1 /* 2 * Copyright (c) 2007-2011 Atheros Communications Inc. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include "core.h" 18 #include "debug.h" 19 #include "hif-ops.h" 20 21 #define HTC_PACKET_CONTAINER_ALLOCATION 32 22 #define HTC_CONTROL_BUFFER_SIZE (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH) 23 24 static int ath6kl_htc_pipe_tx(struct htc_target *handle, 25 struct htc_packet *packet); 26 static void ath6kl_htc_pipe_cleanup(struct htc_target *handle); 27 28 /* htc pipe tx path */ 29 static inline void restore_tx_packet(struct htc_packet *packet) 30 { 31 if (packet->info.tx.flags & HTC_FLAGS_TX_FIXUP_NETBUF) { 32 skb_pull(packet->skb, sizeof(struct htc_frame_hdr)); 33 packet->info.tx.flags &= ~HTC_FLAGS_TX_FIXUP_NETBUF; 34 } 35 } 36 37 static void do_send_completion(struct htc_endpoint *ep, 38 struct list_head *queue_to_indicate) 39 { 40 struct htc_packet *packet; 41 42 if (list_empty(queue_to_indicate)) { 43 /* nothing to indicate */ 44 return; 45 } 46 47 if (ep->ep_cb.tx_comp_multi != NULL) { 48 ath6kl_dbg(ATH6KL_DBG_HTC, 49 "%s: calling ep %d, send complete multiple callback (%d pkts)\n", 50 __func__, ep->eid, 51 get_queue_depth(queue_to_indicate)); 52 /* 53 * a multiple send complete handler is being used, 54 * pass the queue to the handler 55 */ 56 ep->ep_cb.tx_comp_multi(ep->target, queue_to_indicate); 57 /* 58 * all packets are now owned by the callback, 59 * reset queue to be safe 60 */ 61 INIT_LIST_HEAD(queue_to_indicate); 62 } else { 63 /* using legacy EpTxComplete */ 64 do { 65 packet = list_first_entry(queue_to_indicate, 66 struct htc_packet, list); 67 68 list_del(&packet->list); 69 ath6kl_dbg(ATH6KL_DBG_HTC, 70 "%s: calling ep %d send complete callback on packet 0x%p\n", 71 __func__, ep->eid, packet); 72 ep->ep_cb.tx_complete(ep->target, packet); 73 } while (!list_empty(queue_to_indicate)); 74 } 75 } 76 77 static void send_packet_completion(struct htc_target *target, 78 struct htc_packet *packet) 79 { 80 struct htc_endpoint *ep = &target->endpoint[packet->endpoint]; 81 struct list_head container; 82 83 restore_tx_packet(packet); 84 INIT_LIST_HEAD(&container); 85 list_add_tail(&packet->list, &container); 86 87 /* do completion */ 88 do_send_completion(ep, &container); 89 } 90 91 static void get_htc_packet_credit_based(struct htc_target *target, 92 struct htc_endpoint *ep, 93 struct list_head *queue) 94 { 95 int credits_required; 96 int remainder; 97 u8 send_flags; 98 struct htc_packet *packet; 99 unsigned int transfer_len; 100 101 /* NOTE : the TX lock is held when this function is called */ 102 103 /* loop until we can grab as many packets out of the queue as we can */ 104 while (true) { 105 send_flags = 0; 106 if (list_empty(&ep->txq)) 107 break; 108 109 /* get packet at head, but don't remove it */ 110 packet = list_first_entry(&ep->txq, struct htc_packet, list); 111 112 ath6kl_dbg(ATH6KL_DBG_HTC, 113 "%s: got head packet:0x%p , queue depth: %d\n", 114 __func__, packet, get_queue_depth(&ep->txq)); 115 116 transfer_len = packet->act_len + HTC_HDR_LENGTH; 117 118 if (transfer_len <= target->tgt_cred_sz) { 119 credits_required = 1; 120 } else { 121 /* figure out how many credits this message requires */ 122 credits_required = transfer_len / target->tgt_cred_sz; 123 remainder = transfer_len % target->tgt_cred_sz; 124 125 if (remainder) 126 credits_required++; 127 } 128 129 ath6kl_dbg(ATH6KL_DBG_HTC, "%s: creds required:%d got:%d\n", 130 __func__, credits_required, ep->cred_dist.credits); 131 132 if (ep->eid == ENDPOINT_0) { 133 /* 134 * endpoint 0 is special, it always has a credit and 135 * does not require credit based flow control 136 */ 137 credits_required = 0; 138 139 } else { 140 if (ep->cred_dist.credits < credits_required) 141 break; 142 143 ep->cred_dist.credits -= credits_required; 144 ep->ep_st.cred_cosumd += credits_required; 145 146 /* check if we need credits back from the target */ 147 if (ep->cred_dist.credits < 148 ep->cred_dist.cred_per_msg) { 149 /* tell the target we need credits ASAP! */ 150 send_flags |= HTC_FLAGS_NEED_CREDIT_UPDATE; 151 ep->ep_st.cred_low_indicate += 1; 152 ath6kl_dbg(ATH6KL_DBG_HTC, 153 "%s: host needs credits\n", 154 __func__); 155 } 156 } 157 158 /* now we can fully dequeue */ 159 packet = list_first_entry(&ep->txq, struct htc_packet, list); 160 161 list_del(&packet->list); 162 /* save the number of credits this packet consumed */ 163 packet->info.tx.cred_used = credits_required; 164 /* save send flags */ 165 packet->info.tx.flags = send_flags; 166 packet->info.tx.seqno = ep->seqno; 167 ep->seqno++; 168 /* queue this packet into the caller's queue */ 169 list_add_tail(&packet->list, queue); 170 } 171 } 172 173 static void get_htc_packet(struct htc_target *target, 174 struct htc_endpoint *ep, 175 struct list_head *queue, int resources) 176 { 177 struct htc_packet *packet; 178 179 /* NOTE : the TX lock is held when this function is called */ 180 181 /* loop until we can grab as many packets out of the queue as we can */ 182 while (resources) { 183 if (list_empty(&ep->txq)) 184 break; 185 186 packet = list_first_entry(&ep->txq, struct htc_packet, list); 187 list_del(&packet->list); 188 189 ath6kl_dbg(ATH6KL_DBG_HTC, 190 "%s: got packet:0x%p , new queue depth: %d\n", 191 __func__, packet, get_queue_depth(&ep->txq)); 192 packet->info.tx.seqno = ep->seqno; 193 packet->info.tx.flags = 0; 194 packet->info.tx.cred_used = 0; 195 ep->seqno++; 196 197 /* queue this packet into the caller's queue */ 198 list_add_tail(&packet->list, queue); 199 resources--; 200 } 201 } 202 203 static int htc_issue_packets(struct htc_target *target, 204 struct htc_endpoint *ep, 205 struct list_head *pkt_queue) 206 { 207 int status = 0; 208 u16 payload_len; 209 struct sk_buff *skb; 210 struct htc_frame_hdr *htc_hdr; 211 struct htc_packet *packet; 212 213 ath6kl_dbg(ATH6KL_DBG_HTC, 214 "%s: queue: 0x%p, pkts %d\n", __func__, 215 