mlxbf_gige: add MDIO support for BlueField-3

This patch adds initial MDIO support for the BlueField-3
SoC. Separate header files for the BlueField-2 and the
BlueField-3 SoCs have been created.  These header files
hold the SoC-specific MDIO macros since the register
offsets and bit fields have changed.  Also, in BlueField-3
there is a separate register for writing and reading the
MDIO data.  Finally, instead of having "if" statements
everywhere to differentiate between SoC-specific logic,
a mlxbf_gige_mdio_gw_t struct was created for this purpose.

Signed-off-by: David Thompson <davthompson@nvidia.com>
Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

6 files changed, 251 insertions, 50 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige.h b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige.h
index 5a1027b07215..421a0b1b766c 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige.h
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige.h
@@ -67,6 +67,23 @@ struct mlxbf_gige_stats {
 	u64 rx_filter_discard_pkts;
 };
 
+struct mlxbf_gige_reg_param {
+	u32 mask;
+	u32 shift;
+};
+
+struct mlxbf_gige_mdio_gw {
+	u32 gw_address;
+	u32 read_data_address;
+	struct mlxbf_gige_reg_param busy;
+	struct mlxbf_gige_reg_param write_data;
+	struct mlxbf_gige_reg_param read_data;
+	struct mlxbf_gige_reg_param devad;
+	struct mlxbf_gige_reg_param partad;
+	struct mlxbf_gige_reg_param opcode;
+	struct mlxbf_gige_reg_param st1;
+};
+
 struct mlxbf_gige {
 	void __iomem *base;
 	void __iomem *llu_base;
@@ -102,6 +119,8 @@ struct mlxbf_gige {
 	u8 valid_polarity;
 	struct napi_struct napi;
 	struct mlxbf_gige_stats stats;
+	u8 hw_version;
+	struct mlxbf_gige_mdio_gw *mdio_gw;
 };
 
 /* Rx Work Queue Element definitions */
diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
index 2292d63a279c..e08c07e914c1 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
@@ -315,6 +315,8 @@ static int mlxbf_gige_probe(struct platform_device *pdev)
 
 	spin_lock_init(&priv->lock);
 
+	priv->hw_version = readq(base + MLXBF_GIGE_VERSION);
+
 	/* Attach MDIO device */
 	err = mlxbf_gige_mdio_probe(pdev, priv);
 	if (err)
diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio.c b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio.c
index aa780b1614a3..7ac06fd31011 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio.c
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio.c
@@ -23,9 +23,75 @@
 
 #include "mlxbf_gige.h"
 #include "mlxbf_gige_regs.h"
+#include "mlxbf_gige_mdio_bf2.h"
+#include "mlxbf_gige_mdio_bf3.h"
 
