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 void ath10k_htc_control_tx_complete(struct ath10k *ar,
  27                                            struct sk_buff *skb)
  28 {
  29         kfree_skb(skb);
  30 }
  31
  32 static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar)
  33 {
  34         struct sk_buff *skb;
  35         struct ath10k_skb_cb *skb_cb;
  36
  37         skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE);
  38         if (!skb)
  39                 return NULL;
  40
  41         skb_reserve(skb, 20); /* FIXME: why 20 bytes? */
  42         WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
  43
  44         skb_cb = ATH10K_SKB_CB(skb);
  45         memset(skb_cb, 0, sizeof(*skb_cb));
  46
  47         ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb);
  48         return skb;
  49 }
  50
  51 static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,
  52                                              struct sk_buff *skb)
  53 {
  54         struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
  55
  56         dma_unmap_single(htc->ar->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
  57         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
  58 }
  59
  60 static void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
  61                                             struct sk_buff *skb)
  62 {
  63         struct ath10k *ar = ep->htc->ar;
  64
  65         ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
  66                    ep->eid, skb);
  67
  68         ath10k_htc_restore_tx_skb(ep->htc, skb);
  69
  70         if (!ep->ep_ops.ep_tx_complete) {
  71                 ath10k_warn(ar, "no tx handler for eid %d\n", ep->eid);
  72                 dev_kfree_skb_any(skb);
  73                 return;
  74         }
  75
  76         ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);
  77 }
  78
  79 static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
  80                                       struct sk_buff *skb)
  81 {
  82         struct ath10k_htc_hdr *hdr;
  83
  84         hdr = (struct ath10k_htc_hdr *)skb->data;
  85
  86         hdr->eid = ep->eid;
  87         hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
  88         hdr->flags = 0;
  89         hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
  90
  91         spin_lock_bh(&ep->htc->tx_lock);
  92         hdr->seq_no = ep->seq_no++;
  93         spin_unlock_bh(&ep->htc->tx_lock);
  94 }
  95
  96 int ath10k_htc_send(struct ath10k_htc *htc,
  97                     enum ath10k_htc_ep_id eid,
  98                     struct sk_buff *skb)
  99 {
 100         struct ath10k *ar = htc->ar;
 101         struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 102         struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
 103         struct ath10k_hif_sg_item sg_item;
 104         struct device *dev = htc->ar->dev;
 105         int credits = 0;
 106         int ret;
 107
 108         if (htc->ar->state == ATH10K_STATE_WEDGED)
 109                 return -ECOMM;
 110
 111         if (eid >= ATH10K_HTC_EP_COUNT) {
 112                 ath10k_warn(ar, "Invalid endpoint id: %d\n", eid);
 113                 return -ENOENT;
 114         }
 115
 116         skb_push(skb, sizeof(struct ath10k_htc_hdr));
 117
 118         if (ep->tx_credit_flow_enabled) {
 119                 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
 120                 spin_lock_bh(&htc->tx_lock);
 121                 if (ep->tx_credits < credits) {
 122                         spin_unlock_bh(&htc->tx_lock);
 123                         ret = -EAGAIN;
 124                         goto err_pull;
 125                 }
 126                 ep->tx_credits -= credits;
 127                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 128                            "htc ep %d consumed %d credits (total %d)\n",
 129                            eid, credits, ep->tx_credits);
 130                 spin_unlock_bh(&htc->tx_lock);
 131         }
 132
 133         ath10k_htc_prepare_tx_skb(ep, skb);
 134
 135         skb_cb->eid = eid;
 136         skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 137         ret = dma_mapping_error(dev, skb_cb->paddr);
 138         if (ret) {
 139                 ret = -EIO;
 140                 goto err_credits;
 141         }
 142
 143         sg_item.transfer_id = ep->eid;
 144         sg_item.transfer_context = skb;
 145         sg_item.vaddr = skb->data;
 146         sg_item.paddr = skb_cb->paddr;
 147         sg_item.len = skb->len;
 148
 149         ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);
 150         if (ret)
 151                 goto err_unmap;
 152
 153         return 0;
 154
 155 err_unmap:
 156         dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
 157 err_credits:
 158         if (ep->tx_credit_flow_enabled) {