pkt_queue, get_queue_depth(pkt_queue)); 216 217 while (!list_empty(pkt_queue)) { 218 packet = list_first_entry(pkt_queue, struct htc_packet, list); 219 list_del(&packet->list); 220 221 skb = packet->skb; 222 if (!skb) { 223 WARN_ON_ONCE(1); 224 status = -EINVAL; 225 break; 226 } 227 228 payload_len = packet->act_len; 229 230 /* setup HTC frame header */ 231 htc_hdr = (struct htc_frame_hdr *) skb_push(skb, 232 sizeof(*htc_hdr)); 233 if (!htc_hdr) { 234 WARN_ON_ONCE(1); 235 status = -EINVAL; 236 break; 237 } 238 239 packet->info.tx.flags |= HTC_FLAGS_TX_FIXUP_NETBUF; 240 241 /* Endianess? */ 242 put_unaligned((u16) payload_len, &htc_hdr->payld_len); 243 htc_hdr->flags = packet->info.tx.flags; 244 htc_hdr->eid = (u8) packet->endpoint; 245 htc_hdr->ctrl[0] = 0; 246 htc_hdr->ctrl[1] = (u8) packet->info.tx.seqno; 247 248 spin_lock_bh(&target->tx_lock); 249 250 /* store in look up queue to match completions */ 251 list_add_tail(&packet->list, &ep->pipe.tx_lookup_queue); 252 ep->ep_st.tx_issued += 1; 253 spin_unlock_bh(&target->tx_lock); 254 255 status = ath6kl_hif_pipe_send(target->dev->ar, 256 ep->pipe.pipeid_ul, NULL, skb); 257 258 if (status != 0) { 259 if (status != -ENOMEM) { 260 /* TODO: if more than 1 endpoint maps to the 261 * same PipeID, it is possible to run out of 262 * resources in the HIF layer. 263 * Don't emit the error 264 */ 265 ath6kl_dbg(ATH6KL_DBG_HTC, 266 "%s: failed status:%d\n", 267 __func__, status); 268 } 269 spin_lock_bh(&target->tx_lock); 270 list_del(&packet->list); 271 272 /* reclaim credits */ 273 ep->cred_dist.credits += packet->info.tx.cred_used; 274 spin_unlock_bh(&target->tx_lock); 275 276 /* put it back into the callers queue */ 277 list_add(&packet->list, pkt_queue); 278 break; 279 } 280 } 281 282 if (status != 0) { 283 while (!list_empty(pkt_queue)) { 284 if (status != -ENOMEM) { 285 ath6kl_dbg(ATH6KL_DBG_HTC, 286 "%s: failed pkt:0x%p status:%d\n", 287 __func__, packet, status); 288 } 289 290 packet = list_first_entry(pkt_queue, 291 struct htc_packet, list); 292 list_del(&packet->list); 293 packet->status = status; 294 send_packet_completion(target, packet); 295 } 296 } 297 298 return status; 299 } 300 301 static enum htc_send_queue_result htc_try_send(struct htc_target *target, 302 struct htc_endpoint *ep, 303 struct list_head *txq) 304 { 305 struct list_head send_queue; /* temp queue to hold packets */ 306 struct htc_packet *packet, *tmp_pkt; 307 struct ath6kl *ar = target->dev->ar; 308 enum htc_send_full_action action; 309 int tx_resources, overflow, txqueue_depth, i, good_pkts; 310 u8 pipeid; 311 312 ath6kl_dbg(ATH6KL_DBG_HTC, "%s: (queue:0x%p depth:%d)\n", 313 __func__, txq, 314 (txq == NULL) ? 0 : get_queue_depth(txq)); 315 316 /* init the local send queue */ 317 INIT_LIST_HEAD(&send_queue); 318 319 /* 320 * txq equals to NULL means 321 * caller didn't provide a queue, just wants us to 322 * check queues and send 323 */ 324 if (txq != NULL) { 325 if (list_empty(txq)) { 326 /* empty queue */ 327 return HTC_SEND_QUEUE_DROP; 328 } 329 330 spin_lock_bh(&target->tx_lock); 331 txqueue_depth = get_queue_depth(&ep->txq); 332 spin_unlock_bh(&target->tx_lock); 333 334 if (txqueue_depth >= ep->max_txq_depth) { 335 /* we've already overflowed */ 336 overflow = get_queue_depth(txq); 337 } else { 338 /* get how much we will overflow by */ 339 overflow = txqueue_depth; 340 overflow += get_queue_depth(txq); 341 /* get how much we will overflow the TX queue by */ 342 overflow -= ep->max_txq_depth; 343 } 344 345 /* if overflow is negative or zero, we are okay */ 346 if (overflow > 0) { 347 ath6kl_dbg(ATH6KL_DBG_HTC, 348 "%s: Endpoint %d, TX queue will overflow :%d, Tx Depth:%d, Max:%d\n", 349 __func__, ep->eid, overflow, txqueue_depth, 350 ep->max_txq_depth); 351 } 352 if ((overflow <= 0) || 353 (ep->ep_cb.tx_full == NULL)) { 354 /* 355 * all packets will fit or caller did not provide send 356 * full indication handler -- just move all of them 357 * to the local send_queue object 358 */ 359 list_splice_tail_init(txq, &send_queue); 360 } else { 361 good_pkts = get_queue_depth(txq) - overflow; 362 if (good_pkts < 0) { 363 WARN_ON_ONCE(1); 364 return HTC_SEND_QUEUE_DROP; 365 } 366 367 /* we have overflowed, and a callback is provided */ 368 /* dequeue all non-overflow packets to the sendqueue */ 369 for (i = 0; i < good_pkts; i++) { 370 /* pop off caller's queue */ 371 packet = list_first_entry(txq, 372 struct htc_packet, 373 list); 374 /* move to local queue */ 375 list_move_tail(&packet->list, &send_queue); 376 } 377 378 /* 379 * the caller's queue has all the packets that won't fit 380 * walk through the caller's queue and indicate each to 381 * the send full handler 382 */ 383 list_for_each_entry_safe(packet, tmp_pkt, 384 txq, list) { 385 ath6kl_dbg(ATH6KL_DBG_HTC, 386 "%s: Indicat overflowed TX pkts: %p\n", 387 __func__, packet); 388 action = ep->ep_cb.tx_full(ep->target, packet); 389 if (action == HTC_SEND_FULL_DROP) { 390 /* callback wants the packet dropped */ 391 ep->ep_st.tx_dropped += 1; 392 393 /* leave this one in the caller's queue 394 * for cleanup */ 395 } else { 396 /* callback wants to keep this packet, 397 * move from caller's queue to the send 398 * queue */ 399 list_move_tail(&packet->list, 400 &send_queue); 401 } 402 } 403 404 if (list_empty(&send_queue)) { 405 /* no packets made it in, caller will cleanup */ 406 return HTC_SEND_QUEUE_DROP; 407 } 408 } 409 } 410 411 if (!ep->pipe.tx_credit_flow_enabled) { 412 tx_resources = 413 ath6kl_hif_pipe_get_free_queue_number(ar, 414 ep->pipe.pipeid_ul); 415 } else { 416 tx_resources = 0; 417 } 418 419 spin_lock_bh(&target->tx_lock); 420 if (!list_empty(&send_queue)) { 421 /* transfer packets to tail */ 422 list_splice_tail_init(&send_queue, &ep->txq); 423 if (!list_empty(&send_queue)) { 424 WARN_ON_ONCE(1); 425 spin_unlock_bh(&target->tx_lock); 426 return HTC_SEND_QUEUE_DROP; 427 } 428 INIT_LIST_HEAD(&send_queue); 429 } 430 431 /* increment tx processing count on entry */ 432 ep->tx_proc_cnt++; 433 434 if (ep->tx_proc_cnt > 1) { 435 /* 436 * Another thread or task is draining the TX queues on this 437 * endpoint that thread will reset the tx processing count 438 * when the queue is drained. 