drivers/net/usb/sr9800.c - third_party/linux - Git at Google

 /* CoreChip-sz SR9800 one chip USB 2.0 Ethernet Devices
  *
  * Author : Liu Junliang <liujunliang_ljl@163.com>
  *
  * Based on asix_common.c, asix_devices.c
  *
  * This file is licensed under the terms of the GNU General Public License
  * version 2.  This program is licensed "as is" without any warranty of any
  * kind, whether express or implied.*
  */

 #include <linux/module.h>
 #include <linux/kmod.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/workqueue.h>
 #include <linux/mii.h>
 #include <linux/usb.h>
 #include <linux/crc32.h>
 #include <linux/usb/usbnet.h>
 #include <linux/slab.h>
 #include <linux/if_vlan.h>

 #include "sr9800.h"

 static int sr_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
 			    u16 size, void *data)
 {
 	int err;

 	err = usbnet_read_cmd(dev, cmd, SR_REQ_RD_REG, value, index,
 			      data, size);
 	if ((err != size) && (err >= 0))
 		err = -EINVAL;

 	return err;
 }

 static int sr_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
 			     u16 size, void *data)
 {
 	int err;

 	err = usbnet_write_cmd(dev, cmd, SR_REQ_WR_REG, value, index,
 			      data, size);
 	if ((err != size) && (err >= 0))
 		err = -EINVAL;

 	return err;
 }

 static void
 sr_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
 		   u16 size, void *data)
 {
 	usbnet_write_cmd_async(dev, cmd, SR_REQ_WR_REG, value, index, data,
 			       size);
 }

 static int sr_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 {
 	int offset = 0;

 	/* This check is no longer done by usbnet */
 	if (skb->len < dev->net->hard_header_len)
 		return 0;

 	while (offset + sizeof(u32) < skb->len) {
 		struct sk_buff *sr_skb;
 		u16 size;
 		u32 header = get_unaligned_le32(skb->data + offset);

 		offset += sizeof(u32);
 		/* get the packet length */
 		size = (u16) (header & 0x7ff);
 		if (size != ((~header >> 16) & 0x07ff)) {
 			netdev_err(dev->net, "%s : Bad Header Length\n",
 				   __func__);
 			return 0;
 		}

 		if ((size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) ||
 		    (size + offset > skb->len)) {
 			netdev_err(dev->net, "%s : Bad RX Length %d\n",
 				   __func__, size);
 			return 0;
 		}
 		sr_skb = netdev_alloc_skb_ip_align(dev->net, size);
 		if (!sr_skb)
 			return 0;

 		skb_put(sr_skb, size);
 		memcpy(sr_skb->data, skb->data + offset, size);
 		usbnet_skb_return(dev, sr_skb);

 		offset += (size + 1) & 0xfffe;
 	}

 	if (skb->len != offset) {
 		netdev_err(dev->net, "%s : Bad SKB Length %d\n", __func__,
 			   skb->len);
 		return 0;
 	}

 	return 1;
 }

 static struct sk_buff *sr_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
 					gfp_t flags)
 {
 	int headroom = skb_headroom(skb);
 	int tailroom = skb_tailroom(skb);
 	u32 padbytes = 0xffff0000;
 	u32 packet_len;
 	int padlen;
 	void *ptr;

 	padlen = ((skb->len + 4) % (dev->maxpacket - 1)) ? 0 : 4;

 	if ((!skb_cloned(skb)) && ((headroom + tailroom) >= (4 + padlen))) {
 		if ((headroom < 4) || (tailroom < padlen)) {
 			skb->data = memmove(skb->head + 4, skb->data,
 					    skb->len);
 			skb_set_tail_pointer(skb, skb->len);
 		}
 	} else {
 		struct sk_buff *skb2;
 		skb2 = skb_copy_expand(skb, 4, padlen, flags);
 		dev_kfree_skb_any(skb);
 		skb = skb2;
 		if (!skb)
 			return NULL;
 	}

 	ptr = skb_push(skb, 4);
 	packet_len = (((skb->len - 4) ^ 0x0000ffff) << 16) + (skb->len - 4);
 	put_unaligned_le32(packet_len, ptr);

 	if (padlen) {
 		put_unaligned_le32(padbytes, skb_tail_pointer(skb));
 		skb_put(skb, sizeof(padbytes));
 	}

 	usbnet_set_skb_tx_stats(skb, 1, 0);
 	return skb;
 }

 static void sr_status(struct usbnet *dev, struct urb *urb)
 {
 	struct sr9800_int_data *event;
 	int link;

 	if (urb->actual_length < 8)
 		return;

 	event = urb->transfer_buffer;
 	link = event->link & 0x01;
 	if (netif_carrier_ok(dev->net) != link) {
 		usbnet_link_change(dev, link, 1);
 		netdev_dbg(dev->net, "Link Status is: %d\n", link);
 	}

 	return;
 }

 static inline int sr_set_sw_mii(struct usbnet *dev)
 {
 	int ret;

 	ret = sr_write_cmd(dev, SR_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
 	if (ret < 0)
 		netdev_err(dev->net, "Failed to enable software MII access\n");
 	return ret;
 }

 static inline int sr_set_hw_mii(struct usbnet *dev)
 {
 	int ret;

 	ret = sr_write_cmd(dev, SR_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
 	if (ret < 0)
 		netdev_err(dev->net, "Failed to enable hardware MII access\n");
 	return ret;
 }

 static inline int sr_get_phy_addr(struct usbnet *dev)
 {
 	u8 buf[2];
 	int ret;

 	ret = sr_read_cmd(dev, SR_CMD_READ_PHY_ID, 0, 0, 2, buf);
 	if (ret < 0) {
 		netdev_err(dev->net, "%s : Error reading PHYID register:%02x\n",
 			   __func__, ret);
 		goto out;
 	}
 	netdev_dbg(dev->net, "%s : returning 0x%04x\n", __func__,
 		   *((__le16 *)buf));

 	ret = buf[1];

 out:
 	return ret;
 }

 static int sr_sw_reset(struct usbnet *dev, u8 flags)
 {
 	int ret;

 	ret = sr_write_cmd(dev, SR_CMD_SW_RESET, flags, 0, 0, NULL);
 	if (ret < 0)
 		netdev_err(dev->net, "Failed to send software reset:%02x\n",
 			   ret);

 	return ret;
 }

 static u16 sr_read_rx_ctl(struct usbnet *dev)
 {
 	__le16 v;
 	int ret;

 	ret = sr_read_cmd(dev, SR_CMD_READ_RX_CTL, 0, 0, 2, &v);
 	if (ret < 0) {
 		netdev_err(dev->net, "Error reading RX_CTL register:%02x\n",
 			   ret);
 		goto out;
 	}

 	ret = le16_to_cpu(v);
 out:
 	return ret;
 }

 static int sr_write_rx_ctl(struct usbnet *dev, u16 mode)
 {
 	int ret;

 	netdev_dbg(dev->net, "%s : mode = 0x%04x\n", __func__, mode);
 	ret = sr_write_cmd(dev, SR_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
 	if (ret < 0)
 		netdev_err(dev->net,
 			   "Failed to write RX_CTL mode to 0x%04x:%02x\n",
 			   mode, ret);

