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3c359.c

/*
 *   3c359.c (c) 2000 Mike Phillips (mikep@linuxtr.net) All Rights Reserved
 *
 *  Linux driver for 3Com 3c359 Tokenlink Velocity XL PCI NIC
 *
 *  Base Driver Olympic:
 *    Written 1999 Peter De Schrijver & Mike Phillips
 *
 *  This software may be used and distributed according to the terms
 *  of the GNU General Public License, incorporated herein by reference.
 * 
 *  7/17/00 - Clean up, version number 0.9.0. Ready to release to the world.
 *
 *  2/16/01 - Port up to kernel 2.4.2 ready for submission into the kernel.
 *  3/05/01 - Last clean up stuff before submission.
 *  2/15/01 - Finally, update to new pci api. 
 *
 *  To Do:
 */

/* 
 *    Technical Card Details
 *
 *  All access to data is done with 16/8 bit transfers.  The transfer
 *  method really sucks. You can only read or write one location at a time.
 *
 *  Also, the microcode for the card must be uploaded if the card does not have
 *  the flashrom on board.  This is a 28K bloat in the driver when compiled
 *  as a module.
 *
 *  Rx is very simple, status into a ring of descriptors, dma data transfer,
 *  interrupts to tell us when a packet is received.
 *
 *  Tx is a little more interesting. Similar scenario, descriptor and dma data
 *  transfers, but we don't have to interrupt the card to tell it another packet
 *  is ready for transmission, we are just doing simple memory writes, not io or mmio
 *  writes.  The card can be set up to simply poll on the next
 *  descriptor pointer and when this value is non-zero will automatically download
 *  the next packet.  The card then interrupts us when the packet is done.
 *
 */

#define XL_DEBUG 0

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/in.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/proc_fs.h>
#include <linux/ptrace.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/trdevice.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>

#include <net/checksum.h>

#include <asm/io.h>
#include <asm/system.h>

#include "3c359.h"

static char version[] __devinitdata  = 
"3c359.c v1.2.0 2/17/01 - Mike Phillips (mikep@linuxtr.net)" ; 

MODULE_AUTHOR("Mike Phillips <mikep@linuxtr.net>") ; 
MODULE_DESCRIPTION("3Com 3C359 Velocity XL Token Ring Adapter Driver \n") ;

/* Module paramters */

/* Ring Speed 0,4,16 
 * 0 = Autosense   
 * 4,16 = Selected speed only, no autosense
 * This allows the card to be the first on the ring
 * and become the active monitor.
 *
 * WARNING: Some hubs will allow you to insert
 * at the wrong speed.
 * 
 * The adapter will _not_ fail to open if there are no
 * active monitors on the ring, it will simply open up in 
 * its last known ringspeed if no ringspeed is specified.
 */

static int ringspeed[XL_MAX_ADAPTERS] = {0,} ;

module_param_array(ringspeed, int, NULL, 0);
MODULE_PARM_DESC(ringspeed,"3c359: Ringspeed selection - 4,16 or 0") ; 

/* Packet buffer size */

static int pkt_buf_sz[XL_MAX_ADAPTERS] = {0,} ;
 
module_param_array(pkt_buf_sz, int, NULL, 0) ;
MODULE_PARM_DESC(pkt_buf_sz,"3c359: Initial buffer size") ; 
/* Message Level */

static int message_level[XL_MAX_ADAPTERS] = {0,} ; 

module_param_array(message_level, int, NULL, 0) ;
MODULE_PARM_DESC(message_level, "3c359: Level of reported messages \n") ; 
/* 
 *    This is a real nasty way of doing this, but otherwise you
 *    will be stuck with 1555 lines of hex #'s in the code.
 */

#include "3c359_microcode.h" 

static struct pci_device_id xl_pci_tbl[] =
{
      {PCI_VENDOR_ID_3COM,PCI_DEVICE_ID_3COM_3C359, PCI_ANY_ID, PCI_ANY_ID, },
      { }               /* terminate list */
};
MODULE_DEVICE_TABLE(pci,xl_pci_tbl) ; 

static int xl_init(struct net_device *dev);
static int xl_open(struct net_device *dev);
static int xl_open_hw(struct net_device *dev) ;  
static int xl_hw_reset(struct net_device *dev); 
static int xl_xmit(struct sk_buff *skb, struct net_device *dev);
static void xl_dn_comp(struct net_device *dev); 
static int xl_close(struct net_device *dev);
static void xl_set_rx_mode(struct net_device *dev);
static irqreturn_t xl_interrupt(int irq, void *dev_id);
static struct net_device_stats * xl_get_stats(struct net_device *dev);
static int xl_set_mac_address(struct net_device *dev, void *addr) ; 
static void xl_arb_cmd(struct net_device *dev);
static void xl_asb_cmd(struct net_device *dev) ; 
static void xl_srb_cmd(struct net_device *dev, int srb_cmd) ; 
static void xl_wait_misr_flags(struct net_device *dev) ; 
static int xl_change_mtu(struct net_device *dev, int mtu);
static void xl_srb_bh(struct net_device *dev) ; 
static void xl_asb_bh(struct net_device *dev) ; 
static void xl_reset(struct net_device *dev) ;  
static void xl_freemem(struct net_device *dev) ;  


/* EEProm Access Functions */
static u16  xl_ee_read(struct net_device *dev, int ee_addr) ; 
static void  xl_ee_write(struct net_device *dev, int ee_addr, u16 ee_value) ; 

/* Debugging functions */
#if XL_DEBUG
static void print_tx_state(struct net_device *dev) ; 
static void print_rx_state(struct net_device *dev) ; 

static void print_tx_state(struct net_device *dev)
{

      struct xl_private *xl_priv = netdev_priv(dev);
      struct xl_tx_desc *txd ; 
      u8 __iomem *xl_mmio = xl_priv->xl_mmio ; 
      int i ; 

      printk("tx_ring_head: %d, tx_ring_tail: %d, free_ent: %d \n",xl_priv->tx_ring_head, 
            xl_priv->tx_ring_tail, xl_priv->free_ring_entries) ; 
      printk("Ring    , Address ,   FSH  , DnNextPtr, Buffer, Buffer_Len \n"); 
      for (i = 0; i < 16; i++) {
            txd = &(xl_priv->xl_tx_ring[i]) ; 
            printk("%d, %08lx, %08x, %08x, %08x, %08x \n", i, virt_to_bus(txd), 
                  txd->framestartheader, txd->dnnextptr, txd->buffer, txd->buffer_length ) ; 
      }

      printk("DNLISTPTR = %04x \n", readl(xl_mmio + MMIO_DNLISTPTR) ); 
      
      printk("DmaCtl = %04x \n", readl(xl_mmio + MMIO_DMA_CTRL) ); 
      printk("Queue status = %0x \n",netif_running(dev) ) ; 
}

static void print_rx_state(struct net_device *dev)
{

      struct xl_private *xl_priv = netdev_priv(dev);
      struct xl_rx_desc *rxd ; 
      u8 __iomem *xl_mmio = xl_priv->xl_mmio ; 
      int i ; 

      printk("rx_ring_tail: %d \n", xl_priv->rx_ring_tail) ; 
      printk("Ring    , Address ,   FrameState  , UPNextPtr, FragAddr, Frag_Len \n"); 
      for (i = 0; i < 16; i++) { 
            /* rxd = (struct xl_rx_desc *)xl_priv->rx_ring_dma_addr + (i * sizeof(struct xl_rx_desc)) ; */
            rxd = &(xl_priv->xl_rx_ring[i]) ; 
            printk("%d, %08lx, %08x, %08x, %08x, %08x \n", i, virt_to_bus(rxd), 
                  rxd->framestatus, rxd->upnextptr, rxd->upfragaddr, rxd->upfraglen ) ; 
      }

      printk("UPLISTPTR = %04x \n", readl(xl_mmio + MMIO_UPLISTPTR) ); 
      
      printk("DmaCtl = %04x \n", readl(xl_mmio + MMIO_DMA_CTRL) ); 
      printk("Queue status = %0x \n",netif_running(dev) ) ;
} 
#endif

/*
 *    Read values from the on-board EEProm.  This looks very strange
 *    but you have to wait for the EEProm to get/set the value before 
 *    passing/getting the next value from the nic. As with all requests
 *    on this nic it has to be done in two stages, a) tell the nic which
 *    memory address you want to access and b) pass/get the value from the nic.
 *    With the EEProm, you have to wait before and inbetween access a) and b).
 *    As this is only read at initialization time and the wait period is very 
 *    small we shouldn't have to worry about scheduling issues.
 */

static u16 xl_ee_read(struct net_device *dev, int ee_addr)
{ 
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem *xl_mmio = xl_priv->xl_mmio ; 

      /* Wait for EEProm to not be busy */
      writel(IO_WORD_READ | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      while ( readw(xl_mmio + MMIO_MACDATA) & EEBUSY ) ;

      /* Tell EEProm what we want to do and where */
      writel(IO_WORD_WRITE | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(EEREAD + ee_addr, xl_mmio + MMIO_MACDATA) ; 

      /* Wait for EEProm to not be busy */
      writel(IO_WORD_READ | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      while ( readw(xl_mmio + MMIO_MACDATA) & EEBUSY ) ; 
      
      /* Tell EEProm what we want to do and where */
      writel(IO_WORD_WRITE | EECONTROL , xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(EEREAD + ee_addr, xl_mmio + MMIO_MACDATA) ; 

      /* Finally read the value from the EEProm */
      writel(IO_WORD_READ | EEDATA , xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      return readw(xl_mmio + MMIO_MACDATA) ; 
}

