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From: Eric Anholt <eric@anholt.net>
To: Florian Fainelli <f.fainelli@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Wim Van Sebroeck <wim@linux-watchdog.org>,
	Guenter Roeck <linux@roeck-us.net>,
	linux-watchdog@vger.kernel.org
Cc: linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Stefan Wahren <stefan.wahren@i2se.com>,
	bcm-kernel-feedback-list@broadcom.com,
	Eric Anholt <eric@anholt.net>
Subject: [PATCH 3/8] soc: bcm: bcm2835-pm: Stop using _relaxed mmio accessors.
Date: Tue, 20 Nov 2018 09:19:55 -0800	[thread overview]
Message-ID: <20181120172000.15102-4-eric@anholt.net> (raw)
In-Reply-To: <20181120172000.15102-1-eric@anholt.net>

We definitely don't want I/O to be reordered here (like the setting of
the WDT timeout before enabling the WDT).  None of this is performance
critical, anyway.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/soc/bcm/bcm2835-pm.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/soc/bcm/bcm2835-pm.c b/drivers/soc/bcm/bcm2835-pm.c
index ca37145e4e40..decc316fbe40 100644
--- a/drivers/soc/bcm/bcm2835-pm.c
+++ b/drivers/soc/bcm/bcm2835-pm.c
@@ -67,11 +67,11 @@ static int bcm2835_wdt_start(struct watchdog_device *wdog)
 
 	spin_lock_irqsave(&pm->lock, flags);
 
-	writel_relaxed(PM_PASSWORD | (SECS_TO_WDOG_TICKS(wdog->timeout) &
-				PM_WDOG_TIME_SET), pm->base + PM_WDOG);
-	cur = readl_relaxed(pm->base + PM_RSTC);
-	writel_relaxed(PM_PASSWORD | (cur & PM_RSTC_WRCFG_CLR) |
-		  PM_RSTC_WRCFG_FULL_RESET, pm->base + PM_RSTC);
+	writel(PM_PASSWORD | (SECS_TO_WDOG_TICKS(wdog->timeout) &
+			      PM_WDOG_TIME_SET), pm->base + PM_WDOG);
+	cur = readl(pm->base + PM_RSTC);
+	writel(PM_PASSWORD | (cur & PM_RSTC_WRCFG_CLR) |
+	       PM_RSTC_WRCFG_FULL_RESET, pm->base + PM_RSTC);
 
 	spin_unlock_irqrestore(&pm->lock, flags);
 
@@ -82,7 +82,7 @@ static int bcm2835_wdt_stop(struct watchdog_device *wdog)
 {
 	struct bcm2835_pm *pm = watchdog_get_drvdata(wdog);
 
-	writel_relaxed(PM_PASSWORD | PM_RSTC_RESET, pm->base + PM_RSTC);
+	writel(PM_PASSWORD | PM_RSTC_RESET, pm->base + PM_RSTC);
 	return 0;
 }
 
@@ -90,7 +90,7 @@ static unsigned int bcm2835_wdt_get_timeleft(struct watchdog_device *wdog)
 {
 	struct bcm2835_pm *pm = watchdog_get_drvdata(wdog);
 
-	uint32_t ret = readl_relaxed(pm->base + PM_WDOG);
+	uint32_t ret = readl(pm->base + PM_WDOG);
 	return WDOG_TICKS_TO_SECS(ret & PM_WDOG_TIME_SET);
 }
 
@@ -99,11 +99,11 @@ static void __bcm2835_restart(struct bcm2835_pm *pm)
 	u32 val;
 
 	/* use a timeout of 10 ticks (~150us) */
-	writel_relaxed(10 | PM_PASSWORD, pm->base + PM_WDOG);
-	val = readl_relaxed(pm->base + PM_RSTC);
+	writel(10 | PM_PASSWORD, pm->base + PM_WDOG);
+	val = readl(pm->base + PM_RSTC);
 	val &= PM_RSTC_WRCFG_CLR;
 	val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET;
-	writel_relaxed(val, pm->base + PM_RSTC);
+	writel(val, pm->base + PM_RSTC);
 
 	/* No sleeping, possibly atomic. */
 	mdelay(1);
@@ -159,9 +159,9 @@ static void bcm2835_power_off(void)
 	 * from the normal (full) reset. bootcode.bin will not reboot after a
 	 * hard reset.
 	 */
-	val = readl_relaxed(pm->base + PM_RSTS);
+	val = readl(pm->base + PM_RSTS);
 	val |= PM_PASSWORD | PM_RSTS_RASPBERRYPI_HALT;
-	writel_relaxed(val, pm->base + PM_RSTS);
+	writel(val, pm->base + PM_RSTS);
 
 	/* Continue with normal reset mechanism */
 	__bcm2835_restart(pm);
-- 
2.19.1


  parent reply	other threads:[~2018-11-20 17:20 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-20 17:19 [PATCH 0/8] BCM2835 PM driver Eric Anholt
2018-11-20 17:19 ` [PATCH 1/8] watchdog: bcm2835: Move the driver to the soc/ directory Eric Anholt
2018-11-20 17:29   ` Guenter Roeck
2018-11-20 17:19 ` [PATCH 2/8] soc: bcm: bcm2835-pm: Rename the driver to its new "PM" name Eric Anholt
2018-11-20 17:19 ` Eric Anholt [this message]
2018-11-20 17:19 ` [PATCH 4/8] soc: bcm: bcm2835-pm: Make some little accessor macros for the mmio area Eric Anholt
2018-11-20 17:19 ` [PATCH 5/8] dt-bindings: soc: Add a new binding for the BCM2835 PM node Eric Anholt
2018-11-20 17:19 ` [PATCH 6/8] soc: bcm: bcm2835-pm: Add support for power domains under a new binding Eric Anholt
2018-11-20 17:19 ` [PATCH 7/8] ARM: bcm283x: Extend the WDT DT node out to cover the whole PM block Eric Anholt
2018-11-20 17:20 ` [PATCH 8/8] ARM: bcm283x: Switch V3D over to using the PM driver instead of firmware Eric Anholt
2018-11-20 17:49 ` [PATCH 0/8] BCM2835 PM driver Stefan Wahren
2018-11-20 21:34   ` Eric Anholt
2018-11-20 21:39     ` Arnd Bergmann

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