/* 82596.c: A generic 82596 ethernet driver for linux. */
/*
   Based on Apricot.c
   Written 1994 by Mark Evans.
   This driver is for the Apricot 82596 bus-master interface

   Modularised 12/94 Mark Evans


   Modified to support the 82596 ethernet chips on 680x0 VME boards.
   by Richard Hirst <richard@sleepie.demon.co.uk>
   Renamed to be 82596.c

   980825:  Changed to receive directly in to sk_buffs which are
   allocated at open() time.  Eliminates copy on incoming frames
   (small ones are still copied).  Shared data now held in a
   non-cached page, so we can run on 68060 in copyback mode.

   TBD:
   * look at deferring rx frames rather than discarding (as per tulip)
   * handle tx ring full as per tulip
   * performace test to tune rx_copybreak

   Most of my modifications relate to the braindead big-endian
   implementation by Intel.  When the i596 is operating in
   'big-endian' mode, it thinks a 32 bit value of 0x12345678
   should be stored as 0x56781234.  This is a real pain, when
   you have linked lists which are shared by the 680x0 and the
   i596.

   Driver skeleton
   Written 1993 by Donald Becker.
   Copyright 1993 United States Government as represented by the Director,
   National Security Agency. This software may only be used and distributed
   according to the terms of the GNU Public License as modified by SRC,
   incorporated herein by reference.

   The author may be reached as becker@super.org or
   C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715

 */

static const char *version = "82596.c:v1.0 15/07/98\n";

#include <linux/config.h>
#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/malloc.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>

#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/pgtable.h>

#if defined(CONFIG_MVME16x_NET) || defined(CONFIG_MVME16x_NET_MODULE)
#define ENABLE_MVME16x_NET
#endif
#if defined(CONFIG_BVME6000_NET) || defined(CONFIG_BVME6000_NET_MODULE)
#define ENABLE_BVME6000_NET
#endif
#if defined(CONFIG_APRICOT) || defined(CONFIG_APRICOT_MODULE)
#define ENABLE_APRICOT
#endif

#ifdef ENABLE_MVME16x_NET
#include <asm/mvme16xhw.h>
#endif
#ifdef ENABLE_BVME6000_NET
#include <asm/bvme6000hw.h>
#endif

/*
 * Define various macros for Channel Attention, word swapping etc., dependent
 * on architecture.  MVME and BVME are 680x0 based, otherwise it is Intel.
 */

#ifdef __mc68000__
#define WSWAPrfd(x)  ((struct i596_rfd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPrbd(x)  ((struct i596_rbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPiscp(x) ((struct i596_iscp *)(((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPscb(x)  ((struct i596_scb *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPcmd(x)  ((struct i596_cmd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPtbd(x)  ((struct i596_tbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPchar(x) ((char *)            (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define ISCP_BUSY	0x00010000
#define MACH_IS_APRICOT	0
#else
#define WSWAPrfd(x)	x
#define WSWAPrbd(x)	((struct i596_rbd *)(x))
#define WSWAPiscp(x)	((struct i596_iscp *)(x))
#define WSWAPscb(x)	((struct i596_scb *)(x))
#define WSWAPcmd(x)	x
#define WSWAPtbd(x)	x
#define WSWAPchar(x)	((char *)(x))
#define ISCP_BUSY	0x0001
#define MACH_IS_APRICOT	1
#endif

/*
 * The MPU_PORT command allows direct access to the 82596. With PORT access
 * the following commands are available (p5-18). The 32-bit port command
 * must be word-swapped with the most significant word written first.
 * This only applies to VME boards.
 */
#define PORT_RESET		0x00	/* reset 82596 */
#define PORT_SELFTEST		0x01	/* selftest */
#define PORT_ALTSCP		0x02	/* alternate SCB address */
#define PORT_ALTDUMP		0x03	/* Alternate DUMP address */

#define I82596_DEBUG 1

#ifdef I82596_DEBUG
int i596_debug = I82596_DEBUG;
#else
int i596_debug = 1;
#endif

/* Copy frames shorter than rx_copybreak, otherwise pass on up in
 * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
 */
static int rx_copybreak = 100;

#define PKT_BUF_SZ	1536
#define MAX_MC_CNT	64

#define I596_TOTAL_SIZE 17

#define I596_NULL -1

#define CMD_EOL		0x8000	/* The last command of the list, stop. */
#define CMD_SUSP	0x4000	/* Suspend after doing cmd. */
#define CMD_INTR	0x2000	/* Interrupt after doing cmd. */

#define CMD_FLEX	0x0008	/* Enable flexible memory model */

enum commands {
	CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
	CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
};

#define STAT_C		0x8000	/* Set to 0 after execution */
#define STAT_B		0x4000	/* Command being executed */
#define STAT_OK		0x2000	/* Command executed ok */
#define STAT_A		0x1000	/* Command aborted */

#define	 CUC_START	0x0100
#define	 CUC_RESUME	0x0200
#define	 CUC_SUSPEND    0x0300
#define	 CUC_ABORT	0x0400
#define	 RX_START	0x0010
#define	 RX_RESUME	0x0020
#define	 RX_SUSPEND	0x0030
#define	 RX_ABORT	0x0040

#define	 TX_TIMEOUT	5

struct i596_reg {
	unsigned short porthi;
	unsigned short portlo;
	unsigned long ca;
};

struct i596_cmd {
	unsigned short status;
	unsigned short command;
	struct i596_cmd *next;
};

