// SPDX-License-Identifier: GPL-1.0+
/* 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
   * performance 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.

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

 */

#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/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/gfp.h>
#include <linux/pgtable.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/cacheflush.h>

static char version[] __initdata =
        "82596.c $Revision: 1.5 $\n";

#define DRV_NAME        "82596"

/* DEBUG flags
 */

#define DEB_INIT        0x0001
#define DEB_PROBE       0x0002
#define DEB_SERIOUS     0x0004
#define DEB_ERRORS      0x0008
#define DEB_MULTI       0x0010
#define DEB_TDR         0x0020
#define DEB_OPEN        0x0040
#define DEB_RESET       0x0080
#define DEB_ADDCMD      0x0100
#define DEB_STATUS      0x0200
#define DEB_STARTTX     0x0400
#define DEB_RXADDR      0x0800
#define DEB_TXADDR      0x1000
#define DEB_RXFRAME     0x2000
#define DEB_INTS        0x4000
#define DEB_STRUCT      0x8000
#define DEB_ANY         0xffff


#define DEB(x,y)        if (i596_debug & (x)) y


#if IS_ENABLED(CONFIG_MVME16x_NET)
#define ENABLE_MVME16x_NET
#endif
#if IS_ENABLED(CONFIG_BVME6000_NET)
#define ENABLE_BVME6000_NET
#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
#else
#error 82596.c: unknown architecture
#endif

/*
 * These were the intel versions, left here for reference. There
 * are currently no x86 users of this legacy i82596 chip.
 */
#if 0
#define WSWAPrfd(x)     ((struct i596_rfd *)((long)x))
#define WSWAPrbd(x)     ((struct i596_rbd *)((long)x))
#define WSWAPiscp(x)    ((struct i596_iscp *)((long)x))
#define WSWAPscb(x)     ((struct i596_scb *)((long)x))
#define WSWAPcmd(x)     ((struct i596_cmd *)((long)x))
#define WSWAPtbd(x)     ((struct i596_tbd *)((long)x))
#define WSWAPchar(x)    ((char *)((long)x))
#define ISCP_BUSY       0x0001
#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 */

static int i596_debug = (DEB_SERIOUS|DEB_PROBE);

MODULE_AUTHOR("Richard Hirst");
MODULE_DESCRIPTION("i82596 driver");
MODULE_LICENSE("GPL");

module_param(i596_debug, int, 0);
MODULE_PARM_DESC(i596_debug, "i82596 debug mask");


/* 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 ((void *)0xffffffff)

#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      (HZ/20)


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

#define EOF             0x8000
#define SIZE_MASK       0x3fff

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

/* The command structure has two 'next' pointers; v_next is the address of
 * the next command as seen by the CPU, b_next is the address of the next
 * command as seen by the 82596.  The b_next pointer, as used by the 82596
 * always references the status field of the next command, rather than the
 * v_next field, because the 82596 is unaware of v_next.  It may seem more
 * logical to put v_next at the end of the structure, but we cannot do that
 * because the 82596 expects other fields to be there, depending on command
 * type.
 */

struct i596_cmd {
        struct i596_cmd *v_next;        /* Address from CPUs viewpoint */
        unsigned short status;
        unsigned short command;
        struct i596_cmd *b_next;        /* Address from i596 viewpoint */
};

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 tdr_cmd {
        struct i596_cmd cmd;
        unsigned short status;
        unsigned short pad;
};

struct mc_cmd {
        struct i596_cmd cmd;
        short mc_cnt;
        char mc_addrs[MAX_MC_CNT*6];
};

struct sa_cmd {
        struct i596_cmd cmd;
        char eth_addr[8];
};

struct cf_cmd {
        struct i596_cmd cmd;
        char i596_config[16];
};

struct i596_rfd {
        unsigned short stat;
        unsigned short cmd;
        struct i596_rfd *b_next;        /* Address from i596 viewpoint */
        struct i596_rbd *rbd;
        unsigned short count;
        unsigned short size;
        struct i596_rfd *v_next;        /* Address from CPUs viewpoint */
        struct i596_rfd *v_prev;
};

struct i596_rbd {
    unsigned short count;
    unsigned short zero1;
    struct i596_rbd *b_next;
    unsigned char *b_data;              /* Address from i596 viewpoint */
    unsigned short size;
    unsigned short zero2;
    struct sk_buff *skb;
    struct i596_rbd *v_next;
    struct i596_rbd *b_addr;            /* This rbd addr from i596 view */
    unsigned char *v_data;              /* Address from CPUs viewpoint */
};

