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 "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 /* This function will only work on uint32_t-aligned pointers! */
 230 static bool same_hdr(const void *_d0, const void *_d1)
 231 {
 232         const uint32_t *d0 = _d0;
 233         const uint32_t *d1 = _d1;
 234
 235         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 236         return !((d0[0] ^ d1[0]) |                      /* FC + DU */
 237                  (d0[1] ^ d1[1]) |                      /* addr1 */
 238                  (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) |    /* addr2 + addr3 */
 239                  (d0[4] ^ d1[4]));                      /* addr3 */
 240 }
 241
 242 static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b)
 243 {
 244         return (get_tid(a) == get_tid(b)) || same_hdr(a, b);
 245 }
 246
 247 static void wlan_tx_ampdu_end(unsigned int qidx)
 248 {
 249         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 250
 251         fw.wlan.ampdu_prev[qidx] = NULL;
 252         if (ht_prev)
 253                 ht_prev->f.hdr.mac.ba_end = 1;
 254 }
 255
 256 static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
 257 {
 258         unsigned int qidx = super->s.queue;
 259         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 260
 261         if (!super->f.hdr.mac.ampdu) {
 262                 wlan_tx_ampdu_end(qidx);
 263         } else {
 264                 fw.wlan.ampdu_prev[qidx] = super;
 265
 266                 if (ht_prev &&
 267                     !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e))
 268                         ht_prev->f.hdr.mac.ba_end = 1;
 269                 else
 270                         super->f.hdr.mac.ba_end = 0;
 271         }
 272 }
 273
 274 /* for all tries */
 275 static void __wlan_tx(struct dma_desc *desc)
 276 {
 277         struct carl9170_tx_superframe *super = get_super(desc);
 278
 279         if (unlikely(super->s.fill_in_tsf)) {
 280                 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
 281                 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
 282
 283                 /*
 284                  * Truth be told: this is a hack.
 285                  *
 286                  * The *real* TSF is definitely going to be higher/older.
 287                  * But this hardware emulation code is head and shoulders
 288                  * above anything a driver can possibly do.
 289                  *
 290                  * (even, if it's got an accurate atomic clock source).
 291                  */
 292
 293                 read_tsf(tsf);
 294         }
 295
 296         wlan_tx_ampdu(super);
 297
 298 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
 299         wlan_tx_complete(super, true);
 300         unhide_super(desc);
 301 # ifdef CONFIG_CARL9170FW_LOOPBACK
 302         dma_put(&fw.pta.up_queue, desc);
 303         up_trigger();
 304 # elif CONFIG_CARL9170FW_DISCARD
 305         dma_reclaim(&fw.pta.down_queue, desc);
 306         down_trigger();
 307 # endif
 308 #else /* CONFIG_CARL9170FW_LOOPBACK */
 309
 310 # if ((defined CONFIG_CARL9170FW_DEBUG) && (defined CONFIG_CARL9170FW_PSM))
 311         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 312 # endif /* CONFIG_CARL9170FW_DEBUG && CONFIG_CARL9170FW_PSM */
 313
 314         /* insert desc into the right queue */
 315         dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
 316 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 317 }
 318
 319 static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
 320 {
 321         hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
 322         hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
 323
 324         if (!(hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG)))
 325                 fw.wlan.sequence[vif] += 0x10;
 326 }
 327
 328 /* prepares frame for the first transmission */
 329 static void _wlan_tx(struct dma_desc *desc)
 330 {
 331         struct carl9170_tx_superframe *super = get_super(desc);
 332
 333         if (unlikely(super->s.assign_seq)) {
 334                 wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
 335         }
 336
 337         if (unlikely(super->s.ampdu_commit_density)) {
 338                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 339                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 340                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 341                             super->s.ampdu_density));
 342         }
 343
 344         if (unlikely(super->s.ampdu_commit_factor)) {
 345                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 346                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 347                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 348                             8 << super->s.ampdu_factor));
 349         }
 350
 351         __wlan_tx(desc);
 352 }
 353
 354 /* propagate transmission status back to the driver */
 355 static bool wlan_tx_status(struct dma_queue *queue,
 356                            struct dma_desc *desc)
 357 {
 358         struct ar9170_tx_frame *frame = DESC_PAYLOAD(desc);
 359         struct carl9170_tx_superframe *super = get_super(desc);
 360         struct ieee80211_hdr *hdr = &super->f.data.i3e;
 361         unsigned int qidx = super->s.queue;
 362         bool txfail, success;
 363
 364         success = true;
 365
 366         /* update hangcheck */
 367         fw.wlan.last_tx_desc_num[qidx] = 0;
 368
 369         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 370                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 371
 372                 /* reset retry indicator flags */
 373                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 374
 375                 if (wlan_tx_consume_retry(super)) {
 376                         /*
 377                          * retry for simple and aggregated 802.11 frames.
