include/linux/scpi_protocol.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * SCPI Message Protocol driver header
   4  *
   5  * Copyright (C) 2014 ARM Ltd.
   6  */
   7
   8 #ifndef _LINUX_SCPI_PROTOCOL_H
   9 #define _LINUX_SCPI_PROTOCOL_H
  10
  11 #include <linux/types.h>
  12
  13 struct scpi_opp {
  14         u32 freq;
  15         u32 m_volt;
  16 } __packed;
  17
  18 struct scpi_dvfs_info {
  19         unsigned int count;
  20         unsigned int latency; /* in nanoseconds */
  21         struct scpi_opp *opps;
  22 };
  23
  24 enum scpi_sensor_class {
  25         TEMPERATURE,
  26         VOLTAGE,
  27         CURRENT,
  28         POWER,
  29         ENERGY,
  30 };
  31
  32 struct scpi_sensor_info {
  33         u16 sensor_id;
  34         u8 class;
  35         u8 trigger_type;
  36         char name[20];
  37 } __packed;
  38
  39 /**
  40  * struct scpi_ops - represents the various operations provided
  41  *      by SCP through SCPI message protocol
  42  * @get_version: returns the major and minor revision on the SCPI
  43  *      message protocol
  44  * @clk_get_range: gets clock range limit(min - max in Hz)
  45  * @clk_get_val: gets clock value(in Hz)
  46  * @clk_set_val: sets the clock value, setting to 0 will disable the
  47  *      clock (if supported)
  48  * @dvfs_get_idx: gets the Operating Point of the given power domain.
  49  *      OPP is an index to the list return by @dvfs_get_info
  50  * @dvfs_set_idx: sets the Operating Point of the given power domain.
  51  *      OPP is an index to the list return by @dvfs_get_info
  52  * @dvfs_get_info: returns the DVFS capabilities of the given power
  53  *      domain. It includes the OPP list and the latency information
  54  * @device_domain_id: gets the scpi domain id for a given device
  55  * @get_transition_latency: gets the DVFS transition latency for a given device
  56  * @add_opps_to_device: adds all the OPPs for a given device
  57  * @sensor_get_capability: get the list of capabilities for the sensors
  58  * @sensor_get_info: get the information of the specified sensor
  59  * @sensor_get_value: gets the current value of the sensor
  60  * @device_get_power_state: gets the power state of a power domain
  61  * @device_set_power_state: sets the power state of a power domain
  62  */
  63 struct scpi_ops {
  64         u32 (*get_version)(void);
  65         int (*clk_get_range)(u16, unsigned long *, unsigned long *);
  66         unsigned long (*clk_get_val)(u16);
  67         int (*clk_set_val)(u16, unsigned long);
  68         int (*dvfs_get_idx)(u8);
  69         int (*dvfs_set_idx)(u8, u8);
  70         struct scpi_dvfs_info *(*dvfs_get_info)(u8);
  71         int (*device_domain_id)(struct device *);
  72         int (*get_transition_latency)(struct device *);
  73         int (*add_opps_to_device)(struct device *);
  74         int (*sensor_get_capability)(u16 *sensors);
  75         int (*sensor_get_info)(u16 sensor_id, struct scpi_sensor_info *);
  76         int (*sensor_get_value)(u16, u64 *);
  77         int (*device_get_power_state)(u16);
  78         int (*device_set_power_state)(u16, u8);
  79 };
  80
  81 #if IS_REACHABLE(CONFIG_ARM_SCPI_PROTOCOL)
  82 struct scpi_ops *get_scpi_ops(void);
  83 #else
  84 static inline struct scpi_ops *get_scpi_ops(void) { return NULL; }
  85 #endif
  86
  87 #endif /* _LINUX_SCPI_PROTOCOL_H */