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tms380tr.c

/*
 *  tms380tr.c: A network driver library for Texas Instruments TMS380-based
 *              Token Ring Adapters.
 *
 *  Originally sktr.c: Written 1997 by Christoph Goos
 *
 *  A fine result of the Linux Systems Network Architecture Project.
 *  http://www.linux-sna.org
 *
 *  This software may be used and distributed according to the terms
 *  of the GNU General Public License, incorporated herein by reference.
 *
 *  The following modules are currently available for card support:
 *    - tmspci (Generic PCI card support)
 *    - abyss (Madge PCI support)
 *      - tmsisa (SysKonnect TR4/16 ISA)
 *
 *  Sources:
 *    - The hardware related parts of this driver are take from
 *      the SysKonnect Token Ring driver for Windows NT.
 *    - I used the IBM Token Ring driver 'ibmtr.c' as a base for this
 *      driver, as well as the 'skeleton.c' driver by Donald Becker.
 *    - Also various other drivers in the linux source tree were taken
 *      as samples for some tasks.
 *      - TI TMS380 Second-Generation Token Ring User's Guide
 *    - TI datasheets for respective chips
 *    - David Hein at Texas Instruments 
 *    - Various Madge employees
 *
 *  Maintainer(s):
 *    JS    Jay Schulist            jschlst@samba.org
 *    CG    Christoph Goos          cgoos@syskonnect.de
 *    AF    Adam Fritzler           mid@auk.cx
 *    MLP       Mike Phillips           phillim@amtrak.com
 *    JF    Jochen Friedrich  jochen@scram.de
 *     
 *  Modification History:
 *    29-Aug-97   CG    Created
 *    04-Apr-98   CG    Fixed problems caused by tok_timer_check
 *    10-Apr-98   CG    Fixed lockups at cable disconnection
 *    27-May-98   JS    Formated to Linux Kernel Format
 *    31-May-98   JS    Hacked in PCI support
 *    16-Jun-98   JS    Modulized for multiple cards with one driver
 *       Sep-99   AF    Renamed to tms380tr (supports more than SK's)
 *      23-Sep-99 AF      Added Compaq and Thomas-Conrad PCI support
 *                      Fixed a bug causing double copies on PCI
 *                      Fixed for new multicast stuff (2.2/2.3)
 *    25-Sep-99   AF    Uped TPL_NUM from 3 to 9
 *                      Removed extraneous 'No free TPL'
 *    22-Dec-99   AF    Added Madge PCI Mk2 support and generalized
 *                      parts of the initilization procedure.
 *    30-Dec-99   AF    Turned tms380tr into a library ala 8390.
 *                      Madge support is provided in the abyss module
 *                      Generic PCI support is in the tmspci module.
 *    30-Nov-00   JF    Updated PCI code to support IO MMU via
 *                      pci_map_static(). Alpha uses this MMU for ISA
 *                      as well.
 *      14-Jan-01 JF    Fix DMA on ifdown/ifup sequences. Some 
 *                      cleanup.
 *    13-Jan-02   JF    Add spinlock to fix race condition.
 *    09-Nov-02   JF    Fixed printks to not SPAM the console during
 *                      normal operation.
 *    30-Dec-02   JF    Removed incorrect __init from 
 *                      tms380tr_init_card.
 *    22-Jul-05   JF    Converted to dma-mapping.
 *                      
 *  To do:
 *    1. Multi/Broadcast packet handling (this may have fixed itself)
 *    2. Write a sktrisa module that includes the old ISA support (done)
 *    3. Allow modules to load their own microcode
 *    4. Speed up the BUD process -- freezing the kernel for 3+sec is
 *         quite unacceptable.
 *    5. Still a few remaining stalls when the cable is unplugged.
 */

#ifdef MODULE
static const char version[] = "tms380tr.c: v1.10 30/12/2002 by Christoph Goos, Adam Fritzler\n";
#endif

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/trdevice.h>
#include <linux/firmware.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

#include "tms380tr.h"         /* Our Stuff */

/* Use 0 for production, 1 for verification, 2 for debug, and
 * 3 for very verbose debug.
 */
#ifndef TMS380TR_DEBUG
#define TMS380TR_DEBUG 0
#endif
static unsigned int tms380tr_debug = TMS380TR_DEBUG;

/* Index to functions, as function prototypes.
 * Alphabetical by function name.
 */

/* "A" */
/* "B" */
static int      tms380tr_bringup_diags(struct net_device *dev);
/* "C" */
static void tms380tr_cancel_tx_queue(struct net_local* tp);
static int  tms380tr_chipset_init(struct net_device *dev);
static void       tms380tr_chk_irq(struct net_device *dev);
static void       tms380tr_chk_outstanding_cmds(struct net_device *dev);
static void       tms380tr_chk_src_addr(unsigned char *frame, unsigned char *hw_addr);
static unsigned char tms380tr_chk_ssb(struct net_local *tp, unsigned short IrqType);
int         tms380tr_close(struct net_device *dev);
static void       tms380tr_cmd_status_irq(struct net_device *dev);
/* "D" */
static void       tms380tr_disable_interrupts(struct net_device *dev);
#if TMS380TR_DEBUG > 0
static void       tms380tr_dump(unsigned char *Data, int length);
#endif
/* "E" */
static void       tms380tr_enable_interrupts(struct net_device *dev);
static void       tms380tr_exec_cmd(struct net_device *dev, unsigned short Command);
static void       tms380tr_exec_sifcmd(struct net_device *dev, unsigned int WriteValue);
/* "F" */
/* "G" */
static struct net_device_stats *tms380tr_get_stats(struct net_device *dev);
/* "H" */
static int  tms380tr_hardware_send_packet(struct sk_buff *skb,
                  struct net_device *dev);
/* "I" */
static int  tms380tr_init_adapter(struct net_device *dev);
static void       tms380tr_init_ipb(struct net_local *tp);
static void       tms380tr_init_net_local(struct net_device *dev);
static void       tms380tr_init_opb(struct net_device *dev);
/* "M" */
/* "O" */
int         tms380tr_open(struct net_device *dev);
static void tms380tr_open_adapter(struct net_device *dev);
/* "P" */
/* "R" */
static void       tms380tr_rcv_status_irq(struct net_device *dev);
static int  tms380tr_read_ptr(struct net_device *dev);
static void       tms380tr_read_ram(struct net_device *dev, unsigned char *Data,
                  unsigned short Address, int Length);
static int  tms380tr_reset_adapter(struct net_device *dev);
static void       tms380tr_reset_interrupt(struct net_device *dev);
static void       tms380tr_ring_status_irq(struct net_device *dev);
/* "S" */
static int  tms380tr_send_packet(struct sk_buff *skb, struct net_device *dev);
static void       tms380tr_set_multicast_list(struct net_device *dev);
static int  tms380tr_set_mac_address(struct net_device *dev, void *addr);
/* "T" */
static void       tms380tr_timer_chk(unsigned long data);
static void       tms380tr_timer_end_wait(unsigned long data);
static void       tms380tr_tx_status_irq(struct net_device *dev);
/* "U" */
static void       tms380tr_update_rcv_stats(struct net_local *tp,
                  unsigned char DataPtr[], unsigned int Length);
/* "W" */
void        tms380tr_wait(unsigned long time);
static void       tms380tr_write_rpl_status(RPL *rpl, unsigned int Status);
static void       tms380tr_write_tpl_status(TPL *tpl, unsigned int Status);

#define SIFREADB(reg) (((struct net_local *)dev->priv)->sifreadb(dev, reg))
#define SIFWRITEB(val, reg) (((struct net_local *)dev->priv)->sifwriteb(dev, val, reg))
#define SIFREADW(reg) (((struct net_local *)dev->priv)->sifreadw(dev, reg))
#define SIFWRITEW(val, reg) (((struct net_local *)dev->priv)->sifwritew(dev, val, reg))



#if 0 /* TMS380TR_DEBUG > 0 */
static int madgemc_sifprobe(struct net_device *dev)
{
        unsigned char old, chk1, chk2;
      
      old = SIFREADB(SIFADR);  /* Get the old SIFADR value */

        chk1 = 0;       /* Begin with check value 0 */
        do {
            madgemc_setregpage(dev, 0);
                /* Write new SIFADR value */
            SIFWRITEB(chk1, SIFADR);
            chk2 = SIFREADB(SIFADR);
            if (chk2 != chk1)
                  return -1;
            
            madgemc_setregpage(dev, 1);
                /* Read, invert and write */
            chk2 = SIFREADB(SIFADD);
            if (chk2 != chk1)
                  return -1;

            madgemc_setregpage(dev, 0);
                chk2 ^= 0x0FE;
            SIFWRITEB(chk2, SIFADR);

                /* Read, invert and compare */
            madgemc_setregpage(dev, 1);
            chk2 = SIFREADB(SIFADD);
            madgemc_setregpage(dev, 0);
                chk2 ^= 0x0FE;

                if(chk1 != chk2)
                        return (-1);    /* No adapter */
                chk1 -= 2;
        } while(chk1 != 0);     /* Repeat 128 times (all byte values) */

      madgemc_setregpage(dev, 0); /* sanity */
        /* Restore the SIFADR value */
      SIFWRITEB(old, SIFADR);

        return (0);
}
#endif

/*
 * Open/initialize the board. This is called sometime after
 * booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */
int tms380tr_open(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      int err;
      
      /* init the spinlock */
      spin_lock_init(&tp->lock);
      init_timer(&tp->timer);

      /* Reset the hardware here. Don't forget to set the station address. */

#ifdef CONFIG_ISA
      if(dev->dma > 0) 
      {
            unsigned long flags=claim_dma_lock();
            disable_dma(dev->dma);
            set_dma_mode(dev->dma, DMA_MODE_CASCADE);
            enable_dma(dev->dma);
            release_dma_lock(flags);
      }
#endif
      
      err = tms380tr_chipset_init(dev);
      if(err)
      {
            printk(KERN_INFO "%s: Chipset initialization error\n", 
                  dev->name);
            return (-1);
      }

      tp->timer.expires = jiffies + 30*HZ;
      tp->timer.function      = tms380tr_timer_end_wait;
      tp->timer.data          = (unsigned long)dev;
      add_timer(&tp->timer);

      printk(KERN_DEBUG "%s: Adapter RAM size: %dK\n", 
             dev->name, tms380tr_read_ptr(dev));

      tms380tr_enable_interrupts(dev);
      tms380tr_open_adapter(dev);

      netif_start_queue(dev);
      
