/***************************************************************************
   *
   * Copyright (C) 2007-2010 SMSC
   *
   * 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, see <http://www.gnu.org/licenses/>.

   *
   *****************************************************************************/
  
  #include <linux/module.h>
  #include <linux/kmod.h>

  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/ethtool.h>
  #include <linux/mii.h>
  #include <linux/usb.h>

  #include <linux/bitrev.h>
  #include <linux/crc16.h>

  #include <linux/crc32.h>
  #include <linux/usb/usbnet.h>

  #include <linux/slab.h>

  #include <linux/of_net.h>

  #include "smsc75xx.h"
  
  #define SMSC_CHIPNAME			"smsc75xx"
  #define SMSC_DRIVER_VERSION		"1.0.0"
  #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		(9000)
  #define LAN75XX_EEPROM_MAGIC		(0x7500)
  #define EEPROM_MAC_OFFSET		(0x01)
  #define DEFAULT_TX_CSUM_ENABLE		(true)
  #define DEFAULT_RX_CSUM_ENABLE		(true)

  #define SMSC75XX_INTERNAL_PHY_ID	(1)
  #define SMSC75XX_TX_OVERHEAD		(8)
  #define MAX_RX_FIFO_SIZE		(20 * 1024)
  #define MAX_TX_FIFO_SIZE		(12 * 1024)
  #define USB_VENDOR_ID_SMSC		(0x0424)
  #define USB_PRODUCT_ID_LAN7500		(0x7500)
  #define USB_PRODUCT_ID_LAN7505		(0x7505)

  #define RXW_PADDING			2

  #define SUPPORTED_WAKE			(WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \

  					 WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)

  #define SUSPEND_SUSPEND0		(0x01)
  #define SUSPEND_SUSPEND1		(0x02)
  #define SUSPEND_SUSPEND2		(0x04)
  #define SUSPEND_SUSPEND3		(0x08)

  #define SUSPEND_ALLMODES		(SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
  					 SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)

  struct smsc75xx_priv {
  	struct usbnet *dev;
  	u32 rfe_ctl;

  	u32 wolopts;

  	u32 multicast_hash_table[DP_SEL_VHF_HASH_LEN];

  	struct mutex dataport_mutex;
  	spinlock_t rfe_ctl_lock;
  	struct work_struct set_multicast;

  	u8 suspend_flags;

  };
  
  struct usb_context {
  	struct usb_ctrlrequest req;
  	struct usbnet *dev;
  };

  static bool turbo_mode = true;

  module_param(turbo_mode, bool, 0644);
  MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");

  static int __must_check __smsc75xx_read_reg(struct usbnet *dev, u32 index,
  					    u32 *data, int in_pm)

  {

  	u32 buf;

  	int ret;

  	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);

  
  	BUG_ON(!dev);

  	if (!in_pm)
  		fn = usbnet_read_cmd;
  	else
  		fn = usbnet_read_cmd_nopm;
  
  	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
  		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  		 0, index, &buf, 4);

  	if (unlikely(ret < 0)) {

  		netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d
  ",
  			    index, ret);

  		return ret;
  	}

  	le32_to_cpus(&buf);
  	*data = buf;

  
  	return ret;
  }

  static int __must_check __smsc75xx_write_reg(struct usbnet *dev, u32 index,
  					     u32 data, int in_pm)

  {

  	u32 buf;

  	int ret;

  	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);

  
  	BUG_ON(!dev);

  	if (!in_pm)
  		fn = usbnet_write_cmd;
  	else
  		fn = usbnet_write_cmd_nopm;

  	buf = data;
  	cpu_to_le32s(&buf);

  	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
  		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  		 0, index, &buf, 4);

  	if (unlikely(ret < 0))

  		netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d
  ",
  			    index, ret);

  	return ret;
  }

  static int __must_check smsc75xx_read_reg_nopm(struct usbnet *dev, u32 index,
  					       u32 *data)
  {
  	return __smsc75xx_read_reg(dev, index, data, 1);
  }
  
  static int __must_check smsc75xx_write_reg_nopm(struct usbnet *dev, u32 index,
  						u32 data)
  {
  	return __smsc75xx_write_reg(dev, index, data, 1);
  }
  
  static int __must_check smsc75xx_read_reg(struct usbnet *dev, u32 index,
  					  u32 *data)
  {
  	return __smsc75xx_read_reg(dev, index, data, 0);
  }
  
  static int __must_check smsc75xx_write_reg(struct usbnet *dev, u32 index,
  					   u32 data)
  {
  	return __smsc75xx_write_reg(dev, index, data, 0);
  }

  /* Loop until the read is completed with timeout
   * called with phy_mutex held */

  static __must_check int __smsc75xx_phy_wait_not_busy(struct usbnet *dev,
  						     int in_pm)

  {
  	unsigned long start_time = jiffies;
  	u32 val;
  	int ret;
  
  	do {

  		ret = __smsc75xx_read_reg(dev, MII_ACCESS, &val, in_pm);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading MII_ACCESS
  ");
  			return ret;
  		}

  
  		if (!(val & MII_ACCESS_BUSY))
  			return 0;
  	} while (!time_after(jiffies, start_time + HZ));
  
  	return -EIO;
  }

  static int __smsc75xx_mdio_read(struct net_device *netdev, int phy_id, int idx,
  				int in_pm)

  {
  	struct usbnet *dev = netdev_priv(netdev);
  	u32 val, addr;
  	int ret;
  
  	mutex_lock(&dev->phy_mutex);
  
  	/* confirm MII not busy */

  	ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "MII is busy in smsc75xx_mdio_read
  ");
  		goto done;
  	}

  
  	/* set the address, index & direction (read from PHY) */
  	phy_id &= dev->mii.phy_id_mask;
  	idx &= dev->mii.reg_num_mask;
  	addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
  		| ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)

  		| MII_ACCESS_READ | MII_ACCESS_BUSY;

  	ret = __smsc75xx_write_reg(dev, MII_ACCESS, addr, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing MII_ACCESS
  ");
  		goto done;
  	}

  	ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Timed out reading MII reg %02X
  ", idx);
  		goto done;
  	}

  	ret = __smsc75xx_read_reg(dev, MII_DATA, &val, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading MII_DATA
  ");
  		goto done;
  	}

  
  	ret = (u16)(val & 0xFFFF);
  
  done:
  	mutex_unlock(&dev->phy_mutex);
  	return ret;
  }

  static void __smsc75xx_mdio_write(struct net_device *netdev, int phy_id,
  				  int idx, int regval, int in_pm)

  {
  	struct usbnet *dev = netdev_priv(netdev);
  	u32 val, addr;
  	int ret;
  
  	mutex_lock(&dev->phy_mutex);
  
  	/* confirm MII not busy */

  	ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "MII is busy in smsc75xx_mdio_write
  ");
  		goto done;
  	}

  
  	val = regval;

  	ret = __smsc75xx_write_reg(dev, MII_DATA, val, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing MII_DATA
  ");
  		goto done;
  	}

  
  	/* set the address, index & direction (write to PHY) */
  	phy_id &= dev->mii.phy_id_mask;
  	idx &= dev->mii.reg_num_mask;
  	addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
  		| ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)

  		| MII_ACCESS_WRITE | MII_ACCESS_BUSY;

  	ret = __smsc75xx_write_reg(dev, MII_ACCESS, addr, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing MII_ACCESS
  ");
  		goto done;
  	}

