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linux_dsm_epyc7002/drivers/thermal/qcom/tsens.h
Gustavo A. R. Silva 0a8cdc8b14 thermal: qcom: tsens.h: Replace zero-length array with flexible-array member 
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200319184838.GA25767@embeddedor.com
2020-03-23 15:20:47 +01:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
*/
#ifndef __QCOM_TSENS_H__
#define __QCOM_TSENS_H__
#define ONE_PT_CALIB 0x1
#define ONE_PT_CALIB2 0x2
#define TWO_PT_CALIB 0x3
#define CAL_DEGC_PT1 30
#define CAL_DEGC_PT2 120
#define SLOPE_FACTOR 1000
#define SLOPE_DEFAULT 3200
#define THRESHOLD_MAX_ADC_CODE 0x3ff
#define THRESHOLD_MIN_ADC_CODE 0x0
#include <linux/interrupt.h>
#include <linux/thermal.h>
#include <linux/regmap.h>
#include <linux/slab.h>
struct tsens_priv;
/* IP version numbers in ascending order */
enum tsens_ver {
VER_0_1 = 0,
VER_1_X,
VER_2_X,
};
enum tsens_irq_type {
LOWER,
UPPER,
CRITICAL,
};
/**
* struct tsens_sensor - data for each sensor connected to the tsens device
* @priv: tsens device instance that this sensor is connected to
* @tzd: pointer to the thermal zone that this sensor is in
* @offset: offset of temperature adjustment curve
* @hw_id: HW ID can be used in case of platform-specific IDs
* @slope: slope of temperature adjustment curve
* @status: 8960-specific variable to track 8960 and 8660 status register offset
*/
struct tsens_sensor {
struct tsens_priv *priv;
struct thermal_zone_device *tzd;
int offset;
unsigned int hw_id;
int slope;
u32 status;
};
/**
* struct tsens_ops - operations as supported by the tsens device
* @init: Function to initialize the tsens device
* @calibrate: Function to calibrate the tsens device
* @get_temp: Function which returns the temp in millidegC
* @enable: Function to enable (clocks/power) tsens device
* @disable: Function to disable the tsens device
* @suspend: Function to suspend the tsens device
* @resume: Function to resume the tsens device
* @get_trend: Function to get the thermal/temp trend
*/
struct tsens_ops {
/* mandatory callbacks */
int (*init)(struct tsens_priv *priv);
int (*calibrate)(struct tsens_priv *priv);
int (*get_temp)(const struct tsens_sensor *s, int *temp);
/* optional callbacks */
int (*enable)(struct tsens_priv *priv, int i);
void (*disable)(struct tsens_priv *priv);
int (*suspend)(struct tsens_priv *priv);
int (*resume)(struct tsens_priv *priv);
