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/* drivers/net/eepro100.c: An Intel i82557 Ethernet driver for Linux. */

/*

   NOTICE: this version tested with kernels 1.3.72 and later only!

        Written 1996-1998 by Donald Becker.

        This software may be used and distributed according to the terms

        of the GNU Public License, incorporated herein by reference.

        This driver is for the Intel EtherExpress Pro 100B boards.

        It should work with other i82557 and i82558 boards.

        To use a built-in driver, install as drivers/net/eepro100.c.

        To use as a module, use the compile-command at the end of the file.

        The author may be reached as becker@CESDIS.usra.edu, or C/O

        Center of Excellence in Space Data and Information Sciences

           Code 930.5, NASA Goddard Space Flight Center, Greenbelt MD 20771

        For updates see

                http://cesdis.gsfc.nasa.gov/linux/drivers/eepro100.html

        There is also a mailing list based at

                linux-eepro100@cesdis.gsfc.nasa.gov

*/

static const char *version =

"eepro100.c:v1.05 10/16/98 Donald Becker http://cesdis.gsfc.nasa.gov/linux/drivers/eepro100.html\n";

/* A few user-configurable values that apply to all boards.

   First set are undocumented and spelled per Intel recommendations. */

static int congenb = 0;         /* Enable congestion control in the DP83840. */

static int txfifo = 8;          /* Tx FIFO threshold in 4 byte units, 0-15 */

static int rxfifo = 8;          /* Rx FIFO threshold, default 32 bytes. */

/* Tx/Rx DMA burst length, 0-127, 0 == no preemption, tx==128 -> disabled. */

static int txdmacount = 128;

static int rxdmacount = 0;

/* Set the copy breakpoint for the copy-only-tiny-buffer Rx method.

   Lower values use more memory, but are faster. */

static int rx_copybreak = 200;

/* Maximum events (Rx packets, etc.) to handle at each interrupt. */

static int max_interrupt_work = 20;

/* Maximum number of multicast addresses to filter (vs. rx-all-multicast) */

static int multicast_filter_limit = 64;

#include <linux/config.h>

#ifdef MODULE

#ifdef MODVERSIONS

#include <linux/modversions.h>

#endif

#include <linux/module.h>

#else

#define MOD_INC_USE_COUNT

#define MOD_DEC_USE_COUNT

#endif

#include <linux/version.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/timer.h>

#include <linux/errno.h>

#include <linux/ioport.h>

#include <linux/malloc.h>

#include <linux/interrupt.h>

#include <linux/pci.h>

#if LINUX_VERSION_CODE < 0x20155

#include <linux/bios32.h>               /* Ignore the bogus warning in 2.1.100+ */

#endif

#include <asm/bitops.h>

#include <asm/io.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

#include <linux/delay.h>

/* Unused in the 2.0.* version, but retained for documentation. */

#if LINUX_VERSION_CODE > 0x20118  &&  defined(MODULE)

MODULE_AUTHOR("Donald Becker <becker@cesdis.gsfc.nasa.gov>");

MODULE_DESCRIPTION("Intel i82557/i82558 PCI EtherExpressPro driver");

MODULE_PARM(debug, "i");

MODULE_PARM(options, "1-" __MODULE_STRING(8) "i");

MODULE_PARM(full_duplex, "1-" __MODULE_STRING(8) "i");

MODULE_PARM(congenb, "i");

MODULE_PARM(txfifo, "i");

MODULE_PARM(rxfifo, "i");

MODULE_PARM(txdmacount, "i");

MODULE_PARM(rxdmacount, "i");

MODULE_PARM(rx_copybreak, "i");

MODULE_PARM(max_interrupt_work, "i");

MODULE_PARM(multicast_filter_limit, "i");

#endif

#define RUN_AT(x) (jiffies + (x))

#if (LINUX_VERSION_CODE < 0x20123)

#define test_and_set_bit(val, addr) set_bit(val, addr)

#endif

#if LINUX_VERSION_CODE < 0x20159

#define dev_free_skb(skb) dev_kfree_skb(skb, FREE_WRITE);

#else

#define dev_free_skb(skb) dev_kfree_skb(skb);

#endif

/* The total I/O port extent of the board.