  	ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Timed out writing MII reg %02X
  ", idx);
  		goto done;
  	}

  
  done:
  	mutex_unlock(&dev->phy_mutex);
  }

  static int smsc75xx_mdio_read_nopm(struct net_device *netdev, int phy_id,
  				   int idx)
  {
  	return __smsc75xx_mdio_read(netdev, phy_id, idx, 1);
  }
  
  static void smsc75xx_mdio_write_nopm(struct net_device *netdev, int phy_id,
  				     int idx, int regval)
  {
  	__smsc75xx_mdio_write(netdev, phy_id, idx, regval, 1);
  }
  
  static int smsc75xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
  {
  	return __smsc75xx_mdio_read(netdev, phy_id, idx, 0);
  }
  
  static void smsc75xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
  				int regval)
  {
  	__smsc75xx_mdio_write(netdev, phy_id, idx, regval, 0);
  }

  static int smsc75xx_wait_eeprom(struct usbnet *dev)
  {
  	unsigned long start_time = jiffies;
  	u32 val;
  	int ret;
  
  	do {
  		ret = smsc75xx_read_reg(dev, E2P_CMD, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading E2P_CMD
  ");
  			return ret;
  		}

  
  		if (!(val & E2P_CMD_BUSY) || (val & E2P_CMD_TIMEOUT))
  			break;
  		udelay(40);
  	} while (!time_after(jiffies, start_time + HZ));
  
  	if (val & (E2P_CMD_TIMEOUT | E2P_CMD_BUSY)) {

  		netdev_warn(dev->net, "EEPROM read operation timeout
  ");

  		return -EIO;
  	}
  
  	return 0;
  }
  
  static int smsc75xx_eeprom_confirm_not_busy(struct usbnet *dev)
  {
  	unsigned long start_time = jiffies;
  	u32 val;
  	int ret;
  
  	do {
  		ret = smsc75xx_read_reg(dev, E2P_CMD, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading E2P_CMD
  ");
  			return ret;
  		}

  
  		if (!(val & E2P_CMD_BUSY))
  			return 0;
  
  		udelay(40);
  	} while (!time_after(jiffies, start_time + HZ));

  	netdev_warn(dev->net, "EEPROM is busy
  ");

  	return -EIO;
  }
  
  static int smsc75xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
  				u8 *data)
  {
  	u32 val;
  	int i, ret;
  
  	BUG_ON(!dev);
  	BUG_ON(!data);
  
  	ret = smsc75xx_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);
  		ret = smsc75xx_write_reg(dev, E2P_CMD, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing E2P_CMD
  ");
  			return ret;
  		}

  
  		ret = smsc75xx_wait_eeprom(dev);
  		if (ret < 0)
  			return ret;
  
  		ret = smsc75xx_read_reg(dev, E2P_DATA, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading E2P_DATA
  ");
  			return ret;
  		}

  
  		data[i] = val & 0xFF;
  		offset++;
  	}
  
  	return 0;
  }
  
  static int smsc75xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
  				 u8 *data)
  {
  	u32 val;
  	int i, ret;
  
  	BUG_ON(!dev);
  	BUG_ON(!data);
  
  	ret = smsc75xx_eeprom_confirm_not_busy(dev);
  	if (ret)
  		return ret;
  
  	/* Issue write/erase enable command */
  	val = E2P_CMD_BUSY | E2P_CMD_EWEN;
  	ret = smsc75xx_write_reg(dev, E2P_CMD, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing E2P_CMD
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_wait_eeprom(dev);
  	if (ret < 0)
  		return ret;
  
  	for (i = 0; i < length; i++) {
  
  		/* Fill data register */
  		val = data[i];
  		ret = smsc75xx_write_reg(dev, E2P_DATA, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing E2P_DATA
  ");
  			return ret;
  		}

  
  		/* Send "write" command */
  		val = E2P_CMD_BUSY | E2P_CMD_WRITE | (offset & E2P_CMD_ADDR);
  		ret = smsc75xx_write_reg(dev, E2P_CMD, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing E2P_CMD
  ");
  			return ret;
  		}

  
  		ret = smsc75xx_wait_eeprom(dev);
  		if (ret < 0)
  			return ret;
  
  		offset++;
  	}
  
  	return 0;
  }
  
  static int smsc75xx_dataport_wait_not_busy(struct usbnet *dev)
  {
  	int i, ret;
  
  	for (i = 0; i < 100; i++) {
  		u32 dp_sel;
  		ret = smsc75xx_read_reg(dev, DP_SEL, &dp_sel);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading DP_SEL
  ");
  			return ret;
  		}

  
  		if (dp_sel & DP_SEL_DPRDY)
  			return 0;
  
  		udelay(40);
  	}

  	netdev_warn(dev->net, "smsc75xx_dataport_wait_not_busy timed out
  ");

  
  	return -EIO;
  }
  
  static int smsc75xx_dataport_write(struct usbnet *dev, u32 ram_select, u32 addr,
  				   u32 length, u32 *buf)
  {
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
  	u32 dp_sel;
  	int i, ret;
  
  	mutex_lock(&pdata->dataport_mutex);
  
  	ret = smsc75xx_dataport_wait_not_busy(dev);

  	if (ret < 0) {
  		netdev_warn(dev->net, "smsc75xx_dataport_write busy on entry
  ");
  		goto done;
  	}

  
  	ret = smsc75xx_read_reg(dev, DP_SEL, &dp_sel);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading DP_SEL
  ");
  		goto done;
  	}

  
  	dp_sel &= ~DP_SEL_RSEL;
  	dp_sel |= ram_select;
  	ret = smsc75xx_write_reg(dev, DP_SEL, dp_sel);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing DP_SEL
  ");
  		goto done;
  	}

  
  	for (i = 0; i < length; i++) {
  		ret = smsc75xx_write_reg(dev, DP_ADDR, addr + i);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing DP_ADDR
  ");
  			goto done;
  		}

  
  		ret = smsc75xx_write_reg(dev, DP_DATA, buf[i]);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing DP_DATA
  ");
  			goto done;
  		}

  
  		ret = smsc75xx_write_reg(dev, DP_CMD, DP_CMD_WRITE);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing DP_CMD
  ");
  			goto done;
  		}

  
  		ret = smsc75xx_dataport_wait_not_busy(dev);

  		if (ret < 0) {
  			netdev_warn(dev->net, "smsc75xx_dataport_write timeout
  ");
  			goto done;
  		}

  	}
  
  done:
  	mutex_unlock(&pdata->dataport_mutex);
  	return ret;
  }
  
  /* returns hash bit number for given MAC address */
  static u32 smsc75xx_hash(char addr[ETH_ALEN])
  {
  	return (ether_crc(ETH_ALEN, addr) >> 23) & 0x1ff;
  }
  
  static void smsc75xx_deferred_multicast_write(struct work_struct *param)
  {
  	struct smsc75xx_priv *pdata =
  		container_of(param, struct smsc75xx_priv, set_multicast);
  	struct usbnet *dev = pdata->dev;
  	int ret;

  	netif_dbg(dev, drv, dev->net, "deferred multicast write 0x%08x
  ",
  		  pdata->rfe_ctl);

  
  	smsc75xx_dataport_write(dev, DP_SEL_VHF, DP_SEL_VHF_VLAN_LEN,
  		DP_SEL_VHF_HASH_LEN, pdata->multicast_hash_table);
  
  	ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);

  	if (ret < 0)
  		netdev_warn(dev->net, "Error writing RFE_CRL
  ");

