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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2018 NXP.
*
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device_cooling.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
#include "thermal_core.h"
#define TER 0x0 /* TMU enable */
#define TSR 0x4 /* TMU status */
#define TIER 0x8 /* TMU interrupt enable */
#define TIDR 0xc /* TMU interrupt detect */
#define TMHTITR 0x10 /* TMU high immediate threshold */
#define TMHTATR 0x14 /* TMU high average threshold */
#define TMHTCATR 0x18 /* TMU high average critical threshold */
#define TSCR 0x1c /* TMU sensor val(raw, no calibration) */
#define TRITSR 0x20 /* TMU immediate temp */
#define TRATSR 0x24 /* TMU average temp */
#define TER_EN BIT(31)
#define TRITSR_VALID BIT(31)
#define TEMP_VAL_MASK 0xff
#define IMX_TEMP_PASSIVE_COOL_DELTA 10000
struct imx8mm_tmu {
struct thermal_zone_device *tzd;
struct thermal_cooling_device *cdev;
struct clk *clk;
void __iomem *tmu_base;
bool enabled;
int temp_passive;
int temp_critical;
};
/* The driver support 1 passive trip point and 1 critical trip point */
enum imx_thermal_trip {
IMX_TRIP_PASSIVE,
IMX_TRIP_CRITICAL,
IMX_TRIP_NUM,
};
static int tmu_get_temp(void *data, int *temp)
{
struct imx8mm_tmu *tmu = data;
u32 val;
/* the temp sensor need about 1ms to finish the measurement */
msleep(1);
/* read the calibrated temp value */
val = readl_relaxed(tmu->tmu_base + TRITSR);
if (!(val & TRITSR_VALID))
return -EAGAIN;
*temp = (val & TEMP_VAL_MASK) * 1000;
return 0;
}
static int tmu_get_trend(void *p, int trip, enum thermal_trend *trend)
{
int trip_temp;
struct imx8mm_tmu *tmu = p;
if (!tmu->tzd)
return 0;
trip_temp = (trip == IMX_TRIP_PASSIVE) ? tmu->temp_passive : tmu->temp_critical;
if (tmu->tzd->temperature >= (trip_temp - IMX_TEMP_PASSIVE_COOL_DELTA))
*trend = THERMAL_TREND_RAISE_FULL;
else
*trend = THERMAL_TREND_DROP_FULL;
return 0;
}
static int tmu_set_trip_temp(void *p, int trip, int temp)
{
struct imx8mm_tmu *tmu = p;
if (trip == IMX_TRIP_CRITICAL)
tmu->temp_critical = temp;
if (trip == IMX_TRIP_PASSIVE)
tmu->temp_passive = temp;
return 0;
}
static struct thermal_zone_of_device_ops tmu_tz_ops = {
.get_temp = tmu_get_temp,
.get_trend = tmu_get_trend,
.set_trip_temp = tmu_set_trip_temp,
};
static const struct of_device_id imx8mm_tmu_table[] = {
{ .compatible = "fsl,imx8mm-tmu", },
{ },
};
static int imx8mm_tmu_probe(struct platform_device *pdev)
{
int ret;
u32 val;
struct imx8mm_tmu *tmu;
const struct thermal_trip *trips;
struct device_node *np = pdev->dev.of_node;
if (!np) {
dev_err(&pdev->dev, "device node NOT found\n");
return -ENODEV;
}
tmu = devm_kzalloc(&pdev->dev, sizeof(*tmu), GFP_KERNEL);
if (!tmu)
return -ENOMEM;
platform_set_drvdata(pdev, tmu);
tmu->tmu_base = of_iomap(np, 0);
if (!tmu->tmu_base) {
dev_err(&pdev->dev, "Failed to map the memory\n");
return -ENODEV;
}
tmu->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(tmu->clk)) {
ret = PTR_ERR(tmu->clk);
dev_err(&pdev->dev, "Failed to get the tmu clk\n");
goto err;
}
/* register the thermal zone sensor */
tmu->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, tmu, &tmu_tz_ops);
if (IS_ERR(tmu->tzd)) {
ret = PTR_ERR(tmu->tzd);
dev_err(&pdev->dev, "Failed to register thermal zone sensor %d\n", ret);
goto err;
}
tmu->cdev = devfreq_cooling_register();
if (IS_ERR(tmu->cdev)) {
ret = PTR_ERR(tmu->cdev);
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "failed to register devfreq cooling device %d\n", ret);
goto err;
}
ret = thermal_zone_bind_cooling_device(tmu->tzd,
IMX_TRIP_PASSIVE,
tmu->cdev,
THERMAL_NO_LIMIT,
THERMAL_NO_LIMIT,
THERMAL_WEIGHT_DEFAULT);
if (ret) {
dev_err(&pdev->dev,
"binding zone %s with cdev %s failed:%d\n",
tmu->tzd->type, tmu->cdev->type, ret);
devfreq_cooling_unregister(tmu->cdev);
goto err;
}
trips = of_thermal_get_trip_points(tmu->tzd);
/* get the thermal trip temp */
tmu->temp_passive = trips[0].temperature;
tmu->temp_critical = trips[1].temperature;
/* enable the tmu clock */
ret = clk_prepare_enable(tmu->clk);
if (ret) {
dev_warn(&pdev->dev, "tmu clock enable failed:%d\n", ret);
thermal_zone_unbind_cooling_device(tmu->tzd, IMX_TRIP_PASSIVE, tmu->cdev);
devfreq_cooling_unregister(tmu->cdev);
goto err;
}
/* enable the monitor */
val = readl_relaxed(tmu->tmu_base + TER);
val |= TER_EN;
writel_relaxed(val, tmu->tmu_base + TER);
return 0;
err:
iounmap(tmu->tmu_base);
return ret;
}
static int imx8mm_tmu_remove(struct platform_device *pdev)
{
u32 val;
struct imx8mm_tmu *tmu = platform_get_drvdata(pdev);
thermal_zone_unbind_cooling_device(tmu->tzd, IMX_TRIP_PASSIVE, tmu->cdev);
devfreq_cooling_unregister(tmu->cdev);
/* disable TMU */
val = readl_relaxed(tmu->tmu_base + TER);
val &= ~TER_EN;
writel_relaxed(val, tmu->tmu_base + TER);
/* disable TMU clk */
clk_disable_unprepare(tmu->clk);
iounmap(tmu->tmu_base);
return 0;
}
static struct platform_driver imx8mm_tmu = {
.driver = {
.name = "i.mx8mm_thermal",
.of_match_table = imx8mm_tmu_table,
},
.probe = imx8mm_tmu_probe,
.remove = imx8mm_tmu_remove,
};
module_platform_driver(imx8mm_tmu);
MODULE_AUTHOR("Jacky Bai <ping.bai@nxp.com>");
MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver");
MODULE_LICENSE("GPL v2");
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