drivers/usb/host/ehci-dbg.c

   1 /*
   2  * Copyright (c) 2001-2002 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 #define ehci_dbg(ehci, fmt, args...) \
  22         dev_dbg ((ehci)->hcd.self.controller , fmt , ## args )
  23 #define ehci_err(ehci, fmt, args...) \
  24         dev_err ((ehci)->hcd.self.controller , fmt , ## args )
  25 #define ehci_info(ehci, fmt, args...) \
  26         dev_info ((ehci)->hcd.self.controller , fmt , ## args )
  27 #define ehci_warn(ehci, fmt, args...) \
  28         dev_warn ((ehci)->hcd.self.controller , fmt , ## args )
  29
  30 #ifdef EHCI_VERBOSE_DEBUG
  31 #       define vdbg dbg
  32 #       define ehci_vdbg ehci_dbg
  33 #else
  34 #       define vdbg(fmt,args...) do { } while (0)
  35 #       define ehci_vdbg(ehci, fmt, args...) do { } while (0)
  36 #endif
  37
  38 #ifdef  DEBUG
  39
  40 /* check the values in the HCSPARAMS register
  41  * (host controller _Structural_ parameters)
  42  * see EHCI spec, Table 2-4 for each value
  43  */
  44 static void dbg_hcs_params (struct ehci_hcd *ehci, char *label)
  45 {
  46         u32     params = readl (&ehci->caps->hcs_params);
  47
  48         ehci_dbg (ehci,
  49                 "%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
  50                 label, params,
  51                 HCS_DEBUG_PORT (params),
  52                 HCS_INDICATOR (params) ? " ind" : "",
  53                 HCS_N_CC (params),
  54                 HCS_N_PCC (params),
  55                 HCS_PORTROUTED (params) ? "" : " ordered",
  56                 HCS_PPC (params) ? "" : " !ppc",
  57                 HCS_N_PORTS (params)
  58                 );
  59         /* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
  60         if (HCS_PORTROUTED (params)) {
  61                 int i;
  62                 char buf [46], tmp [7], byte;
  63
  64                 buf[0] = 0;
  65                 for (i = 0; i < HCS_N_PORTS (params); i++) {
  66                         // FIXME MIPS won't readb() ...
  67                         byte = readb (&ehci->caps->portroute[(i>>1)]);
  68                         sprintf(tmp, "%d ",
  69                                 ((i & 0x1) ? ((byte)&0xf) : ((byte>>4)&0xf)));
  70                         strcat(buf, tmp);
  71                 }
  72                 ehci_dbg (ehci, "%s portroute %s\n",
  73                                 label, buf);
  74         }
  75 }
  76 #else
  77
  78 static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}
  79
  80 #endif
  81
  82 #ifdef  DEBUG
  83
  84 /* check the values in the HCCPARAMS register
  85  * (host controller _Capability_ parameters)
  86  * see EHCI Spec, Table 2-5 for each value
  87  * */
  88 static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
  89 {
  90         u32     params = readl (&ehci->caps->hcc_params);
  91
  92         if (HCC_ISOC_CACHE (params)) {
  93                 ehci_dbg (ehci,
  94                      "%s hcc_params %04x caching frame %s%s%s\n",
  95                      label, params,
  96                      HCC_PGM_FRAMELISTLEN (params) ? "256/512/1024" : "1024",
  97                      HCC_CANPARK (params) ? " park" : "",
  98                      HCC_64BIT_ADDR (params) ? " 64 bit addr" : "");
  99         } else {
 100                 ehci_dbg (ehci,
 101                      "%s hcc_params %04x thresh %d uframes %s%s%s\n",
 102                      label,
 103                      params,
 104                      HCC_ISOC_THRES (params),
 105                      HCC_PGM_FRAMELISTLEN (params) ? "256/512/1024" : "1024",
 106                      HCC_CANPARK (params) ? " park" : "",
 107                      HCC_64BIT_ADDR (params) ? " 64 bit addr" : "");
 108         }
 109 }
 110 #else
 111
 112 static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}
 113
 114 #endif
 115
 116 #ifdef  DEBUG
 117
 118 static void __attribute__((__unused__))