/* 
 *    Write values to the onboard eeprom. As with eeprom read you need to 
 *    set which location to write, wait, value to write, wait, with the 
 *    added twist of having to enable eeprom writes as well.
 */

static void  xl_ee_write(struct net_device *dev, int ee_addr, u16 ee_value) 
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem *xl_mmio = xl_priv->xl_mmio ; 

      /* Wait for EEProm to not be busy */
      writel(IO_WORD_READ | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      while ( readw(xl_mmio + MMIO_MACDATA) & EEBUSY ) ;
      
      /* Enable write/erase */
      writel(IO_WORD_WRITE | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(EE_ENABLE_WRITE, xl_mmio + MMIO_MACDATA) ; 

      /* Wait for EEProm to not be busy */
      writel(IO_WORD_READ | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      while ( readw(xl_mmio + MMIO_MACDATA) & EEBUSY ) ;

      /* Put the value we want to write into EEDATA */ 
      writel(IO_WORD_WRITE | EEDATA, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(ee_value, xl_mmio + MMIO_MACDATA) ;

      /* Tell EEProm to write eevalue into ee_addr */
      writel(IO_WORD_WRITE | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(EEWRITE + ee_addr, xl_mmio + MMIO_MACDATA) ; 

      /* Wait for EEProm to not be busy, to ensure write gets done */
      writel(IO_WORD_READ | EECONTROL, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      while ( readw(xl_mmio + MMIO_MACDATA) & EEBUSY ) ;
      
      return ; 
}
 
static int __devinit xl_probe(struct pci_dev *pdev,
                        const struct pci_device_id *ent) 
{
      struct net_device *dev ; 
      struct xl_private *xl_priv ; 
      static int card_no = -1 ;
      int i ; 

      card_no++ ; 

      if (pci_enable_device(pdev)) { 
            return -ENODEV ; 
      } 

      pci_set_master(pdev);

      if ((i = pci_request_regions(pdev,"3c359"))) { 
            return i ; 
      } ; 

      /* 
       * Allowing init_trdev to allocate the dev->priv structure will align xl_private
       * on a 32 bytes boundary which we need for the rx/tx descriptors
       */

      dev = alloc_trdev(sizeof(struct xl_private)) ; 
      if (!dev) { 
            pci_release_regions(pdev) ; 
            return -ENOMEM ; 
      } 
      xl_priv = netdev_priv(dev);

#if XL_DEBUG  
      printk("pci_device: %p, dev:%p, dev->priv: %p, ba[0]: %10x, ba[1]:%10x\n", 
            pdev, dev, netdev_priv(dev), (unsigned int)pdev->resource[0].start, (unsigned int)pdev->resource[1].start);
#endif 

      dev->irq=pdev->irq;
      dev->base_addr=pci_resource_start(pdev,0) ; 
      xl_priv->xl_card_name = pci_name(pdev);
      xl_priv->xl_mmio=ioremap(pci_resource_start(pdev,1), XL_IO_SPACE);
      xl_priv->pdev = pdev ; 
            
      if ((pkt_buf_sz[card_no] < 100) || (pkt_buf_sz[card_no] > 18000) )
            xl_priv->pkt_buf_sz = PKT_BUF_SZ ; 
      else
            xl_priv->pkt_buf_sz = pkt_buf_sz[card_no] ; 

      dev->mtu = xl_priv->pkt_buf_sz - TR_HLEN ; 
      xl_priv->xl_ring_speed = ringspeed[card_no] ; 
      xl_priv->xl_message_level = message_level[card_no] ; 
      xl_priv->xl_functional_addr[0] = xl_priv->xl_functional_addr[1] = xl_priv->xl_functional_addr[2] = xl_priv->xl_functional_addr[3] = 0 ; 
      xl_priv->xl_copy_all_options = 0 ; 
            
      if((i = xl_init(dev))) {
            iounmap(xl_priv->xl_mmio) ; 
            free_netdev(dev) ; 
            pci_release_regions(pdev) ; 
            return i ; 
      }                       

      dev->open=&xl_open;
      dev->hard_start_xmit=&xl_xmit;
      dev->change_mtu=&xl_change_mtu;
      dev->stop=&xl_close;
      dev->do_ioctl=NULL;
      dev->set_multicast_list=&xl_set_rx_mode;
      dev->get_stats=&xl_get_stats ;
      dev->set_mac_address=&xl_set_mac_address ; 
      SET_NETDEV_DEV(dev, &pdev->dev);

      pci_set_drvdata(pdev,dev) ; 
      if ((i = register_netdev(dev))) { 
            printk(KERN_ERR "3C359, register netdev failed\n") ;  
            pci_set_drvdata(pdev,NULL) ; 
            iounmap(xl_priv->xl_mmio) ; 
            free_netdev(dev) ; 
            pci_release_regions(pdev) ; 
            return i ; 
      }
   
      printk(KERN_INFO "3C359: %s registered as: %s\n",xl_priv->xl_card_name,dev->name) ; 

      return 0; 
}


static int __devinit xl_init(struct net_device *dev) 
{
      struct xl_private *xl_priv = netdev_priv(dev);

      printk(KERN_INFO "%s \n", version);
      printk(KERN_INFO "%s: I/O at %hx, MMIO at %p, using irq %d\n",
            xl_priv->xl_card_name, (unsigned int)dev->base_addr ,xl_priv->xl_mmio, dev->irq);

      spin_lock_init(&xl_priv->xl_lock) ; 

      return xl_hw_reset(dev) ; 

}


/* 
 *    Hardware reset.  This needs to be a separate entity as we need to reset the card
 *    when we change the EEProm settings.
 */

static int xl_hw_reset(struct net_device *dev) 
{ 
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem *xl_mmio = xl_priv->xl_mmio ; 
      unsigned long t ; 
      u16 i ; 
      u16 result_16 ; 
      u8 result_8 ;
      u16 start ; 
      int j ;

      /*
       *  Reset the card.  If the card has got the microcode on board, we have 
         *  missed the initialization interrupt, so we must always do this.
       */

      writew( GLOBAL_RESET, xl_mmio + MMIO_COMMAND ) ; 

      /* 
       * Must wait for cmdInProgress bit (12) to clear before continuing with
       * card configuration.
       */

      t=jiffies;
      while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { 
            schedule();       
            if(jiffies-t > 40*HZ) {
                  printk(KERN_ERR "%s: 3COM 3C359 Velocity XL  card not responding to global reset.\n", dev->name);
                  return -ENODEV;
            }
      }

      /*
       *  Enable pmbar by setting bit in CPAttention
       */

      writel( (IO_BYTE_READ | CPATTENTION), xl_mmio + MMIO_MAC_ACCESS_CMD) ;
      result_8 = readb(xl_mmio + MMIO_MACDATA) ; 
      result_8 = result_8 | CPA_PMBARVIS ; 
      writel( (IO_BYTE_WRITE | CPATTENTION), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(result_8, xl_mmio + MMIO_MACDATA) ; 
      
      /*
       * Read cpHold bit in pmbar, if cleared we have got Flashrom on board.
       * If not, we need to upload the microcode to the card
       */

      writel( (IO_WORD_READ | PMBAR),xl_mmio + MMIO_MAC_ACCESS_CMD);  

#if XL_DEBUG
      printk(KERN_INFO "Read from PMBAR = %04x \n", readw(xl_mmio + MMIO_MACDATA)) ; 
#endif

      if ( readw( (xl_mmio + MMIO_MACDATA))  & PMB_CPHOLD ) { 

            /* Set PmBar, privateMemoryBase bits (8:2) to 0 */

            writel( (IO_WORD_READ | PMBAR),xl_mmio + MMIO_MAC_ACCESS_CMD);  
            result_16 = readw(xl_mmio + MMIO_MACDATA) ; 
            result_16 = result_16 & ~((0x7F) << 2) ; 
            writel( (IO_WORD_WRITE | PMBAR), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writew(result_16,xl_mmio + MMIO_MACDATA) ; 
      
            /* Set CPAttention, memWrEn bit */

            writel( (IO_BYTE_READ | CPATTENTION), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            result_8 = readb(xl_mmio + MMIO_MACDATA) ; 
            result_8 = result_8 | CPA_MEMWREN  ; 
            writel( (IO_BYTE_WRITE | CPATTENTION), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(result_8, xl_mmio + MMIO_MACDATA) ; 

            /* 
             * Now to write the microcode into the shared ram 
             * The microcode must finish at position 0xFFFF, so we must subtract
             * to get the start position for the code
             */

            start = (0xFFFF - (mc_size) + 1 ) ; /* Looks strange but ensures compiler only uses 16 bit unsigned int for this */ 
            
            printk(KERN_INFO "3C359: Uploading Microcode: "); 
            
            for (i = start, j = 0; j < mc_size; i++, j++) { 
                  writel(MEM_BYTE_WRITE | 0XD0000 | i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                  writeb(microcode[j],xl_mmio + MMIO_MACDATA) ; 
                  if (j % 1024 == 0)
                        printk(".");
            }
            printk("\n") ; 

            for (i=0;i < 16; i++) { 
                  writel( (MEM_BYTE_WRITE | 0xDFFF0) + i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                  writeb(microcode[mc_size - 16 + i], xl_mmio + MMIO_MACDATA) ; 
            }

            /*
             * Have to write the start address of the upload to FFF4, but
                 * the address must be >> 4. You do not want to know how long
                 * it took me to discover this.
             */

            writel(MEM_WORD_WRITE | 0xDFFF4, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writew(start >> 4, xl_mmio + MMIO_MACDATA);

