drivers/net/wireless/ath/ath10k/htc.c

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "core.h"
  19 #include "hif.h"
  20 #include "debug.h"
  21
  22 /********/
  23 /* Send */
  24 /********/
  25
  26 static inline void ath10k_htc_send_complete_check(struct ath10k_htc_ep *ep,
  27                                                   int force)
  28 {
  29         /*
  30          * Check whether HIF has any prior sends that have finished,
  31          * have not had the post-processing done.
  32          */
  33         ath10k_hif_send_complete_check(ep->htc->ar, ep->ul_pipe_id, force);
  34 }
  35
  36 static void ath10k_htc_control_tx_complete(struct ath10k *ar,
  37                                            struct sk_buff *skb)
  38 {
  39         kfree_skb(skb);
  40 }
  41
  42 static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar)
  43 {
  44         struct sk_buff *skb;
  45         struct ath10k_skb_cb *skb_cb;
  46
  47         skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE);
  48         if (!skb) {
  49                 ath10k_warn("Unable to allocate ctrl skb\n");
  50                 return NULL;
  51         }
  52
  53         skb_reserve(skb, 20); /* FIXME: why 20 bytes? */
  54         WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
  55
  56         skb_cb = ATH10K_SKB_CB(skb);
  57         memset(skb_cb, 0, sizeof(*skb_cb));
  58
  59         ath10k_dbg(ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb);
  60         return skb;
  61 }
  62
  63 static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,
  64                                              struct sk_buff *skb)
  65 {
  66         ath10k_skb_unmap(htc->ar->dev, skb);
  67         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
  68 }
  69
  70 static void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
  71                                             struct sk_buff *skb)
  72 {
  73         ath10k_dbg(ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
  74                    ep->eid, skb);
  75
  76         ath10k_htc_restore_tx_skb(ep->htc, skb);
  77
  78         if (!ep->ep_ops.ep_tx_complete) {
  79                 ath10k_warn("no tx handler for eid %d\n", ep->eid);
  80                 dev_kfree_skb_any(skb);
  81                 return;
  82         }
  83
  84         ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);
  85 }
  86
  87 /* assumes tx_lock is held */
  88 static bool ath10k_htc_ep_need_credit_update(struct ath10k_htc_ep *ep)
  89 {
  90         if (!ep->tx_credit_flow_enabled)
  91                 return false;
  92         if (ep->tx_credits >= ep->tx_credits_per_max_message)
  93                 return false;
  94
  95         ath10k_dbg(ATH10K_DBG_HTC, "HTC: endpoint %d needs credit update\n",
  96                    ep->eid);
  97         return true;
  98 }
  99
 100 static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
 101                                       struct sk_buff *skb)
 102 {
 103         struct ath10k_htc_hdr *hdr;
 104
 105         hdr = (struct ath10k_htc_hdr *)skb->data;
 106         memset(hdr, 0, sizeof(*hdr));
 107
 108         hdr->eid = ep->eid;
 109         hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
 110
 111         spin_lock_bh(&ep->htc->tx_lock);
 112         hdr->seq_no = ep->seq_no++;
 113
 114         if (ath10k_htc_ep_need_credit_update(ep))
 115                 hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
 116
 117         spin_unlock_bh(&ep->htc->tx_lock);
 118 }
 119
 120 int ath10k_htc_send(struct ath10k_htc *htc,
 121                     enum ath10k_htc_ep_id eid,
 122                     struct sk_buff *skb)
 123 {
 124         struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 125         int credits = 0;
 126         int ret;
 127
 128         if (htc->ar->state == ATH10K_STATE_WEDGED)
 129                 return -ECOMM;
 130
 131         if (eid >= ATH10K_HTC_EP_COUNT) {
 132                 ath10k_warn("Invalid endpoint id: %d\n", eid);
 133                 return -ENOENT;
 134         }
 135
 136         /* FIXME: This looks ugly, can we fix it? */
 137         spin_lock_bh(&htc->tx_lock);
 138         if (htc->stopped) {
 139                 spin_unlock_bh(&htc->tx_lock);
 140                 return -ESHUTDOWN;
 141         }
 142         spin_unlock_bh(&htc->tx_lock);
 143
 144         skb_push(skb, sizeof(struct ath10k_htc_hdr));
 145
 146         if (ep->tx_credit_flow_enabled) {
 147                 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
 148                 spin_lock_bh(&htc->tx_lock);
