blob: da6f56d996ce56f61cd1be20a093c2c16ff54702 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Universal Host Controller Interface driver for USB.
3 *
4 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
5 *
6 * (C) Copyright 1999 Linus Torvalds
7 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
8 * (C) Copyright 1999 Randy Dunlap
9 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
10 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
11 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
12 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
13 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
14 * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
15 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
Alan Stern17230ac2007-02-19 15:52:45 -050016 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20/*
21 * Technically, updating td->status here is a race, but it's not really a
22 * problem. The worst that can happen is that we set the IOC bit again
23 * generating a spurious interrupt. We could fix this by creating another
24 * QH and leaving the IOC bit always set, but then we would have to play
25 * games with the FSBR code to make sure we get the correct order in all
26 * the cases. I don't think it's worth the effort
27 */
Alan Sterndccf4a42005-12-17 17:58:46 -050028static void uhci_set_next_interrupt(struct uhci_hcd *uhci)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
Alan Stern6c1b4452005-04-21 16:04:58 -040030 if (uhci->is_stopped)
Alan Stern1f09df82005-09-05 13:59:51 -040031 mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
Jan Andersson51e2f622011-05-18 10:44:51 +020032 uhci->term_td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033}
34
35static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
36{
Jan Andersson51e2f622011-05-18 10:44:51 +020037 uhci->term_td->status &= ~cpu_to_hc32(uhci, TD_CTRL_IOC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038}
39
Alan Stern84afddd2006-05-12 11:35:45 -040040
41/*
42 * Full-Speed Bandwidth Reclamation (FSBR).
43 * We turn on FSBR whenever a queue that wants it is advancing,
44 * and leave it on for a short time thereafter.
45 */
46static void uhci_fsbr_on(struct uhci_hcd *uhci)
47{
Alan Sterne009f1b2007-03-19 15:31:42 -040048 struct uhci_qh *lqh;
Alan Stern17230ac2007-02-19 15:52:45 -050049
Alan Sterne009f1b2007-03-19 15:31:42 -040050 /* The terminating skeleton QH always points back to the first
51 * FSBR QH. Make the last async QH point to the terminating
52 * skeleton QH. */
Alan Stern84afddd2006-05-12 11:35:45 -040053 uhci->fsbr_is_on = 1;
Alan Stern17230ac2007-02-19 15:52:45 -050054 lqh = list_entry(uhci->skel_async_qh->node.prev,
55 struct uhci_qh, node);
Jan Andersson51e2f622011-05-18 10:44:51 +020056 lqh->link = LINK_TO_QH(uhci, uhci->skel_term_qh);
Alan Stern84afddd2006-05-12 11:35:45 -040057}
58
59static void uhci_fsbr_off(struct uhci_hcd *uhci)
60{
Alan Stern17230ac2007-02-19 15:52:45 -050061 struct uhci_qh *lqh;
62
Alan Sterne009f1b2007-03-19 15:31:42 -040063 /* Remove the link from the last async QH to the terminating
64 * skeleton QH. */
Alan Stern84afddd2006-05-12 11:35:45 -040065 uhci->fsbr_is_on = 0;
Alan Stern17230ac2007-02-19 15:52:45 -050066 lqh = list_entry(uhci->skel_async_qh->node.prev,
67 struct uhci_qh, node);
Jan Andersson51e2f622011-05-18 10:44:51 +020068 lqh->link = UHCI_PTR_TERM(uhci);
Alan Stern84afddd2006-05-12 11:35:45 -040069}
70
71static void uhci_add_fsbr(struct uhci_hcd *uhci, struct urb *urb)
72{
73 struct urb_priv *urbp = urb->hcpriv;
74
75 if (!(urb->transfer_flags & URB_NO_FSBR))
76 urbp->fsbr = 1;
77}
78
Alan Sternc5e3b742006-06-05 12:28:57 -040079static void uhci_urbp_wants_fsbr(struct uhci_hcd *uhci, struct urb_priv *urbp)
Alan Stern84afddd2006-05-12 11:35:45 -040080{
Alan Stern84afddd2006-05-12 11:35:45 -040081 if (urbp->fsbr) {
Alan Sternc5e3b742006-06-05 12:28:57 -040082 uhci->fsbr_is_wanted = 1;
Alan Stern84afddd2006-05-12 11:35:45 -040083 if (!uhci->fsbr_is_on)
84 uhci_fsbr_on(uhci);
Alan Sternc5e3b742006-06-05 12:28:57 -040085 else if (uhci->fsbr_expiring) {
86 uhci->fsbr_expiring = 0;
87 del_timer(&uhci->fsbr_timer);
88 }
Alan Stern84afddd2006-05-12 11:35:45 -040089 }
90}
91
Alan Sternc5e3b742006-06-05 12:28:57 -040092static void uhci_fsbr_timeout(unsigned long _uhci)
93{
94 struct uhci_hcd *uhci = (struct uhci_hcd *) _uhci;
95 unsigned long flags;
96
97 spin_lock_irqsave(&uhci->lock, flags);
98 if (uhci->fsbr_expiring) {
99 uhci->fsbr_expiring = 0;
100 uhci_fsbr_off(uhci);
101 }
102 spin_unlock_irqrestore(&uhci->lock, flags);
103}
104
Alan Stern84afddd2006-05-12 11:35:45 -0400105
Alan Stern25321782005-04-25 11:14:31 -0400106static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
108 dma_addr_t dma_handle;
109 struct uhci_td *td;
110
111 td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
112 if (!td)
113 return NULL;
114
115 td->dma_handle = dma_handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 td->frame = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118 INIT_LIST_HEAD(&td->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 INIT_LIST_HEAD(&td->fl_list);
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return td;
122}
123
Alan Sterndccf4a42005-12-17 17:58:46 -0500124static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
125{
Arjan van de Ven51720462008-09-20 19:09:37 -0700126 if (!list_empty(&td->list))
127 dev_WARN(uhci_dev(uhci), "td %p still in list!\n", td);
128 if (!list_empty(&td->fl_list))
129 dev_WARN(uhci_dev(uhci), "td %p still in fl_list!\n", td);
Alan Sterndccf4a42005-12-17 17:58:46 -0500130
131 dma_pool_free(uhci->td_pool, td, td->dma_handle);
132}
133
Jan Andersson51e2f622011-05-18 10:44:51 +0200134static inline void uhci_fill_td(struct uhci_hcd *uhci, struct uhci_td *td,
135 u32 status, u32 token, u32 buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Jan Andersson51e2f622011-05-18 10:44:51 +0200137 td->status = cpu_to_hc32(uhci, status);
138 td->token = cpu_to_hc32(uhci, token);
139 td->buffer = cpu_to_hc32(uhci, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Alan Stern04538a22006-05-12 11:29:04 -0400142static void uhci_add_td_to_urbp(struct uhci_td *td, struct urb_priv *urbp)
143{
144 list_add_tail(&td->list, &urbp->td_list);
145}
146
147static void uhci_remove_td_from_urbp(struct uhci_td *td)
148{
149 list_del_init(&td->list);
150}
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152/*
Alan Stern687f5f32005-11-30 17:16:19 -0500153 * We insert Isochronous URBs directly into the frame list at the beginning
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500155static inline void uhci_insert_td_in_frame_list(struct uhci_hcd *uhci,
156 struct uhci_td *td, unsigned framenum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
158 framenum &= (UHCI_NUMFRAMES - 1);
159
160 td->frame = framenum;
161
162 /* Is there a TD already mapped there? */
Alan Sterna1d59ce2005-09-16 14:22:51 -0400163 if (uhci->frame_cpu[framenum]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct uhci_td *ftd, *ltd;
165
Alan Sterna1d59ce2005-09-16 14:22:51 -0400166 ftd = uhci->frame_cpu[framenum];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
168
169 list_add_tail(&td->fl_list, &ftd->fl_list);
170
171 td->link = ltd->link;
172 wmb();
Jan Andersson51e2f622011-05-18 10:44:51 +0200173 ltd->link = LINK_TO_TD(uhci, td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 } else {
Alan Sterna1d59ce2005-09-16 14:22:51 -0400175 td->link = uhci->frame[framenum];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 wmb();
Jan Andersson51e2f622011-05-18 10:44:51 +0200177 uhci->frame[framenum] = LINK_TO_TD(uhci, td);
Alan Sterna1d59ce2005-09-16 14:22:51 -0400178 uhci->frame_cpu[framenum] = td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180}
181
Alan Sterndccf4a42005-12-17 17:58:46 -0500182static inline void uhci_remove_td_from_frame_list(struct uhci_hcd *uhci,
Alan Sternb81d3432005-10-13 17:00:24 -0400183 struct uhci_td *td)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
185 /* If it's not inserted, don't remove it */
Alan Sternb81d3432005-10-13 17:00:24 -0400186 if (td->frame == -1) {
187 WARN_ON(!list_empty(&td->fl_list));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return;
Alan Sternb81d3432005-10-13 17:00:24 -0400189 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Alan Sternb81d3432005-10-13 17:00:24 -0400191 if (uhci->frame_cpu[td->frame] == td) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (list_empty(&td->fl_list)) {
Alan Sterna1d59ce2005-09-16 14:22:51 -0400193 uhci->frame[td->frame] = td->link;
194 uhci->frame_cpu[td->frame] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 } else {
196 struct uhci_td *ntd;
197
Tobias Ollmann16325f12010-12-09 14:24:27 +0100198 ntd = list_entry(td->fl_list.next,
199 struct uhci_td,
200 fl_list);
Jan Andersson51e2f622011-05-18 10:44:51 +0200201 uhci->frame[td->frame] = LINK_TO_TD(uhci, ntd);
Alan Sterna1d59ce2005-09-16 14:22:51 -0400202 uhci->frame_cpu[td->frame] = ntd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
204 } else {
205 struct uhci_td *ptd;
206
207 ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
208 ptd->link = td->link;
209 }
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 list_del_init(&td->fl_list);
212 td->frame = -1;
213}
214
Alan Sternc8155cc2006-05-19 16:52:35 -0400215static inline void uhci_remove_tds_from_frame(struct uhci_hcd *uhci,
216 unsigned int framenum)
217{
218 struct uhci_td *ftd, *ltd;
219
220 framenum &= (UHCI_NUMFRAMES - 1);
221
222 ftd = uhci->frame_cpu[framenum];
223 if (ftd) {
224 ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
225 uhci->frame[framenum] = ltd->link;
226 uhci->frame_cpu[framenum] = NULL;
227
228 while (!list_empty(&ftd->fl_list))
229 list_del_init(ftd->fl_list.prev);
230 }
231}
232
Alan Sterndccf4a42005-12-17 17:58:46 -0500233/*
234 * Remove all the TDs for an Isochronous URB from the frame list
235 */
236static void uhci_unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb)
Alan Sternb81d3432005-10-13 17:00:24 -0400237{
238 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
239 struct uhci_td *td;
240
241 list_for_each_entry(td, &urbp->td_list, list)
Alan Sterndccf4a42005-12-17 17:58:46 -0500242 uhci_remove_td_from_frame_list(uhci, td);
Alan Sternb81d3432005-10-13 17:00:24 -0400243}
244
Alan Sterndccf4a42005-12-17 17:58:46 -0500245static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
246 struct usb_device *udev, struct usb_host_endpoint *hep)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
248 dma_addr_t dma_handle;
249 struct uhci_qh *qh;
250
251 qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
252 if (!qh)
253 return NULL;
254
Alan Stern59e29ed2006-05-12 11:19:19 -0400255 memset(qh, 0, sizeof(*qh));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 qh->dma_handle = dma_handle;
257
Jan Andersson51e2f622011-05-18 10:44:51 +0200258 qh->element = UHCI_PTR_TERM(uhci);
259 qh->link = UHCI_PTR_TERM(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Alan Sterndccf4a42005-12-17 17:58:46 -0500261 INIT_LIST_HEAD(&qh->queue);
262 INIT_LIST_HEAD(&qh->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Alan Sterndccf4a42005-12-17 17:58:46 -0500264 if (udev) { /* Normal QH */
Matthias Kaehlcke1eba67a2009-04-15 22:28:28 +0200265 qh->type = usb_endpoint_type(&hep->desc);
Alan Stern85a975d2007-01-08 12:01:43 -0500266 if (qh->type != USB_ENDPOINT_XFER_ISOC) {
267 qh->dummy_td = uhci_alloc_td(uhci);
268 if (!qh->dummy_td) {
269 dma_pool_free(uhci->qh_pool, qh, dma_handle);
270 return NULL;
271 }
Alan Sternaf0bb592005-12-17 18:00:12 -0500272 }
Alan Sterndccf4a42005-12-17 17:58:46 -0500273 qh->state = QH_STATE_IDLE;
274 qh->hep = hep;
275 qh->udev = udev;
276 hep->hcpriv = qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Alan Stern3ca2a322007-01-16 11:56:32 -0500278 if (qh->type == USB_ENDPOINT_XFER_INT ||
279 qh->type == USB_ENDPOINT_XFER_ISOC)
280 qh->load = usb_calc_bus_time(udev->speed,
281 usb_endpoint_dir_in(&hep->desc),
282 qh->type == USB_ENDPOINT_XFER_ISOC,
Kuninori Morimoto29cc8892011-08-23 03:12:03 -0700283 usb_endpoint_maxp(&hep->desc))
Alan Stern3ca2a322007-01-16 11:56:32 -0500284 / 1000 + 1;
285
Alan Sterndccf4a42005-12-17 17:58:46 -0500286 } else { /* Skeleton QH */
287 qh->state = QH_STATE_ACTIVE;
Alan Stern4de7d2c2006-05-05 16:26:58 -0400288 qh->type = -1;
Alan Sterndccf4a42005-12-17 17:58:46 -0500289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 return qh;
291}
292
293static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
294{
Alan Sterndccf4a42005-12-17 17:58:46 -0500295 WARN_ON(qh->state != QH_STATE_IDLE && qh->udev);
Arjan van de Ven51720462008-09-20 19:09:37 -0700296 if (!list_empty(&qh->queue))
297 dev_WARN(uhci_dev(uhci), "qh %p list not empty!\n", qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Alan Sterndccf4a42005-12-17 17:58:46 -0500299 list_del(&qh->node);
300 if (qh->udev) {
301 qh->hep->hcpriv = NULL;
Alan Stern85a975d2007-01-08 12:01:43 -0500302 if (qh->dummy_td)
303 uhci_free_td(uhci, qh->dummy_td);
Alan Sterndccf4a42005-12-17 17:58:46 -0500304 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
306}
307
308/*
Alan Sterna0b458b2006-05-12 11:23:19 -0400309 * When a queue is stopped and a dequeued URB is given back, adjust
310 * the previous TD link (if the URB isn't first on the queue) or
311 * save its toggle value (if it is first and is currently executing).
