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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / net / wireless / ath / ath10k / htc.c
blobef3329ef52f369f0b65a7fd2e830ab07d99c573b
1 /*
2 * Copyright (c) 2005-2011 Atheros Communications Inc.
3 * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include "core.h"
19 #include "hif.h"
20 #include "debug.h"
21
22 /********/
23 /* Send */
24 /********/
25
26 static inline void ath10k_htc_send_complete_check(struct ath10k_htc_ep *ep,
27 int force)
28 {
29 /*
30 * Check whether HIF has any prior sends that have finished,
31 * have not had the post-processing done.
32 */
33 ath10k_hif_send_complete_check(ep->htc->ar, ep->ul_pipe_id, force);
34 }
35
36 static void ath10k_htc_control_tx_complete(struct ath10k *ar,
37 struct sk_buff *skb)
38 {
39 kfree_skb(skb);
40 }
41
42 static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar)
43 {
44 struct sk_buff *skb;
45 struct ath10k_skb_cb *skb_cb;
46
47 skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE);
48 if (!skb) {
49 ath10k_warn("Unable to allocate ctrl skb\n");
50 return NULL;
51 }
52
53 skb_reserve(skb, 20); /* FIXME: why 20 bytes? */
54 WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
55
56 skb_cb = ATH10K_SKB_CB(skb);
57 memset(skb_cb, 0, sizeof(*skb_cb));
58
59 ath10k_dbg(ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb);
60 return skb;
61 }
62
63 static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,
64 struct sk_buff *skb)
65 {
66 ath10k_skb_unmap(htc->ar->dev, skb);
67 skb_pull(skb, sizeof(struct ath10k_htc_hdr));
68 }
69
70 static void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
71 struct sk_buff *skb)
72 {
73 ath10k_dbg(ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
74 ep->eid, skb);
75
76 ath10k_htc_restore_tx_skb(ep->htc, skb);
77
78 if (!ep->ep_ops.ep_tx_complete) {
79 ath10k_warn("no tx handler for eid %d\n", ep->eid);
80 dev_kfree_skb_any(skb);
81 return;
82 }
83
84 ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);
85 }
86
87 /* assumes tx_lock is held */
88 static bool ath10k_htc_ep_need_credit_update(struct ath10k_htc_ep *ep)
89 {
90 if (!ep->tx_credit_flow_enabled)
91 return false;
92 if (ep->tx_credits >= ep->tx_credits_per_max_message)
93 return false;
94
95 ath10k_dbg(ATH10K_DBG_HTC, "HTC: endpoint %d needs credit update\n",
96 ep->eid);
97 return true;
98 }
99
100 static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
101 struct sk_buff *skb)
102 {
103 struct ath10k_htc_hdr *hdr;
104
105 hdr = (struct ath10k_htc_hdr *)skb->data;
106 memset(hdr, 0, sizeof(*hdr));
107
108 hdr->eid = ep->eid;
109 hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
110
111 spin_lock_bh(&ep->htc->tx_lock);
112 hdr->seq_no = ep->seq_no++;
113
114 if (ath10k_htc_ep_need_credit_update(ep))
115 hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
116
117 spin_unlock_bh(&ep->htc->tx_lock);
118 }
119
120 static int ath10k_htc_issue_skb(struct ath10k_htc *htc,
121 struct ath10k_htc_ep *ep,
122 struct sk_buff *skb,
123 u8 credits)
124 {
125 struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
126 int ret;
127
128 ath10k_dbg(ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
129 ep->eid, skb);
130
131 ath10k_htc_prepare_tx_skb(ep, skb);
132
133 ret = ath10k_skb_map(htc->ar->dev, skb);
134 if (ret)
135 goto err;
136
137 ret = ath10k_hif_send_head(htc->ar,
138 ep->ul_pipe_id,
139 ep->eid,
140 skb->len,
141 skb);
142 if (unlikely(ret))
143 goto err;
144
145 return 0;
146 err:
147 ath10k_warn("HTC issue failed: %d\n", ret);
148
149 spin_lock_bh(&htc->tx_lock);
150 ep->tx_credits += credits;
151 spin_unlock_bh(&htc->tx_lock);
152
153 /* this is the simplest way to handle out-of-resources for non-credit