#define EOF		0x8000
#define SIZE_MASK	0x3fff

struct i596_tbd {
	unsigned short size;
	unsigned short pad;
	struct i596_tbd *next;
	char *data;
};

struct tx_cmd {
	struct i596_cmd cmd;
	struct i596_tbd *tbd;
	unsigned short size;
	unsigned short pad;
	struct sk_buff *skb;	/* So we can free it after tx */
};

struct i596_rfd {
	unsigned short stat;
	unsigned short cmd;
	struct i596_rfd *next;
	struct i596_rbd *rbd;
	unsigned short count;
	unsigned short size;
};

struct i596_rbd {
    unsigned short count;
    unsigned short zero1;
    struct i596_rbd *next;
    char *data;
    unsigned short size;
    unsigned short zero2;
    struct sk_buff *skb;
};

#define TX_RING_SIZE 16
#define RX_RING_SIZE 16

struct i596_scb {
	unsigned short status;
	unsigned short command;
	struct i596_cmd *cmd;
	struct i596_rfd *rfd;
	unsigned long crc_err;
	unsigned long align_err;
	unsigned long resource_err;
	unsigned long over_err;
	unsigned long rcvdt_err;
	unsigned long short_err;
	unsigned short t_on;
	unsigned short t_off;
};

struct i596_iscp {
	unsigned long stat;
	struct i596_scb *scb;
};

struct i596_scp {
	unsigned long sysbus;
	unsigned long pad;
	struct i596_iscp *iscp;
};

struct i596_private {
	volatile struct i596_scp scp;
	volatile struct i596_iscp iscp;
	volatile struct i596_scb scb;
	struct i596_cmd set_add;
	char eth_addr[8];
	struct i596_cmd set_conf;
	char i596_config[16];
	struct i596_cmd tdr;
	struct i596_cmd mc_cmd;		/* Keep these three together!!! */
	short mc_cnt;			/* Keep these three together!!! */
	char mc_addrs[MAX_MC_CNT*6];	/* Keep these three together!!! */
	unsigned long stat;
	int last_restart __attribute__((aligned(4)));
	struct i596_rfd *rx_tail;
	struct i596_cmd *cmd_tail;
	struct i596_cmd *cmd_head;
	int cmd_backlog;
	unsigned long last_cmd;
	struct net_device_stats stats;
	struct i596_rfd rfds[RX_RING_SIZE];
	struct i596_rbd rbds[RX_RING_SIZE];
	struct tx_cmd tx_cmds[TX_RING_SIZE];
	struct i596_tbd tbds[TX_RING_SIZE];
	int next_tx_cmd;
	spinlock_t lock;
};

char init_setup[] =
{
	0x8E,			/* length, prefetch on */
	0xC8,			/* fifo to 8, monitor off */
#ifdef CONFIG_VME
	0xc0,			/* don't save bad frames */
#else
	0x80,			/* don't save bad frames */
#endif
	0x2E,			/* No source address insertion, 8 byte preamble */
	0x00,			/* priority and backoff defaults */
	0x60,			/* interframe spacing */
	0x00,			/* slot time LSB */
	0xf2,			/* slot time and retries */
	0x00,			/* promiscuous mode */
	0x00,			/* collision detect */
	0x40,			/* minimum frame length */
	0xff,
	0x00,
	0x7f /*  *multi IA */ };

static int i596_open(struct net_device *dev);
static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
static void i596_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static int i596_close(struct net_device *dev);
static struct net_device_stats *i596_get_stats(struct net_device *dev);
static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
static void i596_tx_timeout (struct net_device *dev);
static void print_eth(char *);
static void set_multicast_list(struct net_device *dev);

static int rx_ring_size = RX_RING_SIZE;
static int ticks_limit = 25;
static int max_cmd_backlog = 16;


static inline void CA(struct net_device *dev)
{
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		((struct i596_reg *) dev->base_addr)->ca = 1;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile u32 i = *(volatile u32 *) (dev->base_addr);
	}
#endif
#ifdef ENABLE_APRICOT
	if (MACH_IS_APRICOT) {
		outw(0, (short) (dev->base_addr) + 4);
	}
#endif
}


static inline void MPU_PORT(struct net_device *dev, int c, volatile void *x)
{
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		struct i596_reg *p = (struct i596_reg *) (dev->base_addr);
		p->porthi = ((c) | (u32) (x)) & 0xffff;
		p->portlo = ((c) | (u32) (x)) >> 16;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		u32 v = (u32) (c) | (u32) (x);
		v = ((u32) (v) << 16) | ((u32) (v) >> 16);
		*(volatile u32 *) dev->base_addr = v;
		udelay(1);
		*(volatile u32 *) dev->base_addr = v;
	}
#endif
}


#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
static void i596_error(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = dev_id;
	struct i596_cmd *cmd;

	struct i596_private *lp = (struct i596_private *) dev->priv;
	printk("i596_error: lp = 0x%08x\n", (u32) lp);
	printk("scp at %08x, .sysbus = %08x, .iscp = %08x\n",
	       (u32) & lp->scp, (u32) lp->scp.sysbus, (u32) lp->scp.iscp);
	printk("iscp at %08x, .stat = %08x, .scb = %08x\n",
	       (u32) & lp->iscp, (u32) lp->iscp.stat, (u32) lp->iscp.scb);
	printk("scb at %08x, .status = %04x, .command = %04x\n",
	       (u32) & lp->scb, lp->scb.status, lp->scb.command);
	printk("   .cmd = %08x, .rfd = %08x\n", (u32) lp->scb.cmd,
	       (u32) lp->scb.rfd);
	cmd = WSWAPcmd(lp->scb.cmd);
	while (cmd && (u32) cmd < 0x1000000) {
		printk("cmd at %08x, .status = %04x, .command = %04x, .next = %08x\n",
		  (u32) cmd, cmd->status, cmd->command, (u32) cmd->next);
		cmd = WSWAPcmd(cmd->next);
	}
	while (1);
}
#endif

static inline void init_rx_bufs(struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *)dev->priv;
	int i;
	struct i596_rfd *rfd;
	struct i596_rbd *rbd;

	if (i596_debug > 1)
		printk ("%s: init_rx_bufs %d.\n", dev->name, rx_ring_size);

