ni5010.c

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/*  ni5010.c: A network driver for the MiCom-Interlan NI5010 ethercard.
 *
 *  Copyright 1996,1997,2006 Jan-Pascal van Best and Andreas Mohr.
 *
 *  This software may be used and distributed according to the terms
 *  of the GNU General Public License, incorporated herein by reference.
 *
 *  The authors may be reached as:
 *      [email protected]       [email protected]
 *
 *  Sources:
 *      Donald Becker's "skeleton.c"
 *          Crynwr ni5010 packet driver
 *
 *  Changes:
 *      v0.0: First test version
 *      v0.1: First working version
 *      v0.2:
 *      v0.3->v0.90: Now demand setting io and irq when loading as module
 *  970430  v0.91: modified for Linux 2.1.14
 *      v0.92: Implemented Andreas' (better) NI5010 probe
 *  970503  v0.93: Fixed auto-irq failure on warm reboot (JB)
 *  970623  v1.00: First kernel version (AM)
 *  970814  v1.01: Added detection of onboard receive buffer size (AM)
 *  060611  v1.02: slight cleanup: email addresses, driver modernization.
 *  Bugs:
 *      - not SMP-safe (no locking of I/O accesses)
 *      - Note that you have to patch ifconfig for the new /proc/net/dev
 *      format. It gives incorrect stats otherwise.
 *
 *  To do:
 *      Fix all bugs :-)
 *      Move some stuff to chipset_init()
 *      Handle xmt errors other than collisions
 *      Complete merge with Andreas' driver
 *      Implement ring buffers (Is this useful? You can't squeeze
 *          too many packet in a 2k buffer!)
 *      Implement DMA (Again, is this useful? Some docs say DMA is
 *          slower than programmed I/O)
 *
 *  Compile with:
 *      gcc -O2 -fomit-frame-pointer -m486 -D__KERNEL__ \
 *          -DMODULE -c ni5010.c
 *
 *  Insert with e.g.:
 *      insmod ni5010.ko io=0x300 irq=5
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include "ni5010.h"

static const char boardname[] = "NI5010";
static char version[] __initdata =
    "ni5010.c: v1.02 20060611 Jan-Pascal van Best and Andreas Mohr\n";

/* bufsize_rcv == 0 means autoprobing */
static unsigned int bufsize_rcv;

#define JUMPERED_INTERRUPTS /* IRQ line jumpered on board */
#undef JUMPERED_DMA     /* No DMA used */
#undef FULL_IODETECT        /* Only detect in portlist */

#ifndef FULL_IODETECT
/* A zero-terminated list of I/O addresses to be probed. */
static unsigned int ports[] __initdata =
    { 0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0 };
#endif

/* Use 0 for production, 1 for verification, >2 for debug */
#ifndef NI5010_DEBUG
#define NI5010_DEBUG 0
#endif

/* Information that needs to be kept for each board. */
struct ni5010_local {
    int o_pkt_size;
    spinlock_t lock;
};

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

static int  ni5010_probe1(struct net_device *dev, int ioaddr);
static int  ni5010_open(struct net_device *dev);
static int  ni5010_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t ni5010_interrupt(int irq, void *dev_id);
static void ni5010_rx(struct net_device *dev);
static void ni5010_timeout(struct net_device *dev);
static int  ni5010_close(struct net_device *dev);
static void     ni5010_set_multicast_list(struct net_device *dev);
static void reset_receiver(struct net_device *dev);

static int  process_xmt_interrupt(struct net_device *dev);
#define tx_done(dev) 1
static void hardware_send_packet(struct net_device *dev, char *buf, int length, int pad);
static void     chipset_init(struct net_device *dev, int startp);
static void dump_packet(void *buf, int len);
static void     ni5010_show_registers(struct net_device *dev);

static int io;
static int irq;

struct net_device * __init ni5010_probe(int unit)
{
    struct net_device *dev = alloc_etherdev(sizeof(struct ni5010_local));
    int *port;
    int err = 0;

    if (!dev)
        return ERR_PTR(-ENOMEM);

    if (unit >= 0) {
        sprintf(dev->name, "eth%d", unit);
        netdev_boot_setup_check(dev);
        io = dev->base_addr;
        irq = dev->irq;
    }