Alan Stern10b8e472006-05-19 16:39:52 -0400312 *
313 * Returns 0 if the URB should not yet be given back, 1 otherwise.
Alan Stern0ed8fee2005-12-17 18:02:38 -0500314 */
Alan Stern10b8e472006-05-19 16:39:52 -0400315static int uhci_cleanup_queue(struct uhci_hcd *uhci, struct uhci_qh *qh,
Alan Sterna0b458b2006-05-12 11:23:19 -0400316 struct urb *urb)
Alan Stern0ed8fee2005-12-17 18:02:38 -0500317{
Alan Sterna0b458b2006-05-12 11:23:19 -0400318 struct urb_priv *urbp = urb->hcpriv;
Alan Stern0ed8fee2005-12-17 18:02:38 -0500319 struct uhci_td *td;
Alan Stern10b8e472006-05-19 16:39:52 -0400320 int ret = 1;
Alan Stern0ed8fee2005-12-17 18:02:38 -0500321
Alan Sterna0b458b2006-05-12 11:23:19 -0400322 /* Isochronous pipes don't use toggles and their TD link pointers
Alan Stern10b8e472006-05-19 16:39:52 -0400323 * get adjusted during uhci_urb_dequeue(). But since their queues
324 * cannot truly be stopped, we have to watch out for dequeues
325 * occurring after the nominal unlink frame. */
326 if (qh->type == USB_ENDPOINT_XFER_ISOC) {
327 ret = (uhci->frame_number + uhci->is_stopped !=
328 qh->unlink_frame);
Alan Sternc5e3b742006-06-05 12:28:57 -0400329 goto done;
Alan Stern10b8e472006-05-19 16:39:52 -0400330 }
Alan Sterna0b458b2006-05-12 11:23:19 -0400331
332 /* If the URB isn't first on its queue, adjust the link pointer
333 * of the last TD in the previous URB. The toggle doesn't need
334 * to be saved since this URB can't be executing yet. */
335 if (qh->queue.next != &urbp->node) {
336 struct urb_priv *purbp;
337 struct uhci_td *ptd;
338
339 purbp = list_entry(urbp->node.prev, struct urb_priv, node);
340 WARN_ON(list_empty(&purbp->td_list));
341 ptd = list_entry(purbp->td_list.prev, struct uhci_td,
342 list);
343 td = list_entry(urbp->td_list.prev, struct uhci_td,
344 list);
345 ptd->link = td->link;
Alan Sternc5e3b742006-06-05 12:28:57 -0400346 goto done;
Alan Sterna0b458b2006-05-12 11:23:19 -0400347 }
348
Alan Stern0ed8fee2005-12-17 18:02:38 -0500349 /* If the QH element pointer is UHCI_PTR_TERM then then currently
350 * executing URB has already been unlinked, so this one isn't it. */
Jan Andersson51e2f622011-05-18 10:44:51 +0200351 if (qh_element(qh) == UHCI_PTR_TERM(uhci))
Alan Sternc5e3b742006-06-05 12:28:57 -0400352 goto done;
Jan Andersson51e2f622011-05-18 10:44:51 +0200353 qh->element = UHCI_PTR_TERM(uhci);
Alan Stern0ed8fee2005-12-17 18:02:38 -0500354
Alan Stern85a975d2007-01-08 12:01:43 -0500355 /* Control pipes don't have to worry about toggles */
Alan Sterna0b458b2006-05-12 11:23:19 -0400356 if (qh->type == USB_ENDPOINT_XFER_CONTROL)
Alan Sternc5e3b742006-06-05 12:28:57 -0400357 goto done;
Alan Stern0ed8fee2005-12-17 18:02:38 -0500358
Alan Sterna0b458b2006-05-12 11:23:19 -0400359 /* Save the next toggle value */
Alan Stern59e29ed2006-05-12 11:19:19 -0400360 WARN_ON(list_empty(&urbp->td_list));
361 td = list_entry(urbp->td_list.next, struct uhci_td, list);
362 qh->needs_fixup = 1;
Jan Andersson51e2f622011-05-18 10:44:51 +0200363 qh->initial_toggle = uhci_toggle(td_token(uhci, td));
Alan Sternc5e3b742006-06-05 12:28:57 -0400364
365done:
Alan Stern10b8e472006-05-19 16:39:52 -0400366 return ret;
Alan Stern0ed8fee2005-12-17 18:02:38 -0500367}
368
369/*
370 * Fix up the data toggles for URBs in a queue, when one of them
371 * terminates early (short transfer, error, or dequeued).
372 */
Jan Andersson51e2f622011-05-18 10:44:51 +0200373static void uhci_fixup_toggles(struct uhci_hcd *uhci, struct uhci_qh *qh,
374 int skip_first)
Alan Stern0ed8fee2005-12-17 18:02:38 -0500375{
376 struct urb_priv *urbp = NULL;
377 struct uhci_td *td;
378 unsigned int toggle = qh->initial_toggle;
379 unsigned int pipe;
380
381 /* Fixups for a short transfer start with the second URB in the
382 * queue (the short URB is the first). */
383 if (skip_first)
384 urbp = list_entry(qh->queue.next, struct urb_priv, node);
385
386 /* When starting with the first URB, if the QH element pointer is
387 * still valid then we know the URB's toggles are okay. */
Jan Andersson51e2f622011-05-18 10:44:51 +0200388 else if (qh_element(qh) != UHCI_PTR_TERM(uhci))
Alan Stern0ed8fee2005-12-17 18:02:38 -0500389 toggle = 2;
390
391 /* Fix up the toggle for the URBs in the queue. Normally this
392 * loop won't run more than once: When an error or short transfer
393 * occurs, the queue usually gets emptied. */
Alan Stern1393adb2006-01-31 10:02:55 -0500394 urbp = list_prepare_entry(urbp, &qh->queue, node);
Alan Stern0ed8fee2005-12-17 18:02:38 -0500395 list_for_each_entry_continue(urbp, &qh->queue, node) {
396
397 /* If the first TD has the right toggle value, we don't
398 * need to change any toggles in this URB */
399 td = list_entry(urbp->td_list.next, struct uhci_td, list);
Jan Andersson51e2f622011-05-18 10:44:51 +0200400 if (toggle > 1 || uhci_toggle(td_token(uhci, td)) == toggle) {
Alan Sterndb59b462006-08-31 14:18:39 -0400401 td = list_entry(urbp->td_list.prev, struct uhci_td,
Alan Stern0ed8fee2005-12-17 18:02:38 -0500402 list);
Jan Andersson51e2f622011-05-18 10:44:51 +0200403 toggle = uhci_toggle(td_token(uhci, td)) ^ 1;
Alan Stern0ed8fee2005-12-17 18:02:38 -0500404
405 /* Otherwise all the toggles in the URB have to be switched */
406 } else {
407 list_for_each_entry(td, &urbp->td_list, list) {
Jan Andersson51e2f622011-05-18 10:44:51 +0200408 td->token ^= cpu_to_hc32(uhci,
Alan Stern0ed8fee2005-12-17 18:02:38 -0500409 TD_TOKEN_TOGGLE);
410 toggle ^= 1;
411 }
412 }
413 }
414
415 wmb();
416 pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe;
417 usb_settoggle(qh->udev, usb_pipeendpoint(pipe),
418 usb_pipeout(pipe), toggle);
419 qh->needs_fixup = 0;
420}
421
422/*
Alan Stern17230ac2007-02-19 15:52:45 -0500423 * Link an Isochronous QH into its skeleton's list
424 */
425static inline void link_iso(struct uhci_hcd *uhci, struct uhci_qh *qh)
426{
427 list_add_tail(&qh->node, &uhci->skel_iso_qh->node);
428
429 /* Isochronous QHs aren't linked by the hardware */
430}
431
432/*
433 * Link a high-period interrupt QH into the schedule at the end of its
434 * skeleton's list
435 */
436static void link_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh)
437{
438 struct uhci_qh *pqh;
439
440 list_add_tail(&qh->node, &uhci->skelqh[qh->skel]->node);
441
442 pqh = list_entry(qh->node.prev, struct uhci_qh, node);
443 qh->link = pqh->link;
444 wmb();
Jan Andersson51e2f622011-05-18 10:44:51 +0200445 pqh->link = LINK_TO_QH(uhci, qh);
Alan Stern17230ac2007-02-19 15:52:45 -0500446}
447
448/*
449 * Link a period-1 interrupt or async QH into the schedule at the
450 * correct spot in the async skeleton's list, and update the FSBR link
451 */
452static void link_async(struct uhci_hcd *uhci, struct uhci_qh *qh)
453{
Alan Sterne009f1b2007-03-19 15:31:42 -0400454 struct uhci_qh *pqh;
Jan Andersson51e2f622011-05-18 10:44:51 +0200455 __hc32 link_to_new_qh;
Alan Stern17230ac2007-02-19 15:52:45 -0500456
457 /* Find the predecessor QH for our new one and insert it in the list.
