/***************************************************************************
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *****************************************************************************/

#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/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 "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 DEFAULT_TSO_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\n",
                            index, 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\n",
                            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\n");
                        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\n");
                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\n");
                goto done;
        }

        ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);
        if (ret < 0) {
                netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
                goto done;
        }

        ret = __smsc75xx_read_reg(dev, MII_DATA, &val, in_pm);
        if (ret < 0) {
                netdev_warn(dev->net, "Error reading MII_DATA\n");
                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\n");
                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\n");
                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\n");
                goto done;
        }

        ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);
        if (ret < 0) {
                netdev_warn(dev->net, "Timed out writing MII reg %02X\n", 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\n");
                        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\n");
                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\n");
                        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\n");
        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\n");
                        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\n");
                        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\n");
                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\n");
                        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\n");
                        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\n");
                        return ret;
                }

                if (dp_sel & DP_SEL_DPRDY)
                        return 0;

                udelay(40);
        }

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

        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\n");
                goto done;
        }

        ret = smsc75xx_read_reg(dev, DP_SEL, &dp_sel);
        if (ret < 0) {
                netdev_warn(dev->net, "Error reading DP_SEL\n");
                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\n");
                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\n");
                        goto done;
                }

                ret = smsc75xx_write_reg(dev, DP_DATA, buf[i]);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error writing DP_DATA\n");
                        goto done;
                }

                ret = smsc75xx_write_reg(dev, DP_CMD, DP_CMD_WRITE);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error writing DP_CMD\n");
                        goto done;
                }

                ret = smsc75xx_dataport_wait_not_busy(dev);
                if (ret < 0) {
                        netdev_warn(dev->net, "smsc75xx_dataport_write timeout\n");
                        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\n",
                  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\n");
}

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\n");
                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\n");
                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\n");

                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\n");
                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\n",
                          (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
                          (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));
        } else {
                netif_dbg(dev, link, dev->net, "half duplex\n");
        }

        ret = smsc75xx_write_reg(dev, FLOW, flow);
        if (ret < 0) {
                netdev_warn(dev->net, "Error writing FLOW\n");
                return ret;
        }

        ret = smsc75xx_write_reg(dev, FCT_FLOW, fct_flow);
        if (ret < 0) {
                netdev_warn(dev->net, "Error writing FCT_FLOW\n");
                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\n");
                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\n",
                  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\n",
                            urb->actual_length);
                return;
        }

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

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

        if (intdata & INT_ENP_PHY_INT)
                usbnet_defer_kevent(dev, EVENT_LINK_RESET);
        else
                netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
                            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\n",
                            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\n", 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)
{
        /* 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\n");
                        return;
                }
        }

        /* no eeprom, or eeprom values are invalid. generate random MAC */
        eth_hw_addr_random(dev->net);
        netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
}

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\n", 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\n", 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\n", 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\n", 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\n");
                        return bmcr;
                }
                timeout++;
        } while ((bmcr & BMCR_RESET) && (timeout < 100));

        if (timeout >= 100) {
                netdev_warn(dev->net, "timeout on PHY Reset\n");
                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\n");
                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\n");
        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\n", 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\n", 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\n", 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\n", 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\n");
                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\n");

        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\n", 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\n");
        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\n");

        ret = smsc75xx_wait_ready(dev, 0);
        if (ret < 0) {
                netdev_warn(dev->net, "device not ready in smsc75xx_reset\n");
                return ret;
        }

        ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", 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\n", 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\n", ret);
                        return ret;
                }
                timeout++;
        } while ((buf & HW_CFG_LRST) && (timeout < 100));

        if (timeout >= 100) {
                netdev_warn(dev->net, "timeout on completion of Lite Reset\n");
                return -EIO;
        }

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

        ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n", 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\n", 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\n", ret);
                        return ret;
                }
                timeout++;
        } while ((buf & PMT_CTL_PHY_RST) && (timeout < 100));

        if (timeout >= 100) {
                netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
                return -EIO;
        }

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

        ret = smsc75xx_set_mac_address(dev);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to set mac address\n");
                return ret;
        }

        netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
                  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\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
                  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\n", ret);
                return ret;
        }

        ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG after writing HW_CFG_BIR: 0x%08x\n",
                  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\n",
                  (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\n", ret);
                return ret;
        }

        ret = smsc75xx_read_reg(dev, BURST_CAP, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read BURST_CAP: %d\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net,
                  "Read Value from BURST_CAP after writing: 0x%08x\n", 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\n", 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\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net,
                  "Read Value from BULK_IN_DLY after writing: 0x%08x\n", 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\n", ret);
                        return ret;
                }

                netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x\n", 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\n", ret);
                        return ret;
                }

                ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
                if (ret < 0) {
                        netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
                        return ret;
                }

                netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x\n", 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\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net, "FCT_RX_FIFO_END set to 0x%08x\n", 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\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net, "FCT_TX_FIFO_END set to 0x%08x\n", 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\n", ret);
                return ret;
        }

        ret = smsc75xx_read_reg(dev, ID_REV, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read ID_REV: %d\n", ret);
                return ret;
        }

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

        ret = smsc75xx_read_reg(dev, E2P_CMD, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read E2P_CMD: %d\n", 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\n", 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\n", ret);
                        return ret;
                }
        }

        ret = smsc75xx_write_reg(dev, FLOW, 0);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to write FLOW: %d\n", ret);
                return ret;
        }

        ret = smsc75xx_write_reg(dev, FCT_FLOW, 0);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to write FCT_FLOW: %d\n", 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\n", 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\n", 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\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net, "RFE_CTL set to 0x%08x\n",
                  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\n", 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\n", 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\n", 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\n", 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\n", ret);
                return ret;
        }

        ret = smsc75xx_read_reg(dev, MAC_TX, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read MAC_TX: %d\n", 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\n", ret);
                return ret;
        }

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

        ret = smsc75xx_read_reg(dev, FCT_TX_CTL, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read FCT_TX_CTL: %d\n", 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\n", ret);
                return ret;
        }

        netif_dbg(dev, ifup, dev->net, "FCT_TX_CTL set to 0x%08x\n", 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\n");
                return ret;
        }

        ret = smsc75xx_read_reg(dev, MAC_RX, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read MAC_RX: %d\n", 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\n", ret);
                return ret;
        }

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

        ret = smsc75xx_read_reg(dev, FCT_RX_CTL, &buf);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to read FCT_RX_CTL: %d\n", 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\n", ret);
                return ret;
        }

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

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

        ret = usbnet_get_endpoints(dev, intf);
        if (ret < 0) {
                netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", 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_TSO_ENABLE)
                        dev->net->features |= NETIF_F_SG |
                                NETIF_F_TSO | NETIF_F_TSO6;
        }
        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_SG | NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_RXCSUM;

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

        ret = smsc75xx_write_reg(dev, mask_base, wuf_mask1);
        if (ret < 0) {
                netdev_warn(dev->net, "Error writing WUF_MASKX\n");
                return ret;
        }

        ret = smsc75xx_write_reg(dev, mask_base + 4, 0);
        if (ret < 0) {
                netdev_warn(dev->net, "Error writing WUF_MASKX\n");
                return ret;
        }

        ret = smsc75xx_write_reg(dev, mask_base + 8, 0);
        if (ret < 0) {
                netdev_warn(dev->net, "Error writing WUF_MASKX\n");
                return ret;
        }

        ret = smsc75xx_write_reg(dev, mask_base + 12, 0);
        if (ret < 0) {
                netdev_warn(dev->net, "Error writing WUF_MASKX\n");
                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\n");
                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\n");
                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\n");
                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\n");
                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\n");
                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\n");
                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\n");
                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\n");
                return ret;
        }

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

        ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
        if (ret < 0) {
                netdev_warn(dev->net, "Error reading PMT_CTL\n");
                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\n");
                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\n");
                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\n");

        /* 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\n");
                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\n");
                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\n");
                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\n");
                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\n");
                return smsc75xx_enter_suspend2(dev);
        }

        if (!link_up) {
                /* link is down so enter EDPD mode */
                netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");

