[PATCH v5 3/4] Thermal: Dove: Add Themal sensor support for Dove.

[rui.zhang@intel.com (Zhang Rui)]

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@lunn.ch>
> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@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@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@lunn.ch>");
> +MODULE_DESCRIPTION("Dove thermal driver");
> +MODULE_LICENSE("GPL");