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Date:   Wed, 5 Jun 2019 06:24:33 +0000
From:   Anson Huang <anson.huang@....com>
To:     Guenter Roeck <linux@...ck-us.net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Aisheng Dong <aisheng.dong@....com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        Daniel Baluta <daniel.baluta@....com>,
        Peng Fan <peng.fan@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH RESEND V4 3/3] watchdog: imx_sc: Add pretimeout support

Hi, Guenter

> -----Original Message-----
> From: Guenter Roeck <groeck7@...il.com> On Behalf Of Guenter Roeck
> Sent: Sunday, May 12, 2019 9:28 PM
> To: Anson Huang <anson.huang@....com>; robh+dt@...nel.org;
> mark.rutland@....com; wim@...ux-watchdog.org; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> Aisheng Dong <aisheng.dong@....com>; ulf.hansson@...aro.org; Daniel
> Baluta <daniel.baluta@....com>; Peng Fan <peng.fan@....com>;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> watchdog@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH RESEND V4 3/3] watchdog: imx_sc: Add pretimeout
> support
> 
> On 5/12/19 3:10 AM, Anson Huang wrote:
> > i.MX system controller watchdog can support pretimeout IRQ via general
> > SCU MU IRQ, it depends on IMX_SCU and driver MUST be probed after SCU
> > IPC ready, then enable corresponding SCU IRQ group and register SCU
> > IRQ notifier, when watchdog pretimeout IRQ fires, SCU MU IRQ will be
> > handled and watchdog pretimeout notifier will be called to handle the
> > event.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> 
> Revviewed-by: Guenter Roeck <linux@...ck-us.net>
> 
> Other patches waiting for DT review. IMX API feedback below.

Shaw just picked up the DT patch. Would you please pick up this driver and dt-binding patch
to you git repo?

