/*
 * Copyright(c) 2008 - 2009 Atheros Corporation. All rights reserved.
 *
 * Derived from Intel e1000 driver
 * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
 *
 * 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 "atl1c.h"

#define ATL1C_DRV_VERSION "1.0.1.0-NAPI"
char atl1c_driver_name[] = "atl1c";
char atl1c_driver_version[] = ATL1C_DRV_VERSION;
#define PCI_DEVICE_ID_ATTANSIC_L2C      0x1062
#define PCI_DEVICE_ID_ATTANSIC_L1C      0x1063
#define PCI_DEVICE_ID_ATHEROS_L2C_B     0x2060 /* AR8152 v1.1 Fast 10/100 */
#define PCI_DEVICE_ID_ATHEROS_L2C_B2    0x2062 /* AR8152 v2.0 Fast 10/100 */
#define PCI_DEVICE_ID_ATHEROS_L1D       0x1073 /* AR8151 v1.0 Gigabit 1000 */
#define PCI_DEVICE_ID_ATHEROS_L1D_2_0   0x1083 /* AR8151 v2.0 Gigabit 1000 */
#define L2CB_V10                        0xc0
#define L2CB_V11                        0xc1

/*
 * atl1c_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static DEFINE_PCI_DEVICE_TABLE(atl1c_pci_tbl) = {
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1C)},
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L2C)},
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B)},
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B2)},
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D)},
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D_2_0)},
        /* required last entry */
        { 0 }
};
MODULE_DEVICE_TABLE(pci, atl1c_pci_tbl);

MODULE_AUTHOR("Jie Yang <jie.yang@atheros.com>");
MODULE_DESCRIPTION("Atheros 1000M Ethernet Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(ATL1C_DRV_VERSION);

static int atl1c_stop_mac(struct atl1c_hw *hw);
static void atl1c_enable_rx_ctrl(struct atl1c_hw *hw);
static void atl1c_enable_tx_ctrl(struct atl1c_hw *hw);
static void atl1c_disable_l0s_l1(struct atl1c_hw *hw);
static void atl1c_set_aspm(struct atl1c_hw *hw, bool linkup);
static void atl1c_setup_mac_ctrl(struct atl1c_adapter *adapter);
static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter, u8 que,
                   int *work_done, int work_to_do);
static int atl1c_up(struct atl1c_adapter *adapter);
static void atl1c_down(struct atl1c_adapter *adapter);

static const u16 atl1c_pay_load_size[] = {
        128, 256, 512, 1024, 2048, 4096,
};

static const u16 atl1c_rfd_prod_idx_regs[AT_MAX_RECEIVE_QUEUE] =
{
        REG_MB_RFD0_PROD_IDX,
        REG_MB_RFD1_PROD_IDX,
        REG_MB_RFD2_PROD_IDX,
        REG_MB_RFD3_PROD_IDX
};

static const u16 atl1c_rfd_addr_lo_regs[AT_MAX_RECEIVE_QUEUE] =
{
        REG_RFD0_HEAD_ADDR_LO,
        REG_RFD1_HEAD_ADDR_LO,
        REG_RFD2_HEAD_ADDR_LO,
        REG_RFD3_HEAD_ADDR_LO
};

static const u16 atl1c_rrd_addr_lo_regs[AT_MAX_RECEIVE_QUEUE] =
{
        REG_RRD0_HEAD_ADDR_LO,
        REG_RRD1_HEAD_ADDR_LO,
        REG_RRD2_HEAD_ADDR_LO,
        REG_RRD3_HEAD_ADDR_LO
};

static const u32 atl1c_default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
        NETIF_MSG_LINK | NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP;
static void atl1c_pcie_patch(struct atl1c_hw *hw)
{
        u32 data;

        AT_READ_REG(hw, REG_PCIE_PHYMISC, &data);
        data |= PCIE_PHYMISC_FORCE_RCV_DET;
        AT_WRITE_REG(hw, REG_PCIE_PHYMISC, data);

        if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10) {
                AT_READ_REG(hw, REG_PCIE_PHYMISC2, &data);

                data &= ~(PCIE_PHYMISC2_SERDES_CDR_MASK <<
                        PCIE_PHYMISC2_SERDES_CDR_SHIFT);
                data |= 3 << PCIE_PHYMISC2_SERDES_CDR_SHIFT;
                data &= ~(PCIE_PHYMISC2_SERDES_TH_MASK <<
                        PCIE_PHYMISC2_SERDES_TH_SHIFT);
                data |= 3 << PCIE_PHYMISC2_SERDES_TH_SHIFT;
                AT_WRITE_REG(hw, REG_PCIE_PHYMISC2, data);
        }
}

/* FIXME: no need any more ? */
/*
 * atl1c_init_pcie - init PCIE module
 */
static void atl1c_reset_pcie(struct atl1c_hw *hw, u32 flag)
{
        u32 data;
        u32 pci_cmd;
        struct pci_dev *pdev = hw->adapter->pdev;

        AT_READ_REG(hw, PCI_COMMAND, &pci_cmd);
        pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
        pci_cmd |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
                PCI_COMMAND_IO);
        AT_WRITE_REG(hw, PCI_COMMAND, pci_cmd);

        /*
         * Clear any PowerSaveing Settings
         */
        pci_enable_wake(pdev, PCI_D3hot, 0);
        pci_enable_wake(pdev, PCI_D3cold, 0);

        /*
         * Mask some pcie error bits
         */
        AT_READ_REG(hw, REG_PCIE_UC_SEVERITY, &data);
        data &= ~PCIE_UC_SERVRITY_DLP;
        data &= ~PCIE_UC_SERVRITY_FCP;
        AT_WRITE_REG(hw, REG_PCIE_UC_SEVERITY, data);

        AT_READ_REG(hw, REG_LTSSM_ID_CTRL, &data);
        data &= ~LTSSM_ID_EN_WRO;
        AT_WRITE_REG(hw, REG_LTSSM_ID_CTRL, data);

        atl1c_pcie_patch(hw);
        if (flag & ATL1C_PCIE_L0S_L1_DISABLE)
                atl1c_disable_l0s_l1(hw);
        if (flag & ATL1C_PCIE_PHY_RESET)
                AT_WRITE_REG(hw, REG_GPHY_CTRL, GPHY_CTRL_DEFAULT);
        else
                AT_WRITE_REG(hw, REG_GPHY_CTRL,
                        GPHY_CTRL_DEFAULT | GPHY_CTRL_EXT_RESET);

        msleep(5);
}

/*
 * atl1c_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 */
static inline void atl1c_irq_enable(struct atl1c_adapter *adapter)
{
        if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
                AT_WRITE_REG(&adapter->hw, REG_ISR, 0x7FFFFFFF);
                AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
                AT_WRITE_FLUSH(&adapter->hw);
        }
}

/*
 * atl1c_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 */
static inline void atl1c_irq_disable(struct atl1c_adapter *adapter)
{
        atomic_inc(&adapter->irq_sem);
        AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
        AT_WRITE_REG(&adapter->hw, REG_ISR, ISR_DIS_INT);
        AT_WRITE_FLUSH(&adapter->hw);
        synchronize_irq(adapter->pdev->irq);
}

/*
 * atl1c_irq_reset - reset interrupt confiure on the NIC
 * @adapter: board private structure
 */
static inline void atl1c_irq_reset(struct atl1c_adapter *adapter)
{
        atomic_set(&adapter->irq_sem, 1);
        atl1c_irq_enable(adapter);
}

/*
 * atl1c_wait_until_idle - wait up to AT_HW_MAX_IDLE_DELAY reads
 * of the idle status register until the device is actually idle
 */
static u32 atl1c_wait_until_idle(struct atl1c_hw *hw)
{
        int timeout;
        u32 data;

        for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
                AT_READ_REG(hw, REG_IDLE_STATUS, &data);
                if ((data & IDLE_STATUS_MASK) == 0)
                        return 0;
                msleep(1);
        }
        return data;
}

/*
 * atl1c_phy_config - Timer Call-back
 * @data: pointer to netdev cast into an unsigned long
 */
static void atl1c_phy_config(unsigned long data)
{
        struct atl1c_adapter *adapter = (struct atl1c_adapter *) data;
        struct atl1c_hw *hw = &adapter->hw;
        unsigned long flags;

        spin_lock_irqsave(&adapter->mdio_lock, flags);
        atl1c_restart_autoneg(hw);
        spin_unlock_irqrestore(&adapter->mdio_lock, flags);
}

void atl1c_reinit_locked(struct atl1c_adapter *adapter)
{
        WARN_ON(in_interrupt());
        atl1c_down(adapter);
        atl1c_up(adapter);
        clear_bit(__AT_RESETTING, &adapter->flags);
}

static void atl1c_check_link_status(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev    *pdev   = adapter->pdev;
        int err;
        unsigned long flags;
        u16 speed, duplex, phy_data;

        spin_lock_irqsave(&adapter->mdio_lock, flags);
        /* MII_BMSR must read twise */
        atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
        atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
        spin_unlock_irqrestore(&adapter->mdio_lock, flags);

        if ((phy_data & BMSR_LSTATUS) == 0) {
                /* link down */
                hw->hibernate = true;
                if (atl1c_stop_mac(hw) != 0)
                        if (netif_msg_hw(adapter))
                                dev_warn(&pdev->dev, "stop mac failed\n");
                atl1c_set_aspm(hw, false);
                netif_carrier_off(netdev);
                netif_stop_queue(netdev);
                atl1c_phy_reset(hw);
                atl1c_phy_init(&adapter->hw);
        } else {
                /* Link Up */
                hw->hibernate = false;
                spin_lock_irqsave(&adapter->mdio_lock, flags);
                err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
                spin_unlock_irqrestore(&adapter->mdio_lock, flags);
                if (unlikely(err))
                        return;
                /* link result is our setting */
                if (adapter->link_speed != speed ||
                    adapter->link_duplex != duplex) {
                        adapter->link_speed  = speed;
                        adapter->link_duplex = duplex;
                        atl1c_set_aspm(hw, true);
                        atl1c_enable_tx_ctrl(hw);
                        atl1c_enable_rx_ctrl(hw);
                        atl1c_setup_mac_ctrl(adapter);
                        if (netif_msg_link(adapter))
                                dev_info(&pdev->dev,
                                        "%s: %s NIC Link is Up<%d Mbps %s>\n",
                                        atl1c_driver_name, netdev->name,
                                        adapter->link_speed,
                                        adapter->link_duplex == FULL_DUPLEX ?
                                        "Full Duplex" : "Half Duplex");
                }
                if (!netif_carrier_ok(netdev))
                        netif_carrier_on(netdev);
        }
}

static void atl1c_link_chg_event(struct atl1c_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct pci_dev    *pdev   = adapter->pdev;
        u16 phy_data;
        u16 link_up;

        spin_lock(&adapter->mdio_lock);
        atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
        atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
        spin_unlock(&adapter->mdio_lock);
        link_up = phy_data & BMSR_LSTATUS;
        /* notify upper layer link down ASAP */
        if (!link_up) {
                if (netif_carrier_ok(netdev)) {
                        /* old link state: Up */
                        netif_carrier_off(netdev);
                        if (netif_msg_link(adapter))
                                dev_info(&pdev->dev,
                                        "%s: %s NIC Link is Down\n",
                                        atl1c_driver_name, netdev->name);
                        adapter->link_speed = SPEED_0;
                }
        }

        set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event);
        schedule_work(&adapter->common_task);
}

static void atl1c_common_task(struct work_struct *work)
{
        struct atl1c_adapter *adapter;
        struct net_device *netdev;

        adapter = container_of(work, struct atl1c_adapter, common_task);
        netdev = adapter->netdev;

        if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) {
                netif_device_detach(netdev);
                atl1c_down(adapter);
                atl1c_up(adapter);
                netif_device_attach(netdev);
        }

        if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE,
                &adapter->work_event))
                atl1c_check_link_status(adapter);
}


static void atl1c_del_timer(struct atl1c_adapter *adapter)
{
        del_timer_sync(&adapter->phy_config_timer);
}


/*
 * atl1c_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 */
static void atl1c_tx_timeout(struct net_device *netdev)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        /* Do the reset outside of interrupt context */
        set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
        schedule_work(&adapter->common_task);
}

/*
 * atl1c_set_multi - Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The set_multi entry point is called whenever the multicast address
 * list or the network interface flags are updated.  This routine is
 * responsible for configuring the hardware for proper multicast,
 * promiscuous mode, and all-multi behavior.
 */
static void atl1c_set_multi(struct net_device *netdev)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        struct atl1c_hw *hw = &adapter->hw;
        struct netdev_hw_addr *ha;
        u32 mac_ctrl_data;
        u32 hash_value;

