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Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge
[deliverable/linux.git] / drivers / net / wireless / ath / ath6kl / htc.c
1 /*
2 * Copyright (c) 2007-2011 Atheros Communications Inc.
3 * Copyright (c) 2011-2012 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 #include "hif-ops.h"
22 #include <asm/unaligned.h>
23
24 #define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask))
25
26 /* threshold to re-enable Tx bundling for an AC*/
27 #define TX_RESUME_BUNDLE_THRESHOLD 1500
28
29 /* Functions for Tx credit handling */
30 static void ath6kl_credit_deposit(struct ath6kl_htc_credit_info *cred_info,
31 struct htc_endpoint_credit_dist *ep_dist,
32 int credits)
33 {
34 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit deposit ep %d credits %d\n",
35 ep_dist->endpoint, credits);
36
37 ep_dist->credits += credits;
38 ep_dist->cred_assngd += credits;
39 cred_info->cur_free_credits -= credits;
40 }
41
42 static void ath6kl_credit_init(struct ath6kl_htc_credit_info *cred_info,
43 struct list_head *ep_list,
44 int tot_credits)
45 {
46 struct htc_endpoint_credit_dist *cur_ep_dist;
47 int count;
48
49 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit init total %d\n", tot_credits);
50
51 cred_info->cur_free_credits = tot_credits;
52 cred_info->total_avail_credits = tot_credits;
53
54 list_for_each_entry(cur_ep_dist, ep_list, list) {
55 if (cur_ep_dist->endpoint == ENDPOINT_0)
56 continue;
57
58 cur_ep_dist->cred_min = cur_ep_dist->cred_per_msg;
59
60 if (tot_credits > 4) {
61 if ((cur_ep_dist->svc_id == WMI_DATA_BK_SVC) ||
62 (cur_ep_dist->svc_id == WMI_DATA_BE_SVC)) {
63 ath6kl_credit_deposit(cred_info,
64 cur_ep_dist,
65 cur_ep_dist->cred_min);
66 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
67 }
68 }
69
70 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) {
71 ath6kl_credit_deposit(cred_info, cur_ep_dist,
72 cur_ep_dist->cred_min);
73 /*
74 * Control service is always marked active, it
75 * never goes inactive EVER.
76 */
77 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
78 } else if (cur_ep_dist->svc_id == WMI_DATA_BK_SVC)
79 /* this is the lowest priority data endpoint */
80 /* FIXME: this looks fishy, check */
81 cred_info->lowestpri_ep_dist = cur_ep_dist->list;
82
83 /*
84 * Streams have to be created (explicit | implicit) for all
85 * kinds of traffic. BE endpoints are also inactive in the
86 * beginning. When BE traffic starts it creates implicit
87 * streams that redistributes credits.
88 *
89 * Note: all other endpoints have minimums set but are
90 * initially given NO credits. credits will be distributed
91 * as traffic activity demands
92 */
93 }
94
95 WARN_ON(cred_info->cur_free_credits <= 0);
96
97 list_for_each_entry(cur_ep_dist, ep_list, list) {
98 if (cur_ep_dist->endpoint == ENDPOINT_0)
99 continue;
100
101 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC)
102 cur_ep_dist->cred_norm = cur_ep_dist->cred_per_msg;
103 else {
104 /*
105 * For the remaining data endpoints, we assume that
106 * each cred_per_msg are the same. We use a simple
107 * calculation here, we take the remaining credits
108 * and determine how many max messages this can
109 * cover and then set each endpoint's normal value
110 * equal to 3/4 this amount.
111 */
112 count = (cred_info->cur_free_credits /
113 cur_ep_dist->cred_per_msg)
114 * cur_ep_dist->cred_per_msg;
115 count = (count * 3) >> 2;
116 count = max(count, cur_ep_dist->cred_per_msg);
117 cur_ep_dist->cred_norm = count;
118
119 }
120
121 ath6kl_dbg(ATH6KL_DBG_CREDIT,
122 "credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n",
123 cur_ep_dist->endpoint,
124 cur_ep_dist->svc_id,
125 cur_ep_dist->credits,
126 cur_ep_dist->cred_per_msg,
127 cur_ep_dist->cred_norm,
128 cur_ep_dist->cred_min);
129 }
130 }
131
132 /* initialize and setup credit distribution */
133 int ath6kl_credit_setup(void *htc_handle,
134 struct ath6kl_htc_credit_info *cred_info)
135 {
136 u16 servicepriority[5];
137
138 memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info));
139
140 servicepriority[0] = WMI_CONTROL_SVC; /* highest */
141 servicepriority[1] = WMI_DATA_VO_SVC;
142 servicepriority[2] = WMI_DATA_VI_SVC;
143 servicepriority[3] = WMI_DATA_BE_SVC;
144 servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */
145
146 /* set priority list */
147 ath6kl_htc_set_credit_dist(htc_handle, cred_info, servicepriority, 5);
148
149 return 0;
150 }
151
152 /* reduce an ep's credits back to a set limit */
153 static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info,
154 struct htc_endpoint_credit_dist *ep_dist,
155 int limit)
156 {
157 int credits;
158
159 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n",
160 ep_dist->endpoint, limit);
161
162 ep_dist->cred_assngd = limit;
163
164 if (ep_dist->credits <= limit)
165 return;
166
167 credits = ep_dist->credits - limit;
168 ep_dist->credits -= credits;
169 cred_info->cur_free_credits += credits;
170 }
171
172 static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info,
173 struct list_head *epdist_list)
174 {
175 struct htc_endpoint_credit_dist *cur_list;
176
177 list_for_each_entry(cur_list, epdist_list, list) {
178 if (cur_list->endpoint == ENDPOINT_0)
179 continue;
180
181 if (cur_list->cred_to_dist > 0) {
182 cur_list->credits += cur_list->cred_to_dist;
183 cur_list->cred_to_dist = 0;
184
185 if (cur_list->credits > cur_list->cred_assngd)
186 ath6kl_credit_reduce(cred_info,
187 cur_list,
188 cur_list->cred_assngd);
189
190 if (cur_list->credits > cur_list->cred_norm)
191 ath6kl_credit_reduce(cred_info, cur_list,
192 cur_list->cred_norm);
193
194 if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) {
195 if (cur_list->txq_depth == 0)
196 ath6kl_credit_reduce(cred_info,
197 cur_list, 0);
198 }
199 }
200 }
201 }
202
203 /*
204 * HTC has an endpoint that needs credits, ep_dist is the endpoint in
205 * question.
206 */
207 static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info,
208 struct htc_endpoint_credit_dist *ep_dist)
209 {
210 struct htc_endpoint_credit_dist *curdist_list;
211 int credits = 0;
212 int need;
213
214 if (ep_dist->svc_id == WMI_CONTROL_SVC)
215 goto out;
216
217 if ((ep_dist->svc_id == WMI_DATA_VI_SVC) ||
218 (ep_dist->svc_id == WMI_DATA_VO_SVC))
219 if ((ep_dist->cred_assngd >= ep_dist->cred_norm))
220 goto out;
221
222 /*
223 * For all other services, we follow a simple algorithm of:
224 *
225 * 1. checking the free pool for credits
226 * 2. checking lower priority endpoints for credits to take
227 */
228
229 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
230
231 if (credits >= ep_dist->seek_cred)
232 goto out;
233
234 /*
235 * We don't have enough in the free pool, try taking away from
236 * lower priority services The rule for taking away credits:
237 *
238 * 1. Only take from lower priority endpoints
239 * 2. Only take what is allocated above the minimum (never
240 * starve an endpoint completely)
241 * 3. Only take what you need.
242 */
243
244 list_for_each_entry_reverse(curdist_list,
245 &cred_info->lowestpri_ep_dist,
246 list) {
247 if (curdist_list == ep_dist)
248 break;
249
250 need = ep_dist->seek_cred - cred_info->cur_free_credits;
251
252 if ((curdist_list->cred_assngd - need) >=
253 curdist_list->cred_min) {
254 /*
255 * The current one has been allocated more than
256 * it's minimum and it has enough credits assigned
257 * above it's minimum to fulfill our need try to
258 * take away just enough to fulfill our need.
259 */
260 ath6kl_credit_reduce(cred_info, curdist_list,
261 curdist_list->cred_assngd - need);
262
263 if (cred_info->cur_free_credits >=
264 ep_dist->seek_cred)
265 break;
266 }
267
268 if (curdist_list->endpoint == ENDPOINT_0)
269 break;
270 }
271
272 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
273
274 out:
275 /* did we find some credits? */
276 if (credits)
277 ath6kl_credit_deposit(cred_info, ep_dist, credits);
278
279 ep_dist->seek_cred = 0;
280 }
281
282 /* redistribute credits based on activity change */
283 static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info,
284 struct list_head *ep_dist_list)
285 {
286 struct htc_endpoint_credit_dist *curdist_list;
287
288 list_for_each_entry(curdist_list, ep_dist_list, list) {
289 if (curdist_list->endpoint == ENDPOINT_0)
290 continue;
291
292 if ((curdist_list->svc_id == WMI_DATA_BK_SVC) ||
293 (curdist_list->svc_id == WMI_DATA_BE_SVC))
294 curdist_list->dist_flags |= HTC_EP_ACTIVE;
295
296 if ((curdist_list->svc_id != WMI_CONTROL_SVC) &&
297 !(curdist_list->dist_flags & HTC_EP_ACTIVE)) {
298 if (curdist_list->txq_depth == 0)
299 ath6kl_credit_reduce(info, curdist_list, 0);
300 else
301 ath6kl_credit_reduce(info,
302 curdist_list,
303 curdist_list->cred_min);
304 }
305 }
306 }
307
308 /*
309 *
310 * This function is invoked whenever endpoints require credit
311 * distributions. A lock is held while this function is invoked, this
312 * function shall NOT block. The ep_dist_list is a list of distribution
313 * structures in prioritized order as defined by the call to the
314 * htc_set_credit_dist() api.
