target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c

   1 /*
   2  * ADM5120 HCD (Host Controller Driver) for USB
   3  *
   4  * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  * This file was derived from: drivers/usb/host/ohci-dbg.c
   7  *   (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   8  *   (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  *
  14  */
  15
  16 /*-------------------------------------------------------------------------*/
  17
  18 static inline char *ed_typestring(int ed_type)
  19 {
  20         switch (ed_type) {
  21         case PIPE_CONTROL:
  22                 return "ctrl";
  23         case PIPE_BULK:
  24                 return "bulk";
  25         case PIPE_INTERRUPT:
  26                 return "intr";
  27         case PIPE_ISOCHRONOUS:
  28                 return "isoc";
  29         }
  30         return "(bad ed_type)";
  31 }
  32
  33 static inline char *ed_statestring(int state)
  34 {
  35         switch (state) {
  36         case ED_IDLE:
  37                 return "IDLE";
  38         case ED_UNLINK:
  39                 return "UNLINK";
  40         case ED_OPER:
  41                 return "OPER";
  42         }
  43         return "?STATE";
  44 }
  45
  46 static inline char *pipestring(int pipe)
  47 {
  48         return ed_typestring(usb_pipetype(pipe));
  49 }
  50
  51 static inline char *td_pidstring(u32 info)
  52 {
  53         switch (info & TD_DP) {
  54         case TD_DP_SETUP:
  55                 return "SETUP";
  56         case TD_DP_IN:
  57                 return "IN";
  58         case TD_DP_OUT:
  59                 return "OUT";
  60         }
  61         return "?PID";
  62 }
  63
  64 static inline char *td_togglestring(u32 info)
  65 {
  66         switch (info & TD_T) {
  67         case TD_T_DATA0:
  68                 return "DATA0";
  69         case TD_T_DATA1:
  70                 return "DATA1";
  71         case TD_T_CARRY:
  72                 return "CARRY";
  73         }
  74         return "?TOGGLE";
  75 }
  76
  77 /*-------------------------------------------------------------------------*/
  78
  79 #ifdef DEBUG
  80
  81 /* debug| print the main components of an URB
  82  * small: 0) header + data packets 1) just header
  83  */
  84 static void __attribute__((unused))
  85 urb_print(struct admhcd *ahcd, struct urb *urb, char *str, int small, int status)
  86 {
  87         unsigned int pipe = urb->pipe;
  88
  89         if (!urb->dev || !urb->dev->bus) {
  90                 admhc_dbg(ahcd, "%s URB: no dev", str);
  91                 return;
  92         }
  93
  94 #ifndef ADMHC_VERBOSE_DEBUG
  95         if (status != 0)
  96 #endif
  97         admhc_dbg(ahcd, "URB-%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d "
  98                         "stat=%d\n",
  99                         str,
 100                         urb,
 101                         usb_pipedevice (pipe),
 102                         usb_pipeendpoint (pipe),
 103                         usb_pipeout(pipe)? "out" : "in",
 104                         pipestring(pipe),
 105                         urb->transfer_flags,
 106                         urb->actual_length,
 107                         urb->transfer_buffer_length,
 108                         status);
 109
 110 #ifdef  ADMHC_VERBOSE_DEBUG
 111         if (!small) {
 112                 int i, len;
 113
 114                 if (usb_pipecontrol(pipe)) {
 115                         admhc_dbg(ahcd, "setup(8):");
 116                         for (i = 0; i < 8 ; i++)
 117                                 printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
 118                         printk ("\n");
 119                 }
 120                 if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
 121                         admhc_dbg(ahcd, "data(%d/%d):",
 122                                 urb->actual_length,
 123                                 urb->transfer_buffer_length);
 124                         len = usb_pipeout(pipe)?
