hp100.c

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/*
** hp100.c
** HP CASCADE Architecture Driver for 100VG-AnyLan Network Adapters
**
** $Id: hp100.c,v 1.58 2001/09/24 18:03:01 perex Exp perex $
**
** Based on the HP100 driver written by Jaroslav Kysela <[email protected]>
** Extended for new busmaster capable chipsets by
** Siegfried "Frieder" Loeffler (dg1sek) <[email protected]>
**
** Maintained by: Jaroslav Kysela <[email protected]>
**
** This driver has only been tested with
** -- HP J2585B 10/100 Mbit/s PCI Busmaster
** -- HP J2585A 10/100 Mbit/s PCI
** -- HP J2970A 10 Mbit/s PCI Combo 10base-T/BNC
** -- HP J2973A 10 Mbit/s PCI 10base-T
** -- HP J2573  10/100 ISA
** -- Compex ReadyLink ENET100-VG4  10/100 Mbit/s PCI / EISA
** -- Compex FreedomLine 100/VG  10/100 Mbit/s ISA / EISA / PCI
**
** but it should also work with the other CASCADE based adapters.
**
** TODO:
**       -  J2573 seems to hang sometimes when in shared memory mode.
**       -  Mode for Priority TX
**       -  Check PCI registers, performance might be improved?
**       -  To reduce interrupt load in busmaster, one could switch off
**          the interrupts that are used to refill the queues whenever the
**          queues are filled up to more than a certain threshold.
**       -  some updates for EISA version of card
**
**
**   This code is free software; you can redistribute it and/or modify
**   it under the terms of the GNU General Public License as published by
**   the Free Software Foundation; either version 2 of the License, or
**   (at your option) any later version.
**
**   This code is distributed in the hope that it will be useful,
**   but WITHOUT ANY WARRANTY; without even the implied warranty of
**   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**   GNU General Public License for more details.
**
**   You should have received a copy of the GNU General Public License
**   along with this program; if not, write to the Free Software
**   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** 1.57c -> 1.58
**   - used indent to change coding-style
**   - added KTI DP-200 EISA ID
**   - ioremap is also used for low (<1MB) memory (multi-architecture support)
**
** 1.57b -> 1.57c - Arnaldo Carvalho de Melo <[email protected]>
**   - release resources on failure in init_module
**
** 1.57 -> 1.57b - Jean II
**   - fix spinlocks, SMP is now working !
**
** 1.56 -> 1.57
**   - updates for new PCI interface for 2.1 kernels
**
** 1.55 -> 1.56
**   - removed printk in misc. interrupt and update statistics to allow
**     monitoring of card status
**   - timing changes in xmit routines, relogin to 100VG hub added when
**     driver does reset
**   - included fix for Compex FreedomLine PCI adapter
**
** 1.54 -> 1.55
**   - fixed bad initialization in init_module
**   - added Compex FreedomLine adapter
**   - some fixes in card initialization
**
** 1.53 -> 1.54
**   - added hardware multicast filter support (doesn't work)
**   - little changes in hp100_sense_lan routine
**     - added support for Coax and AUI (J2970)
**   - fix for multiple cards and hp100_mode parameter (insmod)
**   - fix for shared IRQ
**
** 1.52 -> 1.53
**   - fixed bug in multicast support
**
*/

#define HP100_DEFAULT_PRIORITY_TX 0

#undef HP100_DEBUG
#undef HP100_DEBUG_B        /* Trace  */
#undef HP100_DEBUG_BM       /* Debug busmaster code (PDL stuff) */

#undef HP100_DEBUG_TRAINING /* Debug login-to-hub procedure */
#undef HP100_DEBUG_TX
#undef HP100_DEBUG_IRQ
#undef HP100_DEBUG_RX

#undef HP100_MULTICAST_FILTER   /* Need to be debugged... */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/eisa.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/jiffies.h>

#include <asm/io.h>

#include "hp100.h"

/*
 *  defines
 */

#define HP100_BUS_ISA     0
#define HP100_BUS_EISA    1
#define HP100_BUS_PCI     2

#define HP100_REGION_SIZE   0x20    /* for ioports */
#define HP100_SIG_LEN       8   /* same as EISA_SIG_LEN */

#define HP100_MAX_PACKET_SIZE   (1536+4)
#define HP100_MIN_PACKET_SIZE   60

#ifndef HP100_DEFAULT_RX_RATIO
/* default - 75% onboard memory on the card are used for RX packets */
#define HP100_DEFAULT_RX_RATIO  75
#endif

#ifndef HP100_DEFAULT_PRIORITY_TX
/* default - don't enable transmit outgoing packets as priority */
#define HP100_DEFAULT_PRIORITY_TX 0
#endif

/*
 *  structures
 */

struct hp100_private {
    spinlock_t lock;
    char id[HP100_SIG_LEN];
    u_short chip;
    u_short soft_model;
    u_int memory_size;
    u_int virt_memory_size;
    u_short rx_ratio;   /* 1 - 99 */
    u_short priority_tx;    /* != 0 - priority tx */
    u_short mode;       /* PIO, Shared Mem or Busmaster */
    u_char bus;
    struct pci_dev *pci_dev;
    short mem_mapped;   /* memory mapped access */
    void __iomem *mem_ptr_virt; /* virtual memory mapped area, maybe NULL */
    unsigned long mem_ptr_phys; /* physical memory mapped area */
    short lan_type;     /* 10Mb/s, 100Mb/s or -1 (error) */
    int hub_status;     /* was login to hub successful? */
    u_char mac1_mode;
    u_char mac2_mode;
    u_char hash_bytes[8];

    /* Rings for busmaster mode: */
    hp100_ring_t *rxrhead;  /* Head (oldest) index into rxring */
    hp100_ring_t *rxrtail;  /* Tail (newest) index into rxring */
    hp100_ring_t *txrhead;  /* Head (oldest) index into txring */
    hp100_ring_t *txrtail;  /* Tail (newest) index into txring */

    hp100_ring_t rxring[MAX_RX_PDL];
    hp100_ring_t txring[MAX_TX_PDL];

    u_int *page_vaddr_algn; /* Aligned virtual address of allocated page */
    u_long whatever_offset; /* Offset to bus/phys/dma address */
    int rxrcommit;      /* # Rx PDLs committed to adapter */
    int txrcommit;      /* # Tx PDLs committed to adapter */
};

/*
 *  variables
 */
#ifdef CONFIG_ISA
static const char *hp100_isa_tbl[] = {
    "HWPF150", /* HP J2573 rev A */
    "HWP1950", /* HP J2573 */
};
#endif

#ifdef CONFIG_EISA
static struct eisa_device_id hp100_eisa_tbl[] = {
    { "HWPF180" }, /* HP J2577 rev A */
    { "HWP1920" }, /* HP 27248B */
    { "HWP1940" }, /* HP J2577 */
    { "HWP1990" }, /* HP J2577 */
    { "CPX0301" }, /* ReadyLink ENET100-VG4 */
    { "CPX0401" }, /* FreedomLine 100/VG */
    { "" }         /* Mandatory final entry ! */
};
MODULE_DEVICE_TABLE(eisa, hp100_eisa_tbl);
#endif

#ifdef CONFIG_PCI
static DEFINE_PCI_DEVICE_TABLE(hp100_pci_tbl) = {
    {PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_J2585A, PCI_ANY_ID, PCI_ANY_ID,},
    {PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_J2585B, PCI_ANY_ID, PCI_ANY_ID,},
    {PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_J2970A, PCI_ANY_ID, PCI_ANY_ID,},
    {PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_J2973A, PCI_ANY_ID, PCI_ANY_ID,},
    {PCI_VENDOR_ID_COMPEX, PCI_DEVICE_ID_COMPEX_ENET100VG4, PCI_ANY_ID, PCI_ANY_ID,},
    {PCI_VENDOR_ID_COMPEX2, PCI_DEVICE_ID_COMPEX2_100VG, PCI_ANY_ID, PCI_ANY_ID,},
/*  {PCI_VENDOR_ID_KTI, PCI_DEVICE_ID_KTI_DP200, PCI_ANY_ID, PCI_ANY_ID }, */
    {}          /* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, hp100_pci_tbl);
#endif

static int hp100_rx_ratio = HP100_DEFAULT_RX_RATIO;
static int hp100_priority_tx = HP100_DEFAULT_PRIORITY_TX;
static int hp100_mode = 1;

module_param(hp100_rx_ratio, int, 0);
module_param(hp100_priority_tx, int, 0);
module_param(hp100_mode, int, 0);

/*
 *  prototypes
 */

static int hp100_probe1(struct net_device *dev, int ioaddr, u_char bus,
            struct pci_dev *pci_dev);


static int hp100_open(struct net_device *dev);
static int hp100_close(struct net_device *dev);
static netdev_tx_t hp100_start_xmit(struct sk_buff *skb,
                    struct net_device *dev);
static netdev_tx_t hp100_start_xmit_bm(struct sk_buff *skb,
                       struct net_device *dev);
static void hp100_rx(struct net_device *dev);
static struct net_device_stats *hp100_get_stats(struct net_device *dev);
static void hp100_misc_interrupt(struct net_device *dev);
static void hp100_update_stats(struct net_device *dev);
static void hp100_clear_stats(struct hp100_private *lp, int ioaddr);
static void hp100_set_multicast_list(struct net_device *dev);
static irqreturn_t hp100_interrupt(int irq, void *dev_id);
static void hp100_start_interface(struct net_device *dev);
static void hp100_stop_interface(struct net_device *dev);
static void hp100_load_eeprom(struct net_device *dev, u_short ioaddr);
static int hp100_sense_lan(struct net_device *dev);
static int hp100_login_to_vg_hub(struct net_device *dev,
                 u_short force_relogin);
static int hp100_down_vg_link(struct net_device *dev);
static void hp100_cascade_reset(struct net_device *dev, u_short enable);
static void hp100_BM_shutdown(struct net_device *dev);
static void hp100_mmuinit(struct net_device *dev);
static void hp100_init_pdls(struct net_device *dev);
static int hp100_init_rxpdl(struct net_device *dev,
                register hp100_ring_t * ringptr,
                register u_int * pdlptr);
static int hp100_init_txpdl(struct net_device *dev,
                register hp100_ring_t * ringptr,
                register u_int * pdlptr);
static void hp100_rxfill(struct net_device *dev);
static void hp100_hwinit(struct net_device *dev);
static void hp100_clean_txring(struct net_device *dev);
#ifdef HP100_DEBUG
static void hp100_RegisterDump(struct net_device *dev);
#endif

/* Conversion to new PCI API :
 * Convert an address in a kernel buffer to a bus/phys/dma address.
 * This work *only* for memory fragments part of lp->page_vaddr,
 * because it was properly DMA allocated via pci_alloc_consistent(),
 * so we just need to "retrieve" the original mapping to bus/phys/dma
 * address - Jean II */
static inline dma_addr_t virt_to_whatever(struct net_device *dev, u32 * ptr)
{
    struct hp100_private *lp = netdev_priv(dev);
    return ((u_long) ptr) + lp->whatever_offset;
}

static inline u_int pdl_map_data(struct hp100_private *lp, void *data)
{
    return pci_map_single(lp->pci_dev, data,
                  MAX_ETHER_SIZE, PCI_DMA_FROMDEVICE);
}

/* TODO: This function should not really be needed in a good design... */
static void wait(void)
{
    mdelay(1);
}

/*
 *  probe functions
 *  These functions should - if possible - avoid doing write operations
 *  since this could cause problems when the card is not installed.
 */

/*
 * Read board id and convert to string.
 * Effectively same code as decode_eisa_sig
 */
static __devinit const char *hp100_read_id(int ioaddr)
{
    int i;
    static char str[HP100_SIG_LEN];
    unsigned char sig[4], sum;
        unsigned short rev;

    hp100_page(ID_MAC_ADDR);
    sum = 0;
    for (i = 0; i < 4; i++) {
        sig[i] = hp100_inb(BOARD_ID + i);
        sum += sig[i];
    }

    sum += hp100_inb(BOARD_ID + i);
    if (sum != 0xff)
        return NULL;    /* bad checksum */

        str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
        str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
        str[2] = (sig[1] & 0x1f) + ('A' - 1);
        rev = (sig[2] << 8) | sig[3];
        sprintf(str + 3, "%04X", rev);

    return str;
}

#ifdef CONFIG_ISA
static __init int hp100_isa_probe1(struct net_device *dev, int ioaddr)
{
    const char *sig;
    int i;

    if (!request_region(ioaddr, HP100_REGION_SIZE, "hp100"))
        goto err;

    if (hp100_inw(HW_ID) != HP100_HW_ID_CASCADE) {
        release_region(ioaddr, HP100_REGION_SIZE);
        goto err;
    }

    sig = hp100_read_id(ioaddr);
    release_region(ioaddr, HP100_REGION_SIZE);

    if (sig == NULL)
        goto err;

    for (i = 0; i < ARRAY_SIZE(hp100_isa_tbl); i++) {
        if (!strcmp(hp100_isa_tbl[i], sig))
            break;

    }

    if (i < ARRAY_SIZE(hp100_isa_tbl))
        return hp100_probe1(dev, ioaddr, HP100_BUS_ISA, NULL);
 err:
    return -ENODEV;

}
/*
 * Probe for ISA board.
 * EISA and PCI are handled by device infrastructure.
 */

static int  __init hp100_isa_probe(struct net_device *dev, int addr)
{
    int err = -ENODEV;

    /* Probe for a specific ISA address */
    if (addr > 0xff && addr < 0x400)
        err = hp100_isa_probe1(dev, addr);

    else if (addr != 0)
        err = -ENXIO;

    else {
        /* Probe all ISA possible port regions */
        for (addr = 0x100; addr < 0x400; addr += 0x20) {
            err = hp100_isa_probe1(dev, addr);
            if (!err)
                break;
        }
    }
    return err;
}
#endif /* CONFIG_ISA */

#if !defined(MODULE) && defined(CONFIG_ISA)
struct net_device * __init hp100_probe(int unit)
{
    struct net_device *dev = alloc_etherdev(sizeof(struct hp100_private));
    int err;

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

#ifdef HP100_DEBUG_B
    hp100_outw(0x4200, TRACE);
    printk("hp100: %s: probe\n", dev->name);
#endif