458 * The list of QHs is expected to be short, so linear search won't
459 * take too long. */
460 list_for_each_entry_reverse(pqh, &uhci->skel_async_qh->node, node) {
461 if (pqh->skel <= qh->skel)
462 break;
463 }
464 list_add(&qh->node, &pqh->node);
Alan Stern17230ac2007-02-19 15:52:45 -0500465
466 /* Link it into the schedule */
Alan Sterne009f1b2007-03-19 15:31:42 -0400467 qh->link = pqh->link;
Alan Stern17230ac2007-02-19 15:52:45 -0500468 wmb();
Jan Andersson51e2f622011-05-18 10:44:51 +0200469 link_to_new_qh = LINK_TO_QH(uhci, qh);
Alan Sterne009f1b2007-03-19 15:31:42 -0400470 pqh->link = link_to_new_qh;
471
472 /* If this is now the first FSBR QH, link the terminating skeleton
473 * QH to it. */
474 if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR)
475 uhci->skel_term_qh->link = link_to_new_qh;
Alan Stern17230ac2007-02-19 15:52:45 -0500476}
477
478/*
Alan Sterndccf4a42005-12-17 17:58:46 -0500479 * Put a QH on the schedule in both hardware and software
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500481static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482{
Alan Sterndccf4a42005-12-17 17:58:46 -0500483 WARN_ON(list_empty(&qh->queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Alan Sterndccf4a42005-12-17 17:58:46 -0500485 /* Set the element pointer if it isn't set already.
486 * This isn't needed for Isochronous queues, but it doesn't hurt. */
Jan Andersson51e2f622011-05-18 10:44:51 +0200487 if (qh_element(qh) == UHCI_PTR_TERM(uhci)) {
Alan Sterndccf4a42005-12-17 17:58:46 -0500488 struct urb_priv *urbp = list_entry(qh->queue.next,
489 struct urb_priv, node);
490 struct uhci_td *td = list_entry(urbp->td_list.next,
491 struct uhci_td, list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Jan Andersson51e2f622011-05-18 10:44:51 +0200493 qh->element = LINK_TO_TD(uhci, td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
495
Alan Stern84afddd2006-05-12 11:35:45 -0400496 /* Treat the queue as if it has just advanced */
497 qh->wait_expired = 0;
498 qh->advance_jiffies = jiffies;
499
Alan Sterndccf4a42005-12-17 17:58:46 -0500500 if (qh->state == QH_STATE_ACTIVE)
501 return;
502 qh->state = QH_STATE_ACTIVE;
503
Alan Stern17230ac2007-02-19 15:52:45 -0500504 /* Move the QH from its old list to the correct spot in the appropriate
Alan Sterndccf4a42005-12-17 17:58:46 -0500505 * skeleton's list */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500506 if (qh == uhci->next_qh)
507 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
508 node);
Alan Stern17230ac2007-02-19 15:52:45 -0500509 list_del(&qh->node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500510
Alan Stern17230ac2007-02-19 15:52:45 -0500511 if (qh->skel == SKEL_ISO)
512 link_iso(uhci, qh);
513 else if (qh->skel < SKEL_ASYNC)
514 link_interrupt(uhci, qh);
515 else
516 link_async(uhci, qh);
517}
518
519/*
520 * Unlink a high-period interrupt QH from the schedule
521 */
522static void unlink_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh)
523{
524 struct uhci_qh *pqh;
525
Alan Sterndccf4a42005-12-17 17:58:46 -0500526 pqh = list_entry(qh->node.prev, struct uhci_qh, node);
Alan Stern17230ac2007-02-19 15:52:45 -0500527 pqh->link = qh->link;
528 mb();
529}
530
531/*
532 * Unlink a period-1 interrupt or async QH from the schedule
533 */
534static void unlink_async(struct uhci_hcd *uhci, struct uhci_qh *qh)
535{
Alan Sterne009f1b2007-03-19 15:31:42 -0400536 struct uhci_qh *pqh;
Jan Andersson51e2f622011-05-18 10:44:51 +0200537 __hc32 link_to_next_qh = qh->link;
Alan Stern17230ac2007-02-19 15:52:45 -0500538
539 pqh = list_entry(qh->node.prev, struct uhci_qh, node);
Alan Stern17230ac2007-02-19 15:52:45 -0500540 pqh->link = link_to_next_qh;
Alan Sterne009f1b2007-03-19 15:31:42 -0400541
542 /* If this was the old first FSBR QH, link the terminating skeleton
543 * QH to the next (new first FSBR) QH. */
544 if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR)
545 uhci->skel_term_qh->link = link_to_next_qh;
Alan Stern17230ac2007-02-19 15:52:45 -0500546 mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547}
548
549/*
Alan Sterndccf4a42005-12-17 17:58:46 -0500550 * Take a QH off the hardware schedule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500552static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553{
Alan Sterndccf4a42005-12-17 17:58:46 -0500554 if (qh->state == QH_STATE_UNLINKING)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 return;
Alan Sterndccf4a42005-12-17 17:58:46 -0500556 WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev);
557 qh->state = QH_STATE_UNLINKING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Alan Sterndccf4a42005-12-17 17:58:46 -0500559 /* Unlink the QH from the schedule and record when we did it */
Alan Stern17230ac2007-02-19 15:52:45 -0500560 if (qh->skel == SKEL_ISO)
561 ;
562 else if (qh->skel < SKEL_ASYNC)
563 unlink_interrupt(uhci, qh);
564 else
565 unlink_async(uhci, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567 uhci_get_current_frame_number(uhci);
Alan Sterndccf4a42005-12-17 17:58:46 -0500568 qh->unlink_frame = uhci->frame_number;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Alan Sterndccf4a42005-12-17 17:58:46 -0500570 /* Force an interrupt so we know when the QH is fully unlinked */
Alan Sternba297ed2010-06-09 17:34:39 -0400571 if (list_empty(&uhci->skel_unlink_qh->node) || uhci->is_stopped)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 uhci_set_next_interrupt(uhci);
573
Alan Sterndccf4a42005-12-17 17:58:46 -0500574 /* Move the QH from its old list to the end of the unlinking list */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500575 if (qh == uhci->next_qh)
576 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
577 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500578 list_move_tail(&qh->node, &uhci->skel_unlink_qh->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579}
580
Alan Sterndccf4a42005-12-17 17:58:46 -0500581/*
582 * When we and the controller are through with a QH, it becomes IDLE.
583 * This happens when a QH has been off the schedule (on the unlinking
584 * list) for more than one frame, or when an error occurs while adding
585 * the first URB onto a new QH.
586 */
587static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588{
Alan Sterndccf4a42005-12-17 17:58:46 -0500589 WARN_ON(qh->state == QH_STATE_ACTIVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
Alan Stern0ed8fee2005-12-17 18:02:38 -0500591 if (qh == uhci->next_qh)
592 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
593 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500594 list_move(&qh->node, &uhci->idle_qh_list);
595 qh->state = QH_STATE_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Alan Stern59e29ed2006-05-12 11:19:19 -0400597 /* Now that the QH is idle, its post_td isn't being used */
598 if (qh->post_td) {
599 uhci_free_td(uhci, qh->post_td);
600 qh->post_td = NULL;
601 }
602
Alan Sterndccf4a42005-12-17 17:58:46 -0500603 /* If anyone is waiting for a QH to become idle, wake them up */
604 if (uhci->num_waiting)
605 wake_up_all(&uhci->waitqh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606}
607
Alan Stern3ca2a322007-01-16 11:56:32 -0500608/*
609 * Find the highest existing bandwidth load for a given phase and period.
610 */
611static int uhci_highest_load(struct uhci_hcd *uhci, int phase, int period)
612{
613 int highest_load = uhci->load[phase];
614
615 for (phase += period; phase < MAX_PHASE; phase += period)
616 highest_load = max_t(int, highest_load, uhci->load[phase]);
617 return highest_load;
618}
619
620/*
621 * Set qh->phase to the optimal phase for a periodic transfer and
622 * check whether the bandwidth requirement is acceptable.
623 */
624static int uhci_check_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh)
625{
626 int minimax_load;
627
628 /* Find the optimal phase (unless it is already set) and get
629 * its load value. */
630 if (qh->phase >= 0)
631 minimax_load = uhci_highest_load(uhci, qh->phase, qh->period);
632 else {
633 int phase, load;
634 int max_phase = min_t(int, MAX_PHASE, qh->period);
635
636 qh->phase = 0;
637 minimax_load = uhci_highest_load(uhci, qh->phase, qh->period);
638 for (phase = 1; phase < max_phase; ++phase) {
639 load = uhci_highest_load(uhci, phase, qh->period);
640 if (load < minimax_load) {
641 minimax_load = load;
642 qh->phase = phase;
643 }
644 }
645 }
646
647 /* Maximum allowable periodic bandwidth is 90%, or 900 us per frame */
648 if (minimax_load + qh->load > 900) {
649 dev_dbg(uhci_dev(uhci), "bandwidth allocation failed: "
650 "period %d, phase %d, %d + %d us\n",
651 qh->period, qh->phase, minimax_load, qh->load);
652 return -ENOSPC;
653 }
654 return 0;
655}
656
657/*
658 * Reserve a periodic QH's bandwidth in the schedule
659 */
660static void uhci_reserve_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh)
661{
662 int i;
663 int load = qh->load;
664 char *p = "??";
665
666 for (i = qh->phase; i < MAX_PHASE; i += qh->period) {
667 uhci->load[i] += load;
668 uhci->total_load += load;
669 }
670 uhci_to_hcd(uhci)->self.bandwidth_allocated =
671 uhci->total_load / MAX_PHASE;
672 switch (qh->type) {
673 case USB_ENDPOINT_XFER_INT:
674 ++uhci_to_hcd(uhci)->self.bandwidth_int_reqs;
675 p = "INT";
676 break;
677 case USB_ENDPOINT_XFER_ISOC:
678 ++uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs;
679 p = "ISO";
680 break;
681 }
682 qh->bandwidth_reserved = 1;
683 dev_dbg(uhci_dev(uhci),
684 "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n",
685 "reserve", qh->udev->devnum,
686 qh->hep->desc.bEndpointAddress, p,
687 qh->period, qh->phase, load);
688}
689
690/*
691 * Release a periodic QH's bandwidth reservation
692 */
693static void uhci_release_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh)
694{
695 int i;
696 int load = qh->load;
697 char *p = "??";
698
699 for (i = qh->phase; i < MAX_PHASE; i += qh->period) {
700 uhci->load[i] -= load;
701 uhci->total_load -= load;
702 }
703 uhci_to_hcd(uhci)->self.bandwidth_allocated =
704 uhci->total_load / MAX_PHASE;
705 switch (qh->type) {
706 case USB_ENDPOINT_XFER_INT:
707 --uhci_to_hcd(uhci)->self.bandwidth_int_reqs;
708 p = "INT";
709 break;
710 case USB_ENDPOINT_XFER_ISOC:
711 --uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs;
712 p = "ISO";
713 break;
714 }
715 qh->bandwidth_reserved = 0;
716 dev_dbg(uhci_dev(uhci),
717 "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n",
718 "release", qh->udev->devnum,
719 qh->hep->desc.bEndpointAddress, p,
720 qh->period, qh->phase, load);
721}
722
Alan Sterndccf4a42005-12-17 17:58:46 -0500723static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci,
724 struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725{
726 struct urb_priv *urbp;
727
Robert P. J. Dayc3762222007-02-10 01:45:03 -0800728 urbp = kmem_cache_zalloc(uhci_up_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 if (!urbp)
730 return NULL;
731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 urbp->urb = urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 urb->hcpriv = urbp;
Tobias Ollmann16325f12010-12-09 14:24:27 +0100734
Alan Sterndccf4a42005-12-17 17:58:46 -0500735 INIT_LIST_HEAD(&urbp->node);
736 INIT_LIST_HEAD(&urbp->td_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738 return urbp;
739}
740
Alan Sterndccf4a42005-12-17 17:58:46 -0500741static void uhci_free_urb_priv(struct uhci_hcd *uhci,
742 struct urb_priv *urbp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
744 struct uhci_td *td, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Arjan van de Ven51720462008-09-20 19:09:37 -0700746 if (!list_empty(&urbp->node))
747 dev_WARN(uhci_dev(uhci), "urb %p still on QH's list!\n",
Alan Sterndccf4a42005-12-17 17:58:46 -0500748 urbp->urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
Alan Stern04538a22006-05-12 11:29:04 -0400751 uhci_remove_td_from_urbp(td);
752 uhci_free_td(uhci, td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 }
754
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 kmem_cache_free(uhci_up_cachep, urbp);
756}
757
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758/*
759 * Map status to standard result codes
760 *
Jan Andersson51e2f622011-05-18 10:44:51 +0200761 * <status> is (td_status(uhci, td) & 0xF60000), a.k.a.
