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eni.c

/* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
 
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
 

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/skbuff.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/uio.h>
#include <linux/init.h>
#include <linux/atm_eni.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include <asm/string.h>
#include <asm/byteorder.h>

#include "tonga.h"
#include "midway.h"
#include "suni.h"
#include "eni.h"

#if !defined(__i386__) && !defined(__x86_64__)
#ifndef ioremap_nocache
#define ioremap_nocache(X,Y) ioremap(X,Y)
#endif 
#endif

/*
 * TODO:
 *
 * Show stoppers
 *  none
 *
 * Minor
 *  - OAM support
 *  - fix bugs listed below
 */

/*
 * KNOWN BUGS:
 *
 * - may run into JK-JK bug and deadlock
 * - should allocate UBR channel first
 * - buffer space allocation algorithm is stupid
 *   (RX: should be maxSDU+maxdelay*rate
 *    TX: should be maxSDU+min(maxSDU,maxdelay*rate) )
 * - doesn't support OAM cells
 * - eni_put_free may hang if not putting memory fragments that _complete_
 *   2^n block (never happens in real life, though)
 */


#if 0
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif


#ifndef CONFIG_ATM_ENI_TUNE_BURST
#define CONFIG_ATM_ENI_BURST_TX_8W
#define CONFIG_ATM_ENI_BURST_RX_4W
#endif


#ifndef CONFIG_ATM_ENI_DEBUG


#define NULLCHECK(x)

#define EVENT(s,a,b)


static void event_dump(void)
{
}


#else


/* 
 * NULL pointer checking
 */

#define NULLCHECK(x) \
      if ((unsigned long) (x) < 0x30) \
            printk(KERN_CRIT #x "==0x%lx\n",(unsigned long) (x))

/*
 * Very extensive activity logging. Greatly improves bug detection speed but
 * costs a few Mbps if enabled.
 */

#define EV 64

static const char *ev[EV];
static unsigned long ev_a[EV],ev_b[EV];
static int ec = 0;


static void EVENT(const char *s,unsigned long a,unsigned long b)
{
      ev[ec] = s; 
      ev_a[ec] = a;
      ev_b[ec] = b;
      ec = (ec+1) % EV;
}


static void event_dump(void)
{
      int n,i;

      for (n = 0; n < EV; n++) {
            i = (ec+n) % EV;
            printk(KERN_NOTICE);
            printk(ev[i] ? ev[i] : "(null)",ev_a[i],ev_b[i]);
      }
}


#endif /* CONFIG_ATM_ENI_DEBUG */


/*
 * NExx   must not be equal at end
 * EExx   may be equal at end
 * xxPJOK verify validity of pointer jumps
 * xxPMOK operating on a circular buffer of "c" words
 */

#define NEPJOK(a0,a1,b) \
    ((a0) < (a1) ? (b) <= (a0) || (b) > (a1) : (b) <= (a0) && (b) > (a1))
#define EEPJOK(a0,a1,b) \
    ((a0) < (a1) ? (b) < (a0) || (b) >= (a1) : (b) < (a0) && (b) >= (a1))
#define NEPMOK(a0,d,b,c) NEPJOK(a0,(a0+d) & (c-1),b)
#define EEPMOK(a0,d,b,c) EEPJOK(a0,(a0+d) & (c-1),b)


static int tx_complete = 0,dma_complete = 0,queued = 0,requeued = 0,
  backlogged = 0,rx_enqueued = 0,rx_dequeued = 0,pushed = 0,submitted = 0,
  putting = 0;

static struct atm_dev *eni_boards = NULL;

static u32 *cpu_zeroes = NULL; /* aligned "magic" zeroes */
static dma_addr_t zeroes;

/* Read/write registers on card */
#define eni_in(r) readl(eni_dev->reg+(r)*4)
#define eni_out(v,r)    writel((v),eni_dev->reg+(r)*4)


/*-------------------------------- utilities --------------------------------*/


static void dump_mem(struct eni_dev *eni_dev)
{
      int i;

      for (i = 0; i < eni_dev->free_len; i++)
            printk(KERN_DEBUG "  %d: %p %d\n",i,
                eni_dev->free_list[i].start,
                1 << eni_dev->free_list[i].order);
}


static void dump(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;

      int i;

      eni_dev = ENI_DEV(dev);
      printk(KERN_NOTICE "Free memory\n");
      dump_mem(eni_dev);
      printk(KERN_NOTICE "TX buffers\n");
      for (i = 0; i < NR_CHAN; i++)
            if (eni_dev->tx[i].send)
                  printk(KERN_NOTICE "  TX %d @ %p: %ld\n",i,
                      eni_dev->tx[i].send,eni_dev->tx[i].words*4);
      printk(KERN_NOTICE "RX buffers\n");
      for (i = 0; i < 1024; i++)
            if (eni_dev->rx_map[i] && ENI_VCC(eni_dev->rx_map[i])->rx)
                  printk(KERN_NOTICE "  RX %d @ %p: %ld\n",i,
                      ENI_VCC(eni_dev->rx_map[i])->recv,
                      ENI_VCC(eni_dev->rx_map[i])->words*4);
      printk(KERN_NOTICE "----\n");
}


static void eni_put_free(struct eni_dev *eni_dev, void __iomem *start,
    unsigned long size)
{
      struct eni_free *list;
      int len,order;

      DPRINTK("init 0x%lx+%ld(0x%lx)\n",start,size,size);
      start += eni_dev->base_diff;
      list = eni_dev->free_list;
      len = eni_dev->free_len;
      while (size) {
            if (len >= eni_dev->free_list_size) {
                  printk(KERN_CRIT "eni_put_free overflow (%p,%ld)\n",
                      start,size);
                  break;
            }
            for (order = 0; !(((unsigned long)start | size) & (1 << order)); order++);
            if (MID_MIN_BUF_SIZE > (1 << order)) {
                  printk(KERN_CRIT "eni_put_free: order %d too small\n",
                      order);
                  break;
            }
            list[len].start = (void __iomem *) start;
            list[len].order = order;
            len++;
            start += 1 << order;
            size -= 1 << order;
      }
      eni_dev->free_len = len;
      /*dump_mem(eni_dev);*/
}


static void __iomem *eni_alloc_mem(struct eni_dev *eni_dev, unsigned long *size)
{
      struct eni_free *list;
      void __iomem *start;
      int len,i,order,best_order,index;

      list = eni_dev->free_list;
      len = eni_dev->free_len;
      if (*size < MID_MIN_BUF_SIZE) *size = MID_MIN_BUF_SIZE;
      if (*size > MID_MAX_BUF_SIZE) return NULL;
      for (order = 0; (1 << order) < *size; order++);
      DPRINTK("trying: %ld->%d\n",*size,order);
      best_order = 65; /* we don't have more than 2^64 of anything ... */
      index = 0; /* silence GCC */
      for (i = 0; i < len; i++)
            if (list[i].order == order) {
                  best_order = order;
                  index = i;
                  break;
            }
            else if (best_order > list[i].order && list[i].order > order) {
                        best_order = list[i].order;
                        index = i;
                  }
      if (best_order == 65) return NULL;
      start = list[index].start-eni_dev->base_diff;
      list[index] = list[--len];
      eni_dev->free_len = len;
      *size = 1 << order;
      eni_put_free(eni_dev,start+*size,(1 << best_order)-*size);
      DPRINTK("%ld bytes (order %d) at 0x%lx\n",*size,order,start);
      memset_io(start,0,*size);       /* never leak data */
      /*dump_mem(eni_dev);*/
      return start;
}


static void eni_free_mem(struct eni_dev *eni_dev, void __iomem *start,
    unsigned long size)
{
      struct eni_free *list;
      int len,i,order;

      start += eni_dev->base_diff;
      list = eni_dev->free_list;
      len = eni_dev->free_len;
      for (order = -1; size; order++) size >>= 1;
      DPRINTK("eni_free_mem: %p+0x%lx (order %d)\n",start,size,order);
      for (i = 0; i < len; i++)
            if (((unsigned long) list[i].start) == ((unsigned long)start^(1 << order)) &&
                list[i].order == order) {
                  DPRINTK("match[%d]: 0x%lx/0x%lx(0x%x), %d/%d\n",i,
                      list[i].start,start,1 << order,list[i].order,order);
                  list[i] = list[--len];
                  start = (void __iomem *) ((unsigned long) start & ~(unsigned long) (1 << order));
                  order++;
                  i = -1;
                  continue;
            }
      if (len >= eni_dev->free_list_size) {
            printk(KERN_ALERT "eni_free_mem overflow (%p,%d)\n",start,
                order);
            return;
      }
      list[len].start = start;
      list[len].order = order;
      eni_dev->free_len = len+1;
      /*dump_mem(eni_dev);*/
}


/*----------------------------------- RX ------------------------------------*/


#define ENI_VCC_NOS ((struct atm_vcc *) 1)


static void rx_ident_err(struct atm_vcc *vcc)
{
      struct atm_dev *dev;
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;

      dev = vcc->dev;
      eni_dev = ENI_DEV(dev);
      /* immediately halt adapter */
      eni_out(eni_in(MID_MC_S) &
          ~(MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE),MID_MC_S);
      /* dump useful information */
      eni_vcc = ENI_VCC(vcc);
      printk(KERN_ALERT DEV_LABEL "(itf %d): driver error - RX ident "
          "mismatch\n",dev->number);
      printk(KERN_ALERT "  VCI %d, rxing %d, words %ld\n",vcc->vci,
          eni_vcc->rxing,eni_vcc->words);
      printk(KERN_ALERT "  host descr 0x%lx, rx pos 0x%lx, descr value "
          "0x%x\n",eni_vcc->descr,eni_vcc->rx_pos,
          (unsigned) readl(eni_vcc->recv+eni_vcc->descr*4));
      printk(KERN_ALERT "  last %p, servicing %d\n",eni_vcc->last,
          eni_vcc->servicing);
      EVENT("---dump ends here---\n",0,0);
      printk(KERN_NOTICE "---recent events---\n");
      event_dump();
      ENI_DEV(dev)->fast = NULL; /* really stop it */
      ENI_DEV(dev)->slow = NULL;
      skb_queue_head_init(&ENI_DEV(dev)->rx_queue);
}


static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
    unsigned long skip,unsigned long size,unsigned long eff)
{
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;
      u32 dma_rd,dma_wr;
      u32 dma[RX_DMA_BUF*2];
      dma_addr_t paddr;
      unsigned long here;
      int i,j;

