drivers/usb/eth/asix.c - filogic/uboot - Gitiles

 /*
  * Copyright (c) 2011 The Chromium OS Authors.
  * 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"


 /* ASIX AX8817X based USB 2.0 Ethernet Devices */

 #define AX_CMD_SET_SW_MII		0x06
 #define AX_CMD_READ_MII_REG		0x07
 #define AX_CMD_WRITE_MII_REG		0x08
 #define AX_CMD_SET_HW_MII		0x0a
 #define AX_CMD_READ_RX_CTL		0x0f
 #define AX_CMD_WRITE_RX_CTL		0x10
 #define AX_CMD_WRITE_IPG0		0x12
 #define AX_CMD_READ_NODE_ID		0x13
 #define AX_CMD_READ_PHY_ID		0x19
 #define AX_CMD_WRITE_MEDIUM_MODE	0x1b
 #define AX_CMD_WRITE_GPIOS		0x1f
 #define AX_CMD_SW_RESET			0x20
 #define AX_CMD_SW_PHY_SELECT		0x22

 #define AX_SWRESET_CLEAR		0x00
 #define AX_SWRESET_PRTE			0x04
 #define AX_SWRESET_PRL			0x08
 #define AX_SWRESET_IPRL			0x20
 #define AX_SWRESET_IPPD			0x40

 #define AX88772_IPG0_DEFAULT		0x15
 #define AX88772_IPG1_DEFAULT		0x0c
 #define AX88772_IPG2_DEFAULT		0x12

 /* AX88772 & AX88178 Medium Mode Register */
 #define AX_MEDIUM_PF		0x0080
 #define AX_MEDIUM_JFE		0x0040
 #define AX_MEDIUM_TFC		0x0020
 #define AX_MEDIUM_RFC		0x0010
 #define AX_MEDIUM_ENCK		0x0008
 #define AX_MEDIUM_AC		0x0004
 #define AX_MEDIUM_FD		0x0002
 #define AX_MEDIUM_GM		0x0001
 #define AX_MEDIUM_SM		0x1000
 #define AX_MEDIUM_SBP		0x0800
 #define AX_MEDIUM_PS		0x0200
 #define AX_MEDIUM_RE		0x0100

 #define AX88178_MEDIUM_DEFAULT	\
 	(AX_MEDIUM_PS | AX_MEDIUM_FD | AX_MEDIUM_AC | \
 	 AX_MEDIUM_RFC | AX_MEDIUM_TFC | AX_MEDIUM_JFE | \
 	 AX_MEDIUM_RE)

 #define AX88772_MEDIUM_DEFAULT	\
 	(AX_MEDIUM_FD | AX_MEDIUM_RFC | \
 	 AX_MEDIUM_TFC | AX_MEDIUM_PS | \
 	 AX_MEDIUM_AC | AX_MEDIUM_RE)

 /* AX88772 & AX88178 RX_CTL values */
 #define AX_RX_CTL_SO			0x0080
 #define AX_RX_CTL_AB			0x0008

 #define AX_DEFAULT_RX_CTL	\
 	(AX_RX_CTL_SO | AX_RX_CTL_AB)

 /* GPIO 2 toggles */
 #define AX_GPIO_GPO2EN		0x10	/* GPIO2 Output enable */
 #define AX_GPIO_GPO_2		0x20	/* GPIO2 Output value */
 #define AX_GPIO_RSE		0x80	/* Reload serial EEPROM */

 /* local defines */
 #define ASIX_BASE_NAME "asx"
 #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

 /* local vars */
 static int curr_eth_dev; /* index for name of next device detected */

