Merge with Linux 2.3.43.

1 files changed, 2214 insertions, 0 deletions

diff --git a/drivers/usb/uhci.c b/drivers/usb/uhci.c
new file mode 100644
index 000000000..d18fc30cb
--- /dev/null
+++ b/drivers/usb/uhci.c
@@ -0,0 +1,2214 @@
+/*
+ * Universal Host Controller Interface driver for USB.
+ *
+ * (C) Copyright 1999 Linus Torvalds
+ * (C) Copyright 1999-2000 Johannes Erdfelt, jerdfelt@sventech.com
+ * (C) Copyright 1999 Randy Dunlap
+ * (C) Copyright 1999 Georg Acher, acher@in.tum.de
+ * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
+ * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
+ * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
+ *
+ * Intel documents this fairly well, and as far as I know there
+ * are no royalties or anything like that, but even so there are
+ * people who decided that they want to do the same thing in a
+ * completely different way.
+ *
+ * WARNING! The USB documentation is downright evil. Most of it
+ * is just crap, written by a committee. You're better off ignoring
+ * most of it, the important stuff is:
+ *  - the low-level protocol (fairly simple but lots of small details)
+ *  - working around the horridness of the rest
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/malloc.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+
+#define DEBUG
+#include "usb.h"
+
+#include "uhci.h"
+#include "uhci-debug.h"
+
+#ifdef CONFIG_APM
+#include <linux/apm_bios.h>
+static int handle_apm_event(apm_event_t event);
+#endif
+
+static int debug = 1;
+MODULE_PARM(debug, "i");
+
+static kmem_cache_t *uhci_td_cachep;
+static kmem_cache_t *uhci_qh_cachep;
+
+static LIST_HEAD(uhci_list);
+
+static int rh_submit_urb(urb_t *urb);
+static int rh_unlink_urb(urb_t *urb);
+static int uhci_get_current_frame_number(struct usb_device *usb_dev);
+
+#define min(a,b) (((a)<(b))?(a):(b))
+
+/*
+ * Only the USB core should call uhci_alloc_dev and uhci_free_dev
+ */
+static int uhci_alloc_dev(struct usb_device *usb_dev)
+{
+	struct uhci_device *dev;
+
+	/* Allocate the UHCI device private data */
+	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -1;
+
+	/* Initialize "dev" */
+	memset(dev, 0, sizeof(*dev));
+
+	usb_dev->hcpriv = dev;
+	dev->usb = usb_dev;
+	atomic_set(&dev->refcnt, 1);
+
+	if (usb_dev->parent)
+		dev->uhci = usb_to_uhci(usb_dev->parent)->uhci;
+
+	return 0;
+}
+
+static int uhci_free_dev(struct usb_device *usb_dev)
+{
+	struct uhci_device *dev = usb_to_uhci(usb_dev);
+
+	if (atomic_dec_and_test(&dev->refcnt))
+		kfree(dev);
+
+	return 0;
+}
+
+static void uhci_inc_dev_use(struct uhci_device *dev)
+{
+	atomic_inc(&dev->refcnt);
+}
+
+static void uhci_dec_dev_use(struct uhci_device *dev)
+{
+	uhci_free_dev(dev->usb);
+}
+
+/*
+ * UHCI interrupt list operations..
+ */
+static void uhci_add_irq_list(struct uhci *uhci, struct uhci_td *td)
+{
+	unsigned long flags;
+
+	nested_lock(&uhci->irqlist_lock, flags);
+	list_add(&td->irq_list, &uhci->interrupt_list);
+	nested_unlock(&uhci->irqlist_lock, flags);
+}
+
+static void uhci_remove_irq_list(struct uhci *uhci, struct uhci_td *td)
+{
+	unsigned long flags;
+
+	nested_lock(&uhci->irqlist_lock, flags);
+	if (td->irq_list.next != &td->irq_list) {
+		list_del(&td->irq_list);
+		INIT_LIST_HEAD(&td->irq_list);
+	}
+	nested_unlock(&uhci->irqlist_lock, flags);
+}
+
+static void uhci_add_urb_list(struct uhci *uhci, struct urb *urb)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->urblist_lock, flags);
+	list_add(&urb->urb_list, &uhci->urb_list);
+	spin_unlock_irqrestore(&uhci->urblist_lock, flags);
+}
+
+static void uhci_remove_urb_list(struct uhci *uhci, struct urb *urb)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->urblist_lock, flags);
+	if (urb->urb_list.next != &urb->urb_list) {
+		list_del(&urb->urb_list);
+		INIT_LIST_HEAD(&urb->urb_list);
+	}
+	spin_unlock_irqrestore(&uhci->urblist_lock, flags);
+}
+
+/*
+ * We insert Isochronous transfers directly into the frame list at the
+ * beginning
+ * The layout looks as follows:
+ * frame list pointer -> iso td's (if any) ->
+ * periodic interrupt td (if frame 0) -> irq td's -> control qh -> bulk qh
+ */
+
+static void uhci_insert_td_frame_list(struct uhci *uhci, struct uhci_td *td, unsigned framenum)
+{
+	unsigned long flags;
+	struct uhci_td *nexttd;
+
+	framenum %= UHCI_NUMFRAMES;
+
+	spin_lock_irqsave(&uhci->framelist_lock, flags);
+	td->frameptr = &uhci->fl->frame[framenum];
+	td->link = uhci->fl->frame[framenum];
+	if (!(td->link & (UHCI_PTR_TERM | UHCI_PTR_QH))) {
+		nexttd = (struct uhci_td *)uhci_ptr_to_virt(td->link);
+		td->nexttd = nexttd;
+		nexttd->prevtd = td;
+		nexttd->frameptr = NULL;
+	}
+	uhci->fl->frame[framenum] = virt_to_bus(td);
+	spin_unlock_irqrestore(&uhci->framelist_lock, flags);
+}
+
+static void uhci_remove_td(struct uhci *uhci, struct uhci_td *td)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->framelist_lock, flags);
+	if (td->frameptr) {
+		*(td->frameptr) = td->link;
+		if (td->nexttd) {
+			td->nexttd->frameptr = td->frameptr;
+			td->nexttd->prevtd = NULL;
+			td->nexttd = NULL;
+		}
+		td->frameptr = NULL;
+	} else {
+		if (td->prevtd) {
+			td->prevtd->nexttd = td->nexttd;
+			td->prevtd->link = td->link;
+		}
+		if (td->nexttd)
+			td->nexttd->prevtd = td->prevtd;
+		td->prevtd = td->nexttd = NULL;
+	}
+	td->link = UHCI_PTR_TERM;
+	spin_unlock_irqrestore(&uhci->framelist_lock, flags);
+}
+
+static void uhci_insert_td(struct uhci *uhci, struct uhci_td *skeltd, struct uhci_td *td)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->framelist_lock, flags);
+
+	/* Fix the linked list pointers */
+	td->nexttd = skeltd->nexttd;
+	td->prevtd = skeltd;
+	if (skeltd->nexttd)
+		skeltd->nexttd->prevtd = td;
+	skeltd->nexttd = td;
+
+	td->link = skeltd->link;
+	skeltd->link = virt_to_bus(td);
+
+	spin_unlock_irqrestore(&uhci->framelist_lock, flags);
+}
+
+/*
+ * Inserts a td into qh list at the top.
