drivers/net/wireless/ath/ath11k/htc.c

   1 // SPDX-License-Identifier: BSD-3-Clause-Clear
   2 /*
   3  * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2022-2023 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 *ath11k_htc_alloc_skb(struct ath11k_base *ab, int size)
  13 {
  14         struct sk_buff *skb;
  15
  16         skb = dev_alloc_skb(size + sizeof(struct ath11k_htc_hdr));
  17         if (!skb)
  18                 return NULL;
  19
  20         skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
  21
  22         /* FW/HTC requires 4-byte aligned streams */
  23         if (!IS_ALIGNED((unsigned long)skb->data, 4))
  24                 ath11k_warn(ab, "Unaligned HTC tx skb\n");
  25
  26         return skb;
  27 }
  28
  29 static void ath11k_htc_control_tx_complete(struct ath11k_base *ab,
  30                                            struct sk_buff *skb)
  31 {
  32         kfree_skb(skb);
  33 }
  34
  35 static struct sk_buff *ath11k_htc_build_tx_ctrl_skb(void *ab)
  36 {
  37         struct sk_buff *skb;
  38         struct ath11k_skb_cb *skb_cb;
  39
  40         skb = dev_alloc_skb(ATH11K_HTC_CONTROL_BUFFER_SIZE);
  41         if (!skb)
  42                 return NULL;
  43
  44         skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
  45         WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));
  46
  47         skb_cb = ATH11K_SKB_CB(skb);
  48         memset(skb_cb, 0, sizeof(*skb_cb));
  49
  50         return skb;
  51 }
  52
  53 static void ath11k_htc_prepare_tx_skb(struct ath11k_htc_ep *ep,
  54                                       struct sk_buff *skb)
  55 {
  56         struct ath11k_htc_hdr *hdr;
  57
  58         hdr = (struct ath11k_htc_hdr *)skb->data;
  59
  60         memset(hdr, 0, sizeof(*hdr));
  61         hdr->htc_info = FIELD_PREP(HTC_HDR_ENDPOINTID, ep->eid) |
  62                         FIELD_PREP(HTC_HDR_PAYLOADLEN,
  63                                    (skb->len - sizeof(*hdr)));
  64
  65         if (ep->tx_credit_flow_enabled)
  66                 hdr->htc_info |= FIELD_PREP(HTC_HDR_FLAGS,
  67                                             ATH11K_HTC_FLAG_NEED_CREDIT_UPDATE);
  68
  69         spin_lock_bh(&ep->htc->tx_lock);
  70         hdr->ctrl_info = FIELD_PREP(HTC_HDR_CONTROLBYTES1, ep->seq_no++);
  71         spin_unlock_bh(&ep->htc->tx_lock);
  72 }
  73
  74 int ath11k_htc_send(struct ath11k_htc *htc,
  75                     enum ath11k_htc_ep_id eid,
  76                     struct sk_buff *skb)
  77 {
  78         struct ath11k_htc_ep *ep = &htc->endpoint[eid];
  79         struct ath11k_skb_cb *skb_cb = ATH11K_SKB_CB(skb);
  80         struct device *dev = htc->ab->dev;
  81         struct ath11k_base *ab = htc->ab;
  82         int credits = 0;
  83         int ret;
  84         bool credit_flow_enabled = (ab->hw_params.credit_flow &&
  85                                     ep->tx_credit_flow_enabled);
  86
  87         if (eid >= ATH11K_HTC_EP_COUNT) {
  88                 ath11k_warn(ab, "Invalid endpoint id: %d\n", eid);
  89                 return -ENOENT;
  90         }
  91
  92         skb_push(skb, sizeof(struct ath11k_htc_hdr));
  93
  94         if (credit_flow_enabled) {
  95                 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
  96                 spin_lock_bh(&htc->tx_lock);
  97                 if (ep->tx_credits < credits) {
  98                         ath11k_dbg(ab, ATH11K_DBG_HTC,
  99                                    "ep %d insufficient credits required %d total %d\n",
 100                                    eid, credits, ep->tx_credits);
 101                         spin_unlock_bh(&htc->tx_lock);
 102                         ret = -EAGAIN;
 103                         goto err_pull;
 104                 }
 105                 ep->tx_credits -= credits;
 106                 ath11k_dbg(ab, ATH11K_DBG_HTC,
 107                            "ep %d credits consumed %d total %d\n",
 108                            eid, credits, ep->tx_credits);
 109                 spin_unlock_bh(&htc->tx_lock);
 110         }
 111
 112         ath11k_htc_prepare_tx_skb(ep, skb);
 113
 114         skb_cb->eid = eid;
