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ath6kl: don't set hi_refclk_hz if hardware version doesn't need it
[deliverable/linux.git] / drivers / net / wireless / ath / ath6kl / htc_mbox.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 "trace.h"
23
24 #include <asm/unaligned.h>
25
26 #define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask))
27
28 static void ath6kl_htc_mbox_cleanup(struct htc_target *target);
29 static void ath6kl_htc_mbox_stop(struct htc_target *target);
30 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target,
31 struct list_head *pkt_queue);
32 static void ath6kl_htc_set_credit_dist(struct htc_target *target,
33 struct ath6kl_htc_credit_info *cred_info,
34 u16 svc_pri_order[], int len);
35
36 /* threshold to re-enable Tx bundling for an AC*/
37 #define TX_RESUME_BUNDLE_THRESHOLD 1500
38
39 /* Functions for Tx credit handling */
40 static void ath6kl_credit_deposit(struct ath6kl_htc_credit_info *cred_info,
41 struct htc_endpoint_credit_dist *ep_dist,
42 int credits)
43 {
44 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit deposit ep %d credits %d\n",
45 ep_dist->endpoint, credits);
46
47 ep_dist->credits += credits;
48 ep_dist->cred_assngd += credits;
49 cred_info->cur_free_credits -= credits;
50 }
51
52 static void ath6kl_credit_init(struct ath6kl_htc_credit_info *cred_info,
53 struct list_head *ep_list,
54 int tot_credits)
55 {
56 struct htc_endpoint_credit_dist *cur_ep_dist;
57 int count;
58
59 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit init total %d\n", tot_credits);
60
61 cred_info->cur_free_credits = tot_credits;
62 cred_info->total_avail_credits = tot_credits;
63
64 list_for_each_entry(cur_ep_dist, ep_list, list) {
65 if (cur_ep_dist->endpoint == ENDPOINT_0)
66 continue;
67
68 cur_ep_dist->cred_min = cur_ep_dist->cred_per_msg;
69
70 if (tot_credits > 4) {
71 if ((cur_ep_dist->svc_id == WMI_DATA_BK_SVC) ||
72 (cur_ep_dist->svc_id == WMI_DATA_BE_SVC)) {
73 ath6kl_credit_deposit(cred_info,
74 cur_ep_dist,
75 cur_ep_dist->cred_min);
76 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
77 }
78 }
79
80 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) {
81 ath6kl_credit_deposit(cred_info, cur_ep_dist,
82 cur_ep_dist->cred_min);
83 /*
84 * Control service is always marked active, it
85 * never goes inactive EVER.
86 */
87 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
88 }
89
90 /*
91 * Streams have to be created (explicit | implicit) for all
92 * kinds of traffic. BE endpoints are also inactive in the
93 * beginning. When BE traffic starts it creates implicit
94 * streams that redistributes credits.
95 *
96 * Note: all other endpoints have minimums set but are
97 * initially given NO credits. credits will be distributed
98 * as traffic activity demands
99 */
100 }
101
102 /*
103 * For ath6kl_credit_seek function,
104 * it use list_for_each_entry_reverse to walk around the whole ep list.
105 * Therefore assign this lowestpri_ep_dist after walk around the ep_list
106 */
107 cred_info->lowestpri_ep_dist = cur_ep_dist->list;
108
109 WARN_ON(cred_info->cur_free_credits <= 0);
110
111 list_for_each_entry(cur_ep_dist, ep_list, list) {
112 if (cur_ep_dist->endpoint == ENDPOINT_0)
113 continue;
114
115 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) {
116 cur_ep_dist->cred_norm = cur_ep_dist->cred_per_msg;
117 } else {
118 /*
119 * For the remaining data endpoints, we assume that
120 * each cred_per_msg are the same. We use a simple
121 * calculation here, we take the remaining credits
122 * and determine how many max messages this can
123 * cover and then set each endpoint's normal value
124 * equal to 3/4 this amount.
125 */
126 count = (cred_info->cur_free_credits /
127 cur_ep_dist->cred_per_msg)
128 * cur_ep_dist->cred_per_msg;
129 count = (count * 3) >> 2;
130 count = max(count, cur_ep_dist->cred_per_msg);
131 cur_ep_dist->cred_norm = count;
132 }
133
134 ath6kl_dbg(ATH6KL_DBG_CREDIT,
135 "credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n",
136 cur_ep_dist->endpoint,
137 cur_ep_dist->svc_id,
138 cur_ep_dist->credits,
139 cur_ep_dist->cred_per_msg,
140 cur_ep_dist->cred_norm,
141 cur_ep_dist->cred_min);
142 }
143 }
144
145 /* initialize and setup credit distribution */
146 static int ath6kl_htc_mbox_credit_setup(struct htc_target *htc_target,
147 struct ath6kl_htc_credit_info *cred_info)
148 {
149 u16 servicepriority[5];
150
151 memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info));
152
153 servicepriority[0] = WMI_CONTROL_SVC; /* highest */
154 servicepriority[1] = WMI_DATA_VO_SVC;
155 servicepriority[2] = WMI_DATA_VI_SVC;
156 servicepriority[3] = WMI_DATA_BE_SVC;
157 servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */
158
159 /* set priority list */
160 ath6kl_htc_set_credit_dist(htc_target, cred_info, servicepriority, 5);
161
162 return 0;
163 }
164
165 /* reduce an ep's credits back to a set limit */
166 static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info,
167 struct htc_endpoint_credit_dist *ep_dist,
168 int limit)
169 {
170 int credits;
171
172 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n",
173 ep_dist->endpoint, limit);
174
175 ep_dist->cred_assngd = limit;
176
177 if (ep_dist->credits <= limit)
178 return;
179
180 credits = ep_dist->credits - limit;
181 ep_dist->credits -= credits;
182 cred_info->cur_free_credits += credits;
183 }
184
185 static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info,
186 struct list_head *epdist_list)
187 {
188 struct htc_endpoint_credit_dist *cur_list;
189
190 list_for_each_entry(cur_list, epdist_list, list) {
191 if (cur_list->endpoint == ENDPOINT_0)
192 continue;
193
194 if (cur_list->cred_to_dist > 0) {
195 cur_list->credits += cur_list->cred_to_dist;
196 cur_list->cred_to_dist = 0;
197
198 if (cur_list->credits > cur_list->cred_assngd)
199 ath6kl_credit_reduce(cred_info,
200 cur_list,
201 cur_list->cred_assngd);
202
203 if (cur_list->credits > cur_list->cred_norm)
204 ath6kl_credit_reduce(cred_info, cur_list,
205 cur_list->cred_norm);
206
207 if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) {
208 if (cur_list->txq_depth == 0)
209 ath6kl_credit_reduce(cred_info,
210 cur_list, 0);
211 }
212 }
213 }
214 }
215
216 /*
217 * HTC has an endpoint that needs credits, ep_dist is the endpoint in
218 * question.
219 */
220 static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info,
221 struct htc_endpoint_credit_dist *ep_dist)
222 {
223 struct htc_endpoint_credit_dist *curdist_list;
224 int credits = 0;
225 int need;
226
227 if (ep_dist->svc_id == WMI_CONTROL_SVC)
228 goto out;
229
230 if ((ep_dist->svc_id == WMI_DATA_VI_SVC) ||
231 (ep_dist->svc_id == WMI_DATA_VO_SVC))
232 if ((ep_dist->cred_assngd >= ep_dist->cred_norm))
233 goto out;
234
235 /*
236 * For all other services, we follow a simple algorithm of:
237 *
238 * 1. checking the free pool for credits
239 * 2. checking lower priority endpoints for credits to take
240 */
241
242 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
243
244 if (credits >= ep_dist->seek_cred)
245 goto out;
246
247 /*
248 * We don't have enough in the free pool, try taking away from
249 * lower priority services The rule for taking away credits:
250 *
251 * 1. Only take from lower priority endpoints
252 * 2. Only take what is allocated above the minimum (never
253 * starve an endpoint completely)
254 * 3. Only take what you need.
255 */
256
257 list_for_each_entry_reverse(curdist_list,
258 &cred_info->lowestpri_ep_dist,
259 list) {
260 if (curdist_list == ep_dist)
261 break;
262
263 need = ep_dist->seek_cred - cred_info->cur_free_credits;
264
265 if ((curdist_list->cred_assngd - need) >=
266 curdist_list->cred_min) {
267 /*
268 * The current one has been allocated more than
269 * it's minimum and it has enough credits assigned
270 * above it's minimum to fulfill our need try to
271 * take away just enough to fulfill our need.
272 */
273 ath6kl_credit_reduce(cred_info, curdist_list,
274 curdist_list->cred_assngd - need);
275
276 if (cred_info->cur_free_credits >=
277 ep_dist->seek_cred)
278 break;
279 }
280
281 if (curdist_list->endpoint == ENDPOINT_0)
282 break;
283 }
284
285 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
286
287 out:
288 /* did we find some credits? */
289 if (credits)
290 ath6kl_credit_deposit(cred_info, ep_dist, credits);
291
292 ep_dist->seek_cred = 0;
293 }
294
295 /* redistribute credits based on activity change */
296 static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info,
297 struct list_head *ep_dist_list)
298 {
299 struct htc_endpoint_credit_dist *curdist_list;
300
301 list_for_each_entry(curdist_list, ep_dist_list, list) {
302 if (curdist_list->endpoint == ENDPOINT_0)
303 continue;
304
305 if ((curdist_list->svc_id == WMI_DATA_BK_SVC) ||
306 (curdist_list->svc_id == WMI_DATA_BE_SVC))
307 curdist_list->dist_flags |= HTC_EP_ACTIVE;
308
309 if ((curdist_list->svc_id != WMI_CONTROL_SVC) &&
310 !(curdist_list->dist_flags & HTC_EP_ACTIVE)) {
311 if (curdist_list->txq_depth == 0)
312 ath6kl_credit_reduce(info, curdist_list, 0);
313 else
314 ath6kl_credit_reduce(info,
315 curdist_list,
316 curdist_list->cred_min);
317 }
318 }
319 }
320
321 /*
322 *
323 * This function is invoked whenever endpoints require credit
324 * distributions. A lock is held while this function is invoked, this
325 * function shall NOT block. The ep_dist_list is a list of distribution
326 * structures in prioritized order as defined by the call to the
327 * htc_set_credit_dist() api.