	/* First build the Receive Buffer Descriptor List */

	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
		struct sk_buff *skb = dev_alloc_skb(PKT_BUF_SZ);

		if (skb == NULL)
			panic("82596: alloc_skb() failed");
		skb->dev = dev;
		rbd->next = WSWAPrbd(rbd+1);
		rbd->skb = skb;
		rbd->data = WSWAPchar(skb->tail);
		rbd->size = PKT_BUF_SZ;
#ifdef __mc68000__
		cache_clear(virt_to_phys(skb->tail), PKT_BUF_SZ);
#endif
	}
	lp->rbds[rx_ring_size-1].next = WSWAPrbd(lp->rbds);

	/* Now build the Receive Frame Descriptor List */

	for (i = 0, rfd = lp->rfds; i < rx_ring_size; i++, rfd++) {
		rfd->rbd = (struct i596_rbd *)I596_NULL;
		rfd->next = WSWAPrfd(rfd+1);
		rfd->cmd = CMD_FLEX;
	}
	lp->scb.rfd = WSWAPrfd(lp->rfds);
	lp->rfds[0].rbd = WSWAPrbd(lp->rbds);
	rfd = lp->rfds + rx_ring_size - 1;
	lp->rx_tail = rfd;
	rfd->next = WSWAPrfd(lp->rfds);
	rfd->cmd = CMD_EOL|CMD_FLEX;
}

static inline void remove_rx_bufs(struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *)dev->priv;
	struct i596_rbd *rbd;
	int i;

	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
		if (rbd->skb == NULL)
			break;
		dev_kfree_skb(rbd->skb);
	}
}

static inline void init_i596_mem(struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *) dev->priv;
#if !defined(ENABLE_MVME16x_NET) && !defined(ENABLE_BVME6000_NET)
	short ioaddr = dev->base_addr;
#endif
	int boguscnt = 100000;
	unsigned long flags;
	int i;

#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		/* Disable all ints for now */
		pcc2[0x28] = 1;
		pcc2[0x2a] = 0x40;
		/* Following disables snooping.  Snooping is not required
		 * as we make appropriate use of non-cached pages for
		 * shared data, and cache_push/cache_clear.
		 */
		pcc2[0x2b] = 0x00;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 1;
	}
#endif

	MPU_PORT(dev, PORT_RESET, 0);

	udelay(100);		/* Wait 100us - seems to help */

	/* change the scp address */

	MPU_PORT(dev, PORT_ALTSCP, &lp->scp);

#elif defined(ENABLE_APRICOT)

	/* change the scp address */
	outw(0, ioaddr);
	outw(0, ioaddr);
	outb(4, ioaddr + 0xf);
	outw(((((int) &lp->scp) & 0xffff) | 2), ioaddr);
	outw((((int) &lp->scp) >> 16) & 0xffff, ioaddr);
#endif

	lp->last_cmd = jiffies;

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x)
		lp->scp.sysbus = 0x00000054;
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000)
		lp->scp.sysbus = 0x0000004c;
#endif
#ifdef ENABLE_APRICOT
	if (MACH_IS_APRICOT)
		lp->scp.sysbus = 0x00440000;
#endif

	lp->scp.iscp = WSWAPiscp(&(lp->iscp));
	lp->iscp.scb = WSWAPscb(&(lp->scb));
	lp->iscp.stat = ISCP_BUSY;
	lp->cmd_backlog = 0;

	lp->cmd_head = lp->scb.cmd = (struct i596_cmd *) I596_NULL;

	if (i596_debug > 1)
		printk("%s: starting i82596.\n", dev->name);

#if defined(ENABLE_APRICOT)
	(void) inb(ioaddr + 0x10);
	outb(4, ioaddr + 0xf);
#endif
	CA(dev);

	while (lp->iscp.stat)
		if (--boguscnt == 0) {
			printk("%s: i82596 initialization timed out with status %4.4x, cmd %4.4x.\n",
			     dev->name, lp->scb.status, lp->scb.command);
			break;
		}

	/* Ensure rx frame/buffer descriptors are tidy */
	/* Bit naff doing this here as well as in init_rx_bufs() */

	for (i = 0; i < rx_ring_size; i++) {
		lp->rfds[i].rbd = (struct i596_rbd *)I596_NULL;
		lp->rfds[i].cmd = CMD_FLEX;
	}
	lp->rfds[rx_ring_size-1].cmd = CMD_EOL|CMD_FLEX;
	lp->scb.rfd = WSWAPrfd(lp->rfds);
	lp->rfds[0].rbd = WSWAPrbd(lp->rbds);
	lp->rx_tail = lp->rfds + rx_ring_size - 1;

	lp->scb.command = 0;

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		/* Enable ints, etc. now */
		pcc2[0x2a] = 0x08;
		pcc2[0x2a] = 0x55;	/* Edge sensitive */
		pcc2[0x2b] = 0x55;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 3;
	}
#endif

	memcpy(lp->i596_config, init_setup, 14);
	lp->set_conf.command = CmdConfigure;
	i596_add_cmd(dev, &lp->set_conf);

	memcpy(lp->eth_addr, dev->dev_addr, 6);
	lp->set_add.command = CmdSASetup;
	i596_add_cmd(dev, &lp->set_add);

	lp->tdr.command = CmdTDR;
	i596_add_cmd(dev, &lp->tdr);

	boguscnt = 200000;

	spin_lock_irqsave (&lp->lock, flags);

