drivers/atm/eni.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
   3
   4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   5
   6
   7 #include <linux/module.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10 #include <linux/pci.h>
  11 #include <linux/errno.h>
  12 #include <linux/atm.h>
  13 #include <linux/atmdev.h>
  14 #include <linux/sonet.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/time.h>
  17 #include <linux/delay.h>
  18 #include <linux/uio.h>
  19 #include <linux/init.h>
  20 #include <linux/atm_eni.h>
  21 #include <linux/bitops.h>
  22 #include <linux/slab.h>
  23 #include <asm/io.h>
  24 #include <linux/atomic.h>
  25 #include <linux/uaccess.h>
  26 #include <asm/string.h>
  27 #include <asm/byteorder.h>
  28
  29 #include "tonga.h"
  30 #include "midway.h"
  31 #include "suni.h"
  32 #include "eni.h"
  33
  34 /*
  35  * TODO:
  36  *
  37  * Show stoppers
  38  *  none
  39  *
  40  * Minor
  41  *  - OAM support
  42  *  - fix bugs listed below
  43  */
  44
  45 /*
  46  * KNOWN BUGS:
  47  *
  48  * - may run into JK-JK bug and deadlock
  49  * - should allocate UBR channel first
  50  * - buffer space allocation algorithm is stupid
  51  *   (RX: should be maxSDU+maxdelay*rate
  52  *    TX: should be maxSDU+min(maxSDU,maxdelay*rate) )
  53  * - doesn't support OAM cells
  54  * - eni_put_free may hang if not putting memory fragments that _complete_
  55  *   2^n block (never happens in real life, though)
  56  */
  57
  58
  59 #if 0
  60 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  61 #else
  62 #define DPRINTK(format,args...)
  63 #endif
  64
  65
  66 #ifndef CONFIG_ATM_ENI_TUNE_BURST
  67 #define CONFIG_ATM_ENI_BURST_TX_8W
  68 #define CONFIG_ATM_ENI_BURST_RX_4W
  69 #endif
  70
  71
  72 #ifndef CONFIG_ATM_ENI_DEBUG
  73
  74
  75 #define NULLCHECK(x)
  76
  77 #define EVENT(s,a,b)
  78
  79
  80 static void event_dump(void)
  81 {
  82 }
  83
  84
  85 #else
  86
  87
  88 /*
  89  * NULL pointer checking
  90  */
  91
  92 #define NULLCHECK(x) \
  93         if ((unsigned long) (x) < 0x30) \
  94                 printk(KERN_CRIT #x "==0x%lx\n",(unsigned long) (x))
  95
  96 /*
  97  * Very extensive activity logging. Greatly improves bug detection speed but
  98  * costs a few Mbps if enabled.
  99  */
 100
 101 #define EV 64
 102
 103 static const char *ev[EV];
 104 static unsigned long ev_a[EV],ev_b[EV];
 105 static int ec = 0;
 106
 107
 108 static void EVENT(const char *s,unsigned long a,unsigned long b)
 109 {
 110         ev[ec] = s;
 111         ev_a[ec] = a;
 112         ev_b[ec] = b;
 113         ec = (ec+1) % EV;
 114 }
 115
 116
 117 static void event_dump(void)
 118 {
 119         int n,i;
 120
 121         for (n = 0; n < EV; n++) {
 122                 i = (ec+n) % EV;
 123                 printk(KERN_NOTICE);
 124                 printk(ev[i] ? ev[i] : "(null)",ev_a[i],ev_b[i]);
 125         }
 126 }
 127
 128
 129 #endif /* CONFIG_ATM_ENI_DEBUG */
 130
 131
 132 /*
 133  * NExx   must not be equal at end
 134  * EExx   may be equal at end
 135  * xxPJOK verify validity of pointer jumps
 136  * xxPMOK operating on a circular buffer of "c" words
 137  */
 138
 139 #define NEPJOK(a0,a1,b) \
 140     ((a0) < (a1) ? (b) <= (a0) || (b) > (a1) : (b) <= (a0) && (b) > (a1))
 141 #define EEPJOK(a0,a1,b) \
 142     ((a0) < (a1) ? (b) < (a0) || (b) >= (a1) : (b) < (a0) && (b) >= (a1))
 143 #define NEPMOK(a0,d,b,c) NEPJOK(a0,(a0+d) & (c-1),b)
 144 #define EEPMOK(a0,d,b,c) EEPJOK(a0,(a0+d) & (c-1),b)
 145
 146
 147 static int tx_complete = 0,dma_complete = 0,queued = 0,requeued = 0,
 148   backlogged = 0,rx_enqueued = 0,rx_dequeued = 0,pushed = 0,submitted = 0,
 149   putting = 0;
 150
 151 static struct atm_dev *eni_boards = NULL;
 152
 153 /* Read/write registers on card */
 154 #define eni_in(r)       readl(eni_dev->reg+(r)*4)
 155 #define eni_out(v,r)    writel((v),eni_dev->reg+(r)*4)
 156
 157
 158 /*-------------------------------- utilities --------------------------------*/
 159
 160
 161 static void dump_mem(struct eni_dev *eni_dev)
 162 {
 163         int i;
 164
 165         for (i = 0; i < eni_dev->free_len; i++)
 166                 printk(KERN_DEBUG "  %d: %p %d\n",i,
 167                     eni_dev->free_list[i].start,
 168                     1 << eni_dev->free_list[i].order);
 169 }
 170
 171
 172 static void dump(struct atm_dev *dev)
 173 {
 174         struct eni_dev *eni_dev;
 175
 176         int i;
 177
 178         eni_dev = ENI_DEV(dev);
 179         printk(KERN_NOTICE "Free memory\n");
 180         dump_mem(eni_dev);
 181         printk(KERN_NOTICE "TX buffers\n");
 182         for (i = 0; i < NR_CHAN; i++)
 183                 if (eni_dev->tx[i].send)
 184                         printk(KERN_NOTICE "  TX %d @ %p: %ld\n",i,
 185                             eni_dev->tx[i].send,eni_dev->tx[i].words*4);
 186         printk(KERN_NOTICE "RX buffers\n");
 187         for (i = 0; i < 1024; i++)
 188                 if (eni_dev->rx_map[i] && ENI_VCC(eni_dev->rx_map[i])->rx)
 189                         printk(KERN_NOTICE "  RX %d @ %p: %ld\n",i,
 190                             ENI_VCC(eni_dev->rx_map[i])->recv,
 191                             ENI_VCC(eni_dev->rx_map[i])->words*4);
 192         printk(KERN_NOTICE "----\n");
 193 }
 194
 195
 196 static void eni_put_free(struct eni_dev *eni_dev, void __iomem *start,
 197     unsigned long size)
 198 {
 199         struct eni_free *list;
 200         int len,order;
 201
 202         DPRINTK("init 0x%lx+%ld(0x%lx)\n",start,size,size);
 203         start += eni_dev->base_diff;
 204         list = eni_dev->free_list;
 205         len = eni_dev->free_len;
 206         while (size) {
 207                 if (len >= eni_dev->free_list_size) {
 208                         printk(KERN_CRIT "eni_put_free overflow (%p,%ld)\n",
 209                             start,size);
 210                         break;
 211                 }
 212                 for (order = 0; !(((unsigned long)start | size) & (1 << order)); order++);
 213                 if (MID_MIN_BUF_SIZE > (1 << order)) {
 214                         printk(KERN_CRIT "eni_put_free: order %d too small\n",
 215                             order);
 216                         break;
 217                 }
 218                 list[len].start = (void __iomem *) start;
 219                 list[len].order = order;
 220                 len++;
 221                 start += 1 << order;
 222                 size -= 1 << order;
 223         }
 224         eni_dev->free_len = len;
 225         /*dump_mem(eni_dev);*/
 226 }
 227
 228
 229 static void __iomem *eni_alloc_mem(struct eni_dev *eni_dev, unsigned long *size)
 230 {
 231         struct eni_free *list;
 232         void __iomem *start;
 233         int len,i,order,best_order,index;
 234
 235         list = eni_dev->free_list;
 236         len = eni_dev->free_len;
 237         if (*size < MID_MIN_BUF_SIZE) *size = MID_MIN_BUF_SIZE;
 238         if (*size > MID_MAX_BUF_SIZE) return NULL;
 239         for (order = 0; (1 << order) < *size; order++)
 240                 ;
 241         DPRINTK("trying: %ld->%d\n",*size,order);
 242         best_order = 65; /* we don't have more than 2^64 of anything ... */
 243         index = 0; /* silence GCC */
 244         for (i = 0; i < len; i++)
 245                 if (list[i].order == order) {
 246                         best_order = order;
 247                         index = i;
 248                         break;
 249                 }
 250                 else if (best_order > list[i].order && list[i].order > order) {
 251                                 best_order = list[i].order;
 252                                 index = i;
 253                         }
 254         if (best_order == 65) return NULL;
 255         start = list[index].start-eni_dev->base_diff;
 256         list[index] = list[--len];
 257         eni_dev->free_len = len;
 258         *size = 1 << order;
 259         eni_put_free(eni_dev,start+*size,(1 << best_order)-*size);
 260         DPRINTK("%ld bytes (order %d) at 0x%lx\n",*size,order,start);
 261         memset_io(start,0,*size);       /* never leak data */
 262         /*dump_mem(eni_dev);*/
 263         return start;
 264 }
 265
 266
 267 static void eni_free_mem(struct eni_dev *eni_dev, void __iomem *start,
 268     unsigned long size)
 269 {
 270         struct eni_free *list;
 271         int len,i,order;
 272
 273         start += eni_dev->base_diff;
 274         list = eni_dev->free_list;
 275         len = eni_dev->free_len;
 276         for (order = -1; size; order++) size >>= 1;
 277         DPRINTK("eni_free_mem: %p+0x%lx (order %d)\n",start,size,order);
 278         for (i = 0; i < len; i++)
 279                 if (((unsigned long) list[i].start) == ((unsigned long)start^(1 << order)) &&
 280                     list[i].order == order) {
 281                         DPRINTK("match[%d]: 0x%lx/0x%lx(0x%x), %d/%d\n",i,
 282                             list[i].start,start,1 << order,list[i].order,order);
 283                         list[i] = list[--len];
 284                         start = (void __iomem *) ((unsigned long) start & ~(unsigned long) (1 << order));
 285                         order++;
 286                         i = -1;
 287                         continue;
 288                 }
 289         if (len >= eni_dev->free_list_size) {
 290                 printk(KERN_ALERT "eni_free_mem overflow (%p,%d)\n",start,
 291                     order);
 292                 return;
 293         }
 294         list[len].start = start;
 295         list[len].order = order;
 296         eni_dev->free_len = len+1;
 297         /*dump_mem(eni_dev);*/
 298 }
 299
 300
 301 /*----------------------------------- RX ------------------------------------*/
 302
 303
 304 #define ENI_VCC_NOS ((struct atm_vcc *) 1)
 305
 306
 307 static void rx_ident_err(struct atm_vcc *vcc)
 308 {
 309         struct atm_dev *dev;
 310         struct eni_dev *eni_dev;
 311         struct eni_vcc *eni_vcc;
 312
 313         dev = vcc->dev;
 314         eni_dev = ENI_DEV(dev);
 315         /* immediately halt adapter */
 316         eni_out(eni_in(MID_MC_S) &
 317             ~(MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE),MID_MC_S);
 318         /* dump useful information */
 319         eni_vcc = ENI_VCC(vcc);
 320         printk(KERN_ALERT DEV_LABEL "(itf %d): driver error - RX ident "
 321             "mismatch\n",dev->number);
 322         printk(KERN_ALERT "  VCI %d, rxing %d, words %ld\n",vcc->vci,
 323             eni_vcc->rxing,eni_vcc->words);
 324         printk(KERN_ALERT "  host descr 0x%lx, rx pos 0x%lx, descr value "
 325             "0x%x\n",eni_vcc->descr,eni_vcc->rx_pos,
 326             (unsigned) readl(eni_vcc->recv+eni_vcc->descr*4));
 327         printk(KERN_ALERT "  last %p, servicing %d\n",eni_vcc->last,
 328             eni_vcc->servicing);
 329         EVENT("---dump ends here---\n",0,0);
 330         printk(KERN_NOTICE "---recent events---\n");
 331         event_dump();
 332         ENI_DEV(dev)->fast = NULL; /* really stop it */
 333         ENI_DEV(dev)->slow = NULL;
 334         skb_queue_head_init(&ENI_DEV(dev)->rx_queue);
 335 }
 336
 337
 338 static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
 339     unsigned long skip,unsigned long size,unsigned long eff)
 340 {
 341         struct eni_dev *eni_dev;
 342         struct eni_vcc *eni_vcc;
 343         u32 dma_rd,dma_wr;
 344         u32 dma[RX_DMA_BUF*2];
 345         dma_addr_t paddr;
 346         unsigned long here;
 347         int i,j;
 348
 349         eni_dev = ENI_DEV(vcc->dev);
 350         eni_vcc = ENI_VCC(vcc);
 351         paddr = 0; /* GCC, shut up */
 352         if (skb) {
 353                 paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
 354                                        DMA_FROM_DEVICE);
 355                 if (dma_mapping_error(&eni_dev->pci_dev->dev, paddr))
 356                         goto dma_map_error;
 357                 ENI_PRV_PADDR(skb) = paddr;
 358                 if (paddr & 3)