328 */
329 static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info,
330 struct list_head *ep_dist_list,
331 enum htc_credit_dist_reason reason)
332 {
333 switch (reason) {
334 case HTC_CREDIT_DIST_SEND_COMPLETE:
335 ath6kl_credit_update(cred_info, ep_dist_list);
336 break;
337 case HTC_CREDIT_DIST_ACTIVITY_CHANGE:
338 ath6kl_credit_redistribute(cred_info, ep_dist_list);
339 break;
340 default:
341 break;
342 }
343
344 WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits);
345 WARN_ON(cred_info->cur_free_credits < 0);
346 }
347
348 static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len)
349 {
350 u8 *align_addr;
351
352 if (!IS_ALIGNED((unsigned long) *buf, 4)) {
353 align_addr = PTR_ALIGN(*buf - 4, 4);
354 memmove(align_addr, *buf, len);
355 *buf = align_addr;
356 }
357 }
358
359 static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags,
360 int ctrl0, int ctrl1)
361 {
362 struct htc_frame_hdr *hdr;
363
364 packet->buf -= HTC_HDR_LENGTH;
365 hdr = (struct htc_frame_hdr *)packet->buf;
366
367 /* Endianess? */
368 put_unaligned((u16)packet->act_len, &hdr->payld_len);
369 hdr->flags = flags;
370 hdr->eid = packet->endpoint;
371 hdr->ctrl[0] = ctrl0;
372 hdr->ctrl[1] = ctrl1;
373 }
374
375 static void htc_reclaim_txctrl_buf(struct htc_target *target,
376 struct htc_packet *pkt)
377 {
378 spin_lock_bh(&target->htc_lock);
379 list_add_tail(&pkt->list, &target->free_ctrl_txbuf);
380 spin_unlock_bh(&target->htc_lock);
381 }
382
383 static struct htc_packet *htc_get_control_buf(struct htc_target *target,
384 bool tx)
385 {
386 struct htc_packet *packet = NULL;
387 struct list_head *buf_list;
388
389 buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf;
390
391 spin_lock_bh(&target->htc_lock);
392
393 if (list_empty(buf_list)) {
394 spin_unlock_bh(&target->htc_lock);
395 return NULL;
396 }
397
398 packet = list_first_entry(buf_list, struct htc_packet, list);
399 list_del(&packet->list);
400 spin_unlock_bh(&target->htc_lock);
401
402 if (tx)
403 packet->buf = packet->buf_start + HTC_HDR_LENGTH;
404
405 return packet;
406 }
407
408 static void htc_tx_comp_update(struct htc_target *target,
409 struct htc_endpoint *endpoint,
410 struct htc_packet *packet)
411 {
412 packet->completion = NULL;
413 packet->buf += HTC_HDR_LENGTH;
414
415 if (!packet->status)
416 return;
417
418 ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n",
419 packet->status, packet->endpoint, packet->act_len,
420 packet->info.tx.cred_used);
421
422 /* on failure to submit, reclaim credits for this packet */
423 spin_lock_bh(&target->tx_lock);
424 endpoint->cred_dist.cred_to_dist +=
425 packet->info.tx.cred_used;
426 endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq);
427
428 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n",
429 target->credit_info, &target->cred_dist_list);
430
431 ath6kl_credit_distribute(target->credit_info,
432 &target->cred_dist_list,
433 HTC_CREDIT_DIST_SEND_COMPLETE);
434
435 spin_unlock_bh(&target->tx_lock);
436 }
437
438 static void htc_tx_complete(struct htc_endpoint *endpoint,
439 struct list_head *txq)
440 {
441 if (list_empty(txq))
442 return;
443
444 ath6kl_dbg(ATH6KL_DBG_HTC,
445 "htc tx complete ep %d pkts %d\n",
446 endpoint->eid, get_queue_depth(txq));
447
448 ath6kl_tx_complete(endpoint->target, txq);
449 }
450
451 static void htc_tx_comp_handler(struct htc_target *target,
452 struct htc_packet *packet)
453 {
454 struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint];
455 struct list_head container;
456
457 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n",
458 packet->info.tx.seqno);
459
460 htc_tx_comp_update(target, endpoint, packet);
461 INIT_LIST_HEAD(&container);
462 list_add_tail(&packet->list, &container);
463 /* do completion */
464 htc_tx_complete(endpoint, &container);
465 }
466
467 static void htc_async_tx_scat_complete(struct htc_target *target,
468 struct hif_scatter_req *scat_req)
469 {
470 struct htc_endpoint *endpoint;
471 struct htc_packet *packet;
472 struct list_head tx_compq;
473 int i;
474
475 INIT_LIST_HEAD(&tx_compq);
476
477 ath6kl_dbg(ATH6KL_DBG_HTC,
478 "htc tx scat complete len %d entries %d\n",
479 scat_req->len, scat_req->scat_entries);
480
481 if (scat_req->status)
482 ath6kl_err("send scatter req failed: %d\n", scat_req->status);
483
484 packet = scat_req->scat_list[0].packet;
485 endpoint = &target->endpoint[packet->endpoint];
486
487 /* walk through the scatter list and process */
488 for (i = 0; i < scat_req->scat_entries; i++) {
489 packet = scat_req->scat_list[i].packet;
490 if (!packet) {
491 WARN_ON(1);
492 return;
493 }
494
495 packet->status = scat_req->status;
496 htc_tx_comp_update(target, endpoint, packet);
497 list_add_tail(&packet->list, &tx_compq);
498 }
499
500 /* free scatter request */
501 hif_scatter_req_add(target->dev->ar, scat_req);
502
503 /* complete all packets */
504 htc_tx_complete(endpoint, &tx_compq);
505 }
506
507 static int ath6kl_htc_tx_issue(struct htc_target *target,
508 struct htc_packet *packet)
509 {
510 int status;
511 bool sync = false;
512 u32 padded_len, send_len;
513
514 if (!packet->completion)
515 sync = true;
516
517 send_len = packet->act_len + HTC_HDR_LENGTH;
518
519 padded_len = CALC_TXRX_PADDED_LEN(target, send_len);
520
521 ath6kl_dbg(ATH6KL_DBG_HTC,
522 "htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n",
523 send_len, packet->info.tx.seqno, padded_len,
524 target->dev->ar->mbox_info.htc_addr,
525 sync ? "sync" : "async");
526
527 if (sync) {
528 status = hif_read_write_sync(target->dev->ar,
529 target->dev->ar->mbox_info.htc_addr,
530 packet->buf, padded_len,
531 HIF_WR_SYNC_BLOCK_INC);
532
533 packet->status = status;
534 packet->buf += HTC_HDR_LENGTH;
535 } else
536 status = hif_write_async(target->dev->ar,
537 target->dev->ar->mbox_info.htc_addr,
538 packet->buf, padded_len,
539 HIF_WR_ASYNC_BLOCK_INC, packet);
540
541 trace_ath6kl_htc_tx(status, packet->endpoint, packet->buf, send_len);
542
543 return status;
544 }
545
546 static int htc_check_credits(struct htc_target *target,
547 struct htc_endpoint *ep, u8 *flags,
548 enum htc_endpoint_id eid, unsigned int len,
549 int *req_cred)
550 {
551 *req_cred = (len > target->tgt_cred_sz) ?
552 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1;
553
554 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n",
555 *req_cred, ep->cred_dist.credits);
556
557 if (ep->cred_dist.credits < *req_cred) {
558 if (eid == ENDPOINT_0)
559 return -EINVAL;
560
561 /* Seek more credits */
562 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits;
563
564 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
565
566 ep->cred_dist.seek_cred = 0;
567
568 if (ep->cred_dist.credits < *req_cred) {
569 ath6kl_dbg(ATH6KL_DBG_CREDIT,
570 "credit not found for ep %d\n",
571 eid);
572 return -EINVAL;
573 }
574 }
575
576 ep->cred_dist.credits -= *req_cred;
577 ep->ep_st.cred_cosumd += *req_cred;
578
579 /* When we are getting low on credits, ask for more */
580 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
581 ep->cred_dist.seek_cred =
582 ep->cred_dist.cred_per_msg - ep->cred_dist.credits;
583
584 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
585
586 /* see if we were successful in getting more */
587 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
588 /* tell the target we need credits ASAP! */
589 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
590 ep->ep_st.cred_low_indicate += 1;
591 ath6kl_dbg(ATH6KL_DBG_CREDIT,
592 "credit we need credits asap\n");
593 }
594 }
595
596 return 0;
597 }
598
599 static void ath6kl_htc_tx_pkts_get(struct htc_target *target,
600 struct htc_endpoint *endpoint,
601 struct list_head *queue)
602 {
603 int req_cred;
604 u8 flags;
605 struct htc_packet *packet;
606 unsigned int len;
607
608 while (true) {
609 flags = 0;
610
611 if (list_empty(&endpoint->txq))
612 break;
613 packet = list_first_entry(&endpoint->txq, struct htc_packet,
614 list);
615
616 ath6kl_dbg(ATH6KL_DBG_HTC,
617 "htc tx got packet 0x%p queue depth %d\n",
618 packet, get_queue_depth(&endpoint->txq));
619
620 len = CALC_TXRX_PADDED_LEN(target,
621 packet->act_len + HTC_HDR_LENGTH);
622
623 if (htc_check_credits(target, endpoint, &flags,
624 packet->endpoint, len, &req_cred))
625 break;
626
627 /* now we can fully move onto caller's queue */
628 packet = list_first_entry(&endpoint->txq, struct htc_packet,
629 list);
630 list_move_tail(&packet->list, queue);
631
632 /* save the number of credits this packet consumed */
633 packet->info.tx.cred_used = req_cred;
634
635 /* all TX packets are handled asynchronously */
636 packet->completion = htc_tx_comp_handler;
637 packet->context = target;
638 endpoint->ep_st.tx_issued += 1;
639
640 /* save send flags */
641 packet->info.tx.flags = flags;
642 packet->info.tx.seqno = endpoint->seqno;
643 endpoint->seqno++;
644 }
645 }
646
647 /* See if the padded tx length falls on a credit boundary */
648 static int htc_get_credit_padding(unsigned int cred_sz, int *len,
649 struct htc_endpoint *ep)
650 {
651 int rem_cred, cred_pad;
652
653 rem_cred = *len % cred_sz;
654
655 /* No padding needed */
656 if (!rem_cred)
657 return 0;
658
659 if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN))
660 return -1;
661
662 /*
663 * The transfer consumes a "partial" credit, this
664 * packet cannot be bundled unless we add
665 * additional "dummy" padding (max 255 bytes) to
666 * consume the entire credit.