 	return ret;
 }

 static u16 sr_read_medium_status(struct usbnet *dev)
 {
 	__le16 v;
 	int ret;

 	ret = sr_read_cmd(dev, SR_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);
 	if (ret < 0) {
 		netdev_err(dev->net,
 			   "Error reading Medium Status register:%02x\n", ret);
 		return ret;	/* TODO: callers not checking for error ret */
 	}

 	return le16_to_cpu(v);
 }

 static int sr_write_medium_mode(struct usbnet *dev, u16 mode)
 {
 	int ret;

 	netdev_dbg(dev->net, "%s : mode = 0x%04x\n", __func__, mode);
 	ret = sr_write_cmd(dev, SR_CMD_WRITE_MEDIUM_MODE, mode, 0, 0, NULL);
 	if (ret < 0)
 		netdev_err(dev->net,
 			   "Failed to write Medium Mode mode to 0x%04x:%02x\n",
 			   mode, ret);
 	return ret;
 }

 static int sr_write_gpio(struct usbnet *dev, u16 value, int sleep)
 {
 	int ret;

 	netdev_dbg(dev->net, "%s : value = 0x%04x\n", __func__, value);
 	ret = sr_write_cmd(dev, SR_CMD_WRITE_GPIOS, value, 0, 0, NULL);
 	if (ret < 0)
 		netdev_err(dev->net, "Failed to write GPIO value 0x%04x:%02x\n",
 			   value, ret);
 	if (sleep)
 		msleep(sleep);

 	return ret;
 }

 /* SR9800 have a 16-bit RX_CTL value */
 static void sr_set_multicast(struct net_device *net)
 {
 	struct usbnet *dev = netdev_priv(net);
 	struct sr_data *data = (struct sr_data *)&dev->data;
 	u16 rx_ctl = SR_DEFAULT_RX_CTL;

 	if (net->flags & IFF_PROMISC) {
 		rx_ctl |= SR_RX_CTL_PRO;
 	} else if (net->flags & IFF_ALLMULTI ||
 		   netdev_mc_count(net) > SR_MAX_MCAST) {
 		rx_ctl |= SR_RX_CTL_AMALL;
 	} else if (netdev_mc_empty(net)) {
 		/* just broadcast and directed */
 	} else {
 		/* We use the 20 byte dev->data
 		 * for our 8 byte filter buffer
 		 * to avoid allocating memory that
 		 * is tricky to free later
 		 */
 		struct netdev_hw_addr *ha;
 		u32 crc_bits;

 		memset(data->multi_filter, 0, SR_MCAST_FILTER_SIZE);

 		/* Build the multicast hash filter. */
 		netdev_for_each_mc_addr(ha, net) {
 			crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
 			data->multi_filter[crc_bits >> 3] |=
 			    1 << (crc_bits & 7);
 		}

 		sr_write_cmd_async(dev, SR_CMD_WRITE_MULTI_FILTER, 0, 0,
 				   SR_MCAST_FILTER_SIZE, data->multi_filter);

 		rx_ctl |= SR_RX_CTL_AM;
 	}

 	sr_write_cmd_async(dev, SR_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
 }

 static int sr_mdio_read(struct net_device *net, int phy_id, int loc)
 {
 	struct usbnet *dev = netdev_priv(net);
 	__le16 res = 0;

 	mutex_lock(&dev->phy_mutex);
 	sr_set_sw_mii(dev);
 	sr_read_cmd(dev, SR_CMD_READ_MII_REG, phy_id, (__u16)loc, 2, &res);
 	sr_set_hw_mii(dev);
 	mutex_unlock(&dev->phy_mutex);

 	netdev_dbg(dev->net,
 		   "%s : phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n", __func__,
 		   phy_id, loc, le16_to_cpu(res));

 	return le16_to_cpu(res);
 }

 static void
 sr_mdio_write(struct net_device *net, int phy_id, int loc, int val)
 {
 	struct usbnet *dev = netdev_priv(net);
 	__le16 res = cpu_to_le16(val);

 	netdev_dbg(dev->net,
 		   "%s : phy_id=0x%02x, loc=0x%02x, val=0x%04x\n", __func__,
 		   phy_id, loc, val);
 	mutex_lock(&dev->phy_mutex);
 	sr_set_sw_mii(dev);
 	sr_write_cmd(dev, SR_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
 	sr_set_hw_mii(dev);
 	mutex_unlock(&dev->phy_mutex);
 }

 /* Get the PHY Identifier from the PHYSID1 & PHYSID2 MII registers */
 static u32 sr_get_phyid(struct usbnet *dev)
 {
 	int phy_reg;
 	u32 phy_id;
 	int i;

 	/* Poll for the rare case the FW or phy isn't ready yet.  */
 	for (i = 0; i < 100; i++) {
 		phy_reg = sr_mdio_read(dev->net, dev->mii.phy_id, MII_PHYSID1);
 		if (phy_reg != 0 && phy_reg != 0xFFFF)
 			break;
 		mdelay(1);
 	}

 	if (phy_reg <= 0 || phy_reg == 0xFFFF)
 		return 0;

 	phy_id = (phy_reg & 0xffff) << 16;

 	phy_reg = sr_mdio_read(dev->net, dev->mii.phy_id, MII_PHYSID2);
 	if (phy_reg < 0)
 		return 0;

 	phy_id |= (phy_reg & 0xffff);

 	return phy_id;
 }

 static void
 sr_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 {
 	struct usbnet *dev = netdev_priv(net);
 	u8 opt;

 	if (sr_read_cmd(dev, SR_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
 		wolinfo->supported = 0;
 		wolinfo->wolopts = 0;
 		return;
 	}
 	wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
 	wolinfo->wolopts = 0;
 	if (opt & SR_MONITOR_LINK)
 		wolinfo->wolopts |= WAKE_PHY;
 	if (opt & SR_MONITOR_MAGIC)
 		wolinfo->wolopts |= WAKE_MAGIC;
 }

 static int
 sr_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 {
 	struct usbnet *dev = netdev_priv(net);
 	u8 opt = 0;

 	if (wolinfo->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
 		return -EINVAL;

 	if (wolinfo->wolopts & WAKE_PHY)
 		opt |= SR_MONITOR_LINK;
 	if (wolinfo->wolopts & WAKE_MAGIC)
 		opt |= SR_MONITOR_MAGIC;

 	if (sr_write_cmd(dev, SR_CMD_WRITE_MONITOR_MODE,
 			 opt, 0, 0, NULL) < 0)
 		return -EINVAL;

 	return 0;
 }

 static int sr_get_eeprom_len(struct net_device *net)
 {
 	struct usbnet *dev = netdev_priv(net);
 	struct sr_data *data = (struct sr_data *)&dev->data;

 	return data->eeprom_len;
 }

 static int sr_get_eeprom(struct net_device *net,
 			      struct ethtool_eeprom *eeprom, u8 *data)
 {
 	struct usbnet *dev = netdev_priv(net);
 	__le16 *ebuf = (__le16 *)data;
 	int ret;
 	int i;

