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
 107         hdr->eid = ep->eid;
 108         hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
 109         hdr->flags = 0;
 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         if (!skb) {
 195                 ath10k_warn("invalid sk_buff completion - NULL pointer. firmware crashed?\n");
 196                 return 0;
 197         }
 198
 199         ath10k_htc_notify_tx_completion(ep, skb);
 200         /* the skb now belongs to the completion handler */
 201
 202         return 0;
 203 }
 204
 205 /***********/
 206 /* Receive */
 207 /***********/
 208
 209 static void
 210 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 211                                  const struct ath10k_htc_credit_report *report,
 212                                  int len,
 213                                  enum ath10k_htc_ep_id eid)
 214 {
 215         struct ath10k_htc_ep *ep;
 216         int i, n_reports;
 217
 218         if (len % sizeof(*report))
 219                 ath10k_warn("Uneven credit report len %d", len);
 220
 221         n_reports = len / sizeof(*report);
 222
 223         spin_lock_bh(&htc->tx_lock);
 224         for (i = 0; i < n_reports; i++, report++) {
 225                 if (report->eid >= ATH10K_HTC_EP_COUNT)
 226                         break;
 227
 228                 ath10k_dbg(ATH10K_DBG_HTC, "ep %d got %d credits\n",
 229                            report->eid, report->credits);
 230
 231                 ep = &htc->endpoint[report->eid];
 232                 ep->tx_credits += report->credits;
 233
 234                 if (ep->ep_ops.ep_tx_credits) {
 235                         spin_unlock_bh(&htc->tx_lock);
 236                         ep->ep_ops.ep_tx_credits(htc->ar);
 237                         spin_lock_bh(&htc->tx_lock);
 238                 }
 239         }
 240         spin_unlock_bh(&htc->tx_lock);
 241 }
 242
 243 static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
 244                                       u8 *buffer,
 245                                       int length,
 246                                       enum ath10k_htc_ep_id src_eid)
 247 {
 248         int status = 0;
 249         struct ath10k_htc_record *record;
 250         u8 *orig_buffer;
 251         int orig_length;
 252         size_t len;
 253
 254         orig_buffer = buffer;
 255         orig_length = length;
 256
 257         while (length > 0) {
 258                 record = (struct ath10k_htc_record *)buffer;
 259
 260                 if (length < sizeof(record->hdr)) {
 261                         status = -EINVAL;
 262                         break;
 263                 }
 264
 265                 if (record->hdr.len > length) {
 266                         /* no room left in buffer for record */
 267                         ath10k_warn("Invalid record length: %d\n",
 268                                     record->hdr.len);
 269                         status = -EINVAL;
 270                         break;
 271                 }
 272
 273                 switch (record->hdr.id) {
 274                 case ATH10K_HTC_RECORD_CREDITS:
 275                         len = sizeof(struct ath10k_htc_credit_report);
 276                         if (record->hdr.len < len) {
 277                                 ath10k_warn("Credit report too long\n");
 278                                 status = -EINVAL;
 279                                 break;
 280                         }
 281                         ath10k_htc_process_credit_report(htc,
 282                                                          record->credit_report,
 283                                                          record->hdr.len,
 284                                                          src_eid);
 285                         break;
 286                 default:
 287                         ath10k_warn("Unhandled record: id:%d length:%d\n",
 288                                     record->hdr.id, record->hdr.len);
 289                         break;
 290                 }
 291
 292                 if (status)
 293                         break;
 294
 295                 /* multiple records may be present in a trailer */
 296                 buffer += sizeof(record->hdr) + record->hdr.len;
 297                 length -= sizeof(record->hdr) + record->hdr.len;
 298         }
 299
 300         if (status)
 301                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc rx bad trailer", "",
 302                                 orig_buffer, orig_length);
 303
 304         return status;
 305 }
 306
 307 static int ath10k_htc_rx_completion_handler(struct ath10k *ar,
 308                                             struct sk_buff *skb,
 309                                             u8 pipe_id)
 310 {
 311         int status = 0;
 312         struct ath10k_htc *htc = &ar->htc;
 313         struct ath10k_htc_hdr *hdr;
 314         struct ath10k_htc_ep *ep;
 315         u16 payload_len;
 316         u32 trailer_len = 0;
 317         size_t min_len;
 318         u8 eid;
 319         bool trailer_present;
 320
 321         hdr = (struct ath10k_htc_hdr *)skb->data;
 322         skb_pull(skb, sizeof(*hdr));
 323
 324         eid = hdr->eid;
 325
 326         if (eid >= ATH10K_HTC_EP_COUNT) {
 327                 ath10k_warn("HTC Rx: invalid eid %d\n", eid);
 328                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad header", "",
 329                                 hdr, sizeof(*hdr));
 330                 status = -EINVAL;
 331                 goto out;
 332         }
 333
 334         ep = &htc->endpoint[eid];
 335
 336         /*
 337          * If this endpoint that received a message from the target has
 338          * a to-target HIF pipe whose send completions are polled rather
 339          * than interrupt-driven, this is a good point to ask HIF to check
 340          * whether it has any completed sends to handle.
