From c88cda562ae142bb51ad49090829d6e8975440dd Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Thu, 1 Nov 2007 19:25:05 +0000
Subject: [PATCH] cleanup USB driver, it's still experimental

SVN-Revision: 9480
---
 .../files/drivers/usb/host/adm5120-dbg.c      | 334 +++++----
 .../files/drivers/usb/host/adm5120-hcd.c      | 188 ++---
 .../files/drivers/usb/host/adm5120-mem.c      |  44 +-
 .../files/drivers/usb/host/adm5120-q.c        | 691 +++++++-----------
 .../adm5120/files/drivers/usb/host/adm5120.h  | 114 ++-
 5 files changed, 604 insertions(+), 767 deletions(-)

diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
index 817d9754874..bb83450eb5d 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
@@ -11,55 +11,108 @@
 
 #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))
+static inline char *ed_typestring(int ed_type)
+{
+	switch (ed_type) {
+	case PIPE_CONTROL:
+		return "ctrl";
+	case PIPE_BULK:
+		return "bulk";
+	case PIPE_INTERRUPT:
+		return "intr";
+	case PIPE_ISOCHRONOUS:
+		return "isoc";
+	}
+	return "(bad ed_type)";
+}
+
+static inline char *ed_statestring(int state)
+{
+	switch (state) {
+	case ED_IDLE:
+		return "IDLE";
+	case ED_UNLINK:
+		return "UNLINK";
+	case ED_OPER:
+		return "OPER";
+	case ED_NEW:
+		return "NEW";
+	}
+	return "?STATE";
+}
+
+static inline char *pipestring(int pipe)
+{
+	return ed_typestring(usb_pipetype(pipe));
+}
+
+static inline char *td_pidstring(u32 info)
+{
+	switch (info & TD_DP) {
+	case TD_DP_SETUP:
+		return "SETUP";
+	case TD_DP_IN:
+		return "IN";
+	case TD_DP_OUT:
+		return "OUT";
+	}
+	return "?PID";
+}
+
+static inline char *td_togglestring(u32 info)
+{
+	switch (info & TD_T) {
+	case TD_T_DATA0:
+		return "DATA0";
+	case TD_T_DATA1:
+		return "DATA1";
+	case TD_T_CARRY:
+		return "CARRY";
+	}
+	return "?TOGGLE";
+}
 
 /* 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)
+urb_print(struct admhcd *ahcd, struct urb * urb, char * str, int small)
 {
-	unsigned int pipe= urb->pipe;
+	unsigned int pipe = urb->pipe;
 
 	if (!urb->dev || !urb->dev->bus) {
-		dbg("%s URB: no dev", str);
+		admhc_dbg(ahcd, "%s URB: no dev", str);
 		return;
 	}
 
 #ifndef	ADMHC_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);
+	admhc_dbg(ahcd, "URB-%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d "
+			"stat=%d\n",
+			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	ADMHC_VERBOSE_DEBUG
 	if (!small) {
 		int i, len;
 
 		if (usb_pipecontrol(pipe)) {
-			printk(KERN_DEBUG __FILE__ ": setup(8):");
+			admhc_dbg(admhc, "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):",
+			admhc_dbg(admhc, "data(%d/%d): ",
 				urb->actual_length,
 				urb->transfer_buffer_length);
 			len = usb_pipeout(pipe)?
@@ -83,12 +136,8 @@ urb_print(struct urb * urb, char * str, int small)
 	} while (0);
 
 
-static void admhc_dump_intr_mask (
-	struct admhcd *ahcd,
-	char *label,
-	u32 mask,
-	char **next,
-	unsigned *size)
+static void admhc_dump_intr_mask(struct admhcd *ahcd, char *label, u32 mask,
+		char **next, unsigned *size)
 {
 	admhc_dbg_sw(ahcd, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s%s\n",
 		label,
@@ -106,12 +155,8 @@ static void admhc_dump_intr_mask (
 		);
 }
 
-static void maybe_print_eds (
-	struct admhcd *ahcd,
-	char *label,
-	u32 value,
-	char **next,
-	unsigned *size)
+static void maybe_print_eds(struct admhcd *ahcd, char *label, u32 value,
+		char **next, unsigned *size)
 {
 	if (value)
 		admhc_dbg_sw(ahcd, next, size, "%s %08x\n", label, value);
@@ -129,7 +174,7 @@ static char *buss2string (int state)
 	case ADMHC_BUSS_SUSPEND:
 		return "suspend";
 	}
-	return "(bad state)";
+	return "?state";
 }
 
 static void
@@ -152,7 +197,7 @@ admhc_dump_status(struct admhcd *ahcd, char **next, unsigned *size)
 	admhc_dbg_sw(ahcd, next, size,
 		"host_control 0x%08x BUSS=%s%s\n",
 		temp,
-		buss2string (temp & ADMHC_HC_BUSS),
+		buss2string(temp & ADMHC_HC_BUSS),
 		(temp & ADMHC_HC_DMAE) ? " DMAE" : ""
 		);
 
@@ -245,59 +290,42 @@ static const char data1[] = "DATA1";
 static void admhc_dump_td(const struct admhcd *ahcd, const char *label,
 		const struct td *td)
 {
-	u32	tmp = hc32_to_cpup(ahcd, &td->hwINFO);
+	u32	tmp;
 
 	admhc_dbg(ahcd, "%s td %p; urb %p index %d; hwNextTD %08x\n",
 		label, td,
 		td->urb, td->index,
 		hc32_to_cpup(ahcd, &td->hwNextTD));
 
-	if ((td->flags & TD_FLAG_ISO) == 0) {
-		const char	*toggle, *pid;
-
-		switch (tmp & TD_T) {
-		case TD_T_DATA0: toggle = data0; break;
-		case TD_T_DATA1: toggle = data1; break;
-		case TD_T_CARRY: toggle = "CARRY"; break;
-		default: toggle = "(bad 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;
-		}
-		admhc_dbg(ahcd,
-			"     status %08x%s CC=%x EC=%d %s %s ISI=%x FN=%x\n",
-			tmp,
-			(tmp & TD_OWN) ? " OWN" : "",
-			TD_CC_GET(tmp),
-			TD_EC_GET(tmp),
-			toggle,
-			pid,
-			TD_ISI_GET(tmp),
-			TD_FN_GET(tmp));
-	} else {
-#if 0		/* TODO: remove */
-		unsigned	i;
-		admhc_dbg(ahcd, "  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);
-		admhc_dbg(ahcd, "  bp0 %08x be %08x\n",
-			hc32_to_cpup (ahcd, &td->hwCBP) & ~0x0fff,
-			hc32_to_cpup (ahcd, &td->hwBE));
-#endif
-	}
+	tmp = hc32_to_cpup(ahcd, &td->hwINFO);
+	admhc_dbg(ahcd, "     status %08x%s CC=%x EC=%d %s %s ISI=%x FN=%x\n",
+		tmp,
+		(tmp & TD_OWN) ? " OWN" : "",
+		TD_CC_GET(tmp),
+		TD_EC_GET(tmp),
+		td_togglestring(tmp),
+		td_pidstring(tmp),
+		TD_ISI_GET(tmp),
+		TD_FN_GET(tmp));
 
 	tmp = hc32_to_cpup(ahcd, &td->hwCBL);
 	admhc_dbg(ahcd, "     dbp %08x; cbl %08x; LEN=%d%s\n",
-		hc32_to_cpup (ahcd, &td->hwDBP),
+		hc32_to_cpup(ahcd, &td->hwDBP),
 		tmp,
 		TD_BL_GET(tmp),
-		(tmp & TD_IE) ? " IE" : ""
-	);
+		(tmp & TD_IE) ? " IE" : "");
+}
+
+static void admhc_dump_up(const struct admhcd *ahcd, const char *label,
+		const struct urb_priv *up)
+{
+	int i;
+
+	admhc_dbg(ahcd, "%s urb/%p:\n", label, up->urb);
+	for (i = 0; i < up->td_cnt; i++) {
+		struct td *td = up->td[i];
+		admhc_dump_td(ahcd, "    ->", td);
+	}
 }
 
 /* caller MUST own hcd spinlock if verbose is set! */
@@ -307,10 +335,10 @@ admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 {
 	u32 tmp = hc32_to_cpu(ahcd, ed->hwINFO);
 
-	admhc_dbg(ahcd, "%s ed %p state 0x%x type %s; next ed %08x\n",
+	admhc_dbg(ahcd, "%s ed %p %s type %s; next ed %08x\n",
 		label,
-		ed, ed->state, edstring (ed->type),
-		hc32_to_cpup (ahcd, &ed->hwNextED));
+		ed, ed_statestring(ed->state), ed_typestring(ed->type),
+		hc32_to_cpup(ahcd, &ed->hwNextED));
 
 	admhc_dbg(ahcd, "  info %08x MAX=%d%s%s%s%s EP=%d DEV=%d\n", tmp,
 		ED_MPS_GET(tmp),
@@ -322,23 +350,22 @@ admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 		ED_FA_GET(tmp));
 
 	tmp = hc32_to_cpup(ahcd, &ed->hwHeadP);
-	admhc_dbg(ahcd, "  tds: head %08x tail %08x %s%s%s\n",
+	admhc_dbg(ahcd, "  tds: head %08x tail %08x %s%s\n",
 		tmp & TD_MASK,
-		hc32_to_cpup (ahcd, &ed->hwTailP),
+		hc32_to_cpup(ahcd, &ed->hwTailP),
 		(tmp & ED_C) ? data1 : data0,
-		(tmp & ED_H) ? " HALT" : "",
-		verbose ? " td list follows" : " (not listing)");
+		(tmp & ED_H) ? " HALT" : "");
 