-#define MLXBF_GIGE_MDIO_GW_OFFSET	0x0
-#define MLXBF_GIGE_MDIO_CFG_OFFSET	0x4
+static struct mlxbf_gige_mdio_gw mlxbf_gige_mdio_gw_t[] = {
+	[MLXBF_GIGE_VERSION_BF2] = {
+		.gw_address = MLXBF2_GIGE_MDIO_GW_OFFSET,
+		.read_data_address = MLXBF2_GIGE_MDIO_GW_OFFSET,
+		.busy = {
+			.mask = MLXBF2_GIGE_MDIO_GW_BUSY_MASK,
+			.shift = MLXBF2_GIGE_MDIO_GW_BUSY_SHIFT,
+		},
+		.read_data = {
+			.mask = MLXBF2_GIGE_MDIO_GW_AD_MASK,
+			.shift = MLXBF2_GIGE_MDIO_GW_AD_SHIFT,
+		},
+		.write_data = {
+			.mask = MLXBF2_GIGE_MDIO_GW_AD_MASK,
+			.shift = MLXBF2_GIGE_MDIO_GW_AD_SHIFT,
+		},
+		.devad = {
+			.mask = MLXBF2_GIGE_MDIO_GW_DEVAD_MASK,
+			.shift = MLXBF2_GIGE_MDIO_GW_DEVAD_SHIFT,
+		},
+		.partad = {
+			.mask = MLXBF2_GIGE_MDIO_GW_PARTAD_MASK,
+			.shift = MLXBF2_GIGE_MDIO_GW_PARTAD_SHIFT,
+		},
+		.opcode = {
+			.mask = MLXBF2_GIGE_MDIO_GW_OPCODE_MASK,
+			.shift = MLXBF2_GIGE_MDIO_GW_OPCODE_SHIFT,
+		},
+		.st1 = {
+			.mask = MLXBF2_GIGE_MDIO_GW_ST1_MASK,
+			.shift = MLXBF2_GIGE_MDIO_GW_ST1_SHIFT,
+		},
+	},
+	[MLXBF_GIGE_VERSION_BF3] = {
+		.gw_address = MLXBF3_GIGE_MDIO_GW_OFFSET,
+		.read_data_address = MLXBF3_GIGE_MDIO_DATA_READ,
+		.busy = {
+			.mask = MLXBF3_GIGE_MDIO_GW_BUSY_MASK,
+			.shift = MLXBF3_GIGE_MDIO_GW_BUSY_SHIFT,
+		},
+		.read_data = {
+			.mask = MLXBF3_GIGE_MDIO_GW_DATA_READ_MASK,
+			.shift = MLXBF3_GIGE_MDIO_GW_DATA_READ_SHIFT,
+		},
+		.write_data = {
+			.mask = MLXBF3_GIGE_MDIO_GW_DATA_MASK,
+			.shift = MLXBF3_GIGE_MDIO_GW_DATA_SHIFT,
+		},
+		.devad = {
+			.mask = MLXBF3_GIGE_MDIO_GW_DEVAD_MASK,
+			.shift = MLXBF3_GIGE_MDIO_GW_DEVAD_SHIFT,
+		},
+		.partad = {
+			.mask = MLXBF3_GIGE_MDIO_GW_PARTAD_MASK,
+			.shift = MLXBF3_GIGE_MDIO_GW_PARTAD_SHIFT,
+		},
+		.opcode = {
+			.mask = MLXBF3_GIGE_MDIO_GW_OPCODE_MASK,
+			.shift = MLXBF3_GIGE_MDIO_GW_OPCODE_SHIFT,
+		},
+		.st1 = {
+			.mask = MLXBF3_GIGE_MDIO_GW_ST1_MASK,
+			.shift = MLXBF3_GIGE_MDIO_GW_ST1_SHIFT,
+		},
+	},
+};
 
 #define MLXBF_GIGE_MDIO_FREQ_REFERENCE 156250000ULL
 #define MLXBF_GIGE_MDIO_COREPLL_CONST  16384ULL
@@ -47,30 +113,10 @@
 /* Busy bit is set by software and cleared by hardware */
 #define MLXBF_GIGE_MDIO_SET_BUSY	0x1
 
-/* MDIO GW register bits */
-#define MLXBF_GIGE_MDIO_GW_AD_MASK	GENMASK(15, 0)
-#define MLXBF_GIGE_MDIO_GW_DEVAD_MASK	GENMASK(20, 16)
-#define MLXBF_GIGE_MDIO_GW_PARTAD_MASK	GENMASK(25, 21)
-#define MLXBF_GIGE_MDIO_GW_OPCODE_MASK	GENMASK(27, 26)
-#define MLXBF_GIGE_MDIO_GW_ST1_MASK	GENMASK(28, 28)
-#define MLXBF_GIGE_MDIO_GW_BUSY_MASK	GENMASK(30, 30)
-
-/* MDIO config register bits */
-#define MLXBF_GIGE_MDIO_CFG_MDIO_MODE_MASK		GENMASK(1, 0)
-#define MLXBF_GIGE_MDIO_CFG_MDIO3_3_MASK		GENMASK(2, 2)
-#define MLXBF_GIGE_MDIO_CFG_MDIO_FULL_DRIVE_MASK	GENMASK(4, 4)
-#define MLXBF_GIGE_MDIO_CFG_MDC_PERIOD_MASK		GENMASK(15, 8)
-#define MLXBF_GIGE_MDIO_CFG_MDIO_IN_SAMP_MASK		GENMASK(23, 16)
-#define MLXBF_GIGE_MDIO_CFG_MDIO_OUT_SAMP_MASK		GENMASK(31, 24)
-
-#define MLXBF_GIGE_MDIO_CFG_VAL (FIELD_PREP(MLXBF_GIGE_MDIO_CFG_MDIO_MODE_MASK, 1) | \
-				 FIELD_PREP(MLXBF_GIGE_MDIO_CFG_MDIO3_3_MASK, 1) | \
-				 FIELD_PREP(MLXBF_GIGE_MDIO_CFG_MDIO_FULL_DRIVE_MASK, 1) | \
-				 FIELD_PREP(MLXBF_GIGE_MDIO_CFG_MDIO_IN_SAMP_MASK, 6) | \
-				 FIELD_PREP(MLXBF_GIGE_MDIO_CFG_MDIO_OUT_SAMP_MASK, 13))
-
 #define MLXBF_GIGE_BF2_COREPLL_ADDR 0x02800c30
 #define MLXBF_GIGE_BF2_COREPLL_SIZE 0x0000000c
+#define MLXBF_GIGE_BF3_COREPLL_ADDR 0x13409824
+#define MLXBF_GIGE_BF3_COREPLL_SIZE 0x00000010
 