 /*
  * Asix infrastructure commands
  */
 static int asix_write_cmd(struct ueth_data *dev, u8 cmd, u16 value, u16 index,
 			     u16 size, void *data)
 {
 	int len;

 	debug("asix_write_cmd() cmd=0x%02x value=0x%04x index=0x%04x "
 		"size=%d\n", cmd, value, index, size);

 	len = usb_control_msg(
 		dev->pusb_dev,
 		usb_sndctrlpipe(dev->pusb_dev, 0),
 		cmd,
 		USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 		value,
 		index,
 		data,
 		size,
 		USB_CTRL_SET_TIMEOUT);

 	return len == size ? 0 : -1;
 }

 static int asix_read_cmd(struct ueth_data *dev, u8 cmd, u16 value, u16 index,
 			    u16 size, void *data)
 {
 	int len;

 	debug("asix_read_cmd() cmd=0x%02x value=0x%04x index=0x%04x size=%d\n",
 		cmd, value, index, size);

 	len = usb_control_msg(
 		dev->pusb_dev,
 		usb_rcvctrlpipe(dev->pusb_dev, 0),
 		cmd,
 		USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 		value,
 		index,
 		data,
 		size,
 		USB_CTRL_GET_TIMEOUT);
 	return len == size ? 0 : -1;
 }

 static inline int asix_set_sw_mii(struct ueth_data *dev)
 {
 	int ret;

 	ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
 	if (ret < 0)
 		debug("Failed to enable software MII access\n");
 	return ret;
 }

 static inline int asix_set_hw_mii(struct ueth_data *dev)
 {
 	int ret;

 	ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
 	if (ret < 0)
 		debug("Failed to enable hardware MII access\n");
 	return ret;
 }

 static int asix_mdio_read(struct ueth_data *dev, int phy_id, int loc)
 {
 	__le16 res;

 	asix_set_sw_mii(dev);
 	asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id, (__u16)loc, 2, &res);
 	asix_set_hw_mii(dev);

 	debug("asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
 			phy_id, loc, le16_to_cpu(res));

 	return le16_to_cpu(res);
 }

 static void
 asix_mdio_write(struct ueth_data *dev, int phy_id, int loc, int val)
 {
 	__le16 res = cpu_to_le16(val);

 	debug("asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
 			phy_id, loc, val);
 	asix_set_sw_mii(dev);
 	asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
 	asix_set_hw_mii(dev);
 }

 /*
  * Asix "high level" commands
  */
 static int asix_sw_reset(struct ueth_data *dev, u8 flags)
 {
 	int ret;

 	ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
 	if (ret < 0)
 		debug("Failed to send software reset: %02x\n", ret);
 	else
 		udelay(150 * 1000);

 	return ret;
 }

 static inline int asix_get_phy_addr(struct ueth_data *dev)
 {
 	u8 buf[2];
 	int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);

 	debug("asix_get_phy_addr()\n");

 	if (ret < 0) {
 		debug("Error reading PHYID register: %02x\n", ret);
 		goto out;
 	}
 	debug("asix_get_phy_addr() returning 0x%02x%02x\n", buf[0], buf[1]);
 	ret = buf[1];

 out:
 	return ret;
 }

 static int asix_write_medium_mode(struct ueth_data *dev, u16 mode)
 {
 	int ret;

 	debug("asix_write_medium_mode() - mode = 0x%04x\n", mode);
 	ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE, mode,
 			0, 0, NULL);
 	if (ret < 0) {
 		debug("Failed to write Medium Mode mode to 0x%04x: %02x\n",
 			mode, ret);
 	}
 	return ret;
 }

 static u16 asix_read_rx_ctl(struct ueth_data *dev)
 {
 	__le16 v;
 	int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);

 	if (ret < 0)
 		debug("Error reading RX_CTL register: %02x\n", ret);
 	else
 		ret = le16_to_cpu(v);
 	return ret;
 }

 static int asix_write_rx_ctl(struct ueth_data *dev, u16 mode)
 {
 	int ret;

 	debug("asix_write_rx_ctl() - mode = 0x%04x\n", mode);
 	ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
 	if (ret < 0) {
 		debug("Failed to write RX_CTL mode to 0x%04x: %02x\n",
 				mode, ret);
 	}
 	return ret;
 }

 static int asix_write_gpio(struct ueth_data *dev, u16 value, int sleep)
 {
 	int ret;

 	debug("asix_write_gpio() - value = 0x%04x\n", value);
 	ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL);
 	if (ret < 0) {
 		debug("Failed to write GPIO value 0x%04x: %02x\n",
 			value, ret);
 	}
 	if (sleep)
 		udelay(sleep * 1000);

