/*
 * ASIX AX88179/178A USB 3.0/2.0 to Gigabit Ethernet Devices
 *
 * Copyright (C) 2011-2013 ASIX
 *
 * 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/etherdevice.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/crc32.h>
#include <linux/usb/usbnet.h>

#define AX88179_PHY_ID                          0x03
#define AX_EEPROM_LEN                           0x100
#define AX88179_EEPROM_MAGIC                    0x17900b95
#define AX_MCAST_FLTSIZE                        8
#define AX_MAX_MCAST                            64
#define AX_INT_PPLS_LINK                        ((u32)BIT(16))
#define AX_RXHDR_L4_TYPE_MASK                   0x1c
#define AX_RXHDR_L4_TYPE_UDP                    4
#define AX_RXHDR_L4_TYPE_TCP                    16
#define AX_RXHDR_L3CSUM_ERR                     2
#define AX_RXHDR_L4CSUM_ERR                     1
#define AX_RXHDR_CRC_ERR                        ((u32)BIT(31))
#define AX_RXHDR_DROP_ERR                       ((u32)BIT(30))
#define AX_ACCESS_MAC                           0x01
#define AX_ACCESS_PHY                           0x02
#define AX_ACCESS_EEPROM                        0x04
#define AX_ACCESS_EFUS                          0x05
#define AX_PAUSE_WATERLVL_HIGH                  0x54
#define AX_PAUSE_WATERLVL_LOW                   0x55

#define PHYSICAL_LINK_STATUS                    0x02
        #define AX_USB_SS               0x04
        #define AX_USB_HS               0x02

#define GENERAL_STATUS                          0x03
/* Check AX88179 version. UA1:Bit2 = 0,  UA2:Bit2 = 1 */
        #define AX_SECLD                0x04

#define AX_SROM_ADDR                            0x07
#define AX_SROM_CMD                             0x0a
        #define EEP_RD                  0x04
        #define EEP_BUSY                0x10

#define AX_SROM_DATA_LOW                        0x08
#define AX_SROM_DATA_HIGH                       0x09

#define AX_RX_CTL                               0x0b
        #define AX_RX_CTL_DROPCRCERR    0x0100
        #define AX_RX_CTL_IPE           0x0200
        #define AX_RX_CTL_START         0x0080
        #define AX_RX_CTL_AP            0x0020
        #define AX_RX_CTL_AM            0x0010
        #define AX_RX_CTL_AB            0x0008
        #define AX_RX_CTL_AMALL         0x0002
        #define AX_RX_CTL_PRO           0x0001
        #define AX_RX_CTL_STOP          0x0000

#define AX_NODE_ID                              0x10
#define AX_MULFLTARY                            0x16

#define AX_MEDIUM_STATUS_MODE                   0x22
        #define AX_MEDIUM_GIGAMODE      0x01
        #define AX_MEDIUM_FULL_DUPLEX   0x02
        #define AX_MEDIUM_ALWAYS_ONE    0x04
        #define AX_MEDIUM_EN_125MHZ     0x08
        #define AX_MEDIUM_RXFLOW_CTRLEN 0x10
        #define AX_MEDIUM_TXFLOW_CTRLEN 0x20
        #define AX_MEDIUM_RECEIVE_EN    0x100
        #define AX_MEDIUM_PS            0x200
        #define AX_MEDIUM_JUMBO_EN      0x8040

#define AX_MONITOR_MOD                          0x24
        #define AX_MONITOR_MODE_RWLC    0x02
        #define AX_MONITOR_MODE_RWMP    0x04
        #define AX_MONITOR_MODE_PMEPOL  0x20
        #define AX_MONITOR_MODE_PMETYPE 0x40

#define AX_GPIO_CTRL                            0x25
        #define AX_GPIO_CTRL_GPIO3EN    0x80
        #define AX_GPIO_CTRL_GPIO2EN    0x40
        #define AX_GPIO_CTRL_GPIO1EN    0x20

#define AX_PHYPWR_RSTCTL                        0x26
        #define AX_PHYPWR_RSTCTL_BZ     0x0010
        #define AX_PHYPWR_RSTCTL_IPRL   0x0020
        #define AX_PHYPWR_RSTCTL_AT     0x1000

#define AX_RX_BULKIN_QCTRL                      0x2e
#define AX_CLK_SELECT                           0x33
        #define AX_CLK_SELECT_BCS       0x01
        #define AX_CLK_SELECT_ACS       0x02
        #define AX_CLK_SELECT_ULR       0x08

#define AX_RXCOE_CTL                            0x34
        #define AX_RXCOE_IP             0x01
        #define AX_RXCOE_TCP            0x02
        #define AX_RXCOE_UDP            0x04
        #define AX_RXCOE_TCPV6          0x20
        #define AX_RXCOE_UDPV6          0x40

#define AX_TXCOE_CTL                            0x35
        #define AX_TXCOE_IP             0x01
        #define AX_TXCOE_TCP            0x02
        #define AX_TXCOE_UDP            0x04
        #define AX_TXCOE_TCPV6          0x20
        #define AX_TXCOE_UDPV6          0x40

#define AX_LEDCTRL                              0x73

#define GMII_PHY_PHYSR                          0x11
        #define GMII_PHY_PHYSR_SMASK    0xc000
        #define GMII_PHY_PHYSR_GIGA     0x8000
        #define GMII_PHY_PHYSR_100      0x4000
        #define GMII_PHY_PHYSR_FULL     0x2000
        #define GMII_PHY_PHYSR_LINK     0x400

#define GMII_LED_ACT                            0x1a
        #define GMII_LED_ACTIVE_MASK    0xff8f
        #define GMII_LED0_ACTIVE        BIT(4)
        #define GMII_LED1_ACTIVE        BIT(5)
        #define GMII_LED2_ACTIVE        BIT(6)

