Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 707 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-dbg.c b/drivers/usb/host/ohci-dbg.c
new file mode 100644
index 000000000000..62f53a213808
--- /dev/null
+++ b/drivers/usb/host/ohci-dbg.c
@@ -0,0 +1,707 @@
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ *
+ * This file is licenced under the GPL.
+ */
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef DEBUG
+
+#define edstring(ed_type) ({ char *temp; \
+        switch (ed_type) { \
+        case PIPE_CONTROL:      temp = "ctrl"; break; \
+        case PIPE_BULK:         temp = "bulk"; break; \
+        case PIPE_INTERRUPT:    temp = "intr"; break; \
+        default:                temp = "isoc"; break; \
+        }; temp;})
+#define pipestring(pipe) edstring(usb_pipetype(pipe))
+
+/* debug| print the main components of an URB
+ * small: 0) header + data packets 1) just header
+ */
+static void __attribute__((unused))
+urb_print (struct urb * urb, char * str, int small)
+{
+        unsigned int pipe= urb->pipe;
+
+        if (!urb->dev || !urb->dev->bus) {
+                dbg("%s URB: no dev", str);
+                return;
+        }
+
+#ifndef OHCI_VERBOSE_DEBUG
+        if (urb->status != 0)
+#endif
+        dbg("%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d stat=%d",
+                    str,
+                    urb,
+                    usb_pipedevice (pipe),
+                    usb_pipeendpoint (pipe),
+                    usb_pipeout (pipe)? "out" : "in",
+                    pipestring (pipe),
+                    urb->transfer_flags,
+                    urb->actual_length,
+                    urb->transfer_buffer_length,
+                    urb->status);
+
+#ifdef  OHCI_VERBOSE_DEBUG
+        if (!small) {
+                int i, len;
+
+                if (usb_pipecontrol (pipe)) {
+                        printk (KERN_DEBUG __FILE__ ": setup(8):");
+                        for (i = 0; i < 8 ; i++)
+                                printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
+                        printk ("\n");
+                }
+                if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
+                        printk (KERN_DEBUG __FILE__ ": data(%d/%d):",
+                                urb->actual_length,
+                                urb->transfer_buffer_length);
+                        len = usb_pipeout (pipe)?
+                                                urb->transfer_buffer_length: urb->actual_length;
+                        for (i = 0; i < 16 && i < len; i++)
+                                printk (" %02x", ((__u8 *) urb->transfer_buffer) [i]);
+                        printk ("%s stat:%d\n", i < len? "...": "", urb->status);
+                }
+        }
+#endif
+}
+
+#define ohci_dbg_sw(ohci, next, size, format, arg...) \
+        do { \
+        if (next) { \
+                unsigned s_len; \
+                s_len = scnprintf (*next, *size, format, ## arg ); \
+                *size -= s_len; *next += s_len; \
+        } else \
+                ohci_dbg(ohci,format, ## arg ); \
+        } while (0);
+
+
+static void ohci_dump_intr_mask (
+        struct ohci_hcd *ohci,
+        char *label,
+        u32 mask,
+        char **next,
+        unsigned *size)
+{
+        ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
+                label,
+                mask,
+                (mask & OHCI_INTR_MIE) ? " MIE" : "",
+                (mask & OHCI_INTR_OC) ? " OC" : "",
+                (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
+                (mask & OHCI_INTR_FNO) ? " FNO" : "",
+                (mask & OHCI_INTR_UE) ? " UE" : "",
+                (mask & OHCI_INTR_RD) ? " RD" : "",
+                (mask & OHCI_INTR_SF) ? " SF" : "",
+                (mask & OHCI_INTR_WDH) ? " WDH" : "",
+                (mask & OHCI_INTR_SO) ? " SO" : ""
+                );
+}
+
+static void maybe_print_eds (
+        struct ohci_hcd *ohci,
+        char *label,
+        u32 value,
+        char **next,
+        unsigned *size)
+{
+        if (value)
+                ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
+}
+
+static char *hcfs2string (int state)
+{
+        switch (state) {
+                case OHCI_USB_RESET:    return "reset";
+                case OHCI_USB_RESUME:   return "resume";
+                case OHCI_USB_OPER:     return "operational";
+                case OHCI_USB_SUSPEND:  return "suspend";
