net: Add EMAC driver for H3/A83T/A64 SoCs.

This patch add EMAC driver support for H3/A83T/A64 SoCs.
Tested on Pine64(A64-External PHY) and Orangepipc(H3-Internal PHY).

BIG Thanks to Andre for providing some of the DT code.

Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 789 insertions, 0 deletions

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
new file mode 100644
index 0000000000..4bed50d668
--- /dev/null
+++ b/drivers/net/sun8i_emac.c
@@ -0,0 +1,789 @@
+/*
+ * (C) Copyright 2016
+ * Author: Amit Singh Tomar, amittomer25@gmail.com
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ *
+ * Ethernet driver for H3/A64/A83T based SoC's
+ *
+ * It is derived from the work done by
+ * LABBE Corentin & Chen-Yu Tsai for Linux, THANKS!
+ *
+*/
+
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/gpio.h>
+#include <common.h>
+#include <dm.h>
+#include <fdt_support.h>
+#include <linux/err.h>
+#include <malloc.h>
+#include <miiphy.h>
+#include <net.h>
+
+#define SCTL_EMAC_TX_CLK_SRC_MII	BIT(0)
+#define SCTL_EMAC_EPIT_MII		BIT(2)
+#define SCTL_EMAC_CLK_SEL		BIT(18) /* 25 Mhz */
+
+#define MDIO_CMD_MII_BUSY		BIT(0)
+#define MDIO_CMD_MII_WRITE		BIT(1)
+
+#define MDIO_CMD_MII_PHY_REG_ADDR_MASK	0x000001f0
+#define MDIO_CMD_MII_PHY_REG_ADDR_SHIFT	4
+#define MDIO_CMD_MII_PHY_ADDR_MASK	0x0001f000
+#define MDIO_CMD_MII_PHY_ADDR_SHIFT	12
+
+#define CONFIG_TX_DESCR_NUM	32
+#define CONFIG_RX_DESCR_NUM	32
+#define CONFIG_ETH_BUFSIZE	2024
+
+#define TX_TOTAL_BUFSIZE	(CONFIG_ETH_BUFSIZE * CONFIG_TX_DESCR_NUM)
+#define RX_TOTAL_BUFSIZE	(CONFIG_ETH_BUFSIZE * CONFIG_RX_DESCR_NUM)
+
+#define H3_EPHY_DEFAULT_VALUE	0x58000
+#define H3_EPHY_DEFAULT_MASK	GENMASK(31, 15)
+#define H3_EPHY_ADDR_SHIFT	20
+#define REG_PHY_ADDR_MASK	GENMASK(4, 0)
+#define H3_EPHY_LED_POL		BIT(17)	/* 1: active low, 0: active high */
+#define H3_EPHY_SHUTDOWN	BIT(16)	/* 1: shutdown, 0: power up */
+#define H3_EPHY_SELECT		BIT(15) /* 1: internal PHY, 0: external PHY */
+
+#define SC_RMII_EN		BIT(13)
+#define SC_EPIT			BIT(2) /* 1: RGMII, 0: MII */
+#define SC_ETCS_MASK		GENMASK(1, 0)
+#define SC_ETCS_EXT_GMII	0x1
+#define SC_ETCS_INT_GMII	0x2
+
+#define CONFIG_MDIO_TIMEOUT	(3 * CONFIG_SYS_HZ)
+
+#define AHB_GATE_OFFSET_EPHY	0
+
+#if defined(CONFIG_MACH_SUN8I_H3)
+#define SUN8I_GPD8_GMAC		2
+#else
+#define SUN8I_GPD8_GMAC		4
+#endif
+
+/* H3/A64 EMAC Register's offset */
+#define EMAC_CTL0		0x00
+#define EMAC_CTL1		0x04
+#define EMAC_INT_STA		0x08
+#define EMAC_INT_EN		0x0c
+#define EMAC_TX_CTL0		0x10
+#define EMAC_TX_CTL1		0x14
+#define EMAC_TX_FLOW_CTL	0x1c
+#define EMAC_TX_DMA_DESC	0x20
+#define EMAC_RX_CTL0		0x24
+#define EMAC_RX_CTL1		0x28
+#define EMAC_RX_DMA_DESC	0x34
+#define EMAC_MII_CMD		0x48
+#define EMAC_MII_DATA		0x4c
+#define EMAC_ADDR0_HIGH		0x50
+#define EMAC_ADDR0_LOW		0x54
+#define EMAC_TX_DMA_STA		0xb0
+#define EMAC_TX_CUR_DESC	0xb4
+#define EMAC_TX_CUR_BUF		0xb8
+#define EMAC_RX_DMA_STA		0xc0
+#define EMAC_RX_CUR_DESC	0xc4
