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[adm5120] fix a bug in the switch driver, thanks to Thomas Langer for reporting
[openwrt.git] / target / linux / adm5120 / files / drivers / usb / host / adm5120-q.c
1 /*
2 * ADM5120 HCD (Host Controller Driver) for USB
3 *
4 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
5 *
6 * This file was derived from: drivers/usb/host/ohci-q.c
7 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
8 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
9 *
10 * This file is licenced under the GPL.
11 */
12
13 #include <linux/irq.h>
14
15 /*-------------------------------------------------------------------------*/
16
17 /*
18 * URB goes back to driver, and isn't reissued.
19 * It's completely gone from HC data structures.
20 * PRECONDITION: ahcd lock held, irqs blocked.
21 */
22 static void
23 finish_urb(struct admhcd *ahcd, struct urb *urb)
24 __releases(ahcd->lock)
25 __acquires(ahcd->lock)
26 {
27 urb_priv_free(ahcd, urb->hcpriv);
28 urb->hcpriv = NULL;
29
30 spin_lock(&urb->lock);
31 if (likely(urb->status == -EINPROGRESS))
32 urb->status = 0;
33
34 /* report short control reads right even though the data TD always
35 * has TD_R set. (much simpler, but creates the 1-td limit.)
36 */
37 if (unlikely(urb->transfer_flags & URB_SHORT_NOT_OK)
38 && unlikely(usb_pipecontrol(urb->pipe))
39 && urb->actual_length < urb->transfer_buffer_length
40 && usb_pipein(urb->pipe)
41 && urb->status == 0) {
42 urb->status = -EREMOTEIO;
43 #ifdef ADMHC_VERBOSE_DEBUG
44 urb_print(ahcd, urb, "SHORT", usb_pipeout(urb->pipe));
45 #endif
46 }
47 spin_unlock(&urb->lock);
48
49 switch (usb_pipetype(urb->pipe)) {
50 case PIPE_ISOCHRONOUS:
51 admhcd_to_hcd(ahcd)->self.bandwidth_isoc_reqs--;
52 break;
53 case PIPE_INTERRUPT:
54 admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs--;
55 break;
56 }
57
58 #ifdef ADMHC_VERBOSE_DEBUG
59 urb_print(ahcd, urb, "RET", usb_pipeout (urb->pipe));
60 #endif
61
62 /* urb->complete() can reenter this HCD */
63 spin_unlock(&ahcd->lock);
64 usb_hcd_giveback_urb(admhcd_to_hcd(ahcd), urb);
65 spin_lock(&ahcd->lock);
66 }
67
68
69 /*-------------------------------------------------------------------------*
70 * ED handling functions
71 *-------------------------------------------------------------------------*/
72
73 #if 0 /* FIXME */
74 /* search for the right schedule branch to use for a periodic ed.
75 * does some load balancing; returns the branch, or negative errno.
76 */
77 static int balance(struct admhcd *ahcd, int interval, int load)
78 {
79 int i, branch = -ENOSPC;
80
81 /* iso periods can be huge; iso tds specify frame numbers */
82 if (interval > NUM_INTS)
83 interval = NUM_INTS;
84
85 /* search for the least loaded schedule branch of that period
86 * that has enough bandwidth left unreserved.
87 */
88 for (i = 0; i < interval ; i++) {
89 if (branch < 0 || ahcd->load [branch] > ahcd->load [i]) {
90 int j;
91
92 /* usb 1.1 says 90% of one frame */
93 for (j = i; j < NUM_INTS; j += interval) {
94 if ((ahcd->load [j] + load) > 900)
95 break;
96 }
97 if (j < NUM_INTS)
98 continue;
99 branch = i;
100 }
101 }
102 return branch;
103 }
104 #endif
105
106 /*-------------------------------------------------------------------------*/
107
108 #if 0 /* FIXME */
109 /* both iso and interrupt requests have periods; this routine puts them
110 * into the schedule tree in the apppropriate place. most iso devices use
111 * 1msec periods, but that's not required.
112 */
113 static void periodic_link (struct admhcd *ahcd, struct ed *ed)
114 {
115 unsigned i;
116
117 admhc_vdbg (ahcd, "link %sed %p branch %d [%dus.], interval %d\n",
118 (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "",
119 ed, ed->branch, ed->load, ed->interval);
120
121 for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
122 struct ed **prev = &ahcd->periodic [i];
123 __hc32 *prev_p = &ahcd->hcca->int_table [i];
124 struct ed *here = *prev;
125
126 /* sorting each branch by period (slow before fast)
127 * lets us share the faster parts of the tree.