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

    err = hp100_isa_probe(dev, dev->base_addr);
    if (err)
        goto out;

    return dev;
 out:
    free_netdev(dev);
    return ERR_PTR(err);
}
#endif /* !MODULE && CONFIG_ISA */

static const struct net_device_ops hp100_bm_netdev_ops = {
    .ndo_open       = hp100_open,
    .ndo_stop       = hp100_close,
    .ndo_start_xmit     = hp100_start_xmit_bm,
    .ndo_get_stats      = hp100_get_stats,
    .ndo_set_rx_mode    = hp100_set_multicast_list,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_validate_addr  = eth_validate_addr,
};

static const struct net_device_ops hp100_netdev_ops = {
    .ndo_open       = hp100_open,
    .ndo_stop       = hp100_close,
    .ndo_start_xmit     = hp100_start_xmit,
    .ndo_get_stats      = hp100_get_stats,
    .ndo_set_rx_mode    = hp100_set_multicast_list,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_validate_addr  = eth_validate_addr,
};

static int __devinit hp100_probe1(struct net_device *dev, int ioaddr,
                  u_char bus, struct pci_dev *pci_dev)
{
    int i;
    int err = -ENODEV;
    const char *eid;
    u_int chip;
    u_char uc;
    u_int memory_size = 0, virt_memory_size = 0;
    u_short local_mode, lsw;
    short mem_mapped;
    unsigned long mem_ptr_phys;
    void __iomem *mem_ptr_virt;
    struct hp100_private *lp;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4201, TRACE);
    printk("hp100: %s: probe1\n", dev->name);
#endif

    /* memory region for programmed i/o */
    if (!request_region(ioaddr, HP100_REGION_SIZE, "hp100"))
        goto out1;

    if (hp100_inw(HW_ID) != HP100_HW_ID_CASCADE)
        goto out2;

    chip = hp100_inw(PAGING) & HP100_CHIPID_MASK;
#ifdef HP100_DEBUG
    if (chip == HP100_CHIPID_SHASTA)
        printk("hp100: %s: Shasta Chip detected. (This is a pre 802.12 chip)\n", dev->name);
    else if (chip == HP100_CHIPID_RAINIER)
        printk("hp100: %s: Rainier Chip detected. (This is a pre 802.12 chip)\n", dev->name);
    else if (chip == HP100_CHIPID_LASSEN)
        printk("hp100: %s: Lassen Chip detected.\n", dev->name);
    else
        printk("hp100: %s: Warning: Unknown CASCADE chip (id=0x%.4x).\n", dev->name, chip);
#endif

    dev->base_addr = ioaddr;

    eid = hp100_read_id(ioaddr);
    if (eid == NULL) {  /* bad checksum? */
        printk(KERN_WARNING "hp100_probe: bad ID checksum at base port 0x%x\n", ioaddr);
        goto out2;
    }

    hp100_page(ID_MAC_ADDR);
    for (i = uc = 0; i < 7; i++)
        uc += hp100_inb(LAN_ADDR + i);
    if (uc != 0xff) {
        printk(KERN_WARNING "hp100_probe: bad lan address checksum at port 0x%x)\n", ioaddr);
        err = -EIO;
        goto out2;
    }

    /* Make sure, that all registers are correctly updated... */

    hp100_load_eeprom(dev, ioaddr);
    wait();

    /*
     * Determine driver operation mode
     *
     * Use the variable "hp100_mode" upon insmod or as kernel parameter to
     * force driver modes:
     * hp100_mode=1 -> default, use busmaster mode if configured.
     * hp100_mode=2 -> enable shared memory mode
     * hp100_mode=3 -> force use of i/o mapped mode.
     * hp100_mode=4 -> same as 1, but re-set the enable bit on the card.
     */

    /*
     * LSW values:
     *   0x2278 -> J2585B, PnP shared memory mode
     *   0x2270 -> J2585B, shared memory mode, 0xdc000
     *   0xa23c -> J2585B, I/O mapped mode
     *   0x2240 -> EISA COMPEX, BusMaster (Shasta Chip)
     *   0x2220 -> EISA HP, I/O (Shasta Chip)
     *   0x2260 -> EISA HP, BusMaster (Shasta Chip)
     */

#if 0
    local_mode = 0x2270;
    hp100_outw(0xfefe, OPTION_LSW);
    hp100_outw(local_mode | HP100_SET_LB | HP100_SET_HB, OPTION_LSW);
#endif

    /* hp100_mode value maybe used in future by another card */
    local_mode = hp100_mode;
    if (local_mode < 1 || local_mode > 4)
        local_mode = 1; /* default */
#ifdef HP100_DEBUG
    printk("hp100: %s: original LSW = 0x%x\n", dev->name,
           hp100_inw(OPTION_LSW));
#endif

    if (local_mode == 3) {
        hp100_outw(HP100_MEM_EN | HP100_RESET_LB, OPTION_LSW);
        hp100_outw(HP100_IO_EN | HP100_SET_LB, OPTION_LSW);
        hp100_outw(HP100_BM_WRITE | HP100_BM_READ | HP100_RESET_HB, OPTION_LSW);
        printk("hp100: IO mapped mode forced.\n");
    } else if (local_mode == 2) {
        hp100_outw(HP100_MEM_EN | HP100_SET_LB, OPTION_LSW);
        hp100_outw(HP100_IO_EN | HP100_SET_LB, OPTION_LSW);
        hp100_outw(HP100_BM_WRITE | HP100_BM_READ | HP100_RESET_HB, OPTION_LSW);
        printk("hp100: Shared memory mode requested.\n");
    } else if (local_mode == 4) {
        if (chip == HP100_CHIPID_LASSEN) {
            hp100_outw(HP100_BM_WRITE | HP100_BM_READ | HP100_SET_HB, OPTION_LSW);
            hp100_outw(HP100_IO_EN | HP100_MEM_EN | HP100_RESET_LB, OPTION_LSW);
            printk("hp100: Busmaster mode requested.\n");
        }
        local_mode = 1;
    }

    if (local_mode == 1) {  /* default behaviour */
        lsw = hp100_inw(OPTION_LSW);

        if ((lsw & HP100_IO_EN) && (~lsw & HP100_MEM_EN) &&
            (~lsw & (HP100_BM_WRITE | HP100_BM_READ))) {
#ifdef HP100_DEBUG
            printk("hp100: %s: IO_EN bit is set on card.\n", dev->name);
#endif
            local_mode = 3;
        } else if (chip == HP100_CHIPID_LASSEN &&
               (lsw & (HP100_BM_WRITE | HP100_BM_READ)) == (HP100_BM_WRITE | HP100_BM_READ)) {
            /* Conversion to new PCI API :
             * I don't have the doc, but I assume that the card
             * can map the full 32bit address space.
             * Also, we can have EISA Busmaster cards (not tested),
             * so beware !!! - Jean II */
            if((bus == HP100_BUS_PCI) &&
               (pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32)))) {
                /* Gracefully fallback to shared memory */
                goto busmasterfail;
            }
            printk("hp100: Busmaster mode enabled.\n");
            hp100_outw(HP100_MEM_EN | HP100_IO_EN | HP100_RESET_LB, OPTION_LSW);
        } else {
        busmasterfail:
#ifdef HP100_DEBUG
            printk("hp100: %s: Card not configured for BM or BM not supported with this card.\n", dev->name);
            printk("hp100: %s: Trying shared memory mode.\n", dev->name);
#endif
            /* In this case, try shared memory mode */
            local_mode = 2;
            hp100_outw(HP100_MEM_EN | HP100_SET_LB, OPTION_LSW);
            /* hp100_outw(HP100_IO_EN|HP100_RESET_LB, OPTION_LSW); */
        }
    }
#ifdef HP100_DEBUG
    printk("hp100: %s: new LSW = 0x%x\n", dev->name, hp100_inw(OPTION_LSW));
#endif

    /* Check for shared memory on the card, eventually remap it */
    hp100_page(HW_MAP);
    mem_mapped = ((hp100_inw(OPTION_LSW) & (HP100_MEM_EN)) != 0);
    mem_ptr_phys = 0UL;
    mem_ptr_virt = NULL;
    memory_size = (8192 << ((hp100_inb(SRAM) >> 5) & 0x07));
    virt_memory_size = 0;

    /* For memory mapped or busmaster mode, we want the memory address */
    if (mem_mapped || (local_mode == 1)) {
        mem_ptr_phys = (hp100_inw(MEM_MAP_LSW) | (hp100_inw(MEM_MAP_MSW) << 16));
        mem_ptr_phys &= ~0x1fff;    /* 8k alignment */

        if (bus == HP100_BUS_ISA && (mem_ptr_phys & ~0xfffff) != 0) {
            printk("hp100: Can only use programmed i/o mode.\n");
            mem_ptr_phys = 0;
            mem_mapped = 0;
            local_mode = 3; /* Use programmed i/o */
        }

        /* We do not need access to shared memory in busmaster mode */
        /* However in slave mode we need to remap high (>1GB) card memory  */
        if (local_mode != 1) {  /* = not busmaster */
            /* We try with smaller memory sizes, if ioremap fails */
            for (virt_memory_size = memory_size; virt_memory_size > 16383; virt_memory_size >>= 1) {
                if ((mem_ptr_virt = ioremap((u_long) mem_ptr_phys, virt_memory_size)) == NULL) {
#ifdef HP100_DEBUG
                    printk("hp100: %s: ioremap for 0x%x bytes high PCI memory at 0x%lx failed\n", dev->name, virt_memory_size, mem_ptr_phys);
#endif
                } else {
#ifdef HP100_DEBUG
                    printk("hp100: %s: remapped 0x%x bytes high PCI memory at 0x%lx to %p.\n", dev->name, virt_memory_size, mem_ptr_phys, mem_ptr_virt);
#endif
                    break;
                }
            }

            if (mem_ptr_virt == NULL) { /* all ioremap tries failed */
                printk("hp100: Failed to ioremap the PCI card memory. Will have to use i/o mapped mode.\n");
                local_mode = 3;
                virt_memory_size = 0;
            }
        }
    }

    if (local_mode == 3) {  /* io mapped forced */
        mem_mapped = 0;
        mem_ptr_phys = 0;
        mem_ptr_virt = NULL;
        printk("hp100: Using (slow) programmed i/o mode.\n");
    }

    /* Initialise the "private" data structure for this card. */
    lp = netdev_priv(dev);

    spin_lock_init(&lp->lock);
    strlcpy(lp->id, eid, HP100_SIG_LEN);
    lp->chip = chip;
    lp->mode = local_mode;
    lp->bus = bus;
    lp->pci_dev = pci_dev;
    lp->priority_tx = hp100_priority_tx;
    lp->rx_ratio = hp100_rx_ratio;
    lp->mem_ptr_phys = mem_ptr_phys;
    lp->mem_ptr_virt = mem_ptr_virt;
    hp100_page(ID_MAC_ADDR);
    lp->soft_model = hp100_inb(SOFT_MODEL);
    lp->mac1_mode = HP100_MAC1MODE3;
    lp->mac2_mode = HP100_MAC2MODE3;
    memset(&lp->hash_bytes, 0x00, 8);

    dev->base_addr = ioaddr;

    lp->memory_size = memory_size;
    lp->virt_memory_size = virt_memory_size;
    lp->rx_ratio = hp100_rx_ratio;  /* can be conf'd with insmod */

    if (lp->mode == 1)  /* busmaster */
        dev->netdev_ops = &hp100_bm_netdev_ops;
    else
        dev->netdev_ops = &hp100_netdev_ops;

    /* Ask the card for which IRQ line it is configured */
    if (bus == HP100_BUS_PCI) {
        dev->irq = pci_dev->irq;
    } else {
        hp100_page(HW_MAP);
        dev->irq = hp100_inb(IRQ_CHANNEL) & HP100_IRQMASK;
        if (dev->irq == 2)
            dev->irq = 9;
    }

    if (lp->mode == 1)  /* busmaster */
        dev->dma = 4;

    /* Ask the card for its MAC address and store it for later use. */
    hp100_page(ID_MAC_ADDR);
    for (i = uc = 0; i < 6; i++)
        dev->dev_addr[i] = hp100_inb(LAN_ADDR + i);

    /* Reset statistics (counters) */
    hp100_clear_stats(lp, ioaddr);

    /* If busmaster mode is wanted, a dma-capable memory area is needed for
     * the rx and tx PDLs
     * PCI cards can access the whole PC memory. Therefore GFP_DMA is not
     * needed for the allocation of the memory area.
     */

    /* TODO: We do not need this with old cards, where PDLs are stored
     * in the cards shared memory area. But currently, busmaster has been
     * implemented/tested only with the lassen chip anyway... */
    if (lp->mode == 1) {    /* busmaster */
        dma_addr_t page_baddr;
        /* Get physically continuous memory for TX & RX PDLs    */
        /* Conversion to new PCI API :
         * Pages are always aligned and zeroed, no need to it ourself.
         * Doc says should be OK for EISA bus as well - Jean II */
        lp->page_vaddr_algn = pci_alloc_consistent(lp->pci_dev, MAX_RINGSIZE, &page_baddr);
        if (!lp->page_vaddr_algn) {
            err = -ENOMEM;
            goto out_mem_ptr;
        }
        lp->whatever_offset = ((u_long) page_baddr) - ((u_long) lp->page_vaddr_algn);

#ifdef HP100_DEBUG_BM
        printk("hp100: %s: Reserved DMA memory from 0x%x to 0x%x\n", dev->name, (u_int) lp->page_vaddr_algn, (u_int) lp->page_vaddr_algn + MAX_RINGSIZE);
#endif
        lp->rxrcommit = lp->txrcommit = 0;
        lp->rxrhead = lp->rxrtail = &(lp->rxring[0]);
        lp->txrhead = lp->txrtail = &(lp->txring[0]);
    }

    /* Initialise the card. */
    /* (I'm not really sure if it's a good idea to do this during probing, but
     * like this it's assured that the lan connection type can be sensed
     * correctly)
     */
    hp100_hwinit(dev);

    /* Try to find out which kind of LAN the card is connected to. */
    lp->lan_type = hp100_sense_lan(dev);

    /* Print out a message what about what we think we have probed. */
    printk("hp100: at 0x%x, IRQ %d, ", ioaddr, dev->irq);
    switch (bus) {
    case HP100_BUS_EISA:
        printk("EISA");
        break;
    case HP100_BUS_PCI:
        printk("PCI");
        break;
    default:
        printk("ISA");
        break;
    }
    printk(" bus, %dk SRAM (rx/tx %d%%).\n", lp->memory_size >> 10, lp->rx_ratio);

    if (lp->mode == 2) {    /* memory mapped */
        printk("hp100: Memory area at 0x%lx-0x%lx", mem_ptr_phys,
                (mem_ptr_phys + (mem_ptr_phys > 0x100000 ? (u_long) lp->memory_size : 16 * 1024)) - 1);
        if (mem_ptr_virt)
            printk(" (virtual base %p)", mem_ptr_virt);
        printk(".\n");

