]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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) | |
17230acd | 16 | * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu |
1da177e4 LT |
17 | */ |
18 | ||
1da177e4 LT |
19 | |
20 | /* | |
21 | * Technically, updating td->status here is a race, but it's not really a | |
22 | * problem. The worst that can happen is that we set the IOC bit again | |
23 | * generating a spurious interrupt. We could fix this by creating another | |
24 | * QH and leaving the IOC bit always set, but then we would have to play | |
25 | * games with the FSBR code to make sure we get the correct order in all | |
26 | * the cases. I don't think it's worth the effort | |
27 | */ | |
dccf4a48 | 28 | static void uhci_set_next_interrupt(struct uhci_hcd *uhci) |
1da177e4 | 29 | { |
6c1b445c | 30 | if (uhci->is_stopped) |
1f09df8b | 31 | mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies); |
51e2f62f | 32 | uhci->term_td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
1da177e4 LT |
33 | } |
34 | ||
35 | static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci) | |
36 | { | |
51e2f62f | 37 | uhci->term_td->status &= ~cpu_to_hc32(uhci, TD_CTRL_IOC); |
1da177e4 LT |
38 | } |
39 | ||
84afddd7 AS |
40 | |
41 | /* | |
42 | * Full-Speed Bandwidth Reclamation (FSBR). | |
43 | * We turn on FSBR whenever a queue that wants it is advancing, | |
44 | * and leave it on for a short time thereafter. | |
45 | */ | |
46 | static void uhci_fsbr_on(struct uhci_hcd *uhci) | |
47 | { | |
e009f1b2 | 48 | struct uhci_qh *lqh; |
17230acd | 49 | |
e009f1b2 AS |
50 | /* The terminating skeleton QH always points back to the first |
51 | * FSBR QH. Make the last async QH point to the terminating | |
52 | * skeleton QH. */ | |
84afddd7 | 53 | uhci->fsbr_is_on = 1; |
17230acd AS |
54 | lqh = list_entry(uhci->skel_async_qh->node.prev, |
55 | struct uhci_qh, node); | |
51e2f62f | 56 | lqh->link = LINK_TO_QH(uhci, uhci->skel_term_qh); |
84afddd7 AS |
57 | } |
58 | ||
59 | static void uhci_fsbr_off(struct uhci_hcd *uhci) | |
60 | { | |
17230acd AS |
61 | struct uhci_qh *lqh; |
62 | ||
e009f1b2 AS |
63 | /* Remove the link from the last async QH to the terminating |
64 | * skeleton QH. */ | |
84afddd7 | 65 | uhci->fsbr_is_on = 0; |
17230acd AS |
66 | lqh = list_entry(uhci->skel_async_qh->node.prev, |
67 | struct uhci_qh, node); | |
51e2f62f | 68 | lqh->link = UHCI_PTR_TERM(uhci); |
84afddd7 AS |
69 | } |
70 | ||
71 | static void uhci_add_fsbr(struct uhci_hcd *uhci, struct urb *urb) | |
72 | { | |
73 | struct urb_priv *urbp = urb->hcpriv; | |
74 | ||
75 | if (!(urb->transfer_flags & URB_NO_FSBR)) | |
76 | urbp->fsbr = 1; | |
77 | } | |
78 | ||
c5e3b741 | 79 | static void uhci_urbp_wants_fsbr(struct uhci_hcd *uhci, struct urb_priv *urbp) |
84afddd7 | 80 | { |
84afddd7 | 81 | if (urbp->fsbr) { |
c5e3b741 | 82 | uhci->fsbr_is_wanted = 1; |
84afddd7 AS |
83 | if (!uhci->fsbr_is_on) |
84 | uhci_fsbr_on(uhci); | |
c5e3b741 AS |
85 | else if (uhci->fsbr_expiring) { |
86 | uhci->fsbr_expiring = 0; | |
87 | del_timer(&uhci->fsbr_timer); | |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | static void uhci_fsbr_timeout(unsigned long _uhci) | |
93 | { | |
94 | struct uhci_hcd *uhci = (struct uhci_hcd *) _uhci; | |
95 | unsigned long flags; | |
96 | ||
97 | spin_lock_irqsave(&uhci->lock, flags); | |
98 | if (uhci->fsbr_expiring) { | |
99 | uhci->fsbr_expiring = 0; | |
100 | uhci_fsbr_off(uhci); | |
84afddd7 | 101 | } |
c5e3b741 | 102 | spin_unlock_irqrestore(&uhci->lock, flags); |
84afddd7 AS |
103 | } |
104 | ||
105 | ||
2532178a | 106 | static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci) |
1da177e4 LT |
107 | { |
108 | dma_addr_t dma_handle; | |
109 | struct uhci_td *td; | |
110 | ||
111 | td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle); | |
112 | if (!td) | |
113 | return NULL; | |
114 | ||
115 | td->dma_handle = dma_handle; | |
1da177e4 | 116 | td->frame = -1; |
1da177e4 LT |
117 | |
118 | INIT_LIST_HEAD(&td->list); | |
1da177e4 LT |
119 | INIT_LIST_HEAD(&td->fl_list); |
120 | ||
1da177e4 LT |
121 | return td; |
122 | } | |
123 | ||
dccf4a48 AS |
124 | static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td) |
125 | { | |
5172046d AV |
126 | if (!list_empty(&td->list)) |
127 | dev_WARN(uhci_dev(uhci), "td %p still in list!\n", td); | |
128 | if (!list_empty(&td->fl_list)) | |
129 | dev_WARN(uhci_dev(uhci), "td %p still in fl_list!\n", td); | |
dccf4a48 AS |
130 | |
131 | dma_pool_free(uhci->td_pool, td, td->dma_handle); | |
132 | } | |
133 | ||
51e2f62f JA |
134 | static inline void uhci_fill_td(struct uhci_hcd *uhci, struct uhci_td *td, |
135 | u32 status, u32 token, u32 buffer) | |
1da177e4 | 136 | { |
51e2f62f JA |
137 | td->status = cpu_to_hc32(uhci, status); |
138 | td->token = cpu_to_hc32(uhci, token); | |
139 | td->buffer = cpu_to_hc32(uhci, buffer); | |
1da177e4 LT |
140 | } |
141 | ||
04538a25 AS |
142 | static void uhci_add_td_to_urbp(struct uhci_td *td, struct urb_priv *urbp) |
143 | { | |
144 | list_add_tail(&td->list, &urbp->td_list); | |
145 | } | |
146 | ||
147 | static void uhci_remove_td_from_urbp(struct uhci_td *td) | |
148 | { | |
149 | list_del_init(&td->list); | |
150 | } | |
151 | ||
1da177e4 | 152 | /* |
687f5f34 | 153 | * We insert Isochronous URBs directly into the frame list at the beginning |
1da177e4 | 154 | */ |
dccf4a48 AS |
155 | static inline void uhci_insert_td_in_frame_list(struct uhci_hcd *uhci, |
156 | struct uhci_td *td, unsigned framenum) | |
1da177e4 LT |
157 | { |
158 | framenum &= (UHCI_NUMFRAMES - 1); | |
159 | ||
160 | td->frame = framenum; | |
161 | ||
162 | /* Is there a TD already mapped there? */ | |
a1d59ce8 | 163 | if (uhci->frame_cpu[framenum]) { |
1da177e4 LT |
164 | struct uhci_td *ftd, *ltd; |
165 | ||
a1d59ce8 | 166 | ftd = uhci->frame_cpu[framenum]; |
1da177e4 LT |
167 | ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list); |
168 | ||
169 | list_add_tail(&td->fl_list, &ftd->fl_list); | |
170 | ||
171 | td->link = ltd->link; | |
172 | wmb(); | |
51e2f62f | 173 | ltd->link = LINK_TO_TD(uhci, td); |
1da177e4 | 174 | } else { |
a1d59ce8 | 175 | td->link = uhci->frame[framenum]; |
1da177e4 | 176 | wmb(); |
51e2f62f | 177 | uhci->frame[framenum] = LINK_TO_TD(uhci, td); |
a1d59ce8 | 178 | uhci->frame_cpu[framenum] = td; |
1da177e4 LT |
179 | } |
180 | } | |
181 | ||
dccf4a48 | 182 | static inline void uhci_remove_td_from_frame_list(struct uhci_hcd *uhci, |
b81d3436 | 183 | struct uhci_td *td) |
1da177e4 LT |
184 | { |
185 | /* If it's not inserted, don't remove it */ | |
b81d3436 AS |
186 | if (td->frame == -1) { |
187 | WARN_ON(!list_empty(&td->fl_list)); | |
1da177e4 | 188 | return; |
b81d3436 | 189 | } |
1da177e4 | 190 | |
b81d3436 | 191 | if (uhci->frame_cpu[td->frame] == td) { |
1da177e4 | 192 | if (list_empty(&td->fl_list)) { |
a1d59ce8 AS |
193 | uhci->frame[td->frame] = td->link; |
194 | uhci->frame_cpu[td->frame] = NULL; | |
1da177e4 LT |
195 | } else { |
196 | struct uhci_td *ntd; | |
197 | ||
16325f18 TO |
198 | ntd = list_entry(td->fl_list.next, |
199 | struct uhci_td, | |
200 | fl_list); | |
51e2f62f | 201 | uhci->frame[td->frame] = LINK_TO_TD(uhci, ntd); |
a1d59ce8 | 202 | uhci->frame_cpu[td->frame] = ntd; |
1da177e4 LT |
203 | } |
204 | } else { | |
205 | struct uhci_td *ptd; | |
206 | ||
207 | ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list); | |
208 | ptd->link = td->link; | |
209 | } | |
210 | ||
1da177e4 LT |
211 | list_del_init(&td->fl_list); |
212 | td->frame = -1; | |
213 | } | |
214 | ||
c8155cc5 AS |
215 | static inline void uhci_remove_tds_from_frame(struct uhci_hcd *uhci, |
216 | unsigned int framenum) | |
217 | { | |
218 | struct uhci_td *ftd, *ltd; | |
219 | ||
220 | framenum &= (UHCI_NUMFRAMES - 1); | |
221 | ||
222 | ftd = uhci->frame_cpu[framenum]; | |
223 | if (ftd) { | |
224 | ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list); | |
225 | uhci->frame[framenum] = ltd->link; | |
226 | uhci->frame_cpu[framenum] = NULL; | |
227 | ||
228 | while (!list_empty(&ftd->fl_list)) | |
229 | list_del_init(ftd->fl_list.prev); | |
230 | } | |
231 | } | |
232 | ||
dccf4a48 AS |
233 | /* |
234 | * Remove all the TDs for an Isochronous URB from the frame list | |
235 | */ | |
236 | static void uhci_unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb) | |
b81d3436 AS |
237 | { |
238 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; | |
239 | struct uhci_td *td; | |
240 | ||
241 | list_for_each_entry(td, &urbp->td_list, list) | |
dccf4a48 | 242 | uhci_remove_td_from_frame_list(uhci, td); |
b81d3436 AS |
243 | } |
244 | ||
dccf4a48 AS |
245 | static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, |
246 | struct usb_device *udev, struct usb_host_endpoint *hep) | |
