// SPDX-License-Identifier: GPL-2.0-only /* * HiSilicon thermal sensor driver * * Copyright (c) 2014-2015 HiSilicon Limited. * Copyright (c) 2014-2015 Linaro Limited. * * Xinwei Kong <[email protected]> * Leo Yan <[email protected]> */ #include <linux/cpufreq.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/thermal.h> #define HI6220_TEMP0_LAG … #define HI6220_TEMP0_TH … #define HI6220_TEMP0_RST_TH … #define HI6220_TEMP0_CFG … #define HI6220_TEMP0_CFG_SS_MSK … #define HI6220_TEMP0_CFG_HDAK_MSK … #define HI6220_TEMP0_EN … #define HI6220_TEMP0_INT_EN … #define HI6220_TEMP0_INT_CLR … #define HI6220_TEMP0_RST_MSK … #define HI6220_TEMP0_VALUE … #define HI3660_OFFSET(chan) … #define HI3660_TEMP(chan) … #define HI3660_TH(chan) … #define HI3660_LAG(chan) … #define HI3660_INT_EN(chan) … #define HI3660_INT_CLR(chan) … #define HI6220_TEMP_BASE … #define HI6220_TEMP_RESET … #define HI6220_TEMP_STEP … #define HI6220_TEMP_LAG … #define HI3660_TEMP_BASE … #define HI3660_TEMP_STEP … #define HI3660_TEMP_LAG … #define HI6220_CLUSTER0_SENSOR … #define HI6220_CLUSTER1_SENSOR … #define HI3660_LITTLE_SENSOR … #define HI3660_BIG_SENSOR … #define HI3660_G3D_SENSOR … #define HI3660_MODEM_SENSOR … struct hisi_thermal_data; struct hisi_thermal_sensor { … }; struct hisi_thermal_ops { … }; struct hisi_thermal_data { … }; /* * The temperature computation on the tsensor is as follow: * Unit: millidegree Celsius * Step: 200/255 (0.7843) * Temperature base: -60°C * * The register is programmed in temperature steps, every step is 785 * millidegree and begins at -60 000 m°C * * The temperature from the steps: * * Temp = TempBase + (steps x 785) * * and the steps from the temperature: * * steps = (Temp - TempBase) / 785 * */ static inline int hi6220_thermal_step_to_temp(int step) { … } static inline int hi6220_thermal_temp_to_step(int temp) { … } /* * for Hi3660, * Step: 189/922 (0.205) * Temperature base: -63.780°C * * The register is programmed in temperature steps, every step is 205 * millidegree and begins at -63 780 m°C */ static inline int hi3660_thermal_step_to_temp(int step) { … } static inline int hi3660_thermal_temp_to_step(int temp) { … } /* * The lag register contains 5 bits encoding the temperature in steps. * * Each time the temperature crosses the threshold boundary, an * interrupt is raised. It could be when the temperature is going * above the threshold or below. However, if the temperature is * fluctuating around this value due to the load, we can receive * several interrupts which may not desired. * * We can setup a temperature representing the delta between the * threshold and the current temperature when the temperature is * decreasing. * * For instance: the lag register is 5°C, the threshold is 65°C, when * the temperature reaches 65°C an interrupt is raised and when the * temperature decrease to 65°C - 5°C another interrupt is raised. * * A very short lag can lead to an interrupt storm, a long lag * increase the latency to react to the temperature changes. In our * case, that is not really a problem as we are polling the * temperature. * * [0:4] : lag register * * The temperature is coded in steps, cf. HI6220_TEMP_STEP. * * Min : 0x00 : 0.0 °C * Max : 0x1F : 24.3 °C * * The 'value' parameter is in milliCelsius. */ static inline void hi6220_thermal_set_lag(void __iomem *addr, int value) { … } static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value) { … } static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value) { … } static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp) { … } static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp) { … } static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value) { … } static inline void hi6220_thermal_enable(void __iomem *addr, int value) { … } static inline int hi6220_thermal_get_temperature(void __iomem *addr) { … } /* * [0:6] lag register * * The temperature is coded in steps, cf. HI3660_TEMP_STEP. * * Min : 0x00 : 0.0 °C * Max : 0x7F : 26.0 °C * */ static inline void hi3660_thermal_set_lag(void __iomem *addr, int id, int value) { … } static inline void hi3660_thermal_alarm_clear(void __iomem *addr, int id, int value) { … } static inline void hi3660_thermal_alarm_enable(void __iomem *addr, int id, int value) { … } static inline void hi3660_thermal_alarm_set(void __iomem *addr, int id, int value) { … } static inline int hi3660_thermal_get_temperature(void __iomem *addr, int id) { … } /* * Temperature configuration register - Sensor selection * * Bits [19:12] * * 0x0: local sensor (default) * 0x1: remote sensor 1 (ACPU cluster 1) * 0x2: remote sensor 2 (ACPU cluster 0) * 0x3: remote sensor 3 (G3D) */ static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor) { … } /* * Temperature configuration register - Hdak conversion polling interval * * Bits [5:4] * * 0x0 : 0.768 ms * 0x1 : 6.144 ms * 0x2 : 49.152 ms * 0x3 : 393.216 ms */ static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value) { … } static int hi6220_thermal_irq_handler(struct hisi_thermal_sensor *sensor) { … } static int hi3660_thermal_irq_handler(struct hisi_thermal_sensor *sensor) { … } static int hi6220_thermal_get_temp(struct hisi_thermal_sensor *sensor) { … } static int hi3660_thermal_get_temp(struct hisi_thermal_sensor *sensor) { … } static int hi6220_thermal_disable_sensor(struct hisi_thermal_sensor *sensor) { … } static int hi3660_thermal_disable_sensor(struct hisi_thermal_sensor *sensor) { … } static int hi6220_thermal_enable_sensor(struct hisi_thermal_sensor *sensor) { … } static int hi3660_thermal_enable_sensor(struct hisi_thermal_sensor *sensor) { … } static int hi6220_thermal_probe(struct hisi_thermal_data *data) { … } static int hi3660_thermal_probe(struct hisi_thermal_data *data) { … } static int hisi_thermal_get_temp(struct thermal_zone_device *tz, int *temp) { … } static const struct thermal_zone_device_ops hisi_of_thermal_ops = …; static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) { … } static int hisi_thermal_register_sensor(struct platform_device *pdev, struct hisi_thermal_sensor *sensor) { … } static const struct hisi_thermal_ops hi6220_ops = …; static const struct hisi_thermal_ops hi3660_ops = …; static const struct of_device_id of_hisi_thermal_match[] = …; MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, bool on) { … } static int hisi_thermal_probe(struct platform_device *pdev) { … } static void hisi_thermal_remove(struct platform_device *pdev) { … } static int hisi_thermal_suspend(struct device *dev) { … } static int hisi_thermal_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops, hisi_thermal_suspend, hisi_thermal_resume); static struct platform_driver hisi_thermal_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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