#define TX_RING_SIZE 64
#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 sa_cmd sa_cmd;
        struct cf_cmd cf_cmd;
        struct tdr_cmd tdr_cmd;
        struct mc_cmd mc_cmd;
        unsigned long stat;
        int last_restart __attribute__((aligned(4)));
        struct i596_rfd *rfd_head;
        struct i596_rbd *rbd_head;
        struct i596_cmd *cmd_tail;
        struct i596_cmd *cmd_head;
        int cmd_backlog;
        unsigned long last_cmd;
        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;
};

static 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 netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t i596_interrupt(int irq, void *dev_id);
static int i596_close(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, unsigned int txqueue);
static void print_eth(unsigned char *buf, char *str);
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 = TX_RING_SIZE-1;


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;

                i = *(volatile u32 *) (dev->base_addr);
        }
#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
}


static inline int wait_istat(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
        while (--delcnt && lp->iscp.stat)
                udelay(10);
        if (!delcnt) {
                printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
                     dev->name, str, lp->scb.status, lp->scb.command);
                return -1;
        }
        else
                return 0;
}


static inline int wait_cmd(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
        while (--delcnt && lp->scb.command)
                udelay(10);
        if (!delcnt) {
                printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
                     dev->name, str, lp->scb.status, lp->scb.command);
                return -1;
        }
        else
                return 0;
}


static inline int wait_cfg(struct net_device *dev, struct i596_cmd *cmd, int delcnt, char *str)
{
        volatile struct i596_cmd *c = cmd;

        while (--delcnt && c->command)
                udelay(10);
        if (!delcnt) {
                printk(KERN_ERR "%s: %s.\n", dev->name, str);
                return -1;
        }
        else
                return 0;
}


static void i596_display_data(struct net_device *dev)
{
        struct i596_private *lp = dev->ml_priv;
        struct i596_cmd *cmd;
        struct i596_rfd *rfd;
        struct i596_rbd *rbd;

        printk(KERN_ERR "lp and scp at %p, .sysbus = %08lx, .iscp = %p\n",
               &lp->scp, lp->scp.sysbus, lp->scp.iscp);
        printk(KERN_ERR "iscp at %p, iscp.stat = %08lx, .scb = %p\n",
               &lp->iscp, lp->iscp.stat, lp->iscp.scb);
        printk(KERN_ERR "scb at %p, scb.status = %04x, .command = %04x,"
                " .cmd = %p, .rfd = %p\n",
               &lp->scb, lp->scb.status, lp->scb.command,
                lp->scb.cmd, lp->scb.rfd);
        printk(KERN_ERR "   errors: crc %lx, align %lx, resource %lx,"
               " over %lx, rcvdt %lx, short %lx\n",
                lp->scb.crc_err, lp->scb.align_err, lp->scb.resource_err,
                lp->scb.over_err, lp->scb.rcvdt_err, lp->scb.short_err);
        cmd = lp->cmd_head;
        while (cmd != I596_NULL) {
                printk(KERN_ERR "cmd at %p, .status = %04x, .command = %04x, .b_next = %p\n",
                  cmd, cmd->status, cmd->command, cmd->b_next);
                cmd = cmd->v_next;
        }
        rfd = lp->rfd_head;
        printk(KERN_ERR "rfd_head = %p\n", rfd);
        do {
                printk(KERN_ERR "   %p .stat %04x, .cmd %04x, b_next %p, rbd %p,"
                        " count %04x\n",
                        rfd, rfd->stat, rfd->cmd, rfd->b_next, rfd->rbd,
                        rfd->count);
                rfd = rfd->v_next;
        } while (rfd != lp->rfd_head);
        rbd = lp->rbd_head;
        printk(KERN_ERR "rbd_head = %p\n", rbd);
        do {
                printk(KERN_ERR "   %p .count %04x, b_next %p, b_data %p, size %04x\n",
                        rbd, rbd->count, rbd->b_next, rbd->b_data, rbd->size);
                rbd = rbd->v_next;
        } while (rbd != lp->rbd_head);
}