        /* Set for info when doing ifconfig */
        dev->mem_start = mem_ptr_phys;
        dev->mem_end = mem_ptr_phys + lp->memory_size;
    }

    printk("hp100: ");
    if (lp->lan_type != HP100_LAN_ERR)
        printk("Adapter is attached to ");
    switch (lp->lan_type) {
    case HP100_LAN_100:
        printk("100Mb/s Voice Grade AnyLAN network.\n");
        break;
    case HP100_LAN_10:
        printk("10Mb/s network (10baseT).\n");
        break;
    case HP100_LAN_COAX:
        printk("10Mb/s network (coax).\n");
        break;
    default:
        printk("Warning! Link down.\n");
    }

    err = register_netdev(dev);
    if (err)
        goto out3;

    return 0;
out3:
    if (local_mode == 1)
        pci_free_consistent(lp->pci_dev, MAX_RINGSIZE + 0x0f,
                    lp->page_vaddr_algn,
                    virt_to_whatever(dev, lp->page_vaddr_algn));
out_mem_ptr:
    if (mem_ptr_virt)
        iounmap(mem_ptr_virt);
out2:
    release_region(ioaddr, HP100_REGION_SIZE);
out1:
    return err;
}

/* This procedure puts the card into a stable init state */
static void hp100_hwinit(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4202, TRACE);
    printk("hp100: %s: hwinit\n", dev->name);
#endif

    /* Initialise the card. -------------------------------------------- */

    /* Clear all pending Ints and disable Ints */
    hp100_page(PERFORMANCE);
    hp100_outw(0xfefe, IRQ_MASK);   /* mask off all ints */
    hp100_outw(0xffff, IRQ_STATUS); /* clear all pending ints */

    hp100_outw(HP100_INT_EN | HP100_RESET_LB, OPTION_LSW);
    hp100_outw(HP100_TRI_INT | HP100_SET_HB, OPTION_LSW);

    if (lp->mode == 1) {
        hp100_BM_shutdown(dev); /* disables BM, puts cascade in reset */
        wait();
    } else {
        hp100_outw(HP100_INT_EN | HP100_RESET_LB, OPTION_LSW);
        hp100_cascade_reset(dev, 1);
        hp100_page(MAC_CTRL);
        hp100_andb(~(HP100_RX_EN | HP100_TX_EN), MAC_CFG_1);
    }

    /* Initiate EEPROM reload */
    hp100_load_eeprom(dev, 0);

    wait();

    /* Go into reset again. */
    hp100_cascade_reset(dev, 1);

    /* Set Option Registers to a safe state  */
    hp100_outw(HP100_DEBUG_EN |
           HP100_RX_HDR |
           HP100_EE_EN |
           HP100_BM_WRITE |
           HP100_BM_READ | HP100_RESET_HB |
           HP100_FAKE_INT |
           HP100_INT_EN |
           HP100_MEM_EN |
           HP100_IO_EN | HP100_RESET_LB, OPTION_LSW);

    hp100_outw(HP100_TRI_INT |
           HP100_MMAP_DIS | HP100_SET_HB, OPTION_LSW);

    hp100_outb(HP100_PRIORITY_TX |
           HP100_ADV_NXT_PKT |
           HP100_TX_CMD | HP100_RESET_LB, OPTION_MSW);

    /* TODO: Configure MMU for Ram Test. */
    /* TODO: Ram Test. */

    /* Re-check if adapter is still at same i/o location      */
    /* (If the base i/o in eeprom has been changed but the    */
    /* registers had not been changed, a reload of the eeprom */
    /* would move the adapter to the address stored in eeprom */

    /* TODO: Code to implement. */

    /* Until here it was code from HWdiscover procedure. */
    /* Next comes code from mmuinit procedure of SCO BM driver which is
     * called from HWconfigure in the SCO driver.  */

    /* Initialise MMU, eventually switch on Busmaster Mode, initialise
     * multicast filter...
     */
    hp100_mmuinit(dev);

    /* We don't turn the interrupts on here - this is done by start_interface. */
    wait();         /* TODO: Do we really need this? */

    /* Enable Hardware (e.g. unreset) */
    hp100_cascade_reset(dev, 0);

    /* ------- initialisation complete ----------- */

    /* Finally try to log in the Hub if there may be a VG connection. */
    if ((lp->lan_type == HP100_LAN_100) || (lp->lan_type == HP100_LAN_ERR))
        hp100_login_to_vg_hub(dev, 0);  /* relogin */

}


/*
 * mmuinit - Reinitialise Cascade MMU and MAC settings.
 * Note: Must already be in reset and leaves card in reset.
 */
static void hp100_mmuinit(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);
    int i;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4203, TRACE);
    printk("hp100: %s: mmuinit\n", dev->name);
#endif

#ifdef HP100_DEBUG
    if (0 != (hp100_inw(OPTION_LSW) & HP100_HW_RST)) {
        printk("hp100: %s: Not in reset when entering mmuinit. Fix me.\n", dev->name);
        return;
    }
#endif

    /* Make sure IRQs are masked off and ack'ed. */
    hp100_page(PERFORMANCE);
    hp100_outw(0xfefe, IRQ_MASK);   /* mask off all ints */
    hp100_outw(0xffff, IRQ_STATUS); /* ack IRQ */

    /*
     * Enable Hardware
     * - Clear Debug En, Rx Hdr Pipe, EE En, I/O En, Fake Int and Intr En
     * - Set Tri-State Int, Bus Master Rd/Wr, and Mem Map Disable
     * - Clear Priority, Advance Pkt and Xmit Cmd
     */

    hp100_outw(HP100_DEBUG_EN |
           HP100_RX_HDR |
           HP100_EE_EN | HP100_RESET_HB |
           HP100_IO_EN |
           HP100_FAKE_INT |
           HP100_INT_EN | HP100_RESET_LB, OPTION_LSW);

    hp100_outw(HP100_TRI_INT | HP100_SET_HB, OPTION_LSW);

    if (lp->mode == 1) {    /* busmaster */
        hp100_outw(HP100_BM_WRITE |
               HP100_BM_READ |
               HP100_MMAP_DIS | HP100_SET_HB, OPTION_LSW);
    } else if (lp->mode == 2) { /* memory mapped */
        hp100_outw(HP100_BM_WRITE |
               HP100_BM_READ | HP100_RESET_HB, OPTION_LSW);
        hp100_outw(HP100_MMAP_DIS | HP100_RESET_HB, OPTION_LSW);
        hp100_outw(HP100_MEM_EN | HP100_SET_LB, OPTION_LSW);
        hp100_outw(HP100_IO_EN | HP100_SET_LB, OPTION_LSW);
    } else if (lp->mode == 3) { /* i/o mapped mode */
        hp100_outw(HP100_MMAP_DIS | HP100_SET_HB |
               HP100_IO_EN | HP100_SET_LB, OPTION_LSW);
    }

    hp100_page(HW_MAP);
    hp100_outb(0, EARLYRXCFG);
    hp100_outw(0, EARLYTXCFG);

    /*
     * Enable Bus Master mode
     */
    if (lp->mode == 1) {    /* busmaster */
        /* Experimental: Set some PCI configuration bits */
        hp100_page(HW_MAP);
        hp100_andb(~HP100_PDL_USE3, MODECTRL1); /* BM engine read maximum */
        hp100_andb(~HP100_TX_DUALQ, MODECTRL1); /* No Queue for Priority TX */

        /* PCI Bus failures should result in a Misc. Interrupt */
        hp100_orb(HP100_EN_BUS_FAIL, MODECTRL2);

        hp100_outw(HP100_BM_READ | HP100_BM_WRITE | HP100_SET_HB, OPTION_LSW);
        hp100_page(HW_MAP);
        /* Use Burst Mode and switch on PAGE_CK */
        hp100_orb(HP100_BM_BURST_RD | HP100_BM_BURST_WR, BM);
        if ((lp->chip == HP100_CHIPID_RAINIER) || (lp->chip == HP100_CHIPID_SHASTA))
            hp100_orb(HP100_BM_PAGE_CK, BM);
        hp100_orb(HP100_BM_MASTER, BM);
    } else {        /* not busmaster */

        hp100_page(HW_MAP);
        hp100_andb(~HP100_BM_MASTER, BM);
    }

    /*
     * Divide card memory into regions for Rx, Tx and, if non-ETR chip, PDLs
     */
    hp100_page(MMU_CFG);
    if (lp->mode == 1) {    /* only needed for Busmaster */
        int xmit_stop, recv_stop;

        if ((lp->chip == HP100_CHIPID_RAINIER) ||
            (lp->chip == HP100_CHIPID_SHASTA)) {
            int pdl_stop;

            /*
             * Each pdl is 508 bytes long. (63 frags * 4 bytes for address and
             * 4 bytes for header). We will leave NUM_RXPDLS * 508 (rounded
             * to the next higher 1k boundary) bytes for the rx-pdl's
             * Note: For non-etr chips the transmit stop register must be
             * programmed on a 1k boundary, i.e. bits 9:0 must be zero.
             */
            pdl_stop = lp->memory_size;
            xmit_stop = (pdl_stop - 508 * (MAX_RX_PDL) - 16) & ~(0x03ff);
            recv_stop = (xmit_stop * (lp->rx_ratio) / 100) & ~(0x03ff);
            hp100_outw((pdl_stop >> 4) - 1, PDL_MEM_STOP);
#ifdef HP100_DEBUG_BM
            printk("hp100: %s: PDL_STOP = 0x%x\n", dev->name, pdl_stop);
#endif
        } else {
            /* ETR chip (Lassen) in busmaster mode */
            xmit_stop = (lp->memory_size) - 1;
            recv_stop = ((lp->memory_size * lp->rx_ratio) / 100) & ~(0x03ff);
        }

        hp100_outw(xmit_stop >> 4, TX_MEM_STOP);
        hp100_outw(recv_stop >> 4, RX_MEM_STOP);
#ifdef HP100_DEBUG_BM
        printk("hp100: %s: TX_STOP  = 0x%x\n", dev->name, xmit_stop >> 4);
        printk("hp100: %s: RX_STOP  = 0x%x\n", dev->name, recv_stop >> 4);
#endif
    } else {
        /* Slave modes (memory mapped and programmed io)  */
        hp100_outw((((lp->memory_size * lp->rx_ratio) / 100) >> 4), RX_MEM_STOP);
        hp100_outw(((lp->memory_size - 1) >> 4), TX_MEM_STOP);
#ifdef HP100_DEBUG
        printk("hp100: %s: TX_MEM_STOP: 0x%x\n", dev->name, hp100_inw(TX_MEM_STOP));
        printk("hp100: %s: RX_MEM_STOP: 0x%x\n", dev->name, hp100_inw(RX_MEM_STOP));
#endif
    }

    /* Write MAC address into page 1 */
    hp100_page(MAC_ADDRESS);
    for (i = 0; i < 6; i++)
        hp100_outb(dev->dev_addr[i], MAC_ADDR + i);

    /* Zero the multicast hash registers */
    for (i = 0; i < 8; i++)
        hp100_outb(0x0, HASH_BYTE0 + i);

    /* Set up MAC defaults */
    hp100_page(MAC_CTRL);

    /* Go to LAN Page and zero all filter bits */
    /* Zero accept error, accept multicast, accept broadcast and accept */
    /* all directed packet bits */
    hp100_andb(~(HP100_RX_EN |
             HP100_TX_EN |
             HP100_ACC_ERRORED |
             HP100_ACC_MC |
             HP100_ACC_BC | HP100_ACC_PHY), MAC_CFG_1);

    hp100_outb(0x00, MAC_CFG_2);

    /* Zero the frame format bit. This works around a training bug in the */
    /* new hubs. */
    hp100_outb(0x00, VG_LAN_CFG_2); /* (use 802.3) */

    if (lp->priority_tx)
        hp100_outb(HP100_PRIORITY_TX | HP100_SET_LB, OPTION_MSW);
    else
        hp100_outb(HP100_PRIORITY_TX | HP100_RESET_LB, OPTION_MSW);

    hp100_outb(HP100_ADV_NXT_PKT |
           HP100_TX_CMD | HP100_RESET_LB, OPTION_MSW);

    /* If busmaster, initialize the PDLs */
    if (lp->mode == 1)
        hp100_init_pdls(dev);

    /* Go to performance page and initialize isr and imr registers */
    hp100_page(PERFORMANCE);
    hp100_outw(0xfefe, IRQ_MASK);   /* mask off all ints */
    hp100_outw(0xffff, IRQ_STATUS); /* ack IRQ */
}

/*
 *  open/close functions
 */

static int hp100_open(struct net_device *dev)
{
    struct hp100_private *lp = netdev_priv(dev);
#ifdef HP100_DEBUG_B
    int ioaddr = dev->base_addr;
#endif

#ifdef HP100_DEBUG_B
    hp100_outw(0x4204, TRACE);
    printk("hp100: %s: open\n", dev->name);
#endif

    /* New: if bus is PCI or EISA, interrupts might be shared interrupts */
    if (request_irq(dev->irq, hp100_interrupt,
            lp->bus == HP100_BUS_PCI || lp->bus ==
            HP100_BUS_EISA ? IRQF_SHARED : IRQF_DISABLED,
            "hp100", dev)) {
        printk("hp100: %s: unable to get IRQ %d\n", dev->name, dev->irq);
        return -EAGAIN;
    }

    dev->trans_start = jiffies; /* prevent tx timeout */
    netif_start_queue(dev);

    lp->lan_type = hp100_sense_lan(dev);
    lp->mac1_mode = HP100_MAC1MODE3;
    lp->mac2_mode = HP100_MAC2MODE3;
    memset(&lp->hash_bytes, 0x00, 8);

    hp100_stop_interface(dev);

    hp100_hwinit(dev);

    hp100_start_interface(dev); /* sets mac modes, enables interrupts */

    return 0;
}

/* The close function is called when the interface is to be brought down */
static int hp100_close(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4205, TRACE);
    printk("hp100: %s: close\n", dev->name);
#endif

    hp100_page(PERFORMANCE);
    hp100_outw(0xfefe, IRQ_MASK);   /* mask off all IRQs */

    hp100_stop_interface(dev);

    if (lp->lan_type == HP100_LAN_100)
        lp->hub_status = hp100_login_to_vg_hub(dev, 0);

    netif_stop_queue(dev);

    free_irq(dev->irq, dev);