 378                          *
 379                          * Note: We must not mess up the original frame
 380                          * order.
 381                          */
 382
 383                         if (!frame->hdr.mac.ampdu) {
 384                                 /*
 385                                  * 802.11 - 7.1.3.1.5.
 386                                  * set "Retry Field" for consecutive attempts
 387                                  *
 388                                  * Note: For AMPDU see:
 389                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 390                                  */
 391
 392                                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
 393                         }
 394
 395                         if (txfail) {
 396                                 /* Normal TX Failure */
 397
 398                                 /* demise descriptor ownership back to the hardware */
 399                                 dma_rearm(desc);
 400
 401                                 /*
 402                                  * And this will get the queue going again.
 403                                  * To understand why: you have to get the HW
 404                                  * specs... But sadly I never saw them.
 405                                  */
 406                                 wlan_txunstuck(qidx);
 407
 408                                 /* abort cycle - this is necessary due to HW design */
 409                                 return false;
 410                         } else {
 411                                 /* (HT-) BlockACK failure */
 412
 413                                 /*
 414                                  * Unlink the failed attempt and put it into
 415                                  * the retry queue. The caller routine must
 416                                  * be aware of this so the frames don't get lost.
 417                                  */
 418
 419                                 dma_unlink_head(queue);
 420                                 dma_put(&fw.wlan.tx_retry, desc);
 421                                 return true;
 422                         }
 423                 } else {
 424                         /* out of frame attempts - discard frame */
 425                         success = false;
 426                 }
 427         }
 428
 429         dma_unlink_head(queue);
 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 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 443         if (unlikely(super == (void *) &dma_mem.reserved.ba)) {
 444                 fw.wlan.ba_desc = desc;
 445                 fw.wlan.ba_desc_available = 1;
 446                 return true;
 447         }
 448 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 449
 450         wlan_tx_complete(super, success);
 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         /* recycle freed descriptors */
 458         dma_reclaim(&fw.pta.down_queue, desc);
 459         down_trigger();
 460         return true;
 461 }
 462
 463 static void handle_tx_completion(void)
 464 {
 465         struct dma_desc *desc;
 466         unsigned int map = 0;
 467         int i;
 468
 469         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
 470                 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
 471                         if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
 472                                 /* termination requested. */
 473                                 break;
 474                         }
 475                 }
 476
 477                 for_each_desc(desc, &fw.wlan.tx_retry)
 478                         __wlan_tx(desc);
 479
 480                 wlan_tx_ampdu_end(i);
 481                 if (!queue_empty(&fw.wlan.tx_queue[i]))
 482                         map |= BIT(i);
 483
 484         }
 485         wlan_trigger(map);
 486 }
 487
 488 void __hot wlan_tx(struct dma_desc *desc)
 489 {
 490         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 491
 492         /* initialize rate control struct */
 493         super->s.rix = 0;
 494         super->s.cnt = 1;
 495         hide_super(desc);
 496
 497 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 498         if (unlikely(super->s.cab)) {
 499                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 500                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 501                 return;
