]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
d49d4317 | 2 | * Copyright (C) 2001-2004 by David Brownell |
53bd6a60 | 3 | * |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or modify it |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or (at your | |
7 | * option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software Foundation, | |
16 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
17 | */ | |
18 | ||
19 | /* this file is part of ehci-hcd.c */ | |
20 | ||
21 | /*-------------------------------------------------------------------------*/ | |
22 | ||
23 | /* | |
24 | * EHCI hardware queue manipulation ... the core. QH/QTD manipulation. | |
25 | * | |
26 | * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd" | |
27 | * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned | |
28 | * buffers needed for the larger number). We use one QH per endpoint, queue | |
29 | * multiple urbs (all three types) per endpoint. URBs may need several qtds. | |
30 | * | |
31 | * ISO traffic uses "ISO TD" (itd, and sitd) records, and (along with | |
32 | * interrupts) needs careful scheduling. Performance improvements can be | |
33 | * an ongoing challenge. That's in "ehci-sched.c". | |
53bd6a60 | 34 | * |
1da177e4 LT |
35 | * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs, |
36 | * or otherwise through transaction translators (TTs) in USB 2.0 hubs using | |
37 | * (b) special fields in qh entries or (c) split iso entries. TTs will | |
38 | * buffer low/full speed data so the host collects it at high speed. | |
39 | */ | |
40 | ||
41 | /*-------------------------------------------------------------------------*/ | |
42 | ||
43 | /* fill a qtd, returning how much of the buffer we were able to queue up */ | |
44 | ||
45 | static int | |
6dbd682b SR |
46 | qtd_fill(struct ehci_hcd *ehci, struct ehci_qtd *qtd, dma_addr_t buf, |
47 | size_t len, int token, int maxpacket) | |
1da177e4 LT |
48 | { |
49 | int i, count; | |
50 | u64 addr = buf; | |
51 | ||
52 | /* one buffer entry per 4K ... first might be short or unaligned */ | |
6dbd682b SR |
53 | qtd->hw_buf[0] = cpu_to_hc32(ehci, (u32)addr); |
54 | qtd->hw_buf_hi[0] = cpu_to_hc32(ehci, (u32)(addr >> 32)); | |
1da177e4 LT |
55 | count = 0x1000 - (buf & 0x0fff); /* rest of that page */ |
56 | if (likely (len < count)) /* ... iff needed */ | |
57 | count = len; | |
58 | else { | |
59 | buf += 0x1000; | |
60 | buf &= ~0x0fff; | |
61 | ||
62 | /* per-qtd limit: from 16K to 20K (best alignment) */ | |
63 | for (i = 1; count < len && i < 5; i++) { | |
64 | addr = buf; | |
6dbd682b SR |
65 | qtd->hw_buf[i] = cpu_to_hc32(ehci, (u32)addr); |
66 | qtd->hw_buf_hi[i] = cpu_to_hc32(ehci, | |
67 | (u32)(addr >> 32)); | |
1da177e4 LT |
68 | buf += 0x1000; |
69 | if ((count + 0x1000) < len) | |
70 | count += 0x1000; | |
71 | else | |
72 | count = len; | |
73 | } | |
74 | ||
75 | /* short packets may only terminate transfers */ | |
76 | if (count != len) | |
77 | count -= (count % maxpacket); | |
78 | } | |
6dbd682b | 79 | qtd->hw_token = cpu_to_hc32(ehci, (count << 16) | token); |
1da177e4 LT |
80 | qtd->length = count; |
81 | ||
82 | return count; | |
83 | } | |
84 | ||
85 | /*-------------------------------------------------------------------------*/ | |
86 | ||
87 | static inline void | |
88 | qh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd) | |
89 | { | |
3807e26d AD |
90 | struct ehci_qh_hw *hw = qh->hw; |
91 | ||
1da177e4 LT |
92 | /* writes to an active overlay are unsafe */ |
93 | BUG_ON(qh->qh_state != QH_STATE_IDLE); | |
94 | ||
3807e26d AD |
95 | hw->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma); |
96 | hw->hw_alt_next = EHCI_LIST_END(ehci); | |
1da177e4 | 97 | |
a455212d AS |
98 | /* Except for control endpoints, we make hardware maintain data |
99 | * toggle (like OHCI) ... here (re)initialize the toggle in the QH, | |
100 | * and set the pseudo-toggle in udev. Only usb_clear_halt() will | |
101 | * ever clear it. | |
102 | */ | |
4c53de72 | 103 | if (!(hw->hw_info1 & cpu_to_hc32(ehci, QH_TOGGLE_CTL))) { |
a455212d AS |
104 | unsigned is_out, epnum; |
105 | ||
e04f5f7e | 106 | is_out = qh->is_out; |
3807e26d | 107 | epnum = (hc32_to_cpup(ehci, &hw->hw_info1) >> 8) & 0x0f; |
a455212d | 108 | if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) { |
3807e26d | 109 | hw->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE); |
a455212d AS |
110 | usb_settoggle (qh->dev, epnum, is_out, 1); |
111 | } | |
112 | } | |
113 | ||
3807e26d | 114 | hw->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING); |
1da177e4 LT |
115 | } |
116 | ||
117 | /* if it weren't for a common silicon quirk (writing the dummy into the qh | |
118 | * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault | |
119 | * recovery (including urb dequeue) would need software changes to a QH... | |
120 | */ | |
121 | static void | |
122 | qh_refresh (struct ehci_hcd *ehci, struct ehci_qh *qh) | |
123 | { | |
124 | struct ehci_qtd *qtd; | |
125 | ||
126 | if (list_empty (&qh->qtd_list)) | |
127 | qtd = qh->dummy; | |
128 | else { | |
129 | qtd = list_entry (qh->qtd_list.next, | |
130 | struct ehci_qtd, qtd_list); | |
131 | /* first qtd may already be partially processed */ | |
3807e26d | 132 | if (cpu_to_hc32(ehci, qtd->qtd_dma) == qh->hw->hw_current) |
1da177e4 LT |
133 | qtd = NULL; |
134 | } | |
135 | ||
136 | if (qtd) | |
137 | qh_update (ehci, qh, qtd); | |
138 | } | |
139 | ||
140 | /*-------------------------------------------------------------------------*/ | |
141 | ||
914b7012 AS |
142 | static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh); |
143 | ||
144 | static void ehci_clear_tt_buffer_complete(struct usb_hcd *hcd, | |
145 | struct usb_host_endpoint *ep) | |
146 | { | |
147 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
148 | struct ehci_qh *qh = ep->hcpriv; | |
149 | unsigned long flags; | |
150 | ||
151 | spin_lock_irqsave(&ehci->lock, flags); | |
152 | qh->clearing_tt = 0; | |
153 | if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list) | |
e8799906 | 154 | && ehci->rh_state == EHCI_RH_RUNNING) |
914b7012 AS |
155 | qh_link_async(ehci, qh); |
156 | spin_unlock_irqrestore(&ehci->lock, flags); | |
157 | } | |
158 | ||
159 | static void ehci_clear_tt_buffer(struct ehci_hcd *ehci, struct ehci_qh *qh, | |
160 | struct urb *urb, u32 token) | |
161 | { | |
162 | ||
163 | /* If an async split transaction gets an error or is unlinked, | |
