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ARM: mm: Recreate kernel mappings in early_paging_init()
[linux/fpc-iii.git] / drivers / net / wireless / ath / ath6kl / htc_mbox.c
blob65e5b719093d47943b3135e902cf68001eefd988
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
135 ath6kl_dbg(ATH6KL_DBG_CREDIT,
136 "credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n",
137 cur_ep_dist->endpoint,
138 cur_ep_dist->svc_id,
139 cur_ep_dist->credits,
140 cur_ep_dist->cred_per_msg,
141 cur_ep_dist->cred_norm,
142 cur_ep_dist->cred_min);
143 }
144 }
145
146 /* initialize and setup credit distribution */
147 static int ath6kl_htc_mbox_credit_setup(struct htc_target *htc_target,
148 struct ath6kl_htc_credit_info *cred_info)
149 {
150 u16 servicepriority[5];
151
152 memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info));
153
154 servicepriority[0] = WMI_CONTROL_SVC; /* highest */
155 servicepriority[1] = WMI_DATA_VO_SVC;
156 servicepriority[2] = WMI_DATA_VI_SVC;
157 servicepriority[3] = WMI_DATA_BE_SVC;
158 servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */
159
160 /* set priority list */
161 ath6kl_htc_set_credit_dist(htc_target, cred_info, servicepriority, 5);
162
163 return 0;
164 }
165
166 /* reduce an ep's credits back to a set limit */
167 static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info,
168 struct htc_endpoint_credit_dist *ep_dist,
169 int limit)
170 {
171 int credits;
172
173 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n",
174 ep_dist->endpoint, limit);
175
176 ep_dist->cred_assngd = limit;
177
178 if (ep_dist->credits <= limit)
179 return;
180
181 credits = ep_dist->credits - limit;
182 ep_dist->credits -= credits;
183 cred_info->cur_free_credits += credits;
184 }
185
186 static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info,
187 struct list_head *epdist_list)
188 {
189 struct htc_endpoint_credit_dist *cur_list;
190
191 list_for_each_entry(cur_list, epdist_list, list) {
192 if (cur_list->endpoint == ENDPOINT_0)
193 continue;
194
195 if (cur_list->cred_to_dist > 0) {
196 cur_list->credits += cur_list->cred_to_dist;
197 cur_list->cred_to_dist = 0;
198
199 if (cur_list->credits > cur_list->cred_assngd)
200 ath6kl_credit_reduce(cred_info,
201 cur_list,
202 cur_list->cred_assngd);
203
204 if (cur_list->credits > cur_list->cred_norm)
205 ath6kl_credit_reduce(cred_info, cur_list,
206 cur_list->cred_norm);
207
208 if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) {
209 if (cur_list->txq_depth == 0)
210 ath6kl_credit_reduce(cred_info,
211 cur_list, 0);
212 }
213 }
214 }
215 }
216
217 /*
218 * HTC has an endpoint that needs credits, ep_dist is the endpoint in
219 * question.
220 */
221 static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info,
222 struct htc_endpoint_credit_dist *ep_dist)
223 {
224 struct htc_endpoint_credit_dist *curdist_list;
225 int credits = 0;
226 int need;
227
228 if (ep_dist->svc_id == WMI_CONTROL_SVC)
229 goto out;
230
231 if ((ep_dist->svc_id == WMI_DATA_VI_SVC) ||
232 (ep_dist->svc_id == WMI_DATA_VO_SVC))
233 if ((ep_dist->cred_assngd >= ep_dist->cred_norm))
234 goto out;
235
236 /*
237 * For all other services, we follow a simple algorithm of:
238 *
239 * 1. checking the free pool for credits
240 * 2. checking lower priority endpoints for credits to take
241 */
242
243 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
244
245 if (credits >= ep_dist->seek_cred)
246 goto out;
247
248 /*
249 * We don't have enough in the free pool, try taking away from
250 * lower priority services The rule for taking away credits:
251 *
252 * 1. Only take from lower priority endpoints
253 * 2. Only take what is allocated above the minimum (never
254 * starve an endpoint completely)
255 * 3. Only take what you need.
256 */
257
258 list_for_each_entry_reverse(curdist_list,
259 &cred_info->lowestpri_ep_dist,
260 list) {
261 if (curdist_list == ep_dist)
262 break;
263
264 need = ep_dist->seek_cred - cred_info->cur_free_credits;
265
266 if ((curdist_list->cred_assngd - need) >=
267 curdist_list->cred_min) {
268 /*
269 * The current one has been allocated more than
270 * it's minimum and it has enough credits assigned
271 * above it's minimum to fulfill our need try to
272 * take away just enough to fulfill our need.
273 */
274 ath6kl_credit_reduce(cred_info, curdist_list,
275 curdist_list->cred_assngd - need);
276
277 if (cred_info->cur_free_credits >=
278 ep_dist->seek_cred)
279 break;
280 }
281
282 if (curdist_list->endpoint == ENDPOINT_0)
283 break;
284 }
285
286 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
287
288 out:
289 /* did we find some credits? */
290 if (credits)
291 ath6kl_credit_deposit(cred_info, ep_dist, credits);
292
293 ep_dist->seek_cred = 0;
294 }
295
296 /* redistribute credits based on activity change */
297 static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info,
298 struct list_head *ep_dist_list)
299 {
300 struct htc_endpoint_credit_dist *curdist_list;
301
302 list_for_each_entry(curdist_list, ep_dist_list, list) {
303 if (curdist_list->endpoint == ENDPOINT_0)
304 continue;
305
306 if ((curdist_list->svc_id == WMI_DATA_BK_SVC) ||
307 (curdist_list->svc_id == WMI_DATA_BE_SVC))
308 curdist_list->dist_flags |= HTC_EP_ACTIVE;
309
310 if ((curdist_list->svc_id != WMI_CONTROL_SVC) &&
311 !(curdist_list->dist_flags & HTC_EP_ACTIVE)) {
312 if (curdist_list->txq_depth == 0)
313 ath6kl_credit_reduce(info, curdist_list, 0);
314 else
315 ath6kl_credit_reduce(info,
316 curdist_list,
317 curdist_list->cred_min);
318 }
319 }
320 }
321
322 /*
323 *
324 * This function is invoked whenever endpoints require credit
325 * distributions. A lock is held while this function is invoked, this
326 * function shall NOT block. The ep_dist_list is a list of distribution
327 * structures in prioritized order as defined by the call to the
328 * htc_set_credit_dist() api.
329 */
330 static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info,
331 struct list_head *ep_dist_list,
332 enum htc_credit_dist_reason reason)
333 {
334 switch (reason) {
335 case HTC_CREDIT_DIST_SEND_COMPLETE:
336 ath6kl_credit_update(cred_info, ep_dist_list);
337 break;
338 case HTC_CREDIT_DIST_ACTIVITY_CHANGE:
339 ath6kl_credit_redistribute(cred_info, ep_dist_list);
340 break;
341 default:
342 break;
343 }
344
345 WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits);
346 WARN_ON(cred_info->cur_free_credits < 0);
347 }
348
349 static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len)
350 {
351 u8 *align_addr;
352
353 if (!IS_ALIGNED((unsigned long) *buf, 4)) {
354 align_addr = PTR_ALIGN(*buf - 4, 4);
355 memmove(align_addr, *buf, len);
356 *buf = align_addr;
357 }
358 }
359
360 static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags,
361 int ctrl0, int ctrl1)
362 {
363 struct htc_frame_hdr *hdr;
364
365 packet->buf -= HTC_HDR_LENGTH;
366 hdr = (struct htc_frame_hdr *)packet->buf;
367
368 /* Endianess? */
369 put_unaligned((u16)packet->act_len, &hdr->payld_len);
370 hdr->flags = flags;
371 hdr->eid = packet->endpoint;
372 hdr->ctrl[0] = ctrl0;
373 hdr->ctrl[1] = ctrl1;
374 }
375
376 static void htc_reclaim_txctrl_buf(struct htc_target *target,
377 struct htc_packet *pkt)
378 {
379 spin_lock_bh(&target->htc_lock);
380 list_add_tail(&pkt->list, &target->free_ctrl_txbuf);
381 spin_unlock_bh(&target->htc_lock);
382 }
383
384 static struct htc_packet *htc_get_control_buf(struct htc_target *target,
385 bool tx)
386 {
387 struct htc_packet *packet = NULL;
388 struct list_head *buf_list;
389
390 buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf;
391
392 spin_lock_bh(&target->htc_lock);
393
394 if (list_empty(buf_list)) {
395 spin_unlock_bh(&target->htc_lock);
396 return NULL;
397 }
398
399 packet = list_first_entry(buf_list, struct htc_packet, list);
400 list_del(&packet->list);
401 spin_unlock_bh(&target->htc_lock);
402
403 if (tx)
404 packet->buf = packet->buf_start + HTC_HDR_LENGTH;
405
406 return packet;
407 }
408
409 static void htc_tx_comp_update(struct htc_target *target,
410 struct htc_endpoint *endpoint,
411 struct htc_packet *packet)
412 {
413 packet->completion = NULL;
414 packet->buf += HTC_HDR_LENGTH;
415
416 if (!packet->status)
417 return;
418
419 ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n",
420 packet->status, packet->endpoint, packet->act_len,
421 packet->info.tx.cred_used);
422
423 /* on failure to submit, reclaim credits for this packet */
424 spin_lock_bh(&target->tx_lock);
425 endpoint->cred_dist.cred_to_dist +=
426 packet->info.tx.cred_used;
427 endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq);
428
429 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n",
430 target->credit_info, &target->cred_dist_list);
431
432 ath6kl_credit_distribute(target->credit_info,
433 &target->cred_dist_list,
434 HTC_CREDIT_DIST_SEND_COMPLETE);
435
436 spin_unlock_bh(&target->tx_lock);
437 }
438
439 static void htc_tx_complete(struct htc_endpoint *endpoint,
440 struct list_head *txq)
441 {
442 if (list_empty(txq))
443 return;
444
445 ath6kl_dbg(ATH6KL_DBG_HTC,
446 "htc tx complete ep %d pkts %d\n",
447 endpoint->eid, get_queue_depth(txq));
448
449 ath6kl_tx_complete(endpoint->target, txq);
450 }
451
452 static void htc_tx_comp_handler(struct htc_target *target,
453 struct htc_packet *packet)
454 {
455 struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint];
456 struct list_head container;
457
458 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n",
459 packet->info.tx.seqno);
460
461 htc_tx_comp_update(target, endpoint, packet);
462 INIT_LIST_HEAD(&container);
463 list_add_tail(&packet->list, &container);
464 /* do completion */
465 htc_tx_complete(endpoint, &container);
466 }
467
468 static void htc_async_tx_scat_complete(struct htc_target *target,
469 struct hif_scatter_req *scat_req)
470 {
471 struct htc_endpoint *endpoint;
472 struct htc_packet *packet;
473 struct list_head tx_compq;
474 int i;
475
476 INIT_LIST_HEAD(&tx_compq);
477
478 ath6kl_dbg(ATH6KL_DBG_HTC,
479 "htc tx scat complete len %d entries %d\n",
480 scat_req->len, scat_req->scat_entries);
481
482 if (scat_req->status)
483 ath6kl_err("send scatter req failed: %d\n", scat_req->status);
484
485 packet = scat_req->scat_list[0].packet;
486 endpoint = &target->endpoint[packet->endpoint];
487
488 /* walk through the scatter list and process */
489 for (i = 0; i < scat_req->scat_entries; i++) {
490 packet = scat_req->scat_list[i].packet;
491 if (!packet) {
492 WARN_ON(1);
493 return;
494 }
495
496 packet->status = scat_req->status;
497 htc_tx_comp_update(target, endpoint, packet);
498 list_add_tail(&packet->list, &tx_compq);
499 }
500
501 /* free scatter request */
502 hif_scatter_req_add(target->dev->ar, scat_req);
503
504 /* complete all packets */
505 htc_tx_complete(endpoint, &tx_compq);
506 }
507
508 static int ath6kl_htc_tx_issue(struct htc_target *target,
509 struct htc_packet *packet)
510 {
511 int status;
512 bool sync = false;
513 u32 padded_len, send_len;
514
515 if (!packet->completion)
516 sync = true;
517
518 send_len = packet->act_len + HTC_HDR_LENGTH;
519
520 padded_len = CALC_TXRX_PADDED_LEN(target, send_len);
521
522 ath6kl_dbg(ATH6KL_DBG_HTC,
523 "htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n",
524 send_len, packet->info.tx.seqno, padded_len,
525 target->dev->ar->mbox_info.htc_addr,
526 sync ? "sync" : "async");
527
528 if (sync) {
529 status = hif_read_write_sync(target->dev->ar,
530 target->dev->ar->mbox_info.htc_addr,
531 packet->buf, padded_len,
532 HIF_WR_SYNC_BLOCK_INC);
533
534 packet->status = status;
535 packet->buf += HTC_HDR_LENGTH;
536 } else
537 status = hif_write_async(target->dev->ar,
538 target->dev->ar->mbox_info.htc_addr,
539 packet->buf, padded_len,
540 HIF_WR_ASYNC_BLOCK_INC, packet);
541
542 trace_ath6kl_htc_tx(status, packet->endpoint, packet->buf, send_len);
543
544 return status;
545 }
546
547 static int htc_check_credits(struct htc_target *target,
548 struct htc_endpoint *ep, u8 *flags,
549 enum htc_endpoint_id eid, unsigned int len,
550 int *req_cred)
551 {
552
553 *req_cred = (len > target->tgt_cred_sz) ?
