carlfw/src/wlan.c

   1 /*
   2  * carl9170 firmware - used by the ar9170 wireless device
   3  *
   4  * Interface to the WLAN part of the chip
   5  *
   6  * Copyright (c) 2000-2005 ZyDAS Technology Corporation
   7  * Copyright (c) 2007-2009 Atheros Communications, Inc.
   8  * Copyright    2009    Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2009, 2010 Christian Lamparter <chunkeey@googlemail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "carl9170.h"
  27 #include "shared/phy.h"
  28 #include "hostif.h"
  29 #include "timer.h"
  30 #include "wl.h"
  31 #include "printf.h"
  32 #include "rf.h"
  33 #include "linux/ieee80211.h"
  34 #include "rom.h"
  35
  36 static void wlan_txunstuck(unsigned int queue)
  37 {
  38         set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1);
  39 }
  40
  41 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
  42 static void wlan_txupdate(unsigned int queue)
  43 {
  44         set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head));
  45 }
  46
  47 static void wlan_dma_bump(unsigned int qidx)
  48 {
  49         unsigned int offset = qidx;
  50         uint32_t status, trigger;
  51
  52         status = get(AR9170_MAC_REG_DMA_STATUS) >> 12;
  53         trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12;
  54
  55         while (offset != 0) {
  56                 status >>= 4;
  57                 trigger >>= 4;
  58                 offset--;
  59         }
  60
  61         status &= 0xf;
  62         trigger &= 0xf;
  63
  64         if ((trigger == 0xa) && (status == 0x8)) {
  65                 DBG("UNSTUCK");
  66                 wlan_txunstuck(qidx);
  67         } else {
  68                 DBG("UPDATE");
  69                 wlan_txupdate(qidx);
  70         }
  71 }
  72 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
  73
  74 #ifdef CONFIG_CARL9170FW_DEBUG
  75 static void wlan_dump_queue(unsigned int qidx)
  76 {
  77
  78         struct dma_desc *desc;
  79         struct carl9170_tx_superframe *super;
  80         int entries = 0;
  81
  82         __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
  83                 super = get_super(desc);
  84                 DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
  85                     desc->status, desc->ctrl, desc->totalLen,
  86                     desc->dataSize, desc->nextAddr, desc->lastAddr);
  87
  88                 DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
  89                     super->s.cookie, super->s.cnt, super->s.rix,
  90                     super->f.hdr.length, super->f.hdr.mac.set,
  91                     (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
  92                     super->f.data.i3e.frame_control);
  93
  94                 entries++;
  95         }
  96
  97         desc = get_wlan_txq_addr(qidx);
  98
  99         DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
 100             qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
 101             fw.wlan.tx_queue[qidx].head,
 102             desc, fw.wlan.tx_queue[qidx].terminator);
 103
 104         DBG("HW: t:%x s:%x ac:%x c:%x",
 105             (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
 106             (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
 107             (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
 108             (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
 109 }
 110 #endif /* CONFIG_CARL9170FW_DEBUG */
 111
 112 static void wlan_send_buffered_tx_status(void)
 113 {
 114         unsigned int len;
 115
 116         while (fw.wlan.tx_status_pending) {
 117                 len = min((unsigned int)fw.wlan.tx_status_pending,
 118                           CARL9170_RSP_TX_STATUS_NUM);
 119                 len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx);
 120
 121                 /*
 122                  * rather than memcpy each individual request into a large buffer,
 123                  * we _splice_ them all together.
 124                  *
 125                  * The only downside is however that we have to be careful around
 126                  * the edges of the tx_status_cache.
 127                  *
 128                  * Note:
 129                  * Each tx_status is about 2 bytes. However every command package
 130                  * must have a size which is a multiple of 4.
 131                  */
 132
 133                 send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3,
 134                                  CARL9170_RSP_TXCOMP, len, (void *)
 135                                  &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]);
 136
 137                 fw.wlan.tx_status_pending -= len;
 138                 fw.wlan.tx_status_head_idx += len;
 139                 fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM;
 140         }
 141 }
 142
 143 static struct carl9170_tx_status *wlan_get_tx_status_buffer(void)
 144 {
 145         struct carl9170_tx_status *tmp;
 146
 147         tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++];
 148         fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM;
 149
 150         if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM)
 151                 wlan_send_buffered_tx_status();
 152
 153         fw.wlan.tx_status_pending++;
 154
 155         return tmp;
 156 }
 157
 158 /* generate _aggregated_ tx_status for the host */
 159 static void wlan_tx_complete(struct carl9170_tx_superframe *super,
 160                              bool txs)
 161 {
 162         struct carl9170_tx_status *status;
 163
 164         status = wlan_get_tx_status_buffer();
 165
 166         /*
 167          * The *unique* cookie and AC_ID is used by the driver for
 168          * frame lookup.