164 | * the TT buffer may be left in an indeterminate state. We | |
165 | * have to clear the TT buffer. | |
166 | * | |
167 | * Note: this routine is never called for Isochronous transfers. | |
168 | */ | |
169 | if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) { | |
170 | #ifdef DEBUG | |
171 | struct usb_device *tt = urb->dev->tt->hub; | |
172 | dev_dbg(&tt->dev, | |
173 | "clear tt buffer port %d, a%d ep%d t%08x\n", | |
174 | urb->dev->ttport, urb->dev->devnum, | |
175 | usb_pipeendpoint(urb->pipe), token); | |
176 | #endif /* DEBUG */ | |
177 | if (!ehci_is_TDI(ehci) | |
178 | || urb->dev->tt->hub != | |
179 | ehci_to_hcd(ehci)->self.root_hub) { | |
180 | if (usb_hub_clear_tt_buffer(urb) == 0) | |
181 | qh->clearing_tt = 1; | |
182 | } else { | |
183 | ||
184 | /* REVISIT ARC-derived cores don't clear the root | |
185 | * hub TT buffer in this way... | |
186 | */ | |
187 | } | |
188 | } | |
189 | } | |
190 | ||
14c04c0f | 191 | static int qtd_copy_status ( |
1da177e4 LT |
192 | struct ehci_hcd *ehci, |
193 | struct urb *urb, | |
194 | size_t length, | |
195 | u32 token | |
196 | ) | |
197 | { | |
14c04c0f AS |
198 | int status = -EINPROGRESS; |
199 | ||
1da177e4 LT |
200 | /* count IN/OUT bytes, not SETUP (even short packets) */ |
201 | if (likely (QTD_PID (token) != 2)) | |
202 | urb->actual_length += length - QTD_LENGTH (token); | |
203 | ||
204 | /* don't modify error codes */ | |
eb231054 | 205 | if (unlikely(urb->unlinked)) |
14c04c0f | 206 | return status; |
1da177e4 LT |
207 | |
208 | /* force cleanup after short read; not always an error */ | |
209 | if (unlikely (IS_SHORT_READ (token))) | |
14c04c0f | 210 | status = -EREMOTEIO; |
1da177e4 LT |
211 | |
212 | /* serious "can't proceed" faults reported by the hardware */ | |
213 | if (token & QTD_STS_HALT) { | |
214 | if (token & QTD_STS_BABBLE) { | |
215 | /* FIXME "must" disable babbling device's port too */ | |
14c04c0f | 216 | status = -EOVERFLOW; |
ba516de3 AS |
217 | /* CERR nonzero + halt --> stall */ |
218 | } else if (QTD_CERR(token)) { | |
219 | status = -EPIPE; | |
220 | ||
221 | /* In theory, more than one of the following bits can be set | |
222 | * since they are sticky and the transaction is retried. | |
223 | * Which to test first is rather arbitrary. | |
224 | */ | |
1da177e4 LT |
225 | } else if (token & QTD_STS_MMF) { |
226 | /* fs/ls interrupt xfer missed the complete-split */ | |
14c04c0f | 227 | status = -EPROTO; |
1da177e4 | 228 | } else if (token & QTD_STS_DBE) { |
14c04c0f | 229 | status = (QTD_PID (token) == 1) /* IN ? */ |
1da177e4 LT |
230 | ? -ENOSR /* hc couldn't read data */ |
231 | : -ECOMM; /* hc couldn't write data */ | |
232 | } else if (token & QTD_STS_XACT) { | |
ba516de3 AS |
233 | /* timeout, bad CRC, wrong PID, etc */ |
234 | ehci_dbg(ehci, "devpath %s ep%d%s 3strikes\n", | |
235 | urb->dev->devpath, | |
236 | usb_pipeendpoint(urb->pipe), | |
237 | usb_pipein(urb->pipe) ? "in" : "out"); | |
14c04c0f | 238 | status = -EPROTO; |
ba516de3 AS |
239 | } else { /* unknown */ |
240 | status = -EPROTO; | |
241 | } | |
1da177e4 LT |
242 | |
243 | ehci_vdbg (ehci, | |
244 | "dev%d ep%d%s qtd token %08x --> status %d\n", | |
245 | usb_pipedevice (urb->pipe), | |
246 | usb_pipeendpoint (urb->pipe), | |
247 | usb_pipein (urb->pipe) ? "in" : "out", | |
14c04c0f | 248 | token, status); |
1da177e4 | 249 | } |
14c04c0f AS |
250 | |
251 | return status; | |
1da177e4 LT |
252 | } |
253 | ||
254 | static void | |
14c04c0f | 255 | ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status) |
1da177e4 LT |
256 | __releases(ehci->lock) |
257 | __acquires(ehci->lock) | |
258 | { | |
259 | if (likely (urb->hcpriv != NULL)) { | |
260 | struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv; | |
261 | ||
262 | /* S-mask in a QH means it's an interrupt urb */ | |
3807e26d | 263 | if ((qh->hw->hw_info2 & cpu_to_hc32(ehci, QH_SMASK)) != 0) { |
1da177e4 LT |
264 | |
265 | /* ... update hc-wide periodic stats (for usbfs) */ | |
266 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs--; | |
267 | } | |
1da177e4 LT |
268 | } |
269 | ||
eb231054 AS |
270 | if (unlikely(urb->unlinked)) { |
271 | COUNT(ehci->stats.unlink); | |
272 | } else { | |
4f667627 DB |
273 | /* report non-error and short read status as zero */ |
274 | if (status == -EINPROGRESS || status == -EREMOTEIO) | |
14c04c0f | 275 | status = 0; |
eb231054 | 276 | COUNT(ehci->stats.complete); |
1da177e4 | 277 | } |
1da177e4 LT |
278 | |
279 | #ifdef EHCI_URB_TRACE | |
280 | ehci_dbg (ehci, | |
281 | "%s %s urb %p ep%d%s status %d len %d/%d\n", | |
441b62c1 | 282 | __func__, urb->dev->devpath, urb, |
1da177e4 LT |
283 | usb_pipeendpoint (urb->pipe), |
284 | usb_pipein (urb->pipe) ? "in" : "out", | |
14c04c0f | 285 | status, |
1da177e4 LT |
286 | urb->actual_length, urb->transfer_buffer_length); |
287 | #endif | |
288 | ||
289 | /* complete() can reenter this HCD */ | |
e9df41c5 | 290 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
1da177e4 | 291 | spin_unlock (&ehci->lock); |
4a00027d | 292 | usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status); |
1da177e4 LT |
293 | spin_lock (&ehci->lock); |
294 | } | |
295 | ||
296 | static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); | |
297 | static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); | |
298 | ||
1da177e4 LT |
299 | static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh); |
300 | ||
301 | /* | |
302 | * Process and free completed qtds for a qh, returning URBs to drivers. | |
303 | * Chases up to qh->hw_current. Returns number of completions called, | |
304 | * indicating how much "real" work we did. | |
305 | */ | |
1da177e4 | 306 | static unsigned |
7d12e780 | 307 | qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh) |
1da177e4 | 308 | { |
3a44494e | 309 | struct ehci_qtd *last, *end = qh->dummy; |
1da177e4 | 310 | struct list_head *entry, *tmp; |
3a44494e | 311 | int last_status; |
1da177e4 LT |
312 | int stopped; |
313 | unsigned count = 0; | |
1da177e4 | 314 | u8 state; |
3807e26d | 315 | struct ehci_qh_hw *hw = qh->hw; |
1da177e4 LT |
316 | |
317 | if (unlikely (list_empty (&qh->qtd_list))) | |
318 | return count; | |
319 | ||
320 | /* completions (or tasks on other cpus) must never clobber HALT | |
321 | * till we've gone through and cleaned everything up, even when | |
322 | * they add urbs to this qh's queue or mark them for unlinking. | |