#ifdef HP100_DEBUG
    printk("hp100: %s: close LSW = 0x%x\n", dev->name,
           hp100_inw(OPTION_LSW));
#endif

    return 0;
}


/*
 * Configure the PDL Rx rings and LAN
 */
static void hp100_init_pdls(struct net_device *dev)
{
    struct hp100_private *lp = netdev_priv(dev);
    hp100_ring_t *ringptr;
    u_int *pageptr;     /* Warning : increment by 4 - Jean II */
    int i;

#ifdef HP100_DEBUG_B
    int ioaddr = dev->base_addr;
#endif

#ifdef HP100_DEBUG_B
    hp100_outw(0x4206, TRACE);
    printk("hp100: %s: init pdls\n", dev->name);
#endif

    if (!lp->page_vaddr_algn)
        printk("hp100: %s: Warning: lp->page_vaddr_algn not initialised!\n", dev->name);
    else {
        /* pageptr shall point into the DMA accessible memory region  */
        /* we use this pointer to status the upper limit of allocated */
        /* memory in the allocated page. */
        /* note: align the pointers to the pci cache line size */
        memset(lp->page_vaddr_algn, 0, MAX_RINGSIZE);   /* Zero  Rx/Tx ring page */
        pageptr = lp->page_vaddr_algn;

        lp->rxrcommit = 0;
        ringptr = lp->rxrhead = lp->rxrtail = &(lp->rxring[0]);

        /* Initialise Rx Ring */
        for (i = MAX_RX_PDL - 1; i >= 0; i--) {
            lp->rxring[i].next = ringptr;
            ringptr = &(lp->rxring[i]);
            pageptr += hp100_init_rxpdl(dev, ringptr, pageptr);
        }

        /* Initialise Tx Ring */
        lp->txrcommit = 0;
        ringptr = lp->txrhead = lp->txrtail = &(lp->txring[0]);
        for (i = MAX_TX_PDL - 1; i >= 0; i--) {
            lp->txring[i].next = ringptr;
            ringptr = &(lp->txring[i]);
            pageptr += hp100_init_txpdl(dev, ringptr, pageptr);
        }
    }
}


/* These functions "format" the entries in the pdl structure   */
/* They return how much memory the fragments need.            */
static int hp100_init_rxpdl(struct net_device *dev,
                register hp100_ring_t * ringptr,
                register u32 * pdlptr)
{
    /* pdlptr is starting address for this pdl */

    if (0 != (((unsigned long) pdlptr) & 0xf))
        printk("hp100: %s: Init rxpdl: Unaligned pdlptr 0x%lx.\n",
               dev->name, (unsigned long) pdlptr);

    ringptr->pdl = pdlptr + 1;
    ringptr->pdl_paddr = virt_to_whatever(dev, pdlptr + 1);
    ringptr->skb = NULL;

    /*
     * Write address and length of first PDL Fragment (which is used for
     * storing the RX-Header
     * We use the 4 bytes _before_ the PDH in the pdl memory area to
     * store this information. (PDH is at offset 0x04)
     */
    /* Note that pdlptr+1 and not pdlptr is the pointer to the PDH */

    *(pdlptr + 2) = (u_int) virt_to_whatever(dev, pdlptr);  /* Address Frag 1 */
    *(pdlptr + 3) = 4;  /* Length  Frag 1 */

    return roundup(MAX_RX_FRAG * 2 + 2, 4);
}


static int hp100_init_txpdl(struct net_device *dev,
                register hp100_ring_t * ringptr,
                register u32 * pdlptr)
{
    if (0 != (((unsigned long) pdlptr) & 0xf))
        printk("hp100: %s: Init txpdl: Unaligned pdlptr 0x%lx.\n", dev->name, (unsigned long) pdlptr);

    ringptr->pdl = pdlptr;  /* +1; */
    ringptr->pdl_paddr = virt_to_whatever(dev, pdlptr); /* +1 */
    ringptr->skb = NULL;

    return roundup(MAX_TX_FRAG * 2 + 2, 4);
}

/*
 * hp100_build_rx_pdl allocates an skb_buff of maximum size plus two bytes
 * for possible odd word alignment rounding up to next dword and set PDL
 * address for fragment#2
 * Returns: 0 if unable to allocate skb_buff
 *          1 if successful
 */
static int hp100_build_rx_pdl(hp100_ring_t * ringptr,
                  struct net_device *dev)
{
#ifdef HP100_DEBUG_B
    int ioaddr = dev->base_addr;
#endif
#ifdef HP100_DEBUG_BM
    u_int *p;
#endif

#ifdef HP100_DEBUG_B
    hp100_outw(0x4207, TRACE);
    printk("hp100: %s: build rx pdl\n", dev->name);
#endif

    /* Allocate skb buffer of maximum size */
    /* Note: This depends on the alloc_skb functions allocating more
     * space than requested, i.e. aligning to 16bytes */

    ringptr->skb = netdev_alloc_skb(dev, roundup(MAX_ETHER_SIZE + 2, 4));

    if (NULL != ringptr->skb) {
        /*
         * Reserve 2 bytes at the head of the buffer to land the IP header
         * on a long word boundary (According to the Network Driver section
         * in the Linux KHG, this should help to increase performance.)
         */
        skb_reserve(ringptr->skb, 2);

        ringptr->skb->data = (u_char *) skb_put(ringptr->skb, MAX_ETHER_SIZE);

        /* ringptr->pdl points to the beginning of the PDL, i.e. the PDH */
        /* Note: 1st Fragment is used for the 4 byte packet status
         * (receive header). Its PDL entries are set up by init_rxpdl. So
         * here we only have to set up the PDL fragment entries for the data
         * part. Those 4 bytes will be stored in the DMA memory region
         * directly before the PDL.
         */
#ifdef HP100_DEBUG_BM
        printk("hp100: %s: build_rx_pdl: PDH@0x%x, skb->data (len %d) at 0x%x\n",
                     dev->name, (u_int) ringptr->pdl,
                     roundup(MAX_ETHER_SIZE + 2, 4),
                     (unsigned int) ringptr->skb->data);
#endif

        /* Conversion to new PCI API : map skbuf data to PCI bus.
         * Doc says it's OK for EISA as well - Jean II */
        ringptr->pdl[0] = 0x00020000;   /* Write PDH */
        ringptr->pdl[3] = pdl_map_data(netdev_priv(dev),
                           ringptr->skb->data);
        ringptr->pdl[4] = MAX_ETHER_SIZE;   /* Length of Data */

#ifdef HP100_DEBUG_BM
        for (p = (ringptr->pdl); p < (ringptr->pdl + 5); p++)
            printk("hp100: %s: Adr 0x%.8x = 0x%.8x\n", dev->name, (u_int) p, (u_int) * p);
#endif
        return 1;
    }
    /* else: */
    /* alloc_skb failed (no memory) -> still can receive the header
     * fragment into PDL memory. make PDL safe by clearing msgptr and
     * making the PDL only 1 fragment (i.e. the 4 byte packet status)
     */
#ifdef HP100_DEBUG_BM
    printk("hp100: %s: build_rx_pdl: PDH@0x%x, No space for skb.\n", dev->name, (u_int) ringptr->pdl);
#endif

    ringptr->pdl[0] = 0x00010000;   /* PDH: Count=1 Fragment */

    return 0;
}

/*
 *  hp100_rxfill - attempt to fill the Rx Ring will empty skb's
 *
 * Makes assumption that skb's are always contiguous memory areas and
 * therefore PDLs contain only 2 physical fragments.
 * -  While the number of Rx PDLs with buffers is less than maximum
 *      a.  Get a maximum packet size skb
 *      b.  Put the physical address of the buffer into the PDL.
 *      c.  Output physical address of PDL to adapter.
 */
static void hp100_rxfill(struct net_device *dev)
{
    int ioaddr = dev->base_addr;

    struct hp100_private *lp = netdev_priv(dev);
    hp100_ring_t *ringptr;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4208, TRACE);
    printk("hp100: %s: rxfill\n", dev->name);
#endif

    hp100_page(PERFORMANCE);

    while (lp->rxrcommit < MAX_RX_PDL) {
        /*
           ** Attempt to get a buffer and build a Rx PDL.
         */
        ringptr = lp->rxrtail;
        if (0 == hp100_build_rx_pdl(ringptr, dev)) {
            return; /* None available, return */
        }

        /* Hand this PDL over to the card */
        /* Note: This needs performance page selected! */
#ifdef HP100_DEBUG_BM
        printk("hp100: %s: rxfill: Hand to card: pdl #%d @0x%x phys:0x%x, buffer: 0x%x\n",
                     dev->name, lp->rxrcommit, (u_int) ringptr->pdl,
                     (u_int) ringptr->pdl_paddr, (u_int) ringptr->pdl[3]);
#endif

        hp100_outl((u32) ringptr->pdl_paddr, RX_PDA);

        lp->rxrcommit += 1;
        lp->rxrtail = ringptr->next;
    }
}

/*
 * BM_shutdown - shutdown bus mastering and leave chip in reset state
 */

static void hp100_BM_shutdown(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);
    unsigned long time;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4209, TRACE);
    printk("hp100: %s: bm shutdown\n", dev->name);
#endif

    hp100_page(PERFORMANCE);
    hp100_outw(0xfefe, IRQ_MASK);   /* mask off all ints */
    hp100_outw(0xffff, IRQ_STATUS); /* Ack all ints */

    /* Ensure Interrupts are off */
    hp100_outw(HP100_INT_EN | HP100_RESET_LB, OPTION_LSW);

    /* Disable all MAC activity */
    hp100_page(MAC_CTRL);
    hp100_andb(~(HP100_RX_EN | HP100_TX_EN), MAC_CFG_1);    /* stop rx/tx */

    /* If cascade MMU is not already in reset */
    if (0 != (hp100_inw(OPTION_LSW) & HP100_HW_RST)) {
        /* Wait 1.3ms (10Mb max packet time) to ensure MAC is idle so
         * MMU pointers will not be reset out from underneath
         */
        hp100_page(MAC_CTRL);
        for (time = 0; time < 5000; time++) {
            if ((hp100_inb(MAC_CFG_1) & (HP100_TX_IDLE | HP100_RX_IDLE)) == (HP100_TX_IDLE | HP100_RX_IDLE))
                break;
        }

        /* Shutdown algorithm depends on the generation of Cascade */
        if (lp->chip == HP100_CHIPID_LASSEN) {  /* ETR shutdown/reset */
            /* Disable Busmaster mode and wait for bit to go to zero. */
            hp100_page(HW_MAP);
            hp100_andb(~HP100_BM_MASTER, BM);
            /* 100 ms timeout */
            for (time = 0; time < 32000; time++) {
                if (0 == (hp100_inb(BM) & HP100_BM_MASTER))
                    break;
            }
        } else {    /* Shasta or Rainier Shutdown/Reset */
            /* To ensure all bus master inloading activity has ceased,
             * wait for no Rx PDAs or no Rx packets on card.
             */
            hp100_page(PERFORMANCE);
            /* 100 ms timeout */
            for (time = 0; time < 10000; time++) {
                /* RX_PDL: PDLs not executed. */
                /* RX_PKT_CNT: RX'd packets on card. */
                if ((hp100_inb(RX_PDL) == 0) && (hp100_inb(RX_PKT_CNT) == 0))
                    break;
            }

            if (time >= 10000)
                printk("hp100: %s: BM shutdown error.\n", dev->name);

            /* To ensure all bus master outloading activity has ceased,
             * wait until the Tx PDA count goes to zero or no more Tx space
             * available in the Tx region of the card.
             */
            /* 100 ms timeout */
            for (time = 0; time < 10000; time++) {
                if ((0 == hp100_inb(TX_PKT_CNT)) &&
                    (0 != (hp100_inb(TX_MEM_FREE) & HP100_AUTO_COMPARE)))
                    break;
            }

            /* Disable Busmaster mode */
            hp100_page(HW_MAP);
            hp100_andb(~HP100_BM_MASTER, BM);
        }   /* end of shutdown procedure for non-etr parts */

        hp100_cascade_reset(dev, 1);
    }
    hp100_page(PERFORMANCE);
    /* hp100_outw( HP100_BM_READ | HP100_BM_WRITE | HP100_RESET_HB, OPTION_LSW ); */
    /* Busmaster mode should be shut down now. */
}

static int hp100_check_lan(struct net_device *dev)
{
    struct hp100_private *lp = netdev_priv(dev);

    if (lp->lan_type < 0) { /* no LAN type detected yet? */
        hp100_stop_interface(dev);
        if ((lp->lan_type = hp100_sense_lan(dev)) < 0) {
            printk("hp100: %s: no connection found - check wire\n", dev->name);
            hp100_start_interface(dev); /* 10Mb/s RX packets maybe handled */
            return -EIO;
        }
        if (lp->lan_type == HP100_LAN_100)
            lp->hub_status = hp100_login_to_vg_hub(dev, 0); /* relogin */
        hp100_start_interface(dev);
    }
    return 0;
}

/*
 *  transmit functions
 */

/* tx function for busmaster mode */
static netdev_tx_t hp100_start_xmit_bm(struct sk_buff *skb,
                       struct net_device *dev)
{
    unsigned long flags;
    int i, ok_flag;
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);
    hp100_ring_t *ringptr;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4210, TRACE);
    printk("hp100: %s: start_xmit_bm\n", dev->name);
#endif
    if (skb->len <= 0)
        goto drop;

    if (lp->chip == HP100_CHIPID_SHASTA && skb_padto(skb, ETH_ZLEN))
        return NETDEV_TX_OK;

