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0001 // SPDX-License-Identifier: GPL-1.0+
0002 /*
0003  * OHCI HCD (Host Controller Driver) for USB.
0004  *
0005  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
0006  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
0007  *
0008  * This file is licenced under the GPL.
0009  */
0010 
0011 /*-------------------------------------------------------------------------*/
0012 
0013 #define edstring(ed_type) ({ char *temp; \
0014     switch (ed_type) { \
0015     case PIPE_CONTROL:  temp = "ctrl"; break; \
0016     case PIPE_BULK:     temp = "bulk"; break; \
0017     case PIPE_INTERRUPT:    temp = "intr"; break; \
0018     default:        temp = "isoc"; break; \
0019     } temp;})
0020 #define pipestring(pipe) edstring(usb_pipetype(pipe))
0021 
0022 
0023 #define ohci_dbg_sw(ohci, next, size, format, arg...) \
0024     do { \
0025     if (next != NULL) { \
0026         unsigned s_len; \
0027         s_len = scnprintf (*next, *size, format, ## arg ); \
0028         *size -= s_len; *next += s_len; \
0029     } else \
0030         ohci_dbg(ohci,format, ## arg ); \
0031     } while (0);
0032 
0033 /* Version for use where "next" is the address of a local variable */
0034 #define ohci_dbg_nosw(ohci, next, size, format, arg...) \
0035     do { \
0036         unsigned s_len; \
0037         s_len = scnprintf(*next, *size, format, ## arg); \
0038         *size -= s_len; *next += s_len; \
0039     } while (0);
0040 
0041 
0042 static void ohci_dump_intr_mask (
0043     struct ohci_hcd *ohci,
0044     char *label,
0045     u32 mask,
0046     char **next,
0047     unsigned *size)
0048 {
0049     ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
0050         label,
0051         mask,
0052         (mask & OHCI_INTR_MIE) ? " MIE" : "",
0053         (mask & OHCI_INTR_OC) ? " OC" : "",
0054         (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
0055         (mask & OHCI_INTR_FNO) ? " FNO" : "",
0056         (mask & OHCI_INTR_UE) ? " UE" : "",
0057         (mask & OHCI_INTR_RD) ? " RD" : "",
0058         (mask & OHCI_INTR_SF) ? " SF" : "",
0059         (mask & OHCI_INTR_WDH) ? " WDH" : "",
0060         (mask & OHCI_INTR_SO) ? " SO" : ""
0061         );
0062 }
0063 
0064 static void maybe_print_eds (
0065     struct ohci_hcd *ohci,
0066     char *label,
0067     u32 value,
0068     char **next,
0069     unsigned *size)
0070 {
0071     if (value)
0072         ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
0073 }
0074 
0075 static char *hcfs2string (int state)
0076 {
0077     switch (state) {
0078         case OHCI_USB_RESET:    return "reset";
0079         case OHCI_USB_RESUME:   return "resume";
0080         case OHCI_USB_OPER: return "operational";
0081         case OHCI_USB_SUSPEND:  return "suspend";
0082     }
0083     return "?";
0084 }
0085 
0086 static const char *rh_state_string(struct ohci_hcd *ohci)
0087 {
0088     switch (ohci->rh_state) {
0089     case OHCI_RH_HALTED:
0090         return "halted";
0091     case OHCI_RH_SUSPENDED:
0092         return "suspended";
0093     case OHCI_RH_RUNNING:
0094         return "running";
0095     }
0096     return "?";
0097 }
0098 
0099 // dump control and status registers
0100 static void
0101 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
0102 {
0103     struct ohci_regs __iomem *regs = controller->regs;
0104     u32         temp;
0105 
0106     temp = ohci_readl (controller, &regs->revision) & 0xff;
0107     ohci_dbg_sw (controller, next, size,
0108         "OHCI %d.%d, %s legacy support registers, rh state %s\n",
0109         0x03 & (temp >> 4), (temp & 0x0f),
0110         (temp & 0x0100) ? "with" : "NO",
0111         rh_state_string(controller));
0112 
0113     temp = ohci_readl (controller, &regs->control);
0114     ohci_dbg_sw (controller, next, size,
0115         "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
0116         temp,
0117         (temp & OHCI_CTRL_RWE) ? " RWE" : "",
0118         (temp & OHCI_CTRL_RWC) ? " RWC" : "",
0119         (temp & OHCI_CTRL_IR) ? " IR" : "",