128 * (plus maybe: put interrupt eds before iso)
129 */
130 while (here && ed != here) {
131 if (ed->interval > here->interval)
132 break;
133 prev = &here->ed_next;
134 prev_p = &here->hwNextED;
135 here = *prev;
136 }
137 if (ed != here) {
138 ed->ed_next = here;
139 if (here)
140 ed->hwNextED = *prev_p;
141 wmb ();
142 *prev = ed;
143 *prev_p = cpu_to_hc32(ahcd, ed->dma);
144 wmb();
145 }
146 ahcd->load [i] += ed->load;
147 }
148 admhcd_to_hcd(ahcd)->self.bandwidth_allocated += ed->load / ed->interval;
149 }
150 #endif
151
152 /* link an ed into the HC chain */
153
154 static int ed_schedule(struct admhcd *ahcd, struct ed *ed)
155 {
156 struct ed *old_tail;
157
158 if (admhcd_to_hcd(ahcd)->state == HC_STATE_QUIESCING)
159 return -EAGAIN;
160
161 ed->state = ED_OPER;
162
163 old_tail = ahcd->ed_tails[ed->type];
164
165 ed->ed_next = old_tail->ed_next;
166 if (ed->ed_next) {
167 ed->ed_next->ed_prev = ed;
168 ed->hwNextED = cpu_to_hc32(ahcd, ed->ed_next->dma);
169 }
170 ed->ed_prev = old_tail;
171
172 old_tail->ed_next = ed;
173 old_tail->hwNextED = cpu_to_hc32(ahcd, ed->dma);
174
175 ahcd->ed_tails[ed->type] = ed;
176
177 admhc_dma_enable(ahcd);
178
179 return 0;
180 }
181
182 /*-------------------------------------------------------------------------*/
183
184 #if 0 /* FIXME */
185 /* scan the periodic table to find and unlink this ED */
186 static void periodic_unlink (struct admhcd *ahcd, struct ed *ed)
187 {
188 int i;
189
190 for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
191 struct ed *temp;
192 struct ed **prev = &ahcd->periodic [i];
193 __hc32 *prev_p = &ahcd->hcca->int_table [i];
194
195 while (*prev && (temp = *prev) != ed) {
196 prev_p = &temp->hwNextED;
197 prev = &temp->ed_next;
198 }
199 if (*prev) {
200 *prev_p = ed->hwNextED;
201 *prev = ed->ed_next;
202 }
203 ahcd->load [i] -= ed->load;
204 }
205
206 admhcd_to_hcd(ahcd)->self.bandwidth_allocated -= ed->load / ed->interval;
207 admhc_vdbg (ahcd, "unlink %sed %p branch %d [%dus.], interval %d\n",
208 (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "",
209 ed, ed->branch, ed->load, ed->interval);
210 }
211 #endif
212
213 /* unlink an ed from the HC chain.
214 * just the link to the ed is unlinked.
215 * the link from the ed still points to another operational ed or 0
216 * so the HC can eventually finish the processing of the unlinked ed
217 * (assuming it already started that, which needn't be true).
218 *
219 * ED_UNLINK is a transient state: the HC may still see this ED, but soon
220 * it won't. ED_SKIP means the HC will finish its current transaction,
221 * but won't start anything new. The TD queue may still grow; device
222 * drivers don't know about this HCD-internal state.
223 *
224 * When the HC can't see the ED, something changes ED_UNLINK to one of:
225 *
226 * - ED_OPER: when there's any request queued, the ED gets rescheduled
227 * immediately. HC should be working on them.
228 *
229 * - ED_IDLE: when there's no TD queue. there's no reason for the HC
230 * to care about this ED; safe to disable the endpoint.
231 *
232 * When finish_unlinks() runs later, after SOF interrupt, it will often
233 * complete one or more URB unlinks before making that state change.
