--- /dev/null
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+ * Copyright (c) 2016 Ivan Vecera <cera@cera.cz>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include <linux/thermal.h>
+#include <linux/err.h>
+
+#include "core.h"
+
+#define MLXSW_THERMAL_POLL_INT 1000 /* ms */
+#define MLXSW_THERMAL_MAX_TEMP 110000 /* 110C */
+#define MLXSW_THERMAL_MAX_STATE 10
+#define MLXSW_THERMAL_MAX_DUTY 255
+
+struct mlxsw_thermal_trip {
+ int type;
+ int temp;
+ int min_state;
+ int max_state;
+};
+
+static const struct mlxsw_thermal_trip default_thermal_trips[] = {
+ { /* In range - 0-40% PWM */
+ .type = THERMAL_TRIP_ACTIVE,
+ .temp = 75000,
+ .min_state = 0,
+ .max_state = (4 * MLXSW_THERMAL_MAX_STATE) / 10,
+ },
+ { /* High - 40-100% PWM */
+ .type = THERMAL_TRIP_ACTIVE,
+ .temp = 80000,
+ .min_state = (4 * MLXSW_THERMAL_MAX_STATE) / 10,
+ .max_state = MLXSW_THERMAL_MAX_STATE,
+ },
+ {
+ /* Very high - 100% PWM */
+ .type = THERMAL_TRIP_ACTIVE,
+ .temp = 85000,
+ .min_state = MLXSW_THERMAL_MAX_STATE,
+ .max_state = MLXSW_THERMAL_MAX_STATE,
+ },
+ { /* Warning */
+ .type = THERMAL_TRIP_HOT,
+ .temp = 105000,
+ .min_state = MLXSW_THERMAL_MAX_STATE,
+ .max_state = MLXSW_THERMAL_MAX_STATE,
+ },
+ { /* Critical - soft poweroff */
+ .type = THERMAL_TRIP_CRITICAL,
+ .temp = MLXSW_THERMAL_MAX_TEMP,
+ .min_state = MLXSW_THERMAL_MAX_STATE,
+ .max_state = MLXSW_THERMAL_MAX_STATE,
+ }
+};
+
+#define MLXSW_THERMAL_NUM_TRIPS ARRAY_SIZE(default_thermal_trips)
+
+/* Make sure all trips are writable */
+#define MLXSW_THERMAL_TRIP_MASK (BIT(MLXSW_THERMAL_NUM_TRIPS) - 1)
+
+struct mlxsw_thermal {
+ struct mlxsw_core *core;
+ const struct mlxsw_bus_info *bus_info;
+ struct thermal_zone_device *tzdev;
+ struct thermal_cooling_device *cdevs[MLXSW_MFCR_PWMS_MAX];
+ struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
+ enum thermal_device_mode mode;
+};
+
+static inline u8 mlxsw_state_to_duty(int state)
+{
+ return DIV_ROUND_CLOSEST(state * MLXSW_THERMAL_MAX_DUTY,
+ MLXSW_THERMAL_MAX_STATE);
+}
+
+static inline int mlxsw_duty_to_state(u8 duty)
+{
+ return DIV_ROUND_CLOSEST(duty * MLXSW_THERMAL_MAX_STATE,
+ MLXSW_THERMAL_MAX_DUTY);
+}
+
+static int mlxsw_get_cooling_device_idx(struct mlxsw_thermal *thermal,
+ struct thermal_cooling_device *cdev)
+{
+ int i;
+
+ for (i = 0; i < MLXSW_MFCR_PWMS_MAX; i++)
+ if (thermal->cdevs[i] == cdev)
+ return i;
+
+ return -ENODEV;
+}
+
+static int mlxsw_thermal_bind(struct thermal_zone_device *tzdev,
+ struct thermal_cooling_device *cdev)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+ struct device *dev = thermal->bus_info->dev;
+ int i, err;
+
+ /* If the cooling device is one of ours bind it */
+ if (mlxsw_get_cooling_device_idx(thermal, cdev) < 0)
+ return 0;
+
+ for (i = 0; i < MLXSW_THERMAL_NUM_TRIPS; i++) {
+ const struct mlxsw_thermal_trip *trip = &thermal->trips[i];
+
+ err = thermal_zone_bind_cooling_device(tzdev, i, cdev,
+ trip->max_state,
+ trip->min_state,
+ THERMAL_WEIGHT_DEFAULT);
+ if (err < 0) {
+ dev_err(dev, "Failed to bind cooling device to trip %d\n", i);
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int mlxsw_thermal_unbind(struct thermal_zone_device *tzdev,
+ struct thermal_cooling_device *cdev)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+ struct device *dev = thermal->bus_info->dev;
+ int i;
+ int err;
+
+ /* If the cooling device is our one unbind it */
+ if (mlxsw_get_cooling_device_idx(thermal, cdev) < 0)
+ return 0;
+
+ for (i = 0; i < MLXSW_THERMAL_NUM_TRIPS; i++) {