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum emac_variant {
+	A83T_EMAC = 1,
+	H3_EMAC,
+	A64_EMAC,
+};
+
+struct emac_dma_desc {
+	u32 status;
+	u32 st;
+	u32 buf_addr;
+	u32 next;
+} __aligned(ARCH_DMA_MINALIGN);
+
+struct emac_eth_dev {
+	struct emac_dma_desc rx_chain[CONFIG_TX_DESCR_NUM];
+	struct emac_dma_desc tx_chain[CONFIG_RX_DESCR_NUM];
+	char rxbuffer[RX_TOTAL_BUFSIZE] __aligned(ARCH_DMA_MINALIGN);
+	char txbuffer[TX_TOTAL_BUFSIZE] __aligned(ARCH_DMA_MINALIGN);
+
+	u32 interface;
+	u32 phyaddr;
+	u32 link;
+	u32 speed;
+	u32 duplex;
+	u32 phy_configured;
+	u32 tx_currdescnum;
+	u32 rx_currdescnum;
+	u32 addr;
+	u32 tx_slot;
+	bool use_internal_phy;
+
+	enum emac_variant variant;
+	void *mac_reg;
+	phys_addr_t sysctl_reg;
+	struct phy_device *phydev;
+	struct mii_dev *bus;
+};
+
+static int sun8i_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
+{
+	struct emac_eth_dev *priv = bus->priv;
+	ulong start;
+	u32 miiaddr = 0;
+	int timeout = CONFIG_MDIO_TIMEOUT;
+
+	miiaddr &= ~MDIO_CMD_MII_WRITE;
+	miiaddr &= ~MDIO_CMD_MII_PHY_REG_ADDR_MASK;
+	miiaddr |= (reg << MDIO_CMD_MII_PHY_REG_ADDR_SHIFT) &
+		MDIO_CMD_MII_PHY_REG_ADDR_MASK;
+
+	miiaddr &= ~MDIO_CMD_MII_PHY_ADDR_MASK;
+
+	miiaddr |= (addr << MDIO_CMD_MII_PHY_ADDR_SHIFT) &
+		MDIO_CMD_MII_PHY_ADDR_MASK;
+
+	miiaddr |= MDIO_CMD_MII_BUSY;
+
+	writel(miiaddr, priv->mac_reg + EMAC_MII_CMD);
+
+	start = get_timer(0);
+	while (get_timer(start) < timeout) {
+		if (!(readl(priv->mac_reg + EMAC_MII_CMD) & MDIO_CMD_MII_BUSY))
+			return readl(priv->mac_reg + EMAC_MII_DATA);
+		udelay(10);
+	};
+
+	return -1;
+}
+
+static int sun8i_mdio_write(struct mii_dev *bus, int addr, int devad, int reg,
+			    u16 val)
+{
+	struct emac_eth_dev *priv = bus->priv;
+	ulong start;
+	u32 miiaddr = 0;
+	int ret = -1, timeout = CONFIG_MDIO_TIMEOUT;
+
+	miiaddr &= ~MDIO_CMD_MII_PHY_REG_ADDR_MASK;
+	miiaddr |= (reg << MDIO_CMD_MII_PHY_REG_ADDR_SHIFT) &
+		MDIO_CMD_MII_PHY_REG_ADDR_MASK;
+
+	miiaddr &= ~MDIO_CMD_MII_PHY_ADDR_MASK;
+	miiaddr |= (addr << MDIO_CMD_MII_PHY_ADDR_SHIFT) &
+		MDIO_CMD_MII_PHY_ADDR_MASK;
+
+	miiaddr |= MDIO_CMD_MII_WRITE;
+	miiaddr |= MDIO_CMD_MII_BUSY;
+
+	writel(miiaddr, priv->mac_reg + EMAC_MII_CMD);
+	writel(val, priv->mac_reg + EMAC_MII_DATA);
+
+	start = get_timer(0);
+	while (get_timer(start) < timeout) {
+		if (!(readl(priv->mac_reg + EMAC_MII_CMD) &
+					MDIO_CMD_MII_BUSY)) {
+			ret = 0;
+			break;
+		}
+		udelay(10);
+	};
+
+	return ret;
+}
+
+static int _sun8i_write_hwaddr(struct emac_eth_dev *priv, u8 *mac_id)
+{
+	u32 macid_lo, macid_hi;
+
+	macid_lo = mac_id[0] + (mac_id[1] << 8) + (mac_id[2] << 16) +
+		(mac_id[3] << 24);
+	macid_hi = mac_id[4] + (mac_id[5] << 8);
+
+	writel(macid_hi, priv->mac_reg + EMAC_ADDR0_HIGH);
+	writel(macid_lo, priv->mac_reg + EMAC_ADDR0_LOW);
+
+	return 0;
+}
+
+static void sun8i_adjust_link(struct emac_eth_dev *priv,
+			      struct phy_device *phydev)
+{
+	u32 v;
+
