From e2083d36739168f7b612312160cf7bb45b251408 Mon Sep 17 00:00:00 2001 From: Cristian Marussi Date: Thu, 19 Nov 2020 17:49:04 +0000 Subject: [PATCH] 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 Signed-off-by: Sudeep Holla --- drivers/firmware/arm_scmi/sensors.c | 127 ++++++++++++++++++++++++++-- include/linux/scmi_protocol.h | 22 +++++ 2 files changed, 143 insertions(+), 6 deletions(-) diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c index a85827f60a02..2239af5f9e6e 100644 --- a/drivers/firmware/arm_scmi/sensors.c +++ b/drivers/firmware/arm_scmi/sensors.c @@ -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, diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h index 0792b0be25a3..0c52bf0cbee4 100644 --- a/include/linux/scmi_protocol.h +++ b/include/linux/scmi_protocol.h @@ -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); }; /**