        /* Check for Promiscuous and All Multicast modes */
        AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);

        if (netdev->flags & IFF_PROMISC) {
                mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
        } else if (netdev->flags & IFF_ALLMULTI) {
                mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;
                mac_ctrl_data &= ~MAC_CTRL_PROMIS_EN;
        } else {
                mac_ctrl_data &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);
        }

        AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);

        /* clear the old settings from the multicast hash table */
        AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
        AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);

        /* comoute mc addresses' hash value ,and put it into hash table */
        netdev_for_each_mc_addr(ha, netdev) {
                hash_value = atl1c_hash_mc_addr(hw, ha->addr);
                atl1c_hash_set(hw, hash_value);
        }
}

static void __atl1c_vlan_mode(netdev_features_t features, u32 *mac_ctrl_data)
{
        if (features & NETIF_F_HW_VLAN_RX) {
                /* enable VLAN tag insert/strip */
                *mac_ctrl_data |= MAC_CTRL_RMV_VLAN;
        } else {
                /* disable VLAN tag insert/strip */
                *mac_ctrl_data &= ~MAC_CTRL_RMV_VLAN;
        }
}

static void atl1c_vlan_mode(struct net_device *netdev,
        netdev_features_t features)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        struct pci_dev *pdev = adapter->pdev;
        u32 mac_ctrl_data = 0;

        if (netif_msg_pktdata(adapter))
                dev_dbg(&pdev->dev, "atl1c_vlan_mode\n");

        atl1c_irq_disable(adapter);
        AT_READ_REG(&adapter->hw, REG_MAC_CTRL, &mac_ctrl_data);
        __atl1c_vlan_mode(features, &mac_ctrl_data);
        AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
        atl1c_irq_enable(adapter);
}

static void atl1c_restore_vlan(struct atl1c_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;

        if (netif_msg_pktdata(adapter))
                dev_dbg(&pdev->dev, "atl1c_restore_vlan\n");
        atl1c_vlan_mode(adapter->netdev, adapter->netdev->features);
}

/*
 * atl1c_set_mac - Change the Ethernet Address of the NIC
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 */
static int atl1c_set_mac_addr(struct net_device *netdev, void *p)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        struct sockaddr *addr = p;

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

        if (netif_running(netdev))
                return -EBUSY;

        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
        memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
        netdev->addr_assign_type &= ~NET_ADDR_RANDOM;

        atl1c_hw_set_mac_addr(&adapter->hw);

        return 0;
}

static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
                                struct net_device *dev)
{
        int mtu = dev->mtu;

        adapter->rx_buffer_len = mtu > AT_RX_BUF_SIZE ?
                roundup(mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN, 8) : AT_RX_BUF_SIZE;
}

static netdev_features_t atl1c_fix_features(struct net_device *netdev,
        netdev_features_t features)
{
        /*
         * Since there is no support for separate rx/tx vlan accel
         * enable/disable make sure tx flag is always in same state as rx.
         */
        if (features & NETIF_F_HW_VLAN_RX)
                features |= NETIF_F_HW_VLAN_TX;
        else
                features &= ~NETIF_F_HW_VLAN_TX;

        if (netdev->mtu > MAX_TSO_FRAME_SIZE)
                features &= ~(NETIF_F_TSO | NETIF_F_TSO6);

        return features;
}

static int atl1c_set_features(struct net_device *netdev,
        netdev_features_t features)
{
        netdev_features_t changed = netdev->features ^ features;

        if (changed & NETIF_F_HW_VLAN_RX)
                atl1c_vlan_mode(netdev, features);

        return 0;
}

/*
 * atl1c_change_mtu - Change the Maximum Transfer Unit
 * @netdev: network interface device structure
 * @new_mtu: new value for maximum frame size
 *
 * Returns 0 on success, negative on failure
 */
static int atl1c_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        int old_mtu   = netdev->mtu;
        int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;

        if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||
                        (max_frame > MAX_JUMBO_FRAME_SIZE)) {
                if (netif_msg_link(adapter))
                        dev_warn(&adapter->pdev->dev, "invalid MTU setting\n");
                return -EINVAL;
        }
        /* set MTU */
        if (old_mtu != new_mtu && netif_running(netdev)) {
                while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
                        msleep(1);
                netdev->mtu = new_mtu;
                adapter->hw.max_frame_size = new_mtu;
                atl1c_set_rxbufsize(adapter, netdev);
                atl1c_down(adapter);
                netdev_update_features(netdev);
                atl1c_up(adapter);
                clear_bit(__AT_RESETTING, &adapter->flags);
                if (adapter->hw.ctrl_flags & ATL1C_FPGA_VERSION) {
                        u32 phy_data;

                        AT_READ_REG(&adapter->hw, 0x1414, &phy_data);
                        phy_data |= 0x10000000;
                        AT_WRITE_REG(&adapter->hw, 0x1414, phy_data);
                }

        }
        return 0;
}

/*
 *  caller should hold mdio_lock
 */
static int atl1c_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        u16 result;

        atl1c_read_phy_reg(&adapter->hw, reg_num & MDIO_REG_ADDR_MASK, &result);
        return result;
}

static void atl1c_mdio_write(struct net_device *netdev, int phy_id,
                             int reg_num, int val)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        atl1c_write_phy_reg(&adapter->hw, reg_num & MDIO_REG_ADDR_MASK, val);
}

/*
 * atl1c_mii_ioctl -
 * @netdev:
 * @ifreq:
 * @cmd:
 */
static int atl1c_mii_ioctl(struct net_device *netdev,
                           struct ifreq *ifr, int cmd)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        struct pci_dev *pdev = adapter->pdev;
        struct mii_ioctl_data *data = if_mii(ifr);
        unsigned long flags;
        int retval = 0;

        if (!netif_running(netdev))
                return -EINVAL;

        spin_lock_irqsave(&adapter->mdio_lock, flags);
        switch (cmd) {
        case SIOCGMIIPHY:
                data->phy_id = 0;
                break;

        case SIOCGMIIREG:
                if (atl1c_read_phy_reg(&adapter->hw, data->reg_num & 0x1F,
                                    &data->val_out)) {
                        retval = -EIO;
                        goto out;
                }
                break;

        case SIOCSMIIREG:
                if (data->reg_num & ~(0x1F)) {
                        retval = -EFAULT;
                        goto out;
                }

                dev_dbg(&pdev->dev, "<atl1c_mii_ioctl> write %x %x",
                                data->reg_num, data->val_in);
                if (atl1c_write_phy_reg(&adapter->hw,
                                     data->reg_num, data->val_in)) {
                        retval = -EIO;
                        goto out;
                }
                break;

        default:
                retval = -EOPNOTSUPP;
                break;
        }
out:
        spin_unlock_irqrestore(&adapter->mdio_lock, flags);
        return retval;
}

/*
 * atl1c_ioctl -
 * @netdev:
 * @ifreq:
 * @cmd:
 */
static int atl1c_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        switch (cmd) {
        case SIOCGMIIPHY:
        case SIOCGMIIREG:
        case SIOCSMIIREG:
                return atl1c_mii_ioctl(netdev, ifr, cmd);
        default:
                return -EOPNOTSUPP;
        }
}

/*
 * atl1c_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 */
static int __devinit atl1c_alloc_queues(struct atl1c_adapter *adapter)
{
        return 0;
}

static void atl1c_set_mac_type(struct atl1c_hw *hw)
{
        switch (hw->device_id) {
        case PCI_DEVICE_ID_ATTANSIC_L2C:
                hw->nic_type = athr_l2c;
                break;
        case PCI_DEVICE_ID_ATTANSIC_L1C:
                hw->nic_type = athr_l1c;
                break;
        case PCI_DEVICE_ID_ATHEROS_L2C_B:
                hw->nic_type = athr_l2c_b;
                break;
        case PCI_DEVICE_ID_ATHEROS_L2C_B2:
                hw->nic_type = athr_l2c_b2;
                break;
        case PCI_DEVICE_ID_ATHEROS_L1D:
                hw->nic_type = athr_l1d;
                break;
        case PCI_DEVICE_ID_ATHEROS_L1D_2_0:
                hw->nic_type = athr_l1d_2;
                break;
        default:
                break;
        }
}

static int atl1c_setup_mac_funcs(struct atl1c_hw *hw)
{
        u32 phy_status_data;
        u32 link_ctrl_data;

        atl1c_set_mac_type(hw);
        AT_READ_REG(hw, REG_PHY_STATUS, &phy_status_data);
        AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);

        hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
                         ATL1C_TXQ_MODE_ENHANCE;
        if (link_ctrl_data & LINK_CTRL_L0S_EN)
                hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT;
        if (link_ctrl_data & LINK_CTRL_L1_EN)
                hw->ctrl_flags |= ATL1C_ASPM_L1_SUPPORT;
        if (link_ctrl_data & LINK_CTRL_EXT_SYNC)
                hw->ctrl_flags |= ATL1C_LINK_EXT_SYNC;
        hw->ctrl_flags |= ATL1C_ASPM_CTRL_MON;

        if (hw->nic_type == athr_l1c ||
            hw->nic_type == athr_l1d ||
            hw->nic_type == athr_l1d_2)
                hw->link_cap_flags |= ATL1C_LINK_CAP_1000M;
        return 0;
}
/*
 * atl1c_sw_init - Initialize general software structures (struct atl1c_adapter)
 * @adapter: board private structure to initialize
 *
 * atl1c_sw_init initializes the Adapter private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 */
static int __devinit atl1c_sw_init(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw   = &adapter->hw;
        struct pci_dev  *pdev = adapter->pdev;
        u32 revision;


        adapter->wol = 0;
        device_set_wakeup_enable(&pdev->dev, false);
        adapter->link_speed = SPEED_0;
        adapter->link_duplex = FULL_DUPLEX;
        adapter->num_rx_queues = AT_DEF_RECEIVE_QUEUE;
        adapter->tpd_ring[0].count = 1024;
        adapter->rfd_ring[0].count = 512;

        hw->vendor_id = pdev->vendor;
        hw->device_id = pdev->device;
        hw->subsystem_vendor_id = pdev->subsystem_vendor;
        hw->subsystem_id = pdev->subsystem_device;
        AT_READ_REG(hw, PCI_CLASS_REVISION, &revision);
        hw->revision_id = revision & 0xFF;
        /* before link up, we assume hibernate is true */
        hw->hibernate = true;
        hw->media_type = MEDIA_TYPE_AUTO_SENSOR;
        if (atl1c_setup_mac_funcs(hw) != 0) {
                dev_err(&pdev->dev, "set mac function pointers failed\n");
                return -1;
        }
        hw->intr_mask = IMR_NORMAL_MASK;
        hw->phy_configured = false;
        hw->preamble_len = 7;
        hw->max_frame_size = adapter->netdev->mtu;
        if (adapter->num_rx_queues < 2) {
                hw->rss_type = atl1c_rss_disable;
                hw->rss_mode = atl1c_rss_mode_disable;
        } else {
                hw->rss_type = atl1c_rss_ipv4;
                hw->rss_mode = atl1c_rss_mul_que_mul_int;
                hw->rss_hash_bits = 16;
        }
        hw->autoneg_advertised = ADVERTISED_Autoneg;
        hw->indirect_tab = 0xE4E4E4E4;
        hw->base_cpu = 0;

        hw->ict = 50000;                /* 100ms */
        hw->smb_timer = 200000;         /* 400ms */
        hw->cmb_tpd = 4;
        hw->cmb_tx_timer = 1;           /* 2 us  */
        hw->rx_imt = 200;
        hw->tx_imt = 1000;

        hw->tpd_burst = 5;
        hw->rfd_burst = 8;
        hw->dma_order = atl1c_dma_ord_out;
        hw->dmar_block = atl1c_dma_req_1024;
        hw->dmaw_block = atl1c_dma_req_1024;
        hw->dmar_dly_cnt = 15;
        hw->dmaw_dly_cnt = 4;

        if (atl1c_alloc_queues(adapter)) {
                dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
                return -ENOMEM;
        }
        /* TODO */
        atl1c_set_rxbufsize(adapter, adapter->netdev);
        atomic_set(&adapter->irq_sem, 1);
        spin_lock_init(&adapter->mdio_lock);
        spin_lock_init(&adapter->tx_lock);
        set_bit(__AT_DOWN, &adapter->flags);

        return 0;
}

static inline void atl1c_clean_buffer(struct pci_dev *pdev,
                                struct atl1c_buffer *buffer_info, int in_irq)
{
        u16 pci_driection;
        if (buffer_info->flags & ATL1C_BUFFER_FREE)
                return;
        if (buffer_info->dma) {
                if (buffer_info->flags & ATL1C_PCIMAP_FROMDEVICE)
                        pci_driection = PCI_DMA_FROMDEVICE;
                else
                        pci_driection = PCI_DMA_TODEVICE;

                if (buffer_info->flags & ATL1C_PCIMAP_SINGLE)
                        pci_unmap_single(pdev, buffer_info->dma,
                                        buffer_info->length, pci_driection);
                else if (buffer_info->flags & ATL1C_PCIMAP_PAGE)
                        pci_unmap_page(pdev, buffer_info->dma,
                                        buffer_info->length, pci_driection);
        }
        if (buffer_info->skb) {
                if (in_irq)
                        dev_kfree_skb_irq(buffer_info->skb);
                else
                        dev_kfree_skb(buffer_info->skb);
        }
        buffer_info->dma = 0;
        buffer_info->skb = NULL;
        ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
}
/*
 * atl1c_clean_tx_ring - Free Tx-skb
 * @adapter: board private structure
 */
static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter,
                                enum atl1c_trans_queue type)
{
        struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
        struct atl1c_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        u16 index, ring_count;

        ring_count = tpd_ring->count;
        for (index = 0; index < ring_count; index++) {
                buffer_info = &tpd_ring->buffer_info[index];
                atl1c_clean_buffer(pdev, buffer_info, 0);
        }

