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 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
 296         wlan_tx_complete(super, true);
 297         unhide_super(desc);
 298 # ifdef CONFIG_CARL9170FW_LOOPBACK
 299         dma_put(&fw.pta.up_queue, desc);
 300         up_trigger();
 301 # elif CONFIG_CARL9170FW_DISCARD
 302         dma_reclaim(&fw.pta.down_queue, desc);
 303         down_trigger();
 304 # endif
 305 #else /* CONFIG_CARL9170FW_LOOPBACK */
 306
 307 # ifdef CONFIG_CARL9170FW_DEBUG
 308         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 309 # endif /* CONFIG_CARL9170FW_DEBUG */
 310
 311         /* insert desc into the right queue */
 312         dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
 313 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 314 }
 315
 316 static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
 317 {
 318         hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
 319         hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
 320
 321         if (!(hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG)))
 322                 fw.wlan.sequence[vif] += 0x10;
 323 }
 324
 325 /* prepares frame for the first transmission */
 326 static void _wlan_tx(struct dma_desc *desc)
 327 {
 328         struct carl9170_tx_superframe *super = get_super(desc);
 329
 330         if (unlikely(super->s.assign_seq))
 331                 wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
 332
 333         if (unlikely(super->s.ampdu_commit_density)) {
 334                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 335                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 336                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 337                             super->s.ampdu_density));
 338         }
 339
 340         if (unlikely(super->s.ampdu_commit_factor)) {
 341                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 342                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 343                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 344                             8 << super->s.ampdu_factor));
 345         }
 346 }
 347
 348 /* propagate transmission status back to the driver */
 349 static bool wlan_tx_status(struct dma_queue *queue,
 350                            struct dma_desc *desc)
 351 {
 352         struct carl9170_tx_superframe *super = get_super(desc);
 353         unsigned int qidx = super->s.queue;
 354         bool txfail = false, success;
 355
 356         success = true;
 357
 358         /* update hangcheck */
 359         fw.wlan.last_super_num[qidx] = 0;
 360
 361         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 362                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 363
 364                 /* reset retry indicator flags */
 365                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 366
 367                 if (wlan_tx_consume_retry(super)) {
 368                         /*
 369                          * retry for simple and aggregated 802.11 frames.
 370                          *
 371                          * Note: We must not mess up the original frame
 372                          * order.
 373                          */
 374
 375                         if (!super->f.hdr.mac.ampdu) {
 376                                 /*
 377                                  * 802.11 - 7.1.3.1.5.
 378                                  * set "Retry Field" for consecutive attempts
 379                                  *
 380                                  * Note: For AMPDU see:
 381                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 382                                  */
 383                                 super->f.data.i3e.frame_control |=
 384                                         cpu_to_le16(IEEE80211_FCTL_RETRY);
 385                         }
 386
 387                         if (txfail) {
 388                                 /* Normal TX Failure */
 389
 390                                 /* demise descriptor ownership back to the hardware */
 391                                 dma_rearm(desc);
 392
 393                                 /*
 394                                  * And this will get the queue going again.
 395                                  * To understand why: you have to get the HW
 396                                  * specs... But sadly I never saw them.
 397                                  */
 398                                 wlan_txunstuck(qidx);
 399
 400                                 /* abort cycle - this is necessary due to HW design */
 401                                 return false;
 402                         } else {
 403                                 /* (HT-) BlockACK failure */
 404
 405                                 /*
 406                                  * Unlink the failed attempt and put it into
 407                                  * the retry queue. The caller routine must
 408                                  * be aware of this so the frames don't get lost.
 409                                  */
 410
 411 #ifndef CONFIG_CARL9170FW_DEBUG
 412                                 dma_unlink_head(queue);
 413 #else /* CONFIG_CARL9170FW_DEBUG */
 414                                 BUG_ON(dma_unlink_head(queue) != desc);
 415 #endif /* CONFIG_CARL9170FW_DEBUG */
 416                                 dma_put(&fw.wlan.tx_retry, desc);
 417                                 return true;
 418                         }
 419                 } else {
 420                         /* out of frame attempts - discard frame */
 421                         success = false;
 422                 }
 423         }
 424
 425 #ifndef CONFIG_CARL9170FW_DEBUG
 426         dma_unlink_head(queue);
 427 #else /* CONFIG_CARL9170FW_DEBUG */
 428         BUG_ON(dma_unlink_head(queue) != desc);
 429 #endif /* CONFIG_CARL9170FW_DEBUG */
 430         if (txfail) {
 431                 /*
 432                  * Issue the queue bump,
 433                  * We need to do this in case this was the frame's last
 434                  * possible retry attempt and it unfortunately: it failed.
