383 lines
14 KiB
C
383 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* OMAP4 Bandgap temperature sensor driver
|
|
*
|
|
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Contact:
|
|
* Eduardo Valentin <eduardo.valentin@ti.com>
|
|
*/
|
|
#ifndef __TI_BANDGAP_H
|
|
#define __TI_BANDGAP_H
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/types.h>
|
|
#include <linux/err.h>
|
|
#include <linux/cpu_pm.h>
|
|
#include <linux/device.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/pm.h>
|
|
|
|
struct gpio_desc;
|
|
|
|
/**
|
|
* DOC: bandgap driver data structure
|
|
* ==================================
|
|
*
|
|
* +----------+----------------+
|
|
* | struct temp_sensor_regval |
|
|
* +---------------------------+
|
|
* * (Array of)
|
|
* |
|
|
* |
|
|
* +-------------------+ +-----------------+
|
|
* | struct ti_bandgap |-->| struct device * |
|
|
* +----------+--------+ +-----------------+
|
|
* |
|
|
* |
|
|
* V
|
|
* +------------------------+
|
|
* | struct ti_bandgap_data |
|
|
* +------------------------+
|
|
* |
|
|
* |
|
|
* * (Array of)
|
|
* +------------+------------------------------------------------------+
|
|
* | +----------+------------+ +-------------------------+ |
|
|
* | | struct ti_temp_sensor |-->| struct temp_sensor_data | |
|
|
* | +-----------------------+ +------------+------------+ |
|
|
* | | |
|
|
* | + |
|
|
* | V |
|
|
* | +----------+-------------------+ |
|
|
* | | struct temp_sensor_registers | |
|
|
* | +------------------------------+ |
|
|
* | |
|
|
* +-------------------------------------------------------------------+
|
|
*
|
|
* Above is a simple diagram describing how the data structure below
|
|
* are organized. For each bandgap device there should be a ti_bandgap_data
|
|
* containing the device instance configuration, as well as, an array of
|
|
* sensors, representing every sensor instance present in this bandgap.
|
|
*/
|
|
|
|
/**
|
|
* struct temp_sensor_registers - descriptor to access registers and bitfields
|
|
* @temp_sensor_ctrl: TEMP_SENSOR_CTRL register offset
|
|
* @bgap_tempsoff_mask: mask to temp_sensor_ctrl.tempsoff
|
|
* @bgap_soc_mask: mask to temp_sensor_ctrl.soc
|
|
* @bgap_eocz_mask: mask to temp_sensor_ctrl.eocz
|
|
* @bgap_dtemp_mask: mask to temp_sensor_ctrl.dtemp
|
|
* @bgap_mask_ctrl: BANDGAP_MASK_CTRL register offset
|
|
* @mask_hot_mask: mask to bandgap_mask_ctrl.mask_hot
|
|
* @mask_cold_mask: mask to bandgap_mask_ctrl.mask_cold
|
|
* @mask_counter_delay_mask: mask to bandgap_mask_ctrl.mask_counter_delay
|
|
* @mask_freeze_mask: mask to bandgap_mask_ctrl.mask_free
|
|
* @bgap_mode_ctrl: BANDGAP_MODE_CTRL register offset
|
|
* @mode_ctrl_mask: mask to bandgap_mode_ctrl.mode_ctrl
|
|
* @bgap_counter: BANDGAP_COUNTER register offset
|
|
* @counter_mask: mask to bandgap_counter.counter
|
|
* @bgap_threshold: BANDGAP_THRESHOLD register offset (TALERT thresholds)
|
|
* @threshold_thot_mask: mask to bandgap_threhold.thot
|
|
* @threshold_tcold_mask: mask to bandgap_threhold.tcold
|
|
* @tshut_threshold: TSHUT_THRESHOLD register offset (TSHUT thresholds)
|
|
* @tshut_hot_mask: mask to tshut_threhold.thot
|
|
* @tshut_cold_mask: mask to tshut_threhold.thot
|
|
* @bgap_status: BANDGAP_STATUS register offset
|
|
* @status_hot_mask: mask to bandgap_status.hot
|
|
* @status_cold_mask: mask to bandgap_status.cold
|
|
* @ctrl_dtemp_1: CTRL_DTEMP1 register offset
|
|
* @ctrl_dtemp_2: CTRL_DTEMP2 register offset
|
|
* @bgap_efuse: BANDGAP_EFUSE register offset
|
|
*
|
|
* The register offsets and bitfields might change across
|
|
* OMAP and variants versions. Hence this struct serves as a
|
|
* descriptor map on how to access the registers and the bitfields.
|
|
*
|
|
* This descriptor contains registers of all versions of bandgap chips.
