1 // SPDX-License-Identifier: GPL-1.0+ 2 /* 3 * OHCI HCD (Host Controller Driver) for USB. 4 * 5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 6 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> 7 * 8 * This file is licenced under the GPL. 9 */ 10 11 /*-------------------------------------------------------------------------*/ 12 13 #define edstring(ed_type) ({ char *temp; \ 14 switch (ed_type) { \ 15 case PIPE_CONTROL: temp = "ctrl"; break; \ 16 case PIPE_BULK: temp = "bulk"; break; \ 17 case PIPE_INTERRUPT: temp = "intr"; break; \ 18 default: temp = "isoc"; break; \ 19 } temp;}) 20 #define pipestring(pipe) edstring(usb_pipetype(pipe)) 21 22 23 #define ohci_dbg_sw(ohci, next, size, format, arg...) \ 24 do { \ 25 if (next != NULL) { \ 26 unsigned s_len; \ 27 s_len = scnprintf (*next, *size, format, ## arg ); \ 28 *size -= s_len; *next += s_len; \ 29 } else \ 30 ohci_dbg(ohci,format, ## arg ); \ 31 } while (0); 32 33 /* Version for use where "next" is the address of a local variable */ 34 #define ohci_dbg_nosw(ohci, next, size, format, arg...) \ 35 do { \ 36 unsigned s_len; \ 37 s_len = scnprintf(*next, *size, format, ## arg); \ 38 *size -= s_len; *next += s_len; \ 39 } while (0); 40 41 42 static void ohci_dump_intr_mask ( 43 struct ohci_hcd *ohci, 44 char *label, 45 u32 mask, 46 char **next, 47 unsigned *size) 48 { 49 ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n", 50 label, 51 mask, 52 (mask & OHCI_INTR_MIE) ? " MIE" : "", 53 (mask & OHCI_INTR_OC) ? " OC" : "", 54 (mask & OHCI_INTR_RHSC) ? " RHSC" : "", 55 (mask & OHCI_INTR_FNO) ? " FNO" : "", 56 (mask & OHCI_INTR_UE) ? " UE" : "", 57 (mask & OHCI_INTR_RD) ? " RD" : "", 58 (mask & OHCI_INTR_SF) ? " SF" : "", 59 (mask & OHCI_INTR_WDH) ? " WDH" : "", 60 (mask & OHCI_INTR_SO) ? " SO" : "" 61 ); 62 } 63 64 static void maybe_print_eds ( 65 struct ohci_hcd *ohci, 66 char *label, 67 u32 value, 68 char **next, 69 unsigned *size) 70 { 71 if (value) 72 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value); 73 } 74 75 static char *hcfs2string (int state) 76 { 77 switch (state) { 78 case OHCI_USB_RESET: return "reset"; 79 case OHCI_USB_RESUME: return "resume"; 80 case OHCI_USB_OPER: return "operational"; 81 case OHCI_USB_SUSPEND: return "suspend"; 82 } 83 return "?"; 84 } 85 86 static const char *rh_state_string(struct ohci_hcd *ohci) 87 { 88 switch (ohci->rh_state) { 89 case OHCI_RH_HALTED: 90 return "halted"; 91 case OHCI_RH_SUSPENDED: 92 return "suspended"; 93 case OHCI_RH_RUNNING: 94 return "running"; 95 } 96 return "?"; 97 } 98 99 // dump control and status registers 100 static void 101 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size) 102 { 103 struct ohci_regs __iomem *regs = controller->regs; 104 u32 temp; 105 106 temp = ohci_readl (controller, ®s->revision) & 0xff; 107 ohci_dbg_sw (controller, next, size, 108 "OHCI %d.