/*
 * tc35815.c: A TOSHIBA TC35815CF PCI 10/100Mbps ethernet driver for linux.
 *
 * Based on skelton.c by Donald Becker.
 *
 * This driver is a replacement of older and less maintained version.
 * This is a header of the older version:
 *      -----<snip>-----
 *      Copyright 2001 MontaVista Software Inc.
 *      Author: MontaVista Software, Inc.
 *              ahennessy@mvista.com
 *      Copyright (C) 2000-2001 Toshiba Corporation
 *      static const char *version =
 *              "tc35815.c:v0.00 26/07/2000 by Toshiba Corporation\n";
 *      -----<snip>-----
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * (C) Copyright TOSHIBA CORPORATION 2004-2005
 * All Rights Reserved.
 */

#define DRV_VERSION     "1.39"
static const char *version = "tc35815.c:v" DRV_VERSION "\n";
#define MODNAME                 "tc35815"

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/if_vlan.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/phy.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/prefetch.h>
#include <asm/io.h>
#include <asm/byteorder.h>

enum tc35815_chiptype {
        TC35815CF = 0,
        TC35815_NWU,
        TC35815_TX4939,
};

/* indexed by tc35815_chiptype, above */
static const struct {
        const char *name;
} chip_info[] __devinitdata = {
        { "TOSHIBA TC35815CF 10/100BaseTX" },
        { "TOSHIBA TC35815 with Wake on LAN" },
        { "TOSHIBA TC35815/TX4939" },
};

static DEFINE_PCI_DEVICE_TABLE(tc35815_pci_tbl) = {
        {PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC35815CF), .driver_data = TC35815CF },
        {PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC35815_NWU), .driver_data = TC35815_NWU },
        {PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC35815_TX4939), .driver_data = TC35815_TX4939 },
        {0,}
};
MODULE_DEVICE_TABLE(pci, tc35815_pci_tbl);

/* see MODULE_PARM_DESC */
static struct tc35815_options {
        int speed;
        int duplex;
} options;

/*
 * Registers
 */
struct tc35815_regs {
        __u32 DMA_Ctl;          /* 0x00 */
        __u32 TxFrmPtr;
        __u32 TxThrsh;
        __u32 TxPollCtr;
        __u32 BLFrmPtr;
        __u32 RxFragSize;
        __u32 Int_En;
        __u32 FDA_Bas;
        __u32 FDA_Lim;          /* 0x20 */
        __u32 Int_Src;
        __u32 unused0[2];
        __u32 PauseCnt;
        __u32 RemPauCnt;
        __u32 TxCtlFrmStat;
        __u32 unused1;
        __u32 MAC_Ctl;          /* 0x40 */
        __u32 CAM_Ctl;
        __u32 Tx_Ctl;
        __u32 Tx_Stat;
        __u32 Rx_Ctl;
        __u32 Rx_Stat;
        __u32 MD_Data;
        __u32 MD_CA;
        __u32 CAM_Adr;          /* 0x60 */
        __u32 CAM_Data;
        __u32 CAM_Ena;
        __u32 PROM_Ctl;
        __u32 PROM_Data;
        __u32 Algn_Cnt;
        __u32 CRC_Cnt;
        __u32 Miss_Cnt;
};

/*
 * Bit assignments
 */
/* DMA_Ctl bit assign ------------------------------------------------------- */
#define DMA_RxAlign            0x00c00000 /* 1:Reception Alignment           */
#define DMA_RxAlign_1          0x00400000
#define DMA_RxAlign_2          0x00800000
#define DMA_RxAlign_3          0x00c00000
#define DMA_M66EnStat          0x00080000 /* 1:66MHz Enable State            */
#define DMA_IntMask            0x00040000 /* 1:Interrupt mask                */
#define DMA_SWIntReq           0x00020000 /* 1:Software Interrupt request    */
#define DMA_TxWakeUp           0x00010000 /* 1:Transmit Wake Up              */
#define DMA_RxBigE             0x00008000 /* 1:Receive Big Endian            */
#define DMA_TxBigE             0x00004000 /* 1:Transmit Big Endian           */
#define DMA_TestMode           0x00002000 /* 1:Test Mode                     */
#define DMA_PowrMgmnt          0x00001000 /* 1:Power Management              */
#define DMA_DmBurst_Mask       0x000001fc /* DMA Burst size                  */

/* RxFragSize bit assign ---------------------------------------------------- */
#define RxFrag_EnPack          0x00008000 /* 1:Enable Packing                */
#define RxFrag_MinFragMask     0x00000ffc /* Minimum Fragment                */

/* MAC_Ctl bit assign ------------------------------------------------------- */
#define MAC_Link10             0x00008000 /* 1:Link Status 10Mbits           */
#define MAC_EnMissRoll         0x00002000 /* 1:Enable Missed Roll            */
#define MAC_MissRoll           0x00000400 /* 1:Missed Roll                   */
#define MAC_Loop10             0x00000080 /* 1:Loop 10 Mbps                  */
#define MAC_Conn_Auto          0x00000000 /*00:Connection mode (Automatic)   */
#define MAC_Conn_10M           0x00000020 /*01:                (10Mbps endec)*/
#define MAC_Conn_Mll           0x00000040 /*10:                (Mll clock)   */
#define MAC_MacLoop            0x00000010 /* 1:MAC Loopback                  */
#define MAC_FullDup            0x00000008 /* 1:Full Duplex 0:Half Duplex     */
#define MAC_Reset              0x00000004 /* 1:Software Reset                */
#define MAC_HaltImm            0x00000002 /* 1:Halt Immediate                */
#define MAC_HaltReq            0x00000001 /* 1:Halt request                  */

/* PROM_Ctl bit assign ------------------------------------------------------ */
#define PROM_Busy              0x00008000 /* 1:Busy (Start Operation)        */
#define PROM_Read              0x00004000 /*10:Read operation                */
#define PROM_Write             0x00002000 /*01:Write operation               */
#define PROM_Erase             0x00006000 /*11:Erase operation               */
                                          /*00:Enable or Disable Writting,   */
                                          /*      as specified in PROM_Addr. */
#define PROM_Addr_Ena          0x00000030 /*11xxxx:PROM Write enable         */
                                          /*00xxxx:           disable        */

/* CAM_Ctl bit assign ------------------------------------------------------- */
#define CAM_CompEn             0x00000010 /* 1:CAM Compare Enable            */
#define CAM_NegCAM             0x00000008 /* 1:Reject packets CAM recognizes,*/
                                          /*                    accept other */
#define CAM_BroadAcc           0x00000004 /* 1:Broadcast assept              */
#define CAM_GroupAcc           0x00000002 /* 1:Multicast assept              */
#define CAM_StationAcc         0x00000001 /* 1:unicast accept                */

/* CAM_Ena bit assign ------------------------------------------------------- */
#define CAM_ENTRY_MAX                  21   /* CAM Data entry max count      */
#define CAM_Ena_Mask ((1<<CAM_ENTRY_MAX)-1) /* CAM Enable bits (Max 21bits)  */
#define CAM_Ena_Bit(index)      (1 << (index))
#define CAM_ENTRY_DESTINATION   0
#define CAM_ENTRY_SOURCE        1
#define CAM_ENTRY_MACCTL        20

/* Tx_Ctl bit assign -------------------------------------------------------- */
#define Tx_En                  0x00000001 /* 1:Transmit enable               */
#define Tx_TxHalt              0x00000002 /* 1:Transmit Halt Request         */
#define Tx_NoPad               0x00000004 /* 1:Suppress Padding              */
#define Tx_NoCRC               0x00000008 /* 1:Suppress Padding              */
#define Tx_FBack               0x00000010 /* 1:Fast Back-off                 */
#define Tx_EnUnder             0x00000100 /* 1:Enable Underrun               */
#define Tx_EnExDefer           0x00000200 /* 1:Enable Excessive Deferral     */
#define Tx_EnLCarr             0x00000400 /* 1:Enable Lost Carrier           */
#define Tx_EnExColl            0x00000800 /* 1:Enable Excessive Collision    */
#define Tx_EnLateColl          0x00001000 /* 1:Enable Late Collision         */
#define Tx_EnTxPar             0x00002000 /* 1:Enable Transmit Parity        */
#define Tx_EnComp              0x00004000 /* 1:Enable Completion             */

/* Tx_Stat bit assign ------------------------------------------------------- */
#define Tx_TxColl_MASK         0x0000000F /* Tx Collision Count              */
#define Tx_ExColl              0x00000010 /* Excessive Collision             */
#define Tx_TXDefer             0x00000020 /* Transmit Defered                */
#define Tx_Paused              0x00000040 /* Transmit Paused                 */
#define Tx_IntTx               0x00000080 /* Interrupt on Tx                 */
#define Tx_Under               0x00000100 /* Underrun                        */
#define Tx_Defer               0x00000200 /* Deferral                        */
#define Tx_NCarr               0x00000400 /* No Carrier                      */
#define Tx_10Stat              0x00000800 /* 10Mbps Status                   */
#define Tx_LateColl            0x00001000 /* Late Collision                  */
#define Tx_TxPar               0x00002000 /* Tx Parity Error                 */
#define Tx_Comp                0x00004000 /* Completion                      */
#define Tx_Halted              0x00008000 /* Tx Halted                       */
#define Tx_SQErr               0x00010000 /* Signal Quality Error(SQE)       */

/* Rx_Ctl bit assign -------------------------------------------------------- */
#define Rx_EnGood              0x00004000 /* 1:Enable Good                   */
#define Rx_EnRxPar             0x00002000 /* 1:Enable Receive Parity         */
#define Rx_EnLongErr           0x00000800 /* 1:Enable Long Error             */
#define Rx_EnOver              0x00000400 /* 1:Enable OverFlow               */
#define Rx_EnCRCErr            0x00000200 /* 1:Enable CRC Error              */
#define Rx_EnAlign             0x00000100 /* 1:Enable Alignment              */
#define Rx_IgnoreCRC           0x00000040 /* 1:Ignore CRC Value              */
#define Rx_StripCRC            0x00000010 /* 1:Strip CRC Value               */
#define Rx_ShortEn             0x00000008 /* 1:Short Enable                  */
#define Rx_LongEn              0x00000004 /* 1:Long Enable                   */
#define Rx_RxHalt              0x00000002 /* 1:Receive Halt Request          */
#define Rx_RxEn                0x00000001 /* 1:Receive Intrrupt Enable       */

