include/linux/scpi_protocol.h

   1 /*
   2  * SCPI Message Protocol driver header
   3  *
   4  * Copyright (C) 2014 ARM Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 #include <linux/types.h>
  19
  20 struct scpi_opp {
  21         u32 freq;
  22         u32 m_volt;
  23 } __packed;
  24
  25 struct scpi_dvfs_info {
  26         unsigned int count;
  27         unsigned int latency; /* in nanoseconds */
  28         struct scpi_opp *opps;
  29 };
  30
  31 enum scpi_sensor_class {
  32         TEMPERATURE,
  33         VOLTAGE,
  34         CURRENT,
  35         POWER,
  36         ENERGY,
  37 };
  38
  39 struct scpi_sensor_info {
  40         u16 sensor_id;
  41         u8 class;
  42         u8 trigger_type;
  43         char name[20];
  44 } __packed;
  45
  46 /**
  47  * struct scpi_ops - represents the various operations provided
  48  *      by SCP through SCPI message protocol
  49  * @get_version: returns the major and minor revision on the SCPI
  50  *      message protocol
  51  * @clk_get_range: gets clock range limit(min - max in Hz)
  52  * @clk_get_val: gets clock value(in Hz)
  53  * @clk_set_val: sets the clock value, setting to 0 will disable the
  54  *      clock (if supported)
  55  * @dvfs_get_idx: gets the Operating Point of the given power domain.
  56  *      OPP is an index to the list return by @dvfs_get_info
  57  * @dvfs_set_idx: sets the Operating Point of the given power domain.
  58  *      OPP is an index to the list return by @dvfs_get_info
  59  * @dvfs_get_info: returns the DVFS capabilities of the given power
  60  *      domain. It includes the OPP list and the latency information
  61  */
  62 struct scpi_ops {
  63         u32 (*get_version)(void);
  64         int (*clk_get_range)(u16, unsigned long *, unsigned long *);
  65         unsigned long (*clk_get_val)(u16);
  66         int (*clk_set_val)(u16, unsigned long);
  67         int (*dvfs_get_idx)(u8);
  68         int (*dvfs_set_idx)(u8, u8);
  69         struct scpi_dvfs_info *(*dvfs_get_info)(u8);
  70         int (*device_domain_id)(struct device *);
  71         int (*get_transition_latency)(struct device *);
  72         int (*add_opps_to_device)(struct device *);
  73         int (*sensor_get_capability)(u16 *sensors);
  74         int (*sensor_get_info)(u16 sensor_id, struct scpi_sensor_info *);
  75         int (*sensor_get_value)(u16, u64 *);
  76         int (*device_get_power_state)(u16);
  77         int (*device_set_power_state)(u16, u8);
  78 };
  79
  80 #if IS_REACHABLE(CONFIG_ARM_SCPI_PROTOCOL)
  81 struct scpi_ops *get_scpi_ops(void);
  82 #else
  83 static inline struct scpi_ops *get_scpi_ops(void) { return NULL; }
  84 #endif