blob: 8639e903593198d3be67276c0928dfd3f6b30b88 [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
164 qh->dma_handle = dma_handle;
165
166 qh->element = UHCI_PTR_TERM;
167 qh->link = UHCI_PTR_TERM;
168
Alan Sterndccf4a42005-12-17 17:58:46 -0500169 INIT_LIST_HEAD(&qh->queue);
170 INIT_LIST_HEAD(&qh->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Alan Sterndccf4a42005-12-17 17:58:46 -0500172 if (udev) { /* Normal QH */
Alan Sternaf0bb592005-12-17 18:00:12 -0500173 qh->dummy_td = uhci_alloc_td(uhci);
174 if (!qh->dummy_td) {
175 dma_pool_free(uhci->qh_pool, qh, dma_handle);
176 return NULL;
177 }
Alan Sterndccf4a42005-12-17 17:58:46 -0500178 qh->state = QH_STATE_IDLE;
179 qh->hep = hep;
180 qh->udev = udev;
181 hep->hcpriv = qh;
Alan Stern4de7d2c2006-05-05 16:26:58 -0400182 qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Alan Sterndccf4a42005-12-17 17:58:46 -0500184 } else { /* Skeleton QH */
185 qh->state = QH_STATE_ACTIVE;
186 qh->udev = NULL;
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 Stern0ed8fee2005-12-17 18:02:38 -0500207 * When the currently executing URB is dequeued, save its current toggle value
208 */
209static void uhci_save_toggle(struct uhci_qh *qh, struct urb *urb)
210{
211 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
212 struct uhci_td *td;
213
214 /* If the QH element pointer is UHCI_PTR_TERM then then currently
215 * executing URB has already been unlinked, so this one isn't it. */
216 if (qh_element(qh) == UHCI_PTR_TERM ||
217 qh->queue.next != &urbp->node)
218 return;
219 qh->element = UHCI_PTR_TERM;
220
221 /* Only bulk and interrupt pipes have to worry about toggles */
Alan Stern4de7d2c2006-05-05 16:26:58 -0400222 if (!(qh->type == USB_ENDPOINT_XFER_BULK ||
223 qh->type == USB_ENDPOINT_XFER_INT))
Alan Stern0ed8fee2005-12-17 18:02:38 -0500224 return;
225
226 /* Find the first active TD; that's the device's toggle state */
227 list_for_each_entry(td, &urbp->td_list, list) {
228 if (td_status(td) & TD_CTRL_ACTIVE) {
229 qh->needs_fixup = 1;
230 qh->initial_toggle = uhci_toggle(td_token(td));
231 return;
232 }
233 }
234
235 WARN_ON(1);
236}
237
238/*
239 * Fix up the data toggles for URBs in a queue, when one of them
240 * terminates early (short transfer, error, or dequeued).
241 */
242static void uhci_fixup_toggles(struct uhci_qh *qh, int skip_first)
243{
244 struct urb_priv *urbp = NULL;
245 struct uhci_td *td;
246 unsigned int toggle = qh->initial_toggle;
247 unsigned int pipe;
248
249 /* Fixups for a short transfer start with the second URB in the
250 * queue (the short URB is the first). */
251 if (skip_first)
252 urbp = list_entry(qh->queue.next, struct urb_priv, node);
253
254 /* When starting with the first URB, if the QH element pointer is
255 * still valid then we know the URB's toggles are okay. */
256 else if (qh_element(qh) != UHCI_PTR_TERM)
257 toggle = 2;
258
259 /* Fix up the toggle for the URBs in the queue. Normally this
260 * loop won't run more than once: When an error or short transfer
261 * occurs, the queue usually gets emptied. */
Alan Stern1393adb2006-01-31 10:02:55 -0500262 urbp = list_prepare_entry(urbp, &qh->queue, node);
Alan Stern0ed8fee2005-12-17 18:02:38 -0500263 list_for_each_entry_continue(urbp, &qh->queue, node) {
264
265 /* If the first TD has the right toggle value, we don't
266 * need to change any toggles in this URB */
267 td = list_entry(urbp->td_list.next, struct uhci_td, list);
268 if (toggle > 1 || uhci_toggle(td_token(td)) == toggle) {
269 td = list_entry(urbp->td_list.next, struct uhci_td,
270 list);
271 toggle = uhci_toggle(td_token(td)) ^ 1;
272
273 /* Otherwise all the toggles in the URB have to be switched */
274 } else {
275 list_for_each_entry(td, &urbp->td_list, list) {
276 td->token ^= __constant_cpu_to_le32(
277 TD_TOKEN_TOGGLE);
278 toggle ^= 1;
279 }
280 }
281 }
282
283 wmb();
284 pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe;
285 usb_settoggle(qh->udev, usb_pipeendpoint(pipe),
286 usb_pipeout(pipe), toggle);
287 qh->needs_fixup = 0;
288}
289
290/*
Alan Sterndccf4a42005-12-17 17:58:46 -0500291 * Put a QH on the schedule in both hardware and software
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500293static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Alan Sterndccf4a42005-12-17 17:58:46 -0500295 struct uhci_qh *pqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Alan Sterndccf4a42005-12-17 17:58:46 -0500297 WARN_ON(list_empty(&qh->queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Alan Sterndccf4a42005-12-17 17:58:46 -0500299 /* Set the element pointer if it isn't set already.