762 * uhci_status_bits(td_status(uhci, td)).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 * Note: <status> does not include the TD_CTRL_NAK bit.
764 * <dir_out> is True for output TDs and False for input TDs.
765 */
766static int uhci_map_status(int status, int dir_out)
767{
768 if (!status)
769 return 0;
770 if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */
771 return -EPROTO;
772 if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */
773 if (dir_out)
774 return -EPROTO;
775 else
776 return -EILSEQ;
777 }
778 if (status & TD_CTRL_BABBLE) /* Babble */
779 return -EOVERFLOW;
780 if (status & TD_CTRL_DBUFERR) /* Buffer error */
781 return -ENOSR;
782 if (status & TD_CTRL_STALLED) /* Stalled */
783 return -EPIPE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 return 0;
785}
786
787/*
788 * Control transfers
789 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500790static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
791 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 struct uhci_td *td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 unsigned long destination, status;
Kuninori Morimoto29cc8892011-08-23 03:12:03 -0700795 int maxsze = usb_endpoint_maxp(&qh->hep->desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 int len = urb->transfer_buffer_length;
797 dma_addr_t data = urb->transfer_dma;
Jan Andersson51e2f622011-05-18 10:44:51 +0200798 __hc32 *plink;
Alan Stern04538a22006-05-12 11:29:04 -0400799 struct urb_priv *urbp = urb->hcpriv;
Alan Stern17230ac2007-02-19 15:52:45 -0500800 int skel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
802 /* The "pipe" thing contains the destination in bits 8--18 */
803 destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
804
Alan Sternaf0bb592005-12-17 18:00:12 -0500805 /* 3 errors, dummy TD remains inactive */
806 status = uhci_maxerr(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 if (urb->dev->speed == USB_SPEED_LOW)
808 status |= TD_CTRL_LS;
809
810 /*
811 * Build the TD for the control request setup packet
812 */
Alan Sternaf0bb592005-12-17 18:00:12 -0500813 td = qh->dummy_td;
Alan Stern04538a22006-05-12 11:29:04 -0400814 uhci_add_td_to_urbp(td, urbp);
Jan Andersson51e2f622011-05-18 10:44:51 +0200815 uhci_fill_td(uhci, td, status, destination | uhci_explen(8),
Alan Sterndccf4a42005-12-17 17:58:46 -0500816 urb->setup_dma);
817 plink = &td->link;
Alan Sternaf0bb592005-12-17 18:00:12 -0500818 status |= TD_CTRL_ACTIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 /*
821 * If direction is "send", change the packet ID from SETUP (0x2D)
822 * to OUT (0xE1). Else change it from SETUP to IN (0x69) and
823 * set Short Packet Detect (SPD) for all data packets.
Alan Sterne7e7c362007-07-13 15:46:29 -0400824 *
825 * 0-length transfers always get treated as "send".
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 */
Alan Sterne7e7c362007-07-13 15:46:29 -0400827 if (usb_pipeout(urb->pipe) || len == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 destination ^= (USB_PID_SETUP ^ USB_PID_OUT);
829 else {
830 destination ^= (USB_PID_SETUP ^ USB_PID_IN);
831 status |= TD_CTRL_SPD;
832 }
833
834 /*
Alan Stern687f5f32005-11-30 17:16:19 -0500835 * Build the DATA TDs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 */
837 while (len > 0) {
Alan Sterne7e7c362007-07-13 15:46:29 -0400838 int pktsze = maxsze;
839
840 if (len <= pktsze) { /* The last data packet */
841 pktsze = len;
842 status &= ~TD_CTRL_SPD;
843 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
Alan Stern25321782005-04-25 11:14:31 -0400845 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500847 goto nomem;
Jan Andersson51e2f622011-05-18 10:44:51 +0200848 *plink = LINK_TO_TD(uhci, td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
850 /* Alternate Data0/1 (start with Data1) */
851 destination ^= TD_TOKEN_TOGGLE;
Tobias Ollmann16325f12010-12-09 14:24:27 +0100852
Alan Stern04538a22006-05-12 11:29:04 -0400853 uhci_add_td_to_urbp(td, urbp);
Jan Andersson51e2f622011-05-18 10:44:51 +0200854 uhci_fill_td(uhci, td, status,
855 destination | uhci_explen(pktsze), data);
Alan Sterndccf4a42005-12-17 17:58:46 -0500856 plink = &td->link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 data += pktsze;
859 len -= pktsze;
860 }
861
862 /*
Tobias Ollmann16325f12010-12-09 14:24:27 +0100863 * Build the final TD for control status
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 */
Alan Stern25321782005-04-25 11:14:31 -0400865 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500867 goto nomem;
Jan Andersson51e2f622011-05-18 10:44:51 +0200868 *plink = LINK_TO_TD(uhci, td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Alan Sterne7e7c362007-07-13 15:46:29 -0400870 /* Change direction for the status transaction */
871 destination ^= (USB_PID_IN ^ USB_PID_OUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 destination |= TD_TOKEN_TOGGLE; /* End in Data1 */
873
Alan Stern04538a22006-05-12 11:29:04 -0400874 uhci_add_td_to_urbp(td, urbp);
Jan Andersson51e2f622011-05-18 10:44:51 +0200875 uhci_fill_td(uhci, td, status | TD_CTRL_IOC,
Alan Sterndccf4a42005-12-17 17:58:46 -0500876 destination | uhci_explen(0), 0);
Alan Sternaf0bb592005-12-17 18:00:12 -0500877 plink = &td->link;
878
879 /*
880 * Build the new dummy TD and activate the old one
881 */
882 td = uhci_alloc_td(uhci);
883 if (!td)
884 goto nomem;
Jan Andersson51e2f622011-05-18 10:44:51 +0200885 *plink = LINK_TO_TD(uhci, td);
Alan Sternaf0bb592005-12-17 18:00:12 -0500886
Jan Andersson51e2f622011-05-18 10:44:51 +0200887 uhci_fill_td(uhci, td, 0, USB_PID_OUT | uhci_explen(0), 0);
Alan Sternaf0bb592005-12-17 18:00:12 -0500888 wmb();
Jan Andersson51e2f622011-05-18 10:44:51 +0200889 qh->dummy_td->status |= cpu_to_hc32(uhci, TD_CTRL_ACTIVE);
Alan Sternaf0bb592005-12-17 18:00:12 -0500890 qh->dummy_td = td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
892 /* Low-speed transfers get a different queue, and won't hog the bus.
893 * Also, some devices enumerate better without FSBR; the easiest way
894 * to do that is to put URBs on the low-speed queue while the device
Alan Stern630aa3c2006-01-23 17:17:21 -0500895 * isn't in the CONFIGURED state. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 if (urb->dev->speed == USB_SPEED_LOW ||
Alan Stern630aa3c2006-01-23 17:17:21 -0500897 urb->dev->state != USB_STATE_CONFIGURED)
Alan Stern17230ac2007-02-19 15:52:45 -0500898 skel = SKEL_LS_CONTROL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 else {
Alan Stern17230ac2007-02-19 15:52:45 -0500900 skel = SKEL_FS_CONTROL;
Alan Stern84afddd2006-05-12 11:35:45 -0400901 uhci_add_fsbr(uhci, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 }
Alan Stern17230ac2007-02-19 15:52:45 -0500903 if (qh->state != QH_STATE_ACTIVE)
904 qh->skel = skel;
Alan Sterndccf4a42005-12-17 17:58:46 -0500905 return 0;
Alan Sternaf0bb592005-12-17 18:00:12 -0500906
907nomem:
908 /* Remove the dummy TD from the td_list so it doesn't get freed */
Alan Stern04538a22006-05-12 11:29:04 -0400909 uhci_remove_td_from_urbp(qh->dummy_td);
Alan Sternaf0bb592005-12-17 18:00:12 -0500910 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911}
912
913/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 * Common submit for bulk and interrupt
915 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500916static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
917 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918{
919 struct uhci_td *td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 unsigned long destination, status;
Kuninori Morimoto29cc8892011-08-23 03:12:03 -0700921 int maxsze = usb_endpoint_maxp(&qh->hep->desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 int len = urb->transfer_buffer_length;
Ming Lei689d6ea2010-09-30 20:32:44 +0800923 int this_sg_len;
924 dma_addr_t data;
Jan Andersson51e2f622011-05-18 10:44:51 +0200925 __hc32 *plink;
Alan Stern04538a22006-05-12 11:29:04 -0400926 struct urb_priv *urbp = urb->hcpriv;
Alan Sternaf0bb592005-12-17 18:00:12 -0500927 unsigned int toggle;
Ming Lei689d6ea2010-09-30 20:32:44 +0800928 struct scatterlist *sg;
929 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
931 if (len < 0)
932 return -EINVAL;
933
934 /* The "pipe" thing contains the destination in bits 8--18 */
935 destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
Alan Sternaf0bb592005-12-17 18:00:12 -0500936 toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
937 usb_pipeout(urb->pipe));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
Alan Sternaf0bb592005-12-17 18:00:12 -0500939 /* 3 errors, dummy TD remains inactive */
940 status = uhci_maxerr(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 if (urb->dev->speed == USB_SPEED_LOW)
942 status |= TD_CTRL_LS;
943 if (usb_pipein(urb->pipe))
944 status |= TD_CTRL_SPD;
945
Clemens Ladischbc677d52011-12-03 23:41:31 +0100946 i = urb->num_mapped_sgs;
Ming Lei689d6ea2010-09-30 20:32:44 +0800947 if (len > 0 && i > 0) {
948 sg = urb->sg;
949 data = sg_dma_address(sg);
950
951 /* urb->transfer_buffer_length may be smaller than the
952 * size of the scatterlist (or vice versa)
953 */
954 this_sg_len = min_t(int, sg_dma_len(sg), len);
955 } else {
956 sg = NULL;
957 data = urb->transfer_dma;
958 this_sg_len = len;
959 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 /*
Alan Stern687f5f32005-11-30 17:16:19 -0500961 * Build the DATA TDs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 */
Alan Sternaf0bb592005-12-17 18:00:12 -0500963 plink = NULL;
964 td = qh->dummy_td;
Ming Lei689d6ea2010-09-30 20:32:44 +0800965 for (;;) { /* Allow zero length packets */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 int pktsze = maxsze;
967
Alan Sterndccf4a42005-12-17 17:58:46 -0500968 if (len <= pktsze) { /* The last packet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 pktsze = len;
970 if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
971 status &= ~TD_CTRL_SPD;
972 }
973
Alan Sternaf0bb592005-12-17 18:00:12 -0500974 if (plink) {
975 td = uhci_alloc_td(uhci);
976 if (!td)
977 goto nomem;
Jan Andersson51e2f622011-05-18 10:44:51 +0200978 *plink = LINK_TO_TD(uhci, td);
Alan Sternaf0bb592005-12-17 18:00:12 -0500979 }
Alan Stern04538a22006-05-12 11:29:04 -0400980 uhci_add_td_to_urbp(td, urbp);
Jan Andersson51e2f622011-05-18 10:44:51 +0200981 uhci_fill_td(uhci, td, status,
Alan Sternaf0bb592005-12-17 18:00:12 -0500982 destination | uhci_explen(pktsze) |
983 (toggle << TD_TOKEN_TOGGLE_SHIFT),
984 data);
Alan Sterndccf4a42005-12-17 17:58:46 -0500985 plink = &td->link;
Alan Sternaf0bb592005-12-17 18:00:12 -0500986 status |= TD_CTRL_ACTIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Alan Sternaf0bb592005-12-17 18:00:12 -0500988 toggle ^= 1;
Ming Lei689d6ea2010-09-30 20:32:44 +0800989 data += pktsze;
990 this_sg_len -= pktsze;
991 len -= maxsze;
992 if (this_sg_len <= 0) {
993 if (--i <= 0 || len <= 0)
994 break;
995 sg = sg_next(sg);
996 data = sg_dma_address(sg);
997 this_sg_len = min_t(int, sg_dma_len(sg), len);
998 }
999 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
1001 /*
1002 * URB_ZERO_PACKET means adding a 0-length packet, if direction
1003 * is OUT and the transfer_length was an exact multiple of maxsze,
1004 * hence (len = transfer_length - N * maxsze) == 0
1005 * however, if transfer_length == 0, the zero packet was already
1006 * prepared above.
