drivers/hwmon/bt1-pvt.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
  *
  * Baikal-T1 Process, Voltage, Temperature sensor driver
  */
 #ifndef __HWMON_BT1_PVT_H__
 #define __HWMON_BT1_PVT_H__

 #include <linux/completion.h>
 #include <linux/hwmon.h>
 #include <linux/kernel.h>
 #include <linux/ktime.h>
 #include <linux/mutex.h>
 #include <linux/seqlock.h>

 /* Baikal-T1 PVT registers and their bitfields */
 #define PVT_CTRL			0x00
 #define PVT_CTRL_EN			BIT(0)
 #define PVT_CTRL_MODE_FLD		1
 #define PVT_CTRL_MODE_MASK		GENMASK(3, PVT_CTRL_MODE_FLD)
 #define PVT_CTRL_MODE_TEMP		0x0
 #define PVT_CTRL_MODE_VOLT		0x1
 #define PVT_CTRL_MODE_LVT		0x2
 #define PVT_CTRL_MODE_HVT		0x4
 #define PVT_CTRL_MODE_SVT		0x6
 #define PVT_CTRL_TRIM_FLD		4
 #define PVT_CTRL_TRIM_MASK		GENMASK(8, PVT_CTRL_TRIM_FLD)
 #define PVT_DATA			0x04
 #define PVT_DATA_VALID			BIT(10)
 #define PVT_DATA_DATA_FLD		0
 #define PVT_DATA_DATA_MASK		GENMASK(9, PVT_DATA_DATA_FLD)
 #define PVT_TTHRES			0x08
 #define PVT_VTHRES			0x0C
 #define PVT_LTHRES			0x10
 #define PVT_HTHRES			0x14
 #define PVT_STHRES			0x18
 #define PVT_THRES_LO_FLD		0
 #define PVT_THRES_LO_MASK		GENMASK(9, PVT_THRES_LO_FLD)
 #define PVT_THRES_HI_FLD		10
 #define PVT_THRES_HI_MASK		GENMASK(19, PVT_THRES_HI_FLD)
 #define PVT_TTIMEOUT			0x1C
 #define PVT_INTR_STAT			0x20
 #define PVT_INTR_MASK			0x24
 #define PVT_RAW_INTR_STAT		0x28
 #define PVT_INTR_DVALID			BIT(0)
 #define PVT_INTR_TTHRES_LO		BIT(1)
 #define PVT_INTR_TTHRES_HI		BIT(2)
 #define PVT_INTR_VTHRES_LO		BIT(3)
 #define PVT_INTR_VTHRES_HI		BIT(4)
 #define PVT_INTR_LTHRES_LO		BIT(5)
 #define PVT_INTR_LTHRES_HI		BIT(6)
 #define PVT_INTR_HTHRES_LO		BIT(7)
 #define PVT_INTR_HTHRES_HI		BIT(8)
 #define PVT_INTR_STHRES_LO		BIT(9)
 #define PVT_INTR_STHRES_HI		BIT(10)
 #define PVT_INTR_ALL			GENMASK(10, 0)
 #define PVT_CLR_INTR			0x2C