 435                  */
 436
 437                 wlan_txunstuck(qidx);
 438         }
 439
 440         unhide_super(desc);
 441
 442         if (unlikely(super == fw.wlan.fw_desc_data)) {
 443                 fw.wlan.fw_desc = desc;
 444                 fw.wlan.fw_desc_available = 1;
 445
 446                 if (fw.wlan.fw_desc_callback)
 447                         fw.wlan.fw_desc_callback(super, success);
 448
 449                 return true;
 450         }
 451
 452 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 453         if (unlikely(super->s.cab))
 454                 fw.wlan.cab_queue_len[super->s.vif_id]--;
 455 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 456
 457         wlan_tx_complete(super, success);
 458
 459         /* recycle freed descriptors */
 460         dma_reclaim(&fw.pta.down_queue, desc);
 461         down_trigger();
 462         return true;
 463 }
 464
 465 static void handle_tx_completion(void)
 466 {
 467         struct dma_desc *desc;
 468         int i;
 469
 470         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
 471                 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
 472                         if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
 473                                 /* termination requested. */
 474                                 break;
 475                         }
 476                 }
 477
 478                 wlan_tx_ampdu_reset(i);
 479
 480                 for_each_desc(desc, &fw.wlan.tx_retry)
 481                         __wlan_tx(desc);
 482
 483                 wlan_tx_ampdu_end(i);
 484                 if (!queue_empty(&fw.wlan.tx_queue[i]))
 485                         wlan_trigger(BIT(i));
 486         }
 487 }
 488
 489 void __hot wlan_tx(struct dma_desc *desc)
 490 {
 491         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 492
 493         /* initialize rate control struct */
 494         super->s.rix = 0;
 495         super->s.cnt = 1;
 496         hide_super(desc);
 497
 498 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 499         if (unlikely(super->s.cab)) {
 500                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 501                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 502                 return;
 503         }
 504 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 505
 506         _wlan_tx(desc);
 507         __wlan_tx(desc);
 508         wlan_trigger(BIT(super->s.queue));
 509 }
 510
 511 void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb)
 512 {
 513         if (!fw.wlan.fw_desc_available)
 514                 return;
 515
 516         fw.wlan.fw_desc_available = 0;
 517
 518         /* Format BlockAck */
 519         fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 520         fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW;
 521
 522         fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len;
 523         fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super;
 524         fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr =
 525                 fw.wlan.fw_desc;
 526         fw.wlan.fw_desc_callback = cb;
 527         wlan_tx(fw.wlan.fw_desc);
 528 }
 529
 530 static void wlan_send_buffered_ba(void)
 531 {
 532         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 533         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 534         struct carl9170_bar_ctx *ctx;
 535
 536         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 537                 return;
 538
 539         /* there's no point to continue when the ba_desc is not available. */
 540         if (!fw.wlan.fw_desc_available)
 541                 return;
 542
 543         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx];
 544         fw.wlan.ba_head_idx++;
 545         fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 546
 547         baf->s.len = sizeof(struct carl9170_tx_superdesc) +
 548                      sizeof(struct ar9170_tx_hwdesc) +
 549                      sizeof(struct ieee80211_ba);
 550         baf->s.ri[0].tries = 1;
 551         baf->s.cookie = 0;
 552         baf->s.queue = AR9170_TXQ_VO;
 553         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 554
 555         /* HW Duration / Backoff */
 556         baf->f.hdr.mac.backoff = 1;
 557         baf->f.hdr.mac.hw_duration = 1;
 558
 559         /* take the TX rate from the RX'd BAR */
 560         baf->f.hdr.phy.set = ctx->phy;
 561         baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 562
 563         /* format outgoing BA */
 564         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_NULLFUNC);
 565         ba->duration = cpu_to_le16(0);
 566         memcpy(ba->ta, ctx->ta, 6);
 567         memcpy(ba->ra, ctx->ra, 6);
 568
 569         /*
 570          * Unfortunately, we cannot look into the hardware's scoreboard.
