blob: 56a32033adb3485db49484d23619d1f2dcf68071 [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 Stern68aa95d2011-10-12 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
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400196 if (usecs > ehci->uframe_periodic_max)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 /* make sure ehci_work scans these */
Alan Stern68aa95d2011-10-12 10:39:14 -0400505 ehci->next_uframe = ehci_read_frame_index(ehci)
Benjamin Herrenschmidt083522d2006-12-15 06:54:08 +1100506 % (ehci->periodic_size << 3);
Oliver Neukumee4ecb82009-11-27 15:17:59 +0100507 if (unlikely(ehci->broken_periodic))
508 ehci->last_periodic_enable = ktime_get_real();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 return 0;
510}
511
512static int disable_periodic (struct ehci_hcd *ehci)
513{
514 u32 cmd;
515 int status;
516
David Brownell01c17142008-08-26 23:35:04 -0700517 if (--ehci->periodic_sched)
518 return 0;
519
Oliver Neukumee4ecb82009-11-27 15:17:59 +0100520 if (unlikely(ehci->broken_periodic)) {
521 /* delay experimentally determined */
522 ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
523 ktime_t now = ktime_get_real();
524 s64 delay = ktime_us_delta(safe, now);
525
526 if (unlikely(delay > 0))
527 udelay(delay);
528 }
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 /* did setting PSE not take effect yet?
531 * takes effect only at frame boundaries...
532 */
Karsten Wiesec765d4c2008-02-16 13:44:42 -0800533 status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
534 STS_PSS, STS_PSS, 9 * 125);
Alan Stern69fff592011-05-17 17:27:12 -0400535 if (status) {
536 usb_hc_died(ehci_to_hcd(ehci));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 return status;
Alan Stern69fff592011-05-17 17:27:12 -0400538 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
Benjamin Herrenschmidt083522d2006-12-15 06:54:08 +1100540 cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE;
541 ehci_writel(ehci, cmd, &ehci->regs->command);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 /* posted write ... */
543
Alan Stern0e5f2312010-04-08 16:56:37 -0400544 free_cached_lists(ehci);
Dmitri Epshteind63c66d2009-12-14 17:17:33 +0200545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 ehci->next_uframe = -1;
547 return 0;
548}
549
550/*-------------------------------------------------------------------------*/
551
552/* periodic schedule slots have iso tds (normal or split) first, then a
553 * sparse tree for active interrupt transfers.
554 *
555 * this just links in a qh; caller guarantees uframe masks are set right.
556 * no FSTN support (yet; ehci 0.96+)
557 */
558static int qh_link_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh)
559{
560 unsigned i;
561 unsigned period = qh->period;
562
563 dev_dbg (&qh->dev->dev,
564 "link qh%d-%04x/%p start %d [%d/%d us]\n",
Alek Du3807e262009-07-14 07:23:29 +0800565 period, hc32_to_cpup(ehci, &qh->hw->hw_info2)
566 & (QH_CMASK | QH_SMASK),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 qh, qh->start, qh->usecs, qh->c_usecs);
568
569 /* high bandwidth, or otherwise every microframe */
570 if (period == 0)
571 period = 1;
572
573 for (i = qh->start; i < ehci->periodic_size; i += period) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700574 union ehci_shadow *prev = &ehci->pshadow[i];
575 __hc32 *hw_p = &ehci->periodic[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 union ehci_shadow here = *prev;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700577 __hc32 type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 /* skip the iso nodes at list head */
580 while (here.ptr) {
Stefan Roese6dbd6822007-05-01 09:29:37 -0700581 type = Q_NEXT_TYPE(ehci, *hw_p);
582 if (type == cpu_to_hc32(ehci, Q_TYPE_QH))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 break;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700584 prev = periodic_next_shadow(ehci, prev, type);
Alek Du3807e262009-07-14 07:23:29 +0800585 hw_p = shadow_next_periodic(ehci, &here, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 here = *prev;
587 }
588
589 /* sorting each branch by period (slow-->fast)
590 * enables sharing interior tree nodes
591 */
592 while (here.ptr && qh != here.qh) {
593 if (qh->period > here.qh->period)
594 break;
595 prev = &here.qh->qh_next;
Alek Du3807e262009-07-14 07:23:29 +0800596 hw_p = &here.qh->hw->hw_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 here = *prev;
598 }
599 /* link in this qh, unless some earlier pass did that */
600 if (qh != here.qh) {
601 qh->qh_next = here;
602 if (here.qh)
Alek Du3807e262009-07-14 07:23:29 +0800603 qh->hw->hw_next = *hw_p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 wmb ();
605 prev->qh = qh;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700606 *hw_p = QH_NEXT (ehci, qh->qh_dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 }
608 }
609 qh->qh_state = QH_STATE_LINKED;
Alan Sternef4638f2009-07-31 10:41:40 -0400610 qh->xacterrs = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 qh_get (qh);
612
613 /* update per-qh bandwidth for usbfs */
614 ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period
615 ? ((qh->usecs + qh->c_usecs) / qh->period)
616 : (qh->usecs * 8);
617
618 /* maybe enable periodic schedule processing */
David Brownell01c17142008-08-26 23:35:04 -0700619 return enable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620}
621
David Brownell01c17142008-08-26 23:35:04 -0700622static int qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623{
624 unsigned i;
625 unsigned period;
626
627 // FIXME:
628 // IF this isn't high speed
629 // and this qh is active in the current uframe
630 // (and overlay token SplitXstate is false?)
631 // THEN
Harvey Harrison551509d2009-02-11 14:11:36 -0800632 // qh->hw_info1 |= cpu_to_hc32(1 << 7 /* "ignore" */);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 /* high bandwidth, or otherwise part of every microframe */
635 if ((period = qh->period) == 0)
636 period = 1;
637
638 for (i = qh->start; i < ehci->periodic_size; i += period)
639 periodic_unlink (ehci, i, qh);
640
641 /* update per-qh bandwidth for usbfs */
642 ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->period
643 ? ((qh->usecs + qh->c_usecs) / qh->period)
644 : (qh->usecs * 8);
645
646 dev_dbg (&qh->dev->dev,
647 "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
David Brownell7dedacf2005-08-04 18:06:41 -0700648 qh->period,
Alek Du3807e262009-07-14 07:23:29 +0800649 hc32_to_cpup(ehci, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 qh, qh->start, qh->usecs, qh->c_usecs);
651
652 /* qh->qh_next still "live" to HC */
653 qh->qh_state = QH_STATE_UNLINK;
654 qh->qh_next.ptr = NULL;
655 qh_put (qh);
656
657 /* maybe turn off periodic schedule */
David Brownell01c17142008-08-26 23:35:04 -0700658 return disable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
660
661static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh)
662{
Alan Sterna448c9d2009-08-19 12:22:44 -0400663 unsigned wait;
664 struct ehci_qh_hw *hw = qh->hw;
665 int rc;
666
667 /* If the QH isn't linked then there's nothing we can do
668 * unless we were called during a giveback, in which case
669 * qh_completions() has to deal with it.
670 */
671 if (qh->qh_state != QH_STATE_LINKED) {
672 if (qh->qh_state == QH_STATE_COMPLETING)
673 qh->needs_rescan = 1;
674 return;
675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
677 qh_unlink_periodic (ehci, qh);
678
679 /* simple/paranoid: always delay, expecting the HC needs to read
680 * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
681 * expect khubd to clean up after any CSPLITs we won't issue.
682 * active high speed queues may need bigger delays...
683 */
684 if (list_empty (&qh->qtd_list)
Stefan Roese6dbd6822007-05-01 09:29:37 -0700685 || (cpu_to_hc32(ehci, QH_CMASK)
Alek Du3807e262009-07-14 07:23:29 +0800686 & hw->hw_info2) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 wait = 2;
688 else
689 wait = 55; /* worst case: 3 * 1024 */
690
691 udelay (wait);
692 qh->qh_state = QH_STATE_IDLE;
Alek Du3807e262009-07-14 07:23:29 +0800693 hw->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 wmb ();
Alan Sterna448c9d2009-08-19 12:22:44 -0400695
696 qh_completions(ehci, qh);
697
698 /* reschedule QH iff another request is queued */
699 if (!list_empty(&qh->qtd_list) &&
Alan Sterne8799902011-08-18 16:31:30 -0400700 ehci->rh_state == EHCI_RH_RUNNING) {
Alan Sterna448c9d2009-08-19 12:22:44 -0400701 rc = qh_schedule(ehci, qh);
702
703 /* An error here likely indicates handshake failure
704 * or no space left in the schedule. Neither fault
705 * should happen often ...
706 *
707 * FIXME kill the now-dysfunctional queued urbs
708 */
709 if (rc != 0)
710 ehci_err(ehci, "can't reschedule qh %p, err %d\n",
711 qh, rc);
712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713}
714
715/*-------------------------------------------------------------------------*/
716
717static int check_period (
David Brownell53bd6a62006-08-30 14:50:06 -0700718 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 unsigned frame,
720 unsigned uframe,
721 unsigned period,
722 unsigned usecs
723) {
724 int claimed;
725
726 /* complete split running into next frame?
727 * given FSTN support, we could sometimes check...
728 */
729 if (uframe >= 8)
730 return 0;
731
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400732 /* convert "usecs we need" to "max already claimed" */
733 usecs = ehci->uframe_periodic_max - usecs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 /* we "know" 2 and 4 uframe intervals were rejected; so
736 * for period 0, check _every_ microframe in the schedule.
737 */
738 if (unlikely (period == 0)) {
739 do {
740 for (uframe = 0; uframe < 7; uframe++) {
741 claimed = periodic_usecs (ehci, frame, uframe);
742 if (claimed > usecs)
743 return 0;
744 }
745 } while ((frame += 1) < ehci->periodic_size);
746
747 /* just check the specified uframe, at that period */
748 } else {
749 do {
750 claimed = periodic_usecs (ehci, frame, uframe);
751 if (claimed > usecs)
752 return 0;
753 } while ((frame += period) < ehci->periodic_size);
754 }
755
756 // success!
