uhci-hcd.c 63.2 KB
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/*
 * Universal Host Controller Interface driver for USB.
 *
 * Maintainer: Johannes Erdfelt <johannes@erdfelt.com>
 *
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.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
 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
 *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
 *
 * 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/init.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/proc_fs.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#include <linux/usb.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>

#include "../core/hcd.h"
#include "uhci-hcd.h"

#include <linux/pm.h>

/*
 * Version Information
 */
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#define DRIVER_VERSION "v2.1"
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#define DRIVER_AUTHOR "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, Roman Weissgaerber"
#define DRIVER_DESC "USB Universal Host Controller Interface driver"

/*
 * debug = 0, no debugging messages
 * debug = 1, dump failed URB's except for stalls
 * debug = 2, dump all failed URB's (including stalls)
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 *            show all queues in /proc/driver/uhci/[pci_addr]
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 * debug = 3, show all TD's in URB's when dumping
 */
#ifdef DEBUG
static int debug = 1;
#else
static int debug = 0;
#endif
MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug level");
static char *errbuf;
#define ERRBUF_LEN    (PAGE_SIZE * 8)

#include "uhci-hub.c"
#include "uhci-debug.c"

static kmem_cache_t *uhci_up_cachep;	/* urb_priv */

static int uhci_get_current_frame_number(struct uhci_hcd *uhci);
static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb);
static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb);

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static void hc_state_transitions(struct uhci_hcd *uhci);
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/* If a transfer is still active after this much time, turn off FSBR */
#define IDLE_TIMEOUT	(HZ / 20)	/* 50 ms */
#define FSBR_DELAY	(HZ / 20)	/* 50 ms */

/* When we timeout an idle transfer for FSBR, we'll switch it over to */
/* depth first traversal. We'll do it in groups of this number of TD's */
/* to make sure it doesn't hog all of the bandwidth */
#define DEPTH_INTERVAL 5

/*
 * Technically, updating td->status here is a race, but it's not really a
 * problem. The worst that can happen is that we set the IOC bit again
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 * generating a spurious interrupt. We could fix this by creating another
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 * QH and leaving the IOC bit always set, but then we would have to play
 * games with the FSBR code to make sure we get the correct order in all
 * the cases. I don't think it's worth the effort
 */
static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
{
	unsigned long flags;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);
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	uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC); 
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	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
{
	unsigned long flags;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);
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	uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
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	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

static inline void uhci_add_complete(struct uhci_hcd *uhci, struct urb *urb)
{
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	unsigned long flags;

	spin_lock_irqsave(&uhci->complete_list_lock, flags);
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	list_add_tail(&urbp->complete_list, &uhci->complete_list);
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	spin_unlock_irqrestore(&uhci->complete_list_lock, flags);
}

static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci, struct usb_device *dev)
{
	dma_addr_t dma_handle;
	struct uhci_td *td;

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	td = pci_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
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	if (!td)
		return NULL;

	td->dma_handle = dma_handle;

	td->link = UHCI_PTR_TERM;
	td->buffer = 0;

	td->frame = -1;
	td->dev = dev;

	INIT_LIST_HEAD(&td->list);
	INIT_LIST_HEAD(&td->fl_list);

	usb_get_dev(dev);

	return td;
}

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static inline void uhci_fill_td(struct uhci_td *td, __u32 status,
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		__u32 token, __u32 buffer)
{
	td->status = cpu_to_le32(status);
	td->token = cpu_to_le32(token);
	td->buffer = cpu_to_le32(buffer);
}

/*
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 * We insert Isochronous URB's directly into the frame list at the beginning
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 */
static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td, unsigned framenum)
{
	unsigned long flags;

	framenum %= UHCI_NUMFRAMES;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);

	td->frame = framenum;

	/* Is there a TD already mapped there? */
	if (uhci->fl->frame_cpu[framenum]) {
		struct uhci_td *ftd, *ltd;

		ftd = uhci->fl->frame_cpu[framenum];
		ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);

		list_add_tail(&td->fl_list, &ftd->fl_list);

		td->link = ltd->link;
		mb();
		ltd->link = cpu_to_le32(td->dma_handle);
	} else {
		td->link = uhci->fl->frame[framenum];
		mb();
		uhci->fl->frame[framenum] = cpu_to_le32(td->dma_handle);
		uhci->fl->frame_cpu[framenum] = td;
	}

	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

static void uhci_remove_td(struct uhci_hcd *uhci, struct uhci_td *td)
{
	unsigned long flags;

	/* If it's not inserted, don't remove it */
	spin_lock_irqsave(&uhci->frame_list_lock, flags);
	if (td->frame == -1 && list_empty(&td->fl_list))
		goto out;

	if (td->frame != -1 && uhci->fl->frame_cpu[td->frame] == td) {
		if (list_empty(&td->fl_list)) {
			uhci->fl->frame[td->frame] = td->link;
			uhci->fl->frame_cpu[td->frame] = NULL;
		} else {
			struct uhci_td *ntd;

			ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
			uhci->fl->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
			uhci->fl->frame_cpu[td->frame] = ntd;
		}
	} else {
		struct uhci_td *ptd;

		ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
		ptd->link = td->link;
	}

	mb();
	td->link = UHCI_PTR_TERM;

	list_del_init(&td->fl_list);
	td->frame = -1;

out:
	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

/*
 * Inserts a td into qh list at the top.
 */
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static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct urb *urb, u32 breadth)
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{
	struct list_head *tmp, *head;
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	struct uhci_td *td, *ptd;

	if (list_empty(&urbp->td_list))
		return;

	head = &urbp->td_list;
	tmp = head->next;

	/* Ordering isn't important here yet since the QH hasn't been */
	/*  inserted into the schedule yet */
	td = list_entry(tmp, struct uhci_td, list);

	/* Add the first TD to the QH element pointer */
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	qh->element = cpu_to_le32(td->dma_handle) | breadth;
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	ptd = td;

	/* Then link the rest of the TD's */
	tmp = tmp->next;
	while (tmp != head) {
		td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

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		ptd->link = cpu_to_le32(td->dma_handle) | breadth;
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		ptd = td;
	}

	ptd->link = UHCI_PTR_TERM;
}

static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
{
	if (!list_empty(&td->list))
		dbg("td %p is still in list!", td);
	if (!list_empty(&td->fl_list))
		dbg("td %p is still in fl_list!", td);

	if (td->dev)
		usb_put_dev(td->dev);

	pci_pool_free(uhci->td_pool, td, td->dma_handle);
}

static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, struct usb_device *dev)
{
	dma_addr_t dma_handle;
	struct uhci_qh *qh;

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	qh = pci_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
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	if (!qh)
		return NULL;

	qh->dma_handle = dma_handle;

	qh->element = UHCI_PTR_TERM;
	qh->link = UHCI_PTR_TERM;

	qh->dev = dev;
	qh->urbp = NULL;

	INIT_LIST_HEAD(&qh->list);
	INIT_LIST_HEAD(&qh->remove_list);

	usb_get_dev(dev);

	return qh;
}

static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
	if (!list_empty(&qh->list))
		dbg("qh %p list not empty!", qh);
	if (!list_empty(&qh->remove_list))
		dbg("qh %p still in remove_list!", qh);

	if (qh->dev)
		usb_put_dev(qh->dev);

	pci_pool_free(uhci->qh_pool, qh, qh->dma_handle);
}

/*
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 * Append this urb's qh after the last qh in skelqh->list
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 * MUST be called with uhci->frame_list_lock acquired
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 *
 * Note that urb_priv.queue_list doesn't have a separate queue head;
 * it's a ring with every element "live".
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 */
static void _uhci_insert_qh(struct uhci_hcd *uhci, struct uhci_qh *skelqh, struct urb *urb)
{
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
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	struct list_head *tmp;
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	struct uhci_qh *lqh;

	/* Grab the last QH */
	lqh = list_entry(skelqh->list.prev, struct uhci_qh, list);

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	/*
	 * Patch this endpoint's URB's QHs to point to the next skelqh:
	 *    skelqh --> ... lqh --> newqh --> next skelqh
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	 * Do this first, so the HC always sees the right QH after this one.
	 */
	list_for_each (tmp, &urbp->queue_list) {
		struct urb_priv *turbp =
			list_entry(tmp, struct urb_priv, queue_list);

		turbp->qh->link = lqh->link;
	}
	urbp->qh->link = lqh->link;
	wmb();				/* Ordering is important */

