Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

[sfrench/cifs-2.6.git] / drivers / net / tokenring / 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/jiffies.h>
#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 <linux/firmware.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)" ; 

#define FW_NAME         "3com/3C359.bin"
MODULE_AUTHOR("Mike Phillips <mikep@linuxtr.net>") ; 
MODULE_DESCRIPTION("3Com 3C359 Velocity XL Token Ring Adapter Driver \n") ;
MODULE_FIRMWARE(FW_NAME);

/* 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") ;
/* 
 *      This is a real nasty way of doing this, but otherwise you
 *      will be stuck with 1555 lines of hex #'s in the code.
 */

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 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 const struct net_device_ops xl_netdev_ops = {
        .ndo_open               = xl_open,
        .ndo_stop               = xl_close,
        .ndo_start_xmit         = xl_xmit,
        .ndo_change_mtu         = xl_change_mtu,
        .ndo_set_multicast_list = xl_set_rx_mode,
        .ndo_set_mac_address    = xl_set_mac_address,
};
 
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 private data 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->netdev_ops = &xl_netdev_ops;
        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 xl_init_firmware(struct xl_private *xl_priv)
{
        int err;

        err = request_firmware(&xl_priv->fw, FW_NAME, &xl_priv->pdev->dev);
        if (err) {
                printk(KERN_ERR "Failed to load firmware \"%s\"\n", FW_NAME);
                return err;
        }

        if (xl_priv->fw->size < 16) {
                printk(KERN_ERR "Bogus length %zu in \"%s\"\n",
                       xl_priv->fw->size, FW_NAME);
                release_firmware(xl_priv->fw);
                err = -EINVAL;
        }

        return err;
}

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

        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) ; 

        err = xl_init_firmware(xl_priv);
        if (err == 0)
                err = xl_hw_reset(dev);

        return err;
}


/* 
 *      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 ;

        if (xl_priv->fw == NULL)
                return -EINVAL;

        /*
         *  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 (time_after(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
                 *
                 * Looks strange but ensures compiler only uses
                 * 16 bit unsigned int
                 */
                start = (0xFFFF - (xl_priv->fw->size) + 1) ;

                printk(KERN_INFO "3C359: Uploading Microcode: "); 

                for (i = start, j = 0; j < xl_priv->fw->size; i++, j++) {
                        writel(MEM_BYTE_WRITE | 0XD0000 | i,
                               xl_mmio + MMIO_MAC_ACCESS_CMD);
                        writeb(xl_priv->fw->data[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(xl_priv->fw->data[xl_priv->fw->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 (time_after(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 tx 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_rx_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) ; 
                kfree(xl_priv->xl_tx_ring);
                kfree(xl_priv->xl_rx_ring);
                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 (time_after(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 :) */ 
                                dev->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) ; 
                                dev->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) ; 
                        dev->stats.rx_packets++ ; 
                        dev->stats.rx_bytes += frame_length ;   

                        netif_rx(skb2) ;                
                 } /* if multiple buffers */
        } /* 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 (time_after(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 ; 
                dev->stats.tx_packets++ ; 
                dev->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 (time_after(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 (time_after(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 (time_after(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 (time_after(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 (time_after(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 (time_after(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 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.
                 */

                /* 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);
        
        release_firmware(xl_priv->fw);
        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") ;