drivers/thermal/imx_thermal.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2014 Freescale Semiconductor, Inc.
  * Author: Nitin Garg <nitin.garg@freescale.com>
  *             Ye Li <Ye.Li@freescale.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <config.h>
 #include <common.h>
 #include <div64.h>
 #include <fuse.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>
 #include <dm.h>
 #include <errno.h>
 #include <malloc.h>
 #include <thermal.h>
 #include <imx_thermal.h>

 /* board will busyloop until this many degrees C below CPU max temperature */
 #define TEMPERATURE_HOT_DELTA   5 /* CPU maxT - 5C */
 #define FACTOR0			10000000
 #define FACTOR1			15976
 #define FACTOR2			4297157
 #define MEASURE_FREQ		327
 #define TEMPERATURE_MIN         -40
 #define TEMPERATURE_HOT         85
 #define TEMPERATURE_MAX         125

 #define TEMPSENSE0_TEMP_CNT_SHIFT	8
 #define TEMPSENSE0_TEMP_CNT_MASK	(0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
 #define TEMPSENSE0_FINISHED		(1 << 2)
 #define TEMPSENSE0_MEASURE_TEMP		(1 << 1)
 #define TEMPSENSE0_POWER_DOWN		(1 << 0)
 #define MISC0_REFTOP_SELBIASOFF		(1 << 3)
 #define TEMPSENSE1_MEASURE_FREQ		0xffff

 struct thermal_data {
 	unsigned int fuse;
 	int critical;
 	int minc;
 	int maxc;
 };

 #if defined(CONFIG_MX6)
 static int read_cpu_temperature(struct udevice *dev)
 {
 	int temperature;
 	unsigned int reg, n_meas;
 	const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
 	struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs;
 	struct thermal_data *priv = dev_get_priv(dev);
 	u32 fuse = priv->fuse;
 	int t1, n1;
 	u32 c1, c2;
 	u64 temp64;

 	/*
 	 * Sensor data layout:
 	 *   [31:20] - sensor value @ 25C
 	 * We use universal formula now and only need sensor value @ 25C
 	 * slope = 0.4297157 - (0.0015976 * 25C fuse)
 	 */
 	n1 = fuse >> 20;
 	t1 = 25; /* t1 always 25C */

 	/*
 	 * Derived from linear interpolation:
 	 * slope = 0.4297157 - (0.0015976 * 25C fuse)
 	 * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
 	 * (Nmeas - n1) / (Tmeas - t1) = slope
 	 * We want to reduce this down to the minimum computation necessary
 	 * for each temperature read.  Also, we want Tmeas in millicelsius
 	 * and we don't want to lose precision from integer division. So...
 	 * Tmeas = (Nmeas - n1) / slope + t1
 	 * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
 	 * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
 	 * Let constant c1 = (-1000 / slope)
 	 * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
 	 * Let constant c2 = n1 *c1 + 1000 * t1
 	 * milli_Tmeas = c2 - Nmeas * c1
 	 */
 	temp64 = FACTOR0;
 	temp64 *= 1000;
 	do_div(temp64, FACTOR1 * n1 - FACTOR2);
 	c1 = temp64;
 	c2 = n1 * c1 + 1000 * t1;

 	/*
 	 * now we only use single measure, every time we read
 	 * the temperature, we will power on/down anadig thermal
 	 * module
 	 */
 	writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
 	writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);

 	/* setup measure freq */
 	reg = readl(&anatop->tempsense1);
 	reg &= ~TEMPSENSE1_MEASURE_FREQ;
 	reg |= MEASURE_FREQ;
 	writel(reg, &anatop->tempsense1);

 	/* start the measurement process */
 	writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr);
 	writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
 	writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set);

 	/* make sure that the latest temp is valid */
 	while ((readl(&anatop->tempsense0) &
 		TEMPSENSE0_FINISHED) == 0)
 		udelay(10000);

 	/* read temperature count */
 	reg = readl(&anatop->tempsense0);
 	n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK)
 		>> TEMPSENSE0_TEMP_CNT_SHIFT;
 	writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);