315 */
316 static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info,
317 struct list_head *ep_dist_list,
318 enum htc_credit_dist_reason reason)
319 {
320 switch (reason) {
321 case HTC_CREDIT_DIST_SEND_COMPLETE:
322 ath6kl_credit_update(cred_info, ep_dist_list);
323 break;
324 case HTC_CREDIT_DIST_ACTIVITY_CHANGE:
325 ath6kl_credit_redistribute(cred_info, ep_dist_list);
326 break;
327 default:
328 break;
329 }
330
331 WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits);
332 WARN_ON(cred_info->cur_free_credits < 0);
333 }
334
335 static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len)
336 {
337 u8 *align_addr;
338
339 if (!IS_ALIGNED((unsigned long) *buf, 4)) {
340 align_addr = PTR_ALIGN(*buf - 4, 4);
341 memmove(align_addr, *buf, len);
342 *buf = align_addr;
343 }
344 }
345
346 static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags,
347 int ctrl0, int ctrl1)
348 {
349 struct htc_frame_hdr *hdr;
350
351 packet->buf -= HTC_HDR_LENGTH;
352 hdr = (struct htc_frame_hdr *)packet->buf;
353
354 /* Endianess? */
355 put_unaligned((u16)packet->act_len, &hdr->payld_len);
356 hdr->flags = flags;
357 hdr->eid = packet->endpoint;
358 hdr->ctrl[0] = ctrl0;
359 hdr->ctrl[1] = ctrl1;
360 }
361
362 static void htc_reclaim_txctrl_buf(struct htc_target *target,
363 struct htc_packet *pkt)
364 {
365 spin_lock_bh(&target->htc_lock);
366 list_add_tail(&pkt->list, &target->free_ctrl_txbuf);
367 spin_unlock_bh(&target->htc_lock);
368 }
369
370 static struct htc_packet *htc_get_control_buf(struct htc_target *target,
371 bool tx)
372 {
373 struct htc_packet *packet = NULL;
374 struct list_head *buf_list;
375
376 buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf;
377
378 spin_lock_bh(&target->htc_lock);
379
380 if (list_empty(buf_list)) {
381 spin_unlock_bh(&target->htc_lock);
382 return NULL;
383 }
384
385 packet = list_first_entry(buf_list, struct htc_packet, list);
386 list_del(&packet->list);
387 spin_unlock_bh(&target->htc_lock);
388
389 if (tx)
390 packet->buf = packet->buf_start + HTC_HDR_LENGTH;
391
392 return packet;
393 }
394
395 static void htc_tx_comp_update(struct htc_target *target,
396 struct htc_endpoint *endpoint,
397 struct htc_packet *packet)
398 {
399 packet->completion = NULL;
400 packet->buf += HTC_HDR_LENGTH;
401
402 if (!packet->status)
403 return;
404
405 ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n",
406 packet->status, packet->endpoint, packet->act_len,
407 packet->info.tx.cred_used);
408
409 /* on failure to submit, reclaim credits for this packet */
410 spin_lock_bh(&target->tx_lock);
411 endpoint->cred_dist.cred_to_dist +=
412 packet->info.tx.cred_used;
413 endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq);
414
415 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n",
416 target->credit_info, &target->cred_dist_list);
417
418 ath6kl_credit_distribute(target->credit_info,
419 &target->cred_dist_list,
420 HTC_CREDIT_DIST_SEND_COMPLETE);
421
422 spin_unlock_bh(&target->tx_lock);
423 }
424
425 static void htc_tx_complete(struct htc_endpoint *endpoint,
426 struct list_head *txq)
427 {
428 if (list_empty(txq))
429 return;
430
431 ath6kl_dbg(ATH6KL_DBG_HTC,
432 "htc tx complete ep %d pkts %d\n",
433 endpoint->eid, get_queue_depth(txq));
434
435 ath6kl_tx_complete(endpoint->target->dev->ar, txq);
436 }
437
438 static void htc_tx_comp_handler(struct htc_target *target,
439 struct htc_packet *packet)
440 {
441 struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint];
442 struct list_head container;
443
444 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n",
445 packet->info.tx.seqno);
446
447 htc_tx_comp_update(target, endpoint, packet);
448 INIT_LIST_HEAD(&container);
449 list_add_tail(&packet->list, &container);
450 /* do completion */
451 htc_tx_complete(endpoint, &container);
452 }
453
454 static void htc_async_tx_scat_complete(struct htc_target *target,
455 struct hif_scatter_req *scat_req)
456 {
457 struct htc_endpoint *endpoint;
458 struct htc_packet *packet;
459 struct list_head tx_compq;
460 int i;
461
462 INIT_LIST_HEAD(&tx_compq);
463
464 ath6kl_dbg(ATH6KL_DBG_HTC,
465 "htc tx scat complete len %d entries %d\n",
466 scat_req->len, scat_req->scat_entries);
467
468 if (scat_req->status)
469 ath6kl_err("send scatter req failed: %d\n", scat_req->status);
470
471 packet = scat_req->scat_list[0].packet;
472 endpoint = &target->endpoint[packet->endpoint];
473
474 /* walk through the scatter list and process */
475 for (i = 0; i < scat_req->scat_entries; i++) {
476 packet = scat_req->scat_list[i].packet;
477 if (!packet) {
478 WARN_ON(1);
479 return;
480 }
481
482 packet->status = scat_req->status;
483 htc_tx_comp_update(target, endpoint, packet);
484 list_add_tail(&packet->list, &tx_compq);
485 }
486
487 /* free scatter request */
488 hif_scatter_req_add(target->dev->ar, scat_req);
489
490 /* complete all packets */
491 htc_tx_complete(endpoint, &tx_compq);
492 }
493
494 static int ath6kl_htc_tx_issue(struct htc_target *target,
495 struct htc_packet *packet)
496 {
497 int status;
498 bool sync = false;
499 u32 padded_len, send_len;
500
501 if (!packet->completion)
502 sync = true;
503
504 send_len = packet->act_len + HTC_HDR_LENGTH;
505
506 padded_len = CALC_TXRX_PADDED_LEN(target, send_len);
507
508 ath6kl_dbg(ATH6KL_DBG_HTC,
509 "htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n",
510 send_len, packet->info.tx.seqno, padded_len,
511 target->dev->ar->mbox_info.htc_addr,
512 sync ? "sync" : "async");
513
514 if (sync) {
515 status = hif_read_write_sync(target->dev->ar,
516 target->dev->ar->mbox_info.htc_addr,
517 packet->buf, padded_len,
518 HIF_WR_SYNC_BLOCK_INC);
519
520 packet->status = status;
521 packet->buf += HTC_HDR_LENGTH;
522 } else
523 status = hif_write_async(target->dev->ar,
524 target->dev->ar->mbox_info.htc_addr,
525 packet->buf, padded_len,
526 HIF_WR_ASYNC_BLOCK_INC, packet);
527
528 return status;
529 }
530
531 static int htc_check_credits(struct htc_target *target,
532 struct htc_endpoint *ep, u8 *flags,
533 enum htc_endpoint_id eid, unsigned int len,
534 int *req_cred)
535 {
536
537 *req_cred = (len > target->tgt_cred_sz) ?
538 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1;
539
540 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n",
541 *req_cred, ep->cred_dist.credits);
542
543 if (ep->cred_dist.credits < *req_cred) {
544 if (eid == ENDPOINT_0)
545 return -EINVAL;
546
547 /* Seek more credits */
548 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits;
549
550 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
551
552 ep->cred_dist.seek_cred = 0;
553
554 if (ep->cred_dist.credits < *req_cred) {
555 ath6kl_dbg(ATH6KL_DBG_CREDIT,
556 "credit not found for ep %d\n",
557 eid);
558 return -EINVAL;
559 }
560 }
561
562 ep->cred_dist.credits -= *req_cred;
563 ep->ep_st.cred_cosumd += *req_cred;
564
565 /* When we are getting low on credits, ask for more */
566 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
567 ep->cred_dist.seek_cred =
568 ep->cred_dist.cred_per_msg - ep->cred_dist.credits;
569
570 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
571
572 /* see if we were successful in getting more */
573 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
574 /* tell the target we need credits ASAP! */
575 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
576 ep->ep_st.cred_low_indicate += 1;
577 ath6kl_dbg(ATH6KL_DBG_CREDIT,
578 "credit we need credits asap\n");
579 }
580 }
581
582 return 0;
583 }
584
585 static void ath6kl_htc_tx_pkts_get(struct htc_target *target,
586 struct htc_endpoint *endpoint,
587 struct list_head *queue)
588 {
589 int req_cred;
590 u8 flags;
591 struct htc_packet *packet;
592 unsigned int len;
593
594 while (true) {
595
596 flags = 0;
597
598 if (list_empty(&endpoint->txq))
599 break;
600 packet = list_first_entry(&endpoint->txq, struct htc_packet,
601 list);
602
603 ath6kl_dbg(ATH6KL_DBG_HTC,
604 "htc tx got packet 0x%p queue depth %d\n",
605 packet, get_queue_depth(&endpoint->txq));
606
607 len = CALC_TXRX_PADDED_LEN(target,
608 packet->act_len + HTC_HDR_LENGTH);
609
610 if (htc_check_credits(target, endpoint, &flags,
611 packet->endpoint, len, &req_cred))
612 break;
613
614 /* now we can fully move onto caller's queue */
615 packet = list_first_entry(&endpoint->txq, struct htc_packet,
616 list);
617 list_move_tail(&packet->list, queue);
618
619 /* save the number of credits this packet consumed */
620 packet->info.tx.cred_used = req_cred;
621
622 /* all TX packets are handled asynchronously */
623 packet->completion = htc_tx_comp_handler;
624 packet->context = target;
625 endpoint->ep_st.tx_issued += 1;
626
627 /* save send flags */
628 packet->info.tx.flags = flags;
629 packet->info.tx.seqno = endpoint->seqno;
630 endpoint->seqno++;
631 }
632 }
633
634 /* See if the padded tx length falls on a credit boundary */
635 static int htc_get_credit_padding(unsigned int cred_sz, int *len,
636 struct htc_endpoint *ep)
637 {
638 int rem_cred, cred_pad;
639
640 rem_cred = *len % cred_sz;
641
642 /* No padding needed */
643 if (!rem_cred)
644 return 0;
645
646 if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN))
647 return -1;
648
649 /*
650 * The transfer consumes a "partial" credit, this
651 * packet cannot be bundled unless we add
652 * additional "dummy" padding (max 255 bytes) to
653 * consume the entire credit.
