// 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 <linux/sfp.h>
#include "core.h"
#include "core_env.h"
#define MLXSW_THERMAL_POLL_INT 1000 /* ms */
#define MLXSW_THERMAL_SLOW_POLL_INT 20000 /* ms */
#define MLXSW_THERMAL_ASIC_TEMP_NORM 75000 /* 75C */
#define MLXSW_THERMAL_ASIC_TEMP_HIGH 85000 /* 85C */
#define MLXSW_THERMAL_ASIC_TEMP_HOT 105000 /* 105C */
#define MLXSW_THERMAL_ASIC_TEMP_CRIT 110000 /* 110C */
#define MLXSW_THERMAL_HYSTERESIS_TEMP 5000 /* 5C */
#define MLXSW_THERMAL_MODULE_TEMP_SHIFT (MLXSW_THERMAL_HYSTERESIS_TEMP * 2)
#define MLXSW_THERMAL_ZONE_MAX_NAME 16
#define MLXSW_THERMAL_TEMP_SCORE_MAX GENMASK(31, 0)
#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% */
/* External cooling devices, allowed for binding to mlxsw thermal zones. */
static char * const mlxsw_thermal_external_allowed_cdev[] = {
"mlxreg_fan",
};
enum mlxsw_thermal_trips {
MLXSW_THERMAL_TEMP_TRIP_NORM,
MLXSW_THERMAL_TEMP_TRIP_HIGH,
MLXSW_THERMAL_TEMP_TRIP_HOT,
MLXSW_THERMAL_TEMP_TRIP_CRIT,
};
struct mlxsw_thermal_trip {
int type;
int temp;
int hyst;
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 = MLXSW_THERMAL_ASIC_TEMP_NORM,
.hyst = MLXSW_THERMAL_HYSTERESIS_TEMP,
.min_state = 0,
.max_state = (4 * MLXSW_THERMAL_MAX_STATE) / 10,
},
{
/* In range - 40-100% PWM */
.type = THERMAL_TRIP_ACTIVE,
.temp = MLXSW_THERMAL_ASIC_TEMP_HIGH,
.hyst = MLXSW_THERMAL_HYSTERESIS_TEMP,
.min_state = (4 * MLXSW_THERMAL_MAX_STATE) / 10,
.max_state = MLXSW_THERMAL_MAX_STATE,
},
{ /* Warning */
.type = THERMAL_TRIP_HOT,
.temp = MLXSW_THERMAL_ASIC_TEMP_HOT,
.hyst = MLXSW_THERMAL_HYSTERESIS_TEMP,
.min_state = MLXSW_THERMAL_MAX_STATE,
.max_state = MLXSW_THERMAL_MAX_STATE,
},
{ /* Critical - soft poweroff */
.type = THERMAL_TRIP_CRITICAL,
.temp = MLXSW_THERMAL_ASIC_TEMP_CRIT,
.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_thermal_module {
struct mlxsw_thermal *parent;
struct thermal_zone_device *tzdev;
struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
enum thermal_device_mode mode;
int module; /* Module or gearbox number */
};
struct mlxsw_thermal {
struct mlxsw_core *core;
const struct mlxsw_bus_info *bus_info;
struct thermal_zone_device *tzdev;
int polling_delay;
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;
struct mlxsw_thermal_module *tz_module_arr;
struct mlxsw_thermal_module *tz_gearbox_arr;
u8 tz_gearbox_num;
unsigned int tz_highest_score;
struct thermal_zone_device *tz_highest_dev;
};
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;
/* Allow mlxsw thermal zone binding to an external cooling device */
for (i = 0; i < ARRAY_SIZE(mlxsw_thermal_external_allowed_cdev); i++) {
if (strnstr(cdev->type, mlxsw_thermal_external_allowed_cdev[i],
sizeof(cdev->type)))
return 0;
}
return -ENODEV;
}
static void
mlxsw_thermal_module_trips_reset(struct mlxsw_thermal_module *tz)
{
tz->trips[MLXSW_THERMAL_TEMP_TRIP_NORM].temp = 0;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HIGH].temp = 0;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HOT].temp = 0;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = 0;
}
static int
mlxsw_thermal_module_trips_update(struct device *dev, struct mlxsw_core *core,
struct mlxsw_thermal_module *tz)
{
int crit_temp, emerg_temp;
int err;
err = mlxsw_env_module_temp_thresholds_get(core, tz->module,
SFP_TEMP_HIGH_WARN,
&crit_temp);
if (err)
return err;
err = mlxsw_env_module_temp_thresholds_get(core, tz->module,
SFP_TEMP_HIGH_ALARM,
&emerg_temp);
if (err)
return err;
/* According to the system thermal requirements, the thermal zones are
* defined with four trip points. The critical and emergency
* temperature thresholds, provided by QSFP module are set as "active"
* and "hot" trip points, "normal" and "critical" trip points are
* derived from "active" and "hot" by subtracting or adding double
* hysteresis value.
