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Date: Tue, 20 Aug 2019 08:48:15 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Anson.Huang@....com
Cc: wim@...ux-watchdog.org, robh+dt@...nel.org, mark.rutland@....com,
shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
festevam@...il.com, linux@...linux.org.uk, otavio@...ystems.com.br,
leonard.crestez@....com, u.kleine-koenig@...gutronix.de,
schnitzeltony@...il.com, jan.tuerk@...rion.com,
linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Linux-imx@....com
Subject: Re: [PATCH V2 2/4] watchdog: Add i.MX7ULP watchdog support
On Tue, Aug 20, 2019 at 08:31:55AM -0700, Guenter Roeck wrote:
> On Mon, Aug 12, 2019 at 04:53:19PM +0800, Anson.Huang@....com wrote:
> > From: Anson Huang <Anson.Huang@....com>
> >
> > The i.MX7ULP Watchdog Timer (WDOG) module is an independent timer
> > that is available for system use.
> > It provides a safety feature to ensure that software is executing
> > as planned and that the CPU is not stuck in an infinite loop or
> > executing unintended code. If the WDOG module is not serviced
> > (refreshed) within a certain period, it resets the MCU.
> >
> > Add driver support for i.MX7ULP watchdog.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
>
Wait, I have to withdraw that.
With clk_prepare_enable(), you'll also need to call clk_disable_unprepare()
on remove. An easy way to do this and keep the code simple would be:
static void imx7ulp_wdt_clk_disable_unprepare(void *data)
{
clk_disable_unprepare(data);
}
static int imx7ulp_wdt_probe(...)
{
...
ret = clk_prepare_enable(imx7ulp_wdt->clk);
if (ret)
return ret;
ret = devm_add_action_or_reset(dev, imx7ulp_wdt_clk_disable_unprepare);
if (ret)
return ret;
...
Thanks,
Guenter
> > ---
> > Changes since V1:
> > - Add clock operation;
> > - Remove unneccsary error message when registering watchdog device failed;
> > - Use BIT() instead of hard code;
> > ---
> > drivers/watchdog/Kconfig | 13 +++
> > drivers/watchdog/Makefile | 1 +
> > drivers/watchdog/imx7ulp_wdt.c | 244 +++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 258 insertions(+)
> > create mode 100644 drivers/watchdog/imx7ulp_wdt.c
> >
> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> > index 8188963..0884e53 100644
> > --- a/drivers/watchdog/Kconfig
> > +++ b/drivers/watchdog/Kconfig
> > @@ -740,6 +740,19 @@ config IMX_SC_WDT
> > To compile this driver as a module, choose M here: the
> > module will be called imx_sc_wdt.
> >
> > +config IMX7ULP_WDT
> > + tristate "IMX7ULP Watchdog"
> > + depends on ARCH_MXC || COMPILE_TEST
> > + select WATCHDOG_CORE
> > + help
> > + This is the driver for the hardware watchdog on the Freescale
> > + IMX7ULP and later processors. If you have one of these
> > + processors and wish to have watchdog support enabled,
> > + say Y, otherwise say N.
> > +
> > + To compile this driver as a module, choose M here: the
> > + module will be called imx7ulp_wdt.
> > +
> > config UX500_WATCHDOG
> > tristate "ST-Ericsson Ux500 watchdog"
> > depends on MFD_DB8500_PRCMU
> > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> > index 7caa920..7d32537 100644
> > --- a/drivers/watchdog/Makefile
> > +++ b/drivers/watchdog/Makefile
> > @@ -69,6 +69,7 @@ obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o
> > obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
> > obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
> > obj-$(CONFIG_IMX_SC_WDT) += imx_sc_wdt.o
> > +obj-$(CONFIG_IMX7ULP_WDT) += imx7ulp_wdt.o
> > obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
> > obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
> > obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
> > diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
> > new file mode 100644
> > index 0000000..c20fba4
> > --- /dev/null
> > +++ b/drivers/watchdog/imx7ulp_wdt.c
> > @@ -0,0 +1,244 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright 2019 NXP.