234 */
235 static void ed_deschedule(struct admhcd *ahcd, struct ed *ed)
236 {
237
238 #ifdef ADMHC_VERBOSE_DEBUG
239 admhc_dump_ed(ahcd, "ED-DESCHED", ed, 1);
240 #endif
241
242 ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
243 wmb();
244 ed->state = ED_UNLINK;
245
246 /* remove this ED from the HC list */
247 ed->ed_prev->hwNextED = ed->hwNextED;
248
249 /* and remove it from our list also */
250 ed->ed_prev->ed_next = ed->ed_next;
251
252 if (ed->ed_next)
253 ed->ed_next->ed_prev = ed->ed_prev;
254
255 if (ahcd->ed_tails[ed->type] == ed)
256 ahcd->ed_tails[ed->type] = ed->ed_prev;
257 }
258
259 /*-------------------------------------------------------------------------*/
260
261 static struct ed *ed_create(struct admhcd *ahcd, unsigned int type, u32 info)
262 {
263 struct ed *ed;
264 struct td *td;
265
266 ed = ed_alloc(ahcd, GFP_ATOMIC);
267 if (!ed)
268 goto err;
269
270 /* dummy td; end of td list for this ed */
271 td = td_alloc(ahcd, GFP_ATOMIC);
272 if (!td)
273 goto err_free_ed;
274
275 switch (type) {
276 case PIPE_INTERRUPT:
277 info |= ED_INT;
278 break;
279 case PIPE_ISOCHRONOUS:
280 info |= ED_ISO;
281 break;
282 }
283
284 ed->dummy = td;
285 ed->state = ED_IDLE;
286 ed->type = type;
287
288 ed->hwINFO = cpu_to_hc32(ahcd, info);
289 ed->hwTailP = cpu_to_hc32(ahcd, td->td_dma);
290 ed->hwHeadP = ed->hwTailP; /* ED_C, ED_H zeroed */
291
292 return ed;
293
294 err_free_ed:
295 ed_free(ahcd, ed);
296 err:
297 return NULL;
298 }
299
300 /* get and maybe (re)init an endpoint. init _should_ be done only as part
301 * of enumeration, usb_set_configuration() or usb_set_interface().
302 */
303 static struct ed *ed_get(struct admhcd *ahcd, struct usb_host_endpoint *ep,
304 struct usb_device *udev, unsigned int pipe, int interval)
305 {
306 struct ed *ed;
307 unsigned long flags;
308
309 spin_lock_irqsave(&ahcd->lock, flags);
310
311 ed = ep->hcpriv;
312 if (!ed) {
313 u32 info;
314
315 /* FIXME: usbcore changes dev->devnum before SET_ADDRESS
316 * suceeds ... otherwise we wouldn't need "pipe".
317 */
318 info = usb_pipedevice(pipe);
319 info |= (ep->desc.bEndpointAddress & ~USB_DIR_IN) << ED_EN_SHIFT;
320 info |= le16_to_cpu(ep->desc.wMaxPacketSize) << ED_MPS_SHIFT;
321 if (udev->speed == USB_SPEED_FULL)
322 info |= ED_SPEED_FULL;
323
324 ed = ed_create(ahcd, usb_pipetype(pipe), info);
325 if (ed)
326 ep->hcpriv = ed;
327 }
328
329 spin_unlock_irqrestore(&ahcd->lock, flags);
330
331 return ed;
332 }
333
334 /*-------------------------------------------------------------------------*/
335
336 /* request unlinking of an endpoint from an operational HC.
337 * put the ep on the rm_list
338 * real work is done at the next start frame (SOFI) hardware interrupt
339 * caller guarantees HCD is running, so hardware access is safe,
340 * and that ed->state is ED_OPER
341 */
342 static void start_ed_unlink(struct admhcd *ahcd, struct ed *ed)
343 {
344
345 #ifdef ADMHC_VERBOSE_DEBUG
346 admhc_dump_ed(ahcd, "ED-UNLINK", ed, 1);
347 #endif
348
349 ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE);
350 ed_deschedule(ahcd, ed);
351
352 /* add this ED into the remove list */
353 ed->ed_rm_next = ahcd->ed_rm_list;
354 ahcd->ed_rm_list = ed;
355
356 /* enable SOF interrupt */
357 admhc_intr_ack(ahcd, ADMHC_INTR_SOFI);
358 admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
359 /* flush those writes */
360 admhc_writel_flush(ahcd);
361
362 /* SOF interrupt might get delayed; record the frame counter value that
363 * indicates when the HC isn't looking at it, so concurrent unlinks
364 * behave. frame_no wraps every 2^16 msec, and changes right before
365 * SOF is triggered.
