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From: Anson Huang <anson.huang@nxp.com>
To: "robh+dt@kernel.org" <robh+dt@kernel.org>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"wim@linux-watchdog.org" <wim@linux-watchdog.org>,
	"linux@roeck-us.net" <linux@roeck-us.net>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
	"kernel@pengutronix.de" <kernel@pengutronix.de>,
	"festevam@gmail.com" <festevam@gmail.com>,
	Aisheng Dong <aisheng.dong@nxp.com>,
	"ulf.hansson@linaro.org" <ulf.hansson@linaro.org>,
	"sboyd@kernel.org" <sboyd@kernel.org>,
	Daniel Baluta <daniel.baluta@nxp.com>,
	Peng Fan <peng.fan@nxp.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-watchdog@vger.kernel.org" <linux-watchdog@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Cc: dl-linux-imx <linux-imx@nxp.com>
Subject: [PATCH V3 3/3] watchdog: imx_sc: Add pretimeout support
Date: Sun, 5 May 2019 02:15:00 +0000
Message-ID: <1557022189-10993-3-git-send-email-Anson.Huang@nxp.com> (raw)
In-Reply-To: <1557022189-10993-1-git-send-email-Anson.Huang@nxp.com>

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@nxp.com>
---
No change.
---
 drivers/watchdog/Kconfig      |   1 +
 drivers/watchdog/imx_sc_wdt.c | 114 ++++++++++++++++++++++++++++++++++--------
 2 files changed, 95 insertions(+), 20 deletions(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index e19960a..dbc74e1 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -710,6 +710,7 @@ 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..d8493a3 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);
+
+	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 +162,65 @@ 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;
 	}
 
-	return 0;
+	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;
+	}
+
+	imx_sc_wdt_info.options |= WDIOF_PRETIMEOUT;
+	ret = devm_add_action(dev, imx_sc_wdt_action,
+			      &imx_sc_wdd->wdt_notifier);
+	return ret;
 }
 
 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;
 }
-- 
2.7.4


  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-05  2:14 [PATCH V3 1/3] dt-bindings: watchdog: move i.MX system controller watchdog binding to SCU Anson Huang
2019-05-05  2:14 ` [PATCH V3 2/3] arm64: dts: imx8qxp: Move watchdog node into scu node Anson Huang
2019-05-05  2:15 ` Anson Huang [this message]
2019-05-06 18:27   ` [PATCH V3 3/3] watchdog: imx_sc: Add pretimeout support Guenter Roeck
2019-05-07  1:20     ` Anson Huang

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