drivers/net/wireless/ath/ath12k/htc.c

   1 // SPDX-License-Identifier: BSD-3-Clause-Clear
   2 /*
   3  * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
   5  */
   6 #include <linux/skbuff.h>
   7 #include <linux/ctype.h>
   8
   9 #include "debug.h"
  10 #include "hif.h"
  11
  12 struct sk_buff *ath12k_htc_alloc_skb(struct ath12k_base *ab, int size)
  13 {
  14         struct sk_buff *skb;
  15
  16         skb = dev_alloc_skb(size + sizeof(struct ath12k_htc_hdr));
  17         if (!skb)
  18                 return NULL;
  19
  20         skb_reserve(skb, sizeof(struct ath12k_htc_hdr));
  21
  22         /* FW/HTC requires 4-byte aligned streams */
  23         if (!IS_ALIGNED((unsigned long)skb->data, 4))
  24                 ath12k_warn(ab, "Unaligned HTC tx skb\n");
  25
  26         return skb;
  27 }
  28
  29 static void ath12k_htc_control_tx_complete(struct ath12k_base *ab,
  30                                            struct sk_buff *skb)
  31 {
  32         kfree_skb(skb);
  33 }
  34
  35 static struct sk_buff *ath12k_htc_build_tx_ctrl_skb(void)
  36 {
  37         struct sk_buff *skb;
  38         struct ath12k_skb_cb *skb_cb;
  39
  40         skb = dev_alloc_skb(ATH12K_HTC_CONTROL_BUFFER_SIZE);
  41         if (!skb)
  42                 return NULL;
  43
  44         skb_reserve(skb, sizeof(struct ath12k_htc_hdr));
  45         WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));
  46
  47         skb_cb = ATH12K_SKB_CB(skb);
  48         memset(skb_cb, 0, sizeof(*skb_cb));
  49
  50         return skb;
  51 }
  52
  53 static void ath12k_htc_prepare_tx_skb(struct ath12k_htc_ep *ep,
  54                                       struct sk_buff *skb)
  55 {
  56         struct ath12k_htc_hdr *hdr;
  57
  58         hdr = (struct ath12k_htc_hdr *)skb->data;
  59
  60         memset(hdr, 0, sizeof(*hdr));
  61         hdr->htc_info = le32_encode_bits(ep->eid, HTC_HDR_ENDPOINTID) |
  62                         le32_encode_bits((skb->len - sizeof(*hdr)),
  63                                          HTC_HDR_PAYLOADLEN);
  64
  65         if (ep->tx_credit_flow_enabled)
  66                 hdr->htc_info |= le32_encode_bits(ATH12K_HTC_FLAG_NEED_CREDIT_UPDATE,
  67                                                   HTC_HDR_FLAGS);
  68
  69         spin_lock_bh(&ep->htc->tx_lock);
  70         hdr->ctrl_info = le32_encode_bits(ep->seq_no++, HTC_HDR_CONTROLBYTES1);
  71         spin_unlock_bh(&ep->htc->tx_lock);
  72 }
  73
  74 int ath12k_htc_send(struct ath12k_htc *htc,
  75                     enum ath12k_htc_ep_id eid,
  76                     struct sk_buff *skb)
  77 {
  78         struct ath12k_htc_ep *ep = &htc->endpoint[eid];
  79         struct ath12k_skb_cb *skb_cb = ATH12K_SKB_CB(skb);
  80         struct device *dev = htc->ab->dev;
  81         struct ath12k_base *ab = htc->ab;
  82         int credits = 0;
  83         int ret;
  84
  85         if (eid >= ATH12K_HTC_EP_COUNT) {
  86                 ath12k_warn(ab, "Invalid endpoint id: %d\n", eid);
  87                 return -ENOENT;
  88         }
  89
  90         skb_push(skb, sizeof(struct ath12k_htc_hdr));
  91
  92         if (ep->tx_credit_flow_enabled) {
  93                 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
  94                 spin_lock_bh(&htc->tx_lock);
  95                 if (ep->tx_credits < credits) {
  96                         ath12k_dbg(ab, ATH12K_DBG_HTC,
  97                                    "htc insufficient credits ep %d required %d available %d\n",
  98                                    eid, credits, ep->tx_credits);
  99                         spin_unlock_bh(&htc->tx_lock);
 100                         ret = -EAGAIN;
 101                         goto err_pull;
 102                 }
 103                 ep->tx_credits -= credits;
 104                 ath12k_dbg(ab, ATH12K_DBG_HTC,
 105                            "htc ep %d consumed %d credits (total %d)\n",
 106                            eid, credits, ep->tx_credits);