 static struct resource corepll_params[] = {
 	[MLXBF_GIGE_VERSION_BF2] = {
@@ -78,6 +124,11 @@ static struct resource corepll_params[] = {
 		.end = MLXBF_GIGE_BF2_COREPLL_ADDR + MLXBF_GIGE_BF2_COREPLL_SIZE - 1,
 		.name = "COREPLL_RES"
 	},
+	[MLXBF_GIGE_VERSION_BF3] = {
+		.start = MLXBF_GIGE_BF3_COREPLL_ADDR,
+		.end = MLXBF_GIGE_BF3_COREPLL_ADDR + MLXBF_GIGE_BF3_COREPLL_SIZE - 1,
+		.name = "COREPLL_RES"
+	}
 };
 
 /* Returns core clock i1clk in Hz */
@@ -134,19 +185,23 @@ static u8 mdio_period_map(struct mlxbf_gige *priv)
 	return mdio_period;
 }
 
-static u32 mlxbf_gige_mdio_create_cmd(u16 data, int phy_add,
+static u32 mlxbf_gige_mdio_create_cmd(struct mlxbf_gige_mdio_gw *mdio_gw, u16 data, int phy_add,
 				      int phy_reg, u32 opcode)
 {
 	u32 gw_reg = 0;
 
-	gw_reg |= FIELD_PREP(MLXBF_GIGE_MDIO_GW_AD_MASK, data);
-	gw_reg |= FIELD_PREP(MLXBF_GIGE_MDIO_GW_DEVAD_MASK, phy_reg);
-	gw_reg |= FIELD_PREP(MLXBF_GIGE_MDIO_GW_PARTAD_MASK, phy_add);
-	gw_reg |= FIELD_PREP(MLXBF_GIGE_MDIO_GW_OPCODE_MASK, opcode);
-	gw_reg |= FIELD_PREP(MLXBF_GIGE_MDIO_GW_ST1_MASK,
-			     MLXBF_GIGE_MDIO_CL22_ST1);
-	gw_reg |= FIELD_PREP(MLXBF_GIGE_MDIO_GW_BUSY_MASK,
-			     MLXBF_GIGE_MDIO_SET_BUSY);
+	gw_reg |= ((data << mdio_gw->write_data.shift) &
+		   mdio_gw->write_data.mask);
+	gw_reg |= ((phy_reg << mdio_gw->devad.shift) &
+		   mdio_gw->devad.mask);
+	gw_reg |= ((phy_add << mdio_gw->partad.shift) &
+		   mdio_gw->partad.mask);
+	gw_reg |= ((opcode << mdio_gw->opcode.shift) &
+		   mdio_gw->opcode.mask);
+	gw_reg |= ((MLXBF_GIGE_MDIO_CL22_ST1 << mdio_gw->st1.shift) &
+		   mdio_gw->st1.mask);
+	gw_reg |= ((MLXBF_GIGE_MDIO_SET_BUSY << mdio_gw->busy.shift) &
+		   mdio_gw->busy.mask);
 
 	return gw_reg;
 }
@@ -162,25 +217,26 @@ static int mlxbf_gige_mdio_read(struct mii_bus *bus, int phy_add, int phy_reg)
 		return -EOPNOTSUPP;
 
 	/* Send mdio read request */
-	cmd = mlxbf_gige_mdio_create_cmd(0, phy_add, phy_reg, MLXBF_GIGE_MDIO_CL22_READ);
+	cmd = mlxbf_gige_mdio_create_cmd(priv->mdio_gw, 0, phy_add, phy_reg,
+					 MLXBF_GIGE_MDIO_CL22_READ);
 
-	writel(cmd, priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
+	writel(cmd, priv->mdio_io + priv->mdio_gw->gw_address);
 