 125                                                 urb->transfer_buffer_length: urb->actual_length;
 126                         for (i = 0; i < 16 && i < len; i++)
 127                                 printk(" %02x", ((__u8 *)urb->transfer_buffer)[i]);
 128                         printk("%s stat:%d\n", i < len? "...": "", status);
 129                 }
 130         }
 131 #endif /* ADMHC_VERBOSE_DEBUG */
 132 }
 133
 134 #define admhc_dbg_sw(ahcd, next, size, format, arg...) \
 135         do { \
 136         if (next) { \
 137                 unsigned s_len; \
 138                 s_len = scnprintf(*next, *size, format, ## arg ); \
 139                 *size -= s_len; *next += s_len; \
 140         } else \
 141                 admhc_dbg(ahcd,format, ## arg ); \
 142         } while (0);
 143
 144
 145 static void admhc_dump_intr_mask(struct admhcd *ahcd, char *label, u32 mask,
 146                 char **next, unsigned *size)
 147 {
 148         admhc_dbg_sw(ahcd, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n",
 149                 label,
 150                 mask,
 151                 (mask & ADMHC_INTR_INTA) ? " INTA" : "",
 152                 (mask & ADMHC_INTR_FATI) ? " FATI" : "",
 153                 (mask & ADMHC_INTR_SWI) ? " SWI" : "",
 154                 (mask & ADMHC_INTR_TDC) ? " TDC" : "",
 155                 (mask & ADMHC_INTR_FNO) ? " FNO" : "",
 156                 (mask & ADMHC_INTR_SO) ? " SO" : "",
 157                 (mask & ADMHC_INTR_INSM) ? " INSM" : "",
 158                 (mask & ADMHC_INTR_BABI) ? " BABI" : "",
 159                 (mask & ADMHC_INTR_7) ? " !7!" : "",
 160                 (mask & ADMHC_INTR_6) ? " !6!" : "",
 161                 (mask & ADMHC_INTR_RESI) ? " RESI" : "",
 162                 (mask & ADMHC_INTR_SOFI) ? " SOFI" : ""
 163                 );
 164 }
 165
 166 static void maybe_print_eds(struct admhcd *ahcd, char *label, u32 value,
 167                 char **next, unsigned *size)
 168 {
 169         if (value)
 170                 admhc_dbg_sw(ahcd, next, size, "%s %08x\n", label, value);
 171 }
 172
 173 static char *buss2string (int state)
 174 {
 175         switch (state) {
 176         case ADMHC_BUSS_RESET:
 177                 return "reset";
 178         case ADMHC_BUSS_RESUME:
 179                 return "resume";
 180         case ADMHC_BUSS_OPER:
 181                 return "operational";
 182         case ADMHC_BUSS_SUSPEND:
 183                 return "suspend";
 184         }
 185         return "?state";
 186 }
 187
 188 static void
 189 admhc_dump_status(struct admhcd *ahcd, char **next, unsigned *size)
 190 {
 191         struct admhcd_regs __iomem *regs = ahcd->regs;
 192         u32                     temp;
 193
 194         temp = admhc_readl(ahcd, &regs->gencontrol);
 195         admhc_dbg_sw(ahcd, next, size,
 196                 "gencontrol 0x%08x%s%s%s%s\n",
 197                 temp,
 198                 (temp & ADMHC_CTRL_UHFE) ? " UHFE" : "",
 199                 (temp & ADMHC_CTRL_SIR) ? " SIR" : "",
 200                 (temp & ADMHC_CTRL_DMAA) ? " DMAA" : "",
 201                 (temp & ADMHC_CTRL_SR) ? " SR" : ""
 202                 );
 203
 204         temp = admhc_readl(ahcd, &regs->host_control);