-	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);
-			admhc_dump_td (ahcd, "  ->", td);
+	if (ed->urb_active)
+		admhc_dump_up(ahcd, "  active ", ed->urb_active);
+
+	if ((verbose) && (!list_empty(&ed->urb_pending))) {
+		struct list_head *entry;
+		/* dump pending URBs */
+		list_for_each(entry, &ed->urb_pending) {
+			struct urb_priv *up;
+			up = list_entry(entry, struct urb_priv, pending);
+			admhc_dump_up(ahcd, "  pending ", up);
 		}
 	}
 }
@@ -346,6 +373,8 @@ admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 #else /* ifdef DEBUG */
 
 static inline void urb_print(struct urb * urb, char * str, int small) {}
+static inline void admhc_dump_up(const struct admhcd *ahcd, const char *label,
+	const struct urb_priv *up) {}
 static inline void admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 	const struct ed *ed, int verbose) {}
 static inline void admhc_dump(struct admhcd *ahcd, int verbose) {}
@@ -363,6 +392,44 @@ static inline void remove_debug_files(struct admhcd *bus) { }
 
 #else
 
+static ssize_t
+show_urb_priv(struct admhcd *ahcd, char *buf, size_t count,
+		struct urb_priv *up)
+{
+	unsigned temp, size = count;
+	int i;
+
+	if (!up)
+		return 0;
+
+	temp = scnprintf(buf, size,"\n\turb %p ", up->urb);
+	size -= temp;
+	buf += temp;
+
+	for (i = 0; i< up->td_cnt; i++) {
+		struct td *td;
+		u32 dbp, cbl, info;
+
+		td = up->td[i];
+		info = hc32_to_cpup(ahcd, &td->hwINFO);
+		dbp = hc32_to_cpup(ahcd, &td->hwDBP);
+		cbl = hc32_to_cpup(ahcd, &td->hwCBL);
+
+		temp = scnprintf(buf, size,
+			"\n\t\ttd %p %s %d %s%scc=%x (%08x,%08x)",
+			td,
+			td_pidstring(info),
+			TD_BL_GET(cbl),
+			(info & TD_OWN) ? "WORK " : "DONE ",
+			(cbl & TD_IE) ? "IE " : "",
+			TD_CC_GET(info), info, cbl);
+		size -= temp;
+		buf += temp;
+	}
+
+	return count - size;
+}
+
 static ssize_t
 show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 {
@@ -371,23 +438,15 @@ show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 	if (!ed)
 		return 0;
 
-#if 0
-	/* print first --> last */
-	while (ed->ed_prev)
-		ed = ed->ed_prev;
-#endif
-
 	/* dump a snapshot of the bulk or control schedule */
 	while (ed) {
 		u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
 		u32 headp = hc32_to_cpu(ahcd, ed->hwHeadP);
-		struct list_head *entry;
-		struct td	*td;
 
 		temp = scnprintf(buf, size,
 			"ed/%p %s %cs dev%d ep%d %s%smax %d %08x%s%s %s",
 			ed,
-			edstring (ed->type),
+			ed_typestring (ed->type),
 			(info & ED_SPEED_FULL) ? 'f' : 'l',
 			info & ED_FA_MASK,
 			(info >> ED_EN_SHIFT) & ED_EN_MASK,
@@ -397,34 +456,36 @@ show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 			info,
 			(info & ED_SKIP) ? " S" : "",
 			(headp & ED_H) ? " H" : "",
-			(headp & ED_C) ? data1 : data0);
+			(headp & ED_C) ? "DATA1" : "DATA0");
 		size -= temp;
 		buf += temp;
 
-		list_for_each(entry, &ed->td_list) {
-			u32		dbp, cbl;
-
-			td = list_entry(entry, struct td, td_list);
-			info = hc32_to_cpup (ahcd, &td->hwINFO);
-			dbp = hc32_to_cpup (ahcd, &td->hwDBP);
-			cbl = hc32_to_cpup (ahcd, &td->hwCBL);
-
-			temp = scnprintf(buf, size,
-				"\n\ttd %p %s %d %s%scc=%x urb %p (%08x,%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 = "(bad pid)"; break;
-				 } pid;}),
-				TD_BL_GET(cbl),
-				(info & TD_OWN) ? "" : "DONE ",
-				(cbl & TD_IE) ? "IE " : "",
-				TD_CC_GET (info), td->urb, info, cbl);
+		if (ed->urb_active) {
+			temp = scnprintf(buf, size, "\nactive urb:");
 			size -= temp;
 			buf += temp;
+
+			temp = show_urb_priv(ahcd, buf, size, ed->urb_active);
+			size -= temp;
+			buf += temp;
+		}
+
+		if (!list_empty(&ed->urb_pending)) {
+			struct list_head *entry;
+
+			temp = scnprintf(buf, size, "\npending urbs:");
+			size -= temp;
+			buf += temp;
+
+			list_for_each(entry, &ed->urb_pending) {
+				struct urb_priv *up;
+				up = list_entry(entry, struct urb_priv,
+					pending);
+
+				temp = show_urb_priv(ahcd, buf, size, up);
+				size -= temp;
+				buf += temp;
+			}
 		}
 
 		temp = scnprintf(buf, size, "\n");
@@ -433,6 +494,7 @@ show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 
 		ed = ed->ed_next;
 	}
+
 	return count - size;
 }
 
@@ -451,17 +513,7 @@ show_async(struct class_device *class_dev, char *buf)
 
 	/* display control and bulk lists together, for simplicity */
 	spin_lock_irqsave(&ahcd->lock, flags);
-#if 0
-	temp = show_list (ahcd, buf, PAGE_SIZE, ahcd->ed_tails[ED_TAIL_CONTROL]);
-	temp += show_list (ahcd, buf + temp, PAGE_SIZE - temp,
-		ahcd->ed_tails[ED_TAIL_BULK]);
-#else
-#ifdef ED_TAIL_ARRAY
-	temp = show_list(ahcd, buf, PAGE_SIZE, ahcd->ed_head);
-#else
 	temp = show_list(ahcd, buf, PAGE_SIZE, ahcd->ed_head);
-#endif
-#endif
 	spin_unlock_irqrestore(&ahcd->lock, flags);
 
 	return temp;
@@ -474,6 +526,7 @@ static CLASS_DEVICE_ATTR(async, S_IRUGO, show_async, NULL);
 static ssize_t
 show_periodic(struct class_device *class_dev, char *buf)
 {
+#if 0
 	struct usb_bus		*bus;
 	struct usb_hcd		*hcd;
 	struct admhcd		*ahcd;
@@ -564,6 +617,9 @@ show_periodic(struct class_device *class_dev, char *buf)
 	kfree (seen);
 
 	return PAGE_SIZE - size;
+#else
+	return 0;
+#endif
 }
 static CLASS_DEVICE_ATTR(periodic, S_IRUGO, show_periodic, NULL);
 
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c
index 3365a1d0a2d..fae5aa64fa3 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c
@@ -45,7 +45,7 @@
 #include "../core/hcd.h"
 #include "../core/hub.h"
 
-#define DRIVER_VERSION	"v0.01"
+#define DRIVER_VERSION	"v0.02"
 #define DRIVER_AUTHOR	"Gabor Juhos <juhosg at openwrt.org>"
 #define DRIVER_DESC	"ADMtek USB 1.1 Host Controller Driver"
 
@@ -90,12 +90,14 @@ static int admhc_urb_enqueue(struct usb_hcd *hcd, struct usb_host_endpoint *ep,
 	struct ed	*ed;
 	struct urb_priv	*urb_priv;
 	unsigned int	pipe = urb->pipe;
-	int		i, td_cnt = 0;
+	int		td_cnt = 0;
 	unsigned long	flags;
 	int		retval = 0;
 
 #ifdef ADMHC_VERBOSE_DEBUG
-	urb_print(urb, "ENQ", usb_pipein(pipe));
+	spin_lock_irqsave(&ahcd->lock, flags);
+	urb_print(ahcd, urb, "ENQEUE", usb_pipein(pipe));
+	spin_unlock_irqrestore(&ahcd->lock, flags);
 #endif
 
 	/* every endpoint has an ed, locate and maybe (re)initialize it */
@@ -112,10 +114,12 @@ static int admhc_urb_enqueue(struct usb_hcd *hcd, struct usb_host_endpoint *ep,
 
 		/* 1 TD for setup, 1 for ACK, plus ... */
 		td_cnt = 2;
-		/* FALLTHROUGH */
+		if (urb->transfer_buffer_length)
+			td_cnt++;
+		break;
 	case PIPE_BULK:
 		/* one TD for every 4096 Bytes (can be upto 8K) */
-		td_cnt += urb->transfer_buffer_length / TD_DATALEN_MAX;
+		td_cnt = urb->transfer_buffer_length / TD_DATALEN_MAX;
 		/* ... and for any remaining bytes ... */
 		if ((urb->transfer_buffer_length % TD_DATALEN_MAX) != 0)
 			td_cnt++;
@@ -151,6 +155,7 @@ static int admhc_urb_enqueue(struct usb_hcd *hcd, struct usb_host_endpoint *ep,
 		return -ENOMEM;
 
 	urb_priv->ed = ed;
+	urb_priv->urb = urb;
 
 	spin_lock_irqsave(&ahcd->lock, flags);
 	/* don't submit to a dead HC */
@@ -173,14 +178,8 @@ static int admhc_urb_enqueue(struct usb_hcd *hcd, struct usb_host_endpoint *ep,
 		goto fail;
 	}
 
-	/* schedule the ed if needed */
-	if (ed->state == ED_IDLE) {
-#ifndef LATE_ED_SCHEDULE
-		retval = ed_schedule(ahcd, ed);
-		if (retval < 0)
-			goto fail0;
-#endif
-		if (ed->type == PIPE_ISOCHRONOUS) {
+	if (ed->type == PIPE_ISOCHRONOUS) {
+		if (ed->state == ED_NEW) {
 			u16	frame = admhc_frame_no(ahcd);
 
 			/* delay a few frames before the first TD */
@@ -192,29 +191,26 @@ static int admhc_urb_enqueue(struct usb_hcd *hcd, struct usb_host_endpoint *ep,
 			/* yes, only URB_ISO_ASAP is supported, and
 			 * urb->start_frame is never used as input.
 			 */
-		}
-	} else if (ed->type == PIPE_ISOCHRONOUS)
-		urb->start_frame = ed->last_iso + ed->interval;
+		} else
+			urb->start_frame = ed->last_iso + ed->interval;
+	}
 