      eni_dev = ENI_DEV(vcc->dev);
      eni_vcc = ENI_VCC(vcc);
      paddr = 0; /* GCC, shut up */
      if (skb) {
            paddr = pci_map_single(eni_dev->pci_dev,skb->data,skb->len,
                PCI_DMA_FROMDEVICE);
            ENI_PRV_PADDR(skb) = paddr;
            if (paddr & 3)
                  printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %d has "
                      "mis-aligned RX data (0x%lx)\n",vcc->dev->number,
                      vcc->vci,(unsigned long) paddr);
            ENI_PRV_SIZE(skb) = size+skip;
                /* PDU plus descriptor */
            ATM_SKB(skb)->vcc = vcc;
      }
      j = 0;
      if ((eff && skip) || 1) { /* @@@ actually, skip is always == 1 ... */
            here = (eni_vcc->descr+skip) & (eni_vcc->words-1);
            dma[j++] = (here << MID_DMA_COUNT_SHIFT) | (vcc->vci
                << MID_DMA_VCI_SHIFT) | MID_DT_JK;
            j++;
      }
      here = (eni_vcc->descr+size+skip) & (eni_vcc->words-1);
      if (!eff) size += skip;
      else {
            unsigned long words;

            if (!size) {
                  DPRINTK("strange things happen ...\n");
                  EVENT("strange things happen ... (skip=%ld,eff=%ld)\n",
                      size,eff);
            }
            words = eff;
            if (paddr & 15) {
                  unsigned long init;

                  init = 4-((paddr & 15) >> 2);
                  if (init > words) init = words;
                  dma[j++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
                      (vcc->vci << MID_DMA_VCI_SHIFT);
                  dma[j++] = paddr;
                  paddr += init << 2;
                  words -= init;
            }
#ifdef CONFIG_ATM_ENI_BURST_RX_16W /* may work with some PCI chipsets ... */
            if (words & ~15) {
                  dma[j++] = MID_DT_16W | ((words >> 4) <<
                      MID_DMA_COUNT_SHIFT) | (vcc->vci <<
                      MID_DMA_VCI_SHIFT);
                  dma[j++] = paddr;
                  paddr += (words & ~15) << 2;
                  words &= 15;
            }
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_8W  /* works only with *some* PCI chipsets ... */
            if (words & ~7) {
                  dma[j++] = MID_DT_8W | ((words >> 3) <<
                      MID_DMA_COUNT_SHIFT) | (vcc->vci <<
                      MID_DMA_VCI_SHIFT);
                  dma[j++] = paddr;
                  paddr += (words & ~7) << 2;
                  words &= 7;
            }
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_4W /* recommended */
            if (words & ~3) {
                  dma[j++] = MID_DT_4W | ((words >> 2) <<
                      MID_DMA_COUNT_SHIFT) | (vcc->vci <<
                      MID_DMA_VCI_SHIFT);
                  dma[j++] = paddr;
                  paddr += (words & ~3) << 2;
                  words &= 3;
            }
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_2W /* probably useless if RX_4W, RX_8W, ... */
            if (words & ~1) {
                  dma[j++] = MID_DT_2W | ((words >> 1) <<
                      MID_DMA_COUNT_SHIFT) | (vcc->vci <<
                      MID_DMA_VCI_SHIFT);
                  dma[j++] = paddr;
                  paddr += (words & ~1) << 2;
                  words &= 1;
            }
#endif
            if (words) {
                  dma[j++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT)
                      | (vcc->vci << MID_DMA_VCI_SHIFT);
                  dma[j++] = paddr;
            }
      }
      if (size != eff) {
            dma[j++] = (here << MID_DMA_COUNT_SHIFT) |
                (vcc->vci << MID_DMA_VCI_SHIFT) | MID_DT_JK;
            j++;
      }
      if (!j || j > 2*RX_DMA_BUF) {
            printk(KERN_CRIT DEV_LABEL "!j or j too big!!!\n");
            goto trouble;
      }
      dma[j-2] |= MID_DMA_END;
      j = j >> 1;
      dma_wr = eni_in(MID_DMA_WR_RX);
      dma_rd = eni_in(MID_DMA_RD_RX);
      /*
       * Can I move the dma_wr pointer by 2j+1 positions without overwriting
       * data that hasn't been read (position of dma_rd) yet ?
       */
      if (!NEPMOK(dma_wr,j+j+1,dma_rd,NR_DMA_RX)) { /* @@@ +1 is ugly */
            printk(KERN_WARNING DEV_LABEL "(itf %d): RX DMA full\n",
                vcc->dev->number);
            goto trouble;
      }
        for (i = 0; i < j; i++) {
            writel(dma[i*2],eni_dev->rx_dma+dma_wr*8);
            writel(dma[i*2+1],eni_dev->rx_dma+dma_wr*8+4);
            dma_wr = (dma_wr+1) & (NR_DMA_RX-1);
        }
      if (skb) {
            ENI_PRV_POS(skb) = eni_vcc->descr+size+1;
            skb_queue_tail(&eni_dev->rx_queue,skb);
            eni_vcc->last = skb;
rx_enqueued++;
      }
      eni_vcc->descr = here;
      eni_out(dma_wr,MID_DMA_WR_RX);
      return 0;

trouble:
      if (paddr)
            pci_unmap_single(eni_dev->pci_dev,paddr,skb->len,
                PCI_DMA_FROMDEVICE);
      if (skb) dev_kfree_skb_irq(skb);
      return -1;
}


static void discard(struct atm_vcc *vcc,unsigned long size)
{
      struct eni_vcc *eni_vcc;

      eni_vcc = ENI_VCC(vcc);
      EVENT("discard (size=%ld)\n",size,0);
      while (do_rx_dma(vcc,NULL,1,size,0)) EVENT("BUSY LOOP",0,0);
          /* could do a full fallback, but that might be more expensive */
      if (eni_vcc->rxing) ENI_PRV_POS(eni_vcc->last) += size+1;
      else eni_vcc->rx_pos = (eni_vcc->rx_pos+size+1) & (eni_vcc->words-1);
}


/*
 * TODO: should check whether direct copies (without DMA setup, dequeuing on
 * interrupt, etc.) aren't much faster for AAL0
 */

static int rx_aal0(struct atm_vcc *vcc)
{
      struct eni_vcc *eni_vcc;
      unsigned long descr;
      unsigned long length;
      struct sk_buff *skb;

      DPRINTK(">rx_aal0\n");
      eni_vcc = ENI_VCC(vcc);
      descr = readl(eni_vcc->recv+eni_vcc->descr*4);
      if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
            rx_ident_err(vcc);
            return 1;
      }
      if (descr & MID_RED_T) {
            DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
                vcc->dev->number);
            length = 0;
            atomic_inc(&vcc->stats->rx_err);
      }
      else {
            length = ATM_CELL_SIZE-1; /* no HEC */
      }
      skb = length ? atm_alloc_charge(vcc,length,GFP_ATOMIC) : NULL;
      if (!skb) {
            discard(vcc,length >> 2);
            return 0;
      }
      skb_put(skb,length);
      skb->tstamp = eni_vcc->timestamp;
      DPRINTK("got len %ld\n",length);
      if (do_rx_dma(vcc,skb,1,length >> 2,length >> 2)) return 1;
      eni_vcc->rxing++;
      return 0;
}


static int rx_aal5(struct atm_vcc *vcc)
{
      struct eni_vcc *eni_vcc;
      unsigned long descr;
      unsigned long size,eff,length;
      struct sk_buff *skb;

      EVENT("rx_aal5\n",0,0);
      DPRINTK(">rx_aal5\n");
      eni_vcc = ENI_VCC(vcc);
      descr = readl(eni_vcc->recv+eni_vcc->descr*4);
      if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
            rx_ident_err(vcc);
            return 1;
      }
      if (descr & (MID_RED_T | MID_RED_CRC_ERR)) {
            if (descr & MID_RED_T) {
                  EVENT("empty cell (descr=0x%lx)\n",descr,0);
                  DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
                      vcc->dev->number);
                  size = 0;
            }
            else {
                  static unsigned long silence = 0;

                  if (time_after(jiffies, silence) || silence == 0) {
                        printk(KERN_WARNING DEV_LABEL "(itf %d): "
                            "discarding PDU(s) with CRC error\n",
                            vcc->dev->number);
                        silence = (jiffies+2*HZ)|1;
                  }
                  size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
                  EVENT("CRC error (descr=0x%lx,size=%ld)\n",descr,
                      size);
            }
            eff = length = 0;
            atomic_inc(&vcc->stats->rx_err);
      }
      else {
            size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
            DPRINTK("size=%ld\n",size);
            length = readl(eni_vcc->recv+(((eni_vcc->descr+size-1) &
                (eni_vcc->words-1)))*4) & 0xffff;
                        /* -trailer(2)+header(1) */
            if (length && length <= (size << 2)-8 && length <=
              ATM_MAX_AAL5_PDU) eff = (length+3) >> 2;
            else {                         /* ^ trailer length (8) */
                  EVENT("bad PDU (descr=0x08%lx,length=%ld)\n",descr,
                      length);
                  printk(KERN_ERR DEV_LABEL "(itf %d): bad AAL5 PDU "
                      "(VCI=%d,length=%ld,size=%ld (descr 0x%lx))\n",
                      vcc->dev->number,vcc->vci,length,size << 2,descr);
                  length = eff = 0;
                  atomic_inc(&vcc->stats->rx_err);
            }
      }
      skb = eff ? atm_alloc_charge(vcc,eff << 2,GFP_ATOMIC) : NULL;
      if (!skb) {
            discard(vcc,size);
            return 0;
      }
      skb_put(skb,length);
      DPRINTK("got len %ld\n",length);
      if (do_rx_dma(vcc,skb,1,size,eff)) return 1;
      eni_vcc->rxing++;
      return 0;
}


static inline int rx_vcc(struct atm_vcc *vcc)
{
      void __iomem *vci_dsc;
      unsigned long tmp;
      struct eni_vcc *eni_vcc;

      eni_vcc = ENI_VCC(vcc);
      vci_dsc = ENI_DEV(vcc->dev)->vci+vcc->vci*16;
      EVENT("rx_vcc(1)\n",0,0);
      while (eni_vcc->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR) >>
          MID_VCI_DESCR_SHIFT)) {
            EVENT("rx_vcc(2: host dsc=0x%lx, nic dsc=0x%lx)\n",
                eni_vcc->descr,tmp);
            DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
                (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
                MID_VCI_DESCR_SHIFT));
            if (ENI_VCC(vcc)->rx(vcc)) return 1;
      }
      /* clear IN_SERVICE flag */
      writel(readl(vci_dsc) & ~MID_VCI_IN_SERVICE,vci_dsc);
      /*
       * If new data has arrived between evaluating the while condition and
       * clearing IN_SERVICE, we wouldn't be notified until additional data
       * follows. So we have to loop again to be sure.
       */
      EVENT("rx_vcc(3)\n",0,0);
      while (ENI_VCC(vcc)->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR)
          >> MID_VCI_DESCR_SHIFT)) {
            EVENT("rx_vcc(4: host dsc=0x%lx, nic dsc=0x%lx)\n",
                eni_vcc->descr,tmp);
            DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
                (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
                MID_VCI_DESCR_SHIFT));
            if (ENI_VCC(vcc)->rx(vcc)) return 1;
      }
      return 0;
}


static void poll_rx(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;
      struct atm_vcc *curr;

      eni_dev = ENI_DEV(dev);
      while ((curr = eni_dev->fast)) {
            EVENT("poll_rx.fast\n",0,0);
            if (rx_vcc(curr)) return;
            eni_dev->fast = ENI_VCC(curr)->next;
            ENI_VCC(curr)->next = ENI_VCC_NOS;
            barrier();
            ENI_VCC(curr)->servicing--;
      }
      while ((curr = eni_dev->slow)) {
            EVENT("poll_rx.slow\n",0,0);
            if (rx_vcc(curr)) return;
            eni_dev->slow = ENI_VCC(curr)->next;
            ENI_VCC(curr)->next = ENI_VCC_NOS;
            barrier();
            ENI_VCC(curr)->servicing--;
      }
}


static void get_service(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;
      struct atm_vcc *vcc;
      unsigned long vci;