 149                 if (ep->tx_credits < credits) {
 150                         spin_unlock_bh(&htc->tx_lock);
 151                         ret = -EAGAIN;
 152                         goto err_pull;
 153                 }
 154                 ep->tx_credits -= credits;
 155                 spin_unlock_bh(&htc->tx_lock);
 156         }
 157
 158         ath10k_htc_prepare_tx_skb(ep, skb);
 159
 160         ret = ath10k_skb_map(htc->ar->dev, skb);
 161         if (ret)
 162                 goto err_credits;
 163
 164         ret = ath10k_hif_send_head(htc->ar, ep->ul_pipe_id, ep->eid,
 165                                    skb->len, skb);
 166         if (ret)
 167                 goto err_unmap;
 168
 169         return 0;
 170
 171 err_unmap:
 172         ath10k_skb_unmap(htc->ar->dev, skb);
 173 err_credits:
 174         if (ep->tx_credit_flow_enabled) {
 175                 spin_lock_bh(&htc->tx_lock);
 176                 ep->tx_credits += credits;
 177                 spin_unlock_bh(&htc->tx_lock);
 178
 179                 if (ep->ep_ops.ep_tx_credits)
 180                         ep->ep_ops.ep_tx_credits(htc->ar);
 181         }
 182 err_pull:
 183         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
 184         return ret;
 185 }
 186
 187 static int ath10k_htc_tx_completion_handler(struct ath10k *ar,
 188                                             struct sk_buff *skb,
 189                                             unsigned int eid)
 190 {
 191         struct ath10k_htc *htc = &ar->htc;
 192         struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 193
 194         ath10k_htc_notify_tx_completion(ep, skb);
 195         /* the skb now belongs to the completion handler */
 196
 197         return 0;
 198 }
 199
 200 /***********/
 201 /* Receive */
 202 /***********/
 203
 204 static void
 205 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 206                                  const struct ath10k_htc_credit_report *report,
 207                                  int len,
 208                                  enum ath10k_htc_ep_id eid)
 209 {
 210         struct ath10k_htc_ep *ep;
 211         int i, n_reports;
 212
 213         if (len % sizeof(*report))
 214                 ath10k_warn("Uneven credit report len %d", len);
 215
 216         n_reports = len / sizeof(*report);
 217
 218         spin_lock_bh(&htc->tx_lock);
 219         for (i = 0; i < n_reports; i++, report++) {
 220                 if (report->eid >= ATH10K_HTC_EP_COUNT)
 221                         break;
 222
 223                 ath10k_dbg(ATH10K_DBG_HTC, "ep %d got %d credits\n",
 224                            report->eid, report->credits);
 225
 226                 ep = &htc->endpoint[report->eid];
 227                 ep->tx_credits += report->credits;
 228
 229                 if (ep->ep_ops.ep_tx_credits) {
 230                         spin_unlock_bh(&htc->tx_lock);
 231                         ep->ep_ops.ep_tx_credits(htc->ar);
 232                         spin_lock_bh(&htc->tx_lock);
 233                 }
 234         }
 235         spin_unlock_bh(&htc->tx_lock);
 236 }
 237
 238 static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
 239                                       u8 *buffer,
 240                                       int length,
 241                                       enum ath10k_htc_ep_id src_eid)
 242 {
 243         int status = 0;
 244         struct ath10k_htc_record *record;
 245         u8 *orig_buffer;
 246         int orig_length;
 247         size_t len;
 248
 249         orig_buffer = buffer;
 250         orig_length = length;
 251
 252         while (length > 0) {
 253                 record = (struct ath10k_htc_record *)buffer;
 254
 255                 if (length < sizeof(record->hdr)) {
 256                         status = -EINVAL;
 257                         break;
 258                 }
 259
 260                 if (record->hdr.len > length) {
 261                         /* no room left in buffer for record */
 262                         ath10k_warn("Invalid record length: %d\n",
 263                                     record->hdr.len);
 264                         status = -EINVAL;
 265                         break;
 266                 }
 267
 268                 switch (record->hdr.id) {
 269                 case ATH10K_HTC_RECORD_CREDITS:
 270                         len = sizeof(struct ath10k_htc_credit_report);
 271                         if (record->hdr.len < len) {
 272                                 ath10k_warn("Credit report too long\n");
 273                                 status = -EINVAL;
 274                                 break;