 /*
  * PVT sensors-related limits and default values
  * @PVT_TEMP_MIN: Minimal temperature in millidegrees of Celsius.
  * @PVT_TEMP_MAX: Maximal temperature in millidegrees of Celsius.
  * @PVT_TEMP_CHS: Number of temperature hwmon channels.
  * @PVT_VOLT_MIN: Minimal voltage in mV.
  * @PVT_VOLT_MAX: Maximal voltage in mV.
  * @PVT_VOLT_CHS: Number of voltage hwmon channels.
  * @PVT_DATA_MIN: Minimal PVT raw data value.
  * @PVT_DATA_MAX: Maximal PVT raw data value.
  * @PVT_TRIM_MIN: Minimal temperature sensor trim value.
  * @PVT_TRIM_MAX: Maximal temperature sensor trim value.
  * @PVT_TRIM_DEF: Default temperature sensor trim value (set a proper value
  *		  when one is determined for Baikal-T1 SoC).
  * @PVT_TRIM_TEMP: Maximum temperature encoded by the trim factor.
  * @PVT_TRIM_STEP: Temperature stride corresponding to the trim value.
  * @PVT_TOUT_MIN: Minimal timeout between samples in nanoseconds.
  * @PVT_TOUT_DEF: Default data measurements timeout. In case if alarms are
  *		  activated the PVT IRQ is enabled to be raised after each
  *		  conversion in order to have the thresholds checked and the
  *		  converted value cached. Too frequent conversions may cause
  *		  the system CPU overload. Lets set the 50ms delay between
  *		  them by default to prevent this.
  */
 #define PVT_TEMP_MIN		-48380L
 #define PVT_TEMP_MAX		147438L
 #define PVT_TEMP_CHS		1
 #define PVT_VOLT_MIN		620L
 #define PVT_VOLT_MAX		1168L
 #define PVT_VOLT_CHS		4
 #define PVT_DATA_MIN		0
 #define PVT_DATA_MAX		(PVT_DATA_DATA_MASK >> PVT_DATA_DATA_FLD)
 #define PVT_TRIM_MIN		0
 #define PVT_TRIM_MAX		(PVT_CTRL_TRIM_MASK >> PVT_CTRL_TRIM_FLD)
 #define PVT_TRIM_TEMP		7130
 #define PVT_TRIM_STEP		(PVT_TRIM_TEMP / PVT_TRIM_MAX)
 #define PVT_TRIM_DEF		0
 #define PVT_TOUT_MIN		(NSEC_PER_SEC / 3000)
 #if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
 # define PVT_TOUT_DEF		60000
 #else
 # define PVT_TOUT_DEF		0
 #endif

 /*
  * enum pvt_sensor_type - Baikal-T1 PVT sensor types (correspond to each PVT
  *			  sampling mode)
  * @PVT_SENSOR*: helpers to traverse the sensors in loops.
  * @PVT_TEMP: PVT Temperature sensor.
  * @PVT_VOLT: PVT Voltage sensor.
  * @PVT_LVT: PVT Low-Voltage threshold sensor.
  * @PVT_HVT: PVT High-Voltage threshold sensor.
  * @PVT_SVT: PVT Standard-Voltage threshold sensor.
  */
 enum pvt_sensor_type {
 	PVT_SENSOR_FIRST,
 	PVT_TEMP = PVT_SENSOR_FIRST,
 	PVT_VOLT,
 	PVT_LVT,
 	PVT_HVT,
 	PVT_SVT,
 	PVT_SENSOR_LAST = PVT_SVT,
 	PVT_SENSORS_NUM
 };

 /*
  * enum pvt_clock_type - Baikal-T1 PVT clocks.
  * @PVT_CLOCK_APB: APB clock.
  * @PVT_CLOCK_REF: PVT reference clock.
  */
 enum pvt_clock_type {
 	PVT_CLOCK_APB,
 	PVT_CLOCK_REF,
 	PVT_CLOCK_NUM
 };

 /*
  * struct pvt_sensor_info - Baikal-T1 PVT sensor informational structure
  * @channel: Sensor channel ID.
  * @label: hwmon sensor label.
  * @mode: PVT mode corresponding to the channel.
  * @thres_base: upper and lower threshold values of the sensor.
  * @thres_sts_lo: low threshold status bitfield.
  * @thres_sts_hi: high threshold status bitfield.
  * @type: Sensor type.
  * @attr_min_alarm: Min alarm attribute ID.
  * @attr_min_alarm: Max alarm attribute ID.
  */
 struct pvt_sensor_info {
 	int channel;
 	const char *label;
 	u32 mode;
 	unsigned long thres_base;
 	u32 thres_sts_lo;
 	u32 thres_sts_hi;
 	enum hwmon_sensor_types type;
 	u32 attr_min_alarm;
 	u32 attr_max_alarm;
 };

 #define PVT_SENSOR_INFO(_ch, _label, _type, _mode, _thres)	\
 	{							\
 		.channel = _ch,					\
 		.label = _label,				\
 		.mode = PVT_CTRL_MODE_ ##_mode,			\
 		.thres_base = PVT_ ##_thres,			\
 		.thres_sts_lo = PVT_INTR_ ##_thres## _LO,	\
 		.thres_sts_hi = PVT_INTR_ ##_thres## _HI,	\
 		.type = _type,					\
 		.attr_min_alarm = _type## _min,			\
 		.attr_max_alarm = _type## _max,			\
 	}