 341          */
 342         if (ep->ul_is_polled)
 343                 ath10k_htc_send_complete_check(ep, 1);
 344
 345         payload_len = __le16_to_cpu(hdr->len);
 346
 347         if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
 348                 ath10k_warn("HTC rx frame too long, len: %zu\n",
 349                             payload_len + sizeof(*hdr));
 350                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len", "",
 351                                 hdr, sizeof(*hdr));
 352                 status = -EINVAL;
 353                 goto out;
 354         }
 355
 356         if (skb->len < payload_len) {
 357                 ath10k_dbg(ATH10K_DBG_HTC,
 358                            "HTC Rx: insufficient length, got %d, expected %d\n",
 359                            skb->len, payload_len);
 360                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len",
 361                                 "", hdr, sizeof(*hdr));
 362                 status = -EINVAL;
 363                 goto out;
 364         }
 365
 366         /* get flags to check for trailer */
 367         trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
 368         if (trailer_present) {
 369                 u8 *trailer;
 370
 371                 trailer_len = hdr->trailer_len;
 372                 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
 373
 374                 if ((trailer_len < min_len) ||
 375                     (trailer_len > payload_len)) {
 376                         ath10k_warn("Invalid trailer length: %d\n",
 377                                     trailer_len);
 378                         status = -EPROTO;
 379                         goto out;
 380                 }
 381
 382                 trailer = (u8 *)hdr;
 383                 trailer += sizeof(*hdr);
 384                 trailer += payload_len;
 385                 trailer -= trailer_len;
 386                 status = ath10k_htc_process_trailer(htc, trailer,
 387                                                     trailer_len, hdr->eid);
 388                 if (status)
 389                         goto out;
 390
 391                 skb_trim(skb, skb->len - trailer_len);
 392         }
 393
 394         if (((int)payload_len - (int)trailer_len) <= 0)
 395                 /* zero length packet with trailer data, just drop these */
 396                 goto out;
 397
 398         if (eid == ATH10K_HTC_EP_0) {
 399                 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
 400
 401                 switch (__le16_to_cpu(msg->hdr.message_id)) {
 402                 default:
 403                         /* handle HTC control message */
 404                         if (completion_done(&htc->ctl_resp)) {
 405                                 /*
 406                                  * this is a fatal error, target should not be
 407                                  * sending unsolicited messages on the ep 0
 408                                  */
 409                                 ath10k_warn("HTC rx ctrl still processing\n");
 410                                 status = -EINVAL;
 411                                 complete(&htc->ctl_resp);
 412                                 goto out;
 413                         }
 414
 415                         htc->control_resp_len =
 416                                 min_t(int, skb->len,
 417                                       ATH10K_HTC_MAX_CTRL_MSG_LEN);
 418
 419                         memcpy(htc->control_resp_buffer, skb->data,
 420                                htc->control_resp_len);
 421
 422                         complete(&htc->ctl_resp);
 423                         break;
 424                 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 425                         htc->htc_ops.target_send_suspend_complete(ar);
 426                 }
 427                 goto out;
 428         }
 429
 430         ath10k_dbg(ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
 431                    eid, skb);
 432         ep->ep_ops.ep_rx_complete(ar, skb);
 433
 434         /* skb is now owned by the rx completion handler */
 435         skb = NULL;
 436 out:
 437         kfree_skb(skb);
 438
 439         return status;
 440 }
 441
 442 static void ath10k_htc_control_rx_complete(struct ath10k *ar,
 443                                            struct sk_buff *skb)
 444 {
 445         /* This is unexpected. FW is not supposed to send regular rx on this
 446          * endpoint. */
 447         ath10k_warn("unexpected htc rx\n");
 448         kfree_skb(skb);
 449 }
 450
 451 /***************/
 452 /* Init/Deinit */
 453 /***************/
 454
 455 static const char *htc_service_name(enum ath10k_htc_svc_id id)
 456 {
 457         switch (id) {
 458         case ATH10K_HTC_SVC_ID_RESERVED:
 459                 return "Reserved";
 460         case ATH10K_HTC_SVC_ID_RSVD_CTRL:
 461                 return "Control";
 462         case ATH10K_HTC_SVC_ID_WMI_CONTROL:
 463                 return "WMI";
 464         case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
 465                 return "DATA BE";