-	/* fill the TDs and link them to the ed; and
-	 * enable that part of the schedule, if needed
-	 * and update count of queued periodic urbs
-	 */
 	urb->hcpriv = urb_priv;
-	td_submit_urb(ahcd, urb);
+	td_submit_urb(ahcd, urb_priv->urb);
 
-#ifdef LATE_ED_SCHEDULE
-	if (ed->state == ED_IDLE)
-		retval = ed_schedule(ahcd, ed);
-#endif
+	/* append it to the ED's queue */
+	list_add_tail(&urb_priv->pending, &ed->urb_pending);
 
-	admhc_dump_ed(ahcd, "admhc_urb_enqueue", urb_priv->ed, 1);
+	/* schedule the ED */
+	retval = ed_schedule(ahcd, ed);
 
 fail0:
 	spin_unlock(&urb->lock);
 fail:
-	if (retval)
+	if (retval) {
+		urb_priv = urb->hcpriv;
 		urb_priv_free(ahcd, urb_priv);
+	}
 
 	spin_unlock_irqrestore(&ahcd->lock, flags);
 	return retval;
@@ -228,33 +224,44 @@ fail:
  */
 static int admhc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
 {
-	struct admhcd		*ahcd = hcd_to_admhcd(hcd);
-	unsigned long		flags;
+	struct admhcd *ahcd = hcd_to_admhcd(hcd);
+	struct urb_priv *up;
+	unsigned long flags;
+
+	up = urb->hcpriv;
+	if (!up)
+		return 0;
+
+	spin_lock_irqsave(&ahcd->lock, flags);
 
 #ifdef ADMHC_VERBOSE_DEBUG
-	urb_print(urb, "DEQ", 1);
+	urb_print(ahcd, urb, "DEQEUE", 1);
 #endif
 
-	spin_lock_irqsave(&ahcd->lock, flags);
 	if (HC_IS_RUNNING(hcd->state)) {
-		struct urb_priv *urb_priv;
-
 		/* Unless an IRQ completed the unlink while it was being
 		 * handed to us, flag it for unlink and giveback, and force
 		 * some upcoming INTR_SF to call finish_unlinks()
 		 */
-		urb_priv = urb->hcpriv;
-		if (urb_priv) {
-			if (urb_priv->ed->state == ED_OPER)
-				start_ed_unlink(ahcd, urb_priv->ed);
+		if (up->ed->urb_active != up) {
+			list_del(&up->pending);
+			finish_urb(ahcd, urb);
+		} else {
+			ed_start_deschedule(ahcd, up->ed);
 		}
 	} else {
 		/*
 		 * with HC dead, we won't respect hc queue pointers
 		 * any more ... just clean up every urb's memory.
 		 */
-		if (urb->hcpriv)
+		if (up->ed->urb_active != up) {
+			list_del(&up->pending);
 			finish_urb(ahcd, urb);
+		} else {
+			finish_urb(ahcd, urb);
+			up->ed->urb_active = NULL;
+			up->ed->state = ED_IDLE;
+		}
 	}
 	spin_unlock_irqrestore(&ahcd->lock, flags);
 
@@ -266,9 +273,8 @@ static int admhc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
 /* frees config/altsetting state for endpoints,
  * including ED memory, dummy TD, and bulk/intr data toggle
  */
-
-static void
-admhc_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
+static void admhc_endpoint_disable(struct usb_hcd *hcd,
+		struct usb_host_endpoint *ep)
 {
 	struct admhcd		*ahcd = hcd_to_admhcd(hcd);
 	unsigned long		flags;
@@ -283,7 +289,7 @@ admhc_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 
 #ifdef ADMHC_VERBOSE_DEBUG
 	spin_lock_irqsave(&ahcd->lock, flags);
-	admhc_dump_ed(ahcd, "ep_disable", ed, 1);
+	admhc_dump_ed(ahcd, "EP-DISABLE", ed, 1);
 	spin_unlock_irqrestore(&ahcd->lock, flags);
 #endif
 
@@ -292,8 +298,8 @@ rescan:
 
 	if (!HC_IS_RUNNING(hcd->state)) {
 sanitize:
-		ed->state = ED_IDLE;
-		finish_unlinks(ahcd, 0);
+		ed->state = ED_UNLINK;
+		admhc_finish_unlinks(ahcd, 0);
 	}
 
 	switch (ed->state) {
@@ -306,10 +312,11 @@ sanitize:
 		spin_unlock_irqrestore(&ahcd->lock, flags);
 		schedule_timeout_uninterruptible(1);
 		goto rescan;
-	case ED_IDLE:		/* fully unlinked */
-		if (list_empty(&ed->td_list)) {
-			td_free (ahcd, ed->dummy);
-			ed_free (ahcd, ed);
+	case ED_IDLE:
+	case ED_NEW:		/* fully unlinked */
+		if (list_empty(&ed->urb_pending)) {
+			td_free(ahcd, ed->dummy);
+			ed_free(ahcd, ed);
 			break;
 		}
 		/* else FALL THROUGH */
@@ -317,13 +324,16 @@ sanitize:
 		/* caller was supposed to have unlinked any requests;
 		 * that's not our job.  can't recover; must leak ed.
 		 */
-		admhc_err(ahcd, "leak ed %p (#%02x) state %d%s\n",
-			ed, ep->desc.bEndpointAddress, ed->state,
-			list_empty(&ed->td_list) ? "" : " (has tds)");
-		td_free(ahcd, ed->dummy);
+		admhc_err(ahcd, "leak ed %p (#%02x) %s act %p%s\n",
+			ed, ep->desc.bEndpointAddress,
+			ed_statestring(ed->state),
+			ed->urb_active,
+			list_empty(&ed->urb_pending) ? "" : " (has urbs)");
 		break;
 	}
+
 	ep->hcpriv = NULL;
+
 	spin_unlock_irqrestore(&ahcd->lock, flags);
 	return;
 }
@@ -337,15 +347,8 @@ static int admhc_get_frame(struct usb_hcd *hcd)
 
 static void admhc_usb_reset(struct admhcd *ahcd)
 {
-#if 0
-	ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
-	ahcd->hc_control &= OHCI_CTRL_RWC;
-	admhc_writel(ahcd, ahcd->hc_control, &ahcd->regs->control);
-#else
-	/* FIXME */
 	ahcd->host_control = ADMHC_BUSS_RESET;
 	admhc_writel(ahcd, ahcd->host_control ,&ahcd->regs->host_control);
-#endif
 }
 
 /* admhc_shutdown forcibly disables IRQs and DMA, helping kexec and
@@ -510,17 +513,6 @@ static int admhc_run(struct admhcd *ahcd)
 		/* also: power/overcurrent flags in rhdesc */
 	}
 
-#if 0	/* TODO: not applicable */
-	/* Reset USB nearly "by the book".  RemoteWakeupConnected was
-	 * saved if boot firmware (BIOS/SMM/...) told us it's connected,
-	 * or if bus glue did the same (e.g. for PCI add-in cards with
-	 * PCI PM support).
-	 */
-	if ((ahcd->hc_control & OHCI_CTRL_RWC) != 0
-			&& !device_may_wakeup(hcd->self.controller))
-		device_init_wakeup(hcd->self.controller, 1);
-#endif
-
 	switch (ahcd->host_control & ADMHC_HC_BUSS) {
 	case ADMHC_BUSS_OPER:
 		temp = 0;
@@ -658,6 +650,7 @@ static irqreturn_t admhc_irq(struct usb_hcd *hcd)
 
 	ints &= admhc_readl(ahcd, &regs->int_enable);
 
+	spin_lock(&ahcd->lock);
 	if (ints & ADMHC_INTR_FATI) {
 		/* e.g. due to PCI Master/Target Abort */
 		admhc_disable(ahcd);
@@ -666,6 +659,13 @@ static irqreturn_t admhc_irq(struct usb_hcd *hcd)
 		admhc_usb_reset(ahcd);
 	}
 
+	if (ints & ADMHC_INTR_BABI) {
+		admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
+		admhc_err(ahcd, "Babble Detected\n");
+		admhc_disable(ahcd);
+		admhc_usb_reset(ahcd);
+	}
+
 	if (ints & ADMHC_INTR_INSM) {
 		admhc_vdbg(ahcd, "Root Hub Status Change\n");
 		ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
@@ -690,21 +690,17 @@ static irqreturn_t admhc_irq(struct usb_hcd *hcd)
 		admhc_intr_ack(ahcd, ADMHC_INTR_RESI);
 		hcd->poll_rh = 1;
 		if (ahcd->autostop) {
-			spin_lock(&ahcd->lock);
 			admhc_rh_resume(ahcd);
-			spin_unlock(&ahcd->lock);
 		} else
 			usb_hcd_resume_root_hub(hcd);
 	}
 
 	if (ints & ADMHC_INTR_TDC) {
-		admhc_vdbg(ahcd, "Transfer Descriptor Complete\n");
 		admhc_intr_ack(ahcd, ADMHC_INTR_TDC);
 		if (HC_IS_RUNNING(hcd->state))
 			admhc_intr_disable(ahcd, ADMHC_INTR_TDC);
-		spin_lock(&ahcd->lock);
+		admhc_vdbg(ahcd, "Transfer Descriptor Complete\n");
 		admhc_td_complete(ahcd);
-		spin_unlock(&ahcd->lock);
 		if (HC_IS_RUNNING(hcd->state))
 			admhc_intr_enable(ahcd, ADMHC_INTR_TDC);
 	}
@@ -714,49 +710,19 @@ static irqreturn_t admhc_irq(struct usb_hcd *hcd)
 		admhc_vdbg(ahcd, "Schedule Overrun\n");
 	}
 