#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
static irqreturn_t i596_error(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
#ifdef ENABLE_MVME16x_NET
        if (MACH_IS_MVME16x) {
                volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

                pcc2[0x28] = 1;
                pcc2[0x2b] = 0x1d;
        }
#endif
#ifdef ENABLE_BVME6000_NET
        if (MACH_IS_BVME6000) {
                volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

                *ethirq = 1;
                *ethirq = 3;
        }
#endif
        printk(KERN_ERR "%s: Error interrupt\n", dev->name);
        i596_display_data(dev);
        return IRQ_HANDLED;
}
#endif

static inline void remove_rx_bufs(struct net_device *dev)
{
        struct i596_private *lp = dev->ml_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);
                rbd->skb = NULL;
        }
}

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

        /* First build the Receive Buffer Descriptor List */

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

                if (skb == NULL) {
                        remove_rx_bufs(dev);
                        return -ENOMEM;
                }

                rbd->v_next = rbd+1;
                rbd->b_next = WSWAPrbd(virt_to_bus(rbd+1));
                rbd->b_addr = WSWAPrbd(virt_to_bus(rbd));
                rbd->skb = skb;
                rbd->v_data = skb->data;
                rbd->b_data = WSWAPchar(virt_to_bus(skb->data));
                rbd->size = PKT_BUF_SZ;
#ifdef __mc68000__
                cache_clear(virt_to_phys(skb->data), PKT_BUF_SZ);
#endif
        }
        lp->rbd_head = lp->rbds;
        rbd = lp->rbds + rx_ring_size - 1;
        rbd->v_next = lp->rbds;
        rbd->b_next = WSWAPrbd(virt_to_bus(lp->rbds));

        /* Now build the Receive Frame Descriptor List */

        for (i = 0, rfd = lp->rfds; i < rx_ring_size; i++, rfd++) {
                rfd->rbd = I596_NULL;
                rfd->v_next = rfd+1;
                rfd->v_prev = rfd-1;
                rfd->b_next = WSWAPrfd(virt_to_bus(rfd+1));
                rfd->cmd = CMD_FLEX;
        }
        lp->rfd_head = lp->rfds;
        lp->scb.rfd = WSWAPrfd(virt_to_bus(lp->rfds));
        rfd = lp->rfds;
        rfd->rbd = lp->rbd_head;
        rfd->v_prev = lp->rfds + rx_ring_size - 1;
        rfd = lp->rfds + rx_ring_size - 1;
        rfd->v_next = lp->rfds;
        rfd->b_next = WSWAPrfd(virt_to_bus(lp->rfds));
        rfd->cmd = CMD_EOL|CMD_FLEX;

        return 0;
}


static void rebuild_rx_bufs(struct net_device *dev)
{
        struct i596_private *lp = dev->ml_priv;
        int i;

        /* Ensure rx frame/buffer descriptors are tidy */

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


static int init_i596_mem(struct net_device *dev)
{
        struct i596_private *lp = dev->ml_priv;
        unsigned long flags;

        MPU_PORT(dev, PORT_RESET, NULL);

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

#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] = 0x48;
                /* 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] = 0x08;
        }
#endif
#ifdef ENABLE_BVME6000_NET
        if (MACH_IS_BVME6000) {
                volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

                *ethirq = 1;
        }
#endif

        /* change the scp address */

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

#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

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

        lp->cmd_head = lp->scb.cmd = I596_NULL;

#ifdef ENABLE_BVME6000_NET
        if (MACH_IS_BVME6000) {
                lp->scb.t_on  = 7 * 25;
                lp->scb.t_off = 1 * 25;
        }
#endif

        DEB(DEB_INIT,printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));

        CA(dev);

        if (wait_istat(dev,lp,1000,"initialization timed out"))
                goto failed;
        DEB(DEB_INIT,printk(KERN_DEBUG "%s: i82596 initialization successful\n", dev->name));

        /* Ensure rx frame/buffer descriptors are tidy */
        rebuild_rx_bufs(dev);
        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] = 0x55;      /* Edge sensitive */
                pcc2[0x2b] = 0x15;
        }
#endif
#ifdef ENABLE_BVME6000_NET
        if (MACH_IS_BVME6000) {
                volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

