thermal: sprd: Add Spreadtrum thermal driver support (554fdbaf) · Commits · 戴 / test

drivers/thermal/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -460,4 +460,11 @@ config UNIPHIER_THERMAL
		Enable this to plug in UniPhier on-chip PVT thermal driver into the
		thermal framework. The driver supports CPU thermal zone temperature
		reporting and a couple of trip points.

		config SPRD_THERMAL
		tristate "Temperature sensor on Spreadtrum SoCs"
		depends on ARCH_SPRD \|\| COMPILE_TEST
		help
		Support for the Spreadtrum thermal sensor driver in the Linux thermal
		framework.
		endif

drivers/thermal/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -57,3 +57,4 @@ obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o
		obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o
		obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o
		obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o
		obj-$(CONFIG_SPRD_THERMAL) += sprd_thermal.o

drivers/thermal/sprd_thermal.c

0 → 100644

+552 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (C) 2020 Spreadtrum Communications Inc.

		#include <linux/clk.h>
		#include <linux/io.h>
		#include <linux/iopoll.h>
		#include <linux/module.h>
		#include <linux/nvmem-consumer.h>
		#include <linux/of_device.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/thermal.h>

		#define SPRD_THM_CTL 0x0
		#define SPRD_THM_INT_EN 0x4
		#define SPRD_THM_INT_STS 0x8
		#define SPRD_THM_INT_RAW_STS 0xc
		#define SPRD_THM_DET_PERIOD 0x10
		#define SPRD_THM_INT_CLR 0x14
		#define SPRD_THM_INT_CLR_ST 0x18
		#define SPRD_THM_MON_PERIOD 0x4c
		#define SPRD_THM_MON_CTL 0x50
		#define SPRD_THM_INTERNAL_STS1 0x54
		#define SPRD_THM_RAW_READ_MSK 0x3ff

		#define SPRD_THM_OFFSET(id) ((id) * 0x4)
		#define SPRD_THM_TEMP(id) (SPRD_THM_OFFSET(id) + 0x5c)
		#define SPRD_THM_THRES(id) (SPRD_THM_OFFSET(id) + 0x2c)

		#define SPRD_THM_SEN(id) BIT((id) + 2)
		#define SPRD_THM_SEN_OVERHEAT_EN(id) BIT((id) + 8)
		#define SPRD_THM_SEN_OVERHEAT_ALARM_EN(id) BIT((id) + 0)

		/* bits definitions for register THM_CTL */
		#define SPRD_THM_SET_RDY_ST BIT(13)
		#define SPRD_THM_SET_RDY BIT(12)
		#define SPRD_THM_MON_EN BIT(1)
		#define SPRD_THM_EN BIT(0)

		/* bits definitions for register THM_INT_CTL */
		#define SPRD_THM_BIT_INT_EN BIT(26)
		#define SPRD_THM_OVERHEAT_EN BIT(25)
		#define SPRD_THM_OTP_TRIP_SHIFT 10

		/* bits definitions for register SPRD_THM_INTERNAL_STS1 */
		#define SPRD_THM_TEMPER_RDY BIT(0)

		#define SPRD_THM_DET_PERIOD_DATA 0x800
		#define SPRD_THM_DET_PERIOD_MASK GENMASK(19, 0)
		#define SPRD_THM_MON_MODE 0x7
		#define SPRD_THM_MON_MODE_MASK GENMASK(3, 0)
		#define SPRD_THM_MON_PERIOD_DATA 0x10
		#define SPRD_THM_MON_PERIOD_MASK GENMASK(15, 0)
		#define SPRD_THM_THRES_MASK GENMASK(19, 0)
		#define SPRD_THM_INT_CLR_MASK GENMASK(24, 0)

		/* thermal sensor calibration parameters */
		#define SPRD_THM_TEMP_LOW -40000
		#define SPRD_THM_TEMP_HIGH 120000
		#define SPRD_THM_OTP_TEMP 120000
		#define SPRD_THM_HOT_TEMP 75000
		#define SPRD_THM_RAW_DATA_LOW 0
		#define SPRD_THM_RAW_DATA_HIGH 1000
		#define SPRD_THM_SEN_NUM 8
		#define SPRD_THM_DT_OFFSET 24
		#define SPRD_THM_RATION_OFFSET 17
		#define SPRD_THM_RATION_SIGN 16