            /* Clear the CPAttention, memWrEn Bit */
      
            writel( (IO_BYTE_READ | CPATTENTION), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            result_8 = readb(xl_mmio + MMIO_MACDATA) ; 
            result_8 = result_8 & ~CPA_MEMWREN ; 
            writel( (IO_BYTE_WRITE | CPATTENTION), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(result_8, xl_mmio + MMIO_MACDATA) ; 

            /* Clear the cpHold bit in pmbar */

            writel( (IO_WORD_READ | PMBAR),xl_mmio + MMIO_MAC_ACCESS_CMD);  
            result_16 = readw(xl_mmio + MMIO_MACDATA) ; 
            result_16 = result_16 & ~PMB_CPHOLD ; 
            writel( (IO_WORD_WRITE | PMBAR), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writew(result_16,xl_mmio + MMIO_MACDATA) ; 


      } /* If microcode upload required */

      /* 
       * The card should now go though a self test procedure and get itself ready
         * to be opened, we must wait for an srb response with the initialization
         * information. 
       */

#if XL_DEBUG
      printk(KERN_INFO "%s: Microcode uploaded, must wait for the self test to complete\n", dev->name);
#endif

      writew(SETINDENABLE | 0xFFF, xl_mmio + MMIO_COMMAND) ; 

      t=jiffies;
      while ( !(readw(xl_mmio + MMIO_INTSTATUS_AUTO) & INTSTAT_SRB) ) { 
            schedule();       
            if(jiffies-t > 15*HZ) {
                  printk(KERN_ERR "3COM 3C359 Velocity XL  card not responding.\n");
                  return -ENODEV; 
            }
      }

      /*
       * Write the RxBufArea with D000, RxEarlyThresh, TxStartThresh, 
       * DnPriReqThresh, read the tech docs if you want to know what
       * values they need to be.
       */

      writel(MMIO_WORD_WRITE | RXBUFAREA, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(0xD000, xl_mmio + MMIO_MACDATA) ; 
      
      writel(MMIO_WORD_WRITE | RXEARLYTHRESH, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(0X0020, xl_mmio + MMIO_MACDATA) ; 
      
      writew( SETTXSTARTTHRESH | 0x40 , xl_mmio + MMIO_COMMAND) ; 

      writeb(0x04, xl_mmio + MMIO_DNBURSTTHRESH) ; 
      writeb(0x04, xl_mmio + DNPRIREQTHRESH) ;

      /*
       * Read WRBR to provide the location of the srb block, have to use byte reads not word reads. 
       * Tech docs have this wrong !!!!
       */

      writel(MMIO_BYTE_READ | WRBR, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      xl_priv->srb = readb(xl_mmio + MMIO_MACDATA) << 8 ; 
      writel( (MMIO_BYTE_READ | WRBR) + 1, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      xl_priv->srb = xl_priv->srb | readb(xl_mmio + MMIO_MACDATA) ;

#if XL_DEBUG
      writel(IO_WORD_READ | SWITCHSETTINGS, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      if ( readw(xl_mmio + MMIO_MACDATA) & 2) { 
            printk(KERN_INFO "Default ring speed 4 mbps \n") ;
      } else {
            printk(KERN_INFO "Default ring speed 16 mbps \n") ; 
      } 
      printk(KERN_INFO "%s: xl_priv->srb = %04x\n",xl_priv->xl_card_name, xl_priv->srb);
#endif

      return 0;
}

static int xl_open(struct net_device *dev) 
{
      struct xl_private *xl_priv=netdev_priv(dev);
      u8 __iomem *xl_mmio = xl_priv->xl_mmio ; 
      u8 i ; 
      __le16 hwaddr[3] ; /* Should be u8[6] but we get word return values */
      int open_err ;

      u16 switchsettings, switchsettings_eeprom  ;
 
      if(request_irq(dev->irq, &xl_interrupt, IRQF_SHARED , "3c359", dev)) {
            return -EAGAIN;
      }

      /* 
       * Read the information from the EEPROM that we need.
       */
      
      hwaddr[0] = cpu_to_le16(xl_ee_read(dev,0x10));
      hwaddr[1] = cpu_to_le16(xl_ee_read(dev,0x11));
      hwaddr[2] = cpu_to_le16(xl_ee_read(dev,0x12));

      /* Ring speed */

      switchsettings_eeprom = xl_ee_read(dev,0x08) ;
      switchsettings = switchsettings_eeprom ;  

      if (xl_priv->xl_ring_speed != 0) { 
            if (xl_priv->xl_ring_speed == 4)  
                  switchsettings = switchsettings | 0x02 ; 
            else 
                  switchsettings = switchsettings & ~0x02 ; 
      }

      /* Only write EEProm if there has been a change */
      if (switchsettings != switchsettings_eeprom) { 
            xl_ee_write(dev,0x08,switchsettings) ; 
            /* Hardware reset after changing EEProm */
            xl_hw_reset(dev) ; 
      }

      memcpy(dev->dev_addr,hwaddr,dev->addr_len) ; 
      
      open_err = xl_open_hw(dev) ; 

      /* 
       * This really needs to be cleaned up with better error reporting.
       */

      if (open_err != 0) { /* Something went wrong with the open command */
            if (open_err & 0x07) { /* Wrong speed, retry at different speed */
                  printk(KERN_WARNING "%s: Open Error, retrying at different ringspeed \n", dev->name) ; 
                  switchsettings = switchsettings ^ 2 ; 
                  xl_ee_write(dev,0x08,switchsettings) ; 
                  xl_hw_reset(dev) ; 
                  open_err = xl_open_hw(dev) ; 
                  if (open_err != 0) { 
                        printk(KERN_WARNING "%s: Open error returned a second time, we're bombing out now\n", dev->name); 
                        free_irq(dev->irq,dev) ;                                    
                        return -ENODEV ;
                  }  
            } else { 
                  printk(KERN_WARNING "%s: Open Error = %04x\n", dev->name, open_err) ; 
                  free_irq(dev->irq,dev) ; 
                  return -ENODEV ; 
            }
      }

      /*
       * Now to set up the Rx and Tx buffer structures
       */
      /* These MUST be on 8 byte boundaries */
      xl_priv->xl_tx_ring = kzalloc((sizeof(struct xl_tx_desc) * XL_TX_RING_SIZE) + 7, GFP_DMA | GFP_KERNEL);
      if (xl_priv->xl_tx_ring == NULL) {
            printk(KERN_WARNING "%s: Not enough memory to allocate rx buffers.\n",
                             dev->name);
            free_irq(dev->irq,dev);
            return -ENOMEM;
      }
      xl_priv->xl_rx_ring = kzalloc((sizeof(struct xl_rx_desc) * XL_RX_RING_SIZE) +7, GFP_DMA | GFP_KERNEL);
      if (xl_priv->xl_tx_ring == NULL) {
            printk(KERN_WARNING "%s: Not enough memory to allocate rx buffers.\n",
                             dev->name);
            free_irq(dev->irq,dev);
            kfree(xl_priv->xl_tx_ring);
            return -ENOMEM;
      }

       /* Setup Rx Ring */
       for (i=0 ; i < XL_RX_RING_SIZE ; i++) { 
            struct sk_buff *skb ; 

            skb = dev_alloc_skb(xl_priv->pkt_buf_sz) ; 
            if (skb==NULL) 
                  break ; 

            skb->dev = dev ; 
            xl_priv->xl_rx_ring[i].upfragaddr = cpu_to_le32(pci_map_single(xl_priv->pdev, skb->data,xl_priv->pkt_buf_sz, PCI_DMA_FROMDEVICE));
            xl_priv->xl_rx_ring[i].upfraglen = cpu_to_le32(xl_priv->pkt_buf_sz) | RXUPLASTFRAG;
            xl_priv->rx_ring_skb[i] = skb ;     
      }

      if (i==0) { 
            printk(KERN_WARNING "%s: Not enough memory to allocate rx buffers. Adapter disabled \n",dev->name) ; 
            free_irq(dev->irq,dev) ; 
            return -EIO ; 
      } 

      xl_priv->rx_ring_no = i ; 
      xl_priv->rx_ring_tail = 0 ; 
      xl_priv->rx_ring_dma_addr = pci_map_single(xl_priv->pdev,xl_priv->xl_rx_ring, sizeof(struct xl_rx_desc) * XL_RX_RING_SIZE, PCI_DMA_TODEVICE) ; 
      for (i=0;i<(xl_priv->rx_ring_no-1);i++) { 
            xl_priv->xl_rx_ring[i].upnextptr = cpu_to_le32(xl_priv->rx_ring_dma_addr + (sizeof (struct xl_rx_desc) * (i+1)));
      } 
      xl_priv->xl_rx_ring[i].upnextptr = 0 ; 

      writel(xl_priv->rx_ring_dma_addr, xl_mmio + MMIO_UPLISTPTR) ; 
      
      /* Setup Tx Ring */
      
      xl_priv->tx_ring_dma_addr = pci_map_single(xl_priv->pdev,xl_priv->xl_tx_ring, sizeof(struct xl_tx_desc) * XL_TX_RING_SIZE,PCI_DMA_TODEVICE) ; 
      
      xl_priv->tx_ring_head = 1 ; 
      xl_priv->tx_ring_tail = 255 ; /* Special marker for first packet */
      xl_priv->free_ring_entries = XL_TX_RING_SIZE ; 

