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         struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
  67
  68         dma_unmap_single(htc->ar->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
  69         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
  70 }
  71
  72 static void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
  73                                             struct sk_buff *skb)
  74 {
  75         ath10k_dbg(ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
  76                    ep->eid, skb);
  77
  78         ath10k_htc_restore_tx_skb(ep->htc, skb);
  79
  80         if (!ep->ep_ops.ep_tx_complete) {
  81                 ath10k_warn("no tx handler for eid %d\n", ep->eid);
  82                 dev_kfree_skb_any(skb);
  83                 return;
  84         }
  85
  86         ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);
  87 }
  88
  89 /* assumes tx_lock is held */
  90 static bool ath10k_htc_ep_need_credit_update(struct ath10k_htc_ep *ep)
  91 {
  92         if (!ep->tx_credit_flow_enabled)
  93                 return false;
  94         if (ep->tx_credits >= ep->tx_credits_per_max_message)
  95                 return false;
  96
  97         ath10k_dbg(ATH10K_DBG_HTC, "HTC: endpoint %d needs credit update\n",
  98                    ep->eid);
  99         return true;
 100 }
 101
 102 static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
 103                                       struct sk_buff *skb)
 104 {
 105         struct ath10k_htc_hdr *hdr;
 106
 107         hdr = (struct ath10k_htc_hdr *)skb->data;
 108
 109         hdr->eid = ep->eid;
 110         hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
 111         hdr->flags = 0;
 112
 113         spin_lock_bh(&ep->htc->tx_lock);
 114         hdr->seq_no = ep->seq_no++;
 115
 116         if (ath10k_htc_ep_need_credit_update(ep))
 117                 hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
 118
 119         spin_unlock_bh(&ep->htc->tx_lock);
 120 }
 121
 122 int ath10k_htc_send(struct ath10k_htc *htc,
 123                     enum ath10k_htc_ep_id eid,
 124                     struct sk_buff *skb)
 125 {
 126         struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 127         struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
 128         struct ath10k_hif_sg_item sg_item;
 129         struct device *dev = htc->ar->dev;
 130         int credits = 0;
 131         int ret;
 132
 133         if (htc->ar->state == ATH10K_STATE_WEDGED)
 134                 return -ECOMM;
 135
 136         if (eid >= ATH10K_HTC_EP_COUNT) {
 137                 ath10k_warn("Invalid endpoint id: %d\n", eid);
 138                 return -ENOENT;
 139         }
 140
 141         /* FIXME: This looks ugly, can we fix it? */
 142         spin_lock_bh(&htc->tx_lock);
 143         if (htc->stopped) {
 144                 spin_unlock_bh(&htc->tx_lock);
 145                 return -ESHUTDOWN;
 146         }
 147         spin_unlock_bh(&htc->tx_lock);
 148
 149         skb_push(skb, sizeof(struct ath10k_htc_hdr));
 150
 151         if (ep->tx_credit_flow_enabled) {
 152                 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
 153                 spin_lock_bh(&htc->tx_lock);
 154                 if (ep->tx_credits < credits) {
 155                         spin_unlock_bh(&htc->tx_lock);
 156                         ret = -EAGAIN;
 157                         goto err_pull;
 158                 }
 159                 ep->tx_credits -= credits;
 160                 ath10k_dbg(ATH10K_DBG_HTC,
 161                            "htc ep %d consumed %d credits (total %d)\n",
 162                            eid, credits, ep->tx_credits);
 163                 spin_unlock_bh(&htc->tx_lock);
 164         }
 165
 166         ath10k_htc_prepare_tx_skb(ep, skb);
 167
 168         skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 169         ret = dma_mapping_error(dev, skb_cb->paddr);
 170         if (ret)
 171                 goto err_credits;
 172
 173         sg_item.transfer_id = ep->eid;
 174         sg_item.transfer_context = skb;
 175         sg_item.vaddr = skb->data;
 176         sg_item.paddr = skb_cb->paddr;
 177         sg_item.len = skb->len;
 178
 179         ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);
 180         if (ret)
 181                 goto err_unmap;
 182
 183         return 0;
 184
 185 err_unmap:
 186         dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