 	return ret;
 }

 /*
  * mii commands
  */

 /*
  * 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 = asix_mdio_read(dev, dev->phy_id, MII_BMCR);

 	if (bmcr & BMCR_ANENABLE) {
 		bmcr |= BMCR_ANRESTART;
 		asix_mdio_write(dev, dev->phy_id, MII_BMCR, bmcr);
 		r = 0;
 	}

 	return r;
 }

 /*
  * Asix callbacks
  */
 static int asix_init(struct eth_device *eth, bd_t *bd)
 {
 	int embd_phy;
 	unsigned char buf[ETH_ALEN];
 	u16 rx_ctl;
 	struct ueth_data	*dev = (struct ueth_data *)eth->priv;
 	int timeout = 0;
 #define TIMEOUT_RESOLUTION 50	/* ms */
 	int link_detected;

 	debug("** %s()\n", __func__);

 	if (asix_write_gpio(dev,
 			AX_GPIO_RSE | AX_GPIO_GPO_2 | AX_GPIO_GPO2EN, 5) < 0)
 		goto out_err;

 	/* 0x10 is the phy id of the embedded 10/100 ethernet phy */
 	embd_phy = ((asix_get_phy_addr(dev) & 0x1f) == 0x10 ? 1 : 0);
 	if (asix_write_cmd(dev, AX_CMD_SW_PHY_SELECT,
 				embd_phy, 0, 0, NULL) < 0) {
 		debug("Select PHY #1 failed\n");
 		goto out_err;
 	}

 	if (asix_sw_reset(dev, AX_SWRESET_IPPD | AX_SWRESET_PRL) < 0)
 		goto out_err;

 	if (asix_sw_reset(dev, AX_SWRESET_CLEAR) < 0)
 		goto out_err;

 	if (embd_phy) {
 		if (asix_sw_reset(dev, AX_SWRESET_IPRL) < 0)
 			goto out_err;
 	} else {
 		if (asix_sw_reset(dev, AX_SWRESET_PRTE) < 0)
 			goto out_err;
 	}

 	rx_ctl = asix_read_rx_ctl(dev);
 	debug("RX_CTL is 0x%04x after software reset\n", rx_ctl);
 	if (asix_write_rx_ctl(dev, 0x0000) < 0)
 		goto out_err;

 	rx_ctl = asix_read_rx_ctl(dev);
 	debug("RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);

 	/* Get the MAC address */
 	if (asix_read_cmd(dev, AX_CMD_READ_NODE_ID,
 				0, 0, ETH_ALEN, buf) < 0) {
 		debug("Failed to read MAC address.\n");
 		goto out_err;
 	}
 	memcpy(eth->enetaddr, buf, ETH_ALEN);
 	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->phy_id = asix_get_phy_addr(dev);
 	if (dev->phy_id < 0)
 		debug("Failed to read phy id\n");

 	if (asix_sw_reset(dev, AX_SWRESET_PRL) < 0)
 		goto out_err;

 	if (asix_sw_reset(dev, AX_SWRESET_IPRL | AX_SWRESET_PRL) < 0)
 		goto out_err;

 	asix_mdio_write(dev, dev->phy_id, MII_BMCR, BMCR_RESET);
 	asix_mdio_write(dev, dev->phy_id, MII_ADVERTISE,
 			ADVERTISE_ALL | ADVERTISE_CSMA);
 	mii_nway_restart(dev);

 	if (asix_write_medium_mode(dev, AX88772_MEDIUM_DEFAULT) < 0)
 		goto out_err;

 	if (asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
 				AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
 				AX88772_IPG2_DEFAULT, 0, NULL) < 0) {
 		debug("Write IPG,IPG1,IPG2 failed\n");
 		goto out_err;
 	}

 	if (asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL) < 0)
 		goto out_err;

 	do {
 		link_detected = asix_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");
 		goto out_err;
 	}