      /*
       * Setup the first dummy DPD entry for polling to start working.
       */

      xl_priv->xl_tx_ring[0].framestartheader = TXDPDEMPTY;
      xl_priv->xl_tx_ring[0].buffer = 0 ; 
      xl_priv->xl_tx_ring[0].buffer_length = 0 ; 
      xl_priv->xl_tx_ring[0].dnnextptr = 0 ; 

      writel(xl_priv->tx_ring_dma_addr, xl_mmio + MMIO_DNLISTPTR) ; 
      writel(DNUNSTALL, xl_mmio + MMIO_COMMAND) ; 
      writel(UPUNSTALL, xl_mmio + MMIO_COMMAND) ; 
      writel(DNENABLE, xl_mmio + MMIO_COMMAND) ; 
      writeb(0x40, xl_mmio + MMIO_DNPOLL) ;     

      /*
       * Enable interrupts on the card
       */

      writel(SETINTENABLE | INT_MASK, xl_mmio + MMIO_COMMAND) ; 
      writel(SETINDENABLE | INT_MASK, xl_mmio + MMIO_COMMAND) ; 

      netif_start_queue(dev) ;      
      return 0;
      
}     

static int xl_open_hw(struct net_device *dev) 
{ 
      struct xl_private *xl_priv=netdev_priv(dev);
      u8 __iomem *xl_mmio = xl_priv->xl_mmio ; 
      u16 vsoff ;
      char ver_str[33];  
      int open_err ; 
      int i ; 
      unsigned long t ; 

      /*
       * Okay, let's build up the Open.NIC srb command
       *
       */
            
      writel( (MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(OPEN_NIC, xl_mmio + MMIO_MACDATA) ; 
      
      /*
       * Use this as a test byte, if it comes back with the same value, the command didn't work
       */

      writel( (MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb)+ 2, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(0xff,xl_mmio + MMIO_MACDATA) ; 

      /* Open options */
      writel( (MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb) + 8, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(0x00, xl_mmio + MMIO_MACDATA) ; 
      writel( (MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb) + 9, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(0x00, xl_mmio + MMIO_MACDATA) ; 

      /* 
       * Node address, be careful here, the docs say you can just put zeros here and it will use
       * the hardware address, it doesn't, you must include the node address in the open command.
       */

      if (xl_priv->xl_laa[0]) {  /* If using a LAA address */
            for (i=10;i<16;i++) { 
                  writel( (MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb) + i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                  writeb(xl_priv->xl_laa[i-10],xl_mmio + MMIO_MACDATA) ;
            }
            memcpy(dev->dev_addr,xl_priv->xl_laa,dev->addr_len) ; 
      } else { /* Regular hardware address */ 
            for (i=10;i<16;i++) { 
                  writel( (MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb) + i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                  writeb(dev->dev_addr[i-10], xl_mmio + MMIO_MACDATA) ; 
            }
      }

      /* Default everything else to 0 */
      for (i = 16; i < 34; i++) {
            writel( (MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb) + i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(0x00,xl_mmio + MMIO_MACDATA) ; 
      }
      
      /*
       *  Set the csrb bit in the MISR register
       */

      xl_wait_misr_flags(dev) ; 
      writel(MEM_BYTE_WRITE | MF_CSRB, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(0xFF, xl_mmio + MMIO_MACDATA) ; 
      writel(MMIO_BYTE_WRITE | MISR_SET, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(MISR_CSRB , xl_mmio + MMIO_MACDATA) ; 

      /*
       * Now wait for the command to run
       */

      t=jiffies;
      while (! (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_SRB)) { 
            schedule();       
            if(jiffies-t > 40*HZ) {
                  printk(KERN_ERR "3COM 3C359 Velocity XL  card not responding.\n");
                  break ; 
            }
      }

      /*
       * Let's interpret the open response
       */

      writel( (MEM_BYTE_READ | 0xD0000 | xl_priv->srb)+2, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      if (readb(xl_mmio + MMIO_MACDATA)!=0) {
            open_err = readb(xl_mmio + MMIO_MACDATA) << 8 ; 
            writel( (MEM_BYTE_READ | 0xD0000 | xl_priv->srb) + 7, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            open_err |= readb(xl_mmio + MMIO_MACDATA) ; 
            return open_err ; 
      } else { 
            writel( (MEM_WORD_READ | 0xD0000 | xl_priv->srb) + 8, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            xl_priv->asb = swab16(readw(xl_mmio + MMIO_MACDATA)) ;
            printk(KERN_INFO "%s: Adapter Opened Details: ",dev->name) ; 
            printk("ASB: %04x",xl_priv->asb ) ; 
            writel( (MEM_WORD_READ | 0xD0000 | xl_priv->srb) + 10, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            printk(", SRB: %04x",swab16(readw(xl_mmio + MMIO_MACDATA)) ) ;
 
            writel( (MEM_WORD_READ | 0xD0000 | xl_priv->srb) + 12, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            xl_priv->arb = swab16(readw(xl_mmio + MMIO_MACDATA)) ;
            printk(", ARB: %04x \n",xl_priv->arb ) ; 
            writel( (MEM_WORD_READ | 0xD0000 | xl_priv->srb) + 14, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            vsoff = swab16(readw(xl_mmio + MMIO_MACDATA)) ;

            /* 
             * Interesting, sending the individual characters directly to printk was causing klogd to use
             * use 100% of processor time, so we build up the string and print that instead.
             */

            for (i=0;i<0x20;i++) { 
                  writel( (MEM_BYTE_READ | 0xD0000 | vsoff) + i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                  ver_str[i] = readb(xl_mmio + MMIO_MACDATA) ; 
            }
            ver_str[i] = '\0' ; 
            printk(KERN_INFO "%s: Microcode version String: %s \n",dev->name,ver_str); 
      }     
      
      /*
       * Issue the AckInterrupt
       */
      writew(ACK_INTERRUPT | SRBRACK | LATCH_ACK, xl_mmio + MMIO_COMMAND) ; 

      return 0 ; 
}

/*
 *    There are two ways of implementing rx on the 359 NIC, either
 *    interrupt driven or polling.  We are going to uses interrupts,
 *    it is the easier way of doing things.
 *    
 *    The Rx works with a ring of Rx descriptors.  At initialise time the ring
 *    entries point to the next entry except for the last entry in the ring 
 *    which points to 0.  The card is programmed with the location of the first
 *    available descriptor and keeps reading the next_ptr until next_ptr is set
 *    to 0.  Hopefully with a ring size of 16 the card will never get to read a next_ptr
 *    of 0.  As the Rx interrupt is received we copy the frame up to the protocol layers
 *    and then point the end of the ring to our current position and point our current
 *    position to 0, therefore making the current position the last position on the ring.
 *    The last position on the ring therefore loops continually loops around the rx ring.
 *    
 *    rx_ring_tail is the position on the ring to process next. (Think of a snake, the head 
 *    expands as the card adds new packets and we go around eating the tail processing the
 *    packets.)
 *
 *    Undoubtably it could be streamlined and improved upon, but at the moment it works 
 *    and the fast path through the routine is fine. 
 *    
 *    adv_rx_ring could be inlined to increase performance, but its called a *lot* of times
 *    in xl_rx so would increase the size of the function significantly. 
 */

static void adv_rx_ring(struct net_device *dev) /* Advance rx_ring, cut down on bloat in xl_rx */ 
{
      struct xl_private *xl_priv=netdev_priv(dev);
      int n = xl_priv->rx_ring_tail;
      int prev_ring_loc;

      prev_ring_loc = (n + XL_RX_RING_SIZE - 1) & (XL_RX_RING_SIZE - 1);
      xl_priv->xl_rx_ring[prev_ring_loc].upnextptr = cpu_to_le32(xl_priv->rx_ring_dma_addr + (sizeof (struct xl_rx_desc) * n));
      xl_priv->xl_rx_ring[n].framestatus = 0;
      xl_priv->xl_rx_ring[n].upnextptr = 0;
      xl_priv->rx_ring_tail++;
      xl_priv->rx_ring_tail &= (XL_RX_RING_SIZE-1);
}

static void xl_rx(struct net_device *dev)
{
      struct xl_private *xl_priv=netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      struct sk_buff *skb, *skb2 ; 
      int frame_length = 0, copy_len = 0  ;     
      int temp_ring_loc ;  

      /*
       * Receive the next frame, loop around the ring until all frames
       * have been received.
       */    
      
      while (xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].framestatus & (RXUPDCOMPLETE | RXUPDFULL) ) { /* Descriptor to process */

            if (xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].framestatus & RXUPDFULL ) { /* UpdFull, Multiple Descriptors used for the frame */

                  /* 
                   * This is a pain, you need to go through all the descriptors until the last one 
                   * for this frame to find the framelength
                   */

                  temp_ring_loc = xl_priv->rx_ring_tail ; 

                  while (xl_priv->xl_rx_ring[temp_ring_loc].framestatus & RXUPDFULL ) {
                        temp_ring_loc++ ; 
                        temp_ring_loc &= (XL_RX_RING_SIZE-1) ; 
                  }

                  frame_length = le32_to_cpu(xl_priv->xl_rx_ring[temp_ring_loc].framestatus) & 0x7FFF;

                  skb = dev_alloc_skb(frame_length) ;
 
                  if (skb==NULL) { /* No memory for frame, still need to roll forward the rx ring */
                        printk(KERN_WARNING "%s: dev_alloc_skb failed - multi buffer !\n", dev->name) ; 
                        while (xl_priv->rx_ring_tail != temp_ring_loc)  
                              adv_rx_ring(dev) ; 
                        