 502         }
 503 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 504
 505         _wlan_tx(desc);
 506         wlan_trigger(BIT(super->s.queue));
 507 }
 508
 509 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 510 static void wlan_send_buffered_ba(void)
 511 {
 512         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 513         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 514         struct carl9170_bar_ctx *ctx;
 515
 516         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 517                 return;
 518
 519         /* there's no point to continue when the ba_desc is not available. */
 520         if (!fw.wlan.ba_desc_available)
 521                 return;
 522
 523         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 524         fw.wlan.ba_head_idx++;
 525
 526         /* Format BlockAck */
 527         fw.wlan.ba_desc->status = 0;
 528         fw.wlan.ba_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 529         fw.wlan.ba_desc_available = 0;
 530         fw.wlan.ba_desc->nextAddr = fw.wlan.ba_desc->lastAddr =
 531                 fw.wlan.ba_desc;
 532
 533         baf->s.len = fw.wlan.ba_desc->totalLen = fw.wlan.ba_desc->dataSize =
 534                 sizeof(struct carl9170_tx_superdesc) +
 535                 sizeof(struct ar9170_tx_hwdesc) +
 536                 sizeof(struct ieee80211_ba);
 537
 538         baf->s.ri[0].tries = 3;
 539         baf->s.queue = 0;
 540         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 541
 542         /* HW Duration / Backoff */
 543         baf->f.hdr.mac.backoff = 1;
 544         baf->f.hdr.mac.hw_duration = 1;
 545
 546         /* take the TX rate from the RX'd BAR */
 547         baf->f.hdr.phy.set = ctx->phy;
 548         baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 549
 550         /* format outgoing BA */
 551         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
 552         ba->duration = cpu_to_le16(0);
 553         memcpy(ba->ta, ctx->ta, 6);
 554         memcpy(ba->ra, ctx->ra, 6);
 555
 556         /*
 557          * Unfortunately, we cannot look into the hardware's scoreboard.
 558          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 559          * and send a null BlockAck.
 560          */
 561         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 562
 563         /*
 564          * NB:
 565          * not entirely sure if this is 100% correct?!
 566          */
 567         ba->control = ctx->control | cpu_to_le16(1);
 568         ba->start_seq_num = ctx->start_seq_num;
 569
 570         wlan_tx(fw.wlan.ba_desc);
 571 }
 572
 573 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 574 {
 575         struct carl9170_bar_ctx *tmp;
 576
 577         /* expire oldest entry, if we ran out of ba_ctx' */
 578         if (fw.wlan.ba_head_idx + CONFIG_CARL9170FW_BACK_REQS_NUM < fw.wlan.ba_tail_idx)
 579                 fw.wlan.ba_head_idx++;
 580
 581         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 582         fw.wlan.ba_tail_idx++;
 583
 584         return tmp;
 585 }
 586
 587 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 588                        unsigned int len, unsigned int mac_err)
 589 {
 590         struct ieee80211_bar *bar;
 591         struct carl9170_bar_ctx *ctx;
 592
 593         if (unlikely(mac_err)) {
 594                 /*
 595                  * This check does a number of things:
 596                  * 1. checks if the frame is in good nick
 597                  * 2. checks if the RA (MAC) matches
 598                  */
 599                 return ;
 600         }
 601
 602         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 603                 /*
 604                  * Sneaky, corrupted BARs... but not with us!
 605                  */
 606
 607                 return ;
 608         }
 609
 610         bar = (void *) hdr;
 611
 612         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 613             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 614                 /* not implemented yet */
 615
 616                 return ;
 617         }
 618
 619         ctx = wlan_get_bar_cache_buffer();
 620
 621         /* Brilliant! The BAR provides all necessary MACs! */
 622         memcpy(ctx->ra, bar->ta, 6);
 623         memcpy(ctx->ta, bar->ra, 6);
 624
 625         /*
 626          * NB:
 627          * not entirely sure if this is 100% correct to force the
 628          * imm ack bit or not...
