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

1/*
2 * ADM5120 HCD (Host Controller Driver) for USB
3 *
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * This file was derived from: drivers/usb/host/ohci-dbg.c
7 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
8 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 *
14 */
15
16/*-------------------------------------------------------------------------*/
17
18static 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
33static 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
46static inline char *pipestring(int pipe)
47{
48    return ed_typestring(usb_pipetype(pipe));
49}
50
51static 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
64static 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 */
84static void __attribute__((unused))
85urb_print(struct admhcd *ahcd, struct urb *urb, char *str, int small, int status)
86{
87    unsigned int pipe = urb->pipe;
88
89    if (!urb->dev || !urb->dev->bus) {
90        admhc_dbg(ahcd, "%s URB: no dev", str);
91        return;
92    }
93
94#ifndef ADMHC_VERBOSE_DEBUG
95    if (status != 0)
96#endif
97    admhc_dbg(ahcd, "URB-%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d "
98            "stat=%d\n",
99            str,
100            urb,
101            usb_pipedevice (pipe),
102            usb_pipeendpoint (pipe),
103            usb_pipeout(pipe)? "out" : "in",
104            pipestring(pipe),
105            urb->transfer_flags,
106            urb->actual_length,
107            urb->transfer_buffer_length,
108            status);
109
110#ifdef ADMHC_VERBOSE_DEBUG
111    if (!small) {
112        int i, len;
113
114        if (usb_pipecontrol(pipe)) {
115            admhc_dbg(ahcd, "setup(8):");
116            for (i = 0; i < 8 ; i++)
117                printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
118            printk ("\n");
119        }
120        if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
121            admhc_dbg(ahcd, "data(%d/%d):",
122                urb->actual_length,
123                urb->transfer_buffer_length);
124            len = usb_pipeout(pipe)?
125                        urb->transfer_buffer_length: urb->actual_length;
126            for (i = 0; i < 16 && i < len; i++)
127                printk(" %02x", ((__u8 *)urb->transfer_buffer)[i]);
128            printk("%s stat:%d\n", i < len? "...": "", status);
129        }
130    }
131#endif /* ADMHC_VERBOSE_DEBUG */
132}
133
134#define admhc_dbg_sw(ahcd, next, size, format, arg...) \
135    do { \
136    if (next) { \
137        unsigned s_len; \
138        s_len = scnprintf(*next, *size, format, ## arg ); \
139        *size -= s_len; *next += s_len; \
140    } else \
141        admhc_dbg(ahcd,format, ## arg ); \
142    } while (0);
143
144
145static 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
166static 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
173static 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
188static void
189admhc_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
245static void
246admhc_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
283static 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
295static const char data0[] = "DATA0";
296static const char data1[] = "DATA1";
297
298static 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! */
328static void __attribute__((unused))
329admhc_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
372static inline void urb_print(struct admhcd *ahcd, struct urb * urb, char * str,
373    int small, int status) {}
374static inline void admhc_dump_ed(const struct admhcd *ahcd, const char *label,
375    const struct ed *ed, int verbose) {}
376static inline void admhc_dump_td(const struct admhcd *ahcd, const char *label,
377    const struct td *td) {}
378static 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
388static inline void create_debug_files(struct admhcd *bus) { }
389static inline void remove_debug_files(struct admhcd *bus) { }
390
391#else
392
393static int debug_async_open(struct inode *, struct file *);
394static int debug_periodic_open(struct inode *, struct file *);
395static int debug_registers_open(struct inode *, struct file *);
396static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
397static int debug_close(struct inode *, struct file *);
398
399static 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};
405static const struct file_operations debug_periodic_fops = {
406    .owner = THIS_MODULE,
407    .open = debug_periodic_open,
408    .read = debug_output,
409    .release = debug_close,
410};
411static const struct file_operations debug_registers_fops = {
412    .owner = THIS_MODULE,
413    .open = debug_registers_open,
414    .read = debug_output,
415    .release = debug_close,
416};
417
418static struct dentry *admhc_debug_root;
419
420struct debug_buffer {
421    ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
422    struct device *dev;
423    struct mutex mutex; /* protect filling of buffer */
424    size_t count; /* number of characters filled into buffer */
