drivers/usb/host/ohci-dbg.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  *
   7  * This file is licenced under the GPL.
   8  */
   9
  10 /*-------------------------------------------------------------------------*/
  11
  12 #ifdef DEBUG
  13
  14 #define edstring(ed_type) ({ char *temp; \
  15         switch (ed_type) { \
  16         case PIPE_CONTROL:      temp = "ctrl"; break; \
  17         case PIPE_BULK:         temp = "bulk"; break; \
  18         case PIPE_INTERRUPT:    temp = "intr"; break; \
  19         default:                temp = "isoc"; break; \
  20         }; temp;})
  21 #define pipestring(pipe) edstring(usb_pipetype(pipe))
  22
  23 /* debug| print the main components of an URB
  24  * small: 0) header + data packets 1) just header
  25  */
  26 static void __attribute__((unused))
  27 urb_print (struct urb * urb, char * str, int small)
  28 {
  29         unsigned int pipe= urb->pipe;
  30
  31         if (!urb->dev || !urb->dev->bus) {
  32                 dbg("%s URB: no dev", str);
  33                 return;
  34         }
  35
  36 #ifndef OHCI_VERBOSE_DEBUG
  37         if (urb->status != 0)
  38 #endif
  39         dbg("%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d stat=%d",
  40                     str,
  41                     urb,
  42                     usb_pipedevice (pipe),
  43                     usb_pipeendpoint (pipe),
  44                     usb_pipeout (pipe)? "out" : "in",
  45                     pipestring (pipe),
  46                     urb->transfer_flags,
  47                     urb->actual_length,
  48                     urb->transfer_buffer_length,
  49                     urb->status);
  50
  51 #ifdef  OHCI_VERBOSE_DEBUG
  52         if (!small) {
  53                 int i, len;
  54
  55                 if (usb_pipecontrol (pipe)) {
  56                         printk (KERN_DEBUG __FILE__ ": setup(8):");
  57                         for (i = 0; i < 8 ; i++)
  58                                 printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
  59                         printk ("\n");
  60                 }
  61                 if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
  62                         printk (KERN_DEBUG __FILE__ ": data(%d/%d):",
  63                                 urb->actual_length,
  64                                 urb->transfer_buffer_length);
  65                         len = usb_pipeout (pipe)?
  66                                                 urb->transfer_buffer_length: urb->actual_length;
  67                         for (i = 0; i < 16 && i < len; i++)
  68                                 printk (" %02x", ((__u8 *) urb->transfer_buffer) [i]);
  69                         printk ("%s stat:%d\n", i < len? "...": "", urb->status);
  70                 }
  71         }
  72 #endif
  73 }
  74
  75 #define ohci_dbg_sw(ohci, next, size, format, arg...) \
  76         do { \
  77         if (next) { \
  78                 unsigned s_len; \
  79                 s_len = scnprintf (*next, *size, format, ## arg ); \
  80                 *size -= s_len; *next += s_len; \
  81         } else \
  82                 ohci_dbg(ohci,format, ## arg ); \
  83         } while (0);
  84
  85
  86 static void ohci_dump_intr_mask (
  87         struct ohci_hcd *ohci,
  88         char *label,
  89         u32 mask,
  90         char **next,
  91         unsigned *size)
  92 {
  93         ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
  94                 label,
  95                 mask,
  96                 (mask & OHCI_INTR_MIE) ? " MIE" : "",
  97                 (mask & OHCI_INTR_OC) ? " OC" : "",
  98                 (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
  99                 (mask & OHCI_INTR_FNO) ? " FNO" : "",
 100                 (mask & OHCI_INTR_UE) ? " UE" : "",
 101                 (mask & OHCI_INTR_RD) ? " RD" : "",
 102                 (mask & OHCI_INTR_SF) ? " SF" : "",
 103                 (mask & OHCI_INTR_WDH) ? " WDH" : "",
 104                 (mask & OHCI_INTR_SO) ? " SO" : ""