439 */ 440 ep->tx_proc_cnt--; 441 spin_unlock_bh(&target->tx_lock); 442 return HTC_SEND_QUEUE_OK; 443 } 444 445 /***** beyond this point only 1 thread may enter ******/ 446 447 /* 448 * Now drain the endpoint TX queue for transmission as long as we have 449 * enough transmit resources. 450 */ 451 while (true) { 452 if (get_queue_depth(&ep->txq) == 0) 453 break; 454 455 if (ep->pipe.tx_credit_flow_enabled) { 456 /* 457 * Credit based mechanism provides flow control 458 * based on target transmit resource availability, 459 * we assume that the HIF layer will always have 460 * bus resources greater than target transmit 461 * resources. 462 */ 463 get_htc_packet_credit_based(target, ep, &send_queue); 464 } else { 465 /* 466 * Get all packets for this endpoint that we can 467 * for this pass. 468 */ 469 get_htc_packet(target, ep, &send_queue, tx_resources); 470 } 471 472 if (get_queue_depth(&send_queue) == 0) { 473 /* 474 * Didn't get packets due to out of resources or TX 475 * queue was drained. 476 */ 477 break; 478 } 479 480 spin_unlock_bh(&target->tx_lock); 481 482 /* send what we can */ 483 htc_issue_packets(target, ep, &send_queue); 484 485 if (!ep->pipe.tx_credit_flow_enabled) { 486 pipeid = ep->pipe.pipeid_ul; 487 tx_resources = 488 ath6kl_hif_pipe_get_free_queue_number(ar, pipeid); 489 } 490 491 spin_lock_bh(&target->tx_lock); 492 } 493 494 /* done with this endpoint, we can clear the count */ 495 ep->tx_proc_cnt = 0; 496 spin_unlock_bh(&target->tx_lock); 497 498 return HTC_SEND_QUEUE_OK; 499 } 500 501 /* htc control packet manipulation */ 502 static void destroy_htc_txctrl_packet(struct htc_packet *packet) 503 { 504 struct sk_buff *skb; 505 skb = packet->skb; 506 dev_kfree_skb(skb); 507 kfree(packet); 508 } 509 510 static struct htc_packet *build_htc_txctrl_packet(void) 511 { 512 struct htc_packet *packet = NULL; 513 struct sk_buff *skb; 514 515 packet = kzalloc(sizeof(struct htc_packet), GFP_KERNEL); 516 if (packet == NULL) 517 return NULL; 518 519 skb = __dev_alloc_skb(HTC_CONTROL_BUFFER_SIZE, GFP_KERNEL); 520 521 if (skb == NULL) { 522 kfree(packet); 523 return NULL; 524 } 525 packet->skb = skb; 526 527 return packet; 528 } 529 530 static void htc_free_txctrl_packet(struct htc_target *target, 531 struct htc_packet *packet) 532 { 533 destroy_htc_txctrl_packet(packet); 534 } 535 536 static struct htc_packet *htc_alloc_txctrl_packet(struct htc_target *target) 537 { 538 return build_htc_txctrl_packet(); 539 } 540 541 static void htc_txctrl_complete(struct htc_target *target, 542 struct htc_packet *packet) 543 { 544 htc_free_txctrl_packet(target, packet); 545 } 546 547 #define MAX_MESSAGE_SIZE 1536 548 549 static int htc_setup_target_buffer_assignments(struct htc_target *target) 550 { 551 int status, credits, credit_per_maxmsg, i; 552 struct htc_pipe_txcredit_alloc *entry; 553 unsigned int hif_usbaudioclass = 0; 554 555 credit_per_maxmsg = MAX_MESSAGE_SIZE / target->tgt_cred_sz; 556 if (MAX_MESSAGE_SIZE % target->tgt_cred_sz) 557 credit_per_maxmsg++; 558 559 /* TODO, this should be configured by the caller! */ 560 561 credits = target->tgt_creds; 562 entry = &target->pipe.txcredit_alloc[0]; 563 564 status = -ENOMEM; 565 566 /* FIXME: hif_usbaudioclass is always zero */ 567 if (hif_usbaudioclass) { 568 ath6kl_dbg(ATH6KL_DBG_HTC, 569 "%s: For USB Audio Class- Total:%d\n", 570 __func__, credits); 571 entry++; 572 entry++; 573 /* Setup VO Service To have Max Credits */ 574 entry->service_id = WMI_DATA_VO_SVC; 575 entry->credit_alloc = (credits - 6); 576 if (entry->credit_alloc == 0) 577 entry->credit_alloc++; 578 579 credits -= (int) entry->credit_alloc; 580 if (credits <= 0) 581 return status; 582 583 entry++; 584 entry->service_id = WMI_CONTROL_SVC; 585 entry->credit_alloc = credit_per_maxmsg; 586 credits -= (int) entry->credit_alloc; 587 if (credits <= 0) 588 return status; 589 590 /* leftovers go to best effort */ 591 entry++; 592 entry++; 593 entry->service_id = WMI_DATA_BE_SVC; 594 entry->credit_alloc = (u8) credits; 595 status = 0; 596 } else { 597 entry++; 598 entry->service_id = WMI_DATA_VI_SVC; 599 entry->credit_alloc = credits / 4; 600 if (entry->credit_alloc == 0) 601 entry->credit_alloc++; 602 603 credits -= (int) entry->credit_alloc; 604 if (credits <= 0) 605 return status; 606 607 entry++; 608 entry->service_id = WMI_DATA_VO_SVC; 609 entry->credit_alloc = credits / 4; 610 if (entry->credit_alloc == 0) 611 entry->credit_alloc++; 612 613 credits -= (int) entry->credit_alloc; 614 if (credits <= 0) 615 return status; 616 617 entry++; 618 entry->service_id = WMI_CONTROL_SVC; 619 entry->credit_alloc = credit_per_maxmsg; 620 credits -= (int) entry->credit_alloc; 621 if (credits <= 0) 622 return status; 623 624 entry++; 625 entry->service_id = WMI_DATA_BK_SVC; 626 entry->credit_alloc = credit_per_maxmsg; 627 credits -= (int) entry->credit_alloc; 628 if (credits <= 0) 629 return status; 630 631 /* leftovers go to best effort */ 632 entry++; 633 entry->service_id = WMI_DATA_BE_SVC; 634 entry->credit_alloc = (u8) credits; 635 status = 0; 636 } 637 638 if (status == 0) { 639 for (i = 0; i < ENDPOINT_MAX; i++) { 640 if (target->pipe.txcredit_alloc[i].service_id != 0) { 641 ath6kl_dbg(ATH6KL_DBG_HTC, 642 "HTC Service Index : %d TX : 0x%2.2X : alloc:%d\n", 643 i, 644 target->pipe.txcredit_alloc[i]. 645 service_id, 646 target->pipe.txcredit_alloc[i]. 