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   1 /* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
   2
   3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4
   5
   6 #include <linux/module.h>
   7 #include <linux/kernel.h>
   8 #include <linux/mm.h>
   9 #include <linux/pci.h>
  10 #include <linux/errno.h>
  11 #include <linux/atm.h>
  12 #include <linux/atmdev.h>
  13 #include <linux/sonet.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/time.h>
  16 #include <linux/delay.h>
  17 #include <linux/uio.h>
  18 #include <linux/init.h>
  19 #include <linux/atm_eni.h>
  20 #include <linux/bitops.h>
  21 #include <asm/system.h>
  22 #include <asm/io.h>
  23 #include <asm/atomic.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/string.h>
  26 #include <asm/byteorder.h>
  27
  28 #include "tonga.h"
  29 #include "midway.h"
  30 #include "suni.h"
  31 #include "eni.h"
  32
  33 #if !defined(__i386__) && !defined(__x86_64__)
  34 #ifndef ioremap_nocache
  35 #define ioremap_nocache(X,Y) ioremap(X,Y)
  36 #endif
  37 #endif
  38
  39 /*
  40  * TODO:
  41  *
  42  * Show stoppers
  43  *  none
  44  *
  45  * Minor
  46  *  - OAM support
  47  *  - fix bugs listed below
  48  */
  49
  50 /*
  51  * KNOWN BUGS:
  52  *
  53  * - may run into JK-JK bug and deadlock
  54  * - should allocate UBR channel first
  55  * - buffer space allocation algorithm is stupid
  56  *   (RX: should be maxSDU+maxdelay*rate
  57  *    TX: should be maxSDU+min(maxSDU,maxdelay*rate) )
  58  * - doesn't support OAM cells
  59  * - eni_put_free may hang if not putting memory fragments that _complete_
  60  *   2^n block (never happens in real life, though)
  61  */
  62
  63
  64 #if 0
  65 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  66 #else
  67 #define DPRINTK(format,args...)
  68 #endif
  69
  70
  71 #ifndef CONFIG_ATM_ENI_TUNE_BURST
  72 #define CONFIG_ATM_ENI_BURST_TX_8W
  73 #define CONFIG_ATM_ENI_BURST_RX_4W
  74 #endif
  75
  76
  77 #ifndef CONFIG_ATM_ENI_DEBUG
  78
  79
  80 #define NULLCHECK(x)
  81
  82 #define EVENT(s,a,b)
  83
  84
  85 static void event_dump(void)
  86 {
  87 }
  88
  89
  90 #else
  91
  92
  93 /*
  94  * NULL pointer checking
  95  */
  96
  97 #define NULLCHECK(x) \
  98         if ((unsigned long) (x) < 0x30) \
  99                 printk(KERN_CRIT #x "==0x%lx\n",(unsigned long) (x))
 100
 101 /*
 102  * Very extensive activity logging. Greatly improves bug detection speed but
 103  * costs a few Mbps if enabled.
 104  */
 105
 106 #define EV 64
 107
 108 static const char *ev[EV];
 109 static unsigned long ev_a[EV],ev_b[EV];
 110 static int ec = 0;
 111
 112
 113 static void EVENT(const char *s,unsigned long a,unsigned long b)
 114 {
 115         ev[ec] = s;
 116         ev_a[ec] = a;
 117         ev_b[ec] = b;
 118         ec = (ec+1) % EV;
 119 }
 120
 121
 122 static void event_dump(void)
 123 {
 124         int n,i;
 125
 126         for (n = 0; n < EV; n++) {
 127                 i = (ec+n) % EV;
 128                 printk(KERN_NOTICE);
 129                 printk(ev[i] ? ev[i] : "(null)",ev_a[i],ev_b[i]);
 130         }
 131 }
 132
 133
 134 #endif /* CONFIG_ATM_ENI_DEBUG */
 135
 136
 137 /*
 138  * NExx   must not be equal at end
 139  * EExx   may be equal at end
 140  * xxPJOK verify validity of pointer jumps
 141  * xxPMOK operating on a circular buffer of "c" words
 142  */
 143
 144 #define NEPJOK(a0,a1,b) \
 145     ((a0) < (a1) ? (b) <= (a0) || (b) > (a1) : (b) <= (a0) && (b) > (a1))
 146 #define EEPJOK(a0,a1,b) \
 147     ((a0) < (a1) ? (b) < (a0) || (b) >= (a1) : (b) < (a0) && (b) >= (a1))
 148 #define NEPMOK(a0,d,b,c) NEPJOK(a0,(a0+d) & (c-1),b)
 149 #define EEPMOK(a0,d,b,c) EEPJOK(a0,(a0+d) & (c-1),b)
 150
 151
 152 static int tx_complete = 0,dma_complete = 0,queued = 0,requeued = 0,
 153   backlogged = 0,rx_enqueued = 0,rx_dequeued = 0,pushed = 0,submitted = 0,
 154   putting = 0;
 155
 156 static struct atm_dev *eni_boards = NULL;
 157
 158 static u32 *cpu_zeroes = NULL; /* aligned "magic" zeroes */
 159 static dma_addr_t zeroes;
 160
 161 /* Read/write registers on card */
 162 #define eni_in(r)       readl(eni_dev->reg+(r)*4)
 163 #define eni_out(v,r)    writel((v),eni_dev->reg+(r)*4)
 164
 165
 166 /*-------------------------------- utilities --------------------------------*/
 167
 168
 169 static void dump_mem(struct eni_dev *eni_dev)
 170 {
 171         int i;
 172
 173         for (i = 0; i < eni_dev->free_len; i++)
 174                 printk(KERN_DEBUG "  %d: %p %d\n",i,
 175                     eni_dev->free_list[i].start,
 176                     1 << eni_dev->free_list[i].order);
 177 }
 178
 179
 180 static void dump(struct atm_dev *dev)
 181 {
 182         struct eni_dev *eni_dev;
 183
 184         int i;
 185
 186         eni_dev = ENI_DEV(dev);
 187         printk(KERN_NOTICE "Free memory\n");
 188         dump_mem(eni_dev);
 189         printk(KERN_NOTICE "TX buffers\n");
 190         for (i = 0; i < NR_CHAN; i++)
 191                 if (eni_dev->tx[i].send)
 192                         printk(KERN_NOTICE "  TX %d @ %p: %ld\n",i,
 193                             eni_dev->tx[i].send,eni_dev->tx[i].words*4);
 194         printk(KERN_NOTICE "RX buffers\n");
 195         for (i = 0; i < 1024; i++)
 196                 if (eni_dev->rx_map[i] && ENI_VCC(eni_dev->rx_map[i])->rx)
 197                         printk(KERN_NOTICE "  RX %d @ %p: %ld\n",i,
 198                             ENI_VCC(eni_dev->rx_map[i])->recv,
 199                             ENI_VCC(eni_dev->rx_map[i])->words*4);
 200         printk(KERN_NOTICE "----\n");
 201 }
 202
 203
 204 static void eni_put_free(struct eni_dev *eni_dev, void __iomem *start,
 205     unsigned long size)
 206 {
 207         struct eni_free *list;
 208         int len,order;
 209
 210         DPRINTK("init 0x%lx+%ld(0x%lx)\n",start,size,size);
 211         start += eni_dev->base_diff;
 212         list = eni_dev->free_list;
 213         len = eni_dev->free_len;
 214         while (size) {
 215                 if (len >= eni_dev->free_list_size) {
 216                         printk(KERN_CRIT "eni_put_free overflow (%p,%ld)\n",
 217                             start,size);
 218                         break;
 219                 }
 220                 for (order = 0; !(((unsigned long)start | size) & (1 << order)); order++);
 221                 if (MID_MIN_BUF_SIZE > (1 << order)) {
 222                         printk(KERN_CRIT "eni_put_free: order %d too small\n",
 223                             order);
 224                         break;
 225                 }
 226                 list[len].start = (void __iomem *) start;
 227                 list[len].order = order;
 228                 len++;
 229                 start += 1 << order;
 230                 size -= 1 << order;
 231         }
 232         eni_dev->free_len = len;
 233         /*dump_mem(eni_dev);*/
 234 }
 235
 236
 237 static void __iomem *eni_alloc_mem(struct eni_dev *eni_dev, unsigned long *size)
 238 {
 239         struct eni_free *list;
 240         void __iomem *start;
 241         int len,i,order,best_order,index;
 242
 243         list = eni_dev->free_list;
 244         len = eni_dev->free_len;
 245         if (*size < MID_MIN_BUF_SIZE) *size = MID_MIN_BUF_SIZE;
 246         if (*size > MID_MAX_BUF_SIZE) return NULL;
 247         for (order = 0; (1 << order) < *size; order++);
 248         DPRINTK("trying: %ld->%d\n",*size,order);
 249         best_order = 65; /* we don't have more than 2^64 of anything ... */
 250         index = 0; /* silence GCC */
 251         for (i = 0; i < len; i++)
 252                 if (list[i].order == order) {
 253                         best_order = order;
 254                         index = i;
 255                         break;
 256                 }
 257                 else if (best_order > list[i].order && list[i].order > order) {
 258                                 best_order = list[i].order;
 259                                 index = i;
 260                         }
 261         if (best_order == 65) return NULL;
 262         start = list[index].start-eni_dev->base_diff;
 263         list[index] = list[--len];
 264         eni_dev->free_len = len;
 265         *size = 1 << order;
 266         eni_put_free(eni_dev,start+*size,(1 << best_order)-*size);
 267         DPRINTK("%ld bytes (order %d) at 0x%lx\n",*size,order,start);
 268         memset_io(start,0,*size);       /* never leak data */
 269         /*dump_mem(eni_dev);*/
 270         return start;
 271 }
 272
 273
 274 static void eni_free_mem(struct eni_dev *eni_dev, void __iomem *start,
 275     unsigned long size)
 276 {
 277         struct eni_free *list;
 278         int len,i,order;
 279
 280         start += eni_dev->base_diff;
 281         list = eni_dev->free_list;
 282         len = eni_dev->free_len;
 283         for (order = -1; size; order++) size >>= 1;
 284         DPRINTK("eni_free_mem: %p+0x%lx (order %d)\n",start,size,order);
 285         for (i = 0; i < len; i++)
 286                 if (((unsigned long) list[i].start) == ((unsigned long)start^(1 << order)) &&
 287                     list[i].order == order) {
 288                         DPRINTK("match[%d]: 0x%lx/0x%lx(0x%x), %d/%d\n",i,
 289                             list[i].start,start,1 << order,list[i].order,order);
 290                         list[i] = list[--len];
 291                         start = (void __iomem *) ((unsigned long) start & ~(unsigned long) (1 << order));
 292                         order++;
 293                         i = -1;
 294                         continue;
 295                 }
 296         if (len >= eni_dev->free_list_size) {
 297                 printk(KERN_ALERT "eni_free_mem overflow (%p,%d)\n",start,
 298                     order);
 299                 return;
 300         }
 301         list[len].start = start;
 302         list[len].order = order;
 303         eni_dev->free_len = len+1;
 304         /*dump_mem(eni_dev);*/
 305 }
 306
 307
 308 /*----------------------------------- RX ------------------------------------*/
 309
 310
 311 #define ENI_VCC_NOS ((struct atm_vcc *) 1)
 312
 313
 314 static void rx_ident_err(struct atm_vcc *vcc)
 315 {
 316         struct atm_dev *dev;
 317         struct eni_dev *eni_dev;
 318         struct eni_vcc *eni_vcc;
 319
 320         dev = vcc->dev;
 321         eni_dev = ENI_DEV(dev);
 322         /* immediately halt adapter */
 323         eni_out(eni_in(MID_MC_S) &
 324             ~(MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE),MID_MC_S);
 325         /* dump useful information */
 326         eni_vcc = ENI_VCC(vcc);
 327         printk(KERN_ALERT DEV_LABEL "(itf %d): driver error - RX ident "
 328             "mismatch\n",dev->number);
 329         printk(KERN_ALERT "  VCI %d, rxing %d, words %ld\n",vcc->vci,
 330             eni_vcc->rxing,eni_vcc->words);
 331         printk(KERN_ALERT "  host descr 0x%lx, rx pos 0x%lx, descr value "
 332             "0x%x\n",eni_vcc->descr,eni_vcc->rx_pos,
 333             (unsigned) readl(eni_vcc->recv+eni_vcc->descr*4));
 334         printk(KERN_ALERT "  last %p, servicing %d\n",eni_vcc->last,
 335             eni_vcc->servicing);
 336         EVENT("---dump ends here---\n",0,0);
 337         printk(KERN_NOTICE "---recent events---\n");
 338         event_dump();
 339         ENI_DEV(dev)->fast = NULL; /* really stop it */
 340         ENI_DEV(dev)->slow = NULL;
 341         skb_queue_head_init(&ENI_DEV(dev)->rx_queue);
 342 }
 343
 344
 345 static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
 346     unsigned long skip,unsigned long size,unsigned long eff)
 347 {
 348         struct eni_dev *eni_dev;
 349         struct eni_vcc *eni_vcc;
 350         u32 dma_rd,dma_wr;
 351         u32 dma[RX_DMA_BUF*2];
 352         dma_addr_t paddr;
 353         unsigned long here;
 354         int i,j;
 355
 356         eni_dev = ENI_DEV(vcc->dev);
 357         eni_vcc = ENI_VCC(vcc);
 358         paddr = 0; /* GCC, shut up */
 359         if (skb) {
 360                 paddr = pci_map_single(eni_dev->pci_dev,skb->data,skb->len,
 361                     PCI_DMA_FROMDEVICE);