                        adv_rx_ring(dev) ; /* One more time just for luck :) */ 
                        xl_priv->xl_stats.rx_dropped++ ; 

                        writel(ACK_INTERRUPT | UPCOMPACK | LATCH_ACK , xl_mmio + MMIO_COMMAND) ; 
                        return ;                      
                  }
      
                  while (xl_priv->rx_ring_tail != temp_ring_loc) { 
                        copy_len = le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfraglen) & 0x7FFF;
                        frame_length -= copy_len ;  
                        pci_dma_sync_single_for_cpu(xl_priv->pdev,le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr),xl_priv->pkt_buf_sz,PCI_DMA_FROMDEVICE);
                        skb_copy_from_linear_data(xl_priv->rx_ring_skb[xl_priv->rx_ring_tail],
                                            skb_put(skb, copy_len),
                                            copy_len);
                        pci_dma_sync_single_for_device(xl_priv->pdev,le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr),xl_priv->pkt_buf_sz,PCI_DMA_FROMDEVICE);
                        adv_rx_ring(dev) ; 
                  } 

                  /* Now we have found the last fragment */
                  pci_dma_sync_single_for_cpu(xl_priv->pdev,le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr),xl_priv->pkt_buf_sz,PCI_DMA_FROMDEVICE);
                  skb_copy_from_linear_data(xl_priv->rx_ring_skb[xl_priv->rx_ring_tail],
                              skb_put(skb,copy_len), frame_length);
/*                memcpy(skb_put(skb,frame_length), bus_to_virt(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr), frame_length) ; */
                  pci_dma_sync_single_for_device(xl_priv->pdev,le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr),xl_priv->pkt_buf_sz,PCI_DMA_FROMDEVICE);
                  adv_rx_ring(dev) ; 
                  skb->protocol = tr_type_trans(skb,dev) ; 
                  netif_rx(skb) ; 

            } else { /* Single Descriptor Used, simply swap buffers over, fast path  */

                  frame_length = le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].framestatus) & 0x7FFF;
                  
                  skb = dev_alloc_skb(xl_priv->pkt_buf_sz) ; 

                  if (skb==NULL) { /* Still need to fix the rx ring */
                        printk(KERN_WARNING "%s: dev_alloc_skb failed in rx, single buffer \n",dev->name) ; 
                        adv_rx_ring(dev) ; 
                        xl_priv->xl_stats.rx_dropped++ ; 
                        writel(ACK_INTERRUPT | UPCOMPACK | LATCH_ACK , xl_mmio + MMIO_COMMAND) ; 
                        return ; 
                  }

                  skb2 = xl_priv->rx_ring_skb[xl_priv->rx_ring_tail] ; 
                  pci_unmap_single(xl_priv->pdev, le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr), xl_priv->pkt_buf_sz,PCI_DMA_FROMDEVICE) ;
                  skb_put(skb2, frame_length) ; 
                  skb2->protocol = tr_type_trans(skb2,dev) ; 

                  xl_priv->rx_ring_skb[xl_priv->rx_ring_tail] = skb ;   
                  xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr = cpu_to_le32(pci_map_single(xl_priv->pdev,skb->data,xl_priv->pkt_buf_sz, PCI_DMA_FROMDEVICE));
                  xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfraglen = cpu_to_le32(xl_priv->pkt_buf_sz) | RXUPLASTFRAG;
                  adv_rx_ring(dev) ; 
                  xl_priv->xl_stats.rx_packets++ ; 
                  xl_priv->xl_stats.rx_bytes += frame_length ;    

                  netif_rx(skb2) ;        
             } /* if multiple buffers */
            dev->last_rx = jiffies ;      
      } /* while packet to do */

      /* Clear the updComplete interrupt */
      writel(ACK_INTERRUPT | UPCOMPACK | LATCH_ACK , xl_mmio + MMIO_COMMAND) ; 
      return ;    
}

/*
 * This is ruthless, it doesn't care what state the card is in it will 
 * completely reset the adapter.
 */

static void xl_reset(struct net_device *dev) 
{
      struct xl_private *xl_priv=netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      unsigned long t; 

      writew( GLOBAL_RESET, xl_mmio + MMIO_COMMAND ) ; 

      /* 
       * Must wait for cmdInProgress bit (12) to clear before continuing with
       * card configuration.
       */

      t=jiffies;
      while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { 
            if(jiffies-t > 40*HZ) {
                  printk(KERN_ERR "3COM 3C359 Velocity XL  card not responding.\n");
                  break ; 
            }
      }
      
}

static void xl_freemem(struct net_device *dev) 
{
      struct xl_private *xl_priv=netdev_priv(dev);
      int i ; 

      for (i=0;i<XL_RX_RING_SIZE;i++) {
            dev_kfree_skb_irq(xl_priv->rx_ring_skb[xl_priv->rx_ring_tail]) ; 
            pci_unmap_single(xl_priv->pdev,le32_to_cpu(xl_priv->xl_rx_ring[xl_priv->rx_ring_tail].upfragaddr),xl_priv->pkt_buf_sz, PCI_DMA_FROMDEVICE);
            xl_priv->rx_ring_tail++ ; 
            xl_priv->rx_ring_tail &= XL_RX_RING_SIZE-1; 
      } 

      /* unmap ring */
      pci_unmap_single(xl_priv->pdev,xl_priv->rx_ring_dma_addr, sizeof(struct xl_rx_desc) * XL_RX_RING_SIZE, PCI_DMA_FROMDEVICE) ; 
      
      pci_unmap_single(xl_priv->pdev,xl_priv->tx_ring_dma_addr, sizeof(struct xl_tx_desc) * XL_TX_RING_SIZE, PCI_DMA_TODEVICE) ; 

      kfree(xl_priv->xl_rx_ring) ; 
      kfree(xl_priv->xl_tx_ring) ; 

      return  ; 
}

static irqreturn_t xl_interrupt(int irq, void *dev_id) 
{
      struct net_device *dev = (struct net_device *)dev_id;
      struct xl_private *xl_priv =netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      u16 intstatus, macstatus  ;

      intstatus = readw(xl_mmio + MMIO_INTSTATUS) ;  

      if (!(intstatus & 1)) /* We didn't generate the interrupt */
            return IRQ_NONE;

      spin_lock(&xl_priv->xl_lock) ; 

      /*
       * Process the interrupt
       */
      /*
       * Something fishy going on here, we shouldn't get 0001 ints, not fatal though.
       */
      if (intstatus == 0x0001) {  
            writel(ACK_INTERRUPT | LATCH_ACK, xl_mmio + MMIO_COMMAND) ;
            printk(KERN_INFO "%s: 00001 int received \n",dev->name) ;  
      } else {  
            if (intstatus &   (HOSTERRINT | SRBRINT | ARBCINT | UPCOMPINT | DNCOMPINT | HARDERRINT | (1<<8) | TXUNDERRUN | ASBFINT)) { 
                  
                  /* 
                   * Host Error.
                   * It may be possible to recover from this, but usually it means something
                   * is seriously fubar, so we just close the adapter.
                   */

                  if (intstatus & HOSTERRINT) {
                        printk(KERN_WARNING "%s: Host Error, performing global reset, intstatus = %04x \n",dev->name,intstatus) ; 
                        writew( GLOBAL_RESET, xl_mmio + MMIO_COMMAND ) ;
                        printk(KERN_WARNING "%s: Resetting hardware: \n", dev->name); 
                        netif_stop_queue(dev) ;
                        xl_freemem(dev) ; 
                        free_irq(dev->irq,dev);       
                        xl_reset(dev) ; 
                        writel(ACK_INTERRUPT | LATCH_ACK, xl_mmio + MMIO_COMMAND) ; 
                        spin_unlock(&xl_priv->xl_lock) ; 
                        return IRQ_HANDLED;
                  } /* Host Error */

                  if (intstatus & SRBRINT ) {  /* Srbc interrupt */
                        writel(ACK_INTERRUPT | SRBRACK | LATCH_ACK, xl_mmio + MMIO_COMMAND) ;
                        if (xl_priv->srb_queued)
                              xl_srb_bh(dev) ; 
                  } /* SRBR Interrupt */

                  if (intstatus & TXUNDERRUN) { /* Issue DnReset command */
                        writel(DNRESET, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                        while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { /* Wait for command to run */
                              /* !!! FIX-ME !!!! 
                              Must put a timeout check here ! */
                              /* Empty Loop */
                        } 
                        printk(KERN_WARNING "%s: TX Underrun received \n",dev->name) ;
                        writel(ACK_INTERRUPT | LATCH_ACK, xl_mmio + MMIO_COMMAND) ; 
                  } /* TxUnderRun */
      
                  if (intstatus & ARBCINT ) { /* Arbc interrupt */
                        xl_arb_cmd(dev) ; 
                  } /* Arbc */

                  if (intstatus & ASBFINT) { 
                        if (xl_priv->asb_queued == 1) {
                              xl_asb_cmd(dev) ; 
                        } else if (xl_priv->asb_queued == 2) {
                              xl_asb_bh(dev) ; 
                        } else { 
                              writel(ACK_INTERRUPT | LATCH_ACK | ASBFACK, xl_mmio + MMIO_COMMAND) ; 
                        }  
                  } /* Asbf */

                  if (intstatus & UPCOMPINT ) /* UpComplete */
                        xl_rx(dev) ; 

                  if (intstatus & DNCOMPINT )  /* DnComplete */
                        xl_dn_comp(dev) ; 