 571          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 572          * and send a null BlockAck.
 573          */
 574         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 575
 576         /*
 577          * NB:
 578          * not entirely sure if this is 100% correct?!
 579          */
 580         ba->control = ctx->control | cpu_to_le16(1);
 581         ba->start_seq_num = ctx->start_seq_num;
 582         wlan_tx_fw(&baf->s, NULL);
 583 }
 584
 585 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 586 {
 587         struct carl9170_bar_ctx *tmp;
 588
 589         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx];
 590         fw.wlan.ba_tail_idx++;
 591         fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 592
 593         return tmp;
 594 }
 595
 596 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 597                        unsigned int len, unsigned int mac_err)
 598 {
 599         struct ieee80211_bar *bar;
 600         struct carl9170_bar_ctx *ctx;
 601
 602         if (unlikely(mac_err)) {
 603                 /*
 604                  * This check does a number of things:
 605                  * 1. checks if the frame is in good nick
 606                  * 2. checks if the RA (MAC) matches
 607                  */
 608                 return ;
 609         }
 610
 611         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 612                 /*
 613                  * Sneaky, corrupted BARs... but not with us!
 614                  */
 615
 616                 return ;
 617         }
 618
 619         bar = (void *) hdr;
 620
 621         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 622             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 623                 /* not implemented yet */
 624
 625                 return ;
 626         }
 627
 628         ctx = wlan_get_bar_cache_buffer();
 629
 630         /* Brilliant! The BAR provides all necessary MACs! */
 631         memcpy(ctx->ra, bar->ta, 6);
 632         memcpy(ctx->ta, bar->ra, 6);
 633
 634         /*
 635          * NB:
 636          * not entirely sure if this is 100% correct to force the
 637          * imm ack bit or not...
 638          */
 639         ctx->control = bar->control | cpu_to_le16(1);
 640         ctx->start_seq_num = bar->start_seq_num;
 641         ctx->phy = ar9170_rx_to_phy(desc);
 642         if (unlikely(!ctx->phy)) {
 643                 /* provide a backup, in case ar9170_rx_to_phy fails */
 644                 ctx->phy = cpu_to_le32(0x2cc301);
 645         }
 646 }
 647
 648 static void wlan_check_rx_overrun(void)
 649 {
 650         uint32_t overruns, total;
 651
 652         fw.tally.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 653         fw.tally.rx_overrun += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 654         if (unlikely(overruns)) {
 655                 if (overruns == total) {
 656                         DBG("RX Overrun");
 657                         fw.wlan.mac_reset++;
 658                 }
 659
 660                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 661         }
 662 }
 663
 664 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 665 {
 666         struct ieee80211_hdr *hdr;
 667         unsigned int data_len;
 668         unsigned int rx_filter;
 669         unsigned int mac_err;
 670
 671         data_len = ar9170_get_rx_mpdu_len(desc);
 672         mac_err = ar9170_get_rx_macstatus_error(desc);
 673
 674 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 675
 676         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 677             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 678             mac_err & AR9170_RX_ERROR_BAD) {
 679                 /*
 680                  * This frame is too damaged to do anything
 681                  * useful with it.
