/* mac8390.c: New driver for 8390-based Nubus (or Nubus-alike)
   Ethernet cards on Linux */
/* Based on the former daynaport.c driver, by Alan Cox.  Some code
   taken from or inspired by skeleton.c by Donald Becker, acenic.c by
   Jes Sorensen, and ne2k-pci.c by Donald Becker and Paul Gortmaker.

   This software may be used and distributed according to the terms of
   the GNU Public License, incorporated herein by reference.  */

/* 2000-02-28: support added for Dayna and Kinetics cards by
   A.G.deWijn@phys.uu.nl */
/* 2000-04-04: support added for Dayna2 by bart@etpmod.phys.tue.nl */
/* 2001-04-18: support for DaynaPort E/LC-M by rayk@knightsmanor.org */
/* 2001-05-15: support for Cabletron ported from old daynaport driver
 * and fixed access to Sonic Sys card which masquerades as a Farallon
 * by rayk@knightsmanor.org */
/* 2002-12-30: Try to support more cards, some clues from NetBSD driver */
/* 2003-12-26: Make sure Asante cards always work. */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/nubus.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/io.h>

#include <asm/dma.h>
#include <asm/hwtest.h>
#include <asm/macints.h>

static char version[] =
        "v0.4 2001-05-15 David Huggins-Daines <dhd@debian.org> and others\n";

#define EI_SHIFT(x)     (ei_local->reg_offset[x])
#define ei_inb(port)    in_8(port)
#define ei_outb(val, port)      out_8(port, val)
#define ei_inb_p(port)  in_8(port)
#define ei_outb_p(val, port)    out_8(port, val)

#include "lib8390.c"

#define WD_START_PG                     0x00    /* First page of TX buffer */
#define CABLETRON_RX_START_PG           0x00    /* First page of RX buffer */
#define CABLETRON_RX_STOP_PG            0x30    /* Last page +1 of RX ring */
#define CABLETRON_TX_START_PG           CABLETRON_RX_STOP_PG
                                                /* First page of TX buffer */

/*
 * Unfortunately it seems we have to hardcode these for the moment
 * Shouldn't the card know about this?
 * Does anyone know where to read it off the card?
 * Do we trust the data provided by the card?
 */

#define DAYNA_8390_BASE         0x80000
#define DAYNA_8390_MEM          0x00000

#define CABLETRON_8390_BASE     0x90000
#define CABLETRON_8390_MEM      0x00000

#define INTERLAN_8390_BASE      0xE0000
#define INTERLAN_8390_MEM       0xD0000

enum mac8390_type {
        MAC8390_NONE = -1,
        MAC8390_APPLE,
        MAC8390_ASANTE,
        MAC8390_FARALLON,
        MAC8390_CABLETRON,
        MAC8390_DAYNA,
        MAC8390_INTERLAN,
        MAC8390_KINETICS,
};

static const char *cardname[] = {
        "apple",
        "asante",
        "farallon",
        "cabletron",
        "dayna",
        "interlan",
        "kinetics",
};

static const int word16[] = {
        1, /* apple */
        1, /* asante */
        1, /* farallon */
        1, /* cabletron */
        0, /* dayna */
        1, /* interlan */
        0, /* kinetics */
};

/* on which cards do we use NuBus resources? */
static const int useresources[] = {
        1, /* apple */
        1, /* asante */
        1, /* farallon */
        0, /* cabletron */
        0, /* dayna */
        0, /* interlan */
        0, /* kinetics */
};

enum mac8390_access {
        ACCESS_UNKNOWN = 0,
        ACCESS_32,
        ACCESS_16,
};

extern int mac8390_memtest(struct net_device *dev);
static int mac8390_initdev(struct net_device *dev, struct nubus_dev *ndev,
                           enum mac8390_type type);

static int mac8390_open(struct net_device *dev);
static int mac8390_close(struct net_device *dev);
static void mac8390_no_reset(struct net_device *dev);
static void interlan_reset(struct net_device *dev);

/* Sane (32-bit chunk memory read/write) - Some Farallon and Apple do this*/
static void sane_get_8390_hdr(struct net_device *dev,
                              struct e8390_pkt_hdr *hdr, int ring_page);
static void sane_block_input(struct net_device *dev, int count,
                             struct sk_buff *skb, int ring_offset);
static void sane_block_output(struct net_device *dev, int count,
                              const unsigned char *buf, const int start_page);