 115         skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 116         ret = dma_mapping_error(dev, skb_cb->paddr);
 117         if (ret) {
 118                 ret = -EIO;
 119                 goto err_credits;
 120         }
 121
 122         ath11k_dbg(ab, ATH11K_DBG_HTC, "tx skb %p eid %d paddr %pad\n",
 123                    skb, skb_cb->eid, &skb_cb->paddr);
 124
 125         ret = ath11k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid);
 126         if (ret)
 127                 goto err_unmap;
 128
 129         return 0;
 130
 131 err_unmap:
 132         dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
 133 err_credits:
 134         if (credit_flow_enabled) {
 135                 spin_lock_bh(&htc->tx_lock);
 136                 ep->tx_credits += credits;
 137                 ath11k_dbg(ab, ATH11K_DBG_HTC,
 138                            "ep %d credits reverted %d total %d\n",
 139                            eid, credits, ep->tx_credits);
 140                 spin_unlock_bh(&htc->tx_lock);
 141
 142                 if (ep->ep_ops.ep_tx_credits)
 143                         ep->ep_ops.ep_tx_credits(htc->ab);
 144         }
 145 err_pull:
 146         skb_pull(skb, sizeof(struct ath11k_htc_hdr));
 147         return ret;
 148 }
 149
 150 static void
 151 ath11k_htc_process_credit_report(struct ath11k_htc *htc,
 152                                  const struct ath11k_htc_credit_report *report,
 153                                  int len,
 154                                  enum ath11k_htc_ep_id eid)
 155 {
 156         struct ath11k_base *ab = htc->ab;
 157         struct ath11k_htc_ep *ep;
 158         int i, n_reports;
 159
 160         if (len % sizeof(*report))
 161                 ath11k_warn(ab, "Uneven credit report len %d", len);
 162
 163         n_reports = len / sizeof(*report);
 164
 165         spin_lock_bh(&htc->tx_lock);
 166         for (i = 0; i < n_reports; i++, report++) {
 167                 if (report->eid >= ATH11K_HTC_EP_COUNT)
 168                         break;
 169
 170                 ep = &htc->endpoint[report->eid];
 171                 ep->tx_credits += report->credits;
 172
 173                 ath11k_dbg(ab, ATH11K_DBG_HTC, "ep %d credits got %d total %d\n",
 174                            report->eid, report->credits, ep->tx_credits);
 175
 176                 if (ep->ep_ops.ep_tx_credits) {
 177                         spin_unlock_bh(&htc->tx_lock);
 178                         ep->ep_ops.ep_tx_credits(htc->ab);
 179                         spin_lock_bh(&htc->tx_lock);
 180                 }
 181         }
 182         spin_unlock_bh(&htc->tx_lock);
 183 }
 184
 185 static int ath11k_htc_process_trailer(struct ath11k_htc *htc,
 186                                       u8 *buffer,
 187                                       int length,
 188                                       enum ath11k_htc_ep_id src_eid)
 189 {
 190         struct ath11k_base *ab = htc->ab;
 191         int status = 0;
 192         struct ath11k_htc_record *record;
 193         size_t len;
 194
 195         while (length > 0) {
 196                 record = (struct ath11k_htc_record *)buffer;
 197
 198                 if (length < sizeof(record->hdr)) {
 199                         status = -EINVAL;
 200                         break;
 201                 }
 202
 203                 if (record->hdr.len > length) {
 204                         /* no room left in buffer for record */
 205                         ath11k_warn(ab, "Invalid record length: %d\n",
 206                                     record->hdr.len);
 207                         status = -EINVAL;
 208                         break;
 209                 }
 210
 211                 if (ab->hw_params.credit_flow) {
 212                         switch (record->hdr.id) {
 213                         case ATH11K_HTC_RECORD_CREDITS:
 214                                 len = sizeof(struct ath11k_htc_credit_report);
 215                                 if (record->hdr.len < len) {
 216                                         ath11k_warn(ab, "Credit report too long\n");
 217                                         status = -EINVAL;
 218                                         break;