      /* Wait for interrupt from hardware. If interrupt does not come,
       * there will be a timeout from the timer.
       */
      tp->Sleeping = 1;
      interruptible_sleep_on(&tp->wait_for_tok_int);
      del_timer(&tp->timer);

      /* If AdapterVirtOpenFlag is 1, the adapter is now open for use */
      if(tp->AdapterVirtOpenFlag == 0)
      {
            tms380tr_disable_interrupts(dev);
            return (-1);
      }

      tp->StartTime = jiffies;

      /* Start function control timer */
      tp->timer.expires = jiffies + 2*HZ;
      tp->timer.function      = tms380tr_timer_chk;
      tp->timer.data          = (unsigned long)dev;
      add_timer(&tp->timer);

      return (0);
}

/*
 * Timeout function while waiting for event
 */
static void tms380tr_timer_end_wait(unsigned long data)
{
      struct net_device *dev = (struct net_device*)data;
      struct net_local *tp = netdev_priv(dev);

      if(tp->Sleeping)
      {
            tp->Sleeping = 0;
            wake_up_interruptible(&tp->wait_for_tok_int);
      }

      return;
}

/*
 * Initialize the chipset
 */
static int tms380tr_chipset_init(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      int err;

      tms380tr_init_ipb(tp);
      tms380tr_init_opb(dev);
      tms380tr_init_net_local(dev);

      if(tms380tr_debug > 3)
            printk(KERN_DEBUG "%s: Resetting adapter...\n", dev->name);
      err = tms380tr_reset_adapter(dev);
      if(err < 0)
            return (-1);

      if(tms380tr_debug > 3)
            printk(KERN_DEBUG "%s: Bringup diags...\n", dev->name);
      err = tms380tr_bringup_diags(dev);
      if(err < 0)
            return (-1);

      if(tms380tr_debug > 3)
            printk(KERN_DEBUG "%s: Init adapter...\n", dev->name);
      err = tms380tr_init_adapter(dev);
      if(err < 0)
            return (-1);

      if(tms380tr_debug > 3)
            printk(KERN_DEBUG "%s: Done!\n", dev->name);
      return (0);
}

/*
 * Initializes the net_local structure.
 */
static void tms380tr_init_net_local(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      int i;
      dma_addr_t dmabuf;

      tp->scb.CMD = 0;
      tp->scb.Parm[0] = 0;
      tp->scb.Parm[1] = 0;

      tp->ssb.STS = 0;
      tp->ssb.Parm[0] = 0;
      tp->ssb.Parm[1] = 0;
      tp->ssb.Parm[2] = 0;

      tp->CMDqueue      = 0;

      tp->AdapterOpenFlag     = 0;
      tp->AdapterVirtOpenFlag = 0;
      tp->ScbInUse            = 0;
      tp->OpenCommandIssued   = 0;
      tp->ReOpenInProgress    = 0;
      tp->HaltInProgress      = 0;
      tp->TransmitHaltScheduled = 0;
      tp->LobeWireFaultLogged = 0;
      tp->LastOpenStatus      = 0;
      tp->MaxPacketSize = DEFAULT_PACKET_SIZE;

      /* Create circular chain of transmit lists */
      for (i = 0; i < TPL_NUM; i++)
      {
            tp->Tpl[i].NextTPLAddr = htonl(((char *)(&tp->Tpl[(i+1) % TPL_NUM]) - (char *)tp) + tp->dmabuffer); /* DMA buffer may be MMU driven */
            tp->Tpl[i].Status = 0;
            tp->Tpl[i].FrameSize    = 0;
            tp->Tpl[i].FragList[0].DataCount    = 0;
            tp->Tpl[i].FragList[0].DataAddr           = 0;
            tp->Tpl[i].NextTPLPtr   = &tp->Tpl[(i+1) % TPL_NUM];
            tp->Tpl[i].MData  = NULL;
            tp->Tpl[i].TPLIndex     = i;
            tp->Tpl[i].DMABuff      = 0;
            tp->Tpl[i].BusyFlag     = 0;
      }

      tp->TplFree = tp->TplBusy = &tp->Tpl[0];

      /* Create circular chain of receive lists */
      for (i = 0; i < RPL_NUM; i++)
      {
            tp->Rpl[i].NextRPLAddr = htonl(((char *)(&tp->Rpl[(i+1) % RPL_NUM]) - (char *)tp) + tp->dmabuffer); /* DMA buffer may be MMU driven */
            tp->Rpl[i].Status = (RX_VALID | RX_START_FRAME | RX_END_FRAME | RX_FRAME_IRQ);
            tp->Rpl[i].FrameSize = 0;
            tp->Rpl[i].FragList[0].DataCount = cpu_to_be16((unsigned short)tp->MaxPacketSize);

            /* Alloc skb and point adapter to data area */
            tp->Rpl[i].Skb = dev_alloc_skb(tp->MaxPacketSize);
                  tp->Rpl[i].DMABuff = 0;

            /* skb == NULL ? then use local buffer */
            if(tp->Rpl[i].Skb == NULL)
            {
                  tp->Rpl[i].SkbStat = SKB_UNAVAILABLE;
                  tp->Rpl[i].FragList[0].DataAddr = htonl(((char *)tp->LocalRxBuffers[i] - (char *)tp) + tp->dmabuffer);
                  tp->Rpl[i].MData = tp->LocalRxBuffers[i];
            }
            else  /* SKB != NULL */
            {
                  tp->Rpl[i].Skb->dev = dev;
                  skb_put(tp->Rpl[i].Skb, tp->MaxPacketSize);

                  /* data unreachable for DMA ? then use local buffer */
                  dmabuf = dma_map_single(tp->pdev, tp->Rpl[i].Skb->data, tp->MaxPacketSize, DMA_FROM_DEVICE);
                  if(tp->dmalimit && (dmabuf + tp->MaxPacketSize > tp->dmalimit))
                  {
                        tp->Rpl[i].SkbStat = SKB_DATA_COPY;
                        tp->Rpl[i].FragList[0].DataAddr = htonl(((char *)tp->LocalRxBuffers[i] - (char *)tp) + tp->dmabuffer);
                        tp->Rpl[i].MData = tp->LocalRxBuffers[i];
                  }
                  else  /* DMA directly in skb->data */
                  {
                        tp->Rpl[i].SkbStat = SKB_DMA_DIRECT;
                        tp->Rpl[i].FragList[0].DataAddr = htonl(dmabuf);
                        tp->Rpl[i].MData = tp->Rpl[i].Skb->data;
                        tp->Rpl[i].DMABuff = dmabuf;
                  }
            }

            tp->Rpl[i].NextRPLPtr = &tp->Rpl[(i+1) % RPL_NUM];
            tp->Rpl[i].RPLIndex = i;
      }

      tp->RplHead = &tp->Rpl[0];
      tp->RplTail = &tp->Rpl[RPL_NUM-1];
      tp->RplTail->Status = (RX_START_FRAME | RX_END_FRAME | RX_FRAME_IRQ);

      return;
}

/*
 * Initializes the initialisation parameter block.
 */
static void tms380tr_init_ipb(struct net_local *tp)
{
      tp->ipb.Init_Options    = BURST_MODE;
      tp->ipb.CMD_Status_IV   = 0;
      tp->ipb.TX_IV           = 0;
      tp->ipb.RX_IV           = 0;
      tp->ipb.Ring_Status_IV  = 0;
      tp->ipb.SCB_Clear_IV    = 0;
      tp->ipb.Adapter_CHK_IV  = 0;
      tp->ipb.RX_Burst_Size   = BURST_SIZE;
      tp->ipb.TX_Burst_Size   = BURST_SIZE;
      tp->ipb.DMA_Abort_Thrhld = DMA_RETRIES;
      tp->ipb.SCB_Addr  = 0;
      tp->ipb.SSB_Addr  = 0;

      return;
}

/*
 * Initializes the open parameter block.
 */
static void tms380tr_init_opb(struct net_device *dev)
{
      struct net_local *tp;
      unsigned long Addr;
      unsigned short RplSize    = RPL_SIZE;
      unsigned short TplSize    = TPL_SIZE;
      unsigned short BufferSize = BUFFER_SIZE;
      int i;

      tp = netdev_priv(dev);

      tp->ocpl.OPENOptions     = 0;
      tp->ocpl.OPENOptions    |= ENABLE_FULL_DUPLEX_SELECTION;
      tp->ocpl.FullDuplex      = 0;
      tp->ocpl.FullDuplex     |= OPEN_FULL_DUPLEX_OFF;

        /* 
       * Set node address 
       *
       * We go ahead and put it in the OPB even though on
       * most of the generic adapters this isn't required.
       * Its simpler this way.  -- ASF
       */
        for (i=0;i<6;i++)
                tp->ocpl.NodeAddr[i] = ((unsigned char *)dev->dev_addr)[i];

      tp->ocpl.GroupAddr       = 0;
      tp->ocpl.FunctAddr       = 0;
      tp->ocpl.RxListSize      = cpu_to_be16((unsigned short)RplSize);
      tp->ocpl.TxListSize      = cpu_to_be16((unsigned short)TplSize);
      tp->ocpl.BufSize   = cpu_to_be16((unsigned short)BufferSize);
      tp->ocpl.Reserved  = 0;
      tp->ocpl.TXBufMin  = TX_BUF_MIN;
      tp->ocpl.TXBufMax  = TX_BUF_MAX;

      Addr = htonl(((char *)tp->ProductID - (char *)tp) + tp->dmabuffer);

      tp->ocpl.ProdIDAddr[0]   = LOWORD(Addr);
      tp->ocpl.ProdIDAddr[1]   = HIWORD(Addr);

      return;
}

/*
 * Send OPEN command to adapter
 */
static void tms380tr_open_adapter(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);

      if(tp->OpenCommandIssued)
            return;

      tp->OpenCommandIssued = 1;
      tms380tr_exec_cmd(dev, OC_OPEN);

      return;
}

/*
 * Clear the adapter's interrupt flag. Clear system interrupt enable
 * (SINTEN): disable adapter to system interrupts.
 */
static void tms380tr_disable_interrupts(struct net_device *dev)
{
      SIFWRITEB(0, SIFACL);

      return;
}

/*
 * Set the adapter's interrupt flag. Set system interrupt enable
 * (SINTEN): enable adapter to system interrupts.
 */
static void tms380tr_enable_interrupts(struct net_device *dev)
{
      SIFWRITEB(ACL_SINTEN, SIFACL);

      return;
}

/*
 * Put command in command queue, try to execute it.
 */
static void tms380tr_exec_cmd(struct net_device *dev, unsigned short Command)
{
      struct net_local *tp = netdev_priv(dev);

      tp->CMDqueue |= Command;
      tms380tr_chk_outstanding_cmds(dev);

      return;
}

static void tms380tr_timeout(struct net_device *dev)
{
      /*
       * If we get here, some higher level has decided we are broken.
       * There should really be a "kick me" function call instead.
       *
       * Resetting the token ring adapter takes a long time so just
       * fake transmission time and go on trying. Our own timeout
       * routine is in tms380tr_timer_chk()
       */
      dev->trans_start = jiffies;
      netif_wake_queue(dev);
}