#define GMII_LED_LINK                           0x1c
        #define GMII_LED_LINK_MASK      0xf888
        #define GMII_LED0_LINK_10       BIT(0)
        #define GMII_LED0_LINK_100      BIT(1)
        #define GMII_LED0_LINK_1000     BIT(2)
        #define GMII_LED1_LINK_10       BIT(4)
        #define GMII_LED1_LINK_100      BIT(5)
        #define GMII_LED1_LINK_1000     BIT(6)
        #define GMII_LED2_LINK_10       BIT(8)
        #define GMII_LED2_LINK_100      BIT(9)
        #define GMII_LED2_LINK_1000     BIT(10)
        #define LED0_ACTIVE             BIT(0)
        #define LED0_LINK_10            BIT(1)
        #define LED0_LINK_100           BIT(2)
        #define LED0_LINK_1000          BIT(3)
        #define LED0_FD                 BIT(4)
        #define LED0_USB3_MASK          0x001f
        #define LED1_ACTIVE             BIT(5)
        #define LED1_LINK_10            BIT(6)
        #define LED1_LINK_100           BIT(7)
        #define LED1_LINK_1000          BIT(8)
        #define LED1_FD                 BIT(9)
        #define LED1_USB3_MASK          0x03e0
        #define LED2_ACTIVE             BIT(10)
        #define LED2_LINK_1000          BIT(13)
        #define LED2_LINK_100           BIT(12)
        #define LED2_LINK_10            BIT(11)
        #define LED2_FD                 BIT(14)
        #define LED_VALID               BIT(15)
        #define LED2_USB3_MASK          0x7c00

#define GMII_PHYPAGE                            0x1e
#define GMII_PHY_PAGE_SELECT                    0x1f
        #define GMII_PHY_PGSEL_EXT      0x0007
        #define GMII_PHY_PGSEL_PAGE0    0x0000

struct ax88179_data {
        u16 rxctl;
        u16 reserved;
};

struct ax88179_int_data {
        __le32 intdata1;
        __le32 intdata2;
};

static const struct {
        unsigned char ctrl, timer_l, timer_h, size, ifg;
} AX88179_BULKIN_SIZE[] =       {
        {7, 0x4f, 0,    0x12, 0xff},
        {7, 0x20, 3,    0x16, 0xff},
        {7, 0xae, 7,    0x18, 0xff},
        {7, 0xcc, 0x4c, 0x18, 8},
};

static int __ax88179_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
                              u16 size, void *data, int in_pm)
{
        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, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                 value, index, data, size);

        if (unlikely(ret < 0))
                netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
                            index, ret);

        return ret;
}

static int __ax88179_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
                               u16 size, void *data, int in_pm)
{
        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;

        ret = fn(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                 value, index, data, size);

        if (unlikely(ret < 0))
                netdev_warn(dev->net, "Failed to write reg index 0x%04x: %d\n",
                            index, ret);

        return ret;
}

static void ax88179_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value,
                                    u16 index, u16 size, void *data)
{
        u16 buf;

        if (2 == size) {
                buf = *((u16 *)data);
                cpu_to_le16s(&buf);
                usbnet_write_cmd_async(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR |
                                       USB_RECIP_DEVICE, value, index, &buf,
                                       size);
        } else {
                usbnet_write_cmd_async(dev, cmd, USB_DIR_OUT | USB_TYPE_VENDOR |
                                       USB_RECIP_DEVICE, value, index, data,
                                       size);
        }
}

static int ax88179_read_cmd_nopm(struct usbnet *dev, u8 cmd, u16 value,
                                 u16 index, u16 size, void *data)
{
        int ret;

        if (2 == size) {
                u16 buf;
                ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 1);
                le16_to_cpus(&buf);
                *((u16 *)data) = buf;
        } else if (4 == size) {
                u32 buf;
                ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 1);
                le32_to_cpus(&buf);
                *((u32 *)data) = buf;
        } else {
                ret = __ax88179_read_cmd(dev, cmd, value, index, size, data, 1);
        }

        return ret;
}

static int ax88179_write_cmd_nopm(struct usbnet *dev, u8 cmd, u16 value,
                                  u16 index, u16 size, void *data)
{
        int ret;

        if (2 == size) {
                u16 buf;
                buf = *((u16 *)data);
                cpu_to_le16s(&buf);
                ret = __ax88179_write_cmd(dev, cmd, value, index,
                                          size, &buf, 1);
        } else {
                ret = __ax88179_write_cmd(dev, cmd, value, index,
                                          size, data, 1);
        }

        return ret;
}

static int ax88179_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
                            u16 size, void *data)
{
        int ret;

        if (2 == size) {
                u16 buf;
                ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 0);
                le16_to_cpus(&buf);
                *((u16 *)data) = buf;
        } else if (4 == size) {
                u32 buf;
                ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 0);
                le32_to_cpus(&buf);
                *((u32 *)data) = buf;
        } else {
                ret = __ax88179_read_cmd(dev, cmd, value, index, size, data, 0);
        }

        return ret;
}

static int ax88179_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
                             u16 size, void *data)
{
        int ret;

        if (2 == size) {
                u16 buf;
                buf = *((u16 *)data);
                cpu_to_le16s(&buf);
                ret = __ax88179_write_cmd(dev, cmd, value, index,
                                          size, &buf, 0);
        } else {
                ret = __ax88179_write_cmd(dev, cmd, value, index,
                                          size, data, 0);
        }

        return ret;
}

static void ax88179_status(struct usbnet *dev, struct urb *urb)
{
        struct ax88179_int_data *event;
        u32 link;

        if (urb->actual_length < 8)
                return;

        event = urb->transfer_buffer;
        le32_to_cpus((void *)&event->intdata1);

        link = (((__force u32)event->intdata1) & AX_INT_PPLS_LINK) >> 16;

        if (netif_carrier_ok(dev->net) != link) {
                usbnet_link_change(dev, link, 1);
                netdev_info(dev->net, "ax88179 - Link status is: %d\n", link);
        }
}

static int ax88179_mdio_read(struct net_device *netdev, int phy_id, int loc)
{
        struct usbnet *dev = netdev_priv(netdev);
        u16 res;

        ax88179_read_cmd(dev, AX_ACCESS_PHY, phy_id, (__u16)loc, 2, &res);
        return res;
}

static void ax88179_mdio_write(struct net_device *netdev, int phy_id, int loc,
                               int val)
{
        struct usbnet *dev = netdev_priv(netdev);
        u16 res = (u16) val;

        ax88179_write_cmd(dev, AX_ACCESS_PHY, phy_id, (__u16)loc, 2, &res);
}

static int ax88179_suspend(struct usb_interface *intf, pm_message_t message)
{
        struct usbnet *dev = usb_get_intfdata(intf);
        u16 tmp16;
        u8 tmp8;

        usbnet_suspend(intf, message);