   The registers beyond 0x18 only exist on the i82558. */

#define SPEEDO3_TOTAL_SIZE 0x20

int speedo_debug = 0;

/*

                                Theory of Operation

I. Board Compatibility

This device driver is designed for the Intel i82557 "Speedo3" chip, Intel's

single-chip fast Ethernet controller for PCI, as used on the Intel

EtherExpress Pro 100 adapter.

II. Board-specific settings

PCI bus devices are configured by the system at boot time, so no jumpers

need to be set on the board.  The system BIOS should be set to assign the

PCI INTA signal to an otherwise unused system IRQ line.  While it's

possible to share PCI interrupt lines, it negatively impacts performance and

only recent kernels support it.

III. Driver operation

IIIA. General

The Speedo3 is very similar to other Intel network chips, that is to say

"apparently designed on a different planet".  This chips retains the complex

Rx and Tx descriptors and multiple buffers pointers as previous chips, but

also has simplified Tx and Rx buffer modes.  This driver uses the "flexible"

Tx mode, but in a simplified lower-overhead manner: it associates only a

single buffer descriptor with each frame descriptor.

Despite the extra space overhead in each receive skbuff, the driver must use

the simplified Rx buffer mode to assure that only a single data buffer is

associated with each RxFD. The driver implements this by reserving space

for the Rx descriptor at the head of each Rx skbuff.

The Speedo-3 has receive and command unit base addresses that are added to

almost all descriptor pointers.  The driver sets these to zero, so that all

pointer fields are absolute addresses.

The System Control Block (SCB) of some previous Intel chips exists on the

chip in both PCI I/O and memory space.  This driver uses the I/O space

registers, but might switch to memory mapped mode to better support non-x86

processors.

IIIB. Transmit structure

The driver must use the complex Tx command+descriptor mode in order to

have a indirect pointer to the skbuff data section.  Each Tx command block

(TxCB) is associated with two immediately appended Tx Buffer Descriptor

(TxBD).  A fixed ring of these TxCB+TxBD pairs are kept as part of the

speedo_private data structure for each adapter instance.

The newer i82558 explicitly supports this structure, and can read the two

TxBDs in the same PCI burst as the TxCB.

This ring structure is used for all normal transmit packets, but the

transmit packet descriptors aren't long enough for most non-Tx commands such

as CmdConfigure.  This is complicated by the possibility that the chip has

already loaded the link address in the previous descriptor.  So for these

commands we convert the next free descriptor on the ring to a NoOp, and point

that descriptor's link to the complex command.

An additional complexity of these non-transmit commands are that they may be

added asynchronous to the normal transmit queue, so we disable interrupts

whenever the Tx descriptor ring is manipulated.

A notable aspect of these special configure commands is that they do

work with the normal Tx ring entry scavenge method.  The Tx ring scavenge

is done at interrupt time using the 'dirty_tx' index, and checking for the

command-complete bit.  While the setup frames may have the NoOp command on the

Tx ring marked as complete, but not have completed the setup command, this

is not a problem.  The tx_ring entry can be still safely reused, as the

tx_skbuff[] entry is always empty for config_cmd and mc_setup frames.

Commands may have bits set e.g. CmdSuspend in the command word to either

suspend or stop the transmit/command unit.  This driver always flags the last

command with CmdSuspend, erases the CmdSuspend in the previous command, and

then issues a CU_RESUME.

Note: Watch out for the potential race condition here: imagine

        erasing the previous suspend

                the chip processes the previous command

                the chip processes the final command, and suspends

        doing the CU_RESUME

                the chip processes the next-yet-valid post-final-command.

So blindly sending a CU_RESUME is only safe if we do it immediately after

after erasing the previous CmdSuspend, without the possibility of an

intervening delay.  Thus the resume command is always within the

interrupts-disabled region.  This is a timing dependence, but handling this

condition in a timing-independent way would considerably complicate the code.

Note: In previous generation Intel chips, restarting the command unit was a

notoriously slow process.  This is presumably no longer true.

IIIC. Receive structure

Because of the bus-master support on the Speedo3 this driver uses the new

SKBUFF_RX_COPYBREAK scheme, rather than a fixed intermediate receive buffer.

This scheme allocates full-sized skbuffs as receive buffers.  The value

SKBUFF_RX_COPYBREAK is used as the copying breakpoint: it is chosen to

trade-off the memory wasted by passing the full-sized skbuff to the queue

layer for all frames vs. the copying cost of copying a frame to a

correctly-sized skbuff.