1da177e4 LT |
247 | { |
248 | dma_addr_t dma_handle; | |
249 | struct uhci_qh *qh; | |
250 | ||
84c1eeb0 | 251 | qh = dma_pool_zalloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle); |
1da177e4 LT |
252 | if (!qh) |
253 | return NULL; | |
254 | ||
255 | qh->dma_handle = dma_handle; | |
256 | ||
51e2f62f JA |
257 | qh->element = UHCI_PTR_TERM(uhci); |
258 | qh->link = UHCI_PTR_TERM(uhci); | |
1da177e4 | 259 | |
dccf4a48 AS |
260 | INIT_LIST_HEAD(&qh->queue); |
261 | INIT_LIST_HEAD(&qh->node); | |
1da177e4 | 262 | |
dccf4a48 | 263 | if (udev) { /* Normal QH */ |
1eba67a6 | 264 | qh->type = usb_endpoint_type(&hep->desc); |
85a975d0 AS |
265 | if (qh->type != USB_ENDPOINT_XFER_ISOC) { |
266 | qh->dummy_td = uhci_alloc_td(uhci); | |
267 | if (!qh->dummy_td) { | |
268 | dma_pool_free(uhci->qh_pool, qh, dma_handle); | |
269 | return NULL; | |
270 | } | |
af0bb599 | 271 | } |
dccf4a48 AS |
272 | qh->state = QH_STATE_IDLE; |
273 | qh->hep = hep; | |
274 | qh->udev = udev; | |
275 | hep->hcpriv = qh; | |
1da177e4 | 276 | |
3ca2a321 AS |
277 | if (qh->type == USB_ENDPOINT_XFER_INT || |
278 | qh->type == USB_ENDPOINT_XFER_ISOC) | |
279 | qh->load = usb_calc_bus_time(udev->speed, | |
280 | usb_endpoint_dir_in(&hep->desc), | |
281 | qh->type == USB_ENDPOINT_XFER_ISOC, | |
29cc8897 | 282 | usb_endpoint_maxp(&hep->desc)) |
3ca2a321 AS |
283 | / 1000 + 1; |
284 | ||
dccf4a48 AS |
285 | } else { /* Skeleton QH */ |
286 | qh->state = QH_STATE_ACTIVE; | |
4de7d2c2 | 287 | qh->type = -1; |
dccf4a48 | 288 | } |
1da177e4 LT |
289 | return qh; |
290 | } | |
291 | ||
292 | static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
293 | { | |
dccf4a48 | 294 | WARN_ON(qh->state != QH_STATE_IDLE && qh->udev); |
5172046d AV |
295 | if (!list_empty(&qh->queue)) |
296 | dev_WARN(uhci_dev(uhci), "qh %p list not empty!\n", qh); | |
1da177e4 | 297 | |
dccf4a48 AS |
298 | list_del(&qh->node); |
299 | if (qh->udev) { | |
300 | qh->hep->hcpriv = NULL; | |
85a975d0 AS |
301 | if (qh->dummy_td) |
302 | uhci_free_td(uhci, qh->dummy_td); | |
dccf4a48 | 303 | } |
1da177e4 LT |
304 | dma_pool_free(uhci->qh_pool, qh, qh->dma_handle); |
305 | } | |
306 | ||
0ed8fee1 | 307 | /* |
a0b458b6 AS |
308 | * When a queue is stopped and a dequeued URB is given back, adjust |
309 | * the previous TD link (if the URB isn't first on the queue) or | |
310 | * save its toggle value (if it is first and is currently executing). | |
10b8e47d AS |
311 | * |
312 | * Returns 0 if the URB should not yet be given back, 1 otherwise. | |
0ed8fee1 | 313 | */ |
10b8e47d | 314 | static int uhci_cleanup_queue(struct uhci_hcd *uhci, struct uhci_qh *qh, |
a0b458b6 | 315 | struct urb *urb) |
0ed8fee1 | 316 | { |
a0b458b6 | 317 | struct urb_priv *urbp = urb->hcpriv; |
0ed8fee1 | 318 | struct uhci_td *td; |
10b8e47d | 319 | int ret = 1; |
0ed8fee1 | 320 | |
a0b458b6 | 321 | /* Isochronous pipes don't use toggles and their TD link pointers |
10b8e47d AS |
322 | * get adjusted during uhci_urb_dequeue(). But since their queues |
323 | * cannot truly be stopped, we have to watch out for dequeues | |
324 | * occurring after the nominal unlink frame. */ | |
325 | if (qh->type == USB_ENDPOINT_XFER_ISOC) { | |
326 | ret = (uhci->frame_number + uhci->is_stopped != | |
327 | qh->unlink_frame); | |
c5e3b741 | 328 | goto done; |
10b8e47d | 329 | } |
a0b458b6 AS |
330 | |
331 | /* If the URB isn't first on its queue, adjust the link pointer | |
332 | * of the last TD in the previous URB. The toggle doesn't need | |
333 | * to be saved since this URB can't be executing yet. */ | |
334 | if (qh->queue.next != &urbp->node) { | |
335 | struct urb_priv *purbp; | |
336 | struct uhci_td *ptd; | |
337 | ||
338 | purbp = list_entry(urbp->node.prev, struct urb_priv, node); | |
339 | WARN_ON(list_empty(&purbp->td_list)); | |
340 | ptd = list_entry(purbp->td_list.prev, struct uhci_td, | |
341 | list); | |
342 | td = list_entry(urbp->td_list.prev, struct uhci_td, | |
343 | list); | |
344 | ptd->link = td->link; | |
c5e3b741 | 345 | goto done; |
a0b458b6 AS |
346 | } |
347 | ||
0ed8fee1 AS |
348 | /* If the QH element pointer is UHCI_PTR_TERM then then currently |
349 | * executing URB has already been unlinked, so this one isn't it. */ | |
51e2f62f | 350 | if (qh_element(qh) == UHCI_PTR_TERM(uhci)) |
c5e3b741 | 351 | goto done; |
51e2f62f | 352 | qh->element = UHCI_PTR_TERM(uhci); |
0ed8fee1 | 353 | |
85a975d0 | 354 | /* Control pipes don't have to worry about toggles */ |
a0b458b6 | 355 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) |
c5e3b741 | 356 | goto done; |
0ed8fee1 | 357 | |
a0b458b6 | 358 | /* Save the next toggle value */ |
59e29ed9 AS |
359 | WARN_ON(list_empty(&urbp->td_list)); |
360 | td = list_entry(urbp->td_list.next, struct uhci_td, list); | |
361 | qh->needs_fixup = 1; | |
51e2f62f | 362 | qh->initial_toggle = uhci_toggle(td_token(uhci, td)); |
c5e3b741 AS |
363 | |
364 | done: | |
10b8e47d | 365 | return ret; |
0ed8fee1 AS |
366 | } |
367 | ||
368 | /* | |
369 | * Fix up the data toggles for URBs in a queue, when one of them | |
370 | * terminates early (short transfer, error, or dequeued). | |
371 | */ | |
51e2f62f JA |
372 | static void uhci_fixup_toggles(struct uhci_hcd *uhci, struct uhci_qh *qh, |
373 | int skip_first) | |
0ed8fee1 AS |
374 | { |
375 | struct urb_priv *urbp = NULL; | |
376 | struct uhci_td *td; | |
377 | unsigned int toggle = qh->initial_toggle; | |
378 | unsigned int pipe; | |
379 | ||
380 | /* Fixups for a short transfer start with the second URB in the | |
381 | * queue (the short URB is the first). */ | |
382 | if (skip_first) | |
383 | urbp = list_entry(qh->queue.next, struct urb_priv, node); | |
384 | ||
385 | /* When starting with the first URB, if the QH element pointer is | |
386 | * still valid then we know the URB's toggles are okay. */ | |
51e2f62f | 387 | else if (qh_element(qh) != UHCI_PTR_TERM(uhci)) |
0ed8fee1 AS |
388 | toggle = 2; |
389 | ||
390 | /* Fix up the toggle for the URBs in the queue. Normally this | |
391 | * loop won't run more than once: When an error or short transfer | |
392 | * occurs, the queue usually gets emptied. */ | |
1393adb2 | 393 | urbp = list_prepare_entry(urbp, &qh->queue, node); |
0ed8fee1 AS |
394 | list_for_each_entry_continue(urbp, &qh->queue, node) { |
395 | ||
396 | /* If the first TD has the right toggle value, we don't | |
397 | * need to change any toggles in this URB */ | |
398 | td = list_entry(urbp->td_list.next, struct uhci_td, list); | |
51e2f62f | 399 | if (toggle > 1 || uhci_toggle(td_token(uhci, td)) == toggle) { |
db59b464 | 400 | td = list_entry(urbp->td_list.prev, struct uhci_td, |
0ed8fee1 | 401 | list); |
51e2f62f | 402 | toggle = uhci_toggle(td_token(uhci, td)) ^ 1; |
0ed8fee1 AS |
403 | |
404 | /* Otherwise all the toggles in the URB have to be switched */ | |
405 | } else { | |
406 | list_for_each_entry(td, &urbp->td_list, list) { | |
51e2f62f | 407 | td->token ^= cpu_to_hc32(uhci, |
0ed8fee1 AS |
408 | TD_TOKEN_TOGGLE); |
409 | toggle ^= 1; | |
410 | } | |
411 | } | |
412 | } | |
413 | ||
414 | wmb(); | |
415 | pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe; | |
416 | usb_settoggle(qh->udev, usb_pipeendpoint(pipe), | |
417 | usb_pipeout(pipe), toggle); | |
418 | qh->needs_fixup = 0; | |
419 | } | |
420 | ||
1da177e4 | 421 | /* |
17230acd | 422 | * Link an Isochronous QH into its skeleton's list |
1da177e4 | 423 | */ |
17230acd AS |
424 | static inline void link_iso(struct uhci_hcd *uhci, struct uhci_qh *qh) |
425 | { | |
426 | list_add_tail(&qh->node, &uhci->skel_iso_qh->node); | |
427 | ||
428 | /* Isochronous QHs aren't linked by the hardware */ | |
429 | } | |
430 | ||
431 | /* | |
432 | * Link a high-period interrupt QH into the schedule at the end of its | |
433 | * skeleton's list | |
434 | */ | |
435 | static void link_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
1da177e4 | 436 | { |
dccf4a48 | 437 | struct uhci_qh *pqh; |
1da177e4 | 438 | |
17230acd AS |
439 | list_add_tail(&qh->node, &uhci->skelqh[qh->skel]->node); |
440 | ||
441 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); | |
442 | qh->link = pqh->link; | |
443 | wmb(); | |
51e2f62f | 444 | pqh->link = LINK_TO_QH(uhci, qh); |
17230acd AS |
445 | } |
446 | ||
447 | /* | |
448 | * Link a period-1 interrupt or async QH into the schedule at the | |
449 | * correct spot in the async skeleton's list, and update the FSBR link | |
450 | */ | |
451 | static void link_async(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
452 | { | |
e009f1b2 | 453 | struct uhci_qh *pqh; |
51e2f62f | 454 | __hc32 link_to_new_qh; |
17230acd AS |
455 | |
456 | /* Find the predecessor QH for our new one and insert it in the list. | |
