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hp100.c

/*
** 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 <perex@jcu.cz>
** Extended for new busmaster capable chipsets by 
** Siegfried "Frieder" Loeffler (dg1sek) <floeff@mathematik.uni-stuttgart.de>
**
** Maintained by: Jaroslav Kysela <perex@suse.cz>
** 
** 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 <acme@conectiva.com.br>
**   - 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/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.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/config.h>     /* for CONFIG_PCI */
#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];
      struct net_device_stats stats;

      /* 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 commited to adapter */
      int txrcommit;          /* # Tx PDLs commited to adapter */
};

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

#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 struct pci_device_id 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 int hp100_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int 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, struct pt_regs *regs);
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;
}

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;
}


#ifndef MODULE
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);

      SET_MODULE_OWNER(dev);

#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

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_32BIT_MASK))) {
                        /* 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 */

      dev->open = hp100_open;
      dev->stop = hp100_close;

      if (lp->mode == 1)      /* busmaster */
            dev->hard_start_xmit = hp100_start_xmit_bm;
      else
            dev->hard_start_xmit = hp100_start_xmit;

      dev->get_stats = hp100_get_stats;
      dev->set_multicast_list = &hp100_set_multicast_list;

      /* 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 continous 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 */
            if ((lp->page_vaddr_algn = pci_alloc_consistent(lp->pci_dev, MAX_RINGSIZE, &page_baddr)) == NULL) {
                  err = -ENOMEM;
                  goto out2;
            }
            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));
      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 initalize 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;
      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 (0 == 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 = (void *) 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 ((((MAX_RX_FRAG * 2 + 2) + 3) / 4) * 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 = (void *) NULL;

      return ((((MAX_TX_FRAG * 2 + 2) + 3) / 4) * 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 = dev_alloc_skb(((MAX_ETHER_SIZE + 2 + 3) / 4) * 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->dev = dev;
            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,
                             ((MAX_ETHER_SIZE + 2 + 3) / 4) * 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 int 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 == NULL) {
            return 0;
      }

      if (skb->len <= 0)
            return 0;
            
      if (lp->chip == HP100_CHIPID_SHASTA && skb_padto(skb, ETH_ZLEN))
            return 0;

      /* 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 + HZ))
                  return -EAGAIN;

            if (hp100_check_lan(dev))
                  return -EIO;

            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);
                  }
            }

            dev->trans_start = jiffies;
            return -EAGAIN;
      }

      /*
       * 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++;
      spin_unlock_irqrestore(&lp->lock, flags);

      /* Update statistics */
      lp->stats.tx_packets++;
      lp->stats.tx_bytes += skb->len;
      dev->trans_start = jiffies;

      return 0;
}


/* 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 commited 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 commited 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 = (void *) NULL;
            lp->txrhead = lp->txrhead->next;
            lp->txrcommit--;
      }
}

/* tx function for slave modes */
static int 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 == NULL) {
            return 0;
      }

      if (skb->len <= 0)
            return 0;

      if (hp100_check_lan(dev))
            return -EIO;

      /* 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 + HZ)) {
#ifdef HP100_DEBUG
                  printk("hp100: %s: trans_start timing problem\n",
                         dev->name);
#endif
                  return -EAGAIN;
            }
            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);
                  }
            }
            dev->trans_start = jiffies;
            return -EAGAIN;
      }

      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 */

      lp->stats.tx_packets++;
      lp->stats.tx_bytes += skb->len;
      dev->trans_start = jiffies;
      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 0;
}


/*
 * 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 transfering
 * 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 = dev_alloc_skb(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
                  lp->stats.rx_dropped++;
            } else {    /* skb successfully allocated */

                  u_char *ptr;

                  skb_reserve(skb,2);
                  skb->dev = dev;

                  /* 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->last_rx = jiffies;
                  lp->stats.rx_packets++;
                  lp->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):
                  lp->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 commited? 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. */
                        lp->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->last_rx = jiffies;
                        lp->stats.rx_packets++;
                        lp->stats.rx_bytes += pkt_len;
                  }

                  switch (header & 0x00070000) {
                  case (HP100_MULTI_ADDR_HASH << 16):
                  case (HP100_MULTI_ADDR_NO_HASH << 16):
                        lp->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);
                  lp->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 &(lp->stats);
}

static void hp100_update_stats(struct net_device *dev)
{
      int ioaddr = dev->base_addr;
      u_short val;
      struct hp100_private *lp = netdev_priv(dev);

#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;
      lp->stats.rx_errors += val;
      lp->stats.rx_over_errors += val;
      val = hp100_inb(CRC);
      lp->stats.rx_errors += val;
      lp->stats.rx_crc_errors += val;
      val = hp100_inb(ABORT);
      lp->stats.tx_errors += val;
      lp->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
      struct hp100_private *lp = netdev_priv(dev);

#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. */
      lp->stats.rx_errors++;
      lp->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 (dev->mc_count || (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, j, idx;
                  u_char *addrs;
                  struct dev_mc_list *dmi;

                  memset(&lp->hash_bytes, 0x00, 8);
#ifdef HP100_DEBUG
                  printk("hp100: %s: computing hash filter - mc_count = %i\n", dev->name, dev->mc_count);
#endif
                  for (i = 0, dmi = dev->mc_list; i < dev->mc_count; i++, dmi = dmi->next) {
                        addrs = dmi->dmi_addr;
                        if ((*addrs & 0x01) == 0x01) {      /* multicast address? */
#ifdef HP100_DEBUG
                              printk("hp100: %s: multicast = %02x:%02x:%02x:%02x:%02x:%02x, ",
                                         dev->name, addrs[0], addrs[1], addrs[2],
                                         addrs[3], addrs[4], addrs[5]);
#endif
                              for (j = idx = 0; j < 6; j++) {
                                    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 pt_regs *regs)
{
      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)) {
                  /* Shouldnt 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_MODULE_OWNER(dev);
      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
      gendev->driver_data = dev;
      return 0;
 out1:
      free_netdev(dev);
      return err;
}

static int __devexit hp100_eisa_remove (struct device *gendev)
{
      struct net_device *dev = gendev->driver_data;
      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_MODULE_OWNER(dev);
      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 <perex@suse.cz>, "
              "Siegfried \"Frieder\" Loeffler (dg1sek) <floeff@mathematik.uni-stuttgart.de>");
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) {
                  printk(KERN_WARNING "hp100: no memory for network device\n");
                  while (cards > 0)
                        cleanup_dev(hp100_devlist[--cards]);

                  return -ENOMEM;
            }
            SET_MODULE_OWNER(dev);

            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 __exit 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_module_init(&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)


/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c hp100.c"
 *  c-indent-level: 2
 *  tab-width: 8
 * End:
 */

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