linux/drivers/watchdog/rtd119x_wdt.c
Bagas Sanjaya a0d261ccd7 watchdog: Convert GPL 2.0 notice to SPDX identifier
Convert the boilerplate to SPDX license identifier. While at it, also
move SPDX identifier for drivers/watchdog/rtd119x_wdt.c to the top of
file (as in other files).

Cc: Ray Lehtiniemi <rayl@mail.com>,
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Deepak Saxena <dsaxena@plexity.net>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Jonas Jensen <jonas.jensen@gmail.com>
Cc: Sylver Bruneau <sylver.bruneau@googlemail.com>
Cc: Denis Turischev <denis@compulab.co.il>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Ray Lehtiniemi <rayl@mail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lkml.kernel.org/r/20230517072140.1086660-2-bagasdotme@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2023-06-26 14:30:04 +02:00

140 lines
3.4 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Realtek RTD129x watchdog
*
* Copyright (c) 2017 Andreas Färber
*
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#define RTD119X_TCWCR 0x0
#define RTD119X_TCWTR 0x4
#define RTD119X_TCWOV 0xc
#define RTD119X_TCWCR_WDEN_DISABLED 0xa5
#define RTD119X_TCWCR_WDEN_ENABLED 0xff
#define RTD119X_TCWCR_WDEN_MASK 0xff
#define RTD119X_TCWTR_WDCLR BIT(0)
struct rtd119x_watchdog_device {
struct watchdog_device wdt_dev;
void __iomem *base;
struct clk *clk;
};
static int rtd119x_wdt_start(struct watchdog_device *wdev)
{
struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
u32 val;
val = readl_relaxed(data->base + RTD119X_TCWCR);
val &= ~RTD119X_TCWCR_WDEN_MASK;
val |= RTD119X_TCWCR_WDEN_ENABLED;
writel(val, data->base + RTD119X_TCWCR);
return 0;
}
static int rtd119x_wdt_stop(struct watchdog_device *wdev)
{
struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
u32 val;
val = readl_relaxed(data->base + RTD119X_TCWCR);
val &= ~RTD119X_TCWCR_WDEN_MASK;
val |= RTD119X_TCWCR_WDEN_DISABLED;
writel(val, data->base + RTD119X_TCWCR);
return 0;
}
static int rtd119x_wdt_ping(struct watchdog_device *wdev)
{
struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
writel_relaxed(RTD119X_TCWTR_WDCLR, data->base + RTD119X_TCWTR);
return rtd119x_wdt_start(wdev);
}
static int rtd119x_wdt_set_timeout(struct watchdog_device *wdev, unsigned int val)
{
struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
writel(val * clk_get_rate(data->clk), data->base + RTD119X_TCWOV);
data->wdt_dev.timeout = val;
return 0;
}
static const struct watchdog_ops rtd119x_wdt_ops = {
.owner = THIS_MODULE,
.start = rtd119x_wdt_start,
.stop = rtd119x_wdt_stop,
.ping = rtd119x_wdt_ping,
.set_timeout = rtd119x_wdt_set_timeout,
};
static const struct watchdog_info rtd119x_wdt_info = {
.identity = "rtd119x-wdt",
.options = 0,
};
static const struct of_device_id rtd119x_wdt_dt_ids[] = {
{ .compatible = "realtek,rtd1295-watchdog" },
{ }
};
static int rtd119x_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rtd119x_watchdog_device *data;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(data->base))
return PTR_ERR(data->base);
data->clk = devm_clk_get_enabled(dev, NULL);
if (IS_ERR(data->clk))
return PTR_ERR(data->clk);
data->wdt_dev.info = &rtd119x_wdt_info;
data->wdt_dev.ops = &rtd119x_wdt_ops;
data->wdt_dev.timeout = 120;
data->wdt_dev.max_timeout = 0xffffffff / clk_get_rate(data->clk);
data->wdt_dev.min_timeout = 1;
data->wdt_dev.parent = dev;
watchdog_stop_on_reboot(&data->wdt_dev);
watchdog_set_drvdata(&data->wdt_dev, data);
platform_set_drvdata(pdev, data);
writel_relaxed(RTD119X_TCWTR_WDCLR, data->base + RTD119X_TCWTR);
rtd119x_wdt_set_timeout(&data->wdt_dev, data->wdt_dev.timeout);
rtd119x_wdt_stop(&data->wdt_dev);
return devm_watchdog_register_device(dev, &data->wdt_dev);
}
static struct platform_driver rtd119x_wdt_driver = {
.probe = rtd119x_wdt_probe,
.driver = {
.name = "rtd1295-watchdog",
.of_match_table = rtd119x_wdt_dt_ids,
},
};
builtin_platform_driver(rtd119x_wdt_driver);