 359                         printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %d has "
 360                             "mis-aligned RX data (0x%lx)\n",vcc->dev->number,
 361                             vcc->vci,(unsigned long) paddr);
 362                 ENI_PRV_SIZE(skb) = size+skip;
 363                     /* PDU plus descriptor */
 364                 ATM_SKB(skb)->vcc = vcc;
 365         }
 366         j = 0;
 367         if ((eff && skip) || 1) { /* @@@ actually, skip is always == 1 ... */
 368                 here = (eni_vcc->descr+skip) & (eni_vcc->words-1);
 369                 dma[j++] = (here << MID_DMA_COUNT_SHIFT) | (vcc->vci
 370                     << MID_DMA_VCI_SHIFT) | MID_DT_JK;
 371                 dma[j++] = 0;
 372         }
 373         here = (eni_vcc->descr+size+skip) & (eni_vcc->words-1);
 374         if (!eff) size += skip;
 375         else {
 376                 unsigned long words;
 377
 378                 if (!size) {
 379                         DPRINTK("strange things happen ...\n");
 380                         EVENT("strange things happen ... (skip=%ld,eff=%ld)\n",
 381                             size,eff);
 382                 }
 383                 words = eff;
 384                 if (paddr & 15) {
 385                         unsigned long init;
 386
 387                         init = 4-((paddr & 15) >> 2);
 388                         if (init > words) init = words;
 389                         dma[j++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
 390                             (vcc->vci << MID_DMA_VCI_SHIFT);
 391                         dma[j++] = paddr;
 392                         paddr += init << 2;
 393                         words -= init;
 394                 }
 395 #ifdef CONFIG_ATM_ENI_BURST_RX_16W /* may work with some PCI chipsets ... */
 396                 if (words & ~15) {
 397                         dma[j++] = MID_DT_16W | ((words >> 4) <<
 398                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 399                             MID_DMA_VCI_SHIFT);
 400                         dma[j++] = paddr;
 401                         paddr += (words & ~15) << 2;
 402                         words &= 15;
 403                 }
 404 #endif
 405 #ifdef CONFIG_ATM_ENI_BURST_RX_8W  /* works only with *some* PCI chipsets ... */
 406                 if (words & ~7) {
 407                         dma[j++] = MID_DT_8W | ((words >> 3) <<
 408                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 409                             MID_DMA_VCI_SHIFT);
 410                         dma[j++] = paddr;
 411                         paddr += (words & ~7) << 2;
 412                         words &= 7;
 413                 }
 414 #endif
 415 #ifdef CONFIG_ATM_ENI_BURST_RX_4W /* recommended */
 416                 if (words & ~3) {
 417                         dma[j++] = MID_DT_4W | ((words >> 2) <<
 418                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 419                             MID_DMA_VCI_SHIFT);
 420                         dma[j++] = paddr;
 421                         paddr += (words & ~3) << 2;
 422                         words &= 3;
 423                 }
 424 #endif
 425 #ifdef CONFIG_ATM_ENI_BURST_RX_2W /* probably useless if RX_4W, RX_8W, ... */
 426                 if (words & ~1) {
 427                         dma[j++] = MID_DT_2W | ((words >> 1) <<
 428                             MID_DMA_COUNT_SHIFT) | (vcc->vci <<
 429                             MID_DMA_VCI_SHIFT);
 430                         dma[j++] = paddr;
 431                         paddr += (words & ~1) << 2;
 432                         words &= 1;
 433                 }
 434 #endif
 435                 if (words) {
 436                         dma[j++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT)
 437                             | (vcc->vci << MID_DMA_VCI_SHIFT);
 438                         dma[j++] = paddr;
 439                 }
 440         }
 441         if (size != eff) {
 442                 dma[j++] = (here << MID_DMA_COUNT_SHIFT) |
 443                     (vcc->vci << MID_DMA_VCI_SHIFT) | MID_DT_JK;
 444                 dma[j++] = 0;
 445         }
 446         if (!j || j > 2*RX_DMA_BUF) {
 447                 printk(KERN_CRIT DEV_LABEL "!j or j too big!!!\n");
 448                 goto trouble;
 449         }
 450         dma[j-2] |= MID_DMA_END;
 451         j = j >> 1;
 452         dma_wr = eni_in(MID_DMA_WR_RX);
 453         dma_rd = eni_in(MID_DMA_RD_RX);
 454         /*
 455          * Can I move the dma_wr pointer by 2j+1 positions without overwriting
 456          * data that hasn't been read (position of dma_rd) yet ?
 457          */
 458         if (!NEPMOK(dma_wr,j+j+1,dma_rd,NR_DMA_RX)) { /* @@@ +1 is ugly */
 459                 printk(KERN_WARNING DEV_LABEL "(itf %d): RX DMA full\n",
 460                     vcc->dev->number);
 461                 goto trouble;
 462         }
 463         for (i = 0; i < j; i++) {
 464                 writel(dma[i*2],eni_dev->rx_dma+dma_wr*8);
 465                 writel(dma[i*2+1],eni_dev->rx_dma+dma_wr*8+4);
 466                 dma_wr = (dma_wr+1) & (NR_DMA_RX-1);
 467         }
 468         if (skb) {
 469                 ENI_PRV_POS(skb) = eni_vcc->descr+size+1;
 470                 skb_queue_tail(&eni_dev->rx_queue,skb);
 471                 eni_vcc->last = skb;
 472                 rx_enqueued++;
 473         }
 474         eni_vcc->descr = here;
 475         eni_out(dma_wr,MID_DMA_WR_RX);
 476         return 0;
 477
 478 trouble:
 479         if (paddr)
 480                 dma_unmap_single(&eni_dev->pci_dev->dev,paddr,skb->len,
 481                                  DMA_FROM_DEVICE);
 482 dma_map_error:
 483         if (skb) dev_kfree_skb_irq(skb);
 484         return -1;
 485 }
 486
 487
 488 static void discard(struct atm_vcc *vcc,unsigned long size)
 489 {
 490         struct eni_vcc *eni_vcc;
 491
 492         eni_vcc = ENI_VCC(vcc);
 493         EVENT("discard (size=%ld)\n",size,0);
 494         while (do_rx_dma(vcc,NULL,1,size,0)) EVENT("BUSY LOOP",0,0);
 495             /* could do a full fallback, but that might be more expensive */
 496         if (eni_vcc->rxing) ENI_PRV_POS(eni_vcc->last) += size+1;
 497         else eni_vcc->rx_pos = (eni_vcc->rx_pos+size+1) & (eni_vcc->words-1);
 498 }
 499
 500
 501 /*
 502  * TODO: should check whether direct copies (without DMA setup, dequeuing on
 503  * interrupt, etc.) aren't much faster for AAL0
 504  */
 505
 506 static int rx_aal0(struct atm_vcc *vcc)
 507 {
 508         struct eni_vcc *eni_vcc;
 509         unsigned long descr;
 510         unsigned long length;
 511         struct sk_buff *skb;
 512
 513         DPRINTK(">rx_aal0\n");
 514         eni_vcc = ENI_VCC(vcc);
 515         descr = readl(eni_vcc->recv+eni_vcc->descr*4);
 516         if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
 517                 rx_ident_err(vcc);
 518                 return 1;
 519         }
 520         if (descr & MID_RED_T) {
 521                 DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
 522                     vcc->dev->number);
 523                 length = 0;
 524                 atomic_inc(&vcc->stats->rx_err);
 525         }
 526         else {
 527                 length = ATM_CELL_SIZE-1; /* no HEC */
 528         }
 529         skb = length ? atm_alloc_charge(vcc,length,GFP_ATOMIC) : NULL;
 530         if (!skb) {
 531                 discard(vcc,length >> 2);
 532                 return 0;
 533         }
 534         skb_put(skb,length);
 535         skb->tstamp = eni_vcc->timestamp;
 536         DPRINTK("got len %ld\n",length);
 537         if (do_rx_dma(vcc,skb,1,length >> 2,length >> 2)) return 1;
 538         eni_vcc->rxing++;
 539         return 0;
 540 }
 541
 542
 543 static int rx_aal5(struct atm_vcc *vcc)
 544 {
 545         struct eni_vcc *eni_vcc;
 546         unsigned long descr;
 547         unsigned long size,eff,length;
 548         struct sk_buff *skb;
 549
 550         EVENT("rx_aal5\n",0,0);
 551         DPRINTK(">rx_aal5\n");
 552         eni_vcc = ENI_VCC(vcc);
 553         descr = readl(eni_vcc->recv+eni_vcc->descr*4);
 554         if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
 555                 rx_ident_err(vcc);
 556                 return 1;
 557         }
 558         if (descr & (MID_RED_T | MID_RED_CRC_ERR)) {
 559                 if (descr & MID_RED_T) {
 560                         EVENT("empty cell (descr=0x%lx)\n",descr,0);
 561                         DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
 562                             vcc->dev->number);
 563                         size = 0;
 564                 }
 565                 else {
 566                         static unsigned long silence = 0;
 567
 568                         if (time_after(jiffies, silence) || silence == 0) {
 569                                 printk(KERN_WARNING DEV_LABEL "(itf %d): "
 570                                     "discarding PDU(s) with CRC error\n",
 571                                     vcc->dev->number);
 572                                 silence = (jiffies+2*HZ)|1;
 573                         }
 574                         size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
 575                         EVENT("CRC error (descr=0x%lx,size=%ld)\n",descr,
 576                             size);
 577                 }
 578                 eff = length = 0;
 579                 atomic_inc(&vcc->stats->rx_err);
 580         }
 581         else {
 582                 size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
 583                 DPRINTK("size=%ld\n",size);
 584                 length = readl(eni_vcc->recv+(((eni_vcc->descr+size-1) &
 585                     (eni_vcc->words-1)))*4) & 0xffff;
 586                                 /* -trailer(2)+header(1) */
 587                 if (length && length <= (size << 2)-8 && length <=
 588                   ATM_MAX_AAL5_PDU) eff = (length+3) >> 2;
 589                 else {                           /* ^ trailer length (8) */
 590                         EVENT("bad PDU (descr=0x08%lx,length=%ld)\n",descr,
 591                             length);
 592                         printk(KERN_ERR DEV_LABEL "(itf %d): bad AAL5 PDU "
 593                             "(VCI=%d,length=%ld,size=%ld (descr 0x%lx))\n",
 594                             vcc->dev->number,vcc->vci,length,size << 2,descr);
 595                         length = eff = 0;
 596                         atomic_inc(&vcc->stats->rx_err);
 597                 }
 598         }
 599         skb = eff ? atm_alloc_charge(vcc,eff << 2,GFP_ATOMIC) : NULL;
 600         if (!skb) {
 601                 discard(vcc,size);
 602                 return 0;
 603         }
 604         skb_put(skb,length);
 605         DPRINTK("got len %ld\n",length);
 606         if (do_rx_dma(vcc,skb,1,size,eff)) return 1;
 607         eni_vcc->rxing++;
 608         return 0;
 609 }
 610
 611
 612 static inline int rx_vcc(struct atm_vcc *vcc)
 613 {
 614         void __iomem *vci_dsc;
 615         unsigned long tmp;
 616         struct eni_vcc *eni_vcc;
 617
 618         eni_vcc = ENI_VCC(vcc);
 619         vci_dsc = ENI_DEV(vcc->dev)->vci+vcc->vci*16;
 620         EVENT("rx_vcc(1)\n",0,0);
 621         while (eni_vcc->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR) >>
 622             MID_VCI_DESCR_SHIFT)) {
 623                 EVENT("rx_vcc(2: host dsc=0x%lx, nic dsc=0x%lx)\n",
 624                     eni_vcc->descr,tmp);
 625                 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
 626                     (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
 627                     MID_VCI_DESCR_SHIFT));
 628                 if (ENI_VCC(vcc)->rx(vcc)) return 1;
 629         }
 630         /* clear IN_SERVICE flag */
 631         writel(readl(vci_dsc) & ~MID_VCI_IN_SERVICE,vci_dsc);
 632         /*
 633          * If new data has arrived between evaluating the while condition and
 634          * clearing IN_SERVICE, we wouldn't be notified until additional data
 635          * follows. So we have to loop again to be sure.