 187 err_credits:
 188         if (ep->tx_credit_flow_enabled) {
 189                 spin_lock_bh(&htc->tx_lock);
 190                 ep->tx_credits += credits;
 191                 ath10k_dbg(ATH10K_DBG_HTC,
 192                            "htc ep %d reverted %d credits back (total %d)\n",
 193                            eid, credits, ep->tx_credits);
 194                 spin_unlock_bh(&htc->tx_lock);
 195
 196                 if (ep->ep_ops.ep_tx_credits)
 197                         ep->ep_ops.ep_tx_credits(htc->ar);
 198         }
 199 err_pull:
 200         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
 201         return ret;
 202 }
 203
 204 static int ath10k_htc_tx_completion_handler(struct ath10k *ar,
 205                                             struct sk_buff *skb,
 206                                             unsigned int eid)
 207 {
 208         struct ath10k_htc *htc = &ar->htc;
 209         struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 210
 211         if (WARN_ON_ONCE(!skb))
 212                 return 0;
 213
 214         ath10k_htc_notify_tx_completion(ep, skb);
 215         /* the skb now belongs to the completion handler */
 216
 217         return 0;
 218 }
 219
 220 /***********/
 221 /* Receive */
 222 /***********/
 223
 224 static void
 225 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 226                                  const struct ath10k_htc_credit_report *report,
 227                                  int len,
 228                                  enum ath10k_htc_ep_id eid)
 229 {
 230         struct ath10k_htc_ep *ep;
 231         int i, n_reports;
 232
 233         if (len % sizeof(*report))
 234                 ath10k_warn("Uneven credit report len %d", len);
 235
 236         n_reports = len / sizeof(*report);
 237
 238         spin_lock_bh(&htc->tx_lock);
 239         for (i = 0; i < n_reports; i++, report++) {
 240                 if (report->eid >= ATH10K_HTC_EP_COUNT)
 241                         break;
 242
 243                 ep = &htc->endpoint[report->eid];
 244                 ep->tx_credits += report->credits;
 245
 246                 ath10k_dbg(ATH10K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
 247                            report->eid, report->credits, ep->tx_credits);
 248
 249                 if (ep->ep_ops.ep_tx_credits) {
 250                         spin_unlock_bh(&htc->tx_lock);
 251                         ep->ep_ops.ep_tx_credits(htc->ar);
 252                         spin_lock_bh(&htc->tx_lock);
 253                 }
 254         }
 255         spin_unlock_bh(&htc->tx_lock);
 256 }
 257
 258 static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
 259                                       u8 *buffer,
 260                                       int length,
 261                                       enum ath10k_htc_ep_id src_eid)
 262 {
 263         int status = 0;
 264         struct ath10k_htc_record *record;
 265         u8 *orig_buffer;
 266         int orig_length;
 267         size_t len;
 268
 269         orig_buffer = buffer;
 270         orig_length = length;
 271
 272         while (length > 0) {
 273                 record = (struct ath10k_htc_record *)buffer;
 274
 275                 if (length < sizeof(record->hdr)) {
 276                         status = -EINVAL;
 277                         break;
 278                 }
 279
 280                 if (record->hdr.len > length) {
 281                         /* no room left in buffer for record */
 282                         ath10k_warn("Invalid record length: %d\n",
 283                                     record->hdr.len);
 284                         status = -EINVAL;
 285                         break;
 286                 }
 287
 288                 switch (record->hdr.id) {
 289                 case ATH10K_HTC_RECORD_CREDITS:
 290                         len = sizeof(struct ath10k_htc_credit_report);
 291                         if (record->hdr.len < len) {
 292                                 ath10k_warn("Credit report too long\n");
 293                                 status = -EINVAL;
 294                                 break;
 295                         }
 296                         ath10k_htc_process_credit_report(htc,
 297                                                          record->credit_report,
 298                                                          record->hdr.len,
 299                                                          src_eid);