/*
 * Gets skb from system, queues it and checks if it can be sent
 */
static int tms380tr_send_packet(struct sk_buff *skb, struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      int err;

      err = tms380tr_hardware_send_packet(skb, dev);
      if(tp->TplFree->NextTPLPtr->BusyFlag)
            netif_stop_queue(dev);
      return (err);
}

/*
 * Move frames into adapter tx queue
 */
static int tms380tr_hardware_send_packet(struct sk_buff *skb, struct net_device *dev)
{
      TPL *tpl;
      short length;
      unsigned char *buf;
      unsigned long flags;
      int i;
      dma_addr_t dmabuf, newbuf;
      struct net_local *tp = netdev_priv(dev);
   
      /* Try to get a free TPL from the chain.
       *
       * NOTE: We *must* always leave one unused TPL in the chain,
       * because otherwise the adapter might send frames twice.
       */
      spin_lock_irqsave(&tp->lock, flags);
      if(tp->TplFree->NextTPLPtr->BusyFlag)  { /* No free TPL */
            if (tms380tr_debug > 0)
                  printk(KERN_DEBUG "%s: No free TPL\n", dev->name);
            spin_unlock_irqrestore(&tp->lock, flags);
            return 1;
      }

      dmabuf = 0;

      /* Is buffer reachable for Busmaster-DMA? */

      length      = skb->len;
      dmabuf = dma_map_single(tp->pdev, skb->data, length, DMA_TO_DEVICE);
      if(tp->dmalimit && (dmabuf + length > tp->dmalimit)) {
            /* Copy frame to local buffer */
            dma_unmap_single(tp->pdev, dmabuf, length, DMA_TO_DEVICE);
            dmabuf  = 0;
            i     = tp->TplFree->TPLIndex;
            buf   = tp->LocalTxBuffers[i];
            skb_copy_from_linear_data(skb, buf, length);
            newbuf      = ((char *)buf - (char *)tp) + tp->dmabuffer;
      }
      else {
            /* Send direct from skb->data */
            newbuf      = dmabuf;
            buf   = skb->data;
      }
      /* Source address in packet? */
      tms380tr_chk_src_addr(buf, dev->dev_addr);
      tp->LastSendTime  = jiffies;
      tpl               = tp->TplFree;    /* Get the "free" TPL */
      tpl->BusyFlag           = 1;        /* Mark TPL as busy */
      tp->TplFree             = tpl->NextTPLPtr;
    
      /* Save the skb for delayed return of skb to system */
      tpl->Skb = skb;
      tpl->DMABuff = dmabuf;
      tpl->FragList[0].DataCount = cpu_to_be16((unsigned short)length);
      tpl->FragList[0].DataAddr  = htonl(newbuf);

      /* Write the data length in the transmit list. */
      tpl->FrameSize    = cpu_to_be16((unsigned short)length);
      tpl->MData  = buf;

      /* Transmit the frame and set the status values. */
      tms380tr_write_tpl_status(tpl, TX_VALID | TX_START_FRAME
                        | TX_END_FRAME | TX_PASS_SRC_ADDR
                        | TX_FRAME_IRQ);

      /* Let adapter send the frame. */
      tms380tr_exec_sifcmd(dev, CMD_TX_VALID);
      spin_unlock_irqrestore(&tp->lock, flags);

      return 0;
}

/*
 * Write the given value to the 'Status' field of the specified TPL.
 * NOTE: This function should be used whenever the status of any TPL must be
 * modified by the driver, because the compiler may otherwise change the
 * order of instructions such that writing the TPL status may be executed at
 * an undesireable time. When this function is used, the status is always
 * written when the function is called.
 */
static void tms380tr_write_tpl_status(TPL *tpl, unsigned int Status)
{
      tpl->Status = Status;
}

static void tms380tr_chk_src_addr(unsigned char *frame, unsigned char *hw_addr)
{
      unsigned char SRBit;

      if((((unsigned long)frame[8]) & ~0x80) != 0)    /* Compare 4 bytes */
            return;
      if((unsigned short)frame[12] != 0)        /* Compare 2 bytes */
            return;

      SRBit = frame[8] & 0x80;
      memcpy(&frame[8], hw_addr, 6);
      frame[8] |= SRBit;

      return;
}

/*
 * The timer routine: Check if adapter still open and working, reopen if not. 
 */
static void tms380tr_timer_chk(unsigned long data)
{
      struct net_device *dev = (struct net_device*)data;
      struct net_local *tp = netdev_priv(dev);

      if(tp->HaltInProgress)
            return;

      tms380tr_chk_outstanding_cmds(dev);
      if(time_before(tp->LastSendTime + SEND_TIMEOUT, jiffies)
            && (tp->TplFree != tp->TplBusy))
      {
            /* Anything to send, but stalled too long */
            tp->LastSendTime = jiffies;
            tms380tr_exec_cmd(dev, OC_CLOSE);   /* Does reopen automatically */
      }

      tp->timer.expires = jiffies + 2*HZ;
      add_timer(&tp->timer);

      if(tp->AdapterOpenFlag || tp->ReOpenInProgress)
            return;
      tp->ReOpenInProgress = 1;
      tms380tr_open_adapter(dev);

      return;
}

/*
 * The typical workload of the driver: Handle the network interface interrupts.
 */
irqreturn_t tms380tr_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct net_local *tp;
      unsigned short irq_type;
      int handled = 0;

      tp = netdev_priv(dev);

      irq_type = SIFREADW(SIFSTS);

      while(irq_type & STS_SYSTEM_IRQ) {
            handled = 1;
            irq_type &= STS_IRQ_MASK;

            if(!tms380tr_chk_ssb(tp, irq_type)) {
                  printk(KERN_DEBUG "%s: DATA LATE occurred\n", dev->name);
                  break;
            }

            switch(irq_type) {
            case STS_IRQ_RECEIVE_STATUS:
                  tms380tr_reset_interrupt(dev);
                  tms380tr_rcv_status_irq(dev);
                  break;

            case STS_IRQ_TRANSMIT_STATUS:
                  /* Check if TRANSMIT.HALT command is complete */
                  if(tp->ssb.Parm[0] & COMMAND_COMPLETE) {
                        tp->TransmitCommandActive = 0;
                              tp->TransmitHaltScheduled = 0;

                              /* Issue a new transmit command. */
                              tms380tr_exec_cmd(dev, OC_TRANSMIT);
                        }

                        tms380tr_reset_interrupt(dev);
                        tms380tr_tx_status_irq(dev);
                        break;

            case STS_IRQ_COMMAND_STATUS:
                  /* The SSB contains status of last command
                   * other than receive/transmit.
                   */
                  tms380tr_cmd_status_irq(dev);
                  break;
                  
            case STS_IRQ_SCB_CLEAR:
                  /* The SCB is free for another command. */
                  tp->ScbInUse = 0;
                  tms380tr_chk_outstanding_cmds(dev);
                  break;
                  
            case STS_IRQ_RING_STATUS:
                  tms380tr_ring_status_irq(dev);
                  break;

            case STS_IRQ_ADAPTER_CHECK:
                  tms380tr_chk_irq(dev);
                  break;

            case STS_IRQ_LLC_STATUS:
                  printk(KERN_DEBUG "tms380tr: unexpected LLC status IRQ\n");
                  break;
                  
            case STS_IRQ_TIMER:
                  printk(KERN_DEBUG "tms380tr: unexpected Timer IRQ\n");
                  break;
                  
            case STS_IRQ_RECEIVE_PENDING:
                  printk(KERN_DEBUG "tms380tr: unexpected Receive Pending IRQ\n");
                  break;
                  
            default:
                  printk(KERN_DEBUG "Unknown Token Ring IRQ (0x%04x)\n", irq_type);
                  break;
            }

            /* Reset system interrupt if not already done. */
            if(irq_type != STS_IRQ_TRANSMIT_STATUS
                  && irq_type != STS_IRQ_RECEIVE_STATUS) {
                  tms380tr_reset_interrupt(dev);
            }

            irq_type = SIFREADW(SIFSTS);
      }

      return IRQ_RETVAL(handled);
}

/*
 *  Reset the INTERRUPT SYSTEM bit and issue SSB CLEAR command.
 */
static void tms380tr_reset_interrupt(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      SSB *ssb = &tp->ssb;

      /*
       * [Workaround for "Data Late"]
       * Set all fields of the SSB to well-defined values so we can
       * check if the adapter has written the SSB.
       */

      ssb->STS    = (unsigned short) -1;
      ssb->Parm[0]      = (unsigned short) -1;
      ssb->Parm[1]      = (unsigned short) -1;
      ssb->Parm[2]      = (unsigned short) -1;

      /* Free SSB by issuing SSB_CLEAR command after reading IRQ code
       * and clear STS_SYSTEM_IRQ bit: enable adapter for further interrupts.
       */
      tms380tr_exec_sifcmd(dev, CMD_SSB_CLEAR | CMD_CLEAR_SYSTEM_IRQ);

      return;
}

/*
 * Check if the SSB has actually been written by the adapter.
 */
static unsigned char tms380tr_chk_ssb(struct net_local *tp, unsigned short IrqType)
{
      SSB *ssb = &tp->ssb;    /* The address of the SSB. */

      /* C 0 1 2 INTERRUPT CODE
       * - - - - --------------
       * 1 1 1 1 TRANSMIT STATUS
       * 1 1 1 1 RECEIVE STATUS
       * 1 ? ? 0 COMMAND STATUS
       * 0 0 0 0 SCB CLEAR
       * 1 1 0 0 RING STATUS
       * 0 0 0 0 ADAPTER CHECK
       *
       * 0 = SSB field not affected by interrupt
       * 1 = SSB field is affected by interrupt
       *
       * C = SSB ADDRESS +0: COMMAND
       * 0 = SSB ADDRESS +2: STATUS 0
       * 1 = SSB ADDRESS +4: STATUS 1
       * 2 = SSB ADDRESS +6: STATUS 2
       */

