[SPARC64]: Define ARCH_HAS_READ_CURRENT_TIMER.

This gives more consistent bogomips and delay() semantics,
especially on sun4v.  It gives weird looking values though...

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 11 deletions

diff --git a/arch/sparc64/lib/delay.c b/arch/sparc64/lib/delay.c
index e8808727617a..fb27e54a03ee 100644
--- a/arch/sparc64/lib/delay.c
+++ b/arch/sparc64/lib/delay.c
@@ -1,6 +1,6 @@
 /* delay.c: Delay loops for sparc64
  *
- * Copyright (C) 2004 David S. Miller <davem@redhat.com>
+ * Copyright (C) 2004, 2006 David S. Miller <davem@davemloft.net>
  *
  * Based heavily upon x86 variant which is:
  *      Copyright (C) 1993 Linus Torvalds
@@ -8,19 +8,16 @@
  */
 
 #include <linux/delay.h>
+#include <asm/timer.h>
 
 void __delay(unsigned long loops)
 {
-        __asm__ __volatile__(
-"       b,pt    %%xcc, 1f\n"
-"        cmp    %0, 0\n"
-"       .align  32\n"
-"1:\n"
-"       bne,pt  %%xcc, 1b\n"
-"        subcc  %0, 1, %0\n"
-        : "=&r" (loops)
-        : "0" (loops)
-        : "cc");
+        unsigned long bclock, now;
+        
+        bclock = tick_ops->get_tick();
+        do {
+                now = tick_ops->get_tick();
+        } while ((now-bclock) < loops);
 }
 
 /* We used to multiply by HZ after shifting down by 32 bits