/* Rx_Stat bit assign ------------------------------------------------------- */
#define Rx_Halted              0x00008000 /* Rx Halted                       */
#define Rx_Good                0x00004000 /* Rx Good                         */
#define Rx_RxPar               0x00002000 /* Rx Parity Error                 */
#define Rx_TypePkt             0x00001000 /* Rx Type Packet                  */
#define Rx_LongErr             0x00000800 /* Rx Long Error                   */
#define Rx_Over                0x00000400 /* Rx Overflow                     */
#define Rx_CRCErr              0x00000200 /* Rx CRC Error                    */
#define Rx_Align               0x00000100 /* Rx Alignment Error              */
#define Rx_10Stat              0x00000080 /* Rx 10Mbps Status                */
#define Rx_IntRx               0x00000040 /* Rx Interrupt                    */
#define Rx_CtlRecd             0x00000020 /* Rx Control Receive              */
#define Rx_InLenErr            0x00000010 /* Rx In Range Frame Length Error  */

#define Rx_Stat_Mask           0x0000FFF0 /* Rx All Status Mask              */

/* Int_En bit assign -------------------------------------------------------- */
#define Int_NRAbtEn            0x00000800 /* 1:Non-recoverable Abort Enable  */
#define Int_TxCtlCmpEn         0x00000400 /* 1:Transmit Ctl Complete Enable  */
#define Int_DmParErrEn         0x00000200 /* 1:DMA Parity Error Enable       */
#define Int_DParDEn            0x00000100 /* 1:Data Parity Error Enable      */
#define Int_EarNotEn           0x00000080 /* 1:Early Notify Enable           */
#define Int_DParErrEn          0x00000040 /* 1:Detected Parity Error Enable  */
#define Int_SSysErrEn          0x00000020 /* 1:Signalled System Error Enable */
#define Int_RMasAbtEn          0x00000010 /* 1:Received Master Abort Enable  */
#define Int_RTargAbtEn         0x00000008 /* 1:Received Target Abort Enable  */
#define Int_STargAbtEn         0x00000004 /* 1:Signalled Target Abort Enable */
#define Int_BLExEn             0x00000002 /* 1:Buffer List Exhausted Enable  */
#define Int_FDAExEn            0x00000001 /* 1:Free Descriptor Area          */
                                          /*               Exhausted Enable  */

/* Int_Src bit assign ------------------------------------------------------- */
#define Int_NRabt              0x00004000 /* 1:Non Recoverable error         */
#define Int_DmParErrStat       0x00002000 /* 1:DMA Parity Error & Clear      */
#define Int_BLEx               0x00001000 /* 1:Buffer List Empty & Clear     */
#define Int_FDAEx              0x00000800 /* 1:FDA Empty & Clear             */
#define Int_IntNRAbt           0x00000400 /* 1:Non Recoverable Abort         */
#define Int_IntCmp             0x00000200 /* 1:MAC control packet complete   */
#define Int_IntExBD            0x00000100 /* 1:Interrupt Extra BD & Clear    */
#define Int_DmParErr           0x00000080 /* 1:DMA Parity Error & Clear      */
#define Int_IntEarNot          0x00000040 /* 1:Receive Data write & Clear    */
#define Int_SWInt              0x00000020 /* 1:Software request & Clear      */
#define Int_IntBLEx            0x00000010 /* 1:Buffer List Empty & Clear     */
#define Int_IntFDAEx           0x00000008 /* 1:FDA Empty & Clear             */
#define Int_IntPCI             0x00000004 /* 1:PCI controller & Clear        */
#define Int_IntMacRx           0x00000002 /* 1:Rx controller & Clear         */
#define Int_IntMacTx           0x00000001 /* 1:Tx controller & Clear         */

/* MD_CA bit assign --------------------------------------------------------- */
#define MD_CA_PreSup           0x00001000 /* 1:Preamble Suppress                     */
#define MD_CA_Busy             0x00000800 /* 1:Busy (Start Operation)        */
#define MD_CA_Wr               0x00000400 /* 1:Write 0:Read                  */


/*
 * Descriptors
 */

/* Frame descripter */
struct FDesc {
        volatile __u32 FDNext;
        volatile __u32 FDSystem;
        volatile __u32 FDStat;
        volatile __u32 FDCtl;
};

/* Buffer descripter */
struct BDesc {
        volatile __u32 BuffData;
        volatile __u32 BDCtl;
};

#define FD_ALIGN        16

/* Frame Descripter bit assign ---------------------------------------------- */
#define FD_FDLength_MASK       0x0000FFFF /* Length MASK                     */
#define FD_BDCnt_MASK          0x001F0000 /* BD count MASK in FD             */
#define FD_FrmOpt_MASK         0x7C000000 /* Frame option MASK               */
#define FD_FrmOpt_BigEndian    0x40000000 /* Tx/Rx */
#define FD_FrmOpt_IntTx        0x20000000 /* Tx only */
#define FD_FrmOpt_NoCRC        0x10000000 /* Tx only */
#define FD_FrmOpt_NoPadding    0x08000000 /* Tx only */
#define FD_FrmOpt_Packing      0x04000000 /* Rx only */
#define FD_CownsFD             0x80000000 /* FD Controller owner bit         */
#define FD_Next_EOL            0x00000001 /* FD EOL indicator                */
#define FD_BDCnt_SHIFT         16

/* Buffer Descripter bit assign --------------------------------------------- */
#define BD_BuffLength_MASK     0x0000FFFF /* Receive Data Size               */
#define BD_RxBDID_MASK         0x00FF0000 /* BD ID Number MASK               */
#define BD_RxBDSeqN_MASK       0x7F000000 /* Rx BD Sequence Number           */
#define BD_CownsBD             0x80000000 /* BD Controller owner bit         */
#define BD_RxBDID_SHIFT        16
#define BD_RxBDSeqN_SHIFT      24


/* Some useful constants. */

#define TX_CTL_CMD      (Tx_EnTxPar | Tx_EnLateColl | \
        Tx_EnExColl | Tx_EnLCarr | Tx_EnExDefer | Tx_EnUnder | \
        Tx_En)  /* maybe  0x7b01 */
/* Do not use Rx_StripCRC -- it causes trouble on BLEx/FDAEx condition */
#define RX_CTL_CMD      (Rx_EnGood | Rx_EnRxPar | Rx_EnLongErr | Rx_EnOver \
        | Rx_EnCRCErr | Rx_EnAlign | Rx_RxEn) /* maybe 0x6f01 */
#define INT_EN_CMD  (Int_NRAbtEn | \
        Int_DmParErrEn | Int_DParDEn | Int_DParErrEn | \
        Int_SSysErrEn  | Int_RMasAbtEn | Int_RTargAbtEn | \
        Int_STargAbtEn | \
        Int_BLExEn  | Int_FDAExEn) /* maybe 0xb7f*/
#define DMA_CTL_CMD     DMA_BURST_SIZE
#define HAVE_DMA_RXALIGN(lp)    likely((lp)->chiptype != TC35815CF)

/* Tuning parameters */
#define DMA_BURST_SIZE  32
#define TX_THRESHOLD    1024
/* used threshold with packet max byte for low pci transfer ability.*/
#define TX_THRESHOLD_MAX 1536
/* setting threshold max value when overrun error occurred this count. */
#define TX_THRESHOLD_KEEP_LIMIT 10

/* 16 + RX_BUF_NUM * 8 + RX_FD_NUM * 16 + TX_FD_NUM * 32 <= PAGE_SIZE*FD_PAGE_NUM */
#define FD_PAGE_NUM 4
#define RX_BUF_NUM      128     /* < 256 */
#define RX_FD_NUM       256     /* >= 32 */
#define TX_FD_NUM       128
#if RX_CTL_CMD & Rx_LongEn
#define RX_BUF_SIZE     PAGE_SIZE
#elif RX_CTL_CMD & Rx_StripCRC
#define RX_BUF_SIZE     \
        L1_CACHE_ALIGN(ETH_FRAME_LEN + VLAN_HLEN + NET_IP_ALIGN)
#else
#define RX_BUF_SIZE     \
        L1_CACHE_ALIGN(ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN + NET_IP_ALIGN)
#endif
#define RX_FD_RESERVE   (2 / 2) /* max 2 BD per RxFD */
#define NAPI_WEIGHT     16

struct TxFD {
        struct FDesc fd;
        struct BDesc bd;
        struct BDesc unused;
};

struct RxFD {
        struct FDesc fd;
        struct BDesc bd[0];     /* variable length */
};

struct FrFD {
        struct FDesc fd;
        struct BDesc bd[RX_BUF_NUM];
};


#define tc_readl(addr)  ioread32(addr)
#define tc_writel(d, addr)      iowrite32(d, addr)

#define TC35815_TX_TIMEOUT  msecs_to_jiffies(400)

/* Information that need to be kept for each controller. */
struct tc35815_local {
        struct pci_dev *pci_dev;

        struct net_device *dev;
        struct napi_struct napi;

        /* statistics */
        struct {
                int max_tx_qlen;
                int tx_ints;
                int rx_ints;
                int tx_underrun;
        } lstats;

        /* Tx control lock.  This protects the transmit buffer ring
         * state along with the "tx full" state of the driver.  This
         * means all netif_queue flow control actions are protected
         * by this lock as well.
         */
        spinlock_t lock;
        spinlock_t rx_lock;

        struct mii_bus *mii_bus;
        struct phy_device *phy_dev;
        int duplex;
        int speed;
        int link;
        struct work_struct restart_work;

        /*
         * Transmitting: Batch Mode.
         *      1 BD in 1 TxFD.
         * Receiving: Non-Packing Mode.
         *      1 circular FD for Free Buffer List.
         *      RX_BUF_NUM BD in Free Buffer FD.
         *      One Free Buffer BD has ETH_FRAME_LEN data buffer.
         */
        void *fd_buf;   /* for TxFD, RxFD, FrFD */
        dma_addr_t fd_buf_dma;
        struct TxFD *tfd_base;
        unsigned int tfd_start;
        unsigned int tfd_end;
        struct RxFD *rfd_base;
        struct RxFD *rfd_limit;
        struct RxFD *rfd_cur;
        struct FrFD *fbl_ptr;
        unsigned int fbl_count;
        struct {
                struct sk_buff *skb;
                dma_addr_t skb_dma;
        } tx_skbs[TX_FD_NUM], rx_skbs[RX_BUF_NUM];
        u32 msg_enable;
        enum tc35815_chiptype chiptype;
};

static inline dma_addr_t fd_virt_to_bus(struct tc35815_local *lp, void *virt)
{
        return lp->fd_buf_dma + ((u8 *)virt - (u8 *)lp->fd_buf);
}
#ifdef DEBUG
static inline void *fd_bus_to_virt(struct tc35815_local *lp, dma_addr_t bus)
{
        return (void *)((u8 *)lp->fd_buf + (bus - lp->fd_buf_dma));
}
#endif
static struct sk_buff *alloc_rxbuf_skb(struct net_device *dev,
                                       struct pci_dev *hwdev,
                                       dma_addr_t *dma_handle)
{
        struct sk_buff *skb;
        skb = netdev_alloc_skb(dev, RX_BUF_SIZE);
        if (!skb)
                return NULL;
        *dma_handle = pci_map_single(hwdev, skb->data, RX_BUF_SIZE,
                                     PCI_DMA_FROMDEVICE);
        if (pci_dma_mapping_error(hwdev, *dma_handle)) {
                dev_kfree_skb_any(skb);
                return NULL;
        }
        skb_reserve(skb, 2);    /* make IP header 4byte aligned */
        return skb;
}

static void free_rxbuf_skb(struct pci_dev *hwdev, struct sk_buff *skb, dma_addr_t dma_handle)
{
        pci_unmap_single(hwdev, dma_handle, RX_BUF_SIZE,
                         PCI_DMA_FROMDEVICE);
        dev_kfree_skb_any(skb);
}