        /* Disable RX path */
        ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                              2, 2, &tmp16);
        tmp16 &= ~AX_MEDIUM_RECEIVE_EN;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                               2, 2, &tmp16);

        /* Force bulk-in zero length */
        ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL,
                              2, 2, &tmp16);

        tmp16 |= AX_PHYPWR_RSTCTL_BZ | AX_PHYPWR_RSTCTL_IPRL;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL,
                               2, 2, &tmp16);

        /* change clock */
        tmp8 = 0;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);

        /* Configure RX control register => stop operation */
        tmp16 = AX_RX_CTL_STOP;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_RX_CTL, 2, 2, &tmp16);

        return 0;
}

/* This function is used to enable the autodetach function. */
/* This function is determined by offset 0x43 of EEPROM */
static int ax88179_auto_detach(struct usbnet *dev, int in_pm)
{
        u16 tmp16;
        u8 tmp8;
        int (*fnr)(struct usbnet *, u8, u16, u16, u16, void *);
        int (*fnw)(struct usbnet *, u8, u16, u16, u16, void *);

        if (!in_pm) {
                fnr = ax88179_read_cmd;
                fnw = ax88179_write_cmd;
        } else {
                fnr = ax88179_read_cmd_nopm;
                fnw = ax88179_write_cmd_nopm;
        }

        if (fnr(dev, AX_ACCESS_EEPROM, 0x43, 1, 2, &tmp16) < 0)
                return 0;

        if ((tmp16 == 0xFFFF) || (!(tmp16 & 0x0100)))
                return 0;

        /* Enable Auto Detach bit */
        tmp8 = 0;
        fnr(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
        tmp8 |= AX_CLK_SELECT_ULR;
        fnw(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);

        fnr(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, &tmp16);
        tmp16 |= AX_PHYPWR_RSTCTL_AT;
        fnw(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, &tmp16);

        return 0;
}

static int ax88179_resume(struct usb_interface *intf)
{
        struct usbnet *dev = usb_get_intfdata(intf);
        u16 tmp16;
        u8 tmp8;

        usbnet_link_change(dev, 0, 0);

        /* Power up ethernet PHY */
        tmp16 = 0;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL,
                               2, 2, &tmp16);
        udelay(1000);

        tmp16 = AX_PHYPWR_RSTCTL_IPRL;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL,
                               2, 2, &tmp16);
        msleep(200);

        /* Ethernet PHY Auto Detach*/
        ax88179_auto_detach(dev, 1);

        /* Enable clock */
        ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC,  AX_CLK_SELECT, 1, 1, &tmp8);
        tmp8 |= AX_CLK_SELECT_ACS | AX_CLK_SELECT_BCS;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
        msleep(100);

        /* Configure RX control register => start operation */
        tmp16 = AX_RX_CTL_DROPCRCERR | AX_RX_CTL_IPE | AX_RX_CTL_START |
                AX_RX_CTL_AP | AX_RX_CTL_AMALL | AX_RX_CTL_AB;
        ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_RX_CTL, 2, 2, &tmp16);

        return usbnet_resume(intf);
}

static void
ax88179_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
{
        struct usbnet *dev = netdev_priv(net);
        u8 opt;

        if (ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD,
                             1, 1, &opt) < 0) {
                wolinfo->supported = 0;
                wolinfo->wolopts = 0;
                return;
        }

        wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
        wolinfo->wolopts = 0;
        if (opt & AX_MONITOR_MODE_RWLC)
                wolinfo->wolopts |= WAKE_PHY;
        if (opt & AX_MONITOR_MODE_RWMP)
                wolinfo->wolopts |= WAKE_MAGIC;
}

static int
ax88179_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
{
        struct usbnet *dev = netdev_priv(net);
        u8 opt = 0;

        if (wolinfo->wolopts & WAKE_PHY)
                opt |= AX_MONITOR_MODE_RWLC;
        if (wolinfo->wolopts & WAKE_MAGIC)
                opt |= AX_MONITOR_MODE_RWMP;

        if (ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD,
                              1, 1, &opt) < 0)
                return -EINVAL;

        return 0;
}

static int ax88179_get_eeprom_len(struct net_device *net)
{
        return AX_EEPROM_LEN;
}

static int
ax88179_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
                   u8 *data)
{
        struct usbnet *dev = netdev_priv(net);
        u16 *eeprom_buff;
        int first_word, last_word;
        int i, ret;

        if (eeprom->len == 0)
                return -EINVAL;

        eeprom->magic = AX88179_EEPROM_MAGIC;

        first_word = eeprom->offset >> 1;
        last_word = (eeprom->offset + eeprom->len - 1) >> 1;
        eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
                              GFP_KERNEL);
        if (!eeprom_buff)
                return -ENOMEM;