667 */
668 cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred;
669
670 if ((cred_pad > 0) && (cred_pad <= 255))
671 *len += cred_pad;
672 else
673 /* The amount of padding is too large, send as non-bundled */
674 return -1;
675
676 return cred_pad;
677 }
678
679 static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target,
680 struct htc_endpoint *endpoint,
681 struct hif_scatter_req *scat_req,
682 int n_scat,
683 struct list_head *queue)
684 {
685 struct htc_packet *packet;
686 int i, len, rem_scat, cred_pad;
687 int status = 0;
688 u8 flags;
689
690 rem_scat = target->max_tx_bndl_sz;
691
692 for (i = 0; i < n_scat; i++) {
693 scat_req->scat_list[i].packet = NULL;
694
695 if (list_empty(queue))
696 break;
697
698 packet = list_first_entry(queue, struct htc_packet, list);
699 len = CALC_TXRX_PADDED_LEN(target,
700 packet->act_len + HTC_HDR_LENGTH);
701
702 cred_pad = htc_get_credit_padding(target->tgt_cred_sz,
703 &len, endpoint);
704 if (cred_pad < 0 || rem_scat < len) {
705 status = -ENOSPC;
706 break;
707 }
708
709 rem_scat -= len;
710 /* now remove it from the queue */
711 list_del(&packet->list);
712
713 scat_req->scat_list[i].packet = packet;
714 /* prepare packet and flag message as part of a send bundle */
715 flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE;
716 ath6kl_htc_tx_prep_pkt(packet, flags,
717 cred_pad, packet->info.tx.seqno);
718 /* Make sure the buffer is 4-byte aligned */
719 ath6kl_htc_tx_buf_align(&packet->buf,
720 packet->act_len + HTC_HDR_LENGTH);
721 scat_req->scat_list[i].buf = packet->buf;
722 scat_req->scat_list[i].len = len;
723
724 scat_req->len += len;
725 scat_req->scat_entries++;
726 ath6kl_dbg(ATH6KL_DBG_HTC,
727 "htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n",
728 i, packet, packet->info.tx.seqno, len, rem_scat);
729 }
730
731 /* Roll back scatter setup in case of any failure */
732 if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) {
733 for (i = scat_req->scat_entries - 1; i >= 0; i--) {
734 packet = scat_req->scat_list[i].packet;
735 if (packet) {
736 packet->buf += HTC_HDR_LENGTH;
737 list_add(&packet->list, queue);
738 }
739 }
740 return -EAGAIN;
741 }
742
743 return status;
744 }
745
746 /*
747 * Drain a queue and send as bundles this function may return without fully
748 * draining the queue when
749 *
750 * 1. scatter resources are exhausted
751 * 2. a message that will consume a partial credit will stop the
752 * bundling process early
753 * 3. we drop below the minimum number of messages for a bundle
754 */
755 static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint,
756 struct list_head *queue,
757 int *sent_bundle, int *n_bundle_pkts)
758 {
759 struct htc_target *target = endpoint->target;
760 struct hif_scatter_req *scat_req = NULL;
761 int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0, i;
762 struct htc_packet *packet;
763 int status;
764 u32 txb_mask;
765 u8 ac = WMM_NUM_AC;
766
767 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
768 (WMI_CONTROL_SVC != endpoint->svc_id))
769 ac = target->dev->ar->ep2ac_map[endpoint->eid];
770
771 while (true) {
772 status = 0;
773 n_scat = get_queue_depth(queue);
774 n_scat = min(n_scat, target->msg_per_bndl_max);
775
776 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE)
777 /* not enough to bundle */
778 break;
779
780 scat_req = hif_scatter_req_get(target->dev->ar);
781
782 if (!scat_req) {
783 /* no scatter resources */
784 ath6kl_dbg(ATH6KL_DBG_HTC,
785 "htc tx no more scatter resources\n");
786 break;
787 }
788
789 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) {
790 if (WMM_AC_BE == ac)
791 /*
792 * BE, BK have priorities and bit
793 * positions reversed
794 */
795 txb_mask = (1 << WMM_AC_BK);
796 else
797 /*
798 * any AC with priority lower than
799 * itself
800 */
801 txb_mask = ((1 << ac) - 1);
802
803 /*
804 * when the scatter request resources drop below a
805 * certain threshold, disable Tx bundling for all
806 * AC's with priority lower than the current requesting
807 * AC. Otherwise re-enable Tx bundling for them
808 */
809 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS)
810 target->tx_bndl_mask &= ~txb_mask;
811 else
812 target->tx_bndl_mask |= txb_mask;
813 }
814
815 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n",
816 n_scat);
817
818 scat_req->len = 0;
819 scat_req->scat_entries = 0;
820
821 status = ath6kl_htc_tx_setup_scat_list(target, endpoint,
822 scat_req, n_scat,
823 queue);
824 if (status == -EAGAIN) {
825 hif_scatter_req_add(target->dev->ar, scat_req);
826 break;
827 }
828
829 /* send path is always asynchronous */
830 scat_req->complete = htc_async_tx_scat_complete;
831 n_sent_bundle++;
832 tot_pkts_bundle += scat_req->scat_entries;
833
834 ath6kl_dbg(ATH6KL_DBG_HTC,
835 "htc tx scatter bytes %d entries %d\n",
836 scat_req->len, scat_req->scat_entries);
837
838 for (i = 0; i < scat_req->scat_entries; i++) {
839 packet = scat_req->scat_list[i].packet;
840 trace_ath6kl_htc_tx(packet->status, packet->endpoint,
841 packet->buf, packet->act_len);
842 }
843
844 ath6kl_hif_submit_scat_req(target->dev, scat_req, false);
845
846 if (status)
847 break;
848 }
849
850 *sent_bundle = n_sent_bundle;
851 *n_bundle_pkts = tot_pkts_bundle;
852 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n",
853 n_sent_bundle);
854
855 return;
856 }
857
858 static void ath6kl_htc_tx_from_queue(struct htc_target *target,
859 struct htc_endpoint *endpoint)
860 {
861 struct list_head txq;
862 struct htc_packet *packet;
863 int bundle_sent;
864 int n_pkts_bundle;
865 u8 ac = WMM_NUM_AC;
866 int status;
867
868 spin_lock_bh(&target->tx_lock);
869
870 endpoint->tx_proc_cnt++;
871 if (endpoint->tx_proc_cnt > 1) {
872 endpoint->tx_proc_cnt--;
873 spin_unlock_bh(&target->tx_lock);
874 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n");
875 return;
876 }
877
878 /*
879 * drain the endpoint TX queue for transmission as long
880 * as we have enough credits.
881 */
882 INIT_LIST_HEAD(&txq);
883
884 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
885 (WMI_CONTROL_SVC != endpoint->svc_id))
886 ac = target->dev->ar->ep2ac_map[endpoint->eid];
887
888 while (true) {
889 if (list_empty(&endpoint->txq))
890 break;
891
892 ath6kl_htc_tx_pkts_get(target, endpoint, &txq);
893
894 if (list_empty(&txq))
895 break;
896
897 spin_unlock_bh(&target->tx_lock);
898
899 bundle_sent = 0;
900 n_pkts_bundle = 0;
901
902 while (true) {
903 /* try to send a bundle on each pass */
904 if ((target->tx_bndl_mask) &&
905 (get_queue_depth(&txq) >=
906 HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
907 int temp1 = 0, temp2 = 0;
908
909 /* check if bundling is enabled for an AC */
910 if (target->tx_bndl_mask & (1 << ac)) {
911 ath6kl_htc_tx_bundle(endpoint, &txq,
912 &temp1, &temp2);
913 bundle_sent += temp1;
914 n_pkts_bundle += temp2;
915 }
916 }
917
918 if (list_empty(&txq))
919 break;
920
921 packet = list_first_entry(&txq, struct htc_packet,
922 list);
923 list_del(&packet->list);
924
925 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags,
926 0, packet->info.tx.seqno);
927 status = ath6kl_htc_tx_issue(target, packet);
928
929 if (status) {
930 packet->status = status;
931 packet->completion(packet->context, packet);
932 }
933 }
934
935 spin_lock_bh(&target->tx_lock);
936
937 endpoint->ep_st.tx_bundles += bundle_sent;
938 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle;
939
940 /*
941 * if an AC has bundling disabled and no tx bundling
942 * has occured continously for a certain number of TX,
943 * enable tx bundling for this AC
944 */
945 if (!bundle_sent) {
946 if (!(target->tx_bndl_mask & (1 << ac)) &&
947 (ac < WMM_NUM_AC)) {
948 if (++target->ac_tx_count[ac] >=
949 TX_RESUME_BUNDLE_THRESHOLD) {
950 target->ac_tx_count[ac] = 0;
951 target->tx_bndl_mask |= (1 << ac);
952 }
953 }
954 } else {
955 /* tx bundling will reset the counter */
956 if (ac < WMM_NUM_AC)
957 target->ac_tx_count[ac] = 0;
958 }
959 }
960
961 endpoint->tx_proc_cnt = 0;
962 spin_unlock_bh(&target->tx_lock);
963 }
964
965 static bool ath6kl_htc_tx_try(struct htc_target *target,
966 struct htc_endpoint *endpoint,
967 struct htc_packet *tx_pkt)
968 {
969 struct htc_ep_callbacks ep_cb;
970 int txq_depth;
971 bool overflow = false;
972
973 ep_cb = endpoint->ep_cb;
974
975 spin_lock_bh(&target->tx_lock);
976 txq_depth = get_queue_depth(&endpoint->txq);
977 spin_unlock_bh(&target->tx_lock);
978
979 if (txq_depth >= endpoint->max_txq_depth)
980 overflow = true;
981
982 if (overflow)
983 ath6kl_dbg(ATH6KL_DBG_HTC,
984 "htc tx overflow ep %d depth %d max %d\n",
985 endpoint->eid, txq_depth,
986 endpoint->max_txq_depth);
987
988 if (overflow && ep_cb.tx_full) {
989 if (ep_cb.tx_full(endpoint->target, tx_pkt) ==
990 HTC_SEND_FULL_DROP) {
991 endpoint->ep_st.tx_dropped += 1;
992 return false;
993 }
994 }
995
996 spin_lock_bh(&target->tx_lock);
997 list_add_tail(&tx_pkt->list, &endpoint->txq);
998 spin_unlock_bh(&target->tx_lock);
999
1000 ath6kl_htc_tx_from_queue(target, endpoint);
1001
1002 return true;
1003 }
1004
1005 static void htc_chk_ep_txq(struct htc_target *target)
1006 {
1007 struct htc_endpoint *endpoint;
1008 struct htc_endpoint_credit_dist *cred_dist;
1009
1010 /*
1011 * Run through the credit distribution list to see if there are
1012 * packets queued. NOTE: no locks need to be taken since the
1013 * distribution list is not dynamic (cannot be re-ordered) and we
1014 * are not modifying any state.
1015 */
1016 list_for_each_entry(cred_dist, &target->cred_dist_list, list) {
1017 endpoint = cred_dist->htc_ep;
1018
1019 spin_lock_bh(&target->tx_lock);
1020 if (!list_empty(&endpoint->txq)) {
1021 ath6kl_dbg(ATH6KL_DBG_HTC,
1022 "htc creds ep %d credits %d pkts %d\n",
1023 cred_dist->endpoint,
1024 endpoint->cred_dist.credits,
1025 get_queue_depth(&endpoint->txq));
1026 spin_unlock_bh(&target->tx_lock);
1027 /*
1028 * Try to start the stalled queue, this list is
1029 * ordered by priority. If there are credits
1030 * available the highest priority queue will get a
1031 * chance to reclaim credits from lower priority
1032 * ones.
1033 */
1034 ath6kl_htc_tx_from_queue(target, endpoint);
1035 spin_lock_bh(&target->tx_lock);
1036 }
1037 spin_unlock_bh(&target->tx_lock);
1038 }
1039 }
1040
1041 static int htc_setup_tx_complete(struct htc_target *target)
1042 {
1043 struct htc_packet *send_pkt = NULL;
1044 int status;
1045
1046 send_pkt = htc_get_control_buf(target, true);
1047
1048 if (!send_pkt)
1049 return -ENOMEM;
1050
1051 if (target->htc_tgt_ver >= HTC_VERSION_2P1) {
1052 struct htc_setup_comp_ext_msg *setup_comp_ext;
1053 u32 flags = 0;
1054
1055 setup_comp_ext =
1056 (struct htc_setup_comp_ext_msg *)send_pkt->buf;
1057 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext));
1058 setup_comp_ext->msg_id =
1059 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID);
1060
1061 if (target->msg_per_bndl_max > 0) {
1062 /* Indicate HTC bundling to the target */
1063 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN;
1064 setup_comp_ext->msg_per_rxbndl =
1065 target->msg_per_bndl_max;
1066 }
1067
1068 memcpy(&setup_comp_ext->flags, &flags,
1069 sizeof(setup_comp_ext->flags));
1070 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext,
1071 sizeof(struct htc_setup_comp_ext_msg),
1072 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1073
1074 } else {
1075 struct htc_setup_comp_msg *setup_comp;
1076 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf;
1077 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg));
1078 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID);
1079 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp,
1080 sizeof(struct htc_setup_comp_msg),
1081 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1082 }
1083
1084 /* we want synchronous operation */
1085 send_pkt->completion = NULL;
1086 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0);
1087 status = ath6kl_htc_tx_issue(target, send_pkt);
1088
1089 if (send_pkt != NULL)
1090 htc_reclaim_txctrl_buf(target, send_pkt);
1091
1092 return status;
1093 }
1094
1095 static void ath6kl_htc_set_credit_dist(struct htc_target *target,
1096 struct ath6kl_htc_credit_info *credit_info,
1097 u16 srvc_pri_order[], int list_len)
1098 {
1099 struct htc_endpoint *endpoint;
1100 int i, ep;
1101
1102 target->credit_info = credit_info;
1103
1104 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list,
1105 &target->cred_dist_list);
1106
1107 for (i = 0; i < list_len; i++) {
1108 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) {
1109 endpoint = &target->endpoint[ep];
1110 if (endpoint->svc_id == srvc_pri_order[i]) {
1111 list_add_tail(&endpoint->cred_dist.list,
1112 &target->cred_dist_list);
1113 break;
1114 }
1115 }
1116 if (ep >= ENDPOINT_MAX) {
1117 WARN_ON(1);
1118 return;
1119 }
1120 }
1121 }
1122
1123 static int ath6kl_htc_mbox_tx(struct htc_target *target,
1124 struct htc_packet *packet)
1125 {
1126 struct htc_endpoint *endpoint;
1127 struct list_head queue;
1128
1129 ath6kl_dbg(ATH6KL_DBG_HTC,
1130 "htc tx ep id %d buf 0x%p len %d\n",
1131 packet->endpoint, packet->buf, packet->act_len);
1132
1133 if (packet->endpoint >= ENDPOINT_MAX) {
1134 WARN_ON(1);
1135 return -EINVAL;
1136 }
1137
1138 endpoint = &target->endpoint[packet->endpoint];
1139
1140 if (!ath6kl_htc_tx_try(target, endpoint, packet)) {
1141 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ?
