text: /*
   * 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;
  
  /*
   * 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");
  MODULE_AUTHOR("Qualcomm Atheros Inc., <nic-devel@qualcomm.com>");
  MODULE_DESCRIPTION("Qualcom Atheros 100/1000M Ethernet Network Driver");
  MODULE_LICENSE("GPL");
  MODULE_VERSION(ATL1C_DRV_VERSION);
  
  static int atl1c_stop_mac(struct atl1c_hw *hw);
  static void atl1c_disable_l0s_l1(struct atl1c_hw *hw);
  static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed);
  static void atl1c_start_mac(struct atl1c_adapter *adapter);
  static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
  		   int *work_done, int work_to_do);
  static int atl1c_up(struct atl1c_adapter *adapter);
  static void atl1c_down(struct atl1c_adapter *adapter);
  static int atl1c_reset_mac(struct atl1c_hw *hw);
  static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter);
  static int atl1c_configure(struct atl1c_adapter *adapter);
  static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter);
  
  static const u16 atl1c_pay_load_size[] = {
  	128, 256, 512, 1024, 2048, 4096,
  };
  
  
  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 mst_data, data;
  
  	/* pclk sel could switch to 25M */
  	AT_READ_REG(hw, REG_MASTER_CTRL, &mst_data);
  	mst_data &= ~MASTER_CTRL_CLK_SEL_DIS;
  	AT_WRITE_REG(hw, REG_MASTER_CTRL, mst_data);
  
  	/* WoL/PCIE related settings */
  	if (hw->nic_type == athr_l1c || hw->nic_type == athr_l2c) {
  		AT_READ_REG(hw, REG_PCIE_PHYMISC, &data);
  		data |= PCIE_PHYMISC_FORCE_RCV_DET;
  		AT_WRITE_REG(hw, REG_PCIE_PHYMISC, data);
  	} else { /* new dev set bit5 of MASTER */
  		if (!(mst_data & MASTER_CTRL_WAKEN_25M))
  			AT_WRITE_REG(hw, REG_MASTER_CTRL,
  				mst_data | MASTER_CTRL_WAKEN_25M);
  	}
  	/* aspm/PCIE setting only for l2cb 1.0 */
  	if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10) {
  		AT_READ_REG(hw, REG_PCIE_PHYMISC2, &data);
  		data = FIELD_SETX(data, PCIE_PHYMISC2_CDR_BW,
  			L2CB1_PCIE_PHYMISC2_CDR_BW);
  		data = FIELD_SETX(data, PCIE_PHYMISC2_L0S_TH,
  			L2CB1_PCIE_PHYMISC2_L0S_TH);
  		AT_WRITE_REG(hw, REG_PCIE_PHYMISC2, data);
  		/* extend L1 sync timer */
  		AT_READ_REG(hw, REG_LINK_CTRL, &data);
  		data |= LINK_CTRL_EXT_SYNC;
  		AT_WRITE_REG(hw, REG_LINK_CTRL, data);
  	}
  	/* l2cb 1.x & l1d 1.x */
  	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d) {
  		AT_READ_REG(hw, REG_PM_CTRL, &data);
  		data |= PM_CTRL_L0S_BUFSRX_EN;
  		AT_WRITE_REG(hw, REG_PM_CTRL, data);
  		/* clear vendor msg */
  		AT_READ_REG(hw, REG_DMA_DBG, &data);
  		AT_WRITE_REG(hw, REG_DMA_DBG, data & ~DMA_DBG_VENDOR_MSG);
  	}
  }
  
  /* 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;
  	int pos;
  
  	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);
  	/* wol sts read-clear */
  	AT_READ_REG(hw, REG_WOL_CTRL, &data);
  	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
  
  	/*
  	 * Mask some pcie error bits
  	 */
  	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
  	pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
  	data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
  	pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
  	/* clear error status */
  	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
  			PCI_EXP_DEVSTA_NFED |
  			PCI_EXP_DEVSTA_FED |
  			PCI_EXP_DEVSTA_CED |
  			PCI_EXP_DEVSTA_URD);
  
  	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);
  