 362                 ENI_PRV_PADDR(skb) = paddr;
 363                 if (paddr & 3)
 364                         printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %d has "
 365                             "mis-aligned RX data (0x%lx)\n",vcc->dev->number,
 366                             vcc->vci,(unsigned long) paddr);
 367                 ENI_PRV_SIZE(skb) = size+skip;
 368                     /* PDU plus descriptor */
 369                 ATM_SKB(skb)->vcc = vcc;
 370         }
 371         j = 0;
 372         if ((eff && skip) || 1) { /* @@@ actually, skip is always == 1 ... */
 373                 here = (eni_vcc->descr+skip) & (eni_vcc->words-1);
 374                 dma[j++] = (here << MID_DMA_COUNT_SHIFT) | (vcc->vci
 375                     << MID_DMA_VCI_SHIFT) | MID_DT_JK;
 376                 j++;
 377         }
 378         here = (eni_vcc->descr+size+skip) & (eni_vcc->words-1);
 379         if (!eff) size += skip;
 380         else {
 381                 unsigned long words;
 382
 383                 if (!size) {
 384                         DPRINTK("strange things happen ...\n");
 385                         EVENT("strange things happen ... (skip=%ld,eff=%ld)\n",
 386                             size,eff);
 387                 }
 388                 words = eff;
 389                 if (paddr & 15) {
 390                         unsigned long init;
 391
 392                         init = 4-((paddr & 15) >> 2);
 393                         if (init > words) init = words;
 394                         dma[j++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
 395                             (vcc->vci << MID_DMA_VCI_SHIFT);
 396                         dma[j++] = paddr;
 397                         paddr += init << 2;
 398                         words -= init;
 399                 }
 400 #ifdef CONFIG_ATM_ENI_BURST_RX_16W /* may work with some PCI chipsets ... */
 401                 if (words & ~15) {
 402                         dma[j++] = MID_DT_16W | ((words >> 4) <<
 403                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 404                             MID_DMA_VCI_SHIFT);
 405                         dma[j++] = paddr;
 406                         paddr += (words & ~15) << 2;
 407                         words &= 15;
 408                 }
 409 #endif
 410 #ifdef CONFIG_ATM_ENI_BURST_RX_8W  /* works only with *some* PCI chipsets ... */
 411                 if (words & ~7) {
 412                         dma[j++] = MID_DT_8W | ((words >> 3) <<
 413                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 414                             MID_DMA_VCI_SHIFT);
 415                         dma[j++] = paddr;
 416                         paddr += (words & ~7) << 2;
 417                         words &= 7;
 418                 }
 419 #endif
 420 #ifdef CONFIG_ATM_ENI_BURST_RX_4W /* recommended */
 421                 if (words & ~3) {
 422                         dma[j++] = MID_DT_4W | ((words >> 2) <<
 423                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 424                             MID_DMA_VCI_SHIFT);
 425                         dma[j++] = paddr;
 426                         paddr += (words & ~3) << 2;
 427                         words &= 3;
 428                 }
 429 #endif
 430 #ifdef CONFIG_ATM_ENI_BURST_RX_2W /* probably useless if RX_4W, RX_8W, ... */
 431                 if (words & ~1) {
 432                         dma[j++] = MID_DT_2W | ((words >> 1) <<
 433                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 434                             MID_DMA_VCI_SHIFT);
 435                         dma[j++] = paddr;
 436                         paddr += (words & ~1) << 2;
 437                         words &= 1;
 438                 }
 439 #endif
 440                 if (words) {
 441                         dma[j++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT)
 442                             | (vcc->vci << MID_DMA_VCI_SHIFT);
 443                         dma[j++] = paddr;
 444                 }
 445         }
 446         if (size != eff) {
 447                 dma[j++] = (here << MID_DMA_COUNT_SHIFT) |
 448                     (vcc->vci << MID_DMA_VCI_SHIFT) | MID_DT_JK;
 449                 j++;
 450         }
 451         if (!j || j > 2*RX_DMA_BUF) {
 452                 printk(KERN_CRIT DEV_LABEL "!j or j too big!!!\n");
 453                 goto trouble;
 454         }
 455         dma[j-2] |= MID_DMA_END;
 456         j = j >> 1;
 457         dma_wr = eni_in(MID_DMA_WR_RX);
 458         dma_rd = eni_in(MID_DMA_RD_RX);
 459         /*
 460          * Can I move the dma_wr pointer by 2j+1 positions without overwriting
 461          * data that hasn't been read (position of dma_rd) yet ?
 462          */
 463         if (!NEPMOK(dma_wr,j+j+1,dma_rd,NR_DMA_RX)) { /* @@@ +1 is ugly */
 464                 printk(KERN_WARNING DEV_LABEL "(itf %d): RX DMA full\n",
 465                     vcc->dev->number);
 466                 goto trouble;
 467         }
 468         for (i = 0; i < j; i++) {
 469                 writel(dma[i*2],eni_dev->rx_dma+dma_wr*8);
 470                 writel(dma[i*2+1],eni_dev->rx_dma+dma_wr*8+4);
 471                 dma_wr = (dma_wr+1) & (NR_DMA_RX-1);
 472         }
 473         if (skb) {
 474                 ENI_PRV_POS(skb) = eni_vcc->descr+size+1;
 475                 skb_queue_tail(&eni_dev->rx_queue,skb);
 476                 eni_vcc->last = skb;
 477 rx_enqueued++;
 478         }
 479         eni_vcc->descr = here;
 480         eni_out(dma_wr,MID_DMA_WR_RX);
 481         return 0;
 482
 483 trouble:
 484         if (paddr)
 485                 pci_unmap_single(eni_dev->pci_dev,paddr,skb->len,
 486                     PCI_DMA_FROMDEVICE);
 487         if (skb) dev_kfree_skb_irq(skb);
 488         return -1;
 489 }
 490
 491
 492 static void discard(struct atm_vcc *vcc,unsigned long size)
 493 {
 494         struct eni_vcc *eni_vcc;
 495
 496         eni_vcc = ENI_VCC(vcc);
 497         EVENT("discard (size=%ld)\n",size,0);
 498         while (do_rx_dma(vcc,NULL,1,size,0)) EVENT("BUSY LOOP",0,0);
 499             /* could do a full fallback, but that might be more expensive */
 500         if (eni_vcc->rxing) ENI_PRV_POS(eni_vcc->last) += size+1;
 501         else eni_vcc->rx_pos = (eni_vcc->rx_pos+size+1) & (eni_vcc->words-1);
 502 }
 503
 504
 505 /*
 506  * TODO: should check whether direct copies (without DMA setup, dequeuing on
 507  * interrupt, etc.) aren't much faster for AAL0
 508  */
 509
 510 static int rx_aal0(struct atm_vcc *vcc)
 511 {
 512         struct eni_vcc *eni_vcc;
 513         unsigned long descr;
 514         unsigned long length;
 515         struct sk_buff *skb;
 516
 517         DPRINTK(">rx_aal0\n");
 518         eni_vcc = ENI_VCC(vcc);
 519         descr = readl(eni_vcc->recv+eni_vcc->descr*4);
 520         if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
 521                 rx_ident_err(vcc);
 522                 return 1;
 523         }
 524         if (descr & MID_RED_T) {
 525                 DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
 526                     vcc->dev->number);
 527                 length = 0;
 528                 atomic_inc(&vcc->stats->rx_err);
 529         }
 530         else {
 531                 length = ATM_CELL_SIZE-1; /* no HEC */
 532         }
 533         skb = length ? atm_alloc_charge(vcc,length,GFP_ATOMIC) : NULL;
 534         if (!skb) {
 535                 discard(vcc,length >> 2);
 536                 return 0;
 537         }
 538         skb_put(skb,length);
 539         skb->tstamp = eni_vcc->timestamp;
 540         DPRINTK("got len %ld\n",length);
 541         if (do_rx_dma(vcc,skb,1,length >> 2,length >> 2)) return 1;
 542         eni_vcc->rxing++;
 543         return 0;
 544 }
 545
 546
 547 static int rx_aal5(struct atm_vcc *vcc)
 548 {
 549         struct eni_vcc *eni_vcc;
 550         unsigned long descr;
 551         unsigned long size,eff,length;
 552         struct sk_buff *skb;
 553
 554         EVENT("rx_aal5\n",0,0);
 555         DPRINTK(">rx_aal5\n");
 556         eni_vcc = ENI_VCC(vcc);
 557         descr = readl(eni_vcc->recv+eni_vcc->descr*4);
 558         if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
 559                 rx_ident_err(vcc);
 560                 return 1;
 561         }
 562         if (descr & (MID_RED_T | MID_RED_CRC_ERR)) {
 563                 if (descr & MID_RED_T) {
 564                         EVENT("empty cell (descr=0x%lx)\n",descr,0);
 565                         DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
 566                             vcc->dev->number);
 567                         size = 0;
 568                 }
 569                 else {
 570                         static unsigned long silence = 0;
 571
 572                         if (time_after(jiffies, silence) || silence == 0) {
 573                                 printk(KERN_WARNING DEV_LABEL "(itf %d): "
 574                                     "discarding PDU(s) with CRC error\n",
 575                                     vcc->dev->number);
 576                                 silence = (jiffies+2*HZ)|1;
 577                         }
 578                         size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
 579                         EVENT("CRC error (descr=0x%lx,size=%ld)\n",descr,
 580                             size);
 581                 }
 582                 eff = length = 0;
 583                 atomic_inc(&vcc->stats->rx_err);
 584         }
 585         else {
 586                 size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
 587                 DPRINTK("size=%ld\n",size);
 588                 length = readl(eni_vcc->recv+(((eni_vcc->descr+size-1) &
 589                     (eni_vcc->words-1)))*4) & 0xffff;
 590                                 /* -trailer(2)+header(1) */
 591                 if (length && length <= (size << 2)-8 && length <=
 592                   ATM_MAX_AAL5_PDU) eff = (length+3) >> 2;
 593                 else {                           /* ^ trailer length (8) */
 594                         EVENT("bad PDU (descr=0x08%lx,length=%ld)\n",descr,
 595                             length);
 596                         printk(KERN_ERR DEV_LABEL "(itf %d): bad AAL5 PDU "
 597                             "(VCI=%d,length=%ld,size=%ld (descr 0x%lx))\n",
 598                             vcc->dev->number,vcc->vci,length,size << 2,descr);
 599                         length = eff = 0;
 600                         atomic_inc(&vcc->stats->rx_err);
 601                 }
 602         }
 603         skb = eff ? atm_alloc_charge(vcc,eff << 2,GFP_ATOMIC) : NULL;
 604         if (!skb) {
 605                 discard(vcc,size);
 606                 return 0;
 607         }
 608         skb_put(skb,length);
 609         DPRINTK("got len %ld\n",length);
 610         if (do_rx_dma(vcc,skb,1,size,eff)) return 1;
 611         eni_vcc->rxing++;
 612         return 0;
 613 }
 614
 615
 616 static inline int rx_vcc(struct atm_vcc *vcc)
 617 {
 618         void __iomem *vci_dsc;
 619         unsigned long tmp;
 620         struct eni_vcc *eni_vcc;
 621
 622         eni_vcc = ENI_VCC(vcc);
 623         vci_dsc = ENI_DEV(vcc->dev)->vci+vcc->vci*16;
 624         EVENT("rx_vcc(1)\n",0,0);
 625         while (eni_vcc->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR) >>
 626             MID_VCI_DESCR_SHIFT)) {
 627                 EVENT("rx_vcc(2: host dsc=0x%lx, nic dsc=0x%lx)\n",
 628                     eni_vcc->descr,tmp);
 629                 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
 630                     (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
 631                     MID_VCI_DESCR_SHIFT));
 632                 if (ENI_VCC(vcc)->rx(vcc)) return 1;
 633         }
 634         /* clear IN_SERVICE flag */
 635         writel(readl(vci_dsc) & ~MID_VCI_IN_SERVICE,vci_dsc);
 636         /*
 637          * If new data has arrived between evaluating the while condition and
 638          * clearing IN_SERVICE, we wouldn't be notified until additional data
 639          * follows. So we have to loop again to be sure.