-	if (ints & ADMHC_INTR_BABI) {
-		admhc_intr_disable(ahcd, ADMHC_INTR_BABI);
-		admhc_intr_ack(ahcd, ADMHC_INTR_BABI);
-		admhc_err(ahcd, "Babble Detected\n");
-	}
-
-#if 1
-	spin_lock(&ahcd->lock);
-	if (ahcd->ed_rm_list)
-		finish_unlinks(ahcd, admhc_frame_no(ahcd));
-
-	if ((ints & ADMHC_INTR_SOFI) != 0 && !ahcd->ed_rm_list
-			&& HC_IS_RUNNING(hcd->state))
-		admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
-	spin_unlock(&ahcd->lock);
-#else
 	if (ints & ADMHC_INTR_SOFI) {
-		admhc_vdbg(ahcd, "Start Of Frame\n");
-		spin_lock(&ahcd->lock);
-
+		admhc_intr_ack(ahcd, ADMHC_INTR_SOFI);
 		/* handle any pending ED removes */
-		finish_unlinks(ahcd, admhc_frameno(ahcd));
-
-		/* leaving INTR_SOFI enabled when there's still unlinking
-		 * to be done in the (next frame).
-		 */
-		if ((ahcd->ed_rm_list == NULL) ||
-			HC_IS_RUNNING(hcd->state) == 0)
-			/*
-			 * disable INTR_SOFI if there are no unlinking to be
-			 * done (in the next frame)
-			 */
-			admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
-
-		spin_unlock(&ahcd->lock);
+		admhc_finish_unlinks(ahcd, admhc_frame_no(ahcd));
+		admhc_sof_refill(ahcd);
 	}
-#endif
 
 	if (HC_IS_RUNNING(hcd->state)) {
 		admhc_intr_ack(ahcd, ints);
 		admhc_intr_enable(ahcd, ADMHC_INTR_MIE);
 		admhc_writel_flush(ahcd);
 	}
+	spin_unlock(&ahcd->lock);
 
 	return IRQ_HANDLED;
 }
@@ -804,7 +770,7 @@ static int admhc_restart(struct admhcd *ahcd)
 	usb_root_hub_lost_power(admhcd_to_hcd(ahcd)->self.root_hub);
 	if (!list_empty(&ahcd->pending))
 		admhc_dbg(ahcd, "abort schedule...\n");
-		list_for_each_entry (priv, &ahcd->pending, pending) {
+		list_for_each_entry(priv, &ahcd->pending, pending) {
 		struct urb	*urb = priv->td[0]->urb;
 		struct ed	*ed = priv->ed;
 
@@ -829,7 +795,7 @@ static int admhc_restart(struct admhcd *ahcd)
 		urb->status = -ESHUTDOWN;
 		spin_unlock(&urb->lock);
 	}
-	finish_unlinks (ahcd, 0);
+	finish_unlinks(ahcd, 0);
 	spin_unlock_irq(&ahcd->lock);
 
 	/* paranoia, in case that didn't work: */
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c
index 924221be15d..3e9c2f0b92a 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c
@@ -27,7 +27,7 @@ static void admhc_hcd_init(struct admhcd *ahcd)
 {
 	ahcd->next_statechange = jiffies;
 	spin_lock_init(&ahcd->lock);
-	INIT_LIST_HEAD(&ahcd->pending);
+	spin_lock_init(&ahcd->dma_lock);
 }
 
 /*-------------------------------------------------------------------------*/
@@ -76,19 +76,6 @@ static void admhc_mem_cleanup(struct admhcd *ahcd)
 
 /*-------------------------------------------------------------------------*/
 
-/* ahcd "done list" processing needs this mapping */
-static inline struct td *dma_to_td(struct admhcd *ahcd, dma_addr_t td_dma)
-{
-	struct td *td;
-
-	td_dma &= TD_MASK;
-	td = ahcd->td_hash[TD_HASH_FUNC(td_dma)];
-	while (td && td->td_dma != td_dma)
-		td = td->td_hash;
-
-	return td;
-}
-
 /* TDs ... */
 static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
 {
@@ -101,29 +88,13 @@ static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
 
 	/* in case ahcd fetches it, make it look dead */
 	memset(td, 0, sizeof *td);
-	td->hwNextTD = cpu_to_hc32(ahcd, dma);
 	td->td_dma = dma;
-	/* hashed in td_fill */
 
 	return td;
 }
 
 static void td_free(struct admhcd *ahcd, struct td *td)
 {
-	struct td **prev = &ahcd->td_hash[TD_HASH_FUNC(td->td_dma)];
-
-	while (*prev && *prev != td)
-		prev = &(*prev)->td_hash;
-	if (*prev)
-		*prev = td->td_hash;
-#if 0
-	/* TODO: remove */
-	else if ((td->hwINFO & cpu_to_hc32(ahcd, TD_DONE)) != 0)
-		admhc_dbg (ahcd, "no hash for td %p\n", td);
-#else
-	else if ((td->flags & TD_FLAG_DONE) != 0)
-		admhc_dbg (ahcd, "no hash for td %p\n", td);
-#endif
 	dma_pool_free(ahcd->td_cache, td, td->td_dma);
 }
 
@@ -142,8 +113,7 @@ static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
 	memset(ed, 0, sizeof(*ed));
 	ed->dma = dma;
 
-	INIT_LIST_HEAD(&ed->td_list);
-	INIT_LIST_HEAD(&ed->urb_list);
+	INIT_LIST_HEAD(&ed->urb_pending);
 
 	return ed;
 }
@@ -164,7 +134,6 @@ static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
 		if (urb_priv->td[i])
 			td_free(ahcd, urb_priv->td[i]);
 
-	list_del(&urb_priv->pending);
 	kfree(urb_priv);
 }
 
@@ -172,6 +141,7 @@ static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
 		gfp_t mem_flags)
 {
 	struct urb_priv	*priv;
+	int i;
 
 	/* allocate the private part of the URB */
 	priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
@@ -179,13 +149,15 @@ static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
 		goto err;
 
 	/* allocate the TDs (deferring hash chain updates) */
-	for (priv->td_cnt = 0; priv->td_cnt < num_tds; priv->td_cnt++) {
-		priv->td[priv->td_cnt] = td_alloc(ahcd, mem_flags);
-		if (priv->td[priv->td_cnt] == NULL)
+	for (i = 0; i < num_tds; i++) {
+		priv->td[i] = td_alloc(ahcd, mem_flags);
+		if (priv->td[i] == NULL)
 			goto err_free;
+		priv->td[i]->index = i;
 	}
 
 	INIT_LIST_HEAD(&priv->pending);
+	priv->td_cnt = num_tds;
 
 	return priv;
 
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-q.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-q.c
index 24542d27339..2eafecc4fa3 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-q.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-q.c
@@ -38,7 +38,7 @@ __acquires(ahcd->lock)
 			&& urb->status == 0) {
 		urb->status = -EREMOTEIO;
 #ifdef ADMHC_VERBOSE_DEBUG
-		urb_print(urb, "SHORT", usb_pipeout (urb->pipe));
+		urb_print(ahcd, urb, "SHORT", usb_pipeout (urb->pipe));
 #endif
 	}
 	spin_unlock(&urb->lock);
@@ -53,7 +53,7 @@ __acquires(ahcd->lock)
 	}
 
 #ifdef ADMHC_VERBOSE_DEBUG
-	urb_print(urb, "RET", usb_pipeout (urb->pipe));
+	urb_print(ahcd, urb, "FINISH", 0);
 #endif
 
 	/* urb->complete() can reenter this HCD */
@@ -67,189 +67,6 @@ __acquires(ahcd->lock)
  * ED handling functions
  *-------------------------------------------------------------------------*/
 