+ err = thermal_zone_unbind_cooling_device(tzdev, i, cdev);
+ if (err < 0) {
+ dev_err(dev, "Failed to unbind cooling device\n");
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int mlxsw_thermal_get_mode(struct thermal_zone_device *tzdev,
+ enum thermal_device_mode *mode)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+
+ *mode = thermal->mode;
+
+ return 0;
+}
+
+static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
+ enum thermal_device_mode mode)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+
+ mutex_lock(&tzdev->lock);
+
+ if (mode == THERMAL_DEVICE_ENABLED)
+ tzdev->polling_delay = MLXSW_THERMAL_POLL_INT;
+ else
+ tzdev->polling_delay = 0;
+
+ mutex_unlock(&tzdev->lock);
+
+ thermal->mode = mode;
+ thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
+
+ return 0;
+}
+
+static int mlxsw_thermal_get_temp(struct thermal_zone_device *tzdev,
+ int *p_temp)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+ struct device *dev = thermal->bus_info->dev;
+ char mtmp_pl[MLXSW_REG_MTMP_LEN];
+ unsigned int temp;
+ int err;
+
+ mlxsw_reg_mtmp_pack(mtmp_pl, 0, false, false);
+
+ err = mlxsw_reg_query(thermal->core, MLXSW_REG(mtmp), mtmp_pl);
+ if (err) {
+ dev_err(dev, "Failed to query temp sensor\n");
+ return err;
+ }
+ mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL);
+
+ *p_temp = (int) temp;
+ return 0;
+}
+
+static int mlxsw_thermal_get_trip_type(struct thermal_zone_device *tzdev,
+ int trip,
+ enum thermal_trip_type *p_type)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+
+ if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
+ return -EINVAL;
+
+ *p_type = thermal->trips[trip].type;
+ return 0;
+}
+
+static int mlxsw_thermal_get_trip_temp(struct thermal_zone_device *tzdev,
+ int trip, int *p_temp)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+
+ if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
+ return -EINVAL;
+
+ *p_temp = thermal->trips[trip].temp;
+ return 0;
+}
+
+static int mlxsw_thermal_set_trip_temp(struct thermal_zone_device *tzdev,
+ int trip, int temp)
+{
+ struct mlxsw_thermal *thermal = tzdev->devdata;
+
+ if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS ||
+ temp > MLXSW_THERMAL_MAX_TEMP)
+ return -EINVAL;
+
+ thermal->trips[trip].temp = temp;
+ return 0;
+}
+
+static struct thermal_zone_device_ops mlxsw_thermal_ops = {
+ .bind = mlxsw_thermal_bind,
+ .unbind = mlxsw_thermal_unbind,
+ .get_mode = mlxsw_thermal_get_mode,
+ .set_mode = mlxsw_thermal_set_mode,
+ .get_temp = mlxsw_thermal_get_temp,
+ .get_trip_type = mlxsw_thermal_get_trip_type,
+ .get_trip_temp = mlxsw_thermal_get_trip_temp,
+ .set_trip_temp = mlxsw_thermal_set_trip_temp,
+};
+
+static int mlxsw_thermal_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *p_state)
+{
+ *p_state = MLXSW_THERMAL_MAX_STATE;
+ return 0;
+}
+
+static int mlxsw_thermal_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *p_state)
+
+{
+ struct mlxsw_thermal *thermal = cdev->devdata;
+ struct device *dev = thermal->bus_info->dev;
+ char mfsc_pl[MLXSW_REG_MFSC_LEN];
+ int err, idx;
+ u8 duty;
+
+ idx = mlxsw_get_cooling_device_idx(thermal, cdev);
+ if (idx < 0)
+ return idx;
+
+ mlxsw_reg_mfsc_pack(mfsc_pl, idx, 0);
+ err = mlxsw_reg_query(thermal->core, MLXSW_REG(mfsc), mfsc_pl);
+ if (err) {
+ dev_err(dev, "Failed to query PWM duty\n");
+ return err;
+ }
+
+ duty = mlxsw_reg_mfsc_pwm_duty_cycle_get(mfsc_pl);
+ *p_state = mlxsw_duty_to_state(duty);
+ return 0;
+}
+