/* dayna_memcpy to and from card */
static void dayna_memcpy_fromcard(struct net_device *dev, void *to,
                                int from, int count);
static void dayna_memcpy_tocard(struct net_device *dev, int to,
                              const void *from, int count);

/* Dayna - Dayna/Kinetics use this */
static void dayna_get_8390_hdr(struct net_device *dev,
                               struct e8390_pkt_hdr *hdr, int ring_page);
static void dayna_block_input(struct net_device *dev, int count,
                              struct sk_buff *skb, int ring_offset);
static void dayna_block_output(struct net_device *dev, int count,
                               const unsigned char *buf, int start_page);

#define memcpy_fromio(a, b, c)  memcpy((a), (void *)(b), (c))
#define memcpy_toio(a, b, c)    memcpy((void *)(a), (b), (c))

#define memcmp_withio(a, b, c)  memcmp((a), (void *)(b), (c))

/* Slow Sane (16-bit chunk memory read/write) Cabletron uses this */
static void slow_sane_get_8390_hdr(struct net_device *dev,
                                   struct e8390_pkt_hdr *hdr, int ring_page);
static void slow_sane_block_input(struct net_device *dev, int count,
                                  struct sk_buff *skb, int ring_offset);
static void slow_sane_block_output(struct net_device *dev, int count,
                                   const unsigned char *buf, int start_page);
static void word_memcpy_tocard(unsigned long tp, const void *fp, int count);
static void word_memcpy_fromcard(void *tp, unsigned long fp, int count);
static u32 mac8390_msg_enable;

static enum mac8390_type __init mac8390_ident(struct nubus_dev *dev)
{
        switch (dev->dr_sw) {
        case NUBUS_DRSW_3COM:
                switch (dev->dr_hw) {
                case NUBUS_DRHW_APPLE_SONIC_NB:
                case NUBUS_DRHW_APPLE_SONIC_LC:
                case NUBUS_DRHW_SONNET:
                        return MAC8390_NONE;
                default:
                        return MAC8390_APPLE;
                }
                break;

        case NUBUS_DRSW_APPLE:
                switch (dev->dr_hw) {
                case NUBUS_DRHW_ASANTE_LC:
                        return MAC8390_NONE;
                case NUBUS_DRHW_CABLETRON:
                        return MAC8390_CABLETRON;
                default:
                        return MAC8390_APPLE;
                }
                break;

        case NUBUS_DRSW_ASANTE:
                return MAC8390_ASANTE;
                break;

        case NUBUS_DRSW_TECHWORKS:
        case NUBUS_DRSW_DAYNA2:
        case NUBUS_DRSW_DAYNA_LC:
                if (dev->dr_hw == NUBUS_DRHW_CABLETRON)
                        return MAC8390_CABLETRON;
                else
                        return MAC8390_APPLE;
                break;

        case NUBUS_DRSW_FARALLON:
                return MAC8390_FARALLON;
                break;

        case NUBUS_DRSW_KINETICS:
                switch (dev->dr_hw) {
                case NUBUS_DRHW_INTERLAN:
                        return MAC8390_INTERLAN;
                default:
                        return MAC8390_KINETICS;
                }
                break;

        case NUBUS_DRSW_DAYNA:
                /*
                 * These correspond to Dayna Sonic cards
                 * which use the macsonic driver
                 */
                if (dev->dr_hw == NUBUS_DRHW_SMC9194 ||
                    dev->dr_hw == NUBUS_DRHW_INTERLAN)
                        return MAC8390_NONE;
                else
                        return MAC8390_DAYNA;
                break;
        }
        return MAC8390_NONE;
}

static enum mac8390_access __init mac8390_testio(volatile unsigned long membase)
{
        unsigned long outdata = 0xA5A0B5B0;
        unsigned long indata =  0x00000000;
        /* Try writing 32 bits */
        memcpy_toio(membase, &outdata, 4);
        /* Now compare them */
        if (memcmp_withio(&outdata, membase, 4) == 0)
                return ACCESS_32;
        /* Write 16 bit output */
        word_memcpy_tocard(membase, &outdata, 4);
        /* Now read it back */
        word_memcpy_fromcard(&indata, membase, 4);
        if (outdata == indata)
                return ACCESS_16;
        return ACCESS_UNKNOWN;
}

static int __init mac8390_memsize(unsigned long membase)
{
        unsigned long flags;
        int i, j;

        local_irq_save(flags);
        /* Check up to 32K in 4K increments */
        for (i = 0; i < 8; i++) {
                volatile unsigned short *m = (unsigned short *)(membase + (i * 0x1000));

