kernel/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 /* assumes tx_lock is held */
  90 static bool ath10k_htc_ep_need_credit_update(struct ath10k_htc_ep *ep)
  91 {
  92         struct ath10k *ar = ep->htc->ar;
  93
  94         if (!ep->tx_credit_flow_enabled)
  95                 return false;
  96         if (ep->tx_credits >= ep->tx_credits_per_max_message)
  97                 return false;
  98
  99         ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC: endpoint %d needs credit update\n",
 100                    ep->eid);
 101         return true;
 102 }
 103
 104 static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
 105                                       struct sk_buff *skb)
 106 {
 107         struct ath10k_htc_hdr *hdr;
 108
 109         hdr = (struct ath10k_htc_hdr *)skb->data;
 110
 111         hdr->eid = ep->eid;
 112         hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
 113         hdr->flags = 0;
 114
 115         spin_lock_bh(&ep->htc->tx_lock);
 116         hdr->seq_no = ep->seq_no++;
 117
 118         if (ath10k_htc_ep_need_credit_update(ep))
 119                 hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
 120
 121         spin_unlock_bh(&ep->htc->tx_lock);
 122 }
 123
 124 int ath10k_htc_send(struct ath10k_htc *htc,
 125                     enum ath10k_htc_ep_id eid,
 126                     struct sk_buff *skb)
 127 {
 128         struct ath10k *ar = htc->ar;
 129         struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 130         struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
 131         struct ath10k_hif_sg_item sg_item;
 132         struct device *dev = htc->ar->dev;
 133         int credits = 0;
 134         int ret;
 135
 136         if (htc->ar->state == ATH10K_STATE_WEDGED)
 137                 return -ECOMM;
 138
 139         if (eid >= ATH10K_HTC_EP_COUNT) {
 140                 ath10k_warn(ar, "Invalid endpoint id: %d\n", eid);
 141                 return -ENOENT;
 142         }
 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                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 156                            "htc ep %d consumed %d credits (total %d)\n",
 157                            eid, credits, ep->tx_credits);
 158                 spin_unlock_bh(&htc->tx_lock);
 159         }
 160
 161         ath10k_htc_prepare_tx_skb(ep, skb);
 162
 163         skb_cb->eid = eid;
 164         skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 165         ret = dma_mapping_error(dev, skb_cb->paddr);
 166         if (ret)
 167                 goto err_credits;
 168
 169         sg_item.transfer_id = ep->eid;
 170         sg_item.transfer_context = skb;
 171         sg_item.vaddr = skb->data;
 172         sg_item.paddr = skb_cb->paddr;
 173         sg_item.len = skb->len;
 174
 175         ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);
 176         if (ret)
 177                 goto err_unmap;
 178
 179         return 0;
 180
 181 err_unmap:
 182         dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
 183 err_credits:
 184         if (ep->tx_credit_flow_enabled) {
 185                 spin_lock_bh(&htc->tx_lock);
 186                 ep->tx_credits += credits;
 187                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 188                            "htc ep %d reverted %d credits back (total %d)\n",
 189                            eid, credits, ep->tx_credits);
 190                 spin_unlock_bh(&htc->tx_lock);
 191
 192                 if (ep->ep_ops.ep_tx_credits)
 193                         ep->ep_ops.ep_tx_credits(htc->ar);
 194         }
 195 err_pull:
 196         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
 197         return ret;
 198 }
 199
 200 static int ath10k_htc_tx_completion_handler(struct ath10k *ar,
 201                                             struct sk_buff *skb)
 202 {
 203         struct ath10k_htc *htc = &ar->htc;
 204         struct ath10k_skb_cb *skb_cb;
 205         struct ath10k_htc_ep *ep;
 206
 207         if (WARN_ON_ONCE(!skb))
 208                 return 0;
 209
 210         skb_cb = ATH10K_SKB_CB(skb);
 211         ep = &htc->endpoint[skb_cb->eid];
 212
 213         ath10k_htc_notify_tx_completion(ep, skb);
 214         /* the skb now belongs to the completion handler */
 215
 216         return 0;
 217 }
 218
 219 /***********/
 220 /* Receive */
 221 /***********/
 222
 223 static void
 224 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 225                                  const struct ath10k_htc_credit_report *report,
 226                                  int len,
 227                                  enum ath10k_htc_ep_id eid)