 /*
  * struct pvt_cache - PVT sensors data cache
  * @data: data cache in raw format.
  * @thres_sts_lo: low threshold status saved on the previous data conversion.
  * @thres_sts_hi: high threshold status saved on the previous data conversion.
  * @data_seqlock: cached data seq-lock.
  * @conversion: data conversion completion.
  */
 struct pvt_cache {
 	u32 data;
 #if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
 	seqlock_t data_seqlock;
 	u32 thres_sts_lo;
 	u32 thres_sts_hi;
 #else
 	struct completion conversion;
 #endif
 };

 /*
  * struct pvt_hwmon - Baikal-T1 PVT private data
  * @dev: device structure of the PVT platform device.
  * @hwmon: hwmon device structure.
  * @regs: pointer to the Baikal-T1 PVT registers region.
  * @irq: PVT events IRQ number.
  * @clks: Array of the PVT clocks descriptor (APB/ref clocks).
  * @ref_clk: Pointer to the reference clocks descriptor.
  * @iface_mtx: Generic interface mutex (used to lock the alarm registers
  *	       when the alarms enabled, or the data conversion interface
  *	       if alarms are disabled).
  * @sensor: current PVT sensor the data conversion is being performed for.
  * @cache: data cache descriptor.
  * @timeout: conversion timeout cache.
  */
 struct pvt_hwmon {
 	struct device *dev;
 	struct device *hwmon;

 	void __iomem *regs;
 	int irq;

 	struct clk_bulk_data clks[PVT_CLOCK_NUM];

 	struct mutex iface_mtx;
 	enum pvt_sensor_type sensor;
 	struct pvt_cache cache[PVT_SENSORS_NUM];
 	ktime_t timeout;
 };

 /*
  * struct pvt_poly_term - a term descriptor of the PVT data translation
  *			  polynomial
  * @deg: degree of the term.
  * @coef: multiplication factor of the term.
  * @divider: distributed divider per each degree.
  * @divider_leftover: divider leftover, which couldn't be redistributed.
  */
 struct pvt_poly_term {
 	unsigned int deg;
 	long coef;
 	long divider;
 	long divider_leftover;
 };

 /*
  * struct pvt_poly - PVT data translation polynomial descriptor
  * @total_divider: total data divider.
  * @terms: polynomial terms up to a free one.
  */
 struct pvt_poly {
 	long total_divider;
 	struct pvt_poly_term terms[];
 };

 #endif /* __HWMON_BT1_PVT_H__ */
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
	*
	* Baikal-T1 Process, Voltage, Temperature sensor driver
	*/
	#ifndef __HWMON_BT1_PVT_H__
	#define __HWMON_BT1_PVT_H__

	#include <linux/completion.h>
	#include <linux/hwmon.h>
	#include <linux/kernel.h>
	#include <linux/ktime.h>
	#include <linux/mutex.h>
	#include <linux/seqlock.h>

	/* Baikal-T1 PVT registers and their bitfields */
	#define PVT_CTRL 0x00
	#define PVT_CTRL_EN BIT(0)
	#define PVT_CTRL_MODE_FLD 1
	#define PVT_CTRL_MODE_MASK GENMASK(3, PVT_CTRL_MODE_FLD)
	#define PVT_CTRL_MODE_TEMP 0x0
	#define PVT_CTRL_MODE_VOLT 0x1
	#define PVT_CTRL_MODE_LVT 0x2
	#define PVT_CTRL_MODE_HVT 0x4
	#define PVT_CTRL_MODE_SVT 0x6
	#define PVT_CTRL_TRIM_FLD 4
	#define PVT_CTRL_TRIM_MASK GENMASK(8, PVT_CTRL_TRIM_FLD)
	#define PVT_DATA 0x04
	#define PVT_DATA_VALID BIT(10)
	#define PVT_DATA_DATA_FLD 0
	#define PVT_DATA_DATA_MASK GENMASK(9, PVT_DATA_DATA_FLD)
	#define PVT_TTHRES 0x08
	#define PVT_VTHRES 0x0C
	#define PVT_LTHRES 0x10
	#define PVT_HTHRES 0x14
	#define PVT_STHRES 0x18
	#define PVT_THRES_LO_FLD 0
	#define PVT_THRES_LO_MASK GENMASK(9, PVT_THRES_LO_FLD)
	#define PVT_THRES_HI_FLD 10
	#define PVT_THRES_HI_MASK GENMASK(19, PVT_THRES_HI_FLD)
	#define PVT_TTIMEOUT 0x1C
	#define PVT_INTR_STAT 0x20
	#define PVT_INTR_MASK 0x24
	#define PVT_RAW_INTR_STAT 0x28
	#define PVT_INTR_DVALID BIT(0)
	#define PVT_INTR_TTHRES_LO BIT(1)
	#define PVT_INTR_TTHRES_HI BIT(2)
	#define PVT_INTR_VTHRES_LO BIT(3)
	#define PVT_INTR_VTHRES_HI BIT(4)
	#define PVT_INTR_LTHRES_LO BIT(5)
	#define PVT_INTR_LTHRES_HI BIT(6)
	#define PVT_INTR_HTHRES_LO BIT(7)
	#define PVT_INTR_HTHRES_HI BIT(8)
	#define PVT_INTR_STHRES_LO BIT(9)
	#define PVT_INTR_STHRES_HI BIT(10)
	#define PVT_INTR_ALL GENMASK(10, 0)
	#define PVT_CLR_INTR 0x2C

