blob: 8949b239deccac8ab31f7a0a2c1560abef8f3575 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2001-2004 by David Brownell
3 * Copyright (c) 2003 Michal Sojka, for high-speed iso transfers
David Brownell53bd6a62006-08-30 14:50:06 -07004 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20/* this file is part of ehci-hcd.c */
21
22/*-------------------------------------------------------------------------*/
23
24/*
25 * EHCI scheduled transaction support: interrupt, iso, split iso
26 * These are called "periodic" transactions in the EHCI spec.
27 *
28 * Note that for interrupt transfers, the QH/QTD manipulation is shared
29 * with the "asynchronous" transaction support (control/bulk transfers).
30 * The only real difference is in how interrupt transfers are scheduled.
31 *
32 * For ISO, we make an "iso_stream" head to serve the same role as a QH.
33 * It keeps track of every ITD (or SITD) that's linked, and holds enough
34 * pre-calculated schedule data to make appending to the queue be quick.
35 */
36
37static int ehci_get_frame (struct usb_hcd *hcd);
38
Alan Stern21f25cd2011-10-12 10:39:14 -040039#ifdef CONFIG_PCI
40
41static unsigned ehci_read_frame_index(struct ehci_hcd *ehci)
42{
43 unsigned uf;
44
45 /*
46 * The MosChip MCS9990 controller updates its microframe counter
47 * a little before the frame counter, and occasionally we will read
48 * the invalid intermediate value. Avoid problems by checking the
49 * microframe number (the low-order 3 bits); if they are 0 then
50 * re-read the register to get the correct value.
51 */
52 uf = ehci_readl(ehci, &ehci->regs->frame_index);
53 if (unlikely(ehci->frame_index_bug && ((uf & 7) == 0)))
54 uf = ehci_readl(ehci, &ehci->regs->frame_index);
55 return uf;
56}
57
58#endif
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060/*-------------------------------------------------------------------------*/
61
62/*
63 * periodic_next_shadow - return "next" pointer on shadow list
64 * @periodic: host pointer to qh/itd/sitd
65 * @tag: hardware tag for type of this record
66 */
67static union ehci_shadow *
Stefan Roese6dbd6822007-05-01 09:29:37 -070068periodic_next_shadow(struct ehci_hcd *ehci, union ehci_shadow *periodic,
69 __hc32 tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Stefan Roese6dbd6822007-05-01 09:29:37 -070071 switch (hc32_to_cpu(ehci, tag)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 case Q_TYPE_QH:
73 return &periodic->qh->qh_next;
74 case Q_TYPE_FSTN:
75 return &periodic->fstn->fstn_next;
76 case Q_TYPE_ITD:
77 return &periodic->itd->itd_next;
78 // case Q_TYPE_SITD:
79 default:
80 return &periodic->sitd->sitd_next;
81 }
82}
83
Alek Du3807e262009-07-14 07:23:29 +080084static __hc32 *
85shadow_next_periodic(struct ehci_hcd *ehci, union ehci_shadow *periodic,
86 __hc32 tag)
87{
88 switch (hc32_to_cpu(ehci, tag)) {
89 /* our ehci_shadow.qh is actually software part */
90 case Q_TYPE_QH:
91 return &periodic->qh->hw->hw_next;
92 /* others are hw parts */
93 default:
94 return periodic->hw_next;
95 }
96}
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098/* caller must hold ehci->lock */
99static void periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr)
100{
Stefan Roese6dbd6822007-05-01 09:29:37 -0700101 union ehci_shadow *prev_p = &ehci->pshadow[frame];
102 __hc32 *hw_p = &ehci->periodic[frame];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 union ehci_shadow here = *prev_p;
104
105 /* find predecessor of "ptr"; hw and shadow lists are in sync */
106 while (here.ptr && here.ptr != ptr) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700107 prev_p = periodic_next_shadow(ehci, prev_p,
108 Q_NEXT_TYPE(ehci, *hw_p));
Alek Du3807e262009-07-14 07:23:29 +0800109 hw_p = shadow_next_periodic(ehci, &here,
110 Q_NEXT_TYPE(ehci, *hw_p));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 here = *prev_p;
112 }
113 /* an interrupt entry (at list end) could have been shared */
114 if (!here.ptr)
115 return;
116
117 /* update shadow and hardware lists ... the old "next" pointers
118 * from ptr may still be in use, the caller updates them.
119 */
Stefan Roese6dbd6822007-05-01 09:29:37 -0700120 *prev_p = *periodic_next_shadow(ehci, &here,
121 Q_NEXT_TYPE(ehci, *hw_p));
Andiry Xu3d091a62010-11-08 17:58:35 +0800122
123 if (!ehci->use_dummy_qh ||
124 *shadow_next_periodic(ehci, &here, Q_NEXT_TYPE(ehci, *hw_p))
125 != EHCI_LIST_END(ehci))
126 *hw_p = *shadow_next_periodic(ehci, &here,
127 Q_NEXT_TYPE(ehci, *hw_p));
128 else
129 *hw_p = ehci->dummy->qh_dma;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130}
131
132/* how many of the uframe's 125 usecs are allocated? */
133static unsigned short
134periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe)
135{
Stefan Roese6dbd6822007-05-01 09:29:37 -0700136 __hc32 *hw_p = &ehci->periodic [frame];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 union ehci_shadow *q = &ehci->pshadow [frame];
138 unsigned usecs = 0;
Alek Du3807e262009-07-14 07:23:29 +0800139 struct ehci_qh_hw *hw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 while (q->ptr) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700142 switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 case Q_TYPE_QH:
Alek Du3807e262009-07-14 07:23:29 +0800144 hw = q->qh->hw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 /* is it in the S-mask? */
Alek Du3807e262009-07-14 07:23:29 +0800146 if (hw->hw_info2 & cpu_to_hc32(ehci, 1 << uframe))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 usecs += q->qh->usecs;
148 /* ... or C-mask? */
Alek Du3807e262009-07-14 07:23:29 +0800149 if (hw->hw_info2 & cpu_to_hc32(ehci,
Stefan Roese6dbd6822007-05-01 09:29:37 -0700150 1 << (8 + uframe)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 usecs += q->qh->c_usecs;
Alek Du3807e262009-07-14 07:23:29 +0800152 hw_p = &hw->hw_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 q = &q->qh->qh_next;
154 break;
155 // case Q_TYPE_FSTN:
156 default:
157 /* for "save place" FSTNs, count the relevant INTR
158 * bandwidth from the previous frame
159 */
Stefan Roese6dbd6822007-05-01 09:29:37 -0700160 if (q->fstn->hw_prev != EHCI_LIST_END(ehci)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 ehci_dbg (ehci, "ignoring FSTN cost ...\n");
162 }
163 hw_p = &q->fstn->hw_next;
164 q = &q->fstn->fstn_next;
165 break;
166 case Q_TYPE_ITD:
Karsten Wiese3b6fcfd2007-12-30 21:55:05 -0800167 if (q->itd->hw_transaction[uframe])
168 usecs += q->itd->stream->usecs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 hw_p = &q->itd->hw_next;
170 q = &q->itd->itd_next;
171 break;
172 case Q_TYPE_SITD:
173 /* is it in the S-mask? (count SPLIT, DATA) */
Stefan Roese6dbd6822007-05-01 09:29:37 -0700174 if (q->sitd->hw_uframe & cpu_to_hc32(ehci,
175 1 << uframe)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 if (q->sitd->hw_fullspeed_ep &
Stefan Roese6dbd6822007-05-01 09:29:37 -0700177 cpu_to_hc32(ehci, 1<<31))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 usecs += q->sitd->stream->usecs;
179 else /* worst case for OUT start-split */
180 usecs += HS_USECS_ISO (188);
181 }
182
183 /* ... C-mask? (count CSPLIT, DATA) */
184 if (q->sitd->hw_uframe &
Stefan Roese6dbd6822007-05-01 09:29:37 -0700185 cpu_to_hc32(ehci, 1 << (8 + uframe))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 /* worst case for IN complete-split */
187 usecs += q->sitd->stream->c_usecs;
188 }
189
190 hw_p = &q->sitd->hw_next;
191 q = &q->sitd->sitd_next;
192 break;
193 }
194 }
195#ifdef DEBUG
196 if (usecs > 100)
197 ehci_err (ehci, "uframe %d sched overrun: %d usecs\n",
198 frame * 8 + uframe, usecs);
199#endif
200 return usecs;
201}
202
203/*-------------------------------------------------------------------------*/
204
205static int same_tt (struct usb_device *dev1, struct usb_device *dev2)
206{
207 if (!dev1->tt || !dev2->tt)
208 return 0;
209 if (dev1->tt != dev2->tt)
210 return 0;
211 if (dev1->tt->multi)
212 return dev1->ttport == dev2->ttport;
213 else
214 return 1;
215}
216
Dan Streetmanba47f662006-05-24 09:39:16 -0700217#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
218
219/* Which uframe does the low/fullspeed transfer start in?
220 *
221 * The parameter is the mask of ssplits in "H-frame" terms
222 * and this returns the transfer start uframe in "B-frame" terms,
223 * which allows both to match, e.g. a ssplit in "H-frame" uframe 0
224 * will cause a transfer in "B-frame" uframe 0. "B-frames" lag
225 * "H-frames" by 1 uframe. See the EHCI spec sec 4.5 and figure 4.7.
226 */
Stefan Roese6dbd6822007-05-01 09:29:37 -0700227static inline unsigned char tt_start_uframe(struct ehci_hcd *ehci, __hc32 mask)
Dan Streetmanba47f662006-05-24 09:39:16 -0700228{
Stefan Roese6dbd6822007-05-01 09:29:37 -0700229 unsigned char smask = QH_SMASK & hc32_to_cpu(ehci, mask);
Dan Streetmanba47f662006-05-24 09:39:16 -0700230 if (!smask) {
231 ehci_err(ehci, "invalid empty smask!\n");
232 /* uframe 7 can't have bw so this will indicate failure */
233 return 7;
234 }
235 return ffs(smask) - 1;
236}
237
238static const unsigned char
239max_tt_usecs[] = { 125, 125, 125, 125, 125, 125, 30, 0 };
240
241/* carryover low/fullspeed bandwidth that crosses uframe boundries */
242static inline void carryover_tt_bandwidth(unsigned short tt_usecs[8])
243{
244 int i;
245 for (i=0; i<7; i++) {
246 if (max_tt_usecs[i] < tt_usecs[i]) {
247 tt_usecs[i+1] += tt_usecs[i] - max_tt_usecs[i];
248 tt_usecs[i] = max_tt_usecs[i];
249 }
250 }
251}
252
253/* How many of the tt's periodic downstream 1000 usecs are allocated?
254 *
255 * While this measures the bandwidth in terms of usecs/uframe,
256 * the low/fullspeed bus has no notion of uframes, so any particular
257 * low/fullspeed transfer can "carry over" from one uframe to the next,
258 * since the TT just performs downstream transfers in sequence.
259 *
Joe Perchesdc0d5c12007-12-17 11:40:18 -0800260 * For example two separate 100 usec transfers can start in the same uframe,
Dan Streetmanba47f662006-05-24 09:39:16 -0700261 * and the second one would "carry over" 75 usecs into the next uframe.
262 */
263static void
264periodic_tt_usecs (
265 struct ehci_hcd *ehci,
266 struct usb_device *dev,
267 unsigned frame,
268 unsigned short tt_usecs[8]
269)
270{
Stefan Roese6dbd6822007-05-01 09:29:37 -0700271 __hc32 *hw_p = &ehci->periodic [frame];
Dan Streetmanba47f662006-05-24 09:39:16 -0700272 union ehci_shadow *q = &ehci->pshadow [frame];
273 unsigned char uf;
274
275 memset(tt_usecs, 0, 16);
276
277 while (q->ptr) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700278 switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) {
Dan Streetmanba47f662006-05-24 09:39:16 -0700279 case Q_TYPE_ITD:
280 hw_p = &q->itd->hw_next;
281 q = &q->itd->itd_next;
282 continue;
283 case Q_TYPE_QH:
284 if (same_tt(dev, q->qh->dev)) {
Alek Du3807e262009-07-14 07:23:29 +0800285 uf = tt_start_uframe(ehci, q->qh->hw->hw_info2);
Dan Streetmanba47f662006-05-24 09:39:16 -0700286 tt_usecs[uf] += q->qh->tt_usecs;
287 }
Alek Du3807e262009-07-14 07:23:29 +0800288 hw_p = &q->qh->hw->hw_next;
Dan Streetmanba47f662006-05-24 09:39:16 -0700289 q = &q->qh->qh_next;
290 continue;
291 case Q_TYPE_SITD:
292 if (same_tt(dev, q->sitd->urb->dev)) {
293 uf = tt_start_uframe(ehci, q->sitd->hw_uframe);
294 tt_usecs[uf] += q->sitd->stream->tt_usecs;
295 }
296 hw_p = &q->sitd->hw_next;
297 q = &q->sitd->sitd_next;
298 continue;
299 // case Q_TYPE_FSTN:
300 default:
Stefan Roese6dbd6822007-05-01 09:29:37 -0700301 ehci_dbg(ehci, "ignoring periodic frame %d FSTN\n",
302 frame);
Dan Streetmanba47f662006-05-24 09:39:16 -0700303 hw_p = &q->fstn->hw_next;
304 q = &q->fstn->fstn_next;
305 }
306 }
307
308 carryover_tt_bandwidth(tt_usecs);
309
310 if (max_tt_usecs[7] < tt_usecs[7])
311 ehci_err(ehci, "frame %d tt sched overrun: %d usecs\n",
312 frame, tt_usecs[7] - max_tt_usecs[7]);
313}
314
315/*
316 * Return true if the device's tt's downstream bus is available for a
317 * periodic transfer of the specified length (usecs), starting at the
318 * specified frame/uframe. Note that (as summarized in section 11.19
319 * of the usb 2.0 spec) TTs can buffer multiple transactions for each
320 * uframe.
