imx6: backport thermal driver

Signed-off-by: Luka Perkov <luka@openwrt.org>

SVN-Revision: 38229

1 files changed, 490 insertions, 0 deletions

diff --git a/target/linux/imx6/patches-3.10/0015-thermal-add-imx-thermal-driver-support.patch b/target/linux/imx6/patches-3.10/0015-thermal-add-imx-thermal-driver-support.patch
new file mode 100644
index 0000000..bd20d2d
--- /dev/null
+++ b/target/linux/imx6/patches-3.10/0015-thermal-add-imx-thermal-driver-support.patch
@@ -0,0 +1,490 @@
+From ca3de46b50809000b5ba708634e26ad979a4a63a Mon Sep 17 00:00:00 2001
+From: Shawn Guo <shawn.guo@linaro.org>
+Date: Mon, 24 Jun 2013 14:30:44 +0800
+Subject: [PATCH] thermal: add imx thermal driver support
+
+This is based on the initial imx thermal work done by
+Rob Lee <rob.lee@linaro.org> (Not sure if the email address is still
+valid).  Since he is no longer interested in the work and I have
+rewritten a significant amount of the code, I just took the authorship
+over from him.
+
+It adds the imx thermal support using Temperature Monitor (TEMPMON)
+block found on some Freescale i.MX SoCs.  The driver uses syscon regmap
+interface to access TEMPMON control registers and calibration data, and
+supports cpufreq as the cooling device.
+
+Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
+Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
+---
+ .../devicetree/bindings/thermal/imx-thermal.txt    |  17 +
+ drivers/thermal/Kconfig                            |  11 +
+ drivers/thermal/Makefile                           |   1 +
+ drivers/thermal/imx_thermal.c                      | 397 +++++++++++++++++++++
+ 4 files changed, 426 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/thermal/imx-thermal.txt
+ create mode 100644 drivers/thermal/imx_thermal.c
+
+diff --git a/Documentation/devicetree/bindings/thermal/imx-thermal.txt b/Documentation/devicetree/bindings/thermal/imx-thermal.txt
+new file mode 100644
+index 0000000..541c25e
+--- /dev/null
++++ b/Documentation/devicetree/bindings/thermal/imx-thermal.txt
+@@ -0,0 +1,17 @@
++* Temperature Monitor (TEMPMON) on Freescale i.MX SoCs
++
++Required properties:
++- compatible : "fsl,imx6q-thermal"
++- fsl,tempmon : phandle pointer to system controller that contains TEMPMON
++  control registers, e.g. ANATOP on imx6q.
++- fsl,tempmon-data : phandle pointer to fuse controller that contains TEMPMON
++  calibration data, e.g. OCOTP on imx6q.  The details about calibration data
++  can be found in SoC Reference Manual.
++
++Example:
++
++tempmon {
++	compatible = "fsl,imx6q-tempmon";
++	fsl,tempmon = <&anatop>;
++	fsl,tempmon-data = <&ocotp>;
++};
+diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
+index e988c81..69eed55 100644
+--- a/drivers/thermal/Kconfig
++++ b/drivers/thermal/Kconfig
+@@ -91,6 +91,17 @@ config THERMAL_EMULATION
+ 	  because userland can easily disable the thermal policy by simply
+ 	  flooding this sysfs node with low temperature values.
+ 
++config IMX_THERMAL
++	tristate "Temperature sensor driver for Freescale i.MX SoCs"
++	depends on CPU_THERMAL
++	depends on MFD_SYSCON
++	depends on OF
++	help
++	  Support for Temperature Monitor (TEMPMON) found on Freescale i.MX SoCs.
++	  It supports one critical trip point and one passive trip point.  The
++	  cpufreq is used as the cooling device to throttle CPUs when the
++	  passive trip is crossed.
