carlfw/src/wlan.c

   1 /*
   2  * carl9170 firmware - used by the ar9170 wireless device
   3  *
   4  * Interface to the WLAN part of the chip
   5  *
   6  * Copyright (c) 2000-2005 ZyDAS Technology Corporation
   7  * Copyright (c) 2007-2009 Atheros Communications, Inc.
   8  * Copyright    2009    Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2009, 2010 Christian Lamparter <chunkeey@googlemail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "carl9170.h"
  27 #include "shared/phy.h"
  28 #include "hostif.h"
  29 #include "timer.h"
  30 #include "wl.h"
  31 #include "printf.h"
  32 #include "rf.h"
  33 #include "linux/ieee80211.h"
  34 #include "rom.h"
  35
  36 static void wlan_txunstuck(unsigned int queue)
  37 {
  38         set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1);
  39 }
  40
  41 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
  42 static void wlan_txupdate(unsigned int queue)
  43 {
  44         set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head));
  45 }
  46
  47 static void wlan_dma_bump(unsigned int qidx)
  48 {
  49         unsigned int offset = qidx;
  50         uint32_t status, trigger;
  51
  52         status = get(AR9170_MAC_REG_DMA_STATUS) >> 12;
  53         trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12;
  54
  55         while (offset != 0) {
  56                 status >>= 4;
  57                 trigger >>= 4;
  58                 offset--;
  59         }
  60
  61         status &= 0xf;
  62         trigger &= 0xf;
  63
  64         if ((trigger == 0xa) && (status == 0x8)) {
  65                 DBG("UNSTUCK");
  66                 wlan_txunstuck(qidx);
  67         } else {
  68                 DBG("UPDATE");
  69                 wlan_txupdate(qidx);
  70         }
  71 }
  72 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
  73
  74 #ifdef CONFIG_CARL9170FW_DEBUG
  75 static void wlan_dump_queue(unsigned int qidx)
  76 {
  77
  78         struct dma_desc *desc;
  79         struct carl9170_tx_superframe *super;
  80         int entries = 0;
  81
  82         __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
  83                 super = get_super(desc);
  84                 DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
  85                     desc->status, desc->ctrl, desc->totalLen,
  86                     desc->dataSize, desc->nextAddr, desc->lastAddr);
  87
  88                 DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
  89                     super->s.cookie, super->s.cnt, super->s.rix,
  90                     super->f.hdr.length, super->f.hdr.mac.set,
  91                     (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
  92                     super->f.data.i3e.frame_control);
  93
  94                 entries++;
  95         }
  96
  97         desc = get_wlan_txq_addr(qidx);
  98
  99         DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
 100             qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
 101             fw.wlan.tx_queue[qidx].head,
 102             desc, fw.wlan.tx_queue[qidx].terminator);
 103
 104         DBG("HW: t:%x s:%x ac:%x c:%x",
 105             (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
 106             (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
 107             (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
 108             (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
 109 }
 110 #endif /* CONFIG_CARL9170FW_DEBUG */
 111
 112 static void wlan_send_buffered_tx_status(void)
 113 {
 114         unsigned int len;
 115
 116         while (fw.wlan.tx_status_pending) {
 117                 len = min((unsigned int)fw.wlan.tx_status_pending,
 118                           CARL9170_RSP_TX_STATUS_NUM);
 119                 len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx);
 120
 121                 /*
 122                  * rather than memcpy each individual request into a large buffer,
 123                  * we _splice_ them all together.
 124                  *
 125                  * The only downside is however that we have to be careful around
 126                  * the edges of the tx_status_cache.
 127                  *
 128                  * Note:
 129                  * Each tx_status is about 2 bytes. However every command package
 130                  * must have a size which is a multiple of 4.
 131                  */
 132
 133                 send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3,
 134                                  CARL9170_RSP_TXCOMP, len, (void *)
 135                                  &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]);
 136
 137                 fw.wlan.tx_status_pending -= len;
 138                 fw.wlan.tx_status_head_idx += len;
 139                 fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM;
 140         }
 141 }
 142
 143 static struct carl9170_tx_status *wlan_get_tx_status_buffer(void)
 144 {
 145         struct carl9170_tx_status *tmp;
 146
 147         tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++];
 148         fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM;
 149
 150         if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM)
 151                 wlan_send_buffered_tx_status();
 152
 153         fw.wlan.tx_status_pending++;
 154
 155         return tmp;
 156 }
 157
 158 /* generate _aggregated_ tx_status for the host */
 159 static void wlan_tx_complete(struct carl9170_tx_superframe *super,
 160                              bool txs)
 161 {
 162         struct carl9170_tx_status *status;
 163
 164         status = wlan_get_tx_status_buffer();
 165
 166         /*
 167          * The *unique* cookie and AC_ID is used by the driver for
 168          * frame lookup.