+ */
+static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct uhci_td *begin)
+{
+	struct uhci_td *td, *prevtd;
+
+	if (!begin)		/* Nothing to do */
+		return;
+
+	/* Grab the first TD and add it to the QH */
+	td = begin;
+	qh->element = virt_to_bus(td) | UHCI_PTR_DEPTH;
+
+	/* Go through the rest of the TD's, link them together */
+	prevtd = td;
+	td = td->next;
+	while (td) {
+		prevtd->link = virt_to_bus(td) | UHCI_PTR_DEPTH;
+
+		prevtd = td;
+		td = td->next;
+	}
+
+	prevtd->link = UHCI_PTR_TERM;
+}
+
+static struct uhci_td *uhci_td_alloc(struct uhci_device *dev)
+{
+	struct uhci_td *td;
+
+	td = kmem_cache_alloc(uhci_td_cachep, in_interrupt() ? SLAB_ATOMIC : SLAB_KERNEL);
+	if (!td)
+		return NULL;
+
+	td->link = UHCI_PTR_TERM;
+	td->buffer = 0;
+
+	td->frameptr = NULL;
+	td->nexttd = td->prevtd = NULL;
+	td->next = NULL;
+	td->dev = dev;
+	INIT_LIST_HEAD(&td->irq_list);
+	INIT_LIST_HEAD(&td->list);
+
+	uhci_inc_dev_use(dev);
+
+	return td;
+}
+
+static void uhci_td_free(struct uhci_td *td)
+{
+	kmem_cache_free(uhci_td_cachep, td);
+
+	if (td->dev)
+		uhci_dec_dev_use(td->dev);
+}
+
+static void uhci_schedule_delete_td(struct uhci *uhci, struct uhci_td *td)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->freelist_lock, flags);
+	list_add(&td->list, &uhci->td_free_list);
+	if (td->dev) {
+		uhci_dec_dev_use(td->dev);
+		td->dev = NULL;
+	}
+	spin_unlock_irqrestore(&uhci->freelist_lock, flags);
+}
+
+static struct uhci_qh *uhci_qh_alloc(struct uhci_device *dev)
+{
+	struct uhci_qh *qh;
+
+	qh = kmem_cache_alloc(uhci_qh_cachep, in_interrupt() ? SLAB_ATOMIC : SLAB_KERNEL);
+	if (!qh)
+		return NULL;
+
+	qh->element = UHCI_PTR_TERM;
+	qh->link = UHCI_PTR_TERM;
+
+	qh->dev = dev;
+	qh->prevqh = qh->nextqh = NULL;
+
+	INIT_LIST_HEAD(&qh->list);
+
+	uhci_inc_dev_use(dev);
+
+	return qh;
+}
+
+static void uhci_qh_free(struct uhci_qh *qh)
+{
+	kmem_cache_free(uhci_qh_cachep, qh);
+
+	if (qh->dev)
+		uhci_dec_dev_use(qh->dev);
+}
+
+static void uhci_schedule_delete_qh(struct uhci *uhci, struct uhci_qh *qh)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->freelist_lock, flags);
+	list_add(&qh->list, &uhci->qh_free_list);
+	if (qh->dev) {
+		uhci_dec_dev_use(qh->dev);
+		qh->dev = NULL;
+	}
+	spin_unlock_irqrestore(&uhci->freelist_lock, flags);
+}
+
+static void uhci_insert_qh(struct uhci *uhci, struct uhci_qh *skelqh, struct uhci_qh *qh)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->framelist_lock, flags);
+
+	/* Fix the linked list pointers */
+	qh->nextqh = skelqh->nextqh;
+	qh->prevqh = skelqh;
+	if (skelqh->nextqh)
+		skelqh->nextqh->prevqh = qh;
+	skelqh->nextqh = qh;
+
+	qh->link = skelqh->link;
+	skelqh->link = virt_to_bus(qh) | UHCI_PTR_QH;
+
+	spin_unlock_irqrestore(&uhci->framelist_lock, flags);
+}
+
+static void uhci_remove_qh(struct uhci *uhci, struct uhci_qh *qh)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->framelist_lock, flags);
+	if (qh->prevqh) {
+		qh->prevqh->nextqh = qh->nextqh;
+		qh->prevqh->link = qh->link;
+	}
+	if (qh->nextqh)
+		qh->nextqh->prevqh = qh->prevqh;
+	qh->prevqh = qh->nextqh = NULL;
+	spin_unlock_irqrestore(&uhci->framelist_lock, flags);
+}
+
+static void inline uhci_fill_td(struct uhci_td *td, __u32 status,
+		__u32 info, __u32 buffer)
+{
+	td->status = status;
+	td->info = info;
+	td->buffer = buffer;
+}
+
+static void uhci_add_td_to_urb(urb_t *urb, struct uhci_td *td)
+{
+	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+
+	td->urb = urb;
+
+	if (urbp->end)
+		urbp->end->next = td;
+
+	urbp->end = td;
+
+	if (!urbp->begin)
+		urbp->begin = td;
+}
+
+/*
+ * Map status to standard result codes
+ *
+ * <status> is (td->status & 0xFE0000) [a.k.a. uhci_status_bits(td->status)]
+ * <dir_out> is True for output TDs and False for input TDs.
+ */
+static int uhci_map_status(int status, int dir_out)
+{
+	if (!status)
+		return 0;
+	if (status & TD_CTRL_BITSTUFF)			/* Bitstuff error */
+		return -EPROTO;
+	if (status & TD_CTRL_CRCTIMEO) {		/* CRC/Timeout */
+		if (dir_out)
+			return -ETIMEDOUT;
+		else
+			return -EILSEQ;
+	}
+	if (status & TD_CTRL_NAK)			/* NAK */
+		return -ETIMEDOUT;
+	if (status & TD_CTRL_BABBLE)			/* Babble */
+		return -EPIPE;
+	if (status & TD_CTRL_DBUFERR)			/* Buffer error */
+		return -ENOSR;
+	if (status & TD_CTRL_STALLED)			/* Stalled */
+		return -EPIPE;
+	if (status & TD_CTRL_ACTIVE)			/* Active */
+		return 0;
+
+	return -EINVAL;
+}
+
+/*
+ * Control transfers
+ */
+static int uhci_submit_control(urb_t *urb)
+{
+	struct uhci_td *td;
+	struct uhci_qh *qh;
+	unsigned long destination, status;
+	struct uhci_device *dev = usb_to_uhci(urb->dev);
+	struct uhci *uhci = dev->uhci;
+	int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+	int len = urb->transfer_buffer_length;
+	unsigned char *data = urb->transfer_buffer;
+	struct urb_priv *urbp;
+
+	/* The "pipe" thing contains the destination in bits 8--18 */
+	destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
+
+	/* 3 errors */
+	status = (urb->pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | (3 << 27);
+
+	urbp = kmalloc(sizeof(*urbp), in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+	if (!urbp)
+		return -ENOMEM;
+
+	urbp->begin = urbp->end = NULL;
+
+	urb->hcpriv = urbp;
+
+	/*
+	 * Build the TD for the control request
+	 */
+	td = uhci_td_alloc(dev);
+	if (!td)
+		return -ENOMEM;
+
+	uhci_add_td_to_urb(urb, td);
+	uhci_fill_td(td, status, destination | (7 << 21),
+		virt_to_bus(urb->setup_packet));
+
+	/*
+	 * If direction is "send", change the frame from SETUP (0x2D)
+	 * to OUT (0xE1). Else change it from SETUP to IN (0x69).
+	 */
+	destination ^= (USB_PID_SETUP ^ usb_packetid(urb->pipe));
+
+	if (!(urb->transfer_flags & USB_DISABLE_SPD))
+		status |= TD_CTRL_SPD;
+
+	/*
+	 * Build the DATA TD's
+	 */
+	td = uhci_td_alloc(dev);
+	if (!td) {
+		/* FIXME: Free the TD's */
+		return -ENOMEM;
+	}
+
+	while (len > 0) {
+		int pktsze = len;
+
+		if (pktsze > maxsze)
+			pktsze = maxsze;
+
+		/* Alternate Data0/1 (start with Data1) */
+		destination ^= 1 << TD_TOKEN_TOGGLE;
+	
+		uhci_add_td_to_urb(urb, td);
+		uhci_fill_td(td, status, destination | ((pktsze - 1) << 21),
+			virt_to_bus(data));
+
+		data += pktsze;
+		len -= pktsze;
+
+		td = uhci_td_alloc(dev);
+		if (!td)
+			/* FIXME: Free all of the previously allocated td's */
+			return -ENOMEM;
+	}
+
+	/*
+	 * Build the final TD for control status 
+	 *
+	 * It's IN if the pipe is an output pipe or we're not expecting
+	 * data back.
