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Message-ID: <89c4a85d-fbc7-6fcf-6ff4-63c5580837f8@roeck-us.net>
Date: Sun, 10 Sep 2017 08:17:59 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Andreas Färber <afaerber@...e.de>,
Wim Van Sebroeck <wim@...ana.be>,
linux-watchdog@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, Roc He <hepeng@...oo.tv>,
蒋丽琴 <jiang.liqin@...iatech.com>
Subject: Re: [PATCH v2 2/3] watchdog: Add Realtek RTD1295
On 09/04/2017 04:16 PM, Andreas Färber wrote:
> 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@...e.de>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v1 -> v2:
> * Added explicit include of bitops.h (Guenther)
> * Set timeout field in set_timeout (Guenther)
> * Implemented remove (Guenther)
> * Replaced remaining hardcoded frequency with clk_get_rate()
>
> drivers/watchdog/Kconfig | 10 +++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/rtd119x_wdt.c | 168 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 179 insertions(+)
> create mode 100644 drivers/watchdog/rtd119x_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index c722cbfdc7e6..8fa81518c3fa 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -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
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 56adf9fa67d0..63cb3ed8117d 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -87,6 +87,7 @@ 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
> diff --git a/drivers/watchdog/rtd119x_wdt.c b/drivers/watchdog/rtd119x_wdt.c
> new file mode 100644
> index 000000000000..d001c17ddfde
> --- /dev/null
> +++ b/drivers/watchdog/rtd119x_wdt.c
> @@ -0,0 +1,168 @@
> +/*
> + * 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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