include/linux/scmi_protocol.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SCMI Message Protocol driver header
   4  *
   5  * Copyright (C) 2018 ARM Ltd.
   6  */
   7 #include <linux/device.h>
   8 #include <linux/types.h>
   9
  10 #define SCMI_MAX_STR_SIZE       16
  11 #define SCMI_MAX_NUM_RATES      16
  12
  13 /**
  14  * struct scmi_revision_info - version information structure
  15  *
  16  * @major_ver: Major ABI version. Change here implies risk of backward
  17  *      compatibility break.
  18  * @minor_ver: Minor ABI version. Change here implies new feature addition,
  19  *      or compatible change in ABI.
  20  * @num_protocols: Number of protocols that are implemented, excluding the
  21  *      base protocol.
  22  * @num_agents: Number of agents in the system.
  23  * @impl_ver: A vendor-specific implementation version.
  24  * @vendor_id: A vendor identifier(Null terminated ASCII string)
  25  * @sub_vendor_id: A sub-vendor identifier(Null terminated ASCII string)
  26  */
  27 struct scmi_revision_info {
  28         u16 major_ver;
  29         u16 minor_ver;
  30         u8 num_protocols;
  31         u8 num_agents;
  32         u32 impl_ver;
  33         char vendor_id[SCMI_MAX_STR_SIZE];
  34         char sub_vendor_id[SCMI_MAX_STR_SIZE];
  35 };
  36
  37 struct scmi_clock_info {
  38         char name[SCMI_MAX_STR_SIZE];
  39         bool rate_discrete;
  40         union {
  41                 struct {
  42                         int num_rates;
  43                         u64 rates[SCMI_MAX_NUM_RATES];
  44                 } list;
  45                 struct {
  46                         u64 min_rate;
  47                         u64 max_rate;
  48                         u64 step_size;
  49                 } range;
  50         };
  51 };
  52
  53 struct scmi_handle;
  54
  55 /**
  56  * struct scmi_clk_ops - represents the various operations provided
  57  *      by SCMI Clock Protocol
  58  *
  59  * @count_get: get the count of clocks provided by SCMI
  60  * @info_get: get the information of the specified clock
  61  * @rate_get: request the current clock rate of a clock
  62  * @rate_set: set the clock rate of a clock
  63  * @enable: enables the specified clock
  64  * @disable: disables the specified clock
  65  */
  66 struct scmi_clk_ops {
  67         int (*count_get)(const struct scmi_handle *handle);
  68
  69         const struct scmi_clock_info *(*info_get)
  70                 (const struct scmi_handle *handle, u32 clk_id);
  71         int (*rate_get)(const struct scmi_handle *handle, u32 clk_id,
  72                         u64 *rate);
  73         int (*rate_set)(const struct scmi_handle *handle, u32 clk_id,
  74                         u32 config, u64 rate);
  75         int (*enable)(const struct scmi_handle *handle, u32 clk_id);
  76         int (*disable)(const struct scmi_handle *handle, u32 clk_id);
  77 };
  78
  79 /**
  80  * struct scmi_perf_ops - represents the various operations provided
  81  *      by SCMI Performance Protocol
  82  *
  83  * @limits_set: sets limits on the performance level of a domain
  84  * @limits_get: gets limits on the performance level of a domain
  85  * @level_set: sets the performance level of a domain
  86  * @level_get: gets the performance level of a domain
  87  * @device_domain_id: gets the scmi domain id for a given device
  88  * @transition_latency_get: gets the DVFS transition latency for a given device
  89  * @device_opps_add: adds all the OPPs for a given device
  90  * @freq_set: sets the frequency for a given device using sustained frequency
  91  *      to sustained performance level mapping
  92  * @freq_get: gets the frequency for a given device using sustained frequency
  93  *      to sustained performance level mapping
  94  */
  95 struct scmi_perf_ops {
  96         int (*limits_set)(const struct scmi_handle *handle, u32 domain,
  97                           u32 max_perf, u32 min_perf);