 640          */
 641         EVENT("rx_vcc(3)\n",0,0);
 642         while (ENI_VCC(vcc)->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR)
 643             >> MID_VCI_DESCR_SHIFT)) {
 644                 EVENT("rx_vcc(4: host dsc=0x%lx, nic dsc=0x%lx)\n",
 645                     eni_vcc->descr,tmp);
 646                 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
 647                     (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
 648                     MID_VCI_DESCR_SHIFT));
 649                 if (ENI_VCC(vcc)->rx(vcc)) return 1;
 650         }
 651         return 0;
 652 }
 653
 654
 655 static void poll_rx(struct atm_dev *dev)
 656 {
 657         struct eni_dev *eni_dev;
 658         struct atm_vcc *curr;
 659
 660         eni_dev = ENI_DEV(dev);
 661         while ((curr = eni_dev->fast)) {
 662                 EVENT("poll_rx.fast\n",0,0);
 663                 if (rx_vcc(curr)) return;
 664                 eni_dev->fast = ENI_VCC(curr)->next;
 665                 ENI_VCC(curr)->next = ENI_VCC_NOS;
 666                 barrier();
 667                 ENI_VCC(curr)->servicing--;
 668         }
 669         while ((curr = eni_dev->slow)) {
 670                 EVENT("poll_rx.slow\n",0,0);
 671                 if (rx_vcc(curr)) return;
 672                 eni_dev->slow = ENI_VCC(curr)->next;
 673                 ENI_VCC(curr)->next = ENI_VCC_NOS;
 674                 barrier();
 675                 ENI_VCC(curr)->servicing--;
 676         }
 677 }
 678
 679
 680 static void get_service(struct atm_dev *dev)
 681 {
 682         struct eni_dev *eni_dev;
 683         struct atm_vcc *vcc;
 684         unsigned long vci;
 685
 686         DPRINTK(">get_service\n");
 687         eni_dev = ENI_DEV(dev);
 688         while (eni_in(MID_SERV_WRITE) != eni_dev->serv_read) {
 689                 vci = readl(eni_dev->service+eni_dev->serv_read*4);
 690                 eni_dev->serv_read = (eni_dev->serv_read+1) & (NR_SERVICE-1);
 691                 vcc = eni_dev->rx_map[vci & 1023];
 692                 if (!vcc) {
 693                         printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %ld not "
 694                             "found\n",dev->number,vci);
 695                         continue; /* nasty but we try to go on anyway */
 696                         /* @@@ nope, doesn't work */
 697                 }
 698                 EVENT("getting from service\n",0,0);
 699                 if (ENI_VCC(vcc)->next != ENI_VCC_NOS) {
 700                         EVENT("double service\n",0,0);
 701                         DPRINTK("Grr, servicing VCC %ld twice\n",vci);
 702                         continue;
 703                 }
 704                 ENI_VCC(vcc)->timestamp = ktime_get_real();
 705                 ENI_VCC(vcc)->next = NULL;
 706                 if (vcc->qos.rxtp.traffic_class == ATM_CBR) {
 707                         if (eni_dev->fast)
 708                                 ENI_VCC(eni_dev->last_fast)->next = vcc;
 709                         else eni_dev->fast = vcc;
 710                         eni_dev->last_fast = vcc;
 711                 }
 712                 else {
 713                         if (eni_dev->slow)
 714                                 ENI_VCC(eni_dev->last_slow)->next = vcc;
 715                         else eni_dev->slow = vcc;
 716                         eni_dev->last_slow = vcc;
 717                 }
 718 putting++;
 719                 ENI_VCC(vcc)->servicing++;
 720         }
 721 }
 722
 723
 724 static void dequeue_rx(struct atm_dev *dev)
 725 {
 726         struct eni_dev *eni_dev;
 727         struct eni_vcc *eni_vcc;
 728         struct atm_vcc *vcc;
 729         struct sk_buff *skb;
 730         void __iomem *vci_dsc;
 731         int first;
 732
 733         eni_dev = ENI_DEV(dev);
 734         first = 1;
 735         while (1) {
 736                 skb = skb_dequeue(&eni_dev->rx_queue);
 737                 if (!skb) {
 738                         if (first) {
 739                                 DPRINTK(DEV_LABEL "(itf %d): RX but not "
 740                                     "rxing\n",dev->number);
 741                                 EVENT("nothing to dequeue\n",0,0);
 742                         }
 743                         break;
 744                 }
 745                 EVENT("dequeued (size=%ld,pos=0x%lx)\n",ENI_PRV_SIZE(skb),
 746                     ENI_PRV_POS(skb));
 747 rx_dequeued++;
 748                 vcc = ATM_SKB(skb)->vcc;
 749                 eni_vcc = ENI_VCC(vcc);
 750                 first = 0;
 751                 vci_dsc = eni_dev->vci+vcc->vci*16;
 752                 if (!EEPMOK(eni_vcc->rx_pos,ENI_PRV_SIZE(skb),
 753                     (readl(vci_dsc+4) & MID_VCI_READ) >> MID_VCI_READ_SHIFT,
 754                     eni_vcc->words)) {
 755                         EVENT("requeuing\n",0,0);
 756                         skb_queue_head(&eni_dev->rx_queue,skb);
 757                         break;
 758                 }
 759                 eni_vcc->rxing--;
 760                 eni_vcc->rx_pos = ENI_PRV_POS(skb) & (eni_vcc->words-1);
 761                 pci_unmap_single(eni_dev->pci_dev,ENI_PRV_PADDR(skb),skb->len,
 762                     PCI_DMA_TODEVICE);
 763                 if (!skb->len) dev_kfree_skb_irq(skb);
 764                 else {
 765                         EVENT("pushing (len=%ld)\n",skb->len,0);
 766                         if (vcc->qos.aal == ATM_AAL0)
 767                                 *(unsigned long *) skb->data =
 768                                     ntohl(*(unsigned long *) skb->data);
 769                         memset(skb->cb,0,sizeof(struct eni_skb_prv));
 770                         vcc->push(vcc,skb);
 771                         pushed++;
 772                 }
 773                 atomic_inc(&vcc->stats->rx);
 774         }
 775         wake_up(&eni_dev->rx_wait);
 776 }
 777
 778
 779 static int open_rx_first(struct atm_vcc *vcc)
 780 {
 781         struct eni_dev *eni_dev;
 782         struct eni_vcc *eni_vcc;
 783         unsigned long size;
 784
 785         DPRINTK("open_rx_first\n");
 786         eni_dev = ENI_DEV(vcc->dev);
 787         eni_vcc = ENI_VCC(vcc);
 788         eni_vcc->rx = NULL;
 789         if (vcc->qos.rxtp.traffic_class == ATM_NONE) return 0;
 790         size = vcc->qos.rxtp.max_sdu*eni_dev->rx_mult/100;
 791         if (size > MID_MAX_BUF_SIZE && vcc->qos.rxtp.max_sdu <=
 792             MID_MAX_BUF_SIZE)
 793                 size = MID_MAX_BUF_SIZE;
 794         eni_vcc->recv = eni_alloc_mem(eni_dev,&size);
 795         DPRINTK("rx at 0x%lx\n",eni_vcc->recv);
 796         eni_vcc->words = size >> 2;
 797         if (!eni_vcc->recv) return -ENOBUFS;
 798         eni_vcc->rx = vcc->qos.aal == ATM_AAL5 ? rx_aal5 : rx_aal0;
 799         eni_vcc->descr = 0;
 800         eni_vcc->rx_pos = 0;
 801         eni_vcc->rxing = 0;
 802         eni_vcc->servicing = 0;
 803         eni_vcc->next = ENI_VCC_NOS;
 804         return 0;
 805 }
 806
 807
 808 static int open_rx_second(struct atm_vcc *vcc)
 809 {
 810         void __iomem *here;
 811         struct eni_dev *eni_dev;
 812         struct eni_vcc *eni_vcc;
 813         unsigned long size;
 814         int order;
 815
 816         DPRINTK("open_rx_second\n");
 817         eni_dev = ENI_DEV(vcc->dev);
 818         eni_vcc = ENI_VCC(vcc);
 819         if (!eni_vcc->rx) return 0;
 820         /* set up VCI descriptor */
 821         here = eni_dev->vci+vcc->vci*16;
 822         DPRINTK("loc 0x%x\n",(unsigned) (eni_vcc->recv-eni_dev->ram)/4);
 823         size = eni_vcc->words >> 8;
 824         for (order = -1; size; order++) size >>= 1;
 825         writel(0,here+4); /* descr, read = 0 */
 826         writel(0,here+8); /* write, state, count = 0 */
 827         if (eni_dev->rx_map[vcc->vci])
 828                 printk(KERN_CRIT DEV_LABEL "(itf %d): BUG - VCI %d already "
 829                     "in use\n",vcc->dev->number,vcc->vci);
 830         eni_dev->rx_map[vcc->vci] = vcc; /* now it counts */
 831         writel(((vcc->qos.aal != ATM_AAL5 ? MID_MODE_RAW : MID_MODE_AAL5) <<
 832             MID_VCI_MODE_SHIFT) | MID_VCI_PTI_MODE |
 833             (((eni_vcc->recv-eni_dev->ram) >> (MID_LOC_SKIP+2)) <<
 834             MID_VCI_LOCATION_SHIFT) | (order << MID_VCI_SIZE_SHIFT),here);
 835         return 0;
 836 }
 837
 838
 839 static void close_rx(struct atm_vcc *vcc)
 840 {
 841         DECLARE_WAITQUEUE(wait,current);
 842         void __iomem *here;
 843         struct eni_dev *eni_dev;
 844         struct eni_vcc *eni_vcc;
 845
 846         eni_vcc = ENI_VCC(vcc);
 847         if (!eni_vcc->rx) return;
 848         eni_dev = ENI_DEV(vcc->dev);
 849         if (vcc->vpi != ATM_VPI_UNSPEC && vcc->vci != ATM_VCI_UNSPEC) {
 850                 here = eni_dev->vci+vcc->vci*16;
 851                 /* block receiver */
 852                 writel((readl(here) & ~MID_VCI_MODE) | (MID_MODE_TRASH <<
 853                     MID_VCI_MODE_SHIFT),here);
 854                 /* wait for receiver to become idle */
 855                 udelay(27);
 856                 /* discard pending cell */
 857                 writel(readl(here) & ~MID_VCI_IN_SERVICE,here);
 858                 /* don't accept any new ones */
 859                 eni_dev->rx_map[vcc->vci] = NULL;
 860                 /* wait for RX queue to drain */
 861                 DPRINTK("eni_close: waiting for RX ...\n");
 862                 EVENT("RX closing\n",0,0);
 863                 add_wait_queue(&eni_dev->rx_wait,&wait);
 864                 set_current_state(TASK_UNINTERRUPTIBLE);
 865                 barrier();
 866                 for (;;) {
 867                         /* transition service->rx: rxing++, servicing-- */
