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[linux-2.6.9-moxart.git] / drivers / net / via-rhine.c

/* via-rhine.c: A Linux Ethernet device driver for VIA Rhine family chips. */
/*
        Written 1998-2001 by Donald Becker.

        Current Maintainer: Roger Luethi <rl@hellgate.ch>

        This software may be used and distributed according to the terms of
        the GNU General Public License (GPL), incorporated herein by reference.
        Drivers based on or derived from this code fall under the GPL and must
        retain the authorship, copyright and license notice.  This file is not
        a complete program and may only be used when the entire operating
        system is licensed under the GPL.

        This driver is designed for the VIA VT86C100A Rhine-I.
        It also works with the Rhine-II (6102) and Rhine-III (6105/6105L/6105LOM
        and management NIC 6105M).

        The author may be reached as becker@scyld.com, or C/O
        Scyld Computing Corporation
        410 Severn Ave., Suite 210
        Annapolis MD 21403


        This driver contains some changes from the original Donald Becker
        version. He may or may not be interested in bug reports on this
        code. You can find his versions at:
        http://www.scyld.com/network/via-rhine.html


        Linux kernel version history:

        LK1.1.0:
        - Jeff Garzik: softnet 'n stuff

        LK1.1.1:
        - Justin Guyett: softnet and locking fixes
        - Jeff Garzik: use PCI interface

        LK1.1.2:
        - Urban Widmark: minor cleanups, merges from Becker 1.03a/1.04 versions

        LK1.1.3:
        - Urban Widmark: use PCI DMA interface (with thanks to the eepro100.c
                         code) update "Theory of Operation" with
                         softnet/locking changes
        - Dave Miller: PCI DMA and endian fixups
        - Jeff Garzik: MOD_xxx race fixes, updated PCI resource allocation

        LK1.1.4:
        - Urban Widmark: fix gcc 2.95.2 problem and
                         remove writel's to fixed address 0x7c

        LK1.1.5:
        - Urban Widmark: mdio locking, bounce buffer changes
                         merges from Beckers 1.05 version
                         added netif_running_on/off support

        LK1.1.6:
        - Urban Widmark: merges from Beckers 1.08b version (VT6102 + mdio)
                         set netif_running_on/off on startup, del_timer_sync

        LK1.1.7:
        - Manfred Spraul: added reset into tx_timeout

        LK1.1.9:
        - Urban Widmark: merges from Beckers 1.10 version
                         (media selection + eeprom reload)
        - David Vrabel:  merges from D-Link "1.11" version
                         (disable WOL and PME on startup)

        LK1.1.10:
        - Manfred Spraul: use "singlecopy" for unaligned buffers
                          don't allocate bounce buffers for !ReqTxAlign cards

        LK1.1.11:
        - David Woodhouse: Set dev->base_addr before the first time we call
                           wait_for_reset(). It's a lot happier that way.
                           Free np->tx_bufs only if we actually allocated it.

        LK1.1.12:
        - Martin Eriksson: Allow Memory-Mapped IO to be enabled.

        LK1.1.13 (jgarzik):
        - Add ethtool support
        - Replace some MII-related magic numbers with constants

        LK1.1.14 (Ivan G.):
        - fixes comments for Rhine-III
        - removes W_MAX_TIMEOUT (unused)
        - adds HasDavicomPhy for Rhine-I (basis: linuxfet driver; my card
          is R-I and has Davicom chip, flag is referenced in kernel driver)
        - sends chip_id as a parameter to wait_for_reset since np is not
          initialized on first call
        - changes mmio "else if (chip_id==VT6102)" to "else" so it will work
          for Rhine-III's (documentation says same bit is correct)
        - transmit frame queue message is off by one - fixed
        - adds IntrNormalSummary to "Something Wicked" exclusion list
          so normal interrupts will not trigger the message (src: Donald Becker)
        (Roger Luethi)
        - show confused chip where to continue after Tx error
        - location of collision counter is chip specific
        - allow selecting backoff algorithm (module parameter)

        LK1.1.15 (jgarzik):
        - Use new MII lib helper generic_mii_ioctl

        LK1.1.16 (Roger Luethi)
        - Etherleak fix
        - Handle Tx buffer underrun
        - Fix bugs in full duplex handling
        - New reset code uses "force reset" cmd on Rhine-II
        - Various clean ups

        LK1.1.17 (Roger Luethi)
        - Fix race in via_rhine_start_tx()
        - On errors, wait for Tx engine to turn off before scavenging
        - Handle Tx descriptor write-back race on Rhine-II
        - Force flushing for PCI posted writes
        - More reset code changes

        LK1.1.18 (Roger Luethi)
        - No filtering multicast in promisc mode (Edward Peng)
        - Fix for Rhine-I Tx timeouts

        LK1.1.19 (Roger Luethi)
        - Increase Tx threshold for unspecified errors

        LK1.2.0-2.6 (Roger Luethi)
        - Massive clean-up
        - Rewrite PHY, media handling (remove options, full_duplex, backoff)
        - Fix Tx engine race for good

*/

#define DRV_NAME        "via-rhine"
#define DRV_VERSION     "1.2.0-2.6"
#define DRV_RELDATE     "June-10-2004"


/* A few user-configurable values.
   These may be modified when a driver module is loaded. */

static int debug = 1;   /* 1 normal messages, 0 quiet .. 7 verbose. */
static int max_interrupt_work = 20;

/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
   Setting to > 1518 effectively disables this feature. */
static int rx_copybreak;

/*
 * In case you are looking for 'options[]' or 'full_duplex[]', they
 * are gone. Use ethtool(8) instead.
 */

/* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
   The Rhine has a 64 element 8390-like hash table. */
static const int multicast_filter_limit = 32;


/* Operational parameters that are set at compile time. */

/* Keep the ring sizes a power of two for compile efficiency.
   The compiler will convert <unsigned>'%'<2^N> into a bit mask.
   Making the Tx ring too large decreases the effectiveness of channel
   bonding and packet priority.
   There are no ill effects from too-large receive rings. */
#define TX_RING_SIZE    16
#define TX_QUEUE_LEN    10      /* Limit ring entries actually used. */
#define RX_RING_SIZE    16


/* Operational parameters that usually are not changed. */

/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT      (2*HZ)

#define PKT_BUF_SZ      1536    /* Size of each temporary Rx buffer.*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <asm/processor.h>      /* Processor type for cache alignment. */
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

/* These identify the driver base version and may not be removed. */
static char version[] __devinitdata =
KERN_INFO DRV_NAME ".c:v1.10-LK" DRV_VERSION " " DRV_RELDATE " Written by Donald Becker\n";

/* This driver was written to use PCI memory space. Some early versions
   of the Rhine may only work correctly with I/O space accesses. */
#ifdef CONFIG_VIA_RHINE_MMIO
#define USE_MMIO
#else
#undef readb
#undef readw
#undef readl
#undef writeb
#undef writew
#undef writel
#define readb inb
#define readw inw
#define readl inl
#define writeb outb
#define writew outw
#define writel outl
#endif

MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
MODULE_DESCRIPTION("VIA Rhine PCI Fast Ethernet driver");
MODULE_LICENSE("GPL");

MODULE_PARM(max_interrupt_work, "i");
MODULE_PARM(debug, "i");
MODULE_PARM(rx_copybreak, "i");
MODULE_PARM_DESC(max_interrupt_work, "VIA Rhine maximum events handled per interrupt");
MODULE_PARM_DESC(debug, "VIA Rhine debug level (0-7)");
MODULE_PARM_DESC(rx_copybreak, "VIA Rhine copy breakpoint for copy-only-tiny-frames");

/*
                Theory of Operation

I. Board Compatibility

This driver is designed for the VIA 86c100A Rhine-II PCI Fast Ethernet
controller.

II. Board-specific settings

Boards with this chip are functional only in a bus-master PCI slot.

Many operational settings are loaded from the EEPROM to the Config word at
offset 0x78. For most of these settings, this driver assumes that they are
correct.
If this driver is compiled to use PCI memory space operations the EEPROM
must be configured to enable memory ops.

III. Driver operation

IIIa. Ring buffers

This driver uses two statically allocated fixed-size descriptor lists
formed into rings by a branch from the final descriptor to the beginning of
the list. The ring sizes are set at compile time by RX/TX_RING_SIZE.

IIIb/c. Transmit/Receive Structure

This driver attempts to use a zero-copy receive and transmit scheme.

Alas, all data buffers are required to start on a 32 bit boundary, so
the driver must often copy transmit packets into bounce buffers.

The driver allocates full frame size skbuffs for the Rx ring buffers at
open() time and passes the skb->data field to the chip as receive data
buffers. When an incoming frame is less than RX_COPYBREAK bytes long,
a fresh skbuff is allocated and the frame is copied to the new skbuff.
When the incoming frame is larger, the skbuff is passed directly up the
protocol stack. Buffers consumed this way are replaced by newly allocated
skbuffs in the last phase of rhine_rx().