++
+ config SPEAR_THERMAL
+ 	bool "SPEAr thermal sensor driver"
+ 	depends on PLAT_SPEAR
+diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
+index 67184a2..dff19c6 100644
+--- a/drivers/thermal/Makefile
++++ b/drivers/thermal/Makefile
+@@ -21,6 +21,7 @@ obj-$(CONFIG_EXYNOS_THERMAL)	+= exynos_thermal.o
+ obj-$(CONFIG_DOVE_THERMAL)  	+= dove_thermal.o
+ obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
+ obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
++obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
+ obj-$(CONFIG_DB8500_CPUFREQ_COOLING)	+= db8500_cpufreq_cooling.o
+ obj-$(CONFIG_INTEL_POWERCLAMP)	+= intel_powerclamp.o
+ obj-$(CONFIG_X86_PKG_TEMP_THERMAL)	+= x86_pkg_temp_thermal.o
+diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
+new file mode 100644
+index 0000000..d16c33c
+--- /dev/null
++++ b/drivers/thermal/imx_thermal.c
+@@ -0,0 +1,397 @@
++/*
++ * Copyright 2013 Freescale Semiconductor, Inc.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ *
++ */
++
++#include <linux/cpu_cooling.h>
++#include <linux/cpufreq.h>
++#include <linux/delay.h>
++#include <linux/device.h>
++#include <linux/init.h>
++#include <linux/io.h>
++#include <linux/kernel.h>
++#include <linux/mfd/syscon.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/platform_device.h>
++#include <linux/regmap.h>
++#include <linux/slab.h>
++#include <linux/thermal.h>
++#include <linux/types.h>
++
++#define REG_SET		0x4
++#define REG_CLR		0x8
++#define REG_TOG		0xc
++
++#define MISC0				0x0150
++#define MISC0_REFTOP_SELBIASOFF		(1 << 3)
++
++#define TEMPSENSE0			0x0180
++#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 TEMPSENSE1			0x0190
++#define TEMPSENSE1_MEASURE_FREQ		0xffff
++
++#define OCOTP_ANA1			0x04e0
++
++/* The driver supports 1 passive trip point and 1 critical trip point */
++enum imx_thermal_trip {
++	IMX_TRIP_PASSIVE,
++	IMX_TRIP_CRITICAL,
++	IMX_TRIP_NUM,
++};
++
++/*
++ * It defines the temperature in millicelsius for passive trip point
++ * that will trigger cooling action when crossed.
++ */
++#define IMX_TEMP_PASSIVE		85000
++
++/*
++ * The maximum die temperature on imx parts is 105C, let's give some cushion
++ * for noise and possible temperature rise between measurements.
++ */
++#define IMX_TEMP_CRITICAL		100000
++
++#define IMX_POLLING_DELAY		2000 /* millisecond */
++#define IMX_PASSIVE_DELAY		1000
++
++struct imx_thermal_data {
++	struct thermal_zone_device *tz;
++	struct thermal_cooling_device *cdev;
++	enum thermal_device_mode mode;
++	struct regmap *tempmon;
++	int c1, c2; /* See formula in imx_get_sensor_data() */
++};
++
++static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
++{
++	struct imx_thermal_data *data = tz->devdata;
++	struct regmap *map = data->tempmon;
++	static unsigned long last_temp;
++	unsigned int n_meas;
++	u32 val;
++
++	/*
++	 * Every time we measure the temperature, we will power on the
++	 * temperature sensor, enable measurements, take a reading,
++	 * disable measurements, power off the temperature sensor.
++	 */
++	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
++	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
++
++	/*
++	 * According to the temp sensor designers, it may require up to ~17us
++	 * to complete a measurement.
