Add support for SMSC95XX USB 2.0 10/100MBit Ethernet Adapter

The SMSC95XX is a USB hub with a built-in Ethernet adapter. This adds support
for this, using the USB host network framework.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Eric Bénard <eric@eukrea.com>

3 files changed, 887 insertions, 0 deletions

diff --git a/drivers/usb/eth/Makefile b/drivers/usb/eth/Makefile
index a8e9eff..51b5b46 100644
--- a/drivers/usb/eth/Makefile
+++ b/drivers/usb/eth/Makefile
@@ -28,6 +28,7 @@ COBJS-$(CONFIG_USB_HOST_ETHER) += usb_ether.o
 ifdef CONFIG_USB_ETHER_ASIX
 COBJS-y += asix.o
 endif
+COBJS-$(CONFIG_USB_ETHER_SMSC95XX) += smsc95xx.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/usb/eth/smsc95xx.c b/drivers/usb/eth/smsc95xx.c
new file mode 100644
index 0000000..97f2729
--- /dev/null
+++ b/drivers/usb/eth/smsc95xx.c
@@ -0,0 +1,879 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * Copyright (C) 2009 NVIDIA, Corporation
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <usb.h>
+#include <linux/mii.h>
+#include "usb_ether.h"
+
+/* SMSC LAN95xx based USB 2.0 Ethernet Devices */
+
+/* Tx command words */
+#define TX_CMD_A_FIRST_SEG_		0x00002000
+#define TX_CMD_A_LAST_SEG_		0x00001000
+
+/* Rx status word */
+#define RX_STS_FL_			0x3FFF0000	/* Frame Length */
+#define RX_STS_ES_			0x00008000	/* Error Summary */
+
+/* SCSRs */
+#define ID_REV				0x00
+
+#define INT_STS				0x08
+
+#define TX_CFG				0x10
+#define TX_CFG_ON_			0x00000004
+
+#define HW_CFG				0x14
+#define HW_CFG_BIR_			0x00001000
+#define HW_CFG_RXDOFF_			0x00000600
+#define HW_CFG_MEF_			0x00000020
+#define HW_CFG_BCE_			0x00000002
+#define HW_CFG_LRST_			0x00000008
+
+#define PM_CTRL				0x20
+#define PM_CTL_PHY_RST_			0x00000010
+
+#define AFC_CFG				0x2C
+
+/*
+ * Hi watermark = 15.5Kb (~10 mtu pkts)
+ * low watermark = 3k (~2 mtu pkts)
+ * backpressure duration = ~ 350us
+ * Apply FC on any frame.
+ */
+#define AFC_CFG_DEFAULT			0x00F830A1
+
+#define E2P_CMD				0x30
+#define E2P_CMD_BUSY_			0x80000000
+#define E2P_CMD_READ_			0x00000000
+#define E2P_CMD_TIMEOUT_		0x00000400
+#define E2P_CMD_LOADED_			0x00000200
+#define E2P_CMD_ADDR_			0x000001FF
+
+#define E2P_DATA			0x34
+
+#define BURST_CAP			0x38
+
+#define INT_EP_CTL			0x68
+#define INT_EP_CTL_PHY_INT_		0x00008000
+
+#define BULK_IN_DLY			0x6C
+
+/* MAC CSRs */
+#define MAC_CR				0x100
+#define MAC_CR_MCPAS_			0x00080000
+#define MAC_CR_PRMS_			0x00040000
+#define MAC_CR_HPFILT_			0x00002000
+#define MAC_CR_TXEN_			0x00000008
+#define MAC_CR_RXEN_			0x00000004
+
+#define ADDRH				0x104
+
+#define ADDRL				0x108
+
+#define MII_ADDR			0x114
+#define MII_WRITE_			0x02
+#define MII_BUSY_			0x01
+#define MII_READ_			0x00 /* ~of MII Write bit */