 	return 0;
 out_err:
 	return -1;
 }

 static int asix_send(struct eth_device *eth, void *packet, int length)
 {
 	struct ueth_data *dev = (struct ueth_data *)eth->priv;
 	int err;
 	u32 packet_len;
 	int actual_len;
 	unsigned char msg[PKTSIZE + sizeof(packet_len)];

 	debug("** %s(), len %d\n", __func__, length);

 	packet_len = (((length) ^ 0x0000ffff) << 16) + (length);
 	cpu_to_le32s(&packet_len);

 	memcpy(msg, &packet_len, sizeof(packet_len));
 	memcpy(msg + sizeof(packet_len), (void *)packet, length);
 	if (length & 1)
 		length++;

 	err = usb_bulk_msg(dev->pusb_dev,
 				usb_sndbulkpipe(dev->pusb_dev, dev->ep_out),
 				(void *)msg,
 				length + sizeof(packet_len),
 				&actual_len,
 				USB_BULK_SEND_TIMEOUT);
 	debug("Tx: len = %u, actual = %u, err = %d\n",
 			length + sizeof(packet_len), actual_len, err);

 	return err;
 }

 static int asix_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;

 	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 as two
 		 * complementary 16-bit words. Extract the length of the data.
 		 */
 		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 >> 16) ^ 0xffff) != (packet_len & 0xffff)) {
 			debug("Rx: malformed packet length: %#x (%#x:%#x)\n",
 			      packet_len, (packet_len >> 16) ^ 0xffff,
 			      packet_len & 0xffff);
 			return -1;
 		}
 		packet_len = packet_len & 0xffff;
 		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);

 		/* Adjust for next iteration. Packets are padded to 16-bits */
 		if (packet_len & 1)
 			packet_len++;
 		actual_len -= sizeof(packet_len) + packet_len;
 		buf_ptr += sizeof(packet_len) + packet_len;
 	}

 	return err;
 }

 static void asix_halt(struct eth_device *eth)
 {
 	debug("** %s()\n", __func__);
 }

 /*
  * Asix probing functions
  */
 void asix_eth_before_probe(void)
 {
 	curr_eth_dev = 0;
 }

 struct asix_dongle {
 	unsigned short vendor;
 	unsigned short product;
 };

 static struct asix_dongle asix_dongles[] = {
 	{ 0x05ac, 0x1402 },	/* Apple USB Ethernet Adapter */
 	{ 0x07d1, 0x3c05 },	/* D-Link DUB-E100 H/W Ver B1 */
 	{ 0x0b95, 0x772a },	/* Cables-to-Go USB Ethernet Adapter */
 	{ 0x0b95, 0x7720 },	/* Trendnet TU2-ET100 V3.0R */
 	{ 0x0b95, 0x1720 },	/* SMC */
 	{ 0x0db0, 0xa877 },	/* MSI - ASIX 88772a */
 	{ 0x13b1, 0x0018 },	/* Linksys 200M v2.1 */
 	{ 0x1557, 0x7720 },	/* 0Q0 cable ethernet */
 	{ 0x2001, 0x3c05 },	/* DLink DUB-E100 H/W Ver B1 Alternate */
 	{ 0x0000, 0x0000 }	/* END - Do not remove */
 };

 /* Probe to see if a new device is actually an asix device */
 int asix_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; asix_dongles[i].vendor != 0; i++) {
 		if (dev->descriptor.idVendor == asix_dongles[i].vendor &&
 		    dev->descriptor.idProduct == asix_dongles[i].product)
 			/* Found a supported dongle */
 			break;
 	}

 	if (asix_dongles[i].vendor == 0)
 		return 0;

 	memset(ss, 0, sizeof(struct ueth_data));

 	/* At this point, we know we've got a live one */
 	debug("\n\nUSB Ethernet device detected: %#04x:%#04x\n",
 	      dev->descriptor.idVendor, dev->descriptor.idProduct);