757 return 1;
758}
759
760static int check_intr_schedule (
David Brownell53bd6a62006-08-30 14:50:06 -0700761 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 unsigned frame,
763 unsigned uframe,
764 const struct ehci_qh *qh,
Stefan Roese6dbd6822007-05-01 09:29:37 -0700765 __hc32 *c_maskp
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766)
767{
David Brownell53bd6a62006-08-30 14:50:06 -0700768 int retval = -ENOSPC;
Dan Streetmanba47f662006-05-24 09:39:16 -0700769 u8 mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771 if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
772 goto done;
773
774 if (!check_period (ehci, frame, uframe, qh->period, qh->usecs))
775 goto done;
776 if (!qh->c_usecs) {
777 retval = 0;
778 *c_maskp = 0;
779 goto done;
780 }
781
Dan Streetmanba47f662006-05-24 09:39:16 -0700782#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
783 if (tt_available (ehci, qh->period, qh->dev, frame, uframe,
784 qh->tt_usecs)) {
785 unsigned i;
786
787 /* TODO : this may need FSTN for SSPLIT in uframe 5. */
788 for (i=uframe+1; i<8 && i<uframe+4; i++)
789 if (!check_period (ehci, frame, i,
790 qh->period, qh->c_usecs))
791 goto done;
792 else
793 mask |= 1 << i;
794
795 retval = 0;
796
Stefan Roese6dbd6822007-05-01 09:29:37 -0700797 *c_maskp = cpu_to_hc32(ehci, mask << 8);
Dan Streetmanba47f662006-05-24 09:39:16 -0700798 }
799#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 /* Make sure this tt's buffer is also available for CSPLITs.
801 * We pessimize a bit; probably the typical full speed case
802 * doesn't need the second CSPLIT.
David Brownell53bd6a62006-08-30 14:50:06 -0700803 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 * NOTE: both SPLIT and CSPLIT could be checked in just
805 * one smart pass...
806 */
807 mask = 0x03 << (uframe + qh->gap_uf);
Stefan Roese6dbd6822007-05-01 09:29:37 -0700808 *c_maskp = cpu_to_hc32(ehci, mask << 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 mask |= 1 << uframe;
811 if (tt_no_collision (ehci, qh->period, qh->dev, frame, mask)) {
812 if (!check_period (ehci, frame, uframe + qh->gap_uf + 1,
813 qh->period, qh->c_usecs))
814 goto done;
815 if (!check_period (ehci, frame, uframe + qh->gap_uf,
816 qh->period, qh->c_usecs))
817 goto done;
818 retval = 0;
819 }
Dan Streetmanba47f662006-05-24 09:39:16 -0700820#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821done:
822 return retval;
823}
824
825/* "first fit" scheduling policy used the first time through,
826 * or when the previous schedule slot can't be re-used.
827 */
Stefan Roese6dbd6822007-05-01 09:29:37 -0700828static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829{
David Brownell53bd6a62006-08-30 14:50:06 -0700830 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 unsigned uframe;
Stefan Roese6dbd6822007-05-01 09:29:37 -0700832 __hc32 c_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
Alek Du3807e262009-07-14 07:23:29 +0800834 struct ehci_qh_hw *hw = qh->hw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
836 qh_refresh(ehci, qh);
Alek Du3807e262009-07-14 07:23:29 +0800837 hw->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 frame = qh->start;
839
840 /* reuse the previous schedule slots, if we can */
841 if (frame < qh->period) {
Alek Du3807e262009-07-14 07:23:29 +0800842 uframe = ffs(hc32_to_cpup(ehci, &hw->hw_info2) & QH_SMASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 status = check_intr_schedule (ehci, frame, --uframe,
844 qh, &c_mask);
845 } else {
846 uframe = 0;
847 c_mask = 0;
848 status = -ENOSPC;
849 }
850
851 /* else scan the schedule to find a group of slots such that all
852 * uframes have enough periodic bandwidth available.
853 */
854 if (status) {
855 /* "normal" case, uframing flexible except with splits */
856 if (qh->period) {
Alan Stern68335e82009-05-22 17:02:33 -0400857 int i;
858
859 for (i = qh->period; status && i > 0; --i) {
860 frame = ++ehci->random_frame % qh->period;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 for (uframe = 0; uframe < 8; uframe++) {
862 status = check_intr_schedule (ehci,
863 frame, uframe, qh,
864 &c_mask);
865 if (status == 0)
866 break;
867 }
Alan Stern68335e82009-05-22 17:02:33 -0400868 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
870 /* qh->period == 0 means every uframe */
871 } else {
872 frame = 0;
873 status = check_intr_schedule (ehci, 0, 0, qh, &c_mask);
874 }
875 if (status)
876 goto done;
877 qh->start = frame;
878
879 /* reset S-frame and (maybe) C-frame masks */
Alek Du3807e262009-07-14 07:23:29 +0800880 hw->hw_info2 &= cpu_to_hc32(ehci, ~(QH_CMASK | QH_SMASK));
881 hw->hw_info2 |= qh->period
Stefan Roese6dbd6822007-05-01 09:29:37 -0700882 ? cpu_to_hc32(ehci, 1 << uframe)
883 : cpu_to_hc32(ehci, QH_SMASK);
Alek Du3807e262009-07-14 07:23:29 +0800884 hw->hw_info2 |= c_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 } else
886 ehci_dbg (ehci, "reused qh %p schedule\n", qh);
887
888 /* stuff into the periodic schedule */
David Brownell53bd6a62006-08-30 14:50:06 -0700889 status = qh_link_periodic (ehci, qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890done:
891 return status;
892}
893
894static int intr_submit (
895 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 struct urb *urb,
897 struct list_head *qtd_list,
Al Viro55016f12005-10-21 03:21:58 -0400898 gfp_t mem_flags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899) {
900 unsigned epnum;
901 unsigned long flags;
902 struct ehci_qh *qh;
Alan Sterne9df41c2007-08-08 11:48:02 -0400903 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 struct list_head empty;
905
906 /* get endpoint and transfer/schedule data */
Alan Sterne9df41c2007-08-08 11:48:02 -0400907 epnum = urb->ep->desc.bEndpointAddress;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
909 spin_lock_irqsave (&ehci->lock, flags);
910
Alan Stern541c7d42010-06-22 16:39:10 -0400911 if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +1100912 status = -ESHUTDOWN;
Alan Sterne9df41c2007-08-08 11:48:02 -0400913 goto done_not_linked;
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +1100914 }
Alan Sterne9df41c2007-08-08 11:48:02 -0400915 status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
916 if (unlikely(status))
917 goto done_not_linked;
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +1100918
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 /* get qh and force any scheduling errors */
920 INIT_LIST_HEAD (&empty);
Alan Sterne9df41c2007-08-08 11:48:02 -0400921 qh = qh_append_tds(ehci, urb, &empty, epnum, &urb->ep->hcpriv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 if (qh == NULL) {
923 status = -ENOMEM;
924 goto done;
925 }
926 if (qh->qh_state == QH_STATE_IDLE) {
927 if ((status = qh_schedule (ehci, qh)) != 0)
928 goto done;
929 }
930
931 /* then queue the urb's tds to the qh */
Alan Sterne9df41c2007-08-08 11:48:02 -0400932 qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 BUG_ON (qh == NULL);
934
935 /* ... update usbfs periodic stats */
936 ehci_to_hcd(ehci)->self.bandwidth_int_reqs++;
937
938done:
Alan Sterne9df41c2007-08-08 11:48:02 -0400939 if (unlikely(status))
940 usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
941done_not_linked:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 spin_unlock_irqrestore (&ehci->lock, flags);
943 if (status)
944 qtd_list_free (ehci, urb, qtd_list);
945
946 return status;
947}
948
949/*-------------------------------------------------------------------------*/
950
951/* ehci_iso_stream ops work with both ITD and SITD */
952
953static struct ehci_iso_stream *
Al Viro55016f12005-10-21 03:21:58 -0400954iso_stream_alloc (gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955{
956 struct ehci_iso_stream *stream;
957
Pekka Enberg7b842b62005-09-06 15:18:34 -0700958 stream = kzalloc(sizeof *stream, mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 if (likely (stream != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 INIT_LIST_HEAD(&stream->td_list);
961 INIT_LIST_HEAD(&stream->free_list);
962 stream->next_uframe = -1;
963 stream->refcount = 1;
964 }
965 return stream;
966}
967
968static void
969iso_stream_init (
970 struct ehci_hcd *ehci,
971 struct ehci_iso_stream *stream,
972 struct usb_device *dev,
973 int pipe,
974 unsigned interval
975)
976{
977 static const u8 smask_out [] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f };
978
979 u32 buf1;
980 unsigned epnum, maxp;
981 int is_input;
982 long bandwidth;
983
984 /*
985 * this might be a "high bandwidth" highspeed endpoint,
986 * as encoded in the ep descriptor's wMaxPacket field
987 */
988 epnum = usb_pipeendpoint (pipe);
989 is_input = usb_pipein (pipe) ? USB_DIR_IN : 0;
990 maxp = usb_maxpacket(dev, pipe, !is_input);
991 if (is_input) {
992 buf1 = (1 << 11);
993 } else {
994 buf1 = 0;
995 }
996
997 /* knows about ITD vs SITD */
998 if (dev->speed == USB_SPEED_HIGH) {
999 unsigned multi = hb_mult(maxp);
1000
1001 stream->highspeed = 1;
1002
1003 maxp = max_packet(maxp);
1004 buf1 |= maxp;
1005 maxp *= multi;
1006
Stefan Roese6dbd6822007-05-01 09:29:37 -07001007 stream->buf0 = cpu_to_hc32(ehci, (epnum << 8) | dev->devnum);
1008 stream->buf1 = cpu_to_hc32(ehci, buf1);
1009 stream->buf2 = cpu_to_hc32(ehci, multi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
1011 /* usbfs wants to report the average usecs per frame tied up
1012 * when transfers on this endpoint are scheduled ...