 219                                 }
 220                                 ath11k_htc_process_credit_report(htc,
 221                                                                  record->credit_report,
 222                                                                  record->hdr.len,
 223                                                                  src_eid);
 224                                 break;
 225                         default:
 226                                 ath11k_warn(ab, "Unhandled record: id:%d length:%d\n",
 227                                             record->hdr.id, record->hdr.len);
 228                                 break;
 229                         }
 230                 }
 231
 232                 if (status)
 233                         break;
 234
 235                 /* multiple records may be present in a trailer */
 236                 buffer += sizeof(record->hdr) + record->hdr.len;
 237                 length -= sizeof(record->hdr) + record->hdr.len;
 238         }
 239
 240         return status;
 241 }
 242
 243 static void ath11k_htc_suspend_complete(struct ath11k_base *ab, bool ack)
 244 {
 245         ath11k_dbg(ab, ATH11K_DBG_BOOT, "suspend complete %d\n", ack);
 246
 247         if (ack)
 248                 set_bit(ATH11K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
 249         else
 250                 clear_bit(ATH11K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
 251
 252         complete(&ab->htc_suspend);
 253 }
 254
 255 void ath11k_htc_tx_completion_handler(struct ath11k_base *ab,
 256                                       struct sk_buff *skb)
 257 {
 258         struct ath11k_htc *htc = &ab->htc;
 259         struct ath11k_htc_ep *ep;
 260         void (*ep_tx_complete)(struct ath11k_base *, struct sk_buff *);
 261         u8 eid;
 262
 263         eid = ATH11K_SKB_CB(skb)->eid;
 264         if (eid >= ATH11K_HTC_EP_COUNT) {
 265                 dev_kfree_skb_any(skb);
 266                 return;
 267         }
 268
 269         ep = &htc->endpoint[eid];
 270         spin_lock_bh(&htc->tx_lock);
 271         ep_tx_complete = ep->ep_ops.ep_tx_complete;
 272         spin_unlock_bh(&htc->tx_lock);
 273         if (!ep_tx_complete) {
 274                 dev_kfree_skb_any(skb);
 275                 return;
 276         }
 277         ep_tx_complete(htc->ab, skb);
 278 }
 279
 280 static void ath11k_htc_wakeup_from_suspend(struct ath11k_base *ab)
 281 {
 282         ath11k_dbg(ab, ATH11K_DBG_BOOT, "wakeup from suspend is received\n");
 283 }
 284
 285 void ath11k_htc_rx_completion_handler(struct ath11k_base *ab,
 286                                       struct sk_buff *skb)
 287 {
 288         int status = 0;
 289         struct ath11k_htc *htc = &ab->htc;
 290         struct ath11k_htc_hdr *hdr;
 291         struct ath11k_htc_ep *ep;
 292         u16 payload_len;
 293         u32 message_id, trailer_len = 0;
 294         size_t min_len;
 295         u8 eid;
 296         bool trailer_present;
 297
 298         hdr = (struct ath11k_htc_hdr *)skb->data;
 299         skb_pull(skb, sizeof(*hdr));
 300
 301         eid = FIELD_GET(HTC_HDR_ENDPOINTID, hdr->htc_info);
 302
 303         if (eid >= ATH11K_HTC_EP_COUNT) {
 304                 ath11k_warn(ab, "HTC Rx: invalid eid %d\n", eid);
 305                 goto out;
 306         }
 307
 308         ep = &htc->endpoint[eid];
 309
 310         payload_len = FIELD_GET(HTC_HDR_PAYLOADLEN, hdr->htc_info);
 311
 312         if (payload_len + sizeof(*hdr) > ATH11K_HTC_MAX_LEN) {
 313                 ath11k_warn(ab, "HTC rx frame too long, len: %zu\n",
 314                             payload_len + sizeof(*hdr));
 315                 goto out;
 316         }
 317
 318         if (skb->len < payload_len) {
 319                 ath11k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n",
 320                             skb->len, payload_len);
 321                 goto out;
 322         }
 323
 324         /* get flags to check for trailer */
 325         trailer_present = (FIELD_GET(HTC_HDR_FLAGS, hdr->htc_info)) &
 326                           ATH11K_HTC_FLAG_TRAILER_PRESENT;
 327
 328         ath11k_dbg(ab, ATH11K_DBG_HTC, "rx ep %d skb %p trailer_present %d\n",
