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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* SCMI Message Protocol driver header
*
* Copyright (C) 2018 ARM Ltd.
*/
#include <linux/device.h>
#include <linux/types.h>
#define SCMI_MAX_STR_SIZE 16
#define SCMI_MAX_NUM_RATES 16
/**
* struct scmi_revision_info - version information structure
*
* @major_ver: Major ABI version. Change here implies risk of backward
* compatibility break.
* @minor_ver: Minor ABI version. Change here implies new feature addition,
* or compatible change in ABI.
* @num_protocols: Number of protocols that are implemented, excluding the
* base protocol.
* @num_agents: Number of agents in the system.
* @impl_ver: A vendor-specific implementation version.
* @vendor_id: A vendor identifier(Null terminated ASCII string)
* @sub_vendor_id: A sub-vendor identifier(Null terminated ASCII string)
*/
struct scmi_revision_info {
u16 major_ver;
u16 minor_ver;
u8 num_protocols;
u8 num_agents;
u32 impl_ver;
char vendor_id[SCMI_MAX_STR_SIZE];
char sub_vendor_id[SCMI_MAX_STR_SIZE];
};
struct scmi_clock_info {
char name[SCMI_MAX_STR_SIZE];
bool rate_discrete;
union {
struct {
int num_rates;
u64 rates[SCMI_MAX_NUM_RATES];
} list;
struct {
u64 min_rate;
u64 max_rate;
u64 step_size;
} range;
};
};
struct scmi_handle;
/**
* struct scmi_clk_ops - represents the various operations provided
* by SCMI Clock Protocol
*
* @count_get: get the count of clocks provided by SCMI
* @info_get: get the information of the specified clock
* @rate_get: request the current clock rate of a clock
* @rate_set: set the clock rate of a clock
* @enable: enables the specified clock
* @disable: disables the specified clock
*/
struct scmi_clk_ops {
int (*count_get)(const struct scmi_handle *handle);
const struct scmi_clock_info *(*info_get)
(const struct scmi_handle *handle, u32 clk_id);
int (*rate_get)(const struct scmi_handle *handle, u32 clk_id,
u64 *rate);
int (*rate_set)(const struct scmi_handle *handle, u32 clk_id,
u64 rate);
int (*enable)(const struct scmi_handle *handle, u32 clk_id);
int (*disable)(const struct scmi_handle *handle, u32 clk_id);
};
/**
* struct scmi_perf_ops - represents the various operations provided
* by SCMI Performance Protocol
*
* @limits_set: sets limits on the performance level of a domain
* @limits_get: gets limits on the performance level of a domain
* @level_set: sets the performance level of a domain
* @level_get: gets the performance level of a domain
* @device_domain_id: gets the scmi domain id for a given device
* @transition_latency_get: gets the DVFS transition latency for a given device
* @device_opps_add: adds all the OPPs for a given device
* @freq_set: sets the frequency for a given device using sustained frequency
* to sustained performance level mapping
* @freq_get: gets the frequency for a given device using sustained frequency
* to sustained performance level mapping
* @est_power_get: gets the estimated power cost for a given performance domain
* at a given frequency
*/
struct scmi_perf_ops {
int (*limits_set)(const struct scmi_handle *handle, u32 domain,
u32 max_perf, u32 min_perf);
int (*limits_get)(const struct scmi_handle *handle, u32 domain,
u32 *max_perf, u32 *min_perf);
int (*level_set)(const struct scmi_handle *handle, u32 domain,
u32 level, bool poll);
int (*level_get)(const struct scmi_handle *handle, u32 domain,
u32 *level, bool poll);
int (*device_domain_id)(struct device *dev);
int (*transition_latency_get)(const struct scmi_handle *handle,
struct device *dev);
int (*device_opps_add)(const struct scmi_handle *handle,
struct device *dev);
int (*freq_set)(const struct scmi_handle *handle, u32 domain,
unsigned long rate, bool poll);
int (*freq_get)(const struct scmi_handle *handle, u32 domain,
unsigned long *rate, bool poll);
int (*est_power_get)(const struct scmi_handle *handle, u32 domain,
unsigned long *rate, unsigned long *power);
};
/**
* struct scmi_power_ops - represents the various operations provided
* by SCMI Power Protocol
*
* @num_domains_get: get the count of power domains provided by SCMI
* @name_get: gets the name of a power domain
* @state_set: sets the power state of a power domain
* @state_get: gets the power state of a power domain
*/
struct scmi_power_ops {
int (*num_domains_get)(const struct scmi_handle *handle);
char *(*name_get)(const struct scmi_handle *handle, u32 domain);
#define SCMI_POWER_STATE_TYPE_SHIFT 30
#define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1)
#define SCMI_POWER_STATE_PARAM(type, id) \
((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \
((id) & SCMI_POWER_STATE_ID_MASK))
#define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0)
#define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0)
int (*state_set)(const struct scmi_handle *handle, u32 domain,
u32 state);
int (*state_get)(const struct scmi_handle *handle, u32 domain,
u32 *state);
};
struct scmi_sensor_info {
u32 id;
u8 type;
s8 scale;
u8 num_trip_points;
bool async;
char name[SCMI_MAX_STR_SIZE];
};
/*
* Partial list from Distributed Management Task Force (DMTF) specification:
* DSP0249 (Platform Level Data Model specification)
*/
enum scmi_sensor_class {
NONE = 0x0,
TEMPERATURE_C = 0x2,
VOLTAGE = 0x5,
CURRENT = 0x6,