For small frames the copying cost is negligible (esp. considering that we

are pre-loading the cache with immediately useful header information), so we

allocate a new, minimally-sized skbuff.  For large frames the copying cost

is non-trivial, and the larger copy might flush the cache of useful data, so

we pass up the skbuff the packet was received into.

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->tbusy flag.  The other thread is the interrupt handler, which is single

threaded by the hardware and other software.

The send packet thread has partial control over the Tx ring and 'dev->tbusy'

flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next

queue slot is empty, it clears the tbusy flag when finished otherwise it sets

the 'sp->tx_full' flag.

The interrupt handler has exclusive control over the Rx ring and records stats

from the Tx ring.  (The Tx-done interrupt can't be selectively turned off, so

we can't avoid the interrupt overhead by having the Tx routine reap the Tx

stats.)  After reaping the stats, it marks the queue entry as empty by setting

the 'base' to zero.      Iff the 'sp->tx_full' flag is set, it clears both the

tx_full and tbusy flags.

IV. Notes

Thanks to Steve Williams of Intel for arranging the non-disclosure agreement

that stated that I could disclose the information.  But I still resent

having to sign an Intel NDA when I'm helping Intel sell their own product!

*/

/* Added by Nino - Begin */

extern int pci20to26_find_class(unsigned int class_code, int index, BYTE *bus, BYTE *dev);

extern int pci20to26_read_config_byte(unsigned int bus, unsigned int dev, int where, u8 *val);

extern int pci20to26_read_config_word(unsigned int bus, unsigned int dev, int where, u16 *val);

extern int pci20to26_read_config_dword(unsigned int bus, unsigned int dev, int where, u32 *val);

extern int pci20to26_write_config_byte(unsigned int bus, unsigned int dev, int where, u8 val);

extern int pci20to26_write_config_word(unsigned int bus, unsigned int dev, int where, u16 val);

extern int pci20to26_write_config_dword(unsigned int bus, unsigned int dev, int where, u32 val);

/* Added by Nino - End */

/* A few values that may be tweaked. */

/* The ring sizes should be a power of two for efficiency. */

#define TX_RING_SIZE    16              /* Effectively 2 entries fewer. */

#define RX_RING_SIZE    16

/* Size of an pre-allocated Rx buffer: <Ethernet MTU> + slack.*/

#define PKT_BUF_SZ              1536

/* Time in jiffies before concluding the transmitter is hung. */

#define TX_TIMEOUT  ((800*HZ)/1000)

/* How to wait for the command unit to accept a command.

   Typically this takes 0 ticks. */

static inline void wait_for_cmd_done(long cmd_ioaddr)

{

        int wait = 100;

        do   ;

        while(inb(cmd_ioaddr) && --wait >= 0);

}

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

/* The rest of these values should never change. */

/* Offsets to the various registers.

   All accesses need not be longword aligned. */

enum speedo_offsets {

        SCBStatus = 0, SCBCmd = 2,      /* Rx/Command Unit command and status. */

        SCBPointer = 4,                         /* General purpose pointer. */

        SCBPort = 8,                            /* Misc. commands and operands.  */

        SCBflash = 12, SCBeeprom = 14, /* EEPROM and flash memory control. */

        SCBCtrlMDI = 16,                        /* MDI interface control. */

        SCBEarlyRx = 20,                        /* Early receive byte count. */

};

/* Commands that can be put in a command list entry. */

enum commands {

        CmdNOp = 0, CmdIASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,

        CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7,

        CmdSuspend = 0x4000,            /* Suspend after completion. */

        CmdIntr = 0x2000,                       /* Interrupt after completion. */

        CmdTxFlex = 0x0008,                     /* Use "Flexible mode" for CmdTx command. */

};