 	/* milli_Tmeas = c2 - Nmeas * c1 */
 	temperature = (long)(c2 - n_meas * c1)/1000;

 	/* power down anatop thermal sensor */
 	writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
 	writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);

 	return temperature;
 }
 #elif defined(CONFIG_MX7)
 static int read_cpu_temperature(struct udevice *dev)
 {
 	unsigned int reg, tmp;
 	unsigned int raw_25c, te1;
 	int temperature;
 	unsigned int *priv = dev_get_priv(dev);
 	u32 fuse = *priv;
 	struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
 						 ANATOP_BASE_ADDR;
 	/*
 	 * fuse data layout:
 	 * [31:21] sensor value @ 25C
 	 * [20:18] hot temperature value
 	 * [17:9] sensor value of room
 	 * [8:0] sensor value of hot
 	 */

 	raw_25c = fuse >> 21;
 	if (raw_25c == 0)
 		raw_25c = 25;

 	te1 = (fuse >> 9) & 0x1ff;

 	/*
 	 * now we only use single measure, every time we read
 	 * the temperature, we will power on/down anadig thermal
 	 * module
 	 */
 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
 	writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);

 	/* write measure freq */
 	reg = readl(&ccm_anatop->tempsense1);
 	reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
 	reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
 	writel(reg, &ccm_anatop->tempsense1);

 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);

 	if (soc_rev() >= CHIP_REV_1_1) {
 		while ((readl(&ccm_anatop->tempsense1) &
 		       TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
 			;
 		reg = readl(&ccm_anatop->tempsense1);
 		tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
 		       >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
 	} else {
 		/*
 		 * Since we can not rely on finish bit, use 10ms
 		 * delay to get temperature. From RM, 17us is
 		 * enough to get data, but to gurantee to get
 		 * the data, delay 10ms here.
 		 */
 		udelay(10000);
 		reg = readl(&ccm_anatop->tempsense1);
 		tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
 		       >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
 	}

 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);

 	/* power down anatop thermal sensor */
 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
 	writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);

 	/* Single point */
 	temperature = tmp - (te1 - raw_25c);

 	return temperature;
 }
 #endif

 int imx_thermal_get_temp(struct udevice *dev, int *temp)
 {
 	struct thermal_data *priv = dev_get_priv(dev);
 	int cpu_tmp = 0;

 	cpu_tmp = read_cpu_temperature(dev);

 	while (cpu_tmp >= priv->critical) {
 		printf("CPU Temperature (%dC) too close to max (%dC)",
 		       cpu_tmp, priv->maxc);
 		puts(" waiting...\n");
 		udelay(5000000);
 		cpu_tmp = read_cpu_temperature(dev);
 	}

 	*temp = cpu_tmp;

 	return 0;
 }

 static const struct dm_thermal_ops imx_thermal_ops = {
 	.get_temp	= imx_thermal_get_temp,
 };

 static int imx_thermal_probe(struct udevice *dev)
 {
 	unsigned int fuse = ~0;

 	const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
 	struct thermal_data *priv = dev_get_priv(dev);

 	/* Read Temperature calibration data fuse */
 	fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);

 	if (is_soc_type(MXC_SOC_MX6)) {
 		/* Check for valid fuse */
 		if (fuse == 0 || fuse == ~0) {
 			debug("CPU:   Thermal invalid data, fuse: 0x%x\n",
 				fuse);
 			return -EPERM;
 		}
 	} else if (is_soc_type(MXC_SOC_MX7)) {
 		/* No Calibration data in FUSE? */
 		if ((fuse & 0x3ffff) == 0)
 			return -EPERM;
 		/* We do not support 105C TE2 */
 		if (((fuse & 0x1c0000) >> 18) == 0x6)
 			return -EPERM;
 	}

