linux/drivers/net/ni5010.c

/*	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:
 *		janpascal@vanbest.org		andi@lisas.de
 *
 *	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/slab.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 */
}

/*
 *      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);
	memset(dev->priv, 0, sizeof(struct ni5010_local));

	dev->open		= ni5010_open;
	dev->stop		= ni5010_close;
	dev->hard_start_xmit	= ni5010_send_packet;
	dev->set_multicast_list = ni5010_set_multicast_list;
	dev->tx_timeout		= ni5010_timeout;
	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;
	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->trans_start = jiffies;
	dev_kfree_skb (skb);
	return 0;
}

/*
 * 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");

	return;
}

/* 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 = dev_alloc_skb(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 || dev->mc_list) {
		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");

/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c ni5010.c"
 *  version-control: t
 *  kept-new-versions: 5
 *  tab-width: 4
 * End:
 */