+
+#define MII_DATA			0x118
+
+#define FLOW				0x11C
+
+#define VLAN1				0x120
+
+#define COE_CR				0x130
+#define Tx_COE_EN_			0x00010000
+#define Rx_COE_EN_			0x00000001
+
+/* Vendor-specific PHY Definitions */
+#define PHY_INT_SRC			29
+
+#define PHY_INT_MASK			30
+#define PHY_INT_MASK_ANEG_COMP_		((u16)0x0040)
+#define PHY_INT_MASK_LINK_DOWN_		((u16)0x0010)
+#define PHY_INT_MASK_DEFAULT_		(PHY_INT_MASK_ANEG_COMP_ | \
+					 PHY_INT_MASK_LINK_DOWN_)
+
+/* USB Vendor Requests */
+#define USB_VENDOR_REQUEST_WRITE_REGISTER	0xA0
+#define USB_VENDOR_REQUEST_READ_REGISTER	0xA1
+
+/* Some extra defines */
+#define HS_USB_PKT_SIZE			512
+#define FS_USB_PKT_SIZE			64
+#define DEFAULT_HS_BURST_CAP_SIZE	(16 * 1024 + 5 * HS_USB_PKT_SIZE)
+#define DEFAULT_FS_BURST_CAP_SIZE	(6 * 1024 + 33 * FS_USB_PKT_SIZE)
+#define DEFAULT_BULK_IN_DELAY		0x00002000
+#define MAX_SINGLE_PACKET_SIZE		2048
+#define EEPROM_MAC_OFFSET		0x01
+#define SMSC95XX_INTERNAL_PHY_ID	1
+#define ETH_P_8021Q	0x8100          /* 802.1Q VLAN Extended Header  */
+
+/* local defines */
+#define SMSC95XX_BASE_NAME "sms"
+#define USB_CTRL_SET_TIMEOUT 5000
+#define USB_CTRL_GET_TIMEOUT 5000
+#define USB_BULK_SEND_TIMEOUT 5000
+#define USB_BULK_RECV_TIMEOUT 5000
+
+#define AX_RX_URB_SIZE 2048
+#define PHY_CONNECT_TIMEOUT 5000
+
+#define TURBO_MODE
+
+/* local vars */
+static int curr_eth_dev; /* index for name of next device detected */
+
+
+/*
+ * Smsc95xx infrastructure commands
+ */
+static int smsc95xx_write_reg(struct ueth_data *dev, u32 index, u32 data)
+{
+	int len;
+
+	cpu_to_le32s(&data);
+
+	len = usb_control_msg(dev->pusb_dev, usb_sndctrlpipe(dev->pusb_dev, 0),
+		USB_VENDOR_REQUEST_WRITE_REGISTER,
+		USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		00, index, &data, sizeof(data), USB_CTRL_SET_TIMEOUT);
+	if (len != sizeof(data)) {
+		debug("smsc95xx_write_reg failed: index=%d, data=%d, len=%d",
+		      index, data, len);
+		return -1;
+	}
+	return 0;
+}
+
+static int smsc95xx_read_reg(struct ueth_data *dev, u32 index, u32 *data)
+{
+	int len;
+
+	len = usb_control_msg(dev->pusb_dev, usb_rcvctrlpipe(dev->pusb_dev, 0),
+		USB_VENDOR_REQUEST_READ_REGISTER,
+		USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		00, index, data, sizeof(data), USB_CTRL_GET_TIMEOUT);
+	if (len != sizeof(data)) {
+		debug("smsc95xx_read_reg failed: index=%d, len=%d",
+		      index, len);
+		return -1;
+	}
+
+	le32_to_cpus(data);
+	return 0;
+}
+
+/* Loop until the read is completed with timeout */
+static int smsc95xx_phy_wait_not_busy(struct ueth_data *dev)
+{
+	unsigned long start_time = get_timer(0);
+	u32 val;
+
+	do {
+		smsc95xx_read_reg(dev, MII_ADDR, &val);
+		if (!(val & MII_BUSY_))
+			return 0;
