diff --git a/arch/mips/mach-octeon/cvmx-helper-rgmii.c b/arch/mips/mach-octeon/cvmx-helper-rgmii.c
new file mode 100644
index 0000000..dc19c3b
--- /dev/null
+++ b/arch/mips/mach-octeon/cvmx-helper-rgmii.c
@@ -0,0 +1,398 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018-2022 Marvell International Ltd.
+ *
+ * Functions for RGMII/GMII/MII initialization, configuration,
+ * and monitoring.
+ */
+
+#include <log.h>
+#include <time.h>
+#include <linux/delay.h>
+
+#include <mach/cvmx-regs.h>
+#include <mach/cvmx-csr.h>
+#include <mach/cvmx-bootmem.h>
+#include <mach/octeon-model.h>
+#include <mach/cvmx-fuse.h>
+#include <mach/octeon-feature.h>
+#include <mach/cvmx-qlm.h>
+#include <mach/octeon_qlm.h>
+#include <mach/cvmx-pcie.h>
+#include <mach/cvmx-coremask.h>
+#include <mach/cvmx-helper.h>
+#include <mach/cvmx-helper-board.h>
+
+#include <mach/cvmx-hwpko.h>
+
+#include <mach/cvmx-asxx-defs.h>
+#include <mach/cvmx-dbg-defs.h>
+#include <mach/cvmx-gmxx-defs.h>
+#include <mach/cvmx-npi-defs.h>
+#include <mach/cvmx-pko-defs.h>
+
+/**
+ * @INTERNAL
+ * Probe RGMII ports and determine the number present
+ *
+ * @param xiface Interface to probe
+ *
+ * @return Number of RGMII/GMII/MII ports (0-4).
+ */
+int __cvmx_helper_rgmii_probe(int xiface)
+{
+	struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+	int num_ports = 0;
+	union cvmx_gmxx_inf_mode mode;
+
+	mode.u64 = csr_rd(CVMX_GMXX_INF_MODE(xi.interface));
+
+	if (mode.s.type)
+		debug("ERROR: Unsupported Octeon model in %s\n", __func__);
+	else
+		debug("ERROR: Unsupported Octeon model in %s\n", __func__);
+	return num_ports;
+}
+
+/**
+ * @INTERNAL
+ * Configure all of the ASX, GMX, and PKO regsiters required
+ * to get RGMII to function on the supplied interface.
+ *
+ * @param xiface PKO Interface to configure (0 or 1)
+ *
+ * @return Zero on success
+ */
+int __cvmx_helper_rgmii_enable(int xiface)
+{
+	struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+	int interface = xi.interface;
+	int num_ports = cvmx_helper_ports_on_interface(interface);
+	int port;
+	union cvmx_gmxx_inf_mode mode;
+	union cvmx_asxx_tx_prt_en asx_tx;
+	union cvmx_asxx_rx_prt_en asx_rx;
+
+	mode.u64 = csr_rd(CVMX_GMXX_INF_MODE(interface));
+
+	if (num_ports == -1)
+		return -1;
+	if (mode.s.en == 0)
+		return -1;
+
+	/* Configure the ASX registers needed to use the RGMII ports */
+	asx_tx.u64 = 0;
+	asx_tx.s.prt_en = cvmx_build_mask(num_ports);
+	csr_wr(CVMX_ASXX_TX_PRT_EN(interface), asx_tx.u64);
+
+	asx_rx.u64 = 0;
+	asx_rx.s.prt_en = cvmx_build_mask(num_ports);
+	csr_wr(CVMX_ASXX_RX_PRT_EN(interface), asx_rx.u64);
+
+	/* Configure the GMX registers needed to use the RGMII ports */
+	for (port = 0; port < num_ports; port++) {
+		/*
+		 * Configure more flexible RGMII preamble
+		 * checking. Pass 1 doesn't support this feature.
+		 */
+		union cvmx_gmxx_rxx_frm_ctl frm_ctl;
+
+		frm_ctl.u64 = csr_rd(CVMX_GMXX_RXX_FRM_CTL(port, interface));
+		/* New field, so must be compile time */
+		frm_ctl.s.pre_free = 1;
+		csr_wr(CVMX_GMXX_RXX_FRM_CTL(port, interface), frm_ctl.u64);
+
+		/*
+		 * Each pause frame transmitted will ask for about 10M
+		 * bit times before resume.  If buffer space comes
+		 * available before that time has expired, an XON
+		 * pause frame (0 time) will be transmitted to restart
+		 * the flow.
