powerpc: Merge smp-tbsync.c (the generic timebase sync routine)

Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 5 insertions, 184 deletions

diff --git a/arch/ppc64/Kconfig b/arch/ppc64/Kconfig
index 42677cc..b987164 100644
--- a/arch/ppc64/Kconfig
+++ b/arch/ppc64/Kconfig
@@ -89,12 +89,14 @@ config PPC_PMAC
 	bool "  Apple G5 based machines"
 	default y
 	select U3_DART
+	select GENERIC_TBSYNC
 
 config PPC_MAPLE
 	depends on PPC_MULTIPLATFORM
 	bool "  Maple 970FX Evaluation Board"
 	select U3_DART
 	select MPIC_BROKEN_U3
+	select GENERIC_TBSYNC
 	default n
 	help
           This option enables support for the Maple 970FX Evaluation Board.
@@ -182,6 +184,9 @@ config MPIC_BROKEN_U3
 	depends on PPC_MAPLE
 	default y
 
+config GENERIC_TBSYNC
+	def_bool n
+
 config PPC_PMAC64
 	bool
 	depends on PPC_PMAC
diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
index 430cb39..f597c29 100644
--- a/arch/ppc64/kernel/Makefile
+++ b/arch/ppc64/kernel/Makefile
@@ -51,11 +51,6 @@ obj-$(CONFIG_PPC_PMAC)		+= udbg_scc.o
 
 obj-$(CONFIG_PPC_MAPLE)		+= udbg_16550.o
 
-ifdef CONFIG_SMP
-obj-$(CONFIG_PPC_PMAC)		+= smp-tbsync.o
-obj-$(CONFIG_PPC_MAPLE)		+= smp-tbsync.o
-endif
-
 obj-$(CONFIG_KPROBES)		+= kprobes.o
 
 CFLAGS_ioctl32.o += -Ifs/
diff --git a/arch/ppc64/kernel/smp-tbsync.c b/arch/ppc64/kernel/smp-tbsync.c
deleted file mode 100644
index 7d8ec99..0000000
--- a/arch/ppc64/kernel/smp-tbsync.c
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- * Smp timebase synchronization for ppc.
- *
- * Copyright (C) 2003 Samuel Rydh (samuel@ibrium.se)
- *
- */
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/smp.h>
-#include <linux/unistd.h>
-#include <linux/init.h>
-#include <asm/atomic.h>
-#include <asm/smp.h>
-#include <asm/time.h>
-
-#define NUM_ITER		300
-
-enum {
-	kExit=0, kSetAndTest, kTest
-};
-
-static struct {
-	volatile long		tb;
-	volatile long		mark;
-	volatile int		cmd;
-	volatile int		handshake;
-	int			filler[3];
-
-	volatile int		ack;
-	int			filler2[7];
-
-	volatile int		race_result;
-} *tbsync;
-
-static volatile int		running;
-
-static void __devinit
-enter_contest( long mark, long add )
-{
-	while( (long)(mftb() - mark) < 0 )
-		tbsync->race_result = add;
-}
-
-void __devinit
-smp_generic_take_timebase( void )
-{
-	int cmd;
-	long tb;
-
-	local_irq_disable();
-	while( !running )
-		;
-	rmb();
-
-	for( ;; ) {
-		tbsync->ack = 1;
-		while( !tbsync->handshake )
-			;
-		rmb();
-
-		cmd = tbsync->cmd;
-		tb = tbsync->tb;
-		tbsync->ack = 0;
-		if( cmd == kExit )
-			return;
-
-		if( cmd == kSetAndTest ) {
-			while( tbsync->handshake )
-				;
-			asm volatile ("mttbl %0" :: "r" (tb & 0xfffffffful) );
-			asm volatile ("mttbu %0" :: "r" (tb >> 32) );
-		} else {
-			while( tbsync->handshake )
-				;
-		}
-		enter_contest( tbsync->mark, -1 );
-	}
-	local_irq_enable();
-}
-
-static int __devinit
-start_contest( int cmd, long offset, long num )
-{
-	int i, score=0;
-	long tb, mark;
-
-	tbsync->cmd = cmd;
-
-	local_irq_disable();
-	for( i=-3; i<num; ) {
-		tb = (long)mftb() + 400;
-		tbsync->tb = tb + offset;
-		tbsync->mark = mark = tb + 400;
-
-		wmb();
-
-		tbsync->handshake = 1;
-		while( tbsync->ack )
-			;
-
-		while( (long)(mftb() - tb) <= 0 )
-			;
-		tbsync->handshake = 0;
-		enter_contest( mark, 1 );
-
-		while( !tbsync->ack )
-			;
-
-	       	if ((tbsync->tb ^ (long)mftb()) & 0x8000000000000000ul)
-			continue;
-		if( i++ > 0 )
-			score += tbsync->race_result;
-	}
-	local_irq_enable();
-	return score;
-}
-
-void __devinit
-smp_generic_give_timebase( void )
-{
-	int i, score, score2, old, min=0, max=5000, offset=1000;
-
-	printk("Synchronizing timebase\n");
-
-	/* if this fails then this kernel won't work anyway... */
-	tbsync = kmalloc( sizeof(*tbsync), GFP_KERNEL );
-	memset( tbsync, 0, sizeof(*tbsync) );
-	mb();
-	running = 1;
-
-	while( !tbsync->ack )
-		;
-
-	printk("Got ack\n");
-
-	/* binary search */
-	for( old=-1 ; old != offset ; offset=(min+max)/2 ) {
-		score = start_contest( kSetAndTest, offset, NUM_ITER );
-
-		printk("score %d, offset %d\n", score, offset );
-
-		if( score > 0 )
-			max = offset;
-		else
-			min = offset;
-		old = offset;
-	}
-	score = start_contest( kSetAndTest, min, NUM_ITER );
-	score2 = start_contest( kSetAndTest, max, NUM_ITER );
-
-	printk( "Min %d (score %d), Max %d (score %d)\n", min, score, max, score2 );
-	score = abs( score );
-	score2 = abs( score2 );
-	offset = (score < score2) ? min : max;
-
-	/* guard against inaccurate mttb */
-	for( i=0; i<10; i++ ) {
-		start_contest( kSetAndTest, offset, NUM_ITER/10 );
-
-		if( (score2=start_contest(kTest, offset, NUM_ITER)) < 0 )
-			score2 = -score2;
-		if( score2 <= score || score2 < 20 )
-			break;
-	}
-	printk("Final offset: %d (%d/%d)\n", offset, score2, NUM_ITER );
-
-	/* exiting */
-	tbsync->cmd = kExit;
-	wmb();
-	tbsync->handshake = 1;
-	while( tbsync->ack )
-		;
-	tbsync->handshake = 0;
-	kfree( tbsync );
-	tbsync = NULL;
-	running = 0;
-}