 205         admhc_dbg_sw(ahcd, next, size,
 206                 "host_control 0x%08x BUSS=%s%s\n",
 207                 temp,
 208                 buss2string(temp & ADMHC_HC_BUSS),
 209                 (temp & ADMHC_HC_DMAE) ? " DMAE" : ""
 210                 );
 211
 212         admhc_dump_intr_mask(ahcd, "int_status",
 213                         admhc_readl(ahcd, &regs->int_status),
 214                         next, size);
 215         admhc_dump_intr_mask(ahcd, "int_enable",
 216                         admhc_readl(ahcd, &regs->int_enable),
 217                         next, size);
 218
 219         maybe_print_eds(ahcd, "hosthead",
 220                         admhc_readl(ahcd, &regs->hosthead), next, size);
 221 }
 222
 223 #define dbg_port_sw(hc,num,value,next,size) \
 224         admhc_dbg_sw(hc, next, size, \
 225                 "portstatus [%d] " \
 226                 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
 227                 num, temp, \
 228                 (temp & ADMHC_PS_PRSC) ? " PRSC" : "", \
 229                 (temp & ADMHC_PS_OCIC) ? " OCIC" : "", \
 230                 (temp & ADMHC_PS_PSSC) ? " PSSC" : "", \
 231                 (temp & ADMHC_PS_PESC) ? " PESC" : "", \
 232                 (temp & ADMHC_PS_CSC) ? " CSC" : "", \
 233                 \
 234                 (temp & ADMHC_PS_LSDA) ? " LSDA" : "", \
 235                 (temp & ADMHC_PS_PPS) ? " PPS" : "", \
 236                 (temp & ADMHC_PS_PRS) ? " PRS" : "", \
 237                 (temp & ADMHC_PS_POCI) ? " POCI" : "", \
 238                 (temp & ADMHC_PS_PSS) ? " PSS" : "", \
 239                 \
 240                 (temp & ADMHC_PS_PES) ? " PES" : "", \
 241                 (temp & ADMHC_PS_CCS) ? " CCS" : "" \
 242                 );
 243
 244
 245 static void
 246 admhc_dump_roothub(
 247         struct admhcd *ahcd,
 248         int verbose,
 249         char **next,
 250         unsigned *size)
 251 {
 252         u32                     temp, i;
 253
 254         temp = admhc_read_rhdesc(ahcd);
 255         if (temp == ~(u32)0)
 256                 return;
 257
 258         if (verbose) {
 259                 admhc_dbg_sw(ahcd, next, size,
 260                         "rhdesc %08x%s%s%s%s%s%s PPCM=%02x%s%s%s%s NUMP=%d(%d)\n",
 261                         temp,
 262                         (temp & ADMHC_RH_CRWE) ? " CRWE" : "",
 263                         (temp & ADMHC_RH_OCIC) ? " OCIC" : "",
 264                         (temp & ADMHC_RH_LPSC) ? " LPSC" : "",
 265                         (temp & ADMHC_RH_LPSC) ? " DRWE" : "",
 266                         (temp & ADMHC_RH_LPSC) ? " OCI" : "",
 267                         (temp & ADMHC_RH_LPSC) ? " LPS" : "",
 268                         ((temp & ADMHC_RH_PPCM) >> 16),
 269                         (temp & ADMHC_RH_NOCP) ? " NOCP" : "",
 270                         (temp & ADMHC_RH_OCPM) ? " OCPM" : "",
 271                         (temp & ADMHC_RH_NPS) ? " NPS" : "",
 272                         (temp & ADMHC_RH_PSM) ? " PSM" : "",
 273                         (temp & ADMHC_RH_NUMP), ahcd->num_ports
 274                         );
 275         }
 276
 277         for (i = 0; i < ahcd->num_ports; i++) {
 278                 temp = admhc_read_portstatus(ahcd, i);
