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                 return NULL;
  50
  51         skb_reserve(skb, 20); /* FIXME: why 20 bytes? */
  52         WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
  53
  54         skb_cb = ATH10K_SKB_CB(skb);
  55         memset(skb_cb, 0, sizeof(*skb_cb));
  56
  57         ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb);
  58         return skb;
  59 }
  60
  61 static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,
  62                                              struct sk_buff *skb)
  63 {
  64         struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
  65
  66         dma_unmap_single(htc->ar->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
  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         struct ath10k *ar = ep->htc->ar;
  74
  75         ath10k_dbg(ar, 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(ar, "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 static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
  90                                       struct sk_buff *skb)
  91 {
  92         struct ath10k_htc_hdr *hdr;
  93
  94         hdr = (struct ath10k_htc_hdr *)skb->data;
  95
  96         hdr->eid = ep->eid;
  97         hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
  98         hdr->flags = 0;
  99         hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
 100
 101         spin_lock_bh(&ep->htc->tx_lock);
 102         hdr->seq_no = ep->seq_no++;
 103         spin_unlock_bh(&ep->htc->tx_lock);
 104 }
 105
 106 int ath10k_htc_send(struct ath10k_htc *htc,
 107                     enum ath10k_htc_ep_id eid,
 108                     struct sk_buff *skb)
 109 {
 110         struct ath10k *ar = htc->ar;
 111         struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 112         struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
 113         struct ath10k_hif_sg_item sg_item;
 114         struct device *dev = htc->ar->dev;
 115         int credits = 0;
 116         int ret;
 117
 118         if (htc->ar->state == ATH10K_STATE_WEDGED)
 119                 return -ECOMM;
 120
 121         if (eid >= ATH10K_HTC_EP_COUNT) {
 122                 ath10k_warn(ar, "Invalid endpoint id: %d\n", eid);
 123                 return -ENOENT;
 124         }
 125
 126         skb_push(skb, sizeof(struct ath10k_htc_hdr));
 127
 128         if (ep->tx_credit_flow_enabled) {
 129                 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
 130                 spin_lock_bh(&htc->tx_lock);
 131                 if (ep->tx_credits < credits) {
 132                         spin_unlock_bh(&htc->tx_lock);
 133                         ret = -EAGAIN;
 134                         goto err_pull;
 135                 }
 136                 ep->tx_credits -= credits;
 137                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 138                            "htc ep %d consumed %d credits (total %d)\n",
 139                            eid, credits, ep->tx_credits);
 140                 spin_unlock_bh(&htc->tx_lock);
 141         }
 142
 143         ath10k_htc_prepare_tx_skb(ep, skb);
 144
 145         skb_cb->eid = eid;
 146         skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 147         ret = dma_mapping_error(dev, skb_cb->paddr);
 148         if (ret) {
 149                 ret = -EIO;
 150                 goto err_credits;
 151         }
 152
 153         sg_item.transfer_id = ep->eid;
 154         sg_item.transfer_context = skb;
 155         sg_item.vaddr = skb->data;
 156         sg_item.paddr = skb_cb->paddr;
 157         sg_item.len = skb->len;
 158
 159         ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);
 160         if (ret)
 161                 goto err_unmap;
 162
 163         return 0;
 164
 165 err_unmap:
 166         dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
 167 err_credits:
 168         if (ep->tx_credit_flow_enabled) {
 169                 spin_lock_bh(&htc->tx_lock);
 170                 ep->tx_credits += credits;
 171                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 172                            "htc ep %d reverted %d credits back (total %d)\n",
