[safe/jmp/linux-2.6] / drivers / net / atl1 / atl1_main.c

/*
 * Copyright(c) 2005 - 2006 Attansic Corporation. All rights reserved.
 * Copyright(c) 2006 Chris Snook <csnook@redhat.com>
 * Copyright(c) 2006 Jay Cliburn <jcliburn@gmail.com>
 *
 * 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.
 *
 * The full GNU General Public License is included in this distribution in the
 * file called COPYING.
 *
 * Contact Information:
 * Xiong Huang <xiong_huang@attansic.com>
 * Attansic Technology Corp. 3F 147, Xianzheng 9th Road, Zhubei,
 * Xinzhu  302, TAIWAN, REPUBLIC OF CHINA
 *
 * Chris Snook <csnook@redhat.com>
 * Jay Cliburn <jcliburn@gmail.com>
 *
 * This version is adapted from the Attansic reference driver for
 * inclusion in the Linux kernel.  It is currently under heavy development.
 * A very incomplete list of things that need to be dealt with:
 *
 * TODO:
 * Fix TSO; tx performance is horrible with TSO enabled.
 * Wake on LAN.
 * Add more ethtool functions, including set ring parameters.
 * Fix abstruse irq enable/disable condition described here:
 *      http://marc.theaimsgroup.com/?l=linux-netdev&m=116398508500553&w=2
 *
 * NEEDS TESTING:
 * VLAN
 * multicast
 * promiscuous mode
 * interrupt coalescing
 * SMP torture testing
 */

#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
#include <linux/irqreturn.h>
#include <linux/workqueue.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/irqflags.h>
#include <linux/dma-mapping.h>
#include <linux/net.h>
#include <linux/pm.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/mii.h>
#include <net/checksum.h>

#include <asm/atomic.h>
#include <asm/byteorder.h>

#include "atl1.h"

#define DRIVER_VERSION "2.0.7"

char atl1_driver_name[] = "atl1";
static const char atl1_driver_string[] = "Attansic L1 Ethernet Network Driver";
static const char atl1_copyright[] = "Copyright(c) 2005-2006 Attansic Corporation.";
char atl1_driver_version[] = DRIVER_VERSION;

MODULE_AUTHOR
    ("Attansic Corporation <xiong_huang@attansic.com>, Chris Snook <csnook@redhat.com>, Jay Cliburn <jcliburn@gmail.com>");
MODULE_DESCRIPTION("Attansic 1000M Ethernet Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);

/*
 * atl1_pci_tbl - PCI Device ID Table
 */
static const struct pci_device_id atl1_pci_tbl[] = {
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1)},
        /* required last entry */
        {0,}
};

MODULE_DEVICE_TABLE(pci, atl1_pci_tbl);

/*
 * atl1_sw_init - Initialize general software structures (struct atl1_adapter)
 * @adapter: board private structure to initialize
 *
 * atl1_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 atl1_sw_init(struct atl1_adapter *adapter)
{
        struct atl1_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;

        /* PCI config space info */
        pci_read_config_byte(pdev, PCI_REVISION_ID, &hw->revision_id);

        hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
        hw->min_frame_size = MINIMUM_ETHERNET_FRAME_SIZE;

        adapter->wol = 0;
        adapter->rx_buffer_len = (hw->max_frame_size + 7) & ~7;
        adapter->ict = 50000;   /* 100ms */
        adapter->link_speed = SPEED_0;  /* hardware init */
        adapter->link_duplex = FULL_DUPLEX;

        hw->phy_configured = false;
        hw->preamble_len = 7;
        hw->ipgt = 0x60;
        hw->min_ifg = 0x50;
        hw->ipgr1 = 0x40;
        hw->ipgr2 = 0x60;
        hw->max_retry = 0xf;
        hw->lcol = 0x37;
        hw->jam_ipg = 7;
        hw->rfd_burst = 8;
        hw->rrd_burst = 8;
        hw->rfd_fetch_gap = 1;
        hw->rx_jumbo_th = adapter->rx_buffer_len / 8;
        hw->rx_jumbo_lkah = 1;
        hw->rrd_ret_timer = 16;
        hw->tpd_burst = 4;
        hw->tpd_fetch_th = 16;
        hw->txf_burst = 0x100;
        hw->tx_jumbo_task_th = (hw->max_frame_size + 7) >> 3;
        hw->tpd_fetch_gap = 1;
        hw->rcb_value = atl1_rcb_64;
        hw->dma_ord = atl1_dma_ord_enh;
        hw->dmar_block = atl1_dma_req_256;
        hw->dmaw_block = atl1_dma_req_256;
        hw->cmb_rrd = 4;
        hw->cmb_tpd = 4;
        hw->cmb_rx_timer = 1;   /* about 2us */
        hw->cmb_tx_timer = 1;   /* about 2us */
        hw->smb_timer = 100000; /* about 200ms */

        atomic_set(&adapter->irq_sem, 0);
        spin_lock_init(&adapter->lock);
        spin_lock_init(&adapter->mb_lock);

        return 0;
}

/*
 * atl1_setup_mem_resources - allocate Tx / RX descriptor resources
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 */
s32 atl1_setup_ring_resources(struct atl1_adapter *adapter)
{
        struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
        struct atl1_rfd_ring *rfd_ring = &adapter->rfd_ring;
        struct atl1_rrd_ring *rrd_ring = &adapter->rrd_ring;
        struct atl1_ring_header *ring_header = &adapter->ring_header;
        struct pci_dev *pdev = adapter->pdev;
        int size;
        u8 offset = 0;

        size = sizeof(struct atl1_buffer) * (tpd_ring->count + rfd_ring->count);
        tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
        if (unlikely(!tpd_ring->buffer_info)) {
                printk(KERN_WARNING "%s: kzalloc failed , size = D%d\n",
                        atl1_driver_name, size);
                goto err_nomem;
        }
        rfd_ring->buffer_info =
            (struct atl1_buffer *)(tpd_ring->buffer_info + tpd_ring->count);

        /* real ring DMA buffer */
        ring_header->size = size = sizeof(struct tx_packet_desc) *
                                        tpd_ring->count
            + sizeof(struct rx_free_desc) * rfd_ring->count
            + sizeof(struct rx_return_desc) * rrd_ring->count
            + sizeof(struct coals_msg_block)
            + sizeof(struct stats_msg_block)
            + 40;               /* "40: for 8 bytes align" huh? -- CHS */

        ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
                                                &ring_header->dma);
        if (unlikely(!ring_header->desc)) {
                printk(KERN_WARNING
                        "%s: pci_alloc_consistent failed, size = D%d\n",
                        atl1_driver_name, size);
                goto err_nomem;
        }

        memset(ring_header->desc, 0, ring_header->size);

        /* init TPD ring */
        tpd_ring->dma = ring_header->dma;
        offset = (tpd_ring->dma & 0x7) ? (8 - (ring_header->dma & 0x7)) : 0;
        tpd_ring->dma += offset;
        tpd_ring->desc = (u8 *) ring_header->desc + offset;
        tpd_ring->size = sizeof(struct tx_packet_desc) * tpd_ring->count;
        atomic_set(&tpd_ring->next_to_use, 0);
        atomic_set(&tpd_ring->next_to_clean, 0);

        /* init RFD ring */
        rfd_ring->dma = tpd_ring->dma + tpd_ring->size;
        offset = (rfd_ring->dma & 0x7) ? (8 - (rfd_ring->dma & 0x7)) : 0;
        rfd_ring->dma += offset;
        rfd_ring->desc = (u8 *) tpd_ring->desc + (tpd_ring->size + offset);
        rfd_ring->size = sizeof(struct rx_free_desc) * rfd_ring->count;
        rfd_ring->next_to_clean = 0;
        /* rfd_ring->next_to_use = rfd_ring->count - 1; */
        atomic_set(&rfd_ring->next_to_use, 0);

        /* init RRD ring */
        rrd_ring->dma = rfd_ring->dma + rfd_ring->size;
        offset = (rrd_ring->dma & 0x7) ? (8 - (rrd_ring->dma & 0x7)) : 0;
        rrd_ring->dma += offset;
        rrd_ring->desc = (u8 *) rfd_ring->desc + (rfd_ring->size + offset);
        rrd_ring->size = sizeof(struct rx_return_desc) * rrd_ring->count;
        rrd_ring->next_to_use = 0;
        atomic_set(&rrd_ring->next_to_clean, 0);

        /* init CMB */
        adapter->cmb.dma = rrd_ring->dma + rrd_ring->size;
        offset = (adapter->cmb.dma & 0x7) ? (8 - (adapter->cmb.dma & 0x7)) : 0;
        adapter->cmb.dma += offset;
        adapter->cmb.cmb =
            (struct coals_msg_block *) ((u8 *) rrd_ring->desc +
                                   (rrd_ring->size + offset));

        /* init SMB */
        adapter->smb.dma = adapter->cmb.dma + sizeof(struct coals_msg_block);
        offset = (adapter->smb.dma & 0x7) ? (8 - (adapter->smb.dma & 0x7)) : 0;
        adapter->smb.dma += offset;
        adapter->smb.smb = (struct stats_msg_block *)
            ((u8 *) adapter->cmb.cmb + (sizeof(struct coals_msg_block) + offset));

        return ATL1_SUCCESS;

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

/*
 * atl1_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 */
static void atl1_irq_enable(struct atl1_adapter *adapter)
{
        if (likely(!atomic_dec_and_test(&adapter->irq_sem)))
                iowrite32(IMR_NORMAL_MASK, adapter->hw.hw_addr + REG_IMR);
}

static void atl1_clear_phy_int(struct atl1_adapter *adapter)
{
        u16 phy_data;
        unsigned long flags;

        spin_lock_irqsave(&adapter->lock, flags);
        atl1_read_phy_reg(&adapter->hw, 19, &phy_data);
        spin_unlock_irqrestore(&adapter->lock, flags);
}

static void atl1_inc_smb(struct atl1_adapter *adapter)
{
        struct stats_msg_block *smb = adapter->smb.smb;

        /* Fill out the OS statistics structure */
        adapter->soft_stats.rx_packets += smb->rx_ok;
        adapter->soft_stats.tx_packets += smb->tx_ok;
        adapter->soft_stats.rx_bytes += smb->rx_byte_cnt;
        adapter->soft_stats.tx_bytes += smb->tx_byte_cnt;
        adapter->soft_stats.multicast += smb->rx_mcast;
        adapter->soft_stats.collisions += (smb->tx_1_col +
                                           smb->tx_2_col * 2 +
                                           smb->tx_late_col +
                                           smb->tx_abort_col *
                                           adapter->hw.max_retry);

        /* Rx Errors */
        adapter->soft_stats.rx_errors += (smb->rx_frag +
                                          smb->rx_fcs_err +
                                          smb->rx_len_err +
                                          smb->rx_sz_ov +
                                          smb->rx_rxf_ov +
                                          smb->rx_rrd_ov + smb->rx_align_err);
        adapter->soft_stats.rx_fifo_errors += smb->rx_rxf_ov;
        adapter->soft_stats.rx_length_errors += smb->rx_len_err;
        adapter->soft_stats.rx_crc_errors += smb->rx_fcs_err;
        adapter->soft_stats.rx_frame_errors += smb->rx_align_err;
        adapter->soft_stats.rx_missed_errors += (smb->rx_rrd_ov +
                                                 smb->rx_rxf_ov);

        adapter->soft_stats.rx_pause += smb->rx_pause;
        adapter->soft_stats.rx_rrd_ov += smb->rx_rrd_ov;
        adapter->soft_stats.rx_trunc += smb->rx_sz_ov;