 629          */
 630         ctx->control = bar->control | cpu_to_le16(1);
 631         ctx->start_seq_num = bar->start_seq_num;
 632         ctx->phy = ar9170_rx_to_phy(desc);
 633         if (unlikely(!ctx->phy)) {
 634                 /* provide a backup, in case ar9170_rx_to_phy fails */
 635                 ctx->phy = cpu_to_le32(0x2cc301);
 636         }
 637 }
 638 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 639
 640 static void wlan_check_rx_overrun(void)
 641 {
 642         uint32_t overruns, total;
 643
 644         fw.wlan.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 645         fw.wlan.rx_overruns += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 646         if (unlikely(overruns)) {
 647                 if (overruns == total) {
 648                         DBG("RX Overrun");
 649                         fw.wlan.mac_reset++;
 650                 }
 651
 652                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 653         }
 654 }
 655
 656 #ifdef CONFIG_CARL9170FW_WOL
 657
 658 #ifdef CONFIG_CARL9170FW_WOL_MAGIC_PACKET
 659 static bool wlan_rx_wol_magic_packet(struct ieee80211_hdr *hdr, unsigned int len)
 660 {
 661         const unsigned char *data, *end, *mac;
 662         unsigned int found = 0;
 663
 664         /*
 665          * LIMITATION:
 666          * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
 667          * for MAGIC patterns!
 668          */
 669
 670         /*
 671          * TODO:
 672          * Currently, the MAGIC MAC Address is fixed to the EEPROM default.
 673          * It's possible to make it fully configurable, e.g:
 674          *
 675          * mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
 676          * But this will clash with the driver's suspend path, because it
 677          * needs to reset the registers.
 678          */
 679         mac = rom.sys.mac_address;
 680
 681         data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
 682         end = (u8 *)((unsigned long)hdr + len);
 683
 684         /*
 685          * scan for standard WOL Magic frame
 686          *
 687          * "A physical WakeOnLAN (Magic Packet) will look like this:
 688          * ---------------------------------------------------------------
 689          * | Synchronization Stream |  Target MAC |  Password (optional) |
 690          * |    6 octets            |   96 octets |   0, 4 or 6          |
 691          * ---------------------------------------------------------------
 692          *
 693          * The Synchronization Stream is defined as 6 bytes of FFh.
 694          * The Target MAC block contains 16 duplications of the IEEEaddress
 695          * of the target, with no breaks or interruptions.
 696          *
 697          * The Password field is optional, but if present, contains either
 698          * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
 699          * dissect the password, if present, according to the command-line
 700          * format that ether-wake uses, therefore, if a 4-byte password is
 701          * present, it will be dissected as an IPv4 address and if a 6-byte
 702          * password is present, it will be dissected as an Ethernet address.
 703          *
 704          * <http://wiki.wireshark.org/WakeOnLAN>
 705          */
 706
 707         while (data < end) {
 708                 if (found >= 6) {
 709                         if (*data == mac[found % 6])
 710                                 found++;
 711                         else
 712                                 found = 0;
 713                 }
 714
 715                 /* previous check might reset found counter */
 716                 if (found < 6) {
 717                         if (*data == 0xff)
 718                                 found++;
 719                         else
 720                                 found = 0;
 721                 }
 722
 723                 if (found == (6 + 16 * 6)) {
 724                         return true;
 725                 }
 726
 727                 data++;
 728         }
 729
 730         return false;
 731 }
 732 #endif /* CONFIG_CARL9170FW_WOL_MAGIC_PACKET */
 733
 734 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 735
 736 /*
 737  * Note: CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID is not a real
 738  * string. We have to be careful not to add a \0 at the end.