 636          */
 637         EVENT("rx_vcc(3)\n",0,0);
 638         while (ENI_VCC(vcc)->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR)
 639             >> MID_VCI_DESCR_SHIFT)) {
 640                 EVENT("rx_vcc(4: host dsc=0x%lx, nic dsc=0x%lx)\n",
 641                     eni_vcc->descr,tmp);
 642                 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
 643                     (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
 644                     MID_VCI_DESCR_SHIFT));
 645                 if (ENI_VCC(vcc)->rx(vcc)) return 1;
 646         }
 647         return 0;
 648 }
 649
 650
 651 static void poll_rx(struct atm_dev *dev)
 652 {
 653         struct eni_dev *eni_dev;
 654         struct atm_vcc *curr;
 655
 656         eni_dev = ENI_DEV(dev);
 657         while ((curr = eni_dev->fast)) {
 658                 EVENT("poll_rx.fast\n",0,0);
 659                 if (rx_vcc(curr)) return;
 660                 eni_dev->fast = ENI_VCC(curr)->next;
 661                 ENI_VCC(curr)->next = ENI_VCC_NOS;
 662                 barrier();
 663                 ENI_VCC(curr)->servicing--;
 664         }
 665         while ((curr = eni_dev->slow)) {
 666                 EVENT("poll_rx.slow\n",0,0);
 667                 if (rx_vcc(curr)) return;
 668                 eni_dev->slow = ENI_VCC(curr)->next;
 669                 ENI_VCC(curr)->next = ENI_VCC_NOS;
 670                 barrier();
 671                 ENI_VCC(curr)->servicing--;
 672         }
 673 }
 674
 675
 676 static void get_service(struct atm_dev *dev)
 677 {
 678         struct eni_dev *eni_dev;
 679         struct atm_vcc *vcc;
 680         unsigned long vci;
 681
 682         DPRINTK(">get_service\n");
 683         eni_dev = ENI_DEV(dev);
 684         while (eni_in(MID_SERV_WRITE) != eni_dev->serv_read) {
 685                 vci = readl(eni_dev->service+eni_dev->serv_read*4);
 686                 eni_dev->serv_read = (eni_dev->serv_read+1) & (NR_SERVICE-1);
 687                 vcc = eni_dev->rx_map[vci & 1023];
 688                 if (!vcc) {
 689                         printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %ld not "
 690                             "found\n",dev->number,vci);
 691                         continue; /* nasty but we try to go on anyway */
 692                         /* @@@ nope, doesn't work */
 693                 }
 694                 EVENT("getting from service\n",0,0);
 695                 if (ENI_VCC(vcc)->next != ENI_VCC_NOS) {
 696                         EVENT("double service\n",0,0);
 697                         DPRINTK("Grr, servicing VCC %ld twice\n",vci);
 698                         continue;
 699                 }
 700                 ENI_VCC(vcc)->timestamp = ktime_get_real();
 701                 ENI_VCC(vcc)->next = NULL;
 702                 if (vcc->qos.rxtp.traffic_class == ATM_CBR) {
 703                         if (eni_dev->fast)
 704                                 ENI_VCC(eni_dev->last_fast)->next = vcc;
 705                         else eni_dev->fast = vcc;
 706                         eni_dev->last_fast = vcc;
 707                 }
 708                 else {
 709                         if (eni_dev->slow)
 710                                 ENI_VCC(eni_dev->last_slow)->next = vcc;
 711                         else eni_dev->slow = vcc;
 712                         eni_dev->last_slow = vcc;
 713                 }
 714                 putting++;
 715                 ENI_VCC(vcc)->servicing++;
 716         }
 717 }
 718
 719
 720 static void dequeue_rx(struct atm_dev *dev)
 721 {
 722         struct eni_dev *eni_dev;
 723         struct eni_vcc *eni_vcc;
 724         struct atm_vcc *vcc;
 725         struct sk_buff *skb;
 726         void __iomem *vci_dsc;
 727         int first;
 728
 729         eni_dev = ENI_DEV(dev);
 730         first = 1;
 731         while (1) {
 732                 skb = skb_dequeue(&eni_dev->rx_queue);
 733                 if (!skb) {
 734                         if (first) {
 735                                 DPRINTK(DEV_LABEL "(itf %d): RX but not "
 736                                     "rxing\n",dev->number);
 737                                 EVENT("nothing to dequeue\n",0,0);
 738                         }
 739                         break;
 740                 }
 741                 EVENT("dequeued (size=%ld,pos=0x%lx)\n",ENI_PRV_SIZE(skb),
 742                     ENI_PRV_POS(skb));
 743                 rx_dequeued++;
 744                 vcc = ATM_SKB(skb)->vcc;
 745                 eni_vcc = ENI_VCC(vcc);
 746                 first = 0;
 747                 vci_dsc = eni_dev->vci+vcc->vci*16;
 748                 if (!EEPMOK(eni_vcc->rx_pos,ENI_PRV_SIZE(skb),
 749                     (readl(vci_dsc+4) & MID_VCI_READ) >> MID_VCI_READ_SHIFT,
 750                     eni_vcc->words)) {
 751                         EVENT("requeuing\n",0,0);
 752                         skb_queue_head(&eni_dev->rx_queue,skb);
 753                         break;
 754                 }
 755                 eni_vcc->rxing--;
 756                 eni_vcc->rx_pos = ENI_PRV_POS(skb) & (eni_vcc->words-1);
 757                 dma_unmap_single(&eni_dev->pci_dev->dev,ENI_PRV_PADDR(skb),skb->len,
 758                                  DMA_TO_DEVICE);
 759                 if (!skb->len) dev_kfree_skb_irq(skb);
 760                 else {
 761                         EVENT("pushing (len=%ld)\n",skb->len,0);
 762                         if (vcc->qos.aal == ATM_AAL0)
 763                                 *(unsigned long *) skb->data =
 764                                     ntohl(*(unsigned long *) skb->data);
 765                         memset(skb->cb,0,sizeof(struct eni_skb_prv));
 766                         vcc->push(vcc,skb);
 767                         pushed++;
 768                 }
 769                 atomic_inc(&vcc->stats->rx);
 770         }
 771         wake_up(&eni_dev->rx_wait);
 772 }
 773
 774
 775 static int open_rx_first(struct atm_vcc *vcc)
 776 {
 777         struct eni_dev *eni_dev;
 778         struct eni_vcc *eni_vcc;
 779         unsigned long size;
 780
 781         DPRINTK("open_rx_first\n");
 782         eni_dev = ENI_DEV(vcc->dev);
 783         eni_vcc = ENI_VCC(vcc);
 784         eni_vcc->rx = NULL;
 785         if (vcc->qos.rxtp.traffic_class == ATM_NONE) return 0;
 786         size = vcc->qos.rxtp.max_sdu*eni_dev->rx_mult/100;
 787         if (size > MID_MAX_BUF_SIZE && vcc->qos.rxtp.max_sdu <=
 788             MID_MAX_BUF_SIZE)
 789                 size = MID_MAX_BUF_SIZE;
 790         eni_vcc->recv = eni_alloc_mem(eni_dev,&size);
 791         DPRINTK("rx at 0x%lx\n",eni_vcc->recv);
 792         eni_vcc->words = size >> 2;
 793         if (!eni_vcc->recv) return -ENOBUFS;
 794         eni_vcc->rx = vcc->qos.aal == ATM_AAL5 ? rx_aal5 : rx_aal0;
 795         eni_vcc->descr = 0;
 796         eni_vcc->rx_pos = 0;
 797         eni_vcc->rxing = 0;
 798         eni_vcc->servicing = 0;
 799         eni_vcc->next = ENI_VCC_NOS;
 800         return 0;
 801 }
 802
 803
 804 static int open_rx_second(struct atm_vcc *vcc)
 805 {
 806         void __iomem *here;
 807         struct eni_dev *eni_dev;
 808         struct eni_vcc *eni_vcc;
 809         unsigned long size;
 810         int order;
 811
 812         DPRINTK("open_rx_second\n");
 813         eni_dev = ENI_DEV(vcc->dev);
 814         eni_vcc = ENI_VCC(vcc);
 815         if (!eni_vcc->rx) return 0;
 816         /* set up VCI descriptor */
 817         here = eni_dev->vci+vcc->vci*16;
 818         DPRINTK("loc 0x%x\n",(unsigned) (eni_vcc->recv-eni_dev->ram)/4);
 819         size = eni_vcc->words >> 8;
 820         for (order = -1; size; order++) size >>= 1;
 821         writel(0,here+4); /* descr, read = 0 */
 822         writel(0,here+8); /* write, state, count = 0 */
 823         if (eni_dev->rx_map[vcc->vci])
 824                 printk(KERN_CRIT DEV_LABEL "(itf %d): BUG - VCI %d already "
 825                     "in use\n",vcc->dev->number,vcc->vci);
 826         eni_dev->rx_map[vcc->vci] = vcc; /* now it counts */
 827         writel(((vcc->qos.aal != ATM_AAL5 ? MID_MODE_RAW : MID_MODE_AAL5) <<
 828             MID_VCI_MODE_SHIFT) | MID_VCI_PTI_MODE |
 829             (((eni_vcc->recv-eni_dev->ram) >> (MID_LOC_SKIP+2)) <<
 830             MID_VCI_LOCATION_SHIFT) | (order << MID_VCI_SIZE_SHIFT),here);
 831         return 0;
 832 }
 833
 834
 835 static void close_rx(struct atm_vcc *vcc)
 836 {
 837         DECLARE_WAITQUEUE(wait,current);
 838         void __iomem *here;
 839         struct eni_dev *eni_dev;
 840         struct eni_vcc *eni_vcc;
 841
 842         eni_vcc = ENI_VCC(vcc);
 843         if (!eni_vcc->rx) return;
 844         eni_dev = ENI_DEV(vcc->dev);
 845         if (vcc->vpi != ATM_VPI_UNSPEC && vcc->vci != ATM_VCI_UNSPEC) {
 846                 here = eni_dev->vci+vcc->vci*16;
 847                 /* block receiver */
 848                 writel((readl(here) & ~MID_VCI_MODE) | (MID_MODE_TRASH <<
 849                     MID_VCI_MODE_SHIFT),here);
 850                 /* wait for receiver to become idle */
 851                 udelay(27);
 852                 /* discard pending cell */
 853                 writel(readl(here) & ~MID_VCI_IN_SERVICE,here);
 854                 /* don't accept any new ones */
 855                 eni_dev->rx_map[vcc->vci] = NULL;
 856                 /* wait for RX queue to drain */
 857                 DPRINTK("eni_close: waiting for RX ...\n");
 858                 EVENT("RX closing\n",0,0);
 859                 add_wait_queue(&eni_dev->rx_wait,&wait);
 860                 set_current_state(TASK_UNINTERRUPTIBLE);
 861                 barrier();
 862                 for (;;) {
 863                         /* transition service->rx: rxing++, servicing-- */