|
|
* Not all versions will use all registers, depending on the available
|
|
* features. Please read TRMs for descriptive explanation on each bitfield.
|
|
*/
|
|
|
|
struct temp_sensor_registers {
|
|
u32 temp_sensor_ctrl;
|
|
u32 bgap_tempsoff_mask;
|
|
u32 bgap_soc_mask;
|
|
u32 bgap_eocz_mask;
|
|
u32 bgap_dtemp_mask;
|
|
|
|
u32 bgap_mask_ctrl;
|
|
u32 mask_hot_mask;
|
|
u32 mask_cold_mask;
|
|
u32 mask_counter_delay_mask;
|
|
u32 mask_freeze_mask;
|
|
|
|
u32 bgap_mode_ctrl;
|
|
u32 mode_ctrl_mask;
|
|
|
|
u32 bgap_counter;
|
|
u32 counter_mask;
|
|
|
|
u32 bgap_threshold;
|
|
u32 threshold_thot_mask;
|
|
u32 threshold_tcold_mask;
|
|
|
|
u32 tshut_threshold;
|
|
u32 tshut_hot_mask;
|
|
u32 tshut_cold_mask;
|
|
|
|
u32 bgap_status;
|
|
u32 status_hot_mask;
|
|
u32 status_cold_mask;
|
|
|
|
u32 ctrl_dtemp_1;
|
|
u32 ctrl_dtemp_2;
|
|
u32 bgap_efuse;
|
|
};
|
|
|
|
/**
|
|
* struct temp_sensor_data - The thresholds and limits for temperature sensors.
|
|
* @tshut_hot: temperature to trigger a thermal reset (initial value)
|
|
* @tshut_cold: temp to get the plat out of reset due to thermal (init val)
|
|
* @t_hot: temperature to trigger a thermal alert (high initial value)
|
|
* @t_cold: temperature to trigger a thermal alert (low initial value)
|
|
* @min_freq: sensor minimum clock rate
|
|
* @max_freq: sensor maximum clock rate
|
|
*
|
|
* This data structure will hold the required thresholds and temperature limits
|
|
* for a specific temperature sensor, like shutdown temperature, alert
|
|
* temperature, clock / rate used, ADC conversion limits and update intervals
|
|
*/
|
|
struct temp_sensor_data {
|
|
u32 tshut_hot;
|
|
u32 tshut_cold;
|
|
u32 t_hot;
|
|
u32 t_cold;
|
|
u32 min_freq;
|
|
u32 max_freq;
|
|
};
|
|
|
|
struct ti_bandgap_data;
|
|
|
|
/**
|
|
* struct temp_sensor_regval - temperature sensor register values and priv data
|
|
* @bg_mode_ctrl: temp sensor control register value
|
|
* @bg_ctrl: bandgap ctrl register value
|
|
* @bg_counter: bandgap counter value
|
|
* @bg_threshold: bandgap threshold register value
|
|
* @tshut_threshold: bandgap tshut register value
|
|
* @data: private data
|
|
*
|
|
* Data structure to save and restore bandgap register set context. Only
|
|
* required registers are shadowed, when needed.
|
|
*/
|
|
struct temp_sensor_regval {
|
|
u32 bg_mode_ctrl;
|
|
u32 bg_ctrl;
|
|
u32 bg_counter;
|
|
u32 bg_threshold;
|
|
u32 tshut_threshold;
|
|
void *data;
|
|
};
|
|
|
|
/**
|
|
* struct ti_bandgap - bandgap device structure
|
|
* @dev: struct device pointer
|
|
* @base: io memory base address
|
|
* @conf: struct with bandgap configuration set (# sensors, conv_table, etc)
|
|
* @regval: temperature sensor register values
|
|
* @fclock: pointer to functional clock of temperature sensor
|
|
* @div_clk: pointer to divider clock of temperature sensor fclk
|
|
* @lock: spinlock for ti_bandgap structure
|
|
* @irq: MPU IRQ number for thermal alert
|
|
* @tshut_gpio: GPIO where Tshut signal is routed
|
|
* @clk_rate: Holds current clock rate
|
|
*
|
|
* The bandgap device structure representing the bandgap device instance.
|
|
* It holds most of the dynamic stuff. Configurations and sensor specific
|
|
* entries are inside the @conf structure.
