linux/drivers/watchdog/rtd119x_wdt.c

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/*
* Realtek RTD129x watchdog
*
* Copyright (c) 2017 Andreas Färber
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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;
watchdog: Convert to use devm_platform_ioremap_resource Use devm_platform_ioremap_resource to reduce source code size, improve readability, and reduce the likelyhood of bugs. The conversion was done automatically with coccinelle using the following semantic patch. @r@ identifier res, pdev; expression a; expression index; expression e; @@ <+... - res = platform_get_resource(pdev, IORESOURCE_MEM, index); - a = devm_ioremap_resource(e, res); + a = devm_platform_ioremap_resource(pdev, index); ...+> @depends on r@ identifier r.res; @@ - struct resource *res; ... when != res @@ identifier res, pdev; expression index; expression a; @@ - struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, index); - a = devm_ioremap_resource(&pdev->dev, res); + a = devm_platform_ioremap_resource(pdev, index); Cc: Joel Stanley <joel@jms.id.au> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Baruch Siach <baruch@tkos.co.il> Cc: Keguang Zhang <keguang.zhang@gmail.com> Cc: Vladimir Zapolskiy <vz@mleia.com> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Avi Fishman <avifishman70@gmail.com> Cc: Nancy Yuen <yuenn@google.com> Cc: Brendan Higgins <brendanhiggins@google.com> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Michal Simek <michal.simek@xilinx.com> Cc: Sylvain Lemieux <slemieux.tyco@gmail.com> Cc: Kukjin Kim <kgene@kernel.org> Cc: Barry Song <baohua@kernel.org> Cc: Orson Zhai <orsonzhai@gmail.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Maxime Ripard <maxime.ripard@bootlin.com> Cc: Chen-Yu Tsai <wens@csie.org> Cc: Marc Gonzalez <marc.w.gonzalez@free.fr> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Tested-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Maxime Ripard <maxime.ripard@bootlin.com> Acked-by: Michal Simek <michal.simek@xilinx.com> (cadence/xilinx wdts) Acked-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2019-04-02 22:01:53 +03:00
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);