GNU Linux-libre 4.14.290-gnu1
[releases.git] / drivers / usb / host / ohci-dbg.c
1 /*
2  * OHCI HCD (Host Controller Driver) for USB.
3  *
4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6  *
7  * This file is licenced under the GPL.
8  */
9
10 /*-------------------------------------------------------------------------*/
11
12 #define edstring(ed_type) ({ char *temp; \
13         switch (ed_type) { \
14         case PIPE_CONTROL:      temp = "ctrl"; break; \
15         case PIPE_BULK:         temp = "bulk"; break; \
16         case PIPE_INTERRUPT:    temp = "intr"; break; \
17         default:                temp = "isoc"; break; \
18         } temp;})
19 #define pipestring(pipe) edstring(usb_pipetype(pipe))
20
21
22 #define ohci_dbg_sw(ohci, next, size, format, arg...) \
23         do { \
24         if (next != NULL) { \
25                 unsigned s_len; \
26                 s_len = scnprintf (*next, *size, format, ## arg ); \
27                 *size -= s_len; *next += s_len; \
28         } else \
29                 ohci_dbg(ohci,format, ## arg ); \
30         } while (0);
31
32 /* Version for use where "next" is the address of a local variable */
33 #define ohci_dbg_nosw(ohci, next, size, format, arg...) \
34         do { \
35                 unsigned s_len; \
36                 s_len = scnprintf(*next, *size, format, ## arg); \
37                 *size -= s_len; *next += s_len; \
38         } while (0);
39
40
41 static void ohci_dump_intr_mask (
42         struct ohci_hcd *ohci,
43         char *label,
44         u32 mask,
45         char **next,
46         unsigned *size)
47 {
48         ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
49                 label,
50                 mask,
51                 (mask & OHCI_INTR_MIE) ? " MIE" : "",
52                 (mask & OHCI_INTR_OC) ? " OC" : "",
53                 (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
54                 (mask & OHCI_INTR_FNO) ? " FNO" : "",
55                 (mask & OHCI_INTR_UE) ? " UE" : "",
56                 (mask & OHCI_INTR_RD) ? " RD" : "",
57                 (mask & OHCI_INTR_SF) ? " SF" : "",
58                 (mask & OHCI_INTR_WDH) ? " WDH" : "",
59                 (mask & OHCI_INTR_SO) ? " SO" : ""
60                 );
61 }
62
63 static void maybe_print_eds (
64         struct ohci_hcd *ohci,
65         char *label,
66         u32 value,
67         char **next,
68         unsigned *size)
69 {
70         if (value)
71                 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
72 }
73
74 static char *hcfs2string (int state)
75 {
76         switch (state) {
77                 case OHCI_USB_RESET:    return "reset";
78                 case OHCI_USB_RESUME:   return "resume";
79                 case OHCI_USB_OPER:     return "operational";
80                 case OHCI_USB_SUSPEND:  return "suspend";
81         }
82         return "?";
83 }
84
85 static const char *rh_state_string(struct ohci_hcd *ohci)
86 {
87         switch (ohci->rh_state) {
88         case OHCI_RH_HALTED:
89                 return "halted";
90         case OHCI_RH_SUSPENDED:
91                 return "suspended";
92         case OHCI_RH_RUNNING:
93                 return "running";
94         }
95         return "?";
96 }
97
98 // dump control and status registers
99 static void
100 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
101 {
102         struct ohci_regs __iomem *regs = controller->regs;
103         u32                     temp;
104
105         temp = ohci_readl (controller, &regs->revision) & 0xff;
106         ohci_dbg_sw (controller, next, size,
107                 "OHCI %d.%d, %s legacy support registers, rh state %s\n",
108                 0x03 & (temp >> 4), (temp & 0x0f),
109                 (temp & 0x0100) ? "with" : "NO",
110                 rh_state_string(controller));
111
112         temp = ohci_readl (controller, &regs->control);
113         ohci_dbg_sw (controller, next, size,
114                 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
115                 temp,
116                 (temp & OHCI_CTRL_RWE) ? " RWE" : "",
117                 (temp & OHCI_CTRL_RWC) ? " RWC" : "",
118                 (temp & OHCI_CTRL_IR) ? " IR" : "",
119                 hcfs2string (temp & OHCI_CTRL_HCFS),
120                 (temp & OHCI_CTRL_BLE) ? " BLE" : "",
121                 (temp & OHCI_CTRL_CLE) ? " CLE" : "",
122                 (temp & OHCI_CTRL_IE) ? " IE" : "",
123                 (temp & OHCI_CTRL_PLE) ? " PLE" : "",
124                 temp & OHCI_CTRL_CBSR
125                 );
126
127         temp = ohci_readl (controller, &regs->cmdstatus);
128         ohci_dbg_sw (controller, next, size,
