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1 office 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(KERN_INFO" %02x", ((__u8 *)urb->setup_packet)[i]);
118 printk(KERN_INFO "\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(KERN_INFO " %02x", ((__u8 *)urb->transfer_buffer)[i]);
128 printk(KERN_INFO "%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, int status) {}
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 .llseek = default_llseek,
405 };
406 static const struct file_operations debug_periodic_fops = {
407 .owner = THIS_MODULE,
408 .open = debug_periodic_open,
409 .read = debug_output,
410 .release = debug_close,
411 .llseek = default_llseek,
412 };
413 static const struct file_operations debug_registers_fops = {
414 .owner = THIS_MODULE,
415 .open = debug_registers_open,
416 .read = debug_output,
417 .release = debug_close,
418 .llseek = default_llseek,
419 };
420  
421 static struct dentry *admhc_debug_root;
422  
423 struct debug_buffer {
424 ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
425 struct admhcd *ahcd;
426 struct mutex mutex; /* protect filling of buffer */
427 size_t count; /* number of characters filled into buffer */
428 char *page;
429 };
430  
431 static ssize_t
432 show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
433 {
434 unsigned temp;
435 unsigned size = count;
436  
437 if (!ed)
438 return 0;
439  
440 /* dump a snapshot of the bulk or control schedule */
441 while (ed) {
442 u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
443 u32 headp = hc32_to_cpu(ahcd, ed->hwHeadP);
444 u32 tailp = hc32_to_cpu(ahcd, ed->hwTailP);
445 struct list_head *entry;
446 struct td *td;
447  
448 temp = scnprintf(buf, size,
449 "ed/%p %s %s %cs dev%d ep%d %s%smax %d %08x%s%s %s"
450 " h:%08x t:%08x",
451 ed,
452 ed_statestring(ed->state),
453 ed_typestring(ed->type),
454 (info & ED_SPEED_FULL) ? 'f' : 'l',
455 info & ED_FA_MASK,
456 (info >> ED_EN_SHIFT) & ED_EN_MASK,
457 (info & ED_INT) ? "INT " : "",
458 (info & ED_ISO) ? "ISO " : "",
459 (info >> ED_MPS_SHIFT) & ED_MPS_MASK ,
460 info,
461 (info & ED_SKIP) ? " S" : "",
462 (headp & ED_H) ? " H" : "",
463 (headp & ED_C) ? data1 : data0,
464 headp & ED_MASK, tailp);
465 size -= temp;
466 buf += temp;
467  
468 list_for_each(entry, &ed->td_list) {
469 u32 dbp, cbl;
470  
471 td = list_entry(entry, struct td, td_list);
472 info = hc32_to_cpup(ahcd, &td->hwINFO);
473 dbp = hc32_to_cpup(ahcd, &td->hwDBP);
474 cbl = hc32_to_cpup(ahcd, &td->hwCBL);
475  
476 temp = scnprintf(buf, size,
477 "\n\ttd/%p %s %d %s%scc=%x urb %p (%08x,%08x)",
478 td,
479 td_pidstring(info),
480 TD_BL_GET(cbl),
481 (info & TD_OWN) ? "" : "DONE ",
482 (cbl & TD_IE) ? "IE " : "",
483 TD_CC_GET(info), td->urb, info, cbl);
484 size -= temp;
485 buf += temp;
486 }
487  
488 temp = scnprintf(buf, size, "\n");
489 size -= temp;
490 buf += temp;
491  
492 ed = ed->ed_next;
493 }
494  
495 return count - size;
496 }
497  
498 static ssize_t fill_async_buffer(struct debug_buffer *buf)
499 {
500 struct admhcd *ahcd;
501 size_t temp;
502 unsigned long flags;
503  
504 ahcd = buf->ahcd;
505  
506 spin_lock_irqsave(&ahcd->lock, flags);
507 temp = show_list(ahcd, buf->page, PAGE_SIZE, ahcd->ed_head);
508 spin_unlock_irqrestore(&ahcd->lock, flags);
509  
510 return temp;
511 }
512  
513  
514 #define DBG_SCHED_LIMIT 64
515  
516 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
517 {
518 struct admhcd *ahcd;
519 struct ed **seen, *ed;
520 unsigned long flags;
521 unsigned temp, size, seen_count;
522 char *next;
523 unsigned i;
524  
525 seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC);
526 if (!seen)
527 return 0;
528 seen_count = 0;
529  
530 ahcd = buf->ahcd;
531 next = buf->page;