+	} while (get_timer(start_time) < 1 * 1000 * 1000);
+
+	return -1;
+}
+
+static int smsc95xx_mdio_read(struct ueth_data *dev, int phy_id, int idx)
+{
+	u32 val, addr;
+
+	/* confirm MII not busy */
+	if (smsc95xx_phy_wait_not_busy(dev)) {
+		debug("MII is busy in smsc95xx_mdio_read\n");
+		return -1;
+	}
+
+	/* set the address, index & direction (read from PHY) */
+	addr = (phy_id << 11) | (idx << 6) | MII_READ_;
+	smsc95xx_write_reg(dev, MII_ADDR, addr);
+
+	if (smsc95xx_phy_wait_not_busy(dev)) {
+		debug("Timed out reading MII reg %02X\n", idx);
+		return -1;
+	}
+
+	smsc95xx_read_reg(dev, MII_DATA, &val);
+
+	return (u16)(val & 0xFFFF);
+}
+
+static void smsc95xx_mdio_write(struct ueth_data *dev, int phy_id, int idx,
+				int regval)
+{
+	u32 val, addr;
+
+	/* confirm MII not busy */
+	if (smsc95xx_phy_wait_not_busy(dev)) {
+		debug("MII is busy in smsc95xx_mdio_write\n");
+		return;
+	}
+
+	val = regval;
+	smsc95xx_write_reg(dev, MII_DATA, val);
+
+	/* set the address, index & direction (write to PHY) */
+	addr = (phy_id << 11) | (idx << 6) | MII_WRITE_;
+	smsc95xx_write_reg(dev, MII_ADDR, addr);
+
+	if (smsc95xx_phy_wait_not_busy(dev))
+		debug("Timed out writing MII reg %02X\n", idx);
+}
+
+static int smsc95xx_eeprom_confirm_not_busy(struct ueth_data *dev)
+{
+	unsigned long start_time = get_timer(0);
+	u32 val;
+
+	do {
+		smsc95xx_read_reg(dev, E2P_CMD, &val);
+		if (!(val & E2P_CMD_LOADED_)) {
+			debug("No EEPROM present\n");
+			return -1;
+		}
+		if (!(val & E2P_CMD_BUSY_))
+			return 0;
+		udelay(40);
+	} while (get_timer(start_time) < 1 * 1000 * 1000);
+
+	debug("EEPROM is busy\n");
+	return -1;
+}
+
+static int smsc95xx_wait_eeprom(struct ueth_data *dev)
+{
+	unsigned long start_time = get_timer(0);
+	u32 val;
+
+	do {
+		smsc95xx_read_reg(dev, E2P_CMD, &val);
+		if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
+			break;
+		udelay(40);
+	} while (get_timer(start_time) < 1 * 1000 * 1000);
+
+	if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
+		debug("EEPROM read operation timeout\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int smsc95xx_read_eeprom(struct ueth_data *dev, u32 offset, u32 length,
+				u8 *data)
+{
+	u32 val;
+	int i, ret;
+
+	ret = smsc95xx_eeprom_confirm_not_busy(dev);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < length; i++) {
+		val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
+		smsc95xx_write_reg(dev, E2P_CMD, val);
+
+		ret = smsc95xx_wait_eeprom(dev);
+		if (ret < 0)
+			return ret;
+
+		smsc95xx_read_reg(dev, E2P_DATA, &val);
+		data[i] = val & 0xFF;
+		offset++;
+	}
+	return 0;
+}
+
+/*
+ * mii_nway_restart - restart NWay (autonegotiation) for this interface
+ *
+ * Returns 0 on success, negative on error.