 	/* set critical cooling temp */
 	get_cpu_temp_grade(&priv->minc, &priv->maxc);
 	priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
 	priv->fuse = fuse;

 	enable_thermal_clk();

 	return 0;
 }

 U_BOOT_DRIVER(imx_thermal) = {
 	.name	= "imx_thermal",
 	.id	= UCLASS_THERMAL,
 	.ops	= &imx_thermal_ops,
 	.probe	= imx_thermal_probe,
 	.priv_auto_alloc_size = sizeof(struct thermal_data),
 	.flags  = DM_FLAG_PRE_RELOC,
 };
	/*
	* (C) Copyright 2014 Freescale Semiconductor, Inc.
	* Author: Nitin Garg <nitin.garg@freescale.com>
	* Ye Li <Ye.Li@freescale.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <config.h>
	#include <common.h>
	#include <div64.h>
	#include <fuse.h>
	#include <asm/io.h>
	#include <asm/arch/clock.h>
	#include <asm/arch/sys_proto.h>
	#include <dm.h>
	#include <errno.h>
	#include <malloc.h>
	#include <thermal.h>
	#include <imx_thermal.h>

	/* board will busyloop until this many degrees C below CPU max temperature */
	#define TEMPERATURE_HOT_DELTA 5 /* CPU maxT - 5C */
	#define FACTOR0 10000000
	#define FACTOR1 15976
	#define FACTOR2 4297157
	#define MEASURE_FREQ 327
	#define TEMPERATURE_MIN -40
	#define TEMPERATURE_HOT 85
	#define TEMPERATURE_MAX 125

	#define TEMPSENSE0_TEMP_CNT_SHIFT 8
	#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
	#define TEMPSENSE0_FINISHED (1 << 2)
	#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
	#define TEMPSENSE0_POWER_DOWN (1 << 0)
	#define MISC0_REFTOP_SELBIASOFF (1 << 3)
	#define TEMPSENSE1_MEASURE_FREQ 0xffff

	struct thermal_data {
	unsigned int fuse;
	int critical;
	int minc;
	int maxc;
	};

	#if defined(CONFIG_MX6)
	static int read_cpu_temperature(struct udevice *dev)
	{
	int temperature;
	unsigned int reg, n_meas;
	const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
	struct anatop_regs anatop = (struct anatop_regs )pdata->regs;
	struct thermal_data *priv = dev_get_priv(dev);
	u32 fuse = priv->fuse;
	int t1, n1;
	u32 c1, c2;
	u64 temp64;

	/*
	* Sensor data layout:
	* [31:20] - sensor value @ 25C
	* We use universal formula now and only need sensor value @ 25C
	* slope = 0.4297157 - (0.0015976 * 25C fuse)
	*/
	n1 = fuse >> 20;
	t1 = 25; /* t1 always 25C */

	/*
	* Derived from linear interpolation:
	* slope = 0.4297157 - (0.0015976 * 25C fuse)
	* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
	* (Nmeas - n1) / (Tmeas - t1) = slope
	* We want to reduce this down to the minimum computation necessary
	* for each temperature read. Also, we want Tmeas in millicelsius
	* and we don't want to lose precision from integer division. So...
	* Tmeas = (Nmeas - n1) / slope + t1
	* milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
	* milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
	* Let constant c1 = (-1000 / slope)
	* milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
	* Let constant c2 = n1 c1 + 1000 t1
	* milli_Tmeas = c2 - Nmeas * c1
	*/
	temp64 = FACTOR0;
	temp64 *= 1000;
	do_div(temp64, FACTOR1 * n1 - FACTOR2);
	c1 = temp64;
	c2 = n1 * c1 + 1000 * t1;

	/*
	* now we only use single measure, every time we read
	* the temperature, we will power on/down anadig thermal
	* module
	*/
	writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
	writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);

	/* setup measure freq */
	reg = readl(&anatop->tempsense1);
	reg &= ~TEMPSENSE1_MEASURE_FREQ;
	reg \|= MEASURE_FREQ;
	writel(reg, &anatop->tempsense1);

	/* start the measurement process */
	writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr);
	writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
	writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set);

	/* make sure that the latest temp is valid */
	while ((readl(&anatop->tempsense0) &
	TEMPSENSE0_FINISHED) == 0)
	udelay(10000);

	/* read temperature count */
	reg = readl(&anatop->tempsense0);
	n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK)
	>> TEMPSENSE0_TEMP_CNT_SHIFT;
	writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);