+	 */
+	destination &= ~TD_PID;
+	if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length)
+		destination |= USB_PID_IN;
+	else
+		destination |= USB_PID_OUT;
+
+	destination |= 1 << TD_TOKEN_TOGGLE;		/* End in Data1 */
+
+	status &= ~TD_CTRL_SPD;
+
+	uhci_add_td_to_urb(urb, td);
+	uhci_fill_td(td, status | TD_CTRL_IOC,
+		destination | (UHCI_NULL_DATA_SIZE << 21), 0);
+
+	uhci_add_irq_list(uhci, td);
+
+	qh = uhci_qh_alloc(dev);
+	if (!qh) {
+		/* FIXME: Free all of the TD's */
+		return -ENOMEM;
+	}
+	uhci_insert_tds_in_qh(qh, urbp->begin);
+
+	uhci_insert_qh(uhci, &uhci->skel_control_qh, qh);
+	urbp->qh = qh;
+
+	uhci_add_urb_list(uhci, urb);
+
+	usb_inc_dev_use(urb->dev);
+
+	return -EINPROGRESS;
+}
+
+static int uhci_unlink_control(urb_t *urb)
+{
+	struct urb_priv *urbp = urb->hcpriv;
+	struct uhci_td *td;
+	struct uhci_device *dev = usb_to_uhci(urb->dev);
+	struct uhci *uhci = dev->uhci;
+
+	if (!urbp)
+		return -EINVAL;
+
+	uhci_remove_qh(uhci, urbp->qh);
+	uhci_schedule_delete_qh(uhci, urbp->qh);
+
+	/* Go through the rest of the TD's, deleting them, then scheduling */
+	/*  their deletion */
+	td = urbp->begin;
+	while (td) {
+		struct uhci_td *next = td->next;
+
+		if (td->status & TD_CTRL_IOC)
+			uhci_remove_irq_list(uhci, td);
+
+		uhci_schedule_delete_td(uhci, td);
+
+		td = next;
+	}
+
+	kfree(urbp);
+	urb->hcpriv = NULL;
+
+	uhci_remove_urb_list(uhci, urb);
+
+	return 0;
+}
+
+static int uhci_result_control(urb_t *urb)
+{
+	struct urb_priv *urbp = urb->hcpriv;
+	struct uhci_td *td;
+	unsigned int status;
+	int ret;
+
+	td = urbp->begin;
+	if (!td)		/* Nothing to do */
+		return -EINVAL;
+
+	/* The first TD is the SETUP phase, check the status, but skip */
+	/*  the count */
+	status =  uhci_status_bits(td->status);
+	if (status & TD_CTRL_ACTIVE)
+		return -EINPROGRESS;
+
+	if (status)
+		goto td_error;
+
+	urb->actual_length = 0;
+
+	/* The rest of the TD's (but the last) are data */
+	td = td->next;
+	while (td && td->next) {
+		status = uhci_status_bits(td->status);
+		if (status & TD_CTRL_ACTIVE)
+			return -EINPROGRESS;
+
+		urb->actual_length += uhci_actual_length(td->status);
+
+		/* If SPD is set then we received a short packet */
+		/*  There will be no status phase at the end */
+		if (td->status & TD_CTRL_SPD && (uhci_actual_length(td->status) < uhci_expected_length(td->info)))
+			goto td_success;
+
+		if (status)
+			goto td_error;
+
+		td = td->next;
+	}
+
+	/* Control status phase */
+	status = uhci_status_bits(td->status);
+
+	/* APC BackUPS Pro kludge */
+	/* It tries to send all of the descriptor instead of */
+	/*  the amount we requested */
+	if (td->status & TD_CTRL_IOC &&
+	    status & TD_CTRL_ACTIVE &&
+	    status & TD_CTRL_NAK)
+		goto td_success;
+
+	if (status & TD_CTRL_ACTIVE)
+		return -EINPROGRESS;
+
+	if (status)
+		goto td_error;
+
+td_success:
+	uhci_unlink_control(urb);
+
+	return 0;
+
+td_error:
+	/* Some debugging code */
+	if (debug) {
+		dbg("uhci_result_control() failed with status %x",
+			status);
+
+		/* Print the chain for debugging purposes */
+		uhci_show_queue(urbp->qh);
+	}
+
+	if (status & TD_CTRL_STALLED) {
+		/* endpoint has stalled - mark it halted */
+		usb_endpoint_halt(urb->dev, uhci_endpoint(td->info),
+	    			uhci_packetout(td->info));
+		uhci_unlink_control(urb);
+
+		return -EPIPE;
+	}
+
+	ret = uhci_map_status(status, uhci_packetout(td->info));
+
+	uhci_unlink_control(urb);
+
+	return ret;
+}
+
+/*
+ * Interrupt transfers
+ */
+static int uhci_submit_interrupt(urb_t *urb)
+{
+	struct uhci_td *td;
+	unsigned long destination, status;
+	struct uhci_device *dev = usb_to_uhci(urb->dev);
+	struct uhci *uhci = dev->uhci;
+	struct urb_priv *urbp;
+
+	if (urb->transfer_buffer_length > usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))
+		return -EINVAL;
+
+	/* The "pipe" thing contains the destination in bits 8--18 */
+	destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+
+	status = (urb->pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | TD_CTRL_SPD |
+			TD_CTRL_IOC;
+
+	urbp = kmalloc(sizeof(*urbp), in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+	if (!urbp)
+		return -ENOMEM;
+
+	urbp->begin = urbp->end = NULL;
+
+	urb->hcpriv = urbp;
+
+	td = uhci_td_alloc(dev);
+	if (!td)
+		return -ENOMEM;
+
+	destination |= (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE);
+	destination |= ((urb->transfer_buffer_length - 1) << 21);
+
+	uhci_add_td_to_urb(urb, td);
+	uhci_fill_td(td, status, destination,
+		virt_to_bus(urb->transfer_buffer));
+
+	uhci_add_irq_list(uhci, td);
+
+	uhci_insert_td(uhci, &uhci->skeltd[__interval_to_skel(urb->interval)], td);
+
+	uhci_add_urb_list(uhci, urb);
+
+	usb_inc_dev_use(urb->dev);
+
+	return -EINPROGRESS;
+}
+
+static int uhci_unlink_interrupt(urb_t *urb)
+{
+	struct urb_priv *urbp = urb->hcpriv;
+	struct uhci_td *td;
+	struct uhci_device *dev = usb_to_uhci(urb->dev);
+	struct uhci *uhci = dev->uhci;
+
+	if (!urbp)
+		return -EINVAL;
+
+	td = urbp->begin;
+	uhci_remove_td(uhci, td);
+	if (td->status & TD_CTRL_IOC)
+		uhci_remove_irq_list(uhci, td);
+	uhci_schedule_delete_td(uhci, td);
+
+	kfree(urbp);
+	urb->hcpriv = NULL;
+
+	uhci_remove_urb_list(uhci, urb);
+
+	return 0;
+}
+
+static int uhci_result_interrupt(urb_t *urb)
+{
+	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+	struct uhci_td *td;
+	int status;
+
+	if (!urbp)
+		return -EINVAL;
+
+	td = urbp->begin;
+	if (!td)
+		return -EINVAL;
+
+	status =  uhci_status_bits(td->status);
+	if (status & TD_CTRL_ACTIVE)
+		return -EINPROGRESS;
+
+	if (status)
+		return uhci_map_status(status, uhci_packetout(td->info));
+
+	urb->actual_length += uhci_actual_length(td->status);
+
+	return 0;
+}
+
+static void uhci_reset_interrupt(urb_t *urb)
+{
+	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+	struct uhci_td *td;
+
+	if (urb->interval) {
+		td = urbp->begin;
+
+		usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
+		td->status = (td->status & 0x2F000000) | TD_CTRL_ACTIVE | TD_CTRL_IOC;
+		td->info &= ~(1 << TD_TOKEN_TOGGLE);
+		td->info |= (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE);
+
+		urb->status = -EINPROGRESS;
+	} else
+		uhci_unlink_interrupt(urb);
+}
+
+/*
+ * Bulk transfers
+ */
+static int uhci_submit_bulk(urb_t *urb)
+{
+	struct uhci_td *td;
+	struct uhci_qh *qh;
+	unsigned long destination, status;
+	struct uhci_device *dev = usb_to_uhci(urb->dev);
+	struct uhci *uhci = dev->uhci;
+	int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+	int len = urb->transfer_buffer_length;
+	unsigned char *data = urb->transfer_buffer;
+	struct urb_priv *urbp;
+
+	if (len < 0)
+		return -EINVAL;
+
+	/* The "pipe" thing contains the destination in bits 8--18 */
+	destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+
+	/* 3 errors */
+	status = (urb->pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | (3 << 27);
+	if (!(urb->transfer_flags & USB_DISABLE_SPD))