 329                    eid, skb, trailer_present);
 330
 331         if (trailer_present) {
 332                 u8 *trailer;
 333
 334                 trailer_len = FIELD_GET(HTC_HDR_CONTROLBYTES0, hdr->ctrl_info);
 335                 min_len = sizeof(struct ath11k_htc_record_hdr);
 336
 337                 if ((trailer_len < min_len) ||
 338                     (trailer_len > payload_len)) {
 339                         ath11k_warn(ab, "Invalid trailer length: %d\n",
 340                                     trailer_len);
 341                         goto out;
 342                 }
 343
 344                 trailer = (u8 *)hdr;
 345                 trailer += sizeof(*hdr);
 346                 trailer += payload_len;
 347                 trailer -= trailer_len;
 348                 status = ath11k_htc_process_trailer(htc, trailer,
 349                                                     trailer_len, eid);
 350                 if (status)
 351                         goto out;
 352
 353                 skb_trim(skb, skb->len - trailer_len);
 354         }
 355
 356         if (trailer_len >= payload_len)
 357                 /* zero length packet with trailer data, just drop these */
 358                 goto out;
 359
 360         if (eid == ATH11K_HTC_EP_0) {
 361                 struct ath11k_htc_msg *msg = (struct ath11k_htc_msg *)skb->data;
 362
 363                 message_id = FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id);
 364
 365                 ath11k_dbg(ab, ATH11K_DBG_HTC, "rx ep %d skb %p message_id %d\n",
 366                            eid, skb, message_id);
 367
 368                 switch (message_id) {
 369                 case ATH11K_HTC_MSG_READY_ID:
 370                 case ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
 371                         /* handle HTC control message */
 372                         if (completion_done(&htc->ctl_resp)) {
 373                                 /* this is a fatal error, target should not be
 374                                  * sending unsolicited messages on the ep 0
 375                                  */
 376                                 ath11k_warn(ab, "HTC rx ctrl still processing\n");
 377                                 complete(&htc->ctl_resp);
 378                                 goto out;
 379                         }
 380
 381                         htc->control_resp_len =
 382                                 min_t(int, skb->len,
 383                                       ATH11K_HTC_MAX_CTRL_MSG_LEN);
 384
 385                         memcpy(htc->control_resp_buffer, skb->data,
 386                                htc->control_resp_len);
 387
 388                         complete(&htc->ctl_resp);
 389                         break;
 390                 case ATH11K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 391                         ath11k_htc_suspend_complete(ab, true);
 392                         break;
 393                 case ATH11K_HTC_MSG_NACK_SUSPEND:
 394                         ath11k_htc_suspend_complete(ab, false);
 395                         break;
 396                 case ATH11K_HTC_MSG_WAKEUP_FROM_SUSPEND_ID:
 397                         ath11k_htc_wakeup_from_suspend(ab);
 398                         break;
 399                 default:
 400                         ath11k_warn(ab, "ignoring unsolicited htc ep0 event %ld\n",
 401                                     FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id));
 402                         break;
 403                 }
 404                 goto out;
 405         }
 406
 407         ep->ep_ops.ep_rx_complete(ab, skb);
 408
 409         /* poll tx completion for interrupt disabled CE's */
 410         ath11k_ce_poll_send_completed(ab, ep->ul_pipe_id);
 411
 412         /* skb is now owned by the rx completion handler */
 413         skb = NULL;
 414 out:
 415         kfree_skb(skb);
 416 }
 417
 418 static void ath11k_htc_control_rx_complete(struct ath11k_base *ab,
 419                                            struct sk_buff *skb)
 420 {
 421         /* This is unexpected. FW is not supposed to send regular rx on this
 422          * endpoint.
