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 2009-2011  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 "wol.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 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         super->s.cookie = 0;
 173
 174         /*
 175          * This field holds the number of tries of the rate in
 176          * the rate index field (rix).
 177          */
 178         status->rix = super->s.rix;
 179         status->tries = super->s.cnt;
 180         status->success = (txs) ? 1 : 0;
 181 }
 182
 183 static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
 184 {
 185         /* check if this was the last possible retry with this rate */
 186         if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) {
 187                 /* end of the road - indicate tx failure */
 188                 if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
 189                         return false;
 190
 191                 /* check if there are alternative rates available */
 192                 if (!super->s.rr[super->s.rix].set)
 193                         return false;
 194
 195                 /* try next retry rate */
 196                 super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
 197
 198                 /* finally - mark the old rate as USED */
 199                 super->s.rix++;
 200
 201                 /* update MAC flags */
 202                 super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot;
 203                 super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu;
 204
 205                 /* reinitialize try counter */
 206                 super->s.cnt = 1;
 207         } else {
 208                 /* just increase retry counter */
 209                 super->s.cnt++;
 210         }
 211
 212         return true;
 213 }
 214
 215 static inline u16 get_tid(struct ieee80211_hdr *hdr)
 216 {
 217         return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
 218 }
 219
 220 /* This function will only work on uint32_t-aligned pointers! */
 221 static bool same_hdr(const void *_d0, const void *_d1)
 222 {
 223         const uint32_t *d0 = _d0;
 224         const uint32_t *d1 = _d1;
 225
 226         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 227         return !((d0[0] ^ d1[0]) |                      /* FC + DU */
 228                  (d0[1] ^ d1[1]) |                      /* addr1 */
 229                  (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) |    /* addr2 + addr3 */
 230                  (d0[4] ^ d1[4]));                      /* addr3 */
 231 }
 232
 233 static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b)
 234 {
 235         return (get_tid(a) == get_tid(b)) || same_hdr(a, b);
 236 }
 237
 238 static void wlan_tx_ampdu_reset(unsigned int qidx)
 239 {
 240         fw.wlan.ampdu_prev[qidx] = NULL;
 241 }
 242
 243 static void wlan_tx_ampdu_end(unsigned int qidx)
 244 {
 245         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 246
 247         if (ht_prev)
 248                 ht_prev->f.hdr.mac.ba_end = 1;
 249
 250         wlan_tx_ampdu_reset(qidx);
 251 }
 252
 253 static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
 254 {
 255         unsigned int qidx = super->s.queue;
 256         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 257
 258         if (super->f.hdr.mac.ampdu) {
 259                 if (ht_prev &&
 260                     !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e))
 261                         ht_prev->f.hdr.mac.ba_end = 1;
 262                 else
 263                         super->f.hdr.mac.ba_end = 0;
 264
 265                 fw.wlan.ampdu_prev[qidx] = super;
 266         } else {
 267                 wlan_tx_ampdu_end(qidx);
 268         }
 269 }
 270
 271 /* for all tries */
 272 static void __wlan_tx(struct dma_desc *desc)
 273 {
 274         struct carl9170_tx_superframe *super = get_super(desc);
 275
 276         if (unlikely(super->s.fill_in_tsf)) {
 277                 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
 278                 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
 279
 280                 /*
 281                  * Truth be told: this is a hack.
 282                  *
 283                  * The *real* TSF is definitely going to be higher/older.
 284                  * But this hardware emulation code is head and shoulders
 285                  * above anything a driver can possibly do.
 286                  *
 287                  * (even, if it's got an accurate atomic clock source).