      /* Check if this interrupt does use the SSB. */

      if(IrqType != STS_IRQ_TRANSMIT_STATUS
            && IrqType != STS_IRQ_RECEIVE_STATUS
            && IrqType != STS_IRQ_COMMAND_STATUS
            && IrqType != STS_IRQ_RING_STATUS)
      {
            return (1); /* SSB not involved. */
      }

      /* Note: All fields of the SSB have been set to all ones (-1) after it
       * has last been used by the software (see DriverIsr()).
       *
       * Check if the affected SSB fields are still unchanged.
       */

      if(ssb->STS == (unsigned short) -1)
            return (0); /* Command field not yet available. */
      if(IrqType == STS_IRQ_COMMAND_STATUS)
            return (1); /* Status fields not always affected. */
      if(ssb->Parm[0] == (unsigned short) -1)
            return (0); /* Status 1 field not yet available. */
      if(IrqType == STS_IRQ_RING_STATUS)
            return (1); /* Status 2 & 3 fields not affected. */

      /* Note: At this point, the interrupt is either TRANSMIT or RECEIVE. */
      if(ssb->Parm[1] == (unsigned short) -1)
            return (0); /* Status 2 field not yet available. */
      if(ssb->Parm[2] == (unsigned short) -1)
            return (0); /* Status 3 field not yet available. */

      return (1); /* All SSB fields have been written by the adapter. */
}

/*
 * Evaluates the command results status in the SSB status field.
 */
static void tms380tr_cmd_status_irq(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      unsigned short ssb_cmd, ssb_parm_0;
      unsigned short ssb_parm_1;
      char *open_err = "Open error -";
      char *code_err = "Open code -";

      /* Copy the ssb values to local variables */
      ssb_cmd    = tp->ssb.STS;
      ssb_parm_0 = tp->ssb.Parm[0];
      ssb_parm_1 = tp->ssb.Parm[1];

      if(ssb_cmd == OPEN)
      {
            tp->Sleeping = 0;
            if(!tp->ReOpenInProgress)
                  wake_up_interruptible(&tp->wait_for_tok_int);

            tp->OpenCommandIssued = 0;
            tp->ScbInUse = 0;

            if((ssb_parm_0 & 0x00FF) == GOOD_COMPLETION)
            {
                  /* Success, the adapter is open. */
                  tp->LobeWireFaultLogged = 0;
                  tp->AdapterOpenFlag     = 1;
                  tp->AdapterVirtOpenFlag = 1;
                  tp->TransmitCommandActive = 0;
                  tms380tr_exec_cmd(dev, OC_TRANSMIT);
                  tms380tr_exec_cmd(dev, OC_RECEIVE);

                  if(tp->ReOpenInProgress)
                        tp->ReOpenInProgress = 0;

                  return;
            }
            else  /* The adapter did not open. */
            {
                  if(ssb_parm_0 & NODE_ADDR_ERROR)
                        printk(KERN_INFO "%s: Node address error\n",
                              dev->name);
                  if(ssb_parm_0 & LIST_SIZE_ERROR)
                        printk(KERN_INFO "%s: List size error\n",
                              dev->name);
                  if(ssb_parm_0 & BUF_SIZE_ERROR)
                        printk(KERN_INFO "%s: Buffer size error\n",
                              dev->name);
                  if(ssb_parm_0 & TX_BUF_COUNT_ERROR)
                        printk(KERN_INFO "%s: Tx buffer count error\n",
                              dev->name);
                  if(ssb_parm_0 & INVALID_OPEN_OPTION)
                        printk(KERN_INFO "%s: Invalid open option\n",
                              dev->name);
                  if(ssb_parm_0 & OPEN_ERROR)
                  {
                        /* Show the open phase. */
                        switch(ssb_parm_0 & OPEN_PHASES_MASK)
                        {
                              case LOBE_MEDIA_TEST:
                                    if(!tp->LobeWireFaultLogged)
                                    {
                                          tp->LobeWireFaultLogged = 1;
                                          printk(KERN_INFO "%s: %s Lobe wire fault (check cable !).\n", dev->name, open_err);
                                    }
                                    tp->ReOpenInProgress    = 1;
                                    tp->AdapterOpenFlag     = 0;
                                    tp->AdapterVirtOpenFlag = 1;
                                    tms380tr_open_adapter(dev);
                                    return;

                              case PHYSICAL_INSERTION:
                                    printk(KERN_INFO "%s: %s Physical insertion.\n", dev->name, open_err);
                                    break;

                              case ADDRESS_VERIFICATION:
                                    printk(KERN_INFO "%s: %s Address verification.\n", dev->name, open_err);
                                    break;

                              case PARTICIPATION_IN_RING_POLL:
                                    printk(KERN_INFO "%s: %s Participation in ring poll.\n", dev->name, open_err);
                                    break;

                              case REQUEST_INITIALISATION:
                                    printk(KERN_INFO "%s: %s Request initialisation.\n", dev->name, open_err);
                                    break;

                              case FULLDUPLEX_CHECK:
                                    printk(KERN_INFO "%s: %s Full duplex check.\n", dev->name, open_err);
                                    break;

                              default:
                                    printk(KERN_INFO "%s: %s Unknown open phase\n", dev->name, open_err);
                                    break;
                        }

                        /* Show the open errors. */
                        switch(ssb_parm_0 & OPEN_ERROR_CODES_MASK)
                        {
                              case OPEN_FUNCTION_FAILURE:
                                    printk(KERN_INFO "%s: %s OPEN_FUNCTION_FAILURE", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_FUNCTION_FAILURE;
                                    break;

                              case OPEN_SIGNAL_LOSS:
                                    printk(KERN_INFO "%s: %s OPEN_SIGNAL_LOSS\n", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_SIGNAL_LOSS;
                                    break;

                              case OPEN_TIMEOUT:
                                    printk(KERN_INFO "%s: %s OPEN_TIMEOUT\n", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_TIMEOUT;
                                    break;

                              case OPEN_RING_FAILURE:
                                    printk(KERN_INFO "%s: %s OPEN_RING_FAILURE\n", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_RING_FAILURE;
                                    break;

                              case OPEN_RING_BEACONING:
                                    printk(KERN_INFO "%s: %s OPEN_RING_BEACONING\n", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_RING_BEACONING;
                                    break;

                              case OPEN_DUPLICATE_NODEADDR:
                                    printk(KERN_INFO "%s: %s OPEN_DUPLICATE_NODEADDR\n", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_DUPLICATE_NODEADDR;
                                    break;

                              case OPEN_REQUEST_INIT:
                                    printk(KERN_INFO "%s: %s OPEN_REQUEST_INIT\n", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_REQUEST_INIT;
                                    break;

                              case OPEN_REMOVE_RECEIVED:
                                    printk(KERN_INFO "%s: %s OPEN_REMOVE_RECEIVED", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_REMOVE_RECEIVED;
                                    break;

                              case OPEN_FULLDUPLEX_SET:
                                    printk(KERN_INFO "%s: %s OPEN_FULLDUPLEX_SET\n", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_FULLDUPLEX_SET;
                                    break;

                              default:
                                    printk(KERN_INFO "%s: %s Unknown open err code", dev->name, code_err);
                                    tp->LastOpenStatus =
                                          OPEN_FUNCTION_FAILURE;
                                    break;
                        }
                  }

                  tp->AdapterOpenFlag     = 0;
                  tp->AdapterVirtOpenFlag = 0;

                  return;
            }
      }
      else
      {
            if(ssb_cmd != READ_ERROR_LOG)
                  return;

            /* Add values from the error log table to the MAC
             * statistics counters and update the errorlogtable
             * memory.
             */
            tp->MacStat.line_errors += tp->errorlogtable.Line_Error;
            tp->MacStat.burst_errors += tp->errorlogtable.Burst_Error;
            tp->MacStat.A_C_errors += tp->errorlogtable.ARI_FCI_Error;
            tp->MacStat.lost_frames += tp->errorlogtable.Lost_Frame_Error;
            tp->MacStat.recv_congest_count += tp->errorlogtable.Rx_Congest_Error;
            tp->MacStat.rx_errors += tp->errorlogtable.Rx_Congest_Error;
            tp->MacStat.frame_copied_errors += tp->errorlogtable.Frame_Copied_Error;
            tp->MacStat.token_errors += tp->errorlogtable.Token_Error;
            tp->MacStat.dummy1 += tp->errorlogtable.DMA_Bus_Error;
            tp->MacStat.dummy1 += tp->errorlogtable.DMA_Parity_Error;
            tp->MacStat.abort_delimiters += tp->errorlogtable.AbortDelimeters;
            tp->MacStat.frequency_errors += tp->errorlogtable.Frequency_Error;
            tp->MacStat.internal_errors += tp->errorlogtable.Internal_Error;
      }

      return;
}

/*
 * The inverse routine to tms380tr_open().
 */
int tms380tr_close(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      netif_stop_queue(dev);
      
      del_timer(&tp->timer);

      /* Flush the Tx and disable Rx here. */

      tp->HaltInProgress      = 1;
      tms380tr_exec_cmd(dev, OC_CLOSE);
      tp->timer.expires = jiffies + 1*HZ;
      tp->timer.function      = tms380tr_timer_end_wait;
      tp->timer.data          = (unsigned long)dev;
      add_timer(&tp->timer);

      tms380tr_enable_interrupts(dev);

      tp->Sleeping = 1;
      interruptible_sleep_on(&tp->wait_for_tok_int);
      tp->TransmitCommandActive = 0;
    
      del_timer(&tp->timer);
      tms380tr_disable_interrupts(dev);
   
#ifdef CONFIG_ISA
      if(dev->dma > 0) 
      {
            unsigned long flags=claim_dma_lock();
            disable_dma(dev->dma);
            release_dma_lock(flags);
      }
#endif
      
      SIFWRITEW(0xFF00, SIFCMD);
#if 0
      if(dev->dma > 0) /* what the? */
            SIFWRITEB(0xff, POSREG);
#endif
      tms380tr_cancel_tx_queue(tp);

      return (0);
}

/*
 * Get the current statistics. This may be called with the card open
 * or closed.
 */
static struct net_device_stats *tms380tr_get_stats(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);

      return ((struct net_device_stats *)&tp->MacStat);
}

/*
 * Set or clear the multicast filter for this adapter.
 */
static void tms380tr_set_multicast_list(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      unsigned int OpenOptions;
      
