292 lines
6.8 KiB
C
292 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Management Interface (SCMI) Sensor Protocol
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*
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* Copyright (C) 2018 ARM Ltd.
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*/
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#include "common.h"
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enum scmi_sensor_protocol_cmd {
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SENSOR_DESCRIPTION_GET = 0x3,
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SENSOR_CONFIG_SET = 0x4,
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SENSOR_TRIP_POINT_SET = 0x5,
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SENSOR_READING_GET = 0x6,
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};
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struct scmi_msg_resp_sensor_attributes {
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__le16 num_sensors;
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u8 max_requests;
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u8 reserved;
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__le32 reg_addr_low;
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__le32 reg_addr_high;
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__le32 reg_size;
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};
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struct scmi_msg_resp_sensor_description {
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__le16 num_returned;
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__le16 num_remaining;
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struct {
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__le32 id;
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__le32 attributes_low;
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#define SUPPORTS_ASYNC_READ(x) ((x) & BIT(31))
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#define NUM_TRIP_POINTS(x) (((x) >> 4) & 0xff)
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__le32 attributes_high;
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#define SENSOR_TYPE(x) ((x) & 0xff)
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#define SENSOR_SCALE(x) (((x) >> 11) & 0x3f)
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#define SENSOR_UPDATE_SCALE(x) (((x) >> 22) & 0x1f)
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#define SENSOR_UPDATE_BASE(x) (((x) >> 27) & 0x1f)
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u8 name[SCMI_MAX_STR_SIZE];
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} desc[0];
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};
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struct scmi_msg_set_sensor_config {
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__le32 id;
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__le32 event_control;
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};
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struct scmi_msg_set_sensor_trip_point {
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__le32 id;
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__le32 event_control;
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#define SENSOR_TP_EVENT_MASK (0x3)
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#define SENSOR_TP_DISABLED 0x0
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#define SENSOR_TP_POSITIVE 0x1
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#define SENSOR_TP_NEGATIVE 0x2
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#define SENSOR_TP_BOTH 0x3
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#define SENSOR_TP_ID(x) (((x) & 0xff) << 4)
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__le32 value_low;
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__le32 value_high;
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};
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struct scmi_msg_sensor_reading_get {
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__le32 id;
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__le32 flags;
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#define SENSOR_READ_ASYNC BIT(0)
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};
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struct sensors_info {
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int num_sensors;
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int max_requests;
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u64 reg_addr;
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u32 reg_size;
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struct scmi_sensor_info *sensors;
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};
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static int scmi_sensor_attributes_get(const struct scmi_handle *handle,
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struct sensors_info *si)
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{
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int ret;
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struct scmi_xfer *t;
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struct scmi_msg_resp_sensor_attributes *attr;
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ret = scmi_one_xfer_init(handle, PROTOCOL_ATTRIBUTES,
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SCMI_PROTOCOL_SENSOR, 0, sizeof(*attr), &t);
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if (ret)
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return ret;
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attr = t->rx.buf;
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ret = scmi_do_xfer(handle, t);
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if (!ret) {
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si->num_sensors = le16_to_cpu(attr->num_sensors);
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si->max_requests = attr->max_requests;
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si->reg_addr = le32_to_cpu(attr->reg_addr_low) |
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(u64)le32_to_cpu(attr->reg_addr_high) << 32;
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si->reg_size = le32_to_cpu(attr->reg_size);
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}
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scmi_one_xfer_put(handle, t);
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return ret;
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}
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static int scmi_sensor_description_get(const struct scmi_handle *handle,
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struct sensors_info *si)
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{
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int ret, cnt;
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u32 desc_index = 0;
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u16 num_returned, num_remaining;
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struct scmi_xfer *t;
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struct scmi_msg_resp_sensor_description *buf;
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ret = scmi_one_xfer_init(handle, SENSOR_DESCRIPTION_GET,
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SCMI_PROTOCOL_SENSOR, sizeof(__le32), 0, &t);
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if (ret)
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return ret;
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buf = t->rx.buf;
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do {
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/* Set the number of sensors to be skipped/already read */
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*(__le32 *)t->tx.buf = cpu_to_le32(desc_index);
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ret = scmi_do_xfer(handle, t);
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if (ret)
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break;
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num_returned = le16_to_cpu(buf->num_returned);
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num_remaining = le16_to_cpu(buf->num_remaining);
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if (desc_index + num_returned > si->num_sensors) {
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dev_err(handle->dev, "No. of sensors can't exceed %d",
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si->num_sensors);
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break;
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}
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for (cnt = 0; cnt < num_returned; cnt++) {
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u32 attrh;
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struct scmi_sensor_info *s;
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attrh = le32_to_cpu(buf->desc[cnt].attributes_high);
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s = &si->sensors[desc_index + cnt];
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s->id = le32_to_cpu(buf->desc[cnt].id);
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s->type = SENSOR_TYPE(attrh);
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memcpy(s->name, buf->desc[cnt].name, SCMI_MAX_STR_SIZE);