 173                            eid, credits, ep->tx_credits);
 174                 spin_unlock_bh(&htc->tx_lock);
 175
 176                 if (ep->ep_ops.ep_tx_credits)
 177                         ep->ep_ops.ep_tx_credits(htc->ar);
 178         }
 179 err_pull:
 180         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
 181         return ret;
 182 }
 183
 184 static int ath10k_htc_tx_completion_handler(struct ath10k *ar,
 185                                             struct sk_buff *skb)
 186 {
 187         struct ath10k_htc *htc = &ar->htc;
 188         struct ath10k_skb_cb *skb_cb;
 189         struct ath10k_htc_ep *ep;
 190
 191         if (WARN_ON_ONCE(!skb))
 192                 return 0;
 193
 194         skb_cb = ATH10K_SKB_CB(skb);
 195         ep = &htc->endpoint[skb_cb->eid];
 196
 197         ath10k_htc_notify_tx_completion(ep, skb);
 198         /* the skb now belongs to the completion handler */
 199
 200         return 0;
 201 }
 202
 203 /***********/
 204 /* Receive */
 205 /***********/
 206
 207 static void
 208 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 209                                  const struct ath10k_htc_credit_report *report,
 210                                  int len,
 211                                  enum ath10k_htc_ep_id eid)
 212 {
 213         struct ath10k *ar = htc->ar;
 214         struct ath10k_htc_ep *ep;
 215         int i, n_reports;
 216
 217         if (len % sizeof(*report))
 218                 ath10k_warn(ar, "Uneven credit report len %d", len);
 219
 220         n_reports = len / sizeof(*report);
 221
 222         spin_lock_bh(&htc->tx_lock);
 223         for (i = 0; i < n_reports; i++, report++) {
 224                 if (report->eid >= ATH10K_HTC_EP_COUNT)
 225                         break;
 226
 227                 ep = &htc->endpoint[report->eid];
 228                 ep->tx_credits += report->credits;
 229
 230                 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
 231                            report->eid, report->credits, ep->tx_credits);
 232
 233                 if (ep->ep_ops.ep_tx_credits) {
 234                         spin_unlock_bh(&htc->tx_lock);
 235                         ep->ep_ops.ep_tx_credits(htc->ar);
 236                         spin_lock_bh(&htc->tx_lock);
 237                 }
 238         }
 239         spin_unlock_bh(&htc->tx_lock);
 240 }
 241
 242 static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
 243                                       u8 *buffer,
 244                                       int length,
 245                                       enum ath10k_htc_ep_id src_eid)
 246 {
 247         struct ath10k *ar = htc->ar;
 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(ar, "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(ar, "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(ar, "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(ar, 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 {
 310         int status = 0;
 311         struct ath10k_htc *htc = &ar->htc;
 312         struct ath10k_htc_hdr *hdr;
 313         struct ath10k_htc_ep *ep;
 314         u16 payload_len;
 315         u32 trailer_len = 0;
 316         size_t min_len;
 317         u8 eid;
 318         bool trailer_present;
 319
 320         hdr = (struct ath10k_htc_hdr *)skb->data;
 321         skb_pull(skb, sizeof(*hdr));
 322
 323         eid = hdr->eid;
 324
 325         if (eid >= ATH10K_HTC_EP_COUNT) {
 326                 ath10k_warn(ar, "HTC Rx: invalid eid %d\n", eid);
 327                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad header", "",
 328                                 hdr, sizeof(*hdr));
 329                 status = -EINVAL;
 330                 goto out;
 331         }
 332
 333         ep = &htc->endpoint[eid];
 334
 335         /*
 336          * If this endpoint that received a message from the target has
 337          * a to-target HIF pipe whose send completions are polled rather
 338          * than interrupt-driven, this is a good point to ask HIF to check
 339          * whether it has any completed sends to handle.