 423          */
 424         ath11k_warn(ab, "unexpected htc rx\n");
 425         kfree_skb(skb);
 426 }
 427
 428 static const char *htc_service_name(enum ath11k_htc_svc_id id)
 429 {
 430         switch (id) {
 431         case ATH11K_HTC_SVC_ID_RESERVED:
 432                 return "Reserved";
 433         case ATH11K_HTC_SVC_ID_RSVD_CTRL:
 434                 return "Control";
 435         case ATH11K_HTC_SVC_ID_WMI_CONTROL:
 436                 return "WMI";
 437         case ATH11K_HTC_SVC_ID_WMI_DATA_BE:
 438                 return "DATA BE";
 439         case ATH11K_HTC_SVC_ID_WMI_DATA_BK:
 440                 return "DATA BK";
 441         case ATH11K_HTC_SVC_ID_WMI_DATA_VI:
 442                 return "DATA VI";
 443         case ATH11K_HTC_SVC_ID_WMI_DATA_VO:
 444                 return "DATA VO";
 445         case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1:
 446                 return "WMI MAC1";
 447         case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2:
 448                 return "WMI MAC2";
 449         case ATH11K_HTC_SVC_ID_NMI_CONTROL:
 450                 return "NMI Control";
 451         case ATH11K_HTC_SVC_ID_NMI_DATA:
 452                 return "NMI Data";
 453         case ATH11K_HTC_SVC_ID_HTT_DATA_MSG:
 454                 return "HTT Data";
 455         case ATH11K_HTC_SVC_ID_TEST_RAW_STREAMS:
 456                 return "RAW";
 457         case ATH11K_HTC_SVC_ID_IPA_TX:
 458                 return "IPA TX";
 459         case ATH11K_HTC_SVC_ID_PKT_LOG:
 460                 return "PKT LOG";
 461         }
 462
 463         return "Unknown";
 464 }
 465
 466 static void ath11k_htc_reset_endpoint_states(struct ath11k_htc *htc)
 467 {
 468         struct ath11k_htc_ep *ep;
 469         int i;
 470
 471         for (i = ATH11K_HTC_EP_0; i < ATH11K_HTC_EP_COUNT; i++) {
 472                 ep = &htc->endpoint[i];
 473                 ep->service_id = ATH11K_HTC_SVC_ID_UNUSED;
 474                 ep->max_ep_message_len = 0;
 475                 ep->max_tx_queue_depth = 0;
 476                 ep->eid = i;
 477                 ep->htc = htc;
 478                 ep->tx_credit_flow_enabled = true;
 479         }
 480 }
 481
 482 static u8 ath11k_htc_get_credit_allocation(struct ath11k_htc *htc,
 483                                            u16 service_id)
 484 {
 485         u8 i, allocation = 0;
 486
 487         for (i = 0; i < ATH11K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {
 488                 if (htc->service_alloc_table[i].service_id == service_id) {
 489                         allocation =
 490                                 htc->service_alloc_table[i].credit_allocation;
 491                 }
 492         }
 493
 494         return allocation;
 495 }
 496
 497 static int ath11k_htc_setup_target_buffer_assignments(struct ath11k_htc *htc)
 498 {
 499         struct ath11k_htc_svc_tx_credits *serv_entry;
 500         u32 svc_id[] = {
 501                 ATH11K_HTC_SVC_ID_WMI_CONTROL,
 502                 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1,
 503                 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2,
 504         };
 505         int i, credits;
 506
 507         credits =  htc->total_transmit_credits;
 508         serv_entry = htc->service_alloc_table;
 509
 510         if ((htc->wmi_ep_count == 0) ||
 511             (htc->wmi_ep_count > ARRAY_SIZE(svc_id)))
 512                 return -EINVAL;
 513
 514         /* Divide credits among number of endpoints for WMI */
 515         credits = credits / htc->wmi_ep_count;
 516         for (i = 0; i < htc->wmi_ep_count; i++) {
 517                 serv_entry[i].service_id = svc_id[i];
 518                 serv_entry[i].credit_allocation = credits;
 519         }
 520
 521         return 0;
 522 }
 523
 524 int ath11k_htc_wait_target(struct ath11k_htc *htc)
 525 {
 526         int i, status = 0;
 527         struct ath11k_base *ab = htc->ab;
 528         unsigned long time_left;
 529         struct ath11k_htc_ready *ready;
 530         u16 message_id;
 531         u16 credit_count;
 532         u16 credit_size;
 533
 534         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 535                                                 ATH11K_HTC_WAIT_TIMEOUT_HZ);
 536         if (!time_left) {
 537                 ath11k_warn(ab, "failed to receive control response completion, polling..\n");