int (*get_trend)(struct tsens_sensor *s, enum thermal_trend *trend);
};
#define REG_FIELD_FOR_EACH_SENSOR11(_name, _offset, _startbit, _stopbit) \
[_name##_##0] = REG_FIELD(_offset, _startbit, _stopbit), \
[_name##_##1] = REG_FIELD(_offset + 4, _startbit, _stopbit), \
[_name##_##2] = REG_FIELD(_offset + 8, _startbit, _stopbit), \
[_name##_##3] = REG_FIELD(_offset + 12, _startbit, _stopbit), \
[_name##_##4] = REG_FIELD(_offset + 16, _startbit, _stopbit), \
[_name##_##5] = REG_FIELD(_offset + 20, _startbit, _stopbit), \
[_name##_##6] = REG_FIELD(_offset + 24, _startbit, _stopbit), \
[_name##_##7] = REG_FIELD(_offset + 28, _startbit, _stopbit), \
[_name##_##8] = REG_FIELD(_offset + 32, _startbit, _stopbit), \
[_name##_##9] = REG_FIELD(_offset + 36, _startbit, _stopbit), \
[_name##_##10] = REG_FIELD(_offset + 40, _startbit, _stopbit)
#define REG_FIELD_FOR_EACH_SENSOR16(_name, _offset, _startbit, _stopbit) \
[_name##_##0] = REG_FIELD(_offset, _startbit, _stopbit), \
[_name##_##1] = REG_FIELD(_offset + 4, _startbit, _stopbit), \
[_name##_##2] = REG_FIELD(_offset + 8, _startbit, _stopbit), \
[_name##_##3] = REG_FIELD(_offset + 12, _startbit, _stopbit), \
[_name##_##4] = REG_FIELD(_offset + 16, _startbit, _stopbit), \
[_name##_##5] = REG_FIELD(_offset + 20, _startbit, _stopbit), \
[_name##_##6] = REG_FIELD(_offset + 24, _startbit, _stopbit), \
[_name##_##7] = REG_FIELD(_offset + 28, _startbit, _stopbit), \
[_name##_##8] = REG_FIELD(_offset + 32, _startbit, _stopbit), \
[_name##_##9] = REG_FIELD(_offset + 36, _startbit, _stopbit), \
[_name##_##10] = REG_FIELD(_offset + 40, _startbit, _stopbit), \
[_name##_##11] = REG_FIELD(_offset + 44, _startbit, _stopbit), \
[_name##_##12] = REG_FIELD(_offset + 48, _startbit, _stopbit), \
[_name##_##13] = REG_FIELD(_offset + 52, _startbit, _stopbit), \
[_name##_##14] = REG_FIELD(_offset + 56, _startbit, _stopbit), \
[_name##_##15] = REG_FIELD(_offset + 60, _startbit, _stopbit)
#define REG_FIELD_SPLIT_BITS_0_15(_name, _offset) \
[_name##_##0] = REG_FIELD(_offset, 0, 0), \
[_name##_##1] = REG_FIELD(_offset, 1, 1), \
[_name##_##2] = REG_FIELD(_offset, 2, 2), \
[_name##_##3] = REG_FIELD(_offset, 3, 3), \
[_name##_##4] = REG_FIELD(_offset, 4, 4), \
[_name##_##5] = REG_FIELD(_offset, 5, 5), \
[_name##_##6] = REG_FIELD(_offset, 6, 6), \
[_name##_##7] = REG_FIELD(_offset, 7, 7), \
[_name##_##8] = REG_FIELD(_offset, 8, 8), \
[_name##_##9] = REG_FIELD(_offset, 9, 9), \