+	v = readl(priv->mac_reg + EMAC_CTL0);
+
+	if (phydev->duplex)
+		v |= BIT(0);
+	else
+		v &= ~BIT(0);
+
+	v &= ~0x0C;
+
+	switch (phydev->speed) {
+	case 1000:
+		break;
+	case 100:
+		v |= BIT(2);
+		v |= BIT(3);
+		break;
+	case 10:
+		v |= BIT(3);
+		break;
+	}
+	writel(v, priv->mac_reg + EMAC_CTL0);
+}
+
+static int sun8i_emac_set_syscon_ephy(struct emac_eth_dev *priv, u32 *reg)
+{
+	if (priv->use_internal_phy) {
+		/* H3 based SoC's that has an Internal 100MBit PHY
+		 * needs to be configured and powered up before use
+		*/
+		*reg &= ~H3_EPHY_DEFAULT_MASK;
+		*reg |=  H3_EPHY_DEFAULT_VALUE;
+		*reg |= priv->phyaddr << H3_EPHY_ADDR_SHIFT;
+		*reg &= ~H3_EPHY_SHUTDOWN;
+		*reg |= H3_EPHY_SELECT;
+	} else
+		/* This is to select External Gigabit PHY on
+		 * the boards with H3 SoC.
+		*/
+		*reg &= ~H3_EPHY_SELECT;
+
+	return 0;
+}
+
+static int sun8i_emac_set_syscon(struct emac_eth_dev *priv)
+{
+	int ret;
+	u32 reg;
+
+	reg = readl(priv->sysctl_reg);
+
+	if (priv->variant == H3_EMAC) {
+		ret = sun8i_emac_set_syscon_ephy(priv, &reg);
+		if (ret)
+			return ret;
+	}
+
+	reg &= ~(SC_ETCS_MASK | SC_EPIT);
+	if (priv->variant == H3_EMAC || priv->variant == A64_EMAC)
+		reg &= ~SC_RMII_EN;
+
+	switch (priv->interface) {
+	case PHY_INTERFACE_MODE_MII:
+		/* default */
+		break;
+	case PHY_INTERFACE_MODE_RGMII:
+		reg |= SC_EPIT | SC_ETCS_INT_GMII;
+		break;
+	case PHY_INTERFACE_MODE_RMII:
+		if (priv->variant == H3_EMAC ||
+		    priv->variant == A64_EMAC) {
+			reg |= SC_RMII_EN | SC_ETCS_EXT_GMII;
+		break;
+		}
+		/* RMII not supported on A83T */
+	default:
+		debug("%s: Invalid PHY interface\n", __func__);
+		return -EINVAL;
+	}
+
+	writel(reg, priv->sysctl_reg);
+
+	return 0;
+}
+
+static int sun8i_phy_init(struct emac_eth_dev *priv, void *dev)
+{
+	struct phy_device *phydev;
+
+	phydev = phy_connect(priv->bus, priv->phyaddr, dev, priv->interface);
+	if (!phydev)
+		return -ENODEV;
+
+	phy_connect_dev(phydev, dev);
+
+	priv->phydev = phydev;
+	phy_config(priv->phydev);
+
+	return 0;
+}
+
+static void rx_descs_init(struct emac_eth_dev *priv)
+{
+	struct emac_dma_desc *desc_table_p = &priv->rx_chain[0];
+	char *rxbuffs = &priv->rxbuffer[0];
+	struct emac_dma_desc *desc_p;
+	u32 idx;
+
+	/* flush Rx buffers */
+	flush_dcache_range((uintptr_t)rxbuffs, (ulong)rxbuffs +
+			RX_TOTAL_BUFSIZE);
+
+	for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
+		desc_p = &desc_table_p[idx];
+		desc_p->buf_addr = (uintptr_t)&rxbuffs[idx * CONFIG_ETH_BUFSIZE]
+			;
+		desc_p->next = (uintptr_t)&desc_table_p[idx + 1];
+		desc_p->st |= CONFIG_ETH_BUFSIZE;
+		desc_p->status = BIT(31);
+	}
+
+	/* Correcting the last pointer of the chain */
+	desc_p->next = (uintptr_t)&desc_table_p[0];
+
+	flush_dcache_range((uintptr_t)priv->rx_chain,
+			   (uintptr_t)priv->rx_chain +
+			sizeof(priv->rx_chain));
+
+	writel((uintptr_t)&desc_table_p[0], (priv->mac_reg + EMAC_RX_DMA_DESC));
+	priv->rx_currdescnum = 0;
+}
+