554 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1;
555
556 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n",
557 *req_cred, ep->cred_dist.credits);
558
559 if (ep->cred_dist.credits < *req_cred) {
560 if (eid == ENDPOINT_0)
561 return -EINVAL;
562
563 /* Seek more credits */
564 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits;
565
566 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
567
568 ep->cred_dist.seek_cred = 0;
569
570 if (ep->cred_dist.credits < *req_cred) {
571 ath6kl_dbg(ATH6KL_DBG_CREDIT,
572 "credit not found for ep %d\n",
573 eid);
574 return -EINVAL;
575 }
576 }
577
578 ep->cred_dist.credits -= *req_cred;
579 ep->ep_st.cred_cosumd += *req_cred;
580
581 /* When we are getting low on credits, ask for more */
582 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
583 ep->cred_dist.seek_cred =
584 ep->cred_dist.cred_per_msg - ep->cred_dist.credits;
585
586 ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
587
588 /* see if we were successful in getting more */
589 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
590 /* tell the target we need credits ASAP! */
591 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
592 ep->ep_st.cred_low_indicate += 1;
593 ath6kl_dbg(ATH6KL_DBG_CREDIT,
594 "credit we need credits asap\n");
595 }
596 }
597
598 return 0;
599 }
600
601 static void ath6kl_htc_tx_pkts_get(struct htc_target *target,
602 struct htc_endpoint *endpoint,
603 struct list_head *queue)
604 {
605 int req_cred;
606 u8 flags;
607 struct htc_packet *packet;
608 unsigned int len;
609
610 while (true) {
611
612 flags = 0;
613
614 if (list_empty(&endpoint->txq))
615 break;
616 packet = list_first_entry(&endpoint->txq, struct htc_packet,
617 list);
618
619 ath6kl_dbg(ATH6KL_DBG_HTC,
620 "htc tx got packet 0x%p queue depth %d\n",
621 packet, get_queue_depth(&endpoint->txq));
622
623 len = CALC_TXRX_PADDED_LEN(target,
624 packet->act_len + HTC_HDR_LENGTH);
625
626 if (htc_check_credits(target, endpoint, &flags,
627 packet->endpoint, len, &req_cred))
628 break;
629
630 /* now we can fully move onto caller's queue */
631 packet = list_first_entry(&endpoint->txq, struct htc_packet,
632 list);
633 list_move_tail(&packet->list, queue);
634
635 /* save the number of credits this packet consumed */
636 packet->info.tx.cred_used = req_cred;
637
638 /* all TX packets are handled asynchronously */
639 packet->completion = htc_tx_comp_handler;
640 packet->context = target;
641 endpoint->ep_st.tx_issued += 1;
642
643 /* save send flags */
644 packet->info.tx.flags = flags;
645 packet->info.tx.seqno = endpoint->seqno;
646 endpoint->seqno++;
647 }
648 }
649
650 /* See if the padded tx length falls on a credit boundary */
651 static int htc_get_credit_padding(unsigned int cred_sz, int *len,
652 struct htc_endpoint *ep)
653 {
654 int rem_cred, cred_pad;
655
656 rem_cred = *len % cred_sz;
657
658 /* No padding needed */
659 if (!rem_cred)
660 return 0;
661
662 if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN))
663 return -1;
664
665 /*
666 * The transfer consumes a "partial" credit, this
667 * packet cannot be bundled unless we add
668 * additional "dummy" padding (max 255 bytes) to
669 * consume the entire credit.
670 */
671 cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred;
672
673 if ((cred_pad > 0) && (cred_pad <= 255))
674 *len += cred_pad;
675 else
676 /* The amount of padding is too large, send as non-bundled */
677 return -1;
678
679 return cred_pad;
680 }
681
682 static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target,
683 struct htc_endpoint *endpoint,
684 struct hif_scatter_req *scat_req,
685 int n_scat,
686 struct list_head *queue)
687 {
688 struct htc_packet *packet;
689 int i, len, rem_scat, cred_pad;
690 int status = 0;
691 u8 flags;
692
693 rem_scat = target->max_tx_bndl_sz;
694
695 for (i = 0; i < n_scat; i++) {
696 scat_req->scat_list[i].packet = NULL;
697
698 if (list_empty(queue))
699 break;
700
701 packet = list_first_entry(queue, struct htc_packet, list);
702 len = CALC_TXRX_PADDED_LEN(target,
703 packet->act_len + HTC_HDR_LENGTH);
704
705 cred_pad = htc_get_credit_padding(target->tgt_cred_sz,
706 &len, endpoint);
707 if (cred_pad < 0 || rem_scat < len) {
708 status = -ENOSPC;
709 break;
710 }
711
712 rem_scat -= len;
713 /* now remove it from the queue */
714 list_del(&packet->list);
715
716 scat_req->scat_list[i].packet = packet;
717 /* prepare packet and flag message as part of a send bundle */
718 flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE;
719 ath6kl_htc_tx_prep_pkt(packet, flags,
720 cred_pad, packet->info.tx.seqno);
721 /* Make sure the buffer is 4-byte aligned */
722 ath6kl_htc_tx_buf_align(&packet->buf,
723 packet->act_len + HTC_HDR_LENGTH);
724 scat_req->scat_list[i].buf = packet->buf;
725 scat_req->scat_list[i].len = len;
726
727 scat_req->len += len;
728 scat_req->scat_entries++;
729 ath6kl_dbg(ATH6KL_DBG_HTC,
730 "htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n",
731 i, packet, packet->info.tx.seqno, len, rem_scat);
732 }
733
734 /* Roll back scatter setup in case of any failure */
735 if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) {
736 for (i = scat_req->scat_entries - 1; i >= 0; i--) {
737 packet = scat_req->scat_list[i].packet;
738 if (packet) {
739 packet->buf += HTC_HDR_LENGTH;
740 list_add(&packet->list, queue);
741 }
742 }
743 return -EAGAIN;
744 }
745
746 return status;
747 }
748
749 /*
750 * Drain a queue and send as bundles this function may return without fully
751 * draining the queue when
752 *
753 * 1. scatter resources are exhausted
754 * 2. a message that will consume a partial credit will stop the
755 * bundling process early
756 * 3. we drop below the minimum number of messages for a bundle
757 */
758 static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint,
759 struct list_head *queue,
760 int *sent_bundle, int *n_bundle_pkts)
761 {
762 struct htc_target *target = endpoint->target;
763 struct hif_scatter_req *scat_req = NULL;
764 int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0, i;
765 struct htc_packet *packet;
766 int status;
767 u32 txb_mask;
768 u8 ac = WMM_NUM_AC;
769
770 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
771 (WMI_CONTROL_SVC != endpoint->svc_id))
772 ac = target->dev->ar->ep2ac_map[endpoint->eid];
773
774 while (true) {
775 status = 0;
776 n_scat = get_queue_depth(queue);
777 n_scat = min(n_scat, target->msg_per_bndl_max);
778
779 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE)
780 /* not enough to bundle */
781 break;
782
783 scat_req = hif_scatter_req_get(target->dev->ar);
784
785 if (!scat_req) {
786 /* no scatter resources */
787 ath6kl_dbg(ATH6KL_DBG_HTC,
788 "htc tx no more scatter resources\n");
789 break;
790 }
791
792 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) {
793 if (WMM_AC_BE == ac)
794 /*
795 * BE, BK have priorities and bit
796 * positions reversed
797 */
798 txb_mask = (1 << WMM_AC_BK);
799 else
800 /*
801 * any AC with priority lower than
802 * itself
803 */
804 txb_mask = ((1 << ac) - 1);
805
806 /*
807 * when the scatter request resources drop below a
808 * certain threshold, disable Tx bundling for all
809 * AC's with priority lower than the current requesting
810 * AC. Otherwise re-enable Tx bundling for them
811 */
812 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS)
813 target->tx_bndl_mask &= ~txb_mask;
814 else
815 target->tx_bndl_mask |= txb_mask;
816 }
817
818 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n",
819 n_scat);
820
821 scat_req->len = 0;
822 scat_req->scat_entries = 0;
823
824 status = ath6kl_htc_tx_setup_scat_list(target, endpoint,
825 scat_req, n_scat,
826 queue);
827 if (status == -EAGAIN) {
828 hif_scatter_req_add(target->dev->ar, scat_req);
829 break;
830 }
831
832 /* send path is always asynchronous */
833 scat_req->complete = htc_async_tx_scat_complete;
834 n_sent_bundle++;
835 tot_pkts_bundle += scat_req->scat_entries;
836
837 ath6kl_dbg(ATH6KL_DBG_HTC,
838 "htc tx scatter bytes %d entries %d\n",
839 scat_req->len, scat_req->scat_entries);
840
841 for (i = 0; i < scat_req->scat_entries; i++) {
842 packet = scat_req->scat_list[i].packet;
843 trace_ath6kl_htc_tx(packet->status, packet->endpoint,
844 packet->buf, packet->act_len);
845 }
846
847 ath6kl_hif_submit_scat_req(target->dev, scat_req, false);
848
849 if (status)
850 break;
851 }
852
853 *sent_bundle = n_sent_bundle;
854 *n_bundle_pkts = tot_pkts_bundle;
855 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n",
856 n_sent_bundle);
857
858 return;
859 }
860
861 static void ath6kl_htc_tx_from_queue(struct htc_target *target,
862 struct htc_endpoint *endpoint)
863 {
864 struct list_head txq;
865 struct htc_packet *packet;
866 int bundle_sent;
867 int n_pkts_bundle;
868 u8 ac = WMM_NUM_AC;
869 int status;
870
871 spin_lock_bh(&target->tx_lock);
872
873 endpoint->tx_proc_cnt++;
874 if (endpoint->tx_proc_cnt > 1) {
875 endpoint->tx_proc_cnt--;
876 spin_unlock_bh(&target->tx_lock);
877 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n");
878 return;
879 }
880
881 /*
882 * drain the endpoint TX queue for transmission as long
883 * as we have enough credits.