 169          */
 170         status->cookie = super->s.cookie;
 171         status->queue = super->s.queue;
 172
 173         /*
 174          * This field holds the number of tries of the rate in
 175          * the rate index field (rix).
 176          */
 177         status->rix = super->s.rix;
 178         status->tries = super->s.cnt;
 179         status->success = (txs) ? 1 : 0;
 180 }
 181
 182 static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
 183 {
 184         /* check if this was the last possible retry with this rate */
 185         if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) {
 186                 /* end of the road - indicate tx failure */
 187                 if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
 188                         return false;
 189
 190                 /* check if there are alternative rates available */
 191                 if (!super->s.rr[super->s.rix].set)
 192                         return false;
 193
 194                 /* try next retry rate */
 195                 super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
 196
 197                 /* finally - mark the old rate as USED */
 198                 super->s.rix++;
 199
 200                 /* update MAC flags */
 201                 super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot;
 202                 super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu;
 203
 204                 /* reinitialize try counter */
 205                 super->s.cnt = 1;
 206         } else {
 207                 /* just increase retry counter */
 208                 super->s.cnt++;
 209         }
 210
 211         return true;
 212 }
 213
 214 static inline u16 get_tid(struct ieee80211_hdr *hdr)
 215 {
 216         return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
 217 }
 218
 219 /* This function will only work on uint32_t-aligned pointers! */
 220 static inline bool compare_ether_address(const void *_d0, const void *_d1)
 221 {
 222         const uint32_t *d0 = _d0;
 223         const uint32_t *d1 = _d1;
 224
 225         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 226         return !((d0[0] ^ d1[0]) | (unsigned short)(d0[1] ^ d1[1]));
 227 }
 228
 229 #ifdef CONFIG_CARL9170FW_TX_AMPDU
 230 static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
 231 {
 232         unsigned int qidx = super->s.queue;
 233         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 234
 235         if (!super->f.hdr.mac.ampdu) {
 236                 fw.wlan.ampdu_prev[qidx] = NULL;
 237
 238                 if (ht_prev)
 239                         ht_prev->f.hdr.mac.ba_end = 1;
 240         } else {
 241                 fw.wlan.ampdu_prev[qidx] = super;
 242
 243                 if (ht_prev && (get_tid(&super->f.data.i3e) != get_tid(&ht_prev->f.data.i3e) ||
 244                     !compare_ether_address(super->f.data.i3e.addr1, ht_prev->f.data.i3e.addr1)))
 245                         ht_prev->f.hdr.mac.ba_end = 1;
 246                 else
 247                         super->f.hdr.mac.ba_end = 0;
 248         }
 249 }
 250 #endif /* CONFIG_CARL9170FW_TX_AMPDU */
 251
 252 /* for all tries */
 253 static void __wlan_tx(struct dma_desc *desc)
 254 {
 255         struct carl9170_tx_superframe *super = get_super(desc);
 256
 257         if (unlikely(super->s.fill_in_tsf)) {
 258                 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
 259                 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
 260
 261                 /*
 262                  * Truth be told: this is a hack.
 263                  *
 264                  * The *real* TSF is definitely going to be higher/older.
 265                  * But this hardware emulation code is head and shoulders
 266                  * above anything a driver can possibly do.
 267                  *
 268                  * (even, if it's got an accurate atomic clock source).