366 */
367 ed->tick = admhc_frame_no(ahcd) + 1;
368 }
369
370 /*-------------------------------------------------------------------------*
371 * TD handling functions
372 *-------------------------------------------------------------------------*/
373
374 /* enqueue next TD for this URB (OHCI spec 5.2.8.2) */
375
376 static void
377 td_fill(struct admhcd *ahcd, u32 info, dma_addr_t data, int len,
378 struct urb *urb, int index)
379 {
380 struct td *td, *td_pt;
381 struct urb_priv *urb_priv = urb->hcpriv;
382 int hash;
383 u32 cbl = 0;
384
385 #if 1
386 if (index == (urb_priv->td_cnt - 1) &&
387 ((urb->transfer_flags & URB_NO_INTERRUPT) == 0))
388 cbl |= TD_IE;
389 #else
390 if (index == (urb_priv->td_cnt - 1))
391 cbl |= TD_IE;
392 #endif
393
394 /* use this td as the next dummy */
395 td_pt = urb_priv->td[index];
396
397 /* fill the old dummy TD */
398 td = urb_priv->td[index] = urb_priv->ed->dummy;
399 urb_priv->ed->dummy = td_pt;
400
401 td->ed = urb_priv->ed;
402 td->next_dl_td = NULL;
403 td->index = index;
404 td->urb = urb;
405 td->data_dma = data;
406 if (!len)
407 data = 0;
408
409 if (data)
410 cbl |= (len & TD_BL_MASK);
411
412 info |= TD_OWN;
413
414 /* setup hardware specific fields */
415 td->hwINFO = cpu_to_hc32(ahcd, info);
416 td->hwDBP = cpu_to_hc32(ahcd, data);
417 td->hwCBL = cpu_to_hc32(ahcd, cbl);
418 td->hwNextTD = cpu_to_hc32(ahcd, td_pt->td_dma);
419
420 /* append to queue */
421 list_add_tail(&td->td_list, &td->ed->td_list);
422
423 /* hash it for later reverse mapping */
424 hash = TD_HASH_FUNC(td->td_dma);
425 td->td_hash = ahcd->td_hash[hash];
426 ahcd->td_hash[hash] = td;
427
428 /* HC might read the TD (or cachelines) right away ... */
429 wmb();
430 td->ed->hwTailP = td->hwNextTD;
431 }
432
433 /*-------------------------------------------------------------------------*/
434
435 /* Prepare all TDs of a transfer, and queue them onto the ED.
436 * Caller guarantees HC is active.
437 * Usually the ED is already on the schedule, so TDs might be
438 * processed as soon as they're queued.
439 */
440 static void td_submit_urb(struct admhcd *ahcd, struct urb *urb)
441 {
442 struct urb_priv *urb_priv = urb->hcpriv;
443 dma_addr_t data;
444 int data_len = urb->transfer_buffer_length;
445 int cnt = 0;
446 u32 info = 0;
447 int is_out = usb_pipeout(urb->pipe);
448 u32 toggle = 0;
449
450 /* OHCI handles the bulk/interrupt data toggles itself. We just
451 * use the device toggle bits for resetting, and rely on the fact
452 * that resetting toggle is meaningless if the endpoint is active.
453 */
454
455 if (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), is_out)) {
456 toggle = TD_T_CARRY;
457 } else {
458 toggle = TD_T_DATA0;
459 usb_settoggle(urb->dev, usb_pipeendpoint (urb->pipe),
460 is_out, 1);
461 }
462
463 urb_priv->td_idx = 0;
464 list_add(&urb_priv->pending, &ahcd->pending);
465
466 if (data_len)
467 data = urb->transfer_dma;
468 else
469 data = 0;
470
471 /* NOTE: TD_CC is set so we can tell which TDs the HC processed by
472 * using TD_CC_GET, as well as by seeing them on the done list.
473 * (CC = NotAccessed ... 0x0F, or 0x0E in PSWs for ISO.)