  98         int (*limits_get)(const struct scmi_handle *handle, u32 domain,
  99                           u32 *max_perf, u32 *min_perf);
 100         int (*level_set)(const struct scmi_handle *handle, u32 domain,
 101                          u32 level, bool poll);
 102         int (*level_get)(const struct scmi_handle *handle, u32 domain,
 103                          u32 *level, bool poll);
 104         int (*device_domain_id)(struct device *dev);
 105         int (*transition_latency_get)(const struct scmi_handle *handle,
 106                                       struct device *dev);
 107         int (*device_opps_add)(const struct scmi_handle *handle,
 108                                struct device *dev);
 109         int (*freq_set)(const struct scmi_handle *handle, u32 domain,
 110                         unsigned long rate, bool poll);
 111         int (*freq_get)(const struct scmi_handle *handle, u32 domain,
 112                         unsigned long *rate, bool poll);
 113 };
 114
 115 /**
 116  * struct scmi_power_ops - represents the various operations provided
 117  *      by SCMI Power Protocol
 118  *
 119  * @num_domains_get: get the count of power domains provided by SCMI
 120  * @name_get: gets the name of a power domain
 121  * @state_set: sets the power state of a power domain
 122  * @state_get: gets the power state of a power domain
 123  */
 124 struct scmi_power_ops {
 125         int (*num_domains_get)(const struct scmi_handle *handle);
 126         char *(*name_get)(const struct scmi_handle *handle, u32 domain);
 127 #define SCMI_POWER_STATE_TYPE_SHIFT     30
 128 #define SCMI_POWER_STATE_ID_MASK        (BIT(28) - 1)
 129 #define SCMI_POWER_STATE_PARAM(type, id) \
 130         ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \
 131                 ((id) & SCMI_POWER_STATE_ID_MASK))
 132 #define SCMI_POWER_STATE_GENERIC_ON     SCMI_POWER_STATE_PARAM(0, 0)
 133 #define SCMI_POWER_STATE_GENERIC_OFF    SCMI_POWER_STATE_PARAM(1, 0)
 134         int (*state_set)(const struct scmi_handle *handle, u32 domain,
 135                          u32 state);
 136         int (*state_get)(const struct scmi_handle *handle, u32 domain,
 137                          u32 *state);
 138 };
 139
 140 struct scmi_sensor_info {
 141         u32 id;
 142         u8 type;
 143         char name[SCMI_MAX_STR_SIZE];
 144 };
 145
 146 /*
 147  * Partial list from Distributed Management Task Force (DMTF) specification:
 148  * DSP0249 (Platform Level Data Model specification)
 149  */
 150 enum scmi_sensor_class {
 151         NONE = 0x0,
 152         TEMPERATURE_C = 0x2,
 153         VOLTAGE = 0x5,
 154         CURRENT = 0x6,
 155         POWER = 0x7,
 156         ENERGY = 0x8,
 157 };
 158
 159 /**
 160  * struct scmi_sensor_ops - represents the various operations provided
 161  *      by SCMI Sensor Protocol
 162  *
 163  * @count_get: get the count of sensors provided by SCMI
 164  * @info_get: get the information of the specified sensor
 165  * @configuration_set: control notifications on cross-over events for
 166  *      the trip-points
 167  * @trip_point_set: selects and configures a trip-point of interest
 168  * @reading_get: gets the current value of the sensor
 169  */
 170 struct scmi_sensor_ops {
 171         int (*count_get)(const struct scmi_handle *handle);
 172
 173         const struct scmi_sensor_info *(*info_get)
 174                 (const struct scmi_handle *handle, u32 sensor_id);
 175         int (*configuration_set)(const struct scmi_handle *handle,
 176                                  u32 sensor_id);
 177         int (*trip_point_set)(const struct scmi_handle *handle, u32 sensor_id,
 178                               u8 trip_id, u64 trip_value);
 179         int (*reading_get)(const struct scmi_handle *handle, u32 sensor_id,
 180                            bool async, u64 *value);
 181 };
 182
 183 /**
 184  * struct scmi_handle - Handle returned to ARM SCMI clients for usage.