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/init.h>
> > +#include <linux/io.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/reboot.h>
> > +#include <linux/watchdog.h>
> > +
> > +#define WDOG_CS 0x0
> > +#define WDOG_CS_CMD32EN BIT(13)
> > +#define WDOG_CS_ULK BIT(11)
> > +#define WDOG_CS_RCS BIT(10)
> > +#define WDOG_CS_EN BIT(7)
> > +#define WDOG_CS_UPDATE BIT(5)
> > +
> > +#define WDOG_CNT 0x4
> > +#define WDOG_TOVAL 0x8
> > +
> > +#define REFRESH_SEQ0 0xA602
> > +#define REFRESH_SEQ1 0xB480
> > +#define REFRESH ((REFRESH_SEQ1 << 16) | REFRESH_SEQ0)
> > +
> > +#define UNLOCK_SEQ0 0xC520
> > +#define UNLOCK_SEQ1 0xD928
> > +#define UNLOCK ((UNLOCK_SEQ1 << 16) | UNLOCK_SEQ0)
> > +
> > +#define DEFAULT_TIMEOUT 60
> > +#define MAX_TIMEOUT 128
> > +
> > +static bool nowayout = WATCHDOG_NOWAYOUT;
> > +module_param(nowayout, bool, 0000);
> > +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
> > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> > +
> > +struct imx7ulp_wdt_device {
> > + struct notifier_block restart_handler;
> > + struct watchdog_device wdd;
> > + void __iomem *base;
> > + struct clk *clk;
> > + int rate;
> > +};
> > +
> > +static inline void imx7ulp_wdt_enable(void __iomem *base, bool enable)
> > +{
> > + u32 val = readl(base + WDOG_CS);
> > +
> > + writel(UNLOCK, base + WDOG_CNT);
> > + if (enable)
> > + writel(val | WDOG_CS_EN, base + WDOG_CS);
> > + else
> > + writel(val & ~WDOG_CS_EN, base + WDOG_CS);
> > +}
> > +
> > +static inline bool imx7ulp_wdt_is_enabled(void __iomem *base)
> > +{
> > + u32 val = readl(base + WDOG_CS);
> > +
> > + return val & WDOG_CS_EN;
> > +}
> > +
> > +static int imx7ulp_wdt_ping(struct watchdog_device *wdog)
> > +{
> > + struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
> > +
> > + writel(REFRESH, wdt->base + WDOG_CNT);
> > +
> > + return 0;
> > +}
> > +
> > +static int imx7ulp_wdt_start(struct watchdog_device *wdog)
> > +{
> > + struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
> > +
> > + imx7ulp_wdt_enable(wdt->base, true);
> > +
> > + return 0;
> > +}
> > +
> > +static int imx7ulp_wdt_stop(struct watchdog_device *wdog)
> > +{
> > + struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
> > +
> > + imx7ulp_wdt_enable(wdt->base, false);
> > +
> > + return 0;
> > +}
> > +
> > +static int imx7ulp_wdt_set_timeout(struct watchdog_device *wdog,
> > + unsigned int timeout)
> > +{
> > + struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
> > + u32 val = wdt->rate * timeout;
> > +
> > + writel(UNLOCK, wdt->base + WDOG_CNT);
> > + writel(val, wdt->base + WDOG_TOVAL);
> > +
> > + wdog->timeout = timeout;
> > +
> > + return 0;
> > +}
> > +
> > +static const struct watchdog_ops imx7ulp_wdt_ops = {
> > + .owner = THIS_MODULE,
> > + .start = imx7ulp_wdt_start,
> > + .stop = imx7ulp_wdt_stop,
> > + .ping = imx7ulp_wdt_ping,
> > + .set_timeout = imx7ulp_wdt_set_timeout,
> > +};
> > +
> > +static const struct watchdog_info imx7ulp_wdt_info = {
> > + .identity = "i.MX7ULP watchdog timer",
> > + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
> > + WDIOF_MAGICCLOSE,
> > +};
> > +
> > +static inline void imx7ulp_wdt_init(void __iomem *base, unsigned int timeout)
> > +{
> > + u32 val;
> > +
> > + /* unlock the wdog for reconfiguration */
> > + writel_relaxed(UNLOCK_SEQ0, base + WDOG_CNT);
> > + writel_relaxed(UNLOCK_SEQ1, base + WDOG_CNT);
> > +
> > + /* set an initial timeout value in TOVAL */