	/*
	* PVT sensors-related limits and default values
	* @PVT_TEMP_MIN: Minimal temperature in millidegrees of Celsius.
	* @PVT_TEMP_MAX: Maximal temperature in millidegrees of Celsius.
	* @PVT_TEMP_CHS: Number of temperature hwmon channels.
	* @PVT_VOLT_MIN: Minimal voltage in mV.
	* @PVT_VOLT_MAX: Maximal voltage in mV.
	* @PVT_VOLT_CHS: Number of voltage hwmon channels.
	* @PVT_DATA_MIN: Minimal PVT raw data value.
	* @PVT_DATA_MAX: Maximal PVT raw data value.
	* @PVT_TRIM_MIN: Minimal temperature sensor trim value.
	* @PVT_TRIM_MAX: Maximal temperature sensor trim value.
	* @PVT_TRIM_DEF: Default temperature sensor trim value (set a proper value
	* when one is determined for Baikal-T1 SoC).
	* @PVT_TRIM_TEMP: Maximum temperature encoded by the trim factor.
	* @PVT_TRIM_STEP: Temperature stride corresponding to the trim value.
	* @PVT_TOUT_MIN: Minimal timeout between samples in nanoseconds.
	* @PVT_TOUT_DEF: Default data measurements timeout. In case if alarms are
	* activated the PVT IRQ is enabled to be raised after each
	* conversion in order to have the thresholds checked and the
	* converted value cached. Too frequent conversions may cause
	* the system CPU overload. Lets set the 50ms delay between
	* them by default to prevent this.
	*/
	#define PVT_TEMP_MIN -48380L
	#define PVT_TEMP_MAX 147438L
	#define PVT_TEMP_CHS 1
	#define PVT_VOLT_MIN 620L
	#define PVT_VOLT_MAX 1168L
	#define PVT_VOLT_CHS 4
	#define PVT_DATA_MIN 0
	#define PVT_DATA_MAX (PVT_DATA_DATA_MASK >> PVT_DATA_DATA_FLD)
	#define PVT_TRIM_MIN 0
	#define PVT_TRIM_MAX (PVT_CTRL_TRIM_MASK >> PVT_CTRL_TRIM_FLD)
	#define PVT_TRIM_TEMP 7130
	#define PVT_TRIM_STEP (PVT_TRIM_TEMP / PVT_TRIM_MAX)
	#define PVT_TRIM_DEF 0
	#define PVT_TOUT_MIN (NSEC_PER_SEC / 3000)
	#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
	# define PVT_TOUT_DEF 60000
	#else
	# define PVT_TOUT_DEF 0
	#endif

	/*
	* enum pvt_sensor_type - Baikal-T1 PVT sensor types (correspond to each PVT
	* sampling mode)
	* @PVT_SENSOR*: helpers to traverse the sensors in loops.
	* @PVT_TEMP: PVT Temperature sensor.
	* @PVT_VOLT: PVT Voltage sensor.
	* @PVT_LVT: PVT Low-Voltage threshold sensor.
	* @PVT_HVT: PVT High-Voltage threshold sensor.
	* @PVT_SVT: PVT Standard-Voltage threshold sensor.
	*/
	enum pvt_sensor_type {
	PVT_SENSOR_FIRST,
	PVT_TEMP = PVT_SENSOR_FIRST,
	PVT_VOLT,
	PVT_LVT,
	PVT_HVT,
	PVT_SVT,
	PVT_SENSOR_LAST = PVT_SVT,
	PVT_SENSORS_NUM
	};