+		 */
+		csr_wr(CVMX_GMXX_TXX_PAUSE_PKT_TIME(port, interface), 20000);
+		csr_wr(CVMX_GMXX_TXX_PAUSE_PKT_INTERVAL(port, interface),
+		       19000);
+
+		csr_wr(CVMX_ASXX_TX_CLK_SETX(port, interface), 24);
+		csr_wr(CVMX_ASXX_RX_CLK_SETX(port, interface), 24);
+	}
+
+	__cvmx_helper_setup_gmx(interface, num_ports);
+
+	/* enable the ports now */
+	for (port = 0; port < num_ports; port++) {
+		union cvmx_gmxx_prtx_cfg gmx_cfg;
+
+		cvmx_helper_link_autoconf(
+			cvmx_helper_get_ipd_port(interface, port));
+		gmx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(port, interface));
+		gmx_cfg.s.en = 1;
+		csr_wr(CVMX_GMXX_PRTX_CFG(port, interface), gmx_cfg.u64);
+	}
+	return 0;
+}
+
+/**
+ * @INTERNAL
+ * Return the link state of an IPD/PKO port as returned by
+ * auto negotiation. The result of this function may not match
+ * Octeon's link config if auto negotiation has changed since
+ * the last call to cvmx_helper_link_set().
+ *
+ * @param ipd_port IPD/PKO port to query
+ *
+ * @return Link state
+ */
+cvmx_helper_link_info_t __cvmx_helper_rgmii_link_get(int ipd_port)
+{
+	int interface = cvmx_helper_get_interface_num(ipd_port);
+	int index = cvmx_helper_get_interface_index_num(ipd_port);
+	union cvmx_asxx_prt_loop asxx_prt_loop;
+
+	asxx_prt_loop.u64 = csr_rd(CVMX_ASXX_PRT_LOOP(interface));
+	if (asxx_prt_loop.s.int_loop & (1 << index)) {
+		/* Force 1Gbps full duplex on internal loopback */
+		cvmx_helper_link_info_t result;
+
+		result.u64 = 0;
+		result.s.full_duplex = 1;
+		result.s.link_up = 1;
+		result.s.speed = 1000;
+		return result;
+	} else {
+		return __cvmx_helper_board_link_get(ipd_port);
+	}
+}
+
+/**
+ * @INTERNAL
+ * Return the link state of an IPD/PKO port as returned by
+ * auto negotiation. The result of this function may not match
+ * Octeon's link config if auto negotiation has changed since
+ * the last call to cvmx_helper_link_set().
+ *
+ * @param ipd_port IPD/PKO port to query
+ *
+ * @return Link state
+ */
+cvmx_helper_link_info_t __cvmx_helper_gmii_link_get(int ipd_port)
+{
+	cvmx_helper_link_info_t result;
+	int index = cvmx_helper_get_interface_index_num(ipd_port);
+
+	if (index == 0) {
+		result = __cvmx_helper_rgmii_link_get(ipd_port);
+	} else {
+		result.s.full_duplex = 1;
+		result.s.link_up = 1;
+		result.s.speed = 1000;
+	}
+
+	return result;
+}
+
+/**
+ * @INTERNAL
+ * Configure an IPD/PKO port for the specified link state. This
+ * function does not influence auto negotiation at the PHY level.
+ * The passed link state must always match the link state returned
+ * by cvmx_helper_link_get(). It is normally best to use
+ * cvmx_helper_link_autoconf() instead.