 868                         if (!eni_vcc->servicing) {
 869                                 barrier();
 870                                 if (!eni_vcc->rxing) break;
 871                         }
 872                         EVENT("drain PDUs (rx %ld, serv %ld)\n",eni_vcc->rxing,
 873                             eni_vcc->servicing);
 874                         printk(KERN_INFO "%d+%d RX left\n",eni_vcc->servicing,
 875                             eni_vcc->rxing);
 876                         schedule();
 877                         set_current_state(TASK_UNINTERRUPTIBLE);
 878                 }
 879                 for (;;) {
 880                         int at_end;
 881                         u32 tmp;
 882
 883                         tasklet_disable(&eni_dev->task);
 884                         tmp = readl(eni_dev->vci+vcc->vci*16+4) & MID_VCI_READ;
 885                         at_end = eni_vcc->rx_pos == tmp >> MID_VCI_READ_SHIFT;
 886                         tasklet_enable(&eni_dev->task);
 887                         if (at_end) break;
 888                         EVENT("drain discard (host 0x%lx, nic 0x%lx)\n",
 889                             eni_vcc->rx_pos,tmp);
 890                         printk(KERN_INFO "draining RX: host 0x%lx, nic 0x%x\n",
 891                             eni_vcc->rx_pos,tmp);
 892                         schedule();
 893                         set_current_state(TASK_UNINTERRUPTIBLE);
 894                 }
 895                 set_current_state(TASK_RUNNING);
 896                 remove_wait_queue(&eni_dev->rx_wait,&wait);
 897         }
 898         eni_free_mem(eni_dev,eni_vcc->recv,eni_vcc->words << 2);
 899         eni_vcc->rx = NULL;
 900 }
 901
 902
 903 static int start_rx(struct atm_dev *dev)
 904 {
 905         struct eni_dev *eni_dev;
 906
 907         eni_dev = ENI_DEV(dev);
 908         eni_dev->rx_map = (struct atm_vcc **) get_zeroed_page(GFP_KERNEL);
 909         if (!eni_dev->rx_map) {
 910                 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
 911                     dev->number);
 912                 free_page((unsigned long) eni_dev->free_list);
 913                 return -ENOMEM;
 914         }
 915         eni_dev->rx_mult = DEFAULT_RX_MULT;
 916         eni_dev->fast = eni_dev->last_fast = NULL;
 917         eni_dev->slow = eni_dev->last_slow = NULL;
 918         init_waitqueue_head(&eni_dev->rx_wait);
 919         skb_queue_head_init(&eni_dev->rx_queue);
 920         eni_dev->serv_read = eni_in(MID_SERV_WRITE);
 921         eni_out(0,MID_DMA_WR_RX);
 922         return 0;
 923 }
 924
 925
 926 /*----------------------------------- TX ------------------------------------*/
 927
 928
 929 enum enq_res { enq_ok,enq_next,enq_jam };
 930
 931
 932 static inline void put_dma(int chan,u32 *dma,int *j,dma_addr_t paddr,
 933     u32 size)
 934 {
 935         u32 init,words;
 936
 937         DPRINTK("put_dma: 0x%lx+0x%x\n",(unsigned long) paddr,size);
 938         EVENT("put_dma: 0x%lx+0x%lx\n",(unsigned long) paddr,size);
 939 #if 0 /* don't complain anymore */
 940         if (paddr & 3)
 941                 printk(KERN_ERR "put_dma: unaligned addr (0x%lx)\n",paddr);
 942         if (size & 3)
 943                 printk(KERN_ERR "put_dma: unaligned size (0x%lx)\n",size);
 944 #endif
 945         if (paddr & 3) {
 946                 init = 4-(paddr & 3);
 947                 if (init > size || size < 7) init = size;
 948                 DPRINTK("put_dma: %lx DMA: %d/%d bytes\n",
 949                     (unsigned long) paddr,init,size);
 950                 dma[(*j)++] = MID_DT_BYTE | (init << MID_DMA_COUNT_SHIFT) |
 951                     (chan << MID_DMA_CHAN_SHIFT);
 952                 dma[(*j)++] = paddr;
 953                 paddr += init;
 954                 size -= init;
 955         }
 956         words = size >> 2;
 957         size &= 3;
 958         if (words && (paddr & 31)) {
 959                 init = 8-((paddr & 31) >> 2);
 960                 if (init > words) init = words;
 961                 DPRINTK("put_dma: %lx DMA: %d/%d words\n",
 962                     (unsigned long) paddr,init,words);
 963                 dma[(*j)++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
 964                     (chan << MID_DMA_CHAN_SHIFT);
 965                 dma[(*j)++] = paddr;
 966                 paddr += init << 2;
 967                 words -= init;
 968         }
 969 #ifdef CONFIG_ATM_ENI_BURST_TX_16W /* may work with some PCI chipsets ... */
 970         if (words & ~15) {
 971                 DPRINTK("put_dma: %lx DMA: %d*16/%d words\n",
 972                     (unsigned long) paddr,words >> 4,words);
 973                 dma[(*j)++] = MID_DT_16W | ((words >> 4) << MID_DMA_COUNT_SHIFT)
 974                     | (chan << MID_DMA_CHAN_SHIFT);
 975                 dma[(*j)++] = paddr;
 976                 paddr += (words & ~15) << 2;
 977                 words &= 15;
 978         }
 979 #endif
 980 #ifdef CONFIG_ATM_ENI_BURST_TX_8W /* recommended */
 981         if (words & ~7) {
 982                 DPRINTK("put_dma: %lx DMA: %d*8/%d words\n",
 983                     (unsigned long) paddr,words >> 3,words);
 984                 dma[(*j)++] = MID_DT_8W | ((words >> 3) << MID_DMA_COUNT_SHIFT)
 985                     | (chan << MID_DMA_CHAN_SHIFT);
 986                 dma[(*j)++] = paddr;
 987                 paddr += (words & ~7) << 2;
 988                 words &= 7;
 989         }
 990 #endif
 991 #ifdef CONFIG_ATM_ENI_BURST_TX_4W /* probably useless if TX_8W or TX_16W */
 992         if (words & ~3) {
 993                 DPRINTK("put_dma: %lx DMA: %d*4/%d words\n",
 994                     (unsigned long) paddr,words >> 2,words);
 995                 dma[(*j)++] = MID_DT_4W | ((words >> 2) << MID_DMA_COUNT_SHIFT)
 996                     | (chan << MID_DMA_CHAN_SHIFT);
 997                 dma[(*j)++] = paddr;
 998                 paddr += (words & ~3) << 2;
 999                 words &= 3;
1000         }
1001 #endif
1002 #ifdef CONFIG_ATM_ENI_BURST_TX_2W /* probably useless if TX_4W, TX_8W, ... */
1003         if (words & ~1) {
1004                 DPRINTK("put_dma: %lx DMA: %d*2/%d words\n",
1005                     (unsigned long) paddr,words >> 1,words);
1006                 dma[(*j)++] = MID_DT_2W | ((words >> 1) << MID_DMA_COUNT_SHIFT)
1007                     | (chan << MID_DMA_CHAN_SHIFT);
1008                 dma[(*j)++] = paddr;
1009                 paddr += (words & ~1) << 2;
1010                 words &= 1;
1011         }
1012 #endif
1013         if (words) {
1014                 DPRINTK("put_dma: %lx DMA: %d words\n",(unsigned long) paddr,
1015                     words);
1016                 dma[(*j)++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT) |
1017                     (chan << MID_DMA_CHAN_SHIFT);
1018                 dma[(*j)++] = paddr;
1019                 paddr += words << 2;
1020         }
1021         if (size) {
1022                 DPRINTK("put_dma: %lx DMA: %d bytes\n",(unsigned long) paddr,
1023                     size);
1024                 dma[(*j)++] = MID_DT_BYTE | (size << MID_DMA_COUNT_SHIFT) |
1025                     (chan << MID_DMA_CHAN_SHIFT);
1026                 dma[(*j)++] = paddr;
1027         }
1028 }
1029
1030
1031 static enum enq_res do_tx(struct sk_buff *skb)
1032 {
1033         struct atm_vcc *vcc;
1034         struct eni_dev *eni_dev;
1035         struct eni_vcc *eni_vcc;
1036         struct eni_tx *tx;
1037         dma_addr_t paddr;
1038         u32 dma_rd,dma_wr;
1039         u32 size; /* in words */
1040         int aal5,dma_size,i,j;
1041
1042         DPRINTK(">do_tx\n");
1043         NULLCHECK(skb);
1044         EVENT("do_tx: skb=0x%lx, %ld bytes\n",(unsigned long) skb,skb->len);
1045         vcc = ATM_SKB(skb)->vcc;
1046         NULLCHECK(vcc);
1047         eni_dev = ENI_DEV(vcc->dev);
1048         NULLCHECK(eni_dev);
1049         eni_vcc = ENI_VCC(vcc);
1050         tx = eni_vcc->tx;
1051         NULLCHECK(tx);
1052 #if 0 /* Enable this for testing with the "align" program */
1053         {
1054                 unsigned int hack = *((char *) skb->data)-'0';
1055
1056                 if (hack < 8) {
1057                         skb->data += hack;
1058                         skb->len -= hack;
1059                 }
1060         }
1061 #endif
1062 #if 0 /* should work now */
1063         if ((unsigned long) skb->data & 3)
1064                 printk(KERN_ERR DEV_LABEL "(itf %d): VCI %d has mis-aligned "
1065                     "TX data\n",vcc->dev->number,vcc->vci);
1066 #endif
1067         /*
1068          * Potential future IP speedup: make hard_header big enough to put
1069          * segmentation descriptor directly into PDU. Saves: 4 slave writes,
1070          * 1 DMA xfer & 2 DMA'ed bytes (protocol layering is for wimps :-)
1071          */
1072
1073         aal5 = vcc->qos.aal == ATM_AAL5;
1074         /* check space in buffer */
1075         if (!aal5)
1076                 size = (ATM_CELL_PAYLOAD >> 2)+TX_DESCR_SIZE;
1077                         /* cell without HEC plus segmentation header (includes
1078                            four-byte cell header) */
1079         else {
1080                 size = skb->len+4*AAL5_TRAILER+ATM_CELL_PAYLOAD-1;
1081                         /* add AAL5 trailer */
1082                 size = ((size-(size % ATM_CELL_PAYLOAD)) >> 2)+TX_DESCR_SIZE;
1083                                                 /* add segmentation header */
1084         }
1085         /*
1086          * Can I move tx_pos by size bytes without getting closer than TX_GAP
1087          * to the read pointer ? TX_GAP means to leave some space for what
1088          * the manual calls "too close".