%d, %s legacy support registers, rh state %s\n", 109 0x03 & (temp >> 4), (temp & 0x0f), 110 (temp & 0x0100) ? "with" : "NO", 111 rh_state_string(controller)); 112 113 temp = ohci_readl (controller, ®s->control); 114 ohci_dbg_sw (controller, next, size, 115 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n", 116 temp, 117 (temp & OHCI_CTRL_RWE) ? " RWE" : "", 118 (temp & OHCI_CTRL_RWC) ? " RWC" : "", 119 (temp & OHCI_CTRL_IR) ? " IR" : "", 120 hcfs2string (temp & OHCI_CTRL_HCFS), 121 (temp & OHCI_CTRL_BLE) ? " BLE" : "", 122 (temp & OHCI_CTRL_CLE) ? " CLE" : "", 123 (temp & OHCI_CTRL_IE) ? " IE" : "", 124 (temp & OHCI_CTRL_PLE) ? " PLE" : "", 125 temp & OHCI_CTRL_CBSR 126 ); 127 128 temp = ohci_readl (controller, ®s->cmdstatus); 129 ohci_dbg_sw (controller, next, size, 130 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp, 131 (temp & OHCI_SOC) >> 16, 132 (temp & OHCI_OCR) ? " OCR" : "", 133 (temp & OHCI_BLF) ? " BLF" : "", 134 (temp & OHCI_CLF) ? " CLF" : "", 135 (temp & OHCI_HCR) ? " HCR" : "" 136 ); 137 138 ohci_dump_intr_mask (controller, "intrstatus", 139 ohci_readl (controller, ®s->intrstatus), 140 next, size); 141 ohci_dump_intr_mask (controller, "intrenable", 142 ohci_readl (controller, ®s->intrenable), 143 next, size); 144 // intrdisable always same as intrenable 145 146 maybe_print_eds (controller, "ed_periodcurrent", 147 ohci_readl (controller, ®s->ed_periodcurrent), 148 next, size); 149 150 maybe_print_eds (controller, "ed_controlhead", 151 ohci_readl (controller, ®s->ed_controlhead), 152 next, size); 153 maybe_print_eds (controller, "ed_controlcurrent", 154 ohci_readl (controller, ®s->ed_controlcurrent), 155 next, size); 156 157 maybe_print_eds (controller, "ed_bulkhead", 158 ohci_readl (controller, ®s->ed_bulkhead), 159 next, size); 160 maybe_print_eds (controller, "ed_bulkcurrent", 161 ohci_readl (controller, ®s->ed_bulkcurrent), 162 next, size); 163 164 maybe_print_eds (controller, "donehead", 165 ohci_readl (controller, ®s->donehead), next, size); 166 } 167 168 #define dbg_port_sw(hc,num,value,next,size) \ 169 ohci_dbg_sw (hc, next, size, \ 170 "roothub.portstatus [%d] " \ 171 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \ 172 num, temp, \ 173 (temp & RH_PS_PRSC) ? " PRSC" : "", \ 174 (temp & RH_PS_OCIC) ? " OCIC" : "", \ 175 (temp & RH_PS_PSSC) ? " PSSC" : "", \ 176 (temp & RH_PS_PESC) ? " PESC" : "", \ 177 (temp & RH_PS_CSC) ? " CSC" : "", \ 178 \ 179 (temp & RH_PS_LSDA) ? " LSDA" : "", \ 180 (temp & RH_PS_PPS) ? " PPS" : "", \ 181 (temp & RH_PS_PRS) ? " PRS" : "", \ 182 (temp & RH_PS_POCI) ? " POCI" : "", \ 183 (temp & RH_PS_PSS) ? " PSS" : "", \ 184 \ 185 (temp & RH_PS_PES) ? " PES" : "", \ 186 (temp & RH_PS_CCS) ? " CCS" : "" \ 187 ); 188 189 190 static void 191 ohci_dump_roothub ( 192 struct ohci_hcd *controller, 193 int verbose, 194 char **next, 195 unsigned *size) 196 { 197 u32 temp, i; 198 199 temp = roothub_a (controller); 200 if (temp == ~(u32)0) 201 return; 202 203 if (verbose) { 204 ohci_dbg_sw (controller, next, size, 205 "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp, 206 ((temp & RH_A_POTPGT) >> 24) & 0xff, 207 (temp & RH_A_NOCP) ? " NOCP" : "", 208 (temp & RH_A_OCPM) ? " OCPM" : "", 209 (temp & RH_A_DT) ? " DT" : "", 210 (temp & RH_A_NPS) ? " NPS" : "", 211 (temp & RH_A_PSM) ? " PSM" : "", 