/* Index to functions, as function prototypes. */

static int      tc35815_open(struct net_device *dev);
static int      tc35815_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t      tc35815_interrupt(int irq, void *dev_id);
static int      tc35815_rx(struct net_device *dev, int limit);
static int      tc35815_poll(struct napi_struct *napi, int budget);
static void     tc35815_txdone(struct net_device *dev);
static int      tc35815_close(struct net_device *dev);
static struct   net_device_stats *tc35815_get_stats(struct net_device *dev);
static void     tc35815_set_multicast_list(struct net_device *dev);
static void     tc35815_tx_timeout(struct net_device *dev);
static int      tc35815_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void     tc35815_poll_controller(struct net_device *dev);
#endif
static const struct ethtool_ops tc35815_ethtool_ops;

/* Example routines you must write ;->. */
static void     tc35815_chip_reset(struct net_device *dev);
static void     tc35815_chip_init(struct net_device *dev);

#ifdef DEBUG
static void     panic_queues(struct net_device *dev);
#endif

static void tc35815_restart_work(struct work_struct *work);

static int tc_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
        struct net_device *dev = bus->priv;
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        unsigned long timeout = jiffies + HZ;

        tc_writel(MD_CA_Busy | (mii_id << 5) | (regnum & 0x1f), &tr->MD_CA);
        udelay(12); /* it takes 32 x 400ns at least */
        while (tc_readl(&tr->MD_CA) & MD_CA_Busy) {
                if (time_after(jiffies, timeout))
                        return -EIO;
                cpu_relax();
        }
        return tc_readl(&tr->MD_Data) & 0xffff;
}

static int tc_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 val)
{
        struct net_device *dev = bus->priv;
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        unsigned long timeout = jiffies + HZ;

        tc_writel(val, &tr->MD_Data);
        tc_writel(MD_CA_Busy | MD_CA_Wr | (mii_id << 5) | (regnum & 0x1f),
                  &tr->MD_CA);
        udelay(12); /* it takes 32 x 400ns at least */
        while (tc_readl(&tr->MD_CA) & MD_CA_Busy) {
                if (time_after(jiffies, timeout))
                        return -EIO;
                cpu_relax();
        }
        return 0;
}

static void tc_handle_link_change(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct phy_device *phydev = lp->phy_dev;
        unsigned long flags;
        int status_change = 0;

        spin_lock_irqsave(&lp->lock, flags);
        if (phydev->link &&
            (lp->speed != phydev->speed || lp->duplex != phydev->duplex)) {
                struct tc35815_regs __iomem *tr =
                        (struct tc35815_regs __iomem *)dev->base_addr;
                u32 reg;

                reg = tc_readl(&tr->MAC_Ctl);
                reg |= MAC_HaltReq;
                tc_writel(reg, &tr->MAC_Ctl);
                if (phydev->duplex == DUPLEX_FULL)
                        reg |= MAC_FullDup;
                else
                        reg &= ~MAC_FullDup;
                tc_writel(reg, &tr->MAC_Ctl);
                reg &= ~MAC_HaltReq;
                tc_writel(reg, &tr->MAC_Ctl);

                /*
                 * TX4939 PCFG.SPEEDn bit will be changed on
                 * NETDEV_CHANGE event.
                 */
                /*
                 * WORKAROUND: enable LostCrS only if half duplex
                 * operation.
                 * (TX4939 does not have EnLCarr)
                 */
                if (phydev->duplex == DUPLEX_HALF &&
                    lp->chiptype != TC35815_TX4939)
                        tc_writel(tc_readl(&tr->Tx_Ctl) | Tx_EnLCarr,
                                  &tr->Tx_Ctl);

                lp->speed = phydev->speed;
                lp->duplex = phydev->duplex;
                status_change = 1;
        }

        if (phydev->link != lp->link) {
                if (phydev->link) {
                        /* delayed promiscuous enabling */
                        if (dev->flags & IFF_PROMISC)
                                tc35815_set_multicast_list(dev);
                } else {
                        lp->speed = 0;
                        lp->duplex = -1;
                }
                lp->link = phydev->link;

                status_change = 1;
        }
        spin_unlock_irqrestore(&lp->lock, flags);

        if (status_change && netif_msg_link(lp)) {
                phy_print_status(phydev);
                pr_debug("%s: MII BMCR %04x BMSR %04x LPA %04x\n",
                         dev->name,
                         phy_read(phydev, MII_BMCR),
                         phy_read(phydev, MII_BMSR),
                         phy_read(phydev, MII_LPA));
        }
}

static int tc_mii_probe(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct phy_device *phydev = NULL;
        int phy_addr;
        u32 dropmask;

        /* find the first phy */
        for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
                if (lp->mii_bus->phy_map[phy_addr]) {
                        if (phydev) {
                                printk(KERN_ERR "%s: multiple PHYs found\n",
                                       dev->name);
                                return -EINVAL;
                        }
                        phydev = lp->mii_bus->phy_map[phy_addr];
                        break;
                }
        }

        if (!phydev) {
                printk(KERN_ERR "%s: no PHY found\n", dev->name);
                return -ENODEV;
        }

        /* attach the mac to the phy */
        phydev = phy_connect(dev, dev_name(&phydev->dev),
                             &tc_handle_link_change, 0,
                             lp->chiptype == TC35815_TX4939 ?
                             PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII);
        if (IS_ERR(phydev)) {
                printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
                return PTR_ERR(phydev);
        }
        printk(KERN_INFO "%s: attached PHY driver [%s] "
                "(mii_bus:phy_addr=%s, id=%x)\n",
                dev->name, phydev->drv->name, dev_name(&phydev->dev),
                phydev->phy_id);

        /* mask with MAC supported features */
        phydev->supported &= PHY_BASIC_FEATURES;
        dropmask = 0;
        if (options.speed == 10)
                dropmask |= SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full;
        else if (options.speed == 100)
                dropmask |= SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full;
        if (options.duplex == 1)
                dropmask |= SUPPORTED_10baseT_Full | SUPPORTED_100baseT_Full;
        else if (options.duplex == 2)
                dropmask |= SUPPORTED_10baseT_Half | SUPPORTED_100baseT_Half;
        phydev->supported &= ~dropmask;
        phydev->advertising = phydev->supported;

        lp->link = 0;
        lp->speed = 0;
        lp->duplex = -1;
        lp->phy_dev = phydev;

        return 0;
}

static int tc_mii_init(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        int err;
        int i;

        lp->mii_bus = mdiobus_alloc();
        if (lp->mii_bus == NULL) {
                err = -ENOMEM;
                goto err_out;
        }

        lp->mii_bus->name = "tc35815_mii_bus";
        lp->mii_bus->read = tc_mdio_read;
        lp->mii_bus->write = tc_mdio_write;
        snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%x",
                 (lp->pci_dev->bus->number << 8) | lp->pci_dev->devfn);
        lp->mii_bus->priv = dev;
        lp->mii_bus->parent = &lp->pci_dev->dev;
        lp->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
        if (!lp->mii_bus->irq) {
                err = -ENOMEM;
                goto err_out_free_mii_bus;
        }

        for (i = 0; i < PHY_MAX_ADDR; i++)
                lp->mii_bus->irq[i] = PHY_POLL;

        err = mdiobus_register(lp->mii_bus);
        if (err)
                goto err_out_free_mdio_irq;
        err = tc_mii_probe(dev);
        if (err)
                goto err_out_unregister_bus;
        return 0;

err_out_unregister_bus:
        mdiobus_unregister(lp->mii_bus);
err_out_free_mdio_irq:
        kfree(lp->mii_bus->irq);
err_out_free_mii_bus:
        mdiobus_free(lp->mii_bus);
err_out:
        return err;
}

#ifdef CONFIG_CPU_TX49XX
/*
 * Find a platform_device providing a MAC address.  The platform code
 * should provide a "tc35815-mac" device with a MAC address in its
 * platform_data.
 */
static int __devinit tc35815_mac_match(struct device *dev, void *data)
{
        struct platform_device *plat_dev = to_platform_device(dev);
        struct pci_dev *pci_dev = data;
        unsigned int id = pci_dev->irq;
        return !strcmp(plat_dev->name, "tc35815-mac") && plat_dev->id == id;
}

static int __devinit tc35815_read_plat_dev_addr(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct device *pd = bus_find_device(&platform_bus_type, NULL,
                                            lp->pci_dev, tc35815_mac_match);
        if (pd) {
                if (pd->platform_data)
                        memcpy(dev->dev_addr, pd->platform_data, ETH_ALEN);
                put_device(pd);
                return is_valid_ether_addr(dev->dev_addr) ? 0 : -ENODEV;
        }
        return -ENODEV;
}
#else
static int __devinit tc35815_read_plat_dev_addr(struct net_device *dev)
{
        return -ENODEV;
}
#endif

static int __devinit tc35815_init_dev_addr(struct net_device *dev)
{
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        int i;

        while (tc_readl(&tr->PROM_Ctl) & PROM_Busy)
                ;
        for (i = 0; i < 6; i += 2) {
                unsigned short data;
                tc_writel(PROM_Busy | PROM_Read | (i / 2 + 2), &tr->PROM_Ctl);
                while (tc_readl(&tr->PROM_Ctl) & PROM_Busy)
                        ;
                data = tc_readl(&tr->PROM_Data);
                dev->dev_addr[i] = data & 0xff;
                dev->dev_addr[i+1] = data >> 8;
        }
        if (!is_valid_ether_addr(dev->dev_addr))
                return tc35815_read_plat_dev_addr(dev);
        return 0;
}

static const struct net_device_ops tc35815_netdev_ops = {
        .ndo_open               = tc35815_open,
        .ndo_stop               = tc35815_close,
        .ndo_start_xmit         = tc35815_send_packet,
        .ndo_get_stats          = tc35815_get_stats,
        .ndo_set_rx_mode        = tc35815_set_multicast_list,
        .ndo_tx_timeout         = tc35815_tx_timeout,
        .ndo_do_ioctl           = tc35815_ioctl,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_change_mtu         = eth_change_mtu,
        .ndo_set_mac_address    = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = tc35815_poll_controller,
#endif
};

static int __devinit tc35815_init_one(struct pci_dev *pdev,
                                      const struct pci_device_id *ent)
{
        void __iomem *ioaddr = NULL;
        struct net_device *dev;
        struct tc35815_local *lp;
        int rc;

        static int printed_version;
        if (!printed_version++) {
                printk(version);
                dev_printk(KERN_DEBUG, &pdev->dev,
                           "speed:%d duplex:%d\n",
                           options.speed, options.duplex);
        }

        if (!pdev->irq) {
                dev_warn(&pdev->dev, "no IRQ assigned.\n");
                return -ENODEV;
        }

