[PATCH v5 3/4] Thermal: Dove: Add Themal sensor support for Dove.
Zhang Rui
rui.zhang at intel.com
Fri Feb 8 02:25:07 EST 2013
On Wed, 2013-02-06 at 07:35 +0100, Andrew Lunn wrote:
> The Marvell Dove SoC has a thermal sensor. Add a driver using the
> thermal framework.
>
> Signed-off-by: Andrew Lunn <andrew at lunn.ch>
> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
applied to thermal -next.
thanks,
rui
> ---
> .../devicetree/bindings/thermal/dove-thermal.txt | 18 ++
> drivers/thermal/Kconfig | 8 +
> drivers/thermal/Makefile | 1 +
> drivers/thermal/dove_thermal.c | 209 ++++++++++++++++++++
> 4 files changed, 236 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/thermal/dove-thermal.txt
> create mode 100644 drivers/thermal/dove_thermal.c
>
> diff --git a/Documentation/devicetree/bindings/thermal/dove-thermal.txt b/Documentation/devicetree/bindings/thermal/dove-thermal.txt
> new file mode 100644
> index 0000000..6f47467
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/thermal/dove-thermal.txt
> @@ -0,0 +1,18 @@
> +* Dove Thermal
> +
> +This driver is for Dove SoCs which contain a thermal sensor.
> +
> +Required properties:
> +- compatible : "marvell,dove-thermal"
> +- reg : Address range of the thermal registers
> +
> +The reg properties should contain two ranges. The first is for the
> +three Thermal Manager registers, while the second range contains the
> +Thermal Diode Control Registers.
> +
> +Example:
> +
> + thermal at 10078 {
> + compatible = "marvell,dove-thermal";
> + reg = <0xd001c 0x0c>, <0xd005c 0x08>;
> + };
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index ff34a0a..342fd81 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -109,6 +109,14 @@ config EXYNOS_THERMAL
> If you say yes here you get support for TMU (Thermal Management
> Unit) on SAMSUNG EXYNOS series of SoC.
>
> +config DOVE_THERMAL
> + tristate "Temperature sensor on Marvell Dove SoCs"
> + depends on ARCH_DOVE
> + depends on OF
> + help
> + Support for the Dove thermal sensor driver in the Linux thermal
> + framework.
> +
> config DB8500_THERMAL
> bool "DB8500 thermal management"
> depends on ARCH_U8500
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 99026b2..5ed357e 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -17,5 +17,6 @@ obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
> obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
> obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
> obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
> +obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o
> obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
> obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
> diff --git a/drivers/thermal/dove_thermal.c b/drivers/thermal/dove_thermal.c
> new file mode 100644
> index 0000000..7b0bfa0
> --- /dev/null
> +++ b/drivers/thermal/dove_thermal.c
> @@ -0,0 +1,209 @@
> +/*
> + * Dove thermal sensor driver
> + *
> + * Copyright (C) 2013 Andrew Lunn <andrew at lunn.ch>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/thermal.h>
> +
> +#define DOVE_THERMAL_TEMP_OFFSET 1
> +#define DOVE_THERMAL_TEMP_MASK 0x1FF
> +
> +/* Dove Thermal Manager Control and Status Register */
> +#define PMU_TM_DISABLE_OFFS 0
> +#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
> +
> +/* Dove Theraml Diode Control 0 Register */
> +#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
> +#define PMU_TDC0_SEL_VCAL_OFFS 5
> +#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
> +#define PMU_TDC0_REF_CAL_CNT_OFFS 11
> +#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
> +#define PMU_TDC0_AVG_NUM_OFFS 25
> +#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
> +
> +/* Dove Thermal Diode Control 1 Register */
> +#define PMU_TEMP_DIOD_CTRL1_REG 0x04
> +#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
> +
> +/* Dove Thermal Sensor Dev Structure */
> +struct dove_thermal_priv {
> + void __iomem *sensor;
> + void __iomem *control;
> +};
> +
> +static int dove_init_sensor(const struct dove_thermal_priv *priv)
> +{
> + u32 reg;
> + u32 i;
> +
> + /* Configure the Diode Control Register #0 */