 538
 539                 for (i = 0; i < ab->hw_params.ce_count; i++)
 540                         ath11k_ce_per_engine_service(htc->ab, i);
 541
 542                 time_left =
 543                         wait_for_completion_timeout(&htc->ctl_resp,
 544                                                     ATH11K_HTC_WAIT_TIMEOUT_HZ);
 545
 546                 if (!time_left)
 547                         status = -ETIMEDOUT;
 548         }
 549
 550         if (status < 0) {
 551                 ath11k_warn(ab, "ctl_resp never came in (%d)\n", status);
 552                 return status;
 553         }
 554
 555         if (htc->control_resp_len < sizeof(*ready)) {
 556                 ath11k_warn(ab, "Invalid HTC ready msg len:%d\n",
 557                             htc->control_resp_len);
 558                 return -ECOMM;
 559         }
 560
 561         ready = (struct ath11k_htc_ready *)htc->control_resp_buffer;
 562         message_id   = FIELD_GET(HTC_MSG_MESSAGEID, ready->id_credit_count);
 563         credit_count = FIELD_GET(HTC_READY_MSG_CREDITCOUNT,
 564                                  ready->id_credit_count);
 565         credit_size  = FIELD_GET(HTC_READY_MSG_CREDITSIZE, ready->size_ep);
 566
 567         if (message_id != ATH11K_HTC_MSG_READY_ID) {
 568                 ath11k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id);
 569                 return -ECOMM;
 570         }
 571
 572         htc->total_transmit_credits = credit_count;
 573         htc->target_credit_size = credit_size;
 574
 575         ath11k_dbg(ab, ATH11K_DBG_HTC,
 576                    "target ready total_transmit_credits %d target_credit_size %d\n",
 577                    htc->total_transmit_credits, htc->target_credit_size);
 578
 579         if ((htc->total_transmit_credits == 0) ||
 580             (htc->target_credit_size == 0)) {
 581                 ath11k_warn(ab, "Invalid credit size received\n");
 582                 return -ECOMM;
 583         }
 584
 585         /* For QCA6390, wmi endpoint uses 1 credit to avoid
 586          * back-to-back write.
 587          */
 588         if (ab->hw_params.supports_shadow_regs)
 589                 htc->total_transmit_credits = 1;
 590
 591         ath11k_htc_setup_target_buffer_assignments(htc);
 592
 593         return 0;
 594 }
 595
 596 int ath11k_htc_connect_service(struct ath11k_htc *htc,
 597                                struct ath11k_htc_svc_conn_req *conn_req,
 598                                struct ath11k_htc_svc_conn_resp *conn_resp)
 599 {
 600         struct ath11k_base *ab = htc->ab;
 601         struct ath11k_htc_conn_svc *req_msg;
 602         struct ath11k_htc_conn_svc_resp resp_msg_dummy;
 603         struct ath11k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy;
 604         enum ath11k_htc_ep_id assigned_eid = ATH11K_HTC_EP_COUNT;
 605         struct ath11k_htc_ep *ep;
 606         struct sk_buff *skb;
 607         unsigned int max_msg_size = 0;
 608         int length, status;
 609         unsigned long time_left;
 610         bool disable_credit_flow_ctrl = false;
 611         u16 message_id, service_id, flags = 0;
 612         u8 tx_alloc = 0;
 613
 614         /* special case for HTC pseudo control service */
 615         if (conn_req->service_id == ATH11K_HTC_SVC_ID_RSVD_CTRL) {
 616                 disable_credit_flow_ctrl = true;
 617                 assigned_eid = ATH11K_HTC_EP_0;
 618                 max_msg_size = ATH11K_HTC_MAX_CTRL_MSG_LEN;
 619                 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
 620                 goto setup;
 621         }
 622
 623         tx_alloc = ath11k_htc_get_credit_allocation(htc,
 624                                                     conn_req->service_id);
 625         if (!tx_alloc)
 626                 ath11k_dbg(ab, ATH11K_DBG_BOOT,
 627                            "htc service %s does not allocate target credits\n",
 628                            htc_service_name(conn_req->service_id));
 629
 630         skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
 631         if (!skb) {
 632                 ath11k_warn(ab, "Failed to allocate HTC packet\n");
 633                 return -ENOMEM;
 634         }
 635
 636         length = sizeof(*req_msg);
 637         skb_put(skb, length);
