openwrt/target/linux/generic/pending-6.1/737-net-ethernet-mtk_eth_soc-add-paths-and-SerDes-modes-.patch

From 1e25ca1147579bda8b941be1b9851f5911d44eb0 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Tue, 22 Aug 2023 19:04:42 +0100
Subject: [PATCH 098/125] net: ethernet: mtk_eth_soc: add paths and SerDes
 modes for MT7988

MT7988 comes with a built-in 2.5G PHY as well as SerDes lanes to
connect external PHYs or transceivers in USXGMII, 10GBase-R, 5GBase-R,
2500Base-X, 1000Base-X and Cisco SGMII interface modes.

Implement support for configuring for the new paths to SerDes interfaces
and the internal 2.5G PHY.

Add USXGMII PCS driver for 10GBase-R, 5GBase-R and USXGMII mode, and
setup the new PHYA on MT7988 to access the also still existing old
LynxI PCS for 1000Base-X, 2500Base-X and Cisco SGMII PCS interface
modes.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/net/ethernet/mediatek/Kconfig        |  16 +
 drivers/net/ethernet/mediatek/Makefile       |   1 +
 drivers/net/ethernet/mediatek/mtk_eth_path.c | 123 +++-
 drivers/net/ethernet/mediatek/mtk_eth_soc.c  | 182 ++++-
 drivers/net/ethernet/mediatek/mtk_eth_soc.h  | 232 ++++++-
 drivers/net/ethernet/mediatek/mtk_usxgmii.c  | 692 +++++++++++++++++++
 6 files changed, 1215 insertions(+), 31 deletions(-)
 create mode 100644 drivers/net/ethernet/mediatek/mtk_usxgmii.c

--- a/drivers/net/ethernet/mediatek/Kconfig
+++ b/drivers/net/ethernet/mediatek/Kconfig
@@ -25,6 +25,22 @@ config NET_MEDIATEK_SOC
 	  This driver supports the gigabit ethernet MACs in the
 	  MediaTek SoC family.
 
+config NET_MEDIATEK_SOC_USXGMII
+	bool "Support USXGMII SerDes on MT7988"
+	depends on (ARCH_MEDIATEK && ARM64) || COMPILE_TEST
+	def_bool NET_MEDIATEK_SOC != n
+	help
+	  Include support for 10GE SerDes which can be found on MT7988.
+	  If this kernel should run on SoCs with 10 GBit/s Ethernet you
+	  will need to select this option to use GMAC2 and GMAC3 with
+	  external PHYs, SFP(+) cages in 10GBase-R, 5GBase-R or USXGMII
+	  interface modes.
+
+	  Note that as the 2500Base-X/1000Base-X/Cisco SGMII SerDes PCS
+	  unit (MediaTek LynxI) in MT7988 is connected via the new 10GE
+	  SerDes, you will also need to select this option in case you
+	  want to use any of those SerDes modes.
+
 config NET_MEDIATEK_STAR_EMAC
 	tristate "MediaTek STAR Ethernet MAC support"
 	select PHYLIB
--- a/drivers/net/ethernet/mediatek/Makefile
+++ b/drivers/net/ethernet/mediatek/Makefile
@@ -5,6 +5,7 @@
 
 obj-$(CONFIG_NET_MEDIATEK_SOC) += mtk_eth.o
 mtk_eth-y := mtk_eth_soc.o mtk_eth_path.o mtk_ppe.o mtk_ppe_debugfs.o mtk_ppe_offload.o
+mtk_eth-$(CONFIG_NET_MEDIATEK_SOC_USXGMII) += mtk_usxgmii.o
 mtk_eth-$(CONFIG_NET_MEDIATEK_SOC_WED) += mtk_wed.o mtk_wed_mcu.o mtk_wed_wo.o
 ifdef CONFIG_DEBUG_FS
 mtk_eth-$(CONFIG_NET_MEDIATEK_SOC_WED) += mtk_wed_debugfs.o
--- a/drivers/net/ethernet/mediatek/mtk_eth_path.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_path.c
@@ -31,10 +31,20 @@ static const char *mtk_eth_path_name(u64
 		return "gmac2_rgmii";
 	case MTK_ETH_PATH_GMAC2_SGMII:
 		return "gmac2_sgmii";
+	case MTK_ETH_PATH_GMAC2_2P5GPHY:
+		return "gmac2_2p5gphy";
 	case MTK_ETH_PATH_GMAC2_GEPHY:
 		return "gmac2_gephy";
+	case MTK_ETH_PATH_GMAC3_SGMII:
+		return "gmac3_sgmii";
 	case MTK_ETH_PATH_GDM1_ESW:
 		return "gdm1_esw";
+	case MTK_ETH_PATH_GMAC1_USXGMII:
+		return "gmac1_usxgmii";
+	case MTK_ETH_PATH_GMAC2_USXGMII:
+		return "gmac2_usxgmii";
+	case MTK_ETH_PATH_GMAC3_USXGMII:
+		return "gmac3_usxgmii";
 	default:
 		return "unknown path";
 	}
@@ -127,6 +137,27 @@ static int set_mux_u3_gmac2_to_qphy(stru
 	return 0;
 }
 
+static int set_mux_gmac2_to_2p5gphy(struct mtk_eth *eth, u64 path)
+{
+	int ret;
+
+	if (path == MTK_ETH_PATH_GMAC2_2P5GPHY) {
+		ret = regmap_clear_bits(eth->ethsys, ETHSYS_SYSCFG0, SYSCFG0_SGMII_GMAC2_V2);
+		if (ret)
+			return ret;
+
+		/* Setup mux to 2p5g PHY */
+		ret = regmap_clear_bits(eth->infra, TOP_MISC_NETSYS_PCS_MUX, MUX_G2_USXGMII_SEL);
+		if (ret)
+			return ret;
+
+		dev_dbg(eth->dev, "path %s in %s updated\n",
+			mtk_eth_path_name(path), __func__);
+	}
+
+	return 0;
+}
+
 static int set_mux_gmac1_gmac2_to_sgmii_rgmii(struct mtk_eth *eth, u64 path)
 {
 	unsigned int val = 0;
@@ -165,7 +196,48 @@ static int set_mux_gmac1_gmac2_to_sgmii_
 	return 0;
 }
 
-static int set_mux_gmac12_to_gephy_sgmii(struct mtk_eth *eth, u64 path)
+static int set_mux_gmac123_to_usxgmii(struct mtk_eth *eth, u64 path)
+{
+	unsigned int val = 0;
+	bool updated = true;
+	int mac_id = 0;
+
+	/* Disable SYSCFG1 SGMII */
+	regmap_read(eth->ethsys, ETHSYS_SYSCFG0, &val);
+
+	switch (path) {
+	case MTK_ETH_PATH_GMAC1_USXGMII:
+		val &= ~(u32)SYSCFG0_SGMII_GMAC1_V2;
+		mac_id = MTK_GMAC1_ID;
+		break;
+	case MTK_ETH_PATH_GMAC2_USXGMII:
+		val &= ~(u32)SYSCFG0_SGMII_GMAC2_V2;
+		mac_id = MTK_GMAC2_ID;
+		break;
+	case MTK_ETH_PATH_GMAC3_USXGMII:
+		val &= ~(u32)SYSCFG0_SGMII_GMAC3_V2;
+		mac_id = MTK_GMAC3_ID;
+		break;
+	default:
+		updated = false;
+	};
+
+	if (updated) {
+		regmap_update_bits(eth->ethsys, ETHSYS_SYSCFG0,
+				   SYSCFG0_SGMII_MASK, val);
+
+		if (mac_id == MTK_GMAC2_ID)
+			regmap_set_bits(eth->infra, TOP_MISC_NETSYS_PCS_MUX,
+					MUX_G2_USXGMII_SEL);
+	}
+
+	dev_dbg(eth->dev, "path %s in %s updated = %d\n",
+		mtk_eth_path_name(path), __func__, updated);
+
+	return 0;
+}
+
+static int set_mux_gmac123_to_gephy_sgmii(struct mtk_eth *eth, u64 path)
 {
 	unsigned int val = 0;
 	bool updated = true;
@@ -182,6 +254,9 @@ static int set_mux_gmac12_to_gephy_sgmii
 	case MTK_ETH_PATH_GMAC2_SGMII:
 		val |= SYSCFG0_SGMII_GMAC2_V2;
 		break;
+	case MTK_ETH_PATH_GMAC3_SGMII:
+		val |= SYSCFG0_SGMII_GMAC3_V2;
+		break;
 	default:
 		updated = false;
 	}
@@ -210,13 +285,25 @@ static const struct mtk_eth_muxc mtk_eth
 		.cap_bit = MTK_ETH_MUX_U3_GMAC2_TO_QPHY,
 		.set_path = set_mux_u3_gmac2_to_qphy,
 	}, {
+		.name = "mux_gmac2_to_2p5gphy",
+		.cap_bit = MTK_ETH_MUX_GMAC2_TO_2P5GPHY,
+		.set_path = set_mux_gmac2_to_2p5gphy,
+	}, {
 		.name = "mux_gmac1_gmac2_to_sgmii_rgmii",
 		.cap_bit = MTK_ETH_MUX_GMAC1_GMAC2_TO_SGMII_RGMII,
 		.set_path = set_mux_gmac1_gmac2_to_sgmii_rgmii,
 	}, {
 		.name = "mux_gmac12_to_gephy_sgmii",
 		.cap_bit = MTK_ETH_MUX_GMAC12_TO_GEPHY_SGMII,
-		.set_path = set_mux_gmac12_to_gephy_sgmii,
+		.set_path = set_mux_gmac123_to_gephy_sgmii,
+	}, {
+		.name = "mux_gmac123_to_gephy_sgmii",
+		.cap_bit = MTK_ETH_MUX_GMAC123_TO_GEPHY_SGMII,
+		.set_path = set_mux_gmac123_to_gephy_sgmii,
+	}, {
+		.name = "mux_gmac123_to_usxgmii",
+		.cap_bit = MTK_ETH_MUX_GMAC123_TO_USXGMII,
+		.set_path = set_mux_gmac123_to_usxgmii,
 	},
 };
 