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	/*
	 * Patch QHs for previous endpoint's queued URBs?  HC goes
	 * here next, not to the next skelqh it now points to.
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	 *
	 *    lqh --> td ... --> qh ... --> td --> qh ... --> td
	 *     |                 |                 |
	 *     v                 v                 v
	 *     +<----------------+-----------------+
	 *     v
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	 *    newqh --> td ... --> td
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	 *     |
	 *     v
	 *    ...
	 *
	 * The HC could see (and use!) any of these as we write them.
	 */
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	if (lqh->urbp) {
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		list_for_each (tmp, &lqh->urbp->queue_list) {
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			struct urb_priv *turbp =
				list_entry(tmp, struct urb_priv, queue_list);

			turbp->qh->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
		}
	}
	lqh->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;

	list_add_tail(&urbp->qh->list, &skelqh->list);
}

static void uhci_insert_qh(struct uhci_hcd *uhci, struct uhci_qh *skelqh, struct urb *urb)
{
	unsigned long flags;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);
	_uhci_insert_qh(uhci, skelqh, urb);
	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

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/*
 * Start removal of QH from schedule; it finishes next frame.
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 * TDs should be unlinked before this is called.
 */
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static void uhci_remove_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
	unsigned long flags;
	struct uhci_qh *pqh;

	if (!qh)
		return;

	qh->urbp = NULL;

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	/*
	 * Only go through the hoops if it's actually linked in
	 * Queued QHs are removed in uhci_delete_queued_urb,
	 * since (for queued URBs) the pqh is pointed to the next
	 * QH in the queue, not the next endpoint's QH.
	 */
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	spin_lock_irqsave(&uhci->frame_list_lock, flags);
	if (!list_empty(&qh->list)) {
		pqh = list_entry(qh->list.prev, struct uhci_qh, list);

		if (pqh->urbp) {
			struct list_head *head, *tmp;

			head = &pqh->urbp->queue_list;
			tmp = head->next;
			while (head != tmp) {
				struct urb_priv *turbp =
					list_entry(tmp, struct urb_priv, queue_list);

				tmp = tmp->next;

				turbp->qh->link = qh->link;
			}
		}

		pqh->link = qh->link;
		mb();
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		/* Leave qh->link in case the HC is on the QH now, it will */
		/* continue the rest of the schedule */
		qh->element = UHCI_PTR_TERM;
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		list_del_init(&qh->list);
	}
	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);

	spin_lock_irqsave(&uhci->qh_remove_list_lock, flags);

	/* Check to see if the remove list is empty. Set the IOC bit */
	/* to force an interrupt so we can remove the QH */
	if (list_empty(&uhci->qh_remove_list))
		uhci_set_next_interrupt(uhci);

	list_add(&qh->remove_list, &uhci->qh_remove_list);

	spin_unlock_irqrestore(&uhci->qh_remove_list_lock, flags);
}

static int uhci_fixup_toggle(struct urb *urb, unsigned int toggle)
{
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	struct list_head *head, *tmp;

	head = &urbp->td_list;
	tmp = head->next;
	while (head != tmp) {
		struct uhci_td *td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

		if (toggle)
			td->token |= cpu_to_le32(TD_TOKEN_TOGGLE);
		else
			td->token &= ~cpu_to_le32(TD_TOKEN_TOGGLE);


		toggle ^= 1;
	}

	return toggle;
}

/* This function will append one URB's QH to another URB's QH. This is for */
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/* queuing interrupt, control or bulk transfers */
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static void uhci_append_queued_urb(struct uhci_hcd *uhci, struct urb *eurb, struct urb *urb)
{
	struct urb_priv *eurbp, *urbp, *furbp, *lurbp;
	struct list_head *tmp;
	struct uhci_td *lltd;
	unsigned long flags;

	eurbp = eurb->hcpriv;
	urbp = urb->hcpriv;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);

	/* Find the first URB in the queue */
	if (eurbp->queued) {
		struct list_head *head = &eurbp->queue_list;

		tmp = head->next;
		while (tmp != head) {
			struct urb_priv *turbp =
				list_entry(tmp, struct urb_priv, queue_list);

			if (!turbp->queued)
				break;

			tmp = tmp->next;
		}
	} else
		tmp = &eurbp->queue_list;

	furbp = list_entry(tmp, struct urb_priv, queue_list);
	lurbp = list_entry(furbp->queue_list.prev, struct urb_priv, queue_list);

	lltd = list_entry(lurbp->td_list.prev, struct uhci_td, list);

	usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe),
		uhci_fixup_toggle(urb, uhci_toggle(td_token(lltd)) ^ 1));

	/* All qh's in the queue need to link to the next queue */
	urbp->qh->link = eurbp->qh->link;

	mb();			/* Make sure we flush everything */
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	lltd->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;

	list_add_tail(&urbp->queue_list, &furbp->queue_list);

	urbp->queued = 1;

	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

static void uhci_delete_queued_urb(struct uhci_hcd *uhci, struct urb *urb)
{
	struct urb_priv *urbp, *nurbp;
	struct list_head *head, *tmp;
	struct urb_priv *purbp;
	struct uhci_td *pltd;
	unsigned int toggle;
	unsigned long flags;

	urbp = urb->hcpriv;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);

	if (list_empty(&urbp->queue_list))
		goto out;

	nurbp = list_entry(urbp->queue_list.next, struct urb_priv, queue_list);

	/* Fix up the toggle for the next URB's */
	if (!urbp->queued)
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		/* We just set the toggle in uhci_unlink_generic */
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		toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
	else {
		/* If we're in the middle of the queue, grab the toggle */
		/*  from the TD previous to us */
		purbp = list_entry(urbp->queue_list.prev, struct urb_priv,
				queue_list);

		pltd = list_entry(purbp->td_list.prev, struct uhci_td, list);

		toggle = uhci_toggle(td_token(pltd)) ^ 1;
	}

	head = &urbp->queue_list;
	tmp = head->next;
	while (head != tmp) {
		struct urb_priv *turbp;

		turbp = list_entry(tmp, struct urb_priv, queue_list);

		tmp = tmp->next;

		if (!turbp->queued)
			break;

		toggle = uhci_fixup_toggle(turbp->urb, toggle);
	}

	usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
		usb_pipeout(urb->pipe), toggle);

	if (!urbp->queued) {
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		struct uhci_qh *pqh;

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		nurbp->queued = 0;

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		/*
		 * Fixup the previous QH's queue to link to the new head
		 * of this queue.
		 */
		pqh = list_entry(urbp->qh->list.prev, struct uhci_qh, list);

		if (pqh->urbp) {
			struct list_head *head, *tmp;

			head = &pqh->urbp->queue_list;
			tmp = head->next;
			while (head != tmp) {
				struct urb_priv *turbp =
					list_entry(tmp, struct urb_priv, queue_list);

				tmp = tmp->next;

				turbp->qh->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
			}
		}

		pqh->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;

		list_add_tail(&nurbp->qh->list, &urbp->qh->list);
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		list_del_init(&urbp->qh->list);
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	} else {
		/* We're somewhere in the middle (or end). A bit trickier */
		/*  than the head scenario */
		purbp = list_entry(urbp->queue_list.prev, struct urb_priv,
				queue_list);

		pltd = list_entry(purbp->td_list.prev, struct uhci_td, list);
		if (nurbp->queued)
			pltd->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
		else
			/* The next URB happens to be the beginning, so */
			/*  we're the last, end the chain */
			pltd->link = UHCI_PTR_TERM;
	}

	list_del_init(&urbp->queue_list);

out:
	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

static struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
{
	struct urb_priv *urbp;

	urbp = kmem_cache_alloc(uhci_up_cachep, SLAB_ATOMIC);
	if (!urbp) {
		err("uhci_alloc_urb_priv: couldn't allocate memory for urb_priv\n");
		return NULL;
	}

	memset((void *)urbp, 0, sizeof(*urbp));

	urbp->inserttime = jiffies;
	urbp->fsbrtime = jiffies;
	urbp->urb = urb;
	urbp->dev = urb->dev;
	