	/* milli_Tmeas = c2 - Nmeas * c1 */
	temperature = (long)(c2 - n_meas * c1)/1000;

	/* power down anatop thermal sensor */
	writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
	writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);

	return temperature;
	}
	#elif defined(CONFIG_MX7)
	static int read_cpu_temperature(struct udevice *dev)
	{
	unsigned int reg, tmp;
	unsigned int raw_25c, te1;
	int temperature;
	unsigned int *priv = dev_get_priv(dev);
	u32 fuse = *priv;
	struct mxc_ccm_anatop_reg ccm_anatop = (struct mxc_ccm_anatop_reg )
	ANATOP_BASE_ADDR;
	/*
	* fuse data layout:
	* [31:21] sensor value @ 25C
	* [20:18] hot temperature value
	* [17:9] sensor value of room
	* [8:0] sensor value of hot
	*/

	raw_25c = fuse >> 21;
	if (raw_25c == 0)
	raw_25c = 25;

	te1 = (fuse >> 9) & 0x1ff;

	/*
	* now we only use single measure, every time we read
	* the temperature, we will power on/down anadig thermal
	* module
	*/
	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
	writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);

	/* write measure freq */
	reg = readl(&ccm_anatop->tempsense1);
	reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
	reg \|= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
	writel(reg, &ccm_anatop->tempsense1);

	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);

	if (soc_rev() >= CHIP_REV_1_1) {
	while ((readl(&ccm_anatop->tempsense1) &
	TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
	;
	reg = readl(&ccm_anatop->tempsense1);
	tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
	>> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
	} else {
	/*
	* Since we can not rely on finish bit, use 10ms
	* delay to get temperature. From RM, 17us is
	* enough to get data, but to gurantee to get
	* the data, delay 10ms here.
	*/
	udelay(10000);
	reg = readl(&ccm_anatop->tempsense1);
	tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
	>> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
	}

	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);

	/* power down anatop thermal sensor */
	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
	writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);

	/* Single point */
	temperature = tmp - (te1 - raw_25c);

	return temperature;
	}
	#endif

	int imx_thermal_get_temp(struct udevice dev, int temp)
	{
	struct thermal_data *priv = dev_get_priv(dev);
	int cpu_tmp = 0;

	cpu_tmp = read_cpu_temperature(dev);

	while (cpu_tmp >= priv->critical) {
	printf("CPU Temperature (%dC) too close to max (%dC)",
	cpu_tmp, priv->maxc);
	puts(" waiting...\n");
	udelay(5000000);
	cpu_tmp = read_cpu_temperature(dev);
	}

	*temp = cpu_tmp;

	return 0;
	}

	static const struct dm_thermal_ops imx_thermal_ops = {
	.get_temp = imx_thermal_get_temp,
	};

	static int imx_thermal_probe(struct udevice *dev)
	{
	unsigned int fuse = ~0;

	const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
	struct thermal_data *priv = dev_get_priv(dev);

	/* Read Temperature calibration data fuse */
	fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);

	if (is_soc_type(MXC_SOC_MX6)) {
	/* Check for valid fuse */
	if (fuse == 0 \|\| fuse == ~0) {
	debug("CPU: Thermal invalid data, fuse: 0x%x\n",
	fuse);
	return -EPERM;
	}
	} else if (is_soc_type(MXC_SOC_MX7)) {
	/* No Calibration data in FUSE? */
	if ((fuse & 0x3ffff) == 0)
	return -EPERM;
	/* We do not support 105C TE2 */
	if (((fuse & 0x1c0000) >> 18) == 0x6)
	return -EPERM;
	}

	/* set critical cooling temp */
	get_cpu_temp_grade(&priv->minc, &priv->maxc);
	priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
	priv->fuse = fuse;

	enable_thermal_clk();

	return 0;
	}

	U_BOOT_DRIVER(imx_thermal) = {
	.name = "imx_thermal",
	.id = UCLASS_THERMAL,
	.ops = &imx_thermal_ops,
	.probe = imx_thermal_probe,
	.priv_auto_alloc_size = sizeof(struct thermal_data),
	.flags = DM_FLAG_PRE_RELOC,
	};