--- /dev/null
+// 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");
projects / linux.git / commitdiff