 682                  */
 683
 684                 return CARL9170_RX_FILTER_BAD;
 685         }
 686
 687         rx_filter = 0;
 688         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 689                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 690
 691         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 692                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 693
 694         hdr = ar9170_get_rx_i3e(desc);
 695         if (likely(ieee80211_is_data(hdr->frame_control))) {
 696                 rx_filter |= CARL9170_RX_FILTER_DATA;
 697         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 698                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 699                 case IEEE80211_STYPE_BACK_REQ:
 700                         handle_bar(desc, hdr, data_len, mac_err);
 701                         /* fallthrough */
 702                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 703                         break;
 704                 case IEEE80211_STYPE_PSPOLL:
 705                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 706                         break;
 707                 default:
 708                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 709                         break;
 710                 }
 711         } else {
 712                 /* ieee80211_is_mgmt */
 713                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 714         }
 715
 716         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 717                 wol_rx(rx_filter, hdr, min(data_len,
 718                         (unsigned int)AR9170_BLOCK_SIZE));
 719         }
 720
 721 #undef AR9170_RX_ERROR_BAD
 722
 723         return rx_filter;
 724 }
 725
 726 static void handle_rx(void)
 727 {
 728         struct dma_desc *desc;
 729
 730         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 731                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 732                         dma_put(&fw.pta.up_queue, desc);
 733                         up_trigger();
 734                 } else {
 735                         dma_reclaim(&fw.wlan.rx_queue, desc);
 736                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 737                 }
 738         }
 739 }
 740
 741 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 742 void wlan_cab_flush_queue(const unsigned int vif)
 743 {
 744         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 745         struct dma_desc *desc;
 746
 747         /* move queued frames into the main tx queues */
 748         for_each_desc(desc, cab_queue) {
 749                 struct carl9170_tx_superframe *super = get_super(desc);
 750                 if (!queue_empty(cab_queue)) {
 751                         /*
 752                          * Set MOREDATA flag for all,
 753                          * but the last queued frame.
 754                          * see: 802.11-2007 11.2.1.5 f)
 755                          *
 756                          * This is actually the reason to why
 757                          * we need to prevent the reentry.
 758                          */
 759
 760                         super->f.data.i3e.frame_control |=
 761                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 762                 } else {
 763                         super->f.data.i3e.frame_control &=
 764                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 765                 }
 766
 767                 /* ready to roll! */
 768                 _wlan_tx(desc);
 769                 __wlan_tx(desc);
 770                 wlan_trigger(BIT(super->s.queue));
 771         }
 772 }
 773
 774 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 775                                const unsigned int len)
 776 {
 777         struct ieee80211_mgmt *mgmt = addr;
 778         uint8_t *pos, *end;
 779
 780         pos = mgmt->u.beacon.variable;
 781         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 782         while (pos < end) {
 783                 if (pos + 2 + pos[1] > end)
 784                         return NULL;
 785
 786                 if (pos[0] == ie)
 787                         return pos;
 788
 789                 pos += pos[1] + 2;
 790         }
 791
 792         return NULL;
 793 }
 794
 795 void wlan_modify_beacon(const unsigned int vif,
 796         const unsigned int addr, const unsigned int len)
 797 {
 798         uint8_t *_ie;
 799         struct ieee80211_tim_ie *ie;
 800
 801         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 802         if (likely(_ie)) {
 803                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 804
 805                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 806                         /* schedule DTIM transfer */
 807                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 808                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 809                         /* undo all chances to the beacon structure */
 810                         ie->bitmap_ctrl &= ~0x1;
 811                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 812                 }
 813
 814                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 815                 if (fw.wlan.cab_flush_trigger[vif]) {
 816                         /* Set the almighty Multicast Traffic Indication Bit. */
 817                         ie->bitmap_ctrl |= 0x1;
 818                 }
 819         }
 820
 821         /*
 822          * Ideally, the sequence number should be assigned by the TX arbiter
 823          * hardware. But AFAIK that's not possible, so we have to go for the
 824          * next best thing and write it into the beacon fifo during the open
 825          * beacon update window.
 826          */
 827
 828         wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
 829 }
 830
 831 static void wlan_send_buffered_cab(void)
 832 {
 833         unsigned int i;
 834
 835         for (i = 0; i < CARL9170_INTF_NUM; i++) {
 836                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
 837                         /*
 838                          * This is hardcoded into carl9170usb driver.
 839                          *
 840                          * The driver must set the PRETBTT event to beacon_interval -
 841                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
 842                          *
 843                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
 844                          * 11.2.1.6. Let's hope the current solution is adequate enough.
 845                          */
 846
 847                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
 848                                 wlan_cab_flush_queue(i);
 849
 850                                 /*
 851                                  * This prevents the code from sending new BC/MC frames
 852                                  * which were queued after the previous buffered traffic
 853                                  * has been sent out... They will have to wait until the
 854                                  * next DTIM beacon comes along.
