Commit 7060aa36 authored by Nobuhiro Iwamatsu's avatar Nobuhiro Iwamatsu Committed by Zhang Rui

thermal: Add support for the thermal sensor on Kirkwood SoCs

This patch adds support for Kirkwood 88F6282 and 88F6283 thermal sensor.
Signed-off-by: default avatarNobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent 76cc1887
* Kirkwood Thermal
This version is for Kirkwood 88F8262 & 88F6283 SoCs. Other kirkwoods
don't contain a thermal sensor.
Required properties:
- compatible : "marvell,kirkwood-thermal"
- reg : Address range of the thermal registers
Example:
thermal@10078 {
compatible = "marvell,kirkwood-thermal";
reg = <0x10078 0x4>;
};
...@@ -101,6 +101,14 @@ config RCAR_THERMAL ...@@ -101,6 +101,14 @@ config RCAR_THERMAL
Enable this to plug the R-Car thermal sensor driver into the Linux Enable this to plug the R-Car thermal sensor driver into the Linux
thermal framework thermal framework
config KIRKWOOD_THERMAL
tristate "Temperature sensor on Marvell Kirkwood SoCs"
depends on ARCH_KIRKWOOD
depends on OF
help
Support for the Kirkwood thermal sensor driver into the Linux thermal
framework. Only kirkwood 88F6282 and 88F6283 have this sensor.
config EXYNOS_THERMAL config EXYNOS_THERMAL
tristate "Temperature sensor on Samsung EXYNOS" tristate "Temperature sensor on Samsung EXYNOS"
depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5) depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5)
......
...@@ -15,6 +15,7 @@ obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o ...@@ -15,6 +15,7 @@ obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
# platform thermal drivers # platform thermal drivers
obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
......
/*
* Kirkwood thermal sensor driver
*
* Copyright (C) 2012 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
*
* 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 KIRKWOOD_THERMAL_VALID_OFFSET 9
#define KIRKWOOD_THERMAL_VALID_MASK 0x1
#define KIRKWOOD_THERMAL_TEMP_OFFSET 10
#define KIRKWOOD_THERMAL_TEMP_MASK 0x1FF
/* Kirkwood Thermal Sensor Dev Structure */
struct kirkwood_thermal_priv {
void __iomem *sensor;
};
static int kirkwood_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
unsigned long reg;
struct kirkwood_thermal_priv *priv = thermal->devdata;
reg = readl_relaxed(priv->sensor);
/* Valid check */
if (!(reg >> KIRKWOOD_THERMAL_VALID_OFFSET) &
KIRKWOOD_THERMAL_VALID_MASK) {
dev_err(&thermal->device,
"Temperature sensor reading not valid\n");
return -EIO;
}
/*
* Calculate temperature. See Section 8.10.1 of the 88AP510,
* datasheet, which has the same sensor.
* Documentation/arm/Marvell/README
*/
reg = (reg >> KIRKWOOD_THERMAL_TEMP_OFFSET) &
KIRKWOOD_THERMAL_TEMP_MASK;
*temp = ((2281638UL - (7298*reg)) / 10);
return 0;
}
static struct thermal_zone_device_ops ops = {
.get_temp = kirkwood_get_temp,
};
static const struct of_device_id kirkwood_thermal_id_table[] = {
{ .compatible = "marvell,kirkwood-thermal" },
{}
};
static int kirkwood_thermal_probe(struct platform_device *pdev)
{
struct thermal_zone_device *thermal = NULL;
struct kirkwood_thermal_priv *priv;
struct resource *res;
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;
}
thermal = thermal_zone_device_register("kirkwood_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 kirkwood_thermal_exit(struct platform_device *pdev)
{
struct thermal_zone_device *kirkwood_thermal =
platform_get_drvdata(pdev);
thermal_zone_device_unregister(kirkwood_thermal);
platform_set_drvdata(pdev, NULL);
return 0;
}
MODULE_DEVICE_TABLE(of, kirkwood_thermal_id_table);
static struct platform_driver kirkwood_thermal_driver = {
.probe = kirkwood_thermal_probe,
.remove = kirkwood_thermal_exit,
.driver = {
.name = "kirkwood_thermal",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(kirkwood_thermal_id_table),
},
};
module_platform_driver(kirkwood_thermal_driver);
MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
MODULE_DESCRIPTION("kirkwood thermal driver");
MODULE_LICENSE("GPL");
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