	INIT_LIST_HEAD(&urbp->td_list);
	INIT_LIST_HEAD(&urbp->queue_list);
	INIT_LIST_HEAD(&urbp->complete_list);
	INIT_LIST_HEAD(&urbp->urb_list);

	list_add_tail(&urbp->urb_list, &uhci->urb_list);

	urb->hcpriv = urbp;

	return urbp;
}

/*
 * MUST be called with urb->lock acquired
 */
static void uhci_add_td_to_urb(struct urb *urb, struct uhci_td *td)
{
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;

	td->urb = urb;

	list_add_tail(&td->list, &urbp->td_list);
}

/*
 * MUST be called with urb->lock acquired
 */
static void uhci_remove_td_from_urb(struct uhci_td *td)
{
	if (list_empty(&td->list))
		return;

	list_del_init(&td->list);

	td->urb = NULL;
}

/*
 * MUST be called with urb->lock acquired
 */
static void uhci_destroy_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
{
	struct list_head *head, *tmp;
	struct urb_priv *urbp;

	urbp = (struct urb_priv *)urb->hcpriv;
	if (!urbp)
		return;

	if (!list_empty(&urbp->urb_list))
		warn("uhci_destroy_urb_priv: urb %p still on uhci->urb_list or uhci->remove_list", urb);

	if (!list_empty(&urbp->complete_list))
		warn("uhci_destroy_urb_priv: urb %p still on uhci->complete_list", urb);

	head = &urbp->td_list;
	tmp = head->next;
	while (tmp != head) {
		struct uhci_td *td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

		uhci_remove_td_from_urb(td);
		uhci_remove_td(uhci, td);
		uhci_free_td(uhci, td);
	}

	urb->hcpriv = NULL;
	kmem_cache_free(uhci_up_cachep, urbp);
}

static void uhci_inc_fsbr(struct uhci_hcd *uhci, struct urb *urb)
{
	unsigned long flags;
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);

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	if ((!(urb->transfer_flags & URB_NO_FSBR)) && !urbp->fsbr) {
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		urbp->fsbr = 1;
		if (!uhci->fsbr++ && !uhci->fsbrtimeout)
			uhci->skel_term_qh->link = cpu_to_le32(uhci->skel_hs_control_qh->dma_handle) | UHCI_PTR_QH;
	}

	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

static void uhci_dec_fsbr(struct uhci_hcd *uhci, struct urb *urb)
{
	unsigned long flags;
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;

	spin_lock_irqsave(&uhci->frame_list_lock, flags);

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	if ((!(urb->transfer_flags & URB_NO_FSBR)) && urbp->fsbr) {
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		urbp->fsbr = 0;
		if (!--uhci->fsbr)
			uhci->fsbrtimeout = jiffies + FSBR_DELAY;
	}

	spin_unlock_irqrestore(&uhci->frame_list_lock, flags);
}

/*
 * 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 -EOVERFLOW;
	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
 */
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static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
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{
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	struct uhci_td *td;
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	struct uhci_qh *qh, *skelqh;
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	unsigned long destination, status;
	int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
	int len = urb->transfer_buffer_length;
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	dma_addr_t data = urb->transfer_dma;
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	/* The "pipe" thing contains the destination in bits 8--18 */
	destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;

	/* 3 errors */
	status = TD_CTRL_ACTIVE | uhci_maxerr(3);
	if (urb->dev->speed == USB_SPEED_LOW)
		status |= TD_CTRL_LS;

	/*
	 * Build the TD for the control request
	 */
	td = uhci_alloc_td(uhci, urb->dev);
	if (!td)
		return -ENOMEM;

	uhci_add_td_to_urb(urb, td);
	uhci_fill_td(td, status, destination | uhci_explen(7),
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		urb->setup_dma);
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	/*
	 * 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));

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	if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
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		status |= TD_CTRL_SPD;

	/*
	 * Build the DATA TD's
	 */
	while (len > 0) {
		int pktsze = len;

		if (pktsze > maxsze)
			pktsze = maxsze;

		td = uhci_alloc_td(uhci, urb->dev);
		if (!td)
			return -ENOMEM;

		/* Alternate Data0/1 (start with Data1) */
		destination ^= TD_TOKEN_TOGGLE;
	
		uhci_add_td_to_urb(urb, td);
		uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1),
			data);

		data += pktsze;
		len -= pktsze;
	}

	/*
	 * Build the final TD for control status 
	 */
	td = uhci_alloc_td(uhci, urb->dev);
	if (!td)
		return -ENOMEM;

	/*
	 * It's IN if the pipe is an output pipe or we're not expecting
	 * data back.
	 */
	destination &= ~TD_TOKEN_PID_MASK;
	if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length)
		destination |= USB_PID_IN;
	else
		destination |= USB_PID_OUT;

	destination |= 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_explen(UHCI_NULL_DATA_SIZE), 0);

	qh = uhci_alloc_qh(uhci, urb->dev);
	if (!qh)
		return -ENOMEM;

	urbp->qh = qh;
	qh->urbp = urbp;

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	uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);

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	/* Low speed transfers get a different queue, and won't hog the bus */
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	if (urb->dev->speed == USB_SPEED_LOW)
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		skelqh = uhci->skel_ls_control_qh;
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	else {
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		skelqh = uhci->skel_hs_control_qh;
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		uhci_inc_fsbr(uhci, urb);
	}

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	if (eurb)
		uhci_append_queued_urb(uhci, eurb, urb);
	else
		uhci_insert_qh(uhci, skelqh, urb);

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	return -EINPROGRESS;
}

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/*
 * If control was short, then end status packet wasn't sent, so this
 * reorganize s so it's sent to finish the transfer.  The original QH is
 * removed from the skel and discarded; all TDs except the last (status)
 * are deleted; the last (status) TD is put on a new QH which is reinserted
 * into the skel.  Since the last TD and urb_priv are reused, the TD->link
 * and urb_priv maintain any queued QHs.
 */
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static int usb_control_retrigger_status(struct uhci_hcd *uhci, struct urb *urb)
{
	struct list_head *tmp, *head;
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;

	urbp->short_control_packet = 1;

	/* Create a new QH to avoid pointer overwriting problems */
	uhci_remove_qh(uhci, urbp->qh);

	/* Delete all of the TD's except for the status TD at the end */
	head = &urbp->td_list;
	tmp = head->next;
	while (tmp != head && tmp->next != head) {
		struct uhci_td *td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

		uhci_remove_td_from_urb(td);
		uhci_remove_td(uhci, td);
		uhci_free_td(uhci, td);
	}

	urbp->qh = uhci_alloc_qh(uhci, urb->dev);
	if (!urbp->qh) {
		err("unable to allocate new QH for control retrigger");
		return -ENOMEM;
	}

	urbp->qh->urbp = urbp;

	/* One TD, who cares about Breadth first? */
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	uhci_insert_tds_in_qh(urbp->qh, urb, UHCI_PTR_DEPTH);
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	/* Low speed transfers get a different queue */
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	if (urb->dev->speed == USB_SPEED_LOW)
		uhci_insert_qh(uhci, uhci->skel_ls_control_qh, urb);
	else
		uhci_insert_qh(uhci, uhci->skel_hs_control_qh, urb);

	return -EINPROGRESS;
}


static int uhci_result_control(struct uhci_hcd *uhci, struct urb *urb)
{
	struct list_head *tmp, *head;
	struct urb_priv *urbp = urb->hcpriv;
	struct uhci_td *td;
	unsigned int status;
	int ret = 0;

	if (list_empty(&urbp->td_list))
		return -EINVAL;

	head = &urbp->td_list;

	if (urbp->short_control_packet) {
		tmp = head->prev;
		goto status_phase;
	}

	tmp = head->next;
	td = list_entry(tmp, struct uhci_td, list);

	/* The first TD is the SETUP phase, check the status, but skip */
	/*  the count */
	status = uhci_status_bits(td_status(td));
	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 */
	tmp = tmp->next;
	while (tmp != head && tmp->next != head) {
		td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

		status = uhci_status_bits(td_status(td));
		if (status & TD_CTRL_ACTIVE)
			return -EINPROGRESS;

		urb->actual_length += uhci_actual_length(td_status(td));

		if (status)
			goto td_error;

		/* Check to see if we received a short packet */
		if (uhci_actual_length(td_status(td)) < uhci_expected_length(td_token(td))) {
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			if (urb->transfer_flags & URB_SHORT_NOT_OK) {
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				ret = -EREMOTEIO;
				goto err;
			}

			if (uhci_packetid(td_token(td)) == USB_PID_IN)
				return usb_control_retrigger_status(uhci, urb);
			else
				return 0;
		}
	}

status_phase:
	td = list_entry(tmp, struct uhci_td, list);

	/* Control status phase */
	status = td_status(td);

#ifdef I_HAVE_BUGGY_APC_BACKUPS
	/* APC BackUPS Pro kludge */
	/* It tries to send all of the descriptor instead of the amount */
	/*  we requested */
	if (status & TD_CTRL_IOC &&	/* IOC is masked out by uhci_status_bits */
	    status & TD_CTRL_ACTIVE &&
	    status & TD_CTRL_NAK)
		return 0;
#endif

	if (status & TD_CTRL_ACTIVE)
		return -EINPROGRESS;

	if (uhci_status_bits(status))
		goto td_error;

	return 0;

td_error:
	ret = uhci_map_status(status, uhci_packetout(td_token(td)));

err:
	if ((debug == 1 && ret != -EPIPE) || debug > 1) {
		/* Some debugging code */
		dbg("uhci_result_control() failed with status %x", status);

		if (errbuf) {
			/* Print the chain for debugging purposes */
			uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);

			lprintk(errbuf);
		}
	}

	return ret;
}

/*
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 * Common submit for bulk and interrupt
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 */
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static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb, struct uhci_qh *skelqh)
1072 1073
{
	struct uhci_td *td;
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	struct uhci_qh *qh;
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	unsigned long destination, status;
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	int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
	int len = urb->transfer_buffer_length;
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	dma_addr_t data = urb->transfer_dma;
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1081
	if (len < 0)
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		return -EINVAL;