1007 */
Alan Sterndccf4a42005-12-17 17:58:46 -05001008 if ((urb->transfer_flags & URB_ZERO_PACKET) &&
1009 usb_pipeout(urb->pipe) && len == 0 &&
1010 urb->transfer_buffer_length > 0) {
Alan Stern25321782005-04-25 11:14:31 -04001011 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -05001013 goto nomem;
Jan Andersson51e2f622011-05-18 10:44:51 +02001014 *plink = LINK_TO_TD(uhci, td);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Alan Stern04538a22006-05-12 11:29:04 -04001016 uhci_add_td_to_urbp(td, urbp);
Jan Andersson51e2f622011-05-18 10:44:51 +02001017 uhci_fill_td(uhci, td, status,
Alan Sternaf0bb592005-12-17 18:00:12 -05001018 destination | uhci_explen(0) |
1019 (toggle << TD_TOKEN_TOGGLE_SHIFT),
1020 data);
1021 plink = &td->link;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Alan Sternaf0bb592005-12-17 18:00:12 -05001023 toggle ^= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 }
1025
1026 /* Set the interrupt-on-completion flag on the last packet.
1027 * A more-or-less typical 4 KB URB (= size of one memory page)
1028 * will require about 3 ms to transfer; that's a little on the
1029 * fast side but not enough to justify delaying an interrupt
1030 * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
1031 * flag setting. */
Jan Andersson51e2f622011-05-18 10:44:51 +02001032 td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
Alan Sternaf0bb592005-12-17 18:00:12 -05001034 /*
1035 * Build the new dummy TD and activate the old one
1036 */
1037 td = uhci_alloc_td(uhci);
1038 if (!td)
1039 goto nomem;
Jan Andersson51e2f622011-05-18 10:44:51 +02001040 *plink = LINK_TO_TD(uhci, td);
Alan Sternaf0bb592005-12-17 18:00:12 -05001041
Jan Andersson51e2f622011-05-18 10:44:51 +02001042 uhci_fill_td(uhci, td, 0, USB_PID_OUT | uhci_explen(0), 0);
Alan Sternaf0bb592005-12-17 18:00:12 -05001043 wmb();
Jan Andersson51e2f622011-05-18 10:44:51 +02001044 qh->dummy_td->status |= cpu_to_hc32(uhci, TD_CTRL_ACTIVE);
Alan Sternaf0bb592005-12-17 18:00:12 -05001045 qh->dummy_td = td;
1046
1047 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1048 usb_pipeout(urb->pipe), toggle);
Alan Sterndccf4a42005-12-17 17:58:46 -05001049 return 0;
Alan Sternaf0bb592005-12-17 18:00:12 -05001050
1051nomem:
1052 /* Remove the dummy TD from the td_list so it doesn't get freed */
Alan Stern04538a22006-05-12 11:29:04 -04001053 uhci_remove_td_from_urbp(qh->dummy_td);
Alan Sternaf0bb592005-12-17 18:00:12 -05001054 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}
1056
Alan Stern17230ac2007-02-19 15:52:45 -05001057static int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb,
Alan Sterndccf4a42005-12-17 17:58:46 -05001058 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059{
1060 int ret;
1061
1062 /* Can't have low-speed bulk transfers */
1063 if (urb->dev->speed == USB_SPEED_LOW)
1064 return -EINVAL;
1065
Alan Stern17230ac2007-02-19 15:52:45 -05001066 if (qh->state != QH_STATE_ACTIVE)
1067 qh->skel = SKEL_BULK;
Alan Sterndccf4a42005-12-17 17:58:46 -05001068 ret = uhci_submit_common(uhci, urb, qh);
1069 if (ret == 0)
Alan Stern84afddd2006-05-12 11:35:45 -04001070 uhci_add_fsbr(uhci, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 return ret;
1072}
1073
Alan Sterncaf38272006-05-19 16:44:55 -04001074static int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb,
Alan Sterndccf4a42005-12-17 17:58:46 -05001075 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076{
Alan Stern3ca2a322007-01-16 11:56:32 -05001077 int ret;
Alan Sterncaf38272006-05-19 16:44:55 -04001078
Alan Sterndccf4a42005-12-17 17:58:46 -05001079 /* USB 1.1 interrupt transfers only involve one packet per interval.
1080 * Drivers can submit URBs of any length, but longer ones will need
1081 * multiple intervals to complete.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 */
Alan Sterncaf38272006-05-19 16:44:55 -04001083
Alan Stern3ca2a322007-01-16 11:56:32 -05001084 if (!qh->bandwidth_reserved) {
1085 int exponent;
Alan Sterncaf38272006-05-19 16:44:55 -04001086
Alan Stern3ca2a322007-01-16 11:56:32 -05001087 /* Figure out which power-of-two queue to use */
1088 for (exponent = 7; exponent >= 0; --exponent) {
1089 if ((1 << exponent) <= urb->interval)
1090 break;
1091 }
1092 if (exponent < 0)
1093 return -EINVAL;
Alan Sterncaf38272006-05-19 16:44:55 -04001094
Alan Sterne58dceb2008-09-25 16:59:57 -04001095 /* If the slot is full, try a lower period */
1096 do {
1097 qh->period = 1 << exponent;
1098 qh->skel = SKEL_INDEX(exponent);
1099
1100 /* For now, interrupt phase is fixed by the layout
1101 * of the QH lists.
1102 */
1103 qh->phase = (qh->period / 2) & (MAX_PHASE - 1);
1104 ret = uhci_check_bandwidth(uhci, qh);
1105 } while (ret != 0 && --exponent >= 0);
Alan Stern3ca2a322007-01-16 11:56:32 -05001106 if (ret)
1107 return ret;
1108 } else if (qh->period > urb->interval)
1109 return -EINVAL; /* Can't decrease the period */
1110
1111 ret = uhci_submit_common(uhci, urb, qh);
1112 if (ret == 0) {
1113 urb->interval = qh->period;
1114 if (!qh->bandwidth_reserved)
1115 uhci_reserve_bandwidth(uhci, qh);
1116 }
1117 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118}
1119
1120/*
Alan Sternb1869002006-05-12 11:14:25 -04001121 * Fix up the data structures following a short transfer
1122 */
1123static int uhci_fixup_short_transfer(struct uhci_hcd *uhci,
Alan Stern59e29ed2006-05-12 11:19:19 -04001124 struct uhci_qh *qh, struct urb_priv *urbp)
Alan Sternb1869002006-05-12 11:14:25 -04001125{
1126 struct uhci_td *td;
Alan Stern59e29ed2006-05-12 11:19:19 -04001127 struct list_head *tmp;
1128 int ret;
Alan Sternb1869002006-05-12 11:14:25 -04001129
1130 td = list_entry(urbp->td_list.prev, struct uhci_td, list);
1131 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
Alan Sternb1869002006-05-12 11:14:25 -04001132
1133 /* When a control transfer is short, we have to restart
1134 * the queue at the status stage transaction, which is
1135 * the last TD. */
Alan Stern59e29ed2006-05-12 11:19:19 -04001136 WARN_ON(list_empty(&urbp->td_list));
Jan Andersson51e2f622011-05-18 10:44:51 +02001137 qh->element = LINK_TO_TD(uhci, td);
Alan Stern59e29ed2006-05-12 11:19:19 -04001138 tmp = td->list.prev;
Alan Sternb1869002006-05-12 11:14:25 -04001139 ret = -EINPROGRESS;
1140
Alan Stern59e29ed2006-05-12 11:19:19 -04001141 } else {
Alan Sternb1869002006-05-12 11:14:25 -04001142
1143 /* When a bulk/interrupt transfer is short, we have to
1144 * fix up the toggles of the following URBs on the queue
1145 * before restarting the queue at the next URB. */
Jan Andersson51e2f622011-05-18 10:44:51 +02001146 qh->initial_toggle =
1147 uhci_toggle(td_token(uhci, qh->post_td)) ^ 1;
1148 uhci_fixup_toggles(uhci, qh, 1);
Alan Sternb1869002006-05-12 11:14:25 -04001149
Alan Stern59e29ed2006-05-12 11:19:19 -04001150 if (list_empty(&urbp->td_list))
1151 td = qh->post_td;
Alan Sternb1869002006-05-12 11:14:25 -04001152 qh->element = td->link;
Alan Stern59e29ed2006-05-12 11:19:19 -04001153 tmp = urbp->td_list.prev;
1154 ret = 0;
Alan Sternb1869002006-05-12 11:14:25 -04001155 }
1156
Alan Stern59e29ed2006-05-12 11:19:19 -04001157 /* Remove all the TDs we skipped over, from tmp back to the start */
1158 while (tmp != &urbp->td_list) {