1089          */
1090         if (!NEPMOK(tx->tx_pos,size+TX_GAP,
1091             eni_in(MID_TX_RDPTR(tx->index)),tx->words)) {
1092                 DPRINTK(DEV_LABEL "(itf %d): TX full (size %d)\n",
1093                     vcc->dev->number,size);
1094                 return enq_next;
1095         }
1096         /* check DMA */
1097         dma_wr = eni_in(MID_DMA_WR_TX);
1098         dma_rd = eni_in(MID_DMA_RD_TX);
1099         dma_size = 3; /* JK for descriptor and final fill, plus final size
1100                          mis-alignment fix */
1101 DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
1102         if (!skb_shinfo(skb)->nr_frags) dma_size += 5;
1103         else dma_size += 5*(skb_shinfo(skb)->nr_frags+1);
1104         if (dma_size > TX_DMA_BUF) {
1105                 printk(KERN_CRIT DEV_LABEL "(itf %d): needs %d DMA entries "
1106                     "(got only %d)\n",vcc->dev->number,dma_size,TX_DMA_BUF);
1107         }
1108         DPRINTK("dma_wr is %d, tx_pos is %ld\n",dma_wr,tx->tx_pos);
1109         if (dma_wr != dma_rd && ((dma_rd+NR_DMA_TX-dma_wr) & (NR_DMA_TX-1)) <
1110              dma_size) {
1111                 printk(KERN_WARNING DEV_LABEL "(itf %d): TX DMA full\n",
1112                     vcc->dev->number);
1113                 return enq_jam;
1114         }
1115         paddr = pci_map_single(eni_dev->pci_dev,skb->data,skb->len,
1116             PCI_DMA_TODEVICE);
1117         ENI_PRV_PADDR(skb) = paddr;
1118         /* prepare DMA queue entries */
1119         j = 0;
1120         eni_dev->dma[j++] = (((tx->tx_pos+TX_DESCR_SIZE) & (tx->words-1)) <<
1121              MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
1122              MID_DT_JK;
1123         j++;
1124         if (!skb_shinfo(skb)->nr_frags)
1125                 if (aal5) put_dma(tx->index,eni_dev->dma,&j,paddr,skb->len);
1126                 else put_dma(tx->index,eni_dev->dma,&j,paddr+4,skb->len-4);
1127         else {
1128 DPRINTK("doing direct send\n"); /* @@@ well, this doesn't work anyway */
1129                 for (i = -1; i < skb_shinfo(skb)->nr_frags; i++)
1130                         if (i == -1)
1131                                 put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
1132                                     skb->data,
1133                                     skb->len - skb->data_len);
1134                         else
1135                                 put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
1136                                     skb_shinfo(skb)->frags[i].page + skb_shinfo(skb)->frags[i].page_offset,
1137                                     skb_shinfo(skb)->frags[i].size);
1138         }
1139         if (skb->len & 3)
1140                 put_dma(tx->index,eni_dev->dma,&j,zeroes,4-(skb->len & 3));
1141         /* JK for AAL5 trailer - AAL0 doesn't need it, but who cares ... */
1142         eni_dev->dma[j++] = (((tx->tx_pos+size) & (tx->words-1)) <<
1143              MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
1144              MID_DMA_END | MID_DT_JK;
1145         j++;
1146         DPRINTK("DMA at end: %d\n",j);
1147         /* store frame */
1148         writel((MID_SEG_TX_ID << MID_SEG_ID_SHIFT) |
1149             (aal5 ? MID_SEG_AAL5 : 0) | (tx->prescaler << MID_SEG_PR_SHIFT) |
1150             (tx->resolution << MID_SEG_RATE_SHIFT) |
1151             (size/(ATM_CELL_PAYLOAD/4)),tx->send+tx->tx_pos*4);
1152 /*printk("dsc = 0x%08lx\n",(unsigned long) readl(tx->send+tx->tx_pos*4));*/
1153         writel((vcc->vci << MID_SEG_VCI_SHIFT) |
1154             (aal5 ? 0 : (skb->data[3] & 0xf)) |
1155             (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? MID_SEG_CLP : 0),
1156             tx->send+((tx->tx_pos+1) & (tx->words-1))*4);
1157         DPRINTK("size: %d, len:%d\n",size,skb->len);
1158         if (aal5)
1159                 writel(skb->len,tx->send+
1160                     ((tx->tx_pos+size-AAL5_TRAILER) & (tx->words-1))*4);
1161         j = j >> 1;
1162         for (i = 0; i < j; i++) {
1163                 writel(eni_dev->dma[i*2],eni_dev->tx_dma+dma_wr*8);
1164                 writel(eni_dev->dma[i*2+1],eni_dev->tx_dma+dma_wr*8+4);
1165                 dma_wr = (dma_wr+1) & (NR_DMA_TX-1);
1166         }
1167         ENI_PRV_POS(skb) = tx->tx_pos;
1168         ENI_PRV_SIZE(skb) = size;
1169         ENI_VCC(vcc)->txing += size;
1170         tx->tx_pos = (tx->tx_pos+size) & (tx->words-1);
1171         DPRINTK("dma_wr set to %d, tx_pos is now %ld\n",dma_wr,tx->tx_pos);
1172         eni_out(dma_wr,MID_DMA_WR_TX);
1173         skb_queue_tail(&eni_dev->tx_queue,skb);
1174 queued++;
1175         return enq_ok;
1176 }
1177
1178
1179 static void poll_tx(struct atm_dev *dev)
1180 {
1181         struct eni_tx *tx;
1182         struct sk_buff *skb;
1183         enum enq_res res;
1184         int i;
1185
1186         DPRINTK(">poll_tx\n");
1187         for (i = NR_CHAN-1; i >= 0; i--) {
1188                 tx = &ENI_DEV(dev)->tx[i];
1189                 if (tx->send)
1190                         while ((skb = skb_dequeue(&tx->backlog))) {
1191                                 res = do_tx(skb);
1192                                 if (res == enq_ok) continue;
1193                                 DPRINTK("re-queuing TX PDU\n");
1194                                 skb_queue_head(&tx->backlog,skb);
1195 requeued++;
1196                                 if (res == enq_jam) return;
1197                                 break;
1198                         }
1199         }
1200 }
1201
1202
1203 static void dequeue_tx(struct atm_dev *dev)
1204 {
1205         struct eni_dev *eni_dev;
1206         struct atm_vcc *vcc;
1207         struct sk_buff *skb;
1208         struct eni_tx *tx;
1209
1210         NULLCHECK(dev);
1211         eni_dev = ENI_DEV(dev);
1212         NULLCHECK(eni_dev);
1213         while ((skb = skb_dequeue(&eni_dev->tx_queue))) {
1214                 vcc = ATM_SKB(skb)->vcc;
1215                 NULLCHECK(vcc);
1216                 tx = ENI_VCC(vcc)->tx;
1217                 NULLCHECK(ENI_VCC(vcc)->tx);
1218                 DPRINTK("dequeue_tx: next 0x%lx curr 0x%x\n",ENI_PRV_POS(skb),
1219                     (unsigned) eni_in(MID_TX_DESCRSTART(tx->index)));
1220                 if (ENI_VCC(vcc)->txing < tx->words && ENI_PRV_POS(skb) ==
1221                     eni_in(MID_TX_DESCRSTART(tx->index))) {
1222                         skb_queue_head(&eni_dev->tx_queue,skb);
1223                         break;
1224                 }
1225                 ENI_VCC(vcc)->txing -= ENI_PRV_SIZE(skb);
1226                 pci_unmap_single(eni_dev->pci_dev,ENI_PRV_PADDR(skb),skb->len,
1227                     PCI_DMA_TODEVICE);
1228                 if (vcc->pop) vcc->pop(vcc,skb);
1229                 else dev_kfree_skb_irq(skb);
1230                 atomic_inc(&vcc->stats->tx);
1231                 wake_up(&eni_dev->tx_wait);
1232 dma_complete++;
1233         }
1234 }
1235
1236
1237 static struct eni_tx *alloc_tx(struct eni_dev *eni_dev,int ubr)
1238 {
1239         int i;
1240
1241         for (i = !ubr; i < NR_CHAN; i++)
1242                 if (!eni_dev->tx[i].send) return eni_dev->tx+i;
1243         return NULL;
1244 }
1245
1246
1247 static int comp_tx(struct eni_dev *eni_dev,int *pcr,int reserved,int *pre,
1248     int *res,int unlimited)
1249 {
1250         static const int pre_div[] = { 4,16,128,2048 };
1251             /* 2^(((x+2)^2-(x+2))/2+1) */
1252
1253         if (unlimited) *pre = *res = 0;
1254         else {
1255                 if (*pcr > 0) {
1256                         int div;
1257
1258                         for (*pre = 0; *pre < 3; (*pre)++)
1259                                 if (TS_CLOCK/pre_div[*pre]/64 <= *pcr) break;
1260                         div = pre_div[*pre]**pcr;
1261                         DPRINTK("min div %d\n",div);
1262                         *res = TS_CLOCK/div-1;
1263                 }
1264                 else {
1265                         int div;
1266
1267                         if (!*pcr) *pcr = eni_dev->tx_bw+reserved;
1268                         for (*pre = 3; *pre >= 0; (*pre)--)
1269                                 if (TS_CLOCK/pre_div[*pre]/64 > -*pcr) break;
1270                         if (*pre < 3) (*pre)++; /* else fail later */
1271                         div = pre_div[*pre]*-*pcr;
1272                         DPRINTK("max div %d\n",div);
1273                         *res = DIV_ROUND_UP(TS_CLOCK, div)-1;
1274                 }
1275                 if (*res < 0) *res = 0;
1276                 if (*res > MID_SEG_MAX_RATE) *res = MID_SEG_MAX_RATE;
1277         }
1278         *pcr = TS_CLOCK/pre_div[*pre]/(*res+1);
1279         DPRINTK("out pcr: %d (%d:%d)\n",*pcr,*pre,*res);
1280         return 0;
1281 }
1282
1283
1284 static int reserve_or_set_tx(struct atm_vcc *vcc,struct atm_trafprm *txtp,
1285     int set_rsv,int set_shp)
1286 {
1287         struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1288         struct eni_vcc *eni_vcc = ENI_VCC(vcc);
1289         struct eni_tx *tx;
1290         unsigned long size;
1291         void __iomem *mem;
1292         int rate,ubr,unlimited,new_tx;
1293         int pre,res,order;
1294         int error;
1295
1296         rate = atm_pcr_goal(txtp);
1297         ubr = txtp->traffic_class == ATM_UBR;
1298         unlimited = ubr && (!rate || rate <= -ATM_OC3_PCR ||
1299             rate >= ATM_OC3_PCR);
1300         if (!unlimited) {
1301                 size = txtp->max_sdu*eni_dev->tx_mult/100;
1302                 if (size > MID_MAX_BUF_SIZE && txtp->max_sdu <=
1303                     MID_MAX_BUF_SIZE)
1304                         size = MID_MAX_BUF_SIZE;
1305         }
1306         else {
1307                 if (eni_dev->ubr) {
1308                         eni_vcc->tx = eni_dev->ubr;
1309                         txtp->pcr = ATM_OC3_PCR;
1310                         return 0;
1311                 }
1312                 size = UBR_BUFFER;
1313         }
1314         new_tx = !eni_vcc->tx;
1315         mem = NULL; /* for gcc */
1316         if (!new_tx) tx = eni_vcc->tx;
1317         else {
1318                 mem = eni_alloc_mem(eni_dev,&size);
1319                 if (!mem) return -ENOBUFS;
1320                 tx = alloc_tx(eni_dev,unlimited);
1321                 if (!tx) {
1322                         eni_free_mem(eni_dev,mem,size);
1323                         return -EBUSY;
1324                 }
1325                 DPRINTK("got chan %d\n",tx->index);
1326                 tx->reserved = tx->shaping = 0;
1327                 tx->send = mem;
1328                 tx->words = size >> 2;
1329                 skb_queue_head_init(&tx->backlog);
1330                 for (order = 0; size > (1 << (order+10)); order++);
1331                 eni_out((order << MID_SIZE_SHIFT) |
1332                     ((tx->send-eni_dev->ram) >> (MID_LOC_SKIP+2)),
1333                     MID_TX_PLACE(tx->index));
1334                 tx->tx_pos = eni_in(MID_TX_DESCRSTART(tx->index)) &
1335                     MID_DESCR_START;
1336         }
1337         error = comp_tx(eni_dev,&rate,tx->reserved,&pre,&res,unlimited);
1338         if (!error  && txtp->min_pcr > rate) error = -EINVAL;
1339         if (!error && txtp->max_pcr && txtp->max_pcr != ATM_MAX_PCR &&
1340             txtp->max_pcr < rate) error = -EINVAL;
1341         if (!error && !ubr && rate > eni_dev->tx_bw+tx->reserved)
1342                 error = -EINVAL;
1343         if (!error && set_rsv && !set_shp && rate < tx->shaping)
1344                 error = -EINVAL;
1345         if (!error && !set_rsv && rate > tx->reserved && !ubr)
1346                 error = -EINVAL;
1347         if (error) {
1348                 if (new_tx) {
1349                         tx->send = NULL;
1350                         eni_free_mem(eni_dev,mem,size);
1351                 }
1352                 return error;
1353         }
1354         txtp->pcr = rate;
1355         if (set_rsv && !ubr) {
1356                 eni_dev->tx_bw += tx->reserved;
1357                 tx->reserved = rate;
1358                 eni_dev->tx_bw -= rate;
1359         }
1360         if (set_shp || (unlimited && new_tx)) {
1361                 if (unlimited && new_tx) eni_dev->ubr = tx;
1362                 tx->prescaler = pre;
1363                 tx->resolution = res;
1364                 tx->shaping = rate;
1365         }
1366         if (set_shp) eni_vcc->tx = tx;
1367         DPRINTK("rsv %d shp %d\n",tx->reserved,tx->shaping);
1368         return 0;
1369 }
1370
1371
1372 static int open_tx_first(struct atm_vcc *vcc)
1373 {
1374         ENI_VCC(vcc)->tx = NULL;
1375         if (vcc->qos.txtp.traffic_class == ATM_NONE) return 0;
1376         ENI_VCC(vcc)->txing = 0;
1377         return reserve_or_set_tx(vcc,&vcc->qos.txtp,1,1);
1378 }
1379
1380
1381 static int open_tx_second(struct atm_vcc *vcc)
1382 {
1383         return 0; /* nothing to do */
1384 }
1385
1386
1387 static void close_tx(struct atm_vcc *vcc)
1388 {
1389         DECLARE_WAITQUEUE(wait,current);
1390         struct eni_dev *eni_dev;
1391         struct eni_vcc *eni_vcc;
1392
1393         eni_vcc = ENI_VCC(vcc);
1394         if (!eni_vcc->tx) return;
1395         eni_dev = ENI_DEV(vcc->dev);
1396         /* wait for TX queue to drain */
1397         DPRINTK("eni_close: waiting for TX ...\n");
1398         add_wait_queue(&eni_dev->tx_wait,&wait);
1399         set_current_state(TASK_UNINTERRUPTIBLE);
1400         for (;;) {
1401                 int txing;
1402
1403                 tasklet_disable(&eni_dev->task);
1404                 txing = skb_peek(&eni_vcc->tx->backlog) || eni_vcc->txing;
1405                 tasklet_enable(&eni_dev->task);
1406                 if (!txing) break;
1407                 DPRINTK("%d TX left\n",eni_vcc->txing);
1408                 schedule();
1409                 set_current_state(TASK_UNINTERRUPTIBLE);
1410         }
1411         set_current_state(TASK_RUNNING);
1412         remove_wait_queue(&eni_dev->tx_wait,&wait);
1413         if (eni_vcc->tx != eni_dev->ubr) {
1414                 /*
1415                  * Looping a few times in here is probably far cheaper than
1416                  * keeping track of TX completions all the time, so let's poll
1417                  * a bit ...
