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, 755 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
new file mode 100644
index 000000000000..495e2a3ef6f1
--- /dev/null
+++ b/drivers/usb/host/ehci-dbg.c
@@ -0,0 +1,755 @@
+/*
+ * Copyright (c) 2001-2002 by David Brownell
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* this file is part of ehci-hcd.c */
+
+#define ehci_dbg(ehci, fmt, args...) \
+        dev_dbg (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
+#define ehci_err(ehci, fmt, args...) \
+        dev_err (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
+#define ehci_info(ehci, fmt, args...) \
+        dev_info (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
+#define ehci_warn(ehci, fmt, args...) \
+        dev_warn (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
+
+#ifdef EHCI_VERBOSE_DEBUG
+#       define vdbg dbg
+#       define ehci_vdbg ehci_dbg
+#else
+#       define vdbg(fmt,args...) do { } while (0)
+#       define ehci_vdbg(ehci, fmt, args...) do { } while (0)
+#endif
+
+#ifdef  DEBUG
+
+/* check the values in the HCSPARAMS register
+ * (host controller _Structural_ parameters)
+ * see EHCI spec, Table 2-4 for each value
+ */
+static void dbg_hcs_params (struct ehci_hcd *ehci, char *label)
+{
+        u32     params = readl (&ehci->caps->hcs_params);
+
+        ehci_dbg (ehci,
+                "%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
+                label, params,
+                HCS_DEBUG_PORT (params),
+                HCS_INDICATOR (params) ? " ind" : "",
+                HCS_N_CC (params),
+                HCS_N_PCC (params),
+                HCS_PORTROUTED (params) ? "" : " ordered",
+                HCS_PPC (params) ? "" : " !ppc",
+                HCS_N_PORTS (params)
+                );
+        /* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
+        if (HCS_PORTROUTED (params)) {
+                int i;
+                char buf [46], tmp [7], byte;
+
+                buf[0] = 0;
+                for (i = 0; i < HCS_N_PORTS (params); i++) {
+                        // FIXME MIPS won't readb() ...
+                        byte = readb (&ehci->caps->portroute[(i>>1)]);
+                        sprintf(tmp, "%d ", 
+                                ((i & 0x1) ? ((byte)&0xf) : ((byte>>4)&0xf)));
+                        strcat(buf, tmp);
+                }
+                ehci_dbg (ehci, "%s portroute %s\n",
+                                label, buf);
+        }
+}
+#else
+
+static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}
+
+#endif
+
+#ifdef  DEBUG
+
+/* check the values in the HCCPARAMS register
+ * (host controller _Capability_ parameters)
+ * see EHCI Spec, Table 2-5 for each value
+ * */
+static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
+{
+        u32     params = readl (&ehci->caps->hcc_params);
+
+        if (HCC_ISOC_CACHE (params)) {
+                ehci_dbg (ehci,
+                     "%s hcc_params %04x caching frame %s%s%s\n",
+                     label, params,
+                     HCC_PGM_FRAMELISTLEN (params) ? "256/512/1024" : "1024",
+                     HCC_CANPARK (params) ? " park" : "",
+                     HCC_64BIT_ADDR (params) ? " 64 bit addr" : "");
+        } else {
+                ehci_dbg (ehci,
+                     "%s hcc_params %04x thresh %d uframes %s%s%s\n",
+                     label,
+                     params,
+                     HCC_ISOC_THRES (params),
+                     HCC_PGM_FRAMELISTLEN (params) ? "256/512/1024" : "1024",
+                     HCC_CANPARK (params) ? " park" : "",
+                     HCC_64BIT_ADDR (params) ? " 64 bit addr" : "");
+        }
+}
+#else
+
+static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}
+
+#endif
+
+#ifdef  DEBUG
+
+static void __attribute__((__unused__))
+dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
+{
+        ehci_dbg (ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
+                le32_to_cpup (&qtd->hw_next),
+                le32_to_cpup (&qtd->hw_alt_next),
+                le32_to_cpup (&qtd->hw_token),
+                le32_to_cpup (&qtd->hw_buf [0]));
+        if (qtd->hw_buf [1])
+                ehci_dbg (ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
+                        le32_to_cpup (&qtd->hw_buf [1]),
+                        le32_to_cpup (&qtd->hw_buf [2]),
+                        le32_to_cpup (&qtd->hw_buf [3]),
+                        le32_to_cpup (&qtd->hw_buf [4]));
+}
+
+static void __attribute__((__unused__))
+dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+        ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
+                qh, qh->hw_next, qh->hw_info1, qh->hw_info2,
+                qh->hw_current);
+        dbg_qtd ("overlay", ehci, (struct ehci_qtd *) &qh->hw_qtd_next);
+}
+
+static void __attribute__((__unused__))
+dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd) 
+{
+        ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n",
+                label, itd->frame, itd, le32_to_cpu(itd->hw_next), itd->urb);
+        ehci_dbg (ehci,
+                "  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n", 
+                le32_to_cpu(itd->hw_transaction[0]),
+                le32_to_cpu(itd->hw_transaction[1]),
+                le32_to_cpu(itd->hw_transaction[2]),
+                le32_to_cpu(itd->hw_transaction[3]),
+                le32_to_cpu(itd->hw_transaction[4]),
+                le32_to_cpu(itd->hw_transaction[5]),
+                le32_to_cpu(itd->hw_transaction[6]),
+                le32_to_cpu(itd->hw_transaction[7]));
+        ehci_dbg (ehci,
+                "  buf:   %08x %08x %08x %08x %08x %08x %08x\n", 
+                le32_to_cpu(itd->hw_bufp[0]),
+                le32_to_cpu(itd->hw_bufp[1]),
+                le32_to_cpu(itd->hw_bufp[2]),
+                le32_to_cpu(itd->hw_bufp[3]),
+                le32_to_cpu(itd->hw_bufp[4]),
+                le32_to_cpu(itd->hw_bufp[5]),
+                le32_to_cpu(itd->hw_bufp[6]));
+        ehci_dbg (ehci, "  index: %d %d %d %d %d %d %d %d\n",
+                itd->index[0], itd->index[1], itd->index[2],
+                itd->index[3], itd->index[4], itd->index[5],
+                itd->index[6], itd->index[7]);
+}
+
+static void __attribute__((__unused__))
+dbg_sitd (const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd) 
+{
+        ehci_dbg (ehci, "%s [%d] sitd %p, next %08x, urb %p\n",
+                label, sitd->frame, sitd, le32_to_cpu(sitd->hw_next), sitd->urb);
+        ehci_dbg (ehci,
+                "  addr %08x sched %04x result %08x buf %08x %08x\n", 
+                le32_to_cpu(sitd->hw_fullspeed_ep),
+                le32_to_cpu(sitd->hw_uframe),
+                le32_to_cpu(sitd->hw_results),
+                le32_to_cpu(sitd->hw_buf [0]),
+                le32_to_cpu(sitd->hw_buf [1]));
+}
+
+static int __attribute__((__unused__))
+dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
+{
+        return scnprintf (buf, len,
+                "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
+                label, label [0] ? " " : "", status,
+                (status & STS_ASS) ? " Async" : "",
+                (status & STS_PSS) ? " Periodic" : "",
+                (status & STS_RECL) ? " Recl" : "",
+                (status & STS_HALT) ? " Halt" : "",
+                (status & STS_IAA) ? " IAA" : "",
+                (status & STS_FATAL) ? " FATAL" : "",
+                (status & STS_FLR) ? " FLR" : "",
+                (status & STS_PCD) ? " PCD" : "",
+                (status & STS_ERR) ? " ERR" : "",
+                (status & STS_INT) ? " INT" : ""
+                );
+}
+
+static int __attribute__((__unused__))
+dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
+{
+        return scnprintf (buf, len,
+                "%s%sintrenable %02x%s%s%s%s%s%s",
+                label, label [0] ? " " : "", enable,
+                (enable & STS_IAA) ? " IAA" : "",
+                (enable & STS_FATAL) ? " FATAL" : "",
+                (enable & STS_FLR) ? " FLR" : "",
+                (enable & STS_PCD) ? " PCD" : "",
+                (enable & STS_ERR) ? " ERR" : "",
+                (enable & STS_INT) ? " INT" : ""
+                );
+}
+
+static const char *const fls_strings [] =
+    { "1024", "512", "256", "??" };
+
+static int
+dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
+{
+        return scnprintf (buf, len,
+                "%s%scommand %06x %s=%d ithresh=%d%s%s%s%s period=%s%s %s",
+                label, label [0] ? " " : "", command,
+                (command & CMD_PARK) ? "park" : "(park)",
+                CMD_PARK_CNT (command),
+                (command >> 16) & 0x3f,
+                (command & CMD_LRESET) ? " LReset" : "",
+                (command & CMD_IAAD) ? " IAAD" : "",
+                (command & CMD_ASE) ? " Async" : "",
+                (command & CMD_PSE) ? " Periodic" : "",
+                fls_strings [(command >> 2) & 0x3],
+                (command & CMD_RESET) ? " Reset" : "",
+                (command & CMD_RUN) ? "RUN" : "HALT"
+                );
+}
+
+static int
+dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
+{
+        char    *sig;
+
+        /* signaling state */
+        switch (status & (3 << 10)) {
+        case 0 << 10: sig = "se0"; break;
+        case 1 << 10: sig = "k"; break;         /* low speed */
+        case 2 << 10: sig = "j"; break;
+        default: sig = "?"; break;
+        }
+
+        return scnprintf (buf, len,
+                "%s%sport %d status %06x%s%s sig=%s %s%s%s%s%s%s%s%s%s",
+                label, label [0] ? " " : "", port, status,
+                (status & PORT_POWER) ? " POWER" : "",
+                (status & PORT_OWNER) ? " OWNER" : "",
+                sig,
+                (status & PORT_RESET) ? " RESET" : "",
+                (status & PORT_SUSPEND) ? " SUSPEND" : "",
+                (status & PORT_RESUME) ? " RESUME" : "",
+                (status & PORT_OCC) ? " OCC" : "",
+                (status & PORT_OC) ? " OC" : "",
+                (status & PORT_PEC) ? " PEC" : "",
+                (status & PORT_PE) ? " PE" : "",
+                (status & PORT_CSC) ? " CSC" : "",
+                (status & PORT_CONNECT) ? " CONNECT" : ""
+            );
+}
+
+#else
+static inline void __attribute__((__unused__))
+dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
+{}
+
+static inline int __attribute__((__unused__))
+dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
+{ return 0; }
+
+static inline int __attribute__((__unused__))
+dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
+{ return 0; }
+
+static inline int __attribute__((__unused__))
+dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
+{ return 0; }
+
+static inline int __attribute__((__unused__))
+dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
+{ return 0; }
+
+#endif  /* DEBUG */
+
+/* functions have the "wrong" filename when they're output... */
+#define dbg_status(ehci, label, status) { \
+        char _buf [80]; \
+        dbg_status_buf (_buf, sizeof _buf, label, status); \
+        ehci_dbg (ehci, "%s\n", _buf); \
+}
+
+#define dbg_cmd(ehci, label, command) { \
+        char _buf [80]; \
+        dbg_command_buf (_buf, sizeof _buf, label, command); \
+        ehci_dbg (ehci, "%s\n", _buf); \
+}
+
+#define dbg_port(ehci, label, port, status) { \
+        char _buf [80]; \
+        dbg_port_buf (_buf, sizeof _buf, label, port, status); \
+        ehci_dbg (ehci, "%s\n", _buf); \
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef STUB_DEBUG_FILES
+
+static inline void create_debug_files (struct ehci_hcd *bus) { }
+static inline void remove_debug_files (struct ehci_hcd *bus) { }
+
+#else
+
+/* troubleshooting help: expose state in driverfs */
+
+#define speed_char(info1) ({ char tmp; \
+                switch (info1 & (3 << 12)) { \
+                case 0 << 12: tmp = 'f'; break; \
+                case 1 << 12: tmp = 'l'; break; \
+                case 2 << 12: tmp = 'h'; break; \
+                default: tmp = '?'; break; \
+                }; tmp; })
+
+static inline char token_mark (__le32 token)
+{
+        __u32 v = le32_to_cpu (token);
+        if (v & QTD_STS_ACTIVE)
+                return '*';
+        if (v & QTD_STS_HALT)
+                return '-';
+        if (!IS_SHORT_READ (v))
+                return ' ';
+        /* tries to advance through hw_alt_next */
+        return '/';
+}
+
+static void qh_lines (
+        struct ehci_hcd *ehci,
+        struct ehci_qh *qh,
+        char **nextp,
+        unsigned *sizep
+)
+{
+        u32                     scratch;
+        u32                     hw_curr;
+        struct list_head        *entry;
+        struct ehci_qtd         *td;
+        unsigned                temp;
+        unsigned                size = *sizep;
+        char                    *next = *nextp;
+        char                    mark;
+
+        if (qh->hw_qtd_next == EHCI_LIST_END)   /* NEC does this */
+                mark = '@';
+        else
+                mark = token_mark (qh->hw_token);
+        if (mark == '/') {      /* qh_alt_next controls qh advance? */
+                if ((qh->hw_alt_next & QTD_MASK) == ehci->async->hw_alt_next)
+                        mark = '#';     /* blocked */
+                else if (qh->hw_alt_next == EHCI_LIST_END)
+                        mark = '.';     /* use hw_qtd_next */
+                /* else alt_next points to some other qtd */
+        }
+        scratch = le32_to_cpup (&qh->hw_info1);
+        hw_curr = (mark == '*') ? le32_to_cpup (&qh->hw_current) : 0;
+        temp = scnprintf (next, size,
+                        "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
