610 строки
14 KiB
C
610 строки
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) STMicroelectronics 2018 - All Rights Reserved
|
|
* Author: David Hernandez Sanchez <david.hernandezsanchez@st.com> for
|
|
* STMicroelectronics.
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/iopoll.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/thermal.h>
|
|
|
|
#include "../thermal_core.h"
|
|
#include "../thermal_hwmon.h"
|
|
|
|
/* DTS register offsets */
|
|
#define DTS_CFGR1_OFFSET 0x0
|
|
#define DTS_T0VALR1_OFFSET 0x8
|
|
#define DTS_RAMPVALR_OFFSET 0X10
|
|
#define DTS_ITR1_OFFSET 0x14
|
|
#define DTS_DR_OFFSET 0x1C
|
|
#define DTS_SR_OFFSET 0x20
|
|
#define DTS_ITENR_OFFSET 0x24
|
|
#define DTS_ICIFR_OFFSET 0x28
|
|
|
|
/* DTS_CFGR1 register mask definitions */
|
|
#define HSREF_CLK_DIV_MASK GENMASK(30, 24)
|
|
#define TS1_SMP_TIME_MASK GENMASK(19, 16)
|
|
#define TS1_INTRIG_SEL_MASK GENMASK(11, 8)
|
|
|
|
/* DTS_T0VALR1 register mask definitions */
|
|
#define TS1_T0_MASK GENMASK(17, 16)
|
|
#define TS1_FMT0_MASK GENMASK(15, 0)
|
|
|
|
/* DTS_RAMPVALR register mask definitions */
|
|
#define TS1_RAMP_COEFF_MASK GENMASK(15, 0)
|
|
|
|
/* DTS_ITR1 register mask definitions */
|
|
#define TS1_HITTHD_MASK GENMASK(31, 16)
|
|
#define TS1_LITTHD_MASK GENMASK(15, 0)
|
|
|
|
/* DTS_DR register mask definitions */
|
|
#define TS1_MFREQ_MASK GENMASK(15, 0)
|
|
|
|
/* DTS_ITENR register mask definitions */
|
|
#define ITENR_MASK (GENMASK(2, 0) | GENMASK(6, 4))
|
|
|
|
/* DTS_ICIFR register mask definitions */
|
|
#define ICIFR_MASK (GENMASK(2, 0) | GENMASK(6, 4))
|
|
|
|
/* Less significant bit position definitions */
|
|
#define TS1_T0_POS 16
|
|
#define TS1_HITTHD_POS 16
|
|
#define TS1_LITTHD_POS 0
|
|
#define HSREF_CLK_DIV_POS 24
|
|
|
|
/* DTS_CFGR1 bit definitions */
|
|
#define TS1_EN BIT(0)
|
|
#define TS1_START BIT(4)
|
|
#define REFCLK_SEL BIT(20)
|
|
#define REFCLK_LSE REFCLK_SEL
|
|
#define Q_MEAS_OPT BIT(21)
|
|
#define CALIBRATION_CONTROL Q_MEAS_OPT
|
|
|
|
/* DTS_SR bit definitions */
|
|
#define TS_RDY BIT(15)
|
|
/* Bit definitions below are common for DTS_SR, DTS_ITENR and DTS_CIFR */
|
|
#define HIGH_THRESHOLD BIT(2)
|
|
#define LOW_THRESHOLD BIT(1)
|
|
|
|
/* Constants */
|
|
#define ADJUST 100
|
|
#define ONE_MHZ 1000000
|
|
#define POLL_TIMEOUT 5000
|
|
#define STARTUP_TIME 40
|
|
#define TS1_T0_VAL0 30000 /* 30 celsius */
|
|
#define TS1_T0_VAL1 130000 /* 130 celsius */
|
|
#define NO_HW_TRIG 0
|
|
#define SAMPLING_TIME 15
|
|
|
|
struct stm_thermal_sensor {
|
|
struct device *dev;
|
|
struct thermal_zone_device *th_dev;
|
|
enum thermal_device_mode mode;
|
|
struct clk *clk;
|
|
unsigned int low_temp_enabled;
|
|
unsigned int high_temp_enabled;
|
|
int irq;
|
|
void __iomem *base;
|
|
int t0, fmt0, ramp_coeff;
|
|
};
|
|
|
|
static int stm_enable_irq(struct stm_thermal_sensor *sensor)
|
|
{
|
|
u32 value;
|
|
|
|
dev_dbg(sensor->dev, "low:%d high:%d\n", sensor->low_temp_enabled,
|
|
sensor->high_temp_enabled);