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}
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desc_index += num_returned;
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/*
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* check for both returned and remaining to avoid infinite
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* loop due to buggy firmware
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*/
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} while (num_returned && num_remaining);
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scmi_one_xfer_put(handle, t);
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return ret;
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}
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static int
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scmi_sensor_configuration_set(const struct scmi_handle *handle, u32 sensor_id)
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{
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int ret;
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u32 evt_cntl = BIT(0);
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struct scmi_xfer *t;
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struct scmi_msg_set_sensor_config *cfg;
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ret = scmi_one_xfer_init(handle, SENSOR_CONFIG_SET,
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SCMI_PROTOCOL_SENSOR, sizeof(*cfg), 0, &t);
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if (ret)
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return ret;
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cfg = t->tx.buf;
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cfg->id = cpu_to_le32(sensor_id);
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cfg->event_control = cpu_to_le32(evt_cntl);
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ret = scmi_do_xfer(handle, t);
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scmi_one_xfer_put(handle, t);
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return ret;
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}
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static int scmi_sensor_trip_point_set(const struct scmi_handle *handle,
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u32 sensor_id, u8 trip_id, u64 trip_value)
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{
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int ret;
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u32 evt_cntl = SENSOR_TP_BOTH;
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struct scmi_xfer *t;
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struct scmi_msg_set_sensor_trip_point *trip;
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ret = scmi_one_xfer_init(handle, SENSOR_TRIP_POINT_SET,
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SCMI_PROTOCOL_SENSOR, sizeof(*trip), 0, &t);
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if (ret)
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return ret;
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trip = t->tx.buf;
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trip->id = cpu_to_le32(sensor_id);
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trip->event_control = cpu_to_le32(evt_cntl | SENSOR_TP_ID(trip_id));
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trip->value_low = cpu_to_le32(trip_value & 0xffffffff);
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trip->value_high = cpu_to_le32(trip_value >> 32);
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ret = scmi_do_xfer(handle, t);
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scmi_one_xfer_put(handle, t);
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return ret;
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}
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static int scmi_sensor_reading_get(const struct scmi_handle *handle,
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u32 sensor_id, bool async, u64 *value)
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{
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int ret;
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struct scmi_xfer *t;
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struct scmi_msg_sensor_reading_get *sensor;
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ret = scmi_one_xfer_init(handle, SENSOR_READING_GET,
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SCMI_PROTOCOL_SENSOR, sizeof(*sensor),
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sizeof(u64), &t);
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if (ret)
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return ret;
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sensor = t->tx.buf;
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sensor->id = cpu_to_le32(sensor_id);
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sensor->flags = cpu_to_le32(async ? SENSOR_READ_ASYNC : 0);
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ret = scmi_do_xfer(handle, t);
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if (!ret) {
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__le32 *pval = t->rx.buf;
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*value = le32_to_cpu(*pval);
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*value |= (u64)le32_to_cpu(*(pval + 1)) << 32;
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}
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scmi_one_xfer_put(handle, t);
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return ret;
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}
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static const struct scmi_sensor_info *
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scmi_sensor_info_get(const struct scmi_handle *handle, u32 sensor_id)
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{
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struct sensors_info *si = handle->sensor_priv;
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return si->sensors + sensor_id;
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}
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static int scmi_sensor_count_get(const struct scmi_handle *handle)
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{
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struct sensors_info *si = handle->sensor_priv;
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return si->num_sensors;
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}
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static struct scmi_sensor_ops sensor_ops = {
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.count_get = scmi_sensor_count_get,
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.info_get = scmi_sensor_info_get,
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.configuration_set = scmi_sensor_configuration_set,
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.trip_point_set = scmi_sensor_trip_point_set,
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.reading_get = scmi_sensor_reading_get,
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};
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static int scmi_sensors_protocol_init(struct scmi_handle *handle)
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{
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u32 version;
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struct sensors_info *sinfo;
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scmi_version_get(handle, SCMI_PROTOCOL_SENSOR, &version);
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dev_dbg(handle->dev, "Sensor Version %d.%d\n",
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PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
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sinfo = devm_kzalloc(handle->dev, sizeof(*sinfo), GFP_KERNEL);
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if (!sinfo)
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return -ENOMEM;
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scmi_sensor_attributes_get(handle, sinfo);
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sinfo->sensors = devm_kcalloc(handle->dev, sinfo->num_sensors,
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sizeof(*sinfo->sensors), GFP_KERNEL);
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if (!sinfo->sensors)
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return -ENOMEM;
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scmi_sensor_description_get(handle, sinfo);
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handle->sensor_ops = &sensor_ops;
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handle->sensor_priv = sinfo;
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return 0;
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}
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static int __init scmi_sensors_init(void)
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{
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return scmi_protocol_register(SCMI_PROTOCOL_SENSOR,
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&scmi_sensors_protocol_init);
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}
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subsys_initcall(scmi_sensors_init);
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