	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("%s: receive unit start timed out with status %4.4x, cmd %4.4x.\n",
			     dev->name, lp->scb.status, lp->scb.command);
			break;
		}
	lp->scb.command = RX_START;
	CA(dev);

	spin_unlock_irqrestore (&lp->lock, flags);

	boguscnt = 2000;
	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("i82596 init timed out with status %4.4x, cmd %4.4x.\n",
			       lp->scb.status, lp->scb.command);
			break;
		}
	return;
}

static inline int i596_rx(struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *)dev->priv;
	struct i596_rfd *rfd;
	struct i596_rbd *rbd;
	int frames = 0;

	if (i596_debug > 3)
		printk ("i596_rx()\n");

	rfd = WSWAPrfd(lp->scb.rfd);		/* Ref next frame to check */

	while ((rfd->stat) & STAT_C) {		/* Loop while complete frames */
		rbd = WSWAPrbd(rfd->rbd);       /* Ref associated buffer desc */

		if (i596_debug >2)
			print_eth(WSWAPchar(rbd->data));

		if ((rfd->stat) & STAT_OK) {
			/* a good frame */
			int pkt_len = rbd->count & 0x3fff;
			struct sk_buff *skb = rbd->skb;
			int rx_in_place = 0;

			frames++;

			/* Check if the packet is long enough to just accept
			 * without copying to a properly sized skbuff.
			 */

			if (pkt_len > rx_copybreak) {
				struct sk_buff *newskb;
				char *temp;

				/* Get fresh skbuff to replace filled one. */
				newskb = dev_alloc_skb(PKT_BUF_SZ);
				if (newskb == NULL) {
					skb = NULL;	/* drop pkt */
					goto memory_squeeze;
				}
				/* Pass up the skb already on the Rx ring. */
				temp = skb_put(skb, pkt_len);
				if (WSWAPchar(rbd->data) != temp)
					printk(KERN_ERR "%s: Internal consistency error "
						"-- the skbuff addresses do not match"
						" in i596_rx: %p vs. %p / %p.\n", dev->name,
						WSWAPchar(rbd->data),
						skb->head, temp);
				rx_in_place = 1;
				rbd->skb = newskb;
				newskb->dev = dev;
				rbd->data = WSWAPchar(newskb->tail);
#ifdef __mc68000__
				cache_clear(virt_to_phys(newskb->tail), PKT_BUF_SZ);
#endif
			}
			else
				skb = dev_alloc_skb(pkt_len + 2);
memory_squeeze:
			if (skb == NULL) {
				/* XXX tulip.c can defer packets here!! */
				printk ("%s: i596_rx Memory squeeze, dropping packet.\n", dev->name);
				lp->stats.rx_dropped++;
			}
			else {
				skb->dev = dev;
				if (!rx_in_place) {
					/* 16 byte align the data fields */
					skb_reserve(skb, 2);
					memcpy(skb_put(skb,pkt_len),
						WSWAPchar(rbd->data), pkt_len);
				}
				skb->protocol=eth_type_trans(skb,dev);
				skb->len = pkt_len;
#ifdef __mc68000__
				cache_clear(virt_to_phys(rbd->skb->tail),
						pkt_len);
#endif
				netif_rx(skb);
				lp->stats.rx_packets++;
				lp->stats.rx_bytes+=pkt_len;
			}
		}
		else {
			lp->stats.rx_errors++;
			if ((rfd->stat) & 0x0001)
				lp->stats.collisions++;
			if ((rfd->stat) & 0x0080)
				lp->stats.rx_length_errors++;
			if ((rfd->stat) & 0x0100)
				lp->stats.rx_over_errors++;
			if ((rfd->stat) & 0x0200)
				lp->stats.rx_fifo_errors++;
			if ((rfd->stat) & 0x0400)
				lp->stats.rx_frame_errors++;
			if ((rfd->stat) & 0x0800)
				lp->stats.rx_crc_errors++;
			if ((rfd->stat) & 0x1000)
				lp->stats.rx_length_errors++;
		}

		/* Clear the buffer descriptor count and EOF + F flags */

		if (rbd != (struct i596_rbd *)I596_NULL)
			rbd->count=0;
		else
			printk("%s: Null rbd - oops!\n", dev->name);

		/* Tidy the frame descriptor, marking it as end of list */

		rfd->rbd = (struct i596_rbd *)I596_NULL;
		rfd->stat = 0;
		rfd->cmd = CMD_EOL|CMD_FLEX;
		rfd->count = 0;

		/* Remove end-of-list from old end descriptor */

		lp->rx_tail->cmd = CMD_FLEX;

		/* Update last frame descriptor to reference the one just
		 * processed */

		lp->rx_tail = rfd;

		/* Update record of next frame descriptor to process */

		lp->scb.rfd = rfd->next;
		rfd = WSWAPrfd(lp->scb.rfd);	/* Next frame desc. to check */
	}

	if (i596_debug > 3)
		printk ("frames %d\n", frames);

	return 0;
}


static inline void i596_cleanup_cmd(struct i596_private *lp)
{
	struct i596_cmd *ptr;
	int boguscnt = 1000;

	if (i596_debug > 4)
		printk("i596_cleanup_cmd\n");

	while (lp->cmd_head != (struct i596_cmd *) I596_NULL) {
		ptr = lp->cmd_head;

		lp->cmd_head = WSWAPcmd(lp->cmd_head->next);
		lp->cmd_backlog--;

		switch ((ptr->command) & 0x7) {
		case CmdTx:
			{
				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
				struct sk_buff *skb = tx_cmd->skb;

				dev_kfree_skb(skb);

				lp->stats.tx_errors++;
				lp->stats.tx_aborted_errors++;

				ptr->next = (struct i596_cmd *) I596_NULL;
				tx_cmd->cmd.command = 0;  /* Mark as free */
				break;
			}
		case CmdMulticastList:
			{
				ptr->next = (struct i596_cmd *) I596_NULL;
				break;
			}
		default:
			ptr->next = (struct i596_cmd *) I596_NULL;
		}
	}