 228 {
 229         struct ath10k *ar = htc->ar;
 230         struct ath10k_htc_ep *ep;
 231         int i, n_reports;
 232
 233         if (len % sizeof(*report))
 234                 ath10k_warn(ar, "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(ar, 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         struct ath10k *ar = htc->ar;
 264         int status = 0;
 265         struct ath10k_htc_record *record;
 266         u8 *orig_buffer;
 267         int orig_length;
 268         size_t len;
 269
 270         orig_buffer = buffer;
 271         orig_length = length;
 272
 273         while (length > 0) {
 274                 record = (struct ath10k_htc_record *)buffer;
 275
 276                 if (length < sizeof(record->hdr)) {
 277                         status = -EINVAL;
 278                         break;
 279                 }
 280
 281                 if (record->hdr.len > length) {
 282                         /* no room left in buffer for record */
 283                         ath10k_warn(ar, "Invalid record length: %d\n",
 284                                     record->hdr.len);
 285                         status = -EINVAL;
 286                         break;
 287                 }
 288
 289                 switch (record->hdr.id) {
 290                 case ATH10K_HTC_RECORD_CREDITS:
 291                         len = sizeof(struct ath10k_htc_credit_report);
 292                         if (record->hdr.len < len) {
 293                                 ath10k_warn(ar, "Credit report too long\n");
 294                                 status = -EINVAL;
 295                                 break;
 296                         }
 297                         ath10k_htc_process_credit_report(htc,
 298                                                          record->credit_report,
 299                                                          record->hdr.len,
 300                                                          src_eid);
 301                         break;
 302                 default:
 303                         ath10k_warn(ar, "Unhandled record: id:%d length:%d\n",
 304                                     record->hdr.id, record->hdr.len);
 305                         break;
 306                 }
 307
 308                 if (status)
 309                         break;
 310
 311                 /* multiple records may be present in a trailer */
 312                 buffer += sizeof(record->hdr) + record->hdr.len;
 313                 length -= sizeof(record->hdr) + record->hdr.len;
 314         }
 315
 316         if (status)
 317                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc rx bad trailer", "",
 318                                 orig_buffer, orig_length);
 319
 320         return status;
 321 }
 322
 323 static int ath10k_htc_rx_completion_handler(struct ath10k *ar,
 324                                             struct sk_buff *skb)
 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(ar, "HTC Rx: invalid eid %d\n", eid);
 343                 ath10k_dbg_dump(ar, 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(ar, "HTC rx frame too long, len: %zu\n",
 364                             payload_len + sizeof(*hdr));
 365                 ath10k_dbg_dump(ar, 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(ar, ATH10K_DBG_HTC,
 373                            "HTC Rx: insufficient length, got %d, expected %d\n",
 374                            skb->len, payload_len);
 375                 ath10k_dbg_dump(ar, 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(ar, "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(ar, "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(ar, 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(ar, "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         struct ath10k *ar = htc->ar;
 550         int i, status = 0;
 551         struct ath10k_htc_svc_conn_req conn_req;
 552         struct ath10k_htc_svc_conn_resp conn_resp;
 553         struct ath10k_htc_msg *msg;
 554         u16 message_id;
 555         u16 credit_count;
 556         u16 credit_size;
 557
 558         status = wait_for_completion_timeout(&htc->ctl_resp,
 559                                              ATH10K_HTC_WAIT_TIMEOUT_HZ);
 560         if (status == 0) {
 561                 /* Workaround: In some cases the PCI HIF doesn't
 562                  * receive interrupt for the control response message
 563                  * even if the buffer was completed. It is suspected
 564                  * iomap writes unmasking PCI CE irqs aren't propagated
 565                  * properly in KVM PCI-passthrough sometimes.