    PRINTK2((KERN_DEBUG "%s: Entering ni5010_probe\n", dev->name));

    if (io > 0x1ff) {   /* Check a single specified location. */
        err = ni5010_probe1(dev, io);
    } else if (io != 0) {   /* Don't probe at all. */
        err = -ENXIO;
    } else {
#ifdef FULL_IODETECT
        for (io=0x200; io<0x400 && ni5010_probe1(dev, io) ; io+=0x20)
            ;
        if (io == 0x400)
            err = -ENODEV;

#else
        for (port = ports; *port && ni5010_probe1(dev, *port); port++)
            ;
        if (!*port)
            err = -ENODEV;
#endif  /* FULL_IODETECT */
    }
    if (err)
        goto out;
    err = register_netdev(dev);
    if (err)
        goto out1;
    return dev;
out1:
    release_region(dev->base_addr, NI5010_IO_EXTENT);
out:
    free_netdev(dev);
    return ERR_PTR(err);
}

static inline int rd_port(int ioaddr)
{
    inb(IE_RBUF);
    return inb(IE_SAPROM);
}

static void __init trigger_irq(int ioaddr)
{
        outb(0x00, EDLC_RESET); /* Clear EDLC hold RESET state */
        outb(0x00, IE_RESET);   /* Board reset */
        outb(0x00, EDLC_XMASK); /* Disable all Xmt interrupts */
        outb(0x00, EDLC_RMASK); /* Disable all Rcv interrupt */
        outb(0xff, EDLC_XCLR);  /* Clear all pending Xmt interrupts */
        outb(0xff, EDLC_RCLR);  /* Clear all pending Rcv interrupts */
        /*
         * Transmit packet mode: Ignore parity, Power xcvr,
         *  Enable loopback
         */
        outb(XMD_IG_PAR | XMD_T_MODE | XMD_LBC, EDLC_XMODE);
        outb(RMD_BROADCAST, EDLC_RMODE); /* Receive normal&broadcast */
        outb(XM_ALL, EDLC_XMASK);   /* Enable all Xmt interrupts */
        udelay(50);         /* FIXME: Necessary? */
        outb(MM_EN_XMT|MM_MUX, IE_MMODE); /* Start transmission */
}

static const struct net_device_ops ni5010_netdev_ops = {
    .ndo_open       = ni5010_open,
    .ndo_stop       = ni5010_close,
    .ndo_start_xmit     = ni5010_send_packet,
    .ndo_set_rx_mode    = ni5010_set_multicast_list,
    .ndo_tx_timeout     = ni5010_timeout,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_change_mtu     = eth_change_mtu,
};

/*
 *      This is the real probe routine.  Linux has a history of friendly device
 *      probes on the ISA bus.  A good device probes avoids doing writes, and
 *      verifies that the correct device exists and functions.
 */

static int __init ni5010_probe1(struct net_device *dev, int ioaddr)
{
    static unsigned version_printed;
    struct ni5010_local *lp;
    int i;
    unsigned int data = 0;
    int boguscount = 40;
    int err = -ENODEV;

    dev->base_addr = ioaddr;
    dev->irq = irq;

    if (!request_region(ioaddr, NI5010_IO_EXTENT, boardname))
        return -EBUSY;

    /*
     * This is no "official" probe method, I've rather tested which
     * probe works best with my seven NI5010 cards
     * (they have very different serial numbers)
     * Suggestions or failure reports are very, very welcome !
     * But I think it is a relatively good probe method
     * since it doesn't use any "outb"
     * It should be nearly 100% reliable !
     * well-known WARNING: this probe method (like many others)
     * will hang the system if a NE2000 card region is probed !
     *
     *   - Andreas
     */

    PRINTK2((KERN_DEBUG "%s: entering ni5010_probe1(%#3x)\n",
        dev->name, ioaddr));

    if (inb(ioaddr+0) == 0xff)
        goto out;

    while ( (rd_port(ioaddr) & rd_port(ioaddr) & rd_port(ioaddr) &
         rd_port(ioaddr) & rd_port(ioaddr) & rd_port(ioaddr)) != 0xff)
    {
        if (boguscount-- == 0)
            goto out;
    }