                /* 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\n");
                        return ret;
                }

                netdev_info(dev->net, "entering SUSPEND1 mode\n");
                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\n");
                return ret;
        }

        netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
        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\n");
                return ret;
        }

        if (pdata->suspend_flags) {
                netdev_warn(dev->net, "error during last resume\n");
                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\n");

                /* 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\n");
                        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\n");
                        goto done;
                }

                ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading PMT_CTL\n");
                        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\n");
                        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\n");
                        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\n");

                        /* 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\n");
                                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\n");
                                goto done;
                        }
                }

                if (pdata->wolopts & WAKE_MCAST) {
                        const u8 mcast[] = {0x01, 0x00, 0x5E};
                        netdev_info(dev->net, "enabling multicast detection\n");

                        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\n");
                                goto done;
                        }
                }

                if (pdata->wolopts & WAKE_ARP) {
                        const u8 arp[] = {0x08, 0x06};
                        netdev_info(dev->net, "enabling ARP detection\n");

                        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\n");
                                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\n");
                        goto done;
                }

                val |= WUCSR_WUFR;

                ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error writing WUCSR\n");
                        goto done;
                }

                netdev_info(dev->net, "enabling packet match detection\n");
                ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading WUCSR\n");
                        goto done;
                }

                val |= WUCSR_WUEN;

                ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error writing WUCSR\n");
                        goto done;
                }
        } else {
                netdev_info(dev->net, "disabling packet match detection\n");
                ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading WUCSR\n");
                        goto done;
                }

                val &= ~WUCSR_WUEN;

                ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error writing WUCSR\n");
                        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\n");
                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\n");
                goto done;
        }

        if (pdata->wolopts & WAKE_PHY) {
                netdev_info(dev->net, "enabling PHY wakeup\n");

                ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading PMT_CTL\n");
                        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\n");
                        goto done;
                }
        }

        if (pdata->wolopts & WAKE_MAGIC) {
                netdev_info(dev->net, "enabling magic packet wakeup\n");
                ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading WUCSR\n");
                        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\n");
                        goto done;
                }
        }

        if (pdata->wolopts & WAKE_BCAST) {
                netdev_info(dev->net, "enabling broadcast detection\n");
                ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading WUCSR\n");
                        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\n");
                        goto done;
                }
        }

        if (pdata->wolopts & WAKE_UCAST) {
                netdev_info(dev->net, "enabling unicast detection\n");
                ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading WUCSR\n");
                        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\n");
                        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\n", 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\n", ret);
                goto done;
        }

        /* some wol options are enabled, so enter SUSPEND0 */
        netdev_info(dev->net, "entering SUSPEND0 mode\n");
        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\n", 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\n");
                        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\n");
                        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\n");
                        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\n");
                        return ret;
                }
        }

        if (suspend_flags & SUSPEND_SUSPEND2) {
                netdev_info(dev->net, "resuming from SUSPEND2\n");

                ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
                if (ret < 0) {
                        netdev_warn(dev->net, "Error reading PMT_CTL\n");
                        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\n");
                        return ret;
                }
        }

        ret = smsc75xx_wait_ready(dev, 1);
        if (ret < 0) {
                netdev_warn(dev->net, "device not ready in smsc75xx_resume\n");
                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)
{
        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\n", 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\n",
                                          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\n");
                                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);
        }

        if (unlikely(skb->len < 0)) {
                netdev_warn(dev->net, "invalid rx length<0 %d\n", skb->len);
                return 0;
        }

        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;

        skb_linearize(skb);

        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,
        .suspend        = smsc75xx_suspend,
        .resume         = smsc75xx_resume,
        .reset_resume   = smsc75xx_resume,
        .disconnect     = usbnet_disconnect,
        .disable_hub_initiated_lpm = 1,
        .supports_autosuspend = 1,
};

module_usb_driver(smsc75xx_driver);

MODULE_AUTHOR("Nancy Lin");
MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
MODULE_DESCRIPTION("SMSC75XX USB 2.0 Gigabit Ethernet Devices");
MODULE_LICENSE("GPL");