+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
- *
- * Authors:
- * Maxim Kaurkin <maxim.kaurkin@baikalelectronics.ru>
- * Serge Semin <Sergey.Semin@baikalelectronics.ru>
- *
- * Baikal-T1 Process, Voltage, Temperature sensor driver
- */
-
-#include <linux/bitfield.h>
-#include <linux/bitops.h>
-#include <linux/clk.h>
-#include <linux/completion.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/hwmon-sysfs.h>
-#include <linux/hwmon.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/ktime.h>
-#include <linux/limits.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/polynomial.h>
-#include <linux/seqlock.h>
-#include <linux/sysfs.h>
-#include <linux/types.h>
-
-#include "bt1-pvt.h"
-
-/*
- * For the sake of the code simplification we created the sensors info table
- * with the sensor names, activation modes, threshold registers base address
- * and the thresholds bit fields.
- */
-static const struct pvt_sensor_info pvt_info[] = {
- PVT_SENSOR_INFO(0, "CPU Core Temperature", hwmon_temp, TEMP, TTHRES),
- PVT_SENSOR_INFO(0, "CPU Core Voltage", hwmon_in, VOLT, VTHRES),
- PVT_SENSOR_INFO(1, "CPU Core Low-Vt", hwmon_in, LVT, LTHRES),
- PVT_SENSOR_INFO(2, "CPU Core High-Vt", hwmon_in, HVT, HTHRES),
- PVT_SENSOR_INFO(3, "CPU Core Standard-Vt", hwmon_in, SVT, STHRES),
-};
-
-/*
- * The original translation formulae of the temperature (in degrees of Celsius)
- * to PVT data and vice-versa are following:
- * N = 1.8322e-8*(T^4) + 2.343e-5*(T^3) + 8.7018e-3*(T^2) + 3.9269*(T^1) +
- * 1.7204e2,
- * T = -1.6743e-11*(N^4) + 8.1542e-8*(N^3) + -1.8201e-4*(N^2) +
- * 3.1020e-1*(N^1) - 4.838e1,
- * where T = [-48.380, 147.438]C and N = [0, 1023].
- * They must be accordingly altered to be suitable for the integer arithmetics.
- * The technique is called 'factor redistribution', which just makes sure the
- * multiplications and divisions are made so to have a result of the operations
- * within the integer numbers limit. In addition we need to translate the
- * formulae to accept millidegrees of Celsius. Here what they look like after
- * the alterations:
- * N = (18322e-20*(T^4) + 2343e-13*(T^3) + 87018e-9*(T^2) + 39269e-3*T +
- * 17204e2) / 1e4,
- * T = -16743e-12*(D^4) + 81542e-9*(D^3) - 182010e-6*(D^2) + 310200e-3*D -
- * 48380,
- * where T = [-48380, 147438] mC and N = [0, 1023].
- */
-static const struct polynomial __maybe_unused poly_temp_to_N = {
- .total_divider = 10000,
- .terms = {
- {4, 18322, 10000, 10000},
- {3, 2343, 10000, 10},
- {2, 87018, 10000, 10},
- {1, 39269, 1000, 1},
- {0, 1720400, 1, 1}
- }
-};
-
-static const struct polynomial poly_N_to_temp = {
- .total_divider = 1,
- .terms = {
- {4, -16743, 1000, 1},
- {3, 81542, 1000, 1},
- {2, -182010, 1000, 1},
- {1, 310200, 1000, 1},
- {0, -48380, 1, 1}
- }
-};
-
-/*
- * Similar alterations are performed for the voltage conversion equations.
- * The original formulae are:
- * N = 1.8658e3*V - 1.1572e3,
- * V = (N + 1.1572e3) / 1.8658e3,
- * where V = [0.620, 1.168] V and N = [0, 1023].
- * After the optimization they looks as follows:
- * N = (18658e-3*V - 11572) / 10,
- * V = N * 10^5 / 18658 + 11572 * 10^4 / 18658.
- */
-static const struct polynomial __maybe_unused poly_volt_to_N = {
- .total_divider = 10,
- .terms = {
- {1, 18658, 1000, 1},
- {0, -11572, 1, 1}
- }
-};
-
-static const struct polynomial poly_N_to_volt = {
- .total_divider = 10,
- .terms = {
- {1, 100000, 18658, 1},
- {0, 115720000, 1, 18658}
- }
-};
-
-static inline u32 pvt_update(void __iomem *reg, u32 mask, u32 data)
-{
- u32 old;
-
- old = readl_relaxed(reg);
- writel((old & ~mask) | (data & mask), reg);
-
- return old & mask;
-}
-
-/*
- * Baikal-T1 PVT mode can be updated only when the controller is disabled.