154 * based endpoints. credit based endpoints can still get -ENOSR, but
155 * this is highly unlikely as credit reservation should prevent that */
156 if (ret == -ENOSR) {
157 spin_lock_bh(&htc->tx_lock);
158 __skb_queue_head(&ep->tx_queue, skb);
159 spin_unlock_bh(&htc->tx_lock);
160
161 return ret;
162 }
163
164 skb_cb->is_aborted = true;
165 ath10k_htc_notify_tx_completion(ep, skb);
166
167 return ret;
168 }
169
170 static struct sk_buff *ath10k_htc_get_skb_credit_based(struct ath10k_htc *htc,
171 struct ath10k_htc_ep *ep,
172 u8 *credits)
173 {
174 struct sk_buff *skb;
175 struct ath10k_skb_cb *skb_cb;
176 int credits_required;
177 int remainder;
178 unsigned int transfer_len;
179
180 lockdep_assert_held(&htc->tx_lock);
181
182 skb = __skb_dequeue(&ep->tx_queue);
183 if (!skb)
184 return NULL;
185
186 skb_cb = ATH10K_SKB_CB(skb);
187 transfer_len = skb->len;
188
189 if (likely(transfer_len <= htc->target_credit_size)) {
190 credits_required = 1;
191 } else {
192 /* figure out how many credits this message requires */
193 credits_required = transfer_len / htc->target_credit_size;
194 remainder = transfer_len % htc->target_credit_size;
195
196 if (remainder)
197 credits_required++;
198 }
199
200 ath10k_dbg(ATH10K_DBG_HTC, "Credits required %d got %d\n",
201 credits_required, ep->tx_credits);
202
203 if (ep->tx_credits < credits_required) {
204 __skb_queue_head(&ep->tx_queue, skb);
205 return NULL;
206 }
207
208 ep->tx_credits -= credits_required;
209 *credits = credits_required;
210 return skb;
211 }
212
213 static void ath10k_htc_send_work(struct work_struct *work)
214 {
215 struct ath10k_htc_ep *ep = container_of(work,
216 struct ath10k_htc_ep, send_work);
217 struct ath10k_htc *htc = ep->htc;
218 struct sk_buff *skb;
219 u8 credits = 0;
220 int ret;
221
222 while (true) {
223 if (ep->ul_is_polled)
224 ath10k_htc_send_complete_check(ep, 0);
225
226 spin_lock_bh(&htc->tx_lock);
227 if (ep->tx_credit_flow_enabled)
228 skb = ath10k_htc_get_skb_credit_based(htc, ep,
229 &credits);
230 else
231 skb = __skb_dequeue(&ep->tx_queue);
232 spin_unlock_bh(&htc->tx_lock);
233
234 if (!skb)
235 break;
236
237 ret = ath10k_htc_issue_skb(htc, ep, skb, credits);
238 if (ret == -ENOSR)
239 break;
240 }
241 }
242
243 int ath10k_htc_send(struct ath10k_htc *htc,
244 enum ath10k_htc_ep_id eid,
245 struct sk_buff *skb)
246 {
247 struct ath10k_htc_ep *ep = &htc->endpoint[eid];
248
249 if (htc->ar->state == ATH10K_STATE_WEDGED)
250 return -ECOMM;
251
252 if (eid >= ATH10K_HTC_EP_COUNT) {
253 ath10k_warn("Invalid endpoint id: %d\n", eid);
254 return -ENOENT;
255 }
256
257 spin_lock_bh(&htc->tx_lock);
258 if (htc->stopped) {
259 spin_unlock_bh(&htc->tx_lock);
260 return -ESHUTDOWN;
261 }
262
263 __skb_queue_tail(&ep->tx_queue, skb);
264 skb_push(skb, sizeof(struct ath10k_htc_hdr));
265 spin_unlock_bh(&htc->tx_lock);
266
267 queue_work(htc->ar->workqueue, &ep->send_work);
268 return 0;
269 }
270
271 static int ath10k_htc_tx_completion_handler(struct ath10k *ar,
272 struct sk_buff *skb,
273 unsigned int eid)
274 {
275 struct ath10k_htc *htc = &ar->htc;
276 struct ath10k_htc_ep *ep = &htc->endpoint[eid];
277
278 ath10k_htc_notify_tx_completion(ep, skb);
279 /* the skb now belongs to the completion handler */
280
281 /* note: when using TX credit flow, the re-checking of queues happens
282 * when credits flow back from the target. in the non-TX credit case,
283 * we recheck after the packet completes */
284 spin_lock_bh(&htc->tx_lock);
285 if (!ep->tx_credit_flow_enabled && !htc->stopped)
286 queue_work(ar->workqueue, &ep->send_work);
287 spin_unlock_bh(&htc->tx_lock);
288
289 return 0;
290 }
291
292 /* flush endpoint TX queue */
293 static void ath10k_htc_flush_endpoint_tx(struct ath10k_htc *htc,
294 struct ath10k_htc_ep *ep)
295 {