                /* Unwriteable - we have a fully decoded card and the
                   RAM end located */
                if (hwreg_present(m) == 0)
                        break;

                /* write a distinctive byte */
                *m = 0xA5A0 | i;
                /* check that we read back what we wrote */
                if (*m != (0xA5A0 | i))
                        break;

                /* check for partial decode and wrap */
                for (j = 0; j < i; j++) {
                        volatile unsigned short *p = (unsigned short *)(membase + (j * 0x1000));
                        if (*p != (0xA5A0 | j))
                                break;
                }
        }
        local_irq_restore(flags);
        /*
         * in any case, we stopped once we tried one block too many,
         * or once we reached 32K
         */
        return i * 0x1000;
}

static bool __init mac8390_init(struct net_device *dev, struct nubus_dev *ndev,
                                enum mac8390_type cardtype)
{
        struct nubus_dir dir;
        struct nubus_dirent ent;
        int offset;
        volatile unsigned short *i;

        printk_once(KERN_INFO pr_fmt("%s"), version);

        dev->irq = SLOT2IRQ(ndev->board->slot);
        /* This is getting to be a habit */
        dev->base_addr = (ndev->board->slot_addr |
                          ((ndev->board->slot & 0xf) << 20));

        /*
         * Get some Nubus info - we will trust the card's idea
         * of where its memory and registers are.
         */

        if (nubus_get_func_dir(ndev, &dir) == -1) {
                pr_err("%s: Unable to get Nubus functional directory for slot %X!\n",
                       dev->name, ndev->board->slot);
                return false;
        }

        /* Get the MAC address */
        if (nubus_find_rsrc(&dir, NUBUS_RESID_MAC_ADDRESS, &ent) == -1) {
                pr_info("%s: Couldn't get MAC address!\n", dev->name);
                return false;
        }

        nubus_get_rsrc_mem(dev->dev_addr, &ent, 6);

        if (useresources[cardtype] == 1) {
                nubus_rewinddir(&dir);
                if (nubus_find_rsrc(&dir, NUBUS_RESID_MINOR_BASEOS,
                                    &ent) == -1) {
                        pr_err("%s: Memory offset resource for slot %X not found!\n",
                               dev->name, ndev->board->slot);
                        return false;
                }
                nubus_get_rsrc_mem(&offset, &ent, 4);
                dev->mem_start = dev->base_addr + offset;
                /* yes, this is how the Apple driver does it */
                dev->base_addr = dev->mem_start + 0x10000;
                nubus_rewinddir(&dir);
                if (nubus_find_rsrc(&dir, NUBUS_RESID_MINOR_LENGTH,
                                    &ent) == -1) {
                        pr_info("%s: Memory length resource for slot %X not found, probing\n",
                                dev->name, ndev->board->slot);
                        offset = mac8390_memsize(dev->mem_start);
                } else {
                        nubus_get_rsrc_mem(&offset, &ent, 4);
                }
                dev->mem_end = dev->mem_start + offset;
        } else {
                switch (cardtype) {
                case MAC8390_KINETICS:
                case MAC8390_DAYNA: /* it's the same */
                        dev->base_addr = (int)(ndev->board->slot_addr +
                                               DAYNA_8390_BASE);
                        dev->mem_start = (int)(ndev->board->slot_addr +
                                               DAYNA_8390_MEM);
                        dev->mem_end = dev->mem_start +
                                       mac8390_memsize(dev->mem_start);
                        break;
                case MAC8390_INTERLAN:
                        dev->base_addr = (int)(ndev->board->slot_addr +
                                               INTERLAN_8390_BASE);
                        dev->mem_start = (int)(ndev->board->slot_addr +
                                               INTERLAN_8390_MEM);
                        dev->mem_end = dev->mem_start +
                                       mac8390_memsize(dev->mem_start);
                        break;
                case MAC8390_CABLETRON:
                        dev->base_addr = (int)(ndev->board->slot_addr +
                                               CABLETRON_8390_BASE);
                        dev->mem_start = (int)(ndev->board->slot_addr +
                                               CABLETRON_8390_MEM);
                        /* The base address is unreadable if 0x00
                         * has been written to the command register
                         * Reset the chip by writing E8390_NODMA +
                         *   E8390_PAGE0 + E8390_STOP just to be
                         *   sure
                         */
                        i = (void *)dev->base_addr;
                        *i = 0x21;
                        dev->mem_end = dev->mem_start +
                                       mac8390_memsize(dev->mem_start);
                        break;