  }
  
  static void smsc75xx_set_multicast(struct net_device *netdev)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
  	unsigned long flags;
  	int i;
  
  	spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);
  
  	pdata->rfe_ctl &=
  		~(RFE_CTL_AU | RFE_CTL_AM | RFE_CTL_DPF | RFE_CTL_MHF);
  	pdata->rfe_ctl |= RFE_CTL_AB;
  
  	for (i = 0; i < DP_SEL_VHF_HASH_LEN; i++)
  		pdata->multicast_hash_table[i] = 0;
  
  	if (dev->net->flags & IFF_PROMISC) {

  		netif_dbg(dev, drv, dev->net, "promiscuous mode enabled
  ");

  		pdata->rfe_ctl |= RFE_CTL_AM | RFE_CTL_AU;
  	} else if (dev->net->flags & IFF_ALLMULTI) {

  		netif_dbg(dev, drv, dev->net, "receive all multicast enabled
  ");

  		pdata->rfe_ctl |= RFE_CTL_AM | RFE_CTL_DPF;
  	} else if (!netdev_mc_empty(dev->net)) {

  		struct netdev_hw_addr *ha;

  		netif_dbg(dev, drv, dev->net, "receive multicast hash filter
  ");

  
  		pdata->rfe_ctl |= RFE_CTL_MHF | RFE_CTL_DPF;

  		netdev_for_each_mc_addr(ha, netdev) {
  			u32 bitnum = smsc75xx_hash(ha->addr);

  			pdata->multicast_hash_table[bitnum / 32] |=
  				(1 << (bitnum % 32));
  		}
  	} else {

  		netif_dbg(dev, drv, dev->net, "receive own packets only
  ");

  		pdata->rfe_ctl |= RFE_CTL_DPF;
  	}
  
  	spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);
  
  	/* defer register writes to a sleepable context */
  	schedule_work(&pdata->set_multicast);
  }
  
  static int smsc75xx_update_flowcontrol(struct usbnet *dev, u8 duplex,
  					    u16 lcladv, u16 rmtadv)
  {
  	u32 flow = 0, fct_flow = 0;
  	int ret;
  
  	if (duplex == DUPLEX_FULL) {
  		u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
  
  		if (cap & FLOW_CTRL_TX) {
  			flow = (FLOW_TX_FCEN | 0xFFFF);
  			/* set fct_flow thresholds to 20% and 80% */
  			fct_flow = (8 << 8) | 32;
  		}
  
  		if (cap & FLOW_CTRL_RX)
  			flow |= FLOW_RX_FCEN;

  		netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s
  ",
  			  (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
  			  (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));

  	} else {

  		netif_dbg(dev, link, dev->net, "half duplex
  ");

  	}
  
  	ret = smsc75xx_write_reg(dev, FLOW, flow);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing FLOW
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, FCT_FLOW, fct_flow);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing FCT_FLOW
  ");
  		return ret;
  	}

  
  	return 0;
  }
  
  static int smsc75xx_link_reset(struct usbnet *dev)
  {
  	struct mii_if_info *mii = &dev->mii;

  	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };

  	u16 lcladv, rmtadv;
  	int ret;

  	/* write to clear phy interrupt status */

  	smsc75xx_mdio_write(dev->net, mii->phy_id, PHY_INT_SRC,
  		PHY_INT_SRC_CLEAR_ALL);

  
  	ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing INT_STS
  ");
  		return ret;
  	}

  
  	mii_check_media(mii, 1, 1);
  	mii_ethtool_gset(&dev->mii, &ecmd);
  	lcladv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
  	rmtadv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_LPA);

  	netif_dbg(dev, link, dev->net, "speed: %u duplex: %d lcladv: %04x rmtadv: %04x
  ",
  		  ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);

  
  	return smsc75xx_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
  }
  
  static void smsc75xx_status(struct usbnet *dev, struct urb *urb)
  {
  	u32 intdata;
  
  	if (urb->actual_length != 4) {

  		netdev_warn(dev->net, "unexpected urb length %d
  ",
  			    urb->actual_length);

  		return;
  	}
  
  	memcpy(&intdata, urb->transfer_buffer, 4);
  	le32_to_cpus(&intdata);

  	netif_dbg(dev, link, dev->net, "intdata: 0x%08X
  ", intdata);

  
  	if (intdata & INT_ENP_PHY_INT)
  		usbnet_defer_kevent(dev, EVENT_LINK_RESET);
  	else

  		netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X
  ",
  			    intdata);

  }

  static int smsc75xx_ethtool_get_eeprom_len(struct net_device *net)
  {
  	return MAX_EEPROM_SIZE;
  }
  
  static int smsc75xx_ethtool_get_eeprom(struct net_device *netdev,
  				       struct ethtool_eeprom *ee, u8 *data)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  
  	ee->magic = LAN75XX_EEPROM_MAGIC;
  
  	return smsc75xx_read_eeprom(dev, ee->offset, ee->len, data);
  }
  
  static int smsc75xx_ethtool_set_eeprom(struct net_device *netdev,
  				       struct ethtool_eeprom *ee, u8 *data)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  
  	if (ee->magic != LAN75XX_EEPROM_MAGIC) {

  		netdev_warn(dev->net, "EEPROM: magic value mismatch: 0x%x
  ",
  			    ee->magic);

  		return -EINVAL;
  	}
  
  	return smsc75xx_write_eeprom(dev, ee->offset, ee->len, data);
  }

  static void smsc75xx_ethtool_get_wol(struct net_device *net,
  				     struct ethtool_wolinfo *wolinfo)
  {
  	struct usbnet *dev = netdev_priv(net);
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
  
  	wolinfo->supported = SUPPORTED_WAKE;
  	wolinfo->wolopts = pdata->wolopts;
  }
  
  static int smsc75xx_ethtool_set_wol(struct net_device *net,
  				    struct ethtool_wolinfo *wolinfo)
  {
  	struct usbnet *dev = netdev_priv(net);
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

  	int ret;

  
  	pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;

  
  	ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);

  	if (ret < 0)
  		netdev_warn(dev->net, "device_set_wakeup_enable error %d
  ", ret);

  	return ret;

  }

  static const struct ethtool_ops smsc75xx_ethtool_ops = {
  	.get_link	= usbnet_get_link,
  	.nway_reset	= usbnet_nway_reset,
  	.get_drvinfo	= usbnet_get_drvinfo,
  	.get_msglevel	= usbnet_get_msglevel,
  	.set_msglevel	= usbnet_set_msglevel,
  	.get_settings	= usbnet_get_settings,
  	.set_settings	= usbnet_set_settings,
  	.get_eeprom_len	= smsc75xx_ethtool_get_eeprom_len,
  	.get_eeprom	= smsc75xx_ethtool_get_eeprom,
  	.set_eeprom	= smsc75xx_ethtool_set_eeprom,

  	.get_wol	= smsc75xx_ethtool_get_wol,
  	.set_wol	= smsc75xx_ethtool_set_wol,

  };
  
  static int smsc75xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
  {
  	struct usbnet *dev = netdev_priv(netdev);
  
  	if (!netif_running(netdev))
  		return -EINVAL;
  
  	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
  }
  
  static void smsc75xx_init_mac_address(struct usbnet *dev)
  {

  	const u8 *mac_addr;
  
  	/* maybe the boot loader passed the MAC address in devicetree */
  	mac_addr = of_get_mac_address(dev->udev->dev.of_node);
  	if (mac_addr) {
  		memcpy(dev->net->dev_addr, mac_addr, ETH_ALEN);
  		return;
  	}

  	/* try reading mac address from EEPROM */
  	if (smsc75xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
  			dev->net->dev_addr) == 0) {
  		if (is_valid_ether_addr(dev->net->dev_addr)) {
  			/* eeprom values are valid so use them */
  			netif_dbg(dev, ifup, dev->net,

  				  "MAC address read from EEPROM
  ");

  			return;
  		}
  	}

  	/* no useful static MAC address found. generate a random one */

  	eth_hw_addr_random(dev->net);

  	netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr
  ");

  }
  
  static int smsc75xx_set_mac_address(struct usbnet *dev)
  {
  	u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
  		dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
  	u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
  
  	int ret = smsc75xx_write_reg(dev, RX_ADDRH, addr_hi);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write RX_ADDRH: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, RX_ADDRL, addr_lo);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write RX_ADDRL: %d
  ", ret);
  		return ret;
  	}

  
  	addr_hi |= ADDR_FILTX_FB_VALID;
  	ret = smsc75xx_write_reg(dev, ADDR_FILTX, addr_hi);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write ADDR_FILTX: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, ADDR_FILTX + 4, addr_lo);

  	if (ret < 0)
  		netdev_warn(dev->net, "Failed to write ADDR_FILTX+4: %d
  ", ret);

  	return ret;