212 (temp & RH_A_NDP), controller->num_ports 213 ); 214 temp = roothub_b (controller); 215 ohci_dbg_sw (controller, next, size, 216 "roothub.b %08x PPCM=%04x DR=%04x\n", 217 temp, 218 (temp & RH_B_PPCM) >> 16, 219 (temp & RH_B_DR) 220 ); 221 temp = roothub_status (controller); 222 ohci_dbg_sw (controller, next, size, 223 "roothub.status %08x%s%s%s%s%s%s\n", 224 temp, 225 (temp & RH_HS_CRWE) ? " CRWE" : "", 226 (temp & RH_HS_OCIC) ? " OCIC" : "", 227 (temp & RH_HS_LPSC) ? " LPSC" : "", 228 (temp & RH_HS_DRWE) ? " DRWE" : "", 229 (temp & RH_HS_OCI) ? " OCI" : "", 230 (temp & RH_HS_LPS) ? " LPS" : "" 231 ); 232 } 233 234 for (i = 0; i < controller->num_ports; i++) { 235 temp = roothub_portstatus (controller, i); 236 dbg_port_sw (controller, i, temp, next, size); 237 } 238 } 239 240 static void ohci_dump(struct ohci_hcd *controller) 241 { 242 ohci_dbg (controller, "OHCI controller state\n"); 243 244 // dumps some of the state we know about 245 ohci_dump_status (controller, NULL, NULL); 246 if (controller->hcca) 247 ohci_dbg (controller, 248 "hcca frame #%04x\n", ohci_frame_no(controller)); 249 ohci_dump_roothub (controller, 1, NULL, NULL); 250 } 251 252 static const char data0 [] = "DATA0"; 253 static const char data1 [] = "DATA1"; 254 255 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label, 256 const struct td *td) 257 { 258 u32 tmp = hc32_to_cpup (ohci, &td->hwINFO); 259 260 ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n", 261 label, td, 262 (tmp & TD_DONE) ? " (DONE)" : "", 263 td->urb, td->index, 264 hc32_to_cpup (ohci, &td->hwNextTD)); 265 if ((tmp & TD_ISO) == 0) { 266 const char *toggle, *pid; 267 u32 cbp, be; 268 269 switch (tmp & TD_T) { 270 case TD_T_DATA0: toggle = data0; break; 271 case TD_T_DATA1: toggle = data1; break; 272 case TD_T_TOGGLE: toggle = "(CARRY)"; break; 273 default: toggle = "(?)"; break; 274 } 275 switch (tmp & TD_DP) { 276 case TD_DP_SETUP: pid = "SETUP"; break; 277 case TD_DP_IN: pid = "IN"; break; 278 case TD_DP_OUT: pid = "OUT"; break; 279 default: pid = "(bad pid)"; break; 280 } 281 ohci_dbg (ohci, " info %08x CC=%x %s DI=%d %s %s\n", tmp, 282 TD_CC_GET(tmp), /* EC, */ toggle, 283 (tmp & TD_DI) >> 21, pid, 284 (tmp & TD_R) ? "R" : ""); 285 cbp = hc32_to_cpup (ohci, &td->hwCBP); 286 be = hc32_to_cpup (ohci, &td->hwBE); 287 ohci_dbg (ohci, " cbp %08x be %08x (len %d)\n", cbp, be, 288 cbp ? (be + 1 - cbp) : 0); 289 } else { 290 unsigned i; 291 ohci_dbg (ohci, " info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp, 292 TD_CC_GET(tmp), 293 (tmp >> 24) & 0x07, 294 (tmp & TD_DI) >> 21, 295 tmp & 0x0000ffff); 296 ohci_dbg (ohci, " bp0 %08x be %08x\n", 297 hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff, 298 hc32_to_cpup (ohci, &td->hwBE)); 299 for (i = 0; i < MAXPSW; i++) { 300 u16 psw = ohci_hwPSW (ohci, td, i); 301 int cc = (psw >> 12) & 0x0f; 302 ohci_dbg (ohci, " psw [%d] = %2x, CC=%x %s=%d\n", i, 303 psw, cc, 304 (cc >= 0x0e) ? "OFFSET" : "SIZE", 305 psw & 0x0fff); 306 } 307 } 308 } 309 310 /* caller MUST own hcd spinlock if verbose is set! */ 311 static