	/*
	* enum pvt_clock_type - Baikal-T1 PVT clocks.
	* @PVT_CLOCK_APB: APB clock.
	* @PVT_CLOCK_REF: PVT reference clock.
	*/
	enum pvt_clock_type {
	PVT_CLOCK_APB,
	PVT_CLOCK_REF,
	PVT_CLOCK_NUM
	};

	/*
	* struct pvt_sensor_info - Baikal-T1 PVT sensor informational structure
	* @channel: Sensor channel ID.
	* @label: hwmon sensor label.
	* @mode: PVT mode corresponding to the channel.
	* @thres_base: upper and lower threshold values of the sensor.
	* @thres_sts_lo: low threshold status bitfield.
	* @thres_sts_hi: high threshold status bitfield.
	* @type: Sensor type.
	* @attr_min_alarm: Min alarm attribute ID.
	* @attr_min_alarm: Max alarm attribute ID.
	*/
	struct pvt_sensor_info {
	int channel;
	const char *label;
	u32 mode;
	unsigned long thres_base;
	u32 thres_sts_lo;
	u32 thres_sts_hi;
	enum hwmon_sensor_types type;
	u32 attr_min_alarm;
	u32 attr_max_alarm;
	};

	#define PVT_SENSOR_INFO(_ch, _label, _type, _mode, _thres) \
	{ \
	.channel = _ch, \
	.label = _label, \
	.mode = PVT_CTRL_MODE_ ##_mode, \
	.thres_base = PVT_ ##_thres, \
	.thres_sts_lo = PVT_INTR_ ##_thres## _LO, \
	.thres_sts_hi = PVT_INTR_ ##_thres## _HI, \
	.type = _type, \
	.attr_min_alarm = _type## _min, \
	.attr_max_alarm = _type## _max, \
	}

	/*
	* struct pvt_cache - PVT sensors data cache
	* @data: data cache in raw format.
	* @thres_sts_lo: low threshold status saved on the previous data conversion.
	* @thres_sts_hi: high threshold status saved on the previous data conversion.
	* @data_seqlock: cached data seq-lock.
	* @conversion: data conversion completion.
	*/
	struct pvt_cache {
	u32 data;
	#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
	seqlock_t data_seqlock;
	u32 thres_sts_lo;
	u32 thres_sts_hi;
	#else
	struct completion conversion;
	#endif
	};

	/*
	* struct pvt_hwmon - Baikal-T1 PVT private data
	* @dev: device structure of the PVT platform device.
	* @hwmon: hwmon device structure.
	* @regs: pointer to the Baikal-T1 PVT registers region.
	* @irq: PVT events IRQ number.
	* @clks: Array of the PVT clocks descriptor (APB/ref clocks).
	* @ref_clk: Pointer to the reference clocks descriptor.
	* @iface_mtx: Generic interface mutex (used to lock the alarm registers
	* when the alarms enabled, or the data conversion interface
	* if alarms are disabled).
	* @sensor: current PVT sensor the data conversion is being performed for.
	* @cache: data cache descriptor.
	* @timeout: conversion timeout cache.
	*/
	struct pvt_hwmon {
	struct device *dev;
	struct device *hwmon;

	void __iomem *regs;
	int irq;

	struct clk_bulk_data clks[PVT_CLOCK_NUM];

	struct mutex iface_mtx;
	enum pvt_sensor_type sensor;
	struct pvt_cache cache[PVT_SENSORS_NUM];
	ktime_t timeout;
	};

	/*
	* struct pvt_poly_term - a term descriptor of the PVT data translation
	* polynomial
	* @deg: degree of the term.
	* @coef: multiplication factor of the term.
	* @divider: distributed divider per each degree.
	* @divider_leftover: divider leftover, which couldn't be redistributed.
	*/
	struct pvt_poly_term {
	unsigned int deg;
	long coef;
	long divider;
	long divider_leftover;
	};

	/*
	* struct pvt_poly - PVT data translation polynomial descriptor
	* @total_divider: total data divider.
	* @terms: polynomial terms up to a free one.
	*/
	struct pvt_poly {
	long total_divider;
	struct pvt_poly_term terms[];
	};

	#endif /* __HWMON_BT1_PVT_H__ */