+ *
+ * @param ipd_port  IPD/PKO port to configure
+ * @param link_info The new link state
+ *
+ * @return Zero on success, negative on failure
+ */
+int __cvmx_helper_rgmii_link_set(int ipd_port,
+				 cvmx_helper_link_info_t link_info)
+{
+	int result = 0;
+	int interface = cvmx_helper_get_interface_num(ipd_port);
+	int index = cvmx_helper_get_interface_index_num(ipd_port);
+	union cvmx_gmxx_prtx_cfg original_gmx_cfg;
+	union cvmx_gmxx_prtx_cfg new_gmx_cfg;
+	union cvmx_pko_mem_queue_qos pko_mem_queue_qos;
+	union cvmx_pko_mem_queue_qos pko_mem_queue_qos_save[16];
+	union cvmx_gmxx_tx_ovr_bp gmx_tx_ovr_bp;
+	union cvmx_gmxx_tx_ovr_bp gmx_tx_ovr_bp_save;
+	int i;
+
+	/* Read the current settings so we know the current enable state */
+	original_gmx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+	new_gmx_cfg = original_gmx_cfg;
+
+	/* Disable the lowest level RX */
+	csr_wr(CVMX_ASXX_RX_PRT_EN(interface),
+	       csr_rd(CVMX_ASXX_RX_PRT_EN(interface)) & ~(1 << index));
+
+	memset(pko_mem_queue_qos_save, 0, sizeof(pko_mem_queue_qos_save));
+	/* Disable all queues so that TX should become idle */
+	for (i = 0; i < cvmx_pko_get_num_queues(ipd_port); i++) {
+		int queue = cvmx_pko_get_base_queue(ipd_port) + i;
+
+		csr_wr(CVMX_PKO_REG_READ_IDX, queue);
+		pko_mem_queue_qos.u64 = csr_rd(CVMX_PKO_MEM_QUEUE_QOS);
+		pko_mem_queue_qos.s.pid = ipd_port;
+		pko_mem_queue_qos.s.qid = queue;
+		pko_mem_queue_qos_save[i] = pko_mem_queue_qos;
+		pko_mem_queue_qos.s.qos_mask = 0;
+		csr_wr(CVMX_PKO_MEM_QUEUE_QOS, pko_mem_queue_qos.u64);
+	}
+
+	/* Disable backpressure */
+	gmx_tx_ovr_bp.u64 = csr_rd(CVMX_GMXX_TX_OVR_BP(interface));
+	gmx_tx_ovr_bp_save = gmx_tx_ovr_bp;
+	gmx_tx_ovr_bp.s.bp &= ~(1 << index);
+	gmx_tx_ovr_bp.s.en |= 1 << index;
+	csr_wr(CVMX_GMXX_TX_OVR_BP(interface), gmx_tx_ovr_bp.u64);
+	csr_rd(CVMX_GMXX_TX_OVR_BP(interface));
+
+	/*
+	 * Poll the GMX state machine waiting for it to become
+	 * idle. Preferably we should only change speed when it is
+	 * idle. If it doesn't become idle we will still do the speed
+	 * change, but there is a slight chance that GMX will
+	 * lockup.
+	 */
+	csr_wr(CVMX_NPI_DBG_SELECT, interface * 0x800 + index * 0x100 + 0x880);
+	CVMX_WAIT_FOR_FIELD64(CVMX_DBG_DATA, cvmx_dbg_data_t, data & 7, ==, 0,
+			      10000);
+	CVMX_WAIT_FOR_FIELD64(CVMX_DBG_DATA, cvmx_dbg_data_t, data & 0xf, ==, 0,
+			      10000);
+
+	/* Disable the port before we make any changes */
+	new_gmx_cfg.s.en = 0;
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
+	csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+
+	/* Set full/half duplex */
+	if (!link_info.s.link_up)
+		/* Force full duplex on down links */
+		new_gmx_cfg.s.duplex = 1;
+	else
+		new_gmx_cfg.s.duplex = link_info.s.full_duplex;
+
+	/* Set the link speed. Anything unknown is set to 1Gbps */
+	if (link_info.s.speed == 10) {
+		new_gmx_cfg.s.slottime = 0;
+		new_gmx_cfg.s.speed = 0;
+	} else if (link_info.s.speed == 100) {
+		new_gmx_cfg.s.slottime = 0;
+		new_gmx_cfg.s.speed = 0;
+	} else {
+		new_gmx_cfg.s.slottime = 1;
+		new_gmx_cfg.s.speed = 1;
+	}
+
+	/* Adjust the clocks */
+	if (link_info.s.speed == 10) {
+		csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 50);
+		csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x40);
+		csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0);
+	} else if (link_info.s.speed == 100) {
+		csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 5);
+		csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x40);