457 | * The list of QHs is expected to be short, so linear search won't | |
458 | * take too long. */ | |
459 | list_for_each_entry_reverse(pqh, &uhci->skel_async_qh->node, node) { | |
460 | if (pqh->skel <= qh->skel) | |
461 | break; | |
462 | } | |
463 | list_add(&qh->node, &pqh->node); | |
17230acd AS |
464 | |
465 | /* Link it into the schedule */ | |
e009f1b2 | 466 | qh->link = pqh->link; |
17230acd | 467 | wmb(); |
51e2f62f | 468 | link_to_new_qh = LINK_TO_QH(uhci, qh); |
e009f1b2 AS |
469 | pqh->link = link_to_new_qh; |
470 | ||
471 | /* If this is now the first FSBR QH, link the terminating skeleton | |
472 | * QH to it. */ | |
473 | if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR) | |
474 | uhci->skel_term_qh->link = link_to_new_qh; | |
17230acd AS |
475 | } |
476 | ||
477 | /* | |
478 | * Put a QH on the schedule in both hardware and software | |
479 | */ | |
480 | static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
481 | { | |
dccf4a48 | 482 | WARN_ON(list_empty(&qh->queue)); |
1da177e4 | 483 | |
dccf4a48 AS |
484 | /* Set the element pointer if it isn't set already. |
485 | * This isn't needed for Isochronous queues, but it doesn't hurt. */ | |
51e2f62f | 486 | if (qh_element(qh) == UHCI_PTR_TERM(uhci)) { |
dccf4a48 AS |
487 | struct urb_priv *urbp = list_entry(qh->queue.next, |
488 | struct urb_priv, node); | |
489 | struct uhci_td *td = list_entry(urbp->td_list.next, | |
490 | struct uhci_td, list); | |
1da177e4 | 491 | |
51e2f62f | 492 | qh->element = LINK_TO_TD(uhci, td); |
1da177e4 LT |
493 | } |
494 | ||
84afddd7 AS |
495 | /* Treat the queue as if it has just advanced */ |
496 | qh->wait_expired = 0; | |
497 | qh->advance_jiffies = jiffies; | |
498 | ||
dccf4a48 AS |
499 | if (qh->state == QH_STATE_ACTIVE) |
500 | return; | |
501 | qh->state = QH_STATE_ACTIVE; | |
502 | ||
17230acd | 503 | /* Move the QH from its old list to the correct spot in the appropriate |
dccf4a48 | 504 | * skeleton's list */ |
0ed8fee1 AS |
505 | if (qh == uhci->next_qh) |
506 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, | |
507 | node); | |
17230acd AS |
508 | list_del(&qh->node); |
509 | ||
510 | if (qh->skel == SKEL_ISO) | |
511 | link_iso(uhci, qh); | |
512 | else if (qh->skel < SKEL_ASYNC) | |
513 | link_interrupt(uhci, qh); | |
514 | else | |
515 | link_async(uhci, qh); | |
516 | } | |
517 | ||
518 | /* | |
519 | * Unlink a high-period interrupt QH from the schedule | |
520 | */ | |
521 | static void unlink_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
522 | { | |
523 | struct uhci_qh *pqh; | |
dccf4a48 | 524 | |
dccf4a48 | 525 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); |
17230acd AS |
526 | pqh->link = qh->link; |
527 | mb(); | |
528 | } | |
529 | ||
530 | /* | |
531 | * Unlink a period-1 interrupt or async QH from the schedule | |
532 | */ | |
533 | static void unlink_async(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
534 | { | |
e009f1b2 | 535 | struct uhci_qh *pqh; |
51e2f62f | 536 | __hc32 link_to_next_qh = qh->link; |
17230acd AS |
537 | |
538 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); | |
17230acd | 539 | pqh->link = link_to_next_qh; |
e009f1b2 AS |
540 | |
541 | /* If this was the old first FSBR QH, link the terminating skeleton | |
542 | * QH to the next (new first FSBR) QH. */ | |
543 | if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR) | |
544 | uhci->skel_term_qh->link = link_to_next_qh; | |
17230acd | 545 | mb(); |
1da177e4 LT |
546 | } |
547 | ||
548 | /* | |
dccf4a48 | 549 | * Take a QH off the hardware schedule |
1da177e4 | 550 | */ |
dccf4a48 | 551 | static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) |
1da177e4 | 552 | { |
dccf4a48 | 553 | if (qh->state == QH_STATE_UNLINKING) |
1da177e4 | 554 | return; |
dccf4a48 AS |
555 | WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev); |
556 | qh->state = QH_STATE_UNLINKING; | |
1da177e4 | 557 | |
dccf4a48 | 558 | /* Unlink the QH from the schedule and record when we did it */ |
17230acd AS |
559 | if (qh->skel == SKEL_ISO) |
560 | ; | |
561 | else if (qh->skel < SKEL_ASYNC) | |
562 | unlink_interrupt(uhci, qh); | |
563 | else | |
564 | unlink_async(uhci, qh); | |
1da177e4 LT |
565 | |
566 | uhci_get_current_frame_number(uhci); | |
dccf4a48 | 567 | qh->unlink_frame = uhci->frame_number; |
1da177e4 | 568 | |
dccf4a48 | 569 | /* Force an interrupt so we know when the QH is fully unlinked */ |
ba297edd | 570 | if (list_empty(&uhci->skel_unlink_qh->node) || uhci->is_stopped) |
1da177e4 LT |
571 | uhci_set_next_interrupt(uhci); |
572 | ||
dccf4a48 | 573 | /* Move the QH from its old list to the end of the unlinking list */ |
0ed8fee1 AS |
574 | if (qh == uhci->next_qh) |
575 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, | |
576 | node); | |
dccf4a48 | 577 | list_move_tail(&qh->node, &uhci->skel_unlink_qh->node); |
1da177e4 LT |
578 | } |
579 | ||
dccf4a48 AS |
580 | /* |
581 | * When we and the controller are through with a QH, it becomes IDLE. | |
582 | * This happens when a QH has been off the schedule (on the unlinking | |
583 | * list) for more than one frame, or when an error occurs while adding | |
584 | * the first URB onto a new QH. | |
585 | */ | |
586 | static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
1da177e4 | 587 | { |
dccf4a48 | 588 | WARN_ON(qh->state == QH_STATE_ACTIVE); |
1da177e4 | 589 | |
0ed8fee1 AS |
590 | if (qh == uhci->next_qh) |
591 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, | |
592 | node); | |
dccf4a48 AS |
593 | list_move(&qh->node, &uhci->idle_qh_list); |
594 | qh->state = QH_STATE_IDLE; | |
1da177e4 | 595 | |
59e29ed9 AS |
596 | /* Now that the QH is idle, its post_td isn't being used */ |
597 | if (qh->post_td) { | |
598 | uhci_free_td(uhci, qh->post_td); | |
599 | qh->post_td = NULL; | |
600 | } | |
601 | ||
dccf4a48 AS |
602 | /* If anyone is waiting for a QH to become idle, wake them up */ |
603 | if (uhci->num_waiting) | |
604 | wake_up_all(&uhci->waitqh); | |
1da177e4 LT |
605 | } |
606 | ||
3ca2a321 AS |
607 | /* |
608 | * Find the highest existing bandwidth load for a given phase and period. | |
609 | */ | |
610 | static int uhci_highest_load(struct uhci_hcd *uhci, int phase, int period) | |
611 | { | |
612 | int highest_load = uhci->load[phase]; | |
613 | ||
614 | for (phase += period; phase < MAX_PHASE; phase += period) | |
615 | highest_load = max_t(int, highest_load, uhci->load[phase]); | |
616 | return highest_load; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Set qh->phase to the optimal phase for a periodic transfer and | |
621 | * check whether the bandwidth requirement is acceptable. | |
622 | */ | |
623 | static int uhci_check_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
624 | { | |
625 | int minimax_load; | |
626 | ||
627 | /* Find the optimal phase (unless it is already set) and get | |
628 | * its load value. */ | |
629 | if (qh->phase >= 0) | |
630 | minimax_load = uhci_highest_load(uhci, qh->phase, qh->period); | |
631 | else { | |
632 | int phase, load; | |
633 | int max_phase = min_t(int, MAX_PHASE, qh->period); | |
634 | ||
635 | qh->phase = 0; | |
636 | minimax_load = uhci_highest_load(uhci, qh->phase, qh->period); | |
637 | for (phase = 1; phase < max_phase; ++phase) { | |
638 | load = uhci_highest_load(uhci, phase, qh->period); | |
639 | if (load < minimax_load) { | |
640 | minimax_load = load; | |
641 | qh->phase = phase; | |
642 | } | |
643 | } | |
644 | } | |
645 | ||
646 | /* Maximum allowable periodic bandwidth is 90%, or 900 us per frame */ | |
647 | if (minimax_load + qh->load > 900) { | |
648 | dev_dbg(uhci_dev(uhci), "bandwidth allocation failed: " | |
649 | "period %d, phase %d, %d + %d us\n", | |
650 | qh->period, qh->phase, minimax_load, qh->load); | |
651 | return -ENOSPC; | |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* | |
657 | * Reserve a periodic QH's bandwidth in the schedule | |
658 | */ | |
659 | static void uhci_reserve_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
660 | { | |
661 | int i; | |
662 | int load = qh->load; | |
663 | char *p = "??"; | |
664 | ||
665 | for (i = qh->phase; i < MAX_PHASE; i += qh->period) { | |
666 | uhci->load[i] += load; | |
667 | uhci->total_load += load; | |
668 | } | |
669 | uhci_to_hcd(uhci)->self.bandwidth_allocated = | |
670 | uhci->total_load / MAX_PHASE; | |
671 | switch (qh->type) { | |
672 | case USB_ENDPOINT_XFER_INT: | |
673 | ++uhci_to_hcd(uhci)->self.bandwidth_int_reqs; | |
674 | p = "INT"; | |
675 | break; | |
676 | case USB_ENDPOINT_XFER_ISOC: | |
677 | ++uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs; | |
678 | p = "ISO"; | |
679 | break; | |
680 | } | |
681 | qh->bandwidth_reserved = 1; | |
682 | dev_dbg(uhci_dev(uhci), | |