 107                 spin_unlock_bh(&htc->tx_lock);
 108         }
 109
 110         ath12k_htc_prepare_tx_skb(ep, skb);
 111
 112         skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 113         ret = dma_mapping_error(dev, skb_cb->paddr);
 114         if (ret) {
 115                 ret = -EIO;
 116                 goto err_credits;
 117         }
 118
 119         ret = ath12k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid);
 120         if (ret)
 121                 goto err_unmap;
 122
 123         return 0;
 124
 125 err_unmap:
 126         dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
 127 err_credits:
 128         if (ep->tx_credit_flow_enabled) {
 129                 spin_lock_bh(&htc->tx_lock);
 130                 ep->tx_credits += credits;
 131                 ath12k_dbg(ab, ATH12K_DBG_HTC,
 132                            "htc ep %d reverted %d credits back (total %d)\n",
 133                            eid, credits, ep->tx_credits);
 134                 spin_unlock_bh(&htc->tx_lock);
 135
 136                 if (ep->ep_ops.ep_tx_credits)
 137                         ep->ep_ops.ep_tx_credits(htc->ab);
 138         }
 139 err_pull:
 140         skb_pull(skb, sizeof(struct ath12k_htc_hdr));
 141         return ret;
 142 }
 143
 144 static void
 145 ath12k_htc_process_credit_report(struct ath12k_htc *htc,
 146                                  const struct ath12k_htc_credit_report *report,
 147                                  int len,
 148                                  enum ath12k_htc_ep_id eid)
 149 {
 150         struct ath12k_base *ab = htc->ab;
 151         struct ath12k_htc_ep *ep;
 152         int i, n_reports;
 153
 154         if (len % sizeof(*report))
 155                 ath12k_warn(ab, "Uneven credit report len %d", len);
 156
 157         n_reports = len / sizeof(*report);
 158
 159         spin_lock_bh(&htc->tx_lock);
 160         for (i = 0; i < n_reports; i++, report++) {
 161                 if (report->eid >= ATH12K_HTC_EP_COUNT)
 162                         break;
 163
 164                 ep = &htc->endpoint[report->eid];
 165                 ep->tx_credits += report->credits;
 166
 167                 ath12k_dbg(ab, ATH12K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
 168                            report->eid, report->credits, ep->tx_credits);
 169
 170                 if (ep->ep_ops.ep_tx_credits) {
 171                         spin_unlock_bh(&htc->tx_lock);
 172                         ep->ep_ops.ep_tx_credits(htc->ab);
 173                         spin_lock_bh(&htc->tx_lock);
 174                 }
 175         }
 176         spin_unlock_bh(&htc->tx_lock);
 177 }
 178
 179 static int ath12k_htc_process_trailer(struct ath12k_htc *htc,
 180                                       u8 *buffer,
 181                                       int length,
 182                                       enum ath12k_htc_ep_id src_eid)
 183 {
 184         struct ath12k_base *ab = htc->ab;
 185         int status = 0;
 186         struct ath12k_htc_record *record;
 187         size_t len;
 188
 189         while (length > 0) {
 190                 record = (struct ath12k_htc_record *)buffer;
 191
 192                 if (length < sizeof(record->hdr)) {
 193                         status = -EINVAL;
 194                         break;
 195                 }
 196
 197                 if (record->hdr.len > length) {
 198                         /* no room left in buffer for record */
 199                         ath12k_warn(ab, "Invalid record length: %d\n",
 200                                     record->hdr.len);
 201                         status = -EINVAL;
 202                         break;
 203                 }
 204
 205                 switch (record->hdr.id) {
 206                 case ATH12K_HTC_RECORD_CREDITS:
 207                         len = sizeof(struct ath12k_htc_credit_report);
 208                         if (record->hdr.len < len) {
 209                                 ath12k_warn(ab, "Credit report too long\n");