+        }
+        return "?";
+}
+
+// dump control and status registers
+static void
+ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
+{
+        struct ohci_regs __iomem *regs = controller->regs;
+        u32                     temp;
+
+        temp = ohci_readl (controller, &regs->revision) & 0xff;
+        ohci_dbg_sw (controller, next, size,
+                "OHCI %d.%d, %s legacy support registers\n",
+                0x03 & (temp >> 4), (temp & 0x0f),
+                (temp & 0x0100) ? "with" : "NO");
+
+        temp = ohci_readl (controller, &regs->control);
+        ohci_dbg_sw (controller, next, size,
+                "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
+                temp,
+                (temp & OHCI_CTRL_RWE) ? " RWE" : "",
+                (temp & OHCI_CTRL_RWC) ? " RWC" : "",
+                (temp & OHCI_CTRL_IR) ? " IR" : "",
+                hcfs2string (temp & OHCI_CTRL_HCFS),
+                (temp & OHCI_CTRL_BLE) ? " BLE" : "",
+                (temp & OHCI_CTRL_CLE) ? " CLE" : "",
+                (temp & OHCI_CTRL_IE) ? " IE" : "",
+                (temp & OHCI_CTRL_PLE) ? " PLE" : "",
+                temp & OHCI_CTRL_CBSR
+                );
+
+        temp = ohci_readl (controller, &regs->cmdstatus);
+        ohci_dbg_sw (controller, next, size,
+                "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
+                (temp & OHCI_SOC) >> 16,
+                (temp & OHCI_OCR) ? " OCR" : "",
+                (temp & OHCI_BLF) ? " BLF" : "",
+                (temp & OHCI_CLF) ? " CLF" : "",
+                (temp & OHCI_HCR) ? " HCR" : ""
+                );
+
+        ohci_dump_intr_mask (controller, "intrstatus",
+                        ohci_readl (controller, &regs->intrstatus),
+                        next, size);
+        ohci_dump_intr_mask (controller, "intrenable",
+                        ohci_readl (controller, &regs->intrenable),
+                        next, size);
+        // intrdisable always same as intrenable
+
+        maybe_print_eds (controller, "ed_periodcurrent",
+                        ohci_readl (controller, &regs->ed_periodcurrent),
+                        next, size);
+
+        maybe_print_eds (controller, "ed_controlhead",
+                        ohci_readl (controller, &regs->ed_controlhead),
+                        next, size);
+        maybe_print_eds (controller, "ed_controlcurrent",
+                        ohci_readl (controller, &regs->ed_controlcurrent),
+                        next, size);
+
+        maybe_print_eds (controller, "ed_bulkhead",
+                        ohci_readl (controller, &regs->ed_bulkhead),
+                        next, size);
+        maybe_print_eds (controller, "ed_bulkcurrent",
+                        ohci_readl (controller, &regs->ed_bulkcurrent),
+                        next, size);
+
+        maybe_print_eds (controller, "donehead",
+                        ohci_readl (controller, &regs->donehead), next, size);
+
+        /* broken fminterval means traffic won't flow! */ 
+        ohci_dbg (controller, "fminterval %08x\n", 
+                        ohci_readl (controller, &regs->fminterval));
+}
+
+#define dbg_port_sw(hc,num,value,next,size) \
+        ohci_dbg_sw (hc, next, size, \
+                "roothub.portstatus [%d] " \
+                "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
+                num, temp, \
+                (temp & RH_PS_PRSC) ? " PRSC" : "", \
+                (temp & RH_PS_OCIC) ? " OCIC" : "", \
+                (temp & RH_PS_PSSC) ? " PSSC" : "", \
+                (temp & RH_PS_PESC) ? " PESC" : "", \
+                (temp & RH_PS_CSC) ? " CSC" : "", \
+                \
+                (temp & RH_PS_LSDA) ? " LSDA" : "", \
+                (temp & RH_PS_PPS) ? " PPS" : "", \
+                (temp & RH_PS_PRS) ? " PRS" : "", \
+                (temp & RH_PS_POCI) ? " POCI" : "", \
+                (temp & RH_PS_PSS) ? " PSS" : "", \
+                \
+                (temp & RH_PS_PES) ? " PES" : "", \
+                (temp & RH_PS_CCS) ? " CCS" : "" \
+                );
+
+
+static void
+ohci_dump_roothub (
+        struct ohci_hcd *controller,
+        int verbose,
+        char **next,
+        unsigned *size)
+{
+        u32                     temp, ndp, i;
+
+        temp = roothub_a (controller);
+        if (temp == ~(u32)0)
+                return;
+        ndp = (temp & RH_A_NDP);
+
+        if (verbose) {