|
|
*/
|
|
struct ti_bandgap {
|
|
struct device *dev;
|
|
void __iomem *base;
|
|
const struct ti_bandgap_data *conf;
|
|
struct temp_sensor_regval *regval;
|
|
struct clk *fclock;
|
|
struct clk *div_clk;
|
|
spinlock_t lock; /* shields this struct */
|
|
int irq;
|
|
struct gpio_desc *tshut_gpiod;
|
|
u32 clk_rate;
|
|
struct notifier_block nb;
|
|
unsigned int is_suspended:1;
|
|
};
|
|
|
|
/**
|
|
* struct ti_temp_sensor - bandgap temperature sensor configuration data
|
|
* @ts_data: pointer to struct with thresholds, limits of temperature sensor
|
|
* @registers: pointer to the list of register offsets and bitfields
|
|
* @domain: the name of the domain where the sensor is located
|
|
* @slope_pcb: sensor gradient slope info for hotspot extrapolation equation
|
|
* with no external influence
|
|
* @constant_pcb: sensor gradient const info for hotspot extrapolation equation
|
|
* with no external influence
|
|
* @register_cooling: function to describe how this sensor is going to be cooled
|
|
* @unregister_cooling: function to release cooling data
|
|
*
|
|
* Data structure to describe a temperature sensor handled by a bandgap device.
|
|
* It should provide configuration details on this sensor, such as how to
|
|
* access the registers affecting this sensor, shadow register buffer, how to
|
|
* assess the gradient from hotspot, how to cooldown the domain when sensor
|
|
* reports too hot temperature.
|
|
*/
|
|
struct ti_temp_sensor {
|
|
struct temp_sensor_data *ts_data;
|
|
struct temp_sensor_registers *registers;
|
|
char *domain;
|
|
/* for hotspot extrapolation */
|
|
const int slope_pcb;
|
|
const int constant_pcb;
|
|
int (*register_cooling)(struct ti_bandgap *bgp, int id);
|
|
int (*unregister_cooling)(struct ti_bandgap *bgp, int id);
|
|
};
|
|
|
|
/**
|
|
* DOC: ti bandgap feature types
|
|
*
|
|
* TI_BANDGAP_FEATURE_TSHUT - used when the thermal shutdown signal output
|
|
* of a bandgap device instance is routed to the processor. This means
|
|
* the system must react and perform the shutdown by itself (handle an
|
|
* IRQ, for instance).
|
|
*
|
|
* TI_BANDGAP_FEATURE_TSHUT_CONFIG - used when the bandgap device has control
|
|
* over the thermal shutdown configuration. This means that the thermal
|
|
* shutdown thresholds are programmable, for instance.
|
|
*
|
|
* TI_BANDGAP_FEATURE_TALERT - used when the bandgap device instance outputs
|
|
* a signal representing violation of programmable alert thresholds.
|
|
*
|
|
* TI_BANDGAP_FEATURE_MODE_CONFIG - used when it is possible to choose which
|
|
* mode, continuous or one shot, the bandgap device instance will operate.
|
|
*
|
|
* TI_BANDGAP_FEATURE_COUNTER - used when the bandgap device instance allows
|
|
* programming the update interval of its internal state machine.
|
|
*
|
|
* TI_BANDGAP_FEATURE_POWER_SWITCH - used when the bandgap device allows
|
|
* itself to be switched on/off.
|
|
*
|
|
* TI_BANDGAP_FEATURE_CLK_CTRL - used when the clocks feeding the bandgap
|
|
* device are gateable or not.
|
|
*
|
|
* TI_BANDGAP_FEATURE_FREEZE_BIT - used when the bandgap device features
|
|
* a history buffer that its update can be freezed/unfreezed.
|
|
*
|
|
* TI_BANDGAP_FEATURE_COUNTER_DELAY - used when the bandgap device features
|
|
* a delay programming based on distinct values.
|
|
*
|
|
* TI_BANDGAP_FEATURE_HISTORY_BUFFER - used when the bandgap device features
|
|
* a history buffer of temperatures.
|
|
*
|
|
* TI_BANDGAP_FEATURE_ERRATA_814 - used to workaorund when the bandgap device
|
|
* has Errata 814
|
|
* TI_BANDGAP_FEATURE_UNRELIABLE - used when the sensor readings are too
|
|
* inaccurate.
|
|
* TI_BANDGAP_FEATURE_CONT_MODE_ONLY - used when single mode hangs the sensor
|
|
* TI_BANDGAP_HAS(b, f) - macro to check if a bandgap device is capable of a
|
|
* specific feature (above) or not. Return non-zero, if yes.
