diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlxsw/core_thermal.c')
-rw-r--r-- | drivers/net/ethernet/mellanox/mlxsw/core_thermal.c | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c new file mode 100644 index 000000000000..d866c98c1a97 --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c @@ -0,0 +1,442 @@ +/* + * 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); +} |