321 *
322 * The uframe parameter is when the fullspeed/lowspeed transfer
323 * should be executed in "B-frame" terms, which is the same as the
324 * highspeed ssplit's uframe (which is in "H-frame" terms). For example
325 * a ssplit in "H-frame" 0 causes a transfer in "B-frame" 0.
326 * See the EHCI spec sec 4.5 and fig 4.7.
327 *
328 * This checks if the full/lowspeed bus, at the specified starting uframe,
329 * has the specified bandwidth available, according to rules listed
330 * in USB 2.0 spec section 11.18.1 fig 11-60.
331 *
332 * This does not check if the transfer would exceed the max ssplit
333 * limit of 16, specified in USB 2.0 spec section 11.18.4 requirement #4,
334 * since proper scheduling limits ssplits to less than 16 per uframe.
335 */
336static int tt_available (
337 struct ehci_hcd *ehci,
338 unsigned period,
339 struct usb_device *dev,
340 unsigned frame,
341 unsigned uframe,
342 u16 usecs
343)
344{
345 if ((period == 0) || (uframe >= 7)) /* error */
346 return 0;
347
348 for (; frame < ehci->periodic_size; frame += period) {
349 unsigned short tt_usecs[8];
350
351 periodic_tt_usecs (ehci, dev, frame, tt_usecs);
352
353 ehci_vdbg(ehci, "tt frame %d check %d usecs start uframe %d in"
354 " schedule %d/%d/%d/%d/%d/%d/%d/%d\n",
355 frame, usecs, uframe,
356 tt_usecs[0], tt_usecs[1], tt_usecs[2], tt_usecs[3],
357 tt_usecs[4], tt_usecs[5], tt_usecs[6], tt_usecs[7]);
358
359 if (max_tt_usecs[uframe] <= tt_usecs[uframe]) {
360 ehci_vdbg(ehci, "frame %d uframe %d fully scheduled\n",
361 frame, uframe);
362 return 0;
363 }
364
365 /* special case for isoc transfers larger than 125us:
366 * the first and each subsequent fully used uframe
367 * must be empty, so as to not illegally delay
368 * already scheduled transactions
369 */
370 if (125 < usecs) {
Dan Streetmanc065c602009-04-21 13:37:12 -0400371 int ufs = (usecs / 125);
Dan Streetmanba47f662006-05-24 09:39:16 -0700372 int i;
373 for (i = uframe; i < (uframe + ufs) && i < 8; i++)
374 if (0 < tt_usecs[i]) {
375 ehci_vdbg(ehci,
376 "multi-uframe xfer can't fit "
377 "in frame %d uframe %d\n",
378 frame, i);
379 return 0;
380 }
381 }
382
383 tt_usecs[uframe] += usecs;
384
385 carryover_tt_bandwidth(tt_usecs);
386
387 /* fail if the carryover pushed bw past the last uframe's limit */
388 if (max_tt_usecs[7] < tt_usecs[7]) {
389 ehci_vdbg(ehci,
390 "tt unavailable usecs %d frame %d uframe %d\n",
391 usecs, frame, uframe);
392 return 0;
393 }
394 }
395
396 return 1;
397}
398
399#else
400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401/* return true iff the device's transaction translator is available
402 * for a periodic transfer starting at the specified frame, using
403 * all the uframes in the mask.
404 */
405static int tt_no_collision (
406 struct ehci_hcd *ehci,
407 unsigned period,
408 struct usb_device *dev,
409 unsigned frame,
410 u32 uf_mask
411)
412{
413 if (period == 0) /* error */
414 return 0;
415
416 /* note bandwidth wastage: split never follows csplit
417 * (different dev or endpoint) until the next uframe.
418 * calling convention doesn't make that distinction.
419 */
420 for (; frame < ehci->periodic_size; frame += period) {
421 union ehci_shadow here;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700422 __hc32 type;
Alek Du3807e262009-07-14 07:23:29 +0800423 struct ehci_qh_hw *hw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 here = ehci->pshadow [frame];
Stefan Roese6dbd6822007-05-01 09:29:37 -0700426 type = Q_NEXT_TYPE(ehci, ehci->periodic [frame]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 while (here.ptr) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700428 switch (hc32_to_cpu(ehci, type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 case Q_TYPE_ITD:
Stefan Roese6dbd6822007-05-01 09:29:37 -0700430 type = Q_NEXT_TYPE(ehci, here.itd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 here = here.itd->itd_next;
432 continue;
433 case Q_TYPE_QH:
Alek Du3807e262009-07-14 07:23:29 +0800434 hw = here.qh->hw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 if (same_tt (dev, here.qh->dev)) {
436 u32 mask;
437
Stefan Roese6dbd6822007-05-01 09:29:37 -0700438 mask = hc32_to_cpu(ehci,
Alek Du3807e262009-07-14 07:23:29 +0800439 hw->hw_info2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 /* "knows" no gap is needed */
441 mask |= mask >> 8;
442 if (mask & uf_mask)
443 break;
444 }
Alek Du3807e262009-07-14 07:23:29 +0800445 type = Q_NEXT_TYPE(ehci, hw->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 here = here.qh->qh_next;
447 continue;
448 case Q_TYPE_SITD:
449 if (same_tt (dev, here.sitd->urb->dev)) {
450 u16 mask;
451
Stefan Roese6dbd6822007-05-01 09:29:37 -0700452 mask = hc32_to_cpu(ehci, here.sitd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 ->hw_uframe);
454 /* FIXME assumes no gap for IN! */
455 mask |= mask >> 8;
456 if (mask & uf_mask)
457 break;
458 }
Stefan Roese6dbd6822007-05-01 09:29:37 -0700459 type = Q_NEXT_TYPE(ehci, here.sitd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 here = here.sitd->sitd_next;
461 continue;
462 // case Q_TYPE_FSTN:
463 default:
464 ehci_dbg (ehci,
465 "periodic frame %d bogus type %d\n",
466 frame, type);
467 }
468
469 /* collision or error */
470 return 0;
471 }
472 }
473
474 /* no collision */
475 return 1;
476}
477
Dan Streetmanba47f662006-05-24 09:39:16 -0700478#endif /* CONFIG_USB_EHCI_TT_NEWSCHED */
479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480/*-------------------------------------------------------------------------*/
481
482static int enable_periodic (struct ehci_hcd *ehci)
483{
484 u32 cmd;
485 int status;
486
David Brownell01c17142008-08-26 23:35:04 -0700487 if (ehci->periodic_sched++)
488 return 0;
489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 /* did clearing PSE did take effect yet?
491 * takes effect only at frame boundaries...
492 */
Karsten Wiesec765d4c2008-02-16 13:44:42 -0800493 status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
494 STS_PSS, 0, 9 * 125);
Alan Stern69fff592011-05-17 17:27:12 -0400495 if (status) {
496 usb_hc_died(ehci_to_hcd(ehci));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return status;
Alan Stern69fff592011-05-17 17:27:12 -0400498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
Benjamin Herrenschmidt083522d2006-12-15 06:54:08 +1100500 cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE;
501 ehci_writel(ehci, cmd, &ehci->regs->command);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 /* posted write ... PSS happens later */
503 ehci_to_hcd(ehci)->state = HC_STATE_RUNNING;
504
505 /* make sure ehci_work scans these */
Alan Stern21f25cd2011-10-12 10:39:14 -0400506 ehci->next_uframe = ehci_read_frame_index(ehci)
Benjamin Herrenschmidt083522d2006-12-15 06:54:08 +1100507 % (ehci->periodic_size << 3);
Oliver Neukumee4ecb82009-11-27 15:17:59 +0100508 if (unlikely(ehci->broken_periodic))
509 ehci->last_periodic_enable = ktime_get_real();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return 0;
511}
512
513static int disable_periodic (struct ehci_hcd *ehci)
514{
515 u32 cmd;
516 int status;
517
David Brownell01c17142008-08-26 23:35:04 -0700518 if (--ehci->periodic_sched)
519 return 0;
520
Oliver Neukumee4ecb82009-11-27 15:17:59 +0100521 if (unlikely(ehci->broken_periodic)) {
522 /* delay experimentally determined */
523 ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
524 ktime_t now = ktime_get_real();
525 s64 delay = ktime_us_delta(safe, now);
526
527 if (unlikely(delay > 0))
528 udelay(delay);
529 }
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 /* did setting PSE not take effect yet?
532 * takes effect only at frame boundaries...
533 */
Karsten Wiesec765d4c2008-02-16 13:44:42 -0800534 status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
535 STS_PSS, STS_PSS, 9 * 125);
Alan Stern69fff592011-05-17 17:27:12 -0400536 if (status) {
537 usb_hc_died(ehci_to_hcd(ehci));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 return status;
Alan Stern69fff592011-05-17 17:27:12 -0400539 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Benjamin Herrenschmidt083522d2006-12-15 06:54:08 +1100541 cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE;
542 ehci_writel(ehci, cmd, &ehci->regs->command);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 /* posted write ... */
544
Alan Stern0e5f2312010-04-08 16:56:37 -0400545 free_cached_lists(ehci);
Dmitri Epshteind63c66d2009-12-14 17:17:33 +0200546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 ehci->next_uframe = -1;
548 return 0;
549}
550
551/*-------------------------------------------------------------------------*/
552
553/* periodic schedule slots have iso tds (normal or split) first, then a
554 * sparse tree for active interrupt transfers.
555 *
556 * this just links in a qh; caller guarantees uframe masks are set right.
557 * no FSTN support (yet; ehci 0.96+)
558 */
559static int qh_link_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh)
560{
561 unsigned i;
562 unsigned period = qh->period;
563
564 dev_dbg (&qh->dev->dev,
565 "link qh%d-%04x/%p start %d [%d/%d us]\n",
Alek Du3807e262009-07-14 07:23:29 +0800566 period, hc32_to_cpup(ehci, &qh->hw->hw_info2)
567 & (QH_CMASK | QH_SMASK),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 qh, qh->start, qh->usecs, qh->c_usecs);
569
570 /* high bandwidth, or otherwise every microframe */
571 if (period == 0)
572 period = 1;
573
574 for (i = qh->start; i < ehci->periodic_size; i += period) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700575 union ehci_shadow *prev = &ehci->pshadow[i];
576 __hc32 *hw_p = &ehci->periodic[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 union ehci_shadow here = *prev;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700578 __hc32 type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 /* skip the iso nodes at list head */
581 while (here.ptr) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700582 type = Q_NEXT_TYPE(ehci, *hw_p);
583 if (type == cpu_to_hc32(ehci, Q_TYPE_QH))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 break;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700585 prev = periodic_next_shadow(ehci, prev, type);
Alek Du3807e262009-07-14 07:23:29 +0800586 hw_p = shadow_next_periodic(ehci, &here, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 here = *prev;
588 }
589
590 /* sorting each branch by period (slow-->fast)
591 * enables sharing interior tree nodes
592 */
593 while (here.ptr && qh != here.qh) {
594 if (qh->period > here.qh->period)
595 break;
596 prev = &here.qh->qh_next;
Alek Du3807e262009-07-14 07:23:29 +0800597 hw_p = &here.qh->hw->hw_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 here = *prev;
599 }
600 /* link in this qh, unless some earlier pass did that */
601 if (qh != here.qh) {
602 qh->qh_next = here;
603 if (here.qh)
Alek Du3807e262009-07-14 07:23:29 +0800604 qh->hw->hw_next = *hw_p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 wmb ();
606 prev->qh = qh;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700607 *hw_p = QH_NEXT (ehci, qh->qh_dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 }
609 }
610 qh->qh_state = QH_STATE_LINKED;
Alan Sternef4638f2009-07-31 10:41:40 -0400611 qh->xacterrs = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 qh_get (qh);
613
614 /* update per-qh bandwidth for usbfs */
615 ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period
616 ? ((qh->usecs + qh->c_usecs) / qh->period)
617 : (qh->usecs * 8);
618
619 /* maybe enable periodic schedule processing */
David Brownell01c17142008-08-26 23:35:04 -0700620 return enable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621}
622
David Brownell01c17142008-08-26 23:35:04 -0700623static int qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
625 unsigned i;
626 unsigned period;
627
628 // FIXME:
629 // IF this isn't high speed
630 // and this qh is active in the current uframe
631 // (and overlay token SplitXstate is false?)