+		status |= TD_CTRL_SPD;
+
+	urbp = kmalloc(sizeof(*urbp), in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+	if (!urbp)
+		return -ENOMEM;
+
+	urbp->begin = urbp->end = NULL;
+
+	urb->hcpriv = urbp;
+
+	/*
+	 * Build the DATA TD's
+	 */
+	while (len > 0) {
+		int pktsze = len;
+
+		if (pktsze > maxsze)
+			pktsze = maxsze;
+
+		td = uhci_td_alloc(dev);
+		if (!td) {
+			/* FIXME: Free the TD's */
+			return -ENOMEM;
+		}
+
+		uhci_add_td_to_urb(urb, td);
+		uhci_fill_td(td, status, destination | ((pktsze - 1) << 21) |
+			(usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+			 usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE),
+			virt_to_bus(data));
+
+		data += pktsze;
+		len -= maxsze;
+
+		if (len <= 0) {
+			td->status |= TD_CTRL_IOC;
+			uhci_add_irq_list(uhci, td);
+		}
+
+		usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+			usb_pipeout(urb->pipe));
+	}
+
+	qh = uhci_qh_alloc(dev);
+	if (!qh) {
+		/* FIXME: Free all of the TD's */
+		return -ENOMEM;
+	}
+	uhci_insert_tds_in_qh(qh, urbp->begin);
+
+	uhci_insert_qh(dev->uhci, &dev->uhci->skel_bulk_qh, qh);
+	urbp->qh = qh;
+
+	uhci_add_urb_list(uhci, urb);
+
+	usb_inc_dev_use(urb->dev);
+
+	return -EINPROGRESS;
+}
+
+/* We can use the control unlink since they're identical */
+#define uhci_unlink_bulk uhci_unlink_control
+
+static int uhci_result_bulk(urb_t *urb)
+{
+	struct urb_priv *urbp = urb->hcpriv;
+	struct uhci_td *td;
+	unsigned int status;
+
+	urb->actual_length = 0;
+
+	/* The rest of the TD's (but the last) are data */
+	for (td = urbp->begin; td; td = td->next) {
+		status = uhci_status_bits(td->status);
+		if (status & TD_CTRL_ACTIVE)
+			return -EINPROGRESS;
+
+		urb->actual_length += uhci_actual_length(td->status);
+
+		/* If SPD is set then we received a short packet */
+		if (td->status & TD_CTRL_SPD && (uhci_actual_length(td->status) < uhci_expected_length(td->info))) {
+			usb_settoggle(urb->dev, uhci_endpoint(td->info),
+				uhci_packetout(td->info),
+				uhci_toggle(td->info) ^ 1);
+
+			goto td_success;
+		}
+
+		if (status)
+			goto td_error;
+	}
+
+td_success:
+	uhci_unlink_bulk(urb);
+
+	return 0;
+
+td_error:
+	/* Some debugging code */
+	if (debug) {
+		dbg("uhci_result_bulk() failed with status %x",
+			status);
+
+		/* Print the chain for debugging purposes */
+		uhci_show_queue(urbp->qh);
+	}
+
+	if (status & TD_CTRL_STALLED) {
+		/* endpoint has stalled - mark it halted */
+		usb_endpoint_halt(urb->dev, uhci_endpoint(td->info),
+	    			uhci_packetout(td->info));
+		return -EPIPE;
+	}
+
+	return uhci_map_status(status, uhci_packetout(td->info));
+}
+
+/*
+ * Isochronous transfers
+ */
+static int isochronous_find_limits(urb_t *urb, unsigned int *start, unsigned int *end)
+{
+	urb_t *u, *last_urb = NULL;
+	struct uhci *uhci = (struct uhci *)urb->dev->bus->hcpriv;
+	struct list_head *tmp, *head = &uhci->urb_list;
+	unsigned long flags;
+
+	spin_lock_irqsave(&uhci->urblist_lock, flags);
+	tmp = head->next;
+	while (tmp != head) {
+		u = list_entry(tmp, urb_t, urb_list);
+
+		/* look for pending URB's with identical pipe handle */
+		if ((urb->pipe == u->pipe) && (urb->dev == u->dev) &&
+		    (u->status == -EINPROGRESS) && (u != urb)) {
+			if (!last_urb)
+				*start = u->start_frame;
+			last_urb = u;
+		}
+		tmp = tmp->next;
+	}
+	spin_unlock_irqrestore(&uhci->urblist_lock, flags);
+
+	if (last_urb) {
+		*end = (last_urb->start_frame + last_urb->number_of_packets) & 1023;
+		return 0;
+	} else
+		return -1;	// no previous urb found
+
+}
+
+static int isochronous_find_start(urb_t *urb)
+{
+	int limits;
+	unsigned int start = 0, end = 0;
+
+	if (urb->number_of_packets > 900)	/* 900? Why? */
+		return -EFBIG;
+
+	limits = isochronous_find_limits(urb, &start, &end);
+
+	if (urb->transfer_flags & USB_ISO_ASAP) {
+		if (limits) {
+			int curframe;
+
+			curframe = uhci_get_current_frame_number(urb->dev) % UHCI_NUMFRAMES;
+			urb->start_frame = (curframe + 10) % UHCI_NUMFRAMES;
+		} else
+			urb->start_frame = end;
+	} else {
+		urb->start_frame %= UHCI_NUMFRAMES;
+		/* FIXME: Sanity check */
+	}
+
+	return 0;
+}
+
+static int uhci_submit_isochronous(urb_t *urb)
+{
+	struct uhci_td *td;
+	struct uhci_device *dev = usb_to_uhci(urb->dev);
+	struct uhci *uhci = dev->uhci;
+	struct urb_priv *urbp;
+	int i, ret, framenum;
+	int status, destination;
+
+	status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
+	destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+
+	ret = isochronous_find_start(urb);
+	if (ret)
+		return ret;
+
+	urbp = kmalloc(sizeof(*urbp), in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+	if (!urbp)
+		return -ENOMEM;
+
+	urbp->begin = urbp->end = NULL;
+
+	urb->hcpriv = urbp;
+
+	framenum = urb->start_frame;
+	for (i = 0; i < urb->number_of_packets; i++, framenum++) {
+		if (!urb->iso_frame_desc[i].length)
+			continue;
+
+		td = uhci_td_alloc(dev);
+		if (!td) {
+			/* FIXME: Free the TD's */
+			return -ENOMEM;
+		}
+
+		uhci_add_td_to_urb(urb, td);
+		uhci_fill_td(td, status, destination | ((urb->iso_frame_desc[i].length - 1) << 21),
+			virt_to_bus(urb->transfer_buffer + urb->iso_frame_desc[i].offset));
+
+		if (i + 1 >= urb->number_of_packets) {
+			td->status |= TD_CTRL_IOC;
+			uhci_add_irq_list(uhci, td);
+		}
+
+		uhci_insert_td_frame_list(uhci, td, framenum);
+	}
+
+	uhci_add_urb_list(uhci, urb);
+
+	usb_inc_dev_use(urb->dev);
+
+	return -EINPROGRESS;
+}
+
+static int uhci_unlink_isochronous(urb_t *urb)
+{
+	struct urb_priv *urbp = urb->hcpriv;
+	struct uhci_td *td;
+	struct uhci_device *dev = usb_to_uhci(urb->dev);
+	struct uhci *uhci = dev->uhci;
+
+	if (!urbp)
+		return -EINVAL;
+
+	/* Go through the rest of the TD's, deleting them, then scheduling */
+	/*  their deletion */
+	td = urbp->begin;
+	while (td) {
+		struct uhci_td *next = td->next;
+
+		uhci_remove_td(uhci, td);
+
+		if (td->status & TD_CTRL_IOC)
+			uhci_remove_irq_list(uhci, td);
+		uhci_schedule_delete_td(uhci, td);
+
+		td = next;
+	}
+
+	kfree(urbp);
+	urb->hcpriv = NULL;
+
+	uhci_remove_urb_list(uhci, urb);
+
+	return 0;
+}
+
+static int uhci_result_isochronous(urb_t *urb)
+{
+	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+	struct uhci_td *td;
+	int status;
+	int i, ret = 0;
+
+	td = urbp->end;
+	if (!td)		/* Nothing to do */
+		return -EINVAL;
+
+	status =  uhci_status_bits(td->status);
+	if (status & TD_CTRL_ACTIVE)
+		return -EINPROGRESS;
+
+	/* Assume no errors, we'll overwrite this if not */
+	urb->status = 0;
+
+	urb->actual_length = 0;
+	for (i = 0, td = urbp->begin; td; i++, td = td->next) {
+		int actlength;
+
+		actlength = uhci_actual_length(td->status);
+		urb->iso_frame_desc[i].actual_length = actlength;
+		urb->actual_length += actlength;
+
+		status = uhci_map_status(uhci_status_bits(td->status), usb_pipeout(urb->pipe));
+		urb->iso_frame_desc[i].status = status;
+		if (status != 0) {
+			urb->error_count++;