  	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, u32 modu_ctrl)
  {
  	int timeout;
  	u32 data;
  
  	for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
  		AT_READ_REG(hw, REG_IDLE_STATUS, &data);
  		if ((data & modu_ctrl) == 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 */
  		netif_carrier_off(netdev);
  		hw->hibernate = true;
  		if (atl1c_reset_mac(hw) != 0)
  			if (netif_msg_hw(adapter))
  				dev_warn(&pdev->dev, "reset mac failed\n");
  		atl1c_set_aspm(hw, SPEED_0);
  		atl1c_post_phy_linkchg(hw, SPEED_0);
  		atl1c_reset_dma_ring(adapter);
  		atl1c_configure(adapter);
  	} 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, speed);
  			atl1c_post_phy_linkchg(hw, speed);
  			atl1c_start_mac(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_bit(__AT_DOWN, &adapter->flags))
  		return;
  
  	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_irq_disable(adapter);
  		atl1c_check_link_status(adapter);
  		atl1c_irq_enable(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, adapter->hw.mac_addr);
  
  	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);
  	struct atl1c_hw *hw = &adapter->hw;
  	int old_mtu   = netdev->mtu;
  	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
  
  	/* Fast Ethernet controller doesn't support jumbo packet */
  	if (((hw->nic_type == athr_l2c ||
  	      hw->nic_type == athr_l2c_b ||
  	      hw->nic_type == athr_l2c_b2) && new_mtu > ETH_DATA_LEN) ||
  	      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);
  	}
  	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, &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, val);
  }
  
  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;
  }
  
  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 link_ctrl_data;
  
  	atl1c_set_mac_type(hw);
  	AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);
  
  	hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
  			 ATL1C_TXQ_MODE_ENHANCE;
  	hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT |
  			  ATL1C_ASPM_L1_SUPPORT;
  	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;
  }
  
  struct atl1c_platform_patch {
  	u16 pci_did;
  	u8  pci_revid;
  	u16 subsystem_vid;
  	u16 subsystem_did;
  	u32 patch_flag;
  #define ATL1C_LINK_PATCH	0x1
  };
  static const struct atl1c_platform_patch plats[] __devinitconst = {
  {0x2060, 0xC1, 0x1019, 0x8152, 0x1},
  {0x2060, 0xC1, 0x1019, 0x2060, 0x1},
  {0x2060, 0xC1, 0x1019, 0xE000, 0x1},
  {0x2062, 0xC0, 0x1019, 0x8152, 0x1},
  {0x2062, 0xC0, 0x1019, 0x2062, 0x1},
  {0x2062, 0xC0, 0x1458, 0xE000, 0x1},
  {0x2062, 0xC1, 0x1019, 0x8152, 0x1},
  {0x2062, 0xC1, 0x1019, 0x2062, 0x1},
  {0x2062, 0xC1, 0x1458, 0xE000, 0x1},
  {0x2062, 0xC1, 0x1565, 0x2802, 0x1},
  {0x2062, 0xC1, 0x1565, 0x2801, 0x1},
  {0x1073, 0xC0, 0x1019, 0x8151, 0x1},
  {0x1073, 0xC0, 0x1019, 0x1073, 0x1},
  {0x1073, 0xC0, 0x1458, 0xE000, 0x1},
  {0x1083, 0xC0, 0x1458, 0xE000, 0x1},
  {0x1083, 0xC0, 0x1019, 0x8151, 0x1},
  {0x1083, 0xC0, 0x1019, 0x1083, 0x1},
  {0x1083, 0xC0, 0x1462, 0x7680, 0x1},
  {0x1083, 0xC0, 0x1565, 0x2803, 0x1},
  {0},
  };
  
  static void __devinit atl1c_patch_assign(struct atl1c_hw *hw)
  {
  	struct pci_dev	*pdev = hw->adapter->pdev;
  	u32 misc_ctrl;
  	int i = 0;
  
  	hw->msi_lnkpatch = false;
  
  	while (plats[i].pci_did != 0) {
  		if (plats[i].pci_did == hw->device_id &&
  		    plats[i].pci_revid == hw->revision_id &&
  		    plats[i].subsystem_vid == hw->subsystem_vendor_id &&
  		    plats[i].subsystem_did == hw->subsystem_id) {
  			if (plats[i].patch_flag & ATL1C_LINK_PATCH)
  				hw->msi_lnkpatch = true;
  		}
  		i++;
  	}
  