        /* ax88179/178A returns 2 bytes from eeprom on read */
        for (i = first_word; i <= last_word; i++) {
                ret = __ax88179_read_cmd(dev, AX_ACCESS_EEPROM, i, 1, 2,
                                         &eeprom_buff[i - first_word],
                                         0);
                if (ret < 0) {
                        kfree(eeprom_buff);
                        return -EIO;
                }
        }

        memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
        kfree(eeprom_buff);
        return 0;
}

static int ax88179_get_settings(struct net_device *net, struct ethtool_cmd *cmd)
{
        struct usbnet *dev = netdev_priv(net);
        return mii_ethtool_gset(&dev->mii, cmd);
}

static int ax88179_set_settings(struct net_device *net, struct ethtool_cmd *cmd)
{
        struct usbnet *dev = netdev_priv(net);
        return mii_ethtool_sset(&dev->mii, cmd);
}


static int ax88179_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
{
        struct usbnet *dev = netdev_priv(net);
        return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
}

static const struct ethtool_ops ax88179_ethtool_ops = {
        .get_link               = ethtool_op_get_link,
        .get_msglevel           = usbnet_get_msglevel,
        .set_msglevel           = usbnet_set_msglevel,
        .get_wol                = ax88179_get_wol,
        .set_wol                = ax88179_set_wol,
        .get_eeprom_len         = ax88179_get_eeprom_len,
        .get_eeprom             = ax88179_get_eeprom,
        .get_settings           = ax88179_get_settings,
        .set_settings           = ax88179_set_settings,
        .nway_reset             = usbnet_nway_reset,
};

static void ax88179_set_multicast(struct net_device *net)
{
        struct usbnet *dev = netdev_priv(net);
        struct ax88179_data *data = (struct ax88179_data *)dev->data;
        u8 *m_filter = ((u8 *)dev->data) + 12;

        data->rxctl = (AX_RX_CTL_START | AX_RX_CTL_AB | AX_RX_CTL_IPE);

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

                memset(m_filter, 0, AX_MCAST_FLTSIZE);

                netdev_for_each_mc_addr(ha, net) {
                        crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
                        *(m_filter + (crc_bits >> 3)) |= (1 << (crc_bits & 7));
                }

                ax88179_write_cmd_async(dev, AX_ACCESS_MAC, AX_MULFLTARY,
                                        AX_MCAST_FLTSIZE, AX_MCAST_FLTSIZE,
                                        m_filter);

                data->rxctl |= AX_RX_CTL_AM;
        }

        ax88179_write_cmd_async(dev, AX_ACCESS_MAC, AX_RX_CTL,
                                2, 2, &data->rxctl);
}

static int
ax88179_set_features(struct net_device *net, netdev_features_t features)
{
        u8 tmp;
        struct usbnet *dev = netdev_priv(net);
        netdev_features_t changed = net->features ^ features;

        if (changed & NETIF_F_IP_CSUM) {
                ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
                tmp ^= AX_TXCOE_TCP | AX_TXCOE_UDP;
                ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
        }

        if (changed & NETIF_F_IPV6_CSUM) {
                ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
                tmp ^= AX_TXCOE_TCPV6 | AX_TXCOE_UDPV6;
                ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
        }

        if (changed & NETIF_F_RXCSUM) {
                ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL, 1, 1, &tmp);
                tmp ^= AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
                       AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6;
                ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL, 1, 1, &tmp);
        }

        return 0;
}

static int ax88179_change_mtu(struct net_device *net, int new_mtu)
{
        struct usbnet *dev = netdev_priv(net);
        u16 tmp16;

        if (new_mtu <= 0 || new_mtu > 4088)
                return -EINVAL;

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

        if (net->mtu > 1500) {
                ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                                 2, 2, &tmp16);
                tmp16 |= AX_MEDIUM_JUMBO_EN;
                ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                                  2, 2, &tmp16);
        } else {
                ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                                 2, 2, &tmp16);
                tmp16 &= ~AX_MEDIUM_JUMBO_EN;
                ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                                  2, 2, &tmp16);
        }

        return 0;
}

static int ax88179_set_mac_addr(struct net_device *net, void *p)
{
        struct usbnet *dev = netdev_priv(net);
        struct sockaddr *addr = p;

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

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

        /* Set the MAC address */
        return ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_NODE_ID, ETH_ALEN,
                                 ETH_ALEN, net->dev_addr);
}

static const struct net_device_ops ax88179_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         = ax88179_change_mtu,
        .ndo_set_mac_address    = ax88179_set_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_do_ioctl           = ax88179_ioctl,
        .ndo_set_rx_mode        = ax88179_set_multicast,
        .ndo_set_features       = ax88179_set_features,
};

static int ax88179_check_eeprom(struct usbnet *dev)
{
        u8 i, buf, eeprom[20];
        u16 csum, delay = HZ / 10;
        unsigned long jtimeout;

        /* Read EEPROM content */
        for (i = 0; i < 6; i++) {
                buf = i;
                if (ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_SROM_ADDR,
                                      1, 1, &buf) < 0)
                        return -EINVAL;

                buf = EEP_RD;
                if (ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
                                      1, 1, &buf) < 0)
                        return -EINVAL;

                jtimeout = jiffies + delay;
                do {
                        ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
                                         1, 1, &buf);

                        if (time_after(jiffies, jtimeout))
                                return -EINVAL;

                } while (buf & EEP_BUSY);

                __ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_LOW,
                                   2, 2, &eeprom[i * 2], 0);

                if ((i == 0) && (eeprom[0] == 0xFF))
                        return -EINVAL;
        }

        csum = eeprom[6] + eeprom[7] + eeprom[8] + eeprom[9];
        csum = (csum >> 8) + (csum & 0xff);
        if ((csum + eeprom[10]) != 0xff)
                return -EINVAL;

        return 0;
}

static int ax88179_check_efuse(struct usbnet *dev, u16 *ledmode)
{
        u8      i;
        u8      efuse[64];
        u16     csum = 0;

        if (ax88179_read_cmd(dev, AX_ACCESS_EFUS, 0, 64, 64, efuse) < 0)
                return -EINVAL;

        if (*efuse == 0xFF)
                return -EINVAL;

        for (i = 0; i < 64; i++)
                csum = csum + efuse[i];

        while (csum > 255)
                csum = (csum & 0x00FF) + ((csum >> 8) & 0x00FF);

        if (csum != 0xFF)
                return -EINVAL;