296 struct sk_buff *skb;
297 struct ath10k_skb_cb *skb_cb;
298
299 spin_lock_bh(&htc->tx_lock);
300 for (;;) {
301 skb = __skb_dequeue(&ep->tx_queue);
302 if (!skb)
303 break;
304
305 skb_cb = ATH10K_SKB_CB(skb);
306 skb_cb->is_aborted = true;
307 ath10k_htc_notify_tx_completion(ep, skb);
308 }
309 spin_unlock_bh(&htc->tx_lock);
310
311 cancel_work_sync(&ep->send_work);
312 }
313
314 /***********/
315 /* Receive */
316 /***********/
317
318 static void
319 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
320 const struct ath10k_htc_credit_report *report,
321 int len,
322 enum ath10k_htc_ep_id eid)
323 {
324 struct ath10k_htc_ep *ep;
325 int i, n_reports;
326
327 if (len % sizeof(*report))
328 ath10k_warn("Uneven credit report len %d", len);
329
330 n_reports = len / sizeof(*report);
331
332 spin_lock_bh(&htc->tx_lock);
333 for (i = 0; i < n_reports; i++, report++) {
334 if (report->eid >= ATH10K_HTC_EP_COUNT)
335 break;
336
337 ath10k_dbg(ATH10K_DBG_HTC, "ep %d got %d credits\n",
338 report->eid, report->credits);
339
340 ep = &htc->endpoint[report->eid];
341 ep->tx_credits += report->credits;
342
343 if (ep->tx_credits && !skb_queue_empty(&ep->tx_queue))
344 queue_work(htc->ar->workqueue, &ep->send_work);
345 }
346 spin_unlock_bh(&htc->tx_lock);
347 }
348
349 static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
350 u8 *buffer,
351 int length,
352 enum ath10k_htc_ep_id src_eid)
353 {
354 int status = 0;
355 struct ath10k_htc_record *record;
356 u8 *orig_buffer;
357 int orig_length;
358 size_t len;
359
360 orig_buffer = buffer;
361 orig_length = length;
362
363 while (length > 0) {
364 record = (struct ath10k_htc_record *)buffer;
365
366 if (length < sizeof(record->hdr)) {
367 status = -EINVAL;
368 break;
369 }
370
371 if (record->hdr.len > length) {
372 /* no room left in buffer for record */
373 ath10k_warn("Invalid record length: %d\n",
374 record->hdr.len);
375 status = -EINVAL;
376 break;
377 }
378
379 switch (record->hdr.id) {
380 case ATH10K_HTC_RECORD_CREDITS:
381 len = sizeof(struct ath10k_htc_credit_report);
382 if (record->hdr.len < len) {
383 ath10k_warn("Credit report too long\n");
384 status = -EINVAL;
385 break;
386 }
387 ath10k_htc_process_credit_report(htc,
388 record->credit_report,
389 record->hdr.len,
390 src_eid);
391 break;
392 default:
393 ath10k_warn("Unhandled record: id:%d length:%d\n",
394 record->hdr.id, record->hdr.len);
395 break;
396 }
397
398 if (status)
399 break;
400
401 /* multiple records may be present in a trailer */
402 buffer += sizeof(record->hdr) + record->hdr.len;
403 length -= sizeof(record->hdr) + record->hdr.len;
404 }
405
406 if (status)
407 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc rx bad trailer", "",
408 orig_buffer, orig_length);
409
410 return status;
411 }
412
413 static int ath10k_htc_rx_completion_handler(struct ath10k *ar,
414 struct sk_buff *skb,
415 u8 pipe_id)
416 {
417 int status = 0;
418 struct ath10k_htc *htc = &ar->htc;
419 struct ath10k_htc_hdr *hdr;
420 struct ath10k_htc_ep *ep;
421 u16 payload_len;
422 u32 trailer_len = 0;
423 size_t min_len;
424 u8 eid;
425 bool trailer_present;
426
427 hdr = (struct ath10k_htc_hdr *)skb->data;
428 skb_pull(skb, sizeof(*hdr));
429
430 eid = hdr->eid;
431
432 if (eid >= ATH10K_HTC_EP_COUNT) {
433 ath10k_warn("HTC Rx: invalid eid %d\n", eid);
434 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad header", "",
435 hdr, sizeof(*hdr));
436 status = -EINVAL;
437 goto out;
438 }
439
440 ep = &htc->endpoint[eid];
441
442 /*
443 * If this endpoint that received a message from the target has
444 * a to-target HIF pipe whose send completions are polled rather
445 * than interrupt-driven, this is a good point to ask HIF to check
446 * whether it has any completed sends to handle.
