1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * SCMI Message Protocol driver header
5 * Copyright (C) 2018 ARM Ltd.
8 #ifndef _LINUX_SCMI_PROTOCOL_H
9 #define _LINUX_SCMI_PROTOCOL_H
11 #include <linux/device.h>
12 #include <linux/notifier.h>
13 #include <linux/types.h>
15 #define SCMI_MAX_STR_SIZE 16
16 #define SCMI_MAX_NUM_RATES 16
19 * struct scmi_revision_info - version information structure
21 * @major_ver: Major ABI version. Change here implies risk of backward
22 * compatibility break.
23 * @minor_ver: Minor ABI version. Change here implies new feature addition,
24 * or compatible change in ABI.
25 * @num_protocols: Number of protocols that are implemented, excluding the
27 * @num_agents: Number of agents in the system.
28 * @impl_ver: A vendor-specific implementation version.
29 * @vendor_id: A vendor identifier(Null terminated ASCII string)
30 * @sub_vendor_id: A sub-vendor identifier(Null terminated ASCII string)
32 struct scmi_revision_info {
38 char vendor_id[SCMI_MAX_STR_SIZE];
39 char sub_vendor_id[SCMI_MAX_STR_SIZE];
42 struct scmi_clock_info {
43 char name[SCMI_MAX_STR_SIZE];
48 u64 rates[SCMI_MAX_NUM_RATES];
61 * struct scmi_clk_ops - represents the various operations provided
62 * by SCMI Clock Protocol
64 * @count_get: get the count of clocks provided by SCMI
65 * @info_get: get the information of the specified clock
66 * @rate_get: request the current clock rate of a clock
67 * @rate_set: set the clock rate of a clock
68 * @enable: enables the specified clock
69 * @disable: disables the specified clock
72 int (*count_get)(const struct scmi_handle *handle);
74 const struct scmi_clock_info *(*info_get)
75 (const struct scmi_handle *handle, u32 clk_id);
76 int (*rate_get)(const struct scmi_handle *handle, u32 clk_id,
78 int (*rate_set)(const struct scmi_handle *handle, u32 clk_id,
80 int (*enable)(const struct scmi_handle *handle, u32 clk_id);
81 int (*disable)(const struct scmi_handle *handle, u32 clk_id);
85 * struct scmi_perf_ops - represents the various operations provided
86 * by SCMI Performance Protocol
88 * @limits_set: sets limits on the performance level of a domain
89 * @limits_get: gets limits on the performance level of a domain
90 * @level_set: sets the performance level of a domain
91 * @level_get: gets the performance level of a domain
92 * @device_domain_id: gets the scmi domain id for a given device
93 * @transition_latency_get: gets the DVFS transition latency for a given device
94 * @device_opps_add: adds all the OPPs for a given device
95 * @freq_set: sets the frequency for a given device using sustained frequency
96 * to sustained performance level mapping
97 * @freq_get: gets the frequency for a given device using sustained frequency
98 * to sustained performance level mapping
99 * @est_power_get: gets the estimated power cost for a given performance domain
100 * at a given frequency
102 struct scmi_perf_ops {
103 int (*limits_set)(const struct scmi_handle *handle, u32 domain,
104 u32 max_perf, u32 min_perf);
105 int (*limits_get)(const struct scmi_handle *handle, u32 domain,
106 u32 *max_perf, u32 *min_perf);
107 int (*level_set)(const struct scmi_handle *handle, u32 domain,
108 u32 level, bool poll);
109 int (*level_get)(const struct scmi_handle *handle, u32 domain,
110 u32 *level, bool poll);
111 int (*device_domain_id)(struct device *dev);
112 int (*transition_latency_get)(const struct scmi_handle *handle,
114 int (*device_opps_add)(const struct scmi_handle *handle,
116 int (*freq_set)(const struct scmi_handle *handle, u32 domain,
117 unsigned long rate, bool poll);
118 int (*freq_get)(const struct scmi_handle *handle, u32 domain,
119 unsigned long *rate, bool poll);
120 int (*est_power_get)(const struct scmi_handle *handle, u32 domain,