+                        qh, scratch & 0x007f,
+                        speed_char (scratch),
+                        (scratch >> 8) & 0x000f,
+                        scratch, le32_to_cpup (&qh->hw_info2),
+                        le32_to_cpup (&qh->hw_token), mark,
+                        (__constant_cpu_to_le32 (QTD_TOGGLE) & qh->hw_token)
+                                ? "data1" : "data0",
+                        (le32_to_cpup (&qh->hw_alt_next) >> 1) & 0x0f);
+        size -= temp;
+        next += temp;
+
+        /* hc may be modifying the list as we read it ... */
+        list_for_each (entry, &qh->qtd_list) {
+                td = list_entry (entry, struct ehci_qtd, qtd_list);
+                scratch = le32_to_cpup (&td->hw_token);
+                mark = ' ';
+                if (hw_curr == td->qtd_dma)
+                        mark = '*';
+                else if (qh->hw_qtd_next == td->qtd_dma)
+                        mark = '+';
+                else if (QTD_LENGTH (scratch)) {
+                        if (td->hw_alt_next == ehci->async->hw_alt_next)
+                                mark = '#';
+                        else if (td->hw_alt_next != EHCI_LIST_END)
+                                mark = '/';
+                }
+                temp = snprintf (next, size,
+                                "\n\t%p%c%s len=%d %08x urb %p",
+                                td, mark, ({ char *tmp;
+                                 switch ((scratch>>8)&0x03) {
+                                 case 0: tmp = "out"; break;
+                                 case 1: tmp = "in"; break;
+                                 case 2: tmp = "setup"; break;
+                                 default: tmp = "?"; break;
+                                 } tmp;}),
+                                (scratch >> 16) & 0x7fff,
+                                scratch,
+                                td->urb);
+                if (temp < 0)
+                        temp = 0;
+                else if (size < temp)
+                        temp = size;
+                size -= temp;
+                next += temp;
+                if (temp == size)
+                        goto done;
+        }
+
+        temp = snprintf (next, size, "\n");
+        if (temp < 0)
+                temp = 0;
+        else if (size < temp)
+                temp = size;
+        size -= temp;
+        next += temp;
+
+done:
+        *sizep = size;
+        *nextp = next;
+}
+
+static ssize_t
+show_async (struct class_device *class_dev, char *buf)
+{
+        struct usb_bus          *bus;
+        struct usb_hcd          *hcd;
+        struct ehci_hcd         *ehci;
+        unsigned long           flags;
+        unsigned                temp, size;
+        char                    *next;
+        struct ehci_qh          *qh;
+
+        *buf = 0;
+
+        bus = to_usb_bus(class_dev);
+        hcd = bus->hcpriv;
+        ehci = hcd_to_ehci (hcd);
+        next = buf;
+        size = PAGE_SIZE;
+
+        /* dumps a snapshot of the async schedule.
+         * usually empty except for long-term bulk reads, or head.
+         * one QH per line, and TDs we know about
+         */
+        spin_lock_irqsave (&ehci->lock, flags);
+        for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
+                qh_lines (ehci, qh, &next, &size);
+        if (ehci->reclaim && size > 0) {
+                temp = scnprintf (next, size, "\nreclaim =\n");
+                size -= temp;
+                next += temp;
+
+                for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
+                        qh_lines (ehci, qh, &next, &size);
+        }
+        spin_unlock_irqrestore (&ehci->lock, flags);
+
+        return strlen (buf);
+}
+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 ehci_hcd         *ehci;
+        unsigned long           flags;
+        union ehci_shadow       p, *seen;
+        unsigned                temp, size, seen_count;
+        char                    *next;
+        unsigned                i;
+        __le32                  tag;
+
+        if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, SLAB_ATOMIC)))
+                return 0;
+        seen_count = 0;
+
+        bus = to_usb_bus(class_dev);
+        hcd = bus->hcpriv;
+        ehci = hcd_to_ehci (hcd);
+        next = buf;
+        size = PAGE_SIZE;
+
+        temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
+        size -= temp;
+        next += temp;
+
+        /* dump a snapshot of the periodic schedule.
