Commit 2bdf6acb authored by Andreas Färber's avatar Andreas Färber Committed by Wim Van Sebroeck

watchdog: Add Realtek RTD1295

Add a watchdog driver for the Realtek RTD1295 SoC.

Based on QNAP's arch/arm/mach-rtk119x/driver/rtk_watchdog.c code and
mach-rtk119x/driver/dc2vo/fpga/include/iso_reg.h register defines.
Signed-off-by: default avatarAndreas Färber <afaerber@suse.de>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 5c06756c
......@@ -787,6 +787,16 @@ config UNIPHIER_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called uniphier_wdt.
config RTD119X_WATCHDOG
bool "Realtek RTD119x/RTD129x watchdog support"
depends on ARCH_REALTEK || COMPILE_TEST
depends on OF
select WATCHDOG_CORE
default ARCH_REALTEK
help
Say Y here to include support for the watchdog timer in
Realtek RTD1295 SoCs.
# AVR32 Architecture
config AT32AP700X_WDT
......
......@@ -88,6 +88,7 @@ obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o
obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o
obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
......
/*
* 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/module.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 rtd119x_watchdog_device *data;
struct resource *res;
int ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(data->base))
return PTR_ERR(data->base);
data->clk = of_clk_get(pdev->dev.of_node, 0);
if (IS_ERR(data->clk))
return PTR_ERR(data->clk);
ret = clk_prepare_enable(data->clk);
if (ret) {
clk_put(data->clk);
return ret;
}
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 = &pdev->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);
ret = devm_watchdog_register_device(&pdev->dev, &data->wdt_dev);
if (ret) {
clk_disable_unprepare(data->clk);
clk_put(data->clk);
return ret;
}
return 0;
}
static int rtd119x_wdt_remove(struct platform_device *pdev)
{
struct rtd119x_watchdog_device *data = platform_get_drvdata(pdev);
watchdog_unregister_device(&data->wdt_dev);
clk_disable_unprepare(data->clk);
clk_put(data->clk);
return 0;
}
static struct platform_driver rtd119x_wdt_driver = {
.probe = rtd119x_wdt_probe,
.remove = rtd119x_wdt_remove,
.driver = {
.name = "rtd1295-watchdog",
.of_match_table = rtd119x_wdt_dt_ids,
},
};
builtin_platform_driver(rtd119x_wdt_driver);
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