 210                                 status = -EINVAL;
 211                                 break;
 212                         }
 213                         ath12k_htc_process_credit_report(htc,
 214                                                          record->credit_report,
 215                                                          record->hdr.len,
 216                                                          src_eid);
 217                         break;
 218                 default:
 219                         ath12k_warn(ab, "Unhandled record: id:%d length:%d\n",
 220                                     record->hdr.id, record->hdr.len);
 221                         break;
 222                 }
 223
 224                 if (status)
 225                         break;
 226
 227                 /* multiple records may be present in a trailer */
 228                 buffer += sizeof(record->hdr) + record->hdr.len;
 229                 length -= sizeof(record->hdr) + record->hdr.len;
 230         }
 231
 232         return status;
 233 }
 234
 235 static void ath12k_htc_suspend_complete(struct ath12k_base *ab, bool ack)
 236 {
 237         ath12k_dbg(ab, ATH12K_DBG_BOOT, "boot suspend complete %d\n", ack);
 238
 239         if (ack)
 240                 set_bit(ATH12K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
 241         else
 242                 clear_bit(ATH12K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
 243
 244         complete(&ab->htc_suspend);
 245 }
 246
 247 void ath12k_htc_rx_completion_handler(struct ath12k_base *ab,
 248                                       struct sk_buff *skb)
 249 {
 250         int status = 0;
 251         struct ath12k_htc *htc = &ab->htc;
 252         struct ath12k_htc_hdr *hdr;
 253         struct ath12k_htc_ep *ep;
 254         u16 payload_len;
 255         u32 trailer_len = 0;
 256         size_t min_len;
 257         u8 eid;
 258         bool trailer_present;
 259
 260         hdr = (struct ath12k_htc_hdr *)skb->data;
 261         skb_pull(skb, sizeof(*hdr));
 262
 263         eid = le32_get_bits(hdr->htc_info, HTC_HDR_ENDPOINTID);
 264
 265         if (eid >= ATH12K_HTC_EP_COUNT) {
 266                 ath12k_warn(ab, "HTC Rx: invalid eid %d\n", eid);
 267                 goto out;
 268         }
 269
 270         ep = &htc->endpoint[eid];
 271
 272         payload_len = le32_get_bits(hdr->htc_info, HTC_HDR_PAYLOADLEN);
 273
 274         if (payload_len + sizeof(*hdr) > ATH12K_HTC_MAX_LEN) {
 275                 ath12k_warn(ab, "HTC rx frame too long, len: %zu\n",
 276                             payload_len + sizeof(*hdr));
 277                 goto out;
 278         }
 279
 280         if (skb->len < payload_len) {
 281                 ath12k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n",
 282                             skb->len, payload_len);
 283                 goto out;
 284         }
 285
 286         /* get flags to check for trailer */
 287         trailer_present = le32_get_bits(hdr->htc_info, HTC_HDR_FLAGS) &
 288                           ATH12K_HTC_FLAG_TRAILER_PRESENT;
 289
 290         if (trailer_present) {
 291                 u8 *trailer;
 292
 293                 trailer_len = le32_get_bits(hdr->ctrl_info,
 294                                             HTC_HDR_CONTROLBYTES0);
 295                 min_len = sizeof(struct ath12k_htc_record_hdr);
 296
 297                 if ((trailer_len < min_len) ||
 298                     (trailer_len > payload_len)) {
 299                         ath12k_warn(ab, "Invalid trailer length: %d\n",
 300                                     trailer_len);
 301                         goto out;
 302                 }
 303
 304                 trailer = (u8 *)hdr;
 305                 trailer += sizeof(*hdr);
 306                 trailer += payload_len;
 307                 trailer -= trailer_len;
 308                 status = ath12k_htc_process_trailer(htc, trailer,
 309                                                     trailer_len, eid);