632 // THEN
Harvey Harrison551509d2009-02-11 14:11:36 -0800633 // qh->hw_info1 |= cpu_to_hc32(1 << 7 /* "ignore" */);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635 /* high bandwidth, or otherwise part of every microframe */
636 if ((period = qh->period) == 0)
637 period = 1;
638
639 for (i = qh->start; i < ehci->periodic_size; i += period)
640 periodic_unlink (ehci, i, qh);
641
642 /* update per-qh bandwidth for usbfs */
643 ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->period
644 ? ((qh->usecs + qh->c_usecs) / qh->period)
645 : (qh->usecs * 8);
646
647 dev_dbg (&qh->dev->dev,
648 "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
David Brownell7dedacf2005-08-04 18:06:41 -0700649 qh->period,
Alek Du3807e262009-07-14 07:23:29 +0800650 hc32_to_cpup(ehci, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 qh, qh->start, qh->usecs, qh->c_usecs);
652
653 /* qh->qh_next still "live" to HC */
654 qh->qh_state = QH_STATE_UNLINK;
655 qh->qh_next.ptr = NULL;
656 qh_put (qh);
657
658 /* maybe turn off periodic schedule */
David Brownell01c17142008-08-26 23:35:04 -0700659 return disable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660}
661
662static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh)
663{
Alan Sterna448c9d2009-08-19 12:22:44 -0400664 unsigned wait;
665 struct ehci_qh_hw *hw = qh->hw;
666 int rc;
667
668 /* If the QH isn't linked then there's nothing we can do
669 * unless we were called during a giveback, in which case
670 * qh_completions() has to deal with it.
671 */
672 if (qh->qh_state != QH_STATE_LINKED) {
673 if (qh->qh_state == QH_STATE_COMPLETING)
674 qh->needs_rescan = 1;
675 return;
676 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 qh_unlink_periodic (ehci, qh);
679
680 /* simple/paranoid: always delay, expecting the HC needs to read
681 * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
682 * expect khubd to clean up after any CSPLITs we won't issue.
683 * active high speed queues may need bigger delays...
684 */
685 if (list_empty (&qh->qtd_list)
Stefan Roese6dbd6822007-05-01 09:29:37 -0700686 || (cpu_to_hc32(ehci, QH_CMASK)
Alek Du3807e262009-07-14 07:23:29 +0800687 & hw->hw_info2) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 wait = 2;
689 else
690 wait = 55; /* worst case: 3 * 1024 */
691
692 udelay (wait);
693 qh->qh_state = QH_STATE_IDLE;
Alek Du3807e262009-07-14 07:23:29 +0800694 hw->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 wmb ();
Alan Sterna448c9d2009-08-19 12:22:44 -0400696
697 qh_completions(ehci, qh);
698
699 /* reschedule QH iff another request is queued */
700 if (!list_empty(&qh->qtd_list) &&
701 HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
702 rc = qh_schedule(ehci, qh);
703
704 /* An error here likely indicates handshake failure
705 * or no space left in the schedule. Neither fault
706 * should happen often ...
707 *
708 * FIXME kill the now-dysfunctional queued urbs
709 */
710 if (rc != 0)
711 ehci_err(ehci, "can't reschedule qh %p, err %d\n",
712 qh, rc);
713 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714}
715
716/*-------------------------------------------------------------------------*/
717
718static int check_period (
David Brownell53bd6a62006-08-30 14:50:06 -0700719 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 unsigned frame,
721 unsigned uframe,
722 unsigned period,
723 unsigned usecs
724) {
725 int claimed;
726
727 /* complete split running into next frame?
728 * given FSTN support, we could sometimes check...
729 */
730 if (uframe >= 8)
731 return 0;
732
733 /*
734 * 80% periodic == 100 usec/uframe available
David Brownell53bd6a62006-08-30 14:50:06 -0700735 * convert "usecs we need" to "max already claimed"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 */
737 usecs = 100 - usecs;
738
739 /* we "know" 2 and 4 uframe intervals were rejected; so
740 * for period 0, check _every_ microframe in the schedule.
741 */
742 if (unlikely (period == 0)) {
743 do {
744 for (uframe = 0; uframe < 7; uframe++) {
745 claimed = periodic_usecs (ehci, frame, uframe);
746 if (claimed > usecs)
747 return 0;
748 }
749 } while ((frame += 1) < ehci->periodic_size);
750
751 /* just check the specified uframe, at that period */
752 } else {
753 do {
754 claimed = periodic_usecs (ehci, frame, uframe);
755 if (claimed > usecs)
756 return 0;
757 } while ((frame += period) < ehci->periodic_size);
758 }
759
760 // success!
761 return 1;
762}
763
764static int check_intr_schedule (
David Brownell53bd6a62006-08-30 14:50:06 -0700765 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 unsigned frame,
767 unsigned uframe,
768 const struct ehci_qh *qh,
Stefan Roese6dbd6822007-05-01 09:29:37 -0700769 __hc32 *c_maskp
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770)
771{
David Brownell53bd6a62006-08-30 14:50:06 -0700772 int retval = -ENOSPC;
Dan Streetmanba47f662006-05-24 09:39:16 -0700773 u8 mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
775 if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
776 goto done;
777
778 if (!check_period (ehci, frame, uframe, qh->period, qh->usecs))
779 goto done;
780 if (!qh->c_usecs) {
781 retval = 0;
782 *c_maskp = 0;
783 goto done;
784 }
785
Dan Streetmanba47f662006-05-24 09:39:16 -0700786#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
787 if (tt_available (ehci, qh->period, qh->dev, frame, uframe,
788 qh->tt_usecs)) {
789 unsigned i;
790
791 /* TODO : this may need FSTN for SSPLIT in uframe 5. */
792 for (i=uframe+1; i<8 && i<uframe+4; i++)
793 if (!check_period (ehci, frame, i,
794 qh->period, qh->c_usecs))
795 goto done;
796 else
797 mask |= 1 << i;
798
799 retval = 0;
800
Stefan Roese6dbd6822007-05-01 09:29:37 -0700801 *c_maskp = cpu_to_hc32(ehci, mask << 8);
Dan Streetmanba47f662006-05-24 09:39:16 -0700802 }
803#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 /* Make sure this tt's buffer is also available for CSPLITs.
805 * We pessimize a bit; probably the typical full speed case
806 * doesn't need the second CSPLIT.
David Brownell53bd6a62006-08-30 14:50:06 -0700807 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 * NOTE: both SPLIT and CSPLIT could be checked in just
809 * one smart pass...
810 */
811 mask = 0x03 << (uframe + qh->gap_uf);
Stefan Roese6dbd6822007-05-01 09:29:37 -0700812 *c_maskp = cpu_to_hc32(ehci, mask << 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 mask |= 1 << uframe;
815 if (tt_no_collision (ehci, qh->period, qh->dev, frame, mask)) {
816 if (!check_period (ehci, frame, uframe + qh->gap_uf + 1,
817 qh->period, qh->c_usecs))
818 goto done;
819 if (!check_period (ehci, frame, uframe + qh->gap_uf,
820 qh->period, qh->c_usecs))
821 goto done;
822 retval = 0;
823 }
Dan Streetmanba47f662006-05-24 09:39:16 -0700824#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825done:
826 return retval;
827}
828
829/* "first fit" scheduling policy used the first time through,
830 * or when the previous schedule slot can't be re-used.
831 */
Stefan Roese6dbd6822007-05-01 09:29:37 -0700832static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833{
David Brownell53bd6a62006-08-30 14:50:06 -0700834 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 unsigned uframe;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700836 __hc32 c_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
Alek Du3807e262009-07-14 07:23:29 +0800838 struct ehci_qh_hw *hw = qh->hw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
840 qh_refresh(ehci, qh);
Alek Du3807e262009-07-14 07:23:29 +0800841 hw->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 frame = qh->start;
843
844 /* reuse the previous schedule slots, if we can */
845 if (frame < qh->period) {
Alek Du3807e262009-07-14 07:23:29 +0800846 uframe = ffs(hc32_to_cpup(ehci, &hw->hw_info2) & QH_SMASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 status = check_intr_schedule (ehci, frame, --uframe,
848 qh, &c_mask);
849 } else {
850 uframe = 0;
851 c_mask = 0;
852 status = -ENOSPC;
853 }
854
855 /* else scan the schedule to find a group of slots such that all
856 * uframes have enough periodic bandwidth available.
857 */
858 if (status) {
859 /* "normal" case, uframing flexible except with splits */
860 if (qh->period) {
Alan Stern68335e82009-05-22 17:02:33 -0400861 int i;
862
863 for (i = qh->period; status && i > 0; --i) {
864 frame = ++ehci->random_frame % qh->period;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 for (uframe = 0; uframe < 8; uframe++) {
866 status = check_intr_schedule (ehci,
867 frame, uframe, qh,
868 &c_mask);
869 if (status == 0)
870 break;
871 }
Alan Stern68335e82009-05-22 17:02:33 -0400872 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 /* qh->period == 0 means every uframe */
875 } else {
876 frame = 0;
877 status = check_intr_schedule (ehci, 0, 0, qh, &c_mask);
878 }
879 if (status)
880 goto done;
881 qh->start = frame;
882
883 /* reset S-frame and (maybe) C-frame masks */
Alek Du3807e262009-07-14 07:23:29 +0800884 hw->hw_info2 &= cpu_to_hc32(ehci, ~(QH_CMASK | QH_SMASK));
885 hw->hw_info2 |= qh->period
Stefan Roese6dbd6822007-05-01 09:29:37 -0700886 ? cpu_to_hc32(ehci, 1 << uframe)
887 : cpu_to_hc32(ehci, QH_SMASK);
Alek Du3807e262009-07-14 07:23:29 +0800888 hw->hw_info2 |= c_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 } else
890 ehci_dbg (ehci, "reused qh %p schedule\n", qh);
891
892 /* stuff into the periodic schedule */
David Brownell53bd6a62006-08-30 14:50:06 -0700893 status = qh_link_periodic (ehci, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894done:
895 return status;
896}
897
898static int intr_submit (
899 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 struct urb *urb,
901 struct list_head *qtd_list,
Al Viro55016f12005-10-21 03:21:58 -0400902 gfp_t mem_flags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903) {
904 unsigned epnum;
905 unsigned long flags;
906 struct ehci_qh *qh;
Alan Sterne9df41c2007-08-08 11:48:02 -0400907 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 struct list_head empty;
909
910 /* get endpoint and transfer/schedule data */
Alan Sterne9df41c2007-08-08 11:48:02 -0400911 epnum = urb->ep->desc.bEndpointAddress;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
913 spin_lock_irqsave (&ehci->lock, flags);
914
Alan Stern541c7d42010-06-22 16:39:10 -0400915 if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +1100916 status = -ESHUTDOWN;
Alan Sterne9df41c2007-08-08 11:48:02 -0400917 goto done_not_linked;
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +1100918 }
Alan Sterne9df41c2007-08-08 11:48:02 -0400919 status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
920 if (unlikely(status))
921 goto done_not_linked;
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +1100922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 /* get qh and force any scheduling errors */
924 INIT_LIST_HEAD (&empty);
Alan Sterne9df41c2007-08-08 11:48:02 -0400925 qh = qh_append_tds(ehci, urb, &empty, epnum, &urb->ep->hcpriv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (qh == NULL) {
927 status = -ENOMEM;
928 goto done;
929 }
930 if (qh->qh_state == QH_STATE_IDLE) {
931 if ((status = qh_schedule (ehci, qh)) != 0)
932 goto done;
933 }
934
935 /* then queue the urb's tds to the qh */
Alan Sterne9df41c2007-08-08 11:48:02 -0400936 qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 BUG_ON (qh == NULL);
938
939 /* ... update usbfs periodic stats */
940 ehci_to_hcd(ehci)->self.bandwidth_int_reqs++;
941
942done:
Alan Sterne9df41c2007-08-08 11:48:02 -0400943 if (unlikely(status))
944 usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
945done_not_linked:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 spin_unlock_irqrestore (&ehci->lock, flags);
947 if (status)
948 qtd_list_free (ehci, urb, qtd_list);
949
950 return status;
951}
952
953/*-------------------------------------------------------------------------*/
954
955/* ehci_iso_stream ops work with both ITD and SITD */
956
957static struct ehci_iso_stream *
Al Viro55016f12005-10-21 03:21:58 -0400958iso_stream_alloc (gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959{
960 struct ehci_iso_stream *stream;
961
Pekka Enberg7b842b62005-09-06 15:18:34 -0700962 stream = kzalloc(sizeof *stream, mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 if (likely (stream != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 INIT_LIST_HEAD(&stream->td_list);
965 INIT_LIST_HEAD(&stream->free_list);
966 stream->next_uframe = -1;
967 stream->refcount = 1;
968 }
969 return stream;
970}
971
972static void
973iso_stream_init (
974 struct ehci_hcd *ehci,
975 struct ehci_iso_stream *stream,
976 struct usb_device *dev,
977 int pipe,
978 unsigned interval
979)
980{
981 static const u8 smask_out [] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f };
982
983 u32 buf1;
984 unsigned epnum, maxp;
985 int is_input;
986 long bandwidth;
987
988 /*
989 * this might be a "high bandwidth" highspeed endpoint,
990 * as encoded in the ep descriptor's wMaxPacket field
991 */
992 epnum = usb_pipeendpoint (pipe);
993 is_input = usb_pipein (pipe) ? USB_DIR_IN : 0;
994 maxp = usb_maxpacket(dev, pipe, !is_input);
995 if (is_input) {
996 buf1 = (1 << 11);
997 } else {
998 buf1 = 0;
999 }
1000
1001 /* knows about ITD vs SITD */
1002 if (dev->speed == USB_SPEED_HIGH) {
1003 unsigned multi = hb_mult(maxp);
1004
1005 stream->highspeed = 1;
1006
1007 maxp = max_packet(maxp);
1008 buf1 |= maxp;
1009 maxp *= multi;
1010
Stefan Roese6dbd6822007-05-01 09:29:37 -07001011 stream->buf0 = cpu_to_hc32(ehci, (epnum << 8) | dev->devnum);
1012 stream->buf1 = cpu_to_hc32(ehci, buf1);
1013 stream->buf2 = cpu_to_hc32(ehci, multi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015 /* usbfs wants to report the average usecs per frame tied up
1016 * when transfers on this endpoint are scheduled ...