 105                 );
 106 }
 107
 108 static void maybe_print_eds (
 109         struct ohci_hcd *ohci,
 110         char *label,
 111         u32 value,
 112         char **next,
 113         unsigned *size)
 114 {
 115         if (value)
 116                 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
 117 }
 118
 119 static char *hcfs2string (int state)
 120 {
 121         switch (state) {
 122                 case OHCI_USB_RESET:    return "reset";
 123                 case OHCI_USB_RESUME:   return "resume";
 124                 case OHCI_USB_OPER:     return "operational";
 125                 case OHCI_USB_SUSPEND:  return "suspend";
 126         }
 127         return "?";
 128 }
 129
 130 // dump control and status registers
 131 static void
 132 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
 133 {
 134         struct ohci_regs __iomem *regs = controller->regs;
 135         u32                     temp;
 136
 137         temp = ohci_readl (controller, &regs->revision) & 0xff;
 138         ohci_dbg_sw (controller, next, size,
 139                 "OHCI %d.%d, %s legacy support registers\n",
 140                 0x03 & (temp >> 4), (temp & 0x0f),
 141                 (temp & 0x10) ? "with" : "NO");
 142
 143         temp = ohci_readl (controller, &regs->control);
 144         ohci_dbg_sw (controller, next, size,
 145                 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
 146                 temp,
 147                 (temp & OHCI_CTRL_RWE) ? " RWE" : "",
 148                 (temp & OHCI_CTRL_RWC) ? " RWC" : "",
 149                 (temp & OHCI_CTRL_IR) ? " IR" : "",
 150                 hcfs2string (temp & OHCI_CTRL_HCFS),
 151                 (temp & OHCI_CTRL_BLE) ? " BLE" : "",
 152                 (temp & OHCI_CTRL_CLE) ? " CLE" : "",
 153                 (temp & OHCI_CTRL_IE) ? " IE" : "",
 154                 (temp & OHCI_CTRL_PLE) ? " PLE" : "",
 155                 temp & OHCI_CTRL_CBSR
 156                 );
 157
 158         temp = ohci_readl (controller, &regs->cmdstatus);
 159         ohci_dbg_sw (controller, next, size,
 160                 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
 161                 (temp & OHCI_SOC) >> 16,
 162                 (temp & OHCI_OCR) ? " OCR" : "",
 163                 (temp & OHCI_BLF) ? " BLF" : "",
 164                 (temp & OHCI_CLF) ? " CLF" : "",
 165                 (temp & OHCI_HCR) ? " HCR" : ""
 166                 );
 167
 168         ohci_dump_intr_mask (controller, "intrstatus",
 169                         ohci_readl (controller, &regs->intrstatus),
 170                         next, size);
 171         ohci_dump_intr_mask (controller, "intrenable",
 172                         ohci_readl (controller, &regs->intrenable),
 173                         next, size);
 174         // intrdisable always same as intrenable
 175
 176         maybe_print_eds (controller, "ed_periodcurrent",
 177                         ohci_readl (controller, &regs->ed_periodcurrent),
 178                         next, size);
 179
 180         maybe_print_eds (controller, "ed_controlhead",
 181                         ohci_readl (controller, &regs->ed_controlhead),
 182                         next, size);
 183         maybe_print_eds (controller, "ed_controlcurrent",
 184                         ohci_readl (controller, &regs->ed_controlcurrent),
 185                         next, size);
 186
 187         maybe_print_eds (controller, "ed_bulkhead",
 188                         ohci_readl (controller, &regs->ed_bulkhead),
 189                         next, size);
 190         maybe_print_eds (controller, "ed_bulkcurrent",
 191                         ohci_readl (controller, &regs->ed_bulkcurrent),
 192                         next, size);
 193
 194         maybe_print_eds (controller, "donehead",
 195                         ohci_readl (controller, &regs->donehead), next, size);
 196 }
 197
 198 #define dbg_port_sw(hc,num,value,next,size) \
 199         ohci_dbg_sw (hc, next, size, \
 200                 "roothub.portstatus [%d] " \