 275                         }
 276                         ath10k_htc_process_credit_report(htc,
 277                                                          record->credit_report,
 278                                                          record->hdr.len,
 279                                                          src_eid);
 280                         break;
 281                 default:
 282                         ath10k_warn("Unhandled record: id:%d length:%d\n",
 283                                     record->hdr.id, record->hdr.len);
 284                         break;
 285                 }
 286
 287                 if (status)
 288                         break;
 289
 290                 /* multiple records may be present in a trailer */
 291                 buffer += sizeof(record->hdr) + record->hdr.len;
 292                 length -= sizeof(record->hdr) + record->hdr.len;
 293         }
 294
 295         if (status)
 296                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc rx bad trailer", "",
 297                                 orig_buffer, orig_length);
 298
 299         return status;
 300 }
 301
 302 static int ath10k_htc_rx_completion_handler(struct ath10k *ar,
 303                                             struct sk_buff *skb,
 304                                             u8 pipe_id)
 305 {
 306         int status = 0;
 307         struct ath10k_htc *htc = &ar->htc;
 308         struct ath10k_htc_hdr *hdr;
 309         struct ath10k_htc_ep *ep;
 310         u16 payload_len;
 311         u32 trailer_len = 0;
 312         size_t min_len;
 313         u8 eid;
 314         bool trailer_present;
 315
 316         hdr = (struct ath10k_htc_hdr *)skb->data;
 317         skb_pull(skb, sizeof(*hdr));
 318
 319         eid = hdr->eid;
 320
 321         if (eid >= ATH10K_HTC_EP_COUNT) {
 322                 ath10k_warn("HTC Rx: invalid eid %d\n", eid);
 323                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad header", "",
 324                                 hdr, sizeof(*hdr));
 325                 status = -EINVAL;
 326                 goto out;
 327         }
 328
 329         ep = &htc->endpoint[eid];
 330
 331         /*
 332          * If this endpoint that received a message from the target has
 333          * a to-target HIF pipe whose send completions are polled rather
 334          * than interrupt-driven, this is a good point to ask HIF to check
 335          * whether it has any completed sends to handle.
 336          */
 337         if (ep->ul_is_polled)
 338                 ath10k_htc_send_complete_check(ep, 1);
 339
 340         payload_len = __le16_to_cpu(hdr->len);
 341
 342         if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
 343                 ath10k_warn("HTC rx frame too long, len: %zu\n",
 344                             payload_len + sizeof(*hdr));
 345                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len", "",
 346                                 hdr, sizeof(*hdr));
 347                 status = -EINVAL;
 348                 goto out;
 349         }
 350
 351         if (skb->len < payload_len) {
 352                 ath10k_dbg(ATH10K_DBG_HTC,
 353                            "HTC Rx: insufficient length, got %d, expected %d\n",
 354                            skb->len, payload_len);
 355                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len",
 356                                 "", hdr, sizeof(*hdr));
 357                 status = -EINVAL;
 358                 goto out;
 359         }
 360
 361         /* get flags to check for trailer */
 362         trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
 363         if (trailer_present) {
 364                 u8 *trailer;
 365
 366                 trailer_len = hdr->trailer_len;
 367                 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
 368
 369                 if ((trailer_len < min_len) ||
 370                     (trailer_len > payload_len)) {
 371                         ath10k_warn("Invalid trailer length: %d\n",
 372                                     trailer_len);
 373                         status = -EPROTO;
 374                         goto out;
 375                 }
 376
 377                 trailer = (u8 *)hdr;
 378                 trailer += sizeof(*hdr);
 379                 trailer += payload_len;
 380                 trailer -= trailer_len;
 381                 status = ath10k_htc_process_trailer(htc, trailer,
 382                                                     trailer_len, hdr->eid);
 383                 if (status)
