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firmware: arm_scmi: Add SCMI v3.0 sensors timestamped reads 

Add new .reading_get_timestamped() method to sensor_ops to support SCMI v3.0
timestamped reads.

Link: https://lore.kernel.org/r/20201119174906.43862-5-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2020-11-19 17:49:04 +00:00 committed by Sudeep Holla
parent d7971d57d2
commit e2083d3673
2 changed files with 143 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

127
drivers/firmware/arm_scmi/sensors.c
View File

@ -155,6 +155,23 @@ struct scmi_msg_sensor_reading_get {
#define SENSOR_READ_ASYNC BIT(0)
};
struct scmi_resp_sensor_reading_complete {
__le32 id;
__le64 readings;
};
struct scmi_sensor_reading_le {
__le32 sensor_value_low;
__le32 sensor_value_high;
__le32 timestamp_low;
__le32 timestamp_high;
};
struct scmi_resp_sensor_reading_complete_v3 {
__le32 id;
struct scmi_sensor_reading_le readings[];
};
struct scmi_sensor_trip_notify_payld {
__le32 agent_id;
__le32 sensor_id;
@ -575,6 +592,21 @@ scmi_sensor_trip_point_config(const struct scmi_handle *handle, u32 sensor_id,
return ret;
}
/**
* scmi_sensor_reading_get - Read scalar sensor value
* @handle: Platform handle
* @sensor_id: Sensor ID
* @value: The 64bit value sensor reading
*
* This function returns a single 64 bit reading value representing the sensor
* value; if the platform SCMI Protocol implementation and the sensor support
* multiple axis and timestamped-reads, this just returns the first axis while
* dropping the timestamp value.
* Use instead the @scmi_sensor_reading_get_timestamped to retrieve the array of
* timestamped multi-axis values.
*
* Return: 0 on Success
*/
static int scmi_sensor_reading_get(const struct scmi_handle *handle,
u32 sensor_id, u64 *value)
{
@ -585,20 +617,24 @@ static int scmi_sensor_reading_get(const struct scmi_handle *handle,
struct scmi_sensor_info *s = si->sensors + sensor_id;
ret = scmi_xfer_get_init(handle, SENSOR_READING_GET,
SCMI_PROTOCOL_SENSOR, sizeof(*sensor),
sizeof(u64), &t);
SCMI_PROTOCOL_SENSOR, sizeof(*sensor), 0, &t);
if (ret)
return ret;
sensor = t->tx.buf;
sensor->id = cpu_to_le32(sensor_id);
if (s->async) {
sensor->flags = cpu_to_le32(SENSOR_READ_ASYNC);
ret = scmi_do_xfer_with_response(handle, t);
if (!ret)
*value = get_unaligned_le64((void *)
((__le32 *)t->rx.buf + 1));
if (!ret) {
struct scmi_resp_sensor_reading_complete *resp;
resp = t->rx.buf;
if (le32_to_cpu(resp->id) == sensor_id)
*value = get_unaligned_le64(&resp->readings);
else
ret = -EPROTO;
}
} else {
sensor->flags = cpu_to_le32(0);
ret = scmi_do_xfer(handle, t);
@ -610,6 +646,84 @@ static int scmi_sensor_reading_get(const struct scmi_handle *handle,
return ret;
}
static inline void
scmi_parse_sensor_readings(struct scmi_sensor_reading *out,
const struct scmi_sensor_reading_le *in)
{
out->value = get_unaligned_le64((void *)&in->sensor_value_low);
out->timestamp = get_unaligned_le64((void *)&in->timestamp_low);
}
/**
* scmi_sensor_reading_get_timestamped - Read multiple-axis timestamped values
* @handle: Platform handle
* @sensor_id: Sensor ID
* @count: The length of the provided @readings array
* @readings: An array of elements each representing a timestamped per-axis
* reading of type @struct scmi_sensor_reading.
* Returned readings are ordered as the @axis descriptors array
* included in @struct scmi_sensor_info and the max number of
* returned elements is min(@count, @num_axis); ideally the provided
* array should be of length @count equal to @num_axis.
*
* Return: 0 on Success
*/
static int
scmi_sensor_reading_get_timestamped(const struct scmi_handle *handle,
u32 sensor_id, u8 count,
struct scmi_sensor_reading *readings)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_sensor_reading_get *sensor;
struct sensors_info *si = handle->sensor_priv;
struct scmi_sensor_info *s = si->sensors + sensor_id;
if (!count || !readings ||
(!s->num_axis && count > 1) || (s->num_axis && count > s->num_axis))
return -EINVAL;
ret = scmi_xfer_get_init(handle, SENSOR_READING_GET,
SCMI_PROTOCOL_SENSOR, sizeof(*sensor), 0, &t);
if (ret)
return ret;
sensor = t->tx.buf;
sensor->id = cpu_to_le32(sensor_id);
if (s->async) {
sensor->flags = cpu_to_le32(SENSOR_READ_ASYNC);
ret = scmi_do_xfer_with_response(handle, t);
if (!ret) {
int i;
struct scmi_resp_sensor_reading_complete_v3 *resp;
resp = t->rx.buf;
/* Retrieve only the number of requested axis anyway */
if (le32_to_cpu(resp->id) == sensor_id)
for (i = 0; i < count; i++)
scmi_parse_sensor_readings(&readings[i],
&resp->readings[i]);
else
ret = -EPROTO;
}
} else {
sensor->flags = cpu_to_le32(0);
ret = scmi_do_xfer(handle, t);
if (!ret) {
int i;
struct scmi_sensor_reading_le *resp_readings;
resp_readings = t->rx.buf;
for (i = 0; i < count; i++)
scmi_parse_sensor_readings(&readings[i],
&resp_readings[i]);
}
}
scmi_xfer_put(handle, t);
return ret;
}
static const struct scmi_sensor_info *
scmi_sensor_info_get(const struct scmi_handle *handle, u32 sensor_id)
{
@ -630,6 +744,7 @@ static const struct scmi_sensor_ops sensor_ops = {
.info_get = scmi_sensor_info_get,
.trip_point_config = scmi_sensor_trip_point_config,
.reading_get = scmi_sensor_reading_get,
.reading_get_timestamped = scmi_sensor_reading_get_timestamped,
};
static int scmi_sensor_set_notify_enabled(const struct scmi_handle *handle,