 201                 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
 202                 num, temp, \
 203                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
 204                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
 205                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
 206                 (temp & RH_PS_PESC) ? " PESC" : "", \
 207                 (temp & RH_PS_CSC) ? " CSC" : "", \
 208                 \
 209                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
 210                 (temp & RH_PS_PPS) ? " PPS" : "", \
 211                 (temp & RH_PS_PRS) ? " PRS" : "", \
 212                 (temp & RH_PS_POCI) ? " POCI" : "", \
 213                 (temp & RH_PS_PSS) ? " PSS" : "", \
 214                 \
 215                 (temp & RH_PS_PES) ? " PES" : "", \
 216                 (temp & RH_PS_CCS) ? " CCS" : "" \
 217                 );
 218
 219
 220 static void
 221 ohci_dump_roothub (
 222         struct ohci_hcd *controller,
 223         int verbose,
 224         char **next,
 225         unsigned *size)
 226 {
 227         u32                     temp, ndp, i;
 228
 229         temp = roothub_a (controller);
 230         if (temp == ~(u32)0)
 231                 return;
 232         ndp = (temp & RH_A_NDP);
 233
 234         if (verbose) {
 235                 ohci_dbg_sw (controller, next, size,
 236                         "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d\n", temp,
 237                         ((temp & RH_A_POTPGT) >> 24) & 0xff,
 238                         (temp & RH_A_NOCP) ? " NOCP" : "",
 239                         (temp & RH_A_OCPM) ? " OCPM" : "",
 240                         (temp & RH_A_DT) ? " DT" : "",
 241                         (temp & RH_A_NPS) ? " NPS" : "",
 242                         (temp & RH_A_PSM) ? " PSM" : "",
 243                         ndp
 244                         );
 245                 temp = roothub_b (controller);
 246                 ohci_dbg_sw (controller, next, size,
 247                         "roothub.b %08x PPCM=%04x DR=%04x\n",
 248                         temp,
 249                         (temp & RH_B_PPCM) >> 16,
 250                         (temp & RH_B_DR)
 251                         );
 252                 temp = roothub_status (controller);
 253                 ohci_dbg_sw (controller, next, size,
 254                         "roothub.status %08x%s%s%s%s%s%s\n",
 255                         temp,
 256                         (temp & RH_HS_CRWE) ? " CRWE" : "",
 257                         (temp & RH_HS_OCIC) ? " OCIC" : "",
 258                         (temp & RH_HS_LPSC) ? " LPSC" : "",
 259                         (temp & RH_HS_DRWE) ? " DRWE" : "",
 260                         (temp & RH_HS_OCI) ? " OCI" : "",
 261                         (temp & RH_HS_LPS) ? " LPS" : ""
 262                         );
 263         }
 264
 265         for (i = 0; i < ndp; i++) {
 266                 temp = roothub_portstatus (controller, i);
 267                 dbg_port_sw (controller, i, temp, next, size);
 268         }
 269 }
 270
 271 static void ohci_dump (struct ohci_hcd *controller, int verbose)
 272 {
 273         ohci_dbg (controller, "OHCI controller state\n");
 274
 275         // dumps some of the state we know about
 276         ohci_dump_status (controller, NULL, NULL);
 277         if (controller->hcca)
 278                 ohci_dbg (controller,
 279                         "hcca frame #%04x\n", ohci_frame_no(controller));
 280         ohci_dump_roothub (controller, 1, NULL, NULL);
 281 }
 282
 283 static const char data0 [] = "DATA0";
 284 static const char data1 [] = "DATA1";
 285
 286 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
 287                 const struct td *td)
 288 {
 289         u32     tmp = hc32_to_cpup (ohci, &td->hwINFO);
 290
 291         ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
 292                 label, td,
 293                 (tmp & TD_DONE) ? " (DONE)" : "",
 294                 td->urb, td->index,
 295                 hc32_to_cpup (ohci, &td->hwNextTD));