 	/* 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 asix_eth_get_info(struct usb_device *dev, struct ueth_data *ss,
 				struct eth_device *eth)
 {
 	if (!eth) {
 		debug("%s: missing parameter.\n", __func__);
 		return 0;
 	}
 	sprintf(eth->name, "%s%d", ASIX_BASE_NAME, curr_eth_dev++);
 	eth->init = asix_init;
 	eth->send = asix_send;
 	eth->recv = asix_recv;
 	eth->halt = asix_halt;
 	eth->priv = ss;

 	return 1;
 }
	/*
	* Copyright (c) 2011 The Chromium OS Authors.
	* 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"


	/* ASIX AX8817X based USB 2.0 Ethernet Devices */

	#define AX_CMD_SET_SW_MII 0x06
	#define AX_CMD_READ_MII_REG 0x07
	#define AX_CMD_WRITE_MII_REG 0x08
	#define AX_CMD_SET_HW_MII 0x0a
	#define AX_CMD_READ_RX_CTL 0x0f
	#define AX_CMD_WRITE_RX_CTL 0x10
	#define AX_CMD_WRITE_IPG0 0x12
	#define AX_CMD_READ_NODE_ID 0x13
	#define AX_CMD_READ_PHY_ID 0x19
	#define AX_CMD_WRITE_MEDIUM_MODE 0x1b
	#define AX_CMD_WRITE_GPIOS 0x1f
	#define AX_CMD_SW_RESET 0x20
	#define AX_CMD_SW_PHY_SELECT 0x22

	#define AX_SWRESET_CLEAR 0x00
	#define AX_SWRESET_PRTE 0x04
	#define AX_SWRESET_PRL 0x08
	#define AX_SWRESET_IPRL 0x20
	#define AX_SWRESET_IPPD 0x40

	#define AX88772_IPG0_DEFAULT 0x15
	#define AX88772_IPG1_DEFAULT 0x0c
	#define AX88772_IPG2_DEFAULT 0x12

	/* AX88772 & AX88178 Medium Mode Register */
	#define AX_MEDIUM_PF 0x0080
	#define AX_MEDIUM_JFE 0x0040
	#define AX_MEDIUM_TFC 0x0020
	#define AX_MEDIUM_RFC 0x0010
	#define AX_MEDIUM_ENCK 0x0008
	#define AX_MEDIUM_AC 0x0004
	#define AX_MEDIUM_FD 0x0002
	#define AX_MEDIUM_GM 0x0001
	#define AX_MEDIUM_SM 0x1000
	#define AX_MEDIUM_SBP 0x0800
	#define AX_MEDIUM_PS 0x0200
	#define AX_MEDIUM_RE 0x0100

	#define AX88178_MEDIUM_DEFAULT \
	(AX_MEDIUM_PS \| AX_MEDIUM_FD \| AX_MEDIUM_AC \| \
	AX_MEDIUM_RFC \| AX_MEDIUM_TFC \| AX_MEDIUM_JFE \| \
	AX_MEDIUM_RE)

	#define AX88772_MEDIUM_DEFAULT \
	(AX_MEDIUM_FD \| AX_MEDIUM_RFC \| \
	AX_MEDIUM_TFC \| AX_MEDIUM_PS \| \
	AX_MEDIUM_AC \| AX_MEDIUM_RE)

	/* AX88772 & AX88178 RX_CTL values */
	#define AX_RX_CTL_SO 0x0080
	#define AX_RX_CTL_AB 0x0008

	#define AX_DEFAULT_RX_CTL \
	(AX_RX_CTL_SO \| AX_RX_CTL_AB)

	/* GPIO 2 toggles */
	#define AX_GPIO_GPO2EN 0x10 /* GPIO2 Output enable */
	#define AX_GPIO_GPO_2 0x20 /* GPIO2 Output value */
	#define AX_GPIO_RSE 0x80 /* Reload serial EEPROM */

	/* local defines */
	#define ASIX_BASE_NAME "asx"
	#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

	/* local vars */
	static int curr_eth_dev; /* index for name of next device detected */

