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authorEzequiel Garcia <ezequiel.garcia@free-electrons.com>2014-02-11 03:00:21 +0400
committerJason Cooper <jason@lakedaemon.net>2014-02-22 07:42:42 +0400
commitfc8cd2ac0ad8fca1ca4699da53e635b3e9cc35ed (patch)
tree8bcfbf309e1addc002e5c8d6435a7ae5b1e03c76 /drivers/watchdog/orion_wdt.c
parentbb02c662d641d51ea8c3ae9c828e89fbcfe04ba7 (diff)
downloadlinux-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.c42
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,