		#define SPRD_THM_RDYST_POLLING_TIME 10
		#define SPRD_THM_RDYST_TIMEOUT 700
		#define SPRD_THM_TEMP_READY_POLL_TIME 10000
		#define SPRD_THM_TEMP_READY_TIMEOUT 600000
		#define SPRD_THM_MAX_SENSOR 8

		struct sprd_thermal_sensor {
		struct thermal_zone_device *tzd;
		struct sprd_thermal_data *data;
		struct device *dev;
		int cal_slope;
		int cal_offset;
		int id;
		};

		struct sprd_thermal_data {
		const struct sprd_thm_variant_data *var_data;
		struct sprd_thermal_sensor *sensor[SPRD_THM_MAX_SENSOR];
		struct clk *clk;
		void __iomem *base;
		u32 ratio_off;
		int ratio_sign;
		int nr_sensors;
		};

		/*
		* The conversion between ADC and temperature is based on linear relationship,
		* and use idea_k to specify the slope and ideal_b to specify the offset.
		*
		* Since different Spreadtrum SoCs have different ideal_k and ideal_b,
		* we should save ideal_k and ideal_b in the device data structure.
		*/
		struct sprd_thm_variant_data {
		u32 ideal_k;
		u32 ideal_b;
		};

		static const struct sprd_thm_variant_data ums512_data = {
		.ideal_k = 262,
		.ideal_b = 66400,
		};

		static inline void sprd_thm_update_bits(void __iomem *reg, u32 mask, u32 val)
		{
		u32 tmp, orig;

		orig = readl(reg);
		tmp = orig & ~mask;
		tmp \|= val & mask;
		writel(tmp, reg);
		}

		static int sprd_thm_cal_read(struct device_node np, const char cell_id,
		u32 *val)
		{
		struct nvmem_cell *cell;
		void *buf;
		size_t len;

		cell = of_nvmem_cell_get(np, cell_id);
		if (IS_ERR(cell))
		return PTR_ERR(cell);

		buf = nvmem_cell_read(cell, &len);
		nvmem_cell_put(cell);
		if (IS_ERR(buf))
		return PTR_ERR(buf);

		if (len > sizeof(u32)) {
		kfree(buf);
		return -EINVAL;
		}

		memcpy(val, buf, len);

		kfree(buf);
		return 0;
		}

		static int sprd_thm_sensor_calibration(struct device_node *np,
		struct sprd_thermal_data *thm,
		struct sprd_thermal_sensor *sen)
		{
		int ret;
		/*
		* According to thermal datasheet, the default calibration offset is 64,
		* and the default ratio is 1000.
		*/
		int dt_offset = 64, ratio = 1000;

		ret = sprd_thm_cal_read(np, "sen_delta_cal", &dt_offset);
		if (ret)
		return ret;

		ratio += thm->ratio_sign * thm->ratio_off;

		/*
		* According to the ideal slope K and ideal offset B, combined with
		* calibration value of thermal from efuse, then calibrate the real
		* slope k and offset b:
		* k_cal = (k * ratio) / 1000.
		* b_cal = b + (dt_offset - 64) * 500.
		*/
		sen->cal_slope = (thm->var_data->ideal_k * ratio) / 1000;
		sen->cal_offset = thm->var_data->ideal_b + (dt_offset - 128) * 250;

		return 0;
		}

		static int sprd_thm_rawdata_to_temp(struct sprd_thermal_sensor *sen,
		u32 rawdata)
		{
		clamp(rawdata, (u32)SPRD_THM_RAW_DATA_LOW, (u32)SPRD_THM_RAW_DATA_HIGH);

		/*
		* According to the thermal datasheet, the formula of converting
		* adc value to the temperature value should be:
		* T_final = k_cal * x - b_cal.
		*/
		return sen->cal_slope * rawdata - sen->cal_offset;
		}

		static int sprd_thm_temp_to_rawdata(int temp, struct sprd_thermal_sensor *sen)
		{
		u32 val;

		clamp(temp, (int)SPRD_THM_TEMP_LOW, (int)SPRD_THM_TEMP_HIGH);