129                 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
130                 (temp & OHCI_SOC) >> 16,
131                 (temp & OHCI_OCR) ? " OCR" : "",
132                 (temp & OHCI_BLF) ? " BLF" : "",
133                 (temp & OHCI_CLF) ? " CLF" : "",
134                 (temp & OHCI_HCR) ? " HCR" : ""
135                 );
136
137         ohci_dump_intr_mask (controller, "intrstatus",
138                         ohci_readl (controller, &regs->intrstatus),
139                         next, size);
140         ohci_dump_intr_mask (controller, "intrenable",
141                         ohci_readl (controller, &regs->intrenable),
142                         next, size);
143         // intrdisable always same as intrenable
144
145         maybe_print_eds (controller, "ed_periodcurrent",
146                         ohci_readl (controller, &regs->ed_periodcurrent),
147                         next, size);
148
149         maybe_print_eds (controller, "ed_controlhead",
150                         ohci_readl (controller, &regs->ed_controlhead),
151                         next, size);
152         maybe_print_eds (controller, "ed_controlcurrent",
153                         ohci_readl (controller, &regs->ed_controlcurrent),
154                         next, size);
155
156         maybe_print_eds (controller, "ed_bulkhead",
157                         ohci_readl (controller, &regs->ed_bulkhead),
158                         next, size);
159         maybe_print_eds (controller, "ed_bulkcurrent",
160                         ohci_readl (controller, &regs->ed_bulkcurrent),
161                         next, size);
162
163         maybe_print_eds (controller, "donehead",
164                         ohci_readl (controller, &regs->donehead), next, size);
165 }
166
167 #define dbg_port_sw(hc,num,value,next,size) \
168         ohci_dbg_sw (hc, next, size, \
169                 "roothub.portstatus [%d] " \
170                 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
171                 num, temp, \
172                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
173                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
174                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
175                 (temp & RH_PS_PESC) ? " PESC" : "", \
176                 (temp & RH_PS_CSC) ? " CSC" : "", \
177                 \
178                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
179                 (temp & RH_PS_PPS) ? " PPS" : "", \
180                 (temp & RH_PS_PRS) ? " PRS" : "", \
181                 (temp & RH_PS_POCI) ? " POCI" : "", \
182                 (temp & RH_PS_PSS) ? " PSS" : "", \
183                 \
184                 (temp & RH_PS_PES) ? " PES" : "", \
185                 (temp & RH_PS_CCS) ? " CCS" : "" \
186                 );
187
188
189 static void
190 ohci_dump_roothub (
191         struct ohci_hcd *controller,
192         int verbose,
193         char **next,
194         unsigned *size)
195 {
196         u32                     temp, i;
197
198         temp = roothub_a (controller);
199         if (temp == ~(u32)0)
200                 return;
201
202         if (verbose) {
203                 ohci_dbg_sw (controller, next, size,
204                         "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
205                         ((temp & RH_A_POTPGT) >> 24) & 0xff,
206                         (temp & RH_A_NOCP) ? " NOCP" : "",
207                         (temp & RH_A_OCPM) ? " OCPM" : "",
208                         (temp & RH_A_DT) ? " DT" : "",
209                         (temp & RH_A_NPS) ? " NPS" : "",
210                         (temp & RH_A_PSM) ? " PSM" : "",
211                         (temp & RH_A_NDP), controller->num_ports
212                         );
213                 temp = roothub_b (controller);
214                 ohci_dbg_sw (controller, next, size,
215                         "roothub.b %08x PPCM=%04x DR=%04x\n",
216                         temp,
217                         (temp & RH_B_PPCM) >> 16,
218                         (temp & RH_B_DR)
219                         );
220                 temp = roothub_status (controller);
221                 ohci_dbg_sw (controller, next, size,
222                         "roothub.status %08x%s%s%s%s%s%s\n",
223                         temp,
224                         (temp & RH_HS_CRWE) ? " CRWE" : "",
225                         (temp & RH_HS_OCIC) ? " OCIC" : "",
226                         (temp & RH_HS_LPSC) ? " LPSC" : "",
227                         (temp & RH_HS_DRWE) ? " DRWE" : "",
228                         (temp & RH_HS_OCI) ? " OCI" : "",
