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 arch_atomic_read(v)             READ_ONCE((v)->counter)
  23 #define arch_atomic_set(v,i)            WRITE_ONCE((v)->counter, (i))
  24
  25 #if defined(CONFIG_GUSA_RB)
  26 #include <asm/atomic-grb.h>
  27 #elif defined(CONFIG_CPU_SH4A)
  28 #include <asm/atomic-llsc.h>
  29 #else
  30 #include <asm/atomic-irq.h>
  31 #endif
  32
  33 #define arch_atomic_xchg(v, new)        (arch_xchg(&((v)->counter), new))
  34 #define arch_atomic_cmpxchg(v, o, n)    (arch_cmpxchg(&((v)->counter), (o), (n)))
  35
  36 #endif /* CONFIG_CPU_J2 */
  37
  38 #endif /* __ASM_SH_ATOMIC_H */