 279                 dbg_port_sw(ahcd, i, temp, next, size);
 280         }
 281 }
 282
 283 static void admhc_dump(struct admhcd *ahcd, int verbose)
 284 {
 285         admhc_dbg(ahcd, "ADMHC ahcd state\n");
 286
 287         /* dumps some of the state we know about */
 288         admhc_dump_status(ahcd, NULL, NULL);
 289         admhc_dbg(ahcd,"current frame #%04x\n",
 290                 admhc_frame_no(ahcd));
 291
 292         admhc_dump_roothub(ahcd, verbose, NULL, NULL);
 293 }
 294
 295 static const char data0[] = "DATA0";
 296 static const char data1[] = "DATA1";
 297
 298 static void admhc_dump_td(const struct admhcd *ahcd, const char *label,
 299                 const struct td *td)
 300 {
 301         u32     tmp;
 302
 303         admhc_dbg(ahcd, "%s td %p; urb %p index %d; hwNextTD %08x\n",
 304                 label, td,
 305                 td->urb, td->index,
 306                 hc32_to_cpup(ahcd, &td->hwNextTD));
 307
 308         tmp = hc32_to_cpup(ahcd, &td->hwINFO);
 309         admhc_dbg(ahcd, "     status %08x%s CC=%x EC=%d %s %s ISI=%x FN=%x\n",
 310                 tmp,
 311                 (tmp & TD_OWN) ? " OWN" : "",
 312                 TD_CC_GET(tmp),
 313                 TD_EC_GET(tmp),
 314                 td_togglestring(tmp),
 315                 td_pidstring(tmp),
 316                 TD_ISI_GET(tmp),
 317                 TD_FN_GET(tmp));
 318
 319         tmp = hc32_to_cpup(ahcd, &td->hwCBL);
 320         admhc_dbg(ahcd, "     dbp %08x; cbl %08x; LEN=%d%s\n",
 321                 hc32_to_cpup(ahcd, &td->hwDBP),
 322                 tmp,
 323                 TD_BL_GET(tmp),
 324                 (tmp & TD_IE) ? " IE" : "");
 325 }
 326
 327 /* caller MUST own hcd spinlock if verbose is set! */
 328 static void __attribute__((unused))
 329 admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 330                 const struct ed *ed, int verbose)
 331 {
 332         u32 tmp = hc32_to_cpu(ahcd, ed->hwINFO);
 333
 334         admhc_dbg(ahcd, "%s ed %p %s type %s; next ed %08x\n",
 335                 label,
 336                 ed, ed_statestring(ed->state), ed_typestring(ed->type),
 337                 hc32_to_cpup(ahcd, &ed->hwNextED));
 338
 339         admhc_dbg(ahcd, "  info %08x MAX=%d%s%s%s%s EP=%d DEV=%d\n", tmp,
 340                 ED_MPS_GET(tmp),
 341                 (tmp & ED_ISO) ? " ISO" : "",
 342                 (tmp & ED_SKIP) ? " SKIP" : "",
 343                 (tmp & ED_SPEED_FULL) ? " FULL" : " LOW",
 344                 (tmp & ED_INT) ? " INT" : "",
 345                 ED_EN_GET(tmp),
 346                 ED_FA_GET(tmp));
 347
 348         tmp = hc32_to_cpup(ahcd, &ed->hwHeadP);
 349         admhc_dbg(ahcd, "  tds: head %08x tail %08x %s%s%s\n",
 350                 tmp & TD_MASK,
 351                 hc32_to_cpup (ahcd, &ed->hwTailP),
 352                 (tmp & ED_C) ? data1 : data0,
 353                 (tmp & ED_H) ? " HALT" : "",
 354                 verbose ? " td list follows" : " (not listing)");
 355
 356         if (verbose) {
 357                 struct list_head        *tmp;
 358
 359                 /* use ed->td_list because HC concurrently modifies
 360                  * hwNextTD as it accumulates ed_donelist.