- * So first we disable it, then set the new mode together with the controller
- * getting back enabled. The same concerns the temperature trim and
- * measurements timeout. If it is necessary the interface mutex is supposed
- * to be locked at the time the operations are performed.
- */
-static inline void pvt_set_mode(struct pvt_hwmon *pvt, u32 mode)
-{
- u32 old;
-
- mode = FIELD_PREP(PVT_CTRL_MODE_MASK, mode);
-
- old = pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_MODE_MASK | PVT_CTRL_EN,
- mode | old);
-}
-
-static inline u32 pvt_calc_trim(long temp)
-{
- temp = clamp_val(temp, 0, PVT_TRIM_TEMP);
-
- return DIV_ROUND_UP(temp, PVT_TRIM_STEP);
-}
-
-static inline void pvt_set_trim(struct pvt_hwmon *pvt, u32 trim)
-{
- u32 old;
-
- trim = FIELD_PREP(PVT_CTRL_TRIM_MASK, trim);
-
- old = pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_TRIM_MASK | PVT_CTRL_EN,
- trim | old);
-}
-
-static inline void pvt_set_tout(struct pvt_hwmon *pvt, u32 tout)
-{
- u32 old;
-
- old = pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0);
- writel(tout, pvt->regs + PVT_TTIMEOUT);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, old);
-}
-
-/*
- * This driver can optionally provide the hwmon alarms for each sensor the PVT
- * controller supports. The alarms functionality is made compile-time
- * configurable due to the hardware interface implementation peculiarity
- * described further in this comment. So in case if alarms are unnecessary in
- * your system design it's recommended to have them disabled to prevent the PVT
- * IRQs being periodically raised to get the data cache/alarms status up to
- * date.
- *
- * Baikal-T1 PVT embedded controller is based on the Analog Bits PVT sensor,
- * but is equipped with a dedicated control wrapper. It exposes the PVT
- * sub-block registers space via the APB3 bus. In addition the wrapper provides
- * a common interrupt vector of the sensors conversion completion events and
- * threshold value alarms. Alas the wrapper interface hasn't been fully thought
- * through. There is only one sensor can be activated at a time, for which the
- * thresholds comparator is enabled right after the data conversion is
- * completed. Due to this if alarms need to be implemented for all available
- * sensors we can't just set the thresholds and enable the interrupts. We need
- * to enable the sensors one after another and let the controller to detect
- * the alarms by itself at each conversion. This also makes pointless to handle
- * the alarms interrupts, since in occasion they happen synchronously with
- * data conversion completion. The best driver design would be to have the
- * completion interrupts enabled only and keep the converted value in the
- * driver data cache. This solution is implemented if hwmon alarms are enabled
- * in this driver. In case if the alarms are disabled, the conversion is
- * performed on demand at the time a sensors input file is read.
- */
-
-#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
-
-#define pvt_hard_isr NULL
-
-static irqreturn_t pvt_soft_isr(int irq, void *data)
-{
- const struct pvt_sensor_info *info;
- struct pvt_hwmon *pvt = data;
- struct pvt_cache *cache;
- u32 val, thres_sts, old;
-
- /*
- * DVALID bit will be cleared by reading the data. We need to save the
- * status before the next conversion happens. Threshold events will be
- * handled a bit later.
- */
- thres_sts = readl(pvt->regs + PVT_RAW_INTR_STAT);
-
- /*
- * Then lets recharge the PVT interface with the next sampling mode.
- * Lock the interface mutex to serialize trim, timeouts and alarm
- * thresholds settings.
- */
- cache = &pvt->cache[pvt->sensor];
- info = &pvt_info[pvt->sensor];
- pvt->sensor = (pvt->sensor == PVT_SENSOR_LAST) ?
- PVT_SENSOR_FIRST : (pvt->sensor + 1);
-
- /*
- * For some reason we have to mask the interrupt before changing the
- * mode, otherwise sometimes the temperature mode doesn't get
- * activated even though the actual mode in the ctrl register
- * corresponds to one. Then we read the data. By doing so we also
- * recharge the data conversion. After this the mode corresponding
- * to the next sensor in the row is set. Finally we enable the
- * interrupts back.
- */
- mutex_lock(&pvt->iface_mtx);
-
- old = pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID,
- PVT_INTR_DVALID);
-
- val = readl(pvt->regs + PVT_DATA);
-
- pvt_set_mode(pvt, pvt_info[pvt->sensor].mode);
-
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID, old);
-
- mutex_unlock(&pvt->iface_mtx);
-
- /*
- * We can now update the data cache with data just retrieved from the
- * sensor. Lock write-seqlock to make sure the reader has a coherent
- * data.
- */
- write_seqlock(&cache->data_seqlock);
-
- cache->data = FIELD_GET(PVT_DATA_DATA_MASK, val);
-
- write_sequnlock(&cache->data_seqlock);
-
- /*
- * While PVT core is doing the next mode data conversion, we'll check
- * whether the alarms were triggered for the current sensor. Note that
- * according to the documentation only one threshold IRQ status can be
- * set at a time, that's why if-else statement is utilized.