        /* Tx Errors */
        adapter->soft_stats.tx_errors += (smb->tx_late_col +
                                          smb->tx_abort_col +
                                          smb->tx_underrun + smb->tx_trunc);
        adapter->soft_stats.tx_fifo_errors += smb->tx_underrun;
        adapter->soft_stats.tx_aborted_errors += smb->tx_abort_col;
        adapter->soft_stats.tx_window_errors += smb->tx_late_col;

        adapter->soft_stats.excecol += smb->tx_abort_col;
        adapter->soft_stats.deffer += smb->tx_defer;
        adapter->soft_stats.scc += smb->tx_1_col;
        adapter->soft_stats.mcc += smb->tx_2_col;
        adapter->soft_stats.latecol += smb->tx_late_col;
        adapter->soft_stats.tx_underun += smb->tx_underrun;
        adapter->soft_stats.tx_trunc += smb->tx_trunc;
        adapter->soft_stats.tx_pause += smb->tx_pause;

        adapter->net_stats.rx_packets = adapter->soft_stats.rx_packets;
        adapter->net_stats.tx_packets = adapter->soft_stats.tx_packets;
        adapter->net_stats.rx_bytes = adapter->soft_stats.rx_bytes;
        adapter->net_stats.tx_bytes = adapter->soft_stats.tx_bytes;
        adapter->net_stats.multicast = adapter->soft_stats.multicast;
        adapter->net_stats.collisions = adapter->soft_stats.collisions;
        adapter->net_stats.rx_errors = adapter->soft_stats.rx_errors;
        adapter->net_stats.rx_over_errors =
            adapter->soft_stats.rx_missed_errors;
        adapter->net_stats.rx_length_errors =
            adapter->soft_stats.rx_length_errors;
        adapter->net_stats.rx_crc_errors = adapter->soft_stats.rx_crc_errors;
        adapter->net_stats.rx_frame_errors =
            adapter->soft_stats.rx_frame_errors;
        adapter->net_stats.rx_fifo_errors = adapter->soft_stats.rx_fifo_errors;
        adapter->net_stats.rx_missed_errors =
            adapter->soft_stats.rx_missed_errors;
        adapter->net_stats.tx_errors = adapter->soft_stats.tx_errors;
        adapter->net_stats.tx_fifo_errors = adapter->soft_stats.tx_fifo_errors;
        adapter->net_stats.tx_aborted_errors =
            adapter->soft_stats.tx_aborted_errors;
        adapter->net_stats.tx_window_errors =
            adapter->soft_stats.tx_window_errors;
        adapter->net_stats.tx_carrier_errors =
            adapter->soft_stats.tx_carrier_errors;
}

static void atl1_rx_checksum(struct atl1_adapter *adapter,
                                        struct rx_return_desc *rrd,
                                        struct sk_buff *skb)
{
        skb->ip_summed = CHECKSUM_NONE;

        if (unlikely(rrd->pkt_flg & PACKET_FLAG_ERR)) {
                if (rrd->err_flg & (ERR_FLAG_CRC | ERR_FLAG_TRUNC |
                                        ERR_FLAG_CODE | ERR_FLAG_OV)) {
                        adapter->hw_csum_err++;
                        printk(KERN_DEBUG "%s: rx checksum error\n",
                                atl1_driver_name);
                        return;
                }
        }

        /* not IPv4 */
        if (!(rrd->pkt_flg & PACKET_FLAG_IPV4))
                /* checksum is invalid, but it's not an IPv4 pkt, so ok */
                return;

        /* IPv4 packet */
        if (likely(!(rrd->err_flg &
                (ERR_FLAG_IP_CHKSUM | ERR_FLAG_L4_CHKSUM)))) {
                skb->ip_summed = CHECKSUM_UNNECESSARY;
                adapter->hw_csum_good++;
                return;
        }

        /* IPv4, but hardware thinks its checksum is wrong */
        printk(KERN_DEBUG "%s: hw csum wrong pkt_flag:%x, err_flag:%x\n",
                atl1_driver_name, rrd->pkt_flg, rrd->err_flg);
        skb->ip_summed = CHECKSUM_COMPLETE;
        skb->csum = htons(rrd->xsz.xsum_sz.rx_chksum);
        adapter->hw_csum_err++;
        return;
}

/*
 * atl1_alloc_rx_buffers - Replace used receive buffers
 * @adapter: address of board private structure
 */
static u16 atl1_alloc_rx_buffers(struct atl1_adapter *adapter)
{
        struct atl1_rfd_ring *rfd_ring = &adapter->rfd_ring;
        struct pci_dev *pdev = adapter->pdev;
        struct page *page;
        unsigned long offset;
        struct atl1_buffer *buffer_info, *next_info;
        struct sk_buff *skb;
        u16 num_alloc = 0;
        u16 rfd_next_to_use, next_next;
        struct rx_free_desc *rfd_desc;

        next_next = rfd_next_to_use = atomic_read(&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 (!buffer_info->alloced && !next_info->alloced) {
                if (buffer_info->skb) {
                        buffer_info->alloced = 1;
                        goto next;
                }

                rfd_desc = ATL1_RFD_DESC(rfd_ring, rfd_next_to_use);

                skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
                if (unlikely(!skb)) {   /* Better luck next round */
                        adapter->net_stats.rx_dropped++;
                        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
                 */
                skb_reserve(skb, NET_IP_ALIGN);

                buffer_info->alloced = 1;
                buffer_info->skb = skb;
                buffer_info->length = (u16) adapter->rx_buffer_len;
                page = virt_to_page(skb->data);
                offset = (unsigned long)skb->data & ~PAGE_MASK;
                buffer_info->dma = pci_map_page(pdev, page, offset,
                                                adapter->rx_buffer_len,
                                                PCI_DMA_FROMDEVICE);
                rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
                rfd_desc->buf_len = cpu_to_le16(adapter->rx_buffer_len);
                rfd_desc->coalese = 0;

next:
                rfd_next_to_use = next_next;
                if (unlikely(++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) {
                /*
                 * Force memory writes to complete before letting h/w
                 * know there are new descriptors to fetch.  (Only
                 * applicable for weak-ordered memory model archs,
                 * such as IA-64).
                 */
                wmb();
                atomic_set(&rfd_ring->next_to_use, (int)rfd_next_to_use);
        }
        return num_alloc;
}

static void atl1_intr_rx(struct atl1_adapter *adapter)
{
        int i, count;
        u16 length;
        u16 rrd_next_to_clean;
        u32 value;
        struct atl1_rfd_ring *rfd_ring = &adapter->rfd_ring;
        struct atl1_rrd_ring *rrd_ring = &adapter->rrd_ring;
        struct atl1_buffer *buffer_info;
        struct rx_return_desc *rrd;
        struct sk_buff *skb;

        count = 0;

        rrd_next_to_clean = atomic_read(&rrd_ring->next_to_clean);

        while (1) {
                rrd = ATL1_RRD_DESC(rrd_ring, rrd_next_to_clean);
                i = 1;
                if (likely(rrd->xsz.valid)) {   /* packet valid */
chk_rrd:
                        /* check rrd status */
                        if (likely(rrd->num_buf == 1))
                                goto rrd_ok;

                        /* rrd seems to be bad */
                        if (unlikely(i-- > 0)) {
                                /* rrd may not be DMAed completely */
                                printk(KERN_DEBUG
                                        "%s: RRD may not be DMAed completely\n",
                                        atl1_driver_name);
                                udelay(1);
                                goto chk_rrd;
                        }
                        /* bad rrd */
                        printk(KERN_DEBUG "%s: bad RRD\n", atl1_driver_name);
                        /* see if update RFD index */
                        if (rrd->num_buf > 1) {
                                u16 num_buf;
                                num_buf =
                                    (rrd->xsz.xsum_sz.pkt_size +
                                     adapter->rx_buffer_len -
                                     1) / adapter->rx_buffer_len;
                                if (rrd->num_buf == num_buf) {
                                        /* clean alloc flag for bad rrd */
                                        while (rfd_ring->next_to_clean !=
                                               (rrd->buf_indx + num_buf)) {
                                                rfd_ring->buffer_info[rfd_ring->
                                                                      next_to_clean].alloced = 0;
                                                if (++rfd_ring->next_to_clean ==
                                                    rfd_ring->count) {
                                                        rfd_ring->
                                                            next_to_clean = 0;
                                                }
                                        }
                                }
                        }

                        /* update rrd */
                        rrd->xsz.valid = 0;
                        if (++rrd_next_to_clean == rrd_ring->count)
                                rrd_next_to_clean = 0;
                        count++;
                        continue;
                } else {        /* current rrd still not be updated */

                        break;
                }
rrd_ok:
                /* clean alloc flag for bad rrd */
                while (rfd_ring->next_to_clean != rrd->buf_indx) {
                        rfd_ring->buffer_info[rfd_ring->next_to_clean].alloced =
                            0;
                        if (++rfd_ring->next_to_clean == rfd_ring->count)
                                rfd_ring->next_to_clean = 0;
                }

                buffer_info = &rfd_ring->buffer_info[rrd->buf_indx];
                if (++rfd_ring->next_to_clean == rfd_ring->count)
                        rfd_ring->next_to_clean = 0;

                /* update rrd next to clean */
                if (++rrd_next_to_clean == rrd_ring->count)
                        rrd_next_to_clean = 0;
                count++;

                if (unlikely(rrd->pkt_flg & PACKET_FLAG_ERR)) {
                        if (!(rrd->err_flg &
                                (ERR_FLAG_IP_CHKSUM | ERR_FLAG_L4_CHKSUM
                                | ERR_FLAG_LEN))) {
                                /* packet error, don't need upstream */
                                buffer_info->alloced = 0;
                                rrd->xsz.valid = 0;
                                continue;
                        }
                }

                /* Good Receive */
                pci_unmap_page(adapter->pdev, buffer_info->dma,
                               buffer_info->length, PCI_DMA_FROMDEVICE);
                skb = buffer_info->skb;
                length = le16_to_cpu(rrd->xsz.xsum_sz.pkt_size);

                skb_put(skb, length - ETHERNET_FCS_SIZE);

                /* Receive Checksum Offload */
                atl1_rx_checksum(adapter, rrd, skb);
                skb->protocol = eth_type_trans(skb, adapter->netdev);

                if (adapter->vlgrp && (rrd->pkt_flg & PACKET_FLAG_VLAN_INS)) {
                        u16 vlan_tag = (rrd->vlan_tag >> 4) |
                                        ((rrd->vlan_tag & 7) << 13) |
                                        ((rrd->vlan_tag & 8) << 9);
                        vlan_hwaccel_rx(skb, adapter->vlgrp, vlan_tag);
                } else
                        netif_rx(skb);

