net: dwc_eth_qos: add Ethernet stm32mp1 support

Synopsys GMAC 4.20 is used. And Phy mode for eval and disco is RMII
with PHY Realtek RTL8211 (RGMII)
We also support some other PHY config on stm32mp157c
PHY_MODE	(MII,GMII, RMII, RGMII) and in normal,
PHY wo crystal (25Mhz and 50Mhz), No 125Mhz from PHY config

Signed-off-by: Christophe Roullier <christophe.roullier@st.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

1 files changed, 383 insertions, 52 deletions

diff --git a/drivers/net/dwc_eth_qos.c b/drivers/net/dwc_eth_qos.c
index 590e756..07b3667 100644
--- a/drivers/net/dwc_eth_qos.c
+++ b/drivers/net/dwc_eth_qos.c
@@ -26,7 +26,6 @@
  *    supports a single RGMII PHY. This configuration also has SW control over
  *    all clock and reset signals to the HW block.
  */
-
 #include <common.h>
 #include <clk.h>
 #include <dm.h>
@@ -95,6 +94,7 @@ struct eqos_mac_regs {
 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_MASK			3
 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_NOT_ENABLED		0
 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB		2
+#define EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_AV		1
 
 #define EQOS_MAC_RXQ_CTRL2_PSRQ0_SHIFT			0
 #define EQOS_MAC_RXQ_CTRL2_PSRQ0_MASK			0xff
@@ -108,6 +108,7 @@ struct eqos_mac_regs {
 #define EQOS_MAC_MDIO_ADDRESS_RDA_SHIFT			16
 #define EQOS_MAC_MDIO_ADDRESS_CR_SHIFT			8
 #define EQOS_MAC_MDIO_ADDRESS_CR_20_35			2
+#define EQOS_MAC_MDIO_ADDRESS_CR_250_300		5
 #define EQOS_MAC_MDIO_ADDRESS_SKAP			BIT(4)
 #define EQOS_MAC_MDIO_ADDRESS_GOC_SHIFT			2
 #define EQOS_MAC_MDIO_ADDRESS_GOC_READ			3
@@ -260,6 +261,29 @@ struct eqos_desc {
 
 struct eqos_config {
 	bool reg_access_always_ok;
+	int mdio_wait;
+	int swr_wait;
+	int config_mac;
+	int config_mac_mdio;
+	phy_interface_t (*interface)(struct udevice *dev);
+	struct eqos_ops *ops;
+};
+
+struct eqos_ops {
+	void (*eqos_inval_desc)(void *desc);
+	void (*eqos_flush_desc)(void *desc);
+	void (*eqos_inval_buffer)(void *buf, size_t size);
+	void (*eqos_flush_buffer)(void *buf, size_t size);
+	int (*eqos_probe_resources)(struct udevice *dev);
+	int (*eqos_remove_resources)(struct udevice *dev);
+	int (*eqos_stop_resets)(struct udevice *dev);
+	int (*eqos_start_resets)(struct udevice *dev);
+	void (*eqos_stop_clks)(struct udevice *dev);
+	int (*eqos_start_clks)(struct udevice *dev);
+	int (*eqos_calibrate_pads)(struct udevice *dev);
+	int (*eqos_disable_calibration)(struct udevice *dev);
+	int (*eqos_set_tx_clk_speed)(struct udevice *dev);
+	ulong (*eqos_get_tick_clk_rate)(struct udevice *dev);
 };
 
 struct eqos_priv {
@@ -276,6 +300,7 @@ struct eqos_priv {
 	struct clk clk_rx;
 	struct clk clk_ptp_ref;
 	struct clk clk_tx;
+	struct clk clk_ck;
 	struct clk clk_slave_bus;
 	struct mii_dev *mii;
 	struct phy_device *phy;
@@ -327,7 +352,7 @@ static void eqos_free_descs(void *descs)
 #endif
 }
 
-static void eqos_inval_desc(void *desc)
+static void eqos_inval_desc_tegra186(void *desc)
 {
 #ifndef CONFIG_SYS_NONCACHED_MEMORY
 	unsigned long start = (unsigned long)desc & ~(ARCH_DMA_MINALIGN - 1);
@@ -338,14 +363,36 @@ static void eqos_inval_desc(void *desc)
 #endif
 }
 