 340          */
 341         if (ep->ul_is_polled)
 342                 ath10k_htc_send_complete_check(ep, 1);
 343
 344         payload_len = __le16_to_cpu(hdr->len);
 345
 346         if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
 347                 ath10k_warn(ar, "HTC rx frame too long, len: %zu\n",
 348                             payload_len + sizeof(*hdr));
 349                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len", "",
 350                                 hdr, sizeof(*hdr));
 351                 status = -EINVAL;
 352                 goto out;
 353         }
 354
 355         if (skb->len < payload_len) {
 356                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 357                            "HTC Rx: insufficient length, got %d, expected %d\n",
 358                            skb->len, payload_len);
 359                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len",
 360                                 "", hdr, sizeof(*hdr));
 361                 status = -EINVAL;
 362                 goto out;
 363         }
 364
 365         /* get flags to check for trailer */
 366         trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
 367         if (trailer_present) {
 368                 u8 *trailer;
 369
 370                 trailer_len = hdr->trailer_len;
 371                 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
 372
 373                 if ((trailer_len < min_len) ||
 374                     (trailer_len > payload_len)) {
 375                         ath10k_warn(ar, "Invalid trailer length: %d\n",
 376                                     trailer_len);
 377                         status = -EPROTO;
 378                         goto out;
 379                 }
 380
 381                 trailer = (u8 *)hdr;
 382                 trailer += sizeof(*hdr);
 383                 trailer += payload_len;
 384                 trailer -= trailer_len;
 385                 status = ath10k_htc_process_trailer(htc, trailer,
 386                                                     trailer_len, hdr->eid);
 387                 if (status)
 388                         goto out;
 389
 390                 skb_trim(skb, skb->len - trailer_len);
 391         }
 392
 393         if (((int)payload_len - (int)trailer_len) <= 0)
 394                 /* zero length packet with trailer data, just drop these */
 395                 goto out;
 396
 397         if (eid == ATH10K_HTC_EP_0) {
 398                 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
 399
 400                 switch (__le16_to_cpu(msg->hdr.message_id)) {
 401                 case ATH10K_HTC_MSG_READY_ID:
 402                 case ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
 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(ar, "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                         break;
 427                 default:
 428                         ath10k_warn(ar, "ignoring unsolicited htc ep0 event\n");
 429                         break;
 430                 }
 431                 goto out;
 432         }
 433
 434         ath10k_dbg(ar, ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
 435                    eid, skb);
 436         ep->ep_ops.ep_rx_complete(ar, skb);
 437
 438         /* skb is now owned by the rx completion handler */
 439         skb = NULL;
 440 out:
 441         kfree_skb(skb);
 442
 443         return status;
 444 }
 445
 446 static void ath10k_htc_control_rx_complete(struct ath10k *ar,
 447                                            struct sk_buff *skb)
 448 {
 449         /* This is unexpected. FW is not supposed to send regular rx on this
 450          * endpoint. */
 451         ath10k_warn(ar, "unexpected htc rx\n");
 452         kfree_skb(skb);
 453 }
 454
 455 /***************/
 456 /* Init/Deinit */
 457 /***************/
 458
 459 static const char *htc_service_name(enum ath10k_htc_svc_id id)
 460 {
 461         switch (id) {
 462         case ATH10K_HTC_SVC_ID_RESERVED:
 463                 return "Reserved";
 464         case ATH10K_HTC_SVC_ID_RSVD_CTRL:
 465                 return "Control";
 466         case ATH10K_HTC_SVC_ID_WMI_CONTROL:
 467                 return "WMI";
 468         case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
 469                 return "DATA BE";
 470         case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
 471                 return "DATA BK";
 472         case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
 473                 return "DATA VI";
 474         case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
 475                 return "DATA VO";
 476         case ATH10K_HTC_SVC_ID_NMI_CONTROL:
 477                 return "NMI Control";
 478         case ATH10K_HTC_SVC_ID_NMI_DATA:
 479                 return "NMI Data";
 480         case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
 481                 return "HTT Data";
 482         case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
 483                 return "RAW";
 484         }
 485
 486         return "Unknown";
 487 }
 488
 489 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
 490 {
 491         struct ath10k_htc_ep *ep;
 492         int i;
 493
 494         for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
 495                 ep = &htc->endpoint[i];
 496                 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
 497                 ep->max_ep_message_len = 0;
 498                 ep->max_tx_queue_depth = 0;
 499                 ep->eid = i;
 500                 ep->htc = htc;
 501                 ep->tx_credit_flow_enabled = true;
 502         }
 503 }
 504
 505 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
 506 {
 507         struct ath10k_htc_svc_tx_credits *entry;
 508
 509         entry = &htc->service_tx_alloc[0];
 510
 511         /*
 512          * for PCIE allocate all credists/HTC buffers to WMI.
