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

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

#include "sr9800.h"

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

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

        return err;
}

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

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

        return err;
}

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

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

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

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

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

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

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

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

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

        return 1;
}

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

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

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

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

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

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

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

        if (urb->actual_length < 8)
                return;

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

        return;
}

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

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

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

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

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

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

        ret = buf[1];

out:
        return ret;
}

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

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

        return ret;
}

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

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

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

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

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

        return ret;
}

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

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

        return le16_to_cpu(v);
}

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

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

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

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

        return ret;
}

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

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

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

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

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

                rx_ctl |= SR_RX_CTL_AM;
        }

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

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

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

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

        return le16_to_cpu(res);
}

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

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

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

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

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

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

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

        phy_id |= (phy_reg & 0xffff);

        return phy_id;
}

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

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

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

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

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

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

        return 0;
}

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

        return data->eeprom_len;
}

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

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

        eeprom->magic = SR_EEPROM_MAGIC;

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

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

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

        eth_hw_addr_set(net, addr->sa_data);

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

        return 0;
}

static const struct ethtool_ops sr9800_ethtool_ops = {
        .get_drvinfo    = usbnet_get_drvinfo,
        .get_link       = usbnet_get_link,
        .get_msglevel   = usbnet_get_msglevel,
        .set_msglevel   = usbnet_set_msglevel,
        .get_wol        = sr_get_wol,
        .set_wol        = sr_set_wol,
        .get_eeprom_len = sr_get_eeprom_len,
        .get_eeprom     = sr_get_eeprom,
        .nway_reset     = usbnet_nway_reset,
        .get_link_ksettings     = usbnet_get_link_ksettings_mii,
        .set_link_ksettings     = usbnet_set_link_ksettings_mii,
};

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

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

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

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

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

        sr_write_medium_mode(dev, mode);

        return 0;
}


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

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

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

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

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

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

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

        return 0;
out:
        return ret;
}

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

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

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

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

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

        msleep(150);

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

        msleep(150);

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

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

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

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

        msleep(150);

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

        msleep(150);

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

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

        return 0;

out:
        return ret;
}

static const struct net_device_ops sr9800_netdev_ops = {
        .ndo_open               = usbnet_open,
        .ndo_stop               = usbnet_stop,
        .ndo_start_xmit         = usbnet_start_xmit,
        .ndo_tx_timeout         = usbnet_tx_timeout,
        .ndo_change_mtu         = usbnet_change_mtu,
        .ndo_get_stats64        = dev_get_tstats64,
        .ndo_set_mac_address    = sr_set_mac_address,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_eth_ioctl          = usbnet_mii_ioctl,
        .ndo_set_rx_mode        = sr_set_multicast,
};

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

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

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

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

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

        return 0;
}

static int sr9800_bind(struct usbnet *dev, struct usb_interface *intf)
{
        struct sr_data *data = (struct sr_data *)&dev->data;
        u16 led01_mux, led23_mux;
        int ret, embd_phy;
        u8 addr[ETH_ALEN];
        u32 phyid;
        u16 rx_ctl;

        data->eeprom_len = SR9800_EEPROM_LEN;

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

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

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

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

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

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

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

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

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

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

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

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

out:
        return ret;
}

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

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

MODULE_DEVICE_TABLE(usb, products);

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

module_usb_driver(sr_driver);

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