt_id, 754 const u32 *src_id, 755 struct notifier_block *nb); 756 int (*event_notifier_register)(const struct scmi_handle *handle, 757 u8 proto_id, u8 evt_id, 758 const u32 *src_id, 759 struct notifier_block *nb); 760 int (*event_notifier_unregister)(const struct scmi_handle *handle, 761 u8 proto_id, u8 evt_id, 762 const u32 *src_id, 763 struct notifier_block *nb); 764 }; 765 766 /** 767 * struct scmi_handle - Handle returned to ARM SCMI clients for usage. 768 * 769 * @dev: pointer to the SCMI device 770 * @version: pointer to the structure containing SCMI version information 771 * @devm_protocol_acquire: devres managed method to get hold of a protocol, 772 * causing its initialization and related resource 773 * accounting 774 * @devm_protocol_get: devres managed method to acquire a protocol and get specific 775 * operations and a dedicated protocol handler 776 * @devm_protocol_put: devres managed method to release a protocol 777 * @is_transport_atomic: method to check if the underlying transport for this 778 * instance handle is configured to support atomic 779 * transactions for commands. 780 * Some users of the SCMI stack in the upper layers could 781 * be interested to know if they can assume SCMI 782 * command transactions associated to this handle will 783 * never sleep and act accordingly. 784 * An optional atomic threshold value could be returned 785 * where configured. 786 * @notify_ops: pointer to set of notifications related operations 787 */ 788 struct scmi_handle { 789 struct device *dev; 790 struct scmi_revision_info *version; 791 792 int __must_check (*devm_protocol_acquire)(struct scmi_device *sdev, 793 u8 proto); 794 const void __must_check * 795 (*devm_protocol_get)(struct scmi_device *sdev, u8 proto, 796 struct scmi_protocol_handle **ph); 797 void (*devm_protocol_put)(struct scmi_device *sdev, u8 proto); 798 bool (*is_transport_atomic)(const struct scmi_handle *handle, 799 unsigned int *atomic_threshold); 800 801 const struct scmi_notify_ops *notify_ops; 802 }; 803 804 enum scmi_std_protocol { 805 SCMI_PROTOCOL_BASE = 0x10, 806 SCMI_PROTOCOL_POWER = 0x11, 807 SCMI_PROTOCOL_SYSTEM = 0x12, 808 SCMI_PROTOCOL_PERF = 0x13, 809 SCMI_PROTOCOL_CLOCK = 0x14, 810 SCMI_PROTOCOL_SENSOR = 0x15, 811 SCMI_PROTOCOL_RESET = 0x16, 812 SCMI_PROTOCOL_VOLTAGE = 0x17, 813 SCMI_PROTOCOL_POWERCAP = 0x18, 814 }; 815 816 enum scmi_system_events { 817 SCMI_SYSTEM_SHUTDOWN, 818 SCMI_SYSTEM_COLDRESET, 819 SCMI_SYSTEM_WARMRESET, 820 SCMI_SYSTEM_POWERUP, 821 SCMI_SYSTEM_SUSPEND, 822 SCMI_SYSTEM_MAX 823 }; 824 825 struct scmi_device { 826 u32 id; 827 u8 protocol_id; 828 const char *name; 829 struct device dev; 830 struct scmi_handle *handle; 831 }; 832 833 #define to_scmi_dev(d) container_of(d, struct scmi_device, dev) 834 835 struct scmi_device_id { 836 u8 protocol_id; 837 const char *name; 838 }; 839 840 struct scmi_driver { 841 const char *name; 842 int (*probe)(struct scmi_device *sdev); 843 void (*remove)(struct scmi_device *sdev); 844 const struct scmi_device_id *id_table; 845 846 struct device_driver driver; 847 }; 848 849 #define to_scmi_driver(d) container_of(d, struct scmi_driver, driver) 850 851 #if IS_REACHABLE(CONFIG_ARM_SCMI_PROTOCOL) 852 int scmi_driver_register(struct scmi_driver *driver, 853 struct module *owner, const char *mod_name); 854 void scmi_driver_unregister(struct scmi_driver *driver); 855 #else 856 static inline int scmi_driver_register(struct scmi_driver * driver,struct module * owner,const char * mod_name)857 scmi_driver_register(struct scmi_driver *driver, struct module *owner, 858 const char *mod_name) 859 { 860 return -EINVAL; 861 } 862 scmi_driver_unregister(struct scmi_driver * driver)863 static inline void scmi_driver_unregister(struct scmi_driver *driver) {} 864 #endif /* CONFIG_ARM_SCMI_PROTOCOL */ 865 866 #define scmi_register(driver) \ 867 scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME) 868 #define scmi_unregister(driver) \ 869 scmi_driver_unregister(driver) 870 871 /** 872 * module_scmi_driver() - Helper macro for registering a scmi driver 873 * @__scmi_driver: scmi_driver structure 874 * 875 * Helper macro for scmi drivers to set up proper module init / exit 876 * functions. Replaces module_init() and module_exit() and keeps people from 877 * printing pointless things to the kernel log when their driver is loaded. 