	/* The "pipe" thing contains the destination in bits 8--18 */
	destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);

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	status = uhci_maxerr(3) | TD_CTRL_ACTIVE;
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	if (urb->dev->speed == USB_SPEED_LOW)
		status |= TD_CTRL_LS;
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	if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
		status |= TD_CTRL_SPD;
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	/*
	 * Build the DATA TD's
	 */
	do {	/* Allow zero length packets */
		int pktsze = len;
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		if (pktsze > maxsze)
			pktsze = maxsze;
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		td = uhci_alloc_td(uhci, urb->dev);
		if (!td)
			return -ENOMEM;
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		uhci_add_td_to_urb(urb, td);
		uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1) |
			(usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
			 usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
			data);
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		data += pktsze;
		len -= maxsze;

		usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
			usb_pipeout(urb->pipe));
	} while (len > 0);

	/*
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	 * URB_ZERO_PACKET means adding a 0-length packet, if direction
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	 * is OUT and the transfer_length was an exact multiple of maxsze,
	 * hence (len = transfer_length - N * maxsze) == 0
	 * however, if transfer_length == 0, the zero packet was already
	 * prepared above.
	 */
1126
	if (usb_pipeout(urb->pipe) && (urb->transfer_flags & URB_ZERO_PACKET) &&
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	    !len && urb->transfer_buffer_length) {
		td = uhci_alloc_td(uhci, urb->dev);
		if (!td)
			return -ENOMEM;

		uhci_add_td_to_urb(urb, td);
		uhci_fill_td(td, status, destination | uhci_explen(UHCI_NULL_DATA_SIZE) |
			(usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
			 usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
			data);

		usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
			usb_pipeout(urb->pipe));
	}

	/* Set the flag on the last packet */
	td->status |= cpu_to_le32(TD_CTRL_IOC);

	qh = uhci_alloc_qh(uhci, urb->dev);
	if (!qh)
		return -ENOMEM;

	urbp->qh = qh;
	qh->urbp = urbp;

	/* Always breadth first */
	uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);

	if (eurb)
		uhci_append_queued_urb(uhci, eurb, urb);
	else
		uhci_insert_qh(uhci, skelqh, urb);
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	return -EINPROGRESS;
}

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/*
 * Common result for bulk and interrupt
 */
static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
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{
	struct list_head *tmp, *head;
	struct urb_priv *urbp = urb->hcpriv;
	struct uhci_td *td;
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	unsigned int status = 0;
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	int ret = 0;

	urb->actual_length = 0;

	head = &urbp->td_list;
	tmp = head->next;
	while (tmp != head) {
		td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

		status = uhci_status_bits(td_status(td));
		if (status & TD_CTRL_ACTIVE)
			return -EINPROGRESS;

		urb->actual_length += uhci_actual_length(td_status(td));

		if (status)
			goto td_error;

		if (uhci_actual_length(td_status(td)) < uhci_expected_length(td_token(td))) {
1193
			if (urb->transfer_flags & URB_SHORT_NOT_OK) {
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				ret = -EREMOTEIO;
				goto err;
			} else
				return 0;
		}
	}

	return 0;

td_error:
	ret = uhci_map_status(status, uhci_packetout(td_token(td)));
	if (ret == -EPIPE)
		/* endpoint has stalled - mark it halted */
		usb_endpoint_halt(urb->dev, uhci_endpoint(td_token(td)),
	    			uhci_packetout(td_token(td)));

err:
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	/* 
	 * Enable this chunk of code if you want to see some more debugging.
	 * But be careful, it has the tendancy to starve out khubd and prevent
	 * disconnects from happening successfully if you have a slow debug
	 * log interface (like a serial console.
	 */
#if 0
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	if ((debug == 1 && ret != -EPIPE) || debug > 1) {
		/* Some debugging code */
1220
		dbg("uhci_result_common() failed with status %x", status);
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		if (errbuf) {
			/* Print the chain for debugging purposes */
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			uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
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			lprintk(errbuf);
		}
	}
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#endif
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	return ret;
}

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static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
1234
{
1235
	int ret;
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	/* Can't have low speed bulk transfers */
	if (urb->dev->speed == USB_SPEED_LOW)
		return -EINVAL;

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	ret = uhci_submit_common(uhci, urb, eurb, uhci->skel_bulk_qh);
	if (ret == -EINPROGRESS)
		uhci_inc_fsbr(uhci, urb);
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1245 1246
	return ret;
}
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static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
{
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	/* USB 1.1 interrupt transfers only involve one packet per interval;
	 * that's the uhci_submit_common() "breadth first" policy.  Drivers
	 * can submit urbs of any length, but longer ones might need many
	 * intervals to complete.
	 */
1255
	return uhci_submit_common(uhci, urb, eurb, uhci->skelqh[__interval_to_skel(urb->interval)]);
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}

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/*
 * Bulk and interrupt use common result
 */
#define uhci_result_bulk uhci_result_common
#define uhci_result_interrupt uhci_result_common
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/*
 * Isochronous transfers
 */
static int isochronous_find_limits(struct uhci_hcd *uhci, struct urb *urb, unsigned int *start, unsigned int *end)
{
	struct urb *last_urb = NULL;
	struct list_head *tmp, *head;
	int ret = 0;

	head = &uhci->urb_list;
	tmp = head->next;
	while (tmp != head) {
		struct urb_priv *up = list_entry(tmp, struct urb_priv, urb_list);
		struct urb *u = up->urb;

		tmp = tmp->next;

		/* 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;
		}
	}

	if (last_urb) {
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		*end = (last_urb->start_frame + last_urb->number_of_packets *
				last_urb->interval) & (UHCI_NUMFRAMES-1);
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		ret = 0;
	} else
		ret = -1;	/* no previous urb found */

	return ret;
}

static int isochronous_find_start(struct uhci_hcd *uhci, struct urb *urb)
{
	int limits;
	unsigned int start = 0, end = 0;

	if (urb->number_of_packets > 900)	/* 900? Why? */
		return -EFBIG;

	limits = isochronous_find_limits(uhci, urb, &start, &end);

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	if (urb->transfer_flags & URB_ISO_ASAP) {
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		if (limits) {
			int curframe;

			curframe = uhci_get_current_frame_number(uhci) % 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;
}

/*
 * Isochronous transfers
 */
static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb)
{
	struct uhci_td *td;
	int i, ret, frame;
	int status, destination;

	status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
	destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);

	ret = isochronous_find_start(uhci, urb);
	if (ret)
		return ret;

	frame = urb->start_frame;
	for (i = 0; i < urb->number_of_packets; i++, frame += urb->interval) {
		if (!urb->iso_frame_desc[i].length)
			continue;

		td = uhci_alloc_td(uhci, urb->dev);
		if (!td)
			return -ENOMEM;

		uhci_add_td_to_urb(urb, td);
		uhci_fill_td(td, status, destination | uhci_explen(urb->iso_frame_desc[i].length - 1),
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			urb->transfer_dma + urb->iso_frame_desc[i].offset);
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		if (i + 1 >= urb->number_of_packets)
			td->status |= cpu_to_le32(TD_CTRL_IOC);

		uhci_insert_td_frame_list(uhci, td, frame);
	}

	return -EINPROGRESS;
}

static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
{
	struct list_head *tmp, *head;
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	int status;
	int i, ret = 0;

	urb->actual_length = 0;

	i = 0;
	head = &urbp->td_list;
	tmp = head->next;
	while (tmp != head) {
		struct uhci_td *td = list_entry(tmp, struct uhci_td, list);
		int actlength;

		tmp = tmp->next;

		if (td_status(td) & TD_CTRL_ACTIVE)
			return -EINPROGRESS;

		actlength = uhci_actual_length(td_status(td));
		urb->iso_frame_desc[i].actual_length = actlength;
		urb->actual_length += actlength;

		status = uhci_map_status(uhci_status_bits(td_status(td)), usb_pipeout(urb->pipe));
		urb->iso_frame_desc[i].status = status;
		if (status) {
			urb->error_count++;
			ret = status;
		}

		i++;
	}

	return ret;
}

/*
 * MUST be called with uhci->urb_list_lock acquired
 */
static struct urb *uhci_find_urb_ep(struct uhci_hcd *uhci, struct urb *urb)
{
	struct list_head *tmp, *head;