*/
if (crit_temp >= MLXSW_THERMAL_MODULE_TEMP_SHIFT)
tz->trips[MLXSW_THERMAL_TEMP_TRIP_NORM].temp = crit_temp -
MLXSW_THERMAL_MODULE_TEMP_SHIFT;
else
tz->trips[MLXSW_THERMAL_TEMP_TRIP_NORM].temp = crit_temp;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HIGH].temp = crit_temp;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HOT].temp = emerg_temp;
if (emerg_temp > crit_temp)
tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = emerg_temp +
MLXSW_THERMAL_MODULE_TEMP_SHIFT;
else
tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = emerg_temp;
return 0;
}
static void mlxsw_thermal_tz_score_update(struct mlxsw_thermal *thermal,
struct thermal_zone_device *tzdev,
struct mlxsw_thermal_trip *trips,
int temp)
{
struct mlxsw_thermal_trip *trip = trips;
unsigned int score, delta, i, shift = 1;
/* Calculate thermal zone score, if temperature is above the critical
* threshold score is set to MLXSW_THERMAL_TEMP_SCORE_MAX.
*/
score = MLXSW_THERMAL_TEMP_SCORE_MAX;
for (i = MLXSW_THERMAL_TEMP_TRIP_NORM; i < MLXSW_THERMAL_NUM_TRIPS;
i++, trip++) {
if (temp < trip->temp) {
delta = DIV_ROUND_CLOSEST(temp, trip->temp - temp);
score = delta * shift;
break;
}
shift *= 256;
}
if (score > thermal->tz_highest_score) {
thermal->tz_highest_score = score;
thermal->tz_highest_dev = tzdev;
}
}
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 = thermal->polling_delay;
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];
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);
if (temp > 0)
mlxsw_thermal_tz_score_update(thermal, tzdev, thermal->trips,
temp);
*p_temp = 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_ASIC_TEMP_CRIT)
return -EINVAL;
thermal->trips[trip].temp = temp;
return 0;
}
static int mlxsw_thermal_get_trip_hyst(struct thermal_zone_device *tzdev,
int trip, int *p_hyst)
{
struct mlxsw_thermal *thermal = tzdev->devdata;
*p_hyst = thermal->trips[trip].hyst;
return 0;
}
static int mlxsw_thermal_set_trip_hyst(struct thermal_zone_device *tzdev,
int trip, int hyst)
{
struct mlxsw_thermal *thermal = tzdev->devdata;
thermal->trips[trip].hyst = hyst;
return 0;
}
static int mlxsw_thermal_trend_get(struct thermal_zone_device *tzdev,
int trip, enum thermal_trend *trend)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
struct mlxsw_thermal *thermal = tz->parent;
if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
return -EINVAL;
if (tzdev == thermal->tz_highest_dev)
return 1;
*trend = THERMAL_TREND_STABLE;
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,
.get_trip_hyst = mlxsw_thermal_get_trip_hyst,
.set_trip_hyst = mlxsw_thermal_set_trip_hyst,
.get_trend = mlxsw_thermal_trend_get,
};
static int mlxsw_thermal_module_bind(struct thermal_zone_device *tzdev,
struct thermal_cooling_device *cdev)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
struct mlxsw_thermal *thermal = tz->parent;
int i, j, 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 = &tz->trips[i];
err = thermal_zone_bind_cooling_device(tzdev, i, cdev,
trip->max_state,
trip->min_state,
THERMAL_WEIGHT_DEFAULT);