  }
  
  static int smsc75xx_phy_initialize(struct usbnet *dev)
  {

  	int bmcr, ret, timeout = 0;

  
  	/* Initialize MII structure */
  	dev->mii.dev = dev->net;
  	dev->mii.mdio_read = smsc75xx_mdio_read;
  	dev->mii.mdio_write = smsc75xx_mdio_write;
  	dev->mii.phy_id_mask = 0x1f;
  	dev->mii.reg_num_mask = 0x1f;

  	dev->mii.supports_gmii = 1;

  	dev->mii.phy_id = SMSC75XX_INTERNAL_PHY_ID;
  
  	/* reset phy and wait for reset to complete */
  	smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
  
  	do {
  		msleep(10);
  		bmcr = smsc75xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);

  		if (bmcr < 0) {
  			netdev_warn(dev->net, "Error reading MII_BMCR
  ");
  			return bmcr;
  		}

  		timeout++;

  	} while ((bmcr & BMCR_RESET) && (timeout < 100));

  
  	if (timeout >= 100) {

  		netdev_warn(dev->net, "timeout on PHY Reset
  ");

  		return -EIO;
  	}
  
  	smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
  		ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
  		ADVERTISE_PAUSE_ASYM);

  	smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_CTRL1000,
  		ADVERTISE_1000FULL);

  	/* read and write to clear phy interrupt status */
  	ret = smsc75xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading PHY_INT_SRC
  ");
  		return ret;
  	}

  	smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_SRC, 0xffff);

  
  	smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
  		PHY_INT_MASK_DEFAULT);
  	mii_nway_restart(&dev->mii);

  	netif_dbg(dev, ifup, dev->net, "phy initialised successfully
  ");

  	return 0;
  }
  
  static int smsc75xx_set_rx_max_frame_length(struct usbnet *dev, int size)
  {
  	int ret = 0;
  	u32 buf;
  	bool rxenabled;
  
  	ret = smsc75xx_read_reg(dev, MAC_RX, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read MAC_RX: %d
  ", ret);
  		return ret;
  	}

  
  	rxenabled = ((buf & MAC_RX_RXEN) != 0);
  
  	if (rxenabled) {
  		buf &= ~MAC_RX_RXEN;
  		ret = smsc75xx_write_reg(dev, MAC_RX, buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to write MAC_RX: %d
  ", ret);
  			return ret;
  		}

  	}
  
  	/* add 4 to size for FCS */
  	buf &= ~MAC_RX_MAX_SIZE;
  	buf |= (((size + 4) << MAC_RX_MAX_SIZE_SHIFT) & MAC_RX_MAX_SIZE);
  
  	ret = smsc75xx_write_reg(dev, MAC_RX, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write MAC_RX: %d
  ", ret);
  		return ret;
  	}

  
  	if (rxenabled) {
  		buf |= MAC_RX_RXEN;
  		ret = smsc75xx_write_reg(dev, MAC_RX, buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to write MAC_RX: %d
  ", ret);
  			return ret;
  		}

  	}
  
  	return 0;
  }
  
  static int smsc75xx_change_mtu(struct net_device *netdev, int new_mtu)
  {
  	struct usbnet *dev = netdev_priv(netdev);

  	int ret;
  
  	if (new_mtu > MAX_SINGLE_PACKET_SIZE)
  		return -EINVAL;

  	ret = smsc75xx_set_rx_max_frame_length(dev, new_mtu + ETH_HLEN);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to set mac rx frame length
  ");
  		return ret;
  	}

  
  	return usbnet_change_mtu(netdev, new_mtu);
  }

  /* Enable or disable Rx checksum offload engine */

  static int smsc75xx_set_features(struct net_device *netdev,
  	netdev_features_t features)

  {
  	struct usbnet *dev = netdev_priv(netdev);
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
  	unsigned long flags;
  	int ret;
  
  	spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);
  
  	if (features & NETIF_F_RXCSUM)
  		pdata->rfe_ctl |= RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM;
  	else
  		pdata->rfe_ctl &= ~(RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM);
  
  	spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);
  	/* it's racing here! */
  
  	ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);

  	if (ret < 0)
  		netdev_warn(dev->net, "Error writing RFE_CTL
  ");

  	return ret;

  }

  static int smsc75xx_wait_ready(struct usbnet *dev, int in_pm)

  {
  	int timeout = 0;
  
  	do {
  		u32 buf;

  		int ret;
  
  		ret = __smsc75xx_read_reg(dev, PMT_CTL, &buf, in_pm);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to read PMT_CTL: %d
  ", ret);
  			return ret;
  		}

  
  		if (buf & PMT_CTL_DEV_RDY)
  			return 0;
  
  		msleep(10);
  		timeout++;
  	} while (timeout < 100);

  	netdev_warn(dev->net, "timeout waiting for device ready
  ");

  	return -EIO;
  }

  static int smsc75xx_reset(struct usbnet *dev)
  {
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
  	u32 buf;
  	int ret = 0, timeout;

  	netif_dbg(dev, ifup, dev->net, "entering smsc75xx_reset
  ");

  	ret = smsc75xx_wait_ready(dev, 0);

  	if (ret < 0) {
  		netdev_warn(dev->net, "device not ready in smsc75xx_reset
  ");
  		return ret;
  	}

  	ret = smsc75xx_read_reg(dev, HW_CFG, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read HW_CFG: %d
  ", ret);
  		return ret;
  	}

  
  	buf |= HW_CFG_LRST;
  
  	ret = smsc75xx_write_reg(dev, HW_CFG, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write HW_CFG: %d
  ", ret);
  		return ret;
  	}

  
  	timeout = 0;
  	do {
  		msleep(10);
  		ret = smsc75xx_read_reg(dev, HW_CFG, &buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to read HW_CFG: %d
  ", ret);
  			return ret;
  		}

  		timeout++;
  	} while ((buf & HW_CFG_LRST) && (timeout < 100));
  
  	if (timeout >= 100) {

  		netdev_warn(dev->net, "timeout on completion of Lite Reset
  ");

  		return -EIO;
  	}

  	netif_dbg(dev, ifup, dev->net, "Lite reset complete, resetting PHY
  ");

  
  	ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read PMT_CTL: %d
  ", ret);
  		return ret;
  	}

  
  	buf |= PMT_CTL_PHY_RST;
  
  	ret = smsc75xx_write_reg(dev, PMT_CTL, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write PMT_CTL: %d
  ", ret);
  		return ret;
  	}

  
  	timeout = 0;
  	do {
  		msleep(10);
  		ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to read PMT_CTL: %d
  ", ret);
  			return ret;
  		}

  		timeout++;
  	} while ((buf & PMT_CTL_PHY_RST) && (timeout < 100));
  
  	if (timeout >= 100) {

  		netdev_warn(dev->net, "timeout waiting for PHY Reset
  ");

  		return -EIO;
  	}

  	netif_dbg(dev, ifup, dev->net, "PHY reset complete
  ");

  	ret = smsc75xx_set_mac_address(dev);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to set mac address
  ");
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "MAC Address: %pM
  ",
  		  dev->net->dev_addr);

  
  	ret = smsc75xx_read_reg(dev, HW_CFG, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read HW_CFG: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x
  ",
  		  buf);

  
  	buf |= HW_CFG_BIR;
  
  	ret = smsc75xx_write_reg(dev, HW_CFG, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net,  "Failed to write HW_CFG: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_read_reg(dev, HW_CFG, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read HW_CFG: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG after writing HW_CFG_BIR: 0x%08x
  ",
  		  buf);

  
  	if (!turbo_mode) {
  		buf = 0;
  		dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
  	} else if (dev->udev->speed == USB_SPEED_HIGH) {
  		buf = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
  		dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
  	} else {
  		buf = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
  		dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
  	}