229                         (temp & RH_HS_LPS) ? " LPS" : ""
230                         );
231         }
232
233         for (i = 0; i < controller->num_ports; i++) {
234                 temp = roothub_portstatus (controller, i);
235                 dbg_port_sw (controller, i, temp, next, size);
236         }
237 }
238
239 static void ohci_dump(struct ohci_hcd *controller)
240 {
241         ohci_dbg (controller, "OHCI controller state\n");
242
243         // dumps some of the state we know about
244         ohci_dump_status (controller, NULL, NULL);
245         if (controller->hcca)
246                 ohci_dbg (controller,
247                         "hcca frame #%04x\n", ohci_frame_no(controller));
248         ohci_dump_roothub (controller, 1, NULL, NULL);
249 }
250
251 static const char data0 [] = "DATA0";
252 static const char data1 [] = "DATA1";
253
254 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
255                 const struct td *td)
256 {
257         u32     tmp = hc32_to_cpup (ohci, &td->hwINFO);
258
259         ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
260                 label, td,
261                 (tmp & TD_DONE) ? " (DONE)" : "",
262                 td->urb, td->index,
263                 hc32_to_cpup (ohci, &td->hwNextTD));
264         if ((tmp & TD_ISO) == 0) {
265                 const char      *toggle, *pid;
266                 u32     cbp, be;
267
268                 switch (tmp & TD_T) {
269                 case TD_T_DATA0: toggle = data0; break;
270                 case TD_T_DATA1: toggle = data1; break;
271                 case TD_T_TOGGLE: toggle = "(CARRY)"; break;
272                 default: toggle = "(?)"; break;
273                 }
274                 switch (tmp & TD_DP) {
275                 case TD_DP_SETUP: pid = "SETUP"; break;
276                 case TD_DP_IN: pid = "IN"; break;
277                 case TD_DP_OUT: pid = "OUT"; break;
278                 default: pid = "(bad pid)"; break;
279                 }
280                 ohci_dbg (ohci, "     info %08x CC=%x %s DI=%d %s %s\n", tmp,
281                         TD_CC_GET(tmp), /* EC, */ toggle,
282                         (tmp & TD_DI) >> 21, pid,
283                         (tmp & TD_R) ? "R" : "");
284                 cbp = hc32_to_cpup (ohci, &td->hwCBP);
285                 be = hc32_to_cpup (ohci, &td->hwBE);
286                 ohci_dbg (ohci, "     cbp %08x be %08x (len %d)\n", cbp, be,
287                         cbp ? (be + 1 - cbp) : 0);
288         } else {
289                 unsigned        i;
290                 ohci_dbg (ohci, "  info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
291                         TD_CC_GET(tmp),
292                         (tmp >> 24) & 0x07,
293                         (tmp & TD_DI) >> 21,
294                         tmp & 0x0000ffff);
295                 ohci_dbg (ohci, "  bp0 %08x be %08x\n",
296                         hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
297                         hc32_to_cpup (ohci, &td->hwBE));
298                 for (i = 0; i < MAXPSW; i++) {
299                         u16     psw = ohci_hwPSW (ohci, td, i);
300                         int     cc = (psw >> 12) & 0x0f;
301                         ohci_dbg (ohci, "    psw [%d] = %2x, CC=%x %s=%d\n", i,
302                                 psw, cc,
303                                 (cc >= 0x0e) ? "OFFSET" : "SIZE",
304                                 psw & 0x0fff);
305                 }
306         }
307 }
308
309 /* caller MUST own hcd spinlock if verbose is set! */
310 static void __maybe_unused
311 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
312                 const struct ed *ed, int verbose)
313 {
314         u32     tmp = hc32_to_cpu (ohci, ed->hwINFO);
315         char    *type = "";
316
317         ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
318                 label,
319                 ed, ed->state, edstring (ed->type),
320                 hc32_to_cpup (ohci, &ed->hwNextED));
321         switch (tmp & (ED_IN|ED_OUT)) {
322         case ED_OUT: type = "-OUT"; break;
323         case ED_IN: type = "-IN"; break;
324         /* else from TDs ... control */
325         }
326         ohci_dbg (ohci,
327                 "  info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
328                 0x03ff & (tmp >> 16),
329                 (tmp & ED_DEQUEUE) ? " DQ" : "",
330                 (tmp & ED_ISO) ? " ISO" : "",
331                 (tmp & ED_SKIP) ? " SKIP" : "",
332                 (tmp & ED_LOWSPEED) ? " LOW" : "",
333                 0x000f & (tmp >> 7),
334                 type,