0120         hcfs2string (temp & OHCI_CTRL_HCFS),
0121         (temp & OHCI_CTRL_BLE) ? " BLE" : "",
0122         (temp & OHCI_CTRL_CLE) ? " CLE" : "",
0123         (temp & OHCI_CTRL_IE) ? " IE" : "",
0124         (temp & OHCI_CTRL_PLE) ? " PLE" : "",
0125         temp & OHCI_CTRL_CBSR
0126         );
0127 
0128     temp = ohci_readl (controller, &regs->cmdstatus);
0129     ohci_dbg_sw (controller, next, size,
0130         "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
0131         (temp & OHCI_SOC) >> 16,
0132         (temp & OHCI_OCR) ? " OCR" : "",
0133         (temp & OHCI_BLF) ? " BLF" : "",
0134         (temp & OHCI_CLF) ? " CLF" : "",
0135         (temp & OHCI_HCR) ? " HCR" : ""
0136         );
0137 
0138     ohci_dump_intr_mask (controller, "intrstatus",
0139             ohci_readl (controller, &regs->intrstatus),
0140             next, size);
0141     ohci_dump_intr_mask (controller, "intrenable",
0142             ohci_readl (controller, &regs->intrenable),
0143             next, size);
0144     // intrdisable always same as intrenable
0145 
0146     maybe_print_eds (controller, "ed_periodcurrent",
0147             ohci_readl (controller, &regs->ed_periodcurrent),
0148             next, size);
0149 
0150     maybe_print_eds (controller, "ed_controlhead",
0151             ohci_readl (controller, &regs->ed_controlhead),
0152             next, size);
0153     maybe_print_eds (controller, "ed_controlcurrent",
0154             ohci_readl (controller, &regs->ed_controlcurrent),
0155             next, size);
0156 
0157     maybe_print_eds (controller, "ed_bulkhead",
0158             ohci_readl (controller, &regs->ed_bulkhead),
0159             next, size);
0160     maybe_print_eds (controller, "ed_bulkcurrent",
0161             ohci_readl (controller, &regs->ed_bulkcurrent),
0162             next, size);
0163 
0164     maybe_print_eds (controller, "donehead",
0165             ohci_readl (controller, &regs->donehead), next, size);
0166 }
0167 
0168 #define dbg_port_sw(hc,num,value,next,size) \
0169     ohci_dbg_sw (hc, next, size, \
0170         "roothub.portstatus [%d] " \
0171         "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
0172         num, temp, \
0173         (temp & RH_PS_PRSC) ? " PRSC" : "", \
0174         (temp & RH_PS_OCIC) ? " OCIC" : "", \
0175         (temp & RH_PS_PSSC) ? " PSSC" : "", \
0176         (temp & RH_PS_PESC) ? " PESC" : "", \
0177         (temp & RH_PS_CSC) ? " CSC" : "", \
0178         \
0179         (temp & RH_PS_LSDA) ? " LSDA" : "", \
0180         (temp & RH_PS_PPS) ? " PPS" : "", \
0181         (temp & RH_PS_PRS) ? " PRS" : "", \
0182         (temp & RH_PS_POCI) ? " POCI" : "", \
0183         (temp & RH_PS_PSS) ? " PSS" : "", \
0184         \
0185         (temp & RH_PS_PES) ? " PES" : "", \
0186         (temp & RH_PS_CCS) ? " CCS" : "" \
0187         );
0188 
0189 
0190 static void
0191 ohci_dump_roothub (
0192     struct ohci_hcd *controller,
0193     int verbose,
0194     char **next,
0195     unsigned *size)
0196 {
0197     u32         temp, i;
0198 
0199     temp = roothub_a (controller);
0200     if (temp == ~(u32)0)
0201         return;
0202 
0203     if (verbose) {
0204         ohci_dbg_sw (controller, next, size,
0205             "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
0206             ((temp & RH_A_POTPGT) >> 24) & 0xff,
0207             (temp & RH_A_NOCP) ? " NOCP" : "",
0208             (temp & RH_A_OCPM) ? " OCPM" : "",
0209             (temp & RH_A_DT) ? " DT" : "",
0210             (temp & RH_A_NPS) ? " NPS" : "",
0211             (temp & RH_A_PSM) ? " PSM" : "",
0212             (temp & RH_A_NDP), controller->num_ports
0213             );
0214         temp = roothub_b (controller);
0215         ohci_dbg_sw (controller, next, size,
0216             "roothub.b %08x PPCM=%04x DR=%04x\n",
0217             temp,
0218             (temp & RH_B_PPCM) >> 16,
0219             (temp & RH_B_DR)
0220             );
0221         temp = roothub_status (controller);
0222         ohci_dbg_sw (controller, next, size,
0223             "roothub.status %08x%s%s%s%s%s%s\n",