        /* Zero out Tx-buffers */
        memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *
                ring_count);
        atomic_set(&tpd_ring->next_to_clean, 0);
        tpd_ring->next_to_use = 0;
}

/*
 * atl1c_clean_rx_ring - Free rx-reservation skbs
 * @adapter: board private structure
 */
static void atl1c_clean_rx_ring(struct atl1c_adapter *adapter)
{
        struct atl1c_rfd_ring *rfd_ring = adapter->rfd_ring;
        struct atl1c_rrd_ring *rrd_ring = adapter->rrd_ring;
        struct atl1c_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        int i, j;

        for (i = 0; i < adapter->num_rx_queues; i++) {
                for (j = 0; j < rfd_ring[i].count; j++) {
                        buffer_info = &rfd_ring[i].buffer_info[j];
                        atl1c_clean_buffer(pdev, buffer_info, 0);
                }
                /* zero out the descriptor ring */
                memset(rfd_ring[i].desc, 0, rfd_ring[i].size);
                rfd_ring[i].next_to_clean = 0;
                rfd_ring[i].next_to_use = 0;
                rrd_ring[i].next_to_use = 0;
                rrd_ring[i].next_to_clean = 0;
        }
}

/*
 * Read / Write Ptr Initialize:
 */
static void atl1c_init_ring_ptrs(struct atl1c_adapter *adapter)
{
        struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
        struct atl1c_rfd_ring *rfd_ring = adapter->rfd_ring;
        struct atl1c_rrd_ring *rrd_ring = adapter->rrd_ring;
        struct atl1c_buffer *buffer_info;
        int i, j;

        for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
                tpd_ring[i].next_to_use = 0;
                atomic_set(&tpd_ring[i].next_to_clean, 0);
                buffer_info = tpd_ring[i].buffer_info;
                for (j = 0; j < tpd_ring->count; j++)
                        ATL1C_SET_BUFFER_STATE(&buffer_info[i],
                                        ATL1C_BUFFER_FREE);
        }
        for (i = 0; i < adapter->num_rx_queues; i++) {
                rfd_ring[i].next_to_use = 0;
                rfd_ring[i].next_to_clean = 0;
                rrd_ring[i].next_to_use = 0;
                rrd_ring[i].next_to_clean = 0;
                for (j = 0; j < rfd_ring[i].count; j++) {
                        buffer_info = &rfd_ring[i].buffer_info[j];
                        ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
                }
        }
}

/*
 * atl1c_free_ring_resources - Free Tx / RX descriptor Resources
 * @adapter: board private structure
 *
 * Free all transmit software resources
 */
static void atl1c_free_ring_resources(struct atl1c_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;

        pci_free_consistent(pdev, adapter->ring_header.size,
                                        adapter->ring_header.desc,
                                        adapter->ring_header.dma);
        adapter->ring_header.desc = NULL;

        /* Note: just free tdp_ring.buffer_info,
        *  it contain rfd_ring.buffer_info, do not double free */
        if (adapter->tpd_ring[0].buffer_info) {
                kfree(adapter->tpd_ring[0].buffer_info);
                adapter->tpd_ring[0].buffer_info = NULL;
        }
}

/*
 * atl1c_setup_mem_resources - allocate Tx / RX descriptor resources
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 */
static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
        struct atl1c_rfd_ring *rfd_ring = adapter->rfd_ring;
        struct atl1c_rrd_ring *rrd_ring = adapter->rrd_ring;
        struct atl1c_ring_header *ring_header = &adapter->ring_header;
        int num_rx_queues = adapter->num_rx_queues;
        int size;
        int i;
        int count = 0;
        int rx_desc_count = 0;
        u32 offset = 0;

        rrd_ring[0].count = rfd_ring[0].count;
        for (i = 1; i < AT_MAX_TRANSMIT_QUEUE; i++)
                tpd_ring[i].count = tpd_ring[0].count;

        for (i = 1; i < adapter->num_rx_queues; i++)
                rfd_ring[i].count = rrd_ring[i].count = rfd_ring[0].count;

        /* 2 tpd queue, one high priority queue,
         * another normal priority queue */
        size = sizeof(struct atl1c_buffer) * (tpd_ring->count * 2 +
                rfd_ring->count * num_rx_queues);
        tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
        if (unlikely(!tpd_ring->buffer_info)) {
                dev_err(&pdev->dev, "kzalloc failed, size = %d\n",
                        size);
                goto err_nomem;
        }
        for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
                tpd_ring[i].buffer_info =
                        (struct atl1c_buffer *) (tpd_ring->buffer_info + count);
                count += tpd_ring[i].count;
        }

        for (i = 0; i < num_rx_queues; i++) {
                rfd_ring[i].buffer_info =
                        (struct atl1c_buffer *) (tpd_ring->buffer_info + count);
                count += rfd_ring[i].count;
                rx_desc_count += rfd_ring[i].count;
        }
        /*
         * real ring DMA buffer
         * each ring/block may need up to 8 bytes for alignment, hence the
         * additional bytes tacked onto the end.
         */
        ring_header->size = size =
                sizeof(struct atl1c_tpd_desc) * tpd_ring->count * 2 +
                sizeof(struct atl1c_rx_free_desc) * rx_desc_count +
                sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
                sizeof(struct atl1c_hw_stats) +
                8 * 4 + 8 * 2 * num_rx_queues;

        ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
                                &ring_header->dma);
        if (unlikely(!ring_header->desc)) {
                dev_err(&pdev->dev, "pci_alloc_consistend failed\n");
                goto err_nomem;
        }
        memset(ring_header->desc, 0, ring_header->size);
        /* init TPD ring */

        tpd_ring[0].dma = roundup(ring_header->dma, 8);
        offset = tpd_ring[0].dma - ring_header->dma;
        for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {

                tpd_ring[i].dma = ring_header->dma + offset;
                tpd_ring[i].desc = (u8 *) ring_header->desc + offset;
                tpd_ring[i].size =
                        sizeof(struct atl1c_tpd_desc) * tpd_ring[i].count;
                offset += roundup(tpd_ring[i].size, 8);
        }
        /* init RFD ring */
        for (i = 0; i < num_rx_queues; i++) {
                rfd_ring[i].dma = ring_header->dma + offset;
                rfd_ring[i].desc = (u8 *) ring_header->desc + offset;
                rfd_ring[i].size = sizeof(struct atl1c_rx_free_desc) *
                                rfd_ring[i].count;
                offset += roundup(rfd_ring[i].size, 8);
        }

        /* init RRD ring */
        for (i = 0; i < num_rx_queues; i++) {
                rrd_ring[i].dma = ring_header->dma + offset;
                rrd_ring[i].desc = (u8 *) ring_header->desc + offset;
                rrd_ring[i].size = sizeof(struct atl1c_recv_ret_status) *
                                rrd_ring[i].count;
                offset += roundup(rrd_ring[i].size, 8);
        }

        adapter->smb.dma = ring_header->dma + offset;
        adapter->smb.smb = (u8 *)ring_header->desc + offset;
        return 0;

err_nomem:
        kfree(tpd_ring->buffer_info);
        return -ENOMEM;
}

static void atl1c_configure_des_ring(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;
        struct atl1c_rfd_ring *rfd_ring = (struct atl1c_rfd_ring *)
                                adapter->rfd_ring;
        struct atl1c_rrd_ring *rrd_ring = (struct atl1c_rrd_ring *)
                                adapter->rrd_ring;
        struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
                                adapter->tpd_ring;
        struct atl1c_cmb *cmb = (struct atl1c_cmb *) &adapter->cmb;
        struct atl1c_smb *smb = (struct atl1c_smb *) &adapter->smb;
        int i;
        u32 data;

        /* TPD */
        AT_WRITE_REG(hw, REG_TX_BASE_ADDR_HI,
                        (u32)((tpd_ring[atl1c_trans_normal].dma &
                                AT_DMA_HI_ADDR_MASK) >> 32));
        /* just enable normal priority TX queue */
        AT_WRITE_REG(hw, REG_NTPD_HEAD_ADDR_LO,
                        (u32)(tpd_ring[atl1c_trans_normal].dma &
                                AT_DMA_LO_ADDR_MASK));
        AT_WRITE_REG(hw, REG_HTPD_HEAD_ADDR_LO,
                        (u32)(tpd_ring[atl1c_trans_high].dma &
                                AT_DMA_LO_ADDR_MASK));
        AT_WRITE_REG(hw, REG_TPD_RING_SIZE,
                        (u32)(tpd_ring[0].count & TPD_RING_SIZE_MASK));


        /* RFD */
        AT_WRITE_REG(hw, REG_RX_BASE_ADDR_HI,
                        (u32)((rfd_ring[0].dma & AT_DMA_HI_ADDR_MASK) >> 32));
        for (i = 0; i < adapter->num_rx_queues; i++)
                AT_WRITE_REG(hw, atl1c_rfd_addr_lo_regs[i],
                        (u32)(rfd_ring[i].dma & AT_DMA_LO_ADDR_MASK));

        AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
                        rfd_ring[0].count & RFD_RING_SIZE_MASK);
        AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
                        adapter->rx_buffer_len & RX_BUF_SIZE_MASK);

        /* RRD */
        for (i = 0; i < adapter->num_rx_queues; i++)
                AT_WRITE_REG(hw, atl1c_rrd_addr_lo_regs[i],
                        (u32)(rrd_ring[i].dma & AT_DMA_LO_ADDR_MASK));
        AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
                        (rrd_ring[0].count & RRD_RING_SIZE_MASK));

        /* CMB */
        AT_WRITE_REG(hw, REG_CMB_BASE_ADDR_LO, cmb->dma & AT_DMA_LO_ADDR_MASK);

        /* SMB */
        AT_WRITE_REG(hw, REG_SMB_BASE_ADDR_HI,
                        (u32)((smb->dma & AT_DMA_HI_ADDR_MASK) >> 32));
        AT_WRITE_REG(hw, REG_SMB_BASE_ADDR_LO,
                        (u32)(smb->dma & AT_DMA_LO_ADDR_MASK));
        if (hw->nic_type == athr_l2c_b) {
                AT_WRITE_REG(hw, REG_SRAM_RXF_LEN, 0x02a0L);
                AT_WRITE_REG(hw, REG_SRAM_TXF_LEN, 0x0100L);
                AT_WRITE_REG(hw, REG_SRAM_RXF_ADDR, 0x029f0000L);
                AT_WRITE_REG(hw, REG_SRAM_RFD0_INFO, 0x02bf02a0L);
                AT_WRITE_REG(hw, REG_SRAM_TXF_ADDR, 0x03bf02c0L);
                AT_WRITE_REG(hw, REG_SRAM_TRD_ADDR, 0x03df03c0L);
                AT_WRITE_REG(hw, REG_TXF_WATER_MARK, 0);        /* TX watermark, to enter l1 state.*/
                AT_WRITE_REG(hw, REG_RXD_DMA_CTRL, 0);          /* RXD threshold.*/
        }
        if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d_2) {
                        /* Power Saving for L2c_B */
                AT_READ_REG(hw, REG_SERDES_LOCK, &data);
                data |= SERDES_MAC_CLK_SLOWDOWN;
                data |= SERDES_PYH_CLK_SLOWDOWN;
                AT_WRITE_REG(hw, REG_SERDES_LOCK, data);
        }
        /* Load all of base address above */
        AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
}

static void atl1c_configure_tx(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;
        u32 dev_ctrl_data;
        u32 max_pay_load;
        u16 tx_offload_thresh;
        u32 txq_ctrl_data;
        u32 max_pay_load_data;

        tx_offload_thresh = MAX_TX_OFFLOAD_THRESH;
        AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
                (tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
        AT_READ_REG(hw, REG_DEVICE_CTRL, &dev_ctrl_data);
        max_pay_load  = (dev_ctrl_data >> DEVICE_CTRL_MAX_PAYLOAD_SHIFT) &
                        DEVICE_CTRL_MAX_PAYLOAD_MASK;
        hw->dmaw_block = min_t(u32, max_pay_load, hw->dmaw_block);
        max_pay_load  = (dev_ctrl_data >> DEVICE_CTRL_MAX_RREQ_SZ_SHIFT) &
                        DEVICE_CTRL_MAX_RREQ_SZ_MASK;
        hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);

        txq_ctrl_data = (hw->tpd_burst & TXQ_NUM_TPD_BURST_MASK) <<
                        TXQ_NUM_TPD_BURST_SHIFT;
        if (hw->ctrl_flags & ATL1C_TXQ_MODE_ENHANCE)
                txq_ctrl_data |= TXQ_CTRL_ENH_MODE;
        max_pay_load_data = (atl1c_pay_load_size[hw->dmar_block] &
                        TXQ_TXF_BURST_NUM_MASK) << TXQ_TXF_BURST_NUM_SHIFT;
        if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2)
                max_pay_load_data >>= 1;
        txq_ctrl_data |= max_pay_load_data;