  	netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld
  ",
  		  (ulong)dev->rx_urb_size);

  
  	ret = smsc75xx_write_reg(dev, BURST_CAP, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write BURST_CAP: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_read_reg(dev, BURST_CAP, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read BURST_CAP: %d
  ", ret);
  		return ret;
  	}

  
  	netif_dbg(dev, ifup, dev->net,

  		  "Read Value from BURST_CAP after writing: 0x%08x
  ", buf);

  
  	ret = smsc75xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write BULK_IN_DLY: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_read_reg(dev, BULK_IN_DLY, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read BULK_IN_DLY: %d
  ", ret);
  		return ret;
  	}

  
  	netif_dbg(dev, ifup, dev->net,

  		  "Read Value from BULK_IN_DLY after writing: 0x%08x
  ", buf);

  
  	if (turbo_mode) {
  		ret = smsc75xx_read_reg(dev, HW_CFG, &buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to read HW_CFG: %d
  ", ret);
  			return ret;
  		}

  		netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x
  ", buf);

  
  		buf |= (HW_CFG_MEF | HW_CFG_BCE);
  
  		ret = smsc75xx_write_reg(dev, HW_CFG, buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to write HW_CFG: %d
  ", ret);
  			return ret;
  		}

  
  		ret = smsc75xx_read_reg(dev, HW_CFG, &buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to read HW_CFG: %d
  ", ret);
  			return ret;
  		}

  		netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x
  ", buf);

  	}
  
  	/* set FIFO sizes */
  	buf = (MAX_RX_FIFO_SIZE - 512) / 512;
  	ret = smsc75xx_write_reg(dev, FCT_RX_FIFO_END, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write FCT_RX_FIFO_END: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "FCT_RX_FIFO_END set to 0x%08x
  ", buf);

  
  	buf = (MAX_TX_FIFO_SIZE - 512) / 512;
  	ret = smsc75xx_write_reg(dev, FCT_TX_FIFO_END, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write FCT_TX_FIFO_END: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "FCT_TX_FIFO_END set to 0x%08x
  ", buf);

  
  	ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write INT_STS: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_read_reg(dev, ID_REV, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read ID_REV: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x
  ", buf);

  	ret = smsc75xx_read_reg(dev, E2P_CMD, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read E2P_CMD: %d
  ", ret);
  		return ret;
  	}

  	/* only set default GPIO/LED settings if no EEPROM is detected */
  	if (!(buf & E2P_CMD_LOADED)) {
  		ret = smsc75xx_read_reg(dev, LED_GPIO_CFG, &buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to read LED_GPIO_CFG: %d
  ", ret);
  			return ret;
  		}

  		buf &= ~(LED_GPIO_CFG_LED2_FUN_SEL | LED_GPIO_CFG_LED10_FUN_SEL);
  		buf |= LED_GPIO_CFG_LEDGPIO_EN | LED_GPIO_CFG_LED2_FUN_SEL;
  
  		ret = smsc75xx_write_reg(dev, LED_GPIO_CFG, buf);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Failed to write LED_GPIO_CFG: %d
  ", ret);
  			return ret;
  		}

  	}

  
  	ret = smsc75xx_write_reg(dev, FLOW, 0);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write FLOW: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, FCT_FLOW, 0);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write FCT_FLOW: %d
  ", ret);
  		return ret;
  	}

  
  	/* Don't need rfe_ctl_lock during initialisation */
  	ret = smsc75xx_read_reg(dev, RFE_CTL, &pdata->rfe_ctl);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read RFE_CTL: %d
  ", ret);
  		return ret;
  	}

  
  	pdata->rfe_ctl |= RFE_CTL_AB | RFE_CTL_DPF;
  
  	ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write RFE_CTL: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_read_reg(dev, RFE_CTL, &pdata->rfe_ctl);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read RFE_CTL: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "RFE_CTL set to 0x%08x
  ",
  		  pdata->rfe_ctl);

  
  	/* Enable or disable checksum offload engines */

  	smsc75xx_set_features(dev->net, dev->net->features);

  
  	smsc75xx_set_multicast(dev->net);
  
  	ret = smsc75xx_phy_initialize(dev);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to initialize PHY: %d
  ", ret);
  		return ret;
  	}

  
  	ret = smsc75xx_read_reg(dev, INT_EP_CTL, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read INT_EP_CTL: %d
  ", ret);
  		return ret;
  	}

  
  	/* enable PHY interrupts */
  	buf |= INT_ENP_PHY_INT;
  
  	ret = smsc75xx_write_reg(dev, INT_EP_CTL, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write INT_EP_CTL: %d
  ", ret);
  		return ret;
  	}

  	/* allow mac to detect speed and duplex from phy */
  	ret = smsc75xx_read_reg(dev, MAC_CR, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read MAC_CR: %d
  ", ret);
  		return ret;
  	}

  
  	buf |= (MAC_CR_ADD | MAC_CR_ASD);
  	ret = smsc75xx_write_reg(dev, MAC_CR, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write MAC_CR: %d
  ", ret);
  		return ret;
  	}

  	ret = smsc75xx_read_reg(dev, MAC_TX, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read MAC_TX: %d
  ", ret);
  		return ret;
  	}

  
  	buf |= MAC_TX_TXEN;
  
  	ret = smsc75xx_write_reg(dev, MAC_TX, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write MAC_TX: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "MAC_TX set to 0x%08x
  ", buf);

  
  	ret = smsc75xx_read_reg(dev, FCT_TX_CTL, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read FCT_TX_CTL: %d
  ", ret);
  		return ret;
  	}

  
  	buf |= FCT_TX_CTL_EN;
  
  	ret = smsc75xx_write_reg(dev, FCT_TX_CTL, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write FCT_TX_CTL: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "FCT_TX_CTL set to 0x%08x
  ", buf);

  	ret = smsc75xx_set_rx_max_frame_length(dev, dev->net->mtu + ETH_HLEN);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to set max rx frame length
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_read_reg(dev, MAC_RX, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read MAC_RX: %d
  ", ret);
  		return ret;
  	}

  
  	buf |= MAC_RX_RXEN;
  
  	ret = smsc75xx_write_reg(dev, MAC_RX, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write MAC_RX: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "MAC_RX set to 0x%08x
  ", buf);

  
  	ret = smsc75xx_read_reg(dev, FCT_RX_CTL, &buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read FCT_RX_CTL: %d
  ", ret);
  		return ret;
  	}

  
  	buf |= FCT_RX_CTL_EN;
  
  	ret = smsc75xx_write_reg(dev, FCT_RX_CTL, buf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write FCT_RX_CTL: %d
  ", ret);
  		return ret;
  	}

  	netif_dbg(dev, ifup, dev->net, "FCT_RX_CTL set to 0x%08x
  ", buf);

  	netif_dbg(dev, ifup, dev->net, "smsc75xx_reset, return 0
  ");

  	return 0;
  }
  
  static const struct net_device_ops smsc75xx_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		= smsc75xx_change_mtu,
  	.ndo_set_mac_address 	= eth_mac_addr,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_do_ioctl 		= smsc75xx_ioctl,

  	.ndo_set_rx_mode	= smsc75xx_set_multicast,

  	.ndo_set_features	= smsc75xx_set_features,

  };
  
  static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
  {
  	struct smsc75xx_priv *pdata = NULL;
  	int ret;
  
  	printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "
  ");
  
  	ret = usbnet_get_endpoints(dev, intf);

  	if (ret < 0) {
  		netdev_warn(dev->net, "usbnet_get_endpoints failed: %d
  ", ret);
  		return ret;
  	}

  
  	dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc75xx_priv),

  					      GFP_KERNEL);

  
  	pdata = (struct smsc75xx_priv *)(dev->data[0]);

  	if (!pdata)

  		return -ENOMEM;

  
  	pdata->dev = dev;
  
  	spin_lock_init(&pdata->rfe_ctl_lock);
  	mutex_init(&pdata->dataport_mutex);
  