+			ret = status;
+		}
+	}
+
+	uhci_unlink_isochronous(urb);
+
+	return status;
+}
+
+static int uhci_submit_urb(urb_t *urb)
+{
+	int ret = -EINVAL;
+	struct uhci *uhci;
+
+	if (!urb)
+		return -EINVAL;
+
+	if (!urb->dev || !urb->dev->bus)
+		return -ENODEV;
+
+	uhci = (struct uhci *)urb->dev->bus->hcpriv;
+
+	if (usb_pipedevice(urb->pipe) == uhci->rh.devnum)
+		return rh_submit_urb(urb);	/* Virtual root hub */
+
+	switch (usb_pipetype(urb->pipe)) {
+	case PIPE_CONTROL:
+		ret = uhci_submit_control(urb);
+		break;
+	case PIPE_INTERRUPT:
+		ret = uhci_submit_interrupt(urb);
+		break;
+	case PIPE_BULK:
+		ret = uhci_submit_bulk(urb);
+		break;
+	case PIPE_ISOCHRONOUS:
+		ret = uhci_submit_isochronous(urb);
+		break;
+	}
+
+	urb->status = ret;
+	if (ret == -EINPROGRESS) {
+		usb_inc_dev_use(urb->dev);
+
+		return 0;
+	}
+
+	return ret;
+}
+
+/*
+ * Return the result of a transfer
+ */
+static void uhci_transfer_result(urb_t *urb)
+{
+	urb_t *turb;
+	int proceed = 0, is_ring = 0;
+	int ret = -EINVAL;
+
+	switch (usb_pipetype(urb->pipe)) {
+	case PIPE_CONTROL:
+		ret = uhci_result_control(urb);
+		break;
+	case PIPE_INTERRUPT:
+		/* Interrupts are an exception */
+		urb->status = uhci_result_interrupt(urb);
+		if (urb->status != -EINPROGRESS) {
+			urb->complete(urb);
+			uhci_reset_interrupt(urb);
+		}
+		return;
+	case PIPE_BULK:
+		ret = uhci_result_bulk(urb);
+		break;
+	case PIPE_ISOCHRONOUS:
+		ret = uhci_result_isochronous(urb);
+		break;
+	}
+
+	urb->status = ret;
+	if (urb->status == -EINPROGRESS)
+		return;
+
+	if (urb->next) {
+		turb = urb->next;
+		do {
+			if (turb->status != -EINPROGRESS) {
+				proceed = 1;
+				break;
+			}
+
+			turb = turb->next;
+		} while (turb && turb != urb && turb != urb->next);
+
+		if (turb == urb || turb == urb->next)
+			is_ring = 1;
+	}
+
+	if (urb->complete && (!proceed || (urb->transfer_flags & USB_URB_EARLY_COMPLETE))) {
+		urb->complete(urb);
+		if (!proceed && is_ring)
+			uhci_submit_urb(urb);
+	}
+
+	if (proceed && urb->next) {
+		turb = urb->next;
+		do {
+			if (turb->status != -EINPROGRESS &&
+			    uhci_submit_urb(turb) != 0)
+
+			turb = turb->next;
+		} while (turb && turb != urb->next);
+
+		if (urb->complete && !(urb->transfer_flags & USB_URB_EARLY_COMPLETE))
+			urb->complete(urb);
+	}
+
+	usb_dec_dev_use(urb->dev);
+}
+
+static int uhci_unlink_urb(urb_t *urb)
+{
+	struct uhci *uhci;
+	int ret = 0;
+
+	if (!urb)
+		return -EINVAL;
+
+	uhci = (struct uhci *)urb->dev->bus->hcpriv;
+
+	if (usb_pipedevice(urb->pipe) == uhci->rh.devnum)
+		return rh_unlink_urb(urb);
+
+	if (urb->status == -EINPROGRESS) {
+		switch (usb_pipetype(urb->pipe)) {
+		case PIPE_CONTROL:
+			ret = uhci_unlink_control(urb);
+			break;
+		case PIPE_INTERRUPT:
+			ret = uhci_unlink_interrupt(urb);
+			break;
+		case PIPE_BULK:
+			ret = uhci_unlink_bulk(urb);
+			break;
+		case PIPE_ISOCHRONOUS:
+			ret = uhci_unlink_isochronous(urb);
+			break;
+		}
+
+		if (urb->complete)
+			urb->complete(urb);
+
+		if (in_interrupt()) {		/* wait at least 1 frame */
+			int errorcount = 10;
+
+			if (errorcount--)
+				dbg("uhci_unlink_urb called from interrupt for urb %p", urb);
+			udelay(1000);
+		} else
+			schedule_timeout(1+1*HZ/1000); 
+
+		usb_dec_dev_use(urb->dev);
+	}
+
+	urb->status = -ENOENT;
+
+	return ret;
+}
+
+/*
+ * uhci_get_current_frame_number()
+ *
+ * returns the current frame number for a USB bus/controller.
+ */
+static int uhci_get_current_frame_number(struct usb_device *usb_dev)
+{
+	struct uhci_device *dev = (struct uhci_device *)usb_dev->hcpriv;
+
+	return inw(dev->uhci->io_addr + USBFRNUM);
+}
+
+struct usb_operations uhci_device_operations = {
+	uhci_alloc_dev,
+	uhci_free_dev,
+	uhci_get_current_frame_number,
+	uhci_submit_urb,
+	uhci_unlink_urb
+};
+
+/* -------------------------------------------------------------------
+   Virtual Root Hub
+   ------------------------------------------------------------------- */
+
+static __u8 root_hub_dev_des[] =
+{
+ 	0x12,			/*  __u8  bLength; */
+	0x01,			/*  __u8  bDescriptorType; Device */
+	0x00,			/*  __u16 bcdUSB; v1.0 */
+	0x01,
+	0x09,			/*  __u8  bDeviceClass; HUB_CLASSCODE */
+	0x00,			/*  __u8  bDeviceSubClass; */
+	0x00,			/*  __u8  bDeviceProtocol; */
+	0x08,			/*  __u8  bMaxPacketSize0; 8 Bytes */
+	0x00,			/*  __u16 idVendor; */
+	0x00,
+	0x00,			/*  __u16 idProduct; */
+	0x00,
+	0x00,			/*  __u16 bcdDevice; */
+	0x00,
+	0x00,			/*  __u8  iManufacturer; */
+	0x00,			/*  __u8  iProduct; */
+	0x00,			/*  __u8  iSerialNumber; */
+	0x01			/*  __u8  bNumConfigurations; */
+};
+
+
+/* Configuration descriptor */
+static __u8 root_hub_config_des[] =
+{
+	0x09,			/*  __u8  bLength; */
+	0x02,			/*  __u8  bDescriptorType; Configuration */
+	0x19,			/*  __u16 wTotalLength; */
+	0x00,
+	0x01,			/*  __u8  bNumInterfaces; */
+	0x01,			/*  __u8  bConfigurationValue; */
+	0x00,			/*  __u8  iConfiguration; */
+	0x40,			/*  __u8  bmAttributes;
+					Bit 7: Bus-powered, 6: Self-powered,
+					Bit 5 Remote-wakeup, 4..0: resvd */
+	0x00,			/*  __u8  MaxPower; */
+
+	/* interface */
+	0x09,			/*  __u8  if_bLength; */
+	0x04,			/*  __u8  if_bDescriptorType; Interface */
+	0x00,			/*  __u8  if_bInterfaceNumber; */
+	0x00,			/*  __u8  if_bAlternateSetting; */
+	0x01,			/*  __u8  if_bNumEndpoints; */
+	0x09,			/*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
+	0x00,			/*  __u8  if_bInterfaceSubClass; */
+	0x00,			/*  __u8  if_bInterfaceProtocol; */
+	0x00,			/*  __u8  if_iInterface; */
+
+	/* endpoint */
+	0x07,			/*  __u8  ep_bLength; */
+	0x05,			/*  __u8  ep_bDescriptorType; Endpoint */
+	0x81,			/*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
+	0x03,			/*  __u8  ep_bmAttributes; Interrupt */
+	0x08,			/*  __u16 ep_wMaxPacketSize; 8 Bytes */
+	0x00,
+	0xff			/*  __u8  ep_bInterval; 255 ms */
+};
+
+static __u8 root_hub_hub_des[] =
+{
+	0x09,			/*  __u8  bLength; */
+	0x29,			/*  __u8  bDescriptorType; Hub-descriptor */
+	0x02,			/*  __u8  bNbrPorts; */
+	0x00,			/* __u16  wHubCharacteristics; */
+	0x00,
+	0x01,			/*  __u8  bPwrOn2pwrGood; 2ms */
+	0x00,			/*  __u8  bHubContrCurrent; 0 mA */
+	0x00,			/*  __u8  DeviceRemovable; *** 7 Ports max *** */
+	0xff			/*  __u8  PortPwrCtrlMask; *** 7 ports max *** */
+};
+
+/*-------------------------------------------------------------------------*/
+/* prepare Interrupt pipe transaction data; HUB INTERRUPT ENDPOINT */
+static int rh_send_irq(urb_t *urb)
+{
+	int i, len = 1;
+	struct uhci *uhci = (struct uhci *)urb->dev->bus->hcpriv;
+	unsigned int io_addr = uhci->io_addr;
+	__u16 data = 0;
+
+	for (i = 0; i < uhci->rh.numports; i++) {
+		data |= ((inw(io_addr + USBPORTSC1 + i * 2) & 0xa) > 0 ? (1 << (i + 1)) : 0);
+		len = (i + 1) / 8 + 1;
+	}
+
+	*(__u16 *) urb->transfer_buffer = cpu_to_le16(data);
+	urb->actual_length = len;
+	urb->status = USB_ST_NOERROR;
+
+	if ((data > 0) && (uhci->rh.send != 0)) {
+#ifdef DEBUG /* JE */
+static int foo=5;
