1 /* 2 * Copyright (c) 2005-2011 Atheros Communications Inc. 3 * Copyright (c) 2011-2013 Qualcomm Atheros, Inc. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include "core.h" 19 #include "hif.h" 20 #include "debug.h" 21 22 /********/ 23 /* Send */ 24 /********/ 25 26 static inline void ath10k_htc_send_complete_check(struct ath10k_htc_ep *ep, 27 int force) 28 { 29 /* 30 * Check whether HIF has any prior sends that have finished, 31 * have not had the post-processing done. 32 */ 33 ath10k_hif_send_complete_check(ep->htc->ar, ep->ul_pipe_id, force); 34 } 35 36 static void ath10k_htc_control_tx_complete(struct ath10k *ar, 37 struct sk_buff *skb) 38 { 39 kfree_skb(skb); 40 } 41 42 static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar) 43 { 44 struct sk_buff *skb; 45 struct ath10k_skb_cb *skb_cb; 46 47 skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE); 48 if (!skb) 49 return NULL; 50 51 skb_reserve(skb, 20); /* FIXME: why 20 bytes? */ 52 WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb"); 53 54 skb_cb = ATH10K_SKB_CB(skb); 55 memset(skb_cb, 0, sizeof(*skb_cb)); 56 57 ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb); 58 return skb; 59 } 60 61 static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc, 62 struct sk_buff *skb) 63 { 64 struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb); 65 66 dma_unmap_single(htc->ar->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE); 67 skb_pull(skb, sizeof(struct ath10k_htc_hdr)); 68 } 69 70 static void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep, 71 struct sk_buff *skb) 72 { 73 struct ath10k *ar = ep->htc->ar; 74 75 ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__, 76 ep->eid, skb); 77 78 ath10k_htc_restore_tx_skb(ep->htc, skb); 79 80 if (!ep->ep_ops.ep_tx_complete) { 81 ath10k_warn(ar, "no tx handler for eid %d\n", ep->eid); 82 dev_kfree_skb_any(skb); 83 return; 84 } 85 86 ep->ep_ops.ep_tx_complete(ep->htc->ar, skb); 87 } 88 89 /* assumes tx_lock is held */ 90 static bool ath10k_htc_ep_need_credit_update(struct ath10k_htc_ep *ep) 91 { 92 struct ath10k *ar = ep->htc->ar; 93 94 if (!ep->tx_credit_flow_enabled) 95 return false; 96 if (ep->tx_credits >= ep->tx_credits_per_max_message) 97 return false; 98 99 ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC: endpoint %d needs credit update\n", 100 ep->eid); 101 return true; 102 } 103 104 static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep, 105 struct sk_buff *skb) 106 { 107 struct ath10k_htc_hdr *hdr; 108 109 hdr = (struct ath10k_htc_hdr *)skb->data; 110 111 hdr->eid = ep->eid; 112 hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr)); 113 hdr->flags = 0; 114 115 spin_lock_bh(&ep->htc->tx_lock); 116 hdr->seq_no = ep->seq_no++; 117 118 if (ath10k_htc_ep_need_credit_update(ep)) 119 hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE; 120 121 spin_unlock_bh(&ep->htc->tx_lock); 122 } 123 124 int ath10k_htc_send(struct ath10k_htc *htc, 125 enum ath10k_htc_ep_id eid, 126 struct sk_buff *skb) 127 { 128 struct ath10k *ar = htc->ar; 129 struct ath10k_htc_ep *ep = &htc->endpoint[eid]; 130 struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb); 131 struct ath10k_hif_sg_item sg_item; 132 struct device *dev = htc->ar->dev; 133 int credits = 0; 134 int ret; 135 136 if (htc->ar->state == ATH10K_STATE_WEDGED) 137 return -ECOMM; 138 139 if (eid >= ATH10K_HTC_EP_COUNT) { 140 ath10k_warn(ar, "Invalid endpoint id: %d\n", eid); 141 return -ENOENT; 142 } 143 144 