 300                         break;
 301                 default:
 302                         ath10k_warn("Unhandled record: id:%d length:%d\n",
 303                                     record->hdr.id, record->hdr.len);
 304                         break;
 305                 }
 306
 307                 if (status)
 308                         break;
 309
 310                 /* multiple records may be present in a trailer */
 311                 buffer += sizeof(record->hdr) + record->hdr.len;
 312                 length -= sizeof(record->hdr) + record->hdr.len;
 313         }
 314
 315         if (status)
 316                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc rx bad trailer", "",
 317                                 orig_buffer, orig_length);
 318
 319         return status;
 320 }
 321
 322 static int ath10k_htc_rx_completion_handler(struct ath10k *ar,
 323                                             struct sk_buff *skb,
 324                                             u8 pipe_id)
 325 {
 326         int status = 0;
 327         struct ath10k_htc *htc = &ar->htc;
 328         struct ath10k_htc_hdr *hdr;
 329         struct ath10k_htc_ep *ep;
 330         u16 payload_len;
 331         u32 trailer_len = 0;
 332         size_t min_len;
 333         u8 eid;
 334         bool trailer_present;
 335
 336         hdr = (struct ath10k_htc_hdr *)skb->data;
 337         skb_pull(skb, sizeof(*hdr));
 338
 339         eid = hdr->eid;
 340
 341         if (eid >= ATH10K_HTC_EP_COUNT) {
 342                 ath10k_warn("HTC Rx: invalid eid %d\n", eid);
 343                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad header", "",
 344                                 hdr, sizeof(*hdr));
 345                 status = -EINVAL;
 346                 goto out;
 347         }
 348
 349         ep = &htc->endpoint[eid];
 350
 351         /*
 352          * If this endpoint that received a message from the target has
 353          * a to-target HIF pipe whose send completions are polled rather
 354          * than interrupt-driven, this is a good point to ask HIF to check
 355          * whether it has any completed sends to handle.
 356          */
 357         if (ep->ul_is_polled)
 358                 ath10k_htc_send_complete_check(ep, 1);
 359
 360         payload_len = __le16_to_cpu(hdr->len);
 361
 362         if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
 363                 ath10k_warn("HTC rx frame too long, len: %zu\n",
 364                             payload_len + sizeof(*hdr));
 365                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len", "",
 366                                 hdr, sizeof(*hdr));
 367                 status = -EINVAL;
 368                 goto out;
 369         }
 370
 371         if (skb->len < payload_len) {
 372                 ath10k_dbg(ATH10K_DBG_HTC,
 373                            "HTC Rx: insufficient length, got %d, expected %d\n",
 374                            skb->len, payload_len);
 375                 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len",
 376                                 "", hdr, sizeof(*hdr));
 377                 status = -EINVAL;
 378                 goto out;
 379         }
 380
 381         /* get flags to check for trailer */
 382         trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
 383         if (trailer_present) {
 384                 u8 *trailer;
 385
 386                 trailer_len = hdr->trailer_len;
 387                 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
 388
 389                 if ((trailer_len < min_len) ||
 390                     (trailer_len > payload_len)) {
 391                         ath10k_warn("Invalid trailer length: %d\n",
 392                                     trailer_len);
 393                         status = -EPROTO;
 394                         goto out;
 395                 }
 396
 397                 trailer = (u8 *)hdr;
 398                 trailer += sizeof(*hdr);
 399                 trailer += payload_len;
 400                 trailer -= trailer_len;
 401                 status = ath10k_htc_process_trailer(htc, trailer,
 402                                                     trailer_len, hdr->eid);
 403                 if (status)
 404                         goto out;
 405
 406                 skb_trim(skb, skb->len - trailer_len);
 407         }
 408
 409         if (((int)payload_len - (int)trailer_len) <= 0)
 410                 /* zero length packet with trailer data, just drop these */
