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 void ath10k_htc_tx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
 185 {
 186         struct ath10k_htc *htc = &ar->htc;
 187         struct ath10k_skb_cb *skb_cb;
 188         struct ath10k_htc_ep *ep;
 189
 190         if (WARN_ON_ONCE(!skb))
 191                 return;
 192
 193         skb_cb = ATH10K_SKB_CB(skb);
 194         ep = &htc->endpoint[skb_cb->eid];
 195
 196         ath10k_htc_notify_tx_completion(ep, skb);
 197         /* the skb now belongs to the completion handler */
 198 }
 199 EXPORT_SYMBOL(ath10k_htc_tx_completion_handler);
 200
 201 /***********/
 202 /* Receive */
 203 /***********/
 204
 205 static void
 206 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 207                                  const struct ath10k_htc_credit_report *report,
 208                                  int len,
 209                                  enum ath10k_htc_ep_id eid)
 210 {
 211         struct ath10k *ar = htc->ar;
 212         struct ath10k_htc_ep *ep;
 213         int i, n_reports;
 214
 215         if (len % sizeof(*report))
 216                 ath10k_warn(ar, "Uneven credit report len %d", len);
 217
 218         n_reports = len / sizeof(*report);
 219
 220         spin_lock_bh(&htc->tx_lock);
 221         for (i = 0; i < n_reports; i++, report++) {
 222                 if (report->eid >= ATH10K_HTC_EP_COUNT)
 223                         break;
 224
 225                 ep = &htc->endpoint[report->eid];
 226                 ep->tx_credits += report->credits;
 227
 228                 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
 229                            report->eid, report->credits, ep->tx_credits);
 230
 231                 if (ep->ep_ops.ep_tx_credits) {
 232                         spin_unlock_bh(&htc->tx_lock);
 233                         ep->ep_ops.ep_tx_credits(htc->ar);
 234                         spin_lock_bh(&htc->tx_lock);
 235                 }
 236         }
 237         spin_unlock_bh(&htc->tx_lock);
 238 }
 239
 240 static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
 241                                       u8 *buffer,
 242                                       int length,
 243                                       enum ath10k_htc_ep_id src_eid)
 244 {
 245         struct ath10k *ar = htc->ar;
 246         int status = 0;
 247         struct ath10k_htc_record *record;
 248         u8 *orig_buffer;
 249         int orig_length;
 250         size_t len;
 251
 252         orig_buffer = buffer;
 253         orig_length = length;
 254
 255         while (length > 0) {
 256                 record = (struct ath10k_htc_record *)buffer;
 257
 258                 if (length < sizeof(record->hdr)) {
 259                         status = -EINVAL;
 260                         break;
 261                 }
 262
 263                 if (record->hdr.len > length) {
 264                         /* no room left in buffer for record */
 265                         ath10k_warn(ar, "Invalid record length: %d\n",
 266                                     record->hdr.len);
 267                         status = -EINVAL;
 268                         break;
 269                 }
 270
 271                 switch (record->hdr.id) {
 272                 case ATH10K_HTC_RECORD_CREDITS:
 273                         len = sizeof(struct ath10k_htc_credit_report);
 274                         if (record->hdr.len < len) {
 275                                 ath10k_warn(ar, "Credit report too long\n");
 276                                 status = -EINVAL;
 277                                 break;
 278                         }
 279                         ath10k_htc_process_credit_report(htc,
 280                                                          record->credit_report,
 281                                                          record->hdr.len,
 282                                                          src_eid);
 283                         break;
 284                 default:
 285                         ath10k_warn(ar, "Unhandled record: id:%d length:%d\n",
 286                                     record->hdr.id, record->hdr.len);
 287                         break;
 288                 }
 289
 290                 if (status)
 291                         break;
 292
 293                 /* multiple records may be present in a trailer */
 294                 buffer += sizeof(record->hdr) + record->hdr.len;
 295                 length -= sizeof(record->hdr) + record->hdr.len;
 296         }
 297
 298         if (status)
 299                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc rx bad trailer", "",
 300                                 orig_buffer, orig_length);
 301
 302         return status;
 303 }
 304
 305 void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
 306 {
 307         int status = 0;
 308         struct ath10k_htc *htc = &ar->htc;
 309         struct ath10k_htc_hdr *hdr;
 310         struct ath10k_htc_ep *ep;
 311         u16 payload_len;
 312         u32 trailer_len = 0;
 313         size_t min_len;
 314         u8 eid;
 315         bool trailer_present;
 316
 317         hdr = (struct ath10k_htc_hdr *)skb->data;
 318         skb_pull(skb, sizeof(*hdr));
 319
 320         eid = hdr->eid;
 321
 322         if (eid >= ATH10K_HTC_EP_COUNT) {
 323                 ath10k_warn(ar, "HTC Rx: invalid eid %d\n", eid);
 324                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad header", "",
 325                                 hdr, sizeof(*hdr));
 326                 goto out;
 327         }
 328
 329         ep = &htc->endpoint[eid];
 330
 331         /*
 332          * If this endpoint that received a message from the target has
 333          * a to-target HIF pipe whose send completions are polled rather
 334          * than interrupt-driven, this is a good point to ask HIF to check
 335          * whether it has any completed sends to handle.