 288                  */
 289
 290                 read_tsf(tsf);
 291         }
 292
 293         wlan_tx_ampdu(super);
 294
 295 #ifdef CONFIG_CARL9170FW_DEBUG
 296         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 297 #endif /* CONFIG_CARL9170FW_DEBUG */
 298
 299         /* insert desc into the right queue */
 300         dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
 301 }
 302
 303 static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
 304 {
 305         hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
 306         hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
 307
 308         if (ieee80211_is_first_frag(hdr->seq_ctrl))
 309                 fw.wlan.sequence[vif] += 0x10;
 310 }
 311
 312 /* prepares frame for the first transmission */
 313 static void _wlan_tx(struct dma_desc *desc)
 314 {
 315         struct carl9170_tx_superframe *super = get_super(desc);
 316
 317         if (unlikely(super->s.assign_seq))
 318                 wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
 319
 320         if (unlikely(super->s.ampdu_commit_density)) {
 321                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 322                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 323                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 324                             super->s.ampdu_density));
 325         }
 326
 327         if (unlikely(super->s.ampdu_commit_factor)) {
 328                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 329                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 330                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 331                             8 << super->s.ampdu_factor));
 332         }
 333 }
 334
 335 /* propagate transmission status back to the driver */
 336 static bool wlan_tx_status(struct dma_queue *queue,
 337                            struct dma_desc *desc)
 338 {
 339         struct carl9170_tx_superframe *super = get_super(desc);
 340         unsigned int qidx = super->s.queue;
 341         bool txfail = false, success;
 342
 343         success = true;
 344
 345         /* update hangcheck */
 346         fw.wlan.last_super_num[qidx] = 0;
 347
 348         /*
 349          * Note:
 350          * There could be a corner case when the TXFAIL is set
 351          * even though the frame was properly ACKed by the peer:
 352          *   a BlockAckReq with the immediate policy will cause
 353          *   the receiving peer to produce a BlockACK unfortunately
 354          *   the MAC in this chip seems to be expecting a legacy
 355          *   ACK and marks the BAR as failed!
 356          */
 357
 358         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 359                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 360
 361                 /* reset retry indicator flags */
 362                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 363
 364                 /*
 365                  * Note: wlan_tx_consume_retry will override the old
 366                  * phy [CCK,OFDM, HT, BW20/40, MCS...] and mac vectors
 367                  * [AMPDU,RTS/CTS,...] therefore be careful when they
 368                  * are used.
 369                  */
 370                 if (wlan_tx_consume_retry(super)) {
 371                         /*
 372                          * retry for simple and aggregated 802.11 frames.
 373                          *
 374                          * Note: We must not mess up the original frame
 375                          * order.
 376                          */
 377
 378                         if (!super->f.hdr.mac.ampdu) {
 379                                 /*
 380                                  * 802.11 - 7.1.3.1.5.
 381                                  * set "Retry Field" for consecutive attempts
 382                                  *
 383                                  * Note: For AMPDU see:
 384                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 385                                  */
 386                                 super->f.data.i3e.frame_control |=
 387                                         cpu_to_le16(IEEE80211_FCTL_RETRY);
 388                         }
 389
 390                         if (txfail) {
 391                                 /* Normal TX Failure */
 392
 393                                 /* demise descriptor ownership back to the hardware */
 394                                 dma_rearm(desc);
 395
 396                                 /*
 397                                  * And this will get the queue going again.
 398                                  * To understand why: you have to get the HW
 399                                  * specs... But sadly I never saw them.
 400                                  */
 401                                 wlan_txunstuck(qidx);
 402
 403                                 /* abort cycle - this is necessary due to HW design */
 404                                 return false;
 405                         } else {
 406                                 /* (HT-) BlockACK failure */
 407
 408                                 /*
 409                                  * Unlink the failed attempt and put it into
 410                                  * the retry queue. The caller routine must
 411                                  * be aware of this so the frames don't get lost.
 412                                  */
 413
 414 #ifndef CONFIG_CARL9170FW_DEBUG
 415                                 dma_unlink_head(queue);
 416 #else /* CONFIG_CARL9170FW_DEBUG */
 417                                 BUG_ON(dma_unlink_head(queue) != desc);
 418 #endif /* CONFIG_CARL9170FW_DEBUG */
 419                                 dma_put(&fw.wlan.tx_retry, desc);
 420                                 return true;
 421                         }
 422                 } else {
 423                         /* out of frame attempts - discard frame */
 424                         success = false;
 425                 }
 426         }
 427
 428 #ifndef CONFIG_CARL9170FW_DEBUG
 429         dma_unlink_head(queue);
 430 #else /* CONFIG_CARL9170FW_DEBUG */
 431         BUG_ON(dma_unlink_head(queue) != desc);
 432 #endif /* CONFIG_CARL9170FW_DEBUG */
 433         if (txfail) {
 434                 /*
 435                  * Issue the queue bump,
 436                  * We need to do this in case this was the frame's last
 437                  * possible retry attempt and it unfortunately: it failed.