	/*
	* Asix infrastructure commands
	*/
	static int asix_write_cmd(struct ueth_data *dev, u8 cmd, u16 value, u16 index,
	u16 size, void *data)
	{
	int len;

	debug("asix_write_cmd() cmd=0x%02x value=0x%04x index=0x%04x "
	"size=%d\n", cmd, value, index, size);

	len = usb_control_msg(
	dev->pusb_dev,
	usb_sndctrlpipe(dev->pusb_dev, 0),
	cmd,
	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value,
	index,
	data,
	size,
	USB_CTRL_SET_TIMEOUT);

	return len == size ? 0 : -1;
	}

	static int asix_read_cmd(struct ueth_data *dev, u8 cmd, u16 value, u16 index,
	u16 size, void *data)
	{
	int len;

	debug("asix_read_cmd() cmd=0x%02x value=0x%04x index=0x%04x size=%d\n",
	cmd, value, index, size);

	len = usb_control_msg(
	dev->pusb_dev,
	usb_rcvctrlpipe(dev->pusb_dev, 0),
	cmd,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value,
	index,
	data,
	size,
	USB_CTRL_GET_TIMEOUT);
	return len == size ? 0 : -1;
	}

	static inline int asix_set_sw_mii(struct ueth_data *dev)
	{
	int ret;

	ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
	if (ret < 0)
	debug("Failed to enable software MII access\n");
	return ret;
	}

	static inline int asix_set_hw_mii(struct ueth_data *dev)
	{
	int ret;

	ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
	if (ret < 0)
	debug("Failed to enable hardware MII access\n");
	return ret;
	}

	static int asix_mdio_read(struct ueth_data *dev, int phy_id, int loc)
	{
	__le16 res;

	asix_set_sw_mii(dev);
	asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id, (__u16)loc, 2, &res);
	asix_set_hw_mii(dev);

	debug("asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
	phy_id, loc, le16_to_cpu(res));

	return le16_to_cpu(res);
	}

	static void
	asix_mdio_write(struct ueth_data *dev, int phy_id, int loc, int val)
	{
	__le16 res = cpu_to_le16(val);

	debug("asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
	phy_id, loc, val);
	asix_set_sw_mii(dev);
	asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
	asix_set_hw_mii(dev);
	}

	/*
	* Asix "high level" commands
	*/
	static int asix_sw_reset(struct ueth_data *dev, u8 flags)
	{
	int ret;

	ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
	if (ret < 0)
	debug("Failed to send software reset: %02x\n", ret);
	else
	udelay(150 * 1000);

	return ret;
	}

	static inline int asix_get_phy_addr(struct ueth_data *dev)
	{
	u8 buf[2];
	int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);

	debug("asix_get_phy_addr()\n");

	if (ret < 0) {
	debug("Error reading PHYID register: %02x\n", ret);
	goto out;
	}
	debug("asix_get_phy_addr() returning 0x%02x%02x\n", buf[0], buf[1]);
	ret = buf[1];

	out:
	return ret;
	}

	static int asix_write_medium_mode(struct ueth_data *dev, u16 mode)
	{
	int ret;

	debug("asix_write_medium_mode() - mode = 0x%04x\n", mode);
	ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE, mode,
	0, 0, NULL);
	if (ret < 0) {
	debug("Failed to write Medium Mode mode to 0x%04x: %02x\n",
	mode, ret);
	}
	return ret;
	}

	static u16 asix_read_rx_ctl(struct ueth_data *dev)
	{
	__le16 v;
	int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);

	if (ret < 0)
	debug("Error reading RX_CTL register: %02x\n", ret);
	else
	ret = le16_to_cpu(v);
	return ret;
	}

	static int asix_write_rx_ctl(struct ueth_data *dev, u16 mode)
	{
	int ret;

	debug("asix_write_rx_ctl() - mode = 0x%04x\n", mode);
	ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
	if (ret < 0) {
	debug("Failed to write RX_CTL mode to 0x%04x: %02x\n",
	mode, ret);
	}
	return ret;
	}

	static int asix_write_gpio(struct ueth_data *dev, u16 value, int sleep)
	{
	int ret;

	debug("asix_write_gpio() - value = 0x%04x\n", value);
	ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL);
	if (ret < 0) {
	debug("Failed to write GPIO value 0x%04x: %02x\n",
	value, ret);
	}
	if (sleep)
	udelay(sleep * 1000);