 466         case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
 467                 return "DATA BK";
 468         case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
 469                 return "DATA VI";
 470         case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
 471                 return "DATA VO";
 472         case ATH10K_HTC_SVC_ID_NMI_CONTROL:
 473                 return "NMI Control";
 474         case ATH10K_HTC_SVC_ID_NMI_DATA:
 475                 return "NMI Data";
 476         case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
 477                 return "HTT Data";
 478         case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
 479                 return "RAW";
 480         }
 481
 482         return "Unknown";
 483 }
 484
 485 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
 486 {
 487         struct ath10k_htc_ep *ep;
 488         int i;
 489
 490         for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
 491                 ep = &htc->endpoint[i];
 492                 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
 493                 ep->max_ep_message_len = 0;
 494                 ep->max_tx_queue_depth = 0;
 495                 ep->eid = i;
 496                 ep->htc = htc;
 497                 ep->tx_credit_flow_enabled = true;
 498         }
 499 }
 500
 501 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
 502 {
 503         struct ath10k_htc_svc_tx_credits *entry;
 504
 505         entry = &htc->service_tx_alloc[0];
 506
 507         /*
 508          * for PCIE allocate all credists/HTC buffers to WMI.
 509          * no buffers are used/required for data. data always
 510          * remains on host.
 511          */
 512         entry++;
 513         entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
 514         entry->credit_allocation = htc->total_transmit_credits;
 515 }
 516
 517 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
 518                                            u16 service_id)
 519 {
 520         u8 allocation = 0;
 521         int i;
 522
 523         for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
 524                 if (htc->service_tx_alloc[i].service_id == service_id)
 525                         allocation =
 526                             htc->service_tx_alloc[i].credit_allocation;
 527         }
 528
 529         return allocation;
 530 }
 531
 532 int ath10k_htc_wait_target(struct ath10k_htc *htc)
 533 {
 534         int status = 0;
 535         struct ath10k_htc_svc_conn_req conn_req;
 536         struct ath10k_htc_svc_conn_resp conn_resp;
 537         struct ath10k_htc_msg *msg;
 538         u16 message_id;
 539         u16 credit_count;
 540         u16 credit_size;
 541
 542         status = wait_for_completion_timeout(&htc->ctl_resp,
 543                                              ATH10K_HTC_WAIT_TIMEOUT_HZ);
 544         if (status <= 0) {
 545                 if (status == 0)
 546                         status = -ETIMEDOUT;
 547
 548                 ath10k_err("ctl_resp never came in (%d)\n", status);
 549                 return status;
 550         }
 551
 552         if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 553                 ath10k_err("Invalid HTC ready msg len:%d\n",
 554                            htc->control_resp_len);
 555                 return -ECOMM;
 556         }
 557
 558         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 559         message_id   = __le16_to_cpu(msg->hdr.message_id);
 560         credit_count = __le16_to_cpu(msg->ready.credit_count);
 561         credit_size  = __le16_to_cpu(msg->ready.credit_size);
 562
 563         if (message_id != ATH10K_HTC_MSG_READY_ID) {
 564                 ath10k_err("Invalid HTC ready msg: 0x%x\n", message_id);
 565                 return -ECOMM;
 566         }
 567
 568         htc->total_transmit_credits = credit_count;
 569         htc->target_credit_size = credit_size;
 570
 571         ath10k_dbg(ATH10K_DBG_HTC,
 572                    "Target ready! transmit resources: %d size:%d\n",
 573                    htc->total_transmit_credits,
 574                    htc->target_credit_size);
 575
 576         if ((htc->total_transmit_credits == 0) ||
 577             (htc->target_credit_size == 0)) {
 578                 ath10k_err("Invalid credit size received\n");
 579                 return -ECOMM;
 580         }
 581
 582         ath10k_htc_setup_target_buffer_assignments(htc);
 583
 584         /* setup our pseudo HTC control endpoint connection */
 585         memset(&conn_req, 0, sizeof(conn_req));
 586         memset(&conn_resp, 0, sizeof(conn_resp));
 587         conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
 588         conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
 589         conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
 590         conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
 591
 592         /* connect fake service */
 593         status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
 594         if (status) {
 595                 ath10k_err("could not connect to htc service (%d)\n", status);