      DPRINTK(">get_service\n");
      eni_dev = ENI_DEV(dev);
      while (eni_in(MID_SERV_WRITE) != eni_dev->serv_read) {
            vci = readl(eni_dev->service+eni_dev->serv_read*4);
            eni_dev->serv_read = (eni_dev->serv_read+1) & (NR_SERVICE-1);
            vcc = eni_dev->rx_map[vci & 1023];
            if (!vcc) {
                  printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %ld not "
                      "found\n",dev->number,vci);
                  continue; /* nasty but we try to go on anyway */
                  /* @@@ nope, doesn't work */
            }
            EVENT("getting from service\n",0,0);
            if (ENI_VCC(vcc)->next != ENI_VCC_NOS) {
                  EVENT("double service\n",0,0);
                  DPRINTK("Grr, servicing VCC %ld twice\n",vci);
                  continue;
            }
            ENI_VCC(vcc)->timestamp = ktime_get_real();
            ENI_VCC(vcc)->next = NULL;
            if (vcc->qos.rxtp.traffic_class == ATM_CBR) {
                  if (eni_dev->fast)
                        ENI_VCC(eni_dev->last_fast)->next = vcc;
                  else eni_dev->fast = vcc;
                  eni_dev->last_fast = vcc;
            }
            else {
                  if (eni_dev->slow)
                        ENI_VCC(eni_dev->last_slow)->next = vcc;
                  else eni_dev->slow = vcc;
                  eni_dev->last_slow = vcc;
            }
putting++;
            ENI_VCC(vcc)->servicing++;
      }
}


static void dequeue_rx(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;
      struct atm_vcc *vcc;
      struct sk_buff *skb;
      void __iomem *vci_dsc;
      int first;

      eni_dev = ENI_DEV(dev);
      first = 1;
      while (1) {
            skb = skb_dequeue(&eni_dev->rx_queue);
            if (!skb) {
                  if (first) {
                        DPRINTK(DEV_LABEL "(itf %d): RX but not "
                            "rxing\n",dev->number);
                        EVENT("nothing to dequeue\n",0,0);
                  }
                  break;
            }
            EVENT("dequeued (size=%ld,pos=0x%lx)\n",ENI_PRV_SIZE(skb),
                ENI_PRV_POS(skb));
rx_dequeued++;
            vcc = ATM_SKB(skb)->vcc;
            eni_vcc = ENI_VCC(vcc);
            first = 0;
            vci_dsc = eni_dev->vci+vcc->vci*16;
            if (!EEPMOK(eni_vcc->rx_pos,ENI_PRV_SIZE(skb),
                (readl(vci_dsc+4) & MID_VCI_READ) >> MID_VCI_READ_SHIFT,
                eni_vcc->words)) {
                  EVENT("requeuing\n",0,0);
                  skb_queue_head(&eni_dev->rx_queue,skb);
                  break;
            }
            eni_vcc->rxing--;
            eni_vcc->rx_pos = ENI_PRV_POS(skb) & (eni_vcc->words-1);
            pci_unmap_single(eni_dev->pci_dev,ENI_PRV_PADDR(skb),skb->len,
                PCI_DMA_TODEVICE);
            if (!skb->len) dev_kfree_skb_irq(skb);
            else {
                  EVENT("pushing (len=%ld)\n",skb->len,0);
                  if (vcc->qos.aal == ATM_AAL0)
                        *(unsigned long *) skb->data =
                            ntohl(*(unsigned long *) skb->data);
                  memset(skb->cb,0,sizeof(struct eni_skb_prv));
                  vcc->push(vcc,skb);
                  pushed++;
            }
            atomic_inc(&vcc->stats->rx);
      }
      wake_up(&eni_dev->rx_wait);
}


static int open_rx_first(struct atm_vcc *vcc)
{
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;
      unsigned long size;

      DPRINTK("open_rx_first\n");
      eni_dev = ENI_DEV(vcc->dev);
      eni_vcc = ENI_VCC(vcc);
      eni_vcc->rx = NULL;
      if (vcc->qos.rxtp.traffic_class == ATM_NONE) return 0;
      size = vcc->qos.rxtp.max_sdu*eni_dev->rx_mult/100;
      if (size > MID_MAX_BUF_SIZE && vcc->qos.rxtp.max_sdu <=
          MID_MAX_BUF_SIZE)
            size = MID_MAX_BUF_SIZE;
      eni_vcc->recv = eni_alloc_mem(eni_dev,&size);
      DPRINTK("rx at 0x%lx\n",eni_vcc->recv);
      eni_vcc->words = size >> 2;
      if (!eni_vcc->recv) return -ENOBUFS;
      eni_vcc->rx = vcc->qos.aal == ATM_AAL5 ? rx_aal5 : rx_aal0;
      eni_vcc->descr = 0;
      eni_vcc->rx_pos = 0;
      eni_vcc->rxing = 0;
      eni_vcc->servicing = 0;
      eni_vcc->next = ENI_VCC_NOS;
      return 0;
}


static int open_rx_second(struct atm_vcc *vcc)
{
      void __iomem *here;
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;
      unsigned long size;
      int order;

      DPRINTK("open_rx_second\n");
      eni_dev = ENI_DEV(vcc->dev);
      eni_vcc = ENI_VCC(vcc);
      if (!eni_vcc->rx) return 0;
      /* set up VCI descriptor */
      here = eni_dev->vci+vcc->vci*16;
      DPRINTK("loc 0x%x\n",(unsigned) (eni_vcc->recv-eni_dev->ram)/4);
      size = eni_vcc->words >> 8;
      for (order = -1; size; order++) size >>= 1;
      writel(0,here+4); /* descr, read = 0 */
      writel(0,here+8); /* write, state, count = 0 */
      if (eni_dev->rx_map[vcc->vci])
            printk(KERN_CRIT DEV_LABEL "(itf %d): BUG - VCI %d already "
                "in use\n",vcc->dev->number,vcc->vci);
      eni_dev->rx_map[vcc->vci] = vcc; /* now it counts */
      writel(((vcc->qos.aal != ATM_AAL5 ? MID_MODE_RAW : MID_MODE_AAL5) <<
          MID_VCI_MODE_SHIFT) | MID_VCI_PTI_MODE |
          (((eni_vcc->recv-eni_dev->ram) >> (MID_LOC_SKIP+2)) <<
          MID_VCI_LOCATION_SHIFT) | (order << MID_VCI_SIZE_SHIFT),here);
      return 0;
}


static void close_rx(struct atm_vcc *vcc)
{
      DECLARE_WAITQUEUE(wait,current);
      void __iomem *here;
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;

      eni_vcc = ENI_VCC(vcc);
      if (!eni_vcc->rx) return;
      eni_dev = ENI_DEV(vcc->dev);
      if (vcc->vpi != ATM_VPI_UNSPEC && vcc->vci != ATM_VCI_UNSPEC) {
            here = eni_dev->vci+vcc->vci*16;
            /* block receiver */
            writel((readl(here) & ~MID_VCI_MODE) | (MID_MODE_TRASH <<
                MID_VCI_MODE_SHIFT),here);
            /* wait for receiver to become idle */
            udelay(27);
            /* discard pending cell */
            writel(readl(here) & ~MID_VCI_IN_SERVICE,here);
            /* don't accept any new ones */
            eni_dev->rx_map[vcc->vci] = NULL;
            /* wait for RX queue to drain */
            DPRINTK("eni_close: waiting for RX ...\n");
            EVENT("RX closing\n",0,0);
            add_wait_queue(&eni_dev->rx_wait,&wait);
            set_current_state(TASK_UNINTERRUPTIBLE);
            barrier();
            for (;;) {
                  /* transition service->rx: rxing++, servicing-- */
                  if (!eni_vcc->servicing) {
                        barrier();
                        if (!eni_vcc->rxing) break;
                  }
                  EVENT("drain PDUs (rx %ld, serv %ld)\n",eni_vcc->rxing,
                      eni_vcc->servicing);
                  printk(KERN_INFO "%d+%d RX left\n",eni_vcc->servicing,
                      eni_vcc->rxing);
                  schedule();
                  set_current_state(TASK_UNINTERRUPTIBLE);
            }
            for (;;) {
                  int at_end;
                  u32 tmp;

                  tasklet_disable(&eni_dev->task);
                  tmp = readl(eni_dev->vci+vcc->vci*16+4) & MID_VCI_READ;
                  at_end = eni_vcc->rx_pos == tmp >> MID_VCI_READ_SHIFT;
                  tasklet_enable(&eni_dev->task);
                  if (at_end) break;
                  EVENT("drain discard (host 0x%lx, nic 0x%lx)\n",
                      eni_vcc->rx_pos,tmp);
                  printk(KERN_INFO "draining RX: host 0x%lx, nic 0x%x\n",
                      eni_vcc->rx_pos,tmp);
                  schedule();
                  set_current_state(TASK_UNINTERRUPTIBLE);
            }
            set_current_state(TASK_RUNNING);
            remove_wait_queue(&eni_dev->rx_wait,&wait);
      }
      eni_free_mem(eni_dev,eni_vcc->recv,eni_vcc->words << 2);
      eni_vcc->rx = NULL;
}


static int start_rx(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;

      eni_dev = ENI_DEV(dev);
      eni_dev->rx_map = (struct atm_vcc **) get_zeroed_page(GFP_KERNEL);
      if (!eni_dev->rx_map) {
            printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
                dev->number);
            free_page((unsigned long) eni_dev->free_list);
            return -ENOMEM;
      }
      eni_dev->rx_mult = DEFAULT_RX_MULT;
      eni_dev->fast = eni_dev->last_fast = NULL;
      eni_dev->slow = eni_dev->last_slow = NULL;
      init_waitqueue_head(&eni_dev->rx_wait);
      skb_queue_head_init(&eni_dev->rx_queue);
      eni_dev->serv_read = eni_in(MID_SERV_WRITE);
      eni_out(0,MID_DMA_WR_RX);
      return 0;
}


