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Date: Fri, 7 Jun 2019 10:40:53 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Anson Huang <anson.huang@....com>
Cc: "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>,
dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH RESEND V4 3/3] watchdog: imx_sc: Add pretimeout support
On Wed, Jun 05, 2019 at 06:24:33AM +0000, Anson Huang wrote:
> 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?
>
I'll pick up patch 3/3, but I can not pick up patches into arch/arm64/boot/;
that is the responsibility of arm64 maintainers. I can only do that
if I get an explicit Ack and permission to do so from an arm64 maintainer,
and I don't recall getting that.
Guenter
> 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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