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authorViresh Kumar <viresh.kumar@st.com>2012-03-12 08:22:14 +0400
committerWim Van Sebroeck <wim@iguana.be>2012-03-27 22:14:31 +0400
commitd2e8919bcfb63b662945d0e5cb9338f0f2229d10 (patch)
treef1b4e176b7c0b73c0b146ea24745ffed0506e16a /drivers/watchdog/sp805_wdt.c
parentbfae14b679063d85f10579bbfd532db58b122e29 (diff)
downloadlinux-d2e8919bcfb63b662945d0e5cb9338f0f2229d10.tar.xz
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>
Diffstat (limited to 'drivers/watchdog/sp805_wdt.c')
-rw-r--r--drivers/watchdog/sp805_wdt.c24
1 files changed, 12 insertions, 12 deletions
diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 3e4edda261d1..6e751573a2d1 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);
}