1013 */
1014 stream->usecs = HS_USECS_ISO (maxp);
1015 bandwidth = stream->usecs * 8;
Alan Stern372dd6e2008-11-12 17:02:57 -05001016 bandwidth /= interval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
1018 } else {
1019 u32 addr;
david-b@pacbell.netd0384202005-08-13 18:44:58 -07001020 int think_time;
Clemens Ladisch469d0222006-01-20 13:49:10 -08001021 int hs_transfers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
1023 addr = dev->ttport << 24;
1024 if (!ehci_is_TDI(ehci)
1025 || (dev->tt->hub !=
1026 ehci_to_hcd(ehci)->self.root_hub))
1027 addr |= dev->tt->hub->devnum << 16;
1028 addr |= epnum << 8;
1029 addr |= dev->devnum;
1030 stream->usecs = HS_USECS_ISO (maxp);
david-b@pacbell.netd0384202005-08-13 18:44:58 -07001031 think_time = dev->tt ? dev->tt->think_time : 0;
1032 stream->tt_usecs = NS_TO_US (think_time + usb_calc_bus_time (
1033 dev->speed, is_input, 1, maxp));
Clemens Ladisch469d0222006-01-20 13:49:10 -08001034 hs_transfers = max (1u, (maxp + 187) / 188);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 if (is_input) {
1036 u32 tmp;
1037
1038 addr |= 1 << 31;
1039 stream->c_usecs = stream->usecs;
1040 stream->usecs = HS_USECS_ISO (1);
1041 stream->raw_mask = 1;
1042
Clemens Ladisch469d0222006-01-20 13:49:10 -08001043 /* c-mask as specified in USB 2.0 11.18.4 3.c */
1044 tmp = (1 << (hs_transfers + 2)) - 1;
1045 stream->raw_mask |= tmp << (8 + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 } else
Clemens Ladisch469d0222006-01-20 13:49:10 -08001047 stream->raw_mask = smask_out [hs_transfers - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 bandwidth = stream->usecs + stream->c_usecs;
Alan Stern372dd6e2008-11-12 17:02:57 -05001049 bandwidth /= interval << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050
1051 /* stream->splits gets created from raw_mask later */
Stefan Roese6dbd6822007-05-01 09:29:37 -07001052 stream->address = cpu_to_hc32(ehci, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 }
1054 stream->bandwidth = bandwidth;
1055
1056 stream->udev = dev;
1057
1058 stream->bEndpointAddress = is_input | epnum;
1059 stream->interval = interval;
1060 stream->maxp = maxp;
1061}
1062
1063static void
1064iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream)
1065{
1066 stream->refcount--;
1067
1068 /* free whenever just a dev->ep reference remains.
1069 * not like a QH -- no persistent state (toggle, halt)
1070 */
1071 if (stream->refcount == 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 // BUG_ON (!list_empty(&stream->td_list));
1073
1074 while (!list_empty (&stream->free_list)) {
1075 struct list_head *entry;
1076
1077 entry = stream->free_list.next;
1078 list_del (entry);
1079
1080 /* knows about ITD vs SITD */
1081 if (stream->highspeed) {
1082 struct ehci_itd *itd;
1083
1084 itd = list_entry (entry, struct ehci_itd,
1085 itd_list);
1086 dma_pool_free (ehci->itd_pool, itd,
1087 itd->itd_dma);
1088 } else {
1089 struct ehci_sitd *sitd;
1090
1091 sitd = list_entry (entry, struct ehci_sitd,
1092 sitd_list);
1093 dma_pool_free (ehci->sitd_pool, sitd,
1094 sitd->sitd_dma);
1095 }
1096 }
1097
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 stream->bEndpointAddress &= 0x0f;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08001099 if (stream->ep)
1100 stream->ep->hcpriv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 kfree(stream);
1103 }
1104}
1105
1106static inline struct ehci_iso_stream *
1107iso_stream_get (struct ehci_iso_stream *stream)
1108{
1109 if (likely (stream != NULL))
1110 stream->refcount++;
1111 return stream;
1112}
1113
1114static struct ehci_iso_stream *
1115iso_stream_find (struct ehci_hcd *ehci, struct urb *urb)
1116{
1117 unsigned epnum;
1118 struct ehci_iso_stream *stream;
1119 struct usb_host_endpoint *ep;
1120 unsigned long flags;
1121
1122 epnum = usb_pipeendpoint (urb->pipe);
1123 if (usb_pipein(urb->pipe))
1124 ep = urb->dev->ep_in[epnum];
1125 else
1126 ep = urb->dev->ep_out[epnum];
1127
1128 spin_lock_irqsave (&ehci->lock, flags);
1129 stream = ep->hcpriv;
1130
1131 if (unlikely (stream == NULL)) {
1132 stream = iso_stream_alloc(GFP_ATOMIC);
1133 if (likely (stream != NULL)) {
1134 /* dev->ep owns the initial refcount */
1135 ep->hcpriv = stream;
1136 stream->ep = ep;
1137 iso_stream_init(ehci, stream, urb->dev, urb->pipe,
1138 urb->interval);
1139 }
1140
Clemens Ladisch1082f572010-03-01 17:18:56 +01001141 /* if dev->ep [epnum] is a QH, hw is set */
1142 } else if (unlikely (stream->hw != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 ehci_dbg (ehci, "dev %s ep%d%s, not iso??\n",
1144 urb->dev->devpath, epnum,
1145 usb_pipein(urb->pipe) ? "in" : "out");
1146 stream = NULL;
1147 }
1148
1149 /* caller guarantees an eventual matching iso_stream_put */
1150 stream = iso_stream_get (stream);
1151
1152 spin_unlock_irqrestore (&ehci->lock, flags);
1153 return stream;
1154}
1155
1156/*-------------------------------------------------------------------------*/
1157
1158/* ehci_iso_sched ops can be ITD-only or SITD-only */
1159
1160static struct ehci_iso_sched *
Al Viro55016f12005-10-21 03:21:58 -04001161iso_sched_alloc (unsigned packets, gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162{
1163 struct ehci_iso_sched *iso_sched;
1164 int size = sizeof *iso_sched;
1165
1166 size += packets * sizeof (struct ehci_iso_packet);
Eric Sesterhenn80b6ca42006-02-27 21:29:43 +01001167 iso_sched = kzalloc(size, mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 if (likely (iso_sched != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 INIT_LIST_HEAD (&iso_sched->td_list);
1170 }
1171 return iso_sched;
1172}
1173
1174static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001175itd_sched_init(
1176 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 struct ehci_iso_sched *iso_sched,
1178 struct ehci_iso_stream *stream,
1179 struct urb *urb
1180)
1181{
1182 unsigned i;
1183 dma_addr_t dma = urb->transfer_dma;
1184
1185 /* how many uframes are needed for these transfers */
1186 iso_sched->span = urb->number_of_packets * stream->interval;
1187
1188 /* figure out per-uframe itd fields that we'll need later
1189 * when we fit new itds into the schedule.
1190 */
1191 for (i = 0; i < urb->number_of_packets; i++) {
1192 struct ehci_iso_packet *uframe = &iso_sched->packet [i];
1193 unsigned length;
1194 dma_addr_t buf;
1195 u32 trans;
1196
1197 length = urb->iso_frame_desc [i].length;
1198 buf = dma + urb->iso_frame_desc [i].offset;
1199
1200 trans = EHCI_ISOC_ACTIVE;
1201 trans |= buf & 0x0fff;
1202 if (unlikely (((i + 1) == urb->number_of_packets))
1203 && !(urb->transfer_flags & URB_NO_INTERRUPT))
1204 trans |= EHCI_ITD_IOC;
1205 trans |= length << 16;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001206 uframe->transaction = cpu_to_hc32(ehci, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
David Brownell77078572005-05-28 10:46:18 -07001208 /* might need to cross a buffer page within a uframe */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 uframe->bufp = (buf & ~(u64)0x0fff);
1210 buf += length;
1211 if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff))))
1212 uframe->cross = 1;
1213 }
1214}
1215
1216static void
1217iso_sched_free (
1218 struct ehci_iso_stream *stream,
1219 struct ehci_iso_sched *iso_sched
1220)
1221{
1222 if (!iso_sched)
1223 return;
1224 // caller must hold ehci->lock!
1225 list_splice (&iso_sched->td_list, &stream->free_list);
1226 kfree (iso_sched);
1227}
1228
1229static int
1230itd_urb_transaction (
1231 struct ehci_iso_stream *stream,
1232 struct ehci_hcd *ehci,
1233 struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04001234 gfp_t mem_flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235)
1236{
1237 struct ehci_itd *itd;
1238 dma_addr_t itd_dma;
1239 int i;
1240 unsigned num_itds;
1241 struct ehci_iso_sched *sched;
1242 unsigned long flags;
1243
1244 sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
1245 if (unlikely (sched == NULL))
1246 return -ENOMEM;
1247
Stefan Roese6dbd6822007-05-01 09:29:37 -07001248 itd_sched_init(ehci, sched, stream, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
1250 if (urb->interval < 8)
1251 num_itds = 1 + (sched->span + 7) / 8;
1252 else
1253 num_itds = urb->number_of_packets;
1254
1255 /* allocate/init ITDs */
1256 spin_lock_irqsave (&ehci->lock, flags);
1257 for (i = 0; i < num_itds; i++) {
1258
1259 /* free_list.next might be cache-hot ... but maybe
1260 * the HC caches it too. avoid that issue for now.
1261 */
1262
1263 /* prefer previously-allocated itds */
1264 if (likely (!list_empty(&stream->free_list))) {
1265 itd = list_entry (stream->free_list.prev,
Stefan Roese6dbd6822007-05-01 09:29:37 -07001266 struct ehci_itd, itd_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 list_del (&itd->itd_list);
1268 itd_dma = itd->itd_dma;
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001269 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 spin_unlock_irqrestore (&ehci->lock, flags);
1271 itd = dma_pool_alloc (ehci->itd_pool, mem_flags,
1272 &itd_dma);
1273 spin_lock_irqsave (&ehci->lock, flags);
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001274 if (!itd) {
1275 iso_sched_free(stream, sched);
1276 spin_unlock_irqrestore(&ehci->lock, flags);
1277 return -ENOMEM;
1278 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 }
1280
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 memset (itd, 0, sizeof *itd);
1282 itd->itd_dma = itd_dma;
1283 list_add (&itd->itd_list, &sched->td_list);
1284 }
1285 spin_unlock_irqrestore (&ehci->lock, flags);
1286
1287 /* temporarily store schedule info in hcpriv */
1288 urb->hcpriv = sched;
1289 urb->error_count = 0;
1290 return 0;
1291}
1292
1293/*-------------------------------------------------------------------------*/
1294
1295static inline int
1296itd_slot_ok (
1297 struct ehci_hcd *ehci,
1298 u32 mod,
1299 u32 uframe,
1300 u8 usecs,
1301 u32 period
1302)
1303{
1304 uframe %= period;
1305 do {
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +04001306 /* can't commit more than uframe_periodic_max usec */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 if (periodic_usecs (ehci, uframe >> 3, uframe & 0x7)
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +04001308 > (ehci->uframe_periodic_max - usecs))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 return 0;
1310
1311 /* we know urb->interval is 2^N uframes */
1312 uframe += period;
1313 } while (uframe < mod);
1314 return 1;
1315}
1316
1317static inline int
1318sitd_slot_ok (
1319 struct ehci_hcd *ehci,
1320 u32 mod,
1321 struct ehci_iso_stream *stream,
1322 u32 uframe,
1323 struct ehci_iso_sched *sched,
1324 u32 period_uframes
1325)
1326{
1327 u32 mask, tmp;
1328 u32 frame, uf;
1329
1330 mask = stream->raw_mask << (uframe & 7);
1331
1332 /* for IN, don't wrap CSPLIT into the next frame */
1333 if (mask & ~0xffff)
1334 return 0;
1335
1336 /* this multi-pass logic is simple, but performance may
1337 * suffer when the schedule data isn't cached.