647 credit_alloc); 648 } 649 } 650 } 651 return status; 652 } 653 654 /* process credit reports and call distribution function */ 655 static void htc_process_credit_report(struct htc_target *target, 656 struct htc_credit_report *rpt, 657 int num_entries, 658 enum htc_endpoint_id from_ep) 659 { 660 int total_credits = 0, i; 661 struct htc_endpoint *ep; 662 663 /* lock out TX while we update credits */ 664 spin_lock_bh(&target->tx_lock); 665 666 for (i = 0; i < num_entries; i++, rpt++) { 667 if (rpt->eid >= ENDPOINT_MAX) { 668 WARN_ON_ONCE(1); 669 spin_unlock_bh(&target->tx_lock); 670 return; 671 } 672 673 ep = &target->endpoint[rpt->eid]; 674 ep->cred_dist.credits += rpt->credits; 675 676 if (ep->cred_dist.credits && get_queue_depth(&ep->txq)) { 677 spin_unlock_bh(&target->tx_lock); 678 htc_try_send(target, ep, NULL); 679 spin_lock_bh(&target->tx_lock); 680 } 681 682 total_credits += rpt->credits; 683 } 684 ath6kl_dbg(ATH6KL_DBG_HTC, 685 "Report indicated %d credits to distribute\n", 686 total_credits); 687 688 spin_unlock_bh(&target->tx_lock); 689 } 690 691 /* flush endpoint TX queue */ 692 static void htc_flush_tx_endpoint(struct htc_target *target, 693 struct htc_endpoint *ep, u16 tag) 694 { 695 struct htc_packet *packet; 696 697 spin_lock_bh(&target->tx_lock); 698 while (get_queue_depth(&ep->txq)) { 699 packet = list_first_entry(&ep->txq, struct htc_packet, list); 700 list_del(&packet->list); 701 packet->status = 0; 702 send_packet_completion(target, packet); 703 } 704 spin_unlock_bh(&target->tx_lock); 705 } 706 707 /* 708 * In the adapted HIF layer, struct sk_buff * are passed between HIF and HTC, 709 * since upper layers expects struct htc_packet containers we use the completed 710 * skb and lookup it's corresponding HTC packet buffer from a lookup list. 711 * This is extra overhead that can be fixed by re-aligning HIF interfaces with 712 * HTC. 713 */ 714 static struct htc_packet *htc_lookup_tx_packet(struct htc_target *target, 715 struct htc_endpoint *ep, 716 struct sk_buff *skb) 717 { 718 struct htc_packet *packet, *tmp_pkt, *found_packet = NULL; 719 720 spin_lock_bh(&target->tx_lock); 721 722 /* 723 * interate from the front of tx lookup queue 724 * this lookup should be fast since lower layers completes in-order and 725 * so the completed packet should be at the head of the list generally 726 */ 727 list_for_each_entry_safe(packet, tmp_pkt, &ep->pipe.tx_lookup_queue, 728 list) { 729 /* check for removal */ 730 if (skb == packet->skb) { 731 /* found it */ 732 list_del(&packet->list); 733 found_packet = packet; 734 break; 735 } 736 } 737 738 spin_unlock_bh(&target->tx_lock); 739 740 return found_packet; 741 } 742 743 static int ath6kl_htc_pipe_tx_complete(struct ath6kl *ar, struct sk_buff *skb) 744 { 745 struct htc_target *target = ar->htc_target; 746 struct htc_frame_hdr *htc_hdr; 747 struct htc_endpoint *ep; 748 struct htc_packet *packet; 749 u8 ep_id, *netdata; 750 u32 netlen; 751 752 netdata = skb->data; 753 netlen = skb->len; 754 755 htc_hdr = (struct htc_frame_hdr *) netdata; 756 757 ep_id = htc_hdr->eid; 758 ep = &target->endpoint[ep_id]; 759 760 packet = htc_lookup_tx_packet(target, ep, skb); 761 if (packet == NULL) { 762 /* may have already been flushed and freed */ 763 ath6kl_err("HTC TX lookup failed!\n"); 764 } else { 765 /* will be giving this buffer back to upper layers */ 766 packet->status = 0; 767 send_packet_completion(target, packet); 768 } 769 skb = NULL; 770 771 if (!ep->pipe.tx_credit_flow_enabled) { 772 /* 773 * note: when using TX credit flow, the re-checking of queues 774 * happens when credits flow back from the target. in the 775 * non-TX credit case, we recheck after the packet completes 776 */ 777 htc_try_send(target, ep, NULL); 778 } 779 780 return 0; 781 } 782 783 static int htc_send_packets_multiple(struct htc_target *target, 784 struct list_head *pkt_queue) 785 { 786 struct htc_endpoint *ep; 787 struct htc_packet *packet, *tmp_pkt; 788 789 if (list_empty(pkt_queue)) 790 return -EINVAL; 791 792 /* get first packet to find out which ep the packets will go into */ 793 packet = list_first_entry(pkt_queue, struct htc_packet, list); 794 795 if (packet->endpoint >= ENDPOINT_MAX) { 796 WARN_ON_ONCE(1); 797 return -EINVAL; 798 } 799 ep = &target->endpoint[packet->endpoint]; 800 801 htc_try_send(target, ep, pkt_queue); 802 803 /* do completion on any packets that couldn't get in */ 804 if (!list_empty(pkt_queue)) { 805 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { 806 packet->status = -ENOMEM; 807 } 808 809 do_send_completion(ep, pkt_queue); 810 } 811 812 return 0; 813 } 814 815 /* htc pipe rx path */ 816 static struct htc_packet *alloc_htc_packet_container(struct htc_target *target) 817 { 818 struct htc_packet *packet; 819 spin_lock_bh(&target->rx_lock); 820 821 if (target->pipe.htc_packet_pool == NULL) { 822 spin_unlock_bh(&target->rx_lock); 823 return NULL; 824 } 825 826 packet = target->pipe.htc_packet_pool; 827 target->pipe.htc_packet_pool = (struct htc_packet *) packet->list.next; 828 829 spin_unlock_bh(&target->rx_lock); 830 831 packet->list.next = NULL; 832 return packet; 833 } 834 835 static void free_htc_packet_container(struct htc_target *target, 836 struct htc_packet *packet) 837 { 838 struct list_head *lh; 839 840 spin_lock_bh(&target->rx_lock); 841 842 if (target->pipe.htc_packet_pool == NULL) { 843 target->pipe.htc_packet_pool = packet; 844 packet->list.next = NULL; 845 } else { 846 lh = (struct list_head *) target->pipe.htc_packet_pool; 847 packet->list.next = lh; 848 target->pipe.htc_packet_pool = packet; 849 } 850 851 spin_unlock_bh(&target->rx_lock); 852 } 853 854 static int htc_process_trailer(struct htc_target *target, u8 *buffer, 855 int len, enum htc_endpoint_id from_ep) 856 { 857 struct htc_credit_report *report; 858 struct htc_record_hdr *record; 859 u8 *record_buf, *orig_buf; 860 int orig_len, status; 861 862 orig_buf = buffer; 863 orig_len = len; 864 status = 0; 865 866 while (len > 0) { 867 if (len < sizeof(struct htc_record_hdr)) { 868 status = -EINVAL; 869 break; 870 } 871 872 /* these are byte aligned structs */ 873 record = (struct htc_record_hdr *) buffer; 874 len -= sizeof(struct htc_record_hdr); 875 buffer += sizeof(struct htc_record_hdr); 876 877 if (record->len > len) { 878 /* no room left in buffer for record */ 879 ath6kl_dbg(ATH6KL_DBG_HTC, 880 "invalid length: %d (id:%d) buffer has: %d bytes left\n", 881 record->len, record->rec_id, len); 882 status = -EINVAL; 883 break; 884 } 885 886 /* start of record follows the header */ 887 record_buf = buffer; 888 889 switch (record->rec_id) { 890 case HTC_RECORD_CREDITS: 891 if (record->len < sizeof(struct htc_credit_report)) { 892 WARN_ON_ONCE(1); 893 return -EINVAL; 894 } 895 896 report = (struct htc_credit_report *) record_buf; 897 htc_process_credit_report(target, report, 898 record->len / sizeof(*report), 899 from_ep); 900 break; 901 default: 902 ath6kl_dbg(ATH6KL_DBG_HTC, 903 "unhandled record: id:%d length:%d\n", 904 record->rec_id, record->len); 905 break; 906 } 907 908 if (status != 0) 909 break; 910 911 /* advance buffer past this record for next time around */ 912 buffer += record->len; 913 len -= record->len; 914 } 915 916 return status; 917 } 918 919 static void do_recv_completion(struct htc_endpoint *ep, 920 struct list_head *queue_to_indicate) 921 { 922 struct htc_packet *packet; 923 924 if (list_empty(queue_to_indicate)) { 925 /* nothing to indicate */ 926 return; 927 } 928 929 /* using legacy EpRecv */ 930 while (!list_empty(queue_to_indicate)) { 931 packet = list_first_entry(queue_to_indicate, 932 struct htc_packet, list); 933 list_del(&packet->list); 934 ep->ep_cb.rx(ep->target, packet); 935 } 936 937 return; 938 } 939 940 static void recv_packet_completion(struct htc_target *target, 941 struct htc_endpoint *ep, 942 struct htc_packet *packet) 943 { 944 struct list_head container; 945 INIT_LIST_HEAD(&container); 946 list_add_tail(&packet->list, &container); 947 948 /* do completion */ 949 do_recv_completion(ep, &container); 950 } 951 952 static int ath6kl_htc_pipe_rx_complete(struct ath6kl *ar, struct sk_buff *skb, 953 u8 pipeid) 954 { 955 struct htc_target *target = ar->htc_target; 956 u8 *netdata, *trailer, hdr_info; 957 struct htc_frame_hdr *htc_hdr; 958 u32 netlen, trailerlen = 0; 959 struct htc_packet *packet; 960 struct htc_endpoint *ep; 961 u16 payload_len; 962 int status = 0; 963 964 /* 965 * ar->htc_target can be NULL due to a race condition that can occur 966 * during driver initialization(we do 'ath6kl_hif_power_on' before 967 * initializing 'ar->htc_target' via 'ath6kl_htc_create'). 968 * 'ath6kl_hif_power_on' assigns 'ath6kl_recv_complete' as 969 * usb_complete_t/callback function for 'usb_fill_bulk_urb'. 970 * Thus the possibility of ar->htc_target being NULL 971 * via ath6kl_recv_complete -> ath6kl_usb_io_comp_work. 972 */ 973 if (WARN_ON_ONCE(!target)) { 974 ath6kl_err("Target not yet initialized\n"); 975 status = -EINVAL; 976 goto free_skb; 977 } 978 979 980 netdata = skb->data; 981 netlen = skb->len; 982 983 htc_hdr = (struct htc_frame_hdr *) netdata; 984 985 if (htc_hdr->eid >= ENDPOINT_MAX) { 986 ath6kl_dbg(ATH6KL_DBG_HTC, 987 "HTC Rx: invalid EndpointID=%d\n", 988 htc_hdr->eid); 989 status = -EINVAL; 990 goto free_skb; 991 } 992 ep = &target->endpoint[htc_hdr->eid]; 993 994 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len)); 995 996 if (netlen < (payload_len + HTC_HDR_LENGTH)) { 997 ath6kl_dbg(ATH6KL_DBG_HTC, 998 "HTC Rx: insufficient length, got:%d expected =%u\n", 999 netlen, payload_len + HTC_HDR_LENGTH); 1000 status = -EINVAL; 1001 goto free_skb; 1002 } 1003 1004 /* get flags to check for trailer */ 1005 hdr_info = htc_hdr->flags; 1006 if (hdr_info & HTC_FLG_RX_TRAILER) { 1007 /* extract the trailer length */ 1008 hdr_info = htc_hdr->ctrl[0]; 1009 if ((hdr_info < sizeof(struct htc_record_hdr)) || 1010 (hdr_info > payload_len)) { 1011 ath6kl_dbg(ATH6KL_DBG_HTC, 1012 "invalid header: payloadlen should be %d, CB[0]: %d\n", 1013 payload_len, hdr_info); 1014 status = -EINVAL; 1015 goto free_skb; 1016 } 1017 1018 trailerlen = hdr_info; 1019 /* process trailer after hdr/apps payload */ 1020 trailer = (u8 *) htc_hdr + HTC_HDR_LENGTH + 1021 payload_len - hdr_info; 1022 status = htc_process_trailer(target, trailer, hdr_info, 1023 htc_hdr->eid); 1024 if (status != 0) 1025 goto free_skb; 1026 } 1027 1028 if (((int) payload_len - (int) trailerlen) <= 0) { 1029 /* zero length packet with trailer, just drop these */ 1030 goto free_skb; 1031 } 1032 1033 if (htc_hdr->eid == ENDPOINT_0) { 1034 /* handle HTC control message */ 1035 if (target->htc_flags & HTC_OP_STATE_SETUP_COMPLETE) { 1036 /* 1037 * fatal: target should not send unsolicited 1038 * messageson the endpoint 0 1039 */ 1040 ath6kl_dbg(ATH6KL_DBG_HTC, 1041 "HTC ignores Rx Ctrl after setup complete\n"); 1042 status = -EINVAL; 1043 goto free_skb; 1044 } 1045 1046 /* remove HTC header */ 1047 skb_pull(skb, HTC_HDR_LENGTH); 1048 1049 netdata = skb->data; 1050 netlen = skb->len; 1051 1052 spin_lock_bh(&target->rx_lock); 1053 1054 target->pipe.ctrl_response_valid = true; 1055 target->pipe.ctrl_response_len = min_t(int, netlen, 1056 HTC_MAX_CTRL_MSG_LEN); 1057 memcpy(target->pipe.ctrl_response_buf, netdata, 1058 target->pipe.ctrl_response_len); 1059 1060 spin_unlock_bh(&target->rx_lock); 1061 1062 dev_kfree_skb(skb); 1063 skb = NULL; 1064 1065 goto free_skb; 1066 } 1067 1068 /* 1069 * TODO: the message based HIF architecture allocates net bufs 1070 * for recv packets since it bridges that HIF to upper layers, 1071 * which expects HTC packets, we form the packets here 1072 */ 1073 packet = alloc_htc_packet_container(target); 1074 if (packet == NULL) { 1075 status = -ENOMEM; 1076 goto free_skb; 1077 } 1078 1079 packet->status = 0; 1080 packet->endpoint = htc_hdr->eid; 1081 packet->pkt_cntxt = skb; 1082 1083 /* TODO: for backwards compatibility */ 1084 packet->buf = skb_push(skb, 0) + HTC_HDR_LENGTH; 1085 packet->act_len = netlen - HTC_HDR_LENGTH - trailerlen; 1086 1087 /* 1088 * TODO: this