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mips: Add arch/mips/include/asm/atomic.h

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This is needed for the UBIFS support. The file is a copy of
arch/xtensa/include/asm/atomic.h

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Stefan Roese 2018-08-16 15:27:29 +02:00 committed by Daniel Schwierzeck
parent 46203baf66
commit 503f6f759c
1 changed files with 54 additions and 0 deletions
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54
arch/mips/include/asm/atomic.h Normal file
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2016 Cadence Design Systems Inc.
*/
#ifndef _MIPS_ATOMIC_H
#define _MIPS_ATOMIC_H
#include <asm/system.h>
typedef struct { volatile int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v, i) ((v)->counter = (i))
static inline void atomic_add(int i, atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
v->counter += i;
local_irq_restore(flags);
}
static inline void atomic_sub(int i, atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
v->counter -= i;
local_irq_restore(flags);
}
static inline void atomic_inc(atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
++v->counter;
local_irq_restore(flags);
}
static inline void atomic_dec(atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
--v->counter;
local_irq_restore(flags);
}
#endif