                  if (intstatus & HARDERRINT ) { /* Hardware error */
                        writel(MMIO_WORD_READ | MACSTATUS, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                        macstatus = readw(xl_mmio + MMIO_MACDATA) ; 
                        printk(KERN_WARNING "%s: MacStatusError, details: ", dev->name);
                        if (macstatus & (1<<14)) 
                              printk(KERN_WARNING "tchk error: Unrecoverable error \n") ; 
                        if (macstatus & (1<<3))
                              printk(KERN_WARNING "eint error: Internal watchdog timer expired \n") ;
                        if (macstatus & (1<<2))
                              printk(KERN_WARNING "aint error: Host tried to perform invalid operation \n") ; 
                        printk(KERN_WARNING "Instatus = %02x, macstatus = %02x\n",intstatus,macstatus) ; 
                        printk(KERN_WARNING "%s: Resetting hardware: \n", dev->name); 
                        netif_stop_queue(dev) ;
                        xl_freemem(dev) ; 
                        free_irq(dev->irq,dev); 
                        unregister_netdev(dev) ; 
                        free_netdev(dev) ;  
                        xl_reset(dev) ; 
                        writel(ACK_INTERRUPT | LATCH_ACK, xl_mmio + MMIO_COMMAND) ; 
                        spin_unlock(&xl_priv->xl_lock) ; 
                        return IRQ_HANDLED;
                  }
            } else { 
                  printk(KERN_WARNING "%s: Received Unknown interrupt : %04x \n", dev->name, intstatus) ;
                  writel(ACK_INTERRUPT | LATCH_ACK, xl_mmio + MMIO_COMMAND) ;       
            }
      } 

      /* Turn interrupts back on */

      writel( SETINDENABLE | INT_MASK, xl_mmio + MMIO_COMMAND) ; 
      writel( SETINTENABLE | INT_MASK, xl_mmio + MMIO_COMMAND) ; 

      spin_unlock(&xl_priv->xl_lock) ;
      return IRQ_HANDLED;
}     

/*
 *    Tx - Polling configuration
 */
      
static int xl_xmit(struct sk_buff *skb, struct net_device *dev) 
{
      struct xl_private *xl_priv=netdev_priv(dev);
      struct xl_tx_desc *txd ; 
      int tx_head, tx_tail, tx_prev ; 
      unsigned long flags ;   

      spin_lock_irqsave(&xl_priv->xl_lock,flags) ; 

      netif_stop_queue(dev) ; 

      if (xl_priv->free_ring_entries > 1 ) {    
            /*
             * Set up the descriptor for the packet 
             */
            tx_head = xl_priv->tx_ring_head ; 
            tx_tail = xl_priv->tx_ring_tail ; 

            txd = &(xl_priv->xl_tx_ring[tx_head]) ; 
            txd->dnnextptr = 0 ; 
            txd->framestartheader = cpu_to_le32(skb->len) | TXDNINDICATE;
            txd->buffer = cpu_to_le32(pci_map_single(xl_priv->pdev, skb->data, skb->len, PCI_DMA_TODEVICE));
            txd->buffer_length = cpu_to_le32(skb->len) | TXDNFRAGLAST;
            xl_priv->tx_ring_skb[tx_head] = skb ; 
            xl_priv->xl_stats.tx_packets++ ; 
            xl_priv->xl_stats.tx_bytes += skb->len ;

            /* 
             * Set the nextptr of the previous descriptor equal to this descriptor, add XL_TX_RING_SIZE -1 
             * to ensure no negative numbers in unsigned locations.
             */ 
      
            tx_prev = (xl_priv->tx_ring_head + XL_TX_RING_SIZE - 1) & (XL_TX_RING_SIZE - 1) ; 

            xl_priv->tx_ring_head++ ; 
            xl_priv->tx_ring_head &= (XL_TX_RING_SIZE - 1) ;
            xl_priv->free_ring_entries-- ; 

            xl_priv->xl_tx_ring[tx_prev].dnnextptr = cpu_to_le32(xl_priv->tx_ring_dma_addr + (sizeof (struct xl_tx_desc) * tx_head));

            /* Sneaky, by doing a read on DnListPtr we can force the card to poll on the DnNextPtr */
            /* readl(xl_mmio + MMIO_DNLISTPTR) ; */

            netif_wake_queue(dev) ; 

            spin_unlock_irqrestore(&xl_priv->xl_lock,flags) ; 
 
            return 0;
      } else {
            spin_unlock_irqrestore(&xl_priv->xl_lock,flags) ; 
            return 1;
      }

}
      
/* 
 * The NIC has told us that a packet has been downloaded onto the card, we must
 * find out which packet it has done, clear the skb and information for the packet
 * then advance around the ring for all tranmitted packets
 */

static void xl_dn_comp(struct net_device *dev) 
{
      struct xl_private *xl_priv=netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      struct xl_tx_desc *txd ; 


      if (xl_priv->tx_ring_tail == 255) {/* First time */
            xl_priv->xl_tx_ring[0].framestartheader = 0 ; 
            xl_priv->xl_tx_ring[0].dnnextptr = 0 ;  
            xl_priv->tx_ring_tail = 1 ; 
      }

      while (xl_priv->xl_tx_ring[xl_priv->tx_ring_tail].framestartheader & TXDNCOMPLETE ) { 
            txd = &(xl_priv->xl_tx_ring[xl_priv->tx_ring_tail]) ;
            pci_unmap_single(xl_priv->pdev, le32_to_cpu(txd->buffer), xl_priv->tx_ring_skb[xl_priv->tx_ring_tail]->len, PCI_DMA_TODEVICE);
            txd->framestartheader = 0 ; 
            txd->buffer = cpu_to_le32(0xdeadbeef);
            txd->buffer_length  = 0 ;  
            dev_kfree_skb_irq(xl_priv->tx_ring_skb[xl_priv->tx_ring_tail]) ;
            xl_priv->tx_ring_tail++ ; 
            xl_priv->tx_ring_tail &= (XL_TX_RING_SIZE - 1) ; 
            xl_priv->free_ring_entries++ ; 
      }

      netif_wake_queue(dev) ; 

      writel(ACK_INTERRUPT | DNCOMPACK | LATCH_ACK , xl_mmio + MMIO_COMMAND) ; 
}

/*
 * Close the adapter properly.
 * This srb reply cannot be handled from interrupt context as we have
 * to free the interrupt from the driver. 
 */

static int xl_close(struct net_device *dev) 
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      unsigned long t ; 

      netif_stop_queue(dev) ; 

      /*
       * Close the adapter, need to stall the rx and tx queues.
       */

      writew(DNSTALL, xl_mmio + MMIO_COMMAND) ; 
      t=jiffies;
      while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { 
            schedule();       
            if(jiffies-t > 10*HZ) {
                  printk(KERN_ERR "%s: 3COM 3C359 Velocity XL-DNSTALL not responding.\n", dev->name);
                  break ; 
            }
      }
      writew(DNDISABLE, xl_mmio + MMIO_COMMAND) ; 
      t=jiffies;
      while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { 
            schedule();       
            if(jiffies-t > 10*HZ) {
                  printk(KERN_ERR "%s: 3COM 3C359 Velocity XL-DNDISABLE not responding.\n", dev->name);
                  break ;
            }
      }
      writew(UPSTALL, xl_mmio + MMIO_COMMAND) ; 
      t=jiffies;
      while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { 
            schedule();       
            if(jiffies-t > 10*HZ) {
                  printk(KERN_ERR "%s: 3COM 3C359 Velocity XL-UPSTALL not responding.\n", dev->name);
                  break ; 
            }
      }

      /* Turn off interrupts, we will still get the indication though
       * so we can trap it
       */

      writel(SETINTENABLE, xl_mmio + MMIO_COMMAND) ; 

      xl_srb_cmd(dev,CLOSE_NIC) ; 

      t=jiffies;
      while (!(readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_SRB)) { 
            schedule();       
            if(jiffies-t > 10*HZ) {
                  printk(KERN_ERR "%s: 3COM 3C359 Velocity XL-CLOSENIC not responding.\n", dev->name);
                  break ; 
            }
      }
      /* Read the srb response from the adapter */

      writel(MEM_BYTE_READ | 0xd0000 | xl_priv->srb, xl_mmio + MMIO_MAC_ACCESS_CMD);
      if (readb(xl_mmio + MMIO_MACDATA) != CLOSE_NIC) { 
            printk(KERN_INFO "%s: CLOSE_NIC did not get a CLOSE_NIC response \n",dev->name) ; 
      } else { 
            writel((MEM_BYTE_READ | 0xd0000 | xl_priv->srb) +2, xl_mmio + MMIO_MAC_ACCESS_CMD) ;
            if (readb(xl_mmio + MMIO_MACDATA)==0) { 
                  printk(KERN_INFO "%s: Adapter has been closed \n",dev->name) ;
                  writew(ACK_INTERRUPT | SRBRACK | LATCH_ACK, xl_mmio + MMIO_COMMAND) ; 

                  xl_freemem(dev) ; 
                  free_irq(dev->irq,dev) ; 
            } else { 
                  printk(KERN_INFO "%s: Close nic command returned error code %02x\n",dev->name, readb(xl_mmio + MMIO_MACDATA)) ;
            } 
      }