1142 -ECANCELED : -ENOSPC;
1143 INIT_LIST_HEAD(&queue);
1144 list_add(&packet->list, &queue);
1145 htc_tx_complete(endpoint, &queue);
1146 }
1147
1148 return 0;
1149 }
1150
1151 /* flush endpoint TX queue */
1152 static void ath6kl_htc_mbox_flush_txep(struct htc_target *target,
1153 enum htc_endpoint_id eid, u16 tag)
1154 {
1155 struct htc_packet *packet, *tmp_pkt;
1156 struct list_head discard_q, container;
1157 struct htc_endpoint *endpoint = &target->endpoint[eid];
1158
1159 if (!endpoint->svc_id) {
1160 WARN_ON(1);
1161 return;
1162 }
1163
1164 /* initialize the discard queue */
1165 INIT_LIST_HEAD(&discard_q);
1166
1167 spin_lock_bh(&target->tx_lock);
1168
1169 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) {
1170 if ((tag == HTC_TX_PACKET_TAG_ALL) ||
1171 (tag == packet->info.tx.tag))
1172 list_move_tail(&packet->list, &discard_q);
1173 }
1174
1175 spin_unlock_bh(&target->tx_lock);
1176
1177 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) {
1178 packet->status = -ECANCELED;
1179 list_del(&packet->list);
1180 ath6kl_dbg(ATH6KL_DBG_HTC,
1181 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n",
1182 packet, packet->act_len,
1183 packet->endpoint, packet->info.tx.tag);
1184
1185 INIT_LIST_HEAD(&container);
1186 list_add_tail(&packet->list, &container);
1187 htc_tx_complete(endpoint, &container);
1188 }
1189 }
1190
1191 static void ath6kl_htc_flush_txep_all(struct htc_target *target)
1192 {
1193 struct htc_endpoint *endpoint;
1194 int i;
1195
1196 dump_cred_dist_stats(target);
1197
1198 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
1199 endpoint = &target->endpoint[i];
1200 if (endpoint->svc_id == 0)
1201 /* not in use.. */
1202 continue;
1203 ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL);
1204 }
1205 }
1206
1207 static void ath6kl_htc_mbox_activity_changed(struct htc_target *target,
1208 enum htc_endpoint_id eid,
1209 bool active)
1210 {
1211 struct htc_endpoint *endpoint = &target->endpoint[eid];
1212 bool dist = false;
1213
1214 if (endpoint->svc_id == 0) {
1215 WARN_ON(1);
1216 return;
1217 }
1218
1219 spin_lock_bh(&target->tx_lock);
1220
1221 if (active) {
1222 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) {
1223 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE;
1224 dist = true;
1225 }
1226 } else {
1227 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) {
1228 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE;
1229 dist = true;
1230 }
1231 }
1232
1233 if (dist) {
1234 endpoint->cred_dist.txq_depth =
1235 get_queue_depth(&endpoint->txq);
1236
1237 ath6kl_dbg(ATH6KL_DBG_HTC,
1238 "htc tx activity ctxt 0x%p dist 0x%p\n",
1239 target->credit_info, &target->cred_dist_list);
1240
1241 ath6kl_credit_distribute(target->credit_info,
1242 &target->cred_dist_list,
1243 HTC_CREDIT_DIST_ACTIVITY_CHANGE);
1244 }
1245
1246 spin_unlock_bh(&target->tx_lock);
1247
1248 if (dist && !active)
1249 htc_chk_ep_txq(target);
1250 }
1251
1252 /* HTC Rx */
1253
1254 static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint,
1255 int n_look_ahds)
1256 {
1257 endpoint->ep_st.rx_pkts++;
1258 if (n_look_ahds == 1)
1259 endpoint->ep_st.rx_lkahds++;
1260 else if (n_look_ahds > 1)
1261 endpoint->ep_st.rx_bundle_lkahd++;
1262 }
1263
1264 static inline bool htc_valid_rx_frame_len(struct htc_target *target,
1265 enum htc_endpoint_id eid, int len)
1266 {
1267 return (eid == target->dev->ar->ctrl_ep) ?
1268 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE;
1269 }
1270
1271 static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet)
1272 {
1273 struct list_head queue;
1274
1275 INIT_LIST_HEAD(&queue);
1276 list_add_tail(&packet->list, &queue);
1277 return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue);
1278 }
1279
1280 static void htc_reclaim_rxbuf(struct htc_target *target,
1281 struct htc_packet *packet,
1282 struct htc_endpoint *ep)
1283 {
1284 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) {
1285 htc_rxpkt_reset(packet);
1286 packet->status = -ECANCELED;
1287 ep->ep_cb.rx(ep->target, packet);
1288 } else {
1289 htc_rxpkt_reset(packet);
1290 htc_add_rxbuf((void *)(target), packet);
1291 }
1292 }
1293
1294 static void reclaim_rx_ctrl_buf(struct htc_target *target,
1295 struct htc_packet *packet)
1296 {
1297 spin_lock_bh(&target->htc_lock);
1298 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
1299 spin_unlock_bh(&target->htc_lock);
1300 }
1301
1302 static int ath6kl_htc_rx_packet(struct htc_target *target,
1303 struct htc_packet *packet,
1304 u32 rx_len)
1305 {
1306 struct ath6kl_device *dev = target->dev;
1307 u32 padded_len;
1308 int status;
1309
1310 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len);
1311
1312 if (padded_len > packet->buf_len) {
1313 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n",
1314 padded_len, rx_len, packet->buf_len);
1315 return -ENOMEM;
1316 }
1317
1318 ath6kl_dbg(ATH6KL_DBG_HTC,
1319 "htc rx 0x%p hdr 0x%x len %d mbox 0x%x\n",
1320 packet, packet->info.rx.exp_hdr,
1321 padded_len, dev->ar->mbox_info.htc_addr);
1322
1323 status = hif_read_write_sync(dev->ar,
1324 dev->ar->mbox_info.htc_addr,
1325 packet->buf, padded_len,
1326 HIF_RD_SYNC_BLOCK_FIX);
1327
1328 packet->status = status;
1329
1330 return status;
1331 }
1332
1333 /*
1334 * optimization for recv packets, we can indicate a
1335 * "hint" that there are more single-packets to fetch
1336 * on this endpoint.
1337 */
1338 static void ath6kl_htc_rx_set_indicate(u32 lk_ahd,
1339 struct htc_endpoint *endpoint,
1340 struct htc_packet *packet)
1341 {
1342 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd;
1343
1344 if (htc_hdr->eid == packet->endpoint) {
1345 if (!list_empty(&endpoint->rx_bufq))
1346 packet->info.rx.indicat_flags |=
1347 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
1348 }
1349 }
1350
1351 static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint)
1352 {
1353 struct htc_ep_callbacks ep_cb = endpoint->ep_cb;
1354
1355 if (ep_cb.rx_refill_thresh > 0) {
1356 spin_lock_bh(&endpoint->target->rx_lock);
1357 if (get_queue_depth(&endpoint->rx_bufq)
1358 < ep_cb.rx_refill_thresh) {
1359 spin_unlock_bh(&endpoint->target->rx_lock);
1360 ep_cb.rx_refill(endpoint->target, endpoint->eid);
1361 return;
1362 }
1363 spin_unlock_bh(&endpoint->target->rx_lock);
1364 }
1365 }
1366
1367 /* This function is called with rx_lock held */
1368 static int ath6kl_htc_rx_setup(struct htc_target *target,
1369 struct htc_endpoint *ep,
1370 u32 *lk_ahds, struct list_head *queue, int n_msg)
1371 {
1372 struct htc_packet *packet;
1373 /* FIXME: type of lk_ahds can't be right */
1374 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds;
1375 struct htc_ep_callbacks ep_cb;
1376 int status = 0, j, full_len;
1377 bool no_recycle;
1378
1379 full_len = CALC_TXRX_PADDED_LEN(target,
1380 le16_to_cpu(htc_hdr->payld_len) +
1381 sizeof(*htc_hdr));
1382
1383 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) {
1384 ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n",
1385 htc_hdr->eid, htc_hdr->flags,
1386 le16_to_cpu(htc_hdr->payld_len));
1387 return -EINVAL;
1388 }
1389
1390 ep_cb = ep->ep_cb;
1391 for (j = 0; j < n_msg; j++) {
1392 /*
1393 * Reset flag, any packets allocated using the
1394 * rx_alloc() API cannot be recycled on
1395 * cleanup,they must be explicitly returned.
1396 */
1397 no_recycle = false;
1398
1399 if (ep_cb.rx_allocthresh &&
1400 (full_len > ep_cb.rx_alloc_thresh)) {
1401 ep->ep_st.rx_alloc_thresh_hit += 1;
1402 ep->ep_st.rxalloc_thresh_byte +=
1403 le16_to_cpu(htc_hdr->payld_len);
1404
1405 spin_unlock_bh(&target->rx_lock);
1406 no_recycle = true;
1407
1408 packet = ep_cb.rx_allocthresh(ep->target, ep->eid,
1409 full_len);
1410 spin_lock_bh(&target->rx_lock);
1411 } else {
1412 /* refill handler is being used */
1413 if (list_empty(&ep->rx_bufq)) {
1414 if (ep_cb.rx_refill) {
1415 spin_unlock_bh(&target->rx_lock);
1416 ep_cb.rx_refill(ep->target, ep->eid);
1417 spin_lock_bh(&target->rx_lock);
1418 }
1419 }
1420
1421 if (list_empty(&ep->rx_bufq)) {
1422 packet = NULL;
1423 } else {
1424 packet = list_first_entry(&ep->rx_bufq,
1425 struct htc_packet, list);
1426 list_del(&packet->list);
1427 }
1428 }
1429
1430 if (!packet) {
1431 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS;
1432 target->ep_waiting = ep->eid;
1433 return -ENOSPC;
1434 }
1435
1436 /* clear flags */
1437 packet->info.rx.rx_flags = 0;
1438 packet->info.rx.indicat_flags = 0;
1439 packet->status = 0;
1440
1441 if (no_recycle)
1442 /*
1443 * flag that these packets cannot be
1444 * recycled, they have to be returned to
1445 * the user
1446 */
1447 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE;
1448
1449 /* Caller needs to free this upon any failure */
1450 list_add_tail(&packet->list, queue);
1451
1452 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
1453 status = -ECANCELED;
1454 break;
1455 }
1456
1457 if (j) {
1458 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR;
1459 packet->info.rx.exp_hdr = 0xFFFFFFFF;
1460 } else
1461 /* set expected look ahead */
1462 packet->info.rx.exp_hdr = *lk_ahds;
1463
1464 packet->act_len = le16_to_cpu(htc_hdr->payld_len) +
1465 HTC_HDR_LENGTH;
1466 }
1467
1468 return status;
1469 }
1470
1471 static int ath6kl_htc_rx_alloc(struct htc_target *target,
1472 u32 lk_ahds[], int msg,
1473 struct htc_endpoint *endpoint,
1474 struct list_head *queue)
1475 {
1476 int status = 0;
1477 struct htc_packet *packet, *tmp_pkt;
1478 struct htc_frame_hdr *htc_hdr;
1479 int i, n_msg;
1480
1481 spin_lock_bh(&target->rx_lock);
1482
1483 for (i = 0; i < msg; i++) {
1484 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i];
1485
1486 if (htc_hdr->eid >= ENDPOINT_MAX) {
1487 ath6kl_err("invalid ep in look-ahead: %d\n",
1488 htc_hdr->eid);
1489 status = -ENOMEM;
1490 break;
1491 }
1492
1493 if (htc_hdr->eid != endpoint->eid) {
1494 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n",
1495 htc_hdr->eid, endpoint->eid, i);
1496 status = -ENOMEM;
1497 break;
1498 }
1499
1500 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) {
1501 ath6kl_err("payload len %d exceeds max htc : %d !\n",
1502 htc_hdr->payld_len,
1503 (u32) HTC_MAX_PAYLOAD_LENGTH);
1504 status = -ENOMEM;
1505 break;
1506 }
1507
1508 if (endpoint->svc_id == 0) {
1509 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid);
1510 status = -ENOMEM;
1511 break;
1512 }
1513
1514 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) {
1515 /*
1516 * HTC header indicates that every packet to follow
1517 * has the same padded length so that it can be
1518 * optimally fetched as a full bundle.