1338 */
1339
1340 /* check bandwidth */
1341 uframe %= period_uframes;
1342 do {
1343 u32 max_used;
1344
1345 frame = uframe >> 3;
1346 uf = uframe & 7;
1347
Dan Streetmanba47f662006-05-24 09:39:16 -07001348#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
1349 /* The tt's fullspeed bus bandwidth must be available.
1350 * tt_available scheduling guarantees 10+% for control/bulk.
1351 */
1352 if (!tt_available (ehci, period_uframes << 3,
1353 stream->udev, frame, uf, stream->tt_usecs))
1354 return 0;
1355#else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 /* tt must be idle for start(s), any gap, and csplit.
1357 * assume scheduling slop leaves 10+% for control/bulk.
1358 */
1359 if (!tt_no_collision (ehci, period_uframes << 3,
1360 stream->udev, frame, mask))
1361 return 0;
Dan Streetmanba47f662006-05-24 09:39:16 -07001362#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
1364 /* check starts (OUT uses more than one) */
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +04001365 max_used = ehci->uframe_periodic_max - stream->usecs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 for (tmp = stream->raw_mask & 0xff; tmp; tmp >>= 1, uf++) {
1367 if (periodic_usecs (ehci, frame, uf) > max_used)
1368 return 0;
1369 }
1370
1371 /* for IN, check CSPLIT */
1372 if (stream->c_usecs) {
Clemens Ladisch0c734622006-01-22 10:32:49 -08001373 uf = uframe & 7;
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +04001374 max_used = ehci->uframe_periodic_max - stream->c_usecs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 do {
1376 tmp = 1 << uf;
1377 tmp <<= 8;
1378 if ((stream->raw_mask & tmp) == 0)
1379 continue;
1380 if (periodic_usecs (ehci, frame, uf)
1381 > max_used)
1382 return 0;
1383 } while (++uf < 8);
1384 }
1385
1386 /* we know urb->interval is 2^N uframes */
1387 uframe += period_uframes;
1388 } while (uframe < mod);
1389
Stefan Roese6dbd6822007-05-01 09:29:37 -07001390 stream->splits = cpu_to_hc32(ehci, stream->raw_mask << (uframe & 7));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 return 1;
1392}
1393
1394/*
1395 * This scheduler plans almost as far into the future as it has actual
1396 * periodic schedule slots. (Affected by TUNE_FLS, which defaults to
1397 * "as small as possible" to be cache-friendlier.) That limits the size
1398 * transfers you can stream reliably; avoid more than 64 msec per urb.
1399 * Also avoid queue depths of less than ehci's worst irq latency (affected
1400 * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
1401 * and other factors); or more than about 230 msec total (for portability,
1402 * given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler!
1403 */
1404
Sarah Sharpd7e055f2009-10-27 10:54:49 -07001405#define SCHEDULE_SLOP 80 /* microframes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406
1407static int
1408iso_stream_schedule (
1409 struct ehci_hcd *ehci,
1410 struct urb *urb,
1411 struct ehci_iso_stream *stream
1412)
1413{
Alan Sternffda0802010-07-14 11:03:46 -04001414 u32 now, next, start, period, span;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 int status;
1416 unsigned mod = ehci->periodic_size << 3;
1417 struct ehci_iso_sched *sched = urb->hcpriv;
1418
Alan Sternffda0802010-07-14 11:03:46 -04001419 period = urb->interval;
1420 span = sched->span;
1421 if (!stream->highspeed) {
1422 period <<= 3;
1423 span <<= 3;
1424 }
1425
1426 if (span > mod - SCHEDULE_SLOP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 ehci_dbg (ehci, "iso request %p too long\n", urb);
1428 status = -EFBIG;
1429 goto fail;
1430 }
1431
Alan Stern68aa95d2011-10-12 10:39:14 -04001432 now = ehci_read_frame_index(ehci) & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433
Alan Sternb40e43f2008-05-20 16:59:10 -04001434 /* Typical case: reuse current schedule, stream is still active.
1435 * Hopefully there are no gaps from the host falling behind
1436 * (irq delays etc), but if there are we'll take the next
1437 * slot in the schedule, implicitly assuming URB_ISO_ASAP.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 */
1439 if (likely (!list_empty (&stream->td_list))) {
Alan Stern1fb2e052010-07-14 11:03:53 -04001440 u32 excess;
Sarah Sharpdccd5742009-10-27 10:55:05 -07001441
1442 /* For high speed devices, allow scheduling within the
Alan Sternae68a832010-07-14 11:03:23 -04001443 * isochronous scheduling threshold. For full speed devices
1444 * and Intel PCI-based controllers, don't (work around for
1445 * Intel ICH9 bug).
Sarah Sharpdccd5742009-10-27 10:55:05 -07001446 */
Alan Sternae68a832010-07-14 11:03:23 -04001447 if (!stream->highspeed && ehci->fs_i_thresh)
Sarah Sharpdccd5742009-10-27 10:55:05 -07001448 next = now + ehci->i_thresh;
1449 else
1450 next = now;
Alan Sternb40e43f2008-05-20 16:59:10 -04001451
Alan Stern1fb2e052010-07-14 11:03:53 -04001452 /* Fell behind (by up to twice the slop amount)?
1453 * We decide based on the time of the last currently-scheduled
1454 * slot, not the time of the next available slot.
1455 */
1456 excess = (stream->next_uframe - period - next) & (mod - 1);
1457 if (excess >= mod - 2 * SCHEDULE_SLOP)
1458 start = next + excess - mod + period *
1459 DIV_ROUND_UP(mod - excess, period);
1460 else
1461 start = next + excess + period;
1462 if (start - now >= mod) {
1463 ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
1464 urb, start - now - period, period,
1465 mod);
Alan Sternb40e43f2008-05-20 16:59:10 -04001466 status = -EFBIG;
1467 goto fail;
1468 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 }
1470
1471 /* need to schedule; when's the next (u)frame we could start?
1472 * this is bigger than ehci->i_thresh allows; scheduling itself
1473 * isn't free, the slop should handle reasonably slow cpus. it
1474 * can also help high bandwidth if the dma and irq loads don't
1475 * jump until after the queue is primed.
1476 */
Alan Stern1fb2e052010-07-14 11:03:53 -04001477 else {
1478 start = SCHEDULE_SLOP + (now & ~0x07);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
Alan Stern1fb2e052010-07-14 11:03:53 -04001480 /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481
Thomas Poussevin811c9262011-10-27 18:46:48 +02001482 /* find a uframe slot with enough bandwidth.
1483 * Early uframes are more precious because full-speed
1484 * iso IN transfers can't use late uframes,
1485 * and therefore they should be allocated last.
1486 */
1487 next = start;
1488 start += period;
1489 do {
1490 start--;
Alan Stern1fb2e052010-07-14 11:03:53 -04001491 /* check schedule: enough space? */
1492 if (stream->highspeed) {
1493 if (itd_slot_ok(ehci, mod, start,
1494 stream->usecs, period))
1495 break;
1496 } else {
1497 if ((start % 8) >= 6)
1498 continue;
1499 if (sitd_slot_ok(ehci, mod, stream,
1500 start, sched, period))
1501 break;
1502 }
Thomas Poussevin811c9262011-10-27 18:46:48 +02001503 } while (start > next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504
Alan Stern1fb2e052010-07-14 11:03:53 -04001505 /* no room in the schedule */
1506 if (start == next) {
1507 ehci_dbg(ehci, "iso resched full %p (now %d max %d)\n",
1508 urb, now, now + mod);
1509 status = -ENOSPC;
1510 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 }
1512 }
1513
Alan Stern1fb2e052010-07-14 11:03:53 -04001514 /* Tried to schedule too far into the future? */
1515 if (unlikely(start - now + span - period
1516 >= mod - 2 * SCHEDULE_SLOP)) {
1517 ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
1518 urb, start - now, span - period,
1519 mod - 2 * SCHEDULE_SLOP);
1520 status = -EFBIG;
1521 goto fail;
1522 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523
Alan Stern1fb2e052010-07-14 11:03:53 -04001524 stream->next_uframe = start & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 /* report high speed start in uframes; full speed, in frames */
1527 urb->start_frame = stream->next_uframe;
1528 if (!stream->highspeed)
1529 urb->start_frame >>= 3;
1530 return 0;
Alan Stern1fb2e052010-07-14 11:03:53 -04001531
1532 fail:
1533 iso_sched_free(stream, sched);
1534 urb->hcpriv = NULL;
1535 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536}
1537
1538/*-------------------------------------------------------------------------*/
1539
1540static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001541itd_init(struct ehci_hcd *ehci, struct ehci_iso_stream *stream,
1542 struct ehci_itd *itd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543{
1544 int i;
1545
David Brownell77078572005-05-28 10:46:18 -07001546 /* it's been recently zeroed */
Stefan Roese6dbd6822007-05-01 09:29:37 -07001547 itd->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 itd->hw_bufp [0] = stream->buf0;
1549 itd->hw_bufp [1] = stream->buf1;
1550 itd->hw_bufp [2] = stream->buf2;
1551
1552 for (i = 0; i < 8; i++)
1553 itd->index[i] = -1;
1554
1555 /* All other fields are filled when scheduling */
1556}
1557
1558static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001559itd_patch(
1560 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 struct ehci_itd *itd,
1562 struct ehci_iso_sched *iso_sched,
1563 unsigned index,
David Brownell77078572005-05-28 10:46:18 -07001564 u16 uframe
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565)
1566{
1567 struct ehci_iso_packet *uf = &iso_sched->packet [index];
1568 unsigned pg = itd->pg;
1569
1570 // BUG_ON (pg == 6 && uf->cross);
1571
1572 uframe &= 0x07;
1573 itd->index [uframe] = index;
1574
Stefan Roese6dbd6822007-05-01 09:29:37 -07001575 itd->hw_transaction[uframe] = uf->transaction;
1576 itd->hw_transaction[uframe] |= cpu_to_hc32(ehci, pg << 12);
1577 itd->hw_bufp[pg] |= cpu_to_hc32(ehci, uf->bufp & ~(u32)0);
1578 itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(uf->bufp >> 32));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579
1580 /* iso_frame_desc[].offset must be strictly increasing */