 159                 spin_lock_bh(&htc->tx_lock);
 160                 ep->tx_credits += credits;
 161                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 162                            "htc ep %d reverted %d credits back (total %d)\n",
 163                            eid, credits, ep->tx_credits);
 164                 spin_unlock_bh(&htc->tx_lock);
 165
 166                 if (ep->ep_ops.ep_tx_credits)
 167                         ep->ep_ops.ep_tx_credits(htc->ar);
 168         }
 169 err_pull:
 170         skb_pull(skb, sizeof(struct ath10k_htc_hdr));
 171         return ret;
 172 }
 173
 174 void ath10k_htc_tx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
 175 {
 176         struct ath10k_htc *htc = &ar->htc;
 177         struct ath10k_skb_cb *skb_cb;
 178         struct ath10k_htc_ep *ep;
 179
 180         if (WARN_ON_ONCE(!skb))
 181                 return;
 182
 183         skb_cb = ATH10K_SKB_CB(skb);
 184         ep = &htc->endpoint[skb_cb->eid];
 185
 186         ath10k_htc_notify_tx_completion(ep, skb);
 187         /* the skb now belongs to the completion handler */
 188 }
 189 EXPORT_SYMBOL(ath10k_htc_tx_completion_handler);
 190
 191 /***********/
 192 /* Receive */
 193 /***********/
 194
 195 static void
 196 ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 197                                  const struct ath10k_htc_credit_report *report,
 198                                  int len,
 199                                  enum ath10k_htc_ep_id eid)
 200 {
 201         struct ath10k *ar = htc->ar;
 202         struct ath10k_htc_ep *ep;
 203         int i, n_reports;
 204
 205         if (len % sizeof(*report))
 206                 ath10k_warn(ar, "Uneven credit report len %d", len);
 207
 208         n_reports = len / sizeof(*report);
 209
 210         spin_lock_bh(&htc->tx_lock);
 211         for (i = 0; i < n_reports; i++, report++) {
 212                 if (report->eid >= ATH10K_HTC_EP_COUNT)
 213                         break;
 214
 215                 ep = &htc->endpoint[report->eid];
 216                 ep->tx_credits += report->credits;
 217
 218                 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
 219                            report->eid, report->credits, ep->tx_credits);
 220
 221                 if (ep->ep_ops.ep_tx_credits) {
 222                         spin_unlock_bh(&htc->tx_lock);
 223                         ep->ep_ops.ep_tx_credits(htc->ar);
 224                         spin_lock_bh(&htc->tx_lock);
 225                 }
 226         }
 227         spin_unlock_bh(&htc->tx_lock);
 228 }
 229
 230 static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
 231                                       u8 *buffer,
 232                                       int length,
 233                                       enum ath10k_htc_ep_id src_eid)
 234 {
 235         struct ath10k *ar = htc->ar;
 236         int status = 0;
 237         struct ath10k_htc_record *record;
 238         u8 *orig_buffer;
 239         int orig_length;
 240         size_t len;
 241
 242         orig_buffer = buffer;
 243         orig_length = length;
 244
 245         while (length > 0) {
 246                 record = (struct ath10k_htc_record *)buffer;
 247
 248                 if (length < sizeof(record->hdr)) {
 249                         status = -EINVAL;
 250                         break;
 251                 }
 252
 253                 if (record->hdr.len > length) {
 254                         /* no room left in buffer for record */
 255                         ath10k_warn(ar, "Invalid record length: %d\n",
 256                                     record->hdr.len);
 257                         status = -EINVAL;
 258                         break;
 259                 }
 260
 261                 switch (record->hdr.id) {
 262                 case ATH10K_HTC_RECORD_CREDITS:
 263                         len = sizeof(struct ath10k_htc_credit_report);
 264                         if (record->hdr.len < len) {
 265                                 ath10k_warn(ar, "Credit report too long\n");
 266                                 status = -EINVAL;
 267                                 break;
 268                         }
 269                         ath10k_htc_process_credit_report(htc,
 270                                                          record->credit_report,
 271                                                          record->hdr.len,
 272                                                          src_eid);
 273                         break;
 274                 default:
 275                         ath10k_warn(ar, "Unhandled record: id:%d length:%d\n",
 276                                     record->hdr.id, record->hdr.len);
 277                         break;
 278                 }
 279
 280                 if (status)
 281                         break;
 282
 283                 /* multiple records may be present in a trailer */