@@ -249,12 +336,39 @@ out:
 	return err;
 }
 
+int mtk_gmac_usxgmii_path_setup(struct mtk_eth *eth, int mac_id)
+{
+	u64 path;
+
+	path = (mac_id == MTK_GMAC1_ID) ?  MTK_ETH_PATH_GMAC1_USXGMII :
+	       (mac_id == MTK_GMAC2_ID) ?  MTK_ETH_PATH_GMAC2_USXGMII :
+					   MTK_ETH_PATH_GMAC3_USXGMII;
+
+	/* Setup proper MUXes along the path */
+	return mtk_eth_mux_setup(eth, path);
+}
+
 int mtk_gmac_sgmii_path_setup(struct mtk_eth *eth, int mac_id)
 {
 	u64 path;
 
-	path = (mac_id == 0) ?  MTK_ETH_PATH_GMAC1_SGMII :
-				MTK_ETH_PATH_GMAC2_SGMII;
+	path = (mac_id == MTK_GMAC1_ID) ? MTK_ETH_PATH_GMAC1_SGMII :
+	       (mac_id == MTK_GMAC2_ID) ? MTK_ETH_PATH_GMAC2_SGMII :
+					  MTK_ETH_PATH_GMAC3_SGMII;
+
+	/* Setup proper MUXes along the path */
+	return mtk_eth_mux_setup(eth, path);
+}
+
+int mtk_gmac_2p5gphy_path_setup(struct mtk_eth *eth, int mac_id)
+{
+	u64 path = 0;
+
+	if (mac_id == MTK_GMAC2_ID)
+		path = MTK_ETH_PATH_GMAC2_2P5GPHY;
+
+	if (!path)
+		return -EINVAL;
 
 	/* Setup proper MUXes along the path */
 	return mtk_eth_mux_setup(eth, path);
@@ -284,4 +398,3 @@ int mtk_gmac_rgmii_path_setup(struct mtk
 	/* Setup proper MUXes along the path */
 	return mtk_eth_mux_setup(eth, path);
 }
-
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -474,6 +474,30 @@ static void mtk_setup_bridge_switch(stru
 		MTK_GSW_CFG);
 }
 
+static bool mtk_check_gmac23_idle(struct mtk_mac *mac)
+{
+	u32 mac_fsm, gdm_fsm;
+
+	mac_fsm = mtk_r32(mac->hw, MTK_MAC_FSM(mac->id));
+
+	switch (mac->id) {
+	case MTK_GMAC2_ID:
+		gdm_fsm = mtk_r32(mac->hw, MTK_FE_GDM2_FSM);
+		break;
+	case MTK_GMAC3_ID:
+		gdm_fsm = mtk_r32(mac->hw, MTK_FE_GDM3_FSM);
+		break;
+	default:
+		return true;
+	};
+
+	if ((mac_fsm & 0xFFFF0000) == 0x01010000 &&
+	    (gdm_fsm & 0xFFFF0000) == 0x00000000)
+		return true;
+
+	return false;
+}
+
 static struct phylink_pcs *mtk_mac_select_pcs(struct phylink_config *config,
 					      phy_interface_t interface)
 {
@@ -482,12 +506,20 @@ static struct phylink_pcs *mtk_mac_selec
 	struct mtk_eth *eth = mac->hw;
 	unsigned int sid;
 
-	if (interface == PHY_INTERFACE_MODE_SGMII ||
-	    phy_interface_mode_is_8023z(interface)) {
-		sid = (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_SGMII)) ?
-		       0 : mac->id;
-
-		return eth->sgmii_pcs[sid];
+	if ((interface == PHY_INTERFACE_MODE_SGMII ||
+	     phy_interface_mode_is_8023z(interface)) &&
+	    MTK_HAS_CAPS(eth->soc->caps, MTK_SGMII)) {
+		sid = mtk_mac2xgmii_id(eth, mac->id);
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_USXGMII))
+			return mtk_sgmii_wrapper_select_pcs(eth, mac->id);
+		else
+			return eth->sgmii_pcs[sid];
+	} else if ((interface == PHY_INTERFACE_MODE_USXGMII ||
+		    interface == PHY_INTERFACE_MODE_10GBASER ||
+		    interface == PHY_INTERFACE_MODE_5GBASER) &&
+		   MTK_HAS_CAPS(eth->soc->caps, MTK_USXGMII) &&
+		   mac->id != MTK_GMAC1_ID) {
+		return mtk_usxgmii_select_pcs(eth, mac->id);
 	}
 
 	return NULL;
@@ -543,7 +575,22 @@ static void mtk_mac_config(struct phylin
 					goto init_err;
 			}
 			break;
+		case PHY_INTERFACE_MODE_USXGMII:
+		case PHY_INTERFACE_MODE_10GBASER:
+		case PHY_INTERFACE_MODE_5GBASER:
+			if (MTK_HAS_CAPS(eth->soc->caps, MTK_USXGMII)) {
+				err = mtk_gmac_usxgmii_path_setup(eth, mac->id);
+				if (err)
+					goto init_err;
+			}
+			break;
 		case PHY_INTERFACE_MODE_INTERNAL:
+			if (mac->id == MTK_GMAC2_ID &&
+			    MTK_HAS_CAPS(eth->soc->caps, MTK_2P5GPHY)) {
+				err = mtk_gmac_2p5gphy_path_setup(eth, mac->id);
+				if (err)
+					goto init_err;
+			}
 			break;
 		default:
 			goto err_phy;
@@ -598,8 +645,6 @@ static void mtk_mac_config(struct phylin
 		val &= ~SYSCFG0_GE_MODE(SYSCFG0_GE_MASK, mac->id);
 		val |= SYSCFG0_GE_MODE(ge_mode, mac->id);
 		regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
-
-		mac->interface = state->interface;
 	}
 
 	/* SGMII */
@@ -616,21 +661,40 @@ static void mtk_mac_config(struct phylin
 
 		/* Save the syscfg0 value for mac_finish */
 		mac->syscfg0 = val;
-	} else if (phylink_autoneg_inband(mode)) {
+	} else if (state->interface != PHY_INTERFACE_MODE_USXGMII &&
+		   state->interface != PHY_INTERFACE_MODE_10GBASER &&
+		   state->interface != PHY_INTERFACE_MODE_5GBASER &&
+		   phylink_autoneg_inband(mode)) {
 		dev_err(eth->dev,
-			"In-band mode not supported in non SGMII mode!\n");
+			"In-band mode not supported in non-SerDes modes!\n");
 		return;
 	}
 
 	/* Setup gmac */
-	if (mtk_is_netsys_v3_or_greater(eth) &&
-	    mac->interface == PHY_INTERFACE_MODE_INTERNAL) {
-		mtk_w32(mac->hw, MTK_GDMA_XGDM_SEL, MTK_GDMA_EG_CTRL(mac->id));
-		mtk_w32(mac->hw, MAC_MCR_FORCE_LINK_DOWN, MTK_MAC_MCR(mac->id));
+	if (mtk_is_netsys_v3_or_greater(eth)) {
+		if (mtk_interface_mode_is_xgmii(state->interface)) {
+			mtk_w32(mac->hw, MTK_GDMA_XGDM_SEL, MTK_GDMA_EG_CTRL(mac->id));
+			mtk_w32(mac->hw, MAC_MCR_FORCE_LINK_DOWN, MTK_MAC_MCR(mac->id));
+
+			if (mac->id == MTK_GMAC1_ID)
+				mtk_setup_bridge_switch(eth);
+		} else {
+			mtk_w32(eth, 0, MTK_GDMA_EG_CTRL(mac->id));
 
-		mtk_setup_bridge_switch(eth);
+			/* FIXME: In current hardware design, we have to reset FE
+			 * when swtiching XGDM to GDM. Therefore, here trigger an SER
+			 * to let GDM go back to the initial state.
+			 */
+			if ((mtk_interface_mode_is_xgmii(mac->interface) ||
+			     mac->interface == PHY_INTERFACE_MODE_NA) &&
+			    !mtk_check_gmac23_idle(mac) &&
+			    !test_bit(MTK_RESETTING, &eth->state))
+				schedule_work(&eth->pending_work);
+		}
 	}
 
+	mac->interface = state->interface;
+
 	return;
 
 err_phy:
@@ -676,10 +740,13 @@ static void mtk_mac_link_down(struct phy
 {
 	struct mtk_mac *mac = container_of(config, struct mtk_mac,
 					   phylink_config);
-	u32 mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
 
-	mcr &= ~(MAC_MCR_TX_EN | MAC_MCR_RX_EN);
-	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
+	if (!mtk_interface_mode_is_xgmii(interface)) {
+		mtk_m32(mac->hw, MAC_MCR_TX_EN | MAC_MCR_RX_EN, 0, MTK_MAC_MCR(mac->id));
+		mtk_m32(mac->hw, MTK_XGMAC_FORCE_LINK(mac->id), 0, MTK_XGMAC_STS(mac->id));
+	} else if (mac->id != MTK_GMAC1_ID) {
+		mtk_m32(mac->hw, XMAC_MCR_TRX_DISABLE, XMAC_MCR_TRX_DISABLE, MTK_XMAC_MCR(mac->id));
+	}
 }
 
 static void mtk_set_queue_speed(struct mtk_eth *eth, unsigned int idx,
@@ -751,13 +818,11 @@ static void mtk_set_queue_speed(struct m
 	mtk_w32(eth, val, soc->reg_map->qdma.qtx_sch + ofs);
 }
 
