From 3763be32d591cacf808c36390a8af3f2784cde5f Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@sunset.davemloft.net>
Date: Fri, 17 Feb 2006 12:33:13 -0800
Subject: [PATCH] [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>
---
 arch/sparc64/kernel/time.c  |  8 +-------
 arch/sparc64/lib/delay.c    | 19 ++++++++-----------
 include/asm-sparc64/timex.h |  6 ++++++
 3 files changed, 15 insertions(+), 18 deletions(-)

diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index 7041146f86f0..f6275adbc811 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -1029,11 +1029,10 @@ static void sparc64_start_timers(irqreturn_t (*cfunc)(int, void *, struct pt_reg
 }
 
 struct freq_table {
-	unsigned long udelay_val_ref;
 	unsigned long clock_tick_ref;
 	unsigned int ref_freq;
 };
-static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0, 0 };
+static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
 
 unsigned long sparc64_get_clock_tick(unsigned int cpu)
 {
@@ -1055,16 +1054,11 @@ static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val
 
 	if (!ft->ref_freq) {
 		ft->ref_freq = freq->old;
-		ft->udelay_val_ref = cpu_data(cpu).udelay_val;
 		ft->clock_tick_ref = cpu_data(cpu).clock_tick;
 	}
 	if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
 	    (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
 	    (val == CPUFREQ_RESUMECHANGE)) {
-		cpu_data(cpu).udelay_val =
-			cpufreq_scale(ft->udelay_val_ref,
-				      ft->ref_freq,
-				      freq->new);
 		cpu_data(cpu).clock_tick =
 			cpufreq_scale(ft->clock_tick_ref,
 				      ft->ref_freq,
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
diff --git a/include/asm-sparc64/timex.h b/include/asm-sparc64/timex.h
index 9e8d4175bcb2..2a5e4ebaad80 100644
--- a/include/asm-sparc64/timex.h
+++ b/include/asm-sparc64/timex.h
@@ -14,4 +14,10 @@
 typedef unsigned long cycles_t;
 #define get_cycles()	tick_ops->get_tick()
 
+#define ARCH_HAS_READ_CURRENT_TIMER	1
+#define read_current_timer(timer_val_p) 	\
+({	*timer_val_p = tick_ops->get_tick();	\
+	0;					\
+})
+
 #endif