 185  *
 186  * @dev: pointer to the SCMI device
 187  * @version: pointer to the structure containing SCMI version information
 188  * @power_ops: pointer to set of power protocol operations
 189  * @perf_ops: pointer to set of performance protocol operations
 190  * @clk_ops: pointer to set of clock protocol operations
 191  * @sensor_ops: pointer to set of sensor protocol operations
 192  * @perf_priv: pointer to private data structure specific to performance
 193  *      protocol(for internal use only)
 194  * @clk_priv: pointer to private data structure specific to clock
 195  *      protocol(for internal use only)
 196  * @power_priv: pointer to private data structure specific to power
 197  *      protocol(for internal use only)
 198  * @sensor_priv: pointer to private data structure specific to sensors
 199  *      protocol(for internal use only)
 200  */
 201 struct scmi_handle {
 202         struct device *dev;
 203         struct scmi_revision_info *version;
 204         struct scmi_perf_ops *perf_ops;
 205         struct scmi_clk_ops *clk_ops;
 206         struct scmi_power_ops *power_ops;
 207         struct scmi_sensor_ops *sensor_ops;
 208         /* for protocol internal use */
 209         void *perf_priv;
 210         void *clk_priv;
 211         void *power_priv;
 212         void *sensor_priv;
 213 };
 214
 215 enum scmi_std_protocol {
 216         SCMI_PROTOCOL_BASE = 0x10,
 217         SCMI_PROTOCOL_POWER = 0x11,
 218         SCMI_PROTOCOL_SYSTEM = 0x12,
 219         SCMI_PROTOCOL_PERF = 0x13,
 220         SCMI_PROTOCOL_CLOCK = 0x14,
 221         SCMI_PROTOCOL_SENSOR = 0x15,
 222 };
 223
 224 struct scmi_device {
 225         u32 id;
 226         u8 protocol_id;
 227         struct device dev;
 228         struct scmi_handle *handle;
 229 };
 230
 231 #define to_scmi_dev(d) container_of(d, struct scmi_device, dev)
 232
 233 struct scmi_device *
 234 scmi_device_create(struct device_node *np, struct device *parent, int protocol);
 235 void scmi_device_destroy(struct scmi_device *scmi_dev);
 236
 237 struct scmi_device_id {
 238         u8 protocol_id;
 239 };
 240
 241 struct scmi_driver {
 242         const char *name;
 243         int (*probe)(struct scmi_device *sdev);
 244         void (*remove)(struct scmi_device *sdev);
 245         const struct scmi_device_id *id_table;
 246
 247         struct device_driver driver;
 248 };
 249
 250 #define to_scmi_driver(d) container_of(d, struct scmi_driver, driver)
 251
 252 #ifdef CONFIG_ARM_SCMI_PROTOCOL
 253 int scmi_driver_register(struct scmi_driver *driver,
 254                          struct module *owner, const char *mod_name);
 255 void scmi_driver_unregister(struct scmi_driver *driver);
 256 #else
 257 static inline int
 258 scmi_driver_register(struct scmi_driver *driver, struct module *owner,
 259                      const char *mod_name)
 260 {
 261         return -EINVAL;
 262 }
 263
 264 static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
 265 #endif /* CONFIG_ARM_SCMI_PROTOCOL */
 266
 267 #define scmi_register(driver) \
 268         scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
 269 #define scmi_unregister(driver) \
 270         scmi_driver_unregister(driver)
 271
 272 /**
 273  * module_scmi_driver() - Helper macro for registering a scmi driver
 274  * @__scmi_driver: scmi_driver structure
 275  *
 276  * Helper macro for scmi drivers to set up proper module init / exit
 277  * functions.  Replaces module_init() and module_exit() and keeps people from
 278  * printing pointless things to the kernel log when their driver is loaded.
 279  */
 280 #define module_scmi_driver(__scmi_driver)       \
 281         module_driver(__scmi_driver, scmi_register, scmi_unregister)
 282
 283 typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *);
 284 int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn);
 285 void scmi_protocol_unregister(int protocol_id);