+if (foo--)
+#endif
+		dbg("root-hub INT complete: port1: %x port2: %x data: %x",
+			inw(io_addr + USBPORTSC1), inw(io_addr + USBPORTSC2), data);
+		urb->complete(urb);
+	}
+
+	return USB_ST_NOERROR;
+}
+
+/*-------------------------------------------------------------------------*/
+/* Virtual Root Hub INTs are polled by this timer every "interval" ms */
+static int rh_init_int_timer(urb_t *urb);
+
+static void rh_int_timer_do(unsigned long ptr)
+{
+	int len;
+	urb_t *urb = (urb_t *)ptr;
+	struct uhci *uhci = (struct uhci *)urb->dev->bus->hcpriv;
+
+	if (uhci->rh.send) {
+		len = rh_send_irq(urb);
+		if (len > 0) {
+			urb->actual_length = len;
+			if (urb->complete)
+				urb->complete(urb);
+		}
+	}
+
+	rh_init_int_timer(urb);
+}
+
+/*-------------------------------------------------------------------------*/
+/* Root Hub INTs are polled by this timer */
+static int rh_init_int_timer(urb_t *urb)
+{
+	struct uhci *uhci = (struct uhci *)urb->dev->bus->hcpriv;
+
+	uhci->rh.interval = urb->interval;
+	init_timer(&uhci->rh.rh_int_timer);
+	uhci->rh.rh_int_timer.function = rh_int_timer_do;
+	uhci->rh.rh_int_timer.data = (unsigned long)urb;
+	uhci->rh.rh_int_timer.expires = jiffies + (HZ * (urb->interval < 30 ? 30 : urb->interval)) / 1000;
+	add_timer(&uhci->rh.rh_int_timer);
+
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+#define OK(x)			len = (x); break
+
+#define CLR_RH_PORTSTAT(x) \
+	status = inw(io_addr + USBPORTSC1 + 2 * (wIndex-1)); \
+	status = (status & 0xfff5) & ~(x); \
+	outw(status, io_addr + USBPORTSC1 + 2 * (wIndex-1))
+
+#define SET_RH_PORTSTAT(x) \
+	status = inw(io_addr + USBPORTSC1 + 2 * (wIndex-1)); \
+	status = (status & 0xfff5) | (x); \
+	outw(status, io_addr + USBPORTSC1 + 2 * (wIndex-1))
+
+
+/*-------------------------------------------------------------------------*/
+/*************************
+ ** Root Hub Control Pipe
+ *************************/
+
+static int rh_submit_urb(urb_t *urb)
+{
+	struct usb_device *usb_dev = urb->dev;
+	struct uhci *uhci = (struct uhci *)usb_dev->bus->hcpriv;
+	unsigned int pipe = urb->pipe;
+	devrequest *cmd = (devrequest *)urb->setup_packet;
+	void *data = urb->transfer_buffer;
+	int leni = urb->transfer_buffer_length;
+	int len = 0;
+	int status = 0;
+	int stat = USB_ST_NOERROR;
+	int i;
+	unsigned int io_addr = uhci->io_addr;
+	__u16 cstatus;
+	__u16 bmRType_bReq;
+	__u16 wValue;
+	__u16 wIndex;
+	__u16 wLength;
+
+	if (usb_pipetype(pipe) == PIPE_INTERRUPT) {
+		uhci->rh.urb = urb;
+		uhci->rh.send = 1;
+		uhci->rh.interval = urb->interval;
+		rh_init_int_timer(urb);
+
+		return USB_ST_NOERROR;
+	}
+
+	bmRType_bReq = cmd->requesttype | cmd->request << 8;
+	wValue = le16_to_cpu(cmd->value);
+	wIndex = le16_to_cpu(cmd->index);
+	wLength = le16_to_cpu(cmd->length);
+
+	for (i = 0; i < 8; i++)
+		uhci->rh.c_p_r[i] = 0;
+
+	switch (bmRType_bReq) {
+		/* Request Destination:
+		   without flags: Device,
+		   RH_INTERFACE: interface,
+		   RH_ENDPOINT: endpoint,
+		   RH_CLASS means HUB here,
+		   RH_OTHER | RH_CLASS  almost ever means HUB_PORT here
+		*/
+
+	case RH_GET_STATUS:
+		*(__u16 *)data = cpu_to_le16(1);
+		OK(2);
+	case RH_GET_STATUS | RH_INTERFACE:
+		*(__u16 *)data = cpu_to_le16(0);
+		OK(2);
+	case RH_GET_STATUS | RH_ENDPOINT:
+		*(__u16 *)data = cpu_to_le16(0);
+		OK(2);
+	case RH_GET_STATUS | RH_CLASS:
+		*(__u32 *)data = cpu_to_le32(0);
+		OK(4);		/* hub power */
+	case RH_GET_STATUS | RH_OTHER | RH_CLASS:
+		status = inw(io_addr + USBPORTSC1 + 2 * (wIndex - 1));
+		cstatus = ((status & USBPORTSC_CSC) >> (1 - 0)) |
+			((status & USBPORTSC_PEC) >> (3 - 1)) |
+			(uhci->rh.c_p_r[wIndex - 1] << (0 + 4));
+			status = (status & USBPORTSC_CCS) |
+			((status & USBPORTSC_PE) >> (2 - 1)) |
+			((status & USBPORTSC_SUSP) >> (12 - 2)) |
+			((status & USBPORTSC_PR) >> (9 - 4)) |
+			(1 << 8) |      /* power on */
+			((status & USBPORTSC_LSDA) << (-8 + 9));
+
+		*(__u16 *)data = cpu_to_le16(status);
+		*(__u16 *)(data + 2) = cpu_to_le16(cstatus);
+		OK(4);
+	case RH_CLEAR_FEATURE | RH_ENDPOINT:
+		switch (wValue) {
+		case RH_ENDPOINT_STALL:
+			OK(0);
+		}
+		break;
+	case RH_CLEAR_FEATURE | RH_CLASS:
+		switch (wValue) {
+		case RH_C_HUB_OVER_CURRENT:
+			OK(0);	/* hub power over current */
+		}
+		break;
+	case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
+		switch (wValue) {
+		case RH_PORT_ENABLE:
+			CLR_RH_PORTSTAT(USBPORTSC_PE);
+			OK(0);
+		case RH_PORT_SUSPEND:
+			CLR_RH_PORTSTAT(USBPORTSC_SUSP);
+			OK(0);
+		case RH_PORT_POWER:
+			OK(0);	/* port power */
+		case RH_C_PORT_CONNECTION:
+			SET_RH_PORTSTAT(USBPORTSC_CSC);
+			OK(0);
+		case RH_C_PORT_ENABLE:
+			SET_RH_PORTSTAT(USBPORTSC_PEC);
+			OK(0);
+		case RH_C_PORT_SUSPEND:
+			/*** WR_RH_PORTSTAT(RH_PS_PSSC); */
+			OK(0);
+		case RH_C_PORT_OVER_CURRENT:
+			OK(0);	/* port power over current */
+		case RH_C_PORT_RESET:
+			uhci->rh.c_p_r[wIndex - 1] = 0;
+			OK(0);
+		}
+		break;
+	case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
+		switch (wValue) {
+		case RH_PORT_SUSPEND:
+			SET_RH_PORTSTAT(USBPORTSC_SUSP);
+			OK(0);
+		case RH_PORT_RESET:
+			SET_RH_PORTSTAT(USBPORTSC_PR);
+			wait_ms(10);
+			uhci->rh.c_p_r[wIndex - 1] = 1;
+			CLR_RH_PORTSTAT(USBPORTSC_PR);
+			udelay(10);
+			SET_RH_PORTSTAT(USBPORTSC_PE);
+			wait_ms(10);
+			SET_RH_PORTSTAT(0xa);
+			OK(0);
+		case RH_PORT_POWER:
+			OK(0); /* port power ** */
+		case RH_PORT_ENABLE:
+			SET_RH_PORTSTAT (USBPORTSC_PE);
+			OK(0);
+		}
+		break;
+	case RH_SET_ADDRESS:
+		uhci->rh.devnum = wValue;
+		OK(0);
+	case RH_GET_DESCRIPTOR:
+		switch ((wValue & 0xff00) >> 8) {
+		case 0x01:	/* device descriptor */
+			len = min(leni, min(sizeof(root_hub_dev_des), wLength));
+			memcpy(data, root_hub_dev_des, len);
+			OK(len);
+		case 0x02:	/* configuration descriptor */
+			len = min(leni, min(sizeof(root_hub_config_des), wLength));
+			memcpy (data, root_hub_config_des, len);
+			OK(len);
+		case 0x03:	/* string descriptors */
+			stat = -EPIPE;
+		}
+		break;
+	case RH_GET_DESCRIPTOR | RH_CLASS:
+		root_hub_hub_des[2] = uhci->rh.numports;
+		len = min(leni, min(sizeof(root_hub_hub_des), wLength));
+		memcpy(data, root_hub_hub_des, len);
+		OK(len);
+	case RH_GET_CONFIGURATION:
+		*(__u8 *)data = 0x01;
+		OK(1);
+	case RH_SET_CONFIGURATION:
+		OK(0);
+	default:
+		stat = -EPIPE;
+	}
+
+	urb->actual_length = len;
+	urb->status = stat;
+	if (urb->complete)
+		urb->complete(urb);
+
+	return USB_ST_NOERROR;
+}
+/*-------------------------------------------------------------------------*/
+
+static int rh_unlink_urb(urb_t *urb)
+{
+	struct uhci *uhci = (struct uhci *)urb->dev->bus->hcpriv;
+
+	uhci->rh.send = 0;
+	del_timer(&uhci->rh.rh_int_timer);
+
+	return 0;
+}
+/*-------------------------------------------------------------------*/
+
+/*
+ * This is just incredibly fragile. The timings must be just
+ * right, and they aren't really documented very well.