1418                  */
1419                 while (eni_in(MID_TX_RDPTR(eni_vcc->tx->index)) !=
1420                     eni_in(MID_TX_DESCRSTART(eni_vcc->tx->index)))
1421                         schedule();
1422                 eni_free_mem(eni_dev,eni_vcc->tx->send,eni_vcc->tx->words << 2);
1423                 eni_vcc->tx->send = NULL;
1424                 eni_dev->tx_bw += eni_vcc->tx->reserved;
1425         }
1426         eni_vcc->tx = NULL;
1427 }
1428
1429
1430 static int start_tx(struct atm_dev *dev)
1431 {
1432         struct eni_dev *eni_dev;
1433         int i;
1434
1435         eni_dev = ENI_DEV(dev);
1436         eni_dev->lost = 0;
1437         eni_dev->tx_bw = ATM_OC3_PCR;
1438         eni_dev->tx_mult = DEFAULT_TX_MULT;
1439         init_waitqueue_head(&eni_dev->tx_wait);
1440         eni_dev->ubr = NULL;
1441         skb_queue_head_init(&eni_dev->tx_queue);
1442         eni_out(0,MID_DMA_WR_TX);
1443         for (i = 0; i < NR_CHAN; i++) {
1444                 eni_dev->tx[i].send = NULL;
1445                 eni_dev->tx[i].index = i;
1446         }
1447         return 0;
1448 }
1449
1450
1451 /*--------------------------------- common ----------------------------------*/
1452
1453
1454 #if 0 /* may become useful again when tuning things */
1455
1456 static void foo(void)
1457 {
1458 printk(KERN_INFO
1459   "tx_complete=%d,dma_complete=%d,queued=%d,requeued=%d,sub=%d,\n"
1460   "backlogged=%d,rx_enqueued=%d,rx_dequeued=%d,putting=%d,pushed=%d\n",
1461   tx_complete,dma_complete,queued,requeued,submitted,backlogged,
1462   rx_enqueued,rx_dequeued,putting,pushed);
1463 if (eni_boards) printk(KERN_INFO "loss: %ld\n",ENI_DEV(eni_boards)->lost);
1464 }
1465
1466 #endif
1467
1468
1469 static void bug_int(struct atm_dev *dev,unsigned long reason)
1470 {
1471         struct eni_dev *eni_dev;
1472
1473         DPRINTK(">bug_int\n");
1474         eni_dev = ENI_DEV(dev);
1475         if (reason & MID_DMA_ERR_ACK)
1476                 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
1477                     "error\n",dev->number);
1478         if (reason & MID_TX_IDENT_MISM)
1479                 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - ident "
1480                     "mismatch\n",dev->number);
1481         if (reason & MID_TX_DMA_OVFL)
1482                 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
1483                     "overflow\n",dev->number);
1484         EVENT("---dump ends here---\n",0,0);
1485         printk(KERN_NOTICE "---recent events---\n");
1486         event_dump();
1487 }
1488
1489
1490 static irqreturn_t eni_int(int irq,void *dev_id)
1491 {
1492         struct atm_dev *dev;
1493         struct eni_dev *eni_dev;
1494         u32 reason;
1495
1496         DPRINTK(">eni_int\n");
1497         dev = dev_id;
1498         eni_dev = ENI_DEV(dev);
1499         reason = eni_in(MID_ISA);
1500         DPRINTK(DEV_LABEL ": int 0x%lx\n",(unsigned long) reason);
1501         /*
1502          * Must handle these two right now, because reading ISA doesn't clear
1503          * them, so they re-occur and we never make it to the tasklet. Since
1504          * they're rare, we don't mind the occasional invocation of eni_tasklet
1505          * with eni_dev->events == 0.
1506          */
1507         if (reason & MID_STAT_OVFL) {
1508                 EVENT("stat overflow\n",0,0);
1509                 eni_dev->lost += eni_in(MID_STAT) & MID_OVFL_TRASH;
1510         }
1511         if (reason & MID_SUNI_INT) {
1512                 EVENT("SUNI int\n",0,0);
1513                 dev->phy->interrupt(dev);
1514 #if 0
1515                 foo();
1516 #endif
1517         }
1518         spin_lock(&eni_dev->lock);
1519         eni_dev->events |= reason;
1520         spin_unlock(&eni_dev->lock);
1521         tasklet_schedule(&eni_dev->task);
1522         return IRQ_HANDLED;
1523 }
1524
1525
1526 static void eni_tasklet(unsigned long data)
1527 {
1528         struct atm_dev *dev = (struct atm_dev *) data;
1529         struct eni_dev *eni_dev = ENI_DEV(dev);
1530         unsigned long flags;
1531         u32 events;
1532
1533         DPRINTK("eni_tasklet (dev %p)\n",dev);
1534         spin_lock_irqsave(&eni_dev->lock,flags);
1535         events = xchg(&eni_dev->events,0);
1536         spin_unlock_irqrestore(&eni_dev->lock,flags);
1537         if (events & MID_RX_DMA_COMPLETE) {
1538                 EVENT("INT: RX DMA complete, starting dequeue_rx\n",0,0);
1539                 dequeue_rx(dev);
1540                 EVENT("dequeue_rx done, starting poll_rx\n",0,0);
1541                 poll_rx(dev);
1542                 EVENT("poll_rx done\n",0,0);
1543                 /* poll_tx ? */
1544         }
1545         if (events & MID_SERVICE) {
1546                 EVENT("INT: service, starting get_service\n",0,0);
1547                 get_service(dev);
1548                 EVENT("get_service done, starting poll_rx\n",0,0);
1549                 poll_rx(dev);
1550                 EVENT("poll_rx done\n",0,0);
1551         }
1552         if (events & MID_TX_DMA_COMPLETE) {
1553                 EVENT("INT: TX DMA COMPLETE\n",0,0);
1554                 dequeue_tx(dev);
1555         }
1556         if (events & MID_TX_COMPLETE) {
1557                 EVENT("INT: TX COMPLETE\n",0,0);
1558 tx_complete++;
1559                 wake_up(&eni_dev->tx_wait);
1560                 /* poll_rx ? */
1561         }
1562         if (events & (MID_DMA_ERR_ACK | MID_TX_IDENT_MISM | MID_TX_DMA_OVFL)) {
1563                 EVENT("bug interrupt\n",0,0);
1564                 bug_int(dev,events);
1565         }
1566         poll_tx(dev);
1567 }
1568
1569
1570 /*--------------------------------- entries ---------------------------------*/
1571
1572
1573 static const char *media_name[] __devinitdata = {
1574     "MMF", "SMF", "MMF", "03?", /*  0- 3 */
1575     "UTP", "05?", "06?", "07?", /*  4- 7 */
1576     "TAXI","09?", "10?", "11?", /*  8-11 */
1577     "12?", "13?", "14?", "15?", /* 12-15 */
1578     "MMF", "SMF", "18?", "19?", /* 16-19 */
1579     "UTP", "21?", "22?", "23?", /* 20-23 */
1580     "24?", "25?", "26?", "27?", /* 24-27 */
1581     "28?", "29?", "30?", "31?"  /* 28-31 */
1582 };
1583
1584
1585 #define SET_SEPROM \
1586   ({ if (!error && !pci_error) { \
1587     pci_error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,tonga); \
1588     udelay(10); /* 10 usecs */ \
1589   } })
1590 #define GET_SEPROM \
1591   ({ if (!error && !pci_error) { \
1592     pci_error = pci_read_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,&tonga); \
1593     udelay(10); /* 10 usecs */ \
1594   } })
1595
1596
1597 static int __devinit get_esi_asic(struct atm_dev *dev)
1598 {
1599         struct eni_dev *eni_dev;
1600         unsigned char tonga;
1601         int error,failed,pci_error;
1602         int address,i,j;
1603
1604         eni_dev = ENI_DEV(dev);
1605         error = pci_error = 0;
1606         tonga = SEPROM_MAGIC | SEPROM_DATA | SEPROM_CLK;
1607         SET_SEPROM;
1608         for (i = 0; i < ESI_LEN && !error && !pci_error; i++) {
1609                 /* start operation */
1610                 tonga |= SEPROM_DATA;
1611                 SET_SEPROM;
1612                 tonga |= SEPROM_CLK;
1613                 SET_SEPROM;
1614                 tonga &= ~SEPROM_DATA;
1615                 SET_SEPROM;
1616                 tonga &= ~SEPROM_CLK;
1617                 SET_SEPROM;
1618                 /* send address */
1619                 address = ((i+SEPROM_ESI_BASE) << 1)+1;
1620                 for (j = 7; j >= 0; j--) {
1621                         tonga = (address >> j) & 1 ? tonga | SEPROM_DATA :
1622                             tonga & ~SEPROM_DATA;
1623                         SET_SEPROM;
1624                         tonga |= SEPROM_CLK;
1625                         SET_SEPROM;
1626                         tonga &= ~SEPROM_CLK;
1627                         SET_SEPROM;
1628                 }
1629                 /* get ack */
1630                 tonga |= SEPROM_DATA;
1631                 SET_SEPROM;
1632                 tonga |= SEPROM_CLK;
1633                 SET_SEPROM;
1634                 GET_SEPROM;
1635                 failed = tonga & SEPROM_DATA;
1636                 tonga &= ~SEPROM_CLK;
1637                 SET_SEPROM;
1638                 tonga |= SEPROM_DATA;
1639                 SET_SEPROM;
1640                 if (failed) error = -EIO;
1641                 else {
1642                         dev->esi[i] = 0;
1643                         for (j = 7; j >= 0; j--) {
1644                                 dev->esi[i] <<= 1;
1645                                 tonga |= SEPROM_DATA;
1646                                 SET_SEPROM;
1647                                 tonga |= SEPROM_CLK;
1648                                 SET_SEPROM;
1649                                 GET_SEPROM;
1650                                 if (tonga & SEPROM_DATA) dev->esi[i] |= 1;
1651                                 tonga &= ~SEPROM_CLK;
1652                                 SET_SEPROM;
1653                                 tonga |= SEPROM_DATA;
1654                                 SET_SEPROM;
1655                         }
1656                         /* get ack */
1657                         tonga |= SEPROM_DATA;
1658                         SET_SEPROM;
1659                         tonga |= SEPROM_CLK;
1660                         SET_SEPROM;
1661                         GET_SEPROM;
1662                         if (!(tonga & SEPROM_DATA)) error = -EIO;
1663                         tonga &= ~SEPROM_CLK;
1664                         SET_SEPROM;
1665                         tonga |= SEPROM_DATA;
1666                         SET_SEPROM;
1667                 }
1668                 /* stop operation */
1669                 tonga &= ~SEPROM_DATA;
1670                 SET_SEPROM;
1671                 tonga |= SEPROM_CLK;
1672                 SET_SEPROM;
1673                 tonga |= SEPROM_DATA;
1674                 SET_SEPROM;
1675         }
1676         if (pci_error) {
1677                 printk(KERN_ERR DEV_LABEL "(itf %d): error reading ESI "
1678                     "(0x%02x)\n",dev->number,pci_error);
1679                 error = -EIO;
1680         }
1681         return error;
1682 }
1683
1684
1685 #undef SET_SEPROM
1686 #undef GET_SEPROM
1687
1688
1689 static int __devinit get_esi_fpga(struct atm_dev *dev, void __iomem *base)
1690 {
1691         void __iomem *mac_base;
1692         int i;
1693
1694         mac_base = base+EPROM_SIZE-sizeof(struct midway_eprom);
1695         for (i = 0; i < ESI_LEN; i++) dev->esi[i] = readb(mac_base+(i^3));
1696         return 0;
1697 }
1698
1699
1700 static int __devinit eni_do_init(struct atm_dev *dev)
1701 {
1702         struct midway_eprom __iomem *eprom;
1703         struct eni_dev *eni_dev;
1704         struct pci_dev *pci_dev;
1705         unsigned long real_base;
1706         void __iomem *base;
1707         int error,i,last;
1708
1709         DPRINTK(">eni_init\n");
1710         dev->ci_range.vpi_bits = 0;
1711         dev->ci_range.vci_bits = NR_VCI_LD;
1712         dev->link_rate = ATM_OC3_PCR;
1713         eni_dev = ENI_DEV(dev);
1714         pci_dev = eni_dev->pci_dev;