447 */
448 if (ep->ul_is_polled)
449 ath10k_htc_send_complete_check(ep, 1);
450
451 payload_len = __le16_to_cpu(hdr->len);
452
453 if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
454 ath10k_warn("HTC rx frame too long, len: %zu\n",
455 payload_len + sizeof(*hdr));
456 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len", "",
457 hdr, sizeof(*hdr));
458 status = -EINVAL;
459 goto out;
460 }
461
462 if (skb->len < payload_len) {
463 ath10k_dbg(ATH10K_DBG_HTC,
464 "HTC Rx: insufficient length, got %d, expected %d\n",
465 skb->len, payload_len);
466 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len",
467 "", hdr, sizeof(*hdr));
468 status = -EINVAL;
469 goto out;
470 }
471
472 /* get flags to check for trailer */
473 trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
474 if (trailer_present) {
475 u8 *trailer;
476
477 trailer_len = hdr->trailer_len;
478 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
479
480 if ((trailer_len < min_len) ||
481 (trailer_len > payload_len)) {
482 ath10k_warn("Invalid trailer length: %d\n",
483 trailer_len);
484 status = -EPROTO;
485 goto out;
486 }
487
488 trailer = (u8 *)hdr;
489 trailer += sizeof(*hdr);
490 trailer += payload_len;
491 trailer -= trailer_len;
492 status = ath10k_htc_process_trailer(htc, trailer,
493 trailer_len, hdr->eid);
494 if (status)
495 goto out;
496
497 skb_trim(skb, skb->len - trailer_len);
498 }
499
500 if (((int)payload_len - (int)trailer_len) <= 0)
501 /* zero length packet with trailer data, just drop these */
502 goto out;
503
504 if (eid == ATH10K_HTC_EP_0) {
505 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
506
507 switch (__le16_to_cpu(msg->hdr.message_id)) {
508 default:
509 /* handle HTC control message */
510 if (completion_done(&htc->ctl_resp)) {
511 /*
512 * this is a fatal error, target should not be
513 * sending unsolicited messages on the ep 0
514 */
515 ath10k_warn("HTC rx ctrl still processing\n");
516 status = -EINVAL;
517 complete(&htc->ctl_resp);
518 goto out;
519 }
520
521 htc->control_resp_len =
522 min_t(int, skb->len,
523 ATH10K_HTC_MAX_CTRL_MSG_LEN);
524
525 memcpy(htc->control_resp_buffer, skb->data,
526 htc->control_resp_len);
527
528 complete(&htc->ctl_resp);
529 break;
530 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
531 htc->htc_ops.target_send_suspend_complete(ar);
532 }
533 goto out;
534 }
535
536 ath10k_dbg(ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
537 eid, skb);
538 ep->ep_ops.ep_rx_complete(ar, skb);
539
540 /* skb is now owned by the rx completion handler */
541 skb = NULL;
542 out:
543 kfree_skb(skb);
544
545 return status;
546 }
547
548 static void ath10k_htc_control_rx_complete(struct ath10k *ar,
549 struct sk_buff *skb)
550 {
551 /* This is unexpected. FW is not supposed to send regular rx on this
552 * endpoint. */
553 ath10k_warn("unexpected htc rx\n");
554 kfree_skb(skb);
555 }
556
557 /***************/
558 /* Init/Deinit */
559 /***************/
560
561 static const char *htc_service_name(enum ath10k_htc_svc_id id)
562 {
563 switch (id) {
564 case ATH10K_HTC_SVC_ID_RESERVED:
565 return "Reserved";
566 case ATH10K_HTC_SVC_ID_RSVD_CTRL:
567 return "Control";
568 case ATH10K_HTC_SVC_ID_WMI_CONTROL:
569 return "WMI";
570 case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
571 return "DATA BE";
572 case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
573 return "DATA BK";
574 case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
575 return "DATA VI";
576 case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
577 return "DATA VO";
578 case ATH10K_HTC_SVC_ID_NMI_CONTROL:
579 return "NMI Control";
580 case ATH10K_HTC_SVC_ID_NMI_DATA:
581 return "NMI Data";
582 case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
583 return "HTT Data";
584 case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
585 return "RAW";
586 }
587
588 return "Unknown";
589 }