300 * This isn't needed for Isochronous queues, but it doesn't hurt. */
301 if (qh_element(qh) == UHCI_PTR_TERM) {
302 struct urb_priv *urbp = list_entry(qh->queue.next,
303 struct urb_priv, node);
304 struct uhci_td *td = list_entry(urbp->td_list.next,
305 struct uhci_td, list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Alan Sterndccf4a42005-12-17 17:58:46 -0500307 qh->element = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
309
Alan Sterndccf4a42005-12-17 17:58:46 -0500310 if (qh->state == QH_STATE_ACTIVE)
311 return;
312 qh->state = QH_STATE_ACTIVE;
313
314 /* Move the QH from its old list to the end of the appropriate
315 * skeleton's list */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500316 if (qh == uhci->next_qh)
317 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
318 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500319 list_move_tail(&qh->node, &qh->skel->node);
320
321 /* Link it into the schedule */
322 pqh = list_entry(qh->node.prev, struct uhci_qh, node);
323 qh->link = pqh->link;
324 wmb();
325 pqh->link = UHCI_PTR_QH | cpu_to_le32(qh->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
328/*
Alan Sterndccf4a42005-12-17 17:58:46 -0500329 * Take a QH off the hardware schedule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500331static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
333 struct uhci_qh *pqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Alan Sterndccf4a42005-12-17 17:58:46 -0500335 if (qh->state == QH_STATE_UNLINKING)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 return;
Alan Sterndccf4a42005-12-17 17:58:46 -0500337 WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev);
338 qh->state = QH_STATE_UNLINKING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Alan Sterndccf4a42005-12-17 17:58:46 -0500340 /* Unlink the QH from the schedule and record when we did it */
341 pqh = list_entry(qh->node.prev, struct uhci_qh, node);
342 pqh->link = qh->link;
343 mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 uhci_get_current_frame_number(uhci);
Alan Sterndccf4a42005-12-17 17:58:46 -0500346 qh->unlink_frame = uhci->frame_number;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Alan Sterndccf4a42005-12-17 17:58:46 -0500348 /* Force an interrupt so we know when the QH is fully unlinked */
349 if (list_empty(&uhci->skel_unlink_qh->node))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 uhci_set_next_interrupt(uhci);
351
Alan Sterndccf4a42005-12-17 17:58:46 -0500352 /* Move the QH from its old list to the end of the unlinking list */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500353 if (qh == uhci->next_qh)
354 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
355 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500356 list_move_tail(&qh->node, &uhci->skel_unlink_qh->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
Alan Sterndccf4a42005-12-17 17:58:46 -0500359/*
360 * When we and the controller are through with a QH, it becomes IDLE.
361 * This happens when a QH has been off the schedule (on the unlinking
362 * list) for more than one frame, or when an error occurs while adding
363 * the first URB onto a new QH.
364 */
365static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Alan Sterndccf4a42005-12-17 17:58:46 -0500367 WARN_ON(qh->state == QH_STATE_ACTIVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Alan Stern0ed8fee2005-12-17 18:02:38 -0500369 if (qh == uhci->next_qh)
370 uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
371 node);
Alan Sterndccf4a42005-12-17 17:58:46 -0500372 list_move(&qh->node, &uhci->idle_qh_list);
373 qh->state = QH_STATE_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Alan Sterndccf4a42005-12-17 17:58:46 -0500375 /* If anyone is waiting for a QH to become idle, wake them up */
376 if (uhci->num_waiting)
377 wake_up_all(&uhci->waitqh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
Alan Sterndccf4a42005-12-17 17:58:46 -0500380static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci,
381 struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
383 struct urb_priv *urbp;
384
385 urbp = kmem_cache_alloc(uhci_up_cachep, SLAB_ATOMIC);
386 if (!urbp)
387 return NULL;
388
389 memset((void *)urbp, 0, sizeof(*urbp));
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 urbp->urb = urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 urb->hcpriv = urbp;
Alan Sterndccf4a42005-12-17 17:58:46 -0500393
394 INIT_LIST_HEAD(&urbp->node);
395 INIT_LIST_HEAD(&urbp->td_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397 return urbp;
398}
399
400static void uhci_add_td_to_urb(struct urb *urb, struct uhci_td *td)
401{
402 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 list_add_tail(&td->list, &urbp->td_list);
405}
406
407static void uhci_remove_td_from_urb(struct uhci_td *td)
408{
409 if (list_empty(&td->list))
410 return;
411
412 list_del_init(&td->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414
Alan Sterndccf4a42005-12-17 17:58:46 -0500415static void uhci_free_urb_priv(struct uhci_hcd *uhci,
416 struct urb_priv *urbp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417{
418 struct uhci_td *td, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Alan Sterndccf4a42005-12-17 17:58:46 -0500420 if (!list_empty(&urbp->node))
421 dev_warn(uhci_dev(uhci), "urb %p still on QH's list!\n",
422 urbp->urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424 uhci_get_current_frame_number(uhci);
425 if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) {
426 uhci_free_pending_tds(uhci);
427 uhci->td_remove_age = uhci->frame_number;
428 }
429
430 /* Check to see if the remove list is empty. Set the IOC bit */
Alan Sterndccf4a42005-12-17 17:58:46 -0500431 /* to force an interrupt so we can remove the TDs. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 if (list_empty(&uhci->td_remove_list))
433 uhci_set_next_interrupt(uhci);
434
435 list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
436 uhci_remove_td_from_urb(td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 list_add(&td->remove_list, &uhci->td_remove_list);
438 }
439
Alan Sterndccf4a42005-12-17 17:58:46 -0500440 urbp->urb->hcpriv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 kmem_cache_free(uhci_up_cachep, urbp);
442}
443
444static void uhci_inc_fsbr(struct uhci_hcd *uhci, struct urb *urb)
445{
446 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
447
448 if ((!(urb->transfer_flags & URB_NO_FSBR)) && !urbp->fsbr) {
449 urbp->fsbr = 1;
450 if (!uhci->fsbr++ && !uhci->fsbrtimeout)
451 uhci->skel_term_qh->link = cpu_to_le32(uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
452 }
453}
454
455static void uhci_dec_fsbr(struct uhci_hcd *uhci, struct urb *urb)
456{
457 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
458
459 if ((!(urb->transfer_flags & URB_NO_FSBR)) && urbp->fsbr) {
460 urbp->fsbr = 0;
461 if (!--uhci->fsbr)
462 uhci->fsbrtimeout = jiffies + FSBR_DELAY;
463 }
464}
465
466/*
467 * Map status to standard result codes
468 *
469 * <status> is (td_status(td) & 0xF60000), a.k.a.
470 * uhci_status_bits(td_status(td)).
471 * Note: <status> does not include the TD_CTRL_NAK bit.
472 * <dir_out> is True for output TDs and False for input TDs.