    /* Get Tx ring tail pointer */
    if (lp->txrtail->next == lp->txrhead) {
        /* No memory. */
#ifdef HP100_DEBUG
        printk("hp100: %s: start_xmit_bm: No TX PDL available.\n", dev->name);
#endif
        /* not waited long enough since last tx? */
        if (time_before(jiffies, dev_trans_start(dev) + HZ))
            goto drop;

        if (hp100_check_lan(dev))
            goto drop;

        if (lp->lan_type == HP100_LAN_100 && lp->hub_status < 0) {
            /* we have a 100Mb/s adapter but it isn't connected to hub */
            printk("hp100: %s: login to 100Mb/s hub retry\n", dev->name);
            hp100_stop_interface(dev);
            lp->hub_status = hp100_login_to_vg_hub(dev, 0);
            hp100_start_interface(dev);
        } else {
            spin_lock_irqsave(&lp->lock, flags);
            hp100_ints_off();   /* Useful ? Jean II */
            i = hp100_sense_lan(dev);
            hp100_ints_on();
            spin_unlock_irqrestore(&lp->lock, flags);
            if (i == HP100_LAN_ERR)
                printk("hp100: %s: link down detected\n", dev->name);
            else if (lp->lan_type != i) {   /* cable change! */
                /* it's very hard - all network settings must be changed!!! */
                printk("hp100: %s: cable change 10Mb/s <-> 100Mb/s detected\n", dev->name);
                lp->lan_type = i;
                hp100_stop_interface(dev);
                if (lp->lan_type == HP100_LAN_100)
                    lp->hub_status = hp100_login_to_vg_hub(dev, 0);
                hp100_start_interface(dev);
            } else {
                printk("hp100: %s: interface reset\n", dev->name);
                hp100_stop_interface(dev);
                if (lp->lan_type == HP100_LAN_100)
                    lp->hub_status = hp100_login_to_vg_hub(dev, 0);
                hp100_start_interface(dev);
            }
        }

        goto drop;
    }

    /*
     * we have to turn int's off before modifying this, otherwise
     * a tx_pdl_cleanup could occur at the same time
     */
    spin_lock_irqsave(&lp->lock, flags);
    ringptr = lp->txrtail;
    lp->txrtail = ringptr->next;

    /* Check whether packet has minimal packet size */
    ok_flag = skb->len >= HP100_MIN_PACKET_SIZE;
    i = ok_flag ? skb->len : HP100_MIN_PACKET_SIZE;

    ringptr->skb = skb;
    ringptr->pdl[0] = ((1 << 16) | i);  /* PDH: 1 Fragment & length */
    if (lp->chip == HP100_CHIPID_SHASTA) {
        /* TODO:Could someone who has the EISA card please check if this works? */
        ringptr->pdl[2] = i;
    } else {        /* Lassen */
        /* In the PDL, don't use the padded size but the real packet size: */
        ringptr->pdl[2] = skb->len; /* 1st Frag: Length of frag */
    }
    /* Conversion to new PCI API : map skbuf data to PCI bus.
     * Doc says it's OK for EISA as well - Jean II */
    ringptr->pdl[1] = ((u32) pci_map_single(lp->pci_dev, skb->data, ringptr->pdl[2], PCI_DMA_TODEVICE));    /* 1st Frag: Adr. of data */

    /* Hand this PDL to the card. */
    hp100_outl(ringptr->pdl_paddr, TX_PDA_L);   /* Low Prio. Queue */

    lp->txrcommit++;

    dev->stats.tx_packets++;
    dev->stats.tx_bytes += skb->len;

    spin_unlock_irqrestore(&lp->lock, flags);

    return NETDEV_TX_OK;

drop:
    dev_kfree_skb(skb);
    return NETDEV_TX_OK;
}


/* clean_txring checks if packets have been sent by the card by reading
 * the TX_PDL register from the performance page and comparing it to the
 * number of committed packets. It then frees the skb's of the packets that
 * obviously have been sent to the network.
 *
 * Needs the PERFORMANCE page selected.
 */
static void hp100_clean_txring(struct net_device *dev)
{
    struct hp100_private *lp = netdev_priv(dev);
    int ioaddr = dev->base_addr;
    int donecount;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4211, TRACE);
    printk("hp100: %s: clean txring\n", dev->name);
#endif

    /* How many PDLs have been transmitted? */
    donecount = (lp->txrcommit) - hp100_inb(TX_PDL);

#ifdef HP100_DEBUG
    if (donecount > MAX_TX_PDL)
        printk("hp100: %s: Warning: More PDLs transmitted than committed to card???\n", dev->name);
#endif

    for (; 0 != donecount; donecount--) {
#ifdef HP100_DEBUG_BM
        printk("hp100: %s: Free skb: data @0x%.8x txrcommit=0x%x TXPDL=0x%x, done=0x%x\n",
                dev->name, (u_int) lp->txrhead->skb->data,
                lp->txrcommit, hp100_inb(TX_PDL), donecount);
#endif
        /* Conversion to new PCI API : NOP */
        pci_unmap_single(lp->pci_dev, (dma_addr_t) lp->txrhead->pdl[1], lp->txrhead->pdl[2], PCI_DMA_TODEVICE);
        dev_kfree_skb_any(lp->txrhead->skb);
        lp->txrhead->skb = NULL;
        lp->txrhead = lp->txrhead->next;
        lp->txrcommit--;
    }
}

/* tx function for slave modes */
static netdev_tx_t hp100_start_xmit(struct sk_buff *skb,
                    struct net_device *dev)
{
    unsigned long flags;
    int i, ok_flag;
    int ioaddr = dev->base_addr;
    u_short val;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4212, TRACE);
    printk("hp100: %s: start_xmit\n", dev->name);
#endif
    if (skb->len <= 0)
        goto drop;

    if (hp100_check_lan(dev))
        goto drop;

    /* If there is not enough free memory on the card... */
    i = hp100_inl(TX_MEM_FREE) & 0x7fffffff;
    if (!(((i / 2) - 539) > (skb->len + 16) && (hp100_inb(TX_PKT_CNT) < 255))) {
#ifdef HP100_DEBUG
        printk("hp100: %s: start_xmit: tx free mem = 0x%x\n", dev->name, i);
#endif
        /* not waited long enough since last failed tx try? */
        if (time_before(jiffies, dev_trans_start(dev) + HZ)) {
#ifdef HP100_DEBUG
            printk("hp100: %s: trans_start timing problem\n",
                   dev->name);
#endif
            goto drop;
        }
        if (lp->lan_type == HP100_LAN_100 && lp->hub_status < 0) {
            /* we have a 100Mb/s adapter but it isn't connected to hub */
            printk("hp100: %s: login to 100Mb/s hub retry\n", dev->name);
            hp100_stop_interface(dev);
            lp->hub_status = hp100_login_to_vg_hub(dev, 0);
            hp100_start_interface(dev);
        } else {
            spin_lock_irqsave(&lp->lock, flags);
            hp100_ints_off();   /* Useful ? Jean II */
            i = hp100_sense_lan(dev);
            hp100_ints_on();
            spin_unlock_irqrestore(&lp->lock, flags);
            if (i == HP100_LAN_ERR)
                printk("hp100: %s: link down detected\n", dev->name);
            else if (lp->lan_type != i) {   /* cable change! */
                /* it's very hard - all network setting must be changed!!! */
                printk("hp100: %s: cable change 10Mb/s <-> 100Mb/s detected\n", dev->name);
                lp->lan_type = i;
                hp100_stop_interface(dev);
                if (lp->lan_type == HP100_LAN_100)
                    lp->hub_status = hp100_login_to_vg_hub(dev, 0);
                hp100_start_interface(dev);
            } else {
                printk("hp100: %s: interface reset\n", dev->name);
                hp100_stop_interface(dev);
                if (lp->lan_type == HP100_LAN_100)
                    lp->hub_status = hp100_login_to_vg_hub(dev, 0);
                hp100_start_interface(dev);
                mdelay(1);
            }
        }
        goto drop;
    }

    for (i = 0; i < 6000 && (hp100_inb(OPTION_MSW) & HP100_TX_CMD); i++) {
#ifdef HP100_DEBUG_TX
        printk("hp100: %s: start_xmit: busy\n", dev->name);
#endif
    }

    spin_lock_irqsave(&lp->lock, flags);
    hp100_ints_off();
    val = hp100_inw(IRQ_STATUS);
    /* Ack / clear the interrupt TX_COMPLETE interrupt - this interrupt is set
     * when the current packet being transmitted on the wire is completed. */
    hp100_outw(HP100_TX_COMPLETE, IRQ_STATUS);
#ifdef HP100_DEBUG_TX
    printk("hp100: %s: start_xmit: irq_status=0x%.4x, irqmask=0x%.4x, len=%d\n",
            dev->name, val, hp100_inw(IRQ_MASK), (int) skb->len);
#endif

    ok_flag = skb->len >= HP100_MIN_PACKET_SIZE;
    i = ok_flag ? skb->len : HP100_MIN_PACKET_SIZE;

    hp100_outw(i, DATA32);  /* tell card the total packet length */
    hp100_outw(i, FRAGMENT_LEN);    /* and first/only fragment length    */

    if (lp->mode == 2) {    /* memory mapped */
        /* Note: The J2585B needs alignment to 32bits here!  */
        memcpy_toio(lp->mem_ptr_virt, skb->data, (skb->len + 3) & ~3);
        if (!ok_flag)
            memset_io(lp->mem_ptr_virt, 0, HP100_MIN_PACKET_SIZE - skb->len);
    } else {        /* programmed i/o */
        outsl(ioaddr + HP100_REG_DATA32, skb->data,
              (skb->len + 3) >> 2);
        if (!ok_flag)
            for (i = (skb->len + 3) & ~3; i < HP100_MIN_PACKET_SIZE; i += 4)
                hp100_outl(0, DATA32);
    }

    hp100_outb(HP100_TX_CMD | HP100_SET_LB, OPTION_MSW);    /* send packet */

    dev->stats.tx_packets++;
    dev->stats.tx_bytes += skb->len;
    hp100_ints_on();
    spin_unlock_irqrestore(&lp->lock, flags);

    dev_kfree_skb_any(skb);

#ifdef HP100_DEBUG_TX
    printk("hp100: %s: start_xmit: end\n", dev->name);
#endif

    return NETDEV_TX_OK;

drop:
    dev_kfree_skb(skb);
    return NETDEV_TX_OK;

}


/*
 * Receive Function (Non-Busmaster mode)
 * Called when an "Receive Packet" interrupt occurs, i.e. the receive
 * packet counter is non-zero.
 * For non-busmaster, this function does the whole work of transferring
 * the packet to the host memory and then up to higher layers via skb
 * and netif_rx.
 */

static void hp100_rx(struct net_device *dev)
{
    int packets, pkt_len;
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);
    u_int header;
    struct sk_buff *skb;

#ifdef DEBUG_B
    hp100_outw(0x4213, TRACE);
    printk("hp100: %s: rx\n", dev->name);
#endif

    /* First get indication of received lan packet */
    /* RX_PKT_CND indicates the number of packets which have been fully */
    /* received onto the card but have not been fully transferred of the card */
    packets = hp100_inb(RX_PKT_CNT);
#ifdef HP100_DEBUG_RX
    if (packets > 1)
        printk("hp100: %s: rx: waiting packets = %d\n", dev->name, packets);
#endif

    while (packets-- > 0) {
        /* If ADV_NXT_PKT is still set, we have to wait until the card has */
        /* really advanced to the next packet. */
        for (pkt_len = 0; pkt_len < 6000 && (hp100_inb(OPTION_MSW) & HP100_ADV_NXT_PKT); pkt_len++) {
#ifdef HP100_DEBUG_RX
            printk ("hp100: %s: rx: busy, remaining packets = %d\n", dev->name, packets);
#endif
        }

        /* First we get the header, which contains information about the */
        /* actual length of the received packet. */
        if (lp->mode == 2) {    /* memory mapped mode */
            header = readl(lp->mem_ptr_virt);
        } else      /* programmed i/o */
            header = hp100_inl(DATA32);

        pkt_len = ((header & HP100_PKT_LEN_MASK) + 3) & ~3;

#ifdef HP100_DEBUG_RX
        printk("hp100: %s: rx: new packet - length=%d, errors=0x%x, dest=0x%x\n",
                     dev->name, header & HP100_PKT_LEN_MASK,
                     (header >> 16) & 0xfff8, (header >> 16) & 7);
#endif

        /* Now we allocate the skb and transfer the data into it. */
        skb = netdev_alloc_skb(dev, pkt_len + 2);
        if (skb == NULL) {  /* Not enough memory->drop packet */
#ifdef HP100_DEBUG
            printk("hp100: %s: rx: couldn't allocate a sk_buff of size %d\n",
                         dev->name, pkt_len);
#endif
            dev->stats.rx_dropped++;
        } else {    /* skb successfully allocated */

            u_char *ptr;

            skb_reserve(skb,2);

            /* ptr to start of the sk_buff data area */
            skb_put(skb, pkt_len);
            ptr = skb->data;

            /* Now transfer the data from the card into that area */
            if (lp->mode == 2)
                memcpy_fromio(ptr, lp->mem_ptr_virt,pkt_len);
            else    /* io mapped */
                insl(ioaddr + HP100_REG_DATA32, ptr, pkt_len >> 2);

            skb->protocol = eth_type_trans(skb, dev);

#ifdef HP100_DEBUG_RX
            printk("hp100: %s: rx: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
                    dev->name, ptr[0], ptr[1], ptr[2], ptr[3],
                    ptr[4], ptr[5], ptr[6], ptr[7], ptr[8],
                    ptr[9], ptr[10], ptr[11]);
#endif
            netif_rx(skb);
            dev->stats.rx_packets++;
            dev->stats.rx_bytes += pkt_len;
        }

        /* Indicate the card that we have got the packet */
        hp100_outb(HP100_ADV_NXT_PKT | HP100_SET_LB, OPTION_MSW);

        switch (header & 0x00070000) {
        case (HP100_MULTI_ADDR_HASH << 16):
        case (HP100_MULTI_ADDR_NO_HASH << 16):
            dev->stats.multicast++;
            break;
        }
    }           /* end of while(there are packets) loop */
#ifdef HP100_DEBUG_RX
    printk("hp100_rx: %s: end\n", dev->name);
#endif
}

/*
 * Receive Function for Busmaster Mode
 */
static void hp100_rx_bm(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);
    hp100_ring_t *ptr;
    u_int header;
    int pkt_len;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4214, TRACE);
    printk("hp100: %s: rx_bm\n", dev->name);
#endif

#ifdef HP100_DEBUG
    if (0 == lp->rxrcommit) {
        printk("hp100: %s: rx_bm called although no PDLs were committed to adapter?\n", dev->name);
        return;
    } else
        /* RX_PKT_CNT states how many PDLs are currently formatted and available to
         * the cards BM engine */
    if ((hp100_inw(RX_PKT_CNT) & 0x00ff) >= lp->rxrcommit) {
        printk("hp100: %s: More packets received than committed? RX_PKT_CNT=0x%x, commit=0x%x\n",
                     dev->name, hp100_inw(RX_PKT_CNT) & 0x00ff,
                     lp->rxrcommit);
        return;
    }
#endif

    while ((lp->rxrcommit > hp100_inb(RX_PDL))) {
        /*
         * The packet was received into the pdl pointed to by lp->rxrhead (
         * the oldest pdl in the ring
         */