 284                 buffer += sizeof(record->hdr) + record->hdr.len;
 285                 length -= sizeof(record->hdr) + record->hdr.len;
 286         }
 287
 288         if (status)
 289                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc rx bad trailer", "",
 290                                 orig_buffer, orig_length);
 291
 292         return status;
 293 }
 294
 295 void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
 296 {
 297         int status = 0;
 298         struct ath10k_htc *htc = &ar->htc;
 299         struct ath10k_htc_hdr *hdr;
 300         struct ath10k_htc_ep *ep;
 301         u16 payload_len;
 302         u32 trailer_len = 0;
 303         size_t min_len;
 304         u8 eid;
 305         bool trailer_present;
 306
 307         hdr = (struct ath10k_htc_hdr *)skb->data;
 308         skb_pull(skb, sizeof(*hdr));
 309
 310         eid = hdr->eid;
 311
 312         if (eid >= ATH10K_HTC_EP_COUNT) {
 313                 ath10k_warn(ar, "HTC Rx: invalid eid %d\n", eid);
 314                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad header", "",
 315                                 hdr, sizeof(*hdr));
 316                 goto out;
 317         }
 318
 319         ep = &htc->endpoint[eid];
 320
 321         payload_len = __le16_to_cpu(hdr->len);
 322
 323         if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
 324                 ath10k_warn(ar, "HTC rx frame too long, len: %zu\n",
 325                             payload_len + sizeof(*hdr));
 326                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len", "",
 327                                 hdr, sizeof(*hdr));
 328                 goto out;
 329         }
 330
 331         if (skb->len < payload_len) {
 332                 ath10k_dbg(ar, ATH10K_DBG_HTC,
 333                            "HTC Rx: insufficient length, got %d, expected %d\n",
 334                            skb->len, payload_len);
 335                 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len",
 336                                 "", hdr, sizeof(*hdr));
 337                 goto out;
 338         }
 339
 340         /* get flags to check for trailer */
 341         trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
 342         if (trailer_present) {
 343                 u8 *trailer;
 344
 345                 trailer_len = hdr->trailer_len;
 346                 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
 347
 348                 if ((trailer_len < min_len) ||
 349                     (trailer_len > payload_len)) {
 350                         ath10k_warn(ar, "Invalid trailer length: %d\n",
 351                                     trailer_len);
 352                         goto out;
 353                 }
 354
 355                 trailer = (u8 *)hdr;
 356                 trailer += sizeof(*hdr);
 357                 trailer += payload_len;
 358                 trailer -= trailer_len;
 359                 status = ath10k_htc_process_trailer(htc, trailer,
 360                                                     trailer_len, hdr->eid);
 361                 if (status)
 362                         goto out;
 363
 364                 skb_trim(skb, skb->len - trailer_len);
 365         }
 366
 367         if (((int)payload_len - (int)trailer_len) <= 0)
 368                 /* zero length packet with trailer data, just drop these */
 369                 goto out;
 370
 371         if (eid == ATH10K_HTC_EP_0) {
 372                 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
 373
 374                 switch (__le16_to_cpu(msg->hdr.message_id)) {
 375                 case ATH10K_HTC_MSG_READY_ID:
 376                 case ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
 377                         /* handle HTC control message */
 378                         if (completion_done(&htc->ctl_resp)) {
 379                                 /*
 380                                  * this is a fatal error, target should not be
 381                                  * sending unsolicited messages on the ep 0
 382                                  */
 383                                 ath10k_warn(ar, "HTC rx ctrl still processing\n");
 384                                 complete(&htc->ctl_resp);
 385                                 goto out;
 386                         }
 387
 388                         htc->control_resp_len =
 389                                 min_t(int, skb->len,
 390                                       ATH10K_HTC_MAX_CTRL_MSG_LEN);
 391
 392                         memcpy(htc->control_resp_buffer, skb->data,
 393                                htc->control_resp_len);
 394
 395                         complete(&htc->ctl_resp);
 396                         break;
 397                 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 398                         htc->htc_ops.target_send_suspend_complete(ar);