-static void eqos_flush_desc(void *desc)
+static void eqos_inval_desc_stm32(void *desc)
+{
+#ifndef CONFIG_SYS_NONCACHED_MEMORY
+	unsigned long start = rounddown((unsigned long)desc, ARCH_DMA_MINALIGN);
+	unsigned long end = roundup((unsigned long)desc + EQOS_DESCRIPTOR_SIZE,
+				    ARCH_DMA_MINALIGN);
+
+	invalidate_dcache_range(start, end);
+#endif
+}
+
+static void eqos_flush_desc_tegra186(void *desc)
 {
 #ifndef CONFIG_SYS_NONCACHED_MEMORY
 	flush_cache((unsigned long)desc, EQOS_DESCRIPTOR_SIZE);
 #endif
 }
 
-static void eqos_inval_buffer(void *buf, size_t size)
+static void eqos_flush_desc_stm32(void *desc)
+{
+#ifndef CONFIG_SYS_NONCACHED_MEMORY
+	unsigned long start = rounddown((unsigned long)desc, ARCH_DMA_MINALIGN);
+	unsigned long end = roundup((unsigned long)desc + EQOS_DESCRIPTOR_SIZE,
+				    ARCH_DMA_MINALIGN);
+
+	flush_dcache_range(start, end);
+#endif
+}
+
+static void eqos_inval_buffer_tegra186(void *buf, size_t size)
 {
 	unsigned long start = (unsigned long)buf & ~(ARCH_DMA_MINALIGN - 1);
 	unsigned long end = ALIGN(start + size, ARCH_DMA_MINALIGN);
@@ -353,11 +400,29 @@ static void eqos_inval_buffer(void *buf, size_t size)
 	invalidate_dcache_range(start, end);
 }
 
-static void eqos_flush_buffer(void *buf, size_t size)
+static void eqos_inval_buffer_stm32(void *buf, size_t size)
+{
+	unsigned long start = rounddown((unsigned long)buf, ARCH_DMA_MINALIGN);
+	unsigned long end = roundup((unsigned long)buf + size,
+				    ARCH_DMA_MINALIGN);
+
+	invalidate_dcache_range(start, end);
+}
+
+static void eqos_flush_buffer_tegra186(void *buf, size_t size)
 {
 	flush_cache((unsigned long)buf, size);
 }
 
+static void eqos_flush_buffer_stm32(void *buf, size_t size)
+{
+	unsigned long start = rounddown((unsigned long)buf, ARCH_DMA_MINALIGN);
+	unsigned long end = roundup((unsigned long)buf + size,
+				    ARCH_DMA_MINALIGN);
+
+	flush_dcache_range(start, end);
+}
+
 static int eqos_mdio_wait_idle(struct eqos_priv *eqos)
 {
 	return wait_for_bit_le32(&eqos->mac_regs->mdio_address,
@@ -386,14 +451,14 @@ static int eqos_mdio_read(struct mii_dev *bus, int mdio_addr, int mdio_devad,
 		EQOS_MAC_MDIO_ADDRESS_C45E;
 	val |= (mdio_addr << EQOS_MAC_MDIO_ADDRESS_PA_SHIFT) |
 		(mdio_reg << EQOS_MAC_MDIO_ADDRESS_RDA_SHIFT) |
-		(EQOS_MAC_MDIO_ADDRESS_CR_20_35 <<
+		(eqos->config->config_mac_mdio <<
 		 EQOS_MAC_MDIO_ADDRESS_CR_SHIFT) |
 		(EQOS_MAC_MDIO_ADDRESS_GOC_READ <<
 		 EQOS_MAC_MDIO_ADDRESS_GOC_SHIFT) |
 		EQOS_MAC_MDIO_ADDRESS_GB;
 	writel(val, &eqos->mac_regs->mdio_address);
 
