615 lines
15 KiB
C
615 lines
15 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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//
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// Copyright (c) 2018 Mellanox Technologies. All rights reserved.
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// Copyright (c) 2018 Vadim Pasternak <vadimp@mellanox.com>
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/hwmon.h>
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#include <linux/module.h>
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#include <linux/platform_data/mlxreg.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/thermal.h>
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#define MLXREG_FAN_MAX_TACHO 14
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#define MLXREG_FAN_MAX_PWM 4
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#define MLXREG_FAN_PWM_NOT_CONNECTED 0xff
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#define MLXREG_FAN_MAX_STATE 10
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#define MLXREG_FAN_MIN_DUTY 51 /* 20% */
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#define MLXREG_FAN_MAX_DUTY 255 /* 100% */
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#define MLXREG_FAN_SPEED_MIN_LEVEL 2 /* 20 percent */
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#define MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF 44
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#define MLXREG_FAN_TACHO_DIV_MIN 283
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#define MLXREG_FAN_TACHO_DIV_DEF (MLXREG_FAN_TACHO_DIV_MIN * 4)
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#define MLXREG_FAN_TACHO_DIV_SCALE_MAX 64
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/*
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* FAN datasheet defines the formula for RPM calculations as RPM = 15/t-high.
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* The logic in a programmable device measures the time t-high by sampling the
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* tachometer every t-sample (with the default value 11.32 uS) and increment
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* a counter (N) as long as the pulse has not change:
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* RPM = 15 / (t-sample * (K + Regval)), where:
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* Regval: is the value read from the programmable device register;
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* - 0xff - represents tachometer fault;
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* - 0xfe - represents tachometer minimum value , which is 4444 RPM;
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* - 0x00 - represents tachometer maximum value , which is 300000 RPM;
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* K: is 44 and it represents the minimum allowed samples per pulse;
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* N: is equal K + Regval;
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* In order to calculate RPM from the register value the following formula is
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* used: RPM = 15 / ((Regval + K) * 11.32) * 10^(-6)), which in the
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* default case is modified to:
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* RPM = 15000000 * 100 / ((Regval + 44) * 1132);
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* - for Regval 0x00, RPM will be 15000000 * 100 / (44 * 1132) = 30115;
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* - for Regval 0xfe, RPM will be 15000000 * 100 / ((254 + 44) * 1132) = 4446;
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* In common case the formula is modified to:
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* RPM = 15000000 * 100 / ((Regval + samples) * divider).
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*/
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#define MLXREG_FAN_GET_RPM(rval, d, s) (DIV_ROUND_CLOSEST(15000000 * 100, \
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((rval) + (s)) * (d)))
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#define MLXREG_FAN_GET_FAULT(val, mask) ((val) == (mask))
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#define MLXREG_FAN_PWM_DUTY2STATE(duty) (DIV_ROUND_CLOSEST((duty) * \
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MLXREG_FAN_MAX_STATE, \
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MLXREG_FAN_MAX_DUTY))
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#define MLXREG_FAN_PWM_STATE2DUTY(stat) (DIV_ROUND_CLOSEST((stat) * \
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MLXREG_FAN_MAX_DUTY, \
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MLXREG_FAN_MAX_STATE))
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struct mlxreg_fan;
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/*
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* struct mlxreg_fan_tacho - tachometer data (internal use):
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*
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* @connected: indicates if tachometer is connected;
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* @reg: register offset;
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* @mask: fault mask;
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* @prsnt: present register offset;
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*/
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struct mlxreg_fan_tacho {
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bool connected;
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u32 reg;
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u32 mask;
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u32 prsnt;
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};
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/*
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* struct mlxreg_fan_pwm - PWM data (internal use):
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*
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* @fan: private data;
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* @connected: indicates if PWM is connected;
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* @reg: register offset;
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* @cooling: cooling device levels;
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* @last_hwmon_state: last cooling state set by hwmon subsystem;
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* @last_thermal_state: last cooling state set by thermal subsystem;
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* @cdev: cooling device;
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*/
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struct mlxreg_fan_pwm {
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struct mlxreg_fan *fan;
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bool connected;
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u32 reg;
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unsigned long last_hwmon_state;
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unsigned long last_thermal_state;
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struct thermal_cooling_device *cdev;
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};
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/*
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* struct mlxreg_fan - private data (internal use):
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*
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* @dev: basic device;
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* @regmap: register map of parent device;
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* @tacho: tachometer data;
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* @pwm: PWM data;
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* @tachos_per_drwr - number of tachometers per drawer;
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* @samples: minimum allowed samples per pulse;
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* @divider: divider value for tachometer RPM calculation;
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*/
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struct mlxreg_fan {
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struct device *dev;
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void *regmap;
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struct mlxreg_core_platform_data *pdata;
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struct mlxreg_fan_tacho tacho[MLXREG_FAN_MAX_TACHO];
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struct mlxreg_fan_pwm pwm[MLXREG_FAN_MAX_PWM];
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int tachos_per_drwr;
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int samples;
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int divider;
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};
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static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state);
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static int
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mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long *val)
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{
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struct mlxreg_fan *fan = dev_get_drvdata(dev);
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struct mlxreg_fan_tacho *tacho;
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struct mlxreg_fan_pwm *pwm;
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u32 regval;
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int err;
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switch (type) {
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case hwmon_fan:
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tacho = &fan->tacho[channel];
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switch (attr) {
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case hwmon_fan_input:
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/*
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* Check FAN presence: FAN related bit in presence register is one,
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* if FAN is physically connected, zero - otherwise.
