blob: 64b6c74789fd88e169c3df55992c199b2b47a898 [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 Sterndccf4a42005-12-17 17:58:46 -050016 * (C) Copyright 2004-2005 Alan Stern, stern@rowland.harvard.edu
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019static void uhci_free_pending_tds(struct uhci_hcd *uhci);
20
21/*
22 * Technically, updating td->status here is a race, but it's not really a
23 * problem. The worst that can happen is that we set the IOC bit again
24 * generating a spurious interrupt. We could fix this by creating another
25 * QH and leaving the IOC bit always set, but then we would have to play
26 * games with the FSBR code to make sure we get the correct order in all
27 * the cases. I don't think it's worth the effort
28 */
Alan Sterndccf4a42005-12-17 17:58:46 -050029static void uhci_set_next_interrupt(struct uhci_hcd *uhci)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
Alan Stern6c1b4452005-04-21 16:04:58 -040031 if (uhci->is_stopped)
Alan Stern1f09df82005-09-05 13:59:51 -040032 mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC);
34}
35
36static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
37{
38 uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
39}
40
Alan Stern25321782005-04-25 11:14:31 -040041static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 dma_addr_t dma_handle;
44 struct uhci_td *td;
45
46 td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
47 if (!td)
48 return NULL;
49
50 td->dma_handle = dma_handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 td->frame = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53 INIT_LIST_HEAD(&td->list);
54 INIT_LIST_HEAD(&td->remove_list);
55 INIT_LIST_HEAD(&td->fl_list);
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return td;
58}
59
Alan Sterndccf4a42005-12-17 17:58:46 -050060static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
61{
62 if (!list_empty(&td->list))
63 dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
64 if (!list_empty(&td->remove_list))
65 dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td);
66 if (!list_empty(&td->fl_list))
67 dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
68
69 dma_pool_free(uhci->td_pool, td, td->dma_handle);
70}
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072static inline void uhci_fill_td(struct uhci_td *td, u32 status,
73 u32 token, u32 buffer)
74{
75 td->status = cpu_to_le32(status);
76 td->token = cpu_to_le32(token);
77 td->buffer = cpu_to_le32(buffer);
78}
79
80/*
Alan Stern687f5f32005-11-30 17:16:19 -050081 * We insert Isochronous URBs directly into the frame list at the beginning
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 */
Alan Sterndccf4a42005-12-17 17:58:46 -050083static inline void uhci_insert_td_in_frame_list(struct uhci_hcd *uhci,
84 struct uhci_td *td, unsigned framenum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
86 framenum &= (UHCI_NUMFRAMES - 1);
87
88 td->frame = framenum;
89
90 /* Is there a TD already mapped there? */
Alan Sterna1d59ce2005-09-16 14:22:51 -040091 if (uhci->frame_cpu[framenum]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 struct uhci_td *ftd, *ltd;
93
Alan Sterna1d59ce2005-09-16 14:22:51 -040094 ftd = uhci->frame_cpu[framenum];
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
96
97 list_add_tail(&td->fl_list, &ftd->fl_list);
98
99 td->link = ltd->link;
100 wmb();
101 ltd->link = cpu_to_le32(td->dma_handle);
102 } else {
Alan Sterna1d59ce2005-09-16 14:22:51 -0400103 td->link = uhci->frame[framenum];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 wmb();
Alan Sterna1d59ce2005-09-16 14:22:51 -0400105 uhci->frame[framenum] = cpu_to_le32(td->dma_handle);
106 uhci->frame_cpu[framenum] = td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 }
108}
109
Alan Sterndccf4a42005-12-17 17:58:46 -0500110static inline void uhci_remove_td_from_frame_list(struct uhci_hcd *uhci,
Alan Sternb81d3432005-10-13 17:00:24 -0400111 struct uhci_td *td)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
113 /* If it's not inserted, don't remove it */
Alan Sternb81d3432005-10-13 17:00:24 -0400114 if (td->frame == -1) {
115 WARN_ON(!list_empty(&td->fl_list));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return;
Alan Sternb81d3432005-10-13 17:00:24 -0400117 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Alan Sternb81d3432005-10-13 17:00:24 -0400119 if (uhci->frame_cpu[td->frame] == td) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 if (list_empty(&td->fl_list)) {
Alan Sterna1d59ce2005-09-16 14:22:51 -0400121 uhci->frame[td->frame] = td->link;
122 uhci->frame_cpu[td->frame] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 } else {
124 struct uhci_td *ntd;
125
126 ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
Alan Sterna1d59ce2005-09-16 14:22:51 -0400127 uhci->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
128 uhci->frame_cpu[td->frame] = ntd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 }
130 } else {
131 struct uhci_td *ptd;
132
133 ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
134 ptd->link = td->link;
135 }
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 list_del_init(&td->fl_list);
138 td->frame = -1;
139}
140
Alan Sterndccf4a42005-12-17 17:58:46 -0500141/*
142 * Remove all the TDs for an Isochronous URB from the frame list
143 */
144static void uhci_unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb)
Alan Sternb81d3432005-10-13 17:00:24 -0400145{
146 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
147 struct uhci_td *td;
148
149 list_for_each_entry(td, &urbp->td_list, list)
Alan Sterndccf4a42005-12-17 17:58:46 -0500150 uhci_remove_td_from_frame_list(uhci, td);
Alan Sternb81d3432005-10-13 17:00:24 -0400151 wmb();
152}
153
Alan Sterndccf4a42005-12-17 17:58:46 -0500154static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
155 struct usb_device *udev, struct usb_host_endpoint *hep)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 dma_addr_t dma_handle;
158 struct uhci_qh *qh;
159
160 qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
161 if (!qh)
162 return NULL;
163
Alan Stern59e29ed2006-05-12 11:19:19 -0400164 memset(qh, 0, sizeof(*qh));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 qh->dma_handle = dma_handle;
166
167 qh->element = UHCI_PTR_TERM;
168 qh->link = UHCI_PTR_TERM;
169
Alan Sterndccf4a42005-12-17 17:58:46 -0500170 INIT_LIST_HEAD(&qh->queue);
171 INIT_LIST_HEAD(&qh->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Alan Sterndccf4a42005-12-17 17:58:46 -0500173 if (udev) { /* Normal QH */
Alan Sternaf0bb592005-12-17 18:00:12 -0500174 qh->dummy_td = uhci_alloc_td(uhci);
175 if (!qh->dummy_td) {
176 dma_pool_free(uhci->qh_pool, qh, dma_handle);
177 return NULL;
178 }
Alan Sterndccf4a42005-12-17 17:58:46 -0500179 qh->state = QH_STATE_IDLE;
180 qh->hep = hep;
181 qh->udev = udev;
182 hep->hcpriv = qh;
Alan Stern4de7d2c2006-05-05 16:26:58 -0400183 qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Alan Sterndccf4a42005-12-17 17:58:46 -0500185 } else { /* Skeleton QH */
186 qh->state = QH_STATE_ACTIVE;
Alan Stern4de7d2c2006-05-05 16:26:58 -0400187 qh->type = -1;
Alan Sterndccf4a42005-12-17 17:58:46 -0500188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return qh;
190}
191
192static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
193{
Alan Sterndccf4a42005-12-17 17:58:46 -0500194 WARN_ON(qh->state != QH_STATE_IDLE && qh->udev);
195 if (!list_empty(&qh->queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Alan Sterndccf4a42005-12-17 17:58:46 -0500198 list_del(&qh->node);
199 if (qh->udev) {
200 qh->hep->hcpriv = NULL;
Alan Sternaf0bb592005-12-17 18:00:12 -0500201 uhci_free_td(uhci, qh->dummy_td);
Alan Sterndccf4a42005-12-17 17:58:46 -0500202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
204}
205
206/*
Alan Sterna0b458b2006-05-12 11:23:19 -0400207 * When a queue is stopped and a dequeued URB is given back, adjust
208 * the previous TD link (if the URB isn't first on the queue) or
209 * save its toggle value (if it is first and is currently executing).
