xref: /openbmc/linux/drivers/usb/host/uhci-q.c (revision 5172046d960b27f7c22bed8038d696e7004cb112)
11da177e4SLinus Torvalds /*
21da177e4SLinus Torvalds  * Universal Host Controller Interface driver for USB.
31da177e4SLinus Torvalds  *
41da177e4SLinus Torvalds  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
51da177e4SLinus Torvalds  *
61da177e4SLinus Torvalds  * (C) Copyright 1999 Linus Torvalds
71da177e4SLinus Torvalds  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
81da177e4SLinus Torvalds  * (C) Copyright 1999 Randy Dunlap
91da177e4SLinus Torvalds  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
101da177e4SLinus Torvalds  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
111da177e4SLinus Torvalds  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
121da177e4SLinus Torvalds  * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
131da177e4SLinus Torvalds  * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
141da177e4SLinus Torvalds  *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
151da177e4SLinus Torvalds  * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
1617230acdSAlan Stern  * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
171da177e4SLinus Torvalds  */
181da177e4SLinus Torvalds 
191da177e4SLinus Torvalds 
201da177e4SLinus Torvalds /*
211da177e4SLinus Torvalds  * Technically, updating td->status here is a race, but it's not really a
221da177e4SLinus Torvalds  * problem. The worst that can happen is that we set the IOC bit again
231da177e4SLinus Torvalds  * generating a spurious interrupt. We could fix this by creating another
241da177e4SLinus Torvalds  * QH and leaving the IOC bit always set, but then we would have to play
251da177e4SLinus Torvalds  * games with the FSBR code to make sure we get the correct order in all
261da177e4SLinus Torvalds  * the cases. I don't think it's worth the effort
271da177e4SLinus Torvalds  */
28dccf4a48SAlan Stern static void uhci_set_next_interrupt(struct uhci_hcd *uhci)
291da177e4SLinus Torvalds {
306c1b445cSAlan Stern 	if (uhci->is_stopped)
311f09df8bSAlan Stern 		mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
321da177e4SLinus Torvalds 	uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC);
331da177e4SLinus Torvalds }
341da177e4SLinus Torvalds 
351da177e4SLinus Torvalds static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
361da177e4SLinus Torvalds {
371da177e4SLinus Torvalds 	uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
381da177e4SLinus Torvalds }
391da177e4SLinus Torvalds 
4084afddd7SAlan Stern 
4184afddd7SAlan Stern /*
4284afddd7SAlan Stern  * Full-Speed Bandwidth Reclamation (FSBR).
4384afddd7SAlan Stern  * We turn on FSBR whenever a queue that wants it is advancing,
4484afddd7SAlan Stern  * and leave it on for a short time thereafter.
4584afddd7SAlan Stern  */
4684afddd7SAlan Stern static void uhci_fsbr_on(struct uhci_hcd *uhci)
4784afddd7SAlan Stern {
48e009f1b2SAlan Stern 	struct uhci_qh *lqh;
4917230acdSAlan Stern 
50e009f1b2SAlan Stern 	/* The terminating skeleton QH always points back to the first
51e009f1b2SAlan Stern 	 * FSBR QH.  Make the last async QH point to the terminating
52e009f1b2SAlan Stern 	 * skeleton QH. */
5384afddd7SAlan Stern 	uhci->fsbr_is_on = 1;
5417230acdSAlan Stern 	lqh = list_entry(uhci->skel_async_qh->node.prev,
5517230acdSAlan Stern 			struct uhci_qh, node);
56e009f1b2SAlan Stern 	lqh->link = LINK_TO_QH(uhci->skel_term_qh);
5784afddd7SAlan Stern }
5884afddd7SAlan Stern 
5984afddd7SAlan Stern static void uhci_fsbr_off(struct uhci_hcd *uhci)
6084afddd7SAlan Stern {
6117230acdSAlan Stern 	struct uhci_qh *lqh;
6217230acdSAlan Stern 
63e009f1b2SAlan Stern 	/* Remove the link from the last async QH to the terminating
64e009f1b2SAlan Stern 	 * skeleton QH. */
6584afddd7SAlan Stern 	uhci->fsbr_is_on = 0;
6617230acdSAlan Stern 	lqh = list_entry(uhci->skel_async_qh->node.prev,
6717230acdSAlan Stern 			struct uhci_qh, node);
68e009f1b2SAlan Stern 	lqh->link = UHCI_PTR_TERM;
6984afddd7SAlan Stern }
7084afddd7SAlan Stern 
7184afddd7SAlan Stern static void uhci_add_fsbr(struct uhci_hcd *uhci, struct urb *urb)
7284afddd7SAlan Stern {
7384afddd7SAlan Stern 	struct urb_priv *urbp = urb->hcpriv;
7484afddd7SAlan Stern 
7584afddd7SAlan Stern 	if (!(urb->transfer_flags & URB_NO_FSBR))
7684afddd7SAlan Stern 		urbp->fsbr = 1;
7784afddd7SAlan Stern }
7884afddd7SAlan Stern 
79c5e3b741SAlan Stern static void uhci_urbp_wants_fsbr(struct uhci_hcd *uhci, struct urb_priv *urbp)
8084afddd7SAlan Stern {
8184afddd7SAlan Stern 	if (urbp->fsbr) {
82c5e3b741SAlan Stern 		uhci->fsbr_is_wanted = 1;
8384afddd7SAlan Stern 		if (!uhci->fsbr_is_on)
8484afddd7SAlan Stern 			uhci_fsbr_on(uhci);
85c5e3b741SAlan Stern 		else if (uhci->fsbr_expiring) {
86c5e3b741SAlan Stern 			uhci->fsbr_expiring = 0;
87c5e3b741SAlan Stern 			del_timer(&uhci->fsbr_timer);
8884afddd7SAlan Stern 		}
8984afddd7SAlan Stern 	}
90c5e3b741SAlan Stern }
91c5e3b741SAlan Stern 
92c5e3b741SAlan Stern static void uhci_fsbr_timeout(unsigned long _uhci)
93c5e3b741SAlan Stern {
94c5e3b741SAlan Stern 	struct uhci_hcd *uhci = (struct uhci_hcd *) _uhci;
95c5e3b741SAlan Stern 	unsigned long flags;
96c5e3b741SAlan Stern 
97c5e3b741SAlan Stern 	spin_lock_irqsave(&uhci->lock, flags);
98c5e3b741SAlan Stern 	if (uhci->fsbr_expiring) {
99c5e3b741SAlan Stern 		uhci->fsbr_expiring = 0;
100c5e3b741SAlan Stern 		uhci_fsbr_off(uhci);
101c5e3b741SAlan Stern 	}
102c5e3b741SAlan Stern 	spin_unlock_irqrestore(&uhci->lock, flags);
103c5e3b741SAlan Stern }
10484afddd7SAlan Stern 
10584afddd7SAlan Stern 
1062532178aSAlan Stern static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci)
1071da177e4SLinus Torvalds {
1081da177e4SLinus Torvalds 	dma_addr_t dma_handle;
1091da177e4SLinus Torvalds 	struct uhci_td *td;
1101da177e4SLinus Torvalds 
1111da177e4SLinus Torvalds 	td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
1121da177e4SLinus Torvalds 	if (!td)
1131da177e4SLinus Torvalds 		return NULL;
1141da177e4SLinus Torvalds 
1151da177e4SLinus Torvalds 	td->dma_handle = dma_handle;
1161da177e4SLinus Torvalds 	td->frame = -1;
1171da177e4SLinus Torvalds 
1181da177e4SLinus Torvalds 	INIT_LIST_HEAD(&td->list);
1191da177e4SLinus Torvalds 	INIT_LIST_HEAD(&td->fl_list);
1201da177e4SLinus Torvalds 
1211da177e4SLinus Torvalds 	return td;
1221da177e4SLinus Torvalds }
1231da177e4SLinus Torvalds 
124dccf4a48SAlan Stern static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
125dccf4a48SAlan Stern {
126*5172046dSArjan van de Ven 	if (!list_empty(&td->list))
127*5172046dSArjan van de Ven 		dev_WARN(uhci_dev(uhci), "td %p still in list!\n", td);
128*5172046dSArjan van de Ven 	if (!list_empty(&td->fl_list))
129*5172046dSArjan van de Ven 		dev_WARN(uhci_dev(uhci), "td %p still in fl_list!\n", td);
130dccf4a48SAlan Stern 
131dccf4a48SAlan Stern 	dma_pool_free(uhci->td_pool, td, td->dma_handle);
132dccf4a48SAlan Stern }
133dccf4a48SAlan Stern 
1341da177e4SLinus Torvalds static inline void uhci_fill_td(struct uhci_td *td, u32 status,
1351da177e4SLinus Torvalds 		u32 token, u32 buffer)
1361da177e4SLinus Torvalds {
1371da177e4SLinus Torvalds 	td->status = cpu_to_le32(status);
1381da177e4SLinus Torvalds 	td->token = cpu_to_le32(token);
1391da177e4SLinus Torvalds 	td->buffer = cpu_to_le32(buffer);
1401da177e4SLinus Torvalds }
1411da177e4SLinus Torvalds 
14204538a25SAlan Stern static void uhci_add_td_to_urbp(struct uhci_td *td, struct urb_priv *urbp)
14304538a25SAlan Stern {
14404538a25SAlan Stern 	list_add_tail(&td->list, &urbp->td_list);
14504538a25SAlan Stern }
14604538a25SAlan Stern 
14704538a25SAlan Stern static void uhci_remove_td_from_urbp(struct uhci_td *td)
14804538a25SAlan Stern {
14904538a25SAlan Stern 	list_del_init(&td->list);
15004538a25SAlan Stern }
15104538a25SAlan Stern 
1521da177e4SLinus Torvalds /*
153687f5f34SAlan Stern  * We insert Isochronous URBs directly into the frame list at the beginning
1541da177e4SLinus Torvalds  */
155dccf4a48SAlan Stern static inline void uhci_insert_td_in_frame_list(struct uhci_hcd *uhci,
156dccf4a48SAlan Stern 		struct uhci_td *td, unsigned framenum)
1571da177e4SLinus Torvalds {
1581da177e4SLinus Torvalds 	framenum &= (UHCI_NUMFRAMES - 1);
1591da177e4SLinus Torvalds 
1601da177e4SLinus Torvalds 	td->frame = framenum;
1611da177e4SLinus Torvalds 
1621da177e4SLinus Torvalds 	/* Is there a TD already mapped there? */
163a1d59ce8SAlan Stern 	if (uhci->frame_cpu[framenum]) {
1641da177e4SLinus Torvalds 		struct uhci_td *ftd, *ltd;
1651da177e4SLinus Torvalds 
166a1d59ce8SAlan Stern 		ftd = uhci->frame_cpu[framenum];
1671da177e4SLinus Torvalds 		ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
1681da177e4SLinus Torvalds 
1691da177e4SLinus Torvalds 		list_add_tail(&td->fl_list, &ftd->fl_list);
1701da177e4SLinus Torvalds 
1711da177e4SLinus Torvalds 		td->link = ltd->link;
1721da177e4SLinus Torvalds 		wmb();
17328b9325eSAlan Stern 		ltd->link = LINK_TO_TD(td);
1741da177e4SLinus Torvalds 	} else {
175a1d59ce8SAlan Stern 		td->link = uhci->frame[framenum];
1761da177e4SLinus Torvalds 		wmb();
17728b9325eSAlan Stern 		uhci->frame[framenum] = LINK_TO_TD(td);
178a1d59ce8SAlan Stern 		uhci->frame_cpu[framenum] = td;
1791da177e4SLinus Torvalds 	}
1801da177e4SLinus Torvalds }
1811da177e4SLinus Torvalds 
182dccf4a48SAlan Stern static inline void uhci_remove_td_from_frame_list(struct uhci_hcd *uhci,
183b81d3436SAlan Stern 		struct uhci_td *td)
1841da177e4SLinus Torvalds {
1851da177e4SLinus Torvalds 	/* If it's not inserted, don't remove it */
186b81d3436SAlan Stern 	if (td->frame == -1) {
187b81d3436SAlan Stern 		WARN_ON(!list_empty(&td->fl_list));
1881da177e4SLinus Torvalds 		return;
189b81d3436SAlan Stern 	}
1901da177e4SLinus Torvalds 
191b81d3436SAlan Stern 	if (uhci->frame_cpu[td->frame] == td) {
1921da177e4SLinus Torvalds 		if (list_empty(&td->fl_list)) {
193a1d59ce8SAlan Stern 			uhci->frame[td->frame] = td->link;
194a1d59ce8SAlan Stern 			uhci->frame_cpu[td->frame] = NULL;
1951da177e4SLinus Torvalds 		} else {
1961da177e4SLinus Torvalds 			struct uhci_td *ntd;
1971da177e4SLinus Torvalds 
1981da177e4SLinus Torvalds 			ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
19928b9325eSAlan Stern 			uhci->frame[td->frame] = LINK_TO_TD(ntd);
200a1d59ce8SAlan Stern 			uhci->frame_cpu[td->frame] = ntd;
2011da177e4SLinus Torvalds 		}
2021da177e4SLinus Torvalds 	} else {
2031da177e4SLinus Torvalds 		struct uhci_td *ptd;
2041da177e4SLinus Torvalds 
2051da177e4SLinus Torvalds 		ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
2061da177e4SLinus Torvalds 		ptd->link = td->link;
2071da177e4SLinus Torvalds 	}
2081da177e4SLinus Torvalds 
2091da177e4SLinus Torvalds 	list_del_init(&td->fl_list);
2101da177e4SLinus Torvalds 	td->frame = -1;
2111da177e4SLinus Torvalds }
2121da177e4SLinus Torvalds 
213c8155cc5SAlan Stern static inline void uhci_remove_tds_from_frame(struct uhci_hcd *uhci,
214c8155cc5SAlan Stern 		unsigned int framenum)
215c8155cc5SAlan Stern {
216c8155cc5SAlan Stern 	struct uhci_td *ftd, *ltd;
217c8155cc5SAlan Stern 
218c8155cc5SAlan Stern 	framenum &= (UHCI_NUMFRAMES - 1);
219c8155cc5SAlan Stern 
220c8155cc5SAlan Stern 	ftd = uhci->frame_cpu[framenum];
221c8155cc5SAlan Stern 	if (ftd) {
222c8155cc5SAlan Stern 		ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
223c8155cc5SAlan Stern 		uhci->frame[framenum] = ltd->link;
224c8155cc5SAlan Stern 		uhci->frame_cpu[framenum] = NULL;
225c8155cc5SAlan Stern 
226c8155cc5SAlan Stern 		while (!list_empty(&ftd->fl_list))
227c8155cc5SAlan Stern 			list_del_init(ftd->fl_list.prev);
228c8155cc5SAlan Stern 	}
229c8155cc5SAlan Stern }
230c8155cc5SAlan Stern 
231dccf4a48SAlan Stern /*