 169          */
 170         status->cookie = super->s.cookie;
 171         status->queue = super->s.queue;
 172
 173         /*
 174          * This field holds the number of tries of the rate in
 175          * the rate index field (rix).
 176          */
 177         status->rix = super->s.rix;
 178         status->tries = super->s.cnt;
 179         status->success = (txs) ? 1 : 0;
 180 }
 181
 182 static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
 183 {
 184         /* check if this was the last possible retry with this rate */
 185         if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) {
 186                 /* end of the road - indicate tx failure */
 187                 if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
 188                         return false;
 189
 190                 /* check if there are alternative rates available */
 191                 if (!super->s.rr[super->s.rix].set)
 192                         return false;
 193
 194                 /* try next retry rate */
 195                 super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
 196
 197                 /* finally - mark the old rate as USED */
 198                 super->s.rix++;
 199
 200                 /* update MAC flags */
 201                 super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot;
 202                 super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu;
 203
 204                 /* reinitialize try counter */
 205                 super->s.cnt = 1;
 206         } else {
 207                 /* just increase retry counter */
 208                 super->s.cnt++;
 209         }
 210
 211         return true;
 212 }
 213
 214 static inline u16 get_tid(struct ieee80211_hdr *hdr)
 215 {
 216         return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
 217 }
 218
 219 /* This function will only work on uint32_t-aligned pointers! */
 220 static inline bool compare_ether_address(const void *_d0, const void *_d1)
 221 {
 222         const uint32_t *d0 = _d0;
 223         const uint32_t *d1 = _d1;
 224
 225         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 226         return !((d0[0] ^ d1[0]) | (unsigned short)(d0[1] ^ d1[1]));
 227 }
 228
 229 #ifdef CONFIG_CARL9170FW_TX_AMPDU
 230 static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
 231 {
 232         unsigned int qidx = super->s.queue;
 233         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 234
 235         if (!super->f.hdr.mac.ampdu) {
 236                 fw.wlan.ampdu_prev[qidx] = NULL;
 237
 238                 if (ht_prev)
 239                         ht_prev->f.hdr.mac.ba_end = 1;
 240         } else {
 241                 fw.wlan.ampdu_prev[qidx] = super;
 242
 243                 if (ht_prev && (get_tid(&super->f.data.i3e) != get_tid(&ht_prev->f.data.i3e) ||
 244                     !compare_ether_address(super->f.data.i3e.addr1, ht_prev->f.data.i3e.addr1)))
 245                         ht_prev->f.hdr.mac.ba_end = 1;
 246                 else
 247                         super->f.hdr.mac.ba_end = 0;
 248         }
 249 }
 250 #endif /* CONFIG_CARL9170FW_TX_AMPDU */
 251
 252 /* for all tries */
 253 static void __wlan_tx(struct dma_desc *desc)
 254 {
 255         struct carl9170_tx_superframe *super = get_super(desc);
 256
 257         if (unlikely(super->s.fill_in_tsf)) {
 258                 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
 259                 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
 260
 261                 /*
 262                  * Truth be told: this is a hack.
 263                  *
 264                  * The *real* TSF is definitely going to be higher/older.
 265                  * But this hardware emulation code is head and shoulders
 266                  * above anything a driver can possibly do.
 267                  *
 268                  * (even, if it's got an accurate atomic clock source).