474 */
475 switch (urb_priv->ed->type) {
476 case PIPE_INTERRUPT:
477 info = is_out
478 ? TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_OUT
479 : TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_IN;
480
481 /* setup service interval and starting frame number */
482 info |= (urb->start_frame & TD_FN_MASK);
483 info |= (urb->interval & TD_ISI_MASK) << TD_ISI_SHIFT;
484
485 td_fill(ahcd, info, data, data_len, urb, cnt);
486 cnt++;
487
488 admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs++;
489 break;
490
491 case PIPE_BULK:
492 info = is_out
493 ? TD_SCC_NOTACCESSED | TD_DP_OUT
494 : TD_SCC_NOTACCESSED | TD_DP_IN;
495
496 /* TDs _could_ transfer up to 8K each */
497 while (data_len > TD_DATALEN_MAX) {
498 td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle),
499 data, TD_DATALEN_MAX, urb, cnt);
500 data += TD_DATALEN_MAX;
501 data_len -= TD_DATALEN_MAX;
502 cnt++;
503 }
504
505 td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), data,
506 data_len, urb, cnt);
507 cnt++;
508
509 if ((urb->transfer_flags & URB_ZERO_PACKET)
510 && (cnt < urb_priv->td_cnt)) {
511 td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle),
512 0, 0, urb, cnt);
513 cnt++;
514 }
515 break;
516
517 /* control manages DATA0/DATA1 toggle per-request; SETUP resets it,
518 * any DATA phase works normally, and the STATUS ack is special.
519 */
520 case PIPE_CONTROL:
521 /* fill a TD for the setup */
522 info = TD_SCC_NOTACCESSED | TD_DP_SETUP | TD_T_DATA0;
523 td_fill(ahcd, info, urb->setup_dma, 8, urb, cnt++);
524
525 if (data_len > 0) {
526 /* fill a TD for the data */
527 info = TD_SCC_NOTACCESSED | TD_T_DATA1;
528 info |= is_out ? TD_DP_OUT : TD_DP_IN;
529 /* NOTE: mishandles transfers >8K, some >4K */
530 td_fill(ahcd, info, data, data_len, urb, cnt++);
531 }
532
533 /* fill a TD for the ACK */
534 info = (is_out || data_len == 0)
535 ? TD_SCC_NOTACCESSED | TD_DP_IN | TD_T_DATA1
536 : TD_SCC_NOTACCESSED | TD_DP_OUT | TD_T_DATA1;
537 td_fill(ahcd, info, data, 0, urb, cnt++);
538
539 break;
540
541 /* ISO has no retransmit, so no toggle;
542 * Each TD could handle multiple consecutive frames (interval 1);
543 * we could often reduce the number of TDs here.
544 */
545 case PIPE_ISOCHRONOUS:
546 info = TD_SCC_NOTACCESSED;
547 for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
548 int frame = urb->start_frame;
549
550 frame += cnt * urb->interval;
551 frame &= TD_FN_MASK;
552 td_fill(ahcd, info | frame,
553 data + urb->iso_frame_desc[cnt].offset,
554 urb->iso_frame_desc[cnt].length, urb, cnt);
555 }
556 admhcd_to_hcd(ahcd)->self.bandwidth_isoc_reqs++;
557 break;
558 }
559
560 if (urb_priv->td_cnt != cnt)
561 admhc_err(ahcd, "bad number of tds created for urb %p\n", urb);
562 }
563
564 /*-------------------------------------------------------------------------*
565 * Done List handling functions
566 *-------------------------------------------------------------------------*/
567
568 /* calculate transfer length/status and update the urb
569 * PRECONDITION: irqsafe (only for urb->status locking)
570 */
571 static int td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
572 {
573 struct urb_priv *urb_priv = urb->hcpriv;
574 u32 info = hc32_to_cpup(ahcd, &td->hwINFO);
575 int type = usb_pipetype(urb->pipe);
576 int cc;
577
578 cc = TD_CC_GET(info);
579
580 /* ISO ... drivers see per-TD length/status */
581 if (type == PIPE_ISOCHRONOUS) {
582 #if 0
583 /* TODO */
584 int dlen = 0;
585
586 /* NOTE: assumes FC in tdINFO == 0, and that
587 * only the first of 0..MAXPSW psws is used.