590
591 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
592 {
593 struct ath10k_htc_ep *ep;
594 int i;
595
596 for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
597 ep = &htc->endpoint[i];
598 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
599 ep->max_ep_message_len = 0;
600 ep->max_tx_queue_depth = 0;
601 ep->eid = i;
602 skb_queue_head_init(&ep->tx_queue);
603 ep->htc = htc;
604 ep->tx_credit_flow_enabled = true;
605 INIT_WORK(&ep->send_work, ath10k_htc_send_work);
606 }
607 }
608
609 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
610 {
611 struct ath10k_htc_svc_tx_credits *entry;
612
613 entry = &htc->service_tx_alloc[0];
614
615 /*
616 * for PCIE allocate all credists/HTC buffers to WMI.
617 * no buffers are used/required for data. data always
618 * remains on host.
619 */
620 entry++;
621 entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
622 entry->credit_allocation = htc->total_transmit_credits;
623 }
624
625 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
626 u16 service_id)
627 {
628 u8 allocation = 0;
629 int i;
630
631 for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
632 if (htc->service_tx_alloc[i].service_id == service_id)
633 allocation =
634 htc->service_tx_alloc[i].credit_allocation;
635 }
636
637 return allocation;
638 }
639
640 int ath10k_htc_wait_target(struct ath10k_htc *htc)
641 {
642 int status = 0;
643 struct ath10k_htc_svc_conn_req conn_req;
644 struct ath10k_htc_svc_conn_resp conn_resp;
645 struct ath10k_htc_msg *msg;
646 u16 message_id;
647 u16 credit_count;
648 u16 credit_size;
649
650 INIT_COMPLETION(htc->ctl_resp);
651
652 status = ath10k_hif_start(htc->ar);
653 if (status) {
654 ath10k_err("could not start HIF (%d)\n", status);
655 goto err_start;
656 }
657
658 status = wait_for_completion_timeout(&htc->ctl_resp,
659 ATH10K_HTC_WAIT_TIMEOUT_HZ);
660 if (status <= 0) {
661 if (status == 0)
662 status = -ETIMEDOUT;
663
664 ath10k_err("ctl_resp never came in (%d)\n", status);
665 goto err_target;
666 }
667
668 if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
669 ath10k_err("Invalid HTC ready msg len:%d\n",
670 htc->control_resp_len);
671
672 status = -ECOMM;
673 goto err_target;
674 }
675
676 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
677 message_id = __le16_to_cpu(msg->hdr.message_id);
678 credit_count = __le16_to_cpu(msg->ready.credit_count);
679 credit_size = __le16_to_cpu(msg->ready.credit_size);
680
681 if (message_id != ATH10K_HTC_MSG_READY_ID) {
682 ath10k_err("Invalid HTC ready msg: 0x%x\n", message_id);
683 status = -ECOMM;
684 goto err_target;
685 }
686
687 htc->total_transmit_credits = credit_count;
688 htc->target_credit_size = credit_size;
689
690 ath10k_dbg(ATH10K_DBG_HTC,
691 "Target ready! transmit resources: %d size:%d\n",
692 htc->total_transmit_credits,
693 htc->target_credit_size);
694
695 if ((htc->total_transmit_credits == 0) ||
696 (htc->target_credit_size == 0)) {
697 status = -ECOMM;
698 ath10k_err("Invalid credit size received\n");
699 goto err_target;
700 }
701
702 ath10k_htc_setup_target_buffer_assignments(htc);
703
704 /* setup our pseudo HTC control endpoint connection */
705 memset(&conn_req, 0, sizeof(conn_req));
706 memset(&conn_resp, 0, sizeof(conn_resp));
707 conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
708 conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
709 conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
710 conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
711
712 /* connect fake service */
713 status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
714 if (status) {
715 ath10k_err("could not connect to htc service (%d)\n", status);
716 goto err_target;
717 }
718
719 return 0;
720 err_target:
721 ath10k_hif_stop(htc->ar);
722 err_start:
723 return status;
724 }
725
726 int ath10k_htc_connect_service(struct ath10k_htc *htc,
727 struct ath10k_htc_svc_conn_req *conn_req,