-static void mtk_mac_link_up(struct phylink_config *config,
-			    struct phy_device *phy,
-			    unsigned int mode, phy_interface_t interface,
-			    int speed, int duplex, bool tx_pause, bool rx_pause)
+static void mtk_gdm_mac_link_up(struct mtk_mac *mac,
+				struct phy_device *phy,
+				unsigned int mode, phy_interface_t interface,
+				int speed, int duplex, bool tx_pause, bool rx_pause)
 {
-	struct mtk_mac *mac = container_of(config, struct mtk_mac,
-					   phylink_config);
 	u32 mcr;
 
 	mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
@@ -791,6 +856,55 @@ static void mtk_mac_link_up(struct phyli
 	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
 }
 
+static void mtk_xgdm_mac_link_up(struct mtk_mac *mac,
+				 struct phy_device *phy,
+				 unsigned int mode, phy_interface_t interface,
+				 int speed, int duplex, bool tx_pause, bool rx_pause)
+{
+	u32 mcr, force_link = 0;
+
+	if (mac->id == MTK_GMAC1_ID)
+		return;
+
+	/* Eliminate the interference(before link-up) caused by PHY noise */
+	mtk_m32(mac->hw, XMAC_LOGIC_RST, 0, MTK_XMAC_LOGIC_RST(mac->id));
+	mdelay(20);
+	mtk_m32(mac->hw, XMAC_GLB_CNTCLR, XMAC_GLB_CNTCLR, MTK_XMAC_CNT_CTRL(mac->id));
+
+	if (mac->interface == PHY_INTERFACE_MODE_INTERNAL || mac->id == MTK_GMAC3_ID)
+		force_link = MTK_XGMAC_FORCE_LINK(mac->id);
+
+	mtk_m32(mac->hw, MTK_XGMAC_FORCE_LINK(mac->id), force_link, MTK_XGMAC_STS(mac->id));
+
+	mcr = mtk_r32(mac->hw, MTK_XMAC_MCR(mac->id));
+	mcr &= ~(XMAC_MCR_FORCE_TX_FC | XMAC_MCR_FORCE_RX_FC | XMAC_MCR_TRX_DISABLE);
+	/* Configure pause modes -
+	 * phylink will avoid these for half duplex
+	 */
+	if (tx_pause)
+		mcr |= XMAC_MCR_FORCE_TX_FC;
+	if (rx_pause)
+		mcr |= XMAC_MCR_FORCE_RX_FC;
+
+	mtk_w32(mac->hw, mcr, MTK_XMAC_MCR(mac->id));
+}
+
+static void mtk_mac_link_up(struct phylink_config *config,
+			    struct phy_device *phy,
+			    unsigned int mode, phy_interface_t interface,
+			    int speed, int duplex, bool tx_pause, bool rx_pause)
+{
+	struct mtk_mac *mac = container_of(config, struct mtk_mac,
+					   phylink_config);
+
+	if (mtk_interface_mode_is_xgmii(interface))
+		mtk_xgdm_mac_link_up(mac, phy, mode, interface, speed, duplex,
+				     tx_pause, rx_pause);
+	else
+		mtk_gdm_mac_link_up(mac, phy, mode, interface, speed, duplex,
+				    tx_pause, rx_pause);
+}
+
 static const struct phylink_mac_ops mtk_phylink_ops = {
 	.validate = phylink_generic_validate,
 	.mac_select_pcs = mtk_mac_select_pcs,
@@ -4616,8 +4730,21 @@ static int mtk_add_mac(struct mtk_eth *e
 		phy_interface_zero(mac->phylink_config.supported_interfaces);
 		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
 			  mac->phylink_config.supported_interfaces);
+	} else if (MTK_HAS_CAPS(mac->hw->soc->caps, MTK_USXGMII)) {
+		mac->phylink_config.mac_capabilities |= MAC_5000FD | MAC_10000FD;
+		__set_bit(PHY_INTERFACE_MODE_5GBASER,
+			  mac->phylink_config.supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_10GBASER,
+			  mac->phylink_config.supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_USXGMII,
+			  mac->phylink_config.supported_interfaces);
 	}
 
+	if (MTK_HAS_CAPS(mac->hw->soc->caps, MTK_2P5GPHY) &&
+	    id == MTK_GMAC2_ID)
+		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
+			  mac->phylink_config.supported_interfaces);
+
 	phylink = phylink_create(&mac->phylink_config,
 				 of_fwnode_handle(mac->of_node),
 				 phy_mode, &mtk_phylink_ops);
@@ -4810,6 +4937,13 @@ static int mtk_probe(struct platform_dev
 
 		if (err)
 			return err;
+	}
+
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_USXGMII)) {
+		err = mtk_usxgmii_init(eth);
+
+		if (err)
+			return err;
 	}
 
 	if (eth->soc->required_pctl) {
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -502,6 +502,21 @@
 #define INTF_MODE_RGMII_1000    (TRGMII_MODE | TRGMII_CENTRAL_ALIGNED)
 #define INTF_MODE_RGMII_10_100  0
 
+/* XFI Mac control registers */
+#define MTK_XMAC_BASE(x)	(0x12000 + (((x) - 1) * 0x1000))
+#define MTK_XMAC_MCR(x)		(MTK_XMAC_BASE(x))
+#define XMAC_MCR_TRX_DISABLE	0xf
+#define XMAC_MCR_FORCE_TX_FC	BIT(5)
+#define XMAC_MCR_FORCE_RX_FC	BIT(4)
+
+/* XFI Mac logic reset registers */
+#define MTK_XMAC_LOGIC_RST(x)	(MTK_XMAC_BASE(x) + 0x10)
+#define XMAC_LOGIC_RST		BIT(0)
+
+/* XFI Mac count global control */
+#define MTK_XMAC_CNT_CTRL(x)	(MTK_XMAC_BASE(x) + 0x100)
+#define XMAC_GLB_CNTCLR		BIT(0)
+
 /* GPIO port control registers for GMAC 2*/
 #define GPIO_OD33_CTRL8		0x4c0
 #define GPIO_BIAS_CTRL		0xed0
@@ -527,6 +542,7 @@
 #define SYSCFG0_SGMII_GMAC2    ((3 << 8) & SYSCFG0_SGMII_MASK)
 #define SYSCFG0_SGMII_GMAC1_V2 BIT(9)
 #define SYSCFG0_SGMII_GMAC2_V2 BIT(8)
+#define SYSCFG0_SGMII_GMAC3_V2 BIT(7)
 
 
 /* ethernet subsystem clock register */
@@ -559,12 +575,74 @@
 #define ETHSYS_DMA_AG_MAP_QDMA	BIT(1)
 #define ETHSYS_DMA_AG_MAP_PPE	BIT(2)
 
+/* USXGMII subsystem config registers */
+/* Register to control speed */
+#define RG_PHY_TOP_SPEED_CTRL1	0x80C
+#define USXGMII_RATE_UPDATE_MODE	BIT(31)
+#define USXGMII_MAC_CK_GATED	BIT(29)
+#define USXGMII_IF_FORCE_EN	BIT(28)
+#define USXGMII_RATE_ADAPT_MODE	GENMASK(10, 8)
+#define USXGMII_RATE_ADAPT_MODE_X1	0
+#define USXGMII_RATE_ADAPT_MODE_X2	1
+#define USXGMII_RATE_ADAPT_MODE_X4	2
+#define USXGMII_RATE_ADAPT_MODE_X10	3
+#define USXGMII_RATE_ADAPT_MODE_X100	4
+#define USXGMII_RATE_ADAPT_MODE_X5	5
+#define USXGMII_RATE_ADAPT_MODE_X50	6
+#define USXGMII_XFI_RX_MODE	GENMASK(6, 4)
+#define USXGMII_XFI_RX_MODE_10G	0
+#define USXGMII_XFI_RX_MODE_5G	1
+#define USXGMII_XFI_TX_MODE	GENMASK(2, 0)
+#define USXGMII_XFI_TX_MODE_10G	0
+#define USXGMII_XFI_TX_MODE_5G	1
+
+/* Register to control PCS AN */
+#define RG_PCS_AN_CTRL0		0x810
+#define USXGMII_AN_RESTART	BIT(31)
+#define USXGMII_AN_SYNC_CNT	GENMASK(30, 11)
+#define USXGMII_AN_ENABLE	BIT(0)
+
+#define RG_PCS_AN_CTRL2		0x818
+#define USXGMII_LINK_TIMER_IDLE_DETECT	GENMASK(29, 20)
+#define USXGMII_LINK_TIMER_COMP_ACK_DETECT	GENMASK(19, 10)
+#define USXGMII_LINK_TIMER_AN_RESTART	GENMASK(9, 0)
+
+/* Register to read PCS AN status */
+#define RG_PCS_AN_STS0		0x81c
+#define USXGMII_PCS_AN_WORD	GENMASK(15, 0)
+#define USXGMII_LPA_LATCH	BIT(31)
+
+/* Register to control USXGMII XFI PLL digital */
+#define XFI_PLL_DIG_GLB8	0x08
+#define RG_XFI_PLL_EN		BIT(31)
+
+/* Register to control USXGMII XFI PLL analog */
+#define XFI_PLL_ANA_GLB8	0x108
+#define RG_XFI_PLL_ANA_SWWA	0x02283248
+
 /* Infrasys subsystem config registers */
 #define INFRA_MISC2            0x70c
 #define CO_QPHY_SEL            BIT(0)
 #define GEPHY_MAC_SEL          BIT(1)
 