1519 */
1520 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >>
1521 HTC_FLG_RX_BNDL_CNT_S;
1522
1523 /* the count doesn't include the starter frame */
1524 n_msg++;
1525 if (n_msg > target->msg_per_bndl_max) {
1526 status = -ENOMEM;
1527 break;
1528 }
1529
1530 endpoint->ep_st.rx_bundle_from_hdr += 1;
1531 ath6kl_dbg(ATH6KL_DBG_HTC,
1532 "htc rx bundle pkts %d\n",
1533 n_msg);
1534 } else
1535 /* HTC header only indicates 1 message to fetch */
1536 n_msg = 1;
1537
1538 /* Setup packet buffers for each message */
1539 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i],
1540 queue, n_msg);
1541
1542 /*
1543 * This is due to unavailabilty of buffers to rx entire data.
1544 * Return no error so that free buffers from queue can be used
1545 * to receive partial data.
1546 */
1547 if (status == -ENOSPC) {
1548 spin_unlock_bh(&target->rx_lock);
1549 return 0;
1550 }
1551
1552 if (status)
1553 break;
1554 }
1555
1556 spin_unlock_bh(&target->rx_lock);
1557
1558 if (status) {
1559 list_for_each_entry_safe(packet, tmp_pkt, queue, list) {
1560 list_del(&packet->list);
1561 htc_reclaim_rxbuf(target, packet,
1562 &target->endpoint[packet->endpoint]);
1563 }
1564 }
1565
1566 return status;
1567 }
1568
1569 static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets)
1570 {
1571 if (packets->endpoint != ENDPOINT_0) {
1572 WARN_ON(1);
1573 return;
1574 }
1575
1576 if (packets->status == -ECANCELED) {
1577 reclaim_rx_ctrl_buf(context, packets);
1578 return;
1579 }
1580
1581 if (packets->act_len > 0) {
1582 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n",
1583 packets->act_len + HTC_HDR_LENGTH);
1584
1585 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1586 "htc rx unexpected endpoint 0 message", "",
1587 packets->buf - HTC_HDR_LENGTH,
1588 packets->act_len + HTC_HDR_LENGTH);
1589 }
1590
1591 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]);
1592 }
1593
1594 static void htc_proc_cred_rpt(struct htc_target *target,
1595 struct htc_credit_report *rpt,
1596 int n_entries,
1597 enum htc_endpoint_id from_ep)
1598 {
1599 struct htc_endpoint *endpoint;
1600 int tot_credits = 0, i;
1601 bool dist = false;
1602
1603 spin_lock_bh(&target->tx_lock);
1604
1605 for (i = 0; i < n_entries; i++, rpt++) {
1606 if (rpt->eid >= ENDPOINT_MAX) {
1607 WARN_ON(1);
1608 spin_unlock_bh(&target->tx_lock);
1609 return;
1610 }
1611
1612 endpoint = &target->endpoint[rpt->eid];
1613
1614 ath6kl_dbg(ATH6KL_DBG_CREDIT,
1615 "credit report ep %d credits %d\n",
1616 rpt->eid, rpt->credits);
1617
1618 endpoint->ep_st.tx_cred_rpt += 1;
1619 endpoint->ep_st.cred_retnd += rpt->credits;
1620
1621 if (from_ep == rpt->eid) {
1622 /*
1623 * This credit report arrived on the same endpoint
1624 * indicating it arrived in an RX packet.
1625 */
1626 endpoint->ep_st.cred_from_rx += rpt->credits;
1627 endpoint->ep_st.cred_rpt_from_rx += 1;
1628 } else if (from_ep == ENDPOINT_0) {
1629 /* credit arrived on endpoint 0 as a NULL message */
1630 endpoint->ep_st.cred_from_ep0 += rpt->credits;
1631 endpoint->ep_st.cred_rpt_ep0 += 1;
1632 } else {
1633 endpoint->ep_st.cred_from_other += rpt->credits;
1634 endpoint->ep_st.cred_rpt_from_other += 1;
1635 }
1636
1637 if (rpt->eid == ENDPOINT_0)
1638 /* always give endpoint 0 credits back */
1639 endpoint->cred_dist.credits += rpt->credits;
1640 else {
1641 endpoint->cred_dist.cred_to_dist += rpt->credits;
1642 dist = true;
1643 }
1644
1645 /*
1646 * Refresh tx depth for distribution function that will
1647 * recover these credits NOTE: this is only valid when
1648 * there are credits to recover!
1649 */
1650 endpoint->cred_dist.txq_depth =
1651 get_queue_depth(&endpoint->txq);
1652
1653 tot_credits += rpt->credits;
1654 }
1655
1656 if (dist) {
1657 /*
1658 * This was a credit return based on a completed send
1659 * operations note, this is done with the lock held
1660 */
1661 ath6kl_credit_distribute(target->credit_info,
1662 &target->cred_dist_list,
1663 HTC_CREDIT_DIST_SEND_COMPLETE);
1664 }
1665
1666 spin_unlock_bh(&target->tx_lock);
1667
1668 if (tot_credits)
1669 htc_chk_ep_txq(target);
1670 }
1671
1672 static int htc_parse_trailer(struct htc_target *target,
1673 struct htc_record_hdr *record,
1674 u8 *record_buf, u32 *next_lk_ahds,
1675 enum htc_endpoint_id endpoint,
1676 int *n_lk_ahds)
1677 {
1678 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt;
1679 struct htc_lookahead_report *lk_ahd;
1680 int len;
1681
1682 switch (record->rec_id) {
1683 case HTC_RECORD_CREDITS:
1684 len = record->len / sizeof(struct htc_credit_report);
1685 if (!len) {
1686 WARN_ON(1);
1687 return -EINVAL;
1688 }
1689
1690 htc_proc_cred_rpt(target,
1691 (struct htc_credit_report *) record_buf,
1692 len, endpoint);
1693 break;
1694 case HTC_RECORD_LOOKAHEAD:
1695 len = record->len / sizeof(*lk_ahd);
1696 if (!len) {
1697 WARN_ON(1);
1698 return -EINVAL;
1699 }
1700
1701 lk_ahd = (struct htc_lookahead_report *) record_buf;
1702 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) &&
1703 next_lk_ahds) {
1704 ath6kl_dbg(ATH6KL_DBG_HTC,
1705 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n",
1706 lk_ahd->pre_valid, lk_ahd->post_valid);
1707
1708 /* look ahead bytes are valid, copy them over */
1709 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4);
1710
1711 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1712 "htc rx next look ahead",
1713 "", next_lk_ahds, 4);
1714
1715 *n_lk_ahds = 1;
1716 }
1717 break;
1718 case HTC_RECORD_LOOKAHEAD_BUNDLE:
1719 len = record->len / sizeof(*bundle_lkahd_rpt);
1720 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) {
1721 WARN_ON(1);
1722 return -EINVAL;
1723 }
1724
1725 if (next_lk_ahds) {
1726 int i;
1727
1728 bundle_lkahd_rpt =
1729 (struct htc_bundle_lkahd_rpt *) record_buf;
1730
1731 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd",
1732 "", record_buf, record->len);
1733
1734 for (i = 0; i < len; i++) {
1735 memcpy((u8 *)&next_lk_ahds[i],
1736 bundle_lkahd_rpt->lk_ahd, 4);
1737 bundle_lkahd_rpt++;
1738 }
1739
1740 *n_lk_ahds = i;
1741 }
1742 break;
1743 default:
1744 ath6kl_err("unhandled record: id:%d len:%d\n",
1745 record->rec_id, record->len);
1746 break;
1747 }
1748
1749 return 0;
1750 }
1751
1752 static int htc_proc_trailer(struct htc_target *target,
1753 u8 *buf, int len, u32 *next_lk_ahds,
1754 int *n_lk_ahds, enum htc_endpoint_id endpoint)
1755 {
1756 struct htc_record_hdr *record;
1757 int orig_len;
1758 int status;
1759 u8 *record_buf;
1760 u8 *orig_buf;
1761
1762 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len);
1763 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len);
1764
1765 orig_buf = buf;
1766 orig_len = len;
1767 status = 0;
1768
1769 while (len > 0) {
1770 if (len < sizeof(struct htc_record_hdr)) {
1771 status = -ENOMEM;
1772 break;
1773 }
1774 /* these are byte aligned structs */
1775 record = (struct htc_record_hdr *) buf;
1776 len -= sizeof(struct htc_record_hdr);
1777 buf += sizeof(struct htc_record_hdr);
1778
1779 if (record->len > len) {
1780 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n",
1781 record->len, record->rec_id, len);
1782 status = -ENOMEM;
1783 break;
1784 }
1785 record_buf = buf;
1786
1787 status = htc_parse_trailer(target, record, record_buf,
1788 next_lk_ahds, endpoint, n_lk_ahds);
1789
1790 if (status)
1791 break;
1792
1793 /* advance buffer past this record for next time around */
1794 buf += record->len;
1795 len -= record->len;
1796 }
1797
1798 if (status)
1799 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer",
1800 "", orig_buf, orig_len);
1801
1802 return status;
1803 }
1804
1805 static int ath6kl_htc_rx_process_hdr(struct htc_target *target,
1806 struct htc_packet *packet,
1807 u32 *next_lkahds, int *n_lkahds)
1808 {
1809 int status = 0;
1810 u16 payload_len;
1811 u32 lk_ahd;
1812 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf;
1813
1814 if (n_lkahds != NULL)
1815 *n_lkahds = 0;
1816
1817 /*
1818 * NOTE: we cannot assume the alignment of buf, so we use the safe
1819 * macros to retrieve 16 bit fields.
1820 */
1821 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len));
1822
1823 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd));
1824
1825 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) {
1826 /*
1827 * Refresh the expected header and the actual length as it
1828 * was unknown when this packet was grabbed as part of the
1829 * bundle.
1830 */
1831 packet->info.rx.exp_hdr = lk_ahd;
1832 packet->act_len = payload_len + HTC_HDR_LENGTH;
1833
1834 /* validate the actual header that was refreshed */
1835 if (packet->act_len > packet->buf_len) {
1836 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n",
1837 payload_len, lk_ahd);
1838 /*
1839 * Limit this to max buffer just to print out some
1840 * of the buffer.