/*----------------------------------- TX ------------------------------------*/


enum enq_res { enq_ok,enq_next,enq_jam };


static inline void put_dma(int chan,u32 *dma,int *j,dma_addr_t paddr,
    u32 size)
{
      u32 init,words;

      DPRINTK("put_dma: 0x%lx+0x%x\n",(unsigned long) paddr,size);
      EVENT("put_dma: 0x%lx+0x%lx\n",(unsigned long) paddr,size);
#if 0 /* don't complain anymore */
      if (paddr & 3)
            printk(KERN_ERR "put_dma: unaligned addr (0x%lx)\n",paddr);
      if (size & 3)
            printk(KERN_ERR "put_dma: unaligned size (0x%lx)\n",size);
#endif
      if (paddr & 3) {
            init = 4-(paddr & 3);
            if (init > size || size < 7) init = size;
            DPRINTK("put_dma: %lx DMA: %d/%d bytes\n",
                (unsigned long) paddr,init,size);
            dma[(*j)++] = MID_DT_BYTE | (init << MID_DMA_COUNT_SHIFT) |
                (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
            paddr += init;
            size -= init;
      }
      words = size >> 2;
      size &= 3;
      if (words && (paddr & 31)) {
            init = 8-((paddr & 31) >> 2);
            if (init > words) init = words;
            DPRINTK("put_dma: %lx DMA: %d/%d words\n",
                (unsigned long) paddr,init,words);
            dma[(*j)++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
                (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
            paddr += init << 2;
            words -= init;
      }
#ifdef CONFIG_ATM_ENI_BURST_TX_16W /* may work with some PCI chipsets ... */
      if (words & ~15) {
            DPRINTK("put_dma: %lx DMA: %d*16/%d words\n",
                (unsigned long) paddr,words >> 4,words);
            dma[(*j)++] = MID_DT_16W | ((words >> 4) << MID_DMA_COUNT_SHIFT)
                | (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
            paddr += (words & ~15) << 2;
            words &= 15;
      }
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_8W /* recommended */
      if (words & ~7) {
            DPRINTK("put_dma: %lx DMA: %d*8/%d words\n",
                (unsigned long) paddr,words >> 3,words);
            dma[(*j)++] = MID_DT_8W | ((words >> 3) << MID_DMA_COUNT_SHIFT)
                | (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
            paddr += (words & ~7) << 2;
            words &= 7;
      }
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_4W /* probably useless if TX_8W or TX_16W */
      if (words & ~3) {
            DPRINTK("put_dma: %lx DMA: %d*4/%d words\n",
                (unsigned long) paddr,words >> 2,words);
            dma[(*j)++] = MID_DT_4W | ((words >> 2) << MID_DMA_COUNT_SHIFT)
                | (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
            paddr += (words & ~3) << 2;
            words &= 3;
      }
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_2W /* probably useless if TX_4W, TX_8W, ... */
      if (words & ~1) {
            DPRINTK("put_dma: %lx DMA: %d*2/%d words\n",
                (unsigned long) paddr,words >> 1,words);
            dma[(*j)++] = MID_DT_2W | ((words >> 1) << MID_DMA_COUNT_SHIFT)
                | (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
            paddr += (words & ~1) << 2;
            words &= 1;
      }
#endif
      if (words) {
            DPRINTK("put_dma: %lx DMA: %d words\n",(unsigned long) paddr,
                words);
            dma[(*j)++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT) |
                (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
            paddr += words << 2;
      }
      if (size) {
            DPRINTK("put_dma: %lx DMA: %d bytes\n",(unsigned long) paddr,
                size);
            dma[(*j)++] = MID_DT_BYTE | (size << MID_DMA_COUNT_SHIFT) |
                (chan << MID_DMA_CHAN_SHIFT);
            dma[(*j)++] = paddr;
      }
}


static enum enq_res do_tx(struct sk_buff *skb)
{
      struct atm_vcc *vcc;
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;
      struct eni_tx *tx;
      dma_addr_t paddr;
      u32 dma_rd,dma_wr;
      u32 size; /* in words */
      int aal5,dma_size,i,j;

      DPRINTK(">do_tx\n");
      NULLCHECK(skb);
      EVENT("do_tx: skb=0x%lx, %ld bytes\n",(unsigned long) skb,skb->len);
      vcc = ATM_SKB(skb)->vcc;
      NULLCHECK(vcc);
      eni_dev = ENI_DEV(vcc->dev);
      NULLCHECK(eni_dev);
      eni_vcc = ENI_VCC(vcc);
      tx = eni_vcc->tx;
      NULLCHECK(tx);
#if 0 /* Enable this for testing with the "align" program */
      {
            unsigned int hack = *((char *) skb->data)-'0';

            if (hack < 8) {
                  skb->data += hack;
                  skb->len -= hack;
            }
      }
#endif
#if 0 /* should work now */
      if ((unsigned long) skb->data & 3)
            printk(KERN_ERR DEV_LABEL "(itf %d): VCI %d has mis-aligned "
                "TX data\n",vcc->dev->number,vcc->vci);
#endif
      /*
       * Potential future IP speedup: make hard_header big enough to put
       * segmentation descriptor directly into PDU. Saves: 4 slave writes,
       * 1 DMA xfer & 2 DMA'ed bytes (protocol layering is for wimps :-)
       */

      aal5 = vcc->qos.aal == ATM_AAL5;
      /* check space in buffer */
      if (!aal5)
            size = (ATM_CELL_PAYLOAD >> 2)+TX_DESCR_SIZE;
                  /* cell without HEC plus segmentation header (includes
                     four-byte cell header) */
      else {
            size = skb->len+4*AAL5_TRAILER+ATM_CELL_PAYLOAD-1;
                  /* add AAL5 trailer */
            size = ((size-(size % ATM_CELL_PAYLOAD)) >> 2)+TX_DESCR_SIZE;
                                    /* add segmentation header */
      }
      /*
       * Can I move tx_pos by size bytes without getting closer than TX_GAP
       * to the read pointer ? TX_GAP means to leave some space for what
       * the manual calls "too close".
       */
      if (!NEPMOK(tx->tx_pos,size+TX_GAP,
          eni_in(MID_TX_RDPTR(tx->index)),tx->words)) {
            DPRINTK(DEV_LABEL "(itf %d): TX full (size %d)\n",
                vcc->dev->number,size);
            return enq_next;
      }
      /* check DMA */
      dma_wr = eni_in(MID_DMA_WR_TX);
      dma_rd = eni_in(MID_DMA_RD_TX);
      dma_size = 3; /* JK for descriptor and final fill, plus final size
                   mis-alignment fix */
DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
      if (!skb_shinfo(skb)->nr_frags) dma_size += 5;
      else dma_size += 5*(skb_shinfo(skb)->nr_frags+1);
      if (dma_size > TX_DMA_BUF) {
            printk(KERN_CRIT DEV_LABEL "(itf %d): needs %d DMA entries "
                "(got only %d)\n",vcc->dev->number,dma_size,TX_DMA_BUF);
      }
      DPRINTK("dma_wr is %d, tx_pos is %ld\n",dma_wr,tx->tx_pos);
      if (dma_wr != dma_rd && ((dma_rd+NR_DMA_TX-dma_wr) & (NR_DMA_TX-1)) <
           dma_size) {
            printk(KERN_WARNING DEV_LABEL "(itf %d): TX DMA full\n",
                vcc->dev->number);
            return enq_jam;
      }
      paddr = pci_map_single(eni_dev->pci_dev,skb->data,skb->len,
          PCI_DMA_TODEVICE);
      ENI_PRV_PADDR(skb) = paddr;
      /* prepare DMA queue entries */
      j = 0;
      eni_dev->dma[j++] = (((tx->tx_pos+TX_DESCR_SIZE) & (tx->words-1)) <<
           MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
           MID_DT_JK;
      j++;
      if (!skb_shinfo(skb)->nr_frags)
            if (aal5) put_dma(tx->index,eni_dev->dma,&j,paddr,skb->len);
            else put_dma(tx->index,eni_dev->dma,&j,paddr+4,skb->len-4);
      else {
DPRINTK("doing direct send\n"); /* @@@ well, this doesn't work anyway */
            for (i = -1; i < skb_shinfo(skb)->nr_frags; i++)
                  if (i == -1)
                        put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
                            skb->data,
                            skb->len - skb->data_len);
                  else
                        put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
                            skb_shinfo(skb)->frags[i].page + skb_shinfo(skb)->frags[i].page_offset,
                            skb_shinfo(skb)->frags[i].size);
      }
      if (skb->len & 3)
            put_dma(tx->index,eni_dev->dma,&j,zeroes,4-(skb->len & 3));
      /* JK for AAL5 trailer - AAL0 doesn't need it, but who cares ... */
      eni_dev->dma[j++] = (((tx->tx_pos+size) & (tx->words-1)) <<
           MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
           MID_DMA_END | MID_DT_JK;
      j++;
      DPRINTK("DMA at end: %d\n",j);
      /* store frame */
      writel((MID_SEG_TX_ID << MID_SEG_ID_SHIFT) |
          (aal5 ? MID_SEG_AAL5 : 0) | (tx->prescaler << MID_SEG_PR_SHIFT) |
          (tx->resolution << MID_SEG_RATE_SHIFT) |
          (size/(ATM_CELL_PAYLOAD/4)),tx->send+tx->tx_pos*4);
/*printk("dsc = 0x%08lx\n",(unsigned long) readl(tx->send+tx->tx_pos*4));*/
      writel((vcc->vci << MID_SEG_VCI_SHIFT) |
            (aal5 ? 0 : (skb->data[3] & 0xf)) |
          (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? MID_SEG_CLP : 0),
          tx->send+((tx->tx_pos+1) & (tx->words-1))*4);
      DPRINTK("size: %d, len:%d\n",size,skb->len);
      if (aal5)
            writel(skb->len,tx->send+
                    ((tx->tx_pos+size-AAL5_TRAILER) & (tx->words-1))*4);
      j = j >> 1;
      for (i = 0; i < j; i++) {
            writel(eni_dev->dma[i*2],eni_dev->tx_dma+dma_wr*8);
            writel(eni_dev->dma[i*2+1],eni_dev->tx_dma+dma_wr*8+4);
            dma_wr = (dma_wr+1) & (NR_DMA_TX-1);
      }
      ENI_PRV_POS(skb) = tx->tx_pos;
      ENI_PRV_SIZE(skb) = size;
      ENI_VCC(vcc)->txing += size;
      tx->tx_pos = (tx->tx_pos+size) & (tx->words-1);
      DPRINTK("dma_wr set to %d, tx_pos is now %ld\n",dma_wr,tx->tx_pos);
      eni_out(dma_wr,MID_DMA_WR_TX);
      skb_queue_tail(&eni_dev->tx_queue,skb);
queued++;
      return enq_ok;
}


static void poll_tx(struct atm_dev *dev)
{
      struct eni_tx *tx;
      struct sk_buff *skb;
      enum enq_res res;
      int i;