+ */
+static int mii_nway_restart(struct ueth_data *dev)
+{
+	int bmcr;
+	int r = -1;
+
+	/* if autoneg is off, it's an error */
+	bmcr = smsc95xx_mdio_read(dev, dev->phy_id, MII_BMCR);
+
+	if (bmcr & BMCR_ANENABLE) {
+		bmcr |= BMCR_ANRESTART;
+		smsc95xx_mdio_write(dev, dev->phy_id, MII_BMCR, bmcr);
+		r = 0;
+	}
+	return r;
+}
+
+static int smsc95xx_phy_initialize(struct ueth_data *dev)
+{
+	smsc95xx_mdio_write(dev, dev->phy_id, MII_BMCR, BMCR_RESET);
+	smsc95xx_mdio_write(dev, dev->phy_id, MII_ADVERTISE,
+		ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
+		ADVERTISE_PAUSE_ASYM);
+
+	/* read to clear */
+	smsc95xx_mdio_read(dev, dev->phy_id, PHY_INT_SRC);
+
+	smsc95xx_mdio_write(dev, dev->phy_id, PHY_INT_MASK,
+		PHY_INT_MASK_DEFAULT_);
+	mii_nway_restart(dev);
+
+	debug("phy initialised succesfully\n");
+	return 0;
+}
+
+static int smsc95xx_init_mac_address(struct eth_device *eth,
+		struct ueth_data *dev)
+{
+	/* try reading mac address from EEPROM */
+	if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
+			eth->enetaddr) == 0) {
+		if (is_valid_ether_addr(eth->enetaddr)) {
+			/* eeprom values are valid so use them */
+			debug("MAC address read from EEPROM\n");
+			return 0;
+		}
+	}
+
+	/*
+	 * No eeprom, or eeprom values are invalid. Generating a random MAC
+	 * address is not safe. Just return an error.
+	 */
+	return -1;
+}
+
+static int smsc95xx_write_hwaddr(struct eth_device *eth)
+{
+	struct ueth_data *dev = (struct ueth_data *)eth->priv;
+	u32 addr_lo, addr_hi;
+	int ret;
+
+	/* set hardware address */
+	debug("** %s()\n", __func__);
+	addr_lo = cpu_to_le32(*((u32 *)eth->enetaddr));
+	addr_hi = cpu_to_le16(*((u16 *)(eth->enetaddr + 4)));
+	ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
+	if (ret < 0) {
+		debug("Failed to write ADDRL: %d\n", ret);
+		return ret;
+	}
+
+	ret = smsc95xx_write_reg(dev, ADDRH, addr_hi);
+	if (ret < 0)
+		return ret;
+	debug("MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
+		eth->enetaddr[0], eth->enetaddr[1],
+		eth->enetaddr[2], eth->enetaddr[3],
+		eth->enetaddr[4], eth->enetaddr[5]);
+	dev->have_hwaddr = 1;
+	return 0;
+}
+
+/* Enable or disable Tx & Rx checksum offload engines */
+static int smsc95xx_set_csums(struct ueth_data *dev,
+		int use_tx_csum, int use_rx_csum)
+{
+	u32 read_buf;
+	int ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
+	if (ret < 0)
+		return ret;
+
+	if (use_tx_csum)
+		read_buf |= Tx_COE_EN_;
+	else
+		read_buf &= ~Tx_COE_EN_;
+
+	if (use_rx_csum)
+		read_buf |= Rx_COE_EN_;
+	else
+		read_buf &= ~Rx_COE_EN_;
+
+	ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
+	if (ret < 0)
+		return ret;
+
+	debug("COE_CR = 0x%08x\n", read_buf);
+	return 0;
+}
+
+static void smsc95xx_set_multicast(struct ueth_data *dev)
+{
+	/* No multicast in u-boot */
+	dev->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
+}
+
+/* starts the TX path */
+static void smsc95xx_start_tx_path(struct ueth_data *dev)
+{
+	u32 reg_val;
+
+	/* Enable Tx at MAC */
+	dev->mac_cr |= MAC_CR_TXEN_;
+
+	smsc95xx_write_reg(dev, MAC_CR, dev->mac_cr);
+
+	/* Enable Tx at SCSRs */
+	reg_val = TX_CFG_ON_;
+	smsc95xx_write_reg(dev, TX_CFG, reg_val);
+}
+
+/* Starts the Receive path */
+static void smsc95xx_start_rx_path(struct ueth_data *dev)
+{