skb_push(skb, sizeof(struct ath10k_htc_hdr)); 145 146 if (ep->tx_credit_flow_enabled) { 147 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size); 148 spin_lock_bh(&htc->tx_lock); 149 if (ep->tx_credits < credits) { 150 spin_unlock_bh(&htc->tx_lock); 151 ret = -EAGAIN; 152 goto err_pull; 153 } 154 ep->tx_credits -= credits; 155 ath10k_dbg(ar, ATH10K_DBG_HTC, 156 "htc ep %d consumed %d credits (total %d)\n", 157 eid, credits, ep->tx_credits); 158 spin_unlock_bh(&htc->tx_lock); 159 } 160 161 ath10k_htc_prepare_tx_skb(ep, skb); 162 163 skb_cb->eid = eid; 164 skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE); 165 ret = dma_mapping_error(dev, skb_cb->paddr); 166 if (ret) 167 goto err_credits; 168 169 sg_item.transfer_id = ep->eid; 170 sg_item.transfer_context = skb; 171 sg_item.vaddr = skb->data; 172 sg_item.paddr = skb_cb->paddr; 173 sg_item.len = skb->len; 174 175 ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1); 176 if (ret) 177 goto err_unmap; 178 179 return 0; 180 181 err_unmap: 182 dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE); 183 err_credits: 184 if (ep->tx_credit_flow_enabled) { 185 spin_lock_bh(&htc->tx_lock); 186 ep->tx_credits += credits; 187 ath10k_dbg(ar, ATH10K_DBG_HTC, 188 "htc ep %d reverted %d credits back (total %d)\n", 189 eid, credits, ep->tx_credits); 190 spin_unlock_bh(&htc->tx_lock); 191 192 if (ep->ep_ops.ep_tx_credits) 193 ep->ep_ops.ep_tx_credits(htc->ar); 194 } 195 err_pull: 196 skb_pull(skb, sizeof(struct ath10k_htc_hdr)); 197 return ret; 198 } 199 200 static int ath10k_htc_tx_completion_handler(struct ath10k *ar, 201 struct sk_buff *skb) 202 { 203 struct ath10k_htc *htc = &ar->htc; 204 struct ath10k_skb_cb *skb_cb; 205 struct ath10k_htc_ep *ep; 206 207 if (WARN_ON_ONCE(!skb)) 208 return 0; 209 210 skb_cb = ATH10K_SKB_CB(skb); 211 ep = &htc->endpoint[skb_cb->eid]; 212 213 ath10k_htc_notify_tx_completion(ep, skb); 214 /* the skb now belongs to the completion handler */ 215 216 return 0; 217 } 218 219 /***********/ 220 /* Receive */ 221 /***********/ 222 223 static void 224 ath10k_htc_process_credit_report(struct ath10k_htc *htc, 225 const struct ath10k_htc_credit_report *report, 226 int len, 227 enum ath10k_htc_ep_id eid) 228 { 229 struct ath10k *ar = htc->ar; 230 struct ath10k_htc_ep *ep; 231 int i, n_reports; 232 233 if (len % sizeof(*report)) 234 ath10k_warn(ar, "Uneven credit report len %d", len); 235 236 n_reports = len / sizeof(*report); 237 238 spin_lock_bh(&htc->tx_lock); 239 for (i = 0; i < n_reports; i++, report++) { 240 if (report->eid >= ATH10K_HTC_EP_COUNT) 241 break; 242 243 ep = &htc->endpoint[report->eid]; 244 ep->tx_credits += report->credits; 245 246 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc ep %d got %d credits (total %d)\n", 247 report->eid, report->credits, ep->tx_credits); 248 249 if (ep->ep_ops.ep_tx_credits) { 250 spin_unlock_bh(&htc->tx_lock); 251 ep->ep_ops.ep_tx_credits(htc->ar); 252 spin_lock_bh(&htc->tx_lock); 253 } 254 } 255 spin_unlock_bh(&htc->tx_lock); 256 } 257 258 static int ath10k_htc_process_trailer(struct ath10k_htc *htc, 259 u8 *buffer, 260 int length, 261 enum ath10k_htc_ep_id src_eid) 262 { 263 struct ath10k *ar = htc->ar; 264 int status = 0; 265 struct ath10k_htc_record *record; 266 u8 *orig_buffer; 267 int orig_length; 268 size_t len; 269 270 orig_buffer = buffer; 271 orig_length = length; 272 273 while (length > 0) { 274 record = (struct ath10k_htc_record *)buffer; 275 276 if (length < sizeof(record->hdr)) { 277 