884 */
885 INIT_LIST_HEAD(&txq);
886
887 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
888 (WMI_CONTROL_SVC != endpoint->svc_id))
889 ac = target->dev->ar->ep2ac_map[endpoint->eid];
890
891 while (true) {
892
893 if (list_empty(&endpoint->txq))
894 break;
895
896 ath6kl_htc_tx_pkts_get(target, endpoint, &txq);
897
898 if (list_empty(&txq))
899 break;
900
901 spin_unlock_bh(&target->tx_lock);
902
903 bundle_sent = 0;
904 n_pkts_bundle = 0;
905
906 while (true) {
907 /* try to send a bundle on each pass */
908 if ((target->tx_bndl_mask) &&
909 (get_queue_depth(&txq) >=
910 HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
911 int temp1 = 0, temp2 = 0;
912
913 /* check if bundling is enabled for an AC */
914 if (target->tx_bndl_mask & (1 << ac)) {
915 ath6kl_htc_tx_bundle(endpoint, &txq,
916 &temp1, &temp2);
917 bundle_sent += temp1;
918 n_pkts_bundle += temp2;
919 }
920 }
921
922 if (list_empty(&txq))
923 break;
924
925 packet = list_first_entry(&txq, struct htc_packet,
926 list);
927 list_del(&packet->list);
928
929 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags,
930 0, packet->info.tx.seqno);
931 status = ath6kl_htc_tx_issue(target, packet);
932
933 if (status) {
934 packet->status = status;
935 packet->completion(packet->context, packet);
936 }
937 }
938
939 spin_lock_bh(&target->tx_lock);
940
941 endpoint->ep_st.tx_bundles += bundle_sent;
942 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle;
943
944 /*
945 * if an AC has bundling disabled and no tx bundling
946 * has occured continously for a certain number of TX,
947 * enable tx bundling for this AC
948 */
949 if (!bundle_sent) {
950 if (!(target->tx_bndl_mask & (1 << ac)) &&
951 (ac < WMM_NUM_AC)) {
952 if (++target->ac_tx_count[ac] >=
953 TX_RESUME_BUNDLE_THRESHOLD) {
954 target->ac_tx_count[ac] = 0;
955 target->tx_bndl_mask |= (1 << ac);
956 }
957 }
958 } else {
959 /* tx bundling will reset the counter */
960 if (ac < WMM_NUM_AC)
961 target->ac_tx_count[ac] = 0;
962 }
963 }
964
965 endpoint->tx_proc_cnt = 0;
966 spin_unlock_bh(&target->tx_lock);
967 }
968
969 static bool ath6kl_htc_tx_try(struct htc_target *target,
970 struct htc_endpoint *endpoint,
971 struct htc_packet *tx_pkt)
972 {
973 struct htc_ep_callbacks ep_cb;
974 int txq_depth;
975 bool overflow = false;
976
977 ep_cb = endpoint->ep_cb;
978
979 spin_lock_bh(&target->tx_lock);
980 txq_depth = get_queue_depth(&endpoint->txq);
981 spin_unlock_bh(&target->tx_lock);
982
983 if (txq_depth >= endpoint->max_txq_depth)
984 overflow = true;
985
986 if (overflow)
987 ath6kl_dbg(ATH6KL_DBG_HTC,
988 "htc tx overflow ep %d depth %d max %d\n",
989 endpoint->eid, txq_depth,
990 endpoint->max_txq_depth);
991
992 if (overflow && ep_cb.tx_full) {
993 if (ep_cb.tx_full(endpoint->target, tx_pkt) ==
994 HTC_SEND_FULL_DROP) {
995 endpoint->ep_st.tx_dropped += 1;
996 return false;
997 }
998 }
999
1000 spin_lock_bh(&target->tx_lock);
1001 list_add_tail(&tx_pkt->list, &endpoint->txq);
1002 spin_unlock_bh(&target->tx_lock);
1003
1004 ath6kl_htc_tx_from_queue(target, endpoint);
1005
1006 return true;
1007 }
1008
1009 static void htc_chk_ep_txq(struct htc_target *target)
1010 {
1011 struct htc_endpoint *endpoint;
1012 struct htc_endpoint_credit_dist *cred_dist;
1013
1014 /*
1015 * Run through the credit distribution list to see if there are
1016 * packets queued. NOTE: no locks need to be taken since the
1017 * distribution list is not dynamic (cannot be re-ordered) and we
1018 * are not modifying any state.
1019 */
1020 list_for_each_entry(cred_dist, &target->cred_dist_list, list) {
1021 endpoint = cred_dist->htc_ep;
1022
1023 spin_lock_bh(&target->tx_lock);
1024 if (!list_empty(&endpoint->txq)) {
1025 ath6kl_dbg(ATH6KL_DBG_HTC,
1026 "htc creds ep %d credits %d pkts %d\n",
1027 cred_dist->endpoint,
1028 endpoint->cred_dist.credits,
1029 get_queue_depth(&endpoint->txq));
1030 spin_unlock_bh(&target->tx_lock);
1031 /*
1032 * Try to start the stalled queue, this list is
1033 * ordered by priority. If there are credits
1034 * available the highest priority queue will get a
1035 * chance to reclaim credits from lower priority
1036 * ones.
1037 */
1038 ath6kl_htc_tx_from_queue(target, endpoint);
1039 spin_lock_bh(&target->tx_lock);
1040 }
1041 spin_unlock_bh(&target->tx_lock);
1042 }
1043 }
1044
1045 static int htc_setup_tx_complete(struct htc_target *target)
1046 {
1047 struct htc_packet *send_pkt = NULL;
1048 int status;
1049
1050 send_pkt = htc_get_control_buf(target, true);
1051
1052 if (!send_pkt)
1053 return -ENOMEM;
1054
1055 if (target->htc_tgt_ver >= HTC_VERSION_2P1) {
1056 struct htc_setup_comp_ext_msg *setup_comp_ext;
1057 u32 flags = 0;
1058
1059 setup_comp_ext =
1060 (struct htc_setup_comp_ext_msg *)send_pkt->buf;
1061 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext));
1062 setup_comp_ext->msg_id =
1063 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID);
1064
1065 if (target->msg_per_bndl_max > 0) {
1066 /* Indicate HTC bundling to the target */
1067 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN;
1068 setup_comp_ext->msg_per_rxbndl =
1069 target->msg_per_bndl_max;
1070 }
1071
1072 memcpy(&setup_comp_ext->flags, &flags,
1073 sizeof(setup_comp_ext->flags));
1074 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext,
1075 sizeof(struct htc_setup_comp_ext_msg),
1076 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1077
1078 } else {
1079 struct htc_setup_comp_msg *setup_comp;
1080 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf;
1081 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg));
1082 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID);
1083 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp,
1084 sizeof(struct htc_setup_comp_msg),
1085 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
1086 }
1087
1088 /* we want synchronous operation */
1089 send_pkt->completion = NULL;
1090 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0);
1091 status = ath6kl_htc_tx_issue(target, send_pkt);
1092
1093 if (send_pkt != NULL)
1094 htc_reclaim_txctrl_buf(target, send_pkt);
1095
1096 return status;
1097 }
1098
1099 static void ath6kl_htc_set_credit_dist(struct htc_target *target,
1100 struct ath6kl_htc_credit_info *credit_info,
1101 u16 srvc_pri_order[], int list_len)
1102 {
1103 struct htc_endpoint *endpoint;
1104 int i, ep;
1105
1106 target->credit_info = credit_info;
1107
1108 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list,
1109 &target->cred_dist_list);
1110
1111 for (i = 0; i < list_len; i++) {
1112 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) {
1113 endpoint = &target->endpoint[ep];
1114 if (endpoint->svc_id == srvc_pri_order[i]) {
1115 list_add_tail(&endpoint->cred_dist.list,
1116 &target->cred_dist_list);
1117 break;
1118 }
1119 }
1120 if (ep >= ENDPOINT_MAX) {
1121 WARN_ON(1);
1122 return;
1123 }
1124 }
1125 }
1126
1127 static int ath6kl_htc_mbox_tx(struct htc_target *target,
1128 struct htc_packet *packet)
1129 {
1130 struct htc_endpoint *endpoint;
1131 struct list_head queue;
1132
1133 ath6kl_dbg(ATH6KL_DBG_HTC,
1134 "htc tx ep id %d buf 0x%p len %d\n",
1135 packet->endpoint, packet->buf, packet->act_len);
1136
1137 if (packet->endpoint >= ENDPOINT_MAX) {
1138 WARN_ON(1);
1139 return -EINVAL;
1140 }
1141
1142 endpoint = &target->endpoint[packet->endpoint];
1143
1144 if (!ath6kl_htc_tx_try(target, endpoint, packet)) {
1145 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ?