 361                  */
 362                 list_for_each(tmp, &ed->td_list) {
 363                         struct td               *td;
 364                         td = list_entry(tmp, struct td, td_list);
 365                         admhc_dump_td (ahcd, "  ->", td);
 366                 }
 367         }
 368 }
 369
 370 #else /* ifdef DEBUG */
 371
 372 static inline void urb_print(struct admhcd *ahcd, struct urb * urb, char * str,
 373         int small) {}
 374 static inline void admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 375         const struct ed *ed, int verbose) {}
 376 static inline void admhc_dump_td(const struct admhcd *ahcd, const char *label,
 377         const struct td *td) {}
 378 static inline void admhc_dump(struct admhcd *ahcd, int verbose) {}
 379
 380 #undef ADMHC_VERBOSE_DEBUG
 381
 382 #endif /* DEBUG */
 383
 384 /*-------------------------------------------------------------------------*/
 385
 386 #ifdef STUB_DEBUG_FILES
 387
 388 static inline void create_debug_files(struct admhcd *bus) { }
 389 static inline void remove_debug_files(struct admhcd *bus) { }
 390
 391 #else
 392
 393 static int debug_async_open(struct inode *, struct file *);
 394 static int debug_periodic_open(struct inode *, struct file *);
 395 static int debug_registers_open(struct inode *, struct file *);
 396 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
 397 static int debug_close(struct inode *, struct file *);
 398
 399 static const struct file_operations debug_async_fops = {
 400         .owner          = THIS_MODULE,
 401         .open           = debug_async_open,
 402         .read           = debug_output,
 403         .release        = debug_close,
 404 };
 405 static const struct file_operations debug_periodic_fops = {
 406         .owner          = THIS_MODULE,
 407         .open           = debug_periodic_open,
 408         .read           = debug_output,
 409         .release        = debug_close,
 410 };
 411 static const struct file_operations debug_registers_fops = {
 412         .owner          = THIS_MODULE,
 413         .open           = debug_registers_open,
 414         .read           = debug_output,
 415         .release        = debug_close,
 416 };
 417
 418 static struct dentry *admhc_debug_root;
 419
 420 struct debug_buffer {
 421         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
 422         struct device *dev;
 423         struct mutex mutex;     /* protect filling of buffer */
 424         size_t count;           /* number of characters filled into buffer */
 425         char *page;
 426 };
 427
 428 static ssize_t
 429 show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 430 {
 431         unsigned temp;
 432         unsigned size = count;
 433
 434         if (!ed)
 435                 return 0;
 436
 437         /* dump a snapshot of the bulk or control schedule */
 438         while (ed) {
 439                 u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
 440                 u32 headp = hc32_to_cpu(ahcd, ed->hwHeadP);
 441                 u32 tailp = hc32_to_cpu(ahcd, ed->hwTailP);
 442                 struct list_head *entry;
 443                 struct td       *td;
 444
 445                 temp = scnprintf(buf, size,
 446                         "ed/%p %s %s %cs dev%d ep%d %s%smax %d %08x%s%s %s"
 447                         " h:%08x t:%08x",
 448                         ed,
 449                         ed_statestring(ed->state),
 450                         ed_typestring (ed->type),
 451                         (info & ED_SPEED_FULL) ? 'f' : 'l',
 452                         info & ED_FA_MASK,
 453                         (info >> ED_EN_SHIFT) & ED_EN_MASK,
 454                         (info & ED_INT) ? "INT " : "",
 455                         (info & ED_ISO) ? "ISO " : "",
 456                         (info >> ED_MPS_SHIFT) & ED_MPS_MASK ,
 457                         info,
 458                         (info & ED_SKIP) ? " S" : "",
 459                         (headp & ED_H) ? " H" : "",
 460                         (headp & ED_C) ? data1 : data0,
 461                         headp & ED_MASK,tailp);
 462                 size -= temp;
 463                 buf += temp;
 464
 465                 list_for_each(entry, &ed->td_list) {
 466                         u32             dbp, cbl;
 467
 468                         td = list_entry(entry, struct td, td_list);
 469                         info = hc32_to_cpup (ahcd, &td->hwINFO);
 470                         dbp = hc32_to_cpup (ahcd, &td->hwDBP);
 471                         cbl = hc32_to_cpup (ahcd, &td->hwCBL);
 472
 473                         temp = scnprintf(buf, size,