1159 td = list_entry(tmp, struct uhci_td, list);
1160 tmp = tmp->prev;
1161
Alan Stern04538a22006-05-12 11:29:04 -04001162 uhci_remove_td_from_urbp(td);
1163 uhci_free_td(uhci, td);
Alan Stern59e29ed2006-05-12 11:19:19 -04001164 }
Alan Sternb1869002006-05-12 11:14:25 -04001165 return ret;
1166}
1167
1168/*
1169 * Common result for control, bulk, and interrupt
1170 */
1171static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
1172{
1173 struct urb_priv *urbp = urb->hcpriv;
1174 struct uhci_qh *qh = urbp->qh;
Alan Stern59e29ed2006-05-12 11:19:19 -04001175 struct uhci_td *td, *tmp;
Alan Sternb1869002006-05-12 11:14:25 -04001176 unsigned status;
1177 int ret = 0;
1178
Alan Stern59e29ed2006-05-12 11:19:19 -04001179 list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
Alan Sternb1869002006-05-12 11:14:25 -04001180 unsigned int ctrlstat;
1181 int len;
1182
Jan Andersson51e2f622011-05-18 10:44:51 +02001183 ctrlstat = td_status(uhci, td);
Alan Sternb1869002006-05-12 11:14:25 -04001184 status = uhci_status_bits(ctrlstat);
1185 if (status & TD_CTRL_ACTIVE)
1186 return -EINPROGRESS;
1187
1188 len = uhci_actual_length(ctrlstat);
1189 urb->actual_length += len;
1190
1191 if (status) {
1192 ret = uhci_map_status(status,
Jan Andersson51e2f622011-05-18 10:44:51 +02001193 uhci_packetout(td_token(uhci, td)));
Alan Sternb1869002006-05-12 11:14:25 -04001194 if ((debug == 1 && ret != -EPIPE) || debug > 1) {
1195 /* Some debugging code */
David Brownellbe3cbc52006-06-05 12:16:39 -04001196 dev_dbg(&urb->dev->dev,
Alan Sternb1869002006-05-12 11:14:25 -04001197 "%s: failed with status %x\n",
Harvey Harrison441b62c2008-03-03 16:08:34 -08001198 __func__, status);
Alan Sternb1869002006-05-12 11:14:25 -04001199
1200 if (debug > 1 && errbuf) {
1201 /* Print the chain for debugging */
Alan Sterne009f1b2007-03-19 15:31:42 -04001202 uhci_show_qh(uhci, urbp->qh, errbuf,
Chen Gang13996ca2013-01-23 16:13:41 +08001203 ERRBUF_LEN - EXTRA_SPACE, 0);
Alan Sternb1869002006-05-12 11:14:25 -04001204 lprintk(errbuf);
1205 }
1206 }
1207
Alan Sterne7e7c362007-07-13 15:46:29 -04001208 /* Did we receive a short packet? */
Jan Andersson51e2f622011-05-18 10:44:51 +02001209 } else if (len < uhci_expected_length(td_token(uhci, td))) {
Alan Sternb1869002006-05-12 11:14:25 -04001210
Alan Sterne7e7c362007-07-13 15:46:29 -04001211 /* For control transfers, go to the status TD if
1212 * this isn't already the last data TD */
1213 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1214 if (td->list.next != urbp->td_list.prev)
1215 ret = 1;
1216 }
1217
1218 /* For bulk and interrupt, this may be an error */
1219 else if (urb->transfer_flags & URB_SHORT_NOT_OK)
Alan Sternb1869002006-05-12 11:14:25 -04001220 ret = -EREMOTEIO;
Alan Sternf443ddf2006-07-31 10:16:24 -04001221
1222 /* Fixup needed only if this isn't the URB's last TD */
1223 else if (&td->list != urbp->td_list.prev)
Alan Sternb1869002006-05-12 11:14:25 -04001224 ret = 1;
1225 }
1226
Alan Stern04538a22006-05-12 11:29:04 -04001227 uhci_remove_td_from_urbp(td);
Alan Stern59e29ed2006-05-12 11:19:19 -04001228 if (qh->post_td)
Alan Stern04538a22006-05-12 11:29:04 -04001229 uhci_free_td(uhci, qh->post_td);
Alan Stern59e29ed2006-05-12 11:19:19 -04001230 qh->post_td = td;
1231
Alan Sternb1869002006-05-12 11:14:25 -04001232 if (ret != 0)
1233 goto err;
1234 }
1235 return ret;
1236
1237err:
1238 if (ret < 0) {
Alan Sternb1869002006-05-12 11:14:25 -04001239 /* Note that the queue has stopped and save
1240 * the next toggle value */
Jan Andersson51e2f622011-05-18 10:44:51 +02001241 qh->element = UHCI_PTR_TERM(uhci);
Alan Sternb1869002006-05-12 11:14:25 -04001242 qh->is_stopped = 1;
1243 qh->needs_fixup = (qh->type != USB_ENDPOINT_XFER_CONTROL);
Jan Andersson51e2f622011-05-18 10:44:51 +02001244 qh->initial_toggle = uhci_toggle(td_token(uhci, td)) ^
Alan Sternb1869002006-05-12 11:14:25 -04001245 (ret == -EREMOTEIO);
1246
1247 } else /* Short packet received */
Alan Stern59e29ed2006-05-12 11:19:19 -04001248 ret = uhci_fixup_short_transfer(uhci, qh, urbp);
Alan Sternb1869002006-05-12 11:14:25 -04001249 return ret;
1250}
1251
1252/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 * Isochronous transfers
1254 */
Alan Sterndccf4a42005-12-17 17:58:46 -05001255static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb,
1256 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257{
Alan Sterndccf4a42005-12-17 17:58:46 -05001258 struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */
Alan Sternc44b2252012-10-01 10:32:09 -04001259 int i;
1260 unsigned frame, next;
Alan Sterndccf4a42005-12-17 17:58:46 -05001261 unsigned long destination, status;
Alan Sternb81d3432005-10-13 17:00:24 -04001262 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263
Alan Sterncaf38272006-05-19 16:44:55 -04001264 /* Values must not be too big (could overflow below) */
1265 if (urb->interval >= UHCI_NUMFRAMES ||
1266 urb->number_of_packets >= UHCI_NUMFRAMES)
1267 return -EFBIG;
1268
Alan Sternc44b2252012-10-01 10:32:09 -04001269 uhci_get_current_frame_number(uhci);
1270
Alan Sterncaf38272006-05-19 16:44:55 -04001271 /* Check the period and figure out the starting frame number */
Alan Stern3ca2a322007-01-16 11:56:32 -05001272 if (!qh->bandwidth_reserved) {
1273 qh->period = urb->interval;
Alan Sternc44b2252012-10-01 10:32:09 -04001274 qh->phase = -1; /* Find the best phase */
1275 i = uhci_check_bandwidth(uhci, qh);
1276 if (i)
1277 return i;
Alan Stern3ca2a322007-01-16 11:56:32 -05001278
Alan Sternc44b2252012-10-01 10:32:09 -04001279 /* Allow a little time to allocate the TDs */
1280 next = uhci->frame_number + 10;
1281 frame = qh->phase;
Alan Stern3ca2a322007-01-16 11:56:32 -05001282
Alan Sternc44b2252012-10-01 10:32:09 -04001283 /* Round up to the first available slot */
1284 frame += (next - frame + qh->period - 1) & -qh->period;
Alan Stern3ca2a322007-01-16 11:56:32 -05001285
Alan Sterncaf38272006-05-19 16:44:55 -04001286 } else if (qh->period != urb->interval) {
1287 return -EINVAL; /* Can't change the period */
1288
Alan Stern7898ffc2007-10-16 11:55:30 -04001289 } else {
Alan Sterne19440172013-05-14 13:57:19 -04001290 next = uhci->frame_number + 1;
Alan Sternc44b2252012-10-01 10:32:09 -04001291
Alan Stern7898ffc2007-10-16 11:55:30 -04001292 /* Find the next unused frame */
Alan Sterncaf38272006-05-19 16:44:55 -04001293 if (list_empty(&qh->queue)) {
Alan Sternc8155cc2006-05-19 16:52:35 -04001294 frame = qh->iso_frame;
Alan Sterncaf38272006-05-19 16:44:55 -04001295 } else {
1296 struct urb *lurb;
1297
1298 lurb = list_entry(qh->queue.prev,
1299 struct urb_priv, node)->urb;
1300 frame = lurb->start_frame +
1301 lurb->number_of_packets *
1302 lurb->interval;
1303 }
Alan Sternc44b2252012-10-01 10:32:09 -04001304
1305 /* Fell behind? */
Alan Sternbef073b2013-09-24 15:47:20 -04001306 if (!uhci_frame_before_eq(next, frame)) {
Alan Sternc44b2252012-10-01 10:32:09 -04001307
1308 /* USB_ISO_ASAP: Round up to the first available slot */
1309 if (urb->transfer_flags & URB_ISO_ASAP)
1310 frame += (next - frame + qh->period - 1) &
1311 -qh->period;
1312
1313 /*
Alan Sternbef073b2013-09-24 15:47:20 -04001314 * Not ASAP: Use the next slot in the stream,
1315 * no matter what.