 	/* Crude hack to ensure that we don't overwrite memory
 	 * if an odd length is supplied
 	 */
 	if (eeprom->len % 2)
 		return -EINVAL;

 	eeprom->magic = SR_EEPROM_MAGIC;

 	/* sr9800 returns 2 bytes from eeprom on read */
 	for (i = 0; i < eeprom->len / 2; i++) {
 		ret = sr_read_cmd(dev, SR_CMD_READ_EEPROM, eeprom->offset + i,
 				  0, 2, &ebuf[i]);
 		if (ret < 0)
 			return -EINVAL;
 	}
 	return 0;
 }

 static void sr_get_drvinfo(struct net_device *net,
 				 struct ethtool_drvinfo *info)
 {
 	/* Inherit standard device info */
 	usbnet_get_drvinfo(net, info);
 	strncpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 	strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
 }

 static u32 sr_get_link(struct net_device *net)
 {
 	struct usbnet *dev = netdev_priv(net);

 	return mii_link_ok(&dev->mii);
 }

 static int sr_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
 {
 	struct usbnet *dev = netdev_priv(net);

 	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 }

 static int sr_set_mac_address(struct net_device *net, void *p)
 {
 	struct usbnet *dev = netdev_priv(net);
 	struct sr_data *data = (struct sr_data *)&dev->data;
 	struct sockaddr *addr = p;

 	if (netif_running(net))
 		return -EBUSY;
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;

 	memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);

 	/* We use the 20 byte dev->data
 	 * for our 6 byte mac buffer
 	 * to avoid allocating memory that
 	 * is tricky to free later
 	 */
 	memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
 	sr_write_cmd_async(dev, SR_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 			   data->mac_addr);

 	return 0;
 }

 static const struct ethtool_ops sr9800_ethtool_ops = {
 	.get_drvinfo	= sr_get_drvinfo,
 	.get_link	= sr_get_link,
 	.get_msglevel	= usbnet_get_msglevel,
 	.set_msglevel	= usbnet_set_msglevel,
 	.get_wol	= sr_get_wol,
 	.set_wol	= sr_set_wol,
 	.get_eeprom_len	= sr_get_eeprom_len,
 	.get_eeprom	= sr_get_eeprom,
 	.nway_reset	= usbnet_nway_reset,
 	.get_link_ksettings	= usbnet_get_link_ksettings,
 	.set_link_ksettings	= usbnet_set_link_ksettings,
 };

 static int sr9800_link_reset(struct usbnet *dev)
 {
 	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 	u16 mode;

 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
 	mode = SR9800_MEDIUM_DEFAULT;

 	if (ethtool_cmd_speed(&ecmd) != SPEED_100)
 		mode &= ~SR_MEDIUM_PS;

 	if (ecmd.duplex != DUPLEX_FULL)
 		mode &= ~SR_MEDIUM_FD;

 	netdev_dbg(dev->net, "%s : speed: %u duplex: %d mode: 0x%04x\n",
 		   __func__, ethtool_cmd_speed(&ecmd), ecmd.duplex, mode);

 	sr_write_medium_mode(dev, mode);

 	return 0;
 }


 static int sr9800_set_default_mode(struct usbnet *dev)
 {
 	u16 rx_ctl;
 	int ret;

 	sr_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
 	sr_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
 		      ADVERTISE_ALL | ADVERTISE_CSMA);
 	mii_nway_restart(&dev->mii);

 	ret = sr_write_medium_mode(dev, SR9800_MEDIUM_DEFAULT);
 	if (ret < 0)
 		goto out;

 	ret = sr_write_cmd(dev, SR_CMD_WRITE_IPG012,
 				SR9800_IPG0_DEFAULT | SR9800_IPG1_DEFAULT,
 				SR9800_IPG2_DEFAULT, 0, NULL);
 	if (ret < 0) {
 		netdev_dbg(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret);
 		goto out;
 	}

 	/* Set RX_CTL to default values with 2k buffer, and enable cactus */
 	ret = sr_write_rx_ctl(dev, SR_DEFAULT_RX_CTL);
 	if (ret < 0)
 		goto out;

 	rx_ctl = sr_read_rx_ctl(dev);
 	netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n",
 		   rx_ctl);

 	rx_ctl = sr_read_medium_status(dev);
 	netdev_dbg(dev->net, "Medium Status:0x%04x after all initializations\n",
 		   rx_ctl);

 	return 0;
 out:
 	return ret;
 }

 static int sr9800_reset(struct usbnet *dev)
 {
 	struct sr_data *data = (struct sr_data *)&dev->data;
 	int ret, embd_phy;
 	u16 rx_ctl;

 	ret = sr_write_gpio(dev,
 			SR_GPIO_RSE | SR_GPIO_GPO_2 | SR_GPIO_GPO2EN, 5);
 	if (ret < 0)
 		goto out;

 	embd_phy = ((sr_get_phy_addr(dev) & 0x1f) == 0x10 ? 1 : 0);

 	ret = sr_write_cmd(dev, SR_CMD_SW_PHY_SELECT, embd_phy, 0, 0, NULL);
 	if (ret < 0) {
 		netdev_dbg(dev->net, "Select PHY #1 failed: %d\n", ret);
 		goto out;
 	}

 	ret = sr_sw_reset(dev, SR_SWRESET_IPPD | SR_SWRESET_PRL);
 	if (ret < 0)
 		goto out;

 	msleep(150);

 	ret = sr_sw_reset(dev, SR_SWRESET_CLEAR);
 	if (ret < 0)
 		goto out;

 	msleep(150);

 	if (embd_phy) {
 		ret = sr_sw_reset(dev, SR_SWRESET_IPRL);
 		if (ret < 0)
 			goto out;
 	} else {
 		ret = sr_sw_reset(dev, SR_SWRESET_PRTE);
 		if (ret < 0)
 			goto out;
 	}

 	msleep(150);
 	rx_ctl = sr_read_rx_ctl(dev);
 	netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
 	ret = sr_write_rx_ctl(dev, 0x0000);
 	if (ret < 0)
 		goto out;

 	rx_ctl = sr_read_rx_ctl(dev);
 	netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);

 	ret = sr_sw_reset(dev, SR_SWRESET_PRL);
 	if (ret < 0)
 		goto out;

 	msleep(150);

 	ret = sr_sw_reset(dev, SR_SWRESET_IPRL | SR_SWRESET_PRL);
 	if (ret < 0)
 		goto out;

 	msleep(150);

 	ret = sr9800_set_default_mode(dev);
 	if (ret < 0)
 		goto out;

 	/* Rewrite MAC address */
 	memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN);
 	ret = sr_write_cmd(dev, SR_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
 							data->mac_addr);
 	if (ret < 0)
 		goto out;

 	return 0;

 out:
 	return ret;
 }

 static const struct net_device_ops sr9800_netdev_ops = {
 	.ndo_open		= usbnet_open,
 	.ndo_stop		= usbnet_stop,
 	.ndo_start_xmit		= usbnet_start_xmit,
 	.ndo_tx_timeout		= usbnet_tx_timeout,
 	.ndo_change_mtu		= usbnet_change_mtu,
 	.ndo_get_stats64	= usbnet_get_stats64,
 	.ndo_set_mac_address	= sr_set_mac_address,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_do_ioctl		= sr_ioctl,
 	.ndo_set_rx_mode        = sr_set_multicast,
 };

 static int sr9800_phy_powerup(struct usbnet *dev)
 {
 	int ret;