232dccf4a48SAlan Stern  * Remove all the TDs for an Isochronous URB from the frame list
233dccf4a48SAlan Stern  */
234dccf4a48SAlan Stern static void uhci_unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb)
235b81d3436SAlan Stern {
236b81d3436SAlan Stern 	struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
237b81d3436SAlan Stern 	struct uhci_td *td;
238b81d3436SAlan Stern 
239b81d3436SAlan Stern 	list_for_each_entry(td, &urbp->td_list, list)
240dccf4a48SAlan Stern 		uhci_remove_td_from_frame_list(uhci, td);
241b81d3436SAlan Stern }
242b81d3436SAlan Stern 
243dccf4a48SAlan Stern static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
244dccf4a48SAlan Stern 		struct usb_device *udev, struct usb_host_endpoint *hep)
2451da177e4SLinus Torvalds {
2461da177e4SLinus Torvalds 	dma_addr_t dma_handle;
2471da177e4SLinus Torvalds 	struct uhci_qh *qh;
2481da177e4SLinus Torvalds 
2491da177e4SLinus Torvalds 	qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
2501da177e4SLinus Torvalds 	if (!qh)
2511da177e4SLinus Torvalds 		return NULL;
2521da177e4SLinus Torvalds 
25359e29ed9SAlan Stern 	memset(qh, 0, sizeof(*qh));
2541da177e4SLinus Torvalds 	qh->dma_handle = dma_handle;
2551da177e4SLinus Torvalds 
2561da177e4SLinus Torvalds 	qh->element = UHCI_PTR_TERM;
2571da177e4SLinus Torvalds 	qh->link = UHCI_PTR_TERM;
2581da177e4SLinus Torvalds 
259dccf4a48SAlan Stern 	INIT_LIST_HEAD(&qh->queue);
260dccf4a48SAlan Stern 	INIT_LIST_HEAD(&qh->node);
2611da177e4SLinus Torvalds 
262dccf4a48SAlan Stern 	if (udev) {		/* Normal QH */
26385a975d0SAlan Stern 		qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
26485a975d0SAlan Stern 		if (qh->type != USB_ENDPOINT_XFER_ISOC) {
265af0bb599SAlan Stern 			qh->dummy_td = uhci_alloc_td(uhci);
266af0bb599SAlan Stern 			if (!qh->dummy_td) {
267af0bb599SAlan Stern 				dma_pool_free(uhci->qh_pool, qh, dma_handle);
268af0bb599SAlan Stern 				return NULL;
269af0bb599SAlan Stern 			}
27085a975d0SAlan Stern 		}
271dccf4a48SAlan Stern 		qh->state = QH_STATE_IDLE;
272dccf4a48SAlan Stern 		qh->hep = hep;
273dccf4a48SAlan Stern 		qh->udev = udev;
274dccf4a48SAlan Stern 		hep->hcpriv = qh;
2751da177e4SLinus Torvalds 
2763ca2a321SAlan Stern 		if (qh->type == USB_ENDPOINT_XFER_INT ||
2773ca2a321SAlan Stern 				qh->type == USB_ENDPOINT_XFER_ISOC)
2783ca2a321SAlan Stern 			qh->load = usb_calc_bus_time(udev->speed,
2793ca2a321SAlan Stern 					usb_endpoint_dir_in(&hep->desc),
2803ca2a321SAlan Stern 					qh->type == USB_ENDPOINT_XFER_ISOC,
2813ca2a321SAlan Stern 					le16_to_cpu(hep->desc.wMaxPacketSize))
2823ca2a321SAlan Stern 				/ 1000 + 1;
2833ca2a321SAlan Stern 
284dccf4a48SAlan Stern 	} else {		/* Skeleton QH */
285dccf4a48SAlan Stern 		qh->state = QH_STATE_ACTIVE;
2864de7d2c2SAlan Stern 		qh->type = -1;
287dccf4a48SAlan Stern 	}
2881da177e4SLinus Torvalds 	return qh;
2891da177e4SLinus Torvalds }
2901da177e4SLinus Torvalds 
2911da177e4SLinus Torvalds static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
2921da177e4SLinus Torvalds {
293dccf4a48SAlan Stern 	WARN_ON(qh->state != QH_STATE_IDLE && qh->udev);
294*5172046dSArjan van de Ven 	if (!list_empty(&qh->queue))
295*5172046dSArjan van de Ven 		dev_WARN(uhci_dev(uhci), "qh %p list not empty!\n", qh);
2961da177e4SLinus Torvalds 
297dccf4a48SAlan Stern 	list_del(&qh->node);
298dccf4a48SAlan Stern 	if (qh->udev) {
299dccf4a48SAlan Stern 		qh->hep->hcpriv = NULL;
30085a975d0SAlan Stern 		if (qh->dummy_td)
301af0bb599SAlan Stern 			uhci_free_td(uhci, qh->dummy_td);
302dccf4a48SAlan Stern 	}
3031da177e4SLinus Torvalds 	dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
3041da177e4SLinus Torvalds }
3051da177e4SLinus Torvalds 
3061da177e4SLinus Torvalds /*
307a0b458b6SAlan Stern  * When a queue is stopped and a dequeued URB is given back, adjust
308a0b458b6SAlan Stern  * the previous TD link (if the URB isn't first on the queue) or
309a0b458b6SAlan Stern  * save its toggle value (if it is first and is currently executing).
31010b8e47dSAlan Stern  *
31110b8e47dSAlan Stern  * Returns 0 if the URB should not yet be given back, 1 otherwise.
3120ed8fee1SAlan Stern  */
31310b8e47dSAlan Stern static int uhci_cleanup_queue(struct uhci_hcd *uhci, struct uhci_qh *qh,
314a0b458b6SAlan Stern 		struct urb *urb)
3150ed8fee1SAlan Stern {
316a0b458b6SAlan Stern 	struct urb_priv *urbp = urb->hcpriv;
3170ed8fee1SAlan Stern 	struct uhci_td *td;
31810b8e47dSAlan Stern 	int ret = 1;
3190ed8fee1SAlan Stern 
320a0b458b6SAlan Stern 	/* Isochronous pipes don't use toggles and their TD link pointers
32110b8e47dSAlan Stern 	 * get adjusted during uhci_urb_dequeue().  But since their queues
32210b8e47dSAlan Stern 	 * cannot truly be stopped, we have to watch out for dequeues
32310b8e47dSAlan Stern 	 * occurring after the nominal unlink frame. */
32410b8e47dSAlan Stern 	if (qh->type == USB_ENDPOINT_XFER_ISOC) {
32510b8e47dSAlan Stern 		ret = (uhci->frame_number + uhci->is_stopped !=
32610b8e47dSAlan Stern 				qh->unlink_frame);
327c5e3b741SAlan Stern 		goto done;
32810b8e47dSAlan Stern 	}
329a0b458b6SAlan Stern 
330a0b458b6SAlan Stern 	/* If the URB isn't first on its queue, adjust the link pointer
331a0b458b6SAlan Stern 	 * of the last TD in the previous URB.  The toggle doesn't need
332a0b458b6SAlan Stern 	 * to be saved since this URB can't be executing yet. */
333a0b458b6SAlan Stern 	if (qh->queue.next != &urbp->node) {
334a0b458b6SAlan Stern 		struct urb_priv *purbp;
335a0b458b6SAlan Stern 		struct uhci_td *ptd;
336a0b458b6SAlan Stern 
337a0b458b6SAlan Stern 		purbp = list_entry(urbp->node.prev, struct urb_priv, node);
338a0b458b6SAlan Stern 		WARN_ON(list_empty(&purbp->td_list));
339a0b458b6SAlan Stern 		ptd = list_entry(purbp->td_list.prev, struct uhci_td,
340a0b458b6SAlan Stern 				list);
341a0b458b6SAlan Stern 		td = list_entry(urbp->td_list.prev, struct uhci_td,
342a0b458b6SAlan Stern 				list);
343a0b458b6SAlan Stern 		ptd->link = td->link;
344c5e3b741SAlan Stern 		goto done;
345a0b458b6SAlan Stern 	}
346a0b458b6SAlan Stern 
3470ed8fee1SAlan Stern 	/* If the QH element pointer is UHCI_PTR_TERM then then currently
3480ed8fee1SAlan Stern 	 * executing URB has already been unlinked, so this one isn't it. */
349a0b458b6SAlan Stern 	if (qh_element(qh) == UHCI_PTR_TERM)
350c5e3b741SAlan Stern 		goto done;
3510ed8fee1SAlan Stern 	qh->element = UHCI_PTR_TERM;
3520ed8fee1SAlan Stern 
35385a975d0SAlan Stern 	/* Control pipes don't have to worry about toggles */
354a0b458b6SAlan Stern 	if (qh->type == USB_ENDPOINT_XFER_CONTROL)
355c5e3b741SAlan Stern 		goto done;
3560ed8fee1SAlan Stern 
357a0b458b6SAlan Stern 	/* Save the next toggle value */
35859e29ed9SAlan Stern 	WARN_ON(list_empty(&urbp->td_list));
35959e29ed9SAlan Stern 	td = list_entry(urbp->td_list.next, struct uhci_td, list);
3600ed8fee1SAlan Stern 	qh->needs_fixup = 1;
3610ed8fee1SAlan Stern 	qh->initial_toggle = uhci_toggle(td_token(td));
362c5e3b741SAlan Stern 
363c5e3b741SAlan Stern done:
36410b8e47dSAlan Stern 	return ret;
3650ed8fee1SAlan Stern }
3660ed8fee1SAlan Stern 
3670ed8fee1SAlan Stern /*
3680ed8fee1SAlan Stern  * Fix up the data toggles for URBs in a queue, when one of them
3690ed8fee1SAlan Stern  * terminates early (short transfer, error, or dequeued).
3700ed8fee1SAlan Stern  */
3710ed8fee1SAlan Stern static void uhci_fixup_toggles(struct uhci_qh *qh, int skip_first)
3720ed8fee1SAlan Stern {
3730ed8fee1SAlan Stern 	struct urb_priv *urbp = NULL;
3740ed8fee1SAlan Stern 	struct uhci_td *td;
3750ed8fee1SAlan Stern 	unsigned int toggle = qh->initial_toggle;
3760ed8fee1SAlan Stern 	unsigned int pipe;
3770ed8fee1SAlan Stern 
3780ed8fee1SAlan Stern 	/* Fixups for a short transfer start with the second URB in the
3790ed8fee1SAlan Stern 	 * queue (the short URB is the first). */
3800ed8fee1SAlan Stern 	if (skip_first)
3810ed8fee1SAlan Stern 		urbp = list_entry(qh->queue.next, struct urb_priv, node);
3820ed8fee1SAlan Stern 
3830ed8fee1SAlan Stern 	/* When starting with the first URB, if the QH element pointer is
3840ed8fee1SAlan Stern 	 * still valid then we know the URB's toggles are okay. */
3850ed8fee1SAlan Stern 	else if (qh_element(qh) != UHCI_PTR_TERM)
3860ed8fee1SAlan Stern 		toggle = 2;
3870ed8fee1SAlan Stern 
3880ed8fee1SAlan Stern 	/* Fix up the toggle for the URBs in the queue.  Normally this
3890ed8fee1SAlan Stern 	 * loop won't run more than once: When an error or short transfer
3900ed8fee1SAlan Stern 	 * occurs, the queue usually gets emptied. */
3911393adb2SAlan Stern 	urbp = list_prepare_entry(urbp, &qh->queue, node);
3920ed8fee1SAlan Stern 	list_for_each_entry_continue(urbp, &qh->queue, node) {
3930ed8fee1SAlan Stern 
3940ed8fee1SAlan Stern 		/* If the first TD has the right toggle value, we don't
3950ed8fee1SAlan Stern 		 * need to change any toggles in this URB */
3960ed8fee1SAlan Stern 		td = list_entry(urbp->td_list.next, struct uhci_td, list);
3970ed8fee1SAlan Stern 		if (toggle > 1 || uhci_toggle(td_token(td)) == toggle) {
398db59b464SAlan Stern 			td = list_entry(urbp->td_list.prev, struct uhci_td,
3990ed8fee1SAlan Stern 					list);
4000ed8fee1SAlan Stern 			toggle = uhci_toggle(td_token(td)) ^ 1;
4010ed8fee1SAlan Stern 
4020ed8fee1SAlan Stern 		/* Otherwise all the toggles in the URB have to be switched */
4030ed8fee1SAlan Stern 		} else {
4040ed8fee1SAlan Stern 			list_for_each_entry(td, &urbp->td_list, list) {
4050ed8fee1SAlan Stern 				td->token ^= __constant_cpu_to_le32(
4060ed8fee1SAlan Stern 							TD_TOKEN_TOGGLE);
4070ed8fee1SAlan Stern 				toggle ^= 1;
4080ed8fee1SAlan Stern 			}
4090ed8fee1SAlan Stern 		}
4100ed8fee1SAlan Stern 	}
4110ed8fee1SAlan Stern 
4120ed8fee1SAlan Stern 	wmb();
4130ed8fee1SAlan Stern 	pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe;
4140ed8fee1SAlan Stern 	usb_settoggle(qh->udev, usb_pipeendpoint(pipe),
4150ed8fee1SAlan Stern 			usb_pipeout(pipe), toggle);
4160ed8fee1SAlan Stern 	qh->needs_fixup = 0;
4170ed8fee1SAlan Stern }
4180ed8fee1SAlan Stern 
4190ed8fee1SAlan Stern /*
42017230acdSAlan Stern  * Link an Isochronous QH into its skeleton's list
42117230acdSAlan Stern  */
42217230acdSAlan Stern static inline void link_iso(struct uhci_hcd *uhci, struct uhci_qh *qh)
42317230acdSAlan Stern {
42417230acdSAlan Stern 	list_add_tail(&qh->node, &uhci->skel_iso_qh->node);
42517230acdSAlan Stern 
42617230acdSAlan Stern 	/* Isochronous QHs aren't linked by the hardware */
42717230acdSAlan Stern }
42817230acdSAlan Stern 
42917230acdSAlan Stern /*
43017230acdSAlan Stern  * Link a high-period interrupt QH into the schedule at the end of its
43117230acdSAlan Stern  * skeleton's list
43217230acdSAlan Stern  */
43317230acdSAlan Stern static void link_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh)
43417230acdSAlan Stern {
43517230acdSAlan Stern 	struct uhci_qh *pqh;
43617230acdSAlan Stern 
43717230acdSAlan Stern 	list_add_tail(&qh->node, &uhci->skelqh[qh->skel]->node);
43817230acdSAlan Stern 
43917230acdSAlan Stern 	pqh = list_entry(qh->node.prev, struct uhci_qh, node);
44017230acdSAlan Stern 	qh->link = pqh->link;
44117230acdSAlan Stern 	wmb();
44217230acdSAlan Stern 	pqh->link = LINK_TO_QH(qh);
44317230acdSAlan Stern }
44417230acdSAlan Stern 
44517230acdSAlan Stern /*
44617230acdSAlan Stern  * Link a period-1 interrupt or async QH into the schedule at the
44717230acdSAlan Stern  * correct spot in the async skeleton's list, and update the FSBR link
44817230acdSAlan Stern  */
44917230acdSAlan Stern static void link_async(struct uhci_hcd *uhci, struct uhci_qh *qh)
45017230acdSAlan Stern {
451e009f1b2SAlan Stern 	struct uhci_qh *pqh;
45217230acdSAlan Stern 	__le32 link_to_new_qh;
45317230acdSAlan Stern 
45417230acdSAlan Stern 	/* Find the predecessor QH for our new one and insert it in the list.
