@@ -241,6 +241,19 @@ static void __cpuinit twd_setup(void *data)
0xf, 0xffffffff);
}
+/* Needed by mpcore_wdt */
+unsigned long twd_timer_get_rate(void)
+{
+ unsigned long rate;
+
+ if (!IS_ERR_OR_NULL(twd_clk))
+ rate = clk_get_rate(twd_clk);
+ else
+ rate = twd_timer_rate;
+ return rate;
+}
+EXPORT_SYMBOL(twd_timer_get_rate);
+
static void __cpuinit twd_teardown(void *data)
{
struct clock_event_device *clk = data;
@@ -33,6 +33,8 @@
#include <linux/slab.h>
#include <linux/io.h>
+unsigned long twd_timer_get_rate(void);
+
#define TWD_WDOG_LOAD 0x20
#define TWD_WDOG_COUNTER 0x24
#define TWD_WDOG_CONTROL 0x28
@@ -104,9 +106,7 @@ static void mpcore_wdt_keepalive(struct mpcore_wdt *wdt)
spin_lock(&wdt_lock);
/* Assume prescale is set to 256 */
- count = __raw_readl(wdt->base + TWD_WDOG_COUNTER);
- count = (0xFFFFFFFFU - count) * (HZ / 5);
- count = (count / 256) * mpcore_margin;
+ count = (twd_timer_get_rate() / 256) * mpcore_margin;
/* Reload the counter */
writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD);
Although the commit "98af057092f8f0dabe63c5df08adc2bbfbddb1d2 ARM: 6126/1: ARM mpcore_wdt: fix build failure and other fixes" resolved long standing mpcore_wdt driver build problems, it introduced an error in the relationship between the MPcore watchdog timer clock rate and mpcore_margin, "MPcore timer margin in seconds", such that watchdog timeouts are now arbitrary rather than the number of seconds specified by mpcore_margin. This change restores mpcore_wdt_keepalive() to its equivalent implementation prior to commit 98af057 such that watchdog timeouts now occur as specified by mpcore_margin. The variable 'mpcore_timer_rate' which caused that build failure was replaced by 'twd_timer_rate'. Adding exported function to obtain 'twd_timer_rate' value in mpcore_wdt driver. A build error will not occur because MPCORE_WATCHDOG needed to build 'mpcore_wdt' depends on HAVE_ARM_TWD needed to build 'smp_twd'. Signed-off-by: Vitaly Kuzmichev <vkuzmichev@mvista.com> --- drivers/clocksource/arm_smp_twd.c | 13 +++++++++++++ drivers/watchdog/mpcore_wdt.c | 6 +++--- 2 files changed, 16 insertions(+), 3 deletions(-)