Alan Stern0ed8fee2005-12-17 18:02:38 -0500210 */
Alan Sterna0b458b2006-05-12 11:23:19 -0400211static void uhci_cleanup_queue(struct uhci_qh *qh,
212 struct urb *urb)
Alan Stern0ed8fee2005-12-17 18:02:38 -0500213{
Alan Sterna0b458b2006-05-12 11:23:19 -0400214 struct urb_priv *urbp = urb->hcpriv;
Alan Stern0ed8fee2005-12-17 18:02:38 -0500215 struct uhci_td *td;
216
Alan Sterna0b458b2006-05-12 11:23:19 -0400217 /* Isochronous pipes don't use toggles and their TD link pointers
218 * get adjusted during uhci_urb_dequeue(). */
219 if (qh->type == USB_ENDPOINT_XFER_ISOC)
220 return;
221
222 /* If the URB isn't first on its queue, adjust the link pointer
223 * of the last TD in the previous URB. The toggle doesn't need
224 * to be saved since this URB can't be executing yet. */
225 if (qh->queue.next != &urbp->node) {
226 struct urb_priv *purbp;
227 struct uhci_td *ptd;
228
229 purbp = list_entry(urbp->node.prev, struct urb_priv, node);
230 WARN_ON(list_empty(&purbp->td_list));
231 ptd = list_entry(purbp->td_list.prev, struct uhci_td,
232 list);
233 td = list_entry(urbp->td_list.prev, struct uhci_td,
234 list);
235 ptd->link = td->link;
236 return;
237 }
238
Alan Stern0ed8fee2005-12-17 18:02:38 -0500239 /* If the QH element pointer is UHCI_PTR_TERM then then currently
240 * executing URB has already been unlinked, so this one isn't it. */
Alan Sterna0b458b2006-05-12 11:23:19 -0400241 if (qh_element(qh) == UHCI_PTR_TERM)
Alan Stern0ed8fee2005-12-17 18:02:38 -0500242 return;
243 qh->element = UHCI_PTR_TERM;
244
Alan Sterna0b458b2006-05-12 11:23:19 -0400245 /* Control pipes have to worry about toggles */
246 if (qh->type == USB_ENDPOINT_XFER_CONTROL)
Alan Stern0ed8fee2005-12-17 18:02:38 -0500247 return;
248
Alan Sterna0b458b2006-05-12 11:23:19 -0400249 /* Save the next toggle value */
Alan Stern59e29ed2006-05-12 11:19:19 -0400250 WARN_ON(list_empty(&urbp->td_list));
251 td = list_entry(urbp->td_list.next, struct uhci_td, list);
252 qh->needs_fixup = 1;
253 qh->initial_toggle = uhci_toggle(td_token(td));
Alan Stern0ed8fee2005-12-17 18:02:38 -0500254}
255
256/*
257 * Fix up the data toggles for URBs in a queue, when one of them
258 * terminates early (short transfer, error, or dequeued).
259 */
260static void uhci_fixup_toggles(struct uhci_qh *qh, int skip_first)
261{
262 struct urb_priv *urbp = NULL;
263 struct uhci_td *td;
264 unsigned int toggle = qh->initial_toggle;
265 unsigned int pipe;
266
267 /* Fixups for a short transfer start with the second URB in the
268 * queue (the short URB is the first). */
269 if (skip_first)
270 urbp = list_entry(qh->queue.next, struct urb_priv, node);
271
272 /* When starting with the first URB, if the QH element pointer is
273 * still valid then we know the URB's toggles are okay. */
274 else if (qh_element(qh) != UHCI_PTR_TERM)
275 toggle = 2;
276
277 /* Fix up the toggle for the URBs in the queue. Normally this
278 * loop won't run more than once: When an error or short transfer
279 * occurs, the queue usually gets emptied. */
Alan Stern1393adb2006-01-31 10:02:55 -0500280 urbp = list_prepare_entry(urbp, &qh->queue, node);
Alan Stern0ed8fee2005-12-17 18:02:38 -0500281 list_for_each_entry_continue(urbp, &qh->queue, node) {
282
283 /* If the first TD has the right toggle value, we don't
284 * need to change any toggles in this URB */
285 td = list_entry(urbp->td_list.next, struct uhci_td, list);
286 if (toggle > 1 || uhci_toggle(td_token(td)) == toggle) {
287 td = list_entry(urbp->td_list.next, struct uhci_td,
288 list);
289 toggle = uhci_toggle(td_token(td)) ^ 1;
290
291 /* Otherwise all the toggles in the URB have to be switched */
292 } else {
293 list_for_each_entry(td, &urbp->td_list, list) {
294 td->token ^= __constant_cpu_to_le32(
295 TD_TOKEN_TOGGLE);
296 toggle ^= 1;
297 }
298 }
299 }
300
301 wmb();
302 pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe;
303 usb_settoggle(qh->udev, usb_pipeendpoint(pipe),
304 usb_pipeout(pipe), toggle);
305 qh->needs_fixup = 0;
306}
307
308/*
Alan Sterndccf4a42005-12-17 17:58:46 -0500309 * Put a QH on the schedule in both hardware and software
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500311static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
Alan Sterndccf4a42005-12-17 17:58:46 -0500313 struct uhci_qh *pqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Alan Sterndccf4a42005-12-17 17:58:46 -0500315 WARN_ON(list_empty(&qh->queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Alan Sterndccf4a42005-12-17 17:58:46 -0500317 /* Set the element pointer if it isn't set already.