45517230acdSAlan Stern 	 * The list of QHs is expected to be short, so linear search won't
45617230acdSAlan Stern 	 * take too long. */
45717230acdSAlan Stern 	list_for_each_entry_reverse(pqh, &uhci->skel_async_qh->node, node) {
45817230acdSAlan Stern 		if (pqh->skel <= qh->skel)
45917230acdSAlan Stern 			break;
46017230acdSAlan Stern 	}
46117230acdSAlan Stern 	list_add(&qh->node, &pqh->node);
46217230acdSAlan Stern 
46317230acdSAlan Stern 	/* Link it into the schedule */
464e009f1b2SAlan Stern 	qh->link = pqh->link;
46517230acdSAlan Stern 	wmb();
466e009f1b2SAlan Stern 	link_to_new_qh = LINK_TO_QH(qh);
467e009f1b2SAlan Stern 	pqh->link = link_to_new_qh;
468e009f1b2SAlan Stern 
469e009f1b2SAlan Stern 	/* If this is now the first FSBR QH, link the terminating skeleton
470e009f1b2SAlan Stern 	 * QH to it. */
471e009f1b2SAlan Stern 	if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR)
472e009f1b2SAlan Stern 		uhci->skel_term_qh->link = link_to_new_qh;
47317230acdSAlan Stern }
47417230acdSAlan Stern 
47517230acdSAlan Stern /*
476dccf4a48SAlan Stern  * Put a QH on the schedule in both hardware and software
4771da177e4SLinus Torvalds  */
478dccf4a48SAlan Stern static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
4791da177e4SLinus Torvalds {
480dccf4a48SAlan Stern 	WARN_ON(list_empty(&qh->queue));
481dccf4a48SAlan Stern 
482dccf4a48SAlan Stern 	/* Set the element pointer if it isn't set already.
483dccf4a48SAlan Stern 	 * This isn't needed for Isochronous queues, but it doesn't hurt. */
484dccf4a48SAlan Stern 	if (qh_element(qh) == UHCI_PTR_TERM) {
485dccf4a48SAlan Stern 		struct urb_priv *urbp = list_entry(qh->queue.next,
486dccf4a48SAlan Stern 				struct urb_priv, node);
487dccf4a48SAlan Stern 		struct uhci_td *td = list_entry(urbp->td_list.next,
488dccf4a48SAlan Stern 				struct uhci_td, list);
489dccf4a48SAlan Stern 
49028b9325eSAlan Stern 		qh->element = LINK_TO_TD(td);
491dccf4a48SAlan Stern 	}
492dccf4a48SAlan Stern 
49384afddd7SAlan Stern 	/* Treat the queue as if it has just advanced */
49484afddd7SAlan Stern 	qh->wait_expired = 0;
49584afddd7SAlan Stern 	qh->advance_jiffies = jiffies;
49684afddd7SAlan Stern 
497dccf4a48SAlan Stern 	if (qh->state == QH_STATE_ACTIVE)
4981da177e4SLinus Torvalds 		return;
499dccf4a48SAlan Stern 	qh->state = QH_STATE_ACTIVE;
500dccf4a48SAlan Stern 
50117230acdSAlan Stern 	/* Move the QH from its old list to the correct spot in the appropriate
502dccf4a48SAlan Stern 	 * skeleton's list */
5030ed8fee1SAlan Stern 	if (qh == uhci->next_qh)
5040ed8fee1SAlan Stern 		uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
5050ed8fee1SAlan Stern 				node);
50617230acdSAlan Stern 	list_del(&qh->node);
507dccf4a48SAlan Stern 
50817230acdSAlan Stern 	if (qh->skel == SKEL_ISO)
50917230acdSAlan Stern 		link_iso(uhci, qh);
51017230acdSAlan Stern 	else if (qh->skel < SKEL_ASYNC)
51117230acdSAlan Stern 		link_interrupt(uhci, qh);
51217230acdSAlan Stern 	else
51317230acdSAlan Stern 		link_async(uhci, qh);
51417230acdSAlan Stern }
51517230acdSAlan Stern 
51617230acdSAlan Stern /*
51717230acdSAlan Stern  * Unlink a high-period interrupt QH from the schedule
51817230acdSAlan Stern  */
51917230acdSAlan Stern static void unlink_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh)
52017230acdSAlan Stern {
52117230acdSAlan Stern 	struct uhci_qh *pqh;
52217230acdSAlan Stern 
523dccf4a48SAlan Stern 	pqh = list_entry(qh->node.prev, struct uhci_qh, node);
52417230acdSAlan Stern 	pqh->link = qh->link;
52517230acdSAlan Stern 	mb();
52617230acdSAlan Stern }
52717230acdSAlan Stern 
52817230acdSAlan Stern /*
52917230acdSAlan Stern  * Unlink a period-1 interrupt or async QH from the schedule
53017230acdSAlan Stern  */
53117230acdSAlan Stern static void unlink_async(struct uhci_hcd *uhci, struct uhci_qh *qh)
53217230acdSAlan Stern {
533e009f1b2SAlan Stern 	struct uhci_qh *pqh;
53417230acdSAlan Stern 	__le32 link_to_next_qh = qh->link;
53517230acdSAlan Stern 
53617230acdSAlan Stern 	pqh = list_entry(qh->node.prev, struct uhci_qh, node);
53717230acdSAlan Stern 	pqh->link = link_to_next_qh;
538e009f1b2SAlan Stern 
539e009f1b2SAlan Stern 	/* If this was the old first FSBR QH, link the terminating skeleton
540e009f1b2SAlan Stern 	 * QH to the next (new first FSBR) QH. */
541e009f1b2SAlan Stern 	if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR)
542e009f1b2SAlan Stern 		uhci->skel_term_qh->link = link_to_next_qh;
54317230acdSAlan Stern 	mb();
544dccf4a48SAlan Stern }
5451da177e4SLinus Torvalds 
5461da177e4SLinus Torvalds /*
547dccf4a48SAlan Stern  * Take a QH off the hardware schedule
5481da177e4SLinus Torvalds  */
549dccf4a48SAlan Stern static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
550dccf4a48SAlan Stern {
551dccf4a48SAlan Stern 	if (qh->state == QH_STATE_UNLINKING)
552dccf4a48SAlan Stern 		return;
553dccf4a48SAlan Stern 	WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev);
554dccf4a48SAlan Stern 	qh->state = QH_STATE_UNLINKING;
5551da177e4SLinus Torvalds 
556dccf4a48SAlan Stern 	/* Unlink the QH from the schedule and record when we did it */
55717230acdSAlan Stern 	if (qh->skel == SKEL_ISO)
55817230acdSAlan Stern 		;
55917230acdSAlan Stern 	else if (qh->skel < SKEL_ASYNC)
56017230acdSAlan Stern 		unlink_interrupt(uhci, qh);
56117230acdSAlan Stern 	else
56217230acdSAlan Stern 		unlink_async(uhci, qh);
5631da177e4SLinus Torvalds 
5641da177e4SLinus Torvalds 	uhci_get_current_frame_number(uhci);
565dccf4a48SAlan Stern 	qh->unlink_frame = uhci->frame_number;
5661da177e4SLinus Torvalds 
567dccf4a48SAlan Stern 	/* Force an interrupt so we know when the QH is fully unlinked */
568dccf4a48SAlan Stern 	if (list_empty(&uhci->skel_unlink_qh->node))
5691da177e4SLinus Torvalds 		uhci_set_next_interrupt(uhci);
5701da177e4SLinus Torvalds 
571dccf4a48SAlan Stern 	/* Move the QH from its old list to the end of the unlinking list */
5720ed8fee1SAlan Stern 	if (qh == uhci->next_qh)
5730ed8fee1SAlan Stern 		uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
5740ed8fee1SAlan Stern 				node);
575dccf4a48SAlan Stern 	list_move_tail(&qh->node, &uhci->skel_unlink_qh->node);
5761da177e4SLinus Torvalds }
5771da177e4SLinus Torvalds 
5781da177e4SLinus Torvalds /*
579dccf4a48SAlan Stern  * When we and the controller are through with a QH, it becomes IDLE.
580dccf4a48SAlan Stern  * This happens when a QH has been off the schedule (on the unlinking
581dccf4a48SAlan Stern  * list) for more than one frame, or when an error occurs while adding
582dccf4a48SAlan Stern  * the first URB onto a new QH.
5831da177e4SLinus Torvalds  */
584dccf4a48SAlan Stern static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh)
585dccf4a48SAlan Stern {
586dccf4a48SAlan Stern 	WARN_ON(qh->state == QH_STATE_ACTIVE);
587dccf4a48SAlan Stern 
5880ed8fee1SAlan Stern 	if (qh == uhci->next_qh)
5890ed8fee1SAlan Stern 		uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
5900ed8fee1SAlan Stern 				node);
591dccf4a48SAlan Stern 	list_move(&qh->node, &uhci->idle_qh_list);
592dccf4a48SAlan Stern 	qh->state = QH_STATE_IDLE;
593dccf4a48SAlan Stern 
59459e29ed9SAlan Stern 	/* Now that the QH is idle, its post_td isn't being used */
59559e29ed9SAlan Stern 	if (qh->post_td) {
59659e29ed9SAlan Stern 		uhci_free_td(uhci, qh->post_td);
59759e29ed9SAlan Stern 		qh->post_td = NULL;
59859e29ed9SAlan Stern 	}
59959e29ed9SAlan Stern 
600dccf4a48SAlan Stern 	/* If anyone is waiting for a QH to become idle, wake them up */
601dccf4a48SAlan Stern 	if (uhci->num_waiting)
602dccf4a48SAlan Stern 		wake_up_all(&uhci->waitqh);
6031da177e4SLinus Torvalds }
6041da177e4SLinus Torvalds 
6053ca2a321SAlan Stern /*
6063ca2a321SAlan Stern  * Find the highest existing bandwidth load for a given phase and period.
6073ca2a321SAlan Stern  */
6083ca2a321SAlan Stern static int uhci_highest_load(struct uhci_hcd *uhci, int phase, int period)
6093ca2a321SAlan Stern {
6103ca2a321SAlan Stern 	int highest_load = uhci->load[phase];
6113ca2a321SAlan Stern 
6123ca2a321SAlan Stern 	for (phase += period; phase < MAX_PHASE; phase += period)
6133ca2a321SAlan Stern 		highest_load = max_t(int, highest_load, uhci->load[phase]);
6143ca2a321SAlan Stern 	return highest_load;
6153ca2a321SAlan Stern }
6163ca2a321SAlan Stern 
6173ca2a321SAlan Stern /*
6183ca2a321SAlan Stern  * Set qh->phase to the optimal phase for a periodic transfer and
6193ca2a321SAlan Stern  * check whether the bandwidth requirement is acceptable.