      OpenOptions = tp->ocpl.OPENOptions &
            ~(PASS_ADAPTER_MAC_FRAMES
              | PASS_ATTENTION_FRAMES
              | PASS_BEACON_MAC_FRAMES
              | COPY_ALL_MAC_FRAMES
              | COPY_ALL_NON_MAC_FRAMES);
      
      tp->ocpl.FunctAddr = 0;
      
      if(dev->flags & IFF_PROMISC)
            /* Enable promiscuous mode */
            OpenOptions |= COPY_ALL_NON_MAC_FRAMES |
                  COPY_ALL_MAC_FRAMES;
      else
      {
            if(dev->flags & IFF_ALLMULTI)
            {
                  /* Disable promiscuous mode, use normal mode. */
                  tp->ocpl.FunctAddr = 0xFFFFFFFF;
            }
            else
            {
                  int i;
                  struct dev_mc_list *mclist = dev->mc_list;
                  for (i=0; i< dev->mc_count; i++)
                  {
                        ((char *)(&tp->ocpl.FunctAddr))[0] |=
                              mclist->dmi_addr[2];
                        ((char *)(&tp->ocpl.FunctAddr))[1] |=
                              mclist->dmi_addr[3];
                        ((char *)(&tp->ocpl.FunctAddr))[2] |=
                              mclist->dmi_addr[4];
                        ((char *)(&tp->ocpl.FunctAddr))[3] |=
                              mclist->dmi_addr[5];
                        mclist = mclist->next;
                  }
            }
            tms380tr_exec_cmd(dev, OC_SET_FUNCT_ADDR);
      }
      
      tp->ocpl.OPENOptions = OpenOptions;
      tms380tr_exec_cmd(dev, OC_MODIFY_OPEN_PARMS);
      return;
}

/*
 * Wait for some time (microseconds)
 */
void tms380tr_wait(unsigned long time)
{
#if 0
      long tmp;
      
      tmp = jiffies + time/(1000000/HZ);
      do {
            tmp = schedule_timeout_interruptible(tmp);
      } while(time_after(tmp, jiffies));
#else
      udelay(time);
#endif
      return;
}

/*
 * Write a command value to the SIFCMD register
 */
static void tms380tr_exec_sifcmd(struct net_device *dev, unsigned int WriteValue)
{
      unsigned short cmd;
      unsigned short SifStsValue;
      unsigned long loop_counter;

      WriteValue = ((WriteValue ^ CMD_SYSTEM_IRQ) | CMD_INTERRUPT_ADAPTER);
      cmd = (unsigned short)WriteValue;
      loop_counter = 0,5 * 800000;
      do {
            SifStsValue = SIFREADW(SIFSTS);
      } while((SifStsValue & CMD_INTERRUPT_ADAPTER) && loop_counter--);
      SIFWRITEW(cmd, SIFCMD);

      return;
}

/*
 * Processes adapter hardware reset, halts adapter and downloads firmware,
 * clears the halt bit.
 */
static int tms380tr_reset_adapter(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      unsigned short *fw_ptr;
      unsigned short count, c, count2;
      const struct firmware *fw_entry = NULL;

      if (request_firmware(&fw_entry, "tms380tr.bin", tp->pdev) != 0) {
            printk(KERN_ALERT "%s: firmware %s is missing, cannot start.\n",
                  dev->name, "tms380tr.bin");
            return (-1);
      }

      fw_ptr = (unsigned short *)fw_entry->data;
      count2 = fw_entry->size / 2;

      /* Hardware adapter reset */
      SIFWRITEW(ACL_ARESET, SIFACL);
      tms380tr_wait(40);
      
      c = SIFREADW(SIFACL);
      tms380tr_wait(20);

      if(dev->dma == 0) /* For PCI adapters */
      {
            c &= ~(ACL_NSELOUT0 | ACL_NSELOUT1);      /* Clear bits */
            if(tp->setnselout)
              c |= (*tp->setnselout)(dev);
      }

      /* In case a command is pending - forget it */
      tp->ScbInUse = 0;

      c &= ~ACL_ARESET;       /* Clear adapter reset bit */
      c |=  ACL_CPHALT;       /* Halt adapter CPU, allow download */
      c |= ACL_BOOT;
      c |= ACL_SINTEN;
      c &= ~ACL_PSDMAEN;            /* Clear pseudo dma bit */
      SIFWRITEW(c, SIFACL);
      tms380tr_wait(40);

      count = 0;
      /* Download firmware via DIO interface: */
      do {
            if (count2 < 3) continue;

            /* Download first address part */
            SIFWRITEW(*fw_ptr, SIFADX);
            fw_ptr++;
            count2--;
            /* Download second address part */
            SIFWRITEW(*fw_ptr, SIFADD);
            fw_ptr++;
            count2--;

            if((count = *fw_ptr) != 0)    /* Load loop counter */
            {
                  fw_ptr++;   /* Download block data */
                  count2--;
                  if (count > count2) continue;

                  for(; count > 0; count--)
                  {
                        SIFWRITEW(*fw_ptr, SIFINC);
                        fw_ptr++;
                        count2--;
                  }
            }
            else  /* Stop, if last block downloaded */
            {
                  c = SIFREADW(SIFACL);
                  c &= (~ACL_CPHALT | ACL_SINTEN);

                  /* Clear CPHALT and start BUD */
                  SIFWRITEW(c, SIFACL);
                  if (fw_entry)
                        release_firmware(fw_entry);
                  return (1);
            }
      } while(count == 0);

      if (fw_entry)
            release_firmware(fw_entry);
      printk(KERN_INFO "%s: Adapter Download Failed\n", dev->name);
      return (-1);
}

/*
 * Starts bring up diagnostics of token ring adapter and evaluates
 * diagnostic results.
 */
static int tms380tr_bringup_diags(struct net_device *dev)
{
      int loop_cnt, retry_cnt;
      unsigned short Status;

      tms380tr_wait(HALF_SECOND);
      tms380tr_exec_sifcmd(dev, EXEC_SOFT_RESET);
      tms380tr_wait(HALF_SECOND);

      retry_cnt = BUD_MAX_RETRIES;  /* maximal number of retrys */

      do {
            retry_cnt--;
            if(tms380tr_debug > 3)
                  printk(KERN_DEBUG "BUD-Status: ");
            loop_cnt = BUD_MAX_LOOPCNT;   /* maximum: three seconds*/
            do {              /* Inspect BUD results */
                  loop_cnt--;
                  tms380tr_wait(HALF_SECOND);
                  Status = SIFREADW(SIFSTS);
                  Status &= STS_MASK;

                  if(tms380tr_debug > 3)
                        printk(KERN_DEBUG " %04X \n", Status);
                  /* BUD successfully completed */
                  if(Status == STS_INITIALIZE)
                        return (1);
            /* Unrecoverable hardware error, BUD not completed? */
            } while((loop_cnt > 0) && ((Status & (STS_ERROR | STS_TEST))
                  != (STS_ERROR | STS_TEST)));

            /* Error preventing completion of BUD */
            if(retry_cnt > 0)
            {
                  printk(KERN_INFO "%s: Adapter Software Reset.\n", 
                        dev->name);
                  tms380tr_exec_sifcmd(dev, EXEC_SOFT_RESET);
                  tms380tr_wait(HALF_SECOND);
            }
      } while(retry_cnt > 0);

      Status = SIFREADW(SIFSTS);
      
      printk(KERN_INFO "%s: Hardware error\n", dev->name);
      /* Hardware error occurred! */
      Status &= 0x001f;
      if (Status & 0x0010)
            printk(KERN_INFO "%s: BUD Error: Timeout\n", dev->name);
      else if ((Status & 0x000f) > 6)
            printk(KERN_INFO "%s: BUD Error: Illegal Failure\n", dev->name);
      else
            printk(KERN_INFO "%s: Bring Up Diagnostics Error (%04X) occurred\n", dev->name, Status & 0x000f);

      return (-1);
}

/*
 * Copy initialisation data to adapter memory, beginning at address
 * 1:0A00; Starting DMA test and evaluating result bits.
 */
static int tms380tr_init_adapter(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);

      const unsigned char SCB_Test[6] = {0x00, 0x00, 0xC1, 0xE2, 0xD4, 0x8B};
      const unsigned char SSB_Test[8] = {0xFF, 0xFF, 0xD1, 0xD7,
                                    0xC5, 0xD9, 0xC3, 0xD4};
      void *ptr = (void *)&tp->ipb;
      unsigned short *ipb_ptr = (unsigned short *)ptr;
      unsigned char *cb_ptr = (unsigned char *) &tp->scb;
      unsigned char *sb_ptr = (unsigned char *) &tp->ssb;
      unsigned short Status;
      int i, loop_cnt, retry_cnt;

      /* Normalize: byte order low/high, word order high/low! (only IPB!) */
      tp->ipb.SCB_Addr = SWAPW(((char *)&tp->scb - (char *)tp) + tp->dmabuffer);
      tp->ipb.SSB_Addr = SWAPW(((char *)&tp->ssb - (char *)tp) + tp->dmabuffer);

      if(tms380tr_debug > 3)
      {
            printk(KERN_DEBUG "%s: buffer (real): %lx\n", dev->name, (long) &tp->scb);
            printk(KERN_DEBUG "%s: buffer (virt): %lx\n", dev->name, (long) ((char *)&tp->scb - (char *)tp) + (long) tp->dmabuffer);
            printk(KERN_DEBUG "%s: buffer (DMA) : %lx\n", dev->name, (long) tp->dmabuffer);
            printk(KERN_DEBUG "%s: buffer (tp)  : %lx\n", dev->name, (long) tp);
      }
      /* Maximum: three initialization retries */
      retry_cnt = INIT_MAX_RETRIES;

      do {
            retry_cnt--;

            /* Transfer initialization block */
            SIFWRITEW(0x0001, SIFADX);

            /* To address 0001:0A00 of adapter RAM */
            SIFWRITEW(0x0A00, SIFADD);

            /* Write 11 words to adapter RAM */
            for(i = 0; i < 11; i++)
                  SIFWRITEW(ipb_ptr[i], SIFINC);

            /* Execute SCB adapter command */
            tms380tr_exec_sifcmd(dev, CMD_EXECUTE);

            loop_cnt = INIT_MAX_LOOPCNT;  /* Maximum: 11 seconds */

            /* While remaining retries, no error and not completed */
            do {
                  Status = 0;
                  loop_cnt--;
                  tms380tr_wait(HALF_SECOND);