 269                  */
 270
 271                 read_tsf(tsf);
 272         }
 273
 274 #ifdef CONFIG_CARL9170FW_TX_AMPDU
 275         wlan_tx_ampdu(super);
 276 #endif /* CONFIG_CARL9170FW_TX_AMPDU */
 277
 278 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
 279         wlan_tx_complete(super, true);
 280         unhide_super(desc);
 281 # ifdef CONFIG_CARL9170FW_LOOPBACK
 282         dma_put(&fw.pta.up_queue, desc);
 283         up_trigger();
 284 # elif CONFIG_CARL9170FW_DISCARD
 285         dma_reclaim(&fw.pta.down_queue, desc);
 286         down_trigger();
 287 # endif
 288 #else /* CONFIG_CARL9170FW_LOOPBACK */
 289
 290 # if ((defined CONFIG_CARL9170FW_DEBUG) && (defined CONFIG_CARL9170FW_PSM))
 291         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 292 # endif /* CONFIG_CARL9170FW_DEBUG && CONFIG_CARL9170FW_PSM */
 293
 294         /* insert desc into the right queue */
 295         dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
 296 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 297 }
 298
 299 /* prepares frame for the first transmission */
 300 static void _wlan_tx(struct dma_desc *desc)
 301 {
 302         struct carl9170_tx_superframe *super = get_super(desc);
 303
 304         if (unlikely(super->s.ampdu_commit_density)) {
 305                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 306                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 307                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 308                             super->s.ampdu_density));
 309         }
 310
 311         if (unlikely(super->s.ampdu_commit_factor)) {
 312                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 313                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 314                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 315                             8 << super->s.ampdu_factor));
 316         }
 317
 318         __wlan_tx(desc);
 319 }
 320
 321 /* propagate transmission status back to the driver */
 322 static bool wlan_tx_status(struct dma_queue *queue,
 323                            struct dma_desc *desc)
 324 {
 325         struct ar9170_tx_frame *frame = DESC_PAYLOAD(desc);
 326         struct carl9170_tx_superframe *super = get_super(desc);
 327         struct ieee80211_hdr *hdr = &super->f.data.i3e;
 328         unsigned int qidx = super->s.queue;
 329         bool txfail, success;
 330
 331         success = true;
 332
 333         /* update hangcheck */
 334         fw.wlan.last_tx_desc_num[qidx] = 0;
 335
 336         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 337                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 338
 339                 /* reset retry indicator flags */
 340                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 341
 342                 if (wlan_tx_consume_retry(super)) {
 343                         /*
 344                          * retry for simple and aggregated 802.11 frames.
 345                          *
 346                          * Note: We must not mess up the original frame
 347                          * order.
 348                          */
 349
 350                         if (!frame->hdr.mac.ampdu) {
 351                                 /*
 352                                  * 802.11 - 7.1.3.1.5.
 353                                  * set "Retry Field" for consecutive attempts
 354                                  *
 355                                  * Note: For AMPDU see:
 356                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 357                                  */
 358
 359                                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
 360                         }
 361
 362                         if (txfail) {
 363                                 /* Normal TX Failure */
 364
 365                                 /* demise descriptor ownership back to the hardware */
 366                                 dma_rearm(desc);
 367
 368                                 /*
 369                                  * And this will get the queue going again.
 370                                  * To understand why: you have to get the HW
 371                                  * specs... But sadly I never saw them.
 372                                  */
 373                                 wlan_txunstuck(qidx);
 374
 375                                 /* abort cycle - this is necessary due to HW design */
 376                                 return false;
 377                         } else {
 378                                 /* (HT-) BlockACK failure */
 379
 380                                 /*
 381                                  * Unlink the failed attempt and put it into
 382                                  * the retry queue. The caller routine must
 383                                  * be aware of this so the frames don't get lost.
 384                                  */
 385
 386                                 dma_unlink_head(queue);
 387 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 388                                 dma_put(&fw.wlan.tx_retry, desc);
 389 #else
 390                                 __wlan_tx(desc);
 391 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 392                                 return true;
 393                         }
 394                 } else {
 395                         /* out of frame attempts - discard frame */
 396                         success = false;
 397                 }
 398         }
 399
 400         dma_unlink_head(queue);
 401         if (txfail) {
 402                 /*
 403                  * Issue the queue bump,
 404                  * We need to do this in case this was the frame's last
 405                  * possible retry attempt and it unfortunately: it failed.
