drivers/net/wireless/ath/ath6kl/htc_pipe.c

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