  	if (hw->device_id == PCI_DEVICE_ID_ATHEROS_L2C_B2 &&
  	    hw->revision_id == L2CB_V21) {
  		/* config acess mode */
  		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
  				       REG_PCIE_DEV_MISC_CTRL);
  		pci_read_config_dword(pdev, REG_PCIE_IND_ACC_DATA, &misc_ctrl);
  		misc_ctrl &= ~0x100;
  		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
  				       REG_PCIE_DEV_MISC_CTRL);
  		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_DATA, misc_ctrl);
  	}
  }
  /**
   * 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->tpd_ring[0].count = 1024;
  	adapter->rfd_ring.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;
  	pci_read_config_dword(pdev, 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;
  	}
  	atl1c_patch_assign(hw);
  
  	hw->intr_mask = IMR_NORMAL_MASK;
  	hw->phy_configured = false;
  	hw->preamble_len = 7;
  	hw->max_frame_size = adapter->netdev->mtu;
  	hw->autoneg_advertised = ADVERTISED_Autoneg;
  	hw->indirect_tab = 0xE4E4E4E4;
  	hw->base_cpu = 0;
  
  	hw->ict = 50000;		/* 100ms */
  	hw->smb_timer = 200000;	  	/* 400ms */
  	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;
  
  	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 j;
  
  	for (j = 0; j < rfd_ring->count; j++) {
  		buffer_info = &rfd_ring->buffer_info[j];
  		atl1c_clean_buffer(pdev, buffer_info, 0);
  	}
  	/* zero out the descriptor ring */
  	memset(rfd_ring->desc, 0, rfd_ring->size);
  	rfd_ring->next_to_clean = 0;
  	rfd_ring->next_to_use = 0;
  	rrd_ring->next_to_use = 0;
  	rrd_ring->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);
  	}
  	rfd_ring->next_to_use = 0;
  	rfd_ring->next_to_clean = 0;
  	rrd_ring->next_to_use = 0;
  	rrd_ring->next_to_clean = 0;
  	for (j = 0; j < rfd_ring->count; j++) {
  		buffer_info = &rfd_ring->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 size;
  	int i;
  	int count = 0;
  	int rx_desc_count = 0;
  	u32 offset = 0;
  
  	rrd_ring->count = rfd_ring->count;
  	for (i = 1; i < AT_MAX_TRANSMIT_QUEUE; i++)
  		tpd_ring[i].count = tpd_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);
  	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 =
  			(tpd_ring->buffer_info + count);
  		count += tpd_ring[i].count;
  	}
  
  	rfd_ring->buffer_info =
  		(tpd_ring->buffer_info + count);
  	count += rfd_ring->count;
  	rx_desc_count += rfd_ring->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 +
  		8 * 4;
  
  	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 */
  	rfd_ring->dma = ring_header->dma + offset;
  	rfd_ring->desc = (u8 *) ring_header->desc + offset;
  	rfd_ring->size = sizeof(struct atl1c_rx_free_desc) * rfd_ring->count;
  	offset += roundup(rfd_ring->size, 8);
  
  	/* init RRD ring */
  	rrd_ring->dma = ring_header->dma + offset;
  	rrd_ring->desc = (u8 *) ring_header->desc + offset;
  	rrd_ring->size = sizeof(struct atl1c_recv_ret_status) *
  		rrd_ring->count;
  	offset += roundup(rrd_ring->size, 8);
  
  	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 = &adapter->rfd_ring;
  	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
  	struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
  				adapter->tpd_ring;
  
  	/* 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_TPD_PRI0_ADDR_LO,
  			(u32)(tpd_ring[atl1c_trans_normal].dma &
  				AT_DMA_LO_ADDR_MASK));
  	AT_WRITE_REG(hw, REG_TPD_PRI1_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->dma & AT_DMA_HI_ADDR_MASK) >> 32));
  	AT_WRITE_REG(hw, REG_RFD0_HEAD_ADDR_LO,
  			(u32)(rfd_ring->dma & AT_DMA_LO_ADDR_MASK));
  
  	AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
  			rfd_ring->count & RFD_RING_SIZE_MASK);
  	AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
  			adapter->rx_buffer_len & RX_BUF_SIZE_MASK);
  