      /* Reset the upload and download logic */
 
      writew(UPRESET, xl_mmio + MMIO_COMMAND) ; 
      t=jiffies;
      while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { 
            schedule();       
            if(jiffies-t > 10*HZ) {
                  printk(KERN_ERR "%s: 3COM 3C359 Velocity XL-UPRESET not responding.\n", dev->name);
                  break ; 
            }
      }
      writew(DNRESET, xl_mmio + MMIO_COMMAND) ; 
      t=jiffies;
      while (readw(xl_mmio + MMIO_INTSTATUS) & INTSTAT_CMD_IN_PROGRESS) { 
            schedule();       
            if(jiffies-t > 10*HZ) {
                  printk(KERN_ERR "%s: 3COM 3C359 Velocity XL-DNRESET not responding.\n", dev->name);
                  break ; 
            }
      }
      xl_hw_reset(dev) ; 
      return 0 ;
}

static void xl_set_rx_mode(struct net_device *dev) 
{
      struct xl_private *xl_priv = netdev_priv(dev);
      struct dev_mc_list *dmi ; 
      unsigned char dev_mc_address[4] ; 
      u16 options ; 
      int i ; 

      if (dev->flags & IFF_PROMISC)
            options = 0x0004 ; 
      else
            options = 0x0000 ; 

      if (options ^ xl_priv->xl_copy_all_options) { /* Changed, must send command */
            xl_priv->xl_copy_all_options = options ; 
            xl_srb_cmd(dev, SET_RECEIVE_MODE) ;
            return ;  
      }

      dev_mc_address[0] = dev_mc_address[1] = dev_mc_address[2] = dev_mc_address[3] = 0 ;

        for (i=0,dmi=dev->mc_list;i < dev->mc_count; i++,dmi = dmi->next) {
                dev_mc_address[0] |= dmi->dmi_addr[2] ;
                dev_mc_address[1] |= dmi->dmi_addr[3] ;
                dev_mc_address[2] |= dmi->dmi_addr[4] ;
                dev_mc_address[3] |= dmi->dmi_addr[5] ;
        }

      if (memcmp(xl_priv->xl_functional_addr,dev_mc_address,4) != 0) { /* Options have changed, run the command */
            memcpy(xl_priv->xl_functional_addr, dev_mc_address,4) ; 
            xl_srb_cmd(dev, SET_FUNC_ADDRESS) ; 
      }
      return ; 
}


/*
 *    We issued an srb command and now we must read
 *    the response from the completed command.
 */

static void xl_srb_bh(struct net_device *dev) 
{ 
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      u8 srb_cmd, ret_code ; 
      int i ; 

      writel(MEM_BYTE_READ | 0xd0000 | xl_priv->srb, xl_mmio + MMIO_MAC_ACCESS_CMD) ;
      srb_cmd = readb(xl_mmio + MMIO_MACDATA) ; 
      writel((MEM_BYTE_READ | 0xd0000 | xl_priv->srb) +2, xl_mmio + MMIO_MAC_ACCESS_CMD) ;
      ret_code = readb(xl_mmio + MMIO_MACDATA) ; 

      /* Ret_code is standard across all commands */

      switch (ret_code) { 
      case 1:
            printk(KERN_INFO "%s: Command: %d - Invalid Command code\n",dev->name,srb_cmd) ; 
            break ; 
      case 4:
            printk(KERN_INFO "%s: Command: %d - Adapter is closed, must be open for this command \n",dev->name,srb_cmd) ; 
            break ;
      
      case 6:
            printk(KERN_INFO "%s: Command: %d - Options Invalid for command \n",dev->name,srb_cmd) ;
            break ;

      case 0: /* Successful command execution */ 
            switch (srb_cmd) { 
            case READ_LOG: /* Returns 14 bytes of data from the NIC */
                  if(xl_priv->xl_message_level)
                        printk(KERN_INFO "%s: READ.LOG 14 bytes of data ",dev->name) ; 
                  /* 
                   * We still have to read the log even if message_level = 0 and we don't want
                   * to see it
                   */
                  for (i=0;i<14;i++) { 
                        writel(MEM_BYTE_READ | 0xd0000 | xl_priv->srb | i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                        if(xl_priv->xl_message_level) 
                              printk("%02x:",readb(xl_mmio + MMIO_MACDATA)) ;       
                  } 
                  printk("\n") ; 
                  break ; 
            case SET_FUNC_ADDRESS:
                  if(xl_priv->xl_message_level) 
                        printk(KERN_INFO "%s: Functional Address Set \n",dev->name) ;  
                  break ; 
            case CLOSE_NIC:
                  if(xl_priv->xl_message_level)
                        printk(KERN_INFO "%s: Received CLOSE_NIC interrupt in interrupt handler \n",dev->name) ;  
                  break ; 
            case SET_MULTICAST_MODE:
                  if(xl_priv->xl_message_level)
                        printk(KERN_INFO "%s: Multicast options successfully changed\n",dev->name) ; 
                  break ;
            case SET_RECEIVE_MODE:
                  if(xl_priv->xl_message_level) {  
                        if (xl_priv->xl_copy_all_options == 0x0004) 
                              printk(KERN_INFO "%s: Entering promiscuous mode \n", dev->name) ; 
                        else
                              printk(KERN_INFO "%s: Entering normal receive mode \n",dev->name) ; 
                  }
                  break ; 
 
            } /* switch */
            break ; 
      } /* switch */
      return ;    
} 

static struct net_device_stats * xl_get_stats(struct net_device *dev)
{
      struct xl_private *xl_priv = netdev_priv(dev);
      return (struct net_device_stats *) &xl_priv->xl_stats; 
}

static int xl_set_mac_address (struct net_device *dev, void *addr) 
{
      struct sockaddr *saddr = addr ; 
      struct xl_private *xl_priv = netdev_priv(dev);

      if (netif_running(dev)) { 
            printk(KERN_WARNING "%s: Cannot set mac/laa address while card is open\n", dev->name) ; 
            return -EIO ; 
      }

      memcpy(xl_priv->xl_laa, saddr->sa_data,dev->addr_len) ; 
      
      if (xl_priv->xl_message_level) { 
            printk(KERN_INFO "%s: MAC/LAA Set to  = %x.%x.%x.%x.%x.%x\n",dev->name, xl_priv->xl_laa[0],
            xl_priv->xl_laa[1], xl_priv->xl_laa[2],
            xl_priv->xl_laa[3], xl_priv->xl_laa[4],
            xl_priv->xl_laa[5]);
      } 

      return 0 ; 
}

static void xl_arb_cmd(struct net_device *dev)
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      u8 arb_cmd ; 
      u16 lan_status, lan_status_diff ; 

      writel( ( MEM_BYTE_READ | 0xD0000 | xl_priv->arb), xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      arb_cmd = readb(xl_mmio + MMIO_MACDATA) ; 
      
      if (arb_cmd == RING_STATUS_CHANGE) { /* Ring.Status.Change */
            writel( ( (MEM_WORD_READ | 0xD0000 | xl_priv->arb) + 6), xl_mmio + MMIO_MAC_ACCESS_CMD) ;
             
            printk(KERN_INFO "%s: Ring Status Change: New Status = %04x\n", dev->name, swab16(readw(xl_mmio + MMIO_MACDATA) )) ;

            lan_status = swab16(readw(xl_mmio + MMIO_MACDATA));
      
            /* Acknowledge interrupt, this tells nic we are done with the arb */
            writel(ACK_INTERRUPT | ARBCACK | LATCH_ACK, xl_mmio + MMIO_COMMAND) ; 
                  
            lan_status_diff = xl_priv->xl_lan_status ^ lan_status ; 

            if (lan_status_diff & (LSC_LWF | LSC_ARW | LSC_FPE | LSC_RR) ) { 
                  if (lan_status_diff & LSC_LWF) 
                        printk(KERN_WARNING "%s: Short circuit detected on the lobe\n",dev->name);
                  if (lan_status_diff & LSC_ARW) 
                        printk(KERN_WARNING "%s: Auto removal error\n",dev->name);
                  if (lan_status_diff & LSC_FPE)
                        printk(KERN_WARNING "%s: FDX Protocol Error\n",dev->name);
                  if (lan_status_diff & LSC_RR) 
                        printk(KERN_WARNING "%s: Force remove MAC frame received\n",dev->name);
            
                  /* Adapter has been closed by the hardware */

                  netif_stop_queue(dev);
                  xl_freemem(dev) ; 
                  free_irq(dev->irq,dev);
                  
                  printk(KERN_WARNING "%s: Adapter has been closed \n", dev->name) ; 
            } /* If serious error */
            
            if (xl_priv->xl_message_level) { 
                  if (lan_status_diff & LSC_SIG_LOSS) 
                              printk(KERN_WARNING "%s: No receive signal detected \n", dev->name) ; 
                  if (lan_status_diff & LSC_HARD_ERR)
                              printk(KERN_INFO "%s: Beaconing \n",dev->name);
                  if (lan_status_diff & LSC_SOFT_ERR)
                              printk(KERN_WARNING "%s: Adapter transmitted Soft Error Report Mac Frame \n",dev->name);
                  if (lan_status_diff & LSC_TRAN_BCN) 
                              printk(KERN_INFO "%s: We are tranmitting the beacon, aaah\n",dev->name);
                  if (lan_status_diff & LSC_SS) 
                              printk(KERN_INFO "%s: Single Station on the ring \n", dev->name);
                  if (lan_status_diff & LSC_RING_REC)
                              printk(KERN_INFO "%s: Ring recovery ongoing\n",dev->name);
                  if (lan_status_diff & LSC_FDX_MODE)
                              printk(KERN_INFO "%s: Operating in FDX mode\n",dev->name);
            }     
            
            if (lan_status_diff & LSC_CO) { 
                        if (xl_priv->xl_message_level) 
                              printk(KERN_INFO "%s: Counter Overflow \n", dev->name);
                        /* Issue READ.LOG command */
                        xl_srb_cmd(dev, READ_LOG) ;   
            }