-	udelay(10);
+	udelay(eqos->config->mdio_wait);
 
 	ret = eqos_mdio_wait_idle(eqos);
 	if (ret) {
@@ -432,14 +497,14 @@ static int eqos_mdio_write(struct mii_dev *bus, int mdio_addr, int mdio_devad,
 		EQOS_MAC_MDIO_ADDRESS_C45E;
 	val |= (mdio_addr << EQOS_MAC_MDIO_ADDRESS_PA_SHIFT) |
 		(mdio_reg << EQOS_MAC_MDIO_ADDRESS_RDA_SHIFT) |
-		(EQOS_MAC_MDIO_ADDRESS_CR_20_35 <<
+		(eqos->config->config_mac_mdio <<
 		 EQOS_MAC_MDIO_ADDRESS_CR_SHIFT) |
 		(EQOS_MAC_MDIO_ADDRESS_GOC_WRITE <<
 		 EQOS_MAC_MDIO_ADDRESS_GOC_SHIFT) |
 		EQOS_MAC_MDIO_ADDRESS_GB;
 	writel(val, &eqos->mac_regs->mdio_address);
 
-	udelay(10);
+	udelay(eqos->config->mdio_wait);
 
 	ret = eqos_mdio_wait_idle(eqos);
 	if (ret) {
@@ -509,6 +574,53 @@ err:
 	return ret;
 }
 
+static int eqos_start_clks_stm32(struct udevice *dev)
+{
+	struct eqos_priv *eqos = dev_get_priv(dev);
+	int ret;
+
+	debug("%s(dev=%p):\n", __func__, dev);
+
+	ret = clk_enable(&eqos->clk_master_bus);
+	if (ret < 0) {
+		pr_err("clk_enable(clk_master_bus) failed: %d", ret);
+		goto err;
+	}
+
+	ret = clk_enable(&eqos->clk_rx);
+	if (ret < 0) {
+		pr_err("clk_enable(clk_rx) failed: %d", ret);
+		goto err_disable_clk_master_bus;
+	}
+
+	ret = clk_enable(&eqos->clk_tx);
+	if (ret < 0) {
+		pr_err("clk_enable(clk_tx) failed: %d", ret);
+		goto err_disable_clk_rx;
+	}
+
+	if (clk_valid(&eqos->clk_ck)) {
+		ret = clk_enable(&eqos->clk_ck);
+		if (ret < 0) {
+			pr_err("clk_enable(clk_ck) failed: %d", ret);
+			goto err_disable_clk_tx;
+		}
+	}
+
+	debug("%s: OK\n", __func__);
+	return 0;
+
+err_disable_clk_tx:
+	clk_disable(&eqos->clk_tx);
+err_disable_clk_rx:
+	clk_disable(&eqos->clk_rx);
+err_disable_clk_master_bus:
+	clk_disable(&eqos->clk_master_bus);
+err:
+	debug("%s: FAILED: %d\n", __func__, ret);
+	return ret;
+}
+
 void eqos_stop_clks_tegra186(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -524,6 +636,21 @@ void eqos_stop_clks_tegra186(struct udevice *dev)
 	debug("%s: OK\n", __func__);
 }
 
+void eqos_stop_clks_stm32(struct udevice *dev)
+{
+	struct eqos_priv *eqos = dev_get_priv(dev);
+
+	debug("%s(dev=%p):\n", __func__, dev);
+
+	clk_disable(&eqos->clk_tx);
+	clk_disable(&eqos->clk_rx);
+	clk_disable(&eqos->clk_master_bus);
+	if (clk_valid(&eqos->clk_ck))
+		clk_disable(&eqos->clk_ck);
+
+	debug("%s: OK\n", __func__);
+}
+
 static int eqos_start_resets_tegra186(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -563,6 +690,11 @@ static int eqos_start_resets_tegra186(struct udevice *dev)
 	return 0;
 }
 
+static int eqos_start_resets_stm32(struct udevice *dev)
+{
+	return 0;
+}
+
 static int eqos_stop_resets_tegra186(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -573,6 +705,11 @@ static int eqos_stop_resets_tegra186(struct udevice *dev)
 	return 0;
 }
 
