From 101e8dfa2a8b045c6655bf2b3d6fba8d378453cd Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Mon, 4 Apr 2005 12:08:28 +0000
Subject: Fix timer code for ARM systems: make sure that udelay() does not
 reset timers so it's save to use udelay() in timeout code.

---
 cpu/arm920t/imx/interrupts.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'cpu/arm920t/imx/interrupts.c')

diff --git a/cpu/arm920t/imx/interrupts.c b/cpu/arm920t/imx/interrupts.c
index 12ae2faf28..2f2e754569 100644
--- a/cpu/arm920t/imx/interrupts.c
+++ b/cpu/arm920t/imx/interrupts.c
@@ -81,10 +81,13 @@ ulong get_timer_masked (void)
 
 void udelay_masked (unsigned long usec)
 {
-	ulong start = get_timer_masked();
+	ulong endtime = get_timer_masked() + usec;
+	signed long diff;
 
-	while (get_timer_masked () - start < usec )
-		/*NOP*/;
+	do {
+		ulong now = get_timer_masked ();
+		diff = endtime - now;
+	} while (diff >= 0);
 }
 
 void udelay (unsigned long usec)
-- 
cgit v1.2.1