 864                         if (!eni_vcc->servicing) {
 865                                 barrier();
 866                                 if (!eni_vcc->rxing) break;
 867                         }
 868                         EVENT("drain PDUs (rx %ld, serv %ld)\n",eni_vcc->rxing,
 869                             eni_vcc->servicing);
 870                         printk(KERN_INFO "%d+%d RX left\n",eni_vcc->servicing,
 871                             eni_vcc->rxing);
 872                         schedule();
 873                         set_current_state(TASK_UNINTERRUPTIBLE);
 874                 }
 875                 for (;;) {
 876                         int at_end;
 877                         u32 tmp;
 878
 879                         tasklet_disable(&eni_dev->task);
 880                         tmp = readl(eni_dev->vci+vcc->vci*16+4) & MID_VCI_READ;
 881                         at_end = eni_vcc->rx_pos == tmp >> MID_VCI_READ_SHIFT;
 882                         tasklet_enable(&eni_dev->task);
 883                         if (at_end) break;
 884                         EVENT("drain discard (host 0x%lx, nic 0x%lx)\n",
 885                             eni_vcc->rx_pos,tmp);
 886                         printk(KERN_INFO "draining RX: host 0x%lx, nic 0x%x\n",
 887                             eni_vcc->rx_pos,tmp);
 888                         schedule();
 889                         set_current_state(TASK_UNINTERRUPTIBLE);
 890                 }
 891                 set_current_state(TASK_RUNNING);
 892                 remove_wait_queue(&eni_dev->rx_wait,&wait);
 893         }
 894         eni_free_mem(eni_dev,eni_vcc->recv,eni_vcc->words << 2);
 895         eni_vcc->rx = NULL;
 896 }
 897
 898
 899 static int start_rx(struct atm_dev *dev)
 900 {
 901         struct eni_dev *eni_dev;
 902
 903         eni_dev = ENI_DEV(dev);
 904         eni_dev->rx_map = (struct atm_vcc **) get_zeroed_page(GFP_KERNEL);
 905         if (!eni_dev->rx_map) {
 906                 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
 907                     dev->number);
 908                 free_page((unsigned long) eni_dev->free_list);
 909                 return -ENOMEM;
 910         }
 911         eni_dev->rx_mult = DEFAULT_RX_MULT;
 912         eni_dev->fast = eni_dev->last_fast = NULL;
 913         eni_dev->slow = eni_dev->last_slow = NULL;
 914         init_waitqueue_head(&eni_dev->rx_wait);
 915         skb_queue_head_init(&eni_dev->rx_queue);
 916         eni_dev->serv_read = eni_in(MID_SERV_WRITE);
 917         eni_out(0,MID_DMA_WR_RX);
 918         return 0;
 919 }
 920
 921
 922 /*----------------------------------- TX ------------------------------------*/
 923
 924
 925 enum enq_res { enq_ok,enq_next,enq_jam };
 926
 927
 928 static inline void put_dma(int chan,u32 *dma,int *j,dma_addr_t paddr,
 929     u32 size)
 930 {
 931         u32 init,words;
 932
 933         DPRINTK("put_dma: 0x%lx+0x%x\n",(unsigned long) paddr,size);
 934         EVENT("put_dma: 0x%lx+0x%lx\n",(unsigned long) paddr,size);
 935 #if 0 /* don't complain anymore */
 936         if (paddr & 3)
 937                 printk(KERN_ERR "put_dma: unaligned addr (0x%lx)\n",paddr);
 938         if (size & 3)
 939                 printk(KERN_ERR "put_dma: unaligned size (0x%lx)\n",size);
 940 #endif
 941         if (paddr & 3) {
 942                 init = 4-(paddr & 3);
 943                 if (init > size || size < 7) init = size;
 944                 DPRINTK("put_dma: %lx DMA: %d/%d bytes\n",
 945                     (unsigned long) paddr,init,size);
 946                 dma[(*j)++] = MID_DT_BYTE | (init << MID_DMA_COUNT_SHIFT) |
 947                     (chan << MID_DMA_CHAN_SHIFT);
 948                 dma[(*j)++] = paddr;
 949                 paddr += init;
 950                 size -= init;
 951         }
 952         words = size >> 2;
 953         size &= 3;
 954         if (words && (paddr & 31)) {
 955                 init = 8-((paddr & 31) >> 2);
 956                 if (init > words) init = words;
 957                 DPRINTK("put_dma: %lx DMA: %d/%d words\n",
 958                     (unsigned long) paddr,init,words);
 959                 dma[(*j)++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
 960                     (chan << MID_DMA_CHAN_SHIFT);
 961                 dma[(*j)++] = paddr;
 962                 paddr += init << 2;
 963                 words -= init;
 964         }
 965 #ifdef CONFIG_ATM_ENI_BURST_TX_16W /* may work with some PCI chipsets ... */
 966         if (words & ~15) {
 967                 DPRINTK("put_dma: %lx DMA: %d*16/%d words\n",
 968                     (unsigned long) paddr,words >> 4,words);
 969                 dma[(*j)++] = MID_DT_16W | ((words >> 4) << MID_DMA_COUNT_SHIFT)
 970                     | (chan << MID_DMA_CHAN_SHIFT);
 971                 dma[(*j)++] = paddr;
 972                 paddr += (words & ~15) << 2;
 973                 words &= 15;
 974         }
 975 #endif
 976 #ifdef CONFIG_ATM_ENI_BURST_TX_8W /* recommended */
 977         if (words & ~7) {
 978                 DPRINTK("put_dma: %lx DMA: %d*8/%d words\n",
 979                     (unsigned long) paddr,words >> 3,words);
 980                 dma[(*j)++] = MID_DT_8W | ((words >> 3) << MID_DMA_COUNT_SHIFT)
 981                     | (chan << MID_DMA_CHAN_SHIFT);
 982                 dma[(*j)++] = paddr;
 983                 paddr += (words & ~7) << 2;
 984                 words &= 7;
 985         }
 986 #endif
 987 #ifdef CONFIG_ATM_ENI_BURST_TX_4W /* probably useless if TX_8W or TX_16W */
 988         if (words & ~3) {
 989                 DPRINTK("put_dma: %lx DMA: %d*4/%d words\n",
 990                     (unsigned long) paddr,words >> 2,words);
 991                 dma[(*j)++] = MID_DT_4W | ((words >> 2) << MID_DMA_COUNT_SHIFT)
 992                     | (chan << MID_DMA_CHAN_SHIFT);
 993                 dma[(*j)++] = paddr;
 994                 paddr += (words & ~3) << 2;
 995                 words &= 3;
 996         }
 997 #endif
 998 #ifdef CONFIG_ATM_ENI_BURST_TX_2W /* probably useless if TX_4W, TX_8W, ... */
 999         if (words & ~1) {
1000                 DPRINTK("put_dma: %lx DMA: %d*2/%d words\n",
1001                     (unsigned long) paddr,words >> 1,words);
1002                 dma[(*j)++] = MID_DT_2W | ((words >> 1) << MID_DMA_COUNT_SHIFT)
1003                     | (chan << MID_DMA_CHAN_SHIFT);
1004                 dma[(*j)++] = paddr;
1005                 paddr += (words & ~1) << 2;
1006                 words &= 1;
1007         }
1008 #endif
1009         if (words) {
1010                 DPRINTK("put_dma: %lx DMA: %d words\n",(unsigned long) paddr,
1011                     words);
1012                 dma[(*j)++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT) |
1013                     (chan << MID_DMA_CHAN_SHIFT);
1014                 dma[(*j)++] = paddr;
1015                 paddr += words << 2;
1016         }
1017         if (size) {
1018                 DPRINTK("put_dma: %lx DMA: %d bytes\n",(unsigned long) paddr,
1019                     size);
1020                 dma[(*j)++] = MID_DT_BYTE | (size << MID_DMA_COUNT_SHIFT) |
1021                     (chan << MID_DMA_CHAN_SHIFT);
1022                 dma[(*j)++] = paddr;
1023         }
1024 }
1025
1026
1027 static enum enq_res do_tx(struct sk_buff *skb)
1028 {
1029         struct atm_vcc *vcc;
1030         struct eni_dev *eni_dev;
1031         struct eni_vcc *eni_vcc;
1032         struct eni_tx *tx;
1033         dma_addr_t paddr;
1034         u32 dma_rd,dma_wr;
1035         u32 size; /* in words */
1036         int aal5,dma_size,i,j;
1037         unsigned char skb_data3;
1038
1039         DPRINTK(">do_tx\n");
1040         NULLCHECK(skb);
1041         EVENT("do_tx: skb=0x%lx, %ld bytes\n",(unsigned long) skb,skb->len);
1042         vcc = ATM_SKB(skb)->vcc;
1043         NULLCHECK(vcc);
1044         eni_dev = ENI_DEV(vcc->dev);
1045         NULLCHECK(eni_dev);
1046         eni_vcc = ENI_VCC(vcc);
1047         tx = eni_vcc->tx;
1048         NULLCHECK(tx);
1049 #if 0 /* Enable this for testing with the "align" program */
1050         {
1051                 unsigned int hack = *((char *) skb->data)-'0';
1052
1053                 if (hack < 8) {
1054                         skb->data += hack;
1055                         skb->len -= hack;
1056                 }
1057         }
1058 #endif
1059 #if 0 /* should work now */
1060         if ((unsigned long) skb->data & 3)
1061                 printk(KERN_ERR DEV_LABEL "(itf %d): VCI %d has mis-aligned "
1062                     "TX data\n",vcc->dev->number,vcc->vci);
1063 #endif
1064         /*
1065          * Potential future IP speedup: make hard_header big enough to put
1066          * segmentation descriptor directly into PDU. Saves: 4 slave writes,
1067          * 1 DMA xfer & 2 DMA'ed bytes (protocol layering is for wimps :-)
1068          */
1069
1070         aal5 = vcc->qos.aal == ATM_AAL5;
1071         /* check space in buffer */
1072         if (!aal5)
1073                 size = (ATM_CELL_PAYLOAD >> 2)+TX_DESCR_SIZE;
1074                         /* cell without HEC plus segmentation header (includes
1075                            four-byte cell header) */
1076         else {
1077                 size = skb->len+4*AAL5_TRAILER+ATM_CELL_PAYLOAD-1;
1078                         /* add AAL5 trailer */
1079                 size = ((size-(size % ATM_CELL_PAYLOAD)) >> 2)+TX_DESCR_SIZE;
1080                                                 /* add segmentation header */
1081         }
1082         /*
1083          * Can I move tx_pos by size bytes without getting closer than TX_GAP
1084          * to the read pointer ? TX_GAP means to leave some space for what
1085          * the manual calls "too close".