1841 */
1842 packet->act_len = min(packet->act_len, packet->buf_len);
1843 status = -ENOMEM;
1844 goto fail_rx;
1845 }
1846
1847 if (packet->endpoint != htc_hdr->eid) {
1848 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n",
1849 htc_hdr->eid, packet->endpoint);
1850 status = -ENOMEM;
1851 goto fail_rx;
1852 }
1853 }
1854
1855 if (lk_ahd != packet->info.rx.exp_hdr) {
1856 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n",
1857 __func__, packet, packet->info.rx.rx_flags);
1858 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd",
1859 "", &packet->info.rx.exp_hdr, 4);
1860 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header",
1861 "", (u8 *)&lk_ahd, sizeof(lk_ahd));
1862 status = -ENOMEM;
1863 goto fail_rx;
1864 }
1865
1866 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) {
1867 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) ||
1868 htc_hdr->ctrl[0] > payload_len) {
1869 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n",
1870 __func__, payload_len, htc_hdr->ctrl[0]);
1871 status = -ENOMEM;
1872 goto fail_rx;
1873 }
1874
1875 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) {
1876 next_lkahds = NULL;
1877 n_lkahds = NULL;
1878 }
1879
1880 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH
1881 + payload_len - htc_hdr->ctrl[0],
1882 htc_hdr->ctrl[0], next_lkahds,
1883 n_lkahds, packet->endpoint);
1884
1885 if (status)
1886 goto fail_rx;
1887
1888 packet->act_len -= htc_hdr->ctrl[0];
1889 }
1890
1891 packet->buf += HTC_HDR_LENGTH;
1892 packet->act_len -= HTC_HDR_LENGTH;
1893
1894 fail_rx:
1895 if (status)
1896 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet",
1897 "", packet->buf, packet->act_len);
1898
1899 return status;
1900 }
1901
1902 static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint,
1903 struct htc_packet *packet)
1904 {
1905 ath6kl_dbg(ATH6KL_DBG_HTC,
1906 "htc rx complete ep %d packet 0x%p\n",
1907 endpoint->eid, packet);
1908
1909 endpoint->ep_cb.rx(endpoint->target, packet);
1910 }
1911
1912 static int ath6kl_htc_rx_bundle(struct htc_target *target,
1913 struct list_head *rxq,
1914 struct list_head *sync_compq,
1915 int *n_pkt_fetched, bool part_bundle)
1916 {
1917 struct hif_scatter_req *scat_req;
1918 struct htc_packet *packet;
1919 int rem_space = target->max_rx_bndl_sz;
1920 int n_scat_pkt, status = 0, i, len;
1921
1922 n_scat_pkt = get_queue_depth(rxq);
1923 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max);
1924
1925 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) {
1926 /*
1927 * We were forced to split this bundle receive operation
1928 * all packets in this partial bundle must have their
1929 * lookaheads ignored.
1930 */
1931 part_bundle = true;
1932
1933 /*
1934 * This would only happen if the target ignored our max
1935 * bundle limit.
1936 */
1937 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n",
1938 __func__, get_queue_depth(rxq), n_scat_pkt);
1939 }
1940
1941 len = 0;
1942
1943 ath6kl_dbg(ATH6KL_DBG_HTC,
1944 "htc rx bundle depth %d pkts %d\n",
1945 get_queue_depth(rxq), n_scat_pkt);
1946
1947 scat_req = hif_scatter_req_get(target->dev->ar);
1948
1949 if (scat_req == NULL)
1950 goto fail_rx_pkt;
1951
1952 for (i = 0; i < n_scat_pkt; i++) {
1953 int pad_len;
1954
1955 packet = list_first_entry(rxq, struct htc_packet, list);
1956 list_del(&packet->list);
1957
1958 pad_len = CALC_TXRX_PADDED_LEN(target,
1959 packet->act_len);
1960
1961 if ((rem_space - pad_len) < 0) {
1962 list_add(&packet->list, rxq);
1963 break;
1964 }
1965
1966 rem_space -= pad_len;
1967
1968 if (part_bundle || (i < (n_scat_pkt - 1)))
1969 /*
1970 * Packet 0..n-1 cannot be checked for look-aheads
1971 * since we are fetching a bundle the last packet
1972 * however can have it's lookahead used
1973 */
1974 packet->info.rx.rx_flags |=
1975 HTC_RX_PKT_IGNORE_LOOKAHEAD;
1976
1977 /* NOTE: 1 HTC packet per scatter entry */
1978 scat_req->scat_list[i].buf = packet->buf;
1979 scat_req->scat_list[i].len = pad_len;
1980
1981 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE;
1982
1983 list_add_tail(&packet->list, sync_compq);
1984
1985 WARN_ON(!scat_req->scat_list[i].len);
1986 len += scat_req->scat_list[i].len;
1987 }
1988
1989 scat_req->len = len;
1990 scat_req->scat_entries = i;
1991
1992 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true);
1993
1994 if (!status)
1995 *n_pkt_fetched = i;
1996
1997 /* free scatter request */
1998 hif_scatter_req_add(target->dev->ar, scat_req);
1999
2000 fail_rx_pkt:
2001
2002 return status;
2003 }
2004
2005 static int ath6kl_htc_rx_process_packets(struct htc_target *target,
2006 struct list_head *comp_pktq,
2007 u32 lk_ahds[],
2008 int *n_lk_ahd)
2009 {
2010 struct htc_packet *packet, *tmp_pkt;
2011 struct htc_endpoint *ep;
2012 int status = 0;
2013
2014 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) {
2015 ep = &target->endpoint[packet->endpoint];
2016
2017 trace_ath6kl_htc_rx(packet->status, packet->endpoint,
2018 packet->buf, packet->act_len);
2019
2020 /* process header for each of the recv packet */
2021 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds,
2022 n_lk_ahd);
2023 if (status)
2024 return status;
2025
2026 list_del(&packet->list);
2027
2028 if (list_empty(comp_pktq)) {
2029 /*
2030 * Last packet's more packet flag is set
2031 * based on the lookahead.
2032 */
2033 if (*n_lk_ahd > 0)
2034 ath6kl_htc_rx_set_indicate(lk_ahds[0],
2035 ep, packet);
2036 } else
2037 /*
2038 * Packets in a bundle automatically have
2039 * this flag set.
2040 */
2041 packet->info.rx.indicat_flags |=
2042 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
2043
2044 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd);
2045
2046 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE)
2047 ep->ep_st.rx_bundl += 1;
2048
2049 ath6kl_htc_rx_complete(ep, packet);
2050 }
2051
2052 return status;
2053 }
2054
2055 static int ath6kl_htc_rx_fetch(struct htc_target *target,
2056 struct list_head *rx_pktq,
2057 struct list_head *comp_pktq)
2058 {
2059 int fetched_pkts;
2060 bool part_bundle = false;
2061 int status = 0;
2062 struct list_head tmp_rxq;
2063 struct htc_packet *packet, *tmp_pkt;
2064
2065 /* now go fetch the list of HTC packets */
2066 while (!list_empty(rx_pktq)) {
2067 fetched_pkts = 0;
2068
2069 INIT_LIST_HEAD(&tmp_rxq);
2070
2071 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) {
2072 /*
2073 * There are enough packets to attempt a
2074 * bundle transfer and recv bundling is
2075 * allowed.
2076 */
2077 status = ath6kl_htc_rx_bundle(target, rx_pktq,
2078 &tmp_rxq,
2079 &fetched_pkts,
2080 part_bundle);
2081 if (status)
2082 goto fail_rx;
2083
2084 if (!list_empty(rx_pktq))
2085 part_bundle = true;
2086
2087 list_splice_tail_init(&tmp_rxq, comp_pktq);
2088 }
2089
2090 if (!fetched_pkts) {
2091 packet = list_first_entry(rx_pktq, struct htc_packet,
2092 list);
2093
2094 /* fully synchronous */
2095 packet->completion = NULL;
2096
2097 if (!list_is_singular(rx_pktq))
2098 /*
2099 * look_aheads in all packet
2100 * except the last one in the
2101 * bundle must be ignored
2102 */
2103 packet->info.rx.rx_flags |=
2104 HTC_RX_PKT_IGNORE_LOOKAHEAD;
2105
2106 /* go fetch the packet */
2107 status = ath6kl_htc_rx_packet(target, packet,
2108 packet->act_len);
2109
2110 list_move_tail(&packet->list, &tmp_rxq);
2111
2112 if (status)
2113 goto fail_rx;
2114
2115 list_splice_tail_init(&tmp_rxq, comp_pktq);
2116 }
2117 }
2118
2119 return 0;
2120
2121 fail_rx:
2122
2123 /*
2124 * Cleanup any packets we allocated but didn't use to
2125 * actually fetch any packets.
2126 */
2127
2128 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) {
2129 list_del(&packet->list);
2130 htc_reclaim_rxbuf(target, packet,
2131 &target->endpoint[packet->endpoint]);
2132 }
2133
2134 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) {
2135 list_del(&packet->list);
2136 htc_reclaim_rxbuf(target, packet,
2137 &target->endpoint[packet->endpoint]);
2138 }
2139
2140 return status;
2141 }
2142
2143 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
2144 u32 msg_look_ahead, int *num_pkts)
2145 {
2146 struct htc_packet *packets, *tmp_pkt;
2147 struct htc_endpoint *endpoint;
2148 struct list_head rx_pktq, comp_pktq;
2149 int status = 0;
2150 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE];
2151 int num_look_ahead = 1;
2152 enum htc_endpoint_id id;
2153 int n_fetched = 0;
2154
2155 INIT_LIST_HEAD(&comp_pktq);
2156 *num_pkts = 0;
2157
2158 /*
2159 * On first entry copy the look_aheads into our temp array for
2160 * processing
2161 */
2162 look_aheads[0] = msg_look_ahead;
2163
2164 while (true) {
2165 /*
2166 * First lookahead sets the expected endpoint IDs for all
2167 * packets in a bundle.
2168 */
2169 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid;
2170 endpoint = &target->endpoint[id];
2171
2172 if (id >= ENDPOINT_MAX) {
2173 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n",
2174 id);
2175 status = -ENOMEM;
2176 break;
2177 }
2178
2179 INIT_LIST_HEAD(&rx_pktq);
2180 INIT_LIST_HEAD(&comp_pktq);
2181
2182 /*
2183 * Try to allocate as many HTC RX packets indicated by the
2184 * look_aheads.
2185 */
2186 status = ath6kl_htc_rx_alloc(target, look_aheads,
2187 num_look_ahead, endpoint,
2188 &rx_pktq);
2189 if (status)
2190 break;
2191
2192 if (get_queue_depth(&rx_pktq) >= 2)
2193 /*
2194 * A recv bundle was detected, force IRQ status
2195 * re-check again
2196 */
2197 target->chk_irq_status_cnt = 1;
2198
2199 n_fetched += get_queue_depth(&rx_pktq);
2200
2201 num_look_ahead = 0;
2202
2203 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq);
2204
2205 if (!status)
2206 ath6kl_htc_rx_chk_water_mark(endpoint);
2207
2208 /* Process fetched packets */
2209 status = ath6kl_htc_rx_process_packets(target, &comp_pktq,
2210 look_aheads,
2211 &num_look_ahead);
2212
2213 if (!num_look_ahead || status)
2214 break;
2215
2216 /*
2217 * For SYNCH processing, if we get here, we are running
2218 * through the loop again due to a detected lookahead. Set
2219 * flag that we should re-check IRQ status registers again
2220 * before leaving IRQ processing, this can net better
2221 * performance in high throughput situations.
2222 */
2223 target->chk_irq_status_cnt = 1;
2224 }
2225
2226 if (status) {
2227 ath6kl_err("failed to get pending recv messages: %d\n",
2228 status);
2229
2230 /* cleanup any packets in sync completion queue */
2231 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) {
2232 list_del(&packets->list);
2233 htc_reclaim_rxbuf(target, packets,
2234 &target->endpoint[packets->endpoint]);
2235 }
2236
2237 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2238 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n");
2239 ath6kl_hif_rx_control(target->dev, false);
2240 }
2241 }
2242
2243 /*
2244 * Before leaving, check to see if host ran out of buffers and
2245 * needs to stop the receiver.