 399                         break;
 400                 default:
 401                         ath10k_warn(ar, "ignoring unsolicited htc ep0 event\n");
 402                         break;
 403                 }
 404                 goto out;
 405         }
 406
 407         ath10k_dbg(ar, ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
 408                    eid, skb);
 409         ep->ep_ops.ep_rx_complete(ar, skb);
 410
 411         /* skb is now owned by the rx completion handler */
 412         skb = NULL;
 413 out:
 414         kfree_skb(skb);
 415 }
 416 EXPORT_SYMBOL(ath10k_htc_rx_completion_handler);
 417
 418 static void ath10k_htc_control_rx_complete(struct ath10k *ar,
 419                                            struct sk_buff *skb)
 420 {
 421         /* This is unexpected. FW is not supposed to send regular rx on this
 422          * endpoint. */
 423         ath10k_warn(ar, "unexpected htc rx\n");
 424         kfree_skb(skb);
 425 }
 426
 427 /***************/
 428 /* Init/Deinit */
 429 /***************/
 430
 431 static const char *htc_service_name(enum ath10k_htc_svc_id id)
 432 {
 433         switch (id) {
 434         case ATH10K_HTC_SVC_ID_RESERVED:
 435                 return "Reserved";
 436         case ATH10K_HTC_SVC_ID_RSVD_CTRL:
 437                 return "Control";
 438         case ATH10K_HTC_SVC_ID_WMI_CONTROL:
 439                 return "WMI";
 440         case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
 441                 return "DATA BE";
 442         case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
 443                 return "DATA BK";
 444         case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
 445                 return "DATA VI";
 446         case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
 447                 return "DATA VO";
 448         case ATH10K_HTC_SVC_ID_NMI_CONTROL:
 449                 return "NMI Control";
 450         case ATH10K_HTC_SVC_ID_NMI_DATA:
 451                 return "NMI Data";
 452         case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
 453                 return "HTT Data";
 454         case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
 455                 return "RAW";
 456         }
 457
 458         return "Unknown";
 459 }
 460
 461 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
 462 {
 463         struct ath10k_htc_ep *ep;
 464         int i;
 465
 466         for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
 467                 ep = &htc->endpoint[i];
 468                 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
 469                 ep->max_ep_message_len = 0;
 470                 ep->max_tx_queue_depth = 0;
 471                 ep->eid = i;
 472                 ep->htc = htc;
 473                 ep->tx_credit_flow_enabled = true;
 474         }
 475 }
 476
 477 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
 478 {
 479         struct ath10k_htc_svc_tx_credits *entry;
 480
 481         entry = &htc->service_tx_alloc[0];
 482
 483         /*
 484          * for PCIE allocate all credists/HTC buffers to WMI.
 485          * no buffers are used/required for data. data always
 486          * remains on host.
 487          */
 488         entry++;
 489         entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
 490         entry->credit_allocation = htc->total_transmit_credits;
 491 }
 492
 493 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
 494                                            u16 service_id)
 495 {
 496         u8 allocation = 0;
 497         int i;
 498
 499         for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
 500                 if (htc->service_tx_alloc[i].service_id == service_id)
 501                         allocation =
 502                             htc->service_tx_alloc[i].credit_allocation;
 503         }
 504
 505         return allocation;
 506 }
 507
 508 int ath10k_htc_wait_target(struct ath10k_htc *htc)
 509 {
 510         struct ath10k *ar = htc->ar;
 511         int i, status = 0;
 512         unsigned long time_left;
 513         struct ath10k_htc_svc_conn_req conn_req;
 514         struct ath10k_htc_svc_conn_resp conn_resp;
 515         struct ath10k_htc_msg *msg;
 516         u16 message_id;
 517         u16 credit_count;
 518         u16 credit_size;
 519
 520         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 521                                                 ATH10K_HTC_WAIT_TIMEOUT_HZ);
 522         if (!time_left) {
 523                 /* Workaround: In some cases the PCI HIF doesn't
 524                  * receive interrupt for the control response message
 525                  * even if the buffer was completed. It is suspected
 526                  * iomap writes unmasking PCI CE irqs aren't propagated
 527                  * properly in KVM PCI-passthrough sometimes.