6203ca2a321SAlan Stern  */
6213ca2a321SAlan Stern static int uhci_check_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh)
6223ca2a321SAlan Stern {
6233ca2a321SAlan Stern 	int minimax_load;
6243ca2a321SAlan Stern 
6253ca2a321SAlan Stern 	/* Find the optimal phase (unless it is already set) and get
6263ca2a321SAlan Stern 	 * its load value. */
6273ca2a321SAlan Stern 	if (qh->phase >= 0)
6283ca2a321SAlan Stern 		minimax_load = uhci_highest_load(uhci, qh->phase, qh->period);
6293ca2a321SAlan Stern 	else {
6303ca2a321SAlan Stern 		int phase, load;
6313ca2a321SAlan Stern 		int max_phase = min_t(int, MAX_PHASE, qh->period);
6323ca2a321SAlan Stern 
6333ca2a321SAlan Stern 		qh->phase = 0;
6343ca2a321SAlan Stern 		minimax_load = uhci_highest_load(uhci, qh->phase, qh->period);
6353ca2a321SAlan Stern 		for (phase = 1; phase < max_phase; ++phase) {
6363ca2a321SAlan Stern 			load = uhci_highest_load(uhci, phase, qh->period);
6373ca2a321SAlan Stern 			if (load < minimax_load) {
6383ca2a321SAlan Stern 				minimax_load = load;
6393ca2a321SAlan Stern 				qh->phase = phase;
6403ca2a321SAlan Stern 			}
6413ca2a321SAlan Stern 		}
6423ca2a321SAlan Stern 	}
6433ca2a321SAlan Stern 
6443ca2a321SAlan Stern 	/* Maximum allowable periodic bandwidth is 90%, or 900 us per frame */
6453ca2a321SAlan Stern 	if (minimax_load + qh->load > 900) {
6463ca2a321SAlan Stern 		dev_dbg(uhci_dev(uhci), "bandwidth allocation failed: "
6473ca2a321SAlan Stern 				"period %d, phase %d, %d + %d us\n",
6483ca2a321SAlan Stern 				qh->period, qh->phase, minimax_load, qh->load);
6493ca2a321SAlan Stern 		return -ENOSPC;
6503ca2a321SAlan Stern 	}
6513ca2a321SAlan Stern 	return 0;
6523ca2a321SAlan Stern }
6533ca2a321SAlan Stern 
6543ca2a321SAlan Stern /*
6553ca2a321SAlan Stern  * Reserve a periodic QH's bandwidth in the schedule
6563ca2a321SAlan Stern  */
6573ca2a321SAlan Stern static void uhci_reserve_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh)
6583ca2a321SAlan Stern {
6593ca2a321SAlan Stern 	int i;
6603ca2a321SAlan Stern 	int load = qh->load;
6613ca2a321SAlan Stern 	char *p = "??";
6623ca2a321SAlan Stern 
6633ca2a321SAlan Stern 	for (i = qh->phase; i < MAX_PHASE; i += qh->period) {
6643ca2a321SAlan Stern 		uhci->load[i] += load;
6653ca2a321SAlan Stern 		uhci->total_load += load;
6663ca2a321SAlan Stern 	}
6673ca2a321SAlan Stern 	uhci_to_hcd(uhci)->self.bandwidth_allocated =
6683ca2a321SAlan Stern 			uhci->total_load / MAX_PHASE;
6693ca2a321SAlan Stern 	switch (qh->type) {
6703ca2a321SAlan Stern 	case USB_ENDPOINT_XFER_INT:
6713ca2a321SAlan Stern 		++uhci_to_hcd(uhci)->self.bandwidth_int_reqs;
6723ca2a321SAlan Stern 		p = "INT";
6733ca2a321SAlan Stern 		break;
6743ca2a321SAlan Stern 	case USB_ENDPOINT_XFER_ISOC:
6753ca2a321SAlan Stern 		++uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs;
6763ca2a321SAlan Stern 		p = "ISO";
6773ca2a321SAlan Stern 		break;
6783ca2a321SAlan Stern 	}
6793ca2a321SAlan Stern 	qh->bandwidth_reserved = 1;
6803ca2a321SAlan Stern 	dev_dbg(uhci_dev(uhci),
6813ca2a321SAlan Stern 			"%s dev %d ep%02x-%s, period %d, phase %d, %d us\n",
6823ca2a321SAlan Stern 			"reserve", qh->udev->devnum,
6833ca2a321SAlan Stern 			qh->hep->desc.bEndpointAddress, p,
6843ca2a321SAlan Stern 			qh->period, qh->phase, load);
6853ca2a321SAlan Stern }
6863ca2a321SAlan Stern 
6873ca2a321SAlan Stern /*
6883ca2a321SAlan Stern  * Release a periodic QH's bandwidth reservation
6893ca2a321SAlan Stern  */
6903ca2a321SAlan Stern static void uhci_release_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh)
6913ca2a321SAlan Stern {
6923ca2a321SAlan Stern 	int i;
6933ca2a321SAlan Stern 	int load = qh->load;
6943ca2a321SAlan Stern 	char *p = "??";
6953ca2a321SAlan Stern 
6963ca2a321SAlan Stern 	for (i = qh->phase; i < MAX_PHASE; i += qh->period) {
6973ca2a321SAlan Stern 		uhci->load[i] -= load;
6983ca2a321SAlan Stern 		uhci->total_load -= load;
6993ca2a321SAlan Stern 	}
7003ca2a321SAlan Stern 	uhci_to_hcd(uhci)->self.bandwidth_allocated =
7013ca2a321SAlan Stern 			uhci->total_load / MAX_PHASE;
7023ca2a321SAlan Stern 	switch (qh->type) {
7033ca2a321SAlan Stern 	case USB_ENDPOINT_XFER_INT:
7043ca2a321SAlan Stern 		--uhci_to_hcd(uhci)->self.bandwidth_int_reqs;
7053ca2a321SAlan Stern 		p = "INT";
7063ca2a321SAlan Stern 		break;
7073ca2a321SAlan Stern 	case USB_ENDPOINT_XFER_ISOC:
7083ca2a321SAlan Stern 		--uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs;
7093ca2a321SAlan Stern 		p = "ISO";
7103ca2a321SAlan Stern 		break;
7113ca2a321SAlan Stern 	}
7123ca2a321SAlan Stern 	qh->bandwidth_reserved = 0;
7133ca2a321SAlan Stern 	dev_dbg(uhci_dev(uhci),
7143ca2a321SAlan Stern 			"%s dev %d ep%02x-%s, period %d, phase %d, %d us\n",
7153ca2a321SAlan Stern 			"release", qh->udev->devnum,
7163ca2a321SAlan Stern 			qh->hep->desc.bEndpointAddress, p,
7173ca2a321SAlan Stern 			qh->period, qh->phase, load);
7183ca2a321SAlan Stern }
7193ca2a321SAlan Stern 
720dccf4a48SAlan Stern static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci,
721dccf4a48SAlan Stern 		struct urb *urb)
7221da177e4SLinus Torvalds {
7231da177e4SLinus Torvalds 	struct urb_priv *urbp;
7241da177e4SLinus Torvalds 
725c3762229SRobert P. J. Day 	urbp = kmem_cache_zalloc(uhci_up_cachep, GFP_ATOMIC);
7261da177e4SLinus Torvalds 	if (!urbp)
7271da177e4SLinus Torvalds 		return NULL;
7281da177e4SLinus Torvalds 
7291da177e4SLinus Torvalds 	urbp->urb = urb;
7301da177e4SLinus Torvalds 	urb->hcpriv = urbp;
731dccf4a48SAlan Stern 
732dccf4a48SAlan Stern 	INIT_LIST_HEAD(&urbp->node);
733dccf4a48SAlan Stern 	INIT_LIST_HEAD(&urbp->td_list);
7341da177e4SLinus Torvalds 
7351da177e4SLinus Torvalds 	return urbp;
7361da177e4SLinus Torvalds }
7371da177e4SLinus Torvalds 
738dccf4a48SAlan Stern static void uhci_free_urb_priv(struct uhci_hcd *uhci,
739dccf4a48SAlan Stern 		struct urb_priv *urbp)
7401da177e4SLinus Torvalds {
7411da177e4SLinus Torvalds 	struct uhci_td *td, *tmp;
7421da177e4SLinus Torvalds 
743*5172046dSArjan van de Ven 	if (!list_empty(&urbp->node))
744*5172046dSArjan van de Ven 		dev_WARN(uhci_dev(uhci), "urb %p still on QH's list!\n",
745dccf4a48SAlan Stern 				urbp->urb);
7461da177e4SLinus Torvalds 
7471da177e4SLinus Torvalds 	list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
74804538a25SAlan Stern 		uhci_remove_td_from_urbp(td);
74904538a25SAlan Stern 		uhci_free_td(uhci, td);
7501da177e4SLinus Torvalds 	}
7511da177e4SLinus Torvalds 
7521da177e4SLinus Torvalds 	kmem_cache_free(uhci_up_cachep, urbp);
7531da177e4SLinus Torvalds }
7541da177e4SLinus Torvalds 
7551da177e4SLinus Torvalds /*
7561da177e4SLinus Torvalds  * Map status to standard result codes
7571da177e4SLinus Torvalds  *
7581da177e4SLinus Torvalds  * <status> is (td_status(td) & 0xF60000), a.k.a.
7591da177e4SLinus Torvalds  * uhci_status_bits(td_status(td)).
7601da177e4SLinus Torvalds  * Note: <status> does not include the TD_CTRL_NAK bit.
7611da177e4SLinus Torvalds  * <dir_out> is True for output TDs and False for input TDs.
7621da177e4SLinus Torvalds  */
7631da177e4SLinus Torvalds static int uhci_map_status(int status, int dir_out)
7641da177e4SLinus Torvalds {
7651da177e4SLinus Torvalds 	if (!status)
7661da177e4SLinus Torvalds 		return 0;
7671da177e4SLinus Torvalds 	if (status & TD_CTRL_BITSTUFF)			/* Bitstuff error */
7681da177e4SLinus Torvalds 		return -EPROTO;
7691da177e4SLinus Torvalds 	if (status & TD_CTRL_CRCTIMEO) {		/* CRC/Timeout */
7701da177e4SLinus Torvalds 		if (dir_out)
7711da177e4SLinus Torvalds 			return -EPROTO;
7721da177e4SLinus Torvalds 		else
7731da177e4SLinus Torvalds 			return -EILSEQ;
7741da177e4SLinus Torvalds 	}
7751da177e4SLinus Torvalds 	if (status & TD_CTRL_BABBLE)			/* Babble */
7761da177e4SLinus Torvalds 		return -EOVERFLOW;
7771da177e4SLinus Torvalds 	if (status & TD_CTRL_DBUFERR)			/* Buffer error */
7781da177e4SLinus Torvalds 		return -ENOSR;
7791da177e4SLinus Torvalds 	if (status & TD_CTRL_STALLED)			/* Stalled */
7801da177e4SLinus Torvalds 		return -EPIPE;
7811da177e4SLinus Torvalds 	return 0;
7821da177e4SLinus Torvalds }
7831da177e4SLinus Torvalds 
7841da177e4SLinus Torvalds /*
7851da177e4SLinus Torvalds  * Control transfers
7861da177e4SLinus Torvalds  */
787dccf4a48SAlan Stern static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
788dccf4a48SAlan Stern 		struct uhci_qh *qh)
7891da177e4SLinus Torvalds {
7901da177e4SLinus Torvalds 	struct uhci_td *td;
7911da177e4SLinus Torvalds 	unsigned long destination, status;
792dccf4a48SAlan Stern 	int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
7931da177e4SLinus Torvalds 	int len = urb->transfer_buffer_length;
7941da177e4SLinus Torvalds 	dma_addr_t data = urb->transfer_dma;
795dccf4a48SAlan Stern 	__le32 *plink;
79604538a25SAlan Stern 	struct urb_priv *urbp = urb->hcpriv;
79717230acdSAlan Stern 	int skel;
7981da177e4SLinus Torvalds 
7991da177e4SLinus Torvalds 	/* The "pipe" thing contains the destination in bits 8--18 */
8001da177e4SLinus Torvalds 	destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
8011da177e4SLinus Torvalds 
802af0bb599SAlan Stern 	/* 3 errors, dummy TD remains inactive */
803af0bb599SAlan Stern 	status = uhci_maxerr(3);
8041da177e4SLinus Torvalds 	if (urb->dev->speed == USB_SPEED_LOW)
8051da177e4SLinus Torvalds 		status |= TD_CTRL_LS;
8061da177e4SLinus Torvalds 
8071da177e4SLinus Torvalds 	/*
8081da177e4SLinus Torvalds 	 * Build the TD for the control request setup packet
8091da177e4SLinus Torvalds 	 */
810af0bb599SAlan Stern 	td = qh->dummy_td;
81104538a25SAlan Stern 	uhci_add_td_to_urbp(td, urbp);
812fa346568SAlan Stern 	uhci_fill_td(td, status, destination | uhci_explen(8),
8131da177e4SLinus Torvalds 			urb->setup_dma);
814dccf4a48SAlan Stern 	plink = &td->link;
815af0bb599SAlan Stern 	status |= TD_CTRL_ACTIVE;
8161da177e4SLinus Torvalds 
8171da177e4SLinus Torvalds 	/*
8181da177e4SLinus Torvalds 	 * If direction is "send", change the packet ID from SETUP (0x2D)
8191da177e4SLinus Torvalds 	 * to OUT (0xE1).  Else change it from SETUP to IN (0x69) and
8201da177e4SLinus Torvalds 	 * set Short Packet Detect (SPD) for all data packets.
821e7e7c360SAlan Stern 	 *
822e7e7c360SAlan Stern 	 * 0-length transfers always get treated as "send".
8231da177e4SLinus Torvalds 	 */
824e7e7c360SAlan Stern 	if (usb_pipeout(urb->pipe) || len == 0)
8251da177e4SLinus Torvalds 		destination ^= (USB_PID_SETUP ^ USB_PID_OUT);
8261da177e4SLinus Torvalds 	else {
8271da177e4SLinus Torvalds 		destination ^= (USB_PID_SETUP ^ USB_PID_IN);
8281da177e4SLinus Torvalds 		status |= TD_CTRL_SPD;
8291da177e4SLinus Torvalds 	}
8301da177e4SLinus Torvalds 
8311da177e4SLinus Torvalds 	/*
832687f5f34SAlan Stern 	 * Build the DATA TDs
8331da177e4SLinus Torvalds 	 */
8341da177e4SLinus Torvalds 	while (len > 0) {
835e7e7c360SAlan Stern 		int pktsze = maxsze;
836e7e7c360SAlan Stern 
837e7e7c360SAlan Stern 		if (len <= pktsze) {		/* The last data packet */
838e7e7c360SAlan Stern 			pktsze = len;
839e7e7c360SAlan Stern 			status &= ~TD_CTRL_SPD;
840e7e7c360SAlan Stern 		}
8411da177e4SLinus Torvalds 
8422532178aSAlan Stern 		td = uhci_alloc_td(uhci);
8431da177e4SLinus Torvalds 		if (!td)
844af0bb599SAlan Stern 			goto nomem;
84528b9325eSAlan Stern 		*plink = LINK_TO_TD(td);
8461da177e4SLinus Torvalds 
8471da177e4SLinus Torvalds 		/* Alternate Data0/1 (start with Data1) */
8481da177e4SLinus Torvalds 		destination ^= TD_TOKEN_TOGGLE;
8491da177e4SLinus Torvalds 
85004538a25SAlan Stern 		uhci_add_td_to_urbp(td, urbp);
851fa346568SAlan Stern 		uhci_fill_td(td, status, destination | uhci_explen(pktsze),
8521da177e4SLinus Torvalds 				data);
853dccf4a48SAlan Stern 		plink = &td->link;
8541da177e4SLinus Torvalds 
8551da177e4SLinus Torvalds 		data += pktsze;
8561da177e4SLinus Torvalds 		len -= pktsze;
8571da177e4SLinus Torvalds 	}
8581da177e4SLinus Torvalds 
8591da177e4SLinus Torvalds 	/*
8601da177e4SLinus Torvalds 	 * Build the final TD for control status
8611da177e4SLinus Torvalds 	 */
8622532178aSAlan Stern 	td = uhci_alloc_td(uhci);
8631da177e4SLinus Torvalds 	if (!td)
864af0bb599SAlan Stern 		goto nomem;
86528b9325eSAlan Stern 	*plink = LINK_TO_TD(td);
8661da177e4SLinus Torvalds 
867e7e7c360SAlan Stern 	/* Change direction for the status transaction */
868e7e7c360SAlan Stern 	destination ^= (USB_PID_IN ^ USB_PID_OUT);
8691da177e4SLinus Torvalds 	destination |= TD_TOKEN_TOGGLE;		/* End in Data1 */
8701da177e4SLinus Torvalds 
87104538a25SAlan Stern 	uhci_add_td_to_urbp(td, urbp);
8721da177e4SLinus Torvalds 	uhci_fill_td(td, status | TD_CTRL_IOC,
873fa346568SAlan Stern 			destination | uhci_explen(0), 0);
874af0bb599SAlan Stern 	plink = &td->link;
875af0bb599SAlan Stern 
876af0bb599SAlan Stern 	/*
877af0bb599SAlan Stern 	 * Build the new dummy TD and activate the old one
878af0bb599SAlan Stern 	 */
879af0bb599SAlan Stern 	td = uhci_alloc_td(uhci);
880af0bb599SAlan Stern 	if (!td)
881af0bb599SAlan Stern 		goto nomem;
88228b9325eSAlan Stern 	*plink = LINK_TO_TD(td);
883af0bb599SAlan Stern 
884af0bb599SAlan Stern 	uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
885af0bb599SAlan Stern 	wmb();
886af0bb599SAlan Stern 	qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
887af0bb599SAlan Stern 	qh->dummy_td = td;
8881da177e4SLinus Torvalds 
8891da177e4SLinus Torvalds 	/* Low-speed transfers get a different queue, and won't hog the bus.