        /* dev zeroed in alloc_etherdev */
        dev = alloc_etherdev(sizeof(*lp));
        if (dev == NULL)
                return -ENOMEM;

        SET_NETDEV_DEV(dev, &pdev->dev);
        lp = netdev_priv(dev);
        lp->dev = dev;

        /* enable device (incl. PCI PM wakeup), and bus-mastering */
        rc = pcim_enable_device(pdev);
        if (rc)
                goto err_out;
        rc = pcim_iomap_regions(pdev, 1 << 1, MODNAME);
        if (rc)
                goto err_out;
        pci_set_master(pdev);
        ioaddr = pcim_iomap_table(pdev)[1];

        /* Initialize the device structure. */
        dev->netdev_ops = &tc35815_netdev_ops;
        dev->ethtool_ops = &tc35815_ethtool_ops;
        dev->watchdog_timeo = TC35815_TX_TIMEOUT;
        netif_napi_add(dev, &lp->napi, tc35815_poll, NAPI_WEIGHT);

        dev->irq = pdev->irq;
        dev->base_addr = (unsigned long)ioaddr;

        INIT_WORK(&lp->restart_work, tc35815_restart_work);
        spin_lock_init(&lp->lock);
        spin_lock_init(&lp->rx_lock);
        lp->pci_dev = pdev;
        lp->chiptype = ent->driver_data;

        lp->msg_enable = NETIF_MSG_TX_ERR | NETIF_MSG_HW | NETIF_MSG_DRV | NETIF_MSG_LINK;
        pci_set_drvdata(pdev, dev);

        /* Soft reset the chip. */
        tc35815_chip_reset(dev);

        /* Retrieve the ethernet address. */
        if (tc35815_init_dev_addr(dev)) {
                dev_warn(&pdev->dev, "not valid ether addr\n");
                eth_hw_addr_random(dev);
        }

        rc = register_netdev(dev);
        if (rc)
                goto err_out;

        memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
        printk(KERN_INFO "%s: %s at 0x%lx, %pM, IRQ %d\n",
                dev->name,
                chip_info[ent->driver_data].name,
                dev->base_addr,
                dev->dev_addr,
                dev->irq);

        rc = tc_mii_init(dev);
        if (rc)
                goto err_out_unregister;

        return 0;

err_out_unregister:
        unregister_netdev(dev);
err_out:
        free_netdev(dev);
        return rc;
}


static void __devexit tc35815_remove_one(struct pci_dev *pdev)
{
        struct net_device *dev = pci_get_drvdata(pdev);
        struct tc35815_local *lp = netdev_priv(dev);

        phy_disconnect(lp->phy_dev);
        mdiobus_unregister(lp->mii_bus);
        kfree(lp->mii_bus->irq);
        mdiobus_free(lp->mii_bus);
        unregister_netdev(dev);
        free_netdev(dev);
        pci_set_drvdata(pdev, NULL);
}

static int
tc35815_init_queues(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        int i;
        unsigned long fd_addr;

        if (!lp->fd_buf) {
                BUG_ON(sizeof(struct FDesc) +
                       sizeof(struct BDesc) * RX_BUF_NUM +
                       sizeof(struct FDesc) * RX_FD_NUM +
                       sizeof(struct TxFD) * TX_FD_NUM >
                       PAGE_SIZE * FD_PAGE_NUM);

                lp->fd_buf = pci_alloc_consistent(lp->pci_dev,
                                                  PAGE_SIZE * FD_PAGE_NUM,
                                                  &lp->fd_buf_dma);
                if (!lp->fd_buf)
                        return -ENOMEM;
                for (i = 0; i < RX_BUF_NUM; i++) {
                        lp->rx_skbs[i].skb =
                                alloc_rxbuf_skb(dev, lp->pci_dev,
                                                &lp->rx_skbs[i].skb_dma);
                        if (!lp->rx_skbs[i].skb) {
                                while (--i >= 0) {
                                        free_rxbuf_skb(lp->pci_dev,
                                                       lp->rx_skbs[i].skb,
                                                       lp->rx_skbs[i].skb_dma);
                                        lp->rx_skbs[i].skb = NULL;
                                }
                                pci_free_consistent(lp->pci_dev,
                                                    PAGE_SIZE * FD_PAGE_NUM,
                                                    lp->fd_buf,
                                                    lp->fd_buf_dma);
                                lp->fd_buf = NULL;
                                return -ENOMEM;
                        }
                }
                printk(KERN_DEBUG "%s: FD buf %p DataBuf",
                       dev->name, lp->fd_buf);
                printk("\n");
        } else {
                for (i = 0; i < FD_PAGE_NUM; i++)
                        clear_page((void *)((unsigned long)lp->fd_buf +
                                            i * PAGE_SIZE));
        }
        fd_addr = (unsigned long)lp->fd_buf;

        /* Free Descriptors (for Receive) */
        lp->rfd_base = (struct RxFD *)fd_addr;
        fd_addr += sizeof(struct RxFD) * RX_FD_NUM;
        for (i = 0; i < RX_FD_NUM; i++)
                lp->rfd_base[i].fd.FDCtl = cpu_to_le32(FD_CownsFD);
        lp->rfd_cur = lp->rfd_base;
        lp->rfd_limit = (struct RxFD *)fd_addr - (RX_FD_RESERVE + 1);

        /* Transmit Descriptors */
        lp->tfd_base = (struct TxFD *)fd_addr;
        fd_addr += sizeof(struct TxFD) * TX_FD_NUM;
        for (i = 0; i < TX_FD_NUM; i++) {
                lp->tfd_base[i].fd.FDNext = cpu_to_le32(fd_virt_to_bus(lp, &lp->tfd_base[i+1]));
                lp->tfd_base[i].fd.FDSystem = cpu_to_le32(0xffffffff);
                lp->tfd_base[i].fd.FDCtl = cpu_to_le32(0);
        }
        lp->tfd_base[TX_FD_NUM-1].fd.FDNext = cpu_to_le32(fd_virt_to_bus(lp, &lp->tfd_base[0]));
        lp->tfd_start = 0;
        lp->tfd_end = 0;

        /* Buffer List (for Receive) */
        lp->fbl_ptr = (struct FrFD *)fd_addr;
        lp->fbl_ptr->fd.FDNext = cpu_to_le32(fd_virt_to_bus(lp, lp->fbl_ptr));
        lp->fbl_ptr->fd.FDCtl = cpu_to_le32(RX_BUF_NUM | FD_CownsFD);
        /*
         * move all allocated skbs to head of rx_skbs[] array.
         * fbl_count mighe not be RX_BUF_NUM if alloc_rxbuf_skb() in
         * tc35815_rx() had failed.
         */
        lp->fbl_count = 0;
        for (i = 0; i < RX_BUF_NUM; i++) {
                if (lp->rx_skbs[i].skb) {
                        if (i != lp->fbl_count) {
                                lp->rx_skbs[lp->fbl_count].skb =
                                        lp->rx_skbs[i].skb;
                                lp->rx_skbs[lp->fbl_count].skb_dma =
                                        lp->rx_skbs[i].skb_dma;
                        }
                        lp->fbl_count++;
                }
        }
        for (i = 0; i < RX_BUF_NUM; i++) {
                if (i >= lp->fbl_count) {
                        lp->fbl_ptr->bd[i].BuffData = 0;
                        lp->fbl_ptr->bd[i].BDCtl = 0;
                        continue;
                }
                lp->fbl_ptr->bd[i].BuffData =
                        cpu_to_le32(lp->rx_skbs[i].skb_dma);
                /* BDID is index of FrFD.bd[] */
                lp->fbl_ptr->bd[i].BDCtl =
                        cpu_to_le32(BD_CownsBD | (i << BD_RxBDID_SHIFT) |
                                    RX_BUF_SIZE);
        }

        printk(KERN_DEBUG "%s: TxFD %p RxFD %p FrFD %p\n",
               dev->name, lp->tfd_base, lp->rfd_base, lp->fbl_ptr);
        return 0;

}

static void
tc35815_clear_queues(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        int i;

        for (i = 0; i < TX_FD_NUM; i++) {
                u32 fdsystem = le32_to_cpu(lp->tfd_base[i].fd.FDSystem);
                struct sk_buff *skb =
                        fdsystem != 0xffffffff ?
                        lp->tx_skbs[fdsystem].skb : NULL;
#ifdef DEBUG
                if (lp->tx_skbs[i].skb != skb) {
                        printk("%s: tx_skbs mismatch(%d).\n", dev->name, i);
                        panic_queues(dev);
                }
#else
                BUG_ON(lp->tx_skbs[i].skb != skb);
#endif
                if (skb) {
                        pci_unmap_single(lp->pci_dev, lp->tx_skbs[i].skb_dma, skb->len, PCI_DMA_TODEVICE);
                        lp->tx_skbs[i].skb = NULL;
                        lp->tx_skbs[i].skb_dma = 0;
                        dev_kfree_skb_any(skb);
                }
                lp->tfd_base[i].fd.FDSystem = cpu_to_le32(0xffffffff);
        }

        tc35815_init_queues(dev);
}

static void
tc35815_free_queues(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        int i;

