diff --git a/arch/mips/mach-octeon/include/mach/cvmx-sriomaintx-defs.h b/arch/mips/mach-octeon/include/mach/cvmx-sriomaintx-defs.h
new file mode 100644
index 0000000..2558e7b
--- /dev/null
+++ b/arch/mips/mach-octeon/include/mach/cvmx-sriomaintx-defs.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Marvell International Ltd.
+ */
+
+#ifndef __CVMX_SRIOMAINTX_DEFS_H__
+#define __CVMX_SRIOMAINTX_DEFS_H__
+
+static inline u64 CVMX_SRIOMAINTX_PORT_0_CTL2(unsigned long offset)
+{
+	switch (cvmx_get_octeon_family()) {
+	case OCTEON_CNF75XX & OCTEON_FAMILY_MASK:
+		return 0x0000010000000154ull + (offset) * 0x100000000ull;
+	case OCTEON_CN66XX & OCTEON_FAMILY_MASK:
+		return 0x0000000000000154ull;
+	case OCTEON_CN63XX & OCTEON_FAMILY_MASK:
+		return 0x0000000000000154ull + (offset) * 0x100000000ull;
+	}
+	return 0x0000010000000154ull + (offset) * 0x100000000ull;
+}
+
+/**
+ * cvmx_sriomaint#_port_0_ctl2
+ *
+ * These registers are accessed when a local processor or an external
+ * device wishes to examine the port baudrate information.  The automatic
+ * baud rate feature is not available on this device. The SUP_* and ENB_*
+ * fields are set directly by the SRIO()_STATUS_REG[SPD] bits as a
+ * reference but otherwise have no effect.
+ *
+ * WARNING!!  Writes to this register will reinitialize the SRIO link.
+ */
+union cvmx_sriomaintx_port_0_ctl2 {
+	u32 u32;
+	struct cvmx_sriomaintx_port_0_ctl2_s {
+		u32 sel_baud : 4;
+		u32 baud_sup : 1;
+		u32 baud_enb : 1;
+		u32 sup_125g : 1;
+		u32 enb_125g : 1;
+		u32 sup_250g : 1;
+		u32 enb_250g : 1;
+		u32 sup_312g : 1;
+		u32 enb_312g : 1;
+		u32 sub_500g : 1;
+		u32 enb_500g : 1;
+		u32 sup_625g : 1;
+		u32 enb_625g : 1;
+		u32 reserved_2_15 : 14;
+		u32 tx_emph : 1;
+		u32 emph_en : 1;
+	} s;
+	struct cvmx_sriomaintx_port_0_ctl2_s cn63xx;
+	struct cvmx_sriomaintx_port_0_ctl2_s cn63xxp1;
+	struct cvmx_sriomaintx_port_0_ctl2_s cn66xx;
+	struct cvmx_sriomaintx_port_0_ctl2_s cnf75xx;
+};
+
+typedef union cvmx_sriomaintx_port_0_ctl2 cvmx_sriomaintx_port_0_ctl2_t;
+
+#endif