	return ret;
	}

	/*
	* mii commands
	*/

	/*
	* 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 = asix_mdio_read(dev, dev->phy_id, MII_BMCR);

	if (bmcr & BMCR_ANENABLE) {
	bmcr \|= BMCR_ANRESTART;
	asix_mdio_write(dev, dev->phy_id, MII_BMCR, bmcr);
	r = 0;
	}

	return r;
	}

	/*
	* Asix callbacks
	*/
	static int asix_init(struct eth_device eth, bd_t bd)
	{
	int embd_phy;
	unsigned char buf[ETH_ALEN];
	u16 rx_ctl;
	struct ueth_data dev = (struct ueth_data )eth->priv;
	int timeout = 0;
	#define TIMEOUT_RESOLUTION 50 /* ms */
	int link_detected;

	debug("** %s()\n", __func__);

	if (asix_write_gpio(dev,
	AX_GPIO_RSE \| AX_GPIO_GPO_2 \| AX_GPIO_GPO2EN, 5) < 0)
	goto out_err;

	/* 0x10 is the phy id of the embedded 10/100 ethernet phy */
	embd_phy = ((asix_get_phy_addr(dev) & 0x1f) == 0x10 ? 1 : 0);
	if (asix_write_cmd(dev, AX_CMD_SW_PHY_SELECT,
	embd_phy, 0, 0, NULL) < 0) {
	debug("Select PHY #1 failed\n");
	goto out_err;
	}

	if (asix_sw_reset(dev, AX_SWRESET_IPPD \| AX_SWRESET_PRL) < 0)
	goto out_err;

	if (asix_sw_reset(dev, AX_SWRESET_CLEAR) < 0)
	goto out_err;

	if (embd_phy) {
	if (asix_sw_reset(dev, AX_SWRESET_IPRL) < 0)
	goto out_err;
	} else {
	if (asix_sw_reset(dev, AX_SWRESET_PRTE) < 0)
	goto out_err;
	}

	rx_ctl = asix_read_rx_ctl(dev);
	debug("RX_CTL is 0x%04x after software reset\n", rx_ctl);
	if (asix_write_rx_ctl(dev, 0x0000) < 0)
	goto out_err;

	rx_ctl = asix_read_rx_ctl(dev);
	debug("RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);

	/* Get the MAC address */
	if (asix_read_cmd(dev, AX_CMD_READ_NODE_ID,
	0, 0, ETH_ALEN, buf) < 0) {
	debug("Failed to read MAC address.\n");
	goto out_err;
	}
	memcpy(eth->enetaddr, buf, ETH_ALEN);
	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->phy_id = asix_get_phy_addr(dev);
	if (dev->phy_id < 0)
	debug("Failed to read phy id\n");

	if (asix_sw_reset(dev, AX_SWRESET_PRL) < 0)
	goto out_err;

	if (asix_sw_reset(dev, AX_SWRESET_IPRL \| AX_SWRESET_PRL) < 0)
	goto out_err;

	asix_mdio_write(dev, dev->phy_id, MII_BMCR, BMCR_RESET);
	asix_mdio_write(dev, dev->phy_id, MII_ADVERTISE,
	ADVERTISE_ALL \| ADVERTISE_CSMA);
	mii_nway_restart(dev);

	if (asix_write_medium_mode(dev, AX88772_MEDIUM_DEFAULT) < 0)
	goto out_err;

	if (asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
	AX88772_IPG0_DEFAULT \| AX88772_IPG1_DEFAULT,
	AX88772_IPG2_DEFAULT, 0, NULL) < 0) {
	debug("Write IPG,IPG1,IPG2 failed\n");
	goto out_err;
	}

	if (asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL) < 0)
	goto out_err;

	do {
	link_detected = asix_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");
	goto out_err;
	}

	return 0;
	out_err:
	return -1;
	}

	static int asix_send(struct eth_device eth, void packet, int length)
	{
	struct ueth_data dev = (struct ueth_data )eth->priv;
	int err;
	u32 packet_len;
	int actual_len;
	unsigned char msg[PKTSIZE + sizeof(packet_len)];

