arch/csky/include/asm/barrier.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4 #ifndef __ASM_CSKY_BARRIER_H
   5 #define __ASM_CSKY_BARRIER_H
   6
   7 #ifndef __ASSEMBLY__
   8
   9 #define nop()   asm volatile ("nop\n":::"memory")
  10
  11 /*
  12  * sync:        completion barrier, all sync.xx instructions
  13  *              guarantee the last response recieved by bus transaction
  14  *              made by ld/st instructions before sync.s
  15  * sync.s:      inherit from sync, but also shareable to other cores
  16  * sync.i:      inherit from sync, but also flush cpu pipeline
  17  * sync.is:     the same with sync.i + sync.s
  18  *
  19  * bar.brwarw:  ordering barrier for all load/store instructions before it
  20  * bar.brwarws: ordering barrier for all load/store instructions before it
  21  *                                              and shareable to other cores
  22  * bar.brar:    ordering barrier for all load       instructions before it
  23  * bar.brars:   ordering barrier for all load       instructions before it
  24  *                                              and shareable to other cores
  25  * bar.bwaw:    ordering barrier for all store      instructions before it
  26  * bar.bwaws:   ordering barrier for all store      instructions before it
  27  *                                              and shareable to other cores
  28  */
  29
  30 #ifdef CONFIG_CPU_HAS_CACHEV2
  31 #define mb()            asm volatile ("sync.s\n":::"memory")
  32
  33 #ifdef CONFIG_SMP
  34 #define __smp_mb()      asm volatile ("bar.brwarws\n":::"memory")
  35 #define __smp_rmb()     asm volatile ("bar.brars\n":::"memory")
  36 #define __smp_wmb()     asm volatile ("bar.bwaws\n":::"memory")
  37 #endif /* CONFIG_SMP */
  38
  39 #define sync_is()       asm volatile ("sync.is\n":::"memory")
  40
  41 #else /* !CONFIG_CPU_HAS_CACHEV2 */
  42 #define mb()            asm volatile ("sync\n":::"memory")
  43 #endif
  44
  45 #include <asm-generic/barrier.h>
  46
  47 #endif /* __ASSEMBLY__ */
  48 #endif /* __ASM_CSKY_BARRIER_H */