void __maybe_unused 312 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label, 313 const struct ed *ed, int verbose) 314 { 315 u32 tmp = hc32_to_cpu (ohci, ed->hwINFO); 316 char *type = ""; 317 318 ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n", 319 label, 320 ed, ed->state, edstring (ed->type), 321 hc32_to_cpup (ohci, &ed->hwNextED)); 322 switch (tmp & (ED_IN|ED_OUT)) { 323 case ED_OUT: type = "-OUT"; break; 324 case ED_IN: type = "-IN"; break; 325 /* else from TDs ... control */ 326 } 327 ohci_dbg (ohci, 328 " info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp, 329 0x03ff & (tmp >> 16), 330 (tmp & ED_DEQUEUE) ? " DQ" : "", 331 (tmp & ED_ISO) ? " ISO" : "", 332 (tmp & ED_SKIP) ? " SKIP" : "", 333 (tmp & ED_LOWSPEED) ? " LOW" : "", 334 0x000f & (tmp >> 7), 335 type, 336 0x007f & tmp); 337 tmp = hc32_to_cpup (ohci, &ed->hwHeadP); 338 ohci_dbg (ohci, " tds: head %08x %s%s tail %08x%s\n", 339 tmp, 340 (tmp & ED_C) ? data1 : data0, 341 (tmp & ED_H) ? " HALT" : "", 342 hc32_to_cpup (ohci, &ed->hwTailP), 343 verbose ? "" : " (not listing)"); 344 if (verbose) { 345 struct list_head *tmp; 346 347 /* use ed->td_list because HC concurrently modifies 348 * hwNextTD as it accumulates ed_donelist. 349 */ 350 list_for_each (tmp, &ed->td_list) { 351 struct td *td; 352 td = list_entry (tmp, struct td, td_list); 353 ohci_dump_td (ohci, " ->", td); 354 } 355 } 356 } 357 358 /*-------------------------------------------------------------------------*/ 359 360 static int debug_async_open(struct inode *, struct file *); 361 static int debug_periodic_open(struct inode *, struct file *); 362 static int debug_registers_open(struct inode *, struct file *); 363 static int debug_async_open(struct inode *, struct file *); 364 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*); 365 static int debug_close(struct inode *, struct file *); 366 367 static const struct file_operations debug_async_fops = { 368 .owner = THIS_MODULE, 369 .open = debug_async_open, 370 .read = debug_output, 371 .release = debug_close, 372 .llseek = default_llseek, 373 }; 374 static const struct file_operations debug_periodic_fops = { 375 .owner = THIS_MODULE, 376 .open = debug_periodic_open, 377 .read = debug_output, 378 .release = debug_close, 379 .llseek = default_llseek, 380 }; 381 static const struct file_operations debug_registers_fops = { 382 .owner = THIS_MODULE, 383 .open = debug_registers_open, 384 .read = debug_output, 385 .release = debug_close, 386 .llseek = default_llseek, 387 }; 388 389 static struct dentry *ohci_debug_root; 390 391 struct debug_buffer { 392 ssize_t (*fill_func)(struct debug_buffer *); /* fill method */ 393 struct ohci_hcd *ohci; 394 struct mutex mutex; /* protect filling of buffer */ 395 size_t count; /* number of characters filled into buffer */ 396 char *page; 397 }; 398 399 static ssize_t 400 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed) 401 { 402 unsigned temp, size = count; 403 404 if (!ed) 405 return 0; 406 407 /* print first --> last */ 408 while (ed->ed_prev) 409 ed = ed->ed_prev; 410 411 /* dump a snapshot of the bulk or control schedule */ 412 while (ed) { 413 u32 info = hc32_to_cpu (ohci, ed->hwINFO); 414 u32 headp = hc32_to_cpu (ohci, ed->hwHeadP); 415 struct list_head *entry; 416 struct td *td; 417 418 temp = scnprintf (buf, size, 419 "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s", 420 ed, 421 (info & ED_LOWSPEED) ? 