 296         if ((tmp & TD_ISO) == 0) {
 297                 const char      *toggle, *pid;
 298                 u32     cbp, be;
 299
 300                 switch (tmp & TD_T) {
 301                 case TD_T_DATA0: toggle = data0; break;
 302                 case TD_T_DATA1: toggle = data1; break;
 303                 case TD_T_TOGGLE: toggle = "(CARRY)"; break;
 304                 default: toggle = "(?)"; break;
 305                 }
 306                 switch (tmp & TD_DP) {
 307                 case TD_DP_SETUP: pid = "SETUP"; break;
 308                 case TD_DP_IN: pid = "IN"; break;
 309                 case TD_DP_OUT: pid = "OUT"; break;
 310                 default: pid = "(bad pid)"; break;
 311                 }
 312                 ohci_dbg (ohci, "     info %08x CC=%x %s DI=%d %s %s\n", tmp,
 313                         TD_CC_GET(tmp), /* EC, */ toggle,
 314                         (tmp & TD_DI) >> 21, pid,
 315                         (tmp & TD_R) ? "R" : "");
 316                 cbp = hc32_to_cpup (ohci, &td->hwCBP);
 317                 be = hc32_to_cpup (ohci, &td->hwBE);
 318                 ohci_dbg (ohci, "     cbp %08x be %08x (len %d)\n", cbp, be,
 319                         cbp ? (be + 1 - cbp) : 0);
 320         } else {
 321                 unsigned        i;
 322                 ohci_dbg (ohci, "  info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
 323                         TD_CC_GET(tmp),
 324                         (tmp >> 24) & 0x07,
 325                         (tmp & TD_DI) >> 21,
 326                         tmp & 0x0000ffff);
 327                 ohci_dbg (ohci, "  bp0 %08x be %08x\n",
 328                         hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
 329                         hc32_to_cpup (ohci, &td->hwBE));
 330                 for (i = 0; i < MAXPSW; i++) {
 331                         u16     psw = hc16_to_cpup (ohci, &td->hwPSW [i]);
 332                         int     cc = (psw >> 12) & 0x0f;
 333                         ohci_dbg (ohci, "    psw [%d] = %2x, CC=%x %s=%d\n", i,
 334                                 psw, cc,
 335                                 (cc >= 0x0e) ? "OFFSET" : "SIZE",
 336                                 psw & 0x0fff);
 337                 }
 338         }
 339 }
 340
 341 /* caller MUST own hcd spinlock if verbose is set! */
 342 static void __attribute__((unused))
 343 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
 344                 const struct ed *ed, int verbose)
 345 {
 346         u32     tmp = hc32_to_cpu (ohci, ed->hwINFO);
 347         char    *type = "";
 348
 349         ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
 350                 label,
 351                 ed, ed->state, edstring (ed->type),
 352                 hc32_to_cpup (ohci, &ed->hwNextED));
 353         switch (tmp & (ED_IN|ED_OUT)) {
 354         case ED_OUT: type = "-OUT"; break;
 355         case ED_IN: type = "-IN"; break;
 356         /* else from TDs ... control */
 357         }
 358         ohci_dbg (ohci,
 359                 "  info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
 360                 0x03ff & (tmp >> 16),
 361                 (tmp & ED_DEQUEUE) ? " DQ" : "",
 362                 (tmp & ED_ISO) ? " ISO" : "",
 363                 (tmp & ED_SKIP) ? " SKIP" : "",
 364                 (tmp & ED_LOWSPEED) ? " LOW" : "",
 365                 0x000f & (tmp >> 7),
 366                 type,
 367                 0x007f & tmp);
 368         tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
 369         ohci_dbg (ohci, "  tds: head %08x %s%s tail %08x%s\n",
 370                 tmp,
 371                 (tmp & ED_C) ? data1 : data0,
 372                 (tmp & ED_H) ? " HALT" : "",
 373                 hc32_to_cpup (ohci, &ed->hwTailP),
 374                 verbose ? "" : " (not listing)");
 375         if (verbose) {
 376                 struct list_head        *tmp;
 377
 378                 /* use ed->td_list because HC concurrently modifies
 379                  * hwNextTD as it accumulates ed_donelist.
