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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2016 ARM Ltd.
*
* ARM and ARM64 barrier instructions
* split from armv7.h to allow sharing between ARM and ARM64
*
* Original copyright in armv7.h was:
* (C) Copyright 2010 Texas Instruments, <www.ti.com> Aneesh V <aneesh@ti.com>
*
* Much of the original barrier code was contributed by:
* Valentine Barshak <valentine.barshak@cogentembedded.com>
*/
#ifndef __BARRIERS_H__
#define __BARRIERS_H__
#ifndef __ASSEMBLY__
#ifndef CONFIG_ARM64
/*
* CP15 Barrier instructions
* Please note that we have separate barrier instructions in ARMv7
* However, we use the CP15 based instructtions because we use
* -march=armv5 in U-Boot
*/
#define CP15ISB asm volatile ("mcr p15, 0, %0, c7, c5, 4" : : "r" (0))
#define CP15DSB asm volatile ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0))
#define CP15DMB asm volatile ("mcr p15, 0, %0, c7, c10, 5" : : "r" (0))
#endif /* !CONFIG_ARM64 */
#if __LINUX_ARM_ARCH__ >= 7
#define ISB asm volatile ("isb sy" : : : "memory")
#define DSB asm volatile ("dsb sy" : : : "memory")
#define DMB asm volatile ("dmb sy" : : : "memory")
#elif __LINUX_ARM_ARCH__ == 6
#define ISB CP15ISB
#define DSB CP15DSB
#define DMB CP15DMB
#else
#define ISB asm volatile ("" : : : "memory")
#define DSB CP15DSB
#define DMB asm volatile ("" : : : "memory")
#endif
#define isb() ISB
#define dsb() DSB
#define dmb() DMB
#endif /* __ASSEMBLY__ */
#endif /* __BARRIERS_H__ */
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