  	INIT_WORK(&pdata->set_multicast, smsc75xx_deferred_multicast_write);

  	if (DEFAULT_TX_CSUM_ENABLE)

  		dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;

  	if (DEFAULT_RX_CSUM_ENABLE)
  		dev->net->features |= NETIF_F_RXCSUM;

  	dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |

  				NETIF_F_RXCSUM;

  	ret = smsc75xx_wait_ready(dev, 0);
  	if (ret < 0) {
  		netdev_warn(dev->net, "device not ready in smsc75xx_bind
  ");
  		return ret;
  	}
  
  	smsc75xx_init_mac_address(dev);

  	/* Init all registers */
  	ret = smsc75xx_reset(dev);

  	if (ret < 0) {
  		netdev_warn(dev->net, "smsc75xx_reset error %d
  ", ret);
  		return ret;
  	}

  
  	dev->net->netdev_ops = &smsc75xx_netdev_ops;
  	dev->net->ethtool_ops = &smsc75xx_ethtool_ops;
  	dev->net->flags |= IFF_MULTICAST;
  	dev->net->hard_header_len += SMSC75XX_TX_OVERHEAD;

  	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;

  	return 0;
  }
  
  static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)
  {
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
  	if (pdata) {

  		netif_dbg(dev, ifdown, dev->net, "free pdata
  ");

  		kfree(pdata);
  		pdata = NULL;
  		dev->data[0] = 0;
  	}
  }

  static u16 smsc_crc(const u8 *buffer, size_t len)
  {
  	return bitrev16(crc16(0xFFFF, buffer, len));
  }
  
  static int smsc75xx_write_wuff(struct usbnet *dev, int filter, u32 wuf_cfg,
  			       u32 wuf_mask1)
  {
  	int cfg_base = WUF_CFGX + filter * 4;
  	int mask_base = WUF_MASKX + filter * 16;
  	int ret;
  
  	ret = smsc75xx_write_reg(dev, cfg_base, wuf_cfg);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing WUF_CFGX
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, mask_base, wuf_mask1);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing WUF_MASKX
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, mask_base + 4, 0);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing WUF_MASKX
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, mask_base + 8, 0);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing WUF_MASKX
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_write_reg(dev, mask_base + 12, 0);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing WUF_MASKX
  ");
  		return ret;
  	}

  
  	return 0;
  }

  static int smsc75xx_enter_suspend0(struct usbnet *dev)
  {

  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

  	u32 val;
  	int ret;
  
  	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  		return ret;
  	}

  
  	val &= (~(PMT_CTL_SUS_MODE | PMT_CTL_PHY_RST));
  	val |= PMT_CTL_SUS_MODE_0 | PMT_CTL_WOL_EN | PMT_CTL_WUPS;
  
  	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  		return ret;
  	}

  	pdata->suspend_flags |= SUSPEND_SUSPEND0;

  	return 0;
  }

  static int smsc75xx_enter_suspend1(struct usbnet *dev)
  {

  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

  	u32 val;
  	int ret;
  
  	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  		return ret;
  	}

  
  	val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
  	val |= PMT_CTL_SUS_MODE_1;
  
  	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  		return ret;
  	}

  
  	/* clear wol status, enable energy detection */
  	val &= ~PMT_CTL_WUPS;
  	val |= (PMT_CTL_WUPS_ED | PMT_CTL_ED_EN);
  
  	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  		return ret;
  	}

  	pdata->suspend_flags |= SUSPEND_SUSPEND1;

  	return 0;
  }

  static int smsc75xx_enter_suspend2(struct usbnet *dev)
  {

  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

  	u32 val;
  	int ret;
  
  	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  		return ret;
  	}

  
  	val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
  	val |= PMT_CTL_SUS_MODE_2;
  
  	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  		return ret;
  	}

  	pdata->suspend_flags |= SUSPEND_SUSPEND2;
  
  	return 0;
  }
  
  static int smsc75xx_enter_suspend3(struct usbnet *dev)
  {
  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
  	u32 val;
  	int ret;
  
  	ret = smsc75xx_read_reg_nopm(dev, FCT_RX_CTL, &val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading FCT_RX_CTL
  ");
  		return ret;
  	}

  
  	if (val & FCT_RX_CTL_RXUSED) {
  		netdev_dbg(dev->net, "rx fifo not empty in autosuspend
  ");
  		return -EBUSY;
  	}
  
  	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  		return ret;
  	}

  
  	val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
  	val |= PMT_CTL_SUS_MODE_3 | PMT_CTL_RES_CLR_WKP_EN;
  
  	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  		return ret;
  	}

  
  	/* clear wol status */
  	val &= ~PMT_CTL_WUPS;
  	val |= PMT_CTL_WUPS_WOL;
  
  	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  		return ret;
  	}

  	pdata->suspend_flags |= SUSPEND_SUSPEND3;

  	return 0;
  }

  static int smsc75xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
  {
  	struct mii_if_info *mii = &dev->mii;
  	int ret;
  
  	netdev_dbg(dev->net, "enabling PHY wakeup interrupts
  ");
  
  	/* read to clear */
  	ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_SRC);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading PHY_INT_SRC
  ");
  		return ret;
  	}

  
  	/* enable interrupt source */
  	ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_MASK);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading PHY_INT_MASK
  ");
  		return ret;
  	}

  
  	ret |= mask;
  
  	smsc75xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_INT_MASK, ret);
  
  	return 0;
  }
  
  static int smsc75xx_link_ok_nopm(struct usbnet *dev)
  {
  	struct mii_if_info *mii = &dev->mii;
  	int ret;
  
  	/* first, a dummy read, needed to latch some MII phys */
  	ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading MII_BMSR
  ");
  		return ret;
  	}

  
  	ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading MII_BMSR
  ");
  		return ret;
  	}

  
  	return !!(ret & BMSR_LSTATUS);
  }

  static int smsc75xx_autosuspend(struct usbnet *dev, u32 link_up)
  {
  	int ret;
  
  	if (!netif_running(dev->net)) {
  		/* interface is ifconfig down so fully power down hw */
  		netdev_dbg(dev->net, "autosuspend entering SUSPEND2
  ");
  		return smsc75xx_enter_suspend2(dev);
  	}
  
  	if (!link_up) {
  		/* link is down so enter EDPD mode */
  		netdev_dbg(dev->net, "autosuspend entering SUSPEND1
  ");
  
  		/* enable PHY wakeup events for if cable is attached */
  		ret = smsc75xx_enable_phy_wakeup_interrupts(dev,
  			PHY_INT_MASK_ANEG_COMP);

  		if (ret < 0) {
  			netdev_warn(dev->net, "error enabling PHY wakeup ints
  ");
  			return ret;
  		}

  
  		netdev_info(dev->net, "entering SUSPEND1 mode
  ");
  		return smsc75xx_enter_suspend1(dev);
  	}
  
  	/* enable PHY wakeup events so we remote wakeup if cable is pulled */
  	ret = smsc75xx_enable_phy_wakeup_interrupts(dev,
  		PHY_INT_MASK_LINK_DOWN);

  	if (ret < 0) {
  		netdev_warn(dev->net, "error enabling PHY wakeup ints
  ");
  		return ret;
  	}

  
  	netdev_dbg(dev->net, "autosuspend entering SUSPEND3
  ");
  	return smsc75xx_enter_suspend3(dev);
  }

  static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);

  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

  	u32 val, link_up;

  	int ret;

  	ret = usbnet_suspend(intf, message);

  	if (ret < 0) {
  		netdev_warn(dev->net, "usbnet_suspend error
  ");
  		return ret;
  	}

  	if (pdata->suspend_flags) {
  		netdev_warn(dev->net, "error during last resume
  ");
  		pdata->suspend_flags = 0;
  	}