654 */
655 cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred;
656
657 if ((cred_pad > 0) && (cred_pad <= 255))
658 *len += cred_pad;
659 else
660 /* The amount of padding is too large, send as non-bundled */
661 return -1;
662
663 return cred_pad;
664 }
665
666 static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target,
667 struct htc_endpoint *endpoint,
668 struct hif_scatter_req *scat_req,
669 int n_scat,
670 struct list_head *queue)
671 {
672 struct htc_packet *packet;
673 int i, len, rem_scat, cred_pad;
674 int status = 0;
675 u8 flags;
676
677 rem_scat = target->max_tx_bndl_sz;
678
679 for (i = 0; i < n_scat; i++) {
680 scat_req->scat_list[i].packet = NULL;
681
682 if (list_empty(queue))
683 break;
684
685 packet = list_first_entry(queue, struct htc_packet, list);
686 len = CALC_TXRX_PADDED_LEN(target,
687 packet->act_len + HTC_HDR_LENGTH);
688
689 cred_pad = htc_get_credit_padding(target->tgt_cred_sz,
690 &len, endpoint);
691 if (cred_pad < 0 || rem_scat < len) {
692 status = -ENOSPC;
693 break;
694 }
695
696 rem_scat -= len;
697 /* now remove it from the queue */
698 list_del(&packet->list);
699
700 scat_req->scat_list[i].packet = packet;
701 /* prepare packet and flag message as part of a send bundle */
702 flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE;
703 ath6kl_htc_tx_prep_pkt(packet, flags,
704 cred_pad, packet->info.tx.seqno);
705 /* Make sure the buffer is 4-byte aligned */
706 ath6kl_htc_tx_buf_align(&packet->buf,
707 packet->act_len + HTC_HDR_LENGTH);
708 scat_req->scat_list[i].buf = packet->buf;
709 scat_req->scat_list[i].len = len;
710
711 scat_req->len += len;
712 scat_req->scat_entries++;
713 ath6kl_dbg(ATH6KL_DBG_HTC,
714 "htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n",
715 i, packet, packet->info.tx.seqno, len, rem_scat);
716 }
717
718 /* Roll back scatter setup in case of any failure */
719 if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) {
720 for (i = scat_req->scat_entries - 1; i >= 0; i--) {
721 packet = scat_req->scat_list[i].packet;
722 if (packet) {
723 packet->buf += HTC_HDR_LENGTH;
724 list_add(&packet->list, queue);
725 }
726 }
727 return -EAGAIN;
728 }
729
730 return status;
731 }
732
733 /*
734 * Drain a queue and send as bundles this function may return without fully
735 * draining the queue when
736 *
737 * 1. scatter resources are exhausted
738 * 2. a message that will consume a partial credit will stop the
739 * bundling process early
740 * 3. we drop below the minimum number of messages for a bundle
741 */
742 static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint,
743 struct list_head *queue,
744 int *sent_bundle, int *n_bundle_pkts)
745 {
746 struct htc_target *target = endpoint->target;
747 struct hif_scatter_req *scat_req = NULL;
748 int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0;
749 int status;
750 u32 txb_mask;
751 u8 ac = WMM_NUM_AC;
752
753 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) ||
754 (WMI_CONTROL_SVC != endpoint->svc_id))
755 ac = target->dev->ar->ep2ac_map[endpoint->eid];
756
757 while (true) {
758 status = 0;
759 n_scat = get_queue_depth(queue);
760 n_scat = min(n_scat, target->msg_per_bndl_max);
761
762 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE)
763 /* not enough to bundle */
764 break;
765
766 scat_req = hif_scatter_req_get(target->dev->ar);
767
768 if (!scat_req) {
769 /* no scatter resources */
770 ath6kl_dbg(ATH6KL_DBG_HTC,
771 "htc tx no more scatter resources\n");
772 break;
773 }
774
775 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) {
776 if (WMM_AC_BE == ac)
777 /*
778 * BE, BK have priorities and bit
779 * positions reversed
780 */
781 txb_mask = (1 << WMM_AC_BK);
782 else
783 /*
784 * any AC with priority lower than
785 * itself
786 */
787 txb_mask = ((1 << ac) - 1);
788 /*
789 * when the scatter request resources drop below a
790 * certain threshold, disable Tx bundling for all
791 * AC's with priority lower than the current requesting
792 * AC. Otherwise re-enable Tx bundling for them
793 */
794 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS)
795 target->tx_bndl_mask &= ~txb_mask;
796 else
797 target->tx_bndl_mask |= txb_mask;
798 }
799
800 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n",
801 n_scat);
802
803 scat_req->len = 0;
804 scat_req->scat_entries = 0;
805
806 status = ath6kl_htc_tx_setup_scat_list(target, endpoint,
807 scat_req, n_scat,
808 queue);
809 if (status == -EAGAIN) {
810 hif_scatter_req_add(target->dev->ar, scat_req);
811 break;
812 }
813
814 /* send path is always asynchronous */
815 scat_req->complete = htc_async_tx_scat_complete;
816 n_sent_bundle++;
817 tot_pkts_bundle += scat_req->scat_entries;
818
819 ath6kl_dbg(ATH6KL_DBG_HTC,
820 "htc tx scatter bytes %d entries %d\n",
821 scat_req->len, scat_req->scat_entries);
822 ath6kl_hif_submit_scat_req(target->dev, scat_req, false);
823
824 if (status)
825 break;
826 }
827
828 *sent_bundle = n_sent_bundle;
829 *n_bundle_pkts = tot_pkts_bundle;
830 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n",
831 n_sent_bundle);
832
833 return;
834 }
835
836 static void ath6kl_htc_tx_from_queue(struct htc_target *target,
837 struct htc_endpoint *endpoint)
838 {
839 struct list_head txq;
840 struct htc_packet *packet;
841 int bundle_sent;
842 int n_pkts_bundle;
843 u8 ac = WMM_NUM_AC;
844
845 spin_lock_bh(&target->tx_lock);
846
847 endpoint->tx_proc_cnt++;
848 if (endpoint->tx_proc_cnt > 1) {
849 endpoint->tx_proc_cnt--;
850 spin_unlock_bh(&target->tx_lock);
851 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n");
852 return;
853 }
854
855 /*
856 * drain the endpoint TX queue for transmission as long
857 * as we have enough credits.
858 */
859 INIT_LIST_HEAD(&txq);
860
861 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) ||
862 (WMI_CONTROL_SVC != endpoint->svc_id))
863 ac = target->dev->ar->ep2ac_map[endpoint->eid];
864
865 while (true) {
866
867 if (list_empty(&endpoint->txq))
868 break;
869
870 ath6kl_htc_tx_pkts_get(target, endpoint, &txq);
871
872 if (list_empty(&txq))
873 break;
874
875 spin_unlock_bh(&target->tx_lock);
876
877 bundle_sent = 0;
878 n_pkts_bundle = 0;
879
880 while (true) {
881 /* try to send a bundle on each pass */
882 if ((target->tx_bndl_mask) &&
883 (get_queue_depth(&txq) >=
884 HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
885 int temp1 = 0, temp2 = 0;
886
887 /* check if bundling is enabled for an AC */
888 if (target->tx_bndl_mask & (1 << ac)) {
889 ath6kl_htc_tx_bundle(endpoint, &txq,
890 &temp1, &temp2);
891 bundle_sent += temp1;
892 n_pkts_bundle += temp2;
893 }
894 }
895
896 if (list_empty(&txq))
897 break;
898
899 packet = list_first_entry(&txq, struct htc_packet,
900 list);
901 list_del(&packet->list);
902
903 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags,
904 0, packet->info.tx.seqno);
905 ath6kl_htc_tx_issue(target, packet);
906 }
907
908 spin_lock_bh(&target->tx_lock);
909
910 endpoint->ep_st.tx_bundles += bundle_sent;
911 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle;
912
913 /*
914 * if an AC has bundling disabled and no tx bundling
915 * has occured continously for a certain number of TX,
916 * enable tx bundling for this AC
917 */
918 if (!bundle_sent) {
919 if (!(target->tx_bndl_mask & (1 << ac)) &&
920 (ac < WMM_NUM_AC)) {
921 if (++target->ac_tx_count[ac] >=
922 TX_RESUME_BUNDLE_THRESHOLD) {
923 target->ac_tx_count[ac] = 0;
924 target->tx_bndl_mask |= (1 << ac);
925 }
926 }
927 } else {
928 /* tx bundling will reset the counter */
929 if (ac < WMM_NUM_AC)
930 target->ac_tx_count[ac] = 0;
931 }
932 }
933
934 endpoint->tx_proc_cnt = 0;
935 spin_unlock_bh(&target->tx_lock);
936 }
937
938 static bool ath6kl_htc_tx_try(struct htc_target *target,
939 struct htc_endpoint *endpoint,
940 struct htc_packet *tx_pkt)
941 {
942 struct htc_ep_callbacks ep_cb;
943 int txq_depth;
944 bool overflow = false;
945
946 ep_cb = endpoint->ep_cb;
947
948 spin_lock_bh(&target->tx_lock);
949 txq_depth = get_queue_depth(&endpoint->txq);
950 spin_unlock_bh(&target->tx_lock);
951
952 if (txq_depth >= endpoint->max_txq_depth)
953 overflow = true;
954
955 if (overflow)
956 ath6kl_dbg(ATH6KL_DBG_HTC,
957 "htc tx overflow ep %d depth %d max %d\n",
958 endpoint->eid, txq_depth,
959 endpoint->max_txq_depth);
960
961 if (overflow && ep_cb.tx_full) {
962 if (ep_cb.tx_full(endpoint->target, tx_pkt) ==
963 HTC_SEND_FULL_DROP) {
964 endpoint->ep_st.tx_dropped += 1;
965 return false;
966 }
967 }
968
969 spin_lock_bh(&target->tx_lock);
970 list_add_tail(&tx_pkt->list, &endpoint->txq);
971 spin_unlock_bh(&target->tx_lock);
972
973 ath6kl_htc_tx_from_queue(target, endpoint);
974
975 return true;
976 }
977
978 static void htc_chk_ep_txq(struct htc_target *target)
979 {
980 struct htc_endpoint *endpoint;
981 struct htc_endpoint_credit_dist *cred_dist;
982
983 /*
984 * Run through the credit distribution list to see if there are
985 * packets queued. NOTE: no locks need to be taken since the
986 * distribution list is not dynamic (cannot be re-ordered) and we
987 * are not modifying any state.
988 */
989 list_for_each_entry(cred_dist, &target->cred_dist_list, list) {
990 endpoint = cred_dist->htc_ep;
991
992 spin_lock_bh(&target->tx_lock);
993 if (!list_empty(&endpoint->txq)) {
994 ath6kl_dbg(ATH6KL_DBG_HTC,
995 "htc creds ep %d credits %d pkts %d\n",
996 cred_dist->endpoint,
997 endpoint->cred_dist.credits,
998 get_queue_depth(&endpoint->txq));
999 spin_unlock_bh(&target->tx_lock);
1000 /*
1001 * Try to start the stalled queue, this list is
1002 * ordered by priority. If there are credits
1003 * available the highest priority queue will get a
1004 * chance to reclaim credits from lower priority
1005 * ones.
1006 */
1007 ath6kl_htc_tx_from_queue(target, endpoint);
1008 spin_lock_bh(&target->tx_lock);
1009 }
1010 spin_unlock_bh(&target->tx_lock);
1011 }
1012 }
1013
1014 static int htc_setup_tx_complete(struct htc_target *target)
1015 {
1016 struct htc_packet *send_pkt = NULL;
1017 int status;
1018
1019 send_pkt = htc_get_control_buf(target, true);
1020
1021 if (!send_pkt)
1022 return -ENOMEM;
1023
1024 if (target->htc_tgt_ver >= HTC_VERSION_2P1) {
1025 struct htc_setup_comp_ext_msg *setup_comp_ext;
1026 u32 flags = 0;
1027
1028 setup_comp_ext =
1029 (struct htc_setup_comp_ext_msg *)send_pkt->buf;
1030 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext));
1031 setup_comp_ext->msg_id =
1032 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID);
1033
1034 if (target->msg_per_bndl_max > 0) {
1035 /* Indicate HTC bundling to the target */
1036 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN;
1037 setup_comp_ext->msg_per_rxbndl =
1038 target->msg_per_bndl_max;
1039 }
1040
1041 memcpy(&setup_comp_ext->flags, &flags,
1042 sizeof(setup_comp_ext->flags));
1043 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext,
1044 sizeof(struct htc_setup_comp_ext_msg),
1045 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1046
1047 } else {
1048 struct htc_setup_comp_msg *setup_comp;
1049 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf;
1050 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg));
1051 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID);
1052 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp,
1053 sizeof(struct htc_setup_comp_msg),
1054 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1055 }
1056
1057 /* we want synchronous operation */
1058 send_pkt->completion = NULL;
1059 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0);
1060 status = ath6kl_htc_tx_issue(target, send_pkt);
1061
1062 if (send_pkt != NULL)
1063 htc_reclaim_txctrl_buf(target, send_pkt);
1064
1065 return status;
1066 }
1067
1068 void ath6kl_htc_set_credit_dist(struct htc_target *target,
1069 struct ath6kl_htc_credit_info *credit_info,
1070 u16 srvc_pri_order[], int list_len)
1071 {
1072 struct htc_endpoint *endpoint;
1073 int i, ep;
1074
1075 target->credit_info = credit_info;
1076
1077 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list,
1078 &target->cred_dist_list);
1079
1080 for (i = 0; i < list_len; i++) {
1081 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) {
1082 endpoint = &target->endpoint[ep];
1083 if (endpoint->svc_id == srvc_pri_order[i]) {
1084 list_add_tail(&endpoint->cred_dist.list,
1085 &target->cred_dist_list);
1086 break;
1087 }
1088 }
1089 if (ep >= ENDPOINT_MAX) {
1090 WARN_ON(1);
1091 return;
1092 }
1093 }
1094 }
1095
1096 int ath6kl_htc_tx(struct htc_target *target, struct htc_packet *packet)
1097 {
1098 struct htc_endpoint *endpoint;
1099 struct list_head queue;
1100
1101 ath6kl_dbg(ATH6KL_DBG_HTC,
1102 "htc tx ep id %d buf 0x%p len %d\n",
1103 packet->endpoint, packet->buf, packet->act_len);
1104
1105 if (packet->endpoint >= ENDPOINT_MAX) {
1106 WARN_ON(1);
1107 return -EINVAL;
1108 }
1109
1110 endpoint = &target->endpoint[packet->endpoint];
1111
1112 if (!ath6kl_htc_tx_try(target, endpoint, packet)) {
1113 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ?