323 | * | |
324 | * NOTE: unlinking expects to be done in queue order. | |
3a44494e AS |
325 | * |
326 | * It's a bug for qh->qh_state to be anything other than | |
327 | * QH_STATE_IDLE, unless our caller is scan_async() or | |
328 | * scan_periodic(). | |
1da177e4 LT |
329 | */ |
330 | state = qh->qh_state; | |
331 | qh->qh_state = QH_STATE_COMPLETING; | |
332 | stopped = (state == QH_STATE_IDLE); | |
333 | ||
3a44494e AS |
334 | rescan: |
335 | last = NULL; | |
336 | last_status = -EINPROGRESS; | |
337 | qh->needs_rescan = 0; | |
338 | ||
1da177e4 LT |
339 | /* remove de-activated QTDs from front of queue. |
340 | * after faults (including short reads), cleanup this urb | |
341 | * then let the queue advance. | |
342 | * if queue is stopped, handles unlinks. | |
343 | */ | |
344 | list_for_each_safe (entry, tmp, &qh->qtd_list) { | |
345 | struct ehci_qtd *qtd; | |
346 | struct urb *urb; | |
347 | u32 token = 0; | |
348 | ||
349 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); | |
350 | urb = qtd->urb; | |
351 | ||
352 | /* clean up any state from previous QTD ...*/ | |
353 | if (last) { | |
354 | if (likely (last->urb != urb)) { | |
14c04c0f | 355 | ehci_urb_done(ehci, last->urb, last_status); |
1da177e4 | 356 | count++; |
b5f7a0ec | 357 | last_status = -EINPROGRESS; |
1da177e4 LT |
358 | } |
359 | ehci_qtd_free (ehci, last); | |
360 | last = NULL; | |
361 | } | |
362 | ||
363 | /* ignore urbs submitted during completions we reported */ | |
364 | if (qtd == end) | |
365 | break; | |
366 | ||
367 | /* hardware copies qtd out of qh overlay */ | |
368 | rmb (); | |
6dbd682b | 369 | token = hc32_to_cpu(ehci, qtd->hw_token); |
1da177e4 LT |
370 | |
371 | /* always clean up qtds the hc de-activated */ | |
a2c2706e | 372 | retry_xacterr: |
1da177e4 LT |
373 | if ((token & QTD_STS_ACTIVE) == 0) { |
374 | ||
332960bd VP |
375 | /* Report Data Buffer Error: non-fatal but useful */ |
376 | if (token & QTD_STS_DBE) | |
377 | ehci_dbg(ehci, | |
378 | "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n", | |
379 | urb, | |
380 | usb_endpoint_num(&urb->ep->desc), | |
381 | usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out", | |
382 | urb->transfer_buffer_length, | |
383 | qtd, | |
384 | qh); | |
385 | ||
a082b5c7 DB |
386 | /* on STALL, error, and short reads this urb must |
387 | * complete and all its qtds must be recycled. | |
388 | */ | |
1da177e4 | 389 | if ((token & QTD_STS_HALT) != 0) { |
a2c2706e AS |
390 | |
391 | /* retry transaction errors until we | |
392 | * reach the software xacterr limit | |
393 | */ | |
394 | if ((token & QTD_STS_XACT) && | |
395 | QTD_CERR(token) == 0 && | |
ef4638f9 | 396 | ++qh->xacterrs < QH_XACTERR_MAX && |
a2c2706e AS |
397 | !urb->unlinked) { |
398 | ehci_dbg(ehci, | |
d0626808 | 399 | "detected XactErr len %zu/%zu retry %d\n", |
ef4638f9 | 400 | qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs); |
a2c2706e AS |
401 | |
402 | /* reset the token in the qtd and the | |
403 | * qh overlay (which still contains | |
404 | * the qtd) so that we pick up from | |
405 | * where we left off | |
406 | */ | |
407 | token &= ~QTD_STS_HALT; | |
408 | token |= QTD_STS_ACTIVE | | |
409 | (EHCI_TUNE_CERR << 10); | |
410 | qtd->hw_token = cpu_to_hc32(ehci, | |
411 | token); | |
412 | wmb(); | |
3807e26d AD |
413 | hw->hw_token = cpu_to_hc32(ehci, |
414 | token); | |
a2c2706e AS |
415 | goto retry_xacterr; |
416 | } | |
1da177e4 LT |
417 | stopped = 1; |
418 | ||
419 | /* magic dummy for some short reads; qh won't advance. | |
420 | * that silicon quirk can kick in with this dummy too. | |
a082b5c7 DB |
421 | * |
422 | * other short reads won't stop the queue, including | |
423 | * control transfers (status stage handles that) or | |
424 | * most other single-qtd reads ... the queue stops if | |
425 | * URB_SHORT_NOT_OK was set so the driver submitting | |
426 | * the urbs could clean it up. | |
1da177e4 LT |
427 | */ |
428 | } else if (IS_SHORT_READ (token) | |
6dbd682b SR |
429 | && !(qtd->hw_alt_next |
430 | & EHCI_LIST_END(ehci))) { | |
1da177e4 | 431 | stopped = 1; |
1da177e4 LT |
432 | } |
433 | ||
434 | /* stop scanning when we reach qtds the hc is using */ | |
435 | } else if (likely (!stopped | |
e8799906 | 436 | && ehci->rh_state == EHCI_RH_RUNNING)) { |
1da177e4 LT |
437 | break; |
438 | ||
a082b5c7 | 439 | /* scan the whole queue for unlinks whenever it stops */ |
1da177e4 LT |
440 | } else { |
441 | stopped = 1; | |
442 | ||
a082b5c7 | 443 | /* cancel everything if we halt, suspend, etc */ |
e8799906 | 444 | if (ehci->rh_state != EHCI_RH_RUNNING) |
14c04c0f | 445 | last_status = -ESHUTDOWN; |
1da177e4 | 446 | |
a082b5c7 DB |
447 | /* this qtd is active; skip it unless a previous qtd |
448 | * for its urb faulted, or its urb was canceled. | |
1da177e4 | 449 | */ |
a082b5c7 | 450 | else if (last_status == -EINPROGRESS && !urb->unlinked) |
1da177e4 | 451 | continue; |
53bd6a60 | 452 | |
a082b5c7 | 453 | /* qh unlinked; token in overlay may be most current */ |
1da177e4 | 454 | if (state == QH_STATE_IDLE |
6dbd682b | 455 | && cpu_to_hc32(ehci, qtd->qtd_dma) |
3807e26d AD |
456 | == hw->hw_current) { |
457 | token = hc32_to_cpu(ehci, hw->hw_token); | |
1da177e4 | 458 | |
914b7012 AS |
459 | /* An unlink may leave an incomplete |
460 | * async transaction in the TT buffer. | |
461 | * We have to clear it. | |
462 | */ | |
463 | ehci_clear_tt_buffer(ehci, qh, urb, token); | |
464 | } | |
1da177e4 | 465 | } |
53bd6a60 | 466 | |
4f667627 DB |
467 | /* unless we already know the urb's status, collect qtd status |
468 | * and update count of bytes transferred. in common short read | |
469 | * cases with only one data qtd (including control transfers), | |
470 | * queue processing won't halt. but with two or more qtds (for | |
471 | * example, with a 32 KB transfer), when the first qtd gets a | |
472 | * short read the second must be removed by hand. | |
473 | */ | |
474 | if (last_status == -EINPROGRESS) { | |
475 | last_status = qtd_copy_status(ehci, urb, | |
476 | qtd->length, token); | |
477 | if (last_status == -EREMOTEIO | |
478 | && (qtd->hw_alt_next | |
479 | & EHCI_LIST_END(ehci))) | |
480 | last_status = -EINPROGRESS; | |
914b7012 AS |
481 | |
482 | /* As part of low/full-speed endpoint-halt processing | |
483 | * we must clear the TT buffer (11.17.5). | |
484 | */ | |
485 | if (unlikely(last_status != -EINPROGRESS && | |