status = -EINVAL; 278 break; 279 } 280 281 if (record->hdr.len > length) { 282 /* no room left in buffer for record */ 283 ath10k_warn(ar, "Invalid record length: %d\n", 284 record->hdr.len); 285 status = -EINVAL; 286 break; 287 } 288 289 switch (record->hdr.id) { 290 case ATH10K_HTC_RECORD_CREDITS: 291 len = sizeof(struct ath10k_htc_credit_report); 292 if (record->hdr.len < len) { 293 ath10k_warn(ar, "Credit report too long\n"); 294 status = -EINVAL; 295 break; 296 } 297 ath10k_htc_process_credit_report(htc, 298 record->credit_report, 299 record->hdr.len, 300 src_eid); 301 break; 302 default: 303 ath10k_warn(ar, "Unhandled record: id:%d length:%d\n", 304 record->hdr.id, record->hdr.len); 305 break; 306 } 307 308 if (status) 309 break; 310 311 /* multiple records may be present in a trailer */ 312 buffer += sizeof(record->hdr) + record->hdr.len; 313 length -= sizeof(record->hdr) + record->hdr.len; 314 } 315 316 if (status) 317 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc rx bad trailer", "", 318 orig_buffer, orig_length); 319 320 return status; 321 } 322 323 static int ath10k_htc_rx_completion_handler(struct ath10k *ar, 324 struct sk_buff *skb) 325 { 326 int status = 0; 327 struct ath10k_htc *htc = &ar->htc; 328 struct ath10k_htc_hdr *hdr; 329 struct ath10k_htc_ep *ep; 330 u16 payload_len; 331 u32 trailer_len = 0; 332 size_t min_len; 333 u8 eid; 334 bool trailer_present; 335 336 hdr = (struct ath10k_htc_hdr *)skb->data; 337 skb_pull(skb, sizeof(*hdr)); 338 339 eid = hdr->eid; 340 341 if (eid >= ATH10K_HTC_EP_COUNT) { 342 ath10k_warn(ar, "HTC Rx: invalid eid %d\n", eid); 343 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad header", "", 344 hdr, sizeof(*hdr)); 345 status = -EINVAL; 346 goto out; 347 } 348 349 ep = &htc->endpoint[eid]; 350 351 /* 352 * If this endpoint that received a message from the target has 353 * a to-target HIF pipe whose send completions are polled rather 354 * than interrupt-driven, this is a good point to ask HIF to check 355 * whether it has any completed sends to handle. 356 */ 357 if (ep->ul_is_polled) 358 ath10k_htc_send_complete_check(ep, 1); 359 360 payload_len = __le16_to_cpu(hdr->len); 361 362 if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) { 363 ath10k_warn(ar, "HTC rx frame too long, len: %zu\n", 364 payload_len + sizeof(*hdr)); 365 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len", "", 366 hdr, sizeof(*hdr)); 367 status = -EINVAL; 368 goto out; 369 } 370 371 if (skb->len < payload_len) { 372 ath10k_dbg(ar, ATH10K_DBG_HTC, 373 "HTC Rx: insufficient length, got %d, expected %d\n", 374 skb->len, payload_len); 375 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len", 376 "", hdr, sizeof(*hdr)); 377 status = -EINVAL; 378 goto out; 379 } 380 381 /* get flags to check for trailer */ 382 trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT; 383 if (trailer_present) { 384 u8 *trailer; 385 386 trailer_len = hdr->trailer_len; 387 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr); 388 389 if ((trailer_len < min_len) || 390 (trailer_len > payload_len)) { 391 ath10k_warn(ar, "Invalid trailer length: %d\n", 392 trailer_len); 393 status = -EPROTO; 394 goto out; 395 } 396 397 trailer = (u8 *)hdr; 398 trailer += sizeof(*hdr); 399 trailer += payload_len; 400 trailer -= trailer_len; 401 status = ath10k_htc_process_trailer(htc, trailer, 402 trailer_len, hdr->eid); 403 if (status) 404 goto out; 405 406 skb_trim(skb, skb->len - trailer_len); 407 } 408 409 if (((int)payload_len - (int)trailer_len) <= 0) 410 /* zero length packet with trailer data, just drop these */ 411 goto out; 412 413 if (eid == ATH10K_HTC_EP_0) { 414 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data; 415 416 switch (__le16_to_cpu(msg->hdr.message_id)) { 417 default: 418 /* handle HTC control message */ 419 if (completion_done(&htc->ctl_resp)) { 420 /* 421 * this is a fatal error, target should not be 422 * sending unsolicited messages on the ep 0 423 */ 424 ath10k_warn(ar, "HTC rx ctrl still processing\n"); 425 status = -EINVAL; 426 complete(&htc->ctl_resp); 427 goto out; 428 } 429 430 htc->control_resp_len = 431 min_t(int, skb->len, 432 ATH10K_HTC_MAX_CTRL_MSG_LEN); 433 434 memcpy(htc->control_resp_buffer, skb->data, 435 htc->control_resp_len); 436 437 complete(&htc->ctl_resp); 438 break; 439 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE: 440 htc->htc_ops.target_send_suspend_complete(ar); 441 } 442 goto out; 443 } 444 445 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n", 446 eid, skb); 447 ep->ep_ops.ep_rx_complete(ar, skb); 448 449 /* skb is now owned by the rx completion handler */ 450 skb = NULL; 451 out: 452 kfree_skb(skb); 453 454 return status; 455 } 456 457 static void ath10k_htc_control_rx_complete(struct ath10k *ar, 458 struct sk_buff *skb) 459 { 460 /* This is unexpected. FW is not supposed to send regular rx on this 461 * endpoint. */ 462 ath10k_warn(ar, "unexpected htc rx\n"); 463 kfree_skb(skb); 464 } 465 466 /***************/ 467 /* Init/Deinit */ 468 /***************/ 469 470 static const char *htc_service_name(enum ath10k_htc_svc_id id) 471 { 472 switch (id) { 473 case ATH10K_HTC_SVC_ID_RESERVED: 474 return "Reserved"; 475 case ATH10K_HTC_SVC_ID_RSVD_CTRL: 476 return "Control"; 477 case ATH10K_HTC_SVC_ID_WMI_CONTROL: 478 return "WMI"; 479 case ATH10K_HTC_SVC_ID_WMI_DATA_BE: 480 return "DATA BE"; 481 case ATH10K_HTC_SVC_ID_WMI_DATA_BK: 482 return "DATA BK"; 483 case ATH10K_HTC_SVC_ID_WMI_DATA_VI: 484 return "DATA VI"; 485 case ATH10K_HTC_SVC_ID_WMI_DATA_VO: 486 return "DATA VO"; 487 case ATH10K_HTC_SVC_ID_NMI_CONTROL: 488 return "NMI Control"; 489 case ATH10K_HTC_SVC_ID_NMI_DATA: 490 return "NMI Data"; 491 case ATH10K_HTC_SVC_ID_HTT_DATA_MSG: 492 return "HTT Data"; 493 case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS: 494 return "RAW"; 495 } 496 497 return "Unknown"; 498 } 499 500 static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc) 501 { 502 struct ath10k_htc_ep *ep; 503 int i; 504 505 for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) { 506 ep = &htc->endpoint[i]; 507 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED; 508 ep->max_ep_message_len = 0; 509 ep->max_tx_queue_depth = 0; 510 ep->eid = i; 511 ep->htc = htc; 512 ep->tx_credit_flow_enabled = true; 513 } 514 } 515 516 static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc) 517 { 518 struct ath10k_htc_svc_tx_credits *entry; 519 520 entry = &htc->service_tx_alloc[0]; 521 522 /* 523 * for PCIE allocate all credists/HTC buffers to WMI. 524 * no buffers are used/required for data. data always 525 * remains on host. 526 */ 527 entry++; 528 entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL; 529 entry->credit_allocation = htc->total_transmit_credits; 530 } 531 532 static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc, 533 u16 service_id) 534 { 535 u8 allocation = 0; 536 int i; 537 538 for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) { 539 if (htc->service_tx_alloc[i].service_id == service_id) 540 allocation = 541 htc->service_tx_alloc[i].credit_allocation; 542 } 543 544 return allocation; 545 } 546 547 int ath10k_htc_wait_target(struct ath10k_htc *htc) 548 { 549 struct ath10k *ar = htc->ar; 550 int i, status = 0; 551 struct ath10k_htc_svc_conn_req conn_req; 552 struct ath10k_htc_svc_conn_resp conn_resp; 553 struct ath10k_htc_msg *msg; 554 u16 message_id; 555 u16 credit_count; 556 u16 credit_size; 557 558 status = wait_for_completion_timeout(&htc->ctl_resp, 559 ATH10K_HTC_WAIT_TIMEOUT_HZ); 560 if (status == 0) { 561 /* Workaround: In some cases the PCI HIF doesn't 562 * receive interrupt for the control response message 563 * even if the buffer was completed. It is suspected 564 * iomap writes unmasking PCI CE irqs aren't propagated 565 * properly in KVM PCI-passthrough sometimes. 566 */ 567 ath10k_warn(ar, "failed to receive control response completion, polling..\n"); 568 569 for (i = 0; i < CE_COUNT; i++) 570 ath10k_hif_send_complete_check(htc->ar, i, 1); 571 572 status = wait_for_completion_timeout(&htc->ctl_resp, 573 ATH10K_HTC_WAIT_TIMEOUT_HZ); 574 575 if (status == 0) 576 status = -ETIMEDOUT; 577 } 578 579 if (status < 0) { 580 ath10k_err(ar, "ctl_resp never came in (%d)\n", status); 581 return status; 582 } 583 584 if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) { 585 ath10k_err(ar, "Invalid HTC ready msg len:%d\n", 586 htc->control_resp_len); 587 return -ECOMM; 588 } 589 590 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer; 591 message_id = __le16_to_cpu(msg->hdr.message_id); 592 credit_count = __le16_to_cpu(msg->ready.credit_count); 593 credit_size = __le16_to_cpu(msg->ready.credit_size); 594 595 if (message_id != ATH10K_HTC_MSG_READY_ID) { 596 ath10k_err(ar, "Invalid HTC ready msg: 0x%x\n", message_id); 597 return -ECOMM; 598 } 599 600 htc->total_transmit_credits = credit_count; 601 htc->target_credit_size = credit_size; 602 603 ath10k_dbg(ar, ATH10K_DBG_HTC, 604 "Target ready! transmit resources: %d size:%d\n", 605 htc->total_transmit_credits, 606 htc->target_credit_size); 607 608 if ((htc->total_transmit_credits == 0) || 609 (htc->target_credit_size == 0)) { 610 ath10k_err(ar, "Invalid credit size received\n"); 611 return -ECOMM; 612 } 613 614 ath10k_htc_setup_target_buffer_assignments(htc); 615 616 /* setup our pseudo HTC control endpoint connection */ 617 memset(&conn_req, 0, sizeof(conn_req)); 618 memset(&conn_resp, 0, sizeof(conn_resp)); 619 conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete; 620 conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete; 621 conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS; 622 conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL; 623 624 /* connect fake service */ 625 status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp); 626 if (status) { 627 ath10k_err(ar, "could not connect to htc service (%d)\n", 628 status); 629 return status; 630 } 631 632 return 0; 633 } 634 635 int ath10k_htc_connect_service(struct ath10k_htc *htc, 636 struct ath10k_htc_svc_conn_req *conn_req, 637 struct ath10k_htc_svc_conn_resp *conn_resp) 638 { 639 struct ath10k *ar = htc->ar; 640 struct ath10k_htc_msg *msg; 641 struct ath10k_htc_conn_svc *req_msg; 642 struct ath10k_htc_conn_svc_response resp_msg_dummy; 643 struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy; 644 enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT; 645 struct ath10k_htc_ep *ep; 646 struct sk_buff *skb; 647 unsigned