+ *
+ * Note the short delay between disabling reset and enabling
+ * the port..
+ */
+static void uhci_reset_port(unsigned int port)
+{
+	unsigned short status;
+
+	status = inw(port);
+	outw(status | USBPORTSC_PR, port);		/* reset port */
+	wait_ms(10);
+	outw(status & ~USBPORTSC_PR, port);
+	udelay(50);
+
+	status = inw(port);
+	outw(status | USBPORTSC_PE, port);		/* enable port */
+	wait_ms(10);
+
+	status = inw(port);
+	if (!(status & USBPORTSC_PE)) {
+		outw(status | USBPORTSC_PE, port);	/* one more try at enabling port */
+		wait_ms(50);
+	}
+
+}
+
+void uhci_free_pending(struct uhci *uhci)
+{
+	struct list_head *tmp, *head;
+
+	/* Free all of the pending QH's and TD's */
+	head = &uhci->td_free_list;
+	tmp = head->next;
+	while (tmp != head) {
+		struct uhci_td *td = list_entry(tmp, struct uhci_td, list);
+
+		tmp = tmp->next;
+
+                list_del(&td->list);
+                INIT_LIST_HEAD(&td->list);
+
+		uhci_td_free(td);
+	}
+
+	head = &uhci->qh_free_list;
+	tmp = head->next;
+	while (tmp != head) {
+		struct uhci_qh *qh = list_entry(tmp, struct uhci_qh, list);
+
+		tmp = tmp->next;
+
+                list_del(&qh->list);
+                INIT_LIST_HEAD(&qh->list);
+
+		uhci_qh_free(qh);
+	}
+}
+
+static void uhci_interrupt(int irq, void *__uhci, struct pt_regs *regs)
+{
+	struct uhci *uhci = __uhci;
+	unsigned int io_addr = uhci->io_addr;
+	unsigned short status;
+	unsigned long flags;
+	struct list_head *tmp, *head;
+	urb_t *urb;
+
+	/*
+	 * Read the interrupt status, and write it back to clear the
+	 * interrupt cause
+	 */
+	status = inw(io_addr + USBSTS);
+	if (!status)	/* shared interrupt, not mine */
+		return;
+	outw(status, io_addr + USBSTS);
+
+	if (status & ~(USBSTS_USBINT | USBSTS_ERROR)) {
+		if (status & USBSTS_RD)
+			printk(KERN_INFO "uhci: resume detected, not implemented\n");
+		if (status & USBSTS_HSE)
+			printk(KERN_ERR "uhci: host system error, PCI problems?\n");
+		if (status & USBSTS_HCPE)
+			printk(KERN_ERR "uhci: host controller process error. something bad happened\n");
+		if (status & USBSTS_HCH) {
+			printk(KERN_ERR "uhci: host controller halted. very bad\n");
+			/* FIXME: Reset the controller, fix the offending TD */
+		}
+	}
+
+	/* Free all of the pending QH's and TD's */
+	spin_lock(&uhci->freelist_lock);
+	uhci_free_pending(uhci);
+	spin_unlock(&uhci->freelist_lock);
+
+	/* Walk the list of pending TD's to see which ones completed.. */
+	nested_lock(&uhci->irqlist_lock, flags);
+	head = &uhci->interrupt_list;
+	tmp = head->next;
+	while (tmp != head) {
+		struct uhci_td *td = list_entry(tmp, struct uhci_td, irq_list);
+
+		urb = td->urb;
+
+		tmp = tmp->next;
+
+		/* Checks the status and does all of the magic necessary */
+		uhci_transfer_result(urb);
+	}
+	nested_unlock(&uhci->irqlist_lock, flags);
+}
+
+static void reset_hc(struct uhci *uhci)
+{
+	unsigned int io_addr = uhci->io_addr;
+
+	/* Global reset for 50ms */
+	outw(USBCMD_GRESET, io_addr + USBCMD);
+	wait_ms(50);
+	outw(0, io_addr + USBCMD);
+	wait_ms(10);
+}
+
+static void start_hc(struct uhci *uhci)
+{
+	unsigned int io_addr = uhci->io_addr;
+	int timeout = 1000;
+
+	/*
+	 * Reset the HC - this will force us to get a
+	 * new notification of any already connected
+	 * ports due to the virtual disconnect that it
+	 * implies.
+	 */
+	outw(USBCMD_HCRESET, io_addr + USBCMD);
+	while (inw(io_addr + USBCMD) & USBCMD_HCRESET) {
+		if (!--timeout) {
+			printk(KERN_ERR "uhci: USBCMD_HCRESET timed out!\n");
+			break;
+		}
+	}
+
+	/* Turn on all interrupts */
+	outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP,
+		io_addr + USBINTR);
+
+	/* Start at frame 0 */
+	outw(0, io_addr + USBFRNUM);
+	outl(virt_to_bus(uhci->fl), io_addr + USBFLBASEADD);
+
+	/* Run and mark it configured with a 64-byte max packet */
+	outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, io_addr + USBCMD);
+}
+
+/*
+ * Allocate a frame list, and then setup the skeleton
+ *
+ * The hardware doesn't really know any difference
+ * in the queues, but the order does matter for the
+ * protocols higher up. The order is:
+ *
+ *  - any isochronous events handled before any
+ *    of the queues. We don't do that here, because
+ *    we'll create the actual TD entries on demand.
+ *  - The first queue is the "interrupt queue".
+ *  - The second queue is the "control queue".
+ *  - The third queue is "bulk data".
+ */
+static struct uhci *alloc_uhci(unsigned int io_addr, unsigned int io_size)
+{
+	int i, port;
+	struct uhci *uhci;
+	struct usb_bus *bus;
+
+	uhci = kmalloc(sizeof(*uhci), GFP_KERNEL);
+	if (!uhci)
+		return NULL;
+
+	memset(uhci, 0, sizeof(*uhci));
+
+	uhci->irq = -1;
+	uhci->io_addr = io_addr;
+	uhci->io_size = io_size;
+
+	INIT_LIST_HEAD(&uhci->interrupt_list);
+	INIT_LIST_HEAD(&uhci->urb_list);
+	INIT_LIST_HEAD(&uhci->td_free_list);
+	INIT_LIST_HEAD(&uhci->qh_free_list);
+
+	spin_lock_init(&uhci->urblist_lock);
+	spin_lock_init(&uhci->framelist_lock);
+	spin_lock_init(&uhci->freelist_lock);
+	nested_init(&uhci->irqlist_lock);
+
+	/* We need exactly one page (per UHCI specs), how convenient */
+	/* We assume that one page is atleast 4k (1024 frames * 4 bytes) */
+	uhci->fl = (void *)__get_free_page(GFP_KERNEL);
+	if (!uhci->fl)
+		goto au_free_uhci;
+
+	bus = usb_alloc_bus(&uhci_device_operations);
+	if (!bus)
+		goto au_free_fl;
+
+	uhci->bus = bus;
+	bus->hcpriv = uhci;
+
+	/* Initialize the root hub */
+
+	/* UHCI specs says devices must have 2 ports, but goes on to say */
+	/*  they may have more but give no way to determine how many they */
+	/*  have. However, according to the UHCI spec, Bit 7 is always set */
+	/*  to 1. So we try to use this to our advantage */
+	for (port = 0; port < (io_size - 0x10) / 2; port++) {
+		unsigned int portstatus;
+
+		portstatus = inw(io_addr + 0x10 + (port * 2));
+		if (!(portstatus & 0x0080))
+			break;
+	}
+	if (debug)
+		info("detected %d ports", port);
+
+	/* This is experimental so anything less than 2 or greater than 8 is */
+	/*  something weird and we'll ignore it */
+	if (port < 2 || port > 8) {
+		info("port count misdetected? forcing to 2 ports");
+		port = 2;
+	}
+
+	uhci->rh.numports = port;
+
+	/*
+	 * 9 Interrupt queues; link int2 to int1, int4 to int2, etc
+	 * then link int1 to control and control to bulk
+	 */
+	for (i = 1; i < 9; i++) {
+		struct uhci_td *td = &uhci->skeltd[i];
+
+		uhci_fill_td(td, 0, (UHCI_NULL_DATA_SIZE << 21) | (0x7f << 8) | USB_PID_IN, 0);
+		td->link = virt_to_bus(&uhci->skeltd[i - 1]);
+	}
+
+
+	uhci_fill_td(&uhci->skel_int1_td, 0, (UHCI_NULL_DATA_SIZE << 21) | (0x7f << 8) | USB_PID_IN, 0);
+	uhci->skel_int1_td.link = virt_to_bus(&uhci->skel_control_qh) | UHCI_PTR_QH;
+
+	uhci->skel_control_qh.link = virt_to_bus(&uhci->skel_bulk_qh) | UHCI_PTR_QH;
+	uhci->skel_control_qh.element = UHCI_PTR_TERM;
+
+	uhci->skel_bulk_qh.link = UHCI_PTR_TERM;
+	uhci->skel_bulk_qh.element = UHCI_PTR_TERM;
+
+	/*
+	 * Fill the frame list: make all entries point to
+	 * the proper interrupt queue.