-	ret = readl_poll_timeout_atomic(priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET,
-					val, !(val & MLXBF_GIGE_MDIO_GW_BUSY_MASK),
+	ret = readl_poll_timeout_atomic(priv->mdio_io + priv->mdio_gw->gw_address,
+					val, !(val & priv->mdio_gw->busy.mask),
 					5, 1000000);
 
 	if (ret) {
-		writel(0, priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
+		writel(0, priv->mdio_io + priv->mdio_gw->gw_address);
 		return ret;
 	}
 
-	ret = readl(priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
+	ret = readl(priv->mdio_io + priv->mdio_gw->read_data_address);
 	/* Only return ad bits of the gw register */
-	ret &= MLXBF_GIGE_MDIO_GW_AD_MASK;
+	ret &= priv->mdio_gw->read_data.mask;
 
 	/* The MDIO lock is set on read. To release it, clear gw register */
-	writel(0, priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
+	writel(0, priv->mdio_io + priv->mdio_gw->gw_address);
 
 	return ret;
 }
@@ -197,17 +253,17 @@ static int mlxbf_gige_mdio_write(struct mii_bus *bus, int phy_add,
 		return -EOPNOTSUPP;
 
 	/* Send mdio write request */
-	cmd = mlxbf_gige_mdio_create_cmd(val, phy_add, phy_reg,
+	cmd = mlxbf_gige_mdio_create_cmd(priv->mdio_gw, val, phy_add, phy_reg,
 					 MLXBF_GIGE_MDIO_CL22_WRITE);
-	writel(cmd, priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
+	writel(cmd, priv->mdio_io + priv->mdio_gw->gw_address);
 
 	/* If the poll timed out, drop the request */
-	ret = readl_poll_timeout_atomic(priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET,
-					temp, !(temp & MLXBF_GIGE_MDIO_GW_BUSY_MASK),
+	ret = readl_poll_timeout_atomic(priv->mdio_io + priv->mdio_gw->gw_address,
+					temp, !(temp & priv->mdio_gw->busy.mask),
 					5, 1000000);
 
 	/* The MDIO lock is set on read. To release it, clear gw register */
-	writel(0, priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
+	writel(0, priv->mdio_io + priv->mdio_gw->gw_address);
 
 	return ret;
 }
@@ -219,9 +275,20 @@ static void mlxbf_gige_mdio_cfg(struct mlxbf_gige *priv)
 
 	mdio_period = mdio_period_map(priv);
 
-	val = MLXBF_GIGE_MDIO_CFG_VAL;
-	val |= FIELD_PREP(MLXBF_GIGE_MDIO_CFG_MDC_PERIOD_MASK, mdio_period);
-	writel(val, priv->mdio_io + MLXBF_GIGE_MDIO_CFG_OFFSET);
+	if (priv->hw_version == MLXBF_GIGE_VERSION_BF2) {
+		val = MLXBF2_GIGE_MDIO_CFG_VAL;
+		val |= FIELD_PREP(MLXBF2_GIGE_MDIO_CFG_MDC_PERIOD_MASK, mdio_period);
+		writel(val, priv->mdio_io + MLXBF2_GIGE_MDIO_CFG_OFFSET);
+	} else {
+		val = FIELD_PREP(MLXBF3_GIGE_MDIO_CFG_MDIO_MODE_MASK, 1) |
+		      FIELD_PREP(MLXBF3_GIGE_MDIO_CFG_MDIO_FULL_DRIVE_MASK, 1);
+		writel(val, priv->mdio_io + MLXBF3_GIGE_MDIO_CFG_REG0);
+		val = FIELD_PREP(MLXBF3_GIGE_MDIO_CFG_MDC_PERIOD_MASK, mdio_period);
+		writel(val, priv->mdio_io + MLXBF3_GIGE_MDIO_CFG_REG1);
+		val = FIELD_PREP(MLXBF3_GIGE_MDIO_CFG_MDIO_IN_SAMP_MASK, 6) |
+		      FIELD_PREP(MLXBF3_GIGE_MDIO_CFG_MDIO_OUT_SAMP_MASK, 13);
+		writel(val, priv->mdio_io + MLXBF3_GIGE_MDIO_CFG_REG2);
+	}
 }
 
 int mlxbf_gige_mdio_probe(struct platform_device *pdev, struct mlxbf_gige *priv)
@@ -230,6 +297,9 @@ int mlxbf_gige_mdio_probe(struct platform_device *pdev, struct mlxbf_gige *priv)
 	struct resource *res;
 	int ret;
 