        AT_WRITE_REG(hw, REG_TXQ_CTRL, txq_ctrl_data);
}

static void atl1c_configure_rx(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;
        u32 rxq_ctrl_data;

        rxq_ctrl_data = (hw->rfd_burst & RXQ_RFD_BURST_NUM_MASK) <<
                        RXQ_RFD_BURST_NUM_SHIFT;

        if (hw->ctrl_flags & ATL1C_RX_IPV6_CHKSUM)
                rxq_ctrl_data |= IPV6_CHKSUM_CTRL_EN;
        if (hw->rss_type == atl1c_rss_ipv4)
                rxq_ctrl_data |= RSS_HASH_IPV4;
        if (hw->rss_type == atl1c_rss_ipv4_tcp)
                rxq_ctrl_data |= RSS_HASH_IPV4_TCP;
        if (hw->rss_type == atl1c_rss_ipv6)
                rxq_ctrl_data |= RSS_HASH_IPV6;
        if (hw->rss_type == atl1c_rss_ipv6_tcp)
                rxq_ctrl_data |= RSS_HASH_IPV6_TCP;
        if (hw->rss_type != atl1c_rss_disable)
                rxq_ctrl_data |= RRS_HASH_CTRL_EN;

        rxq_ctrl_data |= (hw->rss_mode & RSS_MODE_MASK) <<
                        RSS_MODE_SHIFT;
        rxq_ctrl_data |= (hw->rss_hash_bits & RSS_HASH_BITS_MASK) <<
                        RSS_HASH_BITS_SHIFT;
        if (hw->ctrl_flags & ATL1C_ASPM_CTRL_MON)
                rxq_ctrl_data |= (ASPM_THRUPUT_LIMIT_1M &
                        ASPM_THRUPUT_LIMIT_MASK) << ASPM_THRUPUT_LIMIT_SHIFT;

        AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
}

static void atl1c_configure_rss(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;

        AT_WRITE_REG(hw, REG_IDT_TABLE, hw->indirect_tab);
        AT_WRITE_REG(hw, REG_BASE_CPU_NUMBER, hw->base_cpu);
}

static void atl1c_configure_dma(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;
        u32 dma_ctrl_data;

        dma_ctrl_data = DMA_CTRL_DMAR_REQ_PRI;
        if (hw->ctrl_flags & ATL1C_CMB_ENABLE)
                dma_ctrl_data |= DMA_CTRL_CMB_EN;
        if (hw->ctrl_flags & ATL1C_SMB_ENABLE)
                dma_ctrl_data |= DMA_CTRL_SMB_EN;
        else
                dma_ctrl_data |= MAC_CTRL_SMB_DIS;

        switch (hw->dma_order) {
        case atl1c_dma_ord_in:
                dma_ctrl_data |= DMA_CTRL_DMAR_IN_ORDER;
                break;
        case atl1c_dma_ord_enh:
                dma_ctrl_data |= DMA_CTRL_DMAR_ENH_ORDER;
                break;
        case atl1c_dma_ord_out:
                dma_ctrl_data |= DMA_CTRL_DMAR_OUT_ORDER;
                break;
        default:
                break;
        }

        dma_ctrl_data |= (((u32)hw->dmar_block) & DMA_CTRL_DMAR_BURST_LEN_MASK)
                << DMA_CTRL_DMAR_BURST_LEN_SHIFT;
        dma_ctrl_data |= (((u32)hw->dmaw_block) & DMA_CTRL_DMAW_BURST_LEN_MASK)
                << DMA_CTRL_DMAW_BURST_LEN_SHIFT;
        dma_ctrl_data |= (((u32)hw->dmar_dly_cnt) & DMA_CTRL_DMAR_DLY_CNT_MASK)
                << DMA_CTRL_DMAR_DLY_CNT_SHIFT;
        dma_ctrl_data |= (((u32)hw->dmaw_dly_cnt) & DMA_CTRL_DMAW_DLY_CNT_MASK)
                << DMA_CTRL_DMAW_DLY_CNT_SHIFT;

        AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
}

/*
 * Stop the mac, transmit and receive units
 * hw - Struct containing variables accessed by shared code
 * return : 0  or  idle status (if error)
 */
static int atl1c_stop_mac(struct atl1c_hw *hw)
{
        u32 data;

        AT_READ_REG(hw, REG_RXQ_CTRL, &data);
        data &= ~(RXQ1_CTRL_EN | RXQ2_CTRL_EN |
                  RXQ3_CTRL_EN | RXQ_CTRL_EN);
        AT_WRITE_REG(hw, REG_RXQ_CTRL, data);

        AT_READ_REG(hw, REG_TXQ_CTRL, &data);
        data &= ~TXQ_CTRL_EN;
        AT_WRITE_REG(hw, REG_TWSI_CTRL, data);

        atl1c_wait_until_idle(hw);

        AT_READ_REG(hw, REG_MAC_CTRL, &data);
        data &= ~(MAC_CTRL_TX_EN | MAC_CTRL_RX_EN);
        AT_WRITE_REG(hw, REG_MAC_CTRL, data);

        return (int)atl1c_wait_until_idle(hw);
}

static void atl1c_enable_rx_ctrl(struct atl1c_hw *hw)
{
        u32 data;

        AT_READ_REG(hw, REG_RXQ_CTRL, &data);
        switch (hw->adapter->num_rx_queues) {
        case 4:
                data |= (RXQ3_CTRL_EN | RXQ2_CTRL_EN | RXQ1_CTRL_EN);
                break;
        case 3:
                data |= (RXQ2_CTRL_EN | RXQ1_CTRL_EN);
                break;
        case 2:
                data |= RXQ1_CTRL_EN;
                break;
        default:
                break;
        }
        data |= RXQ_CTRL_EN;
        AT_WRITE_REG(hw, REG_RXQ_CTRL, data);
}

static void atl1c_enable_tx_ctrl(struct atl1c_hw *hw)
{
        u32 data;

        AT_READ_REG(hw, REG_TXQ_CTRL, &data);
        data |= TXQ_CTRL_EN;
        AT_WRITE_REG(hw, REG_TXQ_CTRL, data);
}

/*
 * Reset the transmit and receive units; mask and clear all interrupts.
 * hw - Struct containing variables accessed by shared code
 * return : 0  or  idle status (if error)
 */
static int atl1c_reset_mac(struct atl1c_hw *hw)
{
        struct atl1c_adapter *adapter = (struct atl1c_adapter *)hw->adapter;
        struct pci_dev *pdev = adapter->pdev;
        u32 master_ctrl_data = 0;

        AT_WRITE_REG(hw, REG_IMR, 0);
        AT_WRITE_REG(hw, REG_ISR, ISR_DIS_INT);

        atl1c_stop_mac(hw);
        /*
         * Issue Soft Reset to the MAC.  This will reset the chip's
         * transmit, receive, DMA.  It will not effect
         * the current PCI configuration.  The global reset bit is self-
         * clearing, and should clear within a microsecond.
         */
        AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
        master_ctrl_data |= MASTER_CTRL_OOB_DIS_OFF;
        AT_WRITE_REGW(hw, REG_MASTER_CTRL, ((master_ctrl_data | MASTER_CTRL_SOFT_RST)
                        & 0xFFFF));

        AT_WRITE_FLUSH(hw);
        msleep(10);
        /* Wait at least 10ms for All module to be Idle */

        if (atl1c_wait_until_idle(hw)) {
                dev_err(&pdev->dev,
                        "MAC state machine can't be idle since"
                        " disabled for 10ms second\n");
                return -1;
        }
        return 0;
}

static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
{
        u32 pm_ctrl_data;

        AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
        pm_ctrl_data &= ~(PM_CTRL_L1_ENTRY_TIMER_MASK <<
                        PM_CTRL_L1_ENTRY_TIMER_SHIFT);
        pm_ctrl_data &= ~PM_CTRL_CLK_SWH_L1;
        pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
        pm_ctrl_data &= ~PM_CTRL_ASPM_L1_EN;
        pm_ctrl_data &= ~PM_CTRL_MAC_ASPM_CHK;
        pm_ctrl_data &= ~PM_CTRL_SERDES_PD_EX_L1;

        pm_ctrl_data |= PM_CTRL_SERDES_BUDS_RX_L1_EN;
        pm_ctrl_data |= PM_CTRL_SERDES_PLL_L1_EN;
        pm_ctrl_data |= PM_CTRL_SERDES_L1_EN;
        AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
}

/*
 * Set ASPM state.
 * Enable/disable L0s/L1 depend on link state.
 */
static void atl1c_set_aspm(struct atl1c_hw *hw, bool linkup)
{
        u32 pm_ctrl_data;
        u32 link_ctrl_data;
        u32 link_l1_timer = 0xF;

        AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
        AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);

        pm_ctrl_data &= ~PM_CTRL_SERDES_PD_EX_L1;
        pm_ctrl_data &=  ~(PM_CTRL_L1_ENTRY_TIMER_MASK <<
                        PM_CTRL_L1_ENTRY_TIMER_SHIFT);
        pm_ctrl_data &= ~(PM_CTRL_LCKDET_TIMER_MASK <<
                        PM_CTRL_LCKDET_TIMER_SHIFT);
        pm_ctrl_data |= AT_LCKDET_TIMER << PM_CTRL_LCKDET_TIMER_SHIFT;

        if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
                hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
                link_ctrl_data &= ~LINK_CTRL_EXT_SYNC;
                if (!(hw->ctrl_flags & ATL1C_APS_MODE_ENABLE)) {
                        if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10)
                                link_ctrl_data |= LINK_CTRL_EXT_SYNC;
                }

                AT_WRITE_REG(hw, REG_LINK_CTRL, link_ctrl_data);

                pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER;
                pm_ctrl_data &= ~(PM_CTRL_PM_REQ_TIMER_MASK <<
                        PM_CTRL_PM_REQ_TIMER_SHIFT);
                pm_ctrl_data |= AT_ASPM_L1_TIMER <<
                        PM_CTRL_PM_REQ_TIMER_SHIFT;
                pm_ctrl_data &= ~PM_CTRL_SA_DLY_EN;
                pm_ctrl_data &= ~PM_CTRL_HOTRST;
                pm_ctrl_data |= 1 << PM_CTRL_L1_ENTRY_TIMER_SHIFT;
                pm_ctrl_data |= PM_CTRL_SERDES_PD_EX_L1;
        }
        pm_ctrl_data |= PM_CTRL_MAC_ASPM_CHK;
        if (linkup) {
                pm_ctrl_data &= ~PM_CTRL_ASPM_L1_EN;
                pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
                if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
                        pm_ctrl_data |= PM_CTRL_ASPM_L1_EN;
                if (hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT)
                        pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN;

                if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
                        hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
                        if (hw->nic_type == athr_l2c_b)
                                if (!(hw->ctrl_flags & ATL1C_APS_MODE_ENABLE))
                                        pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
                        pm_ctrl_data &= ~PM_CTRL_SERDES_L1_EN;
                        pm_ctrl_data &= ~PM_CTRL_SERDES_PLL_L1_EN;
                        pm_ctrl_data &= ~PM_CTRL_SERDES_BUDS_RX_L1_EN;
                        pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
                if (hw->adapter->link_speed == SPEED_100 ||
                                hw->adapter->link_speed == SPEED_1000) {
                                pm_ctrl_data &=  ~(PM_CTRL_L1_ENTRY_TIMER_MASK <<
                                        PM_CTRL_L1_ENTRY_TIMER_SHIFT);
                                if (hw->nic_type == athr_l2c_b)
                                        link_l1_timer = 7;
                                else if (hw->nic_type == athr_l2c_b2 ||
                                        hw->nic_type == athr_l1d_2)
                                        link_l1_timer = 4;
                                pm_ctrl_data |= link_l1_timer <<
                                        PM_CTRL_L1_ENTRY_TIMER_SHIFT;
                        }
                } else {
                        pm_ctrl_data |= PM_CTRL_SERDES_L1_EN;
                        pm_ctrl_data |= PM_CTRL_SERDES_PLL_L1_EN;
                        pm_ctrl_data |= PM_CTRL_SERDES_BUDS_RX_L1_EN;
                        pm_ctrl_data &= ~PM_CTRL_CLK_SWH_L1;
                        pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
                        pm_ctrl_data &= ~PM_CTRL_ASPM_L1_EN;

