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 __maybe_unused 27 urb_print(struct urb * urb, char * str, int small, int status) 28 { 29 unsigned int pipe= urb->pipe; 30 31 if (!urb->dev || !urb->dev->bus) { 32 printk(KERN_DEBUG "%s URB: no dev\n", str); 33 return; 34 } 35 36 #ifndef OHCI_VERBOSE_DEBUG 37 if (status != 0) 38 #endif 39 printk(KERN_DEBUG "%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d stat=%d\n", 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 status); 50 51 #ifdef OHCI_VERBOSE_DEBUG 52 if (!small) { 53 int i, len; 54 55 if (usb_pipecontrol (pipe)) { 56 printk (KERN_DEBUG "%s: setup(8):", __FILE__); 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 "%s: data(%d/%d):", __FILE__, 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? "...": "", status); 70 } 71 } 72 #endif 73 } 74 75 #define ohci_dbg_sw(ohci, next, size, format, arg...) \ 76 do { \ 77 if (next != NULL) { \ 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 /* Version for use where "next" is the address of a local variable */ 86 #define ohci_dbg_nosw(ohci, next, size, format, arg...) \ 87 do { \ 88 unsigned s_len; \ 89 s_len = scnprintf(*next, *size, format, ## arg); \ 90 *size -= s_len; *next += s_len; \ 91 } while (0); 92 93 94 static void ohci_dump_intr_mask ( 95 struct ohci_hcd *ohci, 96 char *label, 97 u32 mask, 98 char **next, 99 unsigned *size) 100 { 101 ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n", 102 label, 103 mask, 104 (mask & OHCI_INTR_MIE) ? " MIE" : "", 105 (mask & OHCI_INTR_OC) ? " OC" : "", 106 (mask & OHCI_INTR_RHSC) ? " RHSC" : "", 107 (mask & OHCI_INTR_FNO) ? " FNO" : "", 108 (mask & OHCI_INTR_UE) ? " UE" : "", 109 (mask & OHCI_INTR_RD) ? " RD" : "", 110 (mask & OHCI_INTR_SF) ? " SF" : "", 111 (mask & OHCI_INTR_WDH) ? " WDH" : "", 112 (mask & OHCI_INTR_SO) ? " SO" : "" 113 ); 114 } 115 116 static void maybe_print_eds ( 117 struct ohci_hcd *ohci, 118 char *label, 119 u32 value, 120 char **next, 121 unsigned *size) 122 { 123 if (value) 124 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value); 125 } 126 127 static char *hcfs2string (int state) 128 { 129 switch (state) { 130 case OHCI_USB_RESET: return "reset"; 131 case OHCI_USB_RESUME: return "resume"; 132 case OHCI_USB_OPER: return "operational"; 133 case OHCI_USB_SUSPEND: return "suspend"; 134 } 135 return "?"; 136 } 137 138 static const char *rh_state_string(struct ohci_hcd *ohci) 139 { 140 switch (ohci->rh_state) { 141 case OHCI_RH_HALTED: 142 return "halted"; 143 case OHCI_RH_SUSPENDED: 144 return "suspended"; 145 case OHCI_RH_RUNNING: 146 return "running"; 147 } 148 return "?"; 149 } 150 151 // dump control and status registers 152 static void 153 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size) 154 { 155 struct ohci_regs __iomem *regs = controller->regs; 156 u32 temp; 157 158 temp = ohci_readl (controller, ®s->revision) & 0xff; 159 ohci_dbg_sw (controller, next, size, 160 "OHCI %d.