 739  */
 740 static const struct {
 741         u8 ssid_ie;
 742         u8 ssid_len;
 743         u8 ssid[sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1];
 744 } __packed probe_req = {
 745         .ssid_ie = WLAN_EID_SSID,
 746         .ssid_len = sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1,
 747         .ssid = CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID,
 748 };
 749
 750 static bool wlan_rx_wol_probe_ssid(struct ieee80211_hdr *hdr, unsigned int len)
 751 {
 752         const unsigned char *data, *end, *scan = (void *) &probe_req;
 753
 754         /*
 755          * IEEE 802.11-2007 7.3.2.1 specifies that the SSID is no
 756          * longer than 32 octets.
 757          */
 758         BUILD_BUG_ON((sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1) > 32);
 759
 760         if (ieee80211_is_probe_req(hdr->frame_control)) {
 761                 unsigned int i;
 762                 end = (u8 *)((unsigned long)hdr + len);
 763
 764                 /*
 765                  * The position of the SSID information element inside
 766                  * a probe request frame is more or less "fixed".
 767                  */
 768                 data = (u8 *)((struct ieee80211_mgmt *)hdr)->u.probe_req.variable;
 769                 for (i = 0; i < (unsigned int)(probe_req.ssid_len + 1); i++) {
 770                         if (scan[i] != data[i])
 771                                 return false;
 772                 }
 773
 774                 return true;
 775         }
 776
 777         return false;
 778 }
 779 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 780
 781 static void wlan_rx_wol(unsigned int rx_filter __unused, struct ieee80211_hdr *hdr __unused, unsigned int len __unused)
 782 {
 783         bool __unused wake_up = false;
 784
 785 #ifdef CONFIG_CARL9170FW_WOL_MAGIC_PACKET
 786         if (rx_filter & CARL9170_RX_FILTER_DATA)
 787                 wake_up |= wlan_rx_wol_magic_packet(hdr, len);
 788 #endif /* CONFIG_CARL9170FW_WOL_MAGIC_PACKET */
 789
 790 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 791         if (rx_filter & CARL9170_RX_FILTER_MGMT)
 792                 wake_up |= wlan_rx_wol_probe_ssid(hdr, len);
 793 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 794
 795         if (wake_up) {
 796                 fw.suspend_mode = CARL9170_AWAKE_HOST;
 797                 set(AR9170_USB_REG_WAKE_UP, AR9170_USB_WAKE_UP_WAKE);
 798         }
 799 }
 800 #endif /* CONFIG_CARL9170FW_WOL */
 801
 802 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 803 {
 804         struct ieee80211_hdr *hdr;
 805         unsigned int data_len;
 806         unsigned int rx_filter;
 807         unsigned int mac_err;
 808
 809         data_len = ar9170_get_rx_mpdu_len(desc);
 810         mac_err = ar9170_get_rx_macstatus_error(desc);
 811
 812 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 813
 814         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 815             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 816             mac_err & AR9170_RX_ERROR_BAD) {
 817                 /*
 818                  * This frame is too damaged to do anything
 819                  * useful with it.