 438                  */
 439
 440                 wlan_txunstuck(qidx);
 441         }
 442
 443         unhide_super(desc);
 444
 445         if (unlikely(super == fw.wlan.fw_desc_data)) {
 446                 fw.wlan.fw_desc = desc;
 447                 fw.wlan.fw_desc_available = 1;
 448
 449                 if (fw.wlan.fw_desc_callback)
 450                         fw.wlan.fw_desc_callback(super, success);
 451
 452                 return true;
 453         }
 454
 455 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 456         if (unlikely(super->s.cab))
 457                 fw.wlan.cab_queue_len[super->s.vif_id]--;
 458 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 459
 460         if (unlikely(ieee80211_is_back_req(super->f.data.i3e.frame_control))) {
 461                 /*
 462                  * As explained above, the hardware seems to be
 463                  * incapable of matching BA to BARs. This is a
 464                  * problem especially with mac80211, because it
 465                  * does resent failed BARs which of course cause
 466                  * some mayhem in the receiver buffer at the HT
 467                  * peer on the other end.
 468                  */
 469                 success = true;
 470         }
 471
 472         wlan_tx_complete(super, success);
 473
 474         /* recycle freed descriptors */
 475         dma_reclaim(&fw.pta.down_queue, desc);
 476         down_trigger();
 477         return true;
 478 }
 479
 480 static void handle_tx_completion(void)
 481 {
 482         struct dma_desc *desc;
 483         int i;
 484
 485         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
 486                 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
 487                         if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
 488                                 /* termination requested. */
 489                                 break;
 490                         }
 491                 }
 492
 493                 wlan_tx_ampdu_reset(i);
 494
 495                 for_each_desc(desc, &fw.wlan.tx_retry)
 496                         __wlan_tx(desc);
 497
 498                 wlan_tx_ampdu_end(i);
 499                 if (!queue_empty(&fw.wlan.tx_queue[i]))
 500                         wlan_trigger(BIT(i));
 501         }
 502 }
 503
 504 void __hot wlan_tx(struct dma_desc *desc)
 505 {
 506         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 507
 508         /* initialize rate control struct */
 509         super->s.rix = 0;
 510         super->s.cnt = 1;
 511         hide_super(desc);
 512
 513 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 514         if (unlikely(super->s.cab)) {
 515                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 516                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 517                 return;
 518         }
 519 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 520
 521         _wlan_tx(desc);
 522         __wlan_tx(desc);
 523         wlan_trigger(BIT(super->s.queue));
 524 }
 525
 526 void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb)
 527 {
 528         if (!fw.wlan.fw_desc_available)
 529                 return;
 530
 531         fw.wlan.fw_desc_available = 0;
 532
 533         /* Format BlockAck */
 534         fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 535         fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW;
 536
 537         fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len;
 538         fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super;
 539         fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr =
 540                 fw.wlan.fw_desc;
 541         fw.wlan.fw_desc_callback = cb;
 542         wlan_tx(fw.wlan.fw_desc);
 543 }
 544
 545 static void wlan_send_buffered_ba(void)
 546 {
 547         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 548         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 549         struct carl9170_bar_ctx *ctx;
 550
 551         if (likely(!fw.wlan.queued_ba))
 552                 return;
 553
 554         /* there's no point to continue when the ba_desc is not available. */
 555         if (!fw.wlan.fw_desc_available)
 556                 return;
 557
 558         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx];
 559         fw.wlan.ba_head_idx++;
 560         fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 561         fw.wlan.queued_ba--;
 562
 563         baf->s.len = sizeof(struct carl9170_tx_superdesc) +
 564                      sizeof(struct ar9170_tx_hwdesc) +
 565                      sizeof(struct ieee80211_ba);
 566         baf->s.ri[0].tries = 1;
 567         baf->s.cookie = 0;
 568         baf->s.queue = AR9170_TXQ_VO;
 569         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 570
 571         baf->f.hdr.mac.no_ack = 1;
 572
 573         baf->f.hdr.phy.modulation = 1; /* OFDM */
 574         baf->f.hdr.phy.tx_power = 34; /* 17 dBm */
 575         baf->f.hdr.phy.chains = 1;
 576         baf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M;
 577
 578         /* format outgoing BA */
 579         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
 580         ba->duration = cpu_to_le16(0);
 581         memcpy(ba->ta, ctx->ta, 6);
 582         memcpy(ba->ra, ctx->ra, 6);
 583
 584         /*
 585          * Unfortunately, we cannot look into the hardware's scoreboard.