 380                  */
 381                 list_for_each (tmp, &ed->td_list) {
 382                         struct td               *td;
 383                         td = list_entry (tmp, struct td, td_list);
 384                         ohci_dump_td (ohci, "  ->", td);
 385                 }
 386         }
 387 }
 388
 389 #else
 390 static inline void ohci_dump (struct ohci_hcd *controller, int verbose) {}
 391
 392 #undef OHCI_VERBOSE_DEBUG
 393
 394 #endif /* DEBUG */
 395
 396 /*-------------------------------------------------------------------------*/
 397
 398 #ifdef STUB_DEBUG_FILES
 399
 400 static inline void create_debug_files (struct ohci_hcd *bus) { }
 401 static inline void remove_debug_files (struct ohci_hcd *bus) { }
 402
 403 #else
 404
 405 static ssize_t
 406 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
 407 {
 408         unsigned                temp, size = count;
 409
 410         if (!ed)
 411                 return 0;
 412
 413         /* print first --> last */
 414         while (ed->ed_prev)
 415                 ed = ed->ed_prev;
 416
 417         /* dump a snapshot of the bulk or control schedule */
 418         while (ed) {
 419                 u32             info = hc32_to_cpu (ohci, ed->hwINFO);
 420                 u32             headp = hc32_to_cpu (ohci, ed->hwHeadP);
 421                 struct list_head *entry;
 422                 struct td       *td;
 423
 424                 temp = scnprintf (buf, size,
 425                         "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
 426                         ed,
 427                         (info & ED_LOWSPEED) ? 'l' : 'f',
 428                         info & 0x7f,
 429                         (info >> 7) & 0xf,
 430                         (info & ED_IN) ? "in" : "out",
 431                         0x03ff & (info >> 16),
 432                         info,
 433                         (info & ED_SKIP) ? " s" : "",
 434                         (headp & ED_H) ? " H" : "",
 435                         (headp & ED_C) ? data1 : data0);
 436                 size -= temp;
 437                 buf += temp;
 438
 439                 list_for_each (entry, &ed->td_list) {
 440                         u32             cbp, be;
 441
 442                         td = list_entry (entry, struct td, td_list);
 443                         info = hc32_to_cpup (ohci, &td->hwINFO);
 444                         cbp = hc32_to_cpup (ohci, &td->hwCBP);
 445                         be = hc32_to_cpup (ohci, &td->hwBE);
 446                         temp = scnprintf (buf, size,
 447                                         "\n\ttd %p %s %d cc=%x urb %p (%08x)",
 448                                         td,
 449                                         ({ char *pid;
 450                                         switch (info & TD_DP) {
 451                                         case TD_DP_SETUP: pid = "setup"; break;
 452                                         case TD_DP_IN: pid = "in"; break;
 453                                         case TD_DP_OUT: pid = "out"; break;
 454                                         default: pid = "(?)"; break;
 455                                          } pid;}),
 456                                         cbp ? (be + 1 - cbp) : 0,
 457                                         TD_CC_GET (info), td->urb, info);
 458                         size -= temp;
 459                         buf += temp;
 460                 }
 461
 462                 temp = scnprintf (buf, size, "\n");
 463                 size -= temp;
 464                 buf += temp;
 465
 466                 ed = ed->ed_next;
 467         }
 468         return count - size;
 469 }
 470
 471 static ssize_t
 472 show_async (struct class_device *class_dev, char *buf)
 473 {
 474         struct usb_bus          *bus;
 475         struct usb_hcd          *hcd;
 476         struct ohci_hcd         *ohci;
 477         size_t                  temp;