1017 */
1018 stream->usecs = HS_USECS_ISO (maxp);
1019 bandwidth = stream->usecs * 8;
Alan Stern372dd6e2008-11-12 17:02:57 -05001020 bandwidth /= interval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
1022 } else {
1023 u32 addr;
david-b@pacbell.netd0384202005-08-13 18:44:58 -07001024 int think_time;
Clemens Ladisch469d0222006-01-20 13:49:10 -08001025 int hs_transfers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027 addr = dev->ttport << 24;
1028 if (!ehci_is_TDI(ehci)
1029 || (dev->tt->hub !=
1030 ehci_to_hcd(ehci)->self.root_hub))
1031 addr |= dev->tt->hub->devnum << 16;
1032 addr |= epnum << 8;
1033 addr |= dev->devnum;
1034 stream->usecs = HS_USECS_ISO (maxp);
david-b@pacbell.netd0384202005-08-13 18:44:58 -07001035 think_time = dev->tt ? dev->tt->think_time : 0;
1036 stream->tt_usecs = NS_TO_US (think_time + usb_calc_bus_time (
1037 dev->speed, is_input, 1, maxp));
Clemens Ladisch469d0222006-01-20 13:49:10 -08001038 hs_transfers = max (1u, (maxp + 187) / 188);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 if (is_input) {
1040 u32 tmp;
1041
1042 addr |= 1 << 31;
1043 stream->c_usecs = stream->usecs;
1044 stream->usecs = HS_USECS_ISO (1);
1045 stream->raw_mask = 1;
1046
Clemens Ladisch469d0222006-01-20 13:49:10 -08001047 /* c-mask as specified in USB 2.0 11.18.4 3.c */
1048 tmp = (1 << (hs_transfers + 2)) - 1;
1049 stream->raw_mask |= tmp << (8 + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 } else
Clemens Ladisch469d0222006-01-20 13:49:10 -08001051 stream->raw_mask = smask_out [hs_transfers - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 bandwidth = stream->usecs + stream->c_usecs;
Alan Stern372dd6e2008-11-12 17:02:57 -05001053 bandwidth /= interval << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
1055 /* stream->splits gets created from raw_mask later */
Stefan Roese6dbd6822007-05-01 09:29:37 -07001056 stream->address = cpu_to_hc32(ehci, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 }
1058 stream->bandwidth = bandwidth;
1059
1060 stream->udev = dev;
1061
1062 stream->bEndpointAddress = is_input | epnum;
1063 stream->interval = interval;
1064 stream->maxp = maxp;
1065}
1066
1067static void
1068iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream)
1069{
1070 stream->refcount--;
1071
1072 /* free whenever just a dev->ep reference remains.
1073 * not like a QH -- no persistent state (toggle, halt)
1074 */
1075 if (stream->refcount == 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 // BUG_ON (!list_empty(&stream->td_list));
1077
1078 while (!list_empty (&stream->free_list)) {
1079 struct list_head *entry;
1080
1081 entry = stream->free_list.next;
1082 list_del (entry);
1083
1084 /* knows about ITD vs SITD */
1085 if (stream->highspeed) {
1086 struct ehci_itd *itd;
1087
1088 itd = list_entry (entry, struct ehci_itd,
1089 itd_list);
1090 dma_pool_free (ehci->itd_pool, itd,
1091 itd->itd_dma);
1092 } else {
1093 struct ehci_sitd *sitd;
1094
1095 sitd = list_entry (entry, struct ehci_sitd,
1096 sitd_list);
1097 dma_pool_free (ehci->sitd_pool, sitd,
1098 sitd->sitd_dma);
1099 }
1100 }
1101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 stream->bEndpointAddress &= 0x0f;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08001103 if (stream->ep)
1104 stream->ep->hcpriv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 kfree(stream);
1107 }
1108}
1109
1110static inline struct ehci_iso_stream *
1111iso_stream_get (struct ehci_iso_stream *stream)
1112{
1113 if (likely (stream != NULL))
1114 stream->refcount++;
1115 return stream;
1116}
1117
1118static struct ehci_iso_stream *
1119iso_stream_find (struct ehci_hcd *ehci, struct urb *urb)
1120{
1121 unsigned epnum;
1122 struct ehci_iso_stream *stream;
1123 struct usb_host_endpoint *ep;
1124 unsigned long flags;
1125
1126 epnum = usb_pipeendpoint (urb->pipe);
1127 if (usb_pipein(urb->pipe))
1128 ep = urb->dev->ep_in[epnum];
1129 else
1130 ep = urb->dev->ep_out[epnum];
1131
1132 spin_lock_irqsave (&ehci->lock, flags);
1133 stream = ep->hcpriv;
1134
1135 if (unlikely (stream == NULL)) {
1136 stream = iso_stream_alloc(GFP_ATOMIC);
1137 if (likely (stream != NULL)) {
1138 /* dev->ep owns the initial refcount */
1139 ep->hcpriv = stream;
1140 stream->ep = ep;
1141 iso_stream_init(ehci, stream, urb->dev, urb->pipe,
1142 urb->interval);
1143 }
1144
Clemens Ladisch1082f572010-03-01 17:18:56 +01001145 /* if dev->ep [epnum] is a QH, hw is set */
1146 } else if (unlikely (stream->hw != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 ehci_dbg (ehci, "dev %s ep%d%s, not iso??\n",
1148 urb->dev->devpath, epnum,
1149 usb_pipein(urb->pipe) ? "in" : "out");
1150 stream = NULL;
1151 }
1152
1153 /* caller guarantees an eventual matching iso_stream_put */
1154 stream = iso_stream_get (stream);
1155
1156 spin_unlock_irqrestore (&ehci->lock, flags);
1157 return stream;
1158}
1159
1160/*-------------------------------------------------------------------------*/
1161
1162/* ehci_iso_sched ops can be ITD-only or SITD-only */
1163
1164static struct ehci_iso_sched *
Al Viro55016f12005-10-21 03:21:58 -04001165iso_sched_alloc (unsigned packets, gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166{
1167 struct ehci_iso_sched *iso_sched;
1168 int size = sizeof *iso_sched;
1169
1170 size += packets * sizeof (struct ehci_iso_packet);
Eric Sesterhenn80b6ca42006-02-27 21:29:43 +01001171 iso_sched = kzalloc(size, mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 if (likely (iso_sched != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 INIT_LIST_HEAD (&iso_sched->td_list);
1174 }
1175 return iso_sched;
1176}
1177
1178static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001179itd_sched_init(
1180 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 struct ehci_iso_sched *iso_sched,
1182 struct ehci_iso_stream *stream,
1183 struct urb *urb
1184)
1185{
1186 unsigned i;
1187 dma_addr_t dma = urb->transfer_dma;
1188
1189 /* how many uframes are needed for these transfers */
1190 iso_sched->span = urb->number_of_packets * stream->interval;
1191
1192 /* figure out per-uframe itd fields that we'll need later
1193 * when we fit new itds into the schedule.
1194 */
1195 for (i = 0; i < urb->number_of_packets; i++) {
1196 struct ehci_iso_packet *uframe = &iso_sched->packet [i];
1197 unsigned length;
1198 dma_addr_t buf;
1199 u32 trans;
1200
1201 length = urb->iso_frame_desc [i].length;
1202 buf = dma + urb->iso_frame_desc [i].offset;
1203
1204 trans = EHCI_ISOC_ACTIVE;
1205 trans |= buf & 0x0fff;
1206 if (unlikely (((i + 1) == urb->number_of_packets))
1207 && !(urb->transfer_flags & URB_NO_INTERRUPT))
1208 trans |= EHCI_ITD_IOC;
1209 trans |= length << 16;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001210 uframe->transaction = cpu_to_hc32(ehci, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
David Brownell77078572005-05-28 10:46:18 -07001212 /* might need to cross a buffer page within a uframe */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 uframe->bufp = (buf & ~(u64)0x0fff);
1214 buf += length;
1215 if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff))))
1216 uframe->cross = 1;
1217 }
1218}
1219
1220static void
1221iso_sched_free (
1222 struct ehci_iso_stream *stream,
1223 struct ehci_iso_sched *iso_sched
1224)
1225{
1226 if (!iso_sched)
1227 return;
1228 // caller must hold ehci->lock!
1229 list_splice (&iso_sched->td_list, &stream->free_list);
1230 kfree (iso_sched);
1231}
1232
1233static int
1234itd_urb_transaction (
1235 struct ehci_iso_stream *stream,
1236 struct ehci_hcd *ehci,
1237 struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04001238 gfp_t mem_flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239)
1240{
1241 struct ehci_itd *itd;
1242 dma_addr_t itd_dma;
1243 int i;
1244 unsigned num_itds;
1245 struct ehci_iso_sched *sched;
1246 unsigned long flags;
1247
1248 sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
1249 if (unlikely (sched == NULL))
1250 return -ENOMEM;
1251
Stefan Roese6dbd6822007-05-01 09:29:37 -07001252 itd_sched_init(ehci, sched, stream, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
1254 if (urb->interval < 8)
1255 num_itds = 1 + (sched->span + 7) / 8;
1256 else
1257 num_itds = urb->number_of_packets;
1258
1259 /* allocate/init ITDs */
1260 spin_lock_irqsave (&ehci->lock, flags);
1261 for (i = 0; i < num_itds; i++) {
1262
1263 /* free_list.next might be cache-hot ... but maybe
1264 * the HC caches it too. avoid that issue for now.
1265 */
1266
1267 /* prefer previously-allocated itds */
1268 if (likely (!list_empty(&stream->free_list))) {
1269 itd = list_entry (stream->free_list.prev,
Stefan Roese6dbd6822007-05-01 09:29:37 -07001270 struct ehci_itd, itd_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 list_del (&itd->itd_list);
1272 itd_dma = itd->itd_dma;
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001273 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 spin_unlock_irqrestore (&ehci->lock, flags);
1275 itd = dma_pool_alloc (ehci->itd_pool, mem_flags,
1276 &itd_dma);
1277 spin_lock_irqsave (&ehci->lock, flags);
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001278 if (!itd) {
1279 iso_sched_free(stream, sched);
1280 spin_unlock_irqrestore(&ehci->lock, flags);
1281 return -ENOMEM;
1282 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 }
1284
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 memset (itd, 0, sizeof *itd);
1286 itd->itd_dma = itd_dma;
1287 list_add (&itd->itd_list, &sched->td_list);
1288 }
1289 spin_unlock_irqrestore (&ehci->lock, flags);
1290
1291 /* temporarily store schedule info in hcpriv */
1292 urb->hcpriv = sched;
1293 urb->error_count = 0;
1294 return 0;
1295}
1296
1297/*-------------------------------------------------------------------------*/
1298
1299static inline int
1300itd_slot_ok (
1301 struct ehci_hcd *ehci,
1302 u32 mod,
1303 u32 uframe,
1304 u8 usecs,
1305 u32 period
1306)
1307{
1308 uframe %= period;
1309 do {
1310 /* can't commit more than 80% periodic == 100 usec */
1311 if (periodic_usecs (ehci, uframe >> 3, uframe & 0x7)
1312 > (100 - usecs))
1313 return 0;
1314
1315 /* we know urb->interval is 2^N uframes */
1316 uframe += period;
1317 } while (uframe < mod);
1318 return 1;
1319}
1320
1321static inline int
1322sitd_slot_ok (
1323 struct ehci_hcd *ehci,
1324 u32 mod,
1325 struct ehci_iso_stream *stream,
1326 u32 uframe,
1327 struct ehci_iso_sched *sched,
1328 u32 period_uframes
1329)
1330{
1331 u32 mask, tmp;
1332 u32 frame, uf;
1333
1334 mask = stream->raw_mask << (uframe & 7);
1335
1336 /* for IN, don't wrap CSPLIT into the next frame */
1337 if (mask & ~0xffff)
1338 return 0;
1339
1340 /* this multi-pass logic is simple, but performance may
1341 * suffer when the schedule data isn't cached.