1114 -ECANCELED : -ENOSPC;
1115 INIT_LIST_HEAD(&queue);
1116 list_add(&packet->list, &queue);
1117 htc_tx_complete(endpoint, &queue);
1118 }
1119
1120 return 0;
1121 }
1122
1123 /* flush endpoint TX queue */
1124 void ath6kl_htc_flush_txep(struct htc_target *target,
1125 enum htc_endpoint_id eid, u16 tag)
1126 {
1127 struct htc_packet *packet, *tmp_pkt;
1128 struct list_head discard_q, container;
1129 struct htc_endpoint *endpoint = &target->endpoint[eid];
1130
1131 if (!endpoint->svc_id) {
1132 WARN_ON(1);
1133 return;
1134 }
1135
1136 /* initialize the discard queue */
1137 INIT_LIST_HEAD(&discard_q);
1138
1139 spin_lock_bh(&target->tx_lock);
1140
1141 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) {
1142 if ((tag == HTC_TX_PACKET_TAG_ALL) ||
1143 (tag == packet->info.tx.tag))
1144 list_move_tail(&packet->list, &discard_q);
1145 }
1146
1147 spin_unlock_bh(&target->tx_lock);
1148
1149 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) {
1150 packet->status = -ECANCELED;
1151 list_del(&packet->list);
1152 ath6kl_dbg(ATH6KL_DBG_HTC,
1153 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n",
1154 packet, packet->act_len,
1155 packet->endpoint, packet->info.tx.tag);
1156
1157 INIT_LIST_HEAD(&container);
1158 list_add_tail(&packet->list, &container);
1159 htc_tx_complete(endpoint, &container);
1160 }
1161
1162 }
1163
1164 static void ath6kl_htc_flush_txep_all(struct htc_target *target)
1165 {
1166 struct htc_endpoint *endpoint;
1167 int i;
1168
1169 dump_cred_dist_stats(target);
1170
1171 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
1172 endpoint = &target->endpoint[i];
1173 if (endpoint->svc_id == 0)
1174 /* not in use.. */
1175 continue;
1176 ath6kl_htc_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL);
1177 }
1178 }
1179
1180 void ath6kl_htc_indicate_activity_change(struct htc_target *target,
1181 enum htc_endpoint_id eid, bool active)
1182 {
1183 struct htc_endpoint *endpoint = &target->endpoint[eid];
1184 bool dist = false;
1185
1186 if (endpoint->svc_id == 0) {
1187 WARN_ON(1);
1188 return;
1189 }
1190
1191 spin_lock_bh(&target->tx_lock);
1192
1193 if (active) {
1194 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) {
1195 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE;
1196 dist = true;
1197 }
1198 } else {
1199 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) {
1200 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE;
1201 dist = true;
1202 }
1203 }
1204
1205 if (dist) {
1206 endpoint->cred_dist.txq_depth =
1207 get_queue_depth(&endpoint->txq);
1208
1209 ath6kl_dbg(ATH6KL_DBG_HTC,
1210 "htc tx activity ctxt 0x%p dist 0x%p\n",
1211 target->credit_info, &target->cred_dist_list);
1212
1213 ath6kl_credit_distribute(target->credit_info,
1214 &target->cred_dist_list,
1215 HTC_CREDIT_DIST_ACTIVITY_CHANGE);
1216 }
1217
1218 spin_unlock_bh(&target->tx_lock);
1219
1220 if (dist && !active)
1221 htc_chk_ep_txq(target);
1222 }
1223
1224 /* HTC Rx */
1225
1226 static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint,
1227 int n_look_ahds)
1228 {
1229 endpoint->ep_st.rx_pkts++;
1230 if (n_look_ahds == 1)
1231 endpoint->ep_st.rx_lkahds++;
1232 else if (n_look_ahds > 1)
1233 endpoint->ep_st.rx_bundle_lkahd++;
1234 }
1235
1236 static inline bool htc_valid_rx_frame_len(struct htc_target *target,
1237 enum htc_endpoint_id eid, int len)
1238 {
1239 return (eid == target->dev->ar->ctrl_ep) ?
1240 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE;
1241 }
1242
1243 static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet)
1244 {
1245 struct list_head queue;
1246
1247 INIT_LIST_HEAD(&queue);
1248 list_add_tail(&packet->list, &queue);
1249 return ath6kl_htc_add_rxbuf_multiple(target, &queue);
1250 }
1251
1252 static void htc_reclaim_rxbuf(struct htc_target *target,
1253 struct htc_packet *packet,
1254 struct htc_endpoint *ep)
1255 {
1256 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) {
1257 htc_rxpkt_reset(packet);
1258 packet->status = -ECANCELED;
1259 ep->ep_cb.rx(ep->target, packet);
1260 } else {
1261 htc_rxpkt_reset(packet);
1262 htc_add_rxbuf((void *)(target), packet);
1263 }
1264 }
1265
1266 static void reclaim_rx_ctrl_buf(struct htc_target *target,
1267 struct htc_packet *packet)
1268 {
1269 spin_lock_bh(&target->htc_lock);
1270 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
1271 spin_unlock_bh(&target->htc_lock);
1272 }
1273
1274 static int ath6kl_htc_rx_packet(struct htc_target *target,
1275 struct htc_packet *packet,
1276 u32 rx_len)
1277 {
1278 struct ath6kl_device *dev = target->dev;
1279 u32 padded_len;
1280 int status;
1281
1282 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len);
1283
1284 if (padded_len > packet->buf_len) {
1285 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n",
1286 padded_len, rx_len, packet->buf_len);
1287 return -ENOMEM;
1288 }
1289
1290 ath6kl_dbg(ATH6KL_DBG_HTC,
1291 "htc rx 0x%p hdr x%x len %d mbox 0x%x\n",
1292 packet, packet->info.rx.exp_hdr,
1293 padded_len, dev->ar->mbox_info.htc_addr);
1294
1295 status = hif_read_write_sync(dev->ar,
1296 dev->ar->mbox_info.htc_addr,
1297 packet->buf, padded_len,
1298 HIF_RD_SYNC_BLOCK_FIX);
1299
1300 packet->status = status;
1301
1302 return status;
1303 }
1304
1305 /*
1306 * optimization for recv packets, we can indicate a
1307 * "hint" that there are more single-packets to fetch
1308 * on this endpoint.
1309 */
1310 static void ath6kl_htc_rx_set_indicate(u32 lk_ahd,
1311 struct htc_endpoint *endpoint,
1312 struct htc_packet *packet)
1313 {
1314 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd;
1315
1316 if (htc_hdr->eid == packet->endpoint) {
1317 if (!list_empty(&endpoint->rx_bufq))
1318 packet->info.rx.indicat_flags |=
1319 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
1320 }
1321 }
1322
1323 static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint)
1324 {
1325 struct htc_ep_callbacks ep_cb = endpoint->ep_cb;
1326
1327 if (ep_cb.rx_refill_thresh > 0) {
1328 spin_lock_bh(&endpoint->target->rx_lock);
1329 if (get_queue_depth(&endpoint->rx_bufq)
1330 < ep_cb.rx_refill_thresh) {
1331 spin_unlock_bh(&endpoint->target->rx_lock);
1332 ep_cb.rx_refill(endpoint->target, endpoint->eid);
1333 return;
1334 }
1335 spin_unlock_bh(&endpoint->target->rx_lock);
1336 }
1337 }
1338
1339 /* This function is called with rx_lock held */
1340 static int ath6kl_htc_rx_setup(struct htc_target *target,
1341 struct htc_endpoint *ep,
1342 u32 *lk_ahds, struct list_head *queue, int n_msg)
1343 {
1344 struct htc_packet *packet;
1345 /* FIXME: type of lk_ahds can't be right */
1346 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds;
1347 struct htc_ep_callbacks ep_cb;
1348 int status = 0, j, full_len;
1349 bool no_recycle;
1350
1351 full_len = CALC_TXRX_PADDED_LEN(target,
1352 le16_to_cpu(htc_hdr->payld_len) +
1353 sizeof(*htc_hdr));
1354
1355 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) {
1356 ath6kl_warn("Rx buffer requested with invalid length\n");
1357 return -EINVAL;
1358 }
1359
1360 ep_cb = ep->ep_cb;
1361 for (j = 0; j < n_msg; j++) {
1362
1363 /*
1364 * Reset flag, any packets allocated using the
1365 * rx_alloc() API cannot be recycled on
1366 * cleanup,they must be explicitly returned.
1367 */
1368 no_recycle = false;
1369
1370 if (ep_cb.rx_allocthresh &&
1371 (full_len > ep_cb.rx_alloc_thresh)) {
1372 ep->ep_st.rx_alloc_thresh_hit += 1;
1373 ep->ep_st.rxalloc_thresh_byte +=
1374 le16_to_cpu(htc_hdr->payld_len);
1375
1376 spin_unlock_bh(&target->rx_lock);
1377 no_recycle = true;
1378
1379 packet = ep_cb.rx_allocthresh(ep->target, ep->eid,
1380 full_len);
1381 spin_lock_bh(&target->rx_lock);
1382 } else {
1383 /* refill handler is being used */
1384 if (list_empty(&ep->rx_bufq)) {
1385 if (ep_cb.rx_refill) {
1386 spin_unlock_bh(&target->rx_lock);
1387 ep_cb.rx_refill(ep->target, ep->eid);
1388 spin_lock_bh(&target->rx_lock);
1389 }
1390 }
1391
1392 if (list_empty(&ep->rx_bufq))
1393 packet = NULL;
1394 else {
1395 packet = list_first_entry(&ep->rx_bufq,
1396 struct htc_packet, list);
1397 list_del(&packet->list);
1398 }
1399 }
1400
1401 if (!packet) {
1402 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS;
1403 target->ep_waiting = ep->eid;
1404 return -ENOSPC;
1405 }
1406
1407 /* clear flags */
1408 packet->info.rx.rx_flags = 0;
1409 packet->info.rx.indicat_flags = 0;
1410 packet->status = 0;
1411
1412 if (no_recycle)
1413 /*
1414 * flag that these packets cannot be
1415 * recycled, they have to be returned to
1416 * the user
1417 */
1418 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE;
1419
1420 /* Caller needs to free this upon any failure */
1421 list_add_tail(&packet->list, queue);
1422
1423 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
1424 status = -ECANCELED;
1425 break;
1426 }
1427
1428 if (j) {
1429 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR;
1430 packet->info.rx.exp_hdr = 0xFFFFFFFF;
1431 } else
1432 /* set expected look ahead */
1433 packet->info.rx.exp_hdr = *lk_ahds;
1434
1435 packet->act_len = le16_to_cpu(htc_hdr->payld_len) +
1436 HTC_HDR_LENGTH;
1437 }
1438
1439 return status;
1440 }
1441
1442 static int ath6kl_htc_rx_alloc(struct htc_target *target,
1443 u32 lk_ahds[], int msg,
1444 struct htc_endpoint *endpoint,
1445 struct list_head *queue)
1446 {
1447 int status = 0;
1448 struct htc_packet *packet, *tmp_pkt;
1449 struct htc_frame_hdr *htc_hdr;
1450 int i, n_msg;
1451
1452 spin_lock_bh(&target->rx_lock);
1453
1454 for (i = 0; i < msg; i++) {
1455
1456 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i];
1457
1458 if (htc_hdr->eid >= ENDPOINT_MAX) {
1459 ath6kl_err("invalid ep in look-ahead: %d\n",
1460 htc_hdr->eid);
1461 status = -ENOMEM;
1462 break;
1463 }
1464
1465 if (htc_hdr->eid != endpoint->eid) {
1466 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n",
1467 htc_hdr->eid, endpoint->eid, i);
1468 status = -ENOMEM;
1469 break;
1470 }
1471
1472 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) {
1473 ath6kl_err("payload len %d exceeds max htc : %d !\n",
1474 htc_hdr->payld_len,
1475 (u32) HTC_MAX_PAYLOAD_LENGTH);
1476 status = -ENOMEM;
1477 break;
1478 }
1479
1480 if (endpoint->svc_id == 0) {
1481 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid);
1482 status = -ENOMEM;
1483 break;
1484 }
1485
1486 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) {
1487 /*
1488 * HTC header indicates that every packet to follow
1489 * has the same padded length so that it can be
1490 * optimally fetched as a full bundle.