 336          */
 337         if (ep->ul_is_polled)
 338                 ath10k_htc_send_complete_check(ep, 1);
 339
 340         payload_len = __le16_to_cpu(hdr->len);
 341
 342         if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
 343                 ath10k_warn(ar, "HTC rx frame too long, len: %zu\n",
 344                             payload_len + sizeof(*hdr));
 345                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len", "",
 346                                 hdr, sizeof(*hdr));
 347                 goto out;
 348         }
 349
 350         if (skb->len < payload_len) {
 351                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 352                            "HTC Rx: insufficient length, got %d, expected %d\n",
 353                            skb->len, payload_len);
 354                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len",
 355                                 "", hdr, sizeof(*hdr));
 356                 goto out;
 357         }
 358
 359         /* get flags to check for trailer */
 360         trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
 361         if (trailer_present) {
 362                 u8 *trailer;
 363
 364                 trailer_len = hdr->trailer_len;
 365                 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
 366
 367                 if ((trailer_len < min_len) ||
 368                     (trailer_len > payload_len)) {
 369                         ath10k_warn(ar, "Invalid trailer length: %d\n",
 370                                     trailer_len);
 371                         goto out;
 372                 }
 373
 374                 trailer = (u8 *)hdr;
 375                 trailer += sizeof(*hdr);
 376                 trailer += payload_len;
 377                 trailer -= trailer_len;
 378                 status = ath10k_htc_process_trailer(htc, trailer,
 379                                                     trailer_len, hdr->eid);
 380                 if (status)
 381                         goto out;
 382
 383                 skb_trim(skb, skb->len - trailer_len);
 384         }
 385
 386         if (((int)payload_len - (int)trailer_len) <= 0)
 387                 /* zero length packet with trailer data, just drop these */
 388                 goto out;
 389
 390         if (eid == ATH10K_HTC_EP_0) {
 391                 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
 392
 393                 switch (__le16_to_cpu(msg->hdr.message_id)) {
 394                 case ATH10K_HTC_MSG_READY_ID:
 395                 case ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
 396                         /* handle HTC control message */
 397                         if (completion_done(&htc->ctl_resp)) {
 398                                 /*
 399                                  * this is a fatal error, target should not be
 400                                  * sending unsolicited messages on the ep 0
 401                                  */
 402                                 ath10k_warn(ar, "HTC rx ctrl still processing\n");
 403                                 complete(&htc->ctl_resp);
 404                                 goto out;
 405                         }
 406
 407                         htc->control_resp_len =
 408                                 min_t(int, skb->len,
 409                                       ATH10K_HTC_MAX_CTRL_MSG_LEN);
 410
 411                         memcpy(htc->control_resp_buffer, skb->data,
 412                                htc->control_resp_len);
 413
 414                         complete(&htc->ctl_resp);
 415                         break;
 416                 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 417                         htc->htc_ops.target_send_suspend_complete(ar);
 418                         break;
 419                 default:
 420                         ath10k_warn(ar, "ignoring unsolicited htc ep0 event\n");
 421                         break;
 422                 }
 423                 goto out;
 424         }
 425
 426         ath10k_dbg(ar, ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
 427                    eid, skb);
 428         ep->ep_ops.ep_rx_complete(ar, skb);
 429
 430         /* skb is now owned by the rx completion handler */
 431         skb = NULL;
 432 out:
 433         kfree_skb(skb);
 434 }
 435 EXPORT_SYMBOL(ath10k_htc_rx_completion_handler);
 436
 437 static void ath10k_htc_control_rx_complete(struct ath10k *ar,
 438                                            struct sk_buff *skb)
 439 {
 440         /* This is unexpected. FW is not supposed to send regular rx on this
 441          * endpoint. */
 442         ath10k_warn(ar, "unexpected htc rx\n");
 443         kfree_skb(skb);
 444 }
 445
 446 /***************/
 447 /* Init/Deinit */
 448 /***************/
 449
 450 static const char *htc_service_name(enum ath10k_htc_svc_id id)
 451 {
 452         switch (id) {
 453         case ATH10K_HTC_SVC_ID_RESERVED:
 454                 return "Reserved";
 455         case ATH10K_HTC_SVC_ID_RSVD_CTRL:
 456                 return "Control";
 457         case ATH10K_HTC_SVC_ID_WMI_CONTROL:
 458                 return "WMI";
 459         case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
 460                 return "DATA BE";
 461         case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
 462                 return "DATA BK";
 463         case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
 464                 return "DATA VI";
 465         case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
 466                 return "DATA VO";
 467         case ATH10K_HTC_SVC_ID_NMI_CONTROL:
 468                 return "NMI Control";
 469         case ATH10K_HTC_SVC_ID_NMI_DATA:
 470                 return "NMI Data";
 471         case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
 472                 return "HTT Data";
 473         case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
 474                 return "RAW";
 475         }
 476
 477         return "Unknown";
 478 }
 479
 480 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
 481 {
 482         struct ath10k_htc_ep *ep;
 483         int i;
 484
 485         for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
 486                 ep = &htc->endpoint[i];
 487                 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
 488                 ep->max_ep_message_len = 0;
 489                 ep->max_tx_queue_depth = 0;
 490                 ep->eid = i;
 491                 ep->htc = htc;
 492                 ep->tx_credit_flow_enabled = true;
 493         }
 494 }
 495
 496 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
 497 {
 498         struct ath10k_htc_svc_tx_credits *entry;
 499
 500         entry = &htc->service_tx_alloc[0];
 501
 502         /*
 503          * for PCIE allocate all credists/HTC buffers to WMI.
 504          * no buffers are used/required for data. data always
 505          * remains on host.
 506          */
 507         entry++;
 508         entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
 509         entry->credit_allocation = htc->total_transmit_credits;
 510 }
 511
 512 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
 513                                            u16 service_id)
 514 {
 515         u8 allocation = 0;
 516         int i;
 517
 518         for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
 519                 if (htc->service_tx_alloc[i].service_id == service_id)
 520                         allocation =
 521                             htc->service_tx_alloc[i].credit_allocation;
 522         }
 523
 524         return allocation;
 525 }
 526
 527 int ath10k_htc_wait_target(struct ath10k_htc *htc)
 528 {
 529         struct ath10k *ar = htc->ar;
 530         int i, status = 0;
 531         unsigned long time_left;
 532         struct ath10k_htc_svc_conn_req conn_req;
 533         struct ath10k_htc_svc_conn_resp conn_resp;
 534         struct ath10k_htc_msg *msg;
 535         u16 message_id;
 536         u16 credit_count;
 537         u16 credit_size;
 538
 539         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 540                                                 ATH10K_HTC_WAIT_TIMEOUT_HZ);
 541         if (!time_left) {
 542                 /* Workaround: In some cases the PCI HIF doesn't
 543                  * receive interrupt for the control response message
 544                  * even if the buffer was completed. It is suspected
 545                  * iomap writes unmasking PCI CE irqs aren't propagated
 546                  * properly in KVM PCI-passthrough sometimes.