        if (lp->tfd_base) {
                for (i = 0; i < TX_FD_NUM; i++) {
                        u32 fdsystem = le32_to_cpu(lp->tfd_base[i].fd.FDSystem);
                        struct sk_buff *skb =
                                fdsystem != 0xffffffff ?
                                lp->tx_skbs[fdsystem].skb : NULL;
#ifdef DEBUG
                        if (lp->tx_skbs[i].skb != skb) {
                                printk("%s: tx_skbs mismatch(%d).\n", dev->name, i);
                                panic_queues(dev);
                        }
#else
                        BUG_ON(lp->tx_skbs[i].skb != skb);
#endif
                        if (skb) {
                                dev_kfree_skb(skb);
                                pci_unmap_single(lp->pci_dev, lp->tx_skbs[i].skb_dma, skb->len, PCI_DMA_TODEVICE);
                                lp->tx_skbs[i].skb = NULL;
                                lp->tx_skbs[i].skb_dma = 0;
                        }
                        lp->tfd_base[i].fd.FDSystem = cpu_to_le32(0xffffffff);
                }
        }

        lp->rfd_base = NULL;
        lp->rfd_limit = NULL;
        lp->rfd_cur = NULL;
        lp->fbl_ptr = NULL;

        for (i = 0; i < RX_BUF_NUM; i++) {
                if (lp->rx_skbs[i].skb) {
                        free_rxbuf_skb(lp->pci_dev, lp->rx_skbs[i].skb,
                                       lp->rx_skbs[i].skb_dma);
                        lp->rx_skbs[i].skb = NULL;
                }
        }
        if (lp->fd_buf) {
                pci_free_consistent(lp->pci_dev, PAGE_SIZE * FD_PAGE_NUM,
                                    lp->fd_buf, lp->fd_buf_dma);
                lp->fd_buf = NULL;
        }
}

static void
dump_txfd(struct TxFD *fd)
{
        printk("TxFD(%p): %08x %08x %08x %08x\n", fd,
               le32_to_cpu(fd->fd.FDNext),
               le32_to_cpu(fd->fd.FDSystem),
               le32_to_cpu(fd->fd.FDStat),
               le32_to_cpu(fd->fd.FDCtl));
        printk("BD: ");
        printk(" %08x %08x",
               le32_to_cpu(fd->bd.BuffData),
               le32_to_cpu(fd->bd.BDCtl));
        printk("\n");
}

static int
dump_rxfd(struct RxFD *fd)
{
        int i, bd_count = (le32_to_cpu(fd->fd.FDCtl) & FD_BDCnt_MASK) >> FD_BDCnt_SHIFT;
        if (bd_count > 8)
                bd_count = 8;
        printk("RxFD(%p): %08x %08x %08x %08x\n", fd,
               le32_to_cpu(fd->fd.FDNext),
               le32_to_cpu(fd->fd.FDSystem),
               le32_to_cpu(fd->fd.FDStat),
               le32_to_cpu(fd->fd.FDCtl));
        if (le32_to_cpu(fd->fd.FDCtl) & FD_CownsFD)
                return 0;
        printk("BD: ");
        for (i = 0; i < bd_count; i++)
                printk(" %08x %08x",
                       le32_to_cpu(fd->bd[i].BuffData),
                       le32_to_cpu(fd->bd[i].BDCtl));
        printk("\n");
        return bd_count;
}

#ifdef DEBUG
static void
dump_frfd(struct FrFD *fd)
{
        int i;
        printk("FrFD(%p): %08x %08x %08x %08x\n", fd,
               le32_to_cpu(fd->fd.FDNext),
               le32_to_cpu(fd->fd.FDSystem),
               le32_to_cpu(fd->fd.FDStat),
               le32_to_cpu(fd->fd.FDCtl));
        printk("BD: ");
        for (i = 0; i < RX_BUF_NUM; i++)
                printk(" %08x %08x",
                       le32_to_cpu(fd->bd[i].BuffData),
                       le32_to_cpu(fd->bd[i].BDCtl));
        printk("\n");
}

static void
panic_queues(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        int i;

        printk("TxFD base %p, start %u, end %u\n",
               lp->tfd_base, lp->tfd_start, lp->tfd_end);
        printk("RxFD base %p limit %p cur %p\n",
               lp->rfd_base, lp->rfd_limit, lp->rfd_cur);
        printk("FrFD %p\n", lp->fbl_ptr);
        for (i = 0; i < TX_FD_NUM; i++)
                dump_txfd(&lp->tfd_base[i]);
        for (i = 0; i < RX_FD_NUM; i++) {
                int bd_count = dump_rxfd(&lp->rfd_base[i]);
                i += (bd_count + 1) / 2;        /* skip BDs */
        }
        dump_frfd(lp->fbl_ptr);
        panic("%s: Illegal queue state.", dev->name);
}
#endif

static void print_eth(const u8 *add)
{
        printk(KERN_DEBUG "print_eth(%p)\n", add);
        printk(KERN_DEBUG " %pM => %pM : %02x%02x\n",
                add + 6, add, add[12], add[13]);
}

static int tc35815_tx_full(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        return (lp->tfd_start + 1) % TX_FD_NUM == lp->tfd_end;
}

static void tc35815_restart(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);

        if (lp->phy_dev) {
                int timeout;

                phy_write(lp->phy_dev, MII_BMCR, BMCR_RESET);
                timeout = 100;
                while (--timeout) {
                        if (!(phy_read(lp->phy_dev, MII_BMCR) & BMCR_RESET))
                                break;
                        udelay(1);
                }
                if (!timeout)
                        printk(KERN_ERR "%s: BMCR reset failed.\n", dev->name);
        }

        spin_lock_bh(&lp->rx_lock);
        spin_lock_irq(&lp->lock);
        tc35815_chip_reset(dev);
        tc35815_clear_queues(dev);
        tc35815_chip_init(dev);
        /* Reconfigure CAM again since tc35815_chip_init() initialize it. */
        tc35815_set_multicast_list(dev);
        spin_unlock_irq(&lp->lock);
        spin_unlock_bh(&lp->rx_lock);

        netif_wake_queue(dev);
}

static void tc35815_restart_work(struct work_struct *work)
{
        struct tc35815_local *lp =
                container_of(work, struct tc35815_local, restart_work);
        struct net_device *dev = lp->dev;

        tc35815_restart(dev);
}

static void tc35815_schedule_restart(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        unsigned long flags;

        /* disable interrupts */
        spin_lock_irqsave(&lp->lock, flags);
        tc_writel(0, &tr->Int_En);
        tc_writel(tc_readl(&tr->DMA_Ctl) | DMA_IntMask, &tr->DMA_Ctl);
        schedule_work(&lp->restart_work);
        spin_unlock_irqrestore(&lp->lock, flags);
}

static void tc35815_tx_timeout(struct net_device *dev)
{
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;

        printk(KERN_WARNING "%s: transmit timed out, status %#x\n",
               dev->name, tc_readl(&tr->Tx_Stat));

        /* Try to restart the adaptor. */
        tc35815_schedule_restart(dev);
        dev->stats.tx_errors++;
}

/*
 * Open/initialize the controller. This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */
static int
tc35815_open(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);

        /*
         * This is used if the interrupt line can turned off (shared).
         * See 3c503.c for an example of selecting the IRQ at config-time.
         */
        if (request_irq(dev->irq, tc35815_interrupt, IRQF_SHARED,
                        dev->name, dev))
                return -EAGAIN;

        tc35815_chip_reset(dev);

        if (tc35815_init_queues(dev) != 0) {
                free_irq(dev->irq, dev);
                return -EAGAIN;
        }

        napi_enable(&lp->napi);

        /* Reset the hardware here. Don't forget to set the station address. */
        spin_lock_irq(&lp->lock);
        tc35815_chip_init(dev);
        spin_unlock_irq(&lp->lock);

        netif_carrier_off(dev);
        /* schedule a link state check */
        phy_start(lp->phy_dev);

        /* We are now ready to accept transmit requeusts from
         * the queueing layer of the networking.
         */
        netif_start_queue(dev);

        return 0;
}

/* This will only be invoked if your driver is _not_ in XOFF state.
 * What this means is that you need not check it, and that this
 * invariant will hold if you make sure that the netif_*_queue()
 * calls are done at the proper times.
 */
static int tc35815_send_packet(struct sk_buff *skb, struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct TxFD *txfd;
        unsigned long flags;

        /* If some error occurs while trying to transmit this
         * packet, you should return '1' from this function.
         * In such a case you _may not_ do anything to the
         * SKB, it is still owned by the network queueing
         * layer when an error is returned.  This means you
         * may not modify any SKB fields, you may not free
         * the SKB, etc.
         */

        /* This is the most common case for modern hardware.
         * The spinlock protects this code from the TX complete
         * hardware interrupt handler.  Queue flow control is
         * thus managed under this lock as well.
         */
        spin_lock_irqsave(&lp->lock, flags);

        /* failsafe... (handle txdone now if half of FDs are used) */
        if ((lp->tfd_start + TX_FD_NUM - lp->tfd_end) % TX_FD_NUM >
            TX_FD_NUM / 2)
                tc35815_txdone(dev);

        if (netif_msg_pktdata(lp))
                print_eth(skb->data);
#ifdef DEBUG
        if (lp->tx_skbs[lp->tfd_start].skb) {
                printk("%s: tx_skbs conflict.\n", dev->name);
                panic_queues(dev);
        }
#else
        BUG_ON(lp->tx_skbs[lp->tfd_start].skb);
#endif
        lp->tx_skbs[lp->tfd_start].skb = skb;
        lp->tx_skbs[lp->tfd_start].skb_dma = pci_map_single(lp->pci_dev, skb->data, skb->len, PCI_DMA_TODEVICE);

        /*add to ring */
        txfd = &lp->tfd_base[lp->tfd_start];
        txfd->bd.BuffData = cpu_to_le32(lp->tx_skbs[lp->tfd_start].skb_dma);
        txfd->bd.BDCtl = cpu_to_le32(skb->len);
        txfd->fd.FDSystem = cpu_to_le32(lp->tfd_start);
        txfd->fd.FDCtl = cpu_to_le32(FD_CownsFD | (1 << FD_BDCnt_SHIFT));

        if (lp->tfd_start == lp->tfd_end) {
                struct tc35815_regs __iomem *tr =
                        (struct tc35815_regs __iomem *)dev->base_addr;
                /* Start DMA Transmitter. */
                txfd->fd.FDNext |= cpu_to_le32(FD_Next_EOL);
                txfd->fd.FDCtl |= cpu_to_le32(FD_FrmOpt_IntTx);
                if (netif_msg_tx_queued(lp)) {
                        printk("%s: starting TxFD.\n", dev->name);
                        dump_txfd(txfd);
                }
                tc_writel(fd_virt_to_bus(lp, txfd), &tr->TxFrmPtr);
        } else {
                txfd->fd.FDNext &= cpu_to_le32(~FD_Next_EOL);
                if (netif_msg_tx_queued(lp)) {
                        printk("%s: queueing TxFD.\n", dev->name);
                        dump_txfd(txfd);
                }
        }
        lp->tfd_start = (lp->tfd_start + 1) % TX_FD_NUM;