+                ohci_dbg_sw (controller, next, size,
+                        "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d\n", temp,
+                        ((temp & RH_A_POTPGT) >> 24) & 0xff,
+                        (temp & RH_A_NOCP) ? " NOCP" : "",
+                        (temp & RH_A_OCPM) ? " OCPM" : "",
+                        (temp & RH_A_DT) ? " DT" : "",
+                        (temp & RH_A_NPS) ? " NPS" : "",
+                        (temp & RH_A_PSM) ? " PSM" : "",
+                        ndp
+                        );
+                temp = roothub_b (controller);
+                ohci_dbg_sw (controller, next, size,
+                        "roothub.b %08x PPCM=%04x DR=%04x\n",
+                        temp,
+                        (temp & RH_B_PPCM) >> 16,
+                        (temp & RH_B_DR)
+                        );
+                temp = roothub_status (controller);
+                ohci_dbg_sw (controller, next, size,
+                        "roothub.status %08x%s%s%s%s%s%s\n",
+                        temp,
+                        (temp & RH_HS_CRWE) ? " CRWE" : "",
+                        (temp & RH_HS_OCIC) ? " OCIC" : "",
+                        (temp & RH_HS_LPSC) ? " LPSC" : "",
+                        (temp & RH_HS_DRWE) ? " DRWE" : "",
+                        (temp & RH_HS_OCI) ? " OCI" : "",
+                        (temp & RH_HS_LPS) ? " LPS" : ""
+                        );
+        }
+
+        for (i = 0; i < ndp; i++) {
+                temp = roothub_portstatus (controller, i);
+                dbg_port_sw (controller, i, temp, next, size);
+        }
+}
+
+static void ohci_dump (struct ohci_hcd *controller, int verbose)
+{
+        ohci_dbg (controller, "OHCI controller state\n");
+
+        // dumps some of the state we know about
+        ohci_dump_status (controller, NULL, NULL);
+        if (controller->hcca)
+                ohci_dbg (controller,
+                        "hcca frame #%04x\n", ohci_frame_no(controller));
+        ohci_dump_roothub (controller, 1, NULL, NULL);
+}
+
+static const char data0 [] = "DATA0";
+static const char data1 [] = "DATA1";
+
+static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
+                const struct td *td)
+{
+        u32     tmp = hc32_to_cpup (ohci, &td->hwINFO);
+
+        ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
+                label, td,
+                (tmp & TD_DONE) ? " (DONE)" : "",
+                td->urb, td->index,
+                hc32_to_cpup (ohci, &td->hwNextTD));
+        if ((tmp & TD_ISO) == 0) {
+                const char      *toggle, *pid;
+                u32     cbp, be;
+
+                switch (tmp & TD_T) {
+                case TD_T_DATA0: toggle = data0; break;
+                case TD_T_DATA1: toggle = data1; break;
+                case TD_T_TOGGLE: toggle = "(CARRY)"; break;
+                default: toggle = "(?)"; break;
+                }
+                switch (tmp & TD_DP) {
+                case TD_DP_SETUP: pid = "SETUP"; break;
+                case TD_DP_IN: pid = "IN"; break;
+                case TD_DP_OUT: pid = "OUT"; break;
+                default: pid = "(bad pid)"; break;
+                }
+                ohci_dbg (ohci, "     info %08x CC=%x %s DI=%d %s %s\n", tmp,
+                        TD_CC_GET(tmp), /* EC, */ toggle,
+                        (tmp & TD_DI) >> 21, pid,
+                        (tmp & TD_R) ? "R" : "");
+                cbp = hc32_to_cpup (ohci, &td->hwCBP);
+                be = hc32_to_cpup (ohci, &td->hwBE);
+                ohci_dbg (ohci, "     cbp %08x be %08x (len %d)\n", cbp, be,
+                        cbp ? (be + 1 - cbp) : 0);
+        } else {
+                unsigned        i;
+                ohci_dbg (ohci, "  info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
+                        TD_CC_GET(tmp),
+                        (tmp >> 24) & 0x07,
+                        (tmp & TD_DI) >> 21,
+                        tmp & 0x0000ffff);
+                ohci_dbg (ohci, "  bp0 %08x be %08x\n",
+                        hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
+                        hc32_to_cpup (ohci, &td->hwBE));
+                for (i = 0; i < MAXPSW; i++) {
+                        u16     psw = ohci_hwPSW (ohci, td, i);
+                        int     cc = (psw >> 12) & 0x0f;
+                        ohci_dbg (ohci, "    psw [%d] = %2x, CC=%x %s=%d\n", i,
+                                psw, cc,