%d, %s legacy support registers, rh state %s\n", 161 0x03 & (temp >> 4), (temp & 0x0f), 162 (temp & 0x0100) ? "with" : "NO", 163 rh_state_string(controller)); 164 165 temp = ohci_readl (controller, ®s->control); 166 ohci_dbg_sw (controller, next, size, 167 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n", 168 temp, 169 (temp & OHCI_CTRL_RWE) ? " RWE" : "", 170 (temp & OHCI_CTRL_RWC) ? " RWC" : "", 171 (temp & OHCI_CTRL_IR) ? " IR" : "", 172 hcfs2string (temp & OHCI_CTRL_HCFS), 173 (temp & OHCI_CTRL_BLE) ? " BLE" : "", 174 (temp & OHCI_CTRL_CLE) ? " CLE" : "", 175 (temp & OHCI_CTRL_IE) ? " IE" : "", 176 (temp & OHCI_CTRL_PLE) ? " PLE" : "", 177 temp & OHCI_CTRL_CBSR 178 ); 179 180 temp = ohci_readl (controller, ®s->cmdstatus); 181 ohci_dbg_sw (controller, next, size, 182 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp, 183 (temp & OHCI_SOC) >> 16, 184 (temp & OHCI_OCR) ? " OCR" : "", 185 (temp & OHCI_BLF) ? " BLF" : "", 186 (temp & OHCI_CLF) ? " CLF" : "", 187 (temp & OHCI_HCR) ? " HCR" : "" 188 ); 189 190 ohci_dump_intr_mask (controller, "intrstatus", 191 ohci_readl (controller, ®s->intrstatus), 192 next, size); 193 ohci_dump_intr_mask (controller, "intrenable", 194 ohci_readl (controller, ®s->intrenable), 195 next, size); 196 // intrdisable always same as intrenable 197 198 maybe_print_eds (controller, "ed_periodcurrent", 199 ohci_readl (controller, ®s->ed_periodcurrent), 200 next, size); 201 202 maybe_print_eds (controller, "ed_controlhead", 203 ohci_readl (controller, ®s->ed_controlhead), 204 next, size); 205 maybe_print_eds (controller, "ed_controlcurrent", 206 ohci_readl (controller, ®s->ed_controlcurrent), 207 next, size); 208 209 maybe_print_eds (controller, "ed_bulkhead", 210 ohci_readl (controller, ®s->ed_bulkhead), 211 next, size); 212 maybe_print_eds (controller, "ed_bulkcurrent", 213 ohci_readl (controller, ®s->ed_bulkcurrent), 214 next, size); 215 216 maybe_print_eds (controller, "donehead", 217 ohci_readl (controller, ®s->donehead), next, size); 218 } 219 220 #define dbg_port_sw(hc,num,value,next,size) \ 221 ohci_dbg_sw (hc, next, size, \ 222 "roothub.portstatus [%d] " \ 223 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \ 224 num, temp, \ 225 (temp & RH_PS_PRSC) ? " PRSC" : "", \ 226 (temp & RH_PS_OCIC) ? " OCIC" : "", \ 227 (temp & RH_PS_PSSC) ? " PSSC" : "", \ 228 (temp & RH_PS_PESC) ? " PESC" : "", \ 229 (temp & RH_PS_CSC) ? " CSC" : "", \ 230 \ 231 (temp & RH_PS_LSDA) ? " LSDA" : "", \ 232 (temp & RH_PS_PPS) ? " PPS" : "", \ 233 (temp & RH_PS_PRS) ? " PRS" : "", \ 234 (temp & RH_PS_POCI) ? " POCI" : "", \ 235 (temp & RH_PS_PSS) ? " PSS" : "", \ 236 \ 237 (temp & RH_PS_PES) ? " PES" : "", \ 238 (temp & RH_PS_CCS) ? " CCS" : "" \ 239 ); 240 241 242 static void 243 ohci_dump_roothub ( 244 struct ohci_hcd *controller, 245 int verbose, 246 char **next, 247 unsigned *size) 248 { 249 u32 temp, i; 250 251 temp = roothub_a (controller); 252 if (temp == ~(u32)0) 253 return; 254 255 if (verbose) { 256 ohci_dbg_sw (controller, next, size, 257 "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp, 258 ((temp & RH_A_POTPGT) >> 24) & 0xff, 259 (temp & RH_A_NOCP) ? " NOCP" : "", 260 (temp & RH_A_OCPM) ? " OCPM" : "", 261 (temp & RH_A_DT) ? " DT" : "", 262 (temp & RH_A_NPS) ? " NPS" : "", 263 (temp & RH_A_PSM) ? " PSM" : "", 264 (temp & RH_A_NDP), controller->num_ports 265 ); 266 temp = roothub_b (controller); 267 ohci_dbg_sw (controller, next, size, 268 "roothub.b %08x PPCM=%04x DR=%04x\n", 269 temp, 270 (temp & RH_B_PPCM) >> 16, 271 (temp & RH_B_DR) 272 ); 273 temp = roothub_status (controller); 274 ohci_dbg_sw (controller, next, size, 275 "roothub.status %08x%s%s%s%s%s%s\n", 276 temp, 277 (temp & RH_HS_CRWE) ? " CRWE" : "", 278 (temp & RH_HS_OCIC) ? " OCIC" : "", 279 (temp & RH_HS_LPSC) ? " LPSC" : "", 280 (temp & RH_HS_DRWE) ? " DRWE" : "", 281 (temp & RH_HS_OCI) ? " OCI" : "", 282 (temp & RH_HS_LPS) ? " LPS" : "" 283 ); 284 } 285 286 for (i = 0; i < controller->num_ports; i++) { 287 temp = roothub_portstatus (controller, i); 288 dbg_port_sw (controller, i, temp, next, size); 289 } 290 } 291 292 static void ohci_dump (struct ohci_hcd *controller, int verbose) 293 { 294 ohci_dbg (controller, "OHCI controller state\n"); 295 296 // dumps some of the state we know about 297 ohci_dump_status (controller, NULL, NULL); 298 if (controller->hcca) 299 ohci_dbg (controller, 300 "hcca frame #%04x\n", ohci_frame_no(controller)); 301 ohci_dump_roothub (controller, 1, NULL, NULL); 302 } 303 304 static const char data0 [] = "DATA0"; 305 static const char data1 [] = "DATA1"; 306 307 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label, 308 const struct td *td) 309 { 310 u32 tmp = hc32_to_cpup (ohci, &td->hwINFO); 311 312 ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n", 313 label, td, 314 (tmp & TD_DONE) ? " (DONE)" : "", 315 td->urb, td->index, 316 hc32_to_cpup (ohci, &td->hwNextTD)); 317 if ((tmp & TD_ISO) == 0) { 318 const char *toggle, *pid; 319 u32 cbp, be; 320 321 switch (tmp & TD_T) { 322 case TD_T_DATA0: toggle = data0; break; 323 case TD_T_DATA1: toggle = data1; break; 324 case TD_T_TOGGLE: toggle = "(CARRY)"; break; 325 default: toggle = "(?)"; break; 326 } 327 switch (tmp & TD_DP) { 328 case TD_DP_SETUP: pid = "SETUP"; break; 329 case TD_DP_IN: pid = "IN"; break; 330 case TD_DP_OUT: pid = "OUT"; break; 331 default: pid = "(bad pid)"; break; 332 } 333 ohci_dbg (ohci, " info %08x CC=%x %s DI=%d %s %s\n", tmp, 334 TD_CC_GET(tmp), /* EC, */ toggle, 335 (tmp & TD_DI) >> 21, pid, 336 (tmp & TD_R) ? "R" : ""); 337 cbp = hc32_to_cpup (ohci, &td->hwCBP); 338 be = hc32_to_cpup (ohci, &td->hwBE); 339 ohci_dbg (ohci, " cbp %08x be %08x (len %d)\n", cbp, be, 340 cbp ? (be + 1 - cbp) : 0); 341 } else { 342 unsigned i; 343 ohci_dbg (ohci, " info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp, 344 TD_CC_GET(tmp), 345 (tmp >> 24) & 0x07, 346 (tmp & TD_DI) >> 21, 347 tmp & 0x0000ffff); 348 ohci_dbg (ohci, " bp0 %08x be %08x\n", 349 hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff, 350 hc32_to_cpup (ohci, &td->hwBE)); 351 for (i = 0; i < MAXPSW; i++) { 352 u16 psw = ohci_hwPSW (ohci, td, i); 353 int cc = (psw >> 12) & 0x0f; 354 ohci_dbg (ohci, " psw [%d] = %2x, CC=%x %s=%d\n", i, 355 psw, cc, 356 (cc >= 0x0e) ? "OFFSET" : "SIZE", 357 psw & 0x0fff); 358 } 359 } 360 } 361 362 /* caller MUST own hcd spinlock if verbose is set! */ 363 static void __maybe_unused 364 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label, 365 const struct ed *ed, int verbose) 366 { 367 u32 tmp = hc32_to_cpu (ohci, ed->hwINFO); 368 char *type = ""; 369 370 ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n", 371 label, 372 ed, ed->state, edstring (ed->type), 373 hc32_to_cpup (ohci, &ed->hwNextED)); 374 switch (tmp & (ED_IN|ED_OUT)) { 375 case ED_OUT: type = "-OUT"; break; 376 case ED_IN: type = "-IN"; break; 377 /* else from TDs ... control */ 378 } 379 ohci_dbg (ohci, 380 " info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp, 381 0x03ff & (tmp >> 16), 382 (tmp & ED_DEQUEUE) ? " DQ" : "", 383 (tmp & ED_ISO) ? " ISO" : "", 384 (tmp & ED_SKIP) ? " SKIP" : "", 385 (tmp & ED_LOWSPEED) ? " LOW" : "", 386 0x000f & (tmp >> 7), 387 type, 388 0x007f & tmp); 389 tmp = hc32_to_cpup (ohci, &ed->hwHeadP); 390 ohci_dbg (ohci, " tds: head %08x %s%s tail %08x%s\n", 391 tmp, 392 (tmp & ED_C) ? data1 : data0, 393 (tmp & ED_H) ? " HALT" : "", 394 hc32_to_cpup (ohci, &ed->hwTailP), 395 verbose ? "" : " (not listing)"); 396 if (verbose) { 397 struct list_head *tmp; 398 399 /* use ed->td_list because HC concurrently modifies 400 * hwNextTD as it accumulates ed_donelist. 401 */ 402 list_for_each (tmp, &ed->td_list) { 403 struct td *td; 404 td = list_entry (tmp, struct td, td_list); 405 ohci_dump_td (ohci, " ->", td); 406 } 407 } 408 } 409 410 #else 411 static inline void ohci_dump (struct ohci_hcd *controller, int verbose) {} 412 413 #undef OHCI_VERBOSE_DEBUG 414 415 #endif /* DEBUG */ 416 417 /*-------------------------------------------------------------------------*/ 418 419 #ifdef STUB_DEBUG_FILES 420 421 static inline void create_debug_files (struct ohci_hcd *bus) { } 422 static inline void remove_debug_files (struct ohci_hcd *bus) { } 423 424 #else 425 426 static int debug_async_open(struct inode *, struct file *); 427 static int debug_periodic_open(struct inode *, struct file *); 428 static int debug_registers_open(struct inode *, struct file *); 429 static int debug_async_open(struct inode *, struct file *); 430 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*); 431 static int debug_close(struct inode *, struct file *); 432 433 static const struct file_operations debug_async_fops = { 434 .owner = THIS_MODULE, 435 .open = debug_async_open, 436 .read = debug_output, 437 .release = debug_close, 438 .llseek = default_llseek, 439 }; 440 static const struct file_operations debug_periodic_fops = { 441 .owner = THIS_MODULE, 442 .open = debug_periodic_open, 443 .read = debug_output, 444 .release = debug_close, 445 .llseek = default_llseek, 446 }; 447 static const struct file_operations debug_registers_fops = { 448 .owner = THIS_MODULE, 449 .open = debug_registers_open, 450 .read = debug_output, 451 .release = debug_close, 452 .llseek = default_llseek, 453 }; 454 455 static struct dentry *ohci_debug_root; 456 457 struct debug_buffer { 458 ssize_t (*fill_func)(struct debug_buffer *); /* fill method */ 459 struct ohci_hcd *ohci; 460 struct mutex mutex; /* protect filling of buffer */ 461 size_t count; /* number of characters filled into buffer */ 462 char *page; 463 }; 464 465 static ssize_t 466 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed) 467 { 468 unsigned temp, size = count; 469 470 if (!ed) 471 return 0; 472 473 /* print first --> last */ 474 while (ed->ed_prev) 475 ed = ed->ed_prev; 476 477 /* dump a snapshot of the bulk or control schedule */ 478 while (ed) { 479 u32 info = hc32_to_cpu (ohci, ed->hwINFO); 480 u32 headp = hc32_to_cpu (ohci, ed->hwHeadP); 481 struct list_head *entry; 482 struct td *td; 483 484 temp = scnprintf (buf, size, 485 "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s", 486 ed, 487 (info & ED_LOWSPEED) ? 