 384                         goto out;
 385
 386                 skb_trim(skb, skb->len - trailer_len);
 387         }
 388
 389         if (((int)payload_len - (int)trailer_len) <= 0)
 390                 /* zero length packet with trailer data, just drop these */
 391                 goto out;
 392
 393         if (eid == ATH10K_HTC_EP_0) {
 394                 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
 395
 396                 switch (__le16_to_cpu(msg->hdr.message_id)) {
 397                 default:
 398                         /* handle HTC control message */
 399                         if (completion_done(&htc->ctl_resp)) {
 400                                 /*
 401                                  * this is a fatal error, target should not be
 402                                  * sending unsolicited messages on the ep 0
 403                                  */
 404                                 ath10k_warn("HTC rx ctrl still processing\n");
 405                                 status = -EINVAL;
 406                                 complete(&htc->ctl_resp);
 407                                 goto out;
 408                         }
 409
 410                         htc->control_resp_len =
 411                                 min_t(int, skb->len,
 412                                       ATH10K_HTC_MAX_CTRL_MSG_LEN);
 413
 414                         memcpy(htc->control_resp_buffer, skb->data,
 415                                htc->control_resp_len);
 416
 417                         complete(&htc->ctl_resp);
 418                         break;
 419                 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 420                         htc->htc_ops.target_send_suspend_complete(ar);
 421                 }
 422                 goto out;
 423         }
 424
 425         ath10k_dbg(ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
 426                    eid, skb);
 427         ep->ep_ops.ep_rx_complete(ar, skb);
 428
 429         /* skb is now owned by the rx completion handler */
 430         skb = NULL;
 431 out:
 432         kfree_skb(skb);
 433
 434         return status;
 435 }
 436
 437 static void ath10k_htc_control_rx_complete(struct ath10k *ar,
 438                                            struct sk_buff *skb)
 439 {
 440         /* This is unexpected. FW is not supposed to send regular rx on this
 441          * endpoint. */
 442         ath10k_warn("unexpected htc rx\n");
 443         kfree_skb(skb);
 444 }
 445
 446 /***************/
 447 /* Init/Deinit */
 448 /***************/
 449
 450 static const char *htc_service_name(enum ath10k_htc_svc_id id)
 451 {
 452         switch (id) {
 453         case ATH10K_HTC_SVC_ID_RESERVED:
 454                 return "Reserved";
 455         case ATH10K_HTC_SVC_ID_RSVD_CTRL:
 456                 return "Control";
 457         case ATH10K_HTC_SVC_ID_WMI_CONTROL:
 458                 return "WMI";
 459         case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
 460                 return "DATA BE";
 461         case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
 462                 return "DATA BK";
 463         case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
 464                 return "DATA VI";
 465         case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
 466                 return "DATA VO";
 467         case ATH10K_HTC_SVC_ID_NMI_CONTROL:
 468                 return "NMI Control";
 469         case ATH10K_HTC_SVC_ID_NMI_DATA:
 470                 return "NMI Data";
 471         case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
 472                 return "HTT Data";
 473         case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
 474                 return "RAW";
 475         }
 476
 477         return "Unknown";
 478 }
 479
 480 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
 481 {
 482         struct ath10k_htc_ep *ep;
 483         int i;
 484
 485         for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
 486                 ep = &htc->endpoint[i];
 487                 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
 488                 ep->max_ep_message_len = 0;
 489                 ep->max_tx_queue_depth = 0;
 490                 ep->eid = i;
 491                 ep->htc = htc;
 492                 ep->tx_credit_flow_enabled = true;
 493         }
 494 }
 495
 496 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
 497 {
 498         struct ath10k_htc_svc_tx_credits *entry;
 499
 500         entry = &htc->service_tx_alloc[0];
 501
 502         /*
 503          * for PCIE allocate all credists/HTC buffers to WMI.