 406                  */
 407
 408                 wlan_txunstuck(qidx);
 409         }
 410
 411         unhide_super(desc);
 412
 413 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 414         if (unlikely(super == (void *) &dma_mem.reserved.ba)) {
 415                 fw.wlan.ba_desc = desc;
 416                 fw.wlan.ba_desc_available = 1;
 417                 return true;
 418         }
 419 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 420
 421         wlan_tx_complete(super, success);
 422
 423 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 424         if (unlikely(super->s.cab))
 425                 fw.wlan.cab_queue_len[super->s.vif_id]--;
 426 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 427
 428         /* recycle freed descriptors */
 429         dma_reclaim(&fw.pta.down_queue, desc);
 430         down_trigger();
 431         return true;
 432 }
 433
 434 static void handle_tx_completion(void)
 435 {
 436         struct dma_desc *desc;
 437         unsigned int i;
 438
 439         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
 440                 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
 441                         if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
 442                                 /* termination requested. */
 443                                 break;
 444                         }
 445                 }
 446
 447 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 448                 for_each_desc(desc, &fw.wlan.tx_retry)
 449                         __wlan_tx(desc);
 450
 451                 for_each_desc(desc, &fw.wlan.tx_delay[i])
 452                         _wlan_tx(desc);
 453 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 454                 wlan_trigger(BIT(i));
 455         }
 456 }
 457
 458 void __hot wlan_tx(struct dma_desc *desc)
 459 {
 460         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 461
 462         /* initialize rate control struct */
 463         super->s.rix = 0;
 464         super->s.cnt = 1;
 465         hide_super(desc);
 466
 467 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 468         if (unlikely(super->s.cab)) {
 469                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 470                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 471                 return;
 472         }
 473 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 474
 475 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 476         if (!queue_empty(&fw.wlan.tx_queue[super->s.queue])) {
 477                 dma_put(&fw.wlan.tx_delay[super->s.queue], desc);
 478                 return;
 479         }
 480 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 481
 482         _wlan_tx(desc);
 483         wlan_trigger(BIT(super->s.queue));
 484 }
 485
 486 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 487 static void wlan_send_buffered_ba(void)
 488 {
 489         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 490         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 491         struct carl9170_bar_ctx *ctx;
 492
 493         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 494                 return;
 495
 496         /* there's no point to continue when the ba_desc is not available. */
 497         if (!fw.wlan.ba_desc_available)
 498                 return;
 499
 500         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 501         fw.wlan.ba_head_idx++;
 502
 503         /* Format BlockAck */
 504         fw.wlan.ba_desc->status = 0;
 505         fw.wlan.ba_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 506         fw.wlan.ba_desc_available = 0;
 507         fw.wlan.ba_desc->nextAddr = fw.wlan.ba_desc->lastAddr =
 508                 fw.wlan.ba_desc;
 509
 510         baf->s.len = fw.wlan.ba_desc->totalLen = fw.wlan.ba_desc->dataSize =
 511                 sizeof(struct carl9170_tx_superdesc) +
 512                 sizeof(struct ar9170_tx_hwdesc) +
 513                 sizeof(struct ieee80211_ba);
 514
 515         baf->s.ri[0].tries = 3;
 516         baf->s.queue = 0;
 517         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 518
 519         /* HW Duration / Backoff */
 520         baf->f.hdr.mac.backoff = 1;
 521         baf->f.hdr.mac.hw_duration = 1;
 522
 523         /* take the TX rate from the RX'd BAR */
 524         baf->f.hdr.phy.set = ctx->phy;
 525         baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 526
 527         /* format outgoing BA */
 528         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
 529         ba->duration = cpu_to_le16(0);
 530         memcpy(ba->ta, ctx->ta, 6);
 531         memcpy(ba->ra, ctx->ra, 6);
 532
 533         /*
 534          * Unfortunately, we cannot look into the hardware's scoreboard.
 535          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 536          * and send a null BlockAck.
 537          */
 538         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 539
 540         /*
 541          * NB:
 542          * not entirely sure if this is 100% correct?!
 543          */
 544         ba->control = ctx->control | cpu_to_le16(1);
 545         ba->start_seq_num = ctx->start_seq_num;
 546
 547         wlan_tx(fw.wlan.ba_desc);
 548 }
 549
 550 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 551 {
 552         struct carl9170_bar_ctx *tmp;
 553
 554         /* expire oldest entry, if we ran out of ba_ctx' */
 555         if (fw.wlan.ba_head_idx + CONFIG_CARL9170FW_BACK_REQS_NUM < fw.wlan.ba_tail_idx)
 556                 fw.wlan.ba_head_idx++;
 557
 558         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 559         fw.wlan.ba_tail_idx++;
 560
 561         return tmp;
 562 }
 563
 564 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 565                        unsigned int len, unsigned int mac_err)
 566 {
 567         struct ieee80211_bar *bar;
 568         struct carl9170_bar_ctx *ctx;
 569
 570         if (unlikely(mac_err)) {
 571                 /*
 572                  * This check does a number of things:
 573                  * 1. checks if the frame is in good nick
 574                  * 2. checks if the RA (MAC) matches
 575                  */
 576                 return ;
 577         }
 578
 579         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 580                 /*
 581                  * Sneaky, corrupted BARs... but not with us!