+	dev->mac_cr |= MAC_CR_RXEN_;
+	smsc95xx_write_reg(dev, MAC_CR, dev->mac_cr);
+}
+
+/*
+ * Smsc95xx callbacks
+ */
+static int smsc95xx_init(struct eth_device *eth, bd_t *bd)
+{
+	int ret;
+	u32 write_buf;
+	u32 read_buf;
+	u32 burst_cap;
+	int timeout;
+	struct ueth_data *dev = (struct ueth_data *)eth->priv;
+#define TIMEOUT_RESOLUTION 50	/* ms */
+	int link_detected;
+
+	debug("** %s()\n", __func__);
+	dev->phy_id = SMSC95XX_INTERNAL_PHY_ID; /* fixed phy id */
+
+	write_buf = HW_CFG_LRST_;
+	ret = smsc95xx_write_reg(dev, HW_CFG, write_buf);
+	if (ret < 0)
+		return ret;
+
+	timeout = 0;
+	do {
+		ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
+		if (ret < 0)
+			return ret;
+		udelay(10 * 1000);
+		timeout++;
+	} while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
+
+	if (timeout >= 100) {
+		debug("timeout waiting for completion of Lite Reset\n");
+		return -1;
+	}
+
+	write_buf = PM_CTL_PHY_RST_;
+	ret = smsc95xx_write_reg(dev, PM_CTRL, write_buf);
+	if (ret < 0)
+		return ret;
+
+	timeout = 0;
+	do {
+		ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
+		if (ret < 0)
+			return ret;
+		udelay(10 * 1000);
+		timeout++;
+	} while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
+	if (timeout >= 100) {
+		debug("timeout waiting for PHY Reset\n");
+		return -1;
+	}
+	if (!dev->have_hwaddr && smsc95xx_init_mac_address(eth, dev) == 0)
+		dev->have_hwaddr = 1;
+	if (!dev->have_hwaddr) {
+		puts("Error: SMSC95xx: No MAC address set - set usbethaddr\n");
+		return -1;
+	}
+	if (smsc95xx_write_hwaddr(eth) < 0)
+		return -1;
+
+	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
+	if (ret < 0)
+		return ret;
+	debug("Read Value from HW_CFG : 0x%08x\n", read_buf);
+
+	read_buf |= HW_CFG_BIR_;
+	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
+	if (ret < 0)
+		return ret;
+
+	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
+	if (ret < 0)
+		return ret;
+	debug("Read Value from HW_CFG after writing "
+		"HW_CFG_BIR_: 0x%08x\n", read_buf);
+
+#ifdef TURBO_MODE
+	if (dev->pusb_dev->speed == USB_SPEED_HIGH) {
+		burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
+		dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
+	} else {
+		burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
+		dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
+	}
+#else
+	burst_cap = 0;
+	dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
+#endif
+	debug("rx_urb_size=%ld\n", (ulong)dev->rx_urb_size);
+
+	ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
+	if (ret < 0)
+		return ret;
+
+	ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
+	if (ret < 0)
+		return ret;
+	debug("Read Value from BURST_CAP after writing: 0x%08x\n", read_buf);
+
+	read_buf = DEFAULT_BULK_IN_DELAY;
+	ret = smsc95xx_write_reg(dev, BULK_IN_DLY, read_buf);
+	if (ret < 0)
+		return ret;
+
+	ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
+	if (ret < 0)
+		return ret;
+	debug("Read Value from BULK_IN_DLY after writing: "
+			"0x%08x\n", read_buf);
+
+	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
+	if (ret < 0)
+		return ret;
+	debug("Read Value from HW_CFG: 0x%08x\n", read_buf);
+
+#ifdef TURBO_MODE
+	read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
+#endif
+	read_buf &= ~HW_CFG_RXDOFF_;
+
+#define NET_IP_ALIGN 0