121 unsigned long *rate, unsigned long *power);
122 bool (*fast_switch_possible)(const struct scmi_handle *handle,
127 * struct scmi_power_ops - represents the various operations provided
128 * by SCMI Power Protocol
130 * @num_domains_get: get the count of power domains provided by SCMI
131 * @name_get: gets the name of a power domain
132 * @state_set: sets the power state of a power domain
133 * @state_get: gets the power state of a power domain
135 struct scmi_power_ops {
136 int (*num_domains_get)(const struct scmi_handle *handle);
137 char *(*name_get)(const struct scmi_handle *handle, u32 domain);
138 #define SCMI_POWER_STATE_TYPE_SHIFT 30
139 #define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1)
140 #define SCMI_POWER_STATE_PARAM(type, id) \
141 ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \
142 ((id) & SCMI_POWER_STATE_ID_MASK))
143 #define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0)
144 #define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0)
145 int (*state_set)(const struct scmi_handle *handle, u32 domain,
147 int (*state_get)(const struct scmi_handle *handle, u32 domain,
151 struct scmi_sensor_info {
157 char name[SCMI_MAX_STR_SIZE];
161 * Partial list from Distributed Management Task Force (DMTF) specification:
162 * DSP0249 (Platform Level Data Model specification)
164 enum scmi_sensor_class {
174 * struct scmi_sensor_ops - represents the various operations provided
175 * by SCMI Sensor Protocol
177 * @count_get: get the count of sensors provided by SCMI
178 * @info_get: get the information of the specified sensor
179 * @trip_point_config: selects and configures a trip-point of interest
180 * @reading_get: gets the current value of the sensor
182 struct scmi_sensor_ops {
183 int (*count_get)(const struct scmi_handle *handle);
184 const struct scmi_sensor_info *(*info_get)
185 (const struct scmi_handle *handle, u32 sensor_id);
186 int (*trip_point_config)(const struct scmi_handle *handle,
187 u32 sensor_id, u8 trip_id, u64 trip_value);
188 int (*reading_get)(const struct scmi_handle *handle, u32 sensor_id,
193 * struct scmi_reset_ops - represents the various operations provided
194 * by SCMI Reset Protocol
196 * @num_domains_get: get the count of reset domains provided by SCMI
197 * @name_get: gets the name of a reset domain
198 * @latency_get: gets the reset latency for the specified reset domain
199 * @reset: resets the specified reset domain
200 * @assert: explicitly assert reset signal of the specified reset domain
201 * @deassert: explicitly deassert reset signal of the specified reset domain
203 struct scmi_reset_ops {
204 int (*num_domains_get)(const struct scmi_handle *handle);
205 char *(*name_get)(const struct scmi_handle *handle, u32 domain);
206 int (*latency_get)(const struct scmi_handle *handle, u32 domain);
207 int (*reset)(const struct scmi_handle *handle, u32 domain);
208 int (*assert)(const struct scmi_handle *handle, u32 domain);
209 int (*deassert)(const struct scmi_handle *handle, u32 domain);
213 * struct scmi_voltage_info - describe one available SCMI Voltage Domain
215 * @id: the domain ID as advertised by the platform
216 * @segmented: defines the layout of the entries of array @levels_uv.
217 * - when True the entries are to be interpreted as triplets,
218 * each defining a segment representing a range of equally
219 * space voltages: <lowest_volts>, <highest_volt>, <step_uV>
220 * - when False the entries simply represent a single discrete
221 * supported voltage level
222 * @negative_volts_allowed: True if any of the entries of @levels_uv represent
223 * a negative voltage.
224 * @attributes: represents Voltage Domain advertised attributes
225 * @name: name assigned to the Voltage Domain by platform
226 * @num_levels: number of total entries in @levels_uv.