 269                  */
 270
 271                 read_tsf(tsf);
 272         }
 273
 274 #ifdef CONFIG_CARL9170FW_TX_AMPDU
 275         wlan_tx_ampdu(super);
 276 #endif /* CONFIG_CARL9170FW_TX_AMPDU */
 277
 278 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
 279         wlan_tx_complete(super, true);
 280         unhide_super(desc);
 281 # ifdef CONFIG_CARL9170FW_LOOPBACK
 282         dma_put(&fw.pta.up_queue, desc);
 283         up_trigger();
 284 # elif CONFIG_CARL9170FW_DISCARD
 285         dma_reclaim(&fw.pta.down_queue, desc);
 286         down_trigger();
 287 # endif
 288 #else /* CONFIG_CARL9170FW_LOOPBACK */
 289
 290 # if ((defined CONFIG_CARL9170FW_DEBUG) && (defined CONFIG_CARL9170FW_PSM))
 291         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 292 # endif /* CONFIG_CARL9170FW_DEBUG && CONFIG_CARL9170FW_PSM */
 293
 294         /* insert desc into the right queue */
 295         dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
 296 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 297 }
 298
 299 static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
 300 {
 301         hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
 302         hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
 303
 304         if (!(hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG)))
 305                 fw.wlan.sequence[vif] += 0x10;
 306 }
 307
 308 /* prepares frame for the first transmission */
 309 static void _wlan_tx(struct dma_desc *desc)
 310 {
 311         struct carl9170_tx_superframe *super = get_super(desc);
 312
 313         if (unlikely(super->s.assign_seq)) {
 314                 wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
 315         }
 316
 317         if (unlikely(super->s.ampdu_commit_density)) {
 318                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 319                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 320                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 321                             super->s.ampdu_density));
 322         }
 323
 324         if (unlikely(super->s.ampdu_commit_factor)) {
 325                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 326                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 327                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 328                             8 << super->s.ampdu_factor));
 329         }
 330
 331         __wlan_tx(desc);
 332 }
 333
 334 /* propagate transmission status back to the driver */
 335 static bool wlan_tx_status(struct dma_queue *queue,
 336                            struct dma_desc *desc)
 337 {
 338         struct ar9170_tx_frame *frame = DESC_PAYLOAD(desc);
 339         struct carl9170_tx_superframe *super = get_super(desc);
 340         struct ieee80211_hdr *hdr = &super->f.data.i3e;
 341         unsigned int qidx = super->s.queue;
 342         bool txfail, success;
 343
 344         success = true;
 345
 346         /* update hangcheck */
 347         fw.wlan.last_tx_desc_num[qidx] = 0;
 348
 349         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 350                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 351
 352                 /* reset retry indicator flags */
 353                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 354
 355                 if (wlan_tx_consume_retry(super)) {
 356                         /*
 357                          * retry for simple and aggregated 802.11 frames.
 358                          *
 359                          * Note: We must not mess up the original frame
 360                          * order.
 361                          */
 362
 363                         if (!frame->hdr.mac.ampdu) {
 364                                 /*
 365                                  * 802.11 - 7.1.3.1.5.
 366                                  * set "Retry Field" for consecutive attempts
 367                                  *
 368                                  * Note: For AMPDU see:
 369                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 370                                  */
 371
 372                                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
 373                         }
 374
 375                         if (txfail) {
 376                                 /* Normal TX Failure */
 377
 378                                 /* demise descriptor ownership back to the hardware */
 379                                 dma_rearm(desc);
 380
 381                                 /*
 382                                  * And this will get the queue going again.
 383                                  * To understand why: you have to get the HW
 384                                  * specs... But sadly I never saw them.
 385                                  */
 386                                 wlan_txunstuck(qidx);
 387
 388                                 /* abort cycle - this is necessary due to HW design */
 389                                 return false;
 390                         } else {
 391                                 /* (HT-) BlockACK failure */
 392
 393                                 /*
 394                                  * Unlink the failed attempt and put it into
 395                                  * the retry queue. The caller routine must
 396                                  * be aware of this so the frames don't get lost.
 397                                  */
 398
 399                                 dma_unlink_head(queue);
 400 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 401                                 dma_put(&fw.wlan.tx_retry, desc);
 402 #else
 403                                 __wlan_tx(desc);
 404 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 405                                 return true;
 406                         }
 407                 } else {
 408                         /* out of frame attempts - discard frame */
 409                         success = false;
 410                 }
 411         }
 412
 413         dma_unlink_head(queue);
 414         if (txfail) {
 415                 /*
 416                  * Issue the queue bump,
 417                  * We need to do this in case this was the frame's last
 418                  * possible retry attempt and it unfortunately: it failed.