473 */
474static int uhci_map_status(int status, int dir_out)
475{
476 if (!status)
477 return 0;
478 if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */
479 return -EPROTO;
480 if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */
481 if (dir_out)
482 return -EPROTO;
483 else
484 return -EILSEQ;
485 }
486 if (status & TD_CTRL_BABBLE) /* Babble */
487 return -EOVERFLOW;
488 if (status & TD_CTRL_DBUFERR) /* Buffer error */
489 return -ENOSR;
490 if (status & TD_CTRL_STALLED) /* Stalled */
491 return -EPIPE;
492 WARN_ON(status & TD_CTRL_ACTIVE); /* Active */
493 return 0;
494}
495
496/*
497 * Control transfers
498 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500499static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
500 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 struct uhci_td *td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 unsigned long destination, status;
Alan Sterndccf4a42005-12-17 17:58:46 -0500504 int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 int len = urb->transfer_buffer_length;
506 dma_addr_t data = urb->transfer_dma;
Alan Sterndccf4a42005-12-17 17:58:46 -0500507 __le32 *plink;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 /* The "pipe" thing contains the destination in bits 8--18 */
510 destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
511
Alan Sternaf0bb592005-12-17 18:00:12 -0500512 /* 3 errors, dummy TD remains inactive */
513 status = uhci_maxerr(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 if (urb->dev->speed == USB_SPEED_LOW)
515 status |= TD_CTRL_LS;
516
517 /*
518 * Build the TD for the control request setup packet
519 */
Alan Sternaf0bb592005-12-17 18:00:12 -0500520 td = qh->dummy_td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 uhci_add_td_to_urb(urb, td);
Alan Sternfa346562005-11-30 11:57:51 -0500522 uhci_fill_td(td, status, destination | uhci_explen(8),
Alan Sterndccf4a42005-12-17 17:58:46 -0500523 urb->setup_dma);
524 plink = &td->link;
Alan Sternaf0bb592005-12-17 18:00:12 -0500525 status |= TD_CTRL_ACTIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 /*
528 * If direction is "send", change the packet ID from SETUP (0x2D)
529 * to OUT (0xE1). Else change it from SETUP to IN (0x69) and
530 * set Short Packet Detect (SPD) for all data packets.
531 */
532 if (usb_pipeout(urb->pipe))
533 destination ^= (USB_PID_SETUP ^ USB_PID_OUT);
534 else {
535 destination ^= (USB_PID_SETUP ^ USB_PID_IN);
536 status |= TD_CTRL_SPD;
537 }
538
539 /*
Alan Stern687f5f32005-11-30 17:16:19 -0500540 * Build the DATA TDs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 */
542 while (len > 0) {
Alan Sterndccf4a42005-12-17 17:58:46 -0500543 int pktsze = min(len, maxsze);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Alan Stern25321782005-04-25 11:14:31 -0400545 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500547 goto nomem;
Alan Sterndccf4a42005-12-17 17:58:46 -0500548 *plink = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550 /* Alternate Data0/1 (start with Data1) */
551 destination ^= TD_TOKEN_TOGGLE;
552
553 uhci_add_td_to_urb(urb, td);
Alan Sternfa346562005-11-30 11:57:51 -0500554 uhci_fill_td(td, status, destination | uhci_explen(pktsze),
Alan Sterndccf4a42005-12-17 17:58:46 -0500555 data);
556 plink = &td->link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 data += pktsze;
559 len -= pktsze;
560 }
561
562 /*
563 * Build the final TD for control status
564 */
Alan Stern25321782005-04-25 11:14:31 -0400565 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500567 goto nomem;
Alan Sterndccf4a42005-12-17 17:58:46 -0500568 *plink = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
570 /*
571 * It's IN if the pipe is an output pipe or we're not expecting
572 * data back.
573 */
574 destination &= ~TD_TOKEN_PID_MASK;
575 if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length)
576 destination |= USB_PID_IN;
577 else
578 destination |= USB_PID_OUT;
579
580 destination |= TD_TOKEN_TOGGLE; /* End in Data1 */
581
582 status &= ~TD_CTRL_SPD;
583
584 uhci_add_td_to_urb(urb, td);
585 uhci_fill_td(td, status | TD_CTRL_IOC,
Alan Sterndccf4a42005-12-17 17:58:46 -0500586 destination | uhci_explen(0), 0);
Alan Sternaf0bb592005-12-17 18:00:12 -0500587 plink = &td->link;
588
589 /*
590 * Build the new dummy TD and activate the old one
591 */
592 td = uhci_alloc_td(uhci);
593 if (!td)
594 goto nomem;
595 *plink = cpu_to_le32(td->dma_handle);
596
597 uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
598 wmb();
599 qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
600 qh->dummy_td = td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
602 /* Low-speed transfers get a different queue, and won't hog the bus.
603 * Also, some devices enumerate better without FSBR; the easiest way
604 * to do that is to put URBs on the low-speed queue while the device
Alan Stern630aa3c2006-01-23 17:17:21 -0500605 * isn't in the CONFIGURED state. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if (urb->dev->speed == USB_SPEED_LOW ||
Alan Stern630aa3c2006-01-23 17:17:21 -0500607 urb->dev->state != USB_STATE_CONFIGURED)
Alan Sterndccf4a42005-12-17 17:58:46 -0500608 qh->skel = uhci->skel_ls_control_qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 else {
Alan Sterndccf4a42005-12-17 17:58:46 -0500610 qh->skel = uhci->skel_fs_control_qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 uhci_inc_fsbr(uhci, urb);
612 }
Alan Sterndccf4a42005-12-17 17:58:46 -0500613 return 0;
Alan Sternaf0bb592005-12-17 18:00:12 -0500614
615nomem:
616 /* Remove the dummy TD from the td_list so it doesn't get freed */
617 uhci_remove_td_from_urb(qh->dummy_td);
618 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619}
620
621/*
622 * If control-IN transfer was short, the status packet wasn't sent.
623 * This routine changes the element pointer in the QH to point at the
624 * status TD. It's safe to do this even while the QH is live, because
625 * the hardware only updates the element pointer following a successful
626 * transfer. The inactive TD for the short packet won't cause an update,
627 * so the pointer won't get overwritten. The next time the controller
628 * sees this QH, it will send the status packet.