+	read_buf |= NET_IP_ALIGN << 9;
+
+	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
+	if (ret < 0)
+		return ret;
+
+	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
+	if (ret < 0)
+		return ret;
+	debug("Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
+
+	write_buf = 0xFFFFFFFF;
+	ret = smsc95xx_write_reg(dev, INT_STS, write_buf);
+	if (ret < 0)
+		return ret;
+
+	ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
+	if (ret < 0)
+		return ret;
+	debug("ID_REV = 0x%08x\n", read_buf);
+
+	/* Init Tx */
+	write_buf = 0;
+	ret = smsc95xx_write_reg(dev, FLOW, write_buf);
+	if (ret < 0)
+		return ret;
+
+	read_buf = AFC_CFG_DEFAULT;
+	ret = smsc95xx_write_reg(dev, AFC_CFG, read_buf);
+	if (ret < 0)
+		return ret;
+
+	ret = smsc95xx_read_reg(dev, MAC_CR, &dev->mac_cr);
+	if (ret < 0)
+		return ret;
+
+	/* Init Rx. Set Vlan */
+	write_buf = (u32)ETH_P_8021Q;
+	ret = smsc95xx_write_reg(dev, VLAN1, write_buf);
+	if (ret < 0)
+		return ret;
+
+	/* Disable checksum offload engines */
+	ret = smsc95xx_set_csums(dev, 0, 0);
+	if (ret < 0) {
+		debug("Failed to set csum offload: %d\n", ret);
+		return ret;
+	}
+	smsc95xx_set_multicast(dev);
+
+	if (smsc95xx_phy_initialize(dev) < 0)
+		return -1;
+	ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
+	if (ret < 0)
+		return ret;
+
+	/* enable PHY interrupts */
+	read_buf |= INT_EP_CTL_PHY_INT_;
+
+	ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
+	if (ret < 0)
+		return ret;
+
+	smsc95xx_start_tx_path(dev);
+	smsc95xx_start_rx_path(dev);
+
+	timeout = 0;
+	do {
+		link_detected = smsc95xx_mdio_read(dev, dev->phy_id, MII_BMSR)
+			& BMSR_LSTATUS;
+		if (!link_detected) {
+			if (timeout == 0)
+				printf("Waiting for Ethernet connection... ");
+			udelay(TIMEOUT_RESOLUTION * 1000);
+			timeout += TIMEOUT_RESOLUTION;
+		}
+	} while (!link_detected && timeout < PHY_CONNECT_TIMEOUT);
+	if (link_detected) {
+		if (timeout != 0)
+			printf("done.\n");
+	} else {
+		printf("unable to connect.\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int smsc95xx_send(struct eth_device *eth, volatile void* packet,
+			 int length)
+{
+	struct ueth_data *dev = (struct ueth_data *)eth->priv;
+	int err;
+	int actual_len;
+	u32 tx_cmd_a;
+	u32 tx_cmd_b;
+	unsigned char msg[PKTSIZE + sizeof(tx_cmd_a) + sizeof(tx_cmd_b)];
+
+	debug("** %s(), len %d, buf %#x\n", __func__, length, (int)msg);
+	if (length > PKTSIZE)
+		return -1;
+
+	tx_cmd_a = (u32)length | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
+	tx_cmd_b = (u32)length;
+	cpu_to_le32s(&tx_cmd_a);
+	cpu_to_le32s(&tx_cmd_b);
+
+	/* prepend cmd_a and cmd_b */
+	memcpy(msg, &tx_cmd_a, sizeof(tx_cmd_a));
+	memcpy(msg + sizeof(tx_cmd_a), &tx_cmd_b, sizeof(tx_cmd_b));
+	memcpy(msg + sizeof(tx_cmd_a) + sizeof(tx_cmd_b), (void *)packet,
+	       length);
+	err = usb_bulk_msg(dev->pusb_dev,
+				usb_sndbulkpipe(dev->pusb_dev, dev->ep_out),
+				(void *)msg,
+				length + sizeof(tx_cmd_a) + sizeof(tx_cmd_b),
+				&actual_len,
+				USB_BULK_SEND_TIMEOUT);
+	debug("Tx: len = %u, actual = %u, err = %d\n",
+	      length + sizeof(tx_cmd_a) + sizeof(tx_cmd_b),
+	      actual_len, err);
+	return err;
+}
+
+static int smsc95xx_recv(struct eth_device *eth)
+{
+	struct ueth_data *dev = (struct ueth_data *)eth->priv;