  	/* determine if link is up using only _nopm functions */
  	link_up = smsc75xx_link_ok_nopm(dev);

  	if (message.event == PM_EVENT_AUTO_SUSPEND) {
  		ret = smsc75xx_autosuspend(dev, link_up);
  		goto done;
  	}
  
  	/* if we get this far we're not autosuspending */

  	/* if no wol options set, or if link is down and we're not waking on
  	 * PHY activity, enter lowest power SUSPEND2 mode
  	 */
  	if (!(pdata->wolopts & SUPPORTED_WAKE) ||
  		!(link_up || (pdata->wolopts & WAKE_PHY))) {

  		netdev_info(dev->net, "entering SUSPEND2 mode
  ");

  
  		/* disable energy detect (link up) & wake up events */

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			goto done;
  		}

  
  		val &= ~(WUCSR_MPEN | WUCSR_WUEN);

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			goto done;
  		}

  		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  			goto done;
  		}

  
  		val &= ~(PMT_CTL_ED_EN | PMT_CTL_WOL_EN);

  		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  			goto done;
  		}

  		ret = smsc75xx_enter_suspend2(dev);
  		goto done;

  	}

  	if (pdata->wolopts & WAKE_PHY) {
  		ret = smsc75xx_enable_phy_wakeup_interrupts(dev,
  			(PHY_INT_MASK_ANEG_COMP | PHY_INT_MASK_LINK_DOWN));

  		if (ret < 0) {
  			netdev_warn(dev->net, "error enabling PHY wakeup ints
  ");
  			goto done;
  		}

  
  		/* if link is down then configure EDPD and enter SUSPEND1,
  		 * otherwise enter SUSPEND0 below
  		 */
  		if (!link_up) {
  			struct mii_if_info *mii = &dev->mii;
  			netdev_info(dev->net, "entering SUSPEND1 mode
  ");
  
  			/* enable energy detect power-down mode */
  			ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id,
  				PHY_MODE_CTRL_STS);

  			if (ret < 0) {
  				netdev_warn(dev->net, "Error reading PHY_MODE_CTRL_STS
  ");
  				goto done;
  			}

  
  			ret |= MODE_CTRL_STS_EDPWRDOWN;
  
  			smsc75xx_mdio_write_nopm(dev->net, mii->phy_id,
  				PHY_MODE_CTRL_STS, ret);
  
  			/* enter SUSPEND1 mode */

  			ret = smsc75xx_enter_suspend1(dev);
  			goto done;

  		}
  	}

  	if (pdata->wolopts & (WAKE_MCAST | WAKE_ARP)) {
  		int i, filter = 0;
  
  		/* disable all filters */
  		for (i = 0; i < WUF_NUM; i++) {

  			ret = smsc75xx_write_reg_nopm(dev, WUF_CFGX + i * 4, 0);

  			if (ret < 0) {
  				netdev_warn(dev->net, "Error writing WUF_CFGX
  ");
  				goto done;
  			}

  		}
  
  		if (pdata->wolopts & WAKE_MCAST) {
  			const u8 mcast[] = {0x01, 0x00, 0x5E};

  			netdev_info(dev->net, "enabling multicast detection
  ");

  
  			val = WUF_CFGX_EN | WUF_CFGX_ATYPE_MULTICAST
  				| smsc_crc(mcast, 3);
  			ret = smsc75xx_write_wuff(dev, filter++, val, 0x0007);

  			if (ret < 0) {
  				netdev_warn(dev->net, "Error writing wakeup filter
  ");
  				goto done;
  			}

  		}
  
  		if (pdata->wolopts & WAKE_ARP) {
  			const u8 arp[] = {0x08, 0x06};

  			netdev_info(dev->net, "enabling ARP detection
  ");

  
  			val = WUF_CFGX_EN | WUF_CFGX_ATYPE_ALL | (0x0C << 16)
  				| smsc_crc(arp, 2);
  			ret = smsc75xx_write_wuff(dev, filter++, val, 0x0003);

  			if (ret < 0) {
  				netdev_warn(dev->net, "Error writing wakeup filter
  ");
  				goto done;
  			}

  		}
  
  		/* clear any pending pattern match packet status */

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			goto done;
  		}

  
  		val |= WUCSR_WUFR;

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			goto done;
  		}

  		netdev_info(dev->net, "enabling packet match detection
  ");

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			goto done;
  		}

  
  		val |= WUCSR_WUEN;

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			goto done;
  		}

  	} else {

  		netdev_info(dev->net, "disabling packet match detection
  ");

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			goto done;
  		}

  		val &= ~WUCSR_WUEN;

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			goto done;
  		}

  	}

  	/* disable magic, bcast & unicast wakeup sources */

  	ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error reading WUCSR
  ");
  		goto done;
  	}

  	val &= ~(WUCSR_MPEN | WUCSR_BCST_EN | WUCSR_PFDA_EN);

  	ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Error writing WUCSR
  ");
  		goto done;
  	}

  	if (pdata->wolopts & WAKE_PHY) {
  		netdev_info(dev->net, "enabling PHY wakeup
  ");
  
  		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  			goto done;
  		}

  
  		/* clear wol status, enable energy detection */
  		val &= ~PMT_CTL_WUPS;
  		val |= (PMT_CTL_WUPS_ED | PMT_CTL_ED_EN);
  
  		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  			goto done;
  		}

  	}

  	if (pdata->wolopts & WAKE_MAGIC) {

  		netdev_info(dev->net, "enabling magic packet wakeup
  ");

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			goto done;
  		}

  
  		/* clear any pending magic packet status */
  		val |= WUCSR_MPR | WUCSR_MPEN;

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			goto done;
  		}

  	}

  	if (pdata->wolopts & WAKE_BCAST) {

  		netdev_info(dev->net, "enabling broadcast detection
  ");

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			goto done;
  		}

  		val |= WUCSR_BCAST_FR | WUCSR_BCST_EN;

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			goto done;
  		}

  	}

  	if (pdata->wolopts & WAKE_UCAST) {

  		netdev_info(dev->net, "enabling unicast detection
  ");

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			goto done;
  		}

  
  		val |= WUCSR_WUFR | WUCSR_PFDA_EN;

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			goto done;
  		}

  	}
  
  	/* enable receiver to enable frame reception */

  	ret = smsc75xx_read_reg_nopm(dev, MAC_RX, &val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to read MAC_RX: %d
  ", ret);
  		goto done;
  	}

  
  	val |= MAC_RX_RXEN;

  	ret = smsc75xx_write_reg_nopm(dev, MAC_RX, val);

  	if (ret < 0) {
  		netdev_warn(dev->net, "Failed to write MAC_RX: %d
  ", ret);
  		goto done;
  	}

  
  	/* some wol options are enabled, so enter SUSPEND0 */

  	netdev_info(dev->net, "entering SUSPEND0 mode
  ");

  	ret = smsc75xx_enter_suspend0(dev);
  
  done:

  	/*
  	 * TODO: resume() might need to handle the suspend failure
  	 * in system sleep
  	 */
  	if (ret && PMSG_IS_AUTO(message))

  		usbnet_resume(intf);
  	return ret;

  }
  
  static int smsc75xx_resume(struct usb_interface *intf)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);

  	struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

  	u8 suspend_flags = pdata->suspend_flags;

  	int ret;
  	u32 val;

  	netdev_dbg(dev->net, "resume suspend_flags=0x%02x
  ", suspend_flags);

  	/* do this first to ensure it's cleared even in error case */
  	pdata->suspend_flags = 0;

  	if (suspend_flags & SUSPEND_ALLMODES) {

  		/* Disable wakeup sources */

  		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading WUCSR
  ");
  			return ret;
  		}

  		val &= ~(WUCSR_WUEN | WUCSR_MPEN | WUCSR_PFDA_EN
  			| WUCSR_BCST_EN);