        /* First we get the header, which contains information about the */
        /* actual length of the received packet. */

        ptr = lp->rxrhead;

        header = *(ptr->pdl - 1);
        pkt_len = (header & HP100_PKT_LEN_MASK);

        /* Conversion to new PCI API : NOP */
        pci_unmap_single(lp->pci_dev, (dma_addr_t) ptr->pdl[3], MAX_ETHER_SIZE, PCI_DMA_FROMDEVICE);

#ifdef HP100_DEBUG_BM
        printk("hp100: %s: rx_bm: header@0x%x=0x%x length=%d, errors=0x%x, dest=0x%x\n",
                dev->name, (u_int) (ptr->pdl - 1), (u_int) header,
                pkt_len, (header >> 16) & 0xfff8, (header >> 16) & 7);
        printk("hp100: %s: RX_PDL_COUNT:0x%x TX_PDL_COUNT:0x%x, RX_PKT_CNT=0x%x PDH=0x%x, Data@0x%x len=0x%x\n",
                dev->name, hp100_inb(RX_PDL), hp100_inb(TX_PDL),
                hp100_inb(RX_PKT_CNT), (u_int) * (ptr->pdl),
                (u_int) * (ptr->pdl + 3), (u_int) * (ptr->pdl + 4));
#endif

        if ((pkt_len >= MIN_ETHER_SIZE) &&
            (pkt_len <= MAX_ETHER_SIZE)) {
            if (ptr->skb == NULL) {
                printk("hp100: %s: rx_bm: skb null\n", dev->name);
                /* can happen if we only allocated room for the pdh due to memory shortage. */
                dev->stats.rx_dropped++;
            } else {
                skb_trim(ptr->skb, pkt_len);    /* Shorten it */
                ptr->skb->protocol =
                    eth_type_trans(ptr->skb, dev);

                netif_rx(ptr->skb); /* Up and away... */

                dev->stats.rx_packets++;
                dev->stats.rx_bytes += pkt_len;
            }

            switch (header & 0x00070000) {
            case (HP100_MULTI_ADDR_HASH << 16):
            case (HP100_MULTI_ADDR_NO_HASH << 16):
                dev->stats.multicast++;
                break;
            }
        } else {
#ifdef HP100_DEBUG
            printk("hp100: %s: rx_bm: Received bad packet (length=%d)\n", dev->name, pkt_len);
#endif
            if (ptr->skb != NULL)
                dev_kfree_skb_any(ptr->skb);
            dev->stats.rx_errors++;
        }

        lp->rxrhead = lp->rxrhead->next;

        /* Allocate a new rx PDL (so lp->rxrcommit stays the same) */
        if (0 == hp100_build_rx_pdl(lp->rxrtail, dev)) {
            /* No space for skb, header can still be received. */
#ifdef HP100_DEBUG
            printk("hp100: %s: rx_bm: No space for new PDL.\n", dev->name);
#endif
            return;
        } else {    /* successfully allocated new PDL - put it in ringlist at tail. */
            hp100_outl((u32) lp->rxrtail->pdl_paddr, RX_PDA);
            lp->rxrtail = lp->rxrtail->next;
        }

    }
}

/*
 *  statistics
 */
static struct net_device_stats *hp100_get_stats(struct net_device *dev)
{
    unsigned long flags;
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4215, TRACE);
#endif

    spin_lock_irqsave(&lp->lock, flags);
    hp100_ints_off();   /* Useful ? Jean II */
    hp100_update_stats(dev);
    hp100_ints_on();
    spin_unlock_irqrestore(&lp->lock, flags);
    return &(dev->stats);
}

static void hp100_update_stats(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    u_short val;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4216, TRACE);
    printk("hp100: %s: update-stats\n", dev->name);
#endif

    /* Note: Statistics counters clear when read. */
    hp100_page(MAC_CTRL);
    val = hp100_inw(DROPPED) & 0x0fff;
    dev->stats.rx_errors += val;
    dev->stats.rx_over_errors += val;
    val = hp100_inb(CRC);
    dev->stats.rx_errors += val;
    dev->stats.rx_crc_errors += val;
    val = hp100_inb(ABORT);
    dev->stats.tx_errors += val;
    dev->stats.tx_aborted_errors += val;
    hp100_page(PERFORMANCE);
}

static void hp100_misc_interrupt(struct net_device *dev)
{
#ifdef HP100_DEBUG_B
    int ioaddr = dev->base_addr;
#endif

#ifdef HP100_DEBUG_B
    int ioaddr = dev->base_addr;
    hp100_outw(0x4216, TRACE);
    printk("hp100: %s: misc_interrupt\n", dev->name);
#endif

    /* Note: Statistics counters clear when read. */
    dev->stats.rx_errors++;
    dev->stats.tx_errors++;
}

static void hp100_clear_stats(struct hp100_private *lp, int ioaddr)
{
    unsigned long flags;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4217, TRACE);
    printk("hp100: %s: clear_stats\n", dev->name);
#endif

    spin_lock_irqsave(&lp->lock, flags);
    hp100_page(MAC_CTRL);   /* get all statistics bytes */
    hp100_inw(DROPPED);
    hp100_inb(CRC);
    hp100_inb(ABORT);
    hp100_page(PERFORMANCE);
    spin_unlock_irqrestore(&lp->lock, flags);
}


/*
 *  multicast setup
 */

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

static void hp100_set_multicast_list(struct net_device *dev)
{
    unsigned long flags;
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4218, TRACE);
    printk("hp100: %s: set_mc_list\n", dev->name);
#endif

    spin_lock_irqsave(&lp->lock, flags);
    hp100_ints_off();
    hp100_page(MAC_CTRL);
    hp100_andb(~(HP100_RX_EN | HP100_TX_EN), MAC_CFG_1);    /* stop rx/tx */

    if (dev->flags & IFF_PROMISC) {
        lp->mac2_mode = HP100_MAC2MODE6;    /* promiscuous mode = get all good */
        lp->mac1_mode = HP100_MAC1MODE6;    /* packets on the net */
        memset(&lp->hash_bytes, 0xff, 8);
    } else if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI)) {
        lp->mac2_mode = HP100_MAC2MODE5;    /* multicast mode = get packets for */
        lp->mac1_mode = HP100_MAC1MODE5;    /* me, broadcasts and all multicasts */
#ifdef HP100_MULTICAST_FILTER   /* doesn't work!!! */
        if (dev->flags & IFF_ALLMULTI) {
            /* set hash filter to receive all multicast packets */
            memset(&lp->hash_bytes, 0xff, 8);
        } else {
            int i, idx;
            u_char *addrs;
            struct netdev_hw_addr *ha;

            memset(&lp->hash_bytes, 0x00, 8);
#ifdef HP100_DEBUG
            printk("hp100: %s: computing hash filter - mc_count = %i\n",
                   dev->name, netdev_mc_count(dev));
#endif
            netdev_for_each_mc_addr(ha, dev) {
                addrs = ha->addr;
#ifdef HP100_DEBUG
                printk("hp100: %s: multicast = %pM, ",
                         dev->name, addrs);
#endif
                for (i = idx = 0; i < 6; i++) {
                    idx ^= *addrs++ & 0x3f;
                    printk(":%02x:", idx);
                }
#ifdef HP100_DEBUG
                printk("idx = %i\n", idx);
#endif
                lp->hash_bytes[idx >> 3] |= (1 << (idx & 7));
            }
        }
#else
        memset(&lp->hash_bytes, 0xff, 8);
#endif
    } else {
        lp->mac2_mode = HP100_MAC2MODE3;    /* normal mode = get packets for me */
        lp->mac1_mode = HP100_MAC1MODE3;    /* and broadcasts */
        memset(&lp->hash_bytes, 0x00, 8);
    }

    if (((hp100_inb(MAC_CFG_1) & 0x0f) != lp->mac1_mode) ||
        (hp100_inb(MAC_CFG_2) != lp->mac2_mode)) {
        int i;

        hp100_outb(lp->mac2_mode, MAC_CFG_2);
        hp100_andb(HP100_MAC1MODEMASK, MAC_CFG_1);  /* clear mac1 mode bits */
        hp100_orb(lp->mac1_mode, MAC_CFG_1);    /* and set the new mode */

        hp100_page(MAC_ADDRESS);
        for (i = 0; i < 8; i++)
            hp100_outb(lp->hash_bytes[i], HASH_BYTE0 + i);
#ifdef HP100_DEBUG
        printk("hp100: %s: mac1 = 0x%x, mac2 = 0x%x, multicast hash = %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
                     dev->name, lp->mac1_mode, lp->mac2_mode,
                     lp->hash_bytes[0], lp->hash_bytes[1],
                     lp->hash_bytes[2], lp->hash_bytes[3],
                     lp->hash_bytes[4], lp->hash_bytes[5],
                     lp->hash_bytes[6], lp->hash_bytes[7]);
#endif

        if (lp->lan_type == HP100_LAN_100) {
#ifdef HP100_DEBUG
            printk("hp100: %s: 100VG MAC settings have changed - relogin.\n", dev->name);
#endif
            lp->hub_status = hp100_login_to_vg_hub(dev, 1); /* force a relogin to the hub */
        }
    } else {
        int i;
        u_char old_hash_bytes[8];

        hp100_page(MAC_ADDRESS);
        for (i = 0; i < 8; i++)
            old_hash_bytes[i] = hp100_inb(HASH_BYTE0 + i);
        if (memcmp(old_hash_bytes, &lp->hash_bytes, 8)) {
            for (i = 0; i < 8; i++)
                hp100_outb(lp->hash_bytes[i], HASH_BYTE0 + i);
#ifdef HP100_DEBUG
            printk("hp100: %s: multicast hash = %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
                    dev->name, lp->hash_bytes[0],
                    lp->hash_bytes[1], lp->hash_bytes[2],
                    lp->hash_bytes[3], lp->hash_bytes[4],
                    lp->hash_bytes[5], lp->hash_bytes[6],
                    lp->hash_bytes[7]);
#endif

            if (lp->lan_type == HP100_LAN_100) {
#ifdef HP100_DEBUG
                printk("hp100: %s: 100VG MAC settings have changed - relogin.\n", dev->name);
#endif
                lp->hub_status = hp100_login_to_vg_hub(dev, 1); /* force a relogin to the hub */
            }
        }
    }

    hp100_page(MAC_CTRL);
    hp100_orb(HP100_RX_EN | HP100_RX_IDLE | /* enable rx */
          HP100_TX_EN | HP100_TX_IDLE, MAC_CFG_1);  /* enable tx */

    hp100_page(PERFORMANCE);
    hp100_ints_on();
    spin_unlock_irqrestore(&lp->lock, flags);
}

/*
 *  hardware interrupt handling
 */

static irqreturn_t hp100_interrupt(int irq, void *dev_id)
{
    struct net_device *dev = (struct net_device *) dev_id;
    struct hp100_private *lp = netdev_priv(dev);

    int ioaddr;
    u_int val;

    if (dev == NULL)
        return IRQ_NONE;
    ioaddr = dev->base_addr;

    spin_lock(&lp->lock);

    hp100_ints_off();

#ifdef HP100_DEBUG_B
    hp100_outw(0x4219, TRACE);
#endif

    /*  hp100_page( PERFORMANCE ); */
    val = hp100_inw(IRQ_STATUS);
#ifdef HP100_DEBUG_IRQ
    printk("hp100: %s: mode=%x,IRQ_STAT=0x%.4x,RXPKTCNT=0x%.2x RXPDL=0x%.2x TXPKTCNT=0x%.2x TXPDL=0x%.2x\n",
                 dev->name, lp->mode, (u_int) val, hp100_inb(RX_PKT_CNT),
                 hp100_inb(RX_PDL), hp100_inb(TX_PKT_CNT), hp100_inb(TX_PDL));
#endif

    if (val == 0) {     /* might be a shared interrupt */
        spin_unlock(&lp->lock);
        hp100_ints_on();
        return IRQ_NONE;
    }
    /* We're only interested in those interrupts we really enabled. */
    /* val &= hp100_inw( IRQ_MASK ); */

    /*
     * RX_PDL_FILL_COMPL is set whenever a RX_PDL has been executed. A RX_PDL
     * is considered executed whenever the RX_PDL data structure is no longer
     * needed.
     */
    if (val & HP100_RX_PDL_FILL_COMPL) {
        if (lp->mode == 1)
            hp100_rx_bm(dev);
        else {
            printk("hp100: %s: rx_pdl_fill_compl interrupt although not busmaster?\n", dev->name);
        }
    }

    /*
     * The RX_PACKET interrupt is set, when the receive packet counter is
     * non zero. We use this interrupt for receiving in slave mode. In
     * busmaster mode, we use it to make sure we did not miss any rx_pdl_fill
     * interrupts. If rx_pdl_fill_compl is not set and rx_packet is set, then
     * we somehow have missed a rx_pdl_fill_compl interrupt.
     */

    if (val & HP100_RX_PACKET) {    /* Receive Packet Counter is non zero */
        if (lp->mode != 1)  /* non busmaster */
            hp100_rx(dev);
        else if (!(val & HP100_RX_PDL_FILL_COMPL)) {
            /* Shouldn't happen - maybe we missed a RX_PDL_FILL Interrupt?  */
            hp100_rx_bm(dev);
        }
    }

    /*
     * Ack. that we have noticed the interrupt and thereby allow next one.
     * Note that this is now done after the slave rx function, since first
     * acknowledging and then setting ADV_NXT_PKT caused an extra interrupt
     * on the J2573.
     */
    hp100_outw(val, IRQ_STATUS);

    /*
     * RX_ERROR is set when a packet is dropped due to no memory resources on
     * the card or when a RCV_ERR occurs.
     * TX_ERROR is set when a TX_ABORT condition occurs in the MAC->exists
     * only in the 802.3 MAC and happens when 16 collisions occur during a TX
     */
    if (val & (HP100_TX_ERROR | HP100_RX_ERROR)) {
#ifdef HP100_DEBUG_IRQ
        printk("hp100: %s: TX/RX Error IRQ\n", dev->name);
#endif
        hp100_update_stats(dev);
        if (lp->mode == 1) {
            hp100_rxfill(dev);
            hp100_clean_txring(dev);
        }
    }