2246 */
2247 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2248 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n");
2249 ath6kl_hif_rx_control(target->dev, false);
2250 }
2251 *num_pkts = n_fetched;
2252
2253 return status;
2254 }
2255
2256 /*
2257 * Synchronously wait for a control message from the target,
2258 * This function is used at initialization time ONLY. At init messages
2259 * on ENDPOINT 0 are expected.
2260 */
2261 static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target)
2262 {
2263 struct htc_packet *packet = NULL;
2264 struct htc_frame_hdr *htc_hdr;
2265 u32 look_ahead;
2266
2267 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead,
2268 HTC_TARGET_RESPONSE_TIMEOUT))
2269 return NULL;
2270
2271 ath6kl_dbg(ATH6KL_DBG_HTC,
2272 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead);
2273
2274 htc_hdr = (struct htc_frame_hdr *)&look_ahead;
2275
2276 if (htc_hdr->eid != ENDPOINT_0)
2277 return NULL;
2278
2279 packet = htc_get_control_buf(target, false);
2280
2281 if (!packet)
2282 return NULL;
2283
2284 packet->info.rx.rx_flags = 0;
2285 packet->info.rx.exp_hdr = look_ahead;
2286 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH;
2287
2288 if (packet->act_len > packet->buf_len)
2289 goto fail_ctrl_rx;
2290
2291 /* we want synchronous operation */
2292 packet->completion = NULL;
2293
2294 /* get the message from the device, this will block */
2295 if (ath6kl_htc_rx_packet(target, packet, packet->act_len))
2296 goto fail_ctrl_rx;
2297
2298 trace_ath6kl_htc_rx(packet->status, packet->endpoint,
2299 packet->buf, packet->act_len);
2300
2301 /* process receive header */
2302 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL);
2303
2304 if (packet->status) {
2305 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n",
2306 packet->status);
2307 goto fail_ctrl_rx;
2308 }
2309
2310 return packet;
2311
2312 fail_ctrl_rx:
2313 if (packet != NULL) {
2314 htc_rxpkt_reset(packet);
2315 reclaim_rx_ctrl_buf(target, packet);
2316 }
2317
2318 return NULL;
2319 }
2320
2321 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target,
2322 struct list_head *pkt_queue)
2323 {
2324 struct htc_endpoint *endpoint;
2325 struct htc_packet *first_pkt;
2326 bool rx_unblock = false;
2327 int status = 0, depth;
2328
2329 if (list_empty(pkt_queue))
2330 return -ENOMEM;
2331
2332 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list);
2333
2334 if (first_pkt->endpoint >= ENDPOINT_MAX)
2335 return status;
2336
2337 depth = get_queue_depth(pkt_queue);
2338
2339 ath6kl_dbg(ATH6KL_DBG_HTC,
2340 "htc rx add multiple ep id %d cnt %d len %d\n",
2341 first_pkt->endpoint, depth, first_pkt->buf_len);
2342
2343 endpoint = &target->endpoint[first_pkt->endpoint];
2344
2345 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2346 struct htc_packet *packet, *tmp_pkt;
2347
2348 /* walk through queue and mark each one canceled */
2349 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
2350 packet->status = -ECANCELED;
2351 list_del(&packet->list);
2352 ath6kl_htc_rx_complete(endpoint, packet);
2353 }
2354
2355 return status;
2356 }
2357
2358 spin_lock_bh(&target->rx_lock);
2359
2360 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq);
2361
2362 /* check if we are blocked waiting for a new buffer */
2363 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2364 if (target->ep_waiting == first_pkt->endpoint) {
2365 ath6kl_dbg(ATH6KL_DBG_HTC,
2366 "htc rx blocked on ep %d, unblocking\n",
2367 target->ep_waiting);
2368 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS;
2369 target->ep_waiting = ENDPOINT_MAX;
2370 rx_unblock = true;
2371 }
2372 }
2373
2374 spin_unlock_bh(&target->rx_lock);
2375
2376 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING))
2377 /* TODO : implement a buffer threshold count? */
2378 ath6kl_hif_rx_control(target->dev, true);
2379
2380 return status;
2381 }
2382
2383 static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target)
2384 {
2385 struct htc_endpoint *endpoint;
2386 struct htc_packet *packet, *tmp_pkt;
2387 int i;
2388
2389 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2390 endpoint = &target->endpoint[i];
2391 if (!endpoint->svc_id)
2392 /* not in use.. */
2393 continue;
2394
2395 spin_lock_bh(&target->rx_lock);
2396 list_for_each_entry_safe(packet, tmp_pkt,
2397 &endpoint->rx_bufq, list) {
2398 list_del(&packet->list);
2399 spin_unlock_bh(&target->rx_lock);
2400 ath6kl_dbg(ATH6KL_DBG_HTC,
2401 "htc rx flush pkt 0x%p len %d ep %d\n",
2402 packet, packet->buf_len,
2403 packet->endpoint);
2404 /*
2405 * packets in rx_bufq of endpoint 0 have originally
2406 * been queued from target->free_ctrl_rxbuf where
2407 * packet and packet->buf_start are allocated
2408 * separately using kmalloc(). For other endpoint
2409 * rx_bufq, it is allocated as skb where packet is
2410 * skb->head. Take care of this difference while freeing
2411 * the memory.
2412 */
2413 if (packet->endpoint == ENDPOINT_0) {
2414 kfree(packet->buf_start);
2415 kfree(packet);
2416 } else {
2417 dev_kfree_skb(packet->pkt_cntxt);
2418 }
2419 spin_lock_bh(&target->rx_lock);
2420 }
2421 spin_unlock_bh(&target->rx_lock);
2422 }
2423 }
2424
2425 static int ath6kl_htc_mbox_conn_service(struct htc_target *target,
2426 struct htc_service_connect_req *conn_req,
2427 struct htc_service_connect_resp *conn_resp)
2428 {
2429 struct htc_packet *rx_pkt = NULL;
2430 struct htc_packet *tx_pkt = NULL;
2431 struct htc_conn_service_resp *resp_msg;
2432 struct htc_conn_service_msg *conn_msg;
2433 struct htc_endpoint *endpoint;
2434 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX;
2435 unsigned int max_msg_sz = 0;
2436 int status = 0;
2437 u16 msg_id;
2438
2439 ath6kl_dbg(ATH6KL_DBG_HTC,
2440 "htc connect service target 0x%p service id 0x%x\n",
2441 target, conn_req->svc_id);
2442
2443 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) {
2444 /* special case for pseudo control service */
2445 assigned_ep = ENDPOINT_0;
2446 max_msg_sz = HTC_MAX_CTRL_MSG_LEN;
2447 } else {
2448 /* allocate a packet to send to the target */
2449 tx_pkt = htc_get_control_buf(target, true);
2450
2451 if (!tx_pkt)
2452 return -ENOMEM;
2453
2454 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf;
2455 memset(conn_msg, 0, sizeof(*conn_msg));
2456 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID);
2457 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id);
2458 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags);
2459
2460 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg,
2461 sizeof(*conn_msg) + conn_msg->svc_meta_len,
2462 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
2463
2464 /* we want synchronous operation */
2465 tx_pkt->completion = NULL;
2466 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0);
2467 status = ath6kl_htc_tx_issue(target, tx_pkt);
2468
2469 if (status)
2470 goto fail_tx;
2471
2472 /* wait for response */
2473 rx_pkt = htc_wait_for_ctrl_msg(target);
2474
2475 if (!rx_pkt) {
2476 status = -ENOMEM;
2477 goto fail_tx;
2478 }
2479
2480 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf;
2481 msg_id = le16_to_cpu(resp_msg->msg_id);
2482
2483 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) ||
2484 (rx_pkt->act_len < sizeof(*resp_msg))) {
2485 status = -ENOMEM;
2486 goto fail_tx;
2487 }
2488
2489 conn_resp->resp_code = resp_msg->status;
2490 /* check response status */
2491 if (resp_msg->status != HTC_SERVICE_SUCCESS) {
2492 ath6kl_err("target failed service 0x%X connect request (status:%d)\n",
2493 resp_msg->svc_id, resp_msg->status);
2494 status = -ENOMEM;
2495 goto fail_tx;
2496 }
2497
2498 assigned_ep = (enum htc_endpoint_id)resp_msg->eid;
2499 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz);
2500 }
2501
2502 if (WARN_ON_ONCE(assigned_ep == ENDPOINT_UNUSED ||
2503 assigned_ep >= ENDPOINT_MAX || !max_msg_sz)) {
2504 status = -ENOMEM;
2505 goto fail_tx;
2506 }
2507
2508 endpoint = &target->endpoint[assigned_ep];
2509 endpoint->eid = assigned_ep;
2510 if (endpoint->svc_id) {
2511 status = -ENOMEM;
2512 goto fail_tx;
2513 }
2514
2515 /* return assigned endpoint to caller */
2516 conn_resp->endpoint = assigned_ep;
2517 conn_resp->len_max = max_msg_sz;
2518
2519 /* setup the endpoint */
2520
2521 /* this marks the endpoint in use */
2522 endpoint->svc_id = conn_req->svc_id;
2523
2524 endpoint->max_txq_depth = conn_req->max_txq_depth;
2525 endpoint->len_max = max_msg_sz;
2526 endpoint->ep_cb = conn_req->ep_cb;
2527 endpoint->cred_dist.svc_id = conn_req->svc_id;
2528 endpoint->cred_dist.htc_ep = endpoint;
2529 endpoint->cred_dist.endpoint = assigned_ep;
2530 endpoint->cred_dist.cred_sz = target->tgt_cred_sz;
2531
2532 switch (endpoint->svc_id) {
2533 case WMI_DATA_BK_SVC:
2534 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3;
2535 break;
2536 default:
2537 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM;
2538 break;
2539 }
2540
2541 if (conn_req->max_rxmsg_sz) {
2542 /*
2543 * Override cred_per_msg calculation, this optimizes
2544 * the credit-low indications since the host will actually
2545 * issue smaller messages in the Send path.