 474                                 "\n\ttd/%p %s %d %s%scc=%x urb %p (%08x,%08x)",
 475                                 td,
 476                                 td_pidstring(info),
 477                                 TD_BL_GET(cbl),
 478                                 (info & TD_OWN) ? "" : "DONE ",
 479                                 (cbl & TD_IE) ? "IE " : "",
 480                                 TD_CC_GET (info), td->urb, info, cbl);
 481                         size -= temp;
 482                         buf += temp;
 483                 }
 484
 485                 temp = scnprintf(buf, size, "\n");
 486                 size -= temp;
 487                 buf += temp;
 488
 489                 ed = ed->ed_next;
 490         }
 491
 492         return count - size;
 493 }
 494
 495 static ssize_t fill_async_buffer(struct debug_buffer *buf)
 496 {
 497         struct usb_bus          *bus;
 498         struct usb_hcd          *hcd;
 499         struct admhcd           *ahcd;
 500         size_t                  temp;
 501         unsigned long           flags;
 502
 503         bus = dev_get_drvdata(buf->dev);
 504         hcd = bus_to_hcd(bus);
 505         ahcd = hcd_to_admhcd(hcd);
 506
 507         spin_lock_irqsave(&ahcd->lock, flags);
 508         temp = show_list(ahcd, buf->page, PAGE_SIZE, ahcd->ed_head);
 509         spin_unlock_irqrestore(&ahcd->lock, flags);
 510
 511         return temp;
 512 }
 513
 514
 515 #define DBG_SCHED_LIMIT 64
 516
 517 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 518 {
 519         struct usb_bus          *bus;
 520         struct usb_hcd          *hcd;
 521         struct admhcd           *ahcd;
 522         struct ed               **seen, *ed;
 523         unsigned long           flags;
 524         unsigned                temp, size, seen_count;
 525         char                    *next;
 526         unsigned                i;
 527
 528         if (!(seen = kmalloc(DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
 529                 return 0;
 530         seen_count = 0;
 531
 532         bus = dev_get_drvdata(buf->dev);
 533         hcd = bus_to_hcd(bus);
 534         ahcd = hcd_to_admhcd(hcd);
 535         next = buf->page;
 536         size = PAGE_SIZE;
 537
 538         temp = scnprintf(next, size, "size = %d\n", NUM_INTS);
 539         size -= temp;
 540         next += temp;
 541
 542         /* dump a snapshot of the periodic schedule (and load) */
 543         spin_lock_irqsave(&ahcd->lock, flags);
 544         for (i = 0; i < NUM_INTS; i++) {
 545                 if (!(ed = ahcd->periodic [i]))
 546                         continue;
 547
 548                 temp = scnprintf(next, size, "%2d [%3d]:", i, ahcd->load [i]);
 549                 size -= temp;
 550                 next += temp;
 551
 552                 do {
 553                         temp = scnprintf(next, size, " ed%d/%p",
 554                                 ed->interval, ed);
 555                         size -= temp;
 556                         next += temp;
 557                         for (temp = 0; temp < seen_count; temp++) {
 558                                 if (seen [temp] == ed)
 559                                         break;
 560                         }
 561
 562                         /* show more info the first time around */
 563                         if (temp == seen_count) {
 564                                 u32     info = hc32_to_cpu (ahcd, ed->hwINFO);
 565                                 struct list_head        *entry;
 566                                 unsigned                qlen = 0;
 567
 568                                 /* qlen measured here in TDs, not urbs */
 569                                 list_for_each (entry, &ed->td_list)
 570                                         qlen++;
 571                                 temp = scnprintf(next, size,
 572                                         " (%cs dev%d ep%d%s qlen %u"
 573                                         " max %d %08x%s%s)",
 574                                         (info & ED_SPEED_FULL) ? 'f' : 'l',
 575                                         ED_FA_GET(info),
 576                                         ED_EN_GET(info),
 577                                         (info & ED_ISO) ? "iso" : "int",
 578                                         qlen,
 579                                         ED_MPS_GET(info),
 580                                         info,
 581                                         (info & ED_SKIP) ? " K" : "",
 582                                         (ed->hwHeadP &
 583                                                 cpu_to_hc32(ahcd, ED_H)) ?