[_name##_##10] = REG_FIELD(_offset, 10, 10), \
[_name##_##11] = REG_FIELD(_offset, 11, 11), \
[_name##_##12] = REG_FIELD(_offset, 12, 12), \
[_name##_##13] = REG_FIELD(_offset, 13, 13), \
[_name##_##14] = REG_FIELD(_offset, 14, 14), \
[_name##_##15] = REG_FIELD(_offset, 15, 15)
#define REG_FIELD_SPLIT_BITS_16_31(_name, _offset) \
[_name##_##0] = REG_FIELD(_offset, 16, 16), \
[_name##_##1] = REG_FIELD(_offset, 17, 17), \
[_name##_##2] = REG_FIELD(_offset, 18, 18), \
[_name##_##3] = REG_FIELD(_offset, 19, 19), \
[_name##_##4] = REG_FIELD(_offset, 20, 20), \
[_name##_##5] = REG_FIELD(_offset, 21, 21), \
[_name##_##6] = REG_FIELD(_offset, 22, 22), \
[_name##_##7] = REG_FIELD(_offset, 23, 23), \
[_name##_##8] = REG_FIELD(_offset, 24, 24), \
[_name##_##9] = REG_FIELD(_offset, 25, 25), \
[_name##_##10] = REG_FIELD(_offset, 26, 26), \
[_name##_##11] = REG_FIELD(_offset, 27, 27), \
[_name##_##12] = REG_FIELD(_offset, 28, 28), \
[_name##_##13] = REG_FIELD(_offset, 29, 29), \
[_name##_##14] = REG_FIELD(_offset, 30, 30), \
[_name##_##15] = REG_FIELD(_offset, 31, 31)
/*
* reg_field IDs to use as an index into an array
* If you change the order of the entries, check the devm_regmap_field_alloc()
* calls in init_common()
*/
enum regfield_ids {
/* ----- SROT ------ */
/* HW_VER */
VER_MAJOR,
VER_MINOR,
VER_STEP,
/* CTRL_OFFSET */
TSENS_EN,
TSENS_SW_RST,
SENSOR_EN,
CODE_OR_TEMP,
/* ----- TM ------ */
/* TRDY */
TRDY,
/* INTERRUPT ENABLE */
INT_EN, /* v2+ has separate enables for crit, upper and lower irq */
/* STATUS */
LAST_TEMP_0, /* Last temperature reading */
LAST_TEMP_1,
LAST_TEMP_2,
LAST_TEMP_3,
LAST_TEMP_4,
LAST_TEMP_5,
LAST_TEMP_6,
LAST_TEMP_7,
LAST_TEMP_8,
LAST_TEMP_9,
LAST_TEMP_10,
LAST_TEMP_11,
LAST_TEMP_12,
LAST_TEMP_13,
LAST_TEMP_14,
LAST_TEMP_15,
VALID_0, /* VALID reading or not */
VALID_1,
VALID_2,
VALID_3,
VALID_4,
VALID_5,
VALID_6,
VALID_7,
VALID_8,
VALID_9,
VALID_10,
VALID_11,
VALID_12,
VALID_13,
VALID_14,
VALID_15,
LOWER_STATUS_0, /* LOWER threshold violated */
LOWER_STATUS_1,
LOWER_STATUS_2,
LOWER_STATUS_3,
LOWER_STATUS_4,
LOWER_STATUS_5,
LOWER_STATUS_6,
LOWER_STATUS_7,
LOWER_STATUS_8,
LOWER_STATUS_9,
LOWER_STATUS_10,
LOWER_STATUS_11,
LOWER_STATUS_12,
LOWER_STATUS_13,
LOWER_STATUS_14,
LOWER_STATUS_15,
LOW_INT_STATUS_0, /* LOWER interrupt status */
LOW_INT_STATUS_1,
LOW_INT_STATUS_2,
LOW_INT_STATUS_3,
LOW_INT_STATUS_4,
LOW_INT_STATUS_5,
LOW_INT_STATUS_6,
LOW_INT_STATUS_7,
LOW_INT_STATUS_8,