1491 */
1492 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >>
1493 HTC_FLG_RX_BNDL_CNT_S;
1494
1495 /* the count doesn't include the starter frame */
1496 n_msg++;
1497 if (n_msg > target->msg_per_bndl_max) {
1498 status = -ENOMEM;
1499 break;
1500 }
1501
1502 endpoint->ep_st.rx_bundle_from_hdr += 1;
1503 ath6kl_dbg(ATH6KL_DBG_HTC,
1504 "htc rx bundle pkts %d\n",
1505 n_msg);
1506 } else
1507 /* HTC header only indicates 1 message to fetch */
1508 n_msg = 1;
1509
1510 /* Setup packet buffers for each message */
1511 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i],
1512 queue, n_msg);
1513
1514 /*
1515 * This is due to unavailabilty of buffers to rx entire data.
1516 * Return no error so that free buffers from queue can be used
1517 * to receive partial data.
1518 */
1519 if (status == -ENOSPC) {
1520 spin_unlock_bh(&target->rx_lock);
1521 return 0;
1522 }
1523
1524 if (status)
1525 break;
1526 }
1527
1528 spin_unlock_bh(&target->rx_lock);
1529
1530 if (status) {
1531 list_for_each_entry_safe(packet, tmp_pkt, queue, list) {
1532 list_del(&packet->list);
1533 htc_reclaim_rxbuf(target, packet,
1534 &target->endpoint[packet->endpoint]);
1535 }
1536 }
1537
1538 return status;
1539 }
1540
1541 static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets)
1542 {
1543 if (packets->endpoint != ENDPOINT_0) {
1544 WARN_ON(1);
1545 return;
1546 }
1547
1548 if (packets->status == -ECANCELED) {
1549 reclaim_rx_ctrl_buf(context, packets);
1550 return;
1551 }
1552
1553 if (packets->act_len > 0) {
1554 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n",
1555 packets->act_len + HTC_HDR_LENGTH);
1556
1557 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1558 "htc rx unexpected endpoint 0 message", "",
1559 packets->buf - HTC_HDR_LENGTH,
1560 packets->act_len + HTC_HDR_LENGTH);
1561 }
1562
1563 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]);
1564 }
1565
1566 static void htc_proc_cred_rpt(struct htc_target *target,
1567 struct htc_credit_report *rpt,
1568 int n_entries,
1569 enum htc_endpoint_id from_ep)
1570 {
1571 struct htc_endpoint *endpoint;
1572 int tot_credits = 0, i;
1573 bool dist = false;
1574
1575 spin_lock_bh(&target->tx_lock);
1576
1577 for (i = 0; i < n_entries; i++, rpt++) {
1578 if (rpt->eid >= ENDPOINT_MAX) {
1579 WARN_ON(1);
1580 spin_unlock_bh(&target->tx_lock);
1581 return;
1582 }
1583
1584 endpoint = &target->endpoint[rpt->eid];
1585
1586 ath6kl_dbg(ATH6KL_DBG_CREDIT,
1587 "credit report ep %d credits %d\n",
1588 rpt->eid, rpt->credits);
1589
1590 endpoint->ep_st.tx_cred_rpt += 1;
1591 endpoint->ep_st.cred_retnd += rpt->credits;
1592
1593 if (from_ep == rpt->eid) {
1594 /*
1595 * This credit report arrived on the same endpoint
1596 * indicating it arrived in an RX packet.
1597 */
1598 endpoint->ep_st.cred_from_rx += rpt->credits;
1599 endpoint->ep_st.cred_rpt_from_rx += 1;
1600 } else if (from_ep == ENDPOINT_0) {
1601 /* credit arrived on endpoint 0 as a NULL message */
1602 endpoint->ep_st.cred_from_ep0 += rpt->credits;
1603 endpoint->ep_st.cred_rpt_ep0 += 1;
1604 } else {
1605 endpoint->ep_st.cred_from_other += rpt->credits;
1606 endpoint->ep_st.cred_rpt_from_other += 1;
1607 }
1608
1609 if (rpt->eid == ENDPOINT_0)
1610 /* always give endpoint 0 credits back */
1611 endpoint->cred_dist.credits += rpt->credits;
1612 else {
1613 endpoint->cred_dist.cred_to_dist += rpt->credits;
1614 dist = true;
1615 }
1616
1617 /*
1618 * Refresh tx depth for distribution function that will
1619 * recover these credits NOTE: this is only valid when
1620 * there are credits to recover!
1621 */
1622 endpoint->cred_dist.txq_depth =
1623 get_queue_depth(&endpoint->txq);
1624
1625 tot_credits += rpt->credits;
1626 }
1627
1628 if (dist) {
1629 /*
1630 * This was a credit return based on a completed send
1631 * operations note, this is done with the lock held
1632 */
1633 ath6kl_credit_distribute(target->credit_info,
1634 &target->cred_dist_list,
1635 HTC_CREDIT_DIST_SEND_COMPLETE);
1636 }
1637
1638 spin_unlock_bh(&target->tx_lock);
1639
1640 if (tot_credits)
1641 htc_chk_ep_txq(target);
1642 }
1643
1644 static int htc_parse_trailer(struct htc_target *target,
1645 struct htc_record_hdr *record,
1646 u8 *record_buf, u32 *next_lk_ahds,
1647 enum htc_endpoint_id endpoint,
1648 int *n_lk_ahds)
1649 {
1650 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt;
1651 struct htc_lookahead_report *lk_ahd;
1652 int len;
1653
1654 switch (record->rec_id) {
1655 case HTC_RECORD_CREDITS:
1656 len = record->len / sizeof(struct htc_credit_report);
1657 if (!len) {
1658 WARN_ON(1);
1659 return -EINVAL;
1660 }
1661
1662 htc_proc_cred_rpt(target,
1663 (struct htc_credit_report *) record_buf,
1664 len, endpoint);
1665 break;
1666 case HTC_RECORD_LOOKAHEAD:
1667 len = record->len / sizeof(*lk_ahd);
1668 if (!len) {
1669 WARN_ON(1);
1670 return -EINVAL;
1671 }
1672
1673 lk_ahd = (struct htc_lookahead_report *) record_buf;
1674 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) &&
1675 next_lk_ahds) {
1676
1677 ath6kl_dbg(ATH6KL_DBG_HTC,
1678 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n",
1679 lk_ahd->pre_valid, lk_ahd->post_valid);
1680
1681 /* look ahead bytes are valid, copy them over */
1682 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4);
1683
1684 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1685 "htc rx next look ahead",
1686 "", next_lk_ahds, 4);
1687
1688 *n_lk_ahds = 1;
1689 }
1690 break;
1691 case HTC_RECORD_LOOKAHEAD_BUNDLE:
1692 len = record->len / sizeof(*bundle_lkahd_rpt);
1693 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) {
1694 WARN_ON(1);
1695 return -EINVAL;
1696 }
1697
1698 if (next_lk_ahds) {
1699 int i;
1700
1701 bundle_lkahd_rpt =
1702 (struct htc_bundle_lkahd_rpt *) record_buf;
1703
1704 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd",
1705 "", record_buf, record->len);
1706
1707 for (i = 0; i < len; i++) {
1708 memcpy((u8 *)&next_lk_ahds[i],
1709 bundle_lkahd_rpt->lk_ahd, 4);
1710 bundle_lkahd_rpt++;
1711 }
1712
1713 *n_lk_ahds = i;
1714 }
1715 break;
1716 default:
1717 ath6kl_err("unhandled record: id:%d len:%d\n",
1718 record->rec_id, record->len);
1719 break;
1720 }
1721
1722 return 0;
1723
1724 }
1725
1726 static int htc_proc_trailer(struct htc_target *target,
1727 u8 *buf, int len, u32 *next_lk_ahds,
1728 int *n_lk_ahds, enum htc_endpoint_id endpoint)
1729 {
1730 struct htc_record_hdr *record;
1731 int orig_len;
1732 int status;
1733 u8 *record_buf;
1734 u8 *orig_buf;
1735
1736 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len);
1737 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len);
1738
1739 orig_buf = buf;
1740 orig_len = len;
1741 status = 0;
1742
1743 while (len > 0) {
1744
1745 if (len < sizeof(struct htc_record_hdr)) {
1746 status = -ENOMEM;
1747 break;
1748 }
1749 /* these are byte aligned structs */
1750 record = (struct htc_record_hdr *) buf;
1751 len -= sizeof(struct htc_record_hdr);
1752 buf += sizeof(struct htc_record_hdr);
1753
1754 if (record->len > len) {
1755 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n",
1756 record->len, record->rec_id, len);
1757 status = -ENOMEM;
1758 break;
1759 }
1760 record_buf = buf;
1761
1762 status = htc_parse_trailer(target, record, record_buf,
1763 next_lk_ahds, endpoint, n_lk_ahds);
1764
1765 if (status)
1766 break;
1767
1768 /* advance buffer past this record for next time around */
1769 buf += record->len;
1770 len -= record->len;
1771 }
1772
1773 if (status)
1774 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer",
1775 "", orig_buf, orig_len);
1776
1777 return status;
1778 }
1779
1780 static int ath6kl_htc_rx_process_hdr(struct htc_target *target,
1781 struct htc_packet *packet,
1782 u32 *next_lkahds, int *n_lkahds)
1783 {
1784 int status = 0;
1785 u16 payload_len;
1786 u32 lk_ahd;
1787 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf;
1788
1789 if (n_lkahds != NULL)
1790 *n_lkahds = 0;
1791
1792 /*
1793 * NOTE: we cannot assume the alignment of buf, so we use the safe
1794 * macros to retrieve 16 bit fields.
1795 */
1796 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len));
1797
1798 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd));
1799
1800 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) {
1801 /*
1802 * Refresh the expected header and the actual length as it
1803 * was unknown when this packet was grabbed as part of the
1804 * bundle.
1805 */
1806 packet->info.rx.exp_hdr = lk_ahd;
1807 packet->act_len = payload_len + HTC_HDR_LENGTH;
1808
1809 /* validate the actual header that was refreshed */
1810 if (packet->act_len > packet->buf_len) {
1811 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n",
1812 payload_len, lk_ahd);
1813 /*
1814 * Limit this to max buffer just to print out some
1815 * of the buffer.