David Brownell77078572005-05-28 10:46:18 -07001581 if (unlikely (uf->cross)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 u64 bufp = uf->bufp + 4096;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001583
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 itd->pg = ++pg;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001585 itd->hw_bufp[pg] |= cpu_to_hc32(ehci, bufp & ~(u32)0);
1586 itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(bufp >> 32));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 }
1588}
1589
1590static inline void
1591itd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_itd *itd)
1592{
Clemens Ladisch92bc3642010-03-01 09:12:50 +01001593 union ehci_shadow *prev = &ehci->pshadow[frame];
1594 __hc32 *hw_p = &ehci->periodic[frame];
1595 union ehci_shadow here = *prev;
1596 __hc32 type = 0;
1597
1598 /* skip any iso nodes which might belong to previous microframes */
1599 while (here.ptr) {
1600 type = Q_NEXT_TYPE(ehci, *hw_p);
1601 if (type == cpu_to_hc32(ehci, Q_TYPE_QH))
1602 break;
1603 prev = periodic_next_shadow(ehci, prev, type);
1604 hw_p = shadow_next_periodic(ehci, &here, type);
1605 here = *prev;
1606 }
1607
1608 itd->itd_next = here;
1609 itd->hw_next = *hw_p;
1610 prev->itd = itd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 itd->frame = frame;
1612 wmb ();
Clemens Ladisch92bc3642010-03-01 09:12:50 +01001613 *hw_p = cpu_to_hc32(ehci, itd->itd_dma | Q_TYPE_ITD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614}
1615
1616/* fit urb's itds into the selected schedule slot; activate as needed */
1617static int
1618itd_link_urb (
1619 struct ehci_hcd *ehci,
1620 struct urb *urb,
1621 unsigned mod,
1622 struct ehci_iso_stream *stream
1623)
1624{
David Brownell77078572005-05-28 10:46:18 -07001625 int packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 unsigned next_uframe, uframe, frame;
1627 struct ehci_iso_sched *iso_sched = urb->hcpriv;
1628 struct ehci_itd *itd;
1629
Alan Sternbccbefa2010-07-14 11:03:36 -04001630 next_uframe = stream->next_uframe & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631
1632 if (unlikely (list_empty(&stream->td_list))) {
1633 ehci_to_hcd(ehci)->self.bandwidth_allocated
1634 += stream->bandwidth;
1635 ehci_vdbg (ehci,
1636 "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
1637 urb->dev->devpath, stream->bEndpointAddress & 0x0f,
1638 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
1639 urb->interval,
1640 next_uframe >> 3, next_uframe & 0x7);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 }
Alex He05570292010-12-07 10:10:08 +08001642
1643 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08001644 if (ehci->amd_pll_fix == 1)
1645 usb_amd_quirk_pll_disable();
Alex He05570292010-12-07 10:10:08 +08001646 }
1647
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
1649
1650 /* fill iTDs uframe by uframe */
1651 for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) {
1652 if (itd == NULL) {
1653 /* ASSERT: we have all necessary itds */
1654 // BUG_ON (list_empty (&iso_sched->td_list));
1655
1656 /* ASSERT: no itds for this endpoint in this uframe */
1657
1658 itd = list_entry (iso_sched->td_list.next,
1659 struct ehci_itd, itd_list);
1660 list_move_tail (&itd->itd_list, &stream->td_list);
1661 itd->stream = iso_stream_get (stream);
Karsten Wiese508db8c2009-02-26 01:47:48 +01001662 itd->urb = urb;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001663 itd_init (ehci, stream, itd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 }
1665
1666 uframe = next_uframe & 0x07;
1667 frame = next_uframe >> 3;
1668
Stefan Roese6dbd6822007-05-01 09:29:37 -07001669 itd_patch(ehci, itd, iso_sched, packet, uframe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670
1671 next_uframe += stream->interval;
Alan Sternbccbefa2010-07-14 11:03:36 -04001672 next_uframe &= mod - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 packet++;
1674
1675 /* link completed itds into the schedule */
1676 if (((next_uframe >> 3) != frame)
1677 || packet == urb->number_of_packets) {
Alan Sternbccbefa2010-07-14 11:03:36 -04001678 itd_link(ehci, frame & (ehci->periodic_size - 1), itd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 itd = NULL;
1680 }
1681 }
1682 stream->next_uframe = next_uframe;
1683
1684 /* don't need that schedule data any more */
1685 iso_sched_free (stream, iso_sched);
1686 urb->hcpriv = NULL;
1687
1688 timer_action (ehci, TIMER_IO_WATCHDOG);
David Brownell01c17142008-08-26 23:35:04 -07001689 return enable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690}
1691
1692#define ISO_ERRS (EHCI_ISOC_BUF_ERR | EHCI_ISOC_BABBLE | EHCI_ISOC_XACTERR)
1693
David Brownell30bf54e2007-12-16 22:37:40 -08001694/* Process and recycle a completed ITD. Return true iff its urb completed,
1695 * and hence its completion callback probably added things to the hardware
1696 * schedule.
1697 *
1698 * Note that we carefully avoid recycling this descriptor until after any
1699 * completion callback runs, so that it won't be reused quickly. That is,
1700 * assuming (a) no more than two urbs per frame on this endpoint, and also
1701 * (b) only this endpoint's completions submit URBs. It seems some silicon
1702 * corrupts things if you reuse completed descriptors very quickly...
1703 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704static unsigned
1705itd_complete (
1706 struct ehci_hcd *ehci,
David Howells7d12e782006-10-05 14:55:46 +01001707 struct ehci_itd *itd
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708) {
1709 struct urb *urb = itd->urb;
1710 struct usb_iso_packet_descriptor *desc;
1711 u32 t;
1712 unsigned uframe;
1713 int urb_index = -1;
1714 struct ehci_iso_stream *stream = itd->stream;
1715 struct usb_device *dev;
David Brownell30bf54e2007-12-16 22:37:40 -08001716 unsigned retval = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717
1718 /* for each uframe with a packet */
1719 for (uframe = 0; uframe < 8; uframe++) {
1720 if (likely (itd->index[uframe] == -1))
1721 continue;
1722 urb_index = itd->index[uframe];
1723 desc = &urb->iso_frame_desc [urb_index];
1724
Stefan Roese6dbd6822007-05-01 09:29:37 -07001725 t = hc32_to_cpup(ehci, &itd->hw_transaction [uframe]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 itd->hw_transaction [uframe] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727
1728 /* report transfer status */
1729 if (unlikely (t & ISO_ERRS)) {
1730 urb->error_count++;
1731 if (t & EHCI_ISOC_BUF_ERR)
1732 desc->status = usb_pipein (urb->pipe)
1733 ? -ENOSR /* hc couldn't read */
1734 : -ECOMM; /* hc couldn't write */
1735 else if (t & EHCI_ISOC_BABBLE)
1736 desc->status = -EOVERFLOW;
1737 else /* (t & EHCI_ISOC_XACTERR) */
1738 desc->status = -EPROTO;
1739
1740 /* HC need not update length with this error */
Alan Sternec6d67e2009-06-29 14:34:59 -04001741 if (!(t & EHCI_ISOC_BABBLE)) {
1742 desc->actual_length = EHCI_ITD_LENGTH(t);
1743 urb->actual_length += desc->actual_length;
1744 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 } else if (likely ((t & EHCI_ISOC_ACTIVE) == 0)) {
1746 desc->status = 0;
Alan Sternec6d67e2009-06-29 14:34:59 -04001747 desc->actual_length = EHCI_ITD_LENGTH(t);
1748 urb->actual_length += desc->actual_length;
Alan Sternb40e43f2008-05-20 16:59:10 -04001749 } else {
1750 /* URB was too late */
1751 desc->status = -EXDEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 }
1753 }
1754
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755 /* handle completion now? */
1756 if (likely ((urb_index + 1) != urb->number_of_packets))
David Brownell30bf54e2007-12-16 22:37:40 -08001757 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758
1759 /* ASSERT: it's really the last itd for this urb
1760 list_for_each_entry (itd, &stream->td_list, itd_list)
1761 BUG_ON (itd->urb == urb);
1762 */
1763
David Brownellaa16ca32007-12-30 23:45:19 -08001764 /* give urb back to the driver; completion often (re)submits */
Alan Stern6a8e87b2006-01-19 10:46:27 -05001765 dev = urb->dev;
Alan Stern14c04c02007-08-24 15:40:19 -04001766 ehci_urb_done(ehci, urb, 0);
David Brownell30bf54e2007-12-16 22:37:40 -08001767 retval = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 urb = NULL;
David Brownell01c17142008-08-26 23:35:04 -07001769 (void) disable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
1771
Alex He05570292010-12-07 10:10:08 +08001772 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08001773 if (ehci->amd_pll_fix == 1)
1774 usb_amd_quirk_pll_enable();
Alex He05570292010-12-07 10:10:08 +08001775 }
1776
Karsten Wiese508db8c2009-02-26 01:47:48 +01001777 if (unlikely(list_is_singular(&stream->td_list))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 ehci_to_hcd(ehci)->self.bandwidth_allocated
1779 -= stream->bandwidth;
1780 ehci_vdbg (ehci,
1781 "deschedule devp %s ep%d%s-iso\n",
1782 dev->devpath, stream->bEndpointAddress & 0x0f,
1783 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
1784 }
1785 iso_stream_put (ehci, stream);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08001786
David Brownell30bf54e2007-12-16 22:37:40 -08001787done:
David Brownell30bf54e2007-12-16 22:37:40 -08001788 itd->urb = NULL;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08001789 if (ehci->clock_frame != itd->frame || itd->index[7] != -1) {
1790 /* OK to recycle this ITD now. */
1791 itd->stream = NULL;
1792 list_move(&itd->itd_list, &stream->free_list);
1793 iso_stream_put(ehci, stream);
1794 } else {
1795 /* HW might remember this ITD, so we can't recycle it yet.
1796 * Move it to a safe place until a new frame starts.
1797 */
1798 list_move(&itd->itd_list, &ehci->cached_itd_list);
1799 if (stream->refcount == 2) {
1800 /* If iso_stream_put() were called here, stream
1801 * would be freed. Instead, just prevent reuse.