        /* If we just used up the very last entry in the
         * TX ring on this device, tell the queueing
         * layer to send no more.
         */
        if (tc35815_tx_full(dev)) {
                if (netif_msg_tx_queued(lp))
                        printk(KERN_WARNING "%s: TxFD Exhausted.\n", dev->name);
                netif_stop_queue(dev);
        }

        /* When the TX completion hw interrupt arrives, this
         * is when the transmit statistics are updated.
         */

        spin_unlock_irqrestore(&lp->lock, flags);
        return NETDEV_TX_OK;
}

#define FATAL_ERROR_INT \
        (Int_IntPCI | Int_DmParErr | Int_IntNRAbt)
static void tc35815_fatal_error_interrupt(struct net_device *dev, u32 status)
{
        static int count;
        printk(KERN_WARNING "%s: Fatal Error Intterrupt (%#x):",
               dev->name, status);
        if (status & Int_IntPCI)
                printk(" IntPCI");
        if (status & Int_DmParErr)
                printk(" DmParErr");
        if (status & Int_IntNRAbt)
                printk(" IntNRAbt");
        printk("\n");
        if (count++ > 100)
                panic("%s: Too many fatal errors.", dev->name);
        printk(KERN_WARNING "%s: Resetting ...\n", dev->name);
        /* Try to restart the adaptor. */
        tc35815_schedule_restart(dev);
}

static int tc35815_do_interrupt(struct net_device *dev, u32 status, int limit)
{
        struct tc35815_local *lp = netdev_priv(dev);
        int ret = -1;

        /* Fatal errors... */
        if (status & FATAL_ERROR_INT) {
                tc35815_fatal_error_interrupt(dev, status);
                return 0;
        }
        /* recoverable errors */
        if (status & Int_IntFDAEx) {
                if (netif_msg_rx_err(lp))
                        dev_warn(&dev->dev,
                                 "Free Descriptor Area Exhausted (%#x).\n",
                                 status);
                dev->stats.rx_dropped++;
                ret = 0;
        }
        if (status & Int_IntBLEx) {
                if (netif_msg_rx_err(lp))
                        dev_warn(&dev->dev,
                                 "Buffer List Exhausted (%#x).\n",
                                 status);
                dev->stats.rx_dropped++;
                ret = 0;
        }
        if (status & Int_IntExBD) {
                if (netif_msg_rx_err(lp))
                        dev_warn(&dev->dev,
                                 "Excessive Buffer Descriptiors (%#x).\n",
                                 status);
                dev->stats.rx_length_errors++;
                ret = 0;
        }

        /* normal notification */
        if (status & Int_IntMacRx) {
                /* Got a packet(s). */
                ret = tc35815_rx(dev, limit);
                lp->lstats.rx_ints++;
        }
        if (status & Int_IntMacTx) {
                /* Transmit complete. */
                lp->lstats.tx_ints++;
                spin_lock_irq(&lp->lock);
                tc35815_txdone(dev);
                spin_unlock_irq(&lp->lock);
                if (ret < 0)
                        ret = 0;
        }
        return ret;
}

/*
 * The typical workload of the driver:
 * Handle the network interface interrupts.
 */
static irqreturn_t tc35815_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct tc35815_local *lp = netdev_priv(dev);
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        u32 dmactl = tc_readl(&tr->DMA_Ctl);

        if (!(dmactl & DMA_IntMask)) {
                /* disable interrupts */
                tc_writel(dmactl | DMA_IntMask, &tr->DMA_Ctl);
                if (napi_schedule_prep(&lp->napi))
                        __napi_schedule(&lp->napi);
                else {
                        printk(KERN_ERR "%s: interrupt taken in poll\n",
                               dev->name);
                        BUG();
                }
                (void)tc_readl(&tr->Int_Src);   /* flush */
                return IRQ_HANDLED;
        }
        return IRQ_NONE;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void tc35815_poll_controller(struct net_device *dev)
{
        disable_irq(dev->irq);
        tc35815_interrupt(dev->irq, dev);
        enable_irq(dev->irq);
}
#endif

/* We have a good packet(s), get it/them out of the buffers. */
static int
tc35815_rx(struct net_device *dev, int limit)
{
        struct tc35815_local *lp = netdev_priv(dev);
        unsigned int fdctl;
        int i;
        int received = 0;

        while (!((fdctl = le32_to_cpu(lp->rfd_cur->fd.FDCtl)) & FD_CownsFD)) {
                int status = le32_to_cpu(lp->rfd_cur->fd.FDStat);
                int pkt_len = fdctl & FD_FDLength_MASK;
                int bd_count = (fdctl & FD_BDCnt_MASK) >> FD_BDCnt_SHIFT;
#ifdef DEBUG
                struct RxFD *next_rfd;
#endif
#if (RX_CTL_CMD & Rx_StripCRC) == 0
                pkt_len -= ETH_FCS_LEN;
#endif

                if (netif_msg_rx_status(lp))
                        dump_rxfd(lp->rfd_cur);
                if (status & Rx_Good) {
                        struct sk_buff *skb;
                        unsigned char *data;
                        int cur_bd;

                        if (--limit < 0)
                                break;
                        BUG_ON(bd_count > 1);
                        cur_bd = (le32_to_cpu(lp->rfd_cur->bd[0].BDCtl)
                                  & BD_RxBDID_MASK) >> BD_RxBDID_SHIFT;
#ifdef DEBUG
                        if (cur_bd >= RX_BUF_NUM) {
                                printk("%s: invalid BDID.\n", dev->name);
                                panic_queues(dev);
                        }
                        BUG_ON(lp->rx_skbs[cur_bd].skb_dma !=
                               (le32_to_cpu(lp->rfd_cur->bd[0].BuffData) & ~3));
                        if (!lp->rx_skbs[cur_bd].skb) {
                                printk("%s: NULL skb.\n", dev->name);
                                panic_queues(dev);
                        }
#else
                        BUG_ON(cur_bd >= RX_BUF_NUM);
#endif
                        skb = lp->rx_skbs[cur_bd].skb;
                        prefetch(skb->data);
                        lp->rx_skbs[cur_bd].skb = NULL;
                        pci_unmap_single(lp->pci_dev,
                                         lp->rx_skbs[cur_bd].skb_dma,
                                         RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
                        if (!HAVE_DMA_RXALIGN(lp) && NET_IP_ALIGN)
                                memmove(skb->data, skb->data - NET_IP_ALIGN,
                                        pkt_len);
                        data = skb_put(skb, pkt_len);
                        if (netif_msg_pktdata(lp))
                                print_eth(data);
                        skb->protocol = eth_type_trans(skb, dev);
                        netif_receive_skb(skb);
                        received++;
                        dev->stats.rx_packets++;
                        dev->stats.rx_bytes += pkt_len;
                } else {
                        dev->stats.rx_errors++;
                        if (netif_msg_rx_err(lp))
                                dev_info(&dev->dev, "Rx error (status %x)\n",
                                         status & Rx_Stat_Mask);
                        /* WORKAROUND: LongErr and CRCErr means Overflow. */
                        if ((status & Rx_LongErr) && (status & Rx_CRCErr)) {
                                status &= ~(Rx_LongErr|Rx_CRCErr);
                                status |= Rx_Over;
                        }
                        if (status & Rx_LongErr)
                                dev->stats.rx_length_errors++;
                        if (status & Rx_Over)
                                dev->stats.rx_fifo_errors++;
                        if (status & Rx_CRCErr)
                                dev->stats.rx_crc_errors++;
                        if (status & Rx_Align)
                                dev->stats.rx_frame_errors++;
                }

                if (bd_count > 0) {
                        /* put Free Buffer back to controller */
                        int bdctl = le32_to_cpu(lp->rfd_cur->bd[bd_count - 1].BDCtl);
                        unsigned char id =
                                (bdctl & BD_RxBDID_MASK) >> BD_RxBDID_SHIFT;
#ifdef DEBUG
                        if (id >= RX_BUF_NUM) {
                                printk("%s: invalid BDID.\n", dev->name);
                                panic_queues(dev);
                        }
#else
                        BUG_ON(id >= RX_BUF_NUM);
#endif
                        /* free old buffers */
                        lp->fbl_count--;
                        while (lp->fbl_count < RX_BUF_NUM)
                        {
                                unsigned char curid =
                                        (id + 1 + lp->fbl_count) % RX_BUF_NUM;
                                struct BDesc *bd = &lp->fbl_ptr->bd[curid];
#ifdef DEBUG
                                bdctl = le32_to_cpu(bd->BDCtl);
                                if (bdctl & BD_CownsBD) {
                                        printk("%s: Freeing invalid BD.\n",
                                               dev->name);
                                        panic_queues(dev);
                                }
#endif
                                /* pass BD to controller */
                                if (!lp->rx_skbs[curid].skb) {
                                        lp->rx_skbs[curid].skb =
                                                alloc_rxbuf_skb(dev,
                                                                lp->pci_dev,
                                                                &lp->rx_skbs[curid].skb_dma);
                                        if (!lp->rx_skbs[curid].skb)
                                                break; /* try on next reception */
                                        bd->BuffData = cpu_to_le32(lp->rx_skbs[curid].skb_dma);
                                }
                                /* Note: BDLength was modified by chip. */
                                bd->BDCtl = cpu_to_le32(BD_CownsBD |
                                                        (curid << BD_RxBDID_SHIFT) |
                                                        RX_BUF_SIZE);
                                lp->fbl_count++;
                        }
                }