+                                (cc >= 0x0e) ? "OFFSET" : "SIZE",
+                                psw & 0x0fff);
+                }
+        }
+}
+
+/* caller MUST own hcd spinlock if verbose is set! */
+static void __attribute__((unused))
+ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
+                const struct ed *ed, int verbose)
+{
+        u32     tmp = hc32_to_cpu (ohci, ed->hwINFO);
+        char    *type = "";
+
+        ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
+                label,
+                ed, ed->state, edstring (ed->type),
+                hc32_to_cpup (ohci, &ed->hwNextED));
+        switch (tmp & (ED_IN|ED_OUT)) {
+        case ED_OUT: type = "-OUT"; break;
+        case ED_IN: type = "-IN"; break;
+        /* else from TDs ... control */
+        }
+        ohci_dbg (ohci,
+                "  info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
+                0x03ff & (tmp >> 16),
+                (tmp & ED_DEQUEUE) ? " DQ" : "",
+                (tmp & ED_ISO) ? " ISO" : "",
+                (tmp & ED_SKIP) ? " SKIP" : "",
+                (tmp & ED_LOWSPEED) ? " LOW" : "",
+                0x000f & (tmp >> 7),
+                type,
+                0x007f & tmp);
+        tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
+        ohci_dbg (ohci, "  tds: head %08x %s%s tail %08x%s\n",
+                tmp,
+                (tmp & ED_C) ? data1 : data0,
+                (tmp & ED_H) ? " HALT" : "",
+                hc32_to_cpup (ohci, &ed->hwTailP),
+                verbose ? "" : " (not listing)");
+        if (verbose) {
+                struct list_head        *tmp;
+
+                /* use ed->td_list because HC concurrently modifies
+                 * hwNextTD as it accumulates ed_donelist.
+                 */
+                list_for_each (tmp, &ed->td_list) {
+                        struct td               *td;
+                        td = list_entry (tmp, struct td, td_list);
+                        ohci_dump_td (ohci, "  ->", td);
+                }
+        }
+}
+
+#else
+static inline void ohci_dump (struct ohci_hcd *controller, int verbose) {}
+
+#undef OHCI_VERBOSE_DEBUG
+
+#endif /* DEBUG */
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef STUB_DEBUG_FILES
+
+static inline void create_debug_files (struct ohci_hcd *bus) { }
+static inline void remove_debug_files (struct ohci_hcd *bus) { }
+
+#else
+
+static ssize_t
+show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
+{
+        unsigned                temp, size = count;
+
+        if (!ed)
+                return 0;
+
+        /* print first --> last */
+        while (ed->ed_prev)
+                ed = ed->ed_prev;
+
+        /* dump a snapshot of the bulk or control schedule */
+        while (ed) {
+                u32             info = hc32_to_cpu (ohci, ed->hwINFO);
+                u32             headp = hc32_to_cpu (ohci, ed->hwHeadP);
+                struct list_head *entry;
+                struct td       *td;
+
+                temp = scnprintf (buf, size,
+                        "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
+                        ed,
+                        (info & ED_LOWSPEED) ? 'l' : 'f',
+                        info & 0x7f,
+                        (info >> 7) & 0xf,
+                        (info & ED_IN) ? "in" : "out",
+                        0x03ff & (info >> 16),
+                        info,
+                        (info & ED_SKIP) ? " s" : "",
+                        (headp & ED_H) ? " H" : "",
+                        (headp & ED_C) ? data1 : data0);
+                size -= temp;
+                buf += temp;
+
+                list_for_each (entry, &ed->td_list) {
+                        u32             cbp, be;
+
+                        td = list_entry (entry, struct td, td_list);
+                        info = hc32_to_cpup (ohci, &td->hwINFO);
+                        cbp = hc32_to_cpup (ohci, &td->hwCBP);
+                        be = hc32_to_cpup (ohci, &td->hwBE);
+                        temp = scnprintf (buf, size,
+                                        "\n\ttd %p %s %d cc=%x urb %p (%08x)",
+                                        td,
+                                        ({ char *pid;
+                                        switch (info & TD_DP) {
+                                        case TD_DP_SETUP: pid = "setup"; break;
+                                        case TD_DP_IN: pid = "in"; break;
