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

drivers/watchdog/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -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

drivers/watchdog/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/watchdog/rtd119x_wdt.c

0 → 100644
+168 −0
Original line number Diff line number Diff line 
/*

 * 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);