  	/* RRD */
  	AT_WRITE_REG(hw, REG_RRD0_HEAD_ADDR_LO,
  			(u32)(rrd_ring->dma & AT_DMA_LO_ADDR_MASK));
  	AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
  			(rrd_ring->count & RRD_RING_SIZE_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.*/
  	}
  	/* 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;
  	int max_pay_load;
  	u16 tx_offload_thresh;
  	u32 txq_ctrl_data;
  
  	tx_offload_thresh = MAX_TSO_FRAME_SIZE;
  	AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
  		(tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
  	max_pay_load = pcie_get_readrq(adapter->pdev) >> 8;
  	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
  	/*
  	 * if BIOS had changed the dam-read-max-length to an invalid value,
  	 * restore it to default value
  	 */
  	if (hw->dmar_block < DEVICE_CTRL_MAXRRS_MIN) {
  		pcie_set_readrq(adapter->pdev, 128 << DEVICE_CTRL_MAXRRS_MIN);
  		hw->dmar_block = DEVICE_CTRL_MAXRRS_MIN;
  	}
  	txq_ctrl_data =
  		hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2 ?
  		L2CB_TXQ_CFGV : L1C_TXQ_CFGV;
  
  	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;
  
  	/* aspm for gigabit */
  	if (hw->nic_type != athr_l1d_2 && (hw->device_id & 1) != 0)
  		rxq_ctrl_data = FIELD_SETX(rxq_ctrl_data, ASPM_THRUPUT_LIMIT,
  			ASPM_THRUPUT_LIMIT_100M);
  
  	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
  }
  
  static void atl1c_configure_dma(struct atl1c_adapter *adapter)
  {
  	struct atl1c_hw *hw = &adapter->hw;
  	u32 dma_ctrl_data;
  
  	dma_ctrl_data = FIELDX(DMA_CTRL_RORDER_MODE, DMA_CTRL_RORDER_MODE_OUT) |
  		DMA_CTRL_RREQ_PRI_DATA |
  		FIELDX(DMA_CTRL_RREQ_BLEN, hw->dmar_block) |
  		FIELDX(DMA_CTRL_WDLY_CNT, DMA_CTRL_WDLY_CNT_DEF) |
  		FIELDX(DMA_CTRL_RDLY_CNT, DMA_CTRL_RDLY_CNT_DEF);
  
  	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 &= ~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_TXQ_CTRL, data);
  
  	atl1c_wait_until_idle(hw, IDLE_STATUS_RXQ_BUSY | IDLE_STATUS_TXQ_BUSY);
  
  	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,
  		IDLE_STATUS_TXMAC_BUSY | IDLE_STATUS_RXMAC_BUSY);
  }
  
  static void atl1c_start_mac(struct atl1c_adapter *adapter)
  {
  	struct atl1c_hw *hw = &adapter->hw;
  	u32 mac, txq, rxq;
  
  	hw->mac_duplex = adapter->link_duplex == FULL_DUPLEX ? true : false;
  	hw->mac_speed = adapter->link_speed == SPEED_1000 ?
  		atl1c_mac_speed_1000 : atl1c_mac_speed_10_100;
  
  	AT_READ_REG(hw, REG_TXQ_CTRL, &txq);
  	AT_READ_REG(hw, REG_RXQ_CTRL, &rxq);
  	AT_READ_REG(hw, REG_MAC_CTRL, &mac);
  
  	txq |= TXQ_CTRL_EN;
  	rxq |= RXQ_CTRL_EN;
  	mac |= MAC_CTRL_TX_EN | MAC_CTRL_TX_FLOW |
  	       MAC_CTRL_RX_EN | MAC_CTRL_RX_FLOW |
  	       MAC_CTRL_ADD_CRC | MAC_CTRL_PAD |
  	       MAC_CTRL_BC_EN | MAC_CTRL_SINGLE_PAUSE_EN |
  	       MAC_CTRL_HASH_ALG_CRC32;
  	if (hw->mac_duplex)
  		mac |= MAC_CTRL_DUPLX;
  	else
  		mac &= ~MAC_CTRL_DUPLX;
  	mac = FIELD_SETX(mac, MAC_CTRL_SPEED, hw->mac_speed);
  	mac = FIELD_SETX(mac, MAC_CTRL_PRMLEN, hw->preamble_len);
  
  	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq);
  	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq);
  	AT_WRITE_REG(hw, REG_MAC_CTRL, mac);
  }
  
  /*
   * 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 = hw->adapter;
  	struct pci_dev *pdev = adapter->pdev;
  	u32 ctrl_data = 0;
  
  	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, &ctrl_data);
  	ctrl_data |= MASTER_CTRL_OOB_DIS;
  	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data | MASTER_CTRL_SOFT_RST);
  
