powerpc: mpc83xx: Fix timer value calculation

TBU and TBL are specified as two 32-bit registers that form a 64-bit
value, but the calculation only shifted TBU by 16 bits.

Fix this by actually shifting 32 bits.

Reviewed-by: Sinan Akman <sinan@writeme.com>
Signed-off-by: J. Neuschäfer <j.ne@posteo.net>

diff --git a/drivers/timer/mpc83xx_timer.c b/drivers/timer/mpc83xx_timer.c
index 9da7447..f92009e 100644 (file)
--- a/drivers/timer/mpc83xx_timer.c
+++ b/drivers/timer/mpc83xx_timer.c
@@ -206,7 +206,7 @@ static u64 mpc83xx_timer_get_count(struct udevice *dev)
                tbl = mftb();
        } while (tbu != mftbu());
 
-       return (tbu * 0x10000ULL) + tbl;
+       return (uint64_t)tbu << 32 | tbl;
 }
 
 static int mpc83xx_timer_probe(struct udevice *dev)