|
|
|
|
/* Disable IT generation for low and high thresholds */
|
|
value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET);
|
|
value &= ~(LOW_THRESHOLD | HIGH_THRESHOLD);
|
|
|
|
if (sensor->low_temp_enabled)
|
|
value |= HIGH_THRESHOLD;
|
|
|
|
if (sensor->high_temp_enabled)
|
|
value |= LOW_THRESHOLD;
|
|
|
|
/* Enable interrupts */
|
|
writel_relaxed(value, sensor->base + DTS_ITENR_OFFSET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t stm_thermal_irq_handler(int irq, void *sdata)
|
|
{
|
|
struct stm_thermal_sensor *sensor = sdata;
|
|
|
|
dev_dbg(sensor->dev, "sr:%d\n",
|
|
readl_relaxed(sensor->base + DTS_SR_OFFSET));
|
|
|
|
thermal_zone_device_update(sensor->th_dev, THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
stm_enable_irq(sensor);
|
|
|
|
/* Acknoledge all DTS irqs */
|
|
writel_relaxed(ICIFR_MASK, sensor->base + DTS_ICIFR_OFFSET);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int stm_sensor_power_on(struct stm_thermal_sensor *sensor)
|
|
{
|
|
int ret;
|
|
u32 value;
|
|
|
|
/* Enable sensor */
|
|
value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
|
|
value |= TS1_EN;
|
|
writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
|
|
|
|
/*
|
|
* The DTS block can be enabled by setting TSx_EN bit in
|
|
* DTS_CFGRx register. It requires a startup time of
|
|
* 40μs. Use 5 ms as arbitrary timeout.
|
|
*/
|
|
ret = readl_poll_timeout(sensor->base + DTS_SR_OFFSET,
|
|
value, (value & TS_RDY),
|
|
STARTUP_TIME, POLL_TIMEOUT);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Start continuous measuring */
|
|
value = readl_relaxed(sensor->base +
|
|
DTS_CFGR1_OFFSET);
|
|
value |= TS1_START;
|
|
writel_relaxed(value, sensor->base +
|
|
DTS_CFGR1_OFFSET);
|
|
|
|
sensor->mode = THERMAL_DEVICE_ENABLED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm_sensor_power_off(struct stm_thermal_sensor *sensor)
|
|
{
|
|
u32 value;
|
|
|
|
sensor->mode = THERMAL_DEVICE_DISABLED;
|
|
|
|
/* Stop measuring */
|
|
value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
|
|
value &= ~TS1_START;
|
|
writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
|
|
|
|
/* Ensure stop is taken into account */
|
|
usleep_range(STARTUP_TIME, POLL_TIMEOUT);
|
|
|
|
/* Disable sensor */
|
|
value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
|
|
value &= ~TS1_EN;
|
|
writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
|
|
|
|
/* Ensure disable is taken into account */
|
|
return readl_poll_timeout(sensor->base + DTS_SR_OFFSET, value,
|
|
!(value & TS_RDY),
|
|
STARTUP_TIME, POLL_TIMEOUT);
|
|
}
|
|
|
|
static int stm_thermal_calibration(struct stm_thermal_sensor *sensor)
|
|
{
|
|
u32 value, clk_freq;
|
|
u32 prescaler;
|
|
|
|
/* Figure out prescaler value for PCLK during calibration */
|
|
clk_freq = clk_get_rate(sensor->clk);
|
|
if (!clk_freq)
|
|
return -EINVAL;
|
|
|
|
prescaler = 0;
|
|
clk_freq /= ONE_MHZ;
|
|
if (clk_freq) {
|
|
while (prescaler <= clk_freq)
|
|
prescaler++;
|
|