/* The SCB accepts the following controls for the Tx and Rx units: */

#define  CU_START               0x0010

#define  CU_RESUME              0x0020

#define  CU_STATSADDR   0x0040

#define  CU_SHOWSTATS   0x0050  /* Dump statistics counters. */

#define  CU_CMD_BASE    0x0060  /* Base address to add to add CU commands. */

#define  CU_DUMPSTATS   0x0070  /* Dump then reset stats counters. */

#define  RX_START       0x0001

#define  RX_RESUME      0x0002

#define  RX_ABORT       0x0004

#define  RX_ADDR_LOAD   0x0006

#define  RX_RESUMENR    0x0007

#define INT_MASK        0x0100

#define DRVR_INT        0x0200          /* Driver generated interrupt. */

/* The Speedo3 Rx and Tx frame/buffer descriptors. */

struct descriptor_net {                 /* A generic descriptor. */

        s16 status;             /* Offset 0. */

        s16 command;            /* Offset 2. */

        u32 link;                                       /* struct descriptor *  */

        unsigned char params[0];

};

/* The Speedo3 Rx and Tx buffer descriptors. */

struct RxFD {                                   /* Receive frame descriptor. */

        s32 status;

        u32 link;                                       /* struct RxFD * */

        u32 rx_buf_addr;                        /* void * */

        u16 count;

        u16 size;

};

/* Selected elements of the Tx/RxFD.status word. */

enum RxFD_bits {

        RxComplete=0x8000, RxOK=0x2000,

        RxErrCRC=0x0800, RxErrAlign=0x0400, RxErrTooBig=0x0200, RxErrSymbol=0x0010,

        RxEth2Type=0x0020, RxNoMatch=0x0004, RxNoIAMatch=0x0002,

        StatusComplete=0x8000,

};

struct TxFD {                                   /* Transmit frame descriptor set. */

        s32 status;

        u32 link;                                       /* void * */

        u32 tx_desc_addr;                       /* Always points to the tx_buf_addr element. */

        s32 count;                                      /* # of TBD (=1), Tx start thresh., etc. */

        /* This constitutes two "TBD" entries -- we only use one. */

        u32 tx_buf_addr0;                       /* void *, frame to be transmitted.  */

        s32 tx_buf_size0;                       /* Length of Tx frame. */

        u32 tx_buf_addr1;                       /* void *, frame to be transmitted.  */

        s32 tx_buf_size1;                       /* Length of Tx frame. */

};

/* Elements of the dump_statistics block. This block must be lword aligned. */

struct speedo_stats {

        u32 tx_good_frames;

        u32 tx_coll16_errs;

        u32 tx_late_colls;

        u32 tx_underruns;

        u32 tx_lost_carrier;

        u32 tx_deferred;

        u32 tx_one_colls;

        u32 tx_multi_colls;

        u32 tx_total_colls;

        u32 rx_good_frames;

        u32 rx_crc_errs;

        u32 rx_align_errs;

        u32 rx_resource_errs;

        u32 rx_overrun_errs;

        u32 rx_colls_errs;

        u32 rx_runt_errs;

        u32 done_marker;

};

struct speedo_private {

        char devname[8];                        /* Used only for kernel debugging. */

        const char *product_name;

        struct device *next_module;

        struct TxFD     tx_ring[TX_RING_SIZE];  /* Commands (usually CmdTxPacket). */

        /* The saved address of a sent-in-place packet/buffer, for skfree(). */

        struct sk_buff* tx_skbuff[TX_RING_SIZE];

        struct descriptor_net  *last_cmd;       /* Last command sent. */

        /* Rx descriptor ring & addresses of receive-in-place skbuffs. */

        struct RxFD *rx_ringp[RX_RING_SIZE];

        struct sk_buff* rx_skbuff[RX_RING_SIZE];

        struct RxFD *last_rxf;  /* Last command sent. */

        struct enet_statistics stats;

        struct speedo_stats lstats;

        struct timer_list timer;        /* Media selection timer. */

        long last_rx_time;                      /* Last Rx, in jiffies, to handle Rx hang. */

        unsigned int cur_rx, cur_tx;            /* The next free ring entry */

        unsigned int dirty_rx, dirty_tx;        /* The ring entries to be free()ed. */

        int mc_setup_frm_len;                           /* The length of an allocated.. */

        struct descriptor_net *mc_setup_frm;    /* ..multicast setup frame. */

        int mc_setup_busy;                                      /* Avoid double-use of setup frame. */

        int in_interrupt;                                       /* Word-aligned dev->interrupt */

        char rx_mode;                                           /* Current PROMISC/ALLMULTI setting. */

        unsigned int tx_full:1;                         /* The Tx queue is full. */

        unsigned int full_duplex:1;                     /* Full-duplex operation requested. */

        unsigned int default_port:1;            /* Last dev->if_port value. */

        unsigned int rx_bug:1;                          /* Work around receiver hang errata. */

        unsigned int rx_bug10:1;                        /* Receiver might hang at 10mbps. */

        unsigned int rx_bug100:1;                       /* Receiver might hang at 100mbps. */

        unsigned short phy[2];                          /* PHY media interfaces available. */

};

/* The parameters for a CmdConfigure operation.