+	 *
+	 * This is probably silly, but it's a simple way to
+	 * scatter the interrupt queues in a way that gives
+	 * us a reasonable dynamic range for irq latencies.
+	 */
+	for (i = 0; i < 1024; i++) {
+		struct uhci_td *irq = &uhci->skel_int2_td;
+
+		if (i & 1) {
+			irq++;
+			if (i & 2) {
+				irq++;
+				if (i & 4) { 
+					irq++;
+					if (i & 8) { 
+						irq++;
+						if (i & 16) {
+							irq++;
+							if (i & 32) {
+								irq++;
+								if (i & 64)
+									irq++;
+							}
+						}
+					}
+				}
+			}
+		}
+
+		/* Only place we don't use the frame list routines */
+		uhci->fl->frame[i] =  virt_to_bus(irq);
+	}
+
+	return uhci;
+
+/*
+ * error exits:
+ */
+au_free_fl:
+	free_page((unsigned long)uhci->fl);
+au_free_uhci:
+	kfree(uhci);
+
+	return NULL;
+}
+
+/*
+ * De-allocate all resources..
+ */
+static void release_uhci(struct uhci *uhci)
+{
+	if (uhci->irq >= 0) {
+		free_irq(uhci->irq, uhci);
+		uhci->irq = -1;
+	}
+
+	if (uhci->fl) {
+		free_page((unsigned long)uhci->fl);
+		uhci->fl = NULL;
+	}
+
+	usb_free_bus(uhci->bus);
+	kfree(uhci);
+}
+
+int uhci_start_root_hub(struct uhci *uhci)
+{
+	struct usb_device *usb_dev;
+
+	usb_dev = usb_alloc_dev(NULL, uhci->bus);
+	if (!usb_dev)
+		return -1;
+
+	usb_to_uhci(usb_dev)->uhci = uhci;
+
+	uhci->bus->root_hub = usb_dev;
+	usb_connect(usb_dev);
+
+	if (usb_new_device(usb_dev) != 0) {
+		usb_free_dev(usb_dev);
+
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * If we've successfully found a UHCI, now is the time to increment the
+ * module usage count, and return success..
+ */
+static int setup_uhci(int irq, unsigned int io_addr, unsigned int io_size)
+{
+	int retval;
+	struct uhci *uhci;
+
+	uhci = alloc_uhci(io_addr, io_size);
+	if (!uhci)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&uhci->uhci_list);
+	list_add(&uhci->uhci_list, &uhci_list);
+
+	request_region(uhci->io_addr, io_size, "usb-uhci");
+
+	reset_hc(uhci);
+
+	usb_register_bus(uhci->bus);
+	start_hc(uhci);
+
+	retval = -EBUSY;
+	if (request_irq(irq, uhci_interrupt, SA_SHIRQ, "usb-uhci", uhci) == 0) {
+		uhci->irq = irq;
+
+		if (!uhci_start_root_hub(uhci))
+			return 0;
+	}
+
+	/* Couldn't allocate IRQ if we got here */
+	list_del(&uhci->uhci_list);
+	INIT_LIST_HEAD(&uhci->uhci_list);
+
+	reset_hc(uhci);
+	release_region(uhci->io_addr, uhci->io_size);
+	release_uhci(uhci);
+
+	return retval;
+}
+
+static int found_uhci(struct pci_dev *dev)
+{
+	int i;
+
+	/* Search for the IO base address.. */
+	for (i = 0; i < 6; i++) {
+		unsigned int io_addr = dev->resource[i].start;
+		unsigned int io_size =
+			dev->resource[i].end - dev->resource[i].start + 1;
+
+		/* IO address? */
+		if (!(dev->resource[i].flags & 1))
+			continue;
+
+		/* Is it already in use? */
+		if (check_region(io_addr, io_size))
+			break;
+
+		/* disable legacy emulation */
+		pci_write_config_word(dev, USBLEGSUP, USBLEGSUP_DEFAULT);
+
+		pci_enable_device(dev);
+
+		if (!dev->irq) {
+			err("found UHCI device with no IRQ assigned. check BIOS settings!");
+			continue;
+		}
+
+		return setup_uhci(dev->irq, io_addr, io_size);
+	}
+
+	return -1;
+}
+
+#ifdef CONFIG_APM
+static int handle_apm_event(apm_event_t event)
+{
+	static int down = 0;
+
+	switch (event) {
+	case APM_SYS_SUSPEND:
+	case APM_USER_SUSPEND:
+		if (down) {
+			dbg("received extra suspend event");
+			break;
+		}
+		down = 1;
+		break;
+	case APM_NORMAL_RESUME:
+	case APM_CRITICAL_RESUME:
+		if (!down) {
+			dbg("received bogus resume event");
+			break;
+		}
+		down = 0;
+		break;
+	}
+	return 0;
+}
+#endif
+
+int uhci_init(void)
+{
+	int retval;
+	struct pci_dev *dev;
+	u8 type;
+
+	retval = -ENOMEM;
+
+	/* We throw all of the TD's and QH's into a kmem cache */
+	/* TD's and QH's need to be 16 byte aligned and SLAB_HWCACHE_ALIGN */
+	/*  does this for us */
+	uhci_td_cachep = kmem_cache_create("uhci_td",
+		sizeof(struct uhci_td), 0,
+		SLAB_HWCACHE_ALIGN, NULL, NULL);
+
+	if (!uhci_td_cachep)
+		goto td_failed;
+
+	uhci_qh_cachep = kmem_cache_create("uhci_qh",
+		sizeof(struct uhci_qh), 0,
+		SLAB_HWCACHE_ALIGN, NULL, NULL);
+
+	if (!uhci_qh_cachep)
+		goto qh_failed;
+
+	retval = -ENODEV;
+	dev = NULL;
+	for (;;) {
+		dev = pci_find_class(PCI_CLASS_SERIAL_USB << 8, dev);
+		if (!dev)
+			break;
+
+		/* Is it the UHCI programming interface? */
+		pci_read_config_byte(dev, PCI_CLASS_PROG, &type);
+		if (type != 0)
+			continue;
+
+		/* Ok set it up */
+		retval = found_uhci(dev);
+	}
+
+	/* We only want to return an error code if ther was an error */
+	/*  and we didn't find a UHCI controller */
+	if (retval && uhci_list.next == &uhci_list)
+		goto init_failed;
+
+#ifdef CONFIG_APM
+	apm_register_callback(&handle_apm_event);
+#endif
+
+	return 0;
+
+init_failed:
+	if (kmem_cache_destroy(uhci_qh_cachep))
+		printk(KERN_INFO "uhci: not all QH's were freed\n");
+
+qh_failed:
+	if (kmem_cache_destroy(uhci_td_cachep))
+		printk(KERN_INFO "uhci: not all TD's were freed\n");
+
+td_failed:
+	return retval;
+}
+
+void uhci_cleanup(void)
+{
+	struct list_head *next, *tmp, *head = &uhci_list;
+	int i;
+	unsigned long flags;
+
+	tmp = head->next;
+	while (tmp != head) {
+		struct uhci *uhci = list_entry(tmp, struct uhci, uhci_list);
+
+		next = tmp->next;
+
+		list_del(&uhci->uhci_list);
+		INIT_LIST_HEAD(&uhci->uhci_list);
+
+		if (uhci->bus->root_hub)
+			usb_disconnect(&uhci->bus->root_hub);
+
+		usb_deregister_bus(uhci->bus);
+
+		reset_hc(uhci);
+		release_region(uhci->io_addr, uhci->io_size);
+
+		/* Free any outstanding TD's and QH's */
+		spin_lock_irqsave(&uhci->freelist_lock, flags);
+		uhci_free_pending(uhci);
+		spin_unlock_irqrestore(&uhci->freelist_lock, flags);
+
+		release_uhci(uhci);
+
+		tmp = next;
+	}
+
+	if (kmem_cache_destroy(uhci_qh_cachep))
+		printk(KERN_INFO "uhci: not all QH's were freed\n");
+
+	if (kmem_cache_destroy(uhci_td_cachep))
+		printk(KERN_INFO "uhci: not all TD's were freed\n");
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	return uhci_init();
+}
+
+void cleanup_module(void)
+{
+#ifdef CONFIG_APM
+	apm_unregister_callback(&handle_apm_event);
+#endif
+	uhci_cleanup();
+}
+#endif //MODULE
+