532 size = PAGE_SIZE;
533  
534 temp = scnprintf(next, size, "size = %d\n", NUM_INTS);
535 size -= temp;
536 next += temp;
537  
538 /* dump a snapshot of the periodic schedule (and load) */
539 spin_lock_irqsave(&ahcd->lock, flags);
540 for (i = 0; i < NUM_INTS; i++) {
541 ed = ahcd->periodic[i];
542 if (!ed)
543 continue;
544  
545 temp = scnprintf(next, size, "%2d [%3d]:", i, ahcd->load[i]);
546 size -= temp;
547 next += temp;
548  
549 do {
550 temp = scnprintf(next, size, " ed%d/%p",
551 ed->interval, ed);
552 size -= temp;
553 next += temp;
554 for (temp = 0; temp < seen_count; temp++) {
555 if (seen[temp] == ed)
556 break;
557 }
558  
559 /* show more info the first time around */
560 if (temp == seen_count) {
561 u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
562 struct list_head *entry;
563 unsigned qlen = 0;
564  
565 /* qlen measured here in TDs, not urbs */
566 list_for_each(entry, &ed->td_list)
567 qlen++;
568 temp = scnprintf(next, size,
569 " (%cs dev%d ep%d%s qlen %u"
570 " max %d %08x%s%s)",
571 (info & ED_SPEED_FULL) ? 'f' : 'l',
572 ED_FA_GET(info),
573 ED_EN_GET(info),
574 (info & ED_ISO) ? "iso" : "int",
575 qlen,
576 ED_MPS_GET(info),
577 info,
578 (info & ED_SKIP) ? " K" : "",
579 (ed->hwHeadP &
580 cpu_to_hc32(ahcd, ED_H)) ?
581 " H" : "");
582 size -= temp;
583 next += temp;
584  
585 if (seen_count < DBG_SCHED_LIMIT)
586 seen[seen_count++] = ed;
587  
588 ed = ed->ed_next;
589  
590 } else {
591 /* we've seen it and what's after */
592 temp = 0;
593 ed = NULL;
594 }
595  
596 } while (ed);
597  
598 temp = scnprintf(next, size, "\n");
599 size -= temp;
600 next += temp;
601 }
602 spin_unlock_irqrestore(&ahcd->lock, flags);
603 kfree(seen);
604  
605 return PAGE_SIZE - size;
606 }
607  
608  
609 #undef DBG_SCHED_LIMIT
610  
611 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
612 {
613 struct usb_hcd *hcd;
614 struct admhcd *ahcd;
615 struct admhcd_regs __iomem *regs;
616 unsigned long flags;
617 unsigned temp, size;
618 char *next;
619 u32 rdata;
620  
621 ahcd = buf->ahcd;
622 hcd = admhc_to_hcd(ahcd);
623 regs = ahcd->regs;
624 next = buf->page;
625 size = PAGE_SIZE;
626  
627 spin_lock_irqsave(&ahcd->lock, flags);
628  
629 /* dump driver info, then registers in spec order */
630  
631 admhc_dbg_sw(ahcd, &next, &size,
632 "bus %s, device %s\n"
633 "%s\n"
634 "%s\n",
635 hcd->self.controller->bus->name,
636 dev_name(hcd->self.controller),
637 hcd->product_desc,
638 hcd_name);
639  
640 if (!HCD_HW_ACCESSIBLE(hcd)) {
641 size -= scnprintf(next, size,
642 "SUSPENDED (no register access)\n");
643 goto done;
644 }
645  
646 admhc_dump_status(ahcd, &next, &size);
647  
648 /* other registers mostly affect frame timings */
649 rdata = admhc_readl(ahcd, &regs->fminterval);
650 temp = scnprintf(next, size,
651 "fmintvl 0x%08x %sFSLDP=0x%04x FI=0x%04x\n",
652 rdata, (rdata & ADMHC_SFI_FIT) ? "FIT " : "",
653 (rdata >> ADMHC_SFI_FSLDP_SHIFT) & ADMHC_SFI_FSLDP_MASK,
654 rdata & ADMHC_SFI_FI_MASK);
655 size -= temp;
656 next += temp;
657  
658 rdata = admhc_readl(ahcd, &regs->fmnumber);
659 temp = scnprintf(next, size, "fmnumber 0x%08x %sFR=0x%04x FN=%04x\n",
660 rdata, (rdata & ADMHC_SFN_FRT) ? "FRT " : "",
661 (rdata >> ADMHC_SFN_FR_SHIFT) & ADMHC_SFN_FR_MASK,
662 rdata & ADMHC_SFN_FN_MASK);
663 size -= temp;
664 next += temp;
665  
666 /* TODO: use predefined bitmask */
667 rdata = admhc_readl(ahcd, &regs->lsthresh);
668 temp = scnprintf(next, size, "lsthresh 0x%04x\n",
669 rdata & 0x3fff);
670 size -= temp;
671 next += temp;
672  
673 temp = scnprintf(next, size, "hub poll timer: %s\n",
674 admhcd_to_hcd(ahcd)->poll_rh ? "ON" : "OFF");
675 size -= temp;
676 next += temp;
677  
678 /* roothub */
679 admhc_dump_roothub(ahcd, 1, &next, &size);