+/* Toprgu subsystem config registers */
+#define TOPRGU_SWSYSRST		0x18
+#define SWSYSRST_UNLOCK_KEY	GENMASK(31, 24)
+#define SWSYSRST_XFI_PLL_GRST	BIT(16)
+#define SWSYSRST_XFI_PEXPT1_GRST	BIT(15)
+#define SWSYSRST_XFI_PEXPT0_GRST	BIT(14)
+#define SWSYSRST_XFI1_GRST	BIT(13)
+#define SWSYSRST_XFI0_GRST	BIT(12)
+#define SWSYSRST_SGMII1_GRST	BIT(2)
+#define SWSYSRST_SGMII0_GRST	BIT(1)
+#define TOPRGU_SWSYSRST_EN		0xFC
+
 /* Top misc registers */
+#define TOP_MISC_NETSYS_PCS_MUX	0x84
+#define NETSYS_PCS_MUX_MASK	GENMASK(1, 0)
+#define	MUX_G2_USXGMII_SEL	BIT(1)
+#define MUX_HSGMII1_G1_SEL	BIT(0)
+
 #define USB_PHY_SWITCH_REG	0x218
 #define QPHY_SEL_MASK		GENMASK(1, 0)
 #define SGMII_QPHY_SEL		0x2
@@ -589,6 +667,8 @@
 #define MT7628_SDM_RBCNT	(MT7628_SDM_OFFSET + 0x10c)
 #define MT7628_SDM_CS_ERR	(MT7628_SDM_OFFSET + 0x110)
 
+/* Debug Purpose Register */
+#define MTK_PSE_FQFC_CFG	0x100
 #define MTK_FE_CDM1_FSM		0x220
 #define MTK_FE_CDM2_FSM		0x224
 #define MTK_FE_CDM3_FSM		0x238
@@ -597,6 +677,11 @@
 #define MTK_FE_CDM6_FSM		0x328
 #define MTK_FE_GDM1_FSM		0x228
 #define MTK_FE_GDM2_FSM		0x22C
+#define MTK_FE_GDM3_FSM		0x23C
+#define MTK_FE_PSE_FREE		0x240
+#define MTK_FE_DROP_FQ		0x244
+#define MTK_FE_DROP_FC		0x248
+#define MTK_FE_DROP_PPE		0x24C
 
 #define MTK_MAC_FSM(x)		(0x1010C + ((x) * 0x100))
 
@@ -943,6 +1028,8 @@ enum mkt_eth_capabilities {
 	MTK_RGMII_BIT = 0,
 	MTK_TRGMII_BIT,
 	MTK_SGMII_BIT,
+	MTK_USXGMII_BIT,
+	MTK_2P5GPHY_BIT,
 	MTK_ESW_BIT,
 	MTK_GEPHY_BIT,
 	MTK_MUX_BIT,
@@ -963,8 +1050,11 @@ enum mkt_eth_capabilities {
 	MTK_ETH_MUX_GDM1_TO_GMAC1_ESW_BIT,
 	MTK_ETH_MUX_GMAC2_GMAC0_TO_GEPHY_BIT,
 	MTK_ETH_MUX_U3_GMAC2_TO_QPHY_BIT,
+	MTK_ETH_MUX_GMAC2_TO_2P5GPHY_BIT,
 	MTK_ETH_MUX_GMAC1_GMAC2_TO_SGMII_RGMII_BIT,
 	MTK_ETH_MUX_GMAC12_TO_GEPHY_SGMII_BIT,
+	MTK_ETH_MUX_GMAC123_TO_GEPHY_SGMII_BIT,
+	MTK_ETH_MUX_GMAC123_TO_USXGMII_BIT,
 
 	/* PATH BITS */
 	MTK_ETH_PATH_GMAC1_RGMII_BIT,
@@ -972,14 +1062,21 @@ enum mkt_eth_capabilities {
 	MTK_ETH_PATH_GMAC1_SGMII_BIT,
 	MTK_ETH_PATH_GMAC2_RGMII_BIT,
 	MTK_ETH_PATH_GMAC2_SGMII_BIT,
+	MTK_ETH_PATH_GMAC2_2P5GPHY_BIT,
 	MTK_ETH_PATH_GMAC2_GEPHY_BIT,
+	MTK_ETH_PATH_GMAC3_SGMII_BIT,
 	MTK_ETH_PATH_GDM1_ESW_BIT,
+	MTK_ETH_PATH_GMAC1_USXGMII_BIT,
+	MTK_ETH_PATH_GMAC2_USXGMII_BIT,
+	MTK_ETH_PATH_GMAC3_USXGMII_BIT,
 };
 
 /* Supported hardware group on SoCs */
 #define MTK_RGMII		BIT_ULL(MTK_RGMII_BIT)
 #define MTK_TRGMII		BIT_ULL(MTK_TRGMII_BIT)
 #define MTK_SGMII		BIT_ULL(MTK_SGMII_BIT)
+#define MTK_USXGMII		BIT_ULL(MTK_USXGMII_BIT)
+#define MTK_2P5GPHY		BIT_ULL(MTK_2P5GPHY_BIT)
 #define MTK_ESW			BIT_ULL(MTK_ESW_BIT)
 #define MTK_GEPHY		BIT_ULL(MTK_GEPHY_BIT)
 #define MTK_MUX			BIT_ULL(MTK_MUX_BIT)
@@ -1002,10 +1099,16 @@ enum mkt_eth_capabilities {
 	BIT_ULL(MTK_ETH_MUX_GMAC2_GMAC0_TO_GEPHY_BIT)
 #define MTK_ETH_MUX_U3_GMAC2_TO_QPHY		\
 	BIT_ULL(MTK_ETH_MUX_U3_GMAC2_TO_QPHY_BIT)
+#define MTK_ETH_MUX_GMAC2_TO_2P5GPHY		\
+	BIT_ULL(MTK_ETH_MUX_GMAC2_TO_2P5GPHY_BIT)
 #define MTK_ETH_MUX_GMAC1_GMAC2_TO_SGMII_RGMII	\
 	BIT_ULL(MTK_ETH_MUX_GMAC1_GMAC2_TO_SGMII_RGMII_BIT)
 #define MTK_ETH_MUX_GMAC12_TO_GEPHY_SGMII	\
 	BIT_ULL(MTK_ETH_MUX_GMAC12_TO_GEPHY_SGMII_BIT)
+#define MTK_ETH_MUX_GMAC123_TO_GEPHY_SGMII	\
+	BIT_ULL(MTK_ETH_MUX_GMAC123_TO_GEPHY_SGMII_BIT)
+#define MTK_ETH_MUX_GMAC123_TO_USXGMII	\
+	BIT_ULL(MTK_ETH_MUX_GMAC123_TO_USXGMII_BIT)
 
 /* Supported path present on SoCs */
 #define MTK_ETH_PATH_GMAC1_RGMII	BIT_ULL(MTK_ETH_PATH_GMAC1_RGMII_BIT)
@@ -1013,8 +1116,13 @@ enum mkt_eth_capabilities {
 #define MTK_ETH_PATH_GMAC1_SGMII	BIT_ULL(MTK_ETH_PATH_GMAC1_SGMII_BIT)
 #define MTK_ETH_PATH_GMAC2_RGMII	BIT_ULL(MTK_ETH_PATH_GMAC2_RGMII_BIT)
 #define MTK_ETH_PATH_GMAC2_SGMII	BIT_ULL(MTK_ETH_PATH_GMAC2_SGMII_BIT)
+#define MTK_ETH_PATH_GMAC2_2P5GPHY	BIT_ULL(MTK_ETH_PATH_GMAC2_2P5GPHY_BIT)
 #define MTK_ETH_PATH_GMAC2_GEPHY	BIT_ULL(MTK_ETH_PATH_GMAC2_GEPHY_BIT)
+#define MTK_ETH_PATH_GMAC3_SGMII	BIT_ULL(MTK_ETH_PATH_GMAC3_SGMII_BIT)
 #define MTK_ETH_PATH_GDM1_ESW		BIT_ULL(MTK_ETH_PATH_GDM1_ESW_BIT)
+#define MTK_ETH_PATH_GMAC1_USXGMII	BIT_ULL(MTK_ETH_PATH_GMAC1_USXGMII_BIT)
+#define MTK_ETH_PATH_GMAC2_USXGMII	BIT_ULL(MTK_ETH_PATH_GMAC2_USXGMII_BIT)
+#define MTK_ETH_PATH_GMAC3_USXGMII	BIT_ULL(MTK_ETH_PATH_GMAC3_USXGMII_BIT)
 
 #define MTK_GMAC1_RGMII		(MTK_ETH_PATH_GMAC1_RGMII | MTK_RGMII)
 #define MTK_GMAC1_TRGMII	(MTK_ETH_PATH_GMAC1_TRGMII | MTK_TRGMII)
@@ -1022,7 +1130,12 @@ enum mkt_eth_capabilities {
 #define MTK_GMAC2_RGMII		(MTK_ETH_PATH_GMAC2_RGMII | MTK_RGMII)
 #define MTK_GMAC2_SGMII		(MTK_ETH_PATH_GMAC2_SGMII | MTK_SGMII)
 #define MTK_GMAC2_GEPHY		(MTK_ETH_PATH_GMAC2_GEPHY | MTK_GEPHY)
+#define MTK_GMAC2_2P5GPHY	(MTK_ETH_PATH_GMAC2_2P5GPHY | MTK_2P5GPHY)
+#define MTK_GMAC3_SGMII		(MTK_ETH_PATH_GMAC3_SGMII | MTK_SGMII)
 #define MTK_GDM1_ESW		(MTK_ETH_PATH_GDM1_ESW | MTK_ESW)
+#define MTK_GMAC1_USXGMII	(MTK_ETH_PATH_GMAC1_USXGMII | MTK_USXGMII)
+#define MTK_GMAC2_USXGMII	(MTK_ETH_PATH_GMAC2_USXGMII | MTK_USXGMII)
+#define MTK_GMAC3_USXGMII	(MTK_ETH_PATH_GMAC3_USXGMII | MTK_USXGMII)
 
 /* MUXes present on SoCs */
 /* 0: GDM1 -> GMAC1, 1: GDM1 -> ESW */
@@ -1041,10 +1154,20 @@ enum mkt_eth_capabilities {
 	(MTK_ETH_MUX_GMAC1_GMAC2_TO_SGMII_RGMII | MTK_MUX | \
 	MTK_SHARED_SGMII)
 