22
include/linux/scmi_protocol.h
View File

@ -149,6 +149,20 @@ struct scmi_power_ops {
u32 *state);
};
/**
* scmi_sensor_reading - represent a timestamped read
*
* Used by @reading_get_timestamped method.
*
* @value: The signed value sensor read.
* @timestamp: An unsigned timestamp for the sensor read, as provided by
* SCMI platform. Set to zero when not available.
*/
struct scmi_sensor_reading {
long long value;
unsigned long long timestamp;
};
/**
* scmi_range_attrs - specifies a sensor or axis values' range
* @min_range: The minimum value which can be represented by the sensor/axis.
@ -390,6 +404,11 @@ enum scmi_sensor_class {
* @info_get: get the information of the specified sensor
* @trip_point_config: selects and configures a trip-point of interest
* @reading_get: gets the current value of the sensor
* @reading_get_timestamped: gets the current value and timestamp, when
* available, of the sensor. (as of v3.0 spec)
* Supports multi-axis sensors for sensors which
* supports it and if the @reading array size of
* @count entry equals the sensor num_axis
*/
struct scmi_sensor_ops {
int (*count_get)(const struct scmi_handle *handle);
@ -399,6 +418,9 @@ struct scmi_sensor_ops {
u32 sensor_id, u8 trip_id, u64 trip_value);
int (*reading_get)(const struct scmi_handle *handle, u32 sensor_id,
u64 *value);
int (*reading_get_timestamped)(const struct scmi_handle *handle,
u32 sensor_id, u8 count,
struct scmi_sensor_reading *readings);
};
/**