}
|
|
|
|
value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
|
|
|
|
/* Clear prescaler */
|
|
value &= ~HSREF_CLK_DIV_MASK;
|
|
|
|
/* Set prescaler. pclk_freq/prescaler < 1MHz */
|
|
value |= (prescaler << HSREF_CLK_DIV_POS);
|
|
|
|
/* Select PCLK as reference clock */
|
|
value &= ~REFCLK_SEL;
|
|
|
|
/* Set maximal sampling time for better precision */
|
|
value |= TS1_SMP_TIME_MASK;
|
|
|
|
/* Measure with calibration */
|
|
value &= ~CALIBRATION_CONTROL;
|
|
|
|
/* select trigger */
|
|
value &= ~TS1_INTRIG_SEL_MASK;
|
|
value |= NO_HW_TRIG;
|
|
|
|
writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Fill in DTS structure with factory sensor values */
|
|
static int stm_thermal_read_factory_settings(struct stm_thermal_sensor *sensor)
|
|
{
|
|
/* Retrieve engineering calibration temperature */
|
|
sensor->t0 = readl_relaxed(sensor->base + DTS_T0VALR1_OFFSET) &
|
|
TS1_T0_MASK;
|
|
if (!sensor->t0)
|
|
sensor->t0 = TS1_T0_VAL0;
|
|
else
|
|
sensor->t0 = TS1_T0_VAL1;
|
|
|
|
/* Retrieve fmt0 and put it on Hz */
|
|
sensor->fmt0 = ADJUST * (readl_relaxed(sensor->base +
|
|
DTS_T0VALR1_OFFSET) & TS1_FMT0_MASK);
|
|
|
|
/* Retrieve ramp coefficient */
|
|
sensor->ramp_coeff = readl_relaxed(sensor->base + DTS_RAMPVALR_OFFSET) &
|
|
TS1_RAMP_COEFF_MASK;
|
|
|
|
if (!sensor->fmt0 || !sensor->ramp_coeff) {
|
|
dev_err(sensor->dev, "%s: wrong setting\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(sensor->dev, "%s: T0 = %doC, FMT0 = %dHz, RAMP_COEFF = %dHz/oC",
|
|
__func__, sensor->t0, sensor->fmt0, sensor->ramp_coeff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm_thermal_calculate_threshold(struct stm_thermal_sensor *sensor,
|
|
int temp, u32 *th)
|
|
{
|
|
int freqM;
|
|
|
|
/* Figure out the CLK_PTAT frequency for a given temperature */
|
|
freqM = ((temp - sensor->t0) * sensor->ramp_coeff) / 1000 +
|
|
sensor->fmt0;
|
|
|
|
/* Figure out the threshold sample number */
|
|
*th = clk_get_rate(sensor->clk) * SAMPLING_TIME / freqM;
|
|
if (!*th)
|
|
return -EINVAL;
|
|
|
|
dev_dbg(sensor->dev, "freqM=%d Hz, threshold=0x%x", freqM, *th);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Disable temperature interrupt */
|
|
static int stm_disable_irq(struct stm_thermal_sensor *sensor)
|
|
{
|
|
u32 value;
|
|
|
|
/* Disable IT generation */
|
|
value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET);
|
|
value &= ~ITENR_MASK;
|
|
writel_relaxed(value, sensor->base + DTS_ITENR_OFFSET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm_thermal_set_trips(void *data, int low, int high)
|
|
{
|
|
struct stm_thermal_sensor *sensor = data;
|
|
u32 itr1, th;
|
|
int ret;
|
|
|
|
dev_dbg(sensor->dev, "set trips %d <--> %d\n", low, high);
|
|
|
|
/* Erase threshold content */
|
|
itr1 = readl_relaxed(sensor->base + DTS_ITR1_OFFSET);
|
|
itr1 &= ~(TS1_LITTHD_MASK | TS1_HITTHD_MASK);
|
|
|
|
/*
|
|
* Disable low-temp if "low" is too small. As per thermal framework
|
|
* API, we use -INT_MAX rather than INT_MIN.