 584                                                         " H" : "");
 585                                 size -= temp;
 586                                 next += temp;
 587
 588                                 if (seen_count < DBG_SCHED_LIMIT)
 589                                         seen [seen_count++] = ed;
 590
 591                                 ed = ed->ed_next;
 592
 593                         } else {
 594                                 /* we've seen it and what's after */
 595                                 temp = 0;
 596                                 ed = NULL;
 597                         }
 598
 599                 } while (ed);
 600
 601                 temp = scnprintf(next, size, "\n");
 602                 size -= temp;
 603                 next += temp;
 604         }
 605         spin_unlock_irqrestore(&ahcd->lock, flags);
 606         kfree (seen);
 607
 608         return PAGE_SIZE - size;
 609 }
 610
 611
 612 #undef DBG_SCHED_LIMIT
 613
 614 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 615 {
 616         struct usb_bus          *bus;
 617         struct usb_hcd          *hcd;
 618         struct admhcd           *ahcd;
 619         struct admhcd_regs __iomem *regs;
 620         unsigned long           flags;
 621         unsigned                temp, size;
 622         char                    *next;
 623         u32                     rdata;
 624
 625         bus = dev_get_drvdata(buf->dev);
 626         hcd = bus_to_hcd(bus);
 627         ahcd = hcd_to_admhcd(hcd);
 628         regs = ahcd->regs;
 629         next = buf->page;
 630         size = PAGE_SIZE;
 631
 632         spin_lock_irqsave(&ahcd->lock, flags);
 633
 634         /* dump driver info, then registers in spec order */
 635
 636         admhc_dbg_sw(ahcd, &next, &size,
 637                 "bus %s, device %s\n"
 638                 "%s\n"
 639                 "%s version " DRIVER_VERSION "\n",
 640                 hcd->self.controller->bus->name,
 641                 hcd->self.controller->bus_id,
 642                 hcd->product_desc,
 643                 hcd_name);
 644
 645         if (bus->controller->power.power_state.event) {
 646                 size -= scnprintf(next, size,
 647                         "SUSPENDED (no register access)\n");
 648                 goto done;
 649         }
 650
 651         admhc_dump_status(ahcd, &next, &size);
 652
 653         /* other registers mostly affect frame timings */
 654         rdata = admhc_readl(ahcd, &regs->fminterval);
 655         temp = scnprintf(next, size,
 656                         "fmintvl 0x%08x %sFSLDP=0x%04x FI=0x%04x\n",
 657                         rdata, (rdata & ADMHC_SFI_FIT) ? "FIT " : "",
 658                         (rdata >> ADMHC_SFI_FSLDP_SHIFT) & ADMHC_SFI_FSLDP_MASK,
 659                         rdata  & ADMHC_SFI_FI_MASK);
 660         size -= temp;
 661         next += temp;
 662
 663         rdata = admhc_readl(ahcd, &regs->fmnumber);
 664         temp = scnprintf(next, size, "fmnumber 0x%08x %sFR=0x%04x FN=%04x\n",
 665                         rdata, (rdata & ADMHC_SFN_FRT) ? "FRT " : "",
 666                         (rdata >> ADMHC_SFN_FR_SHIFT) & ADMHC_SFN_FR_MASK,
 667                         rdata  & ADMHC_SFN_FN_MASK);
 668         size -= temp;
 669         next += temp;
 670
 671         /* TODO: use predefined bitmask */
 672         rdata = admhc_readl(ahcd, &regs->lsthresh);
 673         temp = scnprintf(next, size, "lsthresh 0x%04x\n",
 674                         rdata & 0x3fff);
 675         size -= temp;
 676         next += temp;
 677
 678         temp = scnprintf(next, size, "hub poll timer: %s\n",
 679                         admhcd_to_hcd(ahcd)->poll_rh ? "ON" : "OFF");
 680         size -= temp;
 681         next += temp;
 682
 683         /* roothub */
 684         admhc_dump_roothub(ahcd, 1, &next, &size);
 685
 686 done:
 687         spin_unlock_irqrestore(&ahcd->lock, flags);
 688         return PAGE_SIZE - size;
 689 }
 690
 691
 692 static struct debug_buffer *alloc_buffer(struct device *dev,
 693                                 ssize_t (*fill_func)(struct debug_buffer *))
 694 {
 695         struct debug_buffer *buf;
 696
 697         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 698
 699         if (buf) {
 700                 buf->dev = dev;
 701                 buf->fill_func = fill_func;
 702                 mutex_init(&buf->mutex);
 703         }
 704
 705         return buf;
 706 }
 707