+static int eqos_stop_resets_stm32(struct udevice *dev)
+{
+	return 0;
+}
+
 static int eqos_calibrate_pads_tegra186(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -632,6 +769,23 @@ static ulong eqos_get_tick_clk_rate_tegra186(struct udevice *dev)
 	return clk_get_rate(&eqos->clk_slave_bus);
 }
 
+static ulong eqos_get_tick_clk_rate_stm32(struct udevice *dev)
+{
+	struct eqos_priv *eqos = dev_get_priv(dev);
+
+	return clk_get_rate(&eqos->clk_master_bus);
+}
+
+static int eqos_calibrate_pads_stm32(struct udevice *dev)
+{
+	return 0;
+}
+
+static int eqos_disable_calibration_stm32(struct udevice *dev)
+{
+	return 0;
+}
+
 static int eqos_set_full_duplex(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -726,6 +880,11 @@ static int eqos_set_tx_clk_speed_tegra186(struct udevice *dev)
 	return 0;
 }
 
+static int eqos_set_tx_clk_speed_stm32(struct udevice *dev)
+{
+	return 0;
+}
+
 static int eqos_adjust_link(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -766,23 +925,23 @@ static int eqos_adjust_link(struct udevice *dev)
 	}
 
 	if (en_calibration) {
-		ret = eqos_calibrate_pads_tegra186(dev);
+		ret = eqos->config->ops->eqos_calibrate_pads(dev);
 		if (ret < 0) {
-			pr_err("eqos_calibrate_pads_tegra186() failed: %d", ret);
+			pr_err("eqos_calibrate_pads() failed: %d",
+			       ret);
 			return ret;
 		}
 	} else {
-		ret = eqos_disable_calibration_tegra186(dev);
+		ret = eqos->config->ops->eqos_disable_calibration(dev);
 		if (ret < 0) {
-			pr_err("eqos_disable_calibration_tegra186() failed: %d",
-			      ret);
+			pr_err("eqos_disable_calibration() failed: %d",
+			       ret);
 			return ret;
 		}
 	}
-
-	ret = eqos_set_tx_clk_speed_tegra186(dev);
+	ret = eqos->config->ops->eqos_set_tx_clk_speed(dev);
 	if (ret < 0) {
-		pr_err("eqos_set_tx_clk_speed_tegra186() failed: %d", ret);
+		pr_err("eqos_set_tx_clk_speed() failed: %d", ret);
 		return ret;
 	}
 
@@ -846,15 +1005,15 @@ static int eqos_start(struct udevice *dev)
 	eqos->tx_desc_idx = 0;
 	eqos->rx_desc_idx = 0;
 
-	ret = eqos_start_clks_tegra186(dev);
+	ret = eqos->config->ops->eqos_start_clks(dev);
 	if (ret < 0) {
-		pr_err("eqos_start_clks_tegra186() failed: %d", ret);
+		pr_err("eqos_start_clks() failed: %d", ret);
 		goto err;
 	}
 
-	ret = eqos_start_resets_tegra186(dev);
+	ret = eqos->config->ops->eqos_start_resets(dev);
 	if (ret < 0) {
-		pr_err("eqos_start_resets_tegra186() failed: %d", ret);
+		pr_err("eqos_start_resets() failed: %d", ret);
 		goto err_stop_clks;
 	}
 
@@ -863,32 +1022,41 @@ static int eqos_start(struct udevice *dev)
 	eqos->reg_access_ok = true;
 
 	ret = wait_for_bit_le32(&eqos->dma_regs->mode,
-				EQOS_DMA_MODE_SWR, false, 10, false);
+				EQOS_DMA_MODE_SWR, false,
+				eqos->config->swr_wait, false);
 	if (ret) {
 		pr_err("EQOS_DMA_MODE_SWR stuck");
 		goto err_stop_resets;
 	}
 
-	ret = eqos_calibrate_pads_tegra186(dev);
+	ret = eqos->config->ops->eqos_calibrate_pads(dev);
 	if (ret < 0) {
-		pr_err("eqos_calibrate_pads_tegra186() failed: %d", ret);
+		pr_err("eqos_calibrate_pads() failed: %d", ret);
 		goto err_stop_resets;
 	}
+	rate = eqos->config->ops->eqos_get_tick_clk_rate(dev);
 