1802 */
1803 stream->ep->hcpriv = NULL;
1804 stream->ep = NULL;
1805 }
1806 }
David Brownell30bf54e2007-12-16 22:37:40 -08001807 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808}
1809
1810/*-------------------------------------------------------------------------*/
1811
Olav Kongas5db539e2005-06-23 20:25:36 +03001812static int itd_submit (struct ehci_hcd *ehci, struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04001813 gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814{
1815 int status = -EINVAL;
1816 unsigned long flags;
1817 struct ehci_iso_stream *stream;
1818
1819 /* Get iso_stream head */
1820 stream = iso_stream_find (ehci, urb);
1821 if (unlikely (stream == NULL)) {
1822 ehci_dbg (ehci, "can't get iso stream\n");
1823 return -ENOMEM;
1824 }
1825 if (unlikely (urb->interval != stream->interval)) {
1826 ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
1827 stream->interval, urb->interval);
1828 goto done;
1829 }
1830
1831#ifdef EHCI_URB_TRACE
1832 ehci_dbg (ehci,
1833 "%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n",
Harvey Harrison441b62c2008-03-03 16:08:34 -08001834 __func__, urb->dev->devpath, urb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 usb_pipeendpoint (urb->pipe),
1836 usb_pipein (urb->pipe) ? "in" : "out",
1837 urb->transfer_buffer_length,
1838 urb->number_of_packets, urb->interval,
1839 stream);
1840#endif
1841
1842 /* allocate ITDs w/o locking anything */
1843 status = itd_urb_transaction (stream, ehci, urb, mem_flags);
1844 if (unlikely (status < 0)) {
1845 ehci_dbg (ehci, "can't init itds\n");
1846 goto done;
1847 }
1848
1849 /* schedule ... need to lock */
1850 spin_lock_irqsave (&ehci->lock, flags);
Alan Stern541c7d42010-06-22 16:39:10 -04001851 if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +11001852 status = -ESHUTDOWN;
Alan Sterne9df41c2007-08-08 11:48:02 -04001853 goto done_not_linked;
1854 }
1855 status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
1856 if (unlikely(status))
1857 goto done_not_linked;
1858 status = iso_stream_schedule(ehci, urb, stream);
David Brownell53bd6a62006-08-30 14:50:06 -07001859 if (likely (status == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
Alan Sterne9df41c2007-08-08 11:48:02 -04001861 else
1862 usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
1863done_not_linked:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 spin_unlock_irqrestore (&ehci->lock, flags);
1865
1866done:
1867 if (unlikely (status < 0))
1868 iso_stream_put (ehci, stream);
1869 return status;
1870}
1871
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872/*-------------------------------------------------------------------------*/
1873
1874/*
1875 * "Split ISO TDs" ... used for USB 1.1 devices going through the
1876 * TTs in USB 2.0 hubs. These need microframe scheduling.
1877 */
1878
1879static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001880sitd_sched_init(
1881 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 struct ehci_iso_sched *iso_sched,
1883 struct ehci_iso_stream *stream,
1884 struct urb *urb
1885)
1886{
1887 unsigned i;
1888 dma_addr_t dma = urb->transfer_dma;
1889
1890 /* how many frames are needed for these transfers */
1891 iso_sched->span = urb->number_of_packets * stream->interval;
1892
1893 /* figure out per-frame sitd fields that we'll need later
1894 * when we fit new sitds into the schedule.
1895 */
1896 for (i = 0; i < urb->number_of_packets; i++) {
1897 struct ehci_iso_packet *packet = &iso_sched->packet [i];
1898 unsigned length;
1899 dma_addr_t buf;
1900 u32 trans;
1901
1902 length = urb->iso_frame_desc [i].length & 0x03ff;
1903 buf = dma + urb->iso_frame_desc [i].offset;
1904
1905 trans = SITD_STS_ACTIVE;
1906 if (((i + 1) == urb->number_of_packets)
1907 && !(urb->transfer_flags & URB_NO_INTERRUPT))
1908 trans |= SITD_IOC;
1909 trans |= length << 16;
Stefan Roese6dbd6822007-05-01 09:29:37 -07001910 packet->transaction = cpu_to_hc32(ehci, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
1912 /* might need to cross a buffer page within a td */
1913 packet->bufp = buf;
1914 packet->buf1 = (buf + length) & ~0x0fff;
1915 if (packet->buf1 != (buf & ~(u64)0x0fff))
1916 packet->cross = 1;
1917
David Brownell53bd6a62006-08-30 14:50:06 -07001918 /* OUT uses multiple start-splits */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 if (stream->bEndpointAddress & USB_DIR_IN)
1920 continue;
1921 length = (length + 187) / 188;
1922 if (length > 1) /* BEGIN vs ALL */
1923 length |= 1 << 3;
1924 packet->buf1 |= length;
1925 }
1926}
1927
1928static int
1929sitd_urb_transaction (
1930 struct ehci_iso_stream *stream,
1931 struct ehci_hcd *ehci,
1932 struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04001933 gfp_t mem_flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934)
1935{
1936 struct ehci_sitd *sitd;
1937 dma_addr_t sitd_dma;
1938 int i;
1939 struct ehci_iso_sched *iso_sched;
1940 unsigned long flags;
1941
1942 iso_sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
1943 if (iso_sched == NULL)
1944 return -ENOMEM;
1945
Stefan Roese6dbd6822007-05-01 09:29:37 -07001946 sitd_sched_init(ehci, iso_sched, stream, urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947
1948 /* allocate/init sITDs */
1949 spin_lock_irqsave (&ehci->lock, flags);
1950 for (i = 0; i < urb->number_of_packets; i++) {
1951
1952 /* NOTE: for now, we don't try to handle wraparound cases
1953 * for IN (using sitd->hw_backpointer, like a FSTN), which
1954 * means we never need two sitds for full speed packets.
1955 */
1956
1957 /* free_list.next might be cache-hot ... but maybe
1958 * the HC caches it too. avoid that issue for now.
1959 */
1960
1961 /* prefer previously-allocated sitds */
1962 if (!list_empty(&stream->free_list)) {
1963 sitd = list_entry (stream->free_list.prev,
1964 struct ehci_sitd, sitd_list);
1965 list_del (&sitd->sitd_list);
1966 sitd_dma = sitd->sitd_dma;
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001967 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 spin_unlock_irqrestore (&ehci->lock, flags);
1969 sitd = dma_pool_alloc (ehci->sitd_pool, mem_flags,
1970 &sitd_dma);
1971 spin_lock_irqsave (&ehci->lock, flags);
Karsten Wiese3d01f0f2008-02-19 12:31:49 -08001972 if (!sitd) {
1973 iso_sched_free(stream, iso_sched);
1974 spin_unlock_irqrestore(&ehci->lock, flags);
1975 return -ENOMEM;
1976 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 }
1978
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 memset (sitd, 0, sizeof *sitd);
1980 sitd->sitd_dma = sitd_dma;
1981 list_add (&sitd->sitd_list, &iso_sched->td_list);
1982 }
1983
1984 /* temporarily store schedule info in hcpriv */
1985 urb->hcpriv = iso_sched;
1986 urb->error_count = 0;
1987
1988 spin_unlock_irqrestore (&ehci->lock, flags);
1989 return 0;
1990}
1991
1992/*-------------------------------------------------------------------------*/
1993
1994static inline void
Stefan Roese6dbd6822007-05-01 09:29:37 -07001995sitd_patch(
1996 struct ehci_hcd *ehci,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 struct ehci_iso_stream *stream,
1998 struct ehci_sitd *sitd,
1999 struct ehci_iso_sched *iso_sched,
2000 unsigned index
2001)
2002{
2003 struct ehci_iso_packet *uf = &iso_sched->packet [index];
2004 u64 bufp = uf->bufp;
2005
Stefan Roese6dbd6822007-05-01 09:29:37 -07002006 sitd->hw_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 sitd->hw_fullspeed_ep = stream->address;
2008 sitd->hw_uframe = stream->splits;
2009 sitd->hw_results = uf->transaction;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002010 sitd->hw_backpointer = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011
2012 bufp = uf->bufp;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002013 sitd->hw_buf[0] = cpu_to_hc32(ehci, bufp);
2014 sitd->hw_buf_hi[0] = cpu_to_hc32(ehci, bufp >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015
Stefan Roese6dbd6822007-05-01 09:29:37 -07002016 sitd->hw_buf[1] = cpu_to_hc32(ehci, uf->buf1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 if (uf->cross)
2018 bufp += 4096;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002019 sitd->hw_buf_hi[1] = cpu_to_hc32(ehci, bufp >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020 sitd->index = index;
2021}
2022
2023static inline void
2024sitd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_sitd *sitd)
2025{
2026 /* note: sitd ordering could matter (CSPLIT then SSPLIT) */
2027 sitd->sitd_next = ehci->pshadow [frame];
2028 sitd->hw_next = ehci->periodic [frame];
2029 ehci->pshadow [frame].sitd = sitd;
2030 sitd->frame = frame;
2031 wmb ();
Stefan Roese6dbd6822007-05-01 09:29:37 -07002032 ehci->periodic[frame] = cpu_to_hc32(ehci, sitd->sitd_dma | Q_TYPE_SITD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033}
2034
2035/* fit urb's sitds into the selected schedule slot; activate as needed */
2036static int
2037sitd_link_urb (
2038 struct ehci_hcd *ehci,
2039 struct urb *urb,
2040 unsigned mod,
2041 struct ehci_iso_stream *stream
2042)
2043{
2044 int packet;
2045 unsigned next_uframe;
2046 struct ehci_iso_sched *sched = urb->hcpriv;
2047 struct ehci_sitd *sitd;
2048
2049 next_uframe = stream->next_uframe;
2050
2051 if (list_empty(&stream->td_list)) {
2052 /* usbfs ignores TT bandwidth */
2053 ehci_to_hcd(ehci)->self.bandwidth_allocated
2054 += stream->bandwidth;
2055 ehci_vdbg (ehci,
2056 "sched devp %s ep%d%s-iso [%d] %dms/%04x\n",
2057 urb->dev->devpath, stream->bEndpointAddress & 0x0f,
2058 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
Alan Sternbccbefa2010-07-14 11:03:36 -04002059 (next_uframe >> 3) & (ehci->periodic_size - 1),
Stefan Roese6dbd6822007-05-01 09:29:37 -07002060 stream->interval, hc32_to_cpu(ehci, stream->splits));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 }
Alex He05570292010-12-07 10:10:08 +08002062
2063 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08002064 if (ehci->amd_pll_fix == 1)
2065 usb_amd_quirk_pll_disable();
Alex He05570292010-12-07 10:10:08 +08002066 }
2067
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
2069
2070 /* fill sITDs frame by frame */
2071 for (packet = 0, sitd = NULL;
2072 packet < urb->number_of_packets;
2073 packet++) {
2074
2075 /* ASSERT: we have all necessary sitds */
2076 BUG_ON (list_empty (&sched->td_list));
2077
2078 /* ASSERT: no itds for this endpoint in this frame */
2079
2080 sitd = list_entry (sched->td_list.next,
2081 struct ehci_sitd, sitd_list);
2082 list_move_tail (&sitd->sitd_list, &stream->td_list);
2083 sitd->stream = iso_stream_get (stream);
Karsten Wiese508db8c2009-02-26 01:47:48 +01002084 sitd->urb = urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085
Stefan Roese6dbd6822007-05-01 09:29:37 -07002086 sitd_patch(ehci, stream, sitd, sched, packet);
Alan Sternbccbefa2010-07-14 11:03:36 -04002087 sitd_link(ehci, (next_uframe >> 3) & (ehci->periodic_size - 1),
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 sitd);
2089
2090 next_uframe += stream->interval << 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 }
Alan Sternbccbefa2010-07-14 11:03:36 -04002092 stream->next_uframe = next_uframe & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093
2094 /* don't need that schedule data any more */
2095 iso_sched_free (stream, sched);
2096 urb->hcpriv = NULL;
2097
2098 timer_action (ehci, TIMER_IO_WATCHDOG);
David Brownell01c17142008-08-26 23:35:04 -07002099 return enable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100}
2101
2102/*-------------------------------------------------------------------------*/
2103
2104#define SITD_ERRS (SITD_STS_ERR | SITD_STS_DBE | SITD_STS_BABBLE \
David Brownell53bd6a62006-08-30 14:50:06 -07002105 | SITD_STS_XACT | SITD_STS_MMF)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106
David Brownell30bf54e2007-12-16 22:37:40 -08002107/* Process and recycle a completed SITD. Return true iff its urb completed,
2108 * and hence its completion callback probably added things to the hardware
2109 * schedule.