1816 */
1817 packet->act_len = min(packet->act_len, packet->buf_len);
1818 status = -ENOMEM;
1819 goto fail_rx;
1820 }
1821
1822 if (packet->endpoint != htc_hdr->eid) {
1823 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n",
1824 htc_hdr->eid, packet->endpoint);
1825 status = -ENOMEM;
1826 goto fail_rx;
1827 }
1828 }
1829
1830 if (lk_ahd != packet->info.rx.exp_hdr) {
1831 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n",
1832 __func__, packet, packet->info.rx.rx_flags);
1833 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd",
1834 "", &packet->info.rx.exp_hdr, 4);
1835 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header",
1836 "", (u8 *)&lk_ahd, sizeof(lk_ahd));
1837 status = -ENOMEM;
1838 goto fail_rx;
1839 }
1840
1841 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) {
1842 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) ||
1843 htc_hdr->ctrl[0] > payload_len) {
1844 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n",
1845 __func__, payload_len, htc_hdr->ctrl[0]);
1846 status = -ENOMEM;
1847 goto fail_rx;
1848 }
1849
1850 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) {
1851 next_lkahds = NULL;
1852 n_lkahds = NULL;
1853 }
1854
1855 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH
1856 + payload_len - htc_hdr->ctrl[0],
1857 htc_hdr->ctrl[0], next_lkahds,
1858 n_lkahds, packet->endpoint);
1859
1860 if (status)
1861 goto fail_rx;
1862
1863 packet->act_len -= htc_hdr->ctrl[0];
1864 }
1865
1866 packet->buf += HTC_HDR_LENGTH;
1867 packet->act_len -= HTC_HDR_LENGTH;
1868
1869 fail_rx:
1870 if (status)
1871 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet",
1872 "", packet->buf, packet->act_len);
1873
1874 return status;
1875 }
1876
1877 static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint,
1878 struct htc_packet *packet)
1879 {
1880 ath6kl_dbg(ATH6KL_DBG_HTC,
1881 "htc rx complete ep %d packet 0x%p\n",
1882 endpoint->eid, packet);
1883 endpoint->ep_cb.rx(endpoint->target, packet);
1884 }
1885
1886 static int ath6kl_htc_rx_bundle(struct htc_target *target,
1887 struct list_head *rxq,
1888 struct list_head *sync_compq,
1889 int *n_pkt_fetched, bool part_bundle)
1890 {
1891 struct hif_scatter_req *scat_req;
1892 struct htc_packet *packet;
1893 int rem_space = target->max_rx_bndl_sz;
1894 int n_scat_pkt, status = 0, i, len;
1895
1896 n_scat_pkt = get_queue_depth(rxq);
1897 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max);
1898
1899 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) {
1900 /*
1901 * We were forced to split this bundle receive operation
1902 * all packets in this partial bundle must have their
1903 * lookaheads ignored.
1904 */
1905 part_bundle = true;
1906
1907 /*
1908 * This would only happen if the target ignored our max
1909 * bundle limit.
1910 */
1911 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n",
1912 __func__, get_queue_depth(rxq), n_scat_pkt);
1913 }
1914
1915 len = 0;
1916
1917 ath6kl_dbg(ATH6KL_DBG_HTC,
1918 "htc rx bundle depth %d pkts %d\n",
1919 get_queue_depth(rxq), n_scat_pkt);
1920
1921 scat_req = hif_scatter_req_get(target->dev->ar);
1922
1923 if (scat_req == NULL)
1924 goto fail_rx_pkt;
1925
1926 for (i = 0; i < n_scat_pkt; i++) {
1927 int pad_len;
1928
1929 packet = list_first_entry(rxq, struct htc_packet, list);
1930 list_del(&packet->list);
1931
1932 pad_len = CALC_TXRX_PADDED_LEN(target,
1933 packet->act_len);
1934
1935 if ((rem_space - pad_len) < 0) {
1936 list_add(&packet->list, rxq);
1937 break;
1938 }
1939
1940 rem_space -= pad_len;
1941
1942 if (part_bundle || (i < (n_scat_pkt - 1)))
1943 /*
1944 * Packet 0..n-1 cannot be checked for look-aheads
1945 * since we are fetching a bundle the last packet
1946 * however can have it's lookahead used
1947 */
1948 packet->info.rx.rx_flags |=
1949 HTC_RX_PKT_IGNORE_LOOKAHEAD;
1950
1951 /* NOTE: 1 HTC packet per scatter entry */
1952 scat_req->scat_list[i].buf = packet->buf;
1953 scat_req->scat_list[i].len = pad_len;
1954
1955 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE;
1956
1957 list_add_tail(&packet->list, sync_compq);
1958
1959 WARN_ON(!scat_req->scat_list[i].len);
1960 len += scat_req->scat_list[i].len;
1961 }
1962
1963 scat_req->len = len;
1964 scat_req->scat_entries = i;
1965
1966 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true);
1967
1968 if (!status)
1969 *n_pkt_fetched = i;
1970
1971 /* free scatter request */
1972 hif_scatter_req_add(target->dev->ar, scat_req);
1973
1974 fail_rx_pkt:
1975
1976 return status;
1977 }
1978
1979 static int ath6kl_htc_rx_process_packets(struct htc_target *target,
1980 struct list_head *comp_pktq,
1981 u32 lk_ahds[],
1982 int *n_lk_ahd)
1983 {
1984 struct htc_packet *packet, *tmp_pkt;
1985 struct htc_endpoint *ep;
1986 int status = 0;
1987
1988 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) {
1989 ep = &target->endpoint[packet->endpoint];
1990
1991 /* process header for each of the recv packet */
1992 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds,
1993 n_lk_ahd);
1994 if (status)
1995 return status;
1996
1997 list_del(&packet->list);
1998
1999 if (list_empty(comp_pktq)) {
2000 /*
2001 * Last packet's more packet flag is set
2002 * based on the lookahead.
2003 */
2004 if (*n_lk_ahd > 0)
2005 ath6kl_htc_rx_set_indicate(lk_ahds[0],
2006 ep, packet);
2007 } else
2008 /*
2009 * Packets in a bundle automatically have
2010 * this flag set.
2011 */
2012 packet->info.rx.indicat_flags |=
2013 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
2014
2015 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd);
2016
2017 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE)
2018 ep->ep_st.rx_bundl += 1;
2019
2020 ath6kl_htc_rx_complete(ep, packet);
2021 }
2022
2023 return status;
2024 }
2025
2026 static int ath6kl_htc_rx_fetch(struct htc_target *target,
2027 struct list_head *rx_pktq,
2028 struct list_head *comp_pktq)
2029 {
2030 int fetched_pkts;
2031 bool part_bundle = false;
2032 int status = 0;
2033 struct list_head tmp_rxq;
2034 struct htc_packet *packet, *tmp_pkt;
2035
2036 /* now go fetch the list of HTC packets */
2037 while (!list_empty(rx_pktq)) {
2038 fetched_pkts = 0;
2039
2040 INIT_LIST_HEAD(&tmp_rxq);
2041
2042 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) {
2043 /*
2044 * There are enough packets to attempt a
2045 * bundle transfer and recv bundling is
2046 * allowed.
2047 */
2048 status = ath6kl_htc_rx_bundle(target, rx_pktq,
2049 &tmp_rxq,
2050 &fetched_pkts,
2051 part_bundle);
2052 if (status)
2053 goto fail_rx;
2054
2055 if (!list_empty(rx_pktq))
2056 part_bundle = true;
2057
2058 list_splice_tail_init(&tmp_rxq, comp_pktq);
2059 }
2060
2061 if (!fetched_pkts) {
2062
2063 packet = list_first_entry(rx_pktq, struct htc_packet,
2064 list);
2065
2066 /* fully synchronous */
2067 packet->completion = NULL;
2068
2069 if (!list_is_singular(rx_pktq))
2070 /*
2071 * look_aheads in all packet
2072 * except the last one in the
2073 * bundle must be ignored
2074 */
2075 packet->info.rx.rx_flags |=
2076 HTC_RX_PKT_IGNORE_LOOKAHEAD;
2077
2078 /* go fetch the packet */
2079 status = ath6kl_htc_rx_packet(target, packet,
2080 packet->act_len);
2081
2082 list_move_tail(&packet->list, &tmp_rxq);
2083
2084 if (status)
2085 goto fail_rx;
2086
2087 list_splice_tail_init(&tmp_rxq, comp_pktq);
2088 }
2089 }
2090
2091 return 0;
2092
2093 fail_rx:
2094
2095 /*
2096 * Cleanup any packets we allocated but didn't use to
2097 * actually fetch any packets.
2098 */
2099
2100 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) {
2101 list_del(&packet->list);
2102 htc_reclaim_rxbuf(target, packet,
2103 &target->endpoint[packet->endpoint]);
2104 }
2105
2106 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) {
2107 list_del(&packet->list);
2108 htc_reclaim_rxbuf(target, packet,
2109 &target->endpoint[packet->endpoint]);
2110 }
2111
2112 return status;
2113 }
2114
2115 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
2116 u32 msg_look_ahead, int *num_pkts)
2117 {
2118 struct htc_packet *packets, *tmp_pkt;
2119 struct htc_endpoint *endpoint;
2120 struct list_head rx_pktq, comp_pktq;
2121 int status = 0;
2122 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE];
2123 int num_look_ahead = 1;
2124 enum htc_endpoint_id id;
2125 int n_fetched = 0;
2126
2127 INIT_LIST_HEAD(&comp_pktq);
2128 *num_pkts = 0;
2129
2130 /*
2131 * On first entry copy the look_aheads into our temp array for
2132 * processing
2133 */
2134 look_aheads[0] = msg_look_ahead;
2135
2136 while (true) {
2137
2138 /*
2139 * First lookahead sets the expected endpoint IDs for all
2140 * packets in a bundle.
2141 */
2142 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid;
2143 endpoint = &target->endpoint[id];
2144
2145 if (id >= ENDPOINT_MAX) {
2146 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n",
2147 id);
2148 status = -ENOMEM;
2149 break;
2150 }
2151
2152 INIT_LIST_HEAD(&rx_pktq);
2153 INIT_LIST_HEAD(&comp_pktq);
2154
2155 /*
2156 * Try to allocate as many HTC RX packets indicated by the
2157 * look_aheads.
2158 */
2159 status = ath6kl_htc_rx_alloc(target, look_aheads,
2160 num_look_ahead, endpoint,
2161 &rx_pktq);
2162 if (status)
2163 break;
2164
2165 if (get_queue_depth(&rx_pktq) >= 2)
2166 /*
2167 * A recv bundle was detected, force IRQ status
2168 * re-check again
2169 */
2170 target->chk_irq_status_cnt = 1;
2171
2172 n_fetched += get_queue_depth(&rx_pktq);
2173
2174 num_look_ahead = 0;
2175
2176 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq);
2177
2178 if (!status)
2179 ath6kl_htc_rx_chk_water_mark(endpoint);
2180
2181 /* Process fetched packets */
2182 status = ath6kl_htc_rx_process_packets(target, &comp_pktq,
2183 look_aheads,
2184 &num_look_ahead);
2185
2186 if (!num_look_ahead || status)
2187 break;
2188
2189 /*
2190 * For SYNCH processing, if we get here, we are running
2191 * through the loop again due to a detected lookahead. Set
2192 * flag that we should re-check IRQ status registers again
2193 * before leaving IRQ processing, this can net better
2194 * performance in high throughput situations.