                *ethirq = 3;
        }
#endif


        DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdConfigure\n", dev->name));
        memcpy(lp->cf_cmd.i596_config, init_setup, 14);
        lp->cf_cmd.cmd.command = CmdConfigure;
        i596_add_cmd(dev, &lp->cf_cmd.cmd);

        DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
        memcpy(lp->sa_cmd.eth_addr, dev->dev_addr, ETH_ALEN);
        lp->sa_cmd.cmd.command = CmdSASetup;
        i596_add_cmd(dev, &lp->sa_cmd.cmd);

        DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
        lp->tdr_cmd.cmd.command = CmdTDR;
        i596_add_cmd(dev, &lp->tdr_cmd.cmd);

        spin_lock_irqsave (&lp->lock, flags);

        if (wait_cmd(dev,lp,1000,"timed out waiting to issue RX_START")) {
                spin_unlock_irqrestore (&lp->lock, flags);
                goto failed;
        }
        DEB(DEB_INIT,printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
        lp->scb.command = RX_START;
        CA(dev);

        spin_unlock_irqrestore (&lp->lock, flags);

        if (wait_cmd(dev,lp,1000,"RX_START not processed"))
                goto failed;
        DEB(DEB_INIT,printk(KERN_DEBUG "%s: Receive unit started OK\n", dev->name));
        return 0;

failed:
        printk(KERN_CRIT "%s: Failed to initialise 82596\n", dev->name);
        MPU_PORT(dev, PORT_RESET, NULL);
        return -1;
}

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

        DEB(DEB_RXFRAME,printk(KERN_DEBUG "i596_rx(), rfd_head %p, rbd_head %p\n",
                        lp->rfd_head, lp->rbd_head));

        rfd = lp->rfd_head;             /* Ref next frame to check */

        while ((rfd->stat) & STAT_C) {  /* Loop while complete frames */
                if (rfd->rbd == I596_NULL)
                        rbd = I596_NULL;
                else if (rfd->rbd == lp->rbd_head->b_addr)
                        rbd = lp->rbd_head;
                else {
                        printk(KERN_CRIT "%s: rbd chain broken!\n", dev->name);
                        /* XXX Now what? */
                        rbd = I596_NULL;
                }
                DEB(DEB_RXFRAME, printk(KERN_DEBUG "  rfd %p, rfd.rbd %p, rfd.stat %04x\n",
                        rfd, rfd->rbd, rfd->stat));

                if (rbd != I596_NULL && ((rfd->stat) & STAT_OK)) {
                        /* a good frame */
                        int pkt_len = rbd->count & 0x3fff;
                        struct sk_buff *skb = rbd->skb;
                        int rx_in_place = 0;

                        DEB(DEB_RXADDR,print_eth(rbd->v_data, "received"));
                        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;

                                /* Get fresh skbuff to replace filled one. */
                                newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
                                if (newskb == NULL) {
                                        skb = NULL;     /* drop pkt */
                                        goto memory_squeeze;
                                }
                                /* Pass up the skb already on the Rx ring. */
                                skb_put(skb, pkt_len);
                                rx_in_place = 1;
                                rbd->skb = newskb;
                                rbd->v_data = newskb->data;
                                rbd->b_data = WSWAPchar(virt_to_bus(newskb->data));
#ifdef __mc68000__
                                cache_clear(virt_to_phys(newskb->data), PKT_BUF_SZ);
#endif
                        } else {
                                skb = netdev_alloc_skb(dev, pkt_len + 2);
                        }
memory_squeeze:
                        if (skb == NULL) {
                                /* XXX tulip.c can defer packets here!! */
                                dev->stats.rx_dropped++;
                        } else {
                                if (!rx_in_place) {
                                        /* 16 byte align the data fields */
                                        skb_reserve(skb, 2);
                                        skb_put_data(skb, rbd->v_data,
                                                     pkt_len);
                                }
                                skb->protocol=eth_type_trans(skb,dev);
                                skb->len = pkt_len;
#ifdef __mc68000__
                                cache_clear(virt_to_phys(rbd->skb->data),
                                                pkt_len);
#endif
                                netif_rx(skb);
                                dev->stats.rx_packets++;
                                dev->stats.rx_bytes+=pkt_len;
                        }
                }
                else {
                        DEB(DEB_ERRORS, printk(KERN_DEBUG "%s: Error, rfd.stat = 0x%04x\n",
                                        dev->name, rfd->stat));
                        dev->stats.rx_errors++;
                        if ((rfd->stat) & 0x0001)
                                dev->stats.collisions++;
                        if ((rfd->stat) & 0x0080)
                                dev->stats.rx_length_errors++;
                        if ((rfd->stat) & 0x0100)
                                dev->stats.rx_over_errors++;
                        if ((rfd->stat) & 0x0200)
                                dev->stats.rx_fifo_errors++;
                        if ((rfd->stat) & 0x0400)
                                dev->stats.rx_frame_errors++;
                        if ((rfd->stat) & 0x0800)
                                dev->stats.rx_crc_errors++;
                        if ((rfd->stat) & 0x1000)
                                dev->stats.rx_length_errors++;
                }