                }
        } else {
                pm_ctrl_data &= ~PM_CTRL_SERDES_L1_EN;
                pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
                pm_ctrl_data &= ~PM_CTRL_SERDES_PLL_L1_EN;
                pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;

                if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
                        pm_ctrl_data |= PM_CTRL_ASPM_L1_EN;
                else
                        pm_ctrl_data &= ~PM_CTRL_ASPM_L1_EN;
        }
        AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);

        return;
}

static void atl1c_setup_mac_ctrl(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        u32 mac_ctrl_data;

        mac_ctrl_data = MAC_CTRL_TX_EN | MAC_CTRL_RX_EN;
        mac_ctrl_data |= (MAC_CTRL_TX_FLOW | MAC_CTRL_RX_FLOW);

        if (adapter->link_duplex == FULL_DUPLEX) {
                hw->mac_duplex = true;
                mac_ctrl_data |= MAC_CTRL_DUPLX;
        }

        if (adapter->link_speed == SPEED_1000)
                hw->mac_speed = atl1c_mac_speed_1000;
        else
                hw->mac_speed = atl1c_mac_speed_10_100;

        mac_ctrl_data |= (hw->mac_speed & MAC_CTRL_SPEED_MASK) <<
                        MAC_CTRL_SPEED_SHIFT;

        mac_ctrl_data |= (MAC_CTRL_ADD_CRC | MAC_CTRL_PAD);
        mac_ctrl_data |= ((hw->preamble_len & MAC_CTRL_PRMLEN_MASK) <<
                        MAC_CTRL_PRMLEN_SHIFT);

        __atl1c_vlan_mode(netdev->features, &mac_ctrl_data);

        mac_ctrl_data |= MAC_CTRL_BC_EN;
        if (netdev->flags & IFF_PROMISC)
                mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
        if (netdev->flags & IFF_ALLMULTI)
                mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;

        mac_ctrl_data |= MAC_CTRL_SINGLE_PAUSE_EN;
        if (hw->nic_type == athr_l1d || hw->nic_type == athr_l2c_b2 ||
            hw->nic_type == athr_l1d_2) {
                mac_ctrl_data |= MAC_CTRL_SPEED_MODE_SW;
                mac_ctrl_data |= MAC_CTRL_HASH_ALG_CRC32;
        }
        AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
}

/*
 * atl1c_configure - Configure Transmit&Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx /Rx unit of the MAC after a reset.
 */
static int atl1c_configure(struct atl1c_adapter *adapter)
{
        struct atl1c_hw *hw = &adapter->hw;
        u32 master_ctrl_data = 0;
        u32 intr_modrt_data;
        u32 data;

        /* clear interrupt status */
        AT_WRITE_REG(hw, REG_ISR, 0xFFFFFFFF);
        /*  Clear any WOL status */
        AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
        /* set Interrupt Clear Timer
         * HW will enable self to assert interrupt event to system after
         * waiting x-time for software to notify it accept interrupt.
         */

        data = CLK_GATING_EN_ALL;
        if (hw->ctrl_flags & ATL1C_CLK_GATING_EN) {
                if (hw->nic_type == athr_l2c_b)
                        data &= ~CLK_GATING_RXMAC_EN;
        } else
                data = 0;
        AT_WRITE_REG(hw, REG_CLK_GATING_CTRL, data);

        AT_WRITE_REG(hw, REG_INT_RETRIG_TIMER,
                hw->ict & INT_RETRIG_TIMER_MASK);

        atl1c_configure_des_ring(adapter);

        if (hw->ctrl_flags & ATL1C_INTR_MODRT_ENABLE) {
                intr_modrt_data = (hw->tx_imt & IRQ_MODRT_TIMER_MASK) <<
                                        IRQ_MODRT_TX_TIMER_SHIFT;
                intr_modrt_data |= (hw->rx_imt & IRQ_MODRT_TIMER_MASK) <<
                                        IRQ_MODRT_RX_TIMER_SHIFT;
                AT_WRITE_REG(hw, REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
                master_ctrl_data |=
                        MASTER_CTRL_TX_ITIMER_EN | MASTER_CTRL_RX_ITIMER_EN;
        }

        if (hw->ctrl_flags & ATL1C_INTR_CLEAR_ON_READ)
                master_ctrl_data |= MASTER_CTRL_INT_RDCLR;

        master_ctrl_data |= MASTER_CTRL_SA_TIMER_EN;
        AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);

        if (hw->ctrl_flags & ATL1C_CMB_ENABLE) {
                AT_WRITE_REG(hw, REG_CMB_TPD_THRESH,
                        hw->cmb_tpd & CMB_TPD_THRESH_MASK);
                AT_WRITE_REG(hw, REG_CMB_TX_TIMER,
                        hw->cmb_tx_timer & CMB_TX_TIMER_MASK);
        }

        if (hw->ctrl_flags & ATL1C_SMB_ENABLE)
                AT_WRITE_REG(hw, REG_SMB_STAT_TIMER,
                        hw->smb_timer & SMB_STAT_TIMER_MASK);
        /* set MTU */
        AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
                        VLAN_HLEN + ETH_FCS_LEN);
        /* HDS, disable */
        AT_WRITE_REG(hw, REG_HDS_CTRL, 0);

        atl1c_configure_tx(adapter);
        atl1c_configure_rx(adapter);
        atl1c_configure_rss(adapter);
        atl1c_configure_dma(adapter);

        return 0;
}

static void atl1c_update_hw_stats(struct atl1c_adapter *adapter)
{
        u16 hw_reg_addr = 0;
        unsigned long *stats_item = NULL;
        u32 data;

        /* update rx status */
        hw_reg_addr = REG_MAC_RX_STATUS_BIN;
        stats_item  = &adapter->hw_stats.rx_ok;
        while (hw_reg_addr <= REG_MAC_RX_STATUS_END) {
                AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
                *stats_item += data;
                stats_item++;
                hw_reg_addr += 4;
        }
/* update tx status */
        hw_reg_addr = REG_MAC_TX_STATUS_BIN;
        stats_item  = &adapter->hw_stats.tx_ok;
        while (hw_reg_addr <= REG_MAC_TX_STATUS_END) {
                AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
                *stats_item += data;
                stats_item++;
                hw_reg_addr += 4;
        }
}

/*
 * atl1c_get_stats - Get System Network Statistics
 * @netdev: network interface device structure
 *
 * Returns the address of the device statistics structure.
 * The statistics are actually updated from the timer callback.
 */
static struct net_device_stats *atl1c_get_stats(struct net_device *netdev)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        struct atl1c_hw_stats  *hw_stats = &adapter->hw_stats;
        struct net_device_stats *net_stats = &netdev->stats;

        atl1c_update_hw_stats(adapter);
        net_stats->rx_packets = hw_stats->rx_ok;
        net_stats->tx_packets = hw_stats->tx_ok;
        net_stats->rx_bytes   = hw_stats->rx_byte_cnt;
        net_stats->tx_bytes   = hw_stats->tx_byte_cnt;
        net_stats->multicast  = hw_stats->rx_mcast;
        net_stats->collisions = hw_stats->tx_1_col +
                                hw_stats->tx_2_col * 2 +
                                hw_stats->tx_late_col + hw_stats->tx_abort_col;
        net_stats->rx_errors  = hw_stats->rx_frag + hw_stats->rx_fcs_err +
                                hw_stats->rx_len_err + hw_stats->rx_sz_ov +
                                hw_stats->rx_rrd_ov + hw_stats->rx_align_err;
        net_stats->rx_fifo_errors   = hw_stats->rx_rxf_ov;
        net_stats->rx_length_errors = hw_stats->rx_len_err;
        net_stats->rx_crc_errors    = hw_stats->rx_fcs_err;
        net_stats->rx_frame_errors  = hw_stats->rx_align_err;
        net_stats->rx_over_errors   = hw_stats->rx_rrd_ov + hw_stats->rx_rxf_ov;

        net_stats->rx_missed_errors = hw_stats->rx_rrd_ov + hw_stats->rx_rxf_ov;

        net_stats->tx_errors = hw_stats->tx_late_col + hw_stats->tx_abort_col +
                                hw_stats->tx_underrun + hw_stats->tx_trunc;
        net_stats->tx_fifo_errors    = hw_stats->tx_underrun;
        net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
        net_stats->tx_window_errors  = hw_stats->tx_late_col;

        return net_stats;
}

static inline void atl1c_clear_phy_int(struct atl1c_adapter *adapter)
{
        u16 phy_data;

        spin_lock(&adapter->mdio_lock);
        atl1c_read_phy_reg(&adapter->hw, MII_ISR, &phy_data);
        spin_unlock(&adapter->mdio_lock);
}

static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter,
                                enum atl1c_trans_queue type)
{
        struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
                                &adapter->tpd_ring[type];
        struct atl1c_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
        u16 hw_next_to_clean;
        u16 shift;
        u32 data;

        if (type == atl1c_trans_high)
                shift = MB_HTPD_CONS_IDX_SHIFT;
        else
                shift = MB_NTPD_CONS_IDX_SHIFT;

        AT_READ_REG(&adapter->hw, REG_MB_PRIO_CONS_IDX, &data);
        hw_next_to_clean = (data >> shift) & MB_PRIO_PROD_IDX_MASK;

        while (next_to_clean != hw_next_to_clean) {
                buffer_info = &tpd_ring->buffer_info[next_to_clean];
                atl1c_clean_buffer(pdev, buffer_info, 1);
                if (++next_to_clean == tpd_ring->count)
                        next_to_clean = 0;
                atomic_set(&tpd_ring->next_to_clean, next_to_clean);
        }

        if (netif_queue_stopped(adapter->netdev) &&
                        netif_carrier_ok(adapter->netdev)) {
                netif_wake_queue(adapter->netdev);
        }

        return true;
}

/*
 * atl1c_intr - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 * @pt_regs: CPU registers structure
 */
static irqreturn_t atl1c_intr(int irq, void *data)
{
        struct net_device *netdev  = data;
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        struct pci_dev *pdev = adapter->pdev;
        struct atl1c_hw *hw = &adapter->hw;
        int max_ints = AT_MAX_INT_WORK;
        int handled = IRQ_NONE;
        u32 status;
        u32 reg_data;

        do {
                AT_READ_REG(hw, REG_ISR, &reg_data);
                status = reg_data & hw->intr_mask;

                if (status == 0 || (status & ISR_DIS_INT) != 0) {
                        if (max_ints != AT_MAX_INT_WORK)
                                handled = IRQ_HANDLED;
                        break;
                }
                /* link event */
                if (status & ISR_GPHY)
                        atl1c_clear_phy_int(adapter);
                /* Ack ISR */
                AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);
                if (status & ISR_RX_PKT) {
                        if (likely(napi_schedule_prep(&adapter->napi))) {
                                hw->intr_mask &= ~ISR_RX_PKT;
                                AT_WRITE_REG(hw, REG_IMR, hw->intr_mask);
                                __napi_schedule(&adapter->napi);
                        }
                }
                if (status & ISR_TX_PKT)
                        atl1c_clean_tx_irq(adapter, atl1c_trans_normal);

                handled = IRQ_HANDLED;
                /* check if PCIE PHY Link down */
                if (status & ISR_ERROR) {
                        if (netif_msg_hw(adapter))
                                dev_err(&pdev->dev,
                                        "atl1c hardware error (status = 0x%x)\n",
                                        status & ISR_ERROR);
                        /* reset MAC */
                        set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
                        schedule_work(&adapter->common_task);
                        return IRQ_HANDLED;
                }

                if (status & ISR_OVER)
                        if (netif_msg_intr(adapter))
                                dev_warn(&pdev->dev,
                                        "TX/RX overflow (status = 0x%x)\n",
                                        status & ISR_OVER);

                /* link event */
                if (status & (ISR_GPHY | ISR_MANUAL)) {
                        netdev->stats.tx_carrier_errors++;
                        atl1c_link_chg_event(adapter);
                        break;
                }

