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Message-ID: <20130721073336.GA26485@roeck-us.net>
Date: Sun, 21 Jul 2013 00:33:36 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Jonas Jensen <jonas.jensen@...il.com>
Cc: linux-watchdog@...r.kernel.org, wim@...ana.be,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
arm@...nel.org
Subject: Re: [PATCH v4] watchdog: Add MOXA ART watchdog driver
On Fri, Jul 19, 2013 at 12:23:22PM +0200, Jonas Jensen wrote:
> Add watchdog driver for MOXA ART SoCs.
>
> Signed-off-by: Jonas Jensen <jonas.jensen@...il.com>
> ---
>
> Notes:
> v4 should fix remaining issues pointed out by Guenter.
>
> Changes since v3:
>
> 1. remove unnecessary header includes:
> linux/of.h
> linux/of_address.h
> linux/err.h
> linux/init.h
> linux/kernel.h,
> linux/moduleparam.h
> linux/types.h
> asm/system_misc.h
Seems you removed too many, but I'll need to have a closer look.
General guideline: If a definition from an include file is used, it must be
included. You can not depend on an include file being included from another
include file.
Thanks,
Guenter
> 2. move clock_frequency to moxart_wdt_dev
> 3. remove local pointer "void __iomem *wdt_base" use moxart_wdt->base instead
> 4. get clock_frequency from watchdog_get_drvdata
> 5. move max_timeout variable to moxart_wdt_probe
> 6. check for division by zero moxart_wdt->clock_frequency
> 7. if devm_kzalloc fails, return -ENOMEM instead of -EINVAL
>
> Applies to next-20130716
>
> .../bindings/watchdog/moxa,moxart-watchdog.txt | 15 ++
> drivers/watchdog/Kconfig | 10 ++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/moxart_wdt.c | 166 +++++++++++++++++++++
> 4 files changed, 192 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/watchdog/moxa,moxart-watchdog.txt
> create mode 100644 drivers/watchdog/moxart_wdt.c
>
> diff --git a/Documentation/devicetree/bindings/watchdog/moxa,moxart-watchdog.txt b/Documentation/devicetree/bindings/watchdog/moxa,moxart-watchdog.txt
> new file mode 100644
> index 0000000..5507f2b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/moxa,moxart-watchdog.txt
> @@ -0,0 +1,15 @@
> +MOXA ART Watchdog timer
> +
> +Required properties:
> +
> +- compatible : Should be "moxa,moxart-watchdog"
> +- reg : Should contain registers location and length
> +- clocks : Should contain phandle for the MOXA ART core clock "coreclk"
> +
> +Example:
> +
> + watchdog: watchdog@...00000 {
> + compatible = "moxa,moxart-watchdog";
> + reg = <0x98500000 0x10>;
> + clocks = <&coreclk>;
> + };
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 362085d..6883aab 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -382,6 +382,16 @@ config RETU_WATCHDOG
> To compile this driver as a module, choose M here: the
> module will be called retu_wdt.
>
> +config MOXART_WDT
> + tristate "MOXART watchdog"
> + depends on ARCH_MOXART
> + help
> + Say Y here to include Watchdog timer support for the watchdog
> + existing on the MOXA ART SoC series platforms.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called moxart_wdt.
> +
> # AVR32 Architecture
>
> config AT32AP700X_WDT
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 2f26a0b..7cab53a 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -54,6 +54,7 @@ obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
> obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
> obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
> obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
> +obj-$(CONFIG_MOXART_WDT) += moxart_wdt.o
>
> # AVR32 Architecture
> obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
> diff --git a/drivers/watchdog/moxart_wdt.c b/drivers/watchdog/moxart_wdt.c
> new file mode 100644
> index 0000000..9a59c3d
> --- /dev/null
> +++ b/drivers/watchdog/moxart_wdt.c
> @@ -0,0 +1,166 @@
> +/*
> + * MOXA ART SoCs watchdog driver.
> + *
> + * Copyright (C) 2013 Jonas Jensen
> + *
> + * Jonas Jensen <jonas.jensen@...il.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/watchdog.h>
> +
> +#define REG_COUNT 0x4
> +#define REG_MODE 0x8
> +#define REG_ENABLE 0xC
> +
> +struct moxart_wdt_dev {
> + struct watchdog_device dev;
> + void __iomem *base;
> + unsigned int clock_frequency;
> +};
> +
> +static int heartbeat;
> +
> +static int moxart_wdt_stop(struct watchdog_device *wdt_dev)
> +{
> + struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev);
> +
> + writel(0, moxart_wdt->base + REG_ENABLE);
> +
> + return 0;
> +}
> +
> +static int moxart_wdt_start(struct watchdog_device *wdt_dev)
> +{
> + struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev);
> +
> + writel(moxart_wdt->clock_frequency * moxart_wdt->dev.timeout,
> + moxart_wdt->base + REG_COUNT);
> + writel(0x5ab9, moxart_wdt->base + REG_MODE);
> + writel(0x03, moxart_wdt->base + REG_ENABLE);
> +
> + return 0;
> +}
> +
> +static int moxart_wdt_set_timeout(struct watchdog_device *wdt_dev,
> + unsigned int timeout)
> +{
> + struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev);
> +
> + dev_dbg(wdt_dev->dev, "%s: timeout=%u\n", __func__, timeout);
> +
> + moxart_wdt->dev.timeout = timeout;
> +
> + return 0;
> +}
> +
> +static const struct watchdog_info moxart_wdt_info = {
> + .identity = "moxart-wdt",
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
> + WDIOF_MAGICCLOSE,
> +};
> +
> +static const struct watchdog_ops moxart_wdt_ops = {
> + .owner = THIS_MODULE,
> + .start = moxart_wdt_start,
> + .stop = moxart_wdt_stop,
> + .set_timeout = moxart_wdt_set_timeout,
> +};
> +
> +static int moxart_wdt_probe(struct platform_device *pdev)
> +{
> + struct moxart_wdt_dev *moxart_wdt;
> + struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + struct resource *res;
> + struct clk *clk;
> + int err;
> + unsigned int max_timeout;
> + bool nowayout = WATCHDOG_NOWAYOUT;
> +
> + moxart_wdt = devm_kzalloc(&pdev->dev, sizeof(*moxart_wdt), GFP_KERNEL);
> + if (!moxart_wdt)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, moxart_wdt);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + moxart_wdt->base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(moxart_wdt->base))
> + return PTR_ERR(moxart_wdt->base);
> +
> + clk = of_clk_get(node, 0);
> + if (IS_ERR(clk)) {
> + pr_err("%s: of_clk_get failed\n", __func__);
> + return PTR_ERR(clk);
> + }
> +
> + moxart_wdt->clock_frequency = clk_get_rate(clk);
> + if (moxart_wdt->clock_frequency == 0) {
> + pr_err("%s: incorrect clock frequency\n", __func__);
> + return -EINVAL;
> + }
> +
> + max_timeout = UINT_MAX / moxart_wdt->clock_frequency;
> +
> + moxart_wdt->dev.info = &moxart_wdt_info;
> + moxart_wdt->dev.ops = &moxart_wdt_ops;
> + moxart_wdt->dev.timeout = max_timeout;
> + moxart_wdt->dev.min_timeout = 1;
> + moxart_wdt->dev.max_timeout = max_timeout;
> + moxart_wdt->dev.parent = &pdev->dev;
> +
> + watchdog_init_timeout(&moxart_wdt->dev, heartbeat, &pdev->dev);
> + watchdog_set_nowayout(&moxart_wdt->dev, nowayout);
> +
> + watchdog_set_drvdata(&moxart_wdt->dev, moxart_wdt);
> +
> + err = watchdog_register_device(&moxart_wdt->dev);
> + if (unlikely(err))
> + return err;
> +
> + dev_dbg(dev, "Watchdog enabled (heartbeat=%d sec, nowayout=%d)\n",
> + moxart_wdt->dev.timeout, nowayout);
> +
> + return 0;
> +}
> +
> +static int moxart_wdt_remove(struct platform_device *pdev)
> +{
> + struct moxart_wdt_dev *moxart_wdt = platform_get_drvdata(pdev);
> +
> + moxart_wdt_stop(&moxart_wdt->dev);
> + watchdog_unregister_device(&moxart_wdt->dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id moxart_watchdog_match[] = {
> + { .compatible = "moxa,moxart-watchdog" },
> + { },
> +};
> +
> +static struct platform_driver moxart_wdt_driver = {
> + .probe = moxart_wdt_probe,
> + .remove = moxart_wdt_remove,
> + .driver = {
> + .name = "moxart-watchdog",
> + .owner = THIS_MODULE,
> + .of_match_table = moxart_watchdog_match,
> + },
> +};
> +module_platform_driver(moxart_wdt_driver);
> +
> +module_param(heartbeat, int, 0);
> +MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds");
> +
> +MODULE_DESCRIPTION("MOXART watchdog driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Jonas Jensen <jonas.jensen@...il.com>");
> --
> 1.8.2.1
>
>
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