+static void tx_descs_init(struct emac_eth_dev *priv)
+{
+	struct emac_dma_desc *desc_table_p = &priv->tx_chain[0];
+	char *txbuffs = &priv->txbuffer[0];
+	struct emac_dma_desc *desc_p;
+	u32 idx;
+
+	for (idx = 0; idx < CONFIG_TX_DESCR_NUM; idx++) {
+		desc_p = &desc_table_p[idx];
+		desc_p->buf_addr = (uintptr_t)&txbuffs[idx * CONFIG_ETH_BUFSIZE]
+			;
+		desc_p->next = (uintptr_t)&desc_table_p[idx + 1];
+		desc_p->status = (1 << 31);
+		desc_p->st = 0;
+	}
+
+	/* Correcting the last pointer of the chain */
+	desc_p->next =  (uintptr_t)&desc_table_p[0];
+
+	/* Flush all Tx buffer descriptors */
+	flush_dcache_range((uintptr_t)priv->tx_chain,
+			   (uintptr_t)priv->tx_chain +
+			sizeof(priv->tx_chain));
+
+	writel((uintptr_t)&desc_table_p[0], priv->mac_reg + EMAC_TX_DMA_DESC);
+	priv->tx_currdescnum = 0;
+}
+
+static int _sun8i_emac_eth_init(struct emac_eth_dev *priv, u8 *enetaddr)
+{
+	u32 reg, v;
+	int timeout = 100;
+
+	reg = readl((priv->mac_reg + EMAC_CTL1));
+
+	if (!(reg & 0x1)) {
+		/* Soft reset MAC */
+		setbits_le32((priv->mac_reg + EMAC_CTL1), 0x1);
+		do {
+			reg = readl(priv->mac_reg + EMAC_CTL1);
+		} while ((reg & 0x01) != 0 &&  (--timeout));
+		if (!timeout) {
+			printf("%s: Timeout\n", __func__);
+			return -1;
+		}
+	}
+
+	/* Rewrite mac address after reset */
+	_sun8i_write_hwaddr(priv, enetaddr);
+
+	v = readl(priv->mac_reg + EMAC_TX_CTL1);
+	/* TX_MD Transmission starts after a full frame located in TX DMA FIFO*/
+	v |= BIT(1);
+	writel(v, priv->mac_reg + EMAC_TX_CTL1);
+
+	v = readl(priv->mac_reg + EMAC_RX_CTL1);
+	/* RX_MD RX DMA reads data from RX DMA FIFO to host memory after a
+	 * complete frame has been written to RX DMA FIFO
+	 */
+	v |= BIT(1);
+	writel(v, priv->mac_reg + EMAC_RX_CTL1);
+
+	/* DMA */
+	writel(8 << 24, priv->mac_reg + EMAC_CTL1);
+
+	/* Initialize rx/tx descriptors */
+	rx_descs_init(priv);
+	tx_descs_init(priv);
+
+	/* PHY Start Up */
+	genphy_parse_link(priv->phydev);
+
+	sun8i_adjust_link(priv, priv->phydev);
+
+	/* Start RX DMA */
+	v = readl(priv->mac_reg + EMAC_RX_CTL1);
+	v |= BIT(30);
+	writel(v, priv->mac_reg + EMAC_RX_CTL1);
+	/* Start TX DMA */
+	v = readl(priv->mac_reg + EMAC_TX_CTL1);
+	v |= BIT(30);
+	writel(v, priv->mac_reg + EMAC_TX_CTL1);
+
+	/* Enable RX/TX */
+	setbits_le32(priv->mac_reg + EMAC_RX_CTL0, BIT(31));
+	setbits_le32(priv->mac_reg + EMAC_TX_CTL0, BIT(31));
+
+	return 0;
+}
+
+static int parse_phy_pins(struct udevice *dev)
+{
+	int offset;
+	const char *pin_name;
+	int drive, pull, i;
+
+	offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset,
+				       "pinctrl-0");
+	if (offset < 0) {
+		printf("WARNING: emac: cannot find pinctrl-0 node\n");
+		return offset;
+	}
+
+	drive = fdt_getprop_u32_default_node(gd->fdt_blob, offset, 0,
+					     "allwinner,drive", 4);
+	pull = fdt_getprop_u32_default_node(gd->fdt_blob, offset, 0,
+					    "allwinner,pull", 0);
+	for (i = 0; ; i++) {
+		int pin;
+