                  /* Mask interesting status bits */
                  Status = SIFREADW(SIFSTS);
                  Status &= STS_MASK;
            } while(((Status &(STS_INITIALIZE | STS_ERROR | STS_TEST)) != 0)
                  && ((Status & STS_ERROR) == 0) && (loop_cnt != 0));

            if((Status & (STS_INITIALIZE | STS_ERROR | STS_TEST)) == 0)
            {
                  /* Initialization completed without error */
                  i = 0;
                  do {  /* Test if contents of SCB is valid */
                        if(SCB_Test[i] != *(cb_ptr + i))
                        {
                              printk(KERN_INFO "%s: DMA failed\n", dev->name);
                              /* DMA data error: wrong data in SCB */
                              return (-1);
                        }
                        i++;
                  } while(i < 6);

                  i = 0;
                  do {  /* Test if contents of SSB is valid */
                        if(SSB_Test[i] != *(sb_ptr + i))
                              /* DMA data error: wrong data in SSB */
                              return (-1);
                        i++;
                  } while (i < 8);

                  return (1); /* Adapter successfully initialized */
            }
            else
            {
                  if((Status & STS_ERROR) != 0)
                  {
                        /* Initialization error occurred */
                        Status = SIFREADW(SIFSTS);
                        Status &= STS_ERROR_MASK;
                        /* ShowInitialisationErrorCode(Status); */
                        printk(KERN_INFO "%s: Status error: %d\n", dev->name, Status);
                        return (-1); /* Unrecoverable error */
                  }
                  else
                  {
                        if(retry_cnt > 0)
                        {
                              /* Reset adapter and try init again */
                              tms380tr_exec_sifcmd(dev, EXEC_SOFT_RESET);
                              tms380tr_wait(HALF_SECOND);
                        }
                  }
            }
      } while(retry_cnt > 0);

      printk(KERN_INFO "%s: Retry exceeded\n", dev->name);
      return (-1);
}

/*
 * Check for outstanding commands in command queue and tries to execute
 * command immediately. Corresponding command flag in command queue is cleared.
 */
static void tms380tr_chk_outstanding_cmds(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      unsigned long Addr = 0;

      if(tp->CMDqueue == 0)
            return;           /* No command execution */

      /* If SCB in use: no command */
      if(tp->ScbInUse == 1)
            return;

      /* Check if adapter is opened, avoiding COMMAND_REJECT
       * interrupt by the adapter!
       */
      if(tp->AdapterOpenFlag == 0)
      {
            if(tp->CMDqueue & OC_OPEN)
            {
                  /* Execute OPEN command */
                  tp->CMDqueue ^= OC_OPEN;

                  Addr = htonl(((char *)&tp->ocpl - (char *)tp) + tp->dmabuffer);
                  tp->scb.Parm[0] = LOWORD(Addr);
                  tp->scb.Parm[1] = HIWORD(Addr);
                  tp->scb.CMD = OPEN;
            }
            else
                  /* No OPEN command queued, but adapter closed. Note:
                   * We'll try to re-open the adapter in DriverPoll()
                   */
                  return;           /* No adapter command issued */
      }
      else
      {
            /* Adapter is open; evaluate command queue: try to execute
             * outstanding commands (depending on priority!) CLOSE
             * command queued
             */
            if(tp->CMDqueue & OC_CLOSE)
            {
                  tp->CMDqueue ^= OC_CLOSE;
                  tp->AdapterOpenFlag = 0;
                  tp->scb.Parm[0] = 0; /* Parm[0], Parm[1] are ignored */
                  tp->scb.Parm[1] = 0; /* but should be set to zero! */
                  tp->scb.CMD = CLOSE;
                  if(!tp->HaltInProgress)
                        tp->CMDqueue |= OC_OPEN; /* re-open adapter */
                  else
                        tp->CMDqueue = 0; /* no more commands */
            }
            else
            {
                  if(tp->CMDqueue & OC_RECEIVE)
                  {
                        tp->CMDqueue ^= OC_RECEIVE;
                        Addr = htonl(((char *)tp->RplHead - (char *)tp) + tp->dmabuffer);
                        tp->scb.Parm[0] = LOWORD(Addr);
                        tp->scb.Parm[1] = HIWORD(Addr);
                        tp->scb.CMD = RECEIVE;
                  }
                  else
                  {
                        if(tp->CMDqueue & OC_TRANSMIT_HALT)
                        {
                              /* NOTE: TRANSMIT.HALT must be checked 
                               * before TRANSMIT.
                               */
                              tp->CMDqueue ^= OC_TRANSMIT_HALT;
                              tp->scb.CMD = TRANSMIT_HALT;

                              /* Parm[0] and Parm[1] are ignored
                               * but should be set to zero!
                               */
                              tp->scb.Parm[0] = 0;
                              tp->scb.Parm[1] = 0;
                        }
                        else
                        {
                              if(tp->CMDqueue & OC_TRANSMIT)
                              {
                                    /* NOTE: TRANSMIT must be 
                                     * checked after TRANSMIT.HALT
                                     */
                                    if(tp->TransmitCommandActive)
                                    {
                                          if(!tp->TransmitHaltScheduled)
                                          {
                                                tp->TransmitHaltScheduled = 1;
                                                tms380tr_exec_cmd(dev, OC_TRANSMIT_HALT) ;
                                          }
                                          tp->TransmitCommandActive = 0;
                                          return;
                                    }

                                    tp->CMDqueue ^= OC_TRANSMIT;
                                    tms380tr_cancel_tx_queue(tp);
                                    Addr = htonl(((char *)tp->TplBusy - (char *)tp) + tp->dmabuffer);
                                    tp->scb.Parm[0] = LOWORD(Addr);
                                    tp->scb.Parm[1] = HIWORD(Addr);
                                    tp->scb.CMD = TRANSMIT;
                                    tp->TransmitCommandActive = 1;
                              }
                              else
                              {
                                    if(tp->CMDqueue & OC_MODIFY_OPEN_PARMS)
                                    {
                                          tp->CMDqueue ^= OC_MODIFY_OPEN_PARMS;
                                          tp->scb.Parm[0] = tp->ocpl.OPENOptions; /* new OPEN options*/
                                          tp->scb.Parm[0] |= ENABLE_FULL_DUPLEX_SELECTION;
                                          tp->scb.Parm[1] = 0; /* is ignored but should be zero */
                                          tp->scb.CMD = MODIFY_OPEN_PARMS;
                                    }
                                    else
                                    {
                                          if(tp->CMDqueue & OC_SET_FUNCT_ADDR)
                                          {
                                                tp->CMDqueue ^= OC_SET_FUNCT_ADDR;
                                                tp->scb.Parm[0] = LOWORD(tp->ocpl.FunctAddr);
                                                tp->scb.Parm[1] = HIWORD(tp->ocpl.FunctAddr);
                                                tp->scb.CMD = SET_FUNCT_ADDR;
                                          }
                                          else
                                          {
                                                if(tp->CMDqueue & OC_SET_GROUP_ADDR)
                                                {
                                                      tp->CMDqueue ^= OC_SET_GROUP_ADDR;
                                                      tp->scb.Parm[0] = LOWORD(tp->ocpl.GroupAddr);
                                                      tp->scb.Parm[1] = HIWORD(tp->ocpl.GroupAddr);
                                                      tp->scb.CMD = SET_GROUP_ADDR;
                                                }
                                                else
                                                {
                                                      if(tp->CMDqueue & OC_READ_ERROR_LOG)
                                                      {
                                                            tp->CMDqueue ^= OC_READ_ERROR_LOG;
                                                            Addr = htonl(((char *)&tp->errorlogtable - (char *)tp) + tp->dmabuffer);
                                                            tp->scb.Parm[0] = LOWORD(Addr);
                                                            tp->scb.Parm[1] = HIWORD(Addr);
                                                            tp->scb.CMD = READ_ERROR_LOG;
                                                      }
                                                      else
                                                      {
                                                            printk(KERN_WARNING "CheckForOutstandingCommand: unknown Command\n");
                                                            tp->CMDqueue = 0;
                                                            return;
                                                      }
                                                }
                                          }
                                    }
                              }
                        }
                  }
            }
      }

      tp->ScbInUse = 1; /* Set semaphore: SCB in use. */

      /* Execute SCB and generate IRQ when done. */
      tms380tr_exec_sifcmd(dev, CMD_EXECUTE | CMD_SCB_REQUEST);

      return;
}

/*
 * IRQ conditions: signal loss on the ring, transmit or receive of beacon
 * frames (disabled if bit 1 of OPEN option is set); report error MAC
 * frame transmit (disabled if bit 2 of OPEN option is set); open or short
 * circuit fault on the lobe is detected; remove MAC frame received;
 * error counter overflow (255); opened adapter is the only station in ring.
 * After some of the IRQs the adapter is closed!
 */
static void tms380tr_ring_status_irq(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);

      tp->CurrentRingStatus = be16_to_cpu((unsigned short)tp->ssb.Parm[0]);

      /* First: fill up statistics */
      if(tp->ssb.Parm[0] & SIGNAL_LOSS)
      {
            printk(KERN_INFO "%s: Signal Loss\n", dev->name);
            tp->MacStat.line_errors++;
      }

      /* Adapter is closed, but initialized */
      if(tp->ssb.Parm[0] & LOBE_WIRE_FAULT)
      {
            printk(KERN_INFO "%s: Lobe Wire Fault, Reopen Adapter\n", 
                  dev->name);
            tp->MacStat.line_errors++;
      }

      if(tp->ssb.Parm[0] & RING_RECOVERY)
            printk(KERN_INFO "%s: Ring Recovery\n", dev->name);

      /* Counter overflow: read error log */
      if(tp->ssb.Parm[0] & COUNTER_OVERFLOW)
      {
            printk(KERN_INFO "%s: Counter Overflow\n", dev->name);
            tms380tr_exec_cmd(dev, OC_READ_ERROR_LOG);
      }

      /* Adapter is closed, but initialized */
      if(tp->ssb.Parm[0] & REMOVE_RECEIVED)
            printk(KERN_INFO "%s: Remove Received, Reopen Adapter\n", 
                  dev->name);

      /* Adapter is closed, but initialized */
      if(tp->ssb.Parm[0] & AUTO_REMOVAL_ERROR)
            printk(KERN_INFO "%s: Auto Removal Error, Reopen Adapter\n", 
                  dev->name);

      if(tp->ssb.Parm[0] & HARD_ERROR)
            printk(KERN_INFO "%s: Hard Error\n", dev->name);

      if(tp->ssb.Parm[0] & SOFT_ERROR)
            printk(KERN_INFO "%s: Soft Error\n", dev->name);

      if(tp->ssb.Parm[0] & TRANSMIT_BEACON)
            printk(KERN_INFO "%s: Transmit Beacon\n", dev->name);

      if(tp->ssb.Parm[0] & SINGLE_STATION)
            printk(KERN_INFO "%s: Single Station\n", dev->name);