 119 dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
 120 {
 121         ehci_dbg (ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
 122                 cpu_to_le32p (&qtd->hw_next),
 123                 cpu_to_le32p (&qtd->hw_alt_next),
 124                 cpu_to_le32p (&qtd->hw_token),
 125                 cpu_to_le32p (&qtd->hw_buf [0]));
 126         if (qtd->hw_buf [1])
 127                 ehci_dbg (ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
 128                         cpu_to_le32p (&qtd->hw_buf [1]),
 129                         cpu_to_le32p (&qtd->hw_buf [2]),
 130                         cpu_to_le32p (&qtd->hw_buf [3]),
 131                         cpu_to_le32p (&qtd->hw_buf [4]));
 132 }
 133
 134 static void __attribute__((__unused__))
 135 dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
 136 {
 137         ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
 138                 qh, qh->hw_next, qh->hw_info1, qh->hw_info2,
 139                 qh->hw_current);
 140         dbg_qtd ("overlay", ehci, (struct ehci_qtd *) &qh->hw_qtd_next);
 141 }
 142
 143 static void __attribute__((__unused__))
 144 dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
 145 {
 146         ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n",
 147                 label, itd->frame, itd, le32_to_cpu(itd->hw_next), itd->urb);
 148         ehci_dbg (ehci,
 149                 "  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
 150                 le32_to_cpu(itd->hw_transaction[0]),
 151                 le32_to_cpu(itd->hw_transaction[1]),
 152                 le32_to_cpu(itd->hw_transaction[2]),
 153                 le32_to_cpu(itd->hw_transaction[3]),
 154                 le32_to_cpu(itd->hw_transaction[4]),
 155                 le32_to_cpu(itd->hw_transaction[5]),
 156                 le32_to_cpu(itd->hw_transaction[6]),
 157                 le32_to_cpu(itd->hw_transaction[7]));
 158         ehci_dbg (ehci,
 159                 "  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
 160                 le32_to_cpu(itd->hw_bufp[0]),
 161                 le32_to_cpu(itd->hw_bufp[1]),
 162                 le32_to_cpu(itd->hw_bufp[2]),
 163                 le32_to_cpu(itd->hw_bufp[3]),
 164                 le32_to_cpu(itd->hw_bufp[4]),
 165                 le32_to_cpu(itd->hw_bufp[5]),
 166                 le32_to_cpu(itd->hw_bufp[6]));
 167         ehci_dbg (ehci, "  index: %d %d %d %d %d %d %d %d\n",
 168                 itd->index[0], itd->index[1], itd->index[2],
 169                 itd->index[3], itd->index[4], itd->index[5],
 170                 itd->index[6], itd->index[7]);
 171 }
 172
 173 static int __attribute__((__unused__))
 174 dbg_status_buf (char *buf, unsigned len, char *label, u32 status)
 175 {
 176         return scnprintf (buf, len,
 177                 "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
 178                 label, label [0] ? " " : "", status,
 179                 (status & STS_ASS) ? " Async" : "",
 180                 (status & STS_PSS) ? " Periodic" : "",
 181                 (status & STS_RECL) ? " Recl" : "",
 182                 (status & STS_HALT) ? " Halt" : "",
 183                 (status & STS_IAA) ? " IAA" : "",
 184                 (status & STS_FATAL) ? " FATAL" : "",
 185                 (status & STS_FLR) ? " FLR" : "",
 186                 (status & STS_PCD) ? " PCD" : "",
 187                 (status & STS_ERR) ? " ERR" : "",
 188                 (status & STS_INT) ? " INT" : ""
 189                 );
 190 }
 191
 192 static int __attribute__((__unused__))
 193 dbg_intr_buf (char *buf, unsigned len, char *label, u32 enable)
 194 {
 195         return scnprintf (buf, len,
 196                 "%s%sintrenable %02x%s%s%s%s%s%s",
 197                 label, label [0] ? " " : "", enable,
 198                 (enable & STS_IAA) ? " IAA" : "",
 199                 (enable & STS_FATAL) ? " FATAL" : "",