 504          * no buffers are used/required for data. data always
 505          * remains on host.
 506          */
 507         entry++;
 508         entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
 509         entry->credit_allocation = htc->total_transmit_credits;
 510 }
 511
 512 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
 513                                            u16 service_id)
 514 {
 515         u8 allocation = 0;
 516         int i;
 517
 518         for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
 519                 if (htc->service_tx_alloc[i].service_id == service_id)
 520                         allocation =
 521                             htc->service_tx_alloc[i].credit_allocation;
 522         }
 523
 524         return allocation;
 525 }
 526
 527 int ath10k_htc_wait_target(struct ath10k_htc *htc)
 528 {
 529         int status = 0;
 530         struct ath10k_htc_svc_conn_req conn_req;
 531         struct ath10k_htc_svc_conn_resp conn_resp;
 532         struct ath10k_htc_msg *msg;
 533         u16 message_id;
 534         u16 credit_count;
 535         u16 credit_size;
 536
 537         INIT_COMPLETION(htc->ctl_resp);
 538
 539         status = ath10k_hif_start(htc->ar);
 540         if (status) {
 541                 ath10k_err("could not start HIF (%d)\n", status);
 542                 goto err_start;
 543         }
 544
 545         status = wait_for_completion_timeout(&htc->ctl_resp,
 546                                              ATH10K_HTC_WAIT_TIMEOUT_HZ);
 547         if (status <= 0) {
 548                 if (status == 0)
 549                         status = -ETIMEDOUT;
 550
 551                 ath10k_err("ctl_resp never came in (%d)\n", status);
 552                 goto err_target;
 553         }
 554
 555         if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 556                 ath10k_err("Invalid HTC ready msg len:%d\n",
 557                            htc->control_resp_len);
 558
 559                 status = -ECOMM;
 560                 goto err_target;
 561         }
 562
 563         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 564         message_id   = __le16_to_cpu(msg->hdr.message_id);
 565         credit_count = __le16_to_cpu(msg->ready.credit_count);
 566         credit_size  = __le16_to_cpu(msg->ready.credit_size);
 567
 568         if (message_id != ATH10K_HTC_MSG_READY_ID) {
 569                 ath10k_err("Invalid HTC ready msg: 0x%x\n", message_id);
 570                 status = -ECOMM;
 571                 goto err_target;
 572         }
 573
 574         htc->total_transmit_credits = credit_count;
 575         htc->target_credit_size = credit_size;
 576
 577         ath10k_dbg(ATH10K_DBG_HTC,
 578                    "Target ready! transmit resources: %d size:%d\n",
 579                    htc->total_transmit_credits,
 580                    htc->target_credit_size);
 581
 582         if ((htc->total_transmit_credits == 0) ||
 583             (htc->target_credit_size == 0)) {
 584                 status = -ECOMM;
 585                 ath10k_err("Invalid credit size received\n");
 586                 goto err_target;
 587         }
 588
 589         ath10k_htc_setup_target_buffer_assignments(htc);
 590
 591         /* setup our pseudo HTC control endpoint connection */
 592         memset(&conn_req, 0, sizeof(conn_req));
 593         memset(&conn_resp, 0, sizeof(conn_resp));
 594         conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
 595         conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
 596         conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
 597         conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
 598
 599         /* connect fake service */
 600         status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
 601         if (status) {
 602                 ath10k_err("could not connect to htc service (%d)\n", status);
 603                 goto err_target;
 604         }
 605
 606         return 0;
 607 err_target:
 608         ath10k_hif_stop(htc->ar);
 609 err_start:
 610         return status;
 611 }
 612
 613 int ath10k_htc_connect_service(struct ath10k_htc *htc,
 614                                struct ath10k_htc_svc_conn_req *conn_req,
 615                                struct ath10k_htc_svc_conn_resp *conn_resp)
 616 {
 617         struct ath10k_htc_msg *msg;
 618         struct ath10k_htc_conn_svc *req_msg;
 619         struct ath10k_htc_conn_svc_response resp_msg_dummy;
 620         struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
 621         enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
 622         struct ath10k_htc_ep *ep;
 623         struct sk_buff *skb;
 624         unsigned int max_msg_size = 0;