        *ledmode = (efuse[51] << 8) | efuse[52];

        return 0;
}

static int ax88179_convert_old_led(struct usbnet *dev, u16 *ledvalue)
{
        u16 led;

        /* Loaded the old eFuse LED Mode */
        if (ax88179_read_cmd(dev, AX_ACCESS_EEPROM, 0x3C, 1, 2, &led) < 0)
                return -EINVAL;

        led >>= 8;
        switch (led) {
        case 0xFF:
                led = LED0_ACTIVE | LED1_LINK_10 | LED1_LINK_100 |
                      LED1_LINK_1000 | LED2_ACTIVE | LED2_LINK_10 |
                      LED2_LINK_100 | LED2_LINK_1000 | LED_VALID;
                break;
        case 0xFE:
                led = LED0_ACTIVE | LED1_LINK_1000 | LED2_LINK_100 | LED_VALID;
                break;
        case 0xFD:
                led = LED0_ACTIVE | LED1_LINK_1000 | LED2_LINK_100 |
                      LED2_LINK_10 | LED_VALID;
                break;
        case 0xFC:
                led = LED0_ACTIVE | LED1_ACTIVE | LED1_LINK_1000 | LED2_ACTIVE |
                      LED2_LINK_100 | LED2_LINK_10 | LED_VALID;
                break;
        default:
                led = LED0_ACTIVE | LED1_LINK_10 | LED1_LINK_100 |
                      LED1_LINK_1000 | LED2_ACTIVE | LED2_LINK_10 |
                      LED2_LINK_100 | LED2_LINK_1000 | LED_VALID;
                break;
        }

        *ledvalue = led;

        return 0;
}

static int ax88179_led_setting(struct usbnet *dev)
{
        u8 ledfd, value = 0;
        u16 tmp, ledact, ledlink, ledvalue = 0, delay = HZ / 10;
        unsigned long jtimeout;

        /* Check AX88179 version. UA1 or UA2*/
        ax88179_read_cmd(dev, AX_ACCESS_MAC, GENERAL_STATUS, 1, 1, &value);

        if (!(value & AX_SECLD)) {      /* UA1 */
                value = AX_GPIO_CTRL_GPIO3EN | AX_GPIO_CTRL_GPIO2EN |
                        AX_GPIO_CTRL_GPIO1EN;
                if (ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_GPIO_CTRL,
                                      1, 1, &value) < 0)
                        return -EINVAL;
        }

        /* Check EEPROM */
        if (!ax88179_check_eeprom(dev)) {
                value = 0x42;
                if (ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_SROM_ADDR,
                                      1, 1, &value) < 0)
                        return -EINVAL;

                value = EEP_RD;
                if (ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
                                      1, 1, &value) < 0)
                        return -EINVAL;

                jtimeout = jiffies + delay;
                do {
                        ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
                                         1, 1, &value);

                        if (time_after(jiffies, jtimeout))
                                return -EINVAL;

                } while (value & EEP_BUSY);

                ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_HIGH,
                                 1, 1, &value);
                ledvalue = (value << 8);

                ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_LOW,
                                 1, 1, &value);
                ledvalue |= value;

                /* load internal ROM for defaule setting */
                if ((ledvalue == 0xFFFF) || ((ledvalue & LED_VALID) == 0))
                        ax88179_convert_old_led(dev, &ledvalue);

        } else if (!ax88179_check_efuse(dev, &ledvalue)) {
                if ((ledvalue == 0xFFFF) || ((ledvalue & LED_VALID) == 0))
                        ax88179_convert_old_led(dev, &ledvalue);
        } else {
                ax88179_convert_old_led(dev, &ledvalue);
        }

        tmp = GMII_PHY_PGSEL_EXT;
        ax88179_write_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                          GMII_PHY_PAGE_SELECT, 2, &tmp);

        tmp = 0x2c;
        ax88179_write_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                          GMII_PHYPAGE, 2, &tmp);

        ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                         GMII_LED_ACT, 2, &ledact);

        ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                         GMII_LED_LINK, 2, &ledlink);

        ledact &= GMII_LED_ACTIVE_MASK;
        ledlink &= GMII_LED_LINK_MASK;

        if (ledvalue & LED0_ACTIVE)
                ledact |= GMII_LED0_ACTIVE;

        if (ledvalue & LED1_ACTIVE)
                ledact |= GMII_LED1_ACTIVE;

        if (ledvalue & LED2_ACTIVE)
                ledact |= GMII_LED2_ACTIVE;

        if (ledvalue & LED0_LINK_10)
                ledlink |= GMII_LED0_LINK_10;

        if (ledvalue & LED1_LINK_10)
                ledlink |= GMII_LED1_LINK_10;

        if (ledvalue & LED2_LINK_10)
                ledlink |= GMII_LED2_LINK_10;

        if (ledvalue & LED0_LINK_100)
                ledlink |= GMII_LED0_LINK_100;

        if (ledvalue & LED1_LINK_100)
                ledlink |= GMII_LED1_LINK_100;

        if (ledvalue & LED2_LINK_100)
                ledlink |= GMII_LED2_LINK_100;

        if (ledvalue & LED0_LINK_1000)
                ledlink |= GMII_LED0_LINK_1000;

        if (ledvalue & LED1_LINK_1000)
                ledlink |= GMII_LED1_LINK_1000;

        if (ledvalue & LED2_LINK_1000)
                ledlink |= GMII_LED2_LINK_1000;

        tmp = ledact;
        ax88179_write_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                          GMII_LED_ACT, 2, &tmp);

        tmp = ledlink;
        ax88179_write_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                          GMII_LED_LINK, 2, &tmp);

        tmp = GMII_PHY_PGSEL_PAGE0;
        ax88179_write_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                          GMII_PHY_PAGE_SELECT, 2, &tmp);

