powerpc: Merge spinlock.h

The result is mostly similar to the original ppc64 version but with
some adaptations for 32-bit compilation.

include/asm-ppc64 is now empty!

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

1 files changed, 0 insertions, 241 deletions

diff --git a/include/asm-ppc64/spinlock.h b/include/asm-ppc64/spinlock.h
deleted file mode 100644
index 7d84fb5e39f..00000000000
--- a/include/asm-ppc64/spinlock.h
+++ /dev/null
@@ -1,241 +0,0 @@
-#ifndef __ASM_SPINLOCK_H
-#define __ASM_SPINLOCK_H
-
-/*
- * Simple spin lock operations.  
- *
- * Copyright (C) 2001-2004 Paul Mackerras <paulus@au.ibm.com>, IBM
- * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
- * Copyright (C) 2002 Dave Engebretsen <engebret@us.ibm.com>, IBM
- *	Rework to support virtual processors
- *
- * Type of int is used as a full 64b word is not necessary.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * (the type definitions are in asm/spinlock_types.h)
- */
-#include <linux/config.h>
-#include <asm/paca.h>
-#include <asm/hvcall.h>
-#include <asm/iseries/hv_call.h>
-
-#define __raw_spin_is_locked(x)		((x)->slock != 0)
-
-/*
- * This returns the old value in the lock, so we succeeded
- * in getting the lock if the return value is 0.
- */
-static __inline__ unsigned long __spin_trylock(raw_spinlock_t *lock)
-{
-	unsigned long tmp, tmp2;
-
-	__asm__ __volatile__(
-"	lwz		%1,%3(13)		# __spin_trylock\n\
-1:	lwarx		%0,0,%2\n\
-	cmpwi		0,%0,0\n\
-	bne-		2f\n\
-	stwcx.		%1,0,%2\n\
-	bne-		1b\n\
-	isync\n\
-2:"	: "=&r" (tmp), "=&r" (tmp2)
-	: "r" (&lock->slock), "i" (offsetof(struct paca_struct, lock_token))
-	: "cr0", "memory");
-
-	return tmp;
-}
-
-static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock)
-{
-	return __spin_trylock(lock) == 0;
-}
-
-/*
- * On a system with shared processors (that is, where a physical
- * processor is multiplexed between several virtual processors),
- * there is no point spinning on a lock if the holder of the lock
- * isn't currently scheduled on a physical processor.  Instead
- * we detect this situation and ask the hypervisor to give the
- * rest of our timeslice to the lock holder.
- *
- * So that we can tell which virtual processor is holding a lock,
- * we put 0x80000000 | smp_processor_id() in the lock when it is
- * held.  Conveniently, we have a word in the paca that holds this
- * value.
- */
-
-#if defined(CONFIG_PPC_SPLPAR) || defined(CONFIG_PPC_ISERIES)
-/* We only yield to the hypervisor if we are in shared processor mode */
-#define SHARED_PROCESSOR (get_paca()->lppaca.shared_proc)
-extern void __spin_yield(raw_spinlock_t *lock);
-extern void __rw_yield(raw_rwlock_t *lock);
-#else /* SPLPAR || ISERIES */
-#define __spin_yield(x)	barrier()
-#define __rw_yield(x)	barrier()
-#define SHARED_PROCESSOR	0
-#endif
-
-static void __inline__ __raw_spin_lock(raw_spinlock_t *lock)
-{
-	while (1) {
-		if (likely(__spin_trylock(lock) == 0))
-			break;
-		do {
-			HMT_low();
-			if (SHARED_PROCESSOR)
-				__spin_yield(lock);
-		} while (unlikely(lock->slock != 0));
-		HMT_medium();
-	}
-}
-
-static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
