From a4dff94ffde7df6aeeb11cd548e53b22bdabd04e Mon Sep 17 00:00:00 2001 From: Wei Ni Date: Tue, 29 Mar 2016 18:29:11 +0800 Subject: thermal: tegra: move tegra thermal files into tegra directory Move Tegra soctherm driver to tegra directory, it's easy to maintain and add more new function support for Tegra platforms. This will also help to split soctherm driver into common parts and chip specific data related parts. Signed-off-by: Wei Ni Signed-off-by: Eduardo Valentin --- drivers/thermal/Kconfig | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) (limited to 'drivers/thermal/Kconfig') diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 3c3dc4a3d52c..a6777cbf3d53 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -260,16 +260,6 @@ config ARMADA_THERMAL Enable this option if you want to have support for thermal management controller present in Armada 370 and Armada XP SoC. -config TEGRA_SOCTHERM - tristate "Tegra SOCTHERM thermal management" - depends on ARCH_TEGRA - help - Enable this option for integrated thermal management support on NVIDIA - Tegra124 systems-on-chip. The driver supports four thermal zones - (CPU, GPU, MEM, PLLX). Cooling devices can be bound to the thermal - zones to manage temperatures. This option is also required for the - emergency thermal reset (thermtrip) feature to function. - config DB8500_CPUFREQ_COOLING tristate "DB8500 cpufreq cooling" depends on ARCH_U8500 || COMPILE_TEST @@ -399,6 +389,8 @@ depends on ARCH_STI && OF source "drivers/thermal/st/Kconfig" endmenu +source "drivers/thermal/tegra/Kconfig" + config QCOM_SPMI_TEMP_ALARM tristate "Qualcomm SPMI PMIC Temperature Alarm" depends on OF && SPMI && IIO -- cgit v1.2.3 From 0b58c08b593d082858e74503bdf553ea01f9f15a Mon Sep 17 00:00:00 2001 From: Marc Gonzalez Date: Tue, 19 Apr 2016 16:21:16 +0200 Subject: thermal: add temperature sensor support for tango SoC The Tango thermal driver provides support for the primitive temperature sensor embedded in Tango chips since the SMP8758. This sensor only generates a 1-bit signal to indicate whether the die temperature exceeds a programmable threshold. Signed-off-by: Marc Gonzalez Signed-off-by: Eduardo Valentin --- .../devicetree/bindings/thermal/tango-thermal.txt | 17 ++++ drivers/thermal/Kconfig | 9 ++ drivers/thermal/Makefile | 1 + drivers/thermal/tango_thermal.c | 111 +++++++++++++++++++++ 4 files changed, 138 insertions(+) create mode 100644 Documentation/devicetree/bindings/thermal/tango-thermal.txt create mode 100644 drivers/thermal/tango_thermal.c (limited to 'drivers/thermal/Kconfig') diff --git a/Documentation/devicetree/bindings/thermal/tango-thermal.txt b/Documentation/devicetree/bindings/thermal/tango-thermal.txt new file mode 100644 index 000000000000..212198d4b937 --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/tango-thermal.txt @@ -0,0 +1,17 @@ +* Tango Thermal + +The SMP8758 SoC includes 3 instances of this temperature sensor +(in the CPU, video decoder, and PCIe controller). + +Required properties: +- #thermal-sensor-cells: Should be 0 (see thermal.txt) +- compatible: "sigma,smp8758-thermal" +- reg: Address range of the thermal registers + +Example: + + cpu_temp: thermal@920100 { + #thermal-sensor-cells = <0>; + compatible = "sigma,smp8758-thermal"; + reg = <0x920100 12>; + }; diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index a6777cbf3d53..ee02e6021c94 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -389,6 +389,15 @@ depends on ARCH_STI && OF source "drivers/thermal/st/Kconfig" endmenu +config TANGO_THERMAL + tristate "Tango thermal management" + depends on ARCH_TANGO || COMPILE_TEST + help + Enable the Tango thermal driver, which supports the primitive + temperature sensor embedded in Tango chips since the SMP8758. + This sensor only generates a 1-bit signal to indicate whether + the die temperature exceeds a programmable threshold. + source "drivers/thermal/tegra/Kconfig" config QCOM_SPMI_TEMP_ALARM diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index d64f7f707702..998134ff3b45 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -35,6 +35,7 @@ obj-y += samsung/ obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o +obj-$(CONFIG_TANGO_THERMAL) += tango_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 diff --git a/drivers/thermal/tango_thermal.c b/drivers/thermal/tango_thermal.c new file mode 100644 index 000000000000..d6592bfbd057 --- /dev/null +++ b/drivers/thermal/tango_thermal.c @@ -0,0 +1,111 @@ +#include +#include +#include +#include +#include + +/* + * According to a data sheet draft, "this temperature sensor uses a bandgap + * type of circuit to compare a voltage which has a negative temperature + * coefficient with a voltage that is proportional to absolute temperature. + * A resistor bank allows 41 different temperature thresholds to be selected + * and the logic output will then indicate whether the actual die temperature + * lies above or below the selected threshold." + */ + +#define TEMPSI_CMD 0 +#define TEMPSI_RES 4 +#define TEMPSI_CFG 8 + +#define CMD_OFF 0 +#define CMD_ON 1 +#define CMD_READ 2 + +#define IDX_MIN 15 +#define IDX_MAX 40 + +struct tango_thermal_priv { + void __iomem *base; + int thresh_idx; +}; + +static bool temp_above_thresh(void __iomem *base, int thresh_idx) +{ + writel(CMD_READ | thresh_idx << 8, base + TEMPSI_CMD); + usleep_range(10, 20); + writel(CMD_READ | thresh_idx << 8, base + TEMPSI_CMD); + + return readl(base + TEMPSI_RES); +} + +static int tango_get_temp(void *arg, int *res) +{ + struct tango_thermal_priv *priv = arg; + int idx = priv->thresh_idx; + + if (temp_above_thresh(priv->base, idx)) { + /* Search upward by incrementing thresh_idx */ + while (idx < IDX_MAX && temp_above_thresh(priv->base, ++idx)) + cpu_relax(); + idx = idx - 1; /* always return lower bound */ + } else { + /* Search downward by decrementing thresh_idx */ + while (idx > IDX_MIN && !temp_above_thresh(priv->base, --idx)) + cpu_relax(); + } + + *res = (idx * 9 / 2 - 38) * 1000; /* millidegrees Celsius */ + priv->thresh_idx = idx; + + return 0; +} + +static const struct thermal_zone_of_device_ops ops = { + .get_temp = tango_get_temp, +}; + +static int tango_thermal_probe(struct platform_device *pdev) +{ + struct resource *res; + struct tango_thermal_priv *priv; + struct thermal_zone_device *tzdev; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->thresh_idx = IDX_MIN; + writel(CMD_ON, priv->base + TEMPSI_CMD); + + tzdev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv, &ops); + if (IS_ERR(tzdev)) + return PTR_ERR(tzdev); + + return 0; +} + +static const struct of_device_id tango_sensor_ids[] = { + { + .compatible = "sigma,smp8758-thermal", + }, + { /* sentinel */ } +}; + +static struct platform_driver tango_thermal_driver = { + .probe = tango_thermal_probe, + .driver = { + .name = "tango-thermal", + .of_match_table = tango_sensor_ids, + }, +}; + +module_platform_driver(tango_thermal_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Sigma Designs"); +MODULE_DESCRIPTION("Tango temperature sensor"); -- cgit v1.2.3 From b3aef78f76959b94e6df54f80040669a11cc4897 Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Tue, 19 Apr 2016 12:52:01 +0530 Subject: thermal: generic-adc: Add ADC based thermal sensor driver In some of platform, thermal sensors like NCT thermistors are connected to the one of ADC channel. The temperature is read by reading the voltage across the sensor resistance via ADC. Lookup table for ADC read value to temperature is referred to get temperature. ADC is read via IIO framework. Add support for thermal sensor driver which read the voltage across sensor resistance from ADC through IIO framework. Acked-by: Jonathan Cameron Signed-off-by: Laxman Dewangan Signed-off-by: Eduardo Valentin --- drivers/thermal/Kconfig | 10 ++ drivers/thermal/Makefile | 1 + drivers/thermal/thermal-generic-adc.c | 182 ++++++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+) create mode 100644 drivers/thermal/thermal-generic-adc.c (limited to 'drivers/thermal/Kconfig') diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index ee02e6021c94..4166c10ba314 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -411,4 +411,14 @@ config QCOM_SPMI_TEMP_ALARM real time die temperature if an ADC is present or an estimate of the temperature based upon the over temperature stage value. +config GENERIC_ADC_THERMAL + tristate "Generic ADC based thermal sensor" + depends on IIO + help + This enabled a thermal sysfs driver for the temperature sensor + which is connected to the General Purpose ADC. The ADC channel + is read via IIO framework and the channel information is provided + to this driver. This driver reports the temperature by reading ADC + channel and converts it to temperature based on lookup table. + endif diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 998134ff3b45..10b07c14f8a9 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -50,3 +50,4 @@ obj-$(CONFIG_ST_THERMAL) += st/ obj-$(CONFIG_TEGRA_SOCTHERM) += tegra/ obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o +obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o diff --git a/drivers/thermal/thermal-generic-adc.c b/drivers/thermal/thermal-generic-adc.c new file mode 100644 index 000000000000..73f55d6a1721 --- /dev/null +++ b/drivers/thermal/thermal-generic-adc.c @@ -0,0 +1,182 @@ +/* + * Generic ADC thermal driver + * + * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved. + * + * Author: Laxman Dewangan + * + * 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 +#include +#include +#include +#include +#include + +struct gadc_thermal_info { + struct device *dev; + struct thermal_zone_device *tz_dev; + struct iio_channel *channel; + s32 *lookup_table; + int nlookup_table; +}; + +static int gadc_thermal_adc_to_temp(struct gadc_thermal_info *gti, int val) +{ + int temp, adc_hi, adc_lo; + int i; + + for (i = 0; i < gti->nlookup_table; i++) { + if (val >= gti->lookup_table[2 * i + 1]) + break; + } + + if (i == 0) { + temp = gti->lookup_table[0]; + } else if (i >= (gti->nlookup_table - 1)) { + temp = gti->lookup_table[2 * (gti->nlookup_table - 1)]; + } else { + adc_hi = gti->lookup_table[2 * i - 1]; + adc_lo = gti->lookup_table[2 * i + 1]; + temp = gti->lookup_table[2 * i]; + temp -= ((val - adc_lo) * 1000) / (adc_hi - adc_lo); + } + + return temp; +} + +static int gadc_thermal_get_temp(void *data, int *temp) +{ + struct gadc_thermal_info *gti = data; + int val; + int ret; + + ret = iio_read_channel_processed(gti->channel, &val); + if (ret < 0) { + dev_err(gti->dev, "IIO channel read failed %d\n", ret); + return ret; + } + *temp = gadc_thermal_adc_to_temp(gti, val); + + return 0; +} + +static const struct thermal_zone_of_device_ops gadc_thermal_ops = { + .get_temp = gadc_thermal_get_temp, +}; + +static int gadc_thermal_read_linear_lookup_table(struct device *dev, + struct gadc_thermal_info *gti) +{ + struct device_node *np = dev->of_node; + int ntable; + int ret; + + ntable = of_property_count_elems_of_size(np, "temperature-lookup-table", + sizeof(u32)); + if (ntable < 0) { + dev_err(dev, "Lookup table is not provided\n"); + return ntable; + } + + if (ntable % 2) { + dev_err(dev, "Pair of temperature vs ADC read value missing\n"); + return -EINVAL; + } + + gti->lookup_table = devm_kzalloc(dev, sizeof(*gti->lookup_table) * + ntable, GFP_KERNEL); + if (!gti->lookup_table) + return -ENOMEM; + + ret = of_property_read_u32_array(np, "temperature-lookup-table", + (u32 *)gti->lookup_table, ntable); + if (ret < 0) { + dev_err(dev, "Failed to read temperature lookup table: %d\n", + ret); + return ret; + } + + gti->nlookup_table = ntable / 2; + + return 0; +} + +static int gadc_thermal_probe(struct platform_device *pdev) +{ + struct gadc_thermal_info *gti; + int ret; + + if (!pdev->dev.of_node) { + dev_err(&pdev->dev, "Only DT based supported\n"); + return -ENODEV; + } + + gti = devm_kzalloc(&pdev->dev, sizeof(*gti), GFP_KERNEL); + if (!gti) + return -ENOMEM; + + ret = gadc_thermal_read_linear_lookup_table(&pdev->dev, gti); + if (ret < 0) + return ret; + + gti->dev = &pdev->dev; + platform_set_drvdata(pdev, gti); + + gti->channel = iio_channel_get(&pdev->dev, "sensor-channel"); + if (IS_ERR(gti->channel)) { + ret = PTR_ERR(gti->channel); + dev_err(&pdev->dev, "IIO channel not found: %d\n", ret); + return ret; + } + + gti->tz_dev = thermal_zone_of_sensor_register(&pdev->dev, 0, + gti, &gadc_thermal_ops); + if (IS_ERR(gti->tz_dev)) { + ret = PTR_ERR(gti->tz_dev); + dev_err(&pdev->dev, "Thermal zone sensor register failed: %d\n", + ret); + goto sensor_fail; + } + + return 0; + +sensor_fail: + iio_channel_release(gti->channel); + + return ret; +} + +static int gadc_thermal_remove(struct platform_device *pdev) +{ + struct gadc_thermal_info *gti = platform_get_drvdata(pdev); + + thermal_zone_of_sensor_unregister(&pdev->dev, gti->tz_dev); + iio_channel_release(gti->channel); + + return 0; +} + +static const struct of_device_id of_adc_thermal_match[] = { + { .compatible = "generic-adc-thermal", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_adc_thermal_match); + +static struct platform_driver gadc_thermal_driver = { + .driver = { + .name = "generic-adc-thermal", + .of_match_table = of_adc_thermal_match, + }, + .probe = gadc_thermal_probe, + .remove = gadc_thermal_remove, +}; + +module_platform_driver(gadc_thermal_driver); + +MODULE_AUTHOR("Laxman Dewangan "); +MODULE_DESCRIPTION("Generic ADC thermal driver using IIO framework with DT"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3