 200                 (enable & STS_FLR) ? " FLR" : "",
 201                 (enable & STS_PCD) ? " PCD" : "",
 202                 (enable & STS_ERR) ? " ERR" : "",
 203                 (enable & STS_INT) ? " INT" : ""
 204                 );
 205 }
 206
 207 static const char *const fls_strings [] =
 208     { "1024", "512", "256", "??" };
 209
 210 static int dbg_command_buf (char *buf, unsigned len, char *label, u32 command)
 211 {
 212         return scnprintf (buf, len,
 213                 "%s%scommand %06x %s=%d ithresh=%d%s%s%s%s period=%s%s %s",
 214                 label, label [0] ? " " : "", command,
 215                 (command & CMD_PARK) ? "park" : "(park)",
 216                 CMD_PARK_CNT (command),
 217                 (command >> 16) & 0x3f,
 218                 (command & CMD_LRESET) ? " LReset" : "",
 219                 (command & CMD_IAAD) ? " IAAD" : "",
 220                 (command & CMD_ASE) ? " Async" : "",
 221                 (command & CMD_PSE) ? " Periodic" : "",
 222                 fls_strings [(command >> 2) & 0x3],
 223                 (command & CMD_RESET) ? " Reset" : "",
 224                 (command & CMD_RUN) ? "RUN" : "HALT"
 225                 );
 226 }
 227
 228 static int
 229 dbg_port_buf (char *buf, unsigned len, char *label, int port, u32 status)
 230 {
 231         char    *sig;
 232
 233         /* signaling state */
 234         switch (status & (3 << 10)) {
 235         case 0 << 10: sig = "se0"; break;
 236         case 1 << 10: sig = "k"; break;         /* low speed */
 237         case 2 << 10: sig = "j"; break;
 238         default: sig = "?"; break;
 239         }
 240
 241         return scnprintf (buf, len,
 242                 "%s%sport %d status %06x%s%s sig=%s %s%s%s%s%s%s%s%s%s",
 243                 label, label [0] ? " " : "", port, status,
 244                 (status & PORT_POWER) ? " POWER" : "",
 245                 (status & PORT_OWNER) ? " OWNER" : "",
 246                 sig,
 247                 (status & PORT_RESET) ? " RESET" : "",
 248                 (status & PORT_SUSPEND) ? " SUSPEND" : "",
 249                 (status & PORT_RESUME) ? " RESUME" : "",
 250                 (status & PORT_OCC) ? " OCC" : "",
 251                 (status & PORT_OC) ? " OC" : "",
 252                 (status & PORT_PEC) ? " PEC" : "",
 253                 (status & PORT_PE) ? " PE" : "",
 254                 (status & PORT_CSC) ? " CSC" : "",
 255                 (status & PORT_CONNECT) ? " CONNECT" : ""
 256             );
 257 }
 258
 259 #else
 260 static inline void __attribute__((__unused__))
 261 dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
 262 {}
 263
 264 static inline int __attribute__((__unused__))
 265 dbg_status_buf (char *buf, unsigned len, char *label, u32 status)
 266 { return 0; }
 267
 268 static inline int __attribute__((__unused__))
 269 dbg_command_buf (char *buf, unsigned len, char *label, u32 command)
 270 { return 0; }
 271
 272 static inline int __attribute__((__unused__))
 273 dbg_intr_buf (char *buf, unsigned len, char *label, u32 enable)
 274 { return 0; }
 275
 276 static inline int __attribute__((__unused__))
 277 dbg_port_buf (char *buf, unsigned len, char *label, int port, u32 status)
 278 { return 0; }
 279
 280 #endif  /* DEBUG */
 281
 282 /* functions have the "wrong" filename when they're output... */
 283 #define dbg_status(ehci, label, status) { \
 284         char _buf [80]; \
 285         dbg_status_buf (_buf, sizeof _buf, label, status); \
 286         ehci_dbg (ehci, "%s\n", _buf); \
 287 }
 288
 289 #define dbg_cmd(ehci, label, command) { \
 290         char _buf [80]; \
 291         dbg_command_buf (_buf, sizeof _buf, label, command); \
 292         ehci_dbg (ehci, "%s\n", _buf); \
 293 }
 294
 295 #define dbg_port(ehci, label, port, status) { \
 296         char _buf [80]; \
 297         dbg_port_buf (_buf, sizeof _buf, label, port, status); \