+         * iso changes, interrupt usually doesn't.
+         */
+        spin_lock_irqsave (&ehci->lock, flags);
+        for (i = 0; i < ehci->periodic_size; i++) {
+                p = ehci->pshadow [i];
+                if (likely (!p.ptr))
+                        continue;
+                tag = Q_NEXT_TYPE (ehci->periodic [i]);
+
+                temp = scnprintf (next, size, "%4d: ", i);
+                size -= temp;
+                next += temp;
+
+                do {
+                        switch (tag) {
+                        case Q_TYPE_QH:
+                                temp = scnprintf (next, size, " qh%d-%04x/%p",
+                                                p.qh->period,
+                                                le32_to_cpup (&p.qh->hw_info2)
+                                                        /* uframe masks */
+                                                        & 0xffff,
+                                                p.qh);
+                                size -= temp;
+                                next += temp;
+                                /* don't repeat what follows this qh */
+                                for (temp = 0; temp < seen_count; temp++) {
+                                        if (seen [temp].ptr != p.ptr)
+                                                continue;
+                                        if (p.qh->qh_next.ptr)
+                                                temp = scnprintf (next, size,
+                                                        " ...");
+                                        p.ptr = NULL;
+                                        break;
+                                }
+                                /* show more info the first time around */
+                                if (temp == seen_count && p.ptr) {
+                                        u32     scratch = le32_to_cpup (
+                                                        &p.qh->hw_info1);
+                                        struct ehci_qtd *qtd;
+                                        char            *type = "";
+
+                                        /* count tds, get ep direction */
+                                        temp = 0;
+                                        list_for_each_entry (qtd,
+                                                        &p.qh->qtd_list,
+                                                        qtd_list) {
+                                                temp++;
+                                                switch (0x03 & (le32_to_cpu (
+                                                        qtd->hw_token) >> 8)) {
+                                                case 0: type = "out"; continue;
+                                                case 1: type = "in"; continue;
+                                                }
+                                        }
+
+                                        temp = scnprintf (next, size,
+                                                " (%c%d ep%d%s "
+                                                "[%d/%d] q%d p%d)",
+                                                speed_char (scratch),
+                                                scratch & 0x007f,
+                                                (scratch >> 8) & 0x000f, type,
+                                                p.qh->usecs, p.qh->c_usecs,
+                                                temp,
+                                                0x7ff & (scratch >> 16));
+
+                                        if (seen_count < DBG_SCHED_LIMIT)
+                                                seen [seen_count++].qh = p.qh;
+                                } else
+                                        temp = 0;
+                                if (p.qh) {
+                                        tag = Q_NEXT_TYPE (p.qh->hw_next);
+                                        p = p.qh->qh_next;
+                                }
+                                break;
+                        case Q_TYPE_FSTN:
+                                temp = scnprintf (next, size,
+                                        " fstn-%8x/%p", p.fstn->hw_prev,
+                                        p.fstn);
+                                tag = Q_NEXT_TYPE (p.fstn->hw_next);
+                                p = p.fstn->fstn_next;
+                                break;
+                        case Q_TYPE_ITD:
+                                temp = scnprintf (next, size,
+                                        " itd/%p", p.itd);
+                                tag = Q_NEXT_TYPE (p.itd->hw_next);
+                                p = p.itd->itd_next;
+                                break;
+                        case Q_TYPE_SITD:
+                                temp = scnprintf (next, size,
+                                        " sitd%d-%04x/%p",
