1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
5 * Baikal-T1 Process, Voltage, Temperature sensor driver
7 #ifndef __HWMON_BT1_PVT_H__
8 #define __HWMON_BT1_PVT_H__
10 #include <linux/completion.h>
11 #include <linux/hwmon.h>
12 #include <linux/kernel.h>
13 #include <linux/ktime.h>
14 #include <linux/mutex.h>
15 #include <linux/seqlock.h>
17 /* Baikal-T1 PVT registers and their bitfields */
19 #define PVT_CTRL_EN BIT(0)
20 #define PVT_CTRL_MODE_FLD 1
21 #define PVT_CTRL_MODE_MASK GENMASK(3, PVT_CTRL_MODE_FLD)
22 #define PVT_CTRL_MODE_TEMP 0x0
23 #define PVT_CTRL_MODE_VOLT 0x1
24 #define PVT_CTRL_MODE_LVT 0x2
25 #define PVT_CTRL_MODE_HVT 0x4
26 #define PVT_CTRL_MODE_SVT 0x6
27 #define PVT_CTRL_TRIM_FLD 4
28 #define PVT_CTRL_TRIM_MASK GENMASK(8, PVT_CTRL_TRIM_FLD)
30 #define PVT_DATA_VALID BIT(10)
31 #define PVT_DATA_DATA_FLD 0
32 #define PVT_DATA_DATA_MASK GENMASK(9, PVT_DATA_DATA_FLD)
33 #define PVT_TTHRES 0x08
34 #define PVT_VTHRES 0x0C
35 #define PVT_LTHRES 0x10
36 #define PVT_HTHRES 0x14
37 #define PVT_STHRES 0x18
38 #define PVT_THRES_LO_FLD 0
39 #define PVT_THRES_LO_MASK GENMASK(9, PVT_THRES_LO_FLD)
40 #define PVT_THRES_HI_FLD 10
41 #define PVT_THRES_HI_MASK GENMASK(19, PVT_THRES_HI_FLD)
42 #define PVT_TTIMEOUT 0x1C
43 #define PVT_INTR_STAT 0x20
44 #define PVT_INTR_MASK 0x24
45 #define PVT_RAW_INTR_STAT 0x28
46 #define PVT_INTR_DVALID BIT(0)
47 #define PVT_INTR_TTHRES_LO BIT(1)
48 #define PVT_INTR_TTHRES_HI BIT(2)
49 #define PVT_INTR_VTHRES_LO BIT(3)
50 #define PVT_INTR_VTHRES_HI BIT(4)
51 #define PVT_INTR_LTHRES_LO BIT(5)
52 #define PVT_INTR_LTHRES_HI BIT(6)
53 #define PVT_INTR_HTHRES_LO BIT(7)
54 #define PVT_INTR_HTHRES_HI BIT(8)
55 #define PVT_INTR_STHRES_LO BIT(9)
56 #define PVT_INTR_STHRES_HI BIT(10)
57 #define PVT_INTR_ALL GENMASK(10, 0)
58 #define PVT_CLR_INTR 0x2C
61 * PVT sensors-related limits and default values
62 * @PVT_TEMP_MIN: Minimal temperature in millidegrees of Celsius.
63 * @PVT_TEMP_MAX: Maximal temperature in millidegrees of Celsius.
64 * @PVT_TEMP_CHS: Number of temperature hwmon channels.
65 * @PVT_VOLT_MIN: Minimal voltage in mV.
66 * @PVT_VOLT_MAX: Maximal voltage in mV.
67 * @PVT_VOLT_CHS: Number of voltage hwmon channels.
68 * @PVT_DATA_MIN: Minimal PVT raw data value.
69 * @PVT_DATA_MAX: Maximal PVT raw data value.
70 * @PVT_TRIM_MIN: Minimal temperature sensor trim value.
71 * @PVT_TRIM_MAX: Maximal temperature sensor trim value.
72 * @PVT_TRIM_DEF: Default temperature sensor trim value (set a proper value
73 * when one is determined for Baikal-T1 SoC).
74 * @PVT_TRIM_TEMP: Maximum temperature encoded by the trim factor.
75 * @PVT_TRIM_STEP: Temperature stride corresponding to the trim value.
76 * @PVT_TOUT_MIN: Minimal timeout between samples in nanoseconds.
77 * @PVT_TOUT_DEF: Default data measurements timeout. In case if alarms are
78 * activated the PVT IRQ is enabled to be raised after each
79 * conversion in order to have the thresholds checked and the
80 * converted value cached. Too frequent conversions may cause
81 * the system CPU overload. Lets set the 50ms delay between
82 * them by default to prevent this.
