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: Andreas Färber <afaerber@suse.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
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@ -787,6 +787,16 @@ config UNIPHIER_WATCHDOG
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To compile this driver as a module, choose M here: the
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module will be called uniphier_wdt.
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config RTD119X_WATCHDOG
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bool "Realtek RTD119x/RTD129x watchdog support"
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depends on ARCH_REALTEK || COMPILE_TEST
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depends on OF
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select WATCHDOG_CORE
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default ARCH_REALTEK
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help
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Say Y here to include support for the watchdog timer in
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Realtek RTD1295 SoCs.
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# AVR32 Architecture
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config AT32AP700X_WDT
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@ -88,6 +88,7 @@ obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
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obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o
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obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o
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obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
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obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
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# AVR32 Architecture
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obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
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168
drivers/watchdog/rtd119x_wdt.c
Normal file
168
drivers/watchdog/rtd119x_wdt.c
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@ -0,0 +1,168 @@
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/*
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* Realtek RTD129x watchdog
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*
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* Copyright (c) 2017 Andreas Färber
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#define RTD119X_TCWCR 0x0
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#define RTD119X_TCWTR 0x4
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#define RTD119X_TCWOV 0xc
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#define RTD119X_TCWCR_WDEN_DISABLED 0xa5
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#define RTD119X_TCWCR_WDEN_ENABLED 0xff
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#define RTD119X_TCWCR_WDEN_MASK 0xff
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#define RTD119X_TCWTR_WDCLR BIT(0)
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struct rtd119x_watchdog_device {
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struct watchdog_device wdt_dev;
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void __iomem *base;
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struct clk *clk;
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};
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static int rtd119x_wdt_start(struct watchdog_device *wdev)
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{
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struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
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u32 val;
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val = readl_relaxed(data->base + RTD119X_TCWCR);
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val &= ~RTD119X_TCWCR_WDEN_MASK;
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val |= RTD119X_TCWCR_WDEN_ENABLED;
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writel(val, data->base + RTD119X_TCWCR);
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return 0;
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}
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static int rtd119x_wdt_stop(struct watchdog_device *wdev)
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{
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struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
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u32 val;
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val = readl_relaxed(data->base + RTD119X_TCWCR);
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val &= ~RTD119X_TCWCR_WDEN_MASK;
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val |= RTD119X_TCWCR_WDEN_DISABLED;
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writel(val, data->base + RTD119X_TCWCR);
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return 0;
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}
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static int rtd119x_wdt_ping(struct watchdog_device *wdev)
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{
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struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
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writel_relaxed(RTD119X_TCWTR_WDCLR, data->base + RTD119X_TCWTR);
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return rtd119x_wdt_start(wdev);
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}
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static int rtd119x_wdt_set_timeout(struct watchdog_device *wdev, unsigned int val)
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{
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struct rtd119x_watchdog_device *data = watchdog_get_drvdata(wdev);
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writel(val * clk_get_rate(data->clk), data->base + RTD119X_TCWOV);
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data->wdt_dev.timeout = val;
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return 0;
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}
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static const struct watchdog_ops rtd119x_wdt_ops = {
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.owner = THIS_MODULE,
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.start = rtd119x_wdt_start,
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.stop = rtd119x_wdt_stop,
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.ping = rtd119x_wdt_ping,
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.set_timeout = rtd119x_wdt_set_timeout,
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};
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static const struct watchdog_info rtd119x_wdt_info = {
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.identity = "rtd119x-wdt",
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.options = 0,
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};
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static const struct of_device_id rtd119x_wdt_dt_ids[] = {
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{ .compatible = "realtek,rtd1295-watchdog" },
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{ }
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};
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static int rtd119x_wdt_probe(struct platform_device *pdev)
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{
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struct rtd119x_watchdog_device *data;
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struct resource *res;
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int ret;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(data->base))
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return PTR_ERR(data->base);
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data->clk = of_clk_get(pdev->dev.of_node, 0);
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if (IS_ERR(data->clk))
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return PTR_ERR(data->clk);
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ret = clk_prepare_enable(data->clk);
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if (ret) {
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clk_put(data->clk);
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return ret;
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}
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data->wdt_dev.info = &rtd119x_wdt_info;
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data->wdt_dev.ops = &rtd119x_wdt_ops;
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data->wdt_dev.timeout = 120;
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data->wdt_dev.max_timeout = 0xffffffff / clk_get_rate(data->clk);
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data->wdt_dev.min_timeout = 1;
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data->wdt_dev.parent = &pdev->dev;
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watchdog_stop_on_reboot(&data->wdt_dev);
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watchdog_set_drvdata(&data->wdt_dev, data);
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platform_set_drvdata(pdev, data);
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writel_relaxed(RTD119X_TCWTR_WDCLR, data->base + RTD119X_TCWTR);
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rtd119x_wdt_set_timeout(&data->wdt_dev, data->wdt_dev.timeout);
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rtd119x_wdt_stop(&data->wdt_dev);
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ret = devm_watchdog_register_device(&pdev->dev, &data->wdt_dev);
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if (ret) {
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clk_disable_unprepare(data->clk);
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clk_put(data->clk);
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return ret;
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}
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return 0;
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}
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static int rtd119x_wdt_remove(struct platform_device *pdev)
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{
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struct rtd119x_watchdog_device *data = platform_get_drvdata(pdev);
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watchdog_unregister_device(&data->wdt_dev);
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clk_disable_unprepare(data->clk);
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clk_put(data->clk);
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return 0;
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}
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static struct platform_driver rtd119x_wdt_driver = {
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.probe = rtd119x_wdt_probe,
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.remove = rtd119x_wdt_remove,
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.driver = {
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.name = "rtd1295-watchdog",
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.of_match_table = rtd119x_wdt_dt_ids,
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},
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};
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builtin_platform_driver(rtd119x_wdt_driver);
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