+		csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0);
+	} else {
+		csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 1);
+		csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x200);
+		csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0x2000);
+	}
+
+	/* Do a read to make sure all setup stuff is complete */
+	csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+
+	/* Save the new GMX setting without enabling the port */
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
+
+	/* Enable the lowest level RX */
+	if (link_info.s.link_up)
+		csr_wr(CVMX_ASXX_RX_PRT_EN(interface),
+		       csr_rd(CVMX_ASXX_RX_PRT_EN(interface)) | (1 << index));
+
+	/* Re-enable the TX path */
+	for (i = 0; i < cvmx_pko_get_num_queues(ipd_port); i++) {
+		int queue = cvmx_pko_get_base_queue(ipd_port) + i;
+
+		csr_wr(CVMX_PKO_REG_READ_IDX, queue);
+		csr_wr(CVMX_PKO_MEM_QUEUE_QOS, pko_mem_queue_qos_save[i].u64);
+	}
+
+	/* Restore backpressure */
+	csr_wr(CVMX_GMXX_TX_OVR_BP(interface), gmx_tx_ovr_bp_save.u64);
+
+	/* Restore the GMX enable state. Port config is complete */
+	new_gmx_cfg.s.en = original_gmx_cfg.s.en;
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), new_gmx_cfg.u64);
+
+	return result;
+}
+
+/**
+ * @INTERNAL
+ * Configure a port for internal and/or external loopback. Internal loopback
+ * causes packets sent by the port to be received by Octeon. External loopback
+ * causes packets received from the wire to sent out again.
+ *
+ * @param ipd_port IPD/PKO port to loopback.
+ * @param enable_internal
+ *                 Non zero if you want internal loopback
+ * @param enable_external
+ *                 Non zero if you want external loopback
+ *
+ * @return Zero on success, negative on failure.
+ */
+int __cvmx_helper_rgmii_configure_loopback(int ipd_port, int enable_internal,
+					   int enable_external)
+{
+	int interface = cvmx_helper_get_interface_num(ipd_port);
+	int index = cvmx_helper_get_interface_index_num(ipd_port);
+	int original_enable;
+	union cvmx_gmxx_prtx_cfg gmx_cfg;
+	union cvmx_asxx_prt_loop asxx_prt_loop;
+
+	/* Read the current enable state and save it */
+	gmx_cfg.u64 = csr_rd(CVMX_GMXX_PRTX_CFG(index, interface));
+	original_enable = gmx_cfg.s.en;
+	/* Force port to be disabled */
+	gmx_cfg.s.en = 0;
+	if (enable_internal) {
+		/* Force speed if we're doing internal loopback */
+		gmx_cfg.s.duplex = 1;
+		gmx_cfg.s.slottime = 1;
+		gmx_cfg.s.speed = 1;
+		csr_wr(CVMX_GMXX_TXX_CLK(index, interface), 1);
+		csr_wr(CVMX_GMXX_TXX_SLOT(index, interface), 0x200);
+		csr_wr(CVMX_GMXX_TXX_BURST(index, interface), 0x2000);
+	}
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
+
+	/* Set the loopback bits */
+	asxx_prt_loop.u64 = csr_rd(CVMX_ASXX_PRT_LOOP(interface));
+	if (enable_internal)
+		asxx_prt_loop.s.int_loop |= 1 << index;
+	else
+		asxx_prt_loop.s.int_loop &= ~(1 << index);
+	if (enable_external)
+		asxx_prt_loop.s.ext_loop |= 1 << index;
+	else
+		asxx_prt_loop.s.ext_loop &= ~(1 << index);
+	csr_wr(CVMX_ASXX_PRT_LOOP(interface), asxx_prt_loop.u64);
+
+	/* Force enables in internal loopback */
+	if (enable_internal) {
+		u64 tmp;
+
+		tmp = csr_rd(CVMX_ASXX_TX_PRT_EN(interface));
+		csr_wr(CVMX_ASXX_TX_PRT_EN(interface), (1 << index) | tmp);
+		tmp = csr_rd(CVMX_ASXX_RX_PRT_EN(interface));
+		csr_wr(CVMX_ASXX_RX_PRT_EN(interface), (1 << index) | tmp);
+		original_enable = 1;
+	}
+
+	/* Restore the enable state */
+	gmx_cfg.s.en = original_enable;
+	csr_wr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
+	return 0;
+}