0224             temp,
0225             (temp & RH_HS_CRWE) ? " CRWE" : "",
0226             (temp & RH_HS_OCIC) ? " OCIC" : "",
0227             (temp & RH_HS_LPSC) ? " LPSC" : "",
0228             (temp & RH_HS_DRWE) ? " DRWE" : "",
0229             (temp & RH_HS_OCI) ? " OCI" : "",
0230             (temp & RH_HS_LPS) ? " LPS" : ""
0231             );
0232     }
0233 
0234     for (i = 0; i < controller->num_ports; i++) {
0235         temp = roothub_portstatus (controller, i);
0236         dbg_port_sw (controller, i, temp, next, size);
0237     }
0238 }
0239 
0240 static void ohci_dump(struct ohci_hcd *controller)
0241 {
0242     ohci_dbg (controller, "OHCI controller state\n");
0243 
0244     // dumps some of the state we know about
0245     ohci_dump_status (controller, NULL, NULL);
0246     if (controller->hcca)
0247         ohci_dbg (controller,
0248             "hcca frame #%04x\n", ohci_frame_no(controller));
0249     ohci_dump_roothub (controller, 1, NULL, NULL);
0250 }
0251 
0252 static const char data0 [] = "DATA0";
0253 static const char data1 [] = "DATA1";
0254 
0255 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
0256         const struct td *td)
0257 {
0258     u32 tmp = hc32_to_cpup (ohci, &td->hwINFO);
0259 
0260     ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
0261         label, td,
0262         (tmp & TD_DONE) ? " (DONE)" : "",
0263         td->urb, td->index,
0264         hc32_to_cpup (ohci, &td->hwNextTD));
0265     if ((tmp & TD_ISO) == 0) {
0266         const char  *toggle, *pid;
0267         u32 cbp, be;
0268 
0269         switch (tmp & TD_T) {
0270         case TD_T_DATA0: toggle = data0; break;
0271         case TD_T_DATA1: toggle = data1; break;
0272         case TD_T_TOGGLE: toggle = "(CARRY)"; break;
0273         default: toggle = "(?)"; break;
0274         }
0275         switch (tmp & TD_DP) {
0276         case TD_DP_SETUP: pid = "SETUP"; break;
0277         case TD_DP_IN: pid = "IN"; break;
0278         case TD_DP_OUT: pid = "OUT"; break;
0279         default: pid = "(bad pid)"; break;
0280         }
0281         ohci_dbg (ohci, "     info %08x CC=%x %s DI=%d %s %s\n", tmp,
0282             TD_CC_GET(tmp), /* EC, */ toggle,
0283             (tmp & TD_DI) >> 21, pid,
0284             (tmp & TD_R) ? "R" : "");
0285         cbp = hc32_to_cpup (ohci, &td->hwCBP);
0286         be = hc32_to_cpup (ohci, &td->hwBE);
0287         ohci_dbg (ohci, "     cbp %08x be %08x (len %d)\n", cbp, be,
0288             cbp ? (be + 1 - cbp) : 0);
0289     } else {
0290         unsigned    i;
0291         ohci_dbg (ohci, "  info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
0292             TD_CC_GET(tmp),
0293             (tmp >> 24) & 0x07,
0294             (tmp & TD_DI) >> 21,
0295             tmp & 0x0000ffff);
0296         ohci_dbg (ohci, "  bp0 %08x be %08x\n",
0297             hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
0298             hc32_to_cpup (ohci, &td->hwBE));
0299         for (i = 0; i < MAXPSW; i++) {
0300             u16 psw = ohci_hwPSW (ohci, td, i);
0301             int cc = (psw >> 12) & 0x0f;
0302             ohci_dbg (ohci, "    psw [%d] = %2x, CC=%x %s=%d\n", i,
0303                 psw, cc,
0304                 (cc >= 0x0e) ? "OFFSET" : "SIZE",
0305                 psw & 0x0fff);
0306         }
0307     }
0308 }
0309 
0310 /* caller MUST own hcd spinlock if verbose is set! */
0311 static void __maybe_unused
0312 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
0313         const struct ed *ed, int verbose)
0314 {
0315     u32 tmp = hc32_to_cpu (ohci, ed->hwINFO);
0316     char    *type = "";
0317 
0318     ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
0319         label,
0320         ed, ed->state, edstring (ed->type),
0321         hc32_to_cpup (ohci, &ed->hwNextED));
0322     switch (tmp & (ED_IN|ED_OUT)) {
0323     case ED_OUT: type = "-OUT"; break;
0324     case ED_IN: type = "-IN"; break;
0325     /* else from TDs ... control */
0326     }
0327     ohci_dbg (ohci,
0328         "  info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
