1 files changed, 50 insertions, 0 deletions
diff --git a/arch/csky/include/asm/checksum.h b/arch/csky/include/asm/checksum.h
new file mode 100644
index 0000000000000..7685824291b1d
--- /dev/null
+++ b/arch/csky/include/asm/checksum.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_CHECKSUM_H
+#define __ASM_CSKY_CHECKSUM_H
+
+#include <linux/in6.h>
+#include <asm/byteorder.h>
+
+static inline __sum16 csum_fold(__wsum csum)
+{
+	u32 tmp;
+
+	asm volatile(
+	"mov	%1, %0\n"
+	"rori	%0, 16\n"
+	"addu	%0, %1\n"
+	"lsri	%0, 16\n"
+	: "=r"(csum), "=r"(tmp)
+	: "0"(csum));
+
+	return (__force __sum16) ~csum;
+}
+#define csum_fold csum_fold
+
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+		unsigned short len, unsigned short proto, __wsum sum)
+{
+	asm volatile(
+	"clrc\n"
+	"addc    %0, %1\n"
+	"addc    %0, %2\n"
+	"addc    %0, %3\n"
+	"inct    %0\n"
+	: "=r"(sum)
+	: "r"((__force u32)saddr), "r"((__force u32)daddr),
+#ifdef __BIG_ENDIAN
+	"r"(proto + len),
+#else
+	"r"((proto + len) << 8),
+#endif
+	"0" ((__force unsigned long)sum)
+	: "cc");
+	return sum;
+}
+#define csum_tcpudp_nofold csum_tcpudp_nofold
+
+#include <asm-generic/checksum.h>
+
+#endif /* __ASM_CSKY_CHECKSUM_H */