        /* LED full duplex setting */
        ledfd = 0;
        if (ledvalue & LED0_FD)
                ledfd |= 0x01;
        else if ((ledvalue & LED0_USB3_MASK) == 0)
                ledfd |= 0x02;

        if (ledvalue & LED1_FD)
                ledfd |= 0x04;
        else if ((ledvalue & LED1_USB3_MASK) == 0)
                ledfd |= 0x08;

        if (ledvalue & LED2_FD)
                ledfd |= 0x10;
        else if ((ledvalue & LED2_USB3_MASK) == 0)
                ledfd |= 0x20;

        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_LEDCTRL, 1, 1, &ledfd);

        return 0;
}

static int ax88179_bind(struct usbnet *dev, struct usb_interface *intf)
{
        u8 buf[5];
        u16 *tmp16;
        u8 *tmp;
        struct ax88179_data *ax179_data = (struct ax88179_data *)dev->data;

        usbnet_get_endpoints(dev, intf);

        tmp16 = (u16 *)buf;
        tmp = (u8 *)buf;

        memset(ax179_data, 0, sizeof(*ax179_data));

        /* Power up ethernet PHY */
        *tmp16 = 0;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, tmp16);
        *tmp16 = AX_PHYPWR_RSTCTL_IPRL;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, tmp16);
        msleep(200);

        *tmp = AX_CLK_SELECT_ACS | AX_CLK_SELECT_BCS;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, tmp);
        msleep(100);

        ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_NODE_ID, ETH_ALEN,
                         ETH_ALEN, dev->net->dev_addr);
        memcpy(dev->net->perm_addr, dev->net->dev_addr, ETH_ALEN);

        /* RX bulk configuration */
        memcpy(tmp, &AX88179_BULKIN_SIZE[0], 5);
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_BULKIN_QCTRL, 5, 5, tmp);

        dev->rx_urb_size = 1024 * 20;

        *tmp = 0x34;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PAUSE_WATERLVL_LOW, 1, 1, tmp);

        *tmp = 0x52;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PAUSE_WATERLVL_HIGH,
                          1, 1, tmp);

        dev->net->netdev_ops = &ax88179_netdev_ops;
        dev->net->ethtool_ops = &ax88179_ethtool_ops;
        dev->net->needed_headroom = 8;

        /* Initialize MII structure */
        dev->mii.dev = dev->net;
        dev->mii.mdio_read = ax88179_mdio_read;
        dev->mii.mdio_write = ax88179_mdio_write;
        dev->mii.phy_id_mask = 0xff;
        dev->mii.reg_num_mask = 0xff;
        dev->mii.phy_id = 0x03;
        dev->mii.supports_gmii = 1;

        dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                              NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO;

        dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                                 NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO;

        /* Enable checksum offload */
        *tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
               AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL, 1, 1, tmp);

        *tmp = AX_TXCOE_IP | AX_TXCOE_TCP | AX_TXCOE_UDP |
               AX_TXCOE_TCPV6 | AX_TXCOE_UDPV6;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, tmp);

        /* Configure RX control register => start operation */
        *tmp16 = AX_RX_CTL_DROPCRCERR | AX_RX_CTL_IPE | AX_RX_CTL_START |
                 AX_RX_CTL_AP | AX_RX_CTL_AMALL | AX_RX_CTL_AB;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_CTL, 2, 2, tmp16);

        *tmp = AX_MONITOR_MODE_PMETYPE | AX_MONITOR_MODE_PMEPOL |
               AX_MONITOR_MODE_RWMP;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD, 1, 1, tmp);

        /* Configure default medium type => giga */
        *tmp16 = AX_MEDIUM_RECEIVE_EN | AX_MEDIUM_TXFLOW_CTRLEN |
                 AX_MEDIUM_RXFLOW_CTRLEN | AX_MEDIUM_ALWAYS_ONE |
                 AX_MEDIUM_FULL_DUPLEX | AX_MEDIUM_GIGAMODE;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                          2, 2, tmp16);

        ax88179_led_setting(dev);

        /* Restart autoneg */
        mii_nway_restart(&dev->mii);

        usbnet_link_change(dev, 0, 0);

        return 0;
}

static void ax88179_unbind(struct usbnet *dev, struct usb_interface *intf)
{
        u16 tmp16;

        /* Configure RX control register => stop operation */
        tmp16 = AX_RX_CTL_STOP;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_CTL, 2, 2, &tmp16);

        tmp16 = 0;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp16);

        /* Power down ethernet PHY */
        tmp16 = 0;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, &tmp16);
}

static void
ax88179_rx_checksum(struct sk_buff *skb, u32 *pkt_hdr)
{
        skb->ip_summed = CHECKSUM_NONE;

        /* checksum error bit is set */
        if ((*pkt_hdr & AX_RXHDR_L3CSUM_ERR) ||
            (*pkt_hdr & AX_RXHDR_L4CSUM_ERR))
                return;

        /* It must be a TCP or UDP packet with a valid checksum */
        if (((*pkt_hdr & AX_RXHDR_L4_TYPE_MASK) == AX_RXHDR_L4_TYPE_TCP) ||
            ((*pkt_hdr & AX_RXHDR_L4_TYPE_MASK) == AX_RXHDR_L4_TYPE_UDP))
                skb->ip_summed = CHECKSUM_UNNECESSARY;
}

static int ax88179_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
        struct sk_buff *ax_skb;
        int pkt_cnt;
        u32 rx_hdr;
        u16 hdr_off;
        u32 *pkt_hdr;

        skb_trim(skb, skb->len - 4);
        memcpy(&rx_hdr, skb_tail_pointer(skb), 4);
        le32_to_cpus(&rx_hdr);

        pkt_cnt = (u16)rx_hdr;
        hdr_off = (u16)(rx_hdr >> 16);
        pkt_hdr = (u32 *)(skb->data + hdr_off);

        while (pkt_cnt--) {
                u16 pkt_len;

                le32_to_cpus(pkt_hdr);
                pkt_len = (*pkt_hdr >> 16) & 0x1fff;