                /* put RxFD back to controller */
#ifdef DEBUG
                next_rfd = fd_bus_to_virt(lp,
                                          le32_to_cpu(lp->rfd_cur->fd.FDNext));
                if (next_rfd < lp->rfd_base || next_rfd > lp->rfd_limit) {
                        printk("%s: RxFD FDNext invalid.\n", dev->name);
                        panic_queues(dev);
                }
#endif
                for (i = 0; i < (bd_count + 1) / 2 + 1; i++) {
                        /* pass FD to controller */
#ifdef DEBUG
                        lp->rfd_cur->fd.FDNext = cpu_to_le32(0xdeaddead);
#else
                        lp->rfd_cur->fd.FDNext = cpu_to_le32(FD_Next_EOL);
#endif
                        lp->rfd_cur->fd.FDCtl = cpu_to_le32(FD_CownsFD);
                        lp->rfd_cur++;
                }
                if (lp->rfd_cur > lp->rfd_limit)
                        lp->rfd_cur = lp->rfd_base;
#ifdef DEBUG
                if (lp->rfd_cur != next_rfd)
                        printk("rfd_cur = %p, next_rfd %p\n",
                               lp->rfd_cur, next_rfd);
#endif
        }

        return received;
}

static int tc35815_poll(struct napi_struct *napi, int budget)
{
        struct tc35815_local *lp = container_of(napi, struct tc35815_local, napi);
        struct net_device *dev = lp->dev;
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        int received = 0, handled;
        u32 status;

        spin_lock(&lp->rx_lock);
        status = tc_readl(&tr->Int_Src);
        do {
                /* BLEx, FDAEx will be cleared later */
                tc_writel(status & ~(Int_BLEx | Int_FDAEx),
                          &tr->Int_Src);        /* write to clear */

                handled = tc35815_do_interrupt(dev, status, budget - received);
                if (status & (Int_BLEx | Int_FDAEx))
                        tc_writel(status & (Int_BLEx | Int_FDAEx),
                                  &tr->Int_Src);
                if (handled >= 0) {
                        received += handled;
                        if (received >= budget)
                                break;
                }
                status = tc_readl(&tr->Int_Src);
        } while (status);
        spin_unlock(&lp->rx_lock);

        if (received < budget) {
                napi_complete(napi);
                /* enable interrupts */
                tc_writel(tc_readl(&tr->DMA_Ctl) & ~DMA_IntMask, &tr->DMA_Ctl);
        }
        return received;
}

#define TX_STA_ERR      (Tx_ExColl|Tx_Under|Tx_Defer|Tx_NCarr|Tx_LateColl|Tx_TxPar|Tx_SQErr)

static void
tc35815_check_tx_stat(struct net_device *dev, int status)
{
        struct tc35815_local *lp = netdev_priv(dev);
        const char *msg = NULL;

        /* count collisions */
        if (status & Tx_ExColl)
                dev->stats.collisions += 16;
        if (status & Tx_TxColl_MASK)
                dev->stats.collisions += status & Tx_TxColl_MASK;

        /* TX4939 does not have NCarr */
        if (lp->chiptype == TC35815_TX4939)
                status &= ~Tx_NCarr;
        /* WORKAROUND: ignore LostCrS in full duplex operation */
        if (!lp->link || lp->duplex == DUPLEX_FULL)
                status &= ~Tx_NCarr;

        if (!(status & TX_STA_ERR)) {
                /* no error. */
                dev->stats.tx_packets++;
                return;
        }

        dev->stats.tx_errors++;
        if (status & Tx_ExColl) {
                dev->stats.tx_aborted_errors++;
                msg = "Excessive Collision.";
        }
        if (status & Tx_Under) {
                dev->stats.tx_fifo_errors++;
                msg = "Tx FIFO Underrun.";
                if (lp->lstats.tx_underrun < TX_THRESHOLD_KEEP_LIMIT) {
                        lp->lstats.tx_underrun++;
                        if (lp->lstats.tx_underrun >= TX_THRESHOLD_KEEP_LIMIT) {
                                struct tc35815_regs __iomem *tr =
                                        (struct tc35815_regs __iomem *)dev->base_addr;
                                tc_writel(TX_THRESHOLD_MAX, &tr->TxThrsh);
                                msg = "Tx FIFO Underrun.Change Tx threshold to max.";
                        }
                }
        }
        if (status & Tx_Defer) {
                dev->stats.tx_fifo_errors++;
                msg = "Excessive Deferral.";
        }
        if (status & Tx_NCarr) {
                dev->stats.tx_carrier_errors++;
                msg = "Lost Carrier Sense.";
        }
        if (status & Tx_LateColl) {
                dev->stats.tx_aborted_errors++;
                msg = "Late Collision.";
        }
        if (status & Tx_TxPar) {
                dev->stats.tx_fifo_errors++;
                msg = "Transmit Parity Error.";
        }
        if (status & Tx_SQErr) {
                dev->stats.tx_heartbeat_errors++;
                msg = "Signal Quality Error.";
        }
        if (msg && netif_msg_tx_err(lp))
                printk(KERN_WARNING "%s: %s (%#x)\n", dev->name, msg, status);
}

/* This handles TX complete events posted by the device
 * via interrupts.
 */
static void
tc35815_txdone(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct TxFD *txfd;
        unsigned int fdctl;

        txfd = &lp->tfd_base[lp->tfd_end];
        while (lp->tfd_start != lp->tfd_end &&
               !((fdctl = le32_to_cpu(txfd->fd.FDCtl)) & FD_CownsFD)) {
                int status = le32_to_cpu(txfd->fd.FDStat);
                struct sk_buff *skb;
                unsigned long fdnext = le32_to_cpu(txfd->fd.FDNext);
                u32 fdsystem = le32_to_cpu(txfd->fd.FDSystem);

                if (netif_msg_tx_done(lp)) {
                        printk("%s: complete TxFD.\n", dev->name);
                        dump_txfd(txfd);
                }
                tc35815_check_tx_stat(dev, status);

                skb = fdsystem != 0xffffffff ?
                        lp->tx_skbs[fdsystem].skb : NULL;
#ifdef DEBUG
                if (lp->tx_skbs[lp->tfd_end].skb != skb) {
                        printk("%s: tx_skbs mismatch.\n", dev->name);
                        panic_queues(dev);
                }
#else
                BUG_ON(lp->tx_skbs[lp->tfd_end].skb != skb);
#endif
                if (skb) {
                        dev->stats.tx_bytes += skb->len;
                        pci_unmap_single(lp->pci_dev, lp->tx_skbs[lp->tfd_end].skb_dma, skb->len, PCI_DMA_TODEVICE);
                        lp->tx_skbs[lp->tfd_end].skb = NULL;
                        lp->tx_skbs[lp->tfd_end].skb_dma = 0;
                        dev_kfree_skb_any(skb);
                }
                txfd->fd.FDSystem = cpu_to_le32(0xffffffff);

                lp->tfd_end = (lp->tfd_end + 1) % TX_FD_NUM;
                txfd = &lp->tfd_base[lp->tfd_end];
#ifdef DEBUG
                if ((fdnext & ~FD_Next_EOL) != fd_virt_to_bus(lp, txfd)) {
                        printk("%s: TxFD FDNext invalid.\n", dev->name);
                        panic_queues(dev);
                }
#endif
                if (fdnext & FD_Next_EOL) {
                        /* DMA Transmitter has been stopping... */
                        if (lp->tfd_end != lp->tfd_start) {
                                struct tc35815_regs __iomem *tr =
                                        (struct tc35815_regs __iomem *)dev->base_addr;
                                int head = (lp->tfd_start + TX_FD_NUM - 1) % TX_FD_NUM;
                                struct TxFD *txhead = &lp->tfd_base[head];
                                int qlen = (lp->tfd_start + TX_FD_NUM
                                            - lp->tfd_end) % TX_FD_NUM;

#ifdef DEBUG
                                if (!(le32_to_cpu(txfd->fd.FDCtl) & FD_CownsFD)) {
                                        printk("%s: TxFD FDCtl invalid.\n", dev->name);
                                        panic_queues(dev);
                                }
#endif
                                /* log max queue length */
                                if (lp->lstats.max_tx_qlen < qlen)
                                        lp->lstats.max_tx_qlen = qlen;


                                /* start DMA Transmitter again */
                                txhead->fd.FDNext |= cpu_to_le32(FD_Next_EOL);
                                txhead->fd.FDCtl |= cpu_to_le32(FD_FrmOpt_IntTx);
                                if (netif_msg_tx_queued(lp)) {
                                        printk("%s: start TxFD on queue.\n",
                                               dev->name);
                                        dump_txfd(txfd);
                                }
                                tc_writel(fd_virt_to_bus(lp, txfd), &tr->TxFrmPtr);
                        }
                        break;
                }
        }

        /* If we had stopped the queue due to a "tx full"
         * condition, and space has now been made available,
         * wake up the queue.
         */
        if (netif_queue_stopped(dev) && !tc35815_tx_full(dev))
                netif_wake_queue(dev);
}

/* The inverse routine to tc35815_open(). */
static int
tc35815_close(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);

        netif_stop_queue(dev);
        napi_disable(&lp->napi);
        if (lp->phy_dev)
                phy_stop(lp->phy_dev);
        cancel_work_sync(&lp->restart_work);

        /* Flush the Tx and disable Rx here. */
        tc35815_chip_reset(dev);
        free_irq(dev->irq, dev);

        tc35815_free_queues(dev);

        return 0;

}

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *tc35815_get_stats(struct net_device *dev)
{
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        if (netif_running(dev))
                /* Update the statistics from the device registers. */
                dev->stats.rx_missed_errors += tc_readl(&tr->Miss_Cnt);

        return &dev->stats;
}

static void tc35815_set_cam_entry(struct net_device *dev, int index, unsigned char *addr)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        int cam_index = index * 6;
        u32 cam_data;
        u32 saved_addr;

        saved_addr = tc_readl(&tr->CAM_Adr);

        if (netif_msg_hw(lp))
                printk(KERN_DEBUG "%s: CAM %d: %pM\n",
                        dev->name, index, addr);
        if (index & 1) {
                /* read modify write */
                tc_writel(cam_index - 2, &tr->CAM_Adr);
                cam_data = tc_readl(&tr->CAM_Data) & 0xffff0000;
                cam_data |= addr[0] << 8 | addr[1];
                tc_writel(cam_data, &tr->CAM_Data);
                /* write whole word */
                tc_writel(cam_index + 2, &tr->CAM_Adr);
                cam_data = (addr[2] << 24) | (addr[3] << 16) | (addr[4] << 8) | addr[5];
                tc_writel(cam_data, &tr->CAM_Data);
        } else {
                /* write whole word */
                tc_writel(cam_index, &tr->CAM_Adr);
                cam_data = (addr[0] << 24) | (addr[1] << 16) | (addr[2] << 8) | addr[3];
                tc_writel(cam_data, &tr->CAM_Data);
                /* read modify write */
                tc_writel(cam_index + 4, &tr->CAM_Adr);
                cam_data = tc_readl(&tr->CAM_Data) & 0x0000ffff;
                cam_data |= addr[4] << 24 | (addr[5] << 16);
                tc_writel(cam_data, &tr->CAM_Data);
        }

        tc_writel(saved_addr, &tr->CAM_Adr);
}


/*
 * Set or clear the multicast filter for this adaptor.
 * num_addrs == -1      Promiscuous mode, receive all packets
 * num_addrs == 0       Normal mode, clear multicast list
 * num_addrs > 0        Multicast mode, receive normal and MC packets,
 *                      and do best-effort filtering.
 */
static void
tc35815_set_multicast_list(struct net_device *dev)
{
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;

        if (dev->flags & IFF_PROMISC) {
                /* With some (all?) 100MHalf HUB, controller will hang
                 * if we enabled promiscuous mode before linkup... */
                struct tc35815_local *lp = netdev_priv(dev);