 638         memset(skb->data, 0, length);
 639
 640         req_msg = (struct ath11k_htc_conn_svc *)skb->data;
 641         req_msg->msg_svc_id = FIELD_PREP(HTC_MSG_MESSAGEID,
 642                                          ATH11K_HTC_MSG_CONNECT_SERVICE_ID);
 643
 644         flags |= FIELD_PREP(ATH11K_HTC_CONN_FLAGS_RECV_ALLOC, tx_alloc);
 645
 646         /* Only enable credit flow control for WMI ctrl service */
 647         if (!(conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL ||
 648               conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1 ||
 649               conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2)) {
 650                 flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 651                 disable_credit_flow_ctrl = true;
 652         }
 653
 654         if (!ab->hw_params.credit_flow) {
 655                 flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
 656                 disable_credit_flow_ctrl = true;
 657         }
 658
 659         req_msg->flags_len = FIELD_PREP(HTC_SVC_MSG_CONNECTIONFLAGS, flags);
 660         req_msg->msg_svc_id |= FIELD_PREP(HTC_SVC_MSG_SERVICE_ID,
 661                                           conn_req->service_id);
 662
 663         reinit_completion(&htc->ctl_resp);
 664
 665         status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
 666         if (status) {
 667                 kfree_skb(skb);
 668                 return status;
 669         }
 670
 671         /* wait for response */
 672         time_left = wait_for_completion_timeout(&htc->ctl_resp,
 673                                                 ATH11K_HTC_CONN_SVC_TIMEOUT_HZ);
 674         if (!time_left) {
 675                 ath11k_err(ab, "Service connect timeout\n");
 676                 return -ETIMEDOUT;
 677         }
 678
 679         /* we controlled the buffer creation, it's aligned */
 680         resp_msg = (struct ath11k_htc_conn_svc_resp *)htc->control_resp_buffer;
 681         message_id = FIELD_GET(HTC_MSG_MESSAGEID, resp_msg->msg_svc_id);
 682         service_id = FIELD_GET(HTC_SVC_RESP_MSG_SERVICEID,
 683                                resp_msg->msg_svc_id);
 684
 685         if ((message_id != ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
 686             (htc->control_resp_len < sizeof(*resp_msg))) {
 687                 ath11k_err(ab, "Invalid resp message ID 0x%x", message_id);
 688                 return -EPROTO;
 689         }
 690
 691         ath11k_dbg(ab, ATH11K_DBG_HTC,
 692                    "service %s connect response status 0x%lx assigned ep 0x%lx\n",
 693                    htc_service_name(service_id),
 694                    FIELD_GET(HTC_SVC_RESP_MSG_STATUS, resp_msg->flags_len),
 695                    FIELD_GET(HTC_SVC_RESP_MSG_ENDPOINTID, resp_msg->flags_len));
 696
 697         conn_resp->connect_resp_code = FIELD_GET(HTC_SVC_RESP_MSG_STATUS,
 698                                                  resp_msg->flags_len);
 699
 700         /* check response status */
 701         if (conn_resp->connect_resp_code != ATH11K_HTC_CONN_SVC_STATUS_SUCCESS) {
 702                 ath11k_err(ab, "HTC Service %s connect request failed: 0x%x)\n",
 703                            htc_service_name(service_id),
 704                        conn_resp->connect_resp_code);
 705                 return -EPROTO;
 706         }
 707
 708         assigned_eid = (enum ath11k_htc_ep_id)FIELD_GET(
 709                                                 HTC_SVC_RESP_MSG_ENDPOINTID,
 710                                                 resp_msg->flags_len);
 711
 712         max_msg_size = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
 713                                  resp_msg->flags_len);
 714
 715 setup:
 716
 717         if (assigned_eid >= ATH11K_HTC_EP_COUNT)
 718                 return -EPROTO;
 719
 720         if (max_msg_size == 0)
 721                 return -EPROTO;
 722
 723         ep = &htc->endpoint[assigned_eid];
 724         ep->eid = assigned_eid;
 725
 726         if (ep->service_id != ATH11K_HTC_SVC_ID_UNUSED)
 727                 return -EPROTO;
 728
 729         /* return assigned endpoint to caller */
 730         conn_resp->eid = assigned_eid;
 731         conn_resp->max_msg_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
 732                                            resp_msg->flags_len);