2195 */
2196 target->chk_irq_status_cnt = 1;
2197 }
2198
2199 if (status) {
2200 ath6kl_err("failed to get pending recv messages: %d\n",
2201 status);
2202
2203 /* cleanup any packets in sync completion queue */
2204 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) {
2205 list_del(&packets->list);
2206 htc_reclaim_rxbuf(target, packets,
2207 &target->endpoint[packets->endpoint]);
2208 }
2209
2210 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2211 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n");
2212 ath6kl_hif_rx_control(target->dev, false);
2213 }
2214 }
2215
2216 /*
2217 * Before leaving, check to see if host ran out of buffers and
2218 * needs to stop the receiver.
2219 */
2220 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2221 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n");
2222 ath6kl_hif_rx_control(target->dev, false);
2223 }
2224 *num_pkts = n_fetched;
2225
2226 return status;
2227 }
2228
2229 /*
2230 * Synchronously wait for a control message from the target,
2231 * This function is used at initialization time ONLY. At init messages
2232 * on ENDPOINT 0 are expected.
2233 */
2234 static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target)
2235 {
2236 struct htc_packet *packet = NULL;
2237 struct htc_frame_hdr *htc_hdr;
2238 u32 look_ahead;
2239
2240 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead,
2241 HTC_TARGET_RESPONSE_TIMEOUT))
2242 return NULL;
2243
2244 ath6kl_dbg(ATH6KL_DBG_HTC,
2245 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead);
2246
2247 htc_hdr = (struct htc_frame_hdr *)&look_ahead;
2248
2249 if (htc_hdr->eid != ENDPOINT_0)
2250 return NULL;
2251
2252 packet = htc_get_control_buf(target, false);
2253
2254 if (!packet)
2255 return NULL;
2256
2257 packet->info.rx.rx_flags = 0;
2258 packet->info.rx.exp_hdr = look_ahead;
2259 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH;
2260
2261 if (packet->act_len > packet->buf_len)
2262 goto fail_ctrl_rx;
2263
2264 /* we want synchronous operation */
2265 packet->completion = NULL;
2266
2267 /* get the message from the device, this will block */
2268 if (ath6kl_htc_rx_packet(target, packet, packet->act_len))
2269 goto fail_ctrl_rx;
2270
2271 /* process receive header */
2272 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL);
2273
2274 if (packet->status) {
2275 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n",
2276 packet->status);
2277 goto fail_ctrl_rx;
2278 }
2279
2280 return packet;
2281
2282 fail_ctrl_rx:
2283 if (packet != NULL) {
2284 htc_rxpkt_reset(packet);
2285 reclaim_rx_ctrl_buf(target, packet);
2286 }
2287
2288 return NULL;
2289 }
2290
2291 int ath6kl_htc_add_rxbuf_multiple(struct htc_target *target,
2292 struct list_head *pkt_queue)
2293 {
2294 struct htc_endpoint *endpoint;
2295 struct htc_packet *first_pkt;
2296 bool rx_unblock = false;
2297 int status = 0, depth;
2298
2299 if (list_empty(pkt_queue))
2300 return -ENOMEM;
2301
2302 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list);
2303
2304 if (first_pkt->endpoint >= ENDPOINT_MAX)
2305 return status;
2306
2307 depth = get_queue_depth(pkt_queue);
2308
2309 ath6kl_dbg(ATH6KL_DBG_HTC,
2310 "htc rx add multiple ep id %d cnt %d len %d\n",
2311 first_pkt->endpoint, depth, first_pkt->buf_len);
2312
2313 endpoint = &target->endpoint[first_pkt->endpoint];
2314
2315 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2316 struct htc_packet *packet, *tmp_pkt;
2317
2318 /* walk through queue and mark each one canceled */
2319 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
2320 packet->status = -ECANCELED;
2321 list_del(&packet->list);
2322 ath6kl_htc_rx_complete(endpoint, packet);
2323 }
2324
2325 return status;
2326 }
2327
2328 spin_lock_bh(&target->rx_lock);
2329
2330 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq);
2331
2332 /* check if we are blocked waiting for a new buffer */
2333 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2334 if (target->ep_waiting == first_pkt->endpoint) {
2335 ath6kl_dbg(ATH6KL_DBG_HTC,
2336 "htc rx blocked on ep %d, unblocking\n",
2337 target->ep_waiting);
2338 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS;
2339 target->ep_waiting = ENDPOINT_MAX;
2340 rx_unblock = true;
2341 }
2342 }
2343
2344 spin_unlock_bh(&target->rx_lock);
2345
2346 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING))
2347 /* TODO : implement a buffer threshold count? */
2348 ath6kl_hif_rx_control(target->dev, true);
2349
2350 return status;
2351 }
2352
2353 void ath6kl_htc_flush_rx_buf(struct htc_target *target)
2354 {
2355 struct htc_endpoint *endpoint;
2356 struct htc_packet *packet, *tmp_pkt;
2357 int i;
2358
2359 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2360 endpoint = &target->endpoint[i];
2361 if (!endpoint->svc_id)
2362 /* not in use.. */
2363 continue;
2364
2365 spin_lock_bh(&target->rx_lock);
2366 list_for_each_entry_safe(packet, tmp_pkt,
2367 &endpoint->rx_bufq, list) {
2368 list_del(&packet->list);
2369 spin_unlock_bh(&target->rx_lock);
2370 ath6kl_dbg(ATH6KL_DBG_HTC,
2371 "htc rx flush pkt 0x%p len %d ep %d\n",
2372 packet, packet->buf_len,
2373 packet->endpoint);
2374 /*
2375 * packets in rx_bufq of endpoint 0 have originally
2376 * been queued from target->free_ctrl_rxbuf where
2377 * packet and packet->buf_start are allocated
2378 * separately using kmalloc(). For other endpoint
2379 * rx_bufq, it is allocated as skb where packet is
2380 * skb->head. Take care of this difference while freeing
2381 * the memory.
2382 */
2383 if (packet->endpoint == ENDPOINT_0) {
2384 kfree(packet->buf_start);
2385 kfree(packet);
2386 } else {
2387 dev_kfree_skb(packet->pkt_cntxt);
2388 }
2389 spin_lock_bh(&target->rx_lock);
2390 }
2391 spin_unlock_bh(&target->rx_lock);
2392 }
2393 }
2394
2395 int ath6kl_htc_conn_service(struct htc_target *target,
2396 struct htc_service_connect_req *conn_req,
2397 struct htc_service_connect_resp *conn_resp)
2398 {
2399 struct htc_packet *rx_pkt = NULL;
2400 struct htc_packet *tx_pkt = NULL;
2401 struct htc_conn_service_resp *resp_msg;
2402 struct htc_conn_service_msg *conn_msg;
2403 struct htc_endpoint *endpoint;
2404 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX;
2405 unsigned int max_msg_sz = 0;
2406 int status = 0;
2407 u16 msg_id;
2408
2409 ath6kl_dbg(ATH6KL_DBG_HTC,
2410 "htc connect service target 0x%p service id 0x%x\n",
2411 target, conn_req->svc_id);
2412
2413 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) {
2414 /* special case for pseudo control service */
2415 assigned_ep = ENDPOINT_0;
2416 max_msg_sz = HTC_MAX_CTRL_MSG_LEN;
2417 } else {
2418 /* allocate a packet to send to the target */
2419 tx_pkt = htc_get_control_buf(target, true);
2420
2421 if (!tx_pkt)
2422 return -ENOMEM;
2423
2424 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf;
2425 memset(conn_msg, 0, sizeof(*conn_msg));
2426 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID);
2427 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id);
2428 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags);
2429
2430 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg,
2431 sizeof(*conn_msg) + conn_msg->svc_meta_len,
2432 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
2433
2434 /* we want synchronous operation */
2435 tx_pkt->completion = NULL;
2436 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0);
2437 status = ath6kl_htc_tx_issue(target, tx_pkt);
2438
2439 if (status)
2440 goto fail_tx;
2441
2442 /* wait for response */
2443 rx_pkt = htc_wait_for_ctrl_msg(target);
2444
2445 if (!rx_pkt) {
2446 status = -ENOMEM;
2447 goto fail_tx;
2448 }
2449
2450 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf;
2451 msg_id = le16_to_cpu(resp_msg->msg_id);
2452
2453 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) ||
2454 (rx_pkt->act_len < sizeof(*resp_msg))) {
2455 status = -ENOMEM;
2456 goto fail_tx;
2457 }
2458
2459 conn_resp->resp_code = resp_msg->status;
2460 /* check response status */
2461 if (resp_msg->status != HTC_SERVICE_SUCCESS) {
2462 ath6kl_err("target failed service 0x%X connect request (status:%d)\n",
2463 resp_msg->svc_id, resp_msg->status);
2464 status = -ENOMEM;
2465 goto fail_tx;
2466 }
2467
2468 assigned_ep = (enum htc_endpoint_id)resp_msg->eid;
2469 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz);
2470 }
2471
2472 if (assigned_ep >= ENDPOINT_MAX || !max_msg_sz) {
2473 status = -ENOMEM;
2474 goto fail_tx;
2475 }
2476
2477 endpoint = &target->endpoint[assigned_ep];
2478 endpoint->eid = assigned_ep;
2479 if (endpoint->svc_id) {
2480 status = -ENOMEM;
2481 goto fail_tx;
2482 }
2483
2484 /* return assigned endpoint to caller */
2485 conn_resp->endpoint = assigned_ep;
2486 conn_resp->len_max = max_msg_sz;
2487
2488 /* setup the endpoint */
2489
2490 /* this marks the endpoint in use */
2491 endpoint->svc_id = conn_req->svc_id;
2492
2493 endpoint->max_txq_depth = conn_req->max_txq_depth;
2494 endpoint->len_max = max_msg_sz;
2495 endpoint->ep_cb = conn_req->ep_cb;
2496 endpoint->cred_dist.svc_id = conn_req->svc_id;
2497 endpoint->cred_dist.htc_ep = endpoint;
2498 endpoint->cred_dist.endpoint = assigned_ep;
2499 endpoint->cred_dist.cred_sz = target->tgt_cred_sz;
2500
2501 switch (endpoint->svc_id) {
2502 case WMI_DATA_BK_SVC:
2503 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3;
2504 break;
2505 default:
2506 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM;
2507 break;
2508 }
2509
2510 if (conn_req->max_rxmsg_sz) {
2511 /*
2512 * Override cred_per_msg calculation, this optimizes
2513 * the credit-low indications since the host will actually
2514 * issue smaller messages in the Send path.
