LXR uboot/arch/xtensa/include/asm/atomic.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * Copyright (C) 2016 Cadence Design Systems Inc.
   4 */
   5
   6#ifndef _XTENSA_ATOMIC_H
   7#define _XTENSA_ATOMIC_H
   8
   9#include <asm/system.h>
  10
  11typedef struct { volatile int counter; } atomic_t;
  12
  13#define ATOMIC_INIT(i)  { (i) }
  14
  15#define atomic_read(v)          ((v)->counter)
  16#define atomic_set(v, i)        ((v)->counter = (i))
  17
  18static inline void atomic_add(int i, atomic_t *v)
  19{
  20        unsigned long flags;
  21
  22        local_irq_save(flags);
  23        v->counter += i;
  24        local_irq_restore(flags);
  25}
  26
  27static inline void atomic_sub(int i, atomic_t *v)
  28{
  29        unsigned long flags;
  30
  31        local_irq_save(flags);
  32        v->counter -= i;
  33        local_irq_restore(flags);
  34}
  35
  36static inline void atomic_inc(atomic_t *v)
  37{
  38        unsigned long flags;
  39
  40        local_irq_save(flags);
  41        ++v->counter;
  42        local_irq_restore(flags);
  43}
  44
  45static inline void atomic_dec(atomic_t *v)
  46{
  47        unsigned long flags;
  48
  49        local_irq_save(flags);
  50        --v->counter;
  51        local_irq_restore(flags);
  52}
  53
  54#endif
  55