LOW_INT_STATUS_9,
LOW_INT_STATUS_10,
LOW_INT_STATUS_11,
LOW_INT_STATUS_12,
LOW_INT_STATUS_13,
LOW_INT_STATUS_14,
LOW_INT_STATUS_15,
LOW_INT_CLEAR_0, /* LOWER interrupt clear */
LOW_INT_CLEAR_1,
LOW_INT_CLEAR_2,
LOW_INT_CLEAR_3,
LOW_INT_CLEAR_4,
LOW_INT_CLEAR_5,
LOW_INT_CLEAR_6,
LOW_INT_CLEAR_7,
LOW_INT_CLEAR_8,
LOW_INT_CLEAR_9,
LOW_INT_CLEAR_10,
LOW_INT_CLEAR_11,
LOW_INT_CLEAR_12,
LOW_INT_CLEAR_13,
LOW_INT_CLEAR_14,
LOW_INT_CLEAR_15,
LOW_INT_MASK_0, /* LOWER interrupt mask */
LOW_INT_MASK_1,
LOW_INT_MASK_2,
LOW_INT_MASK_3,
LOW_INT_MASK_4,
LOW_INT_MASK_5,
LOW_INT_MASK_6,
LOW_INT_MASK_7,
LOW_INT_MASK_8,
LOW_INT_MASK_9,
LOW_INT_MASK_10,
LOW_INT_MASK_11,
LOW_INT_MASK_12,
LOW_INT_MASK_13,
LOW_INT_MASK_14,
LOW_INT_MASK_15,
LOW_THRESH_0, /* LOWER threshold values */
LOW_THRESH_1,
LOW_THRESH_2,
LOW_THRESH_3,
LOW_THRESH_4,
LOW_THRESH_5,
LOW_THRESH_6,
LOW_THRESH_7,
LOW_THRESH_8,
LOW_THRESH_9,
LOW_THRESH_10,
LOW_THRESH_11,
LOW_THRESH_12,
LOW_THRESH_13,
LOW_THRESH_14,
LOW_THRESH_15,
UPPER_STATUS_0, /* UPPER threshold violated */
UPPER_STATUS_1,
UPPER_STATUS_2,
UPPER_STATUS_3,
UPPER_STATUS_4,
UPPER_STATUS_5,
UPPER_STATUS_6,
UPPER_STATUS_7,
UPPER_STATUS_8,
UPPER_STATUS_9,
UPPER_STATUS_10,
UPPER_STATUS_11,
UPPER_STATUS_12,
UPPER_STATUS_13,
UPPER_STATUS_14,
UPPER_STATUS_15,
UP_INT_STATUS_0, /* UPPER interrupt status */
UP_INT_STATUS_1,
UP_INT_STATUS_2,
UP_INT_STATUS_3,
UP_INT_STATUS_4,
UP_INT_STATUS_5,
UP_INT_STATUS_6,
UP_INT_STATUS_7,
UP_INT_STATUS_8,
UP_INT_STATUS_9,
UP_INT_STATUS_10,
UP_INT_STATUS_11,
UP_INT_STATUS_12,
UP_INT_STATUS_13,
UP_INT_STATUS_14,
UP_INT_STATUS_15,
UP_INT_CLEAR_0, /* UPPER interrupt clear */
UP_INT_CLEAR_1,
UP_INT_CLEAR_2,
UP_INT_CLEAR_3,
UP_INT_CLEAR_4,
UP_INT_CLEAR_5,
UP_INT_CLEAR_6,
UP_INT_CLEAR_7,
UP_INT_CLEAR_8,
UP_INT_CLEAR_9,
UP_INT_CLEAR_10,
UP_INT_CLEAR_11,
UP_INT_CLEAR_12,
UP_INT_CLEAR_13,
UP_INT_CLEAR_14,
UP_INT_CLEAR_15,
UP_INT_MASK_0, /* UPPER interrupt mask */
UP_INT_MASK_1,
UP_INT_MASK_2,
UP_INT_MASK_3,
UP_INT_MASK_4,
UP_INT_MASK_5,
UP_INT_MASK_6,
UP_INT_MASK_7,
UP_INT_MASK_8,
UP_INT_MASK_9,
UP_INT_MASK_10,
UP_INT_MASK_11,
UP_INT_MASK_12,
UP_INT_MASK_13,
UP_INT_MASK_14,
UP_INT_MASK_15,
UP_THRESH_0, /* UPPER threshold values */
UP_THRESH_1,
UP_THRESH_2,
UP_THRESH_3,
UP_THRESH_4,
UP_THRESH_5,
UP_THRESH_6,
UP_THRESH_7,
UP_THRESH_8,
UP_THRESH_9,
UP_THRESH_10,
UP_THRESH_11,
UP_THRESH_12,
UP_THRESH_13,
UP_THRESH_14,
UP_THRESH_15,
CRITICAL_STATUS_0, /* CRITICAL threshold violated */