        } while (--max_ints > 0);
        /* re-enable Interrupt*/
        AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
        return handled;
}

static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,
                  struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)
{
        /*
         * The pid field in RRS in not correct sometimes, so we
         * cannot figure out if the packet is fragmented or not,
         * so we tell the KERNEL CHECKSUM_NONE
         */
        skb_checksum_none_assert(skb);
}

static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter, const int ringid)
{
        struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring[ringid];
        struct pci_dev *pdev = adapter->pdev;
        struct atl1c_buffer *buffer_info, *next_info;
        struct sk_buff *skb;
        void *vir_addr = NULL;
        u16 num_alloc = 0;
        u16 rfd_next_to_use, next_next;
        struct atl1c_rx_free_desc *rfd_desc;

        next_next = rfd_next_to_use = rfd_ring->next_to_use;
        if (++next_next == rfd_ring->count)
                next_next = 0;
        buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
        next_info = &rfd_ring->buffer_info[next_next];

        while (next_info->flags & ATL1C_BUFFER_FREE) {
                rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);

                skb = netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len);
                if (unlikely(!skb)) {
                        if (netif_msg_rx_err(adapter))
                                dev_warn(&pdev->dev, "alloc rx buffer failed\n");
                        break;
                }

                /*
                 * Make buffer alignment 2 beyond a 16 byte boundary
                 * this will result in a 16 byte aligned IP header after
                 * the 14 byte MAC header is removed
                 */
                vir_addr = skb->data;
                ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
                buffer_info->skb = skb;
                buffer_info->length = adapter->rx_buffer_len;
                buffer_info->dma = pci_map_single(pdev, vir_addr,
                                                buffer_info->length,
                                                PCI_DMA_FROMDEVICE);
                ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
                        ATL1C_PCIMAP_FROMDEVICE);
                rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
                rfd_next_to_use = next_next;
                if (++next_next == rfd_ring->count)
                        next_next = 0;
                buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
                next_info = &rfd_ring->buffer_info[next_next];
                num_alloc++;
        }

        if (num_alloc) {
                /* TODO: update mailbox here */
                wmb();
                rfd_ring->next_to_use = rfd_next_to_use;
                AT_WRITE_REG(&adapter->hw, atl1c_rfd_prod_idx_regs[ringid],
                        rfd_ring->next_to_use & MB_RFDX_PROD_IDX_MASK);
        }

        return num_alloc;
}

static void atl1c_clean_rrd(struct atl1c_rrd_ring *rrd_ring,
                        struct  atl1c_recv_ret_status *rrs, u16 num)
{
        u16 i;
        /* the relationship between rrd and rfd is one map one */
        for (i = 0; i < num; i++, rrs = ATL1C_RRD_DESC(rrd_ring,
                                        rrd_ring->next_to_clean)) {
                rrs->word3 &= ~RRS_RXD_UPDATED;
                if (++rrd_ring->next_to_clean == rrd_ring->count)
                        rrd_ring->next_to_clean = 0;
        }
}

static void atl1c_clean_rfd(struct atl1c_rfd_ring *rfd_ring,
        struct atl1c_recv_ret_status *rrs, u16 num)
{
        u16 i;
        u16 rfd_index;
        struct atl1c_buffer *buffer_info = rfd_ring->buffer_info;

        rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
                        RRS_RX_RFD_INDEX_MASK;
        for (i = 0; i < num; i++) {
                buffer_info[rfd_index].skb = NULL;
                ATL1C_SET_BUFFER_STATE(&buffer_info[rfd_index],
                                        ATL1C_BUFFER_FREE);
                if (++rfd_index == rfd_ring->count)
                        rfd_index = 0;
        }
        rfd_ring->next_to_clean = rfd_index;
}

static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter, u8 que,
                   int *work_done, int work_to_do)
{
        u16 rfd_num, rfd_index;
        u16 count = 0;
        u16 length;
        struct pci_dev *pdev = adapter->pdev;
        struct net_device *netdev  = adapter->netdev;
        struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring[que];
        struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring[que];
        struct sk_buff *skb;
        struct atl1c_recv_ret_status *rrs;
        struct atl1c_buffer *buffer_info;

        while (1) {
                if (*work_done >= work_to_do)
                        break;
                rrs = ATL1C_RRD_DESC(rrd_ring, rrd_ring->next_to_clean);
                if (likely(RRS_RXD_IS_VALID(rrs->word3))) {
                        rfd_num = (rrs->word0 >> RRS_RX_RFD_CNT_SHIFT) &
                                RRS_RX_RFD_CNT_MASK;
                        if (unlikely(rfd_num != 1))
                                /* TODO support mul rfd*/
                                if (netif_msg_rx_err(adapter))
                                        dev_warn(&pdev->dev,
                                                "Multi rfd not support yet!\n");
                        goto rrs_checked;
                } else {
                        break;
                }
rrs_checked:
                atl1c_clean_rrd(rrd_ring, rrs, rfd_num);
                if (rrs->word3 & (RRS_RX_ERR_SUM | RRS_802_3_LEN_ERR)) {
                        atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
                                if (netif_msg_rx_err(adapter))
                                        dev_warn(&pdev->dev,
                                                "wrong packet! rrs word3 is %x\n",
                                                rrs->word3);
                        continue;
                }

                length = le16_to_cpu((rrs->word3 >> RRS_PKT_SIZE_SHIFT) &
                                RRS_PKT_SIZE_MASK);
                /* Good Receive */
                if (likely(rfd_num == 1)) {
                        rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
                                        RRS_RX_RFD_INDEX_MASK;
                        buffer_info = &rfd_ring->buffer_info[rfd_index];
                        pci_unmap_single(pdev, buffer_info->dma,
                                buffer_info->length, PCI_DMA_FROMDEVICE);
                        skb = buffer_info->skb;
                } else {
                        /* TODO */
                        if (netif_msg_rx_err(adapter))
                                dev_warn(&pdev->dev,
                                        "Multi rfd not support yet!\n");
                        break;
                }
                atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
                skb_put(skb, length - ETH_FCS_LEN);
                skb->protocol = eth_type_trans(skb, netdev);
                atl1c_rx_checksum(adapter, skb, rrs);
                if (rrs->word3 & RRS_VLAN_INS) {
                        u16 vlan;

                        AT_TAG_TO_VLAN(rrs->vlan_tag, vlan);
                        vlan = le16_to_cpu(vlan);
                        __vlan_hwaccel_put_tag(skb, vlan);
                }
                netif_receive_skb(skb);

                (*work_done)++;
                count++;
        }
        if (count)
                atl1c_alloc_rx_buffer(adapter, que);
}

/*
 * atl1c_clean - NAPI Rx polling callback
 * @adapter: board private structure
 */
static int atl1c_clean(struct napi_struct *napi, int budget)
{
        struct atl1c_adapter *adapter =
                        container_of(napi, struct atl1c_adapter, napi);
        int work_done = 0;

        /* Keep link state information with original netdev */
        if (!netif_carrier_ok(adapter->netdev))
                goto quit_polling;
        /* just enable one RXQ */
        atl1c_clean_rx_irq(adapter, 0, &work_done, budget);

        if (work_done < budget) {
quit_polling:
                napi_complete(napi);
                adapter->hw.intr_mask |= ISR_RX_PKT;
                AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
        }
        return work_done;
}

#ifdef CONFIG_NET_POLL_CONTROLLER

/*
 * Polling 'interrupt' - used by things like netconsole to send skbs
 * without having to re-enable interrupts. It's not called while
 * the interrupt routine is executing.
 */
static void atl1c_netpoll(struct net_device *netdev)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        disable_irq(adapter->pdev->irq);
        atl1c_intr(adapter->pdev->irq, netdev);
        enable_irq(adapter->pdev->irq);
}
#endif

static inline u16 atl1c_tpd_avail(struct atl1c_adapter *adapter, enum atl1c_trans_queue type)
{
        struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
        u16 next_to_use = 0;
        u16 next_to_clean = 0;

        next_to_clean = atomic_read(&tpd_ring->next_to_clean);
        next_to_use   = tpd_ring->next_to_use;

        return (u16)(next_to_clean > next_to_use) ?
                (next_to_clean - next_to_use - 1) :
                (tpd_ring->count + next_to_clean - next_to_use - 1);
}

/*
 * get next usable tpd
 * Note: should call atl1c_tdp_avail to make sure
 * there is enough tpd to use
 */
static struct atl1c_tpd_desc *atl1c_get_tpd(struct atl1c_adapter *adapter,
        enum atl1c_trans_queue type)
{
        struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
        struct atl1c_tpd_desc *tpd_desc;
        u16 next_to_use = 0;

        next_to_use = tpd_ring->next_to_use;
        if (++tpd_ring->next_to_use == tpd_ring->count)
                tpd_ring->next_to_use = 0;
        tpd_desc = ATL1C_TPD_DESC(tpd_ring, next_to_use);
        memset(tpd_desc, 0, sizeof(struct atl1c_tpd_desc));
        return  tpd_desc;
}

static struct atl1c_buffer *
atl1c_get_tx_buffer(struct atl1c_adapter *adapter, struct atl1c_tpd_desc *tpd)
{
        struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;

        return &tpd_ring->buffer_info[tpd -
                        (struct atl1c_tpd_desc *)tpd_ring->desc];
}

/* Calculate the transmit packet descript needed*/
static u16 atl1c_cal_tpd_req(const struct sk_buff *skb)
{
        u16 tpd_req;
        u16 proto_hdr_len = 0;

        tpd_req = skb_shinfo(skb)->nr_frags + 1;

        if (skb_is_gso(skb)) {
                proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
                if (proto_hdr_len < skb_headlen(skb))
                        tpd_req++;
                if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
                        tpd_req++;
        }
        return tpd_req;
}

static int atl1c_tso_csum(struct atl1c_adapter *adapter,
                          struct sk_buff *skb,
                          struct atl1c_tpd_desc **tpd,
                          enum atl1c_trans_queue type)
{
        struct pci_dev *pdev = adapter->pdev;
        u8 hdr_len;
        u32 real_len;
        unsigned short offload_type;
        int err;

        if (skb_is_gso(skb)) {
                if (skb_header_cloned(skb)) {
                        err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
                        if (unlikely(err))
                                return -1;
                }
                offload_type = skb_shinfo(skb)->gso_type;

                if (offload_type & SKB_GSO_TCPV4) {
                        real_len = (((unsigned char *)ip_hdr(skb) - skb->data)
                                        + ntohs(ip_hdr(skb)->tot_len));

                        if (real_len < skb->len)
                                pskb_trim(skb, real_len);

                        hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
                        if (unlikely(skb->len == hdr_len)) {
                                /* only xsum need */
                                if (netif_msg_tx_queued(adapter))
                                        dev_warn(&pdev->dev,
                                                "IPV4 tso with zero data??\n");
                                goto check_sum;
                        } else {
                                ip_hdr(skb)->check = 0;
                                tcp_hdr(skb)->check = ~csum_tcpudp_magic(
                                                        ip_hdr(skb)->saddr,
                                                        ip_hdr(skb)->daddr,
                                                        0, IPPROTO_TCP, 0);
                                (*tpd)->word1 |= 1 << TPD_IPV4_PACKET_SHIFT;
                        }
                }

                if (offload_type & SKB_GSO_TCPV6) {
                        struct atl1c_tpd_ext_desc *etpd =
                                *(struct atl1c_tpd_ext_desc **)(tpd);

                        memset(etpd, 0, sizeof(struct atl1c_tpd_ext_desc));
                        *tpd = atl1c_get_tpd(adapter, type);
                        ipv6_hdr(skb)->payload_len = 0;
                        /* check payload == 0 byte ? */
                        hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
                        if (unlikely(skb->len == hdr_len)) {
                                /* only xsum need */
                                if (netif_msg_tx_queued(adapter))
                                        dev_warn(&pdev->dev,
                                                "IPV6 tso with zero data??\n");
                                goto check_sum;
                        } else
                                tcp_hdr(skb)->check = ~csum_ipv6_magic(
                                                &ipv6_hdr(skb)->saddr,
                                                &ipv6_hdr(skb)->daddr,
                                                0, IPPROTO_TCP, 0);
                        etpd->word1 |= 1 << TPD_LSO_EN_SHIFT;
                        etpd->word1 |= 1 << TPD_LSO_VER_SHIFT;
                        etpd->pkt_len = cpu_to_le32(skb->len);
                        (*tpd)->word1 |= 1 << TPD_LSO_VER_SHIFT;
                }