 625         int length, status;
 626         bool disable_credit_flow_ctrl = false;
 627         u16 message_id, service_id, flags = 0;
 628         u8 tx_alloc = 0;
 629
 630         /* special case for HTC pseudo control service */
 631         if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
 632                 disable_credit_flow_ctrl = true;
 633                 assigned_eid = ATH10K_HTC_EP_0;
 634                 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
 635                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 636                 goto setup;
 637         }
 638
 639         tx_alloc = ath10k_htc_get_credit_allocation(htc,
 640                                                     conn_req->service_id);
 641         if (!tx_alloc)
 642                 ath10k_dbg(ATH10K_DBG_BOOT,
 643                            "boot htc service %s does not allocate target credits\n",
 644                            htc_service_name(conn_req->service_id));
 645
 646         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 647         if (!skb) {
 648                 ath10k_err("Failed to allocate HTC packet\n");
 649                 return -ENOMEM;
 650         }
 651
 652         length = sizeof(msg->hdr) + sizeof(msg->connect_service);
 653         skb_put(skb, length);
 654         memset(skb->data, 0, length);
 655
 656         msg = (struct ath10k_htc_msg *)skb->data;
 657         msg->hdr.message_id =
 658                 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
 659
 660         flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
 661
 662         /* Only enable credit flow control for WMI ctrl service */
 663         if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
 664                 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 665                 disable_credit_flow_ctrl = true;
 666         }
 667
 668         req_msg = &msg->connect_service;
 669         req_msg->flags = __cpu_to_le16(flags);
 670         req_msg->service_id = __cpu_to_le16(conn_req->service_id);
 671
 672         INIT_COMPLETION(htc->ctl_resp);
 673
 674         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 675         if (status) {
 676                 kfree_skb(skb);
 677                 return status;
 678         }
 679
 680         /* wait for response */
 681         status = wait_for_completion_timeout(&htc->ctl_resp,
 682                                              ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
 683         if (status <= 0) {
 684                 if (status == 0)
 685                         status = -ETIMEDOUT;
 686                 ath10k_err("Service connect timeout: %d\n", status);
 687                 return status;
 688         }
 689
 690         /* we controlled the buffer creation, it's aligned */
 691         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 692         resp_msg = &msg->connect_service_response;
 693         message_id = __le16_to_cpu(msg->hdr.message_id);
 694         service_id = __le16_to_cpu(resp_msg->service_id);
 695
 696         if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 697             (htc->control_resp_len < sizeof(msg->hdr) +
 698              sizeof(msg->connect_service_response))) {
 699                 ath10k_err("Invalid resp message ID 0x%x", message_id);
 700                 return -EPROTO;
 701         }
 702
 703         ath10k_dbg(ATH10K_DBG_HTC,
 704                    "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
 705                    htc_service_name(service_id),
 706                    resp_msg->status, resp_msg->eid);
 707
 708         conn_resp->connect_resp_code = resp_msg->status;
 709
 710         /* check response status */
 711         if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
 712                 ath10k_err("HTC Service %s connect request failed: 0x%x)\n",
 713                            htc_service_name(service_id),
 714                            resp_msg->status);
 715                 return -EPROTO;
 716         }
 717
 718         assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
 719         max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
 720
 721 setup:
 722
 723         if (assigned_eid >= ATH10K_HTC_EP_COUNT)
 724                 return -EPROTO;
 725
 726         if (max_msg_size == 0)
 727                 return -EPROTO;
 728
 729         ep = &htc->endpoint[assigned_eid];
 730         ep->eid = assigned_eid;
 731
 732         if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
 733                 return -EPROTO;
 734
 735         /* return assigned endpoint to caller */
 736         conn_resp->eid = assigned_eid;
 737         conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
 738