if (err < 0)
goto err_bind_cooling_device;
}
return 0;
err_bind_cooling_device:
for (j = i - 1; j >= 0; j--)
thermal_zone_unbind_cooling_device(tzdev, j, cdev);
return err;
}
static int mlxsw_thermal_module_unbind(struct thermal_zone_device *tzdev,
struct thermal_cooling_device *cdev)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
struct mlxsw_thermal *thermal = tz->parent;
int i;
int err;
/* If the cooling device is one of ours 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);
WARN_ON(err);
}
return err;
}
static int mlxsw_thermal_module_mode_get(struct thermal_zone_device *tzdev,
enum thermal_device_mode *mode)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
*mode = tz->mode;
return 0;
}
static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
enum thermal_device_mode mode)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
struct mlxsw_thermal *thermal = tz->parent;
mutex_lock(&tzdev->lock);
if (mode == THERMAL_DEVICE_ENABLED)
tzdev->polling_delay = thermal->polling_delay;
else
tzdev->polling_delay = 0;
mutex_unlock(&tzdev->lock);
tz->mode = mode;
thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
return 0;
}
static int mlxsw_thermal_module_temp_get(struct thermal_zone_device *tzdev,
int *p_temp)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
struct mlxsw_thermal *thermal = tz->parent;
struct device *dev = thermal->bus_info->dev;
char mtmp_pl[MLXSW_REG_MTMP_LEN];
int temp;
int err;
/* Read module temperature. */
mlxsw_reg_mtmp_pack(mtmp_pl, MLXSW_REG_MTMP_MODULE_INDEX_MIN +
tz->module, false, false);
err = mlxsw_reg_query(thermal->core, MLXSW_REG(mtmp), mtmp_pl);
if (err) {
/* Do not return error - in case of broken module's sensor
* it will cause error message flooding.
*/
temp = 0;
*p_temp = (int) temp;
return 0;
}
mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL);
*p_temp = temp;
if (!temp)
return 0;
/* Update trip points. */
err = mlxsw_thermal_module_trips_update(dev, thermal->core, tz);
if (!err && temp > 0)
mlxsw_thermal_tz_score_update(thermal, tzdev, tz->trips, temp);
return 0;
}
static int
mlxsw_thermal_module_trip_type_get(struct thermal_zone_device *tzdev, int trip,
enum thermal_trip_type *p_type)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
return -EINVAL;
*p_type = tz->trips[trip].type;
return 0;
}
static int
mlxsw_thermal_module_trip_temp_get(struct thermal_zone_device *tzdev,
int trip, int *p_temp)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
return -EINVAL;
*p_temp = tz->trips[trip].temp;
return 0;
}
static int
mlxsw_thermal_module_trip_temp_set(struct thermal_zone_device *tzdev,
int trip, int temp)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS ||
temp > tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp)
return -EINVAL;
tz->trips[trip].temp = temp;
return 0;
}
static int
mlxsw_thermal_module_trip_hyst_get(struct thermal_zone_device *tzdev, int trip,
int *p_hyst)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
*p_hyst = tz->trips[trip].hyst;
return 0;
}
static int