	/* We don't match Isoc transfers since they are special */
	if (usb_pipeisoc(urb->pipe))
		return NULL;

	head = &uhci->urb_list;
	tmp = head->next;
	while (tmp != head) {
		struct urb_priv *up = list_entry(tmp, struct urb_priv, urb_list);
		struct urb *u = up->urb;

		tmp = tmp->next;

		if (u->dev == urb->dev && u->status == -EINPROGRESS) {
			/* For control, ignore the direction */
			if (usb_pipecontrol(urb->pipe) &&
			    (u->pipe & ~USB_DIR_IN) == (urb->pipe & ~USB_DIR_IN))
				return u;
			else if (u->pipe == urb->pipe)
				return u;
		}
	}

	return NULL;
}

static int uhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, int mem_flags)
{
	int ret = -EINVAL;
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	unsigned long flags;
	struct urb *eurb;
	int bustime;

	spin_lock_irqsave(&uhci->urb_list_lock, flags);

	eurb = uhci_find_urb_ep(uhci, urb);

	if (!uhci_alloc_urb_priv(uhci, urb)) {
		spin_unlock_irqrestore(&uhci->urb_list_lock, flags);
		return -ENOMEM;
	}

	switch (usb_pipetype(urb->pipe)) {
	case PIPE_CONTROL:
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		ret = uhci_submit_control(uhci, urb, eurb);
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		break;
	case PIPE_INTERRUPT:
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		if (!eurb) {
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			bustime = usb_check_bandwidth(urb->dev, urb);
			if (bustime < 0)
				ret = bustime;
			else {
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				ret = uhci_submit_interrupt(uhci, urb, eurb);
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				if (ret == -EINPROGRESS)
					usb_claim_bandwidth(urb->dev, urb, bustime, 0);
			}
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		} else {	/* inherit from parent */
			urb->bandwidth = eurb->bandwidth;
			ret = uhci_submit_interrupt(uhci, urb, eurb);
		}
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		break;
	case PIPE_BULK:
		ret = uhci_submit_bulk(uhci, urb, eurb);
		break;
	case PIPE_ISOCHRONOUS:
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		bustime = usb_check_bandwidth(urb->dev, urb);
		if (bustime < 0) {
			ret = bustime;
			break;
		}
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		ret = uhci_submit_isochronous(uhci, urb);
		if (ret == -EINPROGRESS)
			usb_claim_bandwidth(urb->dev, urb, bustime, 1);
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		break;
	}

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	if (ret != -EINPROGRESS) {
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		/* Submit failed, so delete it from the urb_list */
		struct urb_priv *urbp = urb->hcpriv;

		list_del_init(&urbp->urb_list);
		spin_unlock_irqrestore(&uhci->urb_list_lock, flags);
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		uhci_destroy_urb_priv (uhci, urb);
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		return ret;
	}
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	spin_unlock_irqrestore(&uhci->urb_list_lock, flags);

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	return 0;
}

/*
 * Return the result of a transfer
 *
 * MUST be called with urb_list_lock acquired
 */
static void uhci_transfer_result(struct uhci_hcd *uhci, struct urb *urb)
{
	int ret = -EINVAL;
	unsigned long flags;
	struct urb_priv *urbp;

	spin_lock_irqsave(&urb->lock, flags);

	urbp = (struct urb_priv *)urb->hcpriv;

	if (urb->status != -EINPROGRESS) {
		info("uhci_transfer_result: called for URB %p not in flight?", urb);
		goto out;
	}

	switch (usb_pipetype(urb->pipe)) {
	case PIPE_CONTROL:
		ret = uhci_result_control(uhci, urb);
		break;
	case PIPE_INTERRUPT:
		ret = uhci_result_interrupt(uhci, urb);
		break;
	case PIPE_BULK:
		ret = uhci_result_bulk(uhci, urb);
		break;
	case PIPE_ISOCHRONOUS:
		ret = uhci_result_isochronous(uhci, urb);
		break;
	}

	urbp->status = ret;

	if (ret == -EINPROGRESS)
		goto out;

	switch (usb_pipetype(urb->pipe)) {
	case PIPE_CONTROL:
	case PIPE_BULK:
	case PIPE_ISOCHRONOUS:
		/* Release bandwidth for Interrupt or Isoc. transfers */
		/* Spinlock needed ? */
		if (urb->bandwidth)
			usb_release_bandwidth(urb->dev, urb, 1);
		uhci_unlink_generic(uhci, urb);
		break;
	case PIPE_INTERRUPT:
		/* Release bandwidth for Interrupt or Isoc. transfers */
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		/* Make sure we don't release if we have a queued URB */
		spin_lock(&uhci->frame_list_lock);
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		/* Spinlock needed ? */
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		if (list_empty(&urbp->queue_list) && urb->bandwidth)
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			usb_release_bandwidth(urb->dev, urb, 0);
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		else
			/* bandwidth was passed on to queued URB, */
			/* so don't let usb_unlink_urb() release it */
			urb->bandwidth = 0;
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		spin_unlock(&uhci->frame_list_lock);
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		uhci_unlink_generic(uhci, urb);
		break;
	default:
		info("uhci_transfer_result: unknown pipe type %d for urb %p\n",
			usb_pipetype(urb->pipe), urb);
	}

	/* Remove it from uhci->urb_list */
	list_del_init(&urbp->urb_list);

	uhci_add_complete(uhci, urb);

out:
	spin_unlock_irqrestore(&urb->lock, flags);
}

/*
 * MUST be called with urb->lock acquired
 */
static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb)
{
	struct list_head *head, *tmp;
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	int prevactive = 1;

	/* We can get called when urbp allocation fails, so check */
	if (!urbp)
		return;

	uhci_dec_fsbr(uhci, urb);	/* Safe since it checks */

	/*
	 * Now we need to find out what the last successful toggle was
	 * so we can update the local data toggle for the next transfer
	 *
	 * There's 3 way's the last successful completed TD is found:
	 *
	 * 1) The TD is NOT active and the actual length < expected length
	 * 2) The TD is NOT active and it's the last TD in the chain
	 * 3) The TD is active and the previous TD is NOT active
	 *
	 * Control and Isochronous ignore the toggle, so this is safe
	 * for all types
	 */
	head = &urbp->td_list;
	tmp = head->next;
	while (tmp != head) {
		struct uhci_td *td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

		if (!(td_status(td) & TD_CTRL_ACTIVE) &&
		    (uhci_actual_length(td_status(td)) < uhci_expected_length(td_token(td)) ||
		    tmp == head))
			usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
				uhci_packetout(td_token(td)),
				uhci_toggle(td_token(td)) ^ 1);
		else if ((td_status(td) & TD_CTRL_ACTIVE) && !prevactive)
			usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
				uhci_packetout(td_token(td)),
				uhci_toggle(td_token(td)));

		prevactive = td_status(td) & TD_CTRL_ACTIVE;
	}

	uhci_delete_queued_urb(uhci, urb);

	/* The interrupt loop will reclaim the QH's */
	uhci_remove_qh(uhci, urbp->qh);
	urbp->qh = NULL;
}

static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	unsigned long flags;
	struct urb_priv *urbp = urb->hcpriv;

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	/* If this is an interrupt URB that is being killed in urb->complete, */
	/* then just set its status and return */
	if (!urbp) {
	  urb->status = -ECONNRESET;
	  return 0;
	}

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	spin_lock_irqsave(&uhci->urb_list_lock, flags);

	list_del_init(&urbp->urb_list);

	uhci_unlink_generic(uhci, urb);

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	spin_lock(&uhci->urb_remove_list_lock);
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	/* If we're the first, set the next interrupt bit */
	if (list_empty(&uhci->urb_remove_list))
		uhci_set_next_interrupt(uhci);
	list_add(&urbp->urb_list, &uhci->urb_remove_list);
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	spin_unlock(&uhci->urb_remove_list_lock);
	spin_unlock_irqrestore(&uhci->urb_list_lock, flags);
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	return 0;
}

static int uhci_fsbr_timeout(struct uhci_hcd *uhci, struct urb *urb)
{
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	struct list_head *head, *tmp;
	int count = 0;

	uhci_dec_fsbr(uhci, urb);

	urbp->fsbr_timeout = 1;

	/*
	 * Ideally we would want to fix qh->element as well, but it's
	 * read/write by the HC, so that can introduce a race. It's not
	 * really worth the hassle
	 */

	head = &urbp->td_list;
	tmp = head->next;
	while (tmp != head) {
		struct uhci_td *td = list_entry(tmp, struct uhci_td, list);

		tmp = tmp->next;