Alan Stern7898ffc2007-10-16 11:55:30 -04001316 */
Alan Sternc44b2252012-10-01 10:32:09 -04001317 else if (!uhci_frame_before_eq(next,
1318 frame + (urb->number_of_packets - 1) *
1319 qh->period))
Alan Sternbef073b2013-09-24 15:47:20 -04001320 dev_dbg(uhci_dev(uhci), "iso underrun %p (%u+%u < %u)\n",
1321 urb, frame,
1322 (urb->number_of_packets - 1) *
1323 qh->period,
1324 next);
Alan Sternc44b2252012-10-01 10:32:09 -04001325 }
Alan Sterncaf38272006-05-19 16:44:55 -04001326 }
1327
1328 /* Make sure we won't have to go too far into the future */
Alan Sternc8155cc2006-05-19 16:52:35 -04001329 if (uhci_frame_before_eq(uhci->last_iso_frame + UHCI_NUMFRAMES,
Alan Sternc44b2252012-10-01 10:32:09 -04001330 frame + urb->number_of_packets * urb->interval))
Alan Stern0ed8fee2005-12-17 18:02:38 -05001331 return -EFBIG;
Alan Sternc44b2252012-10-01 10:32:09 -04001332 urb->start_frame = frame;
Alan Stern0ed8fee2005-12-17 18:02:38 -05001333
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
1335 destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
1336
Alan Sternb81d3432005-10-13 17:00:24 -04001337 for (i = 0; i < urb->number_of_packets; i++) {
Alan Stern25321782005-04-25 11:14:31 -04001338 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 if (!td)
1340 return -ENOMEM;
1341
Alan Stern04538a22006-05-12 11:29:04 -04001342 uhci_add_td_to_urbp(td, urbp);
Jan Andersson51e2f622011-05-18 10:44:51 +02001343 uhci_fill_td(uhci, td, status, destination |
Alan Sterndccf4a42005-12-17 17:58:46 -05001344 uhci_explen(urb->iso_frame_desc[i].length),
1345 urb->transfer_dma +
1346 urb->iso_frame_desc[i].offset);
Alan Sternb81d3432005-10-13 17:00:24 -04001347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
Alan Sterndccf4a42005-12-17 17:58:46 -05001349 /* Set the interrupt-on-completion flag on the last packet. */
Jan Andersson51e2f622011-05-18 10:44:51 +02001350 td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC);
Alan Sterndccf4a42005-12-17 17:58:46 -05001351
Alan Sterndccf4a42005-12-17 17:58:46 -05001352 /* Add the TDs to the frame list */
Alan Sternb81d3432005-10-13 17:00:24 -04001353 frame = urb->start_frame;
1354 list_for_each_entry(td, &urbp->td_list, list) {
Alan Sterndccf4a42005-12-17 17:58:46 -05001355 uhci_insert_td_in_frame_list(uhci, td, frame);
Alan Sternc8155cc2006-05-19 16:52:35 -04001356 frame += qh->period;
1357 }
1358
1359 if (list_empty(&qh->queue)) {
1360 qh->iso_packet_desc = &urb->iso_frame_desc[0];
1361 qh->iso_frame = urb->start_frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 }
1363
Alan Stern17230ac2007-02-19 15:52:45 -05001364 qh->skel = SKEL_ISO;
Alan Stern3ca2a322007-01-16 11:56:32 -05001365 if (!qh->bandwidth_reserved)
1366 uhci_reserve_bandwidth(uhci, qh);
Alan Sterndccf4a42005-12-17 17:58:46 -05001367 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368}
1369
1370static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
1371{
Alan Sternc8155cc2006-05-19 16:52:35 -04001372 struct uhci_td *td, *tmp;
1373 struct urb_priv *urbp = urb->hcpriv;
1374 struct uhci_qh *qh = urbp->qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
Alan Sternc8155cc2006-05-19 16:52:35 -04001376 list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
1377 unsigned int ctrlstat;
1378 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 int actlength;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380
Alan Sternc8155cc2006-05-19 16:52:35 -04001381 if (uhci_frame_before_eq(uhci->cur_iso_frame, qh->iso_frame))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 return -EINPROGRESS;
1383
Alan Sternc8155cc2006-05-19 16:52:35 -04001384 uhci_remove_tds_from_frame(uhci, qh->iso_frame);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
Jan Andersson51e2f622011-05-18 10:44:51 +02001386 ctrlstat = td_status(uhci, td);
Alan Sternc8155cc2006-05-19 16:52:35 -04001387 if (ctrlstat & TD_CTRL_ACTIVE) {
1388 status = -EXDEV; /* TD was added too late? */
1389 } else {
1390 status = uhci_map_status(uhci_status_bits(ctrlstat),
1391 usb_pipeout(urb->pipe));
1392 actlength = uhci_actual_length(ctrlstat);
1393
1394 urb->actual_length += actlength;
1395 qh->iso_packet_desc->actual_length = actlength;
1396 qh->iso_packet_desc->status = status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 }
Alan Sternee7d1f32007-08-21 15:37:50 -04001398 if (status)
Alan Sternc8155cc2006-05-19 16:52:35 -04001399 urb->error_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400
Alan Sternc8155cc2006-05-19 16:52:35 -04001401 uhci_remove_td_from_urbp(td);
1402 uhci_free_td(uhci, td);
1403 qh->iso_frame += qh->period;
1404 ++qh->iso_packet_desc;
1405 }
Alan Sternee7d1f32007-08-21 15:37:50 -04001406 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407}
1408
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409static int uhci_urb_enqueue(struct usb_hcd *hcd,
Al Viro55016f12005-10-21 03:21:58 -04001410 struct urb *urb, gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411{
1412 int ret;
1413 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1414 unsigned long flags;
Alan Sterndccf4a42005-12-17 17:58:46 -05001415 struct urb_priv *urbp;
1416 struct uhci_qh *qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
1418 spin_lock_irqsave(&uhci->lock, flags);
1419
Alan Sterne9df41c2007-08-08 11:48:02 -04001420 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1421 if (ret)
1422 goto done_not_linked;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
Alan Sterndccf4a42005-12-17 17:58:46 -05001424 ret = -ENOMEM;
1425 urbp = uhci_alloc_urb_priv(uhci, urb);
1426 if (!urbp)
1427 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
Alan Sterne9df41c2007-08-08 11:48:02 -04001429 if (urb->ep->hcpriv)
1430 qh = urb->ep->hcpriv;
Alan Sterndccf4a42005-12-17 17:58:46 -05001431 else {
Alan Sterne9df41c2007-08-08 11:48:02 -04001432 qh = uhci_alloc_qh(uhci, urb->dev, urb->ep);
Alan Sterndccf4a42005-12-17 17:58:46 -05001433 if (!qh)
1434 goto err_no_qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 }
Alan Sterndccf4a42005-12-17 17:58:46 -05001436 urbp->qh = qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
Alan Stern4de7d2c2006-05-05 16:26:58 -04001438 switch (qh->type) {
1439 case USB_ENDPOINT_XFER_CONTROL:
Alan Sterndccf4a42005-12-17 17:58:46 -05001440 ret = uhci_submit_control(uhci, urb, qh);
1441 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001442 case USB_ENDPOINT_XFER_BULK:
Alan Sterndccf4a42005-12-17 17:58:46 -05001443 ret = uhci_submit_bulk(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001445 case USB_ENDPOINT_XFER_INT:
Alan Stern3ca2a322007-01-16 11:56:32 -05001446 ret = uhci_submit_interrupt(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001448 case USB_ENDPOINT_XFER_ISOC:
Alan Sternc8155cc2006-05-19 16:52:35 -04001449 urb->error_count = 0;
Alan Sterndccf4a42005-12-17 17:58:46 -05001450 ret = uhci_submit_isochronous(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 break;
1452 }
Alan Sterndccf4a42005-12-17 17:58:46 -05001453 if (ret != 0)
1454 goto err_submit_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Alan Sterndccf4a42005-12-17 17:58:46 -05001456 /* Add this URB to the QH */
Alan Sterndccf4a42005-12-17 17:58:46 -05001457 list_add_tail(&urbp->node, &qh->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
Alan Sterndccf4a42005-12-17 17:58:46 -05001459 /* If the new URB is the first and only one on this QH then either
1460 * the QH is new and idle or else it's unlinked and waiting to
Alan Stern27755622006-05-05 16:32:02 -04001461 * become idle, so we can activate it right away. But only if the
1462 * queue isn't stopped. */
Alan Stern84afddd2006-05-12 11:35:45 -04001463 if (qh->queue.next == &urbp->node && !qh->is_stopped) {
Alan Sterndccf4a42005-12-17 17:58:46 -05001464 uhci_activate_qh(uhci, qh);
Alan Sternc5e3b742006-06-05 12:28:57 -04001465 uhci_urbp_wants_fsbr(uhci, urbp);
Alan Stern84afddd2006-05-12 11:35:45 -04001466 }
Alan Sterndccf4a42005-12-17 17:58:46 -05001467 goto done;
1468
1469err_submit_failed:
1470 if (qh->state == QH_STATE_IDLE)
1471 uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */
Alan Sterndccf4a42005-12-17 17:58:46 -05001472err_no_qh:
1473 uhci_free_urb_priv(uhci, urbp);
Alan Sterndccf4a42005-12-17 17:58:46 -05001474done:
Alan Sterne9df41c2007-08-08 11:48:02 -04001475 if (ret)
1476 usb_hcd_unlink_urb_from_ep(hcd, urb);
1477done_not_linked:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 spin_unlock_irqrestore(&uhci->lock, flags);
1479 return ret;
1480}
1481
Alan Sterne9df41c2007-08-08 11:48:02 -04001482static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
1484 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1485 unsigned long flags;
Alan Stern10b8e472006-05-19 16:39:52 -04001486 struct uhci_qh *qh;
Alan Sterne9df41c2007-08-08 11:48:02 -04001487 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
1489 spin_lock_irqsave(&uhci->lock, flags);
Alan Sterne9df41c2007-08-08 11:48:02 -04001490 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1491 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 goto done;
Alan Sterne9df41c2007-08-08 11:48:02 -04001493
1494 qh = ((struct urb_priv *) urb->hcpriv)->qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
Alan Sterndccf4a42005-12-17 17:58:46 -05001496 /* Remove Isochronous TDs from the frame list ASAP */
Alan Stern10b8e472006-05-19 16:39:52 -04001497 if (qh->type == USB_ENDPOINT_XFER_ISOC) {
Alan Sterndccf4a42005-12-17 17:58:46 -05001498 uhci_unlink_isochronous_tds(uhci, urb);
Alan Stern10b8e472006-05-19 16:39:52 -04001499 mb();
1500
1501 /* If the URB has already started, update the QH unlink time */
1502 uhci_get_current_frame_number(uhci);
1503 if (uhci_frame_before_eq(urb->start_frame, uhci->frame_number))
1504 qh->unlink_frame = uhci->frame_number;
1505 }
1506
1507 uhci_unlink_qh(uhci, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
1509done:
1510 spin_unlock_irqrestore(&uhci->lock, flags);
Alan Sterne9df41c2007-08-08 11:48:02 -04001511 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512}
1513
Alan Stern0ed8fee2005-12-17 18:02:38 -05001514/*
1515 * Finish unlinking an URB and give it back
1516 */
1517static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh,
Alan Stern4a000272007-08-24 15:42:24 -04001518 struct urb *urb, int status)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001519__releases(uhci->lock)
1520__acquires(uhci->lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001522 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523
Alan Sterne7e7c362007-07-13 15:46:29 -04001524 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1525
Alan Stern7ea0a2b2009-03-05 11:01:11 -05001526 /* Subtract off the length of the SETUP packet from
1527 * urb->actual_length.