1146 -ECANCELED : -ENOSPC;
1147 INIT_LIST_HEAD(&queue);
1148 list_add(&packet->list, &queue);
1149 htc_tx_complete(endpoint, &queue);
1150 }
1151
1152 return 0;
1153 }
1154
1155 /* flush endpoint TX queue */
1156 static void ath6kl_htc_mbox_flush_txep(struct htc_target *target,
1157 enum htc_endpoint_id eid, u16 tag)
1158 {
1159 struct htc_packet *packet, *tmp_pkt;
1160 struct list_head discard_q, container;
1161 struct htc_endpoint *endpoint = &target->endpoint[eid];
1162
1163 if (!endpoint->svc_id) {
1164 WARN_ON(1);
1165 return;
1166 }
1167
1168 /* initialize the discard queue */
1169 INIT_LIST_HEAD(&discard_q);
1170
1171 spin_lock_bh(&target->tx_lock);
1172
1173 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) {
1174 if ((tag == HTC_TX_PACKET_TAG_ALL) ||
1175 (tag == packet->info.tx.tag))
1176 list_move_tail(&packet->list, &discard_q);
1177 }
1178
1179 spin_unlock_bh(&target->tx_lock);
1180
1181 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) {
1182 packet->status = -ECANCELED;
1183 list_del(&packet->list);
1184 ath6kl_dbg(ATH6KL_DBG_HTC,
1185 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n",
1186 packet, packet->act_len,
1187 packet->endpoint, packet->info.tx.tag);
1188
1189 INIT_LIST_HEAD(&container);
1190 list_add_tail(&packet->list, &container);
1191 htc_tx_complete(endpoint, &container);
1192 }
1193
1194 }
1195
1196 static void ath6kl_htc_flush_txep_all(struct htc_target *target)
1197 {
1198 struct htc_endpoint *endpoint;
1199 int i;
1200
1201 dump_cred_dist_stats(target);
1202
1203 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
1204 endpoint = &target->endpoint[i];
1205 if (endpoint->svc_id == 0)
1206 /* not in use.. */
1207 continue;
1208 ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL);
1209 }
1210 }
1211
1212 static void ath6kl_htc_mbox_activity_changed(struct htc_target *target,
1213 enum htc_endpoint_id eid,
1214 bool active)
1215 {
1216 struct htc_endpoint *endpoint = &target->endpoint[eid];
1217 bool dist = false;
1218
1219 if (endpoint->svc_id == 0) {
1220 WARN_ON(1);
1221 return;
1222 }
1223
1224 spin_lock_bh(&target->tx_lock);
1225
1226 if (active) {
1227 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) {
1228 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE;
1229 dist = true;
1230 }
1231 } else {
1232 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) {
1233 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE;
1234 dist = true;
1235 }
1236 }
1237
1238 if (dist) {
1239 endpoint->cred_dist.txq_depth =
1240 get_queue_depth(&endpoint->txq);
1241
1242 ath6kl_dbg(ATH6KL_DBG_HTC,
1243 "htc tx activity ctxt 0x%p dist 0x%p\n",
1244 target->credit_info, &target->cred_dist_list);
1245
1246 ath6kl_credit_distribute(target->credit_info,
1247 &target->cred_dist_list,
1248 HTC_CREDIT_DIST_ACTIVITY_CHANGE);
1249 }
1250
1251 spin_unlock_bh(&target->tx_lock);
1252
1253 if (dist && !active)
1254 htc_chk_ep_txq(target);
1255 }
1256
1257 /* HTC Rx */
1258
1259 static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint,
1260 int n_look_ahds)
1261 {
1262 endpoint->ep_st.rx_pkts++;
1263 if (n_look_ahds == 1)
1264 endpoint->ep_st.rx_lkahds++;
1265 else if (n_look_ahds > 1)
1266 endpoint->ep_st.rx_bundle_lkahd++;
1267 }
1268
1269 static inline bool htc_valid_rx_frame_len(struct htc_target *target,
1270 enum htc_endpoint_id eid, int len)
1271 {
1272 return (eid == target->dev->ar->ctrl_ep) ?
1273 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE;
1274 }
1275
1276 static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet)
1277 {
1278 struct list_head queue;
1279
1280 INIT_LIST_HEAD(&queue);
1281 list_add_tail(&packet->list, &queue);
1282 return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue);
1283 }
1284
1285 static void htc_reclaim_rxbuf(struct htc_target *target,
1286 struct htc_packet *packet,
1287 struct htc_endpoint *ep)
1288 {
1289 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) {
1290 htc_rxpkt_reset(packet);
1291 packet->status = -ECANCELED;
1292 ep->ep_cb.rx(ep->target, packet);
1293 } else {
1294 htc_rxpkt_reset(packet);
1295 htc_add_rxbuf((void *)(target), packet);
1296 }
1297 }
1298
1299 static void reclaim_rx_ctrl_buf(struct htc_target *target,
1300 struct htc_packet *packet)
1301 {
1302 spin_lock_bh(&target->htc_lock);
1303 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
1304 spin_unlock_bh(&target->htc_lock);
1305 }
1306
1307 static int ath6kl_htc_rx_packet(struct htc_target *target,
1308 struct htc_packet *packet,
1309 u32 rx_len)
1310 {
1311 struct ath6kl_device *dev = target->dev;
1312 u32 padded_len;
1313 int status;
1314
1315 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len);
1316
1317 if (padded_len > packet->buf_len) {
1318 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n",
1319 padded_len, rx_len, packet->buf_len);
1320 return -ENOMEM;
1321 }
1322
1323 ath6kl_dbg(ATH6KL_DBG_HTC,
1324 "htc rx 0x%p hdr 0x%x len %d mbox 0x%x\n",
1325 packet, packet->info.rx.exp_hdr,
1326 padded_len, dev->ar->mbox_info.htc_addr);
1327
1328 status = hif_read_write_sync(dev->ar,
1329 dev->ar->mbox_info.htc_addr,
1330 packet->buf, padded_len,
1331 HIF_RD_SYNC_BLOCK_FIX);
1332
1333 packet->status = status;
1334
1335 return status;
1336 }
1337
1338 /*
1339 * optimization for recv packets, we can indicate a
1340 * "hint" that there are more single-packets to fetch
1341 * on this endpoint.
1342 */
1343 static void ath6kl_htc_rx_set_indicate(u32 lk_ahd,
1344 struct htc_endpoint *endpoint,
1345 struct htc_packet *packet)
1346 {
1347 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd;
1348
1349 if (htc_hdr->eid == packet->endpoint) {
1350 if (!list_empty(&endpoint->rx_bufq))
1351 packet->info.rx.indicat_flags |=
1352 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
1353 }
1354 }
1355
1356 static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint)
1357 {
1358 struct htc_ep_callbacks ep_cb = endpoint->ep_cb;
1359
1360 if (ep_cb.rx_refill_thresh > 0) {
1361 spin_lock_bh(&endpoint->target->rx_lock);
1362 if (get_queue_depth(&endpoint->rx_bufq)
1363 < ep_cb.rx_refill_thresh) {
1364 spin_unlock_bh(&endpoint->target->rx_lock);
1365 ep_cb.rx_refill(endpoint->target, endpoint->eid);
1366 return;
1367 }
1368 spin_unlock_bh(&endpoint->target->rx_lock);
1369 }
1370 }
1371
1372 /* This function is called with rx_lock held */
1373 static int ath6kl_htc_rx_setup(struct htc_target *target,
1374 struct htc_endpoint *ep,
1375 u32 *lk_ahds, struct list_head *queue, int n_msg)
1376 {
1377 struct htc_packet *packet;
1378 /* FIXME: type of lk_ahds can't be right */
1379 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds;
1380 struct htc_ep_callbacks ep_cb;
1381 int status = 0, j, full_len;
1382 bool no_recycle;
1383
1384 full_len = CALC_TXRX_PADDED_LEN(target,
1385 le16_to_cpu(htc_hdr->payld_len) +
1386 sizeof(*htc_hdr));
1387
1388 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) {
1389 ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n",
1390 htc_hdr->eid, htc_hdr->flags,
1391 le16_to_cpu(htc_hdr->payld_len));
1392 return -EINVAL;
1393 }
1394
1395 ep_cb = ep->ep_cb;
1396 for (j = 0; j < n_msg; j++) {
1397
1398 /*
1399 * Reset flag, any packets allocated using the
1400 * rx_alloc() API cannot be recycled on
1401 * cleanup,they must be explicitly returned.
1402 */
1403 no_recycle = false;
1404
1405 if (ep_cb.rx_allocthresh &&
1406 (full_len > ep_cb.rx_alloc_thresh)) {
1407 ep->ep_st.rx_alloc_thresh_hit += 1;
1408 ep->ep_st.rxalloc_thresh_byte +=
1409 le16_to_cpu(htc_hdr->payld_len);
1410
1411 spin_unlock_bh(&target->rx_lock);
1412 no_recycle = true;
1413
1414 packet = ep_cb.rx_allocthresh(ep->target, ep->eid,
1415 full_len);
1416 spin_lock_bh(&target->rx_lock);
1417 } else {
1418 /* refill handler is being used */
1419 if (list_empty(&ep->rx_bufq)) {
1420 if (ep_cb.rx_refill) {
1421 spin_unlock_bh(&target->rx_lock);
1422 ep_cb.rx_refill(ep->target, ep->eid);
1423 spin_lock_bh(&target->rx_lock);
1424 }
1425 }
1426
1427 if (list_empty(&ep->rx_bufq))
1428 packet = NULL;
1429 else {
1430 packet = list_first_entry(&ep->rx_bufq,
1431 struct htc_packet, list);
1432 list_del(&packet->list);
1433 }
1434 }
1435
1436 if (!packet) {
1437 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS;
1438 target->ep_waiting = ep->eid;
1439 return -ENOSPC;
1440 }
1441
1442 /* clear flags */
1443 packet->info.rx.rx_flags = 0;
1444 packet->info.rx.indicat_flags = 0;
1445 packet->status = 0;
1446
1447 if (no_recycle)
1448 /*
1449 * flag that these packets cannot be
1450 * recycled, they have to be returned to
1451 * the user
1452 */
1453 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE;
1454
1455 /* Caller needs to free this upon any failure */
1456 list_add_tail(&packet->list, queue);
1457
1458 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
1459 status = -ECANCELED;
1460 break;
1461 }
1462
1463 if (j) {
1464 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR;
1465 packet->info.rx.exp_hdr = 0xFFFFFFFF;
1466 } else
1467 /* set expected look ahead */
1468 packet->info.rx.exp_hdr = *lk_ahds;
1469
1470 packet->act_len = le16_to_cpu(htc_hdr->payld_len) +
1471 HTC_HDR_LENGTH;
1472 }
1473
1474 return status;
1475 }
1476
1477 static int ath6kl_htc_rx_alloc(struct htc_target *target,
1478 u32 lk_ahds[], int msg,
1479 struct htc_endpoint *endpoint,
1480 struct list_head *queue)
1481 {
1482 int status = 0;
1483 struct htc_packet *packet, *tmp_pkt;
1484 struct htc_frame_hdr *htc_hdr;
1485 int i, n_msg;
1486
1487 spin_lock_bh(&target->rx_lock);
1488
1489 for (i = 0; i < msg; i++) {
1490
1491 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i];
1492
1493 if (htc_hdr->eid >= ENDPOINT_MAX) {
1494 ath6kl_err("invalid ep in look-ahead: %d\n",
1495 htc_hdr->eid);
1496 status = -ENOMEM;
1497 break;
1498 }
1499
1500 if (htc_hdr->eid != endpoint->eid) {
1501 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n",
1502 htc_hdr->eid, endpoint->eid, i);
1503 status = -ENOMEM;
1504 break;
1505 }
1506
1507 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) {
1508 ath6kl_err("payload len %d exceeds max htc : %d !\n",
1509 htc_hdr->payld_len,
1510 (u32) HTC_MAX_PAYLOAD_LENGTH);
1511 status = -ENOMEM;
1512 break;
1513 }
1514
1515 if (endpoint->svc_id == 0) {
1516 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid);
1517 status = -ENOMEM;
1518 break;
1519 }
1520
1521 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) {
1522 /*
1523 * HTC header indicates that every packet to follow
1524 * has the same padded length so that it can be
1525 * optimally fetched as a full bundle.
1526 */
1527 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >>
1528 HTC_FLG_RX_BNDL_CNT_S;
1529
1530 /* the count doesn't include the starter frame */
1531 n_msg++;
1532 if (n_msg > target->msg_per_bndl_max) {
1533 status = -ENOMEM;
1534 break;
1535 }
1536
1537 endpoint->ep_st.rx_bundle_from_hdr += 1;
1538 ath6kl_dbg(ATH6KL_DBG_HTC,
1539 "htc rx bundle pkts %d\n",
1540 n_msg);
1541 } else
1542 /* HTC header only indicates 1 message to fetch */
1543 n_msg = 1;
1544
1545 /* Setup packet buffers for each message */
1546 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i],
1547 queue, n_msg);
1548
1549 /*
1550 * This is due to unavailabilty of buffers to rx entire data.