   There are so many options that it would be difficult to document each bit.

   We mostly use the default or recommended settings. */

const char i82557_config_cmd[22] = {

        22, 0x08, 0, 0,  0, 0x80, 0x32, 0x03,  1, /* 1=Use MII  0=Use AUI */

        0, 0x2E, 0,  0x60, 0,

        0xf2, 0x48,   0, 0x40, 0xf2, 0x80,              /* 0x40=Force full-duplex */

        0x3f, 0x05, };

const char i82558_config_cmd[22] = {

        22, 0x08, 0, 1,  0, 0x80, 0x22, 0x03,  1, /* 1=Use MII  0=Use AUI */

        0, 0x2E, 0,  0x60, 0x08, 0x88,

        0x68, 0, 0x40, 0xf2, 0xBD,              /* 0xBD->0xFD=Force full-duplex */

        0x31, 0x05, };

/* PHY media interface chips. */

static const char *phys[] = {

        "None", "i82553-A/B", "i82553-C", "i82503",

        "DP83840", "80c240", "80c24", "i82555",

        "unknown-8", "unknown-9", "DP83840A", "unknown-11",

        "unknown-12", "unknown-13", "unknown-14", "unknown-15", };

enum phy_chips { NonSuchPhy=0, I82553AB, I82553C, I82503, DP83840, S80C240,

                                         S80C24, I82555, DP83840A=10, };

static const char is_mii[] = { 0, 1, 1, 0, 1, 1, 0, 1 };

static void speedo_found1(struct device *dev, long ioaddr, int irq,

                                                  int card_idx);

static int read_eeprom(long ioaddr, int location, int addr_len);

static int mdio_read(long ioaddr, int phy_id, int location);

static int mdio_write(long ioaddr, int phy_id, int location, int value);

static int speedo_open(struct device *dev);

static void speedo_timer(unsigned long data);

static void speedo_init_rx_ring(struct device *dev);

static int speedo_start_xmit(struct sk_buff *skb, struct device *dev);

static int speedo_rx(struct device *dev);

static void speedo_interrupt(int irq, void *dev_instance, struct pt_regs *regs);

static int speedo_close(struct device *dev);

static struct enet_statistics *speedo_get_stats(struct device *dev);

static int speedo_ioctl(struct device *dev, struct ifreq *rq, int cmd);

static void set_rx_mode(struct device *dev);

/* The parameters that may be passed in... */

/* 'options' is used to pass a transceiver override or full-duplex flag

   e.g. "options=16" for FD, "options=32" for 100mbps-only. */

static int full_duplex[] = {-1, -1, -1, -1, -1, -1, -1, -1};

static int options[] = {-1, -1, -1, -1, -1, -1, -1, -1};

#ifdef MODULE

static int debug = -1;                  /* The debug level */

#endif

#ifdef honor_default_port

/* Optional driver feature to allow forcing the transceiver setting.

   Not recommended. */

static int mii_ctrl[8] = { 0x3300, 0x3100, 0x0000, 0x0100,

                                                   0x2000, 0x2100, 0x0400, 0x3100};

#endif

/* A list of all installed Speedo devices, for removing the driver module. */

static struct device *root_speedo_dev = NULL;

int eepro100_init(struct device *dev)

{

        int cards_found = 0;

        static int pci_index = 0;

        if (! pcibios_present())

                return cards_found;

        for (; pci_index < 8; pci_index++) {

                unsigned char pci_bus, pci_device_fn, pci_latency;

                unsigned short int vendor,device;

                long ioaddr;

                int irq;

                u16 pci_command, new_command;

                if (speedo_debug > 0)

                        printk("Finding Device\n");

                if (pci20to26_find_class (PCI_CLASS_NETWORK_ETHERNET << 8, pci_index,

                                                                &pci_bus, &pci_device_fn)