                /* let protocol layer free skb */
                buffer_info->skb = NULL;
                buffer_info->alloced = 0;
                rrd->xsz.valid = 0;

                adapter->netdev->last_rx = jiffies;
        }

        atomic_set(&rrd_ring->next_to_clean, rrd_next_to_clean);

        atl1_alloc_rx_buffers(adapter);

        /* update mailbox ? */
        if (count) {
                u32 tpd_next_to_use;
                u32 rfd_next_to_use;
                u32 rrd_next_to_clean;

                spin_lock(&adapter->mb_lock);

                tpd_next_to_use = atomic_read(&adapter->tpd_ring.next_to_use);
                rfd_next_to_use =
                    atomic_read(&adapter->rfd_ring.next_to_use);
                rrd_next_to_clean =
                    atomic_read(&adapter->rrd_ring.next_to_clean);
                value = ((rfd_next_to_use & MB_RFD_PROD_INDX_MASK) <<
                        MB_RFD_PROD_INDX_SHIFT) |
                        ((rrd_next_to_clean & MB_RRD_CONS_INDX_MASK) <<
                        MB_RRD_CONS_INDX_SHIFT) |
                        ((tpd_next_to_use & MB_TPD_PROD_INDX_MASK) <<
                        MB_TPD_PROD_INDX_SHIFT);
                iowrite32(value, adapter->hw.hw_addr + REG_MAILBOX);
                spin_unlock(&adapter->mb_lock);
        }
}

static void atl1_intr_tx(struct atl1_adapter *adapter)
{
        struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
        struct atl1_buffer *buffer_info;
        u16 sw_tpd_next_to_clean;
        u16 cmb_tpd_next_to_clean;
        u8 update = 0;

        sw_tpd_next_to_clean = atomic_read(&tpd_ring->next_to_clean);
        cmb_tpd_next_to_clean = le16_to_cpu(adapter->cmb.cmb->tpd_cons_idx);

        while (cmb_tpd_next_to_clean != sw_tpd_next_to_clean) {
                struct tx_packet_desc *tpd;
                update = 1;
                tpd = ATL1_TPD_DESC(tpd_ring, sw_tpd_next_to_clean);
                buffer_info = &tpd_ring->buffer_info[sw_tpd_next_to_clean];
                if (buffer_info->dma) {
                        pci_unmap_page(adapter->pdev, buffer_info->dma,
                                       buffer_info->length, PCI_DMA_TODEVICE);
                        buffer_info->dma = 0;
                }

                if (buffer_info->skb) {
                        dev_kfree_skb_irq(buffer_info->skb);
                        buffer_info->skb = NULL;
                }
                tpd->buffer_addr = 0;
                tpd->desc.data = 0;

                if (++sw_tpd_next_to_clean == tpd_ring->count)
                        sw_tpd_next_to_clean = 0;
        }
        atomic_set(&tpd_ring->next_to_clean, sw_tpd_next_to_clean);

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

static void atl1_check_for_link(struct atl1_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        u16 phy_data = 0;

        spin_lock(&adapter->lock);
        adapter->phy_timer_pending = false;
        atl1_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
        atl1_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
        spin_unlock(&adapter->lock);

        /* notify upper layer link down ASAP */
        if (!(phy_data & BMSR_LSTATUS)) {       /* Link Down */
                if (netif_carrier_ok(netdev)) { /* old link state: Up */
                        printk(KERN_INFO "%s: %s link is down\n",
                               atl1_driver_name, netdev->name);
                        adapter->link_speed = SPEED_0;
                        netif_carrier_off(netdev);
                        netif_stop_queue(netdev);
                }
        }
        schedule_work(&adapter->link_chg_task);
}

/*
 * atl1_intr - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 * @pt_regs: CPU registers structure
 */
static irqreturn_t atl1_intr(int irq, void *data)
{
        /*struct atl1_adapter *adapter = ((struct net_device *)data)->priv;*/
        struct atl1_adapter *adapter = netdev_priv(data);
        u32 status;
        u8 update_rx;
        int max_ints = 10;

        status = adapter->cmb.cmb->int_stats;
        if (!status)
                return IRQ_NONE;

        update_rx = 0;

        do {
                /* clear CMB interrupt status at once */
                adapter->cmb.cmb->int_stats = 0;

                if (status & ISR_GPHY)  /* clear phy status */
                        atl1_clear_phy_int(adapter);

                /* clear ISR status, and Enable CMB DMA/Disable Interrupt */
                iowrite32(status | ISR_DIS_INT, adapter->hw.hw_addr + REG_ISR);

                /* check if SMB intr */
                if (status & ISR_SMB)
                        atl1_inc_smb(adapter);

                /* check if PCIE PHY Link down */
                if (status & ISR_PHY_LINKDOWN) {
                        printk(KERN_DEBUG "%s: pcie phy link down %x\n",
                                atl1_driver_name, status);
                        if (netif_running(adapter->netdev)) {   /* reset MAC */
                                iowrite32(0, adapter->hw.hw_addr + REG_IMR);
                                schedule_work(&adapter->pcie_dma_to_rst_task);
                                return IRQ_HANDLED;
                        }
                }

                /* check if DMA read/write error ? */
                if (status & (ISR_DMAR_TO_RST | ISR_DMAW_TO_RST)) {
                        printk(KERN_DEBUG
                                "%s: pcie DMA r/w error (status = 0x%x)\n",
                                atl1_driver_name, status);
                        iowrite32(0, adapter->hw.hw_addr + REG_IMR);
                        schedule_work(&adapter->pcie_dma_to_rst_task);
                        return IRQ_HANDLED;
                }

                /* link event */
                if (status & ISR_GPHY) {
                        adapter->soft_stats.tx_carrier_errors++;
                        atl1_check_for_link(adapter);
                }

                /* transmit event */
                if (status & ISR_CMB_TX)
                        atl1_intr_tx(adapter);

                /* rx exception */
                if (unlikely(status & (ISR_RXF_OV | ISR_RFD_UNRUN |
                                ISR_RRD_OV | ISR_HOST_RFD_UNRUN |
                                ISR_HOST_RRD_OV | ISR_CMB_RX))) {
                        if (status &
                            (ISR_RXF_OV | ISR_RFD_UNRUN | ISR_RRD_OV |
                             ISR_HOST_RFD_UNRUN | ISR_HOST_RRD_OV))
                                printk(KERN_INFO
                                        "%s: rx exception: status = 0x%x\n",
                                        atl1_driver_name, status);
                        atl1_intr_rx(adapter);
                }

                if (--max_ints < 0)
                        break;

        } while ((status = adapter->cmb.cmb->int_stats));

        /* re-enable Interrupt */
        iowrite32(ISR_DIS_SMB | ISR_DIS_DMA, adapter->hw.hw_addr + REG_ISR);
        return IRQ_HANDLED;
}

/*
 * atl1_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 atl1_set_multi(struct net_device *netdev)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        struct atl1_hw *hw = &adapter->hw;
        struct dev_mc_list *mc_ptr;
        u32 rctl;
        u32 hash_value;

        /* Check for Promiscuous and All Multicast modes */
        rctl = ioread32(hw->hw_addr + REG_MAC_CTRL);
        if (netdev->flags & IFF_PROMISC)
                rctl |= MAC_CTRL_PROMIS_EN;
        else if (netdev->flags & IFF_ALLMULTI) {
                rctl |= MAC_CTRL_MC_ALL_EN;
                rctl &= ~MAC_CTRL_PROMIS_EN;
        } else
                rctl &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);

        iowrite32(rctl, hw->hw_addr + REG_MAC_CTRL);

        /* clear the old settings from the multicast hash table */
        iowrite32(0, hw->hw_addr + REG_RX_HASH_TABLE);
        iowrite32(0, (hw->hw_addr + REG_RX_HASH_TABLE) + (1 << 2));

        /* compute mc addresses' hash value ,and put it into hash table */
        for (mc_ptr = netdev->mc_list; mc_ptr; mc_ptr = mc_ptr->next) {
                hash_value = atl1_hash_mc_addr(hw, mc_ptr->dmi_addr);
                atl1_hash_set(hw, hash_value);
        }
}

static void atl1_setup_mac_ctrl(struct atl1_adapter *adapter)
{
        u32 value;
        struct atl1_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        /* Config MAC CTRL Register */
        value = MAC_CTRL_TX_EN | MAC_CTRL_RX_EN;
        /* duplex */
        if (FULL_DUPLEX == adapter->link_duplex)
                value |= MAC_CTRL_DUPLX;
        /* speed */
        value |= ((u32) ((SPEED_1000 == adapter->link_speed) ?
                         MAC_CTRL_SPEED_1000 : MAC_CTRL_SPEED_10_100) <<
                  MAC_CTRL_SPEED_SHIFT);
        /* flow control */
        value |= (MAC_CTRL_TX_FLOW | MAC_CTRL_RX_FLOW);
        /* PAD & CRC */
        value |= (MAC_CTRL_ADD_CRC | MAC_CTRL_PAD);
        /* preamble length */
        value |= (((u32) adapter->hw.preamble_len
                   & MAC_CTRL_PRMLEN_MASK) << MAC_CTRL_PRMLEN_SHIFT);
        /* vlan */
        if (adapter->vlgrp)
                value |= MAC_CTRL_RMV_VLAN;
        /* rx checksum
           if (adapter->rx_csum)
           value |= MAC_CTRL_RX_CHKSUM_EN;
         */
        /* filter mode */
        value |= MAC_CTRL_BC_EN;
        if (netdev->flags & IFF_PROMISC)
                value |= MAC_CTRL_PROMIS_EN;
        else if (netdev->flags & IFF_ALLMULTI)
                value |= MAC_CTRL_MC_ALL_EN;
        /* value |= MAC_CTRL_LOOPBACK; */
        iowrite32(value, hw->hw_addr + REG_MAC_CTRL);
}

static u32 atl1_check_link(struct atl1_adapter *adapter)
{
        struct atl1_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        u32 ret_val;
        u16 speed, duplex, phy_data;
        int reconfig = 0;

        /* MII_BMSR must read twice */
        atl1_read_phy_reg(hw, MII_BMSR, &phy_data);
        atl1_read_phy_reg(hw, MII_BMSR, &phy_data);
        if (!(phy_data & BMSR_LSTATUS)) {       /* link down */
                if (netif_carrier_ok(netdev)) { /* old link state: Up */
                        printk(KERN_INFO "%s: link is down\n",
                                atl1_driver_name);
                        adapter->link_speed = SPEED_0;
                        netif_carrier_off(netdev);
                        netif_stop_queue(netdev);
                }
                return ATL1_SUCCESS;
        }

        /* Link Up */
        ret_val = atl1_get_speed_and_duplex(hw, &speed, &duplex);
        if (ret_val)
                return ret_val;

        switch (hw->media_type) {
        case MEDIA_TYPE_1000M_FULL:
                if (speed != SPEED_1000 || duplex != FULL_DUPLEX)
                        reconfig = 1;
                break;
        case MEDIA_TYPE_100M_FULL:
                if (speed != SPEED_100 || duplex != FULL_DUPLEX)
                        reconfig = 1;
                break;
        case MEDIA_TYPE_100M_HALF:
                if (speed != SPEED_100 || duplex != HALF_DUPLEX)
                        reconfig = 1;
                break;
        case MEDIA_TYPE_10M_FULL:
                if (speed != SPEED_10 || duplex != FULL_DUPLEX)
                        reconfig = 1;
                break;
        case MEDIA_TYPE_10M_HALF:
                if (speed != SPEED_10 || duplex != HALF_DUPLEX)
                        reconfig = 1;
                break;
        }