> + reg = readl_relaxed(priv->control);
> +
> + /* Use average of 2 */
> + reg &= ~PMU_TDC0_AVG_NUM_MASK;
> + reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
> +
> + /* Reference calibration value */
> + reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
> + reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
> +
> + /* Set the high level reference for calibration */
> + reg &= ~PMU_TDC0_SEL_VCAL_MASK;
> + reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
> + writel(reg, priv->control);
> +
> + /* Reset the sensor */
> + reg = readl_relaxed(priv->control);
> + writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
> + writel(reg, priv->control);
> +
> + /* Enable the sensor */
> + reg = readl_relaxed(priv->sensor);
> + reg &= ~PMU_TM_DISABLE_MASK;
> + writel(reg, priv->sensor);
> +
> + /* Poll the sensor for the first reading */
> + for (i = 0; i < 1000000; i++) {
> + reg = readl_relaxed(priv->sensor);
> + if (reg & DOVE_THERMAL_TEMP_MASK)
> + break;
> + }
> +
> + if (i == 1000000)
> + return -EIO;
> +
> + return 0;
> +}
> +
> +static int dove_get_temp(struct thermal_zone_device *thermal,
> + unsigned long *temp)
> +{
> + unsigned long reg;
> + struct dove_thermal_priv *priv = thermal->devdata;
> +
> + /* Valid check */
> + reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
> + if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
> + dev_err(&thermal->device,
> + "Temperature sensor reading not valid\n");
> + return -EIO;
> + }
> +
> + /*
> + * Calculate temperature. See Section 8.10.1 of 88AP510,
> + * Documentation/arm/Marvell/README
> + */
> + reg = readl_relaxed(priv->sensor);
> + reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
> + *temp = ((2281638UL - (7298*reg)) / 10);
> +
> + return 0;
> +}
> +
> +static struct thermal_zone_device_ops ops = {
> + .get_temp = dove_get_temp,
> +};
> +
> +static const struct of_device_id dove_thermal_id_table[] = {
> + { .compatible = "marvell,dove-thermal" },
> + {}
> +};
> +
> +static int dove_thermal_probe(struct platform_device *pdev)
> +{
> + struct thermal_zone_device *thermal = NULL;
> + struct dove_thermal_priv *priv;
> + struct resource *res;
> + int ret;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "Failed to get platform resource\n");
> + return -ENODEV;
> + }
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->sensor = devm_request_and_ioremap(&pdev->dev, res);
> + if (!priv->sensor) {
> + dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
> + return -EADDRNOTAVAIL;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + if (!res) {
> + dev_err(&pdev->dev, "Failed to get platform resource\n");
> + return -ENODEV;
> + }
> + priv->control = devm_request_and_ioremap(&pdev->dev, res);
> + if (!priv->control) {
> + dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
> + return -EADDRNOTAVAIL;
> + }
> +
> + ret = dove_init_sensor(priv);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to initialize sensor\n");
> + return ret;
> + }
> +
> + thermal = thermal_zone_device_register("dove_thermal", 0, 0,
> + priv, &ops, NULL, 0, 0);
> + if (IS_ERR(thermal)) {
> + dev_err(&pdev->dev,
> + "Failed to register thermal zone device\n");
> + return PTR_ERR(thermal);
> + }
> +
> + platform_set_drvdata(pdev, thermal);
> +
> + return 0;
> +}
> +
> +static int dove_thermal_exit(struct platform_device *pdev)
> +{
> + struct thermal_zone_device *dove_thermal =
> + platform_get_drvdata(pdev);
> +
> + thermal_zone_device_unregister(dove_thermal);
> + platform_set_drvdata(pdev, NULL);
> +
> + return 0;
> +}
> +
> +MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
> +
> +static struct platform_driver dove_thermal_driver = {
> + .probe = dove_thermal_probe,
> + .remove = dove_thermal_exit,
> + .driver = {
> + .name = "dove_thermal",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(dove_thermal_id_table),
> + },
> +};
> +
> +module_platform_driver(dove_thermal_driver);
> +
> +MODULE_AUTHOR("Andrew Lunn <andrew at lunn.ch>");
> +MODULE_DESCRIPTION("Dove thermal driver");
> +MODULE_LICENSE("GPL");
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