c2f6595f AS |
486 | last_status != -EREMOTEIO)) { |
487 | /* The TT's in some hubs malfunction when they | |
488 | * receive this request following a STALL (they | |
489 | * stop sending isochronous packets). Since a | |
490 | * STALL can't leave the TT buffer in a busy | |
491 | * state (if you believe Figures 11-48 - 11-51 | |
492 | * in the USB 2.0 spec), we won't clear the TT | |
493 | * buffer in this case. Strictly speaking this | |
494 | * is a violation of the spec. | |
495 | */ | |
496 | if (last_status != -EPIPE) | |
497 | ehci_clear_tt_buffer(ehci, qh, urb, | |
498 | token); | |
499 | } | |
b0d9efba | 500 | } |
1da177e4 | 501 | |
a082b5c7 DB |
502 | /* if we're removing something not at the queue head, |
503 | * patch the hardware queue pointer. | |
504 | */ | |
1da177e4 LT |
505 | if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { |
506 | last = list_entry (qtd->qtd_list.prev, | |
507 | struct ehci_qtd, qtd_list); | |
508 | last->hw_next = qtd->hw_next; | |
509 | } | |
a082b5c7 DB |
510 | |
511 | /* remove qtd; it's recycled after possible urb completion */ | |
1da177e4 LT |
512 | list_del (&qtd->qtd_list); |
513 | last = qtd; | |
a2c2706e AS |
514 | |
515 | /* reinit the xacterr counter for the next qtd */ | |
ef4638f9 | 516 | qh->xacterrs = 0; |
1da177e4 LT |
517 | } |
518 | ||
519 | /* last urb's completion might still need calling */ | |
520 | if (likely (last != NULL)) { | |
14c04c0f | 521 | ehci_urb_done(ehci, last->urb, last_status); |
1da177e4 LT |
522 | count++; |
523 | ehci_qtd_free (ehci, last); | |
524 | } | |
525 | ||
3a44494e AS |
526 | /* Do we need to rescan for URBs dequeued during a giveback? */ |
527 | if (unlikely(qh->needs_rescan)) { | |
528 | /* If the QH is already unlinked, do the rescan now. */ | |
529 | if (state == QH_STATE_IDLE) | |
530 | goto rescan; | |
531 | ||
532 | /* Otherwise we have to wait until the QH is fully unlinked. | |
533 | * Our caller will start an unlink if qh->needs_rescan is | |
534 | * set. But if an unlink has already started, nothing needs | |
535 | * to be done. | |
536 | */ | |
537 | if (state != QH_STATE_LINKED) | |
538 | qh->needs_rescan = 0; | |
539 | } | |
540 | ||
1da177e4 LT |
541 | /* restore original state; caller must unlink or relink */ |
542 | qh->qh_state = state; | |
543 | ||
544 | /* be sure the hardware's done with the qh before refreshing | |
545 | * it after fault cleanup, or recovering from silicon wrongly | |
546 | * overlaying the dummy qtd (which reduces DMA chatter). | |
547 | */ | |
3807e26d | 548 | if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci)) { |
1da177e4 LT |
549 | switch (state) { |
550 | case QH_STATE_IDLE: | |
551 | qh_refresh(ehci, qh); | |
552 | break; | |
553 | case QH_STATE_LINKED: | |
a082b5c7 DB |
554 | /* We won't refresh a QH that's linked (after the HC |
555 | * stopped the queue). That avoids a race: | |
556 | * - HC reads first part of QH; | |
557 | * - CPU updates that first part and the token; | |
558 | * - HC reads rest of that QH, including token | |
559 | * Result: HC gets an inconsistent image, and then | |
560 | * DMAs to/from the wrong memory (corrupting it). | |
561 | * | |
562 | * That should be rare for interrupt transfers, | |
1da177e4 LT |
563 | * except maybe high bandwidth ... |
564 | */ | |
a448c9d8 AS |
565 | |
566 | /* Tell the caller to start an unlink */ | |
567 | qh->needs_rescan = 1; | |
1da177e4 LT |
568 | break; |
569 | /* otherwise, unlink already started */ | |
570 | } | |
571 | } | |
572 | ||
573 | return count; | |
574 | } | |
575 | ||
576 | /*-------------------------------------------------------------------------*/ | |
577 | ||
578 | // high bandwidth multiplier, as encoded in highspeed endpoint descriptors | |
579 | #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) | |
580 | // ... and packet size, for any kind of endpoint descriptor | |
581 | #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) | |
582 | ||
583 | /* | |
584 | * reverse of qh_urb_transaction: free a list of TDs. | |
585 | * used for cleanup after errors, before HC sees an URB's TDs. | |
586 | */ | |
587 | static void qtd_list_free ( | |
588 | struct ehci_hcd *ehci, | |
589 | struct urb *urb, | |
590 | struct list_head *qtd_list | |
591 | ) { | |
592 | struct list_head *entry, *temp; | |
593 | ||
594 | list_for_each_safe (entry, temp, qtd_list) { | |
595 | struct ehci_qtd *qtd; | |
596 | ||
597 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); | |
598 | list_del (&qtd->qtd_list); | |
599 | ehci_qtd_free (ehci, qtd); | |
600 | } | |
601 | } | |
602 | ||
603 | /* | |
604 | * create a list of filled qtds for this URB; won't link into qh. | |
605 | */ | |
606 | static struct list_head * | |
607 | qh_urb_transaction ( | |
608 | struct ehci_hcd *ehci, | |
609 | struct urb *urb, | |
610 | struct list_head *head, | |
55016f10 | 611 | gfp_t flags |
1da177e4 LT |
612 | ) { |
613 | struct ehci_qtd *qtd, *qtd_prev; | |
614 | dma_addr_t buf; | |
40f8db8f | 615 | int len, this_sg_len, maxpacket; |
1da177e4 LT |
616 | int is_input; |
617 | u32 token; | |
40f8db8f AS |
618 | int i; |
619 | struct scatterlist *sg; | |
1da177e4 LT |
620 | |
621 | /* | |
622 | * URBs map to sequences of QTDs: one logical transaction | |
623 | */ | |
624 | qtd = ehci_qtd_alloc (ehci, flags); | |
625 | if (unlikely (!qtd)) | |
626 | return NULL; | |
627 | list_add_tail (&qtd->qtd_list, head); | |
628 | qtd->urb = urb; | |
629 | ||
630 | token = QTD_STS_ACTIVE; | |
631 | token |= (EHCI_TUNE_CERR << 10); | |
632 | /* for split transactions, SplitXState initialized to zero */ | |
633 | ||
634 | len = urb->transfer_buffer_length; | |
635 | is_input = usb_pipein (urb->pipe); | |
636 | if (usb_pipecontrol (urb->pipe)) { | |
637 | /* SETUP pid */ | |
6dbd682b SR |
638 | qtd_fill(ehci, qtd, urb->setup_dma, |
639 | sizeof (struct usb_ctrlrequest), | |
640 | token | (2 /* "setup" */ << 8), 8); | |
1da177e4 LT |
641 | |
642 | /* ... and always at least one more pid */ | |
643 | token ^= QTD_TOGGLE; | |
644 | qtd_prev = qtd; | |
645 | qtd = ehci_qtd_alloc (ehci, flags); | |
646 | if (unlikely (!qtd)) | |
647 | goto cleanup; | |
648 | qtd->urb = urb; | |
6dbd682b | 649 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
1da177e4 | 650 | list_add_tail (&qtd->qtd_list, head); |
6912354a AS |
651 | |
652 | /* for zero length DATA stages, STATUS is always IN */ | |
653 | if (len == 0) | |