CRITICAL_STATUS_1,
CRITICAL_STATUS_2,
CRITICAL_STATUS_3,
CRITICAL_STATUS_4,
CRITICAL_STATUS_5,
CRITICAL_STATUS_6,
CRITICAL_STATUS_7,
CRITICAL_STATUS_8,
CRITICAL_STATUS_9,
CRITICAL_STATUS_10,
CRITICAL_STATUS_11,
CRITICAL_STATUS_12,
CRITICAL_STATUS_13,
CRITICAL_STATUS_14,
CRITICAL_STATUS_15,
CRIT_INT_STATUS_0, /* CRITICAL interrupt status */
CRIT_INT_STATUS_1,
CRIT_INT_STATUS_2,
CRIT_INT_STATUS_3,
CRIT_INT_STATUS_4,
CRIT_INT_STATUS_5,
CRIT_INT_STATUS_6,
CRIT_INT_STATUS_7,
CRIT_INT_STATUS_8,
CRIT_INT_STATUS_9,
CRIT_INT_STATUS_10,
CRIT_INT_STATUS_11,
CRIT_INT_STATUS_12,
CRIT_INT_STATUS_13,
CRIT_INT_STATUS_14,
CRIT_INT_STATUS_15,
CRIT_INT_CLEAR_0, /* CRITICAL interrupt clear */
CRIT_INT_CLEAR_1,
CRIT_INT_CLEAR_2,
CRIT_INT_CLEAR_3,
CRIT_INT_CLEAR_4,
CRIT_INT_CLEAR_5,
CRIT_INT_CLEAR_6,
CRIT_INT_CLEAR_7,
CRIT_INT_CLEAR_8,
CRIT_INT_CLEAR_9,
CRIT_INT_CLEAR_10,
CRIT_INT_CLEAR_11,
CRIT_INT_CLEAR_12,
CRIT_INT_CLEAR_13,
CRIT_INT_CLEAR_14,
CRIT_INT_CLEAR_15,
CRIT_INT_MASK_0, /* CRITICAL interrupt mask */
CRIT_INT_MASK_1,
CRIT_INT_MASK_2,
CRIT_INT_MASK_3,
CRIT_INT_MASK_4,
CRIT_INT_MASK_5,
CRIT_INT_MASK_6,
CRIT_INT_MASK_7,
CRIT_INT_MASK_8,
CRIT_INT_MASK_9,
CRIT_INT_MASK_10,
CRIT_INT_MASK_11,
CRIT_INT_MASK_12,
CRIT_INT_MASK_13,
CRIT_INT_MASK_14,
CRIT_INT_MASK_15,
CRIT_THRESH_0, /* CRITICAL threshold values */
CRIT_THRESH_1,
CRIT_THRESH_2,
CRIT_THRESH_3,
CRIT_THRESH_4,
CRIT_THRESH_5,
CRIT_THRESH_6,
CRIT_THRESH_7,
CRIT_THRESH_8,
CRIT_THRESH_9,
CRIT_THRESH_10,
CRIT_THRESH_11,
CRIT_THRESH_12,
CRIT_THRESH_13,
CRIT_THRESH_14,
CRIT_THRESH_15,
/* WATCHDOG */
WDOG_BARK_STATUS,
WDOG_BARK_CLEAR,
WDOG_BARK_MASK,
WDOG_BARK_COUNT,
/* CYCLE COMPLETION MONITOR */
CC_MON_STATUS,
CC_MON_CLEAR,
CC_MON_MASK,
MIN_STATUS_0, /* MIN threshold violated */
MIN_STATUS_1,
MIN_STATUS_2,
MIN_STATUS_3,
MIN_STATUS_4,
MIN_STATUS_5,
MIN_STATUS_6,
MIN_STATUS_7,
MIN_STATUS_8,
MIN_STATUS_9,
MIN_STATUS_10,
MIN_STATUS_11,
MIN_STATUS_12,
MIN_STATUS_13,
MIN_STATUS_14,
MIN_STATUS_15,
MAX_STATUS_0, /* MAX threshold violated */
MAX_STATUS_1,
MAX_STATUS_2,
MAX_STATUS_3,
MAX_STATUS_4,
MAX_STATUS_5,
MAX_STATUS_6,
MAX_STATUS_7,
MAX_STATUS_8,
MAX_STATUS_9,
MAX_STATUS_10,
MAX_STATUS_11,
MAX_STATUS_12,
MAX_STATUS_13,
MAX_STATUS_14,
MAX_STATUS_15,
/* Keep last */
MAX_REGFIELDS
};
/**
* struct tsens_features - Features supported by the IP
* @ver_major: Major number of IP version
* @crit_int: does the IP support critical interrupts?