    PRINTK2((KERN_DEBUG "%s: I/O #1 passed!\n", dev->name));

    for (i=0; i<32; i++)
        if ( (data = rd_port(ioaddr)) != 0xff) break;
    if (data==0xff)
        goto out;

    PRINTK2((KERN_DEBUG "%s: I/O #2 passed!\n", dev->name));

    if ((data != SA_ADDR0) || (rd_port(ioaddr) != SA_ADDR1) ||
        (rd_port(ioaddr) != SA_ADDR2))
        goto out;

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

    if ( (rd_port(ioaddr) != NI5010_MAGICVAL1) ||
         (rd_port(ioaddr) != NI5010_MAGICVAL2) )
        goto out;

    PRINTK2((KERN_DEBUG "%s: I/O #3 passed!\n", dev->name));

    if (NI5010_DEBUG && version_printed++ == 0)
        printk(KERN_INFO "%s", version);

    printk("NI5010 ethercard probe at 0x%x: ", ioaddr);

    dev->base_addr = ioaddr;

    for (i=0; i<6; i++) {
        outw(i, IE_GP);
        dev->dev_addr[i] = inb(IE_SAPROM);
    }
    printk("%pM ", dev->dev_addr);

    PRINTK2((KERN_DEBUG "%s: I/O #4 passed!\n", dev->name));

#ifdef JUMPERED_INTERRUPTS
    if (dev->irq == 0xff)
        ;
    else if (dev->irq < 2) {
        unsigned long irq_mask;

        PRINTK2((KERN_DEBUG "%s: I/O #5 passed!\n", dev->name));

        irq_mask = probe_irq_on();
        trigger_irq(ioaddr);
        mdelay(20);
        dev->irq = probe_irq_off(irq_mask);

        PRINTK2((KERN_DEBUG "%s: I/O #6 passed!\n", dev->name));

        if (dev->irq == 0) {
            err = -EAGAIN;
            printk(KERN_WARNING "%s: no IRQ found!\n", dev->name);
            goto out;
        }
        PRINTK2((KERN_DEBUG "%s: I/O #7 passed!\n", dev->name));
    } else if (dev->irq == 2) {
        dev->irq = 9;
    }
#endif  /* JUMPERED_INTERRUPTS */
    PRINTK2((KERN_DEBUG "%s: I/O #9 passed!\n", dev->name));

    /* DMA is not supported (yet?), so no use detecting it */
    lp = netdev_priv(dev);

    spin_lock_init(&lp->lock);

    PRINTK2((KERN_DEBUG "%s: I/O #10 passed!\n", dev->name));

/* get the size of the onboard receive buffer
 * higher addresses than bufsize are wrapped into real buffer
 * i.e. data for offs. 0x801 is written to 0x1 with a 2K onboard buffer
 */
    if (!bufsize_rcv) {
            outb(1, IE_MMODE);      /* Put Rcv buffer on system bus */
            outw(0, IE_GP);     /* Point GP at start of packet */
            outb(0, IE_RBUF);   /* set buffer byte 0 to 0 */
            for (i = 1; i < 0xff; i++) {
                    outw(i << 8, IE_GP); /* Point GP at packet size to be tested */
                    outb(i, IE_RBUF);
                    outw(0x0, IE_GP); /* Point GP at start of packet */
                    data = inb(IE_RBUF);
                    if (data == i) break;
            }
        bufsize_rcv = i << 8;
            outw(0, IE_GP);     /* Point GP at start of packet */
            outb(0, IE_RBUF);   /* set buffer byte 0 to 0 again */
    }
        printk("-> bufsize rcv/xmt=%d/%d\n", bufsize_rcv, NI5010_BUFSIZE);

    dev->netdev_ops     = &ni5010_netdev_ops;
    dev->watchdog_timeo = HZ/20;

    dev->flags &= ~IFF_MULTICAST;   /* Multicast doesn't work */

    /* Shut up the ni5010 */
    outb(0, EDLC_RMASK);    /* Mask all receive interrupts */
    outb(0, EDLC_XMASK);    /* Mask all xmit interrupts */
    outb(0xff, EDLC_RCLR);  /* Kill all pending rcv interrupts */
    outb(0xff, EDLC_XCLR);  /* Kill all pending xmt interrupts */

    printk(KERN_INFO "%s: NI5010 found at 0x%x, using IRQ %d", dev->name, ioaddr, dev->irq);
    if (dev->dma)
        printk(" & DMA %d", dev->dma);
    printk(".\n");
    return 0;
out:
    release_region(dev->base_addr, NI5010_IO_EXTENT);
    return err;
}