 411                 goto out;
 412
 413         if (eid == ATH10K_HTC_EP_0) {
 414                 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
 415
 416                 switch (__le16_to_cpu(msg->hdr.message_id)) {
 417                 default:
 418                         /* handle HTC control message */
 419                         if (completion_done(&htc->ctl_resp)) {
 420                                 /*
 421                                  * this is a fatal error, target should not be
 422                                  * sending unsolicited messages on the ep 0
 423                                  */
 424                                 ath10k_warn("HTC rx ctrl still processing\n");
 425                                 status = -EINVAL;
 426                                 complete(&htc->ctl_resp);
 427                                 goto out;
 428                         }
 429
 430                         htc->control_resp_len =
 431                                 min_t(int, skb->len,
 432                                       ATH10K_HTC_MAX_CTRL_MSG_LEN);
 433
 434                         memcpy(htc->control_resp_buffer, skb->data,
 435                                htc->control_resp_len);
 436
 437                         complete(&htc->ctl_resp);
 438                         break;
 439                 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 440                         htc->htc_ops.target_send_suspend_complete(ar);
 441                 }
 442                 goto out;
 443         }
 444
 445         ath10k_dbg(ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
 446                    eid, skb);
 447         ep->ep_ops.ep_rx_complete(ar, skb);
 448
 449         /* skb is now owned by the rx completion handler */
 450         skb = NULL;
 451 out:
 452         kfree_skb(skb);
 453
 454         return status;
 455 }
 456
 457 static void ath10k_htc_control_rx_complete(struct ath10k *ar,
 458                                            struct sk_buff *skb)
 459 {
 460         /* This is unexpected. FW is not supposed to send regular rx on this
 461          * endpoint. */
 462         ath10k_warn("unexpected htc rx\n");
 463         kfree_skb(skb);
 464 }
 465
 466 /***************/
 467 /* Init/Deinit */
 468 /***************/
 469
 470 static const char *htc_service_name(enum ath10k_htc_svc_id id)
 471 {
 472         switch (id) {
 473         case ATH10K_HTC_SVC_ID_RESERVED:
 474                 return "Reserved";
 475         case ATH10K_HTC_SVC_ID_RSVD_CTRL:
 476                 return "Control";
 477         case ATH10K_HTC_SVC_ID_WMI_CONTROL:
 478                 return "WMI";
 479         case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
 480                 return "DATA BE";
 481         case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
 482                 return "DATA BK";
 483         case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
 484                 return "DATA VI";
 485         case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
 486                 return "DATA VO";
 487         case ATH10K_HTC_SVC_ID_NMI_CONTROL:
 488                 return "NMI Control";
 489         case ATH10K_HTC_SVC_ID_NMI_DATA:
 490                 return "NMI Data";
 491         case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
 492                 return "HTT Data";
 493         case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
 494                 return "RAW";
 495         }
 496
 497         return "Unknown";
 498 }
 499
 500 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
 501 {
 502         struct ath10k_htc_ep *ep;
 503         int i;
 504
 505         for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
 506                 ep = &htc->endpoint[i];
 507                 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
 508                 ep->max_ep_message_len = 0;
 509                 ep->max_tx_queue_depth = 0;
 510                 ep->eid = i;
 511                 ep->htc = htc;
 512                 ep->tx_credit_flow_enabled = true;
 513         }
 514 }
 515
 516 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
 517 {
 518         struct ath10k_htc_svc_tx_credits *entry;
 519
 520         entry = &htc->service_tx_alloc[0];
 521
 522         /*
 523          * for PCIE allocate all credists/HTC buffers to WMI.
 524          * no buffers are used/required for data. data always
 525          * remains on host.