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*/
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if (tacho->prsnt && fan->tachos_per_drwr) {
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err = regmap_read(fan->regmap, tacho->prsnt, ®val);
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if (err)
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return err;
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/*
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* Map channel to presence bit - drawer can be equipped with
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* one or few FANs, while presence is indicated per drawer.
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*/
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if (BIT(channel / fan->tachos_per_drwr) & regval) {
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/* FAN is not connected - return zero for FAN speed. */
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*val = 0;
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return 0;
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}
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}
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err = regmap_read(fan->regmap, tacho->reg, ®val);
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if (err)
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return err;
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*val = MLXREG_FAN_GET_RPM(regval, fan->divider,
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fan->samples);
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break;
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case hwmon_fan_fault:
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err = regmap_read(fan->regmap, tacho->reg, ®val);
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if (err)
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return err;
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*val = MLXREG_FAN_GET_FAULT(regval, tacho->mask);
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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case hwmon_pwm:
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pwm = &fan->pwm[channel];
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switch (attr) {
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case hwmon_pwm_input:
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err = regmap_read(fan->regmap, pwm->reg, ®val);
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if (err)
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return err;
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*val = regval;
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int
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mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long val)
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{
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struct mlxreg_fan *fan = dev_get_drvdata(dev);
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struct mlxreg_fan_pwm *pwm;
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switch (type) {
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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if (val < MLXREG_FAN_MIN_DUTY ||
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val > MLXREG_FAN_MAX_DUTY)
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return -EINVAL;
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pwm = &fan->pwm[channel];
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/* If thermal is configured - handle PWM limit setting. */
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if (IS_REACHABLE(CONFIG_THERMAL)) {
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pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(val);
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/*
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* Update PWM only in case requested state is not less than the
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* last thermal state.
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*/
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if (pwm->last_hwmon_state >= pwm->last_thermal_state)
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return mlxreg_fan_set_cur_state(pwm->cdev,
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pwm->last_hwmon_state);
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return 0;
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}
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return regmap_write(fan->regmap, pwm->reg, val);
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return -EOPNOTSUPP;
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}
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static umode_t
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mlxreg_fan_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
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int channel)
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{
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switch (type) {
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case hwmon_fan:
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if (!(((struct mlxreg_fan *)data)->tacho[channel].connected))
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return 0;
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switch (attr) {
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case hwmon_fan_input:
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case hwmon_fan_fault:
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return 0444;
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default:
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break;
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}
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break;
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case hwmon_pwm:
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if (!(((struct mlxreg_fan *)data)->pwm[channel].connected))
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return 0;
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switch (attr) {
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case hwmon_pwm_input:
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return 0644;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static char *mlxreg_fan_name[] = {
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"mlxreg_fan",
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"mlxreg_fan1",
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"mlxreg_fan2",
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"mlxreg_fan3",
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};
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static const struct hwmon_channel_info *mlxreg_fan_hwmon_info[] = {
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HWMON_CHANNEL_INFO(fan,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT),
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HWMON_CHANNEL_INFO(pwm,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT),
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NULL
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};
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static const struct hwmon_ops mlxreg_fan_hwmon_hwmon_ops = {
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.is_visible = mlxreg_fan_is_visible,
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.read = mlxreg_fan_read,
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.write = mlxreg_fan_write,