683 | "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n", | |
684 | "reserve", qh->udev->devnum, | |
685 | qh->hep->desc.bEndpointAddress, p, | |
686 | qh->period, qh->phase, load); | |
687 | } | |
688 | ||
689 | /* | |
690 | * Release a periodic QH's bandwidth reservation | |
691 | */ | |
692 | static void uhci_release_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
693 | { | |
694 | int i; | |
695 | int load = qh->load; | |
696 | char *p = "??"; | |
697 | ||
698 | for (i = qh->phase; i < MAX_PHASE; i += qh->period) { | |
699 | uhci->load[i] -= load; | |
700 | uhci->total_load -= load; | |
701 | } | |
702 | uhci_to_hcd(uhci)->self.bandwidth_allocated = | |
703 | uhci->total_load / MAX_PHASE; | |
704 | switch (qh->type) { | |
705 | case USB_ENDPOINT_XFER_INT: | |
706 | --uhci_to_hcd(uhci)->self.bandwidth_int_reqs; | |
707 | p = "INT"; | |
708 | break; | |
709 | case USB_ENDPOINT_XFER_ISOC: | |
710 | --uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs; | |
711 | p = "ISO"; | |
712 | break; | |
713 | } | |
714 | qh->bandwidth_reserved = 0; | |
715 | dev_dbg(uhci_dev(uhci), | |
716 | "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n", | |
717 | "release", qh->udev->devnum, | |
718 | qh->hep->desc.bEndpointAddress, p, | |
719 | qh->period, qh->phase, load); | |
720 | } | |
721 | ||
dccf4a48 AS |
722 | static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, |
723 | struct urb *urb) | |
1da177e4 LT |
724 | { |
725 | struct urb_priv *urbp; | |
726 | ||
c3762229 | 727 | urbp = kmem_cache_zalloc(uhci_up_cachep, GFP_ATOMIC); |
1da177e4 LT |
728 | if (!urbp) |
729 | return NULL; | |
730 | ||
1da177e4 | 731 | urbp->urb = urb; |
dccf4a48 | 732 | urb->hcpriv = urbp; |
16325f18 | 733 | |
dccf4a48 | 734 | INIT_LIST_HEAD(&urbp->node); |
1da177e4 | 735 | INIT_LIST_HEAD(&urbp->td_list); |
1da177e4 | 736 | |
1da177e4 LT |
737 | return urbp; |
738 | } | |
739 | ||
dccf4a48 AS |
740 | static void uhci_free_urb_priv(struct uhci_hcd *uhci, |
741 | struct urb_priv *urbp) | |
1da177e4 LT |
742 | { |
743 | struct uhci_td *td, *tmp; | |
1da177e4 | 744 | |
5172046d AV |
745 | if (!list_empty(&urbp->node)) |
746 | dev_WARN(uhci_dev(uhci), "urb %p still on QH's list!\n", | |
dccf4a48 | 747 | urbp->urb); |
1da177e4 | 748 | |
1da177e4 | 749 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
04538a25 AS |
750 | uhci_remove_td_from_urbp(td); |
751 | uhci_free_td(uhci, td); | |
1da177e4 LT |
752 | } |
753 | ||
1da177e4 LT |
754 | kmem_cache_free(uhci_up_cachep, urbp); |
755 | } | |
756 | ||
1da177e4 LT |
757 | /* |
758 | * Map status to standard result codes | |
759 | * | |
51e2f62f JA |
760 | * <status> is (td_status(uhci, td) & 0xF60000), a.k.a. |
761 | * uhci_status_bits(td_status(uhci, td)). | |
1da177e4 LT |
762 | * Note: <status> does not include the TD_CTRL_NAK bit. |
763 | * <dir_out> is True for output TDs and False for input TDs. | |
764 | */ | |
765 | static int uhci_map_status(int status, int dir_out) | |
766 | { | |
767 | if (!status) | |
768 | return 0; | |
769 | if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */ | |
770 | return -EPROTO; | |
771 | if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */ | |
772 | if (dir_out) | |
773 | return -EPROTO; | |
774 | else | |
775 | return -EILSEQ; | |
776 | } | |
777 | if (status & TD_CTRL_BABBLE) /* Babble */ | |
778 | return -EOVERFLOW; | |
779 | if (status & TD_CTRL_DBUFERR) /* Buffer error */ | |
780 | return -ENOSR; | |
781 | if (status & TD_CTRL_STALLED) /* Stalled */ | |
782 | return -EPIPE; | |
1da177e4 LT |
783 | return 0; |
784 | } | |
785 | ||
786 | /* | |
787 | * Control transfers | |
788 | */ | |
dccf4a48 AS |
789 | static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, |
790 | struct uhci_qh *qh) | |
1da177e4 | 791 | { |
1da177e4 | 792 | struct uhci_td *td; |
1da177e4 | 793 | unsigned long destination, status; |
29cc8897 | 794 | int maxsze = usb_endpoint_maxp(&qh->hep->desc); |
1da177e4 LT |
795 | int len = urb->transfer_buffer_length; |
796 | dma_addr_t data = urb->transfer_dma; | |
51e2f62f | 797 | __hc32 *plink; |
04538a25 | 798 | struct urb_priv *urbp = urb->hcpriv; |
17230acd | 799 | int skel; |
1da177e4 LT |
800 | |
801 | /* The "pipe" thing contains the destination in bits 8--18 */ | |
802 | destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP; | |
803 | ||
af0bb599 AS |
804 | /* 3 errors, dummy TD remains inactive */ |
805 | status = uhci_maxerr(3); | |
1da177e4 LT |
806 | if (urb->dev->speed == USB_SPEED_LOW) |
807 | status |= TD_CTRL_LS; | |
808 | ||
809 | /* | |
810 | * Build the TD for the control request setup packet | |
811 | */ | |
af0bb599 | 812 | td = qh->dummy_td; |
04538a25 | 813 | uhci_add_td_to_urbp(td, urbp); |
51e2f62f | 814 | uhci_fill_td(uhci, td, status, destination | uhci_explen(8), |
dccf4a48 AS |
815 | urb->setup_dma); |
816 | plink = &td->link; | |
af0bb599 | 817 | status |= TD_CTRL_ACTIVE; |
1da177e4 LT |
818 | |
819 | /* | |
820 | * If direction is "send", change the packet ID from SETUP (0x2D) | |
821 | * to OUT (0xE1). Else change it from SETUP to IN (0x69) and | |
822 | * set Short Packet Detect (SPD) for all data packets. | |
e7e7c360 AS |
823 | * |
824 | * 0-length transfers always get treated as "send". | |
1da177e4 | 825 | */ |
e7e7c360 | 826 | if (usb_pipeout(urb->pipe) || len == 0) |
1da177e4 LT |
827 | destination ^= (USB_PID_SETUP ^ USB_PID_OUT); |
828 | else { | |
829 | destination ^= (USB_PID_SETUP ^ USB_PID_IN); | |
830 | status |= TD_CTRL_SPD; | |
831 | } | |
832 | ||
833 | /* | |
687f5f34 | 834 | * Build the DATA TDs |
1da177e4 LT |
835 | */ |
836 | while (len > 0) { | |
e7e7c360 AS |
837 | int pktsze = maxsze; |
838 | ||
839 | if (len <= pktsze) { /* The last data packet */ | |
840 | pktsze = len; | |
841 | status &= ~TD_CTRL_SPD; | |
842 | } | |
1da177e4 | 843 | |
2532178a | 844 | td = uhci_alloc_td(uhci); |
1da177e4 | 845 | if (!td) |
af0bb599 | 846 | goto nomem; |
51e2f62f | 847 | *plink = LINK_TO_TD(uhci, td); |
1da177e4 LT |
848 | |
849 | /* Alternate Data0/1 (start with Data1) */ | |
850 | destination ^= TD_TOKEN_TOGGLE; | |
16325f18 | 851 | |
04538a25 | 852 | uhci_add_td_to_urbp(td, urbp); |
51e2f62f JA |
853 | uhci_fill_td(uhci, td, status, |
854 | destination | uhci_explen(pktsze), data); | |
dccf4a48 | 855 | plink = &td->link; |
1da177e4 LT |
856 | |
857 | data += pktsze; | |
858 | len -= pktsze; | |
859 | } | |
860 | ||
861 | /* | |
16325f18 | 862 | * Build the final TD for control status |
1da177e4 | 863 | */ |
2532178a | 864 | td = uhci_alloc_td(uhci); |
1da177e4 | 865 | if (!td) |
af0bb599 | 866 | goto nomem; |
51e2f62f | 867 | *plink = LINK_TO_TD(uhci, td); |
1da177e4 | 868 | |
e7e7c360 AS |
869 | /* Change direction for the status transaction */ |
870 | destination ^= (USB_PID_IN ^ USB_PID_OUT); | |
1da177e4 LT |
871 | destination |= TD_TOKEN_TOGGLE; /* End in Data1 */ |
872 | ||
04538a25 | 873 | uhci_add_td_to_urbp(td, urbp); |
51e2f62f | 874 | uhci_fill_td(uhci, td, status | TD_CTRL_IOC, |
dccf4a48 | 875 | destination | uhci_explen(0), 0); |
af0bb599 AS |
876 | plink = &td->link; |
877 | ||
878 | /* | |
879 | * Build the new dummy TD and activate the old one | |
880 | */ | |
881 | td = uhci_alloc_td(uhci); | |
882 | if (!td) | |
883 | goto nomem; | |
51e2f62f | 884 | *plink = LINK_TO_TD(uhci, td); |
af0bb599 | 885 | |
51e2f62f | 886 | uhci_fill_td(uhci, td, 0, USB_PID_OUT | uhci_explen(0), 0); |
af0bb599 | 887 | wmb(); |
51e2f62f | 888 | qh->dummy_td->status |= cpu_to_hc32(uhci, TD_CTRL_ACTIVE); |
af0bb599 | 889 | qh->dummy_td = td; |
1da177e4 LT |
890 | |
891 | /* Low-speed transfers get a different queue, and won't hog the bus. | |
892 | * Also, some devices enumerate better without FSBR; the easiest way | |
893 | * to do that is to put URBs on the low-speed queue while the device | |
630aa3cf | 894 | * isn't in the CONFIGURED state. */ |
1da177e4 | 895 | if (urb->dev->speed == USB_SPEED_LOW || |
630aa3cf | 896 | urb->dev->state != USB_STATE_CONFIGURED) |
17230acd | 897 | skel = SKEL_LS_CONTROL; |
1da177e4 | 898 | else { |
17230acd | 899 | skel = SKEL_FS_CONTROL; |
84afddd7 | 900 | uhci_add_fsbr(uhci, urb); |
1da177e4 | 901 | } |
17230acd AS |
902 | if (qh->state != QH_STATE_ACTIVE) |
903 | qh->skel = skel; | |
dccf4a48 | 904 | return 0; |
af0bb599 AS |
905 | |
906 | nomem: | |
907 | /* Remove the dummy TD from the td_list so it doesn't get freed */ | |
04538a25 | 908 | uhci_remove_td_from_urbp(qh->dummy_td); |
af0bb599 | 909 | return -ENOMEM; |
1da177e4 LT |
910 | } |
911 | ||
1da177e4 LT |
912 | /* |
913 | * Common submit for bulk and interrupt | |
914 | */ | |
dccf4a48 AS |
915 | static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, |
916 | struct uhci_qh *qh) | |
1da177e4 LT |
917 | { |
918 | struct uhci_td *td; | |