425    char *page;
426};
427
428static ssize_t
429show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
430{
431    unsigned temp;
432    unsigned size = count;
433
434    if (!ed)
435        return 0;
436
437    /* dump a snapshot of the bulk or control schedule */
438    while (ed) {
439        u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
440        u32 headp = hc32_to_cpu(ahcd, ed->hwHeadP);
441        u32 tailp = hc32_to_cpu(ahcd, ed->hwTailP);
442        struct list_head *entry;
443        struct td *td;
444
445        temp = scnprintf(buf, size,
446            "ed/%p %s %s %cs dev%d ep%d %s%smax %d %08x%s%s %s"
447            " h:%08x t:%08x",
448            ed,
449            ed_statestring(ed->state),
450            ed_typestring (ed->type),
451            (info & ED_SPEED_FULL) ? 'f' : 'l',
452            info & ED_FA_MASK,
453            (info >> ED_EN_SHIFT) & ED_EN_MASK,
454            (info & ED_INT) ? "INT " : "",
455            (info & ED_ISO) ? "ISO " : "",
456            (info >> ED_MPS_SHIFT) & ED_MPS_MASK ,
457            info,
458            (info & ED_SKIP) ? " S" : "",
459            (headp & ED_H) ? " H" : "",
460            (headp & ED_C) ? data1 : data0,
461            headp & ED_MASK,tailp);
462        size -= temp;
463        buf += temp;
464
465        list_for_each(entry, &ed->td_list) {
466            u32 dbp, cbl;
467
468            td = list_entry(entry, struct td, td_list);
469            info = hc32_to_cpup (ahcd, &td->hwINFO);
470            dbp = hc32_to_cpup (ahcd, &td->hwDBP);
471            cbl = hc32_to_cpup (ahcd, &td->hwCBL);
472
473            temp = scnprintf(buf, size,
474                "\n\ttd/%p %s %d %s%scc=%x urb %p (%08x,%08x)",
475                td,
476                td_pidstring(info),
477                TD_BL_GET(cbl),
478                (info & TD_OWN) ? "" : "DONE ",
479                (cbl & TD_IE) ? "IE " : "",
480                TD_CC_GET (info), td->urb, info, cbl);
481            size -= temp;
482            buf += temp;
483        }
484
485        temp = scnprintf(buf, size, "\n");
486        size -= temp;
487        buf += temp;
488
489        ed = ed->ed_next;
490    }
491
492    return count - size;
493}
494
495static ssize_t fill_async_buffer(struct debug_buffer *buf)
496{
497    struct usb_bus *bus;
498    struct usb_hcd *hcd;
499    struct admhcd *ahcd;
500    size_t temp;
501    unsigned long flags;
502
503    bus = dev_get_drvdata(buf->dev);
504    hcd = bus_to_hcd(bus);
505    ahcd = hcd_to_admhcd(hcd);
506
507    spin_lock_irqsave(&ahcd->lock, flags);
508    temp = show_list(ahcd, buf->page, PAGE_SIZE, ahcd->ed_head);
509    spin_unlock_irqrestore(&ahcd->lock, flags);
510
511    return temp;
512}
513
514
515#define DBG_SCHED_LIMIT 64
516
517static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
518{
519    struct usb_bus *bus;
520    struct usb_hcd *hcd;
521    struct admhcd *ahcd;
522    struct ed **seen, *ed;
523    unsigned long flags;
524    unsigned temp, size, seen_count;
525    char *next;
526    unsigned i;
527
528    if (!(seen = kmalloc(DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
529        return 0;
530    seen_count = 0;
531
532    bus = dev_get_drvdata(buf->dev);
533    hcd = bus_to_hcd(bus);
534    ahcd = hcd_to_admhcd(hcd);
535    next = buf->page;
536    size = PAGE_SIZE;
537
538    temp = scnprintf(next, size, "size = %d\n", NUM_INTS);
539    size -= temp;
540    next += temp;
541
542    /* dump a snapshot of the periodic schedule (and load) */
543    spin_lock_irqsave(&ahcd->lock, flags);
544    for (i = 0; i < NUM_INTS; i++) {
545        if (!(ed = ahcd->periodic [i]))
546            continue;
547
548        temp = scnprintf(next, size, "%2d [%3d]:", i, ahcd->load [i]);
549        size -= temp;
550        next += temp;
551
552        do {
553            temp = scnprintf(next, size, " ed%d/%p",
554                ed->interval, ed);
555            size -= temp;
556            next += temp;
557            for (temp = 0; temp < seen_count; temp++) {
558                if (seen [temp] == ed)
559                    break;
560            }
561
562            /* show more info the first time around */
563            if (temp == seen_count) {
564                u32 info = hc32_to_cpu (ahcd, ed->hwINFO);
565                struct list_head *entry;
566                unsigned qlen = 0;
567
568                /* qlen measured here in TDs, not urbs */
569                list_for_each (entry, &ed->td_list)
570                    qlen++;
571                temp = scnprintf(next, size,
572                    " (%cs dev%d ep%d%s qlen %u"
573                    " max %d %08x%s%s)",
574                    (info & ED_SPEED_FULL) ? 'f' : 'l',
575                    ED_FA_GET(info),
576                    ED_EN_GET(info),
577                    (info & ED_ISO) ? "iso" : "int",
578                    qlen,
579                    ED_MPS_GET(info),
580                    info,
581                    (info & ED_SKIP) ? " K" : "",
582                    (ed->hwHeadP &
583                        cpu_to_hc32(ahcd, ED_H)) ?