2546 */
2547 if (conn_req->max_rxmsg_sz > max_msg_sz) {
2548 status = -ENOMEM;
2549 goto fail_tx;
2550 }
2551 endpoint->cred_dist.cred_per_msg =
2552 conn_req->max_rxmsg_sz / target->tgt_cred_sz;
2553 } else
2554 endpoint->cred_dist.cred_per_msg =
2555 max_msg_sz / target->tgt_cred_sz;
2556
2557 if (!endpoint->cred_dist.cred_per_msg)
2558 endpoint->cred_dist.cred_per_msg = 1;
2559
2560 /* save local connection flags */
2561 endpoint->conn_flags = conn_req->flags;
2562
2563 fail_tx:
2564 if (tx_pkt)
2565 htc_reclaim_txctrl_buf(target, tx_pkt);
2566
2567 if (rx_pkt) {
2568 htc_rxpkt_reset(rx_pkt);
2569 reclaim_rx_ctrl_buf(target, rx_pkt);
2570 }
2571
2572 return status;
2573 }
2574
2575 static void reset_ep_state(struct htc_target *target)
2576 {
2577 struct htc_endpoint *endpoint;
2578 int i;
2579
2580 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2581 endpoint = &target->endpoint[i];
2582 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist));
2583 endpoint->svc_id = 0;
2584 endpoint->len_max = 0;
2585 endpoint->max_txq_depth = 0;
2586 memset(&endpoint->ep_st, 0,
2587 sizeof(endpoint->ep_st));
2588 INIT_LIST_HEAD(&endpoint->rx_bufq);
2589 INIT_LIST_HEAD(&endpoint->txq);
2590 endpoint->target = target;
2591 }
2592
2593 /* reset distribution list */
2594 /* FIXME: free existing entries */
2595 INIT_LIST_HEAD(&target->cred_dist_list);
2596 }
2597
2598 static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target,
2599 enum htc_endpoint_id endpoint)
2600 {
2601 int num;
2602
2603 spin_lock_bh(&target->rx_lock);
2604 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq));
2605 spin_unlock_bh(&target->rx_lock);
2606 return num;
2607 }
2608
2609 static void htc_setup_msg_bndl(struct htc_target *target)
2610 {
2611 /* limit what HTC can handle */
2612 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE,
2613 target->msg_per_bndl_max);
2614
2615 if (ath6kl_hif_enable_scatter(target->dev->ar)) {
2616 target->msg_per_bndl_max = 0;
2617 return;
2618 }
2619
2620 /* limit bundle what the device layer can handle */
2621 target->msg_per_bndl_max = min(target->max_scat_entries,
2622 target->msg_per_bndl_max);
2623
2624 ath6kl_dbg(ATH6KL_DBG_BOOT,
2625 "htc bundling allowed msg_per_bndl_max %d\n",
2626 target->msg_per_bndl_max);
2627
2628 /* Max rx bundle size is limited by the max tx bundle size */
2629 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq;
2630 /* Max tx bundle size if limited by the extended mbox address range */
2631 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH,
2632 target->max_xfer_szper_scatreq);
2633
2634 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n",
2635 target->max_rx_bndl_sz, target->max_tx_bndl_sz);
2636
2637 if (target->max_tx_bndl_sz)
2638 /* tx_bndl_mask is enabled per AC, each has 1 bit */
2639 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1;
2640
2641 if (target->max_rx_bndl_sz)
2642 target->rx_bndl_enable = true;
2643
2644 if ((target->tgt_cred_sz % target->block_sz) != 0) {
2645 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n",
2646 target->tgt_cred_sz);
2647
2648 /*
2649 * Disallow send bundling since the credit size is
2650 * not aligned to a block size the I/O block
2651 * padding will spill into the next credit buffer
2652 * which is fatal.
2653 */
2654 target->tx_bndl_mask = 0;
2655 }
2656 }
2657
2658 static int ath6kl_htc_mbox_wait_target(struct htc_target *target)
2659 {
2660 struct htc_packet *packet = NULL;
2661 struct htc_ready_ext_msg *rdy_msg;
2662 struct htc_service_connect_req connect;
2663 struct htc_service_connect_resp resp;
2664 int status;
2665
2666 /* we should be getting 1 control message that the target is ready */
2667 packet = htc_wait_for_ctrl_msg(target);
2668
2669 if (!packet)
2670 return -ENOMEM;
2671
2672 /* we controlled the buffer creation so it's properly aligned */
2673 rdy_msg = (struct htc_ready_ext_msg *)packet->buf;
2674
2675 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) ||
2676 (packet->act_len < sizeof(struct htc_ready_msg))) {
2677 status = -ENOMEM;
2678 goto fail_wait_target;
2679 }
2680
2681 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) {
2682 status = -ENOMEM;
2683 goto fail_wait_target;
2684 }
2685
2686 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt);
2687 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz);
2688
2689 ath6kl_dbg(ATH6KL_DBG_BOOT,
2690 "htc target ready credits %d size %d\n",
2691 target->tgt_creds, target->tgt_cred_sz);
2692
2693 /* check if this is an extended ready message */
2694 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) {
2695 /* this is an extended message */
2696 target->htc_tgt_ver = rdy_msg->htc_ver;
2697 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl;
2698 } else {
2699 /* legacy */
2700 target->htc_tgt_ver = HTC_VERSION_2P0;
2701 target->msg_per_bndl_max = 0;
2702 }
2703
2704 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n",
2705 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1",
2706 target->htc_tgt_ver);
2707
2708 if (target->msg_per_bndl_max > 0)
2709 htc_setup_msg_bndl(target);
2710
2711 /* setup our pseudo HTC control endpoint connection */
2712 memset(&connect, 0, sizeof(connect));
2713 memset(&resp, 0, sizeof(resp));
2714 connect.ep_cb.rx = htc_ctrl_rx;
2715 connect.ep_cb.rx_refill = NULL;
2716 connect.ep_cb.tx_full = NULL;
2717 connect.max_txq_depth = NUM_CONTROL_BUFFERS;
2718 connect.svc_id = HTC_CTRL_RSVD_SVC;
2719
2720 /* connect fake service */
2721 status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp);
2722
2723 if (status)
2724 /*
2725 * FIXME: this call doesn't make sense, the caller should
2726 * call ath6kl_htc_mbox_cleanup() when it wants remove htc
2727 */
2728 ath6kl_hif_cleanup_scatter(target->dev->ar);
2729
2730 fail_wait_target:
2731 if (packet) {
2732 htc_rxpkt_reset(packet);
2733 reclaim_rx_ctrl_buf(target, packet);
2734 }
2735
2736 return status;
2737 }
2738
2739 /*
2740 * Start HTC, enable interrupts and let the target know
2741 * host has finished setup.
2742 */
2743 static int ath6kl_htc_mbox_start(struct htc_target *target)
2744 {
2745 struct htc_packet *packet;
2746 int status;
2747
2748 memset(&target->dev->irq_proc_reg, 0,
2749 sizeof(target->dev->irq_proc_reg));
2750
2751 /* Disable interrupts at the chip level */
2752 ath6kl_hif_disable_intrs(target->dev);
2753
2754 target->htc_flags = 0;
2755 target->rx_st_flags = 0;
2756
2757 /* Push control receive buffers into htc control endpoint */
2758 while ((packet = htc_get_control_buf(target, false)) != NULL) {
2759 status = htc_add_rxbuf(target, packet);
2760 if (status)
2761 return status;
2762 }
2763
2764 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */
2765 ath6kl_credit_init(target->credit_info, &target->cred_dist_list,
2766 target->tgt_creds);
2767
2768 dump_cred_dist_stats(target);
2769
2770 /* Indicate to the target of the setup completion */
2771 status = htc_setup_tx_complete(target);
2772
2773 if (status)
2774 return status;
2775
2776 /* unmask interrupts */
2777 status = ath6kl_hif_unmask_intrs(target->dev);
2778
2779 if (status)
2780 ath6kl_htc_mbox_stop(target);
2781
2782 return status;
2783 }
2784
2785 static int ath6kl_htc_reset(struct htc_target *target)
2786 {
2787 u32 block_size, ctrl_bufsz;
2788 struct htc_packet *packet;
2789 int i;
2790
2791 reset_ep_state(target);
2792
2793 block_size = target->dev->ar->mbox_info.block_size;
2794
2795 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ?
2796 (block_size + HTC_HDR_LENGTH) :
2797 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH);
2798
2799 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) {
2800 packet = kzalloc(sizeof(*packet), GFP_KERNEL);
2801 if (!packet)
2802 return -ENOMEM;
2803
2804 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL);
2805 if (!packet->buf_start) {
2806 kfree(packet);
2807 return -ENOMEM;
2808 }
2809
2810 packet->buf_len = ctrl_bufsz;
2811 if (i < NUM_CONTROL_RX_BUFFERS) {
2812 packet->act_len = 0;
2813 packet->buf = packet->buf_start;
2814 packet->endpoint = ENDPOINT_0;
2815 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
2816 } else {
2817 list_add_tail(&packet->list, &target->free_ctrl_txbuf);
2818 }
2819 }
2820
2821 return 0;
2822 }
2823
2824 /* htc_stop: stop interrupt reception, and flush all queued buffers */
2825 static void ath6kl_htc_mbox_stop(struct htc_target *target)
2826 {
2827 spin_lock_bh(&target->htc_lock);
2828 target->htc_flags |= HTC_OP_STATE_STOPPING;
2829 spin_unlock_bh(&target->htc_lock);
2830
2831 /*
2832 * Masking interrupts is a synchronous operation, when this
2833 * function returns all pending HIF I/O has completed, we can
2834 * safely flush the queues.
2835 */
2836 ath6kl_hif_mask_intrs(target->dev);
2837
2838 ath6kl_htc_flush_txep_all(target);
2839
2840 ath6kl_htc_mbox_flush_rx_buf(target);
2841
2842 ath6kl_htc_reset(target);
2843 }
2844
2845 static void *ath6kl_htc_mbox_create(struct ath6kl *ar)
2846 {
2847 struct htc_target *target = NULL;
2848 int status = 0;
2849
2850 target = kzalloc(sizeof(*target), GFP_KERNEL);
2851 if (!target) {
2852 ath6kl_err("unable to allocate memory\n");
2853 return NULL;
2854 }
2855
2856 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL);
2857 if (!target->dev) {
2858 ath6kl_err("unable to allocate memory\n");
2859 status = -ENOMEM;
2860 goto err_htc_cleanup;
2861 }
2862
2863 spin_lock_init(&target->htc_lock);
2864 spin_lock_init(&target->rx_lock);
2865 spin_lock_init(&target->tx_lock);
2866
2867 INIT_LIST_HEAD(&target->free_ctrl_txbuf);
2868 INIT_LIST_HEAD(&target->free_ctrl_rxbuf);
2869 INIT_LIST_HEAD(&target->cred_dist_list);
2870
2871 target->dev->ar = ar;
2872 target->dev->htc_cnxt = target;
2873 target->ep_waiting = ENDPOINT_MAX;
2874
2875 status = ath6kl_hif_setup(target->dev);
2876 if (status)
2877 goto err_htc_cleanup;
2878
2879 status = ath6kl_htc_reset(target);
2880 if (status)
2881 goto err_htc_cleanup;
2882
2883 return target;
2884
2885 err_htc_cleanup:
2886 ath6kl_htc_mbox_cleanup(target);
2887
2888 return NULL;
2889 }
2890
2891 /* cleanup the HTC instance */
2892 static void ath6kl_htc_mbox_cleanup(struct htc_target *target)
2893 {
2894 struct htc_packet *packet, *tmp_packet;
2895
2896 ath6kl_hif_cleanup_scatter(target->dev->ar);
2897
2898 list_for_each_entry_safe(packet, tmp_packet,
2899 &target->free_ctrl_txbuf, list) {
2900 list_del(&packet->list);
2901 kfree(packet->buf_start);
2902 kfree(packet);
2903 }
2904
2905 list_for_each_entry_safe(packet, tmp_packet,
2906 &target->free_ctrl_rxbuf, list) {
2907 list_del(&packet->list);
2908 kfree(packet->buf_start);
2909 kfree(packet);
2910 }
2911
2912 kfree(target->dev);
2913 kfree(target);
2914 }
2915
2916 static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = {
2917 .create = ath6kl_htc_mbox_create,
2918 .wait_target = ath6kl_htc_mbox_wait_target,
2919 .start = ath6kl_htc_mbox_start,
2920 .conn_service = ath6kl_htc_mbox_conn_service,
2921 .tx = ath6kl_htc_mbox_tx,
2922 .stop = ath6kl_htc_mbox_stop,
2923 .cleanup = ath6kl_htc_mbox_cleanup,
2924 .flush_txep = ath6kl_htc_mbox_flush_txep,
2925 .flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf,
2926 .activity_changed = ath6kl_htc_mbox_activity_changed,
2927 .get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num,
2928 .add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple,
2929 .credit_setup = ath6kl_htc_mbox_credit_setup,
2930 };
2931
2932 void ath6kl_htc_mbox_attach(struct ath6kl *ar)
2933 {
2934 ar->htc_ops = &ath6kl_htc_mbox_ops;
2935 }
Linux kernel - Deliverables
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