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};
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static const struct hwmon_chip_info mlxreg_fan_hwmon_chip_info = {
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.ops = &mlxreg_fan_hwmon_hwmon_ops,
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.info = mlxreg_fan_hwmon_info,
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};
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static int mlxreg_fan_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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*state = MLXREG_FAN_MAX_STATE;
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return 0;
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}
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static int mlxreg_fan_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct mlxreg_fan_pwm *pwm = cdev->devdata;
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struct mlxreg_fan *fan = pwm->fan;
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u32 regval;
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int err;
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err = regmap_read(fan->regmap, pwm->reg, ®val);
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if (err) {
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dev_err(fan->dev, "Failed to query PWM duty\n");
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return err;
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}
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*state = MLXREG_FAN_PWM_DUTY2STATE(regval);
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return 0;
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}
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static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct mlxreg_fan_pwm *pwm = cdev->devdata;
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struct mlxreg_fan *fan = pwm->fan;
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int err;
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if (state > MLXREG_FAN_MAX_STATE)
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return -EINVAL;
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/* Save thermal state. */
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pwm->last_thermal_state = state;
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state = max_t(unsigned long, state, pwm->last_hwmon_state);
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err = regmap_write(fan->regmap, pwm->reg,
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MLXREG_FAN_PWM_STATE2DUTY(state));
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if (err) {
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dev_err(fan->dev, "Failed to write PWM duty\n");
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return err;
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}
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return 0;
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}
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static const struct thermal_cooling_device_ops mlxreg_fan_cooling_ops = {
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.get_max_state = mlxreg_fan_get_max_state,
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.get_cur_state = mlxreg_fan_get_cur_state,
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.set_cur_state = mlxreg_fan_set_cur_state,
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};
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static int mlxreg_fan_connect_verify(struct mlxreg_fan *fan,
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struct mlxreg_core_data *data)
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{
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u32 regval;
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int err;
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err = regmap_read(fan->regmap, data->capability, ®val);
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if (err) {
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dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
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data->capability);
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return err;
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}
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return !!(regval & data->bit);
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}
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static int mlxreg_pwm_connect_verify(struct mlxreg_fan *fan,
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struct mlxreg_core_data *data)
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{
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u32 regval;
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int err;
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err = regmap_read(fan->regmap, data->reg, ®val);
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if (err) {
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dev_err(fan->dev, "Failed to query pwm register 0x%08x\n",
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data->reg);
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return err;
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}
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return regval != MLXREG_FAN_PWM_NOT_CONNECTED;
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}
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static int mlxreg_fan_speed_divider_get(struct mlxreg_fan *fan,
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struct mlxreg_core_data *data)
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{
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u32 regval;
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int err;
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err = regmap_read(fan->regmap, data->capability, ®val);
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if (err) {
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dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
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data->capability);
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return err;
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}
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/*
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* Set divider value according to the capability register, in case it
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* contains valid value. Otherwise use default value. The purpose of
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* this validation is to protect against the old hardware, in which
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* this register can return zero.
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*/
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if (regval > 0 && regval <= MLXREG_FAN_TACHO_DIV_SCALE_MAX)
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fan->divider = regval * MLXREG_FAN_TACHO_DIV_MIN;
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return 0;
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}
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static int mlxreg_fan_config(struct mlxreg_fan *fan,
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struct mlxreg_core_platform_data *pdata)
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{
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int tacho_num = 0, tacho_avail = 0, pwm_num = 0, i;