The RX_COPYBREAK value is chosen to trade-off the memory wasted by
using a full-sized skbuff for small frames vs. the copying costs of larger
frames. New boards are typically used in generously configured machines
and the underfilled buffers have negligible impact compared to the benefit of
a single allocation size, so the default value of zero results in never
copying packets. When copying is done, the cost is usually mitigated by using
a combined copy/checksum routine. Copying also preloads the cache, which is
most useful with small frames.

Since the VIA chips are only able to transfer data to buffers on 32 bit
boundaries, the IP header at offset 14 in an ethernet frame isn't
longword aligned for further processing. Copying these unaligned buffers
has the beneficial effect of 16-byte aligning the IP header.

IIId. Synchronization

The driver runs as two independent, single-threaded flows of control. One
is the send-packet routine, which enforces single-threaded use by the
dev->priv->lock spinlock. The other thread is the interrupt handler, which
is single threaded by the hardware and interrupt handling software.

The send packet thread has partial control over the Tx ring. It locks the
dev->priv->lock whenever it's queuing a Tx packet. If the next slot in the ring
is not available it stops the transmit queue by calling netif_stop_queue.

The interrupt handler has exclusive control over the Rx ring and records stats
from the Tx ring. After reaping the stats, it marks the Tx queue entry as
empty by incrementing the dirty_tx mark. If at least half of the entries in
the Rx ring are available the transmit queue is woken up if it was stopped.

IV. Notes

IVb. References

Preliminary VT86C100A manual from http://www.via.com.tw/
http://www.scyld.com/expert/100mbps.html
http://www.scyld.com/expert/NWay.html
ftp://ftp.via.com.tw/public/lan/Products/NIC/VT86C100A/Datasheet/VT86C100A03.pdf
ftp://ftp.via.com.tw/public/lan/Products/NIC/VT6102/Datasheet/VT6102_021.PDF


IVc. Errata

The VT86C100A manual is not reliable information.
The 3043 chip does not handle unaligned transmit or receive buffers, resulting
in significant performance degradation for bounce buffer copies on transmit
and unaligned IP headers on receive.
The chip does not pad to minimum transmit length.

*/


/* This table drives the PCI probe routines. It's mostly boilerplate in all
   of the drivers, and will likely be provided by some future kernel.
   Note the matching code -- the first table entry matchs all 56** cards but
   second only the 1234 card.
*/

enum rhine_revs {
        VT86C100A       = 0x00,
        VTunknown0      = 0x20,
        VT6102          = 0x40,
        VT8231          = 0x50, /* Integrated MAC */
        VT8233          = 0x60, /* Integrated MAC */
        VT8235          = 0x74, /* Integrated MAC */
        VT8237          = 0x78, /* Integrated MAC */
        VTunknown1      = 0x7C,
        VT6105          = 0x80,
        VT6105_B0       = 0x83,
        VT6105L         = 0x8A,
        VT6107          = 0x8C,
        VTunknown2      = 0x8E,
        VT6105M         = 0x90, /* Management adapter */
};

enum rhine_quirks {
        rqWOL           = 0x0001,       /* Wake-On-LAN support */
        rqForceReset    = 0x0002,
        rq6patterns     = 0x0040,       /* 6 instead of 4 patterns for WOL */
        rqStatusWBRace  = 0x0080,       /* Tx Status Writeback Error possible */
        rqRhineI        = 0x0100,       /* See comment below */
};
/*
 * rqRhineI: VT86C100A (aka Rhine-I) uses different bits to enable
 * MMIO as well as for the collision counter and the Tx FIFO underflow
 * indicator. In addition, Tx and Rx buffers need to 4 byte aligned.
 */

/* Beware of PCI posted writes */
#define IOSYNC  do { readb(dev->base_addr + StationAddr); } while (0)

static struct pci_device_id rhine_pci_tbl[] =
{
        {0x1106, 0x3043, PCI_ANY_ID, PCI_ANY_ID, 0, 0, }, /* VT86C100A */
        {0x1106, 0x3065, PCI_ANY_ID, PCI_ANY_ID, 0, 0, }, /* VT6102 */
        {0x1106, 0x3106, PCI_ANY_ID, PCI_ANY_ID, 0, 0, }, /* 6105{,L,LOM} */
        {0x1106, 0x3053, PCI_ANY_ID, PCI_ANY_ID, 0, 0, }, /* VT6105M */
        { }     /* terminate list */
};
MODULE_DEVICE_TABLE(pci, rhine_pci_tbl);


/* Offsets to the device registers. */
enum register_offsets {
        StationAddr=0x00, RxConfig=0x06, TxConfig=0x07, ChipCmd=0x08,
        ChipCmd1=0x09,
        IntrStatus=0x0C, IntrEnable=0x0E,
        MulticastFilter0=0x10, MulticastFilter1=0x14,
        RxRingPtr=0x18, TxRingPtr=0x1C, GFIFOTest=0x54,
        MIIPhyAddr=0x6C, MIIStatus=0x6D, PCIBusConfig=0x6E,
        MIICmd=0x70, MIIRegAddr=0x71, MIIData=0x72, MACRegEEcsr=0x74,
        ConfigA=0x78, ConfigB=0x79, ConfigC=0x7A, ConfigD=0x7B,
        RxMissed=0x7C, RxCRCErrs=0x7E, MiscCmd=0x81,
        StickyHW=0x83, IntrStatus2=0x84,
        WOLcrSet=0xA0, PwcfgSet=0xA1, WOLcgSet=0xA3, WOLcrClr=0xA4,
        WOLcrClr1=0xA6, WOLcgClr=0xA7,
        PwrcsrSet=0xA8, PwrcsrSet1=0xA9, PwrcsrClr=0xAC, PwrcsrClr1=0xAD,
};

/* Bits in ConfigD */
enum backoff_bits {
        BackOptional=0x01, BackModify=0x02,
        BackCaptureEffect=0x04, BackRandom=0x08
};

#ifdef USE_MMIO
/* Registers we check that mmio and reg are the same. */
int mmio_verify_registers[] = {
        RxConfig, TxConfig, IntrEnable, ConfigA, ConfigB, ConfigC, ConfigD,
        0
};
#endif

/* Bits in the interrupt status/mask registers. */
enum intr_status_bits {
        IntrRxDone=0x0001, IntrRxErr=0x0004, IntrRxEmpty=0x0020,
        IntrTxDone=0x0002, IntrTxError=0x0008, IntrTxUnderrun=0x0210,
        IntrPCIErr=0x0040,
        IntrStatsMax=0x0080, IntrRxEarly=0x0100,
        IntrRxOverflow=0x0400, IntrRxDropped=0x0800, IntrRxNoBuf=0x1000,
        IntrTxAborted=0x2000, IntrLinkChange=0x4000,
        IntrRxWakeUp=0x8000,
        IntrNormalSummary=0x0003, IntrAbnormalSummary=0xC260,
        IntrTxDescRace=0x080000,        /* mapped from IntrStatus2 */
        IntrTxErrSummary=0x082218,
};

/* Bits in WOLcrSet/WOLcrClr and PwrcsrSet/PwrcsrClr */
enum wol_bits {
        WOLucast        = 0x10,
        WOLmagic        = 0x20,
        WOLbmcast       = 0x30,
        WOLlnkon        = 0x40,
        WOLlnkoff       = 0x80,
};

/* The Rx and Tx buffer descriptors. */
struct rx_desc {
        s32 rx_status;
        u32 desc_length; /* Chain flag, Buffer/frame length */
        u32 addr;
        u32 next_desc;
};
struct tx_desc {
        s32 tx_status;
        u32 desc_length; /* Chain flag, Tx Config, Frame length */
        u32 addr;
        u32 next_desc;
};

/* Initial value for tx_desc.desc_length, Buffer size goes to bits 0-10 */
#define TXDESC          0x00e08000

enum rx_status_bits {
        RxOK=0x8000, RxWholePkt=0x0300, RxErr=0x008F
};

/* Bits in *_desc.*_status */
enum desc_status_bits {
        DescOwn=0x80000000
};

/* Bits in ChipCmd. */
enum chip_cmd_bits {
        CmdInit=0x01, CmdStart=0x02, CmdStop=0x04, CmdRxOn=0x08,
        CmdTxOn=0x10, Cmd1TxDemand=0x20, CmdRxDemand=0x40,
        Cmd1EarlyRx=0x01, Cmd1EarlyTx=0x02, Cmd1FDuplex=0x04,
        Cmd1NoTxPoll=0x08, Cmd1Reset=0x80,
};

struct rhine_private {
        /* Descriptor rings */
        struct rx_desc *rx_ring;
        struct tx_desc *tx_ring;
        dma_addr_t rx_ring_dma;
        dma_addr_t tx_ring_dma;

        /* The addresses of receive-in-place skbuffs. */
        struct sk_buff *rx_skbuff[RX_RING_SIZE];
        dma_addr_t rx_skbuff_dma[RX_RING_SIZE];