* @adc: do the sensors only output adc code (instead of temperature)?
* @srot_split: does the IP neatly splits the register space into SROT and TM,
* with SROT only being available to secure boot firmware?
* @has_watchdog: does this IP support watchdog functionality?
* @max_sensors: maximum sensors supported by this version of the IP
*/
struct tsens_features {
unsigned int ver_major;
unsigned int crit_int:1;
unsigned int adc:1;
unsigned int srot_split:1;
unsigned int has_watchdog:1;
unsigned int max_sensors;
};
/**
* struct tsens_plat_data - tsens compile-time platform data
* @num_sensors: Number of sensors supported by platform
* @ops: operations the tsens instance supports
* @hw_ids: Subset of sensors ids supported by platform, if not the first n
* @feat: features of the IP
* @fields: bitfield locations
*/
struct tsens_plat_data {
const u32 num_sensors;
const struct tsens_ops *ops;
unsigned int *hw_ids;
struct tsens_features *feat;
const struct reg_field *fields;
};
/**
* struct tsens_context - Registers to be saved/restored across a context loss
* @threshold: Threshold register value
* @control: Control register value
*/
struct tsens_context {
int threshold;
int control;
};
/**
* struct tsens_priv - private data for each instance of the tsens IP
* @dev: pointer to struct device
* @num_sensors: number of sensors enabled on this device
* @tm_map: pointer to TM register address space
* @srot_map: pointer to SROT register address space
* @tm_offset: deal with old device trees that don't address TM and SROT
* address space separately
* @ul_lock: lock while processing upper/lower threshold interrupts
* @crit_lock: lock while processing critical threshold interrupts
* @rf: array of regmap_fields used to store value of the field
* @ctx: registers to be saved and restored during suspend/resume
* @feat: features of the IP
* @fields: bitfield locations
* @ops: pointer to list of callbacks supported by this device
* @debug_root: pointer to debugfs dentry for all tsens
* @debug: pointer to debugfs dentry for tsens controller
* @sensor: list of sensors attached to this device
*/
struct tsens_priv {
struct device *dev;
u32 num_sensors;
struct regmap *tm_map;
struct regmap *srot_map;
u32 tm_offset;
/* lock for upper/lower threshold interrupts */
spinlock_t ul_lock;
struct regmap_field *rf[MAX_REGFIELDS];
struct tsens_context ctx;
struct tsens_features *feat;
const struct reg_field *fields;
const struct tsens_ops *ops;
struct dentry *debug_root;
struct dentry *debug;
struct tsens_sensor sensor[];
};
char *qfprom_read(struct device *dev, const char *cname);
void compute_intercept_slope(struct tsens_priv *priv, u32 *pt1, u32 *pt2, u32 mode);
int init_common(struct tsens_priv *priv);
int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp);
int get_temp_common(const struct tsens_sensor *s, int *temp);
int tsens_enable_irq(struct tsens_priv *priv);
void tsens_disable_irq(struct tsens_priv *priv);
int tsens_set_trips(void *_sensor, int low, int high);
irqreturn_t tsens_irq_thread(int irq, void *data);
irqreturn_t tsens_critical_irq_thread(int irq, void *data);
/* TSENS target */
extern struct tsens_plat_data data_8960;
/* TSENS v0.1 targets */
extern struct tsens_plat_data data_8916, data_8974;
/* TSENS v1 targets */
extern struct tsens_plat_data data_tsens_v1, data_8976;
/* TSENS v2 targets */
extern struct tsens_plat_data data_8996, data_tsens_v2;
#endif /* __QCOM_TSENS_H__ */
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