0329         0x03ff & (tmp >> 16),
0330         (tmp & ED_DEQUEUE) ? " DQ" : "",
0331         (tmp & ED_ISO) ? " ISO" : "",
0332         (tmp & ED_SKIP) ? " SKIP" : "",
0333         (tmp & ED_LOWSPEED) ? " LOW" : "",
0334         0x000f & (tmp >> 7),
0335         type,
0336         0x007f & tmp);
0337     tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
0338     ohci_dbg (ohci, "  tds: head %08x %s%s tail %08x%s\n",
0339         tmp,
0340         (tmp & ED_C) ? data1 : data0,
0341         (tmp & ED_H) ? " HALT" : "",
0342         hc32_to_cpup (ohci, &ed->hwTailP),
0343         verbose ? "" : " (not listing)");
0344     if (verbose) {
0345         struct list_head    *tmp;
0346 
0347         /* use ed->td_list because HC concurrently modifies
0348          * hwNextTD as it accumulates ed_donelist.
0349          */
0350         list_for_each (tmp, &ed->td_list) {
0351             struct td       *td;
0352             td = list_entry (tmp, struct td, td_list);
0353             ohci_dump_td (ohci, "  ->", td);
0354         }
0355     }
0356 }
0357 
0358 /*-------------------------------------------------------------------------*/
0359 
0360 static int debug_async_open(struct inode *, struct file *);
0361 static int debug_periodic_open(struct inode *, struct file *);
0362 static int debug_registers_open(struct inode *, struct file *);
0363 static int debug_async_open(struct inode *, struct file *);
0364 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
0365 static int debug_close(struct inode *, struct file *);
0366 
0367 static const struct file_operations debug_async_fops = {
0368     .owner      = THIS_MODULE,
0369     .open       = debug_async_open,
0370     .read       = debug_output,
0371     .release    = debug_close,
0372     .llseek     = default_llseek,
0373 };
0374 static const struct file_operations debug_periodic_fops = {
0375     .owner      = THIS_MODULE,
0376     .open       = debug_periodic_open,
0377     .read       = debug_output,
0378     .release    = debug_close,
0379     .llseek     = default_llseek,
0380 };
0381 static const struct file_operations debug_registers_fops = {
0382     .owner      = THIS_MODULE,
0383     .open       = debug_registers_open,
0384     .read       = debug_output,
0385     .release    = debug_close,
0386     .llseek     = default_llseek,
0387 };
0388 
0389 static struct dentry *ohci_debug_root;
0390 
0391 struct debug_buffer {
0392     ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
0393     struct ohci_hcd *ohci;
0394     struct mutex mutex; /* protect filling of buffer */
0395     size_t count;       /* number of characters filled into buffer */
0396     char *page;
0397 };
0398 
0399 static ssize_t
0400 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
0401 {
0402     unsigned        temp, size = count;
0403 
0404     if (!ed)
0405         return 0;
0406 
0407     /* print first --> last */
0408     while (ed->ed_prev)
0409         ed = ed->ed_prev;
0410 
0411     /* dump a snapshot of the bulk or control schedule */
0412     while (ed) {
0413         u32     info = hc32_to_cpu (ohci, ed->hwINFO);
0414         u32     headp = hc32_to_cpu (ohci, ed->hwHeadP);
0415         struct list_head *entry;
0416         struct td   *td;
0417 
0418         temp = scnprintf (buf, size,
0419             "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
0420             ed,
0421             (info & ED_LOWSPEED) ? 'l' : 'f',
0422             info & 0x7f,
0423             (info >> 7) & 0xf,
0424             (info & ED_IN) ? "in" : "out",
0425             0x03ff & (info >> 16),
0426             info,
0427             (info & ED_SKIP) ? " s" : "",
0428             (headp & ED_H) ? " H" : "",
0429             (headp & ED_C) ? data1 : data0);
0430         size -= temp;
0431         buf += temp;
0432 
0433         list_for_each (entry, &ed->td_list) {
0434             u32     cbp, be;
0435 
0436             td = list_entry (entry, struct td, td_list);
0437             info = hc32_to_cpup (ohci, &td->hwINFO);
0438             cbp = hc32_to_cpup (ohci, &td->hwCBP);