318 * This isn't needed for Isochronous queues, but it doesn't hurt. */
319 if (qh_element(qh) == UHCI_PTR_TERM) {
320 struct urb_priv *urbp = list_entry(qh->queue.next,
321 struct urb_priv, node);
322 struct uhci_td *td = list_entry(urbp->td_list.next,
323 struct uhci_td, list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Alan Sterndccf4a42005-12-17 17:58:46 -0500325 qh->element = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327
Alan Sterndccf4a42005-12-17 17:58:46 -0500328 if (qh->state == QH_STATE_ACTIVE)
329 return;
330 qh->state = QH_STATE_ACTIVE;
331
332 /* Move the QH from its old list to the end of the appropriate
333 * skeleton's list */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500334 if (qh == uhci->next_qh)
335 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
336 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500337 list_move_tail(&qh->node, &qh->skel->node);
338
339 /* Link it into the schedule */
340 pqh = list_entry(qh->node.prev, struct uhci_qh, node);
341 qh->link = pqh->link;
342 wmb();
343 pqh->link = UHCI_PTR_QH | cpu_to_le32(qh->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
346/*
Alan Sterndccf4a42005-12-17 17:58:46 -0500347 * Take a QH off the hardware schedule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500349static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
351 struct uhci_qh *pqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Alan Sterndccf4a42005-12-17 17:58:46 -0500353 if (qh->state == QH_STATE_UNLINKING)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return;
Alan Sterndccf4a42005-12-17 17:58:46 -0500355 WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev);
356 qh->state = QH_STATE_UNLINKING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
Alan Sterndccf4a42005-12-17 17:58:46 -0500358 /* Unlink the QH from the schedule and record when we did it */
359 pqh = list_entry(qh->node.prev, struct uhci_qh, node);
360 pqh->link = qh->link;
361 mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 uhci_get_current_frame_number(uhci);
Alan Sterndccf4a42005-12-17 17:58:46 -0500364 qh->unlink_frame = uhci->frame_number;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Alan Sterndccf4a42005-12-17 17:58:46 -0500366 /* Force an interrupt so we know when the QH is fully unlinked */
367 if (list_empty(&uhci->skel_unlink_qh->node))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 uhci_set_next_interrupt(uhci);
369
Alan Sterndccf4a42005-12-17 17:58:46 -0500370 /* Move the QH from its old list to the end of the unlinking list */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500371 if (qh == uhci->next_qh)
372 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
373 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500374 list_move_tail(&qh->node, &uhci->skel_unlink_qh->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
376
Alan Sterndccf4a42005-12-17 17:58:46 -0500377/*
378 * When we and the controller are through with a QH, it becomes IDLE.
379 * This happens when a QH has been off the schedule (on the unlinking
380 * list) for more than one frame, or when an error occurs while adding
381 * the first URB onto a new QH.
382 */
383static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Alan Sterndccf4a42005-12-17 17:58:46 -0500385 WARN_ON(qh->state == QH_STATE_ACTIVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Alan Stern0ed8fee2005-12-17 18:02:38 -0500387 if (qh == uhci->next_qh)
388 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
389 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500390 list_move(&qh->node, &uhci->idle_qh_list);
391 qh->state = QH_STATE_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Alan Stern59e29ed2006-05-12 11:19:19 -0400393 /* Now that the QH is idle, its post_td isn't being used */
394 if (qh->post_td) {
395 uhci_free_td(uhci, qh->post_td);
396 qh->post_td = NULL;
397 }
398
Alan Sterndccf4a42005-12-17 17:58:46 -0500399 /* If anyone is waiting for a QH to become idle, wake them up */
400 if (uhci->num_waiting)
401 wake_up_all(&uhci->waitqh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402}
403
Alan Sterndccf4a42005-12-17 17:58:46 -0500404static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci,
405 struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
407 struct urb_priv *urbp;
408
409 urbp = kmem_cache_alloc(uhci_up_cachep, SLAB_ATOMIC);
410 if (!urbp)
411 return NULL;
412
413 memset((void *)urbp, 0, sizeof(*urbp));
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 urbp->urb = urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 urb->hcpriv = urbp;
Alan Sterndccf4a42005-12-17 17:58:46 -0500417
418 INIT_LIST_HEAD(&urbp->node);
419 INIT_LIST_HEAD(&urbp->td_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421 return urbp;
422}
423
424static void uhci_add_td_to_urb(struct urb *urb, struct uhci_td *td)
425{
426 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 list_add_tail(&td->list, &urbp->td_list);
429}
430
431static void uhci_remove_td_from_urb(struct uhci_td *td)
432{
433 if (list_empty(&td->list))
434 return;
435
436 list_del_init(&td->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437}
438
Alan Sterndccf4a42005-12-17 17:58:46 -0500439static void uhci_free_urb_priv(struct uhci_hcd *uhci,
440 struct urb_priv *urbp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
442 struct uhci_td *td, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Alan Sterndccf4a42005-12-17 17:58:46 -0500444 if (!list_empty(&urbp->node))
445 dev_warn(uhci_dev(uhci), "urb %p still on QH's list!\n",
446 urbp->urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
448 uhci_get_current_frame_number(uhci);
449 if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) {
450 uhci_free_pending_tds(uhci);
451 uhci->td_remove_age = uhci->frame_number;
452 }
453
454 /* Check to see if the remove list is empty. Set the IOC bit */
Alan Sterndccf4a42005-12-17 17:58:46 -0500455 /* to force an interrupt so we can remove the TDs. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (list_empty(&uhci->td_remove_list))
457 uhci_set_next_interrupt(uhci);
458
459 list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
460 uhci_remove_td_from_urb(td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 list_add(&td->remove_list, &uhci->td_remove_list);
462 }
463
Alan Sterndccf4a42005-12-17 17:58:46 -0500464 urbp->urb->hcpriv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 kmem_cache_free(uhci_up_cachep, urbp);
466}
467
468static void uhci_inc_fsbr(struct uhci_hcd *uhci, struct urb *urb)
469{
470 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
471
472 if ((!(urb->transfer_flags & URB_NO_FSBR)) && !urbp->fsbr) {
473 urbp->fsbr = 1;
474 if (!uhci->fsbr++ && !uhci->fsbrtimeout)
475 uhci->skel_term_qh->link = cpu_to_le32(uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
476 }
477}
478
479static void uhci_dec_fsbr(struct uhci_hcd *uhci, struct urb *urb)
480{
481 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
482
483 if ((!(urb->transfer_flags & URB_NO_FSBR)) && urbp->fsbr) {
484 urbp->fsbr = 0;
485 if (!--uhci->fsbr)
486 uhci->fsbrtimeout = jiffies + FSBR_DELAY;
487 }
488}
489
490/*
491 * Map status to standard result codes
492 *
493 * <status> is (td_status(td) & 0xF60000), a.k.a.
494 * uhci_status_bits(td_status(td)).
495 * Note: <status> does not include the TD_CTRL_NAK bit.
496 * <dir_out> is True for output TDs and False for input TDs.