'l' : 'f', 422 info & 0x7f, 423 (info >> 7) & 0xf, 424 (info & ED_IN) ? "in" : "out", 425 0x03ff & (info >> 16), 426 info, 427 (info & ED_SKIP) ? " s" : "", 428 (headp & ED_H) ? " H" : "", 429 (headp & ED_C) ? data1 : data0); 430 size -= temp; 431 buf += temp; 432 433 list_for_each (entry, &ed->td_list) { 434 u32 cbp, be; 435 436 td = list_entry (entry, struct td, td_list); 437 info = hc32_to_cpup (ohci, &td->hwINFO); 438 cbp = hc32_to_cpup (ohci, &td->hwCBP); 439 be = hc32_to_cpup (ohci, &td->hwBE); 440 temp = scnprintf (buf, size, 441 "\n\ttd %p %s %d cc=%x urb %p (%08x)", 442 td, 443 ({ char *pid; 444 switch (info & TD_DP) { 445 case TD_DP_SETUP: pid = "setup"; break; 446 case TD_DP_IN: pid = "in"; break; 447 case TD_DP_OUT: pid = "out"; break; 448 default: pid = "(?)"; break; 449 } pid;}), 450 cbp ? (be + 1 - cbp) : 0, 451 TD_CC_GET (info), td->urb, info); 452 size -= temp; 453 buf += temp; 454 } 455 456 temp = scnprintf (buf, size, "\n"); 457 size -= temp; 458 buf += temp; 459 460 ed = ed->ed_next; 461 } 462 return count - size; 463 } 464 465 static ssize_t fill_async_buffer(struct debug_buffer *buf) 466 { 467 struct ohci_hcd *ohci; 468 size_t temp, size; 469 unsigned long flags; 470 471 ohci = buf->ohci; 472 size = PAGE_SIZE; 473 474 /* display control and bulk lists together, for simplicity */ 475 spin_lock_irqsave (&ohci->lock, flags); 476 temp = show_list(ohci, buf->page, size, ohci->ed_controltail); 477 temp += show_list(ohci, buf->page + temp, size - temp, 478 ohci->ed_bulktail); 479 spin_unlock_irqrestore (&ohci->lock, flags); 480 481 return temp; 482 } 483 484 #define DBG_SCHED_LIMIT 64 485 486 static ssize_t fill_periodic_buffer(struct debug_buffer *buf) 487 { 488 struct ohci_hcd *ohci; 489 struct ed **seen, *ed; 490 unsigned long flags; 491 unsigned temp, size, seen_count; 492 char *next; 493 unsigned i; 494 495 seen = kmalloc_array(DBG_SCHED_LIMIT, sizeof(*seen), GFP_ATOMIC); 496 if (!seen) 497 return 0; 498 seen_count = 0; 499 500 ohci = buf->ohci; 501 next = buf->page; 502 size = PAGE_SIZE; 503 504 temp = scnprintf (next, size, "size = %d\n", NUM_INTS); 505 size -= temp; 506 next += temp; 507 508 /* dump a snapshot of the periodic schedule (and load) */ 509 spin_lock_irqsave (&ohci->lock, flags); 510 for (i = 0; i < NUM_INTS; i++) { 511 ed = ohci->periodic[i]; 512 if (!ed) 513 continue; 514 515 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]); 516 size -= temp; 517 next += temp; 518 519 do { 520 temp = scnprintf (next, size, " ed%d/%p", 521 ed->interval, ed); 522 size -= temp; 523 next += temp; 524 for (temp = 0; temp < seen_count; temp++) { 525 if (seen [temp] == ed) 526 break; 527 } 528 529 /* show more info the first time around */ 530 if (temp == seen_count) { 531 u32 info = hc32_to_cpu (ohci, ed->hwINFO); 532 struct list_head *entry; 533 unsigned qlen = 0; 534 535 /* qlen measured here in TDs, not urbs */ 536 list_for_each (entry, &ed->td_list) 537 qlen++; 538 539 temp = scnprintf (next, size, 540 " (%cs dev%d ep%d%s-%s qlen %u" 541 " max %d %08x%s%s)", 542 (info & ED_LOWSPEED) ? 