1da177e4 | 919 | unsigned long destination, status; |
29cc8897 | 920 | int maxsze = usb_endpoint_maxp(&qh->hep->desc); |
1da177e4 | 921 | int len = urb->transfer_buffer_length; |
689d6eac ML |
922 | int this_sg_len; |
923 | dma_addr_t data; | |
51e2f62f | 924 | __hc32 *plink; |
04538a25 | 925 | struct urb_priv *urbp = urb->hcpriv; |
af0bb599 | 926 | unsigned int toggle; |
689d6eac ML |
927 | struct scatterlist *sg; |
928 | int i; | |
1da177e4 LT |
929 | |
930 | if (len < 0) | |
931 | return -EINVAL; | |
932 | ||
933 | /* The "pipe" thing contains the destination in bits 8--18 */ | |
934 | destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe); | |
af0bb599 AS |
935 | toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
936 | usb_pipeout(urb->pipe)); | |
1da177e4 | 937 | |
af0bb599 AS |
938 | /* 3 errors, dummy TD remains inactive */ |
939 | status = uhci_maxerr(3); | |
1da177e4 LT |
940 | if (urb->dev->speed == USB_SPEED_LOW) |
941 | status |= TD_CTRL_LS; | |
942 | if (usb_pipein(urb->pipe)) | |
943 | status |= TD_CTRL_SPD; | |
944 | ||
bc677d5b | 945 | i = urb->num_mapped_sgs; |
689d6eac ML |
946 | if (len > 0 && i > 0) { |
947 | sg = urb->sg; | |
948 | data = sg_dma_address(sg); | |
949 | ||
950 | /* urb->transfer_buffer_length may be smaller than the | |
951 | * size of the scatterlist (or vice versa) | |
952 | */ | |
953 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
954 | } else { | |
955 | sg = NULL; | |
956 | data = urb->transfer_dma; | |
957 | this_sg_len = len; | |
958 | } | |
1da177e4 | 959 | /* |
687f5f34 | 960 | * Build the DATA TDs |
1da177e4 | 961 | */ |
af0bb599 AS |
962 | plink = NULL; |
963 | td = qh->dummy_td; | |
689d6eac | 964 | for (;;) { /* Allow zero length packets */ |
1da177e4 LT |
965 | int pktsze = maxsze; |
966 | ||
dccf4a48 | 967 | if (len <= pktsze) { /* The last packet */ |
1da177e4 LT |
968 | pktsze = len; |
969 | if (!(urb->transfer_flags & URB_SHORT_NOT_OK)) | |
970 | status &= ~TD_CTRL_SPD; | |
971 | } | |
972 | ||
af0bb599 AS |
973 | if (plink) { |
974 | td = uhci_alloc_td(uhci); | |
975 | if (!td) | |
976 | goto nomem; | |
51e2f62f | 977 | *plink = LINK_TO_TD(uhci, td); |
af0bb599 | 978 | } |
04538a25 | 979 | uhci_add_td_to_urbp(td, urbp); |
51e2f62f | 980 | uhci_fill_td(uhci, td, status, |
af0bb599 AS |
981 | destination | uhci_explen(pktsze) | |
982 | (toggle << TD_TOKEN_TOGGLE_SHIFT), | |
983 | data); | |
dccf4a48 | 984 | plink = &td->link; |
af0bb599 | 985 | status |= TD_CTRL_ACTIVE; |
1da177e4 | 986 | |
689d6eac | 987 | toggle ^= 1; |
1da177e4 | 988 | data += pktsze; |
689d6eac | 989 | this_sg_len -= pktsze; |
1da177e4 | 990 | len -= maxsze; |
689d6eac ML |
991 | if (this_sg_len <= 0) { |
992 | if (--i <= 0 || len <= 0) | |
993 | break; | |
994 | sg = sg_next(sg); | |
995 | data = sg_dma_address(sg); | |
996 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
997 | } | |
998 | } | |
1da177e4 LT |
999 | |
1000 | /* | |
1001 | * URB_ZERO_PACKET means adding a 0-length packet, if direction | |
1002 | * is OUT and the transfer_length was an exact multiple of maxsze, | |
1003 | * hence (len = transfer_length - N * maxsze) == 0 | |
1004 | * however, if transfer_length == 0, the zero packet was already | |
1005 | * prepared above. | |
1006 | */ | |
dccf4a48 AS |
1007 | if ((urb->transfer_flags & URB_ZERO_PACKET) && |
1008 | usb_pipeout(urb->pipe) && len == 0 && | |
1009 | urb->transfer_buffer_length > 0) { | |
2532178a | 1010 | td = uhci_alloc_td(uhci); |
1da177e4 | 1011 | if (!td) |
af0bb599 | 1012 | goto nomem; |
51e2f62f | 1013 | *plink = LINK_TO_TD(uhci, td); |
1da177e4 | 1014 | |
04538a25 | 1015 | uhci_add_td_to_urbp(td, urbp); |
51e2f62f | 1016 | uhci_fill_td(uhci, td, status, |
af0bb599 AS |
1017 | destination | uhci_explen(0) | |
1018 | (toggle << TD_TOKEN_TOGGLE_SHIFT), | |
1019 | data); | |
1020 | plink = &td->link; | |
1da177e4 | 1021 | |
af0bb599 | 1022 | toggle ^= 1; |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | /* Set the interrupt-on-completion flag on the last packet. | |
1026 | * A more-or-less typical 4 KB URB (= size of one memory page) | |
1027 | * will require about 3 ms to transfer; that's a little on the | |
1028 | * fast side but not enough to justify delaying an interrupt | |
1029 | * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT | |
1030 | * flag setting. */ | |
51e2f62f | 1031 | td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
1da177e4 | 1032 | |
af0bb599 AS |
1033 | /* |
1034 | * Build the new dummy TD and activate the old one | |
1035 | */ | |
1036 | td = uhci_alloc_td(uhci); | |
1037 | if (!td) | |
1038 | goto nomem; | |
51e2f62f | 1039 | *plink = LINK_TO_TD(uhci, td); |
af0bb599 | 1040 | |
51e2f62f | 1041 | uhci_fill_td(uhci, td, 0, USB_PID_OUT | uhci_explen(0), 0); |
af0bb599 | 1042 | wmb(); |
51e2f62f | 1043 | qh->dummy_td->status |= cpu_to_hc32(uhci, TD_CTRL_ACTIVE); |
af0bb599 AS |
1044 | qh->dummy_td = td; |
1045 | ||
1046 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), | |
1047 | usb_pipeout(urb->pipe), toggle); | |
dccf4a48 | 1048 | return 0; |
af0bb599 AS |
1049 | |
1050 | nomem: | |
1051 | /* Remove the dummy TD from the td_list so it doesn't get freed */ | |
04538a25 | 1052 | uhci_remove_td_from_urbp(qh->dummy_td); |
af0bb599 | 1053 | return -ENOMEM; |
1da177e4 LT |
1054 | } |
1055 | ||
17230acd | 1056 | static int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, |
dccf4a48 | 1057 | struct uhci_qh *qh) |
1da177e4 LT |
1058 | { |
1059 | int ret; | |
1060 | ||
1061 | /* Can't have low-speed bulk transfers */ | |
1062 | if (urb->dev->speed == USB_SPEED_LOW) | |
1063 | return -EINVAL; | |
1064 | ||
17230acd AS |
1065 | if (qh->state != QH_STATE_ACTIVE) |
1066 | qh->skel = SKEL_BULK; | |
dccf4a48 AS |
1067 | ret = uhci_submit_common(uhci, urb, qh); |
1068 | if (ret == 0) | |
84afddd7 | 1069 | uhci_add_fsbr(uhci, urb); |
1da177e4 LT |
1070 | return ret; |
1071 | } | |
1072 | ||
caf3827a | 1073 | static int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, |
dccf4a48 | 1074 | struct uhci_qh *qh) |
1da177e4 | 1075 | { |
3ca2a321 | 1076 | int ret; |
caf3827a | 1077 | |
dccf4a48 AS |
1078 | /* USB 1.1 interrupt transfers only involve one packet per interval. |
1079 | * Drivers can submit URBs of any length, but longer ones will need | |
1080 | * multiple intervals to complete. | |
1da177e4 | 1081 | */ |
caf3827a | 1082 | |
3ca2a321 AS |
1083 | if (!qh->bandwidth_reserved) { |
1084 | int exponent; | |
caf3827a | 1085 | |
3ca2a321 AS |
1086 | /* Figure out which power-of-two queue to use */ |
1087 | for (exponent = 7; exponent >= 0; --exponent) { | |
1088 | if ((1 << exponent) <= urb->interval) | |
1089 | break; | |
1090 | } | |
1091 | if (exponent < 0) | |
1092 | return -EINVAL; | |
caf3827a | 1093 | |
e58dcebc AS |
1094 | /* If the slot is full, try a lower period */ |
1095 | do { | |
1096 | qh->period = 1 << exponent; | |
1097 | qh->skel = SKEL_INDEX(exponent); | |
1098 | ||
1099 | /* For now, interrupt phase is fixed by the layout | |
1100 | * of the QH lists. | |
1101 | */ | |
1102 | qh->phase = (qh->period / 2) & (MAX_PHASE - 1); | |
1103 | ret = uhci_check_bandwidth(uhci, qh); | |
1104 | } while (ret != 0 && --exponent >= 0); | |
3ca2a321 AS |
1105 | if (ret) |
1106 | return ret; | |
1107 | } else if (qh->period > urb->interval) | |
1108 | return -EINVAL; /* Can't decrease the period */ | |
1109 | ||
1110 | ret = uhci_submit_common(uhci, urb, qh); | |
1111 | if (ret == 0) { | |
1112 | urb->interval = qh->period; | |
1113 | if (!qh->bandwidth_reserved) | |
1114 | uhci_reserve_bandwidth(uhci, qh); | |
1115 | } | |
1116 | return ret; | |
1da177e4 LT |
1117 | } |
1118 | ||
b1869000 AS |
1119 | /* |
1120 | * Fix up the data structures following a short transfer | |
1121 | */ | |
1122 | static int uhci_fixup_short_transfer(struct uhci_hcd *uhci, | |
59e29ed9 | 1123 | struct uhci_qh *qh, struct urb_priv *urbp) |
b1869000 AS |
1124 | { |
1125 | struct uhci_td *td; | |
59e29ed9 AS |
1126 | struct list_head *tmp; |
1127 | int ret; | |
b1869000 AS |
1128 | |
1129 | td = list_entry(urbp->td_list.prev, struct uhci_td, list); | |
1130 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { | |
b1869000 AS |
1131 | |
1132 | /* When a control transfer is short, we have to restart | |
1133 | * the queue at the status stage transaction, which is | |
1134 | * the last TD. */ | |
59e29ed9 | 1135 | WARN_ON(list_empty(&urbp->td_list)); |
51e2f62f | 1136 | qh->element = LINK_TO_TD(uhci, td); |
59e29ed9 | 1137 | tmp = td->list.prev; |
b1869000 AS |
1138 | ret = -EINPROGRESS; |
1139 | ||
59e29ed9 | 1140 | } else { |
b1869000 AS |
1141 | |
1142 | /* When a bulk/interrupt transfer is short, we have to | |
1143 | * fix up the toggles of the following URBs on the queue | |