 820                  */
 821
 822                 return CARL9170_RX_FILTER_BAD;
 823         }
 824
 825         rx_filter = 0;
 826         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 827                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 828
 829         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 830                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 831
 832         hdr = ar9170_get_rx_i3e(desc);
 833         if (likely(ieee80211_is_data(hdr->frame_control))) {
 834                 rx_filter |= CARL9170_RX_FILTER_DATA;
 835         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 836                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 837                 case IEEE80211_STYPE_BACK_REQ:
 838 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 839                         handle_bar(desc, hdr, data_len, mac_err);
 840 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 841                         /* fallthrough */
 842                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 843                         break;
 844                 case IEEE80211_STYPE_PSPOLL:
 845                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 846                         break;
 847                 default:
 848                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 849                         break;
 850                 }
 851         } else {
 852                 /* ieee80211_is_mgmt */
 853                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 854         }
 855
 856 #ifdef CONFIG_CARL9170FW_WOL
 857         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 858                 wlan_rx_wol(rx_filter, hdr, min(data_len,
 859                             (unsigned int)AR9170_BLOCK_SIZE));
 860         }
 861 #endif /* CONFIG_CARL9170FW_WOL */
 862
 863 #undef AR9170_RX_ERROR_BAD
 864
 865         return rx_filter;
 866 }
 867
 868 static void handle_rx(void)
 869 {
 870         struct dma_desc *desc;
 871
 872         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 873                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 874                         dma_put(&fw.pta.up_queue, desc);
 875                         up_trigger();
 876                 } else {
 877                         dma_reclaim(&fw.wlan.rx_queue, desc);
 878                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 879                 }
 880         }
 881 }
 882
 883 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 884 void wlan_cab_flush_queue(const unsigned int vif)
 885 {
 886         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 887         struct dma_desc *desc;
 888
 889         /* move queued frames into the main tx queues */
 890         for_each_desc(desc, cab_queue) {
 891                 struct carl9170_tx_superframe *super = get_super(desc);
 892                 if (!queue_empty(cab_queue)) {
 893                         /*
 894                          * Set MOREDATA flag for all,
 895                          * but the last queued frame.
 896                          * see: 802.11-2007 11.2.1.5 f)
 897                          *
 898                          * This is actually the reason to why
 899                          * we need to prevent the reentry.
 900                          */
 901
 902                         super->f.data.i3e.frame_control |=
 903                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 904                 } else {
 905                         super->f.data.i3e.frame_control &=
 906                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 907                 }
 908
 909                 /* ready to roll! */
 910                 _wlan_tx(desc);
 911                 wlan_trigger(BIT(super->s.queue));
 912         }
 913 }
 914
 915 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 916                                const unsigned int len)
 917 {
 918         struct ieee80211_mgmt *mgmt = addr;
 919         uint8_t *pos, *end;
 920
 921         pos = mgmt->u.beacon.variable;
 922         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 923         while (pos < end) {
 924                 if (pos + 2 + pos[1] > end)
 925                         return NULL;
 926
 927                 if (pos[0] == ie)
 928                         return pos;
 929
 930                 pos += pos[1] + 2;
 931         }
 932
 933         return NULL;
 934 }
 935
 936 void wlan_modify_beacon(const unsigned int vif,
 937         const unsigned int addr, const unsigned int len)
 938 {
 939         uint8_t *_ie;
 940         struct ieee80211_tim_ie *ie;
 941
 942         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 943         if (likely(_ie)) {
 944                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 945
 946                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 947                         /* schedule DTIM transfer */
 948                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 949                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 950                         /* undo all chances to the beacon structure */
 951                         ie->bitmap_ctrl &= ~0x1;
 952                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 953                 }
 954
 955                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 956                 if (fw.wlan.cab_flush_trigger[vif]) {
 957                         /* Set the almighty Multicast Traffic Indication Bit. */
 958                         ie->bitmap_ctrl |= 0x1;
 959                 }
 960         }
 961
 962         /*
 963          * Ideally, the sequence number should be assigned by the TX arbiter
 964          * hardware. But AFAIK that's not possible, so we have to go for the
 965          * next best thing and write it into the beacon fifo during the open
 966          * beacon update window.
 967          */
 968
 969         wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
 970 }
 971 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 972
 973 static void handle_beacon_config(void)
 974 {
 975         uint32_t bcn_count;
 976
 977         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 978         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 979                          (uint8_t *) &bcn_count);
 980 }
 981
 982 static void handle_pretbtt(void)
 983 {
 984 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 985         fw.wlan.cab_flush_time = get_clock_counter();
 986 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 987
 988 #ifdef CONFIG_CARL9170FW_PSM
 989         rf_psm();
 990
 991         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 992                          (uint8_t *) &fw.phy.psm.state);
 993 #else
 994         send_cmd_to_host(0, CARL9170_RSP_PRETBTT, 0x00, NULL);
 995 #endif /* CONFIG_CARL9170FW_PSM */
 996 }
 997
 998 static void handle_atim(void)
 999 {
1000         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
1001 }
1002
1003 #ifdef CONFIG_CARL9170FW_DEBUG
1004 static void handle_qos(void)
1005 {
1006         /*
1007          * What is the QoS Bit used for?