8901da177e4SLinus Torvalds 	 * Also, some devices enumerate better without FSBR; the easiest way
8911da177e4SLinus Torvalds 	 * to do that is to put URBs on the low-speed queue while the device
892630aa3cfSAlan Stern 	 * isn't in the CONFIGURED state. */
8931da177e4SLinus Torvalds 	if (urb->dev->speed == USB_SPEED_LOW ||
894630aa3cfSAlan Stern 			urb->dev->state != USB_STATE_CONFIGURED)
89517230acdSAlan Stern 		skel = SKEL_LS_CONTROL;
8961da177e4SLinus Torvalds 	else {
89717230acdSAlan Stern 		skel = SKEL_FS_CONTROL;
89884afddd7SAlan Stern 		uhci_add_fsbr(uhci, urb);
8991da177e4SLinus Torvalds 	}
90017230acdSAlan Stern 	if (qh->state != QH_STATE_ACTIVE)
90117230acdSAlan Stern 		qh->skel = skel;
90259e29ed9SAlan Stern 
90359e29ed9SAlan Stern 	urb->actual_length = -8;	/* Account for the SETUP packet */
904dccf4a48SAlan Stern 	return 0;
905af0bb599SAlan Stern 
906af0bb599SAlan Stern nomem:
907af0bb599SAlan Stern 	/* Remove the dummy TD from the td_list so it doesn't get freed */
90804538a25SAlan Stern 	uhci_remove_td_from_urbp(qh->dummy_td);
909af0bb599SAlan Stern 	return -ENOMEM;
9101da177e4SLinus Torvalds }
9111da177e4SLinus Torvalds 
9121da177e4SLinus Torvalds /*
9131da177e4SLinus Torvalds  * Common submit for bulk and interrupt
9141da177e4SLinus Torvalds  */
915dccf4a48SAlan Stern static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
916dccf4a48SAlan Stern 		struct uhci_qh *qh)
9171da177e4SLinus Torvalds {
9181da177e4SLinus Torvalds 	struct uhci_td *td;
9191da177e4SLinus Torvalds 	unsigned long destination, status;
920dccf4a48SAlan Stern 	int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
9211da177e4SLinus Torvalds 	int len = urb->transfer_buffer_length;
9221da177e4SLinus Torvalds 	dma_addr_t data = urb->transfer_dma;
923af0bb599SAlan Stern 	__le32 *plink;
92404538a25SAlan Stern 	struct urb_priv *urbp = urb->hcpriv;
925af0bb599SAlan Stern 	unsigned int toggle;
9261da177e4SLinus Torvalds 
9271da177e4SLinus Torvalds 	if (len < 0)
9281da177e4SLinus Torvalds 		return -EINVAL;
9291da177e4SLinus Torvalds 
9301da177e4SLinus Torvalds 	/* The "pipe" thing contains the destination in bits 8--18 */
9311da177e4SLinus Torvalds 	destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
932af0bb599SAlan Stern 	toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
933af0bb599SAlan Stern 			 usb_pipeout(urb->pipe));
9341da177e4SLinus Torvalds 
935af0bb599SAlan Stern 	/* 3 errors, dummy TD remains inactive */
936af0bb599SAlan Stern 	status = uhci_maxerr(3);
9371da177e4SLinus Torvalds 	if (urb->dev->speed == USB_SPEED_LOW)
9381da177e4SLinus Torvalds 		status |= TD_CTRL_LS;
9391da177e4SLinus Torvalds 	if (usb_pipein(urb->pipe))
9401da177e4SLinus Torvalds 		status |= TD_CTRL_SPD;
9411da177e4SLinus Torvalds 
9421da177e4SLinus Torvalds 	/*
943687f5f34SAlan Stern 	 * Build the DATA TDs
9441da177e4SLinus Torvalds 	 */
945af0bb599SAlan Stern 	plink = NULL;
946af0bb599SAlan Stern 	td = qh->dummy_td;
9471da177e4SLinus Torvalds 	do {	/* Allow zero length packets */
9481da177e4SLinus Torvalds 		int pktsze = maxsze;
9491da177e4SLinus Torvalds 
950dccf4a48SAlan Stern 		if (len <= pktsze) {		/* The last packet */
9511da177e4SLinus Torvalds 			pktsze = len;
9521da177e4SLinus Torvalds 			if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
9531da177e4SLinus Torvalds 				status &= ~TD_CTRL_SPD;
9541da177e4SLinus Torvalds 		}
9551da177e4SLinus Torvalds 
956af0bb599SAlan Stern 		if (plink) {
9572532178aSAlan Stern 			td = uhci_alloc_td(uhci);
9581da177e4SLinus Torvalds 			if (!td)
959af0bb599SAlan Stern 				goto nomem;
96028b9325eSAlan Stern 			*plink = LINK_TO_TD(td);
961af0bb599SAlan Stern 		}
96204538a25SAlan Stern 		uhci_add_td_to_urbp(td, urbp);
963dccf4a48SAlan Stern 		uhci_fill_td(td, status,
964dccf4a48SAlan Stern 				destination | uhci_explen(pktsze) |
965af0bb599SAlan Stern 					(toggle << TD_TOKEN_TOGGLE_SHIFT),
9661da177e4SLinus Torvalds 				data);
967dccf4a48SAlan Stern 		plink = &td->link;
968af0bb599SAlan Stern 		status |= TD_CTRL_ACTIVE;
9691da177e4SLinus Torvalds 
9701da177e4SLinus Torvalds 		data += pktsze;
9711da177e4SLinus Torvalds 		len -= maxsze;
972af0bb599SAlan Stern 		toggle ^= 1;
9731da177e4SLinus Torvalds 	} while (len > 0);
9741da177e4SLinus Torvalds 
9751da177e4SLinus Torvalds 	/*
9761da177e4SLinus Torvalds 	 * URB_ZERO_PACKET means adding a 0-length packet, if direction
9771da177e4SLinus Torvalds 	 * is OUT and the transfer_length was an exact multiple of maxsze,
9781da177e4SLinus Torvalds 	 * hence (len = transfer_length - N * maxsze) == 0
9791da177e4SLinus Torvalds 	 * however, if transfer_length == 0, the zero packet was already
9801da177e4SLinus Torvalds 	 * prepared above.
9811da177e4SLinus Torvalds 	 */
982dccf4a48SAlan Stern 	if ((urb->transfer_flags & URB_ZERO_PACKET) &&
983dccf4a48SAlan Stern 			usb_pipeout(urb->pipe) && len == 0 &&
984dccf4a48SAlan Stern 			urb->transfer_buffer_length > 0) {
9852532178aSAlan Stern 		td = uhci_alloc_td(uhci);
9861da177e4SLinus Torvalds 		if (!td)
987af0bb599SAlan Stern 			goto nomem;
98828b9325eSAlan Stern 		*plink = LINK_TO_TD(td);
9891da177e4SLinus Torvalds 
99004538a25SAlan Stern 		uhci_add_td_to_urbp(td, urbp);
991af0bb599SAlan Stern 		uhci_fill_td(td, status,
992af0bb599SAlan Stern 				destination | uhci_explen(0) |
993af0bb599SAlan Stern 					(toggle << TD_TOKEN_TOGGLE_SHIFT),
9941da177e4SLinus Torvalds 				data);
995af0bb599SAlan Stern 		plink = &td->link;
9961da177e4SLinus Torvalds 
997af0bb599SAlan Stern 		toggle ^= 1;
9981da177e4SLinus Torvalds 	}
9991da177e4SLinus Torvalds 
10001da177e4SLinus Torvalds 	/* Set the interrupt-on-completion flag on the last packet.
10011da177e4SLinus Torvalds 	 * A more-or-less typical 4 KB URB (= size of one memory page)
10021da177e4SLinus Torvalds 	 * will require about 3 ms to transfer; that's a little on the
10031da177e4SLinus Torvalds 	 * fast side but not enough to justify delaying an interrupt
10041da177e4SLinus Torvalds 	 * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
10051da177e4SLinus Torvalds 	 * flag setting. */
1006dccf4a48SAlan Stern 	td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
10071da177e4SLinus Torvalds 
1008af0bb599SAlan Stern 	/*
1009af0bb599SAlan Stern 	 * Build the new dummy TD and activate the old one
1010af0bb599SAlan Stern 	 */
1011af0bb599SAlan Stern 	td = uhci_alloc_td(uhci);
1012af0bb599SAlan Stern 	if (!td)
1013af0bb599SAlan Stern 		goto nomem;
101428b9325eSAlan Stern 	*plink = LINK_TO_TD(td);
1015af0bb599SAlan Stern 
1016af0bb599SAlan Stern 	uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
1017af0bb599SAlan Stern 	wmb();
1018af0bb599SAlan Stern 	qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
1019af0bb599SAlan Stern 	qh->dummy_td = td;
1020af0bb599SAlan Stern 
1021af0bb599SAlan Stern 	usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1022af0bb599SAlan Stern 			usb_pipeout(urb->pipe), toggle);
1023dccf4a48SAlan Stern 	return 0;
1024af0bb599SAlan Stern 
1025af0bb599SAlan Stern nomem:
1026af0bb599SAlan Stern 	/* Remove the dummy TD from the td_list so it doesn't get freed */
102704538a25SAlan Stern 	uhci_remove_td_from_urbp(qh->dummy_td);
1028af0bb599SAlan Stern 	return -ENOMEM;
10291da177e4SLinus Torvalds }
10301da177e4SLinus Torvalds 
103117230acdSAlan Stern static int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb,
1032dccf4a48SAlan Stern 		struct uhci_qh *qh)
10331da177e4SLinus Torvalds {
10341da177e4SLinus Torvalds 	int ret;
10351da177e4SLinus Torvalds 
10361da177e4SLinus Torvalds 	/* Can't have low-speed bulk transfers */
10371da177e4SLinus Torvalds 	if (urb->dev->speed == USB_SPEED_LOW)
10381da177e4SLinus Torvalds 		return -EINVAL;
10391da177e4SLinus Torvalds 
104017230acdSAlan Stern 	if (qh->state != QH_STATE_ACTIVE)
104117230acdSAlan Stern 		qh->skel = SKEL_BULK;
1042dccf4a48SAlan Stern 	ret = uhci_submit_common(uhci, urb, qh);
1043dccf4a48SAlan Stern 	if (ret == 0)
104484afddd7SAlan Stern 		uhci_add_fsbr(uhci, urb);
10451da177e4SLinus Torvalds 	return ret;
10461da177e4SLinus Torvalds }
10471da177e4SLinus Torvalds 
1048caf3827aSAlan Stern static int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb,
1049dccf4a48SAlan Stern 		struct uhci_qh *qh)
10501da177e4SLinus Torvalds {
10513ca2a321SAlan Stern 	int ret;
1052caf3827aSAlan Stern 
1053dccf4a48SAlan Stern 	/* USB 1.1 interrupt transfers only involve one packet per interval.
1054dccf4a48SAlan Stern 	 * Drivers can submit URBs of any length, but longer ones will need
1055dccf4a48SAlan Stern 	 * multiple intervals to complete.