 586          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 587          * and send a null BlockAck.
 588          */
 589         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 590
 591         ba->control = ctx->control;
 592         ba->start_seq_num = ctx->start_seq_num;
 593         wlan_tx_fw(&baf->s, NULL);
 594 }
 595
 596 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 597 {
 598         struct carl9170_bar_ctx *tmp;
 599
 600         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx];
 601         fw.wlan.ba_tail_idx++;
 602         fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 603         if (fw.wlan.queued_ba < CONFIG_CARL9170FW_BACK_REQS_NUM)
 604                 fw.wlan.queued_ba++;
 605
 606         return tmp;
 607 }
 608
 609 static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr,
 610                        unsigned int len, unsigned int mac_err)
 611 {
 612         struct ieee80211_bar *bar;
 613         struct carl9170_bar_ctx *ctx;
 614
 615         if (unlikely(mac_err)) {
 616                 /*
 617                  * This check does a number of things:
 618                  * 1. checks if the frame is in good nick
 619                  * 2. checks if the RA (MAC) matches
 620                  */
 621                 return ;
 622         }
 623
 624         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 625                 /*
 626                  * Sneaky, corrupted BARs... but not with us!
 627                  */
 628
 629                 return ;
 630         }
 631
 632         bar = (void *) hdr;
 633
 634         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 635             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 636                 /* not implemented yet */
 637
 638                 return ;
 639         }
 640
 641         ctx = wlan_get_bar_cache_buffer();
 642
 643         /* Brilliant! The BAR provides all necessary MACs! */
 644         memcpy(ctx->ra, bar->ta, 6);
 645         memcpy(ctx->ta, bar->ra, 6);
 646         ctx->control = bar->control;
 647         ctx->start_seq_num = bar->start_seq_num;
 648 }
 649
 650 static void wlan_check_rx_overrun(void)
 651 {
 652         uint32_t overruns, total;
 653
 654         fw.tally.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 655         fw.tally.rx_overrun += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 656         if (unlikely(overruns)) {
 657                 if (overruns == total) {
 658                         DBG("RX Overrun");
 659                         fw.wlan.mac_reset++;
 660                 }
 661
 662                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 663         }
 664 }
 665
 666 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 667 {
 668         struct ieee80211_hdr *hdr;
 669         unsigned int data_len;
 670         unsigned int rx_filter;
 671         unsigned int mac_err;
 672
 673         data_len = ar9170_get_rx_mpdu_len(desc);
 674         mac_err = ar9170_get_rx_macstatus_error(desc);
 675
 676 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 677
 678         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 679             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 680             mac_err & AR9170_RX_ERROR_BAD) {
 681                 /*
 682                  * This frame is too damaged to do anything
 683                  * useful with it.