 528                  */
 529                 ath10k_warn(ar, "failed to receive control response completion, polling..\n");
 530
 531                 for (i = 0; i < CE_COUNT; i++)
 532                         ath10k_hif_send_complete_check(htc->ar, i, 1);
 533
 534                 time_left =
 535                 wait_for_completion_timeout(&htc->ctl_resp,
 536                                             ATH10K_HTC_WAIT_TIMEOUT_HZ);
 537
 538                 if (!time_left)
 539                         status = -ETIMEDOUT;
 540         }
 541
 542         if (status < 0) {
 543                 ath10k_err(ar, "ctl_resp never came in (%d)\n", status);
 544                 return status;
 545         }
 546
 547         if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 548                 ath10k_err(ar, "Invalid HTC ready msg len:%d\n",
 549                            htc->control_resp_len);
 550                 return -ECOMM;
 551         }
 552
 553         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 554         message_id   = __le16_to_cpu(msg->hdr.message_id);
 555         credit_count = __le16_to_cpu(msg->ready.credit_count);
 556         credit_size  = __le16_to_cpu(msg->ready.credit_size);
 557
 558         if (message_id != ATH10K_HTC_MSG_READY_ID) {
 559                 ath10k_err(ar, "Invalid HTC ready msg: 0x%x\n", message_id);
 560                 return -ECOMM;
 561         }
 562
 563         htc->total_transmit_credits = credit_count;
 564         htc->target_credit_size = credit_size;
 565
 566         ath10k_dbg(ar, ATH10K_DBG_HTC,
 567                    "Target ready! transmit resources: %d size:%d\n",
 568                    htc->total_transmit_credits,
 569                    htc->target_credit_size);
 570
 571         if ((htc->total_transmit_credits == 0) ||
 572             (htc->target_credit_size == 0)) {
 573                 ath10k_err(ar, "Invalid credit size received\n");
 574                 return -ECOMM;
 575         }
 576
 577         ath10k_htc_setup_target_buffer_assignments(htc);
 578
 579         /* setup our pseudo HTC control endpoint connection */
 580         memset(&conn_req, 0, sizeof(conn_req));
 581         memset(&conn_resp, 0, sizeof(conn_resp));
 582         conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
 583         conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
 584         conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
 585         conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
 586
 587         /* connect fake service */
 588         status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
 589         if (status) {
 590                 ath10k_err(ar, "could not connect to htc service (%d)\n",
 591                            status);
 592                 return status;
 593         }
 594
 595         return 0;
 596 }
 597
 598 int ath10k_htc_connect_service(struct ath10k_htc *htc,
 599                                struct ath10k_htc_svc_conn_req *conn_req,
 600                                struct ath10k_htc_svc_conn_resp *conn_resp)
 601 {
 602         struct ath10k *ar = htc->ar;
 603         struct ath10k_htc_msg *msg;
 604         struct ath10k_htc_conn_svc *req_msg;
 605         struct ath10k_htc_conn_svc_response resp_msg_dummy;
 606         struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
 607         enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
 608         struct ath10k_htc_ep *ep;
 609         struct sk_buff *skb;
 610         unsigned int max_msg_size = 0;
 611         int length, status;
 612         unsigned long time_left;
 613         bool disable_credit_flow_ctrl = false;
 614         u16 message_id, service_id, flags = 0;
 615         u8 tx_alloc = 0;
 616
 617         /* special case for HTC pseudo control service */
 618         if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
 619                 disable_credit_flow_ctrl = true;
 620                 assigned_eid = ATH10K_HTC_EP_0;
 621                 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
 622                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 623                 goto setup;
 624         }
 625
 626         tx_alloc = ath10k_htc_get_credit_allocation(htc,
 627                                                     conn_req->service_id);
 628         if (!tx_alloc)
 629                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 630                            "boot htc service %s does not allocate target credits\n",
 631                            htc_service_name(conn_req->service_id));
 632
 633         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 634         if (!skb) {
 635                 ath10k_err(ar, "Failed to allocate HTC packet\n");
 636                 return -ENOMEM;
 637         }
 638
 639         length = sizeof(msg->hdr) + sizeof(msg->connect_service);
 640         skb_put(skb, length);
 641         memset(skb->data, 0, length);
 642
 643         msg = (struct ath10k_htc_msg *)skb->data;
 644         msg->hdr.message_id =
 645                 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
 646
 647         flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
 648
 649         /* Only enable credit flow control for WMI ctrl service */
 650         if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
 651                 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 652                 disable_credit_flow_ctrl = true;
 653         }
 654
 655         req_msg = &msg->connect_service;
 656         req_msg->flags = __cpu_to_le16(flags);
 657         req_msg->service_id = __cpu_to_le16(conn_req->service_id);
 658
 659         reinit_completion(&htc->ctl_resp);
 660
 661         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 662         if (status) {
 663                 kfree_skb(skb);
 664                 return status;
 665         }
 666
 667         /* wait for response */