-#if 0	/* FIXME */
-/* search for the right schedule branch to use for a periodic ed.
- * does some load balancing; returns the branch, or negative errno.
- */
-static int balance(struct admhcd *ahcd, int interval, int load)
-{
-	int	i, branch = -ENOSPC;
-
-	/* iso periods can be huge; iso tds specify frame numbers */
-	if (interval > NUM_INTS)
-		interval = NUM_INTS;
-
-	/* search for the least loaded schedule branch of that period
-	 * that has enough bandwidth left unreserved.
-	 */
-	for (i = 0; i < interval ; i++) {
-		if (branch < 0 || ahcd->load [branch] > ahcd->load [i]) {
-			int	j;
-
-			/* usb 1.1 says 90% of one frame */
-			for (j = i; j < NUM_INTS; j += interval) {
-				if ((ahcd->load [j] + load) > 900)
-					break;
-			}
-			if (j < NUM_INTS)
-				continue;
-			branch = i;
-		}
-	}
-	return branch;
-}
-#endif
-
-/*-------------------------------------------------------------------------*/
-
-#if 0	/* FIXME */
-/* both iso and interrupt requests have periods; this routine puts them
- * into the schedule tree in the apppropriate place.  most iso devices use
- * 1msec periods, but that's not required.
- */
-static void periodic_link (struct admhcd *ahcd, struct ed *ed)
-{
-	unsigned	i;
-
-	admhc_vdbg (ahcd, "link %sed %p branch %d [%dus.], interval %d\n",
-		(ed->hwINFO & cpu_to_hc32 (ahcd, ED_ISO)) ? "iso " : "",
-		ed, ed->branch, ed->load, ed->interval);
-
-	for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
-		struct ed	**prev = &ahcd->periodic [i];
-		__hc32		*prev_p = &ahcd->hcca->int_table [i];
-		struct ed	*here = *prev;
-
-		/* sorting each branch by period (slow before fast)
-		 * lets us share the faster parts of the tree.
-		 * (plus maybe: put interrupt eds before iso)
-		 */
-		while (here && ed != here) {
-			if (ed->interval > here->interval)
-				break;
-			prev = &here->ed_next;
-			prev_p = &here->hwNextED;
-			here = *prev;
-		}
-		if (ed != here) {
-			ed->ed_next = here;
-			if (here)
-				ed->hwNextED = *prev_p;
-			wmb ();
-			*prev = ed;
-			*prev_p = cpu_to_hc32(ahcd, ed->dma);
-			wmb();
-		}
-		ahcd->load [i] += ed->load;
-	}
-	admhcd_to_hcd(ahcd)->self.bandwidth_allocated += ed->load / ed->interval;
-}
-#endif
-
-/* link an ed into the HC chain */
-
-static int ed_schedule(struct admhcd *ahcd, struct ed *ed)
-{
-	struct ed *old_tail;
-
-	if (admhcd_to_hcd(ahcd)->state == HC_STATE_QUIESCING)
-		return -EAGAIN;
-
-	ed->state = ED_OPER;
-
-	old_tail = ahcd->ed_tails[ed->type];
-
-	ed->ed_next = old_tail->ed_next;
-	if (ed->ed_next) {
-		ed->ed_next->ed_prev = ed;
-		ed->hwNextED = cpu_to_hc32(ahcd, ed->ed_next->dma);
-	}
-	ed->ed_prev = old_tail;
-
-	old_tail->ed_next = ed;
-	old_tail->hwNextED = cpu_to_hc32(ahcd, ed->dma);
-
-	ahcd->ed_tails[ed->type] = ed;
-
-	admhc_dma_enable(ahcd);
-
-	return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-#if 0	/* FIXME */
-/* scan the periodic table to find and unlink this ED */
-static void periodic_unlink (struct admhcd *ahcd, struct ed *ed)
-{
-	int	i;
-
-	for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
-		struct ed	*temp;
-		struct ed	**prev = &ahcd->periodic [i];
-		__hc32		*prev_p = &ahcd->hcca->int_table [i];
-
-		while (*prev && (temp = *prev) != ed) {
-			prev_p = &temp->hwNextED;
-			prev = &temp->ed_next;
-		}
-		if (*prev) {
-			*prev_p = ed->hwNextED;
-			*prev = ed->ed_next;
-		}
-		ahcd->load [i] -= ed->load;
-	}
-
-	admhcd_to_hcd(ahcd)->self.bandwidth_allocated -= ed->load / ed->interval;
-	admhc_vdbg (ahcd, "unlink %sed %p branch %d [%dus.], interval %d\n",
-		(ed->hwINFO & cpu_to_hc32 (ahcd, ED_ISO)) ? "iso " : "",
-		ed, ed->branch, ed->load, ed->interval);
-}
-#endif
-
-/* unlink an ed from the HC chain.
- * just the link to the ed is unlinked.
- * the link from the ed still points to another operational ed or 0
- * so the HC can eventually finish the processing of the unlinked ed
- * (assuming it already started that, which needn't be true).
- *
- * ED_UNLINK is a transient state: the HC may still see this ED, but soon
- * it won't.  ED_SKIP means the HC will finish its current transaction,
- * but won't start anything new.  The TD queue may still grow; device
- * drivers don't know about this HCD-internal state.
- *
- * When the HC can't see the ED, something changes ED_UNLINK to one of:
- *
- *  - ED_OPER: when there's any request queued, the ED gets rescheduled
- *    immediately.  HC should be working on them.
- *
- *  - ED_IDLE:  when there's no TD queue. there's no reason for the HC
- *    to care about this ED; safe to disable the endpoint.
- *
- * When finish_unlinks() runs later, after SOF interrupt, it will often
- * complete one or more URB unlinks before making that state change.
- */
-static void ed_deschedule(struct admhcd *ahcd, struct ed *ed)
-{
-	ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
-	wmb();
-	ed->state = ED_UNLINK;
-
-	/* remove this ED from the HC list */
-	ed->ed_prev->hwNextED = ed->hwNextED;
-
-	/* and remove it from our list also */
-	ed->ed_prev->ed_next = ed->ed_next;
-
-	if (ed->ed_next)
-		ed->ed_next->ed_prev = ed->ed_prev;
-
-	if (ahcd->ed_tails[ed->type] == ed)
-		ahcd->ed_tails[ed->type] = ed->ed_prev;
-}
-
-/*-------------------------------------------------------------------------*/
-
 static struct ed *ed_create(struct admhcd *ahcd, unsigned int type, u32 info)
 {
 	struct ed *ed;
@@ -274,12 +91,12 @@ static struct ed *ed_create(struct admhcd *ahcd, unsigned int type, u32 info)
 	}
 
 	ed->dummy = td;
-	ed->state = ED_IDLE;
+	ed->state = ED_NEW;
 	ed->type = type;
 
 	ed->hwINFO = cpu_to_hc32(ahcd, info);
 	ed->hwTailP = cpu_to_hc32(ahcd, td->td_dma);
-	ed->hwHeadP = ed->hwTailP;	/* ED_C, ED_H zeroed */
+	ed->hwHeadP = cpu_to_hc32(ahcd, td->td_dma);
 
 	return ed;
 
@@ -321,76 +138,118 @@ static struct ed *ed_get(struct admhcd *ahcd,	struct usb_host_endpoint *ep,
 	return ed;
 }
 
-/*-------------------------------------------------------------------------*/
+/* link an ed into the HC chain */
+static int ed_schedule(struct admhcd *ahcd, struct ed *ed)
+{
+	struct ed *old_tail;
 
-/* request unlinking of an endpoint from an operational HC.
- * put the ep on the rm_list
- * real work is done at the next start frame (SOFI) hardware interrupt
- * caller guarantees HCD is running, so hardware access is safe,
- * and that ed->state is ED_OPER
- */
-static void start_ed_unlink(struct admhcd *ahcd, struct ed *ed)
+	if (admhcd_to_hcd(ahcd)->state == HC_STATE_QUIESCING)
+		return -EAGAIN;
+
+	if (ed->state != ED_NEW)
+		return 0;
+
+	admhc_dump_ed(ahcd, "ED-SCHED", ed, 0);
+
+	ed->state = ED_IDLE;
+
+	admhc_dma_lock(ahcd);
+	ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
+
+	old_tail = ahcd->ed_tails[ed->type];
+
+	ed->ed_next = old_tail->ed_next;
+	if (ed->ed_next) {
+		ed->ed_next->ed_prev = ed;
+		ed->hwNextED = cpu_to_hc32(ahcd, ed->ed_next->dma);
+	}
+	ed->ed_prev = old_tail;
+
+	old_tail->ed_next = ed;
+	old_tail->hwNextED = cpu_to_hc32(ahcd, ed->dma);
+
+	ahcd->ed_tails[ed->type] = ed;
+	admhc_dma_unlock(ahcd);
+
+	admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
+
+	return 0;
+}
+
+static void ed_deschedule(struct admhcd *ahcd, struct ed *ed)
 {
-	ed->hwINFO |= cpu_to_hc32 (ahcd, ED_DEQUEUE);
-	ed_deschedule(ahcd, ed);
+	admhc_dump_ed(ahcd, "ED-DESCHED", ed, 0);
+
+	/* remove this ED from the HC list */
+	admhc_dma_lock(ahcd);
+	ed->ed_prev->hwNextED = ed->hwNextED;
+	admhc_dma_unlock(ahcd);
+
+	/* and remove it from our list */
+	ed->ed_prev->ed_next = ed->ed_next;
+
+	if (ed->ed_next) {
+		ed->ed_next->ed_prev = ed->ed_prev;
+		ed->ed_next = NULL;
+	}
+
+	if (ahcd->ed_tails[ed->type] == ed)
+		ahcd->ed_tails[ed->type] = ed->ed_prev;
+
+	ed->state = ED_NEW;
+}
+
+static void ed_start_deschedule(struct admhcd *ahcd, struct ed *ed)
+{
+	admhc_dump_ed(ahcd, "ED-UNLINK", ed, 0);
+
+	admhc_dma_lock(ahcd);
+	ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
+	admhc_dma_unlock(ahcd);
+
+	ed->state = ED_UNLINK;
 
 	/* add this ED into the remove list */
 	ed->ed_rm_next = ahcd->ed_rm_list;
 	ahcd->ed_rm_list = ed;
 
-	/* enable SOF interrupt */
-	admhc_intr_ack(ahcd, ADMHC_INTR_SOFI);
-	admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
-	/* flush those writes */
-	admhc_writel_flush(ahcd);
-
 	/* SOF interrupt might get delayed; record the frame counter value that
 	 * indicates when the HC isn't looking at it, so concurrent unlinks
 	 * behave.  frame_no wraps every 2^16 msec, and changes right before
 	 * SOF is triggered.
 	 */
 	ed->tick = admhc_frame_no(ahcd) + 1;
+
+	/* enable SOF interrupt */
+	admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
 }
 
 /*-------------------------------------------------------------------------*
  * TD handling functions
  *-------------------------------------------------------------------------*/
 
-/* enqueue next TD for this URB (OHCI spec 5.2.8.2) */
-
-static void
-td_fill(struct admhcd *ahcd, u32 info, dma_addr_t data, int len,
-	struct urb *urb, int index)
+static void td_fill(struct admhcd *ahcd, u32 info, dma_addr_t data, int len,
+		struct urb_priv *up)
 {
-	struct td		*td, *td_pt;
-	struct urb_priv		*urb_priv = urb->hcpriv;
-	int			hash;
-	u32			cbl = 0;
-
-#if 1
-	if (index == (urb_priv->td_cnt - 1) &&
-			((urb->transfer_flags & URB_NO_INTERRUPT) == 0))
-		cbl |= TD_IE;
-#else
-	if (index == (urb_priv->td_cnt - 1))
-		cbl |= TD_IE;
-#endif
-
-	/* use this td as the next dummy */
-	td_pt = urb_priv->td[index];
+	struct td *td;
+	u32 cbl = 0;
 
-	/* fill the old dummy TD */
-	td = urb_priv->td[index] = urb_priv->ed->dummy;
-	urb_priv->ed->dummy = td_pt;
+	if (up->td_idx >= up->td_cnt) {
+		admhc_dbg(ahcd, "td_fill error, idx=%d, cnt=%d\n", up->td_idx,
+				up->td_cnt);
+		return;
+	}
 
-	td->ed = urb_priv->ed;
-	td->next_dl_td = NULL;
-	td->index = index;
-	td->urb = urb;
+	td = up->td[up->td_idx];
 	td->data_dma = data;
 	if (!len)
 		data = 0;
 
+#if 1
+	if (up->td_idx == up->td_cnt-1)
+#endif
+		cbl |= TD_IE;
+
 	if (data)
 		cbl |= (len & TD_BL_MASK);
 
@@ -400,19 +259,11 @@ td_fill(struct admhcd *ahcd, u32 info, dma_addr_t data, int len,
 	td->hwINFO = cpu_to_hc32(ahcd, info);
 	td->hwDBP = cpu_to_hc32(ahcd, data);
 	td->hwCBL = cpu_to_hc32(ahcd, cbl);
-	td->hwNextTD = cpu_to_hc32(ahcd, td_pt->td_dma);
-
-	/* append to queue */
-	list_add_tail(&td->td_list, &td->ed->td_list);
 