1144 | * before restarting the queue at the next URB. */ | |
51e2f62f JA |
1145 | qh->initial_toggle = |
1146 | uhci_toggle(td_token(uhci, qh->post_td)) ^ 1; | |
1147 | uhci_fixup_toggles(uhci, qh, 1); | |
b1869000 | 1148 | |
59e29ed9 AS |
1149 | if (list_empty(&urbp->td_list)) |
1150 | td = qh->post_td; | |
b1869000 | 1151 | qh->element = td->link; |
59e29ed9 AS |
1152 | tmp = urbp->td_list.prev; |
1153 | ret = 0; | |
b1869000 AS |
1154 | } |
1155 | ||
59e29ed9 AS |
1156 | /* Remove all the TDs we skipped over, from tmp back to the start */ |
1157 | while (tmp != &urbp->td_list) { | |
1158 | td = list_entry(tmp, struct uhci_td, list); | |
1159 | tmp = tmp->prev; | |
1160 | ||
04538a25 AS |
1161 | uhci_remove_td_from_urbp(td); |
1162 | uhci_free_td(uhci, td); | |
59e29ed9 | 1163 | } |
b1869000 AS |
1164 | return ret; |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Common result for control, bulk, and interrupt | |
1169 | */ | |
1170 | static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb) | |
1171 | { | |
1172 | struct urb_priv *urbp = urb->hcpriv; | |
1173 | struct uhci_qh *qh = urbp->qh; | |
59e29ed9 | 1174 | struct uhci_td *td, *tmp; |
b1869000 AS |
1175 | unsigned status; |
1176 | int ret = 0; | |
1177 | ||
59e29ed9 | 1178 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
b1869000 AS |
1179 | unsigned int ctrlstat; |
1180 | int len; | |
1181 | ||
51e2f62f | 1182 | ctrlstat = td_status(uhci, td); |
b1869000 AS |
1183 | status = uhci_status_bits(ctrlstat); |
1184 | if (status & TD_CTRL_ACTIVE) | |
1185 | return -EINPROGRESS; | |
1186 | ||
1187 | len = uhci_actual_length(ctrlstat); | |
1188 | urb->actual_length += len; | |
1189 | ||
1190 | if (status) { | |
1191 | ret = uhci_map_status(status, | |
51e2f62f | 1192 | uhci_packetout(td_token(uhci, td))); |
b1869000 AS |
1193 | if ((debug == 1 && ret != -EPIPE) || debug > 1) { |
1194 | /* Some debugging code */ | |
be3cbc5f | 1195 | dev_dbg(&urb->dev->dev, |
b1869000 | 1196 | "%s: failed with status %x\n", |
441b62c1 | 1197 | __func__, status); |
b1869000 AS |
1198 | |
1199 | if (debug > 1 && errbuf) { | |
1200 | /* Print the chain for debugging */ | |
e009f1b2 | 1201 | uhci_show_qh(uhci, urbp->qh, errbuf, |
13996ca7 | 1202 | ERRBUF_LEN - EXTRA_SPACE, 0); |
b1869000 AS |
1203 | lprintk(errbuf); |
1204 | } | |
1205 | } | |
1206 | ||
e7e7c360 | 1207 | /* Did we receive a short packet? */ |
51e2f62f | 1208 | } else if (len < uhci_expected_length(td_token(uhci, td))) { |
b1869000 | 1209 | |
e7e7c360 AS |
1210 | /* For control transfers, go to the status TD if |
1211 | * this isn't already the last data TD */ | |
1212 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { | |
1213 | if (td->list.next != urbp->td_list.prev) | |
1214 | ret = 1; | |
1215 | } | |
1216 | ||
1217 | /* For bulk and interrupt, this may be an error */ | |
1218 | else if (urb->transfer_flags & URB_SHORT_NOT_OK) | |
b1869000 | 1219 | ret = -EREMOTEIO; |
f443ddf1 AS |
1220 | |
1221 | /* Fixup needed only if this isn't the URB's last TD */ | |
1222 | else if (&td->list != urbp->td_list.prev) | |
b1869000 AS |
1223 | ret = 1; |
1224 | } | |
1225 | ||
04538a25 | 1226 | uhci_remove_td_from_urbp(td); |
59e29ed9 | 1227 | if (qh->post_td) |
04538a25 | 1228 | uhci_free_td(uhci, qh->post_td); |
59e29ed9 AS |
1229 | qh->post_td = td; |
1230 | ||
b1869000 AS |
1231 | if (ret != 0) |
1232 | goto err; | |
1233 | } | |
1234 | return ret; | |
1235 | ||
1236 | err: | |
1237 | if (ret < 0) { | |
b1869000 AS |
1238 | /* Note that the queue has stopped and save |
1239 | * the next toggle value */ | |
51e2f62f | 1240 | qh->element = UHCI_PTR_TERM(uhci); |
b1869000 AS |
1241 | qh->is_stopped = 1; |
1242 | qh->needs_fixup = (qh->type != USB_ENDPOINT_XFER_CONTROL); | |
51e2f62f | 1243 | qh->initial_toggle = uhci_toggle(td_token(uhci, td)) ^ |
b1869000 AS |
1244 | (ret == -EREMOTEIO); |
1245 | ||
1246 | } else /* Short packet received */ | |
59e29ed9 | 1247 | ret = uhci_fixup_short_transfer(uhci, qh, urbp); |
b1869000 AS |
1248 | return ret; |
1249 | } | |
1250 | ||
1da177e4 LT |
1251 | /* |
1252 | * Isochronous transfers | |
1253 | */ | |
0ed8fee1 AS |
1254 | static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb, |
1255 | struct uhci_qh *qh) | |
1da177e4 | 1256 | { |
0ed8fee1 | 1257 | struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */ |
c44b2250 AS |
1258 | int i; |
1259 | unsigned frame, next; | |
0ed8fee1 AS |
1260 | unsigned long destination, status; |
1261 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; | |
1da177e4 | 1262 | |
caf3827a AS |
1263 | /* Values must not be too big (could overflow below) */ |
1264 | if (urb->interval >= UHCI_NUMFRAMES || | |
1265 | urb->number_of_packets >= UHCI_NUMFRAMES) | |
1da177e4 LT |
1266 | return -EFBIG; |
1267 | ||
c44b2250 AS |
1268 | uhci_get_current_frame_number(uhci); |
1269 | ||
caf3827a | 1270 | /* Check the period and figure out the starting frame number */ |
3ca2a321 AS |
1271 | if (!qh->bandwidth_reserved) { |
1272 | qh->period = urb->interval; | |
c44b2250 AS |
1273 | qh->phase = -1; /* Find the best phase */ |
1274 | i = uhci_check_bandwidth(uhci, qh); | |
1275 | if (i) | |
1276 | return i; | |
1277 | ||
1278 | /* Allow a little time to allocate the TDs */ | |
1279 | next = uhci->frame_number + 10; | |
1280 | frame = qh->phase; | |
1281 | ||
1282 | /* Round up to the first available slot */ | |
1283 | frame += (next - frame + qh->period - 1) & -qh->period; | |
3ca2a321 | 1284 | |
caf3827a AS |
1285 | } else if (qh->period != urb->interval) { |
1286 | return -EINVAL; /* Can't change the period */ | |
1da177e4 | 1287 | |
7898ffc5 | 1288 | } else { |
e1944017 | 1289 | next = uhci->frame_number + 1; |
c44b2250 | 1290 | |
7898ffc5 | 1291 | /* Find the next unused frame */ |
0ed8fee1 | 1292 | if (list_empty(&qh->queue)) { |
c8155cc5 | 1293 | frame = qh->iso_frame; |
caf3827a AS |
1294 | } else { |
1295 | struct urb *lurb; | |
0ed8fee1 | 1296 | |
caf3827a | 1297 | lurb = list_entry(qh->queue.prev, |
0ed8fee1 | 1298 | struct urb_priv, node)->urb; |
caf3827a AS |
1299 | frame = lurb->start_frame + |
1300 | lurb->number_of_packets * | |
1301 | lurb->interval; | |
0ed8fee1 | 1302 | } |
c44b2250 AS |
1303 | |
1304 | /* Fell behind? */ | |
bef073b0 | 1305 | if (!uhci_frame_before_eq(next, frame)) { |
c44b2250 AS |
1306 | |
1307 | /* USB_ISO_ASAP: Round up to the first available slot */ | |
1308 | if (urb->transfer_flags & URB_ISO_ASAP) | |
1309 | frame += (next - frame + qh->period - 1) & | |
1310 | -qh->period; | |
1311 | ||
1312 | /* | |
bef073b0 AS |
1313 | * Not ASAP: Use the next slot in the stream, |
1314 | * no matter what. | |
7898ffc5 | 1315 | */ |
c44b2250 AS |
1316 | else if (!uhci_frame_before_eq(next, |
1317 | frame + (urb->number_of_packets - 1) * | |
1318 | qh->period)) | |
bef073b0 AS |
1319 | dev_dbg(uhci_dev(uhci), "iso underrun %p (%u+%u < %u)\n", |
1320 | urb, frame, | |
1321 | (urb->number_of_packets - 1) * | |
1322 | qh->period, | |
1323 | next); | |
c44b2250 | 1324 | } |
1da177e4 | 1325 | } |
1da177e4 | 1326 | |
caf3827a | 1327 | /* Make sure we won't have to go too far into the future */ |
c8155cc5 | 1328 | if (uhci_frame_before_eq(uhci->last_iso_frame + UHCI_NUMFRAMES, |
c44b2250 | 1329 | frame + urb->number_of_packets * urb->interval)) |
caf3827a | 1330 | return -EFBIG; |
c44b2250 | 1331 | urb->start_frame = frame; |
caf3827a AS |
1332 | |
1333 | status = TD_CTRL_ACTIVE | TD_CTRL_IOS; | |
1334 | destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe); | |
1335 | ||
b81d3436 | 1336 | for (i = 0; i < urb->number_of_packets; i++) { |
2532178a | 1337 | td = uhci_alloc_td(uhci); |
1da177e4 LT |
1338 | if (!td) |
1339 | return -ENOMEM; | |
1340 | ||
04538a25 | 1341 | uhci_add_td_to_urbp(td, urbp); |
51e2f62f | 1342 | uhci_fill_td(uhci, td, status, destination | |
dccf4a48 AS |
1343 | uhci_explen(urb->iso_frame_desc[i].length), |
1344 | urb->transfer_dma + | |
1345 | urb->iso_frame_desc[i].offset); | |
b81d3436 | 1346 | } |
1da177e4 | 1347 | |
dccf4a48 | 1348 | /* Set the interrupt-on-completion flag on the last packet. */ |
51e2f62f | 1349 | td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
dccf4a48 | 1350 | |
dccf4a48 | 1351 | /* Add the TDs to the frame list */ |
b81d3436 AS |
1352 | frame = urb->start_frame; |
1353 | list_for_each_entry(td, &urbp->td_list, list) { | |
dccf4a48 | 1354 | uhci_insert_td_in_frame_list(uhci, td, frame); |
c8155cc5 AS |
1355 | frame += qh->period; |
1356 | } | |
1357 | ||
1358 | if (list_empty(&qh->queue)) { | |
1359 | qh->iso_packet_desc = &urb->iso_frame_desc[0]; | |
1360 | qh->iso_frame = urb->start_frame; | |
1da177e4 LT |
1361 | } |
1362 | ||
17230acd | 1363 | qh->skel = SKEL_ISO; |
3ca2a321 AS |