                (*tpd)->word1 |= 1 << TPD_LSO_EN_SHIFT;
                (*tpd)->word1 |= (skb_transport_offset(skb) & TPD_TCPHDR_OFFSET_MASK) <<
                                TPD_TCPHDR_OFFSET_SHIFT;
                (*tpd)->word1 |= (skb_shinfo(skb)->gso_size & TPD_MSS_MASK) <<
                                TPD_MSS_SHIFT;
                return 0;
        }

check_sum:
        if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
                u8 css, cso;
                cso = skb_checksum_start_offset(skb);

                if (unlikely(cso & 0x1)) {
                        if (netif_msg_tx_err(adapter))
                                dev_err(&adapter->pdev->dev,
                                        "payload offset should not an event number\n");
                        return -1;
                } else {
                        css = cso + skb->csum_offset;

                        (*tpd)->word1 |= ((cso >> 1) & TPD_PLOADOFFSET_MASK) <<
                                        TPD_PLOADOFFSET_SHIFT;
                        (*tpd)->word1 |= ((css >> 1) & TPD_CCSUM_OFFSET_MASK) <<
                                        TPD_CCSUM_OFFSET_SHIFT;
                        (*tpd)->word1 |= 1 << TPD_CCSUM_EN_SHIFT;
                }
        }
        return 0;
}

static void atl1c_tx_map(struct atl1c_adapter *adapter,
                      struct sk_buff *skb, struct atl1c_tpd_desc *tpd,
                        enum atl1c_trans_queue type)
{
        struct atl1c_tpd_desc *use_tpd = NULL;
        struct atl1c_buffer *buffer_info = NULL;
        u16 buf_len = skb_headlen(skb);
        u16 map_len = 0;
        u16 mapped_len = 0;
        u16 hdr_len = 0;
        u16 nr_frags;
        u16 f;
        int tso;

        nr_frags = skb_shinfo(skb)->nr_frags;
        tso = (tpd->word1 >> TPD_LSO_EN_SHIFT) & TPD_LSO_EN_MASK;
        if (tso) {
                /* TSO */
                map_len = hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
                use_tpd = tpd;

                buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
                buffer_info->length = map_len;
                buffer_info->dma = pci_map_single(adapter->pdev,
                                        skb->data, hdr_len, PCI_DMA_TODEVICE);
                ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
                ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
                        ATL1C_PCIMAP_TODEVICE);
                mapped_len += map_len;
                use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
                use_tpd->buffer_len = cpu_to_le16(buffer_info->length);
        }

        if (mapped_len < buf_len) {
                /* mapped_len == 0, means we should use the first tpd,
                   which is given by caller  */
                if (mapped_len == 0)
                        use_tpd = tpd;
                else {
                        use_tpd = atl1c_get_tpd(adapter, type);
                        memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
                }
                buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
                buffer_info->length = buf_len - mapped_len;
                buffer_info->dma =
                        pci_map_single(adapter->pdev, skb->data + mapped_len,
                                        buffer_info->length, PCI_DMA_TODEVICE);
                ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
                ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
                        ATL1C_PCIMAP_TODEVICE);
                use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
                use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
        }

        for (f = 0; f < nr_frags; f++) {
                struct skb_frag_struct *frag;

                frag = &skb_shinfo(skb)->frags[f];

                use_tpd = atl1c_get_tpd(adapter, type);
                memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));

                buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
                buffer_info->length = skb_frag_size(frag);
                buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
                                                    frag, 0,
                                                    buffer_info->length,
                                                    DMA_TO_DEVICE);
                ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
                ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_PAGE,
                        ATL1C_PCIMAP_TODEVICE);
                use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
                use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
        }

        /* The last tpd */
        use_tpd->word1 |= 1 << TPD_EOP_SHIFT;
        /* The last buffer info contain the skb address,
           so it will be free after unmap */
        buffer_info->skb = skb;
}

static void atl1c_tx_queue(struct atl1c_adapter *adapter, struct sk_buff *skb,
                           struct atl1c_tpd_desc *tpd, enum atl1c_trans_queue type)
{
        struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
        u32 prod_data;

        AT_READ_REG(&adapter->hw, REG_MB_PRIO_PROD_IDX, &prod_data);
        switch (type) {
        case atl1c_trans_high:
                prod_data &= 0xFFFF0000;
                prod_data |= tpd_ring->next_to_use & 0xFFFF;
                break;
        case atl1c_trans_normal:
                prod_data &= 0x0000FFFF;
                prod_data |= (tpd_ring->next_to_use & 0xFFFF) << 16;
                break;
        default:
                break;
        }
        wmb();
        AT_WRITE_REG(&adapter->hw, REG_MB_PRIO_PROD_IDX, prod_data);
}

static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
                                          struct net_device *netdev)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        unsigned long flags;
        u16 tpd_req = 1;
        struct atl1c_tpd_desc *tpd;
        enum atl1c_trans_queue type = atl1c_trans_normal;

        if (test_bit(__AT_DOWN, &adapter->flags)) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        tpd_req = atl1c_cal_tpd_req(skb);
        if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
                if (netif_msg_pktdata(adapter))
                        dev_info(&adapter->pdev->dev, "tx locked\n");
                return NETDEV_TX_LOCKED;
        }

        if (atl1c_tpd_avail(adapter, type) < tpd_req) {
                /* no enough descriptor, just stop queue */
                netif_stop_queue(netdev);
                spin_unlock_irqrestore(&adapter->tx_lock, flags);
                return NETDEV_TX_BUSY;
        }

        tpd = atl1c_get_tpd(adapter, type);

        /* do TSO and check sum */
        if (atl1c_tso_csum(adapter, skb, &tpd, type) != 0) {
                spin_unlock_irqrestore(&adapter->tx_lock, flags);
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (unlikely(vlan_tx_tag_present(skb))) {
                u16 vlan = vlan_tx_tag_get(skb);
                __le16 tag;

                vlan = cpu_to_le16(vlan);
                AT_VLAN_TO_TAG(vlan, tag);
                tpd->word1 |= 1 << TPD_INS_VTAG_SHIFT;
                tpd->vlan_tag = tag;
        }

        if (skb_network_offset(skb) != ETH_HLEN)
                tpd->word1 |= 1 << TPD_ETH_TYPE_SHIFT; /* Ethernet frame */

        atl1c_tx_map(adapter, skb, tpd, type);
        atl1c_tx_queue(adapter, skb, tpd, type);

        spin_unlock_irqrestore(&adapter->tx_lock, flags);
        return NETDEV_TX_OK;
}

static void atl1c_free_irq(struct atl1c_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        free_irq(adapter->pdev->irq, netdev);

        if (adapter->have_msi)
                pci_disable_msi(adapter->pdev);
}

static int atl1c_request_irq(struct atl1c_adapter *adapter)
{
        struct pci_dev    *pdev   = adapter->pdev;
        struct net_device *netdev = adapter->netdev;
        int flags = 0;
        int err = 0;

        adapter->have_msi = true;
        err = pci_enable_msi(adapter->pdev);
        if (err) {
                if (netif_msg_ifup(adapter))
                        dev_err(&pdev->dev,
                                "Unable to allocate MSI interrupt Error: %d\n",
                                err);
                adapter->have_msi = false;
        } else
                netdev->irq = pdev->irq;

        if (!adapter->have_msi)
                flags |= IRQF_SHARED;
        err = request_irq(adapter->pdev->irq, atl1c_intr, flags,
                        netdev->name, netdev);
        if (err) {
                if (netif_msg_ifup(adapter))
                        dev_err(&pdev->dev,
                                "Unable to allocate interrupt Error: %d\n",
                                err);
                if (adapter->have_msi)
                        pci_disable_msi(adapter->pdev);
                return err;
        }
        if (netif_msg_ifup(adapter))
                dev_dbg(&pdev->dev, "atl1c_request_irq OK\n");
        return err;
}

static int atl1c_up(struct atl1c_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int num;
        int err;
        int i;

        netif_carrier_off(netdev);
        atl1c_init_ring_ptrs(adapter);
        atl1c_set_multi(netdev);
        atl1c_restore_vlan(adapter);

        for (i = 0; i < adapter->num_rx_queues; i++) {
                num = atl1c_alloc_rx_buffer(adapter, i);
                if (unlikely(num == 0)) {
                        err = -ENOMEM;
                        goto err_alloc_rx;
                }
        }

        if (atl1c_configure(adapter)) {
                err = -EIO;
                goto err_up;
        }

        err = atl1c_request_irq(adapter);
        if (unlikely(err))
                goto err_up;

        clear_bit(__AT_DOWN, &adapter->flags);
        napi_enable(&adapter->napi);
        atl1c_irq_enable(adapter);
        atl1c_check_link_status(adapter);
        netif_start_queue(netdev);
        return err;

err_up:
err_alloc_rx:
        atl1c_clean_rx_ring(adapter);
        return err;
}

static void atl1c_down(struct atl1c_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        atl1c_del_timer(adapter);
        adapter->work_event = 0; /* clear all event */
        /* signal that we're down so the interrupt handler does not
         * reschedule our watchdog timer */
        set_bit(__AT_DOWN, &adapter->flags);
        netif_carrier_off(netdev);
        napi_disable(&adapter->napi);
        atl1c_irq_disable(adapter);
        atl1c_free_irq(adapter);
        /* reset MAC to disable all RX/TX */
        atl1c_reset_mac(&adapter->hw);
        msleep(1);

        adapter->link_speed = SPEED_0;
        adapter->link_duplex = -1;
        atl1c_clean_tx_ring(adapter, atl1c_trans_normal);
        atl1c_clean_tx_ring(adapter, atl1c_trans_high);
        atl1c_clean_rx_ring(adapter);
}

/*
 * atl1c_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 */
static int atl1c_open(struct net_device *netdev)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        int err;

        /* disallow open during test */
        if (test_bit(__AT_TESTING, &adapter->flags))
                return -EBUSY;

        /* allocate rx/tx dma buffer & descriptors */
        err = atl1c_setup_ring_resources(adapter);
        if (unlikely(err))
                return err;

        err = atl1c_up(adapter);
        if (unlikely(err))
                goto err_up;

        if (adapter->hw.ctrl_flags & ATL1C_FPGA_VERSION) {
                u32 phy_data;

                AT_READ_REG(&adapter->hw, REG_MDIO_CTRL, &phy_data);
                phy_data |= MDIO_AP_EN;
                AT_WRITE_REG(&adapter->hw, REG_MDIO_CTRL, phy_data);
        }
        return 0;

err_up:
        atl1c_free_irq(adapter);
        atl1c_free_ring_resources(adapter);
        atl1c_reset_mac(&adapter->hw);
        return err;
}

/*
 * atl1c_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled.  A global MAC reset is issued to stop the
 * hardware, and all transmit and receive resources are freed.
 */
static int atl1c_close(struct net_device *netdev)
{
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
        atl1c_down(adapter);
        atl1c_free_ring_resources(adapter);
        return 0;
}

static int atl1c_suspend(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1c_adapter *adapter = netdev_priv(netdev);
        struct atl1c_hw *hw = &adapter->hw;
        u32 mac_ctrl_data = 0;
        u32 master_ctrl_data = 0;
        u32 wol_ctrl_data = 0;
        u16 mii_intr_status_data = 0;
        u32 wufc = adapter->wol;

        atl1c_disable_l0s_l1(hw);
        if (netif_running(netdev)) {
                WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
                atl1c_down(adapter);
        }
        netif_device_detach(netdev);

        if (wufc)
                if (atl1c_phy_power_saving(hw) != 0)
                        dev_dbg(&pdev->dev, "phy power saving failed");

        AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
        AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);

        master_ctrl_data &= ~MASTER_CTRL_CLK_SEL_DIS;
        mac_ctrl_data &= ~(MAC_CTRL_PRMLEN_MASK << MAC_CTRL_PRMLEN_SHIFT);
        mac_ctrl_data |= (((u32)adapter->hw.preamble_len &
                        MAC_CTRL_PRMLEN_MASK) <<
                        MAC_CTRL_PRMLEN_SHIFT);
        mac_ctrl_data &= ~(MAC_CTRL_SPEED_MASK << MAC_CTRL_SPEED_SHIFT);
        mac_ctrl_data &= ~MAC_CTRL_DUPLX;

        if (wufc) {
                mac_ctrl_data |= MAC_CTRL_RX_EN;
                if (adapter->link_speed == SPEED_1000 ||
                        adapter->link_speed == SPEED_0) {
                        mac_ctrl_data |= atl1c_mac_speed_1000 <<
                                        MAC_CTRL_SPEED_SHIFT;
                        mac_ctrl_data |= MAC_CTRL_DUPLX;
                } else
                        mac_ctrl_data |= atl1c_mac_speed_10_100 <<
                                        MAC_CTRL_SPEED_SHIFT;

                if (adapter->link_duplex == DUPLEX_FULL)
                        mac_ctrl_data |= MAC_CTRL_DUPLX;