 298         ehci_dbg (ehci, "%s\n", _buf); \
 299 }
 300
 301 /*-------------------------------------------------------------------------*/
 302
 303 #ifdef STUB_DEBUG_FILES
 304
 305 static inline void create_debug_files (struct ehci_hcd *bus) { }
 306 static inline void remove_debug_files (struct ehci_hcd *bus) { }
 307
 308 #else
 309
 310 /* troubleshooting help: expose state in driverfs */
 311
 312 #define speed_char(info1) ({ char tmp; \
 313                 switch (info1 & (3 << 12)) { \
 314                 case 0 << 12: tmp = 'f'; break; \
 315                 case 1 << 12: tmp = 'l'; break; \
 316                 case 2 << 12: tmp = 'h'; break; \
 317                 default: tmp = '?'; break; \
 318                 }; tmp; })
 319
 320 static inline char token_mark (u32 token)
 321 {
 322         token = le32_to_cpu (token);
 323         if (token & QTD_STS_ACTIVE)
 324                 return '*';
 325         if (token & QTD_STS_HALT)
 326                 return '-';
 327         if (!IS_SHORT_READ (token))
 328                 return ' ';
 329         /* tries to advance through hw_alt_next */
 330         return '/';
 331 }
 332
 333 static void qh_lines (
 334         struct ehci_hcd *ehci,
 335         struct ehci_qh *qh,
 336         char **nextp,
 337         unsigned *sizep
 338 )
 339 {
 340         u32                     scratch;
 341         u32                     hw_curr;
 342         struct list_head        *entry;
 343         struct ehci_qtd         *td;
 344         unsigned                temp;
 345         unsigned                size = *sizep;
 346         char                    *next = *nextp;
 347         char                    mark;
 348
 349         if (qh->hw_qtd_next == EHCI_LIST_END)   /* NEC does this */
 350                 mark = '@';
 351         else
 352                 mark = token_mark (qh->hw_token);
 353         if (mark == '/') {      /* qh_alt_next controls qh advance? */
 354                 if ((qh->hw_alt_next & QTD_MASK) == ehci->async->hw_alt_next)
 355                         mark = '#';     /* blocked */
 356                 else if (qh->hw_alt_next == EHCI_LIST_END)
 357                         mark = '.';     /* use hw_qtd_next */
 358                 /* else alt_next points to some other qtd */
 359         }
 360         scratch = cpu_to_le32p (&qh->hw_info1);
 361         hw_curr = (mark == '*') ? cpu_to_le32p (&qh->hw_current) : 0;
 362         temp = scnprintf (next, size,
 363                         "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
 364                         qh, scratch & 0x007f,
 365                         speed_char (scratch),
 366                         (scratch >> 8) & 0x000f,
 367                         scratch, cpu_to_le32p (&qh->hw_info2),
 368                         cpu_to_le32p (&qh->hw_token), mark,
 369                         (__constant_cpu_to_le32 (QTD_TOGGLE) & qh->hw_token)
 370                                 ? "data1" : "data0",
 371                         (cpu_to_le32p (&qh->hw_alt_next) >> 1) & 0x0f);
 372         size -= temp;
 373         next += temp;
 374
 375         /* hc may be modifying the list as we read it ... */
 376         list_for_each (entry, &qh->qtd_list) {
 377                 td = list_entry (entry, struct ehci_qtd, qtd_list);
 378                 scratch = cpu_to_le32p (&td->hw_token);
 379                 mark = ' ';
 380                 if (hw_curr == td->qtd_dma)
 381                         mark = '*';
 382                 else if (qh->hw_qtd_next == td->qtd_dma)
 383                         mark = '+';
 384                 else if (QTD_LENGTH (scratch)) {
 385                         if (td->hw_alt_next == ehci->async->hw_alt_next)
 386                                 mark = '#';
 387                         else if (td->hw_alt_next != EHCI_LIST_END)
 388                                 mark = '/';
 389                 }