 	/* set the embedded Ethernet PHY in power-down state */
 	ret = sr_sw_reset(dev, SR_SWRESET_IPPD | SR_SWRESET_IPRL);
 	if (ret < 0) {
 		netdev_err(dev->net, "Failed to power down PHY : %d\n", ret);
 		return ret;
 	}
 	msleep(20);

 	/* set the embedded Ethernet PHY in power-up state */
 	ret = sr_sw_reset(dev, SR_SWRESET_IPRL);
 	if (ret < 0) {
 		netdev_err(dev->net, "Failed to reset PHY: %d\n", ret);
 		return ret;
 	}
 	msleep(600);

 	/* set the embedded Ethernet PHY in reset state */
 	ret = sr_sw_reset(dev, SR_SWRESET_CLEAR);
 	if (ret < 0) {
 		netdev_err(dev->net, "Failed to power up PHY: %d\n", ret);
 		return ret;
 	}
 	msleep(20);

 	/* set the embedded Ethernet PHY in power-up state */
 	ret = sr_sw_reset(dev, SR_SWRESET_IPRL);
 	if (ret < 0) {
 		netdev_err(dev->net, "Failed to reset PHY: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int sr9800_bind(struct usbnet *dev, struct usb_interface *intf)
 {
 	struct sr_data *data = (struct sr_data *)&dev->data;
 	u16 led01_mux, led23_mux;
 	int ret, embd_phy;
 	u32 phyid;
 	u16 rx_ctl;

 	data->eeprom_len = SR9800_EEPROM_LEN;

 	ret = usbnet_get_endpoints(dev, intf);
 	if (ret)
 		goto out;

 	/* LED Setting Rule :
 	 * AABB:CCDD
 	 * AA : MFA0(LED0)
 	 * BB : MFA1(LED1)
 	 * CC : MFA2(LED2), Reserved for SR9800
 	 * DD : MFA3(LED3), Reserved for SR9800
 	 */
 	led01_mux = (SR_LED_MUX_LINK_ACTIVE << 8) | SR_LED_MUX_LINK;
 	led23_mux = (SR_LED_MUX_LINK_ACTIVE << 8) | SR_LED_MUX_TX_ACTIVE;
 	ret = sr_write_cmd(dev, SR_CMD_LED_MUX, led01_mux, led23_mux, 0, NULL);
 	if (ret < 0) {
 			netdev_err(dev->net, "set LINK LED failed : %d\n", ret);
 			goto out;
 	}

 	/* Get the MAC address */
 	ret = sr_read_cmd(dev, SR_CMD_READ_NODE_ID, 0, 0, ETH_ALEN,
 			  dev->net->dev_addr);
 	if (ret < 0) {
 		netdev_dbg(dev->net, "Failed to read MAC address: %d\n", ret);
 		return ret;
 	}
 	netdev_dbg(dev->net, "mac addr : %pM\n", dev->net->dev_addr);

 	/* Initialize MII structure */
 	dev->mii.dev = dev->net;
 	dev->mii.mdio_read = sr_mdio_read;
 	dev->mii.mdio_write = sr_mdio_write;
 	dev->mii.phy_id_mask = 0x1f;
 	dev->mii.reg_num_mask = 0x1f;
 	dev->mii.phy_id = sr_get_phy_addr(dev);

 	dev->net->netdev_ops = &sr9800_netdev_ops;
 	dev->net->ethtool_ops = &sr9800_ethtool_ops;

 	embd_phy = ((dev->mii.phy_id & 0x1f) == 0x10 ? 1 : 0);
 	/* Reset the PHY to normal operation mode */
 	ret = sr_write_cmd(dev, SR_CMD_SW_PHY_SELECT, embd_phy, 0, 0, NULL);
 	if (ret < 0) {
 		netdev_dbg(dev->net, "Select PHY #1 failed: %d\n", ret);
 		return ret;
 	}

 	/* Init PHY routine */
 	ret = sr9800_phy_powerup(dev);
 	if (ret < 0)
 		goto out;

 	rx_ctl = sr_read_rx_ctl(dev);
 	netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
 	ret = sr_write_rx_ctl(dev, 0x0000);
 	if (ret < 0)
 		goto out;

 	rx_ctl = sr_read_rx_ctl(dev);
 	netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);

 	/* Read PHYID register *AFTER* the PHY was reset properly */
 	phyid = sr_get_phyid(dev);
 	netdev_dbg(dev->net, "PHYID=0x%08x\n", phyid);

 	/* medium mode setting */
 	ret = sr9800_set_default_mode(dev);
 	if (ret < 0)
 		goto out;

 	if (dev->udev->speed == USB_SPEED_HIGH) {
 		ret = sr_write_cmd(dev, SR_CMD_BULKIN_SIZE,
 			SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_4K].byte_cnt,
 			SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_4K].threshold,
 			0, NULL);
 		if (ret < 0) {
 			netdev_err(dev->net, "Reset RX_CTL failed: %d\n", ret);
 			goto out;
 		}
 		dev->rx_urb_size =
 			SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_4K].size;
 	} else {
 		ret = sr_write_cmd(dev, SR_CMD_BULKIN_SIZE,
 			SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_2K].byte_cnt,
 			SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_2K].threshold,
 			0, NULL);
 		if (ret < 0) {
 			netdev_err(dev->net, "Reset RX_CTL failed: %d\n", ret);
 			goto out;
 		}
 		dev->rx_urb_size =
 			SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_2K].size;
 	}
 	netdev_dbg(dev->net, "%s : setting rx_urb_size with : %zu\n", __func__,
 		   dev->rx_urb_size);
 	return 0;

 out:
 	return ret;
 }

 static const struct driver_info sr9800_driver_info = {
 	.description	= "CoreChip SR9800 USB 2.0 Ethernet",
 	.bind		= sr9800_bind,
 	.status		= sr_status,
 	.link_reset	= sr9800_link_reset,
 	.reset		= sr9800_reset,
 	.flags		= DRIVER_FLAG,
 	.rx_fixup	= sr_rx_fixup,
 	.tx_fixup	= sr_tx_fixup,
 };

 static const struct usb_device_id	products[] = {
 	{
 		USB_DEVICE(0x0fe6, 0x9800),	/* SR9800 Device  */
 		.driver_info = (unsigned long) &sr9800_driver_info,
 	},
 	{},		/* END */
 };

 MODULE_DEVICE_TABLE(usb, products);

 static struct usb_driver sr_driver = {
 	.name		= DRIVER_NAME,
 	.id_table	= products,
 	.probe		= usbnet_probe,
 	.suspend	= usbnet_suspend,
 	.resume		= usbnet_resume,
 	.disconnect	= usbnet_disconnect,
 	.supports_autosuspend = 1,
 };

 module_usb_driver(sr_driver);