1551 * Return no error so that free buffers from queue can be used
1552 * to receive partial data.
1553 */
1554 if (status == -ENOSPC) {
1555 spin_unlock_bh(&target->rx_lock);
1556 return 0;
1557 }
1558
1559 if (status)
1560 break;
1561 }
1562
1563 spin_unlock_bh(&target->rx_lock);
1564
1565 if (status) {
1566 list_for_each_entry_safe(packet, tmp_pkt, queue, list) {
1567 list_del(&packet->list);
1568 htc_reclaim_rxbuf(target, packet,
1569 &target->endpoint[packet->endpoint]);
1570 }
1571 }
1572
1573 return status;
1574 }
1575
1576 static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets)
1577 {
1578 if (packets->endpoint != ENDPOINT_0) {
1579 WARN_ON(1);
1580 return;
1581 }
1582
1583 if (packets->status == -ECANCELED) {
1584 reclaim_rx_ctrl_buf(context, packets);
1585 return;
1586 }
1587
1588 if (packets->act_len > 0) {
1589 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n",
1590 packets->act_len + HTC_HDR_LENGTH);
1591
1592 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1593 "htc rx unexpected endpoint 0 message", "",
1594 packets->buf - HTC_HDR_LENGTH,
1595 packets->act_len + HTC_HDR_LENGTH);
1596 }
1597
1598 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]);
1599 }
1600
1601 static void htc_proc_cred_rpt(struct htc_target *target,
1602 struct htc_credit_report *rpt,
1603 int n_entries,
1604 enum htc_endpoint_id from_ep)
1605 {
1606 struct htc_endpoint *endpoint;
1607 int tot_credits = 0, i;
1608 bool dist = false;
1609
1610 spin_lock_bh(&target->tx_lock);
1611
1612 for (i = 0; i < n_entries; i++, rpt++) {
1613 if (rpt->eid >= ENDPOINT_MAX) {
1614 WARN_ON(1);
1615 spin_unlock_bh(&target->tx_lock);
1616 return;
1617 }
1618
1619 endpoint = &target->endpoint[rpt->eid];
1620
1621 ath6kl_dbg(ATH6KL_DBG_CREDIT,
1622 "credit report ep %d credits %d\n",
1623 rpt->eid, rpt->credits);
1624
1625 endpoint->ep_st.tx_cred_rpt += 1;
1626 endpoint->ep_st.cred_retnd += rpt->credits;
1627
1628 if (from_ep == rpt->eid) {
1629 /*
1630 * This credit report arrived on the same endpoint
1631 * indicating it arrived in an RX packet.
1632 */
1633 endpoint->ep_st.cred_from_rx += rpt->credits;
1634 endpoint->ep_st.cred_rpt_from_rx += 1;
1635 } else if (from_ep == ENDPOINT_0) {
1636 /* credit arrived on endpoint 0 as a NULL message */
1637 endpoint->ep_st.cred_from_ep0 += rpt->credits;
1638 endpoint->ep_st.cred_rpt_ep0 += 1;
1639 } else {
1640 endpoint->ep_st.cred_from_other += rpt->credits;
1641 endpoint->ep_st.cred_rpt_from_other += 1;
1642 }
1643
1644 if (rpt->eid == ENDPOINT_0)
1645 /* always give endpoint 0 credits back */
1646 endpoint->cred_dist.credits += rpt->credits;
1647 else {
1648 endpoint->cred_dist.cred_to_dist += rpt->credits;
1649 dist = true;
1650 }
1651
1652 /*
1653 * Refresh tx depth for distribution function that will
1654 * recover these credits NOTE: this is only valid when
1655 * there are credits to recover!
1656 */
1657 endpoint->cred_dist.txq_depth =
1658 get_queue_depth(&endpoint->txq);
1659
1660 tot_credits += rpt->credits;
1661 }
1662
1663 if (dist) {
1664 /*
1665 * This was a credit return based on a completed send
1666 * operations note, this is done with the lock held
1667 */
1668 ath6kl_credit_distribute(target->credit_info,
1669 &target->cred_dist_list,
1670 HTC_CREDIT_DIST_SEND_COMPLETE);
1671 }
1672
1673 spin_unlock_bh(&target->tx_lock);
1674
1675 if (tot_credits)
1676 htc_chk_ep_txq(target);
1677 }
1678
1679 static int htc_parse_trailer(struct htc_target *target,
1680 struct htc_record_hdr *record,
1681 u8 *record_buf, u32 *next_lk_ahds,
1682 enum htc_endpoint_id endpoint,
1683 int *n_lk_ahds)
1684 {
1685 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt;
1686 struct htc_lookahead_report *lk_ahd;
1687 int len;
1688
1689 switch (record->rec_id) {
1690 case HTC_RECORD_CREDITS:
1691 len = record->len / sizeof(struct htc_credit_report);
1692 if (!len) {
1693 WARN_ON(1);
1694 return -EINVAL;
1695 }
1696
1697 htc_proc_cred_rpt(target,
1698 (struct htc_credit_report *) record_buf,
1699 len, endpoint);
1700 break;
1701 case HTC_RECORD_LOOKAHEAD:
1702 len = record->len / sizeof(*lk_ahd);
1703 if (!len) {
1704 WARN_ON(1);
1705 return -EINVAL;
1706 }
1707
1708 lk_ahd = (struct htc_lookahead_report *) record_buf;
1709 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) &&
1710 next_lk_ahds) {
1711
1712 ath6kl_dbg(ATH6KL_DBG_HTC,
1713 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n",
1714 lk_ahd->pre_valid, lk_ahd->post_valid);
1715
1716 /* look ahead bytes are valid, copy them over */
1717 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4);
1718
1719 ath6kl_dbg_dump(ATH6KL_DBG_HTC,
1720 "htc rx next look ahead",
1721 "", next_lk_ahds, 4);
1722
1723 *n_lk_ahds = 1;
1724 }
1725 break;
1726 case HTC_RECORD_LOOKAHEAD_BUNDLE:
1727 len = record->len / sizeof(*bundle_lkahd_rpt);
1728 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) {
1729 WARN_ON(1);
1730 return -EINVAL;
1731 }
1732
1733 if (next_lk_ahds) {
1734 int i;
1735
1736 bundle_lkahd_rpt =
1737 (struct htc_bundle_lkahd_rpt *) record_buf;
1738
1739 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd",
1740 "", record_buf, record->len);
1741
1742 for (i = 0; i < len; i++) {
1743 memcpy((u8 *)&next_lk_ahds[i],
1744 bundle_lkahd_rpt->lk_ahd, 4);
1745 bundle_lkahd_rpt++;
1746 }
1747
1748 *n_lk_ahds = i;
1749 }
1750 break;
1751 default:
1752 ath6kl_err("unhandled record: id:%d len:%d\n",
1753 record->rec_id, record->len);
1754 break;
1755 }
1756
1757 return 0;
1758
1759 }
1760
1761 static int htc_proc_trailer(struct htc_target *target,
1762 u8 *buf, int len, u32 *next_lk_ahds,
1763 int *n_lk_ahds, enum htc_endpoint_id endpoint)
1764 {
1765 struct htc_record_hdr *record;
1766 int orig_len;
1767 int status;
1768 u8 *record_buf;
1769 u8 *orig_buf;
1770
1771 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len);
1772 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len);
1773
1774 orig_buf = buf;
1775 orig_len = len;
1776 status = 0;
1777
1778 while (len > 0) {
1779
1780 if (len < sizeof(struct htc_record_hdr)) {
1781 status = -ENOMEM;
1782 break;
1783 }
1784 /* these are byte aligned structs */
1785 record = (struct htc_record_hdr *) buf;
1786 len -= sizeof(struct htc_record_hdr);
1787 buf += sizeof(struct htc_record_hdr);
1788
1789 if (record->len > len) {
1790 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n",
1791 record->len, record->rec_id, len);
1792 status = -ENOMEM;
1793 break;
1794 }
1795 record_buf = buf;
1796
1797 status = htc_parse_trailer(target, record, record_buf,
1798 next_lk_ahds, endpoint, n_lk_ahds);
1799
1800 if (status)
1801 break;
1802
1803 /* advance buffer past this record for next time around */
1804 buf += record->len;
1805 len -= record->len;
1806 }
1807
1808 if (status)
1809 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer",
1810 "", orig_buf, orig_len);
1811
1812 return status;
1813 }
1814
1815 static int ath6kl_htc_rx_process_hdr(struct htc_target *target,
1816 struct htc_packet *packet,
1817 u32 *next_lkahds, int *n_lkahds)
1818 {
1819 int status = 0;
1820 u16 payload_len;
1821 u32 lk_ahd;
1822 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf;
1823
1824 if (n_lkahds != NULL)
1825 *n_lkahds = 0;
1826
1827 /*
1828 * NOTE: we cannot assume the alignment of buf, so we use the safe
1829 * macros to retrieve 16 bit fields.
1830 */
1831 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len));
1832
1833 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd));
1834
1835 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) {
1836 /*
1837 * Refresh the expected header and the actual length as it
1838 * was unknown when this packet was grabbed as part of the
1839 * bundle.
1840 */
1841 packet->info.rx.exp_hdr = lk_ahd;
1842 packet->act_len = payload_len + HTC_HDR_LENGTH;
1843
1844 /* validate the actual header that was refreshed */
1845 if (packet->act_len > packet->buf_len) {
1846 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n",
1847 payload_len, lk_ahd);
1848 /*
1849 * Limit this to max buffer just to print out some
1850 * of the buffer.
1851 */
1852 packet->act_len = min(packet->act_len, packet->buf_len);
1853 status = -ENOMEM;
1854 goto fail_rx;
1855 }
1856
1857 if (packet->endpoint != htc_hdr->eid) {
1858 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n",
1859 htc_hdr->eid, packet->endpoint);
1860 status = -ENOMEM;
1861 goto fail_rx;
1862 }
1863 }
1864
1865 if (lk_ahd != packet->info.rx.exp_hdr) {
1866 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n",
1867 __func__, packet, packet->info.rx.rx_flags);
1868 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd",
1869 "", &packet->info.rx.exp_hdr, 4);
1870 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header",
1871 "", (u8 *)&lk_ahd, sizeof(lk_ahd));
1872 status = -ENOMEM;
1873 goto fail_rx;
1874 }
1875
1876 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) {
1877 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) ||
1878 htc_hdr->ctrl[0] > payload_len) {
1879 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n",
1880 __func__, payload_len, htc_hdr->ctrl[0]);
1881 status = -ENOMEM;
1882 goto fail_rx;
1883 }
1884
1885 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) {
1886 next_lkahds = NULL;
1887 n_lkahds = NULL;
1888 }
1889
1890 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH
1891 + payload_len - htc_hdr->ctrl[0],
1892 htc_hdr->ctrl[0], next_lkahds,
1893 n_lkahds, packet->endpoint);
1894
1895 if (status)
1896 goto fail_rx;
1897
1898 packet->act_len -= htc_hdr->ctrl[0];
1899 }
1900
1901 packet->buf += HTC_HDR_LENGTH;
1902 packet->act_len -= HTC_HDR_LENGTH;
1903
1904 fail_rx:
1905 if (status)
1906 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet",
1907 "", packet->buf, packet->act_len);
1908
1909 return status;
1910 }
1911
1912 static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint,
1913 struct htc_packet *packet)
1914 {
1915 ath6kl_dbg(ATH6KL_DBG_HTC,
1916 "htc rx complete ep %d packet 0x%p\n",
1917 endpoint->eid, packet);
1918
1919 endpoint->ep_cb.rx(endpoint->target, packet);
1920 }
1921
1922 static int ath6kl_htc_rx_bundle(struct htc_target *target,
1923 struct list_head *rxq,
1924 struct list_head *sync_compq,
1925 int *n_pkt_fetched, bool part_bundle)
1926 {
1927 struct hif_scatter_req *scat_req;
1928 struct htc_packet *packet;
1929 int rem_space = target->max_rx_bndl_sz;
1930 int n_scat_pkt, status = 0, i, len;
1931
1932 n_scat_pkt = get_queue_depth(rxq);
1933 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max);
1934
1935 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) {
1936 /*
1937 * We were forced to split this bundle receive operation
1938 * all packets in this partial bundle must have their
1939 * lookaheads ignored.
