1 files changed, 88 insertions, 0 deletions
diff --git a/arch/csky/include/asm/barrier.h b/arch/csky/include/asm/barrier.h
new file mode 100644
index 000000000..15de58b10
--- /dev/null
+++ b/arch/csky/include/asm/barrier.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_BARRIER_H
+#define __ASM_CSKY_BARRIER_H
+
+#ifndef __ASSEMBLY__
+
+#define nop()	asm volatile ("nop\n":::"memory")
+
+#ifdef CONFIG_SMP
+
+/*
+ * bar.brwarws: ordering barrier for all load/store instructions
+ *              before/after
+ *
+ * |31|30 26|25 21|20 16|15  10|9   5|4           0|
+ *  1  10000 00000 00000 100001	00001 0 bw br aw ar
+ *
+ * b: before
+ * a: after
+ * r: read
+ * w: write
+ *
+ * Here are all combinations:
+ *
+ * bar.brw
+ * bar.br
+ * bar.bw
+ * bar.arw
+ * bar.ar
+ * bar.aw
+ * bar.brwarw
+ * bar.brarw
+ * bar.bwarw
+ * bar.brwar
+ * bar.brwaw
+ * bar.brar
+ * bar.bwaw
+ */
+#define FULL_FENCE		".long 0x842fc000\n"
+#define ACQUIRE_FENCE		".long 0x8427c000\n"
+#define RELEASE_FENCE		".long 0x842ec000\n"
+
+#define __bar_brw()	asm volatile (".long 0x842cc000\n":::"memory")
+#define __bar_br()	asm volatile (".long 0x8424c000\n":::"memory")
+#define __bar_bw()	asm volatile (".long 0x8428c000\n":::"memory")
+#define __bar_arw()	asm volatile (".long 0x8423c000\n":::"memory")
+#define __bar_ar()	asm volatile (".long 0x8421c000\n":::"memory")
+#define __bar_aw()	asm volatile (".long 0x8422c000\n":::"memory")
+#define __bar_brwarw()	asm volatile (FULL_FENCE:::"memory")
+#define __bar_brarw()	asm volatile (ACQUIRE_FENCE:::"memory")
+#define __bar_bwarw()	asm volatile (".long 0x842bc000\n":::"memory")
+#define __bar_brwar()	asm volatile (".long 0x842dc000\n":::"memory")
+#define __bar_brwaw()	asm volatile (RELEASE_FENCE:::"memory")
+#define __bar_brar()	asm volatile (".long 0x8425c000\n":::"memory")
+#define __bar_brar()	asm volatile (".long 0x8425c000\n":::"memory")
+#define __bar_bwaw()	asm volatile (".long 0x842ac000\n":::"memory")
+
+#define __smp_mb()	__bar_brwarw()
+#define __smp_rmb()	__bar_brar()
+#define __smp_wmb()	__bar_bwaw()
+
+#define __smp_acquire_fence()	__bar_brarw()
+#define __smp_release_fence()	__bar_brwaw()
+
+#endif /* CONFIG_SMP */
+
+/*
+ * sync:        completion barrier, all sync.xx instructions
+ *              guarantee the last response received by bus transaction
+ *              made by ld/st instructions before sync.s
+ * sync.s:      inherit from sync, but also shareable to other cores
+ * sync.i:      inherit from sync, but also flush cpu pipeline
+ * sync.is:     the same with sync.i + sync.s
+ */
+#define mb()		asm volatile ("sync\n":::"memory")
+
+#ifdef CONFIG_CPU_HAS_CACHEV2
+/*
+ * Using three sync.is to prevent speculative PTW
+ */
+#define sync_is()	asm volatile ("sync.is\nsync.is\nsync.is\n":::"memory")
+#endif
+
+#include <asm-generic/barrier.h>
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_CSKY_BARRIER_H */