 390                 temp = snprintf (next, size,
 391                                 "\n\t%p%c%s len=%d %08x urb %p",
 392                                 td, mark, ({ char *tmp;
 393                                  switch ((scratch>>8)&0x03) {
 394                                  case 0: tmp = "out"; break;
 395                                  case 1: tmp = "in"; break;
 396                                  case 2: tmp = "setup"; break;
 397                                  default: tmp = "?"; break;
 398                                  } tmp;}),
 399                                 (scratch >> 16) & 0x7fff,
 400                                 scratch,
 401                                 td->urb);
 402                 if (temp < 0)
 403                         temp = 0;
 404                 else if (size < temp)
 405                         temp = size;
 406                 size -= temp;
 407                 next += temp;
 408                 if (temp == size)
 409                         goto done;
 410         }
 411
 412         temp = snprintf (next, size, "\n");
 413         if (temp < 0)
 414                 temp = 0;
 415         else if (size < temp)
 416                 temp = size;
 417         size -= temp;
 418         next += temp;
 419
 420 done:
 421         *sizep = size;
 422         *nextp = next;
 423 }
 424
 425 static ssize_t
 426 show_async (struct class_device *class_dev, char *buf)
 427 {
 428         struct usb_bus          *bus;
 429         struct usb_hcd          *hcd;
 430         struct ehci_hcd         *ehci;
 431         unsigned long           flags;
 432         unsigned                temp, size;
 433         char                    *next;
 434         struct ehci_qh          *qh;
 435
 436         *buf = 0;
 437
 438         bus = to_usb_bus(class_dev);
 439         hcd = bus->hcpriv;
 440         ehci = hcd_to_ehci (hcd);
 441         next = buf;
 442         size = PAGE_SIZE;
 443
 444         /* dumps a snapshot of the async schedule.
 445          * usually empty except for long-term bulk reads, or head.
 446          * one QH per line, and TDs we know about
 447          */
 448         spin_lock_irqsave (&ehci->lock, flags);
 449         for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
 450                 qh_lines (ehci, qh, &next, &size);
 451         if (ehci->reclaim && size > 0) {
 452                 temp = scnprintf (next, size, "\nreclaim =\n");
 453                 size -= temp;
 454                 next += temp;
 455
 456                 for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
 457                         qh_lines (ehci, qh, &next, &size);
 458         }
 459         spin_unlock_irqrestore (&ehci->lock, flags);
 460
 461         return strlen (buf);
 462 }
 463 static CLASS_DEVICE_ATTR (async, S_IRUGO, show_async, NULL);
 464
 465 #define DBG_SCHED_LIMIT 64
 466
 467 static ssize_t
 468 show_periodic (struct class_device *class_dev, char *buf)
 469 {
 470         struct usb_bus          *bus;
 471         struct usb_hcd          *hcd;
 472         struct ehci_hcd         *ehci;
 473         unsigned long           flags;
 474         union ehci_shadow       p, *seen;
 475         unsigned                temp, size, seen_count;
 476         char                    *next;
 477         unsigned                i, tag;
 478
 479         if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, SLAB_ATOMIC)))
 480                 return 0;
 481         seen_count = 0;
 482
 483         bus = to_usb_bus(class_dev);
 484         hcd = bus->hcpriv;
 485         ehci = hcd_to_ehci (hcd);
 486         next = buf;
 487         size = PAGE_SIZE;
 488
 489         temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
 490         size -= temp;
 491         next += temp;
 492
 493         /* dump a snapshot of the periodic schedule.
 494          * iso changes, interrupt usually doesn't.