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

                if (rbd != I596_NULL && (rbd->count & 0x4000)) {
                        rbd->count = 0;
                        lp->rbd_head = rbd->v_next;
                }

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

                rfd->rbd = I596_NULL;
                rfd->stat = 0;
                rfd->cmd = CMD_EOL|CMD_FLEX;
                rfd->count = 0;

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

                rfd->v_prev->cmd = CMD_FLEX;

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

                lp->scb.rfd = rfd->b_next;
                lp->rfd_head = rfd->v_next;
                rfd = lp->rfd_head;
        }

        DEB(DEB_RXFRAME,printk(KERN_DEBUG "frames %d\n", frames));

        return 0;
}


static void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
{
        struct i596_cmd *ptr;

        while (lp->cmd_head != I596_NULL) {
                ptr = lp->cmd_head;
                lp->cmd_head = ptr->v_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);

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

                                ptr->v_next = ptr->b_next = I596_NULL;
                                tx_cmd->cmd.command = 0;  /* Mark as free */
                                break;
                        }
                default:
                        ptr->v_next = ptr->b_next = I596_NULL;
                }
        }

        wait_cmd(dev,lp,100,"i596_cleanup_cmd timed out");
        lp->scb.cmd = I596_NULL;
}

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

        DEB(DEB_RESET,printk(KERN_DEBUG "i596_reset\n"));

        spin_lock_irqsave (&lp->lock, flags);

        wait_cmd(dev,lp,100,"i596_reset timed out");

        netif_stop_queue(dev);

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

        /* wait for shutdown */
        wait_cmd(dev,lp,1000,"i596_reset 2 timed out");
        spin_unlock_irqrestore (&lp->lock, flags);

        i596_cleanup_cmd(dev,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 = dev->ml_priv;
        int ioaddr = dev->base_addr;
        unsigned long flags;

        DEB(DEB_ADDCMD,printk(KERN_DEBUG "i596_add_cmd\n"));

        cmd->status = 0;
        cmd->command |= (CMD_EOL | CMD_INTR);
        cmd->v_next = cmd->b_next = I596_NULL;

        spin_lock_irqsave (&lp->lock, flags);

        if (lp->cmd_head != I596_NULL) {
                lp->cmd_tail->v_next = cmd;
                lp->cmd_tail->b_next = WSWAPcmd(virt_to_bus(&cmd->status));
        } else {
                lp->cmd_head = cmd;
                wait_cmd(dev,lp,100,"i596_add_cmd timed out");
                lp->scb.cmd = WSWAPcmd(virt_to_bus(&cmd->status));
                lp->scb.command = CUC_START;
                CA(dev);
        }
        lp->cmd_tail = cmd;
        lp->cmd_backlog++;

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

                i596_reset(dev, lp, ioaddr);
        }
}

static int i596_open(struct net_device *dev)
{
        int res = 0;