 739         /* setup the endpoint */
 740         ep->service_id = conn_req->service_id;
 741         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 742         ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
 743         ep->tx_credits = tx_alloc;
 744         ep->tx_credit_size = htc->target_credit_size;
 745         ep->tx_credits_per_max_message = ep->max_ep_message_len /
 746                                          htc->target_credit_size;
 747
 748         if (ep->max_ep_message_len % htc->target_credit_size)
 749                 ep->tx_credits_per_max_message++;
 750
 751         /* copy all the callbacks */
 752         ep->ep_ops = conn_req->ep_ops;
 753
 754         status = ath10k_hif_map_service_to_pipe(htc->ar,
 755                                                 ep->service_id,
 756                                                 &ep->ul_pipe_id,
 757                                                 &ep->dl_pipe_id,
 758                                                 &ep->ul_is_polled,
 759                                                 &ep->dl_is_polled);
 760         if (status)
 761                 return status;
 762
 763         ath10k_dbg(ATH10K_DBG_BOOT,
 764                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 765                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 766                    ep->dl_pipe_id, ep->eid);
 767
 768         ath10k_dbg(ATH10K_DBG_BOOT,
 769                    "boot htc ep %d ul polled %d dl polled %d\n",
 770                    ep->eid, ep->ul_is_polled, ep->dl_is_polled);
 771
 772         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 773                 ep->tx_credit_flow_enabled = false;
 774                 ath10k_dbg(ATH10K_DBG_BOOT,
 775                            "boot htc service '%s' eid %d TX flow control disabled\n",
 776                            htc_service_name(ep->service_id), assigned_eid);
 777         }
 778
 779         return status;
 780 }
 781
 782 struct sk_buff *ath10k_htc_alloc_skb(int size)
 783 {
 784         struct sk_buff *skb;
 785
 786         skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
 787         if (!skb) {
 788                 ath10k_warn("could not allocate HTC tx skb\n");
 789                 return NULL;
 790         }
 791
 792         skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
 793
 794         /* FW/HTC requires 4-byte aligned streams */
 795         if (!IS_ALIGNED((unsigned long)skb->data, 4))
 796                 ath10k_warn("Unaligned HTC tx skb\n");
 797
 798         return skb;
 799 }
 800
 801 int ath10k_htc_start(struct ath10k_htc *htc)
 802 {
 803         struct sk_buff *skb;
 804         int status = 0;
 805         struct ath10k_htc_msg *msg;
 806
 807         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 808         if (!skb)
 809                 return -ENOMEM;
 810
 811         skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
 812         memset(skb->data, 0, skb->len);
 813
 814         msg = (struct ath10k_htc_msg *)skb->data;
 815         msg->hdr.message_id =
 816                 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
 817
 818         ath10k_dbg(ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
 819
 820         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 821         if (status) {
 822                 kfree_skb(skb);
 823                 return status;
 824         }
 825
 826         return 0;
 827 }
 828
 829 /*
 830  * stop HTC communications, i.e. stop interrupt reception, and flush all
 831  * queued buffers
 832  */
 833 void ath10k_htc_stop(struct ath10k_htc *htc)
 834 {
 835         spin_lock_bh(&htc->tx_lock);
 836         htc->stopped = true;
 837         spin_unlock_bh(&htc->tx_lock);
 838
 839         ath10k_hif_stop(htc->ar);
 840 }
 841
 842 /* registered target arrival callback from the HIF layer */
 843 int ath10k_htc_init(struct ath10k *ar)
 844 {
 845         struct ath10k_hif_cb htc_callbacks;
 846         struct ath10k_htc_ep *ep = NULL;
 847         struct ath10k_htc *htc = &ar->htc;
 848
 849         spin_lock_init(&htc->tx_lock);
 850
 851         htc->stopped = false;
 852         ath10k_htc_reset_endpoint_states(htc);
 853
 854         /* setup HIF layer callbacks */
 855         htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
 856         htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
 857         htc->ar = ar;
 858
 859         /* Get HIF default pipe for HTC message exchange */
 860         ep = &htc->endpoint[ATH10K_HTC_EP_0];
 861
 862         ath10k_hif_set_callbacks(ar, &htc_callbacks);
 863         ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
 864
 865         init_completion(&htc->ctl_resp);
 866
 867         return 0;
 868 }