 MODULE_AUTHOR("Liu Junliang <liujunliang_ljl@163.com");
 MODULE_VERSION(DRIVER_VERSION);
 MODULE_DESCRIPTION("SR9800 USB 2.0 USB2NET Dev : http://www.corechip-sz.com");
 MODULE_LICENSE("GPL");
	/* CoreChip-sz SR9800 one chip USB 2.0 Ethernet Devices
	*
	* Author : Liu Junliang <liujunliang_ljl@163.com>
	*
	* Based on asix_common.c, asix_devices.c
	*
	* This file is licensed under the terms of the GNU General Public License
	* version 2. This program is licensed "as is" without any warranty of any
	* kind, whether express or implied.*
	*/

	#include <linux/module.h>
	#include <linux/kmod.h>
	#include <linux/init.h>
	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/ethtool.h>
	#include <linux/workqueue.h>
	#include <linux/mii.h>
	#include <linux/usb.h>
	#include <linux/crc32.h>
	#include <linux/usb/usbnet.h>
	#include <linux/slab.h>
	#include <linux/if_vlan.h>

	#include "sr9800.h"

	static int sr_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
	u16 size, void *data)
	{
	int err;

	err = usbnet_read_cmd(dev, cmd, SR_REQ_RD_REG, value, index,
	data, size);
	if ((err != size) && (err >= 0))
	err = -EINVAL;

	return err;
	}

	static int sr_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
	u16 size, void *data)
	{
	int err;

	err = usbnet_write_cmd(dev, cmd, SR_REQ_WR_REG, value, index,
	data, size);
	if ((err != size) && (err >= 0))
	err = -EINVAL;

	return err;
	}

	static void
	sr_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
	u16 size, void *data)
	{
	usbnet_write_cmd_async(dev, cmd, SR_REQ_WR_REG, value, index, data,
	size);
	}

	static int sr_rx_fixup(struct usbnet dev, struct sk_buff skb)
	{
	int offset = 0;

	/* This check is no longer done by usbnet */
	if (skb->len < dev->net->hard_header_len)
	return 0;

	while (offset + sizeof(u32) < skb->len) {
	struct sk_buff *sr_skb;
	u16 size;
	u32 header = get_unaligned_le32(skb->data + offset);

	offset += sizeof(u32);
	/* get the packet length */
	size = (u16) (header & 0x7ff);
	if (size != ((~header >> 16) & 0x07ff)) {
	netdev_err(dev->net, "%s : Bad Header Length\n",
	__func__);
	return 0;
	}

	if ((size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) \|\|
	(size + offset > skb->len)) {
	netdev_err(dev->net, "%s : Bad RX Length %d\n",
	__func__, size);
	return 0;
	}
	sr_skb = netdev_alloc_skb_ip_align(dev->net, size);
	if (!sr_skb)
	return 0;

	skb_put(sr_skb, size);
	memcpy(sr_skb->data, skb->data + offset, size);
	usbnet_skb_return(dev, sr_skb);

	offset += (size + 1) & 0xfffe;
	}

	if (skb->len != offset) {
	netdev_err(dev->net, "%s : Bad SKB Length %d\n", __func__,
	skb->len);
	return 0;
	}

	return 1;
	}

	static struct sk_buff sr_tx_fixup(struct usbnet dev, struct sk_buff *skb,
	gfp_t flags)
	{
	int headroom = skb_headroom(skb);
	int tailroom = skb_tailroom(skb);
	u32 padbytes = 0xffff0000;
	u32 packet_len;
	int padlen;
	void *ptr;

	padlen = ((skb->len + 4) % (dev->maxpacket - 1)) ? 0 : 4;

	if ((!skb_cloned(skb)) && ((headroom + tailroom) >= (4 + padlen))) {
	if ((headroom < 4) \|\| (tailroom < padlen)) {
	skb->data = memmove(skb->head + 4, skb->data,
	skb->len);
	skb_set_tail_pointer(skb, skb->len);
	}
	} else {
	struct sk_buff *skb2;
	skb2 = skb_copy_expand(skb, 4, padlen, flags);
	dev_kfree_skb_any(skb);
	skb = skb2;
	if (!skb)
	return NULL;
	}

	ptr = skb_push(skb, 4);
	packet_len = (((skb->len - 4) ^ 0x0000ffff) << 16) + (skb->len - 4);
	put_unaligned_le32(packet_len, ptr);

	if (padlen) {
	put_unaligned_le32(padbytes, skb_tail_pointer(skb));
	skb_put(skb, sizeof(padbytes));
	}

	usbnet_set_skb_tx_stats(skb, 1, 0);
	return skb;
	}

	static void sr_status(struct usbnet dev, struct urb urb)
	{
	struct sr9800_int_data *event;
	int link;

	if (urb->actual_length < 8)
	return;

	event = urb->transfer_buffer;
	link = event->link & 0x01;
	if (netif_carrier_ok(dev->net) != link) {
	usbnet_link_change(dev, link, 1);
	netdev_dbg(dev->net, "Link Status is: %d\n", link);
	}

	return;
	}

	static inline int sr_set_sw_mii(struct usbnet *dev)
	{
	int ret;

	ret = sr_write_cmd(dev, SR_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
	if (ret < 0)
	netdev_err(dev->net, "Failed to enable software MII access\n");
	return ret;
	}

	static inline int sr_set_hw_mii(struct usbnet *dev)
	{
	int ret;

	ret = sr_write_cmd(dev, SR_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
	if (ret < 0)
	netdev_err(dev->net, "Failed to enable hardware MII access\n");
	return ret;
	}

	static inline int sr_get_phy_addr(struct usbnet *dev)
	{
	u8 buf[2];
	int ret;

	ret = sr_read_cmd(dev, SR_CMD_READ_PHY_ID, 0, 0, 2, buf);
	if (ret < 0) {
	netdev_err(dev->net, "%s : Error reading PHYID register:%02x\n",
	__func__, ret);
	goto out;
	}
	netdev_dbg(dev->net, "%s : returning 0x%04x\n", __func__,
	((__le16 )buf));

	ret = buf[1];

	out:
	return ret;
	}

	static int sr_sw_reset(struct usbnet *dev, u8 flags)
	{
	int ret;

	ret = sr_write_cmd(dev, SR_CMD_SW_RESET, flags, 0, 0, NULL);
	if (ret < 0)
	netdev_err(dev->net, "Failed to send software reset:%02x\n",
	ret);

	return ret;
	}

	static u16 sr_read_rx_ctl(struct usbnet *dev)
	{
	__le16 v;
	int ret;

	ret = sr_read_cmd(dev, SR_CMD_READ_RX_CTL, 0, 0, 2, &v);
	if (ret < 0) {
	netdev_err(dev->net, "Error reading RX_CTL register:%02x\n",
	ret);
	goto out;
	}

	ret = le16_to_cpu(v);
	out:
	return ret;
	}

	static int sr_write_rx_ctl(struct usbnet *dev, u16 mode)
	{
	int ret;