335                 0x007f & tmp);
336         tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
337         ohci_dbg (ohci, "  tds: head %08x %s%s tail %08x%s\n",
338                 tmp,
339                 (tmp & ED_C) ? data1 : data0,
340                 (tmp & ED_H) ? " HALT" : "",
341                 hc32_to_cpup (ohci, &ed->hwTailP),
342                 verbose ? "" : " (not listing)");
343         if (verbose) {
344                 struct list_head        *tmp;
345
346                 /* use ed->td_list because HC concurrently modifies
347                  * hwNextTD as it accumulates ed_donelist.
348                  */
349                 list_for_each (tmp, &ed->td_list) {
350                         struct td               *td;
351                         td = list_entry (tmp, struct td, td_list);
352                         ohci_dump_td (ohci, "  ->", td);
353                 }
354         }
355 }
356
357 /*-------------------------------------------------------------------------*/
358
359 static int debug_async_open(struct inode *, struct file *);
360 static int debug_periodic_open(struct inode *, struct file *);
361 static int debug_registers_open(struct inode *, struct file *);
362 static int debug_async_open(struct inode *, struct file *);
363 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
364 static int debug_close(struct inode *, struct file *);
365
366 static const struct file_operations debug_async_fops = {
367         .owner          = THIS_MODULE,
368         .open           = debug_async_open,
369         .read           = debug_output,
370         .release        = debug_close,
371         .llseek         = default_llseek,
372 };
373 static const struct file_operations debug_periodic_fops = {
374         .owner          = THIS_MODULE,
375         .open           = debug_periodic_open,
376         .read           = debug_output,
377         .release        = debug_close,
378         .llseek         = default_llseek,
379 };
380 static const struct file_operations debug_registers_fops = {
381         .owner          = THIS_MODULE,
382         .open           = debug_registers_open,
383         .read           = debug_output,
384         .release        = debug_close,
385         .llseek         = default_llseek,
386 };
387
388 static struct dentry *ohci_debug_root;
389
390 struct debug_buffer {
391         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
392         struct ohci_hcd *ohci;
393         struct mutex mutex;     /* protect filling of buffer */
394         size_t count;           /* number of characters filled into buffer */
395         char *page;
396 };
397
398 static ssize_t
399 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
400 {
401         unsigned                temp, size = count;
402
403         if (!ed)
404                 return 0;
405
406         /* print first --> last */
407         while (ed->ed_prev)
408                 ed = ed->ed_prev;
409
410         /* dump a snapshot of the bulk or control schedule */
411         while (ed) {
412                 u32             info = hc32_to_cpu (ohci, ed->hwINFO);
413                 u32             headp = hc32_to_cpu (ohci, ed->hwHeadP);
414                 struct list_head *entry;
415                 struct td       *td;
416
417                 temp = scnprintf (buf, size,
418                         "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
419                         ed,
420                         (info & ED_LOWSPEED) ? 'l' : 'f',
421                         info & 0x7f,
422                         (info >> 7) & 0xf,
423                         (info & ED_IN) ? "in" : "out",
424                         0x03ff & (info >> 16),
425                         info,
426                         (info & ED_SKIP) ? " s" : "",
427                         (headp & ED_H) ? " H" : "",
428                         (headp & ED_C) ? data1 : data0);
429                 size -= temp;
430                 buf += temp;
431
432                 list_for_each (entry, &ed->td_list) {
433                         u32             cbp, be;
434
435                         td = list_entry (entry, struct td, td_list);
436                         info = hc32_to_cpup (ohci, &td->hwINFO);
437                         cbp = hc32_to_cpup (ohci, &td->hwCBP);
438                         be = hc32_to_cpup (ohci, &td->hwBE);
439                         temp = scnprintf (buf, size,
440                                         "\n\ttd %p %s %d cc=%x urb %p (%08x)",
441                                         td,
442                                         ({ char *pid;
443                                         switch (info & TD_DP) {