    /*
     * RX_PDA_ZERO is set when the PDA count goes from non-zero to zero.
     */
    if ((lp->mode == 1) && (val & (HP100_RX_PDA_ZERO)))
        hp100_rxfill(dev);

    /*
     * HP100_TX_COMPLETE interrupt occurs when packet transmitted on wire
     * is completed
     */
    if ((lp->mode == 1) && (val & (HP100_TX_COMPLETE)))
        hp100_clean_txring(dev);

    /*
     * MISC_ERROR is set when either the LAN link goes down or a detected
     * bus error occurs.
     */
    if (val & HP100_MISC_ERROR) {   /* New for J2585B */
#ifdef HP100_DEBUG_IRQ
        printk
            ("hp100: %s: Misc. Error Interrupt - Check cabling.\n",
             dev->name);
#endif
        if (lp->mode == 1) {
            hp100_clean_txring(dev);
            hp100_rxfill(dev);
        }
        hp100_misc_interrupt(dev);
    }

    spin_unlock(&lp->lock);
    hp100_ints_on();
    return IRQ_HANDLED;
}

/*
 *  some misc functions
 */

static void hp100_start_interface(struct net_device *dev)
{
    unsigned long flags;
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4220, TRACE);
    printk("hp100: %s: hp100_start_interface\n", dev->name);
#endif

    spin_lock_irqsave(&lp->lock, flags);

    /* Ensure the adapter does not want to request an interrupt when */
    /* enabling the IRQ line to be active on the bus (i.e. not tri-stated) */
    hp100_page(PERFORMANCE);
    hp100_outw(0xfefe, IRQ_MASK);   /* mask off all ints */
    hp100_outw(0xffff, IRQ_STATUS); /* ack all IRQs */
    hp100_outw(HP100_FAKE_INT | HP100_INT_EN | HP100_RESET_LB,
           OPTION_LSW);
    /* Un Tri-state int. TODO: Check if shared interrupts can be realised? */
    hp100_outw(HP100_TRI_INT | HP100_RESET_HB, OPTION_LSW);

    if (lp->mode == 1) {
        /* Make sure BM bit is set... */
        hp100_page(HW_MAP);
        hp100_orb(HP100_BM_MASTER, BM);
        hp100_rxfill(dev);
    } else if (lp->mode == 2) {
        /* Enable memory mapping. Note: Don't do this when busmaster. */
        hp100_outw(HP100_MMAP_DIS | HP100_RESET_HB, OPTION_LSW);
    }

    hp100_page(PERFORMANCE);
    hp100_outw(0xfefe, IRQ_MASK);   /* mask off all ints */
    hp100_outw(0xffff, IRQ_STATUS); /* ack IRQ */

    /* enable a few interrupts: */
    if (lp->mode == 1) {    /* busmaster mode */
        hp100_outw(HP100_RX_PDL_FILL_COMPL |
               HP100_RX_PDA_ZERO | HP100_RX_ERROR |
               /* HP100_RX_PACKET    | */
               /* HP100_RX_EARLY_INT |  */ HP100_SET_HB |
               /* HP100_TX_PDA_ZERO  |  */
               HP100_TX_COMPLETE |
               /* HP100_MISC_ERROR   |  */
               HP100_TX_ERROR | HP100_SET_LB, IRQ_MASK);
    } else {
        hp100_outw(HP100_RX_PACKET |
               HP100_RX_ERROR | HP100_SET_HB |
               HP100_TX_ERROR | HP100_SET_LB, IRQ_MASK);
    }

    /* Note : before hp100_set_multicast_list(), because it will play with
     * spinlock itself... Jean II */
    spin_unlock_irqrestore(&lp->lock, flags);

    /* Enable MAC Tx and RX, set MAC modes, ... */
    hp100_set_multicast_list(dev);
}

static void hp100_stop_interface(struct net_device *dev)
{
    struct hp100_private *lp = netdev_priv(dev);
    int ioaddr = dev->base_addr;
    u_int val;

#ifdef HP100_DEBUG_B
    printk("hp100: %s: hp100_stop_interface\n", dev->name);
    hp100_outw(0x4221, TRACE);
#endif

    if (lp->mode == 1)
        hp100_BM_shutdown(dev);
    else {
        /* Note: MMAP_DIS will be reenabled by start_interface */
        hp100_outw(HP100_INT_EN | HP100_RESET_LB |
               HP100_TRI_INT | HP100_MMAP_DIS | HP100_SET_HB,
               OPTION_LSW);
        val = hp100_inw(OPTION_LSW);

        hp100_page(MAC_CTRL);
        hp100_andb(~(HP100_RX_EN | HP100_TX_EN), MAC_CFG_1);

        if (!(val & HP100_HW_RST))
            return; /* If reset, imm. return ... */
        /* ... else: busy wait until idle */
        for (val = 0; val < 6000; val++)
            if ((hp100_inb(MAC_CFG_1) & (HP100_TX_IDLE | HP100_RX_IDLE)) == (HP100_TX_IDLE | HP100_RX_IDLE)) {
                hp100_page(PERFORMANCE);
                return;
            }
        printk("hp100: %s: hp100_stop_interface - timeout\n", dev->name);
        hp100_page(PERFORMANCE);
    }
}

static void hp100_load_eeprom(struct net_device *dev, u_short probe_ioaddr)
{
    int i;
    int ioaddr = probe_ioaddr > 0 ? probe_ioaddr : dev->base_addr;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4222, TRACE);
#endif

    hp100_page(EEPROM_CTRL);
    hp100_andw(~HP100_EEPROM_LOAD, EEPROM_CTRL);
    hp100_orw(HP100_EEPROM_LOAD, EEPROM_CTRL);
    for (i = 0; i < 10000; i++)
        if (!(hp100_inb(OPTION_MSW) & HP100_EE_LOAD))
            return;
    printk("hp100: %s: hp100_load_eeprom - timeout\n", dev->name);
}

/*  Sense connection status.
 *  return values: LAN_10  - Connected to 10Mbit/s network
 *                 LAN_100 - Connected to 100Mbit/s network
 *                 LAN_ERR - not connected or 100Mbit/s Hub down
 */
static int hp100_sense_lan(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    u_short val_VG, val_10;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4223, TRACE);
#endif

    hp100_page(MAC_CTRL);
    val_10 = hp100_inb(10_LAN_CFG_1);
    val_VG = hp100_inb(VG_LAN_CFG_1);
    hp100_page(PERFORMANCE);
#ifdef HP100_DEBUG
    printk("hp100: %s: sense_lan: val_VG = 0x%04x, val_10 = 0x%04x\n",
           dev->name, val_VG, val_10);
#endif

    if (val_10 & HP100_LINK_BEAT_ST)    /* 10Mb connection is active */
        return HP100_LAN_10;

    if (val_10 & HP100_AUI_ST) {    /* have we BNC or AUI onboard? */
        /*
         * This can be overriden by dos utility, so if this has no effect,
         * perhaps you need to download that utility from HP and set card
         * back to "auto detect".
         */
        val_10 |= HP100_AUI_SEL | HP100_LOW_TH;
        hp100_page(MAC_CTRL);
        hp100_outb(val_10, 10_LAN_CFG_1);
        hp100_page(PERFORMANCE);
        return HP100_LAN_COAX;
    }

    /* Those cards don't have a 100 Mbit connector */
    if ( !strcmp(lp->id, "HWP1920")  ||
         (lp->pci_dev &&
          lp->pci_dev->vendor == PCI_VENDOR_ID &&
          (lp->pci_dev->device == PCI_DEVICE_ID_HP_J2970A ||
           lp->pci_dev->device == PCI_DEVICE_ID_HP_J2973A)))
        return HP100_LAN_ERR;

    if (val_VG & HP100_LINK_CABLE_ST)   /* Can hear the HUBs tone. */
        return HP100_LAN_100;
    return HP100_LAN_ERR;
}

static int hp100_down_vg_link(struct net_device *dev)
{
    struct hp100_private *lp = netdev_priv(dev);
    int ioaddr = dev->base_addr;
    unsigned long time;
    long savelan, newlan;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4224, TRACE);
    printk("hp100: %s: down_vg_link\n", dev->name);
#endif

    hp100_page(MAC_CTRL);
    time = jiffies + (HZ / 4);
    do {
        if (hp100_inb(VG_LAN_CFG_1) & HP100_LINK_CABLE_ST)
            break;
        if (!in_interrupt())
            schedule_timeout_interruptible(1);
    } while (time_after(time, jiffies));

    if (time_after_eq(jiffies, time))   /* no signal->no logout */
        return 0;

    /* Drop the VG Link by clearing the link up cmd and load addr. */

    hp100_andb(~(HP100_LOAD_ADDR | HP100_LINK_CMD), VG_LAN_CFG_1);
    hp100_orb(HP100_VG_SEL, VG_LAN_CFG_1);

    /* Conditionally stall for >250ms on Link-Up Status (to go down) */
    time = jiffies + (HZ / 2);
    do {
        if (!(hp100_inb(VG_LAN_CFG_1) & HP100_LINK_UP_ST))
            break;
        if (!in_interrupt())
            schedule_timeout_interruptible(1);
    } while (time_after(time, jiffies));

#ifdef HP100_DEBUG
    if (time_after_eq(jiffies, time))
        printk("hp100: %s: down_vg_link: Link does not go down?\n", dev->name);
#endif

    /* To prevent condition where Rev 1 VG MAC and old hubs do not complete */
    /* logout under traffic (even though all the status bits are cleared),  */
    /* do this workaround to get the Rev 1 MAC in its idle state */
    if (lp->chip == HP100_CHIPID_LASSEN) {
        /* Reset VG MAC to insure it leaves the logoff state even if */
        /* the Hub is still emitting tones */
        hp100_andb(~HP100_VG_RESET, VG_LAN_CFG_1);
        udelay(1500);   /* wait for >1ms */
        hp100_orb(HP100_VG_RESET, VG_LAN_CFG_1);    /* Release Reset */
        udelay(1500);
    }

    /* New: For lassen, switch to 10 Mbps mac briefly to clear training ACK */
    /* to get the VG mac to full reset. This is not req.d with later chips */
    /* Note: It will take the between 1 and 2 seconds for the VG mac to be */
    /* selected again! This will be left to the connect hub function to */
    /* perform if desired.  */
    if (lp->chip == HP100_CHIPID_LASSEN) {
        /* Have to write to 10 and 100VG control registers simultaneously */
        savelan = newlan = hp100_inl(10_LAN_CFG_1); /* read 10+100 LAN_CFG regs */
        newlan &= ~(HP100_VG_SEL << 16);
        newlan |= (HP100_DOT3_MAC) << 8;
        hp100_andb(~HP100_AUTO_MODE, MAC_CFG_3);    /* Autosel off */
        hp100_outl(newlan, 10_LAN_CFG_1);

        /* Conditionally stall for 5sec on VG selected. */
        time = jiffies + (HZ * 5);
        do {
            if (!(hp100_inb(MAC_CFG_4) & HP100_MAC_SEL_ST))
                break;
            if (!in_interrupt())
                schedule_timeout_interruptible(1);
        } while (time_after(time, jiffies));

        hp100_orb(HP100_AUTO_MODE, MAC_CFG_3);  /* Autosel back on */
        hp100_outl(savelan, 10_LAN_CFG_1);
    }

    time = jiffies + (3 * HZ);  /* Timeout 3s */
    do {
        if ((hp100_inb(VG_LAN_CFG_1) & HP100_LINK_CABLE_ST) == 0)
            break;
        if (!in_interrupt())
            schedule_timeout_interruptible(1);
    } while (time_after(time, jiffies));

    if (time_before_eq(time, jiffies)) {
#ifdef HP100_DEBUG
        printk("hp100: %s: down_vg_link: timeout\n", dev->name);
#endif
        return -EIO;
    }

    time = jiffies + (2 * HZ);  /* This seems to take a while.... */
    do {
        if (!in_interrupt())
            schedule_timeout_interruptible(1);
    } while (time_after(time, jiffies));

    return 0;
}

static int hp100_login_to_vg_hub(struct net_device *dev, u_short force_relogin)
{
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);
    u_short val = 0;
    unsigned long time;
    int startst;

#ifdef HP100_DEBUG_B
    hp100_outw(0x4225, TRACE);
    printk("hp100: %s: login_to_vg_hub\n", dev->name);
#endif

    /* Initiate a login sequence iff VG MAC is enabled and either Load Address
     * bit is zero or the force relogin flag is set (e.g. due to MAC address or
     * promiscuous mode change)
     */
    hp100_page(MAC_CTRL);
    startst = hp100_inb(VG_LAN_CFG_1);
    if ((force_relogin == 1) || (hp100_inb(MAC_CFG_4) & HP100_MAC_SEL_ST)) {
#ifdef HP100_DEBUG_TRAINING
        printk("hp100: %s: Start training\n", dev->name);
#endif

        /* Ensure VG Reset bit is 1 (i.e., do not reset) */
        hp100_orb(HP100_VG_RESET, VG_LAN_CFG_1);

        /* If Lassen AND auto-select-mode AND VG tones were sensed on */
        /* entry then temporarily put them into force 100Mbit mode */
        if ((lp->chip == HP100_CHIPID_LASSEN) && (startst & HP100_LINK_CABLE_ST))
            hp100_andb(~HP100_DOT3_MAC, 10_LAN_CFG_2);

        /* Drop the VG link by zeroing Link Up Command and Load Address  */
        hp100_andb(~(HP100_LINK_CMD /* |HP100_LOAD_ADDR */ ), VG_LAN_CFG_1);

#ifdef HP100_DEBUG_TRAINING
        printk("hp100: %s: Bring down the link\n", dev->name);
#endif

        /* Wait for link to drop */
        time = jiffies + (HZ / 10);
        do {
            if (~(hp100_inb(VG_LAN_CFG_1) & HP100_LINK_UP_ST))
                break;
            if (!in_interrupt())
                schedule_timeout_interruptible(1);
        } while (time_after(time, jiffies));