 310                 if (status)
 311                         goto out;
 312
 313                 skb_trim(skb, skb->len - trailer_len);
 314         }
 315
 316         if (trailer_len >= payload_len)
 317                 /* zero length packet with trailer data, just drop these */
 318                 goto out;
 319
 320         if (eid == ATH12K_HTC_EP_0) {
 321                 struct ath12k_htc_msg *msg = (struct ath12k_htc_msg *)skb->data;
 322
 323                 switch (le32_get_bits(msg->msg_svc_id, HTC_MSG_MESSAGEID)) {
 324                 case ATH12K_HTC_MSG_READY_ID:
 325                 case ATH12K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
 326                         /* handle HTC control message */
 327                         if (completion_done(&htc->ctl_resp)) {
 328                                 /* this is a fatal error, target should not be
 329                                  * sending unsolicited messages on the ep 0
 330                                  */
 331                                 ath12k_warn(ab, "HTC rx ctrl still processing\n");
 332                                 complete(&htc->ctl_resp);
 333                                 goto out;
 334                         }
 335
 336                         htc->control_resp_len =
 337                                 min_t(int, skb->len,
 338                                       ATH12K_HTC_MAX_CTRL_MSG_LEN);
 339
 340                         memcpy(htc->control_resp_buffer, skb->data,
 341                                htc->control_resp_len);
 342
 343                         complete(&htc->ctl_resp);
 344                         break;
 345                 case ATH12K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 346                         ath12k_htc_suspend_complete(ab, true);
 347                         break;
 348                 case ATH12K_HTC_MSG_NACK_SUSPEND:
 349                         ath12k_htc_suspend_complete(ab, false);
 350                         break;
 351                 case ATH12K_HTC_MSG_WAKEUP_FROM_SUSPEND_ID:
 352                         break;
 353                 default:
 354                         ath12k_warn(ab, "ignoring unsolicited htc ep0 event %u\n",
 355                                     le32_get_bits(msg->msg_svc_id, HTC_MSG_MESSAGEID));
 356                         break;
 357                 }
 358                 goto out;
 359         }
 360
 361         ath12k_dbg(ab, ATH12K_DBG_HTC, "htc rx completion ep %d skb %pK\n",
 362                    eid, skb);
 363         ep->ep_ops.ep_rx_complete(ab, skb);
 364
 365         /* poll tx completion for interrupt disabled CE's */
 366         ath12k_ce_poll_send_completed(ab, ep->ul_pipe_id);
 367
 368         /* skb is now owned by the rx completion handler */
 369         skb = NULL;
 370 out:
 371         kfree_skb(skb);
 372 }
 373
 374 static void ath12k_htc_control_rx_complete(struct ath12k_base *ab,
 375                                            struct sk_buff *skb)
 376 {
 377         /* This is unexpected. FW is not supposed to send regular rx on this
 378          * endpoint.
 379          */
 380         ath12k_warn(ab, "unexpected htc rx\n");
 381         kfree_skb(skb);
 382 }
 383
 384 static const char *htc_service_name(enum ath12k_htc_svc_id id)
 385 {
 386         switch (id) {
 387         case ATH12K_HTC_SVC_ID_RESERVED:
 388                 return "Reserved";
 389         case ATH12K_HTC_SVC_ID_RSVD_CTRL:
 390                 return "Control";
 391         case ATH12K_HTC_SVC_ID_WMI_CONTROL:
 392                 return "WMI";
 393         case ATH12K_HTC_SVC_ID_WMI_DATA_BE:
 394                 return "DATA BE";
 395         case ATH12K_HTC_SVC_ID_WMI_DATA_BK:
 396                 return "DATA BK";
 397         case ATH12K_HTC_SVC_ID_WMI_DATA_VI:
 398                 return "DATA VI";
 399         case ATH12K_HTC_SVC_ID_WMI_DATA_VO:
 400                 return "DATA VO";
 401         case ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1:
 402                 return "WMI MAC1";
 403         case ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2:
 404                 return "WMI MAC2";
 405         case ATH12K_HTC_SVC_ID_NMI_CONTROL:
 406                 return "NMI Control";
 407         case ATH12K_HTC_SVC_ID_NMI_DATA:
 408                 return "NMI Data";
 409         case ATH12K_HTC_SVC_ID_HTT_DATA_MSG:
 410                 return "HTT Data";
 411         case ATH12K_HTC_SVC_ID_TEST_RAW_STREAMS:
 412                 return "RAW";
 413         case ATH12K_HTC_SVC_ID_IPA_TX:
 414                 return "IPA TX";
 415         case ATH12K_HTC_SVC_ID_PKT_LOG:
 416                 return "PKT LOG";
 417         case ATH12K_HTC_SVC_ID_WMI_CONTROL_DIAG:
 418                 return "WMI DIAG";
 419         }
 420
 421         return "Unknown";
 422 }
 423
 424 static void ath12k_htc_reset_endpoint_states(struct ath12k_htc *htc)
 425 {
 426         struct ath12k_htc_ep *ep;
 427         int i;
 428
 429         for (i = ATH12K_HTC_EP_0; i < ATH12K_HTC_EP_COUNT; i++) {
 430                 ep = &htc->endpoint[i];
 431                 ep->service_id = ATH12K_HTC_SVC_ID_UNUSED;
 432                 ep->max_ep_message_len = 0;
 433                 ep->max_tx_queue_depth = 0;
 434                 ep->eid = i;
 435                 ep->htc = htc;
 436                 ep->tx_credit_flow_enabled = true;
 437         }
 438 }
 439
 440 static u8 ath12k_htc_get_credit_allocation(struct ath12k_htc *htc,
 441                                            u16 service_id)
 442 {
 443         struct ath12k_htc_svc_tx_credits *serv_entry;
 444         u8 i, allocation = 0;
 445
 446         serv_entry = htc->service_alloc_table;
 447
 448         for (i = 0; i < ATH12K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {
 449                 if (serv_entry[i].service_id == service_id) {
 450                         allocation = serv_entry[i].credit_allocation;
 451                         break;
 452                 }
 453         }
 454
 455         return allocation;
 456 }
 457
 458 static int ath12k_htc_setup_target_buffer_assignments(struct ath12k_htc *htc)
 459 {
 460         struct ath12k_htc_svc_tx_credits *serv_entry;
 461         static const u32 svc_id[] = {
 462                                         ATH12K_HTC_SVC_ID_WMI_CONTROL,
 463                                         ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1,
 464                                         ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2,
 465                                 };
 466         int i, credits;
 467
 468         credits = htc->total_transmit_credits;
 469         serv_entry = htc->service_alloc_table;
 470
 471         if ((htc->wmi_ep_count == 0) ||
 472             (htc->wmi_ep_count > ARRAY_SIZE(svc_id)))
 473                 return -EINVAL;
 474
 475         /* Divide credits among number of endpoints for WMI */
 476         credits = credits / htc->wmi_ep_count;
 477         for (i = 0; i < htc->wmi_ep_count; i++) {
 478                 serv_entry[i].service_id = svc_id[i];
 479                 serv_entry[i].credit_allocation = credits;
 480         }
 481
 482         return 0;
 483 }
 484
 485 int ath12k_htc_wait_target(struct ath12k_htc *htc)
 486 {
 487         int i, status = 0;
 488         struct ath12k_base *ab = htc->ab;
 489         unsigned long time_left;
 490         struct ath12k_htc_ready *ready;
 491         u16 message_id;
 492         u16 credit_count;
 493         u16 credit_size;
 494
 495         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 496                                                 ATH12K_HTC_WAIT_TIMEOUT_HZ);
 497         if (!time_left) {
 498                 ath12k_warn(ab, "failed to receive control response completion, polling..\n");
 499
 500                 for (i = 0; i < ab->hw_params->ce_count; i++)
 501                         ath12k_ce_per_engine_service(htc->ab, i);
 502
 503                 time_left =
 504                         wait_for_completion_timeout(&htc->ctl_resp,