'l' : 'f', 488 info & 0x7f, 489 (info >> 7) & 0xf, 490 (info & ED_IN) ? "in" : "out", 491 0x03ff & (info >> 16), 492 info, 493 (info & ED_SKIP) ? " s" : "", 494 (headp & ED_H) ? " H" : "", 495 (headp & ED_C) ? data1 : data0); 496 size -= temp; 497 buf += temp; 498 499 list_for_each (entry, &ed->td_list) { 500 u32 cbp, be; 501 502 td = list_entry (entry, struct td, td_list); 503 info = hc32_to_cpup (ohci, &td->hwINFO); 504 cbp = hc32_to_cpup (ohci, &td->hwCBP); 505 be = hc32_to_cpup (ohci, &td->hwBE); 506 temp = scnprintf (buf, size, 507 "\n\ttd %p %s %d cc=%x urb %p (%08x)", 508 td, 509 ({ char *pid; 510 switch (info & TD_DP) { 511 case TD_DP_SETUP: pid = "setup"; break; 512 case TD_DP_IN: pid = "in"; break; 513 case TD_DP_OUT: pid = "out"; break; 514 default: pid = "(?)"; break; 515 } pid;}), 516 cbp ? (be + 1 - cbp) : 0, 517 TD_CC_GET (info), td->urb, info); 518 size -= temp; 519 buf += temp; 520 } 521 522 temp = scnprintf (buf, size, "\n"); 523 size -= temp; 524 buf += temp; 525 526 ed = ed->ed_next; 527 } 528 return count - size; 529 } 530 531 static ssize_t fill_async_buffer(struct debug_buffer *buf) 532 { 533 struct ohci_hcd *ohci; 534 size_t temp; 535 unsigned long flags; 536 537 ohci = buf->ohci; 538 539 /* display control and bulk lists together, for simplicity */ 540 spin_lock_irqsave (&ohci->lock, flags); 541 temp = show_list(ohci, buf->page, buf->count, ohci->ed_controltail); 542 temp += show_list(ohci, buf->page + temp, buf->count - temp, 543 ohci->ed_bulktail); 544 spin_unlock_irqrestore (&ohci->lock, flags); 545 546 return temp; 547 } 548 549 #define DBG_SCHED_LIMIT 64 550 551 static ssize_t fill_periodic_buffer(struct debug_buffer *buf) 552 { 553 struct ohci_hcd *ohci; 554 struct ed **seen, *ed; 555 unsigned long flags; 556 unsigned temp, size, seen_count; 557 char *next; 558 unsigned i; 559 560 if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC))) 561 return 0; 562 seen_count = 0; 563 564 ohci = buf->ohci; 565 next = buf->page; 566 size = PAGE_SIZE; 567 568 temp = scnprintf (next, size, "size = %d\n", NUM_INTS); 569 size -= temp; 570 next += temp; 571 572 /* dump a snapshot of the periodic schedule (and load) */ 573 spin_lock_irqsave (&ohci->lock, flags); 574 for (i = 0; i < NUM_INTS; i++) { 575 if (!(ed = ohci->periodic [i])) 576 continue; 577 578 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]); 579 size -= temp; 580 next += temp; 581 582 do { 583 temp = scnprintf (next, size, " ed%d/%p", 584 ed->interval, ed); 585 size -= temp; 586 next += temp; 587 for (temp = 0; temp < seen_count; temp++) { 588 if (seen [temp] == ed) 589 break; 590 } 591 592 /* show more info the first time around */ 593 if (temp == seen_count) { 594 u32 info = hc32_to_cpu (ohci, ed->hwINFO); 595 struct list_head *entry; 596 unsigned qlen = 0; 597 598 /* qlen measured here in TDs, not urbs */ 599 list_for_each (entry, &ed->td_list) 600 qlen++; 601 602 temp = scnprintf (next, size, 603 " (%cs dev%d ep%d%s-%s qlen %u" 604 " max %d %08x%s%s)", 605 (info & ED_LOWSPEED) ? 