 526          */
 527         entry++;
 528         entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
 529         entry->credit_allocation = htc->total_transmit_credits;
 530 }
 531
 532 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
 533                                            u16 service_id)
 534 {
 535         u8 allocation = 0;
 536         int i;
 537
 538         for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
 539                 if (htc->service_tx_alloc[i].service_id == service_id)
 540                         allocation =
 541                             htc->service_tx_alloc[i].credit_allocation;
 542         }
 543
 544         return allocation;
 545 }
 546
 547 int ath10k_htc_wait_target(struct ath10k_htc *htc)
 548 {
 549         int i, status = 0;
 550         struct ath10k_htc_svc_conn_req conn_req;
 551         struct ath10k_htc_svc_conn_resp conn_resp;
 552         struct ath10k_htc_msg *msg;
 553         u16 message_id;
 554         u16 credit_count;
 555         u16 credit_size;
 556
 557         status = wait_for_completion_timeout(&htc->ctl_resp,
 558                                              ATH10K_HTC_WAIT_TIMEOUT_HZ);
 559         if (status == 0) {
 560                 /* Workaround: In some cases the PCI HIF doesn't
 561                  * receive interrupt for the control response message
 562                  * even if the buffer was completed. It is suspected
 563                  * iomap writes unmasking PCI CE irqs aren't propagated
 564                  * properly in KVM PCI-passthrough sometimes.
 565                  */
 566                 ath10k_warn("failed to receive control response completion, polling..\n");
 567
 568                 for (i = 0; i < CE_COUNT; i++)
 569                         ath10k_hif_send_complete_check(htc->ar, i, 1);
 570
 571                 status = wait_for_completion_timeout(&htc->ctl_resp,
 572                                         ATH10K_HTC_WAIT_TIMEOUT_HZ);
 573
 574                 if (status == 0)
 575                         status = -ETIMEDOUT;
 576         }
 577
 578         if (status < 0) {
 579                 ath10k_err("ctl_resp never came in (%d)\n", status);
 580                 return status;
 581         }
 582
 583         if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 584                 ath10k_err("Invalid HTC ready msg len:%d\n",
 585                            htc->control_resp_len);
 586                 return -ECOMM;
 587         }
 588
 589         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 590         message_id   = __le16_to_cpu(msg->hdr.message_id);
 591         credit_count = __le16_to_cpu(msg->ready.credit_count);
 592         credit_size  = __le16_to_cpu(msg->ready.credit_size);
 593
 594         if (message_id != ATH10K_HTC_MSG_READY_ID) {
 595                 ath10k_err("Invalid HTC ready msg: 0x%x\n", message_id);
 596                 return -ECOMM;
 597         }
 598
 599         htc->total_transmit_credits = credit_count;
 600         htc->target_credit_size = credit_size;
 601
 602         ath10k_dbg(ATH10K_DBG_HTC,
 603                    "Target ready! transmit resources: %d size:%d\n",
 604                    htc->total_transmit_credits,
 605                    htc->target_credit_size);
 606
 607         if ((htc->total_transmit_credits == 0) ||
 608             (htc->target_credit_size == 0)) {
 609                 ath10k_err("Invalid credit size received\n");
 610                 return -ECOMM;
 611         }
 612
 613         ath10k_htc_setup_target_buffer_assignments(htc);
 614
 615         /* setup our pseudo HTC control endpoint connection */
 616         memset(&conn_req, 0, sizeof(conn_req));
 617         memset(&conn_resp, 0, sizeof(conn_resp));
 618         conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
 619         conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
 620         conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
 621         conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
 622
 623         /* connect fake service */
 624         status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
 625         if (status) {
 626                 ath10k_err("could not connect to htc service (%d)\n", status);
 627                 return status;
 628         }
 629
 630         return 0;
 631 }
 632
 633 int ath10k_htc_connect_service(struct ath10k_htc *htc,
 634                                struct ath10k_htc_svc_conn_req *conn_req,
 635                                struct ath10k_htc_svc_conn_resp *conn_resp)
 636 {
 637         struct ath10k_htc_msg *msg;
 638         struct ath10k_htc_conn_svc *req_msg;
 639         struct ath10k_htc_conn_svc_response resp_msg_dummy;
 640         struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