629 */
630static int usb_control_retrigger_status(struct uhci_hcd *uhci, struct urb *urb)
631{
632 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
633 struct uhci_td *td;
634
Alan Sterndccf4a42005-12-17 17:58:46 -0500635 urbp->short_transfer = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
637 td = list_entry(urbp->td_list.prev, struct uhci_td, list);
638 urbp->qh->element = cpu_to_le32(td->dma_handle);
639
640 return -EINPROGRESS;
641}
642
643
644static int uhci_result_control(struct uhci_hcd *uhci, struct urb *urb)
645{
646 struct list_head *tmp, *head;
647 struct urb_priv *urbp = urb->hcpriv;
648 struct uhci_td *td;
649 unsigned int status;
650 int ret = 0;
651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 head = &urbp->td_list;
Alan Sterndccf4a42005-12-17 17:58:46 -0500653 if (urbp->short_transfer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 tmp = head->prev;
655 goto status_stage;
656 }
657
Alan Sterndccf4a42005-12-17 17:58:46 -0500658 urb->actual_length = 0;
659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 tmp = head->next;
661 td = list_entry(tmp, struct uhci_td, list);
662
663 /* The first TD is the SETUP stage, check the status, but skip */
664 /* the count */
665 status = uhci_status_bits(td_status(td));
666 if (status & TD_CTRL_ACTIVE)
667 return -EINPROGRESS;
668
669 if (status)
670 goto td_error;
671
Alan Stern687f5f32005-11-30 17:16:19 -0500672 /* The rest of the TDs (but the last) are data */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 tmp = tmp->next;
674 while (tmp != head && tmp->next != head) {
675 unsigned int ctrlstat;
676
677 td = list_entry(tmp, struct uhci_td, list);
678 tmp = tmp->next;
679
680 ctrlstat = td_status(td);
681 status = uhci_status_bits(ctrlstat);
682 if (status & TD_CTRL_ACTIVE)
683 return -EINPROGRESS;
684
685 urb->actual_length += uhci_actual_length(ctrlstat);
686
687 if (status)
688 goto td_error;
689
690 /* Check to see if we received a short packet */
691 if (uhci_actual_length(ctrlstat) <
692 uhci_expected_length(td_token(td))) {
693 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
694 ret = -EREMOTEIO;
695 goto err;
696 }
697
Alan Sterndccf4a42005-12-17 17:58:46 -0500698 return usb_control_retrigger_status(uhci, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 }
700 }
701
702status_stage:
703 td = list_entry(tmp, struct uhci_td, list);
704
705 /* Control status stage */
706 status = td_status(td);
707
708#ifdef I_HAVE_BUGGY_APC_BACKUPS
709 /* APC BackUPS Pro kludge */
710 /* It tries to send all of the descriptor instead of the amount */
711 /* we requested */
712 if (status & TD_CTRL_IOC && /* IOC is masked out by uhci_status_bits */
713 status & TD_CTRL_ACTIVE &&
714 status & TD_CTRL_NAK)
715 return 0;
716#endif
717
718 status = uhci_status_bits(status);
719 if (status & TD_CTRL_ACTIVE)
720 return -EINPROGRESS;
721
722 if (status)
723 goto td_error;
724
725 return 0;
726
727td_error:
728 ret = uhci_map_status(status, uhci_packetout(td_token(td)));
729
730err:
731 if ((debug == 1 && ret != -EPIPE) || debug > 1) {
732 /* Some debugging code */
733 dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
734 __FUNCTION__, status);
735
736 if (errbuf) {
737 /* Print the chain for debugging purposes */
738 uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 lprintk(errbuf);
740 }
741 }
742
Alan Stern0ed8fee2005-12-17 18:02:38 -0500743 /* Note that the queue has stopped */
744 urbp->qh->element = UHCI_PTR_TERM;
745 urbp->qh->is_stopped = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 return ret;
747}
748
749/*
750 * Common submit for bulk and interrupt
751 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500752static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
753 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754{
755 struct uhci_td *td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 unsigned long destination, status;
Alan Sterndccf4a42005-12-17 17:58:46 -0500757 int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 int len = urb->transfer_buffer_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 dma_addr_t data = urb->transfer_dma;
Alan Sternaf0bb592005-12-17 18:00:12 -0500760 __le32 *plink;
761 unsigned int toggle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
763 if (len < 0)
764 return -EINVAL;
765
766 /* The "pipe" thing contains the destination in bits 8--18 */
767 destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
Alan Sternaf0bb592005-12-17 18:00:12 -0500768 toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
769 usb_pipeout(urb->pipe));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Alan Sternaf0bb592005-12-17 18:00:12 -0500771 /* 3 errors, dummy TD remains inactive */
772 status = uhci_maxerr(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 if (urb->dev->speed == USB_SPEED_LOW)
774 status |= TD_CTRL_LS;
775 if (usb_pipein(urb->pipe))
776 status |= TD_CTRL_SPD;
777
778 /*
Alan Stern687f5f32005-11-30 17:16:19 -0500779 * Build the DATA TDs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 */
Alan Sternaf0bb592005-12-17 18:00:12 -0500781 plink = NULL;
782 td = qh->dummy_td;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 do { /* Allow zero length packets */
784 int pktsze = maxsze;
785
Alan Sterndccf4a42005-12-17 17:58:46 -0500786 if (len <= pktsze) { /* The last packet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 pktsze = len;
788 if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
789 status &= ~TD_CTRL_SPD;
790 }
791
Alan Sternaf0bb592005-12-17 18:00:12 -0500792 if (plink) {
793 td = uhci_alloc_td(uhci);
794 if (!td)
795 goto nomem;
796 *plink = cpu_to_le32(td->dma_handle);
797 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 uhci_add_td_to_urb(urb, td);
Alan Sterndccf4a42005-12-17 17:58:46 -0500799 uhci_fill_td(td, status,
Alan Sternaf0bb592005-12-17 18:00:12 -0500800 destination | uhci_explen(pktsze) |
801 (toggle << TD_TOKEN_TOGGLE_SHIFT),
802 data);
Alan Sterndccf4a42005-12-17 17:58:46 -0500803 plink = &td->link;
Alan Sternaf0bb592005-12-17 18:00:12 -0500804 status |= TD_CTRL_ACTIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
806 data += pktsze;
807 len -= maxsze;
Alan Sternaf0bb592005-12-17 18:00:12 -0500808 toggle ^= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 } while (len > 0);
810
811 /*
812 * URB_ZERO_PACKET means adding a 0-length packet, if direction
813 * is OUT and the transfer_length was an exact multiple of maxsze,
814 * hence (len = transfer_length - N * maxsze) == 0
815 * however, if transfer_length == 0, the zero packet was already
816 * prepared above.