497 */
498static int uhci_map_status(int status, int dir_out)
499{
500 if (!status)
501 return 0;
502 if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */
503 return -EPROTO;
504 if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */
505 if (dir_out)
506 return -EPROTO;
507 else
508 return -EILSEQ;
509 }
510 if (status & TD_CTRL_BABBLE) /* Babble */
511 return -EOVERFLOW;
512 if (status & TD_CTRL_DBUFERR) /* Buffer error */
513 return -ENOSR;
514 if (status & TD_CTRL_STALLED) /* Stalled */
515 return -EPIPE;
516 WARN_ON(status & TD_CTRL_ACTIVE); /* Active */
517 return 0;
518}
519
520/*
521 * Control transfers
522 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500523static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
524 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 struct uhci_td *td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 unsigned long destination, status;
Alan Sterndccf4a42005-12-17 17:58:46 -0500528 int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 int len = urb->transfer_buffer_length;
530 dma_addr_t data = urb->transfer_dma;
Alan Sterndccf4a42005-12-17 17:58:46 -0500531 __le32 *plink;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 /* The "pipe" thing contains the destination in bits 8--18 */
534 destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
535
Alan Sternaf0bb592005-12-17 18:00:12 -0500536 /* 3 errors, dummy TD remains inactive */
537 status = uhci_maxerr(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 if (urb->dev->speed == USB_SPEED_LOW)
539 status |= TD_CTRL_LS;
540
541 /*
542 * Build the TD for the control request setup packet
543 */
Alan Sternaf0bb592005-12-17 18:00:12 -0500544 td = qh->dummy_td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 uhci_add_td_to_urb(urb, td);
Alan Sternfa346562005-11-30 11:57:51 -0500546 uhci_fill_td(td, status, destination | uhci_explen(8),
Alan Sterndccf4a42005-12-17 17:58:46 -0500547 urb->setup_dma);
548 plink = &td->link;
Alan Sternaf0bb592005-12-17 18:00:12 -0500549 status |= TD_CTRL_ACTIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 /*
552 * If direction is "send", change the packet ID from SETUP (0x2D)
553 * to OUT (0xE1). Else change it from SETUP to IN (0x69) and
554 * set Short Packet Detect (SPD) for all data packets.
555 */
556 if (usb_pipeout(urb->pipe))
557 destination ^= (USB_PID_SETUP ^ USB_PID_OUT);
558 else {
559 destination ^= (USB_PID_SETUP ^ USB_PID_IN);
560 status |= TD_CTRL_SPD;
561 }
562
563 /*
Alan Stern687f5f32005-11-30 17:16:19 -0500564 * Build the DATA TDs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 */
566 while (len > 0) {
Alan Sterndccf4a42005-12-17 17:58:46 -0500567 int pktsze = min(len, maxsze);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Alan Stern25321782005-04-25 11:14:31 -0400569 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500571 goto nomem;
Alan Sterndccf4a42005-12-17 17:58:46 -0500572 *plink = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574 /* Alternate Data0/1 (start with Data1) */
575 destination ^= TD_TOKEN_TOGGLE;
576
577 uhci_add_td_to_urb(urb, td);
Alan Sternfa346562005-11-30 11:57:51 -0500578 uhci_fill_td(td, status, destination | uhci_explen(pktsze),
Alan Sterndccf4a42005-12-17 17:58:46 -0500579 data);
580 plink = &td->link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
582 data += pktsze;
583 len -= pktsze;
584 }
585
586 /*
587 * Build the final TD for control status
588 */
Alan Stern25321782005-04-25 11:14:31 -0400589 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500591 goto nomem;
Alan Sterndccf4a42005-12-17 17:58:46 -0500592 *plink = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
594 /*
595 * It's IN if the pipe is an output pipe or we're not expecting
596 * data back.
597 */
598 destination &= ~TD_TOKEN_PID_MASK;
599 if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length)
600 destination |= USB_PID_IN;
601 else
602 destination |= USB_PID_OUT;
603
604 destination |= TD_TOKEN_TOGGLE; /* End in Data1 */
605
606 status &= ~TD_CTRL_SPD;
607
608 uhci_add_td_to_urb(urb, td);
609 uhci_fill_td(td, status | TD_CTRL_IOC,
Alan Sterndccf4a42005-12-17 17:58:46 -0500610 destination | uhci_explen(0), 0);
Alan Sternaf0bb592005-12-17 18:00:12 -0500611 plink = &td->link;
612
613 /*
614 * Build the new dummy TD and activate the old one
615 */
616 td = uhci_alloc_td(uhci);
617 if (!td)
618 goto nomem;
619 *plink = cpu_to_le32(td->dma_handle);
620
621 uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
622 wmb();
623 qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
624 qh->dummy_td = td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626 /* Low-speed transfers get a different queue, and won't hog the bus.
627 * Also, some devices enumerate better without FSBR; the easiest way
628 * to do that is to put URBs on the low-speed queue while the device
Alan Stern630aa3c2006-01-23 17:17:21 -0500629 * isn't in the CONFIGURED state. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if (urb->dev->speed == USB_SPEED_LOW ||
Alan Stern630aa3c2006-01-23 17:17:21 -0500631 urb->dev->state != USB_STATE_CONFIGURED)
Alan Sterndccf4a42005-12-17 17:58:46 -0500632 qh->skel = uhci->skel_ls_control_qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 else {
Alan Sterndccf4a42005-12-17 17:58:46 -0500634 qh->skel = uhci->skel_fs_control_qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 uhci_inc_fsbr(uhci, urb);
636 }
Alan Stern59e29ed2006-05-12 11:19:19 -0400637
638 urb->actual_length = -8; /* Account for the SETUP packet */
Alan Sterndccf4a42005-12-17 17:58:46 -0500639 return 0;
Alan Sternaf0bb592005-12-17 18:00:12 -0500640
641nomem:
642 /* Remove the dummy TD from the td_list so it doesn't get freed */
643 uhci_remove_td_from_urb(qh->dummy_td);
644 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645}
646
647/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 * Common submit for bulk and interrupt
649 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500650static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
651 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
653 struct uhci_td *td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 unsigned long destination, status;
Alan Sterndccf4a42005-12-17 17:58:46 -0500655 int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 int len = urb->transfer_buffer_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 dma_addr_t data = urb->transfer_dma;
Alan Sternaf0bb592005-12-17 18:00:12 -0500658 __le32 *plink;
659 unsigned int toggle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 if (len < 0)
662 return -EINVAL;
663
664 /* The "pipe" thing contains the destination in bits 8--18 */
665 destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
Alan Sternaf0bb592005-12-17 18:00:12 -0500666 toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
667 usb_pipeout(urb->pipe));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Alan Sternaf0bb592005-12-17 18:00:12 -0500669 /* 3 errors, dummy TD remains inactive */
670 status = uhci_maxerr(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 if (urb->dev->speed == USB_SPEED_LOW)
672 status |= TD_CTRL_LS;
673 if (usb_pipein(urb->pipe))
674 status |= TD_CTRL_SPD;
675
676 /*
Alan Stern687f5f32005-11-30 17:16:19 -0500677 * Build the DATA TDs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 */
Alan Sternaf0bb592005-12-17 18:00:12 -0500679 plink = NULL;
680 td = qh->dummy_td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 do { /* Allow zero length packets */
682 int pktsze = maxsze;
683
Alan Sterndccf4a42005-12-17 17:58:46 -0500684 if (len <= pktsze) { /* The last packet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 pktsze = len;
686 if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
687 status &= ~TD_CTRL_SPD;
688 }
689
Alan Sternaf0bb592005-12-17 18:00:12 -0500690 if (plink) {
691 td = uhci_alloc_td(uhci);
692 if (!td)
693 goto nomem;
694 *plink = cpu_to_le32(td->dma_handle);
695 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 uhci_add_td_to_urb(urb, td);
Alan Sterndccf4a42005-12-17 17:58:46 -0500697 uhci_fill_td(td, status,
Alan Sternaf0bb592005-12-17 18:00:12 -0500698 destination | uhci_explen(pktsze) |
699 (toggle << TD_TOKEN_TOGGLE_SHIFT),
700 data);
Alan Sterndccf4a42005-12-17 17:58:46 -0500701 plink = &td->link;
Alan Sternaf0bb592005-12-17 18:00:12 -0500702 status |= TD_CTRL_ACTIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
704 data += pktsze;
705 len -= maxsze;
Alan Sternaf0bb592005-12-17 18:00:12 -0500706 toggle ^= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 } while (len > 0);
708
709 /*
710 * URB_ZERO_PACKET means adding a 0-length packet, if direction
711 * is OUT and the transfer_length was an exact multiple of maxsze,
712 * hence (len = transfer_length - N * maxsze) == 0
713 * however, if transfer_length == 0, the zero packet was already
714 * prepared above.