 478         unsigned long           flags;
 479
 480         bus = to_usb_bus(class_dev);
 481         hcd = bus->hcpriv;
 482         ohci = hcd_to_ohci(hcd);
 483
 484         /* display control and bulk lists together, for simplicity */
 485         spin_lock_irqsave (&ohci->lock, flags);
 486         temp = show_list (ohci, buf, PAGE_SIZE, ohci->ed_controltail);
 487         temp += show_list (ohci, buf + temp, PAGE_SIZE - temp, ohci->ed_bulktail);
 488         spin_unlock_irqrestore (&ohci->lock, flags);
 489
 490         return temp;
 491 }
 492 static CLASS_DEVICE_ATTR (async, S_IRUGO, show_async, NULL);
 493
 494
 495 #define DBG_SCHED_LIMIT 64
 496
 497 static ssize_t
 498 show_periodic (struct class_device *class_dev, char *buf)
 499 {
 500         struct usb_bus          *bus;
 501         struct usb_hcd          *hcd;
 502         struct ohci_hcd         *ohci;
 503         struct ed               **seen, *ed;
 504         unsigned long           flags;
 505         unsigned                temp, size, seen_count;
 506         char                    *next;
 507         unsigned                i;
 508
 509         if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, SLAB_ATOMIC)))
 510                 return 0;
 511         seen_count = 0;
 512
 513         bus = to_usb_bus(class_dev);
 514         hcd = bus->hcpriv;
 515         ohci = hcd_to_ohci(hcd);
 516         next = buf;
 517         size = PAGE_SIZE;
 518
 519         temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
 520         size -= temp;
 521         next += temp;
 522
 523         /* dump a snapshot of the periodic schedule (and load) */
 524         spin_lock_irqsave (&ohci->lock, flags);
 525         for (i = 0; i < NUM_INTS; i++) {
 526                 if (!(ed = ohci->periodic [i]))
 527                         continue;
 528
 529                 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
 530                 size -= temp;
 531                 next += temp;
 532
 533                 do {
 534                         temp = scnprintf (next, size, " ed%d/%p",
 535                                 ed->interval, ed);
 536                         size -= temp;
 537                         next += temp;
 538                         for (temp = 0; temp < seen_count; temp++) {
 539                                 if (seen [temp] == ed)
 540                                         break;
 541                         }
 542
 543                         /* show more info the first time around */
 544                         if (temp == seen_count) {
 545                                 u32     info = hc32_to_cpu (ohci, ed->hwINFO);
 546                                 struct list_head        *entry;
 547                                 unsigned                qlen = 0;
 548
 549                                 /* qlen measured here in TDs, not urbs */
 550                                 list_for_each (entry, &ed->td_list)
 551                                         qlen++;
 552
 553                                 temp = scnprintf (next, size,
 554                                         " (%cs dev%d ep%d%s-%s qlen %u"
 555                                         " max %d %08x%s%s)",
 556                                         (info & ED_LOWSPEED) ? 'l' : 'f',
 557                                         info & 0x7f,
 558                                         (info >> 7) & 0xf,
 559                                         (info & ED_IN) ? "in" : "out",
 560                                         (info & ED_ISO) ? "iso" : "int",
 561                                         qlen,
 562                                         0x03ff & (info >> 16),
 563                                         info,
 564                                         (info & ED_SKIP) ? " K" : "",
 565                                         (ed->hwHeadP &
 566                                                 cpu_to_hc32(ohci, ED_H)) ?