is a hack because the driver layer will set the 1089 * actual len of the skb again which will just double the len 1090 */ 1091 skb_trim(skb, 0); 1092 1093 recv_packet_completion(target, ep, packet); 1094 1095 /* recover the packet container */ 1096 free_htc_packet_container(target, packet); 1097 skb = NULL; 1098 1099 free_skb: 1100 dev_kfree_skb(skb); 1101 1102 return status; 1103 } 1104 1105 static void htc_flush_rx_queue(struct htc_target *target, 1106 struct htc_endpoint *ep) 1107 { 1108 struct list_head container; 1109 struct htc_packet *packet; 1110 1111 spin_lock_bh(&target->rx_lock); 1112 1113 while (1) { 1114 if (list_empty(&ep->rx_bufq)) 1115 break; 1116 1117 packet = list_first_entry(&ep->rx_bufq, 1118 struct htc_packet, list); 1119 list_del(&packet->list); 1120 1121 spin_unlock_bh(&target->rx_lock); 1122 packet->status = -ECANCELED; 1123 packet->act_len = 0; 1124 1125 ath6kl_dbg(ATH6KL_DBG_HTC, 1126 "Flushing RX packet:0x%p, length:%d, ep:%d\n", 1127 packet, packet->buf_len, 1128 packet->endpoint); 1129 1130 INIT_LIST_HEAD(&container); 1131 list_add_tail(&packet->list, &container); 1132 1133 /* give the packet back */ 1134 do_recv_completion(ep, &container); 1135 spin_lock_bh(&target->rx_lock); 1136 } 1137 1138 spin_unlock_bh(&target->rx_lock); 1139 } 1140 1141 /* polling routine to wait for a control packet to be received */ 1142 static int htc_wait_recv_ctrl_message(struct htc_target *target) 1143 { 1144 int count = HTC_TARGET_RESPONSE_POLL_COUNT; 1145 1146 while (count > 0) { 1147 spin_lock_bh(&target->rx_lock); 1148 1149 if (target->pipe.ctrl_response_valid) { 1150 target->pipe.ctrl_response_valid = false; 1151 spin_unlock_bh(&target->rx_lock); 1152 break; 1153 } 1154 1155 spin_unlock_bh(&target->rx_lock); 1156 1157 count--; 1158 1159 msleep_interruptible(HTC_TARGET_RESPONSE_POLL_WAIT); 1160 } 1161 1162 if (count <= 0) { 1163 ath6kl_warn("htc pipe control receive timeout!\n"); 1164 return -ETIMEDOUT; 1165 } 1166 1167 return 0; 1168 } 1169 1170 static void htc_rxctrl_complete(struct htc_target *context, 1171 struct htc_packet *packet) 1172 { 1173 /* TODO, can't really receive HTC control messages yet.... */ 1174 ath6kl_dbg(ATH6KL_DBG_HTC, "%s: invalid call function\n", __func__); 1175 } 1176 1177 /* htc pipe initialization */ 1178 static void reset_endpoint_states(struct htc_target *target) 1179 { 1180 struct htc_endpoint *ep; 1181 int i; 1182 1183 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 1184 ep = &target->endpoint[i]; 1185 ep->svc_id = 0; 1186 ep->len_max = 0; 1187 ep->max_txq_depth = 0; 1188 ep->eid = i; 1189 INIT_LIST_HEAD(&ep->txq); 1190 INIT_LIST_HEAD(&ep->pipe.tx_lookup_queue); 1191 INIT_LIST_HEAD(&ep->rx_bufq); 1192 ep->target = target; 1193 ep->pipe.tx_credit_flow_enabled = true; 1194 } 1195 } 1196 1197 /* start HTC, this is called after all services are connected */ 1198 static int htc_config_target_hif_pipe(struct htc_target *target) 1199 { 1200 return 0; 1201 } 1202 1203 /* htc service functions */ 1204 static u8 htc_get_credit_alloc(struct htc_target *target, u16 service_id) 1205 { 1206 u8 allocation = 0; 1207 int i; 1208 1209 for (i = 0; i < ENDPOINT_MAX; i++) { 1210 if (target->pipe.txcredit_alloc[i].service_id == service_id) 1211 allocation = 1212 target->pipe.txcredit_alloc[i].credit_alloc; 1213 } 1214 1215 if (allocation == 0) { 1216 ath6kl_dbg(ATH6KL_DBG_HTC, 1217 "HTC Service TX : 0x%2.2X : allocation is zero!\n", 1218 service_id); 1219 } 1220 1221 return allocation; 1222 } 1223 1224 static int ath6kl_htc_pipe_conn_service(struct htc_target *target, 1225 struct htc_service_connect_req *conn_req, 1226 struct htc_service_connect_resp *conn_resp) 1227 { 1228 struct ath6kl *ar = target->dev->ar; 1229 struct htc_packet *packet = NULL; 1230 struct htc_conn_service_resp *resp_msg; 1231 struct htc_conn_service_msg *conn_msg; 1232 enum htc_endpoint_id assigned_epid = ENDPOINT_MAX; 1233 bool disable_credit_flowctrl = false; 1234 unsigned int max_msg_size = 0; 1235 struct htc_endpoint *ep; 1236 int length, status = 0; 1237 struct sk_buff *skb; 1238 u8 tx_alloc; 1239 u16 flags; 1240 1241 if (conn_req->svc_id == 0) { 1242 WARN_ON_ONCE(1); 1243 status = -EINVAL; 1244 goto free_packet; 1245 } 1246 1247 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) { 1248 /* special case for pseudo control service */ 1249 assigned_epid = ENDPOINT_0; 1250 max_msg_size = HTC_MAX_CTRL_MSG_LEN; 1251 tx_alloc = 0; 1252 1253 } else { 1254 tx_alloc = htc_get_credit_alloc(target, conn_req->svc_id); 1255 if (tx_alloc == 0) { 1256 status = -ENOMEM; 1257 goto free_packet; 1258 } 1259 1260 /* allocate a packet to send to the target */ 1261 packet = htc_alloc_txctrl_packet(target); 1262 1263 if (packet == NULL) { 1264 WARN_ON_ONCE(1); 1265 status = -ENOMEM; 1266 goto free_packet; 1267 } 1268 1269 skb = packet->skb; 1270 length = sizeof(struct htc_conn_service_msg); 1271 1272 /* assemble connect service message */ 1273 conn_msg = (struct htc_conn_service_msg *) skb_put(skb, 1274 length); 1275 if (conn_msg == NULL) { 1276 WARN_ON_ONCE(1); 1277 status = -EINVAL; 1278 goto free_packet; 1279 } 1280 1281 memset(conn_msg, 0, 1282 sizeof(struct htc_conn_service_msg)); 1283 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID); 1284 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id); 1285 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags & 1286 ~HTC_CONN_FLGS_SET_RECV_ALLOC_MASK); 1287 1288 /* tell target desired recv alloc for this ep */ 1289 flags = tx_alloc << HTC_CONN_FLGS_SET_RECV_ALLOC_SHIFT; 1290 conn_msg->conn_flags |= cpu_to_le16(flags); 1291 1292 if (conn_req->conn_flags & 1293 HTC_CONN_FLGS_DISABLE_CRED_FLOW_CTRL) { 1294 disable_credit_flowctrl = true; 1295 } 1296 1297 set_htc_pkt_info(packet, NULL, (u8 *) conn_msg, 1298 length, 1299 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1300 1301 status = ath6kl_htc_pipe_tx(target, packet); 1302 1303 /* we don't own it anymore */ 1304 packet = NULL; 1305 if (status != 0) 1306 goto free_packet; 1307 1308 /* wait for response */ 1309 status = htc_wait_recv_ctrl_message(target); 1310 if (status != 0) 1311 goto free_packet; 1312 1313 /* we controlled the buffer creation so it has to be 1314 * properly aligned 1315 */ 1316 resp_msg = (struct htc_conn_service_resp *) 1317 target->pipe.ctrl_response_buf; 1318 1319 if (resp_msg->msg_id != cpu_to_le16(HTC_MSG_CONN_SVC_RESP_ID) || 1320 (target->pipe.ctrl_response_len < sizeof(*resp_msg))) { 1321 /* this message is not valid */ 1322 WARN_ON_ONCE(1); 1323 status = -EINVAL; 1324 goto free_packet; 1325 } 1326 1327 ath6kl_dbg(ATH6KL_DBG_TRC, 1328 "%s: service 0x%X conn resp: status: %d ep: %d\n", 1329 __func__, resp_msg->svc_id, resp_msg->status, 1330 resp_msg->eid); 1331 1332 conn_resp->resp_code = resp_msg->status; 1333 /* check response status */ 1334 if (resp_msg->status != HTC_SERVICE_SUCCESS) { 1335 ath6kl_dbg(ATH6KL_DBG_HTC, 1336 "Target failed service 0x%X connect request (status:%d)\n", 1337 resp_msg->svc_id, resp_msg->status); 1338 status = -EINVAL; 1339 goto free_packet; 1340 } 1341 1342 assigned_epid = (enum htc_endpoint_id) resp_msg->eid; 1343 max_msg_size = le16_to_cpu(resp_msg->max_msg_sz); 1344 } 1345 1346 /* the rest are parameter checks so set the error status */ 1347 status = -EINVAL; 1348 1349 if (assigned_epid >= ENDPOINT_MAX) { 1350 WARN_ON_ONCE(1); 1351 goto free_packet; 1352 } 1353 1354 if (max_msg_size == 0) { 1355 WARN_ON_ONCE(1); 1356 goto free_packet; 1357 } 1358 1359 ep = &target->endpoint[assigned_epid]; 1360 ep->eid = assigned_epid; 1361 if (ep->svc_id != 0) { 1362 /* endpoint already in use! */ 1363 WARN_ON_ONCE(1); 1364 goto free_packet; 1365 } 1366 1367 /* return assigned endpoint to caller */ 1368 conn_resp->endpoint = assigned_epid; 1369 conn_resp->len_max = max_msg_size; 1370 1371 /* setup the endpoint */ 1372 ep->svc_id = conn_req->svc_id; /* this marks ep in use */ 1373 ep->max_txq_depth = conn_req->max_txq_depth; 1374 ep->len_max = max_msg_size; 1375 ep->cred_dist.credits = tx_alloc; 1376 ep->cred_dist.cred_sz = target->tgt_cred_sz; 1377 ep->cred_dist.cred_per_msg = max_msg_size / target->tgt_cred_sz; 1378 if (max_msg_size % target->tgt_cred_sz) 1379 ep->cred_dist.cred_per_msg++; 1380 1381 /* copy all the callbacks */ 1382 ep->ep_cb = conn_req->ep_cb; 1383 1384 /* initialize tx_drop_packet_threshold */ 1385 ep->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM; 1386 1387 status = ath6kl_hif_pipe_map_service(ar, ep->svc_id, 1388 &ep->pipe.pipeid_ul, 1389 &ep->pipe.pipeid_dl); 1390 if (status != 0) 1391 goto free_packet; 1392 1393 ath6kl_dbg(ATH6KL_DBG_HTC, 1394 "SVC Ready: 0x%4.4X: ULpipe:%d DLpipe:%d id:%d\n", 1395 ep->svc_id, ep->pipe.pipeid_ul, 1396 ep->pipe.pipeid_dl, ep->eid); 1397 1398 if (disable_credit_flowctrl && ep->pipe.tx_credit_flow_enabled) { 1399 ep->pipe.tx_credit_flow_enabled = false; 1400 ath6kl_dbg(ATH6KL_DBG_HTC, 1401 "SVC: 0x%4.4X ep:%d TX flow control off\n", 1402 ep->svc_id, assigned_epid); 1403 } 1404 1405 free_packet: 1406 if (packet != NULL) 1407 htc_free_txctrl_packet(target, packet); 1408 return status; 1409 } 1410 1411 /* htc export functions */ 1412 static void *ath6kl_htc_pipe_create(struct ath6kl *ar) 1413 { 1414 int status = 0; 1415 struct htc_endpoint *ep = NULL; 1416 struct htc_target *target = NULL; 1417 struct htc_packet *packet; 1418 int i; 1419 1420 target = kzalloc(sizeof(struct htc_target), GFP_KERNEL); 1421 if (target == NULL) { 1422 ath6kl_err("htc create unable to allocate memory\n"); 1423 status = -ENOMEM; 1424 goto fail_htc_create; 1425 } 1426 1427 spin_lock_init(&target->htc_lock); 1428 spin_lock_init(&target->rx_lock); 1429 spin_lock_init(&target->tx_lock); 1430 1431 reset_endpoint_states(target); 1432 1433 for (i = 0; i < HTC_PACKET_CONTAINER_ALLOCATION; i++) { 1434 packet = kzalloc(sizeof(struct htc_packet), GFP_KERNEL); 1435 1436 if (packet != NULL) 1437 free_htc_packet_container(target, packet); 1438 } 1439 1440 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL); 1441 if (!target->dev) { 1442 ath6kl_err("unable to allocate memory\n"); 1443 status = -ENOMEM; 1444 goto fail_htc_create; 1445 } 1446 target->dev->ar = ar; 1447 target->dev->htc_cnxt = target; 1448 1449 /* Get HIF default pipe for HTC message exchange */ 1450 ep = &target->endpoint[ENDPOINT_0]; 1451 1452 ath6kl_hif_pipe_get_default(ar, &ep->pipe.pipeid_ul, 1453 &ep->pipe.pipeid_dl); 1454 1455 return target; 1456 1457 fail_htc_create: 1458 if (status != 0) { 1459 if (target != NULL) 1460 ath6kl_htc_pipe_cleanup(target); 1461 1462 target = NULL; 1463 } 1464 return target; 1465 } 1466 1467 /* cleanup the HTC instance */ 1468 static void ath6kl_htc_pipe_cleanup(struct htc_target *target) 1469 { 1470 struct htc_packet *packet; 1471 1472 while (true) { 1473 packet = alloc_htc_packet_container(target); 1474 if (packet == NULL) 1475 break; 1476 kfree(packet); 1477 } 1478 1479 kfree(target->dev); 1480 1481 /* kfree our instance */ 1482 kfree(target); 1483 } 1484 1485 static int ath6kl_htc_pipe_start(struct htc_target *target) 1486 { 1487 struct sk_buff *skb; 1488 struct htc_setup_comp_ext_msg *setup; 1489 struct htc_packet *packet; 1490 1491 htc_config_target_hif_pipe(target); 1492 1493 /* allocate a buffer to send */ 1494 packet = htc_alloc_txctrl_packet(target); 1495 if (packet == NULL) { 1496 WARN_ON_ONCE(1); 1497 return -ENOMEM; 1498 } 1499 1500 skb = packet->skb; 1501 1502 /* assemble setup complete message */ 1503 setup = (struct htc_setup_comp_ext_msg *) skb_put(skb, 1504 sizeof(*setup)); 1505 memset(setup, 0, sizeof(struct htc_setup_comp_ext_msg)); 1506 setup->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID); 1507 1508 ath6kl_dbg(ATH6KL_DBG_HTC, "HTC using TX credit flow control\n"); 1509 1510 set_htc_pkt_info(packet, NULL, (u8 *) setup, 1511 sizeof(struct htc_setup_comp_ext_msg), 