10561da177e4SLinus Torvalds 	 */
1057caf3827aSAlan Stern 
10583ca2a321SAlan Stern 	if (!qh->bandwidth_reserved) {
10593ca2a321SAlan Stern 		int exponent;
10603ca2a321SAlan Stern 
1061caf3827aSAlan Stern 		/* Figure out which power-of-two queue to use */
1062caf3827aSAlan Stern 		for (exponent = 7; exponent >= 0; --exponent) {
1063caf3827aSAlan Stern 			if ((1 << exponent) <= urb->interval)
1064caf3827aSAlan Stern 				break;
1065caf3827aSAlan Stern 		}
1066caf3827aSAlan Stern 		if (exponent < 0)
1067caf3827aSAlan Stern 			return -EINVAL;
10683ca2a321SAlan Stern 		qh->period = 1 << exponent;
106917230acdSAlan Stern 		qh->skel = SKEL_INDEX(exponent);
1070caf3827aSAlan Stern 
10713ca2a321SAlan Stern 		/* For now, interrupt phase is fixed by the layout
10723ca2a321SAlan Stern 		 * of the QH lists. */
10733ca2a321SAlan Stern 		qh->phase = (qh->period / 2) & (MAX_PHASE - 1);
10743ca2a321SAlan Stern 		ret = uhci_check_bandwidth(uhci, qh);
10753ca2a321SAlan Stern 		if (ret)
10763ca2a321SAlan Stern 			return ret;
10773ca2a321SAlan Stern 	} else if (qh->period > urb->interval)
10783ca2a321SAlan Stern 		return -EINVAL;		/* Can't decrease the period */
10793ca2a321SAlan Stern 
10803ca2a321SAlan Stern 	ret = uhci_submit_common(uhci, urb, qh);
10813ca2a321SAlan Stern 	if (ret == 0) {
10823ca2a321SAlan Stern 		urb->interval = qh->period;
10833ca2a321SAlan Stern 		if (!qh->bandwidth_reserved)
10843ca2a321SAlan Stern 			uhci_reserve_bandwidth(uhci, qh);
10853ca2a321SAlan Stern 	}
10863ca2a321SAlan Stern 	return ret;
10871da177e4SLinus Torvalds }
10881da177e4SLinus Torvalds 
10891da177e4SLinus Torvalds /*
1090b1869000SAlan Stern  * Fix up the data structures following a short transfer
1091b1869000SAlan Stern  */
1092b1869000SAlan Stern static int uhci_fixup_short_transfer(struct uhci_hcd *uhci,
109359e29ed9SAlan Stern 		struct uhci_qh *qh, struct urb_priv *urbp)
1094b1869000SAlan Stern {
1095b1869000SAlan Stern 	struct uhci_td *td;
109659e29ed9SAlan Stern 	struct list_head *tmp;
109759e29ed9SAlan Stern 	int ret;
1098b1869000SAlan Stern 
1099b1869000SAlan Stern 	td = list_entry(urbp->td_list.prev, struct uhci_td, list);
1100b1869000SAlan Stern 	if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1101b1869000SAlan Stern 
1102b1869000SAlan Stern 		/* When a control transfer is short, we have to restart
1103b1869000SAlan Stern 		 * the queue at the status stage transaction, which is
1104b1869000SAlan Stern 		 * the last TD. */
110559e29ed9SAlan Stern 		WARN_ON(list_empty(&urbp->td_list));
110628b9325eSAlan Stern 		qh->element = LINK_TO_TD(td);
110759e29ed9SAlan Stern 		tmp = td->list.prev;
1108b1869000SAlan Stern 		ret = -EINPROGRESS;
1109b1869000SAlan Stern 
111059e29ed9SAlan Stern 	} else {
1111b1869000SAlan Stern 
1112b1869000SAlan Stern 		/* When a bulk/interrupt transfer is short, we have to
1113b1869000SAlan Stern 		 * fix up the toggles of the following URBs on the queue
1114b1869000SAlan Stern 		 * before restarting the queue at the next URB. */
111559e29ed9SAlan Stern 		qh->initial_toggle = uhci_toggle(td_token(qh->post_td)) ^ 1;
1116b1869000SAlan Stern 		uhci_fixup_toggles(qh, 1);
1117b1869000SAlan Stern 
111859e29ed9SAlan Stern 		if (list_empty(&urbp->td_list))
111959e29ed9SAlan Stern 			td = qh->post_td;
1120b1869000SAlan Stern 		qh->element = td->link;
112159e29ed9SAlan Stern 		tmp = urbp->td_list.prev;
112259e29ed9SAlan Stern 		ret = 0;
1123b1869000SAlan Stern 	}
1124b1869000SAlan Stern 
112559e29ed9SAlan Stern 	/* Remove all the TDs we skipped over, from tmp back to the start */
112659e29ed9SAlan Stern 	while (tmp != &urbp->td_list) {
112759e29ed9SAlan Stern 		td = list_entry(tmp, struct uhci_td, list);
112859e29ed9SAlan Stern 		tmp = tmp->prev;
112959e29ed9SAlan Stern 
113004538a25SAlan Stern 		uhci_remove_td_from_urbp(td);
113104538a25SAlan Stern 		uhci_free_td(uhci, td);
113259e29ed9SAlan Stern 	}
1133b1869000SAlan Stern 	return ret;
1134b1869000SAlan Stern }
1135b1869000SAlan Stern 
1136b1869000SAlan Stern /*
1137b1869000SAlan Stern  * Common result for control, bulk, and interrupt
1138b1869000SAlan Stern  */
1139b1869000SAlan Stern static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
1140b1869000SAlan Stern {
1141b1869000SAlan Stern 	struct urb_priv *urbp = urb->hcpriv;
1142b1869000SAlan Stern 	struct uhci_qh *qh = urbp->qh;
114359e29ed9SAlan Stern 	struct uhci_td *td, *tmp;
1144b1869000SAlan Stern 	unsigned status;
1145b1869000SAlan Stern 	int ret = 0;
1146b1869000SAlan Stern 
114759e29ed9SAlan Stern 	list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
1148b1869000SAlan Stern 		unsigned int ctrlstat;
1149b1869000SAlan Stern 		int len;
1150b1869000SAlan Stern 
1151b1869000SAlan Stern 		ctrlstat = td_status(td);
1152b1869000SAlan Stern 		status = uhci_status_bits(ctrlstat);
1153b1869000SAlan Stern 		if (status & TD_CTRL_ACTIVE)
1154b1869000SAlan Stern 			return -EINPROGRESS;
1155b1869000SAlan Stern 
1156b1869000SAlan Stern 		len = uhci_actual_length(ctrlstat);
1157b1869000SAlan Stern 		urb->actual_length += len;
1158b1869000SAlan Stern 
1159b1869000SAlan Stern 		if (status) {
1160b1869000SAlan Stern 			ret = uhci_map_status(status,
1161b1869000SAlan Stern 					uhci_packetout(td_token(td)));
1162b1869000SAlan Stern 			if ((debug == 1 && ret != -EPIPE) || debug > 1) {
1163b1869000SAlan Stern 				/* Some debugging code */
1164be3cbc5fSDavid Brownell 				dev_dbg(&urb->dev->dev,
1165b1869000SAlan Stern 						"%s: failed with status %x\n",
1166441b62c1SHarvey Harrison 						__func__, status);
1167b1869000SAlan Stern 
1168b1869000SAlan Stern 				if (debug > 1 && errbuf) {
1169b1869000SAlan Stern 					/* Print the chain for debugging */
1170e009f1b2SAlan Stern 					uhci_show_qh(uhci, urbp->qh, errbuf,
1171b1869000SAlan Stern 							ERRBUF_LEN, 0);
1172b1869000SAlan Stern 					lprintk(errbuf);
1173b1869000SAlan Stern 				}
1174b1869000SAlan Stern 			}
1175b1869000SAlan Stern 
1176e7e7c360SAlan Stern 		/* Did we receive a short packet? */
1177b1869000SAlan Stern 		} else if (len < uhci_expected_length(td_token(td))) {
1178b1869000SAlan Stern 
1179e7e7c360SAlan Stern 			/* For control transfers, go to the status TD if
1180e7e7c360SAlan Stern 			 * this isn't already the last data TD */
1181e7e7c360SAlan Stern 			if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1182e7e7c360SAlan Stern 				if (td->list.next != urbp->td_list.prev)
1183e7e7c360SAlan Stern 					ret = 1;
1184e7e7c360SAlan Stern 			}
1185e7e7c360SAlan Stern 
1186e7e7c360SAlan Stern 			/* For bulk and interrupt, this may be an error */
1187e7e7c360SAlan Stern 			else if (urb->transfer_flags & URB_SHORT_NOT_OK)
1188b1869000SAlan Stern 				ret = -EREMOTEIO;
1189f443ddf1SAlan Stern 
1190f443ddf1SAlan Stern 			/* Fixup needed only if this isn't the URB's last TD */
1191f443ddf1SAlan Stern 			else if (&td->list != urbp->td_list.prev)
1192b1869000SAlan Stern 				ret = 1;
1193b1869000SAlan Stern 		}
1194b1869000SAlan Stern 
119504538a25SAlan Stern 		uhci_remove_td_from_urbp(td);
119659e29ed9SAlan Stern 		if (qh->post_td)
119704538a25SAlan Stern 			uhci_free_td(uhci, qh->post_td);
119859e29ed9SAlan Stern 		qh->post_td = td;
119959e29ed9SAlan Stern 
1200b1869000SAlan Stern 		if (ret != 0)
1201b1869000SAlan Stern 			goto err;
1202b1869000SAlan Stern 	}
1203b1869000SAlan Stern 	return ret;
1204b1869000SAlan Stern 
1205b1869000SAlan Stern err:
1206b1869000SAlan Stern 	if (ret < 0) {
1207b1869000SAlan Stern 		/* Note that the queue has stopped and save
1208b1869000SAlan Stern 		 * the next toggle value */
1209b1869000SAlan Stern 		qh->element = UHCI_PTR_TERM;
1210b1869000SAlan Stern 		qh->is_stopped = 1;
1211b1869000SAlan Stern 		qh->needs_fixup = (qh->type != USB_ENDPOINT_XFER_CONTROL);
1212b1869000SAlan Stern 		qh->initial_toggle = uhci_toggle(td_token(td)) ^
1213b1869000SAlan Stern 				(ret == -EREMOTEIO);
1214b1869000SAlan Stern 
1215b1869000SAlan Stern 	} else		/* Short packet received */
121659e29ed9SAlan Stern 		ret = uhci_fixup_short_transfer(uhci, qh, urbp);
1217b1869000SAlan Stern 	return ret;
1218b1869000SAlan Stern }
1219b1869000SAlan Stern 
1220b1869000SAlan Stern /*
12211da177e4SLinus Torvalds  * Isochronous transfers
12221da177e4SLinus Torvalds  */
1223dccf4a48SAlan Stern static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb,
1224dccf4a48SAlan Stern 		struct uhci_qh *qh)
12251da177e4SLinus Torvalds {
1226dccf4a48SAlan Stern 	struct uhci_td *td = NULL;	/* Since urb->number_of_packets > 0 */
12270ed8fee1SAlan Stern 	int i, frame;
1228dccf4a48SAlan Stern 	unsigned long destination, status;
1229b81d3436SAlan Stern 	struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
12301da177e4SLinus Torvalds 
1231caf3827aSAlan Stern 	/* Values must not be too big (could overflow below) */
1232caf3827aSAlan Stern 	if (urb->interval >= UHCI_NUMFRAMES ||
1233caf3827aSAlan Stern 			urb->number_of_packets >= UHCI_NUMFRAMES)
1234caf3827aSAlan Stern 		return -EFBIG;
1235caf3827aSAlan Stern 
1236caf3827aSAlan Stern 	/* Check the period and figure out the starting frame number */
12373ca2a321SAlan Stern 	if (!qh->bandwidth_reserved) {
12383ca2a321SAlan Stern 		qh->period = urb->interval;
1239caf3827aSAlan Stern 		if (urb->transfer_flags & URB_ISO_ASAP) {
12403ca2a321SAlan Stern 			qh->phase = -1;		/* Find the best phase */
12413ca2a321SAlan Stern 			i = uhci_check_bandwidth(uhci, qh);
12423ca2a321SAlan Stern 			if (i)
12433ca2a321SAlan Stern 				return i;
12443ca2a321SAlan Stern 
12453ca2a321SAlan Stern 			/* Allow a little time to allocate the TDs */
1246c8155cc5SAlan Stern 			uhci_get_current_frame_number(uhci);
12473ca2a321SAlan Stern 			frame = uhci->frame_number + 10;
12483ca2a321SAlan Stern 
12493ca2a321SAlan Stern 			/* Move forward to the first frame having the
12503ca2a321SAlan Stern 			 * correct phase */
12513ca2a321SAlan Stern 			urb->start_frame = frame + ((qh->phase - frame) &
12523ca2a321SAlan Stern 					(qh->period - 1));
1253caf3827aSAlan Stern 		} else {
1254c8155cc5SAlan Stern 			i = urb->start_frame - uhci->last_iso_frame;
1255caf3827aSAlan Stern 			if (i <= 0 || i >= UHCI_NUMFRAMES)
1256caf3827aSAlan Stern 				return -EINVAL;
12573ca2a321SAlan Stern 			qh->phase = urb->start_frame & (qh->period - 1);
12583ca2a321SAlan Stern 			i = uhci_check_bandwidth(uhci, qh);
12593ca2a321SAlan Stern 			if (i)
12603ca2a321SAlan Stern 				return i;
1261caf3827aSAlan Stern 		}
12623ca2a321SAlan Stern 
1263caf3827aSAlan Stern 	} else if (qh->period != urb->interval) {
1264caf3827aSAlan Stern 		return -EINVAL;		/* Can't change the period */
1265caf3827aSAlan Stern 
12667898ffc5SAlan Stern 	} else {
12677898ffc5SAlan Stern 		/* Find the next unused frame */
1268caf3827aSAlan Stern 		if (list_empty(&qh->queue)) {
1269c8155cc5SAlan Stern 			frame = qh->iso_frame;
1270caf3827aSAlan Stern 		} else {
1271caf3827aSAlan Stern 			struct urb *lurb;
1272caf3827aSAlan Stern 
1273caf3827aSAlan Stern 			lurb = list_entry(qh->queue.prev,
1274caf3827aSAlan Stern 					struct urb_priv, node)->urb;
1275caf3827aSAlan Stern 			frame = lurb->start_frame +
1276caf3827aSAlan Stern 					lurb->number_of_packets *
1277caf3827aSAlan Stern 					lurb->interval;
1278caf3827aSAlan Stern 		}
12797898ffc5SAlan Stern 		if (urb->transfer_flags & URB_ISO_ASAP) {
12807898ffc5SAlan Stern 			/* Skip some frames if necessary to insure
12817898ffc5SAlan Stern 			 * the start frame is in the future.