444                                         case TD_DP_SETUP: pid = "setup"; break;
445                                         case TD_DP_IN: pid = "in"; break;
446                                         case TD_DP_OUT: pid = "out"; break;
447                                         default: pid = "(?)"; break;
448                                          } pid;}),
449                                         cbp ? (be + 1 - cbp) : 0,
450                                         TD_CC_GET (info), td->urb, info);
451                         size -= temp;
452                         buf += temp;
453                 }
454
455                 temp = scnprintf (buf, size, "\n");
456                 size -= temp;
457                 buf += temp;
458
459                 ed = ed->ed_next;
460         }
461         return count - size;
462 }
463
464 static ssize_t fill_async_buffer(struct debug_buffer *buf)
465 {
466         struct ohci_hcd         *ohci;
467         size_t                  temp, size;
468         unsigned long           flags;
469
470         ohci = buf->ohci;
471         size = PAGE_SIZE;
472
473         /* display control and bulk lists together, for simplicity */
474         spin_lock_irqsave (&ohci->lock, flags);
475         temp = show_list(ohci, buf->page, size, ohci->ed_controltail);
476         temp += show_list(ohci, buf->page + temp, size - temp,
477                           ohci->ed_bulktail);
478         spin_unlock_irqrestore (&ohci->lock, flags);
479
480         return temp;
481 }
482
483 #define DBG_SCHED_LIMIT 64
484
485 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
486 {
487         struct ohci_hcd         *ohci;
488         struct ed               **seen, *ed;
489         unsigned long           flags;
490         unsigned                temp, size, seen_count;
491         char                    *next;
492         unsigned                i;
493
494         seen = kmalloc(DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC);
495         if (!seen)
496                 return 0;
497         seen_count = 0;
498
499         ohci = buf->ohci;
500         next = buf->page;
501         size = PAGE_SIZE;
502
503         temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
504         size -= temp;
505         next += temp;
506
507         /* dump a snapshot of the periodic schedule (and load) */
508         spin_lock_irqsave (&ohci->lock, flags);
509         for (i = 0; i < NUM_INTS; i++) {
510                 ed = ohci->periodic[i];
511                 if (!ed)
512                         continue;
513
514                 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
515                 size -= temp;
516                 next += temp;
517
518                 do {
519                         temp = scnprintf (next, size, " ed%d/%p",
520                                 ed->interval, ed);
521                         size -= temp;
522                         next += temp;
523                         for (temp = 0; temp < seen_count; temp++) {
524                                 if (seen [temp] == ed)
525                                         break;
526                         }
527
528                         /* show more info the first time around */
529                         if (temp == seen_count) {
530                                 u32     info = hc32_to_cpu (ohci, ed->hwINFO);
531                                 struct list_head        *entry;
532                                 unsigned                qlen = 0;
533
534                                 /* qlen measured here in TDs, not urbs */
535                                 list_for_each (entry, &ed->td_list)
536                                         qlen++;
537
538                                 temp = scnprintf (next, size,
539                                         " (%cs dev%d ep%d%s-%s qlen %u"
540                                         " max %d %08x%s%s)",
541                                         (info & ED_LOWSPEED) ? 'l' : 'f',
542                                         info & 0x7f,
543                                         (info >> 7) & 0xf,
544                                         (info & ED_IN) ? "in" : "out",
545                                         (info & ED_ISO) ? "iso" : "int",
546                                         qlen,
547                                         0x03ff & (info >> 16),
548                                         info,
549                                         (info & ED_SKIP) ? " K" : "",
550                                         (ed->hwHeadP &
551                                                 cpu_to_hc32(ohci, ED_H)) ?