715 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500716 if ((urb->transfer_flags & URB_ZERO_PACKET) &&
717 usb_pipeout(urb->pipe) && len == 0 &&
718 urb->transfer_buffer_length > 0) {
Alan Stern25321782005-04-25 11:14:31 -0400719 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500721 goto nomem;
Alan Sterndccf4a42005-12-17 17:58:46 -0500722 *plink = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 uhci_add_td_to_urb(urb, td);
Alan Sternaf0bb592005-12-17 18:00:12 -0500725 uhci_fill_td(td, status,
726 destination | uhci_explen(0) |
727 (toggle << TD_TOKEN_TOGGLE_SHIFT),
728 data);
729 plink = &td->link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
Alan Sternaf0bb592005-12-17 18:00:12 -0500731 toggle ^= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 }
733
734 /* Set the interrupt-on-completion flag on the last packet.
735 * A more-or-less typical 4 KB URB (= size of one memory page)
736 * will require about 3 ms to transfer; that's a little on the
737 * fast side but not enough to justify delaying an interrupt
738 * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
739 * flag setting. */
Alan Sterndccf4a42005-12-17 17:58:46 -0500740 td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Alan Sternaf0bb592005-12-17 18:00:12 -0500742 /*
743 * Build the new dummy TD and activate the old one
744 */
745 td = uhci_alloc_td(uhci);
746 if (!td)
747 goto nomem;
748 *plink = cpu_to_le32(td->dma_handle);
749
750 uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
751 wmb();
752 qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
753 qh->dummy_td = td;
754
755 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
756 usb_pipeout(urb->pipe), toggle);
Alan Sterndccf4a42005-12-17 17:58:46 -0500757 return 0;
Alan Sternaf0bb592005-12-17 18:00:12 -0500758
759nomem:
760 /* Remove the dummy TD from the td_list so it doesn't get freed */
761 uhci_remove_td_from_urb(qh->dummy_td);
762 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
Alan Sterndccf4a42005-12-17 17:58:46 -0500765static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb,
766 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
768 int ret;
769
770 /* Can't have low-speed bulk transfers */
771 if (urb->dev->speed == USB_SPEED_LOW)
772 return -EINVAL;
773
Alan Sterndccf4a42005-12-17 17:58:46 -0500774 qh->skel = uhci->skel_bulk_qh;
775 ret = uhci_submit_common(uhci, urb, qh);
776 if (ret == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 uhci_inc_fsbr(uhci, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 return ret;
779}
780
Alan Sterndccf4a42005-12-17 17:58:46 -0500781static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb,
782 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
Alan Sterndccf4a42005-12-17 17:58:46 -0500784 /* USB 1.1 interrupt transfers only involve one packet per interval.
785 * Drivers can submit URBs of any length, but longer ones will need
786 * multiple intervals to complete.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500788 qh->skel = uhci->skelqh[__interval_to_skel(urb->interval)];
789 return uhci_submit_common(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790}
791
792/*
Alan Sternb1869002006-05-12 11:14:25 -0400793 * Fix up the data structures following a short transfer
794 */
795static int uhci_fixup_short_transfer(struct uhci_hcd *uhci,
Alan Stern59e29ed2006-05-12 11:19:19 -0400796 struct uhci_qh *qh, struct urb_priv *urbp)
Alan Sternb1869002006-05-12 11:14:25 -0400797{
798 struct uhci_td *td;
Alan Stern59e29ed2006-05-12 11:19:19 -0400799 struct list_head *tmp;
800 int ret;
Alan Sternb1869002006-05-12 11:14:25 -0400801
802 td = list_entry(urbp->td_list.prev, struct uhci_td, list);
803 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
Alan Sternb1869002006-05-12 11:14:25 -0400804
805 /* When a control transfer is short, we have to restart
806 * the queue at the status stage transaction, which is
807 * the last TD. */
Alan Stern59e29ed2006-05-12 11:19:19 -0400808 WARN_ON(list_empty(&urbp->td_list));
Alan Sternb1869002006-05-12 11:14:25 -0400809 qh->element = cpu_to_le32(td->dma_handle);
Alan Stern59e29ed2006-05-12 11:19:19 -0400810 tmp = td->list.prev;
Alan Sternb1869002006-05-12 11:14:25 -0400811 ret = -EINPROGRESS;
812
Alan Stern59e29ed2006-05-12 11:19:19 -0400813 } else {
Alan Sternb1869002006-05-12 11:14:25 -0400814
815 /* When a bulk/interrupt transfer is short, we have to
816 * fix up the toggles of the following URBs on the queue
817 * before restarting the queue at the next URB. */
Alan Stern59e29ed2006-05-12 11:19:19 -0400818 qh->initial_toggle = uhci_toggle(td_token(qh->post_td)) ^ 1;
Alan Sternb1869002006-05-12 11:14:25 -0400819 uhci_fixup_toggles(qh, 1);
820
Alan Stern59e29ed2006-05-12 11:19:19 -0400821 if (list_empty(&urbp->td_list))
822 td = qh->post_td;
Alan Sternb1869002006-05-12 11:14:25 -0400823 qh->element = td->link;
Alan Stern59e29ed2006-05-12 11:19:19 -0400824 tmp = urbp->td_list.prev;
825 ret = 0;
Alan Sternb1869002006-05-12 11:14:25 -0400826 }
827
Alan Stern59e29ed2006-05-12 11:19:19 -0400828 /* Remove all the TDs we skipped over, from tmp back to the start */
829 while (tmp != &urbp->td_list) {
830 td = list_entry(tmp, struct uhci_td, list);
831 tmp = tmp->prev;
832
833 uhci_remove_td_from_urb(td);
834 list_add(&td->remove_list, &uhci->td_remove_list);
835 }
Alan Sternb1869002006-05-12 11:14:25 -0400836 return ret;
837}
838
839/*
840 * Common result for control, bulk, and interrupt
841 */
842static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
843{
844 struct urb_priv *urbp = urb->hcpriv;
845 struct uhci_qh *qh = urbp->qh;
Alan Stern59e29ed2006-05-12 11:19:19 -0400846 struct uhci_td *td, *tmp;
Alan Sternb1869002006-05-12 11:14:25 -0400847 unsigned status;
848 int ret = 0;
849
Alan Stern59e29ed2006-05-12 11:19:19 -0400850 list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
Alan Sternb1869002006-05-12 11:14:25 -0400851 unsigned int ctrlstat;
852 int len;
853
Alan Sternb1869002006-05-12 11:14:25 -0400854 ctrlstat = td_status(td);
855 status = uhci_status_bits(ctrlstat);
856 if (status & TD_CTRL_ACTIVE)
857 return -EINPROGRESS;
858
859 len = uhci_actual_length(ctrlstat);