 684                  */
 685
 686                 return CARL9170_RX_FILTER_BAD;
 687         }
 688
 689         rx_filter = 0;
 690         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 691                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 692
 693         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 694                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 695
 696         hdr = ar9170_get_rx_i3e(desc);
 697         if (likely(ieee80211_is_data(hdr->frame_control))) {
 698                 rx_filter |= CARL9170_RX_FILTER_DATA;
 699         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 700                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 701                 case IEEE80211_STYPE_BACK_REQ:
 702                         handle_bar(desc, hdr, data_len, mac_err);
 703                         /* fallthrough */
 704                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 705                         break;
 706                 case IEEE80211_STYPE_PSPOLL:
 707                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 708                         break;
 709                 default:
 710                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 711                         break;
 712                 }
 713         } else {
 714                 /* ieee80211_is_mgmt */
 715                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 716         }
 717
 718         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 719                 wol_rx(rx_filter, hdr, min(data_len,
 720                         (unsigned int)AR9170_BLOCK_SIZE));
 721         }
 722
 723 #undef AR9170_RX_ERROR_BAD
 724
 725         return rx_filter;
 726 }
 727
 728 static void handle_rx(void)
 729 {
 730         struct dma_desc *desc;
 731
 732         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 733                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 734                         dma_put(&fw.pta.up_queue, desc);
 735                         up_trigger();
 736                 } else {
 737                         dma_reclaim(&fw.wlan.rx_queue, desc);
 738                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 739                 }
 740         }
 741 }
 742
 743 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 744 void wlan_cab_flush_queue(const unsigned int vif)
 745 {
 746         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 747         struct dma_desc *desc;
 748
 749         /* move queued frames into the main tx queues */
 750         for_each_desc(desc, cab_queue) {
 751                 struct carl9170_tx_superframe *super = get_super(desc);
 752                 if (!queue_empty(cab_queue)) {
 753                         /*
 754                          * Set MOREDATA flag for all,
 755                          * but the last queued frame.
 756                          * see: 802.11-2007 11.2.1.5 f)
 757                          *
 758                          * This is actually the reason to why
 759                          * we need to prevent the reentry.
 760                          */
 761
 762                         super->f.data.i3e.frame_control |=
 763                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 764                 } else {
 765                         super->f.data.i3e.frame_control &=
 766                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 767                 }
 768
 769                 /* ready to roll! */
 770                 _wlan_tx(desc);
 771                 __wlan_tx(desc);
 772                 wlan_trigger(BIT(super->s.queue));
 773         }
 774 }
 775
 776 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 777                                const unsigned int len)
 778 {
 779         struct ieee80211_mgmt *mgmt = addr;
 780         uint8_t *pos, *end;
 781
 782         pos = mgmt->u.beacon.variable;
 783         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 784         while (pos < end) {
 785                 if (pos + 2 + pos[1] > end)
 786                         return NULL;
 787
 788                 if (pos[0] == ie)
 789                         return pos;
 790
 791                 pos += pos[1] + 2;
 792         }
 793
 794         return NULL;
 795 }
 796
 797 void wlan_modify_beacon(const unsigned int vif,
 798         const unsigned int addr, const unsigned int len)
 799 {
 800         uint8_t *_ie;
 801         struct ieee80211_tim_ie *ie;
 802
 803         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 804         if (likely(_ie)) {
 805                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 806
 807                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 808                         /* schedule DTIM transfer */
 809                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 810                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 811                         /* undo all chances to the beacon structure */
 812                         ie->bitmap_ctrl &= ~0x1;
 813                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 814                 }
 815
 816                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 817                 if (fw.wlan.cab_flush_trigger[vif]) {
 818                         /* Set the almighty Multicast Traffic Indication Bit. */
 819                         ie->bitmap_ctrl |= 0x1;
 820                 }
 821         }
 822
 823         /*
 824          * Ideally, the sequence number should be assigned by the TX arbiter
 825          * hardware. But AFAIK that's not possible, so we have to go for the
 826          * next best thing and write it into the beacon fifo during the open
 827          * beacon update window.
 828          */
 829
 830         wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
 831 }
 832
 833 static void wlan_send_buffered_cab(void)
 834 {
 835         unsigned int i;
 836
 837         for (i = 0; i < CARL9170_INTF_NUM; i++) {
 838                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
 839                         /*
 840                          * This is hardcoded into carl9170usb driver.
 841                          *
 842                          * The driver must set the PRETBTT event to beacon_interval -
 843                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
 844                          *
 845                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
 846                          * 11.2.1.6. Let's hope the current solution is adequate enough.
 847                          */
 848
 849                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
 850                                 wlan_cab_flush_queue(i);
 851
 852                                 /*
 853                                  * This prevents the code from sending new BC/MC frames
 854                                  * which were queued after the previous buffered traffic
 855                                  * has been sent out... They will have to wait until the
 856                                  * next DTIM beacon comes along.