mlxsw_thermal_module_trip_hyst_set(struct thermal_zone_device *tzdev, int trip,
int hyst)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
tz->trips[trip].hyst = hyst;
return 0;
}
static struct thermal_zone_device_ops mlxsw_thermal_module_ops = {
.bind = mlxsw_thermal_module_bind,
.unbind = mlxsw_thermal_module_unbind,
.get_mode = mlxsw_thermal_module_mode_get,
.set_mode = mlxsw_thermal_module_mode_set,
.get_temp = mlxsw_thermal_module_temp_get,
.get_trip_type = mlxsw_thermal_module_trip_type_get,
.get_trip_temp = mlxsw_thermal_module_trip_temp_get,
.set_trip_temp = mlxsw_thermal_module_trip_temp_set,
.get_trip_hyst = mlxsw_thermal_module_trip_hyst_get,
.set_trip_hyst = mlxsw_thermal_module_trip_hyst_set,
.get_trend = mlxsw_thermal_trend_get,
};
static int mlxsw_thermal_gearbox_temp_get(struct thermal_zone_device *tzdev,
int *p_temp)
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
struct mlxsw_thermal *thermal = tz->parent;
char mtmp_pl[MLXSW_REG_MTMP_LEN];
u16 index;
int temp;
int err;
index = MLXSW_REG_MTMP_GBOX_INDEX_MIN + tz->module;
mlxsw_reg_mtmp_pack(mtmp_pl, index, false, false);
err = mlxsw_reg_query(thermal->core, MLXSW_REG(mtmp), mtmp_pl);
if (err)
return err;
mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL);
if (temp > 0)
mlxsw_thermal_tz_score_update(thermal, tzdev, tz->trips, temp);
*p_temp = temp;
return 0;
}
static struct thermal_zone_device_ops mlxsw_thermal_gearbox_ops = {
.bind = mlxsw_thermal_module_bind,
.unbind = mlxsw_thermal_module_unbind,
.get_mode = mlxsw_thermal_module_mode_get,
.set_mode = mlxsw_thermal_module_mode_set,
.get_temp = mlxsw_thermal_gearbox_temp_get,
.get_trip_type = mlxsw_thermal_module_trip_type_get,
.get_trip_temp = mlxsw_thermal_module_trip_temp_get,
.set_trip_temp = mlxsw_thermal_module_trip_temp_set,
.get_trip_hyst = mlxsw_thermal_module_trip_hyst_get,
.set_trip_hyst = mlxsw_thermal_module_trip_hyst_set,
.get_trend = mlxsw_thermal_trend_get,
};
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];
unsigned long cur_state, i;
int idx;
u8 duty;
int err;
idx = mlxsw_get_cooling_device_idx(thermal, cdev);
if (idx < 0)
return idx;
/* Verify if this request is for changing allowed fan dynamical
* minimum. If it is - update cooling levels accordingly and update
* state, if current state is below the newly requested minimum state.
* For example, if current state is 5, and minimal state is to be
* changed from 4 to 6, thermal->cooling_levels[0 to 5] will be changed
* all from 4 to 6. And state 5 (thermal->cooling_levels[4]) should be
* overwritten.
*/
if (state >= MLXSW_THERMAL_SPEED_MIN &&
state <= MLXSW_THERMAL_SPEED_MAX) {
state -= MLXSW_THERMAL_MAX_STATE;
for (i = 0; i <= MLXSW_THERMAL_MAX_STATE; i++)
thermal->cooling_levels[i] = max(state, i);
mlxsw_reg_mfsc_pack(mfsc_pl, idx, 0);
err = mlxsw_reg_query(thermal->core, MLXSW_REG(mfsc), mfsc_pl);
if (err)
return err;
duty = mlxsw_reg_mfsc_pwm_duty_cycle_get(mfsc_pl);
cur_state = mlxsw_duty_to_state(duty);
/* If current fan state is lower than requested dynamical
* minimum, increase fan speed up to dynamical minimum.