 495          */
 496         spin_lock_irqsave (&ehci->lock, flags);
 497         for (i = 0; i < ehci->periodic_size; i++) {
 498                 p = ehci->pshadow [i];
 499                 if (likely (!p.ptr))
 500                         continue;
 501                 tag = Q_NEXT_TYPE (ehci->periodic [i]);
 502
 503                 temp = scnprintf (next, size, "%4d: ", i);
 504                 size -= temp;
 505                 next += temp;
 506
 507                 do {
 508                         switch (tag) {
 509                         case Q_TYPE_QH:
 510                                 temp = scnprintf (next, size, " qh%d-%04x/%p",
 511                                                 p.qh->period,
 512                                                 le32_to_cpup (&p.qh->hw_info2)
 513                                                         /* uframe masks */
 514                                                         & 0xffff,
 515                                                 p.qh);
 516                                 size -= temp;
 517                                 next += temp;
 518                                 /* don't repeat what follows this qh */
 519                                 for (temp = 0; temp < seen_count; temp++) {
 520                                         if (seen [temp].ptr != p.ptr)
 521                                                 continue;
 522                                         if (p.qh->qh_next.ptr)
 523                                                 temp = scnprintf (next, size,
 524                                                         " ...");
 525                                         p.ptr = 0;
 526                                         break;
 527                                 }
 528                                 /* show more info the first time around */
 529                                 if (temp == seen_count && p.ptr) {
 530                                         u32     scratch = cpu_to_le32p (
 531                                                         &p.qh->hw_info1);
 532                                         struct ehci_qtd *qtd;
 533                                         char            *type = "";
 534
 535                                         /* count tds, get ep direction */
 536                                         temp = 0;
 537                                         list_for_each_entry (qtd,
 538                                                         &p.qh->qtd_list,
 539                                                         qtd_list) {
 540                                                 temp++;
 541                                                 switch (0x03 & (le32_to_cpu (
 542                                                         qtd->hw_token) >> 8)) {
 543                                                 case 0: type = "out"; continue;
 544                                                 case 1: type = "in"; continue;
 545                                                 }
 546                                         }
 547
 548                                         temp = scnprintf (next, size,
 549                                                 " (%c%d ep%d%s "
 550                                                 "[%d/%d] q%d p%d)",
 551                                                 speed_char (scratch),
 552                                                 scratch & 0x007f,
 553                                                 (scratch >> 8) & 0x000f, type,
 554                                                 p.qh->usecs, p.qh->c_usecs,
 555                                                 temp,
 556                                                 0x7ff & (scratch >> 16));
 557
 558                                         if (seen_count < DBG_SCHED_LIMIT)
 559                                                 seen [seen_count++].qh = p.qh;
 560                                 } else
 561                                         temp = 0;
 562                                 if (p.qh) {
 563                                         tag = Q_NEXT_TYPE (p.qh->hw_next);
 564                                         p = p.qh->qh_next;
 565                                 }
 566                                 break;
 567                         case Q_TYPE_FSTN:
 568                                 temp = scnprintf (next, size,
 569                                         " fstn-%8x/%p", p.fstn->hw_prev,
 570                                         p.fstn);
 571                                 tag = Q_NEXT_TYPE (p.fstn->hw_next);
 572                                 p = p.fstn->fstn_next;
 573                                 break;
 574                         case Q_TYPE_ITD:
 575                                 temp = scnprintf (next, size,
 576                                         " itd/%p", p.itd);
 577                                 tag = Q_NEXT_TYPE (p.itd->hw_next);
 578                                 p = p.itd->itd_next;
 579                                 break;
 580                         case Q_TYPE_SITD:
 581                                 temp = scnprintf (next, size,
 582                                         " sitd%d-%04x/%p",
 583                                         p.sitd->stream->interval,
 584                                         le32_to_cpup (&p.sitd->hw_uframe)
 585                                                 & 0x0000ffff,
 586                                         p.sitd);
