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/pxa/interrupts.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

(limited to 'cpu/pxa')

diff --git a/cpu/pxa/interrupts.c b/cpu/pxa/interrupts.c
index b335a82..0479a10 100644
--- a/cpu/pxa/interrupts.c
+++ b/cpu/pxa/interrupts.c
@@ -190,6 +190,8 @@ ulong get_timer_masked (void)
 void udelay_masked (unsigned long usec)
 {
 	ulong tmo;
+	ulong endtime;
+	signed long diff;
 
 	if (usec >= 1000) {
 		tmo = usec / 1000;
@@ -200,10 +202,12 @@ void udelay_masked (unsigned long usec)
 		tmo /= (1000*1000);
 	}
 
-	reset_timer_masked ();
+	endtime = get_timer_masked () + tmo;
 
-	while (tmo >= get_timer_masked ())
-		/*NOP*/;
+	do {
+		ulong now = get_timer_masked ();
+		diff = endtime - now;
+	} while (diff >= 0);
 }
 
 /*
-- 
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