timer: orion-timer: Fix problem in early_init_done()

It was noticed that Clearfog is currently broken with this newly
introduced early_init_done() function. Apparently the timer is enabled
here when U-Boot is run but not configured - at least not correctly.
Resulting in a hangup in the timer reading functions.

To fix this, also read the value of the reload register and check it's
value with the one written to by U-Boot. Only if this matches, the
init has already been done.

Fixes: 5387b093cb79 ("timer: orion-timer: Fix problem with early static variable")
Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Pali Rohár <pali@kernel.org>
Cc: Martin Rowe <martin.p.rowe@gmail.com>
Cc: Tony Dinh <mibodhi@gmail.com>
Cc: Pali Rohár <pali@kernel.org>
Cc: Michael Walle <michael@walle.cc>

diff --git a/drivers/timer/orion-timer.c b/drivers/timer/orion-timer.c
index 810a03d..9cab27f 100644 (file)
--- a/drivers/timer/orion-timer.c
+++ b/drivers/timer/orion-timer.c
@@ -25,7 +25,8 @@ struct orion_timer_priv {
 
 static bool early_init_done(void *base)
 {
-       if (readl(base + TIMER_CTRL) & TIMER0_EN)
+       if ((readl(base + TIMER_CTRL) & TIMER0_EN) &&
+           (readl(base + TIMER0_RELOAD) == ~0))
                return true;
        return false;
 }