728 struct ath10k_htc_svc_conn_resp *conn_resp)
729 {
730 struct ath10k_htc_msg *msg;
731 struct ath10k_htc_conn_svc *req_msg;
732 struct ath10k_htc_conn_svc_response resp_msg_dummy;
733 struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
734 enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
735 struct ath10k_htc_ep *ep;
736 struct sk_buff *skb;
737 unsigned int max_msg_size = 0;
738 int length, status;
739 bool disable_credit_flow_ctrl = false;
740 u16 message_id, service_id, flags = 0;
741 u8 tx_alloc = 0;
742
743 /* special case for HTC pseudo control service */
744 if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
745 disable_credit_flow_ctrl = true;
746 assigned_eid = ATH10K_HTC_EP_0;
747 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
748 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
749 goto setup;
750 }
751
752 tx_alloc = ath10k_htc_get_credit_allocation(htc,
753 conn_req->service_id);
754 if (!tx_alloc)
755 ath10k_dbg(ATH10K_DBG_HTC,
756 "HTC Service %s does not allocate target credits\n",
757 htc_service_name(conn_req->service_id));
758
759 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
760 if (!skb) {
761 ath10k_err("Failed to allocate HTC packet\n");
762 return -ENOMEM;
763 }
764
765 length = sizeof(msg->hdr) + sizeof(msg->connect_service);
766 skb_put(skb, length);
767 memset(skb->data, 0, length);
768
769 msg = (struct ath10k_htc_msg *)skb->data;
770 msg->hdr.message_id =
771 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
772
773 flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
774
775 req_msg = &msg->connect_service;
776 req_msg->flags = __cpu_to_le16(flags);
777 req_msg->service_id = __cpu_to_le16(conn_req->service_id);
778
779 /* Only enable credit flow control for WMI ctrl service */
780 if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
781 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
782 disable_credit_flow_ctrl = true;
783 }
784
785 INIT_COMPLETION(htc->ctl_resp);
786
787 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
788 if (status) {
789 kfree_skb(skb);
790 return status;
791 }
792
793 /* wait for response */
794 status = wait_for_completion_timeout(&htc->ctl_resp,
795 ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
796 if (status <= 0) {
797 if (status == 0)
798 status = -ETIMEDOUT;
799 ath10k_err("Service connect timeout: %d\n", status);
800 return status;
801 }
802
803 /* we controlled the buffer creation, it's aligned */
804 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
805 resp_msg = &msg->connect_service_response;
806 message_id = __le16_to_cpu(msg->hdr.message_id);
807 service_id = __le16_to_cpu(resp_msg->service_id);
808
809 if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
810 (htc->control_resp_len < sizeof(msg->hdr) +
811 sizeof(msg->connect_service_response))) {
812 ath10k_err("Invalid resp message ID 0x%x", message_id);
813 return -EPROTO;
814 }
815
816 ath10k_dbg(ATH10K_DBG_HTC,
817 "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
818 htc_service_name(service_id),
819 resp_msg->status, resp_msg->eid);
820
821 conn_resp->connect_resp_code = resp_msg->status;
822
823 /* check response status */
824 if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
825 ath10k_err("HTC Service %s connect request failed: 0x%x)\n",
826 htc_service_name(service_id),
827 resp_msg->status);
828 return -EPROTO;
829 }
830
831 assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
832 max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
833
834 setup:
835
836 if (assigned_eid >= ATH10K_HTC_EP_COUNT)
837 return -EPROTO;
838
839 if (max_msg_size == 0)
840 return -EPROTO;
841
842 ep = &htc->endpoint[assigned_eid];
843 ep->eid = assigned_eid;
844
845 if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
846 return -EPROTO;
847
848 /* return assigned endpoint to caller */
849 conn_resp->eid = assigned_eid;
