[PATCH V2 19/22] watchdog/sp805: replace readl/writel with lighter _relaxed variants
From: Viresh Kumar <hidden>
Date: 2012-03-12 04:22:14
Also in:
linux-watchdog
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
readl/writel versions for ARM contain memory barrier instruction for synchronizing DMA buffers. These are not required at least on this module. So use lighter _relaxed variants. Signed-off-by: Viresh Kumar <redacted> --- drivers/watchdog/sp805_wdt.c | 24 ++++++++++++------------ 1 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 7af1386..1291960 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c@@ -113,10 +113,10 @@ static u32 wdt_timeleft(void) rate = clk_get_rate(wdt->clk); spin_lock(&wdt->lock); - load = readl(wdt->base + WDTVALUE); + load = readl_relaxed(wdt->base + WDTVALUE); /*If the interrupt is inactive then time left is WDTValue + WDTLoad. */ - if (!(readl(wdt->base + WDTRIS) & INT_MASK)) + if (!(readl_relaxed(wdt->base + WDTRIS) & INT_MASK)) load += wdt->load_val + 1; spin_unlock(&wdt->lock);
@@ -128,14 +128,14 @@ static void wdt_enable(void) { spin_lock(&wdt->lock); - writel(UNLOCK, wdt->base + WDTLOCK); - writel(wdt->load_val, wdt->base + WDTLOAD); - writel(INT_MASK, wdt->base + WDTINTCLR); - writel(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL); - writel(LOCK, wdt->base + WDTLOCK); + writel_relaxed(UNLOCK, wdt->base + WDTLOCK); + writel_relaxed(wdt->load_val, wdt->base + WDTLOAD); + writel_relaxed(INT_MASK, wdt->base + WDTINTCLR); + writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL); + writel_relaxed(LOCK, wdt->base + WDTLOCK); /* Flush posted writes. */ - readl(wdt->base + WDTLOCK); + readl_relaxed(wdt->base + WDTLOCK); spin_unlock(&wdt->lock); }
@@ -144,12 +144,12 @@ static void wdt_disable(void) { spin_lock(&wdt->lock); - writel(UNLOCK, wdt->base + WDTLOCK); - writel(0, wdt->base + WDTCONTROL); - writel(LOCK, wdt->base + WDTLOCK); + writel_relaxed(UNLOCK, wdt->base + WDTLOCK); + writel_relaxed(0, wdt->base + WDTCONTROL); + writel_relaxed(LOCK, wdt->base + WDTLOCK); /* Flush posted writes. */ - readl(wdt->base + WDTLOCK); + readl_relaxed(wdt->base + WDTLOCK); spin_unlock(&wdt->lock); }
--
1.7.8.110.g4cb5d