        /* The saved address of a sent-in-place packet/buffer, for later free(). */
        struct sk_buff *tx_skbuff[TX_RING_SIZE];
        dma_addr_t tx_skbuff_dma[TX_RING_SIZE];

        /* Tx bounce buffers */
        unsigned char *tx_buf[TX_RING_SIZE];
        unsigned char *tx_bufs;
        dma_addr_t tx_bufs_dma;

        struct pci_dev *pdev;
        long pioaddr;
        struct net_device_stats stats;
        spinlock_t lock;

        /* Frequently used values: keep some adjacent for cache effect. */
        u32 quirks;
        struct rx_desc *rx_head_desc;
        unsigned int cur_rx, dirty_rx;  /* Producer/consumer ring indices */
        unsigned int cur_tx, dirty_tx;
        unsigned int rx_buf_sz;         /* Based on MTU+slack. */
        u8 wolopts;

        u8 tx_thresh, rx_thresh;

        struct mii_if_info mii_if;
};

static int  mdio_read(struct net_device *dev, int phy_id, int location);
static void mdio_write(struct net_device *dev, int phy_id, int location, int value);
static int  rhine_open(struct net_device *dev);
static void rhine_tx_timeout(struct net_device *dev);
static int  rhine_start_tx(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t rhine_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
static void rhine_tx(struct net_device *dev);
static void rhine_rx(struct net_device *dev);
static void rhine_error(struct net_device *dev, int intr_status);
static void rhine_set_rx_mode(struct net_device *dev);
static struct net_device_stats *rhine_get_stats(struct net_device *dev);
static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static struct ethtool_ops netdev_ethtool_ops;
static int  rhine_close(struct net_device *dev);
static void rhine_shutdown (struct device *gdev);

#define RHINE_WAIT_FOR(condition) do {                                  \
        int i=1024;                                                     \
        while (!(condition) && --i)                                     \
                ;                                                       \
        if (debug > 1 && i < 512)                                       \
                printk(KERN_INFO "%s: %4d cycles used @ %s:%d\n",       \
                                DRV_NAME, 1024-i, __func__, __LINE__);  \
} while(0)

static inline u32 get_intr_status(struct net_device *dev)
{
        long ioaddr = dev->base_addr;
        struct rhine_private *rp = netdev_priv(dev);
        u32 intr_status;

        intr_status = readw(ioaddr + IntrStatus);
        /* On Rhine-II, Bit 3 indicates Tx descriptor write-back race. */
        if (rp->quirks & rqStatusWBRace)
                intr_status |= readb(ioaddr + IntrStatus2) << 16;
        return intr_status;
}

/*
 * Get power related registers into sane state.
 * Notify user about past WOL event.
 */
static void rhine_power_init(struct net_device *dev)
{
        long ioaddr = dev->base_addr;
        struct rhine_private *rp = netdev_priv(dev);
        u16 wolstat;

        if (rp->quirks & rqWOL) {
                /* Make sure chip is in power state D0 */
                writeb(readb(ioaddr + StickyHW) & 0xFC, ioaddr + StickyHW);

                /* Disable "force PME-enable" */
                writeb(0x80, ioaddr + WOLcgClr);

                /* Clear power-event config bits (WOL) */
                writeb(0xFF, ioaddr + WOLcrClr);
                /* More recent cards can manage two additional patterns */
                if (rp->quirks & rq6patterns)
                        writeb(0x03, ioaddr + WOLcrClr1);

                /* Save power-event status bits */
                wolstat = readb(ioaddr + PwrcsrSet);
                if (rp->quirks & rq6patterns)
                        wolstat |= (readb(ioaddr + PwrcsrSet1) & 0x03) << 8;

                /* Clear power-event status bits */
                writeb(0xFF, ioaddr + PwrcsrClr);
                if (rp->quirks & rq6patterns)
                        writeb(0x03, ioaddr + PwrcsrClr1);

                if (wolstat) {
                        char *reason;
                        switch (wolstat) {
                        case WOLmagic:
                                reason = "Magic packet";
                                break;
                        case WOLlnkon:
                                reason = "Link went up";
                                break;
                        case WOLlnkoff:
                                reason = "Link went down";
                                break;
                        case WOLucast:
                                reason = "Unicast packet";
                                break;
                        case WOLbmcast:
                                reason = "Multicast/broadcast packet";
                                break;
                        default:
                                reason = "Unknown";
                        }
                        printk(KERN_INFO "%s: Woke system up. Reason: %s.\n",
                               DRV_NAME, reason);
                }
        }
}

static void rhine_chip_reset(struct net_device *dev)
{
        long ioaddr = dev->base_addr;
        struct rhine_private *rp = netdev_priv(dev);

        writeb(Cmd1Reset, ioaddr + ChipCmd1);
        IOSYNC;

        if (readb(ioaddr + ChipCmd1) & Cmd1Reset) {
                printk(KERN_INFO "%s: Reset not complete yet. "
                        "Trying harder.\n", DRV_NAME);

                /* Force reset */
                if (rp->quirks & rqForceReset)
                        writeb(0x40, ioaddr + MiscCmd);

                /* Reset can take somewhat longer (rare) */
                RHINE_WAIT_FOR(!(readb(ioaddr + ChipCmd1) & Cmd1Reset));
        }

        if (debug > 1)
                printk(KERN_INFO "%s: Reset %s.\n", dev->name,
                        (readb(ioaddr + ChipCmd1) & Cmd1Reset) ?
                        "failed" : "succeeded");
}

#ifdef USE_MMIO
static void __devinit enable_mmio(long pioaddr, u32 quirks)
{
        int n;
        if (quirks & rqRhineI) {
                /* More recent docs say that this bit is reserved ... */
                n = inb(pioaddr + ConfigA) | 0x20;
                outb(n, pioaddr + ConfigA);
        } else {
                n = inb(pioaddr + ConfigD) | 0x80;
                outb(n, pioaddr + ConfigD);
        }
}
#endif

/*
 * Loads bytes 0x00-0x05, 0x6E-0x6F, 0x78-0x7B from EEPROM
 * (plus 0x6C for Rhine-I/II)
 */
static void __devinit rhine_reload_eeprom(long pioaddr, struct net_device *dev)
{
        long ioaddr = dev->base_addr;
        struct rhine_private *rp = netdev_priv(dev);

        outb(0x20, pioaddr + MACRegEEcsr);
        RHINE_WAIT_FOR(!(inb(pioaddr + MACRegEEcsr) & 0x20));

#ifdef USE_MMIO
        /*
         * Reloading from EEPROM overwrites ConfigA-D, so we must re-enable
         * MMIO. If reloading EEPROM was done first this could be avoided, but
         * it is not known if that still works with the "win98-reboot" problem.
         */
        enable_mmio(pioaddr, rp->quirks);
#endif

        /* Turn off EEPROM-controlled wake-up (magic packet) */
        if (rp->quirks & rqWOL)
                writeb(readb(ioaddr + ConfigA) & 0xFE, ioaddr + ConfigA);

}

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

static void rhine_hw_init(struct net_device *dev, long pioaddr)
{
        struct rhine_private *rp = netdev_priv(dev);

        /* Reset the chip to erase previous misconfiguration. */
        rhine_chip_reset(dev);

        /* Rhine-I needs extra time to recuperate before EEPROM reload */
        if (rp->quirks & rqRhineI)
                msleep(5);

        /* Reload EEPROM controlled bytes cleared by soft reset */
        rhine_reload_eeprom(pioaddr, dev);
}

static int __devinit rhine_init_one(struct pci_dev *pdev,
                                    const struct pci_device_id *ent)
{
        struct net_device *dev;
        struct rhine_private *rp;
        int i, rc;
        u8 pci_rev;
        u32 quirks;
        long pioaddr;
        long memaddr;
        long ioaddr;
        int io_size, phy_id;
        const char *name;

/* when built into the kernel, we only print version if device is found */
#ifndef MODULE
        static int printed_version;
        if (!printed_version++)
                printk(version);
#endif

        pci_read_config_byte(pdev, PCI_REVISION_ID, &pci_rev);

        io_size = 256;
        phy_id = 0;
        quirks = 0;
        name = "Rhine";
        if (pci_rev < VTunknown0) {
                quirks = rqRhineI;
                io_size = 128;
        }
        else if (pci_rev >= VT6102) {
                quirks = rqWOL | rqForceReset;
                if (pci_rev < VT6105) {
                        name = "Rhine II";
                        quirks |= rqStatusWBRace;       /* Rhine-II exclusive */
                }
                else {
                        phy_id = 1;     /* Integrated PHY, phy_id fixed to 1 */
                        if (pci_rev >= VT6105_B0)
                                quirks |= rq6patterns;
                        if (pci_rev < VT6105M)
                                name = "Rhine III";
                        else
                                name = "Rhine III (Management Adapter)";
                }
        }

        rc = pci_enable_device(pdev);
        if (rc)
                goto err_out;

