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 } 828