/*
 * Open/initialize the board.  This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is a non-reboot way to recover if something goes wrong.
 */

static int ni5010_open(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    int i;

    PRINTK2((KERN_DEBUG "%s: entering ni5010_open()\n", dev->name));

    if (request_irq(dev->irq, ni5010_interrupt, 0, boardname, dev)) {
        printk(KERN_WARNING "%s: Cannot get irq %#2x\n", dev->name, dev->irq);
        return -EAGAIN;
    }
    PRINTK3((KERN_DEBUG "%s: passed open() #1\n", dev->name));
        /*
         * Always allocate the DMA channel after the IRQ,
         * and clean up on failure.
         */
#ifdef JUMPERED_DMA
        if (request_dma(dev->dma, cardname)) {
        printk(KERN_WARNING "%s: Cannot get dma %#2x\n", dev->name, dev->dma);
                free_irq(dev->irq, NULL);
                return -EAGAIN;
        }
#endif  /* JUMPERED_DMA */

    PRINTK3((KERN_DEBUG "%s: passed open() #2\n", dev->name));
    /* Reset the hardware here.  Don't forget to set the station address. */

    outb(RS_RESET, EDLC_RESET); /* Hold up EDLC_RESET while configing board */
    outb(0, IE_RESET);      /* Hardware reset of ni5010 board */
    outb(XMD_LBC, EDLC_XMODE);  /* Only loopback xmits */

    PRINTK3((KERN_DEBUG "%s: passed open() #3\n", dev->name));
    /* Set the station address */
    for(i = 0;i < 6; i++) {
        outb(dev->dev_addr[i], EDLC_ADDR + i);
    }

    PRINTK3((KERN_DEBUG "%s: Initialising ni5010\n", dev->name));
    outb(0, EDLC_XMASK);    /* No xmit interrupts for now */
    outb(XMD_IG_PAR | XMD_T_MODE | XMD_LBC, EDLC_XMODE);
                /* Normal packet xmit mode */
    outb(0xff, EDLC_XCLR);  /* Clear all pending xmit interrupts */
    outb(RMD_BROADCAST, EDLC_RMODE);
                /* Receive broadcast and normal packets */
    reset_receiver(dev);    /* Ready ni5010 for receiving packets */

    outb(0, EDLC_RESET);    /* Un-reset the ni5010 */

    netif_start_queue(dev);

    if (NI5010_DEBUG) ni5010_show_registers(dev);

    PRINTK((KERN_DEBUG "%s: open successful\n", dev->name));
        return 0;
}

static void reset_receiver(struct net_device *dev)
{
    int ioaddr = dev->base_addr;

    PRINTK3((KERN_DEBUG "%s: resetting receiver\n", dev->name));
    outw(0, IE_GP);     /* Receive packet at start of buffer */
    outb(0xff, EDLC_RCLR);  /* Clear all pending rcv interrupts */
    outb(0, IE_MMODE);  /* Put EDLC to rcv buffer */
    outb(MM_EN_RCV, IE_MMODE); /* Enable rcv */
    outb(0xff, EDLC_RMASK); /* Enable all rcv interrupts */
}

static void ni5010_timeout(struct net_device *dev)
{
    printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
           tx_done(dev) ? "IRQ conflict" : "network cable problem");
    /* Try to restart the adaptor. */
    /* FIXME: Give it a real kick here */
    chipset_init(dev, 1);
    dev->trans_start = jiffies; /* prevent tx timeout */
    netif_wake_queue(dev);
}

static int ni5010_send_packet(struct sk_buff *skb, struct net_device *dev)
{
    int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;

    PRINTK2((KERN_DEBUG "%s: entering ni5010_send_packet\n", dev->name));