POWER = 0x7,
ENERGY = 0x8,
};
/**
* struct scmi_sensor_ops - represents the various operations provided
* by SCMI Sensor Protocol
*
* @count_get: get the count of sensors provided by SCMI
* @info_get: get the information of the specified sensor
* @trip_point_notify: control notifications on cross-over events for
* the trip-points
* @trip_point_config: selects and configures a trip-point of interest
* @reading_get: gets the current value of the sensor
*/
struct scmi_sensor_ops {
int (*count_get)(const struct scmi_handle *handle);
const struct scmi_sensor_info *(*info_get)
(const struct scmi_handle *handle, u32 sensor_id);
int (*trip_point_notify)(const struct scmi_handle *handle,
u32 sensor_id, bool enable);
int (*trip_point_config)(const struct scmi_handle *handle,
u32 sensor_id, u8 trip_id, u64 trip_value);
int (*reading_get)(const struct scmi_handle *handle, u32 sensor_id,
u64 *value);
};
/**
* struct scmi_reset_ops - represents the various operations provided
* by SCMI Reset Protocol
*
* @num_domains_get: get the count of reset domains provided by SCMI
* @name_get: gets the name of a reset domain
* @latency_get: gets the reset latency for the specified reset domain
* @reset: resets the specified reset domain
* @assert: explicitly assert reset signal of the specified reset domain
* @deassert: explicitly deassert reset signal of the specified reset domain
*/
struct scmi_reset_ops {
int (*num_domains_get)(const struct scmi_handle *handle);
char *(*name_get)(const struct scmi_handle *handle, u32 domain);
int (*latency_get)(const struct scmi_handle *handle, u32 domain);
int (*reset)(const struct scmi_handle *handle, u32 domain);
int (*assert)(const struct scmi_handle *handle, u32 domain);
int (*deassert)(const struct scmi_handle *handle, u32 domain);
};
/**
* struct scmi_handle - Handle returned to ARM SCMI clients for usage.
*
* @dev: pointer to the SCMI device
* @version: pointer to the structure containing SCMI version information
* @power_ops: pointer to set of power protocol operations
* @perf_ops: pointer to set of performance protocol operations
* @clk_ops: pointer to set of clock protocol operations
* @sensor_ops: pointer to set of sensor protocol operations
* @reset_ops: pointer to set of reset protocol operations
* @perf_priv: pointer to private data structure specific to performance
* protocol(for internal use only)
* @clk_priv: pointer to private data structure specific to clock
* protocol(for internal use only)
* @power_priv: pointer to private data structure specific to power
* protocol(for internal use only)
* @sensor_priv: pointer to private data structure specific to sensors
* protocol(for internal use only)
* @reset_priv: pointer to private data structure specific to reset
* protocol(for internal use only)
*/
struct scmi_handle {
struct device *dev;
struct scmi_revision_info *version;
struct scmi_perf_ops *perf_ops;
struct scmi_clk_ops *clk_ops;
struct scmi_power_ops *power_ops;
struct scmi_sensor_ops *sensor_ops;
struct scmi_reset_ops *reset_ops;
/* for protocol internal use */
void *perf_priv;
void *clk_priv;
void *power_priv;
void *sensor_priv;
void *reset_priv;
};
enum scmi_std_protocol {
SCMI_PROTOCOL_BASE = 0x10,
SCMI_PROTOCOL_POWER = 0x11,
SCMI_PROTOCOL_SYSTEM = 0x12,
SCMI_PROTOCOL_PERF = 0x13,
SCMI_PROTOCOL_CLOCK = 0x14,
SCMI_PROTOCOL_SENSOR = 0x15,
SCMI_PROTOCOL_RESET = 0x16,
};
struct scmi_device {
u32 id;
u8 protocol_id;
struct device dev;
struct scmi_handle *handle;
};
#define to_scmi_dev(d) container_of(d, struct scmi_device, dev)
struct scmi_device *
scmi_device_create(struct device_node *np, struct device *parent, int protocol);
void scmi_device_destroy(struct scmi_device *scmi_dev);
struct scmi_device_id {
u8 protocol_id;
};
struct scmi_driver {
const char *name;
int (*probe)(struct scmi_device *sdev);
void (*remove)(struct scmi_device *sdev);
const struct scmi_device_id *id_table;
struct device_driver driver;
};
#define to_scmi_driver(d) container_of(d, struct scmi_driver, driver)
#ifdef CONFIG_ARM_SCMI_PROTOCOL
int scmi_driver_register(struct scmi_driver *driver,
struct module *owner, const char *mod_name);
void scmi_driver_unregister(struct scmi_driver *driver);
#else
static inline int
scmi_driver_register(struct scmi_driver *driver, struct module *owner,
const char *mod_name)
{
return -EINVAL;
}
static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
#endif /* CONFIG_ARM_SCMI_PROTOCOL */
#define scmi_register(driver) \
scmi_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
#define scmi_unregister(driver) \
scmi_driver_unregister(driver)
/**
* module_scmi_driver() - Helper macro for registering a scmi driver
* @__scmi_driver: scmi_driver structure
*
* Helper macro for scmi drivers to set up proper module init / exit
* functions. Replaces module_init() and module_exit() and keeps people from
* printing pointless things to the kernel log when their driver is loaded.
*/
#define module_scmi_driver(__scmi_driver) \
module_driver(__scmi_driver, scmi_register, scmi_unregister)
typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *);
int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn);
void scmi_protocol_unregister(int protocol_id);
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