|
|
*/
|
|
#define TI_BANDGAP_FEATURE_TSHUT BIT(0)
|
|
#define TI_BANDGAP_FEATURE_TSHUT_CONFIG BIT(1)
|
|
#define TI_BANDGAP_FEATURE_TALERT BIT(2)
|
|
#define TI_BANDGAP_FEATURE_MODE_CONFIG BIT(3)
|
|
#define TI_BANDGAP_FEATURE_COUNTER BIT(4)
|
|
#define TI_BANDGAP_FEATURE_POWER_SWITCH BIT(5)
|
|
#define TI_BANDGAP_FEATURE_CLK_CTRL BIT(6)
|
|
#define TI_BANDGAP_FEATURE_FREEZE_BIT BIT(7)
|
|
#define TI_BANDGAP_FEATURE_COUNTER_DELAY BIT(8)
|
|
#define TI_BANDGAP_FEATURE_HISTORY_BUFFER BIT(9)
|
|
#define TI_BANDGAP_FEATURE_ERRATA_814 BIT(10)
|
|
#define TI_BANDGAP_FEATURE_UNRELIABLE BIT(11)
|
|
#define TI_BANDGAP_FEATURE_CONT_MODE_ONLY BIT(12)
|
|
#define TI_BANDGAP_HAS(b, f) \
|
|
((b)->conf->features & TI_BANDGAP_FEATURE_ ## f)
|
|
|
|
/**
|
|
* struct ti_bandgap_data - ti bandgap data configuration structure
|
|
* @features: a bitwise flag set to describe the device features
|
|
* @conv_table: Pointer to ADC to temperature conversion table
|
|
* @adc_start_val: ADC conversion table starting value
|
|
* @adc_end_val: ADC conversion table ending value
|
|
* @fclock_name: clock name of the functional clock
|
|
* @div_ck_name: clock name of the clock divisor
|
|
* @sensor_count: count of temperature sensor within this bandgap device
|
|
* @report_temperature: callback to report thermal alert to thermal API
|
|
* @expose_sensor: callback to export sensor to thermal API
|
|
* @remove_sensor: callback to destroy sensor from thermal API
|
|
* @sensors: array of sensors present in this bandgap instance
|
|
*
|
|
* This is a data structure which should hold most of the static configuration
|
|
* of a bandgap device instance. It should describe which features this instance
|
|
* is capable of, the clock names to feed this device, the amount of sensors and
|
|
* their configuration representation, and how to export and unexport them to
|
|
* a thermal API.
|
|
*/
|
|
struct ti_bandgap_data {
|
|
unsigned int features;
|
|
const int *conv_table;
|
|
u32 adc_start_val;
|
|
u32 adc_end_val;
|
|
char *fclock_name;
|
|
char *div_ck_name;
|
|
int sensor_count;
|
|
int (*report_temperature)(struct ti_bandgap *bgp, int id);
|
|
int (*expose_sensor)(struct ti_bandgap *bgp, int id, char *domain);
|
|
int (*remove_sensor)(struct ti_bandgap *bgp, int id);
|
|
|
|
/* this needs to be at the end */
|
|
struct ti_temp_sensor sensors[];
|
|
};
|
|
|
|
int ti_bandgap_read_thot(struct ti_bandgap *bgp, int id, int *thot);
|
|
int ti_bandgap_write_thot(struct ti_bandgap *bgp, int id, int val);
|
|
int ti_bandgap_read_tcold(struct ti_bandgap *bgp, int id, int *tcold);
|
|
int ti_bandgap_write_tcold(struct ti_bandgap *bgp, int id, int val);
|
|
int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id,
|
|
int *interval);
|
|
int ti_bandgap_write_update_interval(struct ti_bandgap *bgp, int id,
|
|
u32 interval);
|
|
int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id,
|
|
int *temperature);
|
|
int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data);
|
|
void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id);
|
|
int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend);
|
|
|
|
#ifdef CONFIG_OMAP3_THERMAL
|
|
extern const struct ti_bandgap_data omap34xx_data;
|
|
extern const struct ti_bandgap_data omap36xx_data;
|
|
#else
|
|
#define omap34xx_data NULL
|
|
#define omap36xx_data NULL
|
|
#endif
|
|
|
|
#ifdef CONFIG_OMAP4_THERMAL
|
|
extern const struct ti_bandgap_data omap4430_data;
|
|
extern const struct ti_bandgap_data omap4460_data;
|
|
extern const struct ti_bandgap_data omap4470_data;
|
|
#else
|
|
#define omap4430_data NULL
|
|
#define omap4460_data NULL
|
|
#define omap4470_data NULL
|
|
#endif
|
|
|
|
#ifdef CONFIG_OMAP5_THERMAL
|
|
extern const struct ti_bandgap_data omap5430_data;
|
|
#else
|
|
#define omap5430_data NULL
|
|
#endif
|
|
|
|
#ifdef CONFIG_DRA752_THERMAL
|
|
extern const struct ti_bandgap_data dra752_data;
|
|
#else
|
|
#define dra752_data NULL
|
|
#endif
|
|
#endif
|