1008          * Is it only an indicator for TXOP & Burst, or
1009          * should we do something here?
1010          */
1011 }
1012
1013 static void handle_radar(void)
1014 {
1015         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
1016 }
1017 #endif /* CONFIG_CARL9170FW_DEBUG */
1018
1019 static void wlan_janitor(void)
1020 {
1021 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
1022         unsigned int i;
1023
1024         for (i = 0; i < CARL9170_INTF_NUM; i++) {
1025                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
1026                         /*
1027                          * This is hardcoded into carl9170usb driver.
1028                          *
1029                          * The driver must set the PRETBTT event to beacon_interval -
1030                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
1031                          *
1032                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
1033                          * 11.2.1.6. Let's hope the current solution is adequate enough.
1034                          */
1035
1036                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
1037                                 wlan_cab_flush_queue(i);
1038
1039                                 /*
1040                                  * This prevents the code from sending new BC/MC frames
1041                                  * which were queued after the previous buffered traffic
1042                                  * has been sent out... They will have to wait until the
1043                                  * next DTIM beacon comes along.
1044                                  */
1045                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
1046                         }
1047                 }
1048
1049         }
1050 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
1051
1052         wlan_send_buffered_tx_status();
1053
1054 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
1055         wlan_send_buffered_ba();
1056 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
1057 }
1058
1059 void handle_wlan(void)
1060 {
1061         uint32_t intr;
1062
1063         intr = get(AR9170_MAC_REG_INT_CTRL);
1064         /* ACK Interrupt */
1065         set(AR9170_MAC_REG_INT_CTRL, intr);
1066
1067 #define HANDLER(intr, flag, func)                       \
1068         do {                                            \
1069                 if ((intr & flag) != 0) {               \
1070                         func();                         \
1071                 }                                       \
1072         } while (0)
1073
1074         intr |= fw.wlan.soft_int;
1075         fw.wlan.soft_int = 0;
1076
1077         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
1078
1079         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
1080
1081         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
1082
1083         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
1084                 handle_tx_completion);
1085
1086 #ifdef CONFIG_CARL9170FW_DEBUG
1087         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
1088
1089         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
1090 #endif /* CONFIG_CARL9170FW_DEBUG */
1091
1092         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
1093
1094         if (unlikely(intr))
1095                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
1096
1097         wlan_janitor();
1098
1099 #undef HANDLER
1100 }
1101
1102 static void wlan_check_hang(void)
1103 {
1104         struct dma_desc *desc;
1105         unsigned int i;
1106
1107         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1108                 if (queue_empty(&fw.wlan.tx_queue[i])) {
1109                         /* Nothing to do here... move along */
1110                         continue;
1111                 }
1112
1113                 /* fetch the current DMA queue position */
1114                 desc = get_wlan_txq_addr(i);
1115
1116                 /* Stuck frame detection */
1117                 if (unlikely(desc == fw.wlan.last_tx_desc[i])) {
1118                         fw.wlan.last_tx_desc_num[i]++;
1119
1120                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 6)) {
1121                                 /*
1122                                  * schedule MAC reset (aka OFF/ON => dead)
1123                                  *
1124                                  * This will almost certainly kill
1125                                  * the device for good, but it's the
1126                                  * recommended thing to do...