84 #define PVT_TEMP_MIN -48380L
85 #define PVT_TEMP_MAX 147438L
86 #define PVT_TEMP_CHS 1
87 #define PVT_VOLT_MIN 620L
88 #define PVT_VOLT_MAX 1168L
89 #define PVT_VOLT_CHS 4
90 #define PVT_DATA_MIN 0
91 #define PVT_DATA_MAX (PVT_DATA_DATA_MASK >> PVT_DATA_DATA_FLD)
92 #define PVT_TRIM_MIN 0
93 #define PVT_TRIM_MAX (PVT_CTRL_TRIM_MASK >> PVT_CTRL_TRIM_FLD)
94 #define PVT_TRIM_TEMP 7130
95 #define PVT_TRIM_STEP (PVT_TRIM_TEMP / PVT_TRIM_MAX)
96 #define PVT_TRIM_DEF 0
97 #define PVT_TOUT_MIN (NSEC_PER_SEC / 3000)
98 #if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
99 # define PVT_TOUT_DEF 60000
101 # define PVT_TOUT_DEF 0
105 * enum pvt_sensor_type - Baikal-T1 PVT sensor types (correspond to each PVT
107 * @PVT_SENSOR*: helpers to traverse the sensors in loops.
108 * @PVT_TEMP: PVT Temperature sensor.
109 * @PVT_VOLT: PVT Voltage sensor.
110 * @PVT_LVT: PVT Low-Voltage threshold sensor.
111 * @PVT_HVT: PVT High-Voltage threshold sensor.
112 * @PVT_SVT: PVT Standard-Voltage threshold sensor.
114 enum pvt_sensor_type {
116 PVT_TEMP = PVT_SENSOR_FIRST,
121 PVT_SENSOR_LAST = PVT_SVT,
126 * enum pvt_clock_type - Baikal-T1 PVT clocks.
127 * @PVT_CLOCK_APB: APB clock.
128 * @PVT_CLOCK_REF: PVT reference clock.
130 enum pvt_clock_type {
137 * struct pvt_sensor_info - Baikal-T1 PVT sensor informational structure
138 * @channel: Sensor channel ID.
139 * @label: hwmon sensor label.
140 * @mode: PVT mode corresponding to the channel.
141 * @thres_base: upper and lower threshold values of the sensor.
142 * @thres_sts_lo: low threshold status bitfield.
143 * @thres_sts_hi: high threshold status bitfield.
144 * @type: Sensor type.
145 * @attr_min_alarm: Min alarm attribute ID.
146 * @attr_min_alarm: Max alarm attribute ID.
148 struct pvt_sensor_info {
152 unsigned long thres_base;
155 enum hwmon_sensor_types type;
160 #define PVT_SENSOR_INFO(_ch, _label, _type, _mode, _thres) \
164 .mode = PVT_CTRL_MODE_ ##_mode, \
165 .thres_base = PVT_ ##_thres, \
166 .thres_sts_lo = PVT_INTR_ ##_thres## _LO, \
167 .thres_sts_hi = PVT_INTR_ ##_thres## _HI, \
169 .attr_min_alarm = _type## _min, \
170 .attr_max_alarm = _type## _max, \
174 * struct pvt_cache - PVT sensors data cache
175 * @data: data cache in raw format.
176 * @thres_sts_lo: low threshold status saved on the previous data conversion.
177 * @thres_sts_hi: high threshold status saved on the previous data conversion.
178 * @data_seqlock: cached data seq-lock.
179 * @conversion: data conversion completion.
183 #if defined(CONFIG_SENSORS_BT1_PVT_ALARMS)
184 seqlock_t data_seqlock;
188 struct completion conversion;
193 * struct pvt_hwmon - Baikal-T1 PVT private data
194 * @dev: device structure of the PVT platform device.
195 * @hwmon: hwmon device structure.
196 * @regs: pointer to the Baikal-T1 PVT registers region.
197 * @irq: PVT events IRQ number.
198 * @clks: Array of the PVT clocks descriptor (APB/ref clocks).
199 * @ref_clk: Pointer to the reference clocks descriptor.
200 * @iface_mtx: Generic interface mutex (used to lock the alarm registers
201 * when the alarms enabled, or the data conversion interface
202 * if alarms are disabled).
203 * @sensor: current PVT sensor the data conversion is being performed for.
204 * @cache: data cache descriptor.
205 * @timeout: conversion timeout cache.
209 struct device *hwmon;
214 struct clk_bulk_data clks[PVT_CLOCK_NUM];
216 struct mutex iface_mtx;
217 enum pvt_sensor_type sensor;
218 struct pvt_cache cache[PVT_SENSORS_NUM];
223 * struct pvt_poly_term - a term descriptor of the PVT data translation
225 * @deg: degree of the term.
226 * @coef: multiplication factor of the term.
227 * @divider: distributed divider per each degree.
228 * @divider_leftover: divider leftover, which couldn't be redistributed.
230 struct pvt_poly_term {
234 long divider_leftover;
238 * struct pvt_poly - PVT data translation polynomial descriptor
239 * @total_divider: total data divider.
240 * @terms: polynomial terms up to a free one.
244 struct pvt_poly_term terms[];
247 #endif /* __HWMON_BT1_PVT_H__ */