817 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500818 if ((urb->transfer_flags & URB_ZERO_PACKET) &&
819 usb_pipeout(urb->pipe) && len == 0 &&
820 urb->transfer_buffer_length > 0) {
Alan Stern25321782005-04-25 11:14:31 -0400821 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 if (!td)
Alan Sternaf0bb592005-12-17 18:00:12 -0500823 goto nomem;
Alan Sterndccf4a42005-12-17 17:58:46 -0500824 *plink = cpu_to_le32(td->dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 uhci_add_td_to_urb(urb, td);
Alan Sternaf0bb592005-12-17 18:00:12 -0500827 uhci_fill_td(td, status,
828 destination | uhci_explen(0) |
829 (toggle << TD_TOKEN_TOGGLE_SHIFT),
830 data);
831 plink = &td->link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
Alan Sternaf0bb592005-12-17 18:00:12 -0500833 toggle ^= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 }
835
836 /* Set the interrupt-on-completion flag on the last packet.
837 * A more-or-less typical 4 KB URB (= size of one memory page)
838 * will require about 3 ms to transfer; that's a little on the
839 * fast side but not enough to justify delaying an interrupt
840 * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
841 * flag setting. */
Alan Sterndccf4a42005-12-17 17:58:46 -0500842 td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Alan Sternaf0bb592005-12-17 18:00:12 -0500844 /*
845 * Build the new dummy TD and activate the old one
846 */
847 td = uhci_alloc_td(uhci);
848 if (!td)
849 goto nomem;
850 *plink = cpu_to_le32(td->dma_handle);
851
852 uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
853 wmb();
854 qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
855 qh->dummy_td = td;
856
857 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
858 usb_pipeout(urb->pipe), toggle);
Alan Sterndccf4a42005-12-17 17:58:46 -0500859 return 0;
Alan Sternaf0bb592005-12-17 18:00:12 -0500860
861nomem:
862 /* Remove the dummy TD from the td_list so it doesn't get freed */
863 uhci_remove_td_from_urb(qh->dummy_td);
864 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865}
866
867/*
868 * Common result for bulk and interrupt
869 */
870static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
871{
872 struct urb_priv *urbp = urb->hcpriv;
873 struct uhci_td *td;
874 unsigned int status = 0;
875 int ret = 0;
876
877 urb->actual_length = 0;
878
879 list_for_each_entry(td, &urbp->td_list, list) {
880 unsigned int ctrlstat = td_status(td);
881
882 status = uhci_status_bits(ctrlstat);
883 if (status & TD_CTRL_ACTIVE)
884 return -EINPROGRESS;
885
886 urb->actual_length += uhci_actual_length(ctrlstat);
887
888 if (status)
889 goto td_error;
890
891 if (uhci_actual_length(ctrlstat) <
892 uhci_expected_length(td_token(td))) {
893 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
894 ret = -EREMOTEIO;
895 goto err;
Alan Sterndccf4a42005-12-17 17:58:46 -0500896 }
897
898 /*
899 * This URB stopped short of its end. We have to
900 * fix up the toggles of the following URBs on the
901 * queue and restart the queue.
902 *
903 * Do this only the first time we encounter the
904 * short URB.
905 */
906 if (!urbp->short_transfer) {
907 urbp->short_transfer = 1;
Alan Stern0ed8fee2005-12-17 18:02:38 -0500908 urbp->qh->initial_toggle =
909 uhci_toggle(td_token(td)) ^ 1;
910 uhci_fixup_toggles(urbp->qh, 1);
911
Alan Sterndccf4a42005-12-17 17:58:46 -0500912 td = list_entry(urbp->td_list.prev,
913 struct uhci_td, list);
914 urbp->qh->element = td->link;
915 }
916 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 }
918 }
919
920 return 0;
921
922td_error:
923 ret = uhci_map_status(status, uhci_packetout(td_token(td)));
924
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 if ((debug == 1 && ret != -EPIPE) || debug > 1) {
926 /* Some debugging code */
927 dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
928 __FUNCTION__, status);
929
Alan Stern8d402e12005-12-17 18:03:37 -0500930 if (debug > 1 && errbuf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 /* Print the chain for debugging purposes */
932 uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 lprintk(errbuf);
934 }
935 }
Alan Sterndbf4fca2005-12-20 09:58:08 -0500936err:
Alan Stern0ed8fee2005-12-17 18:02:38 -0500937
938 /* Note that the queue has stopped and save the next toggle value */
939 urbp->qh->element = UHCI_PTR_TERM;
940 urbp->qh->is_stopped = 1;
941 urbp->qh->needs_fixup = 1;
942 urbp->qh->initial_toggle = uhci_toggle(td_token(td)) ^
943 (ret == -EREMOTEIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 return ret;
945}
946
Alan Sterndccf4a42005-12-17 17:58:46 -0500947static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb,
948 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
950 int ret;
951
952 /* Can't have low-speed bulk transfers */
953 if (urb->dev->speed == USB_SPEED_LOW)
954 return -EINVAL;
955
Alan Sterndccf4a42005-12-17 17:58:46 -0500956 qh->skel = uhci->skel_bulk_qh;
957 ret = uhci_submit_common(uhci, urb, qh);
958 if (ret == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 uhci_inc_fsbr(uhci, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 return ret;
961}
962
Alan Sterndccf4a42005-12-17 17:58:46 -0500963static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb,
964 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965{
Alan Sterndccf4a42005-12-17 17:58:46 -0500966 /* USB 1.1 interrupt transfers only involve one packet per interval.