654 | token |= (1 /* "in" */ << 8); | |
53bd6a60 | 655 | } |
1da177e4 LT |
656 | |
657 | /* | |
658 | * data transfer stage: buffer setup | |
659 | */ | |
bc677d5b | 660 | i = urb->num_mapped_sgs; |
40f8db8f | 661 | if (len > 0 && i > 0) { |
910f8d0c | 662 | sg = urb->sg; |
40f8db8f AS |
663 | buf = sg_dma_address(sg); |
664 | ||
665 | /* urb->transfer_buffer_length may be smaller than the | |
666 | * size of the scatterlist (or vice versa) | |
667 | */ | |
668 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
669 | } else { | |
670 | sg = NULL; | |
671 | buf = urb->transfer_dma; | |
672 | this_sg_len = len; | |
673 | } | |
1da177e4 | 674 | |
6912354a | 675 | if (is_input) |
1da177e4 LT |
676 | token |= (1 /* "in" */ << 8); |
677 | /* else it's already initted to "out" pid (0 << 8) */ | |
678 | ||
679 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); | |
680 | ||
681 | /* | |
682 | * buffer gets wrapped in one or more qtds; | |
683 | * last one may be "short" (including zero len) | |
684 | * and may serve as a control status ack | |
685 | */ | |
686 | for (;;) { | |
687 | int this_qtd_len; | |
688 | ||
40f8db8f AS |
689 | this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token, |
690 | maxpacket); | |
691 | this_sg_len -= this_qtd_len; | |
1da177e4 LT |
692 | len -= this_qtd_len; |
693 | buf += this_qtd_len; | |
a082b5c7 DB |
694 | |
695 | /* | |
696 | * short reads advance to a "magic" dummy instead of the next | |
697 | * qtd ... that forces the queue to stop, for manual cleanup. | |
698 | * (this will usually be overridden later.) | |
699 | */ | |
1da177e4 | 700 | if (is_input) |
3807e26d | 701 | qtd->hw_alt_next = ehci->async->hw->hw_alt_next; |
1da177e4 LT |
702 | |
703 | /* qh makes control packets use qtd toggle; maybe switch it */ | |
704 | if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) | |
705 | token ^= QTD_TOGGLE; | |
706 | ||
40f8db8f AS |
707 | if (likely(this_sg_len <= 0)) { |
708 | if (--i <= 0 || len <= 0) | |
709 | break; | |
710 | sg = sg_next(sg); | |
711 | buf = sg_dma_address(sg); | |
712 | this_sg_len = min_t(int, sg_dma_len(sg), len); | |
713 | } | |
1da177e4 LT |
714 | |
715 | qtd_prev = qtd; | |
716 | qtd = ehci_qtd_alloc (ehci, flags); | |
717 | if (unlikely (!qtd)) | |
718 | goto cleanup; | |
719 | qtd->urb = urb; | |
6dbd682b | 720 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
1da177e4 LT |
721 | list_add_tail (&qtd->qtd_list, head); |
722 | } | |
723 | ||
a082b5c7 DB |
724 | /* |
725 | * unless the caller requires manual cleanup after short reads, | |
726 | * have the alt_next mechanism keep the queue running after the | |
727 | * last data qtd (the only one, for control and most other cases). | |
1da177e4 LT |
728 | */ |
729 | if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 | |
730 | || usb_pipecontrol (urb->pipe))) | |
6dbd682b | 731 | qtd->hw_alt_next = EHCI_LIST_END(ehci); |
1da177e4 LT |
732 | |
733 | /* | |
734 | * control requests may need a terminating data "status" ack; | |
9a971dda ML |
735 | * other OUT ones may need a terminating short packet |
736 | * (zero length). | |
1da177e4 | 737 | */ |
6912354a | 738 | if (likely (urb->transfer_buffer_length != 0)) { |
1da177e4 LT |
739 | int one_more = 0; |
740 | ||
741 | if (usb_pipecontrol (urb->pipe)) { | |
742 | one_more = 1; | |
743 | token ^= 0x0100; /* "in" <--> "out" */ | |
744 | token |= QTD_TOGGLE; /* force DATA1 */ | |
9a971dda | 745 | } else if (usb_pipeout(urb->pipe) |
1da177e4 LT |
746 | && (urb->transfer_flags & URB_ZERO_PACKET) |
747 | && !(urb->transfer_buffer_length % maxpacket)) { | |
748 | one_more = 1; | |
749 | } | |
750 | if (one_more) { | |
751 | qtd_prev = qtd; | |
752 | qtd = ehci_qtd_alloc (ehci, flags); | |
753 | if (unlikely (!qtd)) | |
754 | goto cleanup; | |
755 | qtd->urb = urb; | |
6dbd682b | 756 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
1da177e4 LT |
757 | list_add_tail (&qtd->qtd_list, head); |
758 | ||
759 | /* never any data in such packets */ | |
6dbd682b | 760 | qtd_fill(ehci, qtd, 0, 0, token, 0); |
1da177e4 LT |
761 | } |
762 | } | |
763 | ||
764 | /* by default, enable interrupt on urb completion */ | |
765 | if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT))) | |
6dbd682b | 766 | qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC); |
1da177e4 LT |
767 | return head; |
768 | ||
769 | cleanup: | |
770 | qtd_list_free (ehci, urb, head); | |
771 | return NULL; | |
772 | } | |
773 | ||
774 | /*-------------------------------------------------------------------------*/ | |
775 | ||
776 | // Would be best to create all qh's from config descriptors, | |
777 | // when each interface/altsetting is established. Unlink | |
778 | // any previous qh and cancel its urbs first; endpoints are | |
779 | // implicitly reset then (data toggle too). | |
780 | // That'd mean updating how usbcore talks to HCDs. (2.7?) | |
781 | ||
782 | ||
783 | /* | |
784 | * Each QH holds a qtd list; a QH is used for everything except iso. | |
785 | * | |
786 | * For interrupt urbs, the scheduler must set the microframe scheduling | |
787 | * mask(s) each time the QH gets scheduled. For highspeed, that's | |
788 | * just one microframe in the s-mask. For split interrupt transactions | |
789 | * there are additional complications: c-mask, maybe FSTNs. | |
790 | */ | |
791 | static struct ehci_qh * | |
792 | qh_make ( | |
793 | struct ehci_hcd *ehci, | |
794 | struct urb *urb, | |
55016f10 | 795 | gfp_t flags |
1da177e4 LT |
796 | ) { |
797 | struct ehci_qh *qh = ehci_qh_alloc (ehci, flags); | |
798 | u32 info1 = 0, info2 = 0; | |
799 | int is_input, type; | |
800 | int maxp = 0; | |
340ba5f9 | 801 | struct usb_tt *tt = urb->dev->tt; |
3807e26d | 802 | struct ehci_qh_hw *hw; |
1da177e4 LT |
803 | |
804 | if (!qh) | |
805 | return qh; | |
806 | ||
807 | /* | |
808 | * init endpoint/device data for this QH | |
809 | */ | |
810 | info1 |= usb_pipeendpoint (urb->pipe) << 8; | |
811 | info1 |= usb_pipedevice (urb->pipe) << 0; | |
812 | ||
813 | is_input = usb_pipein (urb->pipe); | |
814 | type = usb_pipetype (urb->pipe); | |
815 | maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input); | |
816 | ||
caa9ef67 DB |
817 | /* 1024 byte maxpacket is a hardware ceiling. High bandwidth |
818 | * acts like up to 3KB, but is built from smaller packets. | |
819 | */ | |
820 | if (max_packet(maxp) > 1024) { | |
821 | ehci_dbg(ehci, "bogus qh maxpacket %d\n", max_packet(maxp)); | |