860 urb->actual_length += len;
861
862 if (status) {
863 ret = uhci_map_status(status,
864 uhci_packetout(td_token(td)));
865 if ((debug == 1 && ret != -EPIPE) || debug > 1) {
866 /* Some debugging code */
867 dev_dbg(uhci_dev(uhci),
868 "%s: failed with status %x\n",
869 __FUNCTION__, status);
870
871 if (debug > 1 && errbuf) {
872 /* Print the chain for debugging */
873 uhci_show_qh(urbp->qh, errbuf,
874 ERRBUF_LEN, 0);
875 lprintk(errbuf);
876 }
877 }
878
879 } else if (len < uhci_expected_length(td_token(td))) {
880
881 /* We received a short packet */
882 if (urb->transfer_flags & URB_SHORT_NOT_OK)
883 ret = -EREMOTEIO;
884 else if (ctrlstat & TD_CTRL_SPD)
885 ret = 1;
886 }
887
Alan Stern59e29ed2006-05-12 11:19:19 -0400888 uhci_remove_td_from_urb(td);
889 if (qh->post_td)
890 list_add(&qh->post_td->remove_list,
891 &uhci->td_remove_list);
892 qh->post_td = td;
893
Alan Sternb1869002006-05-12 11:14:25 -0400894 if (ret != 0)
895 goto err;
896 }
897 return ret;
898
899err:
900 if (ret < 0) {
901 /* In case a control transfer gets an error
902 * during the setup stage */
903 urb->actual_length = max(urb->actual_length, 0);
904
905 /* Note that the queue has stopped and save
906 * the next toggle value */
907 qh->element = UHCI_PTR_TERM;
908 qh->is_stopped = 1;
909 qh->needs_fixup = (qh->type != USB_ENDPOINT_XFER_CONTROL);
910 qh->initial_toggle = uhci_toggle(td_token(td)) ^
911 (ret == -EREMOTEIO);
912
913 } else /* Short packet received */
Alan Stern59e29ed2006-05-12 11:19:19 -0400914 ret = uhci_fixup_short_transfer(uhci, qh, urbp);
Alan Sternb1869002006-05-12 11:14:25 -0400915 return ret;
916}
917
918/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 * Isochronous transfers
920 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500921static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb,
922 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923{
Alan Sterndccf4a42005-12-17 17:58:46 -0500924 struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500925 int i, frame;
Alan Sterndccf4a42005-12-17 17:58:46 -0500926 unsigned long destination, status;
Alan Sternb81d3432005-10-13 17:00:24 -0400927 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Alan Stern0ed8fee2005-12-17 18:02:38 -0500929 if (urb->number_of_packets > 900) /* 900? Why? */
930 return -EFBIG;
931
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
933 destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
934
Alan Stern0ed8fee2005-12-17 18:02:38 -0500935 /* Figure out the starting frame number */
936 if (urb->transfer_flags & URB_ISO_ASAP) {
937 if (list_empty(&qh->queue)) {
938 uhci_get_current_frame_number(uhci);
939 urb->start_frame = (uhci->frame_number + 10);
940
941 } else { /* Go right after the last one */
942 struct urb *last_urb;
943
944 last_urb = list_entry(qh->queue.prev,
945 struct urb_priv, node)->urb;
946 urb->start_frame = (last_urb->start_frame +
947 last_urb->number_of_packets *
948 last_urb->interval);
949 }
950 } else {
951 /* FIXME: Sanity check */
952 }
953 urb->start_frame &= (UHCI_NUMFRAMES - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Alan Sternb81d3432005-10-13 17:00:24 -0400955 for (i = 0; i < urb->number_of_packets; i++) {
Alan Stern25321782005-04-25 11:14:31 -0400956 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 if (!td)
958 return -ENOMEM;
959
960 uhci_add_td_to_urb(urb, td);
Alan Sterndccf4a42005-12-17 17:58:46 -0500961 uhci_fill_td(td, status, destination |
962 uhci_explen(urb->iso_frame_desc[i].length),
963 urb->transfer_dma +
964 urb->iso_frame_desc[i].offset);
Alan Sternb81d3432005-10-13 17:00:24 -0400965 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
Alan Sterndccf4a42005-12-17 17:58:46 -0500967 /* Set the interrupt-on-completion flag on the last packet. */
968 td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
969
970 qh->skel = uhci->skel_iso_qh;
971
972 /* Add the TDs to the frame list */
Alan Sternb81d3432005-10-13 17:00:24 -0400973 frame = urb->start_frame;
974 list_for_each_entry(td, &urbp->td_list, list) {
Alan Sterndccf4a42005-12-17 17:58:46 -0500975 uhci_insert_td_in_frame_list(uhci, td, frame);
Alan Sternb81d3432005-10-13 17:00:24 -0400976 frame += urb->interval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 }
978
Alan Sterndccf4a42005-12-17 17:58:46 -0500979 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980}
981
982static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
983{
984 struct uhci_td *td;
985 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
986 int status;
987 int i, ret = 0;
988
Alan Sternb81d3432005-10-13 17:00:24 -0400989 urb->actual_length = urb->error_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
991 i = 0;
992 list_for_each_entry(td, &urbp->td_list, list) {
993 int actlength;
994 unsigned int ctrlstat = td_status(td);
995
996 if (ctrlstat & TD_CTRL_ACTIVE)
997 return -EINPROGRESS;
998
999 actlength = uhci_actual_length(ctrlstat);
1000 urb->iso_frame_desc[i].actual_length = actlength;
1001 urb->actual_length += actlength;
1002
1003 status = uhci_map_status(uhci_status_bits(ctrlstat),
1004 usb_pipeout(urb->pipe));
1005 urb->iso_frame_desc[i].status = status;
1006 if (status) {
1007 urb->error_count++;
1008 ret = status;
1009 }
1010
1011 i++;
1012 }
1013
1014 return ret;
1015}
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017static int uhci_urb_enqueue(struct usb_hcd *hcd,
Alan Sterndccf4a42005-12-17 17:58:46 -05001018 struct usb_host_endpoint *hep,
Al Viro55016f12005-10-21 03:21:58 -04001019 struct urb *urb, gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020{
1021 int ret;
1022 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1023 unsigned long flags;
Alan Sterndccf4a42005-12-17 17:58:46 -05001024 struct urb_priv *urbp;
1025 struct uhci_qh *qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 int bustime;
1027
1028 spin_lock_irqsave(&uhci->lock, flags);
1029
1030 ret = urb->status;
1031 if (ret != -EINPROGRESS) /* URB already unlinked! */
Alan Sterndccf4a42005-12-17 17:58:46 -05001032 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
Alan Sterndccf4a42005-12-17 17:58:46 -05001034 ret = -ENOMEM;