850 conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
851
852 /* setup the endpoint */
853 ep->service_id = conn_req->service_id;
854 ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
855 ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
856 ep->tx_credits = tx_alloc;
857 ep->tx_credit_size = htc->target_credit_size;
858 ep->tx_credits_per_max_message = ep->max_ep_message_len /
859 htc->target_credit_size;
860
861 if (ep->max_ep_message_len % htc->target_credit_size)
862 ep->tx_credits_per_max_message++;
863
864 /* copy all the callbacks */
865 ep->ep_ops = conn_req->ep_ops;
866
867 status = ath10k_hif_map_service_to_pipe(htc->ar,
868 ep->service_id,
869 &ep->ul_pipe_id,
870 &ep->dl_pipe_id,
871 &ep->ul_is_polled,
872 &ep->dl_is_polled);
873 if (status)
874 return status;
875
876 ath10k_dbg(ATH10K_DBG_HTC,
877 "HTC service: %s UL pipe: %d DL pipe: %d eid: %d ready\n",
878 htc_service_name(ep->service_id), ep->ul_pipe_id,
879 ep->dl_pipe_id, ep->eid);
880
881 ath10k_dbg(ATH10K_DBG_HTC,
882 "EP %d UL polled: %d, DL polled: %d\n",
883 ep->eid, ep->ul_is_polled, ep->dl_is_polled);
884
885 if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
886 ep->tx_credit_flow_enabled = false;
887 ath10k_dbg(ATH10K_DBG_HTC,
888 "HTC service: %s eid: %d TX flow control disabled\n",
889 htc_service_name(ep->service_id), assigned_eid);
890 }
891
892 return status;
893 }
894
895 struct sk_buff *ath10k_htc_alloc_skb(int size)
896 {
897 struct sk_buff *skb;
898
899 skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
900 if (!skb) {
901 ath10k_warn("could not allocate HTC tx skb\n");
902 return NULL;
903 }
904
905 skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
906
907 /* FW/HTC requires 4-byte aligned streams */
908 if (!IS_ALIGNED((unsigned long)skb->data, 4))
909 ath10k_warn("Unaligned HTC tx skb\n");
910
911 return skb;
912 }
913
914 int ath10k_htc_start(struct ath10k_htc *htc)
915 {
916 struct sk_buff *skb;
917 int status = 0;
918 struct ath10k_htc_msg *msg;
919
920 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
921 if (!skb)
922 return -ENOMEM;
923
924 skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
925 memset(skb->data, 0, skb->len);
926
927 msg = (struct ath10k_htc_msg *)skb->data;
928 msg->hdr.message_id =
929 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
930
931 ath10k_dbg(ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
932
933 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
934 if (status) {
935 kfree_skb(skb);
936 return status;
937 }
938
939 return 0;
940 }
941
942 /*
943 * stop HTC communications, i.e. stop interrupt reception, and flush all
944 * queued buffers
945 */
946 void ath10k_htc_stop(struct ath10k_htc *htc)
947 {
948 int i;
949 struct ath10k_htc_ep *ep;
950
951 spin_lock_bh(&htc->tx_lock);
952 htc->stopped = true;
953 spin_unlock_bh(&htc->tx_lock);
954
955 for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
956 ep = &htc->endpoint[i];
957 ath10k_htc_flush_endpoint_tx(htc, ep);
958 }
959
960 ath10k_hif_stop(htc->ar);
961 }
962
963 /* registered target arrival callback from the HIF layer */
964 int ath10k_htc_init(struct ath10k *ar)
965 {
966 struct ath10k_hif_cb htc_callbacks;
967 struct ath10k_htc_ep *ep = NULL;
968 struct ath10k_htc *htc = &ar->htc;
969
970 spin_lock_init(&htc->tx_lock);
971
972 htc->stopped = false;
973 ath10k_htc_reset_endpoint_states(htc);
974
975 /* setup HIF layer callbacks */
976 htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
977 htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
978 htc->ar = ar;
979
980 /* Get HIF default pipe for HTC message exchange */
981 ep = &htc->endpoint[ATH10K_HTC_EP_0];
982
983 ath10k_hif_set_callbacks(ar, &htc_callbacks);
984 ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
985
986 init_completion(&htc->ctl_resp);
987
988 return 0;
989 }
Linux with added FPC-III support