680  
681 done:
682 spin_unlock_irqrestore(&ahcd->lock, flags);
683 return PAGE_SIZE - size;
684 }
685  
686  
687 static struct debug_buffer *alloc_buffer(struct admhcd *ahcd,
688 ssize_t (*fill_func)(struct debug_buffer *))
689 {
690 struct debug_buffer *buf;
691  
692 buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
693  
694 if (buf) {
695 buf->ahcd = ahcd;
696 buf->fill_func = fill_func;
697 mutex_init(&buf->mutex);
698 }
699  
700 return buf;
701 }
702  
703 static int fill_buffer(struct debug_buffer *buf)
704 {
705 int ret = 0;
706  
707 if (!buf->page)
708 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
709  
710 if (!buf->page) {
711 ret = -ENOMEM;
712 goto out;
713 }
714  
715 ret = buf->fill_func(buf);
716  
717 if (ret >= 0) {
718 buf->count = ret;
719 ret = 0;
720 }
721  
722 out:
723 return ret;
724 }
725  
726 static ssize_t debug_output(struct file *file, char __user *user_buf,
727 size_t len, loff_t *offset)
728 {
729 struct debug_buffer *buf = file->private_data;
730 int ret = 0;
731  
732 mutex_lock(&buf->mutex);
733 if (buf->count == 0) {
734 ret = fill_buffer(buf);
735 if (ret != 0) {
736 mutex_unlock(&buf->mutex);
737 goto out;
738 }
739 }
740 mutex_unlock(&buf->mutex);
741  
742 ret = simple_read_from_buffer(user_buf, len, offset,
743 buf->page, buf->count);
744  
745 out:
746 return ret;
747 }
748  
749 static int debug_close(struct inode *inode, struct file *file)
750 {
751 struct debug_buffer *buf = file->private_data;
752  
753 if (buf) {
754 if (buf->page)
755 free_page((unsigned long)buf->page);
756 kfree(buf);
757 }
758  
759 return 0;
760 }
761  
762 static int debug_async_open(struct inode *inode, struct file *file)
763 {
764 file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
765  
766 return file->private_data ? 0 : -ENOMEM;
767 }
768  
769 static int debug_periodic_open(struct inode *inode, struct file *file)
770 {
771 file->private_data = alloc_buffer(inode->i_private,
772 fill_periodic_buffer);
773  
774 return file->private_data ? 0 : -ENOMEM;
775 }
776  
777 static int debug_registers_open(struct inode *inode, struct file *file)
778 {
779 file->private_data = alloc_buffer(inode->i_private,
780 fill_registers_buffer);
781  
782 return file->private_data ? 0 : -ENOMEM;
783 }
784  
785 static inline void create_debug_files(struct admhcd *ahcd)
786 {
787 struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
788  
789 ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
790 if (!ahcd->debug_dir)
791 goto dir_error;
792  
793 ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
794 ahcd->debug_dir, ahcd,
795 &debug_async_fops);
796 if (!ahcd->debug_async)
797 goto async_error;
798  
799 ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
800 ahcd->debug_dir, ahcd,
801 &debug_periodic_fops);
802 if (!ahcd->debug_periodic)
803 goto periodic_error;
804  
805 ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
806 ahcd->debug_dir, ahcd,
807 &debug_registers_fops);
808 if (!ahcd->debug_registers)
809 goto registers_error;
810  
811 admhc_dbg(ahcd, "created debug files\n");
812 return;
813  
814 registers_error:
815 debugfs_remove(ahcd->debug_periodic);
816 periodic_error:
817 debugfs_remove(ahcd->debug_async);
818 async_error:
819 debugfs_remove(ahcd->debug_dir);
820 dir_error:
821 ahcd->debug_periodic = NULL;
822 ahcd->debug_async = NULL;
823 ahcd->debug_dir = NULL;
824 }
825  
826 static inline void remove_debug_files(struct admhcd *ahcd)
827 {
828 debugfs_remove(ahcd->debug_registers);
829 debugfs_remove(ahcd->debug_periodic);
830 debugfs_remove(ahcd->debug_async);
831 debugfs_remove(ahcd->debug_dir);
832 }
833  
834 #endif
835  
836 /*-------------------------------------------------------------------------*/