1035 urbp = uhci_alloc_urb_priv(uhci, urb);
1036 if (!urbp)
1037 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
Alan Sterndccf4a42005-12-17 17:58:46 -05001039 if (hep->hcpriv)
1040 qh = (struct uhci_qh *) hep->hcpriv;
1041 else {
1042 qh = uhci_alloc_qh(uhci, urb->dev, hep);
1043 if (!qh)
1044 goto err_no_qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 }
Alan Sterndccf4a42005-12-17 17:58:46 -05001046 urbp->qh = qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Alan Stern4de7d2c2006-05-05 16:26:58 -04001048 switch (qh->type) {
1049 case USB_ENDPOINT_XFER_CONTROL:
Alan Sterndccf4a42005-12-17 17:58:46 -05001050 ret = uhci_submit_control(uhci, urb, qh);
1051 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001052 case USB_ENDPOINT_XFER_BULK:
Alan Sterndccf4a42005-12-17 17:58:46 -05001053 ret = uhci_submit_bulk(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001055 case USB_ENDPOINT_XFER_INT:
Alan Sterndccf4a42005-12-17 17:58:46 -05001056 if (list_empty(&qh->queue)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 bustime = usb_check_bandwidth(urb->dev, urb);
1058 if (bustime < 0)
1059 ret = bustime;
1060 else {
Alan Sterndccf4a42005-12-17 17:58:46 -05001061 ret = uhci_submit_interrupt(uhci, urb, qh);
1062 if (ret == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 usb_claim_bandwidth(urb->dev, urb, bustime, 0);
1064 }
1065 } else { /* inherit from parent */
Alan Sterndccf4a42005-12-17 17:58:46 -05001066 struct urb_priv *eurbp;
1067
1068 eurbp = list_entry(qh->queue.prev, struct urb_priv,
1069 node);
1070 urb->bandwidth = eurbp->urb->bandwidth;
1071 ret = uhci_submit_interrupt(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 }
1073 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001074 case USB_ENDPOINT_XFER_ISOC:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 bustime = usb_check_bandwidth(urb->dev, urb);
1076 if (bustime < 0) {
1077 ret = bustime;
1078 break;
1079 }
1080
Alan Sterndccf4a42005-12-17 17:58:46 -05001081 ret = uhci_submit_isochronous(uhci, urb, qh);
1082 if (ret == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 usb_claim_bandwidth(urb->dev, urb, bustime, 1);
1084 break;
1085 }
Alan Sterndccf4a42005-12-17 17:58:46 -05001086 if (ret != 0)
1087 goto err_submit_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Alan Sterndccf4a42005-12-17 17:58:46 -05001089 /* Add this URB to the QH */
1090 urbp->qh = qh;
1091 list_add_tail(&urbp->node, &qh->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
Alan Sterndccf4a42005-12-17 17:58:46 -05001093 /* If the new URB is the first and only one on this QH then either
1094 * the QH is new and idle or else it's unlinked and waiting to
Alan Stern27755622006-05-05 16:32:02 -04001095 * become idle, so we can activate it right away. But only if the
1096 * queue isn't stopped. */
1097 if (qh->queue.next == &urbp->node && !qh->is_stopped)
Alan Sterndccf4a42005-12-17 17:58:46 -05001098 uhci_activate_qh(uhci, qh);
Alan Sterndccf4a42005-12-17 17:58:46 -05001099 goto done;
1100
1101err_submit_failed:
1102 if (qh->state == QH_STATE_IDLE)
1103 uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */
1104
1105err_no_qh:
1106 uhci_free_urb_priv(uhci, urbp);
1107
1108done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 spin_unlock_irqrestore(&uhci->lock, flags);
1110 return ret;
1111}
1112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
1114{
1115 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1116 unsigned long flags;
1117 struct urb_priv *urbp;
1118
1119 spin_lock_irqsave(&uhci->lock, flags);
1120 urbp = urb->hcpriv;
1121 if (!urbp) /* URB was never linked! */
1122 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
Alan Sterndccf4a42005-12-17 17:58:46 -05001124 /* Remove Isochronous TDs from the frame list ASAP */
Alan Stern4de7d2c2006-05-05 16:26:58 -04001125 if (urbp->qh->type == USB_ENDPOINT_XFER_ISOC)
Alan Sterndccf4a42005-12-17 17:58:46 -05001126 uhci_unlink_isochronous_tds(uhci, urb);
1127 uhci_unlink_qh(uhci, urbp->qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
1129done:
1130 spin_unlock_irqrestore(&uhci->lock, flags);
1131 return 0;
1132}
1133
Alan Stern0ed8fee2005-12-17 18:02:38 -05001134/*
1135 * Finish unlinking an URB and give it back
1136 */
1137static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh,
1138 struct urb *urb, struct pt_regs *regs)
1139__releases(uhci->lock)
1140__acquires(uhci->lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001142 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143
Alan Stern0ed8fee2005-12-17 18:02:38 -05001144 /* Isochronous TDs get unlinked directly from the frame list */
Alan Stern4de7d2c2006-05-05 16:26:58 -04001145 if (qh->type == USB_ENDPOINT_XFER_ISOC)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001146 uhci_unlink_isochronous_tds(uhci, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
Alan Stern0ed8fee2005-12-17 18:02:38 -05001148 /* Take the URB off the QH's queue. If the queue is now empty,
1149 * this is a perfect time for a toggle fixup. */
1150 list_del_init(&urbp->node);
1151 if (list_empty(&qh->queue) && qh->needs_fixup) {
1152 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1153 usb_pipeout(urb->pipe), qh->initial_toggle);
1154 qh->needs_fixup = 0;
1155 }
1156
1157 uhci_dec_fsbr(uhci, urb); /* Safe since it checks */
1158 uhci_free_urb_priv(uhci, urbp);
1159
Alan Stern4de7d2c2006-05-05 16:26:58 -04001160 switch (qh->type) {
1161 case USB_ENDPOINT_XFER_ISOC:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001162 /* Release bandwidth for Interrupt or Isoc. transfers */
1163 if (urb->bandwidth)
1164 usb_release_bandwidth(urb->dev, urb, 1);
1165 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001166 case USB_ENDPOINT_XFER_INT:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001167 /* Release bandwidth for Interrupt or Isoc. transfers */
1168 /* Make sure we don't release if we have a queued URB */
1169 if (list_empty(&qh->queue) && urb->bandwidth)
1170 usb_release_bandwidth(urb->dev, urb, 0);
1171 else
1172 /* bandwidth was passed on to queued URB, */
1173 /* so don't let usb_unlink_urb() release it */
1174 urb->bandwidth = 0;
1175 break;
1176 }
1177