  		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing WUCSR
  ");
  			return ret;
  		}

  
  		/* clear wake-up status */

  		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  			return ret;
  		}

  
  		val &= ~PMT_CTL_WOL_EN;
  		val |= PMT_CTL_WUPS;

  		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  			return ret;
  		}

  	}
  
  	if (suspend_flags & SUSPEND_SUSPEND2) {

  		netdev_info(dev->net, "resuming from SUSPEND2
  ");

  		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error reading PMT_CTL
  ");
  			return ret;
  		}

  
  		val |= PMT_CTL_PHY_PWRUP;

  		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

  		if (ret < 0) {
  			netdev_warn(dev->net, "Error writing PMT_CTL
  ");
  			return ret;
  		}

  	}

  	ret = smsc75xx_wait_ready(dev, 1);

  	if (ret < 0) {
  		netdev_warn(dev->net, "device not ready in smsc75xx_resume
  ");
  		return ret;
  	}

  
  	return usbnet_resume(intf);
  }

  static void smsc75xx_rx_csum_offload(struct usbnet *dev, struct sk_buff *skb,
  				     u32 rx_cmd_a, u32 rx_cmd_b)

  {

  	if (!(dev->net->features & NETIF_F_RXCSUM) ||
  	    unlikely(rx_cmd_a & RX_CMD_A_LCSM)) {

  		skb->ip_summed = CHECKSUM_NONE;
  	} else {
  		skb->csum = ntohs((u16)(rx_cmd_b >> RX_CMD_B_CSUM_SHIFT));
  		skb->ip_summed = CHECKSUM_COMPLETE;
  	}
  }
  
  static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
  {

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

  	while (skb->len > 0) {
  		u32 rx_cmd_a, rx_cmd_b, align_count, size;
  		struct sk_buff *ax_skb;
  		unsigned char *packet;
  
  		memcpy(&rx_cmd_a, skb->data, sizeof(rx_cmd_a));
  		le32_to_cpus(&rx_cmd_a);
  		skb_pull(skb, 4);
  
  		memcpy(&rx_cmd_b, skb->data, sizeof(rx_cmd_b));
  		le32_to_cpus(&rx_cmd_b);

  		skb_pull(skb, 4 + RXW_PADDING);

  
  		packet = skb->data;
  
  		/* get the packet length */

  		size = (rx_cmd_a & RX_CMD_A_LEN) - RXW_PADDING;
  		align_count = (4 - ((size + RXW_PADDING) % 4)) % 4;

  
  		if (unlikely(rx_cmd_a & RX_CMD_A_RED)) {
  			netif_dbg(dev, rx_err, dev->net,

  				  "Error rx_cmd_a=0x%08x
  ", rx_cmd_a);

  			dev->net->stats.rx_errors++;
  			dev->net->stats.rx_dropped++;
  
  			if (rx_cmd_a & RX_CMD_A_FCS)
  				dev->net->stats.rx_crc_errors++;
  			else if (rx_cmd_a & (RX_CMD_A_LONG | RX_CMD_A_RUNT))
  				dev->net->stats.rx_frame_errors++;
  		} else {

  			/* MAX_SINGLE_PACKET_SIZE + 4(CRC) + 2(COE) + 4(Vlan) */
  			if (unlikely(size > (MAX_SINGLE_PACKET_SIZE + ETH_HLEN + 12))) {

  				netif_dbg(dev, rx_err, dev->net,

  					  "size err rx_cmd_a=0x%08x
  ",
  					  rx_cmd_a);

  				return 0;
  			}
  
  			/* last frame in this batch */
  			if (skb->len == size) {

  				smsc75xx_rx_csum_offload(dev, skb, rx_cmd_a,
  					rx_cmd_b);

  
  				skb_trim(skb, skb->len - 4); /* remove fcs */
  				skb->truesize = size + sizeof(struct sk_buff);
  
  				return 1;
  			}
  
  			ax_skb = skb_clone(skb, GFP_ATOMIC);
  			if (unlikely(!ax_skb)) {

  				netdev_warn(dev->net, "Error allocating skb
  ");

  				return 0;
  			}
  
  			ax_skb->len = size;
  			ax_skb->data = packet;
  			skb_set_tail_pointer(ax_skb, size);

  			smsc75xx_rx_csum_offload(dev, ax_skb, rx_cmd_a,
  				rx_cmd_b);

  
  			skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
  			ax_skb->truesize = size + sizeof(struct sk_buff);
  
  			usbnet_skb_return(dev, ax_skb);
  		}
  
  		skb_pull(skb, size);
  
  		/* padding bytes before the next frame starts */
  		if (skb->len)
  			skb_pull(skb, align_count);
  	}

  	return 1;
  }
  
  static struct sk_buff *smsc75xx_tx_fixup(struct usbnet *dev,
  					 struct sk_buff *skb, gfp_t flags)
  {
  	u32 tx_cmd_a, tx_cmd_b;

  	if (skb_headroom(skb) < SMSC75XX_TX_OVERHEAD) {
  		struct sk_buff *skb2 =
  			skb_copy_expand(skb, SMSC75XX_TX_OVERHEAD, 0, flags);
  		dev_kfree_skb_any(skb);
  		skb = skb2;
  		if (!skb)
  			return NULL;
  	}
  
  	tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;
  
  	if (skb->ip_summed == CHECKSUM_PARTIAL)
  		tx_cmd_a |= TX_CMD_A_IPE | TX_CMD_A_TPE;
  
  	if (skb_is_gso(skb)) {
  		u16 mss = max(skb_shinfo(skb)->gso_size, TX_MSS_MIN);
  		tx_cmd_b = (mss << TX_CMD_B_MSS_SHIFT) & TX_CMD_B_MSS;
  
  		tx_cmd_a |= TX_CMD_A_LSO;
  	} else {
  		tx_cmd_b = 0;
  	}
  
  	skb_push(skb, 4);
  	cpu_to_le32s(&tx_cmd_b);
  	memcpy(skb->data, &tx_cmd_b, 4);
  
  	skb_push(skb, 4);
  	cpu_to_le32s(&tx_cmd_a);
  	memcpy(skb->data, &tx_cmd_a, 4);
  
  	return skb;
  }

  static int smsc75xx_manage_power(struct usbnet *dev, int on)
  {
  	dev->intf->needs_remote_wakeup = on;
  	return 0;
  }

  static const struct driver_info smsc75xx_info = {
  	.description	= "smsc75xx USB 2.0 Gigabit Ethernet",
  	.bind		= smsc75xx_bind,
  	.unbind		= smsc75xx_unbind,
  	.link_reset	= smsc75xx_link_reset,
  	.reset		= smsc75xx_reset,
  	.rx_fixup	= smsc75xx_rx_fixup,
  	.tx_fixup	= smsc75xx_tx_fixup,
  	.status		= smsc75xx_status,

  	.manage_power	= smsc75xx_manage_power,

  	.flags		= FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,

  };
  
  static const struct usb_device_id products[] = {
  	{
  		/* SMSC7500 USB Gigabit Ethernet Device */
  		USB_DEVICE(USB_VENDOR_ID_SMSC, USB_PRODUCT_ID_LAN7500),
  		.driver_info = (unsigned long) &smsc75xx_info,
  	},
  	{
  		/* SMSC7500 USB Gigabit Ethernet Device */
  		USB_DEVICE(USB_VENDOR_ID_SMSC, USB_PRODUCT_ID_LAN7505),
  		.driver_info = (unsigned long) &smsc75xx_info,
  	},
  	{ },		/* END */
  };
  MODULE_DEVICE_TABLE(usb, products);
  
  static struct usb_driver smsc75xx_driver = {
  	.name		= SMSC_CHIPNAME,
  	.id_table	= products,
  	.probe		= usbnet_probe,