584                            " H" : "");
585                size -= temp;
586                next += temp;
587
588                if (seen_count < DBG_SCHED_LIMIT)
589                    seen [seen_count++] = ed;
590
591                ed = ed->ed_next;
592
593            } else {
594                /* we've seen it and what's after */
595                temp = 0;
596                ed = NULL;
597            }
598
599        } while (ed);
600
601        temp = scnprintf(next, size, "\n");
602        size -= temp;
603        next += temp;
604    }
605    spin_unlock_irqrestore(&ahcd->lock, flags);
606    kfree (seen);
607
608    return PAGE_SIZE - size;
609}
610
611
612#undef DBG_SCHED_LIMIT
613
614static ssize_t fill_registers_buffer(struct debug_buffer *buf)
615{
616    struct usb_bus *bus;
617    struct usb_hcd *hcd;
618    struct admhcd *ahcd;
619    struct admhcd_regs __iomem *regs;
620    unsigned long flags;
621    unsigned temp, size;
622    char *next;
623    u32 rdata;
624
625    bus = dev_get_drvdata(buf->dev);
626    hcd = bus_to_hcd(bus);
627    ahcd = hcd_to_admhcd(hcd);
628    regs = ahcd->regs;
629    next = buf->page;
630    size = PAGE_SIZE;
631
632    spin_lock_irqsave(&ahcd->lock, flags);
633
634    /* dump driver info, then registers in spec order */
635
636    admhc_dbg_sw(ahcd, &next, &size,
637        "bus %s, device %s\n"
638        "%s\n"
639        "%s version " DRIVER_VERSION "\n",
640        hcd->self.controller->bus->name,
641        dev_name(hcd->self.controller),
642        hcd->product_desc,
643        hcd_name);
644
645    if (bus->controller->power.power_state.event) {
646        size -= scnprintf(next, size,
647            "SUSPENDED (no register access)\n");
648        goto done;
649    }
650
651    admhc_dump_status(ahcd, &next, &size);
652
653    /* other registers mostly affect frame timings */
654    rdata = admhc_readl(ahcd, &regs->fminterval);
655    temp = scnprintf(next, size,
656            "fmintvl 0x%08x %sFSLDP=0x%04x FI=0x%04x\n",
657            rdata, (rdata & ADMHC_SFI_FIT) ? "FIT " : "",
658            (rdata >> ADMHC_SFI_FSLDP_SHIFT) & ADMHC_SFI_FSLDP_MASK,
659            rdata & ADMHC_SFI_FI_MASK);
660    size -= temp;
661    next += temp;
662
663    rdata = admhc_readl(ahcd, &regs->fmnumber);
664    temp = scnprintf(next, size, "fmnumber 0x%08x %sFR=0x%04x FN=%04x\n",
665            rdata, (rdata & ADMHC_SFN_FRT) ? "FRT " : "",
666            (rdata >> ADMHC_SFN_FR_SHIFT) & ADMHC_SFN_FR_MASK,
667            rdata & ADMHC_SFN_FN_MASK);
668    size -= temp;
669    next += temp;
670
671    /* TODO: use predefined bitmask */
672    rdata = admhc_readl(ahcd, &regs->lsthresh);
673    temp = scnprintf(next, size, "lsthresh 0x%04x\n",
674            rdata & 0x3fff);
675    size -= temp;
676    next += temp;
677
678    temp = scnprintf(next, size, "hub poll timer: %s\n",
679            admhcd_to_hcd(ahcd)->poll_rh ? "ON" : "OFF");
680    size -= temp;
681    next += temp;
682
683    /* roothub */
684    admhc_dump_roothub(ahcd, 1, &next, &size);
685
686done:
687    spin_unlock_irqrestore(&ahcd->lock, flags);
688    return PAGE_SIZE - size;
689}
690
691
692static struct debug_buffer *alloc_buffer(struct device *dev,
693                ssize_t (*fill_func)(struct debug_buffer *))
694{
695    struct debug_buffer *buf;
696
697    buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
698
699    if (buf) {
700        buf->dev = dev;
701        buf->fill_func = fill_func;
702        mutex_init(&buf->mutex);
703    }
704
705    return buf;
706}
707
708static int fill_buffer(struct debug_buffer *buf)
709{
710    int ret = 0;
711
712    if (!buf->page)