        /* link result is our setting */
        if (!reconfig) {
                if (adapter->link_speed != speed
                    || adapter->link_duplex != duplex) {
                        adapter->link_speed = speed;
                        adapter->link_duplex = duplex;
                        atl1_setup_mac_ctrl(adapter);
                        printk(KERN_INFO "%s: %s link is up %d Mbps %s\n",
                               atl1_driver_name, netdev->name,
                               adapter->link_speed,
                               adapter->link_duplex ==
                               FULL_DUPLEX ? "full duplex" : "half duplex");
                }
                if (!netif_carrier_ok(netdev)) {        /* Link down -> Up */
                        netif_carrier_on(netdev);
                        netif_wake_queue(netdev);
                }
                return ATL1_SUCCESS;
        }

        /* change orignal link status */
        if (netif_carrier_ok(netdev)) {
                adapter->link_speed = SPEED_0;
                netif_carrier_off(netdev);
                netif_stop_queue(netdev);
        }

        if (hw->media_type != MEDIA_TYPE_AUTO_SENSOR &&
            hw->media_type != MEDIA_TYPE_1000M_FULL) {
                switch (hw->media_type) {
                case MEDIA_TYPE_100M_FULL:
                        phy_data = MII_CR_FULL_DUPLEX | MII_CR_SPEED_100 |
                                   MII_CR_RESET;
                        break;
                case MEDIA_TYPE_100M_HALF:
                        phy_data = MII_CR_SPEED_100 | MII_CR_RESET;
                        break;
                case MEDIA_TYPE_10M_FULL:
                        phy_data =
                            MII_CR_FULL_DUPLEX | MII_CR_SPEED_10 | MII_CR_RESET;
                        break;
                default:        /* MEDIA_TYPE_10M_HALF: */
                        phy_data = MII_CR_SPEED_10 | MII_CR_RESET;
                        break;
                }
                atl1_write_phy_reg(hw, MII_BMCR, phy_data);
                return ATL1_SUCCESS;
        }

        /* auto-neg, insert timer to re-config phy */
        if (!adapter->phy_timer_pending) {
                adapter->phy_timer_pending = true;
                mod_timer(&adapter->phy_config_timer, jiffies + 3 * HZ);
        }

        return ATL1_SUCCESS;
}

static void set_flow_ctrl_old(struct atl1_adapter *adapter)
{
        u32 hi, lo, value;

        /* RFD Flow Control */
        value = adapter->rfd_ring.count;
        hi = value / 16;
        if (hi < 2)
                hi = 2;
        lo = value * 7 / 8;

        value = ((hi & RXQ_RXF_PAUSE_TH_HI_MASK) << RXQ_RXF_PAUSE_TH_HI_SHIFT) |
            ((lo & RXQ_RXF_PAUSE_TH_LO_MASK) << RXQ_RXF_PAUSE_TH_LO_SHIFT);
        iowrite32(value, adapter->hw.hw_addr + REG_RXQ_RXF_PAUSE_THRESH);

        /* RRD Flow Control */
        value = adapter->rrd_ring.count;
        lo = value / 16;
        hi = value * 7 / 8;
        if (lo < 2)
                lo = 2;
        value = ((hi & RXQ_RRD_PAUSE_TH_HI_MASK) << RXQ_RRD_PAUSE_TH_HI_SHIFT) |
            ((lo & RXQ_RRD_PAUSE_TH_LO_MASK) << RXQ_RRD_PAUSE_TH_LO_SHIFT);
        iowrite32(value, adapter->hw.hw_addr + REG_RXQ_RRD_PAUSE_THRESH);
}

static void set_flow_ctrl_new(struct atl1_hw *hw)
{
        u32 hi, lo, value;

        /* RXF Flow Control */
        value = ioread32(hw->hw_addr + REG_SRAM_RXF_LEN);
        lo = value / 16;
        if (lo < 192)
                lo = 192;
        hi = value * 7 / 8;
        if (hi < lo)
                hi = lo + 16;
        value = ((hi & RXQ_RXF_PAUSE_TH_HI_MASK) << RXQ_RXF_PAUSE_TH_HI_SHIFT) |
            ((lo & RXQ_RXF_PAUSE_TH_LO_MASK) << RXQ_RXF_PAUSE_TH_LO_SHIFT);
        iowrite32(value, hw->hw_addr + REG_RXQ_RXF_PAUSE_THRESH);

        /* RRD Flow Control */
        value = ioread32(hw->hw_addr + REG_SRAM_RRD_LEN);
        lo = value / 8;
        hi = value * 7 / 8;
        if (lo < 2)
                lo = 2;
        if (hi < lo)
                hi = lo + 3;
        value = ((hi & RXQ_RRD_PAUSE_TH_HI_MASK) << RXQ_RRD_PAUSE_TH_HI_SHIFT) |
            ((lo & RXQ_RRD_PAUSE_TH_LO_MASK) << RXQ_RRD_PAUSE_TH_LO_SHIFT);
        iowrite32(value, hw->hw_addr + REG_RXQ_RRD_PAUSE_THRESH);
}

/*
 * atl1_configure - Configure Transmit&Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx /Rx unit of the MAC after a reset.
 */
static u32 atl1_configure(struct atl1_adapter *adapter)
{
        struct atl1_hw *hw = &adapter->hw;
        u32 value;

        /* clear interrupt status */
        iowrite32(0xffffffff, adapter->hw.hw_addr + REG_ISR);

        /* set MAC Address */
        value = (((u32) hw->mac_addr[2]) << 24) |
                (((u32) hw->mac_addr[3]) << 16) |
                (((u32) hw->mac_addr[4]) << 8) |
                (((u32) hw->mac_addr[5]));
        iowrite32(value, hw->hw_addr + REG_MAC_STA_ADDR);
        value = (((u32) hw->mac_addr[0]) << 8) | (((u32) hw->mac_addr[1]));
        iowrite32(value, hw->hw_addr + (REG_MAC_STA_ADDR + 4));

        /* tx / rx ring */

        /* HI base address */
        iowrite32((u32) ((adapter->tpd_ring.dma & 0xffffffff00000000ULL) >> 32),
                hw->hw_addr + REG_DESC_BASE_ADDR_HI);
        /* LO base address */
        iowrite32((u32) (adapter->rfd_ring.dma & 0x00000000ffffffffULL),
                hw->hw_addr + REG_DESC_RFD_ADDR_LO);
        iowrite32((u32) (adapter->rrd_ring.dma & 0x00000000ffffffffULL),
                hw->hw_addr + REG_DESC_RRD_ADDR_LO);
        iowrite32((u32) (adapter->tpd_ring.dma & 0x00000000ffffffffULL),
                hw->hw_addr + REG_DESC_TPD_ADDR_LO);
        iowrite32((u32) (adapter->cmb.dma & 0x00000000ffffffffULL),
                hw->hw_addr + REG_DESC_CMB_ADDR_LO);
        iowrite32((u32) (adapter->smb.dma & 0x00000000ffffffffULL),
                hw->hw_addr + REG_DESC_SMB_ADDR_LO);

        /* element count */
        value = adapter->rrd_ring.count;
        value <<= 16;
        value += adapter->rfd_ring.count;
        iowrite32(value, hw->hw_addr + REG_DESC_RFD_RRD_RING_SIZE);
        iowrite32(adapter->tpd_ring.count, hw->hw_addr + REG_DESC_TPD_RING_SIZE);

        /* Load Ptr */
        iowrite32(1, hw->hw_addr + REG_LOAD_PTR);

        /* config Mailbox */
        value = ((atomic_read(&adapter->tpd_ring.next_to_use)
                  & MB_TPD_PROD_INDX_MASK) << MB_TPD_PROD_INDX_SHIFT) |
            ((atomic_read(&adapter->rrd_ring.next_to_clean)
              & MB_RRD_CONS_INDX_MASK) << MB_RRD_CONS_INDX_SHIFT) |
            ((atomic_read(&adapter->rfd_ring.next_to_use)
              & MB_RFD_PROD_INDX_MASK) << MB_RFD_PROD_INDX_SHIFT);
        iowrite32(value, hw->hw_addr + REG_MAILBOX);

        /* config IPG/IFG */
        value = (((u32) hw->ipgt & MAC_IPG_IFG_IPGT_MASK)
                 << MAC_IPG_IFG_IPGT_SHIFT) |
            (((u32) hw->min_ifg & MAC_IPG_IFG_MIFG_MASK)
             << MAC_IPG_IFG_MIFG_SHIFT) |
            (((u32) hw->ipgr1 & MAC_IPG_IFG_IPGR1_MASK)
             << MAC_IPG_IFG_IPGR1_SHIFT) |
            (((u32) hw->ipgr2 & MAC_IPG_IFG_IPGR2_MASK)
             << MAC_IPG_IFG_IPGR2_SHIFT);
        iowrite32(value, hw->hw_addr + REG_MAC_IPG_IFG);

        /* config  Half-Duplex Control */
        value = ((u32) hw->lcol & MAC_HALF_DUPLX_CTRL_LCOL_MASK) |
            (((u32) hw->max_retry & MAC_HALF_DUPLX_CTRL_RETRY_MASK)
             << MAC_HALF_DUPLX_CTRL_RETRY_SHIFT) |
            MAC_HALF_DUPLX_CTRL_EXC_DEF_EN |
            (0xa << MAC_HALF_DUPLX_CTRL_ABEBT_SHIFT) |
            (((u32) hw->jam_ipg & MAC_HALF_DUPLX_CTRL_JAMIPG_MASK)
             << MAC_HALF_DUPLX_CTRL_JAMIPG_SHIFT);
        iowrite32(value, hw->hw_addr + REG_MAC_HALF_DUPLX_CTRL);

        /* set Interrupt Moderator Timer */
        iowrite16(adapter->imt, hw->hw_addr + REG_IRQ_MODU_TIMER_INIT);
        iowrite32(MASTER_CTRL_ITIMER_EN, hw->hw_addr + REG_MASTER_CTRL);

        /* set Interrupt Clear Timer */
        iowrite16(adapter->ict, hw->hw_addr + REG_CMBDISDMA_TIMER);

        /* set MTU, 4 : VLAN */
        iowrite32(hw->max_frame_size + 4, hw->hw_addr + REG_MTU);

        /* jumbo size & rrd retirement timer */
        value = (((u32) hw->rx_jumbo_th & RXQ_JMBOSZ_TH_MASK)
                 << RXQ_JMBOSZ_TH_SHIFT) |
            (((u32) hw->rx_jumbo_lkah & RXQ_JMBO_LKAH_MASK)
             << RXQ_JMBO_LKAH_SHIFT) |
            (((u32) hw->rrd_ret_timer & RXQ_RRD_TIMER_MASK)
             << RXQ_RRD_TIMER_SHIFT);
        iowrite32(value, hw->hw_addr + REG_RXQ_JMBOSZ_RRDTIM);