967 * Drivers can submit URBs of any length, but longer ones will need
968 * multiple intervals to complete.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500970 qh->skel = uhci->skelqh[__interval_to_skel(urb->interval)];
971 return uhci_submit_common(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972}
973
974/*
975 * Isochronous transfers
976 */
Alan Sterndccf4a42005-12-17 17:58:46 -0500977static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb,
978 struct uhci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979{
Alan Sterndccf4a42005-12-17 17:58:46 -0500980 struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */
Alan Stern0ed8fee2005-12-17 18:02:38 -0500981 int i, frame;
Alan Sterndccf4a42005-12-17 17:58:46 -0500982 unsigned long destination, status;
Alan Sternb81d3432005-10-13 17:00:24 -0400983 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
Alan Stern0ed8fee2005-12-17 18:02:38 -0500985 if (urb->number_of_packets > 900) /* 900? Why? */
986 return -EFBIG;
987
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
989 destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
990
Alan Stern0ed8fee2005-12-17 18:02:38 -0500991 /* Figure out the starting frame number */
992 if (urb->transfer_flags & URB_ISO_ASAP) {
993 if (list_empty(&qh->queue)) {
994 uhci_get_current_frame_number(uhci);
995 urb->start_frame = (uhci->frame_number + 10);
996
997 } else { /* Go right after the last one */
998 struct urb *last_urb;
999
1000 last_urb = list_entry(qh->queue.prev,
1001 struct urb_priv, node)->urb;
1002 urb->start_frame = (last_urb->start_frame +
1003 last_urb->number_of_packets *
1004 last_urb->interval);
1005 }
1006 } else {
1007 /* FIXME: Sanity check */
1008 }
1009 urb->start_frame &= (UHCI_NUMFRAMES - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
Alan Sternb81d3432005-10-13 17:00:24 -04001011 for (i = 0; i < urb->number_of_packets; i++) {
Alan Stern25321782005-04-25 11:14:31 -04001012 td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 if (!td)
1014 return -ENOMEM;
1015
1016 uhci_add_td_to_urb(urb, td);
Alan Sterndccf4a42005-12-17 17:58:46 -05001017 uhci_fill_td(td, status, destination |
1018 uhci_explen(urb->iso_frame_desc[i].length),
1019 urb->transfer_dma +
1020 urb->iso_frame_desc[i].offset);
Alan Sternb81d3432005-10-13 17:00:24 -04001021 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Alan Sterndccf4a42005-12-17 17:58:46 -05001023 /* Set the interrupt-on-completion flag on the last packet. */
1024 td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
1025
1026 qh->skel = uhci->skel_iso_qh;
1027
1028 /* Add the TDs to the frame list */
Alan Sternb81d3432005-10-13 17:00:24 -04001029 frame = urb->start_frame;
1030 list_for_each_entry(td, &urbp->td_list, list) {
Alan Sterndccf4a42005-12-17 17:58:46 -05001031 uhci_insert_td_in_frame_list(uhci, td, frame);
Alan Sternb81d3432005-10-13 17:00:24 -04001032 frame += urb->interval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 }
1034
Alan Sterndccf4a42005-12-17 17:58:46 -05001035 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036}
1037
1038static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
1039{
1040 struct uhci_td *td;
1041 struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
1042 int status;
1043 int i, ret = 0;
1044
Alan Sternb81d3432005-10-13 17:00:24 -04001045 urb->actual_length = urb->error_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
1047 i = 0;
1048 list_for_each_entry(td, &urbp->td_list, list) {
1049 int actlength;
1050 unsigned int ctrlstat = td_status(td);
1051
1052 if (ctrlstat & TD_CTRL_ACTIVE)
1053 return -EINPROGRESS;
1054
1055 actlength = uhci_actual_length(ctrlstat);
1056 urb->iso_frame_desc[i].actual_length = actlength;
1057 urb->actual_length += actlength;
1058
1059 status = uhci_map_status(uhci_status_bits(ctrlstat),
1060 usb_pipeout(urb->pipe));
1061 urb->iso_frame_desc[i].status = status;
1062 if (status) {
1063 urb->error_count++;
1064 ret = status;
1065 }
1066
1067 i++;
1068 }
1069
1070 return ret;
1071}
1072
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073static int uhci_urb_enqueue(struct usb_hcd *hcd,
Alan Sterndccf4a42005-12-17 17:58:46 -05001074 struct usb_host_endpoint *hep,
Al Viro55016f12005-10-21 03:21:58 -04001075 struct urb *urb, gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076{
1077 int ret;
1078 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1079 unsigned long flags;
Alan Sterndccf4a42005-12-17 17:58:46 -05001080 struct urb_priv *urbp;
1081 struct uhci_qh *qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 int bustime;
1083
1084 spin_lock_irqsave(&uhci->lock, flags);
1085
1086 ret = urb->status;
1087 if (ret != -EINPROGRESS) /* URB already unlinked! */
Alan Sterndccf4a42005-12-17 17:58:46 -05001088 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089
Alan Sterndccf4a42005-12-17 17:58:46 -05001090 ret = -ENOMEM;
1091 urbp = uhci_alloc_urb_priv(uhci, urb);
1092 if (!urbp)
1093 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Alan Sterndccf4a42005-12-17 17:58:46 -05001095 if (hep->hcpriv)
1096 qh = (struct uhci_qh *) hep->hcpriv;
1097 else {
1098 qh = uhci_alloc_qh(uhci, urb->dev, hep);
1099 if (!qh)
1100 goto err_no_qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 }
Alan Sterndccf4a42005-12-17 17:58:46 -05001102 urbp->qh = qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
Alan Stern4de7d2c2006-05-05 16:26:58 -04001104 switch (qh->type) {
1105 case USB_ENDPOINT_XFER_CONTROL:
Alan Sterndccf4a42005-12-17 17:58:46 -05001106 ret = uhci_submit_control(uhci, urb, qh);
1107 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001108 case USB_ENDPOINT_XFER_BULK:
Alan Sterndccf4a42005-12-17 17:58:46 -05001109 ret = uhci_submit_bulk(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001111 case USB_ENDPOINT_XFER_INT:
Alan Sterndccf4a42005-12-17 17:58:46 -05001112 if (list_empty(&qh->queue)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 bustime = usb_check_bandwidth(urb->dev, urb);
1114 if (bustime < 0)
1115 ret = bustime;
1116 else {
Alan Sterndccf4a42005-12-17 17:58:46 -05001117 ret = uhci_submit_interrupt(uhci, urb, qh);
1118 if (ret == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 usb_claim_bandwidth(urb->dev, urb, bustime, 0);
1120 }
1121 } else { /* inherit from parent */
Alan Sterndccf4a42005-12-17 17:58:46 -05001122 struct urb_priv *eurbp;
1123
1124 eurbp = list_entry(qh->queue.prev, struct urb_priv,
1125 node);
1126 urb->bandwidth = eurbp->urb->bandwidth;
1127 ret = uhci_submit_interrupt(uhci, urb, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 }
1129 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001130 case USB_ENDPOINT_XFER_ISOC:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 bustime = usb_check_bandwidth(urb->dev, urb);
1132 if (bustime < 0) {
1133 ret = bustime;
1134 break;
1135 }
1136
Alan Sterndccf4a42005-12-17 17:58:46 -05001137 ret = uhci_submit_isochronous(uhci, urb, qh);
1138 if (ret == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 usb_claim_bandwidth(urb->dev, urb, bustime, 1);
1140 break;
1141 }
Alan Sterndccf4a42005-12-17 17:58:46 -05001142 if (ret != 0)
1143 goto err_submit_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
Alan Sterndccf4a42005-12-17 17:58:46 -05001145 /* Add this URB to the QH */
1146 urbp->qh = qh;
1147 list_add_tail(&urbp->node, &qh->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
Alan Sterndccf4a42005-12-17 17:58:46 -05001149 /* If the new URB is the first and only one on this QH then either
1150 * the QH is new and idle or else it's unlinked and waiting to
1151 * become idle, so we can activate it right away. */
1152 if (qh->queue.next == &urbp->node)
1153 uhci_activate_qh(uhci, qh);
Alan Sterndccf4a42005-12-17 17:58:46 -05001154 goto done;
1155
1156err_submit_failed:
1157 if (qh->state == QH_STATE_IDLE)
1158 uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */
1159
1160err_no_qh:
1161 uhci_free_urb_priv(uhci, urbp);
1162
1163done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 spin_unlock_irqrestore(&uhci->lock, flags);
1165 return ret;
1166}
1167
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
1169{
1170 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1171 unsigned long flags;
1172 struct urb_priv *urbp;
1173
1174 spin_lock_irqsave(&uhci->lock, flags);
1175 urbp = urb->hcpriv;
1176 if (!urbp) /* URB was never linked! */
1177 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
Alan Sterndccf4a42005-12-17 17:58:46 -05001179 /* Remove Isochronous TDs from the frame list ASAP */
Alan Stern4de7d2c2006-05-05 16:26:58 -04001180 if (urbp->qh->type == USB_ENDPOINT_XFER_ISOC)
Alan Sterndccf4a42005-12-17 17:58:46 -05001181 uhci_unlink_isochronous_tds(uhci, urb);
1182 uhci_unlink_qh(uhci, urbp->qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
1184done:
1185 spin_unlock_irqrestore(&uhci->lock, flags);
1186 return 0;
1187}
1188
Alan Stern0ed8fee2005-12-17 18:02:38 -05001189/*
1190 * Finish unlinking an URB and give it back
1191 */
1192static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh,
1193 struct urb *urb, struct pt_regs *regs)
1194__releases(uhci->lock)
1195__acquires(uhci->lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001197 struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Alan Stern0ed8fee2005-12-17 18:02:38 -05001199 /* Isochronous TDs get unlinked directly from the frame list */
Alan Stern4de7d2c2006-05-05 16:26:58 -04001200 if (qh->type == USB_ENDPOINT_XFER_ISOC)
Alan Stern0ed8fee2005-12-17 18:02:38 -05001201 uhci_unlink_isochronous_tds(uhci, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Alan Stern0ed8fee2005-12-17 18:02:38 -05001203 /* If the URB isn't first on its queue, adjust the link pointer
1204 * of the last TD in the previous URB. */
1205 else if (qh->queue.next != &urbp->node) {
1206 struct urb_priv *purbp;
1207 struct uhci_td *ptd, *ltd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208
Alan Stern0ed8fee2005-12-17 18:02:38 -05001209 purbp = list_entry(urbp->node.prev, struct urb_priv, node);
1210 ptd = list_entry(purbp->td_list.prev, struct uhci_td,
1211 list);
1212 ltd = list_entry(urbp->td_list.prev, struct uhci_td,
1213 list);
1214 ptd->link = ltd->link;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 }
1216
Alan Stern0ed8fee2005-12-17 18:02:38 -05001217 /* Take the URB off the QH's queue. If the queue is now empty,
1218 * this is a perfect time for a toggle fixup. */
1219 list_del_init(&urbp->node);
1220 if (list_empty(&qh->queue) && qh->needs_fixup) {
1221 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1222 usb_pipeout(urb->pipe), qh->initial_toggle);
1223 qh->needs_fixup = 0;
1224 }
1225
1226 uhci_dec_fsbr(uhci, urb); /* Safe since it checks */
1227 uhci_free_urb_priv(uhci, urbp);
1228
Alan Stern4de7d2c2006-05-05 16:26:58 -04001229 switch (qh->type) {
1230 case USB_ENDPOINT_XFER_ISOC:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001231 /* Release bandwidth for Interrupt or Isoc. transfers */
1232 if (urb->bandwidth)
1233 usb_release_bandwidth(urb->dev, urb, 1);
1234 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001235 case USB_ENDPOINT_XFER_INT:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001236 /* Release bandwidth for Interrupt or Isoc. transfers */
1237 /* Make sure we don't release if we have a queued URB */
1238 if (list_empty(&qh->queue) && urb->bandwidth)
1239 usb_release_bandwidth(urb->dev, urb, 0);
1240 else
1241 /* bandwidth was passed on to queued URB, */
1242 /* so don't let usb_unlink_urb() release it */
1243 urb->bandwidth = 0;