|
|
*/
|
|
|
|
if (low > -INT_MAX) {
|
|
sensor->low_temp_enabled = 1;
|
|
/* add 0.5 of hysteresis due to measurement error */
|
|
ret = stm_thermal_calculate_threshold(sensor, low - 500, &th);
|
|
if (ret)
|
|
return ret;
|
|
|
|
itr1 |= (TS1_HITTHD_MASK & (th << TS1_HITTHD_POS));
|
|
} else {
|
|
sensor->low_temp_enabled = 0;
|
|
}
|
|
|
|
/* Disable high-temp if "high" is too big. */
|
|
if (high < INT_MAX) {
|
|
sensor->high_temp_enabled = 1;
|
|
ret = stm_thermal_calculate_threshold(sensor, high, &th);
|
|
if (ret)
|
|
return ret;
|
|
|
|
itr1 |= (TS1_LITTHD_MASK & (th << TS1_LITTHD_POS));
|
|
} else {
|
|
sensor->high_temp_enabled = 0;
|
|
}
|
|
|
|
/* Write new threshod values*/
|
|
writel_relaxed(itr1, sensor->base + DTS_ITR1_OFFSET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Callback to get temperature from HW */
|
|
static int stm_thermal_get_temp(void *data, int *temp)
|
|
{
|
|
struct stm_thermal_sensor *sensor = data;
|
|
u32 periods;
|
|
int freqM, ret;
|
|
|
|
if (sensor->mode != THERMAL_DEVICE_ENABLED)
|
|
return -EAGAIN;
|
|
|
|
/* Retrieve the number of periods sampled */
|
|
ret = readl_relaxed_poll_timeout(sensor->base + DTS_DR_OFFSET, periods,
|
|
(periods & TS1_MFREQ_MASK),
|
|
STARTUP_TIME, POLL_TIMEOUT);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Figure out the CLK_PTAT frequency */
|
|
freqM = (clk_get_rate(sensor->clk) * SAMPLING_TIME) / periods;
|
|
if (!freqM)
|
|
return -EINVAL;
|
|
|
|
/* Figure out the temperature in mili celsius */
|
|
*temp = (freqM - sensor->fmt0) * 1000 / sensor->ramp_coeff + sensor->t0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Registers DTS irq to be visible by GIC */
|
|
static int stm_register_irq(struct stm_thermal_sensor *sensor)
|
|
{
|
|
struct device *dev = sensor->dev;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int ret;
|
|
|
|
sensor->irq = platform_get_irq(pdev, 0);
|
|
if (sensor->irq < 0)
|
|
return sensor->irq;
|
|
|
|
ret = devm_request_threaded_irq(dev, sensor->irq,
|
|
NULL,
|
|
stm_thermal_irq_handler,
|
|
IRQF_ONESHOT,
|
|
dev->driver->name, sensor);
|
|
if (ret) {
|
|
dev_err(dev, "%s: Failed to register IRQ %d\n", __func__,
|
|
sensor->irq);
|
|
return ret;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: thermal IRQ registered", __func__);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm_thermal_sensor_off(struct stm_thermal_sensor *sensor)
|
|
{
|
|
int ret;
|
|
|
|
stm_disable_irq(sensor);
|
|
|
|
ret = stm_sensor_power_off(sensor);
|
|
if (ret)
|
|
return ret;
|
|
|
|
clk_disable_unprepare(sensor->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm_thermal_prepare(struct stm_thermal_sensor *sensor)
|
|
{
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(sensor->clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = stm_thermal_read_factory_settings(sensor);
|
|
if (ret)
|
|
goto thermal_unprepare;
|
|
|
|
ret = stm_thermal_calibration(sensor);
|
|
if (ret)
|
|
goto thermal_unprepare;
|
|
|
|
return 0;
|
|
|
|
thermal_unprepare:
|
|
clk_disable_unprepare(sensor->clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int stm_thermal_suspend(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct stm_thermal_sensor *sensor = dev_get_drvdata(dev);
|
|
|
|
ret = stm_thermal_sensor_off(sensor);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm_thermal_resume(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct stm_thermal_sensor *sensor = dev_get_drvdata(dev);
|
|
|
|