		/*
		 * Make sure we don't do the last one (since it'll have the
		 * TERM bit set) as well as we skip every so many TD's to
		 * make sure it doesn't hog the bandwidth
		 */
		if (tmp != head && (count % DEPTH_INTERVAL) == (DEPTH_INTERVAL - 1))
			td->link |= UHCI_PTR_DEPTH;

		count++;
	}

	return 0;
}

/*
 * uhci_get_current_frame_number()
 *
 * returns the current frame number for a USB bus/controller.
 */
static int uhci_get_current_frame_number(struct uhci_hcd *uhci)
{
	return inw(uhci->io_addr + USBFRNUM);
}

static int init_stall_timer(struct usb_hcd *hcd);

static void stall_callback(unsigned long ptr)
{
	struct usb_hcd *hcd = (struct usb_hcd *)ptr;
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	struct list_head list, *tmp, *head;
	unsigned long flags;

	INIT_LIST_HEAD(&list);

	spin_lock_irqsave(&uhci->urb_list_lock, flags);
	head = &uhci->urb_list;
	tmp = head->next;
	while (tmp != head) {
		struct urb_priv *up = list_entry(tmp, struct urb_priv, urb_list);
		struct urb *u = up->urb;

		tmp = tmp->next;

		spin_lock(&u->lock);

		/* Check if the FSBR timed out */
		if (up->fsbr && !up->fsbr_timeout && time_after_eq(jiffies, up->fsbrtime + IDLE_TIMEOUT))
			uhci_fsbr_timeout(uhci, u);

		/* Check if the URB timed out */
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		if (u->timeout && time_after_eq(jiffies, up->inserttime + u->timeout))
			list_move_tail(&up->urb_list, &list);
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		spin_unlock(&u->lock);
	}
	spin_unlock_irqrestore(&uhci->urb_list_lock, flags);

	head = &list;
	tmp = head->next;
	while (tmp != head) {
		struct urb_priv *up = list_entry(tmp, struct urb_priv, urb_list);
		struct urb *u = up->urb;

		tmp = tmp->next;

		uhci_urb_dequeue(hcd, u);
	}

	/* Really disable FSBR */
	if (!uhci->fsbr && uhci->fsbrtimeout && time_after_eq(jiffies, uhci->fsbrtimeout)) {
		uhci->fsbrtimeout = 0;
		uhci->skel_term_qh->link = UHCI_PTR_TERM;
	}

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	/* Poll for and perform state transitions */
	hc_state_transitions(uhci);
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	init_stall_timer(hcd);
}

static int init_stall_timer(struct usb_hcd *hcd)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);

	init_timer(&uhci->stall_timer);
	uhci->stall_timer.function = stall_callback;
	uhci->stall_timer.data = (unsigned long)hcd;
	uhci->stall_timer.expires = jiffies + (HZ / 10);
	add_timer(&uhci->stall_timer);

	return 0;
}

static void uhci_free_pending_qhs(struct uhci_hcd *uhci)
{
	struct list_head *tmp, *head;
	unsigned long flags;

	spin_lock_irqsave(&uhci->qh_remove_list_lock, flags);
	head = &uhci->qh_remove_list;
	tmp = head->next;
	while (tmp != head) {
		struct uhci_qh *qh = list_entry(tmp, struct uhci_qh, remove_list);

		tmp = tmp->next;

		list_del_init(&qh->remove_list);

		uhci_free_qh(uhci, qh);
	}
	spin_unlock_irqrestore(&uhci->qh_remove_list_lock, flags);
}

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static void uhci_finish_urb(struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
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{
	struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
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	int status;
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	unsigned long flags;

	spin_lock_irqsave(&urb->lock, flags);
	status = urbp->status;
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	uhci_destroy_urb_priv(uhci, urb);
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 	if (urb->status != -ENOENT && urb->status != -ECONNRESET)
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		urb->status = status;
	spin_unlock_irqrestore(&urb->lock, flags);

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	usb_hcd_giveback_urb(hcd, urb, regs);
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}

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static void uhci_finish_completion(struct usb_hcd *hcd, struct pt_regs *regs)
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{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	struct list_head *tmp, *head;
	unsigned long flags;

	spin_lock_irqsave(&uhci->complete_list_lock, flags);
	head = &uhci->complete_list;
	tmp = head->next;
	while (tmp != head) {
		struct urb_priv *urbp = list_entry(tmp, struct urb_priv, complete_list);
		struct urb *urb = urbp->urb;

		list_del_init(&urbp->complete_list);
		spin_unlock_irqrestore(&uhci->complete_list_lock, flags);

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		uhci_finish_urb(hcd, urb, regs);
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		spin_lock_irqsave(&uhci->complete_list_lock, flags);
		head = &uhci->complete_list;
		tmp = head->next;
	}
	spin_unlock_irqrestore(&uhci->complete_list_lock, flags);
}

static void uhci_remove_pending_qhs(struct uhci_hcd *uhci)
{
	struct list_head *tmp, *head;
	unsigned long flags;

	spin_lock_irqsave(&uhci->urb_remove_list_lock, flags);
	head = &uhci->urb_remove_list;
	tmp = head->next;
	while (tmp != head) {
		struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list);
		struct urb *urb = urbp->urb;

		tmp = tmp->next;

		list_del_init(&urbp->urb_list);

		urbp->status = urb->status = -ECONNRESET;

		uhci_add_complete(uhci, urb);
	}
	spin_unlock_irqrestore(&uhci->urb_remove_list_lock, flags);
}

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static void uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs)
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{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	unsigned int io_addr = uhci->io_addr;
	unsigned short status;
	struct list_head *tmp, *head;

	/*
	 * 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);		/* Clear it */

	if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
		if (status & USBSTS_HSE)
			err("%x: host system error, PCI problems?", io_addr);
		if (status & USBSTS_HCPE)
			err("%x: host controller process error. something bad happened", io_addr);
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		if ((status & USBSTS_HCH) && uhci->state > 0) {
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			err("%x: host controller halted. very bad", io_addr);
			/* FIXME: Reset the controller, fix the offending TD */
		}
	}

	if (status & USBSTS_RD)
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		uhci->resume_detect = 1;
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	uhci_free_pending_qhs(uhci);

	uhci_remove_pending_qhs(uhci);

	uhci_clear_next_interrupt(uhci);

	/* Walk the list of pending URB's to see which ones completed */
	spin_lock(&uhci->urb_list_lock);
	head = &uhci->urb_list;
	tmp = head->next;
	while (tmp != head) {
		struct urb_priv *urbp = list_entry(tmp, struct urb_priv, urb_list);
		struct urb *urb = urbp->urb;

		tmp = tmp->next;

		/* Checks the status and does all of the magic necessary */
		uhci_transfer_result(uhci, urb);
	}
	spin_unlock(&uhci->urb_list_lock);

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1921
	uhci_finish_completion(hcd, regs);
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}

static void reset_hc(struct uhci_hcd *uhci)
{
	unsigned int io_addr = uhci->io_addr;

	/* Global reset for 50ms */
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	uhci->state = UHCI_RESET;
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	outw(USBCMD_GRESET, io_addr + USBCMD);
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	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout((HZ*50+999) / 1000);
	set_current_state(TASK_RUNNING);
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	outw(0, io_addr + USBCMD);
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	/* Another 10ms delay */
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout((HZ*10+999) / 1000);
	set_current_state(TASK_RUNNING);
	uhci->resume_detect = 0;
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}

static void suspend_hc(struct uhci_hcd *uhci)
{
	unsigned int io_addr = uhci->io_addr;

	dbg("%x: suspend_hc", io_addr);
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	uhci->state = UHCI_SUSPENDED;
	uhci->resume_detect = 0;
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	outw(USBCMD_EGSM, io_addr + USBCMD);
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}

static void wakeup_hc(struct uhci_hcd *uhci)
{
	unsigned int io_addr = uhci->io_addr;

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	switch (uhci->state) {
		case UHCI_SUSPENDED:		/* Start the resume */
			dbg("%x: wakeup_hc", io_addr);
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			/* Global resume for >= 20ms */
			outw(USBCMD_FGR | USBCMD_EGSM, io_addr + USBCMD);
			uhci->state = UHCI_RESUMING_1;
			uhci->state_end = jiffies + (20*HZ+999) / 1000;
			break;
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		case UHCI_RESUMING_1:		/* End global resume */
			uhci->state = UHCI_RESUMING_2;
			outw(0, io_addr + USBCMD);
			/* Falls through */
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1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
		case UHCI_RESUMING_2:		/* Wait for EOP to be sent */
			if (inw(io_addr + USBCMD) & USBCMD_FGR)
				break;