-	rate = eqos_get_tick_clk_rate_tegra186(dev);
 	val = (rate / 1000000) - 1;
 	writel(val, &eqos->mac_regs->us_tic_counter);
 
-	eqos->phy = phy_connect(eqos->mii, 0, dev, 0);
+	/*
+	 * if PHY was already connected and configured,
+	 * don't need to reconnect/reconfigure again
+	 */
 	if (!eqos->phy) {
-		pr_err("phy_connect() failed");
-		goto err_stop_resets;
-	}
-	ret = phy_config(eqos->phy);
-	if (ret < 0) {
-		pr_err("phy_config() failed: %d", ret);
-		goto err_shutdown_phy;
+		eqos->phy = phy_connect(eqos->mii, 0, dev,
+					eqos->config->interface(dev));
+		if (!eqos->phy) {
+			pr_err("phy_connect() failed");
+			goto err_stop_resets;
+		}
+		ret = phy_config(eqos->phy);
+		if (ret < 0) {
+			pr_err("phy_config() failed: %d", ret);
+			goto err_shutdown_phy;
+		}
 	}
+
 	ret = phy_startup(eqos->phy);
 	if (ret < 0) {
 		pr_err("phy_startup() failed: %d", ret);
@@ -993,7 +1161,7 @@ static int eqos_start(struct udevice *dev)
 	clrsetbits_le32(&eqos->mac_regs->rxq_ctrl0,
 			EQOS_MAC_RXQ_CTRL0_RXQ0EN_MASK <<
 			EQOS_MAC_RXQ_CTRL0_RXQ0EN_SHIFT,
-			EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB <<
+			eqos->config->config_mac <<
 			EQOS_MAC_RXQ_CTRL0_RXQ0EN_SHIFT);
 
 	/* Set TX flow control parameters */
@@ -1074,7 +1242,7 @@ static int eqos_start(struct udevice *dev)
 					     (i * EQOS_MAX_PACKET_SIZE));
 		rx_desc->des3 |= EQOS_DESC3_OWN | EQOS_DESC3_BUF1V;
 	}
-	flush_cache((unsigned long)eqos->descs, EQOS_DESCRIPTORS_SIZE);
+	eqos->config->ops->eqos_flush_desc(eqos->descs);
 
 	writel(0, &eqos->dma_regs->ch0_txdesc_list_haddress);
 	writel((ulong)eqos->tx_descs, &eqos->dma_regs->ch0_txdesc_list_address);
@@ -1113,11 +1281,10 @@ static int eqos_start(struct udevice *dev)
 
 err_shutdown_phy:
 	phy_shutdown(eqos->phy);
-	eqos->phy = NULL;
 err_stop_resets:
-	eqos_stop_resets_tegra186(dev);
+	eqos->config->ops->eqos_stop_resets(dev);
 err_stop_clks:
-	eqos_stop_clks_tegra186(dev);
+	eqos->config->ops->eqos_stop_clks(dev);
 err:
 	pr_err("FAILED: %d", ret);
 	return ret;
@@ -1170,10 +1337,9 @@ void eqos_stop(struct udevice *dev)
 
 	if (eqos->phy) {
 		phy_shutdown(eqos->phy);
-		eqos->phy = NULL;
 	}
-	eqos_stop_resets_tegra186(dev);
-	eqos_stop_clks_tegra186(dev);
+	eqos->config->ops->eqos_stop_resets(dev);
+	eqos->config->ops->eqos_stop_clks(dev);
 
 	debug("%s: OK\n", __func__);
 }
@@ -1188,7 +1354,7 @@ int eqos_send(struct udevice *dev, void *packet, int length)
 	      length);
 
 	memcpy(eqos->tx_dma_buf, packet, length);
-	eqos_flush_buffer(eqos->tx_dma_buf, length);
+	eqos->config->ops->eqos_flush_buffer(eqos->tx_dma_buf, length);
 