 857                                  */
 858                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
 859                         }
 860                 }
 861
 862         }
 863 }
 864 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 865
 866 static void handle_beacon_config(void)
 867 {
 868         uint32_t bcn_count;
 869
 870         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 871         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 872                          (uint8_t *) &bcn_count);
 873 }
 874
 875 static void handle_pretbtt(void)
 876 {
 877 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 878         fw.wlan.cab_flush_time = get_clock_counter();
 879 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 880
 881 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 882         rf_psm();
 883
 884         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 885                          (uint8_t *) &fw.phy.psm.state);
 886 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 887 }
 888
 889 static void handle_atim(void)
 890 {
 891         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 892 }
 893
 894 #ifdef CONFIG_CARL9170FW_DEBUG
 895 static void handle_qos(void)
 896 {
 897         /*
 898          * What is the QoS Bit used for?
 899          * Is it only an indicator for TXOP & Burst, or
 900          * should we do something here?
 901          */
 902 }
 903
 904 static void handle_radar(void)
 905 {
 906         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
 907 }
 908 #endif /* CONFIG_CARL9170FW_DEBUG */
 909
 910 static void wlan_janitor(void)
 911 {
 912 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 913         wlan_send_buffered_cab();
 914 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 915
 916         wlan_send_buffered_tx_status();
 917
 918         wlan_send_buffered_ba();
 919
 920         wol_janitor();
 921 }
 922
 923 void handle_wlan(void)
 924 {
 925         uint32_t intr;
 926
 927         intr = get(AR9170_MAC_REG_INT_CTRL);
 928         /* ACK Interrupt */
 929         set(AR9170_MAC_REG_INT_CTRL, intr);
 930
 931 #define HANDLER(intr, flag, func)                       \
 932         do {                                            \
 933                 if ((intr & flag) != 0) {               \
 934                         func();                         \
 935                 }                                       \
 936         } while (0)
 937
 938         intr |= fw.wlan.soft_int;
 939         fw.wlan.soft_int = 0;
 940
 941         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
 942
 943         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
 944
 945         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
 946
 947         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
 948                 handle_tx_completion);
 949
 950 #ifdef CONFIG_CARL9170FW_DEBUG
 951         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
 952
 953         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
 954 #endif /* CONFIG_CARL9170FW_DEBUG */
 955
 956         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
 957
 958         if (unlikely(intr))
 959                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
 960
 961         wlan_janitor();
 962
 963 #undef HANDLER
 964 }
 965
 966 enum {
 967         CARL9170FW_TX_MAC_BUMP = 4,
 968         CARL9170FW_TX_MAC_DEBUG = 6,
 969         CARL9170FW_TX_MAC_RESET = 7,
 970 };
 971
 972 static void wlan_check_hang(void)
 973 {
 974         struct dma_desc *desc;
 975         int i;
 976
 977         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
 978                 if (queue_empty(&fw.wlan.tx_queue[i])) {
 979                         /* Nothing to do here... move along */
 980                         continue;
 981                 }
 982
 983                 /* fetch the current DMA queue position */
 984                 desc = (struct dma_desc *)get_wlan_txq_addr(i);
 985
 986                 /* Stuck frame detection */
 987                 if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
 988                         fw.wlan.last_super_num[i]++;
 989
 990                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
 991                                 /*
 992                                  * schedule MAC reset (aka OFF/ON => dead)
 993                                  *
 994                                  * This will almost certainly kill
 995                                  * the device for good, but it's the
 996                                  * recommended thing to do...
 997                                  */
 998
 999                                 fw.wlan.mac_reset++;
1000                         }
1001
1002 #ifdef CONFIG_CARL9170FW_DEBUG
1003                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
1004                                 /*
1005                                  * Sigh, the queue is almost certainly
1006                                  * dead. Dump the queue content to the
1007                                  * user, maybe we find out why it got
1008                                  * so stuck.
1009                                  */
1010
1011                                 wlan_dump_queue(i);
1012                         }
1013 #endif /* CONFIG_CARL9170FW_DEBUG */
1014
1015 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1016                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
1017                                 /*
1018                                  * Hrrm, bump the queue a bit.
1019                                  * maybe this will get it going again.
