LXR linux/arch/sh/include/asm/atomic.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_ATOMIC_H
   3#define __ASM_SH_ATOMIC_H
   4
   5#if defined(CONFIG_CPU_J2)
   6
   7#include <asm-generic/atomic.h>
   8
   9#else
  10
  11/*
  12 * Atomic operations that C can't guarantee us.  Useful for
  13 * resource counting etc..
  14 *
  15 */
  16
  17#include <linux/compiler.h>
  18#include <linux/types.h>
  19#include <asm/cmpxchg.h>
  20#include <asm/barrier.h>
  21
  22#define ATOMIC_INIT(i)  { (i) }
  23
  24#define atomic_read(v)          READ_ONCE((v)->counter)
  25#define atomic_set(v,i)         WRITE_ONCE((v)->counter, (i))
  26
  27#if defined(CONFIG_GUSA_RB)
  28#include <asm/atomic-grb.h>
  29#elif defined(CONFIG_CPU_SH4A)
  30#include <asm/atomic-llsc.h>
  31#else
  32#include <asm/atomic-irq.h>
  33#endif
  34
  35#define atomic_xchg(v, new)             (xchg(&((v)->counter), new))
  36#define atomic_cmpxchg(v, o, n)         (cmpxchg(&((v)->counter), (o), (n)))
  37
  38#endif /* CONFIG_CPU_J2 */
  39
  40#endif /* __ASM_SH_ATOMIC_H */
  41