                default:
                        pr_err("Card type %s is unsupported, sorry\n",
                               ndev->board->name);
                        return false;
                }
        }

        return true;
}

struct net_device * __init mac8390_probe(int unit)
{
        struct net_device *dev;
        struct nubus_dev *ndev = NULL;
        int err = -ENODEV;
        struct ei_device *ei_local;

        static unsigned int slots;

        enum mac8390_type cardtype;

        /* probably should check for Nubus instead */

        if (!MACH_IS_MAC)
                return ERR_PTR(-ENODEV);

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

        if (unit >= 0)
                sprintf(dev->name, "eth%d", unit);

        while ((ndev = nubus_find_type(NUBUS_CAT_NETWORK, NUBUS_TYPE_ETHERNET,
                                       ndev))) {
                /* Have we seen it already? */
                if (slots & (1 << ndev->board->slot))
                        continue;
                slots |= 1 << ndev->board->slot;

                cardtype = mac8390_ident(ndev);
                if (cardtype == MAC8390_NONE)
                        continue;

                if (!mac8390_init(dev, ndev, cardtype))
                        continue;

                /* Do the nasty 8390 stuff */
                if (!mac8390_initdev(dev, ndev, cardtype))
                        break;
        }

        if (!ndev)
                goto out;

         ei_local = netdev_priv(dev);
         ei_local->msg_enable = mac8390_msg_enable;

        err = register_netdev(dev);
        if (err)
                goto out;
        return dev;

out:
        free_netdev(dev);
        return ERR_PTR(err);
}

#ifdef MODULE
MODULE_AUTHOR("David Huggins-Daines <dhd@debian.org> and others");
MODULE_DESCRIPTION("Macintosh NS8390-based Nubus Ethernet driver");
MODULE_LICENSE("GPL");

static struct net_device *dev_mac8390;

int __init init_module(void)
{
        dev_mac8390 = mac8390_probe(-1);
        if (IS_ERR(dev_mac8390)) {
                pr_warn("mac8390: No card found\n");
                return PTR_ERR(dev_mac8390);
        }
        return 0;
}

void __exit cleanup_module(void)
{
        unregister_netdev(dev_mac8390);
        free_netdev(dev_mac8390);
}

#endif /* MODULE */

static const struct net_device_ops mac8390_netdev_ops = {
        .ndo_open               = mac8390_open,
        .ndo_stop               = mac8390_close,
        .ndo_start_xmit         = __ei_start_xmit,
        .ndo_tx_timeout         = __ei_tx_timeout,
        .ndo_get_stats          = __ei_get_stats,
        .ndo_set_rx_mode        = __ei_set_multicast_list,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = __ei_poll,
#endif
};

static int __init mac8390_initdev(struct net_device *dev,
                                  struct nubus_dev *ndev,
                                  enum mac8390_type type)
{
        static u32 fwrd4_offsets[16] = {
                0,      4,      8,      12,
                16,     20,     24,     28,
                32,     36,     40,     44,
                48,     52,     56,     60
        };
        static u32 back4_offsets[16] = {
                60,     56,     52,     48,
                44,     40,     36,     32,
                28,     24,     20,     16,
                12,     8,      4,      0
        };
        static u32 fwrd2_offsets[16] = {
                0,      2,      4,      6,
                8,     10,     12,     14,
                16,    18,     20,     22,
                24,    26,     28,     30
        };

        int access_bitmode = 0;

