watchdog: Add Realtek RTD1295 (2bdf6acb) · Commits · 戴 / test

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);

Admin message