+	if (priv->hw_version > MLXBF_GIGE_VERSION_BF3)
+		return -ENODEV;
+
 	priv->mdio_io = devm_platform_ioremap_resource(pdev, MLXBF_GIGE_RES_MDIO9);
 	if (IS_ERR(priv->mdio_io))
 		return PTR_ERR(priv->mdio_io);
@@ -242,13 +312,15 @@ int mlxbf_gige_mdio_probe(struct platform_device *pdev, struct mlxbf_gige *priv)
 		/* For backward compatibility with older ACPI tables, also keep
 		 * CLK resource internal to the driver.
 		 */
-		res = &corepll_params[MLXBF_GIGE_VERSION_BF2];
+		res = &corepll_params[priv->hw_version];
 	}
 
 	priv->clk_io = devm_ioremap(dev, res->start, resource_size(res));
 	if (!priv->clk_io)
 		return -ENOMEM;
 
+	priv->mdio_gw = &mlxbf_gige_mdio_gw_t[priv->hw_version];
+
 	mlxbf_gige_mdio_cfg(priv);
 
 	priv->mdiobus = devm_mdiobus_alloc(dev);
diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio_bf2.h b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio_bf2.h
new file mode 100644
index 000000000000..7f1ff0ac7699
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio_bf2.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause */
+
+/* MDIO support for Mellanox Gigabit Ethernet driver
+ *
+ * Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES, ALL RIGHTS RESERVED.
+ *
+ * This software product is a proprietary product of NVIDIA CORPORATION &
+ * AFFILIATES (the "Company") and all right, title, and interest in and to the
+ * software product, including all associated intellectual property rights, are
+ * and shall remain exclusively with the Company.
+ *
+ * This software product is governed by the End User License Agreement
+ * provided with the software product.
+ */
+
+#ifndef __MLXBF_GIGE_MDIO_BF2_H__
+#define __MLXBF_GIGE_MDIO_BF2_H__
+
+#include <linux/bitfield.h>
+
+#define MLXBF2_GIGE_MDIO_GW_OFFSET	0x0
+#define MLXBF2_GIGE_MDIO_CFG_OFFSET	0x4
+
+/* MDIO GW register bits */
+#define MLXBF2_GIGE_MDIO_GW_AD_MASK	GENMASK(15, 0)
+#define MLXBF2_GIGE_MDIO_GW_DEVAD_MASK	GENMASK(20, 16)
+#define MLXBF2_GIGE_MDIO_GW_PARTAD_MASK	GENMASK(25, 21)
+#define MLXBF2_GIGE_MDIO_GW_OPCODE_MASK	GENMASK(27, 26)
+#define MLXBF2_GIGE_MDIO_GW_ST1_MASK	GENMASK(28, 28)
+#define MLXBF2_GIGE_MDIO_GW_BUSY_MASK	GENMASK(30, 30)
+
+#define MLXBF2_GIGE_MDIO_GW_AD_SHIFT     0
+#define MLXBF2_GIGE_MDIO_GW_DEVAD_SHIFT  16
+#define MLXBF2_GIGE_MDIO_GW_PARTAD_SHIFT 21
+#define MLXBF2_GIGE_MDIO_GW_OPCODE_SHIFT 26
+#define MLXBF2_GIGE_MDIO_GW_ST1_SHIFT    28
+#define MLXBF2_GIGE_MDIO_GW_BUSY_SHIFT   30
+
+/* MDIO config register bits */
+#define MLXBF2_GIGE_MDIO_CFG_MDIO_MODE_MASK		GENMASK(1, 0)
+#define MLXBF2_GIGE_MDIO_CFG_MDIO3_3_MASK		GENMASK(2, 2)
+#define MLXBF2_GIGE_MDIO_CFG_MDIO_FULL_DRIVE_MASK	GENMASK(4, 4)
+#define MLXBF2_GIGE_MDIO_CFG_MDC_PERIOD_MASK		GENMASK(15, 8)
+#define MLXBF2_GIGE_MDIO_CFG_MDIO_IN_SAMP_MASK		GENMASK(23, 16)
+#define MLXBF2_GIGE_MDIO_CFG_MDIO_OUT_SAMP_MASK		GENMASK(31, 24)
+
+#define MLXBF2_GIGE_MDIO_CFG_VAL (FIELD_PREP(MLXBF2_GIGE_MDIO_CFG_MDIO_MODE_MASK, 1) | \
+				 FIELD_PREP(MLXBF2_GIGE_MDIO_CFG_MDIO3_3_MASK, 1) | \
+				 FIELD_PREP(MLXBF2_GIGE_MDIO_CFG_MDIO_FULL_DRIVE_MASK, 1) | \
+				 FIELD_PREP(MLXBF2_GIGE_MDIO_CFG_MDIO_IN_SAMP_MASK, 6) | \
