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![Sascha Hauer](/assets/img/avatar_default.png)
The thermal code uses int, long and unsigned long for temperatures in different places. Using an unsigned type limits the thermal framework to positive temperatures without need. Also several drivers currently will report temperatures near UINT_MAX for temperatures below 0°C. This will probably immediately shut the machine down due to overtemperature if started below 0°C. 'long' is 64bit on several architectures. This is not needed since INT_MAX °mC is above the melting point of all known materials. Consistently use a plain 'int' for temperatures throughout the thermal code and the drivers. This only changes the places in the drivers where the temperature is passed around as pointer, when drivers internally use another type this is not changed. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Lukasz Majewski <l.majewski@samsung.com> Reviewed-by: Darren Hart <dvhart@linux.intel.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Peter Feuerer <peter@piie.net> Cc: Punit Agrawal <punit.agrawal@arm.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Jean Delvare <jdelvare@suse.de> Cc: Peter Feuerer <peter@piie.net> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Lukasz Majewski <l.majewski@samsung.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: linux-acpi@vger.kernel.org Cc: platform-driver-x86@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: Guenter Roeck <linux@roeck-us.net> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Darren Hart <dvhart@infradead.org> Cc: lm-sensors@lm-sensors.org Signed-off-by: Zhang Rui <rui.zhang@intel.com>
195 lines
5 KiB
C
195 lines
5 KiB
C
/*
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* Dove thermal sensor driver
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*
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* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#define DOVE_THERMAL_TEMP_OFFSET 1
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#define DOVE_THERMAL_TEMP_MASK 0x1FF
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/* Dove Thermal Manager Control and Status Register */
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#define PMU_TM_DISABLE_OFFS 0
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#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
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/* Dove Theraml Diode Control 0 Register */
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#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
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#define PMU_TDC0_SEL_VCAL_OFFS 5
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#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
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#define PMU_TDC0_REF_CAL_CNT_OFFS 11
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#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
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#define PMU_TDC0_AVG_NUM_OFFS 25
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#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
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/* Dove Thermal Diode Control 1 Register */
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#define PMU_TEMP_DIOD_CTRL1_REG 0x04
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#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
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/* Dove Thermal Sensor Dev Structure */
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struct dove_thermal_priv {
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void __iomem *sensor;
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void __iomem *control;
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};
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static int dove_init_sensor(const struct dove_thermal_priv *priv)
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{
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u32 reg;
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u32 i;
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/* Configure the Diode Control Register #0 */
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reg = readl_relaxed(priv->control);
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/* Use average of 2 */
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reg &= ~PMU_TDC0_AVG_NUM_MASK;
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reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
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/* Reference calibration value */
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reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
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reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
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/* Set the high level reference for calibration */
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reg &= ~PMU_TDC0_SEL_VCAL_MASK;
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reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
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writel(reg, priv->control);
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/* Reset the sensor */
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reg = readl_relaxed(priv->control);
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writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
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writel(reg, priv->control);
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/* Enable the sensor */
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reg = readl_relaxed(priv->sensor);
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reg &= ~PMU_TM_DISABLE_MASK;
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writel(reg, priv->sensor);
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/* Poll the sensor for the first reading */
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for (i = 0; i < 1000000; i++) {
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reg = readl_relaxed(priv->sensor);
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if (reg & DOVE_THERMAL_TEMP_MASK)
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break;
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}
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if (i == 1000000)
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return -EIO;
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return 0;
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}
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static int dove_get_temp(struct thermal_zone_device *thermal,
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int *temp)
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{
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unsigned long reg;
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struct dove_thermal_priv *priv = thermal->devdata;
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/* Valid check */
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reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
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if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
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dev_err(&thermal->device,
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"Temperature sensor reading not valid\n");
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return -EIO;
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}
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/*
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* Calculate temperature. According to Marvell internal
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* documentation the formula for this is:
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* Celsius = (322-reg)/1.3625
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*/
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reg = readl_relaxed(priv->sensor);
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reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
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*temp = ((3220000000UL - (10000000UL * reg)) / 13625);
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return 0;
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}
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static struct thermal_zone_device_ops ops = {
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.get_temp = dove_get_temp,
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};
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static const struct of_device_id dove_thermal_id_table[] = {
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{ .compatible = "marvell,dove-thermal" },
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{}
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};
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static int dove_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *thermal = NULL;
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struct dove_thermal_priv *priv;
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struct resource *res;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->sensor = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->sensor))
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return PTR_ERR(priv->sensor);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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priv->control = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->control))
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return PTR_ERR(priv->control);
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ret = dove_init_sensor(priv);
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if (ret) {
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dev_err(&pdev->dev, "Failed to initialize sensor\n");
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return ret;
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}
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thermal = thermal_zone_device_register("dove_thermal", 0, 0,
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priv, &ops, NULL, 0, 0);
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if (IS_ERR(thermal)) {
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dev_err(&pdev->dev,
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"Failed to register thermal zone device\n");
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return PTR_ERR(thermal);
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}
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platform_set_drvdata(pdev, thermal);
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return 0;
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}
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static int dove_thermal_exit(struct platform_device *pdev)
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{
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struct thermal_zone_device *dove_thermal =
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platform_get_drvdata(pdev);
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thermal_zone_device_unregister(dove_thermal);
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return 0;
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}
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MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
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static struct platform_driver dove_thermal_driver = {
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.probe = dove_thermal_probe,
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.remove = dove_thermal_exit,
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.driver = {
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.name = "dove_thermal",
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.of_match_table = dove_thermal_id_table,
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},
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};
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module_platform_driver(dove_thermal_driver);
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MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
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MODULE_DESCRIPTION("Dove thermal driver");
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MODULE_LICENSE("GPL");
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