      DPRINTK(">poll_tx\n");
      for (i = NR_CHAN-1; i >= 0; i--) {
            tx = &ENI_DEV(dev)->tx[i];
            if (tx->send)
                  while ((skb = skb_dequeue(&tx->backlog))) {
                        res = do_tx(skb);
                        if (res == enq_ok) continue;
                        DPRINTK("re-queuing TX PDU\n");
                        skb_queue_head(&tx->backlog,skb);
requeued++;
                        if (res == enq_jam) return;
                        break;
                  }
      }
}


static void dequeue_tx(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;
      struct atm_vcc *vcc;
      struct sk_buff *skb;
      struct eni_tx *tx;

      NULLCHECK(dev);
      eni_dev = ENI_DEV(dev);
      NULLCHECK(eni_dev);
      while ((skb = skb_dequeue(&eni_dev->tx_queue))) {
            vcc = ATM_SKB(skb)->vcc;
            NULLCHECK(vcc);
            tx = ENI_VCC(vcc)->tx;
            NULLCHECK(ENI_VCC(vcc)->tx);
            DPRINTK("dequeue_tx: next 0x%lx curr 0x%x\n",ENI_PRV_POS(skb),
                (unsigned) eni_in(MID_TX_DESCRSTART(tx->index)));
            if (ENI_VCC(vcc)->txing < tx->words && ENI_PRV_POS(skb) ==
                eni_in(MID_TX_DESCRSTART(tx->index))) {
                  skb_queue_head(&eni_dev->tx_queue,skb);
                  break;
            }
            ENI_VCC(vcc)->txing -= ENI_PRV_SIZE(skb);
            pci_unmap_single(eni_dev->pci_dev,ENI_PRV_PADDR(skb),skb->len,
                PCI_DMA_TODEVICE);
            if (vcc->pop) vcc->pop(vcc,skb);
            else dev_kfree_skb_irq(skb);
            atomic_inc(&vcc->stats->tx);
            wake_up(&eni_dev->tx_wait);
dma_complete++;
      }
}


static struct eni_tx *alloc_tx(struct eni_dev *eni_dev,int ubr)
{
      int i;

      for (i = !ubr; i < NR_CHAN; i++)
            if (!eni_dev->tx[i].send) return eni_dev->tx+i;
      return NULL;
}


static int comp_tx(struct eni_dev *eni_dev,int *pcr,int reserved,int *pre,
    int *res,int unlimited)
{
      static const int pre_div[] = { 4,16,128,2048 };
          /* 2^(((x+2)^2-(x+2))/2+1) */

      if (unlimited) *pre = *res = 0;
      else {
            if (*pcr > 0) {
                  int div;

                  for (*pre = 0; *pre < 3; (*pre)++)
                        if (TS_CLOCK/pre_div[*pre]/64 <= *pcr) break;
                  div = pre_div[*pre]**pcr;
                  DPRINTK("min div %d\n",div);
                  *res = TS_CLOCK/div-1;
            }
            else {
                  int div;

                  if (!*pcr) *pcr = eni_dev->tx_bw+reserved;
                  for (*pre = 3; *pre >= 0; (*pre)--)
                        if (TS_CLOCK/pre_div[*pre]/64 > -*pcr) break;
                  if (*pre < 3) (*pre)++; /* else fail later */
                  div = pre_div[*pre]*-*pcr;
                  DPRINTK("max div %d\n",div);
                  *res = (TS_CLOCK+div-1)/div-1;
            }
            if (*res < 0) *res = 0;
            if (*res > MID_SEG_MAX_RATE) *res = MID_SEG_MAX_RATE;
      }
      *pcr = TS_CLOCK/pre_div[*pre]/(*res+1);
      DPRINTK("out pcr: %d (%d:%d)\n",*pcr,*pre,*res);
      return 0;
}


static int reserve_or_set_tx(struct atm_vcc *vcc,struct atm_trafprm *txtp,
    int set_rsv,int set_shp)
{
      struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
      struct eni_vcc *eni_vcc = ENI_VCC(vcc);
      struct eni_tx *tx;
      unsigned long size;
      void __iomem *mem;
      int rate,ubr,unlimited,new_tx;
      int pre,res,order;
      int error;

      rate = atm_pcr_goal(txtp);
      ubr = txtp->traffic_class == ATM_UBR;
      unlimited = ubr && (!rate || rate <= -ATM_OC3_PCR ||
          rate >= ATM_OC3_PCR);
      if (!unlimited) {
            size = txtp->max_sdu*eni_dev->tx_mult/100;
            if (size > MID_MAX_BUF_SIZE && txtp->max_sdu <=
                MID_MAX_BUF_SIZE)
                  size = MID_MAX_BUF_SIZE;
      }
      else {
            if (eni_dev->ubr) {
                  eni_vcc->tx = eni_dev->ubr;
                  txtp->pcr = ATM_OC3_PCR;
                  return 0;
            }
            size = UBR_BUFFER;
      }
      new_tx = !eni_vcc->tx;
      mem = NULL; /* for gcc */
      if (!new_tx) tx = eni_vcc->tx;
      else {
            mem = eni_alloc_mem(eni_dev,&size);
            if (!mem) return -ENOBUFS;
            tx = alloc_tx(eni_dev,unlimited);
            if (!tx) {
                  eni_free_mem(eni_dev,mem,size);
                  return -EBUSY;
            }
            DPRINTK("got chan %d\n",tx->index);
            tx->reserved = tx->shaping = 0;
            tx->send = mem;
            tx->words = size >> 2;
            skb_queue_head_init(&tx->backlog);
            for (order = 0; size > (1 << (order+10)); order++);
            eni_out((order << MID_SIZE_SHIFT) |
                ((tx->send-eni_dev->ram) >> (MID_LOC_SKIP+2)),
                MID_TX_PLACE(tx->index));
            tx->tx_pos = eni_in(MID_TX_DESCRSTART(tx->index)) &
                MID_DESCR_START;
      }
      error = comp_tx(eni_dev,&rate,tx->reserved,&pre,&res,unlimited);
      if (!error  && txtp->min_pcr > rate) error = -EINVAL;
      if (!error && txtp->max_pcr && txtp->max_pcr != ATM_MAX_PCR &&
          txtp->max_pcr < rate) error = -EINVAL;
      if (!error && !ubr && rate > eni_dev->tx_bw+tx->reserved)
            error = -EINVAL;
      if (!error && set_rsv && !set_shp && rate < tx->shaping)
            error = -EINVAL;
      if (!error && !set_rsv && rate > tx->reserved && !ubr)
            error = -EINVAL;
      if (error) {
            if (new_tx) {
                  tx->send = NULL;
                  eni_free_mem(eni_dev,mem,size);
            }
            return error;
      }
      txtp->pcr = rate;
      if (set_rsv && !ubr) {
            eni_dev->tx_bw += tx->reserved;
            tx->reserved = rate;
            eni_dev->tx_bw -= rate;
      }
      if (set_shp || (unlimited && new_tx)) {
            if (unlimited && new_tx) eni_dev->ubr = tx;
            tx->prescaler = pre;
            tx->resolution = res;
            tx->shaping = rate;
      }
      if (set_shp) eni_vcc->tx = tx;
      DPRINTK("rsv %d shp %d\n",tx->reserved,tx->shaping);
      return 0;
}


static int open_tx_first(struct atm_vcc *vcc)
{
      ENI_VCC(vcc)->tx = NULL;
      if (vcc->qos.txtp.traffic_class == ATM_NONE) return 0;
      ENI_VCC(vcc)->txing = 0;
      return reserve_or_set_tx(vcc,&vcc->qos.txtp,1,1);
}


static int open_tx_second(struct atm_vcc *vcc)
{
      return 0; /* nothing to do */
}


static void close_tx(struct atm_vcc *vcc)
{
      DECLARE_WAITQUEUE(wait,current);
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;

      eni_vcc = ENI_VCC(vcc);
      if (!eni_vcc->tx) return;
      eni_dev = ENI_DEV(vcc->dev);
      /* wait for TX queue to drain */
      DPRINTK("eni_close: waiting for TX ...\n");
      add_wait_queue(&eni_dev->tx_wait,&wait);
      set_current_state(TASK_UNINTERRUPTIBLE);
      for (;;) {
            int txing;

            tasklet_disable(&eni_dev->task);
            txing = skb_peek(&eni_vcc->tx->backlog) || eni_vcc->txing;
            tasklet_enable(&eni_dev->task);
            if (!txing) break;
            DPRINTK("%d TX left\n",eni_vcc->txing);
            schedule();
            set_current_state(TASK_UNINTERRUPTIBLE);
      }
      set_current_state(TASK_RUNNING);
      remove_wait_queue(&eni_dev->tx_wait,&wait);
      if (eni_vcc->tx != eni_dev->ubr) {
            /*
             * Looping a few times in here is probably far cheaper than
             * keeping track of TX completions all the time, so let's poll
             * a bit ...
             */
            while (eni_in(MID_TX_RDPTR(eni_vcc->tx->index)) !=
                eni_in(MID_TX_DESCRSTART(eni_vcc->tx->index)))
                  schedule();
            eni_free_mem(eni_dev,eni_vcc->tx->send,eni_vcc->tx->words << 2);
            eni_vcc->tx->send = NULL;
            eni_dev->tx_bw += eni_vcc->tx->reserved;
      }
      eni_vcc->tx = NULL;
}


static int start_tx(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;
      int i;

      eni_dev = ENI_DEV(dev);
      eni_dev->lost = 0;
      eni_dev->tx_bw = ATM_OC3_PCR;
      eni_dev->tx_mult = DEFAULT_TX_MULT;
      init_waitqueue_head(&eni_dev->tx_wait);
      eni_dev->ubr = NULL;
      skb_queue_head_init(&eni_dev->tx_queue);
      eni_out(0,MID_DMA_WR_TX);
      for (i = 0; i < NR_CHAN; i++) {
            eni_dev->tx[i].send = NULL;
            eni_dev->tx[i].index = i;
      }
      return 0;
}