+                                        p.sitd->stream->interval,
+                                        le32_to_cpup (&p.sitd->hw_uframe)
+                                                & 0x0000ffff,
+                                        p.sitd);
+                                tag = Q_NEXT_TYPE (p.sitd->hw_next);
+                                p = p.sitd->sitd_next;
+                                break;
+                        }
+                        size -= temp;
+                        next += temp;
+                } while (p.ptr);
+
+                temp = scnprintf (next, size, "\n");
+                size -= temp;
+                next += temp;
+        }
+        spin_unlock_irqrestore (&ehci->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 ehci_hcd         *ehci;
+        unsigned long           flags;
+        unsigned                temp, size, i;
+        char                    *next, scratch [80];
+        static char             fmt [] = "%*s\n";
+        static char             label [] = "";
+
+        bus = to_usb_bus(class_dev);
+        hcd = bus->hcpriv;
+        ehci = hcd_to_ehci (hcd);
+        next = buf;
+        size = PAGE_SIZE;
+
+        spin_lock_irqsave (&ehci->lock, flags);
+
+        if (bus->controller->power.power_state) {
+                size = scnprintf (next, size,
+                        "bus %s, device %s (driver " DRIVER_VERSION ")\n"
+                        "SUSPENDED (no register access)\n",
+                        hcd->self.controller->bus->name,
+                        hcd->self.controller->bus_id);
+                goto done;
+        }
+
+        /* Capability Registers */
+        i = HC_VERSION(readl (&ehci->caps->hc_capbase));
+        temp = scnprintf (next, size,
+                "bus %s, device %s (driver " DRIVER_VERSION ")\n"
+                "EHCI %x.%02x, hcd state %d\n",
+                hcd->self.controller->bus->name,
+                hcd->self.controller->bus_id,
+                i >> 8, i & 0x0ff, hcd->state);
+        size -= temp;
+        next += temp;
+
+        // FIXME interpret both types of params
+        i = readl (&ehci->caps->hcs_params);
+        temp = scnprintf (next, size, "structural params 0x%08x\n", i);
+        size -= temp;
+        next += temp;
+
+        i = readl (&ehci->caps->hcc_params);
+        temp = scnprintf (next, size, "capability params 0x%08x\n", i);
+        size -= temp;
+        next += temp;
+
+        /* Operational Registers */
+        temp = dbg_status_buf (scratch, sizeof scratch, label,
+                        readl (&ehci->regs->status));
+        temp = scnprintf (next, size, fmt, temp, scratch);
+        size -= temp;
+        next += temp;
+
+        temp = dbg_command_buf (scratch, sizeof scratch, label,
+                        readl (&ehci->regs->command));
+        temp = scnprintf (next, size, fmt, temp, scratch);
+        size -= temp;
+        next += temp;
+
+        temp = dbg_intr_buf (scratch, sizeof scratch, label,
+                        readl (&ehci->regs->intr_enable));
+        temp = scnprintf (next, size, fmt, temp, scratch);
+        size -= temp;
+        next += temp;
+
+        temp = scnprintf (next, size, "uframe %04x\n",
+                        readl (&ehci->regs->frame_index));
+        size -= temp;
+        next += temp;
+
+        for (i = 0; i < HCS_N_PORTS (ehci->hcs_params); i++) {
+                temp = dbg_port_buf (scratch, sizeof scratch, label, i + 1,
+                                readl (&ehci->regs->port_status [i]));
+                temp = scnprintf (next, size, fmt, temp, scratch);
+                size -= temp;
+                next += temp;
+        }
+
+        if (ehci->reclaim) {
+                temp = scnprintf (next, size, "reclaim qh %p%s\n",
+                                ehci->reclaim,
+                                ehci->reclaim_ready ? " ready" : "");
+                size -= temp;
+                next += temp;
+        }
+
+#ifdef EHCI_STATS
+        temp = scnprintf (next, size,
+                "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
+                ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
+                ehci->stats.lost_iaa);
+        size -= temp;
+        next += temp;
+
+        temp = scnprintf (next, size, "complete %ld unlink %ld\n",
+                ehci->stats.complete, ehci->stats.unlink);
+        size -= temp;
+        next += temp;
+#endif
+
+done:
+        spin_unlock_irqrestore (&ehci->lock, flags);
+
+        return PAGE_SIZE - size;
+}
+static CLASS_DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL);
+
+static inline void create_debug_files (struct ehci_hcd *ehci)
+{
+        struct class_device *cldev = &ehci_to_hcd(ehci)->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);
+}
+
+static inline void remove_debug_files (struct ehci_hcd *ehci)
+{
+        struct class_device *cldev = &ehci_to_hcd(ehci)->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 /* STUB_DEBUG_FILES */
+