1020                                  */
1021
1022                                 wlan_dma_bump(i);
1023                                 wlan_trigger(BIT(i));
1024                         }
1025 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1026                 } else {
1027                         /* Nothing stuck */
1028                         fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
1029                         fw.wlan.last_super_num[i] = 0;
1030                 }
1031         }
1032 }
1033
1034 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1035 /*
1036  * NB: Resetting the MAC is a two-edged sword.
1037  * On most occasions, it does what it is supposed to do.
1038  * But there is a chance that this will make it
1039  * even worse and the radio dies silently.
1040  */
1041 static void wlan_mac_reset(void)
1042 {
1043         uint32_t val;
1044         uint32_t agg_wait_counter;
1045         uint32_t agg_density;
1046         uint32_t bcn_start_addr;
1047         uint32_t rctl, rcth;
1048         uint32_t cam_mode;
1049         uint32_t ack_power;
1050         uint32_t rts_cts_tpc;
1051         uint32_t rts_cts_rate;
1052         int i;
1053
1054 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1055         uint32_t rx_BB;
1056 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1057
1058 #ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
1059         INFO("MAC RESET");
1060 #endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
1061
1062         /* Save aggregation parameters */
1063         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1064         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1065
1066         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1067
1068         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1069         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1070         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1071
1072         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1073         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1074         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1075
1076 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1077         /* 0x1c8960 write only */
1078         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1079 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1080
1081         /* TX/RX must be stopped by now */
1082         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1083
1084         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1085
1086         /*
1087          * Manipulate CCA threshold to stop transmission
1088          *
1089          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1090          */
1091
1092         /*
1093          * check Rx state in 0(idle) 9(disable)
1094          *
1095          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1096          * while( (chState != 0) && (chState != 9)) {
1097          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1098          * }
1099          */
1100
1101         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1102
1103         delay(2);
1104
1105         /* Restore aggregation parameters */
1106         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1107         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1108
1109         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1110         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1111         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1112         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1113
1114         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1115         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1116         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1117
1118 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1119         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1120 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1121
1122         /*
1123          * Manipulate CCA threshold to resume transmission
1124          *
1125          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1126          */
1127
1128         val = AR9170_DMA_TRIGGER_RXQ;
1129         /* Reinitialize all WLAN TX DMA queues. */
1130         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1131                 struct dma_desc *iter;
1132
1133                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1134
1135                 /* kill the stuck frame */
1136                 if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
1137                     fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
1138                     fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
1139                         struct carl9170_tx_superframe *super = get_super(iter);
1140
1141                         iter->status = AR9170_OWN_BITS_SW;
1142                         /*
1143                          * Mark the frame as failed.
1144                          * The BAFAIL flag allows the frame to sail through
1145                          * wlan_tx_status without much "unstuck" trouble.
1146                          */
1147                         iter->ctrl &= ~(AR9170_CTRL_FAIL);
1148                         iter->ctrl |= AR9170_CTRL_BAFAIL;
1149
1150                         super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
1151                         super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
1152
1153                         fw.wlan.last_super_num[i] = 0;
1154                         fw.wlan.last_super[i] = NULL;
1155                         iter = iter->lastAddr->nextAddr;
1156                 }
1157
1158                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1159                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1160                         val |= BIT(i);
1161
1162                 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]),
1163                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1164                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1165         }
1166
1167         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1168                             AR9170_MAC_INT_RETRY_FAIL;
1169
1170         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1171         wlan_trigger(val);
1172 }
1173 #else
1174 static void wlan_mac_reset(void)
1175 {
1176         /* The driver takes care of reinitializing the device */
1177         BUG("MAC RESET");
1178 }
1179 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1180
1181 void __cold wlan_timer(void)
1182 {
1183         unsigned int cached_mac_reset;
1184
1185         cached_mac_reset = fw.wlan.mac_reset;
1186
1187         /* TX Queue Hang check */
1188         wlan_check_hang();
1189
1190         /* RX Overrun check */
1191         wlan_check_rx_overrun();
1192
1193         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1194                 wlan_mac_reset();
1195                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1196         } else {
1197                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1198                         fw.wlan.mac_reset--;
1199         }
1200 }