0439             be = hc32_to_cpup (ohci, &td->hwBE);
0440             temp = scnprintf (buf, size,
0441                     "\n\ttd %p %s %d cc=%x urb %p (%08x)",
0442                     td,
0443                     ({ char *pid;
0444                     switch (info & TD_DP) {
0445                     case TD_DP_SETUP: pid = "setup"; break;
0446                     case TD_DP_IN: pid = "in"; break;
0447                     case TD_DP_OUT: pid = "out"; break;
0448                     default: pid = "(?)"; break;
0449                      } pid;}),
0450                     cbp ? (be + 1 - cbp) : 0,
0451                     TD_CC_GET (info), td->urb, info);
0452             size -= temp;
0453             buf += temp;
0454         }
0455 
0456         temp = scnprintf (buf, size, "\n");
0457         size -= temp;
0458         buf += temp;
0459 
0460         ed = ed->ed_next;
0461     }
0462     return count - size;
0463 }
0464 
0465 static ssize_t fill_async_buffer(struct debug_buffer *buf)
0466 {
0467     struct ohci_hcd     *ohci;
0468     size_t          temp, size;
0469     unsigned long       flags;
0470 
0471     ohci = buf->ohci;
0472     size = PAGE_SIZE;
0473 
0474     /* display control and bulk lists together, for simplicity */
0475     spin_lock_irqsave (&ohci->lock, flags);
0476     temp = show_list(ohci, buf->page, size, ohci->ed_controltail);
0477     temp += show_list(ohci, buf->page + temp, size - temp,
0478               ohci->ed_bulktail);
0479     spin_unlock_irqrestore (&ohci->lock, flags);
0480 
0481     return temp;
0482 }
0483 
0484 #define DBG_SCHED_LIMIT 64
0485 
0486 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
0487 {
0488     struct ohci_hcd     *ohci;
0489     struct ed       **seen, *ed;
0490     unsigned long       flags;
0491     unsigned        temp, size, seen_count;
0492     char            *next;
0493     unsigned        i;
0494 
0495     seen = kmalloc_array(DBG_SCHED_LIMIT, sizeof(*seen), GFP_ATOMIC);
0496     if (!seen)
0497         return 0;
0498     seen_count = 0;
0499 
0500     ohci = buf->ohci;
0501     next = buf->page;
0502     size = PAGE_SIZE;
0503 
0504     temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
0505     size -= temp;
0506     next += temp;
0507 
0508     /* dump a snapshot of the periodic schedule (and load) */
0509     spin_lock_irqsave (&ohci->lock, flags);
0510     for (i = 0; i < NUM_INTS; i++) {
0511         ed = ohci->periodic[i];
0512         if (!ed)
0513             continue;
0514 
0515         temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
0516         size -= temp;
0517         next += temp;
0518 
0519         do {
0520             temp = scnprintf (next, size, " ed%d/%p",
0521                 ed->interval, ed);
0522             size -= temp;
0523             next += temp;
0524             for (temp = 0; temp < seen_count; temp++) {
0525                 if (seen [temp] == ed)
0526                     break;
0527             }
0528 
0529             /* show more info the first time around */
0530             if (temp == seen_count) {
0531                 u32 info = hc32_to_cpu (ohci, ed->hwINFO);
0532                 struct list_head    *entry;
0533                 unsigned        qlen = 0;
0534 
0535                 /* qlen measured here in TDs, not urbs */
0536                 list_for_each (entry, &ed->td_list)
0537                     qlen++;
0538 
0539                 temp = scnprintf (next, size,
0540                     " (%cs dev%d ep%d%s-%s qlen %u"
0541                     " max %d %08x%s%s)",
0542                     (info & ED_LOWSPEED) ? 'l' : 'f',
0543                     info & 0x7f,
0544                     (info >> 7) & 0xf,
0545                     (info & ED_IN) ? "in" : "out",
0546                     (info & ED_ISO) ? "iso" : "int",
0547                     qlen,
0548                     0x03ff & (info >> 16),
0549                     info,
0550                     (info & ED_SKIP) ? " K" : "",
0551                     (ed->hwHeadP &
0552                         cpu_to_hc32(ohci, ED_H)) ?