/*--------------------------------- common ----------------------------------*/


#if 0 /* may become useful again when tuning things */

static void foo(void)
{
printk(KERN_INFO
  "tx_complete=%d,dma_complete=%d,queued=%d,requeued=%d,sub=%d,\n"
  "backlogged=%d,rx_enqueued=%d,rx_dequeued=%d,putting=%d,pushed=%d\n",
  tx_complete,dma_complete,queued,requeued,submitted,backlogged,
  rx_enqueued,rx_dequeued,putting,pushed);
if (eni_boards) printk(KERN_INFO "loss: %ld\n",ENI_DEV(eni_boards)->lost);
}

#endif


static void bug_int(struct atm_dev *dev,unsigned long reason)
{
      struct eni_dev *eni_dev;

      DPRINTK(">bug_int\n");
      eni_dev = ENI_DEV(dev);
      if (reason & MID_DMA_ERR_ACK)
            printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
                "error\n",dev->number);
      if (reason & MID_TX_IDENT_MISM)
            printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - ident "
                "mismatch\n",dev->number);
      if (reason & MID_TX_DMA_OVFL)
            printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
                "overflow\n",dev->number);
      EVENT("---dump ends here---\n",0,0);
      printk(KERN_NOTICE "---recent events---\n");
      event_dump();
}


static irqreturn_t eni_int(int irq,void *dev_id)
{
      struct atm_dev *dev;
      struct eni_dev *eni_dev;
      u32 reason;

      DPRINTK(">eni_int\n");
      dev = dev_id;
      eni_dev = ENI_DEV(dev);
      reason = eni_in(MID_ISA);
      DPRINTK(DEV_LABEL ": int 0x%lx\n",(unsigned long) reason);
      /*
       * Must handle these two right now, because reading ISA doesn't clear
       * them, so they re-occur and we never make it to the tasklet. Since
       * they're rare, we don't mind the occasional invocation of eni_tasklet
       * with eni_dev->events == 0.
       */
      if (reason & MID_STAT_OVFL) {
            EVENT("stat overflow\n",0,0);
            eni_dev->lost += eni_in(MID_STAT) & MID_OVFL_TRASH;
      }
      if (reason & MID_SUNI_INT) {
            EVENT("SUNI int\n",0,0);
            dev->phy->interrupt(dev);
#if 0
            foo();
#endif
      }
      spin_lock(&eni_dev->lock);
      eni_dev->events |= reason;
      spin_unlock(&eni_dev->lock);
      tasklet_schedule(&eni_dev->task);
      return IRQ_HANDLED;
}


static void eni_tasklet(unsigned long data)
{
      struct atm_dev *dev = (struct atm_dev *) data;
      struct eni_dev *eni_dev = ENI_DEV(dev);
      unsigned long flags;
      u32 events;

      DPRINTK("eni_tasklet (dev %p)\n",dev);
      spin_lock_irqsave(&eni_dev->lock,flags);
      events = xchg(&eni_dev->events,0);
      spin_unlock_irqrestore(&eni_dev->lock,flags);
      if (events & MID_RX_DMA_COMPLETE) {
            EVENT("INT: RX DMA complete, starting dequeue_rx\n",0,0);
            dequeue_rx(dev);
            EVENT("dequeue_rx done, starting poll_rx\n",0,0);
            poll_rx(dev);
            EVENT("poll_rx done\n",0,0);
            /* poll_tx ? */
      }
      if (events & MID_SERVICE) {
            EVENT("INT: service, starting get_service\n",0,0);
            get_service(dev);
            EVENT("get_service done, starting poll_rx\n",0,0);
            poll_rx(dev);
            EVENT("poll_rx done\n",0,0);
      }
      if (events & MID_TX_DMA_COMPLETE) {
            EVENT("INT: TX DMA COMPLETE\n",0,0);
            dequeue_tx(dev);
      }
      if (events & MID_TX_COMPLETE) {
            EVENT("INT: TX COMPLETE\n",0,0);
tx_complete++;
            wake_up(&eni_dev->tx_wait);
            /* poll_rx ? */
      }
      if (events & (MID_DMA_ERR_ACK | MID_TX_IDENT_MISM | MID_TX_DMA_OVFL)) {
            EVENT("bug interrupt\n",0,0);
            bug_int(dev,events);
      }
      poll_tx(dev);
}


/*--------------------------------- entries ---------------------------------*/


static const char *media_name[] __devinitdata = {
    "MMF", "SMF", "MMF", "03?", /*  0- 3 */
    "UTP", "05?", "06?", "07?", /*  4- 7 */
    "TAXI","09?", "10?", "11?", /*  8-11 */
    "12?", "13?", "14?", "15?", /* 12-15 */
    "MMF", "SMF", "18?", "19?", /* 16-19 */
    "UTP", "21?", "22?", "23?", /* 20-23 */
    "24?", "25?", "26?", "27?", /* 24-27 */
    "28?", "29?", "30?", "31?"  /* 28-31 */
};


#define SET_SEPROM \
  ({ if (!error && !pci_error) { \
    pci_error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,tonga); \
    udelay(10); /* 10 usecs */ \
  } })
#define GET_SEPROM \
  ({ if (!error && !pci_error) { \
    pci_error = pci_read_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,&tonga); \
    udelay(10); /* 10 usecs */ \
  } })


static int __devinit get_esi_asic(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;
      unsigned char tonga;
      int error,failed,pci_error;
      int address,i,j;

      eni_dev = ENI_DEV(dev);
      error = pci_error = 0;
      tonga = SEPROM_MAGIC | SEPROM_DATA | SEPROM_CLK;
      SET_SEPROM;
      for (i = 0; i < ESI_LEN && !error && !pci_error; i++) {
            /* start operation */
            tonga |= SEPROM_DATA;
            SET_SEPROM;
            tonga |= SEPROM_CLK;
            SET_SEPROM;
            tonga &= ~SEPROM_DATA;
            SET_SEPROM;
            tonga &= ~SEPROM_CLK;
            SET_SEPROM;
            /* send address */
            address = ((i+SEPROM_ESI_BASE) << 1)+1;
            for (j = 7; j >= 0; j--) {
                  tonga = (address >> j) & 1 ? tonga | SEPROM_DATA :
                      tonga & ~SEPROM_DATA;
                  SET_SEPROM;
                  tonga |= SEPROM_CLK;
                  SET_SEPROM;
                  tonga &= ~SEPROM_CLK;
                  SET_SEPROM;
            }
            /* get ack */
            tonga |= SEPROM_DATA;
            SET_SEPROM;
            tonga |= SEPROM_CLK;
            SET_SEPROM;
            GET_SEPROM;
            failed = tonga & SEPROM_DATA;
            tonga &= ~SEPROM_CLK;
            SET_SEPROM;
            tonga |= SEPROM_DATA;
            SET_SEPROM;
            if (failed) error = -EIO;
            else {
                  dev->esi[i] = 0;
                  for (j = 7; j >= 0; j--) {
                        dev->esi[i] <<= 1;
                        tonga |= SEPROM_DATA;
                        SET_SEPROM;
                        tonga |= SEPROM_CLK;
                        SET_SEPROM;
                        GET_SEPROM;
                        if (tonga & SEPROM_DATA) dev->esi[i] |= 1;
                        tonga &= ~SEPROM_CLK;
                        SET_SEPROM;
                        tonga |= SEPROM_DATA;
                        SET_SEPROM;
                  }
                  /* get ack */
                  tonga |= SEPROM_DATA;
                  SET_SEPROM;
                  tonga |= SEPROM_CLK;
                  SET_SEPROM;
                  GET_SEPROM;
                  if (!(tonga & SEPROM_DATA)) error = -EIO;
                  tonga &= ~SEPROM_CLK;
                  SET_SEPROM;
                  tonga |= SEPROM_DATA;
                  SET_SEPROM;
            }
            /* stop operation */
            tonga &= ~SEPROM_DATA;
            SET_SEPROM;
            tonga |= SEPROM_CLK;
            SET_SEPROM;
            tonga |= SEPROM_DATA;
            SET_SEPROM;
      }
      if (pci_error) {
            printk(KERN_ERR DEV_LABEL "(itf %d): error reading ESI "
                "(0x%02x)\n",dev->number,pci_error);
            error = -EIO;
      }
      return error;
}


#undef SET_SEPROM
#undef GET_SEPROM


static int __devinit get_esi_fpga(struct atm_dev *dev, void __iomem *base)
{
      void __iomem *mac_base;
      int i;

      mac_base = base+EPROM_SIZE-sizeof(struct midway_eprom);
      for (i = 0; i < ESI_LEN; i++) dev->esi[i] = readb(mac_base+(i^3));
      return 0;
}


static int __devinit eni_do_init(struct atm_dev *dev)
{
      struct midway_eprom __iomem *eprom;
      struct eni_dev *eni_dev;
      struct pci_dev *pci_dev;
      unsigned long real_base;
      void __iomem *base;
      int error,i,last;