+	static unsigned char  recv_buf[AX_RX_URB_SIZE];
+	unsigned char *buf_ptr;
+	int err;
+	int actual_len;
+	u32 packet_len;
+	int cur_buf_align;
+
+	debug("** %s()\n", __func__);
+	err = usb_bulk_msg(dev->pusb_dev,
+				usb_rcvbulkpipe(dev->pusb_dev, dev->ep_in),
+				(void *)recv_buf,
+				AX_RX_URB_SIZE,
+				&actual_len,
+				USB_BULK_RECV_TIMEOUT);
+	debug("Rx: len = %u, actual = %u, err = %d\n", AX_RX_URB_SIZE,
+	      actual_len, err);
+	if (err != 0) {
+		debug("Rx: failed to receive\n");
+		return -1;
+	}
+	if (actual_len > AX_RX_URB_SIZE) {
+		debug("Rx: received too many bytes %d\n", actual_len);
+		return -1;
+	}
+
+	buf_ptr = recv_buf;
+	while (actual_len > 0) {
+		/*
+		 * 1st 4 bytes contain the length of the actual data plus error
+		 * info. Extract data length.
+		 */
+		if (actual_len < sizeof(packet_len)) {
+			debug("Rx: incomplete packet length\n");
+			return -1;
+		}
+		memcpy(&packet_len, buf_ptr, sizeof(packet_len));
+		le32_to_cpus(&packet_len);
+		if (packet_len & RX_STS_ES_) {
+			debug("Rx: Error header=%#x", packet_len);
+			return -1;
+		}
+		packet_len = ((packet_len & RX_STS_FL_) >> 16);
+
+		if (packet_len > actual_len - sizeof(packet_len)) {
+			debug("Rx: too large packet: %d\n", packet_len);
+			return -1;
+		}
+
+		/* Notify net stack */
+		NetReceive(buf_ptr + sizeof(packet_len), packet_len - 4);
+
+		/* Adjust for next iteration */
+		actual_len -= sizeof(packet_len) + packet_len;
+		buf_ptr += sizeof(packet_len) + packet_len;
+		cur_buf_align = (int)buf_ptr - (int)recv_buf;
+
+		if (cur_buf_align & 0x03) {
+			int align = 4 - (cur_buf_align & 0x03);
+
+			actual_len -= align;
+			buf_ptr += align;
+		}
+	}
+	return err;
+}
+
+static void smsc95xx_halt(struct eth_device *eth)
+{
+	debug("** %s()\n", __func__);
+}
+
+/*
+ * SMSC probing functions
+ */
+void smsc95xx_eth_before_probe(void)
+{
+	curr_eth_dev = 0;
+}
+
+struct smsc95xx_dongle {
+	unsigned short vendor;
+	unsigned short product;
+};
+
+static const struct smsc95xx_dongle smsc95xx_dongles[] = {
+	{ 0x0424, 0xec00 },	/* LAN9512/LAN9514 Ethernet */
+	{ 0x0424, 0x9500 },	/* LAN9500 Ethernet */
+	{ 0x0000, 0x0000 }	/* END - Do not remove */
+};
+
+/* Probe to see if a new device is actually an SMSC device */
+int smsc95xx_eth_probe(struct usb_device *dev, unsigned int ifnum,
+		      struct ueth_data *ss)
+{
+	struct usb_interface *iface;
+	struct usb_interface_descriptor *iface_desc;
+	int i;
+
+	/* let's examine the device now */
+	iface = &dev->config.if_desc[ifnum];
+	iface_desc = &dev->config.if_desc[ifnum].desc;
+
+	for (i = 0; smsc95xx_dongles[i].vendor != 0; i++) {
+		if (dev->descriptor.idVendor == smsc95xx_dongles[i].vendor &&
+		    dev->descriptor.idProduct == smsc95xx_dongles[i].product)
+			/* Found a supported dongle */
+			break;
+	}
+	if (smsc95xx_dongles[i].vendor == 0)
+		return 0;
+
+	/* At this point, we know we've got a live one */
+	debug("\n\nUSB Ethernet device detected\n");
+	memset(ss, '\0', sizeof(struct ueth_data));
+
+	/* Initialize the ueth_data structure with some useful info */
+	ss->ifnum = ifnum;
+	ss->pusb_dev = dev;
+	ss->subclass = iface_desc->bInterfaceSubClass;
+	ss->protocol = iface_desc->bInterfaceProtocol;
+
+	/*
+	 * We are expecting a minimum of 3 endpoints - in, out (bulk), and int.