	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("i596_cleanup_cmd timed out with status %4.4x, cmd %4.4x.\n",
			       lp->scb.status, lp->scb.command);
			break;
		}
	lp->scb.cmd = WSWAPcmd(lp->cmd_head);
}

static inline void i596_reset(struct net_device *dev, struct i596_private *lp, int ioaddr)
{
	int boguscnt = 1000;
	unsigned long flags;

	if (i596_debug > 1)
		printk("i596_reset\n");

	spin_lock_irqsave (&lp->lock, flags);

	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("i596_reset timed out with status %4.4x, cmd %4.4x.\n",
			       lp->scb.status, lp->scb.command);
			break;
		}

	netif_stop_queue(dev);

	lp->scb.command = CUC_ABORT | RX_ABORT;
	CA(dev);

	/* wait for shutdown */
	boguscnt = 4000;

	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("i596_reset 2 timed out with status %4.4x, cmd %4.4x.\n",
			       lp->scb.status, lp->scb.command);
			break;
		}
	spin_unlock_irqrestore (&lp->lock, flags);

	i596_cleanup_cmd(lp);
	i596_rx(dev);

	netif_start_queue(dev);
	init_i596_mem(dev);
}

static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
{
	struct i596_private *lp = (struct i596_private *) dev->priv;
	int ioaddr = dev->base_addr;
	unsigned long flags;
	int boguscnt = 1000;

	if (i596_debug > 4)
		printk("i596_add_cmd\n");

	cmd->status = 0;
	cmd->command |= (CMD_EOL | CMD_INTR);
	cmd->next = (struct i596_cmd *) I596_NULL;

	spin_lock_irqsave (&lp->lock, flags);

	/*
	 * RGH  300597:  Looks to me like there could be a race condition
	 * here.  Just because we havn't picked up all the command items
	 * yet, doesn't mean that the 82596 hasn't finished processing
	 * them.  So, we may need to do a CUC_START anyway.
	 * Maybe not.  If it interrupts saying the CU is idle when there
	 * is still something in the cmd queue, the int handler with restart
	 * the CU.
	 */

	if (lp->cmd_head != (struct i596_cmd *) I596_NULL) {
		lp->cmd_tail->next = WSWAPcmd(cmd);
	} else {
		lp->cmd_head = cmd;
		while (lp->scb.command)
			if (--boguscnt == 0) {
				printk("i596_add_cmd timed out with status %4.4x, cmd %4.4x.\n",
				       lp->scb.status, lp->scb.command);
				break;
			}
		lp->scb.cmd = WSWAPcmd(cmd);
		lp->scb.command = CUC_START;
		CA(dev);
	}
	lp->cmd_tail = cmd;
	lp->cmd_backlog++;

	lp->cmd_head = WSWAPcmd(lp->scb.cmd);	/* Is this redundant?  RGH 300597 */

	spin_unlock_irqrestore (&lp->lock, flags);

	if (lp->cmd_backlog > max_cmd_backlog) {
		unsigned long tickssofar = jiffies - lp->last_cmd;

		if (tickssofar < ticks_limit)
			return;

		printk("%s: command unit timed out, status resetting.\n", dev->name);

		i596_reset(dev, lp, ioaddr);
	}
}

static int i596_open(struct net_device *dev)
{
	if (i596_debug > 1)
		printk("%s: i596_open() irq %d.\n", dev->name, dev->irq);

	if (request_irq(dev->irq, &i596_interrupt, 0, "i82596", dev))
		return -EAGAIN;
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		if (request_irq(0x56, &i596_error, 0, "i82596_error", dev))
			return -EAGAIN;
	}
#endif
	init_rx_bufs(dev);

	netif_start_queue(dev);

	MOD_INC_USE_COUNT;

	/* Initialize the 82596 memory */
	init_i596_mem(dev);

	return 0;		/* Always succeed */
}

static void i596_tx_timeout (struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *) dev->priv;
	int ioaddr = dev->base_addr;

	/* Transmitter timeout, serious problems. */
	printk ("%s: transmit timed out, status resetting.\n", dev->name);

	lp->stats.tx_errors++;

	/* Try to restart the adaptor */
	if (lp->last_restart == lp->stats.tx_packets) {
		if (i596_debug > 1)
			printk ("Resetting board.\n");

		/* Shutdown and restart */
		i596_reset (dev, lp, ioaddr);
	} else {
		/* Issue a channel attention signal */
		if (i596_debug > 1)
			printk ("Kicking board.\n");
		lp->scb.command = CUC_START | RX_START;
		CA (dev);
		lp->last_restart = lp->stats.tx_packets;
	}

	dev->trans_start = jiffies;
	netif_wake_queue (dev);
}


static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *) dev->priv;
	struct tx_cmd *tx_cmd;
	struct i596_tbd *tbd;

	if (i596_debug > 2)
		printk("%s: 82596 start xmit\n", dev->name);

	if (i596_debug > 3)
		printk("%s: i596_start_xmit(%x,%x) called\n", dev->name,
				skb->len, (unsigned int)skb->data);

	netif_stop_queue(dev);
	
