From fc8cd2ac0ad8fca1ca4699da53e635b3e9cc35ed Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Mon, 10 Feb 2014 20:00:21 -0300 Subject: watchdog: orion: Use atomic access for shared registers Since the timer control register is shared with the clocksource driver, use the recently introduced atomic_io_clear_set() to access such register. Given the watchdog core already provides serialization for all the watchdog ops, this commit allows to remove the spinlock entirely. Reviewed-by: Guenter Roeck Tested-by: Sebastian Hesselbarth Tested-by: Willy Tarreau Signed-off-by: Ezequiel Garcia Acked-by: Wim Van Sebroeck Tested-By: Jason Gunthorpe Signed-off-by: Jason Cooper --- drivers/watchdog/orion_wdt.c | 42 +++++------------------------------------- 1 file changed, 5 insertions(+), 37 deletions(-) (limited to 'drivers/watchdog/orion_wdt.c') diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c index 7f19fa3b543d..b92a9919e068 100644 --- a/drivers/watchdog/orion_wdt.c +++ b/drivers/watchdog/orion_wdt.c @@ -20,7 +20,6 @@ #include #include #include -#include #include #include #include @@ -46,25 +45,16 @@ static unsigned int wdt_max_duration; /* (seconds) */ static struct clk *clk; static unsigned int wdt_tclk; static void __iomem *wdt_reg; -static DEFINE_SPINLOCK(wdt_lock); static int orion_wdt_ping(struct watchdog_device *wdt_dev) { - spin_lock(&wdt_lock); - /* Reload watchdog duration */ writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); - - spin_unlock(&wdt_lock); return 0; } static int orion_wdt_start(struct watchdog_device *wdt_dev) { - u32 reg; - - spin_lock(&wdt_lock); - /* Set watchdog duration */ writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); @@ -72,48 +62,26 @@ static int orion_wdt_start(struct watchdog_device *wdt_dev) writel(~WDT_INT_REQ, BRIDGE_CAUSE); /* Enable watchdog timer */ - reg = readl(wdt_reg + TIMER_CTRL); - reg |= WDT_EN; - writel(reg, wdt_reg + TIMER_CTRL); + atomic_io_modify(wdt_reg + TIMER_CTRL, WDT_EN, WDT_EN); /* Enable reset on watchdog */ - reg = readl(RSTOUTn_MASK); - reg |= WDT_RESET_OUT_EN; - writel(reg, RSTOUTn_MASK); - - spin_unlock(&wdt_lock); + atomic_io_modify(RSTOUTn_MASK, WDT_RESET_OUT_EN, WDT_RESET_OUT_EN); return 0; } static int orion_wdt_stop(struct watchdog_device *wdt_dev) { - u32 reg; - - spin_lock(&wdt_lock); - /* Disable reset on watchdog */ - reg = readl(RSTOUTn_MASK); - reg &= ~WDT_RESET_OUT_EN; - writel(reg, RSTOUTn_MASK); + atomic_io_modify(RSTOUTn_MASK, WDT_RESET_OUT_EN, 0); /* Disable watchdog timer */ - reg = readl(wdt_reg + TIMER_CTRL); - reg &= ~WDT_EN; - writel(reg, wdt_reg + TIMER_CTRL); - - spin_unlock(&wdt_lock); + atomic_io_modify(wdt_reg + TIMER_CTRL, WDT_EN, 0); return 0; } static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev) { - unsigned int time_left; - - spin_lock(&wdt_lock); - time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk; - spin_unlock(&wdt_lock); - - return time_left; + return readl(wdt_reg + WDT_VAL) / wdt_tclk; } static int orion_wdt_set_timeout(struct watchdog_device *wdt_dev, -- cgit v1.2.3