+/* 2: GMAC2 -> XGMII */
+#define MTK_MUX_GMAC2_TO_2P5GPHY      \
+	(MTK_ETH_MUX_GMAC2_TO_2P5GPHY | MTK_MUX | MTK_INFRA)
+
 /* 0: GMACx -> GEPHY, 1: GMACx -> SGMII where x is 1 or 2 */
 #define MTK_MUX_GMAC12_TO_GEPHY_SGMII   \
 	(MTK_ETH_MUX_GMAC12_TO_GEPHY_SGMII | MTK_MUX)
 
+#define MTK_MUX_GMAC123_TO_GEPHY_SGMII   \
+	(MTK_ETH_MUX_GMAC123_TO_GEPHY_SGMII | MTK_MUX)
+
+#define MTK_MUX_GMAC123_TO_USXGMII   \
+	(MTK_ETH_MUX_GMAC123_TO_USXGMII | MTK_MUX | MTK_INFRA)
+
 #define MTK_HAS_CAPS(caps, _x)		(((caps) & (_x)) == (_x))
 
 #define MT7621_CAPS  (MTK_GMAC1_RGMII | MTK_GMAC1_TRGMII | \
@@ -1076,8 +1199,12 @@ enum mkt_eth_capabilities {
 		      MTK_MUX_GMAC12_TO_GEPHY_SGMII | MTK_QDMA | \
 		      MTK_RSTCTRL_PPE1 | MTK_SRAM)
 
-#define MT7988_CAPS  (MTK_36BIT_DMA | MTK_GDM1_ESW | MTK_QDMA | \
-		      MTK_RSTCTRL_PPE1 | MTK_RSTCTRL_PPE2 | MTK_SRAM)
+#define MT7988_CAPS  (MTK_36BIT_DMA | MTK_GDM1_ESW | MTK_GMAC1_SGMII | \
+		      MTK_GMAC2_2P5GPHY | MTK_GMAC2_SGMII | MTK_GMAC2_USXGMII | \
+		      MTK_GMAC3_SGMII | MTK_GMAC3_USXGMII | \
+		      MTK_MUX_GMAC123_TO_GEPHY_SGMII | \
+		      MTK_MUX_GMAC123_TO_USXGMII | MTK_MUX_GMAC2_TO_2P5GPHY | \
+		      MTK_QDMA | MTK_RSTCTRL_PPE1 | MTK_RSTCTRL_PPE2 | MTK_SRAM)
 
 struct mtk_tx_dma_desc_info {
 	dma_addr_t	addr;
@@ -1187,6 +1314,24 @@ struct mtk_soc_data {
 /* currently no SoC has more than 3 macs */
 #define MTK_MAX_DEVS	3
 
+/* struct mtk_usxgmii_pcs - This structure holds each usxgmii regmap and
+ *			associated data
+ * @regmap:		The register map pointing at the range used to setup
+ *			USXGMII modes
+ * @interface:		Currently selected interface mode
+ * @id:			The element is used to record the index of PCS
+ * @pcs:		Phylink PCS structure
+ */
+struct mtk_usxgmii_pcs {
+	struct mtk_eth		*eth;
+	struct regmap		*regmap;
+	struct phylink_pcs	*wrapped_sgmii_pcs;
+	phy_interface_t		interface;
+	u8			id;
+	unsigned int		mode;
+	struct phylink_pcs	pcs;
+};
+
 /* struct mtk_eth -	This is the main datasructure for holding the state
  *			of the driver
  * @dev:		The device pointer
@@ -1207,6 +1352,12 @@ struct mtk_soc_data {
  * @infra:              The register map pointing at the range used to setup
  *                      SGMII and GePHY path
  * @sgmii_pcs:		Pointers to mtk-pcs-lynxi phylink_pcs instances
+ * @sgmii_wrapped_pcs:	Pointers to NETSYSv3 wrapper PCS instances
+ * @usxgmii_pll:	The register map pointing at the range used to control
+ *			the USXGMII SerDes PLL
+ * @regmap_pextp:	The register map pointing at the range used to setup
+ *			PHYA
+ * @usxgmii_pcs:	Pointer to array of pointers to struct for USXGMII PCS
  * @pctl:		The register map pointing at the range used to setup
  *			GMAC port drive/slew values
  * @dma_refcnt:		track how many netdevs are using the DMA engine
@@ -1250,6 +1401,10 @@ struct mtk_eth {
 	struct regmap			*ethsys;
 	struct regmap			*infra;
 	struct phylink_pcs		*sgmii_pcs[MTK_MAX_DEVS];
+	struct regmap			*toprgu;
+	struct regmap			*usxgmii_pll;
+	struct regmap			*regmap_pextp[MTK_MAX_DEVS];
+	struct mtk_usxgmii_pcs		*usxgmii_pcs[MTK_MAX_DEVS];
 	struct regmap			*pctl;
 	bool				hwlro;
 	refcount_t			dma_refcnt;
@@ -1437,6 +1592,19 @@ static inline u32 mtk_get_ib2_multicast_
 	return MTK_FOE_IB2_MULTICAST;
 }
 
+static inline bool mtk_interface_mode_is_xgmii(phy_interface_t interface)
+{
+	switch (interface) {
+	case PHY_INTERFACE_MODE_INTERNAL:
+	case PHY_INTERFACE_MODE_USXGMII:
+	case PHY_INTERFACE_MODE_10GBASER:
+	case PHY_INTERFACE_MODE_5GBASER:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /* read the hardware status register */
 void mtk_stats_update_mac(struct mtk_mac *mac);
 
@@ -1445,8 +1613,10 @@ u32 mtk_r32(struct mtk_eth *eth, unsigne
 u32 mtk_m32(struct mtk_eth *eth, u32 mask, u32 set, unsigned int reg);
 
 int mtk_gmac_sgmii_path_setup(struct mtk_eth *eth, int mac_id);
+int mtk_gmac_2p5gphy_path_setup(struct mtk_eth *eth, int mac_id);
 int mtk_gmac_gephy_path_setup(struct mtk_eth *eth, int mac_id);
 int mtk_gmac_rgmii_path_setup(struct mtk_eth *eth, int mac_id);
+int mtk_gmac_usxgmii_path_setup(struct mtk_eth *eth, int mac_id);
 
 int mtk_eth_offload_init(struct mtk_eth *eth);
 int mtk_eth_setup_tc(struct net_device *dev, enum tc_setup_type type,
@@ -1456,5 +1626,63 @@ int mtk_flow_offload_cmd(struct mtk_eth
 void mtk_flow_offload_cleanup(struct mtk_eth *eth, struct list_head *list);
 void mtk_eth_set_dma_device(struct mtk_eth *eth, struct device *dma_dev);
 
+static inline int mtk_mac2xgmii_id(struct mtk_eth *eth, int mac_id)
+{
+	int xgmii_id = mac_id;
+
+	if (mtk_is_netsys_v3_or_greater(eth)) {
+		switch (mac_id) {
+		case MTK_GMAC1_ID:
+		case MTK_GMAC2_ID:
+			xgmii_id = 1;
+			break;
+		case MTK_GMAC3_ID:
+			xgmii_id = 0;
+			break;
+		default:
+			xgmii_id = -1;
+		}
+	}
+
+	return MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_SGMII) ? 0 : xgmii_id;
+}
+
+static inline int mtk_xgmii2mac_id(struct mtk_eth *eth, int xgmii_id)
+{
+	int mac_id = xgmii_id;
+
+	if (mtk_is_netsys_v3_or_greater(eth)) {
+		switch (xgmii_id) {
+		case 0:
+			mac_id = 2;
+			break;
+		case 1:
+			mac_id = 1;
+			break;
+		default:
+			mac_id = -1;
+		}
+	}
+
+	return mac_id;
+}
+
+#ifdef CONFIG_NET_MEDIATEK_SOC_USXGMII
+struct phylink_pcs *mtk_sgmii_wrapper_select_pcs(struct mtk_eth *eth, int id);
+struct phylink_pcs *mtk_usxgmii_select_pcs(struct mtk_eth *eth, int id);
+int mtk_usxgmii_init(struct mtk_eth *eth);
+#else
+static inline struct phylink_pcs *mtk_sgmii_wrapper_select_pcs(struct mtk_eth *eth, int id)
+{
+	return NULL;
+}
+
+static inline struct phylink_pcs *mtk_usxgmii_select_pcs(struct mtk_eth *eth, int id)
+{
+	return NULL;
+}
+
+static inline int mtk_usxgmii_init(struct mtk_eth *eth) { return 0; }
+#endif /* NET_MEDIATEK_SOC_USXGMII */
 