 547                  */
 548                 ath10k_warn(ar, "failed to receive control response completion, polling..\n");
 549
 550                 for (i = 0; i < CE_COUNT; i++)
 551                         ath10k_hif_send_complete_check(htc->ar, i, 1);
 552
 553                 time_left =
 554                 wait_for_completion_timeout(&htc->ctl_resp,
 555                                             ATH10K_HTC_WAIT_TIMEOUT_HZ);
 556
 557                 if (!time_left)
 558                         status = -ETIMEDOUT;
 559         }
 560
 561         if (status < 0) {
 562                 ath10k_err(ar, "ctl_resp never came in (%d)\n", status);
 563                 return status;
 564         }
 565
 566         if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 567                 ath10k_err(ar, "Invalid HTC ready msg len:%d\n",
 568                            htc->control_resp_len);
 569                 return -ECOMM;
 570         }
 571
 572         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 573         message_id   = __le16_to_cpu(msg->hdr.message_id);
 574         credit_count = __le16_to_cpu(msg->ready.credit_count);
 575         credit_size  = __le16_to_cpu(msg->ready.credit_size);
 576
 577         if (message_id != ATH10K_HTC_MSG_READY_ID) {
 578                 ath10k_err(ar, "Invalid HTC ready msg: 0x%x\n", message_id);
 579                 return -ECOMM;
 580         }
 581
 582         htc->total_transmit_credits = credit_count;
 583         htc->target_credit_size = credit_size;
 584
 585         ath10k_dbg(ar, ATH10K_DBG_HTC,
 586                    "Target ready! transmit resources: %d size:%d\n",
 587                    htc->total_transmit_credits,
 588                    htc->target_credit_size);
 589
 590         if ((htc->total_transmit_credits == 0) ||
 591             (htc->target_credit_size == 0)) {
 592                 ath10k_err(ar, "Invalid credit size received\n");
 593                 return -ECOMM;
 594         }
 595
 596         ath10k_htc_setup_target_buffer_assignments(htc);
 597
 598         /* setup our pseudo HTC control endpoint connection */
 599         memset(&conn_req, 0, sizeof(conn_req));
 600         memset(&conn_resp, 0, sizeof(conn_resp));
 601         conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
 602         conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
 603         conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
 604         conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
 605
 606         /* connect fake service */
 607         status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
 608         if (status) {
 609                 ath10k_err(ar, "could not connect to htc service (%d)\n",
 610                            status);
 611                 return status;
 612         }
 613
 614         return 0;
 615 }
 616
 617 int ath10k_htc_connect_service(struct ath10k_htc *htc,
 618                                struct ath10k_htc_svc_conn_req *conn_req,
 619                                struct ath10k_htc_svc_conn_resp *conn_resp)
 620 {
 621         struct ath10k *ar = htc->ar;
 622         struct ath10k_htc_msg *msg;
 623         struct ath10k_htc_conn_svc *req_msg;
 624         struct ath10k_htc_conn_svc_response resp_msg_dummy;
 625         struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
 626         enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
 627         struct ath10k_htc_ep *ep;
 628         struct sk_buff *skb;
 629         unsigned int max_msg_size = 0;
 630         int length, status;
 631         unsigned long time_left;
 632         bool disable_credit_flow_ctrl = false;
 633         u16 message_id, service_id, flags = 0;
 634         u8 tx_alloc = 0;
 635
 636         /* special case for HTC pseudo control service */
 637         if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
 638                 disable_credit_flow_ctrl = true;
 639                 assigned_eid = ATH10K_HTC_EP_0;
 640                 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
 641                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 642                 goto setup;
 643         }
 644
 645         tx_alloc = ath10k_htc_get_credit_allocation(htc,
 646                                                     conn_req->service_id);
 647         if (!tx_alloc)
 648                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 649                            "boot htc service %s does not allocate target credits\n",
 650                            htc_service_name(conn_req->service_id));
 651
 652         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 653         if (!skb) {
 654                 ath10k_err(ar, "Failed to allocate HTC packet\n");
 655                 return -ENOMEM;
 656         }
 657
 658         length = sizeof(msg->hdr) + sizeof(msg->connect_service);
 659         skb_put(skb, length);
 660         memset(skb->data, 0, length);
 661
 662         msg = (struct ath10k_htc_msg *)skb->data;
 663         msg->hdr.message_id =
 664                 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
 665
 666         flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
 667
 668         /* Only enable credit flow control for WMI ctrl service */
 669         if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
 670                 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 671                 disable_credit_flow_ctrl = true;
 672         }
 673
 674         req_msg = &msg->connect_service;
 675         req_msg->flags = __cpu_to_le16(flags);
 676         req_msg->service_id = __cpu_to_le16(conn_req->service_id);
 677
 678         reinit_completion(&htc->ctl_resp);
 679
 680         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 681         if (status) {
 682                 kfree_skb(skb);
 683                 return status;
 684         }
 685
 686         /* wait for response */
 687         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 688                                                 ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
 689         if (!time_left) {
 690                 ath10k_err(ar, "Service connect timeout\n");
