linux-kernel - [PATCH v4 1/4] Watchdog: sp5100_tco: Move timer initialization into function

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Message-ID: <20220130191225.303115-2-terry.bowman@amd.com>
Date:   Sun, 30 Jan 2022 13:12:22 -0600
From:   Terry Bowman <terry.bowman@....com>
To:     <terry.bowman@....com>, <linux@...ck-us.net>,
        <linux-watchdog@...r.kernel.org>, <jdelvare@...e.com>,
        <linux-i2c@...r.kernel.org>, <wsa@...nel.org>,
        <andy.shevchenko@...il.com>, <rafael.j.wysocki@...el.com>
CC:     <linux-kernel@...r.kernel.org>, <wim@...ux-watchdog.org>,
        <rrichter@....com>, <thomas.lendacky@....com>,
        <sudheesh.mavila@....com>, <Nehal-bakulchandra.Shah@....com>,
        <Basavaraj.Natikar@....com>, <Shyam-sundar.S-k@....com>,
        <Mario.Limonciello@....com>
Subject: [PATCH v4 1/4] Watchdog: sp5100_tco: Move timer initialization into function

Refactor driver's timer initialization into new function. This is needed
inorder to support adding new device layouts while using common timer
initialization.

Co-developed-by: Robert Richter <rrichter@....com>
Signed-off-by: Robert Richter <rrichter@....com>
Signed-off-by: Terry Bowman <terry.bowman@....com>
Tested-by: Jean Delvare <jdelvare@...e.de>
Reviewed-by: Jean Delvare <jdelvare@...e.de>
---
 drivers/watchdog/sp5100_tco.c | 65 +++++++++++++++++++----------------
 1 file changed, 36 insertions(+), 29 deletions(-)

diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index dd9a744f82f8..b365bbc9ac36 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -223,6 +223,41 @@ static u32 sp5100_tco_read_pm_reg32(u8 index)
 	return val;
 }
 
+static int sp5100_tco_timer_init(struct sp5100_tco *tco)
+{
+	struct watchdog_device *wdd = &tco->wdd;
+	struct device *dev = wdd->parent;
+	u32 val;
+
+	val = readl(SP5100_WDT_CONTROL(tco->tcobase));
+	if (val & SP5100_WDT_DISABLED) {
+		dev_err(dev, "Watchdog hardware is disabled\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Save WatchDogFired status, because WatchDogFired flag is
+	 * cleared here.
+	 */
+	if (val & SP5100_WDT_FIRED)
+		wdd->bootstatus = WDIOF_CARDRESET;
+
+	/* Set watchdog action to reset the system */
+	val &= ~SP5100_WDT_ACTION_RESET;
+	writel(val, SP5100_WDT_CONTROL(tco->tcobase));
+
+	/* Set a reasonable heartbeat before we stop the timer */
+	tco_timer_set_timeout(wdd, wdd->timeout);
+
+	/*
+	 * Stop the TCO before we change anything so we don't race with
+	 * a zeroed timer.
+	 */
+	tco_timer_stop(wdd);
+
+	return 0;
+}
+
 static int sp5100_tco_setupdevice(struct device *dev,
 				  struct watchdog_device *wdd)
 {
@@ -348,35 +383,7 @@ static int sp5100_tco_setupdevice(struct device *dev,
 	/* Setup the watchdog timer */
 	tco_timer_enable(tco);
 
-	val = readl(SP5100_WDT_CONTROL(tco->tcobase));
-	if (val & SP5100_WDT_DISABLED) {
-		dev_err(dev, "Watchdog hardware is disabled\n");
-		ret = -ENODEV;
-		goto unreg_region;
-	}
-
-	/*
-	 * Save WatchDogFired status, because WatchDogFired flag is
-	 * cleared here.
-	 */
-	if (val & SP5100_WDT_FIRED)
-		wdd->bootstatus = WDIOF_CARDRESET;
-	/* Set watchdog action to reset the system */
-	val &= ~SP5100_WDT_ACTION_RESET;
-	writel(val, SP5100_WDT_CONTROL(tco->tcobase));
-
-	/* Set a reasonable heartbeat before we stop the timer */
-	tco_timer_set_timeout(wdd, wdd->timeout);
-
-	/*
-	 * Stop the TCO before we change anything so we don't race with
-	 * a zeroed timer.
-	 */
-	tco_timer_stop(wdd);
-
-	release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE);
-
-	return 0;
+	ret = sp5100_tco_timer_init(tco);
 
 unreg_region:
 	release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE);
-- 
2.30.2