 505                                                     ATH12K_HTC_WAIT_TIMEOUT_HZ);
 506
 507                 if (!time_left)
 508                         status = -ETIMEDOUT;
 509         }
 510
 511         if (status < 0) {
 512                 ath12k_warn(ab, "ctl_resp never came in (%d)\n", status);
 513                 return status;
 514         }
 515
 516         if (htc->control_resp_len < sizeof(*ready)) {
 517                 ath12k_warn(ab, "Invalid HTC ready msg len:%d\n",
 518                             htc->control_resp_len);
 519                 return -ECOMM;
 520         }
 521
 522         ready = (struct ath12k_htc_ready *)htc->control_resp_buffer;
 523         message_id = le32_get_bits(ready->id_credit_count, HTC_MSG_MESSAGEID);
 524         credit_count = le32_get_bits(ready->id_credit_count,
 525                                      HTC_READY_MSG_CREDITCOUNT);
 526         credit_size = le32_get_bits(ready->size_ep, HTC_READY_MSG_CREDITSIZE);
 527
 528         if (message_id != ATH12K_HTC_MSG_READY_ID) {
 529                 ath12k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id);
 530                 return -ECOMM;
 531         }
 532
 533         htc->total_transmit_credits = credit_count;
 534         htc->target_credit_size = credit_size;
 535
 536         ath12k_dbg(ab, ATH12K_DBG_HTC,
 537                    "Target ready! transmit resources: %d size:%d\n",
 538                    htc->total_transmit_credits, htc->target_credit_size);
 539
 540         if ((htc->total_transmit_credits == 0) ||
 541             (htc->target_credit_size == 0)) {
 542                 ath12k_warn(ab, "Invalid credit size received\n");
 543                 return -ECOMM;
 544         }
 545
 546         ath12k_htc_setup_target_buffer_assignments(htc);
 547
 548         return 0;
 549 }
 550
 551 int ath12k_htc_connect_service(struct ath12k_htc *htc,
 552                                struct ath12k_htc_svc_conn_req *conn_req,
 553                                struct ath12k_htc_svc_conn_resp *conn_resp)
 554 {
 555         struct ath12k_base *ab = htc->ab;
 556         struct ath12k_htc_conn_svc *req_msg;
 557         struct ath12k_htc_conn_svc_resp resp_msg_dummy;
 558         struct ath12k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy;
 559         enum ath12k_htc_ep_id assigned_eid = ATH12K_HTC_EP_COUNT;
 560         struct ath12k_htc_ep *ep;
 561         struct sk_buff *skb;
 562         unsigned int max_msg_size = 0;
 563         int length, status;
 564         unsigned long time_left;
 565         bool disable_credit_flow_ctrl = false;
 566         u16 message_id, service_id, flags = 0;
 567         u8 tx_alloc = 0;
 568
 569         /* special case for HTC pseudo control service */
 570         if (conn_req->service_id == ATH12K_HTC_SVC_ID_RSVD_CTRL) {
 571                 disable_credit_flow_ctrl = true;
 572                 assigned_eid = ATH12K_HTC_EP_0;
 573                 max_msg_size = ATH12K_HTC_MAX_CTRL_MSG_LEN;
 574                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 575                 goto setup;
 576         }
 577
 578         tx_alloc = ath12k_htc_get_credit_allocation(htc,
 579                                                     conn_req->service_id);
 580         if (!tx_alloc)
 581                 ath12k_dbg(ab, ATH12K_DBG_BOOT,
 582                            "boot htc service %s does not allocate target credits\n",
 583                            htc_service_name(conn_req->service_id));
 584
 585         skb = ath12k_htc_build_tx_ctrl_skb();
 586         if (!skb) {
 587                 ath12k_warn(ab, "Failed to allocate HTC packet\n");
 588                 return -ENOMEM;
 589         }
 590
 591         length = sizeof(*req_msg);
 592         skb_put(skb, length);
 593         memset(skb->data, 0, length);
 594
 595         req_msg = (struct ath12k_htc_conn_svc *)skb->data;
 596         req_msg->msg_svc_id = le32_encode_bits(ATH12K_HTC_MSG_CONNECT_SERVICE_ID,