++	 */
++	usleep_range(20, 50);
++
++	regmap_read(map, TEMPSENSE0, &val);
++	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
++	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
++
++	if ((val & TEMPSENSE0_FINISHED) == 0) {
++		dev_dbg(&tz->device, "temp measurement never finished\n");
++		return -EAGAIN;
++	}
++
++	n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
++
++	/* See imx_get_sensor_data() for formula derivation */
++	*temp = data->c2 + data->c1 * n_meas;
++
++	if (*temp != last_temp) {
++		dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
++		last_temp = *temp;
++	}
++
++	return 0;
++}
++
++static int imx_get_mode(struct thermal_zone_device *tz,
++			enum thermal_device_mode *mode)
++{
++	struct imx_thermal_data *data = tz->devdata;
++
++	*mode = data->mode;
++
++	return 0;
++}
++
++static int imx_set_mode(struct thermal_zone_device *tz,
++			enum thermal_device_mode mode)
++{
++	struct imx_thermal_data *data = tz->devdata;
++
++	if (mode == THERMAL_DEVICE_ENABLED) {
++		tz->polling_delay = IMX_POLLING_DELAY;
++		tz->passive_delay = IMX_PASSIVE_DELAY;
++	} else {
++		tz->polling_delay = 0;
++		tz->passive_delay = 0;
++	}
++
++	data->mode = mode;
++	thermal_zone_device_update(tz);
++
++	return 0;
++}
++
++static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
++			     enum thermal_trip_type *type)
++{
++	*type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
++					     THERMAL_TRIP_CRITICAL;
++	return 0;
++}
++
++static int imx_get_crit_temp(struct thermal_zone_device *tz,
++			     unsigned long *temp)
++{
++	*temp = IMX_TEMP_CRITICAL;
++	return 0;
++}
++
++static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
++			     unsigned long *temp)
++{
++	*temp = (trip == IMX_TRIP_PASSIVE) ? IMX_TEMP_PASSIVE :
++					     IMX_TEMP_CRITICAL;
++	return 0;
++}
++
++static int imx_bind(struct thermal_zone_device *tz,
++		    struct thermal_cooling_device *cdev)
++{
++	int ret;
++
++	ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
++					       THERMAL_NO_LIMIT,
++					       THERMAL_NO_LIMIT);
++	if (ret) {
++		dev_err(&tz->device,
++			"binding zone %s with cdev %s failed:%d\n",
++			tz->type, cdev->type, ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++static int imx_unbind(struct thermal_zone_device *tz,
++		      struct thermal_cooling_device *cdev)
++{
++	int ret;
++
++	ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
++	if (ret) {
++		dev_err(&tz->device,
++			"unbinding zone %s with cdev %s failed:%d\n",
++			tz->type, cdev->type, ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++static const struct thermal_zone_device_ops imx_tz_ops = {
++	.bind = imx_bind,
++	.unbind = imx_unbind,
++	.get_temp = imx_get_temp,
++	.get_mode = imx_get_mode,
++	.set_mode = imx_set_mode,
++	.get_trip_type = imx_get_trip_type,
++	.get_trip_temp = imx_get_trip_temp,
++	.get_crit_temp = imx_get_crit_temp,
++};
++
++static int imx_get_sensor_data(struct platform_device *pdev)
++{
++	struct imx_thermal_data *data = platform_get_drvdata(pdev);
++	struct regmap *map;
++	int t1, t2, n1, n2;
++	int ret;
++	u32 val;
++
++	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
++					      "fsl,tempmon-data");
++	if (IS_ERR(map)) {
++		ret = PTR_ERR(map);
++		dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
++		return ret;
++	}
++
++	ret = regmap_read(map, OCOTP_ANA1, &val);
++	if (ret) {
++		dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
++		return ret;
++	}
++
++	if (val == 0 || val == ~0) {
++		dev_err(&pdev->dev, "invalid sensor calibration data\n");
++		return -EINVAL;
++	}
++
++	/*
++	 * Sensor data layout:
++	 *   [31:20] - sensor value @ 25C
++	 *    [19:8] - sensor value of hot
++	 *     [7:0] - hot temperature value
++	 */
++	n1 = val >> 20;
++	n2 = (val & 0xfff00) >> 8;
++	t2 = val & 0xff;
++	t1 = 25; /* t1 always 25C */
++
++	/*
++	 * Derived from linear interpolation,
++	 * Tmeas = T2 + (Nmeas - N2) * (T1 - T2) / (N1 - N2)
++	 * 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...