                /* Check CRC or runt packet */
                if ((*pkt_hdr & AX_RXHDR_CRC_ERR) ||
                    (*pkt_hdr & AX_RXHDR_DROP_ERR)) {
                        skb_pull(skb, (pkt_len + 7) & 0xFFF8);
                        pkt_hdr++;
                        continue;
                }

                if (pkt_cnt == 0) {
                        /* Skip IP alignment psudo header */
                        skb_pull(skb, 2);
                        skb->len = pkt_len;
                        skb_set_tail_pointer(skb, pkt_len);
                        skb->truesize = pkt_len + sizeof(struct sk_buff);
                        ax88179_rx_checksum(skb, pkt_hdr);
                        return 1;
                }

                ax_skb = skb_clone(skb, GFP_ATOMIC);
                if (ax_skb) {
                        ax_skb->len = pkt_len;
                        ax_skb->data = skb->data + 2;
                        skb_set_tail_pointer(ax_skb, pkt_len);
                        ax_skb->truesize = pkt_len + sizeof(struct sk_buff);
                        ax88179_rx_checksum(ax_skb, pkt_hdr);
                        usbnet_skb_return(dev, ax_skb);
                } else {
                        return 0;
                }

                skb_pull(skb, (pkt_len + 7) & 0xFFF8);
                pkt_hdr++;
        }
        return 1;
}

static struct sk_buff *
ax88179_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
        u32 tx_hdr1, tx_hdr2;
        int frame_size = dev->maxpacket;
        int mss = skb_shinfo(skb)->gso_size;
        int headroom;
        int tailroom;

        tx_hdr1 = skb->len;
        tx_hdr2 = mss;
        if (((skb->len + 8) % frame_size) == 0)
                tx_hdr2 |= 0x80008000;  /* Enable padding */

        skb_linearize(skb);
        headroom = skb_headroom(skb);
        tailroom = skb_tailroom(skb);

        if (!skb_header_cloned(skb) &&
            !skb_cloned(skb) &&
            (headroom + tailroom) >= 8) {
                if (headroom < 8) {
                        skb->data = memmove(skb->head + 8, skb->data, skb->len);
                        skb_set_tail_pointer(skb, skb->len);
                }
        } else {
                struct sk_buff *skb2;

                skb2 = skb_copy_expand(skb, 8, 0, flags);
                dev_kfree_skb_any(skb);
                skb = skb2;
                if (!skb)
                        return NULL;
        }

        skb_push(skb, 4);
        cpu_to_le32s(&tx_hdr2);
        skb_copy_to_linear_data(skb, &tx_hdr2, 4);

        skb_push(skb, 4);
        cpu_to_le32s(&tx_hdr1);
        skb_copy_to_linear_data(skb, &tx_hdr1, 4);

        return skb;
}

static int ax88179_link_reset(struct usbnet *dev)
{
        struct ax88179_data *ax179_data = (struct ax88179_data *)dev->data;
        u8 tmp[5], link_sts;
        u16 mode, tmp16, delay = HZ / 10;
        u32 tmp32 = 0x40000000;
        unsigned long jtimeout;

        jtimeout = jiffies + delay;
        while (tmp32 & 0x40000000) {
                mode = 0;
                ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_CTL, 2, 2, &mode);
                ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_CTL, 2, 2,
                                  &ax179_data->rxctl);

                /*link up, check the usb device control TX FIFO full or empty*/
                ax88179_read_cmd(dev, 0x81, 0x8c, 0, 4, &tmp32);

                if (time_after(jiffies, jtimeout))
                        return 0;
        }

        mode = AX_MEDIUM_RECEIVE_EN | AX_MEDIUM_TXFLOW_CTRLEN |
               AX_MEDIUM_RXFLOW_CTRLEN | AX_MEDIUM_ALWAYS_ONE;

        ax88179_read_cmd(dev, AX_ACCESS_MAC, PHYSICAL_LINK_STATUS,
                         1, 1, &link_sts);

        ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
                         GMII_PHY_PHYSR, 2, &tmp16);

        if (!(tmp16 & GMII_PHY_PHYSR_LINK)) {
                return 0;
        } else if (GMII_PHY_PHYSR_GIGA == (tmp16 & GMII_PHY_PHYSR_SMASK)) {
                mode |= AX_MEDIUM_GIGAMODE | AX_MEDIUM_EN_125MHZ;
                if (dev->net->mtu > 1500)
                        mode |= AX_MEDIUM_JUMBO_EN;

                if (link_sts & AX_USB_SS)
                        memcpy(tmp, &AX88179_BULKIN_SIZE[0], 5);
                else if (link_sts & AX_USB_HS)
                        memcpy(tmp, &AX88179_BULKIN_SIZE[1], 5);
                else
                        memcpy(tmp, &AX88179_BULKIN_SIZE[3], 5);
        } else if (GMII_PHY_PHYSR_100 == (tmp16 & GMII_PHY_PHYSR_SMASK)) {
                mode |= AX_MEDIUM_PS;

                if (link_sts & (AX_USB_SS | AX_USB_HS))
                        memcpy(tmp, &AX88179_BULKIN_SIZE[2], 5);
                else
                        memcpy(tmp, &AX88179_BULKIN_SIZE[3], 5);
        } else {
                memcpy(tmp, &AX88179_BULKIN_SIZE[3], 5);
        }

        /* RX bulk configuration */
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_BULKIN_QCTRL, 5, 5, tmp);

        dev->rx_urb_size = (1024 * (tmp[3] + 2));

        if (tmp16 & GMII_PHY_PHYSR_FULL)
                mode |= AX_MEDIUM_FULL_DUPLEX;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                          2, 2, &mode);

        netif_carrier_on(dev->net);

        return 0;
}

static int ax88179_reset(struct usbnet *dev)
{
        u8 buf[5];
        u16 *tmp16;
        u8 *tmp;

        tmp16 = (u16 *)buf;
        tmp = (u8 *)buf;