12827898ffc5SAlan Stern 			 */
12837898ffc5SAlan Stern 			uhci_get_current_frame_number(uhci);
12847898ffc5SAlan Stern 			if (uhci_frame_before_eq(frame, uhci->frame_number)) {
12857898ffc5SAlan Stern 				frame = uhci->frame_number + 1;
12867898ffc5SAlan Stern 				frame += ((qh->phase - frame) &
12877898ffc5SAlan Stern 					(qh->period - 1));
12887898ffc5SAlan Stern 			}
12897898ffc5SAlan Stern 		}	/* Otherwise pick up where the last URB leaves off */
1290caf3827aSAlan Stern 		urb->start_frame = frame;
1291caf3827aSAlan Stern 	}
1292caf3827aSAlan Stern 
1293caf3827aSAlan Stern 	/* Make sure we won't have to go too far into the future */
1294c8155cc5SAlan Stern 	if (uhci_frame_before_eq(uhci->last_iso_frame + UHCI_NUMFRAMES,
1295caf3827aSAlan Stern 			urb->start_frame + urb->number_of_packets *
1296caf3827aSAlan Stern 				urb->interval))
12970ed8fee1SAlan Stern 		return -EFBIG;
12980ed8fee1SAlan Stern 
12991da177e4SLinus Torvalds 	status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
13001da177e4SLinus Torvalds 	destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
13011da177e4SLinus Torvalds 
1302b81d3436SAlan Stern 	for (i = 0; i < urb->number_of_packets; i++) {
13032532178aSAlan Stern 		td = uhci_alloc_td(uhci);
13041da177e4SLinus Torvalds 		if (!td)
13051da177e4SLinus Torvalds 			return -ENOMEM;
13061da177e4SLinus Torvalds 
130704538a25SAlan Stern 		uhci_add_td_to_urbp(td, urbp);
1308dccf4a48SAlan Stern 		uhci_fill_td(td, status, destination |
1309dccf4a48SAlan Stern 				uhci_explen(urb->iso_frame_desc[i].length),
1310dccf4a48SAlan Stern 				urb->transfer_dma +
1311dccf4a48SAlan Stern 					urb->iso_frame_desc[i].offset);
1312b81d3436SAlan Stern 	}
13131da177e4SLinus Torvalds 
1314dccf4a48SAlan Stern 	/* Set the interrupt-on-completion flag on the last packet. */
1315dccf4a48SAlan Stern 	td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
1316dccf4a48SAlan Stern 
1317dccf4a48SAlan Stern 	/* Add the TDs to the frame list */
1318b81d3436SAlan Stern 	frame = urb->start_frame;
1319b81d3436SAlan Stern 	list_for_each_entry(td, &urbp->td_list, list) {
1320dccf4a48SAlan Stern 		uhci_insert_td_in_frame_list(uhci, td, frame);
1321c8155cc5SAlan Stern 		frame += qh->period;
1322c8155cc5SAlan Stern 	}
1323c8155cc5SAlan Stern 
1324c8155cc5SAlan Stern 	if (list_empty(&qh->queue)) {
1325c8155cc5SAlan Stern 		qh->iso_packet_desc = &urb->iso_frame_desc[0];
1326c8155cc5SAlan Stern 		qh->iso_frame = urb->start_frame;
13271da177e4SLinus Torvalds 	}
13281da177e4SLinus Torvalds 
132917230acdSAlan Stern 	qh->skel = SKEL_ISO;
13303ca2a321SAlan Stern 	if (!qh->bandwidth_reserved)
13313ca2a321SAlan Stern 		uhci_reserve_bandwidth(uhci, qh);
1332dccf4a48SAlan Stern 	return 0;
13331da177e4SLinus Torvalds }
13341da177e4SLinus Torvalds 
13351da177e4SLinus Torvalds static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
13361da177e4SLinus Torvalds {
1337c8155cc5SAlan Stern 	struct uhci_td *td, *tmp;
1338c8155cc5SAlan Stern 	struct urb_priv *urbp = urb->hcpriv;
1339c8155cc5SAlan Stern 	struct uhci_qh *qh = urbp->qh;
1340c8155cc5SAlan Stern 
1341c8155cc5SAlan Stern 	list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
1342c8155cc5SAlan Stern 		unsigned int ctrlstat;
13431da177e4SLinus Torvalds 		int status;
13441da177e4SLinus Torvalds 		int actlength;
13451da177e4SLinus Torvalds 
1346c8155cc5SAlan Stern 		if (uhci_frame_before_eq(uhci->cur_iso_frame, qh->iso_frame))
13471da177e4SLinus Torvalds 			return -EINPROGRESS;
13481da177e4SLinus Torvalds 
1349c8155cc5SAlan Stern 		uhci_remove_tds_from_frame(uhci, qh->iso_frame);
13501da177e4SLinus Torvalds 
1351c8155cc5SAlan Stern 		ctrlstat = td_status(td);
1352c8155cc5SAlan Stern 		if (ctrlstat & TD_CTRL_ACTIVE) {
1353c8155cc5SAlan Stern 			status = -EXDEV;	/* TD was added too late? */
1354c8155cc5SAlan Stern 		} else {
13551da177e4SLinus Torvalds 			status = uhci_map_status(uhci_status_bits(ctrlstat),
13561da177e4SLinus Torvalds 					usb_pipeout(urb->pipe));
1357c8155cc5SAlan Stern 			actlength = uhci_actual_length(ctrlstat);
1358c8155cc5SAlan Stern 
1359c8155cc5SAlan Stern 			urb->actual_length += actlength;
1360c8155cc5SAlan Stern 			qh->iso_packet_desc->actual_length = actlength;
1361c8155cc5SAlan Stern 			qh->iso_packet_desc->status = status;
1362c8155cc5SAlan Stern 		}
1363ee7d1f3fSAlan Stern 		if (status)
13641da177e4SLinus Torvalds 			urb->error_count++;
13651da177e4SLinus Torvalds 
1366c8155cc5SAlan Stern 		uhci_remove_td_from_urbp(td);
1367c8155cc5SAlan Stern 		uhci_free_td(uhci, td);
1368c8155cc5SAlan Stern 		qh->iso_frame += qh->period;
1369c8155cc5SAlan Stern 		++qh->iso_packet_desc;
13701da177e4SLinus Torvalds 	}
1371ee7d1f3fSAlan Stern 	return 0;
13721da177e4SLinus Torvalds }
13731da177e4SLinus Torvalds 
13741da177e4SLinus Torvalds static int uhci_urb_enqueue(struct usb_hcd *hcd,
137555016f10SAl Viro 		struct urb *urb, gfp_t mem_flags)
13761da177e4SLinus Torvalds {
13771da177e4SLinus Torvalds 	int ret;
13781da177e4SLinus Torvalds 	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
13791da177e4SLinus Torvalds 	unsigned long flags;
1380dccf4a48SAlan Stern 	struct urb_priv *urbp;
1381dccf4a48SAlan Stern 	struct uhci_qh *qh;
13821da177e4SLinus Torvalds 
13831da177e4SLinus Torvalds 	spin_lock_irqsave(&uhci->lock, flags);
13841da177e4SLinus Torvalds 
1385e9df41c5SAlan Stern 	ret = usb_hcd_link_urb_to_ep(hcd, urb);
1386e9df41c5SAlan Stern 	if (ret)
1387e9df41c5SAlan Stern 		goto done_not_linked;
13881da177e4SLinus Torvalds 
13891da177e4SLinus Torvalds 	ret = -ENOMEM;
1390dccf4a48SAlan Stern 	urbp = uhci_alloc_urb_priv(uhci, urb);
1391dccf4a48SAlan Stern 	if (!urbp)
1392dccf4a48SAlan Stern 		goto done;
1393dccf4a48SAlan Stern 
1394e9df41c5SAlan Stern 	if (urb->ep->hcpriv)
1395e9df41c5SAlan Stern 		qh = urb->ep->hcpriv;
1396dccf4a48SAlan Stern 	else {
1397e9df41c5SAlan Stern 		qh = uhci_alloc_qh(uhci, urb->dev, urb->ep);
1398dccf4a48SAlan Stern 		if (!qh)
1399dccf4a48SAlan Stern 			goto err_no_qh;
14001da177e4SLinus Torvalds 	}
1401dccf4a48SAlan Stern 	urbp->qh = qh;
14021da177e4SLinus Torvalds 
14034de7d2c2SAlan Stern 	switch (qh->type) {
14044de7d2c2SAlan Stern 	case USB_ENDPOINT_XFER_CONTROL:
1405dccf4a48SAlan Stern 		ret = uhci_submit_control(uhci, urb, qh);
1406dccf4a48SAlan Stern 		break;
14074de7d2c2SAlan Stern 	case USB_ENDPOINT_XFER_BULK:
1408dccf4a48SAlan Stern 		ret = uhci_submit_bulk(uhci, urb, qh);
14091da177e4SLinus Torvalds 		break;
14104de7d2c2SAlan Stern 	case USB_ENDPOINT_XFER_INT:
1411dccf4a48SAlan Stern 		ret = uhci_submit_interrupt(uhci, urb, qh);
14121da177e4SLinus Torvalds 		break;
14134de7d2c2SAlan Stern 	case USB_ENDPOINT_XFER_ISOC:
1414c8155cc5SAlan Stern 		urb->error_count = 0;
1415dccf4a48SAlan Stern 		ret = uhci_submit_isochronous(uhci, urb, qh);
14161da177e4SLinus Torvalds 		break;
14171da177e4SLinus Torvalds 	}
1418dccf4a48SAlan Stern 	if (ret != 0)
1419dccf4a48SAlan Stern 		goto err_submit_failed;
14201da177e4SLinus Torvalds 
1421dccf4a48SAlan Stern 	/* Add this URB to the QH */
1422dccf4a48SAlan Stern 	urbp->qh = qh;
1423dccf4a48SAlan Stern 	list_add_tail(&urbp->node, &qh->queue);
14241da177e4SLinus Torvalds 
1425dccf4a48SAlan Stern 	/* If the new URB is the first and only one on this QH then either
1426dccf4a48SAlan Stern 	 * the QH is new and idle or else it's unlinked and waiting to
14272775562aSAlan Stern 	 * become idle, so we can activate it right away.  But only if the
14282775562aSAlan Stern 	 * queue isn't stopped. */
142984afddd7SAlan Stern 	if (qh->queue.next == &urbp->node && !qh->is_stopped) {
1430dccf4a48SAlan Stern 		uhci_activate_qh(uhci, qh);
1431c5e3b741SAlan Stern 		uhci_urbp_wants_fsbr(uhci, urbp);
143284afddd7SAlan Stern 	}
1433dccf4a48SAlan Stern 	goto done;
1434dccf4a48SAlan Stern 
1435dccf4a48SAlan Stern err_submit_failed:
1436dccf4a48SAlan Stern 	if (qh->state == QH_STATE_IDLE)
1437dccf4a48SAlan Stern 		uhci_make_qh_idle(uhci, qh);	/* Reclaim unused QH */
1438dccf4a48SAlan Stern err_no_qh:
1439dccf4a48SAlan Stern 	uhci_free_urb_priv(uhci, urbp);
1440dccf4a48SAlan Stern done:
1441e9df41c5SAlan Stern 	if (ret)
1442e9df41c5SAlan Stern 		usb_hcd_unlink_urb_from_ep(hcd, urb);
1443e9df41c5SAlan Stern done_not_linked:
14441da177e4SLinus Torvalds 	spin_unlock_irqrestore(&uhci->lock, flags);
14451da177e4SLinus Torvalds 	return ret;
14461da177e4SLinus Torvalds }
14471da177e4SLinus Torvalds 
1448e9df41c5SAlan Stern static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
14491da177e4SLinus Torvalds {
14501da177e4SLinus Torvalds 	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
14511da177e4SLinus Torvalds 	unsigned long flags;
145210b8e47dSAlan Stern 	struct uhci_qh *qh;
1453e9df41c5SAlan Stern 	int rc;
14541da177e4SLinus Torvalds 
14551da177e4SLinus Torvalds 	spin_lock_irqsave(&uhci->lock, flags);
1456e9df41c5SAlan Stern 	rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1457e9df41c5SAlan Stern 	if (rc)
14581da177e4SLinus Torvalds 		goto done;
1459e9df41c5SAlan Stern 
1460e9df41c5SAlan Stern 	qh = ((struct urb_priv *) urb->hcpriv)->qh;
14611da177e4SLinus Torvalds 
1462dccf4a48SAlan Stern 	/* Remove Isochronous TDs from the frame list ASAP */
146310b8e47dSAlan Stern 	if (qh->type == USB_ENDPOINT_XFER_ISOC) {
1464dccf4a48SAlan Stern 		uhci_unlink_isochronous_tds(uhci, urb);
146510b8e47dSAlan Stern 		mb();
146610b8e47dSAlan Stern 
146710b8e47dSAlan Stern 		/* If the URB has already started, update the QH unlink time */
146810b8e47dSAlan Stern 		uhci_get_current_frame_number(uhci);
146910b8e47dSAlan Stern 		if (uhci_frame_before_eq(urb->start_frame, uhci->frame_number))
147010b8e47dSAlan Stern 			qh->unlink_frame = uhci->frame_number;
147110b8e47dSAlan Stern 	}
147210b8e47dSAlan Stern 
147310b8e47dSAlan Stern 	uhci_unlink_qh(uhci, qh);
14741da177e4SLinus Torvalds 
14751da177e4SLinus Torvalds done:
14761da177e4SLinus Torvalds 	spin_unlock_irqrestore(&uhci->lock, flags);
1477e9df41c5SAlan Stern 	return rc;
14781da177e4SLinus Torvalds }
14791da177e4SLinus Torvalds 
14800ed8fee1SAlan Stern /*
14810ed8fee1SAlan Stern  * Finish unlinking an URB and give it back
14820ed8fee1SAlan Stern  */
14830ed8fee1SAlan Stern static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh,
14844a00027dSAlan Stern 		struct urb *urb, int status)
14850ed8fee1SAlan Stern __releases(uhci->lock)
14860ed8fee1SAlan Stern __acquires(uhci->lock)
14871da177e4SLinus Torvalds {
14881da177e4SLinus Torvalds 	struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
14891da177e4SLinus Torvalds 
1490e7e7c360SAlan Stern 	if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1491e7e7c360SAlan Stern 
1492e7e7c360SAlan Stern 		/* urb->actual_length < 0 means the setup transaction didn't
1493e7e7c360SAlan Stern 		 * complete successfully.  Either it failed or the URB was
1494e7e7c360SAlan Stern 		 * unlinked first.  Regardless, don't confuse people with a
1495e7e7c360SAlan Stern 		 * negative length. */
1496e7e7c360SAlan Stern 		urb->actual_length = max(urb->actual_length, 0);
1497e7e7c360SAlan Stern 	}
1498e7e7c360SAlan Stern 
1499c8155cc5SAlan Stern 	/* When giving back the first URB in an Isochronous queue,
1500c8155cc5SAlan Stern 	 * reinitialize the QH's iso-related members for the next URB. */
1501e7e7c360SAlan Stern 	else if (qh->type == USB_ENDPOINT_XFER_ISOC &&
1502c8155cc5SAlan Stern 			urbp->node.prev == &qh->queue &&
1503c8155cc5SAlan Stern 			urbp->node.next != &qh->queue) {
1504c8155cc5SAlan Stern 		struct urb *nurb = list_entry(urbp->node.next,
1505c8155cc5SAlan Stern 				struct urb_priv, node)->urb;
1506c8155cc5SAlan Stern 
1507c8155cc5SAlan Stern 		qh->iso_packet_desc = &nurb->iso_frame_desc[0];
1508c8155cc5SAlan Stern 		qh->iso_frame = nurb->start_frame;
1509c8155cc5SAlan Stern 	}
15101da177e4SLinus Torvalds 
15110ed8fee1SAlan Stern 	/* Take the URB off the QH's queue.  If the queue is now empty,
15120ed8fee1SAlan Stern 	 * this is a perfect time for a toggle fixup. */
15130ed8fee1SAlan Stern 	list_del_init(&urbp->node);
15140ed8fee1SAlan Stern 	if (list_empty(&qh->queue) && qh->needs_fixup) {
15150ed8fee1SAlan Stern 		usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
15160ed8fee1SAlan Stern 				usb_pipeout(urb->pipe), qh->initial_toggle);
15170ed8fee1SAlan Stern 		qh->needs_fixup = 0;
15180ed8fee1SAlan Stern 	}
15190ed8fee1SAlan Stern 
15200ed8fee1SAlan Stern 	uhci_free_urb_priv(uhci, urbp);
1521e9df41c5SAlan Stern 	usb_hcd_unlink_urb_from_ep(uhci_to_hcd(uhci), urb);