                        != PCIBIOS_SUCCESSFUL)

                        break;

                pci20to26_read_config_word(pci_bus, pci_device_fn,

                                                                 PCI_VENDOR_ID, &vendor);

                pci20to26_read_config_word(pci_bus, pci_device_fn,

                                                                 PCI_DEVICE_ID, &device);

                if (speedo_debug > 0)

                        printk("Device = %x Vendor = %x\n",(int)device,(int)vendor);

                if (vendor != PCI_VENDOR_ID_INTEL)

                        break;

#if 0 //defined(PCI_SUPPORT_VER2)                       

                {

                        struct pci_dev *pdev = pci_find_slot(pci_bus, pci_device_fn);

                        ioaddr = pdev->base_address[1];         /* Use [0] to mem-map */

                        irq = pdev->irq;

                        printk("Device 1 %d %d\n",ioaddr,irq);

                }

#else

                {

                        u32 pci_ioaddr;

                        u8 pci_irq_line;

                        pci20to26_read_config_byte(pci_bus, pci_device_fn,

                                                                         PCI_INTERRUPT_LINE, &pci_irq_line);

                        /* Note: BASE_ADDRESS_0 is for memory-mapping the registers. */

                        pci20to26_read_config_dword(pci_bus, pci_device_fn,

                                                                          PCI_BASE_ADDRESS_1, &pci_ioaddr);

                        ioaddr = pci_ioaddr;

                        irq = pci_irq_line;

                        printk("Device 2 %d %d\n",ioaddr,irq);

                }

#endif

                /* Remove I/O space marker in bit 0. */

                ioaddr &= ~3;

                if (speedo_debug > 2)

                        printk("Found Intel i82557 PCI Speedo at I/O %#lx, IRQ %d.\n",

                                   ioaddr, irq);

                /* Get and check the bus-master and latency values. */

                pci20to26_read_config_word(pci_bus, pci_device_fn,

                                                                 PCI_COMMAND, &pci_command);

                new_command = pci_command | PCI_COMMAND_MASTER|PCI_COMMAND_IO;

                if (pci_command != new_command) {

                        printk(KERN_INFO "  The PCI BIOS has not enabled this"

                                   " device!  Updating PCI command %4.4x->%4.4x.\n",

                                   pci_command, new_command);

                        pci20to26_write_config_word(pci_bus, pci_device_fn,

                                                                          PCI_COMMAND, new_command);

                }

                pci20to26_read_config_byte(pci_bus, pci_device_fn,

                                                                 PCI_LATENCY_TIMER, &pci_latency);

                if (pci_latency < 32) {

                        printk("  PCI latency timer (CFLT) is unreasonably low at %d."

                                   "  Setting to 32 clocks.\n", pci_latency);

                        pci20to26_write_config_byte(pci_bus, pci_device_fn,

                                                                          PCI_LATENCY_TIMER, 32);

                } else if (speedo_debug > 1)

                        printk("  PCI latency timer (CFLT) is %#x.\n", pci_latency);

                speedo_found1(dev, ioaddr, irq, cards_found);

                dev = NULL;

                cards_found++;

        }

        return cards_found;

}

static void speedo_found1(struct device *dev, long ioaddr, int irq,

                                                  int card_idx)

{

        static int did_version = 0;                     /* Already printed version info. */

        struct speedo_private *sp;

        char *product;

        int i, option;

        u16 eeprom[0x40];

        if (speedo_debug > 0  &&  did_version++ == 0)

                printk(version);

        dev = init_etherdev(dev, sizeof(struct speedo_private));

        if (dev->mem_start > 0)

                option = dev->mem_start;

        else if (card_idx >= 0  &&  options[card_idx] >= 0)

                option = options[card_idx];

        else

                option = 0;

        /* Read the station address EEPROM before doing the reset.