 513          * no buffers are used/required for data. data always
 514          * remains on host.
 515          */
 516         entry++;
 517         entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
 518         entry->credit_allocation = htc->total_transmit_credits;
 519 }
 520
 521 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
 522                                            u16 service_id)
 523 {
 524         u8 allocation = 0;
 525         int i;
 526
 527         for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
 528                 if (htc->service_tx_alloc[i].service_id == service_id)
 529                         allocation =
 530                             htc->service_tx_alloc[i].credit_allocation;
 531         }
 532
 533         return allocation;
 534 }
 535
 536 int ath10k_htc_wait_target(struct ath10k_htc *htc)
 537 {
 538         struct ath10k *ar = htc->ar;
 539         int i, status = 0;
 540         unsigned long time_left;
 541         struct ath10k_htc_svc_conn_req conn_req;
 542         struct ath10k_htc_svc_conn_resp conn_resp;
 543         struct ath10k_htc_msg *msg;
 544         u16 message_id;
 545         u16 credit_count;
 546         u16 credit_size;
 547
 548         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 549                                                 ATH10K_HTC_WAIT_TIMEOUT_HZ);
 550         if (!time_left) {
 551                 /* Workaround: In some cases the PCI HIF doesn't
 552                  * receive interrupt for the control response message
 553                  * even if the buffer was completed. It is suspected
 554                  * iomap writes unmasking PCI CE irqs aren't propagated
 555                  * properly in KVM PCI-passthrough sometimes.
 556                  */
 557                 ath10k_warn(ar, "failed to receive control response completion, polling..\n");
 558
 559                 for (i = 0; i < CE_COUNT; i++)
 560                         ath10k_hif_send_complete_check(htc->ar, i, 1);
 561
 562                 time_left =
 563                 wait_for_completion_timeout(&htc->ctl_resp,
 564                                             ATH10K_HTC_WAIT_TIMEOUT_HZ);
 565
 566                 if (!time_left)
 567                         status = -ETIMEDOUT;
 568         }
 569
 570         if (status < 0) {
 571                 ath10k_err(ar, "ctl_resp never came in (%d)\n", status);
 572                 return status;
 573         }
 574
 575         if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 576                 ath10k_err(ar, "Invalid HTC ready msg len:%d\n",
 577                            htc->control_resp_len);
 578                 return -ECOMM;
 579         }
 580
 581         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 582         message_id   = __le16_to_cpu(msg->hdr.message_id);
 583         credit_count = __le16_to_cpu(msg->ready.credit_count);
 584         credit_size  = __le16_to_cpu(msg->ready.credit_size);
 585
 586         if (message_id != ATH10K_HTC_MSG_READY_ID) {
 587                 ath10k_err(ar, "Invalid HTC ready msg: 0x%x\n", message_id);
 588                 return -ECOMM;
 589         }
 590
 591         htc->total_transmit_credits = credit_count;
 592         htc->target_credit_size = credit_size;
 593
 594         ath10k_dbg(ar, ATH10K_DBG_HTC,
 595                    "Target ready! transmit resources: %d size:%d\n",
 596                    htc->total_transmit_credits,
 597                    htc->target_credit_size);
 598
 599         if ((htc->total_transmit_credits == 0) ||
 600             (htc->target_credit_size == 0)) {
 601                 ath10k_err(ar, "Invalid credit size received\n");
 602                 return -ECOMM;
 603         }
 604
 605         ath10k_htc_setup_target_buffer_assignments(htc);
 606
 607         /* setup our pseudo HTC control endpoint connection */
 608         memset(&conn_req, 0, sizeof(conn_req));
 609         memset(&conn_resp, 0, sizeof(conn_resp));
 610         conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
 611         conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
 612         conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
 613         conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
 614
 615         /* connect fake service */
 616         status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
 617         if (status) {
 618                 ath10k_err(ar, "could not connect to htc service (%d)\n",
 619                            status);
 620                 return status;
 621         }
 622
 623         return 0;
 624 }
 625
 626 int ath10k_htc_connect_service(struct ath10k_htc *htc,
 627                                struct ath10k_htc_svc_conn_req *conn_req,
 628                                struct ath10k_htc_svc_conn_resp *conn_resp)