1342 */
1343
1344 /* check bandwidth */
1345 uframe %= period_uframes;
1346 do {
1347 u32 max_used;
1348
1349 frame = uframe >> 3;
1350 uf = uframe & 7;
1351
Dan Streetmanba47f662006-05-24 09:39:16 -07001352#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
1353 /* The tt's fullspeed bus bandwidth must be available.
1354 * tt_available scheduling guarantees 10+% for control/bulk.
1355 */
1356 if (!tt_available (ehci, period_uframes << 3,
1357 stream->udev, frame, uf, stream->tt_usecs))
1358 return 0;
1359#else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 /* tt must be idle for start(s), any gap, and csplit.
1361 * assume scheduling slop leaves 10+% for control/bulk.
1362 */
1363 if (!tt_no_collision (ehci, period_uframes << 3,
1364 stream->udev, frame, mask))
1365 return 0;
Dan Streetmanba47f662006-05-24 09:39:16 -07001366#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
1368 /* check starts (OUT uses more than one) */
1369 max_used = 100 - stream->usecs;
1370 for (tmp = stream->raw_mask & 0xff; tmp; tmp >>= 1, uf++) {
1371 if (periodic_usecs (ehci, frame, uf) > max_used)
1372 return 0;
1373 }
1374
1375 /* for IN, check CSPLIT */
1376 if (stream->c_usecs) {
Clemens Ladisch0c734622006-01-22 10:32:49 -08001377 uf = uframe & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 max_used = 100 - stream->c_usecs;
1379 do {
1380 tmp = 1 << uf;
1381 tmp <<= 8;
1382 if ((stream->raw_mask & tmp) == 0)
1383 continue;
1384 if (periodic_usecs (ehci, frame, uf)
1385 > max_used)
1386 return 0;
1387 } while (++uf < 8);
1388 }
1389
1390 /* we know urb->interval is 2^N uframes */
1391 uframe += period_uframes;
1392 } while (uframe < mod);
1393
Stefan Roese6dbd6822007-05-01 09:29:37 -07001394 stream->splits = cpu_to_hc32(ehci, stream->raw_mask << (uframe & 7));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 return 1;
1396}
1397
1398/*
1399 * This scheduler plans almost as far into the future as it has actual
1400 * periodic schedule slots. (Affected by TUNE_FLS, which defaults to
1401 * "as small as possible" to be cache-friendlier.) That limits the size
1402 * transfers you can stream reliably; avoid more than 64 msec per urb.
1403 * Also avoid queue depths of less than ehci's worst irq latency (affected
1404 * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
1405 * and other factors); or more than about 230 msec total (for portability,
1406 * given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler!
1407 */
1408
Sarah Sharpd7e055f2009-10-27 10:54:49 -07001409#define SCHEDULE_SLOP 80 /* microframes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410
1411static int
1412iso_stream_schedule (
1413 struct ehci_hcd *ehci,
1414 struct urb *urb,
1415 struct ehci_iso_stream *stream
1416)
1417{
Alan Sternffda0802010-07-14 11:03:46 -04001418 u32 now, next, start, period, span;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 int status;
1420 unsigned mod = ehci->periodic_size << 3;
1421 struct ehci_iso_sched *sched = urb->hcpriv;
1422
Alan Sternffda0802010-07-14 11:03:46 -04001423 period = urb->interval;
1424 span = sched->span;
1425 if (!stream->highspeed) {
1426 period <<= 3;
1427 span <<= 3;
1428 }
1429
1430 if (span > mod - SCHEDULE_SLOP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 ehci_dbg (ehci, "iso request %p too long\n", urb);
1432 status = -EFBIG;
1433 goto fail;
1434 }
1435
Alan Stern21f25cd2011-10-12 10:39:14 -04001436 now = ehci_read_frame_index(ehci) & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
Alan Sternb40e43f2008-05-20 16:59:10 -04001438 /* Typical case: reuse current schedule, stream is still active.
1439 * Hopefully there are no gaps from the host falling behind
1440 * (irq delays etc), but if there are we'll take the next
1441 * slot in the schedule, implicitly assuming URB_ISO_ASAP.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 */
1443 if (likely (!list_empty (&stream->td_list))) {
Alan Stern1fb2e052010-07-14 11:03:53 -04001444 u32 excess;
Sarah Sharpdccd5742009-10-27 10:55:05 -07001445
1446 /* For high speed devices, allow scheduling within the
Alan Sternae68a832010-07-14 11:03:23 -04001447 * isochronous scheduling threshold. For full speed devices
1448 * and Intel PCI-based controllers, don't (work around for
1449 * Intel ICH9 bug).
Sarah Sharpdccd5742009-10-27 10:55:05 -07001450 */
Alan Sternae68a832010-07-14 11:03:23 -04001451 if (!stream->highspeed && ehci->fs_i_thresh)
Sarah Sharpdccd5742009-10-27 10:55:05 -07001452 next = now + ehci->i_thresh;
1453 else
1454 next = now;
Alan Sternb40e43f2008-05-20 16:59:10 -04001455
Alan Stern1fb2e052010-07-14 11:03:53 -04001456 /* Fell behind (by up to twice the slop amount)?
1457 * We decide based on the time of the last currently-scheduled
1458 * slot, not the time of the next available slot.
1459 */
1460 excess = (stream->next_uframe - period - next) & (mod - 1);
1461 if (excess >= mod - 2 * SCHEDULE_SLOP)
1462 start = next + excess - mod + period *
1463 DIV_ROUND_UP(mod - excess, period);
1464 else
1465 start = next + excess + period;
1466 if (start - now >= mod) {
1467 ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
1468 urb, start - now - period, period,
1469 mod);
Alan Sternb40e43f2008-05-20 16:59:10 -04001470 status = -EFBIG;
1471 goto fail;
1472 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 }
1474
1475 /* need to schedule; when's the next (u)frame we could start?
1476 * this is bigger than ehci->i_thresh allows; scheduling itself
1477 * isn't free, the slop should handle reasonably slow cpus. it
1478 * can also help high bandwidth if the dma and irq loads don't
1479 * jump until after the queue is primed.
1480 */
Alan Stern1fb2e052010-07-14 11:03:53 -04001481 else {
Matthieu CASTET316624d2011-11-28 11:30:22 +01001482 int done = 0;
Alan Stern1fb2e052010-07-14 11:03:53 -04001483 start = SCHEDULE_SLOP + (now & ~0x07);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
Alan Stern1fb2e052010-07-14 11:03:53 -04001485 /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
Thomas Poussevin775b1062011-10-27 18:46:48 +02001487 /* find a uframe slot with enough bandwidth.
1488 * Early uframes are more precious because full-speed
1489 * iso IN transfers can't use late uframes,
1490 * and therefore they should be allocated last.
1491 */
1492 next = start;
1493 start += period;
1494 do {
1495 start--;
Alan Stern1fb2e052010-07-14 11:03:53 -04001496 /* check schedule: enough space? */
1497 if (stream->highspeed) {
1498 if (itd_slot_ok(ehci, mod, start,
1499 stream->usecs, period))
Matthieu CASTET316624d2011-11-28 11:30:22 +01001500 done = 1;
Alan Stern1fb2e052010-07-14 11:03:53 -04001501 } else {
1502 if ((start % 8) >= 6)
1503 continue;
1504 if (sitd_slot_ok(ehci, mod, stream,
1505 start, sched, period))
Matthieu CASTET316624d2011-11-28 11:30:22 +01001506 done = 1;
Alan Stern1fb2e052010-07-14 11:03:53 -04001507 }
Matthieu CASTET316624d2011-11-28 11:30:22 +01001508 } while (start > next && !done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
Alan Stern1fb2e052010-07-14 11:03:53 -04001510 /* no room in the schedule */
Matthieu CASTET316624d2011-11-28 11:30:22 +01001511 if (!done) {
Alan Stern1fb2e052010-07-14 11:03:53 -04001512 ehci_dbg(ehci, "iso resched full %p (now %d max %d)\n",
1513 urb, now, now + mod);
1514 status = -ENOSPC;
1515 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 }
1517 }
1518
Alan Stern1fb2e052010-07-14 11:03:53 -04001519 /* Tried to schedule too far into the future? */
1520 if (unlikely(start - now + span - period
1521 >= mod - 2 * SCHEDULE_SLOP)) {
1522 ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
1523 urb, start - now, span - period,
1524 mod - 2 * SCHEDULE_SLOP);
1525 status = -EFBIG;
1526 goto fail;
1527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
Alan Stern1fb2e052010-07-14 11:03:53 -04001529 stream->next_uframe = start & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 /* report high speed start in uframes; full speed, in frames */
1532 urb->start_frame = stream->next_uframe;
1533 if (!stream->highspeed)
1534 urb->start_frame >>= 3;
1535 return 0;
Alan Stern1fb2e052010-07-14 11:03:53 -04001536
1537 fail:
1538 iso_sched_free(stream, sched);
1539 urb->hcpriv = NULL;
1540 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541}
1542
1543/*-------------------------------------------------------------------------*/
1544
1545static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001546itd_init(struct ehci_hcd *ehci, struct ehci_iso_stream *stream,
1547 struct ehci_itd *itd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548{
1549 int i;
1550
David Brownell77078572005-05-28 10:46:18 -07001551 /* it's been recently zeroed */
Stefan Roese6dbd6822007-05-01 09:29:37 -07001552 itd->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 itd->hw_bufp [0] = stream->buf0;
1554 itd->hw_bufp [1] = stream->buf1;
1555 itd->hw_bufp [2] = stream->buf2;
1556
1557 for (i = 0; i < 8; i++)
1558 itd->index[i] = -1;
1559
1560 /* All other fields are filled when scheduling */
1561}
1562
1563static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001564itd_patch(
1565 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 struct ehci_itd *itd,
1567 struct ehci_iso_sched *iso_sched,
1568 unsigned index,
David Brownell77078572005-05-28 10:46:18 -07001569 u16 uframe
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570)
1571{
1572 struct ehci_iso_packet *uf = &iso_sched->packet [index];
1573 unsigned pg = itd->pg;
1574
1575 // BUG_ON (pg == 6 && uf->cross);
1576
1577 uframe &= 0x07;
1578 itd->index [uframe] = index;
1579
Stefan Roese6dbd6822007-05-01 09:29:37 -07001580 itd->hw_transaction[uframe] = uf->transaction;
1581 itd->hw_transaction[uframe] |= cpu_to_hc32(ehci, pg << 12);
1582 itd->hw_bufp[pg] |= cpu_to_hc32(ehci, uf->bufp & ~(u32)0);
1583 itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(uf->bufp >> 32));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584
1585 /* iso_frame_desc[].offset must be strictly increasing */
David Brownell77078572005-05-28 10:46:18 -07001586 if (unlikely (uf->cross)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 u64 bufp = uf->bufp + 4096;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001588
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 itd->pg = ++pg;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001590 itd->hw_bufp[pg] |= cpu_to_hc32(ehci, bufp & ~(u32)0);
1591 itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(bufp >> 32));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 }
1593}
1594
1595static inline void
1596itd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_itd *itd)
1597{
Clemens Ladisch92bc3642010-03-01 09:12:50 +01001598 union ehci_shadow *prev = &ehci->pshadow[frame];
1599 __hc32 *hw_p = &ehci->periodic[frame];
1600 union ehci_shadow here = *prev;
1601 __hc32 type = 0;
1602
1603 /* skip any iso nodes which might belong to previous microframes */
1604 while (here.ptr) {
1605 type = Q_NEXT_TYPE(ehci, *hw_p);
1606 if (type == cpu_to_hc32(ehci, Q_TYPE_QH))
1607 break;
1608 prev = periodic_next_shadow(ehci, prev, type);
1609 hw_p = shadow_next_periodic(ehci, &here, type);
1610 here = *prev;
1611 }
1612
1613 itd->itd_next = here;
1614 itd->hw_next = *hw_p;
1615 prev->itd = itd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 itd->frame = frame;
1617 wmb ();
Clemens Ladisch92bc3642010-03-01 09:12:50 +01001618 *hw_p = cpu_to_hc32(ehci, itd->itd_dma | Q_TYPE_ITD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619}
1620
1621/* fit urb's itds into the selected schedule slot; activate as needed */
1622static int
1623itd_link_urb (
1624 struct ehci_hcd *ehci,
1625 struct urb *urb,
1626 unsigned mod,
1627 struct ehci_iso_stream *stream
1628)
1629{
David Brownell77078572005-05-28 10:46:18 -07001630 int packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 unsigned next_uframe, uframe, frame;
1632 struct ehci_iso_sched *iso_sched = urb->hcpriv;
1633 struct ehci_itd *itd;
1634
Alan Sternbccbefa2010-07-14 11:03:36 -04001635 next_uframe = stream->next_uframe & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636
1637 if (unlikely (list_empty(&stream->td_list))) {
1638 ehci_to_hcd(ehci)->self.bandwidth_allocated
1639 += stream->bandwidth;
1640 ehci_vdbg (ehci,
1641 "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
1642 urb->dev->devpath, stream->bEndpointAddress & 0x0f,
1643 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
1644 urb->interval,
1645 next_uframe >> 3, next_uframe & 0x7);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 }
Alex He05570292010-12-07 10:10:08 +08001647
1648 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08001649 if (ehci->amd_pll_fix == 1)
1650 usb_amd_quirk_pll_disable();
Alex He05570292010-12-07 10:10:08 +08001651 }
1652
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
1654
1655 /* fill iTDs uframe by uframe */
1656 for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) {
1657 if (itd == NULL) {
1658 /* ASSERT: we have all necessary itds */
1659 // BUG_ON (list_empty (&iso_sched->td_list));
1660
1661 /* ASSERT: no itds for this endpoint in this uframe */
1662
1663 itd = list_entry (iso_sched->td_list.next,
1664 struct ehci_itd, itd_list);
1665 list_move_tail (&itd->itd_list, &stream->td_list);
1666 itd->stream = iso_stream_get (stream);
Karsten Wiese508db8c2009-02-26 01:47:48 +01001667 itd->urb = urb;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001668 itd_init (ehci, stream, itd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 }
1670
1671 uframe = next_uframe & 0x07;
1672 frame = next_uframe >> 3;
1673
Stefan Roese6dbd6822007-05-01 09:29:37 -07001674 itd_patch(ehci, itd, iso_sched, packet, uframe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675
1676 next_uframe += stream->interval;
Alan Sternbccbefa2010-07-14 11:03:36 -04001677 next_uframe &= mod - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678 packet++;
1679
1680 /* link completed itds into the schedule */
1681 if (((next_uframe >> 3) != frame)
1682 || packet == urb->number_of_packets) {
Alan Sternbccbefa2010-07-14 11:03:36 -04001683 itd_link(ehci, frame & (ehci->periodic_size - 1), itd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 itd = NULL;
1685 }
1686 }
1687 stream->next_uframe = next_uframe;
1688
1689 /* don't need that schedule data any more */
1690 iso_sched_free (stream, iso_sched);
1691 urb->hcpriv = NULL;
1692
1693 timer_action (ehci, TIMER_IO_WATCHDOG);
David Brownell01c17142008-08-26 23:35:04 -07001694 return enable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695}
1696
1697#define ISO_ERRS (EHCI_ISOC_BUF_ERR | EHCI_ISOC_BABBLE | EHCI_ISOC_XACTERR)
1698
David Brownell30bf54e2007-12-16 22:37:40 -08001699/* Process and recycle a completed ITD. Return true iff its urb completed,
1700 * and hence its completion callback probably added things to the hardware
1701 * schedule.
