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ARM64: Add support for some of atomic64 operations
These functions are needed in UBI/UBIFS on ZynqMP platform (ARM64). Signed-off-by: Adam Oleksy <adam.oleksy@nokia.com> Cc: Albert Aribaud <albert.u.boot@aribaud.net>
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1 changed files with 67 additions and 1 deletions
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@ -21,6 +21,11 @@
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#endif
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typedef struct { volatile int counter; } atomic_t;
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#if BITS_PER_LONG == 32
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typedef struct { volatile long long counter; } atomic64_t;
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#else /* BIT_PER_LONG == 32 */
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typedef struct { volatile long counter; } atomic64_t;
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#endif
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#define ATOMIC_INIT(i) { (i) }
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@ -28,7 +33,9 @@ typedef struct { volatile int counter; } atomic_t;
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#include <asm/proc-armv/system.h>
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#define atomic_read(v) ((v)->counter)
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#define atomic_set(v,i) (((v)->counter) = (i))
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#define atomic_set(v, i) (((v)->counter) = (i))
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#define atomic64_read(v) atomic_read(v)
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#define atomic64_set(v, i) atomic_set(v, i)
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static inline void atomic_add(int i, volatile atomic_t *v)
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{
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@ -101,6 +108,65 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
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local_irq_restore(flags);
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}
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#if BITS_PER_LONG == 32
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static inline void atomic64_add(long long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter += i;
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local_irq_restore(flags);
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}
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static inline void atomic64_sub(long long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter -= i;
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local_irq_restore(flags);
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}
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#else /* BIT_PER_LONG == 32 */
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static inline void atomic64_add(long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter += i;
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local_irq_restore(flags);
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}
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static inline void atomic64_sub(long i, volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter -= i;
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local_irq_restore(flags);
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}
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#endif
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static inline void atomic64_inc(volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter += 1;
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local_irq_restore(flags);
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}
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static inline void atomic64_dec(volatile atomic64_t *v)
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{
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unsigned long flags = 0;
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local_irq_save(flags);
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v->counter -= 1;
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local_irq_restore(flags);
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}
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/* Atomic operations are already serializing on ARM */
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#define smp_mb__before_atomic_dec() barrier()
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#define smp_mb__after_atomic_dec() barrier()
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