 566                  */
 567                 ath10k_warn(ar, "failed to receive control response completion, polling..\n");
 568
 569                 for (i = 0; i < CE_COUNT; i++)
 570                         ath10k_hif_send_complete_check(htc->ar, i, 1);
 571
 572                 status = wait_for_completion_timeout(&htc->ctl_resp,
 573                                                      ATH10K_HTC_WAIT_TIMEOUT_HZ);
 574
 575                 if (status == 0)
 576                         status = -ETIMEDOUT;
 577         }
 578
 579         if (status < 0) {
 580                 ath10k_err(ar, "ctl_resp never came in (%d)\n", status);
 581                 return status;
 582         }
 583
 584         if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 585                 ath10k_err(ar, "Invalid HTC ready msg len:%d\n",
 586                            htc->control_resp_len);
 587                 return -ECOMM;
 588         }
 589
 590         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 591         message_id   = __le16_to_cpu(msg->hdr.message_id);
 592         credit_count = __le16_to_cpu(msg->ready.credit_count);
 593         credit_size  = __le16_to_cpu(msg->ready.credit_size);
 594
 595         if (message_id != ATH10K_HTC_MSG_READY_ID) {
 596                 ath10k_err(ar, "Invalid HTC ready msg: 0x%x\n", message_id);
 597                 return -ECOMM;
 598         }
 599
 600         htc->total_transmit_credits = credit_count;
 601         htc->target_credit_size = credit_size;
 602
 603         ath10k_dbg(ar, ATH10K_DBG_HTC,
 604                    "Target ready! transmit resources: %d size:%d\n",
 605                    htc->total_transmit_credits,
 606                    htc->target_credit_size);
 607
 608         if ((htc->total_transmit_credits == 0) ||
 609             (htc->target_credit_size == 0)) {
 610                 ath10k_err(ar, "Invalid credit size received\n");
 611                 return -ECOMM;
 612         }
 613
 614         ath10k_htc_setup_target_buffer_assignments(htc);
 615
 616         /* setup our pseudo HTC control endpoint connection */
 617         memset(&conn_req, 0, sizeof(conn_req));
 618         memset(&conn_resp, 0, sizeof(conn_resp));
 619         conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
 620         conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
 621         conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
 622         conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
 623
 624         /* connect fake service */
 625         status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
 626         if (status) {
 627                 ath10k_err(ar, "could not connect to htc service (%d)\n",
 628                            status);
 629                 return status;
 630         }
 631
 632         return 0;
 633 }
 634
 635 int ath10k_htc_connect_service(struct ath10k_htc *htc,
 636                                struct ath10k_htc_svc_conn_req *conn_req,
 637                                struct ath10k_htc_svc_conn_resp *conn_resp)
 638 {
 639         struct ath10k *ar = htc->ar;
 640         struct ath10k_htc_msg *msg;
 641         struct ath10k_htc_conn_svc *req_msg;
 642         struct ath10k_htc_conn_svc_response resp_msg_dummy;
 643         struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
 644         enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
 645         struct ath10k_htc_ep *ep;
 646         struct sk_buff *skb;
 647         unsigned int max_msg_size = 0;
 648         int length, status;
 649         bool disable_credit_flow_ctrl = false;
 650         u16 message_id, service_id, flags = 0;
 651         u8 tx_alloc = 0;
 652
 653         /* special case for HTC pseudo control service */
 654         if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
 655                 disable_credit_flow_ctrl = true;
 656                 assigned_eid = ATH10K_HTC_EP_0;
 657                 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
 658                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 659                 goto setup;
 660         }
 661
 662         tx_alloc = ath10k_htc_get_credit_allocation(htc,
 663                                                     conn_req->service_id);
 664         if (!tx_alloc)
 665                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 666                            "boot htc service %s does not allocate target credits\n",
 667                            htc_service_name(conn_req->service_id));
 668
 669         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 670         if (!skb) {
 671                 ath10k_err(ar, "Failed to allocate HTC packet\n");
 672                 return -ENOMEM;
 673         }
 674
 675         length = sizeof(msg->hdr) + sizeof(msg->connect_service);
 676         skb_put(skb, length);
 677         memset(skb->data, 0, length);
 678
 679         msg = (struct ath10k_htc_msg *)skb->data;
 680         msg->hdr.message_id =
 681                 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
 682
 683         flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
 684
 685         /* Only enable credit flow control for WMI ctrl service */
 686         if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
 687                 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 688                 disable_credit_flow_ctrl = true;
 689         }
 690
 691         req_msg = &msg->connect_service;
 692         req_msg->flags = __cpu_to_le16(flags);
 693         req_msg->service_id = __cpu_to_le16(conn_req->service_id);
 694
 695         reinit_completion(&htc->ctl_resp);
 696
 697         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 698         if (status) {
 699                 kfree_skb(skb);
 700                 return status;
 701         }
 702
 703         /* wait for response */
 704         status = wait_for_completion_timeout(&htc->ctl_resp,