 #endif /* MTK_ETH_H */
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_usxgmii.c
@@ -0,0 +1,690 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ * Author: Henry Yen <henry.yen@mediatek.com>
+ *         Daniel Golle <daniel@makrotopia.org>
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include "mtk_eth_soc.h"
+
+static struct mtk_usxgmii_pcs *pcs_to_mtk_usxgmii_pcs(struct phylink_pcs *pcs)
+{
+	return container_of(pcs, struct mtk_usxgmii_pcs, pcs);
+}
+
+static int mtk_xfi_pextp_init(struct mtk_eth *eth)
+{
+	struct device *dev = eth->dev;
+	struct device_node *r = dev->of_node;
+	struct device_node *np;
+	int i;
+
+	for (i = 0; i < MTK_MAX_DEVS; i++) {
+		np = of_parse_phandle(r, "mediatek,xfi-pextp", i);
+		if (!np)
+			break;
+
+		eth->regmap_pextp[i] = syscon_node_to_regmap(np);
+		if (IS_ERR(eth->regmap_pextp[i]))
+			return PTR_ERR(eth->regmap_pextp[i]);
+	}
+
+	return 0;
+}
+
+static int mtk_xfi_pll_init(struct mtk_eth *eth)
+{
+	struct device_node *r = eth->dev->of_node;
+	struct device_node *np;
+
+	np = of_parse_phandle(r, "mediatek,xfi-pll", 0);
+	if (!np)
+		return -1;
+
+	eth->usxgmii_pll = syscon_node_to_regmap(np);
+	if (IS_ERR(eth->usxgmii_pll))
+		return PTR_ERR(eth->usxgmii_pll);
+
+	return 0;
+}
+
+static int mtk_toprgu_init(struct mtk_eth *eth)
+{
+	struct device_node *r = eth->dev->of_node;
+	struct device_node *np;
+
+	np = of_parse_phandle(r, "mediatek,toprgu", 0);
+	if (!np)
+		return -1;
+
+	eth->toprgu = syscon_node_to_regmap(np);
+	if (IS_ERR(eth->toprgu))
+		return PTR_ERR(eth->toprgu);
+
+	return 0;
+}
+
+static int mtk_xfi_pll_enable(struct mtk_eth *eth)
+{
+	u32 val = 0;
+
+	if (!eth->usxgmii_pll)
+		return -EINVAL;
+
+	/* Add software workaround for USXGMII PLL TCL issue */
+	regmap_write(eth->usxgmii_pll, XFI_PLL_ANA_GLB8, RG_XFI_PLL_ANA_SWWA);
+
+	regmap_read(eth->usxgmii_pll, XFI_PLL_DIG_GLB8, &val);
+	val |= RG_XFI_PLL_EN;
+	regmap_write(eth->usxgmii_pll, XFI_PLL_DIG_GLB8, val);
+
+	return 0;
+}
+
+static void mtk_usxgmii_setup_phya(struct regmap *pextp, phy_interface_t interface, int id)
+{
+	bool is_10g = (interface == PHY_INTERFACE_MODE_10GBASER ||
+		       interface == PHY_INTERFACE_MODE_USXGMII);
+	bool is_2p5g = (interface == PHY_INTERFACE_MODE_2500BASEX);
+	bool is_5g = (interface == PHY_INTERFACE_MODE_5GBASER);
+
+	/* Setup operation mode */
+	if (is_10g)
+		regmap_write(pextp, 0x9024, 0x00C9071C);
+	else
+		regmap_write(pextp, 0x9024, 0x00D9071C);
+
+	if (is_5g)
+		regmap_write(pextp, 0x2020, 0xAAA5A5AA);
+	else
+		regmap_write(pextp, 0x2020, 0xAA8585AA);
+
+	if (is_2p5g || is_5g || is_10g) {
+		regmap_write(pextp, 0x2030, 0x0C020707);
+		regmap_write(pextp, 0x2034, 0x0E050F0F);
+		regmap_write(pextp, 0x2040, 0x00140032);
+	} else {
+		regmap_write(pextp, 0x2030, 0x0C020207);
+		regmap_write(pextp, 0x2034, 0x0E05050F);
+		regmap_write(pextp, 0x2040, 0x00200032);
+	}
+
+	if (is_2p5g || is_10g)
+		regmap_write(pextp, 0x50F0, 0x00C014AA);
+	else if (is_5g)
+		regmap_write(pextp, 0x50F0, 0x00C018AA);
+	else
+		regmap_write(pextp, 0x50F0, 0x00C014BA);
+
+	if (is_5g) {
+		regmap_write(pextp, 0x50E0, 0x3777812B);
+		regmap_write(pextp, 0x506C, 0x005C9CFF);
+		regmap_write(pextp, 0x5070, 0x9DFAFAFA);
+		regmap_write(pextp, 0x5074, 0x273F3F3F);
+		regmap_write(pextp, 0x5078, 0xA8883868);
+		regmap_write(pextp, 0x507C, 0x14661466);
+	} else {
+		regmap_write(pextp, 0x50E0, 0x3777C12B);
+		regmap_write(pextp, 0x506C, 0x005F9CFF);
+		regmap_write(pextp, 0x5070, 0x9D9DFAFA);
+		regmap_write(pextp, 0x5074, 0x27273F3F);
+		regmap_write(pextp, 0x5078, 0xA7883C68);
+		regmap_write(pextp, 0x507C, 0x11661166);
+	}
+
+	if (is_2p5g || is_10g) {
+		regmap_write(pextp, 0x5080, 0x0E000AAF);
+		regmap_write(pextp, 0x5084, 0x08080D0D);
+		regmap_write(pextp, 0x5088, 0x02030909);
+	} else if (is_5g) {
+		regmap_write(pextp, 0x5080, 0x0E001ABF);
+		regmap_write(pextp, 0x5084, 0x080B0D0D);
+		regmap_write(pextp, 0x5088, 0x02050909);
+	} else {
+		regmap_write(pextp, 0x5080, 0x0E000EAF);
+		regmap_write(pextp, 0x5084, 0x08080E0D);
+		regmap_write(pextp, 0x5088, 0x02030B09);
+	}
+
+	if (is_5g) {
+		regmap_write(pextp, 0x50E4, 0x0C000000);
+		regmap_write(pextp, 0x50E8, 0x04000000);
+	} else {
+		regmap_write(pextp, 0x50E4, 0x0C0C0000);
+		regmap_write(pextp, 0x50E8, 0x04040000);
+	}
+
+	if (is_2p5g || mtk_interface_mode_is_xgmii(interface))
+		regmap_write(pextp, 0x50EC, 0x0F0F0C06);
+	else
+		regmap_write(pextp, 0x50EC, 0x0F0F0606);
+
+	if (is_5g) {
+		regmap_write(pextp, 0x50A8, 0x50808C8C);
+		regmap_write(pextp, 0x6004, 0x18000000);
+	} else {
+		regmap_write(pextp, 0x50A8, 0x506E8C8C);
+		regmap_write(pextp, 0x6004, 0x18190000);
+	}
+
+	if (is_10g)
+		regmap_write(pextp, 0x00F8, 0x01423342);
+	else if (is_5g)
+		regmap_write(pextp, 0x00F8, 0x00A132A1);
+	else if (is_2p5g)
+		regmap_write(pextp, 0x00F8, 0x009C329C);
+	else
+		regmap_write(pextp, 0x00F8, 0x00FA32FA);
+
+	/* Force SGDT_OUT off and select PCS */
+	if (mtk_interface_mode_is_xgmii(interface))
+		regmap_write(pextp, 0x00F4, 0x80201F20);
+	else
+		regmap_write(pextp, 0x00F4, 0x80201F21);
+
+	/* Force GLB_CKDET_OUT */
+	regmap_write(pextp, 0x0030, 0x00050C00);
+
+	/* Force AEQ on */
+	regmap_write(pextp, 0x0070, 0x02002800);
+	ndelay(1020);
+
+	/* Setup DA default value */
+	regmap_write(pextp, 0x30B0, 0x00000020);
+	regmap_write(pextp, 0x3028, 0x00008A01);
+	regmap_write(pextp, 0x302C, 0x0000A884);
+	regmap_write(pextp, 0x3024, 0x00083002);
+	if (mtk_interface_mode_is_xgmii(interface)) {
+		regmap_write(pextp, 0x3010, 0x00022220);
+		regmap_write(pextp, 0x5064, 0x0F020A01);
+		regmap_write(pextp, 0x50B4, 0x06100600);
+		if (interface == PHY_INTERFACE_MODE_USXGMII)
+			regmap_write(pextp, 0x3048, 0x40704000);
+		else
+			regmap_write(pextp, 0x3048, 0x47684100);
+	} else {
+		regmap_write(pextp, 0x3010, 0x00011110);
+		regmap_write(pextp, 0x3048, 0x40704000);
+	}
+
+	if (!mtk_interface_mode_is_xgmii(interface) && !is_2p5g)
+		regmap_write(pextp, 0x3064, 0x0000C000);
+
+	if (interface == PHY_INTERFACE_MODE_USXGMII) {
+		regmap_write(pextp, 0x3050, 0xA8000000);
+		regmap_write(pextp, 0x3054, 0x000000AA);
+	} else if (mtk_interface_mode_is_xgmii(interface)) {
+		regmap_write(pextp, 0x3050, 0x00000000);
+		regmap_write(pextp, 0x3054, 0x00000000);
+	} else {
+		regmap_write(pextp, 0x3050, 0xA8000000);
+		regmap_write(pextp, 0x3054, 0x000000AA);
+	}
+
+	if (mtk_interface_mode_is_xgmii(interface))
+		regmap_write(pextp, 0x306C, 0x00000F00);
+	else if (is_2p5g)
+		regmap_write(pextp, 0x306C, 0x22000F00);
+	else
+		regmap_write(pextp, 0x306C, 0x20200F00);
+
+	if (interface == PHY_INTERFACE_MODE_10GBASER && id == 0)
+		regmap_write(pextp, 0xA008, 0x0007B400);
+