15220ed8fee1SAlan Stern 
15230ed8fee1SAlan Stern 	spin_unlock(&uhci->lock);
15244a00027dSAlan Stern 	usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, status);
15250ed8fee1SAlan Stern 	spin_lock(&uhci->lock);
15260ed8fee1SAlan Stern 
15270ed8fee1SAlan Stern 	/* If the queue is now empty, we can unlink the QH and give up its
15280ed8fee1SAlan Stern 	 * reserved bandwidth. */
15290ed8fee1SAlan Stern 	if (list_empty(&qh->queue)) {
15300ed8fee1SAlan Stern 		uhci_unlink_qh(uhci, qh);
15313ca2a321SAlan Stern 		if (qh->bandwidth_reserved)
15323ca2a321SAlan Stern 			uhci_release_bandwidth(uhci, qh);
15330ed8fee1SAlan Stern 	}
15340ed8fee1SAlan Stern }
15350ed8fee1SAlan Stern 
15360ed8fee1SAlan Stern /*
15370ed8fee1SAlan Stern  * Scan the URBs in a QH's queue
15380ed8fee1SAlan Stern  */
15390ed8fee1SAlan Stern #define QH_FINISHED_UNLINKING(qh)			\
15400ed8fee1SAlan Stern 		(qh->state == QH_STATE_UNLINKING &&	\
15410ed8fee1SAlan Stern 		uhci->frame_number + uhci->is_stopped != qh->unlink_frame)
15420ed8fee1SAlan Stern 
15437d12e780SDavid Howells static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
15440ed8fee1SAlan Stern {
15450ed8fee1SAlan Stern 	struct urb_priv *urbp;
15460ed8fee1SAlan Stern 	struct urb *urb;
15470ed8fee1SAlan Stern 	int status;
15480ed8fee1SAlan Stern 
15490ed8fee1SAlan Stern 	while (!list_empty(&qh->queue)) {
15500ed8fee1SAlan Stern 		urbp = list_entry(qh->queue.next, struct urb_priv, node);
15510ed8fee1SAlan Stern 		urb = urbp->urb;
15520ed8fee1SAlan Stern 
1553b1869000SAlan Stern 		if (qh->type == USB_ENDPOINT_XFER_ISOC)
15540ed8fee1SAlan Stern 			status = uhci_result_isochronous(uhci, urb);
1555b1869000SAlan Stern 		else
15560ed8fee1SAlan Stern 			status = uhci_result_common(uhci, urb);
15570ed8fee1SAlan Stern 		if (status == -EINPROGRESS)
15580ed8fee1SAlan Stern 			break;
15590ed8fee1SAlan Stern 
15600ed8fee1SAlan Stern 		/* Dequeued but completed URBs can't be given back unless
15610ed8fee1SAlan Stern 		 * the QH is stopped or has finished unlinking. */
1562eb231054SAlan Stern 		if (urb->unlinked) {
15632775562aSAlan Stern 			if (QH_FINISHED_UNLINKING(qh))
15642775562aSAlan Stern 				qh->is_stopped = 1;
15652775562aSAlan Stern 			else if (!qh->is_stopped)
15660ed8fee1SAlan Stern 				return;
15672775562aSAlan Stern 		}
15680ed8fee1SAlan Stern 
15694a00027dSAlan Stern 		uhci_giveback_urb(uhci, qh, urb, status);
1570ee7d1f3fSAlan Stern 		if (status < 0)
15710ed8fee1SAlan Stern 			break;
15720ed8fee1SAlan Stern 	}
15730ed8fee1SAlan Stern 
15740ed8fee1SAlan Stern 	/* If the QH is neither stopped nor finished unlinking (normal case),
15750ed8fee1SAlan Stern 	 * our work here is done. */
15762775562aSAlan Stern 	if (QH_FINISHED_UNLINKING(qh))
15772775562aSAlan Stern 		qh->is_stopped = 1;
15782775562aSAlan Stern 	else if (!qh->is_stopped)
15790ed8fee1SAlan Stern 		return;
15800ed8fee1SAlan Stern 
15810ed8fee1SAlan Stern 	/* Otherwise give back each of the dequeued URBs */
15822775562aSAlan Stern restart:
15830ed8fee1SAlan Stern 	list_for_each_entry(urbp, &qh->queue, node) {
15840ed8fee1SAlan Stern 		urb = urbp->urb;
1585eb231054SAlan Stern 		if (urb->unlinked) {
158610b8e47dSAlan Stern 
158710b8e47dSAlan Stern 			/* Fix up the TD links and save the toggles for
158810b8e47dSAlan Stern 			 * non-Isochronous queues.  For Isochronous queues,
158910b8e47dSAlan Stern 			 * test for too-recent dequeues. */
159010b8e47dSAlan Stern 			if (!uhci_cleanup_queue(uhci, qh, urb)) {
159110b8e47dSAlan Stern 				qh->is_stopped = 0;
159210b8e47dSAlan Stern 				return;
159310b8e47dSAlan Stern 			}
15944a00027dSAlan Stern 			uhci_giveback_urb(uhci, qh, urb, 0);
15950ed8fee1SAlan Stern 			goto restart;
15960ed8fee1SAlan Stern 		}
15970ed8fee1SAlan Stern 	}
15980ed8fee1SAlan Stern 	qh->is_stopped = 0;
15990ed8fee1SAlan Stern 
16000ed8fee1SAlan Stern 	/* There are no more dequeued URBs.  If there are still URBs on the
16010ed8fee1SAlan Stern 	 * queue, the QH can now be re-activated. */
16020ed8fee1SAlan Stern 	if (!list_empty(&qh->queue)) {
16030ed8fee1SAlan Stern 		if (qh->needs_fixup)
16040ed8fee1SAlan Stern 			uhci_fixup_toggles(qh, 0);
160584afddd7SAlan Stern 
160684afddd7SAlan Stern 		/* If the first URB on the queue wants FSBR but its time
160784afddd7SAlan Stern 		 * limit has expired, set the next TD to interrupt on
160884afddd7SAlan Stern 		 * completion before reactivating the QH. */
160984afddd7SAlan Stern 		urbp = list_entry(qh->queue.next, struct urb_priv, node);
161084afddd7SAlan Stern 		if (urbp->fsbr && qh->wait_expired) {
161184afddd7SAlan Stern 			struct uhci_td *td = list_entry(urbp->td_list.next,
161284afddd7SAlan Stern 					struct uhci_td, list);
161384afddd7SAlan Stern 
161484afddd7SAlan Stern 			td->status |= __cpu_to_le32(TD_CTRL_IOC);
161584afddd7SAlan Stern 		}
161684afddd7SAlan Stern 
16170ed8fee1SAlan Stern 		uhci_activate_qh(uhci, qh);
16180ed8fee1SAlan Stern 	}
16190ed8fee1SAlan Stern 
16200ed8fee1SAlan Stern 	/* The queue is empty.  The QH can become idle if it is fully
16210ed8fee1SAlan Stern 	 * unlinked. */
16220ed8fee1SAlan Stern 	else if (QH_FINISHED_UNLINKING(qh))
16230ed8fee1SAlan Stern 		uhci_make_qh_idle(uhci, qh);
16241da177e4SLinus Torvalds }
16251da177e4SLinus Torvalds 
16260ed8fee1SAlan Stern /*
162784afddd7SAlan Stern  * Check for queues that have made some forward progress.
162884afddd7SAlan Stern  * Returns 0 if the queue is not Isochronous, is ACTIVE, and
162984afddd7SAlan Stern  * has not advanced since last examined; 1 otherwise.
1630b761d9d8SAlan Stern  *
1631b761d9d8SAlan Stern  * Early Intel controllers have a bug which causes qh->element sometimes
1632b761d9d8SAlan Stern  * not to advance when a TD completes successfully.  The queue remains
1633b761d9d8SAlan Stern  * stuck on the inactive completed TD.  We detect such cases and advance
1634b761d9d8SAlan Stern  * the element pointer by hand.
163584afddd7SAlan Stern  */
163684afddd7SAlan Stern static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh)
163784afddd7SAlan Stern {
163884afddd7SAlan Stern 	struct urb_priv *urbp = NULL;
163984afddd7SAlan Stern 	struct uhci_td *td;
164084afddd7SAlan Stern 	int ret = 1;
164184afddd7SAlan Stern 	unsigned status;
164284afddd7SAlan Stern 
164384afddd7SAlan Stern 	if (qh->type == USB_ENDPOINT_XFER_ISOC)
1644c5e3b741SAlan Stern 		goto done;
164584afddd7SAlan Stern 
164684afddd7SAlan Stern 	/* Treat an UNLINKING queue as though it hasn't advanced.
164784afddd7SAlan Stern 	 * This is okay because reactivation will treat it as though
164884afddd7SAlan Stern 	 * it has advanced, and if it is going to become IDLE then
164984afddd7SAlan Stern 	 * this doesn't matter anyway.  Furthermore it's possible
165084afddd7SAlan Stern 	 * for an UNLINKING queue not to have any URBs at all, or
165184afddd7SAlan Stern 	 * for its first URB not to have any TDs (if it was dequeued
165284afddd7SAlan Stern 	 * just as it completed).  So it's not easy in any case to
165384afddd7SAlan Stern 	 * test whether such queues have advanced. */
165484afddd7SAlan Stern 	if (qh->state != QH_STATE_ACTIVE) {
165584afddd7SAlan Stern 		urbp = NULL;
165684afddd7SAlan Stern 		status = 0;
165784afddd7SAlan Stern 
165884afddd7SAlan Stern 	} else {
165984afddd7SAlan Stern 		urbp = list_entry(qh->queue.next, struct urb_priv, node);
166084afddd7SAlan Stern 		td = list_entry(urbp->td_list.next, struct uhci_td, list);
166184afddd7SAlan Stern 		status = td_status(td);
166284afddd7SAlan Stern 		if (!(status & TD_CTRL_ACTIVE)) {
166384afddd7SAlan Stern 
166484afddd7SAlan Stern 			/* We're okay, the queue has advanced */
166584afddd7SAlan Stern 			qh->wait_expired = 0;
166684afddd7SAlan Stern 			qh->advance_jiffies = jiffies;
1667c5e3b741SAlan Stern 			goto done;
166884afddd7SAlan Stern 		}
166984afddd7SAlan Stern 		ret = 0;
167084afddd7SAlan Stern 	}
167184afddd7SAlan Stern 
167284afddd7SAlan Stern 	/* The queue hasn't advanced; check for timeout */
1673c5e3b741SAlan Stern 	if (qh->wait_expired)
1674c5e3b741SAlan Stern 		goto done;
1675c5e3b741SAlan Stern 
1676c5e3b741SAlan Stern 	if (time_after(jiffies, qh->advance_jiffies + QH_WAIT_TIMEOUT)) {
1677b761d9d8SAlan Stern 
1678b761d9d8SAlan Stern 		/* Detect the Intel bug and work around it */
167928b9325eSAlan Stern 		if (qh->post_td && qh_element(qh) == LINK_TO_TD(qh->post_td)) {
1680b761d9d8SAlan Stern 			qh->element = qh->post_td->link;
1681b761d9d8SAlan Stern 			qh->advance_jiffies = jiffies;
1682c5e3b741SAlan Stern 			ret = 1;
1683c5e3b741SAlan Stern 			goto done;
1684b761d9d8SAlan Stern 		}
1685b761d9d8SAlan Stern 
168684afddd7SAlan Stern 		qh->wait_expired = 1;
168784afddd7SAlan Stern 
168884afddd7SAlan Stern 		/* If the current URB wants FSBR, unlink it temporarily
168984afddd7SAlan Stern 		 * so that we can safely set the next TD to interrupt on
169084afddd7SAlan Stern 		 * completion.  That way we'll know as soon as the queue
169184afddd7SAlan Stern 		 * starts moving again. */
169284afddd7SAlan Stern 		if (urbp && urbp->fsbr && !(status & TD_CTRL_IOC))
169384afddd7SAlan Stern 			uhci_unlink_qh(uhci, qh);
1694c5e3b741SAlan Stern 
1695c5e3b741SAlan Stern 	} else {
1696c5e3b741SAlan Stern 		/* Unmoving but not-yet-expired queues keep FSBR alive */
1697c5e3b741SAlan Stern 		if (urbp)
1698c5e3b741SAlan Stern 			uhci_urbp_wants_fsbr(uhci, urbp);
169984afddd7SAlan Stern 	}
1700c5e3b741SAlan Stern 
1701c5e3b741SAlan Stern done:
170284afddd7SAlan Stern 	return ret;
170384afddd7SAlan Stern }
170484afddd7SAlan Stern 
170584afddd7SAlan Stern /*
17060ed8fee1SAlan Stern  * Process events in the schedule, but only in one thread at a time
17070ed8fee1SAlan Stern  */
17087d12e780SDavid Howells static void uhci_scan_schedule(struct uhci_hcd *uhci)
17091da177e4SLinus Torvalds {
17100ed8fee1SAlan Stern 	int i;
17110ed8fee1SAlan Stern 	struct uhci_qh *qh;
17121da177e4SLinus Torvalds 
17131da177e4SLinus Torvalds 	/* Don't allow re-entrant calls */
17141da177e4SLinus Torvalds 	if (uhci->scan_in_progress) {
17151da177e4SLinus Torvalds 		uhci->need_rescan = 1;
17161da177e4SLinus Torvalds 		return;
17171da177e4SLinus Torvalds 	}
17181da177e4SLinus Torvalds 	uhci->scan_in_progress = 1;
17191da177e4SLinus Torvalds rescan:
17201da177e4SLinus Torvalds 	uhci->need_rescan = 0;
1721c5e3b741SAlan Stern 	uhci->fsbr_is_wanted = 0;
17221da177e4SLinus Torvalds 
17236c1b445cSAlan Stern 	uhci_clear_next_interrupt(uhci);
17241da177e4SLinus Torvalds 	uhci_get_current_frame_number(uhci);
1725c8155cc5SAlan Stern 	uhci->cur_iso_frame = uhci->frame_number;
17261da177e4SLinus Torvalds 
17270ed8fee1SAlan Stern 	/* Go through all the QH queues and process the URBs in each one */
17280ed8fee1SAlan Stern 	for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) {
17290ed8fee1SAlan Stern 		uhci->next_qh = list_entry(uhci->skelqh[i]->node.next,
17300ed8fee1SAlan Stern 				struct uhci_qh, node);
17310ed8fee1SAlan Stern 		while ((qh = uhci->next_qh) != uhci->skelqh[i]) {
17320ed8fee1SAlan Stern 			uhci->next_qh = list_entry(qh->node.next,
17330ed8fee1SAlan Stern 					struct uhci_qh, node);
173484afddd7SAlan Stern 
173584afddd7SAlan Stern 			if (uhci_advance_check(uhci, qh)) {
17367d12e780SDavid Howells 				uhci_scan_qh(uhci, qh);
1737c5e3b741SAlan Stern 				if (qh->state == QH_STATE_ACTIVE) {
1738c5e3b741SAlan Stern 					uhci_urbp_wants_fsbr(uhci,
1739c5e3b741SAlan Stern 	list_entry(qh->queue.next, struct urb_priv, node));
1740c5e3b741SAlan Stern 				}
174184afddd7SAlan Stern 			}
17421da177e4SLinus Torvalds 		}
17430ed8fee1SAlan Stern 	}
17441da177e4SLinus Torvalds 
1745c8155cc5SAlan Stern 	uhci->last_iso_frame = uhci->cur_iso_frame;
17461da177e4SLinus Torvalds 	if (uhci->need_rescan)
17471da177e4SLinus Torvalds 		goto rescan;
17481da177e4SLinus Torvalds 	uhci->scan_in_progress = 0;
17491da177e4SLinus Torvalds 
1750c5e3b741SAlan Stern 	if (uhci->fsbr_is_on && !uhci->fsbr_is_wanted &&
1751c5e3b741SAlan Stern 			!uhci->fsbr_expiring) {
1752c5e3b741SAlan Stern 		uhci->fsbr_expiring = 1;
1753c5e3b741SAlan Stern 		mod_timer(&uhci->fsbr_timer, jiffies + FSBR_OFF_DELAY);
1754c5e3b741SAlan Stern 	}
175584afddd7SAlan Stern 
175604538a25SAlan Stern 	if (list_empty(&uhci->skel_unlink_qh->node))
17571da177e4SLinus Torvalds 		uhci_clear_next_interrupt(uhci);
17581da177e4SLinus Torvalds 	else
17591da177e4SLinus Torvalds 		uhci_set_next_interrupt(uhci);
17601da177e4SLinus Torvalds }
1761