diff options
| author | Ezequiel Garcia <ezequiel.garcia@free-electrons.com> | 2014-02-11 03:00:21 +0400 |
|---|---|---|
| committer | Jason Cooper <jason@lakedaemon.net> | 2014-02-22 07:42:42 +0400 |
| commit | fc8cd2ac0ad8fca1ca4699da53e635b3e9cc35ed (patch) | |
| tree | 8bcfbf309e1addc002e5c8d6435a7ae5b1e03c76 /drivers/watchdog/orion_wdt.c | |
| parent | bb02c662d641d51ea8c3ae9c828e89fbcfe04ba7 (diff) | |
| download | linux-fc8cd2ac0ad8fca1ca4699da53e635b3e9cc35ed.tar.xz | |
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 <linux@roeck-us.net>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Acked-by: Wim Van Sebroeck <wim@iguana.be>
Tested-By: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/watchdog/orion_wdt.c')
| -rw-r--r-- | drivers/watchdog/orion_wdt.c | 42 |
1 files changed, 5 insertions, 37 deletions
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 <linux/watchdog.h> #include <linux/init.h> #include <linux/io.h> -#include <linux/spinlock.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/of.h> @@ -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, |