	netdev_dbg(dev->net, "%s : mode = 0x%04x\n", __func__, mode);
	ret = sr_write_cmd(dev, SR_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
	if (ret < 0)
	netdev_err(dev->net,
	"Failed to write RX_CTL mode to 0x%04x:%02x\n",
	mode, ret);

	return ret;
	}

	static u16 sr_read_medium_status(struct usbnet *dev)
	{
	__le16 v;
	int ret;

	ret = sr_read_cmd(dev, SR_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);
	if (ret < 0) {
	netdev_err(dev->net,
	"Error reading Medium Status register:%02x\n", ret);
	return ret; /* TODO: callers not checking for error ret */
	}

	return le16_to_cpu(v);
	}

	static int sr_write_medium_mode(struct usbnet *dev, u16 mode)
	{
	int ret;

	netdev_dbg(dev->net, "%s : mode = 0x%04x\n", __func__, mode);
	ret = sr_write_cmd(dev, SR_CMD_WRITE_MEDIUM_MODE, mode, 0, 0, NULL);
	if (ret < 0)
	netdev_err(dev->net,
	"Failed to write Medium Mode mode to 0x%04x:%02x\n",
	mode, ret);
	return ret;
	}

	static int sr_write_gpio(struct usbnet *dev, u16 value, int sleep)
	{
	int ret;

	netdev_dbg(dev->net, "%s : value = 0x%04x\n", __func__, value);
	ret = sr_write_cmd(dev, SR_CMD_WRITE_GPIOS, value, 0, 0, NULL);
	if (ret < 0)
	netdev_err(dev->net, "Failed to write GPIO value 0x%04x:%02x\n",
	value, ret);
	if (sleep)
	msleep(sleep);

	return ret;
	}

	/* SR9800 have a 16-bit RX_CTL value */
	static void sr_set_multicast(struct net_device *net)
	{
	struct usbnet *dev = netdev_priv(net);
	struct sr_data data = (struct sr_data )&dev->data;
	u16 rx_ctl = SR_DEFAULT_RX_CTL;

	if (net->flags & IFF_PROMISC) {
	rx_ctl \|= SR_RX_CTL_PRO;
	} else if (net->flags & IFF_ALLMULTI \|\|
	netdev_mc_count(net) > SR_MAX_MCAST) {
	rx_ctl \|= SR_RX_CTL_AMALL;
	} else if (netdev_mc_empty(net)) {
	/* just broadcast and directed */
	} else {
	/* We use the 20 byte dev->data
	* for our 8 byte filter buffer
	* to avoid allocating memory that
	* is tricky to free later
	*/
	struct netdev_hw_addr *ha;
	u32 crc_bits;

	memset(data->multi_filter, 0, SR_MCAST_FILTER_SIZE);

	/* Build the multicast hash filter. */
	netdev_for_each_mc_addr(ha, net) {
	crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
	data->multi_filter[crc_bits >> 3] \|=
	1 << (crc_bits & 7);
	}

	sr_write_cmd_async(dev, SR_CMD_WRITE_MULTI_FILTER, 0, 0,
	SR_MCAST_FILTER_SIZE, data->multi_filter);

	rx_ctl \|= SR_RX_CTL_AM;
	}

	sr_write_cmd_async(dev, SR_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
	}

	static int sr_mdio_read(struct net_device *net, int phy_id, int loc)
	{
	struct usbnet *dev = netdev_priv(net);
	__le16 res = 0;

	mutex_lock(&dev->phy_mutex);
	sr_set_sw_mii(dev);
	sr_read_cmd(dev, SR_CMD_READ_MII_REG, phy_id, (__u16)loc, 2, &res);
	sr_set_hw_mii(dev);
	mutex_unlock(&dev->phy_mutex);

	netdev_dbg(dev->net,
	"%s : phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n", __func__,
	phy_id, loc, le16_to_cpu(res));

	return le16_to_cpu(res);
	}

	static void
	sr_mdio_write(struct net_device *net, int phy_id, int loc, int val)
	{
	struct usbnet *dev = netdev_priv(net);
	__le16 res = cpu_to_le16(val);

	netdev_dbg(dev->net,
	"%s : phy_id=0x%02x, loc=0x%02x, val=0x%04x\n", __func__,
	phy_id, loc, val);
	mutex_lock(&dev->phy_mutex);
	sr_set_sw_mii(dev);
	sr_write_cmd(dev, SR_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
	sr_set_hw_mii(dev);
	mutex_unlock(&dev->phy_mutex);
	}

	/* Get the PHY Identifier from the PHYSID1 & PHYSID2 MII registers */
	static u32 sr_get_phyid(struct usbnet *dev)
	{
	int phy_reg;
	u32 phy_id;
	int i;

	/* Poll for the rare case the FW or phy isn't ready yet. */
	for (i = 0; i < 100; i++) {
	phy_reg = sr_mdio_read(dev->net, dev->mii.phy_id, MII_PHYSID1);
	if (phy_reg != 0 && phy_reg != 0xFFFF)
	break;
	mdelay(1);
	}

	if (phy_reg <= 0 \|\| phy_reg == 0xFFFF)
	return 0;

	phy_id = (phy_reg & 0xffff) << 16;

	phy_reg = sr_mdio_read(dev->net, dev->mii.phy_id, MII_PHYSID2);
	if (phy_reg < 0)
	return 0;

	phy_id \|= (phy_reg & 0xffff);

	return phy_id;
	}

	static void
	sr_get_wol(struct net_device net, struct ethtool_wolinfo wolinfo)
	{
	struct usbnet *dev = netdev_priv(net);
	u8 opt;

	if (sr_read_cmd(dev, SR_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
	wolinfo->supported = 0;
	wolinfo->wolopts = 0;
	return;
	}
	wolinfo->supported = WAKE_PHY \| WAKE_MAGIC;
	wolinfo->wolopts = 0;
	if (opt & SR_MONITOR_LINK)
	wolinfo->wolopts \|= WAKE_PHY;
	if (opt & SR_MONITOR_MAGIC)
	wolinfo->wolopts \|= WAKE_MAGIC;
	}

	static int
	sr_set_wol(struct net_device net, struct ethtool_wolinfo wolinfo)
	{
	struct usbnet *dev = netdev_priv(net);
	u8 opt = 0;

	if (wolinfo->wolopts & ~(WAKE_PHY \| WAKE_MAGIC))
	return -EINVAL;

	if (wolinfo->wolopts & WAKE_PHY)
	opt \|= SR_MONITOR_LINK;
	if (wolinfo->wolopts & WAKE_MAGIC)
	opt \|= SR_MONITOR_MAGIC;

	if (sr_write_cmd(dev, SR_CMD_WRITE_MONITOR_MODE,
	opt, 0, 0, NULL) < 0)
	return -EINVAL;

	return 0;
	}

	static int sr_get_eeprom_len(struct net_device *net)
	{
	struct usbnet *dev = netdev_priv(net);
	struct sr_data data = (struct sr_data )&dev->data;

	return data->eeprom_len;
	}

	static int sr_get_eeprom(struct net_device *net,
	struct ethtool_eeprom eeprom, u8 data)
	{
	struct usbnet *dev = netdev_priv(net);
	__le16 ebuf = (__le16 )data;
	int ret;
	int i;