Thanks,
Anson

> 
> Side note: This patch depends on 'firmware: imx: enable imx scu general irq
> function' which is not yet in mainline.
> 
> > ---
> > No change, just resend patch with correct encoding.
> > ---
> >   drivers/watchdog/Kconfig      |   1 +
> >   drivers/watchdog/imx_sc_wdt.c | 116
> +++++++++++++++++++++++++++++++++++-------
> >   2 files changed, 98 insertions(+), 19 deletions(-)
> >
> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index
> > 7ea6037..e08238c 100644
> > --- a/drivers/watchdog/Kconfig
> > +++ b/drivers/watchdog/Kconfig
> > @@ -716,6 +716,7 @@ config IMX2_WDT
> >   config IMX_SC_WDT
> >   	tristate "IMX SC Watchdog"
> >   	depends on HAVE_ARM_SMCCC
> > +	depends on IMX_SCU
> >   	select WATCHDOG_CORE
> >   	help
> >   	  This is the driver for the system controller watchdog diff --git
> > a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c index
> > 49848b6..6ecc03f 100644
> > --- a/drivers/watchdog/imx_sc_wdt.c
> > +++ b/drivers/watchdog/imx_sc_wdt.c
> > @@ -4,6 +4,7 @@
> >    */
> >
> >   #include <linux/arm-smccc.h>
> > +#include <linux/firmware/imx/sci.h>
> >   #include <linux/io.h>
> >   #include <linux/init.h>
> >   #include <linux/kernel.h>
> > @@ -33,11 +34,19 @@
> >
> >   #define SC_TIMER_WDOG_ACTION_PARTITION	0
> >
> > +#define SC_IRQ_WDOG			1
> > +#define SC_IRQ_GROUP_WDOG		1
> > +
> >   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 imx_sc_wdt_device {
> > +	struct watchdog_device wdd;
> > +	struct notifier_block wdt_notifier;
> > +};
> > +
> >   static int imx_sc_wdt_ping(struct watchdog_device *wdog)
> >   {
> >   	struct arm_smccc_res res;
> > @@ -85,24 +94,66 @@ static int imx_sc_wdt_set_timeout(struct
> watchdog_device *wdog,
> >   	return res.a0 ? -EACCES : 0;
> >   }
> >
> > +static int imx_sc_wdt_set_pretimeout(struct watchdog_device *wdog,
> > +				     unsigned int pretimeout)
> > +{
> > +	struct arm_smccc_res res;
> > +
> > +	arm_smccc_smc(IMX_SIP_TIMER,
> IMX_SIP_TIMER_SET_PRETIME_WDOG,
> > +		      pretimeout * 1000, 0, 0, 0, 0, 0, &res);
> > +	if (res.a0)
> > +		return -EACCES;
> > +
> > +	wdog->pretimeout = pretimeout;
> > +
> > +	return 0;
> > +}
> > +
> > +static int imx_sc_wdt_notify(struct notifier_block *nb,
> > +			     unsigned long event, void *group) {
> > +	struct imx_sc_wdt_device *imx_sc_wdd =
> > +				 container_of(nb,
> > +					      struct imx_sc_wdt_device,
> > +					      wdt_notifier);
> > +
> > +	if (event & SC_IRQ_WDOG &&
> > +	    *(u8 *)group == SC_IRQ_GROUP_WDOG)
> > +		watchdog_notify_pretimeout(&imx_sc_wdd->wdd);
> 
> This should really not be necessary. Event mask and target group (if needed
> with a wildcard for the group) should be parameters of
> imx_scu_irq_register_notifier(), and be handled in the imx code.
> 
> Also, passing 'group' as pointed seems excessive. Might as well pass it
> directly.
> 
> Guenter
> 
> > +
> > +	return 0;
> > +}
> > +
> > +static void imx_sc_wdt_action(void *data) {
> > +	struct notifier_block *wdt_notifier = data;
> > +
> > +	imx_scu_irq_unregister_notifier(wdt_notifier);
> > +	imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
> > +				 SC_IRQ_WDOG,
> > +				 false);
> > +}
> > +
> >   static const struct watchdog_ops imx_sc_wdt_ops = {
> >   	.owner = THIS_MODULE,
> >   	.start = imx_sc_wdt_start,
> >   	.stop  = imx_sc_wdt_stop,
> >   	.ping  = imx_sc_wdt_ping,
> >   	.set_timeout = imx_sc_wdt_set_timeout,
> > +	.set_pretimeout = imx_sc_wdt_set_pretimeout,
> >   };
> >
> > -static const struct watchdog_info imx_sc_wdt_info = {
> > +static struct watchdog_info imx_sc_wdt_info = {
> >   	.identity	= "i.MX SC watchdog timer",
> >   	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
> > -			  WDIOF_MAGICCLOSE | WDIOF_PRETIMEOUT,
> > +			  WDIOF_MAGICCLOSE,
> >   };
> >
> >   static int imx_sc_wdt_probe(struct platform_device *pdev)
> >   {
> > +	struct imx_sc_wdt_device *imx_sc_wdd;
> > +	struct watchdog_device *wdog;
> >   	struct device *dev = &pdev->dev;
> > -	struct watchdog_device *imx_sc_wdd;
> >   	int ret;
> >
> >   	imx_sc_wdd = devm_kzalloc(dev, sizeof(*imx_sc_wdd), GFP_KERNEL);
> @@
> > -111,42 +162,69 @@ static int imx_sc_wdt_probe(struct platform_device
> > *pdev)
> >
> >   	platform_set_drvdata(pdev, imx_sc_wdd);
> >
> > -	imx_sc_wdd->info = &imx_sc_wdt_info;
> > -	imx_sc_wdd->ops = &imx_sc_wdt_ops;
> > -	imx_sc_wdd->min_timeout = 1;
> > -	imx_sc_wdd->max_timeout = MAX_TIMEOUT;
> > -	imx_sc_wdd->parent = dev;
> > -	imx_sc_wdd->timeout = DEFAULT_TIMEOUT;
> > +	wdog = &imx_sc_wdd->wdd;
> > +	wdog->info = &imx_sc_wdt_info;
> > +	wdog->ops = &imx_sc_wdt_ops;
> > +	wdog->min_timeout = 1;
> > +	wdog->max_timeout = MAX_TIMEOUT;
> > +	wdog->parent = dev;
> > +	wdog->timeout = DEFAULT_TIMEOUT;
> >
> > -	watchdog_init_timeout(imx_sc_wdd, 0, dev);
> > -	watchdog_stop_on_reboot(imx_sc_wdd);
> > -	watchdog_stop_on_unregister(imx_sc_wdd);
> > +	watchdog_init_timeout(wdog, 0, dev);
> > +	watchdog_stop_on_reboot(wdog);
> > +	watchdog_stop_on_unregister(wdog);
> >
> > -	ret = devm_watchdog_register_device(dev, imx_sc_wdd);
> > +	ret = devm_watchdog_register_device(dev, wdog);
> >   	if (ret) {
> >   		dev_err(dev, "Failed to register watchdog device\n");
> >   		return ret;
> >   	}
> >
> > +	ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
> > +				       SC_IRQ_WDOG,
> > +				       true);
> > +	if (ret) {
> > +		dev_warn(dev, "Enable irq failed, pretimeout NOT
> supported\n");
> > +		return 0;
> > +	}
> > +
> > +	imx_sc_wdd->wdt_notifier.notifier_call = imx_sc_wdt_notify;
> > +	ret = imx_scu_irq_register_notifier(&imx_sc_wdd->wdt_notifier);
> > +	if (ret) {
> > +		imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
> > +					 SC_IRQ_WDOG,
> > +					 false);
> > +		dev_warn(dev,
> > +			 "Register irq notifier failed, pretimeout NOT
> supported\n");
> > +		return 0;
> > +	}
> > +
> > +	ret = devm_add_action_or_reset(dev, imx_sc_wdt_action,
> > +				       &imx_sc_wdd->wdt_notifier);
> > +	if (!ret)
> > +		imx_sc_wdt_info.options |= WDIOF_PRETIMEOUT;
> > +	else
> > +		dev_warn(dev, "Add action failed, pretimeout NOT
> supported\n");
> > +
> >   	return 0;
> >   }
> >
> >   static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
> >   {
> > -	struct watchdog_device *imx_sc_wdd = dev_get_drvdata(dev);
> > +	struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
> >
> > -	if (watchdog_active(imx_sc_wdd))
> > -		imx_sc_wdt_stop(imx_sc_wdd);
> > +	if (watchdog_active(&imx_sc_wdd->wdd))
> > +		imx_sc_wdt_stop(&imx_sc_wdd->wdd);
> >
> >   	return 0;
> >   }
> >
> >   static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
> >   {
> > -	struct watchdog_device *imx_sc_wdd = dev_get_drvdata(dev);
> > +	struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
> >
> > -	if (watchdog_active(imx_sc_wdd))
> > -		imx_sc_wdt_start(imx_sc_wdd);
> > +	if (watchdog_active(&imx_sc_wdd->wdd))
> > +		imx_sc_wdt_start(&imx_sc_wdd->wdd);
> >
> >   	return 0;
> >   }
> >

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