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watchdog: sp805: replace readl/writel with lighter _relaxed variants 

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 <viresh.kumar@st.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
hifive-unleashed-5.1
Viresh Kumar 2012-03-12 09:52:14 +05:30 committed by Wim Van Sebroeck
parent bfae14b679
commit d2e8919bcf
1 changed files with 12 additions and 12 deletions
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24
drivers/watchdog/sp805_wdt.c
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@ -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);
}