1940 */
1941 part_bundle = true;
1942
1943 /*
1944 * This would only happen if the target ignored our max
1945 * bundle limit.
1946 */
1947 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n",
1948 __func__, get_queue_depth(rxq), n_scat_pkt);
1949 }
1950
1951 len = 0;
1952
1953 ath6kl_dbg(ATH6KL_DBG_HTC,
1954 "htc rx bundle depth %d pkts %d\n",
1955 get_queue_depth(rxq), n_scat_pkt);
1956
1957 scat_req = hif_scatter_req_get(target->dev->ar);
1958
1959 if (scat_req == NULL)
1960 goto fail_rx_pkt;
1961
1962 for (i = 0; i < n_scat_pkt; i++) {
1963 int pad_len;
1964
1965 packet = list_first_entry(rxq, struct htc_packet, list);
1966 list_del(&packet->list);
1967
1968 pad_len = CALC_TXRX_PADDED_LEN(target,
1969 packet->act_len);
1970
1971 if ((rem_space - pad_len) < 0) {
1972 list_add(&packet->list, rxq);
1973 break;
1974 }
1975
1976 rem_space -= pad_len;
1977
1978 if (part_bundle || (i < (n_scat_pkt - 1)))
1979 /*
1980 * Packet 0..n-1 cannot be checked for look-aheads
1981 * since we are fetching a bundle the last packet
1982 * however can have it's lookahead used
1983 */
1984 packet->info.rx.rx_flags |=
1985 HTC_RX_PKT_IGNORE_LOOKAHEAD;
1986
1987 /* NOTE: 1 HTC packet per scatter entry */
1988 scat_req->scat_list[i].buf = packet->buf;
1989 scat_req->scat_list[i].len = pad_len;
1990
1991 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE;
1992
1993 list_add_tail(&packet->list, sync_compq);
1994
1995 WARN_ON(!scat_req->scat_list[i].len);
1996 len += scat_req->scat_list[i].len;
1997 }
1998
1999 scat_req->len = len;
2000 scat_req->scat_entries = i;
2001
2002 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true);
2003
2004 if (!status)
2005 *n_pkt_fetched = i;
2006
2007 /* free scatter request */
2008 hif_scatter_req_add(target->dev->ar, scat_req);
2009
2010 fail_rx_pkt:
2011
2012 return status;
2013 }
2014
2015 static int ath6kl_htc_rx_process_packets(struct htc_target *target,
2016 struct list_head *comp_pktq,
2017 u32 lk_ahds[],
2018 int *n_lk_ahd)
2019 {
2020 struct htc_packet *packet, *tmp_pkt;
2021 struct htc_endpoint *ep;
2022 int status = 0;
2023
2024 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) {
2025 ep = &target->endpoint[packet->endpoint];
2026
2027 trace_ath6kl_htc_rx(packet->status, packet->endpoint,
2028 packet->buf, packet->act_len);
2029
2030 /* process header for each of the recv packet */
2031 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds,
2032 n_lk_ahd);
2033 if (status)
2034 return status;
2035
2036 list_del(&packet->list);
2037
2038 if (list_empty(comp_pktq)) {
2039 /*
2040 * Last packet's more packet flag is set
2041 * based on the lookahead.
2042 */
2043 if (*n_lk_ahd > 0)
2044 ath6kl_htc_rx_set_indicate(lk_ahds[0],
2045 ep, packet);
2046 } else
2047 /*
2048 * Packets in a bundle automatically have
2049 * this flag set.
2050 */
2051 packet->info.rx.indicat_flags |=
2052 HTC_RX_FLAGS_INDICATE_MORE_PKTS;
2053
2054 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd);
2055
2056 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE)
2057 ep->ep_st.rx_bundl += 1;
2058
2059 ath6kl_htc_rx_complete(ep, packet);
2060 }
2061
2062 return status;
2063 }
2064
2065 static int ath6kl_htc_rx_fetch(struct htc_target *target,
2066 struct list_head *rx_pktq,
2067 struct list_head *comp_pktq)
2068 {
2069 int fetched_pkts;
2070 bool part_bundle = false;
2071 int status = 0;
2072 struct list_head tmp_rxq;
2073 struct htc_packet *packet, *tmp_pkt;
2074
2075 /* now go fetch the list of HTC packets */
2076 while (!list_empty(rx_pktq)) {
2077 fetched_pkts = 0;
2078
2079 INIT_LIST_HEAD(&tmp_rxq);
2080
2081 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) {
2082 /*
2083 * There are enough packets to attempt a
2084 * bundle transfer and recv bundling is
2085 * allowed.
2086 */
2087 status = ath6kl_htc_rx_bundle(target, rx_pktq,
2088 &tmp_rxq,
2089 &fetched_pkts,
2090 part_bundle);
2091 if (status)
2092 goto fail_rx;
2093
2094 if (!list_empty(rx_pktq))
2095 part_bundle = true;
2096
2097 list_splice_tail_init(&tmp_rxq, comp_pktq);
2098 }
2099
2100 if (!fetched_pkts) {
2101
2102 packet = list_first_entry(rx_pktq, struct htc_packet,
2103 list);
2104
2105 /* fully synchronous */
2106 packet->completion = NULL;
2107
2108 if (!list_is_singular(rx_pktq))
2109 /*
2110 * look_aheads in all packet
2111 * except the last one in the
2112 * bundle must be ignored
2113 */
2114 packet->info.rx.rx_flags |=
2115 HTC_RX_PKT_IGNORE_LOOKAHEAD;
2116
2117 /* go fetch the packet */
2118 status = ath6kl_htc_rx_packet(target, packet,
2119 packet->act_len);
2120
2121 list_move_tail(&packet->list, &tmp_rxq);
2122
2123 if (status)
2124 goto fail_rx;
2125
2126 list_splice_tail_init(&tmp_rxq, comp_pktq);
2127 }
2128 }
2129
2130 return 0;
2131
2132 fail_rx:
2133
2134 /*
2135 * Cleanup any packets we allocated but didn't use to
2136 * actually fetch any packets.
2137 */
2138
2139 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) {
2140 list_del(&packet->list);
2141 htc_reclaim_rxbuf(target, packet,
2142 &target->endpoint[packet->endpoint]);
2143 }
2144
2145 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) {
2146 list_del(&packet->list);
2147 htc_reclaim_rxbuf(target, packet,
2148 &target->endpoint[packet->endpoint]);
2149 }
2150
2151 return status;
2152 }
2153
2154 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
2155 u32 msg_look_ahead, int *num_pkts)
2156 {
2157 struct htc_packet *packets, *tmp_pkt;
2158 struct htc_endpoint *endpoint;
2159 struct list_head rx_pktq, comp_pktq;
2160 int status = 0;
2161 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE];
2162 int num_look_ahead = 1;
2163 enum htc_endpoint_id id;
2164 int n_fetched = 0;
2165
2166 INIT_LIST_HEAD(&comp_pktq);
2167 *num_pkts = 0;
2168
2169 /*
2170 * On first entry copy the look_aheads into our temp array for
2171 * processing
2172 */
2173 look_aheads[0] = msg_look_ahead;
2174
2175 while (true) {
2176
2177 /*
2178 * First lookahead sets the expected endpoint IDs for all
2179 * packets in a bundle.
2180 */
2181 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid;
2182 endpoint = &target->endpoint[id];
2183
2184 if (id >= ENDPOINT_MAX) {
2185 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n",
2186 id);
2187 status = -ENOMEM;
2188 break;
2189 }
2190
2191 INIT_LIST_HEAD(&rx_pktq);
2192 INIT_LIST_HEAD(&comp_pktq);
2193
2194 /*
2195 * Try to allocate as many HTC RX packets indicated by the
2196 * look_aheads.
2197 */
2198 status = ath6kl_htc_rx_alloc(target, look_aheads,
2199 num_look_ahead, endpoint,
2200 &rx_pktq);
2201 if (status)
2202 break;
2203
2204 if (get_queue_depth(&rx_pktq) >= 2)
2205 /*
2206 * A recv bundle was detected, force IRQ status
2207 * re-check again
2208 */
2209 target->chk_irq_status_cnt = 1;
2210
2211 n_fetched += get_queue_depth(&rx_pktq);
2212
2213 num_look_ahead = 0;
2214
2215 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq);
2216
2217 if (!status)
2218 ath6kl_htc_rx_chk_water_mark(endpoint);
2219
2220 /* Process fetched packets */
2221 status = ath6kl_htc_rx_process_packets(target, &comp_pktq,
2222 look_aheads,
2223 &num_look_ahead);
2224
2225 if (!num_look_ahead || status)
2226 break;
2227
2228 /*
2229 * For SYNCH processing, if we get here, we are running
2230 * through the loop again due to a detected lookahead. Set
2231 * flag that we should re-check IRQ status registers again
2232 * before leaving IRQ processing, this can net better
2233 * performance in high throughput situations.
2234 */
2235 target->chk_irq_status_cnt = 1;
2236 }
2237
2238 if (status) {
2239 ath6kl_err("failed to get pending recv messages: %d\n",
2240 status);
2241
2242 /* cleanup any packets in sync completion queue */
2243 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) {
2244 list_del(&packets->list);
2245 htc_reclaim_rxbuf(target, packets,
2246 &target->endpoint[packets->endpoint]);
2247 }
2248
2249 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2250 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n");
2251 ath6kl_hif_rx_control(target->dev, false);
2252 }
2253 }
2254
2255 /*
2256 * Before leaving, check to see if host ran out of buffers and
2257 * needs to stop the receiver.
2258 */
2259 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2260 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n");
2261 ath6kl_hif_rx_control(target->dev, false);
2262 }
2263 *num_pkts = n_fetched;
2264
2265 return status;
2266 }
2267
2268 /*
2269 * Synchronously wait for a control message from the target,
2270 * This function is used at initialization time ONLY. At init messages
2271 * on ENDPOINT 0 are expected.