	debug("** %s(), len %d\n", __func__, length);

	packet_len = (((length) ^ 0x0000ffff) << 16) + (length);
	cpu_to_le32s(&packet_len);

	memcpy(msg, &packet_len, sizeof(packet_len));
	memcpy(msg + sizeof(packet_len), (void *)packet, length);
	if (length & 1)
	length++;

	err = usb_bulk_msg(dev->pusb_dev,
	usb_sndbulkpipe(dev->pusb_dev, dev->ep_out),
	(void *)msg,
	length + sizeof(packet_len),
	&actual_len,
	USB_BULK_SEND_TIMEOUT);
	debug("Tx: len = %u, actual = %u, err = %d\n",
	length + sizeof(packet_len), actual_len, err);

	return err;
	}

	static int asix_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;

	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 as two
	* complementary 16-bit words. Extract the length of the data.
	*/
	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 >> 16) ^ 0xffff) != (packet_len & 0xffff)) {
	debug("Rx: malformed packet length: %#x (%#x:%#x)\n",
	packet_len, (packet_len >> 16) ^ 0xffff,
	packet_len & 0xffff);
	return -1;
	}
	packet_len = packet_len & 0xffff;
	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);

	/* Adjust for next iteration. Packets are padded to 16-bits */
	if (packet_len & 1)
	packet_len++;
	actual_len -= sizeof(packet_len) + packet_len;
	buf_ptr += sizeof(packet_len) + packet_len;
	}

	return err;
	}

	static void asix_halt(struct eth_device *eth)
	{
	debug("** %s()\n", __func__);
	}

	/*
	* Asix probing functions
	*/
	void asix_eth_before_probe(void)
	{
	curr_eth_dev = 0;
	}

	struct asix_dongle {
	unsigned short vendor;
	unsigned short product;
	};

	static struct asix_dongle asix_dongles[] = {
	{ 0x05ac, 0x1402 }, /* Apple USB Ethernet Adapter */
	{ 0x07d1, 0x3c05 }, /* D-Link DUB-E100 H/W Ver B1 */
	{ 0x0b95, 0x772a }, /* Cables-to-Go USB Ethernet Adapter */
	{ 0x0b95, 0x7720 }, /* Trendnet TU2-ET100 V3.0R */
	{ 0x0b95, 0x1720 }, /* SMC */
	{ 0x0db0, 0xa877 }, /* MSI - ASIX 88772a */
	{ 0x13b1, 0x0018 }, /* Linksys 200M v2.1 */
	{ 0x1557, 0x7720 }, /* 0Q0 cable ethernet */
	{ 0x2001, 0x3c05 }, /* DLink DUB-E100 H/W Ver B1 Alternate */
	{ 0x0000, 0x0000 } /* END - Do not remove */
	};

	/* Probe to see if a new device is actually an asix device */
	int asix_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; asix_dongles[i].vendor != 0; i++) {
	if (dev->descriptor.idVendor == asix_dongles[i].vendor &&
	dev->descriptor.idProduct == asix_dongles[i].product)
	/* Found a supported dongle */
	break;
	}

	if (asix_dongles[i].vendor == 0)
	return 0;

	memset(ss, 0, sizeof(struct ueth_data));

	/* At this point, we know we've got a live one */
	debug("\n\nUSB Ethernet device detected: %#04x:%#04x\n",
	dev->descriptor.idVendor, dev->descriptor.idProduct);

	/* 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 asix_eth_get_info(struct usb_device dev, struct ueth_data ss,
	struct eth_device *eth)
	{
	if (!eth) {
	debug("%s: missing parameter.\n", __func__);
	return 0;
	}
	sprintf(eth->name, "%s%d", ASIX_BASE_NAME, curr_eth_dev++);
	eth->init = asix_init;
	eth->send = asix_send;
	eth->recv = asix_recv;
	eth->halt = asix_halt;
	eth->priv = ss;

	return 1;
	}