552                                                         " H" : "");
553                                 size -= temp;
554                                 next += temp;
555
556                                 if (seen_count < DBG_SCHED_LIMIT)
557                                         seen [seen_count++] = ed;
558
559                                 ed = ed->ed_next;
560
561                         } else {
562                                 /* we've seen it and what's after */
563                                 temp = 0;
564                                 ed = NULL;
565                         }
566
567                 } while (ed);
568
569                 temp = scnprintf (next, size, "\n");
570                 size -= temp;
571                 next += temp;
572         }
573         spin_unlock_irqrestore (&ohci->lock, flags);
574         kfree (seen);
575
576         return PAGE_SIZE - size;
577 }
578 #undef DBG_SCHED_LIMIT
579
580 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
581 {
582         struct usb_hcd          *hcd;
583         struct ohci_hcd         *ohci;
584         struct ohci_regs __iomem *regs;
585         unsigned long           flags;
586         unsigned                temp, size;
587         char                    *next;
588         u32                     rdata;
589
590         ohci = buf->ohci;
591         hcd = ohci_to_hcd(ohci);
592         regs = ohci->regs;
593         next = buf->page;
594         size = PAGE_SIZE;
595
596         spin_lock_irqsave (&ohci->lock, flags);
597
598         /* dump driver info, then registers in spec order */
599
600         ohci_dbg_nosw(ohci, &next, &size,
601                 "bus %s, device %s\n"
602                 "%s\n"
603                 "%s\n",
604                 hcd->self.controller->bus->name,
605                 dev_name(hcd->self.controller),
606                 hcd->product_desc,
607                 hcd_name);
608
609         if (!HCD_HW_ACCESSIBLE(hcd)) {
610                 size -= scnprintf (next, size,
611                         "SUSPENDED (no register access)\n");
612                 goto done;
613         }
614
615         ohci_dump_status(ohci, &next, &size);
616
617         /* hcca */
618         if (ohci->hcca)
619                 ohci_dbg_nosw(ohci, &next, &size,
620                         "hcca frame 0x%04x\n", ohci_frame_no(ohci));
621
622         /* other registers mostly affect frame timings */
623         rdata = ohci_readl (ohci, &regs->fminterval);
624         temp = scnprintf (next, size,
625                         "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
626                         rdata, (rdata >> 31) ? "FIT " : "",
627                         (rdata >> 16) & 0xefff, rdata & 0xffff);
628         size -= temp;
629         next += temp;
630
631         rdata = ohci_readl (ohci, &regs->fmremaining);
632         temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
633                         rdata, (rdata >> 31) ? "FRT " : "",
634                         rdata & 0x3fff);
635         size -= temp;
636         next += temp;
637
638         rdata = ohci_readl (ohci, &regs->periodicstart);
639         temp = scnprintf (next, size, "periodicstart 0x%04x\n",
640                         rdata & 0x3fff);
641         size -= temp;
642         next += temp;
643
644         rdata = ohci_readl (ohci, &regs->lsthresh);
645         temp = scnprintf (next, size, "lsthresh 0x%04x\n",
646                         rdata & 0x3fff);
647         size -= temp;
648         next += temp;
649
650         temp = scnprintf (next, size, "hub poll timer %s\n",
651                         HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off");
652         size -= temp;
653         next += temp;
654
655         /* roothub */
656         ohci_dump_roothub (ohci, 1, &next, &size);
657
658 done:
659         spin_unlock_irqrestore (&ohci->lock, flags);
660
661         return PAGE_SIZE - size;
662 }
663
664 static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci,
665                                 ssize_t (*fill_func)(struct debug_buffer *))
666 {
667         struct debug_buffer *buf;
668
669         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
670
671         if (buf) {
672                 buf->ohci = ohci;
673                 buf->fill_func = fill_func;
674                 mutex_init(&buf->mutex);