        /* Power up ethernet PHY */
        *tmp16 = 0;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, tmp16);

        *tmp16 = AX_PHYPWR_RSTCTL_IPRL;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, tmp16);
        msleep(200);

        *tmp = AX_CLK_SELECT_ACS | AX_CLK_SELECT_BCS;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, tmp);
        msleep(100);

        /* Ethernet PHY Auto Detach*/
        ax88179_auto_detach(dev, 0);

        ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_NODE_ID, ETH_ALEN, ETH_ALEN,
                         dev->net->dev_addr);
        memcpy(dev->net->perm_addr, dev->net->dev_addr, ETH_ALEN);

        /* RX bulk configuration */
        memcpy(tmp, &AX88179_BULKIN_SIZE[0], 5);
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_BULKIN_QCTRL, 5, 5, tmp);

        dev->rx_urb_size = 1024 * 20;

        *tmp = 0x34;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PAUSE_WATERLVL_LOW, 1, 1, tmp);

        *tmp = 0x52;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PAUSE_WATERLVL_HIGH,
                          1, 1, tmp);

        dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                              NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO;

        dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                                 NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO;

        /* Enable checksum offload */
        *tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
               AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL, 1, 1, tmp);

        *tmp = AX_TXCOE_IP | AX_TXCOE_TCP | AX_TXCOE_UDP |
               AX_TXCOE_TCPV6 | AX_TXCOE_UDPV6;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, tmp);

        /* Configure RX control register => start operation */
        *tmp16 = AX_RX_CTL_DROPCRCERR | AX_RX_CTL_IPE | AX_RX_CTL_START |
                 AX_RX_CTL_AP | AX_RX_CTL_AMALL | AX_RX_CTL_AB;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RX_CTL, 2, 2, tmp16);

        *tmp = AX_MONITOR_MODE_PMETYPE | AX_MONITOR_MODE_PMEPOL |
               AX_MONITOR_MODE_RWMP;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD, 1, 1, tmp);

        /* Configure default medium type => giga */
        *tmp16 = AX_MEDIUM_RECEIVE_EN | AX_MEDIUM_TXFLOW_CTRLEN |
                 AX_MEDIUM_RXFLOW_CTRLEN | AX_MEDIUM_ALWAYS_ONE |
                 AX_MEDIUM_FULL_DUPLEX | AX_MEDIUM_GIGAMODE;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                          2, 2, tmp16);

        ax88179_led_setting(dev);

        /* Restart autoneg */
        mii_nway_restart(&dev->mii);

        usbnet_link_change(dev, 0, 0);

        return 0;
}

static int ax88179_stop(struct usbnet *dev)
{
        u16 tmp16;

        ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                         2, 2, &tmp16);
        tmp16 &= ~AX_MEDIUM_RECEIVE_EN;
        ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
                          2, 2, &tmp16);

        return 0;
}

static const struct driver_info ax88179_info = {
        .description = "ASIX AX88179 USB 3.0 Gigibit Ethernet",
        .bind = ax88179_bind,
        .unbind = ax88179_unbind,
        .status = ax88179_status,
        .link_reset = ax88179_link_reset,
        .reset = ax88179_reset,
        .stop = ax88179_stop,
        .flags = FLAG_ETHER | FLAG_FRAMING_AX,
        .rx_fixup = ax88179_rx_fixup,
        .tx_fixup = ax88179_tx_fixup,
};

static const struct driver_info ax88178a_info = {
        .description = "ASIX AX88178A USB 2.0 Gigibit Ethernet",
        .bind = ax88179_bind,
        .unbind = ax88179_unbind,
        .status = ax88179_status,
        .link_reset = ax88179_link_reset,
        .reset = ax88179_reset,
        .stop = ax88179_stop,
        .flags = FLAG_ETHER | FLAG_FRAMING_AX,
        .rx_fixup = ax88179_rx_fixup,
        .tx_fixup = ax88179_tx_fixup,
};

static const struct driver_info sitecom_info = {
        .description = "Sitecom USB 3.0 to Gigabit Adapter",
        .bind = ax88179_bind,
        .unbind = ax88179_unbind,
        .status = ax88179_status,
        .link_reset = ax88179_link_reset,
        .reset = ax88179_reset,
        .stop = ax88179_stop,
        .flags = FLAG_ETHER | FLAG_FRAMING_AX,
        .rx_fixup = ax88179_rx_fixup,
        .tx_fixup = ax88179_tx_fixup,
};

static const struct usb_device_id products[] = {
{
        /* ASIX AX88179 10/100/1000 */
        USB_DEVICE(0x0b95, 0x1790),
        .driver_info = (unsigned long)&ax88179_info,
}, {
        /* ASIX AX88178A 10/100/1000 */
        USB_DEVICE(0x0b95, 0x178a),
        .driver_info = (unsigned long)&ax88178a_info,
}, {
        /* Sitecom USB 3.0 to Gigabit Adapter */
        USB_DEVICE(0x0df6, 0x0072),
        .driver_info = (unsigned long) &sitecom_info,
},
        { },
};
MODULE_DEVICE_TABLE(usb, products);

static struct usb_driver ax88179_178a_driver = {
        .name =         "ax88179_178a",
        .id_table =     products,
        .probe =        usbnet_probe,
        .suspend =      ax88179_suspend,
        .resume =       ax88179_resume,
        .disconnect =   usbnet_disconnect,
        .supports_autosuspend = 1,
        .disable_hub_initiated_lpm = 1,
};

module_usb_driver(ax88179_178a_driver);

MODULE_DESCRIPTION("ASIX AX88179/178A based USB 3.0/2.0 Gigabit Ethernet Devices");
MODULE_LICENSE("GPL");