2110 *
2111 * Note that we carefully avoid recycling this descriptor until after any
2112 * completion callback runs, so that it won't be reused quickly. That is,
2113 * assuming (a) no more than two urbs per frame on this endpoint, and also
2114 * (b) only this endpoint's completions submit URBs. It seems some silicon
2115 * corrupts things if you reuse completed descriptors very quickly...
2116 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117static unsigned
2118sitd_complete (
2119 struct ehci_hcd *ehci,
David Howells7d12e782006-10-05 14:55:46 +01002120 struct ehci_sitd *sitd
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121) {
2122 struct urb *urb = sitd->urb;
2123 struct usb_iso_packet_descriptor *desc;
2124 u32 t;
2125 int urb_index = -1;
2126 struct ehci_iso_stream *stream = sitd->stream;
2127 struct usb_device *dev;
David Brownell30bf54e2007-12-16 22:37:40 -08002128 unsigned retval = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129
2130 urb_index = sitd->index;
2131 desc = &urb->iso_frame_desc [urb_index];
Stefan Roese6dbd6822007-05-01 09:29:37 -07002132 t = hc32_to_cpup(ehci, &sitd->hw_results);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133
2134 /* report transfer status */
2135 if (t & SITD_ERRS) {
2136 urb->error_count++;
2137 if (t & SITD_STS_DBE)
2138 desc->status = usb_pipein (urb->pipe)
2139 ? -ENOSR /* hc couldn't read */
2140 : -ECOMM; /* hc couldn't write */
2141 else if (t & SITD_STS_BABBLE)
2142 desc->status = -EOVERFLOW;
2143 else /* XACT, MMF, etc */
2144 desc->status = -EPROTO;
2145 } else {
2146 desc->status = 0;
Alan Sternec6d67e2009-06-29 14:34:59 -04002147 desc->actual_length = desc->length - SITD_LENGTH(t);
2148 urb->actual_length += desc->actual_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150
2151 /* handle completion now? */
2152 if ((urb_index + 1) != urb->number_of_packets)
David Brownell30bf54e2007-12-16 22:37:40 -08002153 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154
2155 /* ASSERT: it's really the last sitd for this urb
2156 list_for_each_entry (sitd, &stream->td_list, sitd_list)
2157 BUG_ON (sitd->urb == urb);
2158 */
2159
David Brownellaa16ca32007-12-30 23:45:19 -08002160 /* give urb back to the driver; completion often (re)submits */
Alan Stern6a8e87b2006-01-19 10:46:27 -05002161 dev = urb->dev;
Alan Stern14c04c02007-08-24 15:40:19 -04002162 ehci_urb_done(ehci, urb, 0);
David Brownell30bf54e2007-12-16 22:37:40 -08002163 retval = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 urb = NULL;
David Brownell01c17142008-08-26 23:35:04 -07002165 (void) disable_periodic(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166 ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
2167
Alex He05570292010-12-07 10:10:08 +08002168 if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) {
Andiry Xuad935622011-03-01 14:57:05 +08002169 if (ehci->amd_pll_fix == 1)
2170 usb_amd_quirk_pll_enable();
Alex He05570292010-12-07 10:10:08 +08002171 }
2172
Karsten Wiese508db8c2009-02-26 01:47:48 +01002173 if (list_is_singular(&stream->td_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174 ehci_to_hcd(ehci)->self.bandwidth_allocated
2175 -= stream->bandwidth;
2176 ehci_vdbg (ehci,
2177 "deschedule devp %s ep%d%s-iso\n",
2178 dev->devpath, stream->bEndpointAddress & 0x0f,
2179 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
2180 }
2181 iso_stream_put (ehci, stream);
Alan Stern0e5f2312010-04-08 16:56:37 -04002182
David Brownell30bf54e2007-12-16 22:37:40 -08002183done:
David Brownell30bf54e2007-12-16 22:37:40 -08002184 sitd->urb = NULL;
Alan Stern0e5f2312010-04-08 16:56:37 -04002185 if (ehci->clock_frame != sitd->frame) {
2186 /* OK to recycle this SITD now. */
2187 sitd->stream = NULL;
2188 list_move(&sitd->sitd_list, &stream->free_list);
2189 iso_stream_put(ehci, stream);
2190 } else {
2191 /* HW might remember this SITD, so we can't recycle it yet.
2192 * Move it to a safe place until a new frame starts.
2193 */
2194 list_move(&sitd->sitd_list, &ehci->cached_sitd_list);
2195 if (stream->refcount == 2) {
2196 /* If iso_stream_put() were called here, stream
2197 * would be freed. Instead, just prevent reuse.
2198 */
2199 stream->ep->hcpriv = NULL;
2200 stream->ep = NULL;
2201 }
2202 }
David Brownell30bf54e2007-12-16 22:37:40 -08002203 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204}
2205
2206
Olav Kongas5db539e2005-06-23 20:25:36 +03002207static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
Al Viro55016f12005-10-21 03:21:58 -04002208 gfp_t mem_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209{
2210 int status = -EINVAL;
2211 unsigned long flags;
2212 struct ehci_iso_stream *stream;
2213
2214 /* Get iso_stream head */
2215 stream = iso_stream_find (ehci, urb);
2216 if (stream == NULL) {
2217 ehci_dbg (ehci, "can't get iso stream\n");
2218 return -ENOMEM;
2219 }
2220 if (urb->interval != stream->interval) {
2221 ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
2222 stream->interval, urb->interval);
2223 goto done;
2224 }
2225
2226#ifdef EHCI_URB_TRACE
2227 ehci_dbg (ehci,
2228 "submit %p dev%s ep%d%s-iso len %d\n",
2229 urb, urb->dev->devpath,
2230 usb_pipeendpoint (urb->pipe),
2231 usb_pipein (urb->pipe) ? "in" : "out",
2232 urb->transfer_buffer_length);
2233#endif
2234
2235 /* allocate SITDs */
2236 status = sitd_urb_transaction (stream, ehci, urb, mem_flags);
2237 if (status < 0) {
2238 ehci_dbg (ehci, "can't init sitds\n");
2239 goto done;
2240 }
2241
2242 /* schedule ... need to lock */
2243 spin_lock_irqsave (&ehci->lock, flags);
Alan Stern541c7d42010-06-22 16:39:10 -04002244 if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +11002245 status = -ESHUTDOWN;
Alan Sterne9df41c2007-08-08 11:48:02 -04002246 goto done_not_linked;
2247 }
2248 status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
2249 if (unlikely(status))
2250 goto done_not_linked;
2251 status = iso_stream_schedule(ehci, urb, stream);
David Brownell53bd6a62006-08-30 14:50:06 -07002252 if (status == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253 sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
Alan Sterne9df41c2007-08-08 11:48:02 -04002254 else
2255 usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
2256done_not_linked:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257 spin_unlock_irqrestore (&ehci->lock, flags);
2258
2259done:
2260 if (status < 0)
2261 iso_stream_put (ehci, stream);
2262 return status;
2263}
2264
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265/*-------------------------------------------------------------------------*/
2266
Alan Stern0e5f2312010-04-08 16:56:37 -04002267static void free_cached_lists(struct ehci_hcd *ehci)
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002268{
2269 struct ehci_itd *itd, *n;
Alan Stern0e5f2312010-04-08 16:56:37 -04002270 struct ehci_sitd *sitd, *sn;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002271
2272 list_for_each_entry_safe(itd, n, &ehci->cached_itd_list, itd_list) {
2273 struct ehci_iso_stream *stream = itd->stream;
2274 itd->stream = NULL;
2275 list_move(&itd->itd_list, &stream->free_list);
2276 iso_stream_put(ehci, stream);
2277 }
Alan Stern0e5f2312010-04-08 16:56:37 -04002278
2279 list_for_each_entry_safe(sitd, sn, &ehci->cached_sitd_list, sitd_list) {
2280 struct ehci_iso_stream *stream = sitd->stream;
2281 sitd->stream = NULL;
2282 list_move(&sitd->sitd_list, &stream->free_list);
2283 iso_stream_put(ehci, stream);
2284 }
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002285}
2286
2287/*-------------------------------------------------------------------------*/
2288
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289static void
David Howells7d12e782006-10-05 14:55:46 +01002290scan_periodic (struct ehci_hcd *ehci)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291{
Alan Sternb40e43f2008-05-20 16:59:10 -04002292 unsigned now_uframe, frame, clock, clock_frame, mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002293 unsigned modified;
2294
2295 mod = ehci->periodic_size << 3;
2296
2297 /*
2298 * When running, scan from last scan point up to "now"
2299 * else clean up by scanning everything that's left.