      DPRINTK(">eni_init\n");
      dev->ci_range.vpi_bits = 0;
      dev->ci_range.vci_bits = NR_VCI_LD;
      dev->link_rate = ATM_OC3_PCR;
      eni_dev = ENI_DEV(dev);
      pci_dev = eni_dev->pci_dev;
      real_base = pci_resource_start(pci_dev, 0);
      eni_dev->irq = pci_dev->irq;
      if ((error = pci_write_config_word(pci_dev,PCI_COMMAND,
          PCI_COMMAND_MEMORY |
          (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
            printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory "
                "(0x%02x)\n",dev->number,error);
            return -EIO;
      }
      printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%lx,irq=%d,",
          dev->number,pci_dev->revision,real_base,eni_dev->irq);
      if (!(base = ioremap_nocache(real_base,MAP_MAX_SIZE))) {
            printk("\n");
            printk(KERN_ERR DEV_LABEL "(itf %d): can't set up page "
                "mapping\n",dev->number);
            return error;
      }
      eni_dev->base_diff = real_base - (unsigned long) base;
      /* id may not be present in ASIC Tonga boards - check this @@@ */
      if (!eni_dev->asic) {
            eprom = (base+EPROM_SIZE-sizeof(struct midway_eprom));
            if (readl(&eprom->magic) != ENI155_MAGIC) {
                  printk("\n");
                  printk(KERN_ERR KERN_ERR DEV_LABEL "(itf %d): bad "
                      "magic - expected 0x%x, got 0x%x\n",dev->number,
                      ENI155_MAGIC,(unsigned) readl(&eprom->magic));
                  error = -EINVAL;
                  goto unmap;
            }
      }
      eni_dev->phy = base+PHY_BASE;
      eni_dev->reg = base+REG_BASE;
      eni_dev->ram = base+RAM_BASE;
      last = MAP_MAX_SIZE-RAM_BASE;
      for (i = last-RAM_INCREMENT; i >= 0; i -= RAM_INCREMENT) {
            writel(0x55555555,eni_dev->ram+i);
            if (readl(eni_dev->ram+i) != 0x55555555) last = i;
            else {
                  writel(0xAAAAAAAA,eni_dev->ram+i);
                  if (readl(eni_dev->ram+i) != 0xAAAAAAAA) last = i;
                  else writel(i,eni_dev->ram+i);
            }
      }
      for (i = 0; i < last; i += RAM_INCREMENT)
            if (readl(eni_dev->ram+i) != i) break;
      eni_dev->mem = i;
      memset_io(eni_dev->ram,0,eni_dev->mem);
      /* TODO: should shrink allocation now */
      printk("mem=%dkB (",eni_dev->mem >> 10);
      /* TODO: check for non-SUNI, check for TAXI ? */
      if (!(eni_in(MID_RES_ID_MCON) & 0x200) != !eni_dev->asic) {
            printk(")\n");
            printk(KERN_ERR DEV_LABEL "(itf %d): ERROR - wrong id 0x%x\n",
                dev->number,(unsigned) eni_in(MID_RES_ID_MCON));
            error = -EINVAL;
            goto unmap;
      }
      error = eni_dev->asic ? get_esi_asic(dev) : get_esi_fpga(dev,base);
      if (error)
            goto unmap;
      for (i = 0; i < ESI_LEN; i++)
            printk("%s%02X",i ? "-" : "",dev->esi[i]);
      printk(")\n");
      printk(KERN_NOTICE DEV_LABEL "(itf %d): %s,%s\n",dev->number,
          eni_in(MID_RES_ID_MCON) & 0x200 ? "ASIC" : "FPGA",
          media_name[eni_in(MID_RES_ID_MCON) & DAUGTHER_ID]);

      error = suni_init(dev);
      if (error)
            goto unmap;
out:
      return error;
unmap:
      iounmap(base);
      goto out;
}


static int __devinit eni_start(struct atm_dev *dev)
{
      struct eni_dev *eni_dev;
      
      void __iomem *buf;
      unsigned long buffer_mem;
      int error;

      DPRINTK(">eni_start\n");
      eni_dev = ENI_DEV(dev);
      if (request_irq(eni_dev->irq,&eni_int,IRQF_SHARED,DEV_LABEL,dev)) {
            printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",
                dev->number,eni_dev->irq);
            error = -EAGAIN;
            goto out;
      }
      pci_set_master(eni_dev->pci_dev);
      if ((error = pci_write_config_word(eni_dev->pci_dev,PCI_COMMAND,
          PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
          (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
            printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory+"
                "master (0x%02x)\n",dev->number,error);
            goto free_irq;
      }
      if ((error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,
          END_SWAP_DMA))) {
            printk(KERN_ERR DEV_LABEL "(itf %d): can't set endian swap "
                "(0x%02x)\n",dev->number,error);
            goto free_irq;
      }
      /* determine addresses of internal tables */
      eni_dev->vci = eni_dev->ram;
      eni_dev->rx_dma = eni_dev->ram+NR_VCI*16;
      eni_dev->tx_dma = eni_dev->rx_dma+NR_DMA_RX*8;
      eni_dev->service = eni_dev->tx_dma+NR_DMA_TX*8;
      buf = eni_dev->service+NR_SERVICE*4;
      DPRINTK("vci 0x%lx,rx 0x%lx, tx 0x%lx,srv 0x%lx,buf 0x%lx\n",
           eni_dev->vci,eni_dev->rx_dma,eni_dev->tx_dma,
           eni_dev->service,buf);
      spin_lock_init(&eni_dev->lock);
      tasklet_init(&eni_dev->task,eni_tasklet,(unsigned long) dev);
      eni_dev->events = 0;
      /* initialize memory management */
      buffer_mem = eni_dev->mem - (buf - eni_dev->ram);
      eni_dev->free_list_size = buffer_mem/MID_MIN_BUF_SIZE/2;
      eni_dev->free_list = kmalloc(
          sizeof(struct eni_free)*(eni_dev->free_list_size+1),GFP_KERNEL);
      if (!eni_dev->free_list) {
            printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
                dev->number);
            error = -ENOMEM;
            goto free_irq;
      }
      eni_dev->free_len = 0;
      eni_put_free(eni_dev,buf,buffer_mem);
      memset_io(eni_dev->vci,0,16*NR_VCI); /* clear VCI table */
      /*
       * byte_addr  free (k)
       * 0x00000000     512  VCI table
       * 0x00004000       496  RX DMA
       * 0x00005000       492  TX DMA
       * 0x00006000       488  service list
       * 0x00007000       484  buffers
       * 0x00080000         0  end (512kB)
       */
      eni_out(0xffffffff,MID_IE);
      error = start_tx(dev);
      if (error) goto free_list;
      error = start_rx(dev);
      if (error) goto free_list;
      error = dev->phy->start(dev);
      if (error) goto free_list;
      eni_out(eni_in(MID_MC_S) | (1 << MID_INT_SEL_SHIFT) |
          MID_TX_LOCK_MODE | MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE,
          MID_MC_S);
          /* Tonga uses SBus INTReq1 */
      (void) eni_in(MID_ISA); /* clear Midway interrupts */
      return 0;

free_list:
      kfree(eni_dev->free_list);

free_irq:
      free_irq(eni_dev->irq, eni_dev);

out:
      return error;
}


static void eni_close(struct atm_vcc *vcc)
{
      DPRINTK(">eni_close\n");
      if (!ENI_VCC(vcc)) return;
      clear_bit(ATM_VF_READY,&vcc->flags);
      close_rx(vcc);
      close_tx(vcc);
      DPRINTK("eni_close: done waiting\n");
      /* deallocate memory */
      kfree(ENI_VCC(vcc));
      vcc->dev_data = NULL;
      clear_bit(ATM_VF_ADDR,&vcc->flags);
      /*foo();*/
}


static int eni_open(struct atm_vcc *vcc)
{
      struct eni_dev *eni_dev;
      struct eni_vcc *eni_vcc;
      int error;
      short vpi = vcc->vpi;
      int vci = vcc->vci;

      DPRINTK(">eni_open\n");
      EVENT("eni_open\n",0,0);
      if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
            vcc->dev_data = NULL;
      eni_dev = ENI_DEV(vcc->dev);
      if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
            set_bit(ATM_VF_ADDR,&vcc->flags);
      if (vcc->qos.aal != ATM_AAL0 && vcc->qos.aal != ATM_AAL5)
            return -EINVAL;
      DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
          vcc->vci);
      if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
            eni_vcc = kmalloc(sizeof(struct eni_vcc),GFP_KERNEL);
            if (!eni_vcc) return -ENOMEM;
            vcc->dev_data = eni_vcc;
            eni_vcc->tx = NULL; /* for eni_close after open_rx */
            if ((error = open_rx_first(vcc))) {
                  eni_close(vcc);
                  return error;
            }
            if ((error = open_tx_first(vcc))) {
                  eni_close(vcc);
                  return error;
            }
      }
      if (vci == ATM_VPI_UNSPEC || vpi == ATM_VCI_UNSPEC) return 0;
      if ((error = open_rx_second(vcc))) {
            eni_close(vcc);
            return error;
      }
      if ((error = open_tx_second(vcc))) {
            eni_close(vcc);
            return error;
      }
      set_bit(ATM_VF_READY,&vcc->flags);
      /* should power down SUNI while !ref_count @@@ */
      return 0;
}


static int eni_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flgs)
{
      struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
      struct eni_tx *tx = ENI_VCC(vcc)->tx;
      struct sk_buff *skb;
      int error,rate,rsv,shp;

      if (qos->txtp.traffic_class == ATM_NONE) return 0;
      if (tx == eni_dev->ubr) return -EBADFD;
      rate = atm_pcr_goal(&qos->txtp);
      if (rate < 0) rate = -rate;
      rsv = shp = 0;
      if ((flgs & ATM_MF_DEC_RSV) && rate && rate < tx->reserved) rsv = 1;
      if ((flgs & ATM_MF_INC_RSV) && (!rate || rate > tx->reserved)) rsv = 1;
      if ((flgs & ATM_MF_DEC_SHP) && rate && rate < tx->shaping) shp = 1;
      if ((flgs & ATM_MF_INC_SHP) && (!rate || rate > tx->shaping)) shp = 1;
      if (!rsv && !shp) return 0;
      error = reserve_or_set_tx(vcc,&qos->txtp,rsv,shp);
      if (error) return error;
      if (shp && !(flgs & ATM_MF_IMMED)) return 0;
      /*
       * Walk through the send buffer and patch the rate information in all
       * segmentation buffer descriptors of this VCC.
       */
      tasklet_disable(&eni_dev->task);
      skb_queue_walk(&eni_dev->tx_queue, skb) {
            void __iomem *dsc;

            if (ATM_SKB(skb)->vcc != vcc) continue;
            dsc = tx->send+ENI_PRV_POS(skb)*4;
            writel((readl(dsc) & ~(MID_SEG_RATE | MID_SEG_PR)) |
                (tx->prescaler << MID_SEG_PR_SHIFT) |
                (tx->resolution << MID_SEG_RATE_SHIFT), dsc);
      }
      tasklet_enable(&eni_dev->task);
      return 0;
}


static int eni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
{
      struct eni_dev *eni_dev = ENI_DEV(dev);

      if (cmd == ENI_MEMDUMP) {
            if (!capable(CAP_NET_ADMIN)) return -EPERM;
            printk(KERN_WARNING "Please use /proc/atm/" DEV_LABEL ":%d "
                "instead of obsolete ioctl ENI_MEMDUMP\n",dev->number);
            dump(dev);
            return 0;
      }
      if (cmd == ENI_SETMULT) {
            struct eni_multipliers mult;

            if (!capable(CAP_NET_ADMIN)) return -EPERM;
            if (copy_from_user(&mult, arg,
                sizeof(struct eni_multipliers)))
                  return -EFAULT;
            if ((mult.tx && mult.tx <= 100) || (mult.rx &&mult.rx <= 100) ||
                mult.tx > 65536 || mult.rx > 65536)
                  return -EINVAL;
            if (mult.tx) eni_dev->tx_mult = mult.tx;
            if (mult.rx) eni_dev->rx_mult = mult.rx;
            return 0;
      }
      if (cmd == ATM_SETCIRANGE) {
            struct atm_cirange ci;

            if (copy_from_user(&ci, arg,sizeof(struct atm_cirange)))
                  return -EFAULT;
            if ((ci.vpi_bits == 0 || ci.vpi_bits == ATM_CI_MAX) &&
                (ci.vci_bits == NR_VCI_LD || ci.vpi_bits == ATM_CI_MAX))
                return 0;
            return -EINVAL;
      }
      if (!dev->phy->ioctl) return -ENOIOCTLCMD;
      return dev->phy->ioctl(dev,cmd,arg);
}


static int eni_getsockopt(struct atm_vcc *vcc,int level,int optname,
    void __user *optval,int optlen)
{
      return -EINVAL;
}


static int eni_setsockopt(struct atm_vcc *vcc,int level,int optname,
    void __user *optval,int optlen)
{
      return -EINVAL;
}


static int eni_send(struct atm_vcc *vcc,struct sk_buff *skb)
{
      enum enq_res res;