        /* this should always be supported */
        rc = pci_set_dma_mask(pdev, 0xffffffff);
        if (rc) {
                printk(KERN_ERR "32-bit PCI DMA addresses not supported by "
                       "the card!?\n");
                goto err_out;
        }

        /* sanity check */
        if ((pci_resource_len(pdev, 0) < io_size) ||
            (pci_resource_len(pdev, 1) < io_size)) {
                rc = -EIO;
                printk(KERN_ERR "Insufficient PCI resources, aborting\n");
                goto err_out;
        }

        pioaddr = pci_resource_start(pdev, 0);
        memaddr = pci_resource_start(pdev, 1);

        pci_set_master(pdev);

        dev = alloc_etherdev(sizeof(struct rhine_private));
        if (!dev) {
                rc = -ENOMEM;
                printk(KERN_ERR "alloc_etherdev failed\n");
                goto err_out;
        }
        SET_MODULE_OWNER(dev);
        SET_NETDEV_DEV(dev, &pdev->dev);

        rp = netdev_priv(dev);
        rp->quirks = quirks;
        rp->pioaddr = pioaddr;
        rp->pdev = pdev;

        rc = pci_request_regions(pdev, DRV_NAME);
        if (rc)
                goto err_out_free_netdev;

#ifdef USE_MMIO
        enable_mmio(pioaddr, quirks);

        ioaddr = (long) ioremap(memaddr, io_size);
        if (!ioaddr) {
                rc = -EIO;
                printk(KERN_ERR "ioremap failed for device %s, region 0x%X "
                       "@ 0x%lX\n", pci_name(pdev), io_size, memaddr);
                goto err_out_free_res;
        }

        /* Check that selected MMIO registers match the PIO ones */
        i = 0;
        while (mmio_verify_registers[i]) {
                int reg = mmio_verify_registers[i++];
                unsigned char a = inb(pioaddr+reg);
                unsigned char b = readb(ioaddr+reg);
                if (a != b) {
                        rc = -EIO;
                        printk(KERN_ERR "MMIO do not match PIO [%02x] "
                               "(%02x != %02x)\n", reg, a, b);
                        goto err_out_unmap;
                }
        }
#else
        ioaddr = pioaddr;
#endif /* USE_MMIO */

        dev->base_addr = ioaddr;

        /* Get chip registers into a sane state */
        rhine_power_init(dev);
        rhine_hw_init(dev, pioaddr);

        for (i = 0; i < 6; i++)
                dev->dev_addr[i] = readb(ioaddr + StationAddr + i);

        if (!is_valid_ether_addr(dev->dev_addr)) {
                rc = -EIO;
                printk(KERN_ERR "Invalid MAC address\n");
                goto err_out_unmap;
        }

        /* For Rhine-I/II, phy_id is loaded from EEPROM */
        if (!phy_id)
                phy_id = readb(ioaddr + 0x6C);

        dev->irq = pdev->irq;

        spin_lock_init(&rp->lock);
        rp->mii_if.dev = dev;
        rp->mii_if.mdio_read = mdio_read;
        rp->mii_if.mdio_write = mdio_write;
        rp->mii_if.phy_id_mask = 0x1f;
        rp->mii_if.reg_num_mask = 0x1f;

        /* The chip-specific entries in the device structure. */
        dev->open = rhine_open;
        dev->hard_start_xmit = rhine_start_tx;
        dev->stop = rhine_close;
        dev->get_stats = rhine_get_stats;
        dev->set_multicast_list = rhine_set_rx_mode;
        dev->do_ioctl = netdev_ioctl;
        dev->ethtool_ops = &netdev_ethtool_ops;
        dev->tx_timeout = rhine_tx_timeout;
        dev->watchdog_timeo = TX_TIMEOUT;
#ifdef CONFIG_NET_POLL_CONTROLLER
        dev->poll_controller = rhine_poll;
#endif
        if (rp->quirks & rqRhineI)
                dev->features |= NETIF_F_SG|NETIF_F_HW_CSUM;

        /* dev->name not defined before register_netdev()! */
        rc = register_netdev(dev);
        if (rc)
                goto err_out_unmap;

        printk(KERN_INFO "%s: VIA %s at 0x%lx, ",
               dev->name, name,
#ifdef USE_MMIO
                memaddr
#else
                ioaddr
#endif
                 );

        for (i = 0; i < 5; i++)
                printk("%2.2x:", dev->dev_addr[i]);
        printk("%2.2x, IRQ %d.\n", dev->dev_addr[i], pdev->irq);

        pci_set_drvdata(pdev, dev);

        {
                u16 mii_cmd;
                int mii_status = mdio_read(dev, phy_id, 1);
                mii_cmd = mdio_read(dev, phy_id, MII_BMCR) & ~BMCR_ISOLATE;
                mdio_write(dev, phy_id, MII_BMCR, mii_cmd);
                if (mii_status != 0xffff && mii_status != 0x0000) {
                        rp->mii_if.advertising = mdio_read(dev, phy_id, 4);
                        printk(KERN_INFO "%s: MII PHY found at address "
                               "%d, status 0x%4.4x advertising %4.4x "
                               "Link %4.4x.\n", dev->name, phy_id,
                               mii_status, rp->mii_if.advertising,
                               mdio_read(dev, phy_id, 5));

                        /* set IFF_RUNNING */
                        if (mii_status & BMSR_LSTATUS)
                                netif_carrier_on(dev);
                        else
                                netif_carrier_off(dev);

                }
        }
        rp->mii_if.phy_id = phy_id;

        return 0;

err_out_unmap:
#ifdef USE_MMIO
        iounmap((void *)ioaddr);
err_out_free_res:
#endif
        pci_release_regions(pdev);
err_out_free_netdev:
        free_netdev(dev);
err_out:
        return rc;
}

static int alloc_ring(struct net_device* dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        void *ring;
        dma_addr_t ring_dma;

        ring = pci_alloc_consistent(rp->pdev,
                                    RX_RING_SIZE * sizeof(struct rx_desc) +
                                    TX_RING_SIZE * sizeof(struct tx_desc),
                                    &ring_dma);
        if (!ring) {
                printk(KERN_ERR "Could not allocate DMA memory.\n");
                return -ENOMEM;
        }
        if (rp->quirks & rqRhineI) {
                rp->tx_bufs = pci_alloc_consistent(rp->pdev,
                                                   PKT_BUF_SZ * TX_RING_SIZE,
                                                   &rp->tx_bufs_dma);
                if (rp->tx_bufs == NULL) {
                        pci_free_consistent(rp->pdev,
                                    RX_RING_SIZE * sizeof(struct rx_desc) +
                                    TX_RING_SIZE * sizeof(struct tx_desc),
                                    ring, ring_dma);
                        return -ENOMEM;
                }
        }

        rp->rx_ring = ring;
        rp->tx_ring = ring + RX_RING_SIZE * sizeof(struct rx_desc);
        rp->rx_ring_dma = ring_dma;
        rp->tx_ring_dma = ring_dma + RX_RING_SIZE * sizeof(struct rx_desc);

        return 0;
}

void free_ring(struct net_device* dev)
{
        struct rhine_private *rp = netdev_priv(dev);

        pci_free_consistent(rp->pdev,
                            RX_RING_SIZE * sizeof(struct rx_desc) +
                            TX_RING_SIZE * sizeof(struct tx_desc),
                            rp->rx_ring, rp->rx_ring_dma);
        rp->tx_ring = NULL;

        if (rp->tx_bufs)
                pci_free_consistent(rp->pdev, PKT_BUF_SZ * TX_RING_SIZE,
                                    rp->tx_bufs, rp->tx_bufs_dma);

        rp->tx_bufs = NULL;

}

static void alloc_rbufs(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        dma_addr_t next;
        int i;

        rp->dirty_rx = rp->cur_rx = 0;

        rp->rx_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);
        rp->rx_head_desc = &rp->rx_ring[0];
        next = rp->rx_ring_dma;

        /* Init the ring entries */
        for (i = 0; i < RX_RING_SIZE; i++) {
                rp->rx_ring[i].rx_status = 0;
                rp->rx_ring[i].desc_length = cpu_to_le32(rp->rx_buf_sz);
                next += sizeof(struct rx_desc);
                rp->rx_ring[i].next_desc = cpu_to_le32(next);
                rp->rx_skbuff[i] = NULL;
        }
        /* Mark the last entry as wrapping the ring. */
        rp->rx_ring[i-1].next_desc = cpu_to_le32(rp->rx_ring_dma);

        /* Fill in the Rx buffers.  Handle allocation failure gracefully. */
        for (i = 0; i < RX_RING_SIZE; i++) {
                struct sk_buff *skb = dev_alloc_skb(rp->rx_buf_sz);
                rp->rx_skbuff[i] = skb;
                if (skb == NULL)
                        break;
                skb->dev = dev;                 /* Mark as being used by this device. */

                rp->rx_skbuff_dma[i] =
                        pci_map_single(rp->pdev, skb->tail, rp->rx_buf_sz,
                                       PCI_DMA_FROMDEVICE);

                rp->rx_ring[i].addr = cpu_to_le32(rp->rx_skbuff_dma[i]);
                rp->rx_ring[i].rx_status = cpu_to_le32(DescOwn);
        }
        rp->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
}

static void free_rbufs(struct net_device* dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        int i;