0553                             " H" : "");
0554                 size -= temp;
0555                 next += temp;
0556 
0557                 if (seen_count < DBG_SCHED_LIMIT)
0558                     seen [seen_count++] = ed;
0559 
0560                 ed = ed->ed_next;
0561 
0562             } else {
0563                 /* we've seen it and what's after */
0564                 temp = 0;
0565                 ed = NULL;
0566             }
0567 
0568         } while (ed);
0569 
0570         temp = scnprintf (next, size, "\n");
0571         size -= temp;
0572         next += temp;
0573     }
0574     spin_unlock_irqrestore (&ohci->lock, flags);
0575     kfree (seen);
0576 
0577     return PAGE_SIZE - size;
0578 }
0579 #undef DBG_SCHED_LIMIT
0580 
0581 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
0582 {
0583     struct usb_hcd      *hcd;
0584     struct ohci_hcd     *ohci;
0585     struct ohci_regs __iomem *regs;
0586     unsigned long       flags;
0587     unsigned        temp, size;
0588     char            *next;
0589     u32         rdata;
0590 
0591     ohci = buf->ohci;
0592     hcd = ohci_to_hcd(ohci);
0593     regs = ohci->regs;
0594     next = buf->page;
0595     size = PAGE_SIZE;
0596 
0597     spin_lock_irqsave (&ohci->lock, flags);
0598 
0599     /* dump driver info, then registers in spec order */
0600 
0601     ohci_dbg_nosw(ohci, &next, &size,
0602         "bus %s, device %s\n"
0603         "%s\n"
0604         "%s\n",
0605         hcd->self.controller->bus->name,
0606         dev_name(hcd->self.controller),
0607         hcd->product_desc,
0608         hcd_name);
0609 
0610     if (!HCD_HW_ACCESSIBLE(hcd)) {
0611         size -= scnprintf (next, size,
0612             "SUSPENDED (no register access)\n");
0613         goto done;
0614     }
0615 
0616     ohci_dump_status(ohci, &next, &size);
0617 
0618     /* hcca */
0619     if (ohci->hcca)
0620         ohci_dbg_nosw(ohci, &next, &size,
0621             "hcca frame 0x%04x\n", ohci_frame_no(ohci));
0622 
0623     /* other registers mostly affect frame timings */
0624     rdata = ohci_readl (ohci, &regs->fminterval);
0625     temp = scnprintf (next, size,
0626             "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
0627             rdata, (rdata >> 31) ? "FIT " : "",
0628             (rdata >> 16) & 0xefff, rdata & 0xffff);
0629     size -= temp;
0630     next += temp;
0631 
0632     rdata = ohci_readl (ohci, &regs->fmremaining);
0633     temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
0634             rdata, (rdata >> 31) ? "FRT " : "",
0635             rdata & 0x3fff);
0636     size -= temp;
0637     next += temp;
0638 
0639     rdata = ohci_readl (ohci, &regs->periodicstart);
0640     temp = scnprintf (next, size, "periodicstart 0x%04x\n",
0641             rdata & 0x3fff);
0642     size -= temp;
0643     next += temp;
0644 
0645     rdata = ohci_readl (ohci, &regs->lsthresh);
0646     temp = scnprintf (next, size, "lsthresh 0x%04x\n",
0647             rdata & 0x3fff);
0648     size -= temp;
0649     next += temp;
0650 
0651     temp = scnprintf (next, size, "hub poll timer %s\n",
0652             HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off");
0653     size -= temp;
0654     next += temp;
0655 
0656     /* roothub */
0657     ohci_dump_roothub (ohci, 1, &next, &size);
0658 
0659 done:
0660     spin_unlock_irqrestore (&ohci->lock, flags);
0661 
0662     return PAGE_SIZE - size;
0663 }
0664 