           Perhaps this should even be done before accepting the device,

           then we wouldn't have a device name with which to report the error. */

        {

                u16 sum = 0;

                int j;

                int addr_len = read_eeprom(ioaddr, 0, 6) == 0xffff ? 8 : 6;

                for (j = 0, i = 0; i < 0x40; i++) {

                        u16 value = read_eeprom(ioaddr, i, addr_len);

                        eeprom[i] = value;

                        sum += value;

                        if (i < 3) {

                                dev->dev_addr[j++] = value;

                                dev->dev_addr[j++] = value >> 8;

                        }

                }

                if (sum != 0xBABA)

                        printk(KERN_WARNING "%s: Invalid EEPROM checksum %#4.4x, "

                                   "check settings before activating this device!\n",

                                   dev->name, sum);

                /* Don't  unregister_netdev(dev);  as the EEPro may actually be

                   usable, especially if the MAC address is set later. */

        }

        /* Reset the chip: stop Tx and Rx processes and clear counters.

           This takes less than 10usec and will easily finish before the next

           action. */

        outl(0, ioaddr + SCBPort);

        if (eeprom[3] & 0x0100)

                product = "OEM i82557/i82558 10/100 Ethernet";

        else

                product = "Intel EtherExpress Pro 10/100";

        printk(KERN_INFO "%s: %s at %#3lx, ", dev->name, product, ioaddr);

        for (i = 0; i < 5; i++)

                printk("%2x:", dev->dev_addr[i]);

        printk("%2x, IRQ %d.\n", dev->dev_addr[i], irq);

#ifndef kernel_bloat

        /* OK, this is pure kernel bloat.  I don't like it when other drivers

           waste non-pageable kernel space to emit similar messages, but I need

           them for bug reports. */

        {

                const char *connectors[] = {" RJ45", " BNC", " AUI", " MII"};

                /* The self-test results must be paragraph aligned. */

                s32 str[6], *volatile self_test_results;

                int boguscnt = 16000;   /* Timeout for set-test. */

                if (eeprom[3] & 0x03)

                        printk(KERN_INFO "  Receiver lock-up bug exists -- enabling"

                                   " work-around.\n");

                printk(KERN_INFO "  Board assembly %4.4x%2.2x-%3.3d, Physical"

                           " connectors present:",

                           eeprom[8], eeprom[9]>>8, eeprom[9] & 0xff);

                for (i = 0; i < 4; i++)

                        if (eeprom[5] & (1<<i))

                                printk(connectors[i]);

                printk("\n"KERN_INFO"  Primary interface chip %s PHY #%d.\n",

                           phys[(eeprom[6]>>8)&15], eeprom[6] & 0x1f);

                if (eeprom[7] & 0x0700)

                        printk(KERN_INFO "    Secondary interface chip %s.\n",

                                   phys[(eeprom[7]>>8)&7]);

                if (((eeprom[6]>>8) & 0x3f) == DP83840

                        ||  ((eeprom[6]>>8) & 0x3f) == DP83840A) {

                        int mdi_reg23 = mdio_read(ioaddr, eeprom[6] & 0x1f, 23) | 0x0422;

                        if (congenb)

                          mdi_reg23 |= 0x0100;

                        printk(KERN_INFO"  DP83840 specific setup, setting register 23 to %4.4x.\n",

                                   mdi_reg23);

                        mdio_write(ioaddr, eeprom[6] & 0x1f, 23, mdi_reg23);

                }

                if ((option >= 0) && (option & 0x70)) {

                        printk(KERN_INFO "  Forcing %dMbs %s-duplex operation.\n",

                                   (option & 0x20 ? 100 : 10),

                                   (option & 0x10 ? "full" : "half"));

                        mdio_write(ioaddr, eeprom[6] & 0x1f, 0,

                                           ((option & 0x20) ? 0x2000 : 0) |     /* 100mbps? */

                                           ((option & 0x10) ? 0x0100 : 0)); /* Full duplex? */

                }

                /* Perform a system self-test. */

                self_test_results = (s32*) ((((long) str) + 15) & ~0xf);

                self_test_results[0] = 0;

                self_test_results[1] = -1;

                outl(virt_to_bus(self_test_results) | 1, ioaddr + SCBPort);

                do {

                        udelay(10);

                } while (self_test_results[1] == -1  &&  --boguscnt >= 0);

                if (boguscnt < 0) {             /* Test optimized out. */

                        printk(KERN_ERR "Self test failed, status %8.8x:\n"

                                   KERN_ERR " Failure to initialize the i82557.\n"

                                   KERN_ERR " Verify that the card is a bus-master"

                                   " capable slot.\n",

                                   self_test_results[1]);

                } else

                        printk(KERN_INFO "  General self-test: %s.\n"