 629 {
 630         struct ath10k *ar = htc->ar;
 631         struct ath10k_htc_msg *msg;
 632         struct ath10k_htc_conn_svc *req_msg;
 633         struct ath10k_htc_conn_svc_response resp_msg_dummy;
 634         struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
 635         enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
 636         struct ath10k_htc_ep *ep;
 637         struct sk_buff *skb;
 638         unsigned int max_msg_size = 0;
 639         int length, status;
 640         unsigned long time_left;
 641         bool disable_credit_flow_ctrl = false;
 642         u16 message_id, service_id, flags = 0;
 643         u8 tx_alloc = 0;
 644
 645         /* special case for HTC pseudo control service */
 646         if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
 647                 disable_credit_flow_ctrl = true;
 648                 assigned_eid = ATH10K_HTC_EP_0;
 649                 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
 650                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 651                 goto setup;
 652         }
 653
 654         tx_alloc = ath10k_htc_get_credit_allocation(htc,
 655                                                     conn_req->service_id);
 656         if (!tx_alloc)
 657                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 658                            "boot htc service %s does not allocate target credits\n",
 659                            htc_service_name(conn_req->service_id));
 660
 661         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 662         if (!skb) {
 663                 ath10k_err(ar, "Failed to allocate HTC packet\n");
 664                 return -ENOMEM;
 665         }
 666
 667         length = sizeof(msg->hdr) + sizeof(msg->connect_service);
 668         skb_put(skb, length);
 669         memset(skb->data, 0, length);
 670
 671         msg = (struct ath10k_htc_msg *)skb->data;
 672         msg->hdr.message_id =
 673                 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
 674
 675         flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
 676
 677         /* Only enable credit flow control for WMI ctrl service */
 678         if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
 679                 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 680                 disable_credit_flow_ctrl = true;
 681         }
 682
 683         req_msg = &msg->connect_service;
 684         req_msg->flags = __cpu_to_le16(flags);
 685         req_msg->service_id = __cpu_to_le16(conn_req->service_id);
 686
 687         reinit_completion(&htc->ctl_resp);
 688
 689         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 690         if (status) {
 691                 kfree_skb(skb);
 692                 return status;
 693         }
 694
 695         /* wait for response */
 696         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 697                                                 ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
 698         if (!time_left) {
 699                 ath10k_err(ar, "Service connect timeout\n");
 700                 return -ETIMEDOUT;
 701         }
 702
 703         /* we controlled the buffer creation, it's aligned */
 704         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 705         resp_msg = &msg->connect_service_response;
 706         message_id = __le16_to_cpu(msg->hdr.message_id);
 707         service_id = __le16_to_cpu(resp_msg->service_id);
 708
 709         if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 710             (htc->control_resp_len < sizeof(msg->hdr) +
 711              sizeof(msg->connect_service_response))) {
 712                 ath10k_err(ar, "Invalid resp message ID 0x%x", message_id);
 713                 return -EPROTO;
 714         }
 715
 716         ath10k_dbg(ar, ATH10K_DBG_HTC,
 717                    "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
 718                    htc_service_name(service_id),
 719                    resp_msg->status, resp_msg->eid);
 720
 721         conn_resp->connect_resp_code = resp_msg->status;
 722
 723         /* check response status */
 724         if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
 725                 ath10k_err(ar, "HTC Service %s connect request failed: 0x%x)\n",
 726                            htc_service_name(service_id),
 727                            resp_msg->status);
 728                 return -EPROTO;
 729         }
 730
 731         assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
 732         max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
 733
 734 setup:
 735
 736         if (assigned_eid >= ATH10K_HTC_EP_COUNT)
 737                 return -EPROTO;
 738
 739         if (max_msg_size == 0)