1715         real_base = pci_resource_start(pci_dev, 0);
1716         eni_dev->irq = pci_dev->irq;
1717         if ((error = pci_write_config_word(pci_dev,PCI_COMMAND,
1718             PCI_COMMAND_MEMORY |
1719             (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
1720                 printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory "
1721                     "(0x%02x)\n",dev->number,error);
1722                 return -EIO;
1723         }
1724         printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%lx,irq=%d,",
1725             dev->number,pci_dev->revision,real_base,eni_dev->irq);
1726         if (!(base = ioremap_nocache(real_base,MAP_MAX_SIZE))) {
1727                 printk("\n");
1728                 printk(KERN_ERR DEV_LABEL "(itf %d): can't set up page "
1729                     "mapping\n",dev->number);
1730                 return error;
1731         }
1732         eni_dev->base_diff = real_base - (unsigned long) base;
1733         /* id may not be present in ASIC Tonga boards - check this @@@ */
1734         if (!eni_dev->asic) {
1735                 eprom = (base+EPROM_SIZE-sizeof(struct midway_eprom));
1736                 if (readl(&eprom->magic) != ENI155_MAGIC) {
1737                         printk("\n");
1738                         printk(KERN_ERR KERN_ERR DEV_LABEL "(itf %d): bad "
1739                             "magic - expected 0x%x, got 0x%x\n",dev->number,
1740                             ENI155_MAGIC,(unsigned) readl(&eprom->magic));
1741                         error = -EINVAL;
1742                         goto unmap;
1743                 }
1744         }
1745         eni_dev->phy = base+PHY_BASE;
1746         eni_dev->reg = base+REG_BASE;
1747         eni_dev->ram = base+RAM_BASE;
1748         last = MAP_MAX_SIZE-RAM_BASE;
1749         for (i = last-RAM_INCREMENT; i >= 0; i -= RAM_INCREMENT) {
1750                 writel(0x55555555,eni_dev->ram+i);
1751                 if (readl(eni_dev->ram+i) != 0x55555555) last = i;
1752                 else {
1753                         writel(0xAAAAAAAA,eni_dev->ram+i);
1754                         if (readl(eni_dev->ram+i) != 0xAAAAAAAA) last = i;
1755                         else writel(i,eni_dev->ram+i);
1756                 }
1757         }
1758         for (i = 0; i < last; i += RAM_INCREMENT)
1759                 if (readl(eni_dev->ram+i) != i) break;
1760         eni_dev->mem = i;
1761         memset_io(eni_dev->ram,0,eni_dev->mem);
1762         /* TODO: should shrink allocation now */
1763         printk("mem=%dkB (",eni_dev->mem >> 10);
1764         /* TODO: check for non-SUNI, check for TAXI ? */
1765         if (!(eni_in(MID_RES_ID_MCON) & 0x200) != !eni_dev->asic) {
1766                 printk(")\n");
1767                 printk(KERN_ERR DEV_LABEL "(itf %d): ERROR - wrong id 0x%x\n",
1768                     dev->number,(unsigned) eni_in(MID_RES_ID_MCON));
1769                 error = -EINVAL;
1770                 goto unmap;
1771         }
1772         error = eni_dev->asic ? get_esi_asic(dev) : get_esi_fpga(dev,base);
1773         if (error)
1774                 goto unmap;
1775         for (i = 0; i < ESI_LEN; i++)
1776                 printk("%s%02X",i ? "-" : "",dev->esi[i]);
1777         printk(")\n");
1778         printk(KERN_NOTICE DEV_LABEL "(itf %d): %s,%s\n",dev->number,
1779             eni_in(MID_RES_ID_MCON) & 0x200 ? "ASIC" : "FPGA",
1780             media_name[eni_in(MID_RES_ID_MCON) & DAUGTHER_ID]);
1781
1782         error = suni_init(dev);
1783         if (error)
1784                 goto unmap;
1785 out:
1786         return error;
1787 unmap:
1788         iounmap(base);
1789         goto out;
1790 }
1791
1792
1793 static int __devinit eni_start(struct atm_dev *dev)
1794 {
1795         struct eni_dev *eni_dev;
1796
1797         void __iomem *buf;
1798         unsigned long buffer_mem;
1799         int error;
1800
1801         DPRINTK(">eni_start\n");
1802         eni_dev = ENI_DEV(dev);
1803         if (request_irq(eni_dev->irq,&eni_int,IRQF_SHARED,DEV_LABEL,dev)) {
1804                 printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",
1805                     dev->number,eni_dev->irq);
1806                 error = -EAGAIN;
1807                 goto out;
1808         }
1809         pci_set_master(eni_dev->pci_dev);
1810         if ((error = pci_write_config_word(eni_dev->pci_dev,PCI_COMMAND,
1811             PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
1812             (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
1813                 printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory+"
1814                     "master (0x%02x)\n",dev->number,error);
1815                 goto free_irq;
1816         }
1817         if ((error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,
1818             END_SWAP_DMA))) {
1819                 printk(KERN_ERR DEV_LABEL "(itf %d): can't set endian swap "
1820                     "(0x%02x)\n",dev->number,error);
1821                 goto free_irq;
1822         }
1823         /* determine addresses of internal tables */
1824         eni_dev->vci = eni_dev->ram;
1825         eni_dev->rx_dma = eni_dev->ram+NR_VCI*16;
1826         eni_dev->tx_dma = eni_dev->rx_dma+NR_DMA_RX*8;
1827         eni_dev->service = eni_dev->tx_dma+NR_DMA_TX*8;
1828         buf = eni_dev->service+NR_SERVICE*4;
1829         DPRINTK("vci 0x%lx,rx 0x%lx, tx 0x%lx,srv 0x%lx,buf 0x%lx\n",
1830              eni_dev->vci,eni_dev->rx_dma,eni_dev->tx_dma,
1831              eni_dev->service,buf);
1832         spin_lock_init(&eni_dev->lock);
1833         tasklet_init(&eni_dev->task,eni_tasklet,(unsigned long) dev);
1834         eni_dev->events = 0;
1835         /* initialize memory management */
1836         buffer_mem = eni_dev->mem - (buf - eni_dev->ram);
1837         eni_dev->free_list_size = buffer_mem/MID_MIN_BUF_SIZE/2;
1838         eni_dev->free_list = kmalloc(
1839             sizeof(struct eni_free)*(eni_dev->free_list_size+1),GFP_KERNEL);
1840         if (!eni_dev->free_list) {
1841                 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
1842                     dev->number);
1843                 error = -ENOMEM;
1844                 goto free_irq;
1845         }
1846         eni_dev->free_len = 0;
1847         eni_put_free(eni_dev,buf,buffer_mem);
1848         memset_io(eni_dev->vci,0,16*NR_VCI); /* clear VCI table */
1849         /*
1850          * byte_addr  free (k)
1851          * 0x00000000     512  VCI table
1852          * 0x00004000     496  RX DMA
1853          * 0x00005000     492  TX DMA
1854          * 0x00006000     488  service list
1855          * 0x00007000     484  buffers
1856          * 0x00080000       0  end (512kB)
1857          */
1858         eni_out(0xffffffff,MID_IE);
1859         error = start_tx(dev);
1860         if (error) goto free_list;
1861         error = start_rx(dev);
1862         if (error) goto free_list;
1863         error = dev->phy->start(dev);
1864         if (error) goto free_list;
1865         eni_out(eni_in(MID_MC_S) | (1 << MID_INT_SEL_SHIFT) |
1866             MID_TX_LOCK_MODE | MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE,
1867             MID_MC_S);
1868             /* Tonga uses SBus INTReq1 */
1869         (void) eni_in(MID_ISA); /* clear Midway interrupts */
1870         return 0;
1871
1872 free_list:
1873         kfree(eni_dev->free_list);
1874
1875 free_irq:
1876         free_irq(eni_dev->irq, eni_dev);
1877
1878 out:
1879         return error;
1880 }
1881
1882
1883 static void eni_close(struct atm_vcc *vcc)
1884 {
1885         DPRINTK(">eni_close\n");
1886         if (!ENI_VCC(vcc)) return;
1887         clear_bit(ATM_VF_READY,&vcc->flags);
1888         close_rx(vcc);
1889         close_tx(vcc);
1890         DPRINTK("eni_close: done waiting\n");
1891         /* deallocate memory */
1892         kfree(ENI_VCC(vcc));
1893         vcc->dev_data = NULL;
1894         clear_bit(ATM_VF_ADDR,&vcc->flags);
1895         /*foo();*/
1896 }
1897
1898
1899 static int eni_open(struct atm_vcc *vcc)
1900 {
1901         struct eni_dev *eni_dev;
1902         struct eni_vcc *eni_vcc;
1903         int error;
1904         short vpi = vcc->vpi;
1905         int vci = vcc->vci;
1906
1907         DPRINTK(">eni_open\n");
1908         EVENT("eni_open\n",0,0);
1909         if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
1910                 vcc->dev_data = NULL;
1911         eni_dev = ENI_DEV(vcc->dev);
1912         if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
1913                 set_bit(ATM_VF_ADDR,&vcc->flags);
1914         if (vcc->qos.aal != ATM_AAL0 && vcc->qos.aal != ATM_AAL5)
1915                 return -EINVAL;
1916         DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
1917             vcc->vci);
1918         if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
1919                 eni_vcc = kmalloc(sizeof(struct eni_vcc),GFP_KERNEL);
1920                 if (!eni_vcc) return -ENOMEM;
1921                 vcc->dev_data = eni_vcc;
1922                 eni_vcc->tx = NULL; /* for eni_close after open_rx */
1923                 if ((error = open_rx_first(vcc))) {
1924                         eni_close(vcc);
1925                         return error;
1926                 }
1927                 if ((error = open_tx_first(vcc))) {
1928                         eni_close(vcc);
1929                         return error;
1930                 }
1931         }
1932         if (vci == ATM_VPI_UNSPEC || vpi == ATM_VCI_UNSPEC) return 0;
1933         if ((error = open_rx_second(vcc))) {
1934                 eni_close(vcc);
1935                 return error;
1936         }
1937         if ((error = open_tx_second(vcc))) {
1938                 eni_close(vcc);
1939                 return error;
1940         }
1941         set_bit(ATM_VF_READY,&vcc->flags);
1942         /* should power down SUNI while !ref_count @@@ */
1943         return 0;
1944 }
1945
1946
1947 static int eni_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flgs)
1948 {
1949         struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1950         struct eni_tx *tx = ENI_VCC(vcc)->tx;
1951         struct sk_buff *skb;
1952         int error,rate,rsv,shp;
1953
1954         if (qos->txtp.traffic_class == ATM_NONE) return 0;
1955         if (tx == eni_dev->ubr) return -EBADFD;
1956         rate = atm_pcr_goal(&qos->txtp);
1957         if (rate < 0) rate = -rate;
1958         rsv = shp = 0;
1959         if ((flgs & ATM_MF_DEC_RSV) && rate && rate < tx->reserved) rsv = 1;
1960         if ((flgs & ATM_MF_INC_RSV) && (!rate || rate > tx->reserved)) rsv = 1;
1961         if ((flgs & ATM_MF_DEC_SHP) && rate && rate < tx->shaping) shp = 1;
1962         if ((flgs & ATM_MF_INC_SHP) && (!rate || rate > tx->shaping)) shp = 1;
1963         if (!rsv && !shp) return 0;
1964         error = reserve_or_set_tx(vcc,&qos->txtp,rsv,shp);
1965         if (error) return error;
1966         if (shp && !(flgs & ATM_MF_IMMED)) return 0;
1967         /*
1968          * Walk through the send buffer and patch the rate information in all
1969          * segmentation buffer descriptors of this VCC.