- */
- if ((thres_sts & info->thres_sts_lo) ^ cache->thres_sts_lo) {
- WRITE_ONCE(cache->thres_sts_lo, thres_sts & info->thres_sts_lo);
- hwmon_notify_event(pvt->hwmon, info->type, info->attr_min_alarm,
- info->channel);
- } else if ((thres_sts & info->thres_sts_hi) ^ cache->thres_sts_hi) {
- WRITE_ONCE(cache->thres_sts_hi, thres_sts & info->thres_sts_hi);
- hwmon_notify_event(pvt->hwmon, info->type, info->attr_max_alarm,
- info->channel);
- }
-
- return IRQ_HANDLED;
-}
-
-static inline umode_t pvt_limit_is_visible(enum pvt_sensor_type type)
-{
- return 0644;
-}
-
-static inline umode_t pvt_alarm_is_visible(enum pvt_sensor_type type)
-{
- return 0444;
-}
-
-static int pvt_read_data(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- long *val)
-{
- struct pvt_cache *cache = &pvt->cache[type];
- unsigned int seq;
- u32 data;
-
- do {
- seq = read_seqbegin(&cache->data_seqlock);
- data = cache->data;
- } while (read_seqretry(&cache->data_seqlock, seq));
-
- if (type == PVT_TEMP)
- *val = polynomial_calc(&poly_N_to_temp, data);
- else
- *val = polynomial_calc(&poly_N_to_volt, data);
-
- return 0;
-}
-
-static int pvt_read_limit(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- bool is_low, long *val)
-{
- u32 data;
-
- /* No need in serialization, since it is just read from MMIO. */
- data = readl(pvt->regs + pvt_info[type].thres_base);
-
- if (is_low)
- data = FIELD_GET(PVT_THRES_LO_MASK, data);
- else
- data = FIELD_GET(PVT_THRES_HI_MASK, data);
-
- if (type == PVT_TEMP)
- *val = polynomial_calc(&poly_N_to_temp, data);
- else
- *val = polynomial_calc(&poly_N_to_volt, data);
-
- return 0;
-}
-
-static int pvt_write_limit(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- bool is_low, long val)
-{
- u32 data, limit, mask;
- int ret;
-
- if (type == PVT_TEMP) {
- val = clamp(val, PVT_TEMP_MIN, PVT_TEMP_MAX);
- data = polynomial_calc(&poly_temp_to_N, val);
- } else {
- val = clamp(val, PVT_VOLT_MIN, PVT_VOLT_MAX);
- data = polynomial_calc(&poly_volt_to_N, val);
- }
-
- /* Serialize limit update, since a part of the register is changed. */
- ret = mutex_lock_interruptible(&pvt->iface_mtx);
- if (ret)
- return ret;
-
- /* Make sure the upper and lower ranges don't intersect. */
- limit = readl(pvt->regs + pvt_info[type].thres_base);
- if (is_low) {
- limit = FIELD_GET(PVT_THRES_HI_MASK, limit);
- data = clamp_val(data, PVT_DATA_MIN, limit);
- data = FIELD_PREP(PVT_THRES_LO_MASK, data);
- mask = PVT_THRES_LO_MASK;
- } else {
- limit = FIELD_GET(PVT_THRES_LO_MASK, limit);
- data = clamp_val(data, limit, PVT_DATA_MAX);
- data = FIELD_PREP(PVT_THRES_HI_MASK, data);
- mask = PVT_THRES_HI_MASK;
- }
-
- pvt_update(pvt->regs + pvt_info[type].thres_base, mask, data);
-
- mutex_unlock(&pvt->iface_mtx);
-
- return 0;
-}
-
-static int pvt_read_alarm(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- bool is_low, long *val)
-{
- if (is_low)
- *val = !!READ_ONCE(pvt->cache[type].thres_sts_lo);
- else
- *val = !!READ_ONCE(pvt->cache[type].thres_sts_hi);
-
- return 0;
-}
-
-static const struct hwmon_channel_info * const pvt_channel_info[] = {
- HWMON_CHANNEL_INFO(chip,
- HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
- HWMON_CHANNEL_INFO(temp,
- HWMON_T_INPUT | HWMON_T_TYPE | HWMON_T_LABEL |
- HWMON_T_MIN | HWMON_T_MIN_ALARM |
- HWMON_T_MAX | HWMON_T_MAX_ALARM |
- HWMON_T_OFFSET),
- HWMON_CHANNEL_INFO(in,
- HWMON_I_INPUT | HWMON_I_LABEL |
- HWMON_I_MIN | HWMON_I_MIN_ALARM |
- HWMON_I_MAX | HWMON_I_MAX_ALARM,
- HWMON_I_INPUT | HWMON_I_LABEL |
- HWMON_I_MIN | HWMON_I_MIN_ALARM |
- HWMON_I_MAX | HWMON_I_MAX_ALARM,
- HWMON_I_INPUT | HWMON_I_LABEL |
- HWMON_I_MIN | HWMON_I_MIN_ALARM |
- HWMON_I_MAX | HWMON_I_MAX_ALARM,
- HWMON_I_INPUT | HWMON_I_LABEL |
- HWMON_I_MIN | HWMON_I_MIN_ALARM |
- HWMON_I_MAX | HWMON_I_MAX_ALARM),
- NULL
-};
-
-#else /* !CONFIG_SENSORS_BT1_PVT_ALARMS */
-
-static irqreturn_t pvt_hard_isr(int irq, void *data)
-{
- struct pvt_hwmon *pvt = data;
- struct pvt_cache *cache;
- u32 val;
-
- /*
- * Mask the DVALID interrupt so after exiting from the handler a
- * repeated conversion wouldn't happen.