+	 * We will ignore any others.
+	 */
+	for (i = 0; i < iface_desc->bNumEndpoints; i++) {
+		/* is it an BULK endpoint? */
+		if ((iface->ep_desc[i].bmAttributes &
+		     USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
+			if (iface->ep_desc[i].bEndpointAddress & USB_DIR_IN)
+				ss->ep_in =
+					iface->ep_desc[i].bEndpointAddress &
+					USB_ENDPOINT_NUMBER_MASK;
+			else
+				ss->ep_out =
+					iface->ep_desc[i].bEndpointAddress &
+					USB_ENDPOINT_NUMBER_MASK;
+		}
+
+		/* is it an interrupt endpoint? */
+		if ((iface->ep_desc[i].bmAttributes &
+		    USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT) {
+			ss->ep_int = iface->ep_desc[i].bEndpointAddress &
+				USB_ENDPOINT_NUMBER_MASK;
+			ss->irqinterval = iface->ep_desc[i].bInterval;
+		}
+	}
+	debug("Endpoints In %d Out %d Int %d\n",
+		  ss->ep_in, ss->ep_out, ss->ep_int);
+
+	/* Do some basic sanity checks, and bail if we find a problem */
+	if (usb_set_interface(dev, iface_desc->bInterfaceNumber, 0) ||
+	    !ss->ep_in || !ss->ep_out || !ss->ep_int) {
+		debug("Problems with device\n");
+		return 0;
+	}
+	dev->privptr = (void *)ss;
+	return 1;
+}
+
+int smsc95xx_eth_get_info(struct usb_device *dev, struct ueth_data *ss,
+				struct eth_device *eth)
+{
+	debug("** %s()\n", __func__);
+	if (!eth) {
+		debug("%s: missing parameter.\n", __func__);
+		return 0;
+	}
+	sprintf(eth->name, "%s%d", SMSC95XX_BASE_NAME, curr_eth_dev++);
+	eth->init = smsc95xx_init;
+	eth->send = smsc95xx_send;
+	eth->recv = smsc95xx_recv;
+	eth->halt = smsc95xx_halt;
+	eth->write_hwaddr = smsc95xx_write_hwaddr;
+	eth->priv = ss;
+	return 1;
+}
diff --git a/drivers/usb/eth/usb_ether.c b/drivers/usb/eth/usb_ether.c
index 68a0883..7b55da3 100644
--- a/drivers/usb/eth/usb_ether.c
+++ b/drivers/usb/eth/usb_ether.c
@@ -45,6 +45,13 @@ static const struct usb_eth_prob_dev prob_dev[] = {
 		.get_info = asix_eth_get_info,
 	},
 #endif
+#ifdef CONFIG_USB_ETHER_SMSC95XX
+	{
+		.before_probe = smsc95xx_eth_before_probe,
+		.probe = smsc95xx_eth_probe,
+		.get_info = smsc95xx_eth_get_info,
+	},
+#endif
 	{ },		/* END */
 };