+static int mlxsw_thermal_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+
+{
+ struct mlxsw_thermal *thermal = cdev->devdata;
+ struct device *dev = thermal->bus_info->dev;
+ char mfsc_pl[MLXSW_REG_MFSC_LEN];
+ int err, idx;
+
+ idx = mlxsw_get_cooling_device_idx(thermal, cdev);
+ if (idx < 0)
+ return idx;
+
+ mlxsw_reg_mfsc_pack(mfsc_pl, idx, mlxsw_state_to_duty(state));
+ err = mlxsw_reg_write(thermal->core, MLXSW_REG(mfsc), mfsc_pl);
+ if (err) {
+ dev_err(dev, "Failed to write PWM duty\n");
+ return err;
+ }
+ return 0;
+}
+
+static const struct thermal_cooling_device_ops mlxsw_cooling_ops = {
+ .get_max_state = mlxsw_thermal_get_max_state,
+ .get_cur_state = mlxsw_thermal_get_cur_state,
+ .set_cur_state = mlxsw_thermal_set_cur_state,
+};
+
+int mlxsw_thermal_init(struct mlxsw_core *core,
+ const struct mlxsw_bus_info *bus_info,
+ struct mlxsw_thermal **p_thermal)
+{
+ char mfcr_pl[MLXSW_REG_MFCR_LEN] = { 0 };
+ enum mlxsw_reg_mfcr_pwm_frequency freq;
+ struct device *dev = bus_info->dev;
+ struct mlxsw_thermal *thermal;
+ u16 tacho_active;
+ u8 pwm_active;
+ int err, i;
+
+ thermal = devm_kzalloc(dev, sizeof(*thermal),
+ GFP_KERNEL);
+ if (!thermal)
+ return -ENOMEM;
+
+ thermal->core = core;
+ thermal->bus_info = bus_info;
+ memcpy(thermal->trips, default_thermal_trips, sizeof(thermal->trips));
+
+ err = mlxsw_reg_query(thermal->core, MLXSW_REG(mfcr), mfcr_pl);
+ if (err) {
+ dev_err(dev, "Failed to probe PWMs\n");
+ goto err_free_thermal;
+ }
+ mlxsw_reg_mfcr_unpack(mfcr_pl, &freq, &tacho_active, &pwm_active);
+
+ for (i = 0; i < MLXSW_MFCR_TACHOS_MAX; i++) {
+ if (tacho_active & BIT(i)) {
+ char mfsl_pl[MLXSW_REG_MFSL_LEN];
+
+ mlxsw_reg_mfsl_pack(mfsl_pl, i, 0, 0);
+
+ /* We need to query the register to preserve maximum */
+ err = mlxsw_reg_query(thermal->core, MLXSW_REG(mfsl),
+ mfsl_pl);
+ if (err)
+ goto err_free_thermal;
+
+ /* set the minimal RPMs to 0 */
+ mlxsw_reg_mfsl_tach_min_set(mfsl_pl, 0);
+ err = mlxsw_reg_write(thermal->core, MLXSW_REG(mfsl),
+ mfsl_pl);
+ if (err)
+ goto err_free_thermal;
+ }
+ }
+ for (i = 0; i < MLXSW_MFCR_PWMS_MAX; i++) {
+ if (pwm_active & BIT(i)) {
+ struct thermal_cooling_device *cdev;
+
+ cdev = thermal_cooling_device_register("Fan", thermal,
+ &mlxsw_cooling_ops);
+ if (IS_ERR(cdev)) {
+ err = PTR_ERR(cdev);
+ dev_err(dev, "Failed to register cooling device\n");
+ goto err_unreg_cdevs;
+ }
+ thermal->cdevs[i] = cdev;
+ }
+ }
+
+ thermal->tzdev = thermal_zone_device_register("mlxsw",
+ MLXSW_THERMAL_NUM_TRIPS,
+ MLXSW_THERMAL_TRIP_MASK,
+ thermal,
+ &mlxsw_thermal_ops,
+ NULL, 0,
+ MLXSW_THERMAL_POLL_INT);
+ if (IS_ERR(thermal->tzdev)) {
+ err = PTR_ERR(thermal->tzdev);
+ dev_err(dev, "Failed to register thermal zone\n");
+ goto err_unreg_cdevs;
+ }
+
+ thermal->mode = THERMAL_DEVICE_ENABLED;
+ *p_thermal = thermal;
+ return 0;
+err_unreg_cdevs:
+ for (i = 0; i < MLXSW_MFCR_PWMS_MAX; i++)
+ if (thermal->cdevs[i])
+ thermal_cooling_device_unregister(thermal->cdevs[i]);
+err_free_thermal:
+ devm_kfree(dev, thermal);
+ return err;
+}
+
+void mlxsw_thermal_fini(struct mlxsw_thermal *thermal)
+{
+ int i;
+
+ if (thermal->tzdev) {
+ thermal_zone_device_unregister(thermal->tzdev);
+ thermal->tzdev = NULL;
+ }
+
+ for (i = 0; i < MLXSW_MFCR_PWMS_MAX; i++) {
+ if (thermal->cdevs[i]) {
+ thermal_cooling_device_unregister(thermal->cdevs[i]);
+ thermal->cdevs[i] = NULL;
+ }
+ }
+
+ devm_kfree(thermal->bus_info->dev, thermal);
+}
projects / openwrt / staging / blogic.git / commitdiff