 582                  */
 583
 584                 return ;
 585         }
 586
 587         bar = (void *) hdr;
 588
 589         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 590             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 591                 /* not implemented yet */
 592
 593                 return ;
 594         }
 595
 596         ctx = wlan_get_bar_cache_buffer();
 597
 598         /* Brilliant! The BAR provides all necessary MACs! */
 599         memcpy(ctx->ra, bar->ta, 6);
 600         memcpy(ctx->ta, bar->ra, 6);
 601
 602         /*
 603          * NB:
 604          * not entirely sure if this is 100% correct to force the
 605          * imm ack bit or not...
 606          */
 607         ctx->control = bar->control | cpu_to_le16(1);
 608         ctx->start_seq_num = bar->start_seq_num;
 609         ctx->phy = ar9170_rx_to_phy(desc);
 610         if (unlikely(!ctx->phy)) {
 611                 /* provide a backup, in case ar9170_rx_to_phy fails */
 612                 ctx->phy = cpu_to_le32(0x2cc301);
 613         }
 614 }
 615 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 616
 617 static void wlan_check_rx_overrun(void)
 618 {
 619         uint32_t overruns, total;
 620
 621         fw.wlan.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 622         fw.wlan.rx_overruns += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 623         if (unlikely(overruns)) {
 624                 if (overruns == total) {
 625                         DBG("RX Overrun");
 626                         fw.wlan.mac_reset++;
 627                 }
 628
 629                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 630         }
 631 }
 632
 633 #ifdef CONFIG_CARL9170FW_WOL
 634 static void wlan_rx_wol(struct ieee80211_hdr *hdr, unsigned int len)
 635 {
 636         const unsigned char *data, *end, *mac;
 637         unsigned int found = 0;
 638
 639         /*
 640          * LIMITATION:
 641          * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
 642          * for MAGIC patterns!
 643          */
 644
 645         /*
 646          * TODO:
 647          * Currently, the MAGIC MAC Address is fixed to the EEPROM default.
 648          * It's possible to make it fully configurable, e.g:
 649          *
 650          * mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
 651          * But this will clash with the driver's suspend path, because it
 652          * needs to reset the registers.
 653          */
 654         mac = rom.sys.mac_address;
 655
 656         data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
 657         end = (u8 *)((unsigned long)hdr + len);
 658
 659         /*
 660          * scan for standard WOL Magic frame
 661          *
 662          * "A physical WakeOnLAN (Magic Packet) will look like this:
 663          * ---------------------------------------------------------------
 664          * | Synchronization Stream |  Target MAC |  Password (optional) |
 665          * |    6 octets            |   96 octets |   0, 4 or 6          |
 666          * ---------------------------------------------------------------
 667          *
 668          * The Synchronization Stream is defined as 6 bytes of FFh.
 669          * The Target MAC block contains 16 duplications of the IEEEaddress
 670          * of the target, with no breaks or interruptions.
 671          *
 672          * The Password field is optional, but if present, contains either
 673          * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
 674          * dissect the password, if present, according to the command-line
 675          * format that ether-wake uses, therefore, if a 4-byte password is
 676          * present, it will be dissected as an IPv4 address and if a 6-byte
 677          * password is present, it will be dissected as an Ethernet address.
 678          *
 679          * <http://wiki.wireshark.org/WakeOnLAN>
 680          */
 681
 682         while (data < end) {
 683                 if (found >= 6) {
 684                         if (*data == mac[found % 6])
 685                                 found++;
 686                         else
 687                                 found = 0;
 688                 }
 689
 690                 /* previous check might reset found counter */
 691                 if (found < 6) {
 692                         if (*data == 0xff)
 693                                 found++;
 694                         else
 695                                 found = 0;
 696                 }
 697
 698                 if (found == (6 + 16 * 6)) {
 699                         fw.suspend_mode = CARL9170_AWAKE_HOST;
 700                         return;
 701                 }
 702
 703                 data++;
 704         }
 705
 706         return;
 707 }
 708 #endif /* CONFIG_CARL9170FW_WOL */
 709
 710 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 711 {
 712         struct ieee80211_hdr *hdr;
 713         unsigned int data_len;
 714         unsigned int rx_filter;
 715         unsigned int mac_err;
 716
 717         data_len = ar9170_get_rx_mpdu_len(desc);
 718         mac_err = ar9170_get_rx_macstatus_error(desc);
 719
 720 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 721
 722         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 723             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 724             mac_err & AR9170_RX_ERROR_BAD) {
 725                 /*
 726                  * This frame is too damaged to do anything
 727                  * useful with it.
