mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-10 07:00:48 +00:00
5eed800a68
i.MX8MM has a thermal monitoring unit(TMU) inside, it ONLY has one sensor for CPU, add support for reading immediate temperature of this sensor. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/1582947862-11073-2-git-send-email-Anson.Huang@nxp.com
132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright 2020 NXP.
|
|
*
|
|
* Author: Anson Huang <Anson.Huang@nxp.com>
|
|
*/
|
|
|
|
#include <linux/clk.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 TRITSR 0x20 /* TMU immediate temp */
|
|
|
|
#define TER_EN BIT(31)
|
|
#define TRITSR_VAL_MASK 0xff
|
|
|
|
#define TEMP_LOW_LIMIT 10
|
|
|
|
struct imx8mm_tmu {
|
|
struct thermal_zone_device *tzd;
|
|
void __iomem *base;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static int tmu_get_temp(void *data, int *temp)
|
|
{
|
|
struct imx8mm_tmu *tmu = data;
|
|
u32 val;
|
|
|
|
val = readl_relaxed(tmu->base + TRITSR) & TRITSR_VAL_MASK;
|
|
if (val < TEMP_LOW_LIMIT)
|
|
return -EAGAIN;
|
|
|
|
*temp = val * 1000;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct thermal_zone_of_device_ops tmu_tz_ops = {
|
|
.get_temp = tmu_get_temp,
|
|
};
|
|
|
|
static int imx8mm_tmu_probe(struct platform_device *pdev)
|
|
{
|
|
struct imx8mm_tmu *tmu;
|
|
u32 val;
|
|
int ret;
|
|
|
|
tmu = devm_kzalloc(&pdev->dev, sizeof(struct imx8mm_tmu), GFP_KERNEL);
|
|
if (!tmu)
|
|
return -ENOMEM;
|
|
|
|
tmu->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(tmu->base))
|
|
return PTR_ERR(tmu->base);
|
|
|
|
tmu->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(tmu->clk)) {
|
|
ret = PTR_ERR(tmu->clk);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev,
|
|
"failed to get tmu clock: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = clk_prepare_enable(tmu->clk);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
tmu->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
|
|
tmu, &tmu_tz_ops);
|
|
if (IS_ERR(tmu->tzd)) {
|
|
dev_err(&pdev->dev,
|
|
"failed to register thermal zone sensor: %d\n", ret);
|
|
return PTR_ERR(tmu->tzd);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, tmu);
|
|
|
|
/* enable the monitor */
|
|
val = readl_relaxed(tmu->base + TER);
|
|
val |= TER_EN;
|
|
writel_relaxed(val, tmu->base + TER);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx8mm_tmu_remove(struct platform_device *pdev)
|
|
{
|
|
struct imx8mm_tmu *tmu = platform_get_drvdata(pdev);
|
|
u32 val;
|
|
|
|
/* disable TMU */
|
|
val = readl_relaxed(tmu->base + TER);
|
|
val &= ~TER_EN;
|
|
writel_relaxed(val, tmu->base + TER);
|
|
|
|
clk_disable_unprepare(tmu->clk);
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id imx8mm_tmu_table[] = {
|
|
{ .compatible = "fsl,imx8mm-tmu", },
|
|
{ },
|
|
};
|
|
|
|
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("Anson Huang <Anson.Huang@nxp.com>");
|
|
MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver");
|
|
MODULE_LICENSE("GPL v2");
|