 587                                 tag = Q_NEXT_TYPE (p.sitd->hw_next);
 588                                 p = p.sitd->sitd_next;
 589                                 break;
 590                         }
 591                         size -= temp;
 592                         next += temp;
 593                 } while (p.ptr);
 594
 595                 temp = scnprintf (next, size, "\n");
 596                 size -= temp;
 597                 next += temp;
 598         }
 599         spin_unlock_irqrestore (&ehci->lock, flags);
 600         kfree (seen);
 601
 602         return PAGE_SIZE - size;
 603 }
 604 static CLASS_DEVICE_ATTR (periodic, S_IRUGO, show_periodic, NULL);
 605
 606 #undef DBG_SCHED_LIMIT
 607
 608 static ssize_t
 609 show_registers (struct class_device *class_dev, char *buf)
 610 {
 611         struct usb_bus          *bus;
 612         struct usb_hcd          *hcd;
 613         struct ehci_hcd         *ehci;
 614         unsigned long           flags;
 615         unsigned                temp, size, i;
 616         char                    *next, scratch [80];
 617         static char             fmt [] = "%*s\n";
 618         static char             label [] = "";
 619
 620         bus = to_usb_bus(class_dev);
 621         hcd = bus->hcpriv;
 622         ehci = hcd_to_ehci (hcd);
 623         next = buf;
 624         size = PAGE_SIZE;
 625
 626         spin_lock_irqsave (&ehci->lock, flags);
 627
 628         /* Capability Registers */
 629         i = HC_VERSION(readl (&ehci->caps->hc_capbase));
 630         temp = scnprintf (next, size,
 631                 "bus %s device %s\n"
 632                 "EHCI %x.%02x, hcd state %d (driver " DRIVER_VERSION ")\n",
 633                 hcd->self.controller->bus->name,
 634                 hcd->self.controller->bus_id,
 635                 i >> 8, i & 0x0ff, ehci->hcd.state);
 636         size -= temp;
 637         next += temp;
 638
 639         // FIXME interpret both types of params
 640         i = readl (&ehci->caps->hcs_params);
 641         temp = scnprintf (next, size, "structural params 0x%08x\n", i);
 642         size -= temp;
 643         next += temp;
 644
 645         i = readl (&ehci->caps->hcc_params);
 646         temp = scnprintf (next, size, "capability params 0x%08x\n", i);
 647         size -= temp;
 648         next += temp;
 649
 650         /* Operational Registers */
 651         temp = dbg_status_buf (scratch, sizeof scratch, label,
 652                         readl (&ehci->regs->status));
 653         temp = scnprintf (next, size, fmt, temp, scratch);
 654         size -= temp;
 655         next += temp;
 656
 657         temp = dbg_command_buf (scratch, sizeof scratch, label,
 658                         readl (&ehci->regs->command));
 659         temp = scnprintf (next, size, fmt, temp, scratch);
 660         size -= temp;
 661         next += temp;
 662
 663         temp = dbg_intr_buf (scratch, sizeof scratch, label,
 664                         readl (&ehci->regs->intr_enable));
 665         temp = scnprintf (next, size, fmt, temp, scratch);
 666         size -= temp;
 667         next += temp;
 668
 669         temp = scnprintf (next, size, "uframe %04x\n",
 670                         readl (&ehci->regs->frame_index));
 671         size -= temp;
 672         next += temp;
 673
 674         for (i = 0; i < HCS_N_PORTS (ehci->hcs_params); i++) {
 675                 temp = dbg_port_buf (scratch, sizeof scratch, label, i,
 676                                 readl (&ehci->regs->port_status [i]));
 677                 temp = scnprintf (next, size, fmt, temp, scratch);
 678                 size -= temp;
 679                 next += temp;
 680         }
 681
 682         if (ehci->reclaim) {
 683                 temp = scnprintf (next, size, "reclaim qh %p%s\n",
 684                                 ehci->reclaim,
 685                                 ehci->reclaim_ready ? " ready" : "");
 686                 size -= temp;
 687                 next += temp;
 688         }
 689
 690 #ifdef EHCI_STATS
 691         temp = scnprintf (next, size,
 692                 "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
 693                 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
 694                 ehci->stats.lost_iaa);
 695         size -= temp;
 696         next += temp;
 697
 698         temp = scnprintf (next, size, "complete %ld unlink %ld\n",
 699                 ehci->stats.complete, ehci->stats.unlink);
 700         size -= temp;
 701         next += temp;
 702 #endif
 703
 704         spin_unlock_irqrestore (&ehci->lock, flags);
 705
 706         return PAGE_SIZE - size;
 707 }
 708 static CLASS_DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL);
 709
 710 static inline void create_debug_files (struct ehci_hcd *bus)
 711 {
 712         class_device_create_file(&bus->hcd.self.class_dev, &class_device_attr_async);
 713         class_device_create_file(&bus->hcd.self.class_dev, &class_device_attr_periodic);
 714         class_device_create_file(&bus->hcd.self.class_dev, &class_device_attr_registers);
 715 }
 716
 717 static inline void remove_debug_files (struct ehci_hcd *bus)
 718 {
 719         class_device_remove_file(&bus->hcd.self.class_dev, &class_device_attr_async);
 720         class_device_remove_file(&bus->hcd.self.class_dev, &class_device_attr_periodic);
 721         class_device_remove_file(&bus->hcd.self.class_dev, &class_device_attr_registers);
 722 }
 723
 724 #endif /* STUB_DEBUG_FILES */
 725