1086          */
1087         if (!NEPMOK(tx->tx_pos,size+TX_GAP,
1088             eni_in(MID_TX_RDPTR(tx->index)),tx->words)) {
1089                 DPRINTK(DEV_LABEL "(itf %d): TX full (size %d)\n",
1090                     vcc->dev->number,size);
1091                 return enq_next;
1092         }
1093         /* check DMA */
1094         dma_wr = eni_in(MID_DMA_WR_TX);
1095         dma_rd = eni_in(MID_DMA_RD_TX);
1096         dma_size = 3; /* JK for descriptor and final fill, plus final size
1097                          mis-alignment fix */
1098 DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
1099         if (!skb_shinfo(skb)->nr_frags) dma_size += 5;
1100         else dma_size += 5*(skb_shinfo(skb)->nr_frags+1);
1101         if (dma_size > TX_DMA_BUF) {
1102                 printk(KERN_CRIT DEV_LABEL "(itf %d): needs %d DMA entries "
1103                     "(got only %d)\n",vcc->dev->number,dma_size,TX_DMA_BUF);
1104         }
1105         DPRINTK("dma_wr is %d, tx_pos is %ld\n",dma_wr,tx->tx_pos);
1106         if (dma_wr != dma_rd && ((dma_rd+NR_DMA_TX-dma_wr) & (NR_DMA_TX-1)) <
1107              dma_size) {
1108                 printk(KERN_WARNING DEV_LABEL "(itf %d): TX DMA full\n",
1109                     vcc->dev->number);
1110                 return enq_jam;
1111         }
1112         skb_data3 = skb->data[3];
1113         paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
1114                                DMA_TO_DEVICE);
1115         if (dma_mapping_error(&eni_dev->pci_dev->dev, paddr))
1116                 return enq_next;
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_headlen(skb));
1134                         else
1135                                 put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
1136                                     skb_frag_page(&skb_shinfo(skb)->frags[i]) +
1137                                         skb_frag_off(&skb_shinfo(skb)->frags[i]),
1138                                     skb_frag_size(&skb_shinfo(skb)->frags[i]));
1139         }
1140         if (skb->len & 3) {
1141                 put_dma(tx->index, eni_dev->dma, &j, eni_dev->zero.dma,
1142                         4 - (skb->len & 3));
1143         }
1144         /* JK for AAL5 trailer - AAL0 doesn't need it, but who cares ... */
1145         eni_dev->dma[j++] = (((tx->tx_pos+size) & (tx->words-1)) <<
1146              MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
1147              MID_DMA_END | MID_DT_JK;
1148         j++;
1149         DPRINTK("DMA at end: %d\n",j);
1150         /* store frame */
1151         writel((MID_SEG_TX_ID << MID_SEG_ID_SHIFT) |
1152             (aal5 ? MID_SEG_AAL5 : 0) | (tx->prescaler << MID_SEG_PR_SHIFT) |
1153             (tx->resolution << MID_SEG_RATE_SHIFT) |
1154             (size/(ATM_CELL_PAYLOAD/4)),tx->send+tx->tx_pos*4);
1155 /*printk("dsc = 0x%08lx\n",(unsigned long) readl(tx->send+tx->tx_pos*4));*/
1156         writel((vcc->vci << MID_SEG_VCI_SHIFT) |
1157             (aal5 ? 0 : (skb_data3 & 0xf)) |
1158             (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? MID_SEG_CLP : 0),
1159             tx->send+((tx->tx_pos+1) & (tx->words-1))*4);
1160         DPRINTK("size: %d, len:%d\n",size,skb->len);
1161         if (aal5)
1162                 writel(skb->len,tx->send+
1163                     ((tx->tx_pos+size-AAL5_TRAILER) & (tx->words-1))*4);
1164         j = j >> 1;
1165         for (i = 0; i < j; i++) {
1166                 writel(eni_dev->dma[i*2],eni_dev->tx_dma+dma_wr*8);
1167                 writel(eni_dev->dma[i*2+1],eni_dev->tx_dma+dma_wr*8+4);
1168                 dma_wr = (dma_wr+1) & (NR_DMA_TX-1);
1169         }
1170         ENI_PRV_POS(skb) = tx->tx_pos;
1171         ENI_PRV_SIZE(skb) = size;
1172         ENI_VCC(vcc)->txing += size;
1173         tx->tx_pos = (tx->tx_pos+size) & (tx->words-1);
1174         DPRINTK("dma_wr set to %d, tx_pos is now %ld\n",dma_wr,tx->tx_pos);
1175         eni_out(dma_wr,MID_DMA_WR_TX);
1176         skb_queue_tail(&eni_dev->tx_queue,skb);
1177         queued++;
1178         return enq_ok;
1179 }
1180
1181
1182 static void poll_tx(struct atm_dev *dev)
1183 {
1184         struct eni_tx *tx;
1185         struct sk_buff *skb;
1186         enum enq_res res;
1187         int i;
1188
1189         DPRINTK(">poll_tx\n");
1190         for (i = NR_CHAN-1; i >= 0; i--) {
1191                 tx = &ENI_DEV(dev)->tx[i];
1192                 if (tx->send)
1193                         while ((skb = skb_dequeue(&tx->backlog))) {
1194                                 res = do_tx(skb);
1195                                 if (res == enq_ok) continue;
1196                                 DPRINTK("re-queuing TX PDU\n");
1197                                 skb_queue_head(&tx->backlog,skb);
1198                                 requeued++;
1199                                 if (res == enq_jam) return;
1200                                 break;
1201                         }
1202         }
1203 }
1204
1205
1206 static void dequeue_tx(struct atm_dev *dev)
1207 {
1208         struct eni_dev *eni_dev;
1209         struct atm_vcc *vcc;
1210         struct sk_buff *skb;
1211         struct eni_tx *tx;
1212
1213         NULLCHECK(dev);
1214         eni_dev = ENI_DEV(dev);
1215         NULLCHECK(eni_dev);
1216         while ((skb = skb_dequeue(&eni_dev->tx_queue))) {
1217                 vcc = ATM_SKB(skb)->vcc;
1218                 NULLCHECK(vcc);
1219                 tx = ENI_VCC(vcc)->tx;
1220                 NULLCHECK(ENI_VCC(vcc)->tx);
1221                 DPRINTK("dequeue_tx: next 0x%lx curr 0x%x\n",ENI_PRV_POS(skb),
1222                     (unsigned) eni_in(MID_TX_DESCRSTART(tx->index)));
1223                 if (ENI_VCC(vcc)->txing < tx->words && ENI_PRV_POS(skb) ==
1224                     eni_in(MID_TX_DESCRSTART(tx->index))) {
1225                         skb_queue_head(&eni_dev->tx_queue,skb);
1226                         break;
1227                 }
1228                 ENI_VCC(vcc)->txing -= ENI_PRV_SIZE(skb);
1229                 dma_unmap_single(&eni_dev->pci_dev->dev,ENI_PRV_PADDR(skb),skb->len,
1230                                  DMA_TO_DEVICE);
1231                 if (vcc->pop) vcc->pop(vcc,skb);
1232                 else dev_kfree_skb_irq(skb);
1233                 atomic_inc(&vcc->stats->tx);
1234                 wake_up(&eni_dev->tx_wait);
1235                 dma_complete++;
1236         }
1237 }
1238
1239
1240 static struct eni_tx *alloc_tx(struct eni_dev *eni_dev,int ubr)
1241 {
1242         int i;
1243
1244         for (i = !ubr; i < NR_CHAN; i++)
1245                 if (!eni_dev->tx[i].send) return eni_dev->tx+i;
1246         return NULL;
1247 }
1248
1249
1250 static int comp_tx(struct eni_dev *eni_dev,int *pcr,int reserved,int *pre,
1251     int *res,int unlimited)
1252 {
1253         static const int pre_div[] = { 4,16,128,2048 };
1254             /* 2^(((x+2)^2-(x+2))/2+1) */
1255
1256         if (unlimited) *pre = *res = 0;
1257         else {
1258                 if (*pcr > 0) {
1259                         int div;
1260
1261                         for (*pre = 0; *pre < 3; (*pre)++)
1262                                 if (TS_CLOCK/pre_div[*pre]/64 <= *pcr) break;
1263                         div = pre_div[*pre]**pcr;
1264                         DPRINTK("min div %d\n",div);
1265                         *res = TS_CLOCK/div-1;
1266                 }
1267                 else {
1268                         int div;
1269
1270                         if (!*pcr) *pcr = eni_dev->tx_bw+reserved;
1271                         for (*pre = 3; *pre >= 0; (*pre)--)
1272                                 if (TS_CLOCK/pre_div[*pre]/64 > -*pcr) break;
1273                         if (*pre < 3) (*pre)++; /* else fail later */
1274                         div = pre_div[*pre]*-*pcr;
1275                         DPRINTK("max div %d\n",div);
1276                         *res = DIV_ROUND_UP(TS_CLOCK, div)-1;
1277                 }
1278                 if (*res < 0) *res = 0;
1279                 if (*res > MID_SEG_MAX_RATE) *res = MID_SEG_MAX_RATE;
1280         }
1281         *pcr = TS_CLOCK/pre_div[*pre]/(*res+1);
1282         DPRINTK("out pcr: %d (%d:%d)\n",*pcr,*pre,*res);
1283         return 0;
1284 }
1285
1286
1287 static int reserve_or_set_tx(struct atm_vcc *vcc,struct atm_trafprm *txtp,
1288     int set_rsv,int set_shp)
1289 {
1290         struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1291         struct eni_vcc *eni_vcc = ENI_VCC(vcc);
1292         struct eni_tx *tx;
1293         unsigned long size;
1294         void __iomem *mem;
1295         int rate,ubr,unlimited,new_tx;
1296         int pre,res,order;
1297         int error;
1298
1299         rate = atm_pcr_goal(txtp);
1300         ubr = txtp->traffic_class == ATM_UBR;