 567                                                         " H" : "");
 568                                 size -= temp;
 569                                 next += temp;
 570
 571                                 if (seen_count < DBG_SCHED_LIMIT)
 572                                         seen [seen_count++] = ed;
 573
 574                                 ed = ed->ed_next;
 575
 576                         } else {
 577                                 /* we've seen it and what's after */
 578                                 temp = 0;
 579                                 ed = NULL;
 580                         }
 581
 582                 } while (ed);
 583
 584                 temp = scnprintf (next, size, "\n");
 585                 size -= temp;
 586                 next += temp;
 587         }
 588         spin_unlock_irqrestore (&ohci->lock, flags);
 589         kfree (seen);
 590
 591         return PAGE_SIZE - size;
 592 }
 593 static CLASS_DEVICE_ATTR (periodic, S_IRUGO, show_periodic, NULL);
 594
 595
 596 #undef DBG_SCHED_LIMIT
 597
 598 static ssize_t
 599 show_registers (struct class_device *class_dev, char *buf)
 600 {
 601         struct usb_bus          *bus;
 602         struct usb_hcd          *hcd;
 603         struct ohci_hcd         *ohci;
 604         struct ohci_regs __iomem *regs;
 605         unsigned long           flags;
 606         unsigned                temp, size;
 607         char                    *next;
 608         u32                     rdata;
 609
 610         bus = to_usb_bus(class_dev);
 611         hcd = bus->hcpriv;
 612         ohci = hcd_to_ohci(hcd);
 613         regs = ohci->regs;
 614         next = buf;
 615         size = PAGE_SIZE;
 616
 617         spin_lock_irqsave (&ohci->lock, flags);
 618
 619         /* dump driver info, then registers in spec order */
 620
 621         ohci_dbg_sw (ohci, &next, &size,
 622                 "bus %s, device %s\n"
 623                 "%s version " DRIVER_VERSION "\n",
 624                 hcd->self.controller->bus->name,
 625                 hcd->self.controller->bus_id,
 626                 hcd_name);
 627
 628         if (bus->controller->power.power_state) {
 629                 size -= scnprintf (next, size,
 630                         "SUSPENDED (no register access)\n");
 631                 goto done;
 632         }
 633
 634         ohci_dump_status(ohci, &next, &size);
 635
 636         /* hcca */
 637         if (ohci->hcca)
 638                 ohci_dbg_sw (ohci, &next, &size,
 639                         "hcca frame 0x%04x\n", ohci_frame_no(ohci));
 640
 641         /* other registers mostly affect frame timings */
 642         rdata = ohci_readl (ohci, &regs->fminterval);
 643         temp = scnprintf (next, size,
 644                         "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
 645                         rdata, (rdata >> 31) ? "FIT " : "",
 646                         (rdata >> 16) & 0xefff, rdata & 0xffff);
 647         size -= temp;
 648         next += temp;
 649
 650         rdata = ohci_readl (ohci, &regs->fmremaining);
 651         temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
 652                         rdata, (rdata >> 31) ? "FRT " : "",
 653                         rdata & 0x3fff);
 654         size -= temp;
 655         next += temp;
 656
 657         rdata = ohci_readl (ohci, &regs->periodicstart);
 658         temp = scnprintf (next, size, "periodicstart 0x%04x\n",
 659                         rdata & 0x3fff);
 660         size -= temp;
 661         next += temp;
 662
 663         rdata = ohci_readl (ohci, &regs->lsthresh);
 664         temp = scnprintf (next, size, "lsthresh 0x%04x\n",
 665                         rdata & 0x3fff);
 666         size -= temp;
 667         next += temp;
 668
 669         /* roothub */
 670         ohci_dump_roothub (ohci, 1, &next, &size);
 671
 672 done:
 673         spin_unlock_irqrestore (&ohci->lock, flags);
 674         return PAGE_SIZE - size;
 675 }
 676 static CLASS_DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL);
 677
 678
 679 static inline void create_debug_files (struct ohci_hcd *ohci)
 680 {
 681         struct class_device *cldev = &ohci_to_hcd(ohci)->self.class_dev;
 682
 683         class_device_create_file(cldev, &class_device_attr_async);
 684         class_device_create_file(cldev, &class_device_attr_periodic);
 685         class_device_create_file(cldev, &class_device_attr_registers);
 686         ohci_dbg (ohci, "created debug files\n");
 687 }
 688
 689 static inline void remove_debug_files (struct ohci_hcd *ohci)
 690 {
 691         struct class_device *cldev = &ohci_to_hcd(ohci)->self.class_dev;
 692
 693         class_device_remove_file(cldev, &class_device_attr_async);
 694         class_device_remove_file(cldev, &class_device_attr_periodic);
 695         class_device_remove_file(cldev, &class_device_attr_registers);
 696 }
 697
 698 #endif
 699
 700 /*-------------------------------------------------------------------------*/
 701