 	tx_desc = &(eqos->tx_descs[eqos->tx_desc_idx]);
 	eqos->tx_desc_idx++;
@@ -1203,12 +1369,12 @@ int eqos_send(struct udevice *dev, void *packet, int length)
 	 */
 	mb();
 	tx_desc->des3 = EQOS_DESC3_OWN | EQOS_DESC3_FD | EQOS_DESC3_LD | length;
-	eqos_flush_desc(tx_desc);
+	eqos->config->ops->eqos_flush_desc(tx_desc);
 
 	writel((ulong)(tx_desc + 1), &eqos->dma_regs->ch0_txdesc_tail_pointer);
 
 	for (i = 0; i < 1000000; i++) {
-		eqos_inval_desc(tx_desc);
+		eqos->config->ops->eqos_inval_desc(tx_desc);
 		if (!(readl(&tx_desc->des3) & EQOS_DESC3_OWN))
 			return 0;
 		udelay(1);
@@ -1238,7 +1404,7 @@ int eqos_recv(struct udevice *dev, int flags, uchar **packetp)
 	length = rx_desc->des3 & 0x7fff;
 	debug("%s: *packetp=%p, length=%d\n", __func__, *packetp, length);
 
-	eqos_inval_buffer(*packetp, length);
+	eqos->config->ops->eqos_inval_buffer(*packetp, length);
 
 	return length;
 }
@@ -1269,7 +1435,7 @@ int eqos_free_pkt(struct udevice *dev, uchar *packet, int length)
 	 */
 	mb();
 	rx_desc->des3 |= EQOS_DESC3_OWN | EQOS_DESC3_BUF1V;
-	eqos_flush_desc(rx_desc);
+	eqos->config->ops->eqos_flush_desc(rx_desc);
 
 	writel((ulong)rx_desc, &eqos->dma_regs->ch0_rxdesc_tail_pointer);
 
@@ -1304,7 +1470,7 @@ static int eqos_probe_resources_core(struct udevice *dev)
 		ret = -ENOMEM;
 		goto err_free_descs;
 	}
-	debug("%s: rx_dma_buf=%p\n", __func__, eqos->rx_dma_buf);
+	debug("%s: tx_dma_buf=%p\n", __func__, eqos->tx_dma_buf);
 
 	eqos->rx_dma_buf = memalign(EQOS_BUFFER_ALIGN, EQOS_RX_BUFFER_SIZE);
 	if (!eqos->rx_dma_buf) {
@@ -1312,7 +1478,7 @@ static int eqos_probe_resources_core(struct udevice *dev)
 		ret = -ENOMEM;
 		goto err_free_tx_dma_buf;
 	}
-	debug("%s: tx_dma_buf=%p\n", __func__, eqos->tx_dma_buf);
+	debug("%s: rx_dma_buf=%p\n", __func__, eqos->rx_dma_buf);
 
 	eqos->rx_pkt = malloc(EQOS_MAX_PACKET_SIZE);
 	if (!eqos->rx_pkt) {
@@ -1424,6 +1590,98 @@ err_free_reset_eqos:
 	return ret;
 }
 
