Commit 74ffa64c authored by Andrew Lunn's avatar Andrew Lunn Committed by Zhang Rui

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: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent 7060aa36
* 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@10078 {
compatible = "marvell,dove-thermal";
reg = <0xd001c 0x0c>, <0xd005c 0x08>;
};
......@@ -126,6 +126,14 @@ config EXYNOS_THERMAL_EMUL
device directory to support emulation mode. With emulation mode sysfs
node, you can manually input temperature to TMU for simulation purpose.
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
......
......@@ -17,6 +17,7 @@ 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-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
......
/*
* 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");
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