2272 */
2273 static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target)
2274 {
2275 struct htc_packet *packet = NULL;
2276 struct htc_frame_hdr *htc_hdr;
2277 u32 look_ahead;
2278
2279 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead,
2280 HTC_TARGET_RESPONSE_TIMEOUT))
2281 return NULL;
2282
2283 ath6kl_dbg(ATH6KL_DBG_HTC,
2284 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead);
2285
2286 htc_hdr = (struct htc_frame_hdr *)&look_ahead;
2287
2288 if (htc_hdr->eid != ENDPOINT_0)
2289 return NULL;
2290
2291 packet = htc_get_control_buf(target, false);
2292
2293 if (!packet)
2294 return NULL;
2295
2296 packet->info.rx.rx_flags = 0;
2297 packet->info.rx.exp_hdr = look_ahead;
2298 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH;
2299
2300 if (packet->act_len > packet->buf_len)
2301 goto fail_ctrl_rx;
2302
2303 /* we want synchronous operation */
2304 packet->completion = NULL;
2305
2306 /* get the message from the device, this will block */
2307 if (ath6kl_htc_rx_packet(target, packet, packet->act_len))
2308 goto fail_ctrl_rx;
2309
2310 trace_ath6kl_htc_rx(packet->status, packet->endpoint,
2311 packet->buf, packet->act_len);
2312
2313 /* process receive header */
2314 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL);
2315
2316 if (packet->status) {
2317 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n",
2318 packet->status);
2319 goto fail_ctrl_rx;
2320 }
2321
2322 return packet;
2323
2324 fail_ctrl_rx:
2325 if (packet != NULL) {
2326 htc_rxpkt_reset(packet);
2327 reclaim_rx_ctrl_buf(target, packet);
2328 }
2329
2330 return NULL;
2331 }
2332
2333 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target,
2334 struct list_head *pkt_queue)
2335 {
2336 struct htc_endpoint *endpoint;
2337 struct htc_packet *first_pkt;
2338 bool rx_unblock = false;
2339 int status = 0, depth;
2340
2341 if (list_empty(pkt_queue))
2342 return -ENOMEM;
2343
2344 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list);
2345
2346 if (first_pkt->endpoint >= ENDPOINT_MAX)
2347 return status;
2348
2349 depth = get_queue_depth(pkt_queue);
2350
2351 ath6kl_dbg(ATH6KL_DBG_HTC,
2352 "htc rx add multiple ep id %d cnt %d len %d\n",
2353 first_pkt->endpoint, depth, first_pkt->buf_len);
2354
2355 endpoint = &target->endpoint[first_pkt->endpoint];
2356
2357 if (target->htc_flags & HTC_OP_STATE_STOPPING) {
2358 struct htc_packet *packet, *tmp_pkt;
2359
2360 /* walk through queue and mark each one canceled */
2361 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
2362 packet->status = -ECANCELED;
2363 list_del(&packet->list);
2364 ath6kl_htc_rx_complete(endpoint, packet);
2365 }
2366
2367 return status;
2368 }
2369
2370 spin_lock_bh(&target->rx_lock);
2371
2372 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq);
2373
2374 /* check if we are blocked waiting for a new buffer */
2375 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
2376 if (target->ep_waiting == first_pkt->endpoint) {
2377 ath6kl_dbg(ATH6KL_DBG_HTC,
2378 "htc rx blocked on ep %d, unblocking\n",
2379 target->ep_waiting);
2380 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS;
2381 target->ep_waiting = ENDPOINT_MAX;
2382 rx_unblock = true;
2383 }
2384 }
2385
2386 spin_unlock_bh(&target->rx_lock);
2387
2388 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING))
2389 /* TODO : implement a buffer threshold count? */
2390 ath6kl_hif_rx_control(target->dev, true);
2391
2392 return status;
2393 }
2394
2395 static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target)
2396 {
2397 struct htc_endpoint *endpoint;
2398 struct htc_packet *packet, *tmp_pkt;
2399 int i;
2400
2401 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2402 endpoint = &target->endpoint[i];
2403 if (!endpoint->svc_id)
2404 /* not in use.. */
2405 continue;
2406
2407 spin_lock_bh(&target->rx_lock);
2408 list_for_each_entry_safe(packet, tmp_pkt,
2409 &endpoint->rx_bufq, list) {
2410 list_del(&packet->list);
2411 spin_unlock_bh(&target->rx_lock);
2412 ath6kl_dbg(ATH6KL_DBG_HTC,
2413 "htc rx flush pkt 0x%p len %d ep %d\n",
2414 packet, packet->buf_len,
2415 packet->endpoint);
2416 /*
2417 * packets in rx_bufq of endpoint 0 have originally
2418 * been queued from target->free_ctrl_rxbuf where
2419 * packet and packet->buf_start are allocated
2420 * separately using kmalloc(). For other endpoint
2421 * rx_bufq, it is allocated as skb where packet is
2422 * skb->head. Take care of this difference while freeing
2423 * the memory.
2424 */
2425 if (packet->endpoint == ENDPOINT_0) {
2426 kfree(packet->buf_start);
2427 kfree(packet);
2428 } else {
2429 dev_kfree_skb(packet->pkt_cntxt);
2430 }
2431 spin_lock_bh(&target->rx_lock);
2432 }
2433 spin_unlock_bh(&target->rx_lock);
2434 }
2435 }
2436
2437 static int ath6kl_htc_mbox_conn_service(struct htc_target *target,
2438 struct htc_service_connect_req *conn_req,
2439 struct htc_service_connect_resp *conn_resp)
2440 {
2441 struct htc_packet *rx_pkt = NULL;
2442 struct htc_packet *tx_pkt = NULL;
2443 struct htc_conn_service_resp *resp_msg;
2444 struct htc_conn_service_msg *conn_msg;
2445 struct htc_endpoint *endpoint;
2446 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX;
2447 unsigned int max_msg_sz = 0;
2448 int status = 0;
2449 u16 msg_id;
2450
2451 ath6kl_dbg(ATH6KL_DBG_HTC,
2452 "htc connect service target 0x%p service id 0x%x\n",
2453 target, conn_req->svc_id);
2454
2455 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) {
2456 /* special case for pseudo control service */
2457 assigned_ep = ENDPOINT_0;
2458 max_msg_sz = HTC_MAX_CTRL_MSG_LEN;
2459 } else {
2460 /* allocate a packet to send to the target */
2461 tx_pkt = htc_get_control_buf(target, true);
2462
2463 if (!tx_pkt)
2464 return -ENOMEM;
2465
2466 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf;
2467 memset(conn_msg, 0, sizeof(*conn_msg));
2468 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID);
2469 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id);
2470 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags);
2471
2472 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg,
2473 sizeof(*conn_msg) + conn_msg->svc_meta_len,
2474 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
2475
2476 /* we want synchronous operation */
2477 tx_pkt->completion = NULL;
2478 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0);
2479 status = ath6kl_htc_tx_issue(target, tx_pkt);
2480
2481 if (status)
2482 goto fail_tx;
2483
2484 /* wait for response */
2485 rx_pkt = htc_wait_for_ctrl_msg(target);
2486
2487 if (!rx_pkt) {
2488 status = -ENOMEM;
2489 goto fail_tx;
2490 }
2491
2492 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf;
2493 msg_id = le16_to_cpu(resp_msg->msg_id);
2494
2495 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) ||
2496 (rx_pkt->act_len < sizeof(*resp_msg))) {
2497 status = -ENOMEM;
2498 goto fail_tx;
2499 }
2500
2501 conn_resp->resp_code = resp_msg->status;
2502 /* check response status */
2503 if (resp_msg->status != HTC_SERVICE_SUCCESS) {
2504 ath6kl_err("target failed service 0x%X connect request (status:%d)\n",
2505 resp_msg->svc_id, resp_msg->status);
2506 status = -ENOMEM;
2507 goto fail_tx;
2508 }
2509
2510 assigned_ep = (enum htc_endpoint_id)resp_msg->eid;
2511 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz);
2512 }
2513
2514 if (WARN_ON_ONCE(assigned_ep == ENDPOINT_UNUSED ||
2515 assigned_ep >= ENDPOINT_MAX || !max_msg_sz)) {
2516 status = -ENOMEM;
2517 goto fail_tx;
2518 }
2519
2520 endpoint = &target->endpoint[assigned_ep];
2521 endpoint->eid = assigned_ep;
2522 if (endpoint->svc_id) {
2523 status = -ENOMEM;
2524 goto fail_tx;
2525 }
2526
2527 /* return assigned endpoint to caller */
2528 conn_resp->endpoint = assigned_ep;
2529 conn_resp->len_max = max_msg_sz;
2530
2531 /* setup the endpoint */
2532
2533 /* this marks the endpoint in use */
2534 endpoint->svc_id = conn_req->svc_id;
2535
2536 endpoint->max_txq_depth = conn_req->max_txq_depth;
2537 endpoint->len_max = max_msg_sz;
2538 endpoint->ep_cb = conn_req->ep_cb;
2539 endpoint->cred_dist.svc_id = conn_req->svc_id;
2540 endpoint->cred_dist.htc_ep = endpoint;
2541 endpoint->cred_dist.endpoint = assigned_ep;
2542 endpoint->cred_dist.cred_sz = target->tgt_cred_sz;
2543
2544 switch (endpoint->svc_id) {
2545 case WMI_DATA_BK_SVC:
2546 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3;
2547 break;
2548 default:
2549 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM;
2550 break;
2551 }
2552
2553 if (conn_req->max_rxmsg_sz) {
2554 /*
2555 * Override cred_per_msg calculation, this optimizes
2556 * the credit-low indications since the host will actually
2557 * issue smaller messages in the Send path.
2558 */
2559 if (conn_req->max_rxmsg_sz > max_msg_sz) {
2560 status = -ENOMEM;
2561 goto fail_tx;
2562 }
2563 endpoint->cred_dist.cred_per_msg =
2564 conn_req->max_rxmsg_sz / target->tgt_cred_sz;
2565 } else
2566 endpoint->cred_dist.cred_per_msg =
2567 max_msg_sz / target->tgt_cred_sz;
2568
2569 if (!endpoint->cred_dist.cred_per_msg)
2570 endpoint->cred_dist.cred_per_msg = 1;
2571
2572 /* save local connection flags */
2573 endpoint->conn_flags = conn_req->flags;
2574
2575 fail_tx:
2576 if (tx_pkt)
2577 htc_reclaim_txctrl_buf(target, tx_pkt);
2578
2579 if (rx_pkt) {
2580 htc_rxpkt_reset(rx_pkt);
2581 reclaim_rx_ctrl_buf(target, rx_pkt);
2582 }
2583
2584 return status;
2585 }
2586
2587 static void reset_ep_state(struct htc_target *target)
2588 {
2589 struct htc_endpoint *endpoint;
2590 int i;
2591
2592 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
2593 endpoint = &target->endpoint[i];
2594 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist));
2595 endpoint->svc_id = 0;
2596 endpoint->len_max = 0;
2597 endpoint->max_txq_depth = 0;
2598 memset(&endpoint->ep_st, 0,
2599 sizeof(endpoint->ep_st));
2600 INIT_LIST_HEAD(&endpoint->rx_bufq);
2601 INIT_LIST_HEAD(&endpoint->txq);
2602 endpoint->target = target;
2603 }
2604
2605 /* reset distribution list */
2606 /* FIXME: free existing entries */
2607 INIT_LIST_HEAD(&target->cred_dist_list);
2608 }
2609
2610 static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target,
2611 enum htc_endpoint_id endpoint)
2612 {
2613 int num;
2614
2615 spin_lock_bh(&target->rx_lock);
2616 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq));
2617 spin_unlock_bh(&target->rx_lock);
2618 return num;
2619 }
2620
2621 static void htc_setup_msg_bndl(struct htc_target *target)
2622 {
2623 /* limit what HTC can handle */
2624 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE,
2625 target->msg_per_bndl_max);
2626
2627 if (ath6kl_hif_enable_scatter(target->dev->ar)) {
2628 target->msg_per_bndl_max = 0;
2629 return;
2630 }
2631
2632 /* limit bundle what the device layer can handle */
2633 target->msg_per_bndl_max = min(target->max_scat_entries,
2634 target->msg_per_bndl_max);
2635
2636 ath6kl_dbg(ATH6KL_DBG_BOOT,
2637 "htc bundling allowed msg_per_bndl_max %d\n",
2638 target->msg_per_bndl_max);
2639
2640 /* Max rx bundle size is limited by the max tx bundle size */
2641 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq;
2642 /* Max tx bundle size if limited by the extended mbox address range */
2643 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH,
2644 target->max_xfer_szper_scatreq);
2645
2646 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n",
2647 target->max_rx_bndl_sz, target->max_tx_bndl_sz);
2648
2649 if (target->max_tx_bndl_sz)
2650 /* tx_bndl_mask is enabled per AC, each has 1 bit */
2651 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1;
2652
2653 if (target->max_rx_bndl_sz)
2654 target->rx_bndl_enable = true;
2655
2656 if ((target->tgt_cred_sz % target->block_sz) != 0) {
2657 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n",
2658 target->tgt_cred_sz);
2659
2660 /*
2661 * Disallow send bundling since the credit size is
2662 * not aligned to a block size the I/O block
2663 * padding will spill into the next credit buffer
2664 * which is fatal.