+/* board-specific Ethernet Interface initializations. */
+__weak int board_interface_eth_init(int interface_type, bool eth_clk_sel_reg,
+				    bool eth_ref_clk_sel_reg)
+{
+	return 0;
+}
+
+static int eqos_probe_resources_stm32(struct udevice *dev)
+{
+	struct eqos_priv *eqos = dev_get_priv(dev);
+	int ret;
+	phy_interface_t interface;
+	bool eth_clk_sel_reg = false;
+	bool eth_ref_clk_sel_reg = false;
+
+	debug("%s(dev=%p):\n", __func__, dev);
+
+	interface = eqos->config->interface(dev);
+
+	if (interface == PHY_INTERFACE_MODE_NONE) {
+		pr_err("Invalid PHY interface\n");
+		return -EINVAL;
+	}
+
+	/* Gigabit Ethernet 125MHz clock selection. */
+	eth_clk_sel_reg = dev_read_bool(dev, "st,eth_clk_sel");
+
+	/* Ethernet 50Mhz RMII clock selection */
+	eth_ref_clk_sel_reg =
+		dev_read_bool(dev, "st,eth_ref_clk_sel");
+
+	ret = board_interface_eth_init(interface, eth_clk_sel_reg,
+				       eth_ref_clk_sel_reg);
+	if (ret)
+		return -EINVAL;
+
+	ret = clk_get_by_name(dev, "stmmaceth", &eqos->clk_master_bus);
+	if (ret) {
+		pr_err("clk_get_by_name(master_bus) failed: %d", ret);
+		goto err_probe;
+	}
+
+	ret = clk_get_by_name(dev, "mac-clk-rx", &eqos->clk_rx);
+	if (ret) {
+		pr_err("clk_get_by_name(rx) failed: %d", ret);
+		goto err_free_clk_master_bus;
+	}
+
+	ret = clk_get_by_name(dev, "mac-clk-tx", &eqos->clk_tx);
+	if (ret) {
+		pr_err("clk_get_by_name(tx) failed: %d", ret);
+		goto err_free_clk_rx;
+	}
+
+	/*  Get ETH_CLK clocks (optional) */
+	ret = clk_get_by_name(dev, "eth-ck", &eqos->clk_ck);
+	if (ret)
+		pr_warn("No phy clock provided %d", ret);
+
+	debug("%s: OK\n", __func__);
+	return 0;
+
+err_free_clk_rx:
+	clk_free(&eqos->clk_rx);
+err_free_clk_master_bus:
+	clk_free(&eqos->clk_master_bus);
+err_probe:
+
+	debug("%s: returns %d\n", __func__, ret);
+	return ret;
+}
+
+static phy_interface_t eqos_get_interface_stm32(struct udevice *dev)
+{
+	const char *phy_mode;
+	phy_interface_t interface = PHY_INTERFACE_MODE_NONE;
+
+	debug("%s(dev=%p):\n", __func__, dev);
+
+	phy_mode = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "phy-mode",
+			       NULL);
+	if (phy_mode)
+		interface = phy_get_interface_by_name(phy_mode);
+
+	return interface;
+}
+
+static phy_interface_t eqos_get_interface_tegra186(struct udevice *dev)
+{
+	return PHY_INTERFACE_MODE_MII;
+}
+
 static int eqos_remove_resources_tegra186(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -1442,6 +1700,22 @@ static int eqos_remove_resources_tegra186(struct udevice *dev)
 	return 0;
 }
 
+static int eqos_remove_resources_stm32(struct udevice *dev)
+{
+	struct eqos_priv *eqos = dev_get_priv(dev);
+
+	debug("%s(dev=%p):\n", __func__, dev);
+
+	clk_free(&eqos->clk_tx);
+	clk_free(&eqos->clk_rx);
+	clk_free(&eqos->clk_master_bus);
+	if (clk_valid(&eqos->clk_ck))
+		clk_free(&eqos->clk_ck);
+
+	debug("%s: OK\n", __func__);
+	return 0;
+}
+
 static int eqos_probe(struct udevice *dev)
 {
 	struct eqos_priv *eqos = dev_get_priv(dev);
@@ -1468,15 +1742,16 @@ static int eqos_probe(struct udevice *dev)
 		return ret;
 	}
 
-	ret = eqos_probe_resources_tegra186(dev);
+	ret = eqos->config->ops->eqos_probe_resources(dev);
 	if (ret < 0) {
-		pr_err("eqos_probe_resources_tegra186() failed: %d", ret);
+		pr_err("eqos_probe_resources() failed: %d", ret);
 		goto err_remove_resources_core;
 	}
 
 	eqos->mii = mdio_alloc();
 	if (!eqos->mii) {
 		pr_err("mdio_alloc() failed");
+		ret = -ENOMEM;
 		goto err_remove_resources_tegra;
 	}
 	eqos->mii->read = eqos_mdio_read;
@@ -1496,7 +1771,7 @@ static int eqos_probe(struct udevice *dev)
 err_free_mdio:
 	mdio_free(eqos->mii);
 err_remove_resources_tegra:
-	eqos_remove_resources_tegra186(dev);
+	eqos->config->ops->eqos_remove_resources(dev);
 err_remove_resources_core:
 	eqos_remove_resources_core(dev);
 