	/* Crude hack to ensure that we don't overwrite memory
	* if an odd length is supplied
	*/
	if (eeprom->len % 2)
	return -EINVAL;

	eeprom->magic = SR_EEPROM_MAGIC;

	/* sr9800 returns 2 bytes from eeprom on read */
	for (i = 0; i < eeprom->len / 2; i++) {
	ret = sr_read_cmd(dev, SR_CMD_READ_EEPROM, eeprom->offset + i,
	0, 2, &ebuf[i]);
	if (ret < 0)
	return -EINVAL;
	}
	return 0;
	}

	static void sr_get_drvinfo(struct net_device *net,
	struct ethtool_drvinfo *info)
	{
	/* Inherit standard device info */
	usbnet_get_drvinfo(net, info);
	strncpy(info->driver, DRIVER_NAME, sizeof(info->driver));
	strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
	}

	static u32 sr_get_link(struct net_device *net)
	{
	struct usbnet *dev = netdev_priv(net);

	return mii_link_ok(&dev->mii);
	}

	static int sr_ioctl(struct net_device net, struct ifreq rq, int cmd)
	{
	struct usbnet *dev = netdev_priv(net);

	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
	}

	static int sr_set_mac_address(struct net_device net, void p)
	{
	struct usbnet *dev = netdev_priv(net);
	struct sr_data data = (struct sr_data )&dev->data;
	struct sockaddr *addr = p;

	if (netif_running(net))
	return -EBUSY;
	if (!is_valid_ether_addr(addr->sa_data))
	return -EADDRNOTAVAIL;

	memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);

	/* We use the 20 byte dev->data
	* for our 6 byte mac buffer
	* to avoid allocating memory that
	* is tricky to free later
	*/
	memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
	sr_write_cmd_async(dev, SR_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
	data->mac_addr);

	return 0;
	}

	static const struct ethtool_ops sr9800_ethtool_ops = {
	.get_drvinfo = sr_get_drvinfo,
	.get_link = sr_get_link,
	.get_msglevel = usbnet_get_msglevel,
	.set_msglevel = usbnet_set_msglevel,
	.get_wol = sr_get_wol,
	.set_wol = sr_set_wol,
	.get_eeprom_len = sr_get_eeprom_len,
	.get_eeprom = sr_get_eeprom,
	.nway_reset = usbnet_nway_reset,
	.get_link_ksettings = usbnet_get_link_ksettings,
	.set_link_ksettings = usbnet_set_link_ksettings,
	};

	static int sr9800_link_reset(struct usbnet *dev)
	{
	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
	u16 mode;

	mii_check_media(&dev->mii, 1, 1);
	mii_ethtool_gset(&dev->mii, &ecmd);
	mode = SR9800_MEDIUM_DEFAULT;

	if (ethtool_cmd_speed(&ecmd) != SPEED_100)
	mode &= ~SR_MEDIUM_PS;

	if (ecmd.duplex != DUPLEX_FULL)
	mode &= ~SR_MEDIUM_FD;

	netdev_dbg(dev->net, "%s : speed: %u duplex: %d mode: 0x%04x\n",
	__func__, ethtool_cmd_speed(&ecmd), ecmd.duplex, mode);

	sr_write_medium_mode(dev, mode);

	return 0;
	}


	static int sr9800_set_default_mode(struct usbnet *dev)
	{
	u16 rx_ctl;
	int ret;

	sr_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
	sr_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
	ADVERTISE_ALL \| ADVERTISE_CSMA);
	mii_nway_restart(&dev->mii);

	ret = sr_write_medium_mode(dev, SR9800_MEDIUM_DEFAULT);
	if (ret < 0)
	goto out;

	ret = sr_write_cmd(dev, SR_CMD_WRITE_IPG012,
	SR9800_IPG0_DEFAULT \| SR9800_IPG1_DEFAULT,
	SR9800_IPG2_DEFAULT, 0, NULL);
	if (ret < 0) {
	netdev_dbg(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret);
	goto out;
	}

	/* Set RX_CTL to default values with 2k buffer, and enable cactus */
	ret = sr_write_rx_ctl(dev, SR_DEFAULT_RX_CTL);
	if (ret < 0)
	goto out;

	rx_ctl = sr_read_rx_ctl(dev);
	netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n",
	rx_ctl);

	rx_ctl = sr_read_medium_status(dev);
	netdev_dbg(dev->net, "Medium Status:0x%04x after all initializations\n",
	rx_ctl);

	return 0;
	out:
	return ret;
	}

	static int sr9800_reset(struct usbnet *dev)
	{
	struct sr_data data = (struct sr_data )&dev->data;
	int ret, embd_phy;
	u16 rx_ctl;

	ret = sr_write_gpio(dev,
	SR_GPIO_RSE \| SR_GPIO_GPO_2 \| SR_GPIO_GPO2EN, 5);
	if (ret < 0)
	goto out;

	embd_phy = ((sr_get_phy_addr(dev) & 0x1f) == 0x10 ? 1 : 0);

	ret = sr_write_cmd(dev, SR_CMD_SW_PHY_SELECT, embd_phy, 0, 0, NULL);
	if (ret < 0) {
	netdev_dbg(dev->net, "Select PHY #1 failed: %d\n", ret);
	goto out;
	}

	ret = sr_sw_reset(dev, SR_SWRESET_IPPD \| SR_SWRESET_PRL);
	if (ret < 0)
	goto out;

	msleep(150);

	ret = sr_sw_reset(dev, SR_SWRESET_CLEAR);
	if (ret < 0)
	goto out;

	msleep(150);

	if (embd_phy) {
	ret = sr_sw_reset(dev, SR_SWRESET_IPRL);
	if (ret < 0)
	goto out;
	} else {
	ret = sr_sw_reset(dev, SR_SWRESET_PRTE);
	if (ret < 0)
	goto out;
	}

	msleep(150);
	rx_ctl = sr_read_rx_ctl(dev);
	netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
	ret = sr_write_rx_ctl(dev, 0x0000);
	if (ret < 0)
	goto out;

	rx_ctl = sr_read_rx_ctl(dev);
	netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);

	ret = sr_sw_reset(dev, SR_SWRESET_PRL);
	if (ret < 0)
	goto out;

	msleep(150);

	ret = sr_sw_reset(dev, SR_SWRESET_IPRL \| SR_SWRESET_PRL);
	if (ret < 0)
	goto out;

	msleep(150);

	ret = sr9800_set_default_mode(dev);
	if (ret < 0)
	goto out;

	/* Rewrite MAC address */
	memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN);
	ret = sr_write_cmd(dev, SR_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
	data->mac_addr);
	if (ret < 0)
	goto out;

	return 0;

	out:
	return ret;
	}

	static const struct net_device_ops sr9800_netdev_ops = {
	.ndo_open = usbnet_open,
	.ndo_stop = usbnet_stop,
	.ndo_start_xmit = usbnet_start_xmit,
	.ndo_tx_timeout = usbnet_tx_timeout,
	.ndo_change_mtu = usbnet_change_mtu,
	.ndo_get_stats64 = usbnet_get_stats64,
	.ndo_set_mac_address = sr_set_mac_address,
	.ndo_validate_addr = eth_validate_addr,
	.ndo_do_ioctl = sr_ioctl,
	.ndo_set_rx_mode = sr_set_multicast,
	};

	static int sr9800_phy_powerup(struct usbnet *dev)
	{
	int ret;