675         }
676
677         return buf;
678 }
679
680 static int fill_buffer(struct debug_buffer *buf)
681 {
682         int ret = 0;
683
684         if (!buf->page)
685                 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
686
687         if (!buf->page) {
688                 ret = -ENOMEM;
689                 goto out;
690         }
691
692         ret = buf->fill_func(buf);
693
694         if (ret >= 0) {
695                 buf->count = ret;
696                 ret = 0;
697         }
698
699 out:
700         return ret;
701 }
702
703 static ssize_t debug_output(struct file *file, char __user *user_buf,
704                         size_t len, loff_t *offset)
705 {
706         struct debug_buffer *buf = file->private_data;
707         int ret = 0;
708
709         mutex_lock(&buf->mutex);
710         if (buf->count == 0) {
711                 ret = fill_buffer(buf);
712                 if (ret != 0) {
713                         mutex_unlock(&buf->mutex);
714                         goto out;
715                 }
716         }
717         mutex_unlock(&buf->mutex);
718
719         ret = simple_read_from_buffer(user_buf, len, offset,
720                                       buf->page, buf->count);
721
722 out:
723         return ret;
724
725 }
726
727 static int debug_close(struct inode *inode, struct file *file)
728 {
729         struct debug_buffer *buf = file->private_data;
730
731         if (buf) {
732                 if (buf->page)
733                         free_page((unsigned long)buf->page);
734                 kfree(buf);
735         }
736
737         return 0;
738 }
739 static int debug_async_open(struct inode *inode, struct file *file)
740 {
741         file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
742
743         return file->private_data ? 0 : -ENOMEM;
744 }
745
746 static int debug_periodic_open(struct inode *inode, struct file *file)
747 {
748         file->private_data = alloc_buffer(inode->i_private,
749                                           fill_periodic_buffer);
750
751         return file->private_data ? 0 : -ENOMEM;
752 }
753
754 static int debug_registers_open(struct inode *inode, struct file *file)
755 {
756         file->private_data = alloc_buffer(inode->i_private,
757                                           fill_registers_buffer);
758
759         return file->private_data ? 0 : -ENOMEM;
760 }
761 static inline void create_debug_files (struct ohci_hcd *ohci)
762 {
763         struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
764
765         ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
766         if (!ohci->debug_dir)
767                 goto dir_error;
768
769         ohci->debug_async = debugfs_create_file("async", S_IRUGO,
770                                                 ohci->debug_dir, ohci,
771                                                 &debug_async_fops);
772         if (!ohci->debug_async)
773                 goto async_error;
774
775         ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
776                                                    ohci->debug_dir, ohci,
777                                                    &debug_periodic_fops);
778         if (!ohci->debug_periodic)
779                 goto periodic_error;
780
781         ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
782                                                     ohci->debug_dir, ohci,
783                                                     &debug_registers_fops);
784         if (!ohci->debug_registers)
785                 goto registers_error;
786
787         ohci_dbg (ohci, "created debug files\n");
788         return;
789
790 registers_error:
791         debugfs_remove(ohci->debug_periodic);
792 periodic_error:
793         debugfs_remove(ohci->debug_async);
794 async_error:
795         debugfs_remove(ohci->debug_dir);
796 dir_error:
797         ohci->debug_periodic = NULL;
798         ohci->debug_async = NULL;
799         ohci->debug_dir = NULL;
800 }
801
802 static inline void remove_debug_files (struct ohci_hcd *ohci)
803 {
804         debugfs_remove(ohci->debug_registers);
805         debugfs_remove(ohci->debug_periodic);
806         debugfs_remove(ohci->debug_async);
807         debugfs_remove(ohci->debug_dir);
808 }
809
810 /*-------------------------------------------------------------------------*/
811