From 917f0af9e5a9ceecf9e72537fabb501254ba321d Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 9 Jun 2008 14:01:46 +1000 Subject: powerpc: Remove arch/ppc and include/asm-ppc All the maintained platforms are now in arch/powerpc, so the old arch/ppc stuff can now go away. Acked-by: Adrian Bunk Acked-by: Arnd Bergmann Acked-by: Becky Bruce Acked-by: Benjamin Herrenschmidt Acked-by: Geert Uytterhoeven Acked-by: Grant Likely Acked-by: Jochen Friedrich Acked-by: John Linn Acked-by: Jon Loeliger Acked-by: Josh Boyer Acked-by: Kumar Gala Acked-by: Olof Johansson Acked-by: Peter Korsgaard Acked-by: Scott Wood Acked-by: Sean MacLennan Acked-by: Segher Boessenkool Acked-by: Stefan Roese Acked-by: Stephen Neuendorffer Acked-by: Wolfgang Denk Signed-off-by: Paul Mackerras --- arch/ppc/kernel/smp-tbsync.c | 180 ------------------------------------------- 1 file changed, 180 deletions(-) delete mode 100644 arch/ppc/kernel/smp-tbsync.c (limited to 'arch/ppc/kernel/smp-tbsync.c') diff --git a/arch/ppc/kernel/smp-tbsync.c b/arch/ppc/kernel/smp-tbsync.c deleted file mode 100644 index d0cf3f86931..00000000000 --- a/arch/ppc/kernel/smp-tbsync.c +++ /dev/null @@ -1,180 +0,0 @@ -/* - * Smp timebase synchronization for ppc. - * - * Copyright (C) 2003 Samuel Rydh (samuel@ibrium.se) - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#define NUM_ITER 300 - -enum { - kExit=0, kSetAndTest, kTest -}; - -static struct { - volatile int tbu; - volatile int tbl; - volatile int 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( int mark, int add ) -{ - while( (int)(get_tbl() - mark) < 0 ) - tbsync->race_result = add; -} - -void __devinit -smp_generic_take_timebase( void ) -{ - int cmd, tbl, tbu; - unsigned long flags; - - local_irq_save(flags); - while( !running ) - ; - rmb(); - - for( ;; ) { - tbsync->ack = 1; - while( !tbsync->handshake ) - ; - rmb(); - - cmd = tbsync->cmd; - tbl = tbsync->tbl; - tbu = tbsync->tbu; - tbsync->ack = 0; - if( cmd == kExit ) - break; - - if( cmd == kSetAndTest ) { - while( tbsync->handshake ) - ; - asm volatile ("mttbl %0" :: "r" (tbl) ); - asm volatile ("mttbu %0" :: "r" (tbu) ); - } else { - while( tbsync->handshake ) - ; - } - enter_contest( tbsync->mark, -1 ); - } - local_irq_restore(flags); -} - -static int __devinit -start_contest( int cmd, int offset, int num ) -{ - int i, tbu, tbl, mark, score=0; - - tbsync->cmd = cmd; - - local_irq_disable(); - for( i=-3; itbu = tbu = get_tbu(); - tbsync->tbl = tbl + offset; - tbsync->mark = mark = tbl + 400; - - wmb(); - - tbsync->handshake = 1; - while( tbsync->ack ) - ; - - while( (int)(get_tbl() - tbl) <= 0 ) - ; - tbsync->handshake = 0; - enter_contest( mark, 1 ); - - while( !tbsync->ack ) - ; - - if( tbsync->tbu != get_tbu() || ((tbsync->tbl ^ get_tbl()) & 0x80000000) ) - 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 = kzalloc( sizeof(*tbsync), GFP_KERNEL ); - mb(); - running = 1; - - while( !tbsync->ack ) - ; - - /* 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; - - /* all done */ - smp_tb_synchronized = 1; -} -- cgit v1.2.3