1970          */
1971         tasklet_disable(&eni_dev->task);
1972         skb_queue_walk(&eni_dev->tx_queue, skb) {
1973                 void __iomem *dsc;
1974
1975                 if (ATM_SKB(skb)->vcc != vcc) continue;
1976                 dsc = tx->send+ENI_PRV_POS(skb)*4;
1977                 writel((readl(dsc) & ~(MID_SEG_RATE | MID_SEG_PR)) |
1978                     (tx->prescaler << MID_SEG_PR_SHIFT) |
1979                     (tx->resolution << MID_SEG_RATE_SHIFT), dsc);
1980         }
1981         tasklet_enable(&eni_dev->task);
1982         return 0;
1983 }
1984
1985
1986 static int eni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
1987 {
1988         struct eni_dev *eni_dev = ENI_DEV(dev);
1989
1990         if (cmd == ENI_MEMDUMP) {
1991                 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1992                 printk(KERN_WARNING "Please use /proc/atm/" DEV_LABEL ":%d "
1993                     "instead of obsolete ioctl ENI_MEMDUMP\n",dev->number);
1994                 dump(dev);
1995                 return 0;
1996         }
1997         if (cmd == ENI_SETMULT) {
1998                 struct eni_multipliers mult;
1999
2000                 if (!capable(CAP_NET_ADMIN)) return -EPERM;
2001                 if (copy_from_user(&mult, arg,
2002                     sizeof(struct eni_multipliers)))
2003                         return -EFAULT;
2004                 if ((mult.tx && mult.tx <= 100) || (mult.rx &&mult.rx <= 100) ||
2005                     mult.tx > 65536 || mult.rx > 65536)
2006                         return -EINVAL;
2007                 if (mult.tx) eni_dev->tx_mult = mult.tx;
2008                 if (mult.rx) eni_dev->rx_mult = mult.rx;
2009                 return 0;
2010         }
2011         if (cmd == ATM_SETCIRANGE) {
2012                 struct atm_cirange ci;
2013
2014                 if (copy_from_user(&ci, arg,sizeof(struct atm_cirange)))
2015                         return -EFAULT;
2016                 if ((ci.vpi_bits == 0 || ci.vpi_bits == ATM_CI_MAX) &&
2017                     (ci.vci_bits == NR_VCI_LD || ci.vpi_bits == ATM_CI_MAX))
2018                     return 0;
2019                 return -EINVAL;
2020         }
2021         if (!dev->phy->ioctl) return -ENOIOCTLCMD;
2022         return dev->phy->ioctl(dev,cmd,arg);
2023 }
2024
2025
2026 static int eni_getsockopt(struct atm_vcc *vcc,int level,int optname,
2027     void __user *optval,int optlen)
2028 {
2029         return -EINVAL;
2030 }
2031
2032
2033 static int eni_setsockopt(struct atm_vcc *vcc,int level,int optname,
2034     void __user *optval,int optlen)
2035 {
2036         return -EINVAL;
2037 }
2038
2039
2040 static int eni_send(struct atm_vcc *vcc,struct sk_buff *skb)
2041 {
2042         enum enq_res res;
2043
2044         DPRINTK(">eni_send\n");
2045         if (!ENI_VCC(vcc)->tx) {
2046                 if (vcc->pop) vcc->pop(vcc,skb);
2047                 else dev_kfree_skb(skb);
2048                 return -EINVAL;
2049         }
2050         if (!skb) {
2051                 printk(KERN_CRIT "!skb in eni_send ?\n");
2052                 if (vcc->pop) vcc->pop(vcc,skb);
2053                 return -EINVAL;
2054         }
2055         if (vcc->qos.aal == ATM_AAL0) {
2056                 if (skb->len != ATM_CELL_SIZE-1) {
2057                         if (vcc->pop) vcc->pop(vcc,skb);
2058                         else dev_kfree_skb(skb);
2059                         return -EINVAL;
2060                 }
2061                 *(u32 *) skb->data = htonl(*(u32 *) skb->data);
2062         }
2063 submitted++;
2064         ATM_SKB(skb)->vcc = vcc;
2065         tasklet_disable(&ENI_DEV(vcc->dev)->task);
2066         res = do_tx(skb);
2067         tasklet_enable(&ENI_DEV(vcc->dev)->task);
2068         if (res == enq_ok) return 0;
2069         skb_queue_tail(&ENI_VCC(vcc)->tx->backlog,skb);
2070 backlogged++;
2071         tasklet_schedule(&ENI_DEV(vcc->dev)->task);
2072         return 0;
2073 }
2074
2075 static void eni_phy_put(struct atm_dev *dev,unsigned char value,
2076     unsigned long addr)
2077 {
2078         writel(value,ENI_DEV(dev)->phy+addr*4);
2079 }
2080
2081
2082
2083 static unsigned char eni_phy_get(struct atm_dev *dev,unsigned long addr)
2084 {
2085         return readl(ENI_DEV(dev)->phy+addr*4);
2086 }
2087
2088
2089 static int eni_proc_read(struct atm_dev *dev,loff_t *pos,char *page)
2090 {
2091         struct hlist_node *node;
2092         struct sock *s;
2093         static const char *signal[] = { "LOST","unknown","okay" };
2094         struct eni_dev *eni_dev = ENI_DEV(dev);
2095         struct atm_vcc *vcc;
2096         int left,i;
2097
2098         left = *pos;
2099         if (!left)
2100                 return sprintf(page,DEV_LABEL "(itf %d) signal %s, %dkB, "
2101                     "%d cps remaining\n",dev->number,signal[(int) dev->signal],
2102                     eni_dev->mem >> 10,eni_dev->tx_bw);
2103         if (!--left)
2104                 return sprintf(page,"%4sBursts: TX"
2105 #if !defined(CONFIG_ATM_ENI_BURST_TX_16W) && \
2106     !defined(CONFIG_ATM_ENI_BURST_TX_8W) && \
2107     !defined(CONFIG_ATM_ENI_BURST_TX_4W) && \
2108     !defined(CONFIG_ATM_ENI_BURST_TX_2W)
2109                     " none"
2110 #endif
2111 #ifdef CONFIG_ATM_ENI_BURST_TX_16W
2112                     " 16W"
2113 #endif
2114 #ifdef CONFIG_ATM_ENI_BURST_TX_8W
2115                     " 8W"
2116 #endif
2117 #ifdef CONFIG_ATM_ENI_BURST_TX_4W
2118                     " 4W"
2119 #endif
2120 #ifdef CONFIG_ATM_ENI_BURST_TX_2W
2121                     " 2W"
2122 #endif
2123                     ", RX"
2124 #if !defined(CONFIG_ATM_ENI_BURST_RX_16W) && \
2125     !defined(CONFIG_ATM_ENI_BURST_RX_8W) && \
2126     !defined(CONFIG_ATM_ENI_BURST_RX_4W) && \
2127     !defined(CONFIG_ATM_ENI_BURST_RX_2W)
2128                     " none"
2129 #endif
2130 #ifdef CONFIG_ATM_ENI_BURST_RX_16W
2131                     " 16W"
2132 #endif
2133 #ifdef CONFIG_ATM_ENI_BURST_RX_8W
2134                     " 8W"
2135 #endif
2136 #ifdef CONFIG_ATM_ENI_BURST_RX_4W
2137                     " 4W"
2138 #endif
2139 #ifdef CONFIG_ATM_ENI_BURST_RX_2W
2140                     " 2W"
2141 #endif
2142 #ifndef CONFIG_ATM_ENI_TUNE_BURST
2143                     " (default)"
2144 #endif
2145                     "\n","");
2146         if (!--left)
2147                 return sprintf(page,"%4sBuffer multipliers: tx %d%%, rx %d%%\n",
2148                     "",eni_dev->tx_mult,eni_dev->rx_mult);
2149         for (i = 0; i < NR_CHAN; i++) {
2150                 struct eni_tx *tx = eni_dev->tx+i;
2151
2152                 if (!tx->send) continue;
2153                 if (!--left) {
2154                         return sprintf(page,"tx[%d]:    0x%ld-0x%ld "
2155                             "(%6ld bytes), rsv %d cps, shp %d cps%s\n",i,
2156                             (unsigned long) (tx->send - eni_dev->ram),
2157                             tx->send-eni_dev->ram+tx->words*4-1,tx->words*4,
2158                             tx->reserved,tx->shaping,
2159                             tx == eni_dev->ubr ? " (UBR)" : "");
2160                 }
2161                 if (--left) continue;
2162                 return sprintf(page,"%10sbacklog %u packets\n","",
2163                     skb_queue_len(&tx->backlog));
2164         }
2165         read_lock(&vcc_sklist_lock);
2166         for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
2167                 struct hlist_head *head = &vcc_hash[i];
2168
2169                 sk_for_each(s, node, head) {
2170                         struct eni_vcc *eni_vcc;
2171                         int length;
2172
2173                         vcc = atm_sk(s);
2174                         if (vcc->dev != dev)
2175                                 continue;
2176                         eni_vcc = ENI_VCC(vcc);
2177                         if (--left) continue;
2178                         length = sprintf(page,"vcc %4d: ",vcc->vci);
2179                         if (eni_vcc->rx) {
2180                                 length += sprintf(page+length,"0x%ld-0x%ld "
2181                                     "(%6ld bytes)",
2182                                     (unsigned long) (eni_vcc->recv - eni_dev->ram),
2183                                     eni_vcc->recv-eni_dev->ram+eni_vcc->words*4-1,
2184                                     eni_vcc->words*4);
2185                                 if (eni_vcc->tx) length += sprintf(page+length,", ");
2186                         }
2187                         if (eni_vcc->tx)
2188                                 length += sprintf(page+length,"tx[%d], txing %d bytes",
2189                                     eni_vcc->tx->index,eni_vcc->txing);
2190                         page[length] = '\n';
2191                         read_unlock(&vcc_sklist_lock);
2192                         return length+1;
2193                 }
2194         }
2195         read_unlock(&vcc_sklist_lock);
2196         for (i = 0; i < eni_dev->free_len; i++) {
2197                 struct eni_free *fe = eni_dev->free_list+i;
2198                 unsigned long offset;
2199
2200                 if (--left) continue;
2201                 offset = (unsigned long) eni_dev->ram+eni_dev->base_diff;
2202                 return sprintf(page,"free      %p-%p (%6d bytes)\n",
2203                     fe->start-offset,fe->start-offset+(1 << fe->order)-1,
2204                     1 << fe->order);
2205         }
2206         return 0;
2207 }
2208
2209
2210 static const struct atmdev_ops ops = {
2211         .open           = eni_open,
2212         .close          = eni_close,
2213         .ioctl          = eni_ioctl,
2214         .getsockopt     = eni_getsockopt,
2215         .setsockopt     = eni_setsockopt,
2216         .send           = eni_send,
2217         .phy_put        = eni_phy_put,
2218         .phy_get        = eni_phy_get,
2219         .change_qos     = eni_change_qos,
2220         .proc_read      = eni_proc_read
2221 };
2222
2223
2224 static int __devinit eni_init_one(struct pci_dev *pci_dev,
2225     const struct pci_device_id *ent)
2226 {
2227         struct atm_dev *dev;
2228         struct eni_dev *eni_dev;
2229         int error = -ENOMEM;
2230
2231         DPRINTK("eni_init_one\n");
2232
2233         if (pci_enable_device(pci_dev)) {
2234                 error = -EIO;
2235                 goto out0;
2236         }
2237
2238         eni_dev = kmalloc(sizeof(struct eni_dev),GFP_KERNEL);
2239         if (!eni_dev) goto out0;
2240         if (!cpu_zeroes) {
2241                 cpu_zeroes = pci_alloc_consistent(pci_dev,ENI_ZEROES_SIZE,
2242                     &zeroes);
2243                 if (!cpu_zeroes) goto out1;
2244         }
2245         dev = atm_dev_register(DEV_LABEL,&ops,-1,NULL);
2246         if (!dev) goto out2;
2247         pci_set_drvdata(pci_dev, dev);
2248         eni_dev->pci_dev = pci_dev;
2249         dev->dev_data = eni_dev;
2250         eni_dev->asic = ent->driver_data;
2251         error = eni_do_init(dev);
2252         if (error) goto out3;
2253         error = eni_start(dev);
2254         if (error) goto out3;
2255         eni_dev->more = eni_boards;
2256         eni_boards = dev;
2257         return 0;
2258 out3:
2259         atm_dev_deregister(dev);
2260 out2:
2261         pci_free_consistent(eni_dev->pci_dev,ENI_ZEROES_SIZE,cpu_zeroes,zeroes);
2262         cpu_zeroes = NULL;
2263 out1:
2264         kfree(eni_dev);
2265 out0:
2266         return error;
2267 }
2268
2269
2270 static struct pci_device_id eni_pci_tbl[] = {
2271         { PCI_VENDOR_ID_EF, PCI_DEVICE_ID_EF_ATM_FPGA, PCI_ANY_ID, PCI_ANY_ID,
2272           0, 0, 0 /* FPGA */ },
2273         { PCI_VENDOR_ID_EF, PCI_DEVICE_ID_EF_ATM_ASIC, PCI_ANY_ID, PCI_ANY_ID,
2274           0, 0, 1 /* ASIC */ },
2275         { 0, }
2276 };
2277 MODULE_DEVICE_TABLE(pci,eni_pci_tbl);
2278
2279
2280 static void __devexit eni_remove_one(struct pci_dev *pci_dev)
2281 {
2282         /* grrr */
2283 }
2284
2285
2286 static struct pci_driver eni_driver = {
2287         .name           = DEV_LABEL,
2288         .id_table       = eni_pci_tbl,
2289         .probe          = eni_init_one,
2290         .remove         = __devexit_p(eni_remove_one),
2291 };
2292
2293
2294 static int __init eni_init(void)
2295 {
2296         struct sk_buff *skb; /* dummy for sizeof */
2297
2298         if (sizeof(skb->cb) < sizeof(struct eni_skb_prv)) {
2299                 printk(KERN_ERR "eni_detect: skb->cb is too small (%Zd < %Zd)\n",
2300                     sizeof(skb->cb),sizeof(struct eni_skb_prv));
2301                 return -EIO;
2302         }
2303         return pci_register_driver(&eni_driver);
2304 }
2305
2306
2307 module_init(eni_init);
2308 /* @@@ since exit routine not defined, this module can not be unloaded */
2309
2310 MODULE_LICENSE("GPL");