 728                  */
 729
 730                 return CARL9170_RX_FILTER_BAD;
 731         }
 732
 733         rx_filter = 0;
 734         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 735                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 736
 737         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 738                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 739
 740         hdr = ar9170_get_rx_i3e(desc);
 741         if (likely(ieee80211_is_data(hdr->frame_control))) {
 742                 rx_filter |= CARL9170_RX_FILTER_DATA;
 743         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 744                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 745                 case IEEE80211_STYPE_BACK_REQ:
 746 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 747                         handle_bar(desc, hdr, data_len, mac_err);
 748 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 749                         /* fallthrough */
 750                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 751                         break;
 752                 case IEEE80211_STYPE_PSPOLL:
 753                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 754                         break;
 755                 default:
 756                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 757                         break;
 758                 }
 759         } else {
 760                 /* ieee80211_is_mgmt */
 761                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 762         }
 763
 764 #ifdef CONFIG_CARL9170FW_WOL
 765         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 766                 if (rx_filter & CARL9170_RX_FILTER_DATA)
 767                         wlan_rx_wol(hdr, min(data_len,
 768                                     (unsigned int)AR9170_BLOCK_SIZE));
 769         }
 770 #endif /* CONFIG_CARL9170FW_WOL */
 771
 772 #undef AR9170_RX_ERROR_BAD
 773
 774         return rx_filter;
 775 }
 776
 777 static void handle_rx(void)
 778 {
 779         struct dma_desc *desc;
 780
 781         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 782                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 783                         dma_put(&fw.pta.up_queue, desc);
 784                         up_trigger();
 785                 } else {
 786                         dma_reclaim(&fw.wlan.rx_queue, desc);
 787                         _wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 788                 }
 789         }
 790 }
 791
 792 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 793 void wlan_cab_flush_queue(const unsigned int vif)
 794 {
 795         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 796         struct dma_desc *desc;
 797
 798         /* move queued frames into the main tx queues */
 799         for_each_desc(desc, cab_queue) {
 800                 struct carl9170_tx_superframe *super = get_super(desc);
 801                 if (!queue_empty(cab_queue)) {
 802                         /*
 803                          * Set MOREDATA flag for all,
 804                          * but the last queued frame.
 805                          * see: 802.11-2007 11.2.1.5 f)
 806                          *
 807                          * This is actually the reason to why
 808                          * we need to prevent the reentry.
 809                          */
 810
 811                         super->f.data.i3e.frame_control |=
 812                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 813                 } else {
 814                         super->f.data.i3e.frame_control &=
 815                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 816                 }
 817
 818                 /* ready to roll! */
 819                 _wlan_tx(desc);
 820                 wlan_trigger(BIT(super->s.queue));
 821         }
 822 }
 823
 824 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 825                                const unsigned int len)
 826 {
 827         struct ieee80211_mgmt *mgmt = addr;
 828         uint8_t *pos, *end;
 829
 830         pos = mgmt->u.beacon.variable;
 831         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 832         while (pos < end) {
 833                 if (pos + 2 + pos[1] > end)
 834                         return NULL;
 835
 836                 if (pos[0] == ie)
 837                         return pos;
 838
 839                 pos += pos[1] + 2;
 840         }
 841
 842         return NULL;
 843 }
 844
 845 void wlan_cab_modify_dtim_beacon(const unsigned int vif,
 846         const unsigned int addr, const unsigned int len)
 847 {
 848         uint8_t *_ie;
 849         struct ieee80211_tim_ie *ie;
 850
 851         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 852         if (likely(_ie)) {
 853                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 854
 855                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 856                         /* schedule DTIM transfer */
 857                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 858                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 859                         /* undo all chances to the beacon structure */
 860                         ie->bitmap_ctrl &= ~0x1;
 861                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 862                 }
 863
 864                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 865                 if (fw.wlan.cab_flush_trigger[vif]) {
 866                         /* Set the almighty Multicast Traffic Indication Bit. */
 867                         ie->bitmap_ctrl |= 0x1;
 868                 }
 869         }
 870 }
 871 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 872
 873 static void handle_beacon_config(void)
 874 {
 875         uint32_t bcn_count;
 876
 877         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 878         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 879                          (uint8_t *) &bcn_count);
 880
 881         set(AR9170_MAC_REG_BCN_CTRL, AR9170_BCN_CTRL_READY);
 882 }
 883
 884 static void handle_pretbtt(void)
 885 {
 886 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 887         fw.wlan.cab_flush_time = get_clock_counter();
 888 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 889
 890 #ifdef CONFIG_CARL9170FW_PSM
 891         rf_psm();
 892
 893         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 894                          (uint8_t *) &fw.phy.psm.state);
 895 #else
 896         send_cmd_to_host(0, CARL9170_RSP_PRETBTT, 0x00, NULL);
 897 #endif /* CONFIG_CARL9170FW_PSM */
 898 }
 899
 900 static void handle_atim(void)
 901 {
 902         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 903 }
 904
 905 #ifdef CONFIG_CARL9170FW_DEBUG
 906 static void handle_qos(void)
 907 {
 908         /*
 909          * What is the QoS Bit used for?