++	 * milli_Tmeas = 1000 * T2 + 1000 * (Nmeas - N2) * (T1 - T2) / (N1 - N2)
++	 * Let constant c1 = 1000 * (T1 - T2) / (N1 - N2)
++	 * milli_Tmeas = (1000 * T2) + c1 * (Nmeas - N2)
++	 * milli_Tmeas = (1000 * T2) + (c1 * Nmeas) - (c1 * N2)
++	 * Let constant c2 = (1000 * T2) - (c1 * N2)
++	 * milli_Tmeas = c2 + (c1 * Nmeas)
++	 */
++	data->c1 = 1000 * (t1 - t2) / (n1 - n2);
++	data->c2 = 1000 * t2 - data->c1 * n2;
++
++	return 0;
++}
++
++static int imx_thermal_probe(struct platform_device *pdev)
++{
++	struct imx_thermal_data *data;
++	struct cpumask clip_cpus;
++	struct regmap *map;
++	int ret;
++
++	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
++	if (!data)
++		return -ENOMEM;
++
++	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
++	if (IS_ERR(map)) {
++		ret = PTR_ERR(map);
++		dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
++		return ret;
++	}
++	data->tempmon = map;
++
++	platform_set_drvdata(pdev, data);
++
++	ret = imx_get_sensor_data(pdev);
++	if (ret) {
++		dev_err(&pdev->dev, "failed to get sensor data\n");
++		return ret;
++	}
++
++	/* Make sure sensor is in known good state for measurements */
++	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
++	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
++	regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
++	regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
++	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
++
++	cpumask_set_cpu(0, &clip_cpus);
++	data->cdev = cpufreq_cooling_register(&clip_cpus);
++	if (IS_ERR(data->cdev)) {
++		ret = PTR_ERR(data->cdev);
++		dev_err(&pdev->dev,
++			"failed to register cpufreq cooling device: %d\n", ret);
++		return ret;
++	}
++
++	data->tz = thermal_zone_device_register("imx_thermal_zone",
++						IMX_TRIP_NUM, 0, data,
++						&imx_tz_ops, NULL,
++						IMX_PASSIVE_DELAY,
++						IMX_POLLING_DELAY);
++	if (IS_ERR(data->tz)) {
++		ret = PTR_ERR(data->tz);
++		dev_err(&pdev->dev,
++			"failed to register thermal zone device %d\n", ret);
++		cpufreq_cooling_unregister(data->cdev);
++		return ret;
++	}
++
++	data->mode = THERMAL_DEVICE_ENABLED;
++
++	return 0;
++}
++
++static int imx_thermal_remove(struct platform_device *pdev)
++{
++	struct imx_thermal_data *data = platform_get_drvdata(pdev);
++
++	thermal_zone_device_unregister(data->tz);
++	cpufreq_cooling_unregister(data->cdev);
++
++	return 0;
++}
++
++#ifdef CONFIG_PM_SLEEP
++static int imx_thermal_suspend(struct device *dev)
++{
++	struct imx_thermal_data *data = dev_get_drvdata(dev);
++	struct regmap *map = data->tempmon;
++	u32 val;
++
++	regmap_read(map, TEMPSENSE0, &val);
++	if ((val & TEMPSENSE0_POWER_DOWN) == 0) {
++		/*
++		 * If a measurement is taking place, wait for a long enough
++		 * time for it to finish, and then check again.  If it still
++		 * does not finish, something must go wrong.
++		 */
++		udelay(50);
++		regmap_read(map, TEMPSENSE0, &val);
++		if ((val & TEMPSENSE0_POWER_DOWN) == 0)
++			return -ETIMEDOUT;
++	}
++
++	return 0;
++}
++
++static int imx_thermal_resume(struct device *dev)
++{
++	/* Nothing to do for now */
++	return 0;
++}
++#endif
++
++static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
++			 imx_thermal_suspend, imx_thermal_resume);
++
++static const struct of_device_id of_imx_thermal_match[] = {
++	{ .compatible = "fsl,imx6q-tempmon", },
++	{ /* end */ }
++};
++
++static struct platform_driver imx_thermal = {
++	.driver = {
++		.name	= "imx_thermal",
++		.owner  = THIS_MODULE,
++		.pm	= &imx_thermal_pm_ops,
++		.of_match_table = of_imx_thermal_match,
++	},
++	.probe		= imx_thermal_probe,
++	.remove		= imx_thermal_remove,
++};
++module_platform_driver(imx_thermal);
++
++MODULE_AUTHOR("Freescale Semiconductor, Inc.");
++MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:imx-thermal");
+-- 
+1.8.4
+