        /* Start an addressed training and optionally request promiscuous port */
        if ((dev->flags) & IFF_PROMISC) {
            hp100_orb(HP100_PROM_MODE, VG_LAN_CFG_2);
            if (lp->chip == HP100_CHIPID_LASSEN)
                hp100_orw(HP100_MACRQ_PROMSC, TRAIN_REQUEST);
        } else {
            hp100_andb(~HP100_PROM_MODE, VG_LAN_CFG_2);
            /* For ETR parts we need to reset the prom. bit in the training
             * register, otherwise promiscious mode won't be disabled.
             */
            if (lp->chip == HP100_CHIPID_LASSEN) {
                hp100_andw(~HP100_MACRQ_PROMSC, TRAIN_REQUEST);
            }
        }

        /* With ETR parts, frame format request bits can be set. */
        if (lp->chip == HP100_CHIPID_LASSEN)
            hp100_orb(HP100_MACRQ_FRAMEFMT_EITHER, TRAIN_REQUEST);

        hp100_orb(HP100_LINK_CMD | HP100_LOAD_ADDR | HP100_VG_RESET, VG_LAN_CFG_1);

        /* Note: Next wait could be omitted for Hood and earlier chips under */
        /* certain circumstances */
        /* TODO: check if hood/earlier and skip wait. */

        /* Wait for either short timeout for VG tones or long for login    */
        /* Wait for the card hardware to signalise link cable status ok... */
        hp100_page(MAC_CTRL);
        time = jiffies + (1 * HZ);  /* 1 sec timeout for cable st */
        do {
            if (hp100_inb(VG_LAN_CFG_1) & HP100_LINK_CABLE_ST)
                break;
            if (!in_interrupt())
                schedule_timeout_interruptible(1);
        } while (time_before(jiffies, time));

        if (time_after_eq(jiffies, time)) {
#ifdef HP100_DEBUG_TRAINING
            printk("hp100: %s: Link cable status not ok? Training aborted.\n", dev->name);
#endif
        } else {
#ifdef HP100_DEBUG_TRAINING
            printk
                ("hp100: %s: HUB tones detected. Trying to train.\n",
                 dev->name);
#endif

            time = jiffies + (2 * HZ);  /* again a timeout */
            do {
                val = hp100_inb(VG_LAN_CFG_1);
                if ((val & (HP100_LINK_UP_ST))) {
#ifdef HP100_DEBUG_TRAINING
                    printk("hp100: %s: Passed training.\n", dev->name);
#endif
                    break;
                }
                if (!in_interrupt())
                    schedule_timeout_interruptible(1);
            } while (time_after(time, jiffies));
        }

        /* If LINK_UP_ST is set, then we are logged into the hub. */
        if (time_before_eq(jiffies, time) && (val & HP100_LINK_UP_ST)) {
#ifdef HP100_DEBUG_TRAINING
            printk("hp100: %s: Successfully logged into the HUB.\n", dev->name);
            if (lp->chip == HP100_CHIPID_LASSEN) {
                val = hp100_inw(TRAIN_ALLOW);
                printk("hp100: %s: Card supports 100VG MAC Version \"%s\" ",
                         dev->name, (hp100_inw(TRAIN_REQUEST) & HP100_CARD_MACVER) ? "802.12" : "Pre");
                printk("Driver will use MAC Version \"%s\"\n", (val & HP100_HUB_MACVER) ? "802.12" : "Pre");
                printk("hp100: %s: Frame format is %s.\n", dev->name, (val & HP100_MALLOW_FRAMEFMT) ? "802.5" : "802.3");
            }
#endif
        } else {
            /* If LINK_UP_ST is not set, login was not successful */
            printk("hp100: %s: Problem logging into the HUB.\n", dev->name);
            if (lp->chip == HP100_CHIPID_LASSEN) {
                /* Check allowed Register to find out why there is a problem. */
                val = hp100_inw(TRAIN_ALLOW);   /* won't work on non-ETR card */
#ifdef HP100_DEBUG_TRAINING
                printk("hp100: %s: MAC Configuration requested: 0x%04x, HUB allowed: 0x%04x\n", dev->name, hp100_inw(TRAIN_REQUEST), val);
#endif
                if (val & HP100_MALLOW_ACCDENIED)
                    printk("hp100: %s: HUB access denied.\n", dev->name);
                if (val & HP100_MALLOW_CONFIGURE)
                    printk("hp100: %s: MAC Configuration is incompatible with the Network.\n", dev->name);
                if (val & HP100_MALLOW_DUPADDR)
                    printk("hp100: %s: Duplicate MAC Address on the Network.\n", dev->name);
            }
        }

        /* If we have put the chip into forced 100 Mbit mode earlier, go back */
        /* to auto-select mode */

        if ((lp->chip == HP100_CHIPID_LASSEN) && (startst & HP100_LINK_CABLE_ST)) {
            hp100_page(MAC_CTRL);
            hp100_orb(HP100_DOT3_MAC, 10_LAN_CFG_2);
        }

        val = hp100_inb(VG_LAN_CFG_1);

        /* Clear the MISC_ERROR Interrupt, which might be generated when doing the relogin */
        hp100_page(PERFORMANCE);
        hp100_outw(HP100_MISC_ERROR, IRQ_STATUS);

        if (val & HP100_LINK_UP_ST)
            return 0;   /* login was ok */
        else {
            printk("hp100: %s: Training failed.\n", dev->name);
            hp100_down_vg_link(dev);
            return -EIO;
        }
    }
    /* no forced relogin & already link there->no training. */
    return -EIO;
}

static void hp100_cascade_reset(struct net_device *dev, u_short enable)
{
    int ioaddr = dev->base_addr;
    struct hp100_private *lp = netdev_priv(dev);

#ifdef HP100_DEBUG_B
    hp100_outw(0x4226, TRACE);
    printk("hp100: %s: cascade_reset\n", dev->name);
#endif

    if (enable) {
        hp100_outw(HP100_HW_RST | HP100_RESET_LB, OPTION_LSW);
        if (lp->chip == HP100_CHIPID_LASSEN) {
            /* Lassen requires a PCI transmit fifo reset */
            hp100_page(HW_MAP);
            hp100_andb(~HP100_PCI_RESET, PCICTRL2);
            hp100_orb(HP100_PCI_RESET, PCICTRL2);
            /* Wait for min. 300 ns */
            /* we can't use jiffies here, because it may be */
            /* that we have disabled the timer... */
            udelay(400);
            hp100_andb(~HP100_PCI_RESET, PCICTRL2);
            hp100_page(PERFORMANCE);
        }
    } else {        /* bring out of reset */
        hp100_outw(HP100_HW_RST | HP100_SET_LB, OPTION_LSW);
        udelay(400);
        hp100_page(PERFORMANCE);
    }
}

#ifdef HP100_DEBUG
void hp100_RegisterDump(struct net_device *dev)
{
    int ioaddr = dev->base_addr;
    int Page;
    int Register;

    /* Dump common registers */
    printk("hp100: %s: Cascade Register Dump\n", dev->name);
    printk("hardware id #1: 0x%.2x\n", hp100_inb(HW_ID));
    printk("hardware id #2/paging: 0x%.2x\n", hp100_inb(PAGING));
    printk("option #1: 0x%.4x\n", hp100_inw(OPTION_LSW));
    printk("option #2: 0x%.4x\n", hp100_inw(OPTION_MSW));

    /* Dump paged registers */
    for (Page = 0; Page < 8; Page++) {
        /* Dump registers */
        printk("page: 0x%.2x\n", Page);
        outw(Page, ioaddr + 0x02);
        for (Register = 0x8; Register < 0x22; Register += 2) {
            /* Display Register contents except data port */
            if (((Register != 0x10) && (Register != 0x12)) || (Page > 0)) {
                printk("0x%.2x = 0x%.4x\n", Register, inw(ioaddr + Register));
            }
        }
    }
    hp100_page(PERFORMANCE);
}
#endif


static void cleanup_dev(struct net_device *d)
{
    struct hp100_private *p = netdev_priv(d);

    unregister_netdev(d);
    release_region(d->base_addr, HP100_REGION_SIZE);

    if (p->mode == 1)   /* busmaster */
        pci_free_consistent(p->pci_dev, MAX_RINGSIZE + 0x0f,
                    p->page_vaddr_algn,
                    virt_to_whatever(d, p->page_vaddr_algn));
    if (p->mem_ptr_virt)
        iounmap(p->mem_ptr_virt);

    free_netdev(d);
}

#ifdef CONFIG_EISA
static int __init hp100_eisa_probe (struct device *gendev)
{
    struct net_device *dev = alloc_etherdev(sizeof(struct hp100_private));
    struct eisa_device *edev = to_eisa_device(gendev);
    int err;

    if (!dev)
        return -ENOMEM;

    SET_NETDEV_DEV(dev, &edev->dev);

    err = hp100_probe1(dev, edev->base_addr + 0xC38, HP100_BUS_EISA, NULL);
    if (err)
        goto out1;

#ifdef HP100_DEBUG
    printk("hp100: %s: EISA adapter found at 0x%x\n", dev->name,
           dev->base_addr);
#endif
    dev_set_drvdata(gendev, dev);
    return 0;
 out1:
    free_netdev(dev);
    return err;
}

static int __devexit hp100_eisa_remove (struct device *gendev)
{
    struct net_device *dev = dev_get_drvdata(gendev);
    cleanup_dev(dev);
    return 0;
}

static struct eisa_driver hp100_eisa_driver = {
        .id_table = hp100_eisa_tbl,
        .driver   = {
                .name    = "hp100",
                .probe   = hp100_eisa_probe,
                .remove  = __devexit_p (hp100_eisa_remove),
        }
};
#endif

#ifdef CONFIG_PCI
static int __devinit hp100_pci_probe (struct pci_dev *pdev,
                     const struct pci_device_id *ent)
{
    struct net_device *dev;
    int ioaddr;
    u_short pci_command;
    int err;

    if (pci_enable_device(pdev))
        return -ENODEV;

    dev = alloc_etherdev(sizeof(struct hp100_private));
    if (!dev) {
        err = -ENOMEM;
        goto out0;
    }

    SET_NETDEV_DEV(dev, &pdev->dev);

    pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
    if (!(pci_command & PCI_COMMAND_IO)) {
#ifdef HP100_DEBUG
        printk("hp100: %s: PCI I/O Bit has not been set. Setting...\n", dev->name);
#endif
        pci_command |= PCI_COMMAND_IO;
        pci_write_config_word(pdev, PCI_COMMAND, pci_command);
    }

    if (!(pci_command & PCI_COMMAND_MASTER)) {
#ifdef HP100_DEBUG
        printk("hp100: %s: PCI Master Bit has not been set. Setting...\n", dev->name);
#endif
        pci_command |= PCI_COMMAND_MASTER;
        pci_write_config_word(pdev, PCI_COMMAND, pci_command);
    }

    ioaddr = pci_resource_start(pdev, 0);
    err = hp100_probe1(dev, ioaddr, HP100_BUS_PCI, pdev);
    if (err)
        goto out1;

#ifdef HP100_DEBUG
    printk("hp100: %s: PCI adapter found at 0x%x\n", dev->name, ioaddr);
#endif
    pci_set_drvdata(pdev, dev);
    return 0;
 out1:
    free_netdev(dev);
 out0:
    pci_disable_device(pdev);
    return err;
}

static void __devexit hp100_pci_remove (struct pci_dev *pdev)
{
    struct net_device *dev = pci_get_drvdata(pdev);

    cleanup_dev(dev);
    pci_disable_device(pdev);
}


static struct pci_driver hp100_pci_driver = {
    .name       = "hp100",
    .id_table   = hp100_pci_tbl,
    .probe      = hp100_pci_probe,
    .remove     = __devexit_p(hp100_pci_remove),
};
#endif

/*
 *  module section
 */

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jaroslav Kysela <[email protected]>, "
              "Siegfried \"Frieder\" Loeffler (dg1sek) <[email protected]>");
MODULE_DESCRIPTION("HP CASCADE Architecture Driver for 100VG-AnyLan Network Adapters");

/*
 * Note: to register three isa devices, use:
 * option hp100 hp100_port=0,0,0
 *        to register one card at io 0x280 as eth239, use:
 * option hp100 hp100_port=0x280
 */
#if defined(MODULE) && defined(CONFIG_ISA)
#define HP100_DEVICES 5
/* Parameters set by insmod */
static int hp100_port[HP100_DEVICES] = { 0, [1 ... (HP100_DEVICES-1)] = -1 };
module_param_array(hp100_port, int, NULL, 0);

/* List of devices */
static struct net_device *hp100_devlist[HP100_DEVICES];

static int __init hp100_isa_init(void)
{
    struct net_device *dev;
    int i, err, cards = 0;

    /* Don't autoprobe ISA bus */
    if (hp100_port[0] == 0)
        return -ENODEV;

    /* Loop on all possible base addresses */
    for (i = 0; i < HP100_DEVICES && hp100_port[i] != -1; ++i) {
        dev = alloc_etherdev(sizeof(struct hp100_private));
        if (!dev) {
            while (cards > 0)
                cleanup_dev(hp100_devlist[--cards]);

            return -ENOMEM;
        }

        err = hp100_isa_probe(dev, hp100_port[i]);
        if (!err)
            hp100_devlist[cards++] = dev;
        else
            free_netdev(dev);
    }

    return cards > 0 ? 0 : -ENODEV;
}

static void hp100_isa_cleanup(void)
{
    int i;

    for (i = 0; i < HP100_DEVICES; i++) {
        struct net_device *dev = hp100_devlist[i];
        if (dev)
            cleanup_dev(dev);
    }
}
#else
#define hp100_isa_init()    (0)
#define hp100_isa_cleanup() do { } while(0)
#endif

static int __init hp100_module_init(void)
{
    int err;

    err = hp100_isa_init();
    if (err && err != -ENODEV)
        goto out;
#ifdef CONFIG_EISA
    err = eisa_driver_register(&hp100_eisa_driver);
    if (err && err != -ENODEV)
        goto out2;
#endif
#ifdef CONFIG_PCI
    err = pci_register_driver(&hp100_pci_driver);
    if (err && err != -ENODEV)
        goto out3;
#endif
 out:
    return err;
 out3:
#ifdef CONFIG_EISA
    eisa_driver_unregister (&hp100_eisa_driver);
 out2:
#endif
    hp100_isa_cleanup();
    goto out;
}


static void __exit hp100_module_exit(void)
{
    hp100_isa_cleanup();
#ifdef CONFIG_EISA
    eisa_driver_unregister (&hp100_eisa_driver);
#endif
#ifdef CONFIG_PCI
    pci_unregister_driver (&hp100_pci_driver);
#endif
}

module_init(hp100_module_init)
module_exit(hp100_module_exit)