int max_msg_size = 0; 648 int length, status; 649 bool disable_credit_flow_ctrl = false; 650 u16 message_id, service_id, flags = 0; 651 u8 tx_alloc = 0; 652 653 /* special case for HTC pseudo control service */ 654 if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) { 655 disable_credit_flow_ctrl = true; 656 assigned_eid = ATH10K_HTC_EP_0; 657 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN; 658 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy)); 659 goto setup; 660 } 661 662 tx_alloc = ath10k_htc_get_credit_allocation(htc, 663 conn_req->service_id); 664 if (!tx_alloc) 665 ath10k_dbg(ar, ATH10K_DBG_BOOT, 666 "boot htc service %s does not allocate target credits\n", 667 htc_service_name(conn_req->service_id)); 668 669 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar); 670 if (!skb) { 671 ath10k_err(ar, "Failed to allocate HTC packet\n"); 672 return -ENOMEM; 673 } 674 675 length = sizeof(msg->hdr) + sizeof(msg->connect_service); 676 skb_put(skb, length); 677 memset(skb->data, 0, length); 678 679 msg = (struct ath10k_htc_msg *)skb->data; 680 msg->hdr.message_id = 681 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID); 682 683 flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC); 684 685 /* Only enable credit flow control for WMI ctrl service */ 686 if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) { 687 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL; 688 disable_credit_flow_ctrl = true; 689 } 690 691 req_msg = &msg->connect_service; 692 req_msg->flags = __cpu_to_le16(flags); 693 req_msg->service_id = __cpu_to_le16(conn_req->service_id); 694 695 reinit_completion(&htc->ctl_resp); 696 697 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb); 698 if (status) { 699 kfree_skb(skb); 700 return status; 701 } 702 703 /* wait for response */ 704 status = wait_for_completion_timeout(&htc->ctl_resp, 705 ATH10K_HTC_CONN_SVC_TIMEOUT_HZ); 706 if (status == 0) { 707 ath10k_err(ar, "Service connect timeout: %d\n", status); 708 return -ETIMEDOUT; 709 } 710 711 /* we controlled the buffer creation, it's aligned */ 712 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer; 713 resp_msg = &msg->connect_service_response; 714 message_id = __le16_to_cpu(msg->hdr.message_id); 715 service_id = __le16_to_cpu(resp_msg->service_id); 716 717 if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) || 718 (htc->control_resp_len < sizeof(msg->hdr) + 719 sizeof(msg->connect_service_response))) { 720 ath10k_err(ar, "Invalid resp message ID 0x%x", message_id); 721 return -EPROTO; 722 } 723 724 ath10k_dbg(ar, ATH10K_DBG_HTC, 725 "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n", 726 htc_service_name(service_id), 727 resp_msg->status, resp_msg->eid); 728 729 conn_resp->connect_resp_code = resp_msg->status; 730 731 /* check response status */ 732 if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) { 733 ath10k_err(ar, "HTC Service %s connect request failed: 0x%x)\n", 734 htc_service_name(service_id), 735 resp_msg->status); 736 return -EPROTO; 737 } 738 739 assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid; 740 max_msg_size = __le16_to_cpu(resp_msg->max_msg_size); 741 742 setup: 743 744 if (assigned_eid >= ATH10K_HTC_EP_COUNT) 745 return -EPROTO; 746 747 if (max_msg_size == 0) 748 return -EPROTO; 749 750 ep = &htc->endpoint[assigned_eid]; 751 ep->eid = assigned_eid; 752 753 if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED) 754 return -EPROTO; 755 756 /* return assigned