-	/* hash it for later reverse mapping */
-	hash = TD_HASH_FUNC(td->td_dma);
-	td->td_hash = ahcd->td_hash[hash];
-	ahcd->td_hash[hash] = td;
+	if (up->td_idx > 0)
+		up->td[up->td_idx-1]->hwNextTD = cpu_to_hc32(ahcd, td->td_dma);
 
-	/* HC might read the TD (or cachelines) right away ... */
-	wmb();
-	td->ed->hwTailP = td->hwNextTD;
+	up->td_idx++;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -430,9 +281,7 @@ static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
 	int		cnt = 0;
 	u32		info = 0;
 	int		is_out = usb_pipeout(urb->pipe);
-	int		periodic = 0;
 	u32		toggle = 0;
-	struct td	*td;
 
 	/* OHCI handles the bulk/interrupt data toggles itself.  We just
 	 * use the device toggle bits for resetting, and rely on the fact
@@ -448,7 +297,6 @@ static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
 	}
 
 	urb_priv->td_idx = 0;
-	list_add(&urb_priv->pending, &ahcd->pending);
 
 	if (data_len)
 		data = urb->transfer_dma;
@@ -469,7 +317,7 @@ static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
 		info |= (urb->start_frame & TD_FN_MASK);
 		info |= (urb->interval & TD_ISI_MASK) << TD_ISI_SHIFT;
 
-		td_fill(ahcd, info, data, data_len, urb, cnt);
+		td_fill(ahcd, info, data, data_len, urb_priv);
 		cnt++;
 
 		admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs++;
@@ -483,20 +331,20 @@ static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
 		/* TDs _could_ transfer up to 8K each */
 		while (data_len > TD_DATALEN_MAX) {
 			td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle),
-				data, TD_DATALEN_MAX, urb, cnt);
+				data, TD_DATALEN_MAX, urb_priv);
 			data += TD_DATALEN_MAX;
 			data_len -= TD_DATALEN_MAX;
 			cnt++;
 		}
 
 		td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), data,
-			data_len, urb, cnt);
+			data_len, urb_priv);
 		cnt++;
 
 		if ((urb->transfer_flags & URB_ZERO_PACKET)
 				&& (cnt < urb_priv->td_cnt)) {
 			td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle),
-				0, 0, urb, cnt);
+				0, 0, urb_priv);
 			cnt++;
 		}
 		break;
@@ -507,21 +355,24 @@ static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
 	case PIPE_CONTROL:
 		/* fill a TD for the setup */
 		info = TD_SCC_NOTACCESSED | TD_DP_SETUP | TD_T_DATA0;
-		td_fill(ahcd, info, urb->setup_dma, 8, urb, cnt++);
+		td_fill(ahcd, info, urb->setup_dma, 8, urb_priv);
+		cnt++;
 
 		if (data_len > 0) {
 			/* fill a TD for the data */
 			info = TD_SCC_NOTACCESSED | TD_T_DATA1;
 			info |= is_out ? TD_DP_OUT : TD_DP_IN;
 			/* NOTE:  mishandles transfers >8K, some >4K */
-			td_fill(ahcd, info, data, data_len, urb, cnt++);
+			td_fill(ahcd, info, data, data_len, urb_priv);
+			cnt++;
 		}
 
 		/* fill a TD for the ACK */
 		info = (is_out || data_len == 0)
 			? TD_SCC_NOTACCESSED | TD_DP_IN | TD_T_DATA1
 			: TD_SCC_NOTACCESSED | TD_DP_OUT | TD_T_DATA1;
-		td_fill(ahcd, info, data, 0, urb, cnt++);
+		td_fill(ahcd, info, data, 0, urb_priv);
+		cnt++;
 
 		break;
 
@@ -538,7 +389,8 @@ static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
 			frame &= TD_FN_MASK;
 			td_fill(ahcd, info | frame,
 				data + urb->iso_frame_desc[cnt].offset,
-				urb->iso_frame_desc[cnt].length, urb, cnt);
+				urb->iso_frame_desc[cnt].length,
+				urb_priv);
 		}
 		admhcd_to_hcd(ahcd)->self.bandwidth_isoc_reqs++;
 		break;
@@ -546,20 +398,22 @@ static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
 
 	if (urb_priv->td_cnt != cnt)
 		admhc_err(ahcd, "bad number of tds created for urb %p\n", urb);
-}
 
-/*-------------------------------------------------------------------------*
- * Done List handling functions
- *-------------------------------------------------------------------------*/
+	urb_priv->td_idx = 0;
+}
 
 /* calculate transfer length/status and update the urb
  * PRECONDITION:  irqsafe (only for urb->status locking)
  */
-static void td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
+static int td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
 {
 	u32	info = hc32_to_cpup(ahcd, &td->hwINFO);
+	u32	dbp = hc32_to_cpup(ahcd, &td->hwDBP);
+	u32	cbl = TD_BL_GET(hc32_to_cpup(ahcd, &td->hwCBL));
 	int	type = usb_pipetype(urb->pipe);
-	int	cc = TD_CC_NOERROR;
+	int	cc;
+
+	cc = TD_CC_GET(info);
 
 	/* ISO ... drivers see per-TD length/status */
 	if (type == PIPE_ISOCHRONOUS) {
@@ -576,16 +430,17 @@ static void td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
 			return;
 
 		if (usb_pipeout (urb->pipe))
-			dlen = urb->iso_frame_desc [td->index].length;
+			dlen = urb->iso_frame_desc[td->index].length;
 		else {
 			/* short reads are always OK for ISO */
 			if (cc == TD_DATAUNDERRUN)
 				cc = TD_CC_NOERROR;
 			dlen = tdPSW & 0x3ff;
 		}
+
 		urb->actual_length += dlen;
-		urb->iso_frame_desc [td->index].actual_length = dlen;
-		urb->iso_frame_desc [td->index].status = cc_to_error [cc];
+		urb->iso_frame_desc[td->index].actual_length = dlen;
+		urb->iso_frame_desc[td->index].status = cc_to_error[cc];
 
 		if (cc != TD_CC_NOERROR)
 			admhc_vdbg (ahcd,
@@ -597,39 +452,15 @@ static void td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
 	 * might not be reported as errors.
 	 */
 	} else {
-		u32	bl = TD_BL_GET(hc32_to_cpup(ahcd, &td->hwCBL));
-		u32	tdDBP = hc32_to_cpup(ahcd, &td->hwDBP);
-
-		cc = TD_CC_GET(info);
-
-		/* update packet status if needed (short is normally ok) */
-		if (cc == TD_CC_DATAUNDERRUN
-				&& !(urb->transfer_flags & URB_SHORT_NOT_OK))
-			cc = TD_CC_NOERROR;
-
-		if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0) {
-			admhc_dump_ed(ahcd, "CC ERROR", td->ed, 1);
-			spin_lock(&urb->lock);
-			if (urb->status == -EINPROGRESS)
-				urb->status = cc_to_error[cc];
-			spin_unlock(&urb->lock);
-		}
+		admhc_dump_td(ahcd, "td_done", td);
 
 		/* count all non-empty packets except control SETUP packet */
-		if ((type != PIPE_CONTROL || td->index != 0) && tdDBP != 0) {
-			urb->actual_length += tdDBP - td->data_dma + bl;
+		if ((type != PIPE_CONTROL || td->index != 0) && dbp != 0) {
+			urb->actual_length += dbp - td->data_dma + cbl;
 		}
-
-		if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0)
-			admhc_vdbg(ahcd,
-				"urb %p td %p (%d) cc %d, len=%d/%d\n",
-				urb, td, td->index, cc,
-				urb->actual_length,
-				urb->transfer_buffer_length);
 	}
 
-	list_del(&td->td_list);
-
+	return cc;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -637,6 +468,7 @@ static void td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
 static inline struct td *
 ed_halted(struct admhcd *ahcd, struct td *td, int cc, struct td *rev)
 {
+#if 0
 	struct urb		*urb = td->urb;
 	struct ed		*ed = td->ed;
 	struct list_head	*tmp = td->td_list.next;
@@ -708,195 +540,111 @@ ed_halted(struct admhcd *ahcd, struct td *td, int cc, struct td *rev)
 	}
 
 	return rev;
+#else
+	return NULL;
+#endif
 }
 
 /*-------------------------------------------------------------------------*/
 
-/* there are some urbs/eds to unlink; called in_irq(), with HCD locked */
-static void
-finish_unlinks(struct admhcd *ahcd, u16 tick)
+static int ed_next_urb(struct admhcd *ahcd, struct ed *ed)
 {
-	struct ed	*ed, **last;
+	struct urb_priv *up;
+	u32 carry;
 
-rescan_all:
-	for (last = &ahcd->ed_rm_list, ed = *last; ed != NULL; ed = *last) {
-		struct list_head	*entry, *tmp;
-		int			completed, modified;
-		__hc32			*prev;
+	if (ed->state != ED_IDLE)
+		return 1;
 
-		/* only take off EDs that the HC isn't using, accounting for
-		 * frame counter wraps and EDs with partially retired TDs
-		 */
-		if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))) {
-			if (tick_before (tick, ed->tick)) {
-skip_ed:
-				last = &ed->ed_rm_next;
-				continue;
-			}
+	if (ed->urb_active)
+		return 1;
 
-			if (!list_empty (&ed->td_list)) {
-				struct td	*td;
-				u32		head;
+	if (list_empty(&ed->urb_pending))
+		return 0;
 