 733
 734         /* setup the endpoint */
 735         ep->service_id = conn_req->service_id;
 736         ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
 737         ep->max_ep_message_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
 738                                            resp_msg->flags_len);
 739         ep->tx_credits = tx_alloc;
 740
 741         /* copy all the callbacks */
 742         ep->ep_ops = conn_req->ep_ops;
 743
 744         status = ath11k_hif_map_service_to_pipe(htc->ab,
 745                                                 ep->service_id,
 746                                                 &ep->ul_pipe_id,
 747                                                 &ep->dl_pipe_id);
 748         if (status)
 749                 return status;
 750
 751         ath11k_dbg(ab, ATH11K_DBG_BOOT,
 752                    "htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
 753                    htc_service_name(ep->service_id), ep->ul_pipe_id,
 754                    ep->dl_pipe_id, ep->eid);
 755
 756         if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
 757                 ep->tx_credit_flow_enabled = false;
 758                 ath11k_dbg(ab, ATH11K_DBG_BOOT,
 759                            "htc service '%s' eid %d tx flow control disabled\n",
 760                            htc_service_name(ep->service_id), assigned_eid);
 761         }
 762
 763         return status;
 764 }
 765
 766 int ath11k_htc_start(struct ath11k_htc *htc)
 767 {
 768         struct sk_buff *skb;
 769         int status = 0;
 770         struct ath11k_base *ab = htc->ab;
 771         struct ath11k_htc_setup_complete_extended *msg;
 772
 773         skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
 774         if (!skb)
 775                 return -ENOMEM;
 776
 777         skb_put(skb, sizeof(*msg));
 778         memset(skb->data, 0, skb->len);
 779
 780         msg = (struct ath11k_htc_setup_complete_extended *)skb->data;
 781         msg->msg_id = FIELD_PREP(HTC_MSG_MESSAGEID,
 782                                  ATH11K_HTC_MSG_SETUP_COMPLETE_EX_ID);
 783
 784         if (ab->hw_params.credit_flow)
 785                 ath11k_dbg(ab, ATH11K_DBG_HTC, "using tx credit flow control\n");
 786         else
 787                 msg->flags |= ATH11K_GLOBAL_DISABLE_CREDIT_FLOW;
 788
 789         status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
 790         if (status) {
 791                 kfree_skb(skb);
 792                 return status;
 793         }
 794
 795         return 0;
 796 }
 797
 798 int ath11k_htc_init(struct ath11k_base *ab)
 799 {
 800         struct ath11k_htc *htc = &ab->htc;
 801         struct ath11k_htc_svc_conn_req conn_req;
 802         struct ath11k_htc_svc_conn_resp conn_resp;
 803         int ret;
 804
 805         spin_lock_init(&htc->tx_lock);
 806
 807         ath11k_htc_reset_endpoint_states(htc);
 808
 809         htc->ab = ab;
 810
 811         switch (ab->wmi_ab.preferred_hw_mode) {
 812         case WMI_HOST_HW_MODE_SINGLE:
 813                 htc->wmi_ep_count = 1;
 814                 break;
 815         case WMI_HOST_HW_MODE_DBS:
 816         case WMI_HOST_HW_MODE_DBS_OR_SBS:
 817                 htc->wmi_ep_count = 2;
 818                 break;
 819         case WMI_HOST_HW_MODE_DBS_SBS:
 820                 htc->wmi_ep_count = 3;
 821                 break;
 822         default:
 823                 htc->wmi_ep_count = ab->hw_params.max_radios;
 824                 break;
 825         }
 826
 827         /* setup our pseudo HTC control endpoint connection */
 828         memset(&conn_req, 0, sizeof(conn_req));
 829         memset(&conn_resp, 0, sizeof(conn_resp));
 830         conn_req.ep_ops.ep_tx_complete = ath11k_htc_control_tx_complete;
 831         conn_req.ep_ops.ep_rx_complete = ath11k_htc_control_rx_complete;
 832         conn_req.max_send_queue_depth = ATH11K_NUM_CONTROL_TX_BUFFERS;
 833         conn_req.service_id = ATH11K_HTC_SVC_ID_RSVD_CTRL;
 834
 835         /* connect fake service */
 836         ret = ath11k_htc_connect_service(htc, &conn_req, &conn_resp);
 837         if (ret) {
 838                 ath11k_err(ab, "could not connect to htc service (%d)\n", ret);
 839                 return ret;
 840         }
 841
 842         init_completion(&htc->ctl_resp);
 843
 844         return 0;
 845 }