thermal: add support for thermal sensor present on SPEAr13xx machines
ST's SPEAr13xx machines are based on CortexA9 ARM processors. These machines contain a thermal sensor for junction temperature monitoring. This patch adds support for this thermal sensor in existing thermal framework. [akpm@linux-foundation.org: little code cleanup] [akpm@linux-foundation.org: print the pointer correctly] [viresh.kumar@st.com: thermal/spear_thermal: add compilation dependency on PLAT_SPEAR] Signed-off-by: Vincenzo Frascino <vincenzo.frascino@st.com> Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Vincenzo Frascino
Len Brown
parent
c5a01dd52d
commit
6a92c36688
4 changed files with 241 additions and 0 deletions
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@ -18,3 +18,11 @@ config THERMAL_HWMON
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depends on THERMAL
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depends on HWMON=y || HWMON=THERMAL
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default y
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config SPEAR_THERMAL
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bool "SPEAr thermal sensor driver"
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depends on THERMAL
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depends on PLAT_SPEAR
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help
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Enable this to plug the SPEAr thermal sensor driver into the Linux
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thermal framework
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@ -3,3 +3,4 @@
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#
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obj-$(CONFIG_THERMAL) += thermal_sys.o
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obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
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206
drivers/thermal/spear_thermal.c
Normal file
206
drivers/thermal/spear_thermal.c
Normal file
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@ -0,0 +1,206 @@
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/*
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* SPEAr thermal driver.
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*
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* Copyright (C) 2011-2012 ST Microelectronics
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* Author: Vincenzo Frascino <vincenzo.frascino@st.com>
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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/clk.h>
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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/module.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/spear_thermal.h>
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#include <linux/thermal.h>
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#define MD_FACTOR 1000
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/* SPEAr Thermal Sensor Dev Structure */
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struct spear_thermal_dev {
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/* pointer to base address of the thermal sensor */
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void __iomem *thermal_base;
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/* clk structure */
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struct clk *clk;
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/* pointer to thermal flags */
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unsigned int flags;
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};
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static inline int thermal_get_temp(struct thermal_zone_device *thermal,
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unsigned long *temp)
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{
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struct spear_thermal_dev *stdev = thermal->devdata;
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/*
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* Data are ready to be read after 628 usec from POWERDOWN signal
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* (PDN) = 1
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*/
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*temp = (readl(stdev->thermal_base) & 0x7F) * MD_FACTOR;
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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 = thermal_get_temp,
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};
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#ifdef CONFIG_PM
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static int spear_thermal_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
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struct spear_thermal_dev *stdev = spear_thermal->devdata;
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unsigned int actual_mask = 0;
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/* Disable SPEAr Thermal Sensor */
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actual_mask = readl(stdev->thermal_base);
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writel(actual_mask & ~stdev->flags, stdev->thermal_base);
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clk_disable(stdev->clk);
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dev_info(dev, "Suspended.\n");
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return 0;
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}
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static int spear_thermal_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
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struct spear_thermal_dev *stdev = spear_thermal->devdata;
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unsigned int actual_mask = 0;
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int ret = 0;
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ret = clk_enable(stdev->clk);
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if (ret) {
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dev_err(&pdev->dev, "Can't enable clock\n");
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return ret;
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}
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/* Enable SPEAr Thermal Sensor */
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actual_mask = readl(stdev->thermal_base);
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writel(actual_mask | stdev->flags, stdev->thermal_base);
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dev_info(dev, "Resumed.\n");
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend,
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spear_thermal_resume);
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static int spear_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *spear_thermal = NULL;
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struct spear_thermal_dev *stdev;
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struct spear_thermal_pdata *pdata;
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int ret = 0;
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struct resource *stres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!stres) {
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dev_err(&pdev->dev, "memory resource missing\n");
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return -ENODEV;
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}
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata) {
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dev_err(&pdev->dev, "platform data is NULL\n");
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return -EINVAL;
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}
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stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
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if (!stdev) {
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dev_err(&pdev->dev, "kzalloc fail\n");
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return -ENOMEM;
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}
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/* Enable thermal sensor */
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stdev->thermal_base = devm_ioremap(&pdev->dev, stres->start,
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resource_size(stres));
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if (!stdev->thermal_base) {
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dev_err(&pdev->dev, "ioremap failed\n");
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return -ENOMEM;
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}
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stdev->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(stdev->clk)) {
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dev_err(&pdev->dev, "Can't get clock\n");
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return PTR_ERR(stdev->clk);
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}
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ret = clk_enable(stdev->clk);
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if (ret) {
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dev_err(&pdev->dev, "Can't enable clock\n");
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goto put_clk;
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}
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stdev->flags = pdata->thermal_flags;
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writel(stdev->flags, stdev->thermal_base);
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spear_thermal = thermal_zone_device_register("spear_thermal", 0,
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stdev, &ops, 0, 0, 0, 0);
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if (!spear_thermal) {
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dev_err(&pdev->dev, "thermal zone device is NULL\n");
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ret = -EINVAL;
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goto disable_clk;
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}
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platform_set_drvdata(pdev, spear_thermal);
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dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",
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stdev->thermal_base);
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return 0;
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disable_clk:
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clk_disable(stdev->clk);
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put_clk:
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clk_put(stdev->clk);
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return ret;
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}
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static int spear_thermal_exit(struct platform_device *pdev)
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{
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unsigned int actual_mask = 0;
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struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
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struct spear_thermal_dev *stdev = spear_thermal->devdata;
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thermal_zone_device_unregister(spear_thermal);
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platform_set_drvdata(pdev, NULL);
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/* Disable SPEAr Thermal Sensor */
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actual_mask = readl(stdev->thermal_base);
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writel(actual_mask & ~stdev->flags, stdev->thermal_base);
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clk_disable(stdev->clk);
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clk_put(stdev->clk);
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return 0;
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}
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static struct platform_driver spear_thermal_driver = {
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.probe = spear_thermal_probe,
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.remove = spear_thermal_exit,
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.driver = {
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.name = "spear_thermal",
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.owner = THIS_MODULE,
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.pm = &spear_thermal_pm_ops,
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},
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};
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module_platform_driver(spear_thermal_driver);
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MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
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MODULE_DESCRIPTION("SPEAr thermal driver");
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MODULE_LICENSE("GPL");
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26
include/linux/platform_data/spear_thermal.h
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26
include/linux/platform_data/spear_thermal.h
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@ -0,0 +1,26 @@
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/*
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* SPEAr thermal driver platform data.
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*
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* Copyright (C) 2011-2012 ST Microelectronics
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* Author: Vincenzo Frascino <vincenzo.frascino@st.com>
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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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#ifndef SPEAR_THERMAL_H
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#define SPEAR_THERMAL_H
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/* SPEAr Thermal Sensor Platform Data */
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struct spear_thermal_pdata {
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/* flags used to enable thermal sensor */
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unsigned int thermal_flags;
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};
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#endif /* SPEAR_THERMAL_H */
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