1702 *
1703 * Note that we carefully avoid recycling this descriptor until after any
1704 * completion callback runs, so that it won't be reused quickly. That is,
1705 * assuming (a) no more than two urbs per frame on this endpoint, and also
1706 * (b) only this endpoint's completions submit URBs. It seems some silicon
1707 * corrupts things if you reuse completed descriptors very quickly...
1708 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709static unsigned
1710itd_complete (
1711 struct ehci_hcd *ehci,
David Howells7d12e782006-10-05 14:55:46 +01001712 struct ehci_itd *itd
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713) {
1714 struct urb *urb = itd->urb;
1715 struct usb_iso_packet_descriptor *desc;
1716 u32 t;
1717 unsigned uframe;
1718 int urb_index = -1;
1719 struct ehci_iso_stream *stream = itd->stream;
1720 struct usb_device *dev;
David Brownell30bf54e2007-12-16 22:37:40 -08001721 unsigned retval = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722
1723 /* for each uframe with a packet */
1724 for (uframe = 0; uframe < 8; uframe++) {
1725 if (likely (itd->index[uframe] == -1))
1726 continue;
1727 urb_index = itd->index[uframe];
1728 desc = &urb->iso_frame_desc [urb_index];
1729
Stefan Roese6dbd6822007-05-01 09:29:37 -07001730 t = hc32_to_cpup(ehci, &itd->hw_transaction [uframe]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 itd->hw_transaction [uframe] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732
1733 /* report transfer status */
1734 if (unlikely (t & ISO_ERRS)) {
1735 urb->error_count++;
1736 if (t & EHCI_ISOC_BUF_ERR)
1737 desc->status = usb_pipein (urb->pipe)
1738 ? -ENOSR /* hc couldn't read */
1739 : -ECOMM; /* hc couldn't write */
1740 else if (t & EHCI_ISOC_BABBLE)
1741 desc->status = -EOVERFLOW;
1742 else /* (t & EHCI_ISOC_XACTERR) */
1743 desc->status = -EPROTO;
1744
1745 /* HC need not update length with this error */
Alan Sternec6d67e2009-06-29 14:34:59 -04001746 if (!(t & EHCI_ISOC_BABBLE)) {
1747 desc->actual_length = EHCI_ITD_LENGTH(t);
1748 urb->actual_length += desc->actual_length;
1749 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 } else if (likely ((t & EHCI_ISOC_ACTIVE) == 0)) {
1751 desc->status = 0;
Alan Sternec6d67e2009-06-29 14:34:59 -04001752 desc->actual_length = EHCI_ITD_LENGTH(t);
1753 urb->actual_length += desc->actual_length;
Alan Sternb40e43f2008-05-20 16:59:10 -04001754 } else {
1755 /* URB was too late */
1756 desc->status = -EXDEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 }
1758 }
1759
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 /* handle completion now? */
1761 if (likely ((urb_index + 1) != urb->number_of_packets))
David Brownell30bf54e2007-12-16 22:37:40 -08001762 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763
1764 /* ASSERT: it's really the last itd for this urb
1765 list_for_each_entry (itd, &stream->td_list, itd_list)
1766 BUG_ON (itd->urb == urb);
1767 */
1768
David Brownellaa16ca32007-12-30 23:45:19 -08001769 /* give urb back to the driver; completion often (re)submits */
Alan Stern6a8e87b2006-01-19 10:46:27 -05001770 dev = urb->dev;
Alan Stern14c04c02007-08-24 15:40:19 -04001771 ehci_urb_done(ehci, urb, 0);
David Brownell30bf54e2007-12-16 22:37:40 -08001772 retval = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 urb = NULL;
David Brownell01c17142008-08-26 23:35:04 -07001774 (void) disable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
1776
Alex He05570292010-12-07 10:10:08 +08001777 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08001778 if (ehci->amd_pll_fix == 1)
1779 usb_amd_quirk_pll_enable();
Alex He05570292010-12-07 10:10:08 +08001780 }
1781
Karsten Wiese508db8c2009-02-26 01:47:48 +01001782 if (unlikely(list_is_singular(&stream->td_list))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 ehci_to_hcd(ehci)->self.bandwidth_allocated
1784 -= stream->bandwidth;
1785 ehci_vdbg (ehci,
1786 "deschedule devp %s ep%d%s-iso\n",
1787 dev->devpath, stream->bEndpointAddress & 0x0f,
1788 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
1789 }
1790 iso_stream_put (ehci, stream);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08001791
David Brownell30bf54e2007-12-16 22:37:40 -08001792done:
David Brownell30bf54e2007-12-16 22:37:40 -08001793 itd->urb = NULL;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08001794 if (ehci->clock_frame != itd->frame || itd->index[7] != -1) {
1795 /* OK to recycle this ITD now. */
1796 itd->stream = NULL;
1797 list_move(&itd->itd_list, &stream->free_list);
1798 iso_stream_put(ehci, stream);
1799 } else {
1800 /* HW might remember this ITD, so we can't recycle it yet.
1801 * Move it to a safe place until a new frame starts.
1802 */
1803 list_move(&itd->itd_list, &ehci->cached_itd_list);
1804 if (stream->refcount == 2) {
1805 /* If iso_stream_put() were called here, stream
1806 * would be freed. Instead, just prevent reuse.
1807 */
1808 stream->ep->hcpriv = NULL;
1809 stream->ep = NULL;
1810 }
1811 }
David Brownell30bf54e2007-12-16 22:37:40 -08001812 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813}
1814
1815/*-------------------------------------------------------------------------*/
1816
Olav Kongas5db539e2005-06-23 20:25:36 +03001817static int itd_submit (struct ehci_hcd *ehci, struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04001818 gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819{
1820 int status = -EINVAL;
1821 unsigned long flags;
1822 struct ehci_iso_stream *stream;
1823
1824 /* Get iso_stream head */
1825 stream = iso_stream_find (ehci, urb);
1826 if (unlikely (stream == NULL)) {
1827 ehci_dbg (ehci, "can't get iso stream\n");
1828 return -ENOMEM;
1829 }
1830 if (unlikely (urb->interval != stream->interval)) {
1831 ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
1832 stream->interval, urb->interval);
1833 goto done;
1834 }
1835
1836#ifdef EHCI_URB_TRACE
1837 ehci_dbg (ehci,
1838 "%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n",
Harvey Harrison441b62c2008-03-03 16:08:34 -08001839 __func__, urb->dev->devpath, urb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 usb_pipeendpoint (urb->pipe),
1841 usb_pipein (urb->pipe) ? "in" : "out",
1842 urb->transfer_buffer_length,
1843 urb->number_of_packets, urb->interval,
1844 stream);
1845#endif
1846
1847 /* allocate ITDs w/o locking anything */
1848 status = itd_urb_transaction (stream, ehci, urb, mem_flags);
1849 if (unlikely (status < 0)) {
1850 ehci_dbg (ehci, "can't init itds\n");
1851 goto done;
1852 }
1853
1854 /* schedule ... need to lock */
1855 spin_lock_irqsave (&ehci->lock, flags);
Alan Stern541c7d42010-06-22 16:39:10 -04001856 if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +11001857 status = -ESHUTDOWN;
Alan Sterne9df41c2007-08-08 11:48:02 -04001858 goto done_not_linked;
1859 }
1860 status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
1861 if (unlikely(status))
1862 goto done_not_linked;
1863 status = iso_stream_schedule(ehci, urb, stream);
David Brownell53bd6a62006-08-30 14:50:06 -07001864 if (likely (status == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
Alan Sterne9df41c2007-08-08 11:48:02 -04001866 else
1867 usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
1868done_not_linked:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 spin_unlock_irqrestore (&ehci->lock, flags);
1870
1871done:
1872 if (unlikely (status < 0))
1873 iso_stream_put (ehci, stream);
1874 return status;
1875}
1876
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877/*-------------------------------------------------------------------------*/
1878
1879/*
1880 * "Split ISO TDs" ... used for USB 1.1 devices going through the
1881 * TTs in USB 2.0 hubs. These need microframe scheduling.
1882 */
1883
1884static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001885sitd_sched_init(
1886 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 struct ehci_iso_sched *iso_sched,
1888 struct ehci_iso_stream *stream,
1889 struct urb *urb
1890)
1891{
1892 unsigned i;
1893 dma_addr_t dma = urb->transfer_dma;
1894
1895 /* how many frames are needed for these transfers */
1896 iso_sched->span = urb->number_of_packets * stream->interval;
1897
1898 /* figure out per-frame sitd fields that we'll need later
1899 * when we fit new sitds into the schedule.