      DPRINTK(">eni_send\n");
      if (!ENI_VCC(vcc)->tx) {
            if (vcc->pop) vcc->pop(vcc,skb);
            else dev_kfree_skb(skb);
            return -EINVAL;
      }
      if (!skb) {
            printk(KERN_CRIT "!skb in eni_send ?\n");
            if (vcc->pop) vcc->pop(vcc,skb);
            return -EINVAL;
      }
      if (vcc->qos.aal == ATM_AAL0) {
            if (skb->len != ATM_CELL_SIZE-1) {
                  if (vcc->pop) vcc->pop(vcc,skb);
                  else dev_kfree_skb(skb);
                  return -EINVAL;
            }
            *(u32 *) skb->data = htonl(*(u32 *) skb->data);
      }
submitted++;
      ATM_SKB(skb)->vcc = vcc;
      tasklet_disable(&ENI_DEV(vcc->dev)->task);
      res = do_tx(skb);
      tasklet_enable(&ENI_DEV(vcc->dev)->task);
      if (res == enq_ok) return 0;
      skb_queue_tail(&ENI_VCC(vcc)->tx->backlog,skb);
backlogged++;
      tasklet_schedule(&ENI_DEV(vcc->dev)->task);
      return 0;
}

static void eni_phy_put(struct atm_dev *dev,unsigned char value,
    unsigned long addr)
{
      writel(value,ENI_DEV(dev)->phy+addr*4);
}



static unsigned char eni_phy_get(struct atm_dev *dev,unsigned long addr)
{
      return readl(ENI_DEV(dev)->phy+addr*4);
}


static int eni_proc_read(struct atm_dev *dev,loff_t *pos,char *page)
{
      struct hlist_node *node;
      struct sock *s;
      static const char *signal[] = { "LOST","unknown","okay" };
      struct eni_dev *eni_dev = ENI_DEV(dev);
      struct atm_vcc *vcc;
      int left,i;

      left = *pos;
      if (!left)
            return sprintf(page,DEV_LABEL "(itf %d) signal %s, %dkB, "
                "%d cps remaining\n",dev->number,signal[(int) dev->signal],
                eni_dev->mem >> 10,eni_dev->tx_bw);
      if (!--left)
            return sprintf(page,"%4sBursts: TX"
#if !defined(CONFIG_ATM_ENI_BURST_TX_16W) && \
    !defined(CONFIG_ATM_ENI_BURST_TX_8W) && \
    !defined(CONFIG_ATM_ENI_BURST_TX_4W) && \
    !defined(CONFIG_ATM_ENI_BURST_TX_2W)
                " none"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_16W
                " 16W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_8W
                " 8W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_4W
                " 4W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_TX_2W
                " 2W"
#endif
                ", RX"
#if !defined(CONFIG_ATM_ENI_BURST_RX_16W) && \
    !defined(CONFIG_ATM_ENI_BURST_RX_8W) && \
    !defined(CONFIG_ATM_ENI_BURST_RX_4W) && \
    !defined(CONFIG_ATM_ENI_BURST_RX_2W)
                " none"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_16W
                " 16W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_8W
                " 8W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_4W
                " 4W"
#endif
#ifdef CONFIG_ATM_ENI_BURST_RX_2W
                " 2W"
#endif
#ifndef CONFIG_ATM_ENI_TUNE_BURST
                " (default)"
#endif
                "\n","");
      if (!--left) 
            return sprintf(page,"%4sBuffer multipliers: tx %d%%, rx %d%%\n",
                "",eni_dev->tx_mult,eni_dev->rx_mult);
      for (i = 0; i < NR_CHAN; i++) {
            struct eni_tx *tx = eni_dev->tx+i;

            if (!tx->send) continue;
            if (!--left) {
                  return sprintf(page,"tx[%d]:    0x%ld-0x%ld "
                      "(%6ld bytes), rsv %d cps, shp %d cps%s\n",i,
                      (unsigned long) (tx->send - eni_dev->ram),
                      tx->send-eni_dev->ram+tx->words*4-1,tx->words*4,
                      tx->reserved,tx->shaping,
                      tx == eni_dev->ubr ? " (UBR)" : "");
            }
            if (--left) continue;
            return sprintf(page,"%10sbacklog %u packets\n","",
                skb_queue_len(&tx->backlog));
      }
      read_lock(&vcc_sklist_lock);
      for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
            struct hlist_head *head = &vcc_hash[i];

            sk_for_each(s, node, head) {
                  struct eni_vcc *eni_vcc;
                  int length;

                  vcc = atm_sk(s);
                  if (vcc->dev != dev)
                        continue;
                  eni_vcc = ENI_VCC(vcc);
                  if (--left) continue;
                  length = sprintf(page,"vcc %4d: ",vcc->vci);
                  if (eni_vcc->rx) {
                        length += sprintf(page+length,"0x%ld-0x%ld "
                            "(%6ld bytes)",
                            (unsigned long) (eni_vcc->recv - eni_dev->ram),
                            eni_vcc->recv-eni_dev->ram+eni_vcc->words*4-1,
                            eni_vcc->words*4);
                        if (eni_vcc->tx) length += sprintf(page+length,", ");
                  }
                  if (eni_vcc->tx)
                        length += sprintf(page+length,"tx[%d], txing %d bytes",
                            eni_vcc->tx->index,eni_vcc->txing);
                  page[length] = '\n';
                  read_unlock(&vcc_sklist_lock);
                  return length+1;
            }
      }
      read_unlock(&vcc_sklist_lock);
      for (i = 0; i < eni_dev->free_len; i++) {
            struct eni_free *fe = eni_dev->free_list+i;
            unsigned long offset;

            if (--left) continue;
            offset = (unsigned long) eni_dev->ram+eni_dev->base_diff;
            return sprintf(page,"free      %p-%p (%6d bytes)\n",
                fe->start-offset,fe->start-offset+(1 << fe->order)-1,
                1 << fe->order);
      }
      return 0;
}


static const struct atmdev_ops ops = {
      .open       = eni_open,
      .close            = eni_close,
      .ioctl            = eni_ioctl,
      .getsockopt = eni_getsockopt,
      .setsockopt = eni_setsockopt,
      .send       = eni_send,
      .phy_put    = eni_phy_put,
      .phy_get    = eni_phy_get,
      .change_qos = eni_change_qos,
      .proc_read  = eni_proc_read
};


static int __devinit eni_init_one(struct pci_dev *pci_dev,
    const struct pci_device_id *ent)
{
      struct atm_dev *dev;
      struct eni_dev *eni_dev;
      int error = -ENOMEM;

      DPRINTK("eni_init_one\n");

      if (pci_enable_device(pci_dev)) {
            error = -EIO;
            goto out0;
      }

      eni_dev = kmalloc(sizeof(struct eni_dev),GFP_KERNEL);
      if (!eni_dev) goto out0;
      if (!cpu_zeroes) {
            cpu_zeroes = pci_alloc_consistent(pci_dev,ENI_ZEROES_SIZE,
                &zeroes);
            if (!cpu_zeroes) goto out1;
      }
      dev = atm_dev_register(DEV_LABEL,&ops,-1,NULL);
      if (!dev) goto out2;
      pci_set_drvdata(pci_dev, dev);
      eni_dev->pci_dev = pci_dev;
      dev->dev_data = eni_dev;
      eni_dev->asic = ent->driver_data;
      error = eni_do_init(dev);
      if (error) goto out3;
      error = eni_start(dev);
      if (error) goto out3;
      eni_dev->more = eni_boards;
      eni_boards = dev;
      return 0;
out3:
      atm_dev_deregister(dev);
out2:
      pci_free_consistent(eni_dev->pci_dev,ENI_ZEROES_SIZE,cpu_zeroes,zeroes);
      cpu_zeroes = NULL;
out1:
      kfree(eni_dev);
out0:
      return error;
}


static struct pci_device_id eni_pci_tbl[] = {
      { PCI_VENDOR_ID_EF, PCI_DEVICE_ID_EF_ATM_FPGA, PCI_ANY_ID, PCI_ANY_ID,
        0, 0, 0 /* FPGA */ },
      { PCI_VENDOR_ID_EF, PCI_DEVICE_ID_EF_ATM_ASIC, PCI_ANY_ID, PCI_ANY_ID,
        0, 0, 1 /* ASIC */ },
      { 0, }
};
MODULE_DEVICE_TABLE(pci,eni_pci_tbl);


static void __devexit eni_remove_one(struct pci_dev *pci_dev)
{
      /* grrr */
}


static struct pci_driver eni_driver = {
      .name       = DEV_LABEL,
      .id_table   = eni_pci_tbl,
      .probe            = eni_init_one,
      .remove           = __devexit_p(eni_remove_one),
};


static int __init eni_init(void)
{
      struct sk_buff *skb; /* dummy for sizeof */

      if (sizeof(skb->cb) < sizeof(struct eni_skb_prv)) {
            printk(KERN_ERR "eni_detect: skb->cb is too small (%Zd < %Zd)\n",
                sizeof(skb->cb),sizeof(struct eni_skb_prv));
            return -EIO;
      }
      return pci_register_driver(&eni_driver);
}


module_init(eni_init);
/* @@@ since exit routine not defined, this module can not be unloaded */

MODULE_LICENSE("GPL");

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