 740                 return -EPROTO;
 741
 742         ep = &htc->endpoint[assigned_eid];
 743         ep->eid = assigned_eid;
 744
 745         if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
 746                 return -EPROTO;
 747
 748         /* return assigned endpoint to caller */
 749         conn_resp->eid = assigned_eid;
 750         conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
 751
 752         /* setup the endpoint */
 753         ep->service_id = conn_req->service_id;
 754         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 755         ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
 756         ep->tx_credits = tx_alloc;
 757         ep->tx_credit_size = htc->target_credit_size;
 758         ep->tx_credits_per_max_message = ep->max_ep_message_len /
 759                                          htc->target_credit_size;
 760
 761         if (ep->max_ep_message_len % htc->target_credit_size)
 762                 ep->tx_credits_per_max_message++;
 763
 764         /* copy all the callbacks */
 765         ep->ep_ops = conn_req->ep_ops;
 766
 767         status = ath10k_hif_map_service_to_pipe(htc->ar,
 768                                                 ep->service_id,
 769                                                 &ep->ul_pipe_id,
 770                                                 &ep->dl_pipe_id,
 771                                                 &ep->ul_is_polled,
 772                                                 &ep->dl_is_polled);
 773         if (status)
 774                 return status;
 775
 776         ath10k_dbg(ar, ATH10K_DBG_BOOT,
 777                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 778                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 779                    ep->dl_pipe_id, ep->eid);
 780
 781         ath10k_dbg(ar, ATH10K_DBG_BOOT,
 782                    "boot htc ep %d ul polled %d dl polled %d\n",
 783                    ep->eid, ep->ul_is_polled, ep->dl_is_polled);
 784
 785         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 786                 ep->tx_credit_flow_enabled = false;
 787                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 788                            "boot htc service '%s' eid %d TX flow control disabled\n",
 789                            htc_service_name(ep->service_id), assigned_eid);
 790         }
 791
 792         return status;
 793 }
 794
 795 struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size)
 796 {
 797         struct sk_buff *skb;
 798
 799         skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
 800         if (!skb)
 801                 return NULL;
 802
 803         skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
 804
 805         /* FW/HTC requires 4-byte aligned streams */
 806         if (!IS_ALIGNED((unsigned long)skb->data, 4))
 807                 ath10k_warn(ar, "Unaligned HTC tx skb\n");
 808
 809         return skb;
 810 }
 811
 812 int ath10k_htc_start(struct ath10k_htc *htc)
 813 {
 814         struct ath10k *ar = htc->ar;
 815         struct sk_buff *skb;
 816         int status = 0;
 817         struct ath10k_htc_msg *msg;
 818
 819         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 820         if (!skb)
 821                 return -ENOMEM;
 822
 823         skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
 824         memset(skb->data, 0, skb->len);
 825
 826         msg = (struct ath10k_htc_msg *)skb->data;
 827         msg->hdr.message_id =
 828                 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
 829
 830         ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
 831
 832         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 833         if (status) {
 834                 kfree_skb(skb);
 835                 return status;
 836         }
 837
 838         return 0;
 839 }
 840
 841 /* registered target arrival callback from the HIF layer */
 842 int ath10k_htc_init(struct ath10k *ar)
 843 {
 844         struct ath10k_hif_cb htc_callbacks;
 845         struct ath10k_htc_ep *ep = NULL;
 846         struct ath10k_htc *htc = &ar->htc;
 847
 848         spin_lock_init(&htc->tx_lock);
 849
 850         ath10k_htc_reset_endpoint_states(htc);
 851
 852         /* setup HIF layer callbacks */
 853         htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
 854         htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
 855         htc->ar = ar;
 856
 857         /* Get HIF default pipe for HTC message exchange */
 858         ep = &htc->endpoint[ATH10K_HTC_EP_0];
 859
 860         ath10k_hif_set_callbacks(ar, &htc_callbacks);
 861         ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
 862
 863         init_completion(&htc->ctl_resp);
 864
 865         return 0;
 866 }