+				 FIELD_PREP(MLXBF2_GIGE_MDIO_CFG_MDIO_OUT_SAMP_MASK, 13))
+
+#endif /* __MLXBF_GIGE_MDIO_BF2_H__ */
diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio_bf3.h b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio_bf3.h
new file mode 100644
index 000000000000..9dd9144b9173
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio_bf3.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause */
+
+/* MDIO support for Mellanox Gigabit Ethernet driver
+ *
+ * Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES, ALL RIGHTS RESERVED.
+ *
+ * This software product is a proprietary product of NVIDIA CORPORATION &
+ * AFFILIATES (the "Company") and all right, title, and interest in and to the
+ * software product, including all associated intellectual property rights, are
+ * and shall remain exclusively with the Company.
+ *
+ * This software product is governed by the End User License Agreement
+ * provided with the software product.
+ */
+
+#ifndef __MLXBF_GIGE_MDIO_BF3_H__
+#define __MLXBF_GIGE_MDIO_BF3_H__
+
+#include <linux/bitfield.h>
+
+#define MLXBF3_GIGE_MDIO_GW_OFFSET	0x80
+#define MLXBF3_GIGE_MDIO_DATA_READ	0x8c
+#define MLXBF3_GIGE_MDIO_CFG_REG0	0x100
+#define MLXBF3_GIGE_MDIO_CFG_REG1	0x104
+#define MLXBF3_GIGE_MDIO_CFG_REG2	0x108
+
+/* MDIO GW register bits */
+#define MLXBF3_GIGE_MDIO_GW_ST1_MASK	GENMASK(1, 1)
+#define MLXBF3_GIGE_MDIO_GW_OPCODE_MASK	GENMASK(3, 2)
+#define MLXBF3_GIGE_MDIO_GW_PARTAD_MASK	GENMASK(8, 4)
+#define MLXBF3_GIGE_MDIO_GW_DEVAD_MASK	GENMASK(13, 9)
+/* For BlueField-3, this field is only used for mdio write */
+#define MLXBF3_GIGE_MDIO_GW_DATA_MASK	GENMASK(29, 14)
+#define MLXBF3_GIGE_MDIO_GW_BUSY_MASK	GENMASK(30, 30)
+
+#define MLXBF3_GIGE_MDIO_GW_DATA_READ_MASK GENMASK(15, 0)
+
+#define MLXBF3_GIGE_MDIO_GW_ST1_SHIFT    1
+#define MLXBF3_GIGE_MDIO_GW_OPCODE_SHIFT 2
+#define MLXBF3_GIGE_MDIO_GW_PARTAD_SHIFT 4
+#define MLXBF3_GIGE_MDIO_GW_DEVAD_SHIFT	 9
+#define MLXBF3_GIGE_MDIO_GW_DATA_SHIFT   14
+#define MLXBF3_GIGE_MDIO_GW_BUSY_SHIFT   30
+
+#define MLXBF3_GIGE_MDIO_GW_DATA_READ_SHIFT 0
+
+/* MDIO config register bits */
+#define MLXBF3_GIGE_MDIO_CFG_MDIO_MODE_MASK		GENMASK(1, 0)
+#define MLXBF3_GIGE_MDIO_CFG_MDIO_FULL_DRIVE_MASK	GENMASK(2, 2)
+#define MLXBF3_GIGE_MDIO_CFG_MDC_PERIOD_MASK		GENMASK(7, 0)
+#define MLXBF3_GIGE_MDIO_CFG_MDIO_IN_SAMP_MASK		GENMASK(7, 0)
+#define MLXBF3_GIGE_MDIO_CFG_MDIO_OUT_SAMP_MASK		GENMASK(15, 8)
+
+#endif /* __MLXBF_GIGE_MDIO_BF3_H__ */
diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_regs.h b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_regs.h
index 7be3a793984d..8d52dbef4adf 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_regs.h
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_regs.h
@@ -10,6 +10,7 @@
 
 #define MLXBF_GIGE_VERSION                            0x0000
 #define MLXBF_GIGE_VERSION_BF2                        0x0
+#define MLXBF_GIGE_VERSION_BF3                        0x1
 #define MLXBF_GIGE_STATUS                             0x0010
 #define MLXBF_GIGE_STATUS_READY                       BIT(0)
 #define MLXBF_GIGE_INT_STATUS                         0x0028