        /* Flow Control */
        switch (hw->dev_rev) {
        case 0x8001:
        case 0x9001:
        case 0x9002:
        case 0x9003:
                set_flow_ctrl_old(adapter);
                break;
        default:
                set_flow_ctrl_new(hw);
                break;
        }

        /* config TXQ */
        value = (((u32) hw->tpd_burst & TXQ_CTRL_TPD_BURST_NUM_MASK)
                 << TXQ_CTRL_TPD_BURST_NUM_SHIFT) |
            (((u32) hw->txf_burst & TXQ_CTRL_TXF_BURST_NUM_MASK)
             << TXQ_CTRL_TXF_BURST_NUM_SHIFT) |
            (((u32) hw->tpd_fetch_th & TXQ_CTRL_TPD_FETCH_TH_MASK)
             << TXQ_CTRL_TPD_FETCH_TH_SHIFT) | TXQ_CTRL_ENH_MODE | TXQ_CTRL_EN;
        iowrite32(value, hw->hw_addr + REG_TXQ_CTRL);

        /* min tpd fetch gap & tx jumbo packet size threshold for taskoffload */
        value = (((u32) hw->tx_jumbo_task_th & TX_JUMBO_TASK_TH_MASK)
                 << TX_JUMBO_TASK_TH_SHIFT) |
            (((u32) hw->tpd_fetch_gap & TX_TPD_MIN_IPG_MASK)
             << TX_TPD_MIN_IPG_SHIFT);
        iowrite32(value, hw->hw_addr + REG_TX_JUMBO_TASK_TH_TPD_IPG);

        /* config RXQ */
        value = (((u32) hw->rfd_burst & RXQ_CTRL_RFD_BURST_NUM_MASK)
                 << RXQ_CTRL_RFD_BURST_NUM_SHIFT) |
            (((u32) hw->rrd_burst & RXQ_CTRL_RRD_BURST_THRESH_MASK)
             << RXQ_CTRL_RRD_BURST_THRESH_SHIFT) |
            (((u32) hw->rfd_fetch_gap & RXQ_CTRL_RFD_PREF_MIN_IPG_MASK)
             << RXQ_CTRL_RFD_PREF_MIN_IPG_SHIFT) |
            RXQ_CTRL_CUT_THRU_EN | RXQ_CTRL_EN;
        iowrite32(value, hw->hw_addr + REG_RXQ_CTRL);

        /* config DMA Engine */
        value = ((((u32) hw->dmar_block) & DMA_CTRL_DMAR_BURST_LEN_MASK)
                 << DMA_CTRL_DMAR_BURST_LEN_SHIFT) |
            ((((u32) hw->dmaw_block) & DMA_CTRL_DMAR_BURST_LEN_MASK)
             << DMA_CTRL_DMAR_BURST_LEN_SHIFT) |
            DMA_CTRL_DMAR_EN | DMA_CTRL_DMAW_EN;
        value |= (u32) hw->dma_ord;
        if (atl1_rcb_128 == hw->rcb_value)
                value |= DMA_CTRL_RCB_VALUE;
        iowrite32(value, hw->hw_addr + REG_DMA_CTRL);

        /* config CMB / SMB */
        value = hw->cmb_rrd | ((u32) hw->cmb_tpd << 16);
        iowrite32(value, hw->hw_addr + REG_CMB_WRITE_TH);
        value = hw->cmb_rx_timer | ((u32) hw->cmb_tx_timer << 16);
        iowrite32(value, hw->hw_addr + REG_CMB_WRITE_TIMER);
        iowrite32(hw->smb_timer, hw->hw_addr + REG_SMB_TIMER);

        /* --- enable CMB / SMB */
        value = CSMB_CTRL_CMB_EN | CSMB_CTRL_SMB_EN;
        iowrite32(value, hw->hw_addr + REG_CSMB_CTRL);

        value = ioread32(adapter->hw.hw_addr + REG_ISR);
        if (unlikely((value & ISR_PHY_LINKDOWN) != 0))
                value = 1;      /* config failed */
        else
                value = 0;

        /* clear all interrupt status */
        iowrite32(0x3fffffff, adapter->hw.hw_addr + REG_ISR);
        iowrite32(0, adapter->hw.hw_addr + REG_ISR);
        return value;
}

/*
 * atl1_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 */
static void atl1_irq_disable(struct atl1_adapter *adapter)
{
        atomic_inc(&adapter->irq_sem);
        iowrite32(0, adapter->hw.hw_addr + REG_IMR);
        ioread32(adapter->hw.hw_addr + REG_IMR);
        synchronize_irq(adapter->pdev->irq);
}

static void atl1_vlan_rx_register(struct net_device *netdev,
                                struct vlan_group *grp)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        unsigned long flags;
        u32 ctrl;

        spin_lock_irqsave(&adapter->lock, flags);
        /* atl1_irq_disable(adapter); */
        adapter->vlgrp = grp;

        if (grp) {
                /* enable VLAN tag insert/strip */
                ctrl = ioread32(adapter->hw.hw_addr + REG_MAC_CTRL);
                ctrl |= MAC_CTRL_RMV_VLAN;
                iowrite32(ctrl, adapter->hw.hw_addr + REG_MAC_CTRL);
        } else {
                /* disable VLAN tag insert/strip */
                ctrl = ioread32(adapter->hw.hw_addr + REG_MAC_CTRL);
                ctrl &= ~MAC_CTRL_RMV_VLAN;
                iowrite32(ctrl, adapter->hw.hw_addr + REG_MAC_CTRL);
        }

        /* atl1_irq_enable(adapter); */
        spin_unlock_irqrestore(&adapter->lock, flags);
}

/* FIXME: justify or remove -- CHS */
static void atl1_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
{
        /* We don't do Vlan filtering */
        return;
}

/* FIXME: this looks wrong too -- CHS */
static void atl1_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        unsigned long flags;

        spin_lock_irqsave(&adapter->lock, flags);
        /* atl1_irq_disable(adapter); */
        vlan_group_set_device(adapter->vlgrp, vid, NULL);
        /* atl1_irq_enable(adapter); */
        spin_unlock_irqrestore(&adapter->lock, flags);
        /* We don't do Vlan filtering */
        return;
}

static void atl1_restore_vlan(struct atl1_adapter *adapter)
{
        atl1_vlan_rx_register(adapter->netdev, adapter->vlgrp);
        if (adapter->vlgrp) {
                u16 vid;
                for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
                        if (!vlan_group_get_device(adapter->vlgrp, vid))
                                continue;
                        atl1_vlan_rx_add_vid(adapter->netdev, vid);
                }
        }
}

static u16 tpd_avail(struct atl1_tpd_ring *tpd_ring)
{
        u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
        u16 next_to_use = atomic_read(&tpd_ring->next_to_use);
        return ((next_to_clean >
                 next_to_use) ? next_to_clean - next_to_use -
                1 : tpd_ring->count + next_to_clean - next_to_use - 1);
}

static int atl1_tso(struct atl1_adapter *adapter, struct sk_buff *skb,
                         struct tso_param *tso)
{
        /* We enter this function holding a spinlock. */
        u8 ipofst;
        int err;

        if (skb_shinfo(skb)->gso_size) {
                if (skb_header_cloned(skb)) {
                        err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
                        if (unlikely(err))
                                return err;
                }

                if (skb->protocol == ntohs(ETH_P_IP)) {
                        skb->nh.iph->tot_len = 0;
                        skb->nh.iph->check = 0;
                        skb->h.th->check =
                            ~csum_tcpudp_magic(skb->nh.iph->saddr,
                                               skb->nh.iph->daddr, 0,
                                               IPPROTO_TCP, 0);
                        ipofst = skb->nh.raw - skb->data;
                        if (ipofst != ENET_HEADER_SIZE) /* 802.3 frame */
                                tso->tsopl |= 1 << TSO_PARAM_ETHTYPE_SHIFT;

                        tso->tsopl |= (skb->nh.iph->ihl &
                                CSUM_PARAM_IPHL_MASK) << CSUM_PARAM_IPHL_SHIFT;
                        tso->tsopl |= ((skb->h.th->doff << 2) &
                                TSO_PARAM_TCPHDRLEN_MASK) << TSO_PARAM_TCPHDRLEN_SHIFT;
                        tso->tsopl |= (skb_shinfo(skb)->gso_size &
                                TSO_PARAM_MSS_MASK) << TSO_PARAM_MSS_SHIFT;
                        tso->tsopl |= 1 << TSO_PARAM_IPCKSUM_SHIFT;
                        tso->tsopl |= 1 << TSO_PARAM_TCPCKSUM_SHIFT;
                        tso->tsopl |= 1 << TSO_PARAM_SEGMENT_SHIFT;
                        return true;
                }
        }
        return false;
}

static int atl1_tx_csum(struct atl1_adapter *adapter, struct sk_buff *skb,
                        struct csum_param *csum)
{
        u8 css, cso;

        if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
                cso = skb->h.raw - skb->data;
                css = (skb->h.raw + skb->csum_offset) - skb->data;
                if (unlikely(cso & 0x1)) {
                        printk(KERN_DEBUG "%s: payload offset != even number\n",
                                atl1_driver_name);
                        return -1;
                }
                csum->csumpl |= (cso & CSUM_PARAM_PLOADOFFSET_MASK) <<
                        CSUM_PARAM_PLOADOFFSET_SHIFT;
                csum->csumpl |= (css & CSUM_PARAM_XSUMOFFSET_MASK) <<
                        CSUM_PARAM_XSUMOFFSET_SHIFT;
                csum->csumpl |= 1 << CSUM_PARAM_CUSTOMCKSUM_SHIFT;
                return true;
        }

        return true;
}

static void atl1_tx_map(struct atl1_adapter *adapter,
                                struct sk_buff *skb, bool tcp_seg)
{
        /* We enter this function holding a spinlock. */
        struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
        struct atl1_buffer *buffer_info;
        struct page *page;
        int first_buf_len = skb->len;
        unsigned long offset;
        unsigned int nr_frags;
        unsigned int f;
        u16 tpd_next_to_use;
        u16 proto_hdr_len;
        u16 i, m, len12;

        first_buf_len -= skb->data_len;
        nr_frags = skb_shinfo(skb)->nr_frags;
        tpd_next_to_use = atomic_read(&tpd_ring->next_to_use);
        buffer_info = &tpd_ring->buffer_info[tpd_next_to_use];
        if (unlikely(buffer_info->skb))
                BUG();
        buffer_info->skb = NULL;        /* put skb in last TPD */

        if (tcp_seg) {
                /* TSO/GSO */
                proto_hdr_len =
                    ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
                buffer_info->length = proto_hdr_len;
                page = virt_to_page(skb->data);
                offset = (unsigned long)skb->data & ~PAGE_MASK;
                buffer_info->dma = pci_map_page(adapter->pdev, page,
                                                offset, proto_hdr_len,
                                                PCI_DMA_TODEVICE);

                if (++tpd_next_to_use == tpd_ring->count)
                        tpd_next_to_use = 0;