 419                  */
 420
 421                 wlan_txunstuck(qidx);
 422         }
 423
 424         unhide_super(desc);
 425
 426 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 427         if (unlikely(super == (void *) &dma_mem.reserved.ba)) {
 428                 fw.wlan.ba_desc = desc;
 429                 fw.wlan.ba_desc_available = 1;
 430                 return true;
 431         }
 432 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 433
 434         wlan_tx_complete(super, success);
 435
 436 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 437         if (unlikely(super->s.cab))
 438                 fw.wlan.cab_queue_len[super->s.vif_id]--;
 439 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 440
 441         /* recycle freed descriptors */
 442         dma_reclaim(&fw.pta.down_queue, desc);
 443         down_trigger();
 444         return true;
 445 }
 446
 447 static void handle_tx_completion(void)
 448 {
 449         struct dma_desc *desc;
 450         unsigned int i;
 451
 452         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
 453                 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
 454                         if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
 455                                 /* termination requested. */
 456                                 break;
 457                         }
 458                 }
 459
 460 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 461                 for_each_desc(desc, &fw.wlan.tx_retry)
 462                         __wlan_tx(desc);
 463
 464                 for_each_desc(desc, &fw.wlan.tx_delay[i])
 465                         _wlan_tx(desc);
 466 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 467                 wlan_trigger(BIT(i));
 468         }
 469 }
 470
 471 void __hot wlan_tx(struct dma_desc *desc)
 472 {
 473         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 474
 475         /* initialize rate control struct */
 476         super->s.rix = 0;
 477         super->s.cnt = 1;
 478         hide_super(desc);
 479
 480 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 481         if (unlikely(super->s.cab)) {
 482                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 483                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 484                 return;
 485         }
 486 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 487
 488 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 489         if (!queue_empty(&fw.wlan.tx_queue[super->s.queue])) {
 490                 dma_put(&fw.wlan.tx_delay[super->s.queue], desc);
 491                 return;
 492         }
 493 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 494
 495         _wlan_tx(desc);
 496         wlan_trigger(BIT(super->s.queue));
 497 }
 498
 499 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 500 static void wlan_send_buffered_ba(void)
 501 {
 502         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 503         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 504         struct carl9170_bar_ctx *ctx;
 505
 506         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 507                 return;
 508
 509         /* there's no point to continue when the ba_desc is not available. */
 510         if (!fw.wlan.ba_desc_available)
 511                 return;
 512
 513         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 514         fw.wlan.ba_head_idx++;
 515
 516         /* Format BlockAck */
 517         fw.wlan.ba_desc->status = 0;
 518         fw.wlan.ba_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 519         fw.wlan.ba_desc_available = 0;
 520         fw.wlan.ba_desc->nextAddr = fw.wlan.ba_desc->lastAddr =
 521                 fw.wlan.ba_desc;
 522
 523         baf->s.len = fw.wlan.ba_desc->totalLen = fw.wlan.ba_desc->dataSize =
 524                 sizeof(struct carl9170_tx_superdesc) +
 525                 sizeof(struct ar9170_tx_hwdesc) +
 526                 sizeof(struct ieee80211_ba);
 527
 528         baf->s.ri[0].tries = 3;
 529         baf->s.queue = 0;
 530         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 531
 532         /* HW Duration / Backoff */
 533         baf->f.hdr.mac.backoff = 1;
 534         baf->f.hdr.mac.hw_duration = 1;
 535
 536         /* take the TX rate from the RX'd BAR */
 537         baf->f.hdr.phy.set = ctx->phy;
 538         baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 539
 540         /* format outgoing BA */
 541         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
 542         ba->duration = cpu_to_le16(0);
 543         memcpy(ba->ta, ctx->ta, 6);
 544         memcpy(ba->ra, ctx->ra, 6);
 545
 546         /*
 547          * Unfortunately, we cannot look into the hardware's scoreboard.
 548          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 549          * and send a null BlockAck.
 550          */
 551         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 552
 553         /*
 554          * NB:
 555          * not entirely sure if this is 100% correct?!
 556          */
 557         ba->control = ctx->control | cpu_to_le16(1);
 558         ba->start_seq_num = ctx->start_seq_num;
 559
 560         wlan_tx(fw.wlan.ba_desc);
 561 }
 562
 563 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 564 {
 565         struct carl9170_bar_ctx *tmp;
 566
 567         /* expire oldest entry, if we ran out of ba_ctx' */
 568         if (fw.wlan.ba_head_idx + CONFIG_CARL9170FW_BACK_REQS_NUM < fw.wlan.ba_tail_idx)
 569                 fw.wlan.ba_head_idx++;
 570
 571         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 572         fw.wlan.ba_tail_idx++;
 573
 574         return tmp;
 575 }
 576
 577 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 578                        unsigned int len, unsigned int mac_err)
 579 {
 580         struct ieee80211_bar *bar;
 581         struct carl9170_bar_ctx *ctx;
 582
 583         if (unlikely(mac_err)) {
 584                 /*
 585                  * This check does a number of things:
 586                  * 1. checks if the frame is in good nick
 587                  * 2. checks if the RA (MAC) matches
 588                  */
 589                 return ;
 590         }
 591
 592         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 593                 /*
 594                  * Sneaky, corrupted BARs... but not with us!
 595                  */
 596
 597                 return ;
 598         }
 599
 600         bar = (void *) hdr;
 601
 602         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 603             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 604                 /* not implemented yet */
 605
 606                 return ;
 607         }
 608
 609         ctx = wlan_get_bar_cache_buffer();
 610
 611         /* Brilliant! The BAR provides all necessary MACs! */
 612         memcpy(ctx->ra, bar->ta, 6);
 613         memcpy(ctx->ta, bar->ra, 6);
 614
 615         /*
 616          * NB:
 617          * not entirely sure if this is 100% correct to force the
 618          * imm ack bit or not...
 619          */
 620         ctx->control = bar->control | cpu_to_le16(1);
 621         ctx->start_seq_num = bar->start_seq_num;
 622         ctx->phy = ar9170_rx_to_phy(desc);
 623         if (unlikely(!ctx->phy)) {
 624                 /* provide a backup, in case ar9170_rx_to_phy fails */
 625                 ctx->phy = cpu_to_le32(0x2cc301);
 626         }
 627 }
 628 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 629
 630 static void wlan_check_rx_overrun(void)
 631 {
 632         uint32_t overruns, total;
 633
 634         fw.wlan.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 635         fw.wlan.rx_overruns += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 636         if (unlikely(overruns)) {
 637                 if (overruns == total) {
 638                         DBG("RX Overrun");
 639                         fw.wlan.mac_reset++;
 640                 }
 641
 642                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 643         }
 644 }
 645
 646 #ifdef CONFIG_CARL9170FW_WOL
 647 static void wlan_rx_wol(struct ieee80211_hdr *hdr, unsigned int len)
 648 {
 649         const unsigned char *data, *end, *mac;
 650         unsigned int found = 0;
 651
 652         /*
 653          * LIMITATION:
 654          * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
 655          * for MAGIC patterns!
 656          */
 657
 658         /*
 659          * TODO:
 660          * Currently, the MAGIC MAC Address is fixed to the EEPROM default.
 661          * It's possible to make it fully configurable, e.g:
 662          *
 663          * mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
 664          * But this will clash with the driver's suspend path, because it
 665          * needs to reset the registers.
 666          */
 667         mac = rom.sys.mac_address;
 668
 669         data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
 670         end = (u8 *)((unsigned long)hdr + len);
 671
 672         /*
 673          * scan for standard WOL Magic frame
 674          *
 675          * "A physical WakeOnLAN (Magic Packet) will look like this:
 676          * ---------------------------------------------------------------
 677          * | Synchronization Stream |  Target MAC |  Password (optional) |
 678          * |    6 octets            |   96 octets |   0, 4 or 6          |
 679          * ---------------------------------------------------------------
 680          *
 681          * The Synchronization Stream is defined as 6 bytes of FFh.
 682          * The Target MAC block contains 16 duplications of the IEEEaddress
 683          * of the target, with no breaks or interruptions.
 684          *
 685          * The Password field is optional, but if present, contains either
 686          * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
 687          * dissect the password, if present, according to the command-line
 688          * format that ether-wake uses, therefore, if a 4-byte password is
 689          * present, it will be dissected as an IPv4 address and if a 6-byte
 690          * password is present, it will be dissected as an Ethernet address.
 691          *
 692          * <http://wiki.wireshark.org/WakeOnLAN>
 693          */
 694
 695         while (data < end) {
 696                 if (found >= 6) {
 697                         if (*data == mac[found % 6])
 698                                 found++;
 699                         else
 700                                 found = 0;
 701                 }
 702
 703                 /* previous check might reset found counter */
 704                 if (found < 6) {
 705                         if (*data == 0xff)
 706                                 found++;
 707                         else
 708                                 found = 0;
 709                 }
 710
 711                 if (found == (6 + 16 * 6)) {
 712                         fw.suspend_mode = CARL9170_AWAKE_HOST;
 713                         return;
 714                 }
 715
 716                 data++;
 717         }
 718
 719         return;
 720 }
 721 #endif /* CONFIG_CARL9170FW_WOL */
 722
 723 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 724 {
 725         struct ieee80211_hdr *hdr;
 726         unsigned int data_len;
 727         unsigned int rx_filter;
 728         unsigned int mac_err;
 729
 730         data_len = ar9170_get_rx_mpdu_len(desc);
 731         mac_err = ar9170_get_rx_macstatus_error(desc);
 732
 733 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 734
 735         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 736             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 737             mac_err & AR9170_RX_ERROR_BAD) {
 738                 /*
 739                  * This frame is too damaged to do anything
 740                  * useful with it.
