Thermal: Dove: Add Themal sensor support for Dove.
The Marvell Dove SoC has a thermal sensor. Add a driver using the thermal framework. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
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* Dove Thermal
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This driver is for Dove SoCs which contain a thermal sensor.
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Required properties:
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- compatible : "marvell,dove-thermal"
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- reg : Address range of the thermal registers
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The reg properties should contain two ranges. The first is for the
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three Thermal Manager registers, while the second range contains the
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Thermal Diode Control Registers.
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Example:
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thermal@10078 {
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compatible = "marvell,dove-thermal";
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reg = <0xd001c 0x0c>, <0xd005c 0x08>;
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};
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@ -126,6 +126,14 @@ config EXYNOS_THERMAL_EMUL
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device directory to support emulation mode. With emulation mode sysfs
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device directory to support emulation mode. With emulation mode sysfs
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node, you can manually input temperature to TMU for simulation purpose.
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node, you can manually input temperature to TMU for simulation purpose.
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config DOVE_THERMAL
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tristate "Temperature sensor on Marvell Dove SoCs"
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depends on ARCH_DOVE
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depends on OF
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help
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Support for the Dove thermal sensor driver in the Linux thermal
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framework.
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config DB8500_THERMAL
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config DB8500_THERMAL
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bool "DB8500 thermal management"
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bool "DB8500 thermal management"
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depends on ARCH_U8500
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depends on ARCH_U8500
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@ -17,6 +17,7 @@ obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
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obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
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obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
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obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
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obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
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obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
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obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
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obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o
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obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
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obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
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obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
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obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
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obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
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obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
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/*
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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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unsigned long *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. See Section 8.10.1 of 88AP510,
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* Documentation/arm/Marvell/README
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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 = ((2281638UL - (7298*reg)) / 10);
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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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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get platform resource\n");
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return -ENODEV;
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}
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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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priv->sensor = devm_request_and_ioremap(&pdev->dev, res);
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if (!priv->sensor) {
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dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
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return -EADDRNOTAVAIL;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get platform resource\n");
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return -ENODEV;
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}
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priv->control = devm_request_and_ioremap(&pdev->dev, res);
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if (!priv->control) {
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dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
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return -EADDRNOTAVAIL;
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}
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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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platform_set_drvdata(pdev, NULL);
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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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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(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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