588 */
589
590 cc = TD_CC_GET(td);
591 if (tdINFO & TD_CC) /* hc didn't touch? */
592 return;
593
594 if (usb_pipeout (urb->pipe))
595 dlen = urb->iso_frame_desc [td->index].length;
596 else {
597 /* short reads are always OK for ISO */
598 if (cc == TD_DATAUNDERRUN)
599 cc = TD_CC_NOERROR;
600 dlen = tdPSW & 0x3ff;
601 }
602 urb->actual_length += dlen;
603 urb->iso_frame_desc [td->index].actual_length = dlen;
604 urb->iso_frame_desc [td->index].status = cc_to_error [cc];
605
606 if (cc != TD_CC_NOERROR)
607 admhc_vdbg (ahcd,
608 "urb %p iso td %p (%d) len %d cc %d\n",
609 urb, td, 1 + td->index, dlen, cc);
610 #endif
611 /* BULK, INT, CONTROL ... drivers see aggregate length/status,
612 * except that "setup" bytes aren't counted and "short" transfers
613 * might not be reported as errors.
614 */
615 } else {
616 u32 bl = TD_BL_GET(hc32_to_cpup(ahcd, &td->hwCBL));
617 u32 tdDBP = hc32_to_cpup(ahcd, &td->hwDBP);
618
619 /* update packet status if needed (short is normally ok) */
620 if (cc == TD_CC_DATAUNDERRUN
621 && !(urb->transfer_flags & URB_SHORT_NOT_OK))
622 cc = TD_CC_NOERROR;
623
624 if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0) {
625 spin_lock(&urb->lock);
626 if (urb->status == -EINPROGRESS)
627 urb->status = cc_to_error[cc];
628 spin_unlock(&urb->lock);
629 }
630
631 /* count all non-empty packets except control SETUP packet */
632 if ((type != PIPE_CONTROL || td->index != 0) && tdDBP != 0) {
633 urb->actual_length += tdDBP - td->data_dma + bl;
634 }
635
636 if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0)
637 admhc_vdbg(ahcd,
638 "urb %p td %p (%d) cc %d, len=%d/%d\n",
639 urb, td, td->index, cc,
640 urb->actual_length,
641 urb->transfer_buffer_length);
642 }
643
644 list_del(&td->td_list);
645 urb_priv->td_idx++;
646
647 return cc;
648 }
649
650 /*-------------------------------------------------------------------------*/
651
652 static inline struct td *
653 ed_halted(struct admhcd *ahcd, struct td *td, int cc, struct td *rev)
654 {
655 struct urb *urb = td->urb;
656 struct ed *ed = td->ed;
657 struct list_head *tmp = td->td_list.next;
658 __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C);
659
660 admhc_dump_ed(ahcd, "ed halted", td->ed, 1);
661 /* clear ed halt; this is the td that caused it, but keep it inactive
662 * until its urb->complete() has a chance to clean up.
663 */
664 ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
665 wmb();
666 ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H);
667
668 /* put any later tds from this urb onto the donelist, after 'td',
669 * order won't matter here: no errors, and nothing was transferred.
670 * also patch the ed so it looks as if those tds completed normally.
671 */
672 while (tmp != &ed->td_list) {
673 struct td *next;
674 __hc32 info;
675
676 next = list_entry(tmp, struct td, td_list);
677 tmp = next->td_list.next;
678
679 if (next->urb != urb)
680 break;
681
682 /* NOTE: if multi-td control DATA segments get supported,
683 * this urb had one of them, this td wasn't the last td
684 * in that segment (TD_R clear), this ed halted because
685 * of a short read, _and_ URB_SHORT_NOT_OK is clear ...
686 * then we need to leave the control STATUS packet queued
687 * and clear ED_SKIP.