+		if (fdt_get_string_index(gd->fdt_blob, offset,
+					 "allwinner,pins", i, &pin_name))
+			break;
+		if (pin_name[0] != 'P')
+			continue;
+		pin = (pin_name[1] - 'A') << 5;
+		if (pin >= 26 << 5)
+			continue;
+		pin += simple_strtol(&pin_name[2], NULL, 10);
+
+		sunxi_gpio_set_cfgpin(pin, SUN8I_GPD8_GMAC);
+		sunxi_gpio_set_drv(pin, drive);
+		sunxi_gpio_set_pull(pin, pull);
+	}
+
+	if (!i) {
+		printf("WARNING: emac: cannot find allwinner,pins property\n");
+		return -2;
+	}
+
+	return 0;
+}
+
+static int _sun8i_eth_recv(struct emac_eth_dev *priv, uchar **packetp)
+{
+	u32 status, desc_num = priv->rx_currdescnum;
+	struct emac_dma_desc *desc_p = &priv->rx_chain[desc_num];
+	int length = -EAGAIN;
+	int good_packet = 1;
+	uintptr_t desc_start = (uintptr_t)desc_p;
+	uintptr_t desc_end = desc_start +
+		roundup(sizeof(*desc_p), ARCH_DMA_MINALIGN);
+
+	ulong data_start = (uintptr_t)desc_p->buf_addr;
+	ulong data_end;
+
+	/* Invalidate entire buffer descriptor */
+	invalidate_dcache_range(desc_start, desc_end);
+
+	status = desc_p->status;
+
+	/* Check for DMA own bit */
+	if (!(status & BIT(31))) {
+		length = (desc_p->status >> 16) & 0x3FFF;
+
+		if (length < 0x40) {
+			good_packet = 0;
+			debug("RX: Bad Packet (runt)\n");
+		}
+
+		data_end = data_start + length;
+		/* Invalidate received data */
+		invalidate_dcache_range(rounddown(data_start,
+						  ARCH_DMA_MINALIGN),
+					roundup(data_end,
+						ARCH_DMA_MINALIGN));
+		if (good_packet) {
+			if (length > CONFIG_ETH_BUFSIZE) {
+				printf("Received packet is too big (len=%d)\n",
+				       length);
+				return -EMSGSIZE;
+			}
+			*packetp = (uchar *)(ulong)desc_p->buf_addr;
+			return length;
+		}
+	}
+
+	return length;
+}
+
+static int _sun8i_emac_eth_send(struct emac_eth_dev *priv, void *packet,
+				int len)
+{
+	u32 v, desc_num = priv->tx_currdescnum;
+	struct emac_dma_desc *desc_p = &priv->tx_chain[desc_num];
+	uintptr_t desc_start = (uintptr_t)desc_p;
+	uintptr_t desc_end = desc_start +
+		roundup(sizeof(*desc_p), ARCH_DMA_MINALIGN);
+
+	uintptr_t data_start = (uintptr_t)desc_p->buf_addr;
+	uintptr_t data_end = data_start +
+		roundup(len, ARCH_DMA_MINALIGN);
+
+	/* Invalidate entire buffer descriptor */
+	invalidate_dcache_range(desc_start, desc_end);
+
+	desc_p->st = len;
+	/* Mandatory undocumented bit */
+	desc_p->st |= BIT(24);
+
+	memcpy((void *)data_start, packet, len);
+
+	/* Flush data to be sent */
+	flush_dcache_range(data_start, data_end);
+
+	/* frame end */
+	desc_p->st |= BIT(30);
+	desc_p->st |= BIT(31);
+
+	/*frame begin */
+	desc_p->st |= BIT(29);
+	desc_p->status = BIT(31);
+
+	/*Descriptors st and status field has changed, so FLUSH it */
+	flush_dcache_range(desc_start, desc_end);
+
+	/* Move to next Descriptor and wrap around */
+	if (++desc_num >= CONFIG_TX_DESCR_NUM)
+		desc_num = 0;
+	priv->tx_currdescnum = desc_num;
+
+	/* Start the DMA */
+	v = readl(priv->mac_reg + EMAC_TX_CTL1);
+	v |= BIT(31);/* mandatory */