 596                 return status;
 597         }
 598
 599         return 0;
 600 }
 601
 602 int ath10k_htc_connect_service(struct ath10k_htc *htc,
 603                                struct ath10k_htc_svc_conn_req *conn_req,
 604                                struct ath10k_htc_svc_conn_resp *conn_resp)
 605 {
 606         struct ath10k_htc_msg *msg;
 607         struct ath10k_htc_conn_svc *req_msg;
 608         struct ath10k_htc_conn_svc_response resp_msg_dummy;
 609         struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
 610         enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
 611         struct ath10k_htc_ep *ep;
 612         struct sk_buff *skb;
 613         unsigned int max_msg_size = 0;
 614         int length, status;
 615         bool disable_credit_flow_ctrl = false;
 616         u16 message_id, service_id, flags = 0;
 617         u8 tx_alloc = 0;
 618
 619         /* special case for HTC pseudo control service */
 620         if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
 621                 disable_credit_flow_ctrl = true;
 622                 assigned_eid = ATH10K_HTC_EP_0;
 623                 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
 624                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 625                 goto setup;
 626         }
 627
 628         tx_alloc = ath10k_htc_get_credit_allocation(htc,
 629                                                     conn_req->service_id);
 630         if (!tx_alloc)
 631                 ath10k_dbg(ATH10K_DBG_BOOT,
 632                            "boot htc service %s does not allocate target credits\n",
 633                            htc_service_name(conn_req->service_id));
 634
 635         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 636         if (!skb) {
 637                 ath10k_err("Failed to allocate HTC packet\n");
 638                 return -ENOMEM;
 639         }
 640
 641         length = sizeof(msg->hdr) + sizeof(msg->connect_service);
 642         skb_put(skb, length);
 643         memset(skb->data, 0, length);
 644
 645         msg = (struct ath10k_htc_msg *)skb->data;
 646         msg->hdr.message_id =
 647                 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
 648
 649         flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
 650
 651         /* Only enable credit flow control for WMI ctrl service */
 652         if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
 653                 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 654                 disable_credit_flow_ctrl = true;
 655         }
 656
 657         req_msg = &msg->connect_service;
 658         req_msg->flags = __cpu_to_le16(flags);
 659         req_msg->service_id = __cpu_to_le16(conn_req->service_id);
 660
 661         reinit_completion(&htc->ctl_resp);
 662
 663         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 664         if (status) {
 665                 kfree_skb(skb);
 666                 return status;
 667         }
 668
 669         /* wait for response */
 670         status = wait_for_completion_timeout(&htc->ctl_resp,
 671                                              ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
 672         if (status <= 0) {
 673                 if (status == 0)
 674                         status = -ETIMEDOUT;
 675                 ath10k_err("Service connect timeout: %d\n", status);
 676                 return status;
 677         }
 678
 679         /* we controlled the buffer creation, it's aligned */
 680         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 681         resp_msg = &msg->connect_service_response;
 682         message_id = __le16_to_cpu(msg->hdr.message_id);
 683         service_id = __le16_to_cpu(resp_msg->service_id);
 684
 685         if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 686             (htc->control_resp_len < sizeof(msg->hdr) +
 687              sizeof(msg->connect_service_response))) {
 688                 ath10k_err("Invalid resp message ID 0x%x", message_id);
 689                 return -EPROTO;
 690         }
 691
 692         ath10k_dbg(ATH10K_DBG_HTC,
 693                    "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
 694                    htc_service_name(service_id),
 695                    resp_msg->status, resp_msg->eid);
 696
 697         conn_resp->connect_resp_code = resp_msg->status;
 698
 699         /* check response status */
 700         if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
 701                 ath10k_err("HTC Service %s connect request failed: 0x%x)\n",
 702                            htc_service_name(service_id),
 703                            resp_msg->status);
 704                 return -EPROTO;
 705         }
 706
 707         assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
 708         max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
 709
 710 setup:
 711
 712         if (assigned_eid >= ATH10K_HTC_EP_COUNT)
 713                 return -EPROTO;
 714
 715         if (max_msg_size == 0)
 716                 return -EPROTO;
 717
