aboutsummaryrefslogtreecommitdiff
path: root/include/asm-sh/spinlock.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-sh/spinlock.h')
-rw-r--r--include/asm-sh/spinlock.h223
1 files changed, 0 insertions, 223 deletions
diff --git a/include/asm-sh/spinlock.h b/include/asm-sh/spinlock.h
deleted file mode 100644
index e793181d64d..00000000000
--- a/include/asm-sh/spinlock.h
+++ /dev/null
@@ -1,223 +0,0 @@
-/*
- * include/asm-sh/spinlock.h
- *
- * Copyright (C) 2002, 2003 Paul Mundt
- * Copyright (C) 2006, 2007 Akio Idehara
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#ifndef __ASM_SH_SPINLOCK_H
-#define __ASM_SH_SPINLOCK_H
-
-/*
- * The only locking implemented here uses SH-4A opcodes. For others,
- * split this out as per atomic-*.h.
- */
-#ifndef CONFIG_CPU_SH4A
-#error "Need movli.l/movco.l for spinlocks"
-#endif
-
-/*
- * Your basic SMP spinlocks, allowing only a single CPU anywhere
- */
-
-#define __raw_spin_is_locked(x) ((x)->lock <= 0)
-#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
-#define __raw_spin_unlock_wait(x) \
- do { cpu_relax(); } while ((x)->lock)
-
-/*
- * Simple spin lock operations. There are two variants, one clears IRQ's
- * on the local processor, one does not.
- *
- * We make no fairness assumptions. They have a cost.
- */
-static inline void __raw_spin_lock(raw_spinlock_t *lock)
-{
- unsigned long tmp;
- unsigned long oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! __raw_spin_lock \n\t"
- "mov %0, %1 \n\t"
- "mov #0, %0 \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "cmp/pl %1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&lock->lock)
- : "t", "memory"
- );
-}
-
-static inline void __raw_spin_unlock(raw_spinlock_t *lock)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "mov #1, %0 ! __raw_spin_unlock \n\t"
- "mov.l %0, @%1 \n\t"
- : "=&z" (tmp)
- : "r" (&lock->lock)
- : "t", "memory"
- );
-}
-
-static inline int __raw_spin_trylock(raw_spinlock_t *lock)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! __raw_spin_trylock \n\t"
- "mov %0, %1 \n\t"
- "mov #0, %0 \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "synco \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&lock->lock)
- : "t", "memory"
- );
-
- return oldval;
-}
-
-/*
- * 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.
- */
-
-/**
- * read_can_lock - would read_trylock() succeed?
- * @lock: the rwlock in question.
- */
-#define __raw_read_can_lock(x) ((x)->lock > 0)
-
-/**
- * write_can_lock - would write_trylock() succeed?
- * @lock: the rwlock in question.
- */
-#define __raw_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
-
-static inline void __raw_read_lock(raw_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! __raw_read_lock \n\t"
- "cmp/pl %0 \n\t"
- "bf 1b \n\t"
- "add #-1, %0 \n\t"
- "movco.l %0, @%1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp)
- : "r" (&rw->lock)
- : "t", "memory"
- );
-}
-
-static inline void __raw_read_unlock(raw_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! __raw_read_unlock \n\t"
- "add #1, %0 \n\t"
- "movco.l %0, @%1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp)
- : "r" (&rw->lock)
- : "t", "memory"
- );
-}
-
-static inline void __raw_write_lock(raw_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! __raw_write_lock \n\t"
- "cmp/hs %2, %0 \n\t"
- "bf 1b \n\t"
- "sub %2, %0 \n\t"
- "movco.l %0, @%1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp)
- : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
- : "t", "memory"
- );
-}
-
-static inline void __raw_write_unlock(raw_rwlock_t *rw)
-{
- __asm__ __volatile__ (
- "mov.l %1, @%0 ! __raw_write_unlock \n\t"
- :
- : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
- : "t", "memory"
- );
-}
-
-static inline int __raw_read_trylock(raw_rwlock_t *rw)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! __raw_read_trylock \n\t"
- "mov %0, %1 \n\t"
- "cmp/pl %0 \n\t"
- "bf 2f \n\t"
- "add #-1, %0 \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "2: \n\t"
- "synco \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&rw->lock)
- : "t", "memory"
- );
-
- return (oldval > 0);
-}
-
-static inline int __raw_write_trylock(raw_rwlock_t *rw)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! __raw_write_trylock \n\t"
- "mov %0, %1 \n\t"
- "cmp/hs %3, %0 \n\t"
- "bf 2f \n\t"
- "sub %3, %0 \n\t"
- "2: \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "synco \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
- : "t", "memory"
- );
-
- return (oldval > (RW_LOCK_BIAS - 1));
-}
-
-#define _raw_spin_relax(lock) cpu_relax()
-#define _raw_read_relax(lock) cpu_relax()
-#define _raw_write_relax(lock) cpu_relax()
-
-#endif /* __ASM_SH_SPINLOCK_H */