 855                                  */
 856                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
 857                         }
 858                 }
 859
 860         }
 861 }
 862 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 863
 864 static void handle_beacon_config(void)
 865 {
 866         uint32_t bcn_count;
 867
 868         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 869         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 870                          (uint8_t *) &bcn_count);
 871 }
 872
 873 static void handle_pretbtt(void)
 874 {
 875 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 876         fw.wlan.cab_flush_time = get_clock_counter();
 877 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 878
 879 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 880         rf_psm();
 881
 882         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 883                          (uint8_t *) &fw.phy.psm.state);
 884 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 885 }
 886
 887 static void handle_atim(void)
 888 {
 889         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 890 }
 891
 892 #ifdef CONFIG_CARL9170FW_DEBUG
 893 static void handle_qos(void)
 894 {
 895         /*
 896          * What is the QoS Bit used for?
 897          * Is it only an indicator for TXOP & Burst, or
 898          * should we do something here?
 899          */
 900 }
 901
 902 static void handle_radar(void)
 903 {
 904         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
 905 }
 906 #endif /* CONFIG_CARL9170FW_DEBUG */
 907
 908 static void wlan_janitor(void)
 909 {
 910 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 911         wlan_send_buffered_cab();
 912 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 913
 914         wlan_send_buffered_tx_status();
 915
 916         wlan_send_buffered_ba();
 917
 918         wol_janitor();
 919 }
 920
 921 void handle_wlan(void)
 922 {
 923         uint32_t intr;
 924
 925         intr = get(AR9170_MAC_REG_INT_CTRL);
 926         /* ACK Interrupt */
 927         set(AR9170_MAC_REG_INT_CTRL, intr);
 928
 929 #define HANDLER(intr, flag, func)                       \
 930         do {                                            \
 931                 if ((intr & flag) != 0) {               \
 932                         func();                         \
 933                 }                                       \
 934         } while (0)
 935
 936         intr |= fw.wlan.soft_int;
 937         fw.wlan.soft_int = 0;
 938
 939         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
 940
 941         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
 942
 943         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
 944
 945         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
 946                 handle_tx_completion);
 947
 948 #ifdef CONFIG_CARL9170FW_DEBUG
 949         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
 950
 951         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
 952 #endif /* CONFIG_CARL9170FW_DEBUG */
 953
 954         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
 955
 956         if (unlikely(intr))
 957                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
 958
 959         wlan_janitor();
 960
 961 #undef HANDLER
 962 }
 963
 964 enum {
 965         CARL9170FW_TX_MAC_BUMP = 4,
 966         CARL9170FW_TX_MAC_DEBUG = 6,
 967         CARL9170FW_TX_MAC_RESET = 7,
 968 };
 969
 970 static void wlan_check_hang(void)
 971 {
 972         struct dma_desc *desc;
 973         int i;
 974
 975         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
 976                 if (queue_empty(&fw.wlan.tx_queue[i])) {
 977                         /* Nothing to do here... move along */
 978                         continue;
 979                 }
 980
 981                 /* fetch the current DMA queue position */
 982                 desc = (struct dma_desc *)get_wlan_txq_addr(i);
 983
 984                 /* Stuck frame detection */
 985                 if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
 986                         fw.wlan.last_super_num[i]++;
 987
 988                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
 989                                 /*
 990                                  * schedule MAC reset (aka OFF/ON => dead)
 991                                  *
 992                                  * This will almost certainly kill
 993                                  * the device for good, but it's the
 994                                  * recommended thing to do...
 995                                  */
 996
 997                                 fw.wlan.mac_reset++;
 998                         }
 999
1000 #ifdef CONFIG_CARL9170FW_DEBUG
1001                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
1002                                 /*
1003                                  * Sigh, the queue is almost certainly
1004                                  * dead. Dump the queue content to the
1005                                  * user, maybe we find out why it got
1006                                  * so stuck.
1007                                  */
1008
1009                                 wlan_dump_queue(i);
1010                         }
1011 #endif /* CONFIG_CARL9170FW_DEBUG */
1012
1013 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1014                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
1015                                 /*
1016                                  * Hrrm, bump the queue a bit.
1017                                  * maybe this will get it going again.