878 */ 879 #define module_scmi_driver(__scmi_driver) \ 880 module_driver(__scmi_driver, scmi_register, scmi_unregister) 881 882 /** 883 * module_scmi_protocol() - Helper macro for registering a scmi protocol 884 * @__scmi_protocol: scmi_protocol structure 885 * 886 * Helper macro for scmi drivers to set up proper module init / exit 887 * functions. Replaces module_init() and module_exit() and keeps people from 888 * printing pointless things to the kernel log when their driver is loaded. 889 */ 890 #define module_scmi_protocol(__scmi_protocol) \ 891 module_driver(__scmi_protocol, \ 892 scmi_protocol_register, scmi_protocol_unregister) 893 894 struct scmi_protocol; 895 int scmi_protocol_register(const struct scmi_protocol *proto); 896 void scmi_protocol_unregister(const struct scmi_protocol *proto); 897 898 /* SCMI Notification API - Custom Event Reports */ 899 enum scmi_notification_events { 900 SCMI_EVENT_POWER_STATE_CHANGED = 0x0, 901 SCMI_EVENT_CLOCK_RATE_CHANGED = 0x0, 902 SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED = 0x1, 903 SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0, 904 SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1, 905 SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0, 906 SCMI_EVENT_SENSOR_UPDATE = 0x1, 907 SCMI_EVENT_RESET_ISSUED = 0x0, 908 SCMI_EVENT_BASE_ERROR_EVENT = 0x0, 909 SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER = 0x0, 910 SCMI_EVENT_POWERCAP_CAP_CHANGED = 0x0, 911 SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED = 0x1, 912 }; 913 914 struct scmi_power_state_changed_report { 915 ktime_t timestamp; 916 unsigned int agent_id; 917 unsigned int domain_id; 918 unsigned int power_state; 919 }; 920 921 struct scmi_clock_rate_notif_report { 922 ktime_t timestamp; 923 unsigned int agent_id; 924 unsigned int clock_id; 925 unsigned long long rate; 926 }; 927 928 struct scmi_system_power_state_notifier_report { 929 ktime_t timestamp; 930 unsigned int agent_id; 931 #define SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(flags) ((flags) & BIT(0)) 932 unsigned int flags; 933 unsigned int system_state; 934 unsigned int timeout; 935 }; 936 937 struct scmi_perf_limits_report { 938 ktime_t timestamp; 939 unsigned int agent_id; 940 unsigned int domain_id; 941 unsigned int range_max; 942 unsigned int range_min; 943 }; 944 945 struct scmi_perf_level_report { 946 ktime_t timestamp; 947 unsigned int agent_id; 948 unsigned int domain_id; 949 unsigned int performance_level; 950 }; 951 952 struct scmi_sensor_trip_point_report { 953 ktime_t timestamp; 954 unsigned int agent_id; 955 unsigned int sensor_id; 956 unsigned int trip_point_desc; 957 }; 958 959 struct scmi_sensor_update_report { 960 ktime_t timestamp; 961 unsigned int agent_id; 962 unsigned int sensor_id; 963 unsigned int readings_count; 964 struct scmi_sensor_reading readings[]; 965 }; 966 967 struct scmi_reset_issued_report { 968 ktime_t timestamp; 969 unsigned int agent_id; 970 unsigned int domain_id; 971 unsigned int reset_state; 972 }; 973 974 struct scmi_base_error_report { 975 ktime_t timestamp; 976 unsigned int agent_id; 977 bool fatal; 978 unsigned int cmd_count; 979 unsigned long long reports[]; 980 }; 981 982 struct scmi_powercap_cap_changed_report { 983 ktime_t timestamp; 984 unsigned int agent_id; 985 unsigned int domain_id; 986 unsigned int power_cap; 987 unsigned int pai; 988 }; 989 990 struct scmi_powercap_meas_changed_report { 991 ktime_t timestamp; 992 unsigned int agent_id; 993 unsigned int domain_id; 994 unsigned int power; 995 }; 996 #endif /* _LINUX_SCMI_PROTOCOL_H */ 997