arch/blackfin/include/asm/barrier.h

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *               Tony Kou (tonyko@lineo.ca)
   4  *
   5  * Licensed under the GPL-2 or later
   6  */
   7
   8 #ifndef _BLACKFIN_BARRIER_H
   9 #define _BLACKFIN_BARRIER_H
  10
  11 #include <asm/cache.h>
  12
  13 #define nop()  __asm__ __volatile__ ("nop;\n\t" : : )
  14
  15 /*
  16  * Force strict CPU ordering.
  17  */
  18 #ifdef CONFIG_SMP
  19
  20 #ifdef __ARCH_SYNC_CORE_DCACHE
  21 /* Force Core data cache coherence */
  22 # define mb()   do { barrier(); smp_check_barrier(); smp_mark_barrier(); } while (0)
  23 # define rmb()  do { barrier(); smp_check_barrier(); } while (0)
  24 # define wmb()  do { barrier(); smp_mark_barrier(); } while (0)
  25 # define read_barrier_depends() do { barrier(); smp_check_barrier(); } while (0)
  26 #else
  27 # define mb()   barrier()
  28 # define rmb()  barrier()
  29 # define wmb()  barrier()
  30 # define read_barrier_depends() do { } while (0)
  31 #endif
  32
  33 #else /* !CONFIG_SMP */
  34
  35 #define mb()    barrier()
  36 #define rmb()   barrier()
  37 #define wmb()   barrier()
  38 #define read_barrier_depends()  do { } while (0)
  39
  40 #endif /* !CONFIG_SMP */
  41
  42 #define smp_mb()  mb()
  43 #define smp_rmb() rmb()
  44 #define smp_wmb() wmb()
  45 #define set_mb(var, value) do { var = value; mb(); } while (0)
  46 #define smp_read_barrier_depends()      read_barrier_depends()
  47
  48 #endif /* _BLACKFIN_BARRIER_H */