2300 * Touches as few pages as possible: cache-friendly.
2301 */
2302 now_uframe = ehci->next_uframe;
Alan Sterne8799902011-08-18 16:31:30 -04002303 if (ehci->rh_state == EHCI_RH_RUNNING) {
Alan Stern68aa95d2011-10-12 10:39:14 -04002304 clock = ehci_read_frame_index(ehci);
Alan Sternbccbefa2010-07-14 11:03:36 -04002305 clock_frame = (clock >> 3) & (ehci->periodic_size - 1);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002306 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 clock = now_uframe + mod - 1;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002308 clock_frame = -1;
2309 }
2310 if (ehci->clock_frame != clock_frame) {
Alan Stern0e5f2312010-04-08 16:56:37 -04002311 free_cached_lists(ehci);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002312 ehci->clock_frame = clock_frame;
2313 }
Alan Sternbccbefa2010-07-14 11:03:36 -04002314 clock &= mod - 1;
Alan Sternb40e43f2008-05-20 16:59:10 -04002315 clock_frame = clock >> 3;
Alan Stern1e12c912011-05-17 10:40:51 -04002316 ++ehci->periodic_stamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317
2318 for (;;) {
2319 union ehci_shadow q, *q_p;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002320 __hc32 type, *hw_p;
David Brownell79592b722008-01-07 00:47:42 -08002321 unsigned incomplete = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323 frame = now_uframe >> 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002324
2325restart:
2326 /* scan each element in frame's queue for completions */
2327 q_p = &ehci->pshadow [frame];
2328 hw_p = &ehci->periodic [frame];
2329 q.ptr = q_p->ptr;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002330 type = Q_NEXT_TYPE(ehci, *hw_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331 modified = 0;
2332
2333 while (q.ptr != NULL) {
2334 unsigned uf;
2335 union ehci_shadow temp;
2336 int live;
2337
Alan Sterne8799902011-08-18 16:31:30 -04002338 live = (ehci->rh_state == EHCI_RH_RUNNING);
Stefan Roese6dbd6822007-05-01 09:29:37 -07002339 switch (hc32_to_cpu(ehci, type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 case Q_TYPE_QH:
2341 /* handle any completions */
2342 temp.qh = qh_get (q.qh);
Alek Du3807e262009-07-14 07:23:29 +08002343 type = Q_NEXT_TYPE(ehci, q.qh->hw->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344 q = q.qh->qh_next;
Alan Stern1e12c912011-05-17 10:40:51 -04002345 if (temp.qh->stamp != ehci->periodic_stamp) {
2346 modified = qh_completions(ehci, temp.qh);
2347 if (!modified)
2348 temp.qh->stamp = ehci->periodic_stamp;
2349 if (unlikely(list_empty(&temp.qh->qtd_list) ||
2350 temp.qh->needs_rescan))
2351 intr_deschedule(ehci, temp.qh);
2352 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353 qh_put (temp.qh);
2354 break;
2355 case Q_TYPE_FSTN:
2356 /* for "save place" FSTNs, look at QH entries
2357 * in the previous frame for completions.
2358 */
Stefan Roese6dbd6822007-05-01 09:29:37 -07002359 if (q.fstn->hw_prev != EHCI_LIST_END(ehci)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 dbg ("ignoring completions from FSTNs");
2361 }
Stefan Roese6dbd6822007-05-01 09:29:37 -07002362 type = Q_NEXT_TYPE(ehci, q.fstn->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 q = q.fstn->fstn_next;
2364 break;
2365 case Q_TYPE_ITD:
David Brownell79592b722008-01-07 00:47:42 -08002366 /* If this ITD is still active, leave it for
2367 * later processing ... check the next entry.
Alan Sternb40e43f2008-05-20 16:59:10 -04002368 * No need to check for activity unless the
2369 * frame is current.
David Brownell79592b722008-01-07 00:47:42 -08002370 */
Alan Sternb40e43f2008-05-20 16:59:10 -04002371 if (frame == clock_frame && live) {
2372 rmb();
2373 for (uf = 0; uf < 8; uf++) {
2374 if (q.itd->hw_transaction[uf] &
2375 ITD_ACTIVE(ehci))
2376 break;
2377 }
2378 if (uf < 8) {
2379 incomplete = true;
2380 q_p = &q.itd->itd_next;
2381 hw_p = &q.itd->hw_next;
2382 type = Q_NEXT_TYPE(ehci,
Stefan Roese6dbd6822007-05-01 09:29:37 -07002383 q.itd->hw_next);
Alan Sternb40e43f2008-05-20 16:59:10 -04002384 q = *q_p;
2385 break;
2386 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002388
David Brownell79592b722008-01-07 00:47:42 -08002389 /* Take finished ITDs out of the schedule
2390 * and process them: recycle, maybe report
2391 * URB completion. HC won't cache the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 * pointer for much longer, if at all.
2393 */
2394 *q_p = q.itd->itd_next;
Andiry Xu3d091a62010-11-08 17:58:35 +08002395 if (!ehci->use_dummy_qh ||
2396 q.itd->hw_next != EHCI_LIST_END(ehci))
2397 *hw_p = q.itd->hw_next;
2398 else
2399 *hw_p = ehci->dummy->qh_dma;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002400 type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002401 wmb();
David Howells7d12e782006-10-05 14:55:46 +01002402 modified = itd_complete (ehci, q.itd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 q = *q_p;
2404 break;
2405 case Q_TYPE_SITD:
David Brownell79592b722008-01-07 00:47:42 -08002406 /* If this SITD is still active, leave it for
2407 * later processing ... check the next entry.
Alan Sternb40e43f2008-05-20 16:59:10 -04002408 * No need to check for activity unless the
2409 * frame is current.
David Brownell79592b722008-01-07 00:47:42 -08002410 */
Dmitri Epshtein22e18692009-12-14 17:17:34 +02002411 if (((frame == clock_frame) ||
Alan Sternbccbefa2010-07-14 11:03:36 -04002412 (((frame + 1) & (ehci->periodic_size - 1))
Dmitri Epshtein22e18692009-12-14 17:17:34 +02002413 == clock_frame))
2414 && live
2415 && (q.sitd->hw_results &
2416 SITD_ACTIVE(ehci))) {
2417
David Brownell79592b722008-01-07 00:47:42 -08002418 incomplete = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 q_p = &q.sitd->sitd_next;
2420 hw_p = &q.sitd->hw_next;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002421 type = Q_NEXT_TYPE(ehci,
2422 q.sitd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423 q = *q_p;
2424 break;
2425 }
David Brownell79592b722008-01-07 00:47:42 -08002426
2427 /* Take finished SITDs out of the schedule
2428 * and process them: recycle, maybe report
2429 * URB completion.
2430 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 *q_p = q.sitd->sitd_next;
Andiry Xu3d091a62010-11-08 17:58:35 +08002432 if (!ehci->use_dummy_qh ||
2433 q.sitd->hw_next != EHCI_LIST_END(ehci))
2434 *hw_p = q.sitd->hw_next;
2435 else
2436 *hw_p = ehci->dummy->qh_dma;
Stefan Roese6dbd6822007-05-01 09:29:37 -07002437 type = Q_NEXT_TYPE(ehci, q.sitd->hw_next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 wmb();
David Howells7d12e782006-10-05 14:55:46 +01002439 modified = sitd_complete (ehci, q.sitd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 q = *q_p;
2441 break;
2442 default:
2443 dbg ("corrupt type %d frame %d shadow %p",
2444 type, frame, q.ptr);
2445 // BUG ();
2446 q.ptr = NULL;
2447 }
2448
2449 /* assume completion callbacks modify the queue */
David Brownellaa16ca32007-12-30 23:45:19 -08002450 if (unlikely (modified)) {
2451 if (likely(ehci->periodic_sched > 0))
2452 goto restart;
David Brownell01c17142008-08-26 23:35:04 -07002453 /* short-circuit this scan */
David Brownellaa16ca32007-12-30 23:45:19 -08002454 now_uframe = clock;
2455 break;
2456 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457 }
2458
David Brownell79592b722008-01-07 00:47:42 -08002459 /* If we can tell we caught up to the hardware, stop now.
2460 * We can't advance our scan without collecting the ISO
2461 * transfers that are still pending in this frame.
2462 */
Alan Sterne8799902011-08-18 16:31:30 -04002463 if (incomplete && ehci->rh_state == EHCI_RH_RUNNING) {
David Brownell79592b722008-01-07 00:47:42 -08002464 ehci->next_uframe = now_uframe;
2465 break;
2466 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467
2468 // FIXME: this assumes we won't get lapped when
2469 // latencies climb; that should be rare, but...
2470 // detect it, and just go all the way around.
2471 // FLR might help detect this case, so long as latencies
2472 // don't exceed periodic_size msec (default 1.024 sec).
2473
2474 // FIXME: likewise assumes HC doesn't halt mid-scan
2475
2476 if (now_uframe == clock) {
2477 unsigned now;
2478
Alan Sterne8799902011-08-18 16:31:30 -04002479 if (ehci->rh_state != EHCI_RH_RUNNING
David Brownellaa16ca32007-12-30 23:45:19 -08002480 || ehci->periodic_sched == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481 break;
2482 ehci->next_uframe = now_uframe;
Alan Stern68aa95d2011-10-12 10:39:14 -04002483 now = ehci_read_frame_index(ehci) & (mod - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484 if (now_uframe == now)
2485 break;
2486
2487 /* rescan the rest of this frame, then ... */
2488 clock = now;
Alan Sternb40e43f2008-05-20 16:59:10 -04002489 clock_frame = clock >> 3;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002490 if (ehci->clock_frame != clock_frame) {
Alan Stern0e5f2312010-04-08 16:56:37 -04002491 free_cached_lists(ehci);
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002492 ehci->clock_frame = clock_frame;
Alan Stern1e12c912011-05-17 10:40:51 -04002493 ++ehci->periodic_stamp;
Karsten Wiese9aa09d22009-02-08 16:07:58 -08002494 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495 } else {
2496 now_uframe++;
Alan Sternbccbefa2010-07-14 11:03:36 -04002497 now_uframe &= mod - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498 }
David Brownell53bd6a62006-08-30 14:50:06 -07002499 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500}