- */
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID,
- PVT_INTR_DVALID);
-
- /*
- * Nothing special for alarm-less driver. Just read the data, update
- * the cache and notify a waiter of this event.
- */
- val = readl(pvt->regs + PVT_DATA);
- if (!(val & PVT_DATA_VALID)) {
- dev_err(pvt->dev, "Got IRQ when data isn't valid\n");
- return IRQ_HANDLED;
- }
-
- cache = &pvt->cache[pvt->sensor];
-
- WRITE_ONCE(cache->data, FIELD_GET(PVT_DATA_DATA_MASK, val));
-
- complete(&cache->conversion);
-
- return IRQ_HANDLED;
-}
-
-#define pvt_soft_isr NULL
-
-static inline umode_t pvt_limit_is_visible(enum pvt_sensor_type type)
-{
- return 0;
-}
-
-static inline umode_t pvt_alarm_is_visible(enum pvt_sensor_type type)
-{
- return 0;
-}
-
-static int pvt_read_data(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- long *val)
-{
- struct pvt_cache *cache = &pvt->cache[type];
- unsigned long timeout;
- u32 data;
- int ret;
-
- /*
- * Lock PVT conversion interface until data cache is updated. The
- * data read procedure is following: set the requested PVT sensor
- * mode, enable IRQ and conversion, wait until conversion is finished,
- * then disable conversion and IRQ, and read the cached data.
- */
- ret = mutex_lock_interruptible(&pvt->iface_mtx);
- if (ret)
- return ret;
-
- pvt->sensor = type;
- pvt_set_mode(pvt, pvt_info[type].mode);
-
- /*
- * Unmask the DVALID interrupt and enable the sensors conversions.
- * Do the reverse procedure when conversion is done.
- */
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID, 0);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, PVT_CTRL_EN);
-
- /*
- * Wait with timeout since in case if the sensor is suddenly powered
- * down the request won't be completed and the caller will hang up on
- * this procedure until the power is back up again. Multiply the
- * timeout by the factor of two to prevent a false timeout.
- */
- timeout = 2 * usecs_to_jiffies(ktime_to_us(pvt->timeout));
- ret = wait_for_completion_timeout(&cache->conversion, timeout);
-
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0);
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID,
- PVT_INTR_DVALID);
-
- data = READ_ONCE(cache->data);
-
- mutex_unlock(&pvt->iface_mtx);
-
- if (!ret)
- return -ETIMEDOUT;
-
- if (type == PVT_TEMP)
- *val = polynomial_calc(&poly_N_to_temp, data);
- else
- *val = polynomial_calc(&poly_N_to_volt, data);
-
- return 0;
-}
-
-static int pvt_read_limit(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- bool is_low, long *val)
-{
- return -EOPNOTSUPP;
-}
-
-static int pvt_write_limit(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- bool is_low, long val)
-{
- return -EOPNOTSUPP;
-}
-
-static int pvt_read_alarm(struct pvt_hwmon *pvt, enum pvt_sensor_type type,
- bool is_low, long *val)
-{
- return -EOPNOTSUPP;
-}
-
-static const struct hwmon_channel_info * const pvt_channel_info[] = {
- HWMON_CHANNEL_INFO(chip,
- HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
- HWMON_CHANNEL_INFO(temp,
- HWMON_T_INPUT | HWMON_T_TYPE | HWMON_T_LABEL |
- HWMON_T_OFFSET),
- HWMON_CHANNEL_INFO(in,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT | HWMON_I_LABEL),
- NULL
-};
-
-#endif /* !CONFIG_SENSORS_BT1_PVT_ALARMS */
-
-static inline bool pvt_hwmon_channel_is_valid(enum hwmon_sensor_types type,