-				td = list_entry(ed->td_list.next, struct td,
-							td_list);
-				head = hc32_to_cpu(ahcd, ed->hwHeadP) &
-								TD_MASK;
-
-				/* INTR_WDH may need to clean up first */
-				if (td->td_dma != head)
-					goto skip_ed;
-			}
-		}
-
-		/* reentrancy:  if we drop the schedule lock, someone might
-		 * have modified this list.  normally it's just prepending
-		 * entries (which we'd ignore), but paranoia won't hurt.
-		 */
-		*last = ed->ed_rm_next;
-		ed->ed_rm_next = NULL;
-		modified = 0;
-
-		/* unlink urbs as requested, but rescan the list after
-		 * we call a completion since it might have unlinked
-		 * another (earlier) urb
-		 *
-		 * When we get here, the HC doesn't see this ed.  But it
-		 * must not be rescheduled until all completed URBs have
-		 * been given back to the driver.
-		 */
-rescan_this:
-		completed = 0;
-		prev = &ed->hwHeadP;
-		list_for_each_safe (entry, tmp, &ed->td_list) {
-			struct td	*td;
-			struct urb	*urb;
-			struct urb_priv	*urb_priv;
-			__hc32		savebits;
-
-			td = list_entry(entry, struct td, td_list);
-			urb = td->urb;
-			urb_priv = td->urb->hcpriv;
-
-			if (urb->status == -EINPROGRESS) {
-				prev = &td->hwNextTD;
-				continue;
-			}
-
-			if ((urb_priv) == NULL)
-				continue;
+	up = list_entry(ed->urb_pending.next, struct urb_priv, pending);
+	list_del(&up->pending);
+	ed->urb_active = up;
+	ed->state = ED_OPER;
 
-			/* patch pointer hc uses */
-			savebits = *prev & ~cpu_to_hc32(ahcd, TD_MASK);
-			*prev = td->hwNextTD | savebits;
+#ifdef ADMHC_VERBOSE_DEBUG
+	urb_print(ahcd, up->urb, "NEXT", 0);
+	admhc_dump_ed(ahcd, " ", ed, 0);
+#endif
 
-			/* HC may have partly processed this TD */
-			urb_print(urb, "PARTIAL",1);
-			td_done(ahcd, urb, td);
-			urb_priv->td_idx++;
+	up->td[up->td_cnt-1]->hwNextTD = cpu_to_hc32(ahcd, ed->dummy->td_dma);
 
-			/* if URB is done, clean up */
-			if (urb_priv->td_idx == urb_priv->td_cnt) {
-				modified = completed = 1;
-				finish_urb(ahcd, urb);
-			}
-		}
-		if (completed && !list_empty (&ed->td_list))
-			goto rescan_this;
-
-		/* ED's now officially unlinked, hc doesn't see */
-		ed->state = ED_IDLE;
-		ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H);
-		ed->hwNextED = 0;
-		wmb ();
-		ed->hwINFO &= ~cpu_to_hc32 (ahcd, ED_SKIP | ED_DEQUEUE);
-
-		/* but if there's work queued, reschedule */
-		if (!list_empty (&ed->td_list)) {
-			if (HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))
-				ed_schedule(ahcd, ed);
-		}
+	admhc_dma_lock(ahcd);
+	carry = hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_C;
+	ed->hwHeadP = cpu_to_hc32(ahcd, up->td[0]->td_dma | carry);
+	ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
+	admhc_dma_unlock(ahcd);
 
-		if (modified)
-			goto rescan_all;
-	}
+	return 1;
 }
 
-/*-------------------------------------------------------------------------*/
+static void ed_update(struct admhcd *ahcd, struct ed *ed, int partial)
+{
+	struct urb_priv *up;
+	struct urb *urb;
+	int cc;
 
-/*
- * Process normal completions (error or success) and clean the schedules.
- *
- * This is the main path for handing urbs back to drivers.  The only other
- * path is finish_unlinks(), which unlinks URBs using ed_rm_list, instead of
- * scanning the (re-reversed) donelist as this does.
- */
+	up = ed->urb_active;
+	if (!up)
+		return;
 
-static void ed_update(struct admhcd *ahcd, struct ed *ed)
-{
-	struct list_head *entry,*tmp;
+	urb = up->urb;
 
-	admhc_dump_ed(ahcd, "ed update", ed, 1);
+#ifdef ADMHC_VERBOSE_DEBUG
+	urb_print(ahcd, urb, "UPDATE", 0);
+#endif
+	admhc_dump_ed(ahcd, "ED-UPDATE", ed, 1);
 
-	list_for_each_safe(entry, tmp, &ed->td_list) {
-		struct td *td = list_entry(entry, struct td, td_list);
-		struct urb *urb = td->urb;
-		struct urb_priv *urb_priv = urb->hcpriv;
+	cc = TD_CC_NOERROR;
+	for (; up->td_idx < up->td_cnt; up->td_idx++) {
+		struct td *td = up->td[up->td_idx];
 
 		if (hc32_to_cpup(ahcd, &td->hwINFO) & TD_OWN)
 			break;
 
-		/* update URB's length and status from TD */
-		td_done(ahcd, urb, td);
-		urb_priv->td_idx++;
+		cc = td_done(ahcd, urb, td);
+		if (cc != TD_CC_NOERROR) {
+			admhc_vdbg(ahcd,
+				"urb %p td %p (%d) cc %d, len=%d/%d\n",
+				urb, td, td->index, cc,
+				urb->actual_length,
+				urb->transfer_buffer_length);
 
-		/* If all this urb's TDs are done, call complete() */
-		if (urb_priv->td_idx == urb_priv->td_cnt)
-			finish_urb(ahcd, urb);
+			up->td_idx = up->td_cnt;
+			break;
+		}
+	}
 
-		/* clean schedule:  unlink EDs that are no longer busy */
-		if (list_empty(&ed->td_list)) {
-			if (ed->state == ED_OPER)
-				start_ed_unlink(ahcd, ed);
+	if ((up->td_idx != up->td_cnt) && (!partial))
+		/* the URB is not completed yet */
+		return;
 
-		/* ... reenabling halted EDs only after fault cleanup */
-		} else if ((ed->hwINFO & cpu_to_hc32 (ahcd,
-						ED_SKIP | ED_DEQUEUE))
-					== cpu_to_hc32 (ahcd, ED_SKIP)) {
-			td = list_entry(ed->td_list.next, struct td, td_list);
-#if 0
-			if (!(td->hwINFO & cpu_to_hc32 (ahcd, TD_DONE))) {
-				ed->hwINFO &= ~cpu_to_hc32 (ahcd, ED_SKIP);
-				/* ... hc may need waking-up */
-				switch (ed->type) {
-				case PIPE_CONTROL:
-					admhc_writel (ahcd, OHCI_CLF,
-						&ahcd->regs->cmdstatus);
-					break;
-				case PIPE_BULK:
-					admhc_writel (ahcd, OHCI_BLF,
-						&ahcd->regs->cmdstatus);
-					break;
-				}
-			}
-#else
-			if ((td->hwINFO & cpu_to_hc32(ahcd, TD_OWN)))
-				ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
-#endif
-		}
+	/* update packet status if needed (short is normally ok) */
+	if (cc == TD_CC_DATAUNDERRUN
+			&& !(urb->transfer_flags & URB_SHORT_NOT_OK))
+		cc = TD_CC_NOERROR;
 
+	if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0) {
+		spin_lock(&urb->lock);
+		if (urb->status == -EINPROGRESS)
+			urb->status = cc_to_error[cc];
+		spin_unlock(&urb->lock);
 	}
-}
 
-static void ed_halt(struct admhcd *ahcd, struct ed *ed)
-{
-	admhc_dump_ed(ahcd, "ed_halt", ed, 1);
+	finish_urb(ahcd, urb);
+
+	ed->urb_active = NULL;
+	ed->state = ED_IDLE;
 }
 
 /* there are some tds completed; called in_irq(), with HCD locked */
 static void admhc_td_complete(struct admhcd *ahcd)
 {
-	struct ed	*ed;
+	struct ed *ed;
 
 	for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
 		if (ed->state != ED_OPER)
@@ -906,10 +654,59 @@ static void admhc_td_complete(struct admhcd *ahcd)
 			continue;
 
 		if (hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) {
-			ed_halt(ahcd, ed);
+			/* TODO */
+			continue;
+		}
+
+		ed_update(ahcd, ed, 0);
+	}
+}
+
+/* there are some urbs/eds to unlink; called in_irq(), with HCD locked */
+static void admhc_finish_unlinks(struct admhcd *ahcd, u16 tick)
+{
+	struct ed *ed;
+
+	for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
+		if (ed->state != ED_UNLINK)
 			continue;
+
+		if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state)))
+			if (tick_before(tick, ed->tick))
+				continue;
+
+		/* process partial status */
+		ed_update(ahcd, ed, 1);
+	}
+}
+
+static void admhc_sof_refill(struct admhcd *ahcd)
+{
+	struct ed *ed;
+	int disable_dma = 1;
+
+	for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
+
+		if (hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) {
+			ed_update(ahcd, ed, 1);
+			ed->hwHeadP &= ~cpu_to_hc32 (ahcd, ED_H);
 		}
 
-		ed_update(ahcd, ed);
+		if (ed_next_urb(ahcd, ed)) {
+			disable_dma = 0;
+		} else {
+			struct ed *tmp;
+			tmp = ed->ed_prev;
+			ed_deschedule(ahcd, ed);
+			ed = tmp;
+		}
+	}
+
+	if (disable_dma) {
+		admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
+		admhc_dma_disable(ahcd);
+	} else {
+		admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
+		admhc_dma_enable(ahcd);
 	}
 }
diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120.h b/target/linux/adm5120/files/drivers/usb/host/adm5120.h
index 95616f27a88..370722547e2 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120.h
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120.h
@@ -56,7 +56,8 @@ struct ed {
 	dma_addr_t		dma;		/* addr of ED */
 	struct td		*dummy;		/* next TD to activate */
 
-	struct list_head	urb_list;	/* list of our URBs */
+	struct urb_priv		*urb_active;	/* active URB */
+	struct list_head	urb_pending;	/* pending URBs */
 
 	struct list_head	ed_list;	/* list of all EDs*/
 	struct list_head	rm_list;	/* for remove list */
@@ -65,16 +66,15 @@ struct ed {
 	struct ed		*ed_next;	/* on schedule list */
 	struct ed		*ed_prev;	/* for non-interrupt EDs */
 	struct ed		*ed_rm_next;	/* on rm list */
-	struct ed		*ed_soft_list;	/* on software int list */
-	struct list_head	td_list;	/* "shadow list" of our TDs */
 