	/* set the embedded Ethernet PHY in power-down state */
	ret = sr_sw_reset(dev, SR_SWRESET_IPPD \| SR_SWRESET_IPRL);
	if (ret < 0) {
	netdev_err(dev->net, "Failed to power down PHY : %d\n", ret);
	return ret;
	}
	msleep(20);

	/* set the embedded Ethernet PHY in power-up state */
	ret = sr_sw_reset(dev, SR_SWRESET_IPRL);
	if (ret < 0) {
	netdev_err(dev->net, "Failed to reset PHY: %d\n", ret);
	return ret;
	}
	msleep(600);

	/* set the embedded Ethernet PHY in reset state */
	ret = sr_sw_reset(dev, SR_SWRESET_CLEAR);
	if (ret < 0) {
	netdev_err(dev->net, "Failed to power up PHY: %d\n", ret);
	return ret;
	}
	msleep(20);

	/* set the embedded Ethernet PHY in power-up state */
	ret = sr_sw_reset(dev, SR_SWRESET_IPRL);
	if (ret < 0) {
	netdev_err(dev->net, "Failed to reset PHY: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int sr9800_bind(struct usbnet dev, struct usb_interface intf)
	{
	struct sr_data data = (struct sr_data )&dev->data;
	u16 led01_mux, led23_mux;
	int ret, embd_phy;
	u32 phyid;
	u16 rx_ctl;

	data->eeprom_len = SR9800_EEPROM_LEN;

	ret = usbnet_get_endpoints(dev, intf);
	if (ret)
	goto out;

	/* LED Setting Rule :
	* AABB:CCDD
	* AA : MFA0(LED0)
	* BB : MFA1(LED1)
	* CC : MFA2(LED2), Reserved for SR9800
	* DD : MFA3(LED3), Reserved for SR9800
	*/
	led01_mux = (SR_LED_MUX_LINK_ACTIVE << 8) \| SR_LED_MUX_LINK;
	led23_mux = (SR_LED_MUX_LINK_ACTIVE << 8) \| SR_LED_MUX_TX_ACTIVE;
	ret = sr_write_cmd(dev, SR_CMD_LED_MUX, led01_mux, led23_mux, 0, NULL);
	if (ret < 0) {
	netdev_err(dev->net, "set LINK LED failed : %d\n", ret);
	goto out;
	}

	/* Get the MAC address */
	ret = sr_read_cmd(dev, SR_CMD_READ_NODE_ID, 0, 0, ETH_ALEN,
	dev->net->dev_addr);
	if (ret < 0) {
	netdev_dbg(dev->net, "Failed to read MAC address: %d\n", ret);
	return ret;
	}
	netdev_dbg(dev->net, "mac addr : %pM\n", dev->net->dev_addr);

	/* Initialize MII structure */
	dev->mii.dev = dev->net;
	dev->mii.mdio_read = sr_mdio_read;
	dev->mii.mdio_write = sr_mdio_write;
	dev->mii.phy_id_mask = 0x1f;
	dev->mii.reg_num_mask = 0x1f;
	dev->mii.phy_id = sr_get_phy_addr(dev);

	dev->net->netdev_ops = &sr9800_netdev_ops;
	dev->net->ethtool_ops = &sr9800_ethtool_ops;

	embd_phy = ((dev->mii.phy_id & 0x1f) == 0x10 ? 1 : 0);
	/* Reset the PHY to normal operation mode */
	ret = sr_write_cmd(dev, SR_CMD_SW_PHY_SELECT, embd_phy, 0, 0, NULL);
	if (ret < 0) {
	netdev_dbg(dev->net, "Select PHY #1 failed: %d\n", ret);
	return ret;
	}

	/* Init PHY routine */
	ret = sr9800_phy_powerup(dev);
	if (ret < 0)
	goto out;

	rx_ctl = sr_read_rx_ctl(dev);
	netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
	ret = sr_write_rx_ctl(dev, 0x0000);
	if (ret < 0)
	goto out;

	rx_ctl = sr_read_rx_ctl(dev);
	netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);

	/* Read PHYID register AFTER the PHY was reset properly */
	phyid = sr_get_phyid(dev);
	netdev_dbg(dev->net, "PHYID=0x%08x\n", phyid);

	/* medium mode setting */
	ret = sr9800_set_default_mode(dev);
	if (ret < 0)
	goto out;

	if (dev->udev->speed == USB_SPEED_HIGH) {
	ret = sr_write_cmd(dev, SR_CMD_BULKIN_SIZE,
	SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_4K].byte_cnt,
	SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_4K].threshold,
	0, NULL);
	if (ret < 0) {
	netdev_err(dev->net, "Reset RX_CTL failed: %d\n", ret);
	goto out;
	}
	dev->rx_urb_size =
	SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_4K].size;
	} else {
	ret = sr_write_cmd(dev, SR_CMD_BULKIN_SIZE,
	SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_2K].byte_cnt,
	SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_2K].threshold,
	0, NULL);
	if (ret < 0) {
	netdev_err(dev->net, "Reset RX_CTL failed: %d\n", ret);
	goto out;
	}
	dev->rx_urb_size =
	SR9800_BULKIN_SIZE[SR9800_MAX_BULKIN_2K].size;
	}
	netdev_dbg(dev->net, "%s : setting rx_urb_size with : %zu\n", __func__,
	dev->rx_urb_size);
	return 0;

	out:
	return ret;
	}

	static const struct driver_info sr9800_driver_info = {
	.description = "CoreChip SR9800 USB 2.0 Ethernet",
	.bind = sr9800_bind,
	.status = sr_status,
	.link_reset = sr9800_link_reset,
	.reset = sr9800_reset,
	.flags = DRIVER_FLAG,
	.rx_fixup = sr_rx_fixup,
	.tx_fixup = sr_tx_fixup,
	};

	static const struct usb_device_id products[] = {
	{
	USB_DEVICE(0x0fe6, 0x9800), /* SR9800 Device */
	.driver_info = (unsigned long) &sr9800_driver_info,
	},
	{}, /* END */
	};

	MODULE_DEVICE_TABLE(usb, products);

	static struct usb_driver sr_driver = {
	.name = DRIVER_NAME,
	.id_table = products,
	.probe = usbnet_probe,
	.suspend = usbnet_suspend,
	.resume = usbnet_resume,
	.disconnect = usbnet_disconnect,
	.supports_autosuspend = 1,
	};

	module_usb_driver(sr_driver);

	MODULE_AUTHOR("Liu Junliang <liujunliang_ljl@163.com");
	MODULE_VERSION(DRIVER_VERSION);
	MODULE_DESCRIPTION("SR9800 USB 2.0 USB2NET Dev : http://www.corechip-sz.com");
	MODULE_LICENSE("GPL");