	{
		short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
		dev->trans_start = jiffies;

		tx_cmd = lp->tx_cmds + lp->next_tx_cmd;
		tbd = lp->tbds + lp->next_tx_cmd;

		if (tx_cmd->cmd.command) {
			printk ("%s: xmit ring full, dropping packet.\n",
					dev->name);
			lp->stats.tx_dropped++;

			dev_kfree_skb(skb);
		} else {
			if (++lp->next_tx_cmd == TX_RING_SIZE)
				lp->next_tx_cmd = 0;
			tx_cmd->tbd = WSWAPtbd(tbd);
			tbd->next = (struct i596_tbd *) I596_NULL;

			tx_cmd->cmd.command = CMD_FLEX | CmdTx;
			tx_cmd->skb = skb;

			tx_cmd->pad = 0;
			tx_cmd->size = 0;
			tbd->pad = 0;
			tbd->size = EOF | length;

			tbd->data = WSWAPchar(skb->data);

#ifdef __mc68000__
			cache_push(virt_to_phys(skb->data), length);
#endif
			if (i596_debug > 3)
				print_eth(skb->data);
			i596_add_cmd(dev, (struct i596_cmd *) tx_cmd);

			lp->stats.tx_packets++;
			lp->stats.tx_bytes += length;
		}
	}

	netif_start_queue(dev);

	return 0;
}

static void print_eth(char *add)
{
	int i;

	printk("print_eth(%08x)\n", (unsigned int) add);
	printk("Dest  ");
	for (i = 0; i < 6; i++)
		printk(" %2.2X", (unsigned char) add[i]);
	printk("\n");

	printk("Source");
	for (i = 0; i < 6; i++)
		printk(" %2.2X", (unsigned char) add[i + 6]);
	printk("\n");
	printk("type %2.2X%2.2X\n", (unsigned char) add[12], (unsigned char) add[13]);
}

int __init i82596_probe(struct net_device *dev)
{
	int i;
	struct i596_private *lp;
	char eth_addr[6];

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		static int probed = 0;
#ifdef XXX_FIXME
		if (mvme16x_config & MVME16x_CONFIG_NO_ETHERNET) {
			printk("Ethernet probe disabled - chip not present\n");
			return ENODEV;
		}
#endif
		if (probed)
			return ENODEV;
		probed++;
		memcpy(eth_addr, (void *) 0xfffc1f2c, 6);	/* YUCK! Get addr from NOVRAM */
		dev->base_addr = MVME_I596_BASE;
		dev->irq = (unsigned) MVME16x_IRQ_I596;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *rtc = (unsigned char *) BVME_RTC_BASE;
		unsigned char msr = rtc[3];
		int i;

		rtc[3] |= 0x80;
		for (i = 0; i < 6; i++)
			eth_addr[i] = rtc[i * 4 + 7];	/* Stored in RTC RAM at offset 1 */
		rtc[3] = msr;
		dev->base_addr = BVME_I596_BASE;
		dev->irq = (unsigned) BVME_IRQ_I596;
	}
#endif
#ifdef ENABLE_APRICOT
	int checksum = 0;
	int ioaddr = 0x300;

	/* this is easy the ethernet interface can only be at 0x300 */
	/* first check nothing is already registered here */

	if (check_region(ioaddr, I596_TOTAL_SIZE))
		return ENODEV;

	for (i = 0; i < 8; i++) {
		eth_addr[i] = inb(ioaddr + 8 + i);
		checksum += eth_addr[i];
	}

	/* checksum is a multiple of 0x100, got this wrong first time
	   some machines have 0x100, some 0x200. The DOS driver doesn't
	   even bother with the checksum */

	if (checksum % 0x100)
		return ENODEV;

	/* Some other boards trip the checksum.. but then appear as ether
	   address 0. Trap these - AC */

	if (memcmp(eth_addr, "\x00\x00\x49", 3) != 0)
		return ENODEV;

	request_region(ioaddr, I596_TOTAL_SIZE, "i596");

	dev->base_addr = ioaddr;
	dev->irq = 10;
#endif
	ether_setup(dev);
	printk("%s: 82596 at %#3lx,", dev->name, dev->base_addr);

	for (i = 0; i < 6; i++)
		printk(" %2.2X", dev->dev_addr[i] = eth_addr[i]);

	printk(" IRQ %d.\n", dev->irq);

	if (i596_debug > 0)
		printk(version);

	/* The 82596-specific entries in the device structure. */
	dev->open = i596_open;
	dev->stop = i596_close;
	dev->hard_start_xmit = i596_start_xmit;
	dev->get_stats = i596_get_stats;
	dev->set_multicast_list = set_multicast_list;
	dev->tx_timeout = i596_tx_timeout;
	dev->watchdog_timeo = TX_TIMEOUT;
	

	dev->mem_start = (int)__get_free_pages(GFP_ATOMIC, 0);
	dev->priv = (void *)(dev->mem_start);

	lp = (struct i596_private *) dev->priv;
	if (i596_debug)
		printk ("%s: lp at 0x%08lx (%d bytes), lp->scb at 0x%08lx\n",
			dev->name, (unsigned long)lp,
			sizeof(struct i596_private), (unsigned long)&lp->scb);
	memset((void *) lp, 0, sizeof(struct i596_private));

#ifdef __mc68000__
	cache_push(virt_to_phys((void *)(dev->mem_start)), 4096);
	cache_clear(virt_to_phys((void *)(dev->mem_start)), 4096);
	kernel_set_cachemode((void *)(dev->mem_start), 4096, IOMAP_NOCACHE_SER);
#endif
	lp->scb.command = 0;
	lp->scb.cmd = (struct i596_cmd *) I596_NULL;
	lp->scb.rfd = (struct i596_rfd *) I596_NULL;
	lp->lock = SPIN_LOCK_UNLOCKED;

	return 0;
}

static void i596_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = dev_id;
	struct i596_private *lp;
	short ioaddr;
	int boguscnt = 2000;
	unsigned short status, ack_cmd = 0;