688 */
689 info = next->hwINFO;
690 #if 0 /* FIXME */
691 info |= cpu_to_hc32(ahcd, TD_DONE);
692 #endif
693 info &= ~cpu_to_hc32(ahcd, TD_CC);
694 next->hwINFO = info;
695
696 next->next_dl_td = rev;
697 rev = next;
698
699 ed->hwHeadP = next->hwNextTD | toggle;
700 }
701
702 /* help for troubleshooting: report anything that
703 * looks odd ... that doesn't include protocol stalls
704 * (or maybe some other things)
705 */
706 switch (cc) {
707 case TD_CC_DATAUNDERRUN:
708 if ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0)
709 break;
710 /* fallthrough */
711 case TD_CC_STALL:
712 if (usb_pipecontrol(urb->pipe))
713 break;
714 /* fallthrough */
715 default:
716 admhc_dbg (ahcd,
717 "urb %p path %s ep%d%s %08x cc %d --> status %d\n",
718 urb, urb->dev->devpath,
719 usb_pipeendpoint (urb->pipe),
720 usb_pipein (urb->pipe) ? "in" : "out",
721 hc32_to_cpu(ahcd, td->hwINFO),
722 cc, cc_to_error [cc]);
723 }
724
725 return rev;
726 }
727
728 /*-------------------------------------------------------------------------*/
729
730 /* there are some urbs/eds to unlink; called in_irq(), with HCD locked */
731 static void
732 finish_unlinks(struct admhcd *ahcd, u16 tick)
733 {
734 struct ed *ed, **last;
735
736 rescan_all:
737 for (last = &ahcd->ed_rm_list, ed = *last; ed != NULL; ed = *last) {
738 struct list_head *entry, *tmp;
739 int completed, modified;
740 __hc32 *prev;
741
742 /* only take off EDs that the HC isn't using, accounting for
743 * frame counter wraps and EDs with partially retired TDs
744 */
745 if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))) {
746 if (tick_before (tick, ed->tick)) {
747 skip_ed:
748 last = &ed->ed_rm_next;
749 continue;
750 }
751 #if 0
752 if (!list_empty(&ed->td_list)) {
753 struct td *td;
754 u32 head;
755
756 td = list_entry(ed->td_list.next, struct td,
757 td_list);
758 head = hc32_to_cpu(ahcd, ed->hwHeadP) &
759 TD_MASK;
760
761 /* INTR_WDH may need to clean up first */
762 if (td->td_dma != head)
763 goto skip_ed;
764 }
765 #endif
766 }
767
768 /* reentrancy: if we drop the schedule lock, someone might
769 * have modified this list. normally it's just prepending
770 * entries (which we'd ignore), but paranoia won't hurt.
771 */
772 *last = ed->ed_rm_next;
773 ed->ed_rm_next = NULL;
774 modified = 0;
775
776 /* unlink urbs as requested, but rescan the list after
777 * we call a completion since it might have unlinked
778 * another (earlier) urb
779 *
780 * When we get here, the HC doesn't see this ed. But it
781 * must not be rescheduled until all completed URBs have
782 * been given back to the driver.
783 */
784 rescan_this:
785 completed = 0;
786 prev = &ed->hwHeadP;
787 list_for_each_safe(entry, tmp, &ed->td_list) {
788 struct td *td;
789 struct urb *urb;
790 struct urb_priv *urb_priv;
791 __hc32 savebits;
792
793 td = list_entry(entry, struct td, td_list);
794 urb = td->urb;
795 urb_priv = td->urb->hcpriv;
796
797 if (urb->status == -EINPROGRESS) {
798 prev = &td->hwNextTD;
799 continue;
800 }
801
802 if ((urb_priv) == NULL)
803 continue;
804
805 /* patch pointer hc uses */
806 savebits = *prev & ~cpu_to_hc32(ahcd, TD_MASK);
807 *prev = td->hwNextTD | savebits;
808
809 /* HC may have partly processed this TD */
810 #ifdef ADMHC_VERBOSE_DEBUG
811 urb_print(ahcd, urb, "PARTIAL", 0);
812 #endif
813 td_done(ahcd, urb, td);
814
815 /* if URB is done, clean up */
816 if (urb_priv->td_idx == urb_priv->td_cnt) {
817 modified = completed = 1;
818 finish_urb(ahcd, urb);
819 }
820 }
821 if (completed && !list_empty(&ed->td_list))
822 goto rescan_this;
823
824 /* ED's now officially unlinked, hc doesn't see */
825 ed->state = ED_IDLE;
826 ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H);
827 ed->hwNextED = 0;
828 wmb();
829 ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP | ED_DEQUEUE);
830
831 /* but if there's work queued, reschedule */
832 if (!list_empty(&ed->td_list)) {
833 if (HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))
834 ed_schedule(ahcd, ed);
835 }
836
837 if (modified)
838 goto rescan_all;
839 }
840 }
841
842 /*-------------------------------------------------------------------------*/
843
844 /*
845 * Process normal completions (error or success) and clean the schedules.
846 *
847 * This is the main path for handing urbs back to drivers. The only other
848 * path is finish_unlinks(), which unlinks URBs using ed_rm_list, instead of
849 * scanning the (re-reversed) donelist as this does.