        DEB(DEB_OPEN,printk(KERN_DEBUG "%s: i596_open() irq %d.\n", dev->name, dev->irq));

        if (request_irq(dev->irq, i596_interrupt, 0, "i82596", dev)) {
                printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
                return -EAGAIN;
        }
#ifdef ENABLE_MVME16x_NET
        if (MACH_IS_MVME16x) {
                if (request_irq(0x56, i596_error, 0, "i82596_error", dev)) {
                        res = -EAGAIN;
                        goto err_irq_dev;
                }
        }
#endif
        res = init_rx_bufs(dev);
        if (res)
                goto err_irq_56;

        netif_start_queue(dev);

        if (init_i596_mem(dev)) {
                res = -EAGAIN;
                goto err_queue;
        }

        return 0;

err_queue:
        netif_stop_queue(dev);
        remove_rx_bufs(dev);
err_irq_56:
#ifdef ENABLE_MVME16x_NET
        free_irq(0x56, dev);
err_irq_dev:
#endif
        free_irq(dev->irq, dev);

        return res;
}

static void i596_tx_timeout (struct net_device *dev, unsigned int txqueue)
{
        struct i596_private *lp = dev->ml_priv;
        int ioaddr = dev->base_addr;

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

        dev->stats.tx_errors++;

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

        netif_trans_update(dev); /* prevent tx timeout */
        netif_wake_queue (dev);
}

static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct i596_private *lp = dev->ml_priv;
        struct tx_cmd *tx_cmd;
        struct i596_tbd *tbd;
        short length = skb->len;

        DEB(DEB_STARTTX,printk(KERN_DEBUG "%s: i596_start_xmit(%x,%p) called\n",
                                dev->name, skb->len, skb->data));

        if (skb->len < ETH_ZLEN) {
                if (skb_padto(skb, ETH_ZLEN))
                        return NETDEV_TX_OK;
                length = ETH_ZLEN;
        }
        netif_stop_queue(dev);

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

        if (tx_cmd->cmd.command) {
                printk(KERN_NOTICE "%s: xmit ring full, dropping packet.\n",
                                dev->name);
                dev->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(virt_to_bus(tbd));
                tbd->next = 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(virt_to_bus(skb->data));

#ifdef __mc68000__
                cache_push(virt_to_phys(skb->data), length);
#endif
                DEB(DEB_TXADDR,print_eth(skb->data, "tx-queued"));
                i596_add_cmd(dev, &tx_cmd->cmd);

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

        netif_start_queue(dev);

        return NETDEV_TX_OK;
}

static void print_eth(unsigned char *add, char *str)
{
        printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
               add, add + 6, add, add[12], add[13], str);
}

static const struct net_device_ops i596_netdev_ops = {
        .ndo_open               = i596_open,
        .ndo_stop               = i596_close,
        .ndo_start_xmit         = i596_start_xmit,
        .ndo_set_rx_mode        = set_multicast_list,
        .ndo_tx_timeout         = i596_tx_timeout,
        .ndo_set_mac_address    = eth_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
};

static struct net_device * __init i82596_probe(void)
{
        struct net_device *dev;
        int i;
        struct i596_private *lp;
        char eth_addr[8];
        static int probed;
        int err;

        if (probed)
                return ERR_PTR(-ENODEV);
        probed++;

        dev = alloc_etherdev(0);
        if (!dev)
                return ERR_PTR(-ENOMEM);

#ifdef ENABLE_MVME16x_NET
        if (MACH_IS_MVME16x) {
                if (mvme16x_config & MVME16x_CONFIG_NO_ETHERNET) {
                        printk(KERN_NOTICE "Ethernet probe disabled - chip not present\n");
                        err = -ENODEV;
                        goto out;
                }
                memcpy(eth_addr, absolute_pointer(0xfffc1f2c), ETH_ALEN); /* YUCK! Get addr from NOVRAM */
                dev->base_addr = MVME_I596_BASE;
                dev->irq = (unsigned) MVME16x_IRQ_I596;
                goto found;
        }
#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;
                goto found;
        }
#endif
        err = -ENODEV;
        goto out;

found:
        dev->mem_start = (int)__get_free_pages(GFP_ATOMIC, 0);
        if (!dev->mem_start) {
                err = -ENOMEM;
                goto out1;
        }

        DEB(DEB_PROBE,printk(KERN_INFO "%s: 82596 at %#3lx,", dev->name, dev->base_addr));

        for (i = 0; i < 6; i++)
                DEB(DEB_PROBE,printk(" %2.2X", eth_addr[i]));
        eth_hw_addr_set(dev, eth_addr);

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

        DEB(DEB_PROBE,printk(KERN_INFO "%s", version));