822 | goto done; | |
823 | } | |
824 | ||
1da177e4 LT |
825 | /* Compute interrupt scheduling parameters just once, and save. |
826 | * - allowing for high bandwidth, how many nsec/uframe are used? | |
827 | * - split transactions need a second CSPLIT uframe; same question | |
828 | * - splits also need a schedule gap (for full/low speed I/O) | |
829 | * - qh has a polling interval | |
830 | * | |
831 | * For control/bulk requests, the HC or TT handles these. | |
832 | */ | |
833 | if (type == PIPE_INTERRUPT) { | |
340ba5f9 DB |
834 | qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH, |
835 | is_input, 0, | |
836 | hb_mult(maxp) * max_packet(maxp))); | |
1da177e4 | 837 | qh->start = NO_FRAME; |
1e12c910 | 838 | qh->stamp = ehci->periodic_stamp; |
1da177e4 LT |
839 | |
840 | if (urb->dev->speed == USB_SPEED_HIGH) { | |
841 | qh->c_usecs = 0; | |
842 | qh->gap_uf = 0; | |
843 | ||
844 | qh->period = urb->interval >> 3; | |
845 | if (qh->period == 0 && urb->interval != 1) { | |
846 | /* NOTE interval 2 or 4 uframes could work. | |
847 | * But interval 1 scheduling is simpler, and | |
848 | * includes high bandwidth. | |
849 | */ | |
1b9a38bf AS |
850 | urb->interval = 1; |
851 | } else if (qh->period > ehci->periodic_size) { | |
852 | qh->period = ehci->periodic_size; | |
853 | urb->interval = qh->period << 3; | |
1da177e4 LT |
854 | } |
855 | } else { | |
d0384200 DB |
856 | int think_time; |
857 | ||
1da177e4 LT |
858 | /* gap is f(FS/LS transfer times) */ |
859 | qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed, | |
860 | is_input, 0, maxp) / (125 * 1000); | |
861 | ||
862 | /* FIXME this just approximates SPLIT/CSPLIT times */ | |
863 | if (is_input) { // SPLIT, gap, CSPLIT+DATA | |
864 | qh->c_usecs = qh->usecs + HS_USECS (0); | |
865 | qh->usecs = HS_USECS (1); | |
866 | } else { // SPLIT+DATA, gap, CSPLIT | |
867 | qh->usecs += HS_USECS (1); | |
868 | qh->c_usecs = HS_USECS (0); | |
869 | } | |
870 | ||
d0384200 DB |
871 | think_time = tt ? tt->think_time : 0; |
872 | qh->tt_usecs = NS_TO_US (think_time + | |
873 | usb_calc_bus_time (urb->dev->speed, | |
874 | is_input, 0, max_packet (maxp))); | |
1da177e4 | 875 | qh->period = urb->interval; |
1b9a38bf AS |
876 | if (qh->period > ehci->periodic_size) { |
877 | qh->period = ehci->periodic_size; | |
878 | urb->interval = qh->period; | |
879 | } | |
1da177e4 LT |
880 | } |
881 | } | |
882 | ||
883 | /* support for tt scheduling, and access to toggles */ | |
6a8e87b2 | 884 | qh->dev = urb->dev; |
1da177e4 LT |
885 | |
886 | /* using TT? */ | |
887 | switch (urb->dev->speed) { | |
888 | case USB_SPEED_LOW: | |
4c53de72 | 889 | info1 |= QH_LOW_SPEED; |
1da177e4 LT |
890 | /* FALL THROUGH */ |
891 | ||
892 | case USB_SPEED_FULL: | |
893 | /* EPS 0 means "full" */ | |
894 | if (type != PIPE_INTERRUPT) | |
895 | info1 |= (EHCI_TUNE_RL_TT << 28); | |
896 | if (type == PIPE_CONTROL) { | |
4c53de72 AS |
897 | info1 |= QH_CONTROL_EP; /* for TT */ |
898 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ | |
1da177e4 LT |
899 | } |
900 | info1 |= maxp << 16; | |
901 | ||
902 | info2 |= (EHCI_TUNE_MULT_TT << 30); | |
8cd42e97 KG |
903 | |
904 | /* Some Freescale processors have an erratum in which the | |
905 | * port number in the queue head was 0..N-1 instead of 1..N. | |
906 | */ | |
907 | if (ehci_has_fsl_portno_bug(ehci)) | |
908 | info2 |= (urb->dev->ttport-1) << 23; | |
909 | else | |
910 | info2 |= urb->dev->ttport << 23; | |
1da177e4 LT |
911 | |
912 | /* set the address of the TT; for TDI's integrated | |
913 | * root hub tt, leave it zeroed. | |
914 | */ | |
340ba5f9 DB |
915 | if (tt && tt->hub != ehci_to_hcd(ehci)->self.root_hub) |
916 | info2 |= tt->hub->devnum << 16; | |
1da177e4 LT |
917 | |
918 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ | |
919 | ||
920 | break; | |
921 | ||
922 | case USB_SPEED_HIGH: /* no TT involved */ | |
4c53de72 | 923 | info1 |= QH_HIGH_SPEED; |
1da177e4 LT |
924 | if (type == PIPE_CONTROL) { |
925 | info1 |= (EHCI_TUNE_RL_HS << 28); | |
926 | info1 |= 64 << 16; /* usb2 fixed maxpacket */ | |
4c53de72 | 927 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ |
1da177e4 LT |
928 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
929 | } else if (type == PIPE_BULK) { | |
930 | info1 |= (EHCI_TUNE_RL_HS << 28); | |
caa9ef67 DB |
931 | /* The USB spec says that high speed bulk endpoints |
932 | * always use 512 byte maxpacket. But some device | |
933 | * vendors decided to ignore that, and MSFT is happy | |
934 | * to help them do so. So now people expect to use | |
935 | * such nonconformant devices with Linux too; sigh. | |
936 | */ | |
937 | info1 |= max_packet(maxp) << 16; | |
1da177e4 LT |
938 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
939 | } else { /* PIPE_INTERRUPT */ | |
940 | info1 |= max_packet (maxp) << 16; | |
941 | info2 |= hb_mult (maxp) << 30; | |
942 | } | |
943 | break; | |
944 | default: | |
82491c2a GKH |
945 | ehci_dbg(ehci, "bogus dev %p speed %d\n", urb->dev, |
946 | urb->dev->speed); | |
1da177e4 | 947 | done: |
c83e1a9f | 948 | qh_destroy(ehci, qh); |
1da177e4 LT |
949 | return NULL; |
950 | } | |
951 | ||
952 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ | |
953 | ||
954 | /* init as live, toggle clear, advance to dummy */ | |
955 | qh->qh_state = QH_STATE_IDLE; | |
3807e26d AD |
956 | hw = qh->hw; |
957 | hw->hw_info1 = cpu_to_hc32(ehci, info1); | |
958 | hw->hw_info2 = cpu_to_hc32(ehci, info2); | |
e04f5f7e | 959 | qh->is_out = !is_input; |
a455212d | 960 | usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1); |
1da177e4 LT |
961 | qh_refresh (ehci, qh); |
962 | return qh; | |
963 | } | |
964 | ||
965 | /*-------------------------------------------------------------------------*/ | |
966 | ||
967 | /* move qh (and its qtds) onto async queue; maybe enable queue. */ | |
968 | ||
969 | static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh) | |
970 | { | |
6dbd682b | 971 | __hc32 dma = QH_NEXT(ehci, qh->qh_dma); |
1da177e4 LT |
972 | struct ehci_qh *head; |
973 | ||
914b7012 AS |
974 | /* Don't link a QH if there's a Clear-TT-Buffer pending */ |
975 | if (unlikely(qh->clearing_tt)) | |
976 | return; | |
977 | ||
3a44494e AS |
978 | WARN_ON(qh->qh_state != QH_STATE_IDLE); |
979 | ||
1da177e4 LT |
980 | /* (re)start the async schedule? */ |
981 | head = ehci->async; | |
982 | timer_action_done (ehci, TIMER_ASYNC_OFF); | |