1178 spin_unlock(&uhci->lock);
1179 usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, regs);
1180 spin_lock(&uhci->lock);
1181
1182 /* If the queue is now empty, we can unlink the QH and give up its
1183 * reserved bandwidth. */
1184 if (list_empty(&qh->queue)) {
1185 uhci_unlink_qh(uhci, qh);
1186
1187 /* Bandwidth stuff not yet implemented */
1188 }
1189}
1190
1191/*
1192 * Scan the URBs in a QH's queue
1193 */
1194#define QH_FINISHED_UNLINKING(qh) \
1195 (qh->state == QH_STATE_UNLINKING && \
1196 uhci->frame_number + uhci->is_stopped != qh->unlink_frame)
1197
1198static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh,
1199 struct pt_regs *regs)
1200{
1201 struct urb_priv *urbp;
1202 struct urb *urb;
1203 int status;
1204
1205 while (!list_empty(&qh->queue)) {
1206 urbp = list_entry(qh->queue.next, struct urb_priv, node);
1207 urb = urbp->urb;
1208
Alan Sternb1869002006-05-12 11:14:25 -04001209 if (qh->type == USB_ENDPOINT_XFER_ISOC)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001210 status = uhci_result_isochronous(uhci, urb);
Alan Sternb1869002006-05-12 11:14:25 -04001211 else
Alan Stern0ed8fee2005-12-17 18:02:38 -05001212 status = uhci_result_common(uhci, urb);
Alan Stern0ed8fee2005-12-17 18:02:38 -05001213 if (status == -EINPROGRESS)
1214 break;
1215
1216 spin_lock(&urb->lock);
1217 if (urb->status == -EINPROGRESS) /* Not dequeued */
1218 urb->status = status;
1219 else
Alan Stern27755622006-05-05 16:32:02 -04001220 status = ECONNRESET; /* Not -ECONNRESET */
Alan Stern0ed8fee2005-12-17 18:02:38 -05001221 spin_unlock(&urb->lock);
1222
1223 /* Dequeued but completed URBs can't be given back unless
1224 * the QH is stopped or has finished unlinking. */
Alan Stern27755622006-05-05 16:32:02 -04001225 if (status == ECONNRESET) {
1226 if (QH_FINISHED_UNLINKING(qh))
1227 qh->is_stopped = 1;
1228 else if (!qh->is_stopped)
1229 return;
1230 }
Alan Stern0ed8fee2005-12-17 18:02:38 -05001231
1232 uhci_giveback_urb(uhci, qh, urb, regs);
Alan Stern27755622006-05-05 16:32:02 -04001233 if (status < 0)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001234 break;
1235 }
1236
1237 /* If the QH is neither stopped nor finished unlinking (normal case),
1238 * our work here is done. */
Alan Stern27755622006-05-05 16:32:02 -04001239 if (QH_FINISHED_UNLINKING(qh))
1240 qh->is_stopped = 1;
1241 else if (!qh->is_stopped)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001242 return;
1243
1244 /* Otherwise give back each of the dequeued URBs */
Alan Stern27755622006-05-05 16:32:02 -04001245restart:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001246 list_for_each_entry(urbp, &qh->queue, node) {
1247 urb = urbp->urb;
1248 if (urb->status != -EINPROGRESS) {
Alan Sterna0b458b2006-05-12 11:23:19 -04001249 uhci_cleanup_queue(qh, urb);
Alan Stern0ed8fee2005-12-17 18:02:38 -05001250 uhci_giveback_urb(uhci, qh, urb, regs);
1251 goto restart;
1252 }
1253 }
1254 qh->is_stopped = 0;
1255
1256 /* There are no more dequeued URBs. If there are still URBs on the
1257 * queue, the QH can now be re-activated. */
1258 if (!list_empty(&qh->queue)) {
1259 if (qh->needs_fixup)
1260 uhci_fixup_toggles(qh, 0);
1261 uhci_activate_qh(uhci, qh);
1262 }
1263
1264 /* The queue is empty. The QH can become idle if it is fully
1265 * unlinked. */
1266 else if (QH_FINISHED_UNLINKING(qh))
1267 uhci_make_qh_idle(uhci, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268}
1269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270static void uhci_free_pending_tds(struct uhci_hcd *uhci)
1271{
1272 struct uhci_td *td, *tmp;
1273
1274 list_for_each_entry_safe(td, tmp, &uhci->td_remove_list, remove_list) {
1275 list_del_init(&td->remove_list);
1276
1277 uhci_free_td(uhci, td);
1278 }
1279}
1280
Alan Stern0ed8fee2005-12-17 18:02:38 -05001281/*
1282 * Process events in the schedule, but only in one thread at a time
1283 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs)
1285{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001286 int i;
1287 struct uhci_qh *qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288
1289 /* Don't allow re-entrant calls */
1290 if (uhci->scan_in_progress) {
1291 uhci->need_rescan = 1;
1292 return;
1293 }
1294 uhci->scan_in_progress = 1;
1295 rescan:
1296 uhci->need_rescan = 0;
1297
Alan Stern6c1b4452005-04-21 16:04:58 -04001298 uhci_clear_next_interrupt(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 uhci_get_current_frame_number(uhci);
1300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age)
1302 uhci_free_pending_tds(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
Alan Stern0ed8fee2005-12-17 18:02:38 -05001304 /* Go through all the QH queues and process the URBs in each one */
1305 for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) {
1306 uhci->next_qh = list_entry(uhci->skelqh[i]->node.next,
1307 struct uhci_qh, node);
1308 while ((qh = uhci->next_qh) != uhci->skelqh[i]) {
1309 uhci->next_qh = list_entry(qh->node.next,
1310 struct uhci_qh, node);
1311 uhci_scan_qh(uhci, qh, regs);
1312 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
1315 if (uhci->need_rescan)
1316 goto rescan;
1317 uhci->scan_in_progress = 0;
1318
Alan Stern0ed8fee2005-12-17 18:02:38 -05001319 /* If the controller is stopped, we can finish these off right now */
1320 if (uhci->is_stopped)
1321 uhci_free_pending_tds(uhci);
Alan Sterndccf4a42005-12-17 17:58:46 -05001322
1323 if (list_empty(&uhci->td_remove_list) &&
1324 list_empty(&uhci->skel_unlink_qh->node))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 uhci_clear_next_interrupt(uhci);
1326 else
1327 uhci_set_next_interrupt(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328}
Alan Sternf5946f82005-04-09 17:26:00 -04001329
1330static void check_fsbr(struct uhci_hcd *uhci)
1331{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001332 /* For now, don't scan URBs for FSBR timeouts.
1333 * Add it back in later... */
Alan Sternf5946f82005-04-09 17:26:00 -04001334
1335 /* Really disable FSBR */
1336 if (!uhci->fsbr && uhci->fsbrtimeout && time_after_eq(jiffies, uhci->fsbrtimeout)) {
1337 uhci->fsbrtimeout = 0;
1338 uhci->skel_term_qh->link = UHCI_PTR_TERM;
1339 }
1340}