 741                  */
 742
 743                 return CARL9170_RX_FILTER_BAD;
 744         }
 745
 746         rx_filter = 0;
 747         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 748                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 749
 750         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 751                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 752
 753         hdr = ar9170_get_rx_i3e(desc);
 754         if (likely(ieee80211_is_data(hdr->frame_control))) {
 755                 rx_filter |= CARL9170_RX_FILTER_DATA;
 756         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 757                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 758                 case IEEE80211_STYPE_BACK_REQ:
 759 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 760                         handle_bar(desc, hdr, data_len, mac_err);
 761 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 762                         /* fallthrough */
 763                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 764                         break;
 765                 case IEEE80211_STYPE_PSPOLL:
 766                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 767                         break;
 768                 default:
 769                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 770                         break;
 771                 }
 772         } else {
 773                 /* ieee80211_is_mgmt */
 774                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 775         }
 776
 777 #ifdef CONFIG_CARL9170FW_WOL
 778         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 779                 if (rx_filter & CARL9170_RX_FILTER_DATA)
 780                         wlan_rx_wol(hdr, min(data_len,
 781                                     (unsigned int)AR9170_BLOCK_SIZE));
 782         }
 783 #endif /* CONFIG_CARL9170FW_WOL */
 784
 785 #undef AR9170_RX_ERROR_BAD
 786
 787         return rx_filter;
 788 }
 789
 790 static void handle_rx(void)
 791 {
 792         struct dma_desc *desc;
 793
 794         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 795                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 796                         dma_put(&fw.pta.up_queue, desc);
 797                         up_trigger();
 798                 } else {
 799                         dma_reclaim(&fw.wlan.rx_queue, desc);
 800                         _wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 801                 }
 802         }
 803 }
 804
 805 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 806 void wlan_cab_flush_queue(const unsigned int vif)
 807 {
 808         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 809         struct dma_desc *desc;
 810
 811         /* move queued frames into the main tx queues */
 812         for_each_desc(desc, cab_queue) {
 813                 struct carl9170_tx_superframe *super = get_super(desc);
 814                 if (!queue_empty(cab_queue)) {
 815                         /*
 816                          * Set MOREDATA flag for all,
 817                          * but the last queued frame.
 818                          * see: 802.11-2007 11.2.1.5 f)
 819                          *
 820                          * This is actually the reason to why
 821                          * we need to prevent the reentry.
 822                          */
 823
 824                         super->f.data.i3e.frame_control |=
 825                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 826                 } else {
 827                         super->f.data.i3e.frame_control &=
 828                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 829                 }
 830
 831                 /* ready to roll! */
 832                 _wlan_tx(desc);
 833                 wlan_trigger(BIT(super->s.queue));
 834         }
 835 }
 836
 837 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 838                                const unsigned int len)
 839 {
 840         struct ieee80211_mgmt *mgmt = addr;
 841         uint8_t *pos, *end;
 842
 843         pos = mgmt->u.beacon.variable;
 844         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 845         while (pos < end) {
 846                 if (pos + 2 + pos[1] > end)
 847                         return NULL;
 848
 849                 if (pos[0] == ie)
 850                         return pos;
 851
 852                 pos += pos[1] + 2;
 853         }
 854
 855         return NULL;
 856 }
 857
 858 void wlan_modify_beacon(const unsigned int vif,
 859         const unsigned int addr, const unsigned int len)
 860 {
 861         uint8_t *_ie;
 862         struct ieee80211_tim_ie *ie;
 863
 864         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 865         if (likely(_ie)) {
 866                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 867
 868                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 869                         /* schedule DTIM transfer */
 870                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 871                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 872                         /* undo all chances to the beacon structure */
 873                         ie->bitmap_ctrl &= ~0x1;
 874                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 875                 }
 876
 877                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 878                 if (fw.wlan.cab_flush_trigger[vif]) {
 879                         /* Set the almighty Multicast Traffic Indication Bit. */
 880                         ie->bitmap_ctrl |= 0x1;
 881                 }
 882         }
 883
 884         /*
 885          * Ideally, the sequence number should be assigned by the TX arbiter
 886          * hardware. But AFAIK that's not possible, so we have to go for the
 887          * next best thing and write it into the beacon fifo during the open
 888          * beacon update window.
