summaryrefslogtreecommitdiffstats
path: root/arch/sh/include/asm/spinlock.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/include/asm/spinlock.h')
-rw-r--r--arch/sh/include/asm/spinlock.h222
1 files changed, 6 insertions, 216 deletions
diff --git a/arch/sh/include/asm/spinlock.h b/arch/sh/include/asm/spinlock.h
index 416834b60ad0..c2c61ea6a8e2 100644
--- a/arch/sh/include/asm/spinlock.h
+++ b/arch/sh/include/asm/spinlock.h
@@ -11,222 +11,12 @@
#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"
+#if defined(CONFIG_CPU_SH4A)
+#include <asm/spinlock-llsc.h>
+#elif defined(CONFIG_CPU_J2)
+#include <asm/spinlock-cas.h>
+#else
+#error "The configured cpu type does not support spinlocks"
#endif
-#include <asm/barrier.h>
-#include <asm/processor.h>
-
-/*
- * Your basic SMP spinlocks, allowing only a single CPU anywhere
- */
-
-#define arch_spin_is_locked(x) ((x)->lock <= 0)
-#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
-
-static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
-{
- smp_cond_load_acquire(&lock->lock, VAL > 0);
-}
-
-/*
- * 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 arch_spin_lock(arch_spinlock_t *lock)
-{
- unsigned long tmp;
- unsigned long oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_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 arch_spin_unlock(arch_spinlock_t *lock)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "mov #1, %0 ! arch_spin_unlock \n\t"
- "mov.l %0, @%1 \n\t"
- : "=&z" (tmp)
- : "r" (&lock->lock)
- : "t", "memory"
- );
-}
-
-static inline int arch_spin_trylock(arch_spinlock_t *lock)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_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 arch_read_can_lock(x) ((x)->lock > 0)
-
-/**
- * write_can_lock - would write_trylock() succeed?
- * @lock: the rwlock in question.
- */
-#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
-
-static inline void arch_read_lock(arch_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! arch_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 arch_read_unlock(arch_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! arch_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 arch_write_lock(arch_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! arch_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 arch_write_unlock(arch_rwlock_t *rw)
-{
- __asm__ __volatile__ (
- "mov.l %1, @%0 ! arch_write_unlock \n\t"
- :
- : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
- : "t", "memory"
- );
-}
-
-static inline int arch_read_trylock(arch_rwlock_t *rw)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_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 arch_write_trylock(arch_rwlock_t *rw)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_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 arch_read_lock_flags(lock, flags) arch_read_lock(lock)
-#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
-
-#define arch_spin_relax(lock) cpu_relax()
-#define arch_read_relax(lock) cpu_relax()
-#define arch_write_relax(lock) cpu_relax()
-
#endif /* __ASM_SH_SPINLOCK_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 13:17:12 +0000