        /* Now fill in our stuff */
        dev->netdev_ops = &mac8390_netdev_ops;

        /* GAR, ei_status is actually a macro even though it looks global */
        ei_status.name = cardname[type];
        ei_status.word16 = word16[type];

        /* Cabletron's TX/RX buffers are backwards */
        if (type == MAC8390_CABLETRON) {
                ei_status.tx_start_page = CABLETRON_TX_START_PG;
                ei_status.rx_start_page = CABLETRON_RX_START_PG;
                ei_status.stop_page = CABLETRON_RX_STOP_PG;
                ei_status.rmem_start = dev->mem_start;
                ei_status.rmem_end = dev->mem_start + CABLETRON_RX_STOP_PG*256;
        } else {
                ei_status.tx_start_page = WD_START_PG;
                ei_status.rx_start_page = WD_START_PG + TX_PAGES;
                ei_status.stop_page = (dev->mem_end - dev->mem_start)/256;
                ei_status.rmem_start = dev->mem_start + TX_PAGES*256;
                ei_status.rmem_end = dev->mem_end;
        }

        /* Fill in model-specific information and functions */
        switch (type) {
        case MAC8390_FARALLON:
        case MAC8390_APPLE:
                switch (mac8390_testio(dev->mem_start)) {
                case ACCESS_UNKNOWN:
                        pr_err("Don't know how to access card memory!\n");
                        return -ENODEV;

                case ACCESS_16:
                        /* 16 bit card, register map is reversed */
                        ei_status.reset_8390 = mac8390_no_reset;
                        ei_status.block_input = slow_sane_block_input;
                        ei_status.block_output = slow_sane_block_output;
                        ei_status.get_8390_hdr = slow_sane_get_8390_hdr;
                        ei_status.reg_offset = back4_offsets;
                        break;

                case ACCESS_32:
                        /* 32 bit card, register map is reversed */
                        ei_status.reset_8390 = mac8390_no_reset;
                        ei_status.block_input = sane_block_input;
                        ei_status.block_output = sane_block_output;
                        ei_status.get_8390_hdr = sane_get_8390_hdr;
                        ei_status.reg_offset = back4_offsets;
                        access_bitmode = 1;
                        break;
                }
                break;

        case MAC8390_ASANTE:
                /* Some Asante cards pass the 32 bit test
                 * but overwrite system memory when run at 32 bit.
                 * so we run them all at 16 bit.
                 */
                ei_status.reset_8390 = mac8390_no_reset;
                ei_status.block_input = slow_sane_block_input;
                ei_status.block_output = slow_sane_block_output;
                ei_status.get_8390_hdr = slow_sane_get_8390_hdr;
                ei_status.reg_offset = back4_offsets;
                break;

        case MAC8390_CABLETRON:
                /* 16 bit card, register map is short forward */
                ei_status.reset_8390 = mac8390_no_reset;
                ei_status.block_input = slow_sane_block_input;
                ei_status.block_output = slow_sane_block_output;
                ei_status.get_8390_hdr = slow_sane_get_8390_hdr;
                ei_status.reg_offset = fwrd2_offsets;
                break;

        case MAC8390_DAYNA:
        case MAC8390_KINETICS:
                /* 16 bit memory, register map is forward */
                /* dayna and similar */
                ei_status.reset_8390 = mac8390_no_reset;
                ei_status.block_input = dayna_block_input;
                ei_status.block_output = dayna_block_output;
                ei_status.get_8390_hdr = dayna_get_8390_hdr;
                ei_status.reg_offset = fwrd4_offsets;
                break;

        case MAC8390_INTERLAN:
                /* 16 bit memory, register map is forward */
                ei_status.reset_8390 = interlan_reset;
                ei_status.block_input = slow_sane_block_input;
                ei_status.block_output = slow_sane_block_output;
                ei_status.get_8390_hdr = slow_sane_get_8390_hdr;
                ei_status.reg_offset = fwrd4_offsets;
                break;

        default:
                pr_err("Card type %s is unsupported, sorry\n",
                       ndev->board->name);
                return -ENODEV;
        }