			/* Run for at least 1 second, and
			 * mark it configured with a 64-byte max packet */
			uhci->state = UHCI_RUNNING_GRACE;
			uhci->state_end = jiffies + HZ;
			outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP,
					io_addr + USBCMD);
			break;

		case UHCI_RUNNING_GRACE:	/* Now allowed to suspend */
			uhci->state = UHCI_RUNNING;
			break;

		default:
			break;
	}
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}

static int ports_active(struct uhci_hcd *uhci)
{
	unsigned int io_addr = uhci->io_addr;
	int connection = 0;
	int i;

	for (i = 0; i < uhci->rh_numports; i++)
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		connection |= (inw(io_addr + USBPORTSC1 + i * 2) & USBPORTSC_CCS);
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	return connection;
}

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static int suspend_allowed(struct uhci_hcd *uhci)
{
	unsigned int io_addr = uhci->io_addr;
	int i;

	if (!uhci->hcd.pdev ||
	     uhci->hcd.pdev->vendor != PCI_VENDOR_ID_INTEL ||
	     uhci->hcd.pdev->device != PCI_DEVICE_ID_INTEL_82371AB_2)
		return 1;

	/* This is a 82371AB/EB/MB USB controller which has a bug that
	 * causes false resume indications if any port has an
	 * over current condition.  To prevent problems, we will not
	 * allow a global suspend if any ports are OC.
	 *
	 * Some motherboards using the 82371AB/EB/MB (but not the USB portion)
	 * appear to hardwire the over current inputs active to disable
	 * the USB ports.
	 */

	/* check for over current condition on any port */
	for (i = 0; i < uhci->rh_numports; i++) {
		if (inw(io_addr + USBPORTSC1 + i * 2) & USBPORTSC_OC)
			return 0;
	}

	return 1;
}

static void hc_state_transitions(struct uhci_hcd *uhci)
{
	switch (uhci->state) {
		case UHCI_RUNNING:

			/* global suspend if nothing connected for 1 second */
			if (!ports_active(uhci) && suspend_allowed(uhci)) {
				uhci->state = UHCI_SUSPENDING_GRACE;
				uhci->state_end = jiffies + HZ;
			}
			break;

		case UHCI_SUSPENDING_GRACE:
			if (ports_active(uhci))
				uhci->state = UHCI_RUNNING;
			else if (time_after_eq(jiffies, uhci->state_end))
				suspend_hc(uhci);
			break;

		case UHCI_SUSPENDED:

			/* wakeup if requested by a device */
			if (uhci->resume_detect)
				wakeup_hc(uhci);
			break;

		case UHCI_RESUMING_1:
		case UHCI_RESUMING_2:
		case UHCI_RUNNING_GRACE:
			if (time_after_eq(jiffies, uhci->state_end))
				wakeup_hc(uhci);
			break;

		default:
			break;
	}
}

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static void start_hc(struct uhci_hcd *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(uhci->fl->dma_handle, io_addr + USBFLBASEADD);

	/* Run and mark it configured with a 64-byte max packet */
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	uhci->state = UHCI_RUNNING_GRACE;
	uhci->state_end = jiffies + HZ;
2102
	outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, io_addr + USBCMD);
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        uhci->hcd.state = USB_STATE_READY;
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}

/*
 * De-allocate all resources..
 */
static void release_uhci(struct uhci_hcd *uhci)
{
	int i;

	for (i = 0; i < UHCI_NUM_SKELQH; i++)
		if (uhci->skelqh[i]) {
			uhci_free_qh(uhci, uhci->skelqh[i]);
			uhci->skelqh[i] = NULL;
		}

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	if (uhci->term_td) {
		uhci_free_td(uhci, uhci->term_td);
		uhci->term_td = NULL;
	}
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	if (uhci->qh_pool) {
		pci_pool_destroy(uhci->qh_pool);
		uhci->qh_pool = NULL;
	}

	if (uhci->td_pool) {
		pci_pool_destroy(uhci->td_pool);
		uhci->td_pool = NULL;
	}

	if (uhci->fl) {
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		pci_free_consistent(uhci->hcd.pdev, sizeof(*uhci->fl), uhci->fl, uhci->fl->dma_handle);
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		uhci->fl = NULL;
	}

#ifdef CONFIG_PROC_FS
	if (uhci->proc_entry) {
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		remove_proc_entry(uhci->hcd.self.bus_name, uhci_proc_root);
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		uhci->proc_entry = NULL;
	}
#endif
}

/*
 * 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, split into low and high speed
 *  - The third queue is bulk queue.
 *  - The fourth queue is the bandwidth reclamation queue, which loops back
 *    to the high speed control queue.
 */
static int __devinit uhci_start(struct usb_hcd *hcd)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	int retval = -EBUSY;
	int i, port;
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	unsigned io_size;
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	dma_addr_t dma_handle;
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	struct usb_device *udev;
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#ifdef CONFIG_PROC_FS
	struct proc_dir_entry *ent;
#endif

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	uhci->io_addr = (unsigned long) hcd->regs;
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	io_size = pci_resource_len(hcd->pdev, hcd->region);
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#ifdef CONFIG_PROC_FS
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	ent = create_proc_entry(hcd->self.bus_name, S_IFREG|S_IRUGO|S_IWUSR, uhci_proc_root);
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	if (!ent) {
		err("couldn't create uhci proc entry");
		retval = -ENOMEM;
		goto err_create_proc_entry;
	}

	ent->data = uhci;
	ent->proc_fops = &uhci_proc_operations;
	ent->size = 0;
	uhci->proc_entry = ent;
#endif

	/* Reset here so we don't get any interrupts from an old setup */
	/*  or broken setup */
	reset_hc(uhci);

	uhci->fsbr = 0;
	uhci->fsbrtimeout = 0;

	spin_lock_init(&uhci->qh_remove_list_lock);
	INIT_LIST_HEAD(&uhci->qh_remove_list);

	spin_lock_init(&uhci->urb_remove_list_lock);
	INIT_LIST_HEAD(&uhci->urb_remove_list);

	spin_lock_init(&uhci->urb_list_lock);
	INIT_LIST_HEAD(&uhci->urb_list);

	spin_lock_init(&uhci->complete_list_lock);
	INIT_LIST_HEAD(&uhci->complete_list);

	spin_lock_init(&uhci->frame_list_lock);

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	uhci->fl = pci_alloc_consistent(hcd->pdev, sizeof(*uhci->fl), &dma_handle);
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	if (!uhci->fl) {
		err("unable to allocate consistent memory for frame list");
		goto err_alloc_fl;
	}

	memset((void *)uhci->fl, 0, sizeof(*uhci->fl));

	uhci->fl->dma_handle = dma_handle;

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	uhci->td_pool = pci_pool_create("uhci_td", hcd->pdev,
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		sizeof(struct uhci_td), 16, 0);
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	if (!uhci->td_pool) {
		err("unable to create td pci_pool");
		goto err_create_td_pool;
	}

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	uhci->qh_pool = pci_pool_create("uhci_qh", hcd->pdev,
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		sizeof(struct uhci_qh), 16, 0);
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	if (!uhci->qh_pool) {
		err("unable to create qh pci_pool");
		goto err_create_qh_pool;
	}

	/* 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 */
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	for (port = 0; port < (io_size - 0x10) / 2; port++) {
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		unsigned int portstatus;

		portstatus = inw(uhci->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;

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	hcd->self.root_hub = udev = usb_alloc_dev(NULL, &hcd->self);
	if (!udev) {
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		err("unable to allocate root hub");
		goto err_alloc_root_hub;
	}

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	uhci->term_td = uhci_alloc_td(uhci, udev);
	if (!uhci->term_td) {
		err("unable to allocate terminating TD");
		goto err_alloc_term_td;
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	}

	for (i = 0; i < UHCI_NUM_SKELQH; i++) {
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		uhci->skelqh[i] = uhci_alloc_qh(uhci, udev);
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		if (!uhci->skelqh[i]) {
			err("unable to allocate QH %d", i);
			goto err_alloc_skelqh;
		}
	}

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	/*
	 * 8 Interrupt queues; link int2 to int1, int4 to int2, etc
	 * then link int1 to control and control to bulk
	 */
	uhci->skel_int128_qh->link = cpu_to_le32(uhci->skel_int64_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_int64_qh->link = cpu_to_le32(uhci->skel_int32_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_int32_qh->link = cpu_to_le32(uhci->skel_int16_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_int16_qh->link = cpu_to_le32(uhci->skel_int8_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_int8_qh->link = cpu_to_le32(uhci->skel_int4_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_int4_qh->link = cpu_to_le32(uhci->skel_int2_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_int2_qh->link = cpu_to_le32(uhci->skel_int1_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_int1_qh->link = cpu_to_le32(uhci->skel_ls_control_qh->dma_handle) | UHCI_PTR_QH;
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	uhci->skel_ls_control_qh->link = cpu_to_le32(uhci->skel_hs_control_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_hs_control_qh->link = cpu_to_le32(uhci->skel_bulk_qh->dma_handle) | UHCI_PTR_QH;
	uhci->skel_bulk_qh->link = cpu_to_le32(uhci->skel_term_qh->dma_handle) | UHCI_PTR_QH;