- int ch)
-{
- switch (type) {
- case hwmon_temp:
- if (ch < 0 || ch >= PVT_TEMP_CHS)
- return false;
- break;
- case hwmon_in:
- if (ch < 0 || ch >= PVT_VOLT_CHS)
- return false;
- break;
- default:
- break;
- }
-
- /* The rest of the types are independent from the channel number. */
- return true;
-}
-
-static umode_t pvt_hwmon_is_visible(const void *data,
- enum hwmon_sensor_types type,
- u32 attr, int ch)
-{
- if (!pvt_hwmon_channel_is_valid(type, ch))
- return 0;
-
- switch (type) {
- case hwmon_chip:
- switch (attr) {
- case hwmon_chip_update_interval:
- return 0644;
- }
- break;
- case hwmon_temp:
- switch (attr) {
- case hwmon_temp_input:
- case hwmon_temp_type:
- case hwmon_temp_label:
- return 0444;
- case hwmon_temp_min:
- case hwmon_temp_max:
- return pvt_limit_is_visible(ch);
- case hwmon_temp_min_alarm:
- case hwmon_temp_max_alarm:
- return pvt_alarm_is_visible(ch);
- case hwmon_temp_offset:
- return 0644;
- }
- break;
- case hwmon_in:
- switch (attr) {
- case hwmon_in_input:
- case hwmon_in_label:
- return 0444;
- case hwmon_in_min:
- case hwmon_in_max:
- return pvt_limit_is_visible(PVT_VOLT + ch);
- case hwmon_in_min_alarm:
- case hwmon_in_max_alarm:
- return pvt_alarm_is_visible(PVT_VOLT + ch);
- }
- break;
- default:
- break;
- }
-
- return 0;
-}
-
-static int pvt_read_trim(struct pvt_hwmon *pvt, long *val)
-{
- u32 data;
-
- data = readl(pvt->regs + PVT_CTRL);
- *val = FIELD_GET(PVT_CTRL_TRIM_MASK, data) * PVT_TRIM_STEP;
-
- return 0;
-}
-
-static int pvt_write_trim(struct pvt_hwmon *pvt, long val)
-{
- u32 trim;
- int ret;
-
- /*
- * Serialize trim update, since a part of the register is changed and
- * the controller is supposed to be disabled during this operation.
- */
- ret = mutex_lock_interruptible(&pvt->iface_mtx);
- if (ret)
- return ret;
-
- trim = pvt_calc_trim(val);
- pvt_set_trim(pvt, trim);
-
- mutex_unlock(&pvt->iface_mtx);
-
- return 0;
-}
-
-static int pvt_read_timeout(struct pvt_hwmon *pvt, long *val)
-{
- int ret;
-
- ret = mutex_lock_interruptible(&pvt->iface_mtx);
- if (ret)
- return ret;
-
- /* Return the result in msec as hwmon sysfs interface requires. */
- *val = ktime_to_ms(pvt->timeout);
-
- mutex_unlock(&pvt->iface_mtx);
-
- return 0;
-}
-
-static int pvt_write_timeout(struct pvt_hwmon *pvt, long val)
-{
- unsigned long rate;
- ktime_t kt, cache;
- u32 data;
- int ret;
-
- rate = clk_get_rate(pvt->clks[PVT_CLOCK_REF].clk);
- if (!rate)
- return -ENODEV;
-
- /*
- * If alarms are enabled, the requested timeout must be divided
- * between all available sensors to have the requested delay
- * applicable to each individual sensor.
- */
- cache = kt = ms_to_ktime(val);
-#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
- kt = ktime_divns(kt, PVT_SENSORS_NUM);
-#endif
-
- /*
- * Subtract a constant lag, which always persists due to the limited
- * PVT sampling rate. Make sure the timeout is not negative.
- */
- kt = ktime_sub_ns(kt, PVT_TOUT_MIN);
- if (ktime_to_ns(kt) < 0)
- kt = ktime_set(0, 0);
-
- /*
- * Finally recalculate the timeout in terms of the reference clock
- * period.
- */
- data = ktime_divns(kt * rate, NSEC_PER_SEC);
-
- /*
- * Update the measurements delay, but lock the interface first, since
- * we have to disable PVT in order to have the new delay actually
- * updated.