227 * @levels_uv: array of entries describing the available voltage levels for
230 struct scmi_voltage_info {
233 bool negative_volts_allowed;
234 unsigned int attributes;
235 char name[SCMI_MAX_STR_SIZE];
236 unsigned int num_levels;
237 #define SCMI_VOLTAGE_SEGMENT_LOW 0
238 #define SCMI_VOLTAGE_SEGMENT_HIGH 1
239 #define SCMI_VOLTAGE_SEGMENT_STEP 2
244 * struct scmi_voltage_ops - represents the various operations provided
245 * by SCMI Voltage Protocol
247 * @num_domains_get: get the count of voltage domains provided by SCMI
248 * @info_get: get the information of the specified domain
249 * @config_set: set the config for the specified domain
250 * @config_get: get the config of the specified domain
251 * @level_set: set the voltage level for the specified domain
252 * @level_get: get the voltage level of the specified domain
254 struct scmi_voltage_ops {
255 int (*num_domains_get)(const struct scmi_handle *handle);
256 const struct scmi_voltage_info __must_check *(*info_get)
257 (const struct scmi_handle *handle, u32 domain_id);
258 int (*config_set)(const struct scmi_handle *handle, u32 domain_id,
260 #define SCMI_VOLTAGE_ARCH_STATE_OFF 0x0
261 #define SCMI_VOLTAGE_ARCH_STATE_ON 0x7
262 int (*config_get)(const struct scmi_handle *handle, u32 domain_id,
264 int (*level_set)(const struct scmi_handle *handle, u32 domain_id,
265 u32 flags, s32 volt_uV);
266 int (*level_get)(const struct scmi_handle *handle, u32 domain_id,
271 * struct scmi_notify_ops - represents notifications' operations provided by
273 * @register_event_notifier: Register a notifier_block for the requested event
274 * @unregister_event_notifier: Unregister a notifier_block for the requested
277 * A user can register/unregister its own notifier_block against the wanted
278 * platform instance regarding the desired event identified by the
279 * tuple: (proto_id, evt_id, src_id) using the provided register/unregister
282 * @handle: The handle identifying the platform instance to use
283 * @proto_id: The protocol ID as in SCMI Specification
284 * @evt_id: The message ID of the desired event as in SCMI Specification
285 * @src_id: A pointer to the desired source ID if different sources are
286 * possible for the protocol (like domain_id, sensor_id...etc)
288 * @src_id can be provided as NULL if it simply does NOT make sense for
289 * the protocol at hand, OR if the user is explicitly interested in
290 * receiving notifications from ANY existent source associated to the
291 * specified proto_id / evt_id.
293 * Received notifications are finally delivered to the registered users,
294 * invoking the callback provided with the notifier_block *nb as follows:
296 * int user_cb(nb, evt_id, report)
300 * @nb: The notifier block provided by the user
301 * @evt_id: The message ID of the delivered event
302 * @report: A custom struct describing the specific event delivered
304 struct scmi_notify_ops {
305 int (*register_event_notifier)(const struct scmi_handle *handle,
306 u8 proto_id, u8 evt_id, u32 *src_id,
307 struct notifier_block *nb);
308 int (*unregister_event_notifier)(const struct scmi_handle *handle,
309 u8 proto_id, u8 evt_id, u32 *src_id,
310 struct notifier_block *nb);
314 * struct scmi_handle - Handle returned to ARM SCMI clients for usage.
316 * @dev: pointer to the SCMI device
317 * @version: pointer to the structure containing SCMI version information
318 * @power_ops: pointer to set of power protocol operations
319 * @perf_ops: pointer to set of performance protocol operations
320 * @clk_ops: pointer to set of clock protocol operations
321 * @sensor_ops: pointer to set of sensor protocol operations
322 * @reset_ops: pointer to set of reset protocol operations
323 * @voltage_ops: pointer to set of voltage protocol operations
324 * @notify_ops: pointer to set of notifications related operations
325 * @perf_priv: pointer to private data structure specific to performance
326 * protocol(for internal use only)
327 * @clk_priv: pointer to private data structure specific to clock
328 * protocol(for internal use only)
329 * @power_priv: pointer to private data structure specific to power
330 * protocol(for internal use only)
331 * @sensor_priv: pointer to private data structure specific to sensors
332 * protocol(for internal use only)