1528 */
1529 urb->actual_length -= min_t(u32, 8, urb->actual_length);
Alan Sterne7e7c362007-07-13 15:46:29 -04001530 }
1531
Alan Sternc8155cc2006-05-19 16:52:35 -04001532 /* When giving back the first URB in an Isochronous queue,
1533 * reinitialize the QH's iso-related members for the next URB. */
Alan Sterne7e7c362007-07-13 15:46:29 -04001534 else if (qh->type == USB_ENDPOINT_XFER_ISOC &&
Alan Sternc8155cc2006-05-19 16:52:35 -04001535 urbp->node.prev == &qh->queue &&
1536 urbp->node.next != &qh->queue) {
1537 struct urb *nurb = list_entry(urbp->node.next,
1538 struct urb_priv, node)->urb;
1539
1540 qh->iso_packet_desc = &nurb->iso_frame_desc[0];
1541 qh->iso_frame = nurb->start_frame;
Alan Sternc8155cc2006-05-19 16:52:35 -04001542 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Alan Stern0ed8fee2005-12-17 18:02:38 -05001544 /* Take the URB off the QH's queue. If the queue is now empty,
1545 * this is a perfect time for a toggle fixup. */
1546 list_del_init(&urbp->node);
1547 if (list_empty(&qh->queue) && qh->needs_fixup) {
1548 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1549 usb_pipeout(urb->pipe), qh->initial_toggle);
1550 qh->needs_fixup = 0;
1551 }
1552
Alan Stern0ed8fee2005-12-17 18:02:38 -05001553 uhci_free_urb_priv(uhci, urbp);
Alan Sterne9df41c2007-08-08 11:48:02 -04001554 usb_hcd_unlink_urb_from_ep(uhci_to_hcd(uhci), urb);
Alan Stern0ed8fee2005-12-17 18:02:38 -05001555
Alan Stern0ed8fee2005-12-17 18:02:38 -05001556 spin_unlock(&uhci->lock);
Alan Stern4a000272007-08-24 15:42:24 -04001557 usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, status);
Alan Stern0ed8fee2005-12-17 18:02:38 -05001558 spin_lock(&uhci->lock);
1559
1560 /* If the queue is now empty, we can unlink the QH and give up its
1561 * reserved bandwidth. */
1562 if (list_empty(&qh->queue)) {
1563 uhci_unlink_qh(uhci, qh);
Alan Stern3ca2a322007-01-16 11:56:32 -05001564 if (qh->bandwidth_reserved)
1565 uhci_release_bandwidth(uhci, qh);
Alan Stern0ed8fee2005-12-17 18:02:38 -05001566 }
1567}
1568
1569/*
1570 * Scan the URBs in a QH's queue
1571 */
1572#define QH_FINISHED_UNLINKING(qh) \
1573 (qh->state == QH_STATE_UNLINKING && \
1574 uhci->frame_number + uhci->is_stopped != qh->unlink_frame)
1575
David Howells7d12e782006-10-05 14:55:46 +01001576static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001577{
1578 struct urb_priv *urbp;
1579 struct urb *urb;
1580 int status;
1581
1582 while (!list_empty(&qh->queue)) {
1583 urbp = list_entry(qh->queue.next, struct urb_priv, node);
1584 urb = urbp->urb;
1585
Alan Sternb1869002006-05-12 11:14:25 -04001586 if (qh->type == USB_ENDPOINT_XFER_ISOC)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001587 status = uhci_result_isochronous(uhci, urb);
Alan Sternb1869002006-05-12 11:14:25 -04001588 else
Alan Stern0ed8fee2005-12-17 18:02:38 -05001589 status = uhci_result_common(uhci, urb);
Alan Stern0ed8fee2005-12-17 18:02:38 -05001590 if (status == -EINPROGRESS)
1591 break;
1592
Alan Stern0ed8fee2005-12-17 18:02:38 -05001593 /* Dequeued but completed URBs can't be given back unless
1594 * the QH is stopped or has finished unlinking. */
Alan Sterneb231052007-08-21 15:40:36 -04001595 if (urb->unlinked) {
Alan Stern27755622006-05-05 16:32:02 -04001596 if (QH_FINISHED_UNLINKING(qh))
1597 qh->is_stopped = 1;
1598 else if (!qh->is_stopped)
1599 return;
1600 }
Alan Stern0ed8fee2005-12-17 18:02:38 -05001601
Alan Stern4a000272007-08-24 15:42:24 -04001602 uhci_giveback_urb(uhci, qh, urb, status);
Alan Sternee7d1f32007-08-21 15:37:50 -04001603 if (status < 0)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001604 break;
1605 }
1606
1607 /* If the QH is neither stopped nor finished unlinking (normal case),
1608 * our work here is done. */
Alan Stern27755622006-05-05 16:32:02 -04001609 if (QH_FINISHED_UNLINKING(qh))
1610 qh->is_stopped = 1;
1611 else if (!qh->is_stopped)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001612 return;
1613
1614 /* Otherwise give back each of the dequeued URBs */
Alan Stern27755622006-05-05 16:32:02 -04001615restart:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001616 list_for_each_entry(urbp, &qh->queue, node) {
1617 urb = urbp->urb;
Alan Sterneb231052007-08-21 15:40:36 -04001618 if (urb->unlinked) {
Alan Stern10b8e472006-05-19 16:39:52 -04001619
1620 /* Fix up the TD links and save the toggles for
1621 * non-Isochronous queues. For Isochronous queues,
1622 * test for too-recent dequeues. */
1623 if (!uhci_cleanup_queue(uhci, qh, urb)) {
1624 qh->is_stopped = 0;
1625 return;
1626 }
Alan Stern4a000272007-08-24 15:42:24 -04001627 uhci_giveback_urb(uhci, qh, urb, 0);
Alan Stern0ed8fee2005-12-17 18:02:38 -05001628 goto restart;
1629 }
1630 }
1631 qh->is_stopped = 0;
1632
1633 /* There are no more dequeued URBs. If there are still URBs on the
1634 * queue, the QH can now be re-activated. */
1635 if (!list_empty(&qh->queue)) {
1636 if (qh->needs_fixup)
Jan Andersson51e2f622011-05-18 10:44:51 +02001637 uhci_fixup_toggles(uhci, qh, 0);
Alan Stern84afddd2006-05-12 11:35:45 -04001638
1639 /* If the first URB on the queue wants FSBR but its time
1640 * limit has expired, set the next TD to interrupt on
1641 * completion before reactivating the QH. */
1642 urbp = list_entry(qh->queue.next, struct urb_priv, node);
1643 if (urbp->fsbr && qh->wait_expired) {
1644 struct uhci_td *td = list_entry(urbp->td_list.next,
1645 struct uhci_td, list);
1646
Jan Andersson51e2f622011-05-18 10:44:51 +02001647 td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC);
Alan Stern84afddd2006-05-12 11:35:45 -04001648 }
1649
Alan Stern0ed8fee2005-12-17 18:02:38 -05001650 uhci_activate_qh(uhci, qh);
1651 }
1652
1653 /* The queue is empty. The QH can become idle if it is fully
1654 * unlinked. */
1655 else if (QH_FINISHED_UNLINKING(qh))
1656 uhci_make_qh_idle(uhci, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657}
1658
Alan Stern0ed8fee2005-12-17 18:02:38 -05001659/*
Alan Stern84afddd2006-05-12 11:35:45 -04001660 * Check for queues that have made some forward progress.
1661 * Returns 0 if the queue is not Isochronous, is ACTIVE, and
1662 * has not advanced since last examined; 1 otherwise.
Alan Sternb761d9d2006-05-12 11:41:59 -04001663 *
1664 * Early Intel controllers have a bug which causes qh->element sometimes
1665 * not to advance when a TD completes successfully. The queue remains
1666 * stuck on the inactive completed TD. We detect such cases and advance
1667 * the element pointer by hand.
Alan Stern84afddd2006-05-12 11:35:45 -04001668 */
1669static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh)
1670{
1671 struct urb_priv *urbp = NULL;
1672 struct uhci_td *td;
1673 int ret = 1;
1674 unsigned status;
1675
1676 if (qh->type == USB_ENDPOINT_XFER_ISOC)
Alan Sternc5e3b742006-06-05 12:28:57 -04001677 goto done;
Alan Stern84afddd2006-05-12 11:35:45 -04001678
1679 /* Treat an UNLINKING queue as though it hasn't advanced.
1680 * This is okay because reactivation will treat it as though
1681 * it has advanced, and if it is going to become IDLE then
1682 * this doesn't matter anyway. Furthermore it's possible
1683 * for an UNLINKING queue not to have any URBs at all, or
1684 * for its first URB not to have any TDs (if it was dequeued
1685 * just as it completed). So it's not easy in any case to
1686 * test whether such queues have advanced. */
1687 if (qh->state != QH_STATE_ACTIVE) {
1688 urbp = NULL;
1689 status = 0;
1690
1691 } else {
1692 urbp = list_entry(qh->queue.next, struct urb_priv, node);
1693 td = list_entry(urbp->td_list.next, struct uhci_td, list);
Jan Andersson51e2f622011-05-18 10:44:51 +02001694 status = td_status(uhci, td);
Alan Stern84afddd2006-05-12 11:35:45 -04001695 if (!(status & TD_CTRL_ACTIVE)) {
1696
1697 /* We're okay, the queue has advanced */
1698 qh->wait_expired = 0;
1699 qh->advance_jiffies = jiffies;
Alan Sternc5e3b742006-06-05 12:28:57 -04001700 goto done;
Alan Stern84afddd2006-05-12 11:35:45 -04001701 }
Alan Sternba297ed2010-06-09 17:34:39 -04001702 ret = uhci->is_stopped;
Alan Stern84afddd2006-05-12 11:35:45 -04001703 }
1704
1705 /* The queue hasn't advanced; check for timeout */
Alan Sternc5e3b742006-06-05 12:28:57 -04001706 if (qh->wait_expired)
1707 goto done;
1708
1709 if (time_after(jiffies, qh->advance_jiffies + QH_WAIT_TIMEOUT)) {
Alan Sternb761d9d2006-05-12 11:41:59 -04001710
1711 /* Detect the Intel bug and work around it */
Jan Andersson51e2f622011-05-18 10:44:51 +02001712 if (qh->post_td && qh_element(qh) ==
1713 LINK_TO_TD(uhci, qh->post_td)) {
Alan Sternb761d9d2006-05-12 11:41:59 -04001714 qh->element = qh->post_td->link;
1715 qh->advance_jiffies = jiffies;
Alan Sternc5e3b742006-06-05 12:28:57 -04001716 ret = 1;
1717 goto done;
Alan Sternb761d9d2006-05-12 11:41:59 -04001718 }
1719
Alan Stern84afddd2006-05-12 11:35:45 -04001720 qh->wait_expired = 1;
1721
1722 /* If the current URB wants FSBR, unlink it temporarily
1723 * so that we can safely set the next TD to interrupt on
1724 * completion. That way we'll know as soon as the queue
1725 * starts moving again. */
1726 if (urbp && urbp->fsbr && !(status & TD_CTRL_IOC))
1727 uhci_unlink_qh(uhci, qh);
Alan Sternc5e3b742006-06-05 12:28:57 -04001728
1729 } else {
1730 /* Unmoving but not-yet-expired queues keep FSBR alive */
1731 if (urbp)
1732 uhci_urbp_wants_fsbr(uhci, urbp);
Alan Stern84afddd2006-05-12 11:35:45 -04001733 }
Alan Sternc5e3b742006-06-05 12:28:57 -04001734
1735done:
Alan Stern84afddd2006-05-12 11:35:45 -04001736 return ret;
1737}
1738
1739/*
Alan Stern0ed8fee2005-12-17 18:02:38 -05001740 * Process events in the schedule, but only in one thread at a time
1741 */
David Howells7d12e782006-10-05 14:55:46 +01001742static void uhci_scan_schedule(struct uhci_hcd *uhci)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001744 int i;
1745 struct uhci_qh *qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746
1747 /* Don't allow re-entrant calls */
1748 if (uhci->scan_in_progress) {
1749 uhci->need_rescan = 1;
1750 return;
1751 }
1752 uhci->scan_in_progress = 1;
Alan Stern84afddd2006-05-12 11:35:45 -04001753rescan:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 uhci->need_rescan = 0;
Alan Sternc5e3b742006-06-05 12:28:57 -04001755 uhci->fsbr_is_wanted = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756
Alan Stern6c1b4452005-04-21 16:04:58 -04001757 uhci_clear_next_interrupt(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 uhci_get_current_frame_number(uhci);
Alan Sternc8155cc2006-05-19 16:52:35 -04001759 uhci->cur_iso_frame = uhci->frame_number;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760
Alan Stern0ed8fee2005-12-17 18:02:38 -05001761 /* Go through all the QH queues and process the URBs in each one */
1762 for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) {
1763 uhci->next_qh = list_entry(uhci->skelqh[i]->node.next,
1764 struct uhci_qh, node);
1765 while ((qh = uhci->next_qh) != uhci->skelqh[i]) {
1766 uhci->next_qh = list_entry(qh->node.next,
1767 struct uhci_qh, node);
Alan Stern84afddd2006-05-12 11:35:45 -04001768
1769 if (uhci_advance_check(uhci, qh)) {
David Howells7d12e782006-10-05 14:55:46 +01001770 uhci_scan_qh(uhci, qh);
Alan Sternc5e3b742006-06-05 12:28:57 -04001771 if (qh->state == QH_STATE_ACTIVE) {
1772 uhci_urbp_wants_fsbr(uhci,
1773 list_entry(qh->queue.next, struct urb_priv, node));
1774 }
Alan Stern84afddd2006-05-12 11:35:45 -04001775 }
Alan Stern0ed8fee2005-12-17 18:02:38 -05001776 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778
Alan Sternc8155cc2006-05-19 16:52:35 -04001779 uhci->last_iso_frame = uhci->cur_iso_frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 if (uhci->need_rescan)
1781 goto rescan;
1782 uhci->scan_in_progress = 0;
1783
Alan Sternc5e3b742006-06-05 12:28:57 -04001784 if (uhci->fsbr_is_on && !uhci->fsbr_is_wanted &&
1785 !uhci->fsbr_expiring) {
1786 uhci->fsbr_expiring = 1;
1787 mod_timer(&uhci->fsbr_timer, jiffies + FSBR_OFF_DELAY);
1788 }
Alan Stern84afddd2006-05-12 11:35:45 -04001789
Alan Stern04538a22006-05-12 11:29:04 -04001790 if (list_empty(&uhci->skel_unlink_qh->node))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 uhci_clear_next_interrupt(uhci);
1792 else
1793 uhci_set_next_interrupt(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794}