@@ -1512,7 +1787,8 @@ static int eqos_remove(struct udevice *dev)
 
 	mdio_unregister(eqos->mii);
 	mdio_free(eqos->mii);
-	eqos_remove_resources_tegra186(dev);
+	eqos->config->ops->eqos_remove_resources(dev);
+
 	eqos_probe_resources_core(dev);
 
 	debug("%s: OK\n", __func__);
@@ -1528,8 +1804,58 @@ static const struct eth_ops eqos_ops = {
 	.write_hwaddr = eqos_write_hwaddr,
 };
 
+static struct eqos_ops eqos_tegra186_ops = {
+	.eqos_inval_desc = eqos_inval_desc_tegra186,
+	.eqos_flush_desc = eqos_flush_desc_tegra186,
+	.eqos_inval_buffer = eqos_inval_buffer_tegra186,
+	.eqos_flush_buffer = eqos_flush_buffer_tegra186,
+	.eqos_probe_resources = eqos_probe_resources_tegra186,
+	.eqos_remove_resources = eqos_remove_resources_tegra186,
+	.eqos_stop_resets = eqos_stop_resets_tegra186,
+	.eqos_start_resets = eqos_start_resets_tegra186,
+	.eqos_stop_clks = eqos_stop_clks_tegra186,
+	.eqos_start_clks = eqos_start_clks_tegra186,
+	.eqos_calibrate_pads = eqos_calibrate_pads_tegra186,
+	.eqos_disable_calibration = eqos_disable_calibration_tegra186,
+	.eqos_set_tx_clk_speed = eqos_set_tx_clk_speed_tegra186,
+	.eqos_get_tick_clk_rate = eqos_get_tick_clk_rate_tegra186
+};
+
 static const struct eqos_config eqos_tegra186_config = {
 	.reg_access_always_ok = false,
+	.mdio_wait = 10,
+	.swr_wait = 10,
+	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB,
+	.config_mac_mdio = EQOS_MAC_MDIO_ADDRESS_CR_20_35,
+	.interface = eqos_get_interface_tegra186,
+	.ops = &eqos_tegra186_ops
+};
+
+static struct eqos_ops eqos_stm32_ops = {
+	.eqos_inval_desc = eqos_inval_desc_stm32,
+	.eqos_flush_desc = eqos_flush_desc_stm32,
+	.eqos_inval_buffer = eqos_inval_buffer_stm32,
+	.eqos_flush_buffer = eqos_flush_buffer_stm32,
+	.eqos_probe_resources = eqos_probe_resources_stm32,
+	.eqos_remove_resources = eqos_remove_resources_stm32,
+	.eqos_stop_resets = eqos_stop_resets_stm32,
+	.eqos_start_resets = eqos_start_resets_stm32,
+	.eqos_stop_clks = eqos_stop_clks_stm32,
+	.eqos_start_clks = eqos_start_clks_stm32,
+	.eqos_calibrate_pads = eqos_calibrate_pads_stm32,
+	.eqos_disable_calibration = eqos_disable_calibration_stm32,
+	.eqos_set_tx_clk_speed = eqos_set_tx_clk_speed_stm32,
+	.eqos_get_tick_clk_rate = eqos_get_tick_clk_rate_stm32
+};
+
+static const struct eqos_config eqos_stm32_config = {
+	.reg_access_always_ok = false,
+	.mdio_wait = 10000,
+	.swr_wait = 50,
+	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_AV,
+	.config_mac_mdio = EQOS_MAC_MDIO_ADDRESS_CR_250_300,
+	.interface = eqos_get_interface_stm32,
+	.ops = &eqos_stm32_ops
 };
 
 static const struct udevice_id eqos_ids[] = {
@@ -1537,6 +1863,11 @@ static const struct udevice_id eqos_ids[] = {
 		.compatible = "nvidia,tegra186-eqos",
 		.data = (ulong)&eqos_tegra186_config
 	},
+	{
+		.compatible = "snps,dwmac-4.20a",
+		.data = (ulong)&eqos_stm32_config
+	},
+
 	{ }
 };