*/
if (state < cur_state)
return 0;
state = cur_state;
}
if (state > MLXSW_THERMAL_MAX_STATE)
return -EINVAL;
/* Normalize the state to the valid speed range. */
state = thermal->cooling_levels[state];
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,
};
static int
mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
{
char tz_name[MLXSW_THERMAL_ZONE_MAX_NAME];
int err;
snprintf(tz_name, sizeof(tz_name), "mlxsw-module%d",
module_tz->module + 1);
module_tz->tzdev = thermal_zone_device_register(tz_name,
MLXSW_THERMAL_NUM_TRIPS,
MLXSW_THERMAL_TRIP_MASK,
module_tz,
&mlxsw_thermal_module_ops,
NULL, 0, 0);
if (IS_ERR(module_tz->tzdev)) {
err = PTR_ERR(module_tz->tzdev);
return err;
}
module_tz->mode = THERMAL_DEVICE_ENABLED;
return 0;
}
static void mlxsw_thermal_module_tz_fini(struct thermal_zone_device *tzdev)
{
thermal_zone_device_unregister(tzdev);
}
static int
mlxsw_thermal_module_init(struct device *dev, struct mlxsw_core *core,
struct mlxsw_thermal *thermal, u8 local_port)
{
struct mlxsw_thermal_module *module_tz;
char pmlp_pl[MLXSW_REG_PMLP_LEN];
u8 width, module;
int err;
mlxsw_reg_pmlp_pack(pmlp_pl, local_port);
err = mlxsw_reg_query(core, MLXSW_REG(pmlp), pmlp_pl);
if (err)
return err;
width = mlxsw_reg_pmlp_width_get(pmlp_pl);
if (!width)
return 0;
module = mlxsw_reg_pmlp_module_get(pmlp_pl, 0);
module_tz = &thermal->tz_module_arr[module];
/* Skip if parent is already set (case of port split). */
if (module_tz->parent)
return 0;
module_tz->module = module;
module_tz->parent = thermal;
memcpy(module_tz->trips, default_thermal_trips,
sizeof(thermal->trips));
/* Initialize all trip point. */
mlxsw_thermal_module_trips_reset(module_tz);
/* Update trip point according to the module data. */
return mlxsw_thermal_module_trips_update(dev, core, module_tz);
}
static void mlxsw_thermal_module_fini(struct mlxsw_thermal_module *module_tz)
{
if (module_tz && module_tz->tzdev) {
mlxsw_thermal_module_tz_fini(module_tz->tzdev);
module_tz->tzdev = NULL;
module_tz->parent = NULL;
}
}
static int
mlxsw_thermal_modules_init(struct device *dev, struct mlxsw_core *core,
struct mlxsw_thermal *thermal)
{
unsigned int module_count = mlxsw_core_max_ports(core);
struct mlxsw_thermal_module *module_tz;
int i, err;
if (!mlxsw_core_res_query_enabled(core))
return 0;
thermal->tz_module_arr = kcalloc(module_count,
sizeof(*thermal->tz_module_arr),
GFP_KERNEL);
if (!thermal->tz_module_arr)
return -ENOMEM;
for (i = 1; i < module_count; i++) {
err = mlxsw_thermal_module_init(dev, core, thermal, i);
if (err)
goto err_unreg_tz_module_arr;
}
for (i = 0; i < module_count - 1; i++) {
module_tz = &thermal->tz_module_arr[i];
if (!module_tz->parent)
continue;
err = mlxsw_thermal_module_tz_init(module_tz);
if (err)
goto err_unreg_tz_module_arr;
}
return 0;
err_unreg_tz_module_arr:
for (i = module_count - 1; i >= 0; i--)
mlxsw_thermal_module_fini(&thermal->tz_module_arr[i]);
kfree(thermal->tz_module_arr);
return err;
}
static void
mlxsw_thermal_modules_fini(struct mlxsw_thermal *thermal)
{
unsigned int module_count = mlxsw_core_max_ports(thermal->core);
int i;
if (!mlxsw_core_res_query_enabled(thermal->core))
return;
for (i = module_count - 1; i >= 0; i--)
mlxsw_thermal_module_fini(&thermal->tz_module_arr[i]);
kfree(thermal->tz_module_arr);
}
static int
mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
{
char tz_name[MLXSW_THERMAL_ZONE_MAX_NAME];
snprintf(tz_name, sizeof(tz_name), "mlxsw-gearbox%d",
gearbox_tz->module + 1);
gearbox_tz->tzdev = thermal_zone_device_register(tz_name,
MLXSW_THERMAL_NUM_TRIPS,
MLXSW_THERMAL_TRIP_MASK,
gearbox_tz,
&mlxsw_thermal_gearbox_ops,
NULL, 0, 0);
if (IS_ERR(gearbox_tz->tzdev))
return PTR_ERR(gearbox_tz->tzdev);
gearbox_tz->mode = THERMAL_DEVICE_ENABLED;
return 0;
}
static void
mlxsw_thermal_gearbox_tz_fini(struct mlxsw_thermal_module *gearbox_tz)
{
thermal_zone_device_unregister(gearbox_tz->tzdev);
}
static int
mlxsw_thermal_gearboxes_init(struct device *dev, struct mlxsw_core *core,
struct mlxsw_thermal *thermal)
{
struct mlxsw_thermal_module *gearbox_tz;
char mgpir_pl[MLXSW_REG_MGPIR_LEN];
int i;
int err;
if (!mlxsw_core_res_query_enabled(core))
return 0;
mlxsw_reg_mgpir_pack(mgpir_pl);
err = mlxsw_reg_query(core, MLXSW_REG(mgpir), mgpir_pl);
if (err)
return err;
mlxsw_reg_mgpir_unpack(mgpir_pl, &thermal->tz_gearbox_num, NULL, NULL);
if (!thermal->tz_gearbox_num)
return 0;
thermal->tz_gearbox_arr = kcalloc(thermal->tz_gearbox_num,
sizeof(*thermal->tz_gearbox_arr),
GFP_KERNEL);
if (!thermal->tz_gearbox_arr)
return -ENOMEM;
for (i = 0; i < thermal->tz_gearbox_num; i++) {
gearbox_tz = &thermal->tz_gearbox_arr[i];
memcpy(gearbox_tz->trips, default_thermal_trips,
sizeof(thermal->trips));
gearbox_tz->module = i;
gearbox_tz->parent = thermal;
err = mlxsw_thermal_gearbox_tz_init(gearbox_tz);
if (err)
goto err_unreg_tz_gearbox;
}
return 0;
err_unreg_tz_gearbox:
for (i--; i >= 0; i--)
mlxsw_thermal_gearbox_tz_fini(&thermal->tz_gearbox_arr[i]);
kfree(thermal->tz_gearbox_arr);
return err;
}
static void
mlxsw_thermal_gearboxes_fini(struct mlxsw_thermal *thermal)
{
int i;
if (!mlxsw_core_res_query_enabled(thermal->core))
return;
for (i = thermal->tz_gearbox_num - 1; i >= 0; i--)
mlxsw_thermal_gearbox_tz_fini(&thermal->tz_gearbox_arr[i]);
kfree(thermal->tz_gearbox_arr);
}
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("mlxsw_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;
}
}
/* Initialize cooling levels per PWM state. */
for (i = 0; i < MLXSW_THERMAL_MAX_STATE; i++)
thermal->cooling_levels[i] = max(MLXSW_THERMAL_SPEED_MIN_LEVEL,
i);
thermal->polling_delay = bus_info->low_frequency ?
MLXSW_THERMAL_SLOW_POLL_INT :
MLXSW_THERMAL_POLL_INT;
thermal->tzdev = thermal_zone_device_register("mlxsw",
MLXSW_THERMAL_NUM_TRIPS,
MLXSW_THERMAL_TRIP_MASK,
thermal,
&mlxsw_thermal_ops,
NULL, 0,
thermal->polling_delay);
if (IS_ERR(thermal->tzdev)) {
err = PTR_ERR(thermal->tzdev);
dev_err(dev, "Failed to register thermal zone\n");
goto err_unreg_cdevs;
}
err = mlxsw_thermal_modules_init(dev, core, thermal);
if (err)
goto err_unreg_tzdev;
err = mlxsw_thermal_gearboxes_init(dev, core, thermal);
if (err)
goto err_unreg_modules_tzdev;
thermal->mode = THERMAL_DEVICE_ENABLED;
*p_thermal = thermal;
return 0;
err_unreg_modules_tzdev:
mlxsw_thermal_modules_fini(thermal);
err_unreg_tzdev:
if (thermal->tzdev) {
thermal_zone_device_unregister(thermal->tzdev);
thermal->tzdev = NULL;
}
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;
mlxsw_thermal_gearboxes_fini(thermal);
mlxsw_thermal_modules_fini(thermal);
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);
}