333 * @reset_priv: pointer to private data structure specific to reset
334 * protocol(for internal use only)
335 * @voltage_priv: pointer to private data structure specific to voltage
336 * protocol(for internal use only)
337 * @notify_priv: pointer to private data structure specific to notifications
338 * (for internal use only)
342 struct scmi_revision_info *version;
343 const struct scmi_perf_ops *perf_ops;
344 const struct scmi_clk_ops *clk_ops;
345 const struct scmi_power_ops *power_ops;
346 const struct scmi_sensor_ops *sensor_ops;
347 const struct scmi_reset_ops *reset_ops;
348 const struct scmi_voltage_ops *voltage_ops;
349 const struct scmi_notify_ops *notify_ops;
350 /* for protocol internal use */
361 enum scmi_std_protocol {
362 SCMI_PROTOCOL_BASE = 0x10,
363 SCMI_PROTOCOL_POWER = 0x11,
364 SCMI_PROTOCOL_SYSTEM = 0x12,
365 SCMI_PROTOCOL_PERF = 0x13,
366 SCMI_PROTOCOL_CLOCK = 0x14,
367 SCMI_PROTOCOL_SENSOR = 0x15,
368 SCMI_PROTOCOL_RESET = 0x16,
369 SCMI_PROTOCOL_VOLTAGE = 0x17,
372 enum scmi_system_events {
373 SCMI_SYSTEM_SHUTDOWN,
374 SCMI_SYSTEM_COLDRESET,
375 SCMI_SYSTEM_WARMRESET,
386 struct scmi_handle *handle;
389 #define to_scmi_dev(d) container_of(d, struct scmi_device, dev)
392 scmi_device_create(struct device_node *np, struct device *parent, int protocol,
394 void scmi_device_destroy(struct scmi_device *scmi_dev);
396 struct scmi_device_id {
403 int (*probe)(struct scmi_device *sdev);
404 void (*remove)(struct scmi_device *sdev);
405 const struct scmi_device_id *id_table;
407 struct device_driver driver;
410 #define to_scmi_driver(d) container_of(d, struct scmi_driver, driver)
412 #if IS_REACHABLE(CONFIG_ARM_SCMI_PROTOCOL)
413 int scmi_driver_register(struct scmi_driver *driver,
414 struct module *owner, const char *mod_name);
415 void scmi_driver_unregister(struct scmi_driver *driver);
418 scmi_driver_register(struct scmi_driver *driver, struct module *owner,
419 const char *mod_name)
424 static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
425 #endif /* CONFIG_ARM_SCMI_PROTOCOL */
427 #define scmi_register(driver) \
428 scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
429 #define scmi_unregister(driver) \
430 scmi_driver_unregister(driver)
433 * module_scmi_driver() - Helper macro for registering a scmi driver
434 * @__scmi_driver: scmi_driver structure
436 * Helper macro for scmi drivers to set up proper module init / exit
437 * functions. Replaces module_init() and module_exit() and keeps people from
438 * printing pointless things to the kernel log when their driver is loaded.
440 #define module_scmi_driver(__scmi_driver) \
441 module_driver(__scmi_driver, scmi_register, scmi_unregister)
443 typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *);
444 int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn);
445 void scmi_protocol_unregister(int protocol_id);
447 /* SCMI Notification API - Custom Event Reports */
448 enum scmi_notification_events {
449 SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
450 SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
451 SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
452 SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
453 SCMI_EVENT_RESET_ISSUED = 0x0,
454 SCMI_EVENT_BASE_ERROR_EVENT = 0x0,
455 SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER = 0x0,
458 struct scmi_power_state_changed_report {
460 unsigned int agent_id;
461 unsigned int domain_id;
462 unsigned int power_state;
465 struct scmi_system_power_state_notifier_report {
467 unsigned int agent_id;
469 unsigned int system_state;
472 struct scmi_perf_limits_report {
474 unsigned int agent_id;
475 unsigned int domain_id;
476 unsigned int range_max;
477 unsigned int range_min;
480 struct scmi_perf_level_report {
482 unsigned int agent_id;
483 unsigned int domain_id;
484 unsigned int performance_level;
487 struct scmi_sensor_trip_point_report {
489 unsigned int agent_id;
490 unsigned int sensor_id;
491 unsigned int trip_point_desc;
494 struct scmi_reset_issued_report {
496 unsigned int agent_id;
497 unsigned int domain_id;
498 unsigned int reset_state;
501 struct scmi_base_error_report {
503 unsigned int agent_id;
505 unsigned int cmd_count;
506 unsigned long long reports[];
509 #endif /* _LINUX_SCMI_PROTOCOL_H */