        /* Free all the skbuffs in the Rx queue. */
        for (i = 0; i < RX_RING_SIZE; i++) {
                rp->rx_ring[i].rx_status = 0;
                rp->rx_ring[i].addr = cpu_to_le32(0xBADF00D0); /* An invalid address. */
                if (rp->rx_skbuff[i]) {
                        pci_unmap_single(rp->pdev,
                                         rp->rx_skbuff_dma[i],
                                         rp->rx_buf_sz, PCI_DMA_FROMDEVICE);
                        dev_kfree_skb(rp->rx_skbuff[i]);
                }
                rp->rx_skbuff[i] = NULL;
        }
}

static void alloc_tbufs(struct net_device* dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        dma_addr_t next;
        int i;

        rp->dirty_tx = rp->cur_tx = 0;
        next = rp->tx_ring_dma;
        for (i = 0; i < TX_RING_SIZE; i++) {
                rp->tx_skbuff[i] = NULL;
                rp->tx_ring[i].tx_status = 0;
                rp->tx_ring[i].desc_length = cpu_to_le32(TXDESC);
                next += sizeof(struct tx_desc);
                rp->tx_ring[i].next_desc = cpu_to_le32(next);
                rp->tx_buf[i] = &rp->tx_bufs[i * PKT_BUF_SZ];
        }
        rp->tx_ring[i-1].next_desc = cpu_to_le32(rp->tx_ring_dma);

}

static void free_tbufs(struct net_device* dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        int i;

        for (i = 0; i < TX_RING_SIZE; i++) {
                rp->tx_ring[i].tx_status = 0;
                rp->tx_ring[i].desc_length = cpu_to_le32(TXDESC);
                rp->tx_ring[i].addr = cpu_to_le32(0xBADF00D0); /* An invalid address. */
                if (rp->tx_skbuff[i]) {
                        if (rp->tx_skbuff_dma[i]) {
                                pci_unmap_single(rp->pdev,
                                                 rp->tx_skbuff_dma[i],
                                                 rp->tx_skbuff[i]->len,
                                                 PCI_DMA_TODEVICE);
                        }
                        dev_kfree_skb(rp->tx_skbuff[i]);
                }
                rp->tx_skbuff[i] = NULL;
                rp->tx_buf[i] = NULL;
        }
}

static void rhine_check_media(struct net_device *dev, unsigned int init_media)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;

        mii_check_media(&rp->mii_if, debug, init_media);

        if (rp->mii_if.full_duplex)
            writeb(readb(ioaddr + ChipCmd1) | Cmd1FDuplex,
                   ioaddr + ChipCmd1);
        else
            writeb(readb(ioaddr + ChipCmd1) & ~Cmd1FDuplex,
                   ioaddr + ChipCmd1);
}

static void init_registers(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;
        int i;

        for (i = 0; i < 6; i++)
                writeb(dev->dev_addr[i], ioaddr + StationAddr + i);

        /* Initialize other registers. */
        writew(0x0006, ioaddr + PCIBusConfig);  /* Tune configuration??? */
        /* Configure initial FIFO thresholds. */
        writeb(0x20, ioaddr + TxConfig);
        rp->tx_thresh = 0x20;
        rp->rx_thresh = 0x60;           /* Written in rhine_set_rx_mode(). */

        writel(rp->rx_ring_dma, ioaddr + RxRingPtr);
        writel(rp->tx_ring_dma, ioaddr + TxRingPtr);

        rhine_set_rx_mode(dev);

        /* Enable interrupts by setting the interrupt mask. */
        writew(IntrRxDone | IntrRxErr | IntrRxEmpty| IntrRxOverflow |
               IntrRxDropped | IntrRxNoBuf | IntrTxAborted |
               IntrTxDone | IntrTxError | IntrTxUnderrun |
               IntrPCIErr | IntrStatsMax | IntrLinkChange,
               ioaddr + IntrEnable);

        writew(CmdStart | CmdTxOn | CmdRxOn | (Cmd1NoTxPoll << 8),
               ioaddr + ChipCmd);
        rhine_check_media(dev, 1);
}

/* Enable MII link status auto-polling (required for IntrLinkChange) */
static void rhine_enable_linkmon(long ioaddr)
{
        writeb(0, ioaddr + MIICmd);
        writeb(MII_BMSR, ioaddr + MIIRegAddr);
        writeb(0x80, ioaddr + MIICmd);

        RHINE_WAIT_FOR((readb(ioaddr + MIIRegAddr) & 0x20));

        writeb(MII_BMSR | 0x40, ioaddr + MIIRegAddr);
}

/* Disable MII link status auto-polling (required for MDIO access) */
static void rhine_disable_linkmon(long ioaddr, u32 quirks)
{
        writeb(0, ioaddr + MIICmd);

        if (quirks & rqRhineI) {
                writeb(0x01, ioaddr + MIIRegAddr);      // MII_BMSR

                /* Can be called from ISR. Evil. */
                mdelay(1);

                /* 0x80 must be set immediately before turning it off */
                writeb(0x80, ioaddr + MIICmd);

                RHINE_WAIT_FOR(readb(ioaddr + MIIRegAddr) & 0x20);

                /* Heh. Now clear 0x80 again. */
                writeb(0, ioaddr + MIICmd);
        }
        else
                RHINE_WAIT_FOR(readb(ioaddr + MIIRegAddr) & 0x80);
}

/* Read and write over the MII Management Data I/O (MDIO) interface. */

static int mdio_read(struct net_device *dev, int phy_id, int regnum)
{
        long ioaddr = dev->base_addr;
        struct rhine_private *rp = netdev_priv(dev);
        int result;

        rhine_disable_linkmon(ioaddr, rp->quirks);

        /* rhine_disable_linkmon already cleared MIICmd */
        writeb(phy_id, ioaddr + MIIPhyAddr);
        writeb(regnum, ioaddr + MIIRegAddr);
        writeb(0x40, ioaddr + MIICmd);          /* Trigger read */
        RHINE_WAIT_FOR(!(readb(ioaddr + MIICmd) & 0x40));
        result = readw(ioaddr + MIIData);

        rhine_enable_linkmon(ioaddr);
        return result;
}

static void mdio_write(struct net_device *dev, int phy_id, int regnum, int value)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;

        rhine_disable_linkmon(ioaddr, rp->quirks);

        /* rhine_disable_linkmon already cleared MIICmd */
        writeb(phy_id, ioaddr + MIIPhyAddr);
        writeb(regnum, ioaddr + MIIRegAddr);
        writew(value, ioaddr + MIIData);
        writeb(0x20, ioaddr + MIICmd);          /* Trigger write */
        RHINE_WAIT_FOR(!(readb(ioaddr + MIICmd) & 0x20));

        rhine_enable_linkmon(ioaddr);
}

static int rhine_open(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;
        int rc;

        rc = request_irq(rp->pdev->irq, &rhine_interrupt, SA_SHIRQ, dev->name,
                        dev);
        if (rc)
                return rc;

        if (debug > 1)
                printk(KERN_DEBUG "%s: rhine_open() irq %d.\n",
                       dev->name, rp->pdev->irq);

        rc = alloc_ring(dev);
        if (rc)
                return rc;
        alloc_rbufs(dev);
        alloc_tbufs(dev);
        rhine_chip_reset(dev);
        init_registers(dev);
        if (debug > 2)
                printk(KERN_DEBUG "%s: Done rhine_open(), status %4.4x "
                       "MII status: %4.4x.\n",
                       dev->name, readw(ioaddr + ChipCmd),
                       mdio_read(dev, rp->mii_if.phy_id, MII_BMSR));

        netif_start_queue(dev);

        return 0;
}

static void rhine_tx_timeout(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;

        printk(KERN_WARNING "%s: Transmit timed out, status %4.4x, PHY status "
               "%4.4x, resetting...\n",
               dev->name, readw(ioaddr + IntrStatus),
               mdio_read(dev, rp->mii_if.phy_id, MII_BMSR));

        /* protect against concurrent rx interrupts */
        disable_irq(rp->pdev->irq);

        spin_lock(&rp->lock);

        /* clear all descriptors */
        free_tbufs(dev);
        free_rbufs(dev);
        alloc_tbufs(dev);
        alloc_rbufs(dev);

        /* Reinitialize the hardware. */
        rhine_chip_reset(dev);
        init_registers(dev);

        spin_unlock(&rp->lock);
        enable_irq(rp->pdev->irq);

        dev->trans_start = jiffies;
        rp->stats.tx_errors++;
        netif_wake_queue(dev);
}

static int rhine_start_tx(struct sk_buff *skb, struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;
        unsigned entry;

        /* Caution: the write order is important here, set the field
           with the "ownership" bits last. */