 668         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 669                                                 ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
 670         if (!time_left) {
 671                 ath10k_err(ar, "Service connect timeout\n");
 672                 return -ETIMEDOUT;
 673         }
 674
 675         /* we controlled the buffer creation, it's aligned */
 676         msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 677         resp_msg = &msg->connect_service_response;
 678         message_id = __le16_to_cpu(msg->hdr.message_id);
 679         service_id = __le16_to_cpu(resp_msg->service_id);
 680
 681         if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 682             (htc->control_resp_len < sizeof(msg->hdr) +
 683              sizeof(msg->connect_service_response))) {
 684                 ath10k_err(ar, "Invalid resp message ID 0x%x", message_id);
 685                 return -EPROTO;
 686         }
 687
 688         ath10k_dbg(ar, ATH10K_DBG_HTC,
 689                    "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
 690                    htc_service_name(service_id),
 691                    resp_msg->status, resp_msg->eid);
 692
 693         conn_resp->connect_resp_code = resp_msg->status;
 694
 695         /* check response status */
 696         if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
 697                 ath10k_err(ar, "HTC Service %s connect request failed: 0x%x)\n",
 698                            htc_service_name(service_id),
 699                            resp_msg->status);
 700                 return -EPROTO;
 701         }
 702
 703         assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
 704         max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
 705
 706 setup:
 707
 708         if (assigned_eid >= ATH10K_HTC_EP_COUNT)
 709                 return -EPROTO;
 710
 711         if (max_msg_size == 0)
 712                 return -EPROTO;
 713
 714         ep = &htc->endpoint[assigned_eid];
 715         ep->eid = assigned_eid;
 716
 717         if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
 718                 return -EPROTO;
 719
 720         /* return assigned endpoint to caller */
 721         conn_resp->eid = assigned_eid;
 722         conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
 723
 724         /* setup the endpoint */
 725         ep->service_id = conn_req->service_id;
 726         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 727         ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
 728         ep->tx_credits = tx_alloc;
 729         ep->tx_credit_size = htc->target_credit_size;
 730         ep->tx_credits_per_max_message = ep->max_ep_message_len /
 731                                          htc->target_credit_size;
 732
 733         if (ep->max_ep_message_len % htc->target_credit_size)
 734                 ep->tx_credits_per_max_message++;
 735
 736         /* copy all the callbacks */
 737         ep->ep_ops = conn_req->ep_ops;
 738
 739         status = ath10k_hif_map_service_to_pipe(htc->ar,
 740                                                 ep->service_id,
 741                                                 &ep->ul_pipe_id,
 742                                                 &ep->dl_pipe_id);
 743         if (status)
 744                 return status;
 745
 746         ath10k_dbg(ar, ATH10K_DBG_BOOT,
 747                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 748                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 749                    ep->dl_pipe_id, ep->eid);
 750
 751         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 752                 ep->tx_credit_flow_enabled = false;
 753                 ath10k_dbg(ar, ATH10K_DBG_BOOT,
 754                            "boot htc service '%s' eid %d TX flow control disabled\n",
 755                            htc_service_name(ep->service_id), assigned_eid);
 756         }
 757
 758         return status;
 759 }
 760
 761 struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size)
 762 {
 763         struct sk_buff *skb;
 764
 765         skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
 766         if (!skb)
 767                 return NULL;
 768
 769         skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
 770
 771         /* FW/HTC requires 4-byte aligned streams */
 772         if (!IS_ALIGNED((unsigned long)skb->data, 4))
 773                 ath10k_warn(ar, "Unaligned HTC tx skb\n");
 774
 775         return skb;
 776 }
 777
 778 int ath10k_htc_start(struct ath10k_htc *htc)
 779 {
 780         struct ath10k *ar = htc->ar;
 781         struct sk_buff *skb;
 782         int status = 0;
 783         struct ath10k_htc_msg *msg;
 784
 785         skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
 786         if (!skb)
 787                 return -ENOMEM;
 788
 789         skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
 790         memset(skb->data, 0, skb->len);
 791
 792         msg = (struct ath10k_htc_msg *)skb->data;
 793         msg->hdr.message_id =
 794                 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
 795
 796         ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
 797
 798         status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
 799         if (status) {
 800                 kfree_skb(skb);
 801                 return status;
 802         }
 803
 804         return 0;
 805 }
 806
 807 /* registered target arrival callback from the HIF layer */
 808 int ath10k_htc_init(struct ath10k *ar)
 809 {
 810         struct ath10k_htc_ep *ep = NULL;
 811         struct ath10k_htc *htc = &ar->htc;
 812
 813         spin_lock_init(&htc->tx_lock);
 814
 815         ath10k_htc_reset_endpoint_states(htc);
 816
 817         htc->ar = ar;
 818
 819         /* Get HIF default pipe for HTC message exchange */
 820         ep = &htc->endpoint[ATH10K_HTC_EP_0];
 821
 822         ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
 823
 824         init_completion(&htc->ctl_resp);
 825
 826         return 0;
 827 }