'l' : 'f', 543 info & 0x7f, 544 (info >> 7) & 0xf, 545 (info & ED_IN) ? "in" : "out", 546 (info & ED_ISO) ? "iso" : "int", 547 qlen, 548 0x03ff & (info >> 16), 549 info, 550 (info & ED_SKIP) ? " K" : "", 551 (ed->hwHeadP & 552 cpu_to_hc32(ohci, ED_H)) ? 553 " H" : ""); 554 size -= temp; 555 next += temp; 556 557 if (seen_count < DBG_SCHED_LIMIT) 558 seen [seen_count++] = ed; 559 560 ed = ed->ed_next; 561 562 } else { 563 /* we've seen it and what's after */ 564 temp = 0; 565 ed = NULL; 566 } 567 568 } while (ed); 569 570 temp = scnprintf (next, size, "\n"); 571 size -= temp; 572 next += temp; 573 } 574 spin_unlock_irqrestore (&ohci->lock, flags); 575 kfree (seen); 576 577 return PAGE_SIZE - size; 578 } 579 #undef DBG_SCHED_LIMIT 580 581 static ssize_t fill_registers_buffer(struct debug_buffer *buf) 582 { 583 struct usb_hcd *hcd; 584 struct ohci_hcd *ohci; 585 struct ohci_regs __iomem *regs; 586 unsigned long flags; 587 unsigned temp, size; 588 char *next; 589 u32 rdata; 590 591 ohci = buf->ohci; 592 hcd = ohci_to_hcd(ohci); 593 regs = ohci->regs; 594 next = buf->page; 595 size = PAGE_SIZE; 596 597 spin_lock_irqsave (&ohci->lock, flags); 598 599 /* dump driver info, then registers in spec order */ 600 601 ohci_dbg_nosw(ohci, &next, &size, 602 "bus %s, device %s\n" 603 "%s\n" 604 "%s\n", 605 hcd->self.controller->bus->name, 606 dev_name(hcd->self.controller), 607 hcd->product_desc, 608 hcd_name); 609 610 if (!HCD_HW_ACCESSIBLE(hcd)) { 611 size -= scnprintf (next, size, 612 "SUSPENDED (no register access)\n"); 613 goto done; 614 } 615 616 ohci_dump_status(ohci, &next, &size); 617 618 /* hcca */ 619 if (ohci->hcca) 620 ohci_dbg_nosw(ohci, &next, &size, 621 "hcca frame 0x%04x\n", ohci_frame_no(ohci)); 622 623 /* other registers mostly affect frame timings */ 624 rdata = ohci_readl (ohci, ®s->fminterval); 625 temp = scnprintf (next, size, 626 "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n", 627 rdata, (rdata >> 31) ? "FIT " : "", 628 (rdata >> 16) & 0xefff, rdata & 0xffff); 629 size -= temp; 630 next += temp; 631 632 rdata = ohci_readl (ohci, ®s->fmremaining); 633 temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n", 634 rdata, (rdata >> 31) ? "FRT " : "", 635 rdata & 0x3fff); 636 size -= temp; 637 next += temp; 638 639 rdata = ohci_readl (ohci, ®s->periodicstart); 640 temp = scnprintf (next, size, "periodicstart 0x%04x\n", 641 rdata & 0x3fff); 642 size -= temp; 643 next += temp; 644 645 rdata = ohci_readl (ohci, ®s->lsthresh); 646 temp = scnprintf (next, size, "lsthresh 0x%04x\n", 647 rdata & 0x3fff); 648 size -= temp; 649 next += temp; 650 651 temp = scnprintf (next, size, "hub poll timer %s\n", 652 HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off"); 653 size -= temp; 654 next += temp; 655 656 /* roothub */ 657 ohci_dump_roothub (ohci, 1, &next, &size); 658 659 done: 660 spin_unlock_irqrestore (&ohci->lock, flags); 661 662 return PAGE_SIZE - size; 663 } 664 665 static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci, 666 ssize_t (*fill_func)(struct debug_buffer *)) 667 { 668 struct debug_buffer *buf; 669 670 buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL); 671 672 if (buf) { 673 buf->ohci = ohci; 674 buf->fill_func = fill_func; 675 mutex_init(&buf->mutex); 676 } 677 678 return buf; 679 } 680 681 static int fill_buffer(struct debug_buffer *buf) 682 { 683 int ret; 684 685 if (!buf->page) 686 buf->page = (char *)get_zeroed_page(GFP_KERNEL); 687 688 if (!buf->page) { 689 ret = -ENOMEM; 690 goto out; 691 } 692 693 ret = buf->fill_func(buf); 694 695 if (ret >= 0) { 696 buf->count = ret; 697 ret = 0; 698 } 699 700 out: 701 return ret; 702 } 703 704 static ssize_t debug_output(struct file *file, char __user *user_buf, 705 size_t len, loff_t *offset) 706 { 707 struct debug_buffer *buf = file->private_data; 708 int ret; 709 710 mutex_lock(&buf->mutex); 711 if (buf->count == 0) { 712 ret = fill_buffer(buf); 713 if (ret != 0) { 714 mutex_unlock(&buf->mutex); 715 goto out; 716 } 717 } 718 mutex_unlock(&buf->mutex); 719 720 ret = simple_read_from_buffer(user_buf, len, offset, 721 buf->page, buf->count); 722 723 out: 724 return ret; 725 726 } 727 728 static int debug_close(struct inode *inode, struct file *file) 729 { 730 struct debug_buffer *buf = file->private_data; 731 732 if (buf) { 733 if (buf->page) 734 free_page((unsigned long)buf->page); 735 kfree(buf); 736 } 737 738 return 0; 739 } 740 static int debug_async_open(struct inode *inode, struct file *file) 741 { 742 file->private_data = alloc_buffer(inode->i_private, fill_async_buffer); 743 744 return file->private_data ? 0 : -ENOMEM; 745 } 746 747 static int debug_periodic_open(struct inode *inode, struct file *file) 748 { 749 file->private_data = alloc_buffer(inode->i_private, 750 fill_periodic_buffer); 751 752 return file->private_data ? 0 : -ENOMEM; 753 } 754 755 static int debug_registers_open(struct inode *inode, struct file *file) 756 { 757 file->private_data = alloc_buffer(inode->i_private, 758 fill_registers_buffer); 759 760 return file->private_data ? 0 : -ENOMEM; 761 } 762 static inline void create_debug_files (struct ohci_hcd *ohci) 763 { 764 struct usb_bus *bus = &ohci_to_hcd(ohci)->self; 765 struct dentry *root; 766 767 root = debugfs_create_dir(bus->bus_name, ohci_debug_root); 768 ohci->debug_dir = root; 769 770 debugfs_create_file("async", S_IRUGO, root, ohci, &debug_async_fops); 771 debugfs_create_file("periodic", S_IRUGO, root, ohci, 772 &debug_periodic_fops); 773 debugfs_create_file("registers", S_IRUGO, root, ohci, 774 &debug_registers_fops); 775 776 ohci_dbg (ohci, "created debug files\n"); 777 } 778 779 static inline void remove_debug_files (struct ohci_hcd *ohci) 780 { 781 debugfs_remove_recursive(ohci->debug_dir); 782 } 783 784 /*-------------------------------------------------------------------------*/ 785 786