      /* Check if adapter has been closed */
      if(tp->ssb.Parm[0] & ADAPTER_CLOSED)
      {
            printk(KERN_INFO "%s: Adapter closed (Reopening)," 
                  "CurrentRingStat %x\n",
                  dev->name, tp->CurrentRingStatus);
            tp->AdapterOpenFlag = 0;
            tms380tr_open_adapter(dev);
      }

      return;
}

/*
 * Issued if adapter has encountered an unrecoverable hardware
 * or software error.
 */
static void tms380tr_chk_irq(struct net_device *dev)
{
      int i;
      unsigned short AdapterCheckBlock[4];
      struct net_local *tp = netdev_priv(dev);

      tp->AdapterOpenFlag = 0;      /* Adapter closed now */

      /* Page number of adapter memory */
      SIFWRITEW(0x0001, SIFADX);
      /* Address offset */
      SIFWRITEW(CHECKADDR, SIFADR);

      /* Reading 8 byte adapter check block. */
      for(i = 0; i < 4; i++)
            AdapterCheckBlock[i] = SIFREADW(SIFINC);

      if(tms380tr_debug > 3)
      {
            printk(KERN_DEBUG "%s: AdapterCheckBlock: ", dev->name);
            for (i = 0; i < 4; i++)
                  printk("%04X", AdapterCheckBlock[i]);
            printk("\n");
      }

      switch(AdapterCheckBlock[0])
      {
            case DIO_PARITY:
                  printk(KERN_INFO "%s: DIO parity error\n", dev->name);
                  break;

            case DMA_READ_ABORT:
                  printk(KERN_INFO "%s DMA read operation aborted:\n",
                        dev->name);
                  switch (AdapterCheckBlock[1])
                  {
                        case 0:
                              printk(KERN_INFO "Timeout\n");
                              printk(KERN_INFO "Address: %04X %04X\n",
                                    AdapterCheckBlock[2],
                                    AdapterCheckBlock[3]);
                              break;

                        case 1:
                              printk(KERN_INFO "Parity error\n");
                              printk(KERN_INFO "Address: %04X %04X\n",
                                    AdapterCheckBlock[2], 
                                    AdapterCheckBlock[3]);
                              break;

                        case 2: 
                              printk(KERN_INFO "Bus error\n");
                              printk(KERN_INFO "Address: %04X %04X\n",
                                    AdapterCheckBlock[2], 
                                    AdapterCheckBlock[3]);
                              break;

                        default:
                              printk(KERN_INFO "Unknown error.\n");
                              break;
                  }
                  break;

            case DMA_WRITE_ABORT:
                  printk(KERN_INFO "%s: DMA write operation aborted: \n",
                        dev->name);
                  switch (AdapterCheckBlock[1])
                  {
                        case 0: 
                              printk(KERN_INFO "Timeout\n");
                              printk(KERN_INFO "Address: %04X %04X\n",
                                    AdapterCheckBlock[2], 
                                    AdapterCheckBlock[3]);
                              break;

                        case 1: 
                              printk(KERN_INFO "Parity error\n");
                              printk(KERN_INFO "Address: %04X %04X\n",
                                    AdapterCheckBlock[2], 
                                    AdapterCheckBlock[3]);
                              break;

                        case 2: 
                              printk(KERN_INFO "Bus error\n");
                              printk(KERN_INFO "Address: %04X %04X\n",
                                    AdapterCheckBlock[2], 
                                    AdapterCheckBlock[3]);
                              break;

                        default:
                              printk(KERN_INFO "Unknown error.\n");
                              break;
                  }
                  break;

            case ILLEGAL_OP_CODE:
                  printk(KERN_INFO "%s: Illegal operation code in firmware\n",
                        dev->name);
                  /* Parm[0-3]: adapter internal register R13-R15 */
                  break;

            case PARITY_ERRORS:
                  printk(KERN_INFO "%s: Adapter internal bus parity error\n",
                        dev->name);
                  /* Parm[0-3]: adapter internal register R13-R15 */
                  break;

            case RAM_DATA_ERROR:
                  printk(KERN_INFO "%s: RAM data error\n", dev->name);
                  /* Parm[0-1]: MSW/LSW address of RAM location. */
                  break;

            case RAM_PARITY_ERROR:
                  printk(KERN_INFO "%s: RAM parity error\n", dev->name);
                  /* Parm[0-1]: MSW/LSW address of RAM location. */
                  break;

            case RING_UNDERRUN:
                  printk(KERN_INFO "%s: Internal DMA underrun detected\n",
                        dev->name);
                  break;

            case INVALID_IRQ:
                  printk(KERN_INFO "%s: Unrecognized interrupt detected\n",
                        dev->name);
                  /* Parm[0-3]: adapter internal register R13-R15 */
                  break;

            case INVALID_ERROR_IRQ:
                  printk(KERN_INFO "%s: Unrecognized error interrupt detected\n",
                        dev->name);
                  /* Parm[0-3]: adapter internal register R13-R15 */
                  break;

            case INVALID_XOP:
                  printk(KERN_INFO "%s: Unrecognized XOP request detected\n",
                        dev->name);
                  /* Parm[0-3]: adapter internal register R13-R15 */
                  break;

            default:
                  printk(KERN_INFO "%s: Unknown status", dev->name);
                  break;
      }

      if(tms380tr_chipset_init(dev) == 1)
      {
            /* Restart of firmware successful */
            tp->AdapterOpenFlag = 1;
      }

      return;
}

/*
 * Internal adapter pointer to RAM data are copied from adapter into
 * host system.
 */
static int tms380tr_read_ptr(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      unsigned short adapterram;

      tms380tr_read_ram(dev, (unsigned char *)&tp->intptrs.BurnedInAddrPtr,
                  ADAPTER_INT_PTRS, 16);
      tms380tr_read_ram(dev, (unsigned char *)&adapterram,
                  cpu_to_be16((unsigned short)tp->intptrs.AdapterRAMPtr), 2);
      return be16_to_cpu(adapterram); 
}

/*
 * Reads a number of bytes from adapter to system memory.
 */
static void tms380tr_read_ram(struct net_device *dev, unsigned char *Data,
                        unsigned short Address, int Length)
{
      int i;
      unsigned short old_sifadx, old_sifadr, InWord;

      /* Save the current values */
      old_sifadx = SIFREADW(SIFADX);
      old_sifadr = SIFREADW(SIFADR);

      /* Page number of adapter memory */
      SIFWRITEW(0x0001, SIFADX);
      /* Address offset in adapter RAM */
        SIFWRITEW(Address, SIFADR);

      /* Copy len byte from adapter memory to system data area. */
      i = 0;
      for(;;)
      {
            InWord = SIFREADW(SIFINC);

            *(Data + i) = HIBYTE(InWord); /* Write first byte */
            if(++i == Length)       /* All is done break */
                  break;

            *(Data + i) = LOBYTE(InWord); /* Write second byte */
            if (++i == Length)            /* All is done break */
                  break;
      }

      /* Restore original values */
      SIFWRITEW(old_sifadx, SIFADX);
      SIFWRITEW(old_sifadr, SIFADR);

      return;
}

/*
 * Cancel all queued packets in the transmission queue.
 */
static void tms380tr_cancel_tx_queue(struct net_local* tp)
{
      TPL *tpl;

      /*
       * NOTE: There must not be an active TRANSMIT command pending, when
       * this function is called.
       */
      if(tp->TransmitCommandActive)
            return;

      for(;;)
      {
            tpl = tp->TplBusy;
            if(!tpl->BusyFlag)
                  break;
            /* "Remove" TPL from busy list. */
            tp->TplBusy = tpl->NextTPLPtr;
            tms380tr_write_tpl_status(tpl, 0);  /* Clear VALID bit */
            tpl->BusyFlag = 0;            /* "free" TPL */

            printk(KERN_INFO "Cancel tx (%08lXh).\n", (unsigned long)tpl);
            if (tpl->DMABuff)
                  dma_unmap_single(tp->pdev, tpl->DMABuff, tpl->Skb->len, DMA_TO_DEVICE);
            dev_kfree_skb_any(tpl->Skb);
      }

      return;
}

/*
 * This function is called whenever a transmit interrupt is generated by the
 * adapter. For a command complete interrupt, it is checked if we have to
 * issue a new transmit command or not.
 */
static void tms380tr_tx_status_irq(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      unsigned char HighByte, HighAc, LowAc;
      TPL *tpl;

      /* NOTE: At this point the SSB from TRANSMIT STATUS is no longer
       * available, because the CLEAR SSB command has already been issued.
       *
       * Process all complete transmissions.
       */

      for(;;)
      {
            tpl = tp->TplBusy;
            if(!tpl->BusyFlag || (tpl->Status
                  & (TX_VALID | TX_FRAME_COMPLETE))
                  != TX_FRAME_COMPLETE)
            {
                  break;
            }

            /* "Remove" TPL from busy list. */
            tp->TplBusy = tpl->NextTPLPtr ;

            /* Check the transmit status field only for directed frames*/
            if(DIRECTED_FRAME(tpl) && (tpl->Status & TX_ERROR) == 0)
            {
                  HighByte = GET_TRANSMIT_STATUS_HIGH_BYTE(tpl->Status);
                  HighAc   = GET_FRAME_STATUS_HIGH_AC(HighByte);
                  LowAc    = GET_FRAME_STATUS_LOW_AC(HighByte);

                  if((HighAc != LowAc) || (HighAc == AC_NOT_RECOGNIZED))
                  {
                        printk(KERN_DEBUG "%s: (DA=%08lX not recognized)\n",
                              dev->name,
                              *(unsigned long *)&tpl->MData[2+2]);
                  }
                  else
                  {
                        if(tms380tr_debug > 3)
                              printk(KERN_DEBUG "%s: Directed frame tx'd\n", 
                                    dev->name);
                  }
            }
            else
            {
                  if(!DIRECTED_FRAME(tpl))
                  {
                        if(tms380tr_debug > 3)
                              printk(KERN_DEBUG "%s: Broadcast frame tx'd\n",
                                    dev->name);
                  }
            }

            tp->MacStat.tx_packets++;
            if (tpl->DMABuff)
                  dma_unmap_single(tp->pdev, tpl->DMABuff, tpl->Skb->len, DMA_TO_DEVICE);
            dev_kfree_skb_irq(tpl->Skb);
            tpl->BusyFlag = 0;      /* "free" TPL */
      }

      if(!tp->TplFree->NextTPLPtr->BusyFlag)
            netif_wake_queue(dev);
      return;
}