                if (first_buf_len > proto_hdr_len) {
                        len12 = first_buf_len - proto_hdr_len;
                        m = (len12 + MAX_TX_BUF_LEN - 1) / MAX_TX_BUF_LEN;
                        for (i = 0; i < m; i++) {
                                buffer_info =
                                    &tpd_ring->buffer_info[tpd_next_to_use];
                                buffer_info->skb = NULL;
                                buffer_info->length =
                                    (MAX_TX_BUF_LEN >=
                                     len12) ? MAX_TX_BUF_LEN : len12;
                                len12 -= buffer_info->length;
                                page = virt_to_page(skb->data +
                                                 (proto_hdr_len +
                                                  i * MAX_TX_BUF_LEN));
                                offset = (unsigned long)(skb->data +
                                                        (proto_hdr_len +
                                                        i * MAX_TX_BUF_LEN)) &
                                                        ~PAGE_MASK;
                                buffer_info->dma =
                                    pci_map_page(adapter->pdev, page, offset,
                                                 buffer_info->length,
                                                 PCI_DMA_TODEVICE);
                                if (++tpd_next_to_use == tpd_ring->count)
                                        tpd_next_to_use = 0;
                        }
                }
        } else {
                /* not TSO/GSO */
                buffer_info->length = first_buf_len;
                page = virt_to_page(skb->data);
                offset = (unsigned long)skb->data & ~PAGE_MASK;
                buffer_info->dma = pci_map_page(adapter->pdev, page,
                                                offset, first_buf_len,
                                                PCI_DMA_TODEVICE);
                if (++tpd_next_to_use == tpd_ring->count)
                        tpd_next_to_use = 0;
        }

        for (f = 0; f < nr_frags; f++) {
                struct skb_frag_struct *frag;
                u16 lenf, i, m;

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

                m = (lenf + MAX_TX_BUF_LEN - 1) / MAX_TX_BUF_LEN;
                for (i = 0; i < m; i++) {
                        buffer_info = &tpd_ring->buffer_info[tpd_next_to_use];
                        if (unlikely(buffer_info->skb))
                                BUG();
                        buffer_info->skb = NULL;
                        buffer_info->length =
                            (lenf > MAX_TX_BUF_LEN) ? MAX_TX_BUF_LEN : lenf;
                        lenf -= buffer_info->length;
                        buffer_info->dma =
                            pci_map_page(adapter->pdev, frag->page,
                                         frag->page_offset + i * MAX_TX_BUF_LEN,
                                         buffer_info->length, PCI_DMA_TODEVICE);

                        if (++tpd_next_to_use == tpd_ring->count)
                                tpd_next_to_use = 0;
                }
        }

        /* last tpd's buffer-info */
        buffer_info->skb = skb;
}

static void atl1_tx_queue(struct atl1_adapter *adapter, int count,
                               union tpd_descr *descr)
{
        /* We enter this function holding a spinlock. */
        struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
        int j;
        u32 val;
        struct atl1_buffer *buffer_info;
        struct tx_packet_desc *tpd;
        u16 tpd_next_to_use = atomic_read(&tpd_ring->next_to_use);

        for (j = 0; j < count; j++) {
                buffer_info = &tpd_ring->buffer_info[tpd_next_to_use];
                tpd = ATL1_TPD_DESC(&adapter->tpd_ring, tpd_next_to_use);
                tpd->desc.csum.csumpu = descr->csum.csumpu;
                tpd->desc.csum.csumpl = descr->csum.csumpl;
                tpd->desc.tso.tsopu = descr->tso.tsopu;
                tpd->desc.tso.tsopl = descr->tso.tsopl;
                tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
                tpd->desc.data = descr->data;
                tpd->desc.csum.csumpu |= (cpu_to_le16(buffer_info->length) &
                        CSUM_PARAM_BUFLEN_MASK) << CSUM_PARAM_BUFLEN_SHIFT;

                val = (descr->tso.tsopl >> TSO_PARAM_SEGMENT_SHIFT) &
                        TSO_PARAM_SEGMENT_MASK;
                if (val && !j)
                        tpd->desc.tso.tsopl |= 1 << TSO_PARAM_HDRFLAG_SHIFT;

                if (j == (count - 1))
                        tpd->desc.csum.csumpl |= 1 << CSUM_PARAM_EOP_SHIFT;

                if (++tpd_next_to_use == tpd_ring->count)
                        tpd_next_to_use = 0;
        }
        /*
         * Force memory writes to complete before letting h/w
         * know there are new descriptors to fetch.  (Only
         * applicable for weak-ordered memory model archs,
         * such as IA-64).
         */
        wmb();

        atomic_set(&tpd_ring->next_to_use, (int)tpd_next_to_use);
}

static void atl1_update_mailbox(struct atl1_adapter *adapter)
{
        unsigned long flags;
        u32 tpd_next_to_use;
        u32 rfd_next_to_use;
        u32 rrd_next_to_clean;
        u32 value;

        spin_lock_irqsave(&adapter->mb_lock, flags);

        tpd_next_to_use = atomic_read(&adapter->tpd_ring.next_to_use);
        rfd_next_to_use = atomic_read(&adapter->rfd_ring.next_to_use);
        rrd_next_to_clean = atomic_read(&adapter->rrd_ring.next_to_clean);

        value = ((rfd_next_to_use & MB_RFD_PROD_INDX_MASK) <<
                MB_RFD_PROD_INDX_SHIFT) |
                ((rrd_next_to_clean & MB_RRD_CONS_INDX_MASK) <<
                MB_RRD_CONS_INDX_SHIFT) |
                ((tpd_next_to_use & MB_TPD_PROD_INDX_MASK) <<
                MB_TPD_PROD_INDX_SHIFT);
        iowrite32(value, adapter->hw.hw_addr + REG_MAILBOX);

        spin_unlock_irqrestore(&adapter->mb_lock, flags);
}

static int atl1_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        int len = skb->len;
        int tso;
        int count = 1;
        int ret_val;
        u32 val;
        union tpd_descr param;
        u16 frag_size;
        u16 vlan_tag;
        unsigned long flags;
        unsigned int nr_frags = 0;
        unsigned int mss = 0;
        unsigned int f;
        unsigned int proto_hdr_len;

        len -= skb->data_len;

        if (unlikely(skb->len == 0)) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        param.data = 0;
        param.tso.tsopu = 0;
        param.tso.tsopl = 0;
        param.csum.csumpu = 0;
        param.csum.csumpl = 0;

        /* nr_frags will be nonzero if we're doing scatter/gather (SG) */
        nr_frags = skb_shinfo(skb)->nr_frags;
        for (f = 0; f < nr_frags; f++) {
                frag_size = skb_shinfo(skb)->frags[f].size;
                if (frag_size)
                        count +=
                            (frag_size + MAX_TX_BUF_LEN - 1) / MAX_TX_BUF_LEN;
        }

        /* mss will be nonzero if we're doing segment offload (TSO/GSO) */
        mss = skb_shinfo(skb)->gso_size;
        if (mss) {
                if (skb->protocol == htons(ETH_P_IP)) {
                        proto_hdr_len = ((skb->h.raw - skb->data) +
                                         (skb->h.th->doff << 2));
                        if (unlikely(proto_hdr_len > len)) {
                                dev_kfree_skb_any(skb);
                                return NETDEV_TX_OK;
                        }
                        /* need additional TPD ? */
                        if (proto_hdr_len != len)
                                count += (len - proto_hdr_len +
                                        MAX_TX_BUF_LEN - 1) / MAX_TX_BUF_LEN;
                }
        }

        local_irq_save(flags);
        if (!spin_trylock(&adapter->lock)) {
                /* Can't get lock - tell upper layer to requeue */
                local_irq_restore(flags);
                printk(KERN_DEBUG "%s: TX locked\n", atl1_driver_name);
                return NETDEV_TX_LOCKED;
        }

        if (tpd_avail(&adapter->tpd_ring) < count) {
                /* not enough descriptors */
                netif_stop_queue(netdev);
                spin_unlock_irqrestore(&adapter->lock, flags);
                printk(KERN_DEBUG "%s: TX busy\n", atl1_driver_name);
                return NETDEV_TX_BUSY;
        }

        param.data = 0;

        if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
                vlan_tag = vlan_tx_tag_get(skb);
                vlan_tag = (vlan_tag << 4) | (vlan_tag >> 13) |
                        ((vlan_tag >> 9) & 0x8);
                param.csum.csumpl |= 1 << CSUM_PARAM_INSVLAG_SHIFT;
                param.csum.csumpu |= (vlan_tag & CSUM_PARAM_VALANTAG_MASK) <<
                        CSUM_PARAM_VALAN_SHIFT;
        }

        tso = atl1_tso(adapter, skb, &param.tso);
        if (tso < 0) {
                spin_unlock_irqrestore(&adapter->lock, flags);
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (!tso) {
                ret_val = atl1_tx_csum(adapter, skb, &param.csum);
                if (ret_val < 0) {
                        spin_unlock_irqrestore(&adapter->lock, flags);
                        dev_kfree_skb_any(skb);
                        return NETDEV_TX_OK;
                }
        }

        val = (param.csum.csumpl >> CSUM_PARAM_SEGMENT_SHIFT) &
                CSUM_PARAM_SEGMENT_MASK;
        atl1_tx_map(adapter, skb, 1 == val);
        atl1_tx_queue(adapter, count, &param);
        netdev->trans_start = jiffies;
        spin_unlock_irqrestore(&adapter->lock, flags);
        atl1_update_mailbox(adapter);
        return NETDEV_TX_OK;
}

/*
 * atl1_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 *atl1_get_stats(struct net_device *netdev)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        return &adapter->net_stats;
}

/*
 * atl1_clean_rx_ring - Free RFD Buffers
 * @adapter: board private structure
 */
static void atl1_clean_rx_ring(struct atl1_adapter *adapter)
{
        struct atl1_rfd_ring *rfd_ring = &adapter->rfd_ring;
        struct atl1_rrd_ring *rrd_ring = &adapter->rrd_ring;
        struct atl1_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        unsigned long size;
        unsigned int i;

        /* Free all the Rx ring sk_buffs */
        for (i = 0; i < rfd_ring->count; i++) {
                buffer_info = &rfd_ring->buffer_info[i];
                if (buffer_info->dma) {
                        pci_unmap_page(pdev,
                                        buffer_info->dma,
                                        buffer_info->length,
                                        PCI_DMA_FROMDEVICE);
                        buffer_info->dma = 0;
                }
                if (buffer_info->skb) {
                        dev_kfree_skb(buffer_info->skb);
                        buffer_info->skb = NULL;
                }
        }

        size = sizeof(struct atl1_buffer) * rfd_ring->count;
        memset(rfd_ring->buffer_info, 0, size);

        /* Zero out the descriptor ring */
        memset(rfd_ring->desc, 0, rfd_ring->size);

        rfd_ring->next_to_clean = 0;
        atomic_set(&rfd_ring->next_to_use, 0);

        rrd_ring->next_to_use = 0;
        atomic_set(&rrd_ring->next_to_clean, 0);
}

/*
 * atl1_clean_tx_ring - Free Tx Buffers
 * @adapter: board private structure
 */
static void atl1_clean_tx_ring(struct atl1_adapter *adapter)
{
        struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
        struct atl1_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        unsigned long size;
        unsigned int i;