983 | if (!head->qh_next.qh) { | |
3d9545cc | 984 | if (!(ehci->command & CMD_ASE)) { |
1da177e4 | 985 | /* in case a clear of CMD_ASE didn't take yet */ |
083522d7 BH |
986 | (void)handshake(ehci, &ehci->regs->status, |
987 | STS_ASS, 0, 150); | |
3d9545cc AS |
988 | ehci->command |= CMD_ASE; |
989 | ehci_writel(ehci, ehci->command, &ehci->regs->command); | |
1da177e4 LT |
990 | /* posted write need not be known to HC yet ... */ |
991 | } | |
992 | } | |
993 | ||
a455212d | 994 | /* clear halt and/or toggle; and maybe recover from silicon quirk */ |
3a44494e | 995 | qh_refresh(ehci, qh); |
1da177e4 LT |
996 | |
997 | /* splice right after start */ | |
998 | qh->qh_next = head->qh_next; | |
3807e26d | 999 | qh->hw->hw_next = head->hw->hw_next; |
1da177e4 LT |
1000 | wmb (); |
1001 | ||
1002 | head->qh_next.qh = qh; | |
3807e26d | 1003 | head->hw->hw_next = dma; |
1da177e4 | 1004 | |
ef4638f9 | 1005 | qh->xacterrs = 0; |
1da177e4 LT |
1006 | qh->qh_state = QH_STATE_LINKED; |
1007 | /* qtd completions reported later by interrupt */ | |
1008 | } | |
1009 | ||
1010 | /*-------------------------------------------------------------------------*/ | |
1011 | ||
1da177e4 LT |
1012 | /* |
1013 | * For control/bulk/interrupt, return QH with these TDs appended. | |
1014 | * Allocates and initializes the QH if necessary. | |
1015 | * Returns null if it can't allocate a QH it needs to. | |
1016 | * If the QH has TDs (urbs) already, that's great. | |
1017 | */ | |
1018 | static struct ehci_qh *qh_append_tds ( | |
1019 | struct ehci_hcd *ehci, | |
1020 | struct urb *urb, | |
1021 | struct list_head *qtd_list, | |
1022 | int epnum, | |
1023 | void **ptr | |
1024 | ) | |
1025 | { | |
1026 | struct ehci_qh *qh = NULL; | |
fd05e720 | 1027 | __hc32 qh_addr_mask = cpu_to_hc32(ehci, 0x7f); |
1da177e4 LT |
1028 | |
1029 | qh = (struct ehci_qh *) *ptr; | |
1030 | if (unlikely (qh == NULL)) { | |
1031 | /* can't sleep here, we have ehci->lock... */ | |
1032 | qh = qh_make (ehci, urb, GFP_ATOMIC); | |
1033 | *ptr = qh; | |
1034 | } | |
1035 | if (likely (qh != NULL)) { | |
1036 | struct ehci_qtd *qtd; | |
1037 | ||
1038 | if (unlikely (list_empty (qtd_list))) | |
1039 | qtd = NULL; | |
1040 | else | |
1041 | qtd = list_entry (qtd_list->next, struct ehci_qtd, | |
1042 | qtd_list); | |
1043 | ||
1044 | /* control qh may need patching ... */ | |
1045 | if (unlikely (epnum == 0)) { | |
1046 | ||
1047 | /* usb_reset_device() briefly reverts to address 0 */ | |
1048 | if (usb_pipedevice (urb->pipe) == 0) | |
3807e26d | 1049 | qh->hw->hw_info1 &= ~qh_addr_mask; |
1da177e4 LT |
1050 | } |
1051 | ||
1052 | /* just one way to queue requests: swap with the dummy qtd. | |
1053 | * only hc or qh_refresh() ever modify the overlay. | |
1054 | */ | |
1055 | if (likely (qtd != NULL)) { | |
1056 | struct ehci_qtd *dummy; | |
1057 | dma_addr_t dma; | |
6dbd682b | 1058 | __hc32 token; |
1da177e4 LT |
1059 | |
1060 | /* to avoid racing the HC, use the dummy td instead of | |
1061 | * the first td of our list (becomes new dummy). both | |
1062 | * tds stay deactivated until we're done, when the | |
1063 | * HC is allowed to fetch the old dummy (4.10.2). | |
1064 | */ | |
1065 | token = qtd->hw_token; | |
6dbd682b | 1066 | qtd->hw_token = HALT_BIT(ehci); |
41f05ded | 1067 | |
1da177e4 LT |
1068 | dummy = qh->dummy; |
1069 | ||
1070 | dma = dummy->qtd_dma; | |
1071 | *dummy = *qtd; | |
1072 | dummy->qtd_dma = dma; | |
1073 | ||
1074 | list_del (&qtd->qtd_list); | |
1075 | list_add (&dummy->qtd_list, qtd_list); | |
7d283aee | 1076 | list_splice_tail(qtd_list, &qh->qtd_list); |
1da177e4 | 1077 | |
6dbd682b | 1078 | ehci_qtd_init(ehci, qtd, qtd->qtd_dma); |
1da177e4 LT |
1079 | qh->dummy = qtd; |
1080 | ||
1081 | /* hc must see the new dummy at list end */ | |
1082 | dma = qtd->qtd_dma; | |
1083 | qtd = list_entry (qh->qtd_list.prev, | |
1084 | struct ehci_qtd, qtd_list); | |
6dbd682b | 1085 | qtd->hw_next = QTD_NEXT(ehci, dma); |
1da177e4 LT |
1086 | |
1087 | /* let the hc process these next qtds */ | |
1088 | wmb (); | |
1089 | dummy->hw_token = token; | |
1090 | ||
c83e1a9f | 1091 | urb->hcpriv = qh; |
1da177e4 LT |
1092 | } |
1093 | } | |
1094 | return qh; | |
1095 | } | |
1096 | ||
1097 | /*-------------------------------------------------------------------------*/ | |
1098 | ||
1099 | static int | |
1100 | submit_async ( | |
1101 | struct ehci_hcd *ehci, | |
1da177e4 LT |
1102 | struct urb *urb, |
1103 | struct list_head *qtd_list, | |
55016f10 | 1104 | gfp_t mem_flags |
1da177e4 | 1105 | ) { |
1da177e4 LT |
1106 | int epnum; |
1107 | unsigned long flags; | |
1108 | struct ehci_qh *qh = NULL; | |
e9df41c5 | 1109 | int rc; |
1da177e4 | 1110 | |
e9df41c5 | 1111 | epnum = urb->ep->desc.bEndpointAddress; |
1da177e4 LT |
1112 | |
1113 | #ifdef EHCI_URB_TRACE | |
eb34a908 DD |
1114 | { |
1115 | struct ehci_qtd *qtd; | |
1116 | qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list); | |
1117 | ehci_dbg(ehci, | |
1118 | "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", | |
1119 | __func__, urb->dev->devpath, urb, | |
1120 | epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", | |
1121 | urb->transfer_buffer_length, | |
1122 | qtd, urb->ep->hcpriv); | |
1123 | } | |
1da177e4 LT |
1124 | #endif |
1125 | ||
1126 | spin_lock_irqsave (&ehci->lock, flags); | |
541c7d43 | 1127 | if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) { |
8de98402 BH |
1128 | rc = -ESHUTDOWN; |
1129 | goto done; | |
1130 | } | |
e9df41c5 AS |
1131 | rc = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
1132 | if (unlikely(rc)) | |
1133 | goto done; | |
8de98402 | 1134 | |
e9df41c5 | 1135 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
8de98402 | 1136 | if (unlikely(qh == NULL)) { |
e9df41c5 | 1137 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
8de98402 BH |
1138 | rc = -ENOMEM; |
1139 | goto done; | |
1140 | } | |
1da177e4 LT |
1141 | |
1142 | /* Control/bulk operations through TTs don't need scheduling, | |
1143 | * the HC and TT handle it when the TT has a buffer ready. | |
1144 | */ | |
8de98402 | 1145 | if (likely (qh->qh_state == QH_STATE_IDLE)) |
7a0f0d95 | 1146 | qh_link_async(ehci, qh); |
8de98402 | 1147 | done: |
1da177e4 | 1148 | spin_unlock_irqrestore (&ehci->lock, flags); |
8de98402 | 1149 | if (unlikely (qh == NULL)) |
1da177e4 | 1150 | qtd_list_free (ehci, urb, qtd_list); |
8de98402 | 1151 | return rc; |