 708 static int fill_buffer(struct debug_buffer *buf)
 709 {
 710         int ret = 0;
 711
 712         if (!buf->page)
 713                 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
 714
 715         if (!buf->page) {
 716                 ret = -ENOMEM;
 717                 goto out;
 718         }
 719
 720         ret = buf->fill_func(buf);
 721
 722         if (ret >= 0) {
 723                 buf->count = ret;
 724                 ret = 0;
 725         }
 726
 727 out:
 728         return ret;
 729 }
 730
 731 static ssize_t debug_output(struct file *file, char __user *user_buf,
 732                         size_t len, loff_t *offset)
 733 {
 734         struct debug_buffer *buf = file->private_data;
 735         int ret = 0;
 736
 737         mutex_lock(&buf->mutex);
 738         if (buf->count == 0) {
 739                 ret = fill_buffer(buf);
 740                 if (ret != 0) {
 741                         mutex_unlock(&buf->mutex);
 742                         goto out;
 743                 }
 744         }
 745         mutex_unlock(&buf->mutex);
 746
 747         ret = simple_read_from_buffer(user_buf, len, offset,
 748                                         buf->page, buf->count);
 749
 750 out:
 751         return ret;
 752 }
 753
 754 static int debug_close(struct inode *inode, struct file *file)
 755 {
 756         struct debug_buffer *buf = file->private_data;
 757
 758         if (buf) {
 759                 if (buf->page)
 760                         free_page((unsigned long)buf->page);
 761                 kfree(buf);
 762         }
 763
 764         return 0;
 765 }
 766
 767 static int debug_async_open(struct inode *inode, struct file *file)
 768 {
 769         file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
 770
 771         return file->private_data ? 0 : -ENOMEM;
 772 }
 773
 774 static int debug_periodic_open(struct inode *inode, struct file *file)
 775 {
 776         file->private_data = alloc_buffer(inode->i_private,
 777                                                 fill_periodic_buffer);
 778
 779         return file->private_data ? 0 : -ENOMEM;
 780 }
 781
 782 static int debug_registers_open(struct inode *inode, struct file *file)
 783 {
 784         file->private_data = alloc_buffer(inode->i_private,
 785                                                 fill_registers_buffer);
 786
 787         return file->private_data ? 0 : -ENOMEM;
 788 }
 789
 790 static inline void create_debug_files(struct admhcd *ahcd)
 791 {
 792         struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
 793         struct device *dev = bus->dev;
 794
 795         ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
 796         if (!ahcd->debug_dir)
 797                 goto dir_error;
 798
 799         ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
 800                                                 ahcd->debug_dir, dev,
 801                                                 &debug_async_fops);
 802         if (!ahcd->debug_async)
 803                 goto async_error;
 804
 805         ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
 806                                                 ahcd->debug_dir, dev,
 807                                                 &debug_periodic_fops);
 808         if (!ahcd->debug_periodic)
 809                 goto periodic_error;
 810
 811         ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
 812                                                 ahcd->debug_dir, dev,
 813                                                 &debug_registers_fops);
 814         if (!ahcd->debug_registers)
 815                 goto registers_error;
 816
 817         admhc_dbg(ahcd, "created debug files\n");
 818         return;
 819
 820 registers_error:
 821         debugfs_remove(ahcd->debug_periodic);
 822 periodic_error:
 823         debugfs_remove(ahcd->debug_async);
 824 async_error:
 825         debugfs_remove(ahcd->debug_dir);
 826 dir_error:
 827         ahcd->debug_periodic = NULL;
 828         ahcd->debug_async = NULL;
 829         ahcd->debug_dir = NULL;
 830 }
 831
 832 static inline void remove_debug_files(struct admhcd *ahcd)
 833 {
 834         debugfs_remove(ahcd->debug_registers);
 835         debugfs_remove(ahcd->debug_periodic);
 836         debugfs_remove(ahcd->debug_async);
 837         debugfs_remove(ahcd->debug_dir);
 838 }
 839
 840 #endif
 841
 842 /*-------------------------------------------------------------------------*/