+                                        case TD_DP_OUT: pid = "out"; break;
+                                        default: pid = "(?)"; break;
+                                         } pid;}),
+                                        cbp ? (be + 1 - cbp) : 0,
+                                        TD_CC_GET (info), td->urb, info);
+                        size -= temp;
+                        buf += temp;
+                }
+
+                temp = scnprintf (buf, size, "\n");
+                size -= temp;
+                buf += temp;
+
+                ed = ed->ed_next;
+        }
+        return count - size;
+}
+
+static ssize_t
+show_async (struct class_device *class_dev, char *buf)
+{
+        struct usb_bus          *bus;
+        struct usb_hcd          *hcd;
+        struct ohci_hcd         *ohci;
+        size_t                  temp;
+        unsigned long           flags;
+
+        bus = to_usb_bus(class_dev);
+        hcd = bus->hcpriv;
+        ohci = hcd_to_ohci(hcd);
+
+        /* display control and bulk lists together, for simplicity */
+        spin_lock_irqsave (&ohci->lock, flags);
+        temp = show_list (ohci, buf, PAGE_SIZE, ohci->ed_controltail);
+        temp += show_list (ohci, buf + temp, PAGE_SIZE - temp, ohci->ed_bulktail);
+        spin_unlock_irqrestore (&ohci->lock, flags);
+
+        return temp;
+}
+static CLASS_DEVICE_ATTR (async, S_IRUGO, show_async, NULL);
+
+
+#define DBG_SCHED_LIMIT 64
+
+static ssize_t
+show_periodic (struct class_device *class_dev, char *buf)
+{
+        struct usb_bus          *bus;
+        struct usb_hcd          *hcd;
+        struct ohci_hcd         *ohci;
+        struct ed               **seen, *ed;
+        unsigned long           flags;
+        unsigned                temp, size, seen_count;
+        char                    *next;
+        unsigned                i;
+
+        if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, SLAB_ATOMIC)))
+                return 0;
+        seen_count = 0;
+
+        bus = to_usb_bus(class_dev);
+        hcd = bus->hcpriv;
+        ohci = hcd_to_ohci(hcd);
+        next = buf;
+        size = PAGE_SIZE;
+
+        temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
+        size -= temp;
+        next += temp;
+
+        /* dump a snapshot of the periodic schedule (and load) */
+        spin_lock_irqsave (&ohci->lock, flags);
+        for (i = 0; i < NUM_INTS; i++) {
+                if (!(ed = ohci->periodic [i]))
+                        continue;
+
+                temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
+                size -= temp;
+                next += temp;
+
+                do {
+                        temp = scnprintf (next, size, " ed%d/%p",
+                                ed->interval, ed);
+                        size -= temp;
+                        next += temp;
+                        for (temp = 0; temp < seen_count; temp++) {
+                                if (seen [temp] == ed)
+                                        break;
+                        }
+
+                        /* show more info the first time around */
+                        if (temp == seen_count) {
+                                u32     info = hc32_to_cpu (ohci, ed->hwINFO);
+                                struct list_head        *entry;
+                                unsigned                qlen = 0;
+
+                                /* qlen measured here in TDs, not urbs */
+                                list_for_each (entry, &ed->td_list)
+                                        qlen++;
+
+                                temp = scnprintf (next, size,
+                                        " (%cs dev%d ep%d%s-%s qlen %u"
+                                        " max %d %08x%s%s)",
+                                        (info & ED_LOWSPEED) ? 'l' : 'f',
+                                        info & 0x7f,
+                                        (info >> 7) & 0xf,
+                                        (info & ED_IN) ? "in" : "out",
+                                        (info & ED_ISO) ? "iso" : "int",
+                                        qlen,
+                                        0x03ff & (info >> 16),
+                                        info,
+                                        (info & ED_SKIP) ? " K" : "",
+                                        (ed->hwHeadP &
+                                                cpu_to_hc32(ohci, ED_H)) ?
