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https://github.com/torvalds/linux
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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
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/*
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* Copyright 2020 NXP.
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*
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* Author: Anson Huang <Anson.Huang@nxp.com>
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#include "thermal_core.h"
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#define TER 0x0 /* TMU enable */
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#define TRITSR 0x20 /* TMU immediate temp */
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#define TER_EN BIT(31)
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#define TRITSR_VAL_MASK 0xff
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#define TEMP_LOW_LIMIT 10
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struct imx8mm_tmu {
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struct thermal_zone_device *tzd;
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void __iomem *base;
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struct clk *clk;
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};
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static int tmu_get_temp(void *data, int *temp)
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{
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struct imx8mm_tmu *tmu = data;
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u32 val;
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val = readl_relaxed(tmu->base + TRITSR) & TRITSR_VAL_MASK;
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if (val < TEMP_LOW_LIMIT)
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return -EAGAIN;
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*temp = val * 1000;
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return 0;
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}
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static struct thermal_zone_of_device_ops tmu_tz_ops = {
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.get_temp = tmu_get_temp,
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};
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static int imx8mm_tmu_probe(struct platform_device *pdev)
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{
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struct imx8mm_tmu *tmu;
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u32 val;
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int ret;
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tmu = devm_kzalloc(&pdev->dev, sizeof(struct imx8mm_tmu), GFP_KERNEL);
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if (!tmu)
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return -ENOMEM;
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tmu->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(tmu->base))
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return PTR_ERR(tmu->base);
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tmu->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(tmu->clk)) {
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ret = PTR_ERR(tmu->clk);
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"failed to get tmu clock: %d\n", ret);
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return ret;
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}
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ret = clk_prepare_enable(tmu->clk);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret);
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return ret;
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}
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tmu->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
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tmu, &tmu_tz_ops);
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if (IS_ERR(tmu->tzd)) {
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dev_err(&pdev->dev,
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"failed to register thermal zone sensor: %d\n", ret);
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return PTR_ERR(tmu->tzd);
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}
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platform_set_drvdata(pdev, tmu);
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/* enable the monitor */
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val = readl_relaxed(tmu->base + TER);
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val |= TER_EN;
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writel_relaxed(val, tmu->base + TER);
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return 0;
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}
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static int imx8mm_tmu_remove(struct platform_device *pdev)
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{
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struct imx8mm_tmu *tmu = platform_get_drvdata(pdev);
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u32 val;
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/* disable TMU */
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val = readl_relaxed(tmu->base + TER);
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val &= ~TER_EN;
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writel_relaxed(val, tmu->base + TER);
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clk_disable_unprepare(tmu->clk);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static const struct of_device_id imx8mm_tmu_table[] = {
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{ .compatible = "fsl,imx8mm-tmu", },
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{ },
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};
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static struct platform_driver imx8mm_tmu = {
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.driver = {
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.name = "i.mx8mm_thermal",
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.of_match_table = imx8mm_tmu_table,
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},
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.probe = imx8mm_tmu_probe,
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.remove = imx8mm_tmu_remove,
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};
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module_platform_driver(imx8mm_tmu);
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MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
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MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver");
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MODULE_LICENSE("GPL v2");
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