        __NS8390_init(dev, 0);

        /* Good, done, now spit out some messages */
        pr_info("%s: %s in slot %X (type %s)\n",
                dev->name, ndev->board->name, ndev->board->slot,
                cardname[type]);
        pr_info("MAC %pM IRQ %d, %d KB shared memory at %#lx, %d-bit access.\n",
                dev->dev_addr, dev->irq,
                (unsigned int)(dev->mem_end - dev->mem_start) >> 10,
                dev->mem_start, access_bitmode ? 32 : 16);
        return 0;
}

static int mac8390_open(struct net_device *dev)
{
        int err;

        __ei_open(dev);
        err = request_irq(dev->irq, __ei_interrupt, 0, "8390 Ethernet", dev);
        if (err)
                pr_err("%s: unable to get IRQ %d\n", dev->name, dev->irq);
        return err;
}

static int mac8390_close(struct net_device *dev)
{
        free_irq(dev->irq, dev);
        __ei_close(dev);
        return 0;
}

static void mac8390_no_reset(struct net_device *dev)
{
        struct ei_device *ei_local = netdev_priv(dev);

        ei_status.txing = 0;
        netif_info(ei_local, hw, dev, "reset not supported\n");
}

static void interlan_reset(struct net_device *dev)
{
        unsigned char *target = nubus_slot_addr(IRQ2SLOT(dev->irq));
        struct ei_device *ei_local = netdev_priv(dev);

        netif_info(ei_local, hw, dev, "Need to reset the NS8390 t=%lu...",
                   jiffies);
        ei_status.txing = 0;
        target[0xC0000] = 0;
        if (netif_msg_hw(ei_local))
                pr_cont("reset complete\n");
}

/* dayna_memcpy_fromio/dayna_memcpy_toio */
/* directly from daynaport.c by Alan Cox */
static void dayna_memcpy_fromcard(struct net_device *dev, void *to, int from,
                                  int count)
{
        volatile unsigned char *ptr;
        unsigned char *target = to;
        from <<= 1;     /* word, skip overhead */
        ptr = (unsigned char *)(dev->mem_start+from);
        /* Leading byte? */
        if (from & 2) {
                *target++ = ptr[-1];
                ptr += 2;
                count--;
        }
        while (count >= 2) {
                *(unsigned short *)target = *(unsigned short volatile *)ptr;
                ptr += 4;                       /* skip cruft */
                target += 2;
                count -= 2;
        }
        /* Trailing byte? */
        if (count)
                *target = *ptr;
}

static void dayna_memcpy_tocard(struct net_device *dev, int to,
                                const void *from, int count)
{
        volatile unsigned short *ptr;
        const unsigned char *src = from;
        to <<= 1;       /* word, skip overhead */
        ptr = (unsigned short *)(dev->mem_start+to);
        /* Leading byte? */
        if (to & 2) {           /* avoid a byte write (stomps on other data) */
                ptr[-1] = (ptr[-1]&0xFF00)|*src++;
                ptr++;
                count--;
        }
        while (count >= 2) {
                *ptr++ = *(unsigned short *)src;        /* Copy and */
                ptr++;                  /* skip cruft */
                src += 2;
                count -= 2;
        }
        /* Trailing byte? */
        if (count) {
                /* card doesn't like byte writes */
                *ptr = (*ptr & 0x00FF) | (*src << 8);
        }
}

/* sane block input/output */
static void sane_get_8390_hdr(struct net_device *dev,
                              struct e8390_pkt_hdr *hdr, int ring_page)
{
        unsigned long hdr_start = (ring_page - WD_START_PG)<<8;
        memcpy_fromio(hdr, dev->mem_start + hdr_start, 4);
        /* Fix endianness */
        hdr->count = swab16(hdr->count);
}

static void sane_block_input(struct net_device *dev, int count,
                             struct sk_buff *skb, int ring_offset)
{
        unsigned long xfer_base = ring_offset - (WD_START_PG<<8);
        unsigned long xfer_start = xfer_base + dev->mem_start;