1244 break;
1245 }
1246
1247 spin_unlock(&uhci->lock);
1248 usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, regs);
1249 spin_lock(&uhci->lock);
1250
1251 /* If the queue is now empty, we can unlink the QH and give up its
1252 * reserved bandwidth. */
1253 if (list_empty(&qh->queue)) {
1254 uhci_unlink_qh(uhci, qh);
1255
1256 /* Bandwidth stuff not yet implemented */
1257 }
1258}
1259
1260/*
1261 * Scan the URBs in a QH's queue
1262 */
1263#define QH_FINISHED_UNLINKING(qh) \
1264 (qh->state == QH_STATE_UNLINKING && \
1265 uhci->frame_number + uhci->is_stopped != qh->unlink_frame)
1266
1267static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh,
1268 struct pt_regs *regs)
1269{
1270 struct urb_priv *urbp;
1271 struct urb *urb;
1272 int status;
1273
1274 while (!list_empty(&qh->queue)) {
1275 urbp = list_entry(qh->queue.next, struct urb_priv, node);
1276 urb = urbp->urb;
1277
Alan Stern4de7d2c2006-05-05 16:26:58 -04001278 switch (qh->type) {
1279 case USB_ENDPOINT_XFER_CONTROL:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001280 status = uhci_result_control(uhci, urb);
1281 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001282 case USB_ENDPOINT_XFER_ISOC:
Alan Stern0ed8fee2005-12-17 18:02:38 -05001283 status = uhci_result_isochronous(uhci, urb);
1284 break;
Alan Stern4de7d2c2006-05-05 16:26:58 -04001285 default: /* USB_ENDPOINT_XFER_BULK or _INT */
Alan Stern0ed8fee2005-12-17 18:02:38 -05001286 status = uhci_result_common(uhci, urb);
1287 break;
1288 }
1289 if (status == -EINPROGRESS)
1290 break;
1291
1292 spin_lock(&urb->lock);
1293 if (urb->status == -EINPROGRESS) /* Not dequeued */
1294 urb->status = status;
1295 else
1296 status = -ECONNRESET;
1297 spin_unlock(&urb->lock);
1298
1299 /* Dequeued but completed URBs can't be given back unless
1300 * the QH is stopped or has finished unlinking. */
1301 if (status == -ECONNRESET &&
1302 !(qh->is_stopped || QH_FINISHED_UNLINKING(qh)))
1303 return;
1304
1305 uhci_giveback_urb(uhci, qh, urb, regs);
1306 if (qh->is_stopped)
1307 break;
1308 }
1309
1310 /* If the QH is neither stopped nor finished unlinking (normal case),
1311 * our work here is done. */
1312 restart:
1313 if (!(qh->is_stopped || QH_FINISHED_UNLINKING(qh)))
1314 return;
1315
1316 /* Otherwise give back each of the dequeued URBs */
1317 list_for_each_entry(urbp, &qh->queue, node) {
1318 urb = urbp->urb;
1319 if (urb->status != -EINPROGRESS) {
1320 uhci_save_toggle(qh, urb);
1321 uhci_giveback_urb(uhci, qh, urb, regs);
1322 goto restart;
1323 }
1324 }
1325 qh->is_stopped = 0;
1326
1327 /* There are no more dequeued URBs. If there are still URBs on the
1328 * queue, the QH can now be re-activated. */
1329 if (!list_empty(&qh->queue)) {
1330 if (qh->needs_fixup)
1331 uhci_fixup_toggles(qh, 0);
1332 uhci_activate_qh(uhci, qh);
1333 }
1334
1335 /* The queue is empty. The QH can become idle if it is fully
1336 * unlinked. */
1337 else if (QH_FINISHED_UNLINKING(qh))
1338 uhci_make_qh_idle(uhci, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339}
1340
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341static void uhci_free_pending_tds(struct uhci_hcd *uhci)
1342{
1343 struct uhci_td *td, *tmp;
1344
1345 list_for_each_entry_safe(td, tmp, &uhci->td_remove_list, remove_list) {
1346 list_del_init(&td->remove_list);
1347
1348 uhci_free_td(uhci, td);
1349 }
1350}
1351
Alan Stern0ed8fee2005-12-17 18:02:38 -05001352/*
1353 * Process events in the schedule, but only in one thread at a time
1354 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs)
1356{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001357 int i;
1358 struct uhci_qh *qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
1360 /* Don't allow re-entrant calls */
1361 if (uhci->scan_in_progress) {
1362 uhci->need_rescan = 1;
1363 return;
1364 }
1365 uhci->scan_in_progress = 1;
1366 rescan:
1367 uhci->need_rescan = 0;
1368
Alan Stern6c1b4452005-04-21 16:04:58 -04001369 uhci_clear_next_interrupt(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 uhci_get_current_frame_number(uhci);
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age)
1373 uhci_free_pending_tds(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374
Alan Stern0ed8fee2005-12-17 18:02:38 -05001375 /* Go through all the QH queues and process the URBs in each one */
1376 for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) {
1377 uhci->next_qh = list_entry(uhci->skelqh[i]->node.next,
1378 struct uhci_qh, node);
1379 while ((qh = uhci->next_qh) != uhci->skelqh[i]) {
1380 uhci->next_qh = list_entry(qh->node.next,
1381 struct uhci_qh, node);
1382 uhci_scan_qh(uhci, qh, regs);
1383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
1386 if (uhci->need_rescan)
1387 goto rescan;
1388 uhci->scan_in_progress = 0;
1389
Alan Stern0ed8fee2005-12-17 18:02:38 -05001390 /* If the controller is stopped, we can finish these off right now */
1391 if (uhci->is_stopped)
1392 uhci_free_pending_tds(uhci);
Alan Sterndccf4a42005-12-17 17:58:46 -05001393
1394 if (list_empty(&uhci->td_remove_list) &&
1395 list_empty(&uhci->skel_unlink_qh->node))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 uhci_clear_next_interrupt(uhci);
1397 else
1398 uhci_set_next_interrupt(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399}
Alan Sternf5946f82005-04-09 17:26:00 -04001400
1401static void check_fsbr(struct uhci_hcd *uhci)
1402{
Alan Stern0ed8fee2005-12-17 18:02:38 -05001403 /* For now, don't scan URBs for FSBR timeouts.
1404 * Add it back in later... */
Alan Sternf5946f82005-04-09 17:26:00 -04001405
1406 /* Really disable FSBR */
1407 if (!uhci->fsbr && uhci->fsbrtimeout && time_after_eq(jiffies, uhci->fsbrtimeout)) {
1408 uhci->fsbrtimeout = 0;
1409 uhci->skel_term_qh->link = UHCI_PTR_TERM;
1410 }
1411}