 597                                                HTC_MSG_MESSAGEID);
 598
 599         flags |= u32_encode_bits(tx_alloc, ATH12K_HTC_CONN_FLAGS_RECV_ALLOC);
 600
 601         /* Only enable credit flow control for WMI ctrl service */
 602         if (!(conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL ||
 603               conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1 ||
 604               conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2)) {
 605                 flags |= ATH12K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 606                 disable_credit_flow_ctrl = true;
 607         }
 608
 609         req_msg->flags_len = le32_encode_bits(flags, HTC_SVC_MSG_CONNECTIONFLAGS);
 610         req_msg->msg_svc_id |= le32_encode_bits(conn_req->service_id,
 611                                                 HTC_SVC_MSG_SERVICE_ID);
 612
 613         reinit_completion(&htc->ctl_resp);
 614
 615         status = ath12k_htc_send(htc, ATH12K_HTC_EP_0, skb);
 616         if (status) {
 617                 kfree_skb(skb);
 618                 return status;
 619         }
 620
 621         /* wait for response */
 622         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 623                                                 ATH12K_HTC_CONN_SVC_TIMEOUT_HZ);
 624         if (!time_left) {
 625                 ath12k_err(ab, "Service connect timeout\n");
 626                 return -ETIMEDOUT;
 627         }
 628
 629         /* we controlled the buffer creation, it's aligned */
 630         resp_msg = (struct ath12k_htc_conn_svc_resp *)htc->control_resp_buffer;
 631         message_id = le32_get_bits(resp_msg->msg_svc_id, HTC_MSG_MESSAGEID);
 632         service_id = le32_get_bits(resp_msg->msg_svc_id,
 633                                    HTC_SVC_RESP_MSG_SERVICEID);
 634
 635         if ((message_id != ATH12K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 636             (htc->control_resp_len < sizeof(*resp_msg))) {
 637                 ath12k_err(ab, "Invalid resp message ID 0x%x", message_id);
 638                 return -EPROTO;
 639         }
 640
 641         ath12k_dbg(ab, ATH12K_DBG_HTC,
 642                    "HTC Service %s connect response: status: %u, assigned ep: %u\n",
 643                    htc_service_name(service_id),
 644                    le32_get_bits(resp_msg->flags_len, HTC_SVC_RESP_MSG_STATUS),
 645                    le32_get_bits(resp_msg->flags_len, HTC_SVC_RESP_MSG_ENDPOINTID));
 646
 647         conn_resp->connect_resp_code = le32_get_bits(resp_msg->flags_len,
 648                                                      HTC_SVC_RESP_MSG_STATUS);
 649
 650         /* check response status */
 651         if (conn_resp->connect_resp_code != ATH12K_HTC_CONN_SVC_STATUS_SUCCESS) {
 652                 ath12k_err(ab, "HTC Service %s connect request failed: 0x%x)\n",
 653                            htc_service_name(service_id),
 654                        conn_resp->connect_resp_code);
 655                 return -EPROTO;
 656         }
 657
 658         assigned_eid = le32_get_bits(resp_msg->flags_len,
 659                                      HTC_SVC_RESP_MSG_ENDPOINTID);
 660
 661         max_msg_size = le32_get_bits(resp_msg->flags_len,
 662                                      HTC_SVC_RESP_MSG_MAXMSGSIZE);
 663
 664 setup:
 665
 666         if (assigned_eid >= ATH12K_HTC_EP_COUNT)
 667                 return -EPROTO;
 668
 669         if (max_msg_size == 0)
 670                 return -EPROTO;
 671
 672         ep = &htc->endpoint[assigned_eid];
 673         ep->eid = assigned_eid;
 674
 675         if (ep->service_id != ATH12K_HTC_SVC_ID_UNUSED)
 676                 return -EPROTO;
 677
 678         /* return assigned endpoint to caller */
 679         conn_resp->eid = assigned_eid;
 680         conn_resp->max_msg_len = le32_get_bits(resp_msg->flags_len,
 681                                                HTC_SVC_RESP_MSG_MAXMSGSIZE);
 682
 683         /* setup the endpoint */
 684         ep->service_id = conn_req->service_id;
