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| -rw-r--r-- | drivers/hwmon/bt1-pvt.h | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/hwmon/bt1-pvt.h b/drivers/hwmon/bt1-pvt.h new file mode 100644 index 000000000..93b8dd5e7 --- /dev/null +++ b/drivers/hwmon/bt1-pvt.h @@ -0,0 +1,247 @@ +/* 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__ */ |