1512 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1513 1514 target->htc_flags |= HTC_OP_STATE_SETUP_COMPLETE; 1515 1516 return ath6kl_htc_pipe_tx(target, packet); 1517 } 1518 1519 static void ath6kl_htc_pipe_stop(struct htc_target *target) 1520 { 1521 int i; 1522 struct htc_endpoint *ep; 1523 1524 /* cleanup endpoints */ 1525 for (i = 0; i < ENDPOINT_MAX; i++) { 1526 ep = &target->endpoint[i]; 1527 htc_flush_rx_queue(target, ep); 1528 htc_flush_tx_endpoint(target, ep, HTC_TX_PACKET_TAG_ALL); 1529 } 1530 1531 reset_endpoint_states(target); 1532 target->htc_flags &= ~HTC_OP_STATE_SETUP_COMPLETE; 1533 } 1534 1535 static int ath6kl_htc_pipe_get_rxbuf_num(struct htc_target *target, 1536 enum htc_endpoint_id endpoint) 1537 { 1538 int num; 1539 1540 spin_lock_bh(&target->rx_lock); 1541 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq)); 1542 spin_unlock_bh(&target->rx_lock); 1543 1544 return num; 1545 } 1546 1547 static int ath6kl_htc_pipe_tx(struct htc_target *target, 1548 struct htc_packet *packet) 1549 { 1550 struct list_head queue; 1551 1552 ath6kl_dbg(ATH6KL_DBG_HTC, 1553 "%s: endPointId: %d, buffer: 0x%p, length: %d\n", 1554 __func__, packet->endpoint, packet->buf, 1555 packet->act_len); 1556 1557 INIT_LIST_HEAD(&queue); 1558 list_add_tail(&packet->list, &queue); 1559 1560 return htc_send_packets_multiple(target, &queue); 1561 } 1562 1563 static int ath6kl_htc_pipe_wait_target(struct htc_target *target) 1564 { 1565 struct htc_ready_ext_msg *ready_msg; 1566 struct htc_service_connect_req connect; 1567 struct htc_service_connect_resp resp; 1568 int status = 0; 1569 1570 status = htc_wait_recv_ctrl_message(target); 1571 1572 if (status != 0) 1573 return status; 1574 1575 if (target->pipe.ctrl_response_len < sizeof(*ready_msg)) { 1576 ath6kl_warn("invalid htc pipe ready msg len: %d\n", 1577 target->pipe.ctrl_response_len); 1578 return -ECOMM; 1579 } 1580 1581 ready_msg = (struct htc_ready_ext_msg *) target->pipe.ctrl_response_buf; 1582 1583 if (ready_msg->ver2_0_info.msg_id != cpu_to_le16(HTC_MSG_READY_ID)) { 1584 ath6kl_warn("invalid htc pipe ready msg: 0x%x\n", 1585 ready_msg->ver2_0_info.msg_id); 1586 return -ECOMM; 1587 } 1588 1589 ath6kl_dbg(ATH6KL_DBG_HTC, 1590 "Target Ready! : transmit resources : %d size:%d\n", 1591 ready_msg->ver2_0_info.cred_cnt, 1592 ready_msg->ver2_0_info.cred_sz); 1593 1594 target->tgt_creds = le16_to_cpu(ready_msg->ver2_0_info.cred_cnt); 1595 target->tgt_cred_sz = le16_to_cpu(ready_msg->ver2_0_info.cred_sz); 1596 1597 if ((target->tgt_creds == 0) || (target->tgt_cred_sz == 0)) 1598 return -ECOMM; 1599 1600 htc_setup_target_buffer_assignments(target); 1601 1602 /* setup our pseudo HTC control endpoint connection */ 1603 memset(&connect, 0, sizeof(connect)); 1604 memset(&resp, 0, sizeof(resp)); 1605 connect.ep_cb.tx_complete = htc_txctrl_complete; 1606 connect.ep_cb.rx = htc_rxctrl_complete; 1607 connect.max_txq_depth = NUM_CONTROL_TX_BUFFERS; 1608 connect.svc_id = HTC_CTRL_RSVD_SVC; 1609 1610 /* connect fake service */ 1611 status = ath6kl_htc_pipe_conn_service(target, &connect, &resp); 1612 1613 return status; 1614 } 1615 1616 static void ath6kl_htc_pipe_flush_txep(struct htc_target *target, 1617 enum htc_endpoint_id endpoint, u16 tag) 1618 { 1619 struct htc_endpoint *ep = &target->endpoint[endpoint]; 1620 1621 if (ep->svc_id == 0) { 1622 WARN_ON_ONCE(1); 1623 /* not in use.. */ 1624 return; 1625 } 1626 1627 htc_flush_tx_endpoint(target, ep, tag); 1628 } 1629 1630 static int ath6kl_htc_pipe_add_rxbuf_multiple(struct htc_target *target, 1631 struct list_head *pkt_queue) 1632 { 1633 struct htc_packet *packet, *tmp_pkt, *first; 1634 struct htc_endpoint *ep; 1635 int status = 0; 1636 1637 if (list_empty(pkt_queue)) 1638 return -EINVAL; 1639 1640 first = list_first_entry(pkt_queue, struct htc_packet, list); 1641 1642 if (first->endpoint >= ENDPOINT_MAX) { 1643 WARN_ON_ONCE(1); 1644 return -EINVAL; 1645 } 1646 1647 ath6kl_dbg(ATH6KL_DBG_HTC, "%s: epid: %d, cnt:%d, len: %d\n", 1648 __func__, first->endpoint, get_queue_depth(pkt_queue), 1649 first->buf_len); 1650 1651 ep = &target->endpoint[first->endpoint]; 1652 1653 spin_lock_bh(&target->rx_lock); 1654 1655 /* store receive packets */ 1656 list_splice_tail_init(pkt_queue, &ep->rx_bufq); 1657 1658 spin_unlock_bh(&target->rx_lock); 1659 1660 if (status != 0) { 1661 /* walk through queue and mark each one canceled */ 1662 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { 1663 packet->status = -ECANCELED; 1664 } 1665 1666 do_recv_completion(ep, pkt_queue); 1667 } 1668 1669 return status; 1670 } 1671 1672 static void ath6kl_htc_pipe_activity_changed(struct htc_target *target, 1673 enum htc_endpoint_id ep, 1674 bool active) 1675 { 1676 /* TODO */ 1677 } 1678 1679 static void ath6kl_htc_pipe_flush_rx_buf(struct htc_target *target) 1680 { 1681 /* TODO */ 1682 } 1683 1684 static int ath6kl_htc_pipe_credit_setup(struct htc_target *target, 1685 struct ath6kl_htc_credit_info *info) 1686 { 1687 return 0; 1688 } 1689 1690 static const struct ath6kl_htc_ops ath6kl_htc_pipe_ops = { 1691 .create = ath6kl_htc_pipe_create, 1692 .wait_target = ath6kl_htc_pipe_wait_target, 1693 .start = ath6kl_htc_pipe_start, 1694 .conn_service = ath6kl_htc_pipe_conn_service, 1695 .tx = ath6kl_htc_pipe_tx, 1696 .stop = ath6kl_htc_pipe_stop, 1697 .cleanup = ath6kl_htc_pipe_cleanup, 1698 .flush_txep = ath6kl_htc_pipe_flush_txep, 1699 .flush_rx_buf = ath6kl_htc_pipe_flush_rx_buf, 1700 .activity_changed = ath6kl_htc_pipe_activity_changed, 1701 .get_rxbuf_num = ath6kl_htc_pipe_get_rxbuf_num, 1702 .add_rxbuf_multiple = ath6kl_htc_pipe_add_rxbuf_multiple, 1703 .credit_setup = ath6kl_htc_pipe_credit_setup, 1704 .tx_complete = ath6kl_htc_pipe_tx_complete, 1705 .rx_complete = ath6kl_htc_pipe_rx_complete, 1706 }; 1707 1708 void ath6kl_htc_pipe_attach(struct ath6kl *ar) 1709 { 1710 ar->htc_ops = &ath6kl_htc_pipe_ops; 1711 } 1712