 641         enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
 642         struct ath10k_htc_ep *ep;
 643         struct sk_buff *skb;
 644         unsigned int max_msg_size = 0;
 645         int length, status;
 646         bool disable_credit_flow_ctrl = false;
 647         u16 message_id, service_id, flags = 0;
 648         u8 tx_alloc = 0;
 649
 650         /* special case for HTC pseudo control service */
 651         if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
 652                 disable_credit_flow_ctrl = true;
 653                 assigned_eid = ATH10K_HTC_EP_0;
 654                 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
 655                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 656                 goto setup;
 657         }
 658
 659         tx_alloc = ath10k_htc_get_credit_allocation(htc,
 660                                                     conn_req->service_id);
 661         if (!tx_alloc)
 662                 ath10k_dbg(ATH10K_DBG_BOOT,
 663                            "boot htc service %s does not allocate target credits\n",
 664                            htc_service_name(conn_req->service_id));
 665
 666         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 667         if (!skb) {
 668                 ath10k_err("Failed to allocate HTC packet\n");
 669                 return -ENOMEM;
 670         }
 671
 672         length = sizeof(msg->hdr) + sizeof(msg->connect_service);
 673         skb_put(skb, length);
 674         memset(skb->data, 0, length);
 675
 676         msg = (struct ath10k_htc_msg *)skb->data;
 677         msg->hdr.message_id =
 678                 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
 679
 680         flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
 681
 682         /* Only enable credit flow control for WMI ctrl service */
 683         if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
 684                 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 685                 disable_credit_flow_ctrl = true;
 686         }
 687
 688         req_msg = &msg->connect_service;
 689         req_msg->flags = __cpu_to_le16(flags);
 690         req_msg->service_id = __cpu_to_le16(conn_req->service_id);
 691
 692         reinit_completion(&htc->ctl_resp);
 693
 694         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 695         if (status) {
 696                 kfree_skb(skb);
 697                 return status;
 698         }
 699
 700         /* wait for response */
 701         status = wait_for_completion_timeout(&htc->ctl_resp,
 702                                              ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
 703         if (status <= 0) {
 704                 if (status == 0)
 705                         status = -ETIMEDOUT;
 706                 ath10k_err("Service connect timeout: %d\n", status);
 707                 return status;
 708         }
 709
 710         /* we controlled the buffer creation, it's aligned */
 711         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 712         resp_msg = &msg->connect_service_response;
 713         message_id = __le16_to_cpu(msg->hdr.message_id);
 714         service_id = __le16_to_cpu(resp_msg->service_id);
 715
 716         if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 717             (htc->control_resp_len < sizeof(msg->hdr) +
 718              sizeof(msg->connect_service_response))) {
 719                 ath10k_err("Invalid resp message ID 0x%x", message_id);
 720                 return -EPROTO;
 721         }
 722
 723         ath10k_dbg(ATH10K_DBG_HTC,
 724                    "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
 725                    htc_service_name(service_id),
 726                    resp_msg->status, resp_msg->eid);
 727
 728         conn_resp->connect_resp_code = resp_msg->status;
 729
 730         /* check response status */
 731         if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
 732                 ath10k_err("HTC Service %s connect request failed: 0x%x)\n",
 733                            htc_service_name(service_id),
 734                            resp_msg->status);
 735                 return -EPROTO;
 736         }
 737
 738         assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
 739         max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
 740
 741 setup:
 742
 743         if (assigned_eid >= ATH10K_HTC_EP_COUNT)
 744                 return -EPROTO;
 745
 746         if (max_msg_size == 0)
 747                 return -EPROTO;
 748
 749         ep = &htc->endpoint[assigned_eid];
 750         ep->eid = assigned_eid;
 751
 752         if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
 753                 return -EPROTO;