    /*
         * Block sending
     */

    netif_stop_queue(dev);
    hardware_send_packet(dev, (unsigned char *)skb->data, skb->len, length-skb->len);
    dev_kfree_skb (skb);
    return NETDEV_TX_OK;
}

/*
 * The typical workload of the driver:
 * Handle the network interface interrupts.
 */
static irqreturn_t ni5010_interrupt(int irq, void *dev_id)
{
    struct net_device *dev = dev_id;
    struct ni5010_local *lp;
    int ioaddr, status;
    int xmit_was_error = 0;

    PRINTK2((KERN_DEBUG "%s: entering ni5010_interrupt\n", dev->name));

    ioaddr = dev->base_addr;
    lp = netdev_priv(dev);

    spin_lock(&lp->lock);
    status = inb(IE_ISTAT);
    PRINTK3((KERN_DEBUG "%s: IE_ISTAT = %#02x\n", dev->name, status));

        if ((status & IS_R_INT) == 0) ni5010_rx(dev);

        if ((status & IS_X_INT) == 0) {
                xmit_was_error = process_xmt_interrupt(dev);
        }

        if ((status & IS_DMA_INT) == 0) {
                PRINTK((KERN_DEBUG "%s: DMA complete (?)\n", dev->name));
                outb(0, IE_DMA_RST); /* Reset DMA int */
        }

    if (!xmit_was_error)
        reset_receiver(dev);
    spin_unlock(&lp->lock);
    return IRQ_HANDLED;
}


static void dump_packet(void *buf, int len)
{
    int i;

    printk(KERN_DEBUG "Packet length = %#4x\n", len);
    for (i = 0; i < len; i++){
        if (i % 16 == 0) printk(KERN_DEBUG "%#4.4x", i);
        if (i % 2 == 0) printk(" ");
        printk("%2.2x", ((unsigned char *)buf)[i]);
        if (i % 16 == 15) printk("\n");
    }
    printk("\n");
}

/* We have a good packet, get it out of the buffer. */
static void ni5010_rx(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    unsigned char rcv_stat;
    struct sk_buff *skb;
    int i_pkt_size;

    PRINTK2((KERN_DEBUG "%s: entering ni5010_rx()\n", dev->name));

    rcv_stat = inb(EDLC_RSTAT);
    PRINTK3((KERN_DEBUG "%s: EDLC_RSTAT = %#2x\n", dev->name, rcv_stat));

    if ( (rcv_stat & RS_VALID_BITS) != RS_PKT_OK) {
        PRINTK((KERN_INFO "%s: receive error.\n", dev->name));
        dev->stats.rx_errors++;
        if (rcv_stat & RS_RUNT) dev->stats.rx_length_errors++;
        if (rcv_stat & RS_ALIGN) dev->stats.rx_frame_errors++;
        if (rcv_stat & RS_CRC_ERR) dev->stats.rx_crc_errors++;
        if (rcv_stat & RS_OFLW) dev->stats.rx_fifo_errors++;
            outb(0xff, EDLC_RCLR); /* Clear the interrupt */
        return;
    }

        outb(0xff, EDLC_RCLR);  /* Clear the interrupt */

    i_pkt_size = inw(IE_RCNT);
    if (i_pkt_size > ETH_FRAME_LEN || i_pkt_size < 10 ) {
        PRINTK((KERN_DEBUG "%s: Packet size error, packet size = %#4.4x\n",
            dev->name, i_pkt_size));
        dev->stats.rx_errors++;
        dev->stats.rx_length_errors++;
        return;
    }

    /* Malloc up new buffer. */
    skb = netdev_alloc_skb(dev, i_pkt_size + 3);
    if (skb == NULL) {
        printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name);
        dev->stats.rx_dropped++;
        return;
    }

    skb_reserve(skb, 2);

    /* Read packet into buffer */
        outb(MM_MUX, IE_MMODE); /* Rcv buffer to system bus */
    outw(0, IE_GP); /* Seek to beginning of packet */
    insb(IE_RBUF, skb_put(skb, i_pkt_size), i_pkt_size);

    if (NI5010_DEBUG >= 4)
        dump_packet(skb->data, skb->len);

    skb->protocol = eth_type_trans(skb,dev);
    netif_rx(skb);
    dev->stats.rx_packets++;
    dev->stats.rx_bytes += i_pkt_size;