		/*
		* According to the thermal datasheet, the formula of converting
		* adc value to the temperature value should be:
		* T_final = k_cal * x - b_cal.
		*/
		val = (temp + sen->cal_offset) / sen->cal_slope;

		return clamp(val, val, (u32)(SPRD_THM_RAW_DATA_HIGH - 1));
		}

		static int sprd_thm_read_temp(void devdata, int temp)
		{
		struct sprd_thermal_sensor *sen = devdata;
		u32 data;

		data = readl(sen->data->base + SPRD_THM_TEMP(sen->id)) &
		SPRD_THM_RAW_READ_MSK;

		*temp = sprd_thm_rawdata_to_temp(sen, data);

		return 0;
		}

		static const struct thermal_zone_of_device_ops sprd_thm_ops = {
		.get_temp = sprd_thm_read_temp,
		};

		static int sprd_thm_poll_ready_status(struct sprd_thermal_data *thm)
		{
		u32 val;
		int ret;

		/*
		* Wait for thermal ready status before configuring thermal parameters.
		*/
		ret = readl_poll_timeout(thm->base + SPRD_THM_CTL, val,
		!(val & SPRD_THM_SET_RDY_ST),
		SPRD_THM_RDYST_POLLING_TIME,
		SPRD_THM_RDYST_TIMEOUT);
		if (ret)
		return ret;

		sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_MON_EN,
		SPRD_THM_MON_EN);
		sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_SET_RDY,
		SPRD_THM_SET_RDY);
		return 0;
		}

		static int sprd_thm_wait_temp_ready(struct sprd_thermal_data *thm)
		{
		u32 val;

		/* Wait for first temperature data ready before reading temperature */
		return readl_poll_timeout(thm->base + SPRD_THM_INTERNAL_STS1, val,
		!(val & SPRD_THM_TEMPER_RDY),
		SPRD_THM_TEMP_READY_POLL_TIME,
		SPRD_THM_TEMP_READY_TIMEOUT);
		}

		static int sprd_thm_set_ready(struct sprd_thermal_data *thm)
		{
		int ret;

		ret = sprd_thm_poll_ready_status(thm);
		if (ret)
		return ret;

		/*
		* Clear interrupt status, enable thermal interrupt and enable thermal.
		*
		* The SPRD thermal controller integrates a hardware interrupt signal,
		* which means if the temperature is overheat, it will generate an
		* interrupt and notify the event to PMIC automatically to shutdown the
		* system. So here we should enable the interrupt bits, though we have
		* not registered an irq handler.
		*/
		writel(SPRD_THM_INT_CLR_MASK, thm->base + SPRD_THM_INT_CLR);
		sprd_thm_update_bits(thm->base + SPRD_THM_INT_EN,
		SPRD_THM_BIT_INT_EN, SPRD_THM_BIT_INT_EN);
		sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
		SPRD_THM_EN, SPRD_THM_EN);
		return 0;
		}

		static void sprd_thm_sensor_init(struct sprd_thermal_data *thm,
		struct sprd_thermal_sensor *sen)
		{
		u32 otp_rawdata, hot_rawdata;

		otp_rawdata = sprd_thm_temp_to_rawdata(SPRD_THM_OTP_TEMP, sen);
		hot_rawdata = sprd_thm_temp_to_rawdata(SPRD_THM_HOT_TEMP, sen);

		/* Enable the sensor' overheat temperature protection interrupt */
		sprd_thm_update_bits(thm->base + SPRD_THM_INT_EN,
		SPRD_THM_SEN_OVERHEAT_ALARM_EN(sen->id),
		SPRD_THM_SEN_OVERHEAT_ALARM_EN(sen->id));

		/* Set the sensor' overheat and hot threshold temperature */
		sprd_thm_update_bits(thm->base + SPRD_THM_THRES(sen->id),
		SPRD_THM_THRES_MASK,
		(otp_rawdata << SPRD_THM_OTP_TRIP_SHIFT) \|
		hot_rawdata);