	/* This dummy TD is to work around a bug in Intel PIIX controllers */
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	uhci_fill_td(uhci->term_td, 0, (UHCI_NULL_DATA_SIZE << 21) |
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		(0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
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	uhci->term_td->link = cpu_to_le32(uhci->term_td->dma_handle);
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	uhci->skel_term_qh->link = UHCI_PTR_TERM;
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	uhci->skel_term_qh->element = cpu_to_le32(uhci->term_td->dma_handle);
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	/*
	 * 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 < UHCI_NUMFRAMES; i++) {
		int irq = 0;

		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 */
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		uhci->fl->frame[i] = cpu_to_le32(uhci->skelqh[7 - irq]->dma_handle);
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	}

	start_hc(uhci);

	init_stall_timer(hcd);

	/* disable legacy emulation */
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	pci_write_config_word(hcd->pdev, USBLEGSUP, USBLEGSUP_DEFAULT);
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	usb_connect(udev);
	udev->speed = USB_SPEED_FULL;
2353

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	if (usb_register_root_hub(udev, &hcd->pdev->dev) != 0) {
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		err("unable to start root hub");
		retval = -ENOMEM;
		goto err_start_root_hub;
	}

	return 0;

/*
 * error exits:
 */
err_start_root_hub:
	reset_hc(uhci);

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	del_timer_sync(&uhci->stall_timer);
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err_alloc_skelqh:
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	for (i = 0; i < UHCI_NUM_SKELQH; i++)
		if (uhci->skelqh[i]) {
			uhci_free_qh(uhci, uhci->skelqh[i]);
			uhci->skelqh[i] = NULL;
		}

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	uhci_free_td(uhci, uhci->term_td);
	uhci->term_td = NULL;
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2380
err_alloc_term_td:
2381
	usb_put_dev(udev);
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2382
	hcd->self.root_hub = NULL;
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err_alloc_root_hub:
	pci_pool_destroy(uhci->qh_pool);
	uhci->qh_pool = NULL;

err_create_qh_pool:
	pci_pool_destroy(uhci->td_pool);
	uhci->td_pool = NULL;

err_create_td_pool:
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	pci_free_consistent(hcd->pdev, sizeof(*uhci->fl), uhci->fl, uhci->fl->dma_handle);
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	uhci->fl = NULL;

err_alloc_fl:
#ifdef CONFIG_PROC_FS
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	remove_proc_entry(hcd->self.bus_name, uhci_proc_root);
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	uhci->proc_entry = NULL;

err_create_proc_entry:
#endif

	return retval;
}

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static void uhci_stop(struct usb_hcd *hcd)
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{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);

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	del_timer_sync(&uhci->stall_timer);
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	/*
	 * At this point, we're guaranteed that no new connects can be made
	 * to this bus since there are no more parents
	 */
	uhci_free_pending_qhs(uhci);
	uhci_remove_pending_qhs(uhci);

	reset_hc(uhci);

	uhci_free_pending_qhs(uhci);

	release_uhci(uhci);
}

#ifdef CONFIG_PM
static int uhci_suspend(struct usb_hcd *hcd, u32 state)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);

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	/* Don't try to suspend broken motherboards, reset instead */
	if (suspend_allowed(uhci))
		suspend_hc(uhci);
	else
		reset_hc(uhci);
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	return 0;
}

static int uhci_resume(struct usb_hcd *hcd)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);

2444
	pci_set_master(uhci->hcd.pdev);
2445

2446 2447 2448 2449 2450 2451
	if (uhci->state == UHCI_SUSPENDED)
		uhci->resume_detect = 1;
	else {
		reset_hc(uhci);
		start_hc(uhci);
	}
2452
	uhci->hcd.state = USB_STATE_READY;
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	return 0;
}
#endif

static struct usb_hcd *uhci_hcd_alloc(void)
{
	struct uhci_hcd *uhci;

	uhci = (struct uhci_hcd *)kmalloc(sizeof(*uhci), GFP_KERNEL);
	if (!uhci)
		return NULL;

	memset(uhci, 0, sizeof(*uhci));
	return &uhci->hcd;
}

static void uhci_hcd_free(struct usb_hcd *hcd)
{
	kfree(hcd_to_uhci(hcd));
}

static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
{
	return uhci_get_current_frame_number(hcd_to_uhci(hcd));
}

static const char hcd_name[] = "uhci-hcd";

static const struct hc_driver uhci_driver = {
2482
	.description =		hcd_name,
2483 2484

	/* Generic hardware linkage */
2485 2486
	.irq =			uhci_irq,
	.flags =		HCD_USB11,
2487 2488

	/* Basic lifecycle operations */
2489
	.start =		uhci_start,
2490
#ifdef CONFIG_PM
2491 2492
	.suspend =		uhci_suspend,
	.resume =		uhci_resume,
2493
#endif
2494
	.stop =			uhci_stop,
2495

2496 2497
	.hcd_alloc =		uhci_hcd_alloc,
	.hcd_free =		uhci_hcd_free,
2498

2499 2500
	.urb_enqueue =		uhci_urb_enqueue,
	.urb_dequeue =		uhci_urb_dequeue,
2501

2502
	.get_frame_number =	uhci_hcd_get_frame_number,
2503

2504 2505
	.hub_status_data =	uhci_hub_status_data,
	.hub_control =		uhci_hub_control,
2506 2507 2508 2509 2510
};

static const struct pci_device_id __devinitdata uhci_pci_ids[] = { {

	/* handle any USB UHCI controller */
2511 2512 2513
	.class = 		((PCI_CLASS_SERIAL_USB << 8) | 0x00),
	.class_mask = 	~0,
	.driver_data =	(unsigned long) &uhci_driver,
2514 2515

	/* no matter who makes it */
2516 2517 2518 2519
	.vendor =	PCI_ANY_ID,
	.device =	PCI_ANY_ID,
	.subvendor =	PCI_ANY_ID,
	.subdevice =	PCI_ANY_ID,
2520 2521 2522 2523 2524 2525 2526

	}, { /* end: all zeroes */ }
};

MODULE_DEVICE_TABLE(pci, uhci_pci_ids);

static struct pci_driver uhci_pci_driver = {
2527 2528
	.name =		(char *)hcd_name,
	.id_table =	uhci_pci_ids,
2529

2530 2531
	.probe =	usb_hcd_pci_probe,
	.remove =	usb_hcd_pci_remove,
2532 2533

#ifdef	CONFIG_PM
2534 2535
	.suspend =	usb_hcd_pci_suspend,
	.resume =	usb_hcd_pci_resume,
2536 2537 2538 2539 2540 2541 2542 2543 2544
#endif	/* PM */
};
 
static int __init uhci_hcd_init(void)
{
	int retval = -ENOMEM;

	info(DRIVER_DESC " " DRIVER_VERSION);

2545 2546 2547
	if (usb_disabled())
		return -ENODEV;

2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577
	if (debug) {
		errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
		if (!errbuf)
			goto errbuf_failed;
	}

#ifdef CONFIG_PROC_FS
	uhci_proc_root = create_proc_entry("driver/uhci", S_IFDIR, 0);
	if (!uhci_proc_root)
		goto proc_failed;
#endif

	uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
		sizeof(struct urb_priv), 0, 0, NULL, NULL);
	if (!uhci_up_cachep)
		goto up_failed;

	retval = pci_module_init(&uhci_pci_driver);
	if (retval)
		goto init_failed;

	return 0;

init_failed:
	if (kmem_cache_destroy(uhci_up_cachep))
		printk(KERN_INFO "uhci: not all urb_priv's were freed\n");

up_failed:

#ifdef CONFIG_PROC_FS
2578
	remove_proc_entry("driver/uhci", 0);
2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597

proc_failed:
#endif
	if (errbuf)
		kfree(errbuf);

errbuf_failed:

	return retval;
}

static void __exit uhci_hcd_cleanup(void) 
{
	pci_unregister_driver(&uhci_pci_driver);
	
	if (kmem_cache_destroy(uhci_up_cachep))
		printk(KERN_INFO "uhci: not all urb_priv's were freed\n");

#ifdef CONFIG_PROC_FS
2598
	remove_proc_entry("driver/uhci", 0);
2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611
#endif

	if (errbuf)
		kfree(errbuf);
}

module_init(uhci_hcd_init);
module_exit(uhci_hcd_cleanup);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");