    PRINTK2((KERN_DEBUG "%s: Received packet, size=%#4.4x\n",
        dev->name, i_pkt_size));
}

static int process_xmt_interrupt(struct net_device *dev)
{
    struct ni5010_local *lp = netdev_priv(dev);
    int ioaddr = dev->base_addr;
    int xmit_stat;

    PRINTK2((KERN_DEBUG "%s: entering process_xmt_interrupt\n", dev->name));

    xmit_stat = inb(EDLC_XSTAT);
    PRINTK3((KERN_DEBUG "%s: EDLC_XSTAT = %2.2x\n", dev->name, xmit_stat));

    outb(0, EDLC_XMASK);    /* Disable xmit IRQ's */
    outb(0xff, EDLC_XCLR);  /* Clear all pending xmit IRQ's */

    if (xmit_stat & XS_COLL){
        PRINTK((KERN_DEBUG "%s: collision detected, retransmitting\n",
            dev->name));
        outw(NI5010_BUFSIZE - lp->o_pkt_size, IE_GP);
        /* outb(0, IE_MMODE); */ /* xmt buf on sysbus FIXME: needed ? */
        outb(MM_EN_XMT | MM_MUX, IE_MMODE);
        outb(XM_ALL, EDLC_XMASK); /* Enable xmt IRQ's */
        dev->stats.collisions++;
        return 1;
    }

    /* FIXME: handle other xmt error conditions */

    dev->stats.tx_packets++;
    dev->stats.tx_bytes += lp->o_pkt_size;
    netif_wake_queue(dev);

    PRINTK2((KERN_DEBUG "%s: sent packet, size=%#4.4x\n",
        dev->name, lp->o_pkt_size));

    return 0;
}

/* The inverse routine to ni5010_open(). */
static int ni5010_close(struct net_device *dev)
{
    int ioaddr = dev->base_addr;

    PRINTK2((KERN_DEBUG "%s: entering ni5010_close\n", dev->name));
#ifdef JUMPERED_INTERRUPTS
    free_irq(dev->irq, NULL);
#endif
    /* Put card in held-RESET state */
    outb(0, IE_MMODE);
    outb(RS_RESET, EDLC_RESET);

    netif_stop_queue(dev);

    PRINTK((KERN_DEBUG "%s: %s closed down\n", dev->name, boardname));
    return 0;

}

/* Set or clear the multicast filter for this adaptor.
   num_addrs == -1      Promiscuous mode, receive all packets
   num_addrs == 0       Normal mode, clear multicast list
   num_addrs > 0        Multicast mode, receive normal and MC packets, and do
                        best-effort filtering.
*/
static void ni5010_set_multicast_list(struct net_device *dev)
{
    short ioaddr = dev->base_addr;

    PRINTK2((KERN_DEBUG "%s: entering set_multicast_list\n", dev->name));

    if (dev->flags & IFF_PROMISC || dev->flags & IFF_ALLMULTI ||
        !netdev_mc_empty(dev)) {
        outb(RMD_PROMISC, EDLC_RMODE); /* Enable promiscuous mode */
        PRINTK((KERN_DEBUG "%s: Entering promiscuous mode\n", dev->name));
    } else {
        PRINTK((KERN_DEBUG "%s: Entering broadcast mode\n", dev->name));
        outb(RMD_BROADCAST, EDLC_RMODE);  /* Disable promiscuous mode, use normal mode */
    }
}

static void hardware_send_packet(struct net_device *dev, char *buf, int length, int pad)
{
    struct ni5010_local *lp = netdev_priv(dev);
    int ioaddr = dev->base_addr;
    unsigned long flags;
    unsigned int buf_offs;