#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		if (*(char *) BVME_LOCAL_IRQ_STAT & BVME_ETHERR) {
			i596_error(BVME_IRQ_I596, NULL, NULL);
			return;
		}
	}
#endif
	if (dev == NULL) {
		printk("i596_interrupt(): irq %d for unknown device.\n", irq);
		return;
	}
	if (i596_debug > 3)
		printk("%s: i596_interrupt(): irq %d\n", dev->name, irq);

	ioaddr = dev->base_addr;
	lp = (struct i596_private *) dev->priv;
	
	spin_lock (&lp->lock);

	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("%s: i596 interrupt, timeout status %4.4x command %4.4x.\n", dev->name, lp->scb.status, lp->scb.command);
			break;
		}
	status = lp->scb.status;

	if (i596_debug > 4)
		printk("%s: i596 interrupt, status %4.4x.\n", dev->name, status);

	ack_cmd = status & 0xf000;

	if ((status & 0x8000) || (status & 0x2000)) {
		struct i596_cmd *ptr;

		if ((i596_debug > 4) && (status & 0x8000))
			printk("%s: i596 interrupt completed command.\n", dev->name);
		if ((i596_debug > 4) && (status & 0x2000))
			printk("%s: i596 interrupt command unit inactive %x.\n", dev->name, status & 0x0700);

		while ((lp->cmd_head != (struct i596_cmd *) I596_NULL) && (lp->cmd_head->status & STAT_C)) {
			ptr = lp->cmd_head;

			if (i596_debug > 2)
				printk("cmd_head->status = %04x, ->command = %04x\n",
				       lp->cmd_head->status, lp->cmd_head->command);
			lp->cmd_head = WSWAPcmd(lp->cmd_head->next);
			lp->cmd_backlog--;

			switch ((ptr->command) & 0x7) {
			case CmdTx:
				{
					struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
					struct sk_buff *skb = tx_cmd->skb;

					if ((ptr->status) & STAT_OK) {
						if (i596_debug > 2)
							print_eth(skb->data);
					} else {
						lp->stats.tx_errors++;
						if ((ptr->status) & 0x0020)
							lp->stats.collisions++;
						if (!((ptr->status) & 0x0040))
							lp->stats.tx_heartbeat_errors++;
						if ((ptr->status) & 0x0400)
							lp->stats.tx_carrier_errors++;
						if ((ptr->status) & 0x0800)
							lp->stats.collisions++;
						if ((ptr->status) & 0x1000)
							lp->stats.tx_aborted_errors++;
					}

					dev_kfree_skb(skb);

					ptr->next = (struct i596_cmd *) I596_NULL;
					tx_cmd->cmd.command = 0; /* Mark free */
					break;
				}
			case CmdMulticastList:
				{
					ptr->next = (struct i596_cmd *) I596_NULL;
					break;
				}
			case CmdTDR:
				{
					unsigned long status = *((unsigned long *) (ptr + 1));

					if (status & 0x8000) {
						if (i596_debug > 3)
							printk("%s: link ok.\n", dev->name);
					} else {
						if (status & 0x4000)
							printk("%s: Transceiver problem.\n", dev->name);
						if (status & 0x2000)
							printk("%s: Termination problem.\n", dev->name);
						if (status & 0x1000)
							printk("%s: Short circuit.\n", dev->name);

						if (i596_debug > 1)
							printk("%s: Time %ld.\n", dev->name, status & 0x07ff);
					}
					break;
				}
			case CmdConfigure:
				{
					ptr->next = (struct i596_cmd *) I596_NULL;
					/* Zap command so set_multicast_list() knows it is free */
					ptr->command = 0;
					break;
				}
			default:
				ptr->next = (struct i596_cmd *) I596_NULL;
			}
			lp->last_cmd = jiffies;
		}

		ptr = lp->cmd_head;
		while ((ptr != (struct i596_cmd *) I596_NULL) && (ptr != lp->cmd_tail)) {
			ptr->command &= 0x1fff;
			ptr = WSWAPcmd(ptr->next);
		}

		if ((lp->cmd_head != (struct i596_cmd *) I596_NULL) &&
		    netif_running(dev))
			ack_cmd |= CUC_START;
		lp->scb.cmd = WSWAPcmd(lp->cmd_head);
	}
	if ((status & 0x1000) || (status & 0x4000)) {
		if ((i596_debug > 4) && (status & 0x4000))
			printk("%s: i596 interrupt received a frame.\n", dev->name);
		/* Only RX_START if stopped - RGH 07-07-96 */
		if (status & 0x1000) {
			if (netif_running(dev))
				ack_cmd |= RX_START;
			if (i596_debug > 1)
				printk("%s: i596 interrupt receive unit inactive %x.\n", dev->name, status & 0x00f0);
		}
		i596_rx(dev);
	}
	/* acknowledge the interrupt */

/*      COMMENTED OUT <<<<<
   if ((lp->scb.cmd != (struct i596_cmd *) I596_NULL) && (dev->start))
   ack_cmd |= CUC_START;
 */
	boguscnt = 1000;
	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("%s: i596 interrupt, timeout status %4.4x command %4.4x.\n", dev->name, lp->scb.status, lp->scb.command);
			break;
		}
	lp->scb.command = ack_cmd;

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		/* Ack the interrupt */

		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		pcc2[0x2a] |= 0x08;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 1;
		*ethirq = 3;
	}
#endif
#ifdef ENABLE_APRICOT
	(void) inb(ioaddr + 0x10);
	outb(4, ioaddr + 0xf);
#endif
	CA(dev);

	if (i596_debug > 4)
		printk("%s: exiting interrupt.\n", dev->name);

	spin_unlock (&lp->lock);
	
	return;
}

static int i596_close(struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *) dev->priv;
	int boguscnt = 2000;
	unsigned long flags;

	netif_stop_queue(dev);

	if (i596_debug > 1)
		printk("%s: Shutting down ethercard, status was %4.4x.\n",
		       dev->name, lp->scb.status);

	save_flags(flags);
	cli();