        /* Calculate the next Tx descriptor entry. */
        entry = rp->cur_tx % TX_RING_SIZE;

        if (skb->len < ETH_ZLEN) {
                skb = skb_padto(skb, ETH_ZLEN);
                if (skb == NULL)
                        return 0;
        }

        rp->tx_skbuff[entry] = skb;

        if ((rp->quirks & rqRhineI) &&
            (((long)skb->data & 3) || skb_shinfo(skb)->nr_frags != 0 || skb->ip_summed == CHECKSUM_HW)) {
                /* Must use alignment buffer. */
                if (skb->len > PKT_BUF_SZ) {
                        /* packet too long, drop it */
                        dev_kfree_skb(skb);
                        rp->tx_skbuff[entry] = NULL;
                        rp->stats.tx_dropped++;
                        return 0;
                }
                skb_copy_and_csum_dev(skb, rp->tx_buf[entry]);
                rp->tx_skbuff_dma[entry] = 0;
                rp->tx_ring[entry].addr = cpu_to_le32(rp->tx_bufs_dma +
                                                      (rp->tx_buf[entry] -
                                                       rp->tx_bufs));
        } else {
                rp->tx_skbuff_dma[entry] =
                        pci_map_single(rp->pdev, skb->data, skb->len,
                                       PCI_DMA_TODEVICE);
                rp->tx_ring[entry].addr = cpu_to_le32(rp->tx_skbuff_dma[entry]);
        }

        rp->tx_ring[entry].desc_length =
                cpu_to_le32(TXDESC | (skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN));

        /* lock eth irq */
        spin_lock_irq(&rp->lock);
        wmb();
        rp->tx_ring[entry].tx_status = cpu_to_le32(DescOwn);
        wmb();

        rp->cur_tx++;

        /* Non-x86 Todo: explicitly flush cache lines here. */

        /* Wake the potentially-idle transmit channel */
        writeb(readb(ioaddr + ChipCmd1) | Cmd1TxDemand,
               ioaddr + ChipCmd1);
        IOSYNC;

        if (rp->cur_tx == rp->dirty_tx + TX_QUEUE_LEN)
                netif_stop_queue(dev);

        dev->trans_start = jiffies;

        spin_unlock_irq(&rp->lock);

        if (debug > 4) {
                printk(KERN_DEBUG "%s: Transmit frame #%d queued in slot %d.\n",
                       dev->name, rp->cur_tx-1, entry);
        }
        return 0;
}

/* The interrupt handler does all of the Rx thread work and cleans up
   after the Tx thread. */
static irqreturn_t rhine_interrupt(int irq, void *dev_instance, struct pt_regs *rgs)
{
        struct net_device *dev = dev_instance;
        long ioaddr;
        u32 intr_status;
        int boguscnt = max_interrupt_work;
        int handled = 0;

        ioaddr = dev->base_addr;

        while ((intr_status = get_intr_status(dev))) {
                handled = 1;

                /* Acknowledge all of the current interrupt sources ASAP. */
                if (intr_status & IntrTxDescRace)
                        writeb(0x08, ioaddr + IntrStatus2);
                writew(intr_status & 0xffff, ioaddr + IntrStatus);
                IOSYNC;

                if (debug > 4)
                        printk(KERN_DEBUG "%s: Interrupt, status %8.8x.\n",
                               dev->name, intr_status);

                if (intr_status & (IntrRxDone | IntrRxErr | IntrRxDropped |
                    IntrRxWakeUp | IntrRxEmpty | IntrRxNoBuf))
                        rhine_rx(dev);

                if (intr_status & (IntrTxErrSummary | IntrTxDone)) {
                        if (intr_status & IntrTxErrSummary) {
                                /* Avoid scavenging before Tx engine turned off */
                                RHINE_WAIT_FOR(!(readb(ioaddr+ChipCmd) & CmdTxOn));
                                if (debug > 2 &&
                                    readb(ioaddr+ChipCmd) & CmdTxOn)
                                        printk(KERN_WARNING "%s: "
                                               "rhine_interrupt() Tx engine"
                                               "still on.\n", dev->name);
                        }
                        rhine_tx(dev);
                }

                /* Abnormal error summary/uncommon events handlers. */
                if (intr_status & (IntrPCIErr | IntrLinkChange |
                                   IntrStatsMax | IntrTxError | IntrTxAborted |
                                   IntrTxUnderrun | IntrTxDescRace))
                        rhine_error(dev, intr_status);

                if (--boguscnt < 0) {
                        printk(KERN_WARNING "%s: Too much work at interrupt, "
                               "status=%#8.8x.\n",
                               dev->name, intr_status);
                        break;
                }
        }

        if (debug > 3)
                printk(KERN_DEBUG "%s: exiting interrupt, status=%8.8x.\n",
                       dev->name, readw(ioaddr + IntrStatus));
        return IRQ_RETVAL(handled);
}

/* This routine is logically part of the interrupt handler, but isolated
   for clarity. */
static void rhine_tx(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        int txstatus = 0, entry = rp->dirty_tx % TX_RING_SIZE;

        spin_lock(&rp->lock);

        /* find and cleanup dirty tx descriptors */
        while (rp->dirty_tx != rp->cur_tx) {
                txstatus = le32_to_cpu(rp->tx_ring[entry].tx_status);
                if (debug > 6)
                        printk(KERN_DEBUG " Tx scavenge %d status %8.8x.\n",
                               entry, txstatus);
                if (txstatus & DescOwn)
                        break;
                if (txstatus & 0x8000) {
                        if (debug > 1)
                                printk(KERN_DEBUG "%s: Transmit error, "
                                       "Tx status %8.8x.\n",
                                       dev->name, txstatus);
                        rp->stats.tx_errors++;
                        if (txstatus & 0x0400) rp->stats.tx_carrier_errors++;
                        if (txstatus & 0x0200) rp->stats.tx_window_errors++;
                        if (txstatus & 0x0100) rp->stats.tx_aborted_errors++;
                        if (txstatus & 0x0080) rp->stats.tx_heartbeat_errors++;
                        if (((rp->quirks & rqRhineI) && txstatus & 0x0002) ||
                            (txstatus & 0x0800) || (txstatus & 0x1000)) {
                                rp->stats.tx_fifo_errors++;
                                rp->tx_ring[entry].tx_status = cpu_to_le32(DescOwn);
                                break; /* Keep the skb - we try again */
                        }
                        /* Transmitter restarted in 'abnormal' handler. */
                } else {
                        if (rp->quirks & rqRhineI)
                                rp->stats.collisions += (txstatus >> 3) & 0x0F;
                        else
                                rp->stats.collisions += txstatus & 0x0F;
                        if (debug > 6)
                                printk(KERN_DEBUG "collisions: %1.1x:%1.1x\n",
                                       (txstatus >> 3) & 0xF,
                                       txstatus & 0xF);
                        rp->stats.tx_bytes += rp->tx_skbuff[entry]->len;
                        rp->stats.tx_packets++;
                }
                /* Free the original skb. */
                if (rp->tx_skbuff_dma[entry]) {
                        pci_unmap_single(rp->pdev,
                                         rp->tx_skbuff_dma[entry],
                                         rp->tx_skbuff[entry]->len,
                                         PCI_DMA_TODEVICE);
                }
                dev_kfree_skb_irq(rp->tx_skbuff[entry]);
                rp->tx_skbuff[entry] = NULL;
                entry = (++rp->dirty_tx) % TX_RING_SIZE;
        }
        if ((rp->cur_tx - rp->dirty_tx) < TX_QUEUE_LEN - 4)
                netif_wake_queue(dev);

        spin_unlock(&rp->lock);
}

/* This routine is logically part of the interrupt handler, but isolated
   for clarity and better register allocation. */
static void rhine_rx(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        int entry = rp->cur_rx % RX_RING_SIZE;
        int boguscnt = rp->dirty_rx + RX_RING_SIZE - rp->cur_rx;

        if (debug > 4) {
                printk(KERN_DEBUG "%s: rhine_rx(), entry %d status %8.8x.\n",
                       dev->name, entry,
                       le32_to_cpu(rp->rx_head_desc->rx_status));
        }