- */
- ret = mutex_lock_interruptible(&pvt->iface_mtx);
- if (ret)
- return ret;
-
- pvt_set_tout(pvt, data);
- pvt->timeout = cache;
-
- mutex_unlock(&pvt->iface_mtx);
-
- return 0;
-}
-
-static int pvt_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
- u32 attr, int ch, long *val)
-{
- struct pvt_hwmon *pvt = dev_get_drvdata(dev);
-
- if (!pvt_hwmon_channel_is_valid(type, ch))
- return -EINVAL;
-
- switch (type) {
- case hwmon_chip:
- switch (attr) {
- case hwmon_chip_update_interval:
- return pvt_read_timeout(pvt, val);
- }
- break;
- case hwmon_temp:
- switch (attr) {
- case hwmon_temp_input:
- return pvt_read_data(pvt, ch, val);
- case hwmon_temp_type:
- *val = 1;
- return 0;
- case hwmon_temp_min:
- return pvt_read_limit(pvt, ch, true, val);
- case hwmon_temp_max:
- return pvt_read_limit(pvt, ch, false, val);
- case hwmon_temp_min_alarm:
- return pvt_read_alarm(pvt, ch, true, val);
- case hwmon_temp_max_alarm:
- return pvt_read_alarm(pvt, ch, false, val);
- case hwmon_temp_offset:
- return pvt_read_trim(pvt, val);
- }
- break;
- case hwmon_in:
- switch (attr) {
- case hwmon_in_input:
- return pvt_read_data(pvt, PVT_VOLT + ch, val);
- case hwmon_in_min:
- return pvt_read_limit(pvt, PVT_VOLT + ch, true, val);
- case hwmon_in_max:
- return pvt_read_limit(pvt, PVT_VOLT + ch, false, val);
- case hwmon_in_min_alarm:
- return pvt_read_alarm(pvt, PVT_VOLT + ch, true, val);
- case hwmon_in_max_alarm:
- return pvt_read_alarm(pvt, PVT_VOLT + ch, false, val);
- }
- break;
- default:
- break;
- }
-
- return -EOPNOTSUPP;
-}
-
-static int pvt_hwmon_read_string(struct device *dev,
- enum hwmon_sensor_types type,
- u32 attr, int ch, const char **str)
-{
- if (!pvt_hwmon_channel_is_valid(type, ch))
- return -EINVAL;
-
- switch (type) {
- case hwmon_temp:
- switch (attr) {
- case hwmon_temp_label:
- *str = pvt_info[ch].label;
- return 0;
- }
- break;
- case hwmon_in:
- switch (attr) {
- case hwmon_in_label:
- *str = pvt_info[PVT_VOLT + ch].label;
- return 0;
- }
- break;
- default:
- break;
- }
-
- return -EOPNOTSUPP;
-}
-
-static int pvt_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
- u32 attr, int ch, long val)
-{
- struct pvt_hwmon *pvt = dev_get_drvdata(dev);
-
- if (!pvt_hwmon_channel_is_valid(type, ch))
- return -EINVAL;
-
- switch (type) {
- case hwmon_chip:
- switch (attr) {
- case hwmon_chip_update_interval:
- return pvt_write_timeout(pvt, val);
- }
- break;
- case hwmon_temp:
- switch (attr) {
- case hwmon_temp_min:
- return pvt_write_limit(pvt, ch, true, val);
- case hwmon_temp_max:
- return pvt_write_limit(pvt, ch, false, val);
- case hwmon_temp_offset:
- return pvt_write_trim(pvt, val);
- }
- break;
- case hwmon_in:
- switch (attr) {
- case hwmon_in_min:
- return pvt_write_limit(pvt, PVT_VOLT + ch, true, val);
- case hwmon_in_max:
- return pvt_write_limit(pvt, PVT_VOLT + ch, false, val);
- }
- break;
- default:
- break;
- }
-
- return -EOPNOTSUPP;
-}
-
-static const struct hwmon_ops pvt_hwmon_ops = {
- .is_visible = pvt_hwmon_is_visible,
- .read = pvt_hwmon_read,
- .read_string = pvt_hwmon_read_string,
- .write = pvt_hwmon_write
-};
-
-static const struct hwmon_chip_info pvt_hwmon_info = {
- .ops = &pvt_hwmon_ops,
- .info = pvt_channel_info
-};
-
-static void pvt_clear_data(void *data)
-{
- struct pvt_hwmon *pvt = data;
-#if !defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
- int idx;
-