'l' : 'f', 606 info & 0x7f, 607 (info >> 7) & 0xf, 608 (info & ED_IN) ? "in" : "out", 609 (info & ED_ISO) ? "iso" : "int", 610 qlen, 611 0x03ff & (info >> 16), 612 info, 613 (info & ED_SKIP) ? " K" : "", 614 (ed->hwHeadP & 615 cpu_to_hc32(ohci, ED_H)) ? 616 " H" : ""); 617 size -= temp; 618 next += temp; 619 620 if (seen_count < DBG_SCHED_LIMIT) 621 seen [seen_count++] = ed; 622 623 ed = ed->ed_next; 624 625 } else { 626 /* we've seen it and what's after */ 627 temp = 0; 628 ed = NULL; 629 } 630 631 } while (ed); 632 633 temp = scnprintf (next, size, "\n"); 634 size -= temp; 635 next += temp; 636 } 637 spin_unlock_irqrestore (&ohci->lock, flags); 638 kfree (seen); 639 640 return PAGE_SIZE - size; 641 } 642 #undef DBG_SCHED_LIMIT 643 644 static ssize_t fill_registers_buffer(struct debug_buffer *buf) 645 { 646 struct usb_hcd *hcd; 647 struct ohci_hcd *ohci; 648 struct ohci_regs __iomem *regs; 649 unsigned long flags; 650 unsigned temp, size; 651 char *next; 652 u32 rdata; 653 654 ohci = buf->ohci; 655 hcd = ohci_to_hcd(ohci); 656 regs = ohci->regs; 657 next = buf->page; 658 size = PAGE_SIZE; 659 660 spin_lock_irqsave (&ohci->lock, flags); 661 662 /* dump driver info, then registers in spec order */ 663 664 ohci_dbg_nosw(ohci, &next, &size, 665 "bus %s, device %s\n" 666 "%s\n" 667 "%s\n", 668 hcd->self.controller->bus->name, 669 dev_name(hcd->self.controller), 670 hcd->product_desc, 671 hcd_name); 672 673 if (!HCD_HW_ACCESSIBLE(hcd)) { 674 size -= scnprintf (next, size, 675 "SUSPENDED (no register access)\n"); 676 goto done; 677 } 678 679 ohci_dump_status(ohci, &next, &size); 680 681 /* hcca */ 682 if (ohci->hcca) 683 ohci_dbg_nosw(ohci, &next, &size, 684 "hcca frame 0x%04x\n", ohci_frame_no(ohci)); 685 686 /* other registers mostly affect frame timings */ 687 rdata = ohci_readl (ohci, ®s->fminterval); 688 temp = scnprintf (next, size, 689 "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n", 690 rdata, (rdata >> 31) ? "FIT " : "", 691 (rdata >> 16) & 0xefff, rdata & 0xffff); 692 size -= temp; 693 next += temp; 694 695 rdata = ohci_readl (ohci, ®s->fmremaining); 696 temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n", 697 rdata, (rdata >> 31) ? "FRT " : "", 698 rdata & 0x3fff); 699 size -= temp; 700 next += temp; 701 702 rdata = ohci_readl (ohci, ®s->periodicstart); 703 temp = scnprintf (next, size, "periodicstart 0x%04x\n", 704 rdata & 0x3fff); 705 size -= temp; 706 next += temp; 707 708 rdata = ohci_readl (ohci, ®s->lsthresh); 709 temp = scnprintf (next, size, "lsthresh 0x%04x\n", 710 rdata & 0x3fff); 711 size -= temp; 712 next += temp; 713 714 temp = scnprintf (next, size, "hub poll timer %s\n", 715 HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off"); 716 size -= temp; 717 next += temp; 718 719 /* roothub */ 720 ohci_dump_roothub (ohci, 1, &next, &size); 721 722 done: 723 spin_unlock_irqrestore (&ohci->lock, flags); 724 725 return PAGE_SIZE - size; 726 } 727 728 static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci, 729 ssize_t (*fill_func)(struct debug_buffer *)) 730 { 731 struct debug_buffer *buf; 732 733 buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL); 734 735 if (buf) { 736 buf->ohci = ohci; 737 buf->fill_func = fill_func; 738 mutex_init(&buf->mutex); 739 } 740 741 return buf; 742 } 743 744 static