 685         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 686         ep->max_ep_message_len = le32_get_bits(resp_msg->flags_len,
 687                                                HTC_SVC_RESP_MSG_MAXMSGSIZE);
 688         ep->tx_credits = tx_alloc;
 689
 690         /* copy all the callbacks */
 691         ep->ep_ops = conn_req->ep_ops;
 692
 693         status = ath12k_hif_map_service_to_pipe(htc->ab,
 694                                                 ep->service_id,
 695                                                 &ep->ul_pipe_id,
 696                                                 &ep->dl_pipe_id);
 697         if (status)
 698                 return status;
 699
 700         ath12k_dbg(ab, ATH12K_DBG_BOOT,
 701                    "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 702                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 703                    ep->dl_pipe_id, ep->eid);
 704
 705         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 706                 ep->tx_credit_flow_enabled = false;
 707                 ath12k_dbg(ab, ATH12K_DBG_BOOT,
 708                            "boot htc service '%s' eid %d TX flow control disabled\n",
 709                            htc_service_name(ep->service_id), assigned_eid);
 710         }
 711
 712         return status;
 713 }
 714
 715 int ath12k_htc_start(struct ath12k_htc *htc)
 716 {
 717         struct sk_buff *skb;
 718         int status;
 719         struct ath12k_base *ab = htc->ab;
 720         struct ath12k_htc_setup_complete_extended *msg;
 721
 722         skb = ath12k_htc_build_tx_ctrl_skb();
 723         if (!skb)
 724                 return -ENOMEM;
 725
 726         skb_put(skb, sizeof(*msg));
 727         memset(skb->data, 0, skb->len);
 728
 729         msg = (struct ath12k_htc_setup_complete_extended *)skb->data;
 730         msg->msg_id = le32_encode_bits(ATH12K_HTC_MSG_SETUP_COMPLETE_EX_ID,
 731                                        HTC_MSG_MESSAGEID);
 732
 733         ath12k_dbg(ab, ATH12K_DBG_HTC, "HTC is using TX credit flow control\n");
 734
 735         status = ath12k_htc_send(htc, ATH12K_HTC_EP_0, skb);
 736         if (status) {
 737                 kfree_skb(skb);
 738                 return status;
 739         }
 740
 741         return 0;
 742 }
 743
 744 int ath12k_htc_init(struct ath12k_base *ab)
 745 {
 746         struct ath12k_htc *htc = &ab->htc;
 747         struct ath12k_htc_svc_conn_req conn_req = { };
 748         struct ath12k_htc_svc_conn_resp conn_resp = { };
 749         int ret;
 750
 751         spin_lock_init(&htc->tx_lock);
 752
 753         ath12k_htc_reset_endpoint_states(htc);
 754
 755         htc->ab = ab;
 756
 757         switch (ab->wmi_ab.preferred_hw_mode) {
 758         case WMI_HOST_HW_MODE_SINGLE:
 759                 htc->wmi_ep_count = 1;
 760                 break;
 761         case WMI_HOST_HW_MODE_DBS:
 762         case WMI_HOST_HW_MODE_DBS_OR_SBS:
 763                 htc->wmi_ep_count = 2;
 764                 break;
 765         case WMI_HOST_HW_MODE_DBS_SBS:
 766                 htc->wmi_ep_count = 3;
 767                 break;
 768         default:
 769                 htc->wmi_ep_count = ab->hw_params->max_radios;
 770                 break;
 771         }
 772
 773         /* setup our pseudo HTC control endpoint connection */
 774         conn_req.ep_ops.ep_tx_complete = ath12k_htc_control_tx_complete;
 775         conn_req.ep_ops.ep_rx_complete = ath12k_htc_control_rx_complete;
 776         conn_req.max_send_queue_depth = ATH12K_NUM_CONTROL_TX_BUFFERS;
 777         conn_req.service_id = ATH12K_HTC_SVC_ID_RSVD_CTRL;
 778
 779         /* connect fake service */
 780         ret = ath12k_htc_connect_service(htc, &conn_req, &conn_resp);
 781         if (ret) {
 782                 ath12k_err(ab, "could not connect to htc service (%d)\n", ret);
 783                 return ret;
 784         }
 785
 786         init_completion(&htc->ctl_resp);
 787
 788         return 0;
 789 }