+	if (mtk_interface_mode_is_xgmii(interface))
+		regmap_write(pextp, 0xA060, 0x00040000);
+	else
+		regmap_write(pextp, 0xA060, 0x00050000);
+
+	if (is_10g)
+		regmap_write(pextp, 0x90D0, 0x00000001);
+	else if (is_5g)
+		regmap_write(pextp, 0x90D0, 0x00000003);
+	else if (is_2p5g)
+		regmap_write(pextp, 0x90D0, 0x00000005);
+	else
+		regmap_write(pextp, 0x90D0, 0x00000007);
+
+	/* Release reset */
+	regmap_write(pextp, 0x0070, 0x0200E800);
+	usleep_range(150, 500);
+
+	/* Switch to P0 */
+	regmap_write(pextp, 0x0070, 0x0200C111);
+	ndelay(1020);
+	regmap_write(pextp, 0x0070, 0x0200C101);
+	usleep_range(15, 50);
+
+	if (mtk_interface_mode_is_xgmii(interface)) {
+		/* Switch to Gen3 */
+		regmap_write(pextp, 0x0070, 0x0202C111);
+	} else {
+		/* Switch to Gen2 */
+		regmap_write(pextp, 0x0070, 0x0201C111);
+	}
+	ndelay(1020);
+	if (mtk_interface_mode_is_xgmii(interface))
+		regmap_write(pextp, 0x0070, 0x0202C101);
+	else
+		regmap_write(pextp, 0x0070, 0x0201C101);
+	usleep_range(100, 500);
+	regmap_write(pextp, 0x30B0, 0x00000030);
+	if (mtk_interface_mode_is_xgmii(interface))
+		regmap_write(pextp, 0x00F4, 0x80201F00);
+	else
+		regmap_write(pextp, 0x00F4, 0x80201F01);
+
+	regmap_write(pextp, 0x3040, 0x30000000);
+	usleep_range(400, 1000);
+}
+
+static void mtk_usxgmii_reset(struct mtk_eth *eth, int id)
+{
+	u32 toggle, val;
+
+	if (id >= MTK_MAX_DEVS || !eth->toprgu)
+		return;
+
+	switch (id) {
+	case 0:
+		toggle = SWSYSRST_XFI_PEXPT0_GRST | SWSYSRST_XFI0_GRST |
+			 SWSYSRST_SGMII0_GRST;
+		break;
+	case 1:
+		toggle = SWSYSRST_XFI_PEXPT1_GRST | SWSYSRST_XFI1_GRST |
+			 SWSYSRST_SGMII1_GRST;
+		break;
+	default:
+		return;
+	}
+
+	/* Enable software reset */
+	regmap_set_bits(eth->toprgu, TOPRGU_SWSYSRST_EN, toggle);
+
+	/* Assert USXGMII reset */
+	regmap_set_bits(eth->toprgu, TOPRGU_SWSYSRST,
+			FIELD_PREP(SWSYSRST_UNLOCK_KEY, 0x88) | toggle);
+
+	usleep_range(100, 500);
+
+	/* De-assert USXGMII reset */
+	regmap_read(eth->toprgu, TOPRGU_SWSYSRST, &val);
+	val |= FIELD_PREP(SWSYSRST_UNLOCK_KEY, 0x88);
+	val &= ~toggle;
+	regmap_write(eth->toprgu, TOPRGU_SWSYSRST, val);
+
+	/* Disable software reset */
+	regmap_clear_bits(eth->toprgu, TOPRGU_SWSYSRST_EN, toggle);
+
+	mdelay(10);
+}
+
+/* As the USXGMII PHYA is shared with the 1000Base-X/2500Base-X/Cisco SGMII unit
+ * the psc-mtk-lynxi instance needs to be wrapped, so that calls to .pcs_config
+ * also trigger an initial reset and subsequent configuration of the PHYA.
+ */
+struct mtk_sgmii_wrapper_pcs {
+	struct mtk_eth		*eth;
+	struct phylink_pcs	*wrapped_pcs;
+	u8			id;
+	struct phylink_pcs	pcs;
+};
+
+static int mtk_sgmii_wrapped_pcs_config(struct phylink_pcs *pcs,
+					unsigned int mode,
+					phy_interface_t interface,
+					const unsigned long *advertising,
+					bool permit_pause_to_mac)
+{
+	struct mtk_sgmii_wrapper_pcs *wp = container_of(pcs, struct mtk_sgmii_wrapper_pcs, pcs);
+	bool full_reconf;
+	int ret;
+
+	full_reconf = interface != wp->eth->usxgmii_pcs[wp->id]->interface;
+	if (full_reconf) {
+		mtk_xfi_pll_enable(wp->eth);
+		mtk_usxgmii_reset(wp->eth, wp->id);
+	}
+
+	ret = wp->wrapped_pcs->ops->pcs_config(wp->wrapped_pcs, mode, interface,
+					       advertising, permit_pause_to_mac);
+
+	if (full_reconf)
+		mtk_usxgmii_setup_phya(wp->eth->regmap_pextp[wp->id], interface, wp->id);
+
+	wp->eth->usxgmii_pcs[wp->id]->interface = interface;
+
+	return ret;
+}
+
+static void mtk_sgmii_wrapped_pcs_get_state(struct phylink_pcs *pcs,
+					    struct phylink_link_state *state)
+{
+	struct mtk_sgmii_wrapper_pcs *wp = container_of(pcs, struct mtk_sgmii_wrapper_pcs, pcs);
+
+	return wp->wrapped_pcs->ops->pcs_get_state(wp->wrapped_pcs, state);
+}
+
+static void mtk_sgmii_wrapped_pcs_an_restart(struct phylink_pcs *pcs)
+{
+	struct mtk_sgmii_wrapper_pcs *wp = container_of(pcs, struct mtk_sgmii_wrapper_pcs, pcs);
+
+	wp->wrapped_pcs->ops->pcs_an_restart(wp->wrapped_pcs);
+}
+
+static void mtk_sgmii_wrapped_pcs_link_up(struct phylink_pcs *pcs,
+					  unsigned int mode,
+					  phy_interface_t interface, int speed,
+					  int duplex)
+{
+	struct mtk_sgmii_wrapper_pcs *wp = container_of(pcs, struct mtk_sgmii_wrapper_pcs, pcs);
+
+	wp->wrapped_pcs->ops->pcs_link_up(wp->wrapped_pcs, mode, interface, speed, duplex);
+}
+
+static void mtk_sgmii_wrapped_pcs_disable(struct phylink_pcs *pcs)
+{
+	struct mtk_sgmii_wrapper_pcs *wp = container_of(pcs, struct mtk_sgmii_wrapper_pcs, pcs);
+
+	wp->wrapped_pcs->ops->pcs_disable(wp->wrapped_pcs);
+
+	wp->eth->usxgmii_pcs[wp->id]->interface = PHY_INTERFACE_MODE_NA;
+}
+
+static const struct phylink_pcs_ops mtk_sgmii_wrapped_pcs_ops = {
+	.pcs_get_state = mtk_sgmii_wrapped_pcs_get_state,
+	.pcs_config = mtk_sgmii_wrapped_pcs_config,
+	.pcs_an_restart = mtk_sgmii_wrapped_pcs_an_restart,
+	.pcs_link_up = mtk_sgmii_wrapped_pcs_link_up,
+	.pcs_disable = mtk_sgmii_wrapped_pcs_disable,
+};
+
+static int mtk_sgmii_wrapper_init(struct mtk_eth *eth)
+{
+	struct mtk_sgmii_wrapper_pcs *wp;
+	int i;
+
+	for (i = 0; i < MTK_MAX_DEVS; i++) {
+		if (!eth->sgmii_pcs[i])
+			continue;
+
+		if (!eth->usxgmii_pcs[i])
+			continue;
+
+		/* Make sure all PCS ops are supported by wrapped PCS */
+		if (!eth->sgmii_pcs[i]->ops->pcs_get_state ||
+		    !eth->sgmii_pcs[i]->ops->pcs_config ||
+		    !eth->sgmii_pcs[i]->ops->pcs_an_restart ||
+		    !eth->sgmii_pcs[i]->ops->pcs_link_up ||
+		    !eth->sgmii_pcs[i]->ops->pcs_disable)
+			return -EOPNOTSUPP;
+
+		wp = devm_kzalloc(eth->dev, sizeof(*wp), GFP_KERNEL);
+		if (!wp)
+			return -ENOMEM;
+
+		wp->wrapped_pcs = eth->sgmii_pcs[i];
+		wp->id = i;
+		wp->pcs.poll = true;
+		wp->pcs.ops = &mtk_sgmii_wrapped_pcs_ops;
+		wp->eth = eth;
+
+		eth->usxgmii_pcs[i]->wrapped_sgmii_pcs = &wp->pcs;
+	}
+
+	return 0;
+}
+
+struct phylink_pcs *mtk_sgmii_wrapper_select_pcs(struct mtk_eth *eth, int mac_id)
+{
+	u32 xgmii_id = mtk_mac2xgmii_id(eth, mac_id);
+
+	if (!eth->usxgmii_pcs[xgmii_id])
+		return NULL;
+
+	return eth->usxgmii_pcs[xgmii_id]->wrapped_sgmii_pcs;
+}
+
+static int mtk_usxgmii_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
+				  phy_interface_t interface,
+				  const unsigned long *advertising,
+				  bool permit_pause_to_mac)
+{
+	struct mtk_usxgmii_pcs *mpcs = pcs_to_mtk_usxgmii_pcs(pcs);
+	struct mtk_eth *eth = mpcs->eth;
+	struct regmap *pextp = eth->regmap_pextp[mpcs->id];
+	unsigned int an_ctrl = 0, link_timer = 0, xfi_mode = 0, adapt_mode = 0;
+	bool mode_changed = false;
+
+	if (!pextp)
+		return -ENODEV;
+
+	if (interface == PHY_INTERFACE_MODE_USXGMII) {
+		an_ctrl = FIELD_PREP(USXGMII_AN_SYNC_CNT, 0x1FF) | USXGMII_AN_ENABLE;
+		link_timer = FIELD_PREP(USXGMII_LINK_TIMER_IDLE_DETECT, 0x7B) |