        /* If EOP is set on the next entry, it's a new packet. Send it up. */
        while (!(rp->rx_head_desc->rx_status & cpu_to_le32(DescOwn))) {
                struct rx_desc *desc = rp->rx_head_desc;
                u32 desc_status = le32_to_cpu(desc->rx_status);
                int data_size = desc_status >> 16;

                if (debug > 4)
                        printk(KERN_DEBUG " rhine_rx() status is %8.8x.\n",
                               desc_status);
                if (--boguscnt < 0)
                        break;
                if ((desc_status & (RxWholePkt | RxErr)) != RxWholePkt) {
                        if ((desc_status & RxWholePkt) != RxWholePkt) {
                                printk(KERN_WARNING "%s: Oversized Ethernet "
                                       "frame spanned multiple buffers, entry "
                                       "%#x length %d status %8.8x!\n",
                                       dev->name, entry, data_size,
                                       desc_status);
                                printk(KERN_WARNING "%s: Oversized Ethernet "
                                       "frame %p vs %p.\n", dev->name,
                                       rp->rx_head_desc, &rp->rx_ring[entry]);
                                rp->stats.rx_length_errors++;
                        } else if (desc_status & RxErr) {
                                /* There was a error. */
                                if (debug > 2)
                                        printk(KERN_DEBUG " rhine_rx() Rx "
                                               "error was %8.8x.\n",
                                               desc_status);
                                rp->stats.rx_errors++;
                                if (desc_status & 0x0030) rp->stats.rx_length_errors++;
                                if (desc_status & 0x0048) rp->stats.rx_fifo_errors++;
                                if (desc_status & 0x0004) rp->stats.rx_frame_errors++;
                                if (desc_status & 0x0002) {
                                        /* this can also be updated outside the interrupt handler */
                                        spin_lock(&rp->lock);
                                        rp->stats.rx_crc_errors++;
                                        spin_unlock(&rp->lock);
                                }
                        }
                } else {
                        struct sk_buff *skb;
                        /* Length should omit the CRC */
                        int pkt_len = data_size - 4;

                        /* Check if the packet is long enough to accept without
                           copying to a minimally-sized skbuff. */
                        if (pkt_len < rx_copybreak &&
                                (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
                                skb->dev = dev;
                                skb_reserve(skb, 2);    /* 16 byte align the IP header */
                                pci_dma_sync_single_for_cpu(rp->pdev,
                                                            rp->rx_skbuff_dma[entry],
                                                            rp->rx_buf_sz,
                                                            PCI_DMA_FROMDEVICE);

                                eth_copy_and_sum(skb,
                                                 rp->rx_skbuff[entry]->tail,
                                                 pkt_len, 0);
                                skb_put(skb, pkt_len);
                                pci_dma_sync_single_for_device(rp->pdev,
                                                               rp->rx_skbuff_dma[entry],
                                                               rp->rx_buf_sz,
                                                               PCI_DMA_FROMDEVICE);
                        } else {
                                skb = rp->rx_skbuff[entry];
                                if (skb == NULL) {
                                        printk(KERN_ERR "%s: Inconsistent Rx "
                                               "descriptor chain.\n",
                                               dev->name);
                                        break;
                                }
                                rp->rx_skbuff[entry] = NULL;
                                skb_put(skb, pkt_len);
                                pci_unmap_single(rp->pdev,
                                                 rp->rx_skbuff_dma[entry],
                                                 rp->rx_buf_sz,
                                                 PCI_DMA_FROMDEVICE);
                        }
                        skb->protocol = eth_type_trans(skb, dev);
                        netif_rx(skb);
                        dev->last_rx = jiffies;
                        rp->stats.rx_bytes += pkt_len;
                        rp->stats.rx_packets++;
                }
                entry = (++rp->cur_rx) % RX_RING_SIZE;
                rp->rx_head_desc = &rp->rx_ring[entry];
        }

        /* Refill the Rx ring buffers. */
        for (; rp->cur_rx - rp->dirty_rx > 0; rp->dirty_rx++) {
                struct sk_buff *skb;
                entry = rp->dirty_rx % RX_RING_SIZE;
                if (rp->rx_skbuff[entry] == NULL) {
                        skb = dev_alloc_skb(rp->rx_buf_sz);
                        rp->rx_skbuff[entry] = skb;
                        if (skb == NULL)
                                break;  /* Better luck next round. */
                        skb->dev = dev; /* Mark as being used by this device. */
                        rp->rx_skbuff_dma[entry] =
                                pci_map_single(rp->pdev, skb->tail,
                                               rp->rx_buf_sz,
                                               PCI_DMA_FROMDEVICE);
                        rp->rx_ring[entry].addr = cpu_to_le32(rp->rx_skbuff_dma[entry]);
                }
                rp->rx_ring[entry].rx_status = cpu_to_le32(DescOwn);
        }
}

/*
 * Clears the "tally counters" for CRC errors and missed frames(?).
 * It has been reported that some chips need a write of 0 to clear
 * these, for others the counters are set to 1 when written to and
 * instead cleared when read. So we clear them both ways ...
 */
static inline void clear_tally_counters(const long ioaddr)
{
        writel(0, ioaddr + RxMissed);
        readw(ioaddr + RxCRCErrs);
        readw(ioaddr + RxMissed);
}

static void rhine_restart_tx(struct net_device *dev) {
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;
        int entry = rp->dirty_tx % TX_RING_SIZE;
        u32 intr_status;

        /*
         * If new errors occured, we need to sort them out before doing Tx.
         * In that case the ISR will be back here RSN anyway.
         */
        intr_status = get_intr_status(dev);

        if ((intr_status & IntrTxErrSummary) == 0) {

                /* We know better than the chip where it should continue. */
                writel(rp->tx_ring_dma + entry * sizeof(struct tx_desc),
                       ioaddr + TxRingPtr);

                writeb(readb(ioaddr + ChipCmd) | CmdTxOn,
                       ioaddr + ChipCmd);
                writeb(readb(ioaddr + ChipCmd1) | Cmd1TxDemand,
                       ioaddr + ChipCmd1);
                IOSYNC;
        }
        else {
                /* This should never happen */
                if (debug > 1)
                        printk(KERN_WARNING "%s: rhine_restart_tx() "
                               "Another error occured %8.8x.\n",
                               dev->name, intr_status);
        }

}

static void rhine_error(struct net_device *dev, int intr_status)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;

        spin_lock(&rp->lock);

        if (intr_status & IntrLinkChange)
                rhine_check_media(dev, 0);
        if (intr_status & IntrStatsMax) {
                rp->stats.rx_crc_errors += readw(ioaddr + RxCRCErrs);
                rp->stats.rx_missed_errors += readw(ioaddr + RxMissed);
                clear_tally_counters(ioaddr);
        }
        if (intr_status & IntrTxAborted) {
                if (debug > 1)
                        printk(KERN_INFO "%s: Abort %8.8x, frame dropped.\n",
                               dev->name, intr_status);
        }
        if (intr_status & IntrTxUnderrun) {
                if (rp->tx_thresh < 0xE0)
                        writeb(rp->tx_thresh += 0x20, ioaddr + TxConfig);
                if (debug > 1)
                        printk(KERN_INFO "%s: Transmitter underrun, Tx "
                               "threshold now %2.2x.\n",
                               dev->name, rp->tx_thresh);
        }
        if (intr_status & IntrTxDescRace) {
                if (debug > 2)
                        printk(KERN_INFO "%s: Tx descriptor write-back race.\n",
                               dev->name);
        }
        if ((intr_status & IntrTxError) &&
            (intr_status & (IntrTxAborted |
             IntrTxUnderrun | IntrTxDescRace)) == 0) {
                if (rp->tx_thresh < 0xE0) {
                        writeb(rp->tx_thresh += 0x20, ioaddr + TxConfig);
                }
                if (debug > 1)
                        printk(KERN_INFO "%s: Unspecified error. Tx "
                               "threshold now %2.2x.\n",
                               dev->name, rp->tx_thresh);
        }
        if (intr_status & (IntrTxAborted | IntrTxUnderrun | IntrTxDescRace |
                           IntrTxError))
                rhine_restart_tx(dev);

        if (intr_status & ~(IntrLinkChange | IntrStatsMax | IntrTxUnderrun |
                            IntrTxError | IntrTxAborted | IntrNormalSummary |
                            IntrTxDescRace)) {
                if (debug > 1)
                        printk(KERN_ERR "%s: Something Wicked happened! "
                               "%8.8x.\n", dev->name, intr_status);
        }

        spin_unlock(&rp->lock);
}

static struct net_device_stats *rhine_get_stats(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;
        unsigned long flags;

        spin_lock_irqsave(&rp->lock, flags);
        rp->stats.rx_crc_errors += readw(ioaddr + RxCRCErrs);
        rp->stats.rx_missed_errors += readw(ioaddr + RxMissed);
        clear_tally_counters(ioaddr);
        spin_unlock_irqrestore(&rp->lock, flags);

        return &rp->stats;
}

static void rhine_set_rx_mode(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);
        long ioaddr = dev->base_addr;
        u32 mc_filter[2];       /* Multicast hash filter */
        u8 rx_mode;             /* Note: 0x02=accept runt, 0x01=accept errs */

        if (dev->flags & IFF_PROMISC) {         /* Set promiscuous. */
                /* Unconditionally log net taps. */
                printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n",
                       dev->name);
                rx_mode = 0x1C;
                writel(0xffffffff, ioaddr + MulticastFilter0);
                writel(0xffffffff, ioaddr + MulticastFilter1);
        } else if ((dev->mc_count > multicast_filter_limit)
                   || (dev->flags & IFF_ALLMULTI)) {
                /* Too many to match, or accept all multicasts. */
                writel(0xffffffff, ioaddr + MulticastFilter0);
                writel(0xffffffff, ioaddr + MulticastFilter1);
                rx_mode = 0x0C;
        } else {
                struct dev_mc_list *mclist;
                int i;
                memset(mc_filter, 0, sizeof(mc_filter));
                for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
                     i++, mclist = mclist->next) {
                        int bit_nr = ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;