1364 | if (!qh->bandwidth_reserved) |
1365 | uhci_reserve_bandwidth(uhci, qh); | |
dccf4a48 | 1366 | return 0; |
1da177e4 LT |
1367 | } |
1368 | ||
1369 | static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb) | |
1370 | { | |
c8155cc5 AS |
1371 | struct uhci_td *td, *tmp; |
1372 | struct urb_priv *urbp = urb->hcpriv; | |
1373 | struct uhci_qh *qh = urbp->qh; | |
1da177e4 | 1374 | |
c8155cc5 AS |
1375 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
1376 | unsigned int ctrlstat; | |
1377 | int status; | |
1da177e4 | 1378 | int actlength; |
1da177e4 | 1379 | |
c8155cc5 | 1380 | if (uhci_frame_before_eq(uhci->cur_iso_frame, qh->iso_frame)) |
1da177e4 LT |
1381 | return -EINPROGRESS; |
1382 | ||
c8155cc5 AS |
1383 | uhci_remove_tds_from_frame(uhci, qh->iso_frame); |
1384 | ||
51e2f62f | 1385 | ctrlstat = td_status(uhci, td); |
c8155cc5 AS |
1386 | if (ctrlstat & TD_CTRL_ACTIVE) { |
1387 | status = -EXDEV; /* TD was added too late? */ | |
1388 | } else { | |
1389 | status = uhci_map_status(uhci_status_bits(ctrlstat), | |
1390 | usb_pipeout(urb->pipe)); | |
1391 | actlength = uhci_actual_length(ctrlstat); | |
1392 | ||
1393 | urb->actual_length += actlength; | |
1394 | qh->iso_packet_desc->actual_length = actlength; | |
1395 | qh->iso_packet_desc->status = status; | |
1396 | } | |
ee7d1f3f | 1397 | if (status) |
1da177e4 | 1398 | urb->error_count++; |
1da177e4 | 1399 | |
c8155cc5 AS |
1400 | uhci_remove_td_from_urbp(td); |
1401 | uhci_free_td(uhci, td); | |
1402 | qh->iso_frame += qh->period; | |
1403 | ++qh->iso_packet_desc; | |
1da177e4 | 1404 | } |
ee7d1f3f | 1405 | return 0; |
1da177e4 LT |
1406 | } |
1407 | ||
1da177e4 | 1408 | static int uhci_urb_enqueue(struct usb_hcd *hcd, |
55016f10 | 1409 | struct urb *urb, gfp_t mem_flags) |
1da177e4 LT |
1410 | { |
1411 | int ret; | |
1412 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); | |
1413 | unsigned long flags; | |
dccf4a48 AS |
1414 | struct urb_priv *urbp; |
1415 | struct uhci_qh *qh; | |
1da177e4 LT |
1416 | |
1417 | spin_lock_irqsave(&uhci->lock, flags); | |
1418 | ||
e9df41c5 AS |
1419 | ret = usb_hcd_link_urb_to_ep(hcd, urb); |
1420 | if (ret) | |
1421 | goto done_not_linked; | |
1da177e4 | 1422 | |
dccf4a48 AS |
1423 | ret = -ENOMEM; |
1424 | urbp = uhci_alloc_urb_priv(uhci, urb); | |
1425 | if (!urbp) | |
1426 | goto done; | |
1da177e4 | 1427 | |
e9df41c5 AS |
1428 | if (urb->ep->hcpriv) |
1429 | qh = urb->ep->hcpriv; | |
dccf4a48 | 1430 | else { |
e9df41c5 | 1431 | qh = uhci_alloc_qh(uhci, urb->dev, urb->ep); |
dccf4a48 AS |
1432 | if (!qh) |
1433 | goto err_no_qh; | |
1da177e4 | 1434 | } |
dccf4a48 | 1435 | urbp->qh = qh; |
1da177e4 | 1436 | |
4de7d2c2 AS |
1437 | switch (qh->type) { |
1438 | case USB_ENDPOINT_XFER_CONTROL: | |
dccf4a48 AS |
1439 | ret = uhci_submit_control(uhci, urb, qh); |
1440 | break; | |
4de7d2c2 | 1441 | case USB_ENDPOINT_XFER_BULK: |
dccf4a48 | 1442 | ret = uhci_submit_bulk(uhci, urb, qh); |
1da177e4 | 1443 | break; |
4de7d2c2 | 1444 | case USB_ENDPOINT_XFER_INT: |
3ca2a321 | 1445 | ret = uhci_submit_interrupt(uhci, urb, qh); |
1da177e4 | 1446 | break; |
4de7d2c2 | 1447 | case USB_ENDPOINT_XFER_ISOC: |
c8155cc5 | 1448 | urb->error_count = 0; |
dccf4a48 | 1449 | ret = uhci_submit_isochronous(uhci, urb, qh); |
1da177e4 LT |
1450 | break; |
1451 | } | |
dccf4a48 AS |
1452 | if (ret != 0) |
1453 | goto err_submit_failed; | |
1da177e4 | 1454 | |
dccf4a48 | 1455 | /* Add this URB to the QH */ |
dccf4a48 | 1456 | list_add_tail(&urbp->node, &qh->queue); |
1da177e4 | 1457 | |
dccf4a48 AS |
1458 | /* If the new URB is the first and only one on this QH then either |
1459 | * the QH is new and idle or else it's unlinked and waiting to | |
2775562a AS |
1460 | * become idle, so we can activate it right away. But only if the |
1461 | * queue isn't stopped. */ | |
84afddd7 | 1462 | if (qh->queue.next == &urbp->node && !qh->is_stopped) { |
dccf4a48 | 1463 | uhci_activate_qh(uhci, qh); |
c5e3b741 | 1464 | uhci_urbp_wants_fsbr(uhci, urbp); |
84afddd7 | 1465 | } |
dccf4a48 AS |
1466 | goto done; |
1467 | ||
1468 | err_submit_failed: | |
1469 | if (qh->state == QH_STATE_IDLE) | |
1470 | uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */ | |
dccf4a48 AS |
1471 | err_no_qh: |
1472 | uhci_free_urb_priv(uhci, urbp); | |
dccf4a48 | 1473 | done: |
e9df41c5 AS |
1474 | if (ret) |
1475 | usb_hcd_unlink_urb_from_ep(hcd, urb); | |
1476 | done_not_linked: | |
1da177e4 LT |
1477 | spin_unlock_irqrestore(&uhci->lock, flags); |
1478 | return ret; | |
1479 | } | |
1480 | ||
e9df41c5 | 1481 | static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
0ed8fee1 AS |
1482 | { |
1483 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); | |
1484 | unsigned long flags; | |
10b8e47d | 1485 | struct uhci_qh *qh; |
e9df41c5 | 1486 | int rc; |
0ed8fee1 AS |
1487 | |
1488 | spin_lock_irqsave(&uhci->lock, flags); | |
e9df41c5 AS |
1489 | rc = usb_hcd_check_unlink_urb(hcd, urb, status); |
1490 | if (rc) | |
0ed8fee1 | 1491 | goto done; |
e9df41c5 AS |
1492 | |
1493 | qh = ((struct urb_priv *) urb->hcpriv)->qh; | |
0ed8fee1 AS |
1494 | |
1495 | /* Remove Isochronous TDs from the frame list ASAP */ | |
10b8e47d | 1496 | if (qh->type == USB_ENDPOINT_XFER_ISOC) { |
0ed8fee1 | 1497 | uhci_unlink_isochronous_tds(uhci, urb); |
10b8e47d AS |
1498 | mb(); |
1499 | ||
1500 | /* If the URB has already started, update the QH unlink time */ | |
1501 | uhci_get_current_frame_number(uhci); | |
1502 | if (uhci_frame_before_eq(urb->start_frame, uhci->frame_number)) | |
1503 | qh->unlink_frame = uhci->frame_number; | |
1504 | } | |
1505 | ||
1506 | uhci_unlink_qh(uhci, qh); | |
0ed8fee1 AS |
1507 | |
1508 | done: | |
1509 | spin_unlock_irqrestore(&uhci->lock, flags); | |
e9df41c5 | 1510 | return rc; |
0ed8fee1 AS |
1511 | } |
1512 | ||
1da177e4 | 1513 | /* |
0ed8fee1 | 1514 | * Finish unlinking an URB and give it back |
1da177e4 | 1515 | */ |
0ed8fee1 | 1516 | static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh, |
4a00027d | 1517 | struct urb *urb, int status) |
0ed8fee1 AS |
1518 | __releases(uhci->lock) |
1519 | __acquires(uhci->lock) | |
1da177e4 | 1520 | { |
dccf4a48 | 1521 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; |
1da177e4 | 1522 | |
e7e7c360 AS |
1523 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
1524 | ||
7ea0a2bc AS |
1525 | /* Subtract off the length of the SETUP packet from |
1526 | * urb->actual_length. | |
1527 | */ | |
1528 | urb->actual_length -= min_t(u32, 8, urb->actual_length); | |
e7e7c360 AS |
1529 | } |
1530 | ||
c8155cc5 AS |
1531 | /* When giving back the first URB in an Isochronous queue, |
1532 | * reinitialize the QH's iso-related members for the next URB. */ | |
e7e7c360 | 1533 | else if (qh->type == USB_ENDPOINT_XFER_ISOC && |
c8155cc5 AS |
1534 | urbp->node.prev == &qh->queue && |
1535 | urbp->node.next != &qh->queue) { | |
1536 | struct urb *nurb = list_entry(urbp->node.next, | |
1537 | struct urb_priv, node)->urb; | |
1538 | ||
1539 | qh->iso_packet_desc = &nurb->iso_frame_desc[0]; | |
1540 | qh->iso_frame = nurb->start_frame; | |
c8155cc5 | 1541 | } |
1da177e4 | 1542 | |
0ed8fee1 AS |
1543 | /* Take the URB off the QH's queue. If the queue is now empty, |
1544 | * this is a perfect time for a toggle fixup. */ | |
1545 | list_del_init(&urbp->node); | |
1546 | if (list_empty(&qh->queue) && qh->needs_fixup) { | |
1547 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), | |
1548 | usb_pipeout(urb->pipe), qh->initial_toggle); | |
1549 | qh->needs_fixup = 0; | |
1550 | } | |
1551 | ||
0ed8fee1 | 1552 | uhci_free_urb_priv(uhci, urbp); |
e9df41c5 | 1553 | usb_hcd_unlink_urb_from_ep(uhci_to_hcd(uhci), urb); |
1da177e4 | 1554 | |
0ed8fee1 | 1555 | spin_unlock(&uhci->lock); |
4a00027d | 1556 | usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, status); |
0ed8fee1 | 1557 | spin_lock(&uhci->lock); |
1da177e4 | 1558 | |
0ed8fee1 AS |
1559 | /* If the queue is now empty, we can unlink the QH and give up its |
1560 | * reserved bandwidth. */ | |
1561 | if (list_empty(&qh->queue)) { | |
1562 | uhci_unlink_qh(uhci, qh); | |
3ca2a321 AS |
1563 | if (qh->bandwidth_reserved) |
1564 | uhci_release_bandwidth(uhci, qh); | |
0ed8fee1 | 1565 | } |
dccf4a48 | 1566 | } |
1da177e4 | 1567 | |
dccf4a48 | 1568 | /* |
0ed8fee1 | 1569 | * Scan the URBs in a QH's queue |
dccf4a48 | 1570 | */ |
0ed8fee1 AS |
1571 | #define QH_FINISHED_UNLINKING(qh) \ |
1572 | (qh->state == QH_STATE_UNLINKING && \ | |
1573 | uhci->frame_number + uhci->is_stopped != qh->unlink_frame) | |
1da177e4 | 1574 | |
7d12e780 | 1575 | static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) |
1da177e4 | 1576 | { |
1da177e4 | 1577 | struct urb_priv *urbp; |
0ed8fee1 AS |
1578 | struct urb *urb; |
1579 | int status; | |