        /* The 82596-specific entries in the device structure. */
        dev->netdev_ops = &i596_netdev_ops;
        dev->watchdog_timeo = TX_TIMEOUT;

        dev->ml_priv = (void *)(dev->mem_start);

        lp = dev->ml_priv;
        DEB(DEB_INIT,printk(KERN_DEBUG "%s: lp at 0x%08lx (%zd 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 = I596_NULL;
        lp->scb.rfd = I596_NULL;
        spin_lock_init(&lp->lock);

        err = register_netdev(dev);
        if (err)
                goto out2;
        return dev;
out2:
#ifdef __mc68000__
        /* XXX This assumes default cache mode to be IOMAP_FULL_CACHING,
         * XXX which may be invalid (CONFIG_060_WRITETHROUGH)
         */
        kernel_set_cachemode((void *)(dev->mem_start), 4096,
                        IOMAP_FULL_CACHING);
#endif
        free_page ((u32)(dev->mem_start));
out1:
out:
        free_netdev(dev);
        return ERR_PTR(err);
}

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

#ifdef ENABLE_BVME6000_NET
        if (MACH_IS_BVME6000) {
                if (*(char *) BVME_LOCAL_IRQ_STAT & BVME_ETHERR) {
                        i596_error(irq, dev_id);
                        return IRQ_HANDLED;
                }
        }
#endif
        if (dev == NULL) {
                printk(KERN_ERR "i596_interrupt(): irq %d for unknown device.\n", irq);
                return IRQ_NONE;
        }

        ioaddr = dev->base_addr;
        lp = dev->ml_priv;

        spin_lock (&lp->lock);

        wait_cmd(dev,lp,100,"i596 interrupt, timeout");
        status = lp->scb.status;

        DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
                        dev->name, irq, status));

        ack_cmd = status & 0xf000;

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

                handled = 1;
                if ((status & 0x8000))
                        DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt completed command.\n", dev->name));
                if ((status & 0x2000))
                        DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt command unit inactive %x.\n", dev->name, status & 0x0700));

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

                        DEB(DEB_STATUS,printk(KERN_DEBUG "cmd_head->status = %04x, ->command = %04x\n",
                                       lp->cmd_head->status, lp->cmd_head->command));
                        lp->cmd_head = ptr->v_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) {
                                        DEB(DEB_TXADDR,print_eth(skb->data, "tx-done"));
                                } else {
                                        dev->stats.tx_errors++;
                                        if ((ptr->status) & 0x0020)
                                                dev->stats.collisions++;
                                        if (!((ptr->status) & 0x0040))
                                                dev->stats.tx_heartbeat_errors++;
                                        if ((ptr->status) & 0x0400)
                                                dev->stats.tx_carrier_errors++;
                                        if ((ptr->status) & 0x0800)
                                                dev->stats.collisions++;
                                        if ((ptr->status) & 0x1000)
                                                dev->stats.tx_aborted_errors++;
                                }

                                dev_consume_skb_irq(skb);

                                tx_cmd->cmd.command = 0; /* Mark free */
                                break;
                            }
                        case CmdTDR:
                            {
                                unsigned short status = ((struct tdr_cmd *)ptr)->status;

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

                                        DEB(DEB_TDR,printk(KERN_INFO "%s: Time %d.\n", dev->name, status & 0x07ff));
                                }
                                break;
                            }
                        case CmdConfigure:
                        case CmdMulticastList:
                                /* Zap command so set_multicast_list() knows it is free */
                                ptr->command = 0;
                                break;
                        }
                        ptr->v_next = ptr->b_next = I596_NULL;
                        lp->last_cmd = jiffies;
                }

                ptr = lp->cmd_head;
                while ((ptr != I596_NULL) && (ptr != lp->cmd_tail)) {
                        ptr->command &= 0x1fff;
                        ptr = ptr->v_next;
                }

                if ((lp->cmd_head != I596_NULL))
                        ack_cmd |= CUC_START;
                lp->scb.cmd = WSWAPcmd(virt_to_bus(&lp->cmd_head->status));
        }
        if ((status & 0x1000) || (status & 0x4000)) {
                if ((status & 0x4000))
                        DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt received a frame.\n", dev->name));
                i596_rx(dev);
                /* Only RX_START if stopped - RGH 07-07-96 */
                if (status & 0x1000) {
                        if (netif_running(dev)) {
                                DEB(DEB_ERRORS,printk(KERN_ERR "%s: i596 interrupt receive unit inactive, status 0x%x\n", dev->name, status));
                                ack_cmd |= RX_START;
                                dev->stats.rx_errors++;
                                dev->stats.rx_fifo_errors++;
                                rebuild_rx_bufs(dev);
                        }
                }
        }
        wait_cmd(dev,lp,100,"i596 interrupt, timeout");
        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
        CA(dev);