                        mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
                }
                writel(mc_filter[0], ioaddr + MulticastFilter0);
                writel(mc_filter[1], ioaddr + MulticastFilter1);
                rx_mode = 0x0C;
        }
        writeb(rp->rx_thresh | rx_mode, ioaddr + RxConfig);
}

static void netdev_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
        struct rhine_private *rp = netdev_priv(dev);

        strcpy(info->driver, DRV_NAME);
        strcpy(info->version, DRV_VERSION);
        strcpy(info->bus_info, pci_name(rp->pdev));
}

static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
        struct rhine_private *rp = netdev_priv(dev);
        int rc;

        spin_lock_irq(&rp->lock);
        rc = mii_ethtool_gset(&rp->mii_if, cmd);
        spin_unlock_irq(&rp->lock);

        return rc;
}

static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
        struct rhine_private *rp = netdev_priv(dev);
        int rc;

        spin_lock_irq(&rp->lock);
        rc = mii_ethtool_sset(&rp->mii_if, cmd);
        spin_unlock_irq(&rp->lock);

        return rc;
}

static int netdev_nway_reset(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);

        return mii_nway_restart(&rp->mii_if);
}

static u32 netdev_get_link(struct net_device *dev)
{
        struct rhine_private *rp = netdev_priv(dev);

        return mii_link_ok(&rp->mii_if);
}

static u32 netdev_get_msglevel(struct net_device *dev)
{
        return debug;
}

static void netdev_set_msglevel(struct net_device *dev, u32 value)
{
        debug = value;
}

static void rhine_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
        struct rhine_private *rp = netdev_priv(dev);

        if (!(rp->quirks & rqWOL))
                return;

        spin_lock_irq(&rp->lock);
        wol->supported = WAKE_PHY | WAKE_MAGIC |
                         WAKE_UCAST | WAKE_MCAST | WAKE_BCAST;  /* Untested */
        wol->wolopts = rp->wolopts;
        spin_unlock_irq(&rp->lock);
}

static int rhine_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
        struct rhine_private *rp = netdev_priv(dev);
        u32 support = WAKE_PHY | WAKE_MAGIC |
                      WAKE_UCAST | WAKE_MCAST | WAKE_BCAST;     /* Untested */

        if (!(rp->quirks & rqWOL))
                return -EINVAL;

        if (wol->wolopts & ~support)
                return -EINVAL;

        spin_lock_irq(&rp->lock);
        rp->wolopts = wol->wolopts;
        spin_unlock_irq(&rp->lock);

        return 0;
}

static struct ethtool_ops netdev_ethtool_ops = {
        .get_drvinfo            = netdev_get_drvinfo,
        .get_settings           = netdev_get_settings,
        .set_settings           = netdev_set_settings,
        .nway_reset             = netdev_nway_reset,
        .get_link               = netdev_get_link,
        .get_msglevel           = netdev_get_msglevel,
        .set_msglevel           = netdev_set_msglevel,
        .get_wol                = rhine_get_wol,
        .set_wol                = rhine_set_wol,
        .get_sg                 = ethtool_op_get_sg,
        .get_tx_csum            = ethtool_op_get_tx_csum,
};

static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct rhine_private *rp = netdev_priv(dev);
        int rc;

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

        spin_lock_irq(&rp->lock);
        rc = generic_mii_ioctl(&rp->mii_if, if_mii(rq), cmd, NULL);
        spin_unlock_irq(&rp->lock);

        return rc;
}

static int rhine_close(struct net_device *dev)
{
        long ioaddr = dev->base_addr;
        struct rhine_private *rp = netdev_priv(dev);

        spin_lock_irq(&rp->lock);

        netif_stop_queue(dev);

        if (debug > 1)
                printk(KERN_DEBUG "%s: Shutting down ethercard, "
                       "status was %4.4x.\n",
                       dev->name, readw(ioaddr + ChipCmd));

        /* Switch to loopback mode to avoid hardware races. */
        writeb(rp->tx_thresh | 0x02, ioaddr + TxConfig);

        /* Disable interrupts by clearing the interrupt mask. */
        writew(0x0000, ioaddr + IntrEnable);

        /* Stop the chip's Tx and Rx processes. */
        writew(CmdStop, ioaddr + ChipCmd);

        spin_unlock_irq(&rp->lock);

        free_irq(rp->pdev->irq, dev);
        free_rbufs(dev);
        free_tbufs(dev);
        free_ring(dev);

        return 0;
}


static void __devexit rhine_remove_one(struct pci_dev *pdev)
{
        struct net_device *dev = pci_get_drvdata(pdev);

        unregister_netdev(dev);

        pci_release_regions(pdev);

#ifdef USE_MMIO
        iounmap((char *)(dev->base_addr));
#endif

        free_netdev(dev);
        pci_disable_device(pdev);
        pci_set_drvdata(pdev, NULL);
}

static void rhine_shutdown (struct device *gendev)
{
        struct pci_dev *pdev = to_pci_dev(gendev);
        struct net_device *dev = pci_get_drvdata(pdev);
        struct rhine_private *rp = netdev_priv(dev);

        long ioaddr = dev->base_addr;

        rhine_power_init(dev);

        /* Make sure we use pattern 0, 1 and not 4, 5 */
        if (rp->quirks & rq6patterns)
                writeb(0x04, ioaddr + 0xA7);

        if (rp->wolopts & WAKE_MAGIC)
                writeb(WOLmagic, ioaddr + WOLcrSet);

        if (rp->wolopts & (WAKE_BCAST|WAKE_MCAST))
                writeb(WOLbmcast, ioaddr + WOLcgSet);

        if (rp->wolopts & WAKE_PHY)
                writeb(WOLlnkon | WOLlnkoff, ioaddr + WOLcrSet);

        if (rp->wolopts & WAKE_UCAST)
                writeb(WOLucast, ioaddr + WOLcrSet);

        /* Enable legacy WOL (for old motherboards) */
        writeb(0x01, ioaddr + PwcfgSet);
        writeb(readb(ioaddr + StickyHW) | 0x04, ioaddr + StickyHW);

        /* Hit power state D3 (sleep) */
        writeb(readb(ioaddr + StickyHW) | 0x03, ioaddr + StickyHW);

        /* TODO: Check use of pci_enable_wake() */

}

#ifdef CONFIG_PM
static int rhine_suspend(struct pci_dev *pdev, u32 state)
{
        struct net_device *dev = pci_get_drvdata(pdev);
        struct rhine_private *rp = netdev_priv(dev);
        unsigned long flags;

        if (!netif_running(dev))
                return 0;

        netif_device_detach(dev);
        pci_save_state(pdev, pdev->saved_config_space);

        spin_lock_irqsave(&rp->lock, flags);
        rhine_shutdown(&pdev->dev);
        spin_unlock_irqrestore(&rp->lock, flags);

        return 0;
}

static int rhine_resume(struct pci_dev *pdev)
{
        struct net_device *dev = pci_get_drvdata(pdev);
        struct rhine_private *rp = netdev_priv(dev);
        unsigned long flags;
        int ret;

        if (!netif_running(dev))
                return 0;

        ret = pci_set_power_state(pdev, 0);
        if (debug > 1)
                printk(KERN_INFO "%s: Entering power state D0 %s (%d).\n",
                        dev->name, ret ? "failed" : "succeeded", ret);

        pci_restore_state(pdev, pdev->saved_config_space);

        spin_lock_irqsave(&rp->lock, flags);
#ifdef USE_MMIO
        enable_mmio(rp->pioaddr, rp->quirks);
#endif
        rhine_power_init(dev);
        free_tbufs(dev);
        free_rbufs(dev);
        alloc_tbufs(dev);
        alloc_rbufs(dev);
        init_registers(dev);
        spin_unlock_irqrestore(&rp->lock, flags);

        netif_device_attach(dev);

        return 0;
}
#endif /* CONFIG_PM */

static struct pci_driver rhine_driver = {
        .name           = DRV_NAME,
        .id_table       = rhine_pci_tbl,
        .probe          = rhine_init_one,
        .remove         = __devexit_p(rhine_remove_one),
#ifdef CONFIG_PM
        .suspend        = rhine_suspend,
        .resume         = rhine_resume,
#endif /* CONFIG_PM */
        .driver = {
                .shutdown = rhine_shutdown,
        }
};


static int __init rhine_init(void)
{
/* when a module, this is printed whether or not devices are found in probe */
#ifdef MODULE
        printk(version);
#endif
        return pci_module_init(&rhine_driver);
}


static void __exit rhine_cleanup(void)
{
        pci_unregister_driver(&rhine_driver);
}


module_init(rhine_init);
module_exit(rhine_cleanup);