1da177e4 LT |
1152 | } |
1153 | ||
1154 | /*-------------------------------------------------------------------------*/ | |
1155 | ||
99ac5b1e | 1156 | /* the async qh for the qtds being unlinked are now gone from the HC */ |
1da177e4 | 1157 | |
7d12e780 | 1158 | static void end_unlink_async (struct ehci_hcd *ehci) |
1da177e4 | 1159 | { |
99ac5b1e | 1160 | struct ehci_qh *qh = ehci->async_unlink; |
1da177e4 LT |
1161 | struct ehci_qh *next; |
1162 | ||
07d29b63 | 1163 | iaa_watchdog_done(ehci); |
1da177e4 | 1164 | |
6dbd682b | 1165 | // qh->hw_next = cpu_to_hc32(qh->qh_dma); |
1da177e4 LT |
1166 | qh->qh_state = QH_STATE_IDLE; |
1167 | qh->qh_next.qh = NULL; | |
1da177e4 LT |
1168 | |
1169 | /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */ | |
99ac5b1e AS |
1170 | next = qh->unlink_next; |
1171 | ehci->async_unlink = next; | |
1172 | qh->unlink_next = NULL; | |
1da177e4 | 1173 | |
7d12e780 | 1174 | qh_completions (ehci, qh); |
1da177e4 | 1175 | |
e8799906 | 1176 | if (!list_empty(&qh->qtd_list) && ehci->rh_state == EHCI_RH_RUNNING) { |
1da177e4 | 1177 | qh_link_async (ehci, qh); |
e8799906 | 1178 | } else { |
1da177e4 LT |
1179 | /* it's not free to turn the async schedule on/off; leave it |
1180 | * active but idle for a while once it empties. | |
1181 | */ | |
e8799906 | 1182 | if (ehci->rh_state == EHCI_RH_RUNNING |
1da177e4 LT |
1183 | && ehci->async->qh_next.qh == NULL) |
1184 | timer_action (ehci, TIMER_ASYNC_OFF); | |
1185 | } | |
1186 | ||
1187 | if (next) { | |
99ac5b1e | 1188 | ehci->async_unlink = NULL; |
1da177e4 LT |
1189 | start_unlink_async (ehci, next); |
1190 | } | |
2f7ac6c1 GJ |
1191 | |
1192 | if (ehci->has_synopsys_hc_bug) | |
1193 | ehci_writel(ehci, (u32) ehci->async->qh_dma, | |
1194 | &ehci->regs->async_next); | |
1da177e4 LT |
1195 | } |
1196 | ||
1197 | /* makes sure the async qh will become idle */ | |
1198 | /* caller must own ehci->lock */ | |
1199 | ||
1200 | static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) | |
1201 | { | |
1da177e4 LT |
1202 | struct ehci_qh *prev; |
1203 | ||
1204 | #ifdef DEBUG | |
1205 | assert_spin_locked(&ehci->lock); | |
99ac5b1e | 1206 | if (ehci->async_unlink |
1da177e4 LT |
1207 | || (qh->qh_state != QH_STATE_LINKED |
1208 | && qh->qh_state != QH_STATE_UNLINK_WAIT) | |
1209 | ) | |
1210 | BUG (); | |
1211 | #endif | |
1212 | ||
1213 | /* stop async schedule right now? */ | |
1214 | if (unlikely (qh == ehci->async)) { | |
1215 | /* can't get here without STS_ASS set */ | |
e8799906 | 1216 | if (ehci->rh_state != EHCI_RH_HALTED |
99ac5b1e | 1217 | && !ehci->async_unlink) { |
d0852299 | 1218 | /* ... and CMD_IAAD clear */ |
3d9545cc AS |
1219 | ehci->command &= ~CMD_ASE; |
1220 | ehci_writel(ehci, ehci->command, &ehci->regs->command); | |
1da177e4 LT |
1221 | wmb (); |
1222 | // handshake later, if we need to | |
d0852299 | 1223 | timer_action_done (ehci, TIMER_ASYNC_OFF); |
1da177e4 | 1224 | } |
1da177e4 | 1225 | return; |
53bd6a60 | 1226 | } |
1da177e4 LT |
1227 | |
1228 | qh->qh_state = QH_STATE_UNLINK; | |
99ac5b1e | 1229 | ehci->async_unlink = qh; |
2f5bb665 AS |
1230 | if (!qh->unlink_next) |
1231 | ehci->async_unlink_last = qh; | |
1da177e4 LT |
1232 | |
1233 | prev = ehci->async; | |
1234 | while (prev->qh_next.qh != qh) | |
1235 | prev = prev->qh_next.qh; | |
1236 | ||
3807e26d | 1237 | prev->hw->hw_next = qh->hw->hw_next; |
1da177e4 | 1238 | prev->qh_next = qh->qh_next; |
004c1968 AS |
1239 | if (ehci->qh_scan_next == qh) |
1240 | ehci->qh_scan_next = qh->qh_next.qh; | |
1da177e4 LT |
1241 | wmb (); |
1242 | ||
391016f6 | 1243 | /* If the controller isn't running, we don't have to wait for it */ |
e8799906 | 1244 | if (unlikely(ehci->rh_state != EHCI_RH_RUNNING)) { |
99ac5b1e | 1245 | /* if (unlikely (qh->unlink_next != 0)) |
53bd6a60 | 1246 | * this will recurse, probably not much |
1da177e4 | 1247 | */ |
7d12e780 | 1248 | end_unlink_async (ehci); |
1da177e4 LT |
1249 | return; |
1250 | } | |
1251 | ||
3d9545cc | 1252 | ehci_writel(ehci, ehci->command | CMD_IAAD, &ehci->regs->command); |
083522d7 | 1253 | (void)ehci_readl(ehci, &ehci->regs->command); |
07d29b63 | 1254 | iaa_watchdog_start(ehci); |
1da177e4 LT |
1255 | } |
1256 | ||
1257 | /*-------------------------------------------------------------------------*/ | |
1258 | ||
7d12e780 | 1259 | static void scan_async (struct ehci_hcd *ehci) |
1da177e4 | 1260 | { |
94ae4976 | 1261 | bool stopped; |
1da177e4 LT |
1262 | struct ehci_qh *qh; |
1263 | enum ehci_timer_action action = TIMER_IO_WATCHDOG; | |
1264 | ||
1da177e4 | 1265 | timer_action_done (ehci, TIMER_ASYNC_SHRINK); |
e8799906 | 1266 | stopped = (ehci->rh_state != EHCI_RH_RUNNING); |
1da177e4 | 1267 | |
004c1968 AS |
1268 | ehci->qh_scan_next = ehci->async->qh_next.qh; |
1269 | while (ehci->qh_scan_next) { | |
1270 | qh = ehci->qh_scan_next; | |
1271 | ehci->qh_scan_next = qh->qh_next.qh; | |
1272 | rescan: | |
1273 | /* clean any finished work for this qh */ | |
1274 | if (!list_empty(&qh->qtd_list)) { | |
1275 | int temp; | |
1276 | ||
1277 | /* | |
1278 | * Unlinks could happen here; completion reporting | |
1279 | * drops the lock. That's why ehci->qh_scan_next | |
1280 | * always holds the next qh to scan; if the next qh | |
1281 | * gets unlinked then ehci->qh_scan_next is adjusted | |
1282 | * in start_unlink_async(). | |
1da177e4 | 1283 | */ |
004c1968 AS |
1284 | temp = qh_completions(ehci, qh); |
1285 | if (qh->needs_rescan) | |
1286 | unlink_async(ehci, qh); | |
1287 | qh->unlink_time = jiffies + EHCI_SHRINK_JIFFIES; | |
004c1968 AS |
1288 | if (temp != 0) |
1289 | goto rescan; | |
1290 | } | |
1da177e4 | 1291 | |
004c1968 AS |
1292 | /* unlink idle entries, reducing DMA usage as well |
1293 | * as HCD schedule-scanning costs. delay for any qh | |
1294 | * we just scanned, there's a not-unusual case that it | |
1295 | * doesn't stay idle for long. | |
1296 | * (plus, avoids some kind of re-activation race.) | |
1297 | */ | |
1298 | if (list_empty(&qh->qtd_list) | |
1299 | && qh->qh_state == QH_STATE_LINKED) { | |
99ac5b1e | 1300 | if (!ehci->async_unlink && (stopped || |
004c1968 AS |
1301 | time_after_eq(jiffies, qh->unlink_time))) |
1302 | start_unlink_async(ehci, qh); | |
1303 | else | |
1304 | action = TIMER_ASYNC_SHRINK; | |
1305 | } | |
1da177e4 LT |
1306 | } |
1307 | if (action == TIMER_ASYNC_SHRINK) | |
1308 | timer_action (ehci, TIMER_ASYNC_SHRINK); | |
1309 | } |