  	AT_WRITE_FLUSH(hw);
  	msleep(10);
  	/* Wait at least 10ms for All module to be Idle */
  
  	if (atl1c_wait_until_idle(hw, IDLE_STATUS_MASK)) {
  		dev_err(&pdev->dev,
  			"MAC state machine can't be idle since"
  			" disabled for 10ms second\n");
  		return -1;
  	}
  	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data);
  
  	/* driver control speed/duplex */
  	AT_READ_REG(hw, REG_MAC_CTRL, &ctrl_data);
  	AT_WRITE_REG(hw, REG_MAC_CTRL, ctrl_data | MAC_CTRL_SPEED_MODE_SW);
  
  	/* clk switch setting */
  	AT_READ_REG(hw, REG_SERDES, &ctrl_data);
  	switch (hw->nic_type) {
  	case athr_l2c_b:
  		ctrl_data &= ~(SERDES_PHY_CLK_SLOWDOWN |
  				SERDES_MAC_CLK_SLOWDOWN);
  		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
  		break;
  	case athr_l2c_b2:
  	case athr_l1d_2:
  		ctrl_data |= SERDES_PHY_CLK_SLOWDOWN | SERDES_MAC_CLK_SLOWDOWN;
  		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
  		break;
  	default:
  		break;
  	}
  
  	return 0;
  }
  
  static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
  {
  	u16 ctrl_flags = hw->ctrl_flags;
  
  	hw->ctrl_flags &= ~(ATL1C_ASPM_L0S_SUPPORT | ATL1C_ASPM_L1_SUPPORT);
  	atl1c_set_aspm(hw, SPEED_0);
  	hw->ctrl_flags = ctrl_flags;
  }
  
  /*
   * Set ASPM state.
   * Enable/disable L0s/L1 depend on link state.
   */
  static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed)
  {
  	u32 pm_ctrl_data;
  	u32 link_l1_timer;
  
  	AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
  	pm_ctrl_data &= ~(PM_CTRL_ASPM_L1_EN |
  			  PM_CTRL_ASPM_L0S_EN |
  			  PM_CTRL_MAC_ASPM_CHK);
  	/* L1 timer */
  	if (hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
  		pm_ctrl_data &= ~PMCTRL_TXL1_AFTER_L0S;
  		link_l1_timer =
  			link_speed == SPEED_1000 || link_speed == SPEED_100 ?
  			L1D_PMCTRL_L1_ENTRY_TM_16US : 1;
  		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
  			L1D_PMCTRL_L1_ENTRY_TM, link_l1_timer);
  	} else {
  		link_l1_timer = hw->nic_type == athr_l2c_b ?
  			L2CB1_PM_CTRL_L1_ENTRY_TM : L1C_PM_CTRL_L1_ENTRY_TM;
  		if (link_speed != SPEED_1000 && link_speed != SPEED_100)
  			link_l1_timer = 1;
  		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
  			PM_CTRL_L1_ENTRY_TIMER, link_l1_timer);
  	}
  
  	/* L0S/L1 enable */
  	if ((hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT) && link_speed != SPEED_0)
  		pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN | PM_CTRL_MAC_ASPM_CHK;
  	if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
  		pm_ctrl_data |= PM_CTRL_ASPM_L1_EN | PM_CTRL_MAC_ASPM_CHK;
  
  	/* l2cb & l1d & l2cb2 & l1d2 */
  	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
  	    hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
  		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
  			PM_CTRL_PM_REQ_TIMER, PM_CTRL_PM_REQ_TO_DEF);
  		pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER |
  				PM_CTRL_SERDES_PD_EX_L1 |
  				PM_CTRL_CLK_SWH_L1;
  		pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
  				  PM_CTRL_SERDES_PLL_L1_EN |
  				  PM_CTRL_SERDES_BUFS_RX_L1_EN |
  				  PM_CTRL_SA_DLY_EN |
  				  PM_CTRL_HOTRST);
  		/* disable l0s if link down or l2cb */
  		if (link_speed == SPEED_0 || hw->nic_type == athr_l2c_b)
  			pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
  	} else { /* l1c */
  		pm_ctrl_data =
  			FIELD_SETX(pm_ctrl_data, PM_CTRL_L1_ENTRY_TIMER, 0);
  		if (link_speed != SPEED_0) {
  			pm_ctrl_data |= PM_CTRL_SERDES_L1_EN |
  					PM_CTRL_SERDES_PLL_L1_EN |
  					PM_CTRL_SERDES_BUFS_RX_L1_EN;
  			pm_ctrl_data &= ~(PM_CTRL_SERDES_PD_EX_L1 |
  					  PM_CTRL_CLK_SWH_L1 |
  					  PM_CTRL_ASPM_L0S_EN |
  					  PM_CTRL_ASPM_L1_EN);
  		} else { /* link down */
  			pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
  			pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
  					  PM_CTRL_SERDES_PLL_L1_EN |
  					  PM_CTRL_SERDES_BUFS_RX_L1_EN |
  					  PM_CTRL_ASPM_L0S_EN);
  		}
  	}
  	AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
  