850 */
851
852 static void ed_unhalt(struct admhcd *ahcd, struct ed *ed, struct urb *urb)
853 {
854 struct list_head *entry,*tmp;
855 __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C);
856
857 #ifdef ADMHC_VERBOSE_DEBUG
858 admhc_dump_ed(ahcd, "UNHALT", ed, 0);
859 #endif
860 /* clear ed halt; this is the td that caused it, but keep it inactive
861 * until its urb->complete() has a chance to clean up.
862 */
863 ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
864 wmb();
865 ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H);
866
867 list_for_each_safe(entry, tmp, &ed->td_list) {
868 struct td *td = list_entry(entry, struct td, td_list);
869 __hc32 info;
870
871 if (td->urb != urb)
872 break;
873
874 info = td->hwINFO;
875 info &= ~cpu_to_hc32(ahcd, TD_CC | TD_OWN);
876 td->hwINFO = info;
877
878 ed->hwHeadP = td->hwNextTD | toggle;
879 wmb();
880 }
881
882 }
883
884 static void ed_intr_refill(struct admhcd *ahcd, struct ed *ed)
885 {
886 __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C);
887
888 ed->hwHeadP = ed->hwTailP | toggle;
889 }
890
891
892 static inline int is_ed_halted(struct admhcd *ahcd, struct ed *ed)
893 {
894 return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) == ED_H);
895 }
896
897 static inline int is_td_halted(struct admhcd *ahcd, struct ed *ed,
898 struct td *td)
899 {
900 return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & TD_MASK) ==
901 (hc32_to_cpup(ahcd, &td->hwNextTD) & TD_MASK));
902 }
903
904 static void ed_update(struct admhcd *ahcd, struct ed *ed)
905 {
906 struct list_head *entry,*tmp;
907
908 #ifdef ADMHC_VERBOSE_DEBUG
909 admhc_dump_ed(ahcd, "UPDATE", ed, 1);
910 #endif
911
912 list_for_each_safe(entry, tmp, &ed->td_list) {
913 struct td *td = list_entry(entry, struct td, td_list);
914 struct urb *urb = td->urb;
915 struct urb_priv *urb_priv = urb->hcpriv;
916 int cc;
917
918 if (hc32_to_cpup(ahcd, &td->hwINFO) & TD_OWN)
919 break;
920
921 /* update URB's length and status from TD */
922 cc = td_done(ahcd, urb, td);
923 if (is_ed_halted(ahcd, ed) && is_td_halted(ahcd, ed, td))
924 ed_unhalt(ahcd, ed, urb);
925
926 if (ed->type == PIPE_INTERRUPT)
927 ed_intr_refill(ahcd,ed);
928
929 /* If all this urb's TDs are done, call complete() */
930 if (urb_priv->td_idx == urb_priv->td_cnt)
931 finish_urb(ahcd, urb);
932
933 /* clean schedule: unlink EDs that are no longer busy */
934 if (list_empty(&ed->td_list)) {
935 if (ed->state == ED_OPER)
936 start_ed_unlink(ahcd, ed);
937
938 /* ... reenabling halted EDs only after fault cleanup */
939 } else if ((ed->hwINFO & cpu_to_hc32(ahcd,
940 ED_SKIP | ED_DEQUEUE))
941 == cpu_to_hc32(ahcd, ED_SKIP)) {
942 td = list_entry(ed->td_list.next, struct td, td_list);
943 #if 0
944 if (!(td->hwINFO & cpu_to_hc32(ahcd, TD_DONE))) {
945 ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
946 /* ... hc may need waking-up */
947 switch (ed->type) {
948 case PIPE_CONTROL:
949 admhc_writel (ahcd, OHCI_CLF,
950 &ahcd->regs->cmdstatus);
951 break;
952 case PIPE_BULK:
953 admhc_writel (ahcd, OHCI_BLF,
954 &ahcd->regs->cmdstatus);
955 break;
956 }
957 }
958 #else
959 if ((td->hwINFO & cpu_to_hc32(ahcd, TD_OWN)))
960 ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
961 #endif
962 }
963
964 }
965 }
966
967 /* there are some tds completed; called in_irq(), with HCD locked */
968 static void admhc_td_complete(struct admhcd *ahcd)
969 {
970 struct ed *ed;
971
972 for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
973 if (ed->state != ED_OPER)
974 continue;
975
976 ed_update(ahcd, ed);
977 }
978 }
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