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struct mlxreg_core_data *data = pdata->data;
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bool configured = false;
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int err;
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fan->samples = MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF;
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fan->divider = MLXREG_FAN_TACHO_DIV_DEF;
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for (i = 0; i < pdata->counter; i++, data++) {
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if (strnstr(data->label, "tacho", sizeof(data->label))) {
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if (tacho_num == MLXREG_FAN_MAX_TACHO) {
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dev_err(fan->dev, "too many tacho entries: %s\n",
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data->label);
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return -EINVAL;
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}
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if (data->capability) {
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err = mlxreg_fan_connect_verify(fan, data);
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if (err < 0)
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return err;
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else if (!err) {
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tacho_num++;
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continue;
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}
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}
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fan->tacho[tacho_num].reg = data->reg;
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fan->tacho[tacho_num].mask = data->mask;
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fan->tacho[tacho_num].prsnt = data->reg_prsnt;
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fan->tacho[tacho_num++].connected = true;
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tacho_avail++;
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} else if (strnstr(data->label, "pwm", sizeof(data->label))) {
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if (pwm_num == MLXREG_FAN_MAX_TACHO) {
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dev_err(fan->dev, "too many pwm entries: %s\n",
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data->label);
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return -EINVAL;
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}
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/* Validate if more then one PWM is connected. */
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if (pwm_num) {
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err = mlxreg_pwm_connect_verify(fan, data);
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if (err < 0)
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return err;
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else if (!err)
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continue;
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}
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fan->pwm[pwm_num].reg = data->reg;
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fan->pwm[pwm_num].connected = true;
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pwm_num++;
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} else if (strnstr(data->label, "conf", sizeof(data->label))) {
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if (configured) {
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dev_err(fan->dev, "duplicate conf entry: %s\n",
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data->label);
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return -EINVAL;
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}
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/* Validate that conf parameters are not zeros. */
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if (!data->mask && !data->bit && !data->capability) {
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dev_err(fan->dev, "invalid conf entry params: %s\n",
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data->label);
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return -EINVAL;
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}
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|
if (data->capability) {
|
|
err = mlxreg_fan_speed_divider_get(fan, data);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
if (data->mask)
|
|
fan->samples = data->mask;
|
|
if (data->bit)
|
|
fan->divider = data->bit;
|
|
}
|
|
configured = true;
|
|
} else {
|
|
dev_err(fan->dev, "invalid label: %s\n", data->label);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (pdata->capability) {
|
|
int drwr_avail;
|
|
u32 regval;
|
|
|
|
/* Obtain the number of FAN drawers, supported by system. */
|
|
err = regmap_read(fan->regmap, pdata->capability, ®val);
|
|
if (err) {
|
|
dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
|
|
pdata->capability);
|
|
return err;
|
|
}
|
|
|
|
drwr_avail = hweight32(regval);
|
|
if (!tacho_avail || !drwr_avail || tacho_avail < drwr_avail) {
|
|
dev_err(fan->dev, "Configuration is invalid: drawers num %d tachos num %d\n",
|
|
drwr_avail, tacho_avail);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Set the number of tachometers per one drawer. */
|
|
fan->tachos_per_drwr = tacho_avail / drwr_avail;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mlxreg_fan_cooling_config(struct device *dev, struct mlxreg_fan *fan)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MLXREG_FAN_MAX_PWM; i++) {
|
|
struct mlxreg_fan_pwm *pwm = &fan->pwm[i];
|
|
|
|
if (!pwm->connected)
|
|
continue;
|
|
pwm->fan = fan;
|
|
pwm->cdev = devm_thermal_of_cooling_device_register(dev, NULL, mlxreg_fan_name[i],
|
|
pwm, &mlxreg_fan_cooling_ops);
|
|
if (IS_ERR(pwm->cdev)) {
|
|
dev_err(dev, "Failed to register cooling device\n");
|
|
return PTR_ERR(pwm->cdev);
|
|
}
|
|
|
|
/* Set minimal PWM speed. */
|
|
pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(MLXREG_FAN_MIN_DUTY);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mlxreg_fan_probe(struct platform_device *pdev)
|
|
{
|
|
struct mlxreg_core_platform_data *pdata;
|
|
struct device *dev = &pdev->dev;
|
|
struct mlxreg_fan *fan;
|
|
struct device *hwm;
|
|
int err;
|
|
|
|
pdata = dev_get_platdata(dev);
|
|
if (!pdata) {
|
|
dev_err(dev, "Failed to get platform data.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
fan = devm_kzalloc(dev, sizeof(*fan), GFP_KERNEL);
|
|
if (!fan)
|
|
return -ENOMEM;
|
|
|
|
fan->dev = dev;
|
|
fan->regmap = pdata->regmap;
|
|
|
|
err = mlxreg_fan_config(fan, pdata);
|
|
if (err)
|
|
return err;
|
|
|
|
hwm = devm_hwmon_device_register_with_info(dev, "mlxreg_fan",
|
|
fan,
|
|
&mlxreg_fan_hwmon_chip_info,
|
|
NULL);
|
|
if (IS_ERR(hwm)) {
|
|
dev_err(dev, "Failed to register hwmon device\n");
|
|
return PTR_ERR(hwm);
|
|
}
|
|
|
|
if (IS_REACHABLE(CONFIG_THERMAL))
|
|
err = mlxreg_fan_cooling_config(dev, fan);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct platform_driver mlxreg_fan_driver = {
|
|
.driver = {
|
|
.name = "mlxreg-fan",
|
|
},
|
|
.probe = mlxreg_fan_probe,
|
|
};
|
|
|
|
module_platform_driver(mlxreg_fan_driver);
|
|
|
|
MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
|
|
MODULE_DESCRIPTION("Mellanox FAN driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:mlxreg-fan");
|