1301         unlimited = ubr && (!rate || rate <= -ATM_OC3_PCR ||
1302             rate >= ATM_OC3_PCR);
1303         if (!unlimited) {
1304                 size = txtp->max_sdu*eni_dev->tx_mult/100;
1305                 if (size > MID_MAX_BUF_SIZE && txtp->max_sdu <=
1306                     MID_MAX_BUF_SIZE)
1307                         size = MID_MAX_BUF_SIZE;
1308         }
1309         else {
1310                 if (eni_dev->ubr) {
1311                         eni_vcc->tx = eni_dev->ubr;
1312                         txtp->pcr = ATM_OC3_PCR;
1313                         return 0;
1314                 }
1315                 size = UBR_BUFFER;
1316         }
1317         new_tx = !eni_vcc->tx;
1318         mem = NULL; /* for gcc */
1319         if (!new_tx) tx = eni_vcc->tx;
1320         else {
1321                 mem = eni_alloc_mem(eni_dev,&size);
1322                 if (!mem) return -ENOBUFS;
1323                 tx = alloc_tx(eni_dev,unlimited);
1324                 if (!tx) {
1325                         eni_free_mem(eni_dev,mem,size);
1326                         return -EBUSY;
1327                 }
1328                 DPRINTK("got chan %d\n",tx->index);
1329                 tx->reserved = tx->shaping = 0;
1330                 tx->send = mem;
1331                 tx->words = size >> 2;
1332                 skb_queue_head_init(&tx->backlog);
1333                 for (order = 0; size > (1 << (order+10)); order++);
1334                 eni_out((order << MID_SIZE_SHIFT) |
1335                     ((tx->send-eni_dev->ram) >> (MID_LOC_SKIP+2)),
1336                     MID_TX_PLACE(tx->index));
1337                 tx->tx_pos = eni_in(MID_TX_DESCRSTART(tx->index)) &
1338                     MID_DESCR_START;
1339         }
1340         error = comp_tx(eni_dev,&rate,tx->reserved,&pre,&res,unlimited);
1341         if (!error  && txtp->min_pcr > rate) error = -EINVAL;
1342         if (!error && txtp->max_pcr && txtp->max_pcr != ATM_MAX_PCR &&
1343             txtp->max_pcr < rate) error = -EINVAL;
1344         if (!error && !ubr && rate > eni_dev->tx_bw+tx->reserved)
1345                 error = -EINVAL;
1346         if (!error && set_rsv && !set_shp && rate < tx->shaping)
1347                 error = -EINVAL;
1348         if (!error && !set_rsv && rate > tx->reserved && !ubr)
1349                 error = -EINVAL;
1350         if (error) {
1351                 if (new_tx) {
1352                         tx->send = NULL;
1353                         eni_free_mem(eni_dev,mem,size);
1354                 }
1355                 return error;
1356         }
1357         txtp->pcr = rate;
1358         if (set_rsv && !ubr) {
1359                 eni_dev->tx_bw += tx->reserved;
1360                 tx->reserved = rate;
1361                 eni_dev->tx_bw -= rate;
1362         }
1363         if (set_shp || (unlimited && new_tx)) {
1364                 if (unlimited && new_tx) eni_dev->ubr = tx;
1365                 tx->prescaler = pre;
1366                 tx->resolution = res;
1367                 tx->shaping = rate;
1368         }
1369         if (set_shp) eni_vcc->tx = tx;
1370         DPRINTK("rsv %d shp %d\n",tx->reserved,tx->shaping);
1371         return 0;
1372 }
1373
1374
1375 static int open_tx_first(struct atm_vcc *vcc)
1376 {
1377         ENI_VCC(vcc)->tx = NULL;
1378         if (vcc->qos.txtp.traffic_class == ATM_NONE) return 0;
1379         ENI_VCC(vcc)->txing = 0;
1380         return reserve_or_set_tx(vcc,&vcc->qos.txtp,1,1);
1381 }
1382
1383
1384 static int open_tx_second(struct atm_vcc *vcc)
1385 {
1386         return 0; /* nothing to do */
1387 }
1388
1389
1390 static void close_tx(struct atm_vcc *vcc)
1391 {
1392         DECLARE_WAITQUEUE(wait,current);
1393         struct eni_dev *eni_dev;
1394         struct eni_vcc *eni_vcc;
1395
1396         eni_vcc = ENI_VCC(vcc);
1397         if (!eni_vcc->tx) return;
1398         eni_dev = ENI_DEV(vcc->dev);
1399         /* wait for TX queue to drain */
1400         DPRINTK("eni_close: waiting for TX ...\n");
1401         add_wait_queue(&eni_dev->tx_wait,&wait);
1402         set_current_state(TASK_UNINTERRUPTIBLE);
1403         for (;;) {
1404                 int txing;
1405
1406                 tasklet_disable(&eni_dev->task);
1407                 txing = skb_peek(&eni_vcc->tx->backlog) || eni_vcc->txing;
1408                 tasklet_enable(&eni_dev->task);
1409                 if (!txing) break;
1410                 DPRINTK("%d TX left\n",eni_vcc->txing);
1411                 schedule();
1412                 set_current_state(TASK_UNINTERRUPTIBLE);
1413         }
1414         set_current_state(TASK_RUNNING);
1415         remove_wait_queue(&eni_dev->tx_wait,&wait);
1416         if (eni_vcc->tx != eni_dev->ubr) {
1417                 /*
1418                  * Looping a few times in here is probably far cheaper than
1419                  * keeping track of TX completions all the time, so let's poll
1420                  * a bit ...
1421                  */
1422                 while (eni_in(MID_TX_RDPTR(eni_vcc->tx->index)) !=
1423                     eni_in(MID_TX_DESCRSTART(eni_vcc->tx->index)))
1424                         schedule();
1425                 eni_free_mem(eni_dev,eni_vcc->tx->send,eni_vcc->tx->words << 2);
1426                 eni_vcc->tx->send = NULL;
1427                 eni_dev->tx_bw += eni_vcc->tx->reserved;
1428         }
1429         eni_vcc->tx = NULL;
1430 }
1431
1432
1433 static int start_tx(struct atm_dev *dev)
1434 {
1435         struct eni_dev *eni_dev;
1436         int i;
1437
1438         eni_dev = ENI_DEV(dev);
1439         eni_dev->lost = 0;
1440         eni_dev->tx_bw = ATM_OC3_PCR;
1441         eni_dev->tx_mult = DEFAULT_TX_MULT;
1442         init_waitqueue_head(&eni_dev->tx_wait);
1443         eni_dev->ubr = NULL;
1444         skb_queue_head_init(&eni_dev->tx_queue);
1445         eni_out(0,MID_DMA_WR_TX);
1446         for (i = 0; i < NR_CHAN; i++) {
1447                 eni_dev->tx[i].send = NULL;
1448                 eni_dev->tx[i].index = i;
1449         }
1450         return 0;
1451 }
1452
1453
1454 /*--------------------------------- common ----------------------------------*/
1455
1456
1457 #if 0 /* may become useful again when tuning things */
1458
1459 static void foo(void)
1460 {
1461 printk(KERN_INFO
1462   "tx_complete=%d,dma_complete=%d,queued=%d,requeued=%d,sub=%d,\n"
1463   "backlogged=%d,rx_enqueued=%d,rx_dequeued=%d,putting=%d,pushed=%d\n",
1464   tx_complete,dma_complete,queued,requeued,submitted,backlogged,
1465   rx_enqueued,rx_dequeued,putting,pushed);
1466 if (eni_boards) printk(KERN_INFO "loss: %ld\n",ENI_DEV(eni_boards)->lost);
1467 }
1468
1469 #endif
1470
1471
1472 static void bug_int(struct atm_dev *dev,unsigned long reason)
1473 {
1474         DPRINTK(">bug_int\n");
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 char * const media_name[] = {
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 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 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 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(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 -ENOMEM;
1731         }
1732         eni_dev->ioaddr = base;
1733         eni_dev->base_diff = real_base - (unsigned long) base;
1734         /* id may not be present in ASIC Tonga boards - check this @@@ */
1735         if (!eni_dev->asic) {
1736                 eprom = (base+EPROM_SIZE-sizeof(struct midway_eprom));
1737                 if (readl(&eprom->magic) != ENI155_MAGIC) {
1738                         printk("\n");
1739                         printk(KERN_ERR DEV_LABEL
1740                                "(itf %d): bad magic - expected 0x%x, got 0x%x\n",
1741                                dev->number, ENI155_MAGIC,
1742                                (unsigned)readl(&eprom->magic));
1743                         error = -EINVAL;
1744                         goto unmap;
1745                 }
1746         }
1747         eni_dev->phy = base+PHY_BASE;
1748         eni_dev->reg = base+REG_BASE;
1749         eni_dev->ram = base+RAM_BASE;
1750         last = MAP_MAX_SIZE-RAM_BASE;
1751         for (i = last-RAM_INCREMENT; i >= 0; i -= RAM_INCREMENT) {
1752                 writel(0x55555555,eni_dev->ram+i);
1753                 if (readl(eni_dev->ram+i) != 0x55555555) last = i;
1754                 else {
1755                         writel(0xAAAAAAAA,eni_dev->ram+i);
1756                         if (readl(eni_dev->ram+i) != 0xAAAAAAAA) last = i;
1757                         else writel(i,eni_dev->ram+i);
1758                 }
1759         }
1760         for (i = 0; i < last; i += RAM_INCREMENT)
1761                 if (readl(eni_dev->ram+i) != i) break;
1762         eni_dev->mem = i;
1763         memset_io(eni_dev->ram,0,eni_dev->mem);
1764         /* TODO: should shrink allocation now */