1da177e4 | 1580 | |
0ed8fee1 AS |
1581 | while (!list_empty(&qh->queue)) { |
1582 | urbp = list_entry(qh->queue.next, struct urb_priv, node); | |
1583 | urb = urbp->urb; | |
1da177e4 | 1584 | |
b1869000 | 1585 | if (qh->type == USB_ENDPOINT_XFER_ISOC) |
0ed8fee1 | 1586 | status = uhci_result_isochronous(uhci, urb); |
b1869000 | 1587 | else |
0ed8fee1 | 1588 | status = uhci_result_common(uhci, urb); |
0ed8fee1 AS |
1589 | if (status == -EINPROGRESS) |
1590 | break; | |
1da177e4 | 1591 | |
0ed8fee1 AS |
1592 | /* Dequeued but completed URBs can't be given back unless |
1593 | * the QH is stopped or has finished unlinking. */ | |
eb231054 | 1594 | if (urb->unlinked) { |
2775562a AS |
1595 | if (QH_FINISHED_UNLINKING(qh)) |
1596 | qh->is_stopped = 1; | |
1597 | else if (!qh->is_stopped) | |
1598 | return; | |
1599 | } | |
1da177e4 | 1600 | |
4a00027d | 1601 | uhci_giveback_urb(uhci, qh, urb, status); |
ee7d1f3f | 1602 | if (status < 0) |
0ed8fee1 AS |
1603 | break; |
1604 | } | |
1da177e4 | 1605 | |
0ed8fee1 AS |
1606 | /* If the QH is neither stopped nor finished unlinking (normal case), |
1607 | * our work here is done. */ | |
2775562a AS |
1608 | if (QH_FINISHED_UNLINKING(qh)) |
1609 | qh->is_stopped = 1; | |
1610 | else if (!qh->is_stopped) | |
0ed8fee1 | 1611 | return; |
1da177e4 | 1612 | |
0ed8fee1 | 1613 | /* Otherwise give back each of the dequeued URBs */ |
2775562a | 1614 | restart: |
0ed8fee1 AS |
1615 | list_for_each_entry(urbp, &qh->queue, node) { |
1616 | urb = urbp->urb; | |
eb231054 | 1617 | if (urb->unlinked) { |
10b8e47d AS |
1618 | |
1619 | /* Fix up the TD links and save the toggles for | |
1620 | * non-Isochronous queues. For Isochronous queues, | |
1621 | * test for too-recent dequeues. */ | |
1622 | if (!uhci_cleanup_queue(uhci, qh, urb)) { | |
1623 | qh->is_stopped = 0; | |
1624 | return; | |
1625 | } | |
4a00027d | 1626 | uhci_giveback_urb(uhci, qh, urb, 0); |
0ed8fee1 AS |
1627 | goto restart; |
1628 | } | |
1629 | } | |
1630 | qh->is_stopped = 0; | |
1da177e4 | 1631 | |
0ed8fee1 AS |
1632 | /* There are no more dequeued URBs. If there are still URBs on the |
1633 | * queue, the QH can now be re-activated. */ | |
1634 | if (!list_empty(&qh->queue)) { | |
1635 | if (qh->needs_fixup) | |
51e2f62f | 1636 | uhci_fixup_toggles(uhci, qh, 0); |
84afddd7 AS |
1637 | |
1638 | /* If the first URB on the queue wants FSBR but its time | |
1639 | * limit has expired, set the next TD to interrupt on | |
1640 | * completion before reactivating the QH. */ | |
1641 | urbp = list_entry(qh->queue.next, struct urb_priv, node); | |
1642 | if (urbp->fsbr && qh->wait_expired) { | |
1643 | struct uhci_td *td = list_entry(urbp->td_list.next, | |
1644 | struct uhci_td, list); | |
1645 | ||
51e2f62f | 1646 | td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
84afddd7 AS |
1647 | } |
1648 | ||
0ed8fee1 | 1649 | uhci_activate_qh(uhci, qh); |
1da177e4 LT |
1650 | } |
1651 | ||
0ed8fee1 AS |
1652 | /* The queue is empty. The QH can become idle if it is fully |
1653 | * unlinked. */ | |
1654 | else if (QH_FINISHED_UNLINKING(qh)) | |
1655 | uhci_make_qh_idle(uhci, qh); | |
1da177e4 LT |
1656 | } |
1657 | ||
84afddd7 AS |
1658 | /* |
1659 | * Check for queues that have made some forward progress. | |
1660 | * Returns 0 if the queue is not Isochronous, is ACTIVE, and | |
1661 | * has not advanced since last examined; 1 otherwise. | |
b761d9d8 AS |
1662 | * |
1663 | * Early Intel controllers have a bug which causes qh->element sometimes | |
1664 | * not to advance when a TD completes successfully. The queue remains | |
1665 | * stuck on the inactive completed TD. We detect such cases and advance | |
1666 | * the element pointer by hand. | |
84afddd7 AS |
1667 | */ |
1668 | static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh) | |
1669 | { | |
1670 | struct urb_priv *urbp = NULL; | |
1671 | struct uhci_td *td; | |
1672 | int ret = 1; | |
1673 | unsigned status; | |
1674 | ||
1675 | if (qh->type == USB_ENDPOINT_XFER_ISOC) | |
c5e3b741 | 1676 | goto done; |
84afddd7 AS |
1677 | |
1678 | /* Treat an UNLINKING queue as though it hasn't advanced. | |
1679 | * This is okay because reactivation will treat it as though | |
1680 | * it has advanced, and if it is going to become IDLE then | |
1681 | * this doesn't matter anyway. Furthermore it's possible | |
1682 | * for an UNLINKING queue not to have any URBs at all, or | |
1683 | * for its first URB not to have any TDs (if it was dequeued | |
1684 | * just as it completed). So it's not easy in any case to | |
1685 | * test whether such queues have advanced. */ | |
1686 | if (qh->state != QH_STATE_ACTIVE) { | |
1687 | urbp = NULL; | |
1688 | status = 0; | |
1689 | ||
1690 | } else { | |
1691 | urbp = list_entry(qh->queue.next, struct urb_priv, node); | |
1692 | td = list_entry(urbp->td_list.next, struct uhci_td, list); | |
51e2f62f | 1693 | status = td_status(uhci, td); |
84afddd7 AS |
1694 | if (!(status & TD_CTRL_ACTIVE)) { |
1695 | ||
1696 | /* We're okay, the queue has advanced */ | |
1697 | qh->wait_expired = 0; | |
1698 | qh->advance_jiffies = jiffies; | |
c5e3b741 | 1699 | goto done; |
84afddd7 | 1700 | } |
ba297edd | 1701 | ret = uhci->is_stopped; |
84afddd7 AS |
1702 | } |
1703 | ||
1704 | /* The queue hasn't advanced; check for timeout */ | |
c5e3b741 AS |
1705 | if (qh->wait_expired) |
1706 | goto done; | |
1707 | ||
1708 | if (time_after(jiffies, qh->advance_jiffies + QH_WAIT_TIMEOUT)) { | |
b761d9d8 AS |
1709 | |
1710 | /* Detect the Intel bug and work around it */ | |
51e2f62f JA |
1711 | if (qh->post_td && qh_element(qh) == |
1712 | LINK_TO_TD(uhci, qh->post_td)) { | |
b761d9d8 AS |
1713 | qh->element = qh->post_td->link; |
1714 | qh->advance_jiffies = jiffies; | |
c5e3b741 AS |
1715 | ret = 1; |
1716 | goto done; | |
b761d9d8 AS |
1717 | } |
1718 | ||
84afddd7 AS |
1719 | qh->wait_expired = 1; |
1720 | ||
1721 | /* If the current URB wants FSBR, unlink it temporarily | |
1722 | * so that we can safely set the next TD to interrupt on | |
1723 | * completion. That way we'll know as soon as the queue | |
1724 | * starts moving again. */ | |
1725 | if (urbp && urbp->fsbr && !(status & TD_CTRL_IOC)) | |
1726 | uhci_unlink_qh(uhci, qh); | |
c5e3b741 AS |
1727 | |
1728 | } else { | |
1729 | /* Unmoving but not-yet-expired queues keep FSBR alive */ | |
1730 | if (urbp) | |
1731 | uhci_urbp_wants_fsbr(uhci, urbp); | |
84afddd7 | 1732 | } |
c5e3b741 AS |
1733 | |
1734 | done: | |
84afddd7 AS |
1735 | return ret; |
1736 | } | |
1737 | ||
0ed8fee1 AS |
1738 | /* |
1739 | * Process events in the schedule, but only in one thread at a time | |
1740 | */ | |
7d12e780 | 1741 | static void uhci_scan_schedule(struct uhci_hcd *uhci) |
1da177e4 | 1742 | { |
0ed8fee1 AS |
1743 | int i; |
1744 | struct uhci_qh *qh; | |
1da177e4 LT |
1745 | |
1746 | /* Don't allow re-entrant calls */ | |
1747 | if (uhci->scan_in_progress) { | |
1748 | uhci->need_rescan = 1; | |
1749 | return; | |
1750 | } | |
1751 | uhci->scan_in_progress = 1; | |
84afddd7 | 1752 | rescan: |
1da177e4 | 1753 | uhci->need_rescan = 0; |
c5e3b741 | 1754 | uhci->fsbr_is_wanted = 0; |
1da177e4 | 1755 | |
6c1b445c | 1756 | uhci_clear_next_interrupt(uhci); |
1da177e4 | 1757 | uhci_get_current_frame_number(uhci); |
c8155cc5 | 1758 | uhci->cur_iso_frame = uhci->frame_number; |
1da177e4 | 1759 | |
0ed8fee1 AS |
1760 | /* Go through all the QH queues and process the URBs in each one */ |
1761 | for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) { | |
1762 | uhci->next_qh = list_entry(uhci->skelqh[i]->node.next, | |
1763 | struct uhci_qh, node); | |
1764 | while ((qh = uhci->next_qh) != uhci->skelqh[i]) { | |
1765 | uhci->next_qh = list_entry(qh->node.next, | |
1766 | struct uhci_qh, node); | |
84afddd7 AS |
1767 | |
1768 | if (uhci_advance_check(uhci, qh)) { | |
7d12e780 | 1769 | uhci_scan_qh(uhci, qh); |
c5e3b741 AS |
1770 | if (qh->state == QH_STATE_ACTIVE) { |
1771 | uhci_urbp_wants_fsbr(uhci, | |
1772 | list_entry(qh->queue.next, struct urb_priv, node)); | |
1773 | } | |
84afddd7 | 1774 | } |
0ed8fee1 | 1775 | } |
1da177e4 | 1776 | } |
1da177e4 | 1777 | |
c8155cc5 | 1778 | uhci->last_iso_frame = uhci->cur_iso_frame; |
1da177e4 LT |
1779 | if (uhci->need_rescan) |
1780 | goto rescan; | |
1781 | uhci->scan_in_progress = 0; | |
1782 | ||
c5e3b741 AS |
1783 | if (uhci->fsbr_is_on && !uhci->fsbr_is_wanted && |
1784 | !uhci->fsbr_expiring) { | |
1785 | uhci->fsbr_expiring = 1; | |
1786 | mod_timer(&uhci->fsbr_timer, jiffies + FSBR_OFF_DELAY); | |
1787 | } | |
84afddd7 | 1788 | |
04538a25 | 1789 | if (list_empty(&uhci->skel_unlink_qh->node)) |
1da177e4 LT |
1790 | uhci_clear_next_interrupt(uhci); |
1791 | else | |
1792 | uhci_set_next_interrupt(uhci); | |
1da177e4 | 1793 | } |