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linux-next/drivers/thermal/spear_thermal.c
Thomas Gleixner 9c92ab6191 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 285 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

186 lines
4.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* SPEAr thermal driver.
*
* Copyright (C) 2011-2012 ST Microelectronics
* Author: Vincenzo Frascino <vincenzo.frascino@st.com>
*/
#include <linux/clk.h>
#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 MD_FACTOR 1000
/* SPEAr Thermal Sensor Dev Structure */
struct spear_thermal_dev {
/* pointer to base address of the thermal sensor */
void __iomem *thermal_base;
/* clk structure */
struct clk *clk;
/* pointer to thermal flags */
unsigned int flags;
};
static inline int thermal_get_temp(struct thermal_zone_device *thermal,
int *temp)
{
struct spear_thermal_dev *stdev = thermal->devdata;
/*
* Data are ready to be read after 628 usec from POWERDOWN signal
* (PDN) = 1
*/
*temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;
return 0;
}
static struct thermal_zone_device_ops ops = {
.get_temp = thermal_get_temp,
};
static int __maybe_unused spear_thermal_suspend(struct device *dev)
{
struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
struct spear_thermal_dev *stdev = spear_thermal->devdata;
unsigned int actual_mask = 0;
/* Disable SPEAr Thermal Sensor */
actual_mask = readl_relaxed(stdev->thermal_base);
writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
clk_disable(stdev->clk);
dev_info(dev, "Suspended.\n");
return 0;
}
static int __maybe_unused spear_thermal_resume(struct device *dev)
{
struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
struct spear_thermal_dev *stdev = spear_thermal->devdata;
unsigned int actual_mask = 0;
int ret = 0;
ret = clk_enable(stdev->clk);
if (ret) {
dev_err(dev, "Can't enable clock\n");
return ret;
}
/* Enable SPEAr Thermal Sensor */
actual_mask = readl_relaxed(stdev->thermal_base);
writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base);
dev_info(dev, "Resumed.\n");
return 0;
}
static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend,
spear_thermal_resume);
static int spear_thermal_probe(struct platform_device *pdev)
{
struct thermal_zone_device *spear_thermal = NULL;
struct spear_thermal_dev *stdev;
struct device_node *np = pdev->dev.of_node;
struct resource *res;
int ret = 0, val;
if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {
dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
return -EINVAL;
}
stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
if (!stdev)
return -ENOMEM;
/* Enable thermal sensor */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(stdev->thermal_base))
return PTR_ERR(stdev->thermal_base);
stdev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(stdev->clk)) {
dev_err(&pdev->dev, "Can't get clock\n");
return PTR_ERR(stdev->clk);
}
ret = clk_enable(stdev->clk);
if (ret) {
dev_err(&pdev->dev, "Can't enable clock\n");
return ret;
}
stdev->flags = val;
writel_relaxed(stdev->flags, stdev->thermal_base);
spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
stdev, &ops, NULL, 0, 0);
if (IS_ERR(spear_thermal)) {
dev_err(&pdev->dev, "thermal zone device is NULL\n");
ret = PTR_ERR(spear_thermal);
goto disable_clk;
}
platform_set_drvdata(pdev, spear_thermal);
dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",
stdev->thermal_base);
return 0;
disable_clk:
clk_disable(stdev->clk);
return ret;
}
static int spear_thermal_exit(struct platform_device *pdev)
{
unsigned int actual_mask = 0;
struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
struct spear_thermal_dev *stdev = spear_thermal->devdata;
thermal_zone_device_unregister(spear_thermal);
/* Disable SPEAr Thermal Sensor */
actual_mask = readl_relaxed(stdev->thermal_base);
writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
clk_disable(stdev->clk);
return 0;
}
static const struct of_device_id spear_thermal_id_table[] = {
{ .compatible = "st,thermal-spear1340" },
{}
};
MODULE_DEVICE_TABLE(of, spear_thermal_id_table);
static struct platform_driver spear_thermal_driver = {
.probe = spear_thermal_probe,
.remove = spear_thermal_exit,
.driver = {
.name = "spear_thermal",
.pm = &spear_thermal_pm_ops,
.of_match_table = spear_thermal_id_table,
},
};
module_platform_driver(spear_thermal_driver);
MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
MODULE_DESCRIPTION("SPEAr thermal driver");
MODULE_LICENSE("GPL");