	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("%s: close1 timed out with status %4.4x, cmd %4.4x.\n",
			     dev->name, lp->scb.status, lp->scb.command);
			break;
		}
	lp->scb.command = CUC_ABORT | RX_ABORT;
	CA(dev);

	boguscnt = 2000;

	while (lp->scb.command)
		if (--boguscnt == 0) {
			printk("%s: close2 timed out with status %4.4x, cmd %4.4x.\n",
			     dev->name, lp->scb.status, lp->scb.command);
			break;
		}
	restore_flags(flags);

	i596_cleanup_cmd(lp);

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		/* Disable all ints */
		pcc2[0x28] = 1;
		pcc2[0x2a] = 0x40;
		pcc2[0x2b] = 0x40;	/* Set snooping bits now! */
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 1;
	}
#endif

	free_irq(dev->irq, dev);
	remove_rx_bufs(dev);
	MOD_DEC_USE_COUNT;

	return 0;
}

static struct net_device_stats *
 i596_get_stats(struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *) dev->priv;

	return &lp->stats;
}

/*
 *    Set or clear the multicast filter for this adaptor.
 */

static void set_multicast_list(struct net_device *dev)
{
	struct i596_private *lp = (struct i596_private *) dev->priv;
	struct i596_cmd *cmd;
	int config = 0, cnt;

	if (i596_debug > 1)
		printk("%s: set multicast list, %d entries, promisc %s, allmulti %s\n", dev->name, dev->mc_count, dev->flags & IFF_PROMISC ? "ON" : "OFF", dev->flags & IFF_ALLMULTI ? "ON" : "OFF");

	if ((dev->flags & IFF_PROMISC) && !(lp->i596_config[8] & 0x01)) {
		lp->i596_config[8] |= 0x01;
		config = 1;
	}
	if (!(dev->flags & IFF_PROMISC) && (lp->i596_config[8] & 0x01)) {
		lp->i596_config[8] &= ~0x01;
		config = 1;
	}
	if ((dev->flags & IFF_ALLMULTI) && (lp->i596_config[11] & 0x20)) {
		lp->i596_config[11] &= ~0x20;
		config = 1;
	}
	if (!(dev->flags & IFF_ALLMULTI) && !(lp->i596_config[11] & 0x20)) {
		lp->i596_config[11] |= 0x20;
		config = 1;
	}
	if (config) {
		if (lp->set_conf.command)
			printk("%s: config change request already queued\n",
			       dev->name);
		else {
			lp->set_conf.command = CmdConfigure;
			i596_add_cmd(dev, &lp->set_conf);
		}
	}

	cnt = dev->mc_count;
	if (cnt > MAX_MC_CNT)
	{
		cnt = MAX_MC_CNT;
		printk("%s: Only %d multicast addresses supported",
			dev->name, cnt);
	}
	
	if (dev->mc_count > 0) {
		struct dev_mc_list *dmi;
		unsigned char *cp;

		cmd = &lp->mc_cmd;
		cmd->command = CmdMulticastList;
		*((unsigned short *) (cmd + 1)) = dev->mc_count * 6;
		cp = ((unsigned char *) (cmd + 1)) + 2;
		for(dmi=dev->mc_list;cnt && dmi!=NULL;dmi=dmi->next,cnt--) {
			memcpy(cp, dmi->dmi_addr, 6);
			if (i596_debug > 1)
				printk("%s: Adding address %02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, *(cp + 0), *(cp + 1), *(cp + 2), *(cp + 3), *(cp + 4), *(cp + 5));
			cp += 6;
		}
		if (i596_debug > 2)
			print_eth(((char *) (cmd + 1)) + 2);
		i596_add_cmd(dev, cmd);
	}
}

#ifdef HAVE_DEVLIST
static unsigned int i596_portlist[] __initdata =
{0x300, 0};
struct netdev_entry i596_drv =
{"i82596", i82596_probe, I596_TOTAL_SIZE, i596_portlist};
#endif

#ifdef MODULE
static char devicename[9] =
{0,};
static struct net_device dev_82596 =
{
	devicename,	/* device name inserted by drivers/net/net_init.c */
	0, 0, 0, 0,
	0, 0,		/* base, irq */
	0, 0, 0, NULL, i82596_probe};

#ifdef ENABLE_APRICOT
static int io = 0x300;
static int irq = 10;
MODULE_PARM(irq, "i");
#endif

MODULE_PARM(debug, "i");
static int debug = -1;

int init_module(void)
{
#ifdef ENABLE_APRICOT
	dev_82596.base_addr = io;
	dev_82596.irq = irq;
#endif
	if (debug >= 0)
		i596_debug = debug;
	if (register_netdev(&dev_82596) != 0)
		return -EIO;
	return 0;
}

void cleanup_module(void)
{
	unregister_netdev(&dev_82596);
#ifdef __mc68000__
	/* XXX This assumes default cache mode to be IOMAP_FULL_CACHING,
	 * XXX which may be invalid (CONFIG_060_WRITETHROUGH)
	 */

	kernel_set_cachemode((u32)(dev_82596.mem_start), 4096,
			IOMAP_FULL_CACHING);
#endif
	free_page ((u32)(dev_82596.mem_start));
	dev_82596.priv = NULL;
#ifdef ENABLE_APRICOT
	/* If we don't do this, we can't re-insmod it later. */
	release_region(dev_82596.base_addr, I596_TOTAL_SIZE);
#endif
}

#endif				/* MODULE */

/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c 82596.c"
 * End:
 */