-{
-	unsigned long flags_dis;
-
-	while (1) {
-		if (likely(__spin_trylock(lock) == 0))
-			break;
-		local_save_flags(flags_dis);
-		local_irq_restore(flags);
-		do {
-			HMT_low();
-			if (SHARED_PROCESSOR)
-				__spin_yield(lock);
-		} while (unlikely(lock->slock != 0));
-		HMT_medium();
-		local_irq_restore(flags_dis);
-	}
-}
-
-static __inline__ void __raw_spin_unlock(raw_spinlock_t *lock)
-{
-	__asm__ __volatile__("lwsync	# __raw_spin_unlock": : :"memory");
-	lock->slock = 0;
-}
-
-extern void __raw_spin_unlock_wait(raw_spinlock_t *lock);
-
-/*
- * Read-write spinlocks, allowing multiple readers
- * but only one writer.
- *
- * NOTE! it is quite common to have readers in interrupts
- * but no interrupt writers. For those circumstances we
- * can "mix" irq-safe locks - any writer needs to get a
- * irq-safe write-lock, but readers can get non-irqsafe
- * read-locks.
- */
-
-#define __raw_read_can_lock(rw)		((rw)->lock >= 0)
-#define __raw_write_can_lock(rw)	(!(rw)->lock)
-
-/*
- * This returns the old value in the lock + 1,
- * so we got a read lock if the return value is > 0.
- */
-static long __inline__ __read_trylock(raw_rwlock_t *rw)
-{
-	long tmp;
-
-	__asm__ __volatile__(
-"1:	lwarx		%0,0,%1		# read_trylock\n\
-	extsw		%0,%0\n\
-	addic.		%0,%0,1\n\
-	ble-		2f\n\
-	stwcx.		%0,0,%1\n\
-	bne-		1b\n\
-	isync\n\
-2:"	: "=&r" (tmp)
-	: "r" (&rw->lock)
-	: "cr0", "xer", "memory");
-
-	return tmp;
-}
-
-/*
- * This returns the old value in the lock,
- * so we got the write lock if the return value is 0.
- */
-static __inline__ long __write_trylock(raw_rwlock_t *rw)
-{
-	long tmp, tmp2;
-
-	__asm__ __volatile__(
-"	lwz		%1,%3(13)	# write_trylock\n\
-1:	lwarx		%0,0,%2\n\
-	cmpwi		0,%0,0\n\
-	bne-		2f\n\
-	stwcx.		%1,0,%2\n\
-	bne-		1b\n\
-	isync\n\
-2:"	: "=&r" (tmp), "=&r" (tmp2)
-	: "r" (&rw->lock), "i" (offsetof(struct paca_struct, lock_token))
-	: "cr0", "memory");
-
-	return tmp;
-}
-
-static void __inline__ __raw_read_lock(raw_rwlock_t *rw)
-{
-	while (1) {
-		if (likely(__read_trylock(rw) > 0))
-			break;
-		do {
-			HMT_low();
-			if (SHARED_PROCESSOR)
-				__rw_yield(rw);
-		} while (unlikely(rw->lock < 0));
-		HMT_medium();
-	}
-}
-
-static void __inline__ __raw_write_lock(raw_rwlock_t *rw)
-{
-	while (1) {
-		if (likely(__write_trylock(rw) == 0))
-			break;
-		do {
-			HMT_low();
-			if (SHARED_PROCESSOR)
-				__rw_yield(rw);
-		} while (unlikely(rw->lock != 0));
-		HMT_medium();
-	}
-}
-
-static int __inline__ __raw_read_trylock(raw_rwlock_t *rw)
-{
-	return __read_trylock(rw) > 0;
-}
-
-static int __inline__ __raw_write_trylock(raw_rwlock_t *rw)
-{
-	return __write_trylock(rw) == 0;
-}
-
-static void __inline__ __raw_read_unlock(raw_rwlock_t *rw)
-{
-	long tmp;
-
-	__asm__ __volatile__(
-	"eieio				# read_unlock\n\
-1:	lwarx		%0,0,%1\n\
-	addic		%0,%0,-1\n\
-	stwcx.		%0,0,%1\n\
-	bne-		1b"
-	: "=&r"(tmp)
-	: "r"(&rw->lock)
-	: "cr0", "memory");
-}
-
-static __inline__ void __raw_write_unlock(raw_rwlock_t *rw)
-{
-	__asm__ __volatile__("lwsync	# write_unlock": : :"memory");
-	rw->lock = 0;
-}
-
-#endif /* __ASM_SPINLOCK_H */