 705                                              ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
 706         if (status == 0) {
 707                 ath10k_err(ar, "Service connect timeout: %d\n", status);
 708                 return -ETIMEDOUT;
 709         }
 710
 711         /* we controlled the buffer creation, it's aligned */
 712         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 713         resp_msg = &msg->connect_service_response;
 714         message_id = __le16_to_cpu(msg->hdr.message_id);
 715         service_id = __le16_to_cpu(resp_msg->service_id);
 716
 717         if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 718             (htc->control_resp_len < sizeof(msg->hdr) +
 719              sizeof(msg->connect_service_response))) {
 720                 ath10k_err(ar, "Invalid resp message ID 0x%x", message_id);
 721                 return -EPROTO;
 722         }
 723
 724         ath10k_dbg(ar, ATH10K_DBG_HTC,
 725                    "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
 726                    htc_service_name(service_id),
 727                    resp_msg->status, resp_msg->eid);
 728
 729         conn_resp->connect_resp_code = resp_msg->status;
 730
 731         /* check response status */
 732         if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
 733                 ath10k_err(ar, "HTC Service %s connect request failed: 0x%x)\n",
 734                            htc_service_name(service_id),
 735                            resp_msg->status);
 736                 return -EPROTO;
 737         }
 738
 739         assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
 740         max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
 741
 742 setup:
 743
 744         if (assigned_eid >= ATH10K_HTC_EP_COUNT)
 745                 return -EPROTO;
 746
 747         if (max_msg_size == 0)
 748                 return -EPROTO;
 749
 750         ep = &htc->endpoint[assigned_eid];
 751         ep->eid = assigned_eid;
 752
 753         if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
 754                 return -EPROTO;
 755
 756         /* return assigned endpoint to caller */
 757         conn_resp->eid = assigned_eid;
 758         conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
 759
 760         /* setup the endpoint */
 761         ep->service_id = conn_req->service_id;
 762         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 763         ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
 764         ep->tx_credits = tx_alloc;
 765         ep->tx_credit_size = htc->target_credit_size;
 766         ep->tx_credits_per_max_message = ep->max_ep_message_len /
 767                                          htc->target_credit_size;
 768
 769         if (ep->max_ep_message_len % htc->target_credit_size)
 770                 ep->tx_credits_per_max_message++;
 771
 772         /* copy all the callbacks */
 773         ep->ep_ops = conn_req->ep_ops;
 774
 775         status = ath10k_hif_map_service_to_pipe(htc->ar,
 776                                                 ep->service_id,
 777                                                 &ep->ul_pipe_id,
 778                                                 &ep->dl_pipe_id,
 779                                                 &ep->ul_is_polled,
 780                                                 &ep->dl_is_polled);
 781         if (status)
 782                 return status;
 783
 784         ath10k_dbg(ar, ATH10K_DBG_BOOT,
 785                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 786                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 787                    ep->dl_pipe_id, ep->eid);
 788
 789         ath10k_dbg(ar, ATH10K_DBG_BOOT,
 790                    "boot htc ep %d ul polled %d dl polled %d\n",
 791                    ep->eid, ep->ul_is_polled, ep->dl_is_polled);
 792
 793         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 794                 ep->tx_credit_flow_enabled = false;
 795                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 796                            "boot htc service '%s' eid %d TX flow control disabled\n",
 797                            htc_service_name(ep->service_id), assigned_eid);
 798         }
 799
 800         return status;
 801 }
 802
 803 struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size)
 804 {
 805         struct sk_buff *skb;
 806
 807         skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
 808         if (!skb)
 809                 return NULL;
 810
 811         skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
 812
 813         /* FW/HTC requires 4-byte aligned streams */
 814         if (!IS_ALIGNED((unsigned long)skb->data, 4))
 815                 ath10k_warn(ar, "Unaligned HTC tx skb\n");
 816
 817         return skb;
 818 }
 819
 820 int ath10k_htc_start(struct ath10k_htc *htc)
 821 {
 822         struct ath10k *ar = htc->ar;
 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(ar, 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 /* registered target arrival callback from the HIF layer */
 850 int ath10k_htc_init(struct ath10k *ar)
 851 {
 852         struct ath10k_hif_cb htc_callbacks;
 853         struct ath10k_htc_ep *ep = NULL;
 854         struct ath10k_htc *htc = &ar->htc;
 855
 856         spin_lock_init(&htc->tx_lock);
 857
 858         ath10k_htc_reset_endpoint_states(htc);
 859
 860         /* setup HIF layer callbacks */
 861         htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
 862         htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
 863         htc->ar = ar;
 864
 865         /* Get HIF default pipe for HTC message exchange */
 866         ep = &htc->endpoint[ATH10K_HTC_EP_0];
 867
 868         ath10k_hif_set_callbacks(ar, &htc_callbacks);
 869         ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
 870
 871         init_completion(&htc->ctl_resp);
 872
 873         return 0;
 874 }