                /* turn on magic packet wol */
                if (wufc & AT_WUFC_MAG)
                        wol_ctrl_data |= WOL_MAGIC_EN | WOL_MAGIC_PME_EN;

                if (wufc & AT_WUFC_LNKC) {
                        wol_ctrl_data |=  WOL_LINK_CHG_EN | WOL_LINK_CHG_PME_EN;
                        /* only link up can wake up */
                        if (atl1c_write_phy_reg(hw, MII_IER, IER_LINK_UP) != 0) {
                                dev_dbg(&pdev->dev, "%s: read write phy "
                                                  "register failed.\n",
                                                  atl1c_driver_name);
                        }
                }
                /* clear phy interrupt */
                atl1c_read_phy_reg(hw, MII_ISR, &mii_intr_status_data);
                /* Config MAC Ctrl register */
                __atl1c_vlan_mode(netdev->features, &mac_ctrl_data);

                /* magic packet maybe Broadcast&multicast&Unicast frame */
                if (wufc & AT_WUFC_MAG)
                        mac_ctrl_data |= MAC_CTRL_BC_EN;

                dev_dbg(&pdev->dev,
                        "%s: suspend MAC=0x%x\n",
                        atl1c_driver_name, mac_ctrl_data);
                AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
                AT_WRITE_REG(hw, REG_WOL_CTRL, wol_ctrl_data);
                AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);

                AT_WRITE_REG(hw, REG_GPHY_CTRL, GPHY_CTRL_DEFAULT |
                        GPHY_CTRL_EXT_RESET);
        } else {
                AT_WRITE_REG(hw, REG_GPHY_CTRL, GPHY_CTRL_POWER_SAVING);
                master_ctrl_data |= MASTER_CTRL_CLK_SEL_DIS;
                mac_ctrl_data |= atl1c_mac_speed_10_100 << MAC_CTRL_SPEED_SHIFT;
                mac_ctrl_data |= MAC_CTRL_DUPLX;
                AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
                AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
                AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
                hw->phy_configured = false; /* re-init PHY when resume */
        }

        return 0;
}

#ifdef CONFIG_PM_SLEEP
static int atl1c_resume(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);
        atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE |
                        ATL1C_PCIE_PHY_RESET);

        atl1c_phy_reset(&adapter->hw);
        atl1c_reset_mac(&adapter->hw);
        atl1c_phy_init(&adapter->hw);

#if 0
        AT_READ_REG(&adapter->hw, REG_PM_CTRLSTAT, &pm_data);
        pm_data &= ~PM_CTRLSTAT_PME_EN;
        AT_WRITE_REG(&adapter->hw, REG_PM_CTRLSTAT, pm_data);
#endif

        netif_device_attach(netdev);
        if (netif_running(netdev))
                atl1c_up(adapter);

        return 0;
}
#endif

static void atl1c_shutdown(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        atl1c_suspend(&pdev->dev);
        pci_wake_from_d3(pdev, adapter->wol);
        pci_set_power_state(pdev, PCI_D3hot);
}

static const struct net_device_ops atl1c_netdev_ops = {
        .ndo_open               = atl1c_open,
        .ndo_stop               = atl1c_close,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_start_xmit         = atl1c_xmit_frame,
        .ndo_set_mac_address    = atl1c_set_mac_addr,
        .ndo_set_rx_mode        = atl1c_set_multi,
        .ndo_change_mtu         = atl1c_change_mtu,
        .ndo_fix_features       = atl1c_fix_features,
        .ndo_set_features       = atl1c_set_features,
        .ndo_do_ioctl           = atl1c_ioctl,
        .ndo_tx_timeout         = atl1c_tx_timeout,
        .ndo_get_stats          = atl1c_get_stats,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = atl1c_netpoll,
#endif
};

static int atl1c_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
{
        SET_NETDEV_DEV(netdev, &pdev->dev);
        pci_set_drvdata(pdev, netdev);

        netdev->irq  = pdev->irq;
        netdev->netdev_ops = &atl1c_netdev_ops;
        netdev->watchdog_timeo = AT_TX_WATCHDOG;
        atl1c_set_ethtool_ops(netdev);

        /* TODO: add when ready */
        netdev->hw_features =   NETIF_F_SG         |
                                NETIF_F_HW_CSUM    |
                                NETIF_F_HW_VLAN_RX |
                                NETIF_F_TSO        |
                                NETIF_F_TSO6;
        netdev->features =      netdev->hw_features |
                                NETIF_F_HW_VLAN_TX;
        return 0;
}

/*
 * atl1c_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in atl1c_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * atl1c_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 */
static int __devinit atl1c_probe(struct pci_dev *pdev,
                                 const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct atl1c_adapter *adapter;
        static int cards_found;

        int err = 0;

        /* enable device (incl. PCI PM wakeup and hotplug setup) */
        err = pci_enable_device_mem(pdev);
        if (err) {
                dev_err(&pdev->dev, "cannot enable PCI device\n");
                return err;
        }

        /*
         * The atl1c chip can DMA to 64-bit addresses, but it uses a single
         * shared register for the high 32 bits, so only a single, aligned,
         * 4 GB physical address range can be used at a time.
         *
         * Supporting 64-bit DMA on this hardware is more trouble than it's
         * worth.  It is far easier to limit to 32-bit DMA than update
         * various kernel subsystems to support the mechanics required by a
         * fixed-high-32-bit system.
         */
        if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) ||
            (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)) {
                dev_err(&pdev->dev, "No usable DMA configuration,aborting\n");
                goto err_dma;
        }

        err = pci_request_regions(pdev, atl1c_driver_name);
        if (err) {
                dev_err(&pdev->dev, "cannot obtain PCI resources\n");
                goto err_pci_reg;
        }

        pci_set_master(pdev);

        netdev = alloc_etherdev(sizeof(struct atl1c_adapter));
        if (netdev == NULL) {
                err = -ENOMEM;
                goto err_alloc_etherdev;
        }

        err = atl1c_init_netdev(netdev, pdev);
        if (err) {
                dev_err(&pdev->dev, "init netdevice failed\n");
                goto err_init_netdev;
        }
        adapter = netdev_priv(netdev);
        adapter->bd_number = cards_found;
        adapter->netdev = netdev;
        adapter->pdev = pdev;
        adapter->hw.adapter = adapter;
        adapter->msg_enable = netif_msg_init(-1, atl1c_default_msg);
        adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
        if (!adapter->hw.hw_addr) {
                err = -EIO;
                dev_err(&pdev->dev, "cannot map device registers\n");
                goto err_ioremap;
        }
        netdev->base_addr = (unsigned long)adapter->hw.hw_addr;

        /* init mii data */
        adapter->mii.dev = netdev;
        adapter->mii.mdio_read  = atl1c_mdio_read;
        adapter->mii.mdio_write = atl1c_mdio_write;
        adapter->mii.phy_id_mask = 0x1f;
        adapter->mii.reg_num_mask = MDIO_REG_ADDR_MASK;
        netif_napi_add(netdev, &adapter->napi, atl1c_clean, 64);
        setup_timer(&adapter->phy_config_timer, atl1c_phy_config,
                        (unsigned long)adapter);
        /* setup the private structure */
        err = atl1c_sw_init(adapter);
        if (err) {
                dev_err(&pdev->dev, "net device private data init failed\n");
                goto err_sw_init;
        }
        atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE |
                        ATL1C_PCIE_PHY_RESET);

        /* Init GPHY as early as possible due to power saving issue  */
        atl1c_phy_reset(&adapter->hw);

        err = atl1c_reset_mac(&adapter->hw);
        if (err) {
                err = -EIO;
                goto err_reset;
        }

        /* reset the controller to
         * put the device in a known good starting state */
        err = atl1c_phy_init(&adapter->hw);
        if (err) {
                err = -EIO;
                goto err_reset;
        }
        if (atl1c_read_mac_addr(&adapter->hw)) {
                /* got a random MAC address, set NET_ADDR_RANDOM to netdev */
                netdev->addr_assign_type |= NET_ADDR_RANDOM;
        }
        memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);
        memcpy(netdev->perm_addr, adapter->hw.mac_addr, netdev->addr_len);
        if (netif_msg_probe(adapter))
                dev_dbg(&pdev->dev, "mac address : %pM\n",
                        adapter->hw.mac_addr);

        atl1c_hw_set_mac_addr(&adapter->hw);
        INIT_WORK(&adapter->common_task, atl1c_common_task);
        adapter->work_event = 0;
        err = register_netdev(netdev);
        if (err) {
                dev_err(&pdev->dev, "register netdevice failed\n");
                goto err_register;
        }

        if (netif_msg_probe(adapter))
                dev_info(&pdev->dev, "version %s\n", ATL1C_DRV_VERSION);
        cards_found++;
        return 0;

err_reset:
err_register:
err_sw_init:
        iounmap(adapter->hw.hw_addr);
err_init_netdev:
err_ioremap:
        free_netdev(netdev);
err_alloc_etherdev:
        pci_release_regions(pdev);
err_pci_reg:
err_dma:
        pci_disable_device(pdev);
        return err;
}

/*
 * atl1c_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * atl1c_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 */
static void __devexit atl1c_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        unregister_netdev(netdev);
        atl1c_phy_disable(&adapter->hw);

        iounmap(adapter->hw.hw_addr);

        pci_release_regions(pdev);
        pci_disable_device(pdev);
        free_netdev(netdev);
}

/*
 * atl1c_io_error_detected - called when PCI error is detected
 * @pdev: Pointer to PCI device
 * @state: The current pci connection state
 *
 * This function is called after a PCI bus error affecting
 * this device has been detected.
 */
static pci_ers_result_t atl1c_io_error_detected(struct pci_dev *pdev,
                                                pci_channel_state_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        netif_device_detach(netdev);

        if (state == pci_channel_io_perm_failure)
                return PCI_ERS_RESULT_DISCONNECT;

        if (netif_running(netdev))
                atl1c_down(adapter);

        pci_disable_device(pdev);

        /* Request a slot slot reset. */
        return PCI_ERS_RESULT_NEED_RESET;
}

/*
 * atl1c_io_slot_reset - called after the pci bus has been reset.
 * @pdev: Pointer to PCI device
 *
 * Restart the card from scratch, as if from a cold-boot. Implementation
 * resembles the first-half of the e1000_resume routine.
 */
static pci_ers_result_t atl1c_io_slot_reset(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        if (pci_enable_device(pdev)) {
                if (netif_msg_hw(adapter))
                        dev_err(&pdev->dev,
                                "Cannot re-enable PCI device after reset\n");
                return PCI_ERS_RESULT_DISCONNECT;
        }
        pci_set_master(pdev);

        pci_enable_wake(pdev, PCI_D3hot, 0);
        pci_enable_wake(pdev, PCI_D3cold, 0);

        atl1c_reset_mac(&adapter->hw);

        return PCI_ERS_RESULT_RECOVERED;
}

/*
 * atl1c_io_resume - called when traffic can start flowing again.
 * @pdev: Pointer to PCI device
 *
 * This callback is called when the error recovery driver tells us that
 * its OK to resume normal operation. Implementation resembles the
 * second-half of the atl1c_resume routine.
 */
static void atl1c_io_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1c_adapter *adapter = netdev_priv(netdev);

        if (netif_running(netdev)) {
                if (atl1c_up(adapter)) {
                        if (netif_msg_hw(adapter))
                                dev_err(&pdev->dev,
                                        "Cannot bring device back up after reset\n");
                        return;
                }
        }

        netif_device_attach(netdev);
}

static struct pci_error_handlers atl1c_err_handler = {
        .error_detected = atl1c_io_error_detected,
        .slot_reset = atl1c_io_slot_reset,
        .resume = atl1c_io_resume,
};

static SIMPLE_DEV_PM_OPS(atl1c_pm_ops, atl1c_suspend, atl1c_resume);

static struct pci_driver atl1c_driver = {
        .name     = atl1c_driver_name,
        .id_table = atl1c_pci_tbl,
        .probe    = atl1c_probe,
        .remove   = __devexit_p(atl1c_remove),
        .shutdown = atl1c_shutdown,
        .err_handler = &atl1c_err_handler,
        .driver.pm = &atl1c_pm_ops,
};

/*
 * atl1c_init_module - Driver Registration Routine
 *
 * atl1c_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 */
static int __init atl1c_init_module(void)
{
        return pci_register_driver(&atl1c_driver);
}

/*
 * atl1c_exit_module - Driver Exit Cleanup Routine
 *
 * atl1c_exit_module is called just before the driver is removed
 * from memory.
 */
static void __exit atl1c_exit_module(void)
{
        pci_unregister_driver(&atl1c_driver);
}

module_init(atl1c_init_module);
module_exit(atl1c_exit_module);