/*
 * Called if a frame receive interrupt is generated by the adapter.
 * Check if the frame is valid and indicate it to system.
 */
static void tms380tr_rcv_status_irq(struct net_device *dev)
{
      struct net_local *tp = netdev_priv(dev);
      unsigned char *ReceiveDataPtr;
      struct sk_buff *skb;
      unsigned int Length, Length2;
      RPL *rpl;
      RPL *SaveHead;
      dma_addr_t dmabuf;

      /* NOTE: At this point the SSB from RECEIVE STATUS is no longer
       * available, because the CLEAR SSB command has already been issued.
       *
       * Process all complete receives.
       */

      for(;;)
      {
            rpl = tp->RplHead;
            if(rpl->Status & RX_VALID)
                  break;            /* RPL still in use by adapter */

            /* Forward RPLHead pointer to next list. */
            SaveHead = tp->RplHead;
            tp->RplHead = rpl->NextRPLPtr;

            /* Get the frame size (Byte swap for Intel).
             * Do this early (see workaround comment below)
             */
            Length = be16_to_cpu(rpl->FrameSize);

            /* Check if the Frame_Start, Frame_End and
             * Frame_Complete bits are set.
             */
            if((rpl->Status & VALID_SINGLE_BUFFER_FRAME)
                  == VALID_SINGLE_BUFFER_FRAME)
            {
                  ReceiveDataPtr = rpl->MData;

                  /* Workaround for delayed write of FrameSize on ISA
                   * (FrameSize is false but valid-bit is reset)
                   * Frame size is set to zero when the RPL is freed.
                   * Length2 is there because there have also been
                   * cases where the FrameSize was partially written
                   */
                  Length2 = be16_to_cpu(rpl->FrameSize);

                  if(Length == 0 || Length != Length2)
                  {
                        tp->RplHead = SaveHead;
                        break;      /* Return to tms380tr_interrupt */
                  }
                  tms380tr_update_rcv_stats(tp,ReceiveDataPtr,Length);
                    
                  if(tms380tr_debug > 3)
                        printk(KERN_DEBUG "%s: Packet Length %04X (%d)\n",
                              dev->name, Length, Length);
                    
                  /* Indicate the received frame to system the
                   * adapter does the Source-Routing padding for 
                   * us. See: OpenOptions in tms380tr_init_opb()
                   */
                  skb = rpl->Skb;
                  if(rpl->SkbStat == SKB_UNAVAILABLE)
                  {
                        /* Try again to allocate skb */
                        skb = dev_alloc_skb(tp->MaxPacketSize);
                        if(skb == NULL)
                        {
                              /* Update Stats ?? */
                        }
                        else
                        {
                              skb_put(skb, tp->MaxPacketSize);
                              rpl->SkbStat      = SKB_DATA_COPY;
                              ReceiveDataPtr    = rpl->MData;
                        }
                  }

                  if(skb && (rpl->SkbStat == SKB_DATA_COPY
                        || rpl->SkbStat == SKB_DMA_DIRECT))
                  {
                        if(rpl->SkbStat == SKB_DATA_COPY)
                              skb_copy_to_linear_data(skb, ReceiveDataPtr,
                                           Length);

                        /* Deliver frame to system */
                        rpl->Skb = NULL;
                        skb_trim(skb,Length);
                        skb->protocol = tr_type_trans(skb,dev);
                        netif_rx(skb);
                        dev->last_rx = jiffies;
                  }
            }
            else  /* Invalid frame */
            {
                  if(rpl->Skb != NULL)
                        dev_kfree_skb_irq(rpl->Skb);

                  /* Skip list. */
                  if(rpl->Status & RX_START_FRAME)
                        /* Frame start bit is set -> overflow. */
                        tp->MacStat.rx_errors++;
            }
            if (rpl->DMABuff)
                  dma_unmap_single(tp->pdev, rpl->DMABuff, tp->MaxPacketSize, DMA_TO_DEVICE);
            rpl->DMABuff = 0;

            /* Allocate new skb for rpl */
            rpl->Skb = dev_alloc_skb(tp->MaxPacketSize);
            /* skb == NULL ? then use local buffer */
            if(rpl->Skb == NULL)
            {
                  rpl->SkbStat = SKB_UNAVAILABLE;
                  rpl->FragList[0].DataAddr = htonl(((char *)tp->LocalRxBuffers[rpl->RPLIndex] - (char *)tp) + tp->dmabuffer);
                  rpl->MData = tp->LocalRxBuffers[rpl->RPLIndex];
            }
            else  /* skb != NULL */
            {
                  rpl->Skb->dev = dev;
                  skb_put(rpl->Skb, tp->MaxPacketSize);

                  /* Data unreachable for DMA ? then use local buffer */
                  dmabuf = dma_map_single(tp->pdev, rpl->Skb->data, tp->MaxPacketSize, DMA_FROM_DEVICE);
                  if(tp->dmalimit && (dmabuf + tp->MaxPacketSize > tp->dmalimit))
                  {
                        rpl->SkbStat = SKB_DATA_COPY;
                        rpl->FragList[0].DataAddr = htonl(((char *)tp->LocalRxBuffers[rpl->RPLIndex] - (char *)tp) + tp->dmabuffer);
                        rpl->MData = tp->LocalRxBuffers[rpl->RPLIndex];
                  }
                  else
                  {
                        /* DMA directly in skb->data */
                        rpl->SkbStat = SKB_DMA_DIRECT;
                        rpl->FragList[0].DataAddr = htonl(dmabuf);
                        rpl->MData = rpl->Skb->data;
                        rpl->DMABuff = dmabuf;
                  }
            }

            rpl->FragList[0].DataCount = cpu_to_be16((unsigned short)tp->MaxPacketSize);
            rpl->FrameSize = 0;

            /* Pass the last RPL back to the adapter */
            tp->RplTail->FrameSize = 0;

            /* Reset the CSTAT field in the list. */
            tms380tr_write_rpl_status(tp->RplTail, RX_VALID | RX_FRAME_IRQ);

            /* Current RPL becomes last one in list. */
            tp->RplTail = tp->RplTail->NextRPLPtr;

            /* Inform adapter about RPL valid. */
            tms380tr_exec_sifcmd(dev, CMD_RX_VALID);
      }

      return;
}

/*
 * This function should be used whenever the status of any RPL must be
 * modified by the driver, because the compiler may otherwise change the
 * order of instructions such that writing the RPL status may be executed
 * at an undesireable time. When this function is used, the status is
 * always written when the function is called.
 */
static void tms380tr_write_rpl_status(RPL *rpl, unsigned int Status)
{
      rpl->Status = Status;

      return;
}

/*
 * The function updates the statistic counters in mac->MacStat.
 * It differtiates between directed and broadcast/multicast ( ==functional)
 * frames.
 */
static void tms380tr_update_rcv_stats(struct net_local *tp, unsigned char DataPtr[],
                              unsigned int Length)
{
      tp->MacStat.rx_packets++;
      tp->MacStat.rx_bytes += Length;
      
      /* Test functional bit */
      if(DataPtr[2] & GROUP_BIT)
            tp->MacStat.multicast++;

      return;
}

static int tms380tr_set_mac_address(struct net_device *dev, void *addr)
{
      struct net_local *tp = netdev_priv(dev);
      struct sockaddr *saddr = addr;
      
      if (tp->AdapterOpenFlag || tp->AdapterVirtOpenFlag) {
            printk(KERN_WARNING "%s: Cannot set MAC/LAA address while card is open\n", dev->name);
            return -EIO;
      }
      memcpy(dev->dev_addr, saddr->sa_data, dev->addr_len);
      return 0;
}

#if TMS380TR_DEBUG > 0
/*
 * Dump Packet (data)
 */
static void tms380tr_dump(unsigned char *Data, int length)
{
      int i, j;

      for (i = 0, j = 0; i < length / 8; i++, j += 8)
      {
            printk(KERN_DEBUG "%02x %02x %02x %02x %02x %02x %02x %02x\n",
                   Data[j+0],Data[j+1],Data[j+2],Data[j+3],
                   Data[j+4],Data[j+5],Data[j+6],Data[j+7]);
      }

      return;
}
#endif

void tmsdev_term(struct net_device *dev)
{
      struct net_local *tp;

      tp = netdev_priv(dev);
      dma_unmap_single(tp->pdev, tp->dmabuffer, sizeof(struct net_local),
            DMA_BIDIRECTIONAL);
}

int tmsdev_init(struct net_device *dev, struct device *pdev)
{
      struct net_local *tms_local;

      memset(dev->priv, 0, sizeof(struct net_local));
      tms_local = netdev_priv(dev);
      init_waitqueue_head(&tms_local->wait_for_tok_int);
      if (pdev->dma_mask)
            tms_local->dmalimit = *pdev->dma_mask;
      else
            return -ENOMEM;
      tms_local->pdev = pdev;
      tms_local->dmabuffer = dma_map_single(pdev, (void *)tms_local,
          sizeof(struct net_local), DMA_BIDIRECTIONAL);
      if (tms_local->dmabuffer + sizeof(struct net_local) > 
                  tms_local->dmalimit)
      {
            printk(KERN_INFO "%s: Memory not accessible for DMA\n",
                  dev->name);
            tmsdev_term(dev);
            return -ENOMEM;
      }
      
      /* These can be overridden by the card driver if needed */
      dev->open         = tms380tr_open;
      dev->stop         = tms380tr_close;
      dev->do_ioctl           = NULL; 
      dev->hard_start_xmit    = tms380tr_send_packet;
      dev->tx_timeout         = tms380tr_timeout;
      dev->watchdog_timeo     = HZ;
      dev->get_stats          = tms380tr_get_stats;
      dev->set_multicast_list = &tms380tr_set_multicast_list;
      dev->set_mac_address    = tms380tr_set_mac_address;

      return 0;
}

EXPORT_SYMBOL(tms380tr_open);
EXPORT_SYMBOL(tms380tr_close);
EXPORT_SYMBOL(tms380tr_interrupt);
EXPORT_SYMBOL(tmsdev_init);
EXPORT_SYMBOL(tmsdev_term);
EXPORT_SYMBOL(tms380tr_wait);

#ifdef MODULE

static struct module *TMS380_module = NULL;

int init_module(void)
{
      printk(KERN_DEBUG "%s", version);
      
      TMS380_module = &__this_module;
      return 0;
}

void cleanup_module(void)
{
      TMS380_module = NULL;
}
#endif

MODULE_LICENSE("GPL");


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