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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2016-2018 Mellanox Technologies. All rights reserved
* Copyright (c) 2016 Ivan Vecera <cera@cera.cz>
*/
#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
/* Minimum and maximum fan allowed speed in percent: from 20% to 100%. Values
* MLXSW_THERMAL_MAX_STATE + x, where x is between 2 and 10 are used for
* setting fan speed dynamic minimum. For example, if value is set to 14 (40%)
* cooling levels vector will be set to 4, 4, 4, 4, 4, 5, 6, 7, 8, 9, 10 to
* introduce PWM speed in percent: 40, 40, 40, 40, 40, 50, 60. 70, 80, 90, 100.
*/
#define MLXSW_THERMAL_SPEED_MIN (MLXSW_THERMAL_MAX_STATE + 2)
#define MLXSW_THERMAL_SPEED_MAX (MLXSW_THERMAL_MAX_STATE * 2)
#define MLXSW_THERMAL_SPEED_MIN_LEVEL 2 /* 20% */
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];
u8 cooling_levels[MLXSW_THERMAL_MAX_STATE + 1];
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,
.
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