 910          * Is it only an indicator for TXOP & Burst, or
 911          * should we do something here?
 912          */
 913 }
 914
 915 static void handle_radar(void)
 916 {
 917         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
 918 }
 919 #endif /* CONFIG_CARL9170FW_DEBUG */
 920
 921 static void wlan_janitor(void)
 922 {
 923 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 924         unsigned int i;
 925
 926         for (i = 0; i < CARL9170_INTF_NUM; i++) {
 927                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
 928                         /*
 929                          * This is hardcoded into carl9170usb driver.
 930                          *
 931                          * The driver must set the PRETBTT event to beacon_interval -
 932                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
 933                          *
 934                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
 935                          * 11.2.1.6. Let's hope the current solution is adequate enough.
 936                          */
 937
 938                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
 939                                 wlan_cab_flush_queue(i);
 940
 941                                 /*
 942                                  * This prevents the code from sending new BC/MC frames
 943                                  * which were queued after the previous buffered traffic
 944                                  * has been sent out... They will have to wait until the
 945                                  * next DTIM beacon comes along.
 946                                  */
 947                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
 948                         }
 949                 }
 950
 951         }
 952 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 953
 954 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 955         if (fw.wlan.tx_trigger) {
 956                 _wlan_trigger(fw.wlan.tx_trigger);
 957                 fw.wlan.tx_trigger = 0;
 958         }
 959 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 960
 961         wlan_send_buffered_tx_status();
 962
 963 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 964         wlan_send_buffered_ba();
 965 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 966 }
 967
 968 void handle_wlan(void)
 969 {
 970         uint32_t intr;
 971
 972         intr = get(AR9170_MAC_REG_INT_CTRL);
 973         /* ACK Interrupt */
 974         set(AR9170_MAC_REG_INT_CTRL, intr);
 975
 976 #define HANDLER(intr, flag, func)                       \
 977         do {                                            \
 978                 if ((intr & flag) != 0) {               \
 979                         func();                         \
 980                 }                                       \
 981         } while (0)
 982
 983         intr |= fw.wlan.soft_int;
 984         fw.wlan.soft_int = 0;
 985
 986         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
 987
 988         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
 989
 990         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
 991
 992         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
 993                 handle_tx_completion);
 994
 995 #ifdef CONFIG_CARL9170FW_DEBUG
 996         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
 997
 998         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
 999 #endif /* CONFIG_CARL9170FW_DEBUG */
1000
1001         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
1002
1003         if (unlikely(intr))
1004                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
1005
1006         wlan_janitor();
1007
1008 #undef HANDLER
1009 }
1010
1011 static void wlan_check_hang(void)
1012 {
1013         struct dma_desc *desc;
1014         unsigned int i;
1015
1016         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1017                 if (queue_empty(&fw.wlan.tx_queue[i])) {
1018                         /* Nothing to do here... move along */
1019                         continue;
1020                 }
1021
1022                 /* fetch the current DMA queue position */
1023                 desc = get_wlan_txq_addr(i);
1024
1025                 /* Stuck frame detection */
1026                 if (unlikely(desc == fw.wlan.last_tx_desc[i])) {
1027                         fw.wlan.last_tx_desc_num[i]++;
1028
1029                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 6)) {
1030                                 /*
1031                                  * schedule MAC reset (aka OFF/ON => dead)
1032                                  *
1033                                  * This will almost certainly kill
1034                                  * the device for good, but it's the
1035                                  * recommended thing to do...