        /* Free all the Tx ring sk_buffs */
        for (i = 0; i < tpd_ring->count; i++) {
                buffer_info = &tpd_ring->buffer_info[i];
                if (buffer_info->dma) {
                        pci_unmap_page(pdev, buffer_info->dma,
                                       buffer_info->length, PCI_DMA_TODEVICE);
                        buffer_info->dma = 0;
                }
        }

        for (i = 0; i < tpd_ring->count; i++) {
                buffer_info = &tpd_ring->buffer_info[i];
                if (buffer_info->skb) {
                        dev_kfree_skb_any(buffer_info->skb);
                        buffer_info->skb = NULL;
                }
        }

        size = sizeof(struct atl1_buffer) * tpd_ring->count;
        memset(tpd_ring->buffer_info, 0, size);

        /* Zero out the descriptor ring */
        memset(tpd_ring->desc, 0, tpd_ring->size);

        atomic_set(&tpd_ring->next_to_use, 0);
        atomic_set(&tpd_ring->next_to_clean, 0);
}

/*
 * atl1_free_ring_resources - Free Tx / RX descriptor Resources
 * @adapter: board private structure
 *
 * Free all transmit software resources
 */
void atl1_free_ring_resources(struct atl1_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        struct atl1_tpd_ring *tpd_ring = &adapter->tpd_ring;
        struct atl1_rfd_ring *rfd_ring = &adapter->rfd_ring;
        struct atl1_rrd_ring *rrd_ring = &adapter->rrd_ring;
        struct atl1_ring_header *ring_header = &adapter->ring_header;

        atl1_clean_tx_ring(adapter);
        atl1_clean_rx_ring(adapter);

        kfree(tpd_ring->buffer_info);
        pci_free_consistent(pdev, ring_header->size, ring_header->desc,
                            ring_header->dma);

        tpd_ring->buffer_info = NULL;
        tpd_ring->desc = NULL;
        tpd_ring->dma = 0;

        rfd_ring->buffer_info = NULL;
        rfd_ring->desc = NULL;
        rfd_ring->dma = 0;

        rrd_ring->desc = NULL;
        rrd_ring->dma = 0;
}

s32 atl1_up(struct atl1_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int err;
        int irq_flags = IRQF_SAMPLE_RANDOM;

        /* hardware has been reset, we need to reload some things */
        atl1_set_multi(netdev);
        atl1_restore_vlan(adapter);
        err = atl1_alloc_rx_buffers(adapter);
        if (unlikely(!err))             /* no RX BUFFER allocated */
                return -ENOMEM;

        if (unlikely(atl1_configure(adapter))) {
                err = -EIO;
                goto err_up;
        }

        err = pci_enable_msi(adapter->pdev);
        if (err) {
                dev_info(&adapter->pdev->dev,
                        "Unable to enable MSI: %d\n", err);
                irq_flags |= IRQF_SHARED;
        }

        err = request_irq(adapter->pdev->irq, &atl1_intr, irq_flags,
                        netdev->name, netdev);
        if (unlikely(err))
                goto err_up;

        mod_timer(&adapter->watchdog_timer, jiffies);
        atl1_irq_enable(adapter);
        atl1_check_link(adapter);
        return 0;

        /* FIXME: unreachable code! -- CHS */
        /* free irq disable any interrupt */
        iowrite32(0, adapter->hw.hw_addr + REG_IMR);
        free_irq(adapter->pdev->irq, netdev);

err_up:
        pci_disable_msi(adapter->pdev);
        /* free rx_buffers */
        atl1_clean_rx_ring(adapter);
        return err;
}

void atl1_down(struct atl1_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        del_timer_sync(&adapter->watchdog_timer);
        del_timer_sync(&adapter->phy_config_timer);
        adapter->phy_timer_pending = false;

        atl1_irq_disable(adapter);
        free_irq(adapter->pdev->irq, netdev);
        pci_disable_msi(adapter->pdev);
        atl1_reset_hw(&adapter->hw);
        adapter->cmb.cmb->int_stats = 0;

        adapter->link_speed = SPEED_0;
        adapter->link_duplex = -1;
        netif_carrier_off(netdev);
        netif_stop_queue(netdev);

        atl1_clean_tx_ring(adapter);
        atl1_clean_rx_ring(adapter);
}

/*
 * atl1_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 atl1_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        int old_mtu = netdev->mtu;
        int max_frame = new_mtu + ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;

        if ((max_frame < MINIMUM_ETHERNET_FRAME_SIZE) ||
            (max_frame > MAX_JUMBO_FRAME_SIZE)) {
                printk(KERN_WARNING "%s: invalid MTU setting\n",
                        atl1_driver_name);
                return -EINVAL;
        }

        adapter->hw.max_frame_size = max_frame;
        adapter->hw.tx_jumbo_task_th = (max_frame + 7) >> 3;
        adapter->rx_buffer_len = (max_frame + 7) & ~7;
        adapter->hw.rx_jumbo_th = adapter->rx_buffer_len / 8;

        netdev->mtu = new_mtu;
        if ((old_mtu != new_mtu) && netif_running(netdev)) {
                atl1_down(adapter);
                atl1_up(adapter);
        }

        return 0;
}

/*
 * atl1_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 atl1_set_mac(struct net_device *netdev, void *p)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        struct sockaddr *addr = p;

        if (netif_running(netdev))
                return -EBUSY;

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

        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
        memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);

        atl1_set_mac_addr(&adapter->hw);
        return 0;
}

/*
 * atl1_watchdog - Timer Call-back
 * @data: pointer to netdev cast into an unsigned long
 */
static void atl1_watchdog(unsigned long data)
{
        struct atl1_adapter *adapter = (struct atl1_adapter *)data;

        /* Reset the timer */
        mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
}

static int mdio_read(struct net_device *netdev, int phy_id, int reg_num)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        u16 result;

        atl1_read_phy_reg(&adapter->hw, reg_num & 0x1f, &result);

        return result;
}

static void mdio_write(struct net_device *netdev, int phy_id, int reg_num, int val)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);

        atl1_write_phy_reg(&adapter->hw, reg_num, val);
}

/*
 * atl1_mii_ioctl -
 * @netdev:
 * @ifreq:
 * @cmd:
 */
static int atl1_mii_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        unsigned long flags;
        int retval;

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

        spin_lock_irqsave(&adapter->lock, flags);
        retval = generic_mii_ioctl(&adapter->mii, if_mii(ifr), cmd, NULL);
        spin_unlock_irqrestore(&adapter->lock, flags);

        return retval;
}

/*
 * atl1_ioctl -
 * @netdev:
 * @ifreq:
 * @cmd:
 */
static int atl1_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        switch (cmd) {
        case SIOCGMIIPHY:
        case SIOCGMIIREG:
        case SIOCSMIIREG:
                return atl1_mii_ioctl(netdev, ifr, cmd);
        default:
                return -EOPNOTSUPP;
        }
}

/*
 * atl1_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 */
static void atl1_tx_timeout(struct net_device *netdev)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        /* Do the reset outside of interrupt context */
        schedule_work(&adapter->tx_timeout_task);
}

/*
 * atl1_phy_config - Timer Call-back
 * @data: pointer to netdev cast into an unsigned long
 */
static void atl1_phy_config(unsigned long data)
{
        struct atl1_adapter *adapter = (struct atl1_adapter *)data;
        struct atl1_hw *hw = &adapter->hw;
        unsigned long flags;

        spin_lock_irqsave(&adapter->lock, flags);
        adapter->phy_timer_pending = false;
        atl1_write_phy_reg(hw, MII_ADVERTISE, hw->mii_autoneg_adv_reg);
        atl1_write_phy_reg(hw, MII_AT001_CR, hw->mii_1000t_ctrl_reg);
        atl1_write_phy_reg(hw, MII_BMCR, MII_CR_RESET | MII_CR_AUTO_NEG_EN);
        spin_unlock_irqrestore(&adapter->lock, flags);
}

int atl1_reset(struct atl1_adapter *adapter)
{
        int ret;

        ret = atl1_reset_hw(&adapter->hw);
        if (ret != ATL1_SUCCESS)
                return ret;
        return atl1_init_hw(&adapter->hw);
}

/*
 * atl1_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 atl1_open(struct net_device *netdev)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        int err;

        /* allocate transmit descriptors */
        err = atl1_setup_ring_resources(adapter);
        if (err)
                return err;

        err = atl1_up(adapter);
        if (err)
                goto err_up;

        return 0;

err_up:
        atl1_reset(adapter);
        return err;
}

/*
 * atl1_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 atl1_close(struct net_device *netdev)
{
        struct atl1_adapter *adapter = netdev_priv(netdev);
        atl1_down(adapter);
        atl1_free_ring_resources(adapter);
        return 0;
}

/*
 * If TPD Buffer size equal to 0, PCIE DMAR_TO_INT
 * will assert. We do soft reset <0x1400=1> according
 * with the SPEC. BUT, it seemes that PCIE or DMA
 * state-machine will not be reset. DMAR_TO_INT will
 * assert again and again.
 */
static void atl1_tx_timeout_task(struct work_struct *work)
{
        struct atl1_adapter *adapter =
                container_of(work, struct atl1_adapter, tx_timeout_task);
        struct net_device *netdev = adapter->netdev;

        netif_device_detach(netdev);
        atl1_down(adapter);
        atl1_up(adapter);
        netif_device_attach(netdev);
}

/*
 * atl1_link_chg_task - deal with link change event Out of interrupt context
 */
static void atl1_link_chg_task(struct work_struct *work)
{
        struct atl1_adapter *adapter =
               container_of(work, struct atl1_adapter, link_chg_task);
        unsigned long flags;

        spin_lock_irqsave(&adapter->lock, flags);
        atl1_check_link(adapter);
        spin_unlock_irqrestore(&adapter->lock, flags);
}

/*
 * atl1_pcie_patch - Patch for PCIE module
 */
static void atl1_pcie_patch(struct atl1_adapter *adapter)
{
        u32 value;
        value = 0x6500;
        iowrite32(value, adapter->hw.hw_addr + 0x12FC);
        /* pcie flow control mode change */
        value = ioread32(adapter->hw.hw_addr + 0x1008);
        value |= 0x8000;
        iowrite32(value, adapter->hw.hw_addr + 0x1008);
}

/*
 * When ACPI resume on some VIA MotherBoard, the Interrupt Disable bit/0x400
 * on PCI Command register is disable.
 * The function enable this bit.
 * Brackett, 2006/03/15
 */
static void atl1_via_workaround(struct atl1_adapter *adapter)
{
        unsigned long value;

        value = ioread16(adapter->hw.hw_addr + PCI_COMMAND);
        if (value & PCI_COMMAND_INTX_DISABLE)
                value &= ~PCI_COMMAND_INTX_DISABLE;
        iowrite32(value, adapter->hw.hw_addr + PCI_COMMAND);
}