713        buf->page = (char *)get_zeroed_page(GFP_KERNEL);
714
715    if (!buf->page) {
716        ret = -ENOMEM;
717        goto out;
718    }
719
720    ret = buf->fill_func(buf);
721
722    if (ret >= 0) {
723        buf->count = ret;
724        ret = 0;
725    }
726
727out:
728    return ret;
729}
730
731static ssize_t debug_output(struct file *file, char __user *user_buf,
732            size_t len, loff_t *offset)
733{
734    struct debug_buffer *buf = file->private_data;
735    int ret = 0;
736
737    mutex_lock(&buf->mutex);
738    if (buf->count == 0) {
739        ret = fill_buffer(buf);
740        if (ret != 0) {
741            mutex_unlock(&buf->mutex);
742            goto out;
743        }
744    }
745    mutex_unlock(&buf->mutex);
746
747    ret = simple_read_from_buffer(user_buf, len, offset,
748                    buf->page, buf->count);
749
750out:
751    return ret;
752}
753
754static int debug_close(struct inode *inode, struct file *file)
755{
756    struct debug_buffer *buf = file->private_data;
757
758    if (buf) {
759        if (buf->page)
760            free_page((unsigned long)buf->page);
761        kfree(buf);
762    }
763
764    return 0;
765}
766
767static int debug_async_open(struct inode *inode, struct file *file)
768{
769    file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
770
771    return file->private_data ? 0 : -ENOMEM;
772}
773
774static int debug_periodic_open(struct inode *inode, struct file *file)
775{
776    file->private_data = alloc_buffer(inode->i_private,
777                        fill_periodic_buffer);
778
779    return file->private_data ? 0 : -ENOMEM;
780}
781
782static int debug_registers_open(struct inode *inode, struct file *file)
783{
784    file->private_data = alloc_buffer(inode->i_private,
785                        fill_registers_buffer);
786
787    return file->private_data ? 0 : -ENOMEM;
788}
789
790static inline void create_debug_files(struct admhcd *ahcd)
791{
792    struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
793    struct device *dev = bus->dev;
794
795    ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
796    if (!ahcd->debug_dir)
797        goto dir_error;
798
799    ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
800                        ahcd->debug_dir, dev,
801                        &debug_async_fops);
802    if (!ahcd->debug_async)
803        goto async_error;
804
805    ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
806                        ahcd->debug_dir, dev,
807                        &debug_periodic_fops);
808    if (!ahcd->debug_periodic)
809        goto periodic_error;
810
811    ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
812                        ahcd->debug_dir, dev,
813                        &debug_registers_fops);
814    if (!ahcd->debug_registers)
815        goto registers_error;
816
817    admhc_dbg(ahcd, "created debug files\n");
818    return;
819
820registers_error:
821    debugfs_remove(ahcd->debug_periodic);
822periodic_error:
823    debugfs_remove(ahcd->debug_async);
824async_error:
825    debugfs_remove(ahcd->debug_dir);
826dir_error:
827    ahcd->debug_periodic = NULL;
828    ahcd->debug_async = NULL;
829    ahcd->debug_dir = NULL;
830}
831
832static inline void remove_debug_files(struct admhcd *ahcd)
833{
834    debugfs_remove(ahcd->debug_registers);
835    debugfs_remove(ahcd->debug_periodic);
836    debugfs_remove(ahcd->debug_async);
837    debugfs_remove(ahcd->debug_dir);
838}
839
840#endif
841
842/*-------------------------------------------------------------------------*/
843

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