1036                                  */
1037
1038                                 fw.wlan.mac_reset++;
1039                         }
1040
1041 #ifdef CONFIG_CARL9170FW_DEBUG
1042                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 5)) {
1043                                 /*
1044                                  * Sigh, the queue is almost certainly
1045                                  * dead. Dump the queue content to the
1046                                  * user, maybe we find out why it got
1047                                  * so stuck.
1048                                  */
1049
1050                                 wlan_dump_queue(i);
1051                         }
1052 #endif /* CONFIG_CARL9170FW_DEBUG */
1053
1054 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1055                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 3)) {
1056                                 /*
1057                                  * Hrrm, bump the queue a bit.
1058                                  * maybe this will get it going again.
1059                                  */
1060
1061                                 wlan_dma_bump(i);
1062                                 wlan_trigger(BIT(i));
1063                         }
1064 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1065                 } else {
1066                         /* Nothing stuck */
1067                         fw.wlan.last_tx_desc[i] = desc;
1068                         fw.wlan.last_tx_desc_num[i] = 0;
1069                 }
1070         }
1071 }
1072
1073 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1074 /*
1075  * NB: Resetting the MAC is a two-edged sword.
1076  * On most occasions, it does what it is supposed to do.
1077  * But there is a chance that this will make it
1078  * even worse and the radio dies silently.
1079  */
1080 static void wlan_mac_reset(void)
1081 {
1082         uint32_t val;
1083         uint32_t agg_wait_counter;
1084         uint32_t agg_density;
1085         uint32_t bcn_start_addr;
1086         uint32_t rctl, rcth;
1087         uint32_t cam_mode;
1088         uint32_t ack_power;
1089         uint32_t rts_cts_tpc;
1090         uint32_t rts_cts_rate;
1091         unsigned int i;
1092
1093 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1094         uint32_t rx_BB;
1095 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1096
1097         INFO("MAC RESET");
1098
1099         /* Save aggregation parameters */
1100         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1101         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1102
1103         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1104
1105         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1106         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1107         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1108
1109         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1110         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1111         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1112
1113 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1114         /* 0x1c8960 write only */
1115         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1116 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1117
1118         /* TX/RX must be stopped by now */
1119         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1120
1121         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1122
1123         /*
1124          * Manipulate CCA threshold to stop transmission
1125          *
1126          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1127          */
1128
1129         /*
1130          * check Rx state in 0(idle) 9(disable)
1131          *
1132          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1133          * while( (chState != 0) && (chState != 9)) {
1134          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1135          * }
1136          */
1137
1138         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1139
1140         delay(2);
1141
1142         /* Restore aggregation parameters */
1143         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1144         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1145
1146         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1147         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1148         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1149         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1150
1151         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1152         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1153         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1154
1155 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1156         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1157 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1158
1159         /*
1160          * Manipulate CCA threshold to resume transmission
1161          *
1162          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1163          */
1164
1165         /* Reinitialize all WLAN TX DMA queues. */
1166         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1167                 struct dma_desc *iter;
1168
1169                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1170
1171                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1172                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1173                         wlan_trigger(BIT(i));
1174
1175                 DBG("Q:%d l:%d h:%p t:%p cu:%p it:%p ct:%x st:%x\n", i, queue_len(&fw.wlan.tx_queue[i]),
1176                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1177                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1178         }
1179
1180         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1181                             AR9170_MAC_INT_RETRY_FAIL;
1182
1183         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1184         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
1185 }
1186 #else
1187 static void wlan_mac_reset(void)
1188 {
1189         /* The driver takes care of reinitializing the device */
1190         BUG("MAC RESET");
1191 }
1192 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1193
1194 void __cold wlan_timer(void)
1195 {
1196         unsigned int cached_mac_reset;
1197
1198         cached_mac_reset = fw.wlan.mac_reset;
1199
1200         /* TX Queue Hang check */
1201         wlan_check_hang();
1202
1203         /* RX Overrun check */
1204         wlan_check_rx_overrun();
1205
1206         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1207                 wlan_mac_reset();
1208                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1209         } else {
1210                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1211                         fw.wlan.mac_reset--;
1212         }
1213 }