/*
 * atl1_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in atl1_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * atl1_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 atl1_probe(struct pci_dev *pdev,
                              const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct atl1_adapter *adapter;
        static int cards_found = 0;
        bool pci_using_64 = true;
        int err;

        err = pci_enable_device(pdev);
        if (err)
                return err;

        err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
        if (err) {
                err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
                if (err) {
                        printk(KERN_DEBUG
                                "%s: no usable DMA configuration, aborting\n",
                                atl1_driver_name);
                        goto err_dma;
                }
                pci_using_64 = false;
        }
        /* Mark all PCI regions associated with PCI device
         * pdev as being reserved by owner atl1_driver_name
         */
        err = pci_request_regions(pdev, atl1_driver_name);
        if (err)
                goto err_request_regions;

        /* Enables bus-mastering on the device and calls
         * pcibios_set_master to do the needed arch specific settings
         */
        pci_set_master(pdev);

        netdev = alloc_etherdev(sizeof(struct atl1_adapter));
        if (!netdev) {
                err = -ENOMEM;
                goto err_alloc_etherdev;
        }
        SET_MODULE_OWNER(netdev);
        SET_NETDEV_DEV(netdev, &pdev->dev);

        pci_set_drvdata(pdev, netdev);
        adapter = netdev_priv(netdev);
        adapter->netdev = netdev;
        adapter->pdev = pdev;
        adapter->hw.back = adapter;

        adapter->hw.hw_addr = pci_iomap(pdev, 0, 0);
        if (!adapter->hw.hw_addr) {
                err = -EIO;
                goto err_pci_iomap;
        }
        /* get device revision number */
        adapter->hw.dev_rev = ioread16(adapter->hw.hw_addr + (REG_MASTER_CTRL + 2));

        /* set default ring resource counts */
        adapter->rfd_ring.count = adapter->rrd_ring.count = ATL1_DEFAULT_RFD;
        adapter->tpd_ring.count = ATL1_DEFAULT_TPD;

        adapter->mii.dev = netdev;
        adapter->mii.mdio_read = mdio_read;
        adapter->mii.mdio_write = mdio_write;
        adapter->mii.phy_id_mask = 0x1f;
        adapter->mii.reg_num_mask = 0x1f;

        netdev->open = &atl1_open;
        netdev->stop = &atl1_close;
        netdev->hard_start_xmit = &atl1_xmit_frame;
        netdev->get_stats = &atl1_get_stats;
        netdev->set_multicast_list = &atl1_set_multi;
        netdev->set_mac_address = &atl1_set_mac;
        netdev->change_mtu = &atl1_change_mtu;
        netdev->do_ioctl = &atl1_ioctl;
        netdev->tx_timeout = &atl1_tx_timeout;
        netdev->watchdog_timeo = 5 * HZ;
        netdev->vlan_rx_register = atl1_vlan_rx_register;
        netdev->vlan_rx_add_vid = atl1_vlan_rx_add_vid;
        netdev->vlan_rx_kill_vid = atl1_vlan_rx_kill_vid;
        netdev->ethtool_ops = &atl1_ethtool_ops;
        adapter->bd_number = cards_found;
        adapter->pci_using_64 = pci_using_64;

        /* setup the private structure */
        err = atl1_sw_init(adapter);
        if (err)
                goto err_common;

        netdev->features = NETIF_F_HW_CSUM;
        netdev->features |= NETIF_F_SG;
        netdev->features |= (NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX);

        /*
         * FIXME - Until tso performance gets fixed, disable the feature.
         * Enable it with ethtool -K if desired.
         */
        /* netdev->features |= NETIF_F_TSO; */

        if (pci_using_64)
                netdev->features |= NETIF_F_HIGHDMA;

        netdev->features |= NETIF_F_LLTX;

        /*
         * patch for some L1 of old version,
         * the final version of L1 may not need these
         * patches
         */
        /* atl1_pcie_patch(adapter); */

        /* really reset GPHY core */
        iowrite16(0, adapter->hw.hw_addr + REG_GPHY_ENABLE);

        /*
         * reset the controller to
         * put the device in a known good starting state
         */
        if (atl1_reset_hw(&adapter->hw)) {
                err = -EIO;
                goto err_common;
        }

        /* copy the MAC address out of the EEPROM */
        atl1_read_mac_addr(&adapter->hw);
        memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);

        if (!is_valid_ether_addr(netdev->dev_addr)) {
                err = -EIO;
                goto err_common;
        }

        atl1_check_options(adapter);

        /* pre-init the MAC, and setup link */
        err = atl1_init_hw(&adapter->hw);
        if (err) {
                err = -EIO;
                goto err_common;
        }

        atl1_pcie_patch(adapter);
        /* assume we have no link for now */
        netif_carrier_off(netdev);
        netif_stop_queue(netdev);

        init_timer(&adapter->watchdog_timer);
        adapter->watchdog_timer.function = &atl1_watchdog;
        adapter->watchdog_timer.data = (unsigned long)adapter;

        init_timer(&adapter->phy_config_timer);
        adapter->phy_config_timer.function = &atl1_phy_config;
        adapter->phy_config_timer.data = (unsigned long)adapter;
        adapter->phy_timer_pending = false;

        INIT_WORK(&adapter->tx_timeout_task, atl1_tx_timeout_task);

        INIT_WORK(&adapter->link_chg_task, atl1_link_chg_task);

        INIT_WORK(&adapter->pcie_dma_to_rst_task, atl1_tx_timeout_task);

        err = register_netdev(netdev);
        if (err)
                goto err_common;

        cards_found++;
        atl1_via_workaround(adapter);
        return 0;

err_common:
        pci_iounmap(pdev, adapter->hw.hw_addr);
err_pci_iomap:
        free_netdev(netdev);
err_alloc_etherdev:
        pci_release_regions(pdev);
err_dma:
err_request_regions:
        pci_disable_device(pdev);
        return err;
}

/*
 * atl1_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * atl1_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 atl1_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1_adapter *adapter;
        /* Device not available. Return. */
        if (!netdev)
                return;

        adapter = netdev_priv(netdev);

        /* Some atl1 boards lack persistent storage for their MAC, and get it
         * from the BIOS during POST.  If we've been messing with the MAC
         * address, we need to save the permanent one.
         */
        if (memcmp(adapter->hw.mac_addr, adapter->hw.perm_mac_addr, ETH_ALEN)) {
                memcpy(adapter->hw.mac_addr, adapter->hw.perm_mac_addr, ETH_ALEN);
                atl1_set_mac_addr(&adapter->hw);
        }

        iowrite16(0, adapter->hw.hw_addr + REG_GPHY_ENABLE);
        unregister_netdev(netdev);
        pci_iounmap(pdev, adapter->hw.hw_addr);
        pci_release_regions(pdev);
        free_netdev(netdev);
        pci_disable_device(pdev);
}

#ifdef CONFIG_PM
static int atl1_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1_adapter *adapter = netdev_priv(netdev);
        struct atl1_hw *hw = &adapter->hw;
        u32 ctrl = 0;
        u32 wufc = adapter->wol;

        netif_device_detach(netdev);
        if (netif_running(netdev))
                atl1_down(adapter);

        atl1_read_phy_reg(hw, MII_BMSR, (u16 *) & ctrl);
        atl1_read_phy_reg(hw, MII_BMSR, (u16 *) & ctrl);
        if (ctrl & BMSR_LSTATUS)
                wufc &= ~ATL1_WUFC_LNKC;

        /* reduce speed to 10/100M */
        if (wufc) {
                atl1_phy_enter_power_saving(hw);
                /* if resume, let driver to re- setup link */
                hw->phy_configured = false;
                atl1_set_mac_addr(hw);
                atl1_set_multi(netdev);

                ctrl = 0;
                /* turn on magic packet wol */
                if (wufc & ATL1_WUFC_MAG)
                        ctrl = WOL_MAGIC_EN | WOL_MAGIC_PME_EN;

                /* turn on Link change WOL */
                if (wufc & ATL1_WUFC_LNKC)
                        ctrl |= (WOL_LINK_CHG_EN | WOL_LINK_CHG_PME_EN);
                iowrite32(ctrl, hw->hw_addr + REG_WOL_CTRL);

                /* turn on all-multi mode if wake on multicast is enabled */
                ctrl = ioread32(hw->hw_addr + REG_MAC_CTRL);
                ctrl &= ~MAC_CTRL_DBG;
                ctrl &= ~MAC_CTRL_PROMIS_EN;
                if (wufc & ATL1_WUFC_MC)
                        ctrl |= MAC_CTRL_MC_ALL_EN;
                else
                        ctrl &= ~MAC_CTRL_MC_ALL_EN;

                /* turn on broadcast mode if wake on-BC is enabled */
                if (wufc & ATL1_WUFC_BC)
                        ctrl |= MAC_CTRL_BC_EN;
                else
                        ctrl &= ~MAC_CTRL_BC_EN;

                /* enable RX */
                ctrl |= MAC_CTRL_RX_EN;
                iowrite32(ctrl, hw->hw_addr + REG_MAC_CTRL);
                pci_enable_wake(pdev, PCI_D3hot, 1);
                pci_enable_wake(pdev, PCI_D3cold, 1);   /* 4 == D3 cold */
        } else {
                iowrite32(0, hw->hw_addr + REG_WOL_CTRL);
                pci_enable_wake(pdev, PCI_D3hot, 0);
                pci_enable_wake(pdev, PCI_D3cold, 0);   /* 4 == D3 cold */
        }

        pci_save_state(pdev);
        pci_disable_device(pdev);

        pci_set_power_state(pdev, PCI_D3hot);

        return 0;
}

static int atl1_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1_adapter *adapter = netdev_priv(netdev);
        u32 ret_val;

        pci_set_power_state(pdev, 0);
        pci_restore_state(pdev);

        ret_val = pci_enable_device(pdev);
        pci_enable_wake(pdev, PCI_D3hot, 0);
        pci_enable_wake(pdev, PCI_D3cold, 0);

        iowrite32(0, adapter->hw.hw_addr + REG_WOL_CTRL);
        atl1_reset(adapter);

        if (netif_running(netdev))
                atl1_up(adapter);
        netif_device_attach(netdev);

        atl1_via_workaround(adapter);

        return 0;
}
#else
#define atl1_suspend NULL
#define atl1_resume NULL
#endif

static struct pci_driver atl1_driver = {
        .name = atl1_driver_name,
        .id_table = atl1_pci_tbl,
        .probe = atl1_probe,
        .remove = __devexit_p(atl1_remove),
        /* Power Managment Hooks */
        /* probably broken right now -- CHS */
        .suspend = atl1_suspend,
        .resume = atl1_resume
};

/*
 * atl1_exit_module - Driver Exit Cleanup Routine
 *
 * atl1_exit_module is called just before the driver is removed
 * from memory.
 */
static void __exit atl1_exit_module(void)
{
        pci_unregister_driver(&atl1_driver);
}

/*
 * atl1_init_module - Driver Registration Routine
 *
 * atl1_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 */
static int __init atl1_init_module(void)
{
        printk(KERN_INFO "%s - version %s\n", atl1_driver_string, DRIVER_VERSION);
        printk(KERN_INFO "%s\n", atl1_copyright);
        return pci_register_driver(&atl1_driver);
}

module_init(atl1_init_module);
module_exit(atl1_exit_module);