1765         printk("mem=%dkB (",eni_dev->mem >> 10);
1766         /* TODO: check for non-SUNI, check for TAXI ? */
1767         if (!(eni_in(MID_RES_ID_MCON) & 0x200) != !eni_dev->asic) {
1768                 printk(")\n");
1769                 printk(KERN_ERR DEV_LABEL "(itf %d): ERROR - wrong id 0x%x\n",
1770                     dev->number,(unsigned) eni_in(MID_RES_ID_MCON));
1771                 error = -EINVAL;
1772                 goto unmap;
1773         }
1774         error = eni_dev->asic ? get_esi_asic(dev) : get_esi_fpga(dev,base);
1775         if (error)
1776                 goto unmap;
1777         for (i = 0; i < ESI_LEN; i++)
1778                 printk("%s%02X",i ? "-" : "",dev->esi[i]);
1779         printk(")\n");
1780         printk(KERN_NOTICE DEV_LABEL "(itf %d): %s,%s\n",dev->number,
1781             eni_in(MID_RES_ID_MCON) & 0x200 ? "ASIC" : "FPGA",
1782             media_name[eni_in(MID_RES_ID_MCON) & DAUGHTER_ID]);
1783
1784         error = suni_init(dev);
1785         if (error)
1786                 goto unmap;
1787 out:
1788         return error;
1789 unmap:
1790         iounmap(base);
1791         goto out;
1792 }
1793
1794 static void eni_do_release(struct atm_dev *dev)
1795 {
1796         struct eni_dev *ed = ENI_DEV(dev);
1797
1798         dev->phy->stop(dev);
1799         dev->phy = NULL;
1800         iounmap(ed->ioaddr);
1801 }
1802
1803 static int eni_start(struct atm_dev *dev)
1804 {
1805         struct eni_dev *eni_dev;
1806
1807         void __iomem *buf;
1808         unsigned long buffer_mem;
1809         int error;
1810
1811         DPRINTK(">eni_start\n");
1812         eni_dev = ENI_DEV(dev);
1813         if (request_irq(eni_dev->irq,&eni_int,IRQF_SHARED,DEV_LABEL,dev)) {
1814                 printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",
1815                     dev->number,eni_dev->irq);
1816                 error = -EAGAIN;
1817                 goto out;
1818         }
1819         pci_set_master(eni_dev->pci_dev);
1820         if ((error = pci_write_config_word(eni_dev->pci_dev,PCI_COMMAND,
1821             PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
1822             (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
1823                 printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory+"
1824                     "master (0x%02x)\n",dev->number,error);
1825                 goto free_irq;
1826         }
1827         if ((error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,
1828             END_SWAP_DMA))) {
1829                 printk(KERN_ERR DEV_LABEL "(itf %d): can't set endian swap "
1830                     "(0x%02x)\n",dev->number,error);
1831                 goto free_irq;
1832         }
1833         /* determine addresses of internal tables */
1834         eni_dev->vci = eni_dev->ram;
1835         eni_dev->rx_dma = eni_dev->ram+NR_VCI*16;
1836         eni_dev->tx_dma = eni_dev->rx_dma+NR_DMA_RX*8;
1837         eni_dev->service = eni_dev->tx_dma+NR_DMA_TX*8;
1838         buf = eni_dev->service+NR_SERVICE*4;
1839         DPRINTK("vci 0x%lx,rx 0x%lx, tx 0x%lx,srv 0x%lx,buf 0x%lx\n",
1840              eni_dev->vci,eni_dev->rx_dma,eni_dev->tx_dma,
1841              eni_dev->service,buf);
1842         spin_lock_init(&eni_dev->lock);
1843         tasklet_init(&eni_dev->task,eni_tasklet,(unsigned long) dev);
1844         eni_dev->events = 0;
1845         /* initialize memory management */
1846         buffer_mem = eni_dev->mem - (buf - eni_dev->ram);
1847         eni_dev->free_list_size = buffer_mem/MID_MIN_BUF_SIZE/2;
1848         eni_dev->free_list = kmalloc_array(eni_dev->free_list_size + 1,
1849                                            sizeof(*eni_dev->free_list),
1850                                            GFP_KERNEL);
1851         if (!eni_dev->free_list) {
1852                 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
1853                     dev->number);
1854                 error = -ENOMEM;
1855                 goto free_irq;
1856         }
1857         eni_dev->free_len = 0;
1858         eni_put_free(eni_dev,buf,buffer_mem);
1859         memset_io(eni_dev->vci,0,16*NR_VCI); /* clear VCI table */
1860         /*
1861          * byte_addr  free (k)
1862          * 0x00000000     512  VCI table
1863          * 0x00004000     496  RX DMA
1864          * 0x00005000     492  TX DMA
1865          * 0x00006000     488  service list
1866          * 0x00007000     484  buffers
1867          * 0x00080000       0  end (512kB)
1868          */
1869         eni_out(0xffffffff,MID_IE);
1870         error = start_tx(dev);
1871         if (error) goto free_list;
1872         error = start_rx(dev);
1873         if (error) goto free_list;
1874         error = dev->phy->start(dev);
1875         if (error) goto free_list;
1876         eni_out(eni_in(MID_MC_S) | (1 << MID_INT_SEL_SHIFT) |
1877             MID_TX_LOCK_MODE | MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE,
1878             MID_MC_S);
1879             /* Tonga uses SBus INTReq1 */
1880         (void) eni_in(MID_ISA); /* clear Midway interrupts */
1881         return 0;
1882
1883 free_list:
1884         kfree(eni_dev->free_list);
1885
1886 free_irq:
1887         free_irq(eni_dev->irq, dev);
1888
1889 out:
1890         return error;
1891 }
1892
1893
1894 static void eni_close(struct atm_vcc *vcc)
1895 {
1896         DPRINTK(">eni_close\n");
1897         if (!ENI_VCC(vcc)) return;
1898         clear_bit(ATM_VF_READY,&vcc->flags);
1899         close_rx(vcc);
1900         close_tx(vcc);
1901         DPRINTK("eni_close: done waiting\n");
1902         /* deallocate memory */
1903         kfree(ENI_VCC(vcc));
1904         vcc->dev_data = NULL;
1905         clear_bit(ATM_VF_ADDR,&vcc->flags);
1906         /*foo();*/
1907 }
1908
1909
1910 static int eni_open(struct atm_vcc *vcc)
1911 {
1912         struct eni_vcc *eni_vcc;
1913         int error;
1914         short vpi = vcc->vpi;
1915         int vci = vcc->vci;
1916
1917         DPRINTK(">eni_open\n");
1918         EVENT("eni_open\n",0,0);
1919         if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
1920                 vcc->dev_data = NULL;
1921         if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
1922                 set_bit(ATM_VF_ADDR,&vcc->flags);
1923         if (vcc->qos.aal != ATM_AAL0 && vcc->qos.aal != ATM_AAL5)
1924                 return -EINVAL;
1925         DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
1926             vcc->vci);
1927         if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
1928                 eni_vcc = kmalloc(sizeof(struct eni_vcc),GFP_KERNEL);
1929                 if (!eni_vcc) return -ENOMEM;
1930                 vcc->dev_data = eni_vcc;
1931                 eni_vcc->tx = NULL; /* for eni_close after open_rx */
1932                 if ((error = open_rx_first(vcc))) {
1933                         eni_close(vcc);
1934                         return error;
1935                 }
1936                 if ((error = open_tx_first(vcc))) {
1937                         eni_close(vcc);
1938                         return error;
1939                 }
1940         }
1941         if (vci == ATM_VPI_UNSPEC || vpi == ATM_VCI_UNSPEC) return 0;
1942         if ((error = open_rx_second(vcc))) {
1943                 eni_close(vcc);
1944                 return error;
1945         }
1946         if ((error = open_tx_second(vcc))) {
1947                 eni_close(vcc);
1948                 return error;
1949         }
1950         set_bit(ATM_VF_READY,&vcc->flags);
1951         /* should power down SUNI while !ref_count @@@ */
1952         return 0;
1953 }
1954
1955
1956 static int eni_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flgs)
1957 {
1958         struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1959         struct eni_tx *tx = ENI_VCC(vcc)->tx;
1960         struct sk_buff *skb;
1961         int error,rate,rsv,shp;
1962
1963         if (qos->txtp.traffic_class == ATM_NONE) return 0;
1964         if (tx == eni_dev->ubr) return -EBADFD;
1965         rate = atm_pcr_goal(&qos->txtp);
1966         if (rate < 0) rate = -rate;
1967         rsv = shp = 0;
1968         if ((flgs & ATM_MF_DEC_RSV) && rate && rate < tx->reserved) rsv = 1;
1969         if ((flgs & ATM_MF_INC_RSV) && (!rate || rate > tx->reserved)) rsv = 1;
1970         if ((flgs & ATM_MF_DEC_SHP) && rate && rate < tx->shaping) shp = 1;
1971         if ((flgs & ATM_MF_INC_SHP) && (!rate || rate > tx->shaping)) shp = 1;
1972         if (!rsv && !shp) return 0;
1973         error = reserve_or_set_tx(vcc,&qos->txtp,rsv,shp);
1974         if (error) return error;
1975         if (shp && !(flgs & ATM_MF_IMMED)) return 0;
1976         /*
1977          * Walk through the send buffer and patch the rate information in all
1978          * segmentation buffer descriptors of this VCC.