 889          */
 890
 891         wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
 892 }
 893 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 894
 895 static void handle_beacon_config(void)
 896 {
 897         uint32_t bcn_count;
 898
 899         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 900         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 901                          (uint8_t *) &bcn_count);
 902 }
 903
 904 static void handle_pretbtt(void)
 905 {
 906 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 907         fw.wlan.cab_flush_time = get_clock_counter();
 908 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 909
 910 #ifdef CONFIG_CARL9170FW_PSM
 911         rf_psm();
 912
 913         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 914                          (uint8_t *) &fw.phy.psm.state);
 915 #else
 916         send_cmd_to_host(0, CARL9170_RSP_PRETBTT, 0x00, NULL);
 917 #endif /* CONFIG_CARL9170FW_PSM */
 918 }
 919
 920 static void handle_atim(void)
 921 {
 922         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 923 }
 924
 925 #ifdef CONFIG_CARL9170FW_DEBUG
 926 static void handle_qos(void)
 927 {
 928         /*
 929          * What is the QoS Bit used for?
 930          * Is it only an indicator for TXOP & Burst, or
 931          * should we do something here?
 932          */
 933 }
 934
 935 static void handle_radar(void)
 936 {
 937         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
 938 }
 939 #endif /* CONFIG_CARL9170FW_DEBUG */
 940
 941 static void wlan_janitor(void)
 942 {
 943 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 944         unsigned int i;
 945
 946         for (i = 0; i < CARL9170_INTF_NUM; i++) {
 947                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
 948                         /*
 949                          * This is hardcoded into carl9170usb driver.
 950                          *
 951                          * The driver must set the PRETBTT event to beacon_interval -
 952                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
 953                          *
 954                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
 955                          * 11.2.1.6. Let's hope the current solution is adequate enough.
 956                          */
 957
 958                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
 959                                 wlan_cab_flush_queue(i);
 960
 961                                 /*
 962                                  * This prevents the code from sending new BC/MC frames
 963                                  * which were queued after the previous buffered traffic
 964                                  * has been sent out... They will have to wait until the
 965                                  * next DTIM beacon comes along.
 966                                  */
 967                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
 968                         }
 969                 }
 970
 971         }
 972 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 973
 974 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 975         if (fw.wlan.tx_trigger) {
 976                 _wlan_trigger(fw.wlan.tx_trigger);
 977                 fw.wlan.tx_trigger = 0;
 978         }
 979 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 980
 981         wlan_send_buffered_tx_status();
 982
 983 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 984         wlan_send_buffered_ba();
 985 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 986 }
 987
 988 void handle_wlan(void)
 989 {
 990         uint32_t intr;
 991
 992         intr = get(AR9170_MAC_REG_INT_CTRL);
 993         /* ACK Interrupt */
 994         set(AR9170_MAC_REG_INT_CTRL, intr);
 995
 996 #define HANDLER(intr, flag, func)                       \
 997         do {                                            \
 998                 if ((intr & flag) != 0) {               \
 999                         func();                         \
1000                 }                                       \
1001         } while (0)
1002
1003         intr |= fw.wlan.soft_int;
1004         fw.wlan.soft_int = 0;
1005
1006         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
1007
1008         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
1009
1010         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
1011
1012         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
1013                 handle_tx_completion);
1014
1015 #ifdef CONFIG_CARL9170FW_DEBUG
1016         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
1017
1018         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
1019 #endif /* CONFIG_CARL9170FW_DEBUG */
1020
1021         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
1022
1023         if (unlikely(intr))
1024                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
1025
1026         wlan_janitor();
1027
1028 #undef HANDLER
1029 }
1030
1031 static void wlan_check_hang(void)
1032 {
1033         struct dma_desc *desc;
1034         unsigned int i;
1035
1036         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1037                 if (queue_empty(&fw.wlan.tx_queue[i])) {
1038                         /* Nothing to do here... move along */
1039                         continue;
1040                 }
1041
1042                 /* fetch the current DMA queue position */
1043                 desc = get_wlan_txq_addr(i);
1044
1045                 /* Stuck frame detection */
1046                 if (unlikely(desc == fw.wlan.last_tx_desc[i])) {
1047                         fw.wlan.last_tx_desc_num[i]++;
1048
1049                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 6)) {
1050                                 /*
1051                                  * schedule MAC reset (aka OFF/ON => dead)
1052                                  *
1053                                  * This will almost certainly kill
1054                                  * the device for good, but it's the
1055                                  * recommended thing to do...
