blob: 7eaea27cdd67c19183321adbb4153493bdf7f44b [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
* Copied from the kernel sources:
* Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
* Copyright (C) 2002 Paul Mundt
* A brief note on ctrl_barrier(), the control register write barrier.
* Legacy SH cores typically require a sequence of 8 nops after
* modification of a control register in order for the changes to take
* effect. On newer cores (like the sh4a and sh5) this is accomplished
* with icbi.
* Also note that on sh4a in the icbi case we can forego a synco for the
* write barrier, as it's not necessary for control registers.
* Historically we have only done this type of barrier for the MMUCR, but
* it's also necessary for the CCR, so we make it generic here instead.
#if defined(__SH4A__)
#define mb() __asm__ __volatile__ ("synco": : :"memory")
#define rmb() mb()
#define wmb() mb()
#include <asm-generic/barrier.h>