+	v |= BIT(30);/* mandatory */
+	writel(v, priv->mac_reg + EMAC_TX_CTL1);
+
+	return 0;
+}
+
+static int sun8i_eth_write_hwaddr(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct emac_eth_dev *priv = dev_get_priv(dev);
+
+	return _sun8i_write_hwaddr(priv, pdata->enetaddr);
+}
+
+static void sun8i_emac_board_setup(struct emac_eth_dev *priv)
+{
+	struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+
+	if (priv->use_internal_phy) {
+		/* Set clock gating for ephy */
+		setbits_le32(&ccm->bus_gate4, BIT(AHB_GATE_OFFSET_EPHY));
+
+		/* Set Tx clock source as MII with rate 25 MZ */
+		setbits_le32(priv->sysctl_reg, SCTL_EMAC_TX_CLK_SRC_MII |
+				SCTL_EMAC_EPIT_MII | SCTL_EMAC_CLK_SEL);
+		/* Deassert EPHY */
+		setbits_le32(&ccm->ahb_reset2_cfg, BIT(AHB_RESET_OFFSET_EPHY));
+	}
+
+	/* Set clock gating for emac */
+	setbits_le32(&ccm->ahb_gate0, BIT(AHB_GATE_OFFSET_GMAC));
+
+	/* Set EMAC clock */
+	setbits_le32(&ccm->axi_gate, (BIT(1) | BIT(0)));
+
+	/* De-assert EMAC */
+	setbits_le32(&ccm->ahb_reset0_cfg, BIT(AHB_RESET_OFFSET_GMAC));
+}
+
+static int sun8i_mdio_init(const char *name, struct  emac_eth_dev *priv)
+{
+	struct mii_dev *bus = mdio_alloc();
+
+	if (!bus) {
+		debug("Failed to allocate MDIO bus\n");
+		return -ENOMEM;
+	}
+
+	bus->read = sun8i_mdio_read;
+	bus->write = sun8i_mdio_write;
+	snprintf(bus->name, sizeof(bus->name), name);
+	bus->priv = (void *)priv;
+
+	return  mdio_register(bus);
+}
+
+static int sun8i_emac_eth_start(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+
+	return _sun8i_emac_eth_init(dev->priv, pdata->enetaddr);
+}
+
+static int sun8i_emac_eth_send(struct udevice *dev, void *packet, int length)
+{
+	struct emac_eth_dev *priv = dev_get_priv(dev);
+
+	return _sun8i_emac_eth_send(priv, packet, length);
+}
+
+static int sun8i_emac_eth_recv(struct udevice *dev, int flags, uchar **packetp)
+{
+	struct emac_eth_dev *priv = dev_get_priv(dev);
+
+	return _sun8i_eth_recv(priv, packetp);
+}
+
+static int _sun8i_free_pkt(struct emac_eth_dev *priv)
+{
+	u32 desc_num = priv->rx_currdescnum;
+	struct emac_dma_desc *desc_p = &priv->rx_chain[desc_num];
+	uintptr_t desc_start = (uintptr_t)desc_p;
+	uintptr_t desc_end = desc_start +
+		roundup(sizeof(u32), ARCH_DMA_MINALIGN);
+
+	/* Make the current descriptor valid again */
+	desc_p->status |= BIT(31);
+
+	/* Flush Status field of descriptor */
+	flush_dcache_range(desc_start, desc_end);
+
+	/* Move to next desc and wrap-around condition. */
+	if (++desc_num >= CONFIG_RX_DESCR_NUM)
+		desc_num = 0;
+	priv->rx_currdescnum = desc_num;
+
+	return 0;
+}
+
+static int sun8i_eth_free_pkt(struct udevice *dev, uchar *packet,
+			      int length)
+{
+	struct emac_eth_dev *priv = dev_get_priv(dev);
+
+	return _sun8i_free_pkt(priv);
+}
+
+static void sun8i_emac_eth_stop(struct udevice *dev)
+{
+	struct emac_eth_dev *priv = dev_get_priv(dev);
+
+	/* Stop Rx/Tx transmitter */
+	clrbits_le32(priv->mac_reg + EMAC_RX_CTL0, BIT(31));