 718         ep = &htc->endpoint[assigned_eid];
 719         ep->eid = assigned_eid;
 720
 721         if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
 722                 return -EPROTO;
 723
 724         /* return assigned endpoint to caller */
 725         conn_resp->eid = assigned_eid;
 726         conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
 727
 728         /* setup the endpoint */
 729         ep->service_id = conn_req->service_id;
 730         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 731         ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
 732         ep->tx_credits = tx_alloc;
 733         ep->tx_credit_size = htc->target_credit_size;
 734         ep->tx_credits_per_max_message = ep->max_ep_message_len /
 735                                          htc->target_credit_size;
 736
 737         if (ep->max_ep_message_len % htc->target_credit_size)
 738                 ep->tx_credits_per_max_message++;
 739
 740         /* copy all the callbacks */
 741         ep->ep_ops = conn_req->ep_ops;
 742
 743         status = ath10k_hif_map_service_to_pipe(htc->ar,
 744                                                 ep->service_id,
 745                                                 &ep->ul_pipe_id,
 746                                                 &ep->dl_pipe_id,
 747                                                 &ep->ul_is_polled,
 748                                                 &ep->dl_is_polled);
 749         if (status)
 750                 return status;
 751
 752         ath10k_dbg(ATH10K_DBG_BOOT,
 753                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 754                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 755                    ep->dl_pipe_id, ep->eid);
 756
 757         ath10k_dbg(ATH10K_DBG_BOOT,
 758                    "boot htc ep %d ul polled %d dl polled %d\n",
 759                    ep->eid, ep->ul_is_polled, ep->dl_is_polled);
 760
 761         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 762                 ep->tx_credit_flow_enabled = false;
 763                 ath10k_dbg(ATH10K_DBG_BOOT,
 764                            "boot htc service '%s' eid %d TX flow control disabled\n",
 765                            htc_service_name(ep->service_id), assigned_eid);
 766         }
 767
 768         return status;
 769 }
 770
 771 struct sk_buff *ath10k_htc_alloc_skb(int size)
 772 {
 773         struct sk_buff *skb;
 774
 775         skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
 776         if (!skb) {
 777                 ath10k_warn("could not allocate HTC tx skb\n");
 778                 return NULL;
 779         }
 780
 781         skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
 782
 783         /* FW/HTC requires 4-byte aligned streams */
 784         if (!IS_ALIGNED((unsigned long)skb->data, 4))
 785                 ath10k_warn("Unaligned HTC tx skb\n");
 786
 787         return skb;
 788 }
 789
 790 int ath10k_htc_start(struct ath10k_htc *htc)
 791 {
 792         struct sk_buff *skb;
 793         int status = 0;
 794         struct ath10k_htc_msg *msg;
 795
 796         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 797         if (!skb)
 798                 return -ENOMEM;
 799
 800         skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
 801         memset(skb->data, 0, skb->len);
 802
 803         msg = (struct ath10k_htc_msg *)skb->data;
 804         msg->hdr.message_id =
 805                 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
 806
 807         ath10k_dbg(ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
 808
 809         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 810         if (status) {
 811                 kfree_skb(skb);
 812                 return status;
 813         }
 814
 815         return 0;
 816 }
 817
 818 /*
 819  * stop HTC communications, i.e. stop interrupt reception, and flush all
 820  * queued buffers
 821  */
 822 void ath10k_htc_stop(struct ath10k_htc *htc)
 823 {
 824         spin_lock_bh(&htc->tx_lock);
 825         htc->stopped = true;
 826         spin_unlock_bh(&htc->tx_lock);
 827
 828         ath10k_hif_stop(htc->ar);
 829 }
 830
 831 /* registered target arrival callback from the HIF layer */
 832 int ath10k_htc_init(struct ath10k *ar)
 833 {
 834         struct ath10k_hif_cb htc_callbacks;
 835         struct ath10k_htc_ep *ep = NULL;
 836         struct ath10k_htc *htc = &ar->htc;
 837
 838         spin_lock_init(&htc->tx_lock);
 839
 840         htc->stopped = false;
 841         ath10k_htc_reset_endpoint_states(htc);
 842
 843         /* setup HIF layer callbacks */
 844         htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
 845         htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
 846         htc->ar = ar;
 847
 848         /* Get HIF default pipe for HTC message exchange */
 849         ep = &htc->endpoint[ATH10K_HTC_EP_0];
 850
 851         ath10k_hif_set_callbacks(ar, &htc_callbacks);
 852         ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
 853
 854         init_completion(&htc->ctl_resp);
 855
 856         return 0;
 857 }