1018                                  */
1019
1020                                 wlan_dma_bump(i);
1021                                 wlan_trigger(BIT(i));
1022                         }
1023 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1024                 } else {
1025                         /* Nothing stuck */
1026                         fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
1027                         fw.wlan.last_super_num[i] = 0;
1028                 }
1029         }
1030 }
1031
1032 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1033 /*
1034  * NB: Resetting the MAC is a two-edged sword.
1035  * On most occasions, it does what it is supposed to do.
1036  * But there is a chance that this will make it
1037  * even worse and the radio dies silently.
1038  */
1039 static void wlan_mac_reset(void)
1040 {
1041         uint32_t val;
1042         uint32_t agg_wait_counter;
1043         uint32_t agg_density;
1044         uint32_t bcn_start_addr;
1045         uint32_t rctl, rcth;
1046         uint32_t cam_mode;
1047         uint32_t ack_power;
1048         uint32_t rts_cts_tpc;
1049         uint32_t rts_cts_rate;
1050         int i;
1051
1052 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1053         uint32_t rx_BB;
1054 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1055
1056 #ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
1057         INFO("MAC RESET");
1058 #endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
1059
1060         /* Save aggregation parameters */
1061         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1062         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1063
1064         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1065
1066         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1067         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1068         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1069
1070         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1071         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1072         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1073
1074 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1075         /* 0x1c8960 write only */
1076         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1077 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1078
1079         /* TX/RX must be stopped by now */
1080         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1081
1082         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1083
1084         /*
1085          * Manipulate CCA threshold to stop transmission
1086          *
1087          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1088          */
1089
1090         /*
1091          * check Rx state in 0(idle) 9(disable)
1092          *
1093          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1094          * while( (chState != 0) && (chState != 9)) {
1095          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1096          * }
1097          */
1098
1099         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1100
1101         delay(2);
1102
1103         /* Restore aggregation parameters */
1104         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1105         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1106
1107         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1108         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1109         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1110         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1111
1112         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1113         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1114         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1115
1116 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1117         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1118 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1119
1120         /*
1121          * Manipulate CCA threshold to resume transmission
1122          *
1123          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1124          */
1125
1126         val = AR9170_DMA_TRIGGER_RXQ;
1127         /* Reinitialize all WLAN TX DMA queues. */
1128         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1129                 struct dma_desc *iter;
1130
1131                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1132
1133                 /* kill the stuck frame */
1134                 if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
1135                     fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
1136                     fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
1137                         struct carl9170_tx_superframe *super = get_super(iter);
1138
1139                         iter->status = AR9170_OWN_BITS_SW;
1140                         /*
1141                          * Mark the frame as failed.
1142                          * The BAFAIL flag allows the frame to sail through
1143                          * wlan_tx_status without much "unstuck" trouble.
1144                          */
1145                         iter->ctrl &= ~(AR9170_CTRL_FAIL);
1146                         iter->ctrl |= AR9170_CTRL_BAFAIL;
1147
1148                         super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
1149                         super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
1150
1151                         fw.wlan.last_super_num[i] = 0;
1152                         fw.wlan.last_super[i] = NULL;
1153                         iter = iter->lastAddr->nextAddr;
1154                 }
1155
1156                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1157                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1158                         val |= BIT(i);
1159
1160                 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]),
1161                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1162                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1163         }
1164
1165         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1166                             AR9170_MAC_INT_RETRY_FAIL;
1167
1168         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1169         wlan_trigger(val);
1170 }
1171 #else
1172 static void wlan_mac_reset(void)
1173 {
1174         /* The driver takes care of reinitializing the device */
1175         BUG("MAC RESET");
1176 }
1177 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1178
1179 void __cold wlan_timer(void)
1180 {
1181         unsigned int cached_mac_reset;
1182
1183         cached_mac_reset = fw.wlan.mac_reset;
1184
1185         /* TX Queue Hang check */
1186         wlan_check_hang();
1187
1188         /* RX Overrun check */
1189         wlan_check_rx_overrun();
1190
1191         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1192                 wlan_mac_reset();
1193                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1194         } else {
1195                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1196                         fw.wlan.mac_reset--;
1197         }
1198 }