- for (idx = 0; idx < PVT_SENSORS_NUM; ++idx)
- complete_all(&pvt->cache[idx].conversion);
-#endif
-
- mutex_destroy(&pvt->iface_mtx);
-}
-
-static struct pvt_hwmon *pvt_create_data(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct pvt_hwmon *pvt;
- int ret, idx;
-
- pvt = devm_kzalloc(dev, sizeof(*pvt), GFP_KERNEL);
- if (!pvt)
- return ERR_PTR(-ENOMEM);
-
- ret = devm_add_action(dev, pvt_clear_data, pvt);
- if (ret) {
- dev_err(dev, "Can't add PVT data clear action\n");
- return ERR_PTR(ret);
- }
-
- pvt->dev = dev;
- pvt->sensor = PVT_SENSOR_FIRST;
- mutex_init(&pvt->iface_mtx);
-
-#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
- for (idx = 0; idx < PVT_SENSORS_NUM; ++idx)
- seqlock_init(&pvt->cache[idx].data_seqlock);
-#else
- for (idx = 0; idx < PVT_SENSORS_NUM; ++idx)
- init_completion(&pvt->cache[idx].conversion);
-#endif
-
- return pvt;
-}
-
-static int pvt_request_regs(struct pvt_hwmon *pvt)
-{
- struct platform_device *pdev = to_platform_device(pvt->dev);
-
- pvt->regs = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(pvt->regs))
- return PTR_ERR(pvt->regs);
-
- return 0;
-}
-
-static void pvt_disable_clks(void *data)
-{
- struct pvt_hwmon *pvt = data;
-
- clk_bulk_disable_unprepare(PVT_CLOCK_NUM, pvt->clks);
-}
-
-static int pvt_request_clks(struct pvt_hwmon *pvt)
-{
- int ret;
-
- pvt->clks[PVT_CLOCK_APB].id = "pclk";
- pvt->clks[PVT_CLOCK_REF].id = "ref";
-
- ret = devm_clk_bulk_get(pvt->dev, PVT_CLOCK_NUM, pvt->clks);
- if (ret) {
- dev_err(pvt->dev, "Couldn't get PVT clocks descriptors\n");
- return ret;
- }
-
- ret = clk_bulk_prepare_enable(PVT_CLOCK_NUM, pvt->clks);
- if (ret) {
- dev_err(pvt->dev, "Couldn't enable the PVT clocks\n");
- return ret;
- }
-
- ret = devm_add_action_or_reset(pvt->dev, pvt_disable_clks, pvt);
- if (ret) {
- dev_err(pvt->dev, "Can't add PVT clocks disable action\n");
- return ret;
- }
-
- return 0;
-}
-
-static int pvt_check_pwr(struct pvt_hwmon *pvt)
-{
- unsigned long tout;
- int ret = 0;
- u32 data;
-
- /*
- * Test out the sensor conversion functionality. If it is not done on
- * time then the domain must have been unpowered and we won't be able
- * to use the device later in this driver.
- * Note If the power source is lost during the normal driver work the
- * data read procedure will either return -ETIMEDOUT (for the
- * alarm-less driver configuration) or just stop the repeated
- * conversion. In the later case alas we won't be able to detect the
- * problem.
- */
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_ALL, PVT_INTR_ALL);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, PVT_CTRL_EN);
- pvt_set_tout(pvt, 0);
- readl(pvt->regs + PVT_DATA);
-
- tout = PVT_TOUT_MIN / NSEC_PER_USEC;
- usleep_range(tout, 2 * tout);
-
- data = readl(pvt->regs + PVT_DATA);
- if (!(data & PVT_DATA_VALID)) {
- ret = -ENODEV;
- dev_err(pvt->dev, "Sensor is powered down\n");
- }
-
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0);
-
- return ret;
-}
-
-static int pvt_init_iface(struct pvt_hwmon *pvt)
-{
- unsigned long rate;
- u32 trim, temp;
-
- rate = clk_get_rate(pvt->clks[PVT_CLOCK_REF].clk);
- if (!rate) {
- dev_err(pvt->dev, "Invalid reference clock rate\n");
- return -ENODEV;
- }
-
- /*
- * Make sure all interrupts and controller are disabled so not to
- * accidentally have ISR executed before the driver data is fully
- * initialized. Clear the IRQ status as well.
