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 7041146f86f02..f6275adbc8110 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 e8808727617a1..fb27e54a03ee1 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 9e8d4175bcb25..2a5e4ebaad805 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
--
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