 	/* create --> IDLE --> OPER --> ... --> IDLE --> destroy
 	 * usually:  OPER --> UNLINK --> (IDLE | OPER) --> ...
 	 */
-	u8			state;		/* ED_{IDLE,UNLINK,OPER} */
-#define ED_IDLE		0x00		/* NOT linked to HC */
-#define ED_UNLINK	0x01		/* being unlinked from hc */
-#define ED_OPER		0x02		/* IS linked to hc */
+	u8			state;
+#define ED_NEW		0x00		/* just allocated */
+#define ED_IDLE		0x01		/* linked into HC, but not running */
+#define ED_OPER		0x02		/* linked into HC and running */
+#define ED_UNLINK	0x03		/* being unlinked from HC */
 
 	u8			type;		/* PIPE_{BULK,...} */
 
@@ -115,16 +115,17 @@ struct td {
 #define TD_T_SHIFT	23			/* data toggle state */
 #define TD_T_MASK	0x3
 #define TD_T		(TD_T_MASK << TD_T_SHIFT)
-#define TD_T_DATA0	(0x2 << TD_T_SHIFT)		/* DATA0 */
-#define TD_T_DATA1	(0x3 << TD_T_SHIFT)		/* DATA1 */
-#define TD_T_CARRY	(0x0 << TD_T_SHIFT)		/* uses ED_C */
+#define TD_T_DATA0	(0x2 << TD_T_SHIFT)	/* DATA0 */
+#define TD_T_DATA1	(0x3 << TD_T_SHIFT)	/* DATA1 */
+#define TD_T_CARRY	(0x0 << TD_T_SHIFT)	/* uses ED_C */
 #define TD_T_GET(x)	(((x) >> TD_T_SHIFT) & TD_T_MASK)
 #define TD_DP_SHIFT	21			/* direction/pid */
 #define TD_DP_MASK	0x3
 #define TD_DP		(TD_DP_MASK << TD_DP_SHIFT)
-#define TD_DP_SETUP	(0x0 << TD_DP_SHIFT)		/* SETUP pid */
-#define TD_DP_OUT	(0x1 << TD_DP_SHIFT)		/* OUT pid */
-#define TD_DP_IN	(0x2 << TD_DP_SHIFT)		/* IN pid */
+#define TD_DP_SETUP	(0x0 << TD_DP_SHIFT)	/* SETUP pid */
+#define TD_DP_OUT	(0x1 << TD_DP_SHIFT)	/* OUT pid */
+#define TD_DP_IN	(0x2 << TD_DP_SHIFT)	/* IN pid */
+#define TD_DP_GET(x)	(((x) >> TD_DP_SHIFT) & TD_DP_MASK)
 #define TD_ISI_SHIFT	8			/* Interrupt Service Interval */
 #define TD_ISI_MASK	0x3f
 #define TD_ISI_GET(x)	(((x) >> TD_ISI_SHIFT) & TD_ISI_MASK)
@@ -142,19 +143,12 @@ struct td {
 
 	/* rest are purely for the driver's use */
 	__u8		index;
-	struct ed	*ed;
-	struct td	*td_hash;	/* dma-->td hashtable */
-	struct td	*next_dl_td;
+/*	struct ed	*ed;*/
 	struct urb	*urb;
 
 	dma_addr_t	td_dma;		/* addr of this TD */
 	dma_addr_t	data_dma;	/* addr of data it points to */
 
-	struct list_head td_list;	/* "shadow list", TDs on same ED */
-
-	u32		flags;
-#define TD_FLAG_DONE	(1 << 17)	/* retired to done list */
-#define TD_FLAG_ISO	(1 << 16)	/* copy of ED_ISO */
 } __attribute__ ((aligned(TD_ALIGN)));	/* c/b/i need 16; only iso needs 32 */
 
 /*
@@ -354,6 +348,7 @@ struct admhcd_regs {
 /* hcd-private per-urb state */
 struct urb_priv {
 	struct ed		*ed;
+	struct urb		*urb;
 	struct list_head	pending;	/* URBs on the same ED */
 
 	u32			td_cnt;		/* # tds in this request */
@@ -374,6 +369,8 @@ struct urb_priv {
 
 struct admhcd {
 	spinlock_t		lock;
+	spinlock_t		dma_lock;
+	u32			dma_state;
 
 	/*
 	 * I/O memory used to communicate with the HC (dma-consistent)
@@ -384,14 +381,10 @@ struct admhcd {
 	 * hcd adds to schedule for a live hc any time, but removals finish
 	 * only at the start of the next frame.
 	 */
-
 	struct ed		*ed_head;
 	struct ed		*ed_tails[4];
 
 	struct ed		*ed_rm_list;	/* to be removed */
-	struct ed		*ed_halt_list;	/* halted due to an error */
-	struct ed		*ed_soft_list;	/* for software interrupt processing */
-
 	struct ed		*periodic[NUM_INTS];	/* shadow int_table */
 
 #if 0	/* TODO: remove? */
@@ -408,7 +401,6 @@ struct admhcd {
 	struct dma_pool		*td_cache;
 	struct dma_pool		*ed_cache;
 	struct td		*td_hash[TD_HASH_SIZE];
-	struct list_head	pending;
 
 	/*
 	 * driver state
@@ -446,6 +438,7 @@ static inline struct usb_hcd *admhcd_to_hcd(const struct admhcd *ahcd)
 #define STUB_DEBUG_FILES
 #endif	/* DEBUG */
 
+#if 0
 #define admhc_dbg(ahcd, fmt, args...) \
 	dev_dbg(admhcd_to_hcd(ahcd)->self.controller , fmt , ## args )
 #define admhc_err(ahcd, fmt, args...) \
@@ -460,6 +453,22 @@ static inline struct usb_hcd *admhcd_to_hcd(const struct admhcd *ahcd)
 #else
 #	define admhc_vdbg(ahcd, fmt, args...) do { } while (0)
 #endif
+#else
+#define admhc_dbg(ahcd, fmt, args...) \
+	printk(KERN_DEBUG "adm5120-hcd: " fmt , ## args )
+#define admhc_err(ahcd, fmt, args...) \
+	printk(KERN_ERR "adm5120-hcd: " fmt , ## args )
+#define ahcd_info(ahcd, fmt, args...) \
+	printk(KERN_INFO "adm5120-hcd: " fmt , ## args )
+#define admhc_warn(ahcd, fmt, args...) \
+	printk(KERN_WARNING "adm5120-hcd: " fmt , ## args )
+
+#ifdef ADMHC_VERBOSE_DEBUG
+#	define admhc_vdbg admhc_dbg
+#else
+#	define admhc_vdbg(ahcd, fmt, args...) do { } while (0)
+#endif
+#endif
 
 /*-------------------------------------------------------------------------*/
 
@@ -633,6 +642,15 @@ static inline u16 admhc_frame_no(const struct admhcd *ahcd)
 	return (u16)t;
 }
 
+static inline u16 admhc_frame_remain(const struct admhcd *ahcd)
+{
+	u32	t;
+
+	t = admhc_readl(ahcd, &ahcd->regs->fmnumber) >> ADMHC_SFN_FR_SHIFT;
+	t &= ADMHC_SFN_FR_MASK;
+	return (u16)t;
+}
+
 /*-------------------------------------------------------------------------*/
 
 static inline void admhc_disable(struct admhcd *ahcd)
@@ -652,7 +670,7 @@ static inline void periodic_reinit(struct admhcd *ahcd)
 
 	/* TODO: adjust FSLargestDataPacket value too? */
 	admhc_writel(ahcd, (fit ^ FIT) | ahcd->fminterval,
-						&ahcd->regs->fminterval);
+					&ahcd->regs->fminterval);
 }
 
 static inline u32 admhc_get_rhdesc(struct admhcd *ahcd)
@@ -698,17 +716,45 @@ static inline void admhc_intr_ack(struct admhcd *ahcd, u32 ints)
 
 static inline void admhc_dma_enable(struct admhcd *ahcd)
 {
-	ahcd->host_control = admhc_readl(ahcd, &ahcd->regs->host_control);
-	if (ahcd->host_control & ADMHC_HC_DMAE)
+	u32 t;
+
+	t = admhc_readl(ahcd, &ahcd->regs->host_control);
+	if (t & ADMHC_HC_DMAE)
 		return;
 
-	ahcd->host_control |= ADMHC_HC_DMAE;
-	admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
+	t |= ADMHC_HC_DMAE;
+	admhc_writel(ahcd, t, &ahcd->regs->host_control);
+	admhc_dbg(ahcd,"DMA enabled\n");
 }
 
 static inline void admhc_dma_disable(struct admhcd *ahcd)
 {
-	ahcd->host_control = admhc_readl(ahcd, &ahcd->regs->host_control);
-	ahcd->host_control &= ~ADMHC_HC_DMAE;
-	admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
+	u32 t;
+
+	t = admhc_readl(ahcd, &ahcd->regs->host_control);
+	if (!(t & ADMHC_HC_DMAE))
+		return;
+
+	t &= ~ADMHC_HC_DMAE;
+	admhc_writel(ahcd, t, &ahcd->regs->host_control);
+	admhc_dbg(ahcd,"DMA disabled\n");
+}
+
+static inline void admhc_dma_lock(struct admhcd *ahcd)
+{
+	spin_lock(ahcd->dma_lock);
+
+	ahcd->dma_state = admhc_readl(ahcd, &ahcd->regs->host_control);
+	admhc_writel(ahcd, 0, &ahcd->regs->hosthead);
+	admhc_writel(ahcd, ahcd->dma_state & ~ADMHC_HC_DMAE,
+				&ahcd->regs->host_control);
+	admhc_dbg(ahcd,"DMA locked\n");
+}
+
+static inline void admhc_dma_unlock(struct admhcd *ahcd)
+{
+	admhc_writel(ahcd, (u32)ahcd->ed_head->dma, &ahcd->regs->hosthead);
+	admhc_writel(ahcd, ahcd->dma_state, &ahcd->regs->host_control);
+	admhc_dbg(ahcd,"DMA unlocked\n");
+	spin_unlock(ahcd->dma_lock);
 }
-- 
2.30.2