+			     FIELD_PREP(USXGMII_LINK_TIMER_COMP_ACK_DETECT, 0x7B) |
+			     FIELD_PREP(USXGMII_LINK_TIMER_AN_RESTART, 0x7B);
+		xfi_mode = FIELD_PREP(USXGMII_XFI_RX_MODE, USXGMII_XFI_RX_MODE_10G) |
+			   FIELD_PREP(USXGMII_XFI_TX_MODE, USXGMII_XFI_TX_MODE_10G);
+	} else if (interface == PHY_INTERFACE_MODE_10GBASER) {
+		an_ctrl = FIELD_PREP(USXGMII_AN_SYNC_CNT, 0x1FF);
+		link_timer = FIELD_PREP(USXGMII_LINK_TIMER_IDLE_DETECT, 0x7B) |
+			     FIELD_PREP(USXGMII_LINK_TIMER_COMP_ACK_DETECT, 0x7B) |
+			     FIELD_PREP(USXGMII_LINK_TIMER_AN_RESTART, 0x7B);
+		xfi_mode = FIELD_PREP(USXGMII_XFI_RX_MODE, USXGMII_XFI_RX_MODE_10G) |
+			   FIELD_PREP(USXGMII_XFI_TX_MODE, USXGMII_XFI_TX_MODE_10G);
+		adapt_mode = USXGMII_RATE_UPDATE_MODE;
+	} else if (interface == PHY_INTERFACE_MODE_5GBASER) {
+		an_ctrl = FIELD_PREP(USXGMII_AN_SYNC_CNT, 0xFF);
+		link_timer = FIELD_PREP(USXGMII_LINK_TIMER_IDLE_DETECT, 0x3D) |
+			     FIELD_PREP(USXGMII_LINK_TIMER_COMP_ACK_DETECT, 0x3D) |
+			     FIELD_PREP(USXGMII_LINK_TIMER_AN_RESTART, 0x3D);
+		xfi_mode = FIELD_PREP(USXGMII_XFI_RX_MODE, USXGMII_XFI_RX_MODE_5G) |
+			   FIELD_PREP(USXGMII_XFI_TX_MODE, USXGMII_XFI_TX_MODE_5G);
+		adapt_mode = USXGMII_RATE_UPDATE_MODE;
+	} else {
+		return -EINVAL;
+	}
+
+	adapt_mode |= FIELD_PREP(USXGMII_RATE_ADAPT_MODE, USXGMII_RATE_ADAPT_MODE_X1);
+
+	if (mpcs->interface != interface) {
+		mpcs->interface = interface;
+		mode_changed = true;
+	}
+
+	mtk_xfi_pll_enable(eth);
+	mtk_usxgmii_reset(eth, mpcs->id);
+
+	/* Setup USXGMII AN ctrl */
+	regmap_update_bits(mpcs->regmap, RG_PCS_AN_CTRL0,
+			   USXGMII_AN_SYNC_CNT | USXGMII_AN_ENABLE,
+			   an_ctrl);
+
+	regmap_update_bits(mpcs->regmap, RG_PCS_AN_CTRL2,
+			   USXGMII_LINK_TIMER_IDLE_DETECT |
+			   USXGMII_LINK_TIMER_COMP_ACK_DETECT |
+			   USXGMII_LINK_TIMER_AN_RESTART,
+			   link_timer);
+
+	mpcs->mode = mode;
+
+	/* Gated MAC CK */
+	regmap_update_bits(mpcs->regmap, RG_PHY_TOP_SPEED_CTRL1,
+			   USXGMII_MAC_CK_GATED, USXGMII_MAC_CK_GATED);
+
+	/* Enable interface force mode */
+	regmap_update_bits(mpcs->regmap, RG_PHY_TOP_SPEED_CTRL1,
+			   USXGMII_IF_FORCE_EN, USXGMII_IF_FORCE_EN);
+
+	/* Setup USXGMII adapt mode */
+	regmap_update_bits(mpcs->regmap, RG_PHY_TOP_SPEED_CTRL1,
+			   USXGMII_RATE_UPDATE_MODE | USXGMII_RATE_ADAPT_MODE,
+			   adapt_mode);
+
+	/* Setup USXGMII speed */
+	regmap_update_bits(mpcs->regmap, RG_PHY_TOP_SPEED_CTRL1,
+			   USXGMII_XFI_RX_MODE | USXGMII_XFI_TX_MODE,
+			   xfi_mode);
+
+	usleep_range(1, 10);
+
+	/* Un-gated MAC CK */
+	regmap_update_bits(mpcs->regmap, RG_PHY_TOP_SPEED_CTRL1,
+			   USXGMII_MAC_CK_GATED, 0);
+
+	usleep_range(1, 10);
+
+	/* Disable interface force mode for the AN mode */
+	if (an_ctrl & USXGMII_AN_ENABLE)
+		regmap_update_bits(mpcs->regmap, RG_PHY_TOP_SPEED_CTRL1,
+				   USXGMII_IF_FORCE_EN, 0);
+
+	/* Setup USXGMIISYS with the determined property */
+	mtk_usxgmii_setup_phya(pextp, interface, mpcs->id);
+
+	return mode_changed;
+}
+
+static void mtk_usxgmii_pcs_get_state(struct phylink_pcs *pcs,
+				      struct phylink_link_state *state)
+{
+	struct mtk_usxgmii_pcs *mpcs = pcs_to_mtk_usxgmii_pcs(pcs);
+	struct mtk_eth *eth = mpcs->eth;
+	struct mtk_mac *mac = eth->mac[mtk_xgmii2mac_id(eth, mpcs->id)];
+	u32 val = 0;
+
+	regmap_read(mpcs->regmap, RG_PCS_AN_CTRL0, &val);
+	if (FIELD_GET(USXGMII_AN_ENABLE, val)) {
+		/* Refresh LPA by inverting LPA_LATCH */
+		regmap_read(mpcs->regmap, RG_PCS_AN_STS0, &val);
+		regmap_update_bits(mpcs->regmap, RG_PCS_AN_STS0,
+				   USXGMII_LPA_LATCH,
+				   !(val & USXGMII_LPA_LATCH));
+
+		regmap_read(mpcs->regmap, RG_PCS_AN_STS0, &val);
+
+		phylink_decode_usxgmii_word(state, FIELD_GET(USXGMII_PCS_AN_WORD,
+							     val));
+
+		state->interface = mpcs->interface;
+	} else {
+		val = mtk_r32(mac->hw, MTK_XGMAC_STS(mac->id));
+
+		if (mac->id == MTK_GMAC2_ID)
+			val >>= 16;
+
+		switch (FIELD_GET(MTK_USXGMII_PCS_MODE, val)) {
+		case 0:
+			state->speed = SPEED_10000;
+			break;
+		case 1:
+			state->speed = SPEED_5000;
+			break;
+		case 2:
+			state->speed = SPEED_2500;
+			break;
+		case 3:
+			state->speed = SPEED_1000;
+			break;
+		}
+
+		state->interface = mpcs->interface;
+		state->link = FIELD_GET(MTK_USXGMII_PCS_LINK, val);
+		state->duplex = DUPLEX_FULL;
+	}
+
+	/* Continuously repeat re-configuration sequence until link comes up */
+	if (state->link == 0)
+		mtk_usxgmii_pcs_config(pcs, mpcs->mode,
+				       state->interface, NULL, false);
+}
+
+static void mtk_usxgmii_pcs_restart_an(struct phylink_pcs *pcs)
+{
+	struct mtk_usxgmii_pcs *mpcs = pcs_to_mtk_usxgmii_pcs(pcs);
+	unsigned int val = 0;
+
+	if (!mpcs->regmap)
+		return;
+
+	regmap_read(mpcs->regmap, RG_PCS_AN_CTRL0, &val);
+	val |= USXGMII_AN_RESTART;
+	regmap_write(mpcs->regmap, RG_PCS_AN_CTRL0, val);
+}
+
+static void mtk_usxgmii_pcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
+				    phy_interface_t interface,
+				    int speed, int duplex)
+{
+	/* Reconfiguring USXGMII to ensure the quality of the RX signal
+	 * after the line side link up.
+	 */
+	mtk_usxgmii_pcs_config(pcs, mode,
+			       interface, NULL, false);
+}
+
+static const struct phylink_pcs_ops mtk_usxgmii_pcs_ops = {
+	.pcs_config = mtk_usxgmii_pcs_config,
+	.pcs_get_state = mtk_usxgmii_pcs_get_state,
+	.pcs_an_restart = mtk_usxgmii_pcs_restart_an,
+	.pcs_link_up = mtk_usxgmii_pcs_link_up,
+};
+
+int mtk_usxgmii_init(struct mtk_eth *eth)
+{
+	struct device_node *r = eth->dev->of_node;
+	struct device *dev = eth->dev;
+	struct device_node *np;
+	int i, ret;
+
+	for (i = 0; i < MTK_MAX_DEVS; i++) {
+		np = of_parse_phandle(r, "mediatek,usxgmiisys", i);
+		if (!np)
+			break;
+
+		eth->usxgmii_pcs[i] = devm_kzalloc(dev, sizeof(*eth->usxgmii_pcs[i]), GFP_KERNEL);
+		if (!eth->usxgmii_pcs[i])
+			return -ENOMEM;
+
+		eth->usxgmii_pcs[i]->id = i;
+		eth->usxgmii_pcs[i]->eth = eth;
+		eth->usxgmii_pcs[i]->regmap = syscon_node_to_regmap(np);
+		if (IS_ERR(eth->usxgmii_pcs[i]->regmap))
+			return PTR_ERR(eth->usxgmii_pcs[i]->regmap);
+
+		eth->usxgmii_pcs[i]->pcs.ops = &mtk_usxgmii_pcs_ops;
+		eth->usxgmii_pcs[i]->pcs.poll = true;
+		eth->usxgmii_pcs[i]->interface = PHY_INTERFACE_MODE_NA;
+		eth->usxgmii_pcs[i]->mode = -1;
+
+		of_node_put(np);
+	}
+
+	ret = mtk_xfi_pextp_init(eth);
+	if (ret)
+		return ret;
+
+	ret = mtk_xfi_pll_init(eth);
+	if (ret)
+		return ret;
+
+	ret = mtk_toprgu_init(eth);
+	if (ret)
+		return ret;
+
+	return mtk_sgmii_wrapper_init(eth);
+}
+
+struct phylink_pcs *mtk_usxgmii_select_pcs(struct mtk_eth *eth, int mac_id)
+{
+	u32 xgmii_id = mtk_mac2xgmii_id(eth, mac_id);
+
+	if (!eth->usxgmii_pcs[xgmii_id]->regmap)
+		return NULL;
+
+	return &eth->usxgmii_pcs[xgmii_id]->pcs;
+}