                                   KERN_INFO "  Serial sub-system self-test: %s.\n"

                                   KERN_INFO "  Internal registers self-test: %s.\n"

                                   KERN_INFO "  ROM checksum self-test: %s (%#8.8x).\n",

                                   self_test_results[1] & 0x1000 ? "failed" : "passed",

                                   self_test_results[1] & 0x0020 ? "failed" : "passed",

                                   self_test_results[1] & 0x0008 ? "failed" : "passed",

                                   self_test_results[1] & 0x0004 ? "failed" : "passed",

                                   self_test_results[0]);

        }

#endif  /* kernel_bloat */

        outl(0, ioaddr + SCBPort);

        /* We do a request_region() only to register /proc/ioports info. */

        request_region(ioaddr, SPEEDO3_TOTAL_SIZE, "Intel Speedo3 Ethernet");

        dev->base_addr = ioaddr;

        dev->irq = irq;

        if (dev->priv == NULL)

                dev->priv = kmalloc(sizeof(*sp), GFP_KERNEL);

        sp = dev->priv;

        memset(sp, 0, sizeof(*sp));

        sp->next_module = root_speedo_dev;

        root_speedo_dev = dev;

        sp->full_duplex = option >= 0 && (option & 0x10) ? 1 : 0;

        if (card_idx >= 0) {

                if (full_duplex[card_idx] >= 0)

                        sp->full_duplex = full_duplex[card_idx];

        }

        sp->default_port = option >= 0 ? (option & 0x0f) : 0;

        sp->phy[0] = eeprom[6];

        sp->phy[1] = eeprom[7];

        sp->rx_bug = (eeprom[3] & 0x03) == 3 ? 0 : 1;

        if (sp->rx_bug)

                printk(KERN_INFO "  Receiver lock-up workaround activated.\n");

        /* The Speedo-specific entries in the device structure. */

        dev->open = &speedo_open;

        dev->hard_start_xmit = &speedo_start_xmit;

        dev->stop = &speedo_close;

        dev->get_stats = &speedo_get_stats;

        dev->set_multicast_list = &set_rx_mode;

        dev->do_ioctl = &speedo_ioctl;

        return;

}

/* Serial EEPROM section.

   A "bit" grungy, but we work our way through bit-by-bit :->. */

/*  EEPROM_Ctrl bits. */

#define EE_SHIFT_CLK    0x01    /* EEPROM shift clock. */

#define EE_CS                   0x02    /* EEPROM chip select. */

#define EE_DATA_WRITE   0x04    /* EEPROM chip data in. */

#define EE_WRITE_0              0x01

#define EE_WRITE_1              0x05

#define EE_DATA_READ    0x08    /* EEPROM chip data out. */

#define EE_ENB                  (0x4800 | EE_CS)

/* Delay between EEPROM clock transitions.

   This will actually work with no delay on 33Mhz PCI.  */

#define eeprom_delay(nanosec)           udelay(1);

/* The EEPROM commands include the alway-set leading bit. */

#define EE_WRITE_CMD    (5 << addr_len)

#define EE_READ_CMD             (6 << addr_len)

#define EE_ERASE_CMD    (7 << addr_len)

static int read_eeprom(long ioaddr, int location, int addr_len)

{

        unsigned short retval = 0;

        int ee_addr = ioaddr + SCBeeprom;

        int read_cmd = location | EE_READ_CMD;

        int i;

        outw(EE_ENB & ~EE_CS, ee_addr);

        outw(EE_ENB, ee_addr);

        /* Shift the read command bits out. */

        for (i = 12; i >= 0; i--) {

                short dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;

                outw(EE_ENB | dataval, ee_addr);

                eeprom_delay(100);

                outw(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);

                eeprom_delay(150);

        }

        outw(EE_ENB, ee_addr);

        for (i = 15; i >= 0; i--) {

                outw(EE_ENB | EE_SHIFT_CLK, ee_addr);

                eeprom_delay(100);

                retval = (retval << 1) | ((inw(ee_addr) & EE_DATA_READ) ? 1 : 0);

                outw(EE_ENB, ee_addr);

                eeprom_delay(100);

        }

        /* Terminate the EEPROM access. */

        outw(EE_ENB & ~EE_CS, ee_addr);

        return retval;

}

static int mdio_read(long ioaddr, int phy_id, int location)