+	clrbits_le32(priv->mac_reg + EMAC_TX_CTL0, BIT(31));
+
+	/* Stop TX DMA */
+	clrbits_le32(priv->mac_reg + EMAC_TX_CTL1, BIT(30));
+
+	phy_shutdown(priv->phydev);
+}
+
+static int sun8i_emac_eth_probe(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct emac_eth_dev *priv = dev_get_priv(dev);
+
+	priv->mac_reg = (void *)pdata->iobase;
+
+	sun8i_emac_board_setup(priv);
+
+	sun8i_mdio_init(dev->name, priv);
+	priv->bus = miiphy_get_dev_by_name(dev->name);
+
+	sun8i_emac_set_syscon(priv);
+
+	return sun8i_phy_init(priv, dev);
+}
+
+static const struct eth_ops sun8i_emac_eth_ops = {
+	.start                  = sun8i_emac_eth_start,
+	.write_hwaddr           = sun8i_eth_write_hwaddr,
+	.send                   = sun8i_emac_eth_send,
+	.recv                   = sun8i_emac_eth_recv,
+	.free_pkt               = sun8i_eth_free_pkt,
+	.stop                   = sun8i_emac_eth_stop,
+};
+
+static int sun8i_emac_eth_ofdata_to_platdata(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct emac_eth_dev *priv = dev_get_priv(dev);
+	const char *phy_mode;
+	int offset = 0;
+
+	pdata->iobase = dev_get_addr_name(dev, "emac");
+	priv->sysctl_reg = dev_get_addr_name(dev, "syscon");
+
+	pdata->phy_interface = -1;
+	priv->phyaddr = -1;
+	priv->use_internal_phy = false;
+
+	offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset,
+				       "phy");
+	if (offset > 0)
+		priv->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg",
+					       -1);
+
+	phy_mode = fdt_getprop(gd->fdt_blob, dev->of_offset, "phy-mode", NULL);
+
+	if (phy_mode)
+		pdata->phy_interface = phy_get_interface_by_name(phy_mode);
+	printf("phy interface%d\n", pdata->phy_interface);
+
+	if (pdata->phy_interface == -1) {
+		debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
+		return -EINVAL;
+	}
+
+	priv->variant = dev_get_driver_data(dev);
+
+	if (!priv->variant) {
+		printf("%s: Missing variant '%s'\n", __func__,
+		       (char *)priv->variant);
+		return -EINVAL;
+	}
+
+	if (priv->variant == H3_EMAC) {
+		if (fdt_getprop(gd->fdt_blob, dev->of_offset,
+				"allwinner,use-internal-phy", NULL))
+			priv->use_internal_phy = true;
+	}
+
+	priv->interface = pdata->phy_interface;
+
+	if (!priv->use_internal_phy)
+		parse_phy_pins(dev);
+
+	return 0;
+}
+
+static const struct udevice_id sun8i_emac_eth_ids[] = {
+	{.compatible = "allwinner,sun8i-h3-emac", .data = (uintptr_t)H3_EMAC },
+	{.compatible = "allwinner,sun50i-a64-emac",
+		.data = (uintptr_t)A64_EMAC },
+	{.compatible = "allwinner,sun8i-a83t-emac",
+		.data = (uintptr_t)A83T_EMAC },
+	{ }
+};
+
+U_BOOT_DRIVER(eth_sun8i_emac) = {
+	.name   = "eth_sun8i_emac",
+	.id     = UCLASS_ETH,
+	.of_match = sun8i_emac_eth_ids,
+	.ofdata_to_platdata = sun8i_emac_eth_ofdata_to_platdata,
+	.probe  = sun8i_emac_eth_probe,
+	.ops    = &sun8i_emac_eth_ops,
+	.priv_auto_alloc_size = sizeof(struct emac_eth_dev),
+	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
+	.flags = DM_FLAG_ALLOC_PRIV_DMA,
+};