 754
 755         /* return assigned endpoint to caller */
 756         conn_resp->eid = assigned_eid;
 757         conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
 758
 759         /* setup the endpoint */
 760         ep->service_id = conn_req->service_id;
 761         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 762         ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
 763         ep->tx_credits = tx_alloc;
 764         ep->tx_credit_size = htc->target_credit_size;
 765         ep->tx_credits_per_max_message = ep->max_ep_message_len /
 766                                          htc->target_credit_size;
 767
 768         if (ep->max_ep_message_len % htc->target_credit_size)
 769                 ep->tx_credits_per_max_message++;
 770
 771         /* copy all the callbacks */
 772         ep->ep_ops = conn_req->ep_ops;
 773
 774         status = ath10k_hif_map_service_to_pipe(htc->ar,
 775                                                 ep->service_id,
 776                                                 &ep->ul_pipe_id,
 777                                                 &ep->dl_pipe_id,
 778                                                 &ep->ul_is_polled,
 779                                                 &ep->dl_is_polled);
 780         if (status)
 781                 return status;
 782
 783         ath10k_dbg(ATH10K_DBG_BOOT,
 784                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 785                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 786                    ep->dl_pipe_id, ep->eid);
 787
 788         ath10k_dbg(ATH10K_DBG_BOOT,
 789                    "boot htc ep %d ul polled %d dl polled %d\n",
 790                    ep->eid, ep->ul_is_polled, ep->dl_is_polled);
 791
 792         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 793                 ep->tx_credit_flow_enabled = false;
 794                 ath10k_dbg(ATH10K_DBG_BOOT,
 795                            "boot htc service '%s' eid %d TX flow control disabled\n",
 796                            htc_service_name(ep->service_id), assigned_eid);
 797         }
 798
 799         return status;
 800 }
 801
 802 struct sk_buff *ath10k_htc_alloc_skb(int size)
 803 {
 804         struct sk_buff *skb;
 805
 806         skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
 807         if (!skb) {
 808                 ath10k_warn("could not allocate HTC tx skb\n");
 809                 return NULL;
 810         }
 811
 812         skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
 813
 814         /* FW/HTC requires 4-byte aligned streams */
 815         if (!IS_ALIGNED((unsigned long)skb->data, 4))
 816                 ath10k_warn("Unaligned HTC tx skb\n");
 817
 818         return skb;
 819 }
 820
 821 int ath10k_htc_start(struct ath10k_htc *htc)
 822 {
 823         struct sk_buff *skb;
 824         int status = 0;
 825         struct ath10k_htc_msg *msg;
 826
 827         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 828         if (!skb)
 829                 return -ENOMEM;
 830
 831         skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
 832         memset(skb->data, 0, skb->len);
 833
 834         msg = (struct ath10k_htc_msg *)skb->data;
 835         msg->hdr.message_id =
 836                 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
 837
 838         ath10k_dbg(ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
 839
 840         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 841         if (status) {
 842                 kfree_skb(skb);
 843                 return status;
 844         }
 845
 846         return 0;
 847 }
 848
 849 void ath10k_htc_stop(struct ath10k_htc *htc)
 850 {
 851         spin_lock_bh(&htc->tx_lock);
 852         htc->stopped = true;
 853         spin_unlock_bh(&htc->tx_lock);
 854 }
 855
 856 /* registered target arrival callback from the HIF layer */
 857 int ath10k_htc_init(struct ath10k *ar)
 858 {
 859         struct ath10k_hif_cb htc_callbacks;
 860         struct ath10k_htc_ep *ep = NULL;
 861         struct ath10k_htc *htc = &ar->htc;
 862
 863         spin_lock_init(&htc->tx_lock);
 864
 865         htc->stopped = false;
 866         ath10k_htc_reset_endpoint_states(htc);
 867
 868         /* setup HIF layer callbacks */
 869         htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
 870         htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
 871         htc->ar = ar;
 872
 873         /* Get HIF default pipe for HTC message exchange */
 874         ep = &htc->endpoint[ATH10K_HTC_EP_0];
 875
 876         ath10k_hif_set_callbacks(ar, &htc_callbacks);
 877         ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
 878
 879         init_completion(&htc->ctl_resp);
 880
 881         return 0;
 882 }