- */
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_ALL, PVT_INTR_ALL);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0);
- readl(pvt->regs + PVT_CLR_INTR);
- readl(pvt->regs + PVT_DATA);
-
- /* Setup default sensor mode, timeout and temperature trim. */
- pvt_set_mode(pvt, pvt_info[pvt->sensor].mode);
- pvt_set_tout(pvt, PVT_TOUT_DEF);
-
- /*
- * Preserve the current ref-clock based delay (Ttotal) between the
- * sensors data samples in the driver data so not to recalculate it
- * each time on the data requests and timeout reads. It consists of the
- * delay introduced by the internal ref-clock timer (N / Fclk) and the
- * constant timeout caused by each conversion latency (Tmin):
- * Ttotal = N / Fclk + Tmin
- * If alarms are enabled the sensors are polled one after another and
- * in order to get the next measurement of a particular sensor the
- * caller will have to wait for at most until all the others are
- * polled. In that case the formulae will look a bit different:
- * Ttotal = 5 * (N / Fclk + Tmin)
- */
-#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
- pvt->timeout = ktime_set(PVT_SENSORS_NUM * PVT_TOUT_DEF, 0);
- pvt->timeout = ktime_divns(pvt->timeout, rate);
- pvt->timeout = ktime_add_ns(pvt->timeout, PVT_SENSORS_NUM * PVT_TOUT_MIN);
-#else
- pvt->timeout = ktime_set(PVT_TOUT_DEF, 0);
- pvt->timeout = ktime_divns(pvt->timeout, rate);
- pvt->timeout = ktime_add_ns(pvt->timeout, PVT_TOUT_MIN);
-#endif
-
- trim = PVT_TRIM_DEF;
- if (!of_property_read_u32(pvt->dev->of_node,
- "baikal,pvt-temp-offset-millicelsius", &temp))
- trim = pvt_calc_trim(temp);
-
- pvt_set_trim(pvt, trim);
-
- return 0;
-}
-
-static int pvt_request_irq(struct pvt_hwmon *pvt)
-{
- struct platform_device *pdev = to_platform_device(pvt->dev);
- int ret;
-
- pvt->irq = platform_get_irq(pdev, 0);
- if (pvt->irq < 0)
- return pvt->irq;
-
- ret = devm_request_threaded_irq(pvt->dev, pvt->irq,
- pvt_hard_isr, pvt_soft_isr,
-#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
- IRQF_SHARED | IRQF_TRIGGER_HIGH |
- IRQF_ONESHOT,
-#else
- IRQF_SHARED | IRQF_TRIGGER_HIGH,
-#endif
- "pvt", pvt);
- if (ret) {
- dev_err(pvt->dev, "Couldn't request PVT IRQ\n");
- return ret;
- }
-
- return 0;
-}
-
-static int pvt_create_hwmon(struct pvt_hwmon *pvt)
-{
- pvt->hwmon = devm_hwmon_device_register_with_info(pvt->dev, "pvt", pvt,
- &pvt_hwmon_info, NULL);
- if (IS_ERR(pvt->hwmon)) {
- dev_err(pvt->dev, "Couldn't create hwmon device\n");
- return PTR_ERR(pvt->hwmon);
- }
-
- return 0;
-}
-
-#if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
-
-static void pvt_disable_iface(void *data)
-{
- struct pvt_hwmon *pvt = data;
-
- mutex_lock(&pvt->iface_mtx);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0);
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID,
- PVT_INTR_DVALID);
- mutex_unlock(&pvt->iface_mtx);
-}
-
-static int pvt_enable_iface(struct pvt_hwmon *pvt)
-{
- int ret;
-
- ret = devm_add_action(pvt->dev, pvt_disable_iface, pvt);
- if (ret) {
- dev_err(pvt->dev, "Can't add PVT disable interface action\n");
- return ret;
- }
-
- /*
- * Enable sensors data conversion and IRQ. We need to lock the
- * interface mutex since hwmon has just been created and the
- * corresponding sysfs files are accessible from user-space,
- * which theoretically may cause races.
- */
- mutex_lock(&pvt->iface_mtx);
- pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID, 0);
- pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, PVT_CTRL_EN);
- mutex_unlock(&pvt->iface_mtx);
-
- return 0;
-}
-
-#else /* !CONFIG_SENSORS_BT1_PVT_ALARMS */
-
-static int pvt_enable_iface(struct pvt_hwmon *pvt)
-{
- return 0;
-}
-
-#endif /* !CONFIG_SENSORS_BT1_PVT_ALARMS */
-
-static int pvt_probe(struct platform_device *pdev)
-{
- struct pvt_hwmon *pvt;
- int ret;
-
- pvt = pvt_create_data(pdev);
- if (IS_ERR(pvt))
- return PTR_ERR(pvt);
-
- ret = pvt_request_regs(pvt);
- if (ret)
- return ret;
-
- ret = pvt_request_clks(pvt);
- if (ret)
- return ret;
-
- ret = pvt_check_pwr(pvt);
- if (ret)
- return ret;
-
- ret = pvt_init_iface(pvt);
- if (ret)
- return ret;
-
- ret = pvt_request_irq(pvt);
- if (ret)
- return ret;
-
- ret = pvt_create_hwmon(pvt);
- if (ret)
- return ret;
-
- ret = pvt_enable_iface(pvt);
- if (ret)
- return ret;
-
- return 0;
-}
-
-static const struct of_device_id pvt_of_match[] = {
- { .compatible = "baikal,bt1-pvt" },
- { }
-};
-MODULE_DEVICE_TABLE(of, pvt_of_match);
-
-static struct platform_driver pvt_driver = {
- .probe = pvt_probe,
- .driver = {
- .name = "bt1-pvt",
- .of_match_table = pvt_of_match
- }
-};
-module_platform_driver(pvt_driver);
-
-MODULE_AUTHOR("Maxim Kaurkin <maxim.kaurkin@baikalelectronics.ru>");
-MODULE_DESCRIPTION("Baikal-T1 PVT driver");
-MODULE_LICENSE("GPL v2");
+++ /dev/null
-/* 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__ */
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