1979          */
1980         tasklet_disable(&eni_dev->task);
1981         skb_queue_walk(&eni_dev->tx_queue, skb) {
1982                 void __iomem *dsc;
1983
1984                 if (ATM_SKB(skb)->vcc != vcc) continue;
1985                 dsc = tx->send+ENI_PRV_POS(skb)*4;
1986                 writel((readl(dsc) & ~(MID_SEG_RATE | MID_SEG_PR)) |
1987                     (tx->prescaler << MID_SEG_PR_SHIFT) |
1988                     (tx->resolution << MID_SEG_RATE_SHIFT), dsc);
1989         }
1990         tasklet_enable(&eni_dev->task);
1991         return 0;
1992 }
1993
1994
1995 static int eni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
1996 {
1997         struct eni_dev *eni_dev = ENI_DEV(dev);
1998
1999         if (cmd == ENI_MEMDUMP) {
2000                 if (!capable(CAP_NET_ADMIN)) return -EPERM;
2001                 printk(KERN_WARNING "Please use /proc/atm/" DEV_LABEL ":%d "
2002                     "instead of obsolete ioctl ENI_MEMDUMP\n",dev->number);
2003                 dump(dev);
2004                 return 0;
2005         }
2006         if (cmd == ENI_SETMULT) {
2007                 struct eni_multipliers mult;
2008
2009                 if (!capable(CAP_NET_ADMIN)) return -EPERM;
2010                 if (copy_from_user(&mult, arg,
2011                     sizeof(struct eni_multipliers)))
2012                         return -EFAULT;
2013                 if ((mult.tx && mult.tx <= 100) || (mult.rx &&mult.rx <= 100) ||
2014                     mult.tx > 65536 || mult.rx > 65536)
2015                         return -EINVAL;
2016                 if (mult.tx) eni_dev->tx_mult = mult.tx;
2017                 if (mult.rx) eni_dev->rx_mult = mult.rx;
2018                 return 0;
2019         }
2020         if (cmd == ATM_SETCIRANGE) {
2021                 struct atm_cirange ci;
2022
2023                 if (copy_from_user(&ci, arg,sizeof(struct atm_cirange)))
2024                         return -EFAULT;
2025                 if ((ci.vpi_bits == 0 || ci.vpi_bits == ATM_CI_MAX) &&
2026                     (ci.vci_bits == NR_VCI_LD || ci.vpi_bits == ATM_CI_MAX))
2027                     return 0;
2028                 return -EINVAL;
2029         }
2030         if (!dev->phy->ioctl) return -ENOIOCTLCMD;
2031         return dev->phy->ioctl(dev,cmd,arg);
2032 }
2033
2034 static int eni_send(struct atm_vcc *vcc,struct sk_buff *skb)
2035 {
2036         enum enq_res res;
2037
2038         DPRINTK(">eni_send\n");
2039         if (!ENI_VCC(vcc)->tx) {
2040                 if (vcc->pop) vcc->pop(vcc,skb);
2041                 else dev_kfree_skb(skb);
2042                 return -EINVAL;
2043         }
2044         if (!skb) {
2045                 printk(KERN_CRIT "!skb in eni_send ?\n");
2046                 if (vcc->pop) vcc->pop(vcc,skb);
2047                 return -EINVAL;
2048         }
2049         if (vcc->qos.aal == ATM_AAL0) {
2050                 if (skb->len != ATM_CELL_SIZE-1) {
2051                         if (vcc->pop) vcc->pop(vcc,skb);
2052                         else dev_kfree_skb(skb);
2053                         return -EINVAL;
2054                 }
2055                 *(u32 *) skb->data = htonl(*(u32 *) skb->data);
2056         }
2057         submitted++;
2058         ATM_SKB(skb)->vcc = vcc;
2059         tasklet_disable_in_atomic(&ENI_DEV(vcc->dev)->task);
2060         res = do_tx(skb);
2061         tasklet_enable(&ENI_DEV(vcc->dev)->task);
2062         if (res == enq_ok) return 0;
2063         skb_queue_tail(&ENI_VCC(vcc)->tx->backlog,skb);
2064         backlogged++;
2065         tasklet_schedule(&ENI_DEV(vcc->dev)->task);
2066         return 0;
2067 }
2068
2069 static void eni_phy_put(struct atm_dev *dev,unsigned char value,
2070     unsigned long addr)
2071 {
2072         writel(value,ENI_DEV(dev)->phy+addr*4);
2073 }
2074
2075
2076
2077 static unsigned char eni_phy_get(struct atm_dev *dev,unsigned long addr)
2078 {
2079         return readl(ENI_DEV(dev)->phy+addr*4);
2080 }
2081
2082
2083 static int eni_proc_read(struct atm_dev *dev,loff_t *pos,char *page)
2084 {
2085         struct sock *s;
2086         static const char *signal[] = { "LOST","unknown","okay" };
2087         struct eni_dev *eni_dev = ENI_DEV(dev);
2088         struct atm_vcc *vcc;
2089         int left,i;
2090
2091         left = *pos;
2092         if (!left)
2093                 return sprintf(page,DEV_LABEL "(itf %d) signal %s, %dkB, "
2094                     "%d cps remaining\n",dev->number,signal[(int) dev->signal],
2095                     eni_dev->mem >> 10,eni_dev->tx_bw);
2096         if (!--left)
2097                 return sprintf(page,"%4sBursts: TX"
2098 #if !defined(CONFIG_ATM_ENI_BURST_TX_16W) && \
2099     !defined(CONFIG_ATM_ENI_BURST_TX_8W) && \
2100     !defined(CONFIG_ATM_ENI_BURST_TX_4W) && \
2101     !defined(CONFIG_ATM_ENI_BURST_TX_2W)
2102                     " none"
2103 #endif
2104 #ifdef CONFIG_ATM_ENI_BURST_TX_16W
2105                     " 16W"
2106 #endif
2107 #ifdef CONFIG_ATM_ENI_BURST_TX_8W
2108                     " 8W"
2109 #endif
2110 #ifdef CONFIG_ATM_ENI_BURST_TX_4W
2111                     " 4W"
2112 #endif
2113 #ifdef CONFIG_ATM_ENI_BURST_TX_2W
2114                     " 2W"
2115 #endif
2116                     ", RX"
2117 #if !defined(CONFIG_ATM_ENI_BURST_RX_16W) && \
2118     !defined(CONFIG_ATM_ENI_BURST_RX_8W) && \
2119     !defined(CONFIG_ATM_ENI_BURST_RX_4W) && \
2120     !defined(CONFIG_ATM_ENI_BURST_RX_2W)
2121                     " none"
2122 #endif
2123 #ifdef CONFIG_ATM_ENI_BURST_RX_16W
2124                     " 16W"
2125 #endif
2126 #ifdef CONFIG_ATM_ENI_BURST_RX_8W
2127                     " 8W"
2128 #endif
2129 #ifdef CONFIG_ATM_ENI_BURST_RX_4W
2130                     " 4W"
2131 #endif
2132 #ifdef CONFIG_ATM_ENI_BURST_RX_2W
2133                     " 2W"
2134 #endif
2135 #ifndef CONFIG_ATM_ENI_TUNE_BURST
2136                     " (default)"
2137 #endif
2138                     "\n","");
2139         if (!--left)
2140                 return sprintf(page,"%4sBuffer multipliers: tx %d%%, rx %d%%\n",
2141                     "",eni_dev->tx_mult,eni_dev->rx_mult);
2142         for (i = 0; i < NR_CHAN; i++) {
2143                 struct eni_tx *tx = eni_dev->tx+i;
2144
2145                 if (!tx->send) continue;
2146                 if (!--left) {
2147                         return sprintf(page, "tx[%d]:    0x%lx-0x%lx "
2148                             "(%6ld bytes), rsv %d cps, shp %d cps%s\n",i,
2149                             (unsigned long) (tx->send - eni_dev->ram),
2150                             tx->send-eni_dev->ram+tx->words*4-1,tx->words*4,
2151                             tx->reserved,tx->shaping,
2152                             tx == eni_dev->ubr ? " (UBR)" : "");
2153                 }
2154                 if (--left) continue;
2155                 return sprintf(page,"%10sbacklog %u packets\n","",
2156                     skb_queue_len(&tx->backlog));
2157         }
2158         read_lock(&vcc_sklist_lock);
2159         for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
2160                 struct hlist_head *head = &vcc_hash[i];
2161
2162                 sk_for_each(s, head) {
2163                         struct eni_vcc *eni_vcc;
2164                         int length;
2165
2166                         vcc = atm_sk(s);
2167                         if (vcc->dev != dev)
2168                                 continue;
2169                         eni_vcc = ENI_VCC(vcc);
2170                         if (--left) continue;
2171                         length = sprintf(page,"vcc %4d: ",vcc->vci);
2172                         if (eni_vcc->rx) {
2173                                 length += sprintf(page+length, "0x%lx-0x%lx "
2174                                     "(%6ld bytes)",
2175                                     (unsigned long) (eni_vcc->recv - eni_dev->ram),
2176                                     eni_vcc->recv-eni_dev->ram+eni_vcc->words*4-1,
2177                                     eni_vcc->words*4);
2178                                 if (eni_vcc->tx) length += sprintf(page+length,", ");
2179                         }
2180                         if (eni_vcc->tx)
2181                                 length += sprintf(page+length,"tx[%d], txing %d bytes",
2182                                     eni_vcc->tx->index,eni_vcc->txing);
2183                         page[length] = '\n';
2184                         read_unlock(&vcc_sklist_lock);
2185                         return length+1;
2186                 }
2187         }
2188         read_unlock(&vcc_sklist_lock);
2189         for (i = 0; i < eni_dev->free_len; i++) {
2190                 struct eni_free *fe = eni_dev->free_list+i;
2191                 unsigned long offset;
2192
2193                 if (--left) continue;
2194                 offset = (unsigned long) eni_dev->ram+eni_dev->base_diff;
2195                 return sprintf(page,"free      %p-%p (%6d bytes)\n",
2196                     fe->start-offset,fe->start-offset+(1 << fe->order)-1,
2197                     1 << fe->order);
2198         }
2199         return 0;
2200 }
2201
2202
2203 static const struct atmdev_ops ops = {
2204         .open           = eni_open,
2205         .close          = eni_close,
2206         .ioctl          = eni_ioctl,
2207         .send           = eni_send,
2208         .phy_put        = eni_phy_put,
2209         .phy_get        = eni_phy_get,
2210         .change_qos     = eni_change_qos,
2211         .proc_read      = eni_proc_read
2212 };
2213
2214
2215 static int eni_init_one(struct pci_dev *pci_dev,
2216                         const struct pci_device_id *ent)
2217 {
2218         struct atm_dev *dev;
2219         struct eni_dev *eni_dev;
2220         struct eni_zero *zero;
2221         int rc;
2222
2223         rc = pci_enable_device(pci_dev);
2224         if (rc < 0)
2225                 goto out;
2226
2227         rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32));
2228         if (rc < 0)
2229                 goto err_disable;
2230
2231         rc = -ENOMEM;
2232         eni_dev = kmalloc(sizeof(struct eni_dev), GFP_KERNEL);
2233         if (!eni_dev)
2234                 goto err_disable;
2235
2236         zero = &eni_dev->zero;
2237         zero->addr = dma_alloc_coherent(&pci_dev->dev,
2238                                         ENI_ZEROES_SIZE, &zero->dma, GFP_KERNEL);
2239         if (!zero->addr)
2240                 goto err_kfree;
2241
2242         dev = atm_dev_register(DEV_LABEL, &pci_dev->dev, &ops, -1, NULL);
2243         if (!dev)
2244                 goto err_free_consistent;
2245
2246         dev->dev_data = eni_dev;
2247         pci_set_drvdata(pci_dev, dev);
2248         eni_dev->pci_dev = pci_dev;
2249         eni_dev->asic = ent->driver_data;
2250
2251         rc = eni_do_init(dev);
2252         if (rc < 0)
2253                 goto err_unregister;
2254
2255         rc = eni_start(dev);
2256         if (rc < 0)
2257                 goto err_eni_release;
2258
2259         eni_dev->more = eni_boards;
2260         eni_boards = dev;
2261 out:
2262         return rc;
2263
2264 err_eni_release:
2265         dev->phy = NULL;
2266         iounmap(ENI_DEV(dev)->ioaddr);
2267 err_unregister:
2268         atm_dev_deregister(dev);
2269 err_free_consistent:
2270         dma_free_coherent(&pci_dev->dev, ENI_ZEROES_SIZE, zero->addr, zero->dma);
2271 err_kfree:
2272         kfree(eni_dev);
2273 err_disable:
2274         pci_disable_device(pci_dev);
2275         goto out;
2276 }
2277
2278
2279 static const struct pci_device_id eni_pci_tbl[] = {
2280         { PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_FPGA), 0 /* FPGA */ },
2281         { PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_ASIC), 1 /* ASIC */ },
2282         { 0, }
2283 };
2284 MODULE_DEVICE_TABLE(pci,eni_pci_tbl);
2285
2286
2287 static void eni_remove_one(struct pci_dev *pdev)
2288 {
2289         struct atm_dev *dev = pci_get_drvdata(pdev);
2290         struct eni_dev *ed = ENI_DEV(dev);
2291         struct eni_zero *zero = &ed->zero;
2292
2293         eni_do_release(dev);
2294         atm_dev_deregister(dev);
2295         dma_free_coherent(&pdev->dev, ENI_ZEROES_SIZE, zero->addr, zero->dma);
2296         kfree(ed);
2297         pci_disable_device(pdev);
2298 }
2299
2300
2301 static struct pci_driver eni_driver = {
2302         .name           = DEV_LABEL,
2303         .id_table       = eni_pci_tbl,
2304         .probe          = eni_init_one,
2305         .remove         = eni_remove_one,
2306 };
2307
2308
2309 static int __init eni_init(void)
2310 {
2311         struct sk_buff *skb; /* dummy for sizeof */
2312
2313         BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct eni_skb_prv));
2314         return pci_register_driver(&eni_driver);
2315 }
2316
2317
2318 module_init(eni_init);
2319 /* @@@ since exit routine not defined, this module can not be unloaded */
2320
2321 MODULE_LICENSE("GPL");