        DEB(DEB_INTS,printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));

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

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

        netif_stop_queue(dev);

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

        spin_lock_irqsave(&lp->lock, flags);

        wait_cmd(dev,lp,100,"close1 timed out");
        lp->scb.command = CUC_ABORT | RX_ABORT;
        CA(dev);

        wait_cmd(dev,lp,100,"close2 timed out");

        spin_unlock_irqrestore(&lp->lock, flags);
        DEB(DEB_STRUCT,i596_display_data(dev));
        i596_cleanup_cmd(dev,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

#ifdef ENABLE_MVME16x_NET
        free_irq(0x56, dev);
#endif
        free_irq(dev->irq, dev);
        remove_rx_bufs(dev);

        return 0;
}

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

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

        DEB(DEB_MULTI,printk(KERN_DEBUG "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
                dev->name, netdev_mc_count(dev),
                dev->flags & IFF_PROMISC  ? "ON" : "OFF",
                dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));

        if (wait_cfg(dev, &lp->cf_cmd.cmd, 1000, "config change request timed out"))
                return;

        if ((dev->flags & IFF_PROMISC) && !(lp->cf_cmd.i596_config[8] & 0x01)) {
                lp->cf_cmd.i596_config[8] |= 0x01;
                config = 1;
        }
        if (!(dev->flags & IFF_PROMISC) && (lp->cf_cmd.i596_config[8] & 0x01)) {
                lp->cf_cmd.i596_config[8] &= ~0x01;
                config = 1;
        }
        if ((dev->flags & IFF_ALLMULTI) && (lp->cf_cmd.i596_config[11] & 0x20)) {
                lp->cf_cmd.i596_config[11] &= ~0x20;
                config = 1;
        }
        if (!(dev->flags & IFF_ALLMULTI) && !(lp->cf_cmd.i596_config[11] & 0x20)) {
                lp->cf_cmd.i596_config[11] |= 0x20;
                config = 1;
        }
        if (config) {
                lp->cf_cmd.cmd.command = CmdConfigure;
                i596_add_cmd(dev, &lp->cf_cmd.cmd);
        }

        cnt = netdev_mc_count(dev);
        if (cnt > MAX_MC_CNT)
        {
                cnt = MAX_MC_CNT;
                printk(KERN_ERR "%s: Only %d multicast addresses supported",
                        dev->name, cnt);
        }

        if (!netdev_mc_empty(dev)) {
                struct netdev_hw_addr *ha;
                unsigned char *cp;
                struct mc_cmd *cmd;

                if (wait_cfg(dev, &lp->mc_cmd.cmd, 1000, "multicast list change request timed out"))
                        return;
                cmd = &lp->mc_cmd;
                cmd->cmd.command = CmdMulticastList;
                cmd->mc_cnt = cnt * ETH_ALEN;
                cp = cmd->mc_addrs;
                netdev_for_each_mc_addr(ha, dev) {
                        if (!cnt--)
                                break;
                        memcpy(cp, ha->addr, ETH_ALEN);
                        if (i596_debug > 1)
                                DEB(DEB_MULTI,printk(KERN_INFO "%s: Adding address %pM\n",
                                                dev->name, cp));
                        cp += ETH_ALEN;
                }
                i596_add_cmd(dev, &cmd->cmd);
        }
}

static struct net_device *dev_82596;

static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "i82596 debug mask");

static int __init i82596_init(void)
{
        if (debug >= 0)
                i596_debug = debug;
        dev_82596 = i82596_probe();
        return PTR_ERR_OR_ZERO(dev_82596);
}
module_init(i82596_init);

static void __exit i82596_cleanup(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((void *)(dev_82596->mem_start), 4096,
                        IOMAP_FULL_CACHING);
#endif
        free_page ((u32)(dev_82596->mem_start));
        free_netdev(dev_82596);
}
module_exit(i82596_cleanup);