    PRINTK2((KERN_DEBUG "%s: entering hardware_send_packet\n", dev->name));

        if (length > ETH_FRAME_LEN) {
                PRINTK((KERN_WARNING "%s: packet too large, not possible\n",
                        dev->name));
                return;
        }

    if (NI5010_DEBUG) ni5010_show_registers(dev);

    if (inb(IE_ISTAT) & IS_EN_XMT) {
        PRINTK((KERN_WARNING "%s: sending packet while already transmitting, not possible\n",
            dev->name));
        return;
    }

    if (NI5010_DEBUG > 3) dump_packet(buf, length);

    buf_offs = NI5010_BUFSIZE - length - pad;

    spin_lock_irqsave(&lp->lock, flags);
    lp->o_pkt_size = length + pad;

    outb(0, EDLC_RMASK);    /* Mask all receive interrupts */
    outb(0, IE_MMODE);  /* Put Xmit buffer on system bus */
    outb(0xff, EDLC_RCLR);  /* Clear out pending rcv interrupts */

    outw(buf_offs, IE_GP); /* Point GP at start of packet */
    outsb(IE_XBUF, buf, length); /* Put data in buffer */
    while(pad--)
        outb(0, IE_XBUF);

    outw(buf_offs, IE_GP); /* Rewrite where packet starts */

    /* should work without that outb() (Crynwr used it) */
    /*outb(MM_MUX, IE_MMODE);*/ /* Xmt buffer to EDLC bus */
    outb(MM_EN_XMT | MM_MUX, IE_MMODE); /* Begin transmission */
    outb(XM_ALL, EDLC_XMASK); /* Cause interrupt after completion or fail */

    spin_unlock_irqrestore(&lp->lock, flags);

    netif_wake_queue(dev);

    if (NI5010_DEBUG) ni5010_show_registers(dev);
}

static void chipset_init(struct net_device *dev, int startp)
{
    /* FIXME: Move some stuff here */
    PRINTK3((KERN_DEBUG "%s: doing NOTHING in chipset_init\n", dev->name));
}

static void ni5010_show_registers(struct net_device *dev)
{
    int ioaddr = dev->base_addr;

    PRINTK3((KERN_DEBUG "%s: XSTAT %#2.2x\n", dev->name, inb(EDLC_XSTAT)));
    PRINTK3((KERN_DEBUG "%s: XMASK %#2.2x\n", dev->name, inb(EDLC_XMASK)));
    PRINTK3((KERN_DEBUG "%s: RSTAT %#2.2x\n", dev->name, inb(EDLC_RSTAT)));
    PRINTK3((KERN_DEBUG "%s: RMASK %#2.2x\n", dev->name, inb(EDLC_RMASK)));
    PRINTK3((KERN_DEBUG "%s: RMODE %#2.2x\n", dev->name, inb(EDLC_RMODE)));
    PRINTK3((KERN_DEBUG "%s: XMODE %#2.2x\n", dev->name, inb(EDLC_XMODE)));
    PRINTK3((KERN_DEBUG "%s: ISTAT %#2.2x\n", dev->name, inb(IE_ISTAT)));
}

#ifdef MODULE
static struct net_device *dev_ni5010;

module_param(io, int, 0);
module_param(irq, int, 0);
MODULE_PARM_DESC(io, "ni5010 I/O base address");
MODULE_PARM_DESC(irq, "ni5010 IRQ number");

static int __init ni5010_init_module(void)
{
    PRINTK2((KERN_DEBUG "%s: entering init_module\n", boardname));
    /*
    if(io <= 0 || irq == 0){
        printk(KERN_WARNING "%s: Autoprobing not allowed for modules.\n", boardname);
        printk(KERN_WARNING "%s: Set symbols 'io' and 'irq'\n", boardname);
        return -EINVAL;
    }
    */
    if (io <= 0){
        printk(KERN_WARNING "%s: Autoprobing for modules is hazardous, trying anyway..\n", boardname);
    }

    PRINTK2((KERN_DEBUG "%s: init_module irq=%#2x, io=%#3x\n", boardname, irq, io));
    dev_ni5010 = ni5010_probe(-1);
    if (IS_ERR(dev_ni5010))
        return PTR_ERR(dev_ni5010);
        return 0;
}

static void __exit ni5010_cleanup_module(void)
{
    PRINTK2((KERN_DEBUG "%s: entering cleanup_module\n", boardname));
    unregister_netdev(dev_ni5010);
    release_region(dev_ni5010->base_addr, NI5010_IO_EXTENT);
    free_netdev(dev_ni5010);
}
module_init(ni5010_init_module);
module_exit(ni5010_cleanup_module);
#endif /* MODULE */
MODULE_LICENSE("GPL");