1127                                  */
1128
1129                                 fw.wlan.mac_reset++;
1130                         }
1131
1132 #ifdef CONFIG_CARL9170FW_DEBUG
1133                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 5)) {
1134                                 /*
1135                                  * Sigh, the queue is almost certainly
1136                                  * dead. Dump the queue content to the
1137                                  * user, maybe we find out why it got
1138                                  * so stuck.
1139                                  */
1140
1141                                 wlan_dump_queue(i);
1142                         }
1143 #endif /* CONFIG_CARL9170FW_DEBUG */
1144
1145 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1146                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 3)) {
1147                                 /*
1148                                  * Hrrm, bump the queue a bit.
1149                                  * maybe this will get it going again.
1150                                  */
1151
1152                                 wlan_dma_bump(i);
1153                                 wlan_trigger(BIT(i));
1154                         }
1155 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1156                 } else {
1157                         /* Nothing stuck */
1158                         fw.wlan.last_tx_desc[i] = desc;
1159                         fw.wlan.last_tx_desc_num[i] = 0;
1160                 }
1161         }
1162 }
1163
1164 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1165 /*
1166  * NB: Resetting the MAC is a two-edged sword.
1167  * On most occasions, it does what it is supposed to do.
1168  * But there is a chance that this will make it
1169  * even worse and the radio dies silently.
1170  */
1171 static void wlan_mac_reset(void)
1172 {
1173         uint32_t val;
1174         uint32_t agg_wait_counter;
1175         uint32_t agg_density;
1176         uint32_t bcn_start_addr;
1177         uint32_t rctl, rcth;
1178         uint32_t cam_mode;
1179         uint32_t ack_power;
1180         uint32_t rts_cts_tpc;
1181         uint32_t rts_cts_rate;
1182         unsigned int i;
1183
1184 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1185         uint32_t rx_BB;
1186 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1187
1188         INFO("MAC RESET");
1189
1190         /* Save aggregation parameters */
1191         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1192         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1193
1194         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1195
1196         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1197         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1198         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1199
1200         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1201         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1202         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1203
1204 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1205         /* 0x1c8960 write only */
1206         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1207 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1208
1209         /* TX/RX must be stopped by now */
1210         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1211
1212         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1213
1214         /*
1215          * Manipulate CCA threshold to stop transmission
1216          *
1217          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1218          */
1219
1220         /*
1221          * check Rx state in 0(idle) 9(disable)
1222          *
1223          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1224          * while( (chState != 0) && (chState != 9)) {
1225          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1226          * }
1227          */
1228
1229         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1230
1231         delay(2);
1232
1233         /* Restore aggregation parameters */
1234         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1235         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1236
1237         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1238         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1239         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1240         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1241
1242         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1243         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1244         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1245
1246 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1247         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1248 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1249
1250         /*
1251          * Manipulate CCA threshold to resume transmission
1252          *
1253          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1254          */
1255
1256         val = AR9170_DMA_TRIGGER_RXQ;
1257         /* Reinitialize all WLAN TX DMA queues. */
1258         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1259                 struct dma_desc *iter;
1260
1261                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1262
1263                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1264                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1265                         val |= BIT(i);
1266
1267                 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]),
1268                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1269                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1270         }
1271
1272         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1273                             AR9170_MAC_INT_RETRY_FAIL;
1274
1275         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1276         wlan_trigger(val);
1277 }
1278 #else
1279 static void wlan_mac_reset(void)
1280 {
1281         /* The driver takes care of reinitializing the device */
1282         BUG("MAC RESET");
1283 }
1284 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1285
1286 void __cold wlan_timer(void)
1287 {
1288         unsigned int cached_mac_reset;
1289
1290         cached_mac_reset = fw.wlan.mac_reset;
1291
1292         /* TX Queue Hang check */
1293         wlan_check_hang();
1294
1295         /* RX Overrun check */
1296         wlan_check_rx_overrun();
1297
1298         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1299                 wlan_mac_reset();
1300                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1301         } else {
1302                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1303                         fw.wlan.mac_reset--;
1304         }
1305 }