endpoint to caller */ 757 conn_resp->eid = assigned_eid; 758 conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size); 759 760 /* setup the endpoint */ 761 ep->service_id = conn_req->service_id; 762 ep->max_tx_queue_depth = conn_req->max_send_queue_depth; 763 ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size); 764 ep->tx_credits = tx_alloc; 765 ep->tx_credit_size = htc->target_credit_size; 766 ep->tx_credits_per_max_message = ep->max_ep_message_len / 767 htc->target_credit_size; 768 769 if (ep->max_ep_message_len % htc->target_credit_size) 770 ep->tx_credits_per_max_message++; 771 772 /* copy all the callbacks */ 773 ep->ep_ops = conn_req->ep_ops; 774 775 status = ath10k_hif_map_service_to_pipe(htc->ar, 776 ep->service_id, 777 &ep->ul_pipe_id, 778 &ep->dl_pipe_id, 779 &ep->ul_is_polled, 780 &ep->dl_is_polled); 781 if (status) 782 return status; 783 784 ath10k_dbg(ar, ATH10K_DBG_BOOT, 785 "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n", 786 htc_service_name(ep->service_id), ep->ul_pipe_id, 787 ep->dl_pipe_id, ep->eid); 788 789 ath10k_dbg(ar, ATH10K_DBG_BOOT, 790 "boot htc ep %d ul polled %d dl polled %d\n", 791 ep->eid, ep->ul_is_polled, ep->dl_is_polled); 792 793 if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) { 794 ep->tx_credit_flow_enabled = false; 795 ath10k_dbg(ar, ATH10K_DBG_BOOT, 796 "boot htc service '%s' eid %d TX flow control disabled\n", 797 htc_service_name(ep->service_id), assigned_eid); 798 } 799 800 return status; 801 } 802 803 struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size) 804 { 805 struct sk_buff *skb; 806 807 skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr)); 808 if (!skb) 809 return NULL; 810 811 skb_reserve(skb, sizeof(struct ath10k_htc_hdr)); 812 813 /* FW/HTC requires 4-byte aligned streams */ 814 if (!IS_ALIGNED((unsigned long)skb->data, 4)) 815 ath10k_warn(ar, "Unaligned HTC tx skb\n"); 816 817 return skb; 818 } 819 820 int ath10k_htc_start(struct ath10k_htc *htc) 821 { 822 struct ath10k *ar = htc->ar; 823 struct sk_buff *skb; 824 int status = 0; 825 struct ath10k_htc_msg *msg; 826 827 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar); 828 if (!skb) 829 return -ENOMEM; 830 831 skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext)); 832 memset(skb->data, 0, skb->len); 833 834 msg = (struct ath10k_htc_msg *)skb->data; 835 msg->hdr.message_id = 836 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID); 837 838 ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC is using TX credit flow control\n"); 839 840 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb); 841 if (status) { 842 kfree_skb(skb); 843 return status; 844 } 845 846 return 0; 847 } 848 849 /* registered target arrival callback from the HIF layer */ 850 int ath10k_htc_init(struct ath10k *ar) 851 { 852 struct ath10k_hif_cb htc_callbacks; 853 struct ath10k_htc_ep *ep = NULL; 854 struct ath10k_htc *htc = &ar->htc; 855 856 spin_lock_init(&htc->tx_lock); 857 858 ath10k_htc_reset_endpoint_states(htc); 859 860 /* setup HIF layer callbacks */ 861 htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler; 862 htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler; 863 htc->ar = ar; 864 865 /* Get HIF default pipe for HTC message exchange */ 866 ep = &htc->endpoint[ATH10K_HTC_EP_0]; 867 868 ath10k_hif_set_callbacks(ar, &htc_callbacks); 869 ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id); 870 871 init_completion(&htc->ctl_resp); 872 873 return 0; 874 } 875