0665 static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci,
0666                 ssize_t (*fill_func)(struct debug_buffer *))
0667 {
0668     struct debug_buffer *buf;
0669 
0670     buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
0671 
0672     if (buf) {
0673         buf->ohci = ohci;
0674         buf->fill_func = fill_func;
0675         mutex_init(&buf->mutex);
0676     }
0677 
0678     return buf;
0679 }
0680 
0681 static int fill_buffer(struct debug_buffer *buf)
0682 {
0683     int ret;
0684 
0685     if (!buf->page)
0686         buf->page = (char *)get_zeroed_page(GFP_KERNEL);
0687 
0688     if (!buf->page) {
0689         ret = -ENOMEM;
0690         goto out;
0691     }
0692 
0693     ret = buf->fill_func(buf);
0694 
0695     if (ret >= 0) {
0696         buf->count = ret;
0697         ret = 0;
0698     }
0699 
0700 out:
0701     return ret;
0702 }
0703 
0704 static ssize_t debug_output(struct file *file, char __user *user_buf,
0705             size_t len, loff_t *offset)
0706 {
0707     struct debug_buffer *buf = file->private_data;
0708     int ret;
0709 
0710     mutex_lock(&buf->mutex);
0711     if (buf->count == 0) {
0712         ret = fill_buffer(buf);
0713         if (ret != 0) {
0714             mutex_unlock(&buf->mutex);
0715             goto out;
0716         }
0717     }
0718     mutex_unlock(&buf->mutex);
0719 
0720     ret = simple_read_from_buffer(user_buf, len, offset,
0721                       buf->page, buf->count);
0722 
0723 out:
0724     return ret;
0725 
0726 }
0727 
0728 static int debug_close(struct inode *inode, struct file *file)
0729 {
0730     struct debug_buffer *buf = file->private_data;
0731 
0732     if (buf) {
0733         if (buf->page)
0734             free_page((unsigned long)buf->page);
0735         kfree(buf);
0736     }
0737 
0738     return 0;
0739 }
0740 static int debug_async_open(struct inode *inode, struct file *file)
0741 {
0742     file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
0743 
0744     return file->private_data ? 0 : -ENOMEM;
0745 }
0746 
0747 static int debug_periodic_open(struct inode *inode, struct file *file)
0748 {
0749     file->private_data = alloc_buffer(inode->i_private,
0750                       fill_periodic_buffer);
0751 
0752     return file->private_data ? 0 : -ENOMEM;
0753 }
0754 
0755 static int debug_registers_open(struct inode *inode, struct file *file)
0756 {
0757     file->private_data = alloc_buffer(inode->i_private,
0758                       fill_registers_buffer);
0759 
0760     return file->private_data ? 0 : -ENOMEM;
0761 }
0762 static inline void create_debug_files (struct ohci_hcd *ohci)
0763 {
0764     struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
0765     struct dentry *root;
0766 
0767     root = debugfs_create_dir(bus->bus_name, ohci_debug_root);
0768     ohci->debug_dir = root;
0769 
0770     debugfs_create_file("async", S_IRUGO, root, ohci, &debug_async_fops);
0771     debugfs_create_file("periodic", S_IRUGO, root, ohci,
0772                 &debug_periodic_fops);
0773     debugfs_create_file("registers", S_IRUGO, root, ohci,
0774                 &debug_registers_fops);
0775 
0776     ohci_dbg (ohci, "created debug files\n");
0777 }
0778 
0779 static inline void remove_debug_files (struct ohci_hcd *ohci)
0780 {
0781     debugfs_remove_recursive(ohci->debug_dir);
0782 }
0783 
0784 /*-------------------------------------------------------------------------*/
0785
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