  	return;
  }
  
  /**
   * 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_mac(struct atl1c_adapter *adapter)
  {
  	struct atl1c_hw *hw = &adapter->hw;
  	u32 master_ctrl_data = 0;
  	u32 intr_modrt_data;
  	u32 data;
  
  	AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
  	master_ctrl_data &= ~(MASTER_CTRL_TX_ITIMER_EN |
  			      MASTER_CTRL_RX_ITIMER_EN |
  			      MASTER_CTRL_INT_RDCLR);
  	/* 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);
  
  	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);
  
  	atl1c_configure_tx(adapter);
  	atl1c_configure_rx(adapter);
  	atl1c_configure_dma(adapter);
  
  	return 0;
  }
  
  static int atl1c_configure(struct atl1c_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int num;
  
  	atl1c_init_ring_ptrs(adapter);
  	atl1c_set_multi(netdev);
  	atl1c_restore_vlan(adapter);
  
  	num = atl1c_alloc_rx_buffer(adapter);
  	if (unlikely(num == 0))
  		return -ENOMEM;
  
  	if (atl1c_configure_mac(adapter))
  		return -EIO;
  
  	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 = &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 reg;
  
  	reg = type == atl1c_trans_high ? REG_TPD_PRI1_CIDX : REG_TPD_PRI0_CIDX;
  
  	AT_READ_REGW(&adapter->hw, reg, &hw_next_to_clean);
  
  	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
   */
  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)
  {
  	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
  	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, REG_MB_RFD0_PROD_IDX,
  			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,
  		   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;
  	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
  	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);
  }
  
  /**
   * atl1c_clean - NAPI Rx polling callback
   */
  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, &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];
  	u16 reg;
  
  	reg = type == atl1c_trans_high ? REG_TPD_PRI1_PIDX : REG_TPD_PRI0_PIDX;
  	AT_WRITE_REGW(&adapter->hw, reg, tpd_ring->next_to_use);
  }
  
  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;
  	}
  
  	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 void atl1c_reset_dma_ring(struct atl1c_adapter *adapter)
  {
  	/* release tx-pending skbs and reset tx/rx ring index */
  	atl1c_clean_tx_ring(adapter, atl1c_trans_normal);
  	atl1c_clean_tx_ring(adapter, atl1c_trans_high);
  	atl1c_clean_rx_ring(adapter);
  }
  
  static int atl1c_up(struct atl1c_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int err;
  
  	netif_carrier_off(netdev);
  
  	err = atl1c_configure(adapter);
  	if (unlikely(err))
  		goto err_up;
  
  	err = atl1c_request_irq(adapter);
  	if (unlikely(err))
  		goto err_up;
  
  	atl1c_check_link_status(adapter);
  	clear_bit(__AT_DOWN, &adapter->flags);
  	napi_enable(&adapter->napi);
  	atl1c_irq_enable(adapter);
  	netif_start_queue(netdev);
  	return err;
  
  err_up:
  	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);
  	/* disable ASPM if device inactive */
  	atl1c_disable_l0s_l1(&adapter->hw);
  	/* reset MAC to disable all RX/TX */
  	atl1c_reset_mac(&adapter->hw);
  	msleep(1);
  
  	adapter->link_speed = SPEED_0;
  	adapter->link_duplex = -1;
  	atl1c_reset_dma_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;
  
  	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));
  	set_bit(__AT_DOWN, &adapter->flags);
  	cancel_work_sync(&adapter->common_task);
  	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 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_to_ps_link(hw) != 0)
  			dev_dbg(&pdev->dev, "phy power saving failed");
  
  	atl1c_power_saving(hw, wufc);
  
  	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_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->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;
  	}
  
  	/* 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_CTRL_REG_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);
  
  	/* 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, adapter->hw.mac_addr);
  	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);
  	/* restore permanent address */
  	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.perm_mac_addr);
  	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 const 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);
  