        if (xfer_start + count > ei_status.rmem_end) {
                /* We must wrap the input move. */
                int semi_count = ei_status.rmem_end - xfer_start;
                memcpy_fromio(skb->data, dev->mem_start + xfer_base,
                              semi_count);
                count -= semi_count;
                memcpy_fromio(skb->data + semi_count, ei_status.rmem_start,
                              count);
        } else {
                memcpy_fromio(skb->data, dev->mem_start + xfer_base, count);
        }
}

static void sane_block_output(struct net_device *dev, int count,
                              const unsigned char *buf, int start_page)
{
        long shmem = (start_page - WD_START_PG)<<8;

        memcpy_toio(dev->mem_start + shmem, buf, count);
}

/* dayna block input/output */
static void dayna_get_8390_hdr(struct net_device *dev,
                               struct e8390_pkt_hdr *hdr, int ring_page)
{
        unsigned long hdr_start = (ring_page - WD_START_PG)<<8;

        dayna_memcpy_fromcard(dev, hdr, hdr_start, 4);
        /* Fix endianness */
        hdr->count = (hdr->count & 0xFF) << 8 | (hdr->count >> 8);
}

static void dayna_block_input(struct net_device *dev, int count,
                              struct sk_buff *skb, int ring_offset)
{
        unsigned long xfer_base = ring_offset - (WD_START_PG<<8);
        unsigned long xfer_start = xfer_base+dev->mem_start;

        /* Note the offset math is done in card memory space which is word
           per long onto our space. */

        if (xfer_start + count > ei_status.rmem_end) {
                /* We must wrap the input move. */
                int semi_count = ei_status.rmem_end - xfer_start;
                dayna_memcpy_fromcard(dev, skb->data, xfer_base, semi_count);
                count -= semi_count;
                dayna_memcpy_fromcard(dev, skb->data + semi_count,
                                      ei_status.rmem_start - dev->mem_start,
                                      count);
        } else {
                dayna_memcpy_fromcard(dev, skb->data, xfer_base, count);
        }
}

static void dayna_block_output(struct net_device *dev, int count,
                               const unsigned char *buf,
                               int start_page)
{
        long shmem = (start_page - WD_START_PG)<<8;

        dayna_memcpy_tocard(dev, shmem, buf, count);
}

/* Cabletron block I/O */
static void slow_sane_get_8390_hdr(struct net_device *dev,
                                   struct e8390_pkt_hdr *hdr,
                                   int ring_page)
{
        unsigned long hdr_start = (ring_page - WD_START_PG)<<8;
        word_memcpy_fromcard(hdr, dev->mem_start + hdr_start, 4);
        /* Register endianism - fix here rather than 8390.c */
        hdr->count = (hdr->count&0xFF)<<8|(hdr->count>>8);
}

static void slow_sane_block_input(struct net_device *dev, int count,
                                  struct sk_buff *skb, int ring_offset)
{
        unsigned long xfer_base = ring_offset - (WD_START_PG<<8);
        unsigned long xfer_start = xfer_base+dev->mem_start;

        if (xfer_start + count > ei_status.rmem_end) {
                /* We must wrap the input move. */
                int semi_count = ei_status.rmem_end - xfer_start;
                word_memcpy_fromcard(skb->data, dev->mem_start + xfer_base,
                                     semi_count);
                count -= semi_count;
                word_memcpy_fromcard(skb->data + semi_count,
                                     ei_status.rmem_start, count);
        } else {
                word_memcpy_fromcard(skb->data, dev->mem_start + xfer_base,
                                     count);
        }
}

static void slow_sane_block_output(struct net_device *dev, int count,
                                   const unsigned char *buf, int start_page)
{
        long shmem = (start_page - WD_START_PG)<<8;

        word_memcpy_tocard(dev->mem_start + shmem, buf, count);
}

static void word_memcpy_tocard(unsigned long tp, const void *fp, int count)
{
        volatile unsigned short *to = (void *)tp;
        const unsigned short *from = fp;

        count++;
        count /= 2;

        while (count--)
                *to++ = *from++;
}

static void word_memcpy_fromcard(void *tp, unsigned long fp, int count)
{
        unsigned short *to = tp;
        const volatile unsigned short *from = (const void *)fp;

        count++;
        count /= 2;

        while (count--)
                *to++ = *from++;
}