2665 */
2666 target->tx_bndl_mask = 0;
2667 }
2668 }
2669
2670 static int ath6kl_htc_mbox_wait_target(struct htc_target *target)
2671 {
2672 struct htc_packet *packet = NULL;
2673 struct htc_ready_ext_msg *rdy_msg;
2674 struct htc_service_connect_req connect;
2675 struct htc_service_connect_resp resp;
2676 int status;
2677
2678 /* we should be getting 1 control message that the target is ready */
2679 packet = htc_wait_for_ctrl_msg(target);
2680
2681 if (!packet)
2682 return -ENOMEM;
2683
2684 /* we controlled the buffer creation so it's properly aligned */
2685 rdy_msg = (struct htc_ready_ext_msg *)packet->buf;
2686
2687 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) ||
2688 (packet->act_len < sizeof(struct htc_ready_msg))) {
2689 status = -ENOMEM;
2690 goto fail_wait_target;
2691 }
2692
2693 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) {
2694 status = -ENOMEM;
2695 goto fail_wait_target;
2696 }
2697
2698 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt);
2699 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz);
2700
2701 ath6kl_dbg(ATH6KL_DBG_BOOT,
2702 "htc target ready credits %d size %d\n",
2703 target->tgt_creds, target->tgt_cred_sz);
2704
2705 /* check if this is an extended ready message */
2706 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) {
2707 /* this is an extended message */
2708 target->htc_tgt_ver = rdy_msg->htc_ver;
2709 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl;
2710 } else {
2711 /* legacy */
2712 target->htc_tgt_ver = HTC_VERSION_2P0;
2713 target->msg_per_bndl_max = 0;
2714 }
2715
2716 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n",
2717 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1",
2718 target->htc_tgt_ver);
2719
2720 if (target->msg_per_bndl_max > 0)
2721 htc_setup_msg_bndl(target);
2722
2723 /* setup our pseudo HTC control endpoint connection */
2724 memset(&connect, 0, sizeof(connect));
2725 memset(&resp, 0, sizeof(resp));
2726 connect.ep_cb.rx = htc_ctrl_rx;
2727 connect.ep_cb.rx_refill = NULL;
2728 connect.ep_cb.tx_full = NULL;
2729 connect.max_txq_depth = NUM_CONTROL_BUFFERS;
2730 connect.svc_id = HTC_CTRL_RSVD_SVC;
2731
2732 /* connect fake service */
2733 status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp);
2734
2735 if (status)
2736 /*
2737 * FIXME: this call doesn't make sense, the caller should
2738 * call ath6kl_htc_mbox_cleanup() when it wants remove htc
2739 */
2740 ath6kl_hif_cleanup_scatter(target->dev->ar);
2741
2742 fail_wait_target:
2743 if (packet) {
2744 htc_rxpkt_reset(packet);
2745 reclaim_rx_ctrl_buf(target, packet);
2746 }
2747
2748 return status;
2749 }
2750
2751 /*
2752 * Start HTC, enable interrupts and let the target know
2753 * host has finished setup.
2754 */
2755 static int ath6kl_htc_mbox_start(struct htc_target *target)
2756 {
2757 struct htc_packet *packet;
2758 int status;
2759
2760 memset(&target->dev->irq_proc_reg, 0,
2761 sizeof(target->dev->irq_proc_reg));
2762
2763 /* Disable interrupts at the chip level */
2764 ath6kl_hif_disable_intrs(target->dev);
2765
2766 target->htc_flags = 0;
2767 target->rx_st_flags = 0;
2768
2769 /* Push control receive buffers into htc control endpoint */
2770 while ((packet = htc_get_control_buf(target, false)) != NULL) {
2771 status = htc_add_rxbuf(target, packet);
2772 if (status)
2773 return status;
2774 }
2775
2776 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */
2777 ath6kl_credit_init(target->credit_info, &target->cred_dist_list,
2778 target->tgt_creds);
2779
2780 dump_cred_dist_stats(target);
2781
2782 /* Indicate to the target of the setup completion */
2783 status = htc_setup_tx_complete(target);
2784
2785 if (status)
2786 return status;
2787
2788 /* unmask interrupts */
2789 status = ath6kl_hif_unmask_intrs(target->dev);
2790
2791 if (status)
2792 ath6kl_htc_mbox_stop(target);
2793
2794 return status;
2795 }
2796
2797 static int ath6kl_htc_reset(struct htc_target *target)
2798 {
2799 u32 block_size, ctrl_bufsz;
2800 struct htc_packet *packet;
2801 int i;
2802
2803 reset_ep_state(target);
2804
2805 block_size = target->dev->ar->mbox_info.block_size;
2806
2807 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ?
2808 (block_size + HTC_HDR_LENGTH) :
2809 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH);
2810
2811 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) {
2812 packet = kzalloc(sizeof(*packet), GFP_KERNEL);
2813 if (!packet)
2814 return -ENOMEM;
2815
2816 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL);
2817 if (!packet->buf_start) {
2818 kfree(packet);
2819 return -ENOMEM;
2820 }
2821
2822 packet->buf_len = ctrl_bufsz;
2823 if (i < NUM_CONTROL_RX_BUFFERS) {
2824 packet->act_len = 0;
2825 packet->buf = packet->buf_start;
2826 packet->endpoint = ENDPOINT_0;
2827 list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
2828 } else
2829 list_add_tail(&packet->list, &target->free_ctrl_txbuf);
2830 }
2831
2832 return 0;
2833 }
2834
2835 /* htc_stop: stop interrupt reception, and flush all queued buffers */
2836 static void ath6kl_htc_mbox_stop(struct htc_target *target)
2837 {
2838 spin_lock_bh(&target->htc_lock);
2839 target->htc_flags |= HTC_OP_STATE_STOPPING;
2840 spin_unlock_bh(&target->htc_lock);
2841
2842 /*
2843 * Masking interrupts is a synchronous operation, when this
2844 * function returns all pending HIF I/O has completed, we can
2845 * safely flush the queues.
2846 */
2847 ath6kl_hif_mask_intrs(target->dev);
2848
2849 ath6kl_htc_flush_txep_all(target);
2850
2851 ath6kl_htc_mbox_flush_rx_buf(target);
2852
2853 ath6kl_htc_reset(target);
2854 }
2855
2856 static void *ath6kl_htc_mbox_create(struct ath6kl *ar)
2857 {
2858 struct htc_target *target = NULL;
2859 int status = 0;
2860
2861 target = kzalloc(sizeof(*target), GFP_KERNEL);
2862 if (!target) {
2863 ath6kl_err("unable to allocate memory\n");
2864 return NULL;
2865 }
2866
2867 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL);
2868 if (!target->dev) {
2869 ath6kl_err("unable to allocate memory\n");
2870 status = -ENOMEM;
2871 goto err_htc_cleanup;
2872 }
2873
2874 spin_lock_init(&target->htc_lock);
2875 spin_lock_init(&target->rx_lock);
2876 spin_lock_init(&target->tx_lock);
2877
2878 INIT_LIST_HEAD(&target->free_ctrl_txbuf);
2879 INIT_LIST_HEAD(&target->free_ctrl_rxbuf);
2880 INIT_LIST_HEAD(&target->cred_dist_list);
2881
2882 target->dev->ar = ar;
2883 target->dev->htc_cnxt = target;
2884 target->ep_waiting = ENDPOINT_MAX;
2885
2886 status = ath6kl_hif_setup(target->dev);
2887 if (status)
2888 goto err_htc_cleanup;
2889
2890 status = ath6kl_htc_reset(target);
2891 if (status)
2892 goto err_htc_cleanup;
2893
2894 return target;
2895
2896 err_htc_cleanup:
2897 ath6kl_htc_mbox_cleanup(target);
2898
2899 return NULL;
2900 }
2901
2902 /* cleanup the HTC instance */
2903 static void ath6kl_htc_mbox_cleanup(struct htc_target *target)
2904 {
2905 struct htc_packet *packet, *tmp_packet;
2906
2907 ath6kl_hif_cleanup_scatter(target->dev->ar);
2908
2909 list_for_each_entry_safe(packet, tmp_packet,
2910 &target->free_ctrl_txbuf, list) {
2911 list_del(&packet->list);
2912 kfree(packet->buf_start);
2913 kfree(packet);
2914 }
2915
2916 list_for_each_entry_safe(packet, tmp_packet,
2917 &target->free_ctrl_rxbuf, list) {
2918 list_del(&packet->list);
2919 kfree(packet->buf_start);
2920 kfree(packet);
2921 }
2922
2923 kfree(target->dev);
2924 kfree(target);
2925 }
2926
2927 static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = {
2928 .create = ath6kl_htc_mbox_create,
2929 .wait_target = ath6kl_htc_mbox_wait_target,
2930 .start = ath6kl_htc_mbox_start,
2931 .conn_service = ath6kl_htc_mbox_conn_service,
2932 .tx = ath6kl_htc_mbox_tx,
2933 .stop = ath6kl_htc_mbox_stop,
2934 .cleanup = ath6kl_htc_mbox_cleanup,
2935 .flush_txep = ath6kl_htc_mbox_flush_txep,
2936 .flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf,
2937 .activity_changed = ath6kl_htc_mbox_activity_changed,
2938 .get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num,
2939 .add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple,
2940 .credit_setup = ath6kl_htc_mbox_credit_setup,
2941 };
2942
2943 void ath6kl_htc_mbox_attach(struct ath6kl *ar)
2944 {
2945 ar->htc_ops = &ath6kl_htc_mbox_ops;
2946 }
Linux with added FPC-III support