int fill_buffer(struct debug_buffer *buf) 745 { 746 int ret = 0; 747 748 if (!buf->page) 749 buf->page = (char *)get_zeroed_page(GFP_KERNEL); 750 751 if (!buf->page) { 752 ret = -ENOMEM; 753 goto out; 754 } 755 756 ret = buf->fill_func(buf); 757 758 if (ret >= 0) { 759 buf->count = ret; 760 ret = 0; 761 } 762 763 out: 764 return ret; 765 } 766 767 static ssize_t debug_output(struct file *file, char __user *user_buf, 768 size_t len, loff_t *offset) 769 { 770 struct debug_buffer *buf = file->private_data; 771 int ret = 0; 772 773 mutex_lock(&buf->mutex); 774 if (buf->count == 0) { 775 ret = fill_buffer(buf); 776 if (ret != 0) { 777 mutex_unlock(&buf->mutex); 778 goto out; 779 } 780 } 781 mutex_unlock(&buf->mutex); 782 783 ret = simple_read_from_buffer(user_buf, len, offset, 784 buf->page, buf->count); 785 786 out: 787 return ret; 788 789 } 790 791 static int debug_close(struct inode *inode, struct file *file) 792 { 793 struct debug_buffer *buf = file->private_data; 794 795 if (buf) { 796 if (buf->page) 797 free_page((unsigned long)buf->page); 798 kfree(buf); 799 } 800 801 return 0; 802 } 803 static int debug_async_open(struct inode *inode, struct file *file) 804 { 805 file->private_data = alloc_buffer(inode->i_private, fill_async_buffer); 806 807 return file->private_data ? 0 : -ENOMEM; 808 } 809 810 static int debug_periodic_open(struct inode *inode, struct file *file) 811 { 812 file->private_data = alloc_buffer(inode->i_private, 813 fill_periodic_buffer); 814 815 return file->private_data ? 0 : -ENOMEM; 816 } 817 818 static int debug_registers_open(struct inode *inode, struct file *file) 819 { 820 file->private_data = alloc_buffer(inode->i_private, 821 fill_registers_buffer); 822 823 return file->private_data ? 0 : -ENOMEM; 824 } 825 static inline void create_debug_files (struct ohci_hcd *ohci) 826 { 827 struct usb_bus *bus = &ohci_to_hcd(ohci)->self; 828 829 ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root); 830 if (!ohci->debug_dir) 831 goto dir_error; 832 833 ohci->debug_async = debugfs_create_file("async", S_IRUGO, 834 ohci->debug_dir, ohci, 835 &debug_async_fops); 836 if (!ohci->debug_async) 837 goto async_error; 838 839 ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO, 840 ohci->debug_dir, ohci, 841 &debug_periodic_fops); 842 if (!ohci->debug_periodic) 843 goto periodic_error; 844 845 ohci->debug_registers = debugfs_create_file("registers", S_IRUGO, 846 ohci->debug_dir, ohci, 847 &debug_registers_fops); 848 if (!ohci->debug_registers) 849 goto registers_error; 850 851 ohci_dbg (ohci, "created debug files\n"); 852 return; 853 854 registers_error: 855 debugfs_remove(ohci->debug_periodic); 856 periodic_error: 857 debugfs_remove(ohci->debug_async); 858 async_error: 859 debugfs_remove(ohci->debug_dir); 860 dir_error: 861 ohci->debug_periodic = NULL; 862 ohci->debug_async = NULL; 863 ohci->debug_dir = NULL; 864 } 865 866 static inline void remove_debug_files (struct ohci_hcd *ohci) 867 { 868 debugfs_remove(ohci->debug_registers); 869 debugfs_remove(ohci->debug_periodic); 870 debugfs_remove(ohci->debug_async); 871 debugfs_remove(ohci->debug_dir); 872 } 873 874 #endif 875 876 /*-------------------------------------------------------------------------*/ 877 878