1056                                  */
1057
1058                                 fw.wlan.mac_reset++;
1059                         }
1060
1061 #ifdef CONFIG_CARL9170FW_DEBUG
1062                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 5)) {
1063                                 /*
1064                                  * Sigh, the queue is almost certainly
1065                                  * dead. Dump the queue content to the
1066                                  * user, maybe we find out why it got
1067                                  * so stuck.
1068                                  */
1069
1070                                 wlan_dump_queue(i);
1071                         }
1072 #endif /* CONFIG_CARL9170FW_DEBUG */
1073
1074 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1075                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 3)) {
1076                                 /*
1077                                  * Hrrm, bump the queue a bit.
1078                                  * maybe this will get it going again.
1079                                  */
1080
1081                                 wlan_dma_bump(i);
1082                                 wlan_trigger(BIT(i));
1083                         }
1084 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1085                 } else {
1086                         /* Nothing stuck */
1087                         fw.wlan.last_tx_desc[i] = desc;
1088                         fw.wlan.last_tx_desc_num[i] = 0;
1089                 }
1090         }
1091 }
1092
1093 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1094 /*
1095  * NB: Resetting the MAC is a two-edged sword.
1096  * On most occasions, it does what it is supposed to do.
1097  * But there is a chance that this will make it
1098  * even worse and the radio dies silently.
1099  */
1100 static void wlan_mac_reset(void)
1101 {
1102         uint32_t val;
1103         uint32_t agg_wait_counter;
1104         uint32_t agg_density;
1105         uint32_t bcn_start_addr;
1106         uint32_t rctl, rcth;
1107         uint32_t cam_mode;
1108         uint32_t ack_power;
1109         uint32_t rts_cts_tpc;
1110         uint32_t rts_cts_rate;
1111         unsigned int i;
1112
1113 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1114         uint32_t rx_BB;
1115 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1116
1117         INFO("MAC RESET");
1118
1119         /* Save aggregation parameters */
1120         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1121         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1122
1123         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1124
1125         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1126         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1127         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1128
1129         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1130         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1131         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1132
1133 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1134         /* 0x1c8960 write only */
1135         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1136 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1137
1138         /* TX/RX must be stopped by now */
1139         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1140
1141         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1142
1143         /*
1144          * Manipulate CCA threshold to stop transmission
1145          *
1146          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1147          */
1148
1149         /*
1150          * check Rx state in 0(idle) 9(disable)
1151          *
1152          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1153          * while( (chState != 0) && (chState != 9)) {
1154          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1155          * }
1156          */
1157
1158         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1159
1160         delay(2);
1161
1162         /* Restore aggregation parameters */
1163         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1164         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1165
1166         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1167         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1168         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1169         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1170
1171         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1172         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1173         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1174
1175 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1176         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1177 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1178
1179         /*
1180          * Manipulate CCA threshold to resume transmission
1181          *
1182          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1183          */
1184
1185         /* Reinitialize all WLAN TX DMA queues. */
1186         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1187                 struct dma_desc *iter;
1188
1189                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1190
1191                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1192                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1193                         wlan_trigger(BIT(i));
1194
1195                 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]),
1196                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1197                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1198         }
1199
1200         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1201                             AR9170_MAC_INT_RETRY_FAIL;
1202
1203         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1204         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
1205 }
1206 #else
1207 static void wlan_mac_reset(void)
1208 {
1209         /* The driver takes care of reinitializing the device */
1210         BUG("MAC RESET");
1211 }
1212 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1213
1214 void __cold wlan_timer(void)
1215 {
1216         unsigned int cached_mac_reset;
1217
1218         cached_mac_reset = fw.wlan.mac_reset;
1219
1220         /* TX Queue Hang check */
1221         wlan_check_hang();
1222
1223         /* RX Overrun check */
1224         wlan_check_rx_overrun();
1225
1226         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1227                 wlan_mac_reset();
1228                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1229         } else {
1230                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1231                         fw.wlan.mac_reset--;
1232         }
1233 }