 691                 return -ETIMEDOUT;
 692         }
 693
 694         /* we controlled the buffer creation, it's aligned */
 695         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 696         resp_msg = &msg->connect_service_response;
 697         message_id = __le16_to_cpu(msg->hdr.message_id);
 698         service_id = __le16_to_cpu(resp_msg->service_id);
 699
 700         if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 701             (htc->control_resp_len < sizeof(msg->hdr) +
 702              sizeof(msg->connect_service_response))) {
 703                 ath10k_err(ar, "Invalid resp message ID 0x%x", message_id);
 704                 return -EPROTO;
 705         }
 706
 707         ath10k_dbg(ar, ATH10K_DBG_HTC,
 708                    "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
 709                    htc_service_name(service_id),
 710                    resp_msg->status, resp_msg->eid);
 711
 712         conn_resp->connect_resp_code = resp_msg->status;
 713
 714         /* check response status */
 715         if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
 716                 ath10k_err(ar, "HTC Service %s connect request failed: 0x%x)\n",
 717                            htc_service_name(service_id),
 718                            resp_msg->status);
 719                 return -EPROTO;
 720         }
 721
 722         assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
 723         max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
 724
 725 setup:
 726
 727         if (assigned_eid >= ATH10K_HTC_EP_COUNT)
 728                 return -EPROTO;
 729
 730         if (max_msg_size == 0)
 731                 return -EPROTO;
 732
 733         ep = &htc->endpoint[assigned_eid];
 734         ep->eid = assigned_eid;
 735
 736         if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
 737                 return -EPROTO;
 738
 739         /* return assigned endpoint to caller */
 740         conn_resp->eid = assigned_eid;
 741         conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
 742
 743         /* setup the endpoint */
 744         ep->service_id = conn_req->service_id;
 745         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 746         ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
 747         ep->tx_credits = tx_alloc;
 748         ep->tx_credit_size = htc->target_credit_size;
 749         ep->tx_credits_per_max_message = ep->max_ep_message_len /
 750                                          htc->target_credit_size;
 751
 752         if (ep->max_ep_message_len % htc->target_credit_size)
 753                 ep->tx_credits_per_max_message++;
 754
 755         /* copy all the callbacks */
 756         ep->ep_ops = conn_req->ep_ops;
 757
 758         status = ath10k_hif_map_service_to_pipe(htc->ar,
 759                                                 ep->service_id,
 760                                                 &ep->ul_pipe_id,
 761                                                 &ep->dl_pipe_id,
 762                                                 &ep->ul_is_polled,
 763                                                 &ep->dl_is_polled);
 764         if (status)
 765                 return status;
 766
 767         ath10k_dbg(ar, ATH10K_DBG_BOOT,
 768                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 769                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 770                    ep->dl_pipe_id, ep->eid);
 771
 772         ath10k_dbg(ar, ATH10K_DBG_BOOT,
 773                    "boot htc ep %d ul polled %d dl polled %d\n",
 774                    ep->eid, ep->ul_is_polled, ep->dl_is_polled);
 775
 776         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 777                 ep->tx_credit_flow_enabled = false;
 778                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 779                            "boot htc service '%s' eid %d TX flow control disabled\n",
 780                            htc_service_name(ep->service_id), assigned_eid);
 781         }
 782
 783         return status;
 784 }
 785
 786 struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size)
 787 {
 788         struct sk_buff *skb;
 789
 790         skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
 791         if (!skb)
 792                 return NULL;
 793
 794         skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
 795
 796         /* FW/HTC requires 4-byte aligned streams */
 797         if (!IS_ALIGNED((unsigned long)skb->data, 4))
 798                 ath10k_warn(ar, "Unaligned HTC tx skb\n");
 799
 800         return skb;
 801 }
 802
 803 int ath10k_htc_start(struct ath10k_htc *htc)
 804 {
 805         struct ath10k *ar = htc->ar;
 806         struct sk_buff *skb;
 807         int status = 0;
 808         struct ath10k_htc_msg *msg;
 809
 810         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 811         if (!skb)
 812                 return -ENOMEM;
 813
 814         skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
 815         memset(skb->data, 0, skb->len);
 816
 817         msg = (struct ath10k_htc_msg *)skb->data;
 818         msg->hdr.message_id =
 819                 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
 820
 821         ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
 822
 823         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 824         if (status) {
 825                 kfree_skb(skb);
 826                 return status;
 827         }
 828
 829         return 0;
 830 }
 831
 832 /* registered target arrival callback from the HIF layer */
 833 int ath10k_htc_init(struct ath10k *ar)
 834 {
 835         struct ath10k_htc_ep *ep = NULL;
 836         struct ath10k_htc *htc = &ar->htc;
 837
 838         spin_lock_init(&htc->tx_lock);
 839
 840         ath10k_htc_reset_endpoint_states(htc);
 841
 842         htc->ar = ar;
 843
 844         /* Get HIF default pipe for HTC message exchange */
 845         ep = &htc->endpoint[ATH10K_HTC_EP_0];
 846
 847         ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
 848
 849         init_completion(&htc->ctl_resp);
 850
 851         return 0;
 852 }