            /* There is no command in the tech docs to issue the read_sr_counters */
            if (lan_status_diff & LSC_SR_CO) { 
                  if (xl_priv->xl_message_level)
                        printk(KERN_INFO "%s: Source routing counters overflow\n", dev->name);
            }

            xl_priv->xl_lan_status = lan_status ; 
      
      }  /* Lan.change.status */
      else if ( arb_cmd == RECEIVE_DATA) { /* Received.Data */
#if XL_DEBUG
            printk(KERN_INFO "Received.Data \n") ; 
#endif            
            writel( ((MEM_WORD_READ | 0xD0000 | xl_priv->arb) + 6), xl_mmio + MMIO_MAC_ACCESS_CMD) ;
            xl_priv->mac_buffer = swab16(readw(xl_mmio + MMIO_MACDATA)) ;
            
            /* Now we are going to be really basic here and not do anything
             * with the data at all. The tech docs do not give me enough
             * information to calculate the buffers properly so we're
             * just going to tell the nic that we've dealt with the frame
             * anyway.
             */

            dev->last_rx = jiffies ; 
            /* Acknowledge interrupt, this tells nic we are done with the arb */
            writel(ACK_INTERRUPT | ARBCACK | LATCH_ACK, xl_mmio + MMIO_COMMAND) ; 

            /* Is the ASB free ? */       
                  
            xl_priv->asb_queued = 0 ;                 
            writel( ((MEM_BYTE_READ | 0xD0000 | xl_priv->asb) + 2), xl_mmio + MMIO_MAC_ACCESS_CMD) ;
            if (readb(xl_mmio + MMIO_MACDATA) != 0xff) { 
                  xl_priv->asb_queued = 1 ;

                  xl_wait_misr_flags(dev) ;  

                  writel(MEM_BYTE_WRITE | MF_ASBFR, xl_mmio + MMIO_MAC_ACCESS_CMD); 
                  writeb(0xff, xl_mmio + MMIO_MACDATA) ;
                  writel(MMIO_BYTE_WRITE | MISR_SET, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                  writeb(MISR_ASBFR, xl_mmio + MMIO_MACDATA) ; 
                  return ;    
                  /* Drop out and wait for the bottom half to be run */
            }
      
            xl_asb_cmd(dev) ; 
            
      } else {
            printk(KERN_WARNING "%s: Received unknown arb (xl_priv) command: %02x \n",dev->name,arb_cmd) ; 
      }

      /* Acknowledge the arb interrupt */

      writel(ACK_INTERRUPT | ARBCACK | LATCH_ACK , xl_mmio + MMIO_COMMAND) ; 

      return ; 
}


/*
 *    There is only one asb command, but we can get called from different
 *    places.
 */

static void xl_asb_cmd(struct net_device *dev)
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 

      if (xl_priv->asb_queued == 1) 
            writel(ACK_INTERRUPT | LATCH_ACK | ASBFACK, xl_mmio + MMIO_COMMAND) ; 
            
      writel(MEM_BYTE_WRITE | 0xd0000 | xl_priv->asb, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(0x81, xl_mmio + MMIO_MACDATA) ; 

      writel(MEM_WORD_WRITE | 0xd0000 | xl_priv->asb | 6, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writew(swab16(xl_priv->mac_buffer), xl_mmio + MMIO_MACDATA) ;

      xl_wait_misr_flags(dev) ;     

      writel(MEM_BYTE_WRITE | MF_RASB, xl_mmio + MMIO_MAC_ACCESS_CMD); 
      writeb(0xff, xl_mmio + MMIO_MACDATA) ;

      writel(MMIO_BYTE_WRITE | MISR_SET, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(MISR_RASB, xl_mmio + MMIO_MACDATA) ; 

      xl_priv->asb_queued = 2 ; 

      return ; 
}

/*
 *    This will only get called if there was an error
 *    from the asb cmd.
 */
static void xl_asb_bh(struct net_device *dev) 
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      u8 ret_code ; 

      writel(MMIO_BYTE_READ | 0xd0000 | xl_priv->asb | 2, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      ret_code = readb(xl_mmio + MMIO_MACDATA) ; 
      switch (ret_code) { 
            case 0x01:
                  printk(KERN_INFO "%s: ASB Command, unrecognized command code \n",dev->name) ;
                  break ;
            case 0x26:
                  printk(KERN_INFO "%s: ASB Command, unexpected receive buffer \n", dev->name) ; 
                  break ; 
            case 0x40:
                  printk(KERN_INFO "%s: ASB Command, Invalid Station ID \n", dev->name) ; 
                  break ;  
      }
      xl_priv->asb_queued = 0 ; 
      writel(ACK_INTERRUPT | LATCH_ACK | ASBFACK, xl_mmio + MMIO_COMMAND) ;
      return ;  
}

/*    
 *    Issue srb commands to the nic 
 */

static void xl_srb_cmd(struct net_device *dev, int srb_cmd) 
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 

      switch (srb_cmd) { 
      case READ_LOG:
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(READ_LOG, xl_mmio + MMIO_MACDATA) ; 
            break; 

      case CLOSE_NIC:
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(CLOSE_NIC, xl_mmio + MMIO_MACDATA) ; 
            break ;

      case SET_RECEIVE_MODE:
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(SET_RECEIVE_MODE, xl_mmio + MMIO_MACDATA) ; 
            writel(MEM_WORD_WRITE | 0xD0000 | xl_priv->srb | 4, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writew(xl_priv->xl_copy_all_options, xl_mmio + MMIO_MACDATA) ; 
            break ;

      case SET_FUNC_ADDRESS:
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(SET_FUNC_ADDRESS, xl_mmio + MMIO_MACDATA) ; 
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb | 6 , xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(xl_priv->xl_functional_addr[0], xl_mmio + MMIO_MACDATA) ; 
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb | 7 , xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(xl_priv->xl_functional_addr[1], xl_mmio + MMIO_MACDATA) ; 
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb | 8 , xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(xl_priv->xl_functional_addr[2], xl_mmio + MMIO_MACDATA) ; 
            writel(MEM_BYTE_WRITE | 0xD0000 | xl_priv->srb | 9 , xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
            writeb(xl_priv->xl_functional_addr[3], xl_mmio + MMIO_MACDATA) ;
            break ;  
      } /* switch */


      xl_wait_misr_flags(dev)  ; 

      /* Write 0xff to the CSRB flag */
      writel(MEM_BYTE_WRITE | MF_CSRB , xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(0xFF, xl_mmio + MMIO_MACDATA) ; 
      /* Set csrb bit in MISR register to process command */
      writel(MMIO_BYTE_WRITE | MISR_SET, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(MISR_CSRB, xl_mmio + MMIO_MACDATA) ; 
      xl_priv->srb_queued = 1 ; 

      return ; 
}

/*
 * This is nasty, to use the MISR command you have to wait for 6 memory locations
 * to be zero. This is the way the driver does on other OS'es so we should be ok with 
 * the empty loop.
 */

static void xl_wait_misr_flags(struct net_device *dev) 
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u8 __iomem * xl_mmio = xl_priv->xl_mmio ; 
      
      int i  ; 
      
      writel(MMIO_BYTE_READ | MISR_RW, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      if (readb(xl_mmio + MMIO_MACDATA) != 0) {  /* Misr not clear */
            for (i=0; i<6; i++) { 
                  writel(MEM_BYTE_READ | 0xDFFE0 | i, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
                  while (readb(xl_mmio + MMIO_MACDATA) != 0 ) {} ; /* Empty Loop */
            } 
      }

      writel(MMIO_BYTE_WRITE | MISR_AND, xl_mmio + MMIO_MAC_ACCESS_CMD) ; 
      writeb(0x80, xl_mmio + MMIO_MACDATA) ; 

      return ; 
} 

/*
 *    Change mtu size, this should work the same as olympic
 */

static int xl_change_mtu(struct net_device *dev, int mtu) 
{
      struct xl_private *xl_priv = netdev_priv(dev);
      u16 max_mtu ; 

      if (xl_priv->xl_ring_speed == 4)
            max_mtu = 4500 ; 
      else
            max_mtu = 18000 ; 
      
      if (mtu > max_mtu)
            return -EINVAL ; 
      if (mtu < 100) 
            return -EINVAL ; 

      dev->mtu = mtu ; 
      xl_priv->pkt_buf_sz = mtu + TR_HLEN ; 

      return 0 ; 
}

static void __devexit xl_remove_one (struct pci_dev *pdev)
{
      struct net_device *dev = pci_get_drvdata(pdev);
      struct xl_private *xl_priv=netdev_priv(dev);
      
      unregister_netdev(dev);
      iounmap(xl_priv->xl_mmio) ; 
      pci_release_regions(pdev) ; 
      pci_set_drvdata(pdev,NULL) ; 
      free_netdev(dev);
      return ; 
}

static struct pci_driver xl_3c359_driver = {
      .name       = "3c359",
      .id_table   = xl_pci_tbl,
      .probe            = xl_probe,
      .remove           = __devexit_p(xl_remove_one),
};

static int __init xl_pci_init (void)
{
      return pci_register_driver(&xl_3c359_driver);
}


static void __exit xl_pci_cleanup (void)
{
      pci_unregister_driver (&xl_3c359_driver);
}

module_init(xl_pci_init);
module_exit(xl_pci_cleanup);

MODULE_LICENSE("GPL") ; 

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