1900 */
1901 for (i = 0; i < urb->number_of_packets; i++) {
1902 struct ehci_iso_packet *packet = &iso_sched->packet [i];
1903 unsigned length;
1904 dma_addr_t buf;
1905 u32 trans;
1906
1907 length = urb->iso_frame_desc [i].length & 0x03ff;
1908 buf = dma + urb->iso_frame_desc [i].offset;
1909
1910 trans = SITD_STS_ACTIVE;
1911 if (((i + 1) == urb->number_of_packets)
1912 && !(urb->transfer_flags & URB_NO_INTERRUPT))
1913 trans |= SITD_IOC;
1914 trans |= length << 16;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001915 packet->transaction = cpu_to_hc32(ehci, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916
1917 /* might need to cross a buffer page within a td */
1918 packet->bufp = buf;
1919 packet->buf1 = (buf + length) & ~0x0fff;
1920 if (packet->buf1 != (buf & ~(u64)0x0fff))
1921 packet->cross = 1;
1922
David Brownell53bd6a62006-08-30 14:50:06 -07001923 /* OUT uses multiple start-splits */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 if (stream->bEndpointAddress & USB_DIR_IN)
1925 continue;
1926 length = (length + 187) / 188;
1927 if (length > 1) /* BEGIN vs ALL */
1928 length |= 1 << 3;
1929 packet->buf1 |= length;
1930 }
1931}
1932
1933static int
1934sitd_urb_transaction (
1935 struct ehci_iso_stream *stream,
1936 struct ehci_hcd *ehci,
1937 struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04001938 gfp_t mem_flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939)
1940{
1941 struct ehci_sitd *sitd;
1942 dma_addr_t sitd_dma;
1943 int i;
1944 struct ehci_iso_sched *iso_sched;
1945 unsigned long flags;
1946
1947 iso_sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
1948 if (iso_sched == NULL)
1949 return -ENOMEM;
1950
Stefan Roese6dbd6822007-05-01 09:29:37 -07001951 sitd_sched_init(ehci, iso_sched, stream, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952
1953 /* allocate/init sITDs */
1954 spin_lock_irqsave (&ehci->lock, flags);
1955 for (i = 0; i < urb->number_of_packets; i++) {
1956
1957 /* NOTE: for now, we don't try to handle wraparound cases
1958 * for IN (using sitd->hw_backpointer, like a FSTN), which
1959 * means we never need two sitds for full speed packets.
1960 */
1961
1962 /* free_list.next might be cache-hot ... but maybe
1963 * the HC caches it too. avoid that issue for now.
1964 */
1965
1966 /* prefer previously-allocated sitds */
1967 if (!list_empty(&stream->free_list)) {
1968 sitd = list_entry (stream->free_list.prev,
1969 struct ehci_sitd, sitd_list);
1970 list_del (&sitd->sitd_list);
1971 sitd_dma = sitd->sitd_dma;
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001972 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973 spin_unlock_irqrestore (&ehci->lock, flags);
1974 sitd = dma_pool_alloc (ehci->sitd_pool, mem_flags,
1975 &sitd_dma);
1976 spin_lock_irqsave (&ehci->lock, flags);
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001977 if (!sitd) {
1978 iso_sched_free(stream, iso_sched);
1979 spin_unlock_irqrestore(&ehci->lock, flags);
1980 return -ENOMEM;
1981 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 }
1983
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 memset (sitd, 0, sizeof *sitd);
1985 sitd->sitd_dma = sitd_dma;
1986 list_add (&sitd->sitd_list, &iso_sched->td_list);
1987 }
1988
1989 /* temporarily store schedule info in hcpriv */
1990 urb->hcpriv = iso_sched;
1991 urb->error_count = 0;
1992
1993 spin_unlock_irqrestore (&ehci->lock, flags);
1994 return 0;
1995}
1996
1997/*-------------------------------------------------------------------------*/
1998
1999static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07002000sitd_patch(
2001 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002 struct ehci_iso_stream *stream,
2003 struct ehci_sitd *sitd,
2004 struct ehci_iso_sched *iso_sched,
2005 unsigned index
2006)
2007{
2008 struct ehci_iso_packet *uf = &iso_sched->packet [index];
2009 u64 bufp = uf->bufp;
2010
Stefan Roese6dbd6822007-05-01 09:29:37 -07002011 sitd->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012 sitd->hw_fullspeed_ep = stream->address;
2013 sitd->hw_uframe = stream->splits;
2014 sitd->hw_results = uf->transaction;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002015 sitd->hw_backpointer = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016
2017 bufp = uf->bufp;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002018 sitd->hw_buf[0] = cpu_to_hc32(ehci, bufp);
2019 sitd->hw_buf_hi[0] = cpu_to_hc32(ehci, bufp >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020
Stefan Roese6dbd6822007-05-01 09:29:37 -07002021 sitd->hw_buf[1] = cpu_to_hc32(ehci, uf->buf1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 if (uf->cross)
2023 bufp += 4096;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002024 sitd->hw_buf_hi[1] = cpu_to_hc32(ehci, bufp >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 sitd->index = index;
2026}
2027
2028static inline void
2029sitd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_sitd *sitd)
2030{
2031 /* note: sitd ordering could matter (CSPLIT then SSPLIT) */
2032 sitd->sitd_next = ehci->pshadow [frame];
2033 sitd->hw_next = ehci->periodic [frame];
2034 ehci->pshadow [frame].sitd = sitd;
2035 sitd->frame = frame;
2036 wmb ();
Stefan Roese6dbd6822007-05-01 09:29:37 -07002037 ehci->periodic[frame] = cpu_to_hc32(ehci, sitd->sitd_dma | Q_TYPE_SITD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038}
2039
2040/* fit urb's sitds into the selected schedule slot; activate as needed */
2041static int
2042sitd_link_urb (
2043 struct ehci_hcd *ehci,
2044 struct urb *urb,
2045 unsigned mod,
2046 struct ehci_iso_stream *stream
2047)
2048{
2049 int packet;
2050 unsigned next_uframe;
2051 struct ehci_iso_sched *sched = urb->hcpriv;
2052 struct ehci_sitd *sitd;
2053
2054 next_uframe = stream->next_uframe;
2055
2056 if (list_empty(&stream->td_list)) {
2057 /* usbfs ignores TT bandwidth */
2058 ehci_to_hcd(ehci)->self.bandwidth_allocated
2059 += stream->bandwidth;
2060 ehci_vdbg (ehci,
2061 "sched devp %s ep%d%s-iso [%d] %dms/%04x\n",
2062 urb->dev->devpath, stream->bEndpointAddress & 0x0f,
2063 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
Alan Sternbccbefa2010-07-14 11:03:36 -04002064 (next_uframe >> 3) & (ehci->periodic_size - 1),
Stefan Roese6dbd6822007-05-01 09:29:37 -07002065 stream->interval, hc32_to_cpu(ehci, stream->splits));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 }
Alex He05570292010-12-07 10:10:08 +08002067
2068 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08002069 if (ehci->amd_pll_fix == 1)
2070 usb_amd_quirk_pll_disable();
Alex He05570292010-12-07 10:10:08 +08002071 }
2072
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
2074
2075 /* fill sITDs frame by frame */
2076 for (packet = 0, sitd = NULL;
2077 packet < urb->number_of_packets;
2078 packet++) {
2079
2080 /* ASSERT: we have all necessary sitds */
2081 BUG_ON (list_empty (&sched->td_list));
2082
2083 /* ASSERT: no itds for this endpoint in this frame */
2084
2085 sitd = list_entry (sched->td_list.next,
2086 struct ehci_sitd, sitd_list);
2087 list_move_tail (&sitd->sitd_list, &stream->td_list);
2088 sitd->stream = iso_stream_get (stream);
Karsten Wiese508db8c2009-02-26 01:47:48 +01002089 sitd->urb = urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090
Stefan Roese6dbd6822007-05-01 09:29:37 -07002091 sitd_patch(ehci, stream, sitd, sched, packet);
Alan Sternbccbefa2010-07-14 11:03:36 -04002092 sitd_link(ehci, (next_uframe >> 3) & (ehci->periodic_size - 1),
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093 sitd);
2094
2095 next_uframe += stream->interval << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 }
Alan Sternbccbefa2010-07-14 11:03:36 -04002097 stream->next_uframe = next_uframe & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098
2099 /* don't need that schedule data any more */
2100 iso_sched_free (stream, sched);
2101 urb->hcpriv = NULL;
2102
2103 timer_action (ehci, TIMER_IO_WATCHDOG);
David Brownell01c17142008-08-26 23:35:04 -07002104 return enable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105}
2106
2107/*-------------------------------------------------------------------------*/
2108
2109#define SITD_ERRS (SITD_STS_ERR | SITD_STS_DBE | SITD_STS_BABBLE \
David Brownell53bd6a62006-08-30 14:50:06 -07002110 | SITD_STS_XACT | SITD_STS_MMF)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111
David Brownell30bf54e2007-12-16 22:37:40 -08002112/* Process and recycle a completed SITD. Return true iff its urb completed,
2113 * and hence its completion callback probably added things to the hardware
2114 * schedule.
2115 *
2116 * Note that we carefully avoid recycling this descriptor until after any
2117 * completion callback runs, so that it won't be reused quickly. That is,
2118 * assuming (a) no more than two urbs per frame on this endpoint, and also
2119 * (b) only this endpoint's completions submit URBs. It seems some silicon
2120 * corrupts things if you reuse completed descriptors very quickly...
2121 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122static unsigned
2123sitd_complete (
2124 struct ehci_hcd *ehci,
David Howells7d12e782006-10-05 14:55:46 +01002125 struct ehci_sitd *sitd
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126) {
2127 struct urb *urb = sitd->urb;
2128 struct usb_iso_packet_descriptor *desc;
2129 u32 t;
2130 int urb_index = -1;
2131 struct ehci_iso_stream *stream = sitd->stream;
2132 struct usb_device *dev;
David Brownell30bf54e2007-12-16 22:37:40 -08002133 unsigned retval = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134
2135 urb_index = sitd->index;
2136 desc = &urb->iso_frame_desc [urb_index];
Stefan Roese6dbd6822007-05-01 09:29:37 -07002137 t = hc32_to_cpup(ehci, &sitd->hw_results);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138
2139 /* report transfer status */
2140 if (t & SITD_ERRS) {
2141 urb->error_count++;
2142 if (t & SITD_STS_DBE)
2143 desc->status = usb_pipein (urb->pipe)
2144 ? -ENOSR /* hc couldn't read */
2145 : -ECOMM; /* hc couldn't write */
2146 else if (t & SITD_STS_BABBLE)
2147 desc->status = -EOVERFLOW;
2148 else /* XACT, MMF, etc */
2149 desc->status = -EPROTO;
2150 } else {
2151 desc->status = 0;
Alan Sternec6d67e2009-06-29 14:34:59 -04002152 desc->actual_length = desc->length - SITD_LENGTH(t);
2153 urb->actual_length += desc->actual_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155
2156 /* handle completion now? */
2157 if ((urb_index + 1) != urb->number_of_packets)
David Brownell30bf54e2007-12-16 22:37:40 -08002158 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159
2160 /* ASSERT: it's really the last sitd for this urb
2161 list_for_each_entry (sitd, &stream->td_list, sitd_list)
2162 BUG_ON (sitd->urb == urb);
2163 */
2164
David Brownellaa16ca32007-12-30 23:45:19 -08002165 /* give urb back to the driver; completion often (re)submits */
Alan Stern6a8e87b2006-01-19 10:46:27 -05002166 dev = urb->dev;
Alan Stern14c04c02007-08-24 15:40:19 -04002167 ehci_urb_done(ehci, urb, 0);
David Brownell30bf54e2007-12-16 22:37:40 -08002168 retval = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169 urb = NULL;
David Brownell01c17142008-08-26 23:35:04 -07002170 (void) disable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
2172
Alex He05570292010-12-07 10:10:08 +08002173 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08002174 if (ehci->amd_pll_fix == 1)
2175 usb_amd_quirk_pll_enable();
Alex He05570292010-12-07 10:10:08 +08002176 }
2177
Karsten Wiese508db8c2009-02-26 01:47:48 +01002178 if (list_is_singular(&stream->td_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 ehci_to_hcd(ehci)->self.bandwidth_allocated
2180 -= stream->bandwidth;
2181 ehci_vdbg (ehci,
2182 "deschedule devp %s ep%d%s-iso\n",
2183 dev->devpath, stream->bEndpointAddress & 0x0f,
2184 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
2185 }
2186 iso_stream_put (ehci, stream);
Alan Stern0e5f2312010-04-08 16:56:37 -04002187
David Brownell30bf54e2007-12-16 22:37:40 -08002188done:
David Brownell30bf54e2007-12-16 22:37:40 -08002189 sitd->urb = NULL;
Alan Stern0e5f2312010-04-08 16:56:37 -04002190 if (ehci->clock_frame != sitd->frame) {
2191 /* OK to recycle this SITD now. */
2192 sitd->stream = NULL;
2193 list_move(&sitd->sitd_list, &stream->free_list);
2194 iso_stream_put(ehci, stream);
2195 } else {
2196 /* HW might remember this SITD, so we can't recycle it yet.
2197 * Move it to a safe place until a new frame starts.
2198 */
2199 list_move(&sitd->sitd_list, &ehci->cached_sitd_list);
2200 if (stream->refcount == 2) {
2201 /* If iso_stream_put() were called here, stream
2202 * would be freed. Instead, just prevent reuse.