+                                                        " H" : "");
+                                size -= temp;
+                                next += temp;
+
+                                if (seen_count < DBG_SCHED_LIMIT)
+                                        seen [seen_count++] = ed;
+
+                                ed = ed->ed_next;
+
+                        } else {
+                                /* we've seen it and what's after */
+                                temp = 0;
+                                ed = NULL;
+                        }
+
+                } while (ed);
+
+                temp = scnprintf (next, size, "\n");
+                size -= temp;
+                next += temp;
+        }
+        spin_unlock_irqrestore (&ohci->lock, flags);
+        kfree (seen);
+
+        return PAGE_SIZE - size;
+}
+static CLASS_DEVICE_ATTR (periodic, S_IRUGO, show_periodic, NULL);
+
+
+#undef DBG_SCHED_LIMIT
+
+static ssize_t
+show_registers (struct class_device *class_dev, char *buf)
+{
+        struct usb_bus          *bus;
+        struct usb_hcd          *hcd;
+        struct ohci_hcd         *ohci;
+        struct ohci_regs __iomem *regs;
+        unsigned long           flags;
+        unsigned                temp, size;
+        char                    *next;
+        u32                     rdata;
+
+        bus = to_usb_bus(class_dev);
+        hcd = bus->hcpriv;
+        ohci = hcd_to_ohci(hcd);
+        regs = ohci->regs;
+        next = buf;
+        size = PAGE_SIZE;
+
+        spin_lock_irqsave (&ohci->lock, flags);
+
+        /* dump driver info, then registers in spec order */
+
+        ohci_dbg_sw (ohci, &next, &size,
+                "bus %s, device %s\n"
+                "%s\n"
+                "%s version " DRIVER_VERSION "\n",
+                hcd->self.controller->bus->name,
+                hcd->self.controller->bus_id,
+                hcd->product_desc,
+                hcd_name);
+
+        if (bus->controller->power.power_state) {
+                size -= scnprintf (next, size,
+                        "SUSPENDED (no register access)\n");
+                goto done;
+        }
+
+        ohci_dump_status(ohci, &next, &size);
+
+        /* hcca */
+        if (ohci->hcca)
+                ohci_dbg_sw (ohci, &next, &size,
+                        "hcca frame 0x%04x\n", ohci_frame_no(ohci));
+
+        /* other registers mostly affect frame timings */
+        rdata = ohci_readl (ohci, &regs->fminterval);
+        temp = scnprintf (next, size,
+                        "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
+                        rdata, (rdata >> 31) ? "FIT " : "",
+                        (rdata >> 16) & 0xefff, rdata & 0xffff);
+        size -= temp;
+        next += temp;
+
+        rdata = ohci_readl (ohci, &regs->fmremaining);
+        temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
+                        rdata, (rdata >> 31) ? "FRT " : "",
+                        rdata & 0x3fff);
+        size -= temp;
+        next += temp;
+
+        rdata = ohci_readl (ohci, &regs->periodicstart);
+        temp = scnprintf (next, size, "periodicstart 0x%04x\n",
+                        rdata & 0x3fff);
+        size -= temp;
+        next += temp;
+
+        rdata = ohci_readl (ohci, &regs->lsthresh);
+        temp = scnprintf (next, size, "lsthresh 0x%04x\n",
+                        rdata & 0x3fff);
+        size -= temp;
+        next += temp;
+
+        /* roothub */
+        ohci_dump_roothub (ohci, 1, &next, &size);
+
+done:
+        spin_unlock_irqrestore (&ohci->lock, flags);
+        return PAGE_SIZE - size;
+}
+static CLASS_DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL);
+
+
+static inline void create_debug_files (struct ohci_hcd *ohci)
+{
+        struct class_device *cldev = &ohci_to_hcd(ohci)->self.class_dev;
+
+        class_device_create_file(cldev, &class_device_attr_async);
+        class_device_create_file(cldev, &class_device_attr_periodic);
+        class_device_create_file(cldev, &class_device_attr_registers);
+        ohci_dbg (ohci, "created debug files\n");
+}
+
+static inline void remove_debug_files (struct ohci_hcd *ohci)
+{
+        struct class_device *cldev = &ohci_to_hcd(ohci)->self.class_dev;
+
+        class_device_remove_file(cldev, &class_device_attr_async);
+        class_device_remove_file(cldev, &class_device_attr_periodic);
+        class_device_remove_file(cldev, &class_device_attr_registers);
+}
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+