2515 */
2516 if (conn_req->max_rxmsg_sz > max_msg_sz) {
2517 status = -ENOMEM;
2518 goto fail_tx;
2519 }
2520 endpoint->cred_dist.cred_per_msg =
2521 conn_req->max_rxmsg_sz / target->tgt_cred_sz;
2522 } else
2523 endpoint->cred_dist.cred_per_msg =
2524 max_msg_sz / target->tgt_cred_sz;
2525
2526 if (!endpoint->cred_dist.cred_per_msg)
2527 endpoint->cred_dist.cred_per_msg = 1;
2528
2529 /* save local connection flags */
2530 endpoint->conn_flags = conn_req->flags;
2531
2532 fail_tx:
2533 if (tx_pkt)
2534 htc_reclaim_txctrl_buf(target, tx_pkt);
2535
2536 if (rx_pkt) {
2537 htc_rxpkt_reset(rx_pkt);
2538 reclaim_rx_ctrl_buf(target, rx_pkt);
2539 }
2540
2541 return status;
2542 }
2543
2544 static void reset_ep_state(struct htc_target *target)
2545 {
2546 struct htc_endpoint *endpoint;
2547 int i;
2548
2549 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2550 endpoint = &target->endpoint[i];
2551 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist));
2552 endpoint->svc_id = 0;
2553 endpoint->len_max = 0;
2554 endpoint->max_txq_depth = 0;
2555 memset(&endpoint->ep_st, 0,
2556 sizeof(endpoint->ep_st));
2557 INIT_LIST_HEAD(&endpoint->rx_bufq);
2558 INIT_LIST_HEAD(&endpoint->txq);
2559 endpoint->target = target;
2560 }
2561
2562 /* reset distribution list */
2563 /* FIXME: free existing entries */
2564 INIT_LIST_HEAD(&target->cred_dist_list);
2565 }
2566
2567 int ath6kl_htc_get_rxbuf_num(struct htc_target *target,
2568 enum htc_endpoint_id endpoint)
2569 {
2570 int num;
2571
2572 spin_lock_bh(&target->rx_lock);
2573 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq));
2574 spin_unlock_bh(&target->rx_lock);
2575 return num;
2576 }
2577
2578 static void htc_setup_msg_bndl(struct htc_target *target)
2579 {
2580 /* limit what HTC can handle */
2581 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE,
2582 target->msg_per_bndl_max);
2583
2584 if (ath6kl_hif_enable_scatter(target->dev->ar)) {
2585 target->msg_per_bndl_max = 0;
2586 return;
2587 }
2588
2589 /* limit bundle what the device layer can handle */
2590 target->msg_per_bndl_max = min(target->max_scat_entries,
2591 target->msg_per_bndl_max);
2592
2593 ath6kl_dbg(ATH6KL_DBG_BOOT,
2594 "htc bundling allowed msg_per_bndl_max %d\n",
2595 target->msg_per_bndl_max);
2596
2597 /* Max rx bundle size is limited by the max tx bundle size */
2598 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq;
2599 /* Max tx bundle size if limited by the extended mbox address range */
2600 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH,
2601 target->max_xfer_szper_scatreq);
2602
2603 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n",
2604 target->max_rx_bndl_sz, target->max_tx_bndl_sz);
2605
2606 if (target->max_tx_bndl_sz)
2607 /* tx_bndl_mask is enabled per AC, each has 1 bit */
2608 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1;
2609
2610 if (target->max_rx_bndl_sz)
2611 target->rx_bndl_enable = true;
2612
2613 if ((target->tgt_cred_sz % target->block_sz) != 0) {
2614 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n",
2615 target->tgt_cred_sz);
2616
2617 /*
2618 * Disallow send bundling since the credit size is
2619 * not aligned to a block size the I/O block
2620 * padding will spill into the next credit buffer
2621 * which is fatal.
2622 */
2623 target->tx_bndl_mask = 0;
2624 }
2625 }
2626
2627 int ath6kl_htc_wait_target(struct htc_target *target)
2628 {
2629 struct htc_packet *packet = NULL;
2630 struct htc_ready_ext_msg *rdy_msg;
2631 struct htc_service_connect_req connect;
2632 struct htc_service_connect_resp resp;
2633 int status;
2634
2635 /* FIXME: remove once USB support is implemented */
2636 if (target->dev->ar->hif_type == ATH6KL_HIF_TYPE_USB) {
2637 ath6kl_err("HTC doesn't support USB yet. Patience!\n");
2638 return -EOPNOTSUPP;
2639 }
2640
2641 /* we should be getting 1 control message that the target is ready */
2642 packet = htc_wait_for_ctrl_msg(target);
2643
2644 if (!packet)
2645 return -ENOMEM;
2646
2647 /* we controlled the buffer creation so it's properly aligned */
2648 rdy_msg = (struct htc_ready_ext_msg *)packet->buf;
2649
2650 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) ||
2651 (packet->act_len < sizeof(struct htc_ready_msg))) {
2652 status = -ENOMEM;
2653 goto fail_wait_target;
2654 }
2655
2656 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) {
2657 status = -ENOMEM;
2658 goto fail_wait_target;
2659 }
2660
2661 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt);
2662 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz);
2663
2664 ath6kl_dbg(ATH6KL_DBG_BOOT,
2665 "htc target ready credits %d size %d\n",
2666 target->tgt_creds, target->tgt_cred_sz);
2667
2668 /* check if this is an extended ready message */
2669 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) {
2670 /* this is an extended message */
2671 target->htc_tgt_ver = rdy_msg->htc_ver;
2672 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl;
2673 } else {
2674 /* legacy */
2675 target->htc_tgt_ver = HTC_VERSION_2P0;
2676 target->msg_per_bndl_max = 0;
2677 }
2678
2679 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n",
2680 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1",
2681 target->htc_tgt_ver);
2682
2683 if (target->msg_per_bndl_max > 0)
2684 htc_setup_msg_bndl(target);
2685
2686 /* setup our pseudo HTC control endpoint connection */
2687 memset(&connect, 0, sizeof(connect));
2688 memset(&resp, 0, sizeof(resp));
2689 connect.ep_cb.rx = htc_ctrl_rx;
2690 connect.ep_cb.rx_refill = NULL;
2691 connect.ep_cb.tx_full = NULL;
2692 connect.max_txq_depth = NUM_CONTROL_BUFFERS;
2693 connect.svc_id = HTC_CTRL_RSVD_SVC;
2694
2695 /* connect fake service */
2696 status = ath6kl_htc_conn_service((void *)target, &connect, &resp);
2697
2698 if (status)
2699 /*
2700 * FIXME: this call doesn't make sense, the caller should
2701 * call ath6kl_htc_cleanup() when it wants remove htc
2702 */
2703 ath6kl_hif_cleanup_scatter(target->dev->ar);
2704
2705 fail_wait_target:
2706 if (packet) {
2707 htc_rxpkt_reset(packet);
2708 reclaim_rx_ctrl_buf(target, packet);
2709 }
2710
2711 return status;
2712 }
2713
2714 /*
2715 * Start HTC, enable interrupts and let the target know
2716 * host has finished setup.
2717 */
2718 int ath6kl_htc_start(struct htc_target *target)
2719 {
2720 struct htc_packet *packet;
2721 int status;
2722
2723 memset(&target->dev->irq_proc_reg, 0,
2724 sizeof(target->dev->irq_proc_reg));
2725
2726 /* Disable interrupts at the chip level */
2727 ath6kl_hif_disable_intrs(target->dev);
2728
2729 target->htc_flags = 0;
2730 target->rx_st_flags = 0;
2731
2732 /* Push control receive buffers into htc control endpoint */
2733 while ((packet = htc_get_control_buf(target, false)) != NULL) {
2734 status = htc_add_rxbuf(target, packet);
2735 if (status)
2736 return status;
2737 }
2738
2739 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */
2740 ath6kl_credit_init(target->credit_info, &target->cred_dist_list,
2741 target->tgt_creds);
2742
2743 dump_cred_dist_stats(target);
2744
2745 /* Indicate to the target of the setup completion */
2746 status = htc_setup_tx_complete(target);
2747
2748 if (status)
2749 return status;
2750
2751 /* unmask interrupts */
2752 status = ath6kl_hif_unmask_intrs(target->dev);
2753
2754 if (status)
2755 ath6kl_htc_stop(target);
2756
2757 return status;
2758 }
2759
2760 static int ath6kl_htc_reset(struct htc_target *target)
2761 {
2762 u32 block_size, ctrl_bufsz;
2763 struct htc_packet *packet;
2764 int i;
2765
2766 reset_ep_state(target);
2767
2768 block_size = target->dev->ar->mbox_info.block_size;
2769
2770 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ?
2771 (block_size + HTC_HDR_LENGTH) :
2772 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH);
2773
2774 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) {
2775 packet = kzalloc(sizeof(*packet), GFP_KERNEL);
2776 if (!packet)
2777 return -ENOMEM;
2778
2779 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL);
2780 if (!packet->buf_start) {
2781 kfree(packet);
2782 return -ENOMEM;
2783 }
2784
2785 packet->buf_len = ctrl_bufsz;
2786 if (i < NUM_CONTROL_RX_BUFFERS) {
2787 packet->act_len = 0;
2788 packet->buf = packet->buf_start;
2789 packet->endpoint = ENDPOINT_0;
2790 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
2791 } else
2792 list_add_tail(&packet->list, &target->free_ctrl_txbuf);
2793 }
2794
2795 return 0;
2796 }
2797
2798 /* htc_stop: stop interrupt reception, and flush all queued buffers */
2799 void ath6kl_htc_stop(struct htc_target *target)
2800 {
2801 spin_lock_bh(&target->htc_lock);
2802 target->htc_flags |= HTC_OP_STATE_STOPPING;
2803 spin_unlock_bh(&target->htc_lock);
2804
2805 /*
2806 * Masking interrupts is a synchronous operation, when this
2807 * function returns all pending HIF I/O has completed, we can
2808 * safely flush the queues.
2809 */
2810 ath6kl_hif_mask_intrs(target->dev);
2811
2812 ath6kl_htc_flush_txep_all(target);
2813
2814 ath6kl_htc_flush_rx_buf(target);
2815
2816 ath6kl_htc_reset(target);
2817 }
2818
2819 void *ath6kl_htc_create(struct ath6kl *ar)
2820 {
2821 struct htc_target *target = NULL;
2822 int status = 0;
2823
2824 target = kzalloc(sizeof(*target), GFP_KERNEL);
2825 if (!target) {
2826 ath6kl_err("unable to allocate memory\n");
2827 return NULL;
2828 }
2829
2830 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL);
2831 if (!target->dev) {
2832 ath6kl_err("unable to allocate memory\n");
2833 status = -ENOMEM;
2834 goto err_htc_cleanup;
2835 }
2836
2837 spin_lock_init(&target->htc_lock);
2838 spin_lock_init(&target->rx_lock);
2839 spin_lock_init(&target->tx_lock);
2840
2841 INIT_LIST_HEAD(&target->free_ctrl_txbuf);
2842 INIT_LIST_HEAD(&target->free_ctrl_rxbuf);
2843 INIT_LIST_HEAD(&target->cred_dist_list);
2844
2845 target->dev->ar = ar;
2846 target->dev->htc_cnxt = target;
2847 target->ep_waiting = ENDPOINT_MAX;
2848
2849 status = ath6kl_hif_setup(target->dev);
2850 if (status)
2851 goto err_htc_cleanup;
2852
2853 status = ath6kl_htc_reset(target);
2854 if (status)
2855 goto err_htc_cleanup;
2856
2857 return target;
2858
2859 err_htc_cleanup:
2860 ath6kl_htc_cleanup(target);
2861
2862 return NULL;
2863 }
2864
2865 /* cleanup the HTC instance */
2866 void ath6kl_htc_cleanup(struct htc_target *target)
2867 {
2868 struct htc_packet *packet, *tmp_packet;
2869
2870 /* FIXME: remove check once USB support is implemented */
2871 if (target->dev->ar->hif_type != ATH6KL_HIF_TYPE_USB)
2872 ath6kl_hif_cleanup_scatter(target->dev->ar);
2873
2874 list_for_each_entry_safe(packet, tmp_packet,
2875 &target->free_ctrl_txbuf, list) {
2876 list_del(&packet->list);
2877 kfree(packet->buf_start);
2878 kfree(packet);
2879 }
2880
2881 list_for_each_entry_safe(packet, tmp_packet,
2882 &target->free_ctrl_rxbuf, list) {
2883 list_del(&packet->list);
2884 kfree(packet->buf_start);
2885 kfree(packet);
2886 }
2887
2888 kfree(target->dev);
2889 kfree(target);
2890 }
Linux kernel - Deliverables
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