2203 */
2204 stream->ep->hcpriv = NULL;
2205 stream->ep = NULL;
2206 }
2207 }
David Brownell30bf54e2007-12-16 22:37:40 -08002208 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209}
2210
2211
Olav Kongas5db539e2005-06-23 20:25:36 +03002212static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04002213 gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214{
2215 int status = -EINVAL;
2216 unsigned long flags;
2217 struct ehci_iso_stream *stream;
2218
2219 /* Get iso_stream head */
2220 stream = iso_stream_find (ehci, urb);
2221 if (stream == NULL) {
2222 ehci_dbg (ehci, "can't get iso stream\n");
2223 return -ENOMEM;
2224 }
2225 if (urb->interval != stream->interval) {
2226 ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
2227 stream->interval, urb->interval);
2228 goto done;
2229 }
2230
2231#ifdef EHCI_URB_TRACE
2232 ehci_dbg (ehci,
2233 "submit %p dev%s ep%d%s-iso len %d\n",
2234 urb, urb->dev->devpath,
2235 usb_pipeendpoint (urb->pipe),
2236 usb_pipein (urb->pipe) ? "in" : "out",
2237 urb->transfer_buffer_length);
2238#endif
2239
2240 /* allocate SITDs */
2241 status = sitd_urb_transaction (stream, ehci, urb, mem_flags);
2242 if (status < 0) {
2243 ehci_dbg (ehci, "can't init sitds\n");
2244 goto done;
2245 }
2246
2247 /* schedule ... need to lock */
2248 spin_lock_irqsave (&ehci->lock, flags);
Alan Stern541c7d42010-06-22 16:39:10 -04002249 if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +11002250 status = -ESHUTDOWN;
Alan Sterne9df41c2007-08-08 11:48:02 -04002251 goto done_not_linked;
2252 }
2253 status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
2254 if (unlikely(status))
2255 goto done_not_linked;
2256 status = iso_stream_schedule(ehci, urb, stream);
David Brownell53bd6a62006-08-30 14:50:06 -07002257 if (status == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258 sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
Alan Sterne9df41c2007-08-08 11:48:02 -04002259 else
2260 usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
2261done_not_linked:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 spin_unlock_irqrestore (&ehci->lock, flags);
2263
2264done:
2265 if (status < 0)
2266 iso_stream_put (ehci, stream);
2267 return status;
2268}
2269
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270/*-------------------------------------------------------------------------*/
2271
Alan Stern0e5f2312010-04-08 16:56:37 -04002272static void free_cached_lists(struct ehci_hcd *ehci)
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002273{
2274 struct ehci_itd *itd, *n;
Alan Stern0e5f2312010-04-08 16:56:37 -04002275 struct ehci_sitd *sitd, *sn;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002276
2277 list_for_each_entry_safe(itd, n, &ehci->cached_itd_list, itd_list) {
2278 struct ehci_iso_stream *stream = itd->stream;
2279 itd->stream = NULL;
2280 list_move(&itd->itd_list, &stream->free_list);
2281 iso_stream_put(ehci, stream);
2282 }
Alan Stern0e5f2312010-04-08 16:56:37 -04002283
2284 list_for_each_entry_safe(sitd, sn, &ehci->cached_sitd_list, sitd_list) {
2285 struct ehci_iso_stream *stream = sitd->stream;
2286 sitd->stream = NULL;
2287 list_move(&sitd->sitd_list, &stream->free_list);
2288 iso_stream_put(ehci, stream);
2289 }
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002290}
2291
2292/*-------------------------------------------------------------------------*/
2293
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294static void
David Howells7d12e782006-10-05 14:55:46 +01002295scan_periodic (struct ehci_hcd *ehci)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002296{
Alan Sternb40e43f2008-05-20 16:59:10 -04002297 unsigned now_uframe, frame, clock, clock_frame, mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298 unsigned modified;
2299
2300 mod = ehci->periodic_size << 3;
2301
2302 /*
2303 * When running, scan from last scan point up to "now"
2304 * else clean up by scanning everything that's left.
2305 * Touches as few pages as possible: cache-friendly.
2306 */
2307 now_uframe = ehci->next_uframe;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002308 if (HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
Alan Stern21f25cd2011-10-12 10:39:14 -04002309 clock = ehci_read_frame_index(ehci);
Alan Sternbccbefa2010-07-14 11:03:36 -04002310 clock_frame = (clock >> 3) & (ehci->periodic_size - 1);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002311 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 clock = now_uframe + mod - 1;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002313 clock_frame = -1;
2314 }
2315 if (ehci->clock_frame != clock_frame) {
Alan Stern0e5f2312010-04-08 16:56:37 -04002316 free_cached_lists(ehci);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002317 ehci->clock_frame = clock_frame;
2318 }
Alan Sternbccbefa2010-07-14 11:03:36 -04002319 clock &= mod - 1;
Alan Sternb40e43f2008-05-20 16:59:10 -04002320 clock_frame = clock >> 3;
Alan Stern1e12c912011-05-17 10:40:51 -04002321 ++ehci->periodic_stamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322
2323 for (;;) {
2324 union ehci_shadow q, *q_p;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002325 __hc32 type, *hw_p;
David Brownell79592b722008-01-07 00:47:42 -08002326 unsigned incomplete = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 frame = now_uframe >> 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329
2330restart:
2331 /* scan each element in frame's queue for completions */
2332 q_p = &ehci->pshadow [frame];
2333 hw_p = &ehci->periodic [frame];
2334 q.ptr = q_p->ptr;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002335 type = Q_NEXT_TYPE(ehci, *hw_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002336 modified = 0;
2337
2338 while (q.ptr != NULL) {
2339 unsigned uf;
2340 union ehci_shadow temp;
2341 int live;
2342
2343 live = HC_IS_RUNNING (ehci_to_hcd(ehci)->state);
Stefan Roese6dbd6822007-05-01 09:29:37 -07002344 switch (hc32_to_cpu(ehci, type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 case Q_TYPE_QH:
2346 /* handle any completions */
2347 temp.qh = qh_get (q.qh);
Alek Du3807e262009-07-14 07:23:29 +08002348 type = Q_NEXT_TYPE(ehci, q.qh->hw->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349 q = q.qh->qh_next;
Alan Stern1e12c912011-05-17 10:40:51 -04002350 if (temp.qh->stamp != ehci->periodic_stamp) {
2351 modified = qh_completions(ehci, temp.qh);
2352 if (!modified)
2353 temp.qh->stamp = ehci->periodic_stamp;
2354 if (unlikely(list_empty(&temp.qh->qtd_list) ||
2355 temp.qh->needs_rescan))
2356 intr_deschedule(ehci, temp.qh);
2357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 qh_put (temp.qh);
2359 break;
2360 case Q_TYPE_FSTN:
2361 /* for "save place" FSTNs, look at QH entries
2362 * in the previous frame for completions.
2363 */
Stefan Roese6dbd6822007-05-01 09:29:37 -07002364 if (q.fstn->hw_prev != EHCI_LIST_END(ehci)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365 dbg ("ignoring completions from FSTNs");
2366 }
Stefan Roese6dbd6822007-05-01 09:29:37 -07002367 type = Q_NEXT_TYPE(ehci, q.fstn->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368 q = q.fstn->fstn_next;
2369 break;
2370 case Q_TYPE_ITD:
David Brownell79592b722008-01-07 00:47:42 -08002371 /* If this ITD is still active, leave it for
2372 * later processing ... check the next entry.
Alan Sternb40e43f2008-05-20 16:59:10 -04002373 * No need to check for activity unless the
2374 * frame is current.
David Brownell79592b722008-01-07 00:47:42 -08002375 */
Alan Sternb40e43f2008-05-20 16:59:10 -04002376 if (frame == clock_frame && live) {
2377 rmb();
2378 for (uf = 0; uf < 8; uf++) {
2379 if (q.itd->hw_transaction[uf] &
2380 ITD_ACTIVE(ehci))
2381 break;
2382 }
2383 if (uf < 8) {
2384 incomplete = true;
2385 q_p = &q.itd->itd_next;
2386 hw_p = &q.itd->hw_next;
2387 type = Q_NEXT_TYPE(ehci,
Stefan Roese6dbd6822007-05-01 09:29:37 -07002388 q.itd->hw_next);
Alan Sternb40e43f2008-05-20 16:59:10 -04002389 q = *q_p;
2390 break;
2391 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393
David Brownell79592b722008-01-07 00:47:42 -08002394 /* Take finished ITDs out of the schedule
2395 * and process them: recycle, maybe report
2396 * URB completion. HC won't cache the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002397 * pointer for much longer, if at all.
2398 */
2399 *q_p = q.itd->itd_next;
Andiry Xu3d091a62010-11-08 17:58:35 +08002400 if (!ehci->use_dummy_qh ||
2401 q.itd->hw_next != EHCI_LIST_END(ehci))
2402 *hw_p = q.itd->hw_next;
2403 else
2404 *hw_p = ehci->dummy->qh_dma;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002405 type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406 wmb();
David Howells7d12e782006-10-05 14:55:46 +01002407 modified = itd_complete (ehci, q.itd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002408 q = *q_p;
2409 break;
2410 case Q_TYPE_SITD:
David Brownell79592b722008-01-07 00:47:42 -08002411 /* If this SITD is still active, leave it for
2412 * later processing ... check the next entry.
Alan Sternb40e43f2008-05-20 16:59:10 -04002413 * No need to check for activity unless the
2414 * frame is current.
David Brownell79592b722008-01-07 00:47:42 -08002415 */
Dmitri Epshtein22e18692009-12-14 17:17:34 +02002416 if (((frame == clock_frame) ||
Alan Sternbccbefa2010-07-14 11:03:36 -04002417 (((frame + 1) & (ehci->periodic_size - 1))
Dmitri Epshtein22e18692009-12-14 17:17:34 +02002418 == clock_frame))
2419 && live
2420 && (q.sitd->hw_results &
2421 SITD_ACTIVE(ehci))) {
2422
David Brownell79592b722008-01-07 00:47:42 -08002423 incomplete = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002424 q_p = &q.sitd->sitd_next;
2425 hw_p = &q.sitd->hw_next;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002426 type = Q_NEXT_TYPE(ehci,
2427 q.sitd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 q = *q_p;
2429 break;
2430 }
David Brownell79592b722008-01-07 00:47:42 -08002431
2432 /* Take finished SITDs out of the schedule
2433 * and process them: recycle, maybe report
2434 * URB completion.
2435 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 *q_p = q.sitd->sitd_next;
Andiry Xu3d091a62010-11-08 17:58:35 +08002437 if (!ehci->use_dummy_qh ||
2438 q.sitd->hw_next != EHCI_LIST_END(ehci))
2439 *hw_p = q.sitd->hw_next;
2440 else
2441 *hw_p = ehci->dummy->qh_dma;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002442 type = Q_NEXT_TYPE(ehci, q.sitd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443 wmb();
David Howells7d12e782006-10-05 14:55:46 +01002444 modified = sitd_complete (ehci, q.sitd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445 q = *q_p;
2446 break;
2447 default:
2448 dbg ("corrupt type %d frame %d shadow %p",
2449 type, frame, q.ptr);
2450 // BUG ();
2451 q.ptr = NULL;
2452 }
2453
2454 /* assume completion callbacks modify the queue */
David Brownellaa16ca32007-12-30 23:45:19 -08002455 if (unlikely (modified)) {
2456 if (likely(ehci->periodic_sched > 0))
2457 goto restart;
David Brownell01c17142008-08-26 23:35:04 -07002458 /* short-circuit this scan */
David Brownellaa16ca32007-12-30 23:45:19 -08002459 now_uframe = clock;
2460 break;
2461 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462 }
2463
David Brownell79592b722008-01-07 00:47:42 -08002464 /* If we can tell we caught up to the hardware, stop now.
2465 * We can't advance our scan without collecting the ISO
2466 * transfers that are still pending in this frame.
2467 */
2468 if (incomplete && HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
2469 ehci->next_uframe = now_uframe;
2470 break;
2471 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002472
2473 // FIXME: this assumes we won't get lapped when
2474 // latencies climb; that should be rare, but...
2475 // detect it, and just go all the way around.
2476 // FLR might help detect this case, so long as latencies
2477 // don't exceed periodic_size msec (default 1.024 sec).
2478
2479 // FIXME: likewise assumes HC doesn't halt mid-scan
2480
2481 if (now_uframe == clock) {
2482 unsigned now;
2483
David Brownellaa16ca32007-12-30 23:45:19 -08002484 if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state)
2485 || ehci->periodic_sched == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486 break;
2487 ehci->next_uframe = now_uframe;
Alan Stern21f25cd2011-10-12 10:39:14 -04002488 now = ehci_read_frame_index(ehci) & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 if (now_uframe == now)
2490 break;
2491
2492 /* rescan the rest of this frame, then ... */
2493 clock = now;
Alan Sternb40e43f2008-05-20 16:59:10 -04002494 clock_frame = clock >> 3;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002495 if (ehci->clock_frame != clock_frame) {
Alan Stern0e5f2312010-04-08 16:56:37 -04002496 free_cached_lists(ehci);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002497 ehci->clock_frame = clock_frame;
Alan Stern1e12c912011-05-17 10:40:51 -04002498 ++ehci->periodic_stamp;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002499 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500 } else {
2501 now_uframe++;
Alan Sternbccbefa2010-07-14 11:03:36 -04002502 now_uframe &= mod - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 }
David Brownell53bd6a62006-08-30 14:50:06 -07002504 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002505}