ret = stm_thermal_prepare(sensor);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = stm_sensor_power_on(sensor);
|
|
if (ret)
|
|
return ret;
|
|
|
|
thermal_zone_device_update(sensor->th_dev, THERMAL_EVENT_UNSPECIFIED);
|
|
stm_enable_irq(sensor);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static SIMPLE_DEV_PM_OPS(stm_thermal_pm_ops,
|
|
stm_thermal_suspend, stm_thermal_resume);
|
|
|
|
static const struct thermal_zone_of_device_ops stm_tz_ops = {
|
|
.get_temp = stm_thermal_get_temp,
|
|
.set_trips = stm_thermal_set_trips,
|
|
};
|
|
|
|
static const struct of_device_id stm_thermal_of_match[] = {
|
|
{ .compatible = "st,stm32-thermal"},
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, stm_thermal_of_match);
|
|
|
|
static int stm_thermal_probe(struct platform_device *pdev)
|
|
{
|
|
struct stm_thermal_sensor *sensor;
|
|
struct resource *res;
|
|
void __iomem *base;
|
|
int ret;
|
|
|
|
if (!pdev->dev.of_node) {
|
|
dev_err(&pdev->dev, "%s: device tree node not found\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
|
|
if (!sensor)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, sensor);
|
|
|
|
sensor->dev = &pdev->dev;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
/* Populate sensor */
|
|
sensor->base = base;
|
|
|
|
sensor->clk = devm_clk_get(&pdev->dev, "pclk");
|
|
if (IS_ERR(sensor->clk)) {
|
|
dev_err(&pdev->dev, "%s: failed to fetch PCLK clock\n",
|
|
__func__);
|
|
return PTR_ERR(sensor->clk);
|
|
}
|
|
|
|
stm_disable_irq(sensor);
|
|
|
|
/* Clear irq flags */
|
|
writel_relaxed(ICIFR_MASK, sensor->base + DTS_ICIFR_OFFSET);
|
|
|
|
/* Configure and enable HW sensor */
|
|
ret = stm_thermal_prepare(sensor);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Error prepare sensor: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = stm_sensor_power_on(sensor);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Error power on sensor: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
sensor->th_dev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
|
|
sensor,
|
|
&stm_tz_ops);
|
|
|
|
if (IS_ERR(sensor->th_dev)) {
|
|
dev_err(&pdev->dev, "%s: thermal zone sensor registering KO\n",
|
|
__func__);
|
|
ret = PTR_ERR(sensor->th_dev);
|
|
return ret;
|
|
}
|
|
|
|
/* Register IRQ into GIC */
|
|
ret = stm_register_irq(sensor);
|
|
if (ret)
|
|
goto err_tz;
|
|
|
|
stm_enable_irq(sensor);
|
|
|
|
/*
|
|
* Thermal_zone doesn't enable hwmon as default,
|
|
* enable it here
|
|
*/
|
|
sensor->th_dev->tzp->no_hwmon = false;
|
|
ret = thermal_add_hwmon_sysfs(sensor->th_dev);
|
|
if (ret)
|
|
goto err_tz;
|
|
|
|
dev_info(&pdev->dev, "%s: Driver initialized successfully\n",
|
|
__func__);
|
|
|
|
return 0;
|
|
|
|
err_tz:
|
|
thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int stm_thermal_remove(struct platform_device *pdev)
|
|
{
|
|
struct stm_thermal_sensor *sensor = platform_get_drvdata(pdev);
|
|
|
|
stm_thermal_sensor_off(sensor);
|
|
thermal_remove_hwmon_sysfs(sensor->th_dev);
|
|
thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver stm_thermal_driver = {
|
|
.driver = {
|
|
.name = "stm_thermal",
|
|
.pm = &stm_thermal_pm_ops,
|
|
.of_match_table = stm_thermal_of_match,
|
|
},
|
|
.probe = stm_thermal_probe,
|
|
.remove = stm_thermal_remove,
|
|
};
|
|
module_platform_driver(stm_thermal_driver);
|
|
|
|
MODULE_DESCRIPTION("STMicroelectronics STM32 Thermal Sensor Driver");
|
|
MODULE_AUTHOR("David Hernandez Sanchez <david.hernandezsanchez@st.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:stm_thermal");
|