                if (!lp->link)
                        return;
                /* Enable promiscuous mode */
                tc_writel(CAM_CompEn | CAM_BroadAcc | CAM_GroupAcc | CAM_StationAcc, &tr->CAM_Ctl);
        } else if ((dev->flags & IFF_ALLMULTI) ||
                  netdev_mc_count(dev) > CAM_ENTRY_MAX - 3) {
                /* CAM 0, 1, 20 are reserved. */
                /* Disable promiscuous mode, use normal mode. */
                tc_writel(CAM_CompEn | CAM_BroadAcc | CAM_GroupAcc, &tr->CAM_Ctl);
        } else if (!netdev_mc_empty(dev)) {
                struct netdev_hw_addr *ha;
                int i;
                int ena_bits = CAM_Ena_Bit(CAM_ENTRY_SOURCE);

                tc_writel(0, &tr->CAM_Ctl);
                /* Walk the address list, and load the filter */
                i = 0;
                netdev_for_each_mc_addr(ha, dev) {
                        /* entry 0,1 is reserved. */
                        tc35815_set_cam_entry(dev, i + 2, ha->addr);
                        ena_bits |= CAM_Ena_Bit(i + 2);
                        i++;
                }
                tc_writel(ena_bits, &tr->CAM_Ena);
                tc_writel(CAM_CompEn | CAM_BroadAcc, &tr->CAM_Ctl);
        } else {
                tc_writel(CAM_Ena_Bit(CAM_ENTRY_SOURCE), &tr->CAM_Ena);
                tc_writel(CAM_CompEn | CAM_BroadAcc, &tr->CAM_Ctl);
        }
}

static void tc35815_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
        struct tc35815_local *lp = netdev_priv(dev);
        strcpy(info->driver, MODNAME);
        strcpy(info->version, DRV_VERSION);
        strcpy(info->bus_info, pci_name(lp->pci_dev));
}

static int tc35815_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
        struct tc35815_local *lp = netdev_priv(dev);

        if (!lp->phy_dev)
                return -ENODEV;
        return phy_ethtool_gset(lp->phy_dev, cmd);
}

static int tc35815_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
        struct tc35815_local *lp = netdev_priv(dev);

        if (!lp->phy_dev)
                return -ENODEV;
        return phy_ethtool_sset(lp->phy_dev, cmd);
}

static u32 tc35815_get_msglevel(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        return lp->msg_enable;
}

static void tc35815_set_msglevel(struct net_device *dev, u32 datum)
{
        struct tc35815_local *lp = netdev_priv(dev);
        lp->msg_enable = datum;
}

static int tc35815_get_sset_count(struct net_device *dev, int sset)
{
        struct tc35815_local *lp = netdev_priv(dev);

        switch (sset) {
        case ETH_SS_STATS:
                return sizeof(lp->lstats) / sizeof(int);
        default:
                return -EOPNOTSUPP;
        }
}

static void tc35815_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *stats, u64 *data)
{
        struct tc35815_local *lp = netdev_priv(dev);
        data[0] = lp->lstats.max_tx_qlen;
        data[1] = lp->lstats.tx_ints;
        data[2] = lp->lstats.rx_ints;
        data[3] = lp->lstats.tx_underrun;
}

static struct {
        const char str[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
        { "max_tx_qlen" },
        { "tx_ints" },
        { "rx_ints" },
        { "tx_underrun" },
};

static void tc35815_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
        memcpy(data, ethtool_stats_keys, sizeof(ethtool_stats_keys));
}

static const struct ethtool_ops tc35815_ethtool_ops = {
        .get_drvinfo            = tc35815_get_drvinfo,
        .get_settings           = tc35815_get_settings,
        .set_settings           = tc35815_set_settings,
        .get_link               = ethtool_op_get_link,
        .get_msglevel           = tc35815_get_msglevel,
        .set_msglevel           = tc35815_set_msglevel,
        .get_strings            = tc35815_get_strings,
        .get_sset_count         = tc35815_get_sset_count,
        .get_ethtool_stats      = tc35815_get_ethtool_stats,
};

static int tc35815_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct tc35815_local *lp = netdev_priv(dev);

        if (!netif_running(dev))
                return -EINVAL;
        if (!lp->phy_dev)
                return -ENODEV;
        return phy_mii_ioctl(lp->phy_dev, rq, cmd);
}

static void tc35815_chip_reset(struct net_device *dev)
{
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        int i;
        /* reset the controller */
        tc_writel(MAC_Reset, &tr->MAC_Ctl);
        udelay(4); /* 3200ns */
        i = 0;
        while (tc_readl(&tr->MAC_Ctl) & MAC_Reset) {
                if (i++ > 100) {
                        printk(KERN_ERR "%s: MAC reset failed.\n", dev->name);
                        break;
                }
                mdelay(1);
        }
        tc_writel(0, &tr->MAC_Ctl);

        /* initialize registers to default value */
        tc_writel(0, &tr->DMA_Ctl);
        tc_writel(0, &tr->TxThrsh);
        tc_writel(0, &tr->TxPollCtr);
        tc_writel(0, &tr->RxFragSize);
        tc_writel(0, &tr->Int_En);
        tc_writel(0, &tr->FDA_Bas);
        tc_writel(0, &tr->FDA_Lim);
        tc_writel(0xffffffff, &tr->Int_Src);    /* Write 1 to clear */
        tc_writel(0, &tr->CAM_Ctl);
        tc_writel(0, &tr->Tx_Ctl);
        tc_writel(0, &tr->Rx_Ctl);
        tc_writel(0, &tr->CAM_Ena);
        (void)tc_readl(&tr->Miss_Cnt);  /* Read to clear */

        /* initialize internal SRAM */
        tc_writel(DMA_TestMode, &tr->DMA_Ctl);
        for (i = 0; i < 0x1000; i += 4) {
                tc_writel(i, &tr->CAM_Adr);
                tc_writel(0, &tr->CAM_Data);
        }
        tc_writel(0, &tr->DMA_Ctl);
}

static void tc35815_chip_init(struct net_device *dev)
{
        struct tc35815_local *lp = netdev_priv(dev);
        struct tc35815_regs __iomem *tr =
                (struct tc35815_regs __iomem *)dev->base_addr;
        unsigned long txctl = TX_CTL_CMD;

        /* load station address to CAM */
        tc35815_set_cam_entry(dev, CAM_ENTRY_SOURCE, dev->dev_addr);

        /* Enable CAM (broadcast and unicast) */
        tc_writel(CAM_Ena_Bit(CAM_ENTRY_SOURCE), &tr->CAM_Ena);
        tc_writel(CAM_CompEn | CAM_BroadAcc, &tr->CAM_Ctl);

        /* Use DMA_RxAlign_2 to make IP header 4-byte aligned. */
        if (HAVE_DMA_RXALIGN(lp))
                tc_writel(DMA_BURST_SIZE | DMA_RxAlign_2, &tr->DMA_Ctl);
        else
                tc_writel(DMA_BURST_SIZE, &tr->DMA_Ctl);
        tc_writel(0, &tr->TxPollCtr);   /* Batch mode */
        tc_writel(TX_THRESHOLD, &tr->TxThrsh);
        tc_writel(INT_EN_CMD, &tr->Int_En);

        /* set queues */
        tc_writel(fd_virt_to_bus(lp, lp->rfd_base), &tr->FDA_Bas);
        tc_writel((unsigned long)lp->rfd_limit - (unsigned long)lp->rfd_base,
                  &tr->FDA_Lim);
        /*
         * Activation method:
         * First, enable the MAC Transmitter and the DMA Receive circuits.
         * Then enable the DMA Transmitter and the MAC Receive circuits.
         */
        tc_writel(fd_virt_to_bus(lp, lp->fbl_ptr), &tr->BLFrmPtr);      /* start DMA receiver */
        tc_writel(RX_CTL_CMD, &tr->Rx_Ctl);     /* start MAC receiver */

        /* start MAC transmitter */
        /* TX4939 does not have EnLCarr */
        if (lp->chiptype == TC35815_TX4939)
                txctl &= ~Tx_EnLCarr;
        /* WORKAROUND: ignore LostCrS in full duplex operation */
        if (!lp->phy_dev || !lp->link || lp->duplex == DUPLEX_FULL)
                txctl &= ~Tx_EnLCarr;
        tc_writel(txctl, &tr->Tx_Ctl);
}

#ifdef CONFIG_PM
static int tc35815_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct net_device *dev = pci_get_drvdata(pdev);
        struct tc35815_local *lp = netdev_priv(dev);
        unsigned long flags;

        pci_save_state(pdev);
        if (!netif_running(dev))
                return 0;
        netif_device_detach(dev);
        if (lp->phy_dev)
                phy_stop(lp->phy_dev);
        spin_lock_irqsave(&lp->lock, flags);
        tc35815_chip_reset(dev);
        spin_unlock_irqrestore(&lp->lock, flags);
        pci_set_power_state(pdev, PCI_D3hot);
        return 0;
}

static int tc35815_resume(struct pci_dev *pdev)
{
        struct net_device *dev = pci_get_drvdata(pdev);
        struct tc35815_local *lp = netdev_priv(dev);

        pci_restore_state(pdev);
        if (!netif_running(dev))
                return 0;
        pci_set_power_state(pdev, PCI_D0);
        tc35815_restart(dev);
        netif_carrier_off(dev);
        if (lp->phy_dev)
                phy_start(lp->phy_dev);
        netif_device_attach(dev);
        return 0;
}
#endif /* CONFIG_PM */

static struct pci_driver tc35815_pci_driver = {
        .name           = MODNAME,
        .id_table       = tc35815_pci_tbl,
        .probe          = tc35815_init_one,
        .remove         = __devexit_p(tc35815_remove_one),
#ifdef CONFIG_PM
        .suspend        = tc35815_suspend,
        .resume         = tc35815_resume,
#endif
};

module_param_named(speed, options.speed, int, 0);
MODULE_PARM_DESC(speed, "0:auto, 10:10Mbps, 100:100Mbps");
module_param_named(duplex, options.duplex, int, 0);
MODULE_PARM_DESC(duplex, "0:auto, 1:half, 2:full");

static int __init tc35815_init_module(void)
{
        return pci_register_driver(&tc35815_pci_driver);
}

static void __exit tc35815_cleanup_module(void)
{
        pci_unregister_driver(&tc35815_pci_driver);
}

module_init(tc35815_init_module);
module_exit(tc35815_cleanup_module);

MODULE_DESCRIPTION("TOSHIBA TC35815 PCI 10M/100M Ethernet driver");
MODULE_LICENSE("GPL");