		/* Enable the corresponding sensor */
		sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_SEN(sen->id),
		SPRD_THM_SEN(sen->id));
		}

		static void sprd_thm_para_config(struct sprd_thermal_data *thm)
		{
		/* Set the period of two valid temperature detection action */
		sprd_thm_update_bits(thm->base + SPRD_THM_DET_PERIOD,
		SPRD_THM_DET_PERIOD_MASK, SPRD_THM_DET_PERIOD);

		/* Set the sensors' monitor mode */
		sprd_thm_update_bits(thm->base + SPRD_THM_MON_CTL,
		SPRD_THM_MON_MODE_MASK, SPRD_THM_MON_MODE);

		/* Set the sensors' monitor period */
		sprd_thm_update_bits(thm->base + SPRD_THM_MON_PERIOD,
		SPRD_THM_MON_PERIOD_MASK, SPRD_THM_MON_PERIOD);
		}

		static void sprd_thm_toggle_sensor(struct sprd_thermal_sensor *sen, bool on)
		{
		struct thermal_zone_device *tzd = sen->tzd;

		tzd->ops->set_mode(tzd,
		on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
		}

		static int sprd_thm_probe(struct platform_device *pdev)
		{
		struct device_node *np = pdev->dev.of_node;
		struct device_node *sen_child;
		struct sprd_thermal_data *thm;
		struct sprd_thermal_sensor *sen;
		const struct sprd_thm_variant_data *pdata;
		int ret, i;
		u32 val;

		pdata = of_device_get_match_data(&pdev->dev);
		if (!pdata) {
		dev_err(&pdev->dev, "No matching driver data found\n");
		return -EINVAL;
		}

		thm = devm_kzalloc(&pdev->dev, sizeof(*thm), GFP_KERNEL);
		if (!thm)
		return -ENOMEM;

		thm->var_data = pdata;
		thm->base = devm_platform_ioremap_resource(pdev, 0);
		if (!thm->base)
		return -ENOMEM;

		thm->nr_sensors = of_get_child_count(np);
		if (thm->nr_sensors == 0 \|\| thm->nr_sensors > SPRD_THM_MAX_SENSOR) {
		dev_err(&pdev->dev, "incorrect sensor count\n");
		return -EINVAL;
		}

		thm->clk = devm_clk_get(&pdev->dev, "enable");
		if (IS_ERR(thm->clk)) {
		dev_err(&pdev->dev, "failed to get enable clock\n");
		return PTR_ERR(thm->clk);
		}

		ret = clk_prepare_enable(thm->clk);
		if (ret)
		return ret;

		sprd_thm_para_config(thm);

		ret = sprd_thm_cal_read(np, "thm_sign_cal", &val);
		if (ret)
		goto disable_clk;

		if (val > 0)
		thm->ratio_sign = -1;
		else
		thm->ratio_sign = 1;

		ret = sprd_thm_cal_read(np, "thm_ratio_cal", &thm->ratio_off);
		if (ret)
		goto disable_clk;

		for_each_child_of_node(np, sen_child) {
		sen = devm_kzalloc(&pdev->dev, sizeof(*sen), GFP_KERNEL);
		if (!sen) {
		ret = -ENOMEM;
		goto disable_clk;
		}

		sen->data = thm;
		sen->dev = &pdev->dev;

		ret = of_property_read_u32(sen_child, "reg", &sen->id);
		if (ret) {
		dev_err(&pdev->dev, "get sensor reg failed");
		goto disable_clk;
		}

		ret = sprd_thm_sensor_calibration(sen_child, thm, sen);
		if (ret) {
		dev_err(&pdev->dev, "efuse cal analysis failed");
		goto disable_clk;
		}

		sprd_thm_sensor_init(thm, sen);

		sen->tzd = devm_thermal_zone_of_sensor_register(sen->dev,
		sen->id,
		sen,
		&sprd_thm_ops);
		if (IS_ERR(sen->tzd)) {
		dev_err(&pdev->dev, "register thermal zone failed %d\n",
		sen->id);
		ret = PTR_ERR(sen->tzd);
		goto disable_clk;
		}

		thm->sensor[sen->id] = sen;
		}

		ret = sprd_thm_set_ready(thm);
		if (ret)
		goto disable_clk;

		ret = sprd_thm_wait_temp_ready(thm);
		if (ret)
		goto disable_clk;

		for (i = 0; i < thm->nr_sensors; i++)
		sprd_thm_toggle_sensor(thm->sensor[i], true);

		platform_set_drvdata(pdev, thm);
		return 0;

		disable_clk:
		clk_disable_unprepare(thm->clk);
		return ret;
		}

		#ifdef CONFIG_PM_SLEEP
		static void sprd_thm_hw_suspend(struct sprd_thermal_data *thm)
		{
		int i;

		for (i = 0; i < thm->nr_sensors; i++) {
		sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
		SPRD_THM_SEN(thm->sensor[i]->id), 0);
		}

		sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
		SPRD_THM_EN, 0x0);
		}

		static int sprd_thm_suspend(struct device *dev)
		{
		struct sprd_thermal_data *thm = dev_get_drvdata(dev);
		int i;

		for (i = 0; i < thm->nr_sensors; i++)
		sprd_thm_toggle_sensor(thm->sensor[i], false);

		sprd_thm_hw_suspend(thm);
		clk_disable_unprepare(thm->clk);

		return 0;
		}

		static int sprd_thm_hw_resume(struct sprd_thermal_data *thm)
		{
		int ret, i;

		for (i = 0; i < thm->nr_sensors; i++) {
		sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
		SPRD_THM_SEN(thm->sensor[i]->id),
		SPRD_THM_SEN(thm->sensor[i]->id));
		}

		ret = sprd_thm_poll_ready_status(thm);
		if (ret)
		return ret;

		writel(SPRD_THM_INT_CLR_MASK, thm->base + SPRD_THM_INT_CLR);
		sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
		SPRD_THM_EN, SPRD_THM_EN);
		return sprd_thm_wait_temp_ready(thm);
		}

		static int sprd_thm_resume(struct device *dev)
		{
		struct sprd_thermal_data *thm = dev_get_drvdata(dev);
		int ret, i;

		ret = clk_prepare_enable(thm->clk);
		if (ret)
		return ret;

		ret = sprd_thm_hw_resume(thm);
		if (ret)
		goto disable_clk;

		for (i = 0; i < thm->nr_sensors; i++)
		sprd_thm_toggle_sensor(thm->sensor[i], true);

		return 0;

		disable_clk:
		clk_disable_unprepare(thm->clk);
		return ret;
		}
		#endif

		static int sprd_thm_remove(struct platform_device *pdev)
		{
		struct sprd_thermal_data *thm = platform_get_drvdata(pdev);
		int i;

		for (i = 0; i < thm->nr_sensors; i++) {
		sprd_thm_toggle_sensor(thm->sensor[i], false);
		devm_thermal_zone_of_sensor_unregister(&pdev->dev,
		thm->sensor[i]->tzd);
		}

		clk_disable_unprepare(thm->clk);
		return 0;
		}

		static const struct of_device_id sprd_thermal_of_match[] = {
		{ .compatible = "sprd,ums512-thermal", .data = &ums512_data },
		{ },
		};

		static const struct dev_pm_ops sprd_thermal_pm_ops = {
		SET_SYSTEM_SLEEP_PM_OPS(sprd_thm_suspend, sprd_thm_resume)
		};

		static struct platform_driver sprd_thermal_driver = {
		.probe = sprd_thm_probe,
		.remove = sprd_thm_remove,
		.driver = {
		.name = "sprd-thermal",
		.pm = &sprd_thermal_pm_ops,
		.of_match_table = sprd_thermal_of_match,
		},
		};

		module_platform_driver(sprd_thermal_driver);

		MODULE_AUTHOR("Freeman Liu <freeman.liu@unisoc.com>");
		MODULE_DESCRIPTION("Spreadtrum thermal driver");
		MODULE_LICENSE("GPL v2");

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