> > + writel(timeout, base + WDOG_TOVAL);
> > + /* enable 32bit command sequence and reconfigure */
> > + val = BIT(13) | BIT(8) | BIT(5);
> > + writel(val, base + WDOG_CS);
> > +}
> > +
> > +static int imx7ulp_wdt_probe(struct platform_device *pdev)
> > +{
> > + struct imx7ulp_wdt_device *imx7ulp_wdt;
> > + struct device *dev = &pdev->dev;
> > + struct watchdog_device *wdog;
> > + int ret;
> > +
> > + imx7ulp_wdt = devm_kzalloc(dev, sizeof(*imx7ulp_wdt), GFP_KERNEL);
> > + if (!imx7ulp_wdt)
> > + return -ENOMEM;
> > +
> > + platform_set_drvdata(pdev, imx7ulp_wdt);
> > +
> > + imx7ulp_wdt->base = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(imx7ulp_wdt->base))
> > + return PTR_ERR(imx7ulp_wdt->base);
> > +
> > + imx7ulp_wdt->clk = devm_clk_get(dev, NULL);
> > + if (IS_ERR(imx7ulp_wdt->clk)) {
> > + dev_err(dev, "Failed to get watchdog clock\n");
> > + return PTR_ERR(imx7ulp_wdt->clk);
> > + }
> > +
> > + ret = clk_prepare_enable(imx7ulp_wdt->clk);
> > + if (ret)
> > + return ret;
> > +
> > + imx7ulp_wdt->rate = 1000;
> > + wdog = &imx7ulp_wdt->wdd;
> > + wdog->info = &imx7ulp_wdt_info;
> > + wdog->ops = &imx7ulp_wdt_ops;
> > + wdog->min_timeout = 1;
> > + wdog->max_timeout = MAX_TIMEOUT;
> > + wdog->parent = dev;
> > + wdog->timeout = DEFAULT_TIMEOUT;
> > +
> > + watchdog_init_timeout(wdog, 0, dev);
> > + watchdog_stop_on_reboot(wdog);
> > + watchdog_stop_on_unregister(wdog);
> > + watchdog_set_drvdata(wdog, imx7ulp_wdt);
> > + imx7ulp_wdt_init(imx7ulp_wdt->base, wdog->timeout * imx7ulp_wdt->rate);
> > +
> > + ret = devm_watchdog_register_device(dev, wdog);
> > + if (ret)
> > + goto disable_clk;
> > +
> > + return 0;
> > +
> > +disable_clk:
> > + clk_disable_unprepare(imx7ulp_wdt->clk);
> > +
> > + return ret;
> > +}
> > +
> > +static int __maybe_unused imx7ulp_wdt_suspend(struct device *dev)
> > +{
> > + struct imx7ulp_wdt_device *imx7ulp_wdt = dev_get_drvdata(dev);
> > +
> > + if (watchdog_active(&imx7ulp_wdt->wdd))
> > + imx7ulp_wdt_stop(&imx7ulp_wdt->wdd);
> > +
> > + clk_disable_unprepare(imx7ulp_wdt->clk);
> > +
> > + return 0;
> > +}
> > +
> > +static int __maybe_unused imx7ulp_wdt_resume(struct device *dev)
> > +{
> > + struct imx7ulp_wdt_device *imx7ulp_wdt = dev_get_drvdata(dev);
> > + u32 timeout = imx7ulp_wdt->wdd.timeout * imx7ulp_wdt->rate;
> > + int ret;
> > +
> > + ret = clk_prepare_enable(imx7ulp_wdt->clk);
> > + if (ret)
> > + return ret;
> > +
> > + if (imx7ulp_wdt_is_enabled(imx7ulp_wdt->base))
> > + imx7ulp_wdt_init(imx7ulp_wdt->base, timeout);
> > +
> > + if (watchdog_active(&imx7ulp_wdt->wdd))
> > + imx7ulp_wdt_start(&imx7ulp_wdt->wdd);
> > +
> > + return 0;
> > +}
> > +
> > +static SIMPLE_DEV_PM_OPS(imx7ulp_wdt_pm_ops, imx7ulp_wdt_suspend,
> > + imx7ulp_wdt_resume);
> > +
> > +static const struct of_device_id imx7ulp_wdt_dt_ids[] = {
> > + { .compatible = "fsl,imx7ulp-wdt", },
> > + { /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, imx7ulp_wdt_dt_ids);
> > +
> > +static struct platform_driver imx7ulp_wdt_driver = {
> > + .probe = imx7ulp_wdt_probe,
> > + .driver = {
> > + .name = "imx7ulp-wdt",
> > + .pm = &imx7ulp_wdt_pm_ops,
> > + .of_match_table = imx7